CN114395655A - Method for reducing energy consumption of Ou metallurgical furnace process - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000005265 energy consumption Methods 0.000 title claims abstract description 36
- 239000003245 coal Substances 0.000 claims abstract description 70
- 239000000463 material Substances 0.000 claims abstract description 31
- 239000006260 foam Substances 0.000 claims abstract description 27
- 239000000446 fuel Substances 0.000 claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000003723 Smelting Methods 0.000 claims abstract description 22
- 238000002309 gasification Methods 0.000 claims abstract description 18
- 238000002347 injection Methods 0.000 claims abstract description 15
- 239000007924 injection Substances 0.000 claims abstract description 15
- 239000008188 pellet Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000010079 rubber tapping Methods 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 5
- 230000007774 longterm Effects 0.000 claims abstract description 4
- 239000000571 coke Substances 0.000 claims description 63
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 47
- 239000003034 coal gas Substances 0.000 claims description 34
- 229910052742 iron Inorganic materials 0.000 claims description 24
- 238000005516 engineering process Methods 0.000 claims description 19
- 238000005272 metallurgy Methods 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 claims description 3
- 230000002401 inhibitory effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 38
- 238000004519 manufacturing process Methods 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 239000000428 dust Substances 0.000 description 6
- 238000001465 metallisation Methods 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 239000002802 bituminous coal Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000008234 soft water Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
- C21B13/023—Making spongy iron or liquid steel, by direct processes in shaft furnaces wherein iron or steel is obtained in a molten state
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
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- Engineering & Computer Science (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention discloses a method for reducing the energy consumption of an Ou metallurgical furnace, which uses acid pellets and high-alkalinity sinter, and obtains a blending structure suitable for the burden structure of a reduction furnace of the Ou metallurgical furnace according to the cost performance and the economy of ore smelting, wherein the blending structure comprises the following steps: 40% of sintered ore, 57% of pellet, 3% of raw ore and 97% of clinker, improves the compressive strength of the pellet, enables the compressive strength to be larger than 2200N, stabilizes the components of the sintered ore, stabilizes the alkalinity of the sintered ore at R =2.4 times, and has MgO: 2.4 percent and the strand rotation is more than 80 percent; the vault coal injection, the coal injection quantity is stabilized to about 150 kg/tHM, the material level of the gasification furnace is stabilized, 25 material levels before tapping are stabilized at 50%, 24 material levels after tapping are not less than 100%, and low material levels or long-term full material levels are avoided; the coke powder is 2500m3The grain size of the discharged coke powder of the blast furnace is 60 percent when the grain size is 5-10mm, the grain size of the foam coal is 5-10mm, the grain size is kept above 50 percent, and the moisture of the coke powder is less than5 percent, the moisture of the foam coal is less than 8 percent; the volatile matter of the foam coal is controlled to be more than 35 percent, the gas generation amount is improved, and the fuel consumption is reduced.
Description
Technical Field
The invention relates to the field of non-blast furnace metallurgy, in particular to a method for reducing the energy consumption of an Ou-metallurgical furnace.
Background
In order to solve the problems of large investment scale and large pollution in the traditional blast furnace ironmaking method, a COREX furnace ironmaking method, namely a smelting reduction ironmaking method, is developed in the world from the seventies of the last century. The ironmaking process uses lump coal and a small amount of low-strength coke directly to feed into a furnace for generating heat for smelting molten iron and reducing coal gas. Currently, the COREX devices being produced in the world have five sets: the first C2000COREX furnace from Korea Ph corporation (Pohang), two C2000COREX furnaces from JINDAL, India, one C2000COREX furnace from SALDANHA, south Africa, and direct reduction shaft furnace from Baobu group, China Steel Euro furnace. The COREX furnace is the most advanced COREX in the world, is transformed from Bao Feijing to eight Fei through a series of process technologies, has the technical characteristics of the process, and is named as the European furnace. The Ou metallurgical furnace is started to be put into production from 6 months to 18 months in 2015, equipment and process technology are continuously innovated on the basis of COREX3000, the process flow is improved, non-blast furnace smelting process equipment with Ou metallurgical furnace process technology and certain competitiveness is formed, and the blank in the non-blast furnace smelting reduction iron-making field is filled. The ton iron consumption standard coal of the process energy consumption of the European and metallurgical furnace is converted according to the general rule of comprehensive energy consumption calculation (GB/T2589-2008), and the total process energy consumption comprises coke, coal, oxygen, coke oven gas, nitrogen, compressed air, steam, fresh water, soft water and power consumption. The recycling items include: the gas of the euler furnace and the TRT generated energy. The energy consumption of the European furnace process is 469 kgce/T ton of iron standard coal, the requirement that the first-grade standard of clean production (international clean production advanced water) (HJ/T427-2008) is less than or equal to 385kgce cannot be met, and the pressure for emission reduction and energy conservation is high.
Disclosure of Invention
The invention aims to provide a method for reducing the energy consumption of an Ou-Meta furnace, which reduces the energy consumption of the Ou-Meta furnace to be lower than the primary standard requirement of clean production of the energy consumption of an iron-making process on the basis of ensuring the stable operation of the Ou-Meta furnace, and achieves the purposes of energy conservation and emission reduction.
A method for reducing energy consumption of an Ou metallurgical furnace process comprises the following implementation steps:
1) the acid pellet ore is matched with the high-alkalinity sinter ore, and according to the cost performance and the economy of ore smelting, the ore blending structure suitable for the burden structure of the reduction furnace of the European smelting furnace is obtained as follows: 40% of sintered ore, 57% of pellet, 3% of raw ore and 97% of clinker, improving the compressive strength of the pellet, enabling the compressive strength to be larger than 2200N, stabilizing the components of the sintered ore, stabilizing the alkalinity of the sintered ore at R =2.4 times, and enabling the ratio of MgO: 2.4 percent and the strand rotation is more than 80 percent;
2) low coke ratio operation structure and fuel size management: the coke ratio is 275kg, and the coke ratio comprises 2500m3The unused 5-25mm coke breeze discharged by the blast furnace is 130 kg/t iron, thereby realizing the complementation of the fuel of the blast furnace and the Europe and metallurgy furnace and consuming a large amount of blast furnaceRemoving coke pieces which cannot be used completely, wherein the coke ratio is high and is 145 kg/t iron; the vault coal injection is carried out, the coal injection quantity stably reaches about 150 Kg/tHM, and the large coke ratio is reduced by 30 Kg/t.HM;
3) stabilizing the material level of the gasification furnace, wherein 25 material levels before tapping are stabilized at 50%, and 24 material levels after tapping are not less than 100%, so that low material levels or long-term full material levels are avoided;
4) stabilizing the material level of the shaft furnace, controlling the radar material level to be between 20 and 20.5m, and avoiding low material level, wherein the coke ratio is 525kg, and 418.43 kgce/t ton iron standard coal is obtained; the pressure of a factory is increased and stabilized at about 310kPa, and the flow rate of coal gas is reduced, so that the coal gas is reduced more fully; the coke powder is 2500m3Discharging coke powder outside the blast furnace, wherein the granularity of 5-10mm is 60%, the granularity of the coal foam is 5-10mm, the granularity is kept above 50%, the moisture of the coke powder is less than 5%, and the moisture of the coal foam is less than 8%;
list of foam coal and coke powder
5) The volatile content of the foam coal is controlled to be more than 35 percent, the gas generation amount is improved, and the gas consumption of the technology of injecting gas through the top gas circulating tuyere is 40Nm3The top coal gas circulation tuyere injecting coal gas of the iron gas is beneficial to reducing the theoretical combustion temperature of the tuyere of the gasification furnace, inhibiting the reduction of Si, stabilizing the furnace condition of the gasification furnace and reducing the fuel consumption.
The method analyzes the influence factors of the process energy consumption: the ton iron consumption standard coal of the process energy consumption of the European and metallurgical furnace is converted according to the general rule of comprehensive energy consumption calculation (GB/T2589-2008), and the process energy consumption comprises coke, coal, oxygen, coke oven gas, nitrogen, compressed air, steam, fresh water, soft water and power consumption. The recycling items include: the gas of the euler furnace and the TRT generated energy. The gas consumption of the Europe and metallurgy furnace is increased due to the recycling of the gas in the fuel consumption. The process energy consumption of the raw fuel in the production process of the Europe and metallurgy furnace accounts for about 90 percent of the total process energy consumption, the key technical condition for improving the cost competitiveness of the Europe and metallurgy furnace and continuously reducing the process energy consumption is to maintain the furnace condition to be smooth and reduce the consumption of the raw fuel. One of the conditions for keeping the operating conditions of the Ou metallurgical furnace smooth is to take account of the economic efficiencyThe method is characterized in that the furnace condition is kept to be smooth, particularly the shaft furnace condition is important, acid pellet ore is matched with high-alkalinity sinter ore according to the existing ore blending resource condition of an eight-steel iron-making plant, and the optimal ore blending structure suitable for the burden structure of a reduction furnace of an European smelting furnace is obtained according to the cost performance and the economy of ore smelting; the compression strength of the pellet is improved, the metallurgical performance of the pellet is improved, and the reduction expansibility is reduced, so that the compression strength is greater than 2200N. The furnace burden structure is reasonable collocation of sintered ore, pellet ore, lump ore and the like according to a certain proportion, and the reasonable furnace burden structure is not only important content of a fine material technology, but also important content of improving fuel consumption and reducing energy consumption. Low coke ratio operation structure and fuel size fraction management: the fuel of the European smelting furnace mainly adopts a production process of coke, foam coal (coke powder) and blowing bituminous coal, the volatile content of the bituminous coal is higher than that of the coke in order to improve the gas generation amount, and meanwhile, the sufficient foam coal and coke powder are ensured to be used under the condition of ensuring the replacement ratio of granular coal and the coke in order to reduce the cost. The Europe and metallurgy furnace has great optimization and promotion space in terms of fuel structure, granularity composition and coke quality. The particle size of the foam coal and the coke powder fed into the gasifier is improved by screening, the foam coal and the coke powder with the particle size larger than 5mm are added into the gasifier to replace part of coke usage, the purpose of reducing the large coke ratio is achieved, meanwhile, the consumption of small particle coal powder after entering the coal gas and being subjected to dust removal and cleaning is reduced, namely, the coal gas quality is improved, the dust removal load is reduced, and the method has great significance for reducing the coal consumption. The operation of the production process is optimized to improve the operation rate, the gasification furnace is finely operated, the working condition of the shaft furnace is stable and smooth, the reasonable distribution of the gas flow of the shaft furnace is adjusted, the high metallization rate is obtained, and the proper metallization rate is obtained by proper unit consumption of the gas on the top of the shaft furnace. And controlling a proper heat system and a slagging system. The stable operation of the coal gas system comprises the stable operation of dry dedusting, the stable operation of a dust line, the stable operation of a pressurizer and the stable operation of washing water of a coal gas process. Reduce equipment faults and improve the operating rate of the Europe smelting furnace by more than 96 percent. Ou ye top gas CO removal2The technology further reduces the fuel consumption and achieves the purpose of reducing the energy consumption of the working procedure; CO removal by Ou Meta top gas2Technology, CO is removed by using Ou metallurgical furnace top gas2Technically, removing top gas by alcohol-amine methodRemoving CO from gas2Less than 1 percent, and the reducing atmosphere of reducing gas is CO + H2The coal gas can be comprehensively utilized to prepare the reducing gas, the potential of the Ou metallurgical furnace top coal gas can be further exerted, the high-efficiency cyclic utilization of the coal gas is realized, and the comprehensive utilization of the Ou metallurgical furnace reducing coal gas is realized. Through technical innovation, an oxygen tuyere coal injection technology is adopted. The coal injection technology of the oxygen tuyere is adopted, and the operation of injecting coal powder to the melting gasification furnace is carried out through the oxygen tuyere of the Ou-Meta furnace. By adopting the oxygen tuyere coal injection technology, the theoretical combustion temperature can be reduced, which not only reduces the molten iron [ Si ]]The content and the temperature of the slag iron reduce the fuel consumption and also reduce the risk of tuyere damage caused by over high radiation thermal shock of a convolution area. Ou Yu Ye Yu Ye technology. The Euler furnace generates gas flow direction, and the energy loss in the whole flow direction is mainly concentrated on the physical heat loss caused by two washing and cooling processes. The first time is that the temperature of the circulating coal gas and the surplus coal gas is reduced to 40 ℃ from 850 ℃ after being washed and cooled; the second time is that the washing cooling temperature of the top gas is reduced from 240 ℃ to 40 ℃. The large physical heat loss caused by the washing and cooling of the coal gas of the two parts is the main reason of the overhigh energy consumption of the work procedure of the European and metallurgical furnaces. Before CO2 is removed, an Ou-Meta furnace gas waste heat recovery technology is adopted, so that not only can the residual chemical heat of the shaft furnace be recycled, but also the problem of coal gas physical heat waste of the gasification furnace can be solved, and the process energy consumption of the Ou-Meta furnace is reduced.
Has the advantages that: as can be seen from the table below, the energy consumption of the process of the European smelting furnace after innovation is 469 kgce/t ton of iron standard coal, the energy consumption of 325.31kgce/t standard coal is produced after technical innovation in 4 months to 2020 months in 2019, the energy media mainly consumed after innovation are coal and coke, the occupation ratio before innovation is 69.41% and 24.24% respectively, and the total occupation ratio of the coal and the coke before innovation is 93.39% of the energy consumption before innovation. The main energy consumption of the coal and the coke produced by the technical innovation is 55.44 percent and 34.62 percent respectively, and the total process energy consumption of the coal and the coke accounts for 90.06 percent of the total energy consumption by the technical innovation. Therefore, the fuel consumption of the European smelting furnace in the process energy consumption of technical innovation is as follows: although the gas consumption of the Europe and metallurgy furnace is increased, the total fuel consumption before innovation is 916.9kgce/t, the total fuel consumption after innovation is 698.04 kgce/t, and the total fuel consumption after innovation is reduced by 23.8 percent compared with the total fuel consumption before innovation. The power consumption in the process energy consumption before innovation: the total power consumption before innovation is 62.755kgce/t, while the total power consumption after innovation is 56.67 kgce/t, and the total power consumption is reduced by 9.7 percent compared with the total power consumption before innovation. The recovery is reduced by 81.77 kgce/t compared with the recovery before innovation.
Comparing the energy consumption of the processes before innovation in 4 months to 2020 months in 2019 with the energy consumption of the processes after innovation in 5 months
Detailed Description
The present invention will be further described with reference to specific embodiments.
Example (b): a method for reducing the energy consumption of an Ou metallurgical furnace,
1. one of the conditions of the smooth operation of the smelting furnace is to keep the smooth operation of the furnace condition while considering the economy, and particularly the smooth operation of the furnace condition of the shaft furnace is particularly important, according to the existing ore blending resource condition of an eight-steel iron-making plant, acid pellet ore is matched with high-alkalinity sinter ore, and according to the cost performance and the economy of ore smelting, the optimal ore blending structure suitable for the burden structure of the reduction furnace of the smelting furnace is obtained as follows:
the compressive strength of the pellet is improved and is more than 2200N. Stabilizing the composition of the sinter, wherein the alkalinity of the sinter is stabilized at R =2.4 times, and the ratio of MgO: 2.4 percent and the strand rotation is more than 80 percent.
2. Low coke ratio operation structure and fuel size fraction management: the fuel of the European smelting furnace mainly adopts a production process of coke, foam coal (coke powder) and blowing bituminous coal, in order to improve the gas generation amount, the volatile component of the coal is higher than that of the coke, and in order to reduce the cost, enough foam coal and coke powder are ensured to be used under the condition of ensuring the replacement ratio of granular coal and the coke. The Europe and metallurgy furnace has great optimization and promotion space in terms of fuel structure, granularity composition and coke quality. The particle size of the foam coal and the coke powder fed into the gasifier is improved by screening, the foam coal and the coke powder with the particle size larger than 5mm are added into the gasifier to replace part of coke usage, the purpose of reducing the large coke ratio is achieved, meanwhile, the consumption of small particle coal powder after entering the coal gas and being subjected to dust removal and cleaning is reduced, namely, the coal gas quality is improved, the dust removal load is reduced, and the method has great significance for reducing the coal consumption.
The coke ratio before innovation is 250kg, and the coke ratio is 237.5 kgce/t ton iron standard coal, and the coke ratio after innovation is 275kg, and the coke ratio is 261.25 kgce/t ton iron standard coal. The innovative rear coke ratio comprises 2500m3The proportion of unused 5-25mm coke pieces discharged by the blast furnace is 130 kg/t iron, so that the complementation of the fuel of the blast furnace and the Europe and metallurgy furnace is realized, and a large amount of coke pieces which can not be used by the blast furnace are consumed. The coke-to-iron ratio is removed, and the large coke ratio is 145 kg/t iron after innovation. The use of the prime movers is not mentioned before innovation, and the prime factors before innovation are accounted for with 0.95 prime factors at large coke ratios
The technical measures for reducing the large coke ratio are as follows: 1) the shaft furnace improves the gas flow distribution in a mode of mixing ore coke, obtains reasonable reduced gas flow, improves the metallization rate of ores, ensures that the gas produced by the gasification furnace enters the shaft furnace burden to be fully reacted and reduced, the burden enters the gasification furnace only by heating and melting, and after the shaft furnace burden is mixed with coke particles, the gas distribution tends to be reasonable, the gas utilization rate is improved, the metallization rate of the shaft furnace is improved, the gas is fully contacted with the burden, the gas utilization effect is improved, and therefore, the shaft furnace is matched with small coke to have important influence on the reduction of the large coke. 2) The vault coal injection technology is an original technology for reducing energy consumption and coke ratio of an Ou-Meta furnace, after a vault coal injection system is put into use, the coal injection quantity is stabilized to be about 150 kg/tHM, reduced coal gas is changed in quantity and quality at the vault of a gasification furnace, and CO in coal gas components2The improvement is obvious, and the reduction is from about 14 percent to below 10 percent; the metallization rate of the shaft furnace is greatly increased, and the average value is increased from 19.8% to 38.1%; the large coke ratio is reduced by 30 Kg/t.HM. The effect of improving the metallization rate of the shaft furnace and reducing the coke ratio is obvious after the vault coal injection technology is implemented. 3) The material level of the gasification furnace is stabilized, 25 material levels before tapping are stabilized at 50%, and 24 material levels after tapping are not less than 100%. The low material level or the long-term full material level is avoided. 4) Stabilizing the material level of the shaft furnace, and controlling the radar material level at 20Between-20.5 m, low material level is avoided.
Before innovation, the coal (coke powder) is 850kg, the coal turns to 677.45 kgce/t ton of iron standard coal, after innovation, the coke ratio is 525kg, and the coal turns to 418.43 kgce/t ton of iron standard coal. The coal (coke powder) consumption is far lower than the indexes before innovation. Measures taken to reduce coal (coke breeze) consumption: 1) the pressure of the factory is increased and stabilized at about 310 kPa. The flow velocity of the coal gas is reduced, so that the coal gas is reduced more fully. 2) The coke powder is 2500m3The coke foam is discharged from the blast furnace, and the granularity of 5-10mm is about 60%. 3) The granularity of the foam coal is improved by 5-10mm and is kept above 50%. 4) The moisture of the coke foam is less than 5 percent, and the moisture of the foam coal is less than 8 percent. The specific components are shown in the following table:
5) the volatile matter of the foam coal is controlled to be more than 35 percent, and the gas generation amount is improved.
Consumption of euler's furnace gas: as the technology of coal gas injection through the vault coal gas production and the top coal gas circulating tuyere is developed in the technical innovation of the Ou-Meta furnace, the coal powder required by the coal gas production needs to be dried and then injected to the vault of the gasification furnace, the technology of the flue gas furnace is used in the process of drying the coal powder, and 20Nm is consumed3Pert iron Ou Meta furnace. Because the Ou smelting furnace adopts total oxygen smelting, the Ou smelting furnace does not relate to a hot-blast furnace, and the flue gas used for drying the coal powder adopts the flue gas self-circulation technology of a flue gas furnace for producing coal gas, thereby saving energy and protecting environment.
40Nm coal gas consumption of top coal gas circulation tuyere injection technology3T iron gas. The gas injected from the top gas circulation tuyere is beneficial to reducing the theoretical combustion temperature of the tuyere of the gasification furnace and inhibiting [ Si [ ]]The reduction of the gasification furnace stabilizes the furnace condition of the gasification furnace and reduces the fuel consumption.
The technical measures for reducing the power consumption are as follows:
1) optimizing the feeding capacity of the raw material belt, adjusting the corresponding feeding speed, reducing the feeding time, adjusting the amplitude of each electric vibration feeder, wherein the electric vibration flow of an M inlet line No. 5 and No. 6 is less than 280t/h, the J series flow is less than 300t/h, and the feeding time of each variety of materials is adjusted and optimized;
2) the slot position control of the coke foam, the foam coal and the semi-coke foam is optimized and adjusted to be 8-17 m, the single feeding amount is increased, and the feeding times are reduced;
3) the pulse frequency of the dust removal cloth bag is optimized and reduced to 30 min.
4) Reactive compensation: and adjusting reactive compensation according to the load condition to enable the power factor to meet the requirement of 0.93.
Claims (1)
1. A method for reducing energy consumption of an Ou metallurgical furnace is characterized by comprising the following implementation steps:
1) the acid pellet ore is matched with the high-alkalinity sinter ore, and according to the cost performance and the economy of ore smelting, the ore blending structure suitable for the burden structure of the reduction furnace of the European smelting furnace is obtained as follows: 40% of sintered ore, 57% of pellet, 3% of raw ore and 97% of clinker, improves the compressive strength of the pellet, enables the compressive strength to be larger than 2200N, stabilizes the components of the sintered ore, stabilizes the alkalinity of the sintered ore at R =2.4 times, and has MgO: 2.4 percent and the strand rotation is more than 80 percent;
2) low coke ratio operation structure and fuel size management: the coke ratio is 275kg, and the coke ratio comprises 2500m3The proportion of unused 5-25mm coke breeze discharged by the blast furnace is 130 kg/t iron, the complementation of the fuel of the blast furnace and the Europe and metallurgy furnace is realized, a large amount of coke breeze which can not be used by the blast furnace is consumed, the coke breeze ratio is removed, and the large coke ratio is 145 kg/t iron; the vault coal injection is carried out, the coal injection quantity stably reaches about 150 Kg/tHM, and the large coke ratio is reduced by 30 Kg/t.HM;
3) stabilizing the material level of the gasification furnace, wherein 25 material levels before tapping are stabilized at 50%, and 24 material levels after tapping are not less than 100%, so that low material levels or long-term full material levels are avoided;
4) stabilizing the material level of the shaft furnace, controlling the radar material level to be between 20 and 20.5m, and avoiding low material level, wherein the coke ratio is 525kg, and 418.43 kgce/t ton iron standard coal is obtained; the pressure of a factory is increased and stabilized at about 310kPa, and the flow rate of coal gas is reduced, so that the coal gas is reduced more fully; the coke powder is 2500m3Discharging coke powder outside the blast furnace, wherein the granularity of 5-10mm is 60%, the granularity of the coal foam is 5-10mm, the granularity is kept above 50%, the moisture of the coke powder is less than 5%, and the moisture of the coal foam is less than 8%;
list of foam coal and coke powder
5) The volatile content of the foam coal is controlled to be more than 35 percent, the gas generation amount is improved, and the gas consumption of the technology of injecting gas through the top gas circulating tuyere is 40Nm3The top coal gas circulation tuyere injecting coal gas of the iron gas is beneficial to reducing the theoretical combustion temperature of the tuyere of the gasification furnace, inhibiting the reduction of Si, stabilizing the furnace condition of the gasification furnace and reducing the fuel consumption.
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| CN111748667A (en) * | 2020-07-07 | 2020-10-09 | 新疆八一钢铁股份有限公司 | Iron-smelting method for reducing fuel ratio of Europe smelting furnace |
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| CN111748667A (en) * | 2020-07-07 | 2020-10-09 | 新疆八一钢铁股份有限公司 | Iron-smelting method for reducing fuel ratio of Europe smelting furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115404298A (en) * | 2022-08-12 | 2022-11-29 | 新疆八一钢铁股份有限公司 | Method for coal injection of Ou metallurgical furnace |
| CN115404298B (en) * | 2022-08-12 | 2023-07-28 | 新疆八一钢铁股份有限公司 | Coal injection method for European smelting furnace |
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