CN102527223A - Sintering machine flue gas desulfurization process and device thereof - Google Patents
Sintering machine flue gas desulfurization process and device thereof Download PDFInfo
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- CN102527223A CN102527223A CN2011104426885A CN201110442688A CN102527223A CN 102527223 A CN102527223 A CN 102527223A CN 2011104426885 A CN2011104426885 A CN 2011104426885A CN 201110442688 A CN201110442688 A CN 201110442688A CN 102527223 A CN102527223 A CN 102527223A
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Abstract
The invention discloses a sintering machine flue gas desulfurization process and a device thereof, and belongs to the technical field of air pollution control. The device comprises a slurry tank, an absorption tower, an inlet flue channel and an outlet flue channel. A flue gas washing tank is arranged below the inlet flue channel, wherein the flue gas washing tank is communicated with the inlet flue channel. A spraying device is arranged inside the inlet flue channel above the flue gas washing tank, and is communicated with the bottom of the flue gas washing tank through a circulating pump. The process comprises that: before the sintering machine flue gas enters the absorption tower, more than 95% of dust and all acid gases in the sintering machine flue gas are removed through a washing liquid when the sintering machine flue gas flows through the inlet flue channel above the flue gas washing tank, and then the treated sintering machine flue gas enters an absorption tower to carry out desulfurization. The device and the process of the present invention are used for pretreatment of the sintering machine flue gas before the desulfurization to remove the dust and the acid gas in the flue gas so as to improve the desulfurization efficiency and the oxidation rate of the flue gas in the absorption tower, reduce the investment cost and the operation cost of the sintering machine flue gas desulfurization, improve the purity of the desulphurization byproduct gypsum, and achieve the economic benefits of the flue gas desulfurization.
Description
Technical field
The present invention relates to the air pollution control technique field, be specifically related to a kind of flue gas of sintering machine technology and device.
Background technology
By the end of the year 2008,8012 of China Steel enterprise sums are distributed in the whole nation 31 provinces, municipality directly under the Central Government or autonomous regions; The steel and iron industry gross output value was 44727.96 hundred million yuan in 2008, increased by 32.71% than 2007, and the ratio that accounts for national industrial gross annual output value is 9.1%.Iron and Steel Production mainly comprises links such as sintering, pelletizing, coking, ironmaking, steel-making, steel rolling, forging and pressing, ferroalloy, refractory material, power; Steel plant have the various stoves of discharging volume of smoke and waste gas, as not controlling one of heavy polluter that then belongs in the industrial department.
Steel industry sulfur dioxide is mainly produced by the agglomerates of sintered pellets flue gas, accounts for iron and steel enterprise's total emission volumn more than 70%, and indivedual enterprises reach about 90% and (do not contain the sulfur dioxide that coal-fired power plant for self-supply produces).China's steel industry sinter fume complicated component, fluctuation is bigger, brings great difficulty to improvement.At first, exhaust gas volumn is big, and sulfur dioxide concentration, flow and variations in temperature are big, and it is 4000～6000m that one ton of sintering deposit produces flue gas
3, sulfur dioxide concentration is at 500～5000mg/Nm
3Between change, temperature then changes between 80～180 ℃, the amplitude of variation of flow is up to more than 40%.Secondly, moisture is big and unstable, is generally 10～13%; Oxygen content is high, is generally 15～18%; Also contain multiple pollutant component in the flue gas, except that containing sulfur dioxide, dust, also contain heavy metal, dioxin, nitrogen oxide, HCl, HF, H
2S etc.These characteristics of sintering machine have all increased the difficulty that the steel sintering SO 2 from fume is administered to a certain extent.
The sulfur method of flue gas mainly can be divided into three kinds of dry method, semidry method and wet methods, because the special nature of sintering device flue gas, these three kinds of methods all can not well be applied in the flue gas of sintering machine project at present.Wet fuel gas desulfurizing technology be with calcium-based desulfurizing agents such as lime stone, lime behind the desulfurization slurry that is made into the 10%-20% concentration range, the spraying layer that desulfurization slurry is admitted to the absorption tower washs, absorbs sulfur in smoke, realizes the purpose of flue.The pH value of wet desulphurization slurries generally is controlled at 5-7; Sulfur dioxide is washed back entering slurries and in slurries, mainly exists with the form of inferior sulfate radical and bisulfite; System sends into oxidation wind in the absorption tower through oxidative system; With calcium sulfite oxidation is calcium sulphate dihydrate, and calcium sulphate dihydrate is realized precipitated crystal in the absorption tower.Wet fuel gas desulfurizing technology has characteristics such as SR is little, desulfuration efficiency is high, desulfurizing byproduct can be realized recycling and has therefore obtained large-scale popularization; Therefore wet desulfurizing process most possibly adapts to flue gas of sintering machine through changing processing route, realizes energy-saving and emission-reduction.。
Dust generally contains Fe in the sintering device flue gas
2O
3, SiO
2, Al
2O
3, MnO, FeO, P
2O
3Get in the wet desulfurization system with flue gas in, these dust, with sulfur in smoke together with spray washing liquid absorbing contacting, sulfur dioxide is absorbed by drop and generates inferior sulfate radical and bisulfite; P in the dust
2O
3Dissolve in water rapidly and generate metaphosphoric acid; Increased the acidifying speed of cleaning solution droplet; And the entering meeting of MnO under the condition of aerobic, the inferior sulfate radical in the drop to be carried out catalytic oxidation be sulfate radical; Bisulfite is converted into sulfate radical and hydrogen ion, has further increased the acidifying speed of cleaning solution droplet; In spray liquid decline process, because the entering of sintering machine dust causes the pH of spray washing liquid can quicken to descend, the pH value generally reduces by 0.5 to 0.8 than normal operation, will reduce the ability of cleaning solution absorbing sulfur dioxide greatly, has reduced desulfuration efficiency; The content of Fe is up to more than 50% in the sintering device flue gas dust, and the Fe element in the desulphurization system is finally taken out of with desulfurization product-desulfurated plaster, causes Fe too high levels in the gypsum, greatly reduces the value of desulfurated plaster.In addition, the sintering device flue gas dust also has very big viscosity, and these dust can increase the viscosity of slurries greatly in getting into slurries; As easy as rolling off a log at the thicker bubble level of slurry surface formation; Also reduce simultaneously the mass transfer rate of the inner gas-liquid contacts of slurries, increased the energy consumption of desulphurization system, the waste resource.
HCl, HF, H in the sintering device flue gas
2The content of S exceeds fire coal boiler fume far away, and the content of HCl is at 40-70mg/Nm in the sintering device flue gas
3, the content 20-30mg/Nm of HF
3, all exceed more than three times than fire coal boiler fume; The HCl of high concentration and HF gas can the quickening Cl of system after getting into wet desulfurization system
-And F
-Enrichment, Cl in slurries
-And F
-Ion is understood the inner hardware of rapid etching system after reaching finite concentration; While F
-Ion and Al
3+Ion forms calcirm-fluoride and aluminum hydroxide precipitation easily in slurries, calcium carbonate is wrapped up, and it is inaccessible to form calcium carbonate, stops the stripping of calcium carbonate, finally causes whole wet desulfurization system paralysis; H in the sintering device flue gas
2S is the stronger reducing agent of a kind of activity, in slurries, can have precedence over calcium sulfite and oxygen catalytic oxidation, but H
2The oxidation rate of S has only 2-4mmol/Lh, has seriously hindered the oxidation of calcium sulfite.Calcium sulfite is a kind of solid pollutant, does not have value, so H in the flue gas
2The existence of S has also influenced the application of wet desulfurizing process in sintering device flue gas largely.
So because these particularity of sintering device flue gas, it is impracticable directly traditional lime stone-gypsum wet sulfur removal technology being applied to flue gas of sintering machine.
Application number is the sintering device flue gas pretreatment unit that 201120025562.3 utility model discloses a kind of horizontal arrangement, is made up of casing, gas-liquid disturbance spray equipment and demister device.This patent is not controlled the flue gas water yield and pH, if the pH of shower water is higher, then can directly absorb sulfur in smoke, can't realize that desulfurization and flue gas are pretreated to separate; The bottom of device slurry tank does not have mixing plant, the dust meeting occluding device that from flue gas, washs; In addition, this utility model is that inlet flue gas is introduced in the pretreatment unit, and equipment itself and disturbance nozzle have increased the resistance of flue gas greatly.
Summary of the invention
The invention provides a kind of flue gas of sintering machine technology and device; Sintering device flue gas is washed away at the gas approach wash-in and is got into the absorption tower again after getting rid of dust and sour gas and carry out wet desulphurization; Improved desulfuration efficiency and the oxidation rate of flue gas in the absorption tower; Reduce the cost of investment and the operating cost of flue gas of sintering machine, improved the purity of desulfurizing byproduct gypsum simultaneously, realized the economic benefit of flue gas desulfurization.
A kind of flue gas of sintering machine device; Comprise slurries filling, absorption tower, gas approach and exhaust pass; Described gas approach below is provided with the flue gas washing jar that is communicated with it; Be provided with spray thrower in the gas approach of described flue gas washing jar top, described spray thrower is communicated with the bottom of flue gas washing jar through circulating pump.
Described flue gas washing jar is irritated with slurries and is communicated with.Adopt the slurries in the serum pot to carry out circulation cleaning, saved the pretreated water consumption of flue gas, reduced the cost of wastewater treatment.
The bottom of described flue gas washing jar is provided with agitator, stirs the slurries in the flue gas washing jar, makes the dust that washs in the flue gas can occluding device.
Described flue gas washing jar inwall is provided with lining and moulds liner, and thickness is 2-5mm.Adopt lining to mould liner, can prevent or slow down Cl
-And F
-Deng corrosion to flue gas washing jar inwall.
Be provided with demist layer, spraying layer and desulfurizing agent stock tank in the described absorption tower from top to bottom successively.
The present invention also provides a kind of technology of utilizing described flue gas of sintering machine device sintering device flue gas to be carried out desulfurization; Comprise: sintering device flue gas is fed the absorption tower through gas approach carry out wet desulphurization; Described spray thrower extracts the flue gas washing pot bottom through circulating pump cleaning solution sprays processing to the sintering device flue gas through it, and the cleaning solution behind the spray is back in the washing tank; Said cleaning solution is lime stone slurry or lime slurry.
The pH value of described cleaning solution maintains 2.5-3.8.In this pH value scope, the HCl in the sintering device flue gas, HF, H
2Sour gas such as S all absorb, and sulfur dioxide can not be absorbed, and sintering device flue gas gets into after the washing tank preliminary treatment in the absorption tower, and the sulfur dioxide that washing removes in the absorption tower produces the accessory substance gypsum.
Also be added with antifoaming agent in the described cleaning solution, the consumption of said antifoaming agent is 5-10g/m
3D.Antifoaming agent can well prevent the inner foaming of slurries, prevents that bubble from producing cavitation to pump, has guaranteed the normal operation of desulphurization plant.
Liquid-gas ratio when described spray is handled is 2-5L/m
3In this liquid-gas ratio scope, harmful dust in the sintering device flue gas and sour gas can both obtain good treatment, and the preliminary treatment energy consumption of sintering device flue gas is lower.
The pH value of said absorption tower internal reaction system is 5.0-5.8, and the design time of staying in the absorption tower is 6-10h, and the particle diameter of desulfurizing byproduct gypsum is at 50-80um.
Beneficial effect of the present invention:
(1) washing tank is arranged on the gas approach below; Spray thrower is set in the gas approach; Directly in gas approach, remove dust in flue gas and highly acid gas through wash spray technology; Greatly reduce the pretreated cost of investment of flue gas, and prevent that flue gas pressure drop in preprocessing process is too high, saved the energy consumption of system; Adopt the slurries in the serum pot to carry out circulation cleaning, saved the pretreated water consumption of flue gas, reduced the cost of wastewater treatment;
(2) owing to do not have HCL, HF, H
2The interference of sour gas such as S; The absorption efficiency of sintering device flue gas in desulfurizing tower through washing is far longer than the not sintering device flue gas through washing; Under the situation that satisfies identical desulfuration efficiency; Required liquid-gas ratio significantly reduces, and has reduced the cost of investment and the operating cost of flue gas of sintering machine system;
(3) preliminary treatment is removed acidic gas in flue gas and can be avoided or slow down the corrosion to the absorption tower, prolongs benefiting from the life-span of absorption tower;
(4) 95% dust is washed together in company with sour gas and gets into the flue gas washing jar in the sintering device flue gas, has eliminated because dust causes the reduction of desulfurization slurry pH value in the sweetening process, has improved desulfuration efficiency, has reduced washing SO
2The energy consumption that needs has realized the economic benefit of desulfurization;
(5) improved the purity of desulfurizing byproduct gypsum, the gypsum moisture content is lower than 10%, and the content of calcium carbonate is lower than 0.03% in the gypsum, and the content of Fe is less than 0.02%.
Description of drawings
Fig. 1 is a structural representation of the present invention
The specific embodiment
As shown in Figure 1, wherein 18-gas approach 19-exhaust pass 20-spray thrower is flowed on 1-sintering device flue gas 2-flue gas washing jar 3-circulating pump 4-absorption tower 5-desulfuration recycle pump 6-serum pot 7-slurry supply pump 8-desulfurizing agent pulp-inlet pipe 9-cleaning solution pulp-inlet pipe 10-gypsum slurries excavationg pump 11-cleaning solution excavationg pump 12-cleaning solution cyclone 13-cleaning solution top stream 14-cleaning solution underflow 15-gypsum cyclone 16-gypsum cyclone underflow 17-gypsum cyclone top.
A kind of flue gas of sintering machine device; Spray column is selected on absorption tower 4 for use; Be provided with two-layer demist layer, three layers of spraying layer, smoke absorption district and desulfurizing agent stock tank in the absorption tower 4 from top to bottom successively; Absorption tower 4 is provided with 3 desulfuration recycle pumps 5, and the arrival end of desulfuration recycle pump 5 is communicated with the desulfurizing agent stock tank on absorption tower 4, the port of export is communicated with each layer spraying layer, and exhaust pass 19 is communicated with the top on absorption tower 4; Absorption tower 4 is communicated with near the arrival end of at gypsum slurries excavationg pump 10, and the port of export of gypsum slurries excavationg pump 10 is communicated with gypsum cyclone 15;
The demist number of layers is two-layer, is made up of at the plastic plate of 0.5 centimetre of left and right sides PP material a series of thickness, and each plastic plate becomes rugosity; The folded sheet spacing of lower floor is bigger than normal, and spacing is about 4 centimetres, and the folded sheet spacing on upper strata is less; About 2 centimetres, the demist layer is provided with folding flue; Spraying layer quantity is three layers, all is made up of several nozzles on pipeline and the pipeline for every layer;
Slurries are irritated 6 and are communicated with the arrival end of slurry supply pump 7; The port of export of slurry supply pump 7 is divided into desulfurizing agent pulp-inlet pipe 8 and 9 two of cleaning solution pulp-inlet pipes; Desulfurizing agent pulp-inlet pipe 8 is communicated with desulfurizing agent stock inlet on the 4 tower walls of absorption tower, and cleaning solution pulp-inlet pipe 9 is communicated with cleaning solution stock inlet on the flue gas washing jar 2;
Technological process of the present invention is following:
Sintering device flue gas 1 is getting into absorption tower 4 under the booster fan effect above gas approach 18 process washing tanks 2; Flue gas is through above the washing tank 2 during flue; Cleaning solution is squeezed into dust and the sour gas that spray thrower 20 is removed in the sintering device flue gas 1 through circulating pump 3 in the flue gas washing jar 2; The time of staying of the design spray washing section of sintering device flue gas 1 in gas approach 18 got into then and carries out flue gas desulfurization in the absorption tower 4 in 1-2 second;
Cleaning solution (lime stone slurry) is sent in the washing tank 6; By circulating pump 3 cleaning solution is evacuated to the sintering device flue gas 1 of spray thrower 20 spray washings through him; After cleaning solution absorbs the highly acid gas in the sintering device flue gas 1; PH drops in the scope of 2.5-3.8; Send into lime stone slurry by washing tank pulp-inlet pipe 9 to washing tank 6 in the spray washing process, the pH value of cleaning solution and maintaining in the 2.5-3.8 scope in the balance washing tank 6 can absorb HCl whole in the sintering device flue gas 1, HF, H in this pH value scope
2Sour gas such as S, the liquid-gas ratio of control spray thrower 20 is at 2-5L/m
3In the scope, can the removal efficient of dust in the sintering device flue gas 1 be reached more than 95%; Send in the absorption tower 4 through desulfurizing agent pulp-inlet pipe 8; The pH value of lime stone slurry is controlled at 5.2-5.5 in the absorption tower 4; Sintering device flue gas absorption tower 4 in reverse contact of lime stone slurry after desulfuration recycle pump 5 is sent into spraying layer and washed through cleaning solution in the absorption tower 4, sulfur dioxide is absorbed to generate calcium sulfite in this process, under the effect of air blast, generate gypsum crystal and deposition; Design lime stone slurry time of staying in absorption tower 4 is 8 hours; Gypsum slurries in the absorption tower 4 is sent into gypsum cyclone 15 by gypsum slurries excavationg pump 10, and gypsum cyclone underflow 16 gets into the band filter and carries out gypsum dehydration, and gypsum cyclone top stream 17 gets into reservoir; Antifoaming agent gets into flue gas washing jar 2 at washing tank stock inlet place with cleaning solution, and the addition of antifoaming agent is 5-10g/m
3D.When cleaning solution density reached 1.2 in the flue gas washing jar 2, cleaning solution was sent in the cleaning solution cyclone 12 through cleaning solution excavationg pump 11 in the flue gas washing jar 2, and cleaning solution top stream 13 gets into waste water processing station, and slurries are admitted to and are with filter to slag tap in the cleaning solution underflow 14.
In following examples in gypsum purity, the gypsum detection of calcium carbonate residual volume and Fe content all adopt GBT5484-2000.
Certain 2 * 180m of iron and steel group
2Sintering device flue gas adopts wet method desulfurization method of limestone-gypsum technology, and the pH value of cleaning solution is controlled at 2.5-2.8 in the flue gas washing jar, and flue gas is 2 seconds in the spray washing section time of staying, and the liquid-gas ratio of flue gas spray washing is 3L/m
3, the absorption tower slurry pH value is controlled at 5.2-5.5, and the consumption of antifoaming agent is 5g/m in the flue gas washing jar
3D, inlet SO
2Concentration is 3700mg/m3, outlet SO
2Concentration is 81mg/m
3, the absorption tower liquid-gas ratio is 8L/m
3Gypsum purity is greater than 97%, and the calcium carbonate residual volume is less than 0.01% in the gypsum, and Fe content is less than 0.02%.
Certain 2 * 120m of iron and steel group
2Sintering device flue gas adopts wet method desulfurization method of limestone-gypsum technology, and the pH value of cleaning solution is controlled at 2.5-3.0 in the flue gas washing jar, and flue gas is 1.8 seconds in the spray washing section time of staying, and the liquid-gas ratio of flue gas spray washing is 5L/m
3, the absorption tower slurry pH value is controlled at 5.2-5.6, and the consumption of antifoaming agent is 8g/m in the flue gas washing jar
3D, inlet SO
2Concentration is 4600mg/m
3, outlet SO
2Concentration is 113mg/m
3, the absorption tower liquid-gas ratio is 10L/m
3Gypsum purity is big by 96%, and the calcium carbonate residual volume is less than 0.02% in the gypsum, and Fe content is less than 0.03%.
Embodiment 3
Certain 2 * 320m of iron and steel group
2Sintering device flue gas adopts wet method desulfurization method of limestone-gypsum technology, and the pH value of cleaning solution is controlled at 2.5-2.7 in the washing tank, and flue gas is 1.7 seconds in the spray washing section time of staying, and the flue gas washing liquid-gas ratio is 5L/m
3, the absorption tower slurry pH value is controlled at 5.2-5.5, and the consumption of antifoaming agent A is 10g/m in the washing tank
3D, inlet SO
2Concentration is 3900mg/m
3, outlet SO
2Concentration is 96mg/m
3, the absorption tower liquid-gas ratio is 7L/m
3Gypsum purity is greater than 96%, and the calcium carbonate residual volume is less than 0.01% in the gypsum, and Fe content is less than 0.02%.
Claims (9)
1. flue gas of sintering machine device; Comprise slurries filling (6), absorption tower (4), gas approach (18) and exhaust pass (19); It is characterized in that; Described gas approach (18) below is provided with the flue gas washing jar (2) that is communicated with it, is provided with spray thrower (20) in the gas approach (18) of described flue gas washing jar (2) top, and described spray thrower (20) is communicated with the bottom of flue gas washing jar (2) through circulating pump (3).
2. flue gas of sintering machine device according to claim 1 is characterized in that, described flue gas washing jar (2) is irritated (6) with slurries and is communicated with.
3. flue gas of sintering machine device according to claim 1 is characterized in that, the bottom of described flue gas washing jar (2) is provided with agitator.
4. flue gas of sintering machine device according to claim 1 is characterized in that, described flue gas washing jar (2) inwall is provided with lining and moulds liner, and thickness is 2-5mm.
5. flue gas of sintering machine device according to claim 1 is characterized in that, is provided with demist layer, spraying layer and desulfurizing agent stock tank in described absorption tower (4) from top to bottom successively.
6. technology of utilizing the described flue gas of sintering machine device of claim 1 sintering device flue gas to be carried out desulfurization; Comprise: sintering device flue gas is fed the absorption tower through gas approach carry out wet desulphurization; It is characterized in that; Described spray thrower extracts the flue gas washing pot bottom through circulating pump cleaning solution sprays processing to the sintering device flue gas through it, and the cleaning solution behind the spray is back in the washing tank; Said cleaning solution is lime stone slurry or lime slurry.
7. technology according to claim 7 is characterized in that, the pH value of described cleaning solution maintains 2.5-3.8.
8. technology according to claim 7 is characterized in that, also is added with antifoaming agent in the described cleaning solution, and the consumption of said antifoaming agent is 5-10g/m
3D.
9. technology according to claim 7 is characterized in that, the liquid-gas ratio when described spray is handled is 2-5L/m
3
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| CN103191637A (en) * | 2013-04-23 | 2013-07-10 | 瓮福（集团）有限责任公司 | Industrial exhaust gas desulfurizer |
| CN104190239A (en) * | 2014-08-15 | 2014-12-10 | 浙江天翔环保设备有限公司 | High-efficiency desulfurization device |
| CN104258721A (en) * | 2014-09-23 | 2015-01-07 | 东方电气集团东方锅炉股份有限公司 | Low-energy-consumption and ultraclean-emission flue gas desulfurization method and device |
| CN107648998A (en) * | 2017-11-13 | 2018-02-02 | 盐城工学院 | A kind of oxidized form compound additive for Wet Fgd By Limestone and preparation method thereof |
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| CN202427355U (en) * | 2011-12-27 | 2012-09-12 | 浙江天蓝环保技术股份有限公司 | Flue gas desulfurization device of sintering machine |
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| CN102423613A (en) * | 2011-08-23 | 2012-04-25 | 武汉兴能环保技术有限公司 | Ammonia desulphurization method for effectively removing chlorine, fluorine ions and heavy metal ions |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103191637A (en) * | 2013-04-23 | 2013-07-10 | 瓮福（集团）有限责任公司 | Industrial exhaust gas desulfurizer |
| CN104190239A (en) * | 2014-08-15 | 2014-12-10 | 浙江天翔环保设备有限公司 | High-efficiency desulfurization device |
| CN104190239B (en) * | 2014-08-15 | 2016-04-13 | 浙江天翔环保设备有限公司 | A kind of high effective desulphurization device |
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| CN107648998A (en) * | 2017-11-13 | 2018-02-02 | 盐城工学院 | A kind of oxidized form compound additive for Wet Fgd By Limestone and preparation method thereof |
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Application publication date: 20120704 |