Refining agent adding system for membrane denitration
By interlocking the control valve and flow meter with the PH/ORP analyzer, the problem of untimely addition of refining agents in the membrane denitrification system is solved, and timely detection and precise adjustment of brine are achieved, ensuring the quality of the brine, reducing the loss of brine and refining agents, and ensuring the stable operation of the membrane system.
Patent Information
- Application Number
- CN202422653498.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-10-31
AI Technical Summary
The membrane denitrification system cannot add refining agents in a timely and accurate manner, resulting in insufficient removal of free chlorine and increased loss of brine and refining agents.
The pH/ORP analyzer is used to interlock the control valve and electromagnetic flowmeter to achieve timely control and accurate measurement during the brine transportation process, ensuring that the brine quality meets the requirements before entering the membrane system.
By precisely controlling the addition of refining agents, the loss of unqualified brine is reduced and the stable operation of the membrane system is ensured.
Smart Images
Figure CN223397585U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chlor-alkali chemical brine process, in particular to a refining agent adding system for membrane denitrification. Background Art
[0002] Membrane denitrification mainly transports the dechlorinated brine from electrolysis in the chlor-alkali chemical brine process to the membrane system for denitrification treatment. However, the brine after electrolysis will contain some free chlorine. Currently, free chlorine is usually removed by adding refining agents to the brine after electrolysis. However, during the application process, after detecting the free chlorine content in the pipeline, the refining agents cannot be added in time and accurately, resulting in the brine with insufficient free chlorine removal having to be redistributed to the water system, greatly increasing the loss of brine and refining agents. Utility Model Content
[0003] In response to the above technical problems, the present invention provides a refining agent addition system for membrane denitrification, which is used to solve the problem that the refining agent cannot be added in a timely and accurate manner in the membrane denitrification system, resulting in insufficient removal of free chlorine.
[0004] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows:
[0005] A refining agent addition system for membrane denitrification includes a brine water storage tank and a refining agent storage tank, the outlet end of the brine water storage tank is connected to a delivery pump, the delivery pump is connected to an activated carbon filter through a first PH / ORP analyzer, the activated carbon filter is connected to a second PH / ORP analyzer, the second PH / ORP analyzer is provided with two branches, one branch is connected to a water distribution system through a fourth regulating valve, and the other branch is connected to a safety filter through a fifth regulating valve, the safety filter is connected to a membrane system, the refining agent storage tank is connected to the second regulating valve and a second electromagnetic flowmeter in sequence and then to the outlet end of the brine water storage tank, the second electromagnetic flowmeter is electrically connected to the signal input end of the first PH / ORP analyzer, the signal output end of the first PH / ORP analyzer is electrically connected to the second regulating valve, and the signal output end of the second PH / ORP analyzer is electrically connected to the fourth regulating valve and the fifth regulating valve, respectively.
[0006] Furthermore, it also includes a hydrochloric acid storage tank, which is connected to the third regulating valve and the third electromagnetic flowmeter in sequence and then connected to the outlet end of the brine storage tank.
[0007] Furthermore, the third regulating valve is electrically connected to the signal output end of the first PH / ORP analyzer, and the third electromagnetic flowmeter is electrically connected to the signal input end of the first PH / ORP analyzer.
[0008] Furthermore, the inlet end of the desalted brine storage tank is connected in sequence to the first electromagnetic flowmeter and the first regulating valve and then to the inlet end of the refining agent storage tank. The first electromagnetic flowmeter is electrically connected to the signal input end of the first PH / ORP analyzer, and the first regulating valve is electrically connected to the signal output end of the first PH / ORP analyzer.
[0009] Furthermore, the signal output end of the second PH / ORP analyzer is electrically connected to the first regulating valve and the second regulating valve respectively, and the signal input end of the second PH / ORP analyzer is electrically connected to the first electromagnetic flowmeter and the second electromagnetic flowmeter respectively.
[0010] Compared with the prior art, the beneficial effects of the present invention are: the second regulating valve and the second electromagnetic flowmeter are interlockedly controlled by the first PH / ORP analyzer, and the fourth regulating valve and the fifth regulating valve are interlockedly controlled by the second PH / ORP analyzer, thereby completing timely control and precise metering during the brine transportation process, ensuring that the brine after passing through the safety filter is qualified brine free of free chlorine, reducing the loss of unqualified brine, and better ensuring the stable operation of the primary membrane system. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a structural diagram of the utility model;
[0012] In the picture:
[0013] 1. Brine storage tank; 2. First electromagnetic flowmeter; 3. First regulating valve; 4. Second electromagnetic flowmeter; 5. Second regulating valve; 6. Third electromagnetic flowmeter; 7. Third regulating valve; 8. Delivery pump; 9. First PH / ORP analyzer; 10. Activated carbon filter; 11. Second PH / ORP analyzer; 12. Fourth regulating valve; 13. Fifth regulating valve; 14. Safety filter; 15. Refining agent storage tank; 16. Hydrochloric acid storage tank; 17. Water distribution system; 18. Membrane system. DETAILED DESCRIPTION
[0014] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.
[0015] A refining agent addition system for membrane denitrification includes a brine water storage tank 1 and a refining agent storage tank 15. The outlet end of the brine water storage tank 1 is connected to a delivery pump 8, which is connected to an activated carbon filter 10 through a first PH / ORP analyzer 9. The activated carbon filter 10 is connected to a second PH / ORP analyzer 11. The second PH / ORP analyzer 11 has two branches, one branch is connected to a water distribution system 17 through a fourth regulating valve 12, and the other branch is connected to a safety filter 14 through a fifth regulating valve 13. The safety filter 14 is connected to a membrane system 18. The refining agent storage tank 15 is connected to the second regulating valve 5 and the second electromagnetic flowmeter 4 in sequence and then connected to the outlet end of the brine water storage tank 1. The second electromagnetic flowmeter 4 is electrically connected to the signal input end of the first PH / ORP analyzer 9, the signal output end of the first PH / ORP analyzer 9 is electrically connected to the second regulating valve 5, and the signal output end of the second PH / ORP analyzer 11 is electrically connected to the fourth regulating valve 12 and the fifth regulating valve 13 respectively. The first PH / ORP analyzer 9 detects the brine transmitted by the delivery pump 8. When the ORP is within the control range, no adjustment is made and the brine continues to be transported to the activated carbon filter 10. When the ORP is not within the control range, the first PH / ORP analyzer 9 controls the second regulating valve 5 to open, and accurately controls the amount of refining agent added through the data transmitted by the second electromagnetic flowmeter 4; the second PH / ORP analyzer 11 performs a secondary detection on the brine passing through the activated carbon filter 10. When the ORP is not within the control range, the second PH / ORP analyzer 11 controls the fifth regulating valve 13 to close and the fourth regulating valve 12 to open, and the brine that does not meet the requirements is transported to the water distribution system 17 through the fourth regulating valve 12 for re-distribution. When the ORP is within the control range, the second PH / ORP analyzer 11 controls the fourth regulating valve 12 to close and the fifth regulating valve 13 to open, and the brine that meets the requirements enters the security filter 14 through the fifth regulating valve 13 and is sent to the membrane system 18 for denitrification treatment.
[0016] It also includes a hydrochloric acid storage tank 16, which is connected to the third regulating valve 7 and the third electromagnetic flowmeter 6 in sequence and then connected to the outlet end of the brine storage tank 1. When the pH value of the brine in the pipeline is between 5.5 and 7, the dechlorination effect is best. By connecting the hydrochloric acid storage tank 16 to the outlet end of the brine storage tank 1, a certain amount of hydrochloric acid can be added when transporting brine, so that the pH value of the brine can be within the range of 5.5-7.
[0017] The third regulating valve 7 is electrically connected to the signal output end of the first PH / ORP analyzer 9, and the third electromagnetic flowmeter 6 is electrically connected to the signal input end of the first PH / ORP analyzer 9. The first PH / ORP analyzer 9 detects the pH value in the dilute brine. When the pH value is within the range of 5.5-7, no adjustment is made. When the pH value is not within the range of 5.5-7, the first PH / ORP analyzer 9 controls the third regulating valve 7 to open, and transmits hydrochloric acid to the outlet end of the dilute brine storage tank 1 based on the data transmitted by the third electromagnetic flowmeter 6. When the pH value of the dilute brine at the outlet end of the dilute brine storage tank 1 reaches the range of 5.5-7, the first PH / ORP analyzer 9 controls the third regulating valve 7 to close.
[0018] The inlet of the brine water storage tank 1 is connected in sequence to a first electromagnetic flowmeter 2 and a first regulating valve 3, which are then connected to the inlet of the refining agent storage tank 15. The first electromagnetic flowmeter 2 is electrically connected to the signal input of the first pH / ORP analyzer 9, and the first regulating valve 3 is electrically connected to the signal output of the first pH / ORP analyzer 9. A refining agent addition branch is added to the inlet of the brine water storage tank 1 to perform preliminary rough adjustments on the brine entering the brine water storage tank 1. This avoids uneven mixing of the brine and the refining agent due to a one-time adjustment at the outlet of the brine water storage tank 1, improves the addition accuracy, and ensures that free chlorine in the brine can be effectively removed.
[0019] The signal output end of the second PH / ORP analyzer 11 is electrically connected to the first regulating valve 3 and the second regulating valve 5 respectively, and the signal input end of the second PH / ORP analyzer 11 is electrically connected to the first electromagnetic flowmeter 2 and the second electromagnetic flowmeter 4 respectively. After the reaction of part of the free chlorine passes through the activated carbon filter 10, the second PH / ORP analyzer 11 controls the fifth regulating valve 13 to close and the fourth regulating valve 12 to open, and the unqualified brine is transported to the water distribution system 17 through the fourth regulating valve 12 for re-distribution. At the same time, the second PH / ORP analyzer 11 controls the first regulating valve 3 and the second regulating valve 5 to open, and measures the addition of the refining agent to the inlet and outlet ends of the brine storage tank 1 through the first electromagnetic flowmeter 2 and the second electromagnetic flowmeter 4.
[0020] When using:
[0021] The dechlorinated brine from the electrolysis process enters the brine storage tank 1, and is transported by the delivery pump 8 to the first PH / ORP analyzer 9. After detection by the first PH / ORP analyzer 9, the amount of the refining agent added is controlled, and the pH value is accurately adjusted to the range of 5.5-7. The adjusted brine is transported to the activated carbon filter 10 for partial reaction of free chlorine. The brine exiting the activated carbon filter 10 is analyzed by the second PH / ORP analyzer 11. When the ORP is not within the control range, the second PH / ORP analyzer 11 controls the fifth regulating valve 13 to close and the fourth regulating valve 12 to open. The desalinated water that does not meet the requirements is transported to the water distribution system 17 through the fourth regulating valve 12 for redistribution. At the same time, the second PH / ORP analyzer 11 controls the first regulating valve 3 and the second regulating valve 5 to open, and the refining agent is added to the inlet and outlet ends of the desalinated water storage tank 1 through the first electromagnetic flowmeter 2 and the second electromagnetic flowmeter 4. When the ORP is within the control range, the second PH / ORP analyzer 11 controls the fourth regulating valve 12 to close and the fifth regulating valve 13 to open, and the desalinated water that meets the requirements enters the safety filter 14 through the fifth regulating valve 13 and is sent to the membrane system 18 for denitrification treatment.
[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A system for adding a refining agent to membrane denitrification, characterized by: The invention comprises a salt water storage tank (1) and a refining agent storage tank (15), wherein the outlet end of the salt water storage tank (1) is connected to a delivery pump (8), the delivery pump (8) is connected to an activated carbon filter (10) via a first PH / ORP analyzer (9), the activated carbon filter (10) is connected to a second PH / ORP analyzer (11), the second PH / ORP analyzer (11) is provided with two branches, one branch is connected to a water distribution system (17) via a fourth regulating valve (12), and the other branch is connected to a safety filter (14) via a fifth regulating valve (13). The filter (14) is connected to a membrane system (18), the refining agent storage tank (15) is connected in sequence to the second regulating valve (5) and the second electromagnetic flowmeter (4), and then connected to the outlet end of the salt water storage tank (1), the second electromagnetic flowmeter (4) is electrically connected to the signal input end of the first PH / ORP analyzer (9), the signal output end of the first PH / ORP analyzer (9) is electrically connected to the second regulating valve (5), and the signal output end of the second PH / ORP analyzer (11) is electrically connected to the fourth regulating valve (12) and the fifth regulating valve (13).
2. The system for adding a refining agent to membrane denitrification according to claim 1, characterized in that: It also includes a hydrochloric acid storage tank (16), which is connected in sequence to the third regulating valve (7) and the third electromagnetic flowmeter (6) and then to the outlet end of the salt water storage tank (1).
3. The system for adding a refining agent to membrane denitrification according to claim 2, characterized in that: The third regulating valve (7) is electrically connected to the signal output end of the first PH / ORP analyzer (9), and the third electromagnetic flowmeter (6) is electrically connected to the signal input end of the first PH / ORP analyzer (9).
4. The system for adding a refining agent to membrane denitrification according to claim 3, characterized in that: The inlet end of the salt water storage tank (1) is connected in sequence to the first electromagnetic flowmeter (2) and the first regulating valve (3), and then to the inlet end of the refining agent storage tank (15); the first electromagnetic flowmeter (2) is electrically connected to the signal input end of the first pH / ORP analyzer (9); and the first regulating valve (3) is electrically connected to the signal output end of the first pH / ORP analyzer (9).
5. The system for adding a refining agent to membrane denitrification according to claim 4, characterized in that: The signal output end of the second PH / ORP analyzer (11) is electrically connected to the first regulating valve (3) and the second regulating valve (5), respectively, and the signal input end of the second PH / ORP analyzer (11) is electrically connected to the first electromagnetic flowmeter (2) and the second electromagnetic flowmeter (4), respectively.