Device for producing sulfuric acid by using acid gas

Abstract

The utility model relates to the technical field of chemical production equipment, and discloses a device for producing sulfuric acid by using acid gas, which comprises a mixing box and a sulfuric acid steam condenser, the outer side of the mixing box is fixedly connected with an explosion-proof mechanism, and the outer side of the sulfuric acid steam condenser is fixedly connected with a quick-release filtering mechanism. The explosion-proof mechanism comprises an explosion-proof buffer pipe, the outer side of the explosion-proof buffer pipe is fixedly connected to the outer side of the mixing box, the inner side of the explosion-proof buffer pipe is fixedly connected with a fixing ring, and the inner side of the fixing ring is slidably connected with an anti-backflow assembly. According to the utility model, when the explosion-proof mechanism normally operates, gas pushes the explosion-proof plug to flow into the buffer cavity, the explosion-proof plug is driven by a spring and other structures to block airflow during explosion, the safety of the device is ensured, the quick-release filtering mechanism is supplied with gas by a cooling fan and filtered by a porous plate, and a filtering part is conveniently replaced and the stability of the condenser is maintained by virtue of an L-shaped sliding chute and a quick-release pull rod; and the production efficiency and the device operation reliability are improved.

Description

Technical Field

[0001] This utility model relates to the field of chemical production equipment technology, and in particular to an apparatus for producing sulfuric acid using acidic gas. Background Technology

[0002] Sulfuric acid is a highly corrosive inorganic acid with a wide range of applications in industry, including fertilizer manufacturing, petroleum refining, and metal smelting. In modern production, sulfuric acid is a basic chemical raw material, and its output is often regarded as an indicator of a country's level of chemical development. With the development of various industries, the demand for sulfuric acid continues to grow.

[0003] Wet sulfuric acid production technology is an important sulfuric acid production process. It converts sulfur-containing acidic gases into sulfuric acid, effectively reducing harmful gas emissions and achieving resource recycling in industrial production. It is also indirectly relevant to daily life, as many products rely on sulfuric acid, from detergents and batteries to cement. Sulfuric acid is essential for adjusting the pH of detergents, serving as a battery electrolyte, and optimizing cement performance, quietly but crucially supporting modern industry. Wet sulfuric acid production technology ensures the supply of sulfuric acid. A wet sulfuric acid plant mainly consists of a combustion furnace, a converter, and an absorption tower. The combustion furnace burns the raw materials to produce sulfur dioxide; the converter converts sulfur dioxide into sulfur trioxide; and the absorption tower absorbs the sulfur trioxide to produce sulfuric acid. The overall preparation process involves burning the raw materials, followed by conversion and absorption steps to produce sulfuric acid.

[0004] In existing sulfuric acid production plants, the combustion furnace poses a safety hazard. During normal operation, the guidance measures for the emission of high-pressure mixed gas are inadequate; in the event of an accidental explosion, the high-speed gas flow is difficult to stop quickly, and acidic and fuel gases continue to flow in, causing the explosion to intensify. This not only poses a certain threat to the safety of the plant but also causes significant accident losses, disrupts the stability of the production environment, and affects production efficiency and the reliability of plant operation. Therefore, a device for producing sulfuric acid using acidic gases is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides an apparatus for producing sulfuric acid using acidic gas, aiming to improve the problems of insufficient gas emission guidance from the combustion furnace and untimely explosion-proof blocking in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An apparatus for producing sulfuric acid using acidic gas includes a mixing tank and a sulfuric acid vapor condenser. An explosion-proof mechanism is fixedly connected to the outside of the mixing tank, and a quick-release filter mechanism is fixedly connected to the outside of the sulfuric acid vapor condenser.

[0008] The explosion-proof mechanism includes an explosion-proof buffer tube, the outer side of which is fixedly connected to the outer side of the mixing box, a fixing ring fixedly connected to the inner side of the explosion-proof buffer tube, an anti-backflow component slidably connected to the inner side of the fixing ring, and a buffer protection component fixedly connected to the inner side of the explosion-proof buffer tube.

[0009] The buffer protection assembly includes a buffer perforated plate. One end of the explosion-proof buffer tube is provided with a buffer cavity. The outer side of the buffer perforated plate is fixedly connected to the inside of the buffer cavity of the explosion-proof buffer tube. A guide slide rod is fixedly connected to the outer side of the buffer perforated plate. An explosion-proof plug is slidably connected to the outer side of the guide slide rod. The outer side of the explosion-proof plug is slidably connected to the inner side of the fixing ring. By setting an explosion-proof mechanism containing an anti-backflow assembly and a buffer protection assembly on the outside of the mixing box, and setting a quick-release filter mechanism on the outside of the sulfuric acid vapor condenser, explosion-proof protection of the mixing box can be achieved, preventing gas backflow and buffering explosive gas flow. At the same time, it is convenient to quickly disassemble and install the filter components of the condenser cooling air inlet pipe, ensuring the safe and stable operation of the device.

[0010] As a further description of the above technical solution:

[0011] The quick-release filter mechanism includes a cooling air inlet pipe. A cooling fan is fixedly connected to the outside of the sulfuric acid vapor condenser. The outside of the cooling air inlet pipe is fixedly connected to the outside of the cooling fan. A porous filter plate is slidably connected to the inside of the cooling air inlet pipe. An L-shaped groove is opened on the outside of the cooling air inlet pipe. The quick-release filter mechanism delivers air through the cooling fan, removes impurities through the porous filter plate, and facilitates quick release through the L-shaped groove, ensuring efficient operation of the condenser.

[0012] As a further description of the above technical solution:

[0013] A quick-release pull rod is slidably connected to the inner side of the L-shaped slide groove, and a locking spring is fixedly connected to the outer side of the quick-release pull rod. One end of the locking spring is fixedly connected to the outer side of the quick-release pull rod, and the other end of the locking spring is fixedly connected to the inner side of the L-shaped slide groove. The outer side of the quick-release pull rod away from the locking spring is slidably connected to the inner side of the porous filter plate. The L-shaped slide groove, quick-release pull rod, and locking spring work together to facilitate the fixing and disassembly of the porous filter plate, which is beneficial for device maintenance.

[0014] As a further description of the above technical solution:

[0015] The anti-backflow assembly includes a spring 1, one end of which is fixedly connected to the outside of the buffer perforated plate, and the other end of which is fixedly connected to the outside of the explosion-proof plug. A spring 2 is fixedly connected to the outside of the explosion-proof plug, and the end of the spring 2 away from the explosion-proof plug is fixedly connected to the outside of the fixing ring. A sealing explosion-proof groove is opened on the inner side of the explosion-proof buffer tube, and a sealing strip is fixedly connected to the outside of the explosion-proof plug. The anti-backflow assembly relies on spring 1, spring 2, and the sealing structure to allow air to flow under normal conditions and to block gas backflow under abnormal conditions, thus ensuring safety.

[0016] As a further description of the above technical solution:

[0017] A combustion furnace is fixedly connected to the outside of the explosion-proof buffer tube, a waste heat recovery device is fixedly connected to the outside of the combustion furnace, a combined reactor is fixedly connected to the outside of the waste heat recovery device, and the outside of the sulfuric acid vapor condenser is fixedly connected to the outside of the combined reactor. Through the sequentially connected combustion furnace, waste heat recovery device, combined reactor, and sulfuric acid vapor condenser, the efficient conversion of acidic gas into sulfuric acid and the utilization of waste heat are achieved.

[0018] As a further description of the above technical solution:

[0019] The bottom of the sulfuric acid vapor condenser is fixedly connected to a discharge pipe. Multiple rows of condensing tubes are fixedly connected inside the sulfuric acid vapor condenser. Spiral fins are fixedly connected to the inner side of the condensing tubes. A discharge control valve is fixedly connected to the outer side of the discharge pipe. The outer side of the sulfuric acid vapor condenser is connected to the mixing tank through a pipe. The sulfuric acid vapor condenser condenses sulfuric acid through the condensing tubes and spiral fins, and the discharge pipe and valve control the discharge, thereby realizing the production and transportation of sulfuric acid.

[0020] As a further description of the above technical solution:

[0021] A combustion fan is fixedly connected to the outside of the sulfuric acid vapor condenser, an acid mist collector is fixedly connected to the outside of the combustion fan, multiple wire mesh demisters are fixedly connected to the inside of the acid mist collector, and a chimney is fixedly connected to the outside of the acid mist collector. The combustion fan assists combustion, the acid mist collector and the wire mesh demisters remove acid mist, and the chimney discharges exhaust gas in compliance with standards.

[0022] As a further description of the above technical solution:

[0023] Multiple air inlet pipes are fixedly connected to the outside of the mixing box, and a mixing fan is fixedly connected inside the mixing box. Gas is introduced into the mixing box through the air inlet pipes and stirred by the mixing fan to achieve a thorough mixing of acidic gas and fuel gas.

[0024] This utility model has the following beneficial effects:

[0025] 1. In this utility model, when the combustion furnace is operating normally, the high-pressure mixed gas lifts the explosion-proof plug, causing it to detach from the sealed explosion-proof groove, and the gas flows into the buffer chamber. When the combustion furnace explodes unexpectedly, the high-speed airflow impacts the explosion-proof plug, causing it to overcome the elastic force of the second spring. Under the push of the first spring, the sealing strip engages with the sealed explosion-proof groove. The explosion-proof plug is driven to work through the spring, buffer perforated plate and other structures, which can block the airflow at the moment of explosion, prevent acid and fuel gases from entering, avoid the explosion from escalating, ensure the safety of the device, reduce accident losses, and maintain the stability of the production environment.

[0026] 2. In this utility model, the cooling fan pressurizes external air and sends it into the cooling air inlet duct. The porous filter plate filters impurities. When replacing the filter plate, it can be quickly disassembled and installed by pulling along the L-shaped slide groove and rotating the quick-release rod. This quick-release filter mechanism, through the L-shaped slide groove and quick-release rod, drives the porous filter plate to work, enabling efficient and convenient replacement of filter components. This ensures the purity of the cooling air, maintains stable operation of the sulfuric acid vapor condenser, reduces maintenance costs, and improves production efficiency and equipment reliability. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of an apparatus for producing sulfuric acid using acidic gas, as proposed in this utility model.

[0028] Figure 2 This is a schematic diagram of the structure of a mixing fan in an apparatus for producing sulfuric acid using acidic gas, as proposed in this utility model.

[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 This is a schematic diagram of the structure of a wire mesh demister in an apparatus for producing sulfuric acid using acidic gas, as proposed in this utility model.

[0031] Figure 5 This is a schematic diagram of the discharge control valve of an apparatus for producing sulfuric acid using acidic gas, as proposed in this utility model.

[0032] Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0033] Legend:

[0034] 1. Mixing box; 2. Air inlet pipe; 3. Mixing fan; 4. Explosion-proof buffer pipe; 5. Fixing ring; 6. Explosion-proof plug; 7. Buffer perforated plate; 8. Spring 1; 9. Guide slide rod; 10. Sealing strip; 11. Spring 2; 12. Combustion furnace; 13. Waste heat recovery unit; 14. Combined reactor; 15. Sulfuric acid vapor condenser; 16. Cooling fan; 17. Cooling air inlet pipe; 18. Combustion fan; 19. Condenser pipe; 20. Spiral fins; 21. Discharge pipe; 22. Discharge control valve; 23. Acid mist collector; 24. Wire mesh demister; 25. Chimney; 26. Quick-release pull rod; 27. L-shaped slide rail; 28. Engaging spring; 29. ​​Perforated filter plate. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Reference Figures 1 to 4 The present invention provides an embodiment of an apparatus for producing sulfuric acid using acidic gas, comprising a mixing tank 1 and a sulfuric acid vapor condenser 15. The mixing tank 1 has sufficient volume to accommodate the mixing process of acidic gas and fuel gas. The sulfuric acid vapor condenser 15 condenses gaseous sulfuric acid into liquid sulfuric acid by cooling to produce concentrated sulfuric acid. An explosion-proof mechanism is fixedly connected to the outside of the mixing tank 1, and a quick-release filter mechanism is fixedly connected to the outside of the sulfuric acid vapor condenser 15.

[0037] The explosion-proof mechanism includes an explosion-proof buffer tube 4, which can withstand the internal pressure during normal operation of the device and the instantaneous impact pressure under accidental conditions. The outer side of the explosion-proof buffer tube 4 is fixedly connected to the outer side of the mixing box 1, and the inner side of the explosion-proof buffer tube 4 is fixedly connected to a fixing ring 5. The fixing ring 5 provides a stable sliding guide for the anti-backflow component, ensuring that the anti-backflow component will not shift or shake during operation, thereby reliably realizing its anti-backflow function. The inner side of the fixing ring 5 is slidably connected to the anti-backflow component, and the inner side of the explosion-proof buffer tube 4 is fixedly connected to a buffer protection component.

[0038] The buffer protection component includes a buffer perforated plate 7, which can ensure that the gas can pass smoothly during normal flow and can effectively buffer the high-speed airflow during an explosion. One end of the explosion-proof buffer tube 4 is provided with a buffer cavity. The outer side of the buffer perforated plate 7 is fixedly connected to the buffer cavity of the explosion-proof buffer tube 4. The outer side of the buffer perforated plate 7 is fixedly connected to a guide slide rod 9, which provides precise sliding guidance for the explosion-proof plug 6, ensuring that the explosion-proof plug 6 can slide stably in a straight line under the action of spring force and gas pressure, avoiding tilting or jamming, thereby ensuring the reliable realization of the explosion-proof function. The outer side of the guide slide rod 9 is slidably connected to the explosion-proof plug 6. The explosion-proof plug 6 allows gas to pass through under normal conditions, and blocks the airflow during an explosion to prevent the explosion from escalating. The outer side of the explosion-proof plug 6 is slidably connected to the inner side of the fixing ring 5.

[0039] The anti-backflow assembly includes a spring 8. During normal gas flow, spring 8 can be appropriately compressed under gas pressure, allowing the explosion-proof plug 6 to have a certain displacement to facilitate gas passage. When an abnormal reverse airflow occurs, spring 8 can quickly provide a reverse elastic force to assist the explosion-proof plug 6 in rapid reset and block the reverse airflow. One end of spring 8 is fixedly connected to the outside of the buffer perforated plate 7, and the other end of spring 8 is fixedly connected to the outside of the explosion-proof plug 6. A spring 11 is fixedly connected to the outside of the explosion-proof plug 6. During normal gas flow, spring 18 assists in positioning the explosion-proof plug 6, keeping it in a suitable initial position. When a reverse airflow occurs, spring 11 works in conjunction with spring 8 to enhance the reset force of the explosion-proof plug 6 and quickly block the reverse airflow. The end of spring 11 away from the explosion-proof plug 6 is fixedly connected to the outside of the fixing ring 5. A sealing explosion-proof groove is provided on the inner side of the explosion-proof buffer tube 4. A sealing strip 10 is fixedly connected to the outside of the explosion-proof plug 6. When the sealing strip 10 is in contact with the explosion-proof buffer tube 4, a seal is achieved to prevent gas leakage.

[0040] An explosion-proof buffer pipe 4 is fixedly connected to a combustion furnace 12. The combustion furnace 12 is equipped with a burner. The burner adopts advanced atomization and air distribution technology, which can fully mix fuel gas and air and stably burn, ensuring that acidic gases such as hydrogen sulfide can be efficiently converted into sulfur dioxide. An external waste heat recovery device 13 is fixedly connected to the outside of the combustion furnace 12. The waste heat recovery device 13 transfers the heat of the high-temperature gas discharged from the combustion furnace 12 to the low-temperature medium through heat exchange, recovering heat and improving energy utilization. A combined reactor 14 is fixedly connected to the outside of the waste heat recovery device 13. The combined reactor 14 is equipped with multiple catalyst beds, which enable sulfur dioxide to be efficiently converted into sulfur trioxide under the action of catalyst, providing raw materials for the subsequent production of sulfuric acid. The external side of the sulfuric acid vapor condenser 15 is fixedly connected to the outside of the combined reactor 14.

[0041] The bottom of the sulfuric acid vapor condenser 15 is fixedly connected to a discharge pipe 21, which is used to discharge the finished concentrated sulfuric acid. Multiple rows of condenser tubes 19 are fixedly connected inside the sulfuric acid vapor condenser 15. Spiral fins 20 are fixedly connected to the inner side of the condenser tubes 19. The condenser tubes 19 and the spiral fins 20 work together to enhance cooling by increasing the heat transfer area, so that the gaseous sulfuric acid is efficiently condensed into liquid. A discharge control valve 22 is fixedly connected to the outer side of the discharge pipe 21. The valve opening can be precisely adjusted by the control system to achieve precise control of the concentrated sulfuric acid discharge. The outer side of the sulfuric acid vapor condenser 15 is connected to the mixing tank 1 through a pipe.

[0042] A combustion fan 18 is fixedly connected to the outside of the sulfuric acid vapor condenser 15, which sends air or other combustion-supporting gases into the combustion furnace 12 to provide sufficient oxygen for the combustion reaction, ensuring that the fuel gas can be fully burned, improving combustion efficiency and reaction stability. An acid mist collector 23 is fixedly connected to the outside of the combustion fan 18. The acid mist collector 23 uses an internal device to cause acid mist particles in the acid mist-containing gas to collide, coalesce, and separate, purifying the exhaust gas. Multiple wire mesh demisters 24 are fixedly connected to the inside of the acid mist collector 23. The wire mesh demisters 24, with their multiple layers of wire mesh, promote the collision and coalescence of acid mist particles, efficiently removing acid mist from the gas. A chimney 25 is fixedly connected to the outside of the acid mist collector 23. The gas treated by the acid mist collector 23 is discharged into the atmosphere through the chimney 25.

[0043] Multiple air inlet pipes 2 are fixedly connected to the outside of the mixing box 1. The air inlet pipes 2 can be used to introduce acid gas and fuel gas. A mixing fan 3 is fixedly connected inside the mixing box 1. The mixing fan 3 rotates at high speed inside the mixing box 1 to fully stir the acid gas and fuel gas and improve the mixing uniformity.

[0044] Reference Figure 1 , Figure 5 and Figure 6 The quick-release filter mechanism includes a cooling air inlet pipe 17, which provides cooling air for the condensation process in the condenser. A cooling fan 16 is fixedly connected to the outside of the sulfuric acid vapor condenser 15. The cooling fan 16 can efficiently draw in external air, pressurize it, and send it into the cooling air inlet pipe 17. The outside of the cooling air inlet pipe 17 is fixedly connected to the outside of the cooling fan 16. A porous filter plate 29 is slidably connected to the inside of the cooling air inlet pipe 17. The porous filter plate 29 can filter impurities in the cooling air and ensure the normal operation of the sulfuric acid vapor condenser 15. An L-shaped groove 27 is provided on the outside of the cooling air inlet pipe 17. The L-shaped groove 27 assists the quick-release pull rod 26 to realize the quick disassembly and installation of the porous filter plate 29 in the cooling air inlet pipe 17.

[0045] A quick-release pull rod 26 is slidably connected to the inner side of the L-shaped slide groove 27, and a locking spring 28 is fixedly connected to the outer side of the quick-release pull rod 26. One end of the locking spring 28 is fixedly connected to the outer side of the quick-release pull rod 26, and the other end of the locking spring 28 is fixedly connected to the inner side of the L-shaped slide groove 27. The outer side of the quick-release pull rod 26 away from the locking spring 28 is slidably connected to the inner side of the porous filter plate 29.

[0046] Working principle: First, acid gas and fuel gas are injected into mixing box 1 through intake pipe 2. During the injection process, mixing fan 3 is started. The rotation of mixing fan 3 mixes acid gas and fuel gas evenly, improving subsequent combustion efficiency and product yield. Then, the mixed gas flows into explosion-proof buffer tube 4. The high-pressure gas pushes the explosion-proof plug 6 outward. Under the thrust of the gas and the elastic force of spring 11, the explosion-proof plug 6 overcomes the pressure of spring 8, causing the sealing strip 10 on the explosion-proof plug 6 to disengage from the sealing explosion-proof groove in the explosion-proof buffer tube 4. Thus, the sealing state of the explosion-proof buffer tube 4 is released, allowing the mixed gas to gradually flow into the buffer chamber.

[0047] After flowing through the buffer perforated plate 7, the mixed gas enters the combustion furnace 12. Under the action of the combustion fan 18, the combustion furnace 12 burns hydrogen sulfide into sulfur dioxide. The gas after the reaction recovers heat through the waste heat recovery unit 13. The sulfur dioxide gas from the waste heat recovery unit 13 enters the combined reactor 14. In the combined reactor 14, the sulfur dioxide is further catalytically oxidized to sulfur trioxide. The generated sulfur trioxide then enters the sulfuric acid vapor condenser 15. The sulfur trioxide reacts with water to first form gaseous sulfuric acid. After the gaseous sulfuric acid flows into the condenser tube 19, it is cooled... Air is introduced by blower 16 to condense gaseous sulfuric acid. As it comes into contact with spiral fins 20, the gaseous sulfuric acid is further condensed into liquid sulfuric acid under the condensing action of the spiral fins 20, producing concentrated sulfuric acid. After condensation is completed, the discharge control valve 22 is opened, and the liquid high-concentration sulfuric acid can flow out through the discharge pipe 21 at the bottom of the sulfuric acid vapor condenser 15. Subsequently, the acidic gas passes through the acid mist collector 23. After flowing through the wire mesh demister 24, the acidic droplets in the gas collide and coalesce with the wire mesh, thereby achieving gas-liquid separation. After removing the acid mist, the gas can be discharged from the chimney 25.

[0048] After the device has been used for a long time, the porous filter plate 29 inside the cooling air inlet pipe 17 needs to be replaced. At this time, pull the quick release rod 26 along the long side of the L-shaped slide groove 27 to release the quick release rod 26 from the locking and fixing of the porous filter plate 29. When pulled to the limit, rotate the quick release rod 26 towards the short side of the L-shaped slide groove 27 to temporarily lock the quick release rod 26. After multiple quick release rods 26 are locked, the porous filter plate 29 can be removed and replaced with a new porous filter plate 29. After placing it in the target position, rotate the quick release rod 26 in the opposite direction. Under the action of the locking spring 28, the quick release rod 26 slides into the groove of the porous filter plate 29 to complete the fixing of the porous filter plate 29.

[0049] When the combustion furnace 12 explodes due to an accident, the high-speed gas flow generated by the explosion rushes into the buffer chamber of the explosion-proof buffer tube 4. With the cooperation of the buffer chamber and the buffer perforated plate 7, the gas flow rate gradually decreases. Under the impact force of the gas, the explosion-proof plug 6 overcomes the elastic force of the second spring 11. The first spring 8 pushes the explosion-proof plug 6 to slide on the outside of the guide slide rod 9. The sealing strip 10 on the outside of the explosion-proof plug 6 engages with the sealing explosion-proof groove of the explosion-proof buffer tube 4, thereby achieving a closed seal on the mixing box 1 and preventing acid gas and fuel gas from re-entering the explosion-proof buffer tube 4 and the combustion furnace 12, which would lead to an aggravation of the explosion.

[0050] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An apparatus for producing sulfuric acid using acidic gas, comprising a mixing tank (1) and a sulfuric acid vapor condenser (15), characterized in that: An explosion-proof mechanism is fixedly connected to the outside of the mixing box (1), and a quick-release filter mechanism is fixedly connected to the outside of the sulfuric acid vapor condenser (15). The explosion-proof mechanism includes an explosion-proof buffer tube (4), the outer side of which is fixedly connected to the outer side of the mixing box (1), the inner side of which is fixedly connected to a fixing ring (5), the inner side of which is slidably connected to an anti-backflow component, and the inner side of which is fixedly connected to a buffer protection component. The buffer protection assembly includes a buffer perforated plate (7), one end of the explosion-proof buffer tube (4) is provided with a buffer cavity, the outer side of the buffer perforated plate (7) is fixedly connected to the inside of the buffer cavity of the explosion-proof buffer tube (4), the outer side of the buffer perforated plate (7) is fixedly connected to a guide slide rod (9), the outer side of the guide slide rod (9) is slidably connected to an explosion-proof plug (6), and the outer side of the explosion-proof plug (6) is slidably connected to the inner side of the fixing ring (5).

2. The apparatus for producing sulfuric acid using acidic gas according to claim 1, characterized in that: The quick-release filter mechanism includes a cooling air inlet pipe (17), a cooling fan (16) is fixedly connected to the outside of the sulfuric acid vapor condenser (15), the outside of the cooling air inlet pipe (17) is fixedly connected to the outside of the cooling fan (16), a porous filter plate (29) is slidably connected to the inside of the cooling air inlet pipe (17), and an L-shaped groove (27) is opened on the outside of the cooling air inlet pipe (17).

3. The apparatus for producing sulfuric acid using acidic gas according to claim 2, characterized in that: A quick-release pull rod (26) is slidably connected to the inner side of the L-shaped slide groove (27). A locking spring (28) is fixedly connected to the outer side of the quick-release pull rod (26). One end of the locking spring (28) is fixedly connected to the outer side of the quick-release pull rod (26), and the other end of the locking spring (28) is fixedly connected to the inner side of the L-shaped slide groove (27). The outer side of the end of the quick-release pull rod (26) away from the locking spring (28) is slidably connected to the inner side of the porous filter plate (29).

4. The apparatus for producing sulfuric acid using acidic gas according to claim 1, characterized in that: The anti-backflow assembly includes a spring (8), one end of which is fixedly connected to the outside of the buffer porous plate (7), and the other end of which is fixedly connected to the outside of the explosion-proof plug (6). A spring (11) is fixedly connected to the outside of the explosion-proof plug (6), and the end of the spring (11) away from the explosion-proof plug (6) is fixedly connected to the outside of the fixing ring (5). A sealing explosion-proof groove is provided on the inner side of the explosion-proof buffer tube (4), and a sealing strip (10) is fixedly connected to the outside of the explosion-proof plug (6).

5. The apparatus for producing sulfuric acid using acidic gas according to claim 1, characterized in that: The explosion-proof buffer tube (4) is fixedly connected to a combustion furnace (12), the combustion furnace (12) is fixedly connected to a waste heat recovery unit (13), the waste heat recovery unit (13) is fixedly connected to a combined reactor (14), and the sulfuric acid vapor condenser (15) is fixedly connected to the outside of the combined reactor (14).

6. The apparatus for producing sulfuric acid using acidic gas according to claim 1, characterized in that: The bottom of the sulfuric acid vapor condenser (15) is fixedly connected to a discharge pipe (21). Multiple rows of condenser tubes (19) are fixedly connected inside the sulfuric acid vapor condenser (15). Spiral fins (20) are fixedly connected to the inner side of the condenser tubes (19). A discharge control valve (22) is fixedly connected to the outer side of the discharge pipe (21). The outer side of the sulfuric acid vapor condenser (15) is connected to the mixing box (1) through a pipe.

7. The apparatus for producing sulfuric acid using acidic gas according to claim 1, characterized in that: A combustion fan (18) is fixedly connected to the outside of the sulfuric acid vapor condenser (15), an acid mist collector (23) is fixedly connected to the outside of the combustion fan (18), a plurality of wire mesh demisters (24) are fixedly connected to the inside of the acid mist collector (23), and a chimney (25) is fixedly connected to the outside of the acid mist collector (23).

8. The apparatus for producing sulfuric acid using acidic gas according to claim 1, characterized in that: Multiple air intake pipes (2) are fixedly connected to the outside of the mixing box (1), and a mixing fan (3) is fixedly connected inside the mixing box (1).

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