New energy coupling low-temperature power generation and waste heat utilization industrial steam supply system and method

Abstract

According to the new energy coupling low-temperature power generation and waste heat utilization industrial steam supply system and method, solar energy is used for driving an organic Rankine cycle and an absorption heat pump, the absorption heat pump recycles waste heat of the cold end of the organic Rankine cycle to heat desalted water to a saturated state, an organic cycle power generation and supply boiler produces superheated steam, and the superheated steam is supplied to a power supply system; the circulating working medium of a solar loop is hot water, the investment cost of a heat source is reduced, and a technical route for preparing high-temperature industrial steam through a low-temperature heat source is achieved. A wind driven generator is added to serve as a supplementary power source and is complementary with the solar-driven organic Rankine cycle generating capacity, and the characteristics that wind energy is less in daytime and more at night and solar energy is available in daytime and not available at night are complementary; the influence of intermittency and volatility of wind energy and solar energy is overcome, whole-day stable electric energy supply is achieved, continuous and stable industrial steam parameters and supply quantity are provided, and a clean, low-carbon, flexible and efficient heat supply system is constructed.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy heating, and relates to a new energy coupling low-temperature power generation and waste heat utilization industrial steam supply system and method. Background Art

[0002] With the increasing awareness of sustainable development and environmental protection around the world, it has become a consensus to vigorously develop renewable energy, mainly wind energy and solar energy. As the main force of clean energy, wind energy and solar energy do play a vital role in reducing greenhouse gas emissions and promoting the transformation of energy structure. However, in the actual use process at this stage, both energy sources face a series of challenges and problems, which to a certain extent limit their widespread application and efficient utilization. As an almost endless energy source, solar energy has the advantages of being clean, pollution-free, and widely distributed around the world. However, the acquisition of solar energy is highly dependent on sunshine conditions, which leads to several significant problems. First, solar energy only exists during the day and cannot be directly used at night, which makes the supply of solar energy discontinuous in time. Secondly, the power generation efficiency of solar energy is easily affected by cloud cover, rainy weather and seasonal changes, showing great instability. In areas with dense clouds or continuous rain, the collection efficiency of solar energy will drop significantly, thus affecting the stable operation of the entire energy system. Wind energy is also a clean energy with great potential, with advantages such as wide distribution of resources and low development cost. But wind energy also faces some inherent challenges. On the one hand, wind energy resources show obvious day-night differences within a day, and the wind at night is often stronger than during the day. This time mismatch brings additional difficulties to energy scheduling and storage. On the other hand, the wind speed itself is highly volatile and uncertain, sometimes high and sometimes low. This instability makes the output power of wind power generation difficult to predict and control, which in turn affects the stability and reliability of the power grid. The above factors work together to make the utilization efficiency of new energy low and the power supply unstable. This not only increases the operating cost and maintenance difficulty of the energy system, but also limits the widespread application of distributed new energy systems in production operations.

[0003] The heating industry currently mainly includes two methods: heating and industrial steam supply. The price of industrial steam is high but the parameters are also high. New energy sources often find it difficult to produce high-parameter steam. Meeting the production standards also requires a significant increase in investment costs, resulting in higher heating costs and even cost inversion. It is difficult to achieve project profitability and is the main restrictive factor in the development of new energy industrial steam technology routes. How to overcome the intermittent and unstable effects of wind and solar new energy and apply it to the field of industrial steam heating, reduce heating costs, and achieve flexible and efficient heating is a new development direction for new energy applications. At the same time, clean heating methods can also replace traditional fossil energy heating, reduce pollutant emissions in the production process, and realize a clean, low-carbon, economical and energy-saving industrial chain. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a new energy coupling low-temperature power generation and waste heat utilization industrial steam supply system and method, which solves the intermittent and unstable effects of wind and solar new energy, and applies it to the field of industrial steam heating. Reducing heating costs and realizing flexible and efficient heating is a new development direction for new energy applications. At the same time, clean heating methods can also replace traditional fossil energy heating, reduce pollutant emissions in the production process, and realize a clean, low-carbon, economical and energy-saving industrial chain.

[0005] The present invention is achieved through the following technical solutions: A new energy coupled low-temperature power generation and waste heat utilization industrial steam supply system, comprising: Solar thermal collector loop, organic Rankine cycle power generation loop, industrial steam supply system and absorption heat pump unit; The solar heat collection loop unit comprises a low-temperature heat storage tank, a low-temperature heat collection pump, a trough solar collector, a high-temperature heat storage tank and a high-temperature heat collection pump which are connected in sequence; The organic Rankine cycle power generation loop comprises a first evaporator, a power machine, a first condenser and a compressor connected in sequence, and the compressor is connected to the power machine and the first generator in sequence; The outlet of the high-temperature heat collection pump is respectively connected to the high-temperature water inlet of the first evaporator and the high-temperature side of the absorption heat pump unit, and the low-temperature water outlet of the first evaporator and the low-temperature side of the absorption heat pump unit are connected to the inlet of the low-temperature heat storage tank; the circulating water side of the first condenser is connected to the circulating water side of the absorption heat pump unit.

[0006] Preferably, the absorption heat pump unit comprises a generator, a first expansion valve, a heat exchanger, an absorber, a working fluid pump, a second condenser, a second expansion valve and a second evaporator; The steam side outlet of the generator is connected in sequence to the condensate side of the second condenser, the second expansion valve, the water vapor side of the second evaporator and the water vapor side inlet of the absorber; The concentrated solution outlet of the generator is connected in sequence to the expansion valve, the concentrated solution side of the heat exchanger and the concentrated solution inlet of the absorber; The dilute solution outlet of the absorber is connected to the dilute solution side of the heat exchanger, the working fluid pump and the dilute solution inlet of the generator in sequence; The high-temperature water inlet of the generator is connected to the outlet of the high-temperature heat collection pump; The low-temperature water outlet of the generator is connected to the inlet of the low-temperature heat storage tank.

[0007] Preferably, the circulating water side of the first condenser is connected to the circulating water side of the second evaporator, and a circulating water pump is provided on the outlet pipeline of the circulating water side of the first condenser.

[0008] Preferably, the industrial steam supply system comprises a desalted water supply pipeline, an industrial steam supply pipeline, an electric boiler and a wind turbine; The electric boiler is electrically connected to the wind generator and the first generator respectively; The outlet of the electric boiler is connected to the industrial steam supply pipe, the desalted water outlet of the condenser is connected to the inlet of the electric boiler, the desalted water supply pipeline is connected to the desalted water side inlet of the absorber, and the desalted water side outlet of the absorber is connected to the desalted water inlet of the second condenser. Preferably, the internal circulating working fluid of the solar thermal collection loop is water.

[0009] Preferably, the internal circulating working fluid of the organic Rankine cycle power generation loop is organic matter.

[0010] Preferably, the internal circulating working fluid of the absorption heat pump unit is lithium bromide solution.

[0011] Preferably, the internal circulation of the industrial steam supply system is water and steam.

[0012] Preferably, the compressor, the power machine and the first generator are connected via a coupling.

[0013] A working method of a new energy coupled low-temperature power generation and waste heat utilization industrial steam supply system, comprising: Low-temperature water enters the solar collector to absorb solar energy and heat to high temperature, and then enters the high-temperature heat storage tank. The high-temperature heat pump adjusts the frequency according to the industrial steam demand and power generation in the industrial steam supply system, and controls the high-temperature water to enter the first evaporator of the organic Rankine cycle power generation loop, driving the organic Rankine cycle power generation loop and the absorption heat pump unit to extract waste heat to heat the desalted water. The organic working fluid in the organic Rankine cycle power generation loop is evaporated by the high-temperature water and enters the power machine to drive the generator to generate electricity. The exhaust steam at the outlet of the absorption heat pump unit enters the condenser to condense and release heat to transfer the heat to the circulating water, and then is sent to the absorption heat pump unit as a low-temperature heat source. The absorption heat pump unit obtains the high-temperature heat source through the solar heat collection loop to reheat the desalted water to a saturated state, and then sends it to the industrial steam supply system to be heated and then sent to the industrial steam user.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides an industrial steam supply system and method for coupling new energy with low-temperature power generation and waste heat utilization. A solar thermal collection loop is formed by a trough-type solar collector and a high and low temperature heat storage tank, and a high and low temperature heat collection pump is provided in the middle to provide circulation power. High-temperature water heated by solar energy drives an organic Rankine cycle to generate electricity, and at the same time drives an absorption heat pump to extract waste heat from the cold end of the organic Rankine cycle. The absorption heat pump recovers the waste heat to preliminarily heat the desalted water. The desalted water heated to a saturated state enters an electric boiler and is heated to an overheated state before being supplied to the outside. The wind turbine and the organic Rankine cycle power generation together supply power to the electric boiler and other electrical equipment in the system. The wind and solar complementarity overcomes the intermittent and unstable effects of new energy, and achieves continuous and stable industrial steam parameters and supply. A technical route for clean industrial steam supply is provided, which reduces heating costs and emissions of pollutants such as CO2, NOx, and SOx, meets dual carbon and energy-saving and environmental protection requirements, and constructs a clean, low-carbon, energy-saving and efficient industrial steam supply system and method.

[0015] Furthermore, the present invention combines solar energy and wind energy, and utilizes the complementary characteristics of solar energy being available during the day and wind energy being available at night, to provide a continuous and stable power supply, reduce the impact of the volatility and instability of new energy on the system, and improve the utilization rate of new energy; Furthermore, the present invention utilizes solar energy to drive an organic Rankine cycle to generate electricity, and at the same time utilizes solar energy to drive an absorption heat pump to recover the cold end waste heat of the Rankine cycle for heating desalted water, thereby realizing efficient utilization of solar energy and improving energy conversion efficiency; Furthermore, the present invention equips the solar thermal collection loop with high and low temperature heat storage tanks. When the industrial steam load demand is less than the solar thermal collection amount, the heat is stored in the high temperature heat storage tank. When the industrial steam load is high, the high temperature heat storage tank releases heat to supplement the thermal collection amount gap, thereby solving the problem of mismatch between the peak and valley periods of new energy and the industrial steam load, and improving the utilization efficiency of new energy. Furthermore, the desalted water of the present invention is first heated to a saturated state by an absorption heat pump, and then heated to an overheated state by an electric boiler, thereby reducing the amount of heat absorbed in the electric boiler during the heating process, reducing power consumption, making full use of solar energy and wind energy generation, improving the utilization and conversion efficiency of wind and light, and reducing heating costs; Furthermore, the present invention constructs a technical route for supplying industrial steam with new energy, reduces solar energy collection parameters, reduces the initial investment cost of new energy steam supply equipment, reduces heating costs, and provides continuous and stable steam parameters and flow through wind and solar complementarity, ensuring the stability and flexibility of new energy steam supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the industrial steam supply system that couples new energy with low-temperature power generation and waste heat utilization.

[0017] In the figure: 1-first evaporator; 2-power machine; 3-first condenser; 4-compressor; 5-first generator; 6-low-temperature heat storage tank; 7-low-temperature heat pump; 8-solar collector; 9-high-temperature heat storage tank; 10-high-temperature heat pump; 11-generator; 12-first expansion valve; 13-heat exchanger; 14-absorber; 15-solution pump; 16-second condenser; 17-second expansion valve; 18-second evaporator; 19-circulating water pump; 20-wind generator; 21-electric boiler. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0019] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0020] The present invention provides a new energy coupling low-temperature power generation and waste heat utilization industrial steam supply system and method, which uses solar energy to drive an organic Rankine cycle and an absorption heat pump, wherein the absorption heat pump recovers waste heat from the cold end of the organic Rankine cycle to heat desalted water to a saturated state, and the organic cycle power generation boiler produces superheated steam. The solar energy loop circulating medium is hot water, which reduces the investment cost of the heat source and realizes a technical route of producing high-temperature industrial steam from a low-temperature heat source. A wind turbine is added as a supplementary power source to complement the power generation of the organic Rankine cycle driven by solar energy, and the characteristics of less wind energy during the day and more at night are complemented with the characteristics of solar energy being available during the day and absent at night, thereby overcoming the intermittent and fluctuating effects of wind energy and solar energy, realizing a stable power supply throughout the day, providing continuous and stable industrial steam parameters and supply, and constructing a clean, low-carbon, flexible and efficient heating system.

[0021] The present invention adopts the following technical solution: The system includes Figure 1 As shown, a solar thermal collection loop, an organic Rankine cycle power generation loop, an industrial steam supply system and an absorption heat pump unit; the solar thermal collection loop unit includes a low-temperature heat storage tank 6, a low-temperature heat collection pump 7, a trough solar thermal collector 8, a high-temperature heat storage tank 9 and a high-temperature heat collection pump 10 connected in sequence; the organic Rankine cycle power generation loop includes a first evaporator 1, a power machine 2, a first condenser 3 and a compressor 4 connected in sequence; the outlet of the high-temperature heat collection pump 10 is respectively connected to the high-temperature water inlet of the first evaporator 1 and the high-temperature side of the absorption heat pump unit, and the low-temperature water outlet of the first evaporator 1 and the low-temperature side of the absorption heat pump unit are connected to the inlet of the low-temperature heat storage tank 6; the circulating water side of the first condenser 3 is connected to the absorption heat pump unit. The absorption heat pump unit comprises a generator 11, a first expansion valve 12, a heat exchanger 13, an absorber 14, a working fluid pump 15, a second condenser 16, a second expansion valve 17 and a second evaporator 18; the steam side outlet of the generator 11 is connected to the condensed water side of the second condenser 16, the second expansion valve 17, the water vapor side of the second evaporator 18 and the water vapor side inlet of the absorber 14 in sequence; the concentrated solution outlet of the generator 11 is connected to the expansion valve 12, the concentrated solution side of the heat exchanger 13 and the concentrated solution inlet of the absorber 14 in sequence; the dilute solution outlet of the absorber 14 is connected to the dilute solution side of the heat exchanger 13, the working fluid pump 15 and the dilute solution inlet of the generator 11 in sequence; The high-temperature water inlet of the generator 11 is connected to the outlet of the high-temperature heat pump 10; The low-temperature water outlet of the generator 11 is connected to the inlet of the low-temperature heat storage tank 6. The circulating water side of the first condenser 3 is connected to the circulating water side of the second evaporator 18, and a circulating water pump 19 is provided on the outlet pipeline of the circulating water side of the first condenser 3; wherein the circulating pump 19 provides power for the circulating water, and transfers heat from the condenser 3 to the evaporator 18 as a low-temperature heat source.

[0022] The industrial steam supply system includes a desalted water supply pipeline, an industrial steam supply pipeline, an electric boiler 21 and a wind turbine 20; the electric boiler 21 is electrically connected to the wind turbine 20 and the first generator 5 respectively; the outlet of the electric boiler 21 is connected to the industrial steam supply pipe, the desalted water outlet of the condenser 16 is connected to the inlet of the electric boiler 21, the desalted water supply pipeline is connected to the desalted water side inlet of the absorber 14, and the desalted water side outlet of the absorber 14 is connected to the desalted water inlet of the second condenser 16. The internal circulating medium of the solar heat collection loop is water.

[0023] The internal circulating working fluid of the organic Rankine cycle power generation loop is organic matter.

[0024] The internal circulating working fluid of the absorption heat pump unit is lithium bromide solution.

[0025] The internal circulation of the industrial steam supply system is water and steam.

[0026] The compressor 4, the power machine 2 and the first generator 5 are connected via a coupling.

[0027] A working method of a new energy coupled low-temperature power generation and waste heat utilization industrial steam supply system, comprising: When the system is running, low-temperature water enters the solar thermal collector 8 to absorb solar energy and is heated to high temperature, and then enters the high-temperature heat storage tank 9. The high-temperature heat pump 10 adjusts the frequency according to the industrial steam demand and the power generation of the wind turbine 20, and controls the high-temperature water to enter the first evaporator 1 and the generator 11 respectively, driving the organic Rankine cycle power generation and the absorption heat pump to extract waste heat to heat the desalted water. The low-temperature water at the outlet of the first evaporator 1 and the generator 11 enters the low-temperature heat storage tank 6. The low-temperature heat pump 7 adjusts the frequency according to the solar light intensity to transfer the low-temperature water to the low-temperature heat storage tank 6. Water is sent to the solar collector 8 to be heated; the organic working fluid in the organic Rankine cycle power generation loop is evaporated by high-temperature water in the evaporator 1, and then enters the power machine 2 to drive the first generator 5 to generate electricity, and the outlet exhaust steam enters the condenser 3 to condense and release heat to transfer heat to the circulating water. The condensed organic working fluid is pressurized by the compression pump 4 and then sent back to the first evaporator 1 to complete the cycle; the circulating water pump 19 sends the circulating water that absorbs heat in the first condenser 3 to the second evaporator 18 as a low-temperature heat source for the absorption heat pump; the generator of the absorption heat pump The working fluid in 11 is heated by high-temperature water and separated into a concentrated solution and water vapor. The concentrated solution is depressurized by the first expansion valve 12 and then passes through the heat exchanger 13 to transfer heat to the dilute solution on the other side, and then falls into the absorber 14 to mix with the water vapor from the evaporator 18 to release heat. In the process, the desalted water is heated at the first level. The dilute solution formed after mixing is pumped back to the generator 11 through the solution pump 15. During the period, it absorbs the heat of the concentrated solution on the other side when passing through the heat exchanger 13. The water vapor at the outlet of the generator 11 condenses in the second condenser 16 to release heat to the desalted water. After secondary heating to a saturated state, the formed condensed water is depressurized by the second expansion valve 17 and enters the evaporator 18 to absorb the low-grade waste heat in the circulating water and evaporate, and the formed water vapor enters the absorber 14; the desalted water is secondary heated to a saturated state by the absorber 14 and the second condenser 16, and then enters the electric boiler 21 to be heated to a superheated state and supplied to industrial steam users; the power generated by the wind turbine 20 and the first generator 5 are combined and supplied to the electric boiler 21 and other electrical equipment in the system to supply power to all electrical equipment in the system.

[0028] It should be noted that the terms "first", "second", "high temperature", "low temperature", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0031] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A new energy coupled low-temperature power generation and waste heat utilization industrial steam supply system, characterized in that: include, Solar thermal collection loop, organic Rankine cycle power generation loop, industrial steam supply system and absorption heat pump unit; The solar heat collection loop unit comprises a low-temperature heat storage tank (6), a low-temperature heat collection pump (7), a trough-type solar heat collector (8), a high-temperature heat storage tank (9) and a high-temperature heat collection pump (10) which are connected in sequence; The organic Rankine cycle power generation loop comprises a first evaporator (1), a power machine (2), a first condenser (3) and a compressor (4) which are connected in sequence, and the compressor (4) is connected in sequence to the power machine (2) and the first generator (5); The outlet of the high-temperature heat pump (10) is respectively connected to the high-temperature water inlet of the first evaporator (1) and the high-temperature side of the absorption heat pump unit; the low-temperature water outlet of the first evaporator (1) and the low-temperature side of the absorption heat pump unit are connected to the inlet of the low-temperature heat storage tank (6); and the circulating water side of the first condenser (3) is connected to the circulating water side of the absorption heat pump unit.

2. According to claim 1, a new energy coupled low-temperature power generation and waste heat utilization industrial steam supply system is characterized in that: The absorption heat pump unit comprises a generator (11), a first expansion valve (12), a heat exchanger (13), an absorber (14), a working fluid pump (15), a second condenser (16), a second expansion valve (17) and a second evaporator (18); The steam side outlet of the generator (11) is connected in sequence to the condensate side of the second condenser (16), the second expansion valve (17), the water vapor side of the second evaporator (18), and the water vapor side inlet of the absorber (14); The concentrated solution outlet of the generator (11) is connected in sequence to the expansion valve (12), the concentrated solution side of the heat exchanger (13), and the concentrated solution inlet of the absorber (14); The dilute solution outlet of the absorber (14) is connected in sequence to the dilute solution side of the heat exchanger (13), the working fluid pump (15) and the dilute solution inlet of the generator (11); The high-temperature water inlet of the generator (11) is connected to the outlet of the high-temperature heat collection pump (10); The low-temperature water outlet of the generator (11) is connected to the inlet of the low-temperature heat storage tank (6).

3. According to claim 2, a new energy coupled low-temperature power generation and waste heat utilization industrial steam supply system is characterized in that: The circulating water side of the first condenser (3) is connected to the circulating water side of the second evaporator (18), and a circulating water pump (19) is provided on the outlet pipeline of the circulating water side of the first condenser (3).

4. According to claim 2, a new energy coupled low-temperature power generation and waste heat utilization industrial steam supply system is characterized in that: The industrial steam supply system comprises a desalted water supply pipeline, an industrial steam supply pipeline, an electric boiler (21) and a wind turbine (20); The electric boiler (21) is electrically connected to the wind generator (20) and the first generator (5) respectively; The outlet of the electric boiler (21) is connected to the industrial steam supply pipe, the desalted water outlet of the condenser (16) is connected to the inlet of the electric boiler (21), the desalted water supply pipeline is connected to the desalted water side inlet of the absorber (14), and the desalted water side outlet of the absorber (14) is connected to the desalted water inlet of the second condenser (16).

5. According to claim 1, a new energy coupled low-temperature power generation and waste heat utilization industrial steam supply system is characterized in that: The internal circulating medium of the solar heat collection loop is water.

6. The new energy coupled low-temperature power generation and waste heat utilization industrial steam supply system according to claim 1 is characterized in that: The internal circulating working fluid of the organic Rankine cycle power generation loop is organic matter.

7. The new energy coupled low-temperature power generation and waste heat utilization industrial steam supply system according to claim 1 is characterized in that: The internal circulating working fluid of the absorption heat pump unit is lithium bromide solution.

8. The new energy coupled low-temperature power generation and waste heat utilization industrial steam supply system according to claim 1 is characterized in that: The internal circulation of the industrial steam supply system is water and steam.

9. The new energy coupled low-temperature power generation and waste heat utilization industrial steam supply system according to claim 1 is characterized in that: The compressor (4), the power machine (2) and the first generator (5) are connected via a coupling.

10. A method for operating a new energy coupled low-temperature power generation and waste heat utilization industrial steam supply system as claimed in any one of claims 1 to 9, characterized in that: include, Low-temperature water enters the solar thermal collector (8) to absorb solar energy and be heated to a high temperature, and then enters the high-temperature heat storage tank (9). The high-temperature heat pump (10) adjusts the frequency according to the industrial steam demand and power generation in the industrial steam supply system, and controls the high-temperature water to enter the first evaporator (1) of the organic Rankine cycle power generation loop and the generator (11) of the absorption heat pump unit respectively, and drives the organic Rankine cycle power generation loop and the absorption heat pump unit to extract waste heat and heat the desalted water. The organic working fluid in the organic Rankine cycle power generation loop is evaporated by the high-temperature water and enters the power machine (2) to drive the generator (5) to generate electricity. The outlet exhaust steam enters the condenser (3) to condense and release heat to transfer the heat to the circulating water, and then is sent to the absorption heat pump unit as a low-temperature heat source. The absorption heat pump unit uses the high-temperature heat source obtained from the solar thermal collector loop to reheat the desalted water to a saturated state, and then sends it to the industrial steam supply system to be heated and then sent to the industrial steam user.

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