CN109443002B - Iron ore sintering method for replacing coke by biomass charcoal based on fuel stratification and flue gas circulation - Google Patents
Iron ore sintering method for replacing coke by biomass charcoal based on fuel stratification and flue gas circulation Download PDFInfo
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- CN109443002B CN109443002B CN201811331593.4A CN201811331593A CN109443002B CN 109443002 B CN109443002 B CN 109443002B CN 201811331593 A CN201811331593 A CN 201811331593A CN 109443002 B CN109443002 B CN 109443002B
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- 238000005245 sintering Methods 0.000 title claims abstract description 196
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 239000003546 flue gas Substances 0.000 title claims abstract description 79
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000000571 coke Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000002028 Biomass Substances 0.000 title claims abstract description 42
- 239000003610 charcoal Substances 0.000 title claims abstract description 36
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 29
- 239000000446 fuel Substances 0.000 title claims abstract description 20
- 238000013517 stratification Methods 0.000 title claims abstract description 11
- 238000004321 preservation Methods 0.000 claims abstract description 106
- 238000001816 cooling Methods 0.000 claims abstract description 40
- 239000000428 dust Substances 0.000 claims abstract description 36
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 18
- 230000023556 desulfurization Effects 0.000 claims abstract description 18
- 239000003500 flue dust Substances 0.000 claims abstract description 15
- 239000002912 waste gas Substances 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 79
- 239000000463 material Substances 0.000 claims description 40
- 229910052799 carbon Inorganic materials 0.000 claims description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 32
- 239000010902 straw Substances 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 239000000779 smoke Substances 0.000 abstract description 59
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 239000002803 fossil fuel Substances 0.000 abstract description 3
- 208000008918 voyeurism Diseases 0.000 description 15
- 238000005192 partition Methods 0.000 description 14
- 238000009413 insulation Methods 0.000 description 9
- 238000012423 maintenance Methods 0.000 description 8
- 239000000498 cooling water Substances 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 244000144985 peep Species 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
-
- 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
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements
-
- 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
-
- 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
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
-
- 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
- F27D19/00—Arrangements of controlling devices
-
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/10—Charging directly from hoppers or shoots
-
- 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
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0033—Heating elements or systems using burners
-
- 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
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
- F27D2019/004—Fuel quantity
Abstract
The invention relates to an iron ore sintering device and method for replacing coke by biomass charcoal based on fuel stratification and flue gas circulation, and belongs to the technical field of steel industry. The iron ore sintering device for replacing coke with biomass charcoal based on fuel layering and smoke circulation comprises a sintering machine body, a mixing trough, a ignition furnace, a heat preservation furnace, an air box, a mixed smoke circulation pipeline, a mixed smoke circulation fan, a mixed smoke dust removal device, a sinter cooling waste gas pipeline, a circulation smoke pipeline, a sintering trolley, a large flue dust removal and desulfurization device, a large flue fan, a chimney and a sintering furnace. The device and the method can adopt biomass charcoal to replace coke, can realize the reduction of fossil fuel consumption, the utilization of residual heat of flue gas and SO in the flue gas 2 Is rich and the smoke emission is reduced.
Description
Technical Field
The invention relates to an iron ore sintering device and method for replacing coke by biomass charcoal based on fuel stratification and flue gas circulation, and belongs to the technical field of steel industry.
Background
In recent years, the steel industry in China develops rapidly, the yield is larger than the total yield in the world, but the average energy consumption and the average discharge water in the steel production process are higher than the average level in the world by more than 19 percent. The iron ore sintering process has the advantages of second energy consumption and first discharge in the production process of iron and steel enterprises in China, and has great potential for energy conservation and emission reduction. In addition, with the exhaustion of global fossil energy, the call for using renewable energy to replace fossil energy is increasingly rising, and further development and use of renewable energy have become important ways to alleviate the energy crisis in the world, and are gradually paid attention to by various countries. The method has the advantages that the method has rich biomass resources in China, the biomass carbon is used as renewable energy, and the biomass carbon is adopted to partially replace coke or anthracite during iron ore sintering, so that the method has the advantages of saving sintering cost, reducing carbon emission and inhibiting global warming.
The invention patent with application number 2014106743686 is named as an iron ore low-carbon sintering method. The invention directly concentrates the sintering flue gas to a large flue by each bellows uniformly, and discharges the flue gas after dust removal and desulfurization treatment, and the flue gas has large flow and low SO 2 The desulfurization efficiency of the concentrated sintering flue gas is low and the system load is large.
The invention patent with application number 201510305331.0 is named as a flue gas circulating pre-reduction sintering process and device. The fuel used in the invention is still primary energy-coke, and the fuel in the whole sinter bed is uniformly arranged, so that adverse effects of underburning of the upper bed, overburning of the lower bed and overlarge return rate are caused due to the heat storage characteristic of the sinter bed, and the production and quality of sinter are reduced.
Disclosure of Invention
Aiming at the problems and the defects existing in the prior art, the invention provides biomass charcoal based on fuel layering and smoke circulationAn iron ore sintering device and method for replacing coke. The device and the method can adopt biomass charcoal to replace coke, can realize the reduction of fossil fuel consumption, the utilization of residual heat of flue gas and SO in the flue gas 2 Is rich and the smoke emission is reduced. The invention is realized by the following technical scheme:
the utility model provides an iron ore sintering device based on fuel layering and flue gas circulation's living beings charcoal replaces coke, including the sintering machine fuselage, mixing tank 1, ignition furnace 2, holding furnace 3, bellows 4, mixing flue gas circulation pipeline 5, mixing flue gas circulation fan 6, mixing flue gas dust collector 7, sinter cooling exhaust gas pipeline 8, circulation flue gas pipeline 9, the sintering platform truck 10, big flue 11, big flue dust removal desulfurization device 12, big flue fan 13, chimney 14 and sintering furnace, mixing tank 1 sintering material export is passed through to sintering machine fuselage one end top, the sintering machine fuselage is located mixing tank 1 one end and is equipped with ignition furnace 2 in proper order, holding furnace 3 and sintering furnace, sintering machine fuselage bottom is equipped with sintering platform truck 10, the sintering machine fuselage is with all be equipped with bellows 4 in the sintering machine fuselage length 3/4 that is located mixing tank 1 this end and is the starting, bellows 4 are connected with big flue 11 in proper order, big flue dust removal desulfurization device 12, big flue fan 13 and chimney 14, the circulation flue gas fan 13 and the sintering machine fuselage bottom the remaining part is connected with mixing dust collector 7 through mixing flue gas dust collector 7 entry and mixing flue gas dust collector cooling pipeline 7 cooling pipeline 8, mixing flue gas circulation fan 7 is connected with mixing flue gas dust collector 6 through mixing flue gas circulation fan 6 portion of mixing flue gas dust collector bottom.
The ignition furnace 2 comprises an ignition furnace gas pipe 2-1, an ignition furnace air pipe 2-2, an ignition furnace gas flow control valve 2-3, an ignition furnace air flow control valve 2-4, a telescopic pipe 2-5, an ignition furnace burner 2-6, a water-cooling heat insulation board 2-7, an ignition furnace overhaul inlet 2-8 and an ignition furnace peeping port 2-9, wherein the water-cooling heat insulation board 2-7 is arranged outside the ignition furnace 2, a plurality of ignition furnace burners 2-6 are uniformly inserted into the top of the ignition furnace 2, the ignition furnace burners 2-6 are respectively communicated with the ignition furnace gas pipe 2-1 and the ignition furnace air pipe 2-2, the ignition furnace gas pipe 2-1 and the ignition furnace air pipe 2-2 are respectively provided with the ignition furnace gas flow control valve 2-3 and the ignition furnace air flow control valve 2-4, the ignition furnace air pipe 2-2 is composed of the telescopic pipe 2-5, and the ignition furnace overhaul inlet 2-8 and the ignition furnace peeping port 2-9 are respectively arranged on a furnace body of the ignition furnace 2.
The heat preservation stove 3 comprises a gas pipe 3-1 for the heat preservation stove, a gas flow control valve 3-2 for the heat preservation stove, an air pipe 3-3 for the heat preservation stove, an air flow control valve 3-4 for the heat preservation stove, a burner 3-5 for the heat preservation stove, a maintenance inlet 3-6 for the heat preservation stove and a peeping port 3-7 for the heat preservation stove, an ignition heat preservation stove partition wall 15 is arranged at the adjacent part of the heat preservation stove 3 and the ignition stove 2, a partition cooling water pipe 16 is arranged in the ignition heat preservation stove partition wall 15, a plurality of evenly distributed burner 3-5 for the heat preservation stove are inserted into the top of the heat preservation stove 3, the burner 3-5 for the heat preservation stove is respectively connected with the gas pipe 3-1 for the heat preservation stove and the air pipe 3-3 for the heat preservation stove, the gas flow control valve 3-2 for the heat preservation stove and the air flow control valve 3-4 for the heat preservation stove are respectively arranged on the gas pipe 3-1 for the heat preservation stove and the air pipe 3-3 for the heat preservation stove, and the maintenance inlet 3-6-7 for the heat preservation stove are respectively arranged on a stove body of the heat preservation stove.
An iron ore sintering method for replacing coke by biomass charcoal based on fuel stratification and flue gas circulation comprises the following steps:
preparing coke in the sintering material from the top of the sintering material layer prepared in the mixing material tank 1 to the position with the depth of less than 30%, and preparing coke and biomass charcoal mixed charcoal in the sintering material from the rest depth to 95%; control temperature in sintering machine body with circulating flue gas pipeline 9 is higher than 473K and SO 2 The sintering flue gas with the content of less than 350ppm is extracted through a circulating flue gas pipeline 9 and mixed with high-temperature gas generated in the sintering ore cooling process in a sintering ore cooling waste gas pipeline 8 to obtain mixed gas which is used for circulating sintering and is introduced into the top of a sintering furnace with the temperature of less than 345K.
The total addition amount of the coke and biomass charcoal mixed charcoal is 4% of the mass of the sintering material with the residual depth of 95%, wherein the biomass charcoal accounts for 10-30% of the mass of the mixed charcoal, and the coke accounts for 70-90% of the mass of the mixed charcoal.
The biomass charcoal is charcoal made of shells, straws or woodiness.
The high-temperature gas generated in the sinter cooling process comprises the following gases in volume fraction: CO-0%, CO 2 -0%、SO 2 -0ppm、O 2 -20.9%、H 2 O-0%; the mixed gas comprises the following gases in percentage by volume: CO 2 ≤5%、SO 2 ≤400ppm、O 2 ≥18%、H 2 O≤2%、CO≤2%。
The beneficial effects of the invention are as follows:
1. the device and the method can improve the highest temperature of the upper region of the material layer and the stability of the highest temperature in the depth direction of the material layer, so that the temperature distribution of the material layer is more reasonable; and the adverse effects of upper underburn, lower overburn and excessive return ore rate in the iron ore sintering process can be reduced, and the improvement of the sintering mineral products and the quality is facilitated.
2. The device and the method of the invention can realize SO in the flue gas because the sintering flue gas with the characteristics of high temperature and low sulfur at the rear section of the sintering machine is extracted and mixed with the cooling waste gas for cyclic sintering 2 Improves the flue gas desulfurization efficiency, reduces the requirements on flue gas treatment equipment and reduces the pollution to the environment.
3. The device and the method can reduce the consumption of fossil fuel and the production cost of iron ore sintering due to the utilization of biomass charcoal to partially replace coke.
Drawings
FIG. 1 is a schematic view of the structure of the device of the present invention;
FIG. 2 is a schematic view of the ignition furnace and the heat preservation furnace according to the invention;
FIG. 3 is a schematic diagram of a fuel layering arrangement of example 1 of the present invention.
In the figure: 1-mixing trough, 2-ignition furnace, 3-heat preservation furnace, 4-bellows, 5-mixed flue gas circulation pipeline, 6-mixed flue gas circulation fan, 7-mixed flue gas dust collector, 8-sinter cooling exhaust gas pipeline, 9-circulation flue gas pipeline, 10-sintering trolley, 11-large flue, 12-large flue dust removal desulfurization device, 13-large flue fan, 14-chimney, 15-ignition heat preservation furnace partition wall, 16-partition cooling water pipe, 2-1-ignition furnace gas pipe, 2-2-ignition furnace air pipe, 2-3-ignition furnace gas flow control valve, 2-4-ignition furnace air flow control valve, 2-5-telescopic pipe, 2-6-ignition furnace burner, 2-7-water cooling heat insulation board, 2-8-ignition furnace overhaul inlet, 2-9-ignition furnace peep hole, 3-1-heat preservation furnace gas pipe, 3-2-heat preservation furnace gas flow control valve, 3-3-heat preservation furnace air pipe, 3-4-ignition furnace air flow control valve, 3-5-heat preservation furnace burner, 3-6-heat preservation furnace overhaul inlet, 3-7-heat preservation furnace overhaul inlet.
Detailed Description
The invention will be further described with reference to the drawings and detailed description.
Example 1
The iron ore sintering device for replacing coke by biomass charcoal based on fuel layering and smoke circulation comprises a sintering machine body, a mixing trough 1, an ignition furnace 2, a heat preservation furnace 3, a bellows 4, a mixed smoke circulation pipeline 5, a mixed smoke circulation fan 6, a mixed smoke dust removal device 7, a sinter cooling exhaust gas pipeline 8, a circulating smoke pipeline 9, a sintering trolley 10, a large smoke flue 11, a large smoke flue dust removal and desulfurization device 12, a large smoke flue fan 13, a chimney 14 and a sintering furnace, wherein the top of one end of the sintering machine body is connected with a sintering material outlet of the mixing trough 1 through a distributing machine, the sintering machine body is sequentially provided with the ignition furnace 2, the heat preservation furnace 3 and the sintering furnace from one end of the mixing trough 1, the sintering trolley 10 is arranged at the bottom of the sintering machine body, the sintering machine body is sequentially provided with the bellows 4 in the length 3/4 of the sintering machine body from one end of the mixing trough 1, the bellows 4 is sequentially connected with the large smoke flue 11, the large smoke flue dust removal and desulfurization device 12, the large smoke flue fan 13 and the chimney 14, the rest of the sintering machine body is connected with the mixed smoke dust removal device 7 through the circulating smoke dust removal device 9 at the bottom of the sintering machine body, the mixing smoke dust removal device 7 is also connected with the mixing smoke dust removal device 7 through the circulating smoke dust removal device cooling pipeline 8 and the mixing smoke dust removal device 6.
The ignition furnace 2 comprises an ignition furnace gas pipe 2-1, an ignition furnace air pipe 2-2, an ignition furnace gas flow control valve 2-3, an ignition furnace air flow control valve 2-4, a telescopic pipe 2-5, an ignition furnace burner 2-6, a water-cooling heat insulation board 2-7, an ignition furnace maintenance inlet 2-8 and an ignition furnace peeping port 2-9, wherein the water-cooling heat insulation board 2-7 is arranged outside the ignition furnace 2, a plurality of ignition furnace burners 2-6 are uniformly inserted into the top of the ignition furnace 2, the ignition furnace burners 2-6 are respectively communicated with the ignition furnace gas pipe 2-1 and the ignition furnace air pipe 2-2, the ignition furnace gas pipe 2-1 and the ignition furnace air pipe 2-2 are respectively provided with the ignition furnace gas flow control valve 2-3 and the ignition furnace air flow control valve 2-4, the ignition furnace air pipe 2-2 is composed of the telescopic pipe 2-5, and the ignition furnace maintenance inlet 2-8 and the ignition furnace peeping port 2-9 are respectively arranged on a furnace body of the ignition furnace 2.
The heat preservation furnace 3 comprises a gas pipe 3-1 for the heat preservation furnace, a gas flow control valve 3-2 for the heat preservation furnace, an air pipe 3-3 for the heat preservation furnace, an air flow control valve 3-4 for the heat preservation furnace, a heat preservation furnace burner 3-5, a heat preservation furnace overhaul inlet 3-6 and a heat preservation furnace peeping port 3-7, an ignition heat preservation furnace partition wall 15 is arranged at the position, adjacent to the ignition furnace 2, of the heat preservation furnace 3, a partition wall cooling water pipe 16 is arranged in the ignition heat preservation furnace partition wall 15, a plurality of heat preservation furnace burners 3-5 which are uniformly distributed are inserted into the top of the heat preservation furnace 3, the heat preservation furnace burner 3-5 is respectively connected with the gas pipe 3-1 for the heat preservation furnace and the air pipe 3-3 for the heat preservation furnace, the gas flow control valve 3-2 for the heat preservation furnace and the air pipe 3-4 for the heat preservation furnace are respectively arranged on the gas pipe 3-1 for the heat preservation furnace, and the air flow control valve 3-6 for the heat preservation furnace are respectively arranged on a furnace body of the heat preservation furnace overhaul inlet 3-6 and the heat preservation furnace peeping port 3-7.
The iron ore sintering method for replacing coke by biomass charcoal based on fuel stratification and flue gas circulation comprises the following specific steps:
step 1, the length, width and height (depth) of the mixed material tank 1 are 0.4 multiplied by 0.63m 3 Coke is arranged in the sintering material from 0% to 28% of depth (coke is 4% of the mass of the sintering material from 0% to 28% of depth) on the top of the sintering material layer, mixed carbon of the coke and biomass carbon is arranged in the sintering material from 28% to 95% of depth, wherein the total addition amount of the mixed carbon of the coke and the biomass carbon is 4% of the mass of the sintering material from the residual depth to 95%, the biomass carbon accounts for 20% of the mass of the mixed carbon, the coke accounts for 80% of the mass of the mixed carbon, the biomass carbon is carbon made of wood, and the residual depth is 95% to 100% of the iron ore base material layer;
step 2, adding the sintering material in the mixing trough 1 onto a sintering machine trolley in a sintering machine body by a distributor, igniting by an ignition furnace 2, preserving heat by a heat preserving furnace 3, sintering in the sintering furnace, and finally, obtaining the final productThe flue gas generated in the sintering process of the sintering furnace with the length of the sintering machine body being less than 3/4 is discharged from a chimney 14 through a wind box 4, a large flue 11, a large flue dust removal desulfurization device 12 and a large flue fan 13; controlling the control temperature in the sintering machine body provided with the circulating flue gas pipeline 9 to be higher than 473K and SO 2 The sintering flue gas with the content lower than 350ppm is extracted through a circulating flue gas pipeline 9, and high-temperature gas generated in the sintering ore cooling process in a mixed flue gas dust removal device 7 and a sintering ore cooling waste gas pipeline 8 (the high-temperature gas generated in the sintering ore cooling process comprises the following gases with volume fractions of CO-0% and CO) 2 -0%、SO 2 -0ppm、O 2 -20.9%、H 2 O-0%) to obtain a mixed gas (the mixed gas comprises the following gases by volume percent: CO 2 ≤5%、SO 2 ≤400ppm、O 2 ≥18%、H 2 O is less than or equal to 2 percent, CO is less than or equal to 2 percent, the temperature is 1129K), and the mixed flue gas is used for circulating sintering and is introduced into the top of a sintering furnace with the temperature lower than 345K in the sintering furnace through a mixed flue gas circulating pipeline 5 and a mixed flue gas circulating fan 6.
The iron ore sintering method in the embodiment has the advantages that the upper underfiring is 5.3%, the lower overfiring is 4.5% and the return ore rate is 10.3%, compared with the prior art, the method has obvious reduction, and is favorable for improving the sintering mineral products and the quality.
Example 2
The iron ore sintering device for replacing coke by biomass charcoal based on fuel layering and smoke circulation comprises a sintering machine body, a mixing trough 1, an ignition furnace 2, a heat preservation furnace 3, a bellows 4, a mixed smoke circulation pipeline 5, a mixed smoke circulation fan 6, a mixed smoke dust removal device 7, a sinter cooling exhaust gas pipeline 8, a circulating smoke pipeline 9, a sintering trolley 10, a large smoke flue 11, a large smoke flue dust removal and desulfurization device 12, a large smoke flue fan 13, a chimney 14 and a sintering furnace, wherein the top of one end of the sintering machine body is connected with a sintering material outlet of the mixing trough 1 through a distributing machine, the sintering machine body is sequentially provided with the ignition furnace 2, the heat preservation furnace 3 and the sintering furnace from one end of the mixing trough 1, the sintering trolley 10 is arranged at the bottom of the sintering machine body, the sintering machine body is sequentially provided with the bellows 4 in the length 3/4 of the sintering machine body from one end of the mixing trough 1, the bellows 4 is sequentially connected with the large smoke flue 11, the large smoke flue dust removal and desulfurization device 12, the large smoke flue fan 13 and the chimney 14, the rest of the sintering machine body is connected with the mixed smoke dust removal device 7 through the circulating smoke dust removal device 9 at the bottom of the sintering machine body, the mixing smoke dust removal device 7 is also connected with the mixing smoke dust removal device 7 through the circulating smoke dust removal device cooling pipeline 8 and the mixing smoke dust removal device 6.
The ignition furnace 2 comprises an ignition furnace gas pipe 2-1, an ignition furnace air pipe 2-2, an ignition furnace gas flow control valve 2-3, an ignition furnace air flow control valve 2-4, a telescopic pipe 2-5, an ignition furnace burner 2-6, a water-cooling heat insulation board 2-7, an ignition furnace maintenance inlet 2-8 and an ignition furnace peeping port 2-9, wherein the water-cooling heat insulation board 2-7 is arranged outside the ignition furnace 2, a plurality of ignition furnace burners 2-6 are uniformly inserted into the top of the ignition furnace 2, the ignition furnace burners 2-6 are respectively communicated with the ignition furnace gas pipe 2-1 and the ignition furnace air pipe 2-2, the ignition furnace gas pipe 2-1 and the ignition furnace air pipe 2-2 are respectively provided with the ignition furnace gas flow control valve 2-3 and the ignition furnace air flow control valve 2-4, the ignition furnace air pipe 2-2 is composed of the telescopic pipe 2-5, and the ignition furnace maintenance inlet 2-8 and the ignition furnace peeping port 2-9 are respectively arranged on a furnace body of the ignition furnace 2.
The heat preservation furnace 3 comprises a gas pipe 3-1 for the heat preservation furnace, a gas flow control valve 3-2 for the heat preservation furnace, an air pipe 3-3 for the heat preservation furnace, an air flow control valve 3-4 for the heat preservation furnace, a heat preservation furnace burner 3-5, a heat preservation furnace overhaul inlet 3-6 and a heat preservation furnace peeping port 3-7, an ignition heat preservation furnace partition wall 15 is arranged at the position, adjacent to the ignition furnace 2, of the heat preservation furnace 3, a partition wall cooling water pipe 16 is arranged in the ignition heat preservation furnace partition wall 15, a plurality of heat preservation furnace burners 3-5 which are uniformly distributed are inserted into the top of the heat preservation furnace 3, the heat preservation furnace burner 3-5 is respectively connected with the gas pipe 3-1 for the heat preservation furnace and the air pipe 3-3 for the heat preservation furnace, the gas flow control valve 3-2 for the heat preservation furnace and the air pipe 3-4 for the heat preservation furnace are respectively arranged on the gas pipe 3-1 for the heat preservation furnace, and the air flow control valve 3-6 for the heat preservation furnace are respectively arranged on a furnace body of the heat preservation furnace overhaul inlet 3-6 and the heat preservation furnace peeping port 3-7.
The iron ore sintering method for replacing coke by biomass charcoal based on fuel stratification and flue gas circulation comprises the following specific steps:
step 1, mixtureThe length, width and height (depth) of the groove 1 were 0.4X0.4X0.63 m 3 Coke is arranged in the sintering material from 0% to 27% of depth (coke is 4% of the mass of the sintering material from 0% to 27% of depth) on the top of the sintering material layer, mixed carbon of the coke and biomass carbon is arranged in the sintering material from 27% to 95% of depth, wherein the total addition amount of the mixed carbon of the coke and the biomass carbon is 4% of the mass of the sintering material from the residual depth to 95%, the biomass carbon accounts for 10% of the mass of the mixed carbon, the coke accounts for 90% of the mass of the mixed carbon, the biomass carbon is carbon prepared from straws, and the residual depth is 95% to 100% of iron ore base material layer;
step 2, adding the sintering material in the mixing trough 1 onto a sintering machine trolley in a sintering machine body by a distributor, igniting by a ignition furnace 2, preserving heat by a heat preserving furnace 3, sintering in the sintering furnace, and discharging flue gas generated in the sintering process of the sintering furnace within 3/4 of the sintering machine body from a chimney 14 by a wind box 4, a large flue 11, a large flue dust removal and desulfurization device 12 and a large flue fan 13; controlling the control temperature in the sintering machine body provided with the circulating flue gas pipeline 9 to be higher than 473K and SO 2 The sintering flue gas with the content lower than 350ppm is extracted through a circulating flue gas pipeline 9, and high-temperature gas generated in the sintering ore cooling process in a mixed flue gas dust removal device 7 and a sintering ore cooling waste gas pipeline 8 (the high-temperature gas generated in the sintering ore cooling process comprises the following gases with volume fractions of CO-0% and CO) 2 -0%、SO 2 -0ppm、O 2 -20.9%、H 2 O-0%, and the temperature is 1129K) to obtain mixed gas (the mixed gas comprises the following gases by volume percent: CO 2 ≤5%、SO 2 ≤400ppm、O 2 ≥18%、H 2 O is less than or equal to 2 percent and CO is less than or equal to 2 percent) and is used for circularly sintering the top of a sintering furnace with the temperature lower than 345K in the sintering furnace through a mixed flue gas circulating pipeline 5 and a mixed flue gas circulating fan 6.
The iron ore sintering method in the embodiment has the advantages that the upper underfiring is 5.6%, the lower overfiring is 4.6% and the return ore rate is 10.9%, compared with the prior art, the method has obvious reduction, and is favorable for improving the sintering mineral products and the quality.
Example 3
The iron ore sintering device for replacing coke by biomass charcoal based on fuel layering and smoke circulation comprises a sintering machine body, a mixing trough 1, an ignition furnace 2, a heat preservation furnace 3, a bellows 4, a mixed smoke circulation pipeline 5, a mixed smoke circulation fan 6, a mixed smoke dust removal device 7, a sinter cooling exhaust gas pipeline 8, a circulating smoke pipeline 9, a sintering trolley 10, a large smoke flue 11, a large smoke flue dust removal and desulfurization device 12, a large smoke flue fan 13, a chimney 14 and a sintering furnace, wherein the top of one end of the sintering machine body is connected with a sintering material outlet of the mixing trough 1 through a distributing machine, the sintering machine body is sequentially provided with the ignition furnace 2, the heat preservation furnace 3 and the sintering furnace from one end of the mixing trough 1, the sintering trolley 10 is arranged at the bottom of the sintering machine body, the sintering machine body is sequentially provided with the bellows 4 in the length 3/4 of the sintering machine body from one end of the mixing trough 1, the bellows 4 is sequentially connected with the large smoke flue 11, the large smoke flue dust removal and desulfurization device 12, the large smoke flue fan 13 and the chimney 14, the rest of the sintering machine body is connected with the mixed smoke dust removal device 7 through the circulating smoke dust removal device 9 at the bottom of the sintering machine body, the mixing smoke dust removal device 7 is also connected with the mixing smoke dust removal device 7 through the circulating smoke dust removal device cooling pipeline 8 and the mixing smoke dust removal device 6.
The ignition furnace 2 comprises an ignition furnace gas pipe 2-1, an ignition furnace air pipe 2-2, an ignition furnace gas flow control valve 2-3, an ignition furnace air flow control valve 2-4, a telescopic pipe 2-5, an ignition furnace burner 2-6, a water-cooling heat insulation board 2-7, an ignition furnace maintenance inlet 2-8 and an ignition furnace peeping port 2-9, wherein the water-cooling heat insulation board 2-7 is arranged outside the ignition furnace 2, a plurality of ignition furnace burners 2-6 are uniformly inserted into the top of the ignition furnace 2, the ignition furnace burners 2-6 are respectively communicated with the ignition furnace gas pipe 2-1 and the ignition furnace air pipe 2-2, the ignition furnace gas pipe 2-1 and the ignition furnace air pipe 2-2 are respectively provided with the ignition furnace gas flow control valve 2-3 and the ignition furnace air flow control valve 2-4, the ignition furnace air pipe 2-2 is composed of the telescopic pipe 2-5, and the ignition furnace maintenance inlet 2-8 and the ignition furnace peeping port 2-9 are respectively arranged on a furnace body of the ignition furnace 2.
The heat preservation furnace 3 comprises a gas pipe 3-1 for the heat preservation furnace, a gas flow control valve 3-2 for the heat preservation furnace, an air pipe 3-3 for the heat preservation furnace, an air flow control valve 3-4 for the heat preservation furnace, a heat preservation furnace burner 3-5, a heat preservation furnace overhaul inlet 3-6 and a heat preservation furnace peeping port 3-7, an ignition heat preservation furnace partition wall 15 is arranged at the position, adjacent to the ignition furnace 2, of the heat preservation furnace 3, a partition wall cooling water pipe 16 is arranged in the ignition heat preservation furnace partition wall 15, a plurality of heat preservation furnace burners 3-5 which are uniformly distributed are inserted into the top of the heat preservation furnace 3, the heat preservation furnace burner 3-5 is respectively connected with the gas pipe 3-1 for the heat preservation furnace and the air pipe 3-3 for the heat preservation furnace, the gas flow control valve 3-2 for the heat preservation furnace and the air pipe 3-4 for the heat preservation furnace are respectively arranged on the gas pipe 3-1 for the heat preservation furnace, and the air flow control valve 3-6 for the heat preservation furnace are respectively arranged on a furnace body of the heat preservation furnace overhaul inlet 3-6 and the heat preservation furnace peeping port 3-7.
The iron ore sintering method for replacing coke by biomass charcoal based on fuel stratification and flue gas circulation comprises the following specific steps:
step 1, the length, width and height (depth) of the mixed material tank 1 are 0.4 multiplied by 0.63m 3 Coke is arranged in the sintering material from 0% to 29% of depth (coke is 4% of the mass of the sintering material from 0% to 29% of depth) on the top of the sintering material layer, mixed carbon of the coke and biomass carbon is arranged in the sintering material from 29% to 95% of depth, wherein the total addition amount of the mixed carbon of the coke and the biomass carbon is 4% of the mass of the sintering material from the residual depth to 95%, the biomass carbon accounts for 30% of the mass of the mixed carbon, the coke accounts for 70% of the mass of the mixed carbon, the biomass carbon is carbon manufactured by shells, and the residual depth is 95% to 100% of the iron ore bottom material layer;
step 2, adding the sintering material in the mixing trough 1 onto a sintering machine trolley in a sintering machine body by a distributor, igniting by a ignition furnace 2, preserving heat by a heat preserving furnace 3, sintering in the sintering furnace, and discharging flue gas generated in the sintering process of the sintering furnace within 3/4 of the sintering machine body from a chimney 14 by a wind box 4, a large flue 11, a large flue dust removal and desulfurization device 12 and a large flue fan 13; controlling the control temperature in the sintering machine body provided with the circulating flue gas pipeline 9 to be higher than 473K and SO 2 The sintering flue gas with the content lower than 350ppm is extracted through a circulating flue gas pipeline 9, and high-temperature gas generated in the sintering ore cooling process in a mixed flue gas dust removal device 7 and a sintering ore cooling waste gas pipeline 8 (the high-temperature gas generated in the sintering ore cooling process comprises the following gases by volume percentCO 2 -0%、SO 2 -0ppm、O 2 -20.9%、H 2 O-0%, and the temperature is 1129K) to obtain mixed gas (the mixed gas comprises the following gases by volume percent: CO 2 ≤5%、SO 2 ≤400ppm、O 2 ≥18%、H 2 O is less than or equal to 2 percent and CO is less than or equal to 2 percent) and is used for circularly sintering the top of a sintering furnace with the temperature lower than 345K in the sintering furnace through a mixed flue gas circulating pipeline 5 and a mixed flue gas circulating fan 6.
The iron ore sintering method in the embodiment has the advantages that the upper underfiring is 5.2%, the lower overfiring is 4.3% and the return ore rate is 9.8%, compared with the prior art, the method has obvious reduction, and is favorable for improving the sintering mineral products and the quality.
While the present invention has been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (3)
1. The iron ore sintering method for replacing coke by biomass charcoal based on fuel stratification and flue gas circulation is characterized by comprising the following steps of: comprises a sintering machine body, a mixing trough (1), an ignition furnace (2), a heat preservation furnace (3), a wind box (4), a mixed flue gas circulation pipeline (5), a mixed flue gas circulation fan (6), a mixed flue gas dust removal device (7), a sintering machine body cooling waste gas pipeline (8), a circulating flue gas pipeline (9), a sintering trolley (10), a large flue (11), a large flue dust removal and desulfurization device (12), a large flue fan (13), a chimney (14) and a sintering furnace, wherein the top of one end of the sintering machine body is connected with a sintering material outlet of the mixing trough (1) through a distributor, the sintering machine body is arranged at one end of the mixing trough (1) in sequence, the ignition furnace (2), the heat preservation furnace (3) and the sintering furnace are arranged at the bottom of the sintering machine body, the sintering machine body is provided with a sintering trolley (10), the sintering machine body is provided with the wind box (4) within 3/4 of the sintering machine body from the end of the mixing trough (1) as an end point, the wind box (4) is sequentially connected with the large flue (11), the large flue dust removal and desulfurization device (12), the large flue fan (13) and the chimney (14), the rest of the sintering machine body is connected with the mixing furnace cooling waste gas pipeline (7) through the circulating flue gas pipeline (9) at the bottom of the sintering machine body, the sintering machine body is also connected with the mixed flue gas dust removal device (7) cooling waste gas inlet, the outlet of the mixed flue gas dust removal device (7) is communicated with the top of the sintering furnace through a mixed flue gas circulating pipeline (5) and a mixed flue gas circulating fan (6);
extracting sintering flue gas with high-temperature low-sulfur characteristics at the rear section of the sintering machine, mixing the sintering flue gas with cooling waste gas, and then circularly sintering;
preparing coke in the sintering material from the top of the sintering material layer prepared in the mixing trough (1) to the position with the depth less than 30%, and preparing coke and biomass carbon mixed carbon in the sintering material from the residual depth to 95%; sintering flue gas with the temperature higher than 473K and the SO2 content lower than 350ppm in the sintering machine body provided with the circulating flue gas pipeline (9) is extracted through the circulating flue gas pipeline (9), and mixed with high-temperature gas generated in the sintering ore cooling process in the sintering ore cooling waste gas pipeline (8) to obtain mixed gas for circulating sintering and introducing into the top of a sintering furnace with the temperature lower than 345K in the sintering furnace;
the high-temperature gas generated in the sinter cooling process comprises the following gases in volume fraction: CO-0%, CO2-0%, SO2-0ppm, O2-20.9%, H2O-0%; the mixed gas comprises the following gases in percentage by volume: CO2 is less than or equal to 5%, SO2 is less than or equal to 400ppm, O2 is more than or equal to 18%, H2O is less than or equal to 2%, and CO is less than or equal to 2%.
2. The method for sintering the iron ore by replacing coke with biomass charcoal based on fuel stratification and flue gas circulation according to claim 1, characterized in that: the total addition amount of the coke and biomass charcoal mixed charcoal is 4% of the mass of the sintering material with the residual depth of 95%, wherein the biomass charcoal accounts for 10-30% of the mass of the mixed charcoal, and the coke accounts for 70-90% of the mass of the mixed charcoal.
3. The method for sintering the iron ore by replacing coke with biomass charcoal based on fuel stratification and flue gas circulation according to claim 2, characterized in that: the biomass charcoal is charcoal made of shells, straws or woodiness.
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