阅读说明：本技术 一种消化炉缸死焦堆肥大的操作方法 (Operating method for large dead coke compost in digestion furnace hearth ) 是由 杨雷 魏开庆 马振军 王雪朋 张辉 王连昌 弭希雨 于 2020-12-28 设计创作，主要内容包括：本发明公开了一种消化炉缸死焦堆肥大的操作方法,包括以下步骤：上部装料制度采取减轻矿带负荷的布料方式,以矿带负荷≤7.0为基准；由于死焦堆肥大,中心焦炭量控制在10-15％即可；边缘矿带负荷控制在4-4.5；操作上W值控制在0.6以上；全风口送风,全风口均匀喷吹；喷煤比控制在140-150kg/t；4个铁口的高炉,采取三铁口循环出铁模式；采取稳定的原燃料支撑,强化筛分,≤5mm入炉矿石粉末低于1.5％；生铁含硅控制在0.35-0.55％,生铁含硫控制范围0.025-0.4％进行炉渣碱度的调剂,铁水物理热≥1510℃,用渣铁进行洗炉。本发明可以实现高炉稳产低耗的基础上逐步消化炉缸。(The invention discloses an operation method for large dead coke compost in a digestion furnace vat, which comprises the following steps: the upper charging system adopts a material distribution mode for reducing the load of the ore belt, and the load of the ore belt is less than or equal to 7.0 as a reference; the dead coke pile is large, and the central coke quantity is controlled to be 10-15%; controlling the load of the edge ore belt to be 4-4.5; the W value is controlled to be above 0.6 in operation; the full air port supplies air, and the full air port blows uniformly; the coal injection ratio is controlled at 140-150 kg/t; a blast furnace with 4 tapholes adopts a ferroferric taphole circulating tapping mode; adopting stable raw fuel for supporting, strengthening and screening, wherein the ore powder entering the furnace with the grain size less than or equal to 5mm is less than 1.5 percent; regulating the basicity of slag by controlling the silicon content in pig iron to 0.35-0.55% and the sulfur content in pig iron to 0.025-0.4%, and washing the furnace by using slag iron at the temp. of molten iron greater than or equal to 1510 deg.C. The invention can gradually digest the furnace hearth on the basis of realizing stable production and low consumption of the blast furnace.)

1. An operation method for large dead coke compost in a digestion furnace vat is characterized by comprising the following steps:

(1) the upper charging system adopts a material distribution mode for reducing the load of the ore belt, and reduces the coal gas resistance and the blast furnace pressure difference by taking the ore belt load less than or equal to 7.0 as a reference;

(2) the central air flow is weakened frequently due to the hypertrophy of the dead coke pile, and the central coke amount is not easy to be excessive and is controlled to be 10-15 percent;

(3) the edge should be loose, and the load of the edge ore belt is controlled to be 4-4.5;

(4) the W value is controlled to be more than 0.6 in operation;

(5) the air supply system supplies air through a full air port, and the full air port blows uniformly; the coal injection ratio is controlled at 140-150 kg/t;

(6) the tapping organization is the key, and the blast furnace with 4 tapholes adopts a ferroferric taphole circulating tapping mode to realize uniform, continuous and stable tapping;

(7) adopting stable raw fuel for supporting, and performing reinforced screening, wherein the ore powder entering the furnace with the grain size less than or equal to 5mm is less than 1.5%;

(8) regulating the basicity of slag at 0.35-0.55% of silicon contained in pig iron and 0.025-0.4% of sulfur contained in pig iron, and washing the furnace with slag iron at the temp. greater than or equal to 1510 deg.C.

2. The method for operating the dead coke compost of the digester hearth according to claim 1, wherein: in the step (6), the key point of control is that the tapping speed is not less than the molten iron production speed; an overlapping tapping mode is adopted, and the sunrise time is controlled to be 1600-1700 min.

Technical Field

The invention relates to an operation method in the field of metallurgy, in particular to an operation method for large dead coke compost in a digestion furnace hearth.

Background

With the enlargement of the domestic blast furnace at present, the diameter of the hearth is correspondingly enlarged, and the volume of the domestic blast furnace exceeds 5000m3 at present reaches 8. The diameter of the blast furnace hearth above 5000 grades is generally 14-15m, and the diameter of the blast furnace hearth above 3000 grades in China also exceeds 13 m. The depth of the corresponding tuyere raceway is about 2m generally, so that the area which can not be reached by the air quantity in the furnace hearth often exceeds 10 m. When external equipment faults cause long-term damping down or improper operation, abnormal furnace temperature alkalinity control, frequent pipeline airflow and the like, and abnormal conditions of the blast furnace, dead coke piles in a furnace cylinder are enlarged, the air quantity and the yield of the blast furnace are reduced, the consumption of the coke ratio, the fuel ratio and the like is increased, and huge loss is caused.

The traditional method for treating the large dead coke compost in the hearth gradually washes out iron slag in the dead coke compost in the hearth by generating slag with low melting point, such as: adding a furnace washing agent such as manganese ore, fluorite or soaking furnace slag and the like to the cloth for washing the furnace. However, the process of washing the furnace often brings about abnormal erosion of the carbon bricks in the furnace hearth, which is contrary to the pursuit of long service life of domestic blast furnaces.

Disclosure of Invention

The invention aims to provide an operation method for large dead coke compost in a digestion furnace hearth, which can gradually digest the furnace hearth on the basis of stable yield and low consumption of a blast furnace, simultaneously can avoid abnormal erosion of carbon bricks caused by using a furnace washing agent in the furnace hearth, and prolongs the service life of the blast furnace.

The technical scheme adopted by the invention for solving the technical problems is as follows: an operation method for large dead coke compost in a digestion furnace hearth comprises the following steps:

(1) the upper charging system adopts a material distribution mode for reducing the load of the ore belt, and reduces the coal gas resistance and the blast furnace pressure difference by taking the ore belt load less than or equal to 7.0 as a reference;

(2) the central air flow is weakened frequently due to the hypertrophy of the dead coke pile, and the central coke amount is not easy to be excessive and is controlled to be 10-15 percent;

(3) the edge should be loose, and the load of the edge ore belt is controlled to be 4-4.5;

(4) the W value is controlled to be more than 0.6 in operation;

(5) the air supply system supplies air through a full air port, and the full air port blows uniformly; the coal injection ratio is controlled at 140-150 kg/t;

(6) the tapping organization is the key, and the blast furnace with 4 tapholes adopts a ferroferric taphole circulating tapping mode to realize uniform, continuous and stable tapping;

(7) adopting stable raw fuel for supporting, and performing reinforced screening, wherein the ore powder entering the furnace with the grain size less than or equal to 5mm is less than 1.5%;

(8) regulating the basicity of slag at 0.35-0.55% of silicon contained in pig iron and 0.025-0.4% of sulfur contained in pig iron, and washing the furnace with slag iron at the temp. greater than or equal to 1510 deg.C.

Further, in the step (6), the key point of control is that the tapping speed is not less than the molten iron production speed; an overlapping tapping mode is adopted, and the sunrise time is controlled to be 1600-1700 min.

The invention has the following beneficial effects: the operation method for large dead coke compost in the digestion furnace hearth can gradually digest the furnace hearth on the basis of stable yield and low consumption of the blast furnace, can avoid abnormal erosion of carbon bricks caused by using a furnace washing agent in the furnace hearth, and prolongs the service life of the blast furnace.

Detailed Description

An operation method for large dead coke compost in a digestion furnace hearth comprises the following steps:

(1) the upper charging system adopts a material distribution mode of reducing ore belt load (the ore belt load is the ratio of ore weight/coke weight arranged on the same angle), and reduces coal gas resistance and blast furnace pressure difference by taking the ore belt load less than or equal to 7.0 as a reference;

(2) the central air flow is weakened frequently due to the hypertrophy of the dead coke pile, and the central coke amount is not easy to be excessive and is controlled to be 10-15 percent;

(3) the edge should be loose, and the load of the edge ore belt is controlled to be 4-4.5;

(4) the upper W value (namely the average value of the temperature of the cross temperature measuring edge/the average value of the top temperature) is controlled to be more than 0.6;

(5) the air supply system supplies air through a full air port, and the full air port blows uniformly; the coal injection ratio is controlled at 140-150 kg/t;

(6) the tapping organization is the key, and the blast furnace with 4 tapholes adopts a ferroferric taphole circulating tapping mode to realize uniform, continuous and stable tapping;

(7) adopting stable raw fuel for supporting, and performing reinforced screening, wherein the ore powder entering the furnace with the grain size less than or equal to 5mm is less than 1.5%;

(8) regulating the basicity of slag at 0.35-0.55% of silicon contained in pig iron and 0.025-0.4% of sulfur contained in pig iron, and washing the furnace with slag iron at the temp. greater than or equal to 1510 deg.C.

In the step (6), the key point of control is that the tapping speed is not less than the molten iron production speed; an overlapping tapping mode is adopted, and the sunrise time is controlled to be 1600-1700 min.