A toxic gas pressure stabilization system

Abstract

This invention provides a toxic gas pressure stabilization system, including an electrolytic cell, a water-sealed container, an automatic water replenishment unit, an overflow safety unit, a chlorine treatment unit, and an emergency response unit. The water-sealed container is constructed of a single welded titanium alloy, ensuring corrosion resistance and preventing leakage. The automatic water replenishment unit is equipped with a level transmitter, a level controller, and a water-sealed level regulating valve to achieve dynamic level balance and trigger a DCS alarm in case of abnormalities. Overpressured chlorine gas enters the emergency response tower, is treated with alkaline absorbent liquid, and is then discharged. The chlorine treatment bus is equipped with a pressure transmitter and regulating valve to stabilize the chlorine delivery pressure. A bottom drain pipe and a drain valve facilitate maintenance and residual liquid disposal. An industrial water source design ensures continuous and stable water replenishment. This device extends equipment lifespan, reduces the risk of misjudgment, ensures safe handling, and adapts to various operating conditions.

Description

Technical Field

[0001] This utility model relates to the field of safety equipment technology in chemical production, specifically to a toxic gas pressure stabilization system. Background Technology

[0002] The production of potassium hydroxide generates toxic gases such as chlorine. Precise pressure control is crucial during its transportation, storage, and use; otherwise, leaks, explosions, and other safety and environmental accidents may occur. Currently, toxic gas pressure stabilization primarily utilizes PVC water-sealed devices. These devices are fully enclosed, preventing gas escape when the pressure is within the design range, and sending the gas to a purging system for treatment through a venting pipe in case of overpressure.

[0003] However, the existing water seal has obvious defects: First, the PVC material is prone to aging and the weld is prone to cracking, which can lead to the leakage of toxic gases; second, there is no liquid level display, and the drop in liquid level will reduce the pressure stabilization capacity, which may cause a large amount of gas to enter the purifying device, resulting in safety and environmental accidents and increased operating costs; third, manual on-site water replenishment is required, which is not timely, affects the stability of the equipment and increases the labor intensity of the operators. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned technical defects and provide a toxic gas pressure stabilization system.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a toxic gas pressure stabilization system, comprising:

[0006] The electrolytic cell has its chlorine output terminal connected to the chlorine treatment bus.

[0007] The water-sealed container has its air inlet connected to the chlorine treatment bus via pipeline A, and its exhaust port connected to the emergency response unit.

[0008] An automatic water replenishment unit includes a level transmitter installed on the water seal container and a water replenishment pipeline connected to an industrial water source. The water replenishment pipeline is equipped with a water seal level regulating valve controlled by the level transmitter.

[0009] The overflow safety unit includes an overflow pipe located on the upper part of the water seal container and a receiving tank connected to the overflow pipe;

[0010] The chlorine treatment unit includes a chlorine scrubbing tower connected to the chlorine treatment bus via a B pipeline. The chlorine scrubbing tower is equipped with a first spraying mechanism and a first packing layer for gas purification.

[0011] As a preferred embodiment of this application, the accident handling unit includes an accident handling tower, which receives overpressure exhaust from the water seal container through a first exhaust pipe. The accident handling tower is filled with alkaline absorbent liquid and is equipped with a second packing layer and a second spraying mechanism. The top of the tower is connected to an atmospheric exhaust port via an accident fan.

[0012] As a preferred embodiment of this application, the water seal container adopts an integrally welded titanium alloy structure.

[0013] As a preferred embodiment of this application, the automatic water replenishment unit further includes a level controller interlocked with the level transmitter, which is configured to open the water seal level regulating valve when the level is lower than a first threshold, close the water seal level regulating valve when the level is higher than a second threshold, and trigger a DCS alarm when the level is abnormal.

[0014] As a preferred embodiment of this application, the water seal container is also equipped with a local liquid level gauge.

[0015] As a preferred embodiment of this application, the bottom of the water seal container is provided with a drain pipe, the drain pipe is equipped with a drain valve, and the end of the drain pipe is connected to the receiving tank.

[0016] As a preferred embodiment of this application, the industrial water source includes an industrial water tank and an industrial water pump, and the outlet of the industrial water pump is connected to a water supply pipeline via a pipeline.

[0017] As a preferred embodiment of this application, the chlorine processing bus is equipped with a chlorine pressure transmitter and a chlorine pressure regulating valve, which are configured to stabilize the upstream gas pressure of the chlorine processing bus.

[0018] The advantages of this application compared to existing technologies are:

[0019] The toxic gas pressure stabilizing device proposed in this application has significant advantages. In terms of materials, the water seal container adopts an integrally welded titanium alloy structure. The titanium material forms a dense oxide film in a humid chlorine environment, and its corrosion resistance and aging resistance are far superior to traditional PVC materials. Moreover, the integral welding eliminates gaps, eliminates the risk of leakage, ensures long-term sealing and structural integrity, and extends the service life of the equipment.

[0020] In terms of liquid level control, the automatic water replenishment unit is equipped with a liquid level transmitter, a liquid level controller, and a water seal liquid level regulating valve to achieve dynamic liquid level balance. It also has a local liquid level gauge for dual monitoring to reduce the risk of misjudgment and ensure that the liquid level is controllable. At the same time, abnormal liquid level fluctuations will trigger an audible and visual alarm in the DCS system to avoid the lag of manual water replenishment.

[0021] For safe handling, overpressured chlorine gas enters the emergency treatment tower, where it reacts fully with the alkaline absorbent liquid to transform into harmless salts. The second packing layer and spray system enhance absorption efficiency, while the emergency fan ensures stable exhaust gas emissions, preventing environmental harm. Furthermore, the chlorine treatment bus is equipped with pressure transmitters and regulating valves to stabilize chlorine delivery pressure, reducing frequent water seal activation and system overpressure. Bottom drain pipes and exhaust valves facilitate maintenance and residual liquid treatment, enabling wastewater resource utilization and reducing environmental risks. The industrial water source design ensures continuous and stable water replenishment, adapting to different operating conditions. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a toxic gas pressure stabilization system according to this application.

[0023] As shown in the figure: 1. Electrolytic cell, 2. Chlorine treatment bus, 3. Water seal container, 4. Pipeline A, 5. Level transmitter, 6. Water supply line, 7. Water seal level regulating valve, 8. Overflow pipe, 9. Receiving tank, 10. Chlorine scrubbing tower, 11. Pipeline B, 12. Emergency treatment tower, 13. First exhaust line, 14. Emergency fan, 15. Field level gauge, 16. Drainage pipe, 17. Drain valve, 18. Industrial water tank, 19. Industrial water pump, 20. Chlorine pressure transmitter, 21. Chlorine pressure regulating valve. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals.

[0025] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions shown in the attached diagram, while the terms “inside” and “outside” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0026] To make the content of this utility model easier to understand, the following description, in conjunction with the accompanying drawings of the embodiments of this utility model, describes a toxic gas pressure stabilization system, including:

[0027] Electrolytic cell 1, whose chlorine output terminal is connected to chlorine treatment bus 2;

[0028] The water seal container 3 has its air inlet connected to the chlorine treatment bus 2 via pipeline A 4, and its exhaust port connected to the emergency handling unit.

[0029] The automatic water replenishment unit includes a level transmitter 5 installed on the water seal container 3 and a water replenishment pipeline 6 connected to the industrial water source. The water replenishment pipeline 6 is equipped with a water seal level regulating valve 7 controlled by the level transmitter 5.

[0030] The overflow safety unit includes an overflow pipe 8 located on the upper part of the water seal container 3 and a receiving tank 9 connected to the overflow pipe 8;

[0031] The chlorine treatment unit includes a chlorine scrubbing tower 10 connected to the chlorine treatment bus 2 via a B pipeline 11. The chlorine scrubbing tower 10 is equipped with a first spraying mechanism and a first packing layer for gas purification.

[0032] To achieve the safe and harmless treatment of overpressure chlorine gas, the emergency treatment unit includes an emergency treatment tower 12, which receives overpressure exhaust gas from the water seal container 3 through a first exhaust pipe 13. The emergency treatment tower 12 is filled with an alkaline absorbent liquid (such as NaOH solution) and is equipped with a second packing layer and a second spraying mechanism. The alkaline absorbent liquid reacts chemically with the chlorine gas, converting the toxic chlorine into harmless salts. The second packing layer increases the contact area between the chlorine gas and the absorbent liquid, extending the reaction time. The second spraying mechanism ensures sufficient contact between the chlorine gas and the absorbent liquid by uniformly spraying the absorbent liquid, significantly improving absorption efficiency. An emergency fan 14 connected to the top of the tower provides power for gas flow, enabling the purified exhaust gas to be stably discharged into the atmosphere, fundamentally avoiding environmental hazards and safety risks caused by direct emission of toxic gases.

[0033] Considering the highly corrosive nature of wet chlorine gas, the water seal container 3 adopts a one-piece welded titanium alloy structure. In a wet chlorine environment, titanium rapidly forms a dense and stable oxide film. This oxide film effectively prevents further erosion of the material by chlorine gas and its corrosive components (such as hydrochloric acid and chlorate ions generated from dissolved chlorine). Compared to traditional PVC materials, its corrosion resistance and aging resistance are significantly improved. Simultaneously, the one-piece welding process eliminates gaps at the joints, avoiding potential leakage hazards caused by assembly gaps. Both the material and structure aspects jointly ensure the long-term sealing and structural integrity of the water seal container, extending the service life of the equipment.

[0034] To accurately maintain a stable water seal level, the automatic water replenishment unit also includes a level controller interlocked with the level transmitter 5. The level transmitter transmits the water seal container's level data to the level controller in real time. The controller presets a first threshold (safe lower limit) and a second threshold (normal operating upper limit): when the level falls below the first threshold, the controller immediately instructs the water seal level regulating valve 7 to open, rapidly replenishing the water seal with industrial water; when the level rises back to the second threshold, the valve automatically closes, achieving dynamic level balance. Furthermore, if abnormal fluctuations occur in the level (such as sudden rises or falls exceeding the normal range), the controller will simultaneously trigger an audible and visual alarm in the DCS system, promptly alerting operators to intervene and troubleshoot. This effectively avoids the lag of manual water replenishment, prevents water seal failure due to excessively low levels or overflow due to excessively high levels, and significantly improves the system's automation and operational stability.

[0035] To achieve dual monitoring and verification of the liquid level, a local level gauge 15 is also installed on the water seal container 3. This local level gauge (such as a glass tube level gauge or a magnetic level gauge) allows on-site inspectors to visually read the real-time liquid level, which is then cross-referenced with the remote data from the level transmitter 5. This not only verifies the accuracy of the remote data but also serves as a backup monitoring method in case of remote system failure, ensuring that the liquid level remains within a controllable range. This dual monitoring design reduces the risk of misjudgment that may arise from a single monitoring method, facilitates quick detection and handling of liquid level anomalies by operators on-site, and further enhances the reliability of the system monitoring.

[0036] To facilitate maintenance and residual liquid treatment of the water seal container, a drain pipe 16 is installed at the bottom of the water seal container 3. A drain valve 17 is mounted on the drain pipe 16, and the end of the drain pipe 16 is connected to the receiving tank 9. During equipment maintenance or routine upkeep, opening the drain valve 17 completely drains the residual liquid (containing a large amount of dissolved chlorine) from the container, preventing long-term stagnation and corrosion of the container's inner wall. Simultaneously, after the residual liquid is discharged into the receiving tank 9, the chlorine can be removed through a subsequent dechlorination process. The treated liquid can then be recycled back into the water seal system, achieving resource utilization of wastewater. This reduces water waste and avoids the environmental risks associated with direct discharge of chlorine-containing wastewater.

[0037] To ensure a continuous and stable supply of water, the industrial water source includes an industrial water tank 18 and an industrial water pump 19. The outlet of the industrial water pump 19 is connected to the water replenishment pipeline 6 via a pipeline. The industrial water tank 18 serves as a storage unit, capable of storing sufficient industrial water to meet large-scale water replenishment needs in a short period. The industrial water pump 19 provides stable water pressure, ensuring that the water replenishment pipeline 6 has sufficient power to deliver water into the water seal container 3 when opened, quickly reaching the set liquid level. This design avoids water replenishment interruptions or delays caused by insufficient water supply or unstable water pressure, enabling the automatic water replenishment system to adapt to liquid level adjustment needs under different operating conditions, further improving the reliability of the water replenishment process.

[0038] To ensure stable pressure during chlorine transport, a chlorine pressure transmitter 20 and a chlorine pressure regulating valve 21 are installed on the chlorine treatment bus 2. The chlorine pressure transmitter 20 monitors the pressure data within the bus in real time and transmits the signal to the control system; the chlorine pressure regulating valve 21 dynamically adjusts its opening based on the monitoring data—when the pressure is higher than the design value, the valve opens wider to release some chlorine and reduce the pressure; when the pressure is lower than the design value, the valve closes less to reduce release and maintain the pressure. Through this real-time feedback regulation mechanism, the upstream pressure of the chlorine treatment bus 2 can be stabilized within the process requirements, avoiding frequent water seal activation or system overpressure caused by drastic pressure fluctuations. This provides a stable operating condition for subsequent chlorine treatment processes (such as washing and absorption), ensuring the continuous and stable operation of the entire system.

[0039] The toxic gas pressure stabilizing device proposed in this application is mainly used for the pressure stabilization and control of toxic gases such as chlorine in the potassium hydroxide production process. Its core working principle is to achieve precise control and safe treatment of toxic gas pressure through the synergistic effect of a water seal container, an automatic water replenishment unit, an overflow safety unit, and a chlorine treatment unit, as detailed below:

[0040] The chlorine gas produced by electrolytic cell 1 is transported via chlorine treatment bus 2. The chlorine pressure transmitter 20 on the bus monitors the pressure in real time and dynamically adjusts the pressure through chlorine pressure regulating valve 21 to ensure that the system pressure remains stable within the design range. If the pressure exceeds the set value, the chlorine gas will break through the liquid seal of water seal container 3, enter water seal container 3 through pipeline A 4, and be discharged from its exhaust port into emergency treatment tower 12 through first exhaust pipeline 13.

[0041] The water seal container 3 adopts an integrally welded titanium alloy structure, utilizing titanium's strong resistance to wet chlorine gas corrosion to eliminate the risk of leakage due to material aging. The liquid level inside the container is monitored in real time by a level transmitter 5, and the data is transmitted to the DCS system. When the liquid level is lower than the first threshold, the level controller automatically opens the water seal level regulating valve 7, and industrial water is replenished into the water seal container 3 through the water supply pipe 6 until the liquid level returns to a safe range. If the liquid level is abnormal (such as too high or too low), the DCS system triggers an alarm to remind the operator to intervene. In addition, an overflow pipe 8 is installed at the top of the container to discharge excess liquid into the receiving tank 9, preventing the water seal from failing due to excessively high liquid levels.

[0042] After the overpressured chlorine gas is discharged into the emergency treatment tower 12, it comes into full contact with the alkaline absorption liquid (such as NaOH solution) inside the tower. The absorption reaction is completed through the second packing layer and the second spray mechanism, generating harmless salts. The purified exhaust gas is discharged into the atmosphere through the emergency fan 14, ensuring that there is no leakage of toxic gases.

[0043] The chlorine scrubbing tower 10 on the chlorine treatment bus 2 pre-treats the chlorine gas through the first spray mechanism and the first packing layer, removing some impurities and particulate matter and reducing the load on subsequent treatment.

[0044] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A toxic gas pressure stabilizing system characterized by, include: An electrolytic cell (1) has its chlorine output terminal connected to a chlorine processing bus (2); The water seal container (3) has its air inlet connected to the chlorine treatment bus (2) via pipeline A (4) and its exhaust port connected to the emergency handling unit. The automatic water replenishment unit includes a level transmitter (5) installed on the water seal container (3) and a water replenishment pipeline (6) connected to the industrial water source. The water replenishment pipeline (6) is equipped with a water seal level regulating valve (7) controlled by the level transmitter (5). The overflow safety unit includes an overflow pipe (8) located on the upper part of the water seal container (3) and a receiving tank (9) connected to the overflow pipe (8); The chlorine treatment unit includes a chlorine scrubbing tower (10) connected to the chlorine treatment bus (2) via a B pipeline (11). The chlorine scrubbing tower (10) is provided with a first spraying mechanism and a first packing layer for gas purification.

2. The toxic gas pressure stabilizing system according to claim 1, wherein: The accident handling unit includes an accident handling tower (12), which receives overpressure exhaust from the water seal container (3) through a first exhaust pipe (13). The accident handling tower (12) is filled with alkaline absorbent liquid and is equipped with a second packing layer and a second spraying mechanism. The top of the tower is connected to the atmospheric exhaust port via an accident fan (14).

3. The toxic gas pressure stabilizing system according to claim 1 or 2, characterized in that: The water seal container (3) adopts an integrally welded titanium alloy structure.

4. The system according to claim 1, wherein: The automatic water replenishment unit also includes a level controller interlocked with the level transmitter (5), which is configured to open the water seal level regulating valve (7) when the level is lower than the first threshold, close the water seal level regulating valve (7) when the level is higher than the second threshold, and trigger a DCS alarm when the level is abnormal.

5. The toxic gas pressure stabilizing system according to claim 1, wherein: The water seal container (3) is also equipped with a field level gauge (15).

6. The toxic gas pressure stabilizing system according to claim 1, wherein: The bottom of the water seal container (3) is provided with a drain pipe (16), and a drain valve (17) is configured on the drain pipe (16). The end of the drain pipe (16) is connected to the receiving tank (9).

7. The toxic gas pressure stabilizing system of claim 1, wherein: The industrial water source includes an industrial water tank (18) and an industrial water pump (19), the outlet of which is connected to a water supply pipeline (6) via a pipeline.

8. The toxic gas pressure stabilizing system of claim 1, wherein: The chlorine processing bus (2) is equipped with a chlorine pressure transmitter (20) and a chlorine pressure regulating valve (21), which are configured to stabilize the upstream gas pressure of the chlorine processing bus (2).

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