Chemical adding system capable of accurately regulating and controlling acid-base chemical adding amount

Abstract

The utility model discloses a dosing system capable of accurately regulating and controlling the dosage of acid and alkali, which comprises an acid and alkali storage tank, a high-position dosing tank, a delivery pipe and a first liquid pumping piece, the acid and alkali storage tank is communicated with the high-position dosing tank through the delivery pipe, and the first liquid pumping piece is connected with the delivery pipe, the bottom of the high-level dosing tank is communicated with at least one first dosing pipe used for a first-level pH regulation and control dosing point and at least one second dosing pipe used for a second-level pH regulation and control dosing point, the first dosing pipe is connected with a first manual valve and a pneumatic valve, the pneumatic valve is located at the tail end of the first dosing pipe, the second dosing pipe is connected with a second manual valve and a regulating valve, and the regulating valve is located at the tail end of the second dosing pipe. And the regulating valve is positioned at the tail end of the second dosing pipe. The technical scheme provided by the utility model has the beneficial effects that the problems that in the prior art, the pH value deviation is relatively large and adverse effects are easily caused to subsequent processes such as reaction flocculation, chemical precipitation and the like due to the fact that an acid-base agent is slightly added excessively or not added in time are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a dosing system technical field, concretely relates to a dosing system of accurate regulation and control acid base dosing quantity. BACKGROUND

[0002] Industrial wastewater treatment usually needs to add acid-base reagent to adjust the pH of wastewater, and the conventional acid-base dosing system and its control method is to set acid-base storage tanks outdoors, use pumps to lift to the acid-base dissolving tanks arranged centrally in the dosing room, dilute and then add to each dosing point by using metering pumps. The on-line pH meter provided at the dosing point is interlocked with the metering pump to control the start and stop of the metering pump and thus the dosing quantity.

[0003] The conventional acid-base dosing system and its control method have the following defects: there is a certain distance between the dosing room and each dosing point, the dosing pipelines are laid overhead in the factory according to the specification to each dosing point, the overhead pipeline in the factory is generally at the high point of the system, when the pH at the dosing point reaches the set value to interlock the metering pump, the reagent in the dosing pipeline at the high point will not stop flowing until the reagent in the dosing pipeline is emptied, which easily leads to over-dosing of the reagent at the dosing point; when the pH at the dosing point reaches the set value to interlock the metering pump, the reagent will first fill the emptied dosing pipeline before being added to the dosing point, which easily leads to untimely addition of the reagent, the pH set value is generally 6-9, near the pH set value, slight over-dosing or untimely addition of the acid-base reagent will cause a large deviation of the pH value, which greatly affects the subsequent processes such as reaction flocculation and chemical precipitation. SUMMARY

[0004] The utility model aims at overcoming the above technical defects, providing a dosing system for accurate regulation and control of acid-base dosing quantity, solving the problem that slight over-dosing or untimely addition of the acid-base reagent in the prior art will cause a large deviation of the pH value, which easily affects the subsequent processes such as reaction flocculation and chemical precipitation.

[0005] To achieve the above technical purpose, the utility model takes the following technical scheme:

[0006] The utility model provides a dosing system for accurate regulation and control of acid-base dosing quantity, comprising an acid-base storage tank, a high-level dosing tank, a conveying pipeline and a first liquid pumping device, the acid-base storage tank is communicated with the high-level dosing tank through the conveying pipeline, and the first liquid pumping device is connected with the conveying pipeline, wherein the bottom of the high-level dosing tank is communicated with at least one first dosing pipeline for a first pH control dosing point and at least one second dosing pipeline for a second pH control dosing point, the first dosing pipeline is connected with a first manual valve and a pneumatic valve, and the pneumatic valve is located at the end of the first dosing pipeline, and the second dosing pipeline is connected with a second manual valve and a regulating valve, and the regulating valve is located at the end of the second dosing pipeline.

[0007] In some embodiments, the liquid inlet of the acid-base storage tank is connected with a liquid guide pipe, and the liquid guide pipe is connected with a second liquid pumping device.

[0008] In some embodiments, the high-position dosing tank is connected with a stirring mechanism for stirring the medicament in the high-position dosing tank.

[0009] In some embodiments, the high-position dosing tank is provided with a liquid level sensor.

[0010] In some embodiments, the front end of the first manual valve is provided with a first branch pipe in communication with the first medicament adding pipe, and the first branch pipe is provided with a third manual valve, and the front end of the second manual valve is provided with a second branch pipe in communication with the second medicament adding pipe, and the second branch pipe is provided with a fourth manual valve.

[0011] In some embodiments, the first liquid pumping device and the second liquid pumping device are acid and alkali resistant pumps.

[0012] In some embodiments, the acid-base storage tank is provided with a protective plate on the side, and the acid-base storage tank is provided with a rain shelter on the top.

[0013] In some embodiments, the conveying pipe is made of a corrosion-resistant pipe with a diameter of DN40-DN50.

[0014] In some embodiments, the inner walls of the acid-base storage tank and the high-position dosing tank are provided with a corrosion-resistant layer.

[0015] In some embodiments, the volume of the high-position dosing tank is 2-5m 3 .

[0016] Compared with the prior art, the medicament adding system for accurately regulating and controlling the acid-base medicament adding amount provided by the utility model, through the acid-base storage tank in communication with the high-position dosing tank via the conveying pipe, the first liquid pumping device connected with the conveying pipe, the first medicament adding pipe for the first-stage pH regulating and medicament adding point and the second medicament adding pipe for the second-stage pH regulating and medicament adding point communicated at the bottom of the high-position dosing tank, the first medicament adding pipe connected with the first manual valve and the pneumatic valve, and the pneumatic valve located at the end of the first medicament adding pipe, the second medicament adding pipe connected with the second manual valve and the regulating valve, and the regulating valve located at the end of the second medicament adding pipe, the acid-base medicament can fill the first medicament adding pipe and the second medicament adding pipe under the action of gravity, when the pneumatic valve or / and the regulating valve is opened, the medicament can be discharged rapidly, the acid-base medicament adding amount can be accurately regulated and controlled, the pH value in the medicament reaction area is ensured to be in the set range, and the treatment effect of the sewage is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the structure schematic view of the medicament adding system for accurately regulating and controlling the acid-base medicament adding amount provided by the utility model embodiment. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.

[0019] In order to solve the technical problem that the pH value deviates greatly and the subsequent processes such as reaction flocculation and chemical precipitation are easily affected adversely when the acid-base medicament is slightly overdosed or not dosed in time in the prior art, the utility model provides a dosing system for accurately regulating and controlling the acid-base dosing amount, which can accurately regulate and control the acid-base dosing amount, ensure that the pH value in the dosing reaction zone is within the set range, and improve the purification effect of sewage.

[0020] Please refer to Figure 1 , Figure 1 The dosing system for accurately regulating and controlling the acid-base dosing amount in an embodiment of the utility model comprises an acid-base storage tank 1, a high-position dosing tank 2, a conveying pipe 3 and a first liquid pumping device 4, the acid-base storage tank 1 is communicated with the high-position dosing tank 2 via the conveying pipe 3, the first liquid pumping device 4 is connected with the conveying pipe 3, wherein the bottom of the high-position dosing tank 2 is communicated with at least one first dosing pipe 21 for a primary pH regulation dosing point and at least one second dosing pipe 22 for a secondary pH regulation dosing point, the first dosing pipe 21 is connected with a first manual valve 211 and a pneumatic valve 212, and the pneumatic valve 212 is located at the end of the first dosing pipe 21, the second dosing pipe 22 is connected with a second manual valve 221 and a regulating valve 222, and the regulating valve 222 is located at the end of the second dosing pipe 22.

[0021] It should be noted that in order to facilitate the conveying of the acid-base medicament in the acid-base tank truck to the acid-base storage tank 1, the liquid inlet of the acid-base storage tank 1 is connected with a liquid guide pipe, and the liquid guide pipe is connected with a second liquid pumping device 5, which pumps the acid-base medicament in the acid-base tank truck to the acid-base storage tank 1.

[0022] Specifically, the first liquid pumping device 4 and the second liquid pumping device 5 are both acid and alkali resistant pumps, which are specially designed for conveying corrosive liquids such as acids, bases and other corrosive chemicals. Such pumps are usually made of special materials to ensure that they are not eroded or damaged when in contact with corrosive media.

[0023] In an embodiment, the acid-base storage tank 1 is provided with a protective plate on the side, specifically, the protective plate can prevent the acid-base from overflowing when the maximum leakage amount of the acid-base in a one-time accident is reached, and in addition, the top of the acid-base storage tank 1 is provided with a rain shelter.

[0024] In order to ensure that the acid and alkali medicaments in the high-adding tank 2 are uniformly mixed, the high-adding tank 2 is connected with a stirring mechanism 6, and the medicaments in the high-adding tank 2 can be stirred through the stirring mechanism 6.

[0025] It should be noted that the medicaments in the high-adding tank 2 flow to the medicament adding point by gravity through the first medicament adding pipe 21 and / or the second medicament adding pipe 22, wherein the volume of the high-adding tank 2 is 2-5 m 3 In the embodiment, the volume of the high-adding tank 2 is 5 m 3 In addition, the inner walls of the acid and alkali storage tank and the high-adding tank are provided with corrosion-resistant layers.

[0026] In addition, the high-adding tank 2 is provided with a liquid level sensor 7, through which the acid and alkali medicaments in the high-adding tank 2 can be monitored. When the acid and alkali medicaments in the high-adding tank 2 are 0.2 m away from the bottom of the high-adding tank 2, the acid and alkali medicaments in the acid and alkali storage tank 1 are pumped into the high-adding tank 2 through the first liquid pumping device 4. When the acid and alkali medicaments in the high-adding tank 2 are 0.3 m away from the top of the high-adding tank 2, the first liquid pumping device 4 stops working.

[0027] It should be noted that the pipe diameters of the first medicament adding pipe and the second medicament adding pipe are generally small, and the flow rate of the medicaments is low. After running for a period of time, impurities in the medicaments will deposit in the first medicament adding pipe and the second medicament adding pipe, causing blockage. Regular maintenance is required.

[0028] On the basis of the above scheme, the front end of the first manual valve 211 is provided with a first branch pipe 213 in communication with the first medicament adding pipe 21, and the first branch pipe 213 is provided with a third manual valve 214. The front end of the second manual valve 221 is provided with a second branch pipe 223 in communication with the second medicament adding pipe 22, and the second branch pipe 223 is provided with a fourth manual valve 224.

[0029] Specifically, when the first medicament adding pipe 21 is overhauled, the first manual valve 211 is closed and the third manual valve 214 is opened for medicament adding. When the second medicament adding pipe 22 is overhauled, the second manual valve 221 is closed and the fourth manual valve 224 is opened for medicament adding.

[0030] It should be noted that, in order to avoid corrosion of the pipelines in the medicament adding system, the liquid guide pipe, the first medicament adding pipe, the second medicament adding pipe, the first branch pipe 213, the second branch pipe 223 and the conveying pipe 3 are all made of corrosion-resistant pipes. The conveying pipe 3 is made of a corrosion-resistant pipe with a diameter of DN40-DN50. The diameter of the conveying pipe 3 is larger, and the flow rate of the acid and alkali medicaments in the conveying pipe 3 can reach 0.6-1.5 m / s, which can effectively avoid the problem of deposition and blockage of impurities in the medicaments.

[0031] In order to better understand the utility model, the following is combined with Figure 1 The technical scheme of the utility model is described in detail.

[0032] The high-position adding tank 2 is arranged at the middle position of the area where the acid and alkali dosing points are relatively concentrated, so that the distance from the high-position adding tank 2 to each dosing point is relatively short; the dosing point pH on-line instrument interlock controls the pneumatic valve or the regulating valve; when the first dosing pipe 21 is used for the first-stage pH regulation and control dosing point, the pneumatic valve + the first manual valve are adopted; the dosing point pH on-line instrument interlock controls the start and stop of the pneumatic valve, so as to regulate and control the acid and alkali dosing amount; when the second dosing pipe is used for the second-stage pH regulation and control dosing point, the regulating valve + the second manual valve are adopted; the dosing point pH on-line instrument interlock controls the opening degree of the regulating valve, so as to linearly and accurately regulate and control the acid and alkali dosing amount.

[0033] The specific implementation mode of the utility model described above does not constitute a limitation on the protection scope of the utility model. Any various other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A dosing system for accurately controlling the amount of acid and alkali dosing, comprising an acid and alkali storage tank, a high-level dosing tank, a delivery pipe, and a first liquid extraction component, characterized in that: The acid and alkali storage tank is connected to the high-level dosing tank via the delivery pipe, and the first liquid pumping component is connected to the delivery pipe, wherein the bottom of the high-level dosing tank is connected with at least one first dosing pipe for a primary pH control dosing point, and at least one second dosing pipe for a secondary pH control dosing point, the first dosing pipe is connected with a first manual valve and a pneumatic valve, and the pneumatic valve is located at the end of the first dosing pipe, the second dosing pipe is connected with a second manual valve and a regulating valve, and the regulating valve is located at the end of the second dosing pipe.

2. A dosing system for accurately controlling the amount of acid and alkali dosing according to claim 1, characterized in that: The liquid inlet of the acid and alkali storage tank is connected to a liquid guide tube, and the liquid guide tube is connected to a second liquid extraction component.

3. The dosing system for accurately controlling the amount of acid and alkali according to claim 1 is characterized in that: The high-position dosing tank is connected to a stirring mechanism, and the stirring mechanism is used to stir the medicine in the high-position dosing tank.

4. A dosing system for accurately controlling the amount of acid and alkali dosing according to any one of claims 1 to 3, characterized in that: A liquid level sensor is provided in the high-position dosing tank.

5. The dosing system for accurately controlling the amount of acid and alkali dosing according to claim 1 is characterized in that: The front end of the first manual valve is provided with a first branch pipe connected to the first dosing pipe, and the first branch pipe is provided with a third manual valve. The front end of the second manual valve is provided with a second branch pipe connected to the second dosing pipe, and the second branch pipe is provided with a fourth manual valve.

6. A dosing system for accurately controlling the amount of acid and alkali dosing according to claim 2, characterized in that: The first liquid pumping component and the second liquid pumping component are both acid-resistant and alkali-resistant pumps.

7. The dosing system for accurately controlling the amount of acid and alkali dosing according to claim 1 is characterized in that: The acid and alkali storage tanks are provided with protective plates on their sides, and a rainproof shed is provided on the top of the acid and alkali storage tanks.

8. The dosing system for accurately controlling the amount of acid and alkali dosing according to claim 1 is characterized in that: The delivery pipe is made of a corrosion-resistant pipe with a diameter of DN40-DN50.

9. The dosing system for accurately controlling the amount of acid and alkali dosing according to claim 1, characterized in that: The inner walls of the acid and alkali storage tank and the high-position dosing tank are both provided with a corrosion-resistant layer.

10. The dosing system for accurately controlling the amount of acid and alkali dosing according to claim 1, characterized in that: The volume of the high-position dosing tank is 2-5m 3 .

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