A coal-fired power plant waste steam optimized utilization system and operation method

Abstract

The application discloses a coal-fired power plant blowdown steam optimal utilization system and an operation method. The system comprises a blowdown steam collecting device, which is provided with an inlet, and the inlet is connected with a blowdown steam pipeline; an adjusting pipeline is communicated with the inner cavity of the blowdown steam collecting device, and is used for supplying cooling water and adjusting the temperature of water in the blowdown steam collecting device; a drain port is arranged at the bottom of the blowdown steam collecting device, and the drain port is communicated with a drain pipeline, and a water supply device is communicated with the drain pipeline; the system further comprises a control device, a temperature detection device and a pressure detection device, the temperature detection device is arranged in the blowdown steam collecting device, the pressure detection device is arranged on the drain pipeline at the water outlet of the water supply device, and the control device is electrically connected with the temperature detection device and the pressure detection device. The application fully utilizes the energy of the blowdown steam, and can dynamically adjust the parameters of the blowdown steam to form hot water to match different user requirements, so that the application scene of the blowdown steam with a single parameter is wider.

Description

Technical Field

[0001] This invention relates to the field of waste steam utilization in thermal power plants, and in particular discloses an optimized utilization system and operation method for waste steam from coal-fired power plants. Background Technology

[0002] To maintain steam purity, coal-fired power plants typically need to discharge wastewater, such as continuous boiler blowdown, scheduled blowdown, turbine blowdown, and deaerator blowdown. Because steam has high energy quality, directly releasing it into the atmosphere not only results in energy loss but also negatively impacts environmental aesthetics. Traditional wastewater steam utilization methods, lacking parameter adjustment capabilities, have limited application scenarios and are not conducive to optimal utilization. Summary of the Invention

[0003] This invention provides a system and operation method for optimizing the utilization of waste steam from coal-fired power plants. It makes full use of the energy of waste steam and can dynamically adjust the parameters for forming hot water to match different user needs, thereby making the application scenarios of waste steam with single parameters wider and the utilization rate higher.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A system for optimizing the utilization of waste steam from a coal-fired power plant includes a waste steam collection device, wherein the waste steam collection device is provided with a steam inlet and the steam inlet is connected to a waste steam pipeline.

[0006] The aforementioned sewage steam collection device has an inner cavity connected to a regulating pipeline for supplying cooling water and regulating the temperature of the water inside the sewage steam collection device.

[0007] The aforementioned sewage steam collection device is provided with a drain outlet at the bottom, the drain outlet is connected to a drain pipe, and a water supply device is connected to the drain pipe.

[0008] It also includes a control device, a temperature detection device, and a pressure detection device. The temperature detection device is located inside the sewage steam collection device, and the pressure detection device is located on the drainage pipe at the outlet of the water supply device. The control device is electrically connected to the temperature detection device and is used to adjust the supply in the regulating pipe. The control device is also electrically connected to the pressure detection device and is used to control the water pressure at the outlet of the water supply device.

[0009] Preferably, the regulating pipeline includes a first regulating pipeline, which includes a cooling water pipe and a cooling water regulating valve disposed on the cooling water pipe. The cooling water pipe is connected to the inner cavity of the sewage steam collecting device, and the cooling water regulating valve is electrically connected to the control device.

[0010] Preferably, the above-mentioned regulating pipeline further includes a second regulating pipeline, which includes a steam supply pipeline and a steam regulating valve disposed on the steam supply pipeline. The steam supply pipeline is connected to the inner cavity of the above-mentioned sewage steam collecting device, and the steam regulating valve is electrically connected to the above-mentioned control device.

[0011] Preferably, the water supply device includes a water pump and a steam drive sub-device. The steam inlet of the steam drive sub-device is connected to a steam inlet pipe, which is connected to the sewage steam pipe. A steam inlet regulating valve is connected to the steam inlet pipe, and the steam inlet regulating valve is electrically connected to the control device.

[0012] Preferably, the steam outlet of the steam-driven sub-device is connected to an exhaust pipe, and the exhaust pipe is connected to the sewage steam collection device.

[0013] Preferably, the connection point between the exhaust steam pipe and the sewage steam collection device and the connection point between the cooling water pipe and the sewage steam collection device are located on the same side of the sewage steam collection device, and the distance between the two is less than the diameter of the cooling water pipe.

[0014] Preferably, the above-mentioned sewage steam collection device is equipped with a water level measuring device, which is electrically connected to the above-mentioned control device.

[0015] An operation method for an optimized utilization system of waste steam from a coal-fired power plant includes:

[0016] First, cooling water is added to the sewage steam collection device through the above-mentioned regulating pipeline so that the water level in the sewage steam collection device reaches the initial water level.

[0017] Then, the waste steam in the thermal system is introduced into the waste steam collection device through the waste steam pipe and mixed with the cooling water therein. The temperature detection device transmits the detected temperature signal to the control device. The control device controls the regulating pipeline to supplement the waste steam collection device with steam or cooling water. After mixing, the temperature in the waste steam collection device reaches the temperature required by the user collected by the control device.

[0018] Then the control device controls the water supply device to start and supply water to the user. Then, the control device adjusts the water supply device according to the pressure signal transmitted back by the pressure detection device, so that the water pressure at the outlet of the water supply device reaches the water pressure required by the user collected in the control device.

[0019] Preferably, the aforementioned regulating pipeline includes a first regulating pipeline and a second regulating pipeline. The first regulating pipeline includes a cooling water pipeline and a cooling water regulating valve disposed on the cooling water pipeline. The second regulating pipeline includes a steam supply pipeline and a steam regulating valve disposed on the steam supply pipeline. The water supply device includes a water pump and a steam drive sub-device. The steam drive sub-device has a steam inlet regulating valve at its steam inlet. The aforementioned wastewater steam collecting device includes a water level measuring device. The system also includes:

[0020] Before supplying water to the aforementioned sewage steam collection device, the aforementioned cooling water regulating valve is first opened to supply cooling water to the sewage steam collection device. When the water level measuring device detects that the water level has reached the required level, the aforementioned cooling water regulating valve is closed. Then, sewage steam enters the aforementioned sewage steam collection device and mixes with the cooling water. The hot water has an initial temperature. The control device compares the initial temperature of the hot water with the temperature required by the user. Then, based on the comparison result, it controls the opening of the aforementioned cooling water regulating valve or the aforementioned steam regulating valve to supply cooling water or steam to the device, adjusting the hot water in the aforementioned sewage steam collection device to the temperature required by the user.

[0021] During the water supply process of the aforementioned sewage steam collection device, after the user adjusts the required water temperature, the control device compares the real-time hot water temperature with the user's required temperature. Then, based on the comparison result, it controls the opening of the aforementioned cooling water regulating valve or the aforementioned steam regulating valve to supply cooling water or steam to the device, thereby adjusting the hot water in the sewage steam collection device to the user's required temperature. When the user adjusts the required water pressure, the control device compares the real-time water pressure in the pipeline with the user's required pressure. Then, based on the comparison result, it adjusts the opening of the aforementioned steam inlet regulating valve to achieve the user's required water pressure.

[0022] Preferably, when the temperature of the hot water in the aforementioned sewage steam collecting device does not meet the user's required temperature before or during water supply, the adjustment process is as follows:

[0023] When the hot water temperature is higher than the user's required temperature, the control device controls the cooling water regulating valve to open, supplying a certain amount of cooling water for mixing, so that the hot water temperature reaches the user's required temperature; when the hot water temperature is lower than the user's required temperature, the control device controls the steam regulating valve to open, supplying a certain amount of steam for mixing, so that the hot water temperature reaches the user's required temperature.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] A system for optimizing the utilization of waste steam from coal-fired power plants involves collecting waste steam in a waste steam collection device, mixing it with cooling water to form hot water. The system, through the coordination of control devices, temperature detection devices, pressure detection devices, regulating pipelines, and water supply devices, ensures that the hot water temperature and outlet pressure within the waste steam collection device meet the user's requirements for hot water temperature and pressure. This allows the system to adjust the parameters of the hot water formed from the waste steam according to different user needs, transforming single-parameter waste steam into adjustable-parameter hot water to meet diverse user requirements, thus broadening its application scenarios and increasing its utilization rate.

[0026] An operation method for an optimized utilization system of waste steam from coal-fired power plants is disclosed. This system can automatically and dynamically adjust the parameters of the hot water generated by the waste steam and the discharge pressure to meet user needs, resulting in good performance. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall system in an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Wastewater steam collection device; 2. Wastewater steam pipeline; 3. First regulating pipeline; 31. Cooling water pipeline; 32. Cooling water regulating valve; 4. Second regulating pipeline; 41. Steam supply pipeline; 42. Steam regulating valve; 5. Drainage pipeline; 6. Water supply device; 61. Water pump; 62. Steam drive sub-device; 63. Steam inlet pipeline; 64. Steam inlet regulating valve; 7. Control device; 8. Temperature detection device; 9. Pressure detection device; 10. Water level measuring device. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] like Figure 1As shown, this embodiment of the invention provides a system for optimizing the utilization of waste steam from a coal-fired power plant, including a waste steam collection device 1, a waste steam pipeline 2, a regulating pipeline, a drainage pipeline 5, a water supply device 6, a control device 7, a temperature detection device 8, and a pressure detection device 9. The waste steam pipeline 2 is connected to the steam inlet of the waste steam collection device 1. Waste steam enters the waste steam collection device 1 through the waste steam pipeline 2 and is collected for reuse. The waste steam in the waste steam pipeline 2 can come from at least one of a boiler, a steam turbine, and a deaerator. The regulating pipeline is used for water supply... Cooling water is supplied to the wastewater steam collecting device 1 to provide an initial water volume, which is then mixed with wastewater steam to form hot water. The regulating pipe is also used to regulate the temperature of the water inside the wastewater steam collecting device 1, thereby adjusting the hot water temperature to the user's desired temperature. The drain pipe 5 is connected to the drain outlet at the bottom of the wastewater steam collecting device 1, and the water supply device 6 is connected in series with the drain pipe 5 for supplying water and regulating the outlet water pressure. The temperature detection device 8 has its detection end installed inside the wastewater steam collecting device 1 to detect the temperature of the water inside. The temperature detection device 8 can provide temperature sensing... The pressure detection device 9 is installed at the drain pipe 5 at the outlet of the water supply device 6 to detect the water pressure at the outlet of the water supply device 6. The pressure detection device 9 can be a pressure sensor. Correspondingly, a control device 7 is set. The control device 7 can be an external computer or a power plant control system. The control device 7 can use the temperature signal detected by the temperature detection device 8 to control the supply of regulating medium into the sewage steam collecting device 1 to regulate the hot water temperature inside, so that it reaches the temperature required by the user. Moreover, the control device 7 can use the pressure signal detected by the pressure detection device 9 to control the water pressure at the outlet of the water supply device 6 to reach the water pressure required by the user, so as to achieve the hot water parameters required by the user and meet the user's needs. Thus, the sewage steam with a single parameter is transformed into hot water with adjustable parameters, which has a wider range of applications and higher utilization rate. In actual operation, the temperature and pressure values ​​determined by the control device 7 are range values. As long as the adjusted temperature and pressure are within this range, it is acceptable. Moreover, the mixing structure of steam and cooling water in the sewage steam collecting device 1 can adopt the structure of steam and cooling water in the deaerator being combined to form hot water.

[0035] Specifically, the regulating pipeline includes a first regulating pipeline 3 and a second regulating pipeline 4. The first regulating pipeline 3 includes a cooling water pipe 31 and a cooling water regulating valve 32. Specifically, the cooling water pipe 31 can be external tap water. The cooling water regulating valve 32 is connected in series with the cooling water pipe 31 and is electrically connected to the control device 7. It is controlled by the control device 7 based on the temperature signal from the temperature detection device 8. Specifically, when the temperature detected by the temperature sensor is higher than the user's required temperature, the control device 7 controls the cooling water regulating valve 32 to open, injecting cooling water into the wastewater steam collecting device 1. After the hot water temperature inside drops to the user's required temperature, the cooling water regulating valve 32 is closed. Furthermore, during the initial operation of the system, a certain amount of cooling water needs to be injected into the wastewater steam collecting device 1 as initial water to mix with the wastewater steam to form hot water. To ensure that the water level after the injection of cooling water does not excessively exceed or fall below the required initial water level, a water level measuring device 10 is installed in the wastewater steam collecting device 1 to detect the actual water level. The water level is monitored to prevent excessively high water levels from causing blockage at the steam inlet and excessively low water levels from causing the water pump 61 to run dry or erode. Specifically, the water level measuring device 10 can be a water level sensor. The second regulating pipeline 4 includes a steam supply pipeline 41 and a steam regulating valve 42. Specifically, the steam in the steam supply pipeline 41 can come from auxiliary steam from the power plant. The steam regulating valve 42 is connected in series with the steam supply pipeline 41 and is electrically connected to the control device 7. It is controlled by the control device 7 based on the temperature signal from the temperature detection device 8. Specifically, when the temperature detected by the temperature sensor is lower than the user's required temperature, the control device 7 controls the steam regulating valve 42 to open, injecting steam into the sewage steam collecting device 1, raising the temperature of the hot water in it to the user's required temperature, and then closing the steam regulating valve 42. Regardless of whether the temperature of the hot water in the sewage steam collecting device 1 is lower or higher than the user's required temperature, it can be adjusted by controlling the cooling water regulating valve 32 or the steam valve to adjust to the user's desired temperature and meet the user's needs.

[0036] Specifically, the water supply device 6 includes a water pump 61 and a steam drive sub-device 62. The drive rod of the steam drive sub-device is connected to the rotor shaft of the water pump 61 to start the water pump 61. The steam drive sub-device has a steam inlet and a steam outlet. The steam inlet of the steam drive sub-device 62 is connected to a steam inlet pipe 63, which is connected to a sewage steam pipe 2. Sewage steam can enter the steam drive sub-device 62 through the steam inlet pipe 63, thereby driving the water pump 61 to work, which can save some electricity. Moreover, a steam inlet regulating valve 6 is connected to the steam inlet pipe 63. 4. Electrically connected to the control device 7, the water pump 61 is controlled by the control device 7 based on the temperature signal transmitted from the pressure detection device 9. Specifically, when the water pressure at the outlet of the water pump 61 detected by the pressure detection device 9 is lower or higher than the user's required pressure, the controller increases or decreases the opening of the steam inlet regulating valve 64 to make the water pressure at the outlet of the water pump 61 meet the user's requirements. Moreover, the steam outlet of the steam drive sub-device 62 is connected to the exhaust pipe and the sewage steam collection device 1, so that the used steam can be reused in the sewage steam collection device 1.

[0037] This invention also discloses an operation method for an optimized utilization system of waste steam from a coal-fired power plant, as detailed below:

[0038] Before supplying water to the sewage steam collection device 1, first open the cooling water regulating valve 32 to supply cooling water to the sewage steam collection device 1. When the water level measuring device 10 measures that the water level has reached the required level, the water level can be set to one-third of the height of the inner cavity of the sewage steam collection device 1. Then close the cooling water regulating valve 32. Sewage steam enters the sewage steam collection device 1 through the sewage steam pipe 2 and mixes with the cooling water, so that the hot water has an initial temperature.

[0039] Then, the control device 7 compares the initial temperature of the hot water with the temperature required by the user. Based on the comparison result, it controls the opening of the cooling water regulating valve 32 or the steam regulating valve 42 to supply cooling water or steam to adjust the hot water in the sewage steam collecting device 1 to the temperature required by the user. Specifically, when the hot water temperature is higher than the user temperature, the control device 7 controls the cooling water regulating valve 32 to open, supplying a certain amount of cooling water for mixing (the specific amount of cooling water supplied can be calculated according to existing algorithms) to bring the hot water temperature to the temperature required by the user. When the hot water temperature is lower than the user temperature, the control device 7 controls the steam regulating valve 42 to open, supplying a certain amount of steam for mixing (the specific amount of steam supplied can be calculated according to existing algorithms) to bring the hot water temperature to the temperature required by the user.

[0040] Then, the control device 7 controls the steam inlet regulating valve 64 to open, the steam drive sub-device 62 starts, and drives the water pump 61 to work, supplying water to the user. Then, the control device 7 adjusts the opening of the steam inlet regulating valve 64 according to the pressure signal transmitted back by the pressure detection device 9, so that the water pressure at the outlet of the water pump 61 reaches the water pressure required by the user collected in the control device 7. Specifically, if the water pressure at the outlet of the water pump 61 is lower than the water pressure required by the user, the opening of the steam inlet regulating valve 64 is increased, the rotation speed of the shaft in the steam drive sub-device 62 increases, and the water pressure at the outlet of the water pump 61 increases to reach the required water pressure. If the water pressure at the outlet of the water pump 61 is higher than the water pressure required by the user, the opening of the steam inlet regulating valve 64 is decreased, the rotation speed of the shaft in the steam drive sub-device 62 decreases, and the water pressure at the outlet of the water pump 61 decreases to reach the required water pressure.

[0041] During the water supply process of the sewage steam collecting device 1, after the user adjusts the required water temperature, the control device 7 compares the real-time temperature of the hot water in the sewage steam collecting device 1 with the user's required temperature. Then, based on the comparison result, it controls the opening of the cooling water regulating valve 32 or the steam regulating valve 42 to supply cooling water or steam to the device, adjusting the hot water in the sewage steam collecting device 1 to the user's required temperature. The specific adjustment process is the same as the temperature adjustment process before the sewage steam collecting device 1 supplies water, except that it is real-time adjustment to match the user's needs. When the user adjusts the required water pressure, the control device 7 compares the real-time water pressure in the pipeline with the user's required pressure. Then, based on the comparison result, it adjusts the opening of the steam inlet regulating valve 64 and controls the rotation speed of the shaft in the steam drive sub-device 62, so that the water pressure at the outlet of the water pump 61 reaches the user's required water pressure. The specific adjustment process is the same as the water pressure adjustment process before the sewage steam collecting device 1 supplies water.

[0042] If heat users require different hot water pressures and temperatures at different times, as long as these do not exceed the adjustment range of this device, their needs can be met. In reality, because the temperature of the exhaust steam from coal-fired units is generally higher than 300℃, while the temperature of hot water required by hot water users is usually lower than 100℃ and the pressure is lower than 0.3MPa, the dynamic adjustment of this device can basically meet the needs of all hot water users.

[0043] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A system for optimizing the utilization of waste steam from coal-fired power plants, characterized in that, Includes a sewage steam collection device, wherein the sewage steam collection device is provided with a steam inlet and the steam inlet is connected to a sewage steam pipeline; The inner cavity of the sewage steam collection device is connected to a regulating pipe for supplying cooling water and regulating the temperature of the water in the sewage steam collection device; the bottom of the sewage steam collection device is provided with a drain outlet, the drain outlet is connected to a drain pipe, and a water supply device is connected to the drain pipe. It also includes a control device, a temperature detection device, and a pressure detection device. The temperature detection device is located inside the sewage steam collection device, and the pressure detection device is located on the drainage pipe at the outlet of the water supply device. The control device is electrically connected to the temperature detection device and is used to adjust the supply in the regulating pipe. The control device is also electrically connected to the pressure detection device and is used to control the water pressure at the outlet of the water supply device. The water supply device includes a water pump and a steam drive sub-device. The steam inlet of the steam drive sub-device is connected to a steam inlet pipe, and a steam inlet regulating valve is connected to the steam inlet pipe. The steam inlet pipe is connected to the sewage steam pipe, and the steam inlet regulating valve is electrically connected to the control device; The steam outlet of the steam-driven sub-device is connected to a steam exhaust pipe, and the steam exhaust pipe is connected to the sewage steam collection device. The operation method is as follows: Cooling water is added to the sewage steam collection device through the regulating pipeline so that the water level in the sewage steam collection device reaches the initial water level. The waste steam from the thermal system enters the waste steam collection device through the waste steam pipeline and mixes with the cooling water inside. The temperature detection device transmits the detected temperature signal to the control device, which controls the regulating pipeline to supplement steam or cooling water to the waste steam collection device. After mixing, the temperature inside the waste steam collection device reaches the temperature required by the user collected by the control device. Then, the control device starts the water supply device to supply water to the user. Then, based on the pressure signal transmitted back by the pressure detection device, the control device adjusts the water supply device so that the water pressure at the outlet of the water supply device reaches the water pressure required by the user collected in the control device. Specifically, when the user adjusts the required water pressure, the control device compares the real-time water pressure in the pipeline with the pressure required by the user, and then adjusts the opening of the steam inlet regulating valve according to the comparison result to achieve the required water pressure.

2. The optimized utilization system for waste steam from coal-fired power plants according to claim 1, characterized in that, The regulating pipeline includes a first regulating pipeline, which includes a cooling water pipe and a cooling water regulating valve disposed on the cooling water pipe. The cooling water pipe is connected to the inner cavity of the sewage steam collecting device, and the cooling water regulating valve is electrically connected to the control device.

3. The optimized utilization system for waste steam from coal-fired power plants according to claim 2, characterized in that, The regulating pipeline also includes a second regulating pipeline, which includes a steam supply pipeline and a steam regulating valve installed on the steam supply pipeline. The steam supply pipeline is connected to the inner cavity of the sewage steam collecting device, and the steam regulating valve is electrically connected to the control device.

4. The optimized utilization system for waste steam from coal-fired power plants according to claim 1, characterized in that, The sewage steam collection device is equipped with a water level measuring device, which is electrically connected to the control device.

5. The optimized utilization system for waste steam from coal-fired power plants according to claim 1, characterized in that, The regulating pipeline includes a first regulating pipeline and a second regulating pipeline. The first regulating pipeline includes a cooling water pipe and a cooling water regulating valve installed on the cooling water pipe. The second regulating pipeline includes a steam supply pipeline and a steam regulating valve installed on the steam supply pipeline. The water supply device includes a water pump and a steam drive sub-device. The steam drive sub-device has a steam inlet regulating valve installed at its steam inlet. The wastewater steam collecting device includes a water level measuring device. The system also includes: Before the sewage steam collecting device supplies water, the cooling water regulating valve is first opened to supply cooling water to the sewage steam collecting device. When the water level measuring device detects that the water level has reached the required level, the cooling water regulating valve is closed. Then, sewage steam enters the sewage steam collecting device and mixes with the cooling water. The hot water has an initial temperature. The control device compares the initial temperature of the hot water with the temperature required by the user. Based on the comparison result, it controls the opening of the cooling water regulating valve or the steam regulating valve to supply cooling water or steam to the device, adjusting the hot water in the sewage steam collecting device to the temperature required by the user. During the water supply process of the sewage steam collection device, after the user adjusts the required water temperature, the control device compares the real-time hot water temperature with the user's required temperature. Then, based on the comparison result, it controls the opening of the cooling water regulating valve or the steam regulating valve to supply cooling water or steam to the device, thereby adjusting the hot water in the sewage steam collection device to the user's required temperature.

6. The optimized utilization system for waste steam from coal-fired power plants according to claim 5, characterized in that, Before or during water supply from the sewage steam collection device, if the temperature of the hot water in the sewage steam collection device does not meet the user's required temperature, the adjustment process is as follows: When the hot water temperature is higher than the user's desired temperature, the control device controls the cooling water regulating valve to open, supplying a certain amount of cooling water for mixing, so that the hot water temperature reaches the user's desired temperature; when the hot water temperature is lower than the user's desired temperature, the control device controls the steam regulating valve to open, supplying a certain amount of steam for mixing, so that the hot water temperature reaches the user's desired temperature.

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