Saturated salt water PH and ORP production regulation and control system
By designing a saturated brine pH and ORP production and control system, and using detection instruments and DCS controllers to accurately control the amount of hydrochloric acid, sodium sulfite and alkali solution added, the problem of affected adsorption capacity of the chelating resin tower was solved, and the brine hardness index was achieved and stabilized.
Patent Information
- Application Number
- CN202422642515.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-10-31
AI Technical Summary
In the prior art, the adsorption capacity of the chelating resin tower is affected by the pH and ORP in the saturated brine, resulting in the brine hardness metal ion content not meeting the standard and being easily ineffective.
A saturated brine pH and ORP production control system was designed. Through the combination of brine mixing tanks, metering tanks, detection instruments and DCS controllers, the addition amounts of hydrochloric acid, sodium sulfite and alkali solution were accurately controlled to ensure that the brine process indicators met the standards.
It achieves precise control of saturated brine, avoids the reduction or failure of the adsorption capacity of the chelating resin tower, provides qualified brine for subsequent processes, and ensures that the brine hardness index meets the standard.
Smart Images
Figure CN223357470U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical products, in particular to a saturated brine pH and ORP production and control system. Background Art
[0002] Saturated brine is widely used in the chemical industry. In the industrial production process, the content of metal ions such as calcium and magnesium in the brine that affect the hardness of the brine needs to be strictly controlled. Generally, the chelating resin tower adsorption method is used to remove calcium and magnesium ions. However, the adsorption capacity of the chelating resin tower is affected by the pH (acidity) and ORP (free chlorine value) in the saturated brine. Too low pH or too high ORP will affect the activity of the chelating resin or make it ineffective. Therefore, strict control of pH and ORP in saturated brine can ensure that the brine process indicators meet the standards. Utility Model Content
[0003] In view of the above defects in the prior art, the present invention provides a saturated brine pH and ORP production and control system as follows:
[0004] The technical solution of the present utility model is achieved as follows:
[0005] A saturated brine pH and ORP production control system comprises a brine mixing tank, a hydrochloric acid metering tank, a saturated brine tank, a first sodium sulfite metering tank, a second sodium sulfite metering tank, an alkali solution metering tank, and a brine heat exchanger. The brine mixing tank is connected to the hydrochloric acid metering tank and the first sodium sulfite metering tank respectively via pipelines. The brine mixing tank is provided with a first pH detection and control component and a first ORP detection and control component for correspondingly controlling the intake of hydrochloric acid and sodium sulfite. The brine mixing tank is connected to the saturated brine tank via pipelines. The saturated brine tank has an alkali solution inlet. The outlet pipeline of the saturated brine tank is provided with a brine pump. A second pH detection and control component and a second ORP detection and control component are provided on the pipeline at the rear end of the brine pump. An alkali solution insertion tube and a sodium sulfite insertion tube are provided on the pipeline at the front end of the brine pump. The second pH detection and control component is used to control the amount of alkali solution in the alkali solution metering tank entering the brine pump. The second ORP detection and control component is used to control the amount of sodium sulfite in the second sodium sulfite metering tank entering the brine pump. A brine heat exchanger is provided on the pipeline at the rear end of the brine pump. A regulated saturated brine outlet is provided at the rear end of the brine heat exchanger.
[0006] Preferably, the first PH detection and control component and the second PH detection and control component both include a PH detector, a DCS controller and a metering pump, the PH detector is arranged in the tank to be tested through a detection instrument bracket, one end of the DCS controller is connected to the PH detector to receive the detection signal, and the other end is controlled to connect to the metering pump to control its pumping volume; the first ORP detection and control component and the second ORP detection and control component both include an ORP detector, a DCS controller and a metering pump, the ORP detector is arranged in the tank to be tested through a detection instrument bracket, one end of the DCS controller is connected to the ORP detector to receive the detection signal, and the other end is controlled to connect to the metering pump to control its pumping volume.
[0007] Preferably, the brine mixing tank is provided with a backup pH detection component.
[0008] Preferably, the hydrochloric acid metering tank is provided with a pure water inlet and a 31% hydrochloric acid inlet, and both the pure water inlet and the 31% hydrochloric acid inlet are provided with on-site monitoring instruments and a DCS controller.
[0009] Preferably, the saturated brine outlet is provided with an on-site thermal resistor, a DCS controller and an on-site automatic control valve.
[0010] Preferably, the first sodium sulfite metering tank, the second sodium sulfite metering tank and the alkali solution metering tank are all provided with a liquid level gauge, a DCS controller, a switch valve and a field instrument.
[0011] Preferably, the saturated brine tank is provided with a liquid level meter and a DCS controller.
[0012] Preferably, the brine mixing tank is provided with multi-layer baffles for increasing the inflow distance of the brine.
[0013] Compared with the prior art, the present invention has the following beneficial effects:
[0014] The saturated brine pH and ORP production control system of the present invention accurately analyzes pH and free chlorine, accurately controls the metering pump to evenly add hydrochloric acid, sodium sulfite reagent and alkali solution, ensures that the brine process indicators meet the standards, and provides qualified saturated brine for the subsequent chelating resin tower to adsorb metal ions such as calcium and magnesium, avoiding the risk of reduced adsorption capacity or failure of the chelating resin. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is the system principle diagram of the saturated brine pH and ORP production and control system of the utility model.
[0016] In the figure: brine mixing tank 1, hydrochloric acid metering tank 2, saturated brine tank 3, first sodium sulfite metering tank 4, second sodium sulfite metering tank 5, alkali solution metering tank 6, brine heat exchanger 7, first pH detection and control component 8, first ORP detection and control component 9, brine pump 10, second pH detection and control component 11, second ORP detection and control component 12, alkali solution insertion tube 13, sodium sulfite insertion tube 14, pH detector 15, DCS controller 16, metering pump 17, detection instrument bracket 18, ORP detector 19, pH detection component 20, pure water inlet 21, 31% hydrochloric acid inlet 22, on-site monitoring instrument 23, on-site thermal resistor 24, on-site automatic control valve 25, liquid level gauge 26, switch valve 27, on-site instrument 28. DETAILED DESCRIPTION
[0017] The present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.
[0018] like Figure 1As shown, a saturated brine pH and ORP production control system includes a brine mixing tank 1, a hydrochloric acid metering tank 2, a saturated brine tank 3, a first sodium sulfite metering tank 4, a second sodium sulfite metering tank 5, an alkali solution metering tank 6 and a brine heat exchanger 7. The brine mixing tank 1 is connected to the hydrochloric acid metering tank 2 and the first sodium sulfite metering tank 4 through pipelines. The brine mixing tank 1 is provided with a first pH detection and control component 8 and a first ORP detection and control component 9 for correspondingly controlling the amount of hydrochloric acid and sodium sulfite. The brine mixing tank 1 is connected to the saturated brine tank 3 through a pipeline. The saturated brine tank 3 has an alkali solution inlet. The outlet pipeline of the saturated brine tank 3 is provided with a brine pump 10. Since the brine pump 10 has a strong stirring function, a second pH detection and control component 11 and a second ORP detection and control component 12 are provided on the pipeline at the rear end of the brine pump 10. , so that the detection results are more accurate, thereby better controlling the pH and ORP of the saturated brine. An alkali solution insertion tube 13 and a sodium sulfite insertion tube 14 are provided on the pipeline at the front end of the brine pump 10. The second PH detection and control component 11 is used to control the amount of alkali solution in the alkali solution metering tank 6 entering the brine pump 10. The alkali solution enters the brine pump 10 through the alkali solution insertion tube 13. The second ORP detection and control component 12 is used to control the amount of sodium sulfite in the second sodium sulfite metering tank 5 entering the brine pump 10. The sodium sulfite enters the brine pump 10 through the sodium sulfite insertion tube 14, which is used to control the pH and ORP of the saturated brine at all times. A brine heat exchanger 13 is provided on the pipeline at the rear end of the brine pump 10. The rear end of the brine heat exchanger 13 is provided with a regulated saturated brine outlet 14. The brine heat exchanger 13 is used to heat the saturated brine to a predetermined temperature. The first pH detection component 8 and the second pH detection component 11 each include a pH detector 15, a DCS controller 16, and a metering pump 17. The pH detector 15 is installed in the tank to be tested via a detection instrument bracket 18. One end of the DCS controller 16 is connected to the pH detector 15 to receive the detection signal, and the other end is connected to the metering pump 17 to control its pumping volume. The first ORP detection component 9 and the second ORP detection component 12 each include an ORP detector 19, a DCS controller 16, and a metering pump 17. The ORP detector 19 is installed in the tank to be tested via a detection instrument bracket 18. One end of the DCS controller 16 is connected to the ORP detector 19 to receive the detection signal, and the other end is connected to the metering pump 17 to control its pumping volume. The brine mixing tank 1 is provided with a backup pH detection component 20, which includes the pH detector 15 and the DCS controller 16. The pH detection component 20 is used to further determine whether the pH value of the liquid in the tank meets the requirements. It can be compared with the first pH detection component 8 to determine whether the measurement error between the two meets the predetermined setting.The hydrochloric acid metering tank 2 is equipped with a pure water inlet 21 and a 31% hydrochloric acid inlet 22. Both the pure water inlet 21 and the 31% hydrochloric acid inlet 22 are equipped with on-site monitoring instruments 23 and a DCS controller 16 for controlling the inflow of hydrochloric acid and pure water to produce the appropriate concentration of hydrochloric acid. The saturated brine outlet 14 is equipped with an on-site thermal resistor 24, a DCS controller 16, and an on-site automatic control valve 25 for further controlling the temperature of the saturated brine to meet the requirements. The first sodium sulfite metering tank 4, the second sodium sulfite metering tank 5, and the alkali solution metering tank 6 are each equipped with a liquid level gauge 26, a DCS controller 16, an on-off valve 27, and on-site instruments 28 to facilitate monitoring of the liquid level in each tank and control of the inflow of the corresponding liquid. The saturated brine tank 3 is equipped with a liquid level gauge 26 and a DCS controller 16. The brine mixing tank 1 is equipped with multiple layers of baffles to increase the brine inflow distance, ensuring uniform mixing of the brine and the added hydrochloric acid.
[0019] Working process: The saturated brine (T: 50-60°C, P: 3 BarG, PH: 10-11) injected from the previous system enters the brine mixing tank 1. The brine mixing tank 1 is designed with multiple baffles. The brine will flow along the baffles in an "S" shape. While the brine flows, the pH value of the brine is detected by the pH detector 15. The pH value is interlocked with the metering pump 17 through the DCS controller. The metering pump 17 adjusts the stroke length of the metering pump 17 according to the pH value signal to control the amount of hydrochloric acid added. To ensure the accuracy of the control, the hydrochloric acid concentration is diluted from 31% to 17-18%. The brine in the brine mixing tank 1, after the pH is adjusted to meet the requirements, is then tested for its ORP by the ORP detector 19. The ORP is interlocked with the metering pump 17 through the DCS controller. The metering pump 17 adjusts the stroke length of the metering pump 17 according to the ORP signal to control the amount of 5% sodium sulfite added.
[0020] The saturated brine after the pH and ORP are adjusted to meet the requirements enters the saturated brine tank 3 and is then sent to the brine heat exchanger 13 through the brine pump 10 to raise the brine temperature to 60-70°C. The outlet of the brine pump 10 is equipped with a second pH detection and control component 11 and a second ORP detection and control component 12 to analyze the pH and ORP of the brine. When it is found that the pH and ORP of the brine exceed the standard, the pH and ORP are interlocked with the metering pump 17, and the metering pump 17 is controlled according to the signal to adjust the flow rate of 32% NaOH and 5% sodium sulfite, and timely adjust it. Finally, the saturated brine with a good ratio (T: 60-70°C, P: 4BarG, pH: 8-9) is discharged through the saturated brine outlet 14, so that the pH and ORP of the brine meet the standards.
[0021] From the structure and working process of the present invention, it can be seen that the saturated brine pH and ORP production and control system of the present invention accurately analyzes pH and free chlorine, accurately controls the metering pump to evenly add hydrochloric acid, sodium sulfite reagent and alkali solution, ensures that the brine process indicators meet the standards, and provides qualified saturated brine for the subsequent chelating resin tower to adsorb metal ions such as calcium and magnesium, avoiding the risk of reduced adsorption capacity or failure of the chelating resin.
Claims
1. A saturated brine pH and ORP production and control system, characterized in that: The invention comprises a brine mixing tank, a hydrochloric acid metering tank, a saturated brine tank, a first sodium sulfite metering tank, a second sodium sulfite metering tank, an alkali solution metering tank and a brine heat exchanger. The brine mixing tank is connected to the hydrochloric acid metering tank and the first sodium sulfite metering tank respectively through pipelines. The brine mixing tank is provided with a first pH detection and control component and a first ORP detection and control component for correspondingly controlling the intake of hydrochloric acid and sodium sulfite. The brine mixing tank is connected to the saturated brine tank through pipelines. The saturated brine tank has an alkali solution inlet. The outlet pipeline of the saturated brine tank is provided with a brine pump. A second pH detection and control component and a second ORP detection and control component are provided on the pipeline at the rear end of the brine pump. An alkali solution insertion tube and a sodium sulfite insertion tube are provided on the pipeline at the front end of the brine pump. The second pH detection and control component is used to control the amount of alkali solution in the alkali solution metering tank entering the brine pump. The second ORP detection and control component is used to control the amount of sodium sulfite in the second sodium sulfite metering tank entering the brine pump. A brine heat exchanger is provided on the pipeline at the rear end of the brine pump. An outlet for regulated saturated brine is provided at the rear end of the brine heat exchanger.
2. The saturated brine pH and ORP production control system according to claim 1, characterized in that: The first PH detection and control component and the second PH detection and control component both include a PH detector, a DCS controller and a metering pump. The PH detector is set in the tank to be tested through a detection instrument bracket. One end of the DCS controller is connected to the PH detector to receive the detection signal, and the other end is controlled to connect to the metering pump to control its pumping volume; the first ORP detection and control component and the second ORP detection and control component both include an ORP detector, a DCS controller and a metering pump. The ORP detector is set in the tank to be tested through a detection instrument bracket. One end of the DCS controller is connected to the ORP detector to receive the detection signal, and the other end is controlled to connect to the metering pump to control its pumping volume.
3. The saturated brine pH and ORP production control system according to claim 2, characterized in that: The brine mixing tank is provided with a backup pH detection component.
4. The saturated brine pH and ORP production and control system according to claim 1, wherein: The hydrochloric acid metering tank is provided with a pure water inlet and a 31% hydrochloric acid inlet, and both the pure water inlet and the 31% hydrochloric acid inlet are provided with a field monitoring instrument and a DCS controller.
5. The saturated brine pH and ORP production and control system according to claim 1, wherein: The saturated brine outlet is provided with an on-site thermal resistor, a DCS controller and an on-site automatic control valve.
6. The saturated brine pH and ORP production and control system according to claim 2, characterized in that: The first sodium sulfite metering tank, the second sodium sulfite metering tank and the alkali solution metering tank are all provided with a liquid level gauge, a DCS controller, a switch valve and a field instrument.
7. The saturated brine pH and ORP production and control system according to claim 2, wherein: The saturated brine tank is provided with a liquid level meter and a DCS controller.
8. The saturated brine pH and ORP production and control system according to claim 2, wherein: The brine mixing tank is provided with multi-layer baffles for increasing the inflow distance of the brine.