A heat balance system for waste heat recovery and utilization

Abstract

The present invention relates to the technical field of boiler heating, and discloses a heat balance system for waste heat recovery and utilization. The system is connected to the main flue of the boiler through a flue gas heat exchanger to collect heat carried in the flue gas, connected to the boiler through a tube-fin heat exchanger to collect heat carried in the slag, and connected to the cooling water outlet of the boiler through a shell-and-tube heat exchanger to collect heat carried by the cooling medium. The inlet and outlet liquid heat dissipation sections of the flue gas heat exchanger, the tube-and-fin heat exchanger, and the shell-and-tube heat exchanger mix heat of different grades through a primary heat exchange box, the outlet liquid of the primary heat exchange box enters a secondary heat exchange box, and the outlet liquid of the secondary heat exchange box enters the primary heat exchange box again, forming a closed-loop heat flow with heat balance, and the secondary heat exchange box transports the balanced heat to the greenhouse through a heating pipeline. The present invention eliminates heat recovery loss, makes full use of waste heat sources, solves the problem of unstable and unbalanced waste heat, obtains a heat source with constant temperature, establishes a stable supply-demand relationship, and has outstanding energy-saving and consumption-reducing characteristics and significant progress.

Description

Technical Field

[0001] The invention relates to the technical field of boiler heating, and in particular to a waste heat recovery and utilization heat balance system. Background Art

[0002] Central heating refers to the way in which steam and hot water generated by centralized heat sources are supplied to a city or part of a region through a pipeline network for production, heating and living. Central heating can not only provide cities with stable, reliable and high-quality heat sources and improve people's lives, but also save energy, reduce urban pollution, beautify cities, and effectively utilize urban effective space.

[0003] The central heating system consists of three parts: heat source, heating network, and heat users. In the north, the heat source of central heating is mainly centralized boiler room. During operation, the waste heat has the following properties: ① High-temperature flue gas waste heat, the most common form in the market, characterized by large output, concentrated production points, strong continuity, easy recovery and utilization, and takes away 40-50% of the total heat, with huge recovery space. ② High-temperature slag waste heat, such as boiler slag, the slag temperature is above 1000℃, and the heat taken away accounts for 20% of the total heat, with the second largest recovery space. ③ Cooling medium waste heat, such as the large amount of cooling water discharged by cooling devices such as the boiler water jacket, and the steam produced by various vaporization cooling devices contain a large amount of waste heat, taking away 5% of the total heat, with limited recovery space.

[0004] A Chinese patent with the patent number CN 102951743 B was retrieved and proposed a comprehensive wastewater recycling system for a heating boiler; it includes: a wastewater collection tank; a sedimentation and filtration unit, which receives wastewater from the wastewater collection tank and performs sedimentation and filtration treatment on the wastewater, and its beneficial effect can ensure that the coal-fired boiler can provide heat and finely treated water products to users in the chemical industry zone more cleanly and efficiently; however, the heat consumption after the wastewater purification treatment is large, which loses the meaning of recycling, and the heat carried by the wastewater in different time periods varies greatly, so the heat of the wastewater treated by purification is also uncontrollable. In addition, the heat carried by the wastewater is a low-grade heat source, which leads to poor stability during reuse, making it impossible to achieve heat balance utilization during heat exchange.

[0005] A Chinese patent with the patent number CN 105570956 A was searched and a boiler flue gas waste heat circulation heating system was proposed, which is characterized in that the heating system includes an air intake pipe, a blower, a dust removal device, a boiler flue gas waste heat heating box, an air outlet pipe, a cold water pipe, a chimney, a drying device, a hot water circulation heating pipe, a hot water tank, a hot water pipe, a catalytic heating device and an outlet pipe; the whole process uses the waste heat of the boiler flue gas and the heat generated by the catalytic reaction of the flue gas to heat the cold water, which greatly saves energy, has a high heat exchange temperature difference and a good heating effect, and can also effectively remove harmful substances in the flue gas, purify the flue gas, and protect the environment; although the high-grade flue gas waste heat is recovered by heat exchange, the heat carried in the flue gas at different time periods varies greatly, so the heat of the flue gas treated by purification is also uncontrollable, resulting in poor stability during reuse, and the heating object is generally overheated or overcooled, and the heat balance utilization cannot be achieved, and the energy-saving purpose of effective resource reuse is lost.

[0006] Therefore, a waste heat recovery and utilization heat balance system is proposed, which can recover the low-grade and high-grade waste heat of the boiler, blend them together to achieve heat balance and reuse them. Summary of the invention

[0007] The purpose of the present invention is to provide a waste heat recovery and utilization heat balance system, which eliminates heat recovery loss, fully utilizes waste heat sources, balances the heat of various waste heats, obtains a heat source with constant temperature, and solves the problems raised in the above background technology.

[0008] The technical solution adopted by the present invention is as follows: a waste heat recovery and heat balance system, which is connected to the main flue of the boiler through a flue gas heat exchanger to collect heat carried in the flue gas, connected to the bottom of the boiler through a tube-fin heat exchanger to collect heat carried in the slag, and connected to the cooling water outlet of the boiler through a shell-and-tube heat exchanger to collect heat carried by the cooling medium. The inlet and outlet liquid heat dissipation sections of the flue gas heat exchanger, the tube-and-fin heat exchanger, and the shell-and-tube heat exchanger mix heat of different grades through a primary heat exchanger box, the outlet liquid of the primary heat exchanger box enters a secondary heat exchanger box, and the outlet liquid of the secondary heat exchanger box enters the primary heat exchanger box again, forming a closed-loop heat flow with thermal balance, and the secondary heat exchanger box transports the balanced heat to the nearby greenhouse through the heating pipeline.

[0009] Preferably, taking into account the instability of the heat of each heat medium in the flue gas heat exchanger, tube-fin heat exchanger and shell-and-tube heat exchanger during the heat exchange process, in order to reduce the consumption of the heat exchange medium and avoid multiple compensations, the heat exchange pipelines of the flue gas heat exchanger, tube-fin heat exchanger and shell-and-tube heat exchanger are closed loops, a circulating pump is provided on the heat exchange pipelines, and the heat exchange medium used in the heat exchange pipelines is heat transfer oil.

[0010] Preferably, considering that the primary heat exchanger box and the secondary heat exchanger box are closed-loop passages and the flow rate of the heat exchange medium is large, a delivery pipe injected into the upper part of the secondary heat exchanger box is installed at the lower part of the primary heat exchanger box, and a water pump is installed on the delivery pipe; a delivery pipe injected into the upper part of the primary heat exchanger box is installed at the lower part of the secondary heat exchanger box, and a water pump is installed on the delivery pipe, and the heat exchange medium used in the delivery pipe is water.

[0011] Preferably, considering that the internal temperature of the secondary heat exchange box is relatively high during use, the heat exchange medium water will evaporate, and a condenser is installed on the upper part of the secondary heat exchange box.

[0012] As a preference, taking into account the heat balance of the heating pipeline during the heat exchange process, it is suitable for constant temperature heating of the greenhouse. The pipe network of the heating pipeline is a closed loop, and a heating pump room is installed on the heating pipeline.

[0013] Preferably, considering that the heat exchange medium flow in the primary heat exchange box and the secondary heat exchange box is long, there is a slight temperature deviation, and there is consumption of the heat exchange medium, a water supply tank is installed on the secondary heat exchange box, soft water is stored in the water supply tank, and an electric two-way valve is installed on the water supply pipeline of the water supply tank, and a hot water tank is installed on the secondary heat exchange box, the water inlet of the hot water tank comes from the hot water output of the boiler, and an electric two-way valve is installed on the water supply pipeline of the hot water tank.

[0014] Preferably, in consideration of accurate measurement and control of the temperature display in the secondary heat exchange box, a heat meter is installed on the secondary heat exchange box.

[0015] The beneficial effects of the present invention are as follows: 1. The present invention recovers the heat carried by the flue gas, the heat carried by the waste residue, and the heat carried by the cooling medium by means of heat transfer oil, so that the waste heat is fully utilized and the problem of heat loss caused by purification treatment is avoided;

[0016] 2. The present invention circulates the recovered low-grade heat and high-grade heat separately, without interfering with each other, thus avoiding the accident of explosion caused by sudden temperature change;

[0017] 3. The present invention mixes heat of different grades through the heat exchange medium flowing in the primary heat exchange box, and all the heat is integrated with each other, which is highly safe;

[0018] 4. This application uses a secondary heat exchange box and a water pump to pressurize the heat exchange medium so that the fused heat exchange medium forms a circulation, and all the heat is balanced with each other;

[0019] 5. The present invention can condense the steam generated by the heat exchange medium after heat balance through the condenser and return it to the secondary heat exchange box, thereby reducing the consumption of the heat exchange medium;

[0020] 6. The present invention provides centralized heating to greenhouses planted near the thermal power plant through heating pipelines. The constant temperature is conducive to the growth of vegetable crops with strict temperature requirements, ensures agricultural production, effectively utilizes energy, and reduces heat loss caused by long-distance transportation;

[0021] 7. The present invention injects soft water into the secondary heat exchange tank through the water supply tank, and injects hot water into the secondary heat exchange tank through the hot water tank, which plays a role of dynamic regulation, further ensures the balance of heat, and simultaneously supplements the consumption of heat exchange medium in the heat exchange process;

[0022] 8. The present invention can monitor water temperature changes in real time through the heat meter, ensuring stable and balanced heating operations;

[0023] 9. The present invention eliminates heat recovery loss, fully utilizes waste heat sources, solves the problem of unstable and unbalanced waste heat, obtains a heat source with constant temperature, establishes a stable supply and demand relationship, and has outstanding energy-saving and consumption-reducing characteristics and significant progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are mainly used to provide a further understanding of the present invention. The accompanying drawings illustrate embodiments of the present invention and together with the specification serve to explain the principles of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a waste heat recovery and utilization heat balance system of the present invention.

[0026] In the figure: flue gas heat exchanger 1, boiler 2, tube-fin heat exchanger 3, shell-and-tube heat exchanger 4, primary heat exchange box 5, secondary heat exchange box 6, heating pipeline 7, greenhouse 8, circulation pump 9, delivery pipe 10, water pump 11, condenser 12, heating pump room 13, water supply tank 14, electric two-way valve 15, hot water tank 16, heat meter 17. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings. The following description is only used to illustrate the technical solution of the present invention rather than to limit it.

[0028] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0030] Figure 1The structure of a heat balance system for waste heat recovery and utilization according to an embodiment of the present invention is schematically shown. The heat carried in the flue gas is collected by connecting to the main flue of the boiler 2 through the flue gas heat exchanger 1. The flue gas heat exchanger 1 can be purchased in stores as a prior art. The inlet and outlet liquid heat exchange pipelines of the flue gas heat exchanger 1 are closed-loop flows. The material of the heat exchange pipeline is pure copper, which has good thermal conductivity and high heat exchange efficiency. A circulating pump 9 is arranged on the heat exchange pipeline. The circulating pump 9 can be purchased in stores as a prior art, and the heat exchange medium used in the heat exchange pipeline is heat transfer oil. The heat carried in the slag is collected by connecting to the bottom of the boiler 2 through the tube-fin heat exchanger 3. The tube-fin heat exchanger 3 can be purchased in stores as a prior art. The inlet and outlet liquid heat exchange pipelines are closed-loop flows, and the material of the heat exchange pipelines is pure copper, which has good thermal conductivity and high heat exchange efficiency. A circulating pump 9 is arranged on the heat exchange pipeline, and the circulating pump 9 can be purchased in stores as a prior art, and the heat exchange medium used in the heat exchange pipeline is heat transfer oil. The cooling water outlet end of the boiler 2 is connected through the shell and tube heat exchanger 4 to collect the heat carried by the cooling medium. The shell and tube heat exchanger 4 can be purchased in stores as a prior art. The inlet and outlet liquid heat exchange pipelines of the shell and tube heat exchanger 4 are closed-loop flows, and the material of the heat exchange pipelines is pure copper, which has good thermal conductivity and high heat exchange efficiency. A circulating pump 9 is arranged on the heat exchange pipeline, and the circulating pump 9 can be purchased in stores as a prior art, and the heat exchange medium used in the heat exchange pipeline is heat transfer oil, preferably in Pressure relief valves are installed on the three heat exchange pipelines. As an existing technology, pressure relief valves can be purchased in stores to ensure stable pressure during heat exchange and improve safety. Through heat transfer oil heat exchange, the recovered low-grade heat and high-grade heat are circulated separately without interfering with each other, avoiding accidents caused by sudden temperature changes and explosions, and ensuring that the waste heat is fully utilized, avoiding heat loss problems caused by purification treatment. In addition, heat transfer oil is used as a heat exchange medium to make the collected heat more stable, reduce the consumption of heat transfer oil, and avoid multiple compensations; the heat dissipation section of the inlet and outlet liquid heat exchange pipelines of the flue gas heat exchanger 1, the tube-fin heat exchanger 3, and the shell-and-tube heat exchanger 4 mixes the three grades of heat through a primary heat exchange box 5. The heat dissipation section here is made It is in a snake shape, which increases the heat exchange area and improves the heat exchange efficiency. The primary heat exchange box 5 here is a rectangular cavity structure, and the outer shell is made of stainless steel with inner and outer liner materials, with good thermal insulation performance and less heat loss. The heat exchange medium in the primary heat exchange box 5 merges and reorganizes all the heat with each other, and has high safety; the outlet liquid of the primary heat exchange box 5 enters the secondary heat exchange box 6, and the secondary heat exchange box 6 here is a rectangular cavity structure, and the outer shell is made of stainless steel with inner and outer liner materials, with good thermal insulation performance and less heat loss, and the outlet liquid of the secondary heat exchange box 6 enters the primary heat exchange box 5 again, forming a closed-loop heat flow with heat balance, and all the heat is balanced with each other. The secondary heat exchange box 6 transports the balanced heat to the greenhouse 8 nearby through the heating pipeline 7 to reduce heat loss.

[0031] As a preferred embodiment of the present invention, considering that the primary heat exchange box 5 and the secondary heat exchange box 6 are closed-loop passages, the circulation volume of the heat exchange medium is relatively large, and a delivery pipe 10 is installed at the lower part of the primary heat exchange box 5 to be injected into the upper part of the secondary heat exchange box 6. The delivery pipe 10 can be purchased in stores as a prior art, and a water pump 11 is installed on the delivery pipe 10. The water pump 11 can be purchased in stores as a prior art. The lower part of the secondary heat exchange box 6 is installed with a delivery pipe 10 to be injected into the upper part of the primary heat exchange box 5. The delivery pipe 10 can be purchased in stores as a prior art, and a water pump 11 is installed on the delivery pipe 10. The water pump 11 can be purchased in stores as a prior art, and the heat exchange medium used in the delivery pipe 10 is water. The secondary heat exchange box 6 cooperates with the water pump 11 for pressurized delivery, so that the fused heat exchange medium forms a circulation, and all heat is balanced with each other.

[0032] As a preferred embodiment, considering that the internal temperature of the secondary heat exchange box 6 is relatively high during use, the heat exchange medium water will evaporate, and a condenser 12 is installed on the upper part of the secondary heat exchange box 6. The condenser 12 can be purchased in stores as a prior art. The condenser 12 can condense the steam generated by the heat exchange medium after heat balance and return it to the secondary heat exchange box 6, thereby reducing the consumption of the heat exchange medium.

[0033] As a preferred embodiment, considering the heat balance of the heating pipeline 7 during the heat exchange process, it is suitable for constant temperature heating of the greenhouse 8, or constant temperature heating of the chicken farm. The pipe network of the heating pipeline 7 is a closed loop, which is connected in parallel to provide heating to each greenhouse 8. A heating pump room 13 is installed on the heating pipeline 7. The heating pump room 13 is a prior art. The heating pipeline 7 exchanges heat with the heat exchange medium water in the secondary heat exchange box 6 again, and centrally heats the greenhouses 8 planted near the thermal power plant. The constant temperature is beneficial to the growth of vegetable crops with strict temperature requirements, ensures agricultural production, effectively utilizes energy, and reduces heat loss caused by long-distance transportation.

[0034] As a preferred embodiment, considering that the heat exchange medium flow in the primary heat exchange box 5 and the secondary heat exchange box 6 is long, there is a small temperature deviation, and the heat exchange medium is consumed, the secondary heat exchange box 6 is equipped with a water supply tank 14, the water supply tank 14 is a rectangular cavity structure, and soft water is stored in its cavity to prevent calcification of the heat exchange medium and reduce scale generation, and an electric two-way valve 15 is installed on the water supply pipeline of the water supply tank 14, and the electric two-way valve 15 can be purchased as an existing technology, and the secondary heat exchange box 6 is equipped with a hot water tank 16, the hot water tank 16 is a rectangular cavity structure, and the water inlet of the hot water tank 16 comes from the output of the boiler 2. The hot water produced is obtained, and an electric two-way valve 15 is installed on the water supply pipeline of the hot water tank 16. When the temperature of the heat exchange medium in the secondary heat exchange tank 6 exceeds the equilibrium temperature, the electric two-way valve 15 is opened to inject soft water into the secondary heat exchange tank 6 through the water supply tank 14 to reduce the temperature of the heat exchange medium to the equilibrium temperature. When the temperature of the heat exchange medium in the secondary heat exchange tank 6 is lower than the equilibrium temperature, the electric two-way valve 15 is opened to inject hot water into the secondary heat exchange tank 6 through the hot water tank 16 to increase the temperature of the heat exchange medium to the equilibrium temperature, thereby playing a role of dynamic regulation, further ensuring the balance of heat, and synchronously supplementing the consumption of the heat exchange medium in the heat exchange process.

[0035] As a preferred embodiment, in consideration of accurate measurement and control of the temperature display in the secondary heat exchange box 6, a heat meter 17 is installed on the secondary heat exchange box 6. The heat meter 17 can be purchased in stores as a prior art. The heat meter 17 can be used to monitor water temperature changes in real time, which serves as a basis for adjusting the water supply tank 14 and the hot water tank 16, thereby ensuring a stable and balanced heating operation.

[0036] Working principle: After the heating season arrives, the thermal power plant begins to provide centralized heating to residents in the area. In order to reduce energy consumption, this system is installed in conjunction with the boiler, and the flue gas heat exchanger 1 is connected to the main flue of the boiler 2 to collect the heat carried in the flue gas, and the tube-fin heat exchanger 3 is connected to the bottom of the boiler 2 to collect the heat carried in the slag, and the shell-and-tube heat exchanger 4 is connected to the cooling water outlet of the boiler 2 to collect the heat carried by the cooling medium, and the three heat exchange lines flow in an independent closed loop. When the heat flow passes through the primary heat exchange box 5, the heat exchange medium water inside it merges all the heat and reorganizes it, and then it is conveyed by the secondary heat exchange box 6 with the pressurized water pump 11, so that the merged heat exchange medium water forms a circulation, and all the heat is balanced with each other, and then it is exchanged again with the heat exchange medium water in the secondary heat exchange box 6 through the heating pipeline 7, and the greenhouse 8 planted near the thermal power plant is centrally heated. The greenhouse can be used to grow morels with strict temperature requirements (the suitable temperature for the mycelium of morels is 18 -22 degrees, the optimum temperature for spore germination is 18-22 degrees, and the fruiting body can grow normally between 10-20 degrees, but it grows fastest between 15-18 degrees. Morchella is a low-temperature fungus. In the early stage of growth, the underground mycelium begins to grow at a low temperature of 1-2 degrees. The mushroom production time is generally in March-April. At this time, if the temperature exceeds 28 degrees, its growth will be extremely slow or even stop.) Check the heat meter 17 in real time as the basis for adjusting the water supply tank 14 and the hot water tank 16. When the temperature of the heat exchange medium in the secondary heat exchange tank 6 is lower than the equilibrium temperature, open the electric two-way valve 15 and inject hot water into the secondary heat exchange tank 6 through the hot water tank 16 to increase the temperature of the heat exchange medium to the equilibrium temperature, which plays a role in dynamic regulation; the present invention eliminates heat recovery loss, makes full use of waste heat sources, solves the problem of unstable and unbalanced waste heat, obtains a heat source with constant temperature, establishes a stable supply and demand relationship, and has outstanding energy-saving and consumption-reducing characteristics and significant progress.

[0037] Although the present invention has been described in detail with reference to the aforementioned examples, it is still possible for those skilled in the art to make and modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A waste heat recovery and utilization heat balance system, characterized in that The heat carried by the flue gas is collected by connecting to the main flue of the boiler (2) through the flue gas heat exchanger (1), the heat carried by the slag is collected by connecting to the bottom of the boiler (2) through the tube-fin heat exchanger (3), and the heat carried by the cooling medium is collected by connecting to the cooling water outlet of the boiler (2) through the shell-and-tube heat exchanger (4). The inlet and outlet liquid heat dissipation sections of the flue gas heat exchanger (1), the tube-and-fin heat exchanger (3), and the shell-and-tube heat exchanger (4) mix the three grades of heat through the primary heat exchange box (5). The outlet liquid of the primary heat exchange box (5) enters the secondary heat exchange box (6), and the outlet liquid of the secondary heat exchange box (6) enters the primary heat exchange box (5) again, forming a closed-loop heat flow. The secondary heat exchange box (6) transports the heat to the greenhouse (8) through the heating pipeline (7); the heat dissipation section is made into a snake shape; the primary heat exchange box (5) is a rectangular cavity structure, and the inner and outer shells are made of stainless steel; the secondary heat exchange box (6) is a rectangular cavity structure, and the inner and outer shells are made of stainless steel; the heat exchange pipelines of the flue gas heat exchanger (1), the tube-fin heat exchanger (3), and the shell-and-tube heat exchanger (4) are closed loops, a circulating pump (9) is arranged on the heat exchange pipelines, and the heat exchange medium used in the heat exchange pipelines is heat transfer oil; the lower part of the primary heat exchange box (5) is equipped with a delivery pipe (10) injected into the upper part of the secondary heat exchange box (6), and a water pump (11) is installed on the delivery pipe (10); the lower part of the secondary heat exchange box (6) is equipped with a delivery pipe (10) injected into the upper part of the primary heat exchange box (5), and a water pump (11) is installed on the delivery pipe (10) 11), and the heat exchange medium used by the delivery pipe (10) is water; the secondary heat exchange box (6) is equipped with a water supply tank (14), and soft water is stored in the water supply tank (14), and an electric two-way valve (15) is installed on the water supply pipeline of the water supply tank (14); the secondary heat exchange box (6) is equipped with a hot water tank (16), and the water inlet of the hot water tank (16) comes from the hot water output by the boiler (2), and an electric two-way valve (15) is installed on the water supply pipeline of the hot water tank (16). Hot water is injected into the secondary heat exchange box (6) through the hot water tank (16), which plays a dynamic adjustment role, further ensures the balance of heat, and simultaneously supplements the consumption of the heat exchange medium in the heat exchange process; the water supply tank (14) is a rectangular cavity structure, and through the water supply tank (16), the water supply of the hot water tank (16) is supplied by the hot water tank (16). The box (14) injects soft water into the secondary heat exchange box (6) to reduce the temperature of the heat exchange medium; the hot water tank (16) is a rectangular cavity structure, and hot water is injected into the secondary heat exchange box (6) through the hot water tank (16) to increase the temperature of the heat exchange medium, thereby playing a role in dynamic regulation; the pipe network of the heating pipeline (7) is a closed loop, and a heating pump room (13) is installed on the heating pipeline (7). The heating pipeline (7) and the heat exchange medium water in the secondary heat exchange box (6) are exchanged again, and the greenhouse (8) planted near the thermal power plant is centrally heated through the heating pipeline (7). The constant temperature is conducive to the growth of vegetable crops with strict temperature requirements, ensuring agricultural production, effectively utilizing energy, and reducing heat loss caused by long-distance transportation;A condenser (12) is installed on the upper part of the secondary heat exchange box (6). The condenser (12) can condense the steam generated by the heat exchange medium after the heat balance is achieved and return it to the secondary heat exchange box (6), thereby reducing the consumption of the heat exchange medium. A heat meter (17) is installed on the secondary heat exchange box (6). The heat meter (17) can monitor the change of water temperature in real time, thereby ensuring a stable and balanced heating operation. When the heat flow passes through the primary heat exchange box (5), the heat exchange medium water inside it fuses all the heat and reorganizes it. Then, it is transported by the secondary heat exchange box (6) in cooperation with the water pump (11) under pressure, so that the fused heat exchange medium water forms a circulation, and all the heat is recombined. The heat exchange medium in the secondary heat exchange box (6) is then exchanged with the heat exchange medium water in the secondary heat exchange box (6) through the heating pipeline (7) to provide centralized heating to the greenhouse (8) planted near the thermal power plant; when the temperature of the heat exchange medium in the secondary heat exchange box (6) exceeds the equilibrium temperature, the electric two-way valve (15) is opened to inject soft water into the secondary heat exchange box (6) through the water supply tank (14) to reduce the temperature of the heat exchange medium to the equilibrium temperature; when the temperature of the heat exchange medium in the secondary heat exchange box (6) is lower than the equilibrium temperature, the electric two-way valve (15) is opened to inject hot water into the secondary heat exchange box (6) through the hot water tank (16) to increase the temperature of the heat exchange medium to the equilibrium temperature, thereby playing a role of dynamic regulation. ;

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