Alkali-resistant and strong-oxidation-resistant concrete storage tank capable of enhancing stability of sodium hypochlorite

Abstract

The utility model discloses an alkali-resistant strong oxidation-resistant concrete storage tank capable of enhancing the stability of sodium hypochlorite, which comprises a closed storage tank body, a chemical inlet pipe, a water inlet pipe and a chemical outlet pipe are connected onto the storage tank body, the lower end of the storage tank body is further connected with a pump front emptying pipe, and the liquid outlet end of the pump front emptying pipe is connected with a return pipe through a circulating emptying pump. The liquid outlet end of the backflow pipe is connected with a medicine inlet pipe, the medicine inlet end of the medicine inlet pipe is connected with a medicine adding pump, the upper end of the storage pool body is further connected with an overflow pipe, the liquid outlet end of the overflow pipe is connected with a pump back emptying pipe through a circulation emptying pump, the top end of the storage pool body is further connected with an air inlet pipe and an exhaust pipe, and the air inlet pipe is connected with a one-way air suction valve. The air inlet end of the one-way air suction valve is connected with a CO2 filter, and the exhaust pipe is connected with a micro-pressure one-way valve. In the storage process, the stability of the medicament is high, decomposition reaction is not easy to occur, and the storage loss of sodium hypochlorite is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sodium hypochlorite storage, in particular to an alkali-resistant and strong oxidation-resistant concrete storage tank capable of enhancing the stability of sodium hypochlorite. Background Art

[0002] Sodium hypochlorite is a highly effective oxidant and chlorine-containing disinfectant with bleaching, bactericidal, and disinfectant properties. It can be used as a bleaching agent, oxidant, and water purifier, primarily in bleaching, papermaking, textiles, pharmaceuticals, fine chemicals, and tap water disinfection. Sodium hypochlorite is unstable and easily decomposes under high temperatures and in the presence of light. At temperatures below 30°C, it typically loses 0.1mg / L to 0.15mg / L of available chlorine per day; at temperatures between 30°C and 35°C, it can lose up to 0.3mg / L to 0.7mg / L of available chlorine per day. When sodium hypochlorite is used for tap water disinfection, water plants typically need to maintain a 10-15 day supply of sodium hypochlorite in their storage tanks, with tanks rotated for use. A water plant producing 300,000 tons of water per day would require 20 tons of sodium hypochlorite per day during hot seasons. To meet this 10-day supply, at least two 100-ton storage tanks would be required. The concentration of sodium hypochlorite is generally 10%. A 1% storage loss would increase costs by approximately 10%. The stability of the stored reagents in existing storage pools is low, and sodium hypochlorite is very likely to undergo decomposition reactions during storage to produce sodium chloride and oxygen. Utility Model Content

[0003] In order to achieve the above-mentioned purpose, the utility model proposes an alkali-resistant and strong oxidation-resistant concrete storage tank that can enhance the stability of sodium hypochlorite, so as to solve the problem that sodium hypochlorite is unstable and easy to decompose in existing storage tanks.

[0004] In order to achieve the above-mentioned purpose, the utility model proposes an alkali-resistant and strong oxidation-resistant concrete storage tank that can enhance the stability of sodium hypochlorite, comprising a closed storage tank body, the storage tank body is connected to a drug inlet pipe, a water inlet pipe and a drug outlet pipe, the lower end of the storage tank body is also connected to a pump front drain pipe, the liquid outlet end of the pump front drain pipe is connected to the return pipe through a circulation drain pump, the liquid outlet end of the return pipe is connected to the drug inlet pipe, the drug inlet end of the drug inlet pipe is connected to a dosing pump, the upper end of the storage tank body is also connected to an overflow pipe, the liquid outlet end of the overflow pipe is connected to the pump rear drain pipe through a circulation drain pump, the top of the storage tank body is also connected to an air inlet pipe and an exhaust pipe, the air inlet pipe is connected to a one-way suction valve, the air inlet end of the one-way suction valve is connected to a CO2 filter, and the exhaust pipe is connected to a micro-pressure one-way valve.

[0005] In the above solution, the micro-pressure check valve is a spherical check valve, and the exhaust end of the spherical check valve is connected to a one-way exhaust valve. The spherical check valve is weighted with 122.5g, ensuring a pressure of 25 kPa in the reservoir. As the reservoir liquid level begins to rise, the air in the reservoir will be compressed due to the counterweighted check valve at the reservoir outlet. Only when the pressure exceeds 25 kPa will the gas be discharged from the reservoir through the spherical check valve and the one-way exhaust valve. When the reservoir stops feeding the drug, the drug in the reservoir will be maintained at a pressure of 25 kPa. The one-way exhaust valve further ensures that the exhaust pipe can only exhaust in one direction.

[0006] In the above solution: a radar level gauge is provided in the storage tank body for detecting the liquid level of the medicine.

[0007] In the above scheme: the medicine inlet pipe and the water inlet pipe are connected to the top of the storage tank body after merging, the front pump drain pipe and the overflow pipe are connected to the same circulation drain pump, the front pump drain pipe and the overflow pipe are connected to the liquid inlet end of the circulation drain pump after merging, and the liquid outlet end of the circulation drain pump is respectively connected to the return pipe and the rear pump drain pipe. Valves are provided on all pipelines, and a flow switch is provided on the overflow pipe, which is conducive to simplifying the pipeline structure.

[0008] In the above solution: the drug outlet pipe is connected to an online concentration monitoring device of sodium hypochlorite, which is convenient for real-time monitoring of the sodium hypochlorite concentration.

[0009] In the above scheme: the storage tank body is made of concrete lined with polyethylene anchor plates. The special anchoring structure of the V-Lock polyethylene anchor plate is tightly integrated with the solidifiable material to form a stable PE protective layer on the inner surface of the storage tank, which improves the waterproof, anti-corrosion, anti-seepage and crack resistance of the concrete, changes the existing anti-corrosion process of cement products, and has a protective layer with the same lifespan as the building, requiring no maintenance and upkeep. Moreover, the cost of concrete storage tanks is lower than that of HDPE and PE storage tanks, occupies a small area, does not require a factory building, and has good thermal insulation effect (underground or above-ground storage tanks).

[0010] In the above solution: an inspection port is provided on the storage tank body to facilitate the inspection of the interior of the storage tank.

[0011] The beneficial effects of the utility model are as follows: during the storage of sodium hypochlorite, oxygen is continuously generated, the micro-pressure state of the storage tank is conducive to the generated oxygen being retained on the surface of the liquid in the storage tank, and the inhaled fresh gas is adsorbed by CO2, and other gases are lighter than O2, so an oxygen layer is formed on the surface of the sodium hypochlorite liquid. The oxygen layer acts as a stabilizer and can reduce the decomposition rate of sodium hypochlorite. Moreover, since O2 is inhaled into the storage tank, adding a substance in the reverse reaction direction can make the reaction proceed in the opposite direction, which can further inhibit the decomposition of sodium hypochlorite.

[0012] In short, the storage process of the utility model has high stability of the agent, is not prone to decomposition reaction, and effectively reduces the storage loss of sodium hypochlorite. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view of the utility model.

[0014] Figure 2 It is a top view of the present utility model.

[0015] Figure 3 It is a side view of the present utility model. DETAILED DESCRIPTION

[0016] like Figure 1 As shown in FIG3 , an alkali-resistant and strong oxidation-resistant concrete storage tank capable of enhancing the stability of sodium hypochlorite is provided. The main body is a closed storage tank body A, to which a drug inlet pipe 1, a water inlet pipe 2 and a drug outlet pipe 3 are connected.

[0017] The lower end of the storage tank body A is also connected to a pre-pump drain pipe 4, the liquid outlet end of the pre-pump drain pipe 4 is connected to a reflux pipe 6 through a circulating drain pump 5, the liquid outlet end of the reflux pipe 6 is connected to a drug feed pipe 1, and the drug feed end of the drug feed pipe 1 is connected to a dosing pump 7.

[0018] The upper end of the storage tank body A is also connected to an overflow pipe 8, and the liquid outlet end of the overflow pipe 8 is connected to the post-pump emptying pipe 9 through the circulating emptying pump 5.

[0019] The top of the reservoir body A is also connected to an intake pipe 10 and an exhaust pipe 11. The intake pipe 10 is connected to a one-way intake valve 12. The intake end of the one-way intake valve 12 is connected to a CO2 filter 13, which contains soda lime. When the reservoir liquid level drops, air enters the reservoir through the one-way intake valve 12. During this process, the CO2 in the air is adsorbed by the soda lime built into the filter. The principle is: 2NaClO + CO2 + H2O == Na2CO3 + 2HClO. A low-pressure one-way valve 14 is connected to the exhaust pipe 11.

[0020] Preferably, the micro-pressure check valve 14 is a spherical check valve, with a one-way outlet valve 15 connected to the exhaust end of the spherical check valve. The spherical check valve is weighted with 122.5g, which ensures that the reservoir has a pressure of 25 kPa. As the reservoir liquid level begins to rise, the air in the reservoir will be compressed due to the counterweighted check valve at the reservoir outlet. Only when the pressure exceeds 25 kPa will the gas be discharged from the reservoir through the spherical check valve and the one-way exhaust valve 15. When the reservoir stops feeding the medicine, the medicine in the reservoir will be maintained at a pressure of 25 kPa. The one-way outlet valve 15 helps to further ensure that the exhaust pipe can only exhaust in one direction.

[0021] Preferably, a radar level gauge is provided in the storage tank body A for detecting the liquid level of the medicine.

[0022] Preferably, the medicine inlet pipe 1 and the water inlet pipe 2 are connected to the top of the storage tank body A after merging, the front pump drain pipe 4 and the overflow pipe 8 are connected to the same circulation drain pump 5, the front pump drain pipe 4 and the overflow pipe 8 are connected to the liquid inlet end of the circulation drain pump 5 after merging, and the liquid outlet end of the circulation drain pump 5 is respectively connected to the return pipe 6 and the rear pump drain pipe 9. Valves are provided on all pipelines, and a flow switch 16 is provided on the overflow pipe 8, which is conducive to simplifying the pipeline structure.

[0023] Preferably, the drug outlet pipe 3 is connected to an online concentration monitoring device of sodium hypochlorite to facilitate real-time monitoring of the sodium hypochlorite concentration.

[0024] Preferably, the storage tank body A is made of a concrete-lined polyethylene anchor plate 17. The special anchoring structure of the V-Lock polyethylene anchor plate is tightly integrated with the solidifiable material to form a stable PE protective layer on the inner surface of the storage tank, thereby improving the concrete's waterproof, anti-corrosion, anti-seepage, and crack resistance. It changes the existing anti-corrosion process of cement products and provides a protective layer with the same lifespan as the building, requiring no maintenance or upkeep. Moreover, the cost of a concrete storage tank is lower than that of HDPE and PE tanks, occupies a small area, does not require a factory building, and has good thermal insulation effect (underground or above-ground storage tanks).

[0025] Preferably, an inspection port is provided on the tank body A to facilitate inspection of the interior of the tank.

[0026] Instructions for use of this utility model:

[0027] 1. Instructions for storage and use of tank-stabilized reagents

[0028] (1) Turn on the dosing pump 7 and start injecting sodium hypochlorite into the storage tank through the drug inlet pipe 1;

[0029] (2) The dosing personnel (host computer) controls the height of the dosing agent according to the liquid level of the radar level gauge;

[0030] (3) The air in the reservoir is compressed during the process of the medicine entering the reservoir. When the compressed air in the reservoir reaches 0.025 MPa or above, the micro-pressure one-way valve 14 opens, and the air in the reservoir is discharged to the atmosphere through the one-way outlet valve 15;

[0031] (4) When the liquid level of the medicine reaches the highest level in the medicine storage tank, the dosing pump 7 stops working;

[0032] (5) The O2↑ generated by the decomposition reaction of sodium hypochlorite during the storage process is compressed on the surface of the liquid level in the storage tank, forming an O2 protective layer. Under the dual effects of pressure and oxygen-rich layer, the decomposition reaction of sodium hypochlorite in the storage tank is slowed down (2NaClO→2NaCl+O2↑);

[0033] (6) When the valve of the medicine outlet pipe 3 is opened, the liquid level in the medicine storage tank gradually decreases, and the air pressure in the medicine storage tank gradually drops to below atmospheric pressure, fresh air enters the storage tank through the CO2 filter 13 and the one-way air inlet valve 12. CO2, which is heavier than air, is intercepted by the CO2 filter and will not penetrate the oxygen-rich layer and come into contact with sodium hypochlorite, causing the sodium hypochlorite to decompose faster.

[0034] 2. Drug dilution process

[0035] (1) Calculate the required solute level for the required dilution concentration and add the drug to the corresponding level;

[0036] (2) Turn off the dosing pump 7, open the valve of the water inlet pipe 2, and let water in until the solvent reaches the required height;

[0037] (2) Open the valves on the front drain pipe 4, return pipe 6 and drug inlet pipe 1, start the circulation drain pump 5, and mix the drugs. At this time, the valves on the overflow pipe 8 and the rear drain pipe 9 are closed. After mixing, stop the circulation drain pump 5 and close all valves;

[0038] (3) Open the valve on the drug outlet pipe 3. After dilution, the real-time concentration of the diluted drug is transmitted to the host computer through the online concentration monitoring device. The host computer then adjusts the dosage of the drug dosing pump 7 according to the required mass. The storage tank is designed with a water dilution function to prevent salt deposition caused by long-term storage of the drug. Water is also extremely low-cost as a stabilizer.

[0039] 3. Regular emptying function

[0040] Because sodium hypochlorite forms salt deposits during long-term storage, the storage tank needs to be drained regularly to prevent clogging of the dosing pipes. During the draining process, water can be added to dilute the agent when the liquid level reaches a low level. The diluted agent can then be added based on the concentration measured by an online concentration monitoring device. The diluted agent can dissolve the salt deposits.

[0041] 4. Protection against overflow

[0042] If the radar level meter fails during the drug loading process and the drug reaches an ultra-high liquid level, it will overflow through the overflow pipe 8, triggering the flow switch 16, automatically opening the valves of the overflow pipe 8 and the rear emptying pipe 9 of the pump (the two valves are connected to the flow switch 16), starting the circulating emptying pump 5, and discharging the ultra-high liquid level. At the same time, when the flow switch 16 is triggered, an alarm is issued (the flow switch 16 is connected to an alarm), and the dosing pump 7 stops working.

[0043] Effect of anti-corrosion improvement on the stability of sodium hypochlorite:

[0044] 1. Loss of sodium hypochlorite during storage in the laboratory

[0045] According to laboratory test data, the daily attenuation of each temperature is as follows:

[0046] temperature Daily attenuation (%) Daily attenuation (mg / L) 15 0.0282 134.46 18 0.0647 308.49 22 0.0790 376.67 26 0.0982 468.22 28 0.1039 495.40 30 0.1142 544.51 32 0.1195 569.78 35 0.1351 644.16

[0047] This experimental data was obtained by storing sodium hypochlorite in a sealed HDPE container. However, in actual storage, the attenuation of sodium hypochlorite is greater than that obtained in laboratory conditions.

[0048] 2. Loss of sodium hypochlorite in glass fiber reinforced plastic anti-corrosion storage

[0049] Based on the data read by the online concentration detector placed in the sodium hypochlorite dosing room, combined with the sample concentration and storage time when the drug was delivered by the pharmaceutical factory, the actual attenuation rate of sodium hypochlorite during storage can be obtained. Based on the test data in mid-October 2024, the daily attenuation is calculated as follows:

[0050]

[0051] Cause: FRP reacts with sodium hypochlorite, and the reaction rate is increasing. This is because FRP is composed of glass fibers and resin. The outer resin coating uses 191 or 196 unsaturated polyester resin, a polymer compound with ester bonds formed by the polycondensation of unsaturated dibasic acids and unsaturated diols. This resin undergoes redox and addition reactions with sodium hypochlorite. The glass fibers in the inner fiberglass lining are primarily composed of silica, which also reacts chemically with the free alkali in the sodium hypochlorite.

[0052] 3. Storage loss caused by different storage materials under the same temperature environment

[0053] At 28 degrees Celsius, the daily attenuation loss in the laboratory is 495.4 mg / L, and the daily attenuation loss of FRP anti-corrosion is 710.43 mg / L.

[0054] Anti-corrosion problems can cause the decay rate of sodium hypochlorite to increase by 43.4%, so improving anti-corrosion measures is also an important factor in enhancing the storage temperature resistance of sodium hypochlorite.

Claims

1. An alkali-resistant and strong oxidation-resistant concrete storage tank capable of enhancing the stability of sodium hypochlorite, comprising a closed storage tank body (A), characterized in that: The reservoir body (A) is connected to a drug inlet pipe (1), a water inlet pipe (2) and a drug outlet pipe (3). The lower end of the reservoir body (A) is also connected to a pump front emptying pipe (4). The liquid outlet end of the pump front emptying pipe (4) is connected to a reflux pipe (6) through a circulation emptying pump (5). The liquid outlet end of the reflux pipe (6) is connected to the drug inlet pipe (1). The drug inlet end of the drug inlet pipe (1) is connected to a dosing pump (7). The upper end of the reservoir body (A) is also connected to a pump (8). An overflow pipe (8) is connected, and the liquid outlet end of the overflow pipe (8) is connected to the pump rear emptying pipe (9) through a circulating emptying pump (5). The top of the storage tank body (A) is also connected to an air intake pipe (10) and an exhaust pipe (11). The air intake pipe (10) is connected to a one-way air intake valve (12), and the air intake end of the one-way air intake valve (12) is connected to a CO2 filter (13). The exhaust pipe (11) is connected to a micro-pressure one-way valve (14).

2. The alkali-resistant and strong oxidation-resistant concrete storage tank capable of enhancing the stability of sodium hypochlorite according to claim 1, characterized in that: The micro-pressure one-way valve (14) is a spherical one-way valve, and the exhaust end of the spherical one-way valve is connected to a one-way air outlet valve (15).

3. The alkali-resistant and strong oxidation-resistant concrete storage tank capable of enhancing the stability of sodium hypochlorite according to claim 1, characterized in that: A radar level gauge is provided in the storage tank body (A).

4. The alkali-resistant and strong oxidation-resistant concrete storage tank capable of enhancing the stability of sodium hypochlorite according to claim 1, characterized in that: The medicine inlet pipe (1) is connected to the top of the storage tank body (A) after merging with the water inlet pipe (2); the pump front drain pipe (4) and the overflow pipe (8) are connected to the same circulation drain pump (5); the pump front drain pipe (4) and the overflow pipe (8) are connected to the liquid inlet end of the circulation drain pump (5) after merging; the liquid outlet end of the circulation drain pump (5) is connected to the return pipe (6) and the pump rear drain pipe (9) respectively; valves are provided on all pipelines, and a flow switch (16) is provided on the overflow pipe (8).

5. The alkali-resistant and strong oxidation-resistant concrete storage tank capable of enhancing the stability of sodium hypochlorite according to claim 1, characterized in that: The drug outlet pipe (3) is connected to an online concentration monitoring device for sodium hypochlorite.

6. The alkali-resistant and strong oxidation-resistant concrete storage tank capable of enhancing the stability of sodium hypochlorite according to claim 1, characterized in that: The tank body (A) is made of concrete lined with polyethylene anchor plates (17).

7. The alkali-resistant and strong oxidation-resistant concrete storage tank capable of enhancing the stability of sodium hypochlorite according to claim 1, characterized in that: The storage tank body (A) is provided with an inspection port.

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