Low-temperature heat power generation system and process

Abstract

The application discloses a low-temperature heat energy power generation system and process, which comprises a hot water inlet pipe and a cold water outlet pipe, a steam generator, a steam turbine, a steam condensation and layering device and a refrigeration device, the steam inlet of the steam turbine is communicated with the steam generator through a steam pipeline, the steam outlet of the steam turbine is communicated with the steam condensation and layering device through a steam pipeline, the lower part of the steam condensation and layering device is provided with a condensed water drainage pipe, and the bottom of the steam condensation and layering device is provided with a heat exchange medium return pipe. Compared with the prior art, the application adopts carbon disulfide liquid as a heat exchange medium, can effectively exchange heat with low-temperature hot water, generate carbon disulfide evaporation steam to drive the steam turbine to work and generate power to produce economic benefits, makes the originally discharged heat energy be fully and effectively recycled, sends the cooled low-temperature hot water to industrial enterprises to be used as a cold source, and the cold source can be used to generate power again after being warmed up, and the excess low-temperature hot water can be used as domestic water.

Description

Technical Field

[0001] This invention relates to the field of yellow phosphorus preparation, and more particularly to a low-temperature thermal power generation system and process. Background Technology

[0002] Currently, industrial enterprises have numerous heat sources below 100℃, such as heating jackets used to heat equipment. The heated water within these jackets is typically discharged directly or into cold water storage tanks when heating is no longer needed, resulting in almost complete waste of the heat source. Even if a small amount is utilized, it's only for cooling and then used as domestic water within the factory area. Compared to the total amount of these low-temperature heat sources, this is negligible. Furthermore, water at 100℃ is too hot for direct domestic use; it needs to be cooled, which also wastes energy. Therefore, the waste of energy from this type of heat source is the root cause of energy waste in some factories. Utilizing low-temperature heat sources for power generation, achieving energy recovery and utilization from heat sources below 100℃, would yield significant benefits. Therefore, power generation from low-temperature liquid or gaseous heat sources above 45℃ represents a crucial technological gap that urgently needs to be addressed.

[0003] Due to limitations in equipment and processes, there are currently no mature equipment and processes available on the market. The main difficulties are: 1. For heat sources of 45℃-100℃, the temperature is not high enough to meet the high-temperature requirements of other production processes. Reheating is often necessary before use, thus placing high demands on buffering and insulation, and requiring a large demand for low-temperature hot water in other production processes. 2. Because the overall volume of this type of low-temperature hot water is large, while the demand in other production processes is small, the low-temperature hot water is often unused. 3. If stored and insulated, many insulated storage tanks are needed, resulting in high costs and large land areas. Since the stored low-temperature hot water cannot be used immediately or generate direct economic benefits, it is currently discharged into cold water storage tanks and then reheated to above 100℃ before use, leading to a waste of the low-temperature hot water's thermal energy. Summary of the Invention

[0004] The purpose of this invention is to provide a low-temperature thermal power generation system and process that solves the above-mentioned problems.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a low-temperature thermal power generation system, comprising a hot water inlet pipe and a cold water outlet pipe, and further comprising a steam generator, a steam turbine, a steam condensation and stratification device, and a refrigeration device. The hot water inlet pipe and the cold water outlet pipe are respectively connected to the heat source inlet and outlet of the steam generator. The steam inlet of the steam turbine is connected to the steam outlet of the steam generator through a steam pipe. The steam outlet of the steam turbine is connected to the steam inlet at the top of the steam condensation and stratification device through a steam pipe. A condensate drain pipe is provided at the bottom of the steam condensation and stratification device. The condensate drain pipe is connected to the steam inlet at the top of the steam condensation and stratification device after heat exchange through the refrigeration device. A heat exchange medium return pipe is provided at the bottom of the steam condensation and stratification device. The heat exchange medium return pipe is connected to the interior of the steam generator.

[0006] Preferably, the steam generator is a fire-tube boiler, the bottom of the steam generator is provided with a heat exchange medium inlet, the heat exchange medium return pipe is connected to the heat exchange medium inlet, and the top of the steam generator is provided with a heat exchange medium makeup water pipe.

[0007] Preferably, the system also includes a hot water storage tank and a cold water storage tank. The hot water storage tank is connected to the hot water inlet of the steam generator via a hot water inlet pipe, and the cold water storage tank is connected to the cold water outlet of the steam generator via a cold water outlet pipe.

[0008] Preferably, the steam condensation stratification equipment mainly consists of a steam condensation tower and a water-liquid stratification tank. The steam condensation stratification equipment has a closed cavity structure, and the lower end of the steam condensation tower is open and connected to the top of the water-liquid stratification tank.

[0009] Preferably, the water-liquid stratification tank is provided with an unsealed baffle at the top, which divides the water-liquid stratification tank into a buffer zone on the left and a static stratification zone on the right. The steam condenser is located above the buffer zone, the condensate drain pipe is located in the upper middle part of the static stratification zone of the water-liquid stratification tank, and the heat exchange medium return pipe is located at the bottom of the static stratification zone of the water-liquid stratification tank.

[0010] Preferably, a spray head is provided at the steam inlet at the top of the steam condensing tower, and the condensate drain pipe is connected to the spray head.

[0011] Preferably, the refrigeration equipment is a lithium bromide refrigeration equipment, which consists of a solvent evaporator, a solvent absorption tower, and a mixed liquid storage tank. The lower end of the solvent absorption tower is connected to the top of the mixed liquid storage tank. The mixed liquid storage tank is connected to the inside of the solvent evaporator through a solvent delivery pipe. The top of the solvent evaporator is provided with a solvent vapor recovery pipe, and the bottom of the solvent evaporator is provided with a solvent rich liquid recovery pipe. The solvent vapor recovery pipe and the solvent rich liquid recovery pipe are respectively connected to the top of the solvent absorption tower. The condensate drain pipe is connected to the inlet and outlet of the hot water exchanger of the solvent evaporator.

[0012] Preferably, a generator is connected to the output shaft of the steam turbine, and a voltage regulator is provided on the voltage output terminal of the generator.

[0013] A low-temperature thermal power generation process, the steps of which are as follows:

[0014] a. Carbon disulfide is used as the vaporization intermediate medium in the steam generator. The heat source enters the fire tube of the steam generator through the hot water inlet pipe. After exchanging heat with the carbon disulfide medium in the steam generator, it is discharged from the fire tube into the cold water outlet pipe.

[0015] b. Hot water or atmospheric pressure steam heats carbon disulfide to above 45°C and vaporizes it through fire tubes. The carbon disulfide vapor is cooled by the low-temperature hot water and sent to the industrial enterprise's cold source for recycling.

[0016] c. The carbon disulfide steam generated by the fire-tube boiler is driven by a steam turbine through a steam pipeline, which in turn drives a generator to generate electricity.

[0017] d. The carbon disulfide steam after being processed by the steam turbine enters the steam condenser tower, where it is directly condensed into a liquid carbon disulfide and water mixture at about 45°C using clean water at a temperature below 30°C. The mixture is then collected in a water-liquid separation tank.

[0018] e. The liquid is allowed to settle and separate into layers in a water-liquid separation tank. The lower layer of carbon disulfide liquid is sent to a steam generator for recycling, while the upper layer of clean water is sent to a refrigeration process to be cooled to below 30°C, and then sent to a steam condenser tower for use as spray water.

[0019] Preferably, in step a, the carbon disulfide medium level in the steam generator is about 50 mm higher than the uppermost fire tube, and a water layer of about 200 mm is covered on the surface of the carbon disulfide medium. A carbon disulfide steam drum space of about 500 mm is left between the water layer and the top of the steam generator.

[0020] Preferably, the refrigeration process in step e uses a lithium bromide refrigeration device, with water as the refrigerant and lithium bromide solution as the absorbent. During heat exchange refrigeration in a vacuum state, the water in the refrigeration mixture in the solvent evaporator evaporates into vapor, which enters the mixture storage tank from the solvent absorption tower. After heat exchange with the clean water in the condensate drain pipe, the refrigeration mixture forms a low-temperature rich liquid. The low-temperature rich liquid is pumped to the top of the solvent absorption tower for spraying, where it combines with the water vapor in the solvent absorption tower. After absorbing the water vapor, the low-temperature rich liquid becomes a low-temperature lean liquid, which is then sent back to the solvent evaporator for recycling through the solvent delivery pipe.

[0021] Compared with the prior art, the advantages of the present invention are as follows:

[0022] (1) The present invention uses carbon disulfide liquid as heat exchange medium, which can effectively exchange heat with low temperature hot water and generate carbon disulfide vapor. The vaporization pressure increases, thereby driving the steam turbine to do work, so that the generator generates electricity and directly generates economic benefits.

[0023] (2) The low-temperature thermal power generation system of the present invention is safe to operate. By recovering the thermal energy in the low-temperature heat source, the thermal energy that was originally emitted is fully and effectively recovered and utilized. It realizes the utilization of waste heat from low-temperature hot water. The temperature difference from the cooling of low-temperature hot water is used to generate electricity and generate economic benefits. The cooled low-temperature hot water can be sent to industrial enterprises as a cold source. After the cold source is heated, it can generate electricity again. The cycle of use generates economic benefits. The excess low-temperature hot water can be used directly as domestic water without cooling treatment.

[0024] (3) The present invention designed a steam condensation stratification device to realize the separation and extraction of carbon disulfide, as well as a closed self-circulation, which greatly improves the safe operation and reliability of the equipment and reduces the heat exchange medium loss.

[0025] (4) In order to better realize the condensation and conversion of carbon disulfide vapor and carbon disulfide liquid, a low-cost lithium bromide refrigeration equipment is used to control the spray temperature.

[0026] (5) Through the structural design of the overall system equipment, the present invention has the advantages of safe operation, low operating cost, zero emissions, and good economic efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the system structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the principle structure of the steam generator of the present invention;

[0029] Figure 3 This is a schematic diagram of the principle structure of the steam condensation stratification device of the present invention.

[0030] In the diagram: 1. Hot water inlet pipe; 2. Cold water outlet pipe; 3. Steam generator; 31. Heat exchange medium inlet; 32. Heat exchange medium makeup water pipe; 33. Heat source inlet and outlet; 34. Carbon disulfide medium; 35. Water layer; 36. Carbon disulfide steam drum space; 4. Steam turbine; 5. Generator; 6. Steam condensation and stratification equipment; 61. Steam condensation tower; 62. Water-liquid stratification tank; 63. Baffle; 64. Buffer zone; 65. Static stratification zone; 7. Refrigeration equipment; 71. Solvent evaporator; 72. Solvent absorption tower; 73. Mixed liquid storage tank; 74. Solvent delivery pipe; 75. Solvent vapor recovery pipe; 76. Solvent rich liquid recovery pipe; 8. Steam pipeline; 9. Heat exchange medium return pipe; 10. Condensate drain pipe; 11. Pressure regulator; 12. Hot water storage tank; 13. Cold water storage tank. Detailed Implementation

[0031] Research has shown that carbon disulfide has a low boiling point, vaporizing at 45 degrees Celsius. Heating one unit of carbon disulfide to 70 degrees Celsius can achieve a pressure of 2 kg, making it suitable for steam turbine power generation. Furthermore, liquid carbon disulfide easily separates into layers, does not readily dissolve into water, and is easily recovered. However, carbon disulfide is flammable and toxic, and cannot be discharged externally, thus making it unsuitable for conventional generator sets. Therefore, this invention proposes a low-temperature thermal power generation system and process using carbon disulfide steam as the circulating medium.

[0032] The present invention will be further described below, including a low-temperature thermal power generation system, see [link to previous description]. Figures 1 to 3 The system includes a hot water inlet pipe 1 and a cold water outlet pipe 2, as well as a steam generator 3, a steam turbine 4, a steam condensation and stratification device 6, and a refrigeration device 7. The steam generator 3 is a fire-tube boiler, and carbon disulfide liquid is used as the heat exchange medium inside the steam generator 3. The hot water inlet pipe 1 and the cold water outlet pipe 2 are connected to the heat source inlet and outlet of the steam generator 3 (i.e., the inlet and outlet of the fire tube). Low-temperature hot water enters from the hot water inlet pipe 1, undergoes heat exchange inside the steam generator 3, and is discharged from the cold water outlet pipe 2. Since the steam generator 3 uses low-boiling-point carbon disulfide liquid as the medium, the heat exchange process causes the carbon disulfide to evaporate and form steam, increasing the pressure, thereby driving the steam turbine 4 to do work, enabling the generator 5 to generate electricity and directly produce economic benefits. The heat exchange process allows the thermal energy in the low-temperature hot water to be directly used for power generation and transmitted to the power grid to generate economic benefits, realizing the recovery and utilization of the heat source. It can be used as domestic water. According to experiments and calculations, taking 100° hot water as an example, this system can cool the hot water to 55-65°. The temperature difference of about 30-40° can be used for power generation. The remaining water temperature does not need to be cooled and can be used as domestic water or industrial cold source. In terms of thermal energy utilization efficiency, the thermal energy of 100° hot water is basically fully utilized.

[0033] The steam inlet of the steam turbine 4 is connected to the steam outlet at the top of the steam generator 3 via a steam pipe 8. The steam outlet of the steam turbine 4 is connected to the steam inlet at the top of the steam condensation and stratification device 6 via a steam pipe 8. The carbon disulfide steam generated by the steam generator 3 enters the steam turbine 4 through the steam pipe 8 to perform work, and the generated exhaust gas is discharged from the steam outlet of the steam turbine 4. Since carbon disulfide is flammable and has a certain degree of toxicity, it cannot be discharged externally and therefore needs to be recycled. Therefore, this invention specifically designed a steam condensation and stratification device 6.

[0034] The steam condensation stratification device 6 mainly consists of a steam condensation tower 61 and a water-liquid stratification tank 62. The steam condensation stratification device 6 is a closed cavity structure, which prevents carbon disulfide leakage. The lower end of the steam condensation tower 61 is open and connected to the top of the water-liquid stratification tank 62. After the carbon disulfide vapor enters the steam condensation tower 61 for spray cooling, it forms liquid that flows to the water-liquid stratification tank 62 for buffering. Because heat exchange occurs within the steam generator 3, the carbon disulfide vapor entering from the steam pipe 8 still contains some water vapor. Therefore, the water-liquid stratification tank 62 is designed to achieve static stratification of the condensed carbon disulfide and water. The lower part of the steam condensation stratification device 6 is equipped with a condensate drain pipe 10. After static stratification, the clear water at the top of the water-liquid stratification tank 62 can be extracted through the condensate drain pipe 10 for spray cooling.

[0035] The condensate drain pipe 10 is connected to the steam inlet at the top of the steam condensation stratification device 6 after heat exchange through the refrigeration equipment 7. Experiments have shown that the water in the water-liquid stratification tank 62, after being sprayed and cooled, still has a temperature of about 30-40°C. If it is directly used for spraying in the steam condensation tower 61, the condensation effect is not good. Therefore, a refrigeration equipment 7 is added to the condensate drain pipe. It is only necessary to lower the temperature of the water by about 5-10°C to improve the condensation and liquefaction effect of carbon disulfide vapor.

[0036] The bottom of the steam condensation stratification device 6 is provided with a heat exchange medium return pipe 9, which is connected to the inside of the steam generator 3. After settling and stratification, the carbon disulfide liquid settles at the bottom of the steam condensation stratification device 6 and can be transported to the steam generator 3 for reuse through the heat exchange medium return pipe 9.

[0037] Since the condensate flowing down from the steam condenser 61 can disturb the static stratification of the water-liquid stratification tank 62 and affect the static stratification effect, an open baffle 63 is provided inside the water-liquid stratification tank 62. The baffle 63 divides the water-liquid stratification tank 62 into a buffer zone 64 on the left and a static stratification zone 65 on the right. The steam condenser 61 is located above the buffer zone 64, the condensate drain pipe 10 is located in the upper middle part of the static stratification zone 65 of the water-liquid stratification tank 62, and the heat exchange medium return pipe 9 is located at the bottom of the static stratification zone 65 of the water-liquid stratification tank 62. The static stratification is achieved through the baffle 63, which avoids the condensate flowing down from the steam condenser 61 from affecting the static stratification.

[0038] The top of the steam condenser 61 is equipped with a spray head at the steam inlet. The condensate drain pipe 10 is connected to the spray head. Clean water is sprayed through the spray head to cool down the carbon disulfide steam entering from the steam inlet, so that the carbon disulfide steam is liquefied for recycling.

[0039] The bottom of the steam generator 3 is provided with a heat exchange medium inlet 32, and the heat exchange medium return pipe 9 is connected to the heat exchange medium inlet 32. The top of the steam generator 3 is provided with a heat exchange medium water supply pipe 33, through which clean water and carbon disulfide liquid can be added. A level gauge is also installed on the side wall of the steam generator 3 to facilitate the observation of the liquid level inside the steam generator 3.

[0040] It also includes a hot water storage tank 12 and a cold water storage tank 13. The hot water storage tank 12 is connected to the hot water inlet of the steam generator 3 through a hot water inlet pipe 1, and the cold water storage tank 13 is connected to the cold water outlet of the steam generator 3 through a cold water outlet pipe 2. The hot water storage tank 12 and the cold water storage tank 13 serve as buffers for hot water before and after cooling.

[0041] The refrigeration equipment 7 is a lithium bromide refrigeration equipment, which consists of a solvent evaporator 71, a solvent absorption tower 72, and a mixed liquid storage tank 73. The lower end of the solvent absorption tower 72 is connected to the top of the mixed liquid storage tank 73. The mixed liquid storage tank 73 is connected to the inside of the solvent evaporator 71 through a solvent delivery pipe 74. The top of the solvent evaporator 71 is provided with a solvent vapor recovery pipe 75, and the bottom of the solvent evaporator 71 is provided with a solvent rich liquid recovery pipe 76. The solvent vapor recovery pipe 75 and the solvent rich liquid recovery pipe 76 are respectively connected to the top of the solvent absorption tower 72. The condensate drain pipe 10 is connected to the hot water inlet and outlet of the solvent evaporator 71. The solvent evaporator 71 cools and lowers the temperature of the water in the condensate drain pipe 10. Through the delivery of the solvent delivery pipe 74, the solvent rich liquid recovery pipe 76, and the solvent vapor recovery pipe 75, the solvent is circulated and reused in the solvent evaporator 71, the solvent absorption tower 72, and the mixed liquid storage tank 73.

[0042] A generator 5 is connected to the output shaft of the steam turbine 4. A voltage regulator 11 is provided on the voltage output terminal of the generator 5. The voltage generated by the generator 5 is regulated by the voltage regulator 11 and then sent to the power grid.

[0043] A low-temperature thermal power generation process, the steps of which are as follows:

[0044] a. Carbon disulfide is used as the vaporization intermediate medium of steam generator 3. The heat source enters the fire tube of steam generator 3 through hot water inlet pipe 1. After exchanging heat with the carbon disulfide medium in steam generator 3, it is discharged from the fire tube into cold water outlet pipe 2.

[0045] During operation: The carbon disulfide medium level in the steam generator 3 is required to be about 50mm higher than the uppermost fire tube. A water layer 35 of about 200mm is covered on the surface of the carbon disulfide medium. The present invention designs a water layer 35 in the steam generator 3. Since water is lighter than carbon disulfide liquid, it can form a water seal environment in the steam generator 3 to prevent carbon disulfide vapor from carrying liquid, thereby increasing the steam pressure and improving the power generation efficiency. Since the present invention is carried out at a temperature below 45-100℃, water does not easily boil and will not cause a large amount of evaporation of the water layer 35. However, carbon disulfide has a low boiling point and is easy to vaporize. After absorbing heat, it can form carbon disulfide vapor, which increases in volume. The carbon disulfide passes through the water layer 35 and enters the steam engine to do work and generate electricity. A carbon disulfide steam drum space 36 of about 500 mm is left between the water layer 35 and the top of the steam generator 3. The carbon disulfide steam drum space 36 of about 500 mm provides a buffer space for the evaporation and vaporization of carbon disulfide, reduces steam pressure fluctuations and gas-liquid separation, and avoids liquid carryover in the steam.

[0046] b. Hot water or atmospheric steam is used to heat carbon disulfide to above 45°C and vaporize it through a fire tube. The carbon disulfide vaporized into carbon disulfide steam cools the low-temperature hot water. The cooled low-temperature hot water can be sent to industrial enterprises as a cold source. After the cold source is heated, it can generate electricity again. The cycle of use generates economic benefits. The excess low-temperature hot water can also be used as domestic water.

[0047] c. The carbon disulfide steam generated by the fire-tube boiler 3 drives the steam turbine 4 through the steam pipe 8 to generate electricity.

[0048] d. The carbon disulfide steam after being processed by the steam turbine 4 enters the steam condenser 61, and is directly condensed into a liquid carbon disulfide and water mixture at about 45°C using clean water at a temperature below 30°C. The mixture is then collected in the water-liquid separation tank 62.

[0049] e. The liquid is allowed to settle and separate into layers in the water-liquid separation tank 62. The lower layer of carbon disulfide liquid is sent to the steam generator 3 for recycling, while the upper layer of clean water is sent to a refrigeration process to be cooled to below 30°C, and then sent to the steam condenser tower 61 for use as spray water.

[0050] The refrigeration process employs a lithium bromide refrigeration unit 7, which consumes less electricity, has stable performance, and does not require a high-performance heat source. The lithium bromide refrigeration unit 7 uses water as the refrigerant and lithium bromide solution as the absorbent. During heat exchange refrigeration in a vacuum state, the water in the refrigeration mixture in the solvent evaporator 71 evaporates into vapor, which enters the mixture storage tank 73 from the solvent absorption tower 72. After heat exchange with the clean water in the condensate drain pipe 10, the refrigeration mixture forms a low-temperature rich liquid. This low-temperature rich liquid is pumped to the top of the solvent absorption tower 72 for spraying, where it combines with the water vapor in the absorption tower 72. After absorbing the water vapor, the low-temperature rich liquid becomes a low-temperature lean liquid, which is then sent back to the solvent evaporator 71 for recycling through the solvent delivery pipe 74.

[0051] By operating the above-described process, the low-temperature thermal power generation system can be safely operated, recovering a large amount of heat energy from the low-temperature heat source and generating economic benefits through power generation. The remaining low-temperature hot water can be used as a cold source for industrial production and as domestic hot water, thus fully and effectively recovering and utilizing the heat energy that would otherwise be discharged, generating economic benefits. Moreover, this invention, through the structural design of the system equipment, has advantages such as safe operation, low operating costs, zero emissions, and good economic efficiency. Since carbon disulfide is repeatedly recovered and used as a steam medium in this system, the energy consumption of the equipment is low. Although the lithium bromide refrigeration equipment in the refrigeration process consumes some heat source, the lithium bromide refrigeration equipment adjusts the temperature difference by 0-10° according to the initial temperature of the low-temperature hot water, with low cooling requirements and low losses. Therefore, the operating cost of the entire system equipment is extremely low, and the generated electricity is highly economical, realizing the recovery and utilization of the low-temperature heat source and achieving energy conservation and environmental protection.

[0052] The above provides a detailed description of a low-temperature thermal power generation system and process provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Modifications and improvements to the present invention are possible without exceeding the concept and scope specified in the appended claims. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A low-temperature thermal power generation process, comprising a hot water inlet pipe and a cold water outlet pipe, characterized in that: It also includes a steam generator, a steam turbine, a steam condensation and stratification device, and a refrigeration device. The hot water inlet pipe and cold water outlet pipe are respectively connected to the heat source inlet and outlet of the steam generator. The steam inlet of the steam turbine is connected to the steam outlet of the steam generator via a steam pipe. The steam outlet of the steam turbine is connected to the steam inlet at the top of the steam condensation and stratification device via a steam pipe. A condensate drain pipe is provided at the bottom of the steam condensation and stratification device. This condensate drain pipe, after heat exchange with the refrigeration device, is connected to the steam inlet at the top of the steam condensation and stratification device. A heat exchange medium return pipe is provided at the bottom of the steam condensation and stratification device. The steam generator is internally interconnected. The steam condensation and stratification equipment mainly consists of a steam condensation tower and a water-liquid stratification tank. The steam condensation and stratification equipment is a closed cavity structure. The lower end of the steam condensation tower is open and connected to the top of the water-liquid stratification tank. The water-liquid stratification tank has an open baffle plate at the top, which divides the water-liquid stratification tank into a buffer zone on the left and a static stratification zone on the right. The steam condensation tower is located above the buffer zone. The condensate drain pipe is located in the upper middle part of the static stratification zone of the water-liquid stratification tank. The heat exchange medium return pipe is located at the bottom of the static stratification zone of the water-liquid stratification tank. The process steps of the low-temperature thermal power generation system are as follows: a. Carbon disulfide is used as the vaporization intermediate medium in the steam generator. The heat source enters the fire tube of the steam generator through the hot water inlet pipe. After exchanging heat with the carbon disulfide medium in the steam generator, it is discharged from the fire tube into the cold water outlet pipe. b. Hot water or atmospheric pressure steam is used to heat carbon disulfide to above 45°C and vaporize it through a fire tube. The carbon disulfide vapor is cooled by the low-temperature hot water. c. The carbon disulfide steam generated by the fire-tube boiler is driven by the steam turbine through the steam pipeline, which in turn drives the generator to generate electricity. d. After the steam turbine has worked, the carbon disulfide steam enters the steam condenser tower, where it is directly condensed into a liquid carbon disulfide and water mixture at about 45°C using clean water at a temperature below 30°C. The mixture is then collected in a water-liquid separation tank. e. The liquid is allowed to settle and separate into layers in a water-liquid separation tank. The lower layer of carbon disulfide liquid is sent to a steam generator for recycling, while the upper layer of clean water is sent to a refrigeration process to be cooled to below 30°C, and then sent to a steam condenser tower for use as spray water.

2. The low-temperature thermal power generation process according to claim 1, characterized in that: The steam generator is a fire-tube boiler. The bottom of the steam generator is provided with a heat exchange medium inlet. The heat exchange medium return pipe is connected to the heat exchange medium inlet. The top of the steam generator is provided with a heat exchange medium makeup water pipe.

3. The low-temperature thermal power generation process according to claim 2, characterized in that: It also includes a hot water storage tank and a cold water storage tank. The hot water storage tank is connected to the hot water inlet of the steam generator through a hot water inlet pipe, and the cold water storage tank is connected to the cold water outlet of the steam generator through a cold water outlet pipe.

4. The low-temperature thermal power generation process according to claim 1, characterized in that: The steam condenser tower is equipped with a spray head at the steam inlet at the top, and the condensate drain pipe is connected to the spray head.

5. The low-temperature thermal power generation process according to claim 1, characterized in that: The refrigeration equipment is a lithium bromide refrigeration system, consisting of a solvent evaporator, a solvent absorption tower, and a mixed liquid storage tank. The lower end of the solvent absorption tower is connected to the top of the mixed liquid storage tank. The mixed liquid storage tank is connected to the interior of the solvent evaporator through a solvent delivery pipe. The top of the solvent evaporator is equipped with a solvent vapor recovery pipe, and the bottom of the solvent evaporator is equipped with a solvent rich liquid recovery pipe. The solvent vapor recovery pipe and the solvent rich liquid recovery pipe are respectively connected to the top of the solvent absorption tower. The condensate drain pipe is connected to the inlet and outlet of the hot water exchanger of the solvent evaporator.

6. The low-temperature thermal power generation process according to claim 1, characterized in that, The method steps are as follows: In step a, the liquid level of carbon disulfide medium in the steam generator is 50mm higher than the uppermost fire tube, and a 200mm water layer covers the liquid surface of the carbon disulfide medium. A 500mm carbon disulfide steam drum space is left between the water layer and the top of the steam generator.

7. The low-temperature thermal power generation process according to claim 6, characterized in that, The method steps are as follows: The refrigeration process in step e uses a lithium bromide refrigeration equipment, with water as the refrigerant and lithium bromide solution as the absorbent. During heat exchange refrigeration in a vacuum state, the water in the refrigeration mixture in the solvent evaporator evaporates into vapor, which enters the mixture storage tank from the solvent absorption tower. After heat exchange with the clean water in the condensate drain pipe, the refrigeration mixture forms a low-temperature rich liquid. The low-temperature rich liquid is pumped to the top of the solvent absorption tower for spraying, where it combines with the water vapor in the solvent absorption tower. After absorbing the water vapor, the low-temperature rich liquid becomes a low-temperature lean liquid, which is then sent back to the solvent evaporator for recycling through the solvent delivery pipe.

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