Automatic control system for acid regulation of sodium hypophosphite

Abstract

The utility model discloses a sodium hypophosphite acid regulation automatic control system which comprises a plurality of acid regulation kettles (12) connected in parallel, a feed port of each acid regulation kettle (12) is connected with a feed pipeline (3) through an acid regulation kettle feed valve (5), and an air inlet of each acid regulation kettle (12) is connected with a compressed air pipeline (10) through a compressed air feed valve (11). An acid inlet of each acid adjusting kettle (12) is connected with a hypophosphorous acid feeding pipeline (7) through a hypophosphorous acid feeding valve (9), a discharging port of each acid adjusting kettle (12) is connected with an acid adjusting kettle discharging pump (16) in parallel through an acid adjusting kettle discharging valve (15), and all operations can be automatically controlled by a DCS computer, so that interference of manual control is reduced, control is accurate, and the automation degree of the device is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of sodium hypophosphite acid conditioning technology, and in particular to an automatic control system for sodium hypophosphite acid conditioning. Background Technology

[0002] Sodium hypophosphite is produced through a reaction in a strongly alkaline environment. The finished product requires a neutral pH value, and the pH of the reaction solution must be adjusted by acidification. In order to achieve automated continuous production, a DCS control system has been introduced in the existing production process. However, the following problems exist in the traditional process:

[0003] Sodium hypophosphite acid adjustment was not connected and matched with the DCS control system. The adjustment was done manually. After the adjustment was qualified in the adjustment vessel, it was transferred to the evaporation feed tank. The feeding of the evaporation system was also managed manually. The accuracy of manual operation was low and the degree of automation was low. Utility Model Content

[0004] This utility model provides an automatic control system for sodium hypophosphite acid adjustment, aiming to solve the problems of the above-mentioned sodium hypophosphite acid adjustment not being connected and matched with the DCS control system, the adjustment station being operated manually, the worker adjusting the acid in the adjustment vessel and then transferring it to the evaporation feed tank after it is qualified, and the feeding of the evaporation system also being managed manually, resulting in low precision and low degree of automation. By utilizing the automatic acid adjustment control system technology, the acid adjustment is automatically controlled through the DCS control system of the workshop central control center.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] An automatic control system for sodium hypophosphite acid conditioning includes several acid conditioning vessels connected in parallel. The inlet of each acid conditioning vessel is connected to a feed pipeline through an acid conditioning vessel feed valve. The air inlet of each acid conditioning vessel is connected to a compressed air pipeline through a compressed air feed valve. The acid inlet of each acid conditioning vessel is connected to a hypophosphite feed pipeline through a hypophosphite feed valve. The outlet of each acid conditioning vessel is connected in parallel to an acid conditioning vessel discharge pump through an acid conditioning vessel discharge valve.

[0007] Each of the acidification treatment vessels is equipped with a liquid level sensor and an online pH monitor. The liquid level sensor, the online pH monitor, the acidification treatment vessel feed valve, the compressed air feed valve, the hypophosphoric acid feed valve, and the acidification treatment vessel discharge valve are all connected to an external DCS control system. The liquid level sensor is linked with the corresponding acidification treatment vessel feed valve through the external DCS control system, and the online pH monitor is linked with the corresponding compressed air feed valve, hypophosphoric acid feed valve, and acidification treatment vessel discharge valve through the external DCS control system.

[0008] Preferably, the acid conditioning reactor feed valve, compressed air feed valve, hypophosphoric acid feed valve, and acid conditioning reactor discharge valve are all electrically controlled valves.

[0009] Preferably, the feed line is connected to the valve at the outlet of the acid-adjusted feed tank via an acid-adjusted feed pump.

[0010] More preferably, an acid-adjusting feed flow meter is provided on the side of the feed pipeline near the acid-adjusting feed pump.

[0011] Preferably, the compressed air line is connected to a clean compressed air source.

[0012] Preferably, the hypophosphoric acid feed pipeline is connected to the valve at the outlet of the hypophosphoric acid storage tank.

[0013] More preferably, a hypophosphoric acid flow meter is installed on the side of the hypophosphoric acid feed pipeline near the hypophosphoric acid storage tank.

[0014] Preferably, the outlet of the acid conditioning reactor discharge pump is connected to the acid conditioning discharge fine filter, and the discharge from the acid conditioning reactor enters the evaporation feed storage tank after being filtered by the acid conditioning discharge fine filter.

[0015] The beneficial effects of this utility model are:

[0016] The acid conditioning process in this system is fully automated. The feed liquid is automatically pumped into the acid conditioning kettle, and the acid conditioning is controlled by a DCS system. After passing the acid conditioning, the feed liquid is transferred to the evaporation feed liquid storage tank by a pump. The evaporation system adopts fully automated feeding and discharging control. All operations can be automatically controlled by DCS computer, thereby reducing the interference of manual control, achieving precise control, and greatly improving the automation level of this device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the system connection of this utility model;

[0018] In the diagram: 1. Acid-adjusting feed tank; 2. Acid-adjusting feed pump; 3. Feed pipeline; 4. Acid-adjusting feed flow meter; 5. Acid-adjusting reactor feed valve; 6. Hypophosphoric acid storage tank; 7. Hypophosphoric acid feed pipeline; 8. Hypophosphoric acid flow meter; 9. Hypophosphoric acid feed valve; 10. Compressed air pipeline; 11. Compressed air feed valve; 12. Acid-adjusting reactor; 13. Liquid level sensor; 14. Online pH monitor; 15. Acid-adjusting reactor discharge valve; 16. Acid-adjusting reactor discharge pump; 17. Acid-adjusting discharge fine filter; 18. Evaporation feed storage tank. Detailed Implementation

[0019] The embodiments will be further described below with reference to the accompanying drawings.

[0020] like Figure 1As shown in the preferred embodiment 1, an automatic control system for sodium hypophosphite acid conditioning includes several acid conditioning vessels 12 connected in parallel. The inlet of each acid conditioning vessel 12 is connected to the feed pipeline 3 through an acid conditioning vessel feed valve 5. The air inlet of each acid conditioning vessel 12 is connected to the compressed air pipeline 10 through a compressed air feed valve 11. The acid inlet of each acid conditioning vessel 12 is connected to the hypophosphite feed pipeline 7 through a hypophosphite feed valve 9. The outlet of each acid conditioning vessel 12 is connected in parallel to the acid conditioning vessel discharge pump 16 through an acid conditioning vessel discharge valve 15.

[0021] Each of the acidification tanks 12 is equipped with a level sensor 13 and an online pH monitor 14. The level sensor 13, the online pH monitor 14, the acidification tank feed valve 5, the compressed air feed valve 11, the hypophosphorous acid feed valve 9, and the acidification tank discharge valve 15 are all connected to an external DCS control system. The level sensor 13 is linked with the corresponding acidification tank feed valve 5 on the acidification tank 12 through the external DCS control system. The online pH monitor 14 is linked with the corresponding compressed air feed valve 11, hypophosphorous acid feed valve 9, and acidification tank discharge valve 15 on the acidification tank 12 through the external DCS control system.

[0022] The liquid level is detected by the liquid level sensor 13, and the feeding amount is controlled by the DCS control system for automatic feeding; the pH value is detected by the online pH monitor 14, and the pH adjustment process is controlled by the DCS control system.

[0023] The acid conditioning reactor inlet valve 5, compressed air inlet valve 11, hypophosphoric acid inlet valve 9, and acid conditioning reactor outlet valve 15 are all electrically controlled valves. This facilitates linkage control via a DCS control system.

[0024] The feed line 3 is connected to the valve at the outlet of the acid-adjusting feed tank 1 via the acid-adjusting feed pump 2.

[0025] An acid-adjusting feed flow meter 4 is installed on the side of the feed pipeline 3 near the acid-adjusting feed pump 2. This facilitates control of the feed rate.

[0026] The compressed air line 10 is connected to a clean compressed air source. It is used for preliminary pH adjustment and stabilization.

[0027] The hypophosphite feed pipeline 7 is connected to the valve at the outlet of the hypophosphite storage tank 6.

[0028] A hypophosphite flow meter 8 is installed on the side of the hypophosphite feed pipeline 7 near the hypophosphite storage tank 6 to facilitate control of the discharge rate.

[0029] The discharge port of the acid conditioning reactor discharge pump 16 is connected to the acid conditioning discharge fine filter 17. After being filtered by the acid conditioning discharge fine filter 17, the discharge from the acid conditioning reactor enters the evaporation feed storage tank 18.

[0030] As a preferred embodiment 2, the pH online monitor 14 can be an MDC-P1 / P2 pH online monitor, and the liquid level sensor 13 can be a PCM266 liquid level sensor.

[0031] The working principle of this utility model:

[0032] 1. After passing the carbonization process and filtering, the liquid enters the acid conditioning feed tank 1 in preparation for acid conditioning. The acid conditioning tank feed valve 5 is opened, and the system automatically pumps the liquid directly into the acid conditioning tank 12 through the acid conditioning feed pump 2 and the acid conditioning feed pipeline 3. When the system reaches the set liquid level through the automatic liquid level sensor 13, the feed valve 5 is automatically closed to stop feeding. The compressed air valve 11 is opened, and clean compressed air is introduced through the compressed air pipeline 10 for stirring.

[0033] 2. The system automatically displays the feed rate through the feed flow meter 4. After the automatic pH online monitor 14 detects that the pH value of the feed solution is stable, the system automatically starts the hypophosphite feed valve 9 to inject qualified hypophosphite into the acid conditioning tank for acid conditioning. The system's automatic pH detection system runs at the same time. When the pH value reaches the qualified range, the hypophosphite feed valve is adjusted to decrease. After the pH value of the feed solution is detected to be qualified, the hypophosphite feed is automatically stopped.

[0034] 3. After the pH value of the liquid stabilizes for about half an hour without change and remains within the qualified range, the system automatically shuts off the compressed gas agitator, opens the bottom discharge valve 15 of the acid conditioning tank, and uses the discharge pump 16 of the acid conditioning tank to pass the liquid through the fine filter 17 for one fine filtration. The qualified liquid enters the evaporation feed storage tank 18, and is automatically fed by the evaporation feed pump for evaporation.

Claims

1. An automatic control system for sodium hypophosphite acid adjustment, characterized in that, It includes several acid conditioning vessels (12) connected in parallel. The inlet of each acid conditioning vessel (12) is connected to the feed line (3) through the acid conditioning vessel feed valve (5). The air inlet of each acid conditioning vessel (12) is connected to the compressed air line (10) through the compressed air feed valve (11). The acid inlet of each acid conditioning vessel (12) is connected to the hypophosphorous acid feed line (7) through the hypophosphorous acid feed valve (9). The outlet of each acid conditioning vessel (12) is connected in parallel to the acid conditioning vessel discharge pump (16) through the acid conditioning vessel discharge valve (15). Each of the acid conditioning tanks (12) is equipped with a level sensor (13) and a pH online monitor (14). The level sensor (13), pH online monitor (14), acid conditioning tank feed valve (5), compressed air feed valve (11), hypophosphorous acid feed valve (9), and acid conditioning tank discharge valve (15) are all connected to an external DCS control system. The level sensor (13) is linked with the acid conditioning tank feed valve (5) on the corresponding acid conditioning tank (12) through the external DCS control system. The pH online monitor (14) is linked with the compressed air feed valve (11), hypophosphorous acid feed valve (9), and acid conditioning tank discharge valve (15) on the corresponding acid conditioning tank (12) through the external DCS control system.

2. The sodium hypophosphite acid-adjusting automatic control system according to claim 1, characterized in that, The acid conditioning reactor feed valve (5), compressed air feed valve (11), hypophosphoric acid feed valve (9), and acid conditioning reactor discharge valve (15) are all electrically controlled valves.

3. The sodium hypophosphite acid-adjusting automatic control system according to claim 1, characterized in that, The feed line (3) is connected to the valve at the outlet of the acid-adjusted feed tank (1) via the acid-adjusted feed pump (2).

4. The sodium hypophosphite acid-adjusting automatic control system according to claim 3, characterized in that, An acid-adjusting feed flow meter (4) is installed on the side of the feed pipeline (3) near the acid-adjusting feed pump (2).

5. The sodium hypophosphite acid-adjusting automatic control system according to claim 1, characterized in that, The compressed air line (10) is connected to a clean compressed air source.

6. The automatic control system for sodium hypophosphite acid adjustment according to claim 1, characterized in that, The hypophosphite feed line (7) is connected to the valve at the outlet of the hypophosphite storage tank (6).

7. The sodium hypophosphite acid-adjusting automatic control system according to claim 6, characterized in that, The hypophosphite feed line (7) is equipped with a hypophosphite flow meter (8) on the side near the hypophosphite storage tank (6).

8. The sodium hypophosphite acid-adjusting automatic control system according to claim 1, characterized in that, The outlet of the acid conditioning reactor discharge pump (16) is connected to the acid conditioning discharge fine filter (17). After the acid conditioning reactor discharge is filtered by the acid conditioning discharge fine filter (17), it enters the evaporation feed storage tank (18).

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