CN113019070A - Resource treatment method for sulfonated waste gas and nitrated waste gas generated in dye production - Google Patents
Resource treatment method for sulfonated waste gas and nitrated waste gas generated in dye production Download PDFInfo
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Abstract
The invention discloses a resource treatment method of sulfonated waste gas and nitrated waste gas generated in dye production, which comprises the steps of feeding mixed gas into an inner cavity of a filler reaction tower from bottom to top through an air inlet of the filler reaction tower, enabling absorption liquid in a storage kettle to sequentially pass through a liquid outlet, a delivery pump, a liquid inlet of the filler reaction tower and at least one atomizing nozzle to form jet liquid, and feeding the jet liquid into the inner cavity of the filler reaction tower from top to bottom, SO that the absorption liquid is in contact with the mixed gas and then faces SO in the mixed gas2And NO2Recycling, refluxing to the storage kettle through the liquid outlet of the packed reaction tower, sending into the inner cavity of the packed reaction tower again through the delivery pump, and discharging the gas outlet of the packed reaction towerThe tail gas is sent into a tail gas detection and treatment component, and is discharged into the atmosphere after being treated by the tail gas detection and treatment component. The invention can simultaneously absorb high-concentration SO2And NO2The waste gas effectively relieves the atmospheric environment problem generated in the dye production process, so that the production process in the dye industry is cleaner and cheaper, and the product nitrosyl sulfuric acid with high added value is produced.
Description
Technical Field
The invention belongs to the technical field of industrial waste gas treatment, and particularly relates to a resource treatment method of sulfonated waste gas and nitrated waste gas generated in dye production.
Background
A large amount of NO is discharged in the nitration process of dye production2Gas, sulfonation processes may emit large amounts of SO2The current treatment method for two gases mainly adopts liquid caustic soda absorption and NO2After absorption, mixed salt wastewater of sodium nitrate and sodium nitrite is generated; SO (SO)2Sodium sulfite mixed salt wastewater is generated after absorption by alkali liquor. The recovered sodium sulfite can be used for producing lignin, and sodium nitrate salt and sodium nitrite salt wastewater does not have a good treatment mode at present.
CN105536478A discloses a resourceful treatment method and a resourceful treatment system for production tail gas, waste gas generated in a nitration process is absorbed by sulfuric acid solution, and the obtained absorption liquid is used for absorbing acid-out waste gas to obtain a nitrosyl sulfuric acid product and excessive NO2Or SO2Finally recovering sodium nitrite or sodium sulfite through alkali absorption. The method only aims at the absorption research of the denitration tail gas and the sulfur-containing tail gas. But the method usesThe absorption process is complex and long, and the economic value is not high. Therefore, it is necessary to develop and design a set of device to process SO simultaneously2With NO2Tail gas, realizes the resource of sulfur and nitre with economy and high efficiency, reduces the production cost of the diazotization reaction of the disperse dye and simplifies the operation flow.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a resource treatment method of sulfonated waste gas and nitrated waste gas generated in dye production.
The technical scheme of the invention is as follows:
a method for recycling sulfonated waste gas and nitrated waste gas generated in dye production adopts a reaction device which comprises a filler reaction tower, a storage kettle, a delivery pump and a tail gas detection and treatment component;
the upper end of the packing reaction tower is provided with a liquid inlet and a gas outlet, the lower end of the packing reaction tower is provided with a liquid outlet, the side wall of the lower part of the packing reaction tower is provided with a gas inlet, the upper end of the inner cavity of the packing reaction tower is provided with at least one atomizing nozzle, the liquid inlet is communicated with the at least one atomizing nozzle,
a storage kettle, wherein the upper end of the storage kettle is provided with a liquid inlet, the lower end of the storage kettle is provided with a liquid outlet, absorption liquid is filled in the storage kettle, the absorption liquid consists of concentrated sulfuric acid with the concentration of at least 80 percent and concentrated nitric acid with the concentration of at least 50 percent, the volume percentage of the concentrated nitric acid in the absorption liquid is 0-30 percent,
the storage kettle is arranged below the packing reaction tower, a liquid inlet of the storage kettle is communicated with a liquid outlet of the packing reaction tower, the liquid outlet of the storage kettle is communicated with a liquid inlet of the packing reaction tower through a conveying pump, and a gas outlet of the packing reaction tower is communicated with the tail gas detection and treatment assembly;
the resource treatment method comprises the following steps:
(1) respectively cooling the sulfonated waste gas and the nitrated waste gas to below 70 ℃, then uniformly mixing, and supplementing N into the mixture2Or air, forming a mixed gas;
(2) the mixed gas is sent into the inner cavity of the filler reaction tower from bottom to top through the air inlet of the filler reaction tower, and the absorption liquid in the storage kettle sequentially passes through the liquid outlet, the delivery pump and the fillerThe liquid inlet of the reaction tower and at least one atomizing nozzle form a spray liquid which is sent into the inner cavity of the packing reaction tower from top to bottom, SO that the absorption liquid is contacted with the mixed gas and then faces SO in the mixed gas2And NO2And recycling, refluxing to a storage kettle through a liquid outlet of the packing reaction tower, sending to an inner cavity of the packing reaction tower again through a conveying pump, circulating until the mass content of the nitrosyl sulfuric acid in the absorption liquid is more than or equal to 40%, sending tail gas discharged from a gas outlet of the packing reaction tower to a tail gas detection and treatment assembly, and discharging to the atmosphere after being treated by the tail gas detection and treatment assembly.
In a preferred embodiment of the present invention, NO in the mixed gas2Has a volume concentration of 800-3000ppm, SO2In a volume concentration of NO20.1-3 times the volume concentration of (A).
Further preferably, NO in the mixed gas2Has a volume concentration of 800-3000ppm, SO2The volume concentration of (D) is 400-6000 ppm.
In a preferred embodiment of the present invention, the absorption solution consists of concentrated sulfuric acid with a concentration of 80% and concentrated nitric acid with a concentration of 50%, and the volume percentage of the concentrated nitric acid in the absorption solution is 0-30%.
In a preferred embodiment of the present invention, in the step (1), the temperature of the sulfonation waste gas and the temperature of the nitration waste gas are respectively reduced to below 70 ℃ by a condenser.
Further preferably, the outlet of the condenser is provided with a gas-liquid separator device to block the water vapor formed by condensation from entering the packing reaction tower.
In a preferred embodiment of the present invention, the storage tank is further provided with a feed/discharge port.
In a preferred embodiment of the present invention, the sidewall of the storage tank is further provided with a window for determining the height of the material in the storage tank and the color of the product.
In a preferred embodiment of the present invention, the exhaust gas detection and treatment assembly has a lye therein to absorb the remaining contaminants and product color in the exhaust gas.
Further preferably, the alkali liquor is a sodium hydroxide solution with a volume concentration of 15%.
The invention has the beneficial effects that:
1. the invention discharges high-concentration SO generated by nitration and sulfonation in the production process of H acid in the dye industry2And NO2The method has the advantages that resource utilization is carried out, the absorption liquid formed by concentrated acid is used for absorbing high-concentration waste gas to obtain the nitrosyl sulfuric acid product, waste is changed into valuable, the economical efficiency of waste gas treatment in dye production is improved, and the utilization value of the waste gas is improved.
2. The invention can simultaneously absorb high-concentration SO2And NO2The waste gas effectively relieves the atmospheric environment problem generated in the dye production process, so that the production process in the dye industry is cleaner and cheaper, the waste is changed into valuable, and the economic benefit is improved while the environmental protection is realized.
Drawings
FIG. 1 is a schematic structural view of a reaction apparatus in an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further illustrated and described below with reference to the accompanying drawings by means of specific embodiments.
As shown in FIG. 1, the reaction apparatus in the following embodiments includes a packed reaction tower 1, a storage tank 2, a transfer pump 3 and an off-gas detecting and treating component 4;
the upper end of the packing reaction tower 1 is provided with a liquid inlet and a gas outlet, the lower end is provided with a liquid outlet, the side wall of the lower part is provided with a gas inlet, the upper end of the inner cavity is provided with at least one atomizing nozzle (not shown in the figure), the liquid inlet is communicated with at least one atomizing nozzle,
a storage kettle 2, the upper end of which is provided with a liquid inlet, the lower end of which is provided with a liquid outlet and a material inlet and outlet, the side wall of which is provided with a window (not shown in the figure) for judging the height and the product color of the materials in the storage kettle 2, and the storage kettle is filled with absorption liquid which is composed of concentrated sulfuric acid with the concentration of 80 percent and concentrated nitric acid with the concentration of 50 percent, and the volume percentage of the concentrated nitric acid in the absorption liquid is 0 to 30 percent,
store cauldron 2 and locate the below of packing reaction tower 1, store the liquid outlet of cauldron 2's inlet intercommunication packing reaction tower 1, store the liquid outlet of cauldron 2 and pass through the inlet of delivery pump 3 intercommunication packing reaction tower 1, the gas outlet intercommunication tail gas detection and treatment subassembly 4 of packing reaction tower 1 has the sodium hydroxide solution that volume concentration is 15% in the tail gas detection and treatment subassembly 4.
The outlet of the condenser in the following embodiments is provided with a gas-liquid separator device to block the water vapor formed by condensation from entering the packed reaction column 1.
The absorption liquid in the following examples absorbs SO2And NO2The reaction formula (c) is as follows:
SO2+HNO3→SO3+HNO2→NOHSO4
2NO2+H2SO4→NOHSO4+HNO3
NO+NO2+2H2SO4→2NOHSO4+H2O
NO+H2SO4→H2SO4NO
2NO2+SO2+H2SO4→2NOHSO4
example 1
(1) Respectively cooling sulfonated waste gas and nitrated waste gas generated in the production process of H acid of dye with the temperature of about 75 ℃ to below 70 ℃ through a condenser, uniformly mixing through a gas mixer, and properly supplementing N into the mixture2Or air to optimize the absorption effect, to form a gas mixture, the NO in the gas mixture2In a volume concentration of 1500ppm, SO24500ppm by volume;
(2) sending the mixed gas into the inner cavity of the filler reaction tower 1 from bottom to top through the air inlet of the filler reaction tower 1, enabling the absorption liquid (the volume percentage of the concentrated nitric acid in the absorption liquid is 25%) in the storage kettle 2 to sequentially pass through the liquid outlet, the delivery pump 3, the liquid inlet of the filler reaction tower 1 and at least one atomizing nozzle to form a spraying liquid, and sending the spraying liquid into the inner cavity of the filler reaction tower 1 from top to bottom, SO that the absorption liquid is in contact with the mixed gas and then faces SO in the mixed gas2And NO2Is recycled and then goes out of the packed reaction tower 1The mixture flows back to the storage kettle 2, and is sent into the inner cavity of the filler reaction tower 1 again through the delivery pump 3, and the process is circulated until the mass content of the nitrosyl sulfuric acid in the absorption liquid reaches 40 percent, the mass content of the nitric acid is 3 percent, and the color is dark yellow, namely the nitrosyl sulfuric acid product;
(3) conveying tail gas discharged from a gas outlet of the filler reaction tower 1 into a tail gas detection and treatment component 4, absorbing residual pollutants by a sodium hydroxide solution (25 ℃) with the volume concentration of 15% in the tail gas detection and treatment component 4, and then discharging the residual pollutants into the atmosphere at high altitude; the SO in the exhaust gas is detected2And NO2All reach the standard.
Example 2
(1) Respectively cooling sulfonated waste gas and nitrated waste gas generated in the production process of H acid of dye with the temperature of about 78 ℃ to below 70 ℃ through a condenser, uniformly mixing through a gas mixer, and properly supplementing N into the mixture2Or air to optimize the absorption effect, to form a gas mixture, the NO in the gas mixture2In a volume concentration of 2000ppm, SO2700ppm by volume;
(2) sending the mixed gas into the inner cavity of the filler reaction tower 1 from bottom to top through the air inlet of the filler reaction tower 1, enabling the absorption liquid (the volume percentage of concentrated nitric acid in the absorption liquid is 5%) in the storage kettle 2 to sequentially pass through the liquid outlet, the delivery pump 3, the liquid inlet of the filler reaction tower 1 and at least one atomizing nozzle to form spraying liquid, and sending the spraying liquid into the inner cavity of the filler reaction tower 1 from top to bottom, SO that the absorption liquid is in contact with the mixed gas and then faces SO in the mixed gas2And NO2Recycling, refluxing to a storage kettle 2 through a liquid outlet of the filler reaction tower 1, and sending to an inner cavity of the filler reaction tower 1 again through a conveying pump 3, and circulating in such a way until the mass content of nitrosyl sulfuric acid in the absorption liquid reaches 40%, the mass content of nitric acid is 0.1%, and the color is dark yellow, namely a nitrosyl sulfuric acid product;
(3) conveying tail gas discharged from a gas outlet of the filler reaction tower 1 into a tail gas detection and treatment component 4, absorbing residual pollutants by a sodium hydroxide solution (25 ℃) with the volume concentration of 15% in the tail gas detection and treatment component 4, and then discharging the residual pollutants into the atmosphere at high altitude; detected and dischargedSO in gas2And NO2All reach the standard.
Example 3
(1) The sulfonated waste gas and the nitrated waste gas generated in the process of producing the H acid of the dye with the temperature of about 65 ℃ are mixed uniformly by a gas mixer, and N is supplemented properly2Or air to optimize the absorption effect, to form a gas mixture, the NO in the gas mixture2In a volume concentration of 1000ppm, SO2The volume concentration of (B) is 100 ppm;
(2) sending the mixed gas into the inner cavity of the filler reaction tower 1 from bottom to top through the air inlet of the filler reaction tower 1, enabling the absorption liquid (the volume percentage of the concentrated nitric acid in the absorption liquid is 20%) in the storage kettle 2 to sequentially pass through the liquid outlet, the delivery pump 3, the liquid inlet of the filler reaction tower 1 and at least one atomizing nozzle to form a spraying liquid, and sending the spraying liquid into the inner cavity of the filler reaction tower 1 from top to bottom, SO that the absorption liquid is in contact with the mixed gas and then faces SO in the mixed gas2And NO2Recycling, refluxing to a storage kettle 2 through a liquid outlet of the filler reaction tower 1, and sending to an inner cavity of the filler reaction tower 1 again through a conveying pump 3, and circulating in such a way until the mass content of nitrosyl sulfuric acid in the absorption liquid reaches 40%, the mass content of nitric acid is 1%, and the color is dark yellow, namely a nitrosyl sulfuric acid product;
(3) conveying tail gas discharged from a gas outlet of the filler reaction tower 1 into a tail gas detection and treatment component 4, absorbing residual pollutants by a sodium hydroxide solution (25 ℃) with the volume concentration of 15% in the tail gas detection and treatment component 4, and then discharging the residual pollutants into the atmosphere at high altitude; the SO in the exhaust gas is detected2And NO2All reach the standard.
Example 4
(1) Respectively cooling sulfonated waste gas and nitrated waste gas generated in the production process of H acid of dye with the temperature of about 80 ℃ to below 70 ℃ through a condenser, then uniformly mixing through a gas mixer, and properly supplementing N into the mixture2Or air to optimize the absorption effect, to form a gas mixture, the NO in the gas mixture2In a volume concentration of 3000ppm, SO2Has a volume concentration of 400 ppm;
(2) introducing the mixed gasThe absorption liquid (the volume percentage of the concentrated nitric acid in the absorption liquid is 0%) in the storage kettle 2 sequentially passes through a liquid outlet, a delivery pump 3, a liquid inlet of the packing reaction tower 1 and at least one atomizing nozzle to form spraying liquid, and the spraying liquid is fed into the inner cavity of the packing reaction tower 1 from top to bottom, SO that the absorption liquid is contacted with the mixed gas and then faces SO in the mixed gas2And NO2Recycling, refluxing to a storage kettle 2 through a liquid outlet of the filler reaction tower 1, and sending to an inner cavity of the filler reaction tower 1 again through a conveying pump 3, and circulating in such a way until the mass content of the nitrosyl sulfuric acid in the absorption liquid reaches 40% and the color is dark yellow, namely the nitrosyl sulfuric acid product;
(3) conveying tail gas discharged from a gas outlet of the filler reaction tower 1 into a tail gas detection and treatment component 4, absorbing residual pollutants by a sodium hydroxide solution (25 ℃) with the volume concentration of 15% in the tail gas detection and treatment component 4, and then discharging the residual pollutants into the atmosphere at high altitude; the SO in the exhaust gas is detected2And NO2All reach the standard.
Example 5
(1) The sulfonated waste gas and the nitrated waste gas generated in the process of producing the H acid of the dye with the temperature of about 65 ℃ are mixed uniformly by a gas mixer, and N is supplemented properly2Or air to optimize the absorption effect, to form a gas mixture, the NO in the gas mixture2Has a volume concentration of 1200ppm, SO2The volume concentration of (D) is 2500 ppm;
(2) sending the mixed gas into the inner cavity of the filler reaction tower 1 from bottom to top through the air inlet of the filler reaction tower 1, enabling the absorption liquid (30% of concentrated nitric acid in the absorption liquid) in the storage kettle 2 to sequentially pass through the liquid outlet, the delivery pump 3, the liquid inlet of the filler reaction tower 1 and at least one atomizing nozzle to form a spraying liquid, and sending the spraying liquid into the inner cavity of the filler reaction tower 1 from top to bottom, SO that the absorption liquid is in contact with the mixed gas and then faces SO in the mixed gas2And NO2Recycling, refluxing to a storage kettle 2 through a liquid outlet of the filler reaction tower 1, sending to an inner cavity of the filler reaction tower 1 again through a delivery pump 3, and circulating until the mass content of nitrosyl sulfuric acid in the absorption liquid reaches 40 percent, 3 percent of nitric acid by mass and deep yellow color, namely a nitrosyl sulfuric acid product;
(3) conveying tail gas discharged from a gas outlet of the filler reaction tower 1 into a tail gas detection and treatment component 4, absorbing residual pollutants by a sodium hydroxide solution (25 ℃) with the volume concentration of 15% in the tail gas detection and treatment component 4, and then discharging the residual pollutants into the atmosphere at high altitude; the SO in the exhaust gas is detected2And NO2All reach the standard.
Example 6
(1) The sulfonated waste gas and the nitrated waste gas generated in the process of producing the H acid of the dye with the temperature of about 60 ℃ are evenly mixed by a gas mixer, N2 or air is appropriately supplemented to optimize the absorption effect, and mixed gas is formed, wherein the NO in the mixed gas2Has a volume concentration of 1200ppm, SO2The volume concentration of (D) is 2500 ppm;
(2) sending the mixed gas into the inner cavity of the filler reaction tower 1 from bottom to top through the air inlet of the filler reaction tower 1, enabling the absorption liquid (the volume percentage of the concentrated nitric acid in the absorption liquid is 15%) in the storage kettle 2 to sequentially pass through the liquid outlet, the delivery pump 3, the liquid inlet of the filler reaction tower 1 and at least one atomizing nozzle to form a spraying liquid, and sending the spraying liquid into the inner cavity of the filler reaction tower 1 from top to bottom, SO that the absorption liquid is in contact with the mixed gas and then faces SO in the mixed gas2And NO2Recycling, refluxing to a storage kettle 2 through a liquid outlet of the filler reaction tower 1, and sending to an inner cavity of the filler reaction tower 1 again through a conveying pump 3, and circulating in such a way until the mass content of nitrosyl sulfuric acid in the absorption liquid reaches 40%, the mass content of nitric acid reaches 1.2%, and the color is dark yellow, namely a nitrosyl sulfuric acid product;
(3) conveying tail gas discharged from a gas outlet of the filler reaction tower 1 into a tail gas detection and treatment component 4, absorbing residual pollutants by a sodium hydroxide solution (25 ℃) with the volume concentration of 15% in the tail gas detection and treatment component 4, and then discharging the residual pollutants into the atmosphere at high altitude; the SO in the exhaust gas is detected2And NO2All reach the standard.
Example 7
(1) Waste sulfonation generated in the process of producing H acid of dye with the temperature of about 80 DEG CThe temperature of the gas and the nitration waste gas is respectively reduced to below 70 ℃ by a condenser, then the gas and the nitration waste gas are uniformly mixed by a gas mixer, and N is properly supplemented into the gas and the nitration waste gas2Or air to optimize the absorption effect, to form a gas mixture, the NO in the gas mixture2Has a volume concentration of 1900ppm, SO2The volume concentration of (A) is 4000 ppm;
(2) sending the mixed gas into the inner cavity of the filler reaction tower 1 from bottom to top through the air inlet of the filler reaction tower 1, enabling the absorption liquid (the volume percentage of the concentrated nitric acid in the absorption liquid is 25%) in the storage kettle 2 to sequentially pass through the liquid outlet, the delivery pump 3, the liquid inlet of the filler reaction tower 1 and at least one atomizing nozzle to form a spraying liquid, and sending the spraying liquid into the inner cavity of the filler reaction tower 1 from top to bottom, SO that the absorption liquid is in contact with the mixed gas and then faces SO in the mixed gas2And NO2Recycling, refluxing to a storage kettle 2 through a liquid outlet of the filler reaction tower 1, and sending to an inner cavity of the filler reaction tower 1 again through a conveying pump 3, and circulating in such a way until the mass content of nitrosyl sulfuric acid in the absorption liquid reaches 40 percent, the mass content of nitric acid is 0.8 percent, and the color is dark yellow, namely a nitrosyl sulfuric acid product;
(3) conveying tail gas discharged from a gas outlet of the filler reaction tower 1 into a tail gas detection and treatment component 4, absorbing residual pollutants by a sodium hydroxide solution (25 ℃) with the volume concentration of 15% in the tail gas detection and treatment component 4, and then discharging the residual pollutants into the atmosphere at high altitude; the SO in the exhaust gas is detected2And NO2All reach the standard.
Example 8
(1) Respectively cooling sulfonated waste gas and nitrated waste gas generated in the production process of H acid of dye with the temperature of about 70 ℃ to below 70 ℃ through a condenser, then uniformly mixing through a gas mixer, and properly supplementing N into the mixture2Or air to optimize the absorption effect, to form a gas mixture, the NO in the gas mixture2In a volume concentration of 1500ppm, SO2The volume concentration of (A) is 1000 ppm;
(2) the mixed gas is sent into the inner cavity of the packed reaction tower 1 from bottom to top through the air inlet of the packed reaction tower 1, and the absorption liquid (concentrated nitric acid with volume percentage in the absorption liquid) in the storage kettle 2 is15%) through a liquid outlet, a delivery pump 3, a liquid inlet of the packing reaction tower 1 and at least one atomizing nozzle in sequence to form a spray liquid which is sent into an inner cavity of the packing reaction tower 1 from top to bottom SO that the absorption liquid contacts with the mixed gas and then faces SO in the mixed gas2And NO2Recycling, refluxing to a storage kettle 2 through a liquid outlet of the filler reaction tower 1, and sending to an inner cavity of the filler reaction tower 1 again through a conveying pump 3, and circulating in such a way until the mass content of nitrosyl sulfuric acid in the absorption liquid reaches 40 percent, the mass content of nitric acid is 0.6 percent, and the color is dark yellow, namely a nitrosyl sulfuric acid product;
(3) conveying tail gas discharged from a gas outlet of the filler reaction tower 1 into a tail gas detection and treatment component 4, absorbing residual pollutants by a sodium hydroxide solution (25 ℃) with the volume concentration of 15% in the tail gas detection and treatment component 4, and then discharging the residual pollutants into the atmosphere at high altitude; the SO in the exhaust gas is detected2And NO2All reach the standard.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. A resource treatment method of sulfonated waste gas and nitrated waste gas generated in dye production is characterized in that: adopting a reaction device comprising a filler reaction tower, a storage kettle, a delivery pump and a tail gas detection and treatment component;
the upper end of the packing reaction tower is provided with a liquid inlet and a gas outlet, the lower end of the packing reaction tower is provided with a liquid outlet, the side wall of the lower part of the packing reaction tower is provided with a gas inlet, the upper end of the inner cavity of the packing reaction tower is provided with at least one atomizing nozzle, the liquid inlet is communicated with the at least one atomizing nozzle,
a storage kettle, wherein the upper end of the storage kettle is provided with a liquid inlet, the lower end of the storage kettle is provided with a liquid outlet, absorption liquid is filled in the storage kettle, the absorption liquid consists of concentrated sulfuric acid with the concentration of at least 80 percent and concentrated nitric acid with the concentration of at least 50 percent, the volume percentage of the concentrated nitric acid in the absorption liquid is 0-30 percent,
the storage kettle is arranged below the packing reaction tower, a liquid inlet of the storage kettle is communicated with a liquid outlet of the packing reaction tower, the liquid outlet of the storage kettle is communicated with a liquid inlet of the packing reaction tower through a conveying pump, and a gas outlet of the packing reaction tower is communicated with the tail gas detection and treatment assembly; the resource treatment method comprises the following steps:
(1) respectively cooling the sulfonated waste gas and the nitrated waste gas to below 70 ℃, then uniformly mixing, and supplementing N into the mixture2Or air, forming a mixed gas;
(2) sending the mixed gas into the inner cavity of the packing reaction tower from bottom to top through the air inlet of the packing reaction tower, enabling the absorption liquid in the storage kettle to sequentially pass through the liquid outlet of the storage kettle, the delivery pump, the liquid inlet of the packing reaction tower and at least one atomizing nozzle to form spraying liquid, and sending the spraying liquid into the inner cavity of the packing reaction tower from top to bottom to enable the absorption liquid to contact with the mixed gas and then react with SO in the mixed gas2And NO2And recycling, refluxing to a storage kettle through a liquid outlet of the packing reaction tower, sending to an inner cavity of the packing reaction tower again through a conveying pump, circulating until the mass content of the nitrosyl sulfuric acid in the absorption liquid is more than or equal to 40%, sending tail gas discharged from a gas outlet of the packing reaction tower to a tail gas detection and treatment assembly, and discharging to the atmosphere after being treated by the tail gas detection and treatment assembly.
2. The recycling method according to claim 1, wherein: NO in the mixed gas2Has a volume concentration of 800-3000ppm, SO2In a volume concentration of NO20.1-3 times the volume concentration of (A).
3. The recycling method according to claim 2, wherein: NO in the mixed gas2Has a volume concentration of 800-3000ppm, SO2The volume concentration of (D) is 400-6000 ppm.
4. The recycling method according to claim 1, wherein: the absorption liquid consists of concentrated sulfuric acid with the concentration of 80% and concentrated nitric acid with the concentration of 50%, and the volume percentage of the concentrated nitric acid in the absorption liquid is 0-30%.
5. The recycling method according to claim 1, wherein: in the step (1), the temperature of the sulfonated waste gas and the nitrated waste gas is respectively reduced to below 70 ℃ by a condenser.
6. The recycling method according to claim 5, wherein: and a gas-liquid separator device is arranged at an outlet of the condenser to prevent water vapor formed by condensation from entering the packing reaction tower.
7. The recycling method according to claim 1, wherein: the storage kettle is also provided with a material inlet and a material outlet.
8. The recycling method according to claim 1, wherein: the side wall of the storage kettle is also provided with a window to judge the height of the material in the storage kettle and the color of the product.
9. The recycling method according to claim 1, wherein: the tail gas detection and treatment assembly is provided with alkali liquor to absorb residual pollutants in the tail gas.
10. The recycling method according to claim 9, wherein: the alkali liquor is sodium hydroxide solution with the volume concentration of 15%.
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| CN114452788A (en) * | 2022-03-17 | 2022-05-10 | 江苏桂铭机械有限公司 | Sweetener with tail end detects |
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