CN111530255B - Venturi effect-based waste gas treatment system and method - Google Patents
Venturi effect-based waste gas treatment system and method Download PDFInfo
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- CN111530255B CN111530255B CN202010363638.7A CN202010363638A CN111530255B CN 111530255 B CN111530255 B CN 111530255B CN 202010363638 A CN202010363638 A CN 202010363638A CN 111530255 B CN111530255 B CN 111530255B
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
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Abstract
The invention discloses a waste gas treatment system based on Venturi effect, which utilizes the Venturi principle to lead a vacuum pump set, a Venturi tube and secondary treatment liquid to form a circulating loop, the flow in the Venturi tube is reduced from rough to fine, the flow speed is accelerated through a conical convergence part, a negative pressure is formed in a cylindrical part, alkaline primary treatment liquid is sucked into a neutralization tank body by utilizing the negative pressure, then acidic waste gas of an external workshop air cabinet waste gas source is sucked into the neutralization tank body through the negative pressure to be subjected to primary neutralization treatment with the primary treatment liquid, the primarily treated gas enters the Venturi tube under the action of the negative pressure to be fully mixed with the secondary treatment liquid flowing at high speed in the circulating loop, the waste gas (acidic gas) of the external workshop air cabinet waste gas source is fully purified after primary treatment and secondary treatment, and the effect is obvious when being combined with the waste gas treatment system and method based on the Venturi effect, the efficiency of waste gas absorption treatment is improved, need not the burning simultaneously, reduce the operation danger coefficient.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a system and a method for treating waste gas based on a Venturi effect.
Background
The existing waste gas treatment methods mainly comprise two methods, namely a spraying method and a combustion method. Spraying: the acidic or alkaline waste gas is neutralized and absorbed in a spraying mode, the waste gas passes through the spraying absorption device from bottom to top in a single way, and then is directly discharged into the atmosphere after being dewatered and demisted by the liquid removal net, although the purification efficiency reaches 95 percent, about 5 percent of the acidic or alkaline waste gas is still not purified, the treatment time is long, the occupied area is large, and the investment cost is high. The direct combustion method comprises the following steps: the organic waste gas is introduced into the combustion chamber and directly contacted with flame for combustion and decomposition, so that the danger coefficient is high. Thus, a method is provided herein that has a fast absorption rate, a low risk factor, and a small footprint.
Disclosure of Invention
In order to solve the problems of the prior art, the primary object of the present invention is to provide a venturi effect-based exhaust gas treatment system, comprising a primary treatment device and a secondary treatment device, wherein the primary treatment device comprises a primary neutralization tank and a primary treatment liquid container, the primary neutralization tank is provided with a primary treatment liquid input end, an exhaust gas input end and a primary treatment gas output end, the output end of the primary treatment liquid container is communicated with the primary treatment liquid input end through a pipeline, the output end of the primary treatment liquid container is provided with a first valve, the exhaust gas input end is lower than the primary treatment gas output end, the exhaust gas input end is communicated with the output end of an external workshop air cabinet exhaust gas source through a pipeline, the exhaust gas input end is provided with a third valve, and the primary treatment gas output end is communicated with the secondary treatment device through a pipeline, an induced draft fan is arranged at the output end of the external workshop air cabinet waste gas source; the secondary treatment equipment comprises a Venturi tube, a vacuum pump unit and a secondary neutralization box, wherein the secondary neutralization box is provided with a secondary treatment liquid output end, the input end of the vacuum pump unit is communicated with the secondary treatment liquid output end through a pipeline, the output end of the vacuum pump unit is communicated with the input end of the Venturi tube, the output end of the Venturi tube is communicated with the input end of the secondary neutralization box, the Venturi tube sequentially comprises a cylindrical part, a conical convergence part and a cylindrical throat part from the input end to the output end, a primary treatment gas input end is further arranged on the side of the cylindrical part, the primary treatment gas output end is communicated with the primary treatment gas input end through a pipeline, and the primary treatment gas output end is provided with a second valve; the second-stage neutralization tank further comprises a waste gas output end used for communicating an external waste gas treatment system, a liquid inlet used for adding the second-stage treatment liquid and an emptying pipe used for emptying the second-stage treatment liquid, and the emptying pipe is provided with a fourth valve.
Preferably, the secondary treatment equipment further comprises a gas tank, wherein an output end of the gas tank is communicated with an input end of the venturi tube, an input end of the gas tank is communicated with the primary treatment gas output end, and the second valve is positioned between the input end of the gas tank and the primary treatment gas output end.
Preferably, the primary neutralization tank is further provided with a waste liquid discharge pipe for outputting the primary treatment liquid to the outside.
The second purpose of the invention is to provide an exhaust gas treatment fluid, which is prepared by the following steps: dissolving urea peroxide and an acid mist absorbent in distilled water, then carrying out high-speed stirring treatment until the urea peroxide and the acid mist absorbent are completely dissolved, standing and cooling to room temperature, then adding an acid mist settling agent, carrying out high-speed stirring treatment until the acid mist settling agent is completely dissolved, standing and cooling to room temperature, and controlling the volumes of the urea peroxide, the acid mist absorbent and the acid mist settling agent to be 6-7%, 15-16% and 5% respectively based on the total volume ratio of the solution.
Preferably, the acid mist absorbent is composed of one or more of sodium hydroxide, sodium carbonate, high-efficiency composite alkali, potassium hydroxide, calcium carbonate and sodium chloride.
Preferably, the acid mist settling agent is composed of one or more of sodium carbonate, potassium carbonate, cationic polyacrylamide, diethanolamine, tetramethylammonium hydroxide or anionic polyacrylamide.
The third purpose of the present invention is to provide an exhaust gas treatment method, which adopts the exhaust gas treatment system based on the venturi effect, and comprises the following steps:
step (1): dissolving sodium hydroxide in distilled water, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, then adding an acid mist settling agent, then carrying out high-speed stirring treatment until the acid mist settling agent is completely dissolved, standing and cooling to room temperature, and controlling the volume contents of the sodium hydroxide and the acid mist settling agent to be 30% and 5% respectively based on the total volume ratio of the solution to obtain a primary treatment solution;
step (2): adding a secondary treatment liquid into a secondary neutralization tank, wherein the secondary treatment liquid is a waste gas treatment liquid provided by the second aim of the invention;
and (3): enabling the vacuum pump unit to be in a stop state, adding primary treatment liquid into a primary treatment liquid container, and controlling the volume ratio of the primary treatment liquid to the secondary treatment liquid to be 1: 2;
and (4): opening the first valve and closing the third valve; opening a second valve, starting a vacuum pump unit, wherein the flow in the Venturi tube is reduced from thick to thin, the flow speed is accelerated through a conical convergence part, a cylindrical part forms negative pressure, and primary treatment liquid is sucked into a neutralization tank body by the negative pressure;
and (5): and closing the first valve, opening the third valve, and leading the waste gas of the waste gas source of the external workshop air cabinet to the neutralization tank through the waste gas input end under the action of negative pressure.
Preferably, the acid mist settling agent is composed of one or more of sodium hydroxide, sodium carbonate, high-efficiency composite alkali, potassium hydroxide, calcium carbonate and sodium chloride.
Preferably, the acid mist settling agent is composed of any two or more of sodium carbonate, potassium carbonate, cationic polyacrylamide, diethanolamine, tetramethylammonium hydroxide or anionic polyacrylamide.
Compared with the prior art, the invention has the beneficial effects that:
the vacuum pump set, the venturi tube and the secondary treatment liquid form a circulation loop, the flow in the venturi tube is reduced from thick to thin, the flow speed is accelerated by the cone convergent part, the cylindrical part forms negative pressure, the alkaline primary treatment liquid is sucked into the neutralizing tank body by utilizing the negative pressure, then the acid waste gas of the external workshop air cabinet waste gas source is sucked into the neutralization tank body by negative pressure to be subjected to primary neutralization treatment with primary treatment liquid, the gas after primary treatment enters the Venturi tube under the action of negative pressure to be fully mixed with secondary treatment liquid flowing at high speed in the circulation loop, the waste gas (acid gas) of the external workshop air cabinet waste gas source is fully purified after primary treatment and secondary treatment, the combination of the Venturi effect based waste gas treatment system and the Venturi effect based waste gas treatment method has obvious use effect, improves the waste gas absorption treatment efficiency, simultaneously does not need combustion, and reduces the operation risk coefficient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the exhaust treatment system of the present invention;
FIG. 2 is a schematic structural view of the venturi of the present invention;
wherein, 1, primary treatment equipment; 2. secondary treatment equipment; 11. a primary neutralization tank; 111. a primary treatment fluid input; 112. an exhaust gas input; 1121. a third valve; 113. a primary treated gas output; 1131. a second valve; 114. a waste liquid discharge pipe; 12. a primary treatment fluid container; 121. a first valve; 122. an output end of the primary treatment fluid container; 31. an induced draft fan; 21. a venturi tube; 211. A cylindrical portion; 212. a conical convergent section; 213. a cylindrical throat; 214. an input end of the venturi tube; 215. an output end of the venturi tube; 216. a primary process gas input; 22. a vacuum pump unit; 23. a secondary neutralization tank; 231. a secondary treatment fluid output end; 232. the input end of the secondary neutralization tank; 233. an exhaust gas output; 234. emptying the pipe; 2341. a fourth valve; 235. a liquid inlet; 24. a gas tank; 241. an output end of the gas tank; 242. an input for a gas tank; 3. and an external workshop air cabinet waste gas source.
Detailed Description
The present invention will now be described in more detail with reference to the following examples, but it should be understood that the invention is not limited to the details of the examples set forth herein. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiments of the present invention will be described below with reference to the accompanying drawings.
Examples 1-8 each show, using fig. 1-2, a venturi-based exhaust gas treatment system comprising a primary treatment device 1 and a secondary treatment device 2, the primary treatment device 1 comprising a primary neutralization tank 11 and a primary treatment liquid container 12, the primary neutralization tank 11 being provided with a primary treatment liquid input 111, the system comprises a waste gas input end 112 and a primary treatment gas output end 113, wherein the output end 122 of a primary treatment liquid container is communicated with the primary treatment liquid input end 111 through a pipeline, the output end 122 of the primary treatment liquid container is provided with a first valve 121, the waste gas input end 112 is lower than the primary treatment gas output end 113, the waste gas input end 112 is communicated with the output end of an external workshop air cabinet waste gas source 3 through a pipeline, the waste gas input end 112 is provided with a third valve 1121, the primary treatment gas output end 113 is communicated with the secondary treatment equipment 2 through a pipeline, and the output end of the external workshop air cabinet waste gas source 3 is provided with an induced draft fan 31; the secondary treatment equipment 2 comprises a Venturi tube 21, a vacuum pump unit 22 and a secondary neutralization tank 23, wherein the secondary neutralization tank 23 is provided with a secondary treatment liquid output end 231, the input end of a vacuum pump set is communicated with the secondary treatment liquid output end 231 through a pipeline, the output end of the vacuum pump set is communicated with the input end 214 of the Venturi tube, the output end 215 of the Venturi tube is communicated with the input end 232 of the secondary neutralization tank, the Venturi tube 21 sequentially comprises a cylindrical part 211, a conical convergence part 212 and a cylindrical throat part 213 from the input end to the output end, a primary treatment gas input end 216 is further arranged on the side of the cylindrical part 211, a primary treatment gas output end 113 is communicated with the primary treatment gas input end 216 through a pipeline, and the primary treatment gas output end 113 is provided with a second valve 1131; the secondary neutralization tank 23 further comprises an exhaust gas output end 233 for communicating with an external exhaust gas treatment system, a liquid inlet 235 for adding a secondary treatment liquid, and an emptying pipe 234 for emptying the secondary treatment liquid, wherein the emptying pipe 234 is provided with a fourth valve 2341.
The secondary treatment apparatus 2 further comprises a gas tank 24 having an output 241 connected to the venturi input 214, an input 242 connected to the primary treatment gas output 113, and a second valve 1131 between the input 242 and the primary treatment gas output 113.
The primary neutralization tank 11 is also provided with a waste liquid discharge pipe 114 for discharging the primary treatment liquid to the outside.
The working principle is as follows: adding the secondary treatment liquid into a secondary neutralization tank 23, controlling the volume ratio of the secondary treatment liquid to the secondary neutralization tank 23 to be 3:4, and ensuring that the secondary neutralization tank cannot run without idle running of the secondary treatment liquid; the vacuum pump unit 22 is stopped, primary treatment liquid is added into the primary treatment liquid container 12, and the volume ratio of the primary treatment liquid to the secondary treatment liquid is controlled to be 1: 2; opening the first valve 121 and closing the third valve 1121; opening the second valve 1131, and starting the vacuum pump unit 22, the venturi tube 21 and the secondary treatment liquid form a circulation loop, the flow rate in the venturi tube 21 is reduced from coarse to fine, the flow rate is accelerated through the conical convergence part 212, the cylindrical part 211 forms a negative pressure, and the negative pressure sucks the primary treatment liquid into the neutralization tank body; the first valve 121 is closed, the third valve 1121 is opened, the waste gas input end 112 is located below the liquid level of the primary treatment liquid, waste gas of the external workshop air cabinet waste gas source 3 reaches the introducing neutralization tank through the waste gas input end 112 to perform neutralization reaction with the primary treatment liquid under the simultaneous action of negative pressure and the induced draft fan 31, and the primarily treated volatile gas enters the venturi tube 21 under the action of negative pressure to be fully mixed with the secondary treatment liquid flowing at high speed in the circulation loop.
Example 1:
step (1): dissolving sodium hydroxide in distilled water, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, then adding an acid mist settling agent, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, standing and cooling to room temperature, and controlling the volumes of the sodium hydroxide and the acid mist settling agent to be respectively 30% and 5% of the total volume ratio of the solution to obtain a primary treatment solution, wherein the acid mist settling agent is sodium carbonate;
step (2): dissolving urea peroxide and an acid mist absorbent in distilled water, then carrying out high-speed stirring treatment until the urea peroxide and the acid mist absorbent are completely dissolved, standing and cooling to room temperature, then adding an acid mist settling agent, carrying out high-speed stirring treatment until the urea peroxide, the acid mist absorbent and the acid mist settling agent are completely dissolved, standing and cooling to room temperature, controlling the volume ratios of the urea peroxide, the acid mist absorbent and the acid mist settling agent to be 6%, 15% and 5% respectively based on the total volume ratio of the solution to obtain a secondary treatment solution, adding the secondary treatment solution into a secondary neutralization tank, and controlling the volume ratios of the secondary treatment solution and the secondary neutralization tank to be 3:4, wherein the acid mist absorbent is sodium hydroxide, and the acid mist settling agent is sodium carbonate;
and (3): enabling the vacuum pump unit to be in a shutdown state, adding primary treatment liquid into a primary treatment liquid container, and controlling the volume ratio of the primary treatment liquid to the secondary treatment liquid to be 1: 2;
and (4): opening the first valve and closing the third valve; opening a second valve, starting a vacuum pump unit, wherein the flow in the Venturi tube is reduced from thick to thin, the flow speed is accelerated through a conical convergence part, a cylindrical part forms negative pressure, and primary treatment liquid is sucked into a neutralization tank body by the negative pressure;
and (5): and closing the first valve, opening the third valve, and leading the waste gas of the waste gas source of the external workshop air cabinet to the neutralization tank through the waste gas input end under the action of negative pressure.
Example 2:
step (1): dissolving sodium hydroxide in distilled water, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, adding an acid mist settling agent, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, standing and cooling to room temperature, and controlling the volumes of the sodium hydroxide and the acid mist settling agent to be respectively 30% and 5% of the total volume ratio of the solution to obtain a primary treatment solution, wherein the acid mist settling agent is potassium carbonate;
step (2): dissolving urea peroxide and an acid mist absorbent in distilled water, then carrying out high-speed stirring treatment until the urea peroxide and the acid mist absorbent are completely dissolved, standing and cooling to room temperature, then adding an acid mist settling agent, carrying out high-speed stirring treatment until the urea peroxide, the acid mist absorbent and the acid mist settling agent are completely dissolved, standing and cooling to room temperature, controlling the volume ratios of the urea peroxide, the acid mist absorbent and the acid mist settling agent to be 7%, 16% and 5% of the total volume ratio of the solution respectively to obtain a secondary treatment liquid, adding the secondary treatment liquid into a secondary neutralization box, and controlling the volume ratios of the secondary treatment liquid and the secondary neutralization box to be 3:4, wherein the acid mist absorbent is sodium carbonate, and the acid mist settling agent is potassium carbonate;
and (3): enabling the vacuum pump unit to be in a stop state, adding primary treatment liquid into a primary treatment liquid container, and controlling the volume ratio of the primary treatment liquid to the secondary treatment liquid to be 1: 2;
and (4): opening the first valve and closing the third valve; opening a second valve, starting a vacuum pump unit, wherein the flow in the Venturi tube is gradually reduced, the flow speed is accelerated through the conical convergence part, the cylindrical part forms negative pressure, and the primary treatment liquid is sucked into the neutralization tank body by the negative pressure;
and (5): and closing the first valve, opening the third valve, and leading the waste gas of the waste gas source of the external workshop air cabinet to the neutralization tank through the waste gas input end under the action of negative pressure.
Example 3:
step (1): dissolving sodium hydroxide in distilled water, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, adding an acid mist settling agent, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, standing and cooling to room temperature, and controlling the volumes of the sodium hydroxide and the acid mist settling agent to be respectively 30% and 5% of the total volume ratio of the solution to obtain a primary treatment solution, wherein the acid mist settling agent is cationic polyacrylamide;
step (2): dissolving urea peroxide and an acid mist absorbent in distilled water, then carrying out high-speed stirring treatment until the urea peroxide and the acid mist absorbent are completely dissolved, standing and cooling to room temperature, then adding an acid mist settling agent, carrying out high-speed stirring treatment until the urea peroxide, the acid mist absorbent and the acid mist settling agent are completely dissolved, standing and cooling to room temperature, controlling the volume ratios of the urea peroxide, the acid mist absorbent and the acid mist settling agent to be 7%, 15% and 5% respectively based on the total volume ratio of the solution to obtain a secondary treatment solution, adding the secondary treatment solution into a secondary neutralization box, and controlling the volume ratio of the secondary treatment solution to be 3:4, wherein the acid mist absorbent is efficient composite alkali, and the acid mist settling agent is cationic polyacrylamide;
and (3): enabling the vacuum pump unit to be in a shutdown state, adding primary treatment liquid into a primary treatment liquid container, and controlling the volume ratio of the primary treatment liquid to the secondary treatment liquid to be 1: 2;
and (4): opening the first valve and closing the third valve; opening a second valve, starting a vacuum pump unit, wherein the flow in the Venturi tube is gradually reduced, the flow speed is accelerated through the conical convergence part, the cylindrical part forms negative pressure, and the primary treatment liquid is sucked into the neutralization tank body by the negative pressure;
and (5): and closing the first valve, opening the third valve, and leading the waste gas of the waste gas source of the external workshop air cabinet to the neutralization tank through the waste gas input end under the action of negative pressure.
Example 4:
step (1): dissolving sodium hydroxide in distilled water, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, adding an acid mist settling agent, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, standing and cooling to room temperature, and controlling the volumes of the sodium hydroxide and the acid mist settling agent to be 30% and 5% respectively based on the total volume ratio of the solution to obtain primary treatment liquid, wherein the acid mist settling agent is diethanolamine;
step (2): dissolving urea peroxide and an acid mist absorbent in distilled water, then carrying out high-speed stirring treatment until the urea peroxide and the acid mist absorbent are completely dissolved, standing and cooling to room temperature, then adding an acid mist settling agent, carrying out high-speed stirring treatment until the urea peroxide, the acid mist absorbent and the acid mist settling agent are completely dissolved, standing and cooling to room temperature, controlling the volume ratios of the urea peroxide, the acid mist absorbent and the acid mist settling agent to be 6%, 15% and 5% respectively based on the total volume ratio of the solution to obtain a secondary treatment solution, adding the secondary treatment solution into a secondary neutralization tank, and controlling the volume ratios of the secondary treatment solution and the secondary neutralization tank to be 3:4, wherein the acid mist absorbent is potassium hydroxide, and the acid mist settling agent is diethanol amine;
and (3): enabling the vacuum pump unit to be in a stop state, adding primary treatment liquid into a primary treatment liquid container, and controlling the volume ratio of the primary treatment liquid to the secondary treatment liquid to be 1: 2;
and (4): opening the first valve and closing the third valve; opening a second valve, starting a vacuum pump unit, wherein the flow in the Venturi tube is reduced from thick to thin, the flow speed is accelerated through a conical convergence part, a cylindrical part forms negative pressure, and primary treatment liquid is sucked into a neutralization tank body by the negative pressure;
and (5): and closing the first valve, opening the third valve, and leading the waste gas of the waste gas source of the external workshop air cabinet to the neutralization tank through the waste gas input end under the action of negative pressure.
Example 5:
step (1): dissolving sodium hydroxide in distilled water, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, adding an acid mist settling agent, then carrying out high-speed stirring treatment until the acid mist settling agent is completely dissolved, standing and cooling to room temperature, and controlling the volume of the sodium hydroxide and the volume of the acid mist settling agent to respectively account for 30% and 5% of the total volume of the solution to obtain a primary treatment solution, wherein the acid mist settling agent is tetramethylammonium hydroxide;
step (2): dissolving urea peroxide and an acid mist absorbent in distilled water, then carrying out high-speed stirring treatment until the urea peroxide and the acid mist absorbent are completely dissolved, standing and cooling to room temperature, then adding an acid mist settling agent, carrying out high-speed stirring treatment until the urea peroxide, the acid mist absorbent and the acid mist settling agent are completely dissolved, standing and cooling to room temperature, controlling the volume ratios of the urea peroxide, the acid mist absorbent and the acid mist settling agent to be 7%, 16% and 5% respectively based on the total volume ratio of the solution to obtain a secondary treatment solution, adding the secondary treatment solution into a secondary neutralization box, and controlling the volume ratio of the secondary treatment solution to be 3:4, wherein the acid mist absorbent is calcium carbonate, and the acid mist settling agent is tetramethylammonium hydroxide;
and (3): enabling the vacuum pump unit to be in a stop state, adding primary treatment liquid into a primary treatment liquid container, and controlling the volume ratio of the primary treatment liquid to the secondary treatment liquid to be 1: 2;
and (4): opening the first valve and closing the third valve; opening a second valve, starting a vacuum pump unit, wherein the flow in the Venturi tube is gradually reduced, the flow speed is accelerated through the conical convergence part, the cylindrical part forms negative pressure, and the primary treatment liquid is sucked into the neutralization tank body by the negative pressure;
and (5): and closing the first valve, opening the third valve, and leading the waste gas of the waste gas source of the external workshop air cabinet to the neutralization tank through the waste gas input end under the action of negative pressure.
Example 6:
step (1): dissolving sodium hydroxide in distilled water, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, adding an acid mist settling agent, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, standing and cooling to room temperature, and controlling the volumes of the sodium hydroxide and the acid mist settling agent to be respectively 30% and 5% of the total volume ratio of the solution to obtain a primary treatment solution, wherein the acid mist settling agent is anionic polyacrylamide;
step (2): dissolving urea peroxide and an acid mist absorbent in distilled water, then carrying out high-speed stirring treatment until the urea peroxide and the acid mist absorbent are completely dissolved, standing and cooling to room temperature, then adding an acid mist settling agent, carrying out high-speed stirring treatment until the urea peroxide, the acid mist absorbent and the acid mist settling agent are completely dissolved, standing and cooling to room temperature, controlling the volume ratios of the urea peroxide, the acid mist absorbent and the acid mist settling agent to be 7%, 15% and 5% of the total volume ratio of the solution respectively to obtain a secondary treatment liquid, adding the secondary treatment liquid into a secondary neutralization box, and controlling the volume ratios of the secondary treatment liquid and the secondary neutralization box to be 3:4, wherein the acid mist absorbent is sodium chloride, and the acid mist settling agent is anionic polyacrylamide;
and (3): enabling the vacuum pump unit to be in a stop state, adding primary treatment liquid into a primary treatment liquid container, and controlling the volume ratio of the primary treatment liquid to the secondary treatment liquid to be 1: 2;
and (4): opening the first valve and closing the third valve; opening a second valve, starting a vacuum pump unit, wherein the flow in the Venturi tube is reduced from thick to thin, the flow speed is accelerated through a conical convergence part, a cylindrical part forms negative pressure, and primary treatment liquid is sucked into a neutralization tank body by the negative pressure;
and (5): and closing the first valve, opening the third valve, and leading the waste gas of the waste gas source of the external workshop air cabinet to the neutralization tank through the waste gas input end under the action of the negative pressure.
Example 7:
step (1): dissolving sodium hydroxide in distilled water, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, adding an acid mist settling agent, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, standing and cooling to room temperature, and controlling the volumes of the sodium hydroxide and the acid mist settling agent to be 30% and 5% respectively based on the total volume ratio of the solution to obtain a primary treatment solution, wherein the acid mist settling agent is a mixture of sodium carbonate and potassium carbonate;
step (2): dissolving urea peroxide and an acid mist absorbent in distilled water, then carrying out high-speed stirring treatment until the urea peroxide and the acid mist absorbent are completely dissolved, standing and cooling to room temperature, then adding an acid mist settling agent, carrying out high-speed stirring treatment until the urea peroxide, the acid mist absorbent and the acid mist settling agent are completely dissolved, standing and cooling to room temperature, controlling the volume ratios of the urea peroxide, the acid mist absorbent and the acid mist settling agent to be 6%, 15% and 5% of the total volume ratio of the solution respectively to obtain a secondary treatment solution, adding the secondary treatment solution into a secondary neutralization tank, and controlling the volume ratios of the secondary treatment solution and the secondary neutralization tank to be 3:4, wherein the acid mist absorbent is a mixture of sodium hydroxide and sodium carbonate, and the acid mist settling agent is a mixture of sodium carbonate and potassium carbonate;
and (3): enabling the vacuum pump unit to be in a shutdown state, adding primary treatment liquid into a primary treatment liquid container, and controlling the volume ratio of the primary treatment liquid to the secondary treatment liquid to be 1: 2;
and (4): opening the first valve and closing the third valve; opening a second valve, starting a vacuum pump unit, wherein the flow in the Venturi tube is reduced from thick to thin, the flow speed is accelerated through a conical convergence part, a cylindrical part forms negative pressure, and primary treatment liquid is sucked into a neutralization tank body by the negative pressure;
and (5): and closing the first valve, opening the third valve, and leading the waste gas of the waste gas source of the external workshop air cabinet to the neutralization tank through the waste gas input end under the action of negative pressure.
Example 8:
step (1): dissolving sodium hydroxide in distilled water, carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, adding an acid mist settling agent, carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, standing and cooling to room temperature, and controlling the volume of the sodium hydroxide and the volume of the acid mist settling agent to be respectively 30% and 5% of the total volume ratio of the solution to obtain primary treatment liquid, wherein the acid mist settling agent is a mixture of cationic polyacrylamide and diethanolamine;
step (2): dissolving urea peroxide and an acid mist absorbent in distilled water, then carrying out high-speed stirring treatment until the urea peroxide and the acid mist absorbent are completely dissolved, standing and cooling to room temperature, then adding an acid mist settling agent, carrying out high-speed stirring treatment until the urea peroxide, the acid mist absorbent and the acid mist settling agent are completely dissolved, standing and cooling to room temperature, controlling the volume ratio of the urea peroxide, the acid mist absorbent and the acid mist settling agent to be 7%, 16% and 5% of the total volume ratio of the solution respectively to obtain a secondary treatment solution, adding the secondary treatment solution into a secondary neutralization tank, and controlling the volume ratio of the secondary treatment solution to be 3:4, wherein the acid mist absorbent is a mixture of efficient composite alkali and potassium hydroxide, and the acid mist settling agent is a mixture of cationic polyacrylamide and diethanolamine;
and (3): enabling the vacuum pump unit to be in a stop state, adding primary treatment liquid into a primary treatment liquid container, and controlling the volume ratio of the primary treatment liquid to the secondary treatment liquid to be 1: 2;
and (4): opening the first valve and closing the third valve; opening a second valve, starting a vacuum pump unit, wherein the flow in the Venturi tube is reduced from thick to thin, the flow speed is accelerated through a conical convergence part, a cylindrical part forms negative pressure, and primary treatment liquid is sucked into a neutralization tank body by the negative pressure;
and (5): and closing the first valve, opening the third valve, and leading the waste gas of the waste gas source of the external workshop air cabinet to the neutralization tank through the waste gas input end under the action of the negative pressure.
Comparative example 1
Acid waste gas is neutralized and absorbed by spraying the waste gas treatment liquid which is single sodium hydroxide, and the waste gas of the waste gas source of the external workshop air cabinet is finally output to an external waste gas treatment system through a spraying absorption device from bottom to top in a single file.
Comparative example 2
And introducing waste gas of an external workshop air cabinet waste gas source into the combustion chamber, directly contacting with flame for combustion, and finally outputting to an external waste gas treatment system.
The pH values of the gases treated in examples 1-8 from the input side of the external exhaust gas treatment system as in comparative examples 1-2 were measured for the same treatment time as1hThe results are shown in table 1 below:
table 1 reference standard tests on treated gases from the input of external exhaust treatment systems in examples 1-8 and comparative examples 1-2
As can be seen from Table 1, by comparing comparative examples 1-2 with examples 1-8, the exhaust gas treated by examples 1-8 of the present invention has lower hydrogen chloride concentration, lower sulfuric acid mist concentration and higher nitrogen oxide concentration than the emission standard and the emission values of comparative examples 1-2, and the comprehensive performance is superior to the acid gas treatment process commonly found in the market.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. An exhaust gas treatment method, characterized by comprising the steps of:
step (1): dissolving sodium hydroxide in distilled water, then carrying out high-speed stirring treatment until the sodium hydroxide is completely dissolved, then adding an acid mist settling agent, then carrying out high-speed stirring treatment until the acid mist settling agent is completely dissolved, standing and cooling to room temperature, and controlling the volumes of the sodium hydroxide and the acid mist settling agent to be respectively 30% and 5% of the total volume of the solution to obtain a primary treatment solution;
step (2): adding a secondary treatment fluid into a secondary neutralization tank, wherein the secondary treatment fluid is prepared by the following steps: dissolving urea peroxide and an acid mist absorbent in distilled water, then carrying out high-speed stirring treatment until the urea peroxide and the acid mist absorbent are completely dissolved, standing and cooling to room temperature, then adding an acid mist settling agent, carrying out high-speed stirring treatment until the acid mist settling agent is completely dissolved, standing and cooling to room temperature, and controlling the volumes of the urea peroxide, the acid mist absorbent and the acid mist settling agent to be 6-7%, 15-16% and 5% respectively based on the total volume ratio of the solution; the acid mist absorbent is composed of any one or more than one of sodium hydroxide efficient composite alkali, potassium hydroxide, calcium carbonate and sodium chloride; the acid mist sedimentation agent is composed of one or more than one of cationic polyacrylamide, diethanol amine, tetramethyl ammonium hydroxide or anionic polyacrylamide;
and (3): enabling the vacuum pump unit to be in a shutdown state, adding primary treatment liquid into a primary treatment liquid container, and controlling the volume ratio of the primary treatment liquid to the secondary treatment liquid to be 1: 2;
and (4): opening the first valve and closing the third valve; opening a second valve, starting a vacuum pump unit, wherein the flow in the Venturi tube is reduced from thick to thin, the flow speed is accelerated through a conical convergence part, a cylindrical part forms negative pressure, and primary treatment liquid is sucked into a neutralization tank body by the negative pressure;
and (5): the first valve is closed, the third valve is opened, and the waste gas of the waste gas source of the external workshop air cabinet reaches the neutralization tank through the waste gas input end under the action of negative pressure;
the method adopts a Venturi effect-based waste gas treatment system, the waste gas treatment system comprises primary treatment equipment and secondary treatment equipment, the primary treatment equipment comprises a primary neutralization tank and a primary treatment liquid container, the primary neutralization tank is provided with a primary treatment liquid input end, a waste gas input end and a primary treatment gas output end, the output end of the primary treatment liquid container is communicated with the primary treatment liquid input end through a pipeline, the output end of the primary treatment liquid container is provided with a first valve, the waste gas input end is lower than the primary treatment gas output end, the waste gas input end is communicated with the output end of an external workshop air cabinet waste gas source through a pipeline, the waste gas input end is provided with a third valve, and the output end of the external workshop air cabinet waste gas source is provided with an induced draft fan; the secondary treatment equipment comprises a Venturi tube, a vacuum pump set and a secondary neutralization box, wherein the secondary neutralization box is provided with a secondary treatment liquid output end, the input end of the vacuum pump set is communicated with the secondary treatment liquid output end through a pipeline, the output end of the vacuum pump set is communicated with the input end of the Venturi tube, the output end of the Venturi tube is communicated with the input end of the secondary neutralization box, the Venturi tube sequentially comprises a cylindrical part, a conical convergence part and a cylindrical throat part from the input end to the output end, a primary treatment gas input end is further arranged on the side of the cylindrical part, the primary treatment gas output end is communicated with the primary treatment gas input end through a pipeline, and the primary treatment gas output end is provided with a second valve; the secondary treatment equipment still includes the gas pitcher, the output of gas pitcher communicate in venturi's input, the input of gas pitcher communicate in the primary treatment gas output end, the second valve be located the input of gas pitcher with between the primary treatment gas output end.
2. The exhaust gas treatment method according to claim 1, characterized in that: the primary neutralization tank is also provided with a waste liquid discharge pipe for outputting the primary treatment liquid to the outside.
3. The exhaust gas treatment method according to claim 1, wherein the volume ratio of the primary treatment liquid to the secondary treatment liquid is controlled to be 1: 2.
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