Multi-stage dead steam recovery heating energy-saving system device of air cooling steam turbine

Abstract

The utility model provides a multi-stage dead steam recovery heating energy-saving system device for an air-cooled steam turbine, and relates to the technical field of heating energy saving, the multi-stage dead steam recovery heating energy-saving system device comprises a steam turbine exhaust pipe, the steam turbine exhaust pipe is connected with a first-stage heating network heater main body, and the first-stage heating network heater main body is connected with a second-stage heating network heater main body and a heating network circulating pump A; and the secondary heat supply network heater main body is connected with high-temperature heat supply network outlet water. According to the air cooling steam turbine waste steam recovery heating system, the steam turbine steam exhaust pipe and the first-stage heating network heater body are arranged, and the steam turbine steam exhaust pipe and the first-stage heating network heater body are used in a combined mode, so that heat energy of waste steam is more fully recycled, the heat energy recovery efficiency is remarkably improved, and waste steam recovery economic benefits of waste steam recovery heating of an existing air cooling steam turbine are maximized; the defects that in an existing air cooling steam turbine dead steam recovery heating technology, a system device is single, the amount of recovered dead steam is small, recovered heat is small, the temperature rise of a heat supply network is not enough, the transformation investment economy is not enough, and the recovery period is too long are overcome, and the better steam turbine dead steam recovery heating technology is provided.

Description

Technical Field

[0001] The utility model relates to the technical field of heating energy saving, and in particular to a heating energy saving system device of a multi-stage exhaust steam recovery unit for an air-cooled steam turbine. Background Art

[0002] Most of the power generating units in northern my country are air-cooled units. On the one hand, the existing air-cooled steam turbine system faces the current situation of high coal consumption and high steam consumption, and is in urgent need of energy conservation and consumption reduction. On the other hand, the northern region needs urban heating in winter, which requires a large amount of steam and hot water heat energy supply. The surrounding power plants are currently the main heat source supply units for heating. However, the power plants also face the contradictory balance and efficiency considerations between steam for power generation and steam for heating. Therefore, the current air-cooled steam turbine system in the north is faced with the dual contradiction of excessive energy consumption on the one hand and insufficient heat energy on the other hand, and further energy conservation and consumption reduction potential is needed. The most significant energy consumption point of the air-cooled steam turbine system is the huge waste of its exhaust steam. The existing mainstream technology mainly uses the exhaust steam of the air-cooled steam turbine system for heating hot water in the heating season. The method used is usually a single direct low-temperature heat exchange or a direct heat pump heating and pressurization heat exchange. Due to the single recovery method and the technical performance limitations of the existing equipment, the exhaust steam recovery efficiency is not high, and the project investment payback period is relatively long.

[0003] There are two existing methods for recovering steam turbine exhaust steam. The first is to directly use a condenser heat exchanger to recover the exhaust steam. However, since the exhaust steam from the turbine is generally at a low temperature and has a small temperature difference with the return water from the heat network, the main disadvantages of this method are the small recovery temperature difference, low return water heat, and low exhaust steam recovery volume. This makes it suitable only for high-back-pressure air-cooled units and conditions with low heat network recovery temperatures. The second method is to directly use a steam jet heat pump and heat exchanger to recover the exhaust steam. Similarly, due to the low temperature and pressure of the exhaust steam from the turbine, existing conventional steam jet heat pumps require multiple stages in series and a high operating steam pressure to meet the exhaust steam temperature and pressure requirements. Therefore, the main disadvantage of this technology is that it is limited by the performance of existing heat pump technology. Using only a heat pump to recover the exhaust steam is inefficient, consumes high-quality steam, and is economical to recover. Therefore, we have made improvements to this problem and proposed a multi-stage exhaust steam recovery and heating energy-saving system for air-cooled steam turbines. Summary of the Invention

[0004] The purpose of this utility model is to address the problems of the current air-cooled steam turbine exhaust steam recovery heating technology, such as a single system device, a small amount of recovered exhaust steam, a small amount of recovered heat, insufficient heating network temperature rise, insufficient transformation investment economy and a long payback period.

[0005] In order to achieve the above-mentioned purpose of the invention, the present invention provides an air-cooled steam turbine multi-stage exhaust steam recovery heating energy-saving system device to improve the above-mentioned problems.

[0006] The specific application is as follows:

[0007] A multi-stage exhaust steam recovery heating energy-saving system device for an air-cooled steam turbine includes: a steam turbine exhaust pipe, the steam turbine exhaust pipe is connected to a first-level heat network heater body, the first-level heat network heater body is connected to a second-level heat network heater body and a heat network circulation pump A, the second-level heat network heater body is connected to high-temperature heat network outlet water, and the heat network circulation pump A is connected to low-temperature heat network return water.

[0008] As a preferred technical solution of the present application, the secondary heating network heater body is further connected to a first vacuuming end and a secondary heating network heater drain.

[0009] As a preferred technical solution of the present application, the steam turbine exhaust pipe is also connected to an air cooling island.

[0010] As the preferred technical solution of the present application, the steam turbine exhaust pipe is also connected to a high-efficiency steam jet heat pump, the high-efficiency steam jet heat pump is connected to working steam, and the high-efficiency steam jet heat pump is connected to the secondary heat network heater body.

[0011] As a preferred technical solution of the present application, the primary heat network heater body is also connected to a second vacuum end.

[0012] As a preferred technical solution of the present application, the primary heating network heater body is connected to a primary heating network heater drain.

[0013] As a preferred technical solution of the present application, cooling water outlet is connected between the primary heating network heater body and the secondary heating network heater body.

[0014] As the preferred technical solution of this application, the cooling water inlet and the heating network circulation pump B are connected between the primary heating network heater body and the heating network circulation pump A, and the heating network circulation pump B is also connected to the low-temperature heating network return water.

[0015] The primary heating network heater body and the secondary heating network heater body are both provided with an intelligent temperature control system.

[0016] The heating network circulation pump A and the heating network circulation pump B are both high-efficiency energy-saving water pumps and are equipped with a frequency converter.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In the scheme of this application:

[0019] In this application, by setting up a steam turbine exhaust pipe and a primary heat network heater body, and by using the steam turbine exhaust pipe and the primary heat network heater body in combination, the thermal energy of the exhaust steam is more fully recovered and utilized, which significantly improves the heat energy recovery efficiency and maximizes the economic benefits of exhaust steam recovery for existing air-cooled steam turbine exhaust steam recovery heating. It solves the shortcomings of existing air-cooled steam turbine exhaust steam recovery heating technology, such as a single system device, a small amount of recovered exhaust steam, a small amount of recovered heat, insufficient heating network temperature rise, insufficient economic efficiency of transformation investment, and a long payback period, and provides a better steam turbine exhaust steam recovery heating technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the multi-stage exhaust steam recovery heating energy-saving system for air-cooled steam turbines provided in this application;

[0021] Figure 2 A schematic diagram of the partial structure of the multi-stage exhaust steam recovery heating energy-saving system for air-cooled steam turbines provided in this application;

[0022] Figure 3 Schematic diagram of the secondary heat network heater of the air-cooled steam turbine multi-stage exhaust steam recovery heating energy-saving system device provided in this application.

[0023] Indicated in the figure:

[0024] 1. Steam turbine exhaust pipe; 2. Primary heating network heater body; 3. High-efficiency steam jet heat pump; 4. Secondary heating network heater body; 5. Heating network circulating pump A; 6. Heating network circulating pump B; 7. Air-cooling island; 8. Working steam; 9. First vacuuming end; 10. High-temperature heating network outlet water; 11. Low-temperature heating network return water; 12. Secondary heating network heater drain; 13. Cooling outlet water; 14. Cooling inlet water; 15. First heating network heater drain; 16. Second vacuuming end. DETAILED DESCRIPTION

[0025] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0026] As described in the background technology, there are two existing steam turbine exhaust steam recovery technologies. One is to directly add a condenser heat exchanger to recover the exhaust steam. Since the exhaust steam of the steam turbine is generally at a low temperature and the temperature difference with the return water of the heat network is small, the main disadvantage of this technology is that the recovery temperature difference is small, the return water heat is small, and the amount of recovered exhaust steam is small. It is only suitable for high back pressure air-cooled units and heat network recovery conditions with low temperature. The second is to directly add a steam jet heat pump and a heat exchanger to recover the exhaust steam. Similarly, since the exhaust steam temperature and pressure of the steam turbine are relatively low, the existing conventional steam jet heat pump requires multiple stages in series and a higher working steam pressure to meet the exhaust steam temperature and pressure increase requirements. Therefore, the main disadvantage of this technology is that it is limited by the performance of the existing heat pump technology. The efficiency of recovering exhaust steam using only a heat pump is low, and the consumption of high-quality steam and the economic efficiency of recovering exhaust steam are relatively low.

[0027] In order to solve this technical problem, the utility model provides an air-cooled steam turbine multi-stage exhaust steam recovery heating energy-saving system device.

[0028] Specifically, please refer to Figure 1-Figure 3 The multi-stage exhaust steam recovery heating energy-saving system for air-cooled steam turbines specifically includes:

[0029] The steam turbine exhaust pipe 1 is connected to the primary heating network heater body 2, the primary heating network heater body 2 is connected to the secondary heating network heater body 4 and the heating network circulation pump A5, the secondary heating network heater body 4 is connected to the high-temperature heating network outlet water 10, and the heating network circulation pump A5 is connected to the low-temperature heating network return water 11.

[0030] The utility model provides an air-cooled steam turbine multi-stage exhaust steam recovery heating energy-saving system device. This application sets a steam turbine exhaust pipe 1 and a first-level heat network heater body 2. Through the combined use of the steam turbine exhaust pipe 1 and the first-level heat network heater body 2, the thermal energy of the exhaust steam is more fully recovered and utilized, which significantly improves the heat energy recovery efficiency and maximizes the economic benefits of exhaust steam recovery for existing air-cooled steam turbine exhaust steam recovery heating. It solves the shortcomings of existing air-cooled steam turbine exhaust steam recovery heating technology, such as a single system device, a small amount of recovered exhaust steam, a small amount of recovered heat, insufficient heating network heating, insufficient transformation investment economy, and a long payback period, and provides a better steam turbine exhaust steam recovery heating technology.

[0031] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein can be combined with each other.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0034] Example 1, please refer to Figure 1-Figure 3 , an air-cooled steam turbine multi-stage exhaust steam recovery heating energy-saving system device, comprising: a steam turbine exhaust pipe 1, the steam turbine exhaust pipe 1 is connected to a primary heat network heater body 2, the primary heat network heater body 2 is connected to a secondary heat network heater body 4 and a heat network circulation pump A5, the secondary heat network heater body 4 is connected to a high-temperature heat network outlet water 10, and the heat network circulation pump A5 is connected to a low-temperature heat network return water 11; the application provides the steam turbine exhaust pipe 1 and the primary heat network heater body 2, and through the combined use of the steam turbine exhaust pipe 1 and the primary heat network heater body 2, the heat energy of the exhaust steam is more fully recovered and utilized, which significantly improves the heat energy recovery efficiency and maximizes the economic benefits of the exhaust steam recovery of the existing air-cooled steam turbine exhaust steam recovery heating, solves the shortcomings of the existing air-cooled steam turbine exhaust steam recovery heating technology, such as a single system device, a small amount of recovered exhaust steam, a small amount of recovered heat, insufficient heating network temperature rise, insufficient transformation investment economy and a long payback period, and provides a better steam turbine exhaust steam recovery heating technology;

[0035] The primary heating network heater body 2 is used to recover the exhaust steam of the steam turbine, provide a low-temperature steam-water heat exchange space, and recover the exhaust steam for condensation and heat exchange to return the heat to the low-temperature heating network return water 11, thereby realizing the primary heating of the low-temperature heating network return water 11, which can usually increase the temperature by 5-15°C; the low-temperature heating network return water 11 is used to transport the secondary return water of the heating network after being used by the heating user end back to the system for circulation and heat supplement and temperature increase; the primary heating of the low-temperature heating network return water 11 is realized, the initial temperature of the heating network water is increased, and the foundation is laid for subsequent further heating, and the recycling of the heating network water is realized at the same time, because the primary heating network heater 2 provides a heat exchange space for the exhaust steam and the low-temperature heating network return water 11, so that the heat of the exhaust steam can be transferred to the low-temperature heating network return water 11, thereby increasing its temperature, and the cyclic heat supplement and temperature increase of the low-temperature heating network return water 11 ensures the continuous utilization of energy and reduces energy waste;

[0036] The secondary heating network heater body 4 provides a heat exchange steam-water space for reheating the secondary water in the heating network. The high-efficiency steam jet heat pump 3 recovers the heated and pressurized steam and condenses it to release heat for heat exchange with the secondary water in the heating network, thereby achieving the reheating of the secondary water after being heated by the primary heating network heater body 2. The secondary heating of the heating network water is further increased to meet the heating demand. Because the secondary heating network heater body 4 uses the heated and pressurized steam provided by the high-efficiency steam jet heat pump 3 for heat exchange, the heating network water that has been heated in the primary stage can be heated again, thereby improving the utilization of thermal energy and ensuring the heating effect.

[0037] The heat network circulation pump A5 is used to provide circulation power for the secondary water of the heat network system; the high-temperature heat network outlet water 10 transports the heat network secondary water heated by the two-stage exhaust steam recovery device back to the heating pipeline system, and then transports the heated heat network water to the heating pipeline system to provide heat energy for users, thereby achieving the purpose of heating.

[0038] Further, such as Figure 1 As shown, the secondary heat network heater main body 4 is also connected to the first vacuum end 9 and the secondary heat network heater drain 12; the secondary heat network heater drain 12 is for the secondary heat network heater main body 4 to exchange condensed water, which is transported to the condensate collection system through a pipeline; the normal operation of the secondary heat network heater main body 4 and the recycling of condensed water are ensured, and the first vacuum end 9 provides a reasonable back pressure for the secondary heat network heater main body 4, so that the steam in the secondary heat network heater main body 4 can flow and exchange heat normally, and at the same time, the non-condensed steam is discharged, thereby improving the heat exchange efficiency.

[0039] Further, such as Figure 1 As shown, the steam turbine exhaust pipe 1 is also connected to the air-cooling island 7. The steam turbine exhaust pipe 1 is used to provide a low-pressure exhaust channel for the steam turbine and transport the exhaust steam to the air-cooling island 7 for heat dissipation and condensation. The air-cooling island 7 provides a heat exchange platform for heat dissipation and condensation of the exhaust steam of the steam turbine, ensuring a reasonable back pressure of the steam turbine; it provides a way to dissipate heat and condense the exhaust steam of the air-cooled steam turbine, ensuring the normal operation of the steam turbine, because the air-cooling island 7 can receive the exhaust steam transported by the steam turbine exhaust pipe and perform heat dissipation and condensation, providing a suitable back pressure for the steam turbine, avoiding the impact of the operating efficiency and safety of the steam turbine due to too high or too low back pressure, and ensuring the stable operation of the steam turbine.

[0040] Further, such as Figure 1 As shown, the steam turbine exhaust pipe 1 is also connected to a high-efficiency steam jet heat pump 3, which is connected to working steam 8, and the high-efficiency steam jet heat pump 3 is connected to the secondary heat network heater body 4; the high-efficiency steam jet heat pump 3 is a low back-pressure steam jet heat pump, which recycles the steam turbine exhaust steam, and injects the low-pressure exhaust steam through the medium and high-pressure working steam 8 to mix and increase the temperature and pressure to steam with a quality of more than 80°C, providing a heating heat source for the secondary heat network heater body 4; the working steam 8 is usually provided by the steam turbine extraction or main steam, with a pressure of 0.3-0.6MPa, for the high-efficiency steam jet heat pump 3 to drive the injection and recovery of the steam turbine exhaust steam, thereby realizing the recycling and heating and pressurization of the exhaust steam, providing a high-quality heating heat source for the secondary heat network heater body 4, and improving the utilization quality and efficiency of thermal energy. This is because the high-efficiency steam jet heat pump 3 can use the working steam 8 to increase the temperature and pressure of the low-pressure exhaust steam, making it a high-quality steam that can be used for the secondary heat network heater body 4, increasing the available energy of the exhaust steam, and improving the energy utilization efficiency of the entire system.

[0041] Example 2, the air-cooled steam turbine multi-stage exhaust steam recovery heating energy-saving system device provided in Example 1 is further optimized, specifically, as follows Figure 1 As shown, the primary heat network heater body 2 is also connected to a second vacuum end 16, which provides the primary heat network heater body 2 with reasonable back pressure and non-condensable steam exhaust, ensuring the normal operation and heat exchange efficiency of the primary heat network heater body 2. The second vacuum end 16 provides the primary heat network heater body 2 with reasonable back pressure, which is beneficial to the flow and heat exchange of steam in the primary heat network heater body 2, and at the same time exhausts non-condensable steam, reducing the obstruction of non-condensable steam to heat exchange, and improving the working efficiency of the primary heat network heater body 2.

[0042] Further, such as Figure 1 As shown, the primary heat network heater main body 2 is connected to the primary heat network heater drain 15; the primary heat network heater drain 15 is the condensed water for heat exchange with the primary heat network heater main body 2, and is transported to the condensate collection system through a pipeline, thereby realizing the recycling of the condensed water of the primary heat network heater main body 2, improving the utilization rate of water resources and the economy of the system, and transporting the primary heat network heater drain 15 to the condensate collection system to avoid the waste of water resources. At the same time, the recovered condensed water can also be reused as needed, thereby reducing the operating cost of the system.

[0043] Further, such as Figure 1 As shown, a cooling water outlet 13 is connected between the primary heat network heater body 2 and the secondary heat network heater body 4. The cooling water outlet 13 is usually connected to a circulating water pool, which provides an auxiliary cooling function for the system in the non-heating season, ensures the normal operation of the air-cooling island 7, and realizes the recycling of water resources. The cooling water outlet 13 takes out the heat in the auxiliary circulating water cooling system of the air-cooling island 7 in the non-heating season and transports it to the circulating water pool, which not only ensures the normal heat dissipation of the air-cooling island 7 in the non-heating season, but also avoids the waste of water resources, realizes the recycling of water resources, and improves the comprehensive utilization efficiency of the system.

[0044] Further, such as Figure 1 As shown, a cooling water inlet 14 and a heating network circulating pump B6 are connected between the primary heating network heater body 2 and the heating network circulating pump A5, and the heating network circulating pump B6 is also connected to the low-temperature heating network return water 11. The cooling water inlet 14 usually comes from the circulating water pump supply; it provides water for the auxiliary circulating water cooling system of the air-cooled island 7 in the non-heating season, ensuring the operation of the cooling system. At the same time, the setting of the heating network circulating pump B6 improves the reliability and stability of the system. The cooling water inlet 14 provides a water source for the auxiliary circulating water cooling system of the air-cooled island 7 in the non-heating season, ensuring the normal operation of the cooling system. The heating network circulating pump B6 and the heating network circulating pump A5 are backup pumps for each other. When one of the pumps fails, the other pump can continue to work, ensuring the circulation power of the secondary water of the heating network system, improving the reliability and stability of the entire system, and reducing problems such as heating interruption caused by pump failure.

[0045] The primary heating network heater body 2 and the secondary heating network heater body 4 are both equipped with an intelligent temperature control system, which can automatically adjust the heating power of the heater according to the outlet and return water temperatures of the heating network to achieve precise temperature control and energy optimization;

[0046] Both the heating network circulation pump A5 and the heating network circulation pump B6 are high-efficiency energy-saving water pumps and are equipped with frequency converters, which can adjust the pump's operating speed according to actual needs, further reducing energy consumption.

[0047] The use process of the multi-stage exhaust steam recovery heating energy-saving system device for air-cooled steam turbines provided by the utility model is as follows:

[0048] The low-pressure exhaust steam generated during the operation of the steam turbine is transported to the air-cooling island 7 and the primary heat network heater body 2 through the steam turbine exhaust pipe 1. The primary heat network heater body 2 uses the exhaust steam and the low-temperature heat network return water 11 to perform low-temperature steam-water heat exchange. The heat released by the condensation of the exhaust steam heats the low-temperature heat network return water 11, realizing the first-level heating of the low-temperature heat network return water 11, which can usually rise in temperature by 5-15°C. The condensed water after heat exchange (i.e., the primary heat network heater drain 15) is transported to the condensate collection system through a pipeline; the remaining exhaust steam is sent to the high-efficiency steam jet heat pump 3, which uses the medium and high-pressure working steam 8 to inject the low-pressure exhaust steam for mixed heating and pressure increase. The temperature of the mixed steam is raised to above 80°C, becoming high-quality steam, which is used as a heating heat source for the secondary heat network heater body 4. The high-quality steam enters the secondary heat network heater body 4, and the secondary heat network heater body 4 uses the steam and the heat after the first-level heating to heat the secondary heat network heater body 4. The secondary water of the network is heat exchanged, and the heat released by the condensation of steam further heats the secondary water of the hot network to achieve secondary temperature rise. The condensed water after heat exchange (i.e., the drain water 15 of the first-level hot network heater) is transported to the condensate collection system through the pipeline. The hot network circulation pump A5 and the hot network circulation pump B6 provide circulation power for the secondary water of the hot network system. The heated high-temperature hot network outlet water 10 is transported back to the heating pipeline system to provide thermal energy for urban heating; the low-temperature hot network return water 11 after being heated by the heating user end enters the system again for circulation heat supplement and temperature rise; in the non-heating season, the air-cooling island 7 can be switched to the auxiliary circulating water cooling system; the cooling inlet water 14 enters the air-cooling island 7 through the circulating water pump, and the cooling outlet water 13 returns to the circulating water pool; through the above work flow, the present application realizes the multi-stage recovery and efficient utilization of the exhaust steam of the air-cooled steam turbine, improves the heat recovery efficiency, reduces energy consumption, and achieves the dual improvement of economic and environmental benefits.

[0049] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0050] Obviously, the embodiments described above are only some of the embodiments of the present invention, rather than all of the embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of protection of the patent of the present invention.

Claims

1. An air-cooled steam turbine multi-stage exhaust steam recovery heating energy-saving system device, characterized in that: include: A steam turbine exhaust pipe (1), wherein the steam turbine exhaust pipe (1) is connected to a primary heating network heater body (2), the primary heating network heater body (2) is connected to a secondary heating network heater body (4) and a heating network circulation pump A (5), the secondary heating network heater body (4) is connected to high-temperature heating network outlet water (10), and the heating network circulation pump A (5) is connected to low-temperature heating network return water (11).

2. The multi-stage exhaust steam recovery heating energy-saving system for air-cooled steam turbines according to claim 1 is characterized in that: The secondary heating network heater body (4) is also connected to a first vacuuming end (9) and a secondary heating network heater drain (12).

3. The multi-stage exhaust steam recovery heating energy-saving system for air-cooled steam turbines according to claim 2 is characterized in that: The steam turbine exhaust pipe (1) is also connected to an air cooling island (7).

4. The multi-stage exhaust steam recovery heating energy-saving system for air-cooled steam turbines according to claim 3 is characterized in that: The turbine exhaust pipe (1) is further connected to a high-efficiency steam jet heat pump (3), the high-efficiency steam jet heat pump (3) is connected to working steam (8), and the high-efficiency steam jet heat pump (3) is connected to a secondary heating network heater body (4).

5. The multi-stage exhaust steam recovery heating energy-saving system for air-cooled steam turbines according to claim 4 is characterized in that: The primary heating network heater body (2) is also connected to a second vacuuming end (16).

6. The multi-stage exhaust steam recovery heating energy-saving system for air-cooled steam turbines according to claim 5 is characterized in that: The primary heating network heater body (2) is connected to a primary heating network heater drain (15).

7. The multi-stage exhaust steam recovery heating energy-saving system for air-cooled steam turbines according to claim 6 is characterized in that: Cooling water outlet (13) is connected between the primary heating network heater body (2) and the secondary heating network heater body (4).

8. The multi-stage exhaust steam recovery heating energy-saving system for air-cooled steam turbines according to claim 7 is characterized in that: The cooling water inlet (14) and the heat network circulation pump B (6) are connected between the primary heat network heater body (2) and the heat network circulation pump A (5), and the heat network circulation pump B (6) is also connected to the low-temperature heat network return water (11).

9. The multi-stage exhaust steam recovery heating energy-saving system for air-cooled steam turbines according to claim 1 is characterized in that: The primary heating network heater main body (2) and the secondary heating network heater main body (4) are both provided with an intelligent temperature control system.

10. The air-cooled steam turbine multi-stage exhaust steam recovery heating energy-saving system according to claim 8, characterized in that: The heating network circulation pump A (5) and the heating network circulation pump B (6) are both high-efficiency energy-saving water pumps and are equipped with frequency converters.

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