A method for monitoring and adjusting the quality of external cooling water for a converter valve cooling system

Abstract

The present application relates to a kind of external cooling spray water quality monitoring and adjusting method for converter valve cooling system, using water quality monitoring and adjusting system, including spray pool, water quality sampling device, water supply device, automatic dosing device, water quality treatment analysis device, sewage device, water quality sampling device includes water quality sample box, sampling pipeline, sampling pump, water quality test instrument is equipped on water quality sample box, water quality test instrument is connected with water quality treatment analysis device, sampling pipeline is connected with spray pool;Automatic dosing device is connected with spray pool, water quality sample box, under the control of water quality treatment analysis device, selectively dosing to spray pool, water quality sample box;Water supply device, sewage device are connected with water quality treatment analysis device, water quality treatment analysis device according to the size of concentration multiple, control the opening and closing of water supply device, sewage device.The present application can determine appropriate amount of medicament according to different water quality, improve the efficiency of medicament application, reduce on-site personnel operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of on-line monitoring of converter valve cooling systems, and particularly relates to a method for monitoring and adjusting the water quality of external cooling spray water for a converter valve cooling system. BACKGROUND

[0002] As the core equipment of a DC project, a converter valve plays a vital role. A suitable temperature environment is a prerequisite for the safe and stable operation of the converter valve, and a converter valve cooling system (hereinafter referred to as a valve cooling system) is an important equipment for providing a suitable temperature environment for the converter valve. As the core equipment of closed evaporative cooling of the valve cooling system, whether the cooling tower can stably operate directly determines the stable operation of the valve cooling system. When the cooling tower is in operation, the spray water is in contact with the outside world and is constantly concentrated, which will cause a series of changes. In the process of recycling, the spray water is constantly evaporated and supplemented, and various minerals and ions in the water are gradually concentrated and deposited, aggravating the scaling and corrosion tendency of the cooling tower coil. Due to the introduction of foreign matter and dust, the suspended solids and turbidity increase, and the tendency of dirt deposition increases. The growth of microorganisms will be caused by the cooling water at a suitable temperature, and a large amount of algae will grow in the sunlight irradiation part, and a large amount of bacteria will breed in the dark part and generate biological slime, which reduces the cooling effect of the heat exchanger and causes under-deposit corrosion and microbial corrosion. Due to evaporation, the water in the system will become less and less, and the content of various minerals and ions in the water will become more and more concentrated. In order to maintain the salt content in the water at a certain concentration, fresh water must be supplemented and concentrated water must be discharged. Unreasonable water supplementing and discharging causes waste of water resources and environmental pollution.

[0003] In order to cope with the scaling risk caused by the spray water, the valve cooling system usually uses softened produced water for external cooling water supplementing, and adds scale inhibitors in the buffer tank. In order to prevent the growth of algae and the reproduction of bacteria in the external cooling water, bactericides need to be added in the buffer tank. Four kinds of medicaments need to be added in the process of spray water treatment of the valve cooling system, which are non-oxidizing bactericides, oxidizing bactericides, slow-release scale inhibitors and scale dispersants. The dosage of the medicaments is added according to the recommended amount of the medicament manufacturer. The oxidizing bactericides and non-oxidizing bactericides are added periodically, and the slow-release scale inhibitors and scale dispersants are added continuously. Frequent addition of medicaments brings many inconveniences to the site operation and maintenance, and the addition of medicaments is only based on the experience of the medicament manufacturer, without considering the difference in water quality of different converter stations, which often causes over-addition of medicaments in areas with good water quality, resulting in waste of resources. In areas with poor water quality, the amount of medicaments is often insufficient, the cooling tower coil is seriously scaled, and the overall heat exchange efficiency is affected. Unreasonable concentration multiple control also leads to waste of a large amount of water resources and environmental pollution problems caused by sewage discharge.

[0004] Utility model patent CN214990328U discloses an automatic chemical dosing device for a circulating water system. A pH meter on the intelligent control box uses a pH monitoring sensor installed on the cooling tower pipe valve assembly to detect the pH value of the water in the pipeline online. Based on the detected pH value, the intelligent control box controls the chemical dosing device to add chemicals until the water's pH value reaches a suitable level, at which point dosing stops. A conductivity meter on the intelligent control box uses a conductivity monitoring sensor installed on the cooling tower pipe valve assembly to detect the conductivity value of the water in the pipeline online. If the measured value is higher than a set value, the intelligent control box will open a drain valve and discharge wastewater from the drain pipe until the conductivity measurement does not exceed the set value, at which point the drain valve will close and discharge wastewater. The chemical dosing device includes several dosing tanks, each equipped with a dosing pump electrically connected to the intelligent control box. The dosing tanks include an acid tank, an alkali tank, a descaling agent tank, and a bactericide / algaecide tank. Although the dosing device can automatically add the corresponding drugs based on the monitored data, the patent does not address how to measure the amount of drug added each time, given the large size of the spray pool in the cooling system. Summary of the Invention

[0005] The purpose of this invention is to provide a method for monitoring and regulating the water quality of external cooling spray water in a converter valve cooling system, so as to solve the problem of water waste caused by unreasonable dosing strategies and excessive water replenishment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for monitoring and regulating the water quality of external cooling spray water in a converter valve cooling system is disclosed. The system comprises a spray water tank, a water sampling device, a water replenishment device, an automatic dosing device, a water treatment and analysis device, and a sewage discharge device. The water sampling device includes a water sample tank, a sampling pipe, and a sampling pump. A water quality testing instrument is installed on the water sample tank. The water quality testing instrument uses at least one of a conductivity meter, a corrosion rate meter, a hardness meter, and a residual chlorine meter. The water quality testing instrument is connected to the water treatment and analysis device, which analyzes and processes the collected data. The sampling pump is connected to the sampling pipe, which is connected to the spray water tank. The automatic dosing device is connected to both the spray water tank and the water sample tank, and selectively adds chemicals to the spray water tank and the water sample tank under the control of the water treatment and analysis device.

[0008] The water supply device and the sewage discharge device are connected to the water quality treatment and analysis device, and the water quality treatment and analysis device controls the opening and closing of the water supply device and the sewage discharge device.

[0009] Further, the sampling pipeline comprises a first sampling pipeline, a second sampling pipeline and a third sampling pipeline, the sampling pump is connected to the first sampling pipeline, the first sampling pipeline is respectively provided with a first electromagnetic valve and a second electromagnetic valve on two sides of the sampling pump, the third sampling pipeline is connected between the first sampling pipeline and the second sampling pipeline, the third sampling pipeline is provided with a third electromagnetic valve, the second sampling pipeline is provided with a fourth electromagnetic valve and a fifth electromagnetic valve, two ends of the second sampling pipeline are respectively connected to the spray pool and the water sample box, one end of the third sampling pipeline is located between the second electromagnetic valve and the sampling pump, and the second sampling pipeline is connected to the automatic dosing device through a three-way pipe.

[0010] The water quality data is obtained through a water quality tester installed on the water sample box.

[0011] The water quality treatment and analysis device controls the automatic dosing device to continuously add corresponding reagents into the water sample box according to the preset value, and the sampling pump is turned on to circulate the spray water in the water sample box during the reagent adding process, until the water quality data meets the preset value, and the reagent adding is stopped.

[0012] The water quality treatment and analysis device calculates the reagent adding amount Y1 of various reagents required for treating the water sample of the entire spray pool according to the volume V1 of the water sample in the water sample box, the volume V of the spray pool and the amount Y0 of various reagents in step (3).

[0013] The third electromagnetic valve is closed, the second electromagnetic valve and the fifth electromagnetic valve are opened, and the automatic dosing device adds the reagent adding amount Y1 of various reagents into the spray pool.

[0014] Further, the sewage device is connected to the first sampling pipeline, and the connection point is located between the first electromagnetic valve and the sampling pump.

[0015] Further, the spray pool is connected with a liquid level meter, the liquid level meter is connected with the water quality treatment and analysis device, and the water quality treatment and analysis device collects the liquid level of the spray pool.

[0016] Further, the water sample box is provided with a first conductivity tester, and the water supplement device is connected with a second conductivity tester.

[0017] Further, the water quality treatment and analysis device automatically controls the start and stop of the water supplement device and the sewage device according to the calculated concentration ratio and the pre-set concentration ratio threshold, and controls the concentration ratio of the circulating water to fluctuate within the set range.

[0018] The beneficial effects of the present application are:

[0019] The external cooling spray water quality monitoring and adjusting method of the application first samples and detects the water quality, then adjusts the water quality to reach the standard by adding chemicals, and then calculates the amount of chemicals added in the spray water pool according to the volume ratio of the water level of the water quality sample box and the spray water pool, so that the amount of chemicals added in the spray water pool is more accurate. The appropriate amount of chemicals can be determined according to different water quality, the efficiency of chemical application is improved, and the on-site personnel operation and maintenance is reduced.

[0020] Further, by setting the conductivity tester at the spray water pool and the water quality sample box, the concentration ratio is calculated online, and compared with the set value, the start and stop of the automatic control water replenishing device and the sewage device are achieved when the set condition is reached, so that the concentration ratio of the circulating water is controlled to fluctuate within the set range, and the purposes of saving water resources and environmental protection are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is the principle diagram of the system corresponding to the external cooling spray water quality monitoring and adjusting method of the converter valve cooling system of the application;

[0022] Fig. 2 is the flow chart of the external cooling spray water quality monitoring and adjusting method of the converter valve cooling system of the application.

[0023] Corresponding names of each mark in the figure:

[0024] 1, water replenishing device; 2, second conductivity tester; 3, liquid level meter; 4, spray water pool; 5, water quality treatment and analysis device; 6, first conductivity tester; 7, corrosion rate tester; 8, hardness tester; 9, residual chlorine tester; 10, sampling pump; 11, sewage device; 12, water quality sample box; 13, automatic chemical adding device; 14, first sampling pipeline; 15, third sampling pipeline; 16, second sampling pipeline; M1, first electromagnetic valve; M2, second electromagnetic valve; M3, third electromagnetic valve; M4, fourth electromagnetic valve; M5, fifth electromagnetic valve. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application.

[0026] Embodiment:

[0027] As Figs. 1-2As shown, a kind of outer cooling spray water quality monitoring and adjusting system for converter valve cooling system, including spray pool 4, water quality sampling device, water supplementing device 1, automatic dosing device 13, water quality treatment analysis device 5, sewage device 11, water quality sampling device includes water quality sample box 12, sampling pipeline, sampling pump 10, water quality sample box 12 is equipped with water quality tester, water quality tester has conductivity tester, corrosion rate tester 7, hardness tester 8, residual chlorine tester 9, each water quality tester is connected with the water quality treatment analysis device 5, and water quality treatment analysis device 5 carries out analysis processing to the data collected.Water supplementing device 1, sewage device 11 are connected with water quality treatment analysis device 5, and water quality treatment analysis device 5 controls the opening and closing of water supplementing device 1 and sewage device 11.

[0028] Automatic dosing device 13 is connected with spray pool 4 and water quality sample box 12, and under the control of water quality treatment analysis device 5, selectively dosing to spray pool 4 and water quality sample box 12, and the amount of drug is added according to water quality condition.The structure of automatic dosing device 13 is not the innovation point in the present application, and the structure and principle are available in prior art.According to different medicaments, a plurality of drug storage compartments are provided in automatic dosing device 13, and the medicaments are sent out by the built-in pump.

[0029] Corrosion rate tester 7 is used to monitor the corrosion rate of spray water to cooling tower coil, and when the corrosion rate exceeds the set threshold, corrosion and scale inhibitor needs to be added to spray water.Hardness tester 8 is used to monitor the hardness of spray water, and when the hardness of spray water exceeds the set threshold, scale dispersant needs to be added to spray water.Residual chlorine tester 9 is used to monitor the residual chlorine concentration of spray water, and when the residual chlorine concentration in spray water is lower than the set threshold, chlorine-based oxidizing bactericide needs to be added to spray water.

[0030] Sampling pump 10 is connected to sampling pipeline, and sampling pipeline is connected with spray pool 4.Sampling pipeline includes first sampling pipeline 14, second sampling pipeline 16 and third sampling pipeline 15, sampling pump 10 is connected to first sampling pipeline 14, first sampling pipeline 14 is equipped with first electromagnetic valve M1 and second electromagnetic valve M2 on the two sides of sampling pump 10, third sampling pipeline 15 is connected between first sampling pipeline and second sampling pipeline, third sampling pipeline 15 is equipped with third electromagnetic valve M3, fourth electromagnetic valve M4 and fifth electromagnetic valve M5 are equipped on second sampling pipeline, and two ends of second sampling pipeline are connected with spray pool 4 and water quality sample box 12, respectively, one end of third sampling pipeline 15 is located between second electromagnetic valve M2 and sampling pump 10, and the other end is connected with water quality sample box,

[0031] Second sampling pipeline is connected with automatic dosing device 13 through tee pipe.

[0032] The spray pool 4 is connected with a liquid level meter 3, which is an ultrasonic liquid level meter 3, and the liquid level meter 3 is connected with a water quality treatment and analysis device 5, and the water quality treatment and analysis device 5 collects the liquid level height H of the spray pool 4.

[0033] The operation method of the external cooling spray water quality monitoring and adjusting system for the converter valve cooling system comprises the following steps: (1) closing the third electromagnetic valve M3, opening the first electromagnetic valve M1, the second electromagnetic valve M2, the fourth electromagnetic valve M4 and the fifth electromagnetic valve M5, starting the sampling pump 10, until the spray water in the water quality sample tank 12 reaches a predetermined volume V1, and closing the second electromagnetic valve M2 and the fifth electromagnetic valve M5.

[0034] (2) obtaining water quality data through the water quality testers installed on the water quality sample tank 12.

[0035] The conductivity, corrosion rate, total hardness and residual chlorine content of the spray water are P1, F1, G1 and L1 respectively, the conductivity P2 of the replenishment water is measured through the conductivity tester installed on the replenishment device 1, and the standard values of the corrosion rate, total hardness, residual chlorine and concentration multiple are assumed to be F0, G0, L0 and S0.

[0036] (3) the water quality treatment and analysis device 5 controls the automatic dosing device 13 to continuously add corresponding reagents into the water quality sample tank 12 according to the preset values, and the sampling pump 10 is started to make the spray water in the water quality sample tank 12 circulate during the reagent adding process, until the water quality data meet the preset values, and the reagent adding is stopped.

[0037] (4) the water quality treatment and analysis device 5 calculates the dosing amount Y1 of various reagents required for treating the water sample in the entire spray pool 4 according to the volume V1 of the water sample in the water quality sample tank 12, the volume V of the spray pool 4 and the amount Y0 of various reagents in step (3).

[0038] In the application, the water quality is detected through the water quality sample tank 12 first, then the water quality is made to meet the standard through reagent adding, and then the dosing amount in the spray pool 4 is calculated according to the volume ratio of the water level of the water quality sample tank 12 to the spray pool 4, so that the dosing amount is more accurate.

[0039] (5) closing the third electromagnetic valve M3, opening the second electromagnetic valve M2 and the fifth electromagnetic valve M5, and the automatic dosing device 13 adds the dosing amount Y1 of various reagents into the spray pool 4.

[0040] Further, the conductivity tester arranged on the water quality sample box 12 is denoted as a first conductivity tester 6, and the water supplement device 1 is connected with a second conductivity tester 2. The first and second conductivity testers 2 both transmit the detection data to the water quality treatment analysis device 5. The water quality treatment analysis device 5 automatically controls the start and stop of the water supplement device 1 and the sewage device 11 according to the calculated concentration ratio and the pre-set concentration ratio threshold, and controls the concentration ratio of the circulating water to fluctuate in the set range.

[0041] In the embodiment, the sewage device 11 is connected to the first sampling pipeline, and the connection point is located between the first electromagnetic valve M1 and the sampling pump 10. In other embodiments, the sewage device 11 can also be arranged at other appropriate positions, and the water can be discharged by using a pump matched with a pipeline provided with an electromagnetic valve, and the fresh water can be supplemented into the spray pool 4 by the water supplement device 1.

[0042] In the present application, in addition to the dosing, the water in the circulating pipeline composed of the spray pool 4, the first sampling pipeline, the second sampling pipeline, the water quality sample box 12 and the sampling pump 10 is always in a circulating state, and the water quality in the water quality sample box 12 is the same as or basically the same as that in the spray pool 4. The real-time water quality monitoring of the water quality sample box 12 reflects the water quality of the spray pool 4.

[0043] The present application is not limited to the above-mentioned best embodiment, and anyone can derive other various forms of products under the inspiration of the present application, but regardless of any changes in shape or structure, any technical solution with the same or similar technical solution as the present application falls within the protection scope of the present application.

Claims

1. A method for monitoring and adjusting the water quality of external cooling spray water in a converter valve cooling system, characterized in that: A water quality monitoring and regulation system is adopted, including a spray tank, a water sampling device, a water replenishment device, an automatic dosing device, a water treatment and analysis device, and a sewage discharge device. The water sampling device includes a water sample tank, a sampling pipeline, and a sampling pump. The water sample tank is equipped with a water quality testing instrument, which uses at least one of the following: conductivity meter, corrosion rate meter, hardness meter, and residual chlorine meter. The water quality testing instrument is connected to the water treatment and analysis device, which analyzes and processes the collected data. The sampling pump is connected to the sampling pipeline, which is connected to the spray tank. The automatic dosing device is connected to both the spray tank and the water sample tank. Under the control of the water treatment and analysis device, it selectively adds chemicals to the spray tank and the water sample tank by controlling the opening and closing of electromagnetic valves at different positions on the sampling pipeline. The water replenishment device and the sewage discharge device are connected to the water treatment and analysis device. The water treatment and analysis device controls the water replenishment device and the sewage discharge device according to the concentration ratio. The opening and closing of the sewage device; the sampling pipeline includes a first sampling pipeline, a second sampling pipeline, and a third sampling pipeline. The sampling pump is connected to the first sampling pipeline. The first sampling pipeline is equipped with a first solenoid valve and a second solenoid valve on both sides of the sampling pump. The third sampling pipeline is connected between the first sampling pipeline and the second sampling pipeline. The third sampling pipeline is equipped with a third solenoid valve. The second sampling pipeline is equipped with a fourth solenoid valve and a fifth solenoid valve. The two ends of the second sampling pipeline are connected to the spray pool and the water quality sample box, respectively. One end of the third sampling pipeline is located between the second solenoid valve and the sampling pump, and the other end is connected to the water quality sample box. The second sampling pipeline is connected to the automatic dosing device through a three-way pipe. The specific operation method includes the following steps: (1) Close the third solenoid valve, open the first solenoid valve, the second solenoid valve, the fourth solenoid valve, and the fifth solenoid valve, start the sampling pump until the spray water in the water quality sample box reaches the predetermined volume V1, and close the second solenoid valve and the fifth solenoid valve. (2) Obtain water quality data using a water quality testing instrument installed on the water quality sample box; (3) The water quality treatment and analysis device controls the automatic dosing device to continuously add the corresponding reagent to the water quality sample box according to the preset water quality parameter threshold. During the dosing process, the sampling pump is turned on to circulate the spray water in the water quality sample box until the water quality data in the water quality sample box meets the preset value and the dosing stops. (4) The water quality treatment and analysis device calculates the amount of various reagents Y1 required to treat the entire water sample in the spray pool based on the volume V1 of the water sample in the water sample box, the volume V of the spray pool, and the amount Y0 of various reagents added in step (3). (5) Close the third solenoid valve, open the second and fifth solenoid valves, and the automatic dosing device adds the dosage Y1 of various agents to the spray pool.

2. The method for monitoring and adjusting the water quality of external cooling spray water in the converter valve cooling system according to claim 1, characterized in that: The sewage discharge device is connected to the first sampling pipeline, and the connection point is located between the first solenoid valve and the sampling pump.

3. The method for monitoring and adjusting the water quality of external cooling spray water in the converter valve cooling system according to claim 2, characterized in that: The spray tank is connected to a level gauge, which is connected to a water quality treatment and analysis device. The water quality treatment and analysis device collects the water level height of the spray tank.

4. The method for monitoring and adjusting the water quality of external cooling spray water in the converter valve cooling system according to claim 1, characterized in that: The water sample box is equipped with a first conductivity meter, and the water replenishment device is connected to a second conductivity meter. The concentration factor of the spray water is calculated by the conductivity of the replenished water and the spray water.

5. The method for monitoring and adjusting the water quality of external cooling spray water in the converter valve cooling system according to claim 4, characterized in that: The water quality treatment and analysis device automatically controls the start and stop of the water replenishment device and the sewage discharge device based on the calculated concentration ratio and the preset concentration ratio threshold, so as to control the fluctuation of the circulating water concentration ratio within the set range.

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