DESC:TECHNICAL FIELD

The present disclosure relates to a gas supply pipeline fuel supply assembly, and particularly, to a fuel supply assembly for the safe transmission of a mixture of natural gas and hydrogen gas.

BACKGROUND

Domestic cooking gas supply pipeline is employed to deliver cooking gas for residential use. The cooking gas may include liquified petroleum gas (LPG) or natural gas in residential areas for cooking and heating purposes. Recently, natural gas is supplemented with hydrogen gas to form a hydrogen-enriched natural gas which may be known as a mixture-based cooking gas having a higher calorific value that reduces the emission of the carbon oxides and nitrogen oxides. Generally, up to 20% of Hydrogen gas is added to natural gas by volume. The mixture-based cooking gas is generally supplied to every floor in a high rise building for cooking and heating purposes.

There are various limitations with the supply of the mixture of the cooking gas in some scenarios, such as in the high-rise building. One of the issues is separation of hydrogen and natural gas that occurs due to density differences in a vertical pipeline. The separation happens in different scenarios which includes the non-usage of the stove on different floors and also the ambient temperature. Natural gas is 8 times denser than hydrogen, and as a result, Hydrogen gas accumulates in the top portion of the vertical pipeline and the bottom portion consists of methane. As a result, at the consumer's end, i.e., the stove, the flame meets the pure hydrogen gas initially which causes the flashback to occur due to high flame speed of hydrogen gas. The addition of hydrogen to natural gas increases the chances of a flashback or a blowout as hydrogen is a flammable gas.

Accordingly, there remains a need for a technique to prevent such incidents and thus promote the blending of hydrogen and natural gas at different levels in the high-rise residential buildings.

SUMMARY

This summary is provided to introduce a selection of concepts, in a simplified format, that are further described in the detailed description of the invention. This summary is neither intended to identify key or essential inventive concepts of the invention nor intended to determine the scope of the invention.

The present disclosure discloses a fuel supply assembly adapted to supply a fuel mixture. The fuel supply assembly includes a feed line, a replenishment tank, and an outlet. The feed line adapted to receive the fuel mixture of a pair of gaseous fuels having a first ratio of mixing. The replenishment tank fluidically coupled to the feed line the fuel mixture having a second ratio of mixing, wherein the replenishment tank is adapted to add a gas of the pair gases to restore the first ratio from the second ratio. The outlet disposed downstream to the replenishment tank and adapted to supply the fuel mixture with the fuel mixture with the restored first ratio.

The present disclosure discloses a fuel blending assembly adapted to supply a fuel mixture having a pair of gaseous fuels having a first ratio of mixing to a fuel supply assembly, the fuel blending assembly. the fuel blending assembly includes a Gaseous Hydrogen (GH2) tank, a metering and flow control (MFC) unit, a feed line, a static mixer, an analyzer, and a control unit. The GH2 tank is adapted to supply the GH2 at a first predetermined pressure. Further, the MFC unit is disposed downstream to the GH2 tank and adapted to control a pressure and a flow rate of the GH2. Moreover, the feed line is adapted to supply Natural Gas at a second predetermined pressure. The static mixer having a first inlet adapted to receive the GH2, a second inlet adapted to receive the GH2 from the MFC unit, and an outlet adapted to mix the GH2 and the NG to form a fuel mixture having the pair of GH2 and NG at a first ratio. Further, the analyzer is fluidically coupled to an outlet of the static mixture and adapted generate a signal corresponding to an instantaneous ratio of the GH2 and the NG in the fuel mixture. Moreover, the control unit communicatively coupled to the analyzer and MFC unit. Furthermore, the control unit is adapted to compare the instantaneous ratio with the first ratio to determine a difference therebetween; and operate the MFC unit to vary flow rate of the GH2 in accordance with the determined difference.

The present disclosure enables various technical advancements such as preventing flashbacks and blowouts while lighting the stove. Further, the present disclosure facilitates the blending of hydrogen and natural gas. Moreover, the present disclosure is used to analyse the process and the flow condition at different gas mixture compositions in order to determine the composition required for smooth functioning and blending of hydrogen with natural gas.

To further clarify the advantages and features of the present disclosure, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which are illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail in the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:

Figure 1 illustrates a schematic view of a fuel supply assembly of a gas supply pipeline with a gas seal of a high-rise building, in accordance with an embodiment of the present disclosure;

Figure 2 illustrates a schematic view of a fuel supply assembly of a gas supply pipeline along with a gas seal and an inert addition of a high-rise building, in accordance with an embodiment of the present disclosure;

Figure 3 illustrates a schematic view of a fuel supply assembly of a gas supply pipeline along with a gas seal and methane addition of a high-rise building, in accordance with an embodiment of the present disclosure;

Figure 4 illustrates a schematic view of a fuel supply assembly of a gas supply pipeline along with inert gas/methane addition without a gas seal of a high-rise building, in accordance with an embodiment of the present disclosure;

Figure 5 illustrates a schematic view of a stove with in-built mixing optimization, in accordance with an embodiment of the present disclosure; and

Figure 6 illustrates a schematic of a fuel supply assembly of blending Gaseous Hydrogen and Natural Gas, in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION OF FIGURES

For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated fuel supply assembly, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skilled in the art to which this invention belongs. The fuel supply assembly, methods, and examples provided herein are illustrative only and not intended to be limiting.

The term “some” as used herein is defined as “none, or one, or more than one, or all.” Accordingly, the terms “none,” “one,” “more than one,” “more than one, but not all” or “all” would all fall under the definition of “some.” The term “some embodiments” may refer to no embodiments or to one embodiment or to several embodiments or to all embodiments. Accordingly, the term “some embodiments” is defined as meaning “no embodiment, or one embodiment, or more than one embodiment, or all embodiments.”

The terminology and structure employed herein are for describing, teaching and illuminating some embodiments and their specific features and elements and do not limit, restrict or reduce the spirit and scope of the claims or their equivalents.

More specifically, any terms used herein such as but not limited to “includes,” “comprises,” “has,” “consists,” and grammatical variants thereof do NOT specify an exact limitation or restriction and certainly do NOT exclude the possible addition of one or more features or elements, unless otherwise stated, and furthermore must NOT be taken to exclude the possible removal of one or more of the listed features and elements, unless otherwise stated with the limiting language “MUST comprise” or “NEEDS TO include.”

Whether or not a certain feature or element was limited to being used only once, either way, it may still be referred to as “one or more features” “one or more elements” “at least one feature” or “at least one element.” Furthermore, the use of the terms “one or more” or “at least one” feature or element does NOT preclude there being none of that feature or element, unless otherwise specified by limiting language such as “there NEEDS to be one or more . . . ” or “one or more element is REQUIRED.”

Unless otherwise defined, all terms, and especially any technical and/or scientific terms, used herein may be taken to have the same meaning as commonly understood by one having an ordinary skill in the art.

Reference is made herein to some “embodiments.” It should be understood that an embodiment is an example of a possible implementation of any features and/or elements presented in the attached claims. Some embodiments have been described for the purpose of illuminating one or more of the potential ways in which the specific features and/or elements of the attached claims fulfil the requirements of uniqueness, utility, and non-obviousness.

Use of the phrases and/or terms such as but not limited to “a first embodiment,” “a further embodiment,” “an alternate embodiment,” “one embodiment,” “an embodiment,” “multiple embodiments,” “some embodiments,” “other embodiments,” “a further embodiment”, “furthermore embodiment”, “additional embodiment” or variants thereof do NOT necessarily refer to the same embodiments. Unless otherwise specified, one or more particular features and/or elements described in connection with one or more embodiments may be found in one embodiment or may be found in more than one embodiment, or may be found in all embodiments, or may be found in no embodiments. Although one or more features and/or elements may be described herein in the context of only a single embodiment, or alternatively in the context of more than one embodiment, or further alternatively in the context of all embodiments, the features and/or elements may instead be provided separately or in any appropriate combination or not at all. Conversely, any feature and/or element described in the context of separate embodiments may alternatively be realized as existing together in the context of a single embodiment.

Any particular and all details set forth herein are used in the context of some embodiments and therefore should NOT be necessarily taken as limiting factors to the attached claims. The attached claims and their legal equivalents can be realized in the context of embodiments other than the ones used as illustrative examples in the description below.

Embodiments of the present disclosure will be described below in detail with reference to the accompanying drawings.

Further, skilled artisans will appreciate those elements in the drawings are illustrated for simplicity and may not have necessarily been drawn to scale. For example, the flow charts illustrate the method in terms of the most prominent steps involved to help to improve understanding of aspects of the present disclosure. Furthermore, in terms of the construction of the device, one or more components of the device may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding the embodiments of the present disclosure so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.

Figure 1 illustrates a schematic view of a fuel supply assembly 100 of a gas supply pipeline with a gas seal of a high-rise building, in accordance with an embodiment of the present disclosure. The fuel supply assembly 100 depicts an approach that uses a gas seal to avoid flashback of hydrogen during cooking in a high-rise building. The fuel supply assembly 100 may include but is not limited to a gas station 102, a replenishment tank 104, a spiral pipe 106, a pipeline 108, a feed line 110, and an outlet 112.

The gas station 102 is used for storage of a fuel mixture of a plurality of cooking gases (e.g., natural gas, i.e. methane and hydrogen). The feed line 110 is adapted to receive the fuel mixture of a pair of gaseous fuels having a first ratio of mixing. Further, the feed line 110 is used for the transportation of the fuel mixture stored in the gas station 102 to the spiral pipe 106 which may be a part of the feed line 110. While the transportation takes place from the gas station 102 to the spiral pipe 106 using the feed line 110, Hydrogen and Natural Gas remains in mixed state. However, When the fuel supply assembly 300 is not in use, natural gas may be stagnant within the feed line 210. The stagnancy of natural gas within the feed line 210 may cause stratification of hydrogen from natural gas due to the difference in densities. As a result, Hydrogen gas may rise after a period of time defined as “t” and hence, the fuel mixture received at the spiral pipe 106 is predominantly hydrogen-based. Moreover, the spiral pipe 106 is used to trap and seal the gas received.

The replenishment tank 104 may be fluidically coupled to the feed line 110 with the fuel mixture having a second ratio of mixing. The replenishment tank 104 is adapted to add a gas of the pair gases to restore the first ratio from the second ratio. Further, the replenishment tank 104 may hold natural gas, which replenishes natural gas in the stream exiting in the spiral pipe 106. During the aforementioned operation, the spiral pipe 106 releases the sealed hydrogen through the pipeline 108 into the replenishment tank 104, thus replenishing natural gas amount in the sealed hydrogen. A final mixture from the replenishment tank 104 is sent to the stoves, on different floors of the high-rise building through the outlet 112. The outlet 112 may be disposed downstream to the replenishment tank 104 and is adapted to supply the fuel mixture with the restored first ratio.

Figure 2 illustrates a schematic view of a fuel supply assembly 200 of a gas supply pipeline along with a gas seal and an inert addition of a high-rise building, in accordance with an embodiment of the present disclosure. In the illustrated approach, the feed of cooking gas is further enhanced with an inert gas that reduces the flashback. The fuel supply assembly 200 depicts an approach that uses a gas seal along with an inert addition to avoid flashback of hydrogen during cooking in a high-rise building. The fuel supply assembly 200 may include but is not limited to a gas station 202, a replenishment tank 204, a spiral pipe 206, an outlet 208, a feed line 210, a second tank 212, a second inlet 214, a second mixing junction 216, a first mixing junction valve 218 and a second mixing junction valve 220.

The gas station 202 is used for storage of the fuel mixture of a plurality of cooking gases. The feed line 210 is used for the transportation of the fuel mixture stored in the gas station 202 to the spiral pipe 206. While the transportation takes place from the gas station 202 to the spiral pipe 206 using the feed line 210, due to a difference in density of hydrogen and natural gas. hydrogen gas is adapted to rises after a period of time. When the fuel supply assembly 300 is not in use, natural gas may be stagnant within the feed line 210. The stagnancy of natural gas within the feed line 210 may cause stratification of hydrogen from natural gas due to the difference in densities. Hence, the fuel mixture received at the spiral pipe 206 is predominantly hydrogen-based. Moreover, the spiral pipe 206 is used to trap and seal the gas received.

Further, the second tank 212 is adapted to hold a flame suppressing gas, which may be a less reactive gas such as an inert gas or nitrogen, which is used to reduce flashbacks is stored in the second tank 212 and the supply of the inert is controlled using the first mixing junction valve 218. The first mixing junction valve 218 is adapted to mix the fuel mixture having the second ratio of mixing. The first mixing junction may include but is not limited to a first inlet, a second inlet 214, and an outlet 208. The first inlet may be fluidically coupled to the second tank 212. Further, the second inlet 214 may be fluidically coupled to the feed line 210 and is adapted to receive the fuel mixture having the second ratio of mixing. Moreover, the outlet 208 is disposed upstream to the replenishment tank 204 and adapted to supply the fuel mixture having the second ratio and mixed with the flame suppressing gas to the replenishment tank 304. The inert and the sealed hydrogen from the second tank 212 and the spiral pipe 206 respectively are combined at the second inlet 214. The mixed gases released from the second inlet 214 are sent through the outlet 208 into the replenishment tank 204, thus replenishing natural gas amount in the mixed gases. A final mixture from the replenishment tank 204 is sent to the stoves on different floors of the high-rise building.

The gas station 202 is used for storage of the fuel mixture of a plurality of cooking gases. The feed line 210 is used for the transportation of the fuel mixture stored in the gas station 202 to the spiral pipe 206. While the transportation takes place from the gas station 202 to the spiral pipe 206 using the feed line 210, due to a difference in density of hydrogen and natural gas, hydrogen rises after a period of time. When the fuel supply assembly 300 is not in use, natural gas may be stagnant within the feed line 210. The stagnancy of natural gas within the feed line 210 may cause stratification of hydrogen from natural gas due to the difference in densities. Moreover, the spiral pipe 206 is used to trap and seal the gas received. Further, an inert (e.g. nitrogen gas) is stored in the second tank 212 and the supply of the inert into the fuel supply assembly 200 is established via the second mixing junction 216 and is controlled using the second mixing junction valve 220.

The second mixing junction valve 220 may be disposed downstream to the replenishment tank 204 and upstream to a stove and is adapted to mix additional flame suppressing gas to the fuel mixture with restored first mixture. The spiral pipe 206 releases the sealed hydrogen through the outlet 208 into the replenishment tank 204, thus replenishing natural gas amount in the sealed hydrogen. The mixed gases released from the replenishment tank 204 are further mixed with the inert at the second mixing junction 216, thus creating a final mixture. The final mixture from the second mixing junction 216 is sent to the stoves on different floors of the high-rise building.

Figure 3 illustrates a schematic view of a fuel supply assembly 300 of a gas supply pipeline along with a gas seal and methane addition of a high-rise building, in accordance with an embodiment of the present disclosure. The fuel supply assembly 300 depicts an approach that uses a gas seal along with a methane addition to avoid flashbacks of hydrogen during cooking in a high-rise building. The fuel supply assembly 300 may include but is not limited to a gas station 302, a replenishment tank 304, a spiral pipe 306, an outlet 308, a feed line 310, a second tank 312, a second inlet 314, a first mixing junction valve 316, and a second valve 318.

The gas station 302 is used for storage of the fuel mixture of a plurality of cooking gases. The feed line 310 is used for the transportation of the fuel mixture stored in the gas station 302 to the spiral pipe 306. Further, due to a difference in density of hydrogen and natural gas, during transportation, hydrogen rises after a period of time. When the fuel supply assembly 300 is not in use, natural gas may be stagnant within the feed line 310. The stagnancy of natural gas within the feed line 310 may cause stratification of hydrogen from natural gas due to the difference in densities. Hence, the fuel mixture received at the spiral pipe 306 is predominantly hydrogen-based. Moreover, the spiral pipe 306 is used to trap and seal the gas received.

Further, the second tank 312 is adapted to hold a flame suppressing gas which may be methane, and the supply of the methane to the second inlet 314 is controlled using the first mixing junction valve 316. The first mixing junction valve 316 is adapted to mix the fuel mixture having the second ratio of mixing. The first mixing junction valve 316 may include but is not limited to a first inlet, the second inlet 314, and the outlet 308. The first inlet may be fluidically coupled to the second tank 312. Further, the second inlet 314 may be fluidically coupled to the feed line 310 and is adapted to receive the fuel mixture having the second ratio of mixing. Moreover, the outlet 308 is disposed upstream to the replenishment tank 304 and adapted to supply the fuel mixture having the second ratio and mixed with the flame suppressing gas to the replenishment tank 304. In order to add methane to hydrogen at the second inlet 314, the flow rate of the sealed hydrogen is controlled using the second valve 318.

The flow rate of hydrogen from the spiral pipe 306 is controlled in order to regulate the outlet mass flow rate. In case, the flow rate of hydrogen is not controlled, the outlet mass flow rate of the fuel mixture may increase due to the addition of methane which may lead to an increased flame height or a blow-up explosion. The methane and the sealed hydrogen from the second tank 312 and the spiral pipe 306 respectively are combined at the second inlet 314. The mixed gases released from the second inlet 314 are sent through the outlet 308 into the replenishment tank 304, thus replenishing natural gas amount in the mixed gases. A final mixture from the replenishment tank 304 is sent to the stoves on different floors of the high-rise building.

Figure 4 illustrates a schematic view of a fuel supply assembly 400 of a gas supply pipeline along with inert/methane addition without a gas seal of a high-rise building, in accordance with an embodiment of the present disclosure. The fuel supply assembly 400 depicts an approach that uses an inert/methane addition without using a gas seal to avoid flashback of hydrogen during cooking in a high-rise building. The fuel supply assembly 400 may include but is not limited to a gas station 402, a replenishment tank 406, a feed line 404, and a mixing junction 408, a first inlet 410, a second inlet 412, and an outlet 414. The gas station 402 is used for storage of the fuel mixture of a plurality of cooking gases. The feed line 404 is used for the transportation of the fuel mixture stored in the gas station 402 to the mixing junction 408. While the transportation takes place from the gas station 402 to the mixing junction 408 using the feed line 404, due to a difference in density of hydrogen and natural gas, hydrogen rises after a period of time. Hence, the fuel mixture received at the mixing junction 408 is predominantly hydrogen-based. The inert/second tank 406 releases a gas (either nitrogen or methane) to the mixing junction 408, a final mixture is formed. The final mixture from the mixing junction 408 is sent to the stoves on different floors of the high-rise building. The first inlet 410 is fluidically coupled to the replenishment tank 406 and is adapted to receive another fuel mixture of a gas of the pair of gases and a flame suppressing gas. Further, the second inlet 412 fluidically coupled to the feed line 404 and is adapted to receive the fuel mixture having the second ratio of mixing. Moreover, the outlet 414 is disposed upstream to the replenishment tank 406 and is adapted to supply the fuel mixture having the first ratio and mixed with the flame suppressing gas.

Figure 5 illustrates a schematic view of a stove 500 with in-built mixing optimization, in accordance with an embodiment of the present disclosure. structure of the stove 500 depicts the mixing of fuel with oxygen at different distributions along a radial and an axial direction. The stove 500 may be disposed downstream to the fuel mixing assemblies as explained with respect to Figures 1 to 4 and may be coupled to their respect outlet. The stove 500 may include but is not limited to an annular section 502, a hydrogen inlet 504, a cylindrical body 506, and a central line 508. A predetermined amount of oxygen enters from the annular section 502 and is guided around the edges of the central line 508. Further, a predetermined amount of hydrogen enters using the hydrogen inlet 504 and is sent through the center of the central line 508. The central line 508 partially disposed at a center of the cylindrical body 506 to form the annular section 502. The central line 508 is adapted to provide air to the second section. The variation in the flow stream of oxygen and hydrogen from a conventional burner prevents complete mixing of oxygen and hydrogen and the oxygen predominantly travels through the cylindrical body 506. The cylindrical body 506 is adapted to receive the fuel mixture with the restored first ratio, the cylindrical body 506 including the annular section 502, which is adapted to receive the fuel mixture with the restored first ratio and a mixing section.

The stove 500 further includes a control system in order to operate a valve and designing of the valve, which further facilitates control over mixing of hydrogen and the oxygen. Further, the valve may be a porous valve or a specially designed valve to control the flow and mixing of hydrogen and oxygen. The process of prevention of mixing of hydrogen and oxygen allows to overcome the separation of hydrogen and natural gas.

Figure 6 illustrates a flowchart for the fuel blending assembly 600 of hydrogen and natural gas blending, in accordance with an embodiment of the present disclosure. The fuel blending assembly 600 explains the procedure of blending hydrogen and natural gas at a low pressure. The fuel blending assembly 600 adapted to supply a fuel mixture having a pair of gaseous fuels having a first ratio of mixing to a fuel supply assembly 100, 200, 300, 400. The fuel blending assembly may include but is not limited to a Gaseous Hydrogen (GH2) tank 616, a metering and flow control (MFC) unit 604, a feed line 602, a static mixer 608, an analyzer 610, a control unit 614, a self-regulating pressure regulator 606, a pump 612.

The GH2 tank 616 is adapted to supply the GH2 at a first predetermined pressure. Further, the MFC unit 604 is disposed downstream to the GH2 tank 616 and is adapted to control a pressure and a flow rate of the GH2. Moreover, the feed line 602 adapted to supply Natural Gas at a second predetermined pressure. Furthermore, the static mixer 608 has a first inlet adapted to receive the GH2, a second inlet adapted to receive the GH2 from the MFC unit 604, and an outlet that is adapted to mix the GH2 and the NG to form a fuel mixture having the pair of GH2 and NG at a first ratio.

Additionally, the analyzer 610 may be fluidically coupled to an outlet of the static mixture 608 and adapted generate a signal corresponding to an instantaneous ratio of the GH2 and the NG in the fuel mixture. Further, the control unit 614 is communicatively coupled to the analyzer 610 and the MFC unit 604. The control unit 614 is used to compare the instantaneous ratio with the first ratio to determine a difference therebetween. The control unit 614 may further be used to operate the MFC unit 604 to vary flow rate of the GH2 in accordance with the determined difference.

The fuel blending assembly 600 may further include a feed pressure regulator 618, which may be disposed downstream to the GH2 tank and upstream to the MFC unit. Further, the self-regulating pressure regulator 606 may be disposed downstream to the MFC unit 604 and upstream to the static mixer 608 and is adapted to regulate the first predetermined pressure in accordance with the pressure of the NG in the feed line 602. Moreover, the first valve 620 is disposed downstream to the static mixer 608 and upstream to the analyzer 610, where the first valve 620 is operably coupled to the MFC unit 604 to selectively allow the flow of the fuel mixture towards the GH2 analyzer 610. Furthermore, the pump 612 is disposed downstream to the GH2 analyzer 610. Additionally, a first non-return valve (NRV) 622 is disposed in the feed line 602 and upstream to the static mixer 608, a second NRV 624 is disposed downstream to the static mixer 608, and a third NRV 626 is disposed downstream to the pump 612.

In one example, the feed line 602 may provide a piped natural gas (PNG) at 0.6 bar through a 0.5-inch Galvanised Iron (GI) pipeline. Further, the PNG line extends upward to the blending skid container through a 0.5-inch stainless steel (SS) tube. The GH2 may be fed from a cascade cylinder through a 0.25-inch SS tube. The feed pressure regulator 618 is further connected in series with the 0.25-inch SS tube to reduce a GH2 pressure at 35 bar which may be fed to the MFC unit 604. After the MFC unit 604, a self-regulating pressure regulator 606 may be added in series for reducing/matching GH2 pressure, according to PNG pressure.

The GH2 at a reduced pressure (equalling to natural gas) may be fed to the static mixer 608. Similarly, the PNG from the feed line 602 at 0.6 Bar may be directly fed to the static mixer 608. At the output of the static mixer 608, an analyser 610 is connected to measure the percentage of GH2 in the gas mixture. A first valve 620 may be added in series with the analyser 610 lines and a pump 612 is connected to the outlet of the analyser 610. The first valve 620 and the pump 612 may be operated by a control unit 614 and may be interlocked between the first valve 620 and the pump 612, to avoid a dry run of the pump 612.

The pump 612 is feeds a vent gas to a H-NG line after the static mixer 608 with the third NRV 626 which prevents back flow of the vent gas. The percentage value for GH2 for blending may be set manually through a human machine interface (HMI) (2%-10% as per requirement). The analyser 610 provides the percentage value of GH2 in the mixed gas to the control unit 614 continuously. The control unit 614 may compare the percentage value of GH2 of the analyser 610 value (mixed gas) with a percentage value set of hydrogen value (2) and the control unit 614 sends the signal to operate the MFC unit 604. Accordingly, the MFC unit 604 may control the flow of the GH2 gas, and the control unit 614 may operate the MFC unit 604 till the set value is the same as the signal value. If the percentage value for GH2 of the analyzer 610 is greater than the set value, the control unit 614 may send a stop signal to the MFC unit 604. Lastly, the blended gas at the outlet of the static mixer 608 is connected to the feed line 602 through the 0.5-inch SS tube.

In an embodiment, a model for the gas pipeline of a high-rise building which is used to analyze the process and flow condition at different gas mixture compositions is disclosed. The gas station of the high-rise building operates at a predefined pres6sure and maintains the flow conditions in the gas supply pipeline. The pressure required for the operation of the gas station and the gas supply pipeline is calculated using Bernoulli’s principle. The calculated pressure is shown in Table-1.

%H2(vol) %NG (vol) Column radius (m) Column Length (m) Mixture Calorific Value (kJ/kg) Mass Flow Rate in Stove (kg/s) Volume flow rate in stove (m3/s) Required Pressure (Pa)
2 98 0.02 50 55720.36 5.38E-05 8.4E-05 101645.3
4 96 0.02 50 55948.7 5.36E-05 8.52E-05 101639.6
6 94 0.02 50 56185.49 5.34E-05 8.64E-05 101633.9
8 92 0.02 50 56431.18 5.32E-05 8.77E-05 101628.2
10 90 0.02 50 56686.3 5.29E-05 8.89E-05 101622.5
12 88 0.02 50 56951.4 5.27E-05 9.03E-05 101616.8
14 86 0.02 50 57227.07 5.24E-05 9.16E-05 101611.1
16 84 0.02 50 57513.95 5.22E-05 9.3E-05 101605.4
18 82 0.02 50 57812.76 5.19E-05 9.45E-05 101599.
Table - 1

Further, the required mass and volumetric flow rate of gas are calculated by using material and energy balance by comparing the energy outlet in the gas station. Moreover, a minimum gas speed is calculated by the thumb rule, 3-4×laminar flame speed.

The increase in volume percentage of hydrogen increases the gas mixture’s calorific value, which reduces the required mass flow rate of the gas. The increase in volumetric flow rate is due to the decrease in mixture density which happens due to an increase in the fraction of hydrogen. Furthermore, Table - 2 explains the split mass and the volume of hydrogen from natural gas in the pipeline when the gas in the pipeline kept stagnant for a few months. Also, the Table - 2 shows the time required to supply the additional gas (methane and nitrogen), so that the flashback doesn’t occur.

H2 Volume Split(m^3) NG split(m^3) H2 split mass(kg) NG split mass(kg) Methane addition(kg/s) Average flame speed(m/s) Minimum gas speed(m/s) Nitrogen average flame speed(m/s) Minimum gas speed(m/s) Time require to supply(s)
0.001256 0.061544 0.000102 0.040131 8.24E-05 0.434 1.736 0.042 0.168 747.2685
0.002512 0.060288 0.000205 0.039312 8.18E-05 0.468 1.872 0.084 0.336 736.9662
0.003768 0.059032 0.000307 0.038493 8.12E-05 0.502 2.008 0.126 0.504 726.6639
0.005024 0.057776 0.000409 0.037674 8.07E-05 0.536 2.144 0.168 0.672 716.3616
0.00628 0.05652 0.000512 0.036855 8E-05 0.57 2.28 0.21 0.84 706.0593
0.007536 0.055264 0.000614 0.036036 7.94E-05 0.604 2.416 0.252 1.008 695.7571
0.008792 0.054008 0.000717 0.035217 7.88E-05 0.638 2.552 0.294 1.176 685.4548
0.010048 0.052752 0.000819 0.034398 7.81E-05 0.672 2.688 0.336 1.344 675.1525
0.011304 0.051496 0.000921 0.033579 7.75E-05 0.706 2.824 0.378 1.512 664.8502
Table - 2

The present disclosure presents us with various technical advancements such as preventing flashbacks and blowouts while lighting the stove. Further, the present disclosure facilitates the blending of hydrogen and natural gas. Moreover, the model of the present disclosure is used to determine and maintain the constant composition required for the smooth functioning and blending of hydrogen with natural gas.

While specific language has been used to describe the present subject matter, any limitations arising on account thereto, are not intended. As would be apparent to a person in the art, various working modifications may be made to the method in order to implement the inventive concept as taught herein. The drawings and the foregoing description give examples of embodiments. Those skilled in the art will appreciate that one or more of the described elements may well be combined into a single functional element. Alternatively, certain elements may be split into multiple functional elements. Elements from one embodiment may be added to another embodiment.
,CLAIMS:1. A fuel supply assembly (100, 200, 300, 400) adapted to supply a fuel mixture, comprising:
a feed line (110) adapted to receive the fuel mixture of a pair of gaseous fuels having a first ratio of mixing;
a replenishment tank (104) fluidically coupled to the feed line (110) the fuel mixture having a second ratio of mixing, wherein the replenishment tank (104) is adapted to add a gas of the pair gases to restore the first ratio from the second ratio; and
an outlet disposed downstream to the replenishment tank (104) and adapted to supply the fuel mixture with the restored first ratio.

2. The fuel supply assembly (100, 200, 300, 400) as claimed in claim 1, wherein the feed line comprises a spiral pipe (106).

3. The fuel supply assembly (100, 200, 300, 400) as claimed in claim 1, comprising:
a second tank (312) adapted to hold a flame suppressing gas;
a first mixing junction valve (316) adapted to mix the fuel mixture having the second ratio of mixing, the first mixing junction valve (316) comprising:
a first inlet fluidically coupled to the second tank (312);
a second inlet fluidically coupled to the feed line (310) and adapted to receive the fuel mixture having the second ratio of mixing; and
an outlet (308) disposed upstream to the replenishment tank (304) and adapted to supply the fuel mixture having the second ratio and mixed with the flame suppressing gas to the replenishment tank (304).

4. The fuel supply assembly (100, 200, 300, 400) as claimed in claim 3, comprising:
a second mixing junction valve (220) disposed downstream to the replenishment tank (204) and upstream to a stove and adapted to mix additional flame suppressing gas to the fuel mixture with restored first mixture.

5. The fuel supply assembly (100, 200, 300, 400) as claimed in claim 1, comprising a third mixing junction valve (408) comprising:
a first inlet (410) fluidically coupled to the replenishment tank (406) and adapted to receive another fuel mixture of a gas of the pair of gases and a flame suppressing gas;
a second inlet (412) fluidically coupled to the feed line (404) and adapted to receive the fuel mixture having the second ratio of mixing; and
an outlet (414) disposed upstream to the replenishment tank and adapted to supply the fuel mixture having the first ratio and mixed with the flame suppressing gas.

6. The fuel supply assembly (100, 200, 300, 400) as claimed in claim 1, comprising a stove nozzle (500) adapted to receive the fuel mixture with restored first ratio, the nozzle comprising:
a cylindrical body (506) adapted to receive the fuel mixture with the restored first ratio, the cylindrical body (506) comprising an annular section (502) adapted to receive the fuel mixture with the restored first ratio and a mixing section; and
a central line (508) partially disposed at a center of the cylindrical body (506) to form the annular section (502), wherein the central line (508) is adapted to provide air to the second section.

7. The fuel supply assembly (100, 200, 300, 400) as claimed in claims 1, 4, and 5, wherein the flame suppressing gas is Nitrogen.

8. A fuel blending assembly (600) adapted to supply a fuel mixture having a pair of gaseous fuels having a first ratio of mixing to a fuel supply assembly (100, 200, 300, 400), the fuel blending assembly (600) comprising:
a Gaseous Hydrogen (GH2) tank (616) adapted to supply the GH2 at a first predetermined pressure;
a metering and flow control (MFC) unit (604) disposed downstream to the GH2 tank (616) and adapted to control a pressure and a flow rate of the GH2;
a feed line (602) adapted to supply Natural Gas at a second predetermined pressure;
a static mixer (608) having a first inlet adapted to receive the GH2, a second inlet adapted to receive the GH2 from the MFC unit (604), and an outlet adapted to mix the GH2 and the NG to form a fuel mixture having the pair of GH2 and NG at a first ratio;
an analyzer (610) fluidically coupled to an outlet of the static mixture and adapted generate a signal corresponding to an instantaneous ratio of the GH2 and the NG in the fuel mixture; and
a control unit (614) communicatively coupled to the analyzer (610) and MFC unit (604), wherein the control unit is adapted to:
compare the instantaneous ratio with the first ratio to determine a difference therebetween; and
operate the MFC unit (604) to vary flow rate of the GH2 in accordance with the determined difference.

9. The fuel blending assembly (600) as claimed in claim 8, comprising:
a feed pressure regulator (618) disposed downstream to the GH2 tank (616) and upstream to the MFC unit;
a self-regulating pressure regulator (606) disposed downstream to the MFC unit (604) and upstream to the static mixer (608) and adapted to regulate the first predetermined pressure in accordance with the pressure of the NG in the feed line (602);
a first valve (620) disposed downstream to the static mixer (608) and upstream to the analyzer (610), wherein the first valve (620) is operably coupled to the MFC unit (604) to selectively allow the flow of the fuel mixture towards the GH2 analyzer (610);
a pump (612) disposed downstream to the GH2 analyzer (610);
a first non-return valve (NRV) (622) disposed in the feed line (602) and upstream to the static mixer (608);
a second NRV (624) disposed downstream to the static mixer (608); and
a third NRC (626) disposed downstream to the pump (612).