TECHNICAL FIELD
[1] The present disclosure relates to the field of process industry equipment's. Particularly, the present disclosure relates to an ejector system and a multistage ejector system.
BACKGROUND OF THE DISCLOSURE
[2] The information in this section merely provides background information related to the present disclosure and may not constitute prior art(s) for the present disclosure.
[3] In process industries, ejectors are well known in the art. The ejectors are mainly used to create a vacuum in vacuum units of the process industries. The ejectors work by accelerating a high pressurized stream (motive fluid) through a nozzle that converts the pressure of the steam into a velocity of the steam. The high pressurized stream (motive fluid) may be a fresh steam.
[4] Further, the ejectors are used to increase pressure of a stream discharged from the vacuum units of the process industries. The stream may be a mixture of steam and hydrocarbons. The ejectors are also called jet pumps. The pressure of the stream may be increased from a low level to medium level or high level by utilizing the high-pressure motive fluid. The stream discharged from the vacuum units of the process industries are received in the ejector and gets mixed with the high-pressure motive fluid, thereby the pressure of the stream fluid gets increased. The mixture of the stream and the high-pressure motive fluid may be condensed later on in by a condenser, depending on the type of the stream or based on process requirements. For example, the stream including air or nitrogen etc. can be treated as non-condensable stream and hydrocarbons or steam etc., can be treated as condensable stream. Therefore, ejectors evacuate non-condensable gas contents from the mixture of the stream and the high-pressure motive fluid upto a limited extent, as per requirements.
[5] The mixture of the stream and the high-pressure motive fluid is routed to the condenser after discharging from the ejector for either condensation or removal of non-condensable gases from the mixture of the stream and the high-pressure motive fluid. The primary function of the condenser is to condense the condensable part of the mixture of the stream and the high-pressure motive fluid based on process requirements.

This condenser can be either surface type or direct contact type. However, the ejector includes single condenser that is insufficient sometimes to achieve the required rate of condensation of the mixture of the stream and the high-pressure motive fluid. The condensation also depends on cooling water temperature which varies from season to season. Quality of cooling water also may vary which changes the heat capacity and changing the properties of heat recovery.
[6] Further, there are instances when multistage ejectors are required to achieve the required vacuum in the vacuum units of the process industries. The ejectors of the multistage ejectors are connected to each other in a series connection. In the multistage ejector, the mixture of the stream and the high-pressure motive fluid discharged from a first ejector is received at a second ejector as the stream through a suction inlet of the other ejector.
[7] The multistage ejector may be provided with an inter-condenser defined between the ejectors as per the process requirement. Therefore, the mixture of the stream and the high-pressure motive fluid discharged from the first ejector passes through the inter-condenser so that the mixture of the stream and the high-pressure motive fluid can be condensed before receiving by the second ejector, which reduces the load on the second ejector. The condenser is sized depending on the quality of the mixture of the stream and the high-pressure motive fluid and the temperature of the fluid in the condenser for condensing the mixture of the stream and the high-pressure motive fluid. However, the design of the condenser is critical as the pressure of the mixture of the stream and the high-pressure motive fluid lowers inside the condenser which directly affects the performance of the second ejector. Because of lowering the pressure of the mixture of the stream and the high-pressure motive fluid, a large amount of motive fluid is required in the second ejector, and suction pressure generated by the second ejector is reduced, thereby achieving the required vacuum in the vacuum units of the process industries is difficult.
[8] In some cases, the ejector has a pre-condenser before the first ejector and an after-condenser after the last ejector. These condensers are provided to condense the stream/ the mixture of the stream and the high-pressure motive fluid. Any failure in the

vacuum units of the process industries may reduce and the overall efficiency of the processes which are performed in process industries
[9] The present disclosure is directed to overcome one or more limitations stated above or any other limitations associated with the prior art.
SUMMARY OF THE DISCLOSURE
[10] The one or more shortcomings of the prior art are overcome by the system/device as claimed, and additional advantages are provided through the provision of the system/device as claimed in the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
[11] In one non-limiting embodiment of the present disclosure, an ejector system is disclosed. The ejector system includes an ejector having a primary nozzle, a secondary nozzle, a heat exchanger. The primary nozzle is defined with a primary inlet and a primary outlet. The secondary nozzle is defined with a secondary inlet and a secondary outlet. The secondary nozzle is fluidly coupled to the primary nozzle through the primary outlet. The heat exchanger encloses at least a portion of the secondary nozzle for heat exchange therebetween. Further, an inlet passage of the heat exchanger is fluidly connected to the secondary outlet of the secondary nozzle. The condenser is disposed in fluid communication with an outlet passage of the heat exchanger.
[12] In an embodiment of the present disclosure, the condenser is fluidly connected to the secondary outlet of the secondary nozzle. The fluid discharged from the secondary outlet is selectively routed to at least one of the heat exchangers and the condenser.
[13] In an embodiment of the present disclosure, the primary nozzle includes a primary convergent section including the primary inlet, a primary throat in fluid communication with the primary convergent section, and a primary divergent section in fluid communication with the primary throat.

[14] In an embodiment of the present disclosure, the secondary nozzle includes a duct enclosing at least a portion of the primary nozzle, the duct including the secondary inlet, a secondary convergent section fluidly coupled to the secondary inlet through the duct, a secondary throat in fluid communication with the secondary convergent section and a secondary divergent section in fluid communication with the secondary throat.
[15] In an embodiment of the present disclosure, the heat exchanger encloses at least one of the secondary convergent section and at least a portion of the secondary throat.
[16] In an embodiment of the present disclosure, an internal surface of the heat exchanger is defined with projections configured to increase surface area for heat exchange between the heat exchanger and the portion of the secondary nozzle enclosed by the heat exchanger.
[17] In an embodiment of the present disclosure, the secondary nozzle is positioned substantially coaxial relative to the primary nozzle.
[18] In an embodiment of the present disclosure, the secondary inlet of the secondary nozzle includes at least one of a single inlet and a plurality of inlets.
[19] In an embodiment of the present disclosure, the secondary inlet is positioned at least one of substantially perpendicular, substantially parallel, and inclined, relative to the primary inlet of the primary nozzle.
[20] In another non-limiting embodiment of the present disclosure, a multistage ejector system is disclosed. The multi-stage ejector includes a plurality of ejector systems. Each of the plurality of ejector systems include a primary nozzle, a secondary nozzle, a heat exchanger, and a condenser. The primary nozzle is defined with a primary inlet and a primary outlet. The secondary nozzle is defined with a secondary inlet and a secondary outlet. The secondary nozzle is fluidly coupled to the primary nozzle through the primary outlet. The heat exchanger encloses at least a portion of the secondary nozzle for heat exchange therebetween. Further, an inlet passage of the heat exchanger is fluidly connected to the secondary outlet of the secondary nozzle. The condenser is disposed in fluid communication with an outlet passage of the heat

exchanger. Furthermore, at least one conduit is fluidly connecting the plurality of ejector systems for fluid flow therebetween.
[21] In an embodiment of the present disclosure, the at least one conduit fluidly connects an outlet passage of a first heat exchanger of a first ejector system with an inlet passage of a second heat exchanger of a second ejector system.
[22] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined together to form a further embodiment of the disclosure.
[23] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[24] The novel features and characteristics of the disclosure are set forth in the description. The disclosure itself, however, as well as a preferred mode of use, further objectives, and advantages thereof, will best be understood by reference to the following description of an illustrative embodiment when read in conjunction with the accompanying drawings. One or more embodiments are now described, by way of example only, with reference to the accompanying drawings wherein like reference numerals represent like elements and in which:
[25] Figure 1 illustrates a schematic view of an ejector system, according to an embodiment of the present disclosure;
[26] Figure 2 illustrates a schematic view of the ejector system of Figure 1, including a plurality of extended surfaces, according to an embodiment of the present disclosure;

[27] Figure 3 illustrates a schematic view of the ejector system of Figure 1, including an inlet passage and an outlet passage at different walls of a heat exchanger, according to an embodiment of the present disclosure;
[28] Figure 4 illustrates a schematic view of a multistage ejector system including two ejector systems in which an outlet of one ejector system is connected to an inlet passage of a heat exchanger of the other ejector system, according to a second embodiment of the present disclosure; and
[29] Figure 5 illustrates a schematic view of a multistage ejector system including four ejector systems fluidly connected to each other, according to a second embodiment of the present disclosure.
[30] Skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the drawings may be exaggerated relative to other elements to help improve understanding of embodiments of the present disclosure.
DETAILED DESCRIPTION
[31] While the disclosure is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the Figures and are described in detail below. However, it should be understood that it is not intended to limit the disclosure to the particular forms disclosed, on the contrary, the disclosure is to cover all modifications, equivalents, and alternatives falling within the scope of the disclosure as defined by the appended claims.
[32] Before describing detailed embodiments, it may be observed that the novelty and inventive step that are in accordance with the present disclosure resides in an ej ector system and a multistage ejector system. It is to be noted that a person skilled in the art can be motivated by the present disclosure and modify the various constructions of the device. However, such modification should be construed within the scope of the present disclosure. Accordingly, the drawings show only those specific details that are pertinent to understanding the embodiments of the present disclosure so as not to obscure the

disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.
[33] In the present disclosure, the term "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment or implementation of the present subject matter described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
[34] The terms "comprises", "comprising", or any other variations thereof, are intended to cover non-exclusive inclusions, such that a device that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such setup or device. In other words, one or more elements in a system or apparatus proceeded by "comprises... " does not, without more constraints, preclude the existence of other elements or additional elements in the system or apparatus.
[35] The terms like "at least one" and "one or more" may be used interchangeably or in combination throughout the description.
[36] Embodiments of the present disclosure disclose an ejector system and a multistage ejector system that ensures condensation of a mixture of a stream and a high-pressure motive fluid. The ejector system includes an ejector having a primary nozzle defined with a primary inlet and a primary outlet, a secondary nozzle defined with a secondary inlet and a secondary outlet, the secondary nozzle fluidly coupled to the primary nozzle through the primary outlet, a heat exchanger enclosing at least a portion of the secondary nozzle for heat exchange therebetween, wherein an inlet passage of the heat exchanger is fluidly connected to the secondary outlet of the secondary nozzle and a condenser disposed in fluid communication with an outlet passage of the heat exchanger. Further, the multistage ejector system includes a plurality of ejector systems. Each of the plurality of ejector systems have a similar structure as described above in this paragraph. Accordingly, the ejector system and the multistage ejector system ensure condensation of a mixture of a stream and a high-pressure motive fluid and reduction in the requirement of fluid for cooling in a condenser. This leads to saving the said fluid for cooling and reduction of size of condenser and makes the processes

of process industries economical. Further, the ejector system is robust, reliable, and durable.
[37] Further, in the description of the present disclosure, the term 'ejector system' as used herein collectively refers to the ejector (including the primary nozzle and the secondary nozzle), the piping, condenser, heat exchanger and the like. However, it is also to be noted that, the term 'ejector' as used herein refers to the ejector of the present disclosure including the primary nozzle and the secondary nozzle, with or without the condenser. Furthermore, in an embodiment, the ejector system may have a condenser fluidly coupled thereto. However, in another embodiment, the ejector system may not include the condenser.
[38] Reference will now be made to the exemplary embodiments of the disclosure, as illustrated in the accompanying drawings. Wherever possible, the same numerals will be used to refer to the same or like parts. Embodiments of the disclosure are described in the following paragraphs with reference to Figures 1 to 5. In Figures 1 to 5, the same element or elements which have the same functions are indicated by the same reference signs.
[39] Referring to Figures 1 to 5, an ejector system (100) and a multistage ejector system (200), according to an embodiment of the present disclosure, are depicted. The primary function of the ejector system (100) is to create a vacuum in a vacuum unit of process industries and increase the pressure of a stream (2) received from the vacuum unit by mixing a high-pressure motive fluid into the stream (2). The ejector system (100) of the present disclosure is designed to condensate the mixture of the stream (2) and the high-pressure motive fluid. The ejector system (100) is an arrangement of nozzles that allows the stream (2) and the high-pressure motive fluid to flow therethrough. The stream (2) may be a combination of steam and hydrocarbons that is discharged from the vacuum unit of the process industry and received the said stream by the ejector system (100). The high-pressure motive fluid may be a steam (1) that is flowed through the ejector system (100). The ejector system (100) is also capable to evacuate a portion of the mixture of the stream (2) and steam due to its compressible fluid properties at the exit of primary nozzle being at high mach number produces low pressure and low temperatures which causes cooling down or sometimes (1) frozen out

at walls of the ejector system (100) while condensing the mixture of stream and steam by means of a process of exchanging heat.
[40] Referring to Figure 1, the ejector system (100) includes a primary nozzle (3) and a secondary nozzle (7). The primary nozzle (3) is fluidly connected to the secondary nozzle (7). Alternatively, the primary nozzle (3) and the secondary nozzle (7) may be integrally formed to have a unitary structure. The secondary nozzle (7) is positioned substantially coaxial relative to the primary nozzle (3). The primary nozzle (3) is enclosed by an enclosure (19), as shown in Figure 2. The enclosure (19) is in fluid communication with a stream inlet (15) to receive the stream (2) from the vacuum unit of the process industry. The enclosure (19) is in fluid communication with the secondary nozzle (7) to supply the stream (2) to the secondary nozzle (7).
[41] Referring to Figure 1, the primary nozzle (3) is defined with a primary inlet (3a) and a primary outlet (3b). The primary inlet (3a) of the primary nozzle (3) is configured to allow the steam (1) to enter the primary nozzle (3). The primary outlet (3b) of the primary nozzle (3) is configured to allow the steam (1) to exit from the primary nozzle (3). The primary nozzle (3) includes a primary convergent section (4), a primary throat (5), and a primary divergent section (6). The primary convergent section (4) is in fluid communication with the primary throat (5). The primary throat (5) is in fluid communication with the primary divergent section (6). The primary convergent section (4), the primary throat (5), and the primary divergent section (6) are fluidly connected to each other to flow the steam (1) from the primary convergent section (4) to the primary divergent section (6) via the primary throat (5).
[42] The primary convergent section (4) includes the primary inlet (3a) that is defined at one end portion of the primary convergent section (4) to receive the steam (1) in the primary convergent section (4). The primary convergent section (4) has the other end portion that is fluidly connected to the primary throat (5). The primary throat (5) is further connected to one end portion of the primary divergent section (6). The primary divergent section (6) has the other end that defines the primary outlet (3b) of the primary nozzle (3) to exit the steam (1) from the primary nozzle (3) in order to transfer the steam (1) to the secondary nozzle (7).

[43] Referring to Figure 1, the secondary nozzle (7) is defined with a secondary inlet (7a), a duct (18), and a secondary outlet (7b). The secondary nozzle (7) is fluidly coupled to the primary nozzle (3) through the primary outlet (3b). The secondary inlet (7a) of the secondary nozzle (7) is configured to receive the steam (1) from the primary outlet (3b) of the primary nozzle (3). In an embodiment, the secondary inlet (7a) of the secondary nozzle (7) includes at least one of a single inlet and a plurality of inlets. In an embodiment, the secondary inlet (7a) is positioned at least one of substantially perpendicular, substantially parallel, and inclined, relative to the primary inlet (3a) of the primary nozzle (3). The duct (18) encloses at least a portion of the primary nozzle (3). The duct (18) has a plurality of apertures that are in fluid communication with the enclosure to receive the stream (2) in the secondary nozzle (7) so that the stream (2) can be mixed with the steam received from the primary nozzle (3). The secondary outlet (7b) of the secondary nozzle (7) is configured to allow the mixture of the stream (2) and the steam to exit from the secondary nozzle (7). The secondary nozzle (7) includes a secondary convergent section (8), a secondary throat (9), and a secondary divergent section (10). The secondary convergent section (8) is fluidly coupled to the secondary inlet (7a) through the duct. The secondary throat (9) is in fluid communication with the secondary convergent section (8), and the secondary divergent section (10) is in fluid communication with the secondary throat (9). The secondary convergent section (8), the secondary throat (9), and the secondary divergent section (10) are fluidly connected to each other to flow the mixture of stream (2) and steam from the secondary convergent section (8) to the secondary divergent section (10) via the secondary throat (9).
[44] Referring to Figure 2, the duct (18) includes the secondary inlet (7a) that is connected to a first end portion of the secondary convergent section (8) to receive the steam (1) in the secondary convergent section (8). The duct is defined as a surface area between the secondary inlet (7a) and the first end portion of the secondary convergent section (8), thereby volume at the first end portion of the secondary convergent section (8) is greater than volume of the secondary inlet (7a) in order to exponentially reduce the temperature of the steam and/or the mixture of stream and steam. The secondary convergent section (8) has a second end portion that is fluidly connected to the secondary throat (9). The secondary throat (9) is further fluidly connected to one end portion of the secondary divergent section (10). The secondary divergent section (10)

has the other end that defines the second outlet of the secondary nozzle (7) to exit the mixture of stream and steam from the secondary nozzle (7).
[45] Referring to Figure 3, the ejector system includes a condenser (17). The condenser (17) is in fluid communication with the secondary outlet (7b) of the secondary nozzle (7). The condenser (17) is configured to condense the mixture of stream and steam received from the secondary outlet (7b) of the secondary nozzle (7).
[46] In operation, when the steam flows from the primary inlet (3a) of the primary nozzle (3) to the primary outlet (3b) of the secondary nozzle (7), mirror variations in the temperature of the steam (1) are occurred, whereas when the steam enters in the secondary convergent section (8) of the secondary nozzle (7) through the secondary inlet (7a), and at the same time, the stream (2) from the enclosure is received the secondary convergent section (8) of the secondary nozzle (7). In the secondary convergent section (8) of the secondary nozzle (7), both (the stream (2) and the steam) get mixed and the temperature of the mixture of stream and steam gets reduced as explained earlier. The degree of variations in the temperature of the steam (1) depends on change in volume of the secondary convergent section (8), the secondary throat (9), and the secondary divergent section (10) through which the mixture of stream and steam flows and the quality of steam.
[47] Referring back to Figure 1, the ejector (1) includes the heat exchanger (11) that is configured to evacuate a portion of the mixture of stream and steam at the walls of the secondary nozzle (7) by the process of heat exchange. The heat exchanger (11) includes an internal surface that is defined with projections configured to increase surface area for heat exchange between the heat exchanger (11) and the portion of the secondary nozzle (7) enclosed by the heat exchanger (11). The heat exchanger (11) encloses at least one portion of the secondary nozzle (7) of the ejector (1). The heat recovery chamber (11) encloses at least one portion of the secondary convergent section (8), and the secondary throat (9) of the secondary nozzle (7). The heat exchanger (11) defines a fluid section over an outer surface of the secondary nozzle (7) at least one portion of the secondary convergent section (8), and the secondary throat (9) of the secondary nozzle (7). The fluid section is defined as to flow of a fluid over the said

outer surface of the secondary nozzle (7) so that the heat can be exchanged between the fluid (14) and the mixture of stream and steam.
[48] Referring-back to Figure 2, the heat exchanger (11) includes an inlet passage
(12) and an outlet passage (13). The inlet passage (12) and the outlet passage (13) are
defined on a single wall of the heat recovery chamber (11) to receive the fluid (14) in
the heat exchanger (11), as shown in Figures 1 and 2. In an alternate embodiment, the
inlet passage (12) and the outlet passage (13) may be defined on different walls of the
heat recovery chamber (11) to exit the fluid (14) from the heat exchanger (11), as shown
in Figure 3. The fluid (14) flows over the outer surface of at least one portion of the
secondary nozzle (7) of the ejector (1) for exchanging heat between the fluid (14) and
the mixture of stream and steam in order to reduce the temperature of the walls of the
secondary nozzle (7).

We claim:

1. An ejector system (100), comprising:
a primary nozzle (3) defined with a primary inlet (3a) and a primary outlet (3b);
a secondary nozzle (7) defined with a secondary inlet (7a) and a secondary outlet (7b), the secondary nozzle (7) fluidly coupled to the primary nozzle (3) through the primary outlet (3b); and
a heat exchanger (11) enclosing at least a portion of the secondary nozzle (7) for heat exchange therebetween, wherein an inlet passage (12) of the heat exchanger (11) is fluidly connected to the secondary outlet (7b) of the secondary nozzle (7); and
a condenser (17) disposed in fluid communication with an outlet passage (13) of the heat exchanger (11).
2. The ejector system (100) as claimed in claim 1, wherein the condenser (17) is fluidly connected to the secondary outlet (7b) of the secondary nozzle (7), and wherein the fluid (14) discharged from the secondary outlet (7b) is selectively routed to at least one of the heat exchanger (11) and the condenser (17).
3. The ejector system (100) as claimed in claim 1, wherein the primary nozzle (3) comprises:
a primary convergent section (4) including the primary inlet (3a);
a primary throat (5) in fluid communication with the primary convergent section (4); and
a primary divergent section (6) in fluid communication with the primary throat (5).
4. The ejector system (100) as claimed in claim 1, wherein the secondary nozzle
(7) comprises:
a duct (18) enclosing at least a portion of the primary nozzle (3), the duct including the secondary inlet (7a);
a secondary convergent section (8) fluidly coupled to the secondary inlet (7a) through the duct;
a secondary throat (9) in fluid communication with the secondary convergent section (8); and

a secondary divergent section (10) in fluid communication with the secondary throat (9).
5. The ejector system (100) as claimed in claim 4, wherein the heat exchanger (11) encloses at least one of the secondary convergent section (8) and at least a portion of the secondary throat (9).
6. The ejector system (100) as claimed in claim 1, wherein an internal surface of the heat exchanger (11) is defined with projections configured to increase surface area for heat exchange between the heat exchanger (11) and the portion of the secondary nozzle (7) enclosed by the heat exchanger (11).
7. The ejector system (100) as claimed in claim 1, wherein the secondary nozzle (7) is positioned substantially coaxial relative to the primary nozzle (3), and wherein the secondary inlet (7a) of the secondary nozzle (7) comprises at least one of a single inlet and a plurality of inlets.
8. The ejector system (100) as claimed in claim 7, wherein the secondary inlet (7a) is positioned at least one of substantially perpendicular, substantially parallel, and inclined, relative to the primary inlet (3a) of the primary nozzle (3).
9. A multistage ejector system (200), comprising:
A plurality of ejector systems (100), wherein each of the plurality of ejector system (100) comprises:
a primary nozzle (3) defined with a primary inlet (3a) and a primary outlet (3b);
a secondary nozzle (7) defined with a secondary inlet (7a) and a secondary outlet (7b), the secondary nozzle (7) fluidly coupled to the primary nozzle (3) through the primary outlet (3b); and
a heat exchanger (11) enclosing at least a portion of the secondary nozzle (7) for heat exchange therebetween, wherein an inlet passage (12) of the heat exchanger (11) is fluidly connected to the secondary outlet (7b) of the secondary nozzle (7); and
a condenser (17) disposed in fluid communication with an outlet passage (13) of the heat exchanger (11); and

at least one conduit (20) fiuidly connecting the plurality of ejector systems for fluid flow therebetween.
10. The multistage ejector system (200) as claimed in claim 9, wherein the at least one conduit (20) fiuidly connects an outlet passage (13) of a first heat exchanger (11) of a first ejector system with an inlet passage of a second heat exchanger (11) of a second ejector system.