CN106480248B - Blast furnace operation method with dust, mud, iron and carbon balls as partial furnace burden - Google Patents

Abstract

The invention discloses a method for operating a blast furnace in which a new type of furnace material, that is, iron carbon spheres of dust sludge is used as part of the furnace material. According to the method, the operation and production of the blast furnace can be carried out reasonably, and the new type of furnace material dust mud iron carbon balls can be rationally used in the production process of the blast furnace, so that the blast furnace can be stabilized Going forward, low consumption and long life, and at the same time can reduce the production cost of ironmaking, so as to achieve economical smelting.

Description

A blast furnace operation method using dust sludge iron carbon balls as part of the charge

technical field

The invention belongs to the technical field of ironmaking in the iron and steel industry, and in particular relates to an operation method in which iron-carbon spheres made of metallurgical dust and mud are used as part of the charge for a blast furnace, and the upper and lower parts of the blast furnace are adjusted in combination.

Background technique

In recent years, with the rapid economic growth, various industries have achieved high-speed growth under this background, especially iron and steel enterprises, the production capacity has been greatly released compared with the past, and with the continuous expansion of output, the main technology Secondary products, such as dedusting ash, CDQ, steel slag and iron red, etc. have increased significantly compared with the past. In recent years, around these secondary products, enterprises have intensified their efforts to carry out research on this, and developed more products, such as new forms of furnace materials such as dust mud ferrocarbon spheres, cold-consolidated pellets, etc. On this basis, a series of relatively mature manufacturing technologies have been formed. Although these products are relatively mature in manufacturing, and have some successful application examples, such as for rotary hearth furnace production process, shaft furnace process, etc., However, from the perspective of application effect, it has not been able to meet the expectations of enterprises. With the stricter cost control among enterprises, cost evaluation has become the most important indicator among enterprises. As far as metallurgical production technology is concerned at the present stage, blast furnace is the most important in terms of resources, economy and operability. China's advanced ironmaking process is still irreplaceable. More than 80% of the world's molten iron is still obtained through blast furnace ironmaking. The blast furnace process is still the most cost-effective ironmaking production process. With the shortage of resource conditions and market factors, how to successfully apply the products made of the secondary products of these iron and steel plants, such as dust sludge iron carbon balls, etc. It can also solve the utilization of the secondary products of the iron and steel plant in the factory, which is the primary problem faced by the current work. From the perspective of blast furnace production technology at home and abroad, according to their actual situation and resource conditions, these enterprises have formed their own characteristic furnace material matching structure, and on this basis, they have formed their own characteristic blast furnace operation methods, and have achieved Nice application effect. In order to make rational use of the secondary resources in the factory and broaden the use range and variety of furnace charges, various manufacturers have also made various attempts here, and have carried out a series of laboratory research and pilot-scale industrial testing of these new forms of charge for blast furnaces. In practice, an attempt is made to find out methods and technologies suitable for the operation of blast furnaces with these traditional charges. However, due to some technical limitations, there are still many areas that are debatable in the application of the process, and there are still many areas that are worthy of further study.

Compared with the maturity of the application technology of sinter and pellets used in traditional blast furnace charges, how these new forms of charge, such as dust, mud, iron carbon balls, and how to finally get a reasonable application in the blast furnace is a reality that metallurgists must face A tricky problem. And domestic and foreign documents and materials are rarely reported on this. Even if a small amount of mentions are made of the use of these furnace materials, such as the utilization of dust and mud products, most of them are discussing processes such as direct reduction of rotary hearth furnaces, or as Converter steelmaking coolants and other methods are used. For blast furnaces, there are not many related researches in terms of basic mechanism and laboratory research. As the country with the largest output of secondary products in the metallurgical industry, my country is one of the countries that paid attention to the application of dust and sludge earlier. There are many colleges and enterprise R&D institutions participating in the research and experiment work in this field, such as Anshan Iron and Steel Group, Beijing University of Science and Technology, etc. , and successfully developed a variety of dust and mud products, and through the use of laboratory or semi-industrial small-scale experiments, it was concluded that dust and mud iron carbon balls are used as blast furnace charge, and its operating system is different from the traditional operation concept of charge into the furnace important conclusions. Although the company has successfully used dust, mud, iron carbon balls, etc. through other technological methods at the same time, and achieved some results, but at the same time the problem is also obvious, that is, the energy consumption is too high, which is not cost-effective from an economic point of view, and the blast furnace as an energy source Using one of the highest production containers, what means and measures to use, combined with dust, mud, iron carbon balls, etc. to get the most reasonable use in large blast furnaces at home and abroad, is one of the most concerned issues for metallurgists at present.

As a charge different from the traditional charge, dust-sludge iron-carbon spheres have gradually attracted attention and research at home and abroad. Due to many restrictive conditions, although the dust mud iron carbon ductile iron and steel plant is produced as a secondary product, most of them stay on how to produce and manufacture, and are mainly applied to processes other than blast furnaces. At present, there is no relatively mature technology for using dust-sludge iron-carbon spheres in blast furnaces. On the basis of existing conditions, a major breakthrough in the utilization technology of dust mud iron carbon spheres has not been realized.

Technical solutions

The technical problem to be solved by the present invention is to provide a blast furnace operation method in which a new type of furnace charge, that is, dust sludge iron carbon balls, is used as part of the charge according to the development trend of blast furnaces adopting new charge in the future. In the process, the new type of furnace charge dust sludge iron carbon balls is rationally used to make the blast furnace run smoothly, with low consumption and long life. At the same time, it can reduce the production cost of ironmaking and achieve economical smelting.

A method for operating a blast furnace using dust-sludge iron-carbon spheres as a part of the charge is realized through the following technical scheme:

1, a kind of blast furnace operation method using dust mud iron carbon ball as part charge, it is characterized in that: dust mud iron carbon ball is used as part raw material of blast furnace, the chute inclination angle on the basis of original blast furnace design, outward extension A °; Sludge iron carbon ball enters furnace separately as a kind of burden, and adding mass percentage ratio does not allow to exceed 30% of charge mass percentage ratio, enters furnace coke amount and reduces mass percentage ratio is the C of dust mud iron carbon ball adding mass percentage ratio; The tuyere area of the lower hearth, the reduction ratio of the tuyere area and the percentage of the added amount of dust and mud iron carbon balls in the total charge mass percentage show a PA linear correspondence; The distributing method of the material clock rotating chute is to arrange the dust mud iron carbon balls at the edge of the furnace throat instead of the center of the blast furnace. The amount of material placed at the place shall not exceed 1/3 of the amount of dust, mud, iron-carbon balls entering the furnace; while the dust, mud, iron-carbon balls are entering the furnace, adjust the lower operating system to increase the blast volume, and the increase in the blowing air volume is equal to the addition of dust, mud, iron-carbon balls The BW of the mass percentage; reduce the amount of pulverized coal injection, the reduction range of the pulverized coal injection is the SC of the mass percentage of dust mud iron carbon balls; increase the oxygen content in the blast, and the oxygen content increase range is dust mud iron Carbon ball adds the CO of mass percent, increases hot blast temperature, and hot blast temperature increases range is the ST of dust mud iron carbon ball adding mass percent, increases slag alkalinity, and basicity increases range is that dust mud iron carbon ball adds mass percentage example AI.

The inclination and extension angle of the chute is calculated according to the following formula: A°=0.5°+DICB×K ₁ ; the mass percentage reduction of coke in the furnace is determined according to the following formula: C=DICB×K ₂ ; the reduction ratio of the tuyere area is as follows Carry out the formula: PA=DICB×K ₃ ; increase ratio of blowing air volume according to the following formula: BW=DICB×K ₄ ; reduce ratio of pulverized coal injection according to the following formula: SC=DICB×K ₅ ; The increase ratio of volume is carried out according to the following formula: CO=DICB×K ₆ ; the increase ratio of hot air temperature is carried out according to the following formula: ST=DICB×K ₇ ; the increase ratio of slag alkalinity is carried out according to the following formula: AI=DICB×K ₈ .

In the formula:

DICB: mass percentage of iron-carbon spheres added in dust and mud, %; A°: chute inclination angle, °, K ₁ coefficient, value range 3 to 8; C: mass percentage of coke entering the furnace, %, K ₂ coefficient , the value range is 0.2~0.4; PA: the reduction ratio of the air outlet area, %, K ₃ coefficient, the value range is 0.1~0.3; BW: the increase ratio of the blast air volume, %, K ₄ coefficient, the value range is 0.2~0.4; SC: reduction ratio of pulverized coal injection, %, K ₅ coefficient, value range 0.2-0.4; CO: oxygen content increase ratio, %, K ₆ coefficient, value range 0.3-0.9; ST: hot air temperature increase ratio , %, K ₇ coefficient, value range 0.1～0.3; AI: slag basicity increase ratio, %, K ₇ coefficient, value range 0.05～0.2.

2. A method for operating a blast furnace using dust-sludge iron-carbon spheres as part of the furnace charge, characterized in that: dust-sludge iron-carbon spheres are used as part of the raw materials for the blast furnace, and the inclination angle of the chute on the basis of the original blast furnace design extends A° to the outside; Furnace metallurgical coke is mixed. When mixing, the mass percentage of dust mud iron carbon balls added does not exceed 20% of the total charge; There is a PA linear correspondence between the tuyeres in the lower hearth, the reduction ratio of the tuyere area and the percentage of the amount of iron carbon balls added to the total charge mass; The chute distribution method is to arrange the dust, mud, iron-carbon balls at the position of the central coke material column, rather than at the edge of the furnace throat or between the furnace throat and the central coke column; at the same time, the number of ore distribution circles at the edge of the furnace throat shall not exceed 3 circles ;The ore at the edge of the furnace throat should not exceed 1/3 of the amount of ore entering the furnace; while the dust, mud iron carbon balls are entering the furnace, adjust the lower operating system to increase the blast volume, and the increase in the blast air volume is the addition of dust, mud iron carbon balls The BW of the mass percentage; reduce the amount of pulverized coal injection, the reduction range of the pulverized coal injection is the SC of the mass percentage of dust mud iron carbon balls; increase the oxygen content in the blast, and the oxygen content increase range is dust mud iron Carbon ball adds the CO of mass percent, increases hot blast temperature, and hot blast temperature increases range is the ST of dust mud iron carbon ball adding mass percent, increases slag alkalinity, and basicity increases range is that dust mud iron carbon ball adds mass percentage example AI.

The inclination and extension angle of the chute is calculated according to the following formula: A°=0.5°+DICB×K ₁ ; the mass percentage reduction of coke in the furnace is determined according to the following formula: C=DICB×K ₂ ; the reduction ratio of the tuyere area is as follows Carry out the formula: PA=DICB×K ₃ ; increase ratio of blowing air volume according to the following formula: BW=DICB×K ₄ ; reduce ratio of pulverized coal injection according to the following formula: SC=DICB×K ₅ ; The increase ratio of the volume is carried out according to the following formula: CO=DICB×0.7K ₆ ; the increase ratio of the hot air temperature is carried out according to the following formula: ST=DICB×K ₇ ; the increase ratio of the slag alkalinity is carried out according to the following formula: AI=DICB×K ₈ .

In the formula:

DICB: mass percentage of iron-carbon spheres added in dust and mud, %; A°: chute inclination angle, °, K ₁ coefficient, value range 3 to 8; C: mass percentage of coke entering the furnace, %, K ₂ coefficient , the value range is 0.1~0.3; PA: the reduction ratio of the air outlet area, %, K ₃ coefficient, the value range is 0.1~0.3; BW: the increase ratio of the blast air volume, %, K ₄ coefficient, the value range is 0.1~0.3; SC: reduction ratio of pulverized coal injection, %, K ₅ coefficient, value range 0.2-0.4; CO: oxygen content increase ratio, %, K ₆ coefficient, value range 0.3-0.9; ST: hot air temperature increase ratio , %, K ₇ coefficient, value range 0.1～0.3; AI: slag basicity increase ratio, %, K ₇ coefficient, value range 0.05～0.2.

Among them, the percentage content of TFe in dust sludge iron carbon balls is 5-80%, the percentage content of carbon mass is 80-20%, and the sum percentage content of other elements is less than 30%. The compressive strength is greater than 1500N/piece, and the thermal expansion coefficient is less than 25%.

Among them, the inclination angle of the chute extends outwards, which is used to arrange the ore to the edge of the furnace throat, increase the amount of ore at the edge of the furnace throat, appropriately aggravate the edge, and reduce the erosion intensity of the gas flow at the edge after the addition of dust, mud, iron carbon balls.

Among them, reducing the area of the hearth tuyere is used to blow the central coke material column and increase the penetration of hot air in the furnace; increasing the blast volume into the furnace is used to improve the air permeability of the blast furnace dead material column and improve the antegrade state of the blast furnace.

Among them, due to the carbon content in dust sludge iron carbon balls, the amount of pulverized coal injection in the blast furnace is reduced to reduce the fuel ratio and fuel consumption; the oxygen content in the blast is increased to improve the combustion of pulverized coal and reduce fuel consumption. Consumption, while reducing the occurrence of bosh gas.

Among them, increasing the temperature of the hot air is used to increase the heat into the furnace and improve the combustion of pulverized coal.

Among them, the sulfur content in the furnace charge increases due to dust, mud iron carbon balls entering the furnace, and the slag alkalinity is increased, which is used to improve the desulfurization capacity of the blast furnace and improve the operation status of the blast furnace.

According to this method to operate the blast furnace, it is possible to make reasonable use of the new-type furnace charge dust mud iron carbon balls, and at the same time, it can achieve the purpose of stable and smooth operation of the blast furnace, low consumption and long life. The consumption is reduced by more than 3 kg, and the production cost per ton of iron is reduced by more than 5 yuan.

Detailed ways

The present invention is further illustrated by some examples below.

Describe below in conjunction with specific embodiment:

1. Embodiment 1 (1080m ³ blast furnace of a certain iron and steel plant is illustrated as an example)

1.1 Dust mud iron carbon ball performance

The basic physical and chemical properties of dust mud iron carbon spheres are shown in Table 1.

Table 1 Dust mud iron carbon ball performance, %

A blast furnace operation method using thermally consolidated carbon as a part of the charge. Dust mud iron carbon balls are used as a separate furnace charge instead of being mixed with other types of charge. The dust mud iron carbon balls used are The basic physical and chemical performance analysis is shown in Table 1, and it was smelted in a blast furnace.

1.2 Furnace material collocation form

The matching form of the blast furnace charge is shown in Table 2.

Table 2 Charge matching form, %

As an independent charge, the iron carbon balls of dust and mud are used as an independent charge, and the inclination of the chute is extended outward by 2°. The iron carbon balls of dust and mud are loaded into the silo, transported to the top tank of the blast furnace through the main belt, and passed through the bellless distributor. After the rotating chute is arranged at the specified position according to the material distribution system required by the invention, other charge materials are put into the furnace according to the specified charge system for blast furnace smelting. %, 12.0% for pellets, 4.0% for lump ore, 8.0% for dust sludge iron carbon balls, and 20.0% for ordinary metallurgical coke.

1.3 Changes in operating system

See Table 3 for changes in the blast furnace operating system.

Table 3 Changes in operating system

Dust and mud iron carbon balls are put into the blast furnace as an independent charge. In order to adapt to the smelting work of the new charge, the operation system of the blast furnace needs to be changed accordingly. On the basis of the original blast furnace, the area of the tuyere is reduced by 0.01m ² , and the air volume Increase 60m ³ /min, increase oxygen enrichment rate by 0.02%, reduce coal injection ratio by 4.0kg/t, increase air temperature by 22°C, and correspondingly increase slag alkalinity. Correspondingly adopt a weight edge operation system to adapt to the new blast furnace operation system.

1.4 Implementation effect of blast furnace

Table 4 shows the smelting effect of the blast furnace after the dust-sludge iron-carbon spheres are used as part of the furnace charge.

Table 4 Effect of blast furnace after implementation

When dust mud iron carbon balls are used as part of the blast furnace charge, this method can be used for blast furnace smelting, which can increase the output, reduce the fuel ratio, improve the utilization rate of gas, achieve the stable operation of the blast furnace, and finally achieve the effect and purpose of reducing the production cost of ironmaking .

2. Embodiment 2 (1080m ³ blast furnace in a steel plant is taken as an example)

2.1 Dust mud iron carbon ball performance

The basic physical and chemical properties of dust mud iron carbon balls are shown in Table 5.

Table 5 Dust mud iron carbon ball performance, %

A blast furnace operation method using dust sludge iron carbon spheres as part of the furnace charge. The dust sludge iron carbon spheres and coke are mixed into the furnace. The basic physical and chemical properties of the dust sludge iron carbon spheres used are shown in Table 5 for blast furnace smelting. .

2.2 Furnace material collocation form

See Table 6 for the matching form of the furnace charge into the blast furnace.

Table 6 Charge matching form, %

Mix dust, mud iron carbon balls and coke into the silo, extend the inclination angle of the chute outward by 4°, and transport it to the blast furnace top tank through the main belt, and use the bellless distributor and the rotary chute according to the distribution system required by the invention After being arranged at the designated location, other charge materials are put into the furnace according to the specified charging system for blast furnace smelting. The form of charge matching is determined according to the mass percentage of charge charges, among which sinter is 60.0%, pellets are 10.0%, Lump ore is 0.0%, dust sludge iron carbon ball is 10.0%, and ordinary metallurgical coke is 20.0%.

2.3 Changes in the operating system

See Table 7 for changes in the blast furnace operating system.

Table 7 Operating System Changes

Dust, mud iron carbon balls and coke are mixed into the blast furnace. In order to adapt to the smelting work of the new charge, the operation system of the blast furnace needs to be changed accordingly. On the basis of the original blast furnace, the area of the tuyere is reduced by 0.01m ² and the air volume is increased by 80m ³ /min, the oxygen enrichment rate increased by 0.01%, the coal injection ratio decreased by 6.0kg/t, the hot air temperature increased by 25°C, and the slag alkalinity increased accordingly, and the operation system of increasing central coking was adopted accordingly to adapt to the new blast furnace operation system.

2.4 Implementation effect of blast furnace

Table 8 shows the smelting effect of the blast furnace after the blast furnace adopts dust-sludge iron-carbon spheres as part of the charge.

Table 8 Effect of Blast Furnace Implementation

When dust mud iron carbon balls are used as part of the blast furnace charge, this method can be used for blast furnace smelting, which can increase the output, reduce the fuel ratio, improve the utilization rate of gas, achieve the stable operation of the blast furnace, and finally achieve the effect and purpose of reducing the production cost of ironmaking .

3 Embodiment 3 (a steel plant 2600m ³ blast furnace is taken as an example)

3 Dust mud iron carbon ball performance

The basic physical and chemical properties of dust mud iron carbon balls are shown in Table 9.

Table 9 Dust mud iron carbon ball performance, %

A blast furnace operation method using thermally consolidated carbon as a part of the charge. Dust mud iron carbon balls are used as a separate furnace charge instead of being mixed with other types of charge. The dust mud iron carbon balls used are The basic physical and chemical performance analysis is shown in Table 9, and it was smelted in a blast furnace.

3.2 Furnace material collocation form

See Table 10 for the matching form of the blast furnace charge.

Table 10 Charge matching form, %

As an independent charge, the iron carbon balls of dust and mud are used as an independent charge, and the inclination of the chute is extended outward by 3°. The iron carbon balls of dust and mud are loaded into the silo, transported to the top material tank of the blast furnace through the main belt, and passed through the bellless distributor. After the rotary chute is arranged at the specified position according to the material distribution system required by the invention, other charge materials are put into the furnace according to the specified charge system for blast furnace smelting. %, 0.0% for pellets, 0.0% for lump ore, 30.0% for dust sludge iron carbon balls, and 20.0% for ordinary metallurgical coke.

3.3 Changes in the operating system

See Table 11 for changes in the blast furnace operating system.

Table 11 Operating System Changes

Dust and mud iron carbon balls are put into the blast furnace as an independent charge. In order to adapt to the smelting work of the new charge, the operation system of the blast furnace needs to be changed accordingly. On the basis of the original blast furnace, the area of the tuyere is reduced by 0.02m ² , and the air volume Increase by 150m ³ /min, increase oxygen enrichment rate by 0.11%, reduce coal injection ratio by 6.0kg/t, increase air temperature by 25°C, and correspondingly increase slag alkalinity. Correspondingly adopt a weight edge operation system to adapt to the new blast furnace operation system.

3.4 Implementation effect of blast furnace

Table 12 shows the smelting effect of the blast furnace after the dust-sludge iron-carbon spheres are used as part of the furnace charge.

Table 12 Effect of Blast Furnace Implementation

When dust mud iron carbon balls are used as part of the blast furnace charge, this method can be used for blast furnace smelting, which can increase the output, reduce the fuel ratio, improve the utilization rate of gas, achieve the stable operation of the blast furnace, and finally achieve the effect and purpose of reducing the production cost of ironmaking .

4 Embodiment 4 (a steel plant 2600m ³ blast furnace is taken as an example)

4.1 Dust mud iron carbon ball performance

The basic physical and chemical properties of dust mud iron carbon balls are shown in Table 13.

Table 13 Dust mud iron carbon ball performance, %

A blast furnace operation method using dust sludge iron carbon spheres as part of the furnace charge. The dust sludge iron carbon spheres and coke are mixed into the furnace. The basic physical and chemical properties of the dust sludge iron carbon spheres used are shown in Table 13 for blast furnace smelting. .

4.2 Furnace material collocation form

See Table 14 for the matching form of the furnace charge into the furnace.

Table 14 Charge matching form, %

Mix dust, mud, iron carbon balls and coke into the silo, extend the inclination of the chute outward by 3°, and transport it to the top tank of the blast furnace through the main belt, and use the bellless distributor and the rotary chute according to the distribution system required by the invention After being arranged at the designated location, other charge materials are put into the furnace according to the specified charging system for blast furnace smelting. The form of charge matching is determined according to the mass percentage of charge charges, among which sinter is 56.0%, pellets are 0.0%, Lump ore is 4.0%, dust sludge iron carbon ball is 20.0%, and ordinary metallurgical coke is 20.0%.

4.3 Changes in the operating system

See Table 15 for changes in the blast furnace operating system.

Table 15 Operating System Changes

Dust, mud iron carbon balls and coke are mixed into the blast furnace. In order to adapt to the smelting work of the new charge, the operation system of the blast furnace needs to be changed accordingly. On the basis of the original blast furnace, the area of the tuyere is reduced by 0.03m ² and the air volume is increased by 120m ³ /min, the oxygen enrichment rate increased by 0.10%, the coal injection ratio decreased by 8.0kg/t, the hot blast temperature increased by 30°C, and the slag alkalinity increased accordingly, and the operation system of increasing central coking was adopted accordingly to adapt to the new blast furnace operation system.

4.4 Implementation effect of blast furnace

Table 16 shows the smelting effect of the blast furnace after the dust-sludge iron-carbon spheres are used as part of the furnace charge.

Table 16 Effect of Blast Furnace Implementation

When using dust sludge iron carbon balls as part of the blast furnace charge, this method can be used for blast furnace smelting, which can increase the output, reduce the fuel ratio, improve the utilization rate of gas, achieve the stable operation of the blast furnace, and finally achieve the purpose of reducing the production cost of ironmaking .

5 Embodiment 5 (3800m ³ blast furnace of a certain iron and steel plant is illustrated as an example)

5.1 Dust mud iron carbon ball performance

The basic physical and chemical properties of dust mud iron carbon balls are shown in Table 17.

Table 17 Dust mud iron carbon ball performance, %

A blast furnace operation method using thermally consolidated carbon as a part of the charge. Dust mud iron carbon balls are used as a separate furnace charge instead of being mixed with other types of charge. The dust mud iron carbon balls used are The basic physical and chemical performance analysis is shown in Table 17, and it was smelted in a blast furnace.

5.2 Furnace material collocation form

See Table 18 for the matching form of the blast furnace charge.

Table 18 Charge matching form, %

As an independent charge, the iron carbon balls of dust and mud are used as an independent charge, and the inclination of the chute is extended outward by 4°. The iron carbon balls of dust and mud are loaded into the silo, transported to the top material tank of the blast furnace through the main belt, and passed through the bellless distributor. After the rotary chute is arranged at the specified position according to the material distribution system required by the invention, other charge materials are put into the furnace according to the specified charge system for blast furnace smelting. %, 10.0% for pellets, 5.0% for lump ore, 20.0% for dust sludge iron carbon balls, and 20.0% for ordinary metallurgical coke.

5.3 Changes in the operating system

See Table 19 for changes in the blast furnace operating system.

Table 19 Operating System Changes

Dust and mud iron carbon balls are put into the blast furnace as an independent charge. In order to adapt to the smelting work of the new charge, the operation system of the blast furnace needs to be changed accordingly. On the basis of the original blast furnace, the area of the tuyere is reduced by 0.02m ² , and the air volume Increase by 130m ³ /min, increase oxygen enrichment rate by 0.12%, reduce coal injection ratio by 6.0kg/t, increase air temperature by 20°C, and correspondingly increase slag alkalinity. Correspondingly adopt a weight edge operation system to adapt to the new blast furnace operation system.

5.4 Implementation effect of blast furnace

The smelting effect of the blast furnace is shown in Table 20 after the blast furnace adopts dust-sludge iron-carbon spheres as part of the charge.

Table 20 Effect of blast furnace after implementation

When using dust sludge iron carbon balls as part of the blast furnace charge, this method can be used for blast furnace smelting, which can increase the output, reduce the fuel ratio, improve the utilization rate of gas, achieve the stable operation of the blast furnace, and finally achieve the purpose of reducing the production cost of ironmaking .

6 Embodiment 6 (3800m ³ blast furnace of a certain iron and steel plant is illustrated as an example)

The basic physical and chemical properties of dust mud iron carbon balls are shown in Table 21.

Table 21 Dust mud iron carbon ball performance, %

A blast furnace operation method using dust sludge iron carbon spheres as part of the furnace charge. The dust sludge iron carbon spheres and coke are mixed into the furnace. The basic physical and chemical properties of the dust sludge iron carbon spheres used are shown in Table 21 for blast furnace smelting .

6.2 Furnace Charge Matching Form

See Table 22 for the matching form of the furnace charge into the furnace.

Table 22 Charge matching form, %

Mix dust, mud iron carbon balls and coke into the silo, extend the inclination of the chute outward by 2.5°, and transport it to the blast furnace top tank through the main belt, and use the bellless distributor and the rotary chute according to the distribution system required by the invention After being arranged at the designated location, other charge materials are put into the furnace according to the specified charging system for blast furnace smelting. The form of charge matching is determined according to the mass percentage of charge charges, among which sinter is 60.0%, pellets are 5.0%, Lump ore is 0.0%, dust sludge iron carbon ball is 10.0%, and ordinary metallurgical coke is 20.0%.

6.3 Changes in the Operating System

See Table 23 for changes in the blast furnace operating system.

Table 23 Operating System Changes

Dust, mud iron carbon balls and coke are mixed into the blast furnace. In order to adapt to the smelting work of the new charge, the operation system of the blast furnace needs to be changed accordingly. On the basis of the original blast furnace, the area of the tuyere is reduced by 0.03m ² and the air volume is increased by 200m ³ /min, the oxygen enrichment rate increased by 0.10%, the coal injection ratio decreased by 7.0kg/t, the hot blast temperature increased by 30°C, and the slag alkalinity increased accordingly. Correspondingly, the operation system of increasing central coking was adopted to adapt to the new blast furnace operation system.

6.4 Implementation effect of blast furnace

The smelting effect of the blast furnace is shown in Table 24 after the blast furnace adopts dust-sludge iron-carbon spheres as part of the charge.

Table 24 Effect of Blast Furnace Implementation

When using dust sludge iron carbon balls as part of the blast furnace charge, this method can be used for blast furnace smelting, which can increase the output, reduce the fuel ratio, improve the utilization rate of gas, achieve the stable operation of the blast furnace, and finally achieve the purpose of reducing the production cost of ironmaking .

Claims (2)

1. a kind of method for operating blast furnace of dirt mud iron carbon ball as part furnace charge, it is characterised in that：Dirt mud iron carbon ball is as blast furnace With part material, chute inclination angle on the basis of original BF Design, to A ° of extension；By dirt mud iron carbon ball separately as a kind of stove Expect, into stove, percent mass ratio to be added and does not allow more than the 30% of quality of furnace charge percentage, feeding density charcoal amount reduces quality hundred It is the C that percent mass ratio is added in dirt mud iron carbon ball to divide ratio；And reducing lower part cupola well tuyere line product, air port area reduces ratio PA linear corresponding relations are presented in the two between accounting for total quality of furnace charge percentage with dirt mud iron carbon ball addition；Using furnace roof batch can After charging method charging, furnace throat edge is arranged into dirt mud iron carbon ball is about to using no bell swivel chute distributing mode, together When the cloth number of turns of the dirt mud iron carbon ball in furnace throat edge must not exceed 5 circles, furnace throat edge cloth doses must not exceed dirt mud iron The 1/3 of carbon ball furnace entering volume；While dirt mud iron carbon ball enters stove, lower part operating duty is adjusted, increases the blow rate required, blasts air quantity increasing It is the BW that percent mass ratio is added in dirt mud iron carbon ball to add ratio；Coal powder blowing amount is reduced, coal injection amount reduces ranging from dirt The SC of percent mass ratio is added in mud iron carbon ball；Increase oxygen content in air blast, oxygen content increase ranging from dirt mud iron carbon ball is added The CO of percent mass ratio, increases hot blast temperature, and percent mass ratio is added in hot blast temperature increase ranging from dirt mud iron carbon ball ST, increases basicity of slag, and the AI of percent mass ratio is added in basicity increase ranging from dirt mud iron carbon ball；

Its chute inclination angle extension angle is carried out by following formula：A °=0.5 °+DICB × K₁；Feeding density charcoal reduces mass percent Example is carried out by following formula：C=DICB × K₂；Air port area reduces ratio to be carried out by following formula：PA=DICB × K₃；It blasts Air quantity increases ratio to be carried out by following formula：BW=DICB × K₄；Coal injection amount reduces ratio and is carried out by following formula：SC= DICB×K₅；Oxygen content increases ratio and is carried out by following formula：CO=DICB × K₆；Hot blast temperature increase than press following formula into Row：ST=DICB × K₇；Basicity of slag increases ratio to be carried out by following formula：AI=DICB × K₈；

In formula：

DICB：Percent mass ratio, % is added in dirt mud iron carbon ball；A°：Chute inclination angle extension angle, °, K₁Coefficient, value range 3 ~8；C：Feeding density charcoal reduces percent mass ratio, %, K₂Coefficient, value range 0.2~0.4；PA：Air port area reduces ratio Example, %, K₃Coefficient, value range 0.1~0.3；BW：It blasts air quantity and increases ratio, %, K₄Coefficient, value range 0.2~0.4； SC：Coal injection amount reduces ratio, %, K₅Coefficient, value range 0.2~0.4；CO：Oxygen content increases ratio, %, K₆Coefficient, Value range 0.3~0.9；ST：Hot blast temperature increases ratio, %, K₇Coefficient, value range 0.1~0.3；AI：Basicity of slag increases Add ratio, %, K₈Coefficient, value range 0.05~0.2.

2. a kind of method for operating blast furnace of dirt mud iron carbon ball as part furnace charge, it is characterised in that：Dirt mud iron carbon ball is as blast furnace With part material, chute inclination angle on the basis of original BF Design, to A ° of extension；It is loaded in mixture with stove smelter coke is entered, when loading in mixture, 20% that percent mass ratio is no more than total furnace charge is added in dirt mud iron carbon ball；It is dirt mud that feeding density charcoal amount, which reduces percent mass ratio, The C of percent mass ratio is added in iron carbon ball；And lower part cupola well air port is reduced, air port area reduces ratio and is added with dirt mud iron carbon ball PA linear corresponding relations are presented in the two between amount accounts for total quality of furnace charge percentage；After being fed using furnace roof batch can charging method, Central coke stock column position is arranged into dirt mud iron carbon ball is about to using no bell swivel chute distributing mode, while ore is in furnace throat The cloth number of turns of edge everywhere must not exceed 3 circles；The 1/3 of ore furnace entering volume is must not exceed at the ore of furnace throat edge；In dirt mud While iron carbon ball enters stove, lower part operating duty is adjusted, increases the blow rate required, air quantity is blasted and increases ratio as the addition of dirt mud iron carbon ball The BW of percent mass ratio；Coal powder blowing amount is reduced, coal injection amount reduces ranging from dirt mud iron carbon ball and mass percent is added The SC of example；Increase oxygen content in air blast, oxygen content increase ranging from dirt mud iron carbon ball is added the CO of percent mass ratio, increases heat The ST of percent mass ratio is added in air temperature, hot blast temperature increase ranging from dirt mud iron carbon ball, increases basicity of slag, and basicity increases Ranging from the AI of percent mass ratio is added in dirt mud iron carbon ball；

Its chute inclination angle extension angle is carried out by following formula：A °=0.5 °+DICB × K₁；Feeding density charcoal reduces mass percent Example is carried out by following formula：C=DICB × K₂；Air port area reduces ratio to be carried out by following formula：PA=DICB × K₃；It blasts Air quantity increases ratio to be carried out by following formula：BW=DICB × K₄；Coal injection amount reduces ratio and is carried out by following formula：SC= DICB×K₅；Oxygen content increases ratio and is carried out by following formula：CO=DICB × 0.7K₆；Hot blast temperature increases than pressing following formula It carries out：ST=DICB × K₇；Basicity of slag increases ratio to be carried out by following formula：AI=DICB × K₈；

In formula：

DICB：Percent mass ratio, % is added in dirt mud iron carbon ball；A°：Chute inclination angle extension angle, °, K₁Coefficient, value range 3 ~8；C：Feeding density charcoal reduces percent mass ratio, %, K₂Coefficient, value range 0.1~0.3；PA：Air port area reduces ratio Example, %, K₃Coefficient, value range 0.1~0.3；BW：It blasts air quantity and increases ratio, %, K₄Coefficient, value range 0.1~0.3； SC：Coal injection amount reduces ratio, %, K₅Coefficient, value range 0.2~0.4；CO：Oxygen content increases ratio, %, K₆Coefficient, Value range 0.3~0.9；ST：Hot blast temperature increases ratio, %, K₇Coefficient, value range 0.1~0.3；AI：Basicity of slag increases Add ratio, %, K₈Coefficient, value range 0.05~0.2.