Low-temperature liquefied fuel power generation device

Abstract

The utility model provides a low-temperature liquefied fuel power generation device which is characterized in that the low-temperature liquefied fuel power generation device comprises a gas generator, a first heat exchange device, a second heat exchange device, a working medium pump and a waste heat recovery power generation device, and the first heat exchange device, the working medium pump, the second heat exchange device and the waste heat recovery power generation device are sequentially connected end to end through pipelines to form a working medium circulation pipeline; the first heat exchange device is further connected with an external fuel source and a gas generator through pipelines. The second heat exchange device is further connected with the gas generator and the outside of the device through pipelines. The low-temperature liquefied fuel power generation device solves the problems that an existing device is low in energy utilization efficiency and large in thermal pollution to the environment, has the advantages of being high in energy utilization efficiency, small in thermal pollution and wide in application range, and can be used for a temporary power supply station and a fixed power supply station.

Description

Technical Field

[0001] The utility model relates to the field of power generation, in particular to a low-temperature liquefied fuel power generation device. Background Art

[0002] my country is rich in energy, but the per capita share is insufficient. With the improvement of people's living standards and the implementation of the national carbon neutrality strategic goal, gas-fired power generation has multiple advantages compared with coal-fired power generation. Most gas-fired generators today emit a large amount of high-temperature flue gas after burning fuel to generate electricity, and the power generation equipment also releases a large amount of waste heat into the environment. The energy utilization efficiency is low and thermal pollution is caused to the environment. It is urgent to improve energy utilization efficiency. In terms of gas-fired power generation, the waste heat generated after power generation can be recycled and utilized through the organic Rankine cycle to achieve the purpose of improving energy utilization efficiency and saving energy and reducing emissions. Utility Model Content

[0003] The main purpose of the utility model is to provide a low-temperature liquefied fuel power generation device, which overcomes the above technical problems.

[0004] In order to achieve the above purpose, the utility model proposes the following technical solutions:

[0005] A low-temperature liquefied fuel power generation device, characterized in that it comprises: a gas generator, a first heat exchange device, a second heat exchange device, a working fluid pump, and a waste heat recovery power generation device, wherein:

[0006] The first heat exchange device, the working fluid pump, the second heat exchange device, and the waste heat recovery power generation device are connected end to end in sequence through pipelines to form a working fluid circulation pipeline;

[0007] The first heat exchange device is also connected to an external fuel source and a gas generator through pipelines, and the fuel enters the first heat exchange device through the pipeline and is transported to the gas generator;

[0008] The second heat exchange device is also connected to the gas generator and the outside of the device through pipelines. The exhaust generated by the combustion of the gas generator 1 is transmitted to the second heat exchange device through the pipeline and discharged to the outside of the device through the second heat exchange device.

[0009] Furthermore, the gas generator adopts a gas turbine generator.

[0010] Furthermore, the gas generator adopts an internal combustion engine generator.

[0011] Furthermore, the first heat exchange device adopts a shell and tube heat exchanger, a plate heat exchanger, a fin heat exchanger or a plate and shell heat exchanger.

[0012] Furthermore, the second heat exchange device adopts a shell and tube heat exchanger, a plate heat exchanger, a fin heat exchanger or a plate and shell heat exchanger.

[0013] Furthermore, the second heat exchange device includes a first heat exchanger and a second heat exchanger.

[0014] The low-temperature liquefied fuel power generation device of the utility model solves the problems of low energy utilization efficiency and large thermal pollution caused to the environment of existing equipment. It has the advantages of high energy utilization efficiency, small thermal pollution and wide application range, and can be used for temporary power supply stations as well as fixed power supply stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 The utility model is a schematic diagram of the overall structure of a low-temperature liquefied fuel power generation device.

[0017] Figure 2 It is a schematic diagram of the overall structure of a preferred embodiment of the utility model.

[0018] The above drawings include the following reference numerals:

[0019] 1. Gas generator; 2. First heat exchange device; 3. Second heat exchange device; 4. Working fluid pump; 5. Waste heat recovery power generation device; 31. First heat exchanger; 32. Second heat exchanger. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0023] Reference below Figure 1 and Figure 2 , the utility model is further described as follows:

[0024] A low-temperature liquefied fuel power generation device, characterized in that it comprises: a gas generator 1, a first heat exchange device 2, a second heat exchange device 3, a working fluid pump 4, and a waste heat recovery power generation device 5, wherein:

[0025] The first heat exchange device 2, the working fluid pump 4, the second heat exchange device 3, and the waste heat recovery power generation device 5 are connected in sequence end to end through pipelines to form a working fluid circulation pipeline.

[0026] The first heat exchange device 2 is also connected to the external fuel source and the gas generator 1 through pipelines, and the fuel enters the first heat exchange device 2 through the pipeline and is transported to the gas generator 1;

[0027] The second heat exchange device 3 is also connected to the gas generator 1 and the outside of the device through pipelines. The exhaust generated by the combustion of the gas generator 1 is transmitted to the second heat exchange device 3 through the pipeline, and is discharged to the outside of the device through the second heat exchange device 3.

[0028] This device utilizes the organic Rankine cycle and uses low-boiling-point organic matter as the working fluid to achieve waste heat recovery and power generation.

[0029] The cryogenic liquid fuel passes through the first heat exchanger 2 , and absorbs heat during the gasification process of the cryogenic liquid fuel. The working fluid is condensed by utilizing the heat absorption process of the liquid fuel. The working fluid is changed from gas to liquid through the first heat exchanger 2 and is transported to the working fluid pump 4 .

[0030] The working fluid pump 4 provides the power required for the circulation of the working fluid in the entire circulation pipeline.

[0031] Optionally, the working fluid pump 4 is a working fluid pump with a head of 200 m.

[0032] The working medium passes through the second heat exchanger 3 , absorbs heat from the exhaust, and changes from liquid to gas, and is transported to the waste heat recovery power generation device 5 through a pipeline.

[0033] The waste heat recovery power generation device 5 utilizes the expansion of the working fluid to generate power, thereby achieving the purpose of recycling and utilizing waste heat and cold energy to generate power.

[0034] The gaseous working medium after expansion and work is continuously transported to the first heat exchanger 2 through the pipeline to carry out the next cycle process.

[0035] Specifically, the condenser uses LNG as a cold source. The LNG gasification process condenses the working fluid. After being gasified in the condenser, the LNG enters the generator, mixes with air and burns to generate electricity, generating 1000KW of electricity. The condensed working fluid is pressurized by the working fluid pump and enters the evaporator 1 to recover the heat energy in the cylinder jacket water, and then enters the evaporator 2 to recover the heat energy in the flue gas. At this time, the ORC working fluid reaches 2000KPa and 86℃. The working fluid generates electricity through the waste heat recovery power generation device 1, generating about 378KW of electricity. The working fluid after working enters the condenser, and the cycle continues. The thermal efficiency of power generation is increased to about 50.3%.

[0036] Optionally, the working fluid may be common refrigerants such as R12, R123, R134a, R152, R22, R32, R404a, R507, and R600.

[0037] In this embodiment, the gas generator 1 is a gas turbine generator, but may also be an internal combustion engine generator.

[0038] In a preferred embodiment, the rated power of the gas generator is 300KW-10000KW, and the fuel gas inlet pressure is 1-6 bar.

[0039] Optionally, the fuel used by the gas generator can be low-temperature liquefied fuel such as LNG, liquefied ethane, liquefied ethylene, liquefied propane, liquefied butane, etc. The advantage of such fuel is that it is small in size and easy to transport and replenish.

[0040] In this embodiment, the first heat exchange device 2 and the second heat exchange device 3 can both be shell and tube heat exchangers, plate heat exchangers, fin heat exchangers or plate and shell heat exchangers.

[0041] In actual application, a 1000KW gas generator burns natural gas to generate electricity, consuming about 300 standard cubic meters of natural gas per hour, and its thermal efficiency is about 36.5%. After natural gas combustion, it produces high-temperature flue gas with a temperature of about 300°C; the gas generator produces high-temperature cylinder jacket water with a temperature of about 90°C.

[0042] In a preferred embodiment, the second heat exchange device 3 includes a first heat exchanger 31 and a second heat exchanger 32. The first heat exchanger 31 is used to recover waste heat in high-temperature cylinder jacket water, and the second heat exchanger 32 is used to recover waste heat in flue gas, thereby improving heat recovery efficiency.

[0043] Preferably, the waste heat recovery power generation device 1 is made into a transportable skid, which can be used alone or multiple units can be connected in parallel as needed.

[0044] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0045] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0046] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0047] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A low temperature liquefied fuel power generation device, characterized in that: include: A gas generator (1), a first heat exchange device (2), a second heat exchange device (3), a working fluid pump (4), and a waste heat recovery power generation device (5), wherein: The first heat exchange device (2), the working fluid pump (4), the second heat exchange device (3), and the waste heat recovery power generation device (5) are connected end to end in sequence through pipelines to form a working fluid circulation pipeline; The first heat exchange device (2) is also connected to an external fuel source and the gas generator (1) through pipelines, respectively, and the fuel enters the first heat exchange device (2) through the pipeline and is transported to the gas generator (1); The second heat exchange device (3) is also connected to the gas generator (1) and the outside of the device through pipelines, and the exhaust generated by the combustion of the gas generator (1) is transmitted to the second heat exchange device (3) through the pipeline, and is discharged to the outside of the device through the second heat exchange device (3).

2. A low temperature liquefied fuel power generation device according to claim 1, characterized in that: The gas generator (1) is a gas turbine generator.

3. A low temperature liquefied fuel power generation device according to claim 1, characterized in that: The gas generator (1) is an internal combustion engine generator.

4. A low temperature liquefied fuel power generation device according to claim 1, characterized in that: The first heat exchange device (2) is a shell and tube heat exchanger, a plate heat exchanger, a fin heat exchanger or a plate and shell heat exchanger.

5. A low temperature liquefied fuel power generation device according to claim 1, characterized in that: The second heat exchange device (3) is a shell and tube heat exchanger, a plate heat exchanger, a fin heat exchanger or a plate and shell heat exchanger.

6. A low temperature liquefied fuel power generation device according to claim 1, characterized in that: The second heat exchange device (3) comprises a first heat exchanger (31) and a second heat exchanger (32).

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