A cleaning system for use on a demister
Patent Information
- Application Number
- CN202522485526.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-24
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-11-24
AI Technical Summary
在高盐废水蒸发过程中，雾沫夹带现象严重，除沫器需频繁拦截盐分、有机物等黏性物质，长期运行后易结垢堵塞，导致蒸发效率降低、能耗增加
[0010]本实用新型的优点：本实用新型通过蒸发塔内部和蒸发塔的排气口处的压力差值，当差值达到0.02MPa时，控制警报器示警，提示作业人员打开排空阀，将蒸发塔底部浓缩液排空后，关闭排空阀；作业人员再打开第一药剂阀和气动阀，启动循环泵，柠檬酸药箱内的柠檬酸溶液经进液管线进入蒸发塔内部，对除沫器进行清洗；循环泵运行2小时后，定时器将信号传输给控制器，控制器自动控制第一药剂阀关闭、第二药剂阀打开，碳酸钠药箱内的碳酸钠溶液经进液管线进入蒸发塔内部，对除沫器进行冲洗，中和柠檬酸溶液，当pH传感器检测到冲洗液的pH≥6.5时，pH传感器将信号传输给控制器，控制器自动控制第二药剂阀关闭、冲水阀开启，使用4-5Mpa高压冲洗水对除沫器进行冲洗；在整个清洗过程中，压缩空气对结垢进行吹扫冲击；循环泵继续运行5分钟后，定时器将信号传输给控制器，控制器自动控制冲水阀关闭、循环泵停运；作业人员关闭气动阀，打开排空阀，排出清洗废液，完成清洗，操作简单，避免离线拆卸清洗。
Smart Images
Figure CN224911778U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cleaning equipment technology, and in particular to a cleaning system used in a demister. Background Technology
[0002] As important energy and chemical enterprises, coking plants generate high-salinity wastewater during their production processes. If this wastewater is discharged directly without effective treatment, it will not only pollute the soil and water bodies, leading to problems such as soil salinization and eutrophication, but also severely impact the biodiversity of ecosystems and disrupt the ecological balance.
[0003] The salt separation process is used to solve the problem of high-salinity wastewater. The evaporation and concentration equipment is a key component of this process, comprising an evaporation tower 1, a forced circulation pump 21, and a heater 22. The forced circulation pump 21 extracts the high-salinity wastewater from the bottom of the evaporation tower 1, pressurizes it, and delivers it to the tube-side inlet of the heater 22. As the high-salinity wastewater flows within the tube side of the heater 22, it absorbs heat from the shell-side heating medium, raising its temperature to its boiling point, causing some water to evaporate. The gas-liquid mixture enters the evaporation tower 1 from the heater outlet, where it is slowed down by baffles. The steam flows upwards, passes through a demister 13, and then enters the condenser. The unevaporated concentrate collects at the bottom of the evaporation tower and is pumped back to the heater by the forced circulation pump, forming a cycle and achieving evaporation and concentration. During the evaporation of high-salinity wastewater, mist entrainment is severe. The demister needs to frequently intercept viscous substances such as salt and organic matter, which can easily lead to scaling and blockage after long-term operation, resulting in reduced evaporation efficiency and increased energy consumption.
[0004] Currently, to avoid scaling and clogging of the demister, it is necessary to disassemble and clean it offline. After shutdown, the demister is removed and flushed with high-pressure water, which is complicated and disrupts the stable operation of the production system. Utility Model Content
[0005] The purpose of this invention is to provide a cleaning system for use in demisters to solve the problems existing in the prior art.
[0006] This utility model is implemented by the following technical solution: a cleaning system used on a demister, which includes an evaporation tower, a nozzle assembly, a circulating pump, an inlet pipeline, a circulating pipeline, a citric acid tank, a sodium carbonate tank, a water tank, a pH sensor, a first pressure sensor, and a second pressure sensor. The demister is installed at the top of the evaporation tower, and the nozzle assembly is located inside the evaporation tower above the demister. The top of the evaporation tower is connected to the liquid inlet pipeline, which extends into the evaporation tower and connects to the nozzle assembly. The bottom of the evaporation tower is connected to the circulation pipeline, and a circulation pump is installed on the circulation pipeline. The outlet of the circulation pipeline is connected to the middle of the liquid inlet pipeline. The liquid inlet pipeline is connected to the citric acid tank, the sodium carbonate tank, and the water tank via pipelines. A first chemical valve is located at the outlet of the citric acid tank, a second chemical valve is located at the outlet of the sodium carbonate tank, and a flushing valve is located at the outlet of the water tank. A first pressure sensor is located inside the evaporation tower below the demister, and a second pressure sensor is located at the exhaust port of the evaporation tower. An alarm is installed outside the evaporation tower. The first and second pressure sensors are electrically connected to the signal input terminal of the controller, and the signal output terminal of the controller is electrically connected to the alarm, the first chemical valve, and the circulation pump. The pH sensor is installed on the circulation pipeline at the bottom of the evaporation tower; the pH sensor is electrically connected to the signal input terminal of the controller, and the signal output terminal of the controller is electrically connected to the second reagent valve and the flushing valve respectively.
[0007] Preferably, a compressed air line is also connected to the liquid inlet line near the inlet end, and a pneumatic valve is provided on the compressed air line.
[0008] Preferably, the nozzle assembly includes a plurality of concentrically arranged and interconnected annular tubes and a plurality of atomizing nozzles that are evenly distributed and fixed along the circumference at the bottom of each annular tube and are oriented toward the demister.
[0009] Preferably, an evaporation pipeline is provided at the bottom of the evaporation tower, and an evaporation valve is provided on the evaporation pipeline.
[0010] Advantages of this invention: This invention uses the pressure difference between the inside of the evaporator and the exhaust port of the evaporator. When the difference reaches 0.02 MPa, an alarm is triggered, prompting the operator to open the vent valve to drain the concentrated liquid at the bottom of the evaporator, and then close the vent valve. The operator then opens the first reagent valve and the pneumatic valve, starts the circulation pump, and the citric acid solution in the citric acid tank enters the evaporator through the inlet pipeline to clean the demister. After the circulation pump runs for 2 hours, the timer transmits a signal to the controller, which automatically closes the first reagent valve and opens the second reagent valve, allowing the sodium carbonate solution in the sodium carbonate tank to enter the evaporator through the inlet pipeline. Inside the evaporator, the demister is flushed to neutralize the citric acid solution. When the pH sensor detects that the pH of the flushing solution is ≥6.5, the pH sensor transmits a signal to the controller. The controller automatically closes the second reagent valve and opens the flushing valve, using 4-5 MPa high-pressure flushing water to flush the demister. Throughout the cleaning process, compressed air blows and impacts the scale. After the circulating pump continues to run for 5 minutes, the timer transmits a signal to the controller, which automatically closes the flushing valve and stops the circulating pump. The operator closes the pneumatic valve and opens the vent valve to discharge the cleaning waste liquid, completing the cleaning process. The operation is simple and avoids offline disassembly and cleaning. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of this utility model.
[0012] Figure 2 This is a schematic diagram of the nozzle assembly.
[0013] Figure 3 This is a schematic diagram of the control principle of this utility model.
[0014] In the diagram: 1. Evaporation tower; 2. Nozzle assembly; 2.1. Ring pipe; 2.2. Atomizing nozzle; 3. Circulation pump; 4. Liquid inlet line; 5. Circulation line; 6. Citric acid tank; 7. Sodium carbonate tank; 8. Water tank; 9. Compressed air line; 10. pH sensor; 11. First pressure sensor; 12. Second pressure sensor; 13. Demister; 14. First reagent valve; 15. Second reagent valve; 16. Flushing valve; 17. Pneumatic valve; 18. Controller; 19. Drain line; 20. Drain valve; 21. Forced circulation pump; 22. Heater; 23. Alarm. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0016] like Figures 1-3 As shown, an automatic cleaning system for a demister includes an evaporation tower 1, a nozzle assembly 2, a circulation pump 3, an inlet pipeline 4, a circulation pipeline 5, a citric acid tank 6, a sodium carbonate tank 7, a water tank 8, a compressed air pipeline 9, a pH sensor 10, a first pressure sensor 11, and a second pressure sensor 12. A demister 13 is installed at the top inside the evaporator tower 1. Inside the evaporator tower 1 above the demister 13, a nozzle assembly 2 is provided. The nozzle assembly 2 includes several concentrically arranged and interconnected annular pipes 2.1 and multiple atomizing nozzles 2.2 evenly distributed and fixed circumferentially at the bottom of each annular pipe 2.1, facing the demister 13. A liquid inlet pipe 4 is connected to the top of the evaporator tower 1, extending into the evaporator tower 1 and connecting to the nozzle assembly 2. A circulation pipe 5 is connected to the bottom of the evaporator tower 1, and a circulation pump 3 is installed on the circulation pipe 5. The outlet of the circulation pipe 5 is connected to the liquid inlet. The middle section of pipeline 4 is connected; citric acid tank 6, sodium carbonate tank 7, and water tank 8 are respectively connected to the liquid inlet pipeline 4 via pipelines. A first reagent valve 14 is provided at the outlet of citric acid tank 6, which stores citric acid solution with pH=3.0-4.0. A second reagent valve 15 is provided at the outlet of sodium carbonate tank 7, which stores sodium carbonate solution with pH=9-10. A flushing valve 16 is provided at the outlet of water tank 8. A compressed air pipeline 9 is connected to the liquid inlet pipeline 4, and a pneumatic valve 17 is provided on the compressed air pipeline 9. A first pressure sensor 11 is installed inside the evaporation tower 1 below the demister 13, and a second pressure sensor 12 is installed at the exhaust port of the evaporation tower 1. An alarm 23 is installed outside the evaporation tower 1. The first pressure sensor 11 and the second pressure sensor 12 are electrically connected to the signal input terminal of the controller 18. The signal output terminal of the controller 18 is electrically connected to the alarm 23, the first reagent valve 14, the pneumatic valve 17 and the circulating pump 3, respectively. A pH sensor 10 is installed on the circulation pipeline 5 at the bottom of the evaporator tower 1; the pH sensor 10 is electrically connected to the signal input terminal of the controller 18, and the signal output terminal of the controller 18 is electrically connected to the second reagent valve 15 and the flushing valve 16 respectively. An evaporation tower 1 is provided with an evaporation pipeline 19 at the bottom, and an evaporation valve 20 is provided on the evaporation pipeline 19.
[0017] Working principle: When the first pressure sensor 11 and the second pressure sensor 12 monitor the pressure inside the evaporator 1 and at the exhaust port of the evaporator 1 in real time, when the difference reaches 0.02MPa, the alarm 23 will sound an alarm, prompting the operator to open the vent valve 20, drain the concentrated liquid at the bottom of the evaporator 1, and then close the vent valve 20. The operator opens the first reagent valve 14, the pneumatic valve 17 and the circulation pump 3. The citric acid solution in the citric acid tank 6 enters the evaporation tower 1 through the liquid inlet pipeline 4 and is sprayed out from the atomizing nozzle 2.2 to clean the demister 13. After the circulating pump 3 has been running for 2 hours, the timer 3.1 inside the circulating pump 3 sends a signal to the controller 18. The controller 18 automatically controls the first reagent valve 14 to close and the second reagent valve 15 to open. The sodium carbonate solution in the sodium carbonate tank 7 enters the evaporation tower 1 through the liquid inlet pipeline 4 and is sprayed out from the atomizing nozzle 2.2 to rinse the demister 13 and neutralize the citric acid solution. When the pH sensor 10 detects that the pH of the flushing solution is ≥6.5, the controller 18 automatically controls the second agent valve 15 to close and the flushing valve 16 to open, using 4-5 MPa high-pressure flushing water to flush the demister 13. Throughout the entire cycle cleaning process, compressed air is supplied to the liquid inlet line 4 through the compressed air line 9, and the compressed air is sprayed out from the atomizing nozzle 2.2 to blow away and impact the scale. After the circulating pump 3 continues to run for 5 minutes, the timer 3.1 inside the circulating pump 3 sends a signal to the controller 18 again. The controller 18 automatically controls the flushing valve 16 and the circulating pump 3 to shut down. The operator closes the pneumatic valve 17 and opens the drain valve 20 to discharge the cleaning waste liquid, thus completing the demister cleaning.
[0018] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "front", "rear", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model.
Claims
1. A cleaning system for use in a demister, characterized in that, It includes an evaporation tower, a nozzle assembly, a circulating pump, an inlet pipeline, a circulation pipeline, a citric acid tank, a sodium carbonate tank, a water tank, a pH sensor, a first pressure sensor, and a second pressure sensor; The demister is installed at the top of the evaporation tower, and the nozzle assembly is located inside the evaporation tower above the demister. The top of the evaporation tower is connected to the liquid inlet pipeline, which extends into the evaporation tower and connects to the nozzle assembly. The bottom of the evaporation tower is connected to the circulation pipeline, and a circulation pump is installed on the circulation pipeline. The outlet of the circulation pipeline is connected to the middle of the liquid inlet pipeline. The liquid inlet pipeline is connected to the citric acid tank, the sodium carbonate tank, and the water tank via pipelines. A first chemical valve is located at the outlet of the citric acid tank, a second chemical valve is located at the outlet of the sodium carbonate tank, and a flushing valve is located at the outlet of the water tank. A first pressure sensor is located inside the evaporation tower below the demister, and a second pressure sensor is located at the exhaust port of the evaporation tower. An alarm is installed outside the evaporation tower. The first and second pressure sensors are electrically connected to the signal input terminal of the controller, and the signal output terminal of the controller is electrically connected to the alarm, the first chemical valve, and the circulation pump. The pH sensor is installed on the circulation pipeline at the bottom of the evaporation tower; the pH sensor is electrically connected to the signal input terminal of the controller, and the signal output terminal of the controller is electrically connected to the second reagent valve and the flushing valve respectively.
2. A cleaning system for use in a demister according to claim 1, characterized in that, A compressed air line is also connected to the liquid inlet line near the inlet end, and a pneumatic valve is installed on the compressed air line.
3. A cleaning system for use in a demister according to claim 1 or 2, characterized in that, The nozzle assembly includes several concentrically arranged and interconnected annular tubes and a plurality of atomizing nozzles that are evenly distributed and fixed along the circumference at the bottom of each annular tube and are oriented toward the demister.
4. A cleaning system for use in a demister according to claim 1, characterized in that, An evaporation tower is equipped with an evaporation pipeline at its bottom and an evaporation valve on the evaporation pipeline.