CN101024143A - Sinter-smoke circulation collected desulfurizing method and apparatus - Google Patents
Sinter-smoke circulation collected desulfurizing method and apparatus Download PDFInfo
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- CN101024143A CN101024143A CN 200710034252 CN200710034252A CN101024143A CN 101024143 A CN101024143 A CN 101024143A CN 200710034252 CN200710034252 CN 200710034252 CN 200710034252 A CN200710034252 A CN 200710034252A CN 101024143 A CN101024143 A CN 101024143A
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Abstract
The invention discloses a sintering flue gas desulfurization cycle enrichment methods and device, the described method from the sintering machine take part gas return to the top of sintering machine sealed enclosures within cycle, while complementing sintering machine burning need oxygen, the remaining part of the flue gas discharge after desulfurization. In devices, including dedusting device of flue gases between the chimney and flue, in the road before the desulfurization setup a branch pipeline to connect sintering machine sealed enclosures, in the branches of pipe setup cycle fan and supplement device. This invention due to sintered exhaust gas partly return to the seal trolley of sintering machine to reduce the displacement of gas, thereby reducing the total of dust and exhaust gas, while the SO2 of the sintering process play a enrichment role, to increase desulfurization efficiency, and reduce release total of burning exhaust gas, reducing the processing load of desulfurization device.
Description
Technical field
The invention belongs to desulfurizer, be specifically related to a kind of method and device that is used for the sinter-smoke circulation collected desulfurizing of metallurgy industry sintering machine.
Background technology
The sintering process of existing iron and steel metallurgical industry generally adopts negative pressure down draft sintering technology, exists thus that the sinter fume discharge capacity is big, SO
2Characteristics such as concentration is low cause that construction investment is big, operation cost is high and are difficult to handle.
The sintering plant of iron and steel enterprise of domestic existing several family has been taked the flue gas desulfurization treatment measures to the sinter fume of small-sized sintering machine, the flue-gas dust-removing and desulfurization device promptly is set between flue that compiles sintering device flue gas and chimney (can adopts existing sulfur removal technology device, the wet method, dry method and the semidry method that comprise the calcium method, ammonia process, amine process, process units such as seawater method), whole sinter fumes being carried out desulfurization handles.This desulfurization method, the problem of existence has: the flue gas treating capacity is big, causes that construction investment is big, operation cost is high; SO
2Concentration is low, causes desulfuration efficiency on the low side.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, provide a kind of and can reduce smoke discharge amount, improve SO in the smoke treatment
2The method of the sinter-smoke circulation collected desulfurizing of concentration and device.
The method that realizes first kind of sinter-smoke circulation collected desulfurizing that the object of the invention adopts is: get from the sintering machine flue in the seal closure that part of smoke turns back to sintering machine top and circulate, replenish the sintering machine needed oxygen that burns simultaneously, the remainder flue gas is handled the back through desulfurization and is discharged.
It is 50% proper that the exhaust gas volumn that is used to circulate in the described method is about.
The device that described method adopts comprises the flue-gas dust-removing and desulfurization device that is connected between sintering machine flue and the chimney, establishes a branch line on the pipeline before desulfurization and is connected to the sintering machine seal closure, and circulating fan and oxygenating facility are set on branch line.The oxygenating facility can adopt various ways, comprise the oxygenating blower fan, carry heat-containing waste gas, the part of central cooler to open wide the sintering pallet seal closure or connect secondary air channel and valve etc. on seal closure with pipeline, the various combination that perhaps adopts them is sintering machine supplemental oxygen and balance tolerance.
On branch line, also the damper transfer valve can be set, so that switch the flow direction of flue gas as required.
Said method and device adopt single flue, can be described as the single flue scheme, are fit to small-sized sintering machine.
The method of second kind of sinter-smoke circulation collected desulfurizing of the present invention is: sintering machine adopts two flues, gets a part of low concentration SO with a flue from sintering machine head and afterbody bellows
2Flue gas turns back in the seal closure on sintering machine top and circulates, and replenishes the sintering machine needed oxygen that burns simultaneously, with the high concentration SO of another flue with the middle part bellows of sintering machine
2Flue gas is discharging after desulfurization is handled.
The device that described second method adopts is included in two flues is set under the sintering machine wind box, and a flue is that cycle flue joins with sintering machine head and afterbody bellows; Another flue joins for bellows in the middle part of discharging flue and the sintering machine; Wherein cycle flue joins by pipeline and sintering machine seal closure, and circulating fan and oxygenating facility are set on the pipeline, and the oxygenating facility is identical with device in first kind of scheme can to adopt various ways; The discharging flue joins by flue-gas dust-removing and desulfurization device and chimney.
On the pipeline that connects cycle flue and sintering machine seal closure, also deduster, silencer can be set, damper transfer valve etc.
After partially sintering the machine bellows with on cycle flue and the parallel pipeline that is connected of discharging flue, transfer valve can be set, as the airflow balance optimal control device of sintering system.
This method and device can be described as the twin flue scheme owing to adopt twin flue, are fit to large-type sinterer.
Sintering process is expected on the chassis that is covered with grate-layer material for iron material, flux and fuel being added the water uniform cloth in back that fully mixes, granulates, light a fire through ignition furnace, under the effect of main exhauster, carry out the negative pressure sintering, because compound carries out in the sintering from top to bottom on chassis, pallet also moves to tail from head, when material to be mixed sintered to pallet bottom, pallet also ran to about second bellows of sintering machine afterbody.Because in the sintering process, the sintering bellows progressively are increased to from the A-P temperature about second bellows of sintering machine afterbody and are peak (being sintering end point).The sintering bellows are from A-P SO
2The concentration of content progressively raises, and one or two bellows of back reach maximum partially to the sintering machine middle part, reduce gradually subsequently.
For the single flue scheme that small-sized sintering machine relatively is fit to, can not consider the SO in the sintering machine wind box
2Concentration is with the variation of flue-gas temperature in the bellows, and the complete mixed partial fume of each bellows flue gas is returned the sintering process system sintering that circulates, and the remainder flue gas carries out the technology that desulfurization is handled, and reduces smoke discharge amount by circulation.Because some flue gas returns sintering machine and forms circulation all the time, makes the SO in the sintering machine discharged flue gas
2Constantly enrichment, concentration improves constantly, and has also improved simultaneously to enter into desulfurization treating apparatus flue gas SO
2Concentration.
The twin flue technical scheme is considered the SO in the large-type sinterer bellows
2Concentration is different characteristics with the variation of flue-gas temperature in the bellows, flue is divided for high-sulfur system and low-sulfur system, bellows under the sintering machine are distinguished, and making the flue gas of low-sulfur part advance low-sulfur is the flue sintering enrichment that circulates, and it is that flue carries out desulfurization that the flue gas of high-sulfur part directly advances high-sulfur.
The present invention since with the sintered discharge gas in the sintering process in dedusting after main exhauster partly return on the sealing chassis of sintering machine, to reduce the outer discharge capacity of the flue gas that produces in the sintering process, thereby the flue dust and the total amount of waste gas, the SO simultaneously that efflux in the sintering process have been reduced to producing in the sintering process
2Play enrichment, both improved SO in the sintered discharge gas
2Concentration, improve desulfuration efficiency, reduced the total emission volumn of sinter fume again, reduced the treating capacity of desulfurizer, saved the floor space and the construction investment of desulphurization system, and can save the operating cost of desulphurization system.
Further specify technical scheme of the present invention below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the structural representation of single flue technical scheme of the present invention.
Fig. 2 is the structural representation of twin flue technical scheme of the present invention.
The specific embodiment
The sinter-smoke circulation collected desulfurizing method that is used for single flue is: get to be about in the seal closure that 50% flue gas turns back to sintering machine top from the sintering machine flue and circulate, replenish the sintering machine needed oxygen that burns simultaneously, the remainder flue gas is handled the back through desulfurization and is discharged.
Embodiment 2
As shown in Figure 1.The sinter-smoke circulation collected desulfurizing device that is used for single flue comprises sintering machine seal closure 1, sintering pallet 2, sintering machine wind box 3, sintering machine large flue 4, deduster 5, blower fan inlet adjusting valve 6, main exhauster 7, silencer 8, damper transfer valve 9, circulating fan 10, oxygenating blower fan 11, cold wind inlet valve 12, damper transfer valve 14, damper transfer valve 15, damper transfer valve 16, sulfur removal technology device 13 (can adopt existing sulfur removal technology device, the wet method that comprises the calcium method, dry method and semidry method, ammonia process, amine process, process units such as seawater method), chimney 17.Seal closure 1 is set up on sintering pallet 2 tops, chassis 2 bottoms connect sintering machine wind box 3, bellows 3 are collected to flue 4, cold wind inlet valve 12 is installed in the position of flue 4 near afterbody, connect deduster 5 behind the flue 4 successively, blower fan inlet adjusting valve 6, main exhauster 7, silencer 8, again through threeway difference flue baffle plate transfer valve 9 and damper transfer valve 14 or damper transfer valve 15, connect circulating fan 10 behind the damper transfer valve 9, the other oxygenating blower fan 11 of setting up of pipeline before advancing sintering machine seal closure 1, connect desulfurizer 13 behind the damper transfer valve 14, connect damper transfer valve 16 again, connect chimney 17 subsequently, connect chimney 17 behind the damper transfer valve 15.
The workflow of single flue sinter-smoke circulation collected desulfurizing device is as follows: under the effect of the negative pressure exhausting of main exhauster 7; air enters sintering machine wind box 3 by sintering pallet 2; be collected to flue 4 again; enter deduster 5 then; blower fan inlet adjusting valve 6; main exhauster 7; silencer 8; flue gas is divided into two parts subsequently; a part enters sintering machine seal closure 1 after the suction effect of circulating fan 10 is by damper transfer valve 9; the other oxygenating blower fan 11 of setting up of pipeline before entering sintering machine seal closure 1; in pipeline, add new air by oxygenating blower fan 11; deficiency and balance sintering system air quantity with oxygen content in the replenishment cycles flue gas; the booster fan suction desulfurizer 13 that another part flue gas is desulfurized in the device 13 carries out desulfurization; desulfurization is after chimney enters atmosphere; when desulfurizer 13 goes wrong the needs shutdown; open damper transfer valve 15; this partial fume directly enters chimney, enters atmosphere through chimney.Detect temperature greater than more than 180 ℃ the time in the deduster inlet temperature, the cold wind inlet valve 12 on the flue 4 is opened, and puts into cold wind to reduce the temperature of flue 4 sinter fumes, when temperature is reduced to 140 ℃, closes cold wind inlet valve 12.Air pressure in the control sintering machine seal closure is about-40Pa.
The sinter-smoke circulation collected desulfurizing method that is used for twin flue is: sintering machine adopts two flues, gets a part of low concentration SO with a flue from sintering machine head and afterbody bellows
2Flue gas turns back in the seal closure on sintering machine top and circulates, and replenishes the sintering machine needed oxygen that burns simultaneously, with the high concentration SO of another flue with the middle part bellows of sintering machine
2Flue gas is discharging after desulfurization is handled.
See Fig. 2.The sinter-smoke circulation collected desulfurizing device that is used for twin flue is to set up seal closure 21 on sintering pallet 22 tops, and chassis 22 bottoms connect sintering machine wind box 23, establishes transfer valve 223 after partially sintering machine bellows 23, presses SO in the flue gas
2The content of concentration is with SO in sintering machine head and the afterbody bellows 23
2The flue gas that concentration is low is collected to cycle flue 24, cold wind inlet valve 212 is installed in the position of cycle flue 24 near afterbody, connect the pipeline that taps into sintering machine seal closure 21 behind deduster 25, blower fan inlet adjusting valve 26, circulating fan 27, the silencer 28 behind the cycle flue 24 successively, the other oxygenating blower fan 211 of setting up of the pipeline before advancing sintering machine seal closure 21; Press SO in the flue gas
2The content of concentration is with SO in the bellows 23 of sintering machine middle part
2The flue gas that concentration is high is collected to discharging flue 218, cold wind inlet valve 224 is installed in the position of discharging flue 218 near afterbody, connect deduster 219 successively behind the discharging flue 218, blower fan inlet adjusting valve 220, main exhauster 221, silencer 222, again through threeway difference flue baffle plate transfer valve 214 and damper transfer valve 215, connect desulfurizer 213 behind the damper transfer valve 21 4 and (can adopt existing sulfur removal technology device, the wet method that comprises the calcium method, dry method and semidry method, ammonia process, amine process, process units such as seawater method), connect damper transfer valve 216 again, connect chimney 217 subsequently, damper transfer valve 215 connects chimney 217.
The workflow of twin flue sinter-smoke circulation collected desulfurizing device is as follows: under the effect of the negative pressure exhausting of circulating fan 27, air enters sintering machine wind box 23 by sintering pallet 22, SO in sintering machine head and the afterbody bellows 23
2The flue gas that concentration is low is collected to cycle flue 24, enter deduster 25 then, blower fan inlet adjusting valve 26, circulating fan 27, silencer 28, enter sintering machine seal closure 21 by the road, the other oxygenating blower fan 211 of setting up of pipeline before advancing sintering machine seal closure 21, in pipeline, add new air by oxygenating blower fan 211, deficiency and balance sintering system air quantity with oxygen content in the replenishment cycles flue gas, in order to protect electric cleaner 25 and circulating fan 27, detect temperature greater than more than 180 ℃ the time in deduster 25 inlet temperatures, cold wind inlet valve 212 on the flue is opened and is put into cold wind to reduce the temperature of cycle flue sinter fume, when temperature is reduced to 140 ℃, close cold wind inlet valve 212; SO in the bellows 23 of sintering machine middle part
2The flue gas that concentration is high is collected to discharging flue 218, enter deduster 219, blower fan inlet adjusting valve 220, main exhauster 221, silencer 222 then, under accident conditions, close damper transfer valve 214 and damper transfer valve 216, make flue gas enter chimney 217, under normal operation, close damper transfer valve 215, open damper transfer valve 214 and damper transfer valve 216, the booster fan suction desulfurizer 213 that flue gas is desulfurized in the device 213 carries out desulfurization, and desulfurization is after chimney 217 enters atmosphere.In order to protect electric cleaner and blower fan; detect temperature greater than more than 180 ℃ the time in deduster 219 inlet temperatures; cold wind inlet valve 224 on the discharging flue 218 is opened and is put into cold wind to reduce the temperature of flue 218 sinter fumes, when temperature is reduced to 140 ℃, closes cold wind inlet valve 224.Air pressure in the control sintering machine seal closure 21 is about-40Pa.
Claims (8)
1, a kind of method of sinter-smoke circulation collected desulfurizing, it is characterized in that from the sintering machine flue, getting in the seal closure that part of smoke turns back to sintering machine top and circulate, replenish the sintering machine needed oxygen that burns simultaneously, the remainder flue gas is handled the back through desulfurization and is discharged.
2, method according to claim 1 is characterized in that the exhaust gas volumn that is used to circulate is about 50%.
3, a kind of sinter-smoke circulation collected desulfurizing device that adopts the described method of claim 1, comprise the flue-gas dust-removing and desulfurization device that is connected between sintering machine flue and the chimney, it is characterized in that establishing on the pipeline before desulfurization a branch line and be connected to the sintering machine seal closure, circulating fan and oxygenating facility are set on branch line.
4, sinter-smoke circulation collected desulfurizing device according to claim 3 is characterized in that being provided with the damper transfer valve on branch line.
5, a kind of method of sinter-smoke circulation collected desulfurizing is characterized in that sintering machine adopts two flues, gets a part of low concentration SO with a flue from sintering machine head and afterbody bellows
2Flue gas turns back in the seal closure on sintering machine top and circulates, and replenishes the sintering machine needed oxygen that burns simultaneously, with the high concentration SO of another flue with the middle part bellows of sintering machine
2Flue gas is discharging after desulfurization is handled.
6, a kind of sinter-smoke circulation collected desulfurizing device that adopts the described method of claim 5 is characterized in that being included in two flues is set under the sintering machine wind box, and a flue is that cycle flue joins with sintering machine head and afterbody bellows; Another flue joins for bellows in the middle part of discharging flue and the sintering machine; Wherein cycle flue joins by pipeline and sintering machine seal closure, and circulating fan and oxygenating facility are set on the pipeline; The discharging flue joins by flue-gas dust-removing and desulfurization device and chimney.
7, sinter-smoke circulation collected desulfurizing device according to claim 6 is characterized in that deduster, silencer being set, the damper transfer valve at the pipeline that connects cycle flue and sintering machine seal closure.
8, according to claim 6,7 described sinter-smoke circulation collected desulfurizing devices, it is characterized in that after partially sintering the machine bellows with cycle flue and parallel pipeline that the discharging flue is connected on transfer valve is set, as the airflow balance optimal control device of flue gas recirculation system.
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