A flexible adjustable waste heat boiler tail end waste heat utilization hot water system and method

Abstract

The application discloses a flexible adjustable waste heat utilization hot water system and method for tail of waste heat boiler, which is suitable for the waste heat boiler configured by a gas-steam combined cycle unit, designs a combined application process route of the waste heat utilization hot water system for the tail of the waste heat boiler and a bromine cooling machine energy supply, utilizes existing condensate water, a condensate water heater and a boiler water supply system, circulates working medium through a hot water circulating pump, and realizes energy supply of the bromine cooling machine; the control mode in the system shutdown, startup and regulation stages is introduced, the working medium flow is regulated by frequency conversion and distribution regulation, the working medium temperature is regulated by low-temperature, medium-temperature and high-temperature three-stage temperature regulation, and the energy supply process of the waste heat utilization hot water system for the tail of the waste heat boiler can be flexibly adjusted.

Description

Technical Field

[0001] This invention relates to a flexible and adjustable waste heat boiler tail-end waste heat utilization hot water system and method, belonging to the field of waste heat boiler technology in the thermal power generation industry. Background Technology

[0002] Distributed energy systems are one of the main types of energy supply and peak shaving in my country. These systems generally use natural gas as fuel and are equipped with gas-fired steam combined cycle units, which mainly include important main equipment such as gas turbines, steam turbines, and waste heat boilers. Some units can achieve combined heat and power (CHP) to meet the diverse energy needs of users through cascaded energy utilization.

[0003] Existing technologies for utilizing waste heat from the tail end of waste heat boilers in combined cycle gas turbine units include expanding the final economizer to further recover waste heat, but these technologies cannot achieve flexible and adjustable waste heat recovery. Another approach involves adding hot water heaters, which increases the difficulty of project design and construction, as well as investment costs. Some process routes also cannot fully utilize the waste heat from the tail end of the boiler, resulting in a certain amount of waste heat being wasted during the operation of waste heat boilers.

[0004] When distributed energy systems provide cooling, they are generally equipped with electric chillers or bromine chillers. Electric chillers consume electricity and have low energy utilization efficiency. Bromine chillers require a heat source to drive them, which can be in various forms such as flue gas, hot water, or steam. For hot water-type bromine chillers, the hot water source is usually conventional hot water, such as closed-loop circulating water or heating network circulating water, which often has insufficient temperature or cannot achieve the purpose of waste heat utilization. Combining the waste heat from the tail end of a waste heat boiler with the heat source driving a bromine chiller is a new form of waste heat utilization from the tail end of a waste heat boiler. Currently, there is no technology that can meet the high-efficiency combined application of waste heat utilization from the tail end of a waste heat boiler and a bromine chiller. Summary of the Invention

[0005] The purpose of this invention is to overcome the aforementioned shortcomings in the existing technology and provide a flexible and adjustable waste heat boiler tail-end waste heat utilization hot water system and method. This invention is applicable to waste heat boilers configured in gas-fired steam combined cycle units. It designs a process route for the combined application of a waste heat boiler tail-end waste heat utilization hot water system and a bromine chiller for energy supply. Utilizing existing condensate, condensate heaters, and boiler water supply systems, the working fluid is circulated via a hot water circulation pump to achieve bromine chiller energy supply. The invention introduces control methods for system shutdown, startup, and regulation stages. The working fluid flow rate adopts frequency conversion and distribution regulation, and the working fluid temperature adopts three-stage temperature regulation (low temperature, medium temperature, and high temperature), enabling flexible and adjustable energy supply process for the waste heat boiler tail-end waste heat utilization hot water system.

[0006] The technical solution adopted by this invention to solve the above problems is: a flexible and adjustable waste heat boiler tail-end waste heat utilization hot water system, characterized in that it includes a hot water circulation pump A, a hot water circulation pump B, a bromine chiller, and a condensate heater. The hot water circulation pump A is sequentially connected to an A regulating electric valve and an A circulating water manual valve. The hot water circulation pump B is sequentially connected to a B regulating electric valve and a B circulating water manual valve. The two pipelines are connected in parallel, with the outlet end connected to the circulating water outlet main pipeline and the inlet end connected to the bromine chiller return water pipeline. The circulating water outlet main pipeline and the condensate inlet pipeline are connected in parallel and then connected to the condensate and circulating water main pipeline. The condensate and circulating water main pipeline is equipped with a condensate and circulating water main pipeline manual valve. The circulating water main pipe is connected to the condensate heater inlet pipe and the low-temperature regulating pipe, respectively. A low-temperature regulating electric regulating valve and a low-temperature regulating manual valve are installed sequentially on the low-temperature regulating pipe. The condensate heater inlet pipe is connected to the condensate heater, and the condensate heater is connected to the condensate heater outlet pipe. The condensate heater outlet pipe is connected to the waste heat boiler low-pressure steam drum water supply main pipe and the high-temperature regulating pipe, respectively. A high-temperature regulating manual valve and a high-temperature regulating electric regulating valve are installed sequentially on the high-temperature regulating pipe. The condensate heater is connected to the condensate heater intermediate return water pipe, and an intermediate return water manual valve and an intermediate return water electric regulating valve are installed sequentially on the intermediate return water pipe.

[0007] Furthermore, the condensate heater is the final stage heating surface of the waste heat boiler. One end of the condensate heater inlet pipe is the low-temperature inlet end, which is arranged near the waste heat boiler chimney side, and the other end of the condensate heater outlet pipe is the high-temperature outlet end.

[0008] Furthermore, the condensate heater's intermediate return water pipe, high-temperature regulating pipe, and low-temperature regulating pipe are connected in parallel to the bromine chiller's water supply pipe. The bromine chiller's water supply pipe is connected to the bromine chiller's water supply distribution electric regulating valve and the bromine chiller. The bromine chiller is connected to the bromine chiller's return water pipe, and the pipe containing the bromine chiller's water supply distribution electric regulating valve is connected to the bromine chiller's return water pipe. The bromine chiller's water supply pipe is connected to the drain water manual valve and the drain water electric regulating valve through a branch pipe, and the connection point of this branch pipe is located at the lowest elevation point of the bromine chiller's water supply pipe.

[0009] When the waste heat boiler is in normal operation and the tail-end waste heat utilization hot water system is in shutdown phase, open the manual valves of the condensate and circulating water headers to ensure that the condensate enters the condensate heater normally. The bromine chiller, A hot water circulating pump and B hot water circulating pump are in shutdown state. The low temperature regulating electric regulating valve, low temperature regulating manual valve, A circulating water manual valve, A regulating electric regulating valve, B regulating electric regulating valve, B circulating water manual valve, drain water manual valve, drain water electric regulating valve, high temperature regulating electric regulating valve, high temperature regulating manual valve, intermediate end return water manual valve and intermediate end return water electric regulating valve are in the closed state.

[0010] When the waste heat boiler is in normal operation and the tail-end waste heat utilization hot water system is in the start-up stage: Method 1: First, open the manual drain water valve and the electric drain water regulating valve. After 180 seconds, close the electric drain water regulating valve. Open the electric regulating valve for the bromine chiller water supply distribution. Start the A hot water circulation pump. Open the A circulation water manual valve, the A regulating electric regulating valve, the low-temperature regulating electric regulating valve, and the low-temperature regulating manual valve. After the water circulation is established, open the intermediate end return water manual valve and the intermediate end return water electric regulating valve. At the same time, gradually close the opening of the low-temperature regulating electric regulating valve. After the temperature reaches the target start-up temperature of the bromine chiller, start the bromine chiller. Then, slowly close the bromine chiller water supply distribution electric regulating valve to establish water circulation for the bromine chiller, the A hot water circulation pump, and their pipelines to meet the normal operation of the bromine chiller. Method 2: Start the B hot water circulation pump. Simultaneously open the B regulating electric regulating valve and the B circulation water manual valve. Other operating procedures are the same as in Method 1.

[0011] When the waste heat boiler is in normal operation, the tail-end waste heat utilization hot water system can simultaneously meet the requirements of heat supply medium flow rate and temperature regulation during the adjustment phase. The medium flow rate can be regulated by frequency conversion adjustment of the A hot water circulation pump or the B hot water circulation pump to adjust the inlet water flow to the bromine chiller, or by adjusting the opening of the electric regulating valve for the bromine chiller water supply distribution. The medium temperature can be flexibly adjusted by the low-temperature regulating electric regulating valve, the high-temperature regulating electric regulating valve, and the intermediate end return water electric regulating valve.

[0012] For the working fluid flow rate regulation method, when it is necessary to increase the working fluid flow rate, the frequency of the inverter configured for hot water circulation pump A or hot water circulation pump B should be increased; when it is necessary to decrease the working fluid flow rate, the frequency of the inverter configured for hot water circulation pump A or hot water circulation pump B should be decreased, or the opening degree of the electric regulating valve for the bromine chiller water supply distribution should be increased.

[0013] Regarding the working fluid temperature regulation method, when it is necessary to increase the working fluid temperature, the opening of the intermediate end return water electric regulating valve should be gradually increased, and the opening of the low temperature regulating electric regulating valve should be decreased to meet the working fluid energy supply temperature requirement. When the low temperature regulating electric regulating valve is fully closed and the intermediate end return water electric regulating valve is fully open, the temperature requirement still cannot be met. The high temperature regulating manual valve should be opened, the opening of the high temperature regulating electric regulating valve should be gradually increased, and the opening of the intermediate end return water electric regulating valve should be decreased to meet the higher working fluid energy supply temperature requirement.

[0014] Compared with the prior art, the present invention has the following advantages and effects: 1. For gas-fired combined cycle turbine units equipped with waste heat boilers, it is beneficial to improve the economic efficiency of unit operation; 2. Design a process route for the combined application of waste heat utilization hot water system at the tail end of waste heat boiler and bromine chiller energy supply, making full use of existing condensate, condensate heater and boiler water supply system, without increasing the boiler heating surface, with low equipment cost and high process reliability. 3. The working fluid flow rate adopts frequency conversion regulation and distribution regulation, and the working fluid temperature adopts three-level temperature regulation of low temperature, medium temperature and high temperature, which can realize infinitely adjustable working fluid enthalpy value with a margin, fully meeting the energy supply demand. 4. The system startup process can effectively control the temperature to achieve the target startup temperature of the bromine chiller without exceeding the limit, thus ensuring the safe and stable operation of the system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the system of the present invention.

[0016] In the diagram: 1. Condensate inlet pipe; 2. Manual valve for condensate and circulating water main pipe; 3. Condensate heater inlet pipe; 4. Low-temperature regulating electric regulating valve; 5. Low-temperature regulating pipe; 6. Low-temperature regulating manual valve; 7. Circulating water outlet main pipe; 8. Manual valve for circulating water A; 9. Electric regulating valve for regulating A; 10. Hot water circulating pump A; 11. Hot water circulating pump B; 12. Electric regulating valve for regulating B; 13. Manual valve for circulating water B; 14. Bromine chiller return water pipe; 15. Bromine... 16. Chiller, bromine chiller water supply pipe, 17. Drainage water manual valve, 18. Drainage water electric regulating valve, 19. High temperature regulating electric regulating valve, 20. High temperature regulating pipe, 21. High temperature regulating manual valve, 22. Condensate heater intermediate end return water pipe, 23. Intermediate end return water manual valve, 24. Intermediate end return water electric regulating valve, 25. Condensate heater, 26. Condensate heater outlet water pipe, 27. Waste heat boiler low pressure steam drum water supply header, 28. Bromine chiller water supply distribution electric regulating valve. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0018] Example.

[0019] In this embodiment, a distributed energy station in an eco-industrial park is equipped with a 2×59MW gas-fired steam combined cycle cogeneration and power (CHP) unit. Each CHP unit consists of one gas turbine, one steam turbine, two generators, a waste heat boiler, and related equipment. During operation, the gas turbine serves as the prime mover, using natural gas as fuel. The gas turbine's exhaust gas enters the waste heat boiler to exchange heat with the heat exchanger tubes, heating the boiler feedwater to generate superheated steam. This steam then enters the steam turbine to perform work, driving the generator to produce electricity.

[0020] The waste heat boiler is equipped with a flexible and adjustable waste heat utilization hot water system at the boiler's tail end. It employs a combined application process of the waste heat utilization hot water system and a bromine chiller for energy supply, enabling flexible adjustment of the energy supply process. The system consists of: 1. Condensate inlet pipe; 2. Manual valve for condensate and circulating water header; 3. Condensate and circulating water header; 4. Condensate heater inlet pipe; 5. Low-temperature regulating electric regulating valve; 6. Low-temperature regulating pipe; 7. Low-temperature regulating manual valve; 8. Circulating water outlet header; 9. A circulating water manual valve; 10. A regulating electric regulating valve; 11. A hot water circulating pump; 12. B hot water circulating pump; 13. B regulating electric regulating valve; 14. B circulating water manual valve; and 15. Bromine chiller return water pipe. 16. Bromine chiller; 17. Bromine chiller water supply pipe; 18. Drainage water manual valve; 19. Drainage water electric regulating valve; 20. High temperature regulating electric regulating valve; 21. High temperature regulating pipe; 22. High temperature regulating manual valve; 23. Condensate heater intermediate end return water pipe; 24. Intermediate end return water manual valve; 25. Intermediate end return water electric regulating valve; 26. Condensate heater; 27. Condensate heater outlet water pipe; 28. Waste heat boiler low pressure steam drum water supply header; 29. ​​Bromine chiller water supply distribution electric regulating valve.

[0021] Hot water circulation pump A 11 is connected in sequence to electric regulating valve A 10 and manual circulating water valve A 9. Hot water circulation pump B 12 is connected in sequence to electric regulating valve B 13 and manual circulating water valve B 14. After the above two pipelines are connected in parallel, the outlet end is connected to the circulating water outlet main pipeline 8, and the inlet end is connected to the bromine chiller return water pipeline 15. The circulating water outlet main pipeline 8 is connected in parallel with the condensate inlet pipeline 1 and then connected to the condensate and circulating water main pipeline 3. The condensate and circulating water main pipeline 3 is equipped with a manual valve 2. The condensate and circulating water main pipeline 3 is connected to the condensate heater inlet pipeline 4 and the low temperature regulating pipeline 6, respectively. The low temperature regulating pipeline 6 is equipped with... There is a low-temperature regulating electric regulating valve 5 and a low-temperature regulating manual valve 7; the condensate heater inlet pipe 4 is connected to the condensate heater 26, and the condensate heater 26 is connected to the condensate heater outlet pipe 27; the condensate heater outlet pipe 27 is connected to the waste heat boiler low-pressure steam drum water supply header 28 and the high-temperature regulating pipe 21 respectively, and the high-temperature regulating pipe 21 is sequentially equipped with a high-temperature regulating manual valve 22 and a high-temperature regulating electric regulating valve 20; the condensate heater 26 is connected to the condensate heater intermediate end return water pipe 23, and the condensate heater intermediate end return water pipe 23 is sequentially equipped with an intermediate end return water manual valve 24 and an intermediate end return water electric regulating valve 25.

[0022] The condensate heater 26 is the final stage heating surface of the waste heat boiler. One end of the condensate heater inlet pipe 4 is the low-temperature inlet end, which is located near the waste heat boiler chimney. The other end of the condensate heater outlet pipe 27 is the high-temperature outlet end.

[0023] The condensate heater intermediate end return water pipe 23, high temperature regulating pipe 21 and low temperature regulating pipe 6 are connected in parallel to the bromine chiller supply water pipe 17. The bromine chiller supply water pipe 17 is connected to the bromine chiller supply water distribution electric regulating valve 29 and the bromine chiller 16 respectively. The bromine chiller 16 is connected to the bromine chiller return water pipe 15. The pipe where the bromine chiller supply water distribution electric regulating valve 29 is located is connected to the bromine chiller return water pipe 15. The bromine chiller supply water pipe 17 is connected to the drain water manual valve 18 and the drain water electric regulating valve 19 through a branch pipe. The connection point of this branch pipe is located at the lowest elevation point of the bromine chiller supply water pipe 17.

[0024] When the waste heat boiler is in normal operation and the tail waste heat utilization hot water system is in shutdown stage, open the manual valve 2 of the condensate and circulating water header to ensure that the condensate enters the condensate heater 26 normally. The bromine chiller 16, A hot water circulating pump 11 and B hot water circulating pump 12 are in shutdown state. The low temperature regulating electric regulating valve 5, the low temperature regulating manual valve 7, the A circulating water manual valve 9, the A regulating electric regulating valve 10, the B regulating electric regulating valve 13, the B circulating water manual valve 14, the drain water manual valve 18, the drain water electric regulating valve 19, the high temperature regulating electric regulating valve 20, the high temperature regulating manual valve 22, the intermediate end return water manual valve 24 and the intermediate end return water electric regulating valve 25 are in the closed state.

[0025] When the waste heat boiler is in normal operation and the tail waste heat utilization hot water system is in the start-up stage, first open the drain water manual valve 18 and the drain water electric regulating valve 19. After 180 seconds, close the drain water electric regulating valve 19, open the bromine chiller water supply distribution electric regulating valve 29, start the A hot water circulation pump 11, and open the A circulation water manual valve 9, the A regulating electric regulating valve 10, the low temperature regulating electric regulating valve 5, and the low temperature regulating manual valve 7. After the water circulation is established, open the intermediate end return water manual valve 24 and the intermediate end return water electric regulating valve 25, and at the same time gradually close the opening of the low temperature regulating electric regulating valve 5. After the temperature reaches the bromine chiller start-up target temperature of 90℃, start the bromine chiller 16, and then slowly close the bromine chiller water supply distribution electric regulating valve 29 to establish the water circulation of the bromine chiller 16, the A hot water circulation pump 11, and their pipelines to meet the normal operation of the bromine chiller 16.

[0026] When the waste heat boiler is in normal operation and the tail-end waste heat utilization hot water system is in the adjustment phase, the bromine chiller supply water temperature is 100℃. Now, it is necessary to adjust the bromine chiller supply water temperature to 125℃ to meet the energy supply demand. Start by gradually increasing the opening of the intermediate end return water electric regulating valve 25 and decreasing the opening of the low temperature regulating electric regulating valve 5. When the low temperature regulating electric regulating valve 5 is fully closed and the intermediate end return water electric regulating valve 25 is fully open, the bromine chiller supply water temperature is adjusted to 120℃. Then, open the high temperature regulating manual valve 22, gradually increase the opening of the high temperature regulating electric regulating valve 20 to 8%, and decrease the opening of the intermediate end return water electric regulating valve 25 to 85%. The bromine chiller supply water temperature reaches the specified value of 125℃, which meets the energy supply temperature requirement of the waste heat boiler tail-end waste heat utilization hot water system.

[0027] Any content not described in detail in this specification is prior art known to those skilled in the art.

[0028] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the scope of protection of the present invention. Any modifications and refinements made by those skilled in the art without departing from the concept and scope of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A method for adjusting a flexible and adjustable waste heat boiler tail-end waste heat utilization hot water system, wherein the flexible and adjustable waste heat boiler tail-end waste heat utilization hot water system includes an A hot water circulation pump (11), a B hot water circulation pump (12), a bromine chiller (16), and a condensate heater (26). The A hot water circulation pump (11) is connected in sequence to an A regulating electric regulating valve (10) and an A circulating water manual valve (9). The B hot water circulation pump (12) is connected in sequence to a B regulating electric regulating valve (13) and a B circulating water manual valve (14). The outlet of the pipe where the A hot water circulation pump (11) is located is connected to the pipe where the B hot water circulation pump (12) is located in parallel. The main water outlet pipe (8) is connected to the return water pipe (15) of the bromine chiller. The main water outlet pipe (8) is connected in parallel with the condensate inlet pipe (1) and then connected to the condensate and circulating water main pipe (3). The condensate and circulating water main pipe (3) is equipped with a manual valve (2). The condensate and circulating water main pipe (3) is connected to the condensate heater inlet pipe (4) and the low temperature regulating pipe (6) respectively. The low temperature regulating pipe (6) is equipped with a low temperature regulating electric regulating valve (5) and a low temperature regulating manual valve (7) in sequence. The condensate heater inlet pipe (4) is connected to the condensate heater (26). The condensate heater (26) is connected to a condensate heater outlet pipe (27); the condensate heater outlet pipe (27) is connected to the waste heat boiler low-pressure steam drum water supply header (28) and the high-temperature regulating pipe (21), and a high-temperature regulating manual valve (22) and a high-temperature regulating electric regulating valve (20) are installed on the high-temperature regulating pipe (21) in sequence; the condensate heater (26) is connected to a condensate heater intermediate end return water pipe (23), and an intermediate end return water manual valve (24) and an intermediate end return water electric regulating valve (25) are installed on the intermediate end of the condensate heater. The return water pipe (23), high temperature regulating pipe (21), and low temperature regulating pipe (6) are connected in parallel and then connected to the bromine chiller water supply pipe (17). The bromine chiller water supply pipe (17) is connected to the bromine chiller water supply distribution electric regulating valve (29) and the bromine chiller (16). The bromine chiller (16) is connected to the bromine chiller return water pipe (15). The pipe where the bromine chiller water supply distribution electric regulating valve (29) is located is connected to the bromine chiller return water pipe (15). The bromine chiller water supply pipe (17) is connected to the drain water manual valve (18) and the drain water electric regulating valve (19) through a branch pipe. The connection point of this branch pipe is located at the lowest elevation point of the bromine chiller water supply pipe (17). Its characteristics are, When the waste heat boiler is in normal operation and the tail waste heat utilization hot water system is in the start-up stage: Method 1: First, open the drain water manual valve (18) and drain water electric regulating valve (19), close the drain water electric regulating valve (19) after 180s, open the bromine chiller water supply distribution electric regulating valve (29), start the A hot water circulation pump (11), open the A circulation water manual valve (9), the A regulating electric regulating valve (10), the low temperature regulating electric regulating valve (5) and the low temperature regulating manual valve (7), and after the water circulation is established, open the intermediate end return water manual valve (24) and the intermediate end return water manual valve (24). The end return water electric regulating valve (25) is opened, and the opening of the low temperature regulating electric regulating valve (5) is gradually reduced. After the temperature reaches the target temperature condition for the start-up of the bromine chiller, the bromine chiller (16) is started. Then the bromine chiller water supply distribution electric regulating valve (29) is slowly closed to establish water circulation of the bromine chiller (16), A hot water circulation pump (11) and its pipeline to meet the normal operation of the bromine chiller (16); Method 2: Start B hot water circulation pump (12), and simultaneously open B regulating electric regulating valve (13) and B circulating water manual valve (14). Other operation procedures are the same as in Method 1; When the waste heat boiler is in normal operation, the tail waste heat utilization hot water system is in the adjustment stage, which can simultaneously meet the adjustment of the heating working fluid flow rate and temperature. The working fluid flow rate is adjusted by frequency conversion adjustment of the A hot water circulation pump (11) or B hot water circulation pump (12) to adjust the inlet water of the bromine chiller, or by adjusting the opening of the electric regulating valve (29) of the bromine chiller water supply distribution. Regarding the working fluid temperature regulation method, when it is necessary to increase the working fluid temperature, gradually increase the opening of the intermediate end return water electric regulating valve (25) and decrease the opening of the low temperature regulating electric regulating valve (5) to meet the working fluid energy supply temperature requirement; when the low temperature regulating electric regulating valve (5) is fully closed and the intermediate end return water electric regulating valve (25) is fully open, it is still impossible to meet the temperature requirement, open the high temperature regulating manual valve (22), gradually increase the opening of the high temperature regulating electric regulating valve (20) and decrease the opening of the intermediate end return water electric regulating valve (25) to meet the higher working fluid energy supply temperature requirement.

2. The adjustment method for the flexible and adjustable waste heat boiler tail-end waste heat utilization hot water system according to claim 1, characterized in that, The condensate heater (26) is the final stage heating surface of the waste heat boiler. One end of the condensate heater inlet pipe (4) is the low-temperature inlet end, which is arranged near the waste heat boiler chimney side. The other end of the condensate heater outlet pipe (27) is the high-temperature outlet end.

3. The adjustment method for the flexible and adjustable waste heat boiler tail-end waste heat utilization hot water system according to claim 1, characterized in that, When the waste heat boiler is in normal operation and the tail waste heat utilization hot water system is in the shutdown stage, open the manual valve (2) of the condensate and circulating water header to ensure that the condensate enters the condensate heater (26) normally. The bromine chiller (16), A hot water circulating pump (11) and B hot water circulating pump (12) are in the shutdown state. The low temperature regulating electric regulating valve (5), the low temperature regulating manual valve (7), the A circulating water manual valve (9), the A regulating electric regulating valve (10), the B regulating electric regulating valve (13), the B circulating water manual valve (14), the drain water manual valve (18), the drain water electric regulating valve (19), the high temperature regulating electric regulating valve (20), the high temperature regulating manual valve (22), the intermediate end return water manual valve (24) and the intermediate end return water electric regulating valve (25) are in the closed state.

4. The adjustment method for the flexible and adjustable waste heat boiler tail-end waste heat utilization hot water system according to claim 1, characterized in that, For the working fluid flow rate regulation method, when it is necessary to increase the working fluid flow rate, increase the frequency of the inverter configured in hot water circulation pump A (11) or hot water circulation pump B (12); when it is necessary to reduce the working fluid flow rate, reduce the frequency of the inverter configured in hot water circulation pump A (11) or hot water circulation pump B (12), or increase the opening degree of the electric regulating valve (29) for the bromine chiller water supply distribution.

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