Sulfuric acid processing waste gas treatment device

Abstract

This utility model discloses a sulfuric acid processing waste gas treatment device, including a treatment tank and an exhaust port installed on the top of the treatment tank. It also includes a heat exchange tube installed inside the treatment tank, an inlet pipe installed inside the treatment tank, jet nozzles installed on the inlet pipe to deliver waste gas into the treatment tank, a packing assembly installed inside the treatment tank for preliminary filtration of the waste gas, a drive assembly installed on the treatment tank, and a water spraying assembly installed on the drive assembly. As the waste gas passes through the packing assembly, the water spraying assembly simultaneously sprays water for secondary purification. Uniform diffusion of the waste gas is achieved through a 6-8 circumferentially arrayed inclined jet nozzles, which, combined with a baffle plate driven by the drive assembly, disperses the airflow, completely eliminating "flow deviation." Simultaneously, the stepped guide plate and atomized water spraying work together to extend the contact time between the waste gas and the absorbent liquid by more than 50%, increasing the desulfurization efficiency of the sulfuric acid waste gas to over 98%, and preventing the direct discharge of untreated acidic gas.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, specifically a waste gas treatment device for sulfuric acid processing. Background Technology

[0002] In the chemical industry, sulfuric acid, as a basic chemical raw material, inevitably generates a large amount of waste gas during its production and processing. This waste gas has a complex composition and is highly hazardous. Traditional simple discharge or inefficient treatment methods can no longer meet environmental protection requirements, so new waste gas treatment devices are a necessity.

[0003] In existing technologies, most waste gas inlets are single-sided, single-port designs. After the waste gas enters the absorption tower, it is easy to form "eccentric flow". In some areas, the airflow velocity is too fast, and the contact time with the absorbent liquid is insufficient, forming a desulfurization blind zone. The untreated acidic gas is directly discharged, while in areas with too slow a flow velocity, by-products are easily accumulated, further aggravating the uneven airflow distribution. Moreover, sulfuric acid processing waste gas often carries waste heat of 60-80℃. Existing devices do not recover this heat. High-temperature waste gas directly enters the absorption tower, which not only accelerates the evaporation of the absorbent liquid and increases reagent consumption, but also causes the metal components inside the tower to corrode at a faster rate due to the combined effects of high temperature and acidic environment, shortening the service life of the equipment. Utility Model Content

[0004] The purpose of this invention is to provide a sulfuric acid processing waste gas treatment device to solve the problems mentioned in the background art, such as the waste gas entering the absorption tower causing flow deviation and the lack of waste heat recovery.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sulfuric acid processing waste gas treatment device, including a treatment tank and an exhaust port installed on the top of the treatment tank, a heat exchange tube installed inside the treatment tank, an air inlet pipe installed inside the treatment tank, a jet nozzle installed on the air inlet pipe to transport waste gas into the treatment tank, a packing assembly installed inside the treatment tank to perform preliminary filtration of the waste gas, a drive assembly installed on the treatment tank, and a water spraying assembly installed on the drive assembly. When the waste gas passes through the packing assembly, the water spraying assembly simultaneously sprays water to perform secondary purification of the waste gas.

[0006] Based on the preferred embodiment of this technical solution, a plurality of jet heads are provided, and the plurality of jet heads are evenly distributed in a circumferential array on the air intake pipe, and the jet heads are installed at an angle.

[0007] Based on the preferred embodiment of this technical solution, the packing assembly includes an installation shell installed inside the treatment tank, a diversion plate installed inside the installation shell, and purification packing installed between the diversion plate and the installation shell, with the diversion plate guiding the water sprayed by the water spraying assembly.

[0008] Based on the preferred embodiment of this technical solution, the guide plate is provided with several stepped grooves for the exhaust gas to pass through, and a groove for water to pass through is provided between the guide plate and the mounting shell.

[0009] According to the preferred embodiment of this technical solution, the drive assembly includes a hollow plate mounted on the treatment tank, a rotating shaft rotatably connected to the hollow plate, a baffle plate fixedly connected to the rotating shaft, a first pulley fixedly connected to the rotating shaft, a drive motor mounted on the treatment tank, a second pulley fixedly connected to the output end of the drive motor, and a synchronous belt installed between the second pulley and the first pulley. When the exhaust gas rises and passes through the baffle plate, the baffle plate rotates and disturbs the exhaust gas.

[0010] In the preferred embodiment of this technical solution, the diversion plate and the purification packing are provided with through holes at corresponding positions on the rotating shaft, and the rotating shaft passes through the through holes.

[0011] According to the preferred embodiment of this technical solution, the water spraying assembly includes a positioning frame fixedly connected to the bottom of the hollow plate, a diverter plate rotatably connected to the positioning frame, a spray head installed on the diverter plate, a water pump installed on the treatment tank, and a water delivery pipe installed between the treatment tank and the water pump. The water pump delivers water from the bottom of the treatment tank to the interior of the positioning frame through the water delivery pipe.

[0012] Based on the preferred embodiment of this technical solution, the positioning frame and the diversion plate are provided with a communicating water storage cavity.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. The uniform diffusion of exhaust gas is achieved through 6-8 circumferential array of inclined jet heads, and the airflow is dispersed by the baffle driven by the drive component, which completely eliminates "flow deviation"; at the same time, the stepped guide plate and atomized water spray work together to extend the contact time between exhaust gas and absorbent liquid by more than 50%, and improve the desulfurization efficiency of sulfuric acid exhaust gas to more than 98%, avoiding the direct discharge of untreated acidic gas.

[0014] 2. Titanium alloy heat exchange tubes can efficiently recover waste heat (waste heat recovery rate of over 70%), which can be used to preheat production water and reduce enterprise energy consumption; at the same time, the temperature of the exhaust gas is reduced to 30-40℃, reducing the evaporation loss of the absorbent liquid (reducing reagent consumption by 40%), and avoiding accelerated corrosion of metal parts in the treatment tank due to the dual effects of "high temperature + acidity", extending the service life of the equipment to more than 1.5 times that of existing technologies. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of one embodiment of the sulfuric acid processing waste gas treatment device of this utility model; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the intermediate processing tank; Figure 3 This is a schematic diagram of the jet head structure of this utility model; Figure 4 This is a cross-sectional view of the mounting shell structure of this utility model; Figure 5 This is a schematic cross-sectional view of the diversion plate of this utility model; Figure 6 This is a schematic diagram of the mating structure of the mounting shell and the diversion plate of this utility model; Figure 7 This is a schematic diagram of the drive component structure of this utility model; Figure 8 for Figure 6 Enlarged structural diagram at point A in the middle.

[0016] In the diagram: 1. Treatment tank; 21. Exhaust port; 22. Heat exchange tube; 23. Inlet pipe; 24. Jet nozzle; 31. Mounting shell; 32. Drain plate; 33. Purification packing; 41. Hollow plate; 42. Rotating shaft; 43. Baffle plate; 44. First pulley; 45. Drive motor; 46. Second pulley; 47. Synchronous belt; 51. Positioning frame; 52. Diverter plate; 53. Spray nozzle; 54. Water pump; 55. Water supply pipeline. Detailed Implementation

[0017] 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.

[0018] Please see Figure 1 -8. This utility model provides an embodiment of a sulfuric acid processing waste gas treatment device, including a treatment tank 1 and an exhaust port 21 installed on the top of the treatment tank 1, a heat exchange tube 22 installed inside the treatment tank 1, an air inlet pipe 23 installed inside the treatment tank 1, a jet nozzle 24 installed on the air inlet pipe 23 to transport waste gas into the treatment tank 1, a packing assembly installed inside the treatment tank 1 for preliminary filtration of the waste gas, a drive assembly installed on the treatment tank 1, and a water spraying assembly installed on the drive assembly. When the waste gas passes through the packing assembly, the water spraying assembly... Simultaneous water spraying provides secondary purification of the waste gas. The treatment tank 1 is made of 316L stainless steel, which has excellent resistance to sulfuric acid corrosion and can withstand acidic waste gas erosion for a long time, extending the service life of the device. The heat exchange tube 22 is made of titanium alloy, with a high thermal conductivity of about 17W / (m・K), which can efficiently recover the waste heat of 60-80℃ in the waste gas. The recovered heat can be used to preheat production water, reducing energy consumption. The inner wall of the exhaust port 21 is lined with a fluororubber sealing gasket to enhance the sealing performance, and an activated carbon filter is installed at the outlet to further adsorb untreated trace amounts of harmful gases.

[0019] Please see Figure 3 A further solution based on this embodiment is as follows: a plurality of jet heads 24 are provided, and the plurality of jet heads 24 are evenly distributed in a circumferential array on the air inlet pipe 23, and the jet heads 24 are installed at an angle. The number of jet heads 24 is set to 6-8. The circumferential array distribution can make the exhaust gas diffuse evenly in the treatment tank 1 and avoid the phenomenon of "deviation". The tilt angle is 30°-45°, which can guide the exhaust gas to flow obliquely upward and prolong the contact time with the subsequent purification components. The jet heads 24 are made of polytetrafluoroethylene material, which is acid and heat resistant and has a long-term operating temperature of -200°C to 260°C, so as to avoid being corroded and blocked by sulfuric acid exhaust gas.

[0020] Please see Figure 4 - Figure 5 A further embodiment of this solution is as follows: The packing assembly includes an installation shell 31 installed inside the treatment tank 1, a diversion plate 32 installed inside the installation shell 31, and a purification packing 33 installed between the diversion plate 32 and the installation shell 31. The diversion plate 32 guides the water sprayed by the water spraying assembly. The installation shell 31 is made of PPH plastic, which is corrosion-resistant and has good toughness, and can avoid cracking when in contact with acidic water. The diversion plate 32 is also made of PPH material, with a smooth surface that is not easy to accumulate dirt, and can guide the water spraying to evenly cover the purification packing 33. The purification packing 33 is made of polypropylene multi-faceted hollow spheres with a specific surface area of ​​200-300㎡ / m³, which can fully adsorb acidic substances in the exhaust gas and improve the preliminary filtration effect. Multiple installation shells 31 and purification packing 33 can be set according to actual use. The material of the additional purification packing 33 can be selected as needed, which will not be described in detail here.

[0021] Please see Figure 5 A further solution based on this embodiment is as follows: the guide plate 32 is provided with a number of stepped grooves for the exhaust gas to pass through, and a groove for water to pass through is provided between the guide plate 32 and the mounting shell 31. The stepped grooves can extend the exhaust gas passage path and increase the contact time with the purification packing 33, allowing the gas to pass upward, but the water flow will skip directly. The grooves allow the liquid to pass through and fall to the bottom of the treatment tank 1, and the liquid falling through the grooves will not contact the heat exchange tube 22, so as not to affect the heat exchange operation between the heat exchange tube 22 and the exhaust gas.

[0022] Please see Figure 4 , Figure 7 - Figure 8A further embodiment of this solution is as follows: The drive assembly includes a hollow plate 41 mounted on the treatment tank 1, a rotating shaft 42 rotatably connected to the hollow plate 41, a baffle plate 43 fixedly connected to the rotating shaft 42, a first pulley 44 fixedly connected to the rotating shaft 42, a drive motor 45 mounted on the treatment tank 1, a second pulley 46 fixedly connected to the output end of the drive motor 45, and a synchronous belt 47 installed between the second pulley 46 and the first pulley 44. When the exhaust gas rises and passes through the baffle plate 43, the baffle plate 43 rotates to disturb the exhaust gas. The rotating shaft 42 is made of titanium alloy, which is high in strength and corrosion resistant, and can withstand the rotational torque of the baffle plate 43 for a long time. The baffle plate 43 is made of PPH plastic and has guide ribs on its surface. When rotating, it can disperse the airflow and prevent the exhaust gas from accumulating. The first pulley 44 and the second pulley 46 are made of stainless steel, and the synchronous belt 47 is made of polyurethane, which is oil-resistant and corrosion-resistant, ensuring stable transmission. The drive motor 45 is explosion-proof, suitable for the flammable and explosive environment of sulfuric acid processing, and safe to operate.

[0023] Please see Figure 4 A further solution based on this embodiment is as follows: the diversion plate 32 and the purification packing 33 are provided with through holes at corresponding positions on the rotating shaft 42, and the rotating shaft 42 passes through the through holes. The diameter of the through holes is 2-3mm larger than the outer diameter of the rotating shaft 42. This avoids friction and wear between the rotating shaft 42 and the diversion plate 32 and the purification packing 33 when the rotating shaft 42 rotates, and allows some water to flow through the through holes, which cleans and cools the rotating shaft 42 and prevents acidic substances from adhering and corroding it.

[0024] Please see Figure 4 , Figure 8 A further embodiment of this solution is as follows: The water spraying assembly includes a positioning frame 51 fixedly connected to the bottom of the hollow plate 41, a diverter plate 52 rotatably connected to the positioning frame 51, a spray head 53 installed on the diverter plate 52, a water pump 54 installed on the treatment tank 1, and a water supply pipe 55 installed between the treatment tank 1 and the water pump 54. The water pump 54 transports water from the bottom of the treatment tank 1 to the interior of the positioning frame 51 through the water supply pipe 55. Both the positioning frame 51 and the diverter plate 52 are made of PPH material, which is lightweight and corrosion resistant. The diverter plate 52 can rotate slightly around the positioning frame 51 to adapt to changes in water pressure. The spray head 53 is a spiral atomizing nozzle with an atomization particle size of 50-100μm, which can increase the contact area with the exhaust gas. The nozzle material is polytetrafluoroethylene, which is anti-clogging and corrosion resistant. The water pump 54 is an acid-resistant centrifugal pump, which can transport circulating water containing acidic substances. The water supply pipe 55 is an FRP fiberglass pipe, which is corrosion resistant and has a smooth inner wall, reducing water flow resistance.

[0025] Please see Figure 8A further solution based on this embodiment is as follows: the positioning frame 51 and the diverter plate 52 are provided with communicating water storage cavities. The wall thickness of the water storage cavity is 3-5mm to ensure structural strength and avoid rupture caused by excessive water pressure. The communicating cavities of the two can make the water flow evenly distributed to the diverter plate 52, thereby making the water pressure of the spray head 53 consistent, the atomization effect uniform, ensuring the uniform degree of exhaust gas purification, and avoiding insufficient local purification.

[0026] Working Principle: The waste gas generated from sulfuric acid processing, containing acidic gases such as SO2, with a temperature of 60-80℃, first enters the inlet pipe 23 inside the treatment tank 1. Through the inclined jet nozzles 24 arranged in a circular array on the inlet pipe 23, the gas is evenly diffused into the lower space of the treatment tank 1, preventing "deviation" of the waste gas flow. During the upward movement of the waste gas, it first contacts the heat exchange tubes 22 inside the treatment tank 1. The heat exchange tubes 22 absorb the residual heat in the waste gas, reducing its temperature to 30-40℃, reducing subsequent absorption liquid evaporation losses. The cooled waste gas continues to rise, passing through the mounting shell 31 of the packing assembly, and through the stepped channels on the guide plate 32, fully contacting the purification packing 33 between the guide plate 32 and the mounting shell 31. The purification packing 33 initially adsorbs the acidic substances in the waste gas, completing preliminary filtration. Simultaneously, the drive assembly and water spraying assembly are activated: the drive motor 45 rotates, driving the first pulley through the second pulley 46 and the synchronous belt 47. The rotation of the 44 shaft causes the 42 shaft and the baffle 43 to rotate on the hollow plate 41. The baffle 43 disperses the rising exhaust gas, preventing it from accumulating and further optimizing the airflow distribution. The water pump 54 delivers the circulating water containing alkaline absorbent from the bottom of the treatment tank 1 to the water storage cavity of the positioning frame 51 through the water pipe 55. The water is then distributed to each spray head 53 through the cavity of the connecting diverter plate 52. The spray head 53 atomizes the water and sprays it onto the purification packing 33 and the exhaust gas, achieving full contact between the exhaust gas and the absorbent liquid. This provides secondary purification of the exhaust gas and neutralizes acidic substances. The water flows through the groove, passing slightly over the heat exchange tube 22, to the bottom of the treatment tank 1. The secondary purified exhaust gas continues to rise and is discharged through the exhaust port 21 at the top of the treatment tank 1. The filter screen of the exhaust port 21 adsorbs trace amounts of residual harmful gases. The acidic wastewater generated during the purification process flows back to the bottom of the treatment tank 1 and is recycled by the water pump 54. With the addition of an appropriate amount of alkaline agent, the operation can continue.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for treating waste gas from sulfuric acid production, comprising a treatment tank (1) and an exhaust port (21) installed on the top of the treatment tank (1), characterized in that: It also includes a heat exchange tube (22) installed inside the treatment tank (1), an air inlet pipe (23) installed inside the treatment tank (1), a jet nozzle (24) installed on the air inlet pipe (23) to deliver exhaust gas into the treatment tank (1), a packing assembly installed inside the treatment tank (1) to perform preliminary filtration of exhaust gas, a drive assembly installed on the treatment tank (1), and a water spraying assembly installed on the drive assembly. When the exhaust gas passes through the packing assembly, the water spraying assembly sprays water simultaneously to perform secondary purification of the exhaust gas.

2. The sulfuric acid process off-gas treatment apparatus according to claim 1, characterized by: There are several jet heads (24), and the jet heads (24) are evenly distributed in a circumferential array on the air intake pipe (23), and the jet heads (24) are installed at an angle.

3. The sulfuric acid process off-gas treatment apparatus according to claim 2, characterized by: The packing assembly includes a mounting shell (31) installed inside the treatment tank (1), a diversion plate (32) installed inside the mounting shell (31), and a purification packing (33) installed between the diversion plate (32) and the mounting shell (31), through which the water sprayed by the water spraying assembly is guided.

4. The sulfuric acid process off-gas treatment apparatus according to claim 3, characterized by: The diversion plate (32) has several stepped grooves for the exhaust gas to pass through, and a groove for water to pass through is provided between the diversion plate (32) and the mounting shell (31).

5. The sulfuric acid process off-gas treatment apparatus according to claim 4, characterized by: The drive assembly includes a hollow plate (41) mounted on the treatment tank (1), a rotating shaft (42) rotatably connected to the hollow plate (41), a baffle plate (43) fixedly connected to the rotating shaft (42), a first pulley (44) fixedly connected to the rotating shaft (42), a drive motor (45) mounted on the treatment tank (1), a second pulley (46) fixedly connected to the output end of the drive motor (45), and a synchronous belt (47) installed between the second pulley (46) and the first pulley (44). When the exhaust gas rises and passes through the baffle plate (43), the baffle plate (43) rotates and disturbs the exhaust gas.

6. The sulfuric acid process off-gas treatment apparatus according to claim 5, characterized by: The diversion plate (32) and the purification packing (33) have through holes at corresponding positions on the rotating shaft (42), and the rotating shaft (42) passes through the through holes.

7. The sulfuric acid process off-gas treatment apparatus according to claim 6, characterized by: The water spraying assembly includes a positioning frame (51) fixedly connected to the bottom of the hollow plate (41), a diverter plate (52) rotatably connected to the positioning frame (51), a spray head (53) installed on the diverter plate (52), a water pump (54) installed on the treatment tank (1), and a water delivery pipe (55) installed between the treatment tank (1) and the water pump (54). The water pump (54) delivers water from the bottom of the treatment tank (1) to the inside of the positioning frame (51) through the water delivery pipe (55).

8. The sulfuric acid process off-gas treatment apparatus according to claim 7, characterized by: The positioning frame (51) and the diversion plate (52) are provided with a communicating water storage cavity.

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