High-temperature heating system for waste heat utilization

Abstract

The utility model relates to a waste heat recovery technical field especially, a kind of high-temperature heating system of waste heat utilization, it includes multiple plate heat exchanger unit, multiple centrifugal heat pump unit and multiple circulating heat exchange unit, multiple circulating heat exchange unit includes first circulating heat exchange unit, second circulating heat exchange unit and third circulating heat exchange unit, first circulating heat exchange unit connects a plate heat exchanger with a centrifugal heat pump in series, simultaneously act on first heating water heat exchange pipeline and medium-temperature water supply heat exchange pipeline;Second circulating heat exchange unit uses two parallel plate heat exchangers, respectively access first, second high-temperature water supply heat exchange pipeline, and be connected with second heating water ring heat exchange pipeline;Third circulating heat exchange unit connects three parallel centrifugal heat pump unit in series on third heating water ring heat exchange pipeline, and is connected with low-temperature water supply heat exchange pipeline in parallel connection jointly.The utility model effectively utilizes waste heat, improves heating efficiency and energy utilization rate.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, and in particular to a high-temperature heating system for utilizing waste heat. Background Technology

[0002] Traditional waste heat recovery systems typically employ single-stage heat exchange, and high-temperature waste heat is simply discharged after heat exchange without being fully cooled and utilized, resulting in a significant waste of thermal energy. Medium- and low-temperature waste heat is difficult for traditional systems to recover effectively due to its low temperature, and is usually discharged directly into the environment, resulting in insufficient energy utilization. Ordinary heat pump systems experience a sharp drop in efficiency at low temperatures and cannot stably extract waste heat.

[0003] Traditional waste heat recovery systems typically use fixed heat exchange paths, which cannot adapt to different temperature requirements. When municipal return water at 30°C is directly heated to 55°C, relying solely on a single-stage heat pump or plate heat exchanger can easily lead to unstable output water temperature due to load changes. Existing systems rarely employ multi-branch collaborative designs, making it difficult to balance the relationship between flow rate and temperature.

[0004] In addition, conventional centrifugal heat pumps have low heating efficiency and poor economic performance at low-temperature heat sources. If only plate heat exchangers are used to treat waste heat below 40°C, the heat exchange area needs to be extremely large due to the small temperature difference between the hot and cold ends, resulting in high equipment costs. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to solve the problems of low single-stage heat exchange efficiency, insufficient utilization rate of low-temperature waste heat, poor heat pump energy efficiency, unstable temperature control, and poor adaptability of single path in the existing technology mentioned above, which lead to serious energy waste and high operating costs, a high-temperature heating system for waste heat utilization is provided.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a high-temperature heating system for waste heat utilization, comprising: Multiple plate heat exchanger units, multiple centrifugal heat pump units, and multiple circulating heat exchange units. The system comprises multiple circulating heat exchange units, including a first circulating heat exchange unit, a second circulating heat exchange unit, and a third circulating heat exchange unit. The first circulating heat exchange unit includes a first heating water heat exchange pipeline and a medium-temperature water supply heat exchange pipeline. A plate heat exchanger unit and a centrifugal heat pump unit are connected in series on the first heating water heat exchange pipeline and the medium-temperature water supply heat exchange pipeline, and the plate heat exchanger unit and the centrifugal heat pump unit are connected in series on the medium-temperature water supply heat exchange pipeline. The second circulating heat exchange unit includes a second heating water loop heat exchange pipeline and a first high-temperature water supply heat exchange pipeline. The system includes a heat exchange pipeline and a second high-temperature water supply heat exchange pipeline. Two plate heat exchanger units are connected in parallel on the second heating water loop heat exchange pipeline, and one plate heat exchanger unit is connected in series on the first high-temperature water supply heat exchange pipeline, while the other plate heat exchanger unit is connected in series on the second high-temperature water supply heat exchange pipeline. The third circulating heat exchange unit includes a third heating water loop heat exchange pipeline and a low-temperature water supply heat exchange pipeline. Three centrifugal heat pump units are connected in series on the third heating water heat exchange pipeline, and the three centrifugal heat pump units are connected in parallel on the low-temperature water supply heat exchange pipeline.

[0007] The first heating water heat exchange pipeline and the medium-temperature supply water heat exchange pipeline are connected in series with a plate heat exchanger unit and a centrifugal heat pump unit. This series connection is also on the medium-temperature supply water heat exchange pipeline. This arrangement allows the heating water and medium-temperature supply water to undergo preliminary heat exchange through the plate heat exchanger unit, and then the centrifugal heat pump unit further increases the temperature or regulates the heat, meeting different medium-temperature heating needs. The second heating water loop heat exchange pipeline has two plate heat exchanger units connected in parallel, and are respectively connected in series with the first high-temperature supply water heat exchange pipeline and the second high-temperature supply water heat exchange pipeline. On the heat exchange pipeline, two parallel plate heat exchanger units can be flexibly adjusted according to different high-temperature water supply demands, while simultaneously providing heat exchange for heating water, achieving coordinated operation of high-temperature heating and general heating. On the third heating water heat exchange pipeline, three centrifugal heat pump units are connected in series, and these three centrifugal heat pumps are connected in parallel to the low-temperature water supply heat exchange pipeline. The three centrifugal heat pump units connected in series can gradually increase the temperature of the heating water, while the parallel connection to the low-temperature water supply heat exchange pipeline allows for the rational distribution of heat according to the needs of low-temperature water supply, achieving low-temperature heating. The overall system, through the combination of different circulating heat exchange units, improves the utilization efficiency of waste heat and meets diverse heating demands.

[0008] According to one embodiment of the present invention, the plurality of plate heat exchanger units include a first plate heat exchanger unit, a second plate heat exchanger unit and a third plate heat exchanger unit, and the plurality of centrifugal heat pump units include a first centrifugal heat pump unit, a second centrifugal heat pump unit, a third centrifugal heat pump unit and a fourth centrifugal heat pump unit.

[0009] The system is clearly divided into three plate heat exchanger units and four centrifugal heat pump units to achieve functional modularization; each unit is precisely matched according to pipeline requirements to improve system maintainability and scalability.

[0010] According to one embodiment of the present invention, a plate heat exchanger unit and a centrifugal heat pump unit on the medium-temperature water supply heat exchange pipeline are respectively the first plate heat exchanger unit and the first centrifugal heat pump unit.

[0011] This configuration makes the specific structure of the medium-temperature water supply heat exchange pipeline clearer, facilitating precise control and management of the heat exchange process during system operation, and ensuring the quality and stability of medium-temperature heating.

[0012] According to one embodiment of the present invention, a plate heat exchanger unit on the first high-temperature water supply heat exchange pipeline is a second plate heat exchanger unit.

[0013] This configuration helps to rationally configure and adjust the parameters of the second plate heat exchanger unit in response to the heat exchange needs of the first high-temperature water supply during system design and operation, thereby achieving efficient high-temperature water supply heat exchange.

[0014] According to one embodiment of the present invention, a plate heat exchanger unit on the second high-temperature water supply heat exchange pipeline is a third plate heat exchanger unit.

[0015] During system operation, the third plate heat exchanger unit can be operated and optimized in a targeted manner according to the specific requirements of the second high-temperature water supply, so as to ensure the stability and efficiency of the second high-temperature heating.

[0016] According to one embodiment of the present invention, the three centrifugal heat pump units connected in parallel on the low-temperature water supply heat exchange pipeline are a second centrifugal heat pump unit, a third centrifugal heat pump unit, and a fourth centrifugal heat pump unit.

[0017] Parallel configuration allows the low-temperature water supply heat exchange pipeline to flexibly adjust the number and operating conditions of centrifugal heat pump units according to actual load requirements, thereby improving the system's energy efficiency and operational flexibility and meeting the heat demand of low-temperature water supply under different conditions.

[0018] According to one embodiment of the present invention, a plate heat exchanger unit and a centrifugal heat pump unit on the first heating water heat exchange pipeline are a first plate heat exchanger unit and a first centrifugal heat pump unit.

[0019] This further strengthens the equipment configuration of the primary heating water heat exchange pipeline, which helps to accurately monitor and regulate the heating water heat exchange process of the pipeline during system operation, ensuring that the heating water temperature meets the requirements.

[0020] According to one embodiment of the present invention, the two plate heat exchanger units connected in parallel on the second heating water ring heat exchange pipeline are a second plate heat exchanger unit and a third plate heat exchanger unit.

[0021] This parallel structure can rationally allocate the workload of the two plate heat exchanger units according to the flow rate and heat demand of the heating water, improve the efficiency and stability of heating water heat exchange, and at the same time provide a foundation for subsequent coordinated operation with high-temperature water supply heat exchange pipelines.

[0022] According to one embodiment of the present invention, the three centrifugal heat pump units connected in series on the third heating water heat exchange pipeline are a second centrifugal heat pump unit, a third centrifugal heat pump unit, and a fourth centrifugal heat pump unit.

[0023] The series design allows the heating water to be heated step-by-step through these three centrifugal heat pump units, meeting the heating water temperature requirements at different stages. Simultaneously, it facilitates precise control and optimization during system operation, improving the heating efficiency of the third heating water heat exchange pipeline.

[0024] The beneficial effects of this utility model are: (1) This system achieves the cascade recovery and deep utilization of waste heat through five independent heat exchange pipelines. The plate heat exchangers of the first and second high-temperature water supply heat exchange pipelines are used for preliminary cooling to avoid waste caused by direct discharge of high-temperature heat sources. The medium-temperature water supply heat exchange pipeline and the low-temperature water supply heat exchange pipeline adopt plate heat exchangers and heat pumps or multiple heat pumps in parallel to ensure efficient recovery of medium and low temperature heat sources. The heating water heat exchange pipeline adopts a three-branch collaborative design to flexibly adapt to different working conditions and maximize the extraction of low-grade heat energy. It reduces heat energy waste and enables the effective recovery of medium and low temperature waste heat that could not be used before, thereby improving the overall energy utilization rate. (2) This system achieves dynamic adjustment through the three-branch design of the heating water heat exchange pipeline. The first heating water heat exchange pipeline is suitable for medium temperature difference requirements, balancing efficiency and heating capacity. The second heating water heat exchange pipeline is given priority when the heat source temperature is high, reducing the heat pump running time and energy consumption. The third heating water heat exchange pipeline is designed for extreme low temperature conditions, and uses multi-stage heat pumps to gradually raise the temperature to ensure a stable 55℃ water supply. It adapts to load changes, avoiding the problem of unstable heating caused by heat source fluctuations in traditional systems. It optimizes the operation strategy, automatically selects the optimal branch according to the real-time temperature, and reduces operating costs. It improves system reliability, and can maintain heating through other branches even when a single branch fails, enhancing anti-interference capabilities.

[0025] (3) This system optimizes the equipment operating range by reasonably matching plate heat exchangers and heat pumps, giving priority to the use of plate heat exchangers to avoid the efficiency of heat pumps decreasing under high temperature conditions; adopts parallel or series connection of multiple heat pumps to improve the efficiency of low temperature waste heat extraction; combines plate heat exchanger preheating and heat pump deep temperature increase to reduce heat pump load and reduce energy consumption; multiple heat pumps work together to avoid a sudden drop in efficiency of a single unit in the low temperature range. (4) Modular design enhances system flexibility and maintainability. Each heat exchanger and heat pump unit is dedicated to a specific temperature zone, avoiding efficiency loss caused by mixed use. When a single unit fails, it can be repaired independently without affecting the overall operation. When a new waste heat source is added, the corresponding pipeline can be flexibly added. It reduces the complexity of operation and maintenance and reduces downtime. It supports system expansion to adapt to the future growth of waste heat recovery demand. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a process flow diagram of the high-temperature heating system for waste heat utilization according to this utility model.

[0028] In the diagram: 1. First plate heat exchanger unit; 2. Second plate heat exchanger unit; 3. Third plate heat exchanger unit; 4. First centrifugal heat pump unit; 5. Second centrifugal heat pump unit; 6. Third centrifugal heat pump unit; 7. Fourth centrifugal heat pump unit; 8. 50 / 35℃ supply water pipe; 9. 50 / 35℃ backup plate heat exchanger; 10. 80 / 40℃ supply water pipe; 11. 80 / 40℃ backup plate heat exchanger; 12. 80 / 35℃ supply water pipe; 13. 80 / 35℃ backup plate heat exchanger; 14. 40 / 32℃ supply water pipe; 15. 40 / 32℃ backup plate heat exchanger; 16. 30℃ municipal heating return water pipe; 17. 55℃ municipal heating supply water pipe. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0030] like Figure 1As shown, a high-temperature heating system utilizing waste heat includes a first plate heat exchanger unit 1, a second plate heat exchanger unit 2, a third plate heat exchanger unit 3, a first centrifugal heat pump unit 4, a second centrifugal heat pump unit 5, a third centrifugal heat pump unit 6, a fourth centrifugal heat pump unit 7, and multiple circulating heat exchange units. The multiple circulating heat exchange units include a first circulating heat exchange unit, a second circulating heat exchange unit, and a third circulating heat exchange unit. The first circulating heat exchange unit includes a first heating water heat exchange pipeline and a medium-temperature supply water heat exchange pipeline. A plate heat exchanger unit and a centrifugal heat pump unit are connected in series on the first heating water heat exchange pipeline. The first heating water loop heat exchange unit is connected in series with a centrifugal heat pump unit on a medium-temperature water supply heat exchange pipeline; the second circulating heat exchange unit includes a second heating water loop heat exchange pipeline, a first high-temperature water supply heat exchange pipeline, and a second high-temperature water supply heat exchange pipeline. Two plate heat exchanger units are connected in parallel on the second heating water loop heat exchange pipeline, and one plate heat exchanger unit is connected in series on the first high-temperature water supply heat exchange pipeline, while the other plate heat exchanger unit is connected in series on the second high-temperature water supply heat exchange pipeline; the third circulating heat exchange unit includes a third heating water loop heat exchange pipeline and a low-temperature water supply heat exchange pipeline. Three centrifugal heat pump units are connected in series on the third heating water heat exchange pipeline, and the three centrifugal heat pump units are connected in parallel on the low-temperature water supply heat exchange pipeline.

[0031] The medium-temperature water supply heat exchange pipeline is connected to the 50 / 35℃ water supply pipe 8 and the 50 / 35℃ protection plate heat exchanger 9 respectively. The medium-temperature water supply heat exchange pipeline is connected to the first plate heat exchanger unit 1 and the first centrifugal heat pump unit 4 in sequence. The 50 / 35℃ water supply pipe 8 outputs water at 50℃, which is cooled to 42℃ by the first plate heat exchanger unit 1. The water at 42℃ is then cooled to 35℃ by the first centrifugal heat pump unit 4 before entering the 50 / 35℃ protection plate heat exchanger 9.

[0032] The 50 / 35℃ water supply pipe 8 refers to a composite piping system with a dual-temperature, dual-supply mode. This pipe has the ability to simultaneously transport or switch between transporting hot water at two different temperatures, for example, transporting 50℃ hot water in winter heating mode and 35℃ hot water in summer cooling mode. The 80 / 40℃ water supply pipe 10, 80 / 35℃ water supply pipe 12, and 40 / 32℃ water supply pipe 14 described below also have the same characteristics.

[0033] The 50 / 35℃ guaranteed plate heat exchanger 9 refers to a plate heat exchanger module with dual temperature protection functions. The 50℃ side serves as the high-temperature heat source input end, receiving 50℃ hot water from the system; the 35℃ side serves as the low-temperature output end, exchanging heat and outputting 35℃ low-temperature hot water. The protection means ensuring that the output temperature is stably maintained at the set value of 35℃, compensating for temperature fluctuations by adjusting the flow rate or using auxiliary heating or cooling. The 80 / 40℃ guaranteed plate heat exchanger 11, 80 / 35℃ guaranteed plate heat exchanger 13, and 40 / 32℃ guaranteed plate heat exchanger 15 described below also have the same function.

[0034] The first high-temperature water supply heat exchange pipeline connects the 80 / 40℃ water supply pipe 10 and the 80 / 40℃ protection plate heat exchanger 11. The first high-temperature water supply heat exchange pipeline is connected to the second plate heat exchanger unit 2. Water at 80℃ output from the 80 / 40℃ water supply pipe 10 is cooled to 42℃ by the second plate heat exchanger unit 2 and then enters the 80 / 40℃ protection plate heat exchanger 11.

[0035] The third high-temperature water supply heat exchange pipeline connects the 80 / 35℃ water supply pipe 12 and the 80 / 35℃ protection plate heat exchanger 13. The third high-temperature water supply heat exchange pipeline is connected to the third plate heat exchanger unit 3. Water at 80℃ output from the 80 / 35℃ water supply pipe 12 is cooled to 42℃ by the third plate heat exchanger unit 3 and then enters the 80 / 35℃ protection plate heat exchanger 13.

[0036] The low-temperature water supply heat exchange pipeline connects the 40 / 32℃ water supply pipe 14 and the 40 / 32℃ protection plate heat exchanger 15. The low-temperature water supply heat exchange pipeline is equipped with a second centrifugal heat pump unit 5, a third centrifugal heat pump unit 6 and a fourth centrifugal heat pump unit 7 connected in parallel. The 40℃ water output from the 40 / 32℃ water supply pipe 14 is cooled to 36℃ by heat exchange through the second centrifugal heat pump unit 5, the third centrifugal heat pump unit 6 and the fourth centrifugal heat pump unit 7 respectively before entering the 40 / 32℃ protection plate heat exchanger 15.

[0037] The first heating water heat exchange pipeline connects the 30℃ municipal heating return water pipe 16 and the 55℃ municipal heating supply water pipe 17. The first heating water heat exchange pipeline connects the first plate heat exchanger unit 1 and the first centrifugal heat pump unit 4. The second heating water heat exchange pipeline has the second plate heat exchanger unit 2 and the third plate heat exchanger unit 3 connected in parallel. The third heating water heat exchange pipeline has the second centrifugal heat pump unit 5, the third centrifugal heat pump unit 6, and the fourth centrifugal heat pump unit 7 connected in series. The 40℃ water output from the 30℃ municipal heating return water pipe 16 flows into the first heating water heat exchange pipeline and passes through the first plate heat exchanger unit 17. Group 1 heats the water to 48°C, then the water is heated to 55°C by the first centrifugal heat pump unit 4. At the same time, 40°C water flows into the second heating water heat exchange pipeline, and is heated to 55°C by the second plate heat exchanger unit 2 and the third plate heat exchanger unit 3. Simultaneously, 40°C water flows into the third heating water heat exchange pipeline, and is heated to 45°C by the second centrifugal heat pump unit 5, then to 58°C by the third centrifugal heat pump unit 6, and then to 55°C by the fourth centrifugal heat pump unit 7. The 55°C water output from the three heating water heat exchange pipelines merges and enters the 55°C municipal heating water supply pipe 17.

[0038] The high-temperature heating system for waste heat utilization in this embodiment constructs a multi-stage waste heat recovery and cascade heating system. Through the synergistic combination of plate heat exchangers and centrifugal heat pumps, it achieves efficient recovery and precise distribution of waste heat in different temperature ranges.

[0039] Dedicated heat exchange pipelines are designed for waste heat of different grades to avoid energy waste; heat is extracted or released step by step through a combination of series / parallel heat exchange equipment to maximize heat exchange efficiency; the multi-branch design allows for flexible flow adjustment according to load demand to ensure system stability.

[0040] The 50℃ waste water in the medium-temperature water supply heat exchange pipeline is cooled in two steps: first, it exchanges heat with the low-temperature fluid through the first plate heat exchanger unit 1, and is reduced to 42℃; then, the heat is further extracted by the first centrifugal heat pump unit 4, and 35℃ cold water is output, realizing the deep utilization of medium-temperature waste heat and reducing the 50℃ water to 35℃, which can be directly supplied for cooling; the heat pump improves the quality of the recovered heat and uses it for other heat-demanding processes, such as auxiliary heating of municipal return water.

[0041] The 80°C high-temperature water in the first high-temperature water supply heat exchange pipeline is directly cooled to 42°C through the second plate heat exchanger unit 2 in a single-stage heat exchange, and then output. This quickly handles the high-temperature waste heat and avoids the waste of high-temperature heat sources. The process is simplified and suitable for heating scenarios with less stringent temperature requirements, such as heating needs of 40°C.

[0042] The second high-temperature water supply heat exchange pipeline is similar to the first high-temperature water supply heat exchange pipeline, but the target temperature is lower, at 35°C. It also relies on a single-stage third plate heat exchanger unit 3 to complete the cooling, providing a stable cold source for terminals that require lower temperatures, such as refrigeration systems, and demonstrating the system's multi-stage distribution capability for the same heat source at 80°C.

[0043] The 40°C low-temperature water in the low-temperature water supply heat exchange pipeline is cooled to 36°C through three centrifugal heat pump units connected in parallel, solving the problem of low-temperature waste heat recovery. The parallel connection of multiple heat pumps reduces the load of a single unit and improves the energy efficiency ratio.

[0044] The municipal return water system consists of three heating water heat exchange pipelines. If any one of these pipelines fails, the remaining pipelines can still maintain heating. The heat pump pipeline eliminates temperature fluctuations through three-stage temperature regulation, for example, adjusting the temperature back to 55℃ after overheating from 58℃. During high loads, the parallel plate heat exchanger pipeline is activated for rapid temperature rise, while during low loads, only the heat pump pipeline operates to save energy.

[0045] The energy released by the 80℃ waste heat cooling is partly used to heat the municipal return water. The heat pump extracts heat from the low-temperature waste heat of 40℃ to supplement the high-temperature water supply of 55℃. The system as a whole realizes energy closed loop and reduces the input of external energy.

[0046] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A high-temperature heating system utilizing waste heat, characterized in that, include: Multiple plate heat exchanger units, multiple centrifugal heat pump units, and multiple circulating heat exchange units. The system comprises multiple circulating heat exchange units, including a first circulating heat exchange unit, a second circulating heat exchange unit, and a third circulating heat exchange unit. The first circulating heat exchange unit includes a first heating water heat exchange pipeline and a medium-temperature supply water heat exchange pipeline. A plate heat exchanger unit and a centrifugal heat pump unit are connected in series on the first heating water heat exchange pipeline, and the plate heat exchanger unit and the centrifugal heat pump unit are connected in series on the medium-temperature supply water heat exchange pipeline. The second circulating heat exchange unit includes a second heating water loop heat exchange pipeline, a first high-temperature supply water heat exchange pipeline, and a third circulating heat exchange unit. The second high-temperature water supply heat exchange pipeline has two plate heat exchanger units connected in parallel on the second heating water loop heat exchange pipeline. One plate heat exchanger unit is connected in series on the first high-temperature water supply heat exchange pipeline, and the other plate heat exchanger unit is connected in series on the second high-temperature water supply heat exchange pipeline. The third circulating heat exchange unit includes a third heating water loop heat exchange pipeline and a low-temperature water supply heat exchange pipeline. Three centrifugal heat pump units are connected in series on the third heating water heat exchange pipeline, and the three centrifugal heat pump units are connected in parallel on the low-temperature water supply heat exchange pipeline.

2. The high-temperature heating system for waste heat utilization according to claim 1, characterized in that: The multiple plate heat exchanger units include a first plate heat exchanger unit (1), a second plate heat exchanger unit (2) and a third plate heat exchanger unit (3), and the multiple centrifugal heat pump units include a first centrifugal heat pump unit (4), a second centrifugal heat pump unit (5), a third centrifugal heat pump unit (6) and a fourth centrifugal heat pump unit (7).

3. The high-temperature heating system for waste heat utilization according to claim 2, characterized in that: The plate heat exchanger unit and the centrifugal heat pump unit on the medium-temperature water supply heat exchange pipeline are respectively the first plate heat exchanger unit (1) and the first centrifugal heat pump unit (4).

4. The high-temperature heating system for waste heat utilization according to claim 2, characterized in that: One of the plate heat exchanger units on the first high-temperature water supply heat exchange pipeline is the second plate heat exchanger unit (2).

5. The high-temperature heating system for waste heat utilization according to claim 2, characterized in that: One of the plate heat exchanger units on the second high-temperature water supply heat exchange pipeline is the third plate heat exchanger unit (3).

6. The high-temperature heating system for waste heat utilization according to claim 2, characterized in that: The three centrifugal heat pump units connected in parallel on the low-temperature water supply heat exchange pipeline are the second centrifugal heat pump unit (5), the third centrifugal heat pump unit (6), and the fourth centrifugal heat pump unit (7).

7. The high-temperature heating system for waste heat utilization according to claim 2, characterized in that: The first heating water heat exchange pipeline has a plate heat exchanger unit and a centrifugal heat pump unit, namely the first plate heat exchanger unit (1) and the first centrifugal heat pump unit (4).

8. The high-temperature heating system for waste heat utilization according to claim 2, characterized in that: The two plate heat exchanger units connected in parallel on the second heating water ring heat exchanger pipeline are the second plate heat exchanger unit (2) and the third plate heat exchanger unit (3).

9. The high-temperature heating system for waste heat utilization according to claim 2, characterized in that: The three centrifugal heat pump units connected in series on the third heating water heat exchange pipeline are the second centrifugal heat pump unit (5), the third centrifugal heat pump unit (6), and the fourth centrifugal heat pump unit (7).

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