CN105327608A - Device and method for recovering gas of nitrogen oxides in production process of nitro-cotton - Google Patents
Device and method for recovering gas of nitrogen oxides in production process of nitro-cotton Download PDFInfo
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- CN105327608A CN105327608A CN201510817380.2A CN201510817380A CN105327608A CN 105327608 A CN105327608 A CN 105327608A CN 201510817380 A CN201510817380 A CN 201510817380A CN 105327608 A CN105327608 A CN 105327608A
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Abstract
The invention relates to the field of treatment of waste gas generated in the production of nitro-cotton, aims to provide a device and a method for recovering gas of nitrogen oxides in the production process of nitro-cotton. The device comprises a first absorption unit, a second absorption unit, a third absorption unit, an exhaust fan, a first hydrometer and a second hydrometer, wherein the first absorption unit comprises a water washing absorption tower; the second absorption unit comprises at least two water washing absorption towers connected in series, is arranged at a station behind the first absorption unit and is connected with the first absorption unit in series; the third absorption unit comprises at least one absorption tower with a urea and hydrogen peroxide mixed solution as an absorbent, is arranged at a station behind the second absorption unit and is connected with the second absorption unit in series; an outlet for 60% nitric acid is formed behind the first hydrometer, and an outlet for 30% nitric acid is formed behind the second hydrometer; multi-stage water washing treatment and urea and hydrogen peroxide treatment are adopted, secondary pollution cannot be caused in the whole treatment process, nitric acid with two kinds of concentration can be provided simultaneously, users of nitric acid are increased, normal operation of a recovery system for the gas of nitrogen oxides is guaranteed, and the economic efficiency of recovery of the gas of nitrogen oxides is improved.
Description
Technical field
The present invention relates to nitrocotton process gas process field, particularly relate to the processing method of the smoke of gunpowder in a kind of nitrocotton production process.
Background technology
Cellulose nitrate, is commonly called as nitrocotton or nitrocellulose, and be the product of cellulose and nitric acid reaction, molecular formula is C
6h
7o
2(ONO
2)
a(OH)
3-an, wherein a is esterification degree, and n is the degree of polymerization.Nitrocotton, at first for military domain, is the important source material manufacturing propellant powder, guided missile, propellant; Along with the development of science and technology, the range of application of nitrocotton is no longer confined in military use product, and is embodied in the every aspect of daily life, as Automobile paint, solid alcohol and electronic product bonding agent etc.
The preparation process of current nitrocotton is mainly as follows: purified cotton and nitration mixture generation nitration reaction generate acid nitrocotton, acid is driven through centrifugal carrying out, with dust technology and water, it is washed again, then the instability of product is processed, cut afterwards, undertaken mixed batch by fine purifiation, to mixed batch of nitrocotton slagging-off deironing, and then concentrated, pack after eventually passing piston push centrifuge dehydration.Because nitric acid belongs to volatile substances, nitration mixture process for preparation, nitration reaction process, centrifugal drive sour process and boil in washed journey all can produce oxides of nitrogen gas, i.e. the smoke of gunpowder.Pollute if be directly discharged in air and waste, human body is worked the mischief, therefore must recycle.
The processing method of the smoke of gunpowder can be divided into by the kind of adsorbent: water absorption method, sour absorption process, alkali absorb method, oxides adsorb method etc.Application number be 201210512696.7 Chinese patent disclose a kind of processing method of nitrous oxides exhaust gas, the method comprises pickling unit, washing unit and caustic wash unit, up to standard by absorbing to reach toxic emission step by step; But can industrial waste salt be produced at caustic wash unit, cause secondary pollution and the nitric acid rate of recovery low; Because the smoke of gunpowder amount produced in nitrocotton production process is large, greatly, the dust technology concentration obtained by the method is low, and nitric acid user is single for the dust technology amount thus generated, and takes out difficulty, affects the normal operation that the smoke of gunpowder reclaims, and reduces the economic benefit of nitrocotton production.
Summary of the invention
Technical problem to be solved by this invention is to provide retracting device and the method for the smoke of gunpowder in a kind of nitrocotton production process, in order to avoid use Alkali absorption agent, can produce the nitric acid of two kinds of concentration simultaneously, guarantee that smoke of gunpowder recovery system is normally run.
The technical solution adopted for the present invention to solve the technical problems is: the retracting device of the smoke of gunpowder in a kind of nitrocotton production process, and in described nitrocotton production process, the retracting device of the smoke of gunpowder comprises: the first absorptive unit, the second absorptive unit, the 3rd absorptive unit, air exhauster and the first densimeter, the second densimeter; Described first absorptive unit comprises the absorption tower that absorbent is water; The absorbents that described second absorptive unit comprises at least two series connection are the absorption tower of water, are arranged on station after the first absorptive unit and series connection with it; Described 3rd absorptive unit comprises the absorption tower that at least one absorbent is urea, hydrogen peroxide mixed solution, is arranged on station after the second absorptive unit and series connection with it;
Smoke of gunpowder import, the first inlet, the first liquid outlet and the second liquid outlet is provided with bottom each absorption tower of described first absorptive unit, the second absorptive unit and the 3rd absorptive unit, top, each absorption tower is provided with smoke of gunpowder outlet, the second inlet, top, described each absorption tower smoke of gunpowder outlet is connected by pipeline with smoke of gunpowder import bottom a rear absorption tower, the first liquid outlet bottom each absorption tower is connected by pipeline with the first inlet bottom last absorption tower, and described pipeline is provided with valve; Top, the absorption tower smoke of gunpowder outlet of the 3rd absorptive unit is exhaust port; Each absorption tower arranges a circulating pump, and pump inlet is connected by pipeline with the second liquid outlet bottom described absorption tower, export and be connected by pipeline with top second, described absorption tower inlet; Described first absorptive unit absorption tower circulating-pump outlet pipeline arranges water or dust technology import; The circulating-pump outlet pipeline on described second last absorption tower of absorptive unit arranges water inlet; The circulating-pump outlet pipeline on described 3rd last absorption tower of absorptive unit arranges urea, hydrogen peroxide mixed solution import; Described air exhauster import is connected with from the smoke of gunpowder outlet in production process, and described air exhauster outlet is connected with smoke of gunpowder import bottom described first absorptive unit absorption tower;
The first liquid outlet bottom described first absorptive unit absorption tower is connected with acid output pipeline, described acid output pipeline is provided with the first densimeter, is provided with valve after described first densimeter; The first liquid outlet bottom described second absorptive unit the first two absorption tower is connected with acid output pipeline, described acid output pipeline is provided with the second densimeter, is provided with valve after described second densimeter.
Preferably, the absorption tower of described second absorptive unit is 4.
Preferably, the absorption tower of described 3rd absorptive unit is 2.
A recovery method for the smoke of gunpowder in nitrocotton production process, comprises the following steps:
(1) close the valve in the first absorptive unit and the second absorptive unit absorption tower connecting pipe, add water to the 10-30% of absorbing tower liquid-level to the first absorptive unit absorption tower, start circulating pump, water from top to bottom circulates in absorption tower;
(2) in the second each absorption tower of absorptive unit, added water to the 10-30% of absorbing tower liquid-level by water inlet on the second absorptive unit absorption tower circulating pump, start the circulating pump on described each absorption tower, water from top to bottom circulates in absorption tower;
(3) smoke of gunpowder from production process enters the absorption tower of the first absorptive unit through air exhauster by smoke of gunpowder import bottom the absorption tower of the first absorptive unit, washes; When the first pycnometer specific gravity is more than or equal to 1.37, the first densimeter late gate is opened, and goes out the nitric acid that concentration is 60%, by the water inlet moisturizing on circulating pump pipeline, makes described absorbing tower liquid-level be 10-30%;
(4) gas obtained after step (3) being processed sends into absorption tower by the smoke of gunpowder import bottom first absorption tower of the second absorptive unit, wash further, when the second pycnometer specific gravity is more than or equal to 1.18, second densimeter late gate is opened, go out the nitric acid that concentration is 30%, by the water on circulating pump pipeline or dust technology import moisturizing, described absorbing tower liquid-level is made to be 10-30%;
(5) 10-30% of mixed liquor to absorbing tower liquid-level of urea and hydrogen peroxide is injected to the 3rd absorptive unit absorption tower, start circulating pump, the inlet of mixed liquor from top, described absorption tower sprays, circulation, the gas obtained after step (4) being washed passes into the absorption tower of the 3rd absorptive unit, after absorbing process further with urea and hydrogen peroxide mixed liquor, in gas, nitrous oxides concentration is less than or equal to 800ppm, enters air.
Preferably, go out in described step (3) acid after described first absorptive unit absorbing tower liquid-level low time, open the valve in the first absorptive unit and the second absorptive unit absorption tower connecting pipe, the dust technology of the second absorptive unit is added to the absorption tower of the first absorptive unit.
Preferably, the rate of water make-up of described step (4) second absorptive unit is 400-3000L/h in process of production.
Preferably, in urea described in step (5) and hydrogen peroxide mixed liquor, the mass concentration of urea is 8-12%, and the mass concentration of hydrogen peroxide is 3-6%.
Preferably, after described step (5) process, in gas, nitrous oxides concentration is 500-800ppm.
The invention has the beneficial effects as follows: the recovery method of the smoke of gunpowder in nitrocotton production process provided by the invention, adopt multi-stage water wash process and urea, hydrogen peroxide process, industrial waste salt is not had to produce in whole processing procedure, absorb the nitric oxide that other absorbents are not easy to absorb, do not cause secondary pollution, discard and reach discharging standards; The present invention can provide the nitric acid of two kinds of concentration simultaneously, i.e. the nitric acid of 30% and 60%, and expansion nitric acid user, meets the sale demand of nitric acid product, guarantee the normal operation of smoke of gunpowder recovery system, improves the economic benefit that the smoke of gunpowder reclaims.
Accompanying drawing explanation
Fig. 1 is the structural representation of provided by the invention 21;
Be labeled as in figure: 1, the first absorptive unit, 1a, absorption tower, 11, smoke of gunpowder import, the 12, first inlet, the 13, first liquid outlet, the 14, second liquid outlet, 15, smoke of gunpowder outlet, the 16, second inlet; 2, the second absorptive unit, 2a, absorption tower, 21, smoke of gunpowder import, the 22, first inlet, the 23, first liquid outlet, the 24, second liquid outlet, 25, smoke of gunpowder outlet, the 26, second inlet; 3, the 3rd absorptive unit, 3a, urea, hydrogen peroxide mixed solution absorption tower, 31, smoke of gunpowder import, 32, the first inlet, the 33, first liquid outlet, the 34, second liquid outlet, 35, smoke of gunpowder outlet, the 36, second inlet, 4, air exhauster, 5, the first densimeter, 6, the second densimeter, 7, circulating pump, 8, water or dust technology import, 9, water inlet, 10, urea, hydrogen peroxide mixed solution import.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
Smoke of gunpowder retracting device structural representation in nitrocotton production process of the present invention as shown in Figure 1, in nitrocotton production process, the retracting device of the smoke of gunpowder comprises: the first absorptive unit 1, second absorptive unit 2, the 3rd absorptive unit 3, air exhauster 4 and the first densimeter 5, second densimeter 6; Described first absorptive unit 1 comprises the absorption tower 1a that absorbent is water; Described second absorptive unit 2 comprises the absorption tower 2a that at least two absorbents of connecting are water, is arranged on the rear station of the first absorptive unit 1 and series connection with it; Described 3rd absorptive unit 3 comprises the absorption tower 3a that at least one absorbent is urea, hydrogen peroxide mixed solution, is arranged on the rear station of the second absorptive unit 2 and series connection with it.
Described first absorptive unit 1, smoke of gunpowder import is provided with bottom each absorption tower of the second absorptive unit 2 and the 3rd absorptive unit 3, first inlet, first liquid outlet and the second liquid outlet, top, each absorption tower is provided with smoke of gunpowder outlet, second inlet, top, described each absorption tower smoke of gunpowder outlet is connected by pipeline with smoke of gunpowder import bottom a rear absorption tower, the first liquid outlet bottom each absorption tower is connected by pipeline with the first inlet bottom last absorption tower, described pipeline is provided with valve, when previous absorbing tower liquid-level is not enough, described valve open, liquid level is supplemented to previous absorption tower by a rear absorption tower, top, the absorption tower smoke of gunpowder outlet 35 of the 3rd absorptive unit 3 is exhaust port, each absorption tower arranges a circulating pump 7, and circulating pump 7 import is connected by pipeline with the second liquid outlet bottom described absorption tower, export and be connected by pipeline with top second, described absorption tower inlet, single 1 yuan of absorption tower circulating pump 7 outlet conduit of described first absorption arranges water or dust technology import 8, circulating pump 7 outlet conduit on described second last absorption tower of absorptive unit 2 arranges water inlet 9, circulating pump 7 outlet conduit on described 3rd last absorption tower of absorptive unit 3 arranges urea, hydrogen peroxide mixed solution import 10, the import of described air exhauster 4 is connected with from the smoke of gunpowder outlet in production process, and described air exhauster 4 outlet is connected with smoke of gunpowder import bottom the water absorption tower 1a of described first absorptive unit 1.
The first liquid outlet bottom described first absorptive unit 1 absorption tower is connected with acid output pipeline, described acid output pipeline is provided with the first densimeter 5, is provided with valve after described first densimeter 5; The first liquid outlet bottom described second absorptive unit 2 the first two absorption tower is connected with acid output pipeline, described acid output pipeline is provided with the second densimeter 6, is provided with valve after described second densimeter 6.
In figure, the direction of arrow is the flow direction of gas, liquid.
Embodiment 1:
As shown in Figure 1, smoke of gunpowder retracting device structural representation in nitrocotton production process of the present invention as shown in Figure 1, in nitrocotton production process, the retracting device of the smoke of gunpowder comprises: the first absorptive unit 1, second absorptive unit 2, the 3rd absorptive unit 3, air exhauster 4 and the first densimeter 5, second densimeter 6; Described first absorptive unit 1 comprises the absorption tower 1a that absorbent is water; Described second absorptive unit 2 comprises the absorption tower 2a that 4 absorbents of connecting are water, is arranged on the rear station of the first absorptive unit 1 and series connection with it; It is the absorption tower 3a of urea, hydrogen peroxide mixed solution that described 3rd absorptive unit 3 comprises to two absorbents, is arranged on station after the second absorptive unit 2 and series connection with it.
Be provided with smoke of gunpowder import 11, first inlet 12, first liquid outlet 13 and the second liquid outlet 14 bottom the water absorption tower 1a of the first absorptive unit 1, top is provided with smoke of gunpowder outlet 15, second inlet 16; Be provided with smoke of gunpowder import 21, first inlet 22, first liquid outlet 23 and the second liquid outlet 24 bottom second absorptive unit 2 water absorption tower 2a, top is provided with smoke of gunpowder outlet 25, second inlet 26; Be provided with smoke of gunpowder import 31, first inlet 32, first liquid outlet 33 and the second liquid outlet 34 bottom 3rd absorptive unit 3 water absorption tower 3a, top is provided with smoke of gunpowder outlet 35, second inlet 36.
Top, each absorption tower smoke of gunpowder outlet is connected by pipeline with smoke of gunpowder import bottom a rear absorption tower, and the first liquid outlet bottom each absorption tower is connected by pipeline with the first inlet bottom last absorption tower, and described pipeline is provided with valve; Top, the absorption tower smoke of gunpowder outlet 35 of the 3rd absorptive unit 3 is exhaust port; Each absorption tower arranges a circulating pump 7, and circulating pump 7 import is connected by pipeline with the second liquid outlet bottom described absorption tower, export and be connected by pipeline with top second, described absorption tower inlet; Single 1 yuan of absorption tower circulating pump 7 outlet conduit of described first absorption arranges water or dust technology import 8; Circulating pump 7 outlet conduit on described second last absorption tower of absorptive unit 2 arranges water inlet 9; Circulating pump 7 outlet conduit on described 3rd last absorption tower of absorptive unit 3 arranges urea, hydrogen peroxide mixed solution import 10; The import of described air exhauster 4 is connected with from the smoke of gunpowder outlet in production process, described air exhauster 4 outlet is connected with smoke of gunpowder import bottom the absorption tower 1a of described first absorptive unit 1, air exhauster 4 is power sources of process gas flowing, makes the absorption tower 1a process entering the first absorptive unit 1 from the smoke of gunpowder in production system.
The first liquid outlet 13 bottom described first absorptive unit 1 absorption tower is connected with acid output pipeline, described acid output pipeline is provided with the first densimeter 5, is provided with valve after described first densimeter 5; The first liquid outlet 23 bottom described second absorptive unit 2 the first two water absorption tower 2a is connected with acid output pipeline, described acid output pipeline is provided with the second densimeter 6, is provided with valve after described second densimeter 6.
In nitrocotton production process provided by the invention, smoke of gunpowder recovery method comprises the steps:
(1) close the valve in the first absorptive unit 1 and the second absorptive unit 2 absorption tower connecting pipe, add water to the 10-30% of absorbing tower liquid-level to the first absorptive unit 1 absorption tower, start circulating pump 7, water from top to bottom circulates in absorption tower;
(2) in the second each absorption tower of absorptive unit 2, the 10-30% of absorbing tower liquid-level is added water to by water inlet 9 on last absorption tower circulating pump 7 of the second absorptive unit 2, start the circulating pump 7 on described each absorption tower, water from top to bottom circulates in absorption tower;
(3) smoke of gunpowder from production process enters the absorption tower 1a of the first absorptive unit 1 through air exhauster 4 by smoke of gunpowder import 11 bottom the absorption tower 1a of the first absorptive unit 1, washes; When the first densimeter 5 proportion is more than or equal to 1.37, the first densimeter 5 late gate is opened, and goes out the nitric acid that concentration is 60%, by the water on circulating pump pipeline or dust technology import 8 moisturizing or dust technology, makes described absorbing tower liquid-level be 10-30%;
In this step, be only absorbed by the water from the nitrogen oxide of the overwhelming majority in the smoke of gunpowder of nitrocotton production system, generate salpeter solution, when reaction solution concentration reaches 60%, take salpeter solution away and take out, to absorption tower 1a supplementing water or dust technology, periodic duty, reaction equation is as follows:
2NO+O
2＝2NO
2、2NO
2+H
2O＝2HNO
3
Because production system is unstable, the smoke of gunpowder amount sent here is unstable, if continuous seepage 60% nitric acid, can affect the uniformity of concentration of nitric acid, therefore when smoke of gunpowder amount is less in production system, can export by temporary close 60% nitric acid, produces the nitric acid of 30%; When smoke of gunpowder amount is large and when stablize, the nitric acid of production 60%;
(4) gas obtained after step (3) being processed sends into absorption tower by the smoke of gunpowder import 21 bottom first absorption tower of the second absorptive unit 2, wash further, when the second densimeter 6 proportion is more than or equal to 1.18, second densimeter 6 late gate is opened, go out the nitric acid that concentration is 30%, by water inlet 9 moisturizing on circulating pump 7 pipeline, described absorbing tower liquid-level is made to be 10-30%;
(5) 10-30% of mixed liquor to absorbing tower liquid-level of urea and hydrogen peroxide is injected to the 3rd absorptive unit 3 absorption tower, in described urea and hydrogen peroxide mixed liquor, the mass concentration of urea is 8-12%, the mass concentration of hydrogen peroxide is 3-6%, start circulating pump 7, the inlet of mixed liquor from top, described absorption tower sprays, circulation, the gas obtained after step (4) being washed passes into the absorption tower of the 3rd absorptive unit 3, after absorbing process further with urea and hydrogen peroxide mixed liquor, in gas, nitrous oxides concentration is less than or equal to 800ppm, enters air; When the concentration of urea and hydrogen peroxide mixed liquor reduces, enters nitrous oxides concentration rising in the gas of air, the absorbing liquid of the 3rd unit 3 is discharged by the first liquid outlet, deliver to last absorption tower of the second absorptive unit 2, the 3rd absorptive unit 3 is supplemented again to the mixed liquor of urea and hydrogen peroxide;
In this step, the reaction equation of urea liquid absorbing NOx is as follows:
6NO
2+4(NH
2)
2CO＝7N
2+4CO
2+8H
2O
6NO+2(NH
2)
2CO＝5N
2+2CO
2+4H
2O
Hydrogen peroxide as oxidant, by the nitrogen dioxide that oxidation of nitric oxide becomes easily to be only absorbed by the water; Urea, hydrogen peroxide solution, as nitrogen oxide remaining in absorbent process tail gas, absorb the nitric oxide that other absorbents are not easy to absorb; Reaction product is N
2, CO
2, H
2o, and without side reaction, secondary pollution is not caused to environment.
Embodiment 2:
In nitrocotton production process provided by the invention, smoke of gunpowder retracting device such as embodiment 1, recovery method comprises the steps:
(1) valve opened in the first absorptive unit 1 and the second absorptive unit 2 absorption tower connecting pipe is closed, added water in the second absorptive unit 2 absorption tower by water inlet 9 on last absorption tower circulating pump 7 of the second absorptive unit 2, water adverse current to the first absorptive unit 1, after water absorption tower 1a liquid level reaches 10-30%, close the valve in the first absorptive unit 1 and the second absorptive unit 2 absorption tower connecting pipe, start circulating pump 7, water from top to bottom circulates in absorption tower;
(2) treat that each absorbing tower liquid-level of the second absorptive unit 2 reaches 10-30%, start the circulating pump 7 on described each absorption tower, water from top to bottom circulates in absorption tower;
(3) smoke of gunpowder from production process enters the absorption tower 1a of the first absorptive unit 1 through air exhauster 4 by smoke of gunpowder import 11 bottom the absorption tower 1a of the first absorptive unit 1, washes; When the first densimeter 5 proportion is more than or equal to 1.37,5 valve opens after first densimeter, go out the nitric acid that concentration is 60%, go out acid after described water absorption tower 1a liquid level low time, open the valve in the first absorptive unit 1 and the second absorptive unit 2 absorption tower connecting pipe, the dust technology of the second absorptive unit 2 is added to the absorption tower of the first absorptive unit, make the first absorptive unit 1 absorption tower 1a liquid level remain 10-30%;
(4) gas obtained after step (3) being processed sends into absorption tower by the smoke of gunpowder import 21 bottom first absorption tower of the second absorptive unit 2, wash further, when the second densimeter 6 proportion is more than or equal to 1.18, second densimeter 6 late gate is opened, go out the nitric acid that concentration is 30%, by water inlet 9 moisturizing on circulating pump 7 pipeline, make described absorbing tower liquid-level be 10-30%, the rate of water make-up of the second absorptive unit 2 is 400-3000L/h;
(5) by urea, the 10-30% of mixed liquor to absorbing tower liquid-level of urea and hydrogen peroxide is injected in hydrogen peroxide mixed solution import 10 to the 3rd absorptive unit 3 absorption tower, in described urea and hydrogen peroxide mixed liquor, the mass concentration of urea is 8-12%, the mass concentration of hydrogen peroxide is 3-6%, start circulating pump 7, the inlet of mixed liquor from top, described absorption tower sprays, circulation, the gas obtained after step (4) being washed passes into the absorption tower of the 3rd absorptive unit 3, after absorbing process further with urea and hydrogen peroxide mixed liquor, in gas, nitrous oxides concentration is 500-800ppm, enter air.
Claims (8)
1. the retracting device of the smoke of gunpowder in a nitrocotton production process, it is characterized in that, in described nitrocotton production process, the retracting device of the smoke of gunpowder comprises: the first absorptive unit, the second absorptive unit, the 3rd absorptive unit, air exhauster and the first densimeter, the second densimeter; Described first absorptive unit comprises the absorption tower that absorbent is water; The absorbents that described second absorptive unit comprises at least two series connection are the absorption tower of water, are arranged on station after the first absorptive unit and series connection with it; Described 3rd absorptive unit comprises the absorption tower that at least one absorbent is urea, hydrogen peroxide mixed solution, is arranged on station after the second absorptive unit and series connection with it;
Smoke of gunpowder import, the first inlet, the first liquid outlet and the second liquid outlet is provided with bottom each absorption tower of described first absorptive unit, the second absorptive unit and the 3rd absorptive unit, top, each absorption tower is provided with smoke of gunpowder outlet, the second inlet, top, described each absorption tower smoke of gunpowder outlet is connected by pipeline with smoke of gunpowder import bottom a rear absorption tower, the first liquid outlet bottom each absorption tower is connected by pipeline with the first inlet bottom last absorption tower, and described pipeline is provided with valve; Top, the absorption tower smoke of gunpowder outlet of the 3rd absorptive unit is exhaust port; Each absorption tower arranges a circulating pump, and pump inlet is connected by pipeline with the second liquid outlet bottom described absorption tower, export and be connected by pipeline with top second, described absorption tower inlet; Described first absorptive unit absorption tower circulating-pump outlet pipeline arranges water or dust technology import; The circulating-pump outlet pipeline on described second last absorption tower of absorptive unit arranges water inlet; The circulating-pump outlet pipeline on described 3rd last absorption tower of absorptive unit arranges urea, hydrogen peroxide mixed solution import; Described air exhauster import is connected with from the smoke of gunpowder outlet in production process, and described air exhauster outlet is connected with smoke of gunpowder import bottom described first absorptive unit absorption tower;
The first liquid outlet bottom described first absorptive unit absorption tower is connected with acid output pipeline, described acid output pipeline is provided with the first densimeter, is provided with valve after described first densimeter; The first liquid outlet bottom described second absorptive unit the first two absorption tower is connected with acid output pipeline, described acid output pipeline is provided with the second densimeter, is provided with valve after described second densimeter.
2. the retracting device of the smoke of gunpowder in a kind of nitrocotton production process according to claim 1, it is characterized in that, the absorption tower of described second absorptive unit is 4.
3. the retracting device of the smoke of gunpowder in a kind of nitrocotton production process according to claim 1, it is characterized in that, the absorption tower of described 3rd absorptive unit is 2.
4. the recovery method of the smoke of gunpowder in nitrocotton production process, is characterized in that, comprise the following steps:
(1) close the valve in the first absorptive unit and the second absorptive unit absorption tower connecting pipe, add water to the 10-30% of absorbing tower liquid-level to the first absorptive unit absorption tower, start circulating pump, water from top to bottom circulates in absorption tower;
(2) in the second each absorption tower of absorptive unit, added water to the 10-30% of absorbing tower liquid-level by water inlet on the second absorptive unit absorption tower circulating pump, start the circulating pump on described each absorption tower, water from top to bottom circulates in absorption tower;
(3) smoke of gunpowder from production process enters the absorption tower of the first absorptive unit through air exhauster by smoke of gunpowder import bottom the absorption tower of the first absorptive unit, washes; When the first pycnometer specific gravity is more than or equal to 1.37, the first densimeter late gate is opened, and goes out the nitric acid that concentration is 60%, by the water inlet moisturizing on circulating pump pipeline, makes described absorbing tower liquid-level be 10-30%;
(4) gas obtained after step (3) being processed sends into absorption tower by the smoke of gunpowder import bottom first absorption tower of the second absorptive unit, wash further, when the second pycnometer specific gravity is more than or equal to 1.18, second densimeter late gate is opened, go out the nitric acid that concentration is 30%, by the water on circulating pump pipeline or dust technology import moisturizing, described absorbing tower liquid-level is made to be 10-30%;
(5) 10-30% of mixed liquor to absorbing tower liquid-level of urea and hydrogen peroxide is injected to the 3rd absorptive unit absorption tower, start circulating pump, the inlet of mixed liquor from top, described absorption tower sprays, circulation, the gas obtained after step (4) being washed passes into the absorption tower of the 3rd absorptive unit, after absorbing process further with urea and hydrogen peroxide mixed liquor, in gas, nitrous oxides concentration is less than or equal to 800ppm, enters air.
5. the recovery method of the smoke of gunpowder in a kind of nitrocotton production process according to claim 4, it is characterized in that, go out in described step (3) acid after described first absorptive unit absorbing tower liquid-level low time, open the valve in the first absorptive unit and the second absorptive unit absorption tower connecting pipe, the dust technology of the second absorptive unit is added to the absorption tower of the first absorptive unit.
6. the recovery method of the smoke of gunpowder in a kind of nitrocotton production process according to claim 4, it is characterized in that, the rate of water make-up of described step (4) second absorptive unit is 400-3000L/h in process of production.
7. the recovery method of the smoke of gunpowder in a kind of nitrocotton production process according to claim 4, is characterized in that, in urea described in step (5) and hydrogen peroxide mixed liquor, the mass concentration of urea is 8-12%, and the mass concentration of hydrogen peroxide is 3-6%.
8. the recovery method of the smoke of gunpowder in a kind of nitrocotton production process according to claim 7, is characterized in that, after described step (5) process, in gas, nitrous oxides concentration is 500-800ppm.
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| CN111620397A (en) * | 2020-06-24 | 2020-09-04 | 山东友道化学有限公司 | Treatment system and treatment method for nitric acid-containing system |
| CN111792631A (en) * | 2020-06-24 | 2020-10-20 | 山东友道化学有限公司 | Device and method for treating nitric acid containing high-boiling-point organic matters |
| CN112823853A (en) * | 2019-11-20 | 2021-05-21 | 中昊晨光化工研究院有限公司 | Method and device for treating nitrogen oxides in tail gas generated by plasma cracking of organic fluorine |
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| CN106215627A (en) * | 2016-08-30 | 2016-12-14 | 安徽金禾实业股份有限公司 | A kind of method of hydrogen peroxide liquid oxidatively absorption process treatment of nitric acid tail gas |
| CN108404629A (en) * | 2018-02-01 | 2018-08-17 | 高博集团有限公司 | A kind of filter case phosphatization exhaust treatment system |
| CN110605004A (en) * | 2019-08-30 | 2019-12-24 | 南京鹳山化工科技有限公司 | Internode external circulation low-pressure multistage smoke absorption device and process |
| CN112823853A (en) * | 2019-11-20 | 2021-05-21 | 中昊晨光化工研究院有限公司 | Method and device for treating nitrogen oxides in tail gas generated by plasma cracking of organic fluorine |
| CN111620397A (en) * | 2020-06-24 | 2020-09-04 | 山东友道化学有限公司 | Treatment system and treatment method for nitric acid-containing system |
| CN111792631A (en) * | 2020-06-24 | 2020-10-20 | 山东友道化学有限公司 | Device and method for treating nitric acid containing high-boiling-point organic matters |
| CN111792631B (en) * | 2020-06-24 | 2023-08-18 | 山东友道化学有限公司 | Device and method for treating nitric acid containing high-boiling-point organic matters |
| CN111620397B (en) * | 2020-06-24 | 2023-08-25 | 山东友道化学有限公司 | Treatment system and treatment method for nitric acid-containing system |
| CN116550139A (en) * | 2023-05-09 | 2023-08-08 | 南通泰利达化工有限公司 | Waste gas purifying and recycling equipment for nitrocotton production |
| CN116550139B (en) * | 2023-05-09 | 2024-04-26 | 南通泰利达化工有限公司 | Waste gas purifying and recycling equipment for nitrocotton production |
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