Liquid hydrogen chloride steel cylinder tail gas absorption device
By designing a liquid hydrogen chloride cylinder tail gas absorption device, and utilizing the synergistic effect of equipment such as a falling film absorber and an acid circulation tank, the problem of incomplete treatment of liquid hydrogen chloride cylinder filling tail gas was solved, achieving efficient absorption and stable operation, and reducing equipment corrosion and environmental pollution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG ALUMINUM WORKS
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-05
AI Technical Summary
During the filling process of liquid hydrogen chloride cylinders, the exhaust gas is directly introduced into the purging system, which can cause blockage of the purging tower, interference of hydrogen chloride gas with the reaction, and affect product quality and equipment life. High temperatures in summer can lead to unstable vaporization and pressure, affecting filling efficiency and equipment safety.
By employing the synergistic effect of equipment such as falling film absorbers, acid circulation tanks, and hydraulic jet pumps, and through the design of the absorption zone and the outlet zone, as well as the arrangement of tubes, full contact between hydrogen chloride gas and absorption water is achieved. Furthermore, the thermal expansion and contraction of the pipeline is compensated by buffer tanks, pressure limiting orifice plates, and corrugated expansion joints, thereby controlling the uniform distribution of system pressure and airflow.
It improved the hydrogen chloride absorption efficiency, stabilized the acid concentration, reduced equipment corrosion and pollution, extended equipment life, reduced labor intensity and enterprise maintenance costs, and ensured the stable operation of the system.
Smart Images
Figure CN224194425U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of exhaust gas absorption technology, specifically to an exhaust gas absorption device for liquid hydrogen chloride cylinders. Background Technology
[0002] Numerous problems arise during the filling of liquid hydrogen chloride cylinders in the workshop. For instance, directly introducing the filling exhaust gas into the chlorination system causes hydrogen chloride to react with caustic soda to produce sodium chloride, which easily leads to salt buildup and blockage at the inlet and internal packing rings of the chlorination tower. This reduces the extraction pressure of the chlorination system, affecting the overall exhaust gas operation of chlor-alkali production, requiring frequent unblocking by staff, resulting in high labor intensity. Furthermore, hydrogen chloride gas entering the chlorination system interferes with the reaction between chlorine and caustic soda, causing fluctuations in the quality of sodium hypochlorite. In addition, during hot summer months, hydrogen chloride vaporization is severe, affecting filling efficiency, and large amounts of hydrogen chloride gas entering the exhaust pipes can damage the titanium blower at the top of the chlorination tower.
[0003] Existing equipment still has the problem of incomplete treatment. Gaseous hydrogen chloride can easily enter the acid absorption tank, which not only reduces the absorption efficiency but may also lead to unstable acid concentration in the tank, affecting the quality of subsequent products and even causing equipment corrosion, shortening equipment lifespan, and increasing enterprise maintenance costs and safety risks. Moreover, high temperatures in summer cause a large amount of hydrogen chloride to vaporize. Traditional equipment directly introduces the tail gas into the treatment system, which can easily cause unstable system pressure due to a sudden increase in gas flow, thus affecting the normal operation of the tail gas absorption device. At the same time, the instantaneous vaporization of hydrogen chloride absorbs heat, causing a sudden drop in pipeline temperature, which triggers thermal expansion and contraction stress in the pipeline and affects its service life. Utility Model Content
[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a liquid hydrogen chloride cylinder tail gas absorption device. Through the synergistic action of a falling film absorber, an acid circulation tank, and a hydraulic jet pump, it achieves highly efficient absorption of hydrogen chloride cylinder tail gas. The design of the absorption and outlet zones within the falling film absorber, along with the arrangement of the tubular components, ensures full contact between the hydrogen chloride gas and the absorption water, significantly improving absorption efficiency, effectively reducing the hydrogen chloride content in the tail gas, and minimizing environmental pollution.
[0005] This utility model is achieved using the following technical solution:
[0006] The liquid hydrogen chloride cylinder tail gas absorption device includes a falling film absorber and a buffer tank. The buffer tank is connected to the falling film absorber through an inlet pipe. The falling film absorber is connected to the acid circulation tank through a U-shaped bend. The falling film absorber has an absorption zone and an outlet zone inside. The acid circulation tank is connected to the absorption zone through a pipe. A hydraulic jet pump is installed above the acid circulation tank. The outlet zone is connected to the hydraulic jet pump through a connecting pipe.
[0007] The layout of the absorption and outlet zones, along with the arrangement of the tubing, ensures sufficient contact between hydrogen chloride gas and the absorption water, improving absorption efficiency. Circulating cooling water pipes are used for cooling, ensuring the absorption process operates at a suitable temperature. U-bends act as liquid seals, preventing backflow from the jet pump into the falling film absorber and ensuring the system pressure does not exceed 5 kPa. Sight glasses facilitate observation of the acid flow in the falling film absorber, allowing for timely detection of any abnormalities.
[0008] The absorption zone is located above the liquid outlet zone, and a tube array is provided between the absorption zone and the liquid outlet zone.
[0009] The absorption zone is connected to the inlet pipe of the falling film absorber, and the outer side of the tube is connected to the inlet pipe and outlet pipe of the circulating cooling water.
[0010] A liquid outlet pipe is provided between the liquid outlet area and the U-shaped bend, and a sight glass is provided on the liquid outlet pipe. An inlet pipe is connected between the liquid outlet pipe and the U-shaped bend.
[0011] The U-shaped bend is connected to the acid circulation tank via an inlet pipe, and a water inlet is located above the acid circulation tank.
[0012] The acid circulation tank is connected to the hydraulic jet pump via an acid circulation pump. A circulation pipe is provided between the acid circulation pump and the hydraulic jet pump, and the circulation pipe is connected to the absorption zone via an absorption water pipe.
[0013] The buffer tank is connected to an inlet pipe, which is equipped with a pressure limiting orifice plate and a first-stage corrugated expansion joint. The interior of the buffer tank is equipped with a perforated flow divider.
[0014] The inlet pipe to the falling film absorber is equipped with a two-stage corrugated expansion joint, and a stainless steel wire mesh layer is provided at the connection between the inlet pipe and the falling film absorber. The wall thickness of the inlet pipe to the buffer tank, the inlet pipe to the falling film absorber, and the inlet pipe to the U-bend are all 6-8mm.
[0015] The buffer tank is located between the gas cylinder tail gas outlet and the falling film absorber, and is connected via an inlet pipe. It is designed with a volume of 1~2 m³, capable of storing peak flow gas and mitigating instantaneous pressure surges (during peak summer flow, the buffer tank can absorb 20%~30% of excess gas).
[0016] The pressure limiting orifice plate is installed on the inlet pipe (21) of the buffer tank, about 1 meter before the inlet of the buffer tank. The orifice diameter is calculated based on the maximum flow rate (DN80 pipe, orifice diameter about 40mm), limiting the gas flow velocity to ≤15m / s and controlling the pressure fluctuation range within ±1kPa.
[0017] The primary corrugated expansion joint compensates for the shrinkage deformation (approximately 0.03%~0.05%) of the pipeline entering the buffer tank due to temperature changes (from ambient temperature 25℃ to gas temperature -5℃), preventing pipeline cracking.
[0018] The porous flow divider plate has uniformly distributed Φ8mm holes (opening ratio 30%~40%), which disperses the high-speed airflow (20m / s) into low-speed uniform airflow (5~8m / s), reducing turbulence intensity and improving the pressure stability of the buffer tank.
[0019] The stainless steel wire mesh layer uses 304 stainless steel wire mesh (20 mesh, 0.85mm aperture), with two layers spaced 150mm apart and arranged in an alternating pattern. Further refining the airflow (reducing the flow rate to 3-5m / s) ensures that hydrogen chloride gas is evenly distributed across the cross-section of the absorption zone, increasing the gas-liquid contact area by 50% and raising the absorption efficiency to over 90%.
[0020] The secondary corrugated expansion joint compensates for the thermal expansion and contraction of the pipeline caused by temperature changes in the absorption zone (the circulating cooling water maintains the temperature on the outside of the tube at 15~20℃). It allows for axial displacement of ±10mm and lateral displacement of ±5mm, preventing leakage due to stress concentration at the connection between the pipeline and the absorber.
[0021] The working principle of this utility model is as follows:
[0022] Move the liquid hydrogen chloride cylinder onto the scale, connect the filling pipe (rigid connection), open the cylinder valve, and open the evacuation valve to evacuate for a moment before closing it, ready for filling. Slowly open the manual filling valve, and the automatic filling valve will open under the control of the automatic filling program to begin filling. During filling, listen carefully to the sounds inside the cylinder and check the cylinder seal and wall temperature frequently, addressing any abnormalities promptly. After filling, open the evacuation valve to remove any remaining liquid hydrogen chloride from the pipeline. The tail gas (DN80) from the filled hydrogen chloride cylinder passes through the pipeline's explosion-proof membrane and enters the buffer tank via a reducer (DN80 / 300). A pressure limiting orifice plate restricts the peak gas flow, a primary corrugated expansion joint compensates for pipeline contraction, and a porous flow divider evenly distributes the gas flow into the buffer tank. The buffered gas then enters the falling film absorber via the inlet pipe. At the top of the falling film absorber, it comes into contact with the absorbent water and flows downstream, mixing and being absorbed within the absorber. The absorbed hydrogen chloride gas enters the inlet of the hydraulic jet pump through a reducer (DN100 / 40), and then enters the acid circulation tank via the hydraulic jet pump (pumping capacity 60 m³ / h). The acid water at the bottom of the falling film absorber enters the side opening of the acid circulation tank after passing through a U-shaped liquid seal.
[0023] Compared with the prior art, the beneficial effects of this utility model are:
[0024] (1) This device achieves efficient absorption of hydrogen chloride cylinder tail gas through the synergistic effect of falling film absorber, acid circulation tank, hydraulic jet pump and other equipment. The design of the absorption zone and liquid outlet zone in the falling film absorber, as well as the arrangement of the tubes, ensures that the hydrogen chloride gas and the absorption water are in full contact, which greatly improves the absorption efficiency, effectively reduces the hydrogen chloride content in the tail gas and reduces the pollution to the environment.
[0025] (2) This device effectively prevents gaseous hydrogen chloride from entering the acid absorption tank through the liquid outlet pipe between the liquid outlet area and the U-shaped bend, as well as the liquid seal effect of the U-shaped bend. This ensures the stability of the acid concentration in the acid circulation tank, improves the absorption effect, reduces corrosion of equipment such as the acid circulation tank, extends the service life of the equipment, and reduces the equipment maintenance cost for enterprises.
[0026] (3) The buffer tank and the pressure limiting orifice plate work together to avoid the interruption of absorption due to unstable pressure. The porous flow divider and the stainless steel wire mesh layer achieve uniform gas distribution. The first-level / second-level corrugated expansion joint effectively compensates for the thermal expansion and contraction stress of the pipeline and reduces the risk of pipeline leakage. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the structure of the liquid hydrogen chloride cylinder tail gas absorption device of this utility model;
[0028] In the diagram: 1. Falling film absorber; 2. Acid circulation tank; 3. Hydraulic jet pump; 4. Discharge pipe; 5. Sight glass; 6. U-bend; 7. Acid circulation pump; 8. Inlet pipe to falling film absorber; 9. Inlet pipe for circulating cooling water; 10. Outlet pipe for circulating cooling water; 11. Inlet pipe for U-bend; 12. Inlet pipe for acid circulation tank; 13. Circulation pipe; 14. Absorption water pipe; 15. Connecting pipe; 16. Absorption zone; 17. Discharge zone; 18. Tube set; 19. Water inlet; 20. Buffer tank; 21. Inlet pipe for buffer tank; 22. Pressure limiting orifice plate; 23. Primary corrugated expansion joint; 24. Secondary corrugated expansion joint; 25. Perforated flow divider; 26. Stainless steel wire mesh layer. Detailed Implementation
[0029] To make the objectives and technical solutions of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.
[0030] Example 1
[0031] like Figure 1As shown, the liquid hydrogen chloride cylinder tail gas absorption device includes a falling film absorber 1 and a buffer tank 20. The buffer tank 20 is connected to the falling film absorber 1 via an inlet pipe 8. The falling film absorber 1 is connected to the acid circulation tank 2 via a U-shaped bend 6. The falling film absorber 1 has an absorption zone 16 and an outlet zone 17 inside. The acid circulation tank 2 is connected to the absorption zone 16 via a pipe. A hydraulic jet pump 3 is installed above the acid circulation tank 2. The outlet zone 17 is connected to the hydraulic jet pump 3 via a connecting pipe 15. The absorption zone 16 is located above the outlet zone 17, and a tube array 18 is provided between the absorption zone 16 and the outlet zone 17. The layout of the absorption zone 16 and the outlet zone 17, as well as the arrangement of the tube array 18, ensures that the hydrogen chloride gas and the absorption water are in full contact, improving the absorption efficiency. The absorption zone 16 is connected to the inlet pipe 8 of the falling film absorber, and the outer side of the tube array 18 is connected to a circulating cooling water inlet pipe 9 and a circulating cooling water outlet pipe 10. A liquid outlet pipe 4 is installed between the liquid outlet area 17 and the U-shaped bend 6. A sight glass 5 is installed on the liquid outlet pipe 4. An inlet pipe 11 connects the liquid outlet pipe 4 to the U-shaped bend 6. An inlet pipe 12 connects the U-shaped bend 6 to the acid circulation tank 2. A water inlet 19 is located above the acid circulation tank 2. The acid circulation tank 2 provides circulating absorbent for the absorption process. The water inlet 19 replenishes the absorbent water, maintaining a stable concentration and level of the absorbent. The pipe connections to various devices enable the recycling of the absorbent, improving absorption efficiency. A circulating cooling water pipe is used for cooling, ensuring the absorption process operates at a suitable temperature. The U-shaped bend acts as a liquid seal, preventing backflow from the jet pump into the falling film absorber and ensuring the system pressure does not exceed 5 kPa. The sight glass 5 facilitates observation of the acid flow in the falling film absorber, allowing for timely detection of abnormalities. The acid circulation tank 2 is connected to the hydraulic jet pump 3 via the acid circulation pump 7. A circulation pipe 13 is provided between the acid circulation pump 7 and the hydraulic jet pump 3. The circulation pipe 13 is connected to the absorption zone 16 via the absorption water pipe 14. The buffer tank 20 is connected to the buffer tank inlet pipe 21. The buffer tank inlet pipe 21 is equipped with a pressure limiting orifice plate 22 and a primary corrugated expansion joint 23. The interior of the buffer tank 20 is equipped with a porous flow divider plate 25. The falling film absorber inlet pipe 8 is equipped with a secondary corrugated expansion joint 24. A stainless steel wire mesh layer 26 is provided at the connection between the falling film absorber inlet pipe 8 and the falling film absorber 1.
[0032] The above-mentioned liquid hydrogen chloride cylinder tail gas absorption device includes the following steps during operation:
[0033] (1) Move the liquid hydrogen chloride cylinder onto the scale, connect the filling pipe, open the cylinder valve, open the evacuation valve to evacuate for a moment and then close it to prepare for filling; slowly open the manual filling valve, and the automatic filling valve will open under the control of the automatic filling program to carry out filling. Pay attention to the sound inside the cylinder during filling, and check the cylinder seal and cylinder wall temperature at any time. If any abnormality occurs, deal with it in time. (2) After filling is completed, open the evacuation valve. The cylinder exhaust gas passes through the explosion-proof membrane and the diameter change, and then enters the buffer tank 20 through the buffer tank inlet pipe 21. The pressure limiting orifice plate 22 limits the peak gas flow rate, the first-stage corrugated expansion joint 23 compensates for pipeline contraction, and the porous diverter plate 25 evenly disperses the gas flow into the buffer tank 20. The buffered gas enters the falling film absorber 1 through the falling film absorber pipe 8, and then mixes with the liquid phase in the absorption water pipe 14. It then enters the acid circulation tank 2 through the U-shaped bend 6. The hydraulic jet pump 3 is used to maintain the pumping force on the falling film absorber 1. The liquid phase in the acid circulation tank 2 enters the falling film absorber 1 through the absorption water pipe 14.
Claims
1. A device for absorbing the tail gas from a liquid hydrogen chloride cylinder, characterized in that, It includes a falling film absorber (1) and a buffer tank (20). The buffer tank (20) is connected to the falling film absorber (1) through the falling film absorber pipe (8). The falling film absorber (1) is connected to the acid circulation tank (2) through the U-shaped bend pipe (6). The falling film absorber (1) has an absorption zone (16) and an outlet zone (17) inside. The acid circulation tank (2) is connected to the absorption zone (16) through a pipe. A hydraulic jet pump (3) is provided above the acid circulation tank (2). The outlet zone (17) is connected to the hydraulic jet pump (3) through the connecting pipe (15).
2. The liquid hydrogen chloride cylinder tail gas absorption device according to claim 1, characterized in that, The absorption zone (16) is located above the liquid outlet zone (17), and a tube (18) is provided between the absorption zone (16) and the liquid outlet zone (17).
3. The liquid hydrogen chloride cylinder tail gas absorption device according to claim 2, characterized in that, The absorption zone (16) is connected to the inlet pipe (8) of the falling film absorber, and the outer side of the tube (18) is connected to the inlet pipe (9) and the outlet pipe (10) of the circulating cooling water.
4. The liquid hydrogen chloride cylinder tail gas absorption device according to claim 1, characterized in that, A liquid outlet pipe (4) is provided between the liquid outlet area (17) and the U-shaped bend (6). A sight glass (5) is provided on the liquid outlet pipe (4). An inlet pipe (11) is connected between the liquid outlet pipe (4) and the U-shaped bend (6).
5. The liquid hydrogen chloride cylinder tail gas absorption device according to claim 1, characterized in that, The U-shaped bend (6) is provided with an acid circulation tank inlet pipe (12) between it and the acid circulation tank (2), and a water inlet (19) is provided above the acid circulation tank (2).
6. The liquid hydrogen chloride cylinder tail gas absorption device according to claim 1, characterized in that, The acid circulation tank (2) is connected to the hydraulic jet pump (3) via the acid circulation pump (7). A circulation pipe (13) is provided between the acid circulation pump (7) and the hydraulic jet pump (3). The circulation pipe (13) is connected to the absorption zone (16) via the absorption water pipe (14).
7. The liquid hydrogen chloride cylinder tail gas absorption device according to claim 1, characterized in that, The buffer tank (20) is connected to a buffer tank inlet pipe (21), and the buffer tank inlet pipe (21) is provided with a pressure limiting orifice plate (22) and a first-stage corrugated expansion joint (23). The buffer tank (20) is provided with a porous flow divider plate (25).
8. The liquid hydrogen chloride cylinder tail gas absorption device according to claim 1, characterized in that, The inlet pipe (8) of the falling film absorber is provided with a secondary corrugated expansion joint (24), and a stainless steel wire mesh layer (26) is provided at the connection between the inlet pipe (8) and the falling film absorber (1).