Method and system for reducing turbidity of circulating water

Abstract

The invention aims to provide a method for reducing the turbidity of circulating water, which solves the problem of excessive impurities in the circulating water, and comprises the following steps: S1, adding a bypass filtering system on an original circulating water return main pipe; s2, heat circulation liquid circulates in the original circulation water return main pipe; s3, at least two water outlet pipes are communicated with a main drainage pipe; s4, when the pressure difference value of the two ends of the filtering layer in one filter is larger than the set range, closing the water outlet valve, adjusting the corresponding three-way water inlet valve, enabling the sewage draining exit of the three-way water inlet valve to be communicated with the interior of the corresponding filter, starting the corresponding booster pump, and enabling the filtered thermal circulation liquid to flow back into the filter with the pressure difference larger than the set value through pressurization; s5, a drain outlet of the three-way water inlet valve is externally connected with a drain pipe; the second filtering mechanism comprises a second three-way water inlet valve, a second filter, a second booster pump and a second water outlet pipe; and a liquid outlet of the second three-way water inlet valve and the second water outlet pipe are respectively communicated with the upper end and the lower end of the second filter.

Description

Technical Field

[0001] The invention relates to the metallurgical industry, and in particular to a method and a system for reducing the turbidity of circulating water. Background Art

[0002] The 12MW waste heat power generation cooling tower system is close to the sintering belt conveyor area. When the circulating water passes through the cooling tower to cool down, it is easy to inhale the surrounding dust, resulting in high turbidity of the circulating water. The maximum turbidity reaches 30NTU, which causes the heat exchange effect of the waste heat power generation heat exchange system to deteriorate, and scale accumulates on the plate fins of the plate heat exchanger and inside the cooling water pipeline of the rotating equipment, causing the heat exchange effect of the plate heat exchanger to deteriorate, affecting the vacuum of the water ring vacuum pump and causing the cooling water pipeline to be blocked, damaging the bearings and the mechanical seals of the water pump. Summary of the invention

[0003] The purpose of the present invention is to provide a method for reducing the turbidity of circulating water, thereby solving the problem of excessive turbidity of circulating water.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: The present invention provides a method for reducing turbidity of circulating water, comprising: S1. Add a bypass filtration system to the original circulating water return main pipe, the bypass filtration system includes at least two three-way water inlet valves, at least two filters, at least two water outlet pipes, a booster pump, a bypass pipe, a main drain pipe and a water outlet valve; S2. When there is hot circulating liquid flowing in the original circulating water return main pipe, the bypass pipe is connected to the original circulating water return main pipe, and the liquid inlet of the water inlet valve is connected to the bypass pipe. The hot circulating liquid enters the filter through the liquid outlet of the three-way water inlet valve for filtration, and the filtered hot circulating liquid flows out through the outlet pipe; S3, at least two water outlet pipes are connected to the main drainage pipe, the water outlet valve is arranged on the main drainage pipe, the booster pump is arranged on the bypass pipe, and the booster pump applies pressure to the bypass pipe; S4. Impurities are continuously accumulated on the filter layer in the filter. When the pressure difference value at both ends of the filter layer in all filters is less than the set range, the filtered hot cycle liquid flows out through the main drain pipe for collection. When the pressure difference value at both ends of the filter layer in one of the filters is greater than the set range, the outlet valve is closed and the corresponding three-way water inlet valve is adjusted so that the three-way water inlet valve discharge port is connected to the inside of the corresponding filter, so that the filtered hot cycle liquid flows back to the filter with a pressure difference greater than the set value. S5. Connect a sewage pipe to the sewage outlet of the three-way water inlet valve to make the filtered hot circulating liquid flush the filter layer in the filter in reverse, so that the impurities on the filter layer in the filter flow with the filtered hot circulating liquid and are discharged through the sewage pipe.

[0005] Optionally, in S1, the water filtering volume of the bypass filtration system is 3-5% of the original circulating return water main volume, and the filtered liquid volume is 190m³ / h-210m³ / h.

[0006] Optionally, in S1, the pressure range of the booster pump is 20-40 Newton.

[0007] Optionally, in S1, according to the change in the temperature of the heat circulation liquid, when the temperature of the heat circulation liquid is higher than the process requirement, the main drain pipe is connected to the cooling device, and when the temperature of the heat circulation liquid reaches the process requirement, the main drain pipe is connected to the cooling device collection area.

[0008] Optionally, in S1, the three-way water inlet valve is a three-way diaphragm valve.

[0009] Optionally, in S4, the filter layer in the filter is made of quartz sand.

[0010] Optionally, in S4, when the pressure difference between both ends of the filter layer in the filter is less than the set range during backwashing, all filters resume normal filtration.

[0011] The present invention also provides a system for reducing the turbidity of circulating water, comprising a first filtering mechanism, a second filtering mechanism, a main drain pipe, a water outlet valve, a bypass pipe and a booster pump, wherein the bypass pipe is connected to the original circulating water return main pipe. The first filtering mechanism comprises a first three-way water inlet valve, a first filter and a first water outlet pipe, the liquid outlet of the first three-way water inlet valve and the first water outlet pipe are respectively connected to the upper and lower ends of the first filter, and the liquid inlet of the first three-way water inlet valve is connected to the bypass pipe; The second filtering mechanism comprises a second three-way water inlet valve, a second filter and a second water outlet pipe, the liquid outlet of the second three-way water inlet valve and the second water outlet pipe are respectively connected to the upper and lower ends of the second filter, and the liquid inlet of the second three-way water inlet valve is connected to the bypass pipe; The first water outlet pipe and the second water outlet pipe are in communication with the main drainage pipe, the water outlet valve is arranged on the main drainage pipe, and the booster pump is arranged on the bypass pipe; The first three-way water inlet valve also has a sewage outlet, which is connected to or isolated from the interior of the first filter. The second three-way water inlet valve has a sewage outlet, which is connected to or isolated from the interior of the second filter.

[0012] Optionally, the sewage outlet of the first three-way water inlet valve is provided with a first sewage pipe, and the sewage outlet of the second three-way water inlet valve is provided with a second sewage pipe.

[0013] Optionally, a first pressure gauge is provided on the first filter, and a second pressure gauge is provided on the second filter.

[0014] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The present invention provides a method for reducing the turbidity of circulating water. As long as the pressure difference at both ends of the filter layer in a filter is greater than a set range, the filter layer in the filter needs to be backwashed, indicating that too many impurities are accumulated on the filter layer in the filter. The corresponding three-way water inlet valve is adjusted so that the sewage outlet of the three-way water inlet valve is connected to the inside of the filter with a pressure difference greater than the set range, and other filters filter normally. At the same time, the water outlet valve is closed, so that the filtered hot circulating liquid cannot flow out from the main drainage pipe, and the filtered hot circulating liquid is pressurized to reflux and backwash the filter layer in the filter, so that the impurities on the filter layer in the filter pass through the three-way water inlet valve upward with the liquid, and finally the sewage is discharged from the sewage outlet of the three-way water inlet valve, thereby solving the problem of excessive turbidity of circulating water. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings: Figure 1 1 is a schematic diagram of a method and system structure for reducing turbidity of circulating water according to an embodiment of the present invention; Figure 2 is an external view of the cooling unit; Figure 3 yes Figure 2 Interior view shown; Figure 4 is an enlarged view of the drift eliminator.

[0016] The reference numerals are described as follows: 1. Cooling tower; 2. Fan; 3. Water collector; 4. S-shaped filler; 5. Air inlet; 6. Air duct; 7. Reinforcement ribs; 8. Water collector; 9. Nozzle; 10. Air regulating plate; 11. Through hole; 12. Gap; 13. Collecting chamber; 14. Return branch pipe; 15. Return pipe; 20. Original circulation return main pipe; 21. Main sewage pipe; 22. Drain valve; 100. First filtering mechanism; 101. First three-way water inlet valve; 102. First filter; 1 03, first branch pipe; 104, first water outlet pipe; 105, first sewage pipe; 106, first pressure gauge; 107, first filter layer; 110, exhaust valve; 120, cleaning pipe; 130, cleaning valve; 200, second filter mechanism; 201, second three-way water inlet valve; 202, second filter; 203, second branch pipe; 204, second water outlet pipe; 205, second sewage pipe; 206, second pressure gauge; 207, second filter layer; 300, main drain pipe; 400, water outlet valve; 401, first local pressure gauge; 402, second local pressure gauge; 301, first drain pipe; 302, second drain pipe; 303, first valve; 304, second valve; 305, thermometer; 306, check valve; 500, bypass pipe; 600, booster pump. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0020] like Figure 1 As shown, a method for reducing turbidity of circulating water for a waste heat power generation system comprises: S1. Add a bypass filtration system to the original circulating water return main pipe. The bypass filtration system includes at least two three-way water inlet valves, at least two filters, at least two water outlet pipes, a booster pump, a bypass pipe, a main drain pipe and a water outlet valve. In this example, multiple water inlet valves, filters and water outlet pipes are provided; In S1, the water filtering volume of the bypass filtration system is 3-5% of the original circulating return water main volume, and the filtered liquid volume is 190m³ / h-210 m³ / h, that is, the flow rate of the hot circulating liquid flowing through at least two three-way water inlet valves is 190m³ / h-210 m³ / h.

[0021] In S1, the booster pump pressure range is 20 N -40 N， The booster pump is used to apply pressure to the inside of the bypass pipe. Backwashing will only be started when the pressure difference between the two ends of the filter layer in one of the filters is greater than the set range. During backwashing, the pressure of the booster pump can be adjusted to increase to increase the penetration of the hot circulating liquid at the inlet into the filter and the backwashing intensity.

[0022] In S1, according to the temperature change of the heat circulation liquid, when the temperature of the heat circulation liquid is higher than the process requirement, the main drain pipe is connected to the cooling device, the heat circulation liquid is cooled in the cooling device, and then collected for use. When the temperature of the heat circulation liquid reaches the process requirement, the main drain pipe is connected to the collection chamber of the cooling device for use.

[0023] In S1, the three-way water inlet valve adopts a three-way diaphragm valve. The structure of the three-way diaphragm valve is relatively simple, which makes it convenient to manufacture and maintain. The diaphragm of the three-way diaphragm valve can tightly close the valve port to ensure good sealing and prevent medium leakage. The three-way diaphragm valve also has the advantages of strong corrosion resistance and a wide flow adjustment range.

[0024] S2. There is hot circulating liquid flowing in the original circulating return water main pipe. The hot circulating liquid flows into the bypass pipe, and the liquid inlet of the water inlet valve is connected to the bypass pipe. The hot circulating liquid enters the filter through the liquid outlet of the three-way water inlet valve for filtration. The three-way water inlet valve connects the bypass pipe and the filter through a pipeline. The three-way water inlet valve also has a sewage outlet which is closed at this time. The filtered hot circulating liquid flows out through the outlet pipe; S3, at least two water outlet pipes are connected to the main drainage pipe, the filtered hot cycle liquid is collected in the main drainage pipe, and the water outlet valve is set on the main drainage pipe; S4. Impurities are constantly accumulated on the filter layer in the filter. When the pressure difference at both ends of the filter layer in all filters is less than the set range, the filtered hot circulating liquid flows out through the main drain pipe for collection. When the pressure difference at both ends of the filter layer in one of the filters is greater than the set range, close the outlet valve, adjust the corresponding three-way water inlet valve, so that the three-way water inlet valve outlet is connected to the inside of the corresponding filter, and the hot circulating liquid filtered by other filters is pressurized and refluxed to the filter with a pressure difference greater than the set value to perform backwashing of the filter, that is, reverse flushing of the filter layer. The backwashing sewage is discharged to the sewage pump station through the sewage valve for collection, and then transported to the sewage treatment plant for treatment and reuse. During the backwashing process of any filter, other filters can still work normally and produce water normally; In S4, the filter layer in the filter is made of quartz sand. Quartz sand filtration can effectively remove suspended matter, colloidal particles and organic matter in the water, making the water clearer and more transparent. At the same time, it can also remove microorganisms and pathogens, thereby purifying the water source and improving the water quality. Quartz sand has high physical stability and corrosion resistance, which can reduce equipment maintenance and replacement costs to a certain extent and increase equipment life. Quartz sand filtration is a physical treatment method that does not require the addition of any chemical agents. It relies entirely on mechanical filtration and has little impact on the environment. It is energy-saving and environmentally friendly. Quartz sand filtration is simple to operate, and only requires regular backwashing of the filter layer.

[0025] In S4, when the pressure difference between the two ends of the filter layer in the filter is less than the set range during backwashing, all filters resume normal filtration. During this process, the outlet valve is opened, and the filtered hot cycle liquid flows out normally, and the corresponding three-way water inlet valve's liquid inlet and liquid outlet are connected.

[0026] S5. Connect a sewage pipe to the sewage outlet of the three-way water inlet valve to make the filtered hot circulating liquid flush the filter layer in the filter in reverse, so that the impurities on the filter layer in the filter flow with the filtered hot circulating liquid and are discharged through the sewage pipe.

[0027] A system for reducing turbidity of circulating water includes a first filtering mechanism 100, a second filtering mechanism 200, a main drain pipe 300, a water outlet valve 400, a bypass pipe 500 and a booster pump 600. The bypass pipe 500 is connected to an original circulating return water main pipe 20, and part of the hot circulating liquid in the original circulating return water main pipe 20 flows into the bypass pipe 500.

[0028] The first filtering mechanism 100 includes a first three-way water inlet valve 101, a first filter 102, and a first water outlet pipe 104. The liquid outlet of the first three-way water inlet valve 101 and the first water outlet pipe 104 are respectively connected to the upper and lower ends of the first filter 102. The liquid inlet of the first three-way water inlet valve 101 is connected to the bypass pipe 500. The hot circulating liquid in the bypass pipe 500 passes through the liquid inlet of the first three-way water inlet valve 101, and the hot circulating liquid then enters the first filter 102 from the liquid outlet of the first three-way water inlet valve 101.

[0029] The second filtering mechanism 200 includes a second three-way water inlet valve 201, a second water outlet pipe 204 of the second filter 202, the liquid outlet of the second three-way water inlet valve 201 and the second water outlet pipe 204 are respectively connected to the upper and lower ends of the second filter 202, the liquid inlet of the second three-way water inlet valve 201 is connected to the bypass pipe 500, the heat circulation liquid in the bypass pipe 500 passes through the liquid inlet of the second three-way water inlet valve 201, and the heat circulation liquid then enters the second filter 202 from the liquid outlet of the second three-way water inlet valve 201.

[0030] The first water outlet pipe 104 and the second water outlet pipe 204 are in communication with the main drainage pipe 300 , the water outlet valve 400 is disposed on the main drainage pipe 300 , and the booster pump 600 is disposed on the bypass pipe 500 .

[0031] A first on-site pressure gauge 401 is provided on the bypass pipe 500, and the first on-site pressure gauge 401 is used to monitor the pressure in the bypass pipe 500. A second on-site pressure gauge 402 is provided on the main drainage pipe 300, and the second pressure gauge 402 is used to monitor the pressure in the main drainage pipe 300. If the pressure value monitored by the first on-site pressure gauge 401 in the bypass pipe 500 is greater than the set range, then the supply amount of the heat circulation liquid in the bypass pipe 500 must be adjusted until the pressure value in the bypass pipe 500 returns to the normal range. If the pressure value monitored by the second pressure gauge 402 in the main drainage pipe 300 is greater than the set range, then the filtration amount of the filtered heat circulation liquid in the main drainage pipe 300 must be adjusted until the pressure value in the main drainage pipe 300 returns to the normal range.

[0032] The sewage outlet of the first three-way water inlet valve 101 is provided with a first sewage pipe 105, the sewage outlet of the second three-way water inlet valve 201 is provided with a second sewage pipe 205, and a sewage valve is provided on the main sewage pipe 21. The main sewage pipe 21 is externally connected to a sewage treatment device to protect the environment, so that the water finally discharged meets the standards.

[0033] The first three-way water inlet valve 101 also has a sewage outlet, and the sewage outlet of the first three-way water inlet valve 101 is connected to the first sewage pipe 105, and the first sewage pipe 105 is connected to the main sewage pipe 21. The sewage valve 22 is arranged on the main sewage pipe 21. The sewage outlet of the first three-way water inlet valve 101 is connected to or blocked from the inside of the first filter 102. The first filter 102 has a first filter layer 107. If the pressure difference between the two ends of the first filter layer 107 is greater than the setting range, then the first three-way water inlet valve 101 is adjusted to make the sewage outlet of the first three-way water inlet valve 101 communicate with the inside of the first filter 102, that is, the sewage outlet of the first three-way water inlet valve 101 is connected to the liquid outlet. At this time, the liquid inlet and liquid outlet of the first three-way water inlet valve 101 are separated, and the water outlet valve 400 is closed at the same time, and the drain valve 22 is opened, and the hot circulating liquid filtered by the second filter 202 flows from the second outlet pipe 204 to the main drain pipe 300, and then the filtered hot circulating liquid flows back from the first outlet pipe 104 to the first filter 102, so that the filtered hot circulating liquid reversely flushes the first filter layer 107, and the impurities on the upper end of the first filter layer 107 flow upward with the filtered hot circulating liquid, and the mixed sewage flows out from the drain port of the first three-way water inlet valve 101 into the first drain pipe 105, and flows out from the main drain pipe 21.

[0034] Until the pressure difference at both ends of the first filter layer 107 is less than the set range, adjust the first three-way water inlet valve 101 again to separate the sewage outlet of the first three-way water inlet valve 101 from the inside of the first filter 102, that is, the sewage outlet of the first three-way water inlet valve 101 is separated from the liquid outlet. At this time, the liquid inlet and liquid outlet of the first three-way water inlet valve 101 are connected, open the water outlet valve 400, close the sewage valve 22, and the first filter 102 filters normally.

[0035] The second three-way water inlet valve 201 has a sewage outlet connected to the second sewage pipe 106, the second sewage pipe 106 is connected to the main sewage pipe 21, the sewage outlet of the second three-way water inlet valve 201 is connected to or blocked from the inside of the second filter 202, and the second filter 202 has a second filter layer 207 inside. If the pressure difference between the two ends of the second filter layer 207 is greater than the setting range, then the second three-way water inlet valve 201 is adjusted to make the sewage outlet of the second three-way water inlet valve 201 communicate with the inside of the second filter 202, that is, the sewage outlet of the second three-way water inlet valve 201 is connected to the liquid outlet. At this time, the liquid inlet of the second three-way water inlet valve 201 is connected to the liquid outlet. The outlet is blocked, and the outlet valve 400 is closed, and the drain valve 22 is opened. The hot circulating liquid filtered by the first filter 102 flows from the first outlet pipe 104 to the main drain pipe 300, and then the filtered hot circulating liquid flows to the second outlet pipe 204, and then flows back to the second filter 202 from the second outlet pipe 204. In this way, the filtered hot circulating liquid reversely flushes the second filter layer 207, and the impurities on the upper part of the second filter layer 207 flow upward with the filtered hot circulating liquid. The mixed sewage flows out from the drain outlet of the second three-way water inlet valve 201 into the second drain pipe 106, and finally flows out from the main drain pipe 21.

[0036] Until the pressure difference between the two ends of the second filter layer 207 is less than the set range, adjust the second three-way water inlet valve 201 again to separate the sewage outlet of the second three-way water inlet valve 201 from the inside of the second filter 202, that is, the sewage outlet of the second three-way water inlet valve 201 is separated from the liquid outlet. At this time, the liquid inlet and liquid outlet of the second three-way water inlet valve 201 are connected, open the water outlet valve 400, close the sewage valve 22, and the second filter 202 filters normally.

[0037] A first pressure gauge 106 is provided on the first filter 102 , and a second pressure gauge 206 is provided on the second filter 202 . The first pressure gauge 106 monitors the pressure at both ends of the first filter layer 107 in real time, and the second pressure gauge 206 monitors the pressure at both ends of the second filter layer 207 in real time.

[0038] This example also includes a PCL controller (not shown in the figure). The PCL controller is connected to the first three-way water inlet valve 101, the first pressure gauge 106 and the sewage valve 22 by signal. The PCL controller is also connected to the second three-way water inlet valve 201, the second pressure gauge 206 and the water outlet valve 400 by signal. When the first pressure gauge 106 detects that the pressure difference between the two ends of the first filter layer 107 is greater than the set range, the first pressure gauge 106 sends a signal to the PCL controller, and the PCL controller sends an instruction to the first three-way water inlet valve 101 to isolate the liquid inlet and liquid outlet of the first three-way water inlet valve 101, and connect the liquid outlet and liquid outlet of the first three-way water inlet valve 101. The PCL controller also sends an instruction to the water outlet valve 400 to close the water outlet valve 400. The water outlet valve 400 is an electric valve. The PCL controller also sends an instruction to the sewage valve 22 to open the sewage valve 22.

[0039] When the first pressure gauge 106 detects that the pressure difference across the first filter layer 107 is less than the set range, the PCL controller sends instructions to the first three-way water inlet valve 101, the water outlet valve 400 and the sewage valve 22 respectively, and the first three-way water inlet valve 101, the water outlet valve 400 and the sewage valve 22 respectively return to their original states.

[0040] If the second pressure gauge 206 detects that the pressure values ​​at both ends of the second filter layer 207 are greater than the set range, the second pressure gauge 206 sends a signal to the PCL controller, and the PCL controller sends an instruction to the second three-way water inlet valve 201 to isolate the liquid inlet and outlet of the second three-way water inlet valve 201, and connect the liquid discharge port and the liquid outlet of the second three-way water inlet valve 201. The PCL controller also sends instructions to the water outlet valve 400 and the sewage valve 22 to close the water outlet valve 400 and open the sewage valve 22.

[0041] When the second pressure gauge 206 detects that the pressure values ​​at both ends of the second filter layer 207 are less than the set range, the PCL controller sends instructions to the second three-way water inlet valve 201, the water outlet valve 400 and the sewage valve 22 respectively, and the second three-way water inlet valve 201, the water outlet valve 400 and the sewage valve 22 are restored to their original states respectively.

[0042] An exhaust valve 110 is provided at the end of the bypass pipe 500. When no heat circulation liquid enters the bypass pipe 500, the bypass pipe 500 is filled with gas. Therefore, when the heat circulation liquid enters the bypass pipe 500, since the gas in the bypass pipe 500 is not discharged, the gas will hinder the flow of the heat circulation liquid. Therefore, the exhaust valve 110 should be opened at this time until all the gas in the bypass pipe 500 is discharged. Then, when liquid flows out of the exhaust valve 110, the exhaust valve 110 is closed.

[0043] The bypass pipe 500 has no liquid outlet. A first branch pipe 103 is connected between the bypass pipe 500 and the first filter mechanism 100, and a second branch pipe 203 is connected between the bypass pipe 21 and the second filter mechanism 200. The bypass pipe 500 can only provide heat circulation liquid to the first filter mechanism 100 through the first branch pipe 103, and the bypass pipe 500 provides heat circulation liquid to the second filter mechanism 200 through the second branch pipe 203. The first three-way water inlet valve 101 is set on the first branch pipe 103, and the second three-way water inlet valve 201 is set on the second water outlet pipe 204.

[0044] A cleaning pipe 120 is provided on the main drainage pipe 300, and a cleaning valve 130 is provided on the cleaning pipe 120. After cleaning inside the system, the cleaning valve 130 is opened, and the cleaned sewage and impurities flow out through the cleaning pipe 120. In the non-cleaning state, the cleaning valve 130 is closed.

[0045] The outlet end of the main drain pipe 300 is externally connected to the first drain pipe 301 and the second drain pipe 302. The first drain pipe 301 is connected to the return branch pipe 14. The outlet end of the second drain pipe 302 directly extends into the collecting chamber 13. The first drain pipe 301 is provided with a first valve 303, and the second drain pipe 302 is provided with a second valve 304. The main drain pipe 300 is also provided with a thermometer 305. The thermometer 305 is used to monitor the liquid temperature in the main drain pipe 300. The first valve 303, the second valve 304 and the thermometer 305 is connected with the PCL controller signal. When the thermometer 305 detects that the temperature of the liquid in the main drain pipe 300 is higher than the set range, the thermometer 305 sends a signal to the PCL controller, and the PCL controller sends an instruction to the first valve 303 to open the first valve 303. At this time, the second valve 304 is closed, and the hot circulating liquid comes out from the first drain pipe 301. Because the first drain pipe 301 is connected with the return branch pipe 14, the hot circulating liquid passes through the return branch pipe 14 and falls on the S-shaped filler 4 to dissipate heat.

[0046] A check valve 306 is also provided on the first drain pipe 301. The circulating liquid with too high a temperature flows in the first drain pipe 301. When the first valve 303 is closed and the second valve 304 is opened, the circulating liquid with too high a temperature in the first drain pipe 301 is prevented from flowing back. The first valve 303 and the second valve 304 are both electric valves.

[0047] If the thermometer 305 detects that the temperature of the liquid in the main drain pipe 300 is lower than the set range, it means that the filtered hot circulating liquid becomes cold circulating liquid, and the cold circulating liquid does not need to be cooled anymore. The thermometer 305 sends a signal to the PCL controller again, and the PCL controller sends instructions to the first valve 303 and the second valve 304, closing the first valve 303 and opening the second valve 304 at the same time. The cold circulating liquid comes out from the second drain pipe 302 and directly enters the collection chamber 13.

[0048] like Figure 2 and Figure 3 and Figure 4 As shown, the cooling device includes a cooling tower 1, a fan 2, an S-shaped filler 4 and an air inlet 5. The upper part of the cooling tower 1 is externally connected to a return water branch pipe 14, and the return water branch pipe 14 is connected to the original circulating return water main pipe 20. The waste heat power generation system provides hot circulating liquid to the upper part of the cooling tower 1 through a pipeline. The bottom of the cooling tower 1 is used for externally connecting to a return water pipe 15. The bottom of the cooling tower 1 is provided with a collecting chamber 13, and the collecting chamber 13 is used to collect cold circulating liquid. The bottom of the cooling tower 1 then provides cold circulating liquid to the waste heat power generation system through a pipeline, and the cold circulating liquid is used for heat dissipation of the waste heat power generation system.

[0049] The fan 2 is arranged at the top of the cooling tower 1, the air intake end of the fan 2 is aimed at the inside of the cooling tower 1, and the air outlet end of the fan 2 is aimed at the outside of the cooling tower 1. The S-shaped filler 4 is arranged in the middle of the cooling tower 1, and the nozzle 9 is arranged on the return branch pipe 14. The nozzle 9 is located above the S-shaped filler 4. The nozzle 9 sprays out atomized hot circulating liquid. A curved through hole 11 is arranged in the S-shaped filler 4, and the through hole 11 runs through the upper and lower ends of the S-shaped filler 4. In this way, the hot circulating liquid sprayed out falls on the S-shaped filler 4. The surface of the S-shaped filler 4 is uneven and has a curved surface. The air inlet 5 is arranged at the lower part of the cooling tower 1, and the normal temperature gas can enter the bottom of the cooling tower 1 through the air inlet 5. The normal temperature gas here is cold air with a temperature lower than that of the hot circulating liquid.

[0050] The S-shaped filler 4 has a plurality of through holes 11. When the fan 2 is turned on and aimed at the inside of the cooling tower 1 to inhale air, the cold air will flow from bottom to top. The cold air passes through the surface of the S-shaped filler 4 and the through holes 11. The heat circulating liquid realizes heat exchange on the surface of the S-shaped filler 4. The heat circulating liquid dissipates heat from the inside of the cooling tower 1 in the form of atomization. After the heat circulating liquid is atomized, it falls on the S-shaped filler 4 and slowly accumulates into liquid again. In this way, the heat circulating liquid flows downward through the surface of the S-shaped filler after cooling, or flows downward through the through holes 11 after cooling. The heat circulating liquid will not completely fill the through holes 11 after cooling, and heat exchange is realized in the through holes 11 with the upward cold air and the downward heat circulating liquid after cooling.

[0051] The curved through hole 11 can increase the heat exchange time between the cooled heat circulating liquid and the cold air, so that the cooled heat circulating liquid can be cooled again more fully.

[0052] The spraying direction of the nozzle 9 points to the S-shaped filler 4. A water collector 3 is arranged above the nozzle 9. After the thermal circulation liquid is atomized, part of it rises with the airflow. The airflow contains enough atomized thermal circulation liquid. When the airflow passes through the water collector 3, part of the liquid in the airflow will stay in the water collector 3. The water collector 3 blocks the water mist from rising, and the accumulated liquid falls down onto the S-shaped filler 4.

[0053] The air inlet 5 is located below the S-shaped filler 4. An air regulating plate 10 is rotatably provided at the air inlet 5. The air regulating plate 10 adjusts its angle with the air inlet direction by rotating. By rotating the air regulating plate 10, the air regulating plate 10 can block or release the gas flow. The air inlet 5 can be blocked or opened at a rotating angle. Rotating the air regulating plate 10 can adjust the gas flow at the air inlet 5 to cooperate with thermal cycle liquid cooling.

[0054] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for reducing turbidity of circulating water for use in a waste heat power generation system, characterized in that: include: S1. Add a bypass filtration system to the original circulating water return main pipe, the bypass filtration system includes at least two three-way water inlet valves, at least two filters, at least two water outlet pipes, a booster pump, a bypass pipe, a main drain pipe and a water outlet valve; S2. When there is hot circulating liquid flowing in the original circulating water return main pipe, the bypass pipe is connected to the original circulating water return main pipe, and the liquid inlet of the water inlet valve is connected to the bypass pipe. The hot circulating liquid enters the filter through the liquid outlet of the three-way water inlet valve for filtration, and the filtered hot circulating liquid flows out through the outlet pipe; S3, at least two water outlet pipes are connected to the main drainage pipe, the water outlet valve is arranged on the main drainage pipe, the booster pump is arranged on the bypass pipe, and the booster pump applies pressure to the bypass pipe; S4. Impurities are continuously accumulated on the filter layer in the filter. When the pressure difference value at both ends of the filter layer in all filters is less than the set range, the filtered hot cycle liquid flows out through the main drain pipe for collection. When the pressure difference value at both ends of the filter layer in one of the filters is greater than the set range, the outlet valve is closed and the corresponding three-way water inlet valve is adjusted so that the three-way water inlet valve discharge port is connected to the inside of the corresponding filter, so that the filtered hot cycle liquid flows back to the filter with a pressure difference greater than the set value. S5. Connect a sewage pipe to the sewage outlet of the three-way water inlet valve to make the filtered hot circulating liquid flush the filter layer in the filter in reverse, so that the impurities on the filter layer in the filter flow with the filtered hot circulating liquid and are discharged through the sewage pipe.

2. The method for reducing turbidity of circulating water according to claim 1, characterized in that: In S1, the water filtering capacity of the bypass filtration system is 3-5% of the original circulating return water main volume, and the filtered liquid volume is 190m³ / h-210m³ / h.

3. The method for reducing turbidity of circulating water according to claim 1, characterized in that: In S1, the booster pump pressure range is 20-40 Newton.

4. The method for reducing turbidity of circulating water according to claim 1, characterized in that: In S1, according to the change of the temperature of the heat circulation liquid, when the temperature of the heat circulation liquid is higher than the process requirement, the main drain pipe is connected to the cooling device, and when the temperature of the heat circulation liquid reaches the process requirement, the main drain pipe is connected to the cooling device collection area.

5. The method for reducing turbidity of circulating water according to claim 1, characterized in that: In S1, the three-way water inlet valve adopts a three-way diaphragm valve.

6. The method for reducing turbidity of circulating water according to claim 1, characterized in that: In S4, the filter layer in the filter is made of quartz sand.

7. The method for reducing turbidity of circulating water according to claim 1, characterized in that: In S4, when the pressure difference between the two ends of the filter layer in the filter is less than the set range during backwashing, all filters resume normal filtration.

8. A system for reducing turbidity of circulating water, comprising a first filtering mechanism (100), a second filtering mechanism (200), a main drainage pipe (300), a water outlet valve (400), a bypass pipe (500) and a booster pump (600), wherein the bypass pipe (500) is connected to the original circulating water return main pipe, and characterized in that: The first filtering mechanism (100) comprises a first three-way water inlet valve (101), a first filter (102) and a first water outlet pipe (104); the liquid outlet of the first three-way water inlet valve (101) and the first water outlet pipe (104) are respectively connected to the upper and lower ends of the first filter (102); and the liquid inlet of the first three-way water inlet valve (101) is connected to the bypass pipe (500); The second filtering mechanism (200) comprises a second three-way water inlet valve (201), a second filter (202) and a second water outlet pipe (204); the liquid outlet of the second three-way water inlet valve (201) and the second water outlet pipe (204) are respectively connected to the upper and lower ends of the second filter (202); and the liquid inlet of the second three-way water inlet valve (201) is connected to the bypass pipe (500); The first water outlet pipe (104) and the second water outlet pipe (204) are in communication with the main drainage pipe (300), the water outlet valve (400) is arranged on the main drainage pipe (300), and the booster pump (600) is arranged on the bypass pipe (500); The first three-way water inlet valve (101) further comprises a sewage outlet, the sewage outlet of the first three-way water inlet valve (101) being in communication with or isolated from the interior of the first filter (102), and the second three-way water inlet valve (201) comprising a sewage outlet, the sewage outlet of the second three-way water inlet valve (201) being in communication with or isolated from the interior of the second filter (202).

9. The system for reducing turbidity of circulating water according to claim 8, characterized in that: The sewage outlet of the first three-way water inlet valve (101) is provided with a first sewage outlet pipe (105), and the sewage outlet of the second three-way water inlet valve (201) is provided with a second sewage outlet pipe (205).

10. The system for reducing turbidity of circulating water according to claim 8, characterized in that: The first filter (102) is provided with a first pressure gauge (106), and the second filter (202) is provided with a second pressure gauge (206).

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