CN101829482B - Negative energy consumption dioxin emission reducing system of sintering machine and method thereof - Google Patents
Negative energy consumption dioxin emission reducing system of sintering machine and method thereof Download PDFInfo
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Abstract
The invention relates to a negative energy consumption dioxin emission reducing system of sintering machine and a method thereof. The system comprises a main flue, a dust remover, a bypass flue, a circulating flue, a circulating fan and a circulating gas hood. A high-concentration area wind chamber is arranged in an area accounting for 55 to 95 percent of the length from a sintering machine head to a machine tail of a sintering machine trolley; a low-concentration area wind chamber is connected with the main flue to reach a flue sequentially from the dust remover, the fan and a desulfurizing tower so as to exhaust smoke into air; a circulating gas hood is covered above the sintering machine trolley; the high-concentration area wind chamber is connected with the circulating gas hood through the circulating flue; and the circulating flue is provided with the dust remover and the circulating fan. The method comprises the following steps of collecting the smoke, removing dust, mixing the smoke of the low-concentration area with the smoke of the high-concentration area to remove the dust, performing desulfuration on the smoke, exhausting the smoke into the air and the like. The system has the advantages of simple and convenient construction, installation, operation management and maintenance, shorter construction period, the negative cost operation for emission reduction of the dioxin, and obvious energy-conservation and emission-reduction effects.
Description
Technical field
The present invention relates to the reduction of discharging of metallurgy industry sintering process dioxin and the heat recovery of sintering machine high-temperature flue gas, specifically relate to negative energy consumption dioxin emission reducing system of sintering machine and method thereof in a kind of iron and steel manufacturing industry sintering circuit.
Background technology
Dioxin is the general name of many chloros dibenzo dioxin and many chloros dibenzofurans, difficult degradation, is easy to biological concentration, is the material of the tool carcinogenic potential found up to now, and in human one-level carcinogenic substance is listed it by IARC.According to one's analysis, the discharge capacity of sintering dioxin accounts for about 95% of whole steel industry total emission volumn; Therefore, the dioxin emission reducing of steel industry at first should be set about from sintering circuit.
At present, existing dioxin emission reducing technology mainly contains methods such as fast cooling, active carbon adsorption, high-temperature oxydation, catalytic decomposition, but investment is big, operating cost is high, is difficult to promote on a large scale, and the method that has and be not suitable for sintering.
Steel industry is China industrial consumption energy rich and influential family, and the sintering circuit energy consumption accounts for 9%～12% of whole steel smelting procedures, is only second to ironmaking, but the first pollution rich and influential family of whole industry.It is thus clear that the energy-saving and emission-reduction of sintering circuit are significant to the pollution reduction that reduces Iron and Steel Production energy consumption and whole industry.
Dioxin is the white crystals body, is a kind of highly stable compound, 303 ℃～306 ℃ of fusing points, and 421 ℃～447 ℃ of boiling points do not have polarity, and the utmost point is insoluble in water and soda acid, just begins more than 700 ℃ to decompose, and can decompose fast more than 1100 ℃.
Dioxin differs widely along the toxic equivalent concentration in each bellows of sintering pallet horizontal direction.Discover; Dioxin toxic equivalent concentration peak generally appears at pallet roughly about 80% position (from the head to the tail, calculating by 100%); 55%～95% position all belongs to area with high mercury, and this regional dioxin generation accounts for about 80% of all total generation.
In view of this, seek a kind of negative energy consumption dioxin emission reducing system of sintering machine and method thereof and become pursuing one's goal of these those skilled in the art.
Summary of the invention
Task of the present invention provides a kind of negative energy consumption dioxin emission reducing system of sintering machine and method thereof; It has solved above-mentioned existing in prior technology problem; Meet environmental protection requirement and energy-saving and emission-reduction requirement; According to the size of control amount of circulating gas and the extraction location of adjustment circulating flue gas, to reach a large amount of reduction of discharging dioxin, the purpose of protection environment.
Technical solution of the present invention is following:
A kind of negative energy consumption dioxin emission reducing system of sintering machine; Dioxin concentration according to the region just is divided into area with high mercury wind chamber and low concentration region wind chamber with all wind chambers of sintering pallet bottom, comprises main smoke discharging pipe, deduster, bypass flue, circulation smoke pipe road, circulating fan and circulation petticoat pipe;
Said area with high mercury wind chamber is arranged on from the sintering machine head end of sintering pallet to 55% to 95% length areas tail;
Said low concentration region wind chamber connects main smoke discharging pipe, arrives chimney through deduster, blower fan, desulfurizing tower successively, is discharged in the atmosphere;
Said circulation petticoat pipe cover cap is above sintering pallet, and said area with high mercury wind chamber connects the circulation petticoat pipe through circulation smoke pipe road, and said circulation smoke pipe road is provided with deduster and circulating fan;
Said main smoke discharging pipe connects circulation smoke pipe road through the bypass flue.
Said negative energy consumption dioxin emission reducing system of sintering machine also comprises transfer valve, is arranged on the circulation smoke pipe road and between area with high mercury wind chamber and deduster.
Said negative energy consumption dioxin emission reducing system of sintering machine also comprises mixer selector valve, is arranged on the circulation smoke pipe road and between transfer valve and deduster.
Said negative energy consumption dioxin emission reducing system of sintering machine also comprises transfer valve, is arranged on the bypass flue.
Said negative energy consumption dioxin emission reducing system of sintering machine also comprises waste heat boiler and transfer valve, and said waste heat boiler is arranged between deduster and the circulating fan, and the waste heat boiler two ends are provided with transfer valve respectively.
Said negative energy consumption dioxin emission reducing system of sintering machine also comprises bypass pipe and transfer valve, and said bypass pipe is communicated with the circulation smoke pipe road that is positioned at the waste heat boiler both sides, and said transfer valve is arranged on the bypass pipe.
Said circulating fan is provided with silencer.
Said deduster is cyclone dust collectors or iris type deduster.
A kind of sintering machine negative energy consumption dioxin emission reducing method adopts described negative energy consumption dioxin emission reducing system of sintering machine, may further comprise the steps:
The flue gas of A, collection area with high mercury, and after therefrom extracting the part flue gas ash removal, the top that is circulated back to sintering machine is as combustion-supporting gas;
The flue gas of B, collection low concentration region mixes the back dedusting with the flue gas of area with high mercury;
C, with the common desulfurization of above-mentioned two-part flue gas;
D, the gas after the desulfurization is discharged into atmosphere.
The exhaust gas volumn that circulates in the said steps A is 30% to 50% of total exhaust gas volumn.
The object of the invention is exactly the sintering dioxin emission reducing technical scheme that a kind of negative energy consumption or least cost will be provided according to the character of above-mentioned result of study and dioxin; Particular content is: with sintering machine high dioxin flue gas single collection and be recycled to sintering machine top as combustion air, the high temperature through 1300 ℃ of sinter beds is with its quick decomposition; According to the size of amount of circulating gas and the extraction location of circulating flue gas, can reach reduction of discharging dioxin about 70% or the above object.
Because the temperature of this part flue gas can reach 350 ℃～400 ℃, the high-temperature flue gas of participating in circulation is provided with the waste heat boiler recovered steam is used for generating or SINTERING PRODUCTION; The flue-gas temperature of coming out from waste heat boiler still reaches about 150 ℃, can practice thrift solid-fuelled use amount as the sintering combustion air, has apparent in view energy-saving effect, is a comprehensive energy-saving and emission-reduction new technology, can guarantee that sinter quality is constant.
Technical scheme of the present invention all is suitable for new, as to change, extend sintering machine and existing sinter fume dioxin reduction of discharging.
The present invention starts with from the generation of analyzing the sintering process dioxin, finds that the sintering dioxin mainly is created in the zone apart from sintering machine head end 55%～95%; Through analog computation, think that the generation of this regional dioxin accounts for about 80% of its total generation.It is representative with the active carbon adsorption that the main flow dioxin removes technology, after charcoal absorption, can remove the most dioxin in the flue gas, and removal efficiency is high, but invest huge, operating cost is high, be difficult to large tracts of land and promote.The present invention passes through the high dioxin of sintering zone flue gas single collection; After dedusting, send the waste heat boiler recovered steam; Be recycled to sintering machine top then as combustion air, with respect to other technology more economically, rationally, meet energy-saving and emission-reduction and national conditions; And building aspects such as construction and installation, Operation Administration and Maintenance also more simply, conveniently, its maximum characteristics are to realize negative operation cost.
The present invention makes it compared with prior art owing to adopted above technical scheme, and the present invention has the following advantages:
1, through the formation of analysis sintering process dioxin and the Changing Pattern of toxic equivalent concentration; Selectively the high dioxin flue gas of sintering is circulated; Dioxin in the circulating flue gas is removed through the sinter bed high-temperature oxydation, and whole process need not be added and removed agent.
2, the steam that produces through waste heat boiler recovery circulating flue gas waste heat can be used for generating or sintering self is produced; The flue gas that comes out from waste heat boiler is used as sintering combustion air (containing certain density CO and some organic matters the flue gas); Can reduce the use amount of sintering solid fuel, total energy-saving effect can reach 8%～10%.
3,, can reduce the construction investment and the operating cost of main exhauster, follow-up dedusting, desulphurization system and later denitrating system because flue gas recirculation makes sintering machine main exhauster exhausting amount reduce.
4, because flue gas recirculation makes SO in minimizing and the flue gas of total discharging exhaust gas volumn
2Enrichment, all will increase for the emission reduction effect of existing main deduster and desulfurizer, most atmosphere pollutions are all had certain emission reduction effect.
5, the circulating flue gas deduster can adopt investment and all very low cyclone dust collectors even the iris type deduster of operating cost, thereby realizes more low cost movement.
If 6 do not adopt present technique, this part circulating flue gas then must directly send main deduster and desulphurization system, will consume more electric energy; The present invention has made full use of the sensible heat and the latent heat of circulation sinter fume, can realize negative operation cost.
7, system of the present invention does not have critical substantial equipment except that waste heat boiler, and construction, installation, operational management and maintenance maintenance are all fairly simple, convenient, and construction period is shorter, can not influence SINTERING PRODUCTION to existing sintering machine transformation.
8, can accomplish negative operation cost to the reduction of discharging of dioxin, difficult problems such as the investment that exists with respect to present dioxin emission reducing is big, operating cost height belong to a kind of brand-new emission-reducing process, and effects of energy saving and emission reduction is with the obvious advantage, is also accepted by iron and steel enterprise more easily.
When 9, first stage of construction or amount of circulating gas are bigger, can not establish waste heat boiler, construction investment will be lower like this, equally also can realize negative operation cost.
Key of the present invention has been to disclose the Changing Pattern of dioxin toxic equivalent concentration in the different bellows flue gases of sintering process, and the high dioxin of sintering zone flue gas is circulated, and amount of circulating gas can reach 30%～50% of full exhaust gas volumn.
Description of drawings
Fig. 1 is a kind of structural representation that the negative energy consumption dioxin emission reducing system of sintering machine of waste heat boiler is set in the embodiments of the invention.
Fig. 2 is a kind of structural representation that the negative energy consumption dioxin emission reducing system of sintering machine of waste heat boiler is not set in the embodiments of the invention.
Fig. 3 is the flow chart of a kind of sintering machine negative energy consumption dioxin emission reducing method of the present invention.
Fig. 4 is the sketch map that each wind chamber of sintering machine is discharged the PCDD/F relative concentration situation of change in the flue gas.
Reference numeral:
1 is transfer valve, and 2 is transfer valve, and 3 is mixer selector valve, and 4 is deduster, and 5 is transfer valve, and 6 is waste heat boiler, and 7 is transfer valve, and 8 is bypass pipe, and 9 is transfer valve, and 10 are the bypass flue, and 11 are circulation smoke pipe road, and 12 is circulating fan, and 13 are the circulation petticoat pipe.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is elaborated.
At first referring to Fig. 2, a kind of negative energy consumption dioxin emission reducing system of sintering machine of the present invention mainly is made up of transfer valve 1, transfer valve 2, mixer selector valve 3, deduster 4, transfer valve 5, waste heat boiler 6, transfer valve 7, bypass pipe 8, transfer valve 9, bypass flue 10, circulation smoke pipe road 11, circulating fan 12, circulation petticoat pipe 13, deduster, blower fan, desulfurizing tower and chimney.
The present invention is divided into high dioxin zone and low dioxin zone with the wind chamber of pallet bottom; With the regional flue gas single collection that is produced of high dioxin; Top with this part flue gas recirculation to sintering machine is used as combustion air then; Dioxin at high temperature is decomposed, thereby reaches the reduction of discharging purpose.
Negative energy consumption dioxin emission reducing system of sintering machine of the present invention just is divided into area with high mercury wind chamber and low concentration region wind chamber with all wind chambers of sintering pallet bottom according to the dioxin concentration of region.The area with high mercury wind chamber is arranged on from the sintering machine head end of sintering pallet to 55% to 95% length areas tail, through analog computation, thinks that the generation of this regional dioxin accounts for about 80% of total generation.The low concentration region wind chamber connects main smoke discharging pipe; Arrive chimney through deduster, blower fan, desulfurizing tower successively; Be discharged in the atmosphere; Circulation petticoat pipe 13 cover caps are above sintering pallet, and the area with high mercury wind chamber connects circulation petticoat pipes 13 through circulation smoke pipe road 11, and circulating flue gas is evenly distributed and guarantees that in the petticoat pipe be negative pressure.Deduster 4 and circulating fan 12 are set on the circulation smoke pipe road 11, and main smoke discharging pipe connects circulation smoke pipe road 11 through bypass flue 10.
According to on-the-spot actual needs, can on circulating fan 12, silencer be set.The deduster 4 that adopts can be cyclone dust collectors or iris type deduster.
Referring again to Fig. 1, also can the waste heat boiler recovered steam be set to the high-temperature flue gas of participating in circulation, be used for generating or SINTERING PRODUCTION, between deduster 4 and the circulating fan 12 waste heat boiler 6 is set, waste heat boiler 6 two ends are provided with transfer valve 5 and transfer valve 7 respectively.Bypass pipe 8 is communicated with the circulation smoke pipe road 11 that is positioned at waste heat boiler 6 both sides, and bypass pipe 8 is provided with transfer valve 9.Valve-off 5 and 7 when waste heat boiler 6 needs maintenance, Open valve 9 does not influence the operation of this technology simultaneously.
Referring to Fig. 3,, adopt above-mentioned negative energy consumption dioxin emission reducing system of sintering machine at last, may further comprise the steps by a kind of sintering machine negative energy consumption dioxin emission reducing method of the present invention:
The flue gas of A, collection area with high mercury, and after therefrom extracting the part flue gas ash removal, the top that is circulated back to sintering machine is as combustion-supporting gas.
The flue gas of B, collection low concentration region mixes the back dedusting with the flue gas of area with high mercury.
C, with the common desulfurization of above-mentioned two-part flue gas.
D, the gas after the desulfurization is discharged into atmosphere.
Wherein, the exhaust gas volumn that circulates in the steps A is 30% to 40% of total exhaust gas volumn.
The present invention is applicable to the dioxin emission reducing in the sintering process, the waste heat recovery of sintering machine afterbody high-temperature flue gas.In the embodiments of the invention, along the sintering pallet horizontal direction, the wind chamber that the chassis bottom is all is divided into high dioxin zone and low dioxin zone (see figure 4), and sinter fume is pressed pallet horizontal direction Fractional Collections.
The generation of high dioxin zone dioxin accounts for about 80% of total generation, and this part flue gas single collection is sent into the waste heat boiler recovered steam after dedusting, is recycled to sintering machine top then as combustion air.This system consists of the following components (seeing Fig. 1 and Fig. 2): circulation petticoat pipe, waste heat boiler, circulating flue gas deduster, circulating flue gas pipeline, various transfer valves etc.Concrete implementation is:
High dioxin bellows are connected with circulating flue gas pipeline 11, and circulating flue gas deduster 4 is installed in before the waste heat boiler 6, are used for removing the large-size particles thing of flue gas, to guarantee the normal and stable operation of waste heat boiler and blower fan.
Be connected through bypass duct 10 between main smoke discharging pipe and the circulating flue gas pipeline 11, valve-off 1, Open valve 2 when the circulatory system need be overhauled can not influence SINTERING PRODUCTION like this, can utilize the negative pressure in the aperture control wind chamber of valve simultaneously.
Circulating flue gas deduster 4 is connected with waste heat boiler 6, at waste heat boiler 6 two ends bypass pipe 8 is set, valve- off 5 and 7 when waste heat boiler 6 needs maintenance, and Open valve 9 does not influence the operation of this technology simultaneously.
Waste heat boiler 6 is connected with circulating fan 12, and mixer selector valve 3 is set before deduster, is used for improving the oxygen content in the circulating flue gas in case of necessity, can the central cooler hot blast be inserted with further raising energy-saving effect.
Circulating fan 12 is connected with circulation petticoat pipe 1, and with the even amount of leaking into that distributes and reduce air of circulating flue gas, requiring the assurance petticoat pipe interior is negative pressure.
If amount of circulating gas is bigger, the mean temperature of circulating flue gas will reduce, and it is uneconomical that establish waste heat boiler this moment, can waste heat boiler be cancelled, and sees Fig. 2.
Find through analysis and research; Toxic equivalent concentration along dioxin in each bellows of sintering pallet horizontal direction is different; Its peak generally appears at pallet roughly about 80% position (being 100%) from the head to the tail; 55%～95% position all belongs to high dioxin zone, and this regional dioxin generation accounts for about 80% of all total generation.
This part flue gas single collection is recycled to sintering pallet top as combustion air, and dioxin is decomposed under the high temperature of 1300 ℃ of sinter beds, can the dioxin total emission volumn be reduced about 70%.Because the temperature of this part sinter fume is the highest, through the waste heat boiler recovered steam, the sensible heat of circulating flue gas remainder and latent heat are sintered bed of material utilization, can reduce the use amount of sintering solid fuel, thereby reach the purpose of negative energy consumption dioxin emission reducing.
Certainly; Those skilled in the art in the present technique field will be appreciated that; The foregoing description only is to be used for explaining the present invention; And be not with opposing qualification of the present invention, as long as in connotation scope of the present invention, all will drop in the scope of claim of the present invention the variation of the foregoing description, modification etc.
Claims (10)
1. sintering machine dioxin emission reducing system; Dioxin concentration according to the region just is divided into area with high mercury wind chamber and low concentration region wind chamber with all wind chambers of sintering pallet bottom, it is characterized in that: comprise main smoke discharging pipe, deduster, bypass flue, circulation smoke pipe road, circulating fan and circulation petticoat pipe;
Said area with high mercury wind chamber is arranged on from the sintering machine head end of sintering pallet to 55% to 95% length areas tail;
Said low concentration region wind chamber connects main smoke discharging pipe, arrives chimney through deduster, blower fan, desulfurizing tower successively, is discharged in the atmosphere;
Said circulation petticoat pipe cover cap is above sintering pallet, and said area with high mercury wind chamber connects the circulation petticoat pipe through circulation smoke pipe road, and said circulation smoke pipe road is provided with deduster and circulating fan;
Said main smoke discharging pipe connects circulation smoke pipe road through the bypass flue.
2. sintering machine dioxin emission reducing system as claimed in claim 1 is characterized in that: also comprise transfer valve, be arranged on the circulation smoke pipe road and between area with high mercury wind chamber and deduster.
3. sintering machine dioxin emission reducing system as claimed in claim 2 is characterized in that: also comprise mixer selector valve, be arranged on the circulation smoke pipe road and between transfer valve and deduster.
4. sintering machine dioxin emission reducing system as claimed in claim 1 is characterized in that: also comprise transfer valve, be arranged on the bypass flue.
5. sintering machine dioxin emission reducing system as claimed in claim 1 is characterized in that: also comprise waste heat boiler and transfer valve, said waste heat boiler is arranged between deduster and the circulating fan, and the waste heat boiler two ends are provided with transfer valve respectively.
6. sintering machine dioxin emission reducing system as claimed in claim 1 is characterized in that: also comprise bypass pipe and transfer valve, said bypass pipe is communicated with the circulation smoke pipe road that is positioned at the waste heat boiler both sides, and said transfer valve is arranged on the bypass pipe.
7. sintering machine dioxin emission reducing system as claimed in claim 1 is characterized in that: said circulating fan is provided with silencer.
8. sintering machine dioxin emission reducing system as claimed in claim 1 is characterized in that: said deduster is cyclone dust collectors or iris type deduster.
9. a sintering machine dioxin emission reducing method adopts like any described sintering machine dioxin emission reducing system in the claim 1 to 8, it is characterized in that: may further comprise the steps:
The flue gas of A, collection area with high mercury, and after therefrom extracting the part flue gas ash removal, the top that is circulated back to sintering machine is as combustion-supporting gas;
The flue gas of B, collection low concentration region mixes the back dedusting with the flue gas of area with high mercury;
C, with the common desulfurization of above-mentioned two-part flue gas;
D, the gas after the desulfurization is discharged into atmosphere.
10. sintering machine dioxin emission reducing method as claimed in claim 9 is characterized in that: the exhaust gas volumn that circulates in the said steps A is 30% to 50% of total exhaust gas volumn.
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| CN201010174501A CN101829482B (en) | 2010-05-13 | 2010-05-13 | Negative energy consumption dioxin emission reducing system of sintering machine and method thereof |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101983751B (en) * | 2010-11-05 | 2012-06-06 | 浙江菲达脱硫工程有限公司 | Device and method for removing smoke pollutants of sintering machine |
| CN102022914A (en) * | 2010-12-08 | 2011-04-20 | 江阴兴澄特种钢铁有限公司 | Self-cyclic utilization device for sinter machine tail smoke and tail wind box smoke |
| CN102901365B (en) * | 2011-07-27 | 2015-04-22 | 宝山钢铁股份有限公司 | Low-energy-consumption method for reducing emission of dioxin in sintering waste gas |
| CN102936651B (en) * | 2012-10-23 | 2015-10-07 | 鞍钢股份有限公司 | Sintering simultaneous desulfurization and denitrification system and desulfurization and denitrification method thereof |
| CN105091615B (en) * | 2015-08-06 | 2017-10-31 | 中南大学 | A kind of integrated conduct method of agglomeration for iron mine flue gas pollutant |
| CN107051202B (en) * | 2017-06-13 | 2020-06-12 | 武汉钢铁有限公司 | Sintering flue gas subregion circulation coupling smoke and dust autocatalytic denitration system |
| CN107413193B (en) * | 2017-06-13 | 2020-06-02 | 武汉钢铁有限公司 | Sintering flue gas zoned circulating smoke catalytic denitration process |
| CN110333326B (en) * | 2019-08-07 | 2024-04-16 | 马鞍山钢铁股份有限公司 | Sintering circulation flue gas simulation system and experimental method |
| CN110538560A (en) * | 2019-09-24 | 2019-12-06 | 北京中航泰达环保科技股份有限公司 | Combined desulfurization and ozone pre-oxidation denitrification system and method using sintering flue gas circulation |
| CN110579113A (en) * | 2019-09-30 | 2019-12-17 | 马鞍山钢铁股份有限公司 | A sintering machine waste gas recycling system |
| CN112985090A (en) * | 2019-12-16 | 2021-06-18 | 百色学院 | Method for removing partial water of mixture after material distribution of sintering machine |
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| CN2775496Y (en) * | 2005-03-17 | 2006-04-26 | 蒋惠民 | Low cost high efficiency dust removing desulfurizing device |
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