CN109269310A - It is a kind of based on the sinter waste-heat recovery device and method that erect cold kiln - Google Patents
It is a kind of based on the sinter waste-heat recovery device and method that erect cold kiln Download PDFInfo
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- CN109269310A CN109269310A CN201811011819.2A CN201811011819A CN109269310A CN 109269310 A CN109269310 A CN 109269310A CN 201811011819 A CN201811011819 A CN 201811011819A CN 109269310 A CN109269310 A CN 109269310A
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- sections
- flue
- sinter
- flues
- flue gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/04—Sintering
Abstract
Sinter heat recovery technology field is belonged to based on the sinter waste-heat recovery device and method that erect cold kiln the invention discloses a kind of, solves the problems, such as that sintering mine sensible heat recovery utilization rate is low in the prior art.Device includes sintering machine, bellows, flue and erects cold kiln；Along sintering machine traffic direction, flue is divided into A sections of flues, B sections of flues and C sections of flues；Along cold kiln direction from top to bottom is erected, erects cold kiln and be divided into high temperature section and low-temperature zone；The outlet flue of A sections of flues is connect with desulfurization unit, low-temperature zone, SCR denitration unit and chimney, the flue gas recirculation in B sections of flues to the corresponding sintering machine partial of A sections of flues.Method is B sections of flue gas recirculations to the corresponding sintering machine partial of A sections of flues；A sections of flue gases successively carry out desulfurization and the heat exchange of low-temperature zone sinter and denitration；C sections of flue gases and high temperature section sinter are exchanged heat, carry out waste heat recycling using waste heat recovery unit.Above-mentioned apparatus and method can be used for the recycling of sinter waste heat.
Description
Technical field
The present invention relates to a kind of sinter heat recovery technology more particularly to it is a kind of based on erect cold kiln sinter waste heat return
Receiving apparatus and method.
Background technique
For steel production in China based on the long process of blast furnace-converter, converter steel ratio reaches 90% or more.China's blast furnace burden
Sinter ratio reaches 70%~75% in structure, and China's Sintering Yield reaches 9.01 hundred million tons within 2014.2013, country issued
Cloth executes " crude steel produces master operation energy consumption of unit product quota of expenditure " (GB21256-2013), it is specified that sintering process unit produces
Product energy consumption limit value is≤55kgce/t, and access value is≤50kgce/t, and advanced value is≤45kgce/t, and waste heat recovery volume is advanced
Value is >=10kgce/t.The promotion of energy consumption standard will increase enterprise operation pressure, promote the corporation withdrawal market for being unsatisfactory for requiring,
Enterprise's pressure is huge.
Mainly sinter is cooled down by air blast on belt-cooling machine or ring cold machine currently with sinter waste heat, bottom
The cold wind that portion blasts carries out heat exchange with sinter when passing through red-hot sintering ore bed, generates a large amount of high-temp waste gas.Exhaust gas
It can be used for preheating igniting combustion air, generate steam or power generation.But such exhaust heat recovering method sintering mine sensible heat utilization rate
It is low.
Summary of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of based on the sinter waste-heat recovery device for erecting cold kiln and side
Method solves the problems, such as that sintering mine sensible heat recovery utilization rate is low in the prior art.
The purpose of the present invention is mainly achieved through the following technical solutions:
On the one hand, the present invention provides a kind of based on the sinter waste-heat recovery device for erecting cold kiln, including sequentially connected
Sintering machine, bellows, flue and erect cold kiln；Along sintering machine traffic direction, flue is divided into A sections of flues, B sections of flues and C sections of flues；Edge
Cold kiln direction from top to bottom is erected, cold kiln is erected and is divided into high temperature section and low-temperature zone；The outlet flue of A sections of flues successively with desulfurization unit, low
Temperature section, SCR denitration unit are connected with chimney, the flue gas recirculation in B sections of flues to the corresponding sintering machine partial of A sections of flues, C sections of cigarettes
The outlet flue in road is successively connect with high temperature section, C sections of UTILIZATION OF VESIDUAL HEAT IN units and chimney；The flue gas SO of B sections of flues2C sections of cigarettes of concentration >
The flue gas SO in road2The flue gas SO of A sections of flues of concentration >2Concentration；The flue gas NO of A sections of fluesXThe flue gas NO of B sections of flues of concentration >XIt is dense
Spend the flue gas NO of > C sections of flueXConcentration.
In a kind of possible design, the ratios of A sections of flues, B sections of flues and the corresponding bellows number of C sections of flues is 14~
16:5~9:4~6.
In a kind of possible design, at the outlet flue of low-temperature zone, the temperature of sinter is 400 DEG C~450 DEG C.
In a kind of possible design, the smoke inlet of high temperature section is set to the lower part of high temperature section, and outlet flue is set to high temperature
The top of section；The smoke inlet of low-temperature zone is set to the lower part of low-temperature zone, and outlet flue is set to the top of low-temperature zone.
In a kind of possible design, on the connecting line of A sections of flues and desulfurization unit and C sections of flues and high temperature section
Air-introduced machine is equipped on connecting line.
In a kind of possible design, air-introduced machine deduster is equipped with before the air inlet of air-introduced machine.
In a kind of possible design, on the connecting line of high temperature section and C sections of UTILIZATION OF VESIDUAL HEAT IN units and low-temperature zone and SCR
Cold kiln deduster is erected in setting on the connecting line of denitration unit.
In a kind of possible design, the connecting pipe of SCR denitration unit and chimney is equipped with A sections of UTILIZATION OF VESIDUAL HEAT IN units.
In a kind of possible design, device further includes broken sieve, and the sinter in sintering machine falls into height by broken sieve
In temperature section.
On the other hand, the present invention also provides a kind of based on the sinter exhaust heat recovering method for erecting cold kiln, using above-mentioned base
In the sinter waste heat apparatus for erecting cold kiln, method includes the following steps:
Raw materials for sintering feeding sintering machine is sintered, generates flue gas while producing sintering finished ores；B sections of flue gas recirculations
To the corresponding sintering machine partial of A sections of flues；A sections of flue gases pass through desulfurization unit desulfurization, the flue gas after desulfurization and the low temperature for erecting cold kiln
Section sinter exchanges heat, so that mixed flue-gas temperature rises to the suitable temperature of SCR denitration, carries out denitration；By C sections of flue gases
It exchanges heat with the high temperature section sinter for erecting cold kiln, obtains high-temperature flue gas, carry out waste heat recycling using waste heat recovery unit.
Compared with prior art, the present invention has the beneficial effect that:
A) provided by the invention based on the sinter waste-heat recovery device for erecting cold kiln, flue is divided into A sections of flues, B sections of flues
It with C sections of flues, erects cold kiln and is divided into high temperature section and low-temperature zone, effectively the flue gas after heat exchanging, which carries out waste heat recovery rate, can be improved
50% or more, waste heat recovery total greatly improves, to the maximum extent recovered flue gas and sintering mine sensible heat (most recycling).
For flue gas quality, the C section flue gas and high temperature section of high temperature exchange heat, and obtain high-temperature flue gas, mixed A sections of flue gas is changed with low-temperature zone
Heat obtains medium temperature flue gas, improves the flue gas quality for carrying sintering mine sensible heat, and it is lower to have taken traditional cooler production steam quality
And the drawbacks of instability of flow, it lays a good foundation for subsequent production steam quality from ton sinter generated energy is improved.Meanwhile
For the quality of sinter, heat sinter has insulation effect in high temperature section, carries out equalizing temperature and remaining fugitive constituent is precipitated
Process, thus pass through high temperature section, sinter maturity is further improved, and rawore substantially eliminates, and sinter is in high temperature section
During flowing downward, sinter is screened out by mechanical force, fragile part and rawore part, and yield rate is improved,
The traditional cooler of customer service leaks out, and the drawbacks such as higher sintering waste heat resource of recovered temperature change cooler and be only limitted to burn
Knot mine is cooling and is unable to the situation of high efficiente callback sensible heat.
B) provided by the invention based on the sinter waste-heat recovery device for erecting cold kiln, it can sufficiently recycle sinter and sintering
Fume afterheat, while reducing SOxAnd NOxDischarge reduces the discharge amount of dust, protects environment.Since cooling gas is in closed tank body
It is interior that sinter is cooled down, while tank body connects mine using positioning, dust is easy to get to control.By cycle operation, resource it is anti-
Multiple utilization rate improves, and works at the same time efficiency and is also improved, to further increase heat utilization rate.It is short with process, it is applicable in
Property strong, investment, the advantages such as operating cost is low, can be used as enterprise's auxiliary construction of existing sintering desulfuration technique, also may be selected to
Ripe sintering flue gas desulfurization process creates together, has very big application value.
C) provided by the invention based on the sinter waste-heat recovery device for erecting cold kiln, for C sections of flue gases, the low NO of high temperatureXIt is low
SO2, C sections of flue gases are passed through high temperature section, since the temperature of high temperature section top sinter is at 700 DEG C or so, the C section after heat exchange
The temperature of flue gas can reach 680 DEG C or so, hence it is evident that it is higher than the prior art, it further can be effectively by waste heat recovery unit
Recycle the waste heat of C sections of flue gases and high temperature section sinter.For A sections of flue gases and B sections of flue gases, by B sections of flue gas recirculations to A sections of flues pair
The sintering machine partial answered, so that B sections of flue gases and A sections of flue gas in flue mixing, so that SO2Mixing, enrichment, obtain mixed A
Section flue gas, for mixed A sections of flue-gas temperature at 100 DEG C or so, this temperature is suitable for desulfurization, therefore, can directly carry out flue gas
Desulfurization process；A section flue gas by desulfurization process exchanges heat with low-temperature zone, and temperature can rise to 350 DEG C or so, this temperature is suitble to
In SCR denitration, therefore, denitrating flue gas processing can be directly carried out.Waste-heat recovery device of the invention, by by flue and erect it is cold
Kiln segmentation, has not recycled the sensible heat of C the section flue gas and high temperature section sinter of high temperature only effectively, additionally it is possible to so that mixed A
Section flue gas directly reaches the suitable temperature of desulfurization and SCR denitration, does not need additional combustor.
Other features and advantages of the present invention will illustrate in the following description, also, part becomes from specification
It is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by written specification
It is achieved and obtained with structure specifically noted in claims.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is the structural schematic diagram of sinter waste-heat recovery device of the invention；
Fig. 2 is the schematic diagram that sinter waste-heat recovery device of the invention erects gas-solid heat exchange in cold kiln；
Fig. 3 is the SO of each section of flue gas2Concentration, NOxThe curve graph of concentration and temperature.
Appended drawing reference:
1- sintering machine；2- bellows；3-A sections of flues；4-B sections of flues；5-C sections of flues；6- hot precipitator；7- air-introduced machine；
8- high temperature section；The first gravitational precipitator of 9-；10-C sections of UTILIZATION OF VESIDUAL HEAT IN units；11- chimney；12- circulating flue gas cover；The broken sieve of 13-；
14- electrostatic precipitator；The second gravitational precipitator of 15-；16- desulfurization unit；17- low-temperature zone；18-A sections of UTILIZATION OF VESIDUAL HEAT IN units；19-
SCR denitration unit.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention.
On the one hand, the present invention provides a kind of based on the sinter waste-heat recovery device for erecting cold kiln, referring to Fig. 1 to Fig. 3, packet
It includes sequentially connected sintering machine 1, bellows 2, flue and erects cold kiln；Along 1 traffic direction of sintering machine, flue is divided into A sections of flues 3, B sections
Flue 4 and C sections of flues 5；Along cold kiln direction from top to bottom is erected, erects cold kiln and be divided into high temperature section 8 and low-temperature zone 17；A sections of flues 3 go out
Mouth is successively connect with desulfurization unit 16, low-temperature zone 17, SCR denitration unit 19 and chimney 11, and the outlet flue of B sections of flues 4 passes through
The smoke inlet of 1 part of the sintering machine corresponding with A sections of flues 3 of circulating flue gas cover 12 connects, and the flue gas recirculation in B sections of flues 4 is to A sections
The corresponding sintering machine partial of flue 3, the outlet flue of C sections of flues 5 is successively with high temperature section 8, C sections of UTILIZATION OF VESIDUAL HEAT IN units 10 (for example, remaining
Thermal electric generator etc.) and the connection of chimney 11；The flue gas SO of B sections of flues 42The flue gas SO of C sections of flues 5 of concentration >2A sections of cigarettes of concentration >
The flue gas SO in road 32Concentration；The flue gas NO of A sections of flues 3XThe flue gas NO of B sections of flues 4 of concentration >XThe flue gas of C sections of flues 5 of concentration >
NOXConcentration, that is to say, that the flue gas of A sections of flues 3 is the high NO of low temperatureXLow SO2, the flue gas of B sections of flues 4 is NO in medium temperatureXHigh SO2,
The flue gas of C sections of flues 5 is the low NO of high temperatureXLow SO2。
It is understood that the temperature of sinter gradually rises along 1 traffic direction of sintering machine, and therefore, the temperature of flue gas
It gradually rises, the flue-gas temperature of the A sections of flues 3 of flue-gas temperature > of B sections of flues 4 of flue-gas temperature > of C sections of flues 5.
When implementation, by B sections of flue gas recirculations to A sections of corresponding 1 parts of sintering machine of flue 3, so that B sections of flue gases and A sections of flues 3
Corresponding sintering machine partial bed of material reaction, so that SO2Mixing, enrichment, A sections of flue gases remove SO by desulfurization unit 162, then, will
A sections of flue gases exchange heat with 17 sinter of low-temperature zone for erecting cold kiln, so that A sections of flue-gas temperatures rise to the suitable temperature of SCR denitration,
Carry out denitration；C sections of flue gases are exchanged heat with 8 sinter of high temperature section for erecting cold kiln, obtain high-temperature flue gas, are recycled using waste heat single
Member carries out waste heat recycling.
It should be noted that it is the completely new sinter cooling of one kind and waste heat reclaiming process that sinter, which erects cold kiln cooling technology,
Technology, the process of the technique are as follows: the broken sinter of heat is packed into from top and is erected in cold kiln, and with blast from erecting cold kiln lower part
Cooling air carry out reverse heat exchange；While cooling sinter, own temperature gradually rises cooling wind, reach erect it is cold
After the charge level of kiln top, temperature can reach 380 DEG C~450 DEG C or so, become high-temperature hot-air.
Compared with prior art, provided by the invention based on the sinter waste-heat recovery device for erecting cold kiln, flue is divided into A sections
Flue 3, B section flue 4 and C sections of flues 5, erect cold kiln and are divided into high temperature section 8 and low-temperature zone 17, and effectively the flue gas after heat exchanging carries out
Waste heat recovery rate can be improved 50% or more, and waste heat recovery total greatly improves, to the maximum extent recovered flue gas and sintering mine sensible heat
(most recycling).For flue gas quality, the C section flue gas and high temperature section 8 of high temperature exchange heat, and high-temperature flue gas are obtained, after mixing
A section flue gas and low-temperature zone 17 exchange heat, obtain medium temperature flue gas, improve carry sintering mine sensible heat flue gas quality, taken tradition
Cooler produces the drawbacks of lower steam quality and instability of flow, is that subsequent production steam quality generates electricity from ton sinter is improved
Amount is laid a good foundation.Meanwhile for the quality of sinter, heat sinter has insulation effect in high temperature section 8, carries out temperature
Homogenization and remaining fugitive constituent precipitation process, thus pass through high temperature section 8, sinter maturity is further improved, rawore
It substantially eliminates, for sinter during high temperature section 8 flows downward, sinter is by mechanical force, fragile part and rawore part
It is screened out, yield rate is improved, and the traditional cooler of customer service leaks out, the disadvantages such as higher sintering waste heat resource of recovered temperature
End changes the situation that cooler is only limitted to sinter cooling and is unable to high efficiente callback sensible heat.
In addition, above-mentioned waste-heat recovery device can sufficiently recycle sinter and sintering flue gas waste heat, while reducing SOxAnd NOx
Discharge reduces the discharge amount of dust, protects environment.Since cooling gas cools down sinter in vapor tight tank body, simultaneously
Tank body connects mine using positioning, and dust is easy to get to control.By cycle operation, resource recycles rate raising, works at the same time effect
Rate is also improved, to further increase heat utilization rate.Short with process, strong applicability, investment, operating cost are low etc. excellent
Point can be used as enterprise's auxiliary construction of existing sintering desulfuration technique, and mature sintering flue gas desulfurization process also may be selected together
It is newly-built, there is very big application value.
Specifically, if by flue and not erecting cold kiln and being segmented, flue gas directly with erect cold kiln overall heat exchange, obtained cigarette
Temperature degree can only reach 380 DEG C~450 DEG C or so, and for C sections of flue gases, the low NO of high temperatureXLow SO2, C sections of flue gases are passed through high temperature
Section 8, since the temperature of 8 top sinter of high temperature section is at 700 DEG C or so, the temperature of the C section flue gas after heat exchange can reach
680 DEG C or so, hence it is evident that be higher than the prior art, C sections of flue gases and high temperature can effectively further be recycled by waste heat recovery unit
The waste heat of 8 sinters of section.For A sections of flue gases and B sections of flue gases, by B sections of flue gas recirculations to A sections of 3 corresponding sintering machines 1 of flue
Point, so that flue gas mixes in B sections of flue gases and A sections of flues 3, so that SO2Mixing, enrichment, obtain mixed A sections of flue gas, mix
For A section flue-gas temperature afterwards at 100 DEG C or so, this temperature is suitable for desulfurization, therefore, can directly carry out flue gas desulfurization processing；Through
The A section flue gas for crossing desulfurization process exchanges heat with low-temperature zone 17, and temperature can rise to 350 DEG C or so, this temperature is suitable for SCR denitration,
Therefore, denitrating flue gas processing can directly be carried out.Waste-heat recovery device of the invention, by the way that flue to be segmented with cold kiln is erected, no
The sensible heat of 8 sinter of C section flue gas and high temperature section of high temperature is only effectively recycled, additionally it is possible to so that mixed A sections of flue gas is straight
The suitable temperature for accessing desulfurization and SCR denitration does not need additional combustor.
For the segmented mode of flue, specifically, A sections of flues 3, B sections of flues 4 bellows number corresponding with C sections of flues 5
Ratio be 14~16:5~9:4~6.Illustratively, the total number of existing sintering machine wind box 2 is usually at 27 or so (1~27
Number bellows), that is to say, that the A sections of corresponding bellows numbers of flue 3 can be 15, and B sections of corresponding bellows numbers of flue 4 can be with
It is 6, the C sections of corresponding bellows numbers of flue 5 can be 6, that is to say, that the A sections of corresponding bellows of flue 3 are 1~No. 15, B
The section corresponding bellows of flue 4 are 16~No. 21, and the C sections of corresponding bellows of flue 5 are 22~No. 27.
In order to enable flue gas sufficiently to exchange heat with sinter, the smoke inlet of high temperature section 8 is set to the lower part of high temperature section 8, out
Mouth is set to the top of high temperature section 8；Similarly, the smoke inlet of low-temperature zone 17 is set to the lower part of low-temperature zone 17, and outlet flue is set
It is placed in the top of low-temperature zone 17.
After making the section flue gas of the A after desulfurization and low-temperature zone 17 exchange heat, temperature can reach the temperature of suitable SCR denitration
(350 DEG C or so), at the outlet flue of low-temperature zone 17, the temperature of sinter should be controlled in the range of 400 DEG C~450 DEG C, this
Sample can make the temperature of A sections of flue gases directly reach after the sinter of A section flue gas and low-temperature zone 17 after desulfurization is exchanged heat
To the temperature of suitable SCR denitration, without combustor or temperature reducing unit is additionally arranged, thus it is energy saving, simplify above-mentioned waste heat
The structure of recyclable device.
It is understood that in order to which the flue gas for generating sintering machine 1 enters bellows 2 and related pipeline, A sections of flues
3 are equipped with air-introduced machine 7 on the connecting line of desulfurization unit 16 and on C sections of flues 5 and the connecting line of high temperature section 8.Pass through
The flue gas that sintering machine 1 generates can be introduced bellows 2, and be further introduced into the corresponding flue of each section of bellows 2 by air-introduced machine 7, thus
Realize the flowing and processing of flue gas.
In order to avoid the dust in A sections of flue gases and C sections of flue gases blocks up air-introduced machine 7, can be set before the air inlet of air-introduced machine 7
Air-introduced machine deduster (for example, hot precipitator 6 or electrostatic precipitator 14).
In view of flue gas is after erecting cold kiln, the sinter in cold kiln is erected under the action of waste heat, still can generate dust,
It enters in flue gas, it, can be in high temperature section 8 and C sections of waste heat benefits in order to avoid this subsequent equipment of part dust pollution and atmosphere
Cold kiln deduster is erected with setting on the connecting line of unit 10 and on the connecting line of low-temperature zone 17 and SCR denitration unit 19
(for example, the first gravitational precipitator 9 and second gravitational precipitator 15) removes the cigarette after erecting cold kiln by erecting cold kiln deduster
Dust in gas.
In order to further increase the heat recovery rate of above-mentioned apparatus, in the connection of SCR denitration unit 19 and chimney 11
A sections of UTILIZATION OF VESIDUAL HEAT IN units 18 can be set on pipeline.This is because A sections of flue gases are after denitration, temperature be can still be maintained
350 DEG C or so, the A section obvious heat of smoke after denitration is recycled by A sections of UTILIZATION OF VESIDUAL HEAT IN units 18, improves the waste heat of above-mentioned apparatus
Recovery utilization rate.
It is understood that above-mentioned apparatus further includes broken sieve 13 in order to enable sinter to fall into high temperature section 8, burn
Sinter in knot machine 1 is fallen into high temperature section 8 by broken sieve 13.
On the other hand, the present invention also provides a kind of based on the sinter exhaust heat recovering method for erecting cold kiln, using above-mentioned base
In the sinter waste heat apparatus for erecting cold kiln, include the following steps:
Raw materials for sintering (for example, iron ore, fuel, flux, return mine and return to material etc.) is sent into sintering machine to be sintered, it is raw
Flue gas is generated while producing sintering finished ores；B sections of flue gas recirculations are to the corresponding sintering machine partial of A sections of flues；A sections of flue gases are by de-
Sulphur unit desulfurization, the flue gas after desulfurization exchanges heat with the low-temperature zone sinter for erecting cold kiln, so that mixed flue-gas temperature liter
To the suitable temperature of SCR denitration, denitration is carried out；C sections of flue gases are exchanged heat with the high temperature section sinter for erecting cold kiln, obtain high temperature
Flue gas carries out waste heat recycling using waste heat recovery unit.
Compared with prior art, the beneficial effect provided by the invention based on the sinter exhaust heat recovering method for erecting cold kiln with
The above-mentioned beneficial effect based on the sinter waste-heat recovery device for erecting cold kiln is essentially identical, will not repeat them here.
Embodiment one
With certain steel 210m2For sintering machine, totally 27 bellows, flue gas concentration are shown in Table 1.
1-15 sintering bellows flue gas is mixed into A sections of flues, 16-21 sintering bellows flue gas is mixed into B sections of flues,
22-27 sintering bellows flue gas is mixed into C sections of flues 5, A sections of 210,000 Nm of flue gas tolerance3/ h, 77 DEG C of temperature, SO2Concentration
506mg/Nm3, NOxConcentration 245mg/Nm3；B sections of 130,000 Nm of flue gas tolerance3/ h, 178 DEG C of temperature, SO2Concentration 2018mg/Nm3,
NOxConcentration 103mg/Nm3；C sections of 170,000 Nm of flue gas tolerance3/ h, 318 DEG C of temperature, SO2Concentration 1447mg/Nm3, NOxConcentration
15mg/Nm3。
C sections of flue gases are passed through high temperature section, exchanges heat with heat sinter, 700 DEG C of sinter temperature, high-temperature flue gas is obtained after heat exchange
About 680 DEG C of temperature, high-temperature flue gas waste heat is recycled using waste heat boiler；It is recycled to sintering machine leading portion by B sections, makes full use of sintering cigarette
Temperature degree, while by SO2Enrichment；By A sections after dedusting, desulfurization, it is passed through low-temperature zone, 400 DEG C of sinter temperature, is obtained after heat exchange
About 350 DEG C of medium temperature flue-gas temperature, utilize waste heat boiler Mist heat recovering.
The recycling of sintering flue gas waste heat is divided into high-quality (680 DEG C) and low-quality (300 DEG C), it is wider using range.
1 flue gas concentration table of table
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that including sequentially connected sintering machine, wind
Case, flue and erect cold kiln；Along sintering machine traffic direction, the flue is divided into A sections of flues, B sections of flues and C sections of flues；It is cold along erecting
Kiln direction from top to bottom, it is described to erect cold kiln and be divided into high temperature section and low-temperature zone；
The outlet flue of the A sections of flue is successively connect with desulfurization unit, low-temperature zone, SCR denitration unit and chimney, the B sections of cigarette
Flue gas recirculation in road to the corresponding sintering machine partial of A sections of flues, the outlet flue of the C sections of flue successively with high temperature section, more than C sections
Heat utilization unit is connected with chimney；
The flue gas SO of the B sections of flue2The flue gas SO of C sections of flues of concentration >2The flue gas SO of A sections of flues of concentration >2Concentration；A sections of cigarettes
The flue gas NO in roadXThe flue gas NO of B sections of flues of concentration >XThe flue gas NO of C sections of flues of concentration >XConcentration.
2. according to claim 1 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that the A sections of cigarette
Road, B section flue and the ratio of the corresponding bellows number of C sections of flues are 14~16:5~9:4~6.
3. according to claim 1 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that the low-temperature zone
Outlet flue at, the temperature of sinter is 400 DEG C~450 DEG C.
4. according to claim 1 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that the high temperature section
Smoke inlet be set to the lower part of high temperature section, outlet flue is set to the top of high temperature section；The smoke inlet of the low-temperature zone is set to
The lower part of low-temperature zone, outlet flue are set to the top of low-temperature zone.
5. according to claim 1 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that the A sections of cigarette
Air-introduced machine is equipped on the connecting line of road and desulfurization unit and on C sections of flue and the connecting line of high temperature section.
6. according to claim 5 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that the air-introduced machine
Air inlet before be equipped with air-introduced machine deduster.
7. according to claim 1 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that the high temperature section
With on the connecting line of C sections of UTILIZATION OF VESIDUAL HEAT IN units and low-temperature zone with setting on the connecting line of SCR denitration unit is erected cold kiln and removed
Dirt device.
8. according to claim 1 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that the SCR is de-
The connecting pipe of nitre unit and chimney is equipped with A sections of UTILIZATION OF VESIDUAL HEAT IN units.
9. according to claim 1 to described in 8 based on the sinter waste-heat recovery device for erecting cold kiln, which is characterized in that further include
Broken to sieve, the sinter in the sintering machine is fallen into high temperature section by broken sieve.
10. a kind of based on the sinter exhaust heat recovering method for erecting cold kiln, which is characterized in that using such as any one of claim 1 to 9
It is described based on the sinter waste heat apparatus for erecting cold kiln, described method includes following steps:
Raw materials for sintering feeding sintering machine is sintered, generates flue gas while producing sintering finished ores；B sections of flue gas recirculations are to A
The corresponding sintering machine partial of section flue；A sections of flue gases pass through desulfurization unit desulfurization, and the flue gas after desulfurization is burnt with the low-temperature zone for erecting cold kiln
Knot mine exchanges heat, so that mixed flue-gas temperature rises to the suitable temperature of SCR denitration, carries out denitration；By C sections of flue gases and erect
The high temperature section sinter of cold kiln exchanges heat, and obtains high-temperature flue gas, carries out waste heat recycling using waste heat recovery unit.
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| CN109028986A (en) * | 2018-08-24 | 2018-12-18 | 钢研晟华科技股份有限公司 | The sintering mine sensible heat and sintering flue gas waste heat comprehensive utilization system of continuous pallettype sintering machine |
| CN110538560A (en) * | 2019-09-24 | 2019-12-06 | 北京中航泰达环保科技股份有限公司 | System and method for circularly combining desulfurization and ozone preoxidation denitration by using sintering flue gas |
| CN111678350A (en) * | 2020-06-03 | 2020-09-18 | 首钢集团有限公司 | Sintering flue gas cooling sinter system |
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