Energy-saving system for cascade utilization of liquefied natural gas gasification cold energy

Abstract

The utility model discloses a kind of liquefied natural gas gasification cold energy cascade utilization energy-saving systems, belong to liquefied natural gas cold energy utilization technical field, including liquefied natural gas storage tank, gasification heat exchanger, cold storage pond, plate heat exchanger;Liquefied natural gas storage tank outlet is connected with liquefied natural gas delivery pump inlet, and liquefied natural gas delivery pump outlet is connected with gasification heat exchanger first medium inlet;Gasification heat exchanger is connected with cold storage pond;Plate heat exchanger is connected with energy storage pond, and the first medium inlet of plate heat exchanger is connected with refrigerant outlet pipeline, and the first medium outlet of plate heat exchanger is connected with refrigerant import pipeline;Between refrigerant import pipeline, refrigerant outlet pipeline is connected with compressor refrigeration system.The utility model energy-saving system increases liquefied natural gas cold energy cooling on the basis of original refrigeration system of air conditioner, to make air conditioner have liquefied natural gas cold energy cooling mode and independent air conditioner cooling mode.

Description

Technical Field

[0001] This utility model belongs to the field of liquefied natural gas cold energy utilization technology, specifically relating to an energy-saving system for the cascade utilization of liquefied natural gas gasification cold energy. Background Technology

[0002] Liquefied natural gas (LNG), as a clean energy source, utilizes cryogenic cold energy technology, a significant application technology for energy conservation and environmental protection. Cryogenic cold energy refers to the cooling energy released during the vaporization of LNG into natural gas. Currently, this cryogenic cold energy is typically released directly into the environment, resulting in underutilization and substantial energy waste. Furthermore, in recent years, with the increase in building air conditioning loads, the energy consumption of air conditioning systems has become increasingly prominent. Traditional air conditioning systems rely on electrically driven compressors to provide cooling, leading to high operating energy consumption. If the cooling energy released during LNG vaporization could be directly used in air conditioning systems, energy consumption could be significantly reduced, electricity demand decreased, and energy savings achieved. However, currently, most LNG cold energy recovery systems are primarily used for power generation, and their application in air conditioning cooling has not been fully developed and utilized.

[0003] Based on this, this application combines the cold energy recovery during the liquefied natural gas gasification process with the building air conditioning system, and proposes an energy-saving system for the cascade utilization of cold energy from liquefied natural gas gasification. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an energy-saving system for the cascade utilization of cold energy from liquefied natural gas vaporization.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A cascaded energy-saving system for the utilization of cold energy from liquefied natural gas vaporization includes a liquefied natural gas storage tank, a vaporization heat exchanger, a cold water storage tank, and a plate heat exchanger. The outlet of the liquefied natural gas storage tank is connected to the inlet of the liquefied natural gas transfer pump, the outlet of the liquefied natural gas transfer pump is connected to the first medium inlet of the gasification heat exchanger, and the first medium outlet of the gasification heat exchanger is connected to the gas pipeline. The inlet and outlet of the second medium in the gasification heat exchanger are connected to the cold water storage tank. The inlet and outlet of the second medium in the plate heat exchanger are connected to the energy storage tank, the inlet of the first medium in the plate heat exchanger is connected to the refrigerant outlet pipe of the indoor air conditioner, and the outlet of the first medium in the plate heat exchanger is connected to the refrigerant inlet pipe of the indoor air conditioner. A compressor refrigeration system is connected between the refrigerant inlet pipe and the refrigerant outlet pipe.

[0006] Preferably, a first water pump is installed on the pipeline between the inlet of the second medium and the cold water storage tank in the gasification heat exchanger.

[0007] Preferably, a second water pump is installed on the pipeline between the second medium inlet and the cold water storage tank in the plate heat exchanger.

[0008] Preferably, a refrigerant pump is installed on the pipeline between the first medium outlet and the refrigerant inlet pipeline in the plate heat exchanger.

[0009] Preferably, a first control valve is installed on the pipeline between the first medium inlet and the refrigerant outlet pipeline in the plate heat exchanger; A second control valve is installed on the pipeline between the first medium outlet and the refrigerant inlet pipeline in the plate heat exchanger. The second control valve is located at the outlet end of the fluorine pump.

[0010] Preferably, the compressor refrigeration system includes a compressor, a condenser, and an expansion valve; The compressor inlet is connected to the refrigerant outlet pipe, the compressor outlet is connected to the condenser inlet, the condenser outlet is connected to the expansion valve inlet, and the expansion valve outlet is connected to the refrigerant inlet pipe.

[0011] Preferably, a third control valve is installed on the pipeline between the compressor inlet and the refrigerant outlet, and a fourth control valve is installed on the pipeline between the expansion valve outlet and the refrigerant inlet.

[0012] Preferably, the condenser is an air-cooled condenser.

[0013] Preferably, a power generation module is installed on the pipeline between the outlet of the liquefied natural gas transfer pump and the first medium inlet of the gasification heat exchanger; The power generation module includes a first heat exchanger, a medium pump, a second heat exchanger, and a turbine generator; The outlet of the liquefied natural gas transfer pump is connected to the first medium inlet of the first heat exchanger, and the first medium outlet of the first heat exchanger is connected to the first medium inlet of the gasification heat exchanger. The exhaust end of the turbine generator is connected to the second medium inlet of the first heat exchanger, the second medium outlet of the first heat exchanger is connected to the inlet of the medium pump, the outlet of the medium pump is connected to the first medium inlet of the second heat exchanger, and the first medium outlet of the second heat exchanger is connected to the exhaust end of the turbine generator; a heat source medium for heating is introduced into the second heat exchanger.

[0014] Preferably, an ice-making module is installed on the pipeline between the first medium outlet of the first heat exchanger and the first medium inlet of the gasification heat exchanger. The ice-making module includes an ice-making heat exchanger, an ice-making water pump, and an ice maker; The first medium outlet of the first heat exchanger is connected to the first medium inlet of the ice-making heat exchanger, and the first medium outlet of the ice-making heat exchanger is connected to the first medium inlet of the vaporization heat exchanger; the second medium inlet of the ice-making heat exchanger is connected to the ice-making water source, the second medium outlet of the ice-making heat exchanger is connected to the inlet of the ice-making water pump, and the outlet of the ice-making water pump is connected to the water inlet of the ice maker.

[0015] The beneficial effects of this utility model are: (1) The energy-saving system of this utility model adds liquefied natural gas (LNG) cold energy supply to the original refrigeration system of the air conditioner, so that the air conditioner has an LNG cold energy supply mode and an independent air conditioner cooling mode. When the LNG supply is sufficient, the LNG cold energy supply mode is switched on. The refrigerant in the indoor air conditioner enters the plate heat exchanger and exchanges heat with the cold water entering from the cold water storage tank, so that the refrigerant cools down and condenses. The condensed refrigerant is directly transported to the indoor air conditioner for cooling by the refrigerant pump, thereby providing a stable cold source for the air conditioning system and reducing the power consumption of the air conditioner. When the LNG supply is insufficient, the air conditioning system's own compressor drives the refrigeration cycle. Through mode switching, the energy consumption of the air conditioning system is reduced while ensuring the air conditioning cooling, and the utilization efficiency of LNG cold energy is improved.

[0016] (2) The energy-saving system of this utility model uses a cold water storage tank as a cold energy regulation unit, so that the cold water side has a certain cold energy reserve capacity to cope with the fluctuation of liquefied natural gas supply or short-term load changes and improve the stability of cooling supply.

[0017] (3) Multiple closed-loop systems within the energy-saving system of this utility model ensure efficient transfer and utilization of cold energy: a closed-loop cold water circulation is formed on the circulating water side between the cold water storage tank and the plate heat exchanger, with the cold water storage tank serving as a cold capacity regulation unit to continuously provide a stable cold source for the plate heat exchanger; a closed-loop refrigerant circulation is formed on the refrigerant side between the plate heat exchanger and the indoor air conditioner, with liquid refrigerant being transported to the indoor air conditioner via a refrigerant pump, and then returning to the plate heat exchanger for condensation after completing the cooling process, ensuring the system's continuous cooling capacity. Through the coordinated operation of the overall system circulation, the energy-saving system of this application can efficiently utilize the cold energy of liquefied natural gas, improve the energy efficiency of the air conditioning system, reduce the power consumption caused by traditional refrigeration methods, and further enhance the overall energy-saving effect.

[0018] (4) This utility model can adopt a modular design. By setting up a power generation module and an ice-making module, the liquefied natural gas first enters the power generation module before entering the gasification heat exchanger. The liquefied natural gas cold energy is used to generate electricity and recover high-grade cold energy. Then it enters the ice-making module to make ice using the liquefied natural gas cold energy and recover medium-grade cold energy. Finally, it enters the gasification heat exchanger to use the liquefied natural gas cold energy for air conditioning and refrigeration and recover low-grade cold energy, thus realizing the multi-level cascade utilization of cold energy. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0020] Figure 1 This is a connection diagram of the liquefied natural gas gasification cold energy cascade utilization energy-saving system in Embodiment 1 of this utility model; Figure 2 This is a connection diagram of the liquefied natural gas vaporization cold energy cascade utilization energy-saving system in Embodiment 2 of this utility model; Figure 3 This is a connection diagram of the liquefied natural gas vaporization cold energy cascade utilization energy-saving system in Embodiment 3 of this utility model; in: 1. Liquefied natural gas storage tank; 2. Gasification heat exchanger; 3. Cold storage water tank; 31. First water pump; 32. Second water pump; 4. Plate heat exchanger; 41. First control valve; 42. Second control valve; 5. Liquefied natural gas transfer pump; 6. Gas pipeline; 7. Refrigerant pump; 8. Compressor; 81. Condenser; 82. Expansion valve; 83. Third control valve; 84. Fourth control valve; 9. Indoor air conditioner; 91. Refrigerant outlet pipeline; 92. Refrigerant inlet pipeline; 10. Power generation module; 101. First heat exchanger; 102. Medium pump; 103. Second heat exchanger; 104. Turbine generator; 11. Ice making module; 111. Ice making heat exchanger; 112. Ice making water pump; 113. Ice maker. Detailed Implementation

[0021] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, 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 application pertains.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] In this utility model, terms such as "upper", "lower", "bottom", and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various components or elements of this utility model and do not specifically refer to any component or element in this utility model. They should not be construed as limiting this utility model.

[0024] In this utility model, terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Example 1: like Figure 1 As shown, an energy-saving system for the cascade utilization of cold energy from liquefied natural gas vaporization includes a liquefied natural gas storage tank 1, a vaporization heat exchanger 2, a cold water storage tank 3, and a plate heat exchanger 4. The outlet of the liquefied natural gas storage tank 1 is connected to the inlet of the liquefied natural gas transfer pump 5, the outlet of the liquefied natural gas transfer pump 5 is connected to the first medium inlet of the gasification heat exchanger 2, and the first medium outlet of the gasification heat exchanger 2 is connected to the gas pipeline 6. The inlet and outlet of the second medium in the gasification heat exchanger 2 are connected to the cold water storage tank 3. The inlet and outlet of the second medium in the plate heat exchanger 4 are connected to the energy storage tank 3. The inlet of the first medium in the plate heat exchanger 4 is connected to the refrigerant outlet pipe 91 of the indoor air conditioner 9. The outlet of the first medium in the plate heat exchanger 4 is connected to the refrigerant inlet pipe 92 of the indoor air conditioner 9. A compressor refrigeration system is connected between the refrigerant inlet pipe 92 and the refrigerant outlet pipe 91.

[0027] Preferably, a first water pump 31 is installed on the pipeline between the inlet of the second medium in the gasification heat exchanger 2 and the cold water storage tank 3.

[0028] Preferably, a second water pump 32 is installed on the pipeline between the second medium inlet and the cold water storage tank 3 in the plate heat exchanger 4.

[0029] Preferably, a refrigerant pump 7 is installed on the pipeline between the first medium outlet and the refrigerant inlet pipeline 92 in the plate heat exchanger 4.

[0030] Preferably, a first control valve 41 is installed on the pipeline between the first medium inlet and the refrigerant outlet pipeline 91 in the plate heat exchanger 4; A second control valve 42 is installed on the pipeline between the first medium outlet and the refrigerant inlet pipeline 92 in the plate heat exchanger 4; The second control valve 42 is located at the outlet end of the fluorine pump 7.

[0031] Preferably, the compressor refrigeration system includes a compressor 8, a condenser 81, and an expansion valve 82; The inlet of the compressor 8 is connected to the refrigerant outlet pipe 91, the outlet of the compressor 8 is connected to the inlet of the condenser 81, the outlet of the condenser 81 is connected to the inlet of the expansion valve 82, and the outlet of the expansion valve 82 is connected to the refrigerant inlet pipe 92.

[0032] Preferably, a third control valve 83 is provided on the pipeline between the compressor 8 inlet and the refrigerant outlet pipeline 91, and a fourth control valve 84 is provided on the pipeline between the expansion valve 82 outlet and the refrigerant inlet pipeline 92.

[0033] Preferably, the condenser 81 is an air-cooled condenser.

[0034] In Example 1, liquefied natural gas (LNG) first enters the vaporization heat exchanger 2 under the action of LNG transfer pump 5. Water in the cold storage tank 3 enters the vaporization heat exchanger 2 via the first water pump 31. The LNG vaporizes and releases cooling energy in the vaporization heat exchanger 2, cooling the water, which is then returned to the cold storage tank 3 for cold energy storage. The cold storage tank 3 serves as the system's cold energy storage unit to cope with fluctuations in the LNG supply. The fully vaporized natural gas, having released its cooling energy, is then transported to the gas pipeline 6 to ensure normal gas supply to the LNG vaporization station.

[0035] After the cold storage tank 3 stores the cold energy, the water in it is transported to the plate heat exchanger 4 by the second water pump 32. In the plate heat exchanger 4, the water exchanges heat with the refrigerant output by the indoor air conditioner 9, causing the refrigerant to condense from a gaseous state to a liquid state.

[0036] In Example 1, the operation mode of the energy-saving system is dynamically adjusted according to the liquefied natural gas supply and air conditioning load demand, and the switching between liquefied natural gas cooling mode and independent air conditioning cooling mode is realized through valves.

[0037] In the liquefied natural gas (LNG) cold energy cooling mode, the first control valve 41 and the second control valve 42 are opened, and the third control valve 83 and the fourth control valve 84 are closed. The refrigerant in the refrigerant outlet pipe 91 of the indoor air conditioner 9 enters the plate heat exchanger 4 through the first control valve 41 to exchange heat with the cold water and achieve condensation. The condensed refrigerant is directly transported to the refrigerant inlet pipe 92 through the refrigerant pump 7 and the second control valve 42, and enters the indoor air conditioner 9 to evaporate and absorb heat, thereby achieving cooling.

[0038] In independent air conditioning cooling mode, the first control valve 41 and the second control valve 42 are closed, and the third control valve 83 and the fourth control valve 84 are opened. The refrigerant is pressurized by the compressor 8 in the air conditioning system of the indoor air conditioner 9, and after heat exchange and condensation by the condenser 81, it is throttled and depressurized by the expansion valve 82, and then enters the indoor air conditioner 9 through the refrigerant inlet pipe 92 to evaporate and absorb heat, completing the refrigeration cycle. This ensures that the air conditioning system can still operate normally when liquefied natural gas cooling energy is unavailable.

[0039] In this application, multiple closed-loop cycles within the energy-saving system ensure the efficient transfer and utilization of cold energy: a closed-loop cold water cycle is formed on the circulating water side between the cold water storage tank 3 and the plate heat exchanger 4, with the cold water storage tank 3 acting as a cooling capacity regulation unit to continuously provide a stable cold source for the plate heat exchanger 4; a closed-loop refrigerant cycle is formed on the refrigerant side between the plate heat exchanger 4 and the indoor air conditioner 9, with liquid refrigerant being transported to the indoor air conditioner 9 via the refrigerant pump 7, and then returning to the plate heat exchanger 4 for condensation after completing the cooling process, ensuring the system's continuous cooling capacity. Through the coordinated operation of the overall system cycle, the energy-saving system of this application can efficiently utilize liquefied natural gas cold energy, improve the energy efficiency of the air conditioning system, reduce the power consumption caused by traditional refrigeration methods, and further enhance the overall energy-saving effect.

[0040] The energy-saving system in Example 1 adds liquefied natural gas (LNG) cooling energy to the original refrigeration system of the air conditioner, thus enabling the air conditioner to have both LNG cooling energy supply mode and independent air conditioning cooling mode, which can reduce the energy consumption of the air conditioning system and improve the utilization efficiency of LNG cooling energy.

[0041] Example 2: Based on Example 1, such as Figure 2 As shown, a power generation module 10 is installed on the pipeline between the outlet of the liquefied natural gas transfer pump 5 and the first medium inlet of the gasification heat exchanger 2; The power generation module 10 includes a first heat exchanger 101, a medium pump 102, a second heat exchanger 103, and a turbine generator 104; The outlet of the liquefied natural gas transfer pump 5 is connected to the first medium inlet of the first heat exchanger 101, and the first medium outlet of the first heat exchanger 101 is connected to the first medium inlet of the gasification heat exchanger 2. The exhaust end of the turbine generator 104 is connected to the second medium inlet of the first heat exchanger 101, the second medium outlet of the first heat exchanger 101 is connected to the inlet of the medium pump 102, the outlet of the medium pump 102 is connected to the first medium inlet of the second heat exchanger 103, and the first medium outlet of the second heat exchanger 103 is connected to the exhaust end of the turbine generator 104; a heat source medium for heating is introduced into the second heat exchanger 103.

[0042] The heat source medium introduced into the second heat exchanger 103 for heating is seawater or air, and the working medium in the turbine generator 104 is propane.

[0043] In Example 2, before entering the gasification heat exchanger 2, the liquefied natural gas (LNG) first enters the power generation module 10 to generate electricity using its cold energy. Specifically, propane vapor at the outlet of the turbine generator 104 exchanges heat with LNG in the first heat exchanger 101, transforming into liquid propane. After being pressurized by the medium pump 102, the liquid propane enters the second heat exchanger 103 to exchange heat with seawater or air, forming pressurized propane vapor. Subsequently, the pressurized propane vapor enters the turbine generator 104 through its inlet to generate electricity. The LNG, after exchanging heat with the propane vapor, continues to be transported into the gasification heat exchanger 2 for cooling in air conditioning.

[0044] Example 3: Based on Example 2, such as Figure 3 As shown, an ice-making module 11 is installed on the pipeline between the first medium outlet of the first heat exchanger 101 and the first medium inlet of the gasification heat exchanger 2. The ice-making module 11 includes an ice-making heat exchanger 111, an ice-making water pump 112, and an ice maker 113; The first medium outlet of the first heat exchanger 101 is connected to the first medium inlet of the ice-making heat exchanger 111, and the first medium outlet of the ice-making heat exchanger 111 is connected to the first medium inlet of the vaporization heat exchanger 2; the second medium inlet of the ice-making heat exchanger 111 is connected to the ice-making water source, the second medium outlet of the ice-making heat exchanger 111 is connected to the inlet of the ice-making water pump 112, and the outlet of the ice-making water pump 112 is connected to the water inlet of the ice maker 113.

[0045] In Example 3, before entering the gasification heat exchanger 2, the liquefied natural gas first enters the power generation module 10, where the cold energy of the liquefied natural gas is used to generate electricity and recover high-grade cold energy. Then it enters the ice-making module 11, where the cold energy of the liquefied natural gas is used to make ice and recover medium-grade cold energy. Finally, it enters the gasification heat exchanger 2, where the cold energy of the liquefied natural gas is used for air conditioning and refrigeration to recover low-grade cold energy, thus realizing the multi-stage cascade utilization of cold energy.

[0046] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, they are not intended to limit the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the protection scope of the present utility model.

Claims

1. A cascaded energy-saving system for the cold energy utilization of liquefied natural gas vaporization, characterized in that, This includes liquefied natural gas storage tanks, gasification heat exchangers, cold water storage tanks, and plate heat exchangers. The outlet of the liquefied natural gas storage tank is connected to the inlet of the liquefied natural gas transfer pump, the outlet of the liquefied natural gas transfer pump is connected to the first medium inlet of the gasification heat exchanger, and the first medium outlet of the gasification heat exchanger is connected to the gas pipeline. The inlet and outlet of the second medium in the gasification heat exchanger are connected to the cold water storage tank. The inlet and outlet of the second medium in the plate heat exchanger are connected to the energy storage tank, the inlet of the first medium in the plate heat exchanger is connected to the refrigerant outlet pipe of the indoor air conditioner, and the outlet of the first medium in the plate heat exchanger is connected to the refrigerant inlet pipe of the indoor air conditioner. A compressor refrigeration system is connected between the refrigerant inlet pipe and the refrigerant outlet pipe.

2. The liquefied natural gas vaporization cold energy cascade utilization energy-saving system as described in claim 1, characterized in that, A first water pump is installed on the pipeline between the inlet of the second medium and the cold water storage tank in the gasification heat exchanger.

3. The liquefied natural gas vaporization cold energy cascade utilization energy-saving system as described in claim 1, characterized in that, A second water pump is installed on the pipeline between the second medium inlet and the cold water storage tank in the plate heat exchanger.

4. The liquefied natural gas vaporization cold energy cascade utilization energy-saving system as described in claim 1, characterized in that, A refrigerant pump is installed on the pipeline between the first medium outlet and the refrigerant inlet pipeline in the plate heat exchanger.

5. The liquefied natural gas vaporization cold energy cascade utilization energy-saving system as described in claim 4, characterized in that, A first control valve is installed on the pipeline between the first medium inlet and the refrigerant outlet pipeline in the plate heat exchanger. A second control valve is installed on the pipeline between the first medium outlet and the refrigerant inlet pipeline in the plate heat exchanger. The second control valve is located at the outlet end of the fluorine pump.

6. The liquefied natural gas vaporization cold energy cascade utilization energy-saving system as described in claim 1, characterized in that, The compressor refrigeration system includes a compressor, a condenser, and an expansion valve; The compressor inlet is connected to the refrigerant outlet pipe, the compressor outlet is connected to the condenser inlet, the condenser outlet is connected to the expansion valve inlet, and the expansion valve outlet is connected to the refrigerant inlet pipe.

7. The liquefied natural gas vaporization cold energy cascade utilization energy-saving system as described in claim 6, characterized in that, A third control valve is installed on the pipeline between the compressor inlet and the refrigerant outlet, and a fourth control valve is installed on the pipeline between the expansion valve outlet and the refrigerant inlet.

8. The liquefied natural gas vaporization cold energy cascade utilization energy-saving system as described in claim 6, characterized in that, The condenser is an air-cooled condenser.

9. The liquefied natural gas vaporization cold energy cascade utilization energy-saving system as described in claim 1, characterized in that, A power generation module is installed on the pipeline between the outlet of the liquefied natural gas delivery pump and the first medium inlet of the gasification heat exchanger. The power generation module includes a first heat exchanger, a medium pump, a second heat exchanger, and a turbine generator; The outlet of the liquefied natural gas delivery pump is connected to the first medium inlet of the first heat exchanger, and the first medium outlet of the first heat exchanger is connected to the first medium inlet of the gasification heat exchanger. The exhaust end of the turbine generator is connected to the second medium inlet of the first heat exchanger, the second medium outlet of the first heat exchanger is connected to the inlet of the medium pump, the outlet of the medium pump is connected to the first medium inlet of the second heat exchanger, and the first medium outlet of the second heat exchanger is connected to the exhaust end of the turbine generator; a heat source medium for heating is introduced into the second heat exchanger.

10. The liquefied natural gas vaporization cold energy cascade utilization energy-saving system as described in claim 9, characterized in that, An ice-making module is installed on the pipeline between the first medium outlet of the first heat exchanger and the first medium inlet of the gasification heat exchanger. The ice-making module includes an ice-making heat exchanger, an ice-making water pump, and an ice maker; The first medium outlet of the first heat exchanger is connected to the first medium inlet of the ice-making heat exchanger, and the first medium outlet of the ice-making heat exchanger is connected to the first medium inlet of the vaporization heat exchanger; the second medium inlet of the ice-making heat exchanger is connected to the ice-making water source, the second medium outlet of the ice-making heat exchanger is connected to the inlet of the ice-making water pump, and the outlet of the ice-making water pump is connected to the water inlet of the ice maker.

Images