A hydrochloric acid storage tank

Abstract

The utility model provides a kind of hydrochloric acid storage tank, including hydrochloric acid tank body and lye circulating system, the upper portion of hydrochloric acid tank body inner chamber is provided with the spray chamber separated from the hydrochloric acid in hydrochloric acid tank body, the side wall of the spray chamber is provided with the gas passage for the hydrochloric acid mist to enter spray chamber, the top of the spray chamber is provided with the spray layer nozzle that can spray lye, the connection of the spray layer nozzle inlet of the spray chamber and lye circulating system, the bottom of the spray chamber is provided with liquid outlet, the liquid outlet of the spray chamber is connected with the input port of lye circulating system, lye circulating system further includes pH meter and lye replenishing device, lye replenishing device is connected with the input port of lye circulating system, control valve is arranged on the connecting pipeline between lye replenishing device and the input port of lye circulating system, the pH meter and control valve signal connection.It can efficiently purify acid mist, while automatically balancing pressure inside and outside tank, ensure storage tank safety, realize the unity of environmental protection and safety.

Description

Technical Field

[0001] This utility model relates to the field of storage tank technology, specifically to a hydrochloric acid storage tank. Background Technology

[0002] Hydrochloric acid, as an important industrial raw material, is widely used in water treatment, chemical production, steel pickling, and other industrial fields. Industrial hydrochloric acid is usually stored in vertical or horizontal tanks. Due to its high volatility, large amounts of hydrogen chloride (HCl) gas are easily released from the tanks during changes in ambient temperature or liquid level fluctuations, forming highly corrosive acid mist.

[0003] Currently, there are several main methods for treating acid mist in hydrochloric acid storage tanks: First, direct emission into the atmosphere, with the tank's vent directly exposed to the external environment. While simple to operate, the emitted hydrogen chloride mist can severely corrode surrounding equipment, steel structures, and buildings, endangering human health and clearly violating environmental protection regulations. Second, using a completely sealed tank system. This method prevents acid mist from escaping, but the internal pressure of the hydrochloric acid tank rises sharply when feeding or when the ambient temperature increases, posing a risk of "pressure buildup" or even tank explosion. Conversely, a large negative pressure may form when discharging or when the temperature drops, leading to tank collapse and deformation. Third, installing a simple water seal device. This method can alleviate pressure fluctuations and absorb some acid mist to a certain extent, but it still suffers from low absorption efficiency, easy saturation, and residual acid mist in the exhaust gas. Furthermore, the water seal fluid needs frequent replacement, increasing operating and maintenance costs and generating new acid-containing waste liquid, leading to secondary pollution. All existing methods for treating acid mist from hydrochloric acid storage tanks have significant shortcomings, failing to balance safety, environmental friendliness, and ease of operation and maintenance. Therefore, there is an urgent need to develop an acid mist absorption and treatment device that can efficiently treat hydrogen chloride acid mist, achieve safe pressure balance in storage tanks, and is easy to maintain.

[0004] Therefore, existing technologies need further development. Utility Model Content

[0005] This utility model provides a hydrochloric acid storage tank, the specific implementation of which is as follows: A hydrochloric acid storage tank includes a hydrochloric acid tank body and an alkaline circulation system. A spray chamber, separated from the hydrochloric acid inside the tank body, is located in the upper part of the tank body. An air vent is provided on the side wall of the spray chamber to allow hydrochloric acid mist to enter. A spray nozzle for spraying alkaline solution is located at the top of the spray chamber. The inlet of the spray nozzle is connected to the outlet of the alkaline circulation system. A liquid outlet is located at the bottom of the spray chamber and is connected to the inlet of the alkaline circulation system. The alkaline circulation system also includes a pH meter and an alkaline replenishment device. The alkaline replenishment device is connected to the inlet of the alkaline circulation system. A control valve is installed on the connecting pipeline between the alkaline replenishment device and the inlet of the alkaline circulation system. The pH meter and the control valve are signal-connected.

[0006] Furthermore, a self-operated suction valve is installed on the top of the hydrochloric acid tank.

[0007] Furthermore, a baffle is vertically installed in the spray chamber corresponding to the air outlet.

[0008] Furthermore, the partition is fixed to the top of the spray chamber, and there is a gap between the bottom of the partition and the bottom of the spray chamber.

[0009] Furthermore, an overflow port is provided on the side wall of the hydrochloric acid tank, and the height of the overflow port is lower than the height of the vent port.

[0010] Furthermore, a level gauge is connected to the bottom side of the hydrochloric acid tank, and a level gauge valve is installed on the level gauge.

[0011] Furthermore, the top of the spray chamber is equipped with multiple spray nozzles capable of spraying alkaline solution.

[0012] Furthermore, a circulation pump is installed on the connecting pipeline between the spray layer nozzle inlet of the spray chamber and the output port of the alkali circulation system.

[0013] Beneficial effects: 1. In this utility model, the acid mist inside the hydrochloric acid tank enters the spray chamber and comes into contact with the alkaline solution, thus completely absorbing the acid mist. Furthermore, an alkaline solution circulation system is adopted, in which the alkaline solution can be recycled. Only a small amount of alkaline solution needs to be added when the pH value is lower than a certain threshold, resulting in low consumables and low operating costs.

[0014] 2. The alkali replenishment device is equipped with a pH meter, which is connected to the control valve. When the pH meter detects that the pH in the alkali replenishment device is lower than a certain threshold, the control valve is adjusted to automatically replenish the alkali. This utility model has a high degree of automation and is easy to maintain. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the hydrochloric acid storage tank used in an embodiment of this utility model; The above figures include the following reference numerals: 1. Hydrochloric acid tank; 11. Self-operated suction valve; 12. Hydrochloric acid level gauge; 13. Overflow port; 14. Drain port; 2. Spray chamber; 21. Air outlet; 22. Spray layer nozzles; 23. Baffle; 3. Alkali replenishment device; 31. Alkali level gauge; 32. Drain port; 4. pH meter; 5. Control valve; 6. Circulation pump; 7. Alkali storage tank. Detailed Implementation

[0016] The specific embodiments of this utility model are described below with reference to the accompanying drawings and examples: It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0017] Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0018] According to an embodiment of this utility model, a hydrochloric acid storage tank is provided. Please refer to [link / reference]. Figure 1The system includes: a hydrochloric acid tank 1 and an alkali circulation system. The upper part of the inner cavity of the hydrochloric acid tank 1 is provided with a spray chamber 2, separated from the hydrochloric acid inside the tank 1. The side wall of the spray chamber 2 is provided with an air outlet 21 for hydrochloric acid mist to enter the spray chamber 2. The top of the spray chamber 2 is provided with a spray layer nozzle 22 capable of spraying alkali solution. The inlet of the spray layer nozzle 22 is connected to the outlet of the alkali circulation system. The bottom of the spray chamber 2 is provided with a liquid outlet, which is connected to the inlet of the alkali circulation system. The alkali circulation system also includes a pH meter 4 and an alkali replenishment device 3. The alkali replenishment device 3 is connected to the inlet of the alkali circulation system. A control valve 5 is provided on the connecting pipe between the alkali replenishment device 3 and the inlet of the alkali circulation system. The pH meter 4 and the control valve 5 are signal-connected. Gas inside the tank enters the spray chamber 2 through the vent 21. The spray chamber 2 is installed inside the hydrochloric acid tank 1 and sprays alkaline solution downwards, forming a dense water mist curtain that directly reacts with the acid mist. The remaining alkaline solution is recycled to the alkaline solution replenishment device 3. The alkaline solution circulation system provides circulating alkaline solution (such as sodium hydroxide solution) to the spray chamber 2 and detects the pH value in the alkaline solution replenishment device 3 through a pH meter 4. If the detected pH is lower than a certain threshold, the control valve 5 is automatically opened under signal control, allowing the alkaline solution storage tank 7 to replenish the alkaline solution circulation system and maintain absorption efficiency.

[0019] The hydrochloric acid tank 1 is equipped with a self-operated suction valve 11 on its top. The self-operated suction valve 11 is installed on the hydrochloric acid tank 1 and automatically opens when the pressure inside the tank drops abnormally, absorbing air from the outside to balance the pressure.

[0020] A baffle 23 is vertically installed in the spray chamber corresponding to the air outlet 21, between the air outlet 21 and the spray nozzle 22. The baffle 23 is fixed to the top of the spray chamber 2, and there is a gap between the bottom of the baffle 23 and the bottom of the spray chamber 2. The baffle 23 allows the gas phase to enter from the bottom gap, and at the same time prevents the spray liquid from mixing with hydrochloric acid and causing hydrochloric acid contamination.

[0021] An overflow port 13 is provided on the side wall of the hydrochloric acid tank 1. The height of the overflow port 13 is lower than the height of the vent port 21. The lower height of the overflow port 13 compared to the vent port 21 that connects to the spray chamber 2 ensures that if too much hydrochloric acid is added to the hydrochloric acid tank 1, it will flow out through the overflow port 13, preventing excessive hydrochloric acid from entering the spray chamber 2 through the vent port 21.

[0022] A hydrochloric acid level gauge 12 is connected to the bottom side of the hydrochloric acid tank 1, and a valve is installed on the level gauge 12. The level gauge 12 allows observation of the amount of hydrochloric acid inside the tank 1. The valve can be immediately closed when the level gauge needs maintenance, replacement, or if a leak occurs, completely isolating the level gauge from the hydrochloric acid inside the tank. This avoids high-risk operations under pressure and liquid conditions, fundamentally eliminating the risk of large-scale hydrochloric acid leakage during maintenance, and greatly ensuring the safety of operators and the surrounding environment. A drain port 14 is also provided below the level gauge 12. The drain port 14 is controlled by a valve to guide the discharged material to a dedicated collection device or neutralization treatment system, avoiding accidental splashing or evaporation of hydrochloric acid that might occur if other interfaces are opened to clean sediment, effectively protecting operator safety and preventing environmental pollution.

[0023] The top of the spray chamber 2 is equipped with multiple spray nozzles 22 capable of spraying alkaline solution. The multiple spray nozzles 22 increase the gas-liquid contact interface, ensuring efficient and thorough purification of acid mist.

[0024] A circulation pump 6 is installed on the connecting pipeline between the inlet of the spray nozzle 22 of the spray chamber 2 and the outlet of the alkali circulation system. The circulation pump 6 provides power to the entire alkali circulation system, enabling the alkali to form a closed-loop circulation between the spray chamber 2 and the alkali replenishment device 3.

[0025] The alkali replenishment device 3 also includes an alkali level gauge 31 and a drain outlet 32. The alkali solution in the replenishment device will form high-salt wastewater which will be discharged. The alkali level gauge 31 facilitates the observation of the replenishment and drainage progress. The drain outlet 32 ​​is used to empty the high-salt wastewater from the alkali replenishment device 3.

[0026] The specific process of this utility model is as follows: Acid mist rises from hydrochloric acid tank 1, increasing the internal pressure. The acid mist enters spray chamber 2 through vent 21. Spray chamber 2 is equipped with multiple spray nozzles 22. Alkali solution is sprayed into spray chamber 2 from alkali solution replenishment device 3 via circulation pump 6. An acid-base neutralization reaction occurs in spray chamber 2, absorbing the acid mist. Unreacted alkali solution is recycled into alkali solution replenishment device 3, forming a closed loop. Alkali solution replenishment device 3 is also equipped with a pH meter 4, which detects the pH within the device. If the detected pH is less than 10, control valve 5 is automatically activated by a signal to replenish alkali solution in alkali storage tank 7 to the alkali solution circulation system. Alkali solution replenishment device 3 also includes an alkali solution level gauge 31 and a drain port 32. The level in alkali solution replenishment device 3 is observed through the level gauge 31. When the level is too high, the drain port 32 discharges the alkali solution from replenishment device 3 into a dedicated collection device. A self-operated suction valve 11 is installed on the top of hydrochloric acid tank 1. The self-operated suction valve 11 is installed on the hydrochloric acid tank 1 and is the core component that ensures the safety of the hydrochloric acid tank 1. It automatically opens when the pressure inside the tank decreases to balance the pressure.

[0027] Many other changes and modifications can be made without departing from the concept and scope of this utility model. It should be understood that this utility model is not limited to the specific embodiments, and the scope of this utility model is defined by the appended claims.

Claims

1. A hydrochloric acid storage tank, characterized in that, The system includes a hydrochloric acid tank and an alkali circulation system. The upper part of the hydrochloric acid tank's inner cavity is equipped with a spray chamber, separated from the hydrochloric acid inside the tank. The side wall of the spray chamber has an air vent for hydrochloric acid mist to enter. The top of the spray chamber is equipped with spray nozzles for spraying alkali solution. The inlet of the spray nozzles is connected to the outlet of the alkali circulation system. The bottom of the spray chamber has a liquid outlet, which is connected to the inlet of the alkali circulation system. The alkali circulation system also includes a pH meter and an alkali replenishment device. The alkali replenishment device is connected to the inlet of the alkali circulation system. A control valve is installed on the connecting pipeline between the alkali replenishment device and the inlet of the alkali circulation system. The pH meter and the control valve are signal-connected.

2. The hydrochloric acid storage tank according to claim 1, characterized in that, The hydrochloric acid tank is equipped with a self-operated suction valve at the top.

3. A hydrochloric acid storage tank according to claim 1, characterized in that, The spray chamber is equipped with a vertical baffle corresponding to the air outlet.

4. A hydrochloric acid storage tank according to claim 3, characterized in that, The partition is fixed to the top of the spray chamber, and there is a gap between the bottom of the partition and the bottom of the spray chamber.

5. A hydrochloric acid storage tank according to claim 1, characterized in that, An overflow port is provided on the side wall of the hydrochloric acid tank, and the height of the overflow port is lower than the height of the vent.

6. A hydrochloric acid storage tank according to claim 1, characterized in that, A hydrochloric acid level gauge is also connected to the bottom side of the hydrochloric acid tank, and a level gauge valve is installed on the level gauge.

7. A hydrochloric acid storage tank according to claim 1, characterized in that, The top of the spray chamber is equipped with multiple spray nozzles capable of spraying alkaline solution.

8. A hydrochloric acid storage tank according to claim 1, characterized in that, A circulation pump is installed on the connecting pipeline between the inlet of the spray layer nozzles in the spray chamber and the outlet of the alkali circulation system.

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