CN109988590B - Smelting method of low-thermal-state strength coke used for large blast furnace - Google Patents
Smelting method of low-thermal-state strength coke used for large blast furnace Download PDFInfo
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/04—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
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Abstract
The invention discloses a smelting method of low-thermal-state strength coke used by a large blast furnace, which comprises the following implementation steps: 1. the coking process and production management are adjusted, the calibration of a coal blending scale is enhanced, and accurate blending is realized; 2. setting the breaking fineness of the coking coal according to the coke, fertilizer, gas and lean, properly adjusting the number of hammers in the breaker, and stabilizing the quality of the blended coal by enhancing the quality monitoring of various coals in the coal blending tank; 4. optimizing a stokehole operation system, and stably keeping the depth of the taphole within the range of 3.3-3.5 meters; 5. optimizing a thermal system, and controlling the physical temperature of molten iron according to 1500 +/-20 ℃; 6. optimizing an air supply system; 7. the upper part charging system is optimized, and the control standard of the upper part charging system is as follows: the material distribution mode is multi-ring material distribution, the shape of the material surface is a platform with a funnel, the central temperature of the coal gas flow is 500 ℃, the edge temperature of the coal gas flow is 150 ℃, and the blast furnace pressure difference is 145 kpa; 8. the coke load was adjusted to 4.0-4.2.
Description
Technical Field
The invention relates to a smelting method of low-thermal-state strength coke used by a large blast furnace.
Background
The coke is vital to blast furnace production and plays roles of a heating agent, a reducing agent, a carburizing agent and a framework in the blast furnace smelting process. Therefore, the blast furnace has strict requirements on the quality indexes such as the chemical composition, the mechanical strength, the physical property and the like of the coke, and the larger the blast furnace is, the higher the quality requirement on the coke is, wherein the thermal strength of the coke is particularly important. The quality index of the coke for 73 blast furnaces with complete national coke index statistics is averaged, and the average furnace volume of the 73 blast furnaces is 2282 m3And the thermal state performance of the coke in the quality indexes of the used coke is obviously higher than the requirement of national standard first-grade coke quality, and the importance of the thermal state performance of the coke on the production of large-scale blast furnaces is highlighted. At present, the excess of steel productivity and the reduction of ironmaking cost are the necessary routes for the adversity survival of steel enterprises.
Disclosure of Invention
The invention aims to provide a smelting method for a large blast furnace by using low-thermal-state strength coke, which can be used for producing by using the coke with low thermal-state performance, not only can ensure the stable and smooth production of the blast furnace, but also can obviously reduce the iron-making cost.
The invention aims to realize the smelting method of the coke with low thermal state strength for the large-scale blast furnace, which comprises the following implementation steps:
1. the method comprises the following steps of adjusting a coking process and production management, strengthening the calibration of a coal blending scale, and realizing accurate blending, wherein the specific measures comprise the following steps: A. according to the coal blending scheme, single coal is fed to an electronic blending belt scale through a disc feeder arranged below a coal blending groove, and blended coal is fed into a coke oven coal tower through a belt conveyor; B. the coal charging process of the coke oven is uniformly completed through a rotary distributing machine; C. selecting a proper disk feeder and an electronic batching belt scale according to the proportion of single coal in the coal blending structure; D. the belt weigher is regularly calibrated, and the precision error of the weigher is within the range of national standard;
2. the breaking fineness of the coking coal is set according to the coke, the fertilizer, the gas and the lean, the number of the hammers in the crusher is properly adjusted, and the corresponding numerical values between the granularity of the coking coal and the number of the breaking hammers are as follows: the number of breaking hammers is 128 under the condition that the particle size of the coking coal produced by gas coal is less than 3mm in 82%, the number of breaking hammers is 120 under the condition that the particle size of the coking coal produced by lean coal, coking coal and gas fat coal is less than 3mm in 80%, and the number of breaking hammers is 58 under the condition that the particle size of the coking coal produced by fat coal is less than 3mm in 75%; firstly, external single coal passes through a double-roller crusher and then is sent into a pre-crusher chamber through an iron remover, then is sent into an intermediate bin after being pre-crushed, and then is sent into a secondary crusher through a belt conveyor to be secondarily crushed, and then is sent into a corresponding coal blending groove after meeting the index requirement;
3. through strengthening various coal quality control in the blending tank, stabilize the blending coal quality, its qualification rate reaches more than 98%, and concrete measure includes: A. the coking coal is stored in the coking coal chamber in a classified mode, a storage period is reserved in the storage process, and quality sampling inspection is carried out on the coking coal during the storage period; B. according to the coal utilization plan, the operation is strictly carried out according to the process instruction, and the coal mixing in the transportation process is avoided; C. strictly executing the requirement of coal crushing fineness; D. blending coal according to a coal blending plan strictly; E. sampling and sampling the coal in all the coal storage tanks by the white class every day, and inspecting the components of the coal to prevent the coal mixing phenomenon; F. detecting the components of the blended coal every day, comparing the components with theoretical calculation, and controlling the quality of the blended coal; the coke side and machine side heating temperatures are properly adjusted by combining a coal blending scheme and the coking time of coke oven production, and the standard temperature of the coke oven and the temperature of a furnace end fire channel are controlled, so that the combustion chamber is uniformly heated, the coke quality is ensured, and the coal gas consumption is saved;
4. optimizing a stokehole operation system, adjusting the interval tapping of the blast furnace to gapless tapping in order to discharge slag iron in a hearth in time, and arranging three iron outlets for tapping in turn when a stokehole main channel is not overhauled; by enhancing the management in front of the furnace, the depth of the taphole is stably kept within the range of 3.3-3.5 meters;
5. optimizing a thermal system, and controlling the physical temperature of molten iron according to 1500 +/-20 ℃;
6. the air supply system is excellentThe blast furnace air supply system index control standard is as follows: the blowing kinetic energy is controlled within the range of 110 +/-10 KJ/s; the air inlet area is 0.32 +/-0.015 m2The air speed of the air port is 250 +/-10 m/s, and the air port is arranged as follows: uniformly arranging, wherein the diameters of two adjacent air ports above the iron notch are smaller than those of the other air ports by 5mm, initiating coal gas flow, and reversing a V shape;
7. the upper part charging system is optimized, and the control standard of the upper part charging system is as follows: the material distribution mode is multi-ring material distribution, the shape of the material surface is platform funnel, the central temperature of the coal gas flow is 500 ℃, the edge temperature of the coal gas flow is 150 ℃, and the blast furnace differential pressure is 145 Kpa;
8. the coke load was adjusted to 4.0-4.2.
The invention is made of eight steels (2500 m)3Production practice is carried out, great success is achieved in 2015 and 2016, the contradiction that high-quality coke resources required by large-scale blast furnaces cannot be produced due to shortage of high-quality coke coal resources at the northwest of eight-steel places is solved, coal mine resources with the Bayier ditch of eight-steel are fully utilized, meanwhile, coke coal in Xinjiang Kubai areas is fully developed and utilized, dependence of the eight-steel on the high-quality coke coal at the inner land is greatly reduced, cost is saved by 80-100 yuan per ton of direct iron, economic benefit is remarkable, occupation of a large amount of logistics resources is reduced, and high social benefit is achieved.
The application of the invention aims to break through the conventional and breakthrough process technology, realize the use of the coke with low thermal state strength in the production of large-scale blast furnaces by innovating and optimizing the blast furnace process, improve the utilization rate of coke coal resources, enlarge the available resources of the coke coal, reduce the iron-making cost, improve the competitive power and the economic benefit of iron and steel enterprises, and obtain wide attention in the iron and steel enterprises, thus having remarkable practical significance. By the method, the iron and steel plants can greatly reduce the dependence on high-quality coking coal resources, broaden the utilization range of coking coal resources, and different iron and steel plants can produce coke according to regional coal blending, so that the cost of molten iron is reduced, and huge economic and social benefits are generated.
Detailed Description
A smelting method of coke with low thermal state strength used by a large-scale blast furnace comprises the following implementation steps:
1. the method comprises the following steps of adjusting a coking process and production management, strengthening the calibration of a coal blending scale, and realizing accurate blending, wherein the specific measures comprise the following steps: A. according to the coal blending scheme, single coal is fed to an electronic blending belt scale through a disc feeder arranged below a coal blending groove, and blended coal is fed into a coke oven coal tower through a belt conveyor; B. the coal charging process of the coke oven is uniformly completed through a rotary distributing machine; C. selecting a proper disk feeder and an electronic batching belt scale according to the proportion of single coal in the coal blending structure; D. the belt weigher is regularly calibrated, and the precision error of the weigher is within the range of national standard;
2. the breaking fineness of the coking coal is set according to the coke, the fertilizer, the gas and the lean, the number of the hammers in the crusher is properly adjusted, and the corresponding numerical values between the granularity of the coking coal and the number of the breaking hammers are as follows: the number of breaking hammers is 128 under the condition that the particle size of the coking coal produced by gas coal is less than 3mm in 82%, the number of breaking hammers is 120 under the condition that the particle size of the coking coal produced by lean coal, coking coal and gas fat coal is less than 3mm in 80%, and the number of breaking hammers is 58 under the condition that the particle size of the coking coal produced by fat coal is less than 3mm in 75%; firstly, external single coal passes through a double-roller crusher and then is sent into a pre-crusher chamber through an iron remover, then is sent into an intermediate bin after being pre-crushed, and then is sent into a secondary crusher through a belt conveyor to be secondarily crushed, and then is sent into a corresponding coal blending groove after meeting the index requirement;
3. through strengthening various coal quality control in the blending tank, stabilize the blending coal quality, its qualification rate reaches more than 98%, and concrete measure includes: A. the coking coal is stored in the coking coal chamber in a classified mode, a storage period is reserved in the storage process, and quality sampling inspection is carried out on the coking coal during the storage period; B. according to the coal utilization plan, the operation is strictly carried out according to the process instruction, and the coal mixing in the transportation process is avoided; C. strictly executing the requirement of coal crushing fineness; D. blending coal according to a coal blending plan strictly; E. sampling and sampling the coal in all the coal storage tanks by the white class every day, and inspecting the components of the coal to prevent the coal mixing phenomenon; F. detecting the components of the blended coal every day, comparing the components with theoretical calculation, and controlling the quality of the blended coal; the coke side and machine side heating temperatures are properly adjusted by combining a coal blending scheme and the coking time of coke oven production, and the standard temperature of the coke oven and the temperature of a furnace end fire channel are controlled, so that the combustion chamber is uniformly heated, the coke quality is ensured, and the coal gas consumption is saved;
4. optimizing a stokehole operation system, adjusting the interval tapping of the blast furnace to gapless tapping in order to discharge slag iron in a hearth in time, and arranging three iron outlets for tapping in turn when a stokehole main channel is not overhauled; by enhancing the management in front of the furnace, the depth of the taphole is stably kept within the range of 3.3-3.5 meters;
5. optimizing a thermal system, and controlling the physical temperature of molten iron according to 1500 +/-20 ℃;
6. optimizing the air supply system, wherein the index control standard of the air supply system of the blast furnace is as follows: the blowing kinetic energy is controlled within the range of 110 +/-10 KJ/s; the air inlet area is 0.32 +/-0.015 m2The air speed of the air port is 250 +/-10 m/s, and the air port is arranged as follows: uniformly arranging, wherein the diameters of two adjacent air ports above the iron notch are smaller than those of the other air ports by 5mm, initiating coal gas flow, and reversing a V shape;
7. the upper part charging system is optimized, and the control standard of the upper part charging system is as follows: the material distribution mode is multi-ring material distribution, the shape of the material surface is platform funnel, the central temperature of the coal gas flow is 500 ℃, the edge temperature of the coal gas flow is 150 ℃, and the blast furnace differential pressure is 145 Kpa;
8. the coke load was adjusted to 4.0.
Claims (1)
1. A smelting method of coke with low thermal state strength used by a large-scale blast furnace comprises the following implementation steps:
1. the method comprises the following steps of adjusting a coking process and production management, strengthening the calibration of a coal blending scale, and realizing accurate blending, wherein the specific measures comprise the following steps: A. according to the coal blending scheme, single coal is fed to an electronic blending belt scale through a disc feeder arranged below a coal blending groove, and blended coal is fed into a coke oven coal tower through a belt conveyor; B. the coal charging process of the coke oven is uniformly completed through a rotary distributing machine; C. selecting a proper disk feeder and an electronic batching belt scale according to the proportion of single coal in the coal blending structure; D. the belt weigher is regularly calibrated, and the precision error of the weigher is within the range of national standard;
2. the breaking fineness of the coking coal is set according to the coke, the fertilizer, the gas and the lean, the number of the hammers in the crusher is properly adjusted, and the corresponding numerical values between the granularity of the coking coal and the number of the breaking hammers are as follows: the number of breaking hammers is 128 under the condition that the particle size of the coking coal produced by gas coal is less than 3mm in 82%, the number of breaking hammers is 120 under the condition that the particle size of the coking coal produced by lean coal, coking coal and gas fat coal is less than 3mm in 80%, and the number of breaking hammers is 58 under the condition that the particle size of the coking coal produced by fat coal is less than 3mm in 75%; firstly, external single coal passes through a double-roller crusher and then is sent into a pre-crusher chamber through an iron remover, then is sent into an intermediate bin after being pre-crushed, and then is sent into a secondary crusher through a belt conveyor to be secondarily crushed, and then is sent into a corresponding coal blending groove after meeting the index requirement;
3. through strengthening various coal quality control in the blending tank, stabilize the blending coal quality, its qualification rate reaches more than 98%, and concrete measure includes: A. the coking coal is stored in the coking coal chamber in a classified mode, a storage period is reserved in the storage process, and quality sampling inspection is carried out on the coking coal during the storage period; B. according to the coal utilization plan, the operation is strictly carried out according to the process instruction, and the coal mixing in the transportation process is avoided; C. strictly executing the requirement of coal crushing fineness; D. blending coal according to a coal blending plan strictly; E. sampling and sampling the coal in all the coal storage tanks by the white class every day, and inspecting the components of the coal to prevent the coal mixing phenomenon; F. detecting the components of the blended coal every day, comparing the components with theoretical calculation, and controlling the quality of the blended coal; the coke side and machine side heating temperatures are properly adjusted by combining a coal blending scheme and the coking time of coke oven production, and the standard temperature of the coke oven and the temperature of a furnace end fire channel are controlled, so that the combustion chamber is uniformly heated, the coke quality is ensured, and the coal gas consumption is saved;
4. optimizing a stokehole operation system, adjusting the interval tapping of the blast furnace to gapless tapping in order to discharge slag iron in a hearth in time, and arranging three iron outlets for tapping in turn when a stokehole main channel is not overhauled; by enhancing the management in front of the furnace, the depth of the taphole is stably kept within the range of 3.3-3.5 meters;
5. optimizing a thermal system, and controlling the physical temperature of molten iron according to 1500 +/-20 ℃;
6. optimizing the air supply system, wherein the index control standard of the air supply system of the blast furnace is as follows: the blowing kinetic energy is controlled within the range of 110 +/-10 KJ/s; the air inlet area is 0.32 +/-0.015 m2The air speed of the air port is 250 +/-10 m/s, and the air port is arranged as follows: uniformly arranged, the diameters of two adjacent air ports above the iron notch are smaller than those of other air ports by 5mm initiallyCoal gas flow, inverted V-shape;
7. the upper part charging system is optimized, and the control standard of the upper part charging system is as follows: the material distribution mode is multi-ring material distribution, the shape of the material surface is platform funnel, the central temperature of the coal gas flow is 500 ℃, the edge temperature of the coal gas flow is 150 ℃, and the blast furnace differential pressure is 145 Kpa;
8. the coke load was adjusted to 4.0-4.2.
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| DE2960478D1 (en) * | 1978-04-14 | 1981-10-22 | Great Lakes Carbon Corp | Coke for use in the production of gray iron; method of producing said coke and method of producing gray iron by using said coke |
| LU91493B1 (en) * | 2008-10-31 | 2010-05-03 | Wurth Paul Sa | Method for operating a blast furnace and blast furnace installation |
| CN102337369B (en) * | 2011-10-27 | 2014-02-05 | 北京首钢国际工程技术有限公司 | High-wind-temperature rotational flow injection disturbance melting reduction and prereduction combination device and method |
| WO2013153555A1 (en) * | 2012-04-12 | 2013-10-17 | Jsw Steel Limited | A devolatalization catalyst for devolatalization of coals and a process for the manufacture of coke with improved cri and csr values using such catalyst. |
| CN105755191B (en) * | 2016-03-30 | 2018-01-16 | 北京科技大学 | A kind of Optimized Coal Blending method of Blowing Brown Coal into BF |
| CN106987665A (en) * | 2017-02-17 | 2017-07-28 | 宝钢集团新疆八钢铁有限公司 | A kind of production technology that large blast furnace coke is refined with low-heat state coal at high proportion |
| CN107419052A (en) * | 2017-07-14 | 2017-12-01 | 新疆八钢铁股份有限公司 | The furnace drying method after fire proof material of furnace lining is changed in 120t converters |
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Effective date of registration: 20230220 Address after: 830000 Xingang Road, Toutunhe District, Urumqi, Xinjiang Uygur Autonomous Region Patentee after: XINJIANG BAYI IRON & STEEL Co.,Ltd. Patentee after: Nilek Ruixiang Coking Co.,Ltd. Address before: 830022 No. 1 Bayi Road, Toutun River District, the Xinjiang Uygur Autonomous Region, Urumqi Patentee before: XINJIANG BAYI IRON & STEEL Co.,Ltd. |