An efficient heating system

Abstract

The invention discloses a high-efficiency heating system, comprising: a steam turbine unit, the steam turbine unit comprising a steam turbine, a condenser arranged on the steam turbine; a heat exchange station group, the heat exchange station group comprising a heat exchange station, a hot water pipe network connecting the heat exchange station and the condenser, and a circulating pump arranged on the hot water pipe network, the hot water pipe network comprising a circulating water inlet pipe, a circulating water outlet pipe and a heat exchange return pipe, the circulating water inlet pipe connecting the water inlet end of the condenser and the heat exchange return pipe, the circulating water outlet pipe connecting the water outlet end of the condenser and the water inlet end of the heat exchange station; a cooling station, the circulating water return end of the cooling tower is connected to the circulating water inlet pipe, and the circulating water inlet end of the cooling tower is connected to the circulating water outlet pipe. The invention recycles the waste heat of circulating water to meet the heating heat load of the surrounding area, replaces part of the steam heating, reduces the heating cost and improves the thermal efficiency, reduces the heating cost and improves the energy utilization rate.

Description

Technical Field

[0001] The invention relates to the technical field of heating systems, and in particular to a high-efficiency heating system. Background Art

[0002] With the rapid development of industrialization and urbanization in China, the amount of urban domestic waste generated has also increased rapidly. At present, the mainstream disposal technology for urban domestic waste has changed from landfill to incineration. The existing heating system is a heating and hot water supply device that circulates between a heat source machine that heats the heating medium and a heating terminal for heating, and uses the heat of the heating medium to deliver hot water. This heating system uses a heat source machine to heat the heating medium. The heating medium has a high heating cost and low thermal efficiency, and the heat consumption of the hot steam of the boiler turbine of the incineration system cannot be well utilized.

[0003] For example, Chinese patent publication number CN111486495A, publication date August 4, 2020, named "T-pillar central airbag", includes a heat source machine, which heats the heating heat medium; multiple heating terminals, which use the heat of the heating heat medium for heating; a circulation component of the heating heat medium; a circulation loop, which is composed of connecting the heat source machine, multiple heating terminals and the circulation component; and a bypass channel, which is arranged in the circulation loop in a manner bypassing the heat source machine, and the heating heat medium heated by the heat source machine is mixed with the heating heat medium in the bypass channel for circulation, and the circulation loop includes a distribution and mixing component, the distribution and mixing component has: a first distribution component, which distributes the heating heat medium heated by the heat source machine; a second distribution component, which distributes the heating heat medium flowing in the bypass channel; and a mixing component, which mixes the corresponding heating heat media distributed by the first distribution component and the second distribution component.

[0004] The disadvantages of the existing patents are: the existing heating system uses a heating medium to heat hot water for heating, which has high heating costs and low thermal efficiency, a single source of heat supply, and low energy utilization. Summary of the invention

[0005] The purpose of the present invention is to solve the problems of high heating cost, low thermal efficiency and low energy utilization rate of the existing heating system, and to provide a high-efficiency heating system which reduces heating cost, improves thermal efficiency and is environmentally friendly and energy-saving.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A high-efficiency heating system, comprising:

[0008] A steam turbine unit, the steam turbine unit comprising a steam turbine and a condenser arranged on the steam turbine;

[0009] A heat exchange station group, the heat exchange station group includes a heat exchange station, a hot water pipe network connecting the heat exchange station and the condenser, and a circulating pump arranged on the hot water pipe network, the hot water pipe network includes a circulating water inlet pipe, a circulating water outlet pipe and a heat exchange return pipe, the circulating water inlet pipe is connected to the water inlet end of the condenser and the heat exchange return pipe, and the circulating water outlet pipe is connected to the water outlet end of the condenser and the water inlet end of the heat exchange station;

[0010] Cooling station, the circulating water return end of the cooling tower is connected to the circulating water inlet pipe, and the circulating water inlet end of the cooling tower is connected to the circulating water outlet pipe. This heating system adopts low vacuum circulating water heating, and its basic principle is to reduce the vacuum degree of the condenser of the condensing unit to increase the exhaust temperature, and at the same time switch the circulating water system to the heat network system, and use the exhaust steam of the turbine to heat the circulating water for heating. In the non-heating season, the turbine unit operates under pure condensing conditions, the circulating pump, hot water network, heat exchange station group, etc. are shut down, and the original circulating pump and cooling tower resume operation; in the heating season, the low vacuum circulating water heating condition is adopted, the cooling tower and circulating water pump are shut down, and the circulating water system of the condenser is switched to a circulating water loop composed of a circulating pump, a hot water network, etc., forming a new "exhaust waste heat-heating network circulating water" heat exchange system. The condenser is transformed into a return water heater, and the user becomes a cooling tower, forming a complete circulating water circuit, the cold source loss of the unit is reduced to zero, and the circulation thermal efficiency is increased to more than 90%. By transforming the relevant steam turbine units into low-vacuum technology, the waste heat of circulating water is recovered to meet the heating load of the surrounding areas, replacing part of the steam heating, reducing the heating cost and improving the thermal efficiency.

[0011] Preferably, the heat exchange station includes a new heat exchange station and an old heat exchange station, the new heat exchange station includes a new heat exchange station water tank and a water replenishment system, and the old heat exchange station includes an old heat exchange station water tank and a water replenishment system; the heat exchange return pipe includes a new heat exchange return pipe and an old heat exchange return pipe, the new heat exchange return pipe is respectively connected to the circulating water inlet pipe and the water inlet end of the new heat exchange station water tank, and the old heat exchange return pipe is respectively connected to the circulating water inlet pipe and the water inlet end of the old heat exchange station water tank. According to the system diagram and the actual situation on site, there are two new and old heat exchange stations in the factory area. When the heating load is not large, the new heat exchange station is mainly used for heating. When the weather turns cold and the heat load increases, the new and old heat exchange stations need to be used at the same time.

[0012] Preferably, the water outlet end of the water tank of the new heat exchange station and the circulating water outlet pipe are connected to the water inlet main pipe of the circulating pump of the new heat exchange station, and the water outlet end of the water tank of the old heat exchange station and the circulating water outlet pipe are connected to the water inlet main pipe of the circulating pump of the old heat exchange station.

[0013] Preferably, the circulating water inlet pipe provided with the circulating pump is provided with a branch pipe, and the branch pipe is provided with an electric valve. In order to stop the circulating pump of the relevant unit during low vacuum heating, a branch pipe needs to be added in front of the electric door at the outlet of the relevant circulating pump, and an electric gate valve needs to be added to isolate the relevant circulating pump.

[0014] Preferably, the circulating water outlet pipe and the circulating water inlet pipe are provided with electric valves in a one-to-one correspondence, and the circulating water return end and the circulating water inlet end of the cooling tower are provided with electric valves in a one-to-one correspondence. The manual valves of the circulating water outlet pipe and the circulating water inlet pipe of the condenser are replaced with electric valves, and interlocked with the relevant circulating pumps; this ensures that when the hot water network loses water, it can switch to the original circulating cooling water system in time, and can avoid shutdown accidents caused by water loss in the hot water network.

[0015] As a preference, a control valve is provided on the circulating water outlet pipe, the control valve comprises a valve body, a valve stem extending into the valve body at the bottom end, and a ball valve arranged in the valve body and driven by the valve stem, the valve body is interlaced with circulating water outlet channels, cooling tower inlet channels, old heat exchange station inlet channels, and new heat exchange station inlet channels, the ball valve comprises an outer eccentric hemispherical valve and an inner eccentric hemispherical valve coaxially rotatably arranged in the valve body, the inner eccentric hemispherical valve is rotatably arranged in the cavity of the outer eccentric hemispherical valve. The control valve is arranged on the circulating water outlet pipe main pipe of the condenser, the circulating water outlet pipe is connected to the circulating water outlet end main pipe of the condenser, the cooling tower inlet channel is connected to the cooling tower inlet end through the circulating water outlet pipe, the old heat exchange station inlet channel is connected to the water inlet main pipe of the circulating pump of the old heat exchange station through the circulating water outlet pipe, and the new heat exchange station inlet channel is connected to the water inlet main pipe of the circulating pump of the new heat exchange station through the circulating water outlet pipe. By controlling the ball valve, different circulation modes of circulating water in the heating season and the non-heating season can be directly controlled in the control valve.

[0016] Preferably, the lower end of the valve stem is provided with a rotating shaft and an I-shaped limit block located at the lower end of the rotating shaft, the outer eccentric hemispherical valve is provided with an I-shaped first limit groove matching with the limit block, and the inner eccentric hemispherical valve is provided with an I-shaped second limit groove matching with the limit block, and the first limit groove and the second limit groove are cross-distributed. The working principle of the ball valve is: in the non-heating season, the condenser and cooling tower of the steam turbine are working, the first limit groove and the second limit groove are cross-distributed, and the I-shaped limit block at the lower end of the valve stem is located in the first limit groove. At this time, only the outer eccentric semi-ball valve can be rotated; when the heat load is small in the heating season, the outer eccentric semi-ball valve is rotated so that the circulating water outlet channel and the new heat exchange station inlet channel are in an open state, while the cooling tower inlet channel and the old heat exchange station inlet channel are in a sealed state. At this time, the first limit groove and the second limit groove are opposite to each other; when the heat load is large in the heating season, the driving device presses the driving rod downward so that the limit block is located in the second limit groove, and the rotating shaft passes through the first limit groove. At this time, only the inner eccentric semi-ball valve can be rotated, while the outer eccentric semi-ball valve does not rotate.

[0017] Preferably, when it is not the heating season, the spherical surface of the outer eccentric ball valve and the inner side wall of the valve body at one end facing the water inlet channel of the new heat exchange station are sealed through the sealing assembly, and the spherical surface of the inner eccentric ball valve and the inner side wall of the valve body at one end facing the water inlet channel of the old heat exchange station are sealed through the sealing assembly; when the load is small in the heating season, the spherical surface of the outer eccentric ball valve is driven to be sealed with the inner side wall of the valve body at one end facing the water inlet channel of the cooling tower through the sealing assembly; when the load is large in the heating season, the spherical surface of the inner eccentric ball valve is driven to be opened with the inner side wall of the valve body at one end facing the water inlet channel of the old heat exchange station through the sealing assembly.

[0018] Preferably, the sealing assembly comprises a pressure ring arranged in the valve body, and the pressure ring is movably arranged on the inner wall of the valve body through an elastic member. The sealing assembly plays a sealing role.

[0019] Preferably, the circulating water outlet channel and the cooling tower inlet channel are coaxially distributed. The heating system is in a non-heating state most of the time throughout the year, so in most cases only the circulating water outlet channel and the cooling tower inlet channel are open. The coaxial distribution of the circulating water outlet channel and the cooling tower inlet channel allows the circulating water to circulate smoothly. In the heating season, the impact force of the circulating water presses the ball valve against the pressure ring on the inner side wall facing the cooling tower inlet channel to ensure the sealing effect of the cooling tower inlet channel.

[0020] Therefore, the present invention has the following beneficial effects: (1) by modifying the low vacuum technology of the steam turbine unit, the waste heat of the circulating water is recovered to meet the heating load of the surrounding area, replacing part of the steam heating, reducing the heating cost and improving the thermal efficiency; (2) reducing the heating cost and improving the energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the system principle of the present invention.

[0022] Figure 2 It is a structural schematic diagram of the control valve in the present invention.

[0023] Figure 3 yes Figure 2 Cross-sectional view at AA in the middle.

[0024] Figure 4 yes Figure 2 A cutaway view of the heating season in Central Africa.

[0025] Figure 5 yes Figure 2 A cross-sectional view of heat load hours during the mid-heating season.

[0026] Figure 6 yes Figure 2 A cross-sectional view during the mid-heating season when the heat load is high.

[0027] Figure 7 yes Figure 3 A structural diagram of the middle valve stem.

[0028] As shown in the figure: condenser 1, circulating pump 2, circulating water inlet pipe 3, circulating water outlet pipe 4, circulating water inlet end 5, circulating water return end 6, new heat exchange station water tank 7, old heat exchange station water tank 8, make-up water system 9, new heat exchange return pipe 10, old heat exchange return pipe 11, electric valve 12, valve body 13, valve stem 14, circulating water outlet channel 15, cooling tower inlet channel 16, old heat exchange station inlet channel 17, new heat exchange station inlet channel 18, outer eccentric hemispherical valve 19, inner eccentric hemispherical valve 20, rotating shaft 21, limit block 22, first limit groove 23, second limit groove 24, pressure ring 25, elastic member 26, branch pipe 27. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the technical solution embodiments of the present invention clearer, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0030] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 In the illustrated embodiment, a high-efficiency heating system comprises: a steam turbine unit, the steam turbine unit comprises a steam turbine and a condenser 1 arranged on the steam turbine; a heat exchange station group, the heat exchange station group comprises a heat exchange station, a hot water pipe network connecting the heat exchange station and the condenser 1 and a circulating pump 2 arranged on the hot water pipe network, the hot water pipe network comprises a circulating water inlet pipe 3, a circulating water outlet pipe 4 and a heat exchange return pipe, the circulating water inlet pipe 3 connects the water inlet end of the condenser 1 and the heat exchange return pipe, the circulating water outlet pipe 4 connects the water outlet end of the condenser 1 and the water inlet end of the heat exchange station; a cooling station, the circulating water return end 6 of the cooling tower is connected to the circulating water inlet pipe 3, and the circulating water inlet end 5 of the cooling tower is connected to the circulating water outlet pipe 4.

[0031] In the above embodiment, a high-efficiency heating system adopts low-vacuum circulating water for heating. In the non-heating season, the steam turbine unit operates in pure condensing conditions, the circulating pump 2, the hot water network, the heat exchange station group, etc. are shut down, and the original circulating pump 2 and the cooling tower resume operation; in the heating season, when the low-vacuum circulating water heating condition is adopted, the cooling tower and the circulating water pump are shut down, and the circulating water system of the condenser 1 is switched to the circulating water loop composed of the circulating pump 2, the hot water network, etc., forming a new "exhaust steam waste heat-heat network circulating water" heat exchange system. The condenser 1 is transformed into a return water heater, and the user becomes a cooling tower, forming a complete circulating water circuit, the cold source loss of the unit is reduced to zero, and the circulating thermal efficiency is increased to more than 90%. Through the low-vacuum technical transformation of the relevant steam turbine unit, the circulating water waste heat is recovered to meet the heating heat load of the surrounding area, replacing part of the steam heating, reducing the heating cost and improving the thermal efficiency. The invention solves the problems that the existing heating system uses heating media to heat hot water for heating, has high heating cost and low thermal efficiency, has a single heat source and low energy utilization rate.

[0032] like Figure 1 As shown, the heat exchange station includes a new heat exchange station and an old heat exchange station, the new heat exchange station includes a new heat exchange station water tank 7 and a water replenishment system 9, and the old heat exchange station includes an old heat exchange station water tank 8 and a water replenishment system 9; the heat exchange return pipe includes a new heat exchange return pipe 10 and an old heat exchange return pipe 11, the new heat exchange return pipe 10 is respectively connected to the circulating water inlet pipe 3 and the water inlet end of the new heat exchange station water tank 7, and the old heat exchange return pipe 11 is respectively connected to the circulating water inlet pipe 3 and the water inlet end of the old heat exchange station water tank 8. According to the system diagram and the actual situation on site, there are two new and old heat exchange stations in the factory area. When the heating load is not large, the new heat exchange station is mainly used for heating. When the weather turns cold and the heat load increases, the new and old heat exchange stations need to be used at the same time. The water outlet end of the new heat exchange station water tank 7 and the circulating water outlet pipe 4 are connected to the water inlet main pipe of the circulating pump 2 of the new heat exchange station, and the water outlet end of the old heat exchange station water tank 8 and the circulating water outlet pipe 4 are connected to the water inlet main pipe of the circulating pump 2 of the old heat exchange station.

[0033] like Figure 1 As shown, a branch pipe 27 is provided on the circulating water inlet pipe 3 of the circulating pump 2, and an electric valve 12 is provided on the branch pipe 27. In order to stop the circulating pump of the relevant unit during low vacuum heating, a branch is added in front of the electric door at the outlet of the relevant circulating pump, and an electric gate valve is added to isolate the relevant circulating pump.

[0034] like Figure 1As shown, the circulating water outlet pipe 4 and the circulating water inlet pipe 3 are provided with electric valves 12 in a one-to-one correspondence, and the circulating water return end 6 and the circulating water inlet end 5 of the cooling tower are provided with electric valves 12 in a one-to-one correspondence. The manual valves of the circulating water outlet pipe 4 and the circulating water inlet pipe 3 of the condenser 1 are replaced with electric valves 12, and interlocked with the relevant circulating pump 2; this ensures that when the hot water network loses water, it can switch to the original circulating cooling water system in time, and can avoid shutdown accidents caused by water loss in the hot water network.

[0035] The working principle of the heating system in this application document is as follows: when it is not the heating season, the circulating pump 2, the hot water pipe network, the heat exchange station group, etc. are shut down, the condenser 1 of the steam turbine is operated in a pure condensing condition, the circulating water outlet pipe 4 of the condenser 1 is connected to the circulating water inlet end 5 of the cooling tower, the circulating water inlet pipe 3 of the condenser 1 is connected to the circulating water return end 6 of the cooling tower, and the circulating water heat is cooled by the cooling tower; when the heat load is small in the heating season, the pure condensing condition is shut down, that is, the cooling tower and the corresponding The circulating pump 2 of the new heat exchange station is shut down, the outlet end of the water tank 7 of the new heat exchange station and the circulating water outlet pipe 4 are connected to the water inlet main pipe of the circulating pump 2 of the new heat exchange station, and the new heat exchange return pipe 10 is connected to the circulating water inlet pipe 3 and the water inlet end of the water tank 7 of the new heat exchange station respectively. The structure of the original new heat exchange station is not changed, and the condenser 1 is connected to the new heat exchange station. The heat of the circulating water of the condenser 1 is used to heat the residents, and the original new heat exchange station uses other turbine exhaust as the second heat source to further increase the temperature. and peak load regulation. When the condenser 1 is damaged or the circulating water is insufficient, the new heat exchange station can still operate; when the heat load is large during the heating season, the condenser 1 is connected to the old heat exchange station at the same time, and the outlet end of the water tank 8 of the old heat exchange station and the circulating water outlet pipe 4 are connected to the water inlet main pipe of the circulating pump 2 of the old heat exchange station. The old heat exchange return pipe 11 is respectively connected to the circulating water inlet pipe 3 and the water inlet end of the water tank 8 of the old heat exchange station. The water tank also has a water replenishment system 9. At this time, the circulating water of the condenser 1 is connected from the circulating water outlet pipe 4 to the circulating water inlet pipe 3 of the old heat exchange station. The outflow from the main pipe is transported to the new heat exchange station and the old heat exchange station respectively, and the original new heat exchange station and the old heat exchange station use other turbine exhaust as the second heat source to further increase the temperature and peak regulation. The return water from the heat network is transported to the new heat exchange return pipe 10 and the old heat exchange return pipe 11 respectively through the heat exchange return pipe. The heat exchange return pipe does not change the original line connected to the water tank of the heat exchange station, and is connected to the circulating water return pipe at the same time. When the condenser 1 circulates water for heating, the circulating water can be circulated and transported in the heat network.

[0036] like Figure 2 , Figure 3As shown, a control valve is provided on the circulating water outlet pipe 4, and the control valve includes a valve body 13, a valve stem 14 with a bottom end extending into the valve body 13, and a ball valve arranged in the valve body 13 and driven by the valve stem 14. A circulating water outlet channel 15, a cooling tower water inlet channel 16, an old heat exchange station water inlet channel 17 and a new heat exchange station water inlet channel 18 are staggered through the valve body 13. The ball valve includes an outer eccentric semi-ball valve 19 and an inner eccentric semi-ball valve 20 which are coaxially rotatably arranged in the valve body 13, and the inner eccentric semi-ball valve 20 is rotatably arranged in the cavity of the outer eccentric semi-ball valve 19. The control valve is arranged on the main pipe of the circulating water outlet pipe 4 of the condenser 1. The circulating water outlet pipe 4 is connected to the main pipe of the circulating water outlet end of the condenser 1. The cooling tower water inlet channel 16 is connected to the cooling tower water inlet end through the circulating water outlet pipe 4. The old heat exchange station water inlet channel 17 is connected to the water inlet main pipe of the circulating pump 2 of the old heat exchange station through the circulating water outlet pipe 4. The new heat exchange station water inlet channel 18 is connected to the water inlet main pipe of the circulating pump 2 of the new heat exchange station through the circulating water outlet pipe 4. By controlling the ball valve, different circulation modes of the circulating water in the heating season and the non-heating season can be directly controlled in the control valve. The ball valve adopts an eccentric semi-ball valve. The center of the sphere of the eccentric semi-ball valve is not in a straight line with the axis of the valve stem 14, so that the sphere of the eccentric semi-ball valve can be better compressed to play a sealing role.

[0037] like Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the lower end of the valve stem 14 is provided with a rotating shaft 21 and a straight-line limit block 22 located at the lower end of the rotating shaft 21, the outer eccentric hemispherical valve 19 is provided with a straight-line first limit groove 23 that cooperates with the limit block 22, and the inner eccentric hemispherical valve 20 is provided with a straight-line second limit groove 24 that cooperates with the limit block 22, and the first limit groove 23 and the second limit groove 24 are cross-distributed. The working principle of the ball valve is: in the non-heating season, the condenser 1 and the cooling tower of the steam turbine are working, the first limit groove 23 and the second limit groove 24 are cross-distributed, and the I-shaped limit block 22 at the lower end of the valve stem 14 is located in the first limit groove 23. At this time, only the outer eccentric semi-ball valve 19 can be rotated; when the heat load is small in the heating season, the outer eccentric semi-ball valve 19 is rotated so that the circulating water outlet channel 15 and the new heat exchange station inlet channel 18 are in an open state, while the cooling tower inlet channel 16 and the old heat exchange station inlet channel 17 are in a sealed state. At this time, the first limit groove 23 and the second limit groove 24 are distributed opposite to each other; when the heat load is large in the heating season, the driving device presses the driving rod downward so that the limit block 22 is located in the second limit groove 24, and the rotating shaft 21 passes through the first limit groove 23. At this time, only the inner eccentric semi-ball valve 20 can be rotated, while the outer eccentric semi-ball valve 19 does not rotate.

[0038] like Figure 4 , Figure 5 , Figure 6As shown, in the non-heating season, the spherical surface of the outer eccentric ball valve and the inner side wall of the valve body 13 at one end facing the water inlet channel 18 of the new heat exchange station are sealed through the sealing assembly, and the spherical surface of the inner eccentric ball valve and the inner side wall of the valve body 13 at one end facing the water inlet channel 17 of the old heat exchange station are sealed through the sealing assembly; when the load in the heating season is small, the spherical surface of the outer eccentric ball valve is driven to be sealed with the inner side wall of the valve body 13 at one end facing the water inlet channel 16 of the cooling tower through the sealing assembly; when the load in the heating season is large, the spherical surface of the inner eccentric ball valve is driven to be opened with the inner side wall of the valve body 13 at one end facing the water inlet channel 17 of the old heat exchange station through the sealing assembly.

[0039] like Figure 4 , Figure 5 , Figure 6 As shown, the sealing assembly includes a pressing ring 25 disposed in the valve body 13, and the pressing ring 25 is movably disposed on the inner wall of the valve body 13 through an elastic member 26. The sealing assembly plays a sealing role.

[0040] like Figure 4 , Figure 5 , Figure 6 As shown, the circulating water outlet channel 15 and the cooling tower water inlet channel 16 are coaxially arranged. The heating system is in a non-heating state most of the year, so in most cases only the circulating water outlet channel 15 and the cooling tower water inlet channel 16 are open. The coaxial arrangement of the circulating water outlet channel 15 and the cooling tower water inlet channel 16 allows the circulating water to circulate smoothly. In the heating season, the impact force of the circulating water presses the ball valve against the pressure ring 25 on the inner side wall facing the cooling tower water inlet channel 16, ensuring the sealing effect of the cooling tower water inlet channel 16.

[0041] The above specific embodiments are only preferred implementations of the present invention, and are not intended to limit the specific implementation scope of the present invention. All equivalent changes made according to the shape and structure of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-efficiency heating system, characterized in that: include: A steam turbine unit, the steam turbine unit comprising a steam turbine and a condenser arranged on the steam turbine; A heat exchange station group, the heat exchange station group includes a heat exchange station, a hot water pipe network connecting the heat exchange station and the condenser, and a circulating pump arranged on the hot water pipe network, the hot water pipe network includes a circulating water inlet pipe, a circulating water outlet pipe and a heat exchange return pipe, the circulating water inlet pipe is connected to the water inlet end of the condenser and the heat exchange return pipe, the circulating water outlet pipe is connected to the water outlet end of the condenser and the water inlet end of the heat exchange station, the heat exchange station includes a new heat exchange station and an old heat exchange station; the new heat exchange station includes a new heat exchange station water tank, the old heat exchange station includes an old heat exchange station water tank, and the heat exchange return pipe includes a new heat exchange return pipe and an old heat exchange return pipe; A cooling tower, wherein a circulating water return end of the cooling tower is connected to a circulating water inlet pipe, and a circulating water inlet end of the cooling tower is connected to a circulating water outlet pipe; When the heat load is small during the heating season, the cooling tower is shut down, and the new heat exchange return pipe is connected to the circulating water inlet pipe and the water inlet end of the new heat exchange station water tank respectively, and the circulating water heat of the condenser is used for heating; when the heat load is large during the heating season, the condenser is connected to the old heat exchange station at the same time, and the old heat exchange return pipe is connected to the circulating water inlet pipe and the water inlet end of the old heat exchange station water tank respectively.

2. A high-efficiency heating system according to claim 1, characterized in that: The new heat exchange station also includes a water replenishment system, and the old heat exchange station also includes a water replenishment system.

3. A high-efficiency heating system according to claim 2, characterized in that: The water outlet end of the water tank of the new heat exchange station and the circulating water outlet pipe are connected to the water inlet main pipe of the circulating pump of the new heat exchange station, and the water outlet end of the water tank of the old heat exchange station and the circulating water outlet pipe are connected to the water inlet main pipe of the circulating pump of the old heat exchange station.

4. A high-efficiency heating system according to claim 1 or 2, characterized in that: A branch pipeline is arranged on a circulating water inlet pipe provided with a circulating pump, and an electric valve is arranged on the branch pipeline.

5. The high-efficiency heating system according to claim 1, characterized in that: Electric valves are provided on the circulating water outlet pipe and the circulating water inlet pipe in a one-to-one correspondence, and electric valves are provided on the circulating water return end and the circulating water inlet end of the cooling tower in a one-to-one correspondence.

6. A high-efficiency heating system according to claim 1, 2 or 5, characterized in that: The circulating water outlet pipe is provided with a control valve, which includes a valve body, a valve stem at the bottom end extending into the valve body, and a ball valve arranged in the valve body and driven by the valve stem. The valve body is staggered with circulating water outlet channels, cooling tower inlet channels, old heat exchange station inlet channels and new heat exchange station inlet channels. The ball valve includes an outer eccentric semi-ball valve and an inner eccentric semi-ball valve coaxially rotatably arranged in the valve body, and the inner eccentric semi-ball valve is rotatably arranged in the cavity of the outer eccentric ball valve.

7. A high-efficiency heating system according to claim 6, characterized in that: The lower end of the valve stem is provided with a rotating shaft and a straight-line limit block located at the lower end of the rotating shaft, the outer eccentric hemispherical valve is provided with a straight-line first limit groove matched with the limit block, and the inner eccentric hemispherical valve is provided with a straight-line second limit groove matched with the limit block, and the first limit groove and the second limit groove are cross-distributed.

8. The high-efficiency heating system according to claim 6, characterized in that: When it is not the heating season, the spherical surface of the outer eccentric ball valve and the inner side wall of the valve body facing the water inlet channel end of the new heat exchange station are sealed through the sealing assembly, and the spherical surface of the inner eccentric ball valve and the inner side wall of the valve body facing the water inlet channel end of the old heat exchange station are sealed through the sealing assembly; when the load is small in the heating season, the spherical surface of the outer eccentric ball valve is driven to be sealed with the inner side wall of the valve body facing the water inlet channel end of the cooling tower through the sealing assembly; when the load is large in the heating season, the spherical surface of the inner eccentric ball valve is driven to be opened with the inner side wall of the valve body facing the water inlet channel end of the old heat exchange station through the sealing assembly.

9. A high-efficiency heating system according to claim 8, characterized in that: The sealing assembly comprises a pressing ring arranged in the valve body, and the pressing ring is movably arranged on the inner side wall of the valve body through an elastic member.

10. The high-efficiency heating system according to claim 8, characterized in that: The circulating water outlet channel and the cooling tower inlet channel are coaxially distributed.

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