Working medium gasifier for cold energy power generation and gasification method thereof

Abstract

The application belongs to the technical field of LNG cold energy utilization power generation, and particularly relates to a working medium gasifier for cold energy power generation and a gasification method thereof. The gasifier comprises a kettle body, a working medium preheater E1, a working medium preheater E2 and a working medium gasifier E3. The kettle body is a double eccentric cone type, and a shell pass is formed in the kettle body. The working medium preheater E1, the working medium preheater E2 and the working medium gasifier E3 share the shell pass. The working medium preheater E1 and the working medium preheater E2 are inserted into the kettle body from the eccentric cone at the upper part of the kettle body, and the working medium gasifier E3 is fixedly arranged at the lower part of the kettle body. The tube pass of the working medium preheater E1 and the tube pass of the working medium preheater E2 are used for passing external working medium, and the tube pass of the working medium gasifier E3 is used for passing seawater. The working medium gasifier can be used for gasification of the intermediate working medium and seawater into a stable high heat flux power generation working gas source under low operation pressure and low temperature difference, and is economical.

Description

Technical Field

[0001] This invention belongs to the field of LNG cold energy utilization power generation technology, specifically, it relates to a working fluid gasifier for cold energy power generation and its gasification method. Background Technology

[0002] LNG refers to liquefied natural gas, a cryogenic liquid with a temperature of -162°C. It contains enormous cold energy resources; theoretically, one ton of LNG, after heat exchange and vaporization, can yield 240 kWh of usable cooling capacity. Efficient and rational utilization of LNG's cold energy can save energy and bring considerable economic and social benefits.

[0003] The large amount of cold energy released during the vaporization of LNG from a cryogenic liquid at -162°C and its superheating to a gas near ambient temperature is utilized for power generation, which is currently one of the most efficient and effective ways to recover and utilize LNG cold energy. However, existing open-frame LNG vaporizers (ORV), submerged combustion LNG vaporizers (SCV), and intermediate medium LNG vaporizers (IFV) can only vaporize LNG and cannot be used for power generation in LNG cold energy utilization power generation devices. Summary of the Invention

[0004] The purpose of this invention is to provide a vaporizer and its vaporization method that can be used in LNG cold energy utilization power generation devices. This vaporizer has a compact structure, saves floor space, and is economical; it can adapt to various operating conditions such as unstable cold and heat sources, large load variations, and large LNG vaporization volumes in winter and summer; it can utilize natural seawater as a heat source to form a closed loop within the vessel under low operating pressure and very low temperature difference for heat exchange, vaporizing the intermediate working fluid used in the power generation device from a subcooled liquid state into a high-heat-flux, continuously stable, high-pressure steam to drive the turbine for power generation; simultaneously, it recovers the subcooled liquid intermediate working fluid from the LNG vaporizer, vaporizes it, and recycles it back into the LNG vaporizer.

[0005] To achieve the above objectives, a first aspect of the present invention provides a working fluid gasifier for cold energy power generation, the gasifier comprising a vessel body, a working fluid preheater E1, a working fluid preheater E2, and a working fluid gasifier E3; the vessel body is a double-sided cone type, with a shell side formed therein; the working fluid preheater E1, the working fluid preheater E2, and the working fluid gasifier E3 share the shell side. The working fluid preheater E1 and the working fluid preheater E2 are inserted into the vessel body from the conical ends at the upper part of the vessel body, and the working fluid gasifier E3 is fixedly installed at the lower part of the vessel body; the working fluid preheater E1 and the working fluid preheater E2 are provided with at least one of the following methods of communication with the common shell side: tube sheet opening, tube side material outlet pipeline and tube bundle bottom opening at the last tube side; The tube side of the working fluid preheater E1 and the tube side of the working fluid preheater E2 are used to introduce external working fluid, and the tube side of the working fluid gasifier E3 is used to introduce seawater.

[0006] In this invention, the top of the gasifier employs two independent working fluid preheaters, which can be used for different operating conditions. Working fluid E1 is derived from the circulating intermediate working fluid used for turbine power generation. Working fluid E2 is derived from the circulating intermediate working fluid used in the NG gasifier. The front and rear end tube boxes of E3 are connected to the flanges at both ends of the common shell-side vessel bottom, forming a high-throughput horizontal fixed tube sheet heat exchanger. Through heat exchange with seawater, a self-flowing closed-loop system is formed in E1, E2, and within the vessel.

[0007] In this invention, a slide rail for easy installation of the tube bundle and a support member for supporting the tube bundle are provided at the tube bundle location inside the vessel. To reduce pipelines, the working fluid can enter the shell side directly from the tube side through openings in the tube sheet, or a short pipe can be used to directly connect the tube box outlet to the vessel.

[0008] According to the present invention, preferably, the working fluid preheater E1 and the working fluid preheater E2 are insertion-type U-shaped high-condensation tube horizontal heat exchangers, and the U-shaped high-condensation tube horizontal heat exchangers are made of stainless steel high-efficiency high-condensation finned tubes, and the fins are provided with slots; preferably, the diameter, number of passes and heat exchange area of ​​the working fluid preheater E1 and the working fluid preheater E2 are set according to their respective different operating conditions; the appropriate fin ratio is determined by tests such as tip cracking at low temperature and hardness test, and the fins and slotted structure are smoothly transitioned.

[0009] In this invention, to reduce the size of the structure and the volume of the vaporizer, E1 and E2 are made of high-efficiency, high-condensation finned tubes of stainless steel for low-temperature resistance. Grooves are cut into the fins to break the condensate film on the outside of the tube. The appropriate fin-to-solid ratio is determined through tests such as tip cracking at low temperatures and hardness testing. The fins and grooves are all smoothly transitioned, and the hardness at the fin root is controlled to prevent low-temperature cracking.

[0010] According to the present invention, preferably, the working fluid gasifier E3 adopts a high-throughput tube horizontal fixed tube sheet heat exchanger, preferably a high-throughput tube heat exchanger with a porous surface of the tube external sintered covering layer made of an alloy material resistant to seawater corrosion, and more preferably a Cu-Ni alloy tube external sintered high-throughput tube heat exchanger; preferably, the outer diameter of the high-throughput tube bundle arrangement of E3 is tangent to the bottom of the reactor diameter circle.

[0011] In this invention, to ensure stable boiling inside the reactor and maintain a small temperature difference between the inside and outside of the E3 tube bundle, a high-throughput tube with a porous surface sintered on the outside of the tube is used to enhance heat transfer; and a seawater corrosion resistant alloy material, such as Cu-Ni alloy tube with a high-throughput tube sintered on the outside of the tube, is used to reduce the volume of the gasifier.

[0012] In this invention, the outer diameter of the E3 tube bundle arrangement is tangent to the bottom of the reactor diameter circle, ensuring that the E3 tube bundle is completely immersed in the liquid inside the reactor and reducing the diameter of the vaporizer.

[0013] According to the present invention, preferably, the vessel body is made of low-temperature alloy steel.

[0014] According to the present invention, preferably, the vessel body includes a shell-side drain port, a deflector cone, a shell-side material outlet, a vent port, a cylinder, a shell-side material inlet, a saddle, and a tube bundle slide rail; the working fluid preheater E1 includes an E1 tube box, an E1 tube-side material inlet, an E1 tube sheet, an E1 shell-side cylinder, an E1 high-condensation tube bundle, and an E1 tube bundle support; the working fluid preheater E2 includes an E2 tube box, an E2 tube-side material inlet, an E2 tube sheet, an E2 shell-side cylinder, an E2 high-condensation tube bundle, and an E2 tube bundle support; the working fluid vaporizer E3 includes an E3 front tube box, an E3 tube-side material inlet, an E3 tube sheet, an E3 high-throughput tube bundle, an E3 shell-side vent port, an E3 rear tube box, an E3 tube-side material outlet, an E3 tube bundle support plate, and a tube bundle drain port; the E3 front tube box and the E3 rear tube box are connected to flanges at both ends of the bottom of the vessel body.

[0015] According to the present invention, preferably, the working fluid preheater E1 and the working fluid preheater E2 are inserted into the vessel through the tube bundle slide rail at the conical ends of the upper part of the vessel body; preferably, the working fluid preheater E1 and the working fluid preheater E2 are inserted into the vessel horizontally facing each other or staggered relative to each other at the conical ends of the upper part of the vessel body; more preferably, the working fluid preheater E1 and the working fluid preheater E2 are inserted into the vessel horizontally facing each other at the conical ends of the upper part of the vessel body, and share the E1 / E2 tube bundle slide rail.

[0016] In this invention, to reduce the tube bundle length and facilitate manufacturing and maintenance, E1 and E2 adopt U-shaped tube heat exchangers; after the tube bundle is extracted, it can also serve as a manhole to enter the vessel, eliminating the need for a maintenance manhole on the vessel body. E1 and E2 are arranged horizontally opposite or staggered to reduce the diameter of the gasifier vessel. When staggered, the two heat exchanger tube bundles can share some internal support.

[0017] According to the present invention, preferably, the bottom of the last tube bundle of the working fluid preheater E1 and the working fluid preheater E2 is uniformly perforated and connected to the shell side.

[0018] A second aspect of the present invention provides a method for gasifying a working fluid for cold power generation, the method employing the aforementioned working fluid gasifier for cold power generation, and comprising the following steps: (1) The intermediate working fluid subcooled liquid for power generation enters the E1 tube box through the E1 tube side material inlet, and is heated by the shell side gasification gas in the E1 high condensation tube bundle. After being heated, it enters the shell side through at least one of the tube sheet opening, the tube side material outlet pipeline, and the bottom opening of the tube bundle in the last tube side, in a manner connected to the common shell side. The intermediate working fluid low temperature subcooled liquid for NG gasifier circulation enters the E2 tube box through the E2 tube side material inlet, and is heated by the shell side gasification gas in the E2 high condensation tube bundle. After being heated, it enters the shell side through at least one of the tube sheet opening and / or the tube side material outlet pipeline and the bottom opening of the tube bundle in the last tube side, in a manner connected to the common shell side. (2) In the shell side, the heated intermediate working fluid used for power generation and the intermediate working fluid used for NG gasifier circulation are vaporized by the heat source in the E3 high-flux tube bundle. When the vaporized gas passes through the E1 high-condensation tube bundle and the E2 high-condensation tube bundle, part of it undergoes forced convection heat transfer with the low-temperature subcooled liquid in the tube bundle to become condensate. Under its own weight, it falls into the liquefaction pool of the reactor body. Through repeated vaporization of cold energy, a low-temperature difference subcooled saturated liquid boiling pool is finally formed in the reactor, and it continuously and stably vaporizes in the reactor to generate high heat flux steam. This part of the high heat flux steam that is not condensed is discharged through the shell side material outlet and can be optionally entered into the turbine to generate electricity or used as a heat source to enter the NG gasifier to heat NG.

[0019] In this invention, the heated intermediate working fluid forms a liquid pool from the bottom of the vessel.

[0020] According to the present invention, preferably, the heat source in the working fluid vaporizer E3 is seawater. The seawater enters the front tube box of E3 from the material inlet of E3 tube side, then enters the high-throughput tube bundle of E3 to vaporize the saturated liquid outside the tube, and then enters the rear tube box of E3 and is discharged from the material outlet of E3 tube side.

[0021] According to the present invention, preferably, the operating pressure of each part of the vaporizer is low pressure, and preferably, the operating pressure is not higher than 2 MPa.

[0022] In this invention, all parts of the vaporizer operate at low pressure, which reduces the thickness of each component and improves economy. The E1 and E2 tube sides and the common shell side are interconnected, resulting in a small pressure difference.

[0023] The present invention has the following beneficial effects: (1) Existing gasifiers can only directly gasify LNG and cannot be used for cold energy power generation devices, while the gasifier of the present invention can generate electricity using LNG cold energy. (2) The vaporizer of the present invention uses the heat energy after the working fluid is vaporized in the working fluid vessel to heat up the working fluid in the tube bundle at the top of the vessel, uses the heat energy of the seawater in the tube bundle at the bottom of the vessel to vaporize the working fluid in the vessel, and uses the cold energy of the low temperature subcooled working fluid in the tube bundle to condense part of the working fluid gas vaporized outside the tube bundle into saturated liquid, forming a closed loop in the vessel, making full use of their respective heat and cold energy to generate a continuous and stable high load gas source to power the turbine and generate electricity. (3) The vaporizer of the present invention is flexible in operation and has a wide range of applications. It can be used as a cold energy power generation device for LNG vaporization devices with unstable cold and heat sources, wide range of components, many components, and large load changes. (4) The gasifier of the present invention can be gasified into a stable high heat flux power generation gas source under low operating pressure and low temperature difference between intermediate working fluid and seawater, which is economical. (5) This invention uses seawater as a heat source for gasification of intermediate working fluid, which is environmentally friendly and economical; (6) It has low requirements for seawater, overcoming the disadvantage of ORV open rack type having high requirements for seawater quality; (7) Compared with existing gasifiers, the gasifier of the present invention has the characteristics of compact structure, small footprint, light weight, low cost and better economy.

[0024] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0025] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0026] Figure 1 A schematic diagram of the overall structure of the vaporizer of the present invention is shown.

[0027] Figure 2 An enlarged view of the vessel body of the vaporizer of the present invention is shown.

[0028] Figure 3 The diagram shows the tube sheet opening when the E1 high-condensation tube bundle of the present invention has 4 passes.

[0029] Figure 4 The diagram shows the tube sheet opening when the E1 high-condensation tube bundle of the present invention has two passes.

[0030] Figure 5 An enlarged view of the E1 working fluid preheater in Example 1 is shown.

[0031] Figure 6 An enlarged view of the E2 working fluid preheater in Example 1 is shown.

[0032] Figure 7An enlarged view of the E3 working fluid vaporizer in Example 1 is shown.

[0033] Figure Labels

[0034] 1 E1 working fluid preheater, 2 vessel body, 3 E1 / E2 tube bundle slide rail, 4 E2 working fluid preheater, 5 E3 working fluid vaporizer, 1-1 E1 tube box, 1-2 E1 tube side material inlet, 1-3 E1 tube sheet, 1-4 E1 shell side shell, 1-5 E1 high-condensation tube bundle, 1-6 E1 tube bundle support, 1-7 E1 tube side material outlet, 2-1 shell side drain port, 2-2 offset cone, 2-3 shell side material outlet, 2-4 vent port, 2-5 shell body, 2-6 shell side material inlet, 2-7 saddle, 4-1 E2 tube bundle support, 4-2 E2 high-condensation tube bundle, 4-3 E2 shell side shell, 4-4 E2 tube sheet, 4-5 E2 tube side material inlet, 4-6 E2 tube box, 4-7 E2 tube side material outlet, 5-1 E3 front tube box, 5-2 E3 Tube-side material inlet, 5-3 E3 tube sheet, 5-4 E3 high-throughput tube bundle, 5-5 E3 tube-side vent, 5-6 E3 rear tube box, 5-7 E3 tube-side material outlet, 5-8 E3 tube bundle support plate, 5-9 E3 tube-side drain outlet. Detailed Implementation

[0035] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0036] Example 1

[0037] This embodiment adopts Figure 1-6The illustrated working fluid gasifier for cold energy power generation comprises a vessel body, working fluid preheaters E1, E2, and E3. The vessel body is a double-conical type, forming a shell side. The working fluid preheaters E1, E2, and E3 share the shell side. The vessel body includes a shell-side drain port, a conical section, a shell-side material outlet, a vent port, a cylindrical body, a shell-side material inlet, a saddle, and a tube bundle slide rail. The working fluid preheaters E1 and E2 pass through the conical sections at both ends of the upper part of the vessel body via E1 / E2. The tube bundle slide rail is horizontally inserted into the reactor; both the working fluid preheater E1 and the working fluid preheater E2 are provided with tube-side material outlet pipelines at the bottom for communication with the common shell side; the working fluid preheater E1 includes an E1 tube box, an E1 tube-side material inlet, an E1 tube sheet, an E1 shell-side cylinder, an E1 high-condensation tube bundle, and an E1 tube bundle support; the working fluid preheater E2 includes an E2 tube box, an E2 tube-side material inlet, an E2 tube sheet, an E2 shell-side cylinder, an E2 high-condensation tube bundle, and an E2 tube bundle support; the working fluid vaporizer E3 is provided with an E3 front end... The system includes a tube box, an E3 tube-side material inlet, an E3 tube sheet, an E3 high-throughput tube bundle, an E3 shell-side vent, an E3 rear-end tube box, an E3 tube-side material outlet, an E3 tube bundle support plate, and a tube bundle drain port. The E3 front-end tube box and the E3 rear-end tube box are connected to flanges at both ends of the bottom of the reactor body. The working fluid preheater E1 and the working fluid preheater E2 are made of stainless steel high-efficiency, high-condensation finned tubes, and the fins are equipped with slotted U-shaped high-condensation tube horizontal heat exchangers. The working fluid vaporizer E3 is made of Cu-Ni alloy tubes with external sintering high-throughput tube heat exchangers.

[0038] The working fluid gasification method for cold energy power generation includes the following steps: The low-temperature subcooled liquid used as the circulating intermediate working fluid in the cold energy power generation device enters the E1 tube box through the E1 tube-side material inlet. Within the E1 high-condensation tube bundle, it is heated by the vaporized gas in the shell side and then enters the shell side through the tube-side material outlet line. Similarly, the low-temperature subcooled liquid used as the circulating intermediate working fluid in the NG vaporizer enters the E2 tube box through the E2 tube-side material inlet. Within the E2 high-condensation tube bundle, it is heated by the vaporized gas in the shell side and then enters the shell side through the tube-side material outlet line. In the shell side, it is vaporized by the seawater heat source in the E3 high-flux tube bundle. The vaporized gas then passes over the E1 and E2 high-condensation tube bundles. During operation, a portion of the working fluid undergoes forced convection heat transfer outside the tube bundle with the low-temperature subcooled liquid, transforming it into condensate. Under its own weight, it falls into the liquefaction pool of the reactor body, forming a saturated liquid. The remaining uncondensed working fluid is discharged through the shell-side material outlet and can be selectively used to power the turbine for power generation or as a heat source to heat the NG vaporizer. The heat source seawater enters the E3 front-end tube box from the E3 tube-side material inlet, then enters the E3 high-throughput tube bundle, vaporizing the saturated liquid outside the tubes. It then enters the E3 rear-end tube box and is discharged from the E3 tube-side material outlet. The operating pressures of each part of the vaporizer are: 1.0~2MPa for the tube and shell sides of E1 and E2, 1.2~2MPa for the shell side of E3, and 0.4~0.6MPa for the tube side. The tube sides of E1 and E2 and the common shell side are interconnected within the reactor, resulting in a small pressure difference.

[0039] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A working fluid gasifier for cold energy power generation, characterized in that, The gasifier includes a vessel body, a working fluid preheater E1, a working fluid preheater E2, and a working fluid gasifier E3; the vessel body is a double-sided cone type, with a shell side formed inside; the working fluid preheater E1, the working fluid preheater E2, and the working fluid gasifier E3 share the shell side. The working fluid preheater E1 and the working fluid preheater E2 are inserted into the vessel body from the conical ends at the upper part of the vessel body, and the working fluid gasifier E3 is fixedly installed at the lower part of the vessel body; the working fluid preheater E1 and the working fluid preheater E2 are provided with at least one of the following methods of communication with the common shell side: tube sheet opening, tube side material outlet pipeline or tube bundle bottom opening of the last tube side; The tube side of the working fluid preheater E1 and the tube side of the working fluid preheater E2 are used to introduce external working fluid, and the tube side of the working fluid gasifier E3 is used to introduce seawater. Both the working fluid preheater E1 and the working fluid preheater E2 are insertion-type U-shaped high-condensation tube horizontal heat exchangers. The U-shaped high-condensation tube horizontal heat exchanger uses stainless steel high-efficiency high-condensation finned tubes, and the fins are provided with slots. The working fluid vaporizer E3 adopts a high-throughput horizontal fixed tube sheet heat exchanger. The outer diameter of the E3 high-throughput tube bundle arrangement is tangent to the bottom of the vessel diameter circle; E1 working fluid is derived from the intermediate working fluid used in turbine power generation; E2 working fluid is derived from the intermediate working fluid used in NG gasifiers. In the shell side, the heated intermediate working fluid used for power generation and the intermediate working fluid used for NG gasifier circulation are vaporized by the heat source in the E3 high-flux tube bundle. When the vaporized gas passes through the E1 and E2 high-condensation tube bundles, part of it undergoes forced convection heat transfer with the low-temperature subcooled liquid inside the tube bundles to become condensate. Under its own weight, it falls into the liquefaction pool in the reactor body. Through repeated vaporization of cold energy, a low-temperature differential subcooled saturated liquid boiling pool is eventually formed in the reactor, and high-heat-flux steam is continuously and stably vaporized in the reactor. This uncondensed high-heat-flux steam is discharged through the shell-side material outlet and enters the turbine to generate electricity or as a heat source to enter the NG gasifier to heat the NG.

2. The working fluid gasifier for cold energy power generation according to claim 1, wherein, Both the fins and the slotted structure have smooth transitions.

3. The working fluid gasifier for cold energy power generation according to claim 1, wherein, The high-throughput tube horizontal fixed tube sheet heat exchanger is a high-throughput tube heat exchanger with tubes made of an alloy material resistant to seawater corrosion and a porous surface coating sintered on the outside of the tubes.

4. The working fluid gasifier for cold energy power generation according to claim 3, wherein, The high-throughput tube horizontal fixed tube sheet heat exchanger is a high-throughput tube heat exchanger with tubes made of Cu-Ni alloy and a porous surface coating sintered on the outside of the tubes.

5. The working fluid gasifier for cold energy power generation according to claim 1, wherein, The vessel body is made of low-temperature alloy steel.

6. The working fluid gasifier for cold energy power generation according to claim 1, wherein, The reactor body includes a shell-side drain port, a deflector cone, a shell-side material outlet, a vent port, a cylindrical body, a shell-side material inlet, a saddle, and a tube bundle slide rail; the working fluid preheater E1 includes an E1 tube box, an E1 tube-side material inlet, an E1 tube sheet, an E1 shell-side cylindrical body, an E1 high-condensation tube bundle, and an E1 tube bundle support; the working fluid preheater E2 includes an E2 tube box, an E2 tube-side material inlet, an E2 tube sheet, an E2 shell-side cylindrical body, an E2 high-condensation tube bundle, and an E2 tube bundle support; the working fluid vaporizer E3 includes an E3 front tube box, an E3 tube-side material inlet, an E3 tube sheet, an E3 high-throughput tube bundle, an E3 shell-side vent port, an E3 rear tube box, an E3 tube-side material outlet, an E3 tube bundle support plate, and a tube bundle drain port; the E3 front tube box and the E3 rear tube box are connected to flanges at both ends of the bottom of the reactor body.

7. The working fluid gasifier for cold energy power generation according to claim 6, wherein, The working fluid preheater E1 and the working fluid preheater E2 are inserted into the vessel through the tube bundle slide rail at the two conical ends of the upper part of the vessel body.

8. The working fluid gasifier for cold energy power generation according to claim 7, wherein, The working fluid preheater E1 and the working fluid preheater E2 are inserted into the vessel from the two conical ends at the top of the vessel body, either horizontally facing each other or staggered.

9. The working fluid gasifier for cold power generation according to claim 8, wherein, The working fluid preheater E1 and the working fluid preheater E2 are inserted into the vessel horizontally opposite each other at the two conical ends of the upper part of the vessel body, and share the same E1 / E2 tube bundle slide rail.

10. The working fluid gasifier for cold energy power generation according to claim 1, wherein, The bottom of the last tube bundle of the working fluid preheater E1 and the working fluid preheater E2 is uniformly perforated and connected to the shell side.

11. A method for gasifying a working fluid for cold energy power generation, characterized in that, This method uses the working fluid gasifier for cold energy power generation as described in any one of claims 1-10, and includes the following steps: (1) The intermediate working fluid subcooled liquid for power generation enters the E1 tube box through the E1 tube side material inlet, and is heated by the shell side gasification gas in the E1 high condensation tube bundle. After being heated, it enters the shell side through at least one of the tube sheet opening, the tube side material outlet pipeline, or the bottom opening of the tube bundle in the last tube side, in a manner connected to the common shell side. The intermediate working fluid low temperature subcooled liquid for NG gasifier circulation enters the E2 tube box through the E2 tube side material inlet, and is heated by the shell side gasification gas in the E2 high condensation tube bundle. After being heated, it enters the shell side through at least one of the tube sheet opening and / or the tube side material outlet pipeline, or the bottom opening of the tube bundle in the last tube side, in a manner connected to the common shell side. (2) In the shell side, the heated intermediate working fluid used for power generation and the intermediate working fluid used for NG gasifier circulation are vaporized by the heat source in the E3 high-flux tube bundle. When the vaporized gas passes through the E1 high-condensation tube bundle and the E2 high-condensation tube bundle, part of it undergoes forced convection heat transfer with the low-temperature subcooled liquid in the tube bundle to become condensate. Under its own weight, it falls into the liquefaction pool of the reactor body. Through repeated vaporization of cold energy, a low-temperature difference subcooled saturated liquid boiling pool is finally formed in the reactor body, and it continuously and stably vaporizes in the reactor body to generate high heat flux steam. This part of the high heat flux steam that is not condensed is discharged through the shell side material outlet and enters the turbine to generate electricity or enters the NG gasifier as a heat source to heat NG.

12. The working fluid gasification method for cold energy power generation according to claim 11, wherein, The heat source in the working fluid vaporizer E3 is seawater. The seawater enters the front tube box of E3 from the material inlet of E3 tube side, then enters the high-throughput tube bundle of E3 to vaporize the saturated liquid outside the tube, and then enters the rear tube box of E3 and is discharged from the material outlet of E3 tube side.

13. The working fluid gasification method for cold energy power generation according to claim 11, wherein, The operating pressure of each part of the vaporizer shall not exceed 2 MPa.

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