Hydrochloric acid storage tank emptying absorption device

Abstract

The utility model provides a kind of hydrochloric acid storage tank emptying absorption device, it is related to hydrochloric acid absorption device technical field, it includes absorption tank, absorption tank bottom is equipped with with the absorption pipe that absorption tank top intercommunication, check valve is set up in series on absorption pipe, one-way valve is set up in parallel on the pipeline of check valve side away from absorption tank, gas disperser is fixedly arranged in absorption tank inner bottom, gas disperser bottom is interconnected with absorption pipe, absorption tank top is equipped with balance valve, absorption tank side wall and bottom are respectively interconnected and are equipped with liquid inlet pipe and liquid discharge pipe, by respectively series connection and parallel connection on the check valve and one-way valve of absorption pipe, so that hydrogen chloride in hydrochloric acid storage tank can only be along absorption pipe one-way into absorption tank, release positive pressure;External air can only be along absorption pipe one-way into hydrochloric acid storage tank, balance negative pressure, effectively solved the liquid seal effect of existing structure is susceptible to system pressure fluctuation, and by built-in gas disperser greatly increase gas-liquid contact area, significantly improve absorption efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of hydrochloric acid absorption devices, and in particular to a hydrochloric acid storage tank evacuation absorption device. Background Technology

[0002] Hydrochloric acid in hydrochloric acid storage tanks continuously generates volatile hydrogen chloride gas during daily operation. The generation and elimination of hydrogen chloride can easily cause changes in the pressure inside the hydrochloric acid storage tank, which in turn affects the use of the tank. Specifically, positive pressure is formed inside the tank when feeding, which may lead to seal failure and acid mist leakage; negative pressure is formed when discharging, which may cause the storage tank to collapse and be damaged. In addition, hydrogen chloride has strong corrosiveness and environmental pollution risks, so a special venting and absorption device is required for treatment.

[0003] Existing common venting absorption devices mostly adopt simple water seal or absorption tank structures. Gas is introduced into the water seal tank or tail gas absorption tank or external air is introduced into the hydrochloric acid storage tank by manually switching the venting pipe. The liquid seal principle is used to prevent the gas from escaping directly, and hydrogen chloride gas is dissolved in water to form dilute acid for absorption. However, the liquid seal effect of the existing structure is easily affected by system pressure fluctuations. Especially when the hydrochloric acid storage tank is fed or the temperature rises, causing a sudden increase in positive pressure, the liquid seal may be broken, causing gas to escape. When the discharge or cooling creates a large negative pressure, the liquid seal may be sucked into the storage tank and fail because the venting pipe is not switched in time. At the same time, the contact area between gas and absorption liquid in conventional venting absorption devices is limited, the absorption efficiency is not high, and it is difficult to maintain a stable pressure balance inside and outside the system. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a hydrochloric acid storage tank evacuation and absorption device, which solves the problems of existing technologies where the liquid sealing effect is easily affected by system pressure fluctuations, the absorption efficiency is low, and it is difficult to stably maintain the internal and external pressure balance of the system.

[0005] According to an embodiment of this utility model, a hydrochloric acid storage tank venting absorption device includes an absorption tank, an absorption pipe at the bottom of the absorption tank that communicates with the top of the hydrochloric acid storage tank, a check valve connected in series on the absorption pipe, a one-way valve connected in parallel on the pipe on the side of the check valve away from the absorption tank, a gas disperser fixedly installed at the bottom of the absorption tank, the bottom of the gas disperser communicating with the absorption pipe, a balancing valve at the top of the absorption tank, and an inlet pipe and a drain pipe respectively connected to the side wall and bottom of the absorption tank.

[0006] The technical principle of this invention is as follows: When a positive pressure is formed inside the hydrochloric acid storage tank, hydrogen chloride gas breaks through the seal of the check valve through the absorption pipe and enters the gas disperser. After being dispersed into a large number of fine bubbles, it comes into full contact with the absorbent liquid in the absorption tank and is efficiently absorbed, thus releasing the positive pressure. When a negative pressure is formed inside the storage tank, external air opens the one-way valve under the action of pressure difference and enters the hydrochloric acid storage tank to balance the internal and external pressures and prevent the storage tank from being pumped out. The absorbent liquid in the absorption tank is effectively isolated by the check valve to prevent the absorbent liquid from flowing back into the hydrochloric acid storage tank. The balancing valve can maintain the internal pressure of the absorption tank consistent with the atmospheric pressure to ensure the stability of the system pressure. The inlet pipe and outlet pipe are used to periodically replace the absorbent liquid to ensure absorption efficiency.

[0007] Furthermore, the gas disperser is provided with a gas equalization chamber, the top of which is connected to a number of micropores, and the bottom of which is provided with an air inlet connected to the absorption pipe.

[0008] Furthermore, a gas equalization ring pipe is fixedly installed at the bottom of the absorption tank. The bottom of the gas equalization ring pipe is connected to the absorption pipe. Several air inlets are provided at the bottom of the gas equalization chamber, and the multiple air inlets are respectively connected to the top of the gas equalization ring pipe.

[0009] Furthermore, several baffles are evenly arranged above the gas disperser, which divide the space at the bottom of the tank into several absorption channels.

[0010] Furthermore, the baffle plate has a zigzag cross-section and a plurality of diversion holes are evenly distributed on its surface.

[0011] Furthermore, a circulation pump is fixedly installed on one side of the absorption tank. The inlet and outlet of the circulation pump are connected to the middle and top of the absorption tank, respectively. A spray pipe extends into the tank from the top connection port, and several nozzles are fixedly installed at the bottom of the spray pipe.

[0012] Furthermore, a level gauge and a pressure gauge are fixedly installed on one side of the absorption tank.

[0013] Furthermore, the absorbent liquid used in the absorption tank includes water and alkaline solution.

[0014] Furthermore, a pH meter is fixedly installed on one side of the absorption tank.

[0015] Compared with existing technologies, this utility model has the following advantages: By connecting check valves and one-way valves in series and parallel on the absorption pipe, hydrogen chloride in the hydrochloric acid storage tank can only enter the absorption tank in one direction along the absorption pipe, releasing positive pressure; external air can only enter the hydrochloric acid storage tank in one direction along the absorption pipe, balancing negative pressure. This effectively solves the problem of bidirectional pressure runaway, where gas easily breaks the seal under positive pressure and liquid seal is sucked into the storage tank under negative pressure. Furthermore, the built-in gas disperser greatly increases the gas-liquid contact area, significantly improving absorption efficiency. Combined with the pressure stabilizing effect of the top balance valve, dynamic balance of system pressure and efficient and reliable absorption of harmful gases are achieved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0017] Figure 2 for Figure 1 Enlarged schematic diagram of the structure at point A in the middle.

[0018] Figure 3 This is a half-sectional structural diagram of an embodiment of the present utility model.

[0019] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point B.

[0020] Figure 5 This is a schematic diagram of the gas dispersion disk structure according to an embodiment of the present invention.

[0021] Figure 6 This is a bottom view of the structure of an embodiment of the present invention.

[0022] In the above attached diagram: 1. Absorption tank; 11. Balancing valve; 12. Inlet pipe; 13. Drain pipe; 131. Shut-off valve; 14. Level gauge; 15. Pressure gauge; 16. pH meter; 17. Support leg; 18. Sight glass; 2. Absorption pipe; 21. Check valve; 22. One-way valve; 23. Gas equalization ring pipe; 3. Gas disperser; 31. Gas equalization chamber; 32. Micropore; 33. Air inlet; 4. Baffle plate; 41. Absorption channel; 42. Diverter orifice; 5. Circulation pump; 51. Spray pipe; 52. Spray head; 53. Circulation pipe. Detailed Implementation

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0024] like Figure 1-3As shown in the figure, this utility model embodiment proposes a hydrochloric acid storage tank venting absorption device, which includes an absorption tank 1. A support leg 17 is fixedly installed at the bottom of the absorption tank 1 to provide stable structural support and prevent the tank from tipping over. An absorption pipe 2 is provided at the bottom of the absorption tank 1 and communicates with the top of the hydrochloric acid storage tank. A check valve 21 is connected in series on the absorption pipe 2. A one-way valve 22 is connected in parallel on the absorption pipe 2 on the side of the check valve 2 away from the absorption tank 1. A gas disperser 3 is fixedly installed at the bottom of the absorption tank 1. The bottom of the gas disperser 3 is connected to the absorption pipe 2 and disperses the hydrogen chloride gas entering from the absorption pipe 2 into the absorption liquid. A balance valve 11 is provided at the top of the absorption tank 1 to maintain the pressure balance in the pipe. An inlet pipe 12 and a drain pipe 13 are respectively connected to the side wall and bottom of the absorption tank 1. The inlet pipe 12 is connected to an absorption liquid conveying device (not shown in the figure). A shut-off valve 131 is provided on the drain pipe 13 to facilitate the replenishment and replacement of the absorption liquid and maintain the absorption capacity.

[0025] In this exemplary embodiment, the check valve 21 installed on the absorption pipe 2 includes a fluoropolymer-lined lift-type or swing-type check valve, and the one-way valve 22 includes a fluoropolymer-lined one-way valve. It is worth noting that the valve bodies and flow-through components of both the check valve 21 and the one-way valve 22 must be made of corrosion-resistant materials, such as fluoroplastics like PTFE and FEP. The check valve 21 flows towards the absorption tank 1, allowing hydrogen chloride gas to enter the absorption tank 1 unidirectionally when the hydrochloric acid storage tank is under positive pressure, and effectively preventing the absorbent from flowing back into the hydrochloric acid storage tank. The one-way valve 22 flows towards the absorption pipe 2, allowing external air to be introduced to balance the pressure when the hydrochloric acid storage tank is under negative pressure, while preventing acidic gas from overflowing. The gas disperser 3 is made of a variety of materials. Corrosion-resistant porous materials such as porous ceramics, acid-resistant plastics, or microporous titanium plates can refine the incoming hydrogen chloride gas into tiny bubbles, significantly increasing the gas-liquid contact area and improving absorption efficiency. The balancing valve 11 installed on the top of the absorption tank 1 is preferably a corrosion-resistant breather valve or pressure balancing valve with a PTFE diaphragm, which can automatically adjust the opening by sensing the pressure inside the tank to maintain pressure stability and prevent the risk of overpressure or negative pressure. The conveying pipeline (including the absorption pipe 2 and the connecting pipe inside the tank) in this embodiment is made of engineering plastics such as UPVC, CPVC, or PVDF that are resistant to hydrochloric acid corrosion, as well as corrosion-resistant materials such as steel-lined PE and PP, to ensure long-term stable operation of the device.

[0026] In this embodiment, when positive pressure is formed inside the hydrochloric acid storage tank, hydrogen chloride gas enters the gas disperser 3 through the absorption pipe 2, breaking the seal of the check valve 21. It is dispersed into a large number of fine bubbles and then comes into full contact with the absorbent liquid in the absorption tank 1, where it is efficiently absorbed, releasing the positive pressure. When negative pressure is formed inside the storage tank, external air, under the pressure difference, opens the one-way valve 22 to enter the hydrochloric acid storage tank to balance the internal and external pressures, preventing the tank from collapsing. The absorbent liquid in the absorption tank 1 is effectively isolated by the check valve 21, preventing backflow into the hydrochloric acid storage tank. The balancing valve 11 maintains the internal pressure of the absorption tank 1 consistent with atmospheric pressure, ensuring stable system pressure. The inlet pipe 12 and the outlet pipe... 13 is used to periodically update the absorbent to ensure absorption efficiency. Through check valve 21 and one-way valve 22 connected in series and parallel on the absorption pipe 2 respectively, hydrogen chloride in the hydrochloric acid storage tank can only enter the absorption tank 1 in one direction along the absorption pipe 2 to release positive pressure; external air can only enter the hydrochloric acid storage tank in one direction along the absorption pipe 2 to balance negative pressure. This effectively solves the problem of bidirectional pressure runaway, where gas is easy to break the seal under positive pressure and liquid seal is sucked into the storage tank under negative pressure. In addition, the built-in gas disperser 3 greatly increases the gas-liquid contact area, significantly improving absorption efficiency. Combined with the pressure stabilizing effect of the top balance valve 11, the dynamic balance of system pressure and the efficient and reliable absorption of harmful gases are achieved.

[0027] like Figure 1-5 As shown, in another embodiment, the gas disperser 3 is fixedly arranged in a disc shape at the bottom of the absorption tank 1. The gas disperser 3 has a gas equalization chamber 31 inside, and a number of micropores 32 are connected to the top of the gas equalization chamber 31. An air inlet 33 is provided at the bottom of the gas equalization chamber 31, and the air inlet 33 is connected to the absorption pipe 2. Based on the above configuration, when gas rushes in, the gas equalization chamber 31 first plays an effective role in buffering and stabilizing it. Then, the gas is forced through the numerous micropores 32 provided at its top, is broken into a large number of fine bubbles, and is evenly released into the absorption liquid. This significantly increases the contact area and contact time between the gas and liquid phases, improves the absorption rate and efficiency of hydrogen chloride gas, and avoids the problem of excessively high local concentration of absorption liquid or insufficient absorption and escape caused by concentrated gas release. Since the gas disperser 3 is provided with a large number of micropores 32, it needs to be cleaned and maintained regularly according to actual use to ensure that the channels are unobstructed. The cleaning method is a relatively mature existing technology and will not be described in detail here.

[0028] like Figure 3-6As shown, in another embodiment, the bottom of the absorption tank 1 is further fixedly provided with a gas equalization ring pipe 23, the bottom of which is connected to the absorption pipe 2. The bottom of the gas equalization chamber 31 is provided with a plurality of air inlets 33, which are respectively connected to the top of the gas equalization ring pipe 23. Based on the above configuration, the gas equalization ring pipe 23 forms a primary gas distribution structure, which can perform preliminary pressure equalization and buffering on the hydrogen chloride gas flowing in from the storage tank, effectively preventing the gas from concentrating towards a single inlet in a turbulent manner. The plurality of air inlets 33 at the bottom of the gas equalization chamber 31 are respectively connected to the top of the gas equalization ring pipe 23, so that the gas is smoothly and evenly distributed from the gas equalization ring pipe 23 into the gas equalization chamber 31, realizing secondary gas distribution and further improving the absorption efficiency and stability of hydrogen chloride gas.

[0029] like Figure 3-4 As shown, in another embodiment, several baffles 4 are uniformly arranged above the gas disperser 3. The baffles 4 are fixedly connected to the inner wall of the absorption tank 1, dividing the bottom space of the tank into multiple tortuous upward absorption channels 41. Based on the above arrangement, when the fine bubble group released through the micropores 32 rises, it will be forced to move along the path formed by the baffles 4. Its trajectory is significantly extended and changes direction multiple times. This not only greatly increases the contact and interaction time between the gas and the absorbent liquid, but also promotes the collision, merging and redispersing of the bubbles, making the gas-liquid two-phase mixing more thorough. It effectively prevents the bubbles from merging into large bubbles and escaping through short circuits, ensuring that the hydrogen chloride gas is dissolved and absorbed to the maximum extent, thereby significantly improving the overall absorption efficiency and slowing down the rate at which the absorbent liquid fails due to excessively rapid local reactions.

[0030] like Figure 3-4 As shown, in another embodiment, the baffle plate 4 has a zigzag cross-section and a plurality of diversion holes 42 are uniformly arranged on each plate surface. Based on the above arrangement, the diversion holes 42 uniformly distributed on the baffle plate 4 allow some fluid and bubbles to pass through, avoiding the formation of flow dead zones or gas accumulation on the back of the baffle plate 4, ensuring that the fluid can be uniformly distributed and fully contacted throughout the absorption channel 41, further breaking up large bubbles that may aggregate, and making gas absorption more thorough.

[0031] like Figure 1 and Figure 3As shown, in another embodiment, a circulation pump 5 is fixedly installed on one side of the absorption tank 1. The inlet and outlet of the circulation pump 5 are connected to the middle and top of the absorption tank 1 through a circulation pipe 53. A spray pipe 51 is extended into the tank from the top connection port. Several nozzles 52 are fixedly installed at the bottom of the spray pipe 51. Furthermore, in this embodiment, a sight glass 18 can be installed on the absorption tank 1 according to the actual situation to observe the spraying situation. The spray pipe 51, circulation pipe 53 and nozzles 52 are also made of corrosion-resistant materials. A valve (not shown in the figure) is installed on the circulation pipe 53 to control its opening and closing. Based on the above settings, when the circulation pump 5 is started, it continuously transports the absorbent liquid in the tank to the spray pipe 51 and sprays the absorbent liquid onto the area above the baffle plate 4 through the nozzles 52 to form a droplet curtain, thereby increasing the contact area between the absorbent liquid and the rising gas and enhancing the gas phase mass transfer efficiency.

[0032] like Figure 1 and Figure 3 As shown, in another embodiment, a level gauge 14 and a pressure gauge 15 are fixedly installed on one side of the absorption tank 1. These are used to monitor the liquid level and internal pressure of the absorbent liquid in the tank in real time. The level gauge 14 can intuitively display the real-time storage of the absorbent liquid, which allows the operator to replenish fresh absorbent liquid through the inlet pipe 12 or discharge saturated waste liquid through the drain pipe 13 in a timely manner, thereby maintaining the optimal liquid level environment required for the absorption reaction. The pressure gauge 15 continuously monitors the pressure changes inside the absorption tank 1, providing the operator with direct information on the pressure balance. When the pressure is abnormal, the opening of the balance valve 11 can be adjusted in time or the system sealing can be checked to prevent equipment damage or gas leakage due to excessively high or low pressure.

[0033] like Figure 1 and Figure 3 As shown, in another embodiment, the absorbent used in the absorption tank 1 further includes water and alkaline solution, and a pH meter 16 is fixedly installed on one side of the absorption tank 1 to monitor the changes in acidity and alkalinity in the absorbent in real time. The pH meter 16 can accurately reflect the degree of absorption of hydrogen chloride gas by the absorbent. By setting an absorption threshold, when the pH value drops below the threshold, it indicates that the acidity of the absorbent is increasing and the absorption efficiency is decreasing. This can promptly remind the operator to replenish or replace the absorbent to restore its absorption capacity, thereby ensuring that the absorption effect is always in the best state. This effectively prevents the risk of substandard tail gas treatment and hydrogen chloride gas escape caused by absorbent saturation, while avoiding waste caused by excessive liquid addition, and achieving precision and economy in process control.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A hydrochloric acid storage tank evacuation and absorption device, characterized in that: The system includes an absorption tank (1), an absorption pipe (2) connected to the top of a hydrochloric acid storage tank at the bottom of the absorption tank (1), a check valve (21) connected in series on the absorption pipe (2), a one-way valve (22) connected in parallel on the pipe on the side of the check valve (21) away from the absorption tank (1), a gas disperser (3) fixedly installed at the bottom of the absorption tank (1), the bottom of the gas disperser (3) connected to the absorption pipe (2), a balance valve (11) installed at the top of the absorption tank (1), and an inlet pipe (12) and a drain pipe (13) connected to the side wall and bottom of the absorption tank (1), respectively.

2. The hydrochloric acid storage tank evacuation absorption device as described in claim 1, characterized in that: The gas disperser (3) is provided with a gas equalization chamber (31), the top of the gas equalization chamber (31) is connected to a number of micropores (32), the bottom of the gas equalization chamber (31) is provided with an air inlet (33), and the air inlet (33) is connected to the absorption tube (2).

3. The hydrochloric acid storage tank evacuation absorption device as described in claim 2, characterized in that: The bottom of the absorption tank (1) is also fixedly provided with a gas equalization ring pipe (23), the bottom of the gas equalization ring pipe (23) is connected to the absorption pipe (2), and the bottom of the gas equalization chamber (31) is provided with a number of air inlets (33), and the multiple air inlets (33) are respectively connected to the top of the gas equalization ring pipe (23).

4. The hydrochloric acid storage tank evacuation absorption device as described in claim 1, characterized in that: Several baffles (4) are evenly arranged above the gas disperser (3), and the baffles (4) divide the bottom space of the tank into several absorption channels (41).

5. The hydrochloric acid storage tank evacuation absorption device as described in claim 4, characterized in that: The baffle plate (4) has a broken cross section and a number of diversion holes (42) are evenly distributed on the plate surface.

6. The hydrochloric acid storage tank evacuation absorption device as described in claim 1, characterized in that: A circulation pump (5) is fixedly installed on one side of the absorption tank (1). The inlet and outlet of the circulation pump (5) are connected to the middle and top of the absorption tank (1) respectively. A spray pipe (51) is installed at the top connection port extending into the tank. Several nozzles (52) are fixedly installed at the bottom of the spray pipe (51).

7. The hydrochloric acid storage tank evacuation absorption device as described in claim 1, characterized in that: A level gauge (14) and a pressure gauge (15) are fixedly installed on one side of the absorption tank (1).

8. The hydrochloric acid storage tank evacuation absorption device as described in claim 1, characterized in that: The absorption tank (1) uses an absorption liquid consisting of water and an alkaline solution.

9. The hydrochloric acid storage tank evacuation absorption device as described in claim 8, characterized in that: A pH meter (16) is fixedly installed on one side of the absorption tank (1).

Images