Chlorinated tail gas treatment device

Abstract

The utility model relates to tail gas treatment equipment technical field discloses a kind of chloro tail gas treatment device, comprising: tail gas treatment tank, and the slow flow structure being arranged in the inner chamber of tail gas treatment tank, the gas inlet end of the inner chamber of tail gas treatment tank is provided with packing filter plate, and the temporary residence time of tail gas in tail gas treatment tank is increased to neutralize in tail gas by slow flow structure;The top of tail gas treatment tank is provided with spraying mechanism;Through the cooperation between tail gas treatment tank, spraying mechanism, slow flow structure and auxiliary exhaust mechanism, slow flow structure can increase the residence time of tail gas in tail gas treatment tank, and then facilitate spraying mechanism to spray neutralization treatment to tail gas, to improve the neutralization efficiency of hydrogen chloride, while slow flow structure can further slow down the flow speed of tail gas in the process of neutralization, so that hydrogen chloride in tail gas can reach standard discharge, to reduce the influence on environment, improved practicality.

Description

Technical Field

[0001] This utility model relates to the technical field of exhaust gas treatment equipment, specifically a chlorinated exhaust gas treatment device. Background Technology

[0002] During the chlorination process, a large amount of complex chlorinated tail gas is generated. This tail gas contains not only high concentrations of inorganic pollutants such as hydrogen chloride (HCl) and chlorine (Cl2), but also poses a serious threat to the atmospheric environment, human health and production equipment if directly emitted. Traditional chlorinated tail gas treatment methods often use water absorption to recover hydrochloric acid or alkaline absorption to neutralize it, and high-temperature incineration of inert chlorine gas, which can effectively remove toxic gases from the chlorinated tail gas.

[0003] However, burning inert gases produces a large amount of hydrogen chloride gas. If the hydrogen chloride content in the emitted gas exceeds the standard, it will have an adverse impact on the environment and pose a huge environmental safety risk. Utility Model Content

[0004] The purpose of this invention is to provide a chlorinated tail gas treatment device that improves the neutralization effect of hydrogen chloride gas by increasing the contact time between hydrogen chloride gas and alkaline solution, thereby reducing the hydrogen chloride content in the exhaust gas and ensuring that the hydrogen chloride content in the exhaust gas meets the standards, thus reducing environmental pollution and solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a chlorinated tail gas treatment device, comprising:

[0006] An exhaust gas treatment tank and a slow-flow structure disposed in the inner cavity of the exhaust gas treatment tank. The air inlet end of the inner cavity of the exhaust gas treatment tank is provided with a packing filter plate. The slow-flow structure increases the residence time of the exhaust gas in the exhaust gas treatment tank to neutralize the exhaust gas.

[0007] The top of the exhaust gas treatment tank is equipped with a spraying mechanism, which sprays the exhaust gas inside the top of the exhaust gas treatment tank to neutralize it.

[0008] The top of the exhaust gas treatment tank is equipped with an auxiliary exhaust mechanism, which guides the exhaust gas to discharge the neutralized exhaust gas.

[0009] Preferably, the slow-flow structure includes multiple sets of slow-flow groups, multiple sets of slow-flow filter plates, and a third baffle. The multiple sets of slow-flow groups are alternately arranged with the multiple sets of slow-flow filter plates. The third baffle is arranged on one side of the slow-flow group near the outlet end, and a third air hole for exhaust gas to pass through is opened at the lower end of one side of the third baffle.

[0010] Preferably, the slow-flow group includes two sets of first baffles and second baffles arranged at equal intervals. The second baffle is disposed between the two sets of first baffles. A first air hole is opened at the upper end of one side of each of the two sets of first baffles, and a second air hole is opened at the lower end of one side of the second baffle. A serpentine channel for exhaust gas to pass through is formed between the two sets of first baffles and second baffles.

[0011] Preferably, the spraying mechanism includes a water pump and multiple sets of arc-shaped pipes. The multiple sets of arc-shaped pipes are all installed on the top of the exhaust gas treatment tank, and multiple sets of nozzles penetrating into the inner cavity of the exhaust gas treatment tank are installed on the outer side of each set of arc-shaped pipes. The water pump outlet is provided with a liquid supply main pipe, and one end of the liquid supply main pipe is provided with a water distribution pipe connected to the multiple sets of arc-shaped pipes.

[0012] Preferably, a water storage tank is provided below the exhaust gas treatment tank, and multiple sets of support columns are installed on the upper surface of the water storage tank, and the multiple sets of support columns are fixedly connected to the bottom of the exhaust gas treatment tank.

[0013] Preferably, the auxiliary exhaust mechanism includes an exhaust pipe fixedly connected to the top of the exhaust gas treatment tank, a fan is installed inside the exhaust pipe, the lower end of the exhaust pipe extends into the inner cavity of the exhaust gas treatment tank and is fixedly connected to an inner pipe, multiple sets of side holes are opened on the outer side of the inner pipe, and a hydrogen chloride detector is installed at the lower end of the inner pipe, and an air inlet pipe is provided at one end of the exhaust gas treatment tank.

[0014] Preferably, the bottom of the exhaust gas treatment tank is provided with a wastewater diversion channel, one end of the bottom of the wastewater diversion channel is provided with a drain valve pipe, and the other end of the exhaust gas treatment tank is provided with a drain pipe coaxial with the lower end axis of the second air hole.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention mainly utilizes the cooperation between the exhaust gas treatment tank, the spraying mechanism, the slow-flow structure, and the auxiliary exhaust mechanism. The slow-flow structure increases the residence time of the exhaust gas in the exhaust gas treatment tank, thereby facilitating the spraying mechanism to perform spraying and neutralization treatment on the exhaust gas, thus improving the neutralization efficiency of hydrogen chloride. At the same time, during the neutralization process, the slow-flow structure further slows down the flow speed of the exhaust gas, so that the hydrogen chloride in the exhaust gas can meet the emission standards, thereby reducing the impact on the environment and improving practicality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional three-dimensional structural diagram of the present invention;

[0019] Figure 3 This is a schematic diagram of the planar structure of the present invention;

[0020] Figure 4 This is a schematic diagram of the slow-flow structure of this utility model.

[0021] In the diagram: 1. Water storage tank; 2. Exhaust gas treatment tank; 3. Spraying mechanism; 31. Water pump; 32. Main liquid supply pipe; 33. Water distribution pipe; 34. Arc-shaped pipe; 35. Sprayer head; 4. Slow-flow structure; 41. Slow-flow group; 411. First baffle; 412. First vent; 413. Second baffle; 414. Second vent; 42. Slow-flow filter screen; 43. Third baffle; 44. Third vent; 5. Auxiliary exhaust mechanism; 51. Inner pipe; 52. Side hole; 53. Exhaust pipe; 54. Fan; 6. Inlet pipe; 7. Packed filter plate; 8. Wastewater diversion channel; 9. Drain valve pipe; 10. Drain pipe; 11. Support column; 12. Hydrogen chloride detector. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1-4 This utility model provides a technical solution: a chlorinated tail gas treatment device, including a tail gas treatment tank 2 and a slow-flow structure 4 disposed in the inner cavity of the tail gas treatment tank 2. The air inlet end of the inner cavity of the tail gas treatment tank 2 is provided with a packing filter plate 7. The packing is polypropylene stepped ring packing. Polypropylene stepped ring packing has a large specific surface area and high mass transfer efficiency. The slow-flow structure 4 increases the residence time of the tail gas in the tail gas treatment tank 2 to neutralize the tail gas.

[0024] The top of the exhaust gas treatment tank 2 is equipped with a spraying mechanism 3, which sprays the exhaust gas inside the top of the exhaust gas treatment tank 2 to neutralize the exhaust gas. The exhaust gas treatment tank 2 is made of 304 stainless steel.

[0025] An auxiliary exhaust mechanism 5 is provided on the top of the exhaust gas treatment tank 2. The auxiliary exhaust mechanism 5 guides the exhaust gas to discharge the neutralized exhaust gas.

[0026] In this embodiment, the slow flow structure 4 includes multiple sets of slow flow groups 41, multiple sets of slow flow filter plates 42 and a third baffle 43. The multiple sets of slow flow groups 41 are alternately arranged with the multiple sets of slow flow filter plates 42. The third baffle 43 is arranged on one side of the slow flow group 41 near the outlet end, and a third air hole 44 for the exhaust gas to pass through is opened at the lower end of one side of the third baffle 43.

[0027] The slow-flow filter plate 42 can further filter out tiny impurities in the exhaust gas. The third baffle 43 and the preceding slow-flow group 41 form a stepped slow flow, which further extends the residence time of the exhaust gas, makes the contact between the exhaust gas and the alkaline solution more sufficient, enhances the neutralization effect of HCl, and ensures that the HCl content in the treated exhaust gas is more likely to meet the standard.

[0028] Furthermore, the slow-flow group 41 includes two sets of first baffles 411 and second baffles 413 arranged at equal intervals. The second baffles 413 are arranged between the two sets of first baffles 411. A first air hole 412 is opened on the upper end of one side of each of the two sets of first baffles 411, and a second air hole 414 is opened on the lower end of one side of the second baffle 413. A serpentine channel for exhaust gas to pass through is formed between the two sets of first baffles 411 and second baffles 413. The baffles and filter screen are made of PpH (polypropylene homopolymer), which is resistant to acid and alkali corrosion, high temperature, and suitable for chlorinated exhaust gas environment.

[0029] By extending the residence time of the chlorinated tail gas in the tail gas treatment tank 2, the rapid passage of the tail gas through the tail gas treatment tank 2 can be prevented from causing insufficient neutralization. At the same time, the first vent 412, the second vent 414 and the third vent 44 can guide the tail gas to flow in an orderly manner, prevent the tail gas from accumulating in the tail gas treatment tank 2 and forming local high pressure, ensure the stability of the device operation, and avoid the problem of poor exhaust due to pressure fluctuations.

[0030] Preferably, the spraying mechanism 3 includes a water pump 31 and multiple sets of arc-shaped pipes 34. The multiple sets of arc-shaped pipes 34 are all installed on the top of the exhaust gas treatment tank 2, and multiple sets of nozzles 35 that penetrate into the inner cavity of the exhaust gas treatment tank 2 are installed on the outer side of each set of arc-shaped pipes 34. The water outlet end of the water pump 31 is provided with a liquid supply main pipe 32, and one end of the liquid supply main pipe 32 is provided with a water distribution pipe 33 connected to the multiple sets of arc-shaped pipes 34. The nozzles 35 are atomizing nozzles 35 with an atomization particle size of 50-100μm to maximize the gas-liquid contact area. The distance between adjacent nozzles 35 is 15-20cm, and the spray angle is 120°.

[0031] By combining the arc-shaped tube 34 with multiple nozzles 35, the alkaline solution forms a multi-angle spray area within the exhaust gas treatment tank 2, avoiding the problem of local exhaust gas not contacting the solution that exists in traditional single-tube spraying. At the same time, the atomizing nozzles 35 can disperse the alkaline solution into tiny droplets, greatly increasing the gas-liquid contact area to improve the HCl neutralization efficiency and reduce the amount of unreacted HCl residue.

[0032] Secondly, a water storage tank 1 is installed below the exhaust gas treatment tank 2. Multiple sets of support columns 11 are installed on the upper surface of the water storage tank 1, and all sets of support columns 11 are fixedly connected to the bottom of the exhaust gas treatment tank 2. The alkaline solution in the water storage tank 1 is a sodium hydroxide solution with a mass concentration of 5%-10%. A water pump 31 is installed in the water storage tank 1 to continuously supply water to the exhaust gas treatment tank 2, thereby increasing the continuous neutralization time of the exhaust gas and ensuring the treatment effect of the exhaust gas.

[0033] In a further preferred embodiment, the auxiliary exhaust mechanism 5 includes an exhaust pipe 53 fixedly connected to the top of the exhaust gas treatment tank 2, a fan 54 is provided inside the exhaust pipe 53, the lower end of the exhaust pipe 53 extends into the inner cavity of the exhaust gas treatment tank 2 and is fixedly connected to an inner pipe 51, multiple sets of side holes 52 are opened on the outer side of the inner pipe 51, and a hydrogen chloride detector 12 is installed at the lower end of the inner pipe 51. An air inlet pipe 6 is provided at one end of the exhaust gas treatment tank 2. The hydrogen chloride detector 12 has a detection range of 0-100ppm, an accuracy of ±5ppm, and an alarm threshold set to 10ppm. The fan 54 is a centrifugal fan.

[0034] The blower 54 provides stable exhaust power, preventing the treated exhaust gas from stagnating in the exhaust gas treatment tank 2. The cooperation between the inner pipe 51 and the side hole 52 allows the exhaust gas to enter the exhaust pipe 53 evenly from the tank. The hydrogen chloride detector 12 realizes real-time monitoring and feedback of the HCl content in the treated exhaust gas. When the HCl content is detected to be close to or exceed the national standard threshold, it can promptly prompt the operator to adjust the parameters, such as increasing the spray liquid flow rate and reducing the exhaust gas inlet speed, to avoid excessive exhaust gas emissions and improve the environmental performance of the device.

[0035] In addition, a wastewater diversion trough 8 is provided at the bottom of the exhaust gas treatment tank 2. A drain valve pipe 9 is provided at one end of the bottom of the wastewater diversion trough 8, and a drain pipe 10 coaxial with the lower axis of the second air hole 414 is provided at the other end of the exhaust gas treatment tank 2. A pH sensor is added to the water storage tank 1. When the wastewater pH is ≥7, that is, the alkalinity is not completely consumed, it is circulated to the spray mechanism 3 through the water pump 31. When the wastewater pH is <5, it is strongly acidic and the neutralization ability fails. It is discharged into the plant wastewater treatment system through the drain valve pipe 9.

[0036] The filter plate 7 is made of polypropylene stepped ring packing, which provides a larger gas-liquid contact area, allowing the exhaust gas to react secondary with the liquid film formed after spraying on the surface of the packing, further neutralizing residual HCl. Meanwhile, the wastewater diversion tank 8 and the pipeline can collect hydrochloric acid wastewater in an orderly manner, avoiding the accumulation of wastewater at the bottom of the tank and causing equipment corrosion. At the same time, the wastewater can be recycled or discharged into the subsequent treatment system based on the pH value. For example, if the pH is ≥7, it can be reused for spraying, reducing secondary pollution and improving the resource utilization rate and overall environmental friendliness of the device.

[0037] During operation, the exhaust gas from the incinerator passes through the inlet pipe 6 and then through the packing filter plate 7. The spray liquid film adhering to the surface of the packing filter plate 7 comes into contact with the exhaust gas, performing preliminary neutralization. The remaining chlorinated exhaust gas passes sequentially through multiple sets of slow-flow groups 41 and the third baffle 43, and enters the outlet of the exhaust gas treatment tank 2 through the third vent 44 of the third baffle 43. During this process, the exhaust gas passes through the first baffle 411 and the second baffle 413 of the multiple sets of slow-flow groups 41, extending the exhaust gas's path and thus increasing the neutralization time with water. This improves the neutralization efficiency of HCl in the exhaust gas. The slow-flow filter plate 42 further reduces the flow speed of the exhaust gas, thereby increasing the neutralization time of the subsequent exhaust gas flow. At the same time, the 5%-10% sodium hydroxide solution in the water tank 1 is drawn by the water pump 31 and transported to the arc pipe 34 through the liquid supply main pipe 32 and the water distribution pipe 33. It is then sprayed into tiny droplets by the atomizing nozzle 35, forming a fully covered spray area in the exhaust gas treatment tank 2. The exhaust gas comes into full contact with the alkaline droplets, so that HCl is neutralized into sodium chloride.

[0038] The treated exhaust gas, powered by the fan 54 of the auxiliary exhaust mechanism 5, enters the exhaust pipe 53 evenly from the side hole 52 of the inner pipe 51. During this period, the hydrogen chloride detector 12 monitors the HCl content in the exhaust gas in real time. If it is ≤10ppm, it meets the standard and is discharged directly. If it exceeds the standard, the spray parameters are adjusted, such as increasing the solution flow rate. The stable air pressure of the fan 54 ensures that the exhaust gas does not stagnate or fluctuate.

[0039] The hydrochloric acid-containing wastewater generated by spraying flows along the tank wall into the wastewater diversion channel 8, and is then introduced into the water storage tank 1 through the drain valve pipe 9. The pH sensor in the water storage tank 1 monitors the pH value of the wastewater. When the pH is ≥7, it is recycled for spraying to save on chemicals. When the pH is <5, it is discharged into the factory wastewater treatment system to avoid secondary pollution.

[0040] 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 chlorinated tail gas treatment device, characterized in that, include: The exhaust gas treatment tank (2) and the slow flow structure (4) provided in the inner cavity of the exhaust gas treatment tank (2) are provided with a packing filter plate (7) at the air inlet end of the inner cavity of the exhaust gas treatment tank (2). The slow flow structure (4) increases the residence time of the exhaust gas in the exhaust gas treatment tank (2) to neutralize the exhaust gas. The exhaust gas treatment tank (2) is equipped with a spraying mechanism (3) at the top, which sprays the exhaust gas inside the top of the exhaust gas treatment tank (2) to neutralize the exhaust gas. The exhaust gas treatment tank (2) is provided with an auxiliary exhaust mechanism (5) at the top, through which the exhaust gas is diverted to discharge the neutralized exhaust gas.

2. The chlorinated tail gas treatment device according to claim 1, characterized in that: The slow-flow structure (4) includes multiple slow-flow groups (41), multiple slow-flow filter plates (42), and a third baffle (43). The multiple slow-flow groups (41) are alternately arranged with the multiple slow-flow filter plates (42). The third baffle (43) is arranged on one side of the slow-flow group (41) near the outlet end, and a third air hole (44) for the exhaust gas to pass through is opened at the lower end of one side of the third baffle (43).

3. The chlorinated tail gas treatment device according to claim 2, characterized in that: The slow-flow group (41) includes two sets of first baffles (411) and second baffles (413) arranged at equal intervals. The second baffles (413) are arranged between the two sets of first baffles (411). A first air hole (412) is opened on the upper end of one side of each of the two sets of first baffles (411), and a second air hole (414) is opened on the lower end of one side of the second baffle (413). A serpentine channel for exhaust gas to pass through is formed between the two sets of first baffles (411) and second baffles (413).

4. The chlorinated tail gas treatment device according to claim 1, characterized in that: The spraying mechanism (3) includes a water pump (31) and multiple sets of arc-shaped pipes (34). The multiple sets of arc-shaped pipes (34) are all installed on the top of the exhaust gas treatment tank (2), and multiple sets of nozzles (35) that penetrate into the inner cavity of the exhaust gas treatment tank (2) are installed on the outside of each set of arc-shaped pipes (34). The water outlet end of the water pump (31) is provided with a liquid supply main pipe (32), and one end of the liquid supply main pipe (32) is provided with a water distribution pipe (33) that is connected to the multiple sets of arc-shaped pipes (34).

5. The chlorinated tail gas treatment device according to claim 1, characterized in that: A water storage tank (1) is provided below the exhaust gas treatment tank (2). Multiple sets of support columns (11) are installed on the upper surface of the water storage tank (1), and the multiple sets of support columns (11) are fixedly connected to the bottom of the exhaust gas treatment tank (2).

6. The chlorinated tail gas treatment device according to claim 1, characterized in that: The auxiliary exhaust mechanism (5) includes an exhaust pipe (53) fixedly connected to the top of the exhaust gas treatment tank (2). A fan (54) is installed inside the exhaust pipe (53). The lower end of the exhaust pipe (53) extends into the inner cavity of the exhaust gas treatment tank (2) and is fixedly connected to an inner pipe (51). Multiple sets of side holes (52) are opened on the outer side of the inner pipe (51), and a hydrogen chloride detector (12) is installed at the lower end of the inner pipe (51). An air inlet pipe (6) is provided at one end of the exhaust gas treatment tank (2).

7. The chlorinated tail gas treatment device according to claim 1, characterized in that: The bottom of the exhaust gas treatment tank (2) is provided with a wastewater diversion trough (8), and a drain valve pipe (9) is provided at one end of the bottom of the wastewater diversion trough (8). The other end of the exhaust gas treatment tank (2) is provided with a drain pipe (10) that is coaxial with the lower end axis of the second air hole (414).

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