A laboratory acidic inorganic chemical tail gas treatment system

Abstract

The utility model provides a laboratory acid inorganic chemical tail gas treatment system, including: a horizontal spray box, an inorganic acid chemical filter box and a centrifugal fan, the air inlet of the horizontal spray box is connected to the exhaust pipe, the air outlet of the horizontal spray box is connected to the air inlet of the inorganic acid chemical filter box through a pipe, the air outlet of the inorganic acid chemical filter box is connected to the air inlet of the centrifugal fan through a pipe, a water tank is installed in the horizontal spray box, a water pump is installed outside the water tank, the water pump is connected to the spray head installed in the horizontal spray box through a pipe, a dehydration demister is installed at the air outlet of the horizontal spray box, a water collection tank is installed below the dehydration demister, and the water collection tank is connected to the water tank through a pipe. This system adopts the comprehensive use of the horizontal spray box full water dissolution method and the inorganic acid chemical filter box, which greatly reduces the operating cost while ensuring the filtering effect, and deeply and effectively filters the acid chemical polluted gas in the exhaust gas.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment equipment, in particular to a laboratory acidic inorganic chemical tail gas treatment system. Background Art

[0002] With the rapid development of the country, people's pursuit of health and improvement of environmental awareness, the country has shifted from rapid development to quality development, which has promoted the rapid development of science and technology and the rapid construction of laboratories. Among them, laboratory waste gas emission treatment has caused more and more laboratory environmental safety issues. The problem of laboratory waste gas treatment has attracted more and more attention. Among them, inorganic acid waste gas, if not properly treated and directly discharged into the air, will have a serious impact on the environment and human health. For example, the human body in SO 2 or NO 2 After being exposed to the gas for a certain period of time, symptoms such as emphysema and bronchitis may occur. People who work in laboratories for a long time are particularly susceptible to it. Inorganic acid waste gases include hydrogen chloride, hydrofluoric acid, hydrogen sulfide, sulfur dioxide, sulfuric acid, nitric acid, etc.

[0003] At present, the most commonly used acid tail gas treatment systems include water-soluble wet scrubbing system (water spray bath), activated carbon physical adsorption filtration system, biological desulfurization system, membrane separation system and other common systems. Among them, the wet scrubbing system uses aqueous solution to wash acidic gases, with an absorption efficiency of up to 90%, and can remove a variety of soluble acidic chemical gases. However, if the water is not changed in time, the acid concentration of the water used for washing will increase, which is easy to cause secondary pollution, and the acidic wastewater produced needs to be treated before it can be discharged into the municipal pipeline; activated carbon physical adsorption filtration has a certain adsorption effect on acidic gases, but its life is short, and it has no obvious effect on volatile inorganic acidic chemical gases, and requires special hazardous waste treatment after its life ends; dry chemical filtration with a single chemical adsorption reaction is achieved by using special acid gas filtration materials to absorb Chemical neutralization and redox reactions occur simultaneously, with high filtration efficiency. The salt substances formed do not produce hazardous waste, but the maintenance cost of replacing chemical filter media is very high; the biological desulfurization system uses microbial redox reactions to remove acidic gases. Although it can treat a variety of acidic gases such as sulfur-containing compounds, it is sensitive to gas components and temperature, and the treatment efficiency is relatively low; the membrane separation system uses selective semipermeable membranes to separate acidic gases. Although it can highly separate acidic components and does not produce wastewater, the membrane has a limited service life, and the investment and operating costs are high. In particular, it occupies a large area and is not suitable for laboratory waste gas treatment. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the utility model proposes a laboratory acidic inorganic chemical tail gas treatment system, which adopts a comprehensive use of a horizontal spray box full water dissolution method and an inorganic acidic chemical filter box. Under the premise of ensuring the filtering effect, it greatly reduces the operating cost and deeply and effectively filters the acidic chemical pollution gas in the exhaust gas.

[0005] To realize the above technical scheme, the utility model provides a laboratory acidic inorganic chemical tail gas treatment system, comprising: a horizontal spray box, an inorganic acidic chemical filter box and a centrifugal fan, the air inlet of the horizontal spray box is connected to the exhaust gas pipeline, the air outlet of the horizontal spray box is connected to the air inlet of the inorganic acidic chemical filter box through a pipeline, the air outlet of the inorganic acidic chemical filter box is connected to the air inlet of the centrifugal fan through a pipeline, a water tank is installed in the horizontal spray box, a water pump is installed outside the water tank, the water pump is connected to the spray head installed in the horizontal spray box through a pipeline, a dehydration demister is installed at the air outlet in the horizontal spray box, a water collection tank is installed below the dehydration demister, the water collection tank is connected to the water tank through a pipeline, and a plurality of inorganic acidic chemical filter modules arranged in a staggered manner are installed in the inorganic acidic chemical filter box.

[0006] In the above technical scheme, during actual operation, a centrifugal fan draws chemical waste gas from the laboratory room into a horizontal spray box in the waste gas treatment system. The water in the water tank is transported to the spray head through a water pump, and the flowing water is dispersed into small water droplets, which are fully contacted with the chemical waste gas in the air, and 80-90% of the acidic waste gas is dissolved in the water. The waste gas passes through a dehydration demister to remove water vapor in the gas, reducing the amount of water entering the inorganic acidic chemical filter box, and then enters the inorganic acidic chemical filter module in the inorganic acidic chemical filter box to deeply treat the acidic chemical waste gas, and treats the remaining 10% to 20% of the acidic waste gas, and then discharges it to the outside through a centrifugal fan.

[0007] Preferably, a spray baffle is correspondingly arranged in front of each spray head in the horizontal spray box, and the spray baffle is located above the open water tank. In actual operation, most of the water drops can be blocked by the spray baffle and flow naturally into the water tank.

[0008] Preferably, each inorganic acidic chemical filtration module is correspondingly equipped with a primary filter, which can filter chemical exhaust gas and particulate pollutants at the same time to ensure the filtering effect.

[0009] Preferably, a sewage pipe extending to the outside of the horizontal spray box is provided below the water tank, and a timing solenoid valve is installed on the sewage pipe to realize regular automatic sewage discharge.

[0010] Preferably, a float valve and a low liquid level alarm are installed in the water tank. When the water level is lower than the position of the float valve, the tap water is automatically opened to allow the tap water to flow into the water tank, thereby achieving water replacement. When the water level in the water tank is lower than the low liquid level alarm, the timing solenoid valve is powered off to prevent the water pump from idling when the water volume reaches a certain level, thereby preventing the water pump from burning out.

[0011] Preferably, an electric control box is installed on one side of the water tank in the horizontal spray box, and the electric control box is electrically connected to the float valve, the low liquid level alarm, and the water pump to achieve automatic control of the float valve, the low liquid level alarm, and the water pump.

[0012] The beneficial effect of a laboratory acidic inorganic chemical tail gas treatment system provided by the utility model is that the laboratory acidic inorganic chemical tail gas treatment system has a simple structure and a reasonable design. It adopts a horizontal spray box full water dissolution method and an inorganic acidic chemical filter box. Under the premise of ensuring the filtering effect, the operating cost is greatly reduced, and the acidic chemical polluted gas in the exhaust gas is deeply and effectively filtered. In actual operation, the centrifugal fan extracts chemical waste gas from the laboratory room to the horizontal spray box in the exhaust gas treatment system, and the water in the water tank is transported to the spray head through a water pump, and the flowing water is dispersed into small water droplets, which are fully contacted with the chemical waste gas in the air, and 80-90% of the acidic waste gas is dissolved in the water. The waste gas passes through a dehydration demister to remove water vapor in the gas, reduce the water entering the inorganic acidic chemical filter box, and then enters the inorganic acidic chemical filter module in the inorganic acidic chemical filter box to deeply treat the acidic chemical waste gas, treat the remaining 10% to 20% of the acidic waste gas, and then discharge it to the outside through the centrifugal fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 It is the work flow chart of the utility model.

[0015] In the figure: 1. horizontal spray box; 2. spray head; 3. spray baffle; 4. dehydration demister; 5. air outlet of horizontal spray box; 6. air inlet of inorganic acid chemical filter box; 7. inorganic acid chemical filter box; 8. air outlet of inorganic acid chemical filter box; 9. centrifugal fan; 10. inorganic acid chemical filter module; 11. primary filter; 12. water collection tank; 13. timing solenoid valve; 14. low liquid level alarm; 15. water tank; 16. water pump; 17. electric control box; 18. air inlet of horizontal spray box; 19. float valve. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. All other embodiments obtained by ordinary personnel in this field without creative work are within the scope of protection of the utility model.

[0017] Embodiment: A laboratory acidic inorganic chemical tail gas treatment system.

[0018] Reference Figure 1 and Figure 2 As shown, a laboratory acidic inorganic chemical tail gas treatment system includes: a horizontal spray box 1, an inorganic acidic chemical filter box 7 and a centrifugal fan 9, wherein the air inlet 18 of the horizontal spray box is connected to the exhaust pipe, the air outlet 5 of the horizontal spray box is connected to the air inlet 6 of the inorganic acidic chemical filter box through a pipeline, and the air outlet 8 of the inorganic acidic chemical filter box is connected to the air inlet of the centrifugal fan 9 through a pipeline. During actual operation, the centrifugal fan 9 draws chemical waste gas from the laboratory room into the horizontal spray box 1 in the waste gas treatment system for spraying treatment, and then enters the inorganic acidic chemical filter box 7 for deep treatment, and then is discharged to the outside through the centrifugal fan 9.

[0019] A water tank 15 is installed in the horizontal spray box 1. A sewage pipe extending to the outside of the horizontal spray box 1 is arranged below the water tank 15. A timing solenoid valve 13 is installed on the sewage pipe to achieve regular automatic sewage discharge. A float valve 19 and a low liquid level alarm 14 are installed in the water tank 15. When the water level is lower than the position of the float valve 19, the tap water is automatically opened to allow the tap water to flow into the water tank 15, thereby achieving water replacement. When the water level of the water tank 15 is lower than the low liquid level alarm 14, the timing solenoid valve is powered off to prevent the water pump 16 from idling when the water volume reaches a certain level and burning the water pump 16.

[0020] A water pump 16 is installed outside the water tank 15, and the water pump 16 is connected to the spray head 2 installed in the horizontal spray box 1 through a pipeline. A spray baffle 3 is correspondingly arranged in front of each spray head 2, and the spray baffle 3 is located above the open water tank 15. A dehydration demister 4 is installed at the air outlet 5 of the horizontal spray box, and a water collection tank 12 is installed below the dehydration demister 4. The water collection tank 12 is connected to the water tank 15 through a pipeline. In actual operation, the centrifugal fan 9 extracts chemical waste gas from the laboratory to the waste gas treatment system In the horizontal spray box 1, the water in the water tank 15 is pumped out by the water pump 16 and transported to the spray head 2. The flowing water is dispersed into small water droplets by the spray head 2, which are fully contacted with the chemical waste gas in the air, and 80-90% of the acid waste gas is dissolved in the water. At the same time, most of the water droplets are blocked by the spray baffle 3, and naturally flow into the water tank 15. After the waste gas passes through the dehydration demister 4 to remove the water vapor in the gas, it is transported to the inorganic acid chemical filter box 7 through the air outlet 5 of the horizontal spray box, thereby reducing the water entering the inorganic acid chemical filter box 7. An electric control box 17 is installed on one side of the water tank 15 in the horizontal spray box 1. The electric control box 17 is electrically connected to the float valve 19, the low liquid level alarm 14, and the water pump 16, so as to realize the automatic control of the float valve 19, the low liquid level alarm 14, and the water pump 16.

[0021] The inorganic acid chemical filter box 7 is equipped with a plurality of staggered inorganic acid chemical filter modules 10, so that the exhaust gas can fully contact the staggered inorganic acid chemical filter modules 10 when passing through the inorganic acid chemical filter box 7, and treat the remaining 10% to 20% of the acidic exhaust gas. A primary filter 11 is installed on each inorganic acid chemical filter module 10, and the primary filter 11 can filter the chemical exhaust gas and the particulate pollutants at the same time to ensure the filtering effect.

[0022] The acidic inorganic chemical tail gas treatment system of this laboratory has a simple structure and reasonable design. It adopts a comprehensive use of the horizontal spray box 1 full water dissolution method and the inorganic acid chemical filter box 7. Under the premise of ensuring the filtering effect, it greatly reduces the operating cost and deeply and effectively filters the acidic chemical pollution gas in the exhaust gas. During actual operation, the centrifugal fan 9 extracts chemical waste gas from the laboratory room into the horizontal spray box 1 in the waste gas treatment system, and the water in the water tank 15 is pumped out by the water pump 16 and transported to the spray head 2. The flowing water is dispersed into small water droplets by the spray head 2, which are fully contacted with the chemical waste gas in the air, and 80-90% of the acid waste gas is dissolved in the water. At the same time, most of the water droplets are blocked by the spray baffle 3 and naturally flow into the water tank 15. After the waste gas passes through the dehydration demister 4 to remove the water vapor in the gas, it is transported to the inorganic acid chemical filter box 7 through the air outlet 5 of the horizontal spray box to reduce the water entering the inorganic acid chemical filter box 7, and then enters the inorganic acid chemical filter box 7, and is deeply treated by a plurality of staggered inorganic acid chemical filter modules 10 installed in the inorganic acid chemical filter box 7 to treat the remaining 10% to 20% of the acid waste gas, and then discharged to the outside through the centrifugal fan.

[0023] The utility model adopts a horizontal spray box 1, and the water changing time of the water tank 15 can be set according to the situation of the laboratory. The automatic water changing ensures the deacidification effect, and the water mist in the air flow does not form secondary pollution. At the same time, a float valve 19 is set to automatically add water, and the low liquid level alarm 14 protects the water pump 16 in time to prevent idling. The inorganic acidic chemical filter module 10 in the inorganic acidic chemical filter box 7 is placed flat in the drawer of the acidic chemical gas filter box 7. The air inlet and outlet ducts with different spacings formed between each row of drawers, the air volume enters from the air inlet duct, passes through the upper and lower layers of the inorganic acidic chemical filter module 10 and the primary filter 11, and the air volume is gradually reduced. The spacing between the upper and lower inorganic acidic chemical filter modules 10 in different rows is gradually reduced to ensure that the wind speed between each level of the air inlet duct is consistent; similarly, the spacing between the inorganic acidic chemical filter module 10 and the bellows wall in each row of air ducts is gradually increased to ensure that the wind speed of the same outlet duct is consistent.

[0024] The inorganic acidic chemical filtration module 10 in the utility model has a filter material made of an alumina substrate with uniform micropores, which is infiltrated with strongly oxidizing alkaline chemical reagents such as potassium permanganate, potassium hydroxide, and sodium bicarbonate. These strongly alkaline chemical reagents are firmly attached to the capillary walls of the alumina through molecular penetration. When the inorganic acidic chemical molecules pass through the capillary pores, they react with the hydroxide radicals of the strongly alkaline molecules in the pore walls to generate salt substances, such as potassium chloride, sodium chloride and other salts, which can effectively remove the inorganic acidic chemical gases passing through.

[0025] The utility model is mainly composed of a horizontal spray box 1 and an inorganic acidic chemical filter box 7. The circulating water in the horizontal spray box 1 is regularly replaced and discharged to the wastewater treatment system for treatment before entering the municipal drainage channel. Since most inorganic acidic chemical gases are dissolved in water, such as hydrochloric acid, sulfuric acid, nitric acid, sulfur dioxide, hydrogen sulfide, hydrofluoric acid, etc., these inorganic acidic chemical gases can reach a removal rate of 80-90% after passing through the horizontal spray box 1. The remaining 10-20% of the acidic inorganic chemical waste gas that has not been removed is then treated by the inorganic acidic chemical filter box 7. The final chemical waste gas concentration comprehensive removal rate can reach more than 95%, which exceeds the emission standard of the national standard GB 16297-1996 "Comprehensive Emission Standard of Air Pollutants".

[0026] The above is only a preferred embodiment of the present invention, but the present invention should not be limited to the contents disclosed in the embodiment and the drawings, so any equivalent or modification completed without departing from the spirit disclosed in the present invention shall fall within the scope of protection of the present invention.

Claims

1. A laboratory acidic inorganic chemical tail gas treatment system, characterized in that include: A horizontal spray box, an inorganic acidic chemical filter box and a centrifugal fan, wherein the air inlet of the horizontal spray box is connected to the exhaust gas pipe, the air outlet of the horizontal spray box is connected to the air inlet of the inorganic acidic chemical filter box through a pipe, the air outlet of the inorganic acidic chemical filter box is connected to the air inlet of the centrifugal fan through a pipe, a water tank is installed in the horizontal spray box, a water pump is installed outside the water tank, the water pump is connected to the spray head installed in the horizontal spray box through a pipe, a dehydration demister is installed at the air outlet in the horizontal spray box, a water collecting tank is installed below the dehydration demister, the water collecting tank is connected to the water tank through a pipe, and a plurality of inorganic acidic chemical filter modules arranged in a staggered manner are installed in the inorganic acidic chemical filter box.

2. The laboratory acidic inorganic chemical tail gas treatment system according to claim 1, characterized in that: A spray baffle is correspondingly arranged in front of each spray head in the horizontal spray box, and the spray baffle is located above the open water tank.

3. The laboratory acidic inorganic chemical tail gas treatment system according to claim 1, characterized in that: Each inorganic acid chemical filtration module is equipped with a primary filter.

4. The laboratory acidic inorganic chemical tail gas treatment system according to claim 1, characterized in that: A sewage pipe extending to the outside of the horizontal spray box is arranged below the water tank, and a timing solenoid valve is installed on the sewage pipe.

5. The laboratory acidic inorganic chemical tail gas treatment system according to claim 1, characterized in that: A float valve and a low liquid level alarm are installed in the water tank.

6. The laboratory acidic inorganic chemical tail gas treatment system according to claim 5, characterized in that: An electric control box is installed on one side of the water tank in the horizontal spray box, and the electric control box is electrically connected to the float valve, the low liquid level alarm, and the water pump.

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