Liquefied natural gas gasification system

Abstract

The utility model discloses a liquefied natural gas gasification system, and relates to the technical field of natural gas, the liquefied natural gas gasification system comprises a primary heat exchange module and a secondary heat exchange module, the primary heat exchange module comprises an ice making assembly, and latent heat released in the ice making process of the primary heat exchange module can preliminarily heat and gasify liquefied natural gas output by a liquefied natural gas storage tank; the second-stage heat exchange module comprises a heat pump assembly, and the liquefied natural gas heated by the first-stage heat exchange module can be subjected to heat exchange, heated and completely gasified. According to the liquefied natural gas gasification system provided by the utility model, the liquefied natural gas is preliminarily heated by latent heat released during ice making, and then is secondarily heated and gasified by the heat pump assembly, so that the gasification efficiency of the liquefied natural gas is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas, in particular to a liquefied natural gas gasification system. Background Technique

[0002] At present, some gasification schemes for liquefied natural gas use an ORV (open rack vaporizer) to vaporize liquefied natural gas into normal temperature natural gas by utilizing the temperature difference between the inlet and outlet of seawater, and directly discharge the gasification cold energy into the seawater. In winter, due to the decrease in seawater temperature and the reduction of the temperature difference between the inlet and outlet of seawater, the gasification efficiency of the original system decreases. Usually, the water bath method is adopted, which consumes gas energy at the cost of maintaining the normal operation of the gasification system. The gasification efficiency is low and the energy consumption is large. Content of the Utility Model

[0003] The purpose of the utility model is to provide a liquefied natural gas gasification system to solve the problems existing in the above-mentioned prior art. The latent heat released during ice making is used to initially heat the liquefied natural gas, and then it is secondarily heated and vaporized by a heat pump assembly, which improves the gasification efficiency of the liquefied natural gas and reduces the energy consumption.

[0004] To achieve the above purpose, the utility model provides the following scheme:

[0005] The utility model provides a liquefied natural gas gasification system, including:

[0006] A primary heat exchange module, including an ice making assembly, the latent heat released during its ice making process can initially heat and vaporize the liquefied natural gas output from the liquefied natural gas storage tank;

[0007] A secondary heat exchange module, including a heat pump assembly, which can heat up and completely vaporize the liquefied natural gas heated by the primary heat exchange module.

[0008] Optionally, the liquefied natural gas storage tank is connected to the ice making assembly through a gas transmission pipeline; a liquefied natural gas delivery pump is provided on the gas transmission pipeline, which can transmit the liquefied natural gas in the liquefied natural gas storage tank to the ice making assembly as a refrigerant to realize ice making and absorb the latent heat released during the ice making process.

[0009] Optionally, the primary heat exchange module further includes a plate and shell heat exchanger, the plate and shell heat exchanger is connected to the ice making assembly through a circulation pipeline, a liquid storage tank is connected to the circulation pipeline, propane is provided in the liquid storage tank, the propane can be transmitted to the ice making assembly as a refrigerant to realize ice making and absorb the latent heat released during the ice making process; the liquefied natural gas storage tank is connected to the plate and shell heat exchanger through a gas transmission pipeline; a liquefied natural gas delivery pump is provided on the gas transmission pipeline, which can transmit the liquefied natural gas in the liquefied natural gas storage tank to the plate and shell heat exchanger to exchange heat with the propane after absorbing heat.

[0010] Optionally, the primary heat exchange module further includes a skid-mounted heat exchange device, which includes a first plate heat exchanger and a second plate heat exchanger disposed within a metal structure frame. The first plate heat exchanger and the second plate heat exchanger are connected through a first circulation pipeline, and a first liquid storage tank is connected to the first circulation pipeline. Propane is provided in the first liquid storage tank, and the propane can circulate between the first plate heat exchanger and the second plate heat exchanger; the second plate heat exchanger is connected to the ice-making assembly through a second circulation pipeline, and a second liquid storage tank is connected to the second circulation pipeline. Refrigerant is provided in the second liquid storage tank, and the refrigerant can be transmitted into the ice-making assembly to realize ice-making and absorb the latent heat released during the ice-making process; the liquefied natural gas storage tank is connected to the first plate heat exchanger through a gas transmission pipeline; a liquefied natural gas transfer pump is provided on the gas transmission pipeline, which can transmit the liquefied natural gas in the liquefied natural gas storage tank into the first plate heat exchanger to exchange heat with the propane after heat absorption.

[0011] Optionally, the ice-making assembly includes an ice slurry machine and an ice storage tank, and a stirrer is provided in the ice storage tank; the latent heat released during the ice-making process of the ice slurry machine can initially heat and vaporize the liquefied natural gas output from the liquefied natural gas storage tank; the ice slurry machine is connected to the ice storage tank and can convey the made ice into the ice storage tank. The inlet of the ice slurry machine is connected to a water intake pump through a first three-way valve. The water intake pump is externally connected to a water source inlet through a pipeline, and the third valve port of the first three-way valve is connected to the inside of the ice storage tank. The outlet of the ice storage tank is connected to an ice slurry outlet through an ice conveying pump.

[0012] Optionally, the ice slurry machine is a rotary scraping ice-making machine or a subcooled water ice-making machine.

[0013] Optionally, the secondary heat exchange module includes a heat exchanger and a heat pump unit. The heat pump unit is connected to the heat exchanger through a circulating heat exchange medium path, and a circulation pump is provided on the circulating heat exchange medium path, which can reciprocally circulate the heat exchange medium between the heat exchanger and the heat pump unit; the gas transmission pipeline passes through the heat exchanger after heat exchange with the ice-making assembly and exchanges heat and temperature rise with the heat exchange medium in the heat exchanger.

[0014] Optionally, a heat source tower is externally connected to the evaporator side of the heat pump unit. An air inlet and an air outlet are respectively provided at both ends of the heat source tower; a circulation pump is provided on the heat source circulation pipeline connecting the heat pump unit and the heat source tower, and an antifreeze working medium is introduced into the heat source circulation pipeline. The antifreeze working medium is a calcium chloride solution or an ethylene glycol solution.

[0015] Optionally, the evaporator side of the heat pump unit is connected to a water return port through a water return pipeline, and the evaporator side of the heat pump unit is connected to a water intake port through a water intake pipeline. An automatic sewage filter and a cyclone desander are provided on the water intake pipeline.

[0016] Optionally, the secondary heat exchange module further includes a hot water storage tank. The hot water storage tank is communicated with the hot end pipeline of the circulating heat exchange medium path near one end of the heat pump unit through a second three-way valve, and the hot water storage tank is communicated with the cold end pipeline of the circulating heat exchange medium path near one end of the heat pump unit through a third three-way valve; the hot water storage tank is communicated with the hot end pipeline of the circulating heat exchange medium path near one end of the heat exchanger through a fourth three-way valve, and a circulation pump is provided on this hot end pipeline. The hot water storage tank is communicated with the cold end pipeline of the circulating heat exchange medium path near one end of the heat exchanger through a fifth three-way valve.

[0017] The present utility model has achieved the following technical effects compared with the prior art:

[0018] The present utility model adopts two-stage heat exchange. The first-stage heat exchange utilizes the latent heat released during ice making to vaporize liquefied natural gas at -162 °C into low-temperature natural gas at -40 °C to -20 °C. The second-stage heat exchange uses a heat pump assembly for reheating to make the outlet temperature of the natural gas reach above 5 °C, solving the problems of low vaporization efficiency of liquefied natural gas and large consumption of traditional energy caused by cold weather in winter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic diagram of the first structure of the liquefied natural gas vaporization system according to Embodiment 1 of the present utility model;

[0021] Figure 2 It is a schematic diagram of the second structure of the liquefied natural gas vaporization system according to Embodiment 1 of the present utility model;

[0022] Figure 3 It is a schematic diagram of the primary heat exchange module according to Embodiment 2 of the present utility model;

[0023] Figure 4 It is a schematic diagram of the primary heat exchange module according to Embodiment 3 of the present utility model;

[0024] Figure 5 It is a schematic diagram of the first structure of the secondary heat exchange module of the present utility model;

[0025] Figure 6 This is the second structural schematic diagram of the secondary heat exchange module of the present utility model.

[0026] In the figure: 1 - liquefied natural gas storage tank, 2 - liquefied natural gas transfer pump, 3 - ice slurry machine, 4 - ice storage tank, 5 - stirrer, 6 - first three-way valve, 7 - water intake pump, 8 - ice transfer pump, 9 - metal structure frame, 10 - first plate heat exchanger, 11 - second plate heat exchanger, 12 - first liquid storage tank, 13 - second liquid storage tank, 14 - first circulation pump, 15 - first valve, 16 - second valve, 17 - third valve, 18 - fourth valve, 19 - heat exchanger, 20 - second circulation pump, 21 - heat pump unit, 22 - third circulation pump, 23 - heat source tower, 231 - air inlet, 232 - air outlet, 24 - automatic sewage filter, 25 - cyclone desander, 26 - hot water storage tank, 27 - fourth circulation pump, 28 - second three-way valve, 29 - third three-way valve, 30 - fourth three-way valve, 31 - fifth three-way valve. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0028] The purpose of the present utility model is to provide a liquefied natural gas gasification system to solve the problems existing in the above-mentioned prior art. The latent heat released during ice making is used to preliminarily heat the liquefied natural gas, and then it is secondarily heated and gasified by the heat pump assembly, which improves the gasification efficiency of the liquefied natural gas and reduces the energy consumption.

[0029] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Embodiment 1

[0031] Refer to Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, this embodiment provides a liquefied natural gas gasification system, including a primary heat exchange module and a secondary heat exchange module. The primary heat exchange module of this embodiment includes a skid-mounted heat exchange device and an ice making component; the secondary heat exchange module includes a heat pump component, as Figure 1 and Figure 2As shown, in this embodiment, the liquefied natural gas storage tank 1 is connected to the ice-making assembly through a gas pipeline; a liquefied natural gas transfer pump 2 is provided on the gas pipeline, which can transfer the liquefied natural gas in the liquefied natural gas storage tank 1 to the ice-making assembly as a refrigerant to realize ice-making and absorb the latent heat released during the ice-making process.

[0032] The ice-making assembly of this embodiment includes an ice slurry machine 3 and an ice storage tank 4. A stirrer 5 is provided in the ice storage tank 4. The stirrer 5 can ensure the uniformity of the ice slurry and prevent ice crystal aggregation; the latent heat released during the ice-making process of the ice slurry machine 3 can initially heat and vaporize the liquefied natural gas output from the liquefied natural gas storage tank 1; the ice slurry machine 3 is connected to the ice storage tank 4 and can transport the made ice to the ice storage tank 4. The inlet of the ice slurry machine 3 is connected to a water intake pump 7 through a first three-way valve 6. The water intake pump 7 is externally connected to a water source inlet through a pipeline. The third valve port of the first three-way valve 6 is connected to the inside of the ice storage tank 4. The outlet of the ice storage tank 4 is connected to an ice slurry outlet through an ice slurry pump 8.

[0033] The ice slurry machine 3 can adopt a rotary scraping ice-making machine (flake ice machine) or a supercooled water ice-making machine with known structures and principles. The water source required for ice-making can come from river water, lake water or seawater. If the ice slurry machine 3 adopts the form of flake ice, the water source flows through the inner wall of its concentric circular sleeve under the action of the water intake pump 7 and is cooled by the refrigerant in the interlayer to form ice crystals. The rotating shaft drives the scraper to scrape off the ice crystals formed on the wall surface and fall into the ice storage tank 4, where they are mixed with the water source from the other end of the first three-way valve 6 to form ice slurry.

[0034] If the ice slurry machine 3 adopts the form of supercooled water, the water source is cooled to a supercooled state in the internal subcooler of the ice slurry machine 3. After passing through the subcooling eliminator, it is transported out of the ice-making machine in the form of ice slurry and enters the ice storage tank 4. By adjusting the opening degree of the first three-way valve 6, the water flow rate entering the ice storage tank 4 can be controlled, thereby controlling the ice content rate of the ice slurry. The stirrer 5 can ensure the uniformity of the ice slurry and prevent ice crystal aggregation. Finally, under the action of the ice slurry pump 8, the ice slurry is directly discharged into the original river water, lake water, seawater or stored in a water tank.

[0035] As Figure 5 As shown, the first structure of the secondary heat exchange module of this embodiment includes a heat exchanger 19 and a heat pump unit 21. The heat pump unit 21 is connected to the heat exchanger 19 through a circulating heat exchange medium path. A circulating pump is provided on the circulating heat exchange medium path, which can reciprocally circulate the heat exchange medium between the heat exchanger 19 and the heat pump unit 21; the gas pipeline passes through the heat exchanger 19 after heat exchange with the ice-making assembly and exchanges heat with the heat exchange medium in the heat exchanger 19 to increase the temperature. The evaporator side of the heat pump unit 21 in this structure is externally connected to a heat source tower 23. Both ends of the heat source tower 23 are respectively provided with an air inlet 231 and an air outlet 232; a third circulating pump 22 is provided on the heat source circulation pipeline connecting the heat pump unit 21 and the heat source tower 23. An antifreeze working fluid is introduced into the heat source circulation pipeline, and the antifreeze working fluid is calcium chloride solution or ethylene glycol solution.

[0036] As Figure 6 shown, the second structure of the secondary heat exchange module in this embodiment includes a heat exchanger 19 and a heat pump unit 21. The heat pump unit 21 is connected to the heat exchanger 19 through a circulating heat exchange medium passage. A circulating pump is provided on the circulating heat exchange medium passage, which can reciprocally circulate the heat exchange medium between the heat exchanger 19 and the heat pump unit 21; the gas transmission pipeline passes through the heat exchanger 19 after heat exchange with the ice-making assembly, and exchanges heat and raises the temperature with the heat exchange medium in the heat exchanger 19; the evaporator side of the heat pump unit 21 is connected to a water return port through a water return pipeline, and the evaporator side of the heat pump unit 21 is connected to a water intake port through a water intake pipeline. An automatic sewage filter 24 and a swirl desander 25 are provided on the water intake pipeline. According to the energy conditions around the gasification station, the heat pump unit 21 can also adopt an air source heat pump, a solar heat pump, etc., or utilize industrial waste heat and other auxiliary heating equipment.

[0037] In a preferred embodiment, as Figure 5 and Figure 6 shown, in order to improve energy utilization efficiency and avoid energy waste, a heat storage hot pool is designed in this embodiment. The hot water storage pool 26 is connected to the hot end pipeline of the circulating heat exchange medium passage near the heat pump unit 21 through a second three-way valve 28, and the hot water storage pool 26 is connected to the cold end pipeline of the circulating heat exchange medium passage near the heat pump unit 21 through a third three-way valve 29. A second circulating pump 20 is provided on the cold end pipeline; the hot water storage pool 26 is connected to the hot end pipeline of the circulating heat exchange medium passage near the heat exchanger 19 through a fourth three-way valve 30, and a fourth circulating pump 27 is provided on the hot end pipeline. The hot water storage pool 26 is connected to the cold end pipeline of the circulating heat exchange medium passage near the heat exchanger 19 through a fifth three-way valve 31; thus, the excess heat energy of the secondary heat exchange module can be stored through the hot water storage pool 26 and other means to cope with the peak shaving use of liquefied natural gas gasification.

[0038] When this embodiment operates, liquefied natural gas at -162°C comes out from the liquefied natural gas storage tank 1. First, it acts as a refrigerant and exchanges heat with the ice slurry machine 3 at the first stage. After the first-stage heat exchange, the liquefied natural gas at -162°C is gasified into low-temperature natural gas at -40°C to -20°C. Subsequently, it undergoes secondary reheating. Heat can be obtained by using a heat source tower heat pump or a water source heat pump to produce hot water, etc., and reheating is carried out through the heat exchanger 19. After secondary reheating, the outlet temperature of the natural gas reaches above 5°C and is finally transported to natural gas users.

[0039] Embodiment Two

[0040] As Figure 3As shown, in this embodiment, the structure of the primary heat exchange module is further improved. The secondary heat exchange module in this embodiment can also adopt the first structure or the second structure respectively. To avoid the problem of unstable temperature change caused by directly using liquefied natural gas as a refrigerant to exchange heat with the ice slurry machine 3, a plate-shell heat exchanger is introduced in this embodiment. The plate-shell heat exchanger is connected to the ice-making component through a circulation pipeline, and a liquid storage tank is connected to the circulation pipeline. Propane is provided in the liquid storage tank, and propane can be used as a refrigerant to be transported into the ice-making component to realize ice-making and absorb the latent heat released during the ice-making process. The liquefied natural gas storage tank 1 is connected to the plate-shell heat exchanger through a gas pipeline. A liquefied natural gas transfer pump 2 is provided on the gas pipeline, which can transfer the liquefied natural gas in the liquefied natural gas storage tank 1 into the plate-shell heat exchanger to exchange heat with the propane after absorbing heat.

[0041] When this embodiment works, the liquefied natural gas at -162°C comes out of the liquefied natural gas storage tank 1, passes through the plate-shell heat exchanger, and the intermediate medium propane is introduced into the ice slurry machine 3 as a refrigerant to exchange heat with its water source side. After passing through the plate-shell heat exchanger, the liquefied natural gas at -162°C is vaporized into low-temperature natural gas at -40°C to -20°C. The low-temperature natural gas needs to pass through a reheating device and can be transported to users only after the temperature reaches above 5°C. The intermediate medium propane is vaporized through the ice slurry machine 3, liquefied again through the plate-shell heat exchanger, and undergoes a reciprocating gas-liquid phase change process. The plate-shell heat exchanger and the ice slurry machine 3 are arranged vertically with a certain height difference. The height of the plate-shell heat exchanger is greater than that of the ice slurry machine 3. Using the gravity heat pipe method, the propane circulation heat exchange process does not require external power.

[0042] Embodiment III

[0043] As Figure 4As shown, in this embodiment, the structure of the primary heat exchange module is further improved. The secondary heat exchange module of this embodiment can be selected as the first structure or the second structure according to needs; the skid-mounted heat exchange device of this embodiment includes a metal structure frame 9, a first plate-shell heat exchanger 10, and a second plate-shell heat exchanger 11. Equipment such as the first plate-shell heat exchanger 10 and the second plate-shell heat exchanger 11 are fixed on the metal structure frame 9, and pipelines, valves, pumps, containers, etc. are integrally assembled and installed in the metal structure frame 9. The purpose of the skid-mounted heat exchange device is to reasonably arrange the heat exchange equipment, pipelines, pumps, etc. in the skid-mounted heat exchange device according to the heat exchange process flow and spatial orientation, so as to make it a functional and modular integrated device, improve the engineering quality, and shorten the project duration; the first plate-shell heat exchanger 10 and the second plate-shell heat exchanger 11 are connected through a first circulation pipeline, and a first liquid storage tank 12 is connected to the first circulation pipeline. Propane is provided in the first liquid storage tank 12, and propane can circulate between the first plate-shell heat exchanger 10 and the second plate-shell heat exchanger 11. The first plate-shell heat exchanger 10 and the second plate-shell heat exchanger 11 are arranged at different heights, and the intermediate heat exchange medium is propane. The heat exchange process reciprocally undergoes gas-liquid phase changes, and under the action of the gravity heat pipe, the propane circulation does not require external power. Here, the heat exchange efficiency is mainly related to the height difference arrangement (gravity heat pipe effect) and its own performance of the first plate-shell heat exchanger 10 and the second plate-shell heat exchanger 11; and here the propane circulation relies on the action of the gravity heat pipe and does not require a circulation pump, reducing equipment investment and operating energy consumption; the second plate-shell heat exchanger 11 is connected to the ice-making assembly through a second circulation pipeline, and a first circulation pump 14 and a second liquid storage tank 13 are connected to the second circulation pipeline, and a third valve 17 and a fourth valve 18 are respectively provided on the cold end pipeline and the hot end pipeline of the second circulation pipeline; a refrigerant is provided in the second liquid storage tank 13, and the refrigerant can be transmitted into the ice-making assembly to realize ice-making and absorb the latent heat released during the ice-making process. The refrigerant introduced into the ice slurry machine 3 is a high-concentration ethylene glycol solution or other environmentally friendly refrigerants; the liquefied natural gas storage tank 1 is connected to the first plate-shell heat exchanger 10 through a gas transmission pipeline with a first valve 15; a liquefied natural gas transfer pump 2 is provided on the gas transmission pipeline, which can transmit the liquefied natural gas in the liquefied natural gas storage tank 1 into the first plate-shell heat exchanger 10 for heat exchange with the propane after heat absorption. A second valve 16 is provided on the gas transmission pipeline after heat exchange with the first plate-shell heat exchanger 10, and its end is used for transmission to the secondary heat exchange module for secondary reheating.

[0044] When this embodiment works, liquefied natural gas at -162°C comes out of the liquefied natural gas storage tank 1 and exchanges heat with the intermediate heat exchange medium through the first plate-shell heat exchanger 10. The intermediate heat exchange medium introduced into the circulation pipeline between the first plate-shell heat exchanger 10 and the second plate-shell heat exchanger 11 is propane. After the propane exchanges heat with the refrigerant and heats up in the second plate-shell heat exchanger 11, it circulates into the first plate-shell heat exchanger 10 to exchange heat with the liquefied natural gas and heat it up. In the circulation pipeline between the second plate-shell heat exchanger 11 and the ice slurry machine 3, a high-concentration ethylene glycol solution or other environmentally friendly refrigerant is introduced into the ice slurry machine 3 to absorb the latent heat released during the ice-making process. After passing through the first plate-shell heat exchanger 10, the liquefied natural gas at -162°C is gasified into low-temperature natural gas at -40°C to -20°C. The low-temperature natural gas needs to pass through a reheating device and can be transported to users only after the temperature reaches above 5°C.

[0045] In this utility model, specific examples are used to elaborate on the principle and implementation mode of the utility model. The description of the above embodiments is only used to help understand the method and its core idea of the utility model; at the same time, for those of ordinary skill in the art, according to the idea of the utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a limitation to the utility model.

Claims

1. A liquefied natural gas gasification system, characterized in that: include: The primary heat exchange module includes an ice-making component, and the latent heat released during the ice-making process can preliminarily heat and vaporize the liquefied natural gas output from the liquefied natural gas storage tank; The secondary heat exchange module includes a heat pump assembly, which can heat up the liquefied natural gas heated by the primary heat exchange module and completely gasify it.

2. The liquefied natural gas gasification system according to claim 1, characterized in that: The liquefied natural gas storage tank is connected to the ice-making assembly through a gas pipeline; a liquefied natural gas delivery pump is provided on the gas pipeline, which can transfer the liquefied natural gas in the liquefied natural gas storage tank as a refrigerant to the ice-making assembly to achieve ice making and absorb the latent heat released during the ice making process.

3. The liquefied natural gas gasification system according to claim 1, characterized in that: The primary heat exchange module also includes a plate and shell heat exchanger, which is connected to the ice-making component through a circulation pipeline. The circulation pipeline is connected to a liquid storage tank, and propane is arranged in the liquid storage tank. The propane can be transmitted to the ice-making component as a refrigerant to achieve ice making and absorb latent heat released during the ice making process; the liquefied natural gas storage tank is connected to the plate and shell heat exchanger through a gas transmission pipeline; a liquefied natural gas delivery pump is arranged on the gas transmission pipeline, which can transmit the liquefied natural gas in the liquefied natural gas storage tank to the plate and shell heat exchanger for heat exchange with the propane after heat absorption.

4. The liquefied natural gas gasification system according to claim 1, characterized in that: The primary heat exchange module also includes a skid heat exchange device, which includes a first plate and shell heat exchanger and a second plate and shell heat exchanger arranged in a metal structure frame, the first plate and shell heat exchanger and the second plate and shell heat exchanger are connected through a first circulation pipeline, the first circulation pipeline is connected with a first liquid storage tank, the first liquid storage tank is provided with propane, and the propane can circulate between the first plate and shell heat exchanger and the second plate and shell heat exchanger; the second plate and shell heat exchanger is connected with the ice-making component through a second circulation pipeline, the second circulation pipeline is connected with a second liquid storage tank, the second liquid storage tank is provided with a refrigerant, the refrigerant can be transmitted to the ice-making component to achieve ice making and absorb the latent heat released during the ice making process; the liquefied natural gas storage tank is connected with the first plate and shell heat exchanger through a gas transmission pipeline; the gas transmission pipeline is provided with a liquefied natural gas delivery pump, which can transmit the liquefied natural gas in the liquefied natural gas storage tank to the first plate and shell heat exchanger to exchange heat with the propane after heat absorption.

5. The liquefied natural gas gasification system according to claim 1, characterized in that: The ice-making assembly includes an ice slurry machine and an ice storage tank, wherein an agitator is arranged in the ice storage tank; the latent heat released by the ice slurry machine during ice making can preliminarily heat and vaporize the liquefied natural gas output from the liquefied natural gas storage tank; the ice slurry machine is connected to the ice storage tank and can transport the made ice to the ice storage tank; the inlet of the ice slurry machine is connected to a water intake pump through a first three-way valve, the water intake pump is connected to an external water source inlet through a pipeline, the third valve port of the first three-way valve is connected to the ice storage tank, and the outlet of the ice storage tank is connected to an ice slurry outlet through an ice delivery pump.

6. The liquefied natural gas gasification system according to claim 5, characterized in that: The ice slurry machine is a rotary scraping ice maker or a supercooled water ice maker.

7. The liquefied natural gas gasification system according to claim 2, characterized in that: The secondary heat exchange module includes a heat exchanger and a heat pump unit. The heat pump unit is connected to the heat exchanger through a circulating heat exchange medium passage. A circulating pump is provided on the circulating heat exchange medium passage, which can circulate the heat exchange medium back and forth between the heat exchanger and the heat pump unit. The gas pipeline passes through the heat exchanger after heat exchange by the ice-making component, and realizes heat exchange and temperature rise with the heat exchange medium in the heat exchanger.

8. The liquefied natural gas gasification system according to claim 7, characterized in that: The evaporator side of the heat pump unit is externally connected to a heat source tower, and an air inlet and an air outlet are respectively provided at both ends of the heat source tower; a circulating pump is provided on the heat source circulation pipeline connecting the heat pump unit and the heat source tower, and antifreeze working fluid is introduced into the heat source circulation pipeline, and the antifreeze working fluid is a calcium chloride solution or an ethylene glycol solution.

9. The liquefied natural gas gasification system according to claim 7, characterized in that: The evaporator side of the heat pump unit is connected to a water return port via a water return pipeline, and the evaporator side of the heat pump unit is connected to a water intake port via a water intake pipeline. An automatic sewage filter and a cyclone desander are arranged on the water intake pipeline.

10. The liquefied natural gas gasification system according to claim 7, characterized in that: The secondary heat exchange module also includes a heat storage tank, which is connected to the hot end pipeline of the circulating heat exchange medium passage close to one end of the heat pump unit through a second three-way valve, and the heat storage tank is connected to the cold end pipeline of the circulating heat exchange medium passage close to one end of the heat pump unit through a third three-way valve; the heat storage tank is connected to the hot end pipeline of the circulating heat exchange medium passage close to one end of the heat exchanger through a fourth three-way valve, and a circulating pump is provided on the hot end pipeline, and the heat storage tank is connected to the cold end pipeline of the circulating heat exchange medium passage close to one end of the heat exchanger through a fifth three-way valve.

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