DESC:FIELD OF INVENTION
The present disclosure relates to fuel cells and more particularly to hydrogen enriched natural gas (HCNG) for use in Solid Oxide Fuel Cell power generation systems.
BACKGROUND
In conventional system design approach, Solid Oxide Fuel Cell (SOFC) system is fed with gaseous or liquid fuels. In the next step, this fuel undergoes clean-up process for the removal of contaminants like sulfur, siloxanes, moisture and other VOC’s. In further step, fuel is reformed to produce hydrogen rich gas mixture required for solid oxide fuel cell stack for the electrochemical conversion process. Although, solid oxide fuel cell stack requires hydrogen rich fuel mixture for power generation, feeding 100% hydrogen directly to SOFC stack offers disadvantages in terms of reduced efficiency and increased solid oxide fuel cell degradation. Similarly, feeding fuel with 100% hydrocarbon content reduces overall efficiency of the system and reduces system reliability due to increased complexity and additional sub-systems.

Solid oxide fuel cell system fuelled with different gaseous and liquid hydrocarbon fuels require steps such as –
- gas purification and conditioning ( e.g. sulfur/siloxane/moisture/VOC removal)
- complete or partial external reformation before feeding the fuel to the solid oxide fuel cell stack.

The solid oxide fuel cell system can be bulky, less efficient, less reliable due to increase in gas treatment and reformation efforts and complex process loops.

The solid oxide fuel cell systems integrated with gas clean-up and external reformation system often becomes bulky due to large size sub systems like desulfurizer or external reformer. Figure 1 illustrates conventional Solid Oxide Fuel Cell System with gas clean-up & external reformation (Prior Art).

Incoming gas quality has larger impact on the performance of these sub-systems and this ultimately affects the performance & efficiency of solid oxide fuel cell system. To make the solid oxide fuel cell system more reliable, it is desired to reduce the failures and reduce the components that might fail during system operation. The input gas quality to the stack has larger impact on the performance and life of the SOFC system.

Therefore, there is a need for a solid oxide fuel cell (SOFC) with Hydrogen enriched natural gas (HCNG) fuel for power generation systems. There is a requirement for an improved system and method for using Hydrogen enriched natural gas (HCNG) in solid oxide fuel cells for power generation.

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

Figure 1 (a) and 1 (b) illustrates Prior Art (conventional solid oxide fuel cell system with gas clean-up & external reformation).

Figure 2 illustrates a block diagram of a solid oxide fuel cell system with hydrogen enriched natural gas (HCNG) fuel in accordance with an embodiment of the present invention.

Figure 3 illustrates a Solid Oxide Fuel Cell (SOFC) Stack with hydrogen enriched natural gas (HCNG) fuel and a single solid oxide fuel cell in accordance with an embodiment of the present invention.

Figure 4 illustrates Solid Oxide Fuel Cell with hydrogen enriched natural gas (HCNG) fuel and scheme of electrochemical reactions in accordance with an embodiment of the present invention.

Figure 5 illustrates process scheme with hydrogen enriched natural gas (HCNG) fuelled solid oxide fuel cell stack in accordance with an embodiment of the present invention.

Further, skilled artisans will appreciate that elements in the figures are illustrated for simplicity and may not have necessarily been drawn to scale. Furthermore, in terms of the construction of the device, one or more components of the device may have been represented in the figures by conventional symbols, and the figures may show only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the figures with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.

OBJECTIVES OF THE INVENTION
The main objective of the present disclosure is to design a system and method for using Hydrogen enriched natural gas (HCNG) in solid oxide fuel cells for power generation.

Another objective of the present disclosure is to provide a process scheme with HCNG fuelled solid oxide fuel cell.

Another objective is to provide solid oxide fuel cell (SOFC) with Hydrogen enriched natural gas (HCNG) fuel for power generation systems.

Yet another objective of the present disclosure is to ensure reliable and smooth operation of the solid oxide fuel cell adapted to use hydrogen enriched natural gas.

SUMMARY OF THE INVENTION
The present disclosure relates to fuel cells and more particularly to hydrogen enriched natural gas (HCNG) for use in Solid Oxide Fuel Cell power generation systems. Therefore, the present invention provides a solid oxide fuel cell (SOFC) with Hydrogen enriched natural gas (HCNG) fuel for power generation systems. A system and a method for using Hydrogen enriched natural gas (HCNG) in solid oxide fuel cells for power generation is also provided.

DETAILED DESCRIPTION
For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the figures 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 system, 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. It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the invention and are not intended to be restrictive thereof. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The system, methods, and examples provided herein are illustrative only and not intended to be limiting.
The terminology and structure employed herein is for describing, teaching and illuminating some embodiments and their specific features and elements and does not limit, restrict or reduce the spirit and scope of the invention.
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
Examples
Example 1
Figure 2 illustrates a block diagram of a solid oxide fuel cell system with hydrogen enriched natural gas (HCNG) fuel in accordance with an embodiment of the present invention. In one embodiment, solid oxide fuel cells are used for power generation. Hydrogen enriched natural gas (HCNG) is generated by adding hydrogen to the gas grid or partly reforming the natural gas at source of use. In an embodiment, hydrogen enriched natural gas (HCNG) fuel containing 5-50% hydrogen is excellent for use in Solid Oxide Fuel Cell power generation systems. In another embodiment, hydrogen enriched natural gas (HCNG) fuel containing 5-50% hydrogen is excellent for Solid Oxide Fuel Cell based combined heat and power generation systems. In another embodiment, already present H2 in HCNG fuel reduces or eliminates the gas purification and reformation efforts which simplify the SOFC system by reducing some of the sub-systems. As compared to prior art systems, in the present disclosure, complex loops in the system are eliminated. Therefore, solid oxide fuel cell system with hydrogen enriched natural gas (HCNG) fuel in accordance with an embodiment of the present invention has enhanced electrical efficiency as well as combined efficiency.

In the illustrated embodiment, the system for using Hydrogen enriched natural gas (HCNG) fuel for power generation in Solid Oxide Fuel Cell may include a fuel unit comprising hydrogen enriched natural gas (HCNG) fuel comprising 5-50% hydrogen, solid Oxide Fuel Cell Stack for partial or complete internal reformation of fuel for power generation and other sub systems as required.
Further referring to Figure 2, the disclosure provides a system for conversion of hydrogen enriched natural gas (HCNG) fuel into hydrogen rich mixture using partial external reformation on the Solid Oxide Fuel Cell stack. In another embodiment, conversion of hydrogen enriched natural gas (HCNG) fuel into hydrogen rich mixture is performed using complete internal reformation on the Solid Oxide Fuel Cell stack. Therefore, partial or complete reformation occurs on solid oxide fuel cell stack as shown in Figure 2 in accordance with our present disclosure. In an another embodiment, the present method of utilizing hydrogen enriched natural gas has immediate advantage for eliminating the gas treatment unit (e.g. desulfuriser), reduce the size of the reformer or remove the reformer, make compact SOFC system, make SOFC system with high efficiency, and maintain high fuel utilization on the stack, simplify the operation and control of the SOFC system and reduce cost of the SOFC system.

Example 2

Figure 3 illustrates construction of a Solid oxide fuel cell Stack with hydrogen enriched natural gas (HCNG) fuel. In an embodiment, stack is made up of plurality of solid oxide fuel cells arranged together as shown in Figure 3. In another embodiment, a single solid oxide fuel cell is shown in detailed manner. In the illustrated embodiment, solid oxide fuel cell consists of solid-electrolyte, cathode, anode and interconnects. In an another embodiment, all of these components of solid oxide fuel cell with hydrogen enriched natural gas (HCNG) fuel have chemical, mechanical and thermal stability under operating conditions for proper operation of solid oxide fuel cell. Further referring to Figure 3, seal and flow field has been depicted in said figure. However, it should be appreciated by a person skilled in the art that this construction should not be considered as limiting, and minor modifications can be carried out without departing from the scope of the application.

In the illustrated embodiment, a solid oxide Fuel Cell Stack for partial or complete internal reformation of fuel may comprise fuel which is hydrogen enriched natural gas (HCNG) comprising 5-50% hydrogen.

In one of the embodiments of the present invention, composition of CNG is as follows:

Table 1

Composition of CNG according to an embodiment of present invention

H2 18.5 %
CH4 78.5 %
CO2 3.0 %
Total 100.0 %

Example 3

Figure 4 illustrates detailed view of single solid oxide fuel cell with hydrogen enriched natural gas (HCNG) fuel. As referred earlier, solid oxide fuel cell with hydrogen enriched natural gas (HCNG) fuel consists of solid-electrolyte, cathode, anode and interconnectors. Fuel (in) direction and fuel (out) direction are depicted by bold arrows in said figure. Similarly, direction of cooling air (in) and cooling air (out) are shown in said figure in accordance with an embodiment of the present disclosure. In an embodiment, internal reformation occurs on the anode of the SOFC stack. In another embodiment, temperature of solid oxide fuel cell is maintained as required and referred by reference (B) in Figure 4. In an embodiment, at temperature in excess of 700 degree Celsius, reformation happens on the outer anode layer and thus hydrocarbons present in the HCNG is converted to Hydrogen for electrochemical reactions. In an embodiment, electrochemical reactions occur in said solid oxide fuel cell as shown in Figure 4.

In the illustrated embodiment, a solid oxide fuel cell (SOFC) with Hydrogen enriched natural gas (HCNG) fuel for Power Generation Systems may include an anode, a cathode, an electrolyte and interconnects. The hydrogen enriched natural gas (HCNG) fuel may comprise 5-50% hydrogen for Solid Oxide Fuel Cell and internal reformation may occurs on the anode of the SOFC stack.

Electrochemical reactions in solid oxide fuel cell with hydrogen enriched natural gas (HCNG) fuel are shown below:-

At Anode
INTERNAL REFORMATION (CH4 + H2O = CO + 3H2, Endothermic)

ELECTROCHEMICAL REACTION (H2+ 0.5 O2 = H2O, Exothermic)

At Cathode

CATHODE 0.5 O2 + 2e- = O2-

In an embodiment, a negatively charged ion (O2-) is transferred from the cathode through the electrolyte to the anode with water produced at the anode.

Further referring to Figure 4, in an embodiment, hydrocarbon present in HCNG fuel are steam reformed at the anode causing drop in cell temperature and hydrogen in HCNG undergo electrochemical reaction causing increase in temperature. In another embodiment, the thermal balance of the cell is well maintained due to simultaneous exothermic and endothermic reactions and stack temperature does not drop as seen in higher extent of internal reformation on SOFC stack. As a result of this, cathode air requirement is cut down and balance of load is also reduced.

Example 4

Figure 5 illustrates process scheme with HCNG fuelled SOFC in accordance with an embodiment of the present disclosure. In another embodiment, details on system, operation and control of the solid oxide fuel cell system fuelled with HCNG fuel is depicted in Figure 5. In the present method and system, HCNG fuel which is clean fuel is directly send to the mixer and mixed with steam for generating uniform fuel-steam mixture. In an embodiment, the fuel-steam mixture is then directly sent to the SOFC stack through a metal pipe that may be coated reformer catalyst. In addition to the internal reformation on the anode of the SOFC stack, reformation takes place in metal pipe. As referred earlier, hydrocarbon present in HCNG fuel are steam reformed at the anode causing drop in cell temperature and hydrogen in HCNG undergo electrochemical reaction causing increase in temperature. In another embodiment, the thermal balance of the cell is well maintained due to simultaneous exothermic and endothermic reactions.

In another embodiment, HCNG gas which has hydrogen present in it do not require extensive external reformation and only partial external reformation or complete internal reformation on the stack itself can be done to generate hydrogen rich gas for SOFC system. Since the extent of reformation is reduced due to HCNG, reformer as a separate sub-system can be eliminated and in-situ reformation in the fuel flow area (metal tube coated with reformer catalyst) can be performed and most of the fuel gets internally reformed on to the fuel cell stack anode layers. Increased extent of internal reformation can drop the stack temperature significantly and hence a pre-reformer in the form of coated metal tube can be used if hydrocarbon content in the HCNG increases.

In the illustrated embodiment, the method for using Hydrogen enriched natural gas (HCNG) fuel for power generation in Solid Oxide Fuel Cell may include providing hydrogen enriched natural gas (HCNG) fuel comprising 5-50% hydrogen to solid oxide fuel cell stack, performing partial or complete internal reformation of fuel on Solid Oxide Fuel Cell Stack and other required steps.

Without departing from the scope of invention, a steam reformation may be used for partial external reformation as well internal reformation. In another embodiment, fuel not consumed by the stack may be burned inside tail gas oxidiser and the heat may be recovered for pre-heating incoming air, fuel and water. In a further embodiment, a steam may be generated by using leftover heat of the flue gases and mixed with HCNG fuel.

Further referring to Figure 5, in another embodiment, at temperature in excess of 700 degree Celsius, reformation happens on the outer anode layer and thus hydrocarbons present in the HCNG is converted to Hydrogen for electrochemical reactions. In yet another embodiment, with the steam reformation on the stack or partial external reformation inside a metal tube, less amount of gas needs to be handled and this reduces the size of pipes, cavities or gas chambers present in the fuel cell system.

The present method and system of utilizing hydrogen enriched natural gas has immediate advantage for eliminating the gas treatment unit (e.g. desulfuriser), reduce the size of the reformer or remove the reformer, make compact SOFC system, make SOFC system with high efficiency, and maintain high fuel utilization on the stack, simplify the operation and control of the SOFC system and reduce cost of the SOFC system.

The present disclosure provides Hydrogen enriched natural gas (HCNG) fuel for use in Solid Oxide Fuel Cell power generation systems. The invention provides a system, a method and control strategy with HCNG fuel. The present invention reduces size and improves efficiency of SOFC system. It also reduces life cycle cost of SOFC system.

Example 5 (Prior Art)
Stack performance with HCNG fuel for complete external reformation in CPOX REF. (Prior Art)
As discussed earlier, the prior art requires external reformation. Fuel composition in the prior art is as follows:
Table 2
Fuel Composition (prior art)
CH4
0.01%
H2O
5.32%
H2
34.45%
CO
15.98%
CO2
1.90%
N2
42.34%

Table 3: Details of Stack performance with HCNG fuel for complete external reformation in CPOX REF in the Prior Art

In the prior art (Table 3) : at cathode air, 100 slm is required.

As shown in Table 3, the prior art shows:
Input power required: 2346.06 Watt
Stack Power output: 1136.85 Watt
Efficiency of Stack: 48.46%

Example 6 (Present Invention):
Stack performance with HCNG fuel for 100 % reformation on stack.

The present disclosure provides Hydrogen enriched natural gas (HCNG) fuel for use in Solid Oxide Fuel Cell power generation systems. The invention provides a system, a method and control strategy with HCNG fuel. The present invention reduces size and improves efficiency of SOFC system. It also reduces life cycle cost of SOFC system.

Table 4: Fuel Composition in accordance with an embodiment of the present invention (example 6) is as follows:

Fuel Composition in accordance with an embodiment of the present invention

CH4
40.42%
H2O
48.51%
H2
9.53%
CO
0.00%
CO2
1.54%
N2
0.00%

Table 5: (Present Invention): Details of Stack performance with HCNG fuel for 100 % reformation on stack in accordance with an embodiment of the present invention.

As shown in Table 5, in the present invention:

Input power required: 1872.13 Watt
Stack Power output : 1152.45 Watt
Efficiency of Stack : 61.56%

Table 6: Comparison table
Features Prior Art Present Invention
Input power required 2346.06 Watt
1872.13 Watt
Stack Power output 1136.85 Watt 1152.45 Watt
Efficiency of Stack 48.46%
61.56%

Table 7: Comparison Table

Prior Art Present Invention
At cathode air, 100 slm is required. At cathode air, 80 slm is required.
Therefore, about 20 slm less is required in our invention which means that the present invention is more efficient

In the present invention, at cathode air, 80 slm is required as shown in table 5. However, in the prior art ( Table 3), at cathode air, 100 slm is required. Hence, in the present invention, about 20 slm is saved which means less power is required and present invention shows higher efficiency.

Table 8: Comparison Table

Prior Art Present Invention
Heat of reaction 592.30 Watt 72.77 Watt
Convective Heat anode -18.17 Watt -8.86 Watt
Convective Heat cathode -321.22 Watt -256.98 Watt
Excess 465.78 Watt 23.08 Watt

In an embodiment of the present invention, present invention provides a method for using hydrogen enriched natural gas (HCNG) in solid oxide fuel cell(s)/stack for power generation, said method comprising the steps of:
providing HCNG fuel directly to the mixer and mixing HCNG fuel with steam for generating uniform fuel-steam mixture; wherein the hydrogen enriched natural gas (HCNG) fuel comprising 5-50% hydrogen;
providing the fuel-steam mixture directly to the SOFC stack through a flow channel and optionally coating the internal surface of the flow channel with a reformer catalyst;
internally reforming the fuel-steam mixture partially or completely on the anode of the SOFC stack at temperature in excess of 700 degree Celsius, wherein a substantial amount of the HCNG fuel gets internally reformed on the fuel cell stack anode layers; and the hydrocarbons present in the hydrogen enriched natural gas (HCNG) are converted to hydrogen which undergoes electrochemical reactions to produce energy; and
maintaining thermal balance of the solid oxide fuel cell(s)/stack.

In yet another embodiment of the present invention, the method further comprising burning of fuel inside tail gas oxidizer and recovering the heat for use in pre-heating incoming air, fuel and water. The term “tail gas oxidizer” means – tail has oxidizer (i.e. space/ cavity in after burner).

In yet another embodiment of the present invention, the method further comprising generating steam by using leftover heat from the exhaust gas/ fuel gases and/or mixing with HCNG fuel. The term “leftover heat from the exhaust gas” means waste heat or unrecovered heat of the exhaust gas.

In yet another embodiment of the present invention, hydrogen enriched natural gas (HCNG) fuel comprising:
H2: 9.53%
CH4 : 40.42%
H2O: 48.51%
CO: 0.00%
CO2: 1.54%
N2: 0.00%

In yet another embodiment of the present invention, the method hydrogen enriched natural gas (HCNG) fuel comprising:
H2 18.5 %
CH4 78.5 %
CO2 3.0 %

In yet another embodiment of the present invention, the method comprising decreasing air requirement at cathode and reducing balance of load and exhibiting more than 60 % efficiency.

In yet another embodiment of the present invention, solid oxide fuel cell (SOFC) or solid oxide fuel cell stack with hydrogen enriched natural gas (HCNG) fuel for power generation systems,
said solid oxide fuel cell comprising solid-electrolyte, cathode, anode and interconnects; and
the hydrocarbons present in the HCNG fuel are internally reformed on the outer anode of the SOFC stack layer at a temperature in excess of 700 degree Celsius and the hydrocarbons present in the hydrogen enriched natural gas (HCNG) undergoes electrochemical reactions and maintains thermal balance in the solid oxide fuel cell;
wherein said solid oxide fuel cell comprises hydrogen enriched natural gas (HCNG) comprising 5-50% hydrogen.

In yet another embodiment of the present invention, the solid Oxide Fuel Cell (SOFC) Stack comprising of plurality of solid oxide fuel cells arranged together, wherein each solid oxide fuel cell comprises hydrogen enriched natural gas (HCNG) comprising 5-50% hydrogen.

In yet another embodiment of the present invention, the system for using Hydrogen enriched natural gas (HCNG) fuel for power generation in Solid Oxide Fuel Cell, said system comprising:
fuel unit comprising hydrogen enriched natural gas (HCNG) fuel comprising 5-50% hydrogen; and
solid Oxide Fuel Cell Stack for partial or complete internal reformation of the HCNG fuel for power generation.

In yet another embodiment of the present invention, better thermal balance of SOFC system is maintained.

In yet another embodiment of the present invention, there is reduction in Capital expenditures (CapEx). Capital expenditures means funds used by a company to acquire, upgrade, and maintain physical assets such as property, plants, buildings, technology, or equipment.

In yet another embodiment of the present invention, there is stable operation of SOFC system.

In yet another embodiment of the present invention, life cycle cost of the system is reduced.

ADVANTAGES OF PRESENT INVENTION:
Following are non-limiting advantages of the present invention:-
1. Elimination of components.
2. Reduce size of required components.
3. Maintain high fuel utilization on stack.
4. Reduction in Capital expenditures (CapEx).
5. Maintain high efficiency.
6. Better thermal balance of SOFC system.
7. Stable operation of SOFC system.
8. Reduction in life cycle cost.

It will thus be seen that the objects set forth above, among those made apparent from the preceding description, are efficiently attained, and since certain changes may be made in the constructions set forth without departing from the spirit and scope of the invention, it is intended that all matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. The invention has been described with reference to preferred and alternate embodiments. Modifications and alterations will become apparent to those skilled in the art upon reading and understanding the detailed discussion of the invention provided herein. This invention is intended to include all such modifications and alterations insofar as they come within the scope of the present invention. These and other modifications of the preferred embodiments as well as other embodiments of the invention will be obvious from the disclosure herein, whereby the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.
,CLAIMS:1. Method for using hydrogen enriched natural gas (HCNG) in solid oxide fuel cell(s)/stack for power generation, said method comprising the steps of:
providing HCNG fuel directly to the mixer and mixing HCNG fuel with steam for generating uniform fuel-steam mixture; wherein the hydrogen enriched natural gas (HCNG) fuel comprising 5-50% hydrogen;
providing the fuel-steam mixture directly to the SOFC stack through a flow channel and optionally coating the internal surface of the flow channel with a reformer catalyst;
internally reforming the fuel-steam mixture partially or completely on the anode of the SOFC stack at temperature in excess of 700 degree Celsius, wherein a substantial amount of the HCNG fuel gets internally reformed on the fuel cell stack anode layers; and the hydrocarbons present in the hydrogen enriched natural gas (HCNG) are converted to hydrogen which undergoes electrochemical reactions to produce energy; and
maintaining thermal balance of the solid oxide fuel cell(s)/stack.

2. The method as claimed in claim 1, further comprising burning of fuel inside tail gas oxidizer and recovering the heat for use in pre-heating incoming air, fuel and water.

3. The method as claimed in claim 1, further comprising generating steam by using leftover heat from the exhaust gas/ fuel gases and/or mixing with HCNG fuel.

4. The method as claimed in claim 1, wherein hydrogen enriched natural gas (HCNG) fuel comprising:
H2: 9.53%
CH4 : 40.42%
H2O: 48.51%
CO: 0.00%
CO2: 1.54%
N2: 0.00%

5. The method as claimed in claim 1, wherein hydrogen enriched natural gas (HCNG) fuel comprising:
H2 18.5 %
CH4 78.5 %
CO2 3.0 %

6. The method as claimed in claim 1, comprising decreasing air requirement at cathode and reducing balance of load and exhibiting more than 60 % efficiency.

6. Solid oxide fuel cell (SOFC) or solid oxide fuel cell stack with hydrogen enriched natural gas (HCNG) fuel for power generation systems,
said solid oxide fuel cell comprising solid-electrolyte, cathode, anode and interconnects; and
the hydrocarbons present in the HCNG fuel are internally reformed on the outer anode of the SOFC stack layer at a temperature in excess of 700 degree Celsius and the hydrocarbons present in the hydrogen enriched natural gas (HCNG) undergoes electrochemical reactions and maintains thermal balance in the solid oxide fuel cell;
wherein said solid oxide fuel cell comprises hydrogen enriched natural gas (HCNG) comprising 5-50% hydrogen.

7. Solid Oxide Fuel Cell (SOFC) Stack comprising of plurality of solid oxide fuel cells arranged together, wherein each solid oxide fuel cell comprises hydrogen enriched natural gas (HCNG) comprising 5-50% hydrogen.

8. System for using Hydrogen enriched natural gas (HCNG) fuel for power generation in Solid Oxide Fuel Cell, said system comprising:
fuel unit comprising hydrogen enriched natural gas (HCNG) fuel comprising 5-50% hydrogen; and
solid Oxide Fuel Cell Stack for partial or complete internal reformation of the HCNG fuel for power generation.