阅读说明：本技术 一种高炉炉墙结厚的检测方法 (Method for detecting blast furnace wall junction thickness ) 是由 刘栋梁 张正东 肖志新 卢正东 胡正刚 余珊珊 李红 于 2020-06-28 设计创作，主要内容包括：本发明公开了一种高炉炉墙结厚的检测方法,应用于高炉中,高炉包括多段壁体,壁体包括冷却壁,冷却壁热面附着有渣皮,冷却壁内填充有冷却水,且沿周向间隔设置有多个冷却壁测温点,所述方法包括：针对于单个所述冷却壁测温点,获取渣皮热面到冷却壁测温点的第一热流强度；获取冷却壁测温点到冷却水接触面的第二热量强度；基于第一热流强度及第二热量强度相等的原理,得到壁体在冷却壁测温点处的渣皮厚度；基于壁体在每个冷却壁测温点处的渣皮厚度,确定壁体是否结厚,本申请基于实时的热流强度得到的渣皮厚度进而判断壁体是否结厚的方式,相对于现有技术来说,能够及时得到壁体的结厚状况,便于操作人员及时进行炉况调剂。(The invention discloses a method for detecting the wall thickness of a blast furnace, which is applied to the blast furnace, wherein the blast furnace comprises a multi-section wall body, the wall body comprises a cooling wall, the hot surface of the cooling wall is attached with slag crust, the cooling wall is filled with cooling water, and a plurality of cooling wall temperature measuring points are arranged at intervals along the circumferential direction, and the method comprises the following steps: aiming at a single cooling wall temperature measuring point, obtaining first heat flow intensity from a slag crust hot surface to the cooling wall temperature measuring point; acquiring second heat intensity from a cooling wall temperature measuring point to a cooling water contact surface; obtaining the thickness of the slag crust of the wall body at the temperature measuring point of the cooling wall based on the principle that the first heat flow intensity and the second heat flow intensity are equal; whether the wall body is thick is confirmed to knot based on the slag crust thickness of wall body at every stave temperature measurement point department, and whether the mode that the wall body is thick is judged to the slag crust thickness that this application obtained based on real-time heat flux intensity, for prior art, can in time obtain the thick situation of knot of wall body, the operating personnel of being convenient for in time carries out the furnace condition and transfers the agent.)

1. The method for detecting the wall junction thickness of the blast furnace is characterized by being applied to the blast furnace, wherein the blast furnace comprises a plurality of sections of wall bodies which are sequentially arranged from bottom to top, each wall body comprises a cooling wall, a slag crust is attached to the hot surface of the cooling wall, cooling water is filled in the position, away from the hot surface of the cooling wall, and a plurality of cooling wall temperature measuring points are arranged at the position, close to the hot surface of the cooling wall, of the cooling wall at intervals along the circumferential direction, and the method comprises the following steps:

aiming at a single cooling wall temperature measuring point, acquiring a first heat flow intensity from the slag crust hot surface to the cooling wall temperature measuring point, wherein the first heat flow intensity is an unknown quantity carrying the slag crust thickness of the wall body at the cooling wall temperature measuring point;

acquiring second heat intensity from the temperature measuring point of the cooling wall to a cooling water contact surface, wherein the cooling water contact surface is the contact surface between the cooling wall and the cooling water;

obtaining the thickness of the slag crust of the wall body at the temperature measuring point of the cooling wall based on the principle that the first heat flow intensity and the second heat flow intensity are equal;

and determining whether the wall body is thick or not based on the thickness of the slag crust of the wall body at each temperature measuring point of the cooling wall.

2. The method of claim 1, wherein the obtaining a first heat flow intensity from the hot surface of the slag crust to the stave temperature measurement point comprises:

obtaining the temperature t of the hot surface of the slag crust_gThe temperature t of the temperature measuring point of the cooling wall_cThe heat transfer distance from the hot surface of the cooling wall to the temperature measuring point of the cooling wall in the thickness direction_cThe thermal conductivity lambda of the cooling wall_Wall(s)The thickness of the slag crust of the wall body at the temperature measuring point of the cooling wall_sThe thermal conductivity coefficient lambda of the slag crust_sThe convective heat transfer coefficient a between the slag crust hot surface and the furnace gas_h；

Based on the equationObtaining the first heat flow intensity q from the slag crust hot surface to the cooling wall temperature measuring point₁。

3. The method of claim 2, wherein the obtaining of the temperature t of the hot face of the slag crust is performed_gThe method comprises the following steps:

obtaining the furnace top temperature t of the blast furnace top_{Top roof}Theoretical combustion temperature t of the blast furnace_{Theory of things}The distance l from the slag crust hot surface position of the wall body at the temperature measuring point of the cooling wall to the furnace top_{Top roof}The distance l from the tuyere of the blast furnace to the furnace top;

based on the equationObtaining the temperature t of the hot surface of the slag crust_g。

4. The method of claim 2, wherein the obtaining of the thermal conductivity λ of the slag crust is performed by_sThe method comprises the following steps:

when the blast furnace is in a down-line blowing-down period, collecting the slag crust on the hot surface of the cooling wall for detection to obtain the heat conductivity coefficient lambda of the slag crust_sOr is or

Carrying out reduction test by using the same raw fuel or pure reagent as the blast furnace to prepare a slag crust sample, and detecting the slag crust sample to obtain the heat conductivity coefficient lambda of the slag crust_s。

5. The method of claim 4, wherein said obtaining a second heat intensity from the stave temperature measurement point to the cooling water contact surface comprises:

obtaining the temperature t of the temperature measuring point of the cooling wall_cThe temperature t of the cooling water after heat exchange_wThe thermal conductivity lambda of the cooling wall_Wall(s)The heat transfer distance from the temperature measuring point of the cooling wall to the contact surface of the cooling wall and the cooling water₁The convective heat transfer coefficient a between the cooling water and the cooling wall_w；

Based on the equation

6. The method as claimed in claim 5, wherein said obtaining of the convective heat transfer coefficient a between said cooling water and said cooling wall_wThe method comprises the following steps:

based on the Ditus-Beltt formula

7. The method of claim 1, wherein prior to said determining whether the wall is thickened based on a thickness of a skin of the wall at each stave temperature measurement point, further comprising:

obtaining the thickness of the slag crust at each position of the wall body between the two adjacent cooling wall temperature measuring points based on the thickness of the slag crust at the two adjacent cooling wall temperature measuring points which are adjacently arranged on the wall body along the circumferential direction;

the determining whether the wall body is thick based on the thickness of the slag crust of the wall body at each cooling wall temperature measuring point comprises the following steps:

and determining whether the wall body is thick or not based on the thickness of the slag crust of the wall body at each cooling wall temperature measuring point and the thickness of the slag crust of the wall body at each position between the two adjacent cooling wall temperature measuring points.

8. The method of claim 7, wherein obtaining the thickness of the slag crust at each location of the wall between two adjacent stave temperature measurement points based on the thickness of the slag crust at the two adjacent stave temperature measurement points circumferentially disposed on the wall comprises:

based on the equation

9. The method of claim 7, wherein determining whether the wall is thickly built based on the thickness of the skin of the wall at each of the stave temperature measurement points and the thickness of the skin of the wall at locations between the two adjacent stave temperature measurement points comprises:

acquiring the thickness of the slag crust of the wall body at each cooling wall temperature measuring point and the total numerical value of the thickness of the slag crust of the wall body at each position between the two adjacent cooling wall temperature measuring points;

obtaining a first numerical value of the thickness of the slag crust of the wall body at the temperature measuring points of the cooling walls, wherein the thickness of the slag crust is greater than a preset thickness threshold value, and a second numerical value of the thickness of the slag crust of the wall body at each position between the two adjacent temperature measuring points of the cooling walls, wherein the thickness of the slag crust is greater than the preset thickness threshold value;

judging the first numerical value, the second numerical value and the total numerical value, and determining the proportion of the thickness of the slag crust greater than the preset thickness threshold;

and judging whether the ratio is greater than a preset ratio threshold value, if so, determining that the wall body is thick, and if not, determining that the wall body is not thick.

10. The method of claim 1, wherein after the determining whether the wall is thickened based on the thickness of the skin of the wall at each stave temperature measurement point, further comprising:

determining a plurality of values of junction thickness of junction thicknesses in the plurality of walls;

and when the knot thickness value is larger than a preset knot thickness threshold value, if the knot thickness value is larger than or equal to the preset knot thickness threshold value, determining the knot thickness of the blast furnace, and if the knot thickness value is smaller than the preset knot thickness threshold value, determining the knot thickness of the blast furnace.

Technical Field

The invention relates to the technical field of blast furnace smelting, in particular to a method for detecting the wall junction thickness of a blast furnace.

Background

Although modern large-scale blast furnaces already have high levels of mechanization and automation, the blast furnaces still do not get rid of the characteristics of a black box due to the complex and difficult direct measurement of internal physical changes and chemical reaction processes, and the operation of the blast furnaces still needs to be operated by experience. The analysis and judgment of the state of the blast furnace smelting process through a scientific method and quantitative data are very important for guiding the production operation of the blast furnace.

At present, the long-term stable smooth operation of a blast furnace is realized, the stability of the furnace shape is very critical, the furnace shape abnormity which has the greatest influence on the smooth operation of the blast furnace is accretion on the upper part of a furnace body and furnace wall accretions on the lower parts of the furnace body, the furnace wall accretions are more common, the blast furnace air quantity and the yield are reduced due to the furnace wall accretions, the fuel ratio is increased, and the long-time accretion thickness or the frequent accretion thickness can cause huge economic loss to iron and steel enterprises.

After the blast furnace is in the initial stage of service, the furnace walls of the furnace belly, the furnace waist and the lower part of the furnace body are mainly protected by cooling wall hot-surface slag crust, whether the furnace walls are thickened depends on the thickness of the slag crust, but the thickness of the slag crust in the normal production of the blast furnace cannot be directly measured. The traditional method for judging the furnace wall thickness by blast furnace operators is to judge according to the furnace type related parameter changes such as the water temperature difference of a cooling wall of a blast furnace, the temperature of a temperature measuring point of the cooling wall, the air quantity and the like, and the method is relatively lagged, inaccurate and easy to misjudge.

Therefore, the reasonable detection of the blast furnace slag skin thickness is very important for the long-term stable and smooth running of the blast furnace.

Disclosure of Invention

The embodiment of the application provides a detection method for the wall junction thickness of the blast furnace, which is vital to the long-term stable smooth operation of the blast furnace, and the blast furnace operator controls the furnace type according to the wall junction thickness of the blast furnace, so that the technical problems of blast furnace air quantity, yield reduction and fuel ratio increase caused by the wall junction thickness in the prior art can be solved.

The application provides the following technical scheme through an embodiment of the application:

a method for detecting the wall thickness of a blast furnace is applied to the blast furnace, the blast furnace comprises a plurality of sections of wall bodies which are sequentially arranged from bottom to top, each wall body comprises a cooling wall, a slag crust is attached to the hot surface of each cooling wall, cooling water is filled in the position, far away from the hot surface of each cooling wall, a plurality of cooling wall temperature measuring points are arranged at the position, close to the hot surface of each cooling wall, of each cooling wall at intervals along the circumferential direction, and the method comprises the following steps: aiming at a single cooling wall temperature measuring point, acquiring a first heat flow intensity from the slag crust hot surface to the cooling wall temperature measuring point, wherein the first heat flow intensity is an unknown quantity carrying the slag crust thickness of the wall body at the cooling wall temperature measuring point; acquiring second heat intensity from the temperature measuring point of the cooling wall to a cooling water contact surface, wherein the cooling water contact surface is the contact surface between the cooling wall and the cooling water; obtaining the thickness of the slag crust of the wall body at the temperature measuring point of the cooling wall based on the principle that the first heat flow intensity and the second heat flow intensity are equal; and determining whether the wall body is thick or not based on the thickness of the slag crust of the wall body at each temperature measuring point of the cooling wall.

In one embodiment, the obtaining a first heat flow intensity from the hot surface of the slag crust to the temperature measurement point of the cooling wall comprises: obtaining the temperature t of the hot surface of the slag crust_gThe temperature t of the temperature measuring point of the cooling wall_cThe heat transfer distance from the hot surface of the cooling wall to the temperature measuring point of the cooling wall in the thickness direction_cThe thermal conductivity lambda of the cooling wall_Wall(s)The thickness of the slag crust of the wall body at the temperature measuring point of the cooling wall_sThe thermal conductivity coefficient lambda of the slag crust_sThe convective heat transfer coefficient a between the slag crust hot surface and the furnace gas_h(ii) a Based on the equationObtaining the first heat flow intensity q from the slag crust hot surface to the cooling wall temperature measuring point₁。

In one embodiment, the temperature t of the hot surface of the slag crust is obtained_gThe method comprises the following steps: obtaining the furnace top temperature t of the blast furnace top_{Top roof}Theoretical combustion temperature t of the blast furnace_{Theory of things}The distance l from the slag crust hot surface position of the wall body at the temperature measuring point of the cooling wall to the furnace top_{Top roof}The distance l from the tuyere of the blast furnace to the furnace top; based on the equation

Obtaining the temperature t of the hot surface of the slag crust_g。

In one embodiment, the heat conductivity coefficient lambda of the slag crust is obtained_sThe method comprises the following steps: when the blast furnace is in a down-line blowing-down period, collecting the slag crust on the hot surface of the cooling wall for detection to obtain the heat conductivity coefficient lambda of the slag crust_sOr carrying out reduction test by using the same raw fuel or pure reagent as the blast furnace to prepare a slag crust sample, and detecting the slag crust sample to obtain the heat conductivity coefficient lambda of the slag crust_s。

In one embodiment, the obtaining the second heat intensity from the cooling wall temperature measuring point to the cooling water contact surface comprises: obtaining the temperature t of the temperature measuring point of the cooling wall_cThe temperature t of the cooling water after heat exchange_wThe thermal conductivity lambda of the cooling wall_Wall(s)The heat transfer distance from the temperature measuring point of the cooling wall to the contact surface of the cooling wall and the cooling water₁The convective heat transfer coefficient a between the cooling water and the cooling wall_w(ii) a Based on the equationObtaining the second heat intensity q from the temperature measuring point of the cooling wall to the contact surface of the cooling water₂。

In one embodiment, the heat convection coefficient a between the cooling water and the cooling wall is obtained_wThe method comprises the following steps: based on the Ditus-Beltt formulaObtaining the heat convection coefficient a between the cooling water and the cooling wall_wWherein, Nu-Nussel number, Re-Reynolds number, Pr-Prandtl number, λ_w-the thermal conductivity of the cooling water, d-the equivalent diameter of the cooling water channel.

In one embodiment, before the determining whether the wall is thick based on the thickness of the slag crust of the wall at each stave temperature measurement point, the method further comprises: obtaining the thickness of the slag crust at each position of the wall body between the two adjacent cooling wall temperature measuring points based on the thickness of the slag crust at the two adjacent cooling wall temperature measuring points which are adjacently arranged on the wall body along the circumferential direction; the determining whether the wall body is thick based on the thickness of the slag crust of the wall body at each cooling wall temperature measuring point comprises the following steps: and determining whether the wall body is thick or not based on the thickness of the slag crust of the wall body at each cooling wall temperature measuring point and the thickness of the slag crust of the wall body at each position between the two adjacent cooling wall temperature measuring points.

In one embodiment, obtaining the thickness of the slag crust at each position of the wall body between the two adjacent temperature measuring points of the cooling wall based on the thickness of the slag crust at the two adjacent temperature measuring points of the cooling wall arranged along the circumferential direction on the wall body comprises: based on the equationObtaining the thickness of the slag crust of the wall body at a first position K between the temperature measuring points of the two adjacent cooling walls, wherein the first position K is any position between the temperature measuring points of the two adjacent cooling walls,_K-the thickness of the crust of the wall at the first position K,_M-the thickness of the skin of the wall at the temperature measurement point M of the stave,_Nthickness of the slag crust of the wall body at the temperature measuring point N of the cooling wall,/_KM-the distance in the circumferential direction, l, of the stave temperature measurement point M from the first position K_MN-the distance between the cooling wall temperature measurement point M and the cooling wall temperature measurement point N in the circumferential direction, the cooling wall temperature measurement point M and the cooling wall temperature measurement point N being arranged along the circumferential directionAny two adjacent cooling wall temperature measurement points.

In one embodiment, the determining whether the wall is thickened based on the thickness of the slag crust of the wall at each of the stave temperature measurement points and the thickness of the slag crust of the wall at positions between the two adjacent stave temperature measurement points comprises: acquiring the thickness of the slag crust of the wall body at each cooling wall temperature measuring point and the total numerical value of the thickness of the slag crust of the wall body at each position between the two adjacent cooling wall temperature measuring points; obtaining a first numerical value of the thickness of the slag crust of the wall body at the temperature measuring points of the cooling walls, wherein the thickness of the slag crust is greater than a preset thickness threshold value, and a second numerical value of the thickness of the slag crust of the wall body at each position between the two adjacent temperature measuring points of the cooling walls, wherein the thickness of the slag crust is greater than the preset thickness threshold value; judging the first numerical value, the second numerical value and the total numerical value, and determining the proportion of the thickness of the slag crust greater than the preset thickness threshold; and judging whether the ratio is greater than a preset ratio threshold value, if so, determining that the wall body is thick, and if not, determining that the wall body is not thick.

In one embodiment, after the determining whether the wall is thick based on the thickness of the slag crust of the wall at each stave temperature measurement point, the method further comprises: determining a plurality of values of junction thickness of junction thicknesses in the plurality of walls; and when the knot thickness value is larger than a preset knot thickness threshold value, if the knot thickness value is larger than or equal to the preset knot thickness threshold value, determining the knot thickness of the blast furnace, and if the knot thickness value is smaller than the preset knot thickness threshold value, determining the knot thickness of the blast furnace.

One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

in the embodiment, a plurality of cooling wall temperature measurement points are circumferentially arranged along a wall body, and for each cooling wall temperature measurement point, a first heat flow intensity from a slag crust hot surface to the cooling wall temperature measurement point and a second heat intensity from the cooling wall temperature measurement point to a cooling water contact surface are obtained, and based on the principle that the first heat flow intensity and the second heat intensity are equal, the thickness of the slag crust of the wall body at the cooling wall temperature measurement point is obtained, and then the thickness of the slag crust of the wall body at each cooling wall temperature measurement point is obtained, so that whether the wall body is thick or not is comprehensively judged based on the thickness of the slag crust at each cooling wall temperature measurement point, and the method for judging whether the wall body is thick or not based on the thickness of the slag crust obtained by real-time heat flow intensity is capable of obtaining the thick state of the wall body in time, and is convenient for an operator to carry out furnace condition adjustment in time, and the method is provided, whether the wall body knot is thick is comprehensively judged to the cinder thickness of a plurality of cooling wall temperature measurement points that utilize circumference to set up, the cinder of avoiding appearing individual point is thick, just discern the thick condition of brickwork knot, the thick condition of more accurate discernment brickwork knot, and then avoid unnecessary furnace condition to transfer the agent operation, consequently, the thick blast furnace amount of wind, output reduction, the technical problem that fuel ratio rises that leads to of brickwork knot among the prior art is solved in this application, it is crucial to the long-term stable antecedent act of blast furnace.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a flow chart of a method for detecting the wall junction thickness of a blast furnace provided in the embodiment of the present application;

FIG. 2 is a schematic diagram of the thickness of the slag crust at each circumferential position of the section 8 provided in the second embodiment of the present application;

fig. 3 is a schematic diagram of the thickness of the slag crust at each circumferential position of the section 8 provided in the third embodiment of the present application.

Detailed Description

The embodiment of the application provides a detection method for the wall junction thickness of the blast furnace, which is vital to the long-term stable smooth operation of the blast furnace, and the blast furnace operator controls the furnace type according to the wall junction thickness of the blast furnace, so that the technical problems of blast furnace air quantity, yield reduction and fuel ratio increase caused by the wall junction thickness in the prior art can be solved.

In order to solve the technical problems, the general idea of the embodiment of the application is as follows:

in the embodiment, a plurality of cooling wall temperature measurement points are circumferentially arranged along a wall body, and for each cooling wall temperature measurement point, a first heat flow intensity from a slag crust hot surface to the cooling wall temperature measurement point and a second heat intensity from the cooling wall temperature measurement point to a cooling water contact surface are obtained, and based on the principle that the first heat flow intensity and the second heat intensity are equal, the thickness of the slag crust of the wall body at the cooling wall temperature measurement point is obtained, and then the thickness of the slag crust of the wall body at each cooling wall temperature measurement point is obtained, so that whether the wall body is thick or not is comprehensively judged based on the thickness of the slag crust at each cooling wall temperature measurement point, and the method for judging whether the wall body is thick or not based on the thickness of the slag crust obtained by real-time heat flow intensity is capable of obtaining the thick state of the wall body in time, and is convenient for an operator to carry out furnace condition adjustment in time, and the method is provided, whether the wall body knot is thick is comprehensively judged to the cinder thickness of a plurality of cooling wall temperature measurement points that utilize circumference to set up, the cinder of avoiding appearing individual point is thick, just discern the thick condition of brickwork knot, the thick condition of more accurate discernment brickwork knot, and then avoid unnecessary furnace condition to transfer the agent operation, consequently, the thick blast furnace amount of wind, output reduction, the technical problem that fuel ratio rises that leads to of brickwork knot among the prior art is solved in this application, it is crucial to the long-term stable antecedent act of blast furnace.

In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.