LNG (Liquefied Natural Gas) cold energy utilization device and method
By designing a multi-stage heat exchange LNG cooling energy utilization device, the waste problem caused by single cold energy utilization in the prior art is solved, and the ladder utilization and efficient utilization of cold energy are achieved.
Patent Information
- Application Number
- CN202411521974.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-02-07
AI Technical Summary
In the prior art, LNG cold energy is used in a single way, resulting in the inability to effectively utilize the cold energy value in different temperature ranges, resulting in waste of cold energy.
A LNG cooling energy utilization device is designed, including a power generation module, an ice-making module and an air-conditioning module. Through a multi-stage heat exchange process, the cooling capacity of LNG is utilized step by step, and is used for power generation, ice-making and air-conditioning respectively.
The step-by-step utilization of cold energy is realized, the utilization rate of cold energy is improved, and the applicability is strong, and the waste of cold energy is avoided.
Smart Images
Figure CN119393210A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of LNG cold energy cascade utilization, and in particular, relates to a LNG cold energy utilization device and method. Background Art
[0002] LNG cold energy has valuable high-grade energy. The gasification process of LNG (-162℃) will release a large amount of cold energy, about 830kJ / kg. However, the quality of LNG cold energy is relatively wide, and the value of cold energy in different temperature ranges varies greatly. The corresponding optimal temperature range cold energy utilization methods are different, but if only a single utilization form is adopted, it will inevitably cause waste of cold energy in other temperature ranges. Summary of the invention
[0003] In view of the above-mentioned technical problems existing in the prior art, the present application provides an LNG cold energy utilization device and method.
[0004] The technical solution adopted in the embodiment of the present application is:
[0005] An LNG cold energy utilization device, comprising:
[0006] A power generation module, comprising at least a first condenser, a generator, and a first evaporator, wherein the first condenser has a first natural gas pipeline and a first intermediate medium pipeline capable of heat exchange; the inlet of the first intermediate medium pipeline is connected to the working medium steam outlet of the generator, the outlet of the first intermediate medium pipeline is connected to the intermediate medium inlet of the first evaporator, and the intermediate medium outlet of the first evaporator is connected to the working medium steam inlet of the generator;
[0007] The ice-making module comprises at least a second condenser and an ice-making assembly, wherein the second condenser has a second natural gas pipeline and a second intermediate medium pipeline capable of heat exchange; the inlet of the second natural gas pipeline is connected to the outlet of the first natural gas pipeline, and the second intermediate medium pipeline is connected to the cooling medium channel in the ice-making assembly;
[0008] The air conditioning module comprises at least a third condenser and an air conditioning component. The third condenser is provided with a third natural gas pipeline and a third intermediate medium pipeline capable of heat exchange. The inlet of the third natural gas pipeline is connected to the outlet of the second natural gas pipeline, and the third intermediate medium pipeline is connected to the cooling medium channel in the air conditioning component.
[0009] Further, the first evaporator comprises:
[0010] Box, open at both ends;
[0011] A heat exchange coil, disposed in the box, and used to connect the outlet of the first intermediate medium pipeline and the working medium steam inlet of the generator;
[0012] The first fan is arranged at the first open end of the box body and is used for blowing air into the box body to exchange heat with the heat exchange coil.
[0013] Further, the first evaporator also includes:
[0014] The grille covers the second open end of the box body and is connected to the box body.
[0015] Furthermore, the heat exchange coil includes a liquid inlet pipe, a liquid outlet pipe, an intermediate pipe and a heat exchange tube respectively connected to the liquid inlet pipe, the liquid outlet pipe and the intermediate pipe, the liquid inlet pipe and the liquid outlet pipe are respectively arranged on the first side wall of the box body, the intermediate pipe is arranged on the second side wall of the box body, the first side wall and the second side wall are opposite to each other, the heat exchange tube is located between the first side wall and the second side wall of the box body, and the intermediate pipe is provided with an exhaust port and a sewage outlet.
[0016] Furthermore, the first evaporator also includes a support frame, which is arranged at the bottom of the box body and can be adjusted in height.
[0017] Furthermore, the ice-making assembly includes a second evaporator and a filter, the cooling medium channel of the second evaporator is connected to the second intermediate medium pipeline, the filter is connected to the second evaporator, and the pure water filtered by the filter can enter the second steam generator and exchange heat with the cooling medium in the cooling medium channel of the second evaporator to form ice cubes.
[0018] Furthermore, the air conditioning component includes a third evaporator and a fan, the cooling medium channel of the third evaporator is connected to the third intermediate medium pipeline, and the normal temperature wind blown out by the fan can enter the third steam generator and exchange heat with the cooling medium in the cooling medium channel of the third evaporator to form cold air.
[0019] Furthermore, the first condenser, the second condenser and the third condenser are all shell and tube heat exchangers.
[0020] Furthermore, the generator is a magnetically suspended turbine expansion generator.
[0021] A method for utilizing an LNG cold energy utilization device based on any one of the above embodiments includes the following process:
[0022] LNG enters the first natural gas pipeline and performs heat exchange with the first intermediate medium pipeline, so that the LNG is converted into NG, and the first intermediate medium flowing in the first intermediate medium pipeline is converted into saturated working medium steam, and the saturated working medium steam enters the generator to work;
[0023] The NG discharged from the first natural gas pipeline enters the second natural gas pipeline and exchanges heat with the second intermediate medium flowing in the second intermediate medium pipeline to reduce the temperature of the second intermediate medium;
[0024] The NG discharged through the first natural gas pipeline enters the third natural gas pipeline and exchanges heat with the third intermediate medium flowing in the third intermediate medium pipeline to reduce the temperature of the third intermediate medium.
[0025] Compared with the prior art, the beneficial effects of the embodiments of the present application are:
[0026] The LNG cold energy utilization device of the present application uses the cold energy generated by LNG gasification to provide the power generation module with cold energy for condensing the power generation cycle working medium. After passing through the power generation module, NG enters the ice making module, and the cold energy of NG provides the ice making module with the cold energy required by the ice making cycle working medium. After passing through the ice making module, NG enters the air conditioning module, and the cold energy of NG provides the air conditioning module with the cold energy required by the air conditioning cycle working medium. The cold energy utilization device can realize the step-by-step utilization of cold energy, has a high cold energy utilization rate, and is highly applicable.
[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.
[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of the LNG cold energy utilization device according to an embodiment of the present application;
[0030] Figure 2 This is a front view of the first evaporator of the embodiment of the present application;
[0031] Figure 3 This is a test diagram of the first evaporator in the embodiment of the present application;
[0032] Figure 4 A top view of the first evaporator in the embodiment of the present application;
[0033] Figure 5 This is a flow chart of the LNG cold energy utilization method according to an embodiment of the present application.
[0034] In the figure: 1. first evaporator; 100. housing; 101. medium inlet; 102. medium outlet; 103. exhaust port; 104. sewage outlet; 105. heat exchange coil; 106. first fan; 107. support frame; 2. first condenser; 3. first working fluid pump; 4. generator; 5. second condenser; 6. second working fluid pump; 7. second evaporator; 8. third condenser; 9. third working fluid pump; 10. third evaporator; 11. second fan; 12. power generation module; 13. ice making module; 14. air conditioning module; 15. filter. DETAILED DESCRIPTION
[0035] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present application, the present application is described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0036] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0037] like Figure 1 As shown, an embodiment of the present application provides an LNG cold energy utilization device, which mainly includes a power generation module 12, an ice making module 13 and an air conditioning module 14.
[0038] The power generation module 12 at least comprises a first condenser 2, a generator 4, and a first evaporator 1. The first condenser 2 has a first natural gas pipeline and a first intermediate medium pipeline capable of exchanging heat.
[0039] The inlet of the first intermediate medium pipeline is connected to the working medium steam outlet of the generator 4 , the outlet of the first intermediate medium pipeline is connected to the intermediate medium inlet of the first evaporator 1 , and the intermediate medium outlet of the first evaporator 1 is connected to the working medium steam inlet of the generator 4 .
[0040] The first intermediate medium flowing through the first intermediate medium pipeline may be propane, pentafluoropropane, ethylene, etc. The first intermediate medium is heat exchanged through the first evaporator 1 to form saturated working medium vapor, which enters the generator 4 for work, and the worked working medium vapor enters the first condenser 2 for heat exchange and condensation with the LNG flowing through the first natural gas pipeline, and the condensed liquid working medium enters the first evaporator 1 again, completing the closed cycle of the first intermediate medium.
[0041] The ice-making module 13 at least includes a second condenser 5 and an ice-making assembly. The second condenser 5 has a second natural gas pipeline and a second intermediate medium pipeline capable of heat exchange, the inlet of the second natural gas pipeline is connected to the outlet of the first natural gas pipeline, and the second intermediate medium pipeline is connected to the cooling medium channel in the ice-making assembly.
[0042] The second intermediate medium flowing in the second intermediate medium pipeline may be ethylene glycol solution, Freon, etc. The second intermediate medium exchanges heat with the NG flowing into the second natural gas pipeline. Specifically, the second intermediate medium further absorbs the cold energy released by the NG and lowers its temperature. The second intermediate medium with lowered temperature enters the ice-making component to provide cold energy for ice making.
[0043] The air conditioning module 14 at least includes a third condenser 8 and an air conditioning assembly. The third condenser 8 has a third natural gas pipeline and a third intermediate medium pipeline capable of heat exchange, the inlet of the third natural gas pipeline is connected to the outlet of the second natural gas pipeline, and the third intermediate medium pipeline is connected to the cooling medium channel in the air conditioning assembly.
[0044] Among them, the third intermediate medium circulating in the third intermediate medium pipeline can be ethylene glycol solution or Freon, etc. The third intermediate medium exchanges heat with the NG flowing into the third natural gas pipeline. Specifically, the third intermediate medium further absorbs the cold energy released by the NG and lowers its temperature. The third intermediate medium with lowered temperature enters the air-conditioning component to provide cold energy for the refrigeration of the air-conditioning component.
[0045] In addition, the outlet of the third natural gas pipeline can be connected to an external transmission pipeline, or other modules that can further utilize NG cold energy.
[0046] The LNG cold energy utilization device of the present application uses the cold energy generated by LNG gasification to provide the power generation module 12 with cold energy for condensing the power generation cycle working medium. After passing through the power generation module 12, NG enters the ice making module 13, and the cold energy of NG provides the ice making cycle working medium required by the ice making module 13. After passing through the ice making module 13, NG enters the air conditioning module 14, and the cold energy of NG provides the air conditioning cycle working medium required by the air conditioning module 14. The cold energy utilization device can realize the step-by-step utilization of cold energy, has a high cold energy utilization rate, and is highly applicable.
[0047] like Figure 1As shown, in some embodiments, the outlet of the first intermediate medium pipeline in the first condenser 2 and the intermediate medium inlet of the first evaporator 1 are connected via a first working fluid pump 3, the second intermediate medium pipeline in the second condenser 5 and the cooling medium channel in the ice-making assembly are connected via a second working fluid pump 6, and the third intermediate medium pipeline in the third condenser 8 and the cooling medium channel in the ice-making assembly are connected via a third working fluid pump 9.
[0048] The first working fluid pump 3, the second working fluid pump 6 and the third working fluid pump 9 can all adopt shielded variable frequency pumps to avoid leakage, do not require lubricating oil, avoid contaminating the working fluid, the motor and the pump are coaxially integrated, small in size, light in weight, occupying a small area, easy to disassemble, and do not require a cooling system, and have low operating noise.
[0049] In addition, in some embodiments, the first condenser 2, the second condenser 5 and the third condenser 8 can all adopt shell and tube heat exchangers, which have simple structure, good strength and strong sealing. Among them, LNG or NG can flow in the tube side of the condenser, and the intermediate medium can flow in the shell side of the condenser.
[0050] In some embodiments, the generator 4 in the power generation module 12 can adopt a magnetically suspended turbine expansion generator, with an impeller directly connected to a high-speed generator, and use magnetic bearings to reduce bearing friction losses without the need for lubricating oil, thereby avoiding the risk of contaminating the working fluid.
[0051] like Figures 2 to 4 As shown, in some embodiments, the first evaporator 1 at least includes a housing 100 and a heat exchange coil 108 and a first fan 106 respectively disposed on the housing 100 .
[0052] The box 100 is open at both ends and has a cylindrical structure as a whole. The heat exchange coil 108 is fixed in the box 100 and is used to connect the outlet of the first intermediate medium pipeline and the working medium steam inlet of the generator 4 .
[0053] The first fan 106 is disposed at the first open end of the box body 100 and is used for blowing air into the box body 100 to exchange heat with the heat exchange coil 108. The first fan 106 is used for air heat exchange and accelerates the air flow to achieve the purpose of exchanging heat with the first intermediate medium in the heat exchange tube to gasify it, thereby improving the heat exchange efficiency of the circulating working medium.
[0054] In some embodiments, the first evaporator 1 may further include a grille, which covers the second open end of the housing 100 and is connected to the housing 100. The grille is generally composed of a group of parallel bars, and the grille covers the housing 100 to prevent foreign matter from invading the first fan 106.
[0055] In some embodiments, the heat exchange coil 108 includes a liquid inlet pipe, a liquid outlet pipe, an intermediate pipe, and heat exchange pipes respectively connected to the liquid inlet pipe, the liquid outlet pipe, and the intermediate pipe.
[0056] The liquid inlet pipe and the liquid outlet pipe are respectively arranged on the first side wall of the box body 100, and the intermediate pipe is arranged on the second side wall of the box body 100. The first side wall and the second side wall are opposite, and the heat exchange pipe is located between the first side wall and the second side wall of the box body 100. The outlet of the first intermediate medium pipeline is connected to the medium inlet 101 on the liquid inlet pipe, and the working medium steam inlet on the generator 4 is connected to the medium outlet 102 on the liquid outlet pipe.
[0057] After entering the liquid inlet pipe, the first intermediate medium can flow into the heat exchange tube and then into the intermediate tube, then flow back into the heat exchange tube through the intermediate tube, and finally be discharged through the liquid outlet pipe.
[0058] In some embodiments, an exhaust port 103 and a sewage port 104 are provided on the intermediate tube. When the pressure in the heat exchange tube is high, the working fluid in the heat exchange tube can be discharged in an appropriate amount through the exhaust port 103. The sewage port 104 is provided on the intermediate tube at the bottom of the exhaust port 103 to discharge impurities in the heat exchange tube.
[0059] In some embodiments, the medium inlet 101 on the liquid inlet pipe may be connected to a filter screen, and impurities entering the liquid inlet pipe may be filtered through the filter screen.
[0060] The heat exchange tube can be wound into a serpentine tube and arranged in the box body 100 or wound into multiple layers of serpentine tubes and arranged in the box body 100, which can increase the heat exchange efficiency.
[0061] In some embodiments, the first evaporator 1 further includes a support frame 107 , which is disposed at the bottom of the box body 100 . The support frame 107 can be adjusted in height to be suitable for various venues.
[0062] The ice-making assembly includes a second evaporator 7 and a filter 15 , and a cooling medium channel of the second evaporator 7 is connected to a second intermediate medium pipeline.
[0063] The filter 15 is connected to the second evaporator 7 , and the pure water filtered by the filter 15 can enter the second evaporator 7 to exchange heat with the cooling medium in the cooling medium channel of the second evaporator 7 to form ice cubes.
[0064] In some embodiments, the air conditioning component includes a third evaporator 10 and a second fan 11. The cooling medium channel of the third evaporator 10 is connected to the third intermediate medium pipeline. The normal temperature air blown out by the second fan 11 can enter the third evaporator 10 and exchange heat with the cooling medium in the cooling medium channel of the third evaporator 10 to form cold air.
[0065] In some embodiments, the first condenser 2, the second condenser 5 and the third condenser 8 are all shell and tube heat exchangers with simple structure, good strength and strong sealing.
[0066] In some embodiments, the generator 4 is a magnetically suspended turbine expansion generator, which uses an impeller directly connected to a high-speed generator and uses magnetic bearings to reduce bearing friction losses without the need for lubricating oil, thereby avoiding the risk of contaminating the working fluid.
[0067] like Figure 5 As shown, an embodiment of the present invention further provides a method for utilizing an LNG cold energy utilization device based on any one of the above embodiments, and the method comprises the following process:
[0068] Step S100: NG enters the first intermediate medium pipeline in the first natural gas pipeline for heat exchange, so that LNG is converted into NG, and the first intermediate medium flowing in the first intermediate medium pipeline is converted into saturated working medium steam. The saturated working medium steam then enters the generator 4 for work;
[0069] Furthermore, the processed working medium vapor enters the first condenser 2 to exchange heat with LNG and condense. The condensed liquid working medium is transported to the first evaporator 1 through the first working medium pump 3, completing the closed cycle of the working medium.
[0070] Step S200: NG discharged from the first natural gas pipeline enters the second natural gas pipeline and exchanges heat with the second intermediate medium flowing in the second intermediate medium pipeline to reduce the temperature of the second intermediate medium;
[0071] Specifically, the second intermediate medium after the temperature is reduced enters the second evaporator 7 in the ice-making assembly, exchanges heat with the pure water filtered by the filter 15 to complete ice making, and then enters the second heater to complete the closed cycle.
[0072] Step S300: NG discharged from the first natural gas pipeline enters the third natural gas pipeline and exchanges heat with the third intermediate medium flowing in the third intermediate medium pipeline to reduce the temperature of the third intermediate medium.
[0073] Specifically, the third intermediate medium after the temperature is reduced enters the third evaporator 10 in the air conditioning component to convert the normal temperature air blown by the second fan 11 into cold air, and the cold air is transported to the air conditioning system. The third intermediate medium enters the third condenser 8 to complete the closed cycle.
[0074] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.
Claims
1. An LNG cold energy utilization device, characterized in that: include: The power generation module comprises at least a first condenser, a generator, and a first evaporator, wherein the first condenser has a first natural gas pipeline and a first intermediate medium pipeline capable of heat exchange; The inlet of the first intermediate medium pipeline is connected to the working medium steam outlet of the generator, the outlet of the first intermediate medium pipeline is connected to the intermediate medium inlet of the first evaporator, and the intermediate medium outlet of the first evaporator is connected to the working medium steam inlet of the generator; The ice-making module comprises at least a second condenser and an ice-making assembly, wherein the second condenser has a second natural gas pipeline and a second intermediate medium pipeline capable of heat exchange; the inlet of the second natural gas pipeline is connected to the outlet of the first natural gas pipeline, and the second intermediate medium pipeline is connected to the cooling medium channel in the ice-making assembly; The air conditioning module comprises at least a third condenser and an air conditioning component. The third condenser is provided with a third natural gas pipeline and a third intermediate medium pipeline capable of heat exchange. The inlet of the third natural gas pipeline is connected to the outlet of the second natural gas pipeline, and the third intermediate medium pipeline is connected to the cooling medium channel in the air conditioning component.
2. The LNG cold energy utilization device according to claim 1, characterized in that: The first evaporator comprises: Box, open at both ends; A heat exchange coil, disposed in the box, and used to connect the outlet of the first intermediate medium pipeline and the working medium steam inlet of the generator; The first fan is arranged at the first open end of the box body and is used for blowing air into the box body to exchange heat with the heat exchange coil.
3. The LNG cold energy utilization device according to claim 2, characterized in that: The first evaporator also includes: The grille covers the second open end of the box body and is connected to the box body.
4. The LNG cold energy utilization device according to claim 2, characterized in that: The heat exchange coil includes a liquid inlet pipe, a liquid outlet pipe, an intermediate pipe and a heat exchange tube respectively connecting the liquid inlet pipe, the liquid outlet pipe and the intermediate pipe. The liquid inlet pipe and the liquid outlet pipe are respectively arranged on the first side wall of the box body, and the intermediate pipe is arranged on the second side wall of the box body. The first side wall and the second side wall are opposite to each other. The heat exchange tube is located between the first side wall and the second side wall of the box body, and the intermediate pipe is provided with an exhaust port and a sewage outlet.
5. The LNG cold energy utilization device according to claim 1, characterized in that: The first evaporator further comprises a support frame, which is arranged at the bottom of the box body and can be adjusted in height.
6. The LNG cold energy utilization device according to claim 1, characterized in that: The ice-making assembly includes a second evaporator and a filter. The cooling medium channel of the second evaporator is connected to the second intermediate medium pipeline. The filter is connected to the second evaporator. Pure water filtered by the filter can enter the second steamer and exchange heat with the cooling medium in the cooling medium channel of the second evaporator to form ice cubes.
7. The LNG cold energy utilization device according to claim 1, characterized in that: The air conditioning component includes a third evaporator and a second fan. The cooling medium channel of the third evaporator is connected to the third intermediate medium pipeline. The normal temperature wind blown out by the second fan can enter the third steam generator and exchange heat with the cooling medium in the cooling medium channel of the third evaporator to form cold air.
8. The LNG cold energy utilization device according to claim 1, characterized in that: The first condenser, the second condenser and the third condenser are all shell and tube heat exchangers.
9. The LNG cold energy utilization device according to claim 1, characterized in that: The generator is a magnetically suspended turbine expansion generator.
10. A method for utilizing the LNG cold energy utilization device according to any one of claims 1 to 9, characterized in that: include: LNG enters the first natural gas pipeline and performs heat exchange with the first intermediate medium pipeline, so that the LNG is converted into NG, and the first intermediate medium flowing in the first intermediate medium pipeline is converted into saturated working medium steam, and the saturated working medium steam enters the generator to work; The NG discharged from the first natural gas pipeline enters the second natural gas pipeline and exchanges heat with the second intermediate medium flowing in the second intermediate medium pipeline to reduce the temperature of the second intermediate medium; The NG discharged through the first natural gas pipeline enters the third natural gas pipeline and exchanges heat with the third intermediate medium flowing in the third intermediate medium pipeline to reduce the temperature of the third intermediate medium.