CN108176203A - Ferric oxide red colorant second oxidation technology waste gas processing method - Google Patents
Ferric oxide red colorant second oxidation technology waste gas processing method Download PDFInfo
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- CN108176203A CN108176203A CN201711476831.6A CN201711476831A CN108176203A CN 108176203 A CN108176203 A CN 108176203A CN 201711476831 A CN201711476831 A CN 201711476831A CN 108176203 A CN108176203 A CN 108176203A
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D2251/304—Alkali metal compounds of sodium
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- B01D2251/506—Sulfuric acid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2251/00—Reactants
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Abstract
The present invention relates to a kind of ferric oxide red colorant second oxidation technology waste gas processing methods, include the following steps：Step 1：The steam and iron oxide red particle that are gone in removing exhaust gas using the cooling method that exchanges heat and generate level-one exhaust gas；Step 2：Using eliminating N2O4Concentrated nitric acid the NO in level-one exhaust gas is oxidized to NO2And generate two level exhaust gas；Step 3：Using eliminating N2O4Dust technology tentatively remove NO in two level exhaust gas2Three-level exhaust gas is generated with NO；Step 4：The NO in three-level exhaust gas is further removed using sodium hydroxide solution2Level Four exhaust gas is generated with NO；Step 5：Using urea liquid by the NO in level Four exhaust gas2It is reduced to N2And Pyatyi exhaust gas is generated, Pyatyi exhaust gas reaches discharge standard.The present invention can improve the oxidizability of exhaust-gas treatment, improve the absorption efficiency of exhaust-gas treatment so that final exhaust gas disclosure satisfy that discharge standard.
Description
Technical field
The invention belongs to industrial waste gas process fields, and in particular to a kind of that ferric oxide red colorant second oxidation technique is generated
The method that is handled of the exhaust gas containing nitrogen oxides.
Background technology
During the second oxidation of ferric oxide red colorant, the device of the second oxidation technique is carried out --- the master in oxidation barrel
Raw material is wanted to include：Water, iron sheet, ferrous nitrate, ferrous sulfate, while in oxidation reaction process, constantly it is passed through steam and air.
Fe (No during second oxidation3)2It is oxidized to Fe (ON)3Shi Shengcheng nitric acid：
Due to the presence of nitric acid (dust technology), second oxidation while, generates side reaction：
Therefore, containing a certain amount of NO gases in oxidation barrel exhaust gas, simultaneously because needing to add in steam during second oxidation so that
The air blasted in exhaust gas containing a large amount of water vapours and air compressor machine.
Further, since constantly generate iron oxide red particle in oxidation barrel, steam and air are in oxidation barrel during rapid increase, by oxygen
The micro iron oxide red particle changed in bucket carries out so that contains micro iron oxide red particle in oxidation barrel exhaust gas.Therefore, iron oxide red oxidation barrel
Exhaust gas main component：Steam, air, oxynitrides and micro iron oxide red particle.
Nitrous oxides exhaust gas processing --- concentrated nitric acid oxidation+dust technology absorption is a kind of common in current exhaust-gas treatment
Absorb the mode of soluble exhaust gas.Since nitric oxide is not soluble in water, needs to be oxidized to nitrogen dioxide by concentrated nitric acid, make
NO in tail gasXOxidizability >=50%.One of factor for influencing oxidizability is N in nitric acid2O4Content rise so that NO's
Oxidizability declines.Influence oxidizability factor second is that superficial linear velocity in a column, usual tower diameter is in Φ 3200 hereinafter, with production iron oxide red
Ability second oxidation bucket offgas discharge amount at least in 30000m3/ h, superficial linear velocity in a column is more than 1 meter per second.It is other to influence oxidation
Degree factor also has：Concentration of nitric acid, NOXInitial concentration etc..Therefore, offgas discharge amount is such as during iron oxide red second oxidation
This is big, nitrous oxides concentration 2000mg/m3Under conditions of, emission-control equipment common at present, as superficial linear velocity in a column is more than 1
The emission-control equipment of meter per second, absorptivity are less than 80%.If chimney breast highest allows concentration of emission to press current standard
GB16297-1996 is 240mg/m3, then the minimum absorptivity of qualified discharge is more than 88%, therefore existing exhaust-gas treatment fills
Emissions requirements cannot be met with method by putting.
Invention content
The object of the present invention is to provide a kind of raising exhaust treatment efficiencies so that treated, and exhaust gas can reach discharge mark
Accurate ferric oxide red colorant second oxidation technology waste gas processing method.
In order to achieve the above objectives, the technical solution adopted by the present invention is：
A kind of ferric oxide red colorant second oxidation technology waste gas processing method, for handling two step oxygen of ferric oxide red colorant
Exhaust gas caused by chemical industry skill, the ferric oxide red colorant second oxidation technology waste gas processing method include the following steps：
Step 1：Level-one exhaust gas is generated using the steam in the cooling method removal exhaust gas that exchanges heat and iron oxide red particle；
Step 2：Using eliminating N2O4Concentrated nitric acid the NO in the level-one exhaust gas is oxidized to NO2And it generates two level and gives up
Gas；
Step 3：Using eliminating N2O4Dust technology tentatively remove NO in the two level exhaust gas2Three-level is generated with NO
Exhaust gas；
Step 4：The NO in the three-level exhaust gas is further removed using sodium hydroxide solution2It generates level Four with NO and gives up
Gas；
Step 5：Using urea liquid by the NO in the level Four exhaust gas2It is reduced to N2And Pyatyi exhaust gas is generated, the Pyatyi
Exhaust gas reaches discharge standard.
Preferably, in the step 1, heat exchange cooling is carried out to the exhaust gas using water cycle.
Preferably, it in the step 2, first sprays concentrated nitric acid and is blown away using the compressed gas with its counter current contacting described dense
N in nitric acid2O4, then spray and eliminate N2O4Concentrated nitric acid make it that the level-one be given up with the level-one exhaust gas counter current contacting
NO in gas is oxidized to NO2And generate the two level exhaust gas.
Preferably, it in the step 3, first sprays dust technology and is blown away using the compressed gas with its counter current contacting described dilute
N in nitric acid2O4, then spray and eliminate N2O4Dust technology make it that the two level be given up with the two level exhaust gas counter current contacting
NO in gas is oxidized to NO2And generate the three-level exhaust gas.
Preferably, it is sprayed again after first condensing the dust technology.
Preferably, in the step 4, spraying the sodium hydroxide solution makes it be gone with the three-level exhaust gas counter current contacting
Except the NO in the three-level exhaust gas2And NO, generate the level Four exhaust gas.
Preferably, the sodium hydroxide solution is first heated to spray again.
Preferably, in the step 5, spraying the urea liquid makes it with the level Four exhaust gas counter current contacting and by described in
NO in level Four exhaust gas2It is reduced to N2, generate the Pyatyi exhaust gas.
Preferably, the ferric oxide red colorant second oxidation technology waste gas processing method further includes step 6：By the Pyatyi
Exhaust gas discharges after clear water washing dehydration.
Preferably, the mass percent concentration of the concentrated nitric acid is 44%~47%；The mass percent of the dust technology
A concentration of 15%~30%；The mass percent concentration of the sodium hydroxide solution is 15%~30%；The urea liquid
Mass percent concentration is 8%~12%, and pH value is 1~3.
Since above-mentioned technical proposal is used, the present invention has following advantages compared with prior art：The present invention can improve
The oxidizability of exhaust-gas treatment improves the absorption efficiency of exhaust-gas treatment so that final exhaust gas disclosure satisfy that discharge standard.
Description of the drawings
The structure diagram of ferric oxide red colorant second oxidation technology waste gas processing unit that attached drawing 1 is used for the present invention.
Pipe heat exchanger in the ferric oxide red colorant second oxidation technology waste gas processing unit that attached drawing 2 is used for the present invention
Structure diagram.
Concentrated nitric acid oxidation tower in the ferric oxide red colorant second oxidation technology waste gas processing unit that attached drawing 3 is used for the present invention
Structure diagram.
Dust technology absorption tower in the ferric oxide red colorant second oxidation technology waste gas processing unit that attached drawing 4 is used for the present invention
Structure diagram.
Sodium hydroxide absorbs in the ferric oxide red colorant second oxidation technology waste gas processing unit that attached drawing 5 is used for the present invention
The structure diagram of tower.
Urea liquid absorbs in the ferric oxide red colorant second oxidation technology waste gas processing unit that attached drawing 6 is used for the present invention
The structure diagram of tower.
In the figures above：
1st, pipe heat exchanger；11st, medium circulation pipeline；12nd, heat exchange columns；13rd, cooling tower；14th, drain pipe；15th, positive displacement pump；
2nd, concentrated nitric acid oxidation tower；21st, concentrated nitric acid oxidation tower tower body；22nd, concentrated nitric acid oxidation tower tower；23rd, concentrated nitric acid oxidation
Tower king-tower；24th, concentrated nitric acid oxidation tower jet head sets；25th, concentrated nitric acid oxidation tower filler；26th, concentrated nitric acid oxidation tower spray head group；
27th, the main filler of concentrated nitric acid oxidation tower；28th, concentrated nitric acid oxidation tower high pressure blower；29th, concentrated nitric acid circulating slot；
3rd, dust technology absorption tower；31st, dust technology absorption tower tower body；32nd, dust technology absorption tower Zi Ta；33rd, dust technology absorbs
Tower king-tower；34th, the sub- jet head sets in dust technology absorption tower；35th, the sub- filler in dust technology absorption tower；36th, dust technology absorption tower spray head group；
37th, the main filler in dust technology absorption tower；38th, dust technology absorption tower high pressure blower；39th, dust technology circulating slot；30th, condenser；
4th, sodium hydroxide absorption tower；41st, sodium hydroxide absorption tower tower body；42nd, sodium hydroxide absorption tower jet head sets；43rd, hydrogen
Sodium oxide molybdena absorbs tower packing；44th, sodium hydroxide circulating slot；45th, heater；
5th, urea liquid absorption tower；51st, urea liquid absorption tower tower body；52nd, urea liquid absorption tower jet head sets；53rd, it urinates
Plain solution absorbs tower packing；54th, urea liquid circulating slot；
6th, air-introduced machine；
7th, chimney.
Specific embodiment
The invention will be further described for shown embodiment below in conjunction with the accompanying drawings.
Embodiment one：(the alternatively referred to as NO of exhaust gas caused by the second oxidation technique of ferric oxide red colorantXTail gas) master
Ingredient is wanted to include steam, air, oxynitrides and micro iron oxide red particle.A kind of iron oxide handled above-mentioned exhaust gas
As shown in Figure 1, it includes sequentially connected pipe heat exchanger 1, concentrated nitric acid to red pigment second oxidation technology waste gas processing unit
Oxidizing tower 2, dust technology absorption tower 3, sodium hydroxide absorption tower 4, urea liquid absorption tower 5.
As shown in Figure 2, device of the pipe heat exchanger 1 with carrying out second oxidation technique, i.e. oxidation barrel are connected and input
Pending exhaust gas is used for the steam gone in removing exhaust gas by the cooling method that exchanges heat and iron oxide red particle to generate level-one exhaust gas.
Pipe heat exchanger 1 includes the heat absorbing end being connected by medium circulation pipeline 11 and release end of heat, the heat exchange used in the present embodiment
Medium is water, then medium circulation pipeline 11 is circulating water pipe.Heat absorbing end includes being provided with certain media circulation line 11
Heat exchange columns 12, the heat exchange columns 12 have 12 gas vent of 12 gas access of heat exchange columns and heat exchange columns, 12 gas access of heat exchange columns into
The device of row second oxidation technique is connected, so as to input pending give up into heat exchange columns 12 from 12 gas access of heat exchange columns
Gas.After exhaust gas is input in heat exchange columns 12, it is in contact and exchanges heat with medium circulation pipeline 11 therein so that exhaust gas cools down, and
Then temperature increases heat transferring medium.In this process, the steam in exhaust gas forms condensed water and falls on after carrying the cooling of iron oxide red particle
The bottom of heat exchange columns 12 so as to remove the steam and iron oxide red particle in removing exhaust gas, and then eliminates the exhaust gas of steam and iron oxide red particle
It forms level-one exhaust gas and is discharged by 12 gas vent of heat exchange columns.In order to improve heat exchange efficiency, heat exchange columns 12 can be set to
In certain media circulation line 11 on be provided with several fins, so as to increase heat exchange area.12 bottom of heat exchange columns can also be set
Drain pipe 14 is put, drain pipe 14 is connected with carrying out the device of second oxidation technique, and positive displacement pump 15 is set on drain pipe 14,
Condensed water can be then transmitted back in the device for carrying out second oxidation technique by the drain pipe 14 and positive displacement pump 15.It is changed with exhaust gas
Heat transferring medium after heat flows into release end of heat via medium circulation pipeline 11.Release end of heat is followed including being provided with other part medium
The cooling tower 13 on endless tube road 11, when medium cools down again in cooling tower 13 of the heat absorbing end heating Posterior circle to release end of heat, after cooling
It is recycled to heat absorbing end.Circulating pump is provided on medium circulation pipeline 11, realizes heat transferring medium in medium by the circulating pump
Circulating in circulation line 11.
As shown in Figure 3, concentrated nitric acid oxidation tower 2 is connected with heat exchanger and inputs level-one exhaust gas, the concentrated nitric acid oxidation tower 2
For the NO in level-one exhaust gas to be oxidized to NO2And generate two level exhaust gas.Concentrated nitric acid oxidation tower 2 includes concentrated nitric acid oxidation tower tower
22 and concentrated nitric acid oxidation tower king-tower 23.Concentrated nitric acid oxidation tower tower 22 is used to remove the N in concentrated nitric acid2O4, and concentrated nitric acid oxidation tower
King-tower 23 is then used to utilize to eliminate N2O4Concentrated nitric acid the NO in level-one exhaust gas is oxidized to NO2And generate two level exhaust gas.In order to
Simplify device, generally use following scheme：Concentrated nitric acid oxidation tower 2 includes concentrated nitric acid oxidation tower tower body 21 and is set to concentrated nitric acid
Oxidizing tower clamping plate in oxidizing tower tower body 21, concentrated nitric acid oxidation tower tower body 21 more than oxidizing tower clamping plate form concentrated nitric acid oxidation tower
Sub- tower 22, the concentrated nitric acid oxidation tower tower body 21 below oxidizing tower clamping plate form concentrated nitric acid oxidation tower king-tower 23.
It is laminated in concentrated nitric acid oxidation tower tower 22 and is provided at least two layers (such as three layers) concentrated nitric acid oxidation tower jet head sets 24,
Every layer of concentrated nitric acid oxidation tower jet head sets 24 are made of several equally distributed sub- nozzles of concentrated nitric acid, concentrated nitric acid oxidation tower nozzle
Group 24 is used to spray concentrated nitric acid.Every layer of 24 lower section of concentrated nitric acid oxidation tower jet head sets is both provided with one layer of concentrated nitric acid oxidation tower and fills out
Material 25, the concentrated nitric acid oxidation tower filler 25 is using the material of resistance to concentrated nitric acid, such as ceramic packing.Concentrated nitric acid oxidation tower tower 22
Bottom is provided with concentrated nitric acid oxidation tower gas tip, and concentrated nitric acid oxidation tower gas tip is with being arranged on concentrated nitric acid oxidation tower tower 22
External concentrated nitric acid oxidation tower high pressure blower 28 is connected, so as to be used for using the ejection of concentrated nitric acid oxidation tower gas tip
Blow away the N in concentrated nitric acid2O4Compressed gas.When concentrated nitric acid oxidation tower tower 22 and concentrated nitric acid oxidation tower king-tower 23 are arranged at
It is dense in same concentrated nitric acid oxidation tower tower body 21, and when concentrated nitric acid oxidation tower tower 22 is located at concentrated nitric acid oxidation tower 23 top of king-tower
Nitric acid oxidation tower gas tip is then arranged on the middle part of concentrated nitric acid oxidation tower tower body 21, by being arranged on concentrated nitric acid oxidation tower tower body
The pipeline at 21 middle parts is connected with concentrated nitric acid oxidation tower high pressure blower 28.
It is laminated in concentrated nitric acid oxidation tower king-tower 23 and is provided at least two layers (such as three layers) concentrated nitric acid oxidation tower spray head group 26,
Every layer of concentrated nitric acid oxidation tower spray head group 26 is made of several equally distributed concentrated nitric acid spray heads, concentrated nitric acid oxidation tower spray head
Group 26 eliminates N for spraying2O4Concentrated nitric acid.Every layer of 26 lower section of concentrated nitric acid oxidation tower spray head group is both provided with one layer of dense nitre
The main filler 27 of acid oxidase tower, the main filler 27 of the concentrated nitric acid oxidation tower is using the material of resistance to concentrated nitric acid, such as ceramic packing.
The bottom of concentrated nitric acid oxidation tower king-tower 23, which is provided with, to be connected with 12 gas vent of heat exchange columns and inputs level-one exhaust gas
Concentrated nitric acid oxidation tower gas access, and the top of concentrated nitric acid oxidation tower tower 22 be then provided with output two level exhaust gas concentrated nitric acid
Oxidizing tower gas vent.At concentrated nitric acid oxidation tower gas access, it is respectively arranged at concentrated nitric acid oxidation tower gas tip and makes gas
Uniformly distributed concentrated nitric acid oxidation tower air flow method component.Concentrated nitric acid oxidation tower gas outlet is provided with concentrated nitric acid oxidation tower demisting
Device.
In addition, the bottom of concentrated nitric acid oxidation tower king-tower 23 be additionally provided with detection concentrated nitric acid concentration concentrated nitric acid detection device,
The concentrated nitric acid for being connected with concentrated nitric acid detection device and concentrated nitric acid being automatically replenished according to the concentration of the concentrated nitric acid of its detection is mended automatically
Liquid device.
In above-mentioned concentrated nitric acid oxidation tower 2, the bottom of concentrated nitric acid oxidation tower king-tower 23 is connected to concentrated nitric acid oxidation tower by the road
Each layer concentrated nitric acid oxidation tower jet head sets 24 in sub- tower 22, the bottom of concentrated nitric acid oxidation tower tower 22 is connected to by the road to be placed in
Concentrated nitric acid circulating slot 29 outside concentrated nitric acid oxidation tower tower body 21, concentrated nitric acid circulating slot 29 are connected to concentrated nitric acid oxidation tower master by the road
Each layer concentrated nitric acid oxidation tower spray head group 26 in tower 23, so as to form concentrated nitric acid circulation path.It is set on concentrated nitric acid circulation path
It is equipped with the concentrated nitric acid circulator for concentrated nitric acid to be driven to be recycled in concentrated nitric acid circulation path.Concentrated nitric acid circulation path and dense nitre
Sour circulator collectively forms the concentrated nitric acid circulatory system.
As shown in Figure 4, dust technology absorption tower 3 is connected with concentrated nitric acid oxidation tower 2 and inputs two level exhaust gas, the dust technology
Absorption tower 3 is used to tentatively remove the NO in two level exhaust gas by dust technology2Three-level exhaust gas is generated with NO.Dust technology absorption tower 3
Including the sub- tower 32 in dust technology absorption tower and dust technology absorption tower king-tower 33.The sub- tower 32 in dust technology absorption tower is used to remove in dust technology
N2O4, and dust technology absorption tower king-tower 33 is then used to utilize to eliminate N2O4Dust technology removal two level exhaust gas in NO2And NO
And generate three-level exhaust gas.In order to simplify device, generally use following scheme：Dust technology absorption tower 3 includes dust technology absorbing tower
Body 31 and the absorption tower clamping plate being set in dust technology absorption tower tower body 31, dust technology absorbing tower more than absorption tower clamping plate
Body 31 forms the sub- tower 32 in dust technology absorption tower, and the dust technology absorption tower tower body 31 below the clamping plate of absorption tower forms dust technology absorption tower
King-tower 33.
It is laminated in the sub- tower 32 in dust technology absorption tower and is provided at least two layers sub- jet head sets 34 in (such as three layers) dust technology absorption tower,
The sub- jet head sets 34 in every layer of dust technology absorption tower are made of several equally distributed sub- nozzles of dust technology, the sub- nozzle in dust technology absorption tower
Group 34 is used to spray dust technology.Sub- 34 lower section of jet head sets in every layer of dust technology absorption tower is both provided with one layer of dust technology absorption tower and fills out
Material 35, the sub- filler 35 in the dust technology absorption tower is using the material of resistance to dust technology, such as polypropylene filler.The sub- tower 32 in dust technology absorption tower
Bottom be provided with dust technology absorption tower gas tip, dust technology absorption tower gas tip and be arranged on dust technology absorption tower Zi Ta
Dust technology absorption tower high pressure blower 38 outside 32 is connected, and is used so as to be sprayed using dust technology absorption tower gas tip
In blowing away the N in dust technology2O4Compressed gas.When the sub- tower 32 in dust technology absorption tower and dust technology absorption tower king-tower 33 are respectively provided with
In same dust technology absorption tower tower body 31, and when the sub- tower 32 in dust technology absorption tower is located at dust technology absorption tower 33 top of king-tower,
Dust technology absorption tower gas tip is then arranged on the middle part of dust technology absorption tower tower body 31, by being arranged on dust technology absorbing tower
The pipeline at 31 middle part of body is connected with dust technology absorption tower high pressure blower 38.
It is laminated in dust technology absorption tower king-tower 33 and is provided at least two layers (such as three layers) dust technology absorption tower spray head group 36,
Every layer of dust technology absorption tower spray head group 36 is made of several equally distributed dust technology spray heads, dust technology absorption tower spray head
Group 36 eliminates N for spraying2O4Dust technology.Every layer of 36 lower section of dust technology absorption tower spray head group is both provided with one layer of dilute nitre
The main filler 37 of acid absorption column, the main filler 37 in the dust technology absorption tower is using the material of resistance to dust technology, such as polypropylene filler.
The bottom of dust technology absorption tower king-tower 33, which is provided with, to be connected with concentrated nitric acid oxidation tower gas vent and inputs two level
3 gas access of dust technology absorption tower of exhaust gas, and the top of the sub- tower 32 in dust technology absorption tower is provided with the dilute of output three-level exhaust gas
3 gas vent of nitric acid absorber.It is respectively arranged at 3 gas access of dust technology absorption tower, at the gas tip of dust technology absorption tower
Make the dust technology absorption tower air flow method component of even gas distribution.Dust technology oxidizing tower gas outlet is provided with dust technology absorption tower
Demister.
The bottom of dust technology absorption tower king-tower 33 is additionally provided with the dust technology detection device of detection dust technology concentration and dilute nitre
Sour detection device is connected and is automatically replenished the dust technology automatic liquid supply device of dust technology according to the concentration of the dust technology of its detection.
In above-mentioned dust technology absorption tower 3, the bottom of dust technology absorption tower king-tower 33 is connected to dust technology absorption tower by the road
The sub- jet head sets 34 in each layer dust technology absorption tower in sub- tower 32, the bottom of the sub- tower 32 in dust technology absorption tower is connected to by the road to be placed in
Dust technology circulating slot 39 outside dust technology absorption tower tower body 31, dust technology circulating slot 39 are connected to dust technology absorption tower master by the road
Each layer dust technology absorption tower spray head group 36 in tower 33, so as to form dust technology circulation path, sets on dust technology circulation path
It is equipped with the dust technology circulator for dust technology to be driven to be recycled in dust technology circulation path.Dust technology circulation path and dilute nitre
Sour circulator collectively forms the dust technology circulatory system.
Also, the bottom of dust technology absorption tower king-tower 33 and each layer dust technology absorption tower in the sub- tower 32 in dust technology absorption tower
The condenser 30 for cooling down dust technology is provided between sub- jet head sets 34.
As shown in Figure 5, sodium hydroxide absorption tower 4 is connected with dust technology absorption tower 3 and inputs three-level exhaust gas, the hydrogen-oxygen
Change sodium absorption tower 4 to be used to further remove the NO in three-level exhaust gas by sodium hydroxide solution2Level Four exhaust gas is generated with NO.Hydrogen
Sodium oxide molybdena absorption tower 4 includes sodium hydroxide absorption tower tower body 41, is stacked in sodium hydroxide absorption tower tower body 41 at least
Two layers of (such as five layers) sodium hydroxide absorption tower jet head sets 42, every layer of sodium hydroxide absorption tower jet head sets 42 are by several equally distributed
Sodium hydroxide solution nozzle is formed, and sodium hydroxide absorption tower jet head sets 42 are used to spray sodium hydroxide solution.Every layer of sodium hydroxide
Jet head sets 42 lower section in absorption tower is both provided with one layer of sodium hydroxide and absorbs tower packing 43, such as polypropylene filler.Sodium hydroxide is inhaled
The bottom for receiving tower tower body 41 is provided with the sodium hydroxide suction for being connected and inputting three-level exhaust gas with 3 gas vent of dust technology absorption tower
Tower gas access is received, the top of sodium hydroxide absorption tower tower body 41 is provided with the sodium hydroxide absorption tower gas of output level Four exhaust gas
Outlet.Being provided at the gas access of sodium hydroxide absorption tower makes the sodium hydroxide absorption tower air flow method component of even gas distribution.Hydrogen
Sodium oxide molybdena absorption tower gas outlet is provided with sodium hydroxide absorption tower demisting device.
The bottom of sodium hydroxide absorption tower tower body 41 is connected to each layer sodium hydroxide absorption tower jet head sets 42 by the road and shape
Into sodium hydroxide circulation line, it is provided with that sodium hydroxide solution is driven to recycle in sodium hydroxide on sodium hydroxide circulation line
The sodium hydroxide circulator recycled in pipeline.Sodium hydroxide circulation line and sodium hydroxide circulator collectively form hydroxide
The sodium circulatory system.
In sodium hydroxide circulation line, the bottom of sodium hydroxide absorption tower tower body 41 and each layer sodium hydroxide absorption tower nozzle
Sodium hydroxide circulating slot 44 and the heater 45 for heating sodium hydroxide solution are provided between group 42.
The sodium hydroxide that the bottom of sodium hydroxide absorption tower tower body 41 is additionally provided with the concentration of detection sodium hydroxide solution is molten
Liquid detection device is connected with sodium hydroxide solution detection device and is mended automatically according to the concentration of the sodium hydroxide solution of its detection
It is flushed with hydrogen the sodium hydroxide solution automatic liquid supply device of sodium hydroxide solution.
As shown in Figure 6, urea liquid absorption tower 5 is connected with sodium hydroxide absorption tower 4 and inputs level Four exhaust gas, the urine
Plain solution absorption tower 5 is used to pass through urea liquid by the NO in level Four exhaust gas2It is reduced to N2And generate Pyatyi exhaust gas.Urea liquid
Absorption tower 5 includes urea liquid absorption tower tower body 51, at least two layers be stacked in urea liquid absorption tower tower body 51 (such as
Five layers) urea liquid absorption tower jet head sets 52, every layer of urea liquid absorption tower jet head sets 52 are molten by several equally distributed urea
Liquid nozzle is formed, and urea liquid absorption tower jet head sets 52 are used to spray urea liquid.Every layer of urea liquid absorption tower jet head sets 52
Lower section is both provided with one layer of urea liquid and absorbs tower packing 53.The bottom of urea liquid absorption tower tower body 51 is provided with and hydroxide
Sodium absorption tower gas vent is connected and inputs the urea liquid absorption tower gas access of level Four exhaust gas, urea liquid absorption tower gas
Body inlet is provided with the urea liquid absorption tower air flow method component for making even gas distribution.The top of urea liquid absorption tower tower body 51
The fixed urea liquid absorption tower gas vent for being equipped with output Pyatyi exhaust gas.
The bottom of urea liquid absorption tower tower body 51 is connected to each layer urea liquid absorption tower jet head sets 52 by the road and shape
Into urea liquid circulation line, it is provided with to drive urea liquid in urea liquid circulation line on urea liquid circulation line
The urea liquid circulator of middle cycle.Urea liquid circulation line and urea liquid circulator collectively form urea liquid and follow
Loop system.In urea liquid circulation line, the bottom of urea liquid absorption tower tower body 51 and each layer urea liquid absorption tower nozzle
Urea liquid circulating slot 54 is provided between group 52.
Urea liquid absorption tower 5 is connected to chimney 7, i.e. urea liquid absorption tower gas vent is connected to chimney 7.Urea is molten
It is provided between liquid absorption tower 5 and chimney 7 for the clear water wash mill of dehydration and air-introduced machine 6.
It is used to handle ferric oxide red colorant used by above-mentioned ferric oxide red colorant second oxidation technology waste gas processing unit
Second oxidation technique caused by the method for exhaust gas include the following steps：
Step 1：The steam and iron oxide red particle that are gone in removing exhaust gas using the cooling method that exchanges heat and generate level-one exhaust gas.
The step 1 carries out in pipe heat exchanger 1.The exhaust gas that ferric oxide red colorant second oxidation technique generates is by carry out oxygen
Change the device of iron oxide red pigment second oxidation technique --- oxidation barrel is discharged, and the pressure of the exhaust gas is about 1000Pa, and temperature is about 80
DEG C, NOXInitial concentration 2000mg/m3, tolerance 30000m3/h.The exhaust gas is input in pipe heat exchanger 1, then is changed in tubular type
It in the heat exchange columns 12 of hot 1 heat absorbing end of device, is exchanged heat and is cooled down with the heat transferring medium of low temperature, the steam in exhaust gas carries iron oxide red
Grain is condensed into condensed water and passes through drain pipe 14 and positive displacement pump 15 is transmitted back in the device for carrying out second oxidation technique.The temperature of exhaust gas
Degree drops to 40 DEG C hereinafter, being about 18000m after the cooling of exhaust gas tolerance by about 80 DEG C of valencys3/ h, only former exhaust gas tolerance 30000m3/ h's
60%.Level-one exhaust gas is formed after the exhaust gas tolerance for removing 40% through pipe heat exchanger 1.In the present embodiment, water cycle pair is utilized
Exhaust gas carries out heat exchange cooling.
In the step 1, due to a large amount of steam in exhaust gas being made to condense to 40 DEG C or so using pipe heat exchanger 1, it can reduce
The temperature of exhaust gas and exhaust gas total amount remove liquid (iron oxide red particle) impurity in exhaust gas, further reduced superficial linear velocity in a column, are promoted
The treatment effeciency of subsequent processing steps, and condensed water is transmitted back to oxidation barrel in time avoids waste.
Step 2：Using eliminating N2O4Concentrated nitric acid the NO in level-one exhaust gas is oxidized to NO2And generate two level exhaust gas.
The step 2 carries out in concentrated nitric acid oxidation tower 2.Configuration quality percent concentration is 44%~47%, temperature is less than
Or the concentrated nitric acid equal to 40 DEG C is passed through in the kerve of 21 bottom of concentrated nitric acid oxidation tower tower body under the action of concentrated nitric acid circulator
Concentrated nitric acid is sent to each layer concentrated nitric acid oxidation tower jet head sets 24 into concentrated nitric acid oxidation tower tower 22 by concentrated nitric acid circulation line
It is sprayed, concentrated nitric acid is sprayed on each layer concentrated nitric acid oxidation tower filler 25, while is utilizing concentrated nitric acid oxidation tower height drum pressure
Wind turbine 28 blasts compressed gas (such as compressed air) into concentrated nitric acid oxidation tower tower 22, and compressed gas is in concentrated nitric acid oxidation tower
Rise in tower 22, so as to utilize the concentrated nitric acid of spray and the compressed gas with its counter current contacting in concentrated nitric acid oxidation tower tower 22
Blow away the N in concentrated nitric acid2O4, its content is made to be less than 0.2g/L, liquid-gas ratio 10L/m3.The compressed gas consumption of the process mesohigh
32m3/ min is provided by concentrated nitric acid oxidation tower high pressure blower 28.
Through blowing away most of N2O4Concentrated nitric acid (N in the concentrated nitric acid afterwards2O4Content be reduced to less than 0.006%) discharge
To concentrated nitric acid circulating slot 29, then each layer concentrated nitric acid oxygen into concentrated nitric acid oxidation tower king-tower 23 is sent via concentrated nitric acid circulation line
Change tower spray head group 26 to be sprayed, concentrated nitric acid is sprayed on the main filler 27 of each layer concentrated nitric acid oxidation tower, meanwhile, level-one exhaust gas by
Concentrated nitric acid oxidation tower gas access is entered in concentrated nitric acid oxidation tower king-tower 23, after concentrated nitric acid oxidation tower air flow method component
Rise, then in concentrated nitric acid oxidation tower king-tower 23, what is sprayed eliminates N2O4Concentrated nitric acid and level-one exhaust gas counter current contacting, liquid
Gas compares 10L/m3, so as to which the NO in level-one exhaust gas is oxidized to NO2, generate two level exhaust gas, air speed 0.5m/s.
The concentrated nitric acid returned in the kerve of 21 bottom of concentrated nitric acid oxidation tower tower body is carried out certainly by concentrated nitric acid Concentration Testing
After dynamic fluid infusion, and sent through concentrated nitric acid circulator to 2 top of concentrated nitric acid oxidation tower, i.e. dense nitre in concentrated nitric acid oxidation tower king-tower 23
Acid oxidase tower jet head sets 24 are sprayed, and complete cycle.
Generated two level exhaust gas is gone after acid-mist-removing via 2 top concentrated nitric acid oxidation tower demister of concentrated nitric acid oxidation tower by dense
Nitric acid oxidation tower gas vent is discharged.
Step 3：Using eliminating N2O4Dust technology tentatively remove NO in two level exhaust gas2Three-level exhaust gas is generated with NO.
The step 3 carries out in dust technology absorption tower 3.Configuration quality percent concentration is 15%~30%, temperature is about
20 DEG C of dust technology is in the kerve of 31 bottom of dust technology absorption tower tower body, via dilute nitre under the action of dust technology circulator
After dust technology is first condensed dust technology feeding condenser 30 by sour circulation line, then send into the sub- tower 32 in dust technology absorption tower
Each sub- jet head sets 34 in layer dust technology absorption tower are sprayed, and dust technology is sprayed on the sub- filler 35 in each layer dust technology absorption tower, together
When to blast compressed gas into the sub- tower 32 in dust technology absorption tower using dust technology absorption tower high pressure blower 38 (as empty in compressed
Gas), compressed gas rises in the sub- tower 32 in dust technology absorption tower, so as to utilize the dilute of spray in the sub- tower 32 in dust technology absorption tower
Nitric acid and the N in dust technology is blown away with the compressed gas of its counter current contacting2O4, its content is made to be less than 0.2g/L, liquid-gas ratio 10L/
m3.The compressed gas consumption 32m of the process mesohigh3/ min is provided by dust technology absorption tower high pressure blower 38.
Through blowing away most of N2O4Dust technology (N in the dust technology afterwards2O4Content be reduced to less than 0.006%) discharge
Each layer dust technology into dust technology absorption tower king-tower 33 is sent to inhale to dust technology circulating slot 39, then via dust technology circulation line
Tower spray head group 36 is received to be sprayed, dust technology is sprayed on the main filler 37 in each layer dust technology absorption tower, meanwhile, two level exhaust gas by
3 gas access of dust technology absorption tower is entered in dust technology absorption tower king-tower 33, via dust technology absorption tower air flow method component
After rise, then in dust technology absorption tower king-tower 33, what is sprayed eliminates N2O4Dust technology and two level exhaust gas counter current contacting,
The preliminary a large amount of NO removed in two level exhaust gas2With a small amount of NO, three-level exhaust gas is generated, air speed is less than 0.5m/s, and absorptivity is more than
70%, liquid-gas ratio 10L/m3, dust technology internal circulating load 160m3/ h, sprinkle density 20m3/m2·h。
The dust technology returned in the kerve of 31 bottom of dust technology absorption tower tower body is carried out certainly by dust technology Concentration Testing
After dynamic fluid infusion, sent again to 3 top of dust technology absorption tower, i.e. dust technology absorption tower further through the condensed device 30 of concentrated nitric acid circulator
The sub- jet head sets 34 in dust technology absorption tower in king-tower 33 are sprayed, and complete cycle.
Generated three-level exhaust gas via the dust technology absorption tower demisting device at the top of dust technology absorption tower 3 go after acid-mist-removing by
The 3 gas vent discharge of dust technology absorption tower.
In above-mentioned steps 2 and step 3, due to the spray in the sub- tower 32 of concentrated nitric acid oxidation tower tower 22 and dust technology absorption tower
The nozzle of injection pressure-air is increased below device, the N in dense/dust technology can be blown away2O4, so as to promote the oxidizability of NO
And NOXAbsorptivity.
Step 4：The NO in three-level exhaust gas is further removed using sodium hydroxide solution2Level Four exhaust gas is generated with NO.
The step 4 carries out in sodium hydroxide absorption tower 4.Configuration quality percent concentration is 15%~30%, temperature about
It is 40 DEG C of sodium hydroxides in the kerve of 41 bottom of sodium hydroxide absorption tower tower body, under the action of sodium hydroxide circulator
After first heating sodium hydroxide solution by heater 45, then each layer sodium hydroxide absorption tower sent into sodium hydroxide absorption tower 4 is sprayed
Head group 42 is sprayed, and sodium hydroxide solution spray is absorbed in each layer sodium hydroxide on tower packing 43, with sodium hydroxide absorption tower
41 lower part of tower body enters and is come into full contact with via the three-level exhaust gas adverse current of sodium hydroxide absorption tower air flow method component, thus into one
Step removes a large amount of NO in three-level exhaust gas2With a small amount of NO, air speed 0.5m/s, liquid-gas ratio 10L/m3, absorptivity is more than 70%, hydrogen-oxygen
Change sodium internal circulating load 160m3/ h, sprinkle density 20m3/m2H generates level Four exhaust gas.
The sodium hydroxide solution returned in the kerve of 41 bottom of sodium hydroxide absorption tower tower body is examined by naoh concentration
After surveying and carrying out automatic liquid supply, sent again into sodium hydroxide absorption tower 4 further through the heated device 45 of sodium hydroxide circulator
Sodium hydroxide absorption tower jet head sets 42 are sprayed, and complete cycle.
Generated level Four exhaust gas is via 4 top sodium hydroxide absorption tower demisting device of sodium hydroxide absorption tower except after lixiviating mist
It is discharged by sodium hydroxide absorption tower gas vent.
In above-mentioned steps 3 and step 4, due to being provided with condenser 30, condensation temperature to about 20 before dust technology absorption tower 3
DEG C, heater 45 is provided with before sodium hydroxide absorption tower 4, heated solution is to about 40 DEG C, so as to improve NOXAbsorption effect
Rate.
Step 5：Using urea liquid by the NO in level Four exhaust gas2It is reduced to N2And generate Pyatyi exhaust gas.
The step 5 carries out in urea liquid absorption tower 5.Configuration pH value is 1~3, mass percent concentration be 8%~
12%th, the urea liquid that temperature is about 60 DEG C is recycled in the kerve of 51 bottom of urea liquid absorption tower tower body in urea liquid
Each layer urea liquid absorption tower jet head sets 52 into urea liquid absorption tower 5 is sent to spray urea liquid under the action of device
Leaching, urea liquid spray are absorbed on tower packing 53 in each layer urea liquid, are entered with 5 lower part of urea liquid absorption tower and via urine
The level Four exhaust gas adverse current of plain solution absorption tower air flow method component comes into full contact with, the NO from by level Four exhaust gas2It is reduced to N2, from
And remove remaining NO2, Pyatyi exhaust gas is generated, the NO after Reducing and absorption in Pyatyi exhaust gasXConcentration is down to 240mg/m3With
Under, reach discharge standard.During being somebody's turn to do, air speed 0.5m/s, the internal circulating load 160m of urea liquid3/ h, spray painting density 20m3/m2·
h。
Step 6：By Pyatyi exhaust gas after clear water washing dehydration, sent through air-introduced machine 6 to 7 qualified discharge of chimney.
By the nitrous oxides exhaust gas during this implementation treated iron oxide pigment second oxidation, concentration is down to
240mg/m3Hereinafter, removal rate is more than 90%, meet present GB 16297-1996 standards.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of ferric oxide red colorant second oxidation technology waste gas processing method, for handling the second oxidation of ferric oxide red colorant
Exhaust gas caused by technique, it is characterised in that：The ferric oxide red colorant second oxidation technology waste gas processing method includes following
Step：
Step 1：Level-one exhaust gas is generated using the steam in the cooling method removal exhaust gas that exchanges heat and iron oxide red particle；
Step 2：Using eliminating N2O4Concentrated nitric acid the NO in the level-one exhaust gas is oxidized to NO2And generate two level exhaust gas；
Step 3：Using eliminating N2O4Dust technology tentatively remove NO in the two level exhaust gas2Three-level exhaust gas is generated with NO；
Step 4：The NO in the three-level exhaust gas is further removed using sodium hydroxide solution2Level Four exhaust gas is generated with NO；
Step 5：Using urea liquid by the NO in the level Four exhaust gas2It is reduced to N2And Pyatyi exhaust gas is generated, the Pyatyi exhaust gas
Reach discharge standard.
2. ferric oxide red colorant second oxidation technology waste gas processing method according to claim 1, it is characterised in that：It is described
In step 1, heat exchange cooling is carried out to the exhaust gas using water cycle.
3. ferric oxide red colorant second oxidation technology waste gas processing method according to claim 1, it is characterised in that：It is described
In step 2, first spray concentrated nitric acid and the N in the concentrated nitric acid is blown away using the compressed gas with its counter current contacting2O4, then spray
Eliminate N2O4Concentrated nitric acid make it that the NO in the level-one exhaust gas are oxidized to NO with the level-one exhaust gas counter current contacting2And
Generate the two level exhaust gas.
4. ferric oxide red colorant second oxidation technology waste gas processing method according to claim 1, it is characterised in that：It is described
In step 3, first spray dust technology and the N in the dust technology is blown away using the compressed gas with its counter current contacting2O4, then spray
Eliminate N2O4Dust technology make it that the NO in the two level exhaust gas are oxidized to NO with the two level exhaust gas counter current contacting2And
Generate the three-level exhaust gas.
5. ferric oxide red colorant second oxidation technology waste gas processing method according to claim 4, it is characterised in that：It is first cold
It is sprayed again after coagulating the dust technology.
6. ferric oxide red colorant second oxidation technology waste gas processing method according to claim 1, it is characterised in that：It is described
In step 4, spraying the sodium hydroxide solution makes it be removed in the three-level exhaust gas with the three-level exhaust gas counter current contacting
NO2And NO, generate the level Four exhaust gas.
7. ferric oxide red colorant second oxidation technology waste gas processing method according to claim 6, it is characterised in that：First plus
The heat sodium hydroxide solution sprays again.
8. ferric oxide red colorant second oxidation technology waste gas processing method according to claim 1, it is characterised in that：It is described
In step 5, spraying the urea liquid makes it with the level Four exhaust gas counter current contacting and by the NO in the level Four exhaust gas2Reduction
For N2, generate the Pyatyi exhaust gas.
9. ferric oxide red colorant second oxidation technology waste gas processing method according to claim 1, it is characterised in that：It is described
Ferric oxide red colorant second oxidation technology waste gas processing method further includes step 6：By the Pyatyi exhaust gas through clear water washing dehydration
After discharge.
10. ferric oxide red colorant second oxidation technology waste gas processing method according to claim 21, it is characterised in that：Institute
The mass percent concentration for stating concentrated nitric acid is 44% ~ 47%；The mass percent concentration of the dust technology is 15% ~ 30%；The hydrogen
The mass percent concentration of sodium hydroxide solution is 15% ~ 30%；The mass percent concentration of the urea liquid is 8% ~ 12%, pH value
It is 1 ~ 3.
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Application publication date: 20180619 |