阅读说明：本技术 一种高炉炉壳与冷却壁之间气隙检测方法 (Method for detecting air gap between blast furnace shell and cooling wall ) 是由 车玉满 姜喆 刘炳南 张辉 张立国 李金莲 于 2020-05-29 设计创作，主要内容包括：本发明涉及一种高炉炉壳与冷却壁之间气隙检测方法,1)选取铁口区域正下方1m～2m,铁口两侧2m范围内左右各2块冷却壁,在每2块冷却壁交界处钻孔,钻孔透过炉壳钢板；2)在每个钻孔上焊接钢质导管；3)在每个导管距炉壳80mm～96mm距离之间安装1个流量计和1个压力计,流量计和压力计与高炉控制室一级计算机系统终端通信连接,在二级计算机系统中实时在线显示监测点煤气泄露的流量和压力；4)当压力数据和流量数据均大于0时,判定该点存在气隙。本发明在线测量铁口以下重点区域炉壳和冷却壁之间压力和气体流量,准确判断炉壳与冷却壁之间是否存在气隙。避免人工测量发生煤气中毒事件。(The invention relates to a method for detecting an air gap between a blast furnace shell and a cooling wall, which comprises the following steps of 1) selecting 2 cooling walls which are 1-2 m below an iron notch area and are arranged in the range of 2m at the two sides of the iron notch, drilling holes at the junction of each 2 cooling walls, and enabling the drilled holes to penetrate through a furnace shell steel plate; 2) welding a steel guide pipe on each drill hole; 3) installing 1 flowmeter and 1 pressure gauge between each guide pipe and the furnace shell at a distance of 80-96 mm, wherein the flowmeters and the pressure gauges are in communication connection with a first-level computer system terminal of a blast furnace control room, and displaying the flow and the pressure of gas leakage at a monitoring point on line in a second-level computer system in real time; 4) when the pressure data and the flow data are both larger than 0, the air gap at the point is judged to exist. The invention can measure the pressure and gas flow between the furnace shell and the cooling wall in the key area below the taphole on line and accurately judge whether an air gap exists between the furnace shell and the cooling wall. The coal gas poisoning accident caused by manual measurement is avoided.)

1. A method for detecting an air gap between a blast furnace shell and a cooling wall is characterized by comprising the following specific steps:

1) selecting 2 adjacent cooling walls which are 1-2 m below the taphole area and are arranged in the range of 2m at the two sides of the taphole, drilling holes at the junctions of the 2 cooling walls, and enabling the drilled holes to penetrate through a furnace shell steel plate;

2) welding a steel guide pipe on each drill hole;

3) installing 1 flowmeter and 1 pressure gauge between each guide pipe and the furnace shell at a distance of 80-96 mm, wherein the flowmeters and the pressure gauges are in communication connection with a first-level computer system terminal of a blast furnace control room, and displaying the flow and the pressure of gas leakage at a monitoring point on line in a second-level computer system in real time;

4) when the pressure data and the flow data are both larger than 0, the air gap at the point is judged to exist.

2. The method for detecting the air gap between the blast furnace shell and the cooling wall according to claim 1, wherein the diameter of the drilled hole in the step 1) is phi 8mm to phi 10 mm.

3. The method for detecting the air gap between the blast furnace shell and the cooling wall as claimed in claim 1, wherein the diameter of the conduit in the step 2) is phi 10mm to phi 12mm, and the length of the conduit is more than 96 mm.

Technical Field

The invention relates to the field of smelting, in particular to a method for detecting an air gap between a blast furnace shell and a cooling wall.

Background

Once the potential safety hazard of the existing large-scale blast furnace occurs, the blast furnace is forced to adopt measures of reducing smelting intensity and special furnace protection without adopting measuresOnly the production efficiency of the blast furnace is reduced, and the production cost is increased. The service life of the first-generation blast furnace of most enterprises in China is generally less than 12 years, and the unit furnace volume output is less than 10000t/m³The service life of the first generation furnace is 20 years and the unit furnace capacity output is 15000t/m³There are great differences.

The blast furnace damage investigation discovers that the blast furnace damage is local at present and is concentrated in the range of the 2 nd section 4 cooling walls under the taphole. The detection data analysis of the blast furnace which has a hearth burnthrough accident and the blast furnace with potential safety hazard shows that the side wall temperature of the hearth has the phenomena of periodic higher and continuous rise, and the safe production of the blast furnace is seriously threatened. The periodic high temperature phenomenon appears on the side wall of the hearth, and most of the periodic high temperature phenomenon is related to the air gap between the furnace shell and the cooling wall of the blast furnace.

The existence of air gaps seriously influences the integrity of a hearth lining heat transfer system, and because the air gap heat transfer capacity is extremely low, even if the hearth lining uses the optimal carbon bricks, the cooling water system has the maximum water quantity and the best water quality, the heat in the hearth cannot be transferred to a cooling wall, the heat accumulated in the furnace cannot be taken away by the cooling water, and the abnormal erosion of the carbon bricks is accelerated as a result. However, no effective method and means for directly detecting the existence of the air gap between the furnace shell and the cooling wall exist so far, and after daily accumulation, potential safety hazards are caused to the blast furnace hearth, and even hearth burnthrough accidents occur.

The patent "method for detecting air gap of blast furnace shell" (patent No. CN201110342091.3) introduces that a model of blast furnace shell is built, the blast furnace shell is divided into a plurality of area units, reference configuration information is collected in the area units, reference temperature is measured, and a reference heat exchange coefficient of the model of blast furnace shell is obtained by using a finite element method based on the reference configuration information. And then calculating to obtain the heat exchange coefficient of the furnace shell of the blast furnace at the current moment according to the temperature measured on site, comparing the on-site heat exchange coefficient with the reference heat exchange coefficient, and if the difference between the on-site heat exchange coefficient and the reference heat exchange coefficient is large, determining that an air gap exists in the furnace shell. The patent adopts a mathematical model calculation method to judge the possibility of air gap existence, but the air gap cannot be measured for enterprises which do not have the function of establishing a blast furnace shell model.

The patent "blast furnace stove outer covering air gap judgement device of ironmaking" (patent number CN200420026764.X) introduces: the device is composed of two thermocouples, a data acquisition system and a computer, wherein the two thermocouples positioned at different positions inside a carbon brick of the furnace wall of the blast furnace are respectively connected to an input terminal of the data acquisition system, the data acquisition system is connected with the computer, and the carbon brick thermocouple is used for detecting data to indirectly judge whether a gap exists in the furnace wall of the blast furnace. The patent adopts a mathematical calculation method to judge the existence possibility of the air gap, but does not relate to a method for directly measuring the air gap.

The document "treatment of abnormal temperature rise of blast furnace hearth side wall of Angang No. 1" (the authors: Livicejie, Wangxuefeng, Zhang Xigang, iron-making 2015 5). The working personnel measure the temperature of the furnace shell at the hearth part by using an infrared temperature measuring gun on site, after the abnormal rising phenomenon is found, the personnel are arranged to check the grouting holes one by one, and if the gas discharge phenomenon exists in the grouting holes, the conclusion that a gap exists between the cooling wall and the carbon bricks is obtained. The method adopted in this document requires manual operations and lacks continuity.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for detecting an air gap between a furnace shell and a cooling wall of a blast furnace, which can accurately and continuously measure and judge the air gap between the furnace shell and the cooling wall in a key area below a taphole on line, guide maintenance personnel of the blast furnace to take measures and eliminate the air gap and the harm caused by the air gap.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for detecting an air gap between a blast furnace shell and a cooling wall comprises the following specific steps:

1) selecting 2 adjacent cooling walls at the left and right within the range of 1-2 m under the taphole area and 2m at two sides of the taphole, drilling a hole phi 8-phi 10mm at the junction of each 2 cooling walls, and drilling the hole to penetrate through a furnace shell steel plate;

2) welding a steel conduit with the diameter of 10 mm-12 mm on each drill hole, wherein the length of the conduit is more than 96 mm;

3) installing 1 flowmeter and 1 pressure gauge between each guide pipe and the furnace shell at a distance of 80-96 mm, wherein the flowmeters and the pressure gauges are in communication connection with a first-level computer system terminal of a blast furnace control room, and displaying the flow and the pressure of gas leakage at a monitoring point on line in a second-level computer system in real time;

4) when the pressure data and the flow data are both larger than 0, the air gap at the point is judged to exist.

Compared with the prior art, the invention has the beneficial effects that:

the invention can measure the pressure and gas flow between the furnace shell and the cooling wall in the key area below the taphole on line and accurately judge whether an air gap exists between the furnace shell and the cooling wall. The coal gas poisoning accident is avoided when the air gap between the furnace shell and the cooling wall is manually measured, and the safety of personnel is ensured. Can guide the maintenance personnel of the blast furnace to maintain the blast furnace and eliminate potential safety hazard.

Detailed Description

The invention is further illustrated by the following examples:

the following examples describe the invention in detail. These examples are merely illustrative of the best embodiments of the present invention and do not limit the scope of the invention.

A method for detecting an air gap between a blast furnace shell and a cooling wall comprises the following specific steps:

1) selecting 2 cooling walls at the left and right within the range of 1-2 m under the taphole area and 2m at two sides of the taphole, drilling a hole phi 8-phi 10mm at the junction of each 2 cooling walls, and drilling a hole to penetrate through a furnace shell steel plate;

2) welding a steel conduit with the diameter of 10 mm-12 mm on each drill hole, wherein the length of the conduit is more than 96 mm;

3) installing 1 flowmeter and 1 pressure gauge between each guide pipe and the furnace shell at a distance of 80-96 mm, wherein the flowmeters and the pressure gauges are in communication connection with a first-level computer system terminal of a blast furnace control room, and displaying the flow and the pressure of gas leakage at a monitoring point on line in a second-level computer system in real time;

4) when the pressure data and the flow data are both larger than 0, judging that an air gap exists at the point; the larger the pressure and flow data, the larger the air gap.

The method can guide the maintenance personnel of the blast furnace to plug the gas leakage point according to the test position, eliminate the air gap between the furnace shell and the cooling wall, reduce the erosion of the air gap to the carbon brick of the furnace hearth and prolong the service life of the first-generation furnace of the blast furnace.