Steam turbine exhaust waste heat deep recovery system and method based on heat pipe technology

Abstract

The invention belongs to the technical field of thermal power generation, and relates to a steam turbine exhaust steam waste heat deep recovery system and method based on a heat pipe technology. Comprising a steam turbine exhaust pipeline, a heat pipe heat exchange assembly, a heat consumer connecting pipeline, a cold water pipeline and a condenser. The heat pipe heat exchange assembly comprises a heat exchange shell and a heat pipe arranged in the heat exchange shell. A first flow channel and a second flow channel which are isolated from each other are formed in the heat exchange shell; an inlet of the first flow channel is connected with a steam turbine exhaust pipeline, and an outlet of the first flow channel is connected with the condenser. An inlet of the second flow channel is connected with the cold water pipeline, and an outlet of the second flow channel is connected with the heat user connecting pipeline. The heat pipe penetrates through the first flow channel and the second flow channel, the part, located in the first flow channel, of the heat pipe forms an evaporation section, and the part, located in the second flow channel, of the heat pipe forms a condensation section. Efficient recovery and utilization of exhaust steam waste heat of the steam turbine are achieved, and a stable heat source is provided for heat users such as industrial heat supply and domestic hot water preparation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of thermal power generation, and relates to a steam turbine exhaust steam waste heat deep recovery system and method based on heat pipe technology. BACKGROUND

[0002] In thermal power generation and various industrial production processes, the steam discharged after the operation of the steam turbine as the core power equipment still carries a large amount of medium and low temperature waste heat. If this part of waste heat can be efficiently recovered, it will help to improve the overall energy utilization efficiency, reduce fuel consumption and operation cost, and reduce the thermal pollution to the environment.

[0003] At present, the recovery of steam turbine exhaust steam waste heat mainly relies on traditional heat exchange equipment such as shell-and-tube heat exchangers, plate heat exchangers, etc., which are used to transfer the heat in the exhaust steam to process water or heating medium. However, the existing technology still has the following outstanding problems in actual application: (1) The traditional heat exchanger is limited by its low heat transfer coefficient and limited effective heat exchange area, and it is difficult to realize the rapid and efficient conduction of exhaust steam waste heat. Especially in the condition of low exhaust steam temperature and high humidity of the steam turbine, the conventional heat exchange equipment often cannot fully extract the heat, resulting in a large amount of waste heat being directly discharged into the environment with condensate water or waste gas, and serious energy waste.

[0004] (2) The existing waste heat recovery system generally lacks intelligent and flexible control mechanism, and it is difficult to dynamically adjust according to the real-time load change of the heat user end or the change of the steam turbine operation condition (such as load fluctuation and exhaust steam parameters). The situation of excess or insufficient waste heat supply often occurs, which not only affects the heat balance, but also reduces the overall energy efficiency and economy of the system.

[0005] (3) The exhaust steam of the steam turbine is usually in a high temperature, high humidity and impurity-containing environment. The ordinary metal materials used in the traditional heat exchanger are easy to corrode and the surface is easy to scale, which further reduces the heat transfer efficiency and causes flow channel blockage and even equipment damage. These problems not only shorten the service life of the equipment, but also increase the maintenance frequency and operation cost, affecting the long-term stable operation of the system.

[0006] (4) The existing shell-and-tube or plate heat exchanger has poor adaptability to steam-liquid two-phase fluid in structure, which is easy to form flow dead zone or local overheating, aggravate material aging and structural fatigue, and further limit its applicability and reliability in the scene of steam turbine exhaust steam waste heat recovery. SUMMARY

[0007] The application aims to solve the technical problems of low recovery efficiency, inflexible regulation and poor stability of the steam turbine exhaust heat recovery system in the prior art, and provides a steam turbine exhaust heat deep recovery system and method based on heat pipe technology, which not only realizes efficient recovery and utilization of the steam turbine exhaust heat, but also provides a stable heat source for industrial heating, domestic hot water preparation and other heat users.

[0008] To achieve the above-mentioned purpose, the application adopts the following technical solutions: In a first aspect, the application provides a steam turbine exhaust heat deep recovery system based on heat pipe technology, comprising a steam turbine exhaust pipe, a heat pipe heat exchange assembly, a heat user connecting pipe, a cold water pipe and a condenser; the heat pipe heat exchange assembly comprises a heat exchange shell and a heat pipe arranged inside the heat exchange shell; A first flow channel and a second flow channel are formed in the heat exchange shell and are isolated from each other; the inlet of the first flow channel is connected with the steam turbine exhaust pipe, and the outlet of the first flow channel is connected with the condenser; the inlet of the second flow channel is connected with the cold water pipe, and the outlet of the second flow channel is connected with the heat user connecting pipe; The heat pipe passes through the first flow channel and the second flow channel, and the part of the heat pipe located in the first flow channel constitutes an evaporation section, and the part of the heat pipe located in the second flow channel constitutes a condensation section.

[0009] Preferably, temperature sensors are arranged at the inlet of the first flow channel, the outlet of the first flow channel, the inlet of the second flow channel, the outlet of the second flow channel, the evaporation section of the heat pipe and the condensation section of the heat pipe.

[0010] Preferably, pressure sensors are arranged at the inlet of the first flow channel and the outlet of the first flow channel.

[0011] Preferably, flow sensors are arranged at the inlet of the first flow channel and the inlet of the second flow channel.

[0012] Preferably, the temperature sensors, the pressure sensors and the flow sensors are electrically connected with a control system.

[0013] Preferably, flow regulating valves are arranged at the inlet of the first flow channel and the inlet of the second flow channel; the flow regulating valves are electrically connected with the control system.

[0014] Preferably, the control system is connected with an electric heating element, and the electric heating element is wound on the outer wall of the condensation section of the heat pipe.

[0015] Preferably, the control system is connected with a cooling fan, and the cooling fan is arranged at the outlet of the condensation section of the heat pipe.

[0016] Preferably, the working medium inside the heat pipe is R134a or water.

[0017] In a second aspect, the present application provides a method for deep recovery of exhaust steam waste heat of a steam turbine based on heat pipe technology, comprising the following steps: The exhaust steam of the steam turbine flows through the first flow channel of the heat exchange shell, and the cold water flows through the second flow channel of the heat exchange shell. The exhaust steam flowing through the evaporation section heats the working medium inside the heat pipe, and the working medium vapor generated by evaporation flows to the condensation section; in the condensation section, the working medium vapor condenses to release heat, heating the cold water flowing through the second flow channel to obtain hot water; the hot water obtained after heating is transported to the heat user through the heat user connecting pipeline; the exhaust steam after releasing heat is guided out from the first flow channel to the condenser.

[0018] Compared with the prior art, the present application has the following beneficial effects: By arranging the heat exchange shell having the first flow channel and the second flow channel isolated from each other, and arranging the heat pipe to sequentially pass through the two flow channels to form the evaporation section and the condensation section respectively, the physical isolation of the steam turbine exhaust steam circuit and the cold water heating circuit is realized. This key structural feature fundamentally eliminates the risk of mutual mixing of the working media on both sides, especially ensures the safe operation of the vacuum system on the steam turbine side and the cleanliness of the water supply quality on the heat user side. At the same time, by using the phase change cycle characteristics of the working medium inside the heat pipe, i.e., the working medium absorbs the exhaust steam waste heat in the evaporation section to rapidly evaporate, and releases heat to the cold water in the condensation section to efficiently condense, the one-way and efficient heat transfer from the low-grade exhaust steam to the cold water is realized. The present application not only realizes the efficient recovery and utilization of the exhaust steam waste heat of the steam turbine, but also provides a stable heat source for industrial heating, hot water preparation and other heat users. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 FIG. 1 is a schematic diagram of a steam turbine exhaust steam waste heat deep recovery system based on heat pipe technology according to the present application.

[0021] 1, steam turbine exhaust steam pipeline; 2, heat pipe heat exchange assembly; 21, heat pipe; 22, heat exchange shell; 3, heat user connecting pipeline; 4, cold water pipeline; 5, condenser. DETAILED DESCRIPTION

[0022] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0024] It should be noted that similar reference numerals and letters in the following drawings represent similar items, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0025] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", etc. are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0026] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0027] In the description of the embodiments of the present application, it should also be noted that unless otherwise explicitly specified and limited, if the terms "arrange", "mount", "connect", "connect" appear, they should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] The present application will be described in further detail below with reference to the accompanying drawings: The first object of the present application is to provide a steam turbine exhaust heat deep recovery system based on heat pipe technology, which comprises a steam turbine exhaust pipe 1, a heat pipe heat exchange assembly 2, a heat user connecting pipe 3, a cold water pipe 4 and a condenser 5. Figure 1 As shown, the steam turbine exhaust pipe 1, the heat pipe heat exchange assembly 2, the heat user connecting pipe 3, the cold water pipe 4 and the condenser 5 are connected in series. The heat exchange housing 22 is internally formed with a first flow channel and a second flow channel which are isolated from each other; the inlet of the first flow channel is connected with the steam turbine exhaust pipe 1, and the outlet of the first flow channel is connected with the condenser 5; the inlet of the second flow channel is connected with the cold water pipe 4, and the outlet of the second flow channel is connected with the heat user connecting pipe 3. The heat pipe 21 passes through the first flow channel and the second flow channel, and the part of the heat pipe 21 located in the first flow channel constitutes an evaporation section, and the part of the heat pipe 21 located in the second flow channel constitutes a condensation section.

[0029] The steam turbine exhaust pipe 1 and the first flow channel jointly constitute a waste heat collection loop, which introduces the low-temperature exhaust steam into the system and makes it flow through the evaporation section of the heat pipe 21, so as to transfer the waste heat in the exhaust steam to the working medium in the heat pipe 21. The cold water pipe, the second flow channel and the heat user connecting pipe constitute a heat supply loop, and the cold water absorbs heat when flowing through the condensation section of the heat pipe 21, and is converted into hot water to supply the user.

[0030] The present application utilizes the efficient phase change of the working medium inside the heat pipe 21 to realize the deep recovery of the low-grade exhaust steam waste heat, and significantly improves the comprehensive energy utilization rate. Specifically, the steam turbine exhaust steam with a relatively high temperature flows through the evaporation section of the heat pipe 21, and the heat is rapidly transferred to the working medium inside the pipe through the pipe wall, causing the working medium to absorb heat and boil to change into steam. Due to the increase of the evaporation section steam pressure, the pressure difference will drive the steam to flow at high speed to the condensation section of the heat pipe 21 with lower pressure. In the condensation section, the steam encounters the user-side circulating water with a relatively low temperature, and releases the latent heat of vaporization absorbed in the evaporation section, and changes back to a liquid state. The released heat heats the circulating water through the pipe wall, thereby providing heat energy for the user end. Finally, the liquid working medium after condensation is automatically pumped back to the evaporation section by the capillary force generated by the capillary wick structure on the inner wall of the pipe, completing a self-contained, continuous and external power-free cycle. This way of transferring heat by relying on the rapid phase change and circulation of the working medium has a very high heat transfer efficiency, far exceeding the conventional metal heat conduction, and realizes the efficient and one-way transmission of heat from the exhaust steam side with a relatively high temperature to the user side with a relatively low temperature.

[0031] In addition, the first flow channel and the second flow channel are isolated from each other, which fundamentally avoids the risk of mixing of cold water and exhaust steam, ensures the safe and stable operation of the steam turbine vacuum system, and ensures the cleanliness of the water quality on the heating side. Finally, the exhaust steam after extracting heat enters the condenser. The exhaust steam with reduced temperature and most of the waste heat recovered is subjected to the last heat exchange with a large amount of cooling working medium. The exhaust steam releases the remaining latent heat and is completely condensed into condensate water for recycling. The plurality of heat pipes 21 can be arranged in a staggered manner in the heat exchange shell 22. The staggered arrangement not only increases the contact area of the exhaust steam and the surface of the heat pipe 21, but also improves the flow field distribution, thereby strengthening the heat transfer while effectively reducing the flow resistance, and achieving overall improvement of the heat exchange efficiency.

[0032] For example, temperature sensors (with an accuracy of ±0.5°C) are arranged at the inlet of the first flow channel, the outlet of the first flow channel, the inlet of the second flow channel, the outlet of the second flow channel, the evaporation section of the heat pipe 21, and the condensation section of the heat pipe 21. The temperature sensors can real-time master the initial state of the exhaust steam from the steam turbine, the temperature drop process of the exhaust steam flowing through the heat pipe 21, and the whole process thermal state of the heated cold water, and can accurately sense the working temperature of both ends of the heat pipe 21. Based on the real-time data, the instantaneous heat exchange efficiency of the system, the heat load matching degree, and whether there is an abnormality can be accurately judged.

[0033] For example, pressure sensors (with an accuracy of ±0.001 MPa) are arranged at the inlet of the first flow channel and the outlet of the first flow channel. The pressure sensors can reflect the direct indicators of the internal running state of the first flow channel. A stable pressure drop indicates smooth flow and normal heat exchange. An abnormally increased pressure drop may indicate that the flow channel is blocked or scaled, and an abnormally reduced pressure drop may indicate a risk of insufficient flow or leakage.

[0034] For example, flow sensors (with an accuracy of ±1%) are arranged at the inlet of the first flow channel and the inlet of the second flow channel. By continuously monitoring the balance state of the flow on both sides, the system can effectively identify the heat exchange efficiency drop or potential risk of equipment caused by abnormal flow (such as too low or interruption) on either side, and immediately perform linkage protection, thereby significantly enhancing the stability and safety of the system operation.

[0035] For example, flow regulating valves are arranged at the inlet of the first flow channel (a steam flow regulating valve is arranged) and the inlet of the second flow channel (a hot water flow regulating valve is arranged). The flow regulating valves can actively and flexibly adjust the working fluid flow on both sides according to the real-time demand changes of the heat user and the fluctuations of the steam turbine exhaust parameters. For example, the steam flow can be increased and the cold water flow can be matched to increase the heating capacity, or the flow on both sides can be reduced to adapt to low load conditions, so as to ensure that the heat exchange process is always dynamically matched with the external demand, and the heat supply and demand are accurately balanced.

[0036] Temperature sensors, pressure sensors, flow sensors, and flow control valves are all electrically connected to the control system. After the system is put into operation, sensors distributed throughout the key nodes collect parameters such as temperature, pressure, and flow in real time and transmit them to the control system. The control system continuously analyzes this data and compares it with preset target values. Once it detects that the operating state deviates from the optimal condition (such as changes in heat demand or fluctuations in turbine operating conditions), the control system will immediately generate precise control commands, driving the corresponding flow control valves to work in tandem, dynamically adjusting the working fluid flow, thereby automatically pulling the system back and stabilizing it within the efficient and safe set operating range, achieving intelligent, precise, and adaptive management of the waste heat recovery process.

[0037] For example, the control system is connected to an electric heating element, which is wound around the outer wall of the condenser section of the heat pipe 21. The control system is also connected to a cooling fan, which is located at the outlet of the condenser section of the heat pipe 21. When heat demand increases, the controller stops the electric heating element and turns on the cooling fan, lowering the temperature of the condenser section of the heat pipe 21 to increase the temperature difference between it and the evaporator section, thereby increasing the heat transfer power of the heat pipe 21 and increasing the amount of waste heat recovered. When heat demand decreases, the controller starts the electric heating element and turns off the cooling fan, raising the temperature of the condenser section of the heat pipe 21 to lower the temperature difference between it and the evaporator section, thereby reducing the heat transfer power of the heat pipe 21 and decreasing the amount of waste heat recovered.

[0038] In practical applications, the key structural parameters of heat pipe 21 need to be determined comprehensively based on the characteristics of the turbine exhaust steam (temperature typically 40-60℃, pressure typically 0.005-0.015MPa) and the heat load requirements of the heat users. Specifically, the diameter of a single heat pipe 21 is usually selected within the range of 15-30mm, and the length is generally designed to be 1-3 meters depending on the on-site installation space limitations. Based on this, the necessary total heat exchange area is calculated according to the total waste heat to be recovered, and the final number of heat pipes 21 is determined to ensure that the system heat exchange capacity meets the design requirements. The heat exchange shell 22 is made of corrosion-resistant and high-temperature resistant stainless steel such as 316L, enabling the heat pipe 21 to withstand the high temperature and high humidity characteristics of the turbine exhaust steam, effectively preventing corrosion of the heat exchange shell 22, thereby ensuring the long-term service life and reliability of the equipment under harsh operating conditions. In addition, the working fluid inside heat pipe 21 is either R134a or water. The boiling points of these two working fluids are highly matched with the exhaust temperature range of the steam turbine (usually 40-60°C), ensuring that they can quickly absorb the waste heat of the exhaust steam and undergo vaporization phase change in the evaporation section, thereby starting an efficient heat transfer cycle.

[0039] The second objective of this invention is to provide a method for deep recovery of waste heat from steam turbine exhaust based on heat pipe technology, comprising the following steps: Steam exhaust from the turbine flows through the first channel of the heat exchange shell 22 and then through the evaporation section of the heat pipe 21; cold water flows through the second channel of the heat exchange shell 22 and then through the condensation section of the heat pipe 21. The working substance flowing through the steam turbine exhaust heating heat pipe 21 in the evaporation section evaporates to generate steam flow to the condensation section; in the condensation section, the working substance steam condenses to release heat, heats the cold water flowing through the second flow channel, and obtains hot water; the hot water obtained after heating is transported to the heat user through the heat user connecting pipeline 3; the steam turbine exhaust after releasing heat is led out from the first flow channel to the condenser 5.

[0040] The present application realizes the directional and efficient heat transfer from low-temperature exhaust steam to cold water by constructing the parallel flow of exhaust steam and cooling water in the physically isolated double-flow channel and utilizing the efficient phase change cycle of the working substance inside the heat pipe 21. This method not only ensures the safety and reliability of the waste heat recovery process, avoids the risk of working substance mixing, and realizes the deep and stable recovery and utilization of the waste heat of the steam turbine exhaust.

[0041] In addition, after the system is formally put into operation, the method further comprises: Continuously collecting operation data, including the temperature, pressure and flow of the steam turbine exhaust, the temperature and flow of the hot water on the heat user side, and the wall temperature of the evaporation section and the condensation section of the heat pipe 21, all data are transmitted to the controller in real time for analysis and processing.

[0042] Working condition one: the demand of the heat user increases When the demand for hot water in the factory area increases, causing the outlet temperature of the hot water to drop, the controller receives the relevant temperature signal and performs the following operations: control the exhaust steam flow regulating valve to increase the opening, increase the amount of exhaust steam entering the first flow channel of the heat pipe heat exchange assembly 2; at the same time, the electric heating element wound on the condensation section of the heat pipe 21 is turned off (if it is running), and the cooling fan at the outlet of the condensation section is started. The purpose is to reduce the temperature of the condensation section of the heat pipe 21, increase the temperature difference between the evaporation section and the condensation section, thereby significantly increasing the heat transfer power of the heat pipe 21, so that the outlet temperature of the hot water quickly rises to the set range.

[0043] Working condition two: the demand of the heat user decreases When the demand for industrial heating in the factory decreases, causing the flow or demand of the hot water to decrease, the controller performs the following operations: control the hot water flow regulating valve to reduce the opening to limit the amount of cold water flowing through the second flow channel; at the same time, the cooling fan can be started to enhance the cooling effect on the condensation section, reduce the overall heat transfer power of the heat pipe 21, and effectively avoid the problem of excessive hot water temperature caused by excessive heat.

[0044] Working condition three: the load of the steam turbine fluctuates When the turbine load increases, causing the exhaust steam temperature to rise to 55℃ (close to the upper limit), to prevent overheating of the working fluid inside heat pipe 21 and equipment overheating, the controller will appropriately reduce the opening of the exhaust steam flow regulating valve to limit the inflow of high-temperature exhaust steam, and simultaneously start the cooling fan to enhance the cooling of the condensing section, ensuring that heat pipe 21 operates within a safe temperature range. Conversely, when the exhaust steam temperature drops to 45℃ (close to the lower limit), the controller will increase the opening of the exhaust steam flow regulating valve to introduce more exhaust steam, and activate the electric heating element to maintain the necessary heat transfer temperature difference, ensuring that the waste heat recovery meets basic requirements.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A deep waste heat recovery system for steam turbine exhaust based on heat pipe technology, characterized in that, It includes a steam turbine exhaust pipe (1), a heat pipe heat exchange assembly (2), a heat user connection pipe (3), a cold water pipe (4), and a condenser (5); the heat pipe heat exchange assembly (2) includes a heat exchange shell (22) and heat pipes (21) disposed inside the heat exchange shell (22); The heat exchange shell (22) has a first flow channel and a second flow channel that are isolated from each other; the inlet of the first flow channel is connected to the steam turbine exhaust pipe (1), and the outlet of the first flow channel is connected to the condenser (5); the inlet of the second flow channel is connected to the cold water pipe (4), and the outlet of the second flow channel is connected to the heat user connection pipe (3). The heat pipe (21) passes through the first flow channel and the second flow channel. The portion of the heat pipe (21) located in the first flow channel constitutes the evaporation section, and the portion located in the second flow channel constitutes the condensation section.

2. The turbine exhaust waste heat deep recovery system based on heat pipe technology according to claim 1, characterized in that, Temperature sensors are provided at the inlet of the first flow channel, the outlet of the first flow channel, the inlet of the second flow channel, the outlet of the second flow channel, the evaporation section of the heat pipe (21), and the condensation section of the heat pipe (21).

3. The turbine exhaust waste heat deep recovery system based on heat pipe technology according to claim 2, characterized in that, Pressure sensors are installed at both the inlet and outlet of the first flow channel.

4. A deep waste heat recovery system for steam turbine exhaust gas based on heat pipe technology according to claim 3, characterized in that, Flow sensors are installed at the inlet of both the first flow channel and the inlet of the second flow channel.

5. A deep waste heat recovery system for steam turbine exhaust gas based on heat pipe technology according to claim 4, characterized in that, The temperature sensor, the pressure sensor, and the flow sensor are all electrically connected to the control system.

6. A deep waste heat recovery system for steam turbine exhaust gas based on heat pipe technology according to claim 5, characterized in that, A flow regulating valve is provided at the inlet of the first flow channel and at the inlet of the second flow channel; the flow regulating valve is electrically connected to the control system.

7. A deep waste heat recovery system for steam turbine exhaust gas based on heat pipe technology according to claim 5, characterized in that, The control system is connected to the electric heating element, which is wound around the outer wall of the condensation section of the heat pipe (21).

8. A deep waste heat recovery system for steam turbine exhaust gas based on heat pipe technology according to claim 5, characterized in that, The control system is connected to a cooling fan, which is located at the outlet of the condensation section of the heat pipe (21).

9. A deep waste heat recovery system for steam turbine exhaust based on heat pipe technology according to claim 1, characterized in that, The working fluid inside the heat pipe (21) is R134a or water.

10. A method for deep recovery of waste heat from steam turbine exhaust based on heat pipe technology, characterized in that, The system based on any one of claims 1 to 9 includes the following steps: Steam exhaust from the steam turbine flows through the first flow channel of the heat exchange shell (22) and through the evaporation section of the heat pipe (21); cold water flows through the second flow channel of the heat exchange shell (22) and through the condensation section of the heat pipe (21). The turbine exhaust flowing through the evaporation section heats the working fluid in the heat pipe (21), and the steam generated by the evaporation of the working fluid flows to the condensation section. In the condensation section, the working fluid steam condenses and releases heat, which heats the cold water flowing through the second flow channel to obtain hot water. The hot water obtained after heating is transported to the heat user through the heat user connection pipe (3). The turbine exhaust after releasing heat is led out from the first flow channel to the condenser (5).

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