CN206950939U - A kind of waste gas cleaning system - Google Patents
A kind of waste gas cleaning system Download PDFInfo
- Publication number
- CN206950939U CN206950939U CN201720617161.4U CN201720617161U CN206950939U CN 206950939 U CN206950939 U CN 206950939U CN 201720617161 U CN201720617161 U CN 201720617161U CN 206950939 U CN206950939 U CN 206950939U
- Authority
- CN
- China
- Prior art keywords
- waste gas
- absorption tower
- gas absorption
- heat exchanger
- cleaning system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model discloses a kind of waste gas cleaning system, it is characterised in that including pickling tube, waste gas collection device and emission-control equipment；The waste gas collection device includes blower fan, four baffle plates and the aspiration channel being arranged on rear side of baffle plate, and the emission-control equipment includes alkali lye spray absorber, the first waste gas absorption tower and the second waste gas absorption tower, preheater, heat exchanger, urea pyrolysis device and SCR reactors；The preheater is connected with heat exchanger, and described heat exchanger one end is connected with exhaust chimney, and the other end is connected with urea pyrolysis device, and the urea pyrolysis device is connected with SCR reactors, and the SCR reactors are connected by heat exchanger with exhaust chimney.The utility model can significantly improve the clean-up effect of pickling waste gas, and denitration efficiency is more than 98%, except HF and sulfuric acid waste gas efficiency are more than 99%.
Description
Technical field
It the utility model is related to field of metal surface treatment, and in particular to a kind of waste gas cleaning system.
Background technology
Metal wire rod, such as carbon steel, stainless steel, be the various standard components of processing, machinery axial workpiece, cold drawn steel and
The main material of various metallic articles, in beautiful, day country's production steel, wire rod accounts for 8%-10%, and steel are in shaping and heat
In processing procedure, surface can produce oxide skin, and this kind of oxide skin compact structure is strong with matrix adhesive force, containing Fe, Cr, Ni, lack
C and Si is measured, there may be Mn, Ti, Mo and elements such as w, oxide structure is:Ferrous oxide (FeO), iron oxide (Fe2O3), four
Fe 3 O (Fe3O4), chromium oxide (Cr2O3), nickel oxide (NiO), silica (SiO2), picotite (Cr2O3FeO)
With nickel spinelle (NiFe2O3) etc..Stainless steel oxidation skin destroys the aesthetic property of steel surface, can accelerate metal surface again
Electrochemical corrosion, and its existing surface stress can accelerate the stress corrosion of steel surface.Therefore, the oxide skin of steel surface
It must be removed before following process clean.
Steel surface is processed using pickling mode at present, can be removed in hot rolling and annealing process in steel surface shape
Into oxide skin, facilitate follow-up machine-shaping, current pickling generally use sulfuric acid or nitric acid and hydrofluoric acid nitration mixture acid
Wash, the largely pickling waste gas containing HF, nitrogen oxides can be produced in acid cleaning process, it is existing that effective processing how is carried out to waste gas
In the huge problem that acid-washing stainless steel industry is faced.
In Patent No. CN104138710A patent of invention, disclose pickling exhaust treatment system and handle waste gas
Method, ensure waste gas effect, reduce labor intensity, cleaning solution can be added automatically, pass through the quantitative feed cleaning solution of measuring pump, ensure essence
Degree and stability；In patent No. CN104307331A patent of invention, disclose in acid-washing stainless steel sludge handling process
Waste gas purification tapping equipment, is sprayed by medicament, and the flue dust, sulfur dioxide and nitrogen oxides of the inside all can be passed through
Medicament is discharged again after fully reacting washing, and chemical fertilizer etc. can be produced after the sludge settling with caused by.Both to waste gas
Purification provides corresponding method, but clean-up effect is poor, and pickling gas sampling efficiency is low and purification cost is higher.
Utility model content
Under the basis of above-mentioned background, the utility model aims to provide a kind of metal wire rod pretreating device, and technique is simple,
Low cost, improve the collection efficiency of pickling waste gas and the purification efficiency of waste gas.
The purpose of this utility model is achieved through the following technical solutions：
A kind of waste gas cleaning system, including pickling tube, waste gas collection device and emission-control equipment；The pickling tube is deep
Degree is between 2.5 ~ 3m, and for the height of liquid level between 1.5 ~ 2m, the side of pickling tube four is provided with waste gas receipts in the pickling tube
Acquisition means；The waste gas collection device includes blower fan, four baffle plates and the aspiration channel being arranged on rear side of baffle plate, the baffle plate point
The side of pickling tube opening four is not arranged on, at least one horizontal bar seam is provided with the middle part of the baffle plate, and the aspiration channel stitches with bar
It is engaged, the emission-control equipment is connected with aspiration channel；The emission-control equipment includes alkali lye spray absorber, first
Waste gas absorption tower and the second waste gas absorption tower, preheater, heat exchanger, urea pyrolysis device and SCR reactors；The alkali lye spray
Drench in absorption tower using sodium hydroxide solution as waste gas absorption liquid, the alkali lye spray absorber it is interior including 3 spiral boards and
One demisting plate, the alkali lye spray absorber are connected with the first waste gas absorption tower；First waste gas absorption tower is with hydrogen-oxygen
Change sodium solution and hypo solution as discarded absorbing liquid, include in first waste gas absorption tower 3 spiral boards and
One blind plate, first waste gas absorption tower are connected with the second discarded absorption tower；Second waste gas absorption tower is with hydroxide
As discarded absorbing liquid, second waste gas absorption tower is interior to include 3 spiral boards and one for sodium solution and hypo solution
Individual demisting plate, second waste gas absorption tower are connected with preheater；The preheater is connected with heat exchanger, the heat exchanger
One end is connected with exhaust chimney, and the other end is connected with urea pyrolysis device, and the urea pyrolysis device is connected with SCR reactors
Connect, the SCR reactors are connected by heat exchanger with exhaust chimney.
Preferably, first waste gas absorption tower and the second waste gas absorption tower, which are arranged in pairs or groups, is provided with an absorbing liquid circulation
Pond and three absorbing liquid circulating pumps.
Preferably, the demisting plate upset 180 degree installation in second waste gas absorption tower.
Preferably, the absorbing liquid circulation pond length is 4 ~ 5m, and width is 4 ~ 6m, is highly 3 ~ 4m.
Preferably, catalyst is provided with the SCR reactors, the catalyst includes cordierite honeycomb ceramic matrix
And it is arranged on the metal salt in cordierite honeycomb ceramic matrix.
The beneficial effects of the utility model are as follows：
1st, waste gas cleaning system provided by the utility model, purified treatment is collected to pickling waste gas, using in alkali cleaning
With, absorb reduction and SCR methods are handled waste gas, waste gas purification that can be with high-efficient purification based on HF, nitrogen dioxide,
To HF purifying rates up to 99%.
2nd, waste gas cleaning system provided by the utility model, design again has been carried out to waste gas collection device, by pickling
Pond is deepened, and so ensures that wire rod is left after liquid level also in pickling tube, preventing that waste gas is excessive, while existing top surface is taken out
The mode of wind is revised as four sides exhausting, and the height of inlet scoop coordinates aspiration channel, the waste gas in pickling tube is collected, waste gas
Effect is collected more than 90%.
3rd, waste gas cleaning system provided by the utility model, using alkali lye spray absorber to the sulfuric acid in sulfuric acid washing pond
Mist carries out neutralization absorption, and HF and nitrogen dioxide are carried out using the first absorption tower and second absorption tower to neutralize reduction cleaning,
Neutralization reaction is carried out using alkali lye and nitrous oxides exhaust gas, while the spy of reducing agent is used as in alkali lye by the use of sodium thiosulfate
Property, nitrogen dioxide is reduced to nitrogen, so as to improve purification efficiency, in the first purifying column and the second purifying column, by meter
Calculate, the spiral board and corresponding blind plate or demisting plate, two towers for setting fixed number are purified step by step, greatly improve waste gas
Clean-up effect.
4th, waste gas cleaning system provided by the utility model, after absorbing reducing process, collocation SCR processing waste gas can
To realize waste gas purification rate up to more than 98%, denitration efficiency is higher than 98%, and nitrous oxides concentration is less than 100mg/m3。
Brief description of the drawings
Fig. 1 is system schematic of the present utility model；
Fig. 2 is the schematic diagram of alkali lye spray absorber in the utility model；
Fig. 3 is the schematic diagram on the first absorption tower in the utility model；
Fig. 4 is the schematic diagram of second absorption tower in the utility model；
Fig. 5 is the schematic diagram of waste gas collection device in the utility model.
Embodiment
The utility model is described in further detail with reference to accompanying drawing and embodiment.This specific embodiment is only to this
The explanation of utility model, it is not the limitation to utility model, and those skilled in the art can be with after this specification is read
Any modification is made to the present embodiment as needed, but as long as all by Patent Law in right of the present utility model
Protection.
A kind of waste gas cleaning system, including pickling tube, waste gas collection device and emission-control equipment；
The pickling tank depth is between 2.5 ~ 3m, and the height of liquid level is between 1.5 ~ 2m in the pickling tube, the acid
The side of wash pool four is provided with waste gas collection device, and pickling tube is deepened, and so ensures that wire rod leaves liquid level afterwards also in pickling tube
In, prevent that waste gas is excessive；
The waste gas collection device includes blower fan, four baffle plates and the aspiration channel being arranged on rear side of baffle plate, the baffle plate
The side of pickling tube opening four is separately positioned on, at least one horizontal bar seam, the aspiration channel and bar are provided with the middle part of the baffle plate
Seam is engaged, and the emission-control equipment is connected with aspiration channel, and the mode of existing top surface exhausting is revised as into four sides exhausting,
Air draught efficiency is improved with this, reduces the loss of waste gas, the height of inlet scoop coordinates aspiration channel, the waste gas in pickling tube entered
Row is collected；
The emission-control equipment include alkali lye spray absorber, the first waste gas absorption tower and the second waste gas absorption tower,
Preheater, heat exchanger, urea pyrolysis device and SCR reactors；In the alkali lye spray absorber using sodium hydroxide solution as
Waste gas absorption liquid, the alkali lye spray absorber is interior to include 3 spiral boards and a demisting plate, the alkali lye spray absorber
It is connected with the first waste gas absorption tower；First waste gas absorption tower is using sodium hydroxide solution and hypo solution as useless
Abandon absorbing liquid, include 3 spiral boards and a blind plate in first waste gas absorption tower, first waste gas absorption tower and the
Two discarded absorption towers are connected；Second waste gas absorption tower is inhaled using sodium hydroxide solution and hypo solution as discarded
Liquid is received, includes 3 spiral boards and a demisting plate in second waste gas absorption tower, removing in second waste gas absorption tower
The upset 180 degree installation of mist plate, improves effect, second waste gas absorption tower is connected with preheater, utilizes alkali lye spray-absorption
Tower carries out neutralization absorption to the sulfuric acid mist in sulfuric acid washing pond, using the first absorption tower and second absorption tower to HF and dioxy
Change nitrogen to carry out neutralizing reduction cleaning, carry out neutralization reaction using alkali lye and nitrous oxides exhaust gas, while exist using sodium thiosulfate
Characteristic in alkali lye as reducing agent, nitrogen dioxide is reduced to nitrogen, so as to improve purification efficiency.
The preheater is connected with heat exchanger, and described heat exchanger one end is connected with exhaust chimney, the other end and urea
Pyrolysis apparatus is connected, and the urea pyrolysis device is connected with SCR reactors, and the SCR reactors pass through heat exchanger and exhaust
Chimney is connected.
Meanwhile first waste gas absorption tower and the second waste gas absorption tower are arranged in pairs or groups and are provided with an absorbing liquid circulatory pool
And three absorbing liquid circulating pumps.
Demisting plate upset 180 degree installation in second waste gas absorption tower.
The absorbing liquid circulation pond length is 4m, width 4m, is highly 4m.
Catalyst is provided with the SCR reactors, the catalyst includes cordierite honeycomb ceramic matrix and setting
Metal salt in cordierite honeycomb ceramic matrix.
Corresponding to above-mentioned pretreating device, application method of the present utility model comprises the following steps:
S1:When wire rod is immersed in pickling tube, blower fan is opened, waste gas is absorbed by exhaust gas absorption device, works as acid
Wash into afterwards, wire rod is proposed and is located in pickling tube from the pickle of pickling tube, is held using exhaust gas absorption device
It is continuous to carry out waste gas absorption, and the waste gas of absorption is delivered to alkali lye spray absorber；
S2：If the pickle in S1 in pickling tube is sulfuric acid, waste gas after alkali lye spray absorber by directly discharging
To air；If the pickle in S1 in pickling tube is nitric acid or nitration mixture, waste gas after alkali lye spray absorber by entering
In first absorption tower；
S3：Waste gas enters the first absorption tower, sodium hydroxide and hypo solution from top spray and under, by hydrofluoric acid
Neutralized, while nitrogen dioxide reduction is turned into nitrogen, it is molten with sodium thiosulfate to sodium hydroxide using absorbing liquid circulatory pool
Liquid carries out recovery and spray repeatedly, and spray time is in 45min, spray flux 50m3/h；
S4：Waste gas is by entering second absorption tower after the first absorption tower, and sodium hydroxide and hypo solution are from upper
Portion spray and under, hydrofluoric acid is neutralized, at the same by nitrogen dioxide reduction turn into nitrogen, using absorbing liquid circulatory pool to hydrogen-oxygen
Change sodium and carry out recovery repeatedly and spray with hypo solution, spray time is in 30min, spray flux 30m3/h；
S5：Waste gas after being filtered by absorption tower, which is sent into front preheating process device, to be preheated, and is subsequently entered gas gas and is changed
Heat exchange heating is carried out in hot device, the waste gas after heating is heated to reaction temperature by fuel burner nozzle again, and urea sprays into urea injection
In blender, urea carried out by urea pyrolysis device to be decomposed to form reducing agent, it is anti-subsequently into SCR is carried out in SCR reactors
Should, reacted tail gas enters heat release in gas-gas heat exchanger, is then emitted into air by exhaust chimney.
Using the waste gas cleaning system, gas sampling efficiency can be improved to 90%, design sulfuric acid washing waste gas passes through after collection
Discharged after the processing of one-level alkali liquor absorption, alkali lye spray absorber is pulled using 3 pieces of spiral boards and 1 piece of demisting；Nitration mixture pickling and nitre
Pickling waste gas discharges after collecting after collection into two sodium hydroxides and the purification of sodium thiosulfate absorbing liquid, absorption tower Zong Ta
Plate number, which is that 6 pieces of 1 piece of spiral board+bottoms are blind, to be pulled+1 piece of demisting and pulls, and realizes that denitration efficiency is higher than 98%, net to HF and sulfuric acid waste gas
Change efficiency more than 99%.
Claims (5)
1. a kind of waste gas cleaning system, it is characterised in that including pickling tube, waste gas collection device and emission-control equipment；
The pickling tank depth is between 2.5 ~ 3m, and the height of liquid level is between 1.5 ~ 2m in the pickling tube, the pickling tube
Four sides are provided with waste gas collection device；
The waste gas collection device includes blower fan, four baffle plates and the aspiration channel being arranged on rear side of baffle plate, the baffle plate difference
The side of pickling tube opening four is arranged on, at least one horizontal bar seam is provided with the middle part of the baffle plate, the aspiration channel stitches phase with bar
Coordinate, the emission-control equipment is connected with aspiration channel；
The emission-control equipment includes alkali lye spray absorber, the first waste gas absorption tower and the second waste gas absorption tower, preheating
Device, heat exchanger, urea pyrolysis device and SCR reactors；
Using sodium hydroxide solution as waste gas absorption liquid in the alkali lye spray absorber, include in the alkali lye spray absorber
3 spiral boards and a demisting plate, the alkali lye spray absorber are connected with the first waste gas absorption tower；
First waste gas absorption tower is useless using sodium hydroxide solution and hypo solution as discarded absorbing liquid, described first
Include 3 spiral boards and a blind plate in aspiration tower, first waste gas absorption tower is connected with the second discarded absorption tower；
Second waste gas absorption tower is useless using sodium hydroxide solution and hypo solution as discarded absorbing liquid, described second
Include 3 spiral boards and a demisting plate in aspiration tower, second waste gas absorption tower is connected with preheater；
The preheater is connected with heat exchanger, and described heat exchanger one end is connected with exhaust chimney, the other end and urea pyrolysis
Device is connected, and the urea pyrolysis device is connected with SCR reactors, and the SCR reactors pass through heat exchanger and exhaust chimney
It is connected.
2. waste gas cleaning system according to claim 1, it is characterised in that first waste gas absorption tower and the second waste gas
Absorption tower, which is arranged in pairs or groups, is provided with an absorbing liquid circulatory pool and three absorbing liquid circulating pumps.
3. waste gas cleaning system according to claim 1, it is characterised in that the demisting plate in second waste gas absorption tower turns over
Turnback is installed.
4. waste gas cleaning system according to claim 2, it is characterised in that the absorbing liquid circulation pond length is 4 ~ 5m, wide
Spend for 4 ~ 6m, be highly 3 ~ 4m.
5. waste gas cleaning system according to claim 1, it is characterised in that catalyst is provided with the SCR reactors,
The catalyst includes cordierite honeycomb ceramic matrix and the metal salt being arranged in cordierite honeycomb ceramic matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720617161.4U CN206950939U (en) | 2017-05-31 | 2017-05-31 | A kind of waste gas cleaning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720617161.4U CN206950939U (en) | 2017-05-31 | 2017-05-31 | A kind of waste gas cleaning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206950939U true CN206950939U (en) | 2018-02-02 |
Family
ID=61378492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720617161.4U Expired - Fee Related CN206950939U (en) | 2017-05-31 | 2017-05-31 | A kind of waste gas cleaning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206950939U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107158901A (en) * | 2017-05-31 | 2017-09-15 | 海盐建盛五金制品有限公司 | A kind of waste gas cleaning system and its method |
-
2017
- 2017-05-31 CN CN201720617161.4U patent/CN206950939U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107158901A (en) * | 2017-05-31 | 2017-09-15 | 海盐建盛五金制品有限公司 | A kind of waste gas cleaning system and its method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207713438U (en) | A kind of system improving stainless steel acid-washing waste liquid nitric acid regeneration yield | |
| CN105908195B (en) | A kind of hot rolling 409L ferritic stainless steels are without nitric acid acidwashing method | |
| CN107601605B (en) | Technology and system for improving yield of regenerated nitric acid from stainless steel pickling waste liquid | |
| CN105862053B (en) | Hydrochloric acid exhausted liquid reclaiming process and system | |
| CN105887108B (en) | Hydrochloric acid exhausted liquid reclaiming process and system | |
| CN105536467B (en) | The smoke eliminator and method that a kind of photochemical catalytic oxidation combination Two-way Cycle absorbs | |
| CN105195005B (en) | Coking flue gas and ammonia-containing water integrated treatment economic benefits and social benefits cleaning system | |
| CN106435607B (en) | Environment-friendly continuous annealing and pickling production method for stainless steel hot-rolled coil and pickling solution | |
| CN106011886A (en) | Nitric acid-free pickling method for hot-rolled 201 austenitic stainless steel | |
| CN206950939U (en) | A kind of waste gas cleaning system | |
| CN107158901A (en) | A kind of waste gas cleaning system and its method | |
| CN111663044B (en) | Acidic sludge and waste acid recycling device and process | |
| CN210528729U (en) | Stainless steel acid-mixed waste liquid sludge harmless treatment system | |
| CN105776385B (en) | Stainless steel spent solution regeneration system and its control method based on spray roasting | |
| CN111960392B (en) | Mixed acid waste liquid resource recovery system and process | |
| CN105413410A (en) | Device for recycling and purifying acid mist of pickling line | |
| CN105671572A (en) | Steel pickling solution recycling device and process based on Fenton oxidization | |
| CN109467149B (en) | Acid waste liquid recovery device and waste acid recovery process | |
| CN208493801U (en) | A kind of desulfurization and dedusting disappears white device for deep cleaning | |
| CN107574450A (en) | A kind of stainless steel acid-washing waste liquid renovation process and system | |
| CN205288031U (en) | Clarification plant is retrieved to pickling line acid mist | |
| CN210964335U (en) | Comprehensive synergistic treatment system for calcination tail gas of titanium dioxide rotary kiln | |
| CN109467065A (en) | A kind of stainless steel mixed acid waste liquor regenerated acid equipment | |
| CN106215646B (en) | Spent solution regeneration system, cooling system and its regenerated acid production method and cooling means | |
| CN207537534U (en) | A kind of stainless steel acid-washing waste liquid regenerative system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180202 Termination date: 20210531 |