JPH06174646A - Measuring method of expansion of furnace body of coke furnace - Google Patents

Abstract

PURPOSE:To measure the amount of expansion of a furnace body at an arbitrary position in the direction of the furnace length and the direction of the coke oven battery of a coke furnace, with high precision and in a short time. CONSTITUTION:In a method for measuring the amount of expansion on the basis of measured dimensions and designed ones of a furnace body of a coke furnace, water- cooled and/or air-cooled lances 3 each having a camera or a distance meter incorporated are inserted into two places in a combustion chamber or a carbonization chamber respectively. With the lances 3 moved in the vertical direction, the amount of displacement in relation to the vertical line in the direction of a furnace length or a coke oven battery is measured, while a distance La between the lances 3 at the two places in the combustion chamber or the carbonization chamber is measured separately, and the amount of expansion of the furnace body is determined on the basis of measured values thus obtained and designed values. Accordingly, the true value of the amount of thermal expansion at an arbitrary position of the coke furnace can be known, a part of occurrence of slackening of the furnace body can be foreseen correctly and a proper repair of the furnace body can be executed early so that it corresponds to a state of occurrence of slackening of the furnace body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for directly measuring a furnace body expansion amount in an arbitrary section of a coke oven with high accuracy in a short time.

[0002]

2. Description of the Related Art Most coke ovens are constructed of silica stone bricks and clay bricks, and partially heat insulating bricks and red bricks are used. For this reason, in the coke oven, the back ties are vertically arranged at predetermined intervals along the furnace end retaining walls at both ends in the furnace group direction to protect the furnace body, and the cross tie rods are passed through the upper and lower two places of the opposing back tees. Back ties are vertically arranged at a predetermined interval along the furnace end wall in the furnace length direction, cross tie rods are passed through the upper and lower two places of the opposing back ties, and tightened with a predetermined load from both ends by a tightening mechanism such as a spring. The furnace bricks are tightened through the stay.

However, the coke oven is repeatedly charged with charcoal at room temperature and kiln of red hot coke at a temperature of more than 1000 ° C. for many years until it deteriorates and stops when it starts to operate. The total weight is 150
~ 300 tons of coal car travels back and forth tens to hundreds of times a day. Therefore, the coke oven will eventually reach the end of its life due to damage and loosening of the furnace body due to mechanical and thermal stresses that act in accordance with the carbonization cycle.

Since the cost of one renewal of the coke oven at present is very large, it is necessary to extend the life of the existing coke oven for the time being from the viewpoint of waiting for a medium-term judgment such as a study on a new inexpensive coke production method. It has become an important issue. Therefore, at present, it is important to measure which part of the furnace body of the coke oven is damaged and to what extent to evaluate the degree of deterioration, and to repair the coke oven at an appropriate timing. In this way, the furnace body expansion rate, which is one of the important evaluations of the degree of deterioration in the coke oven furnace body management, is such as the breakage of joints in the furnace body bricks, the intrusion of carbon into cracks, and the increase in external pressure during coke extrusion. It is believed that Generally, the furnace body expansion coefficient and the furnace age have a good correlation, and are important enough to be a guideline for the deterioration of the furnace body.

Conventionally, the furnace body of the above coke oven (in the furnace length direction)
The expansion rate is measured manually by Transit and Shokai 61.
Using a scale as shown in Japanese Patent Publication No. 39136, 4 to 5 locations in the furnace height direction of the carbonization chamber are measured approximately every six months. Measurement of the furnace body expansion rate by this transit and scale,
As shown in FIGS. 6 and 7, four reference points A are provided at the end of the coke oven 31, and a transit is installed at one of the reference points A at the end of the coke side and machine side furnace groups, and the other furnace is installed. The distances C ₁ and C ₂ between the reference lines B and B connecting the reference points A at the end of the group and the surface of the protective plate on the back of each backstay are measured using a scale, and the distances L _A between the reference lines B and B are used as a reference. Line B,
The initial length L ₀ is subtracted from the value obtained by subtracting the distances C ₁ and C ₂ between B and the surface of the protective plate on the back of each back stay and the thickness 2t of the protective plate on both sides to obtain the expansion amount E. It is divided by L ₀ and multiplied by 100 to obtain the expansion coefficient E _R (%). _{E = (L A -C 1 -C} 2 -2t) -L 0 E R = E / L 0 × 100

[0006]

The manual measurement of the furnace length using the above-mentioned transit and scale must be carried out during the kiln break in which the extruder, the coke guide car, etc. retreat from the periphery of the furnace group to a predetermined position. Moreover, the measurement takes a long time. In addition, since the influence of heat radiation from the coke oven and the furnace length are not directly measured but indirectly calculated by subtraction calculation, high accuracy in measurement cannot be obtained. Further, the measurement points are, as shown in FIG.
Since it is not the two ends but the surface of the brick presser protection plate 33 on the back of the back stay, if there is a space 34 between the end of the furnace brick 32 and the protection plate 33 due to expansion, it is impossible to accurately measure the furnace length dimension. It has drawbacks. Further, in the above-mentioned conventional method, since the expansion amount can be measured only from the end to the end in the furnace length direction (from the machine side to the coke side), the expansion amount can be determined in any section, that is, in which part in the furnace length direction. It's unclear if it is.

An object of the present invention is to provide a coke oven furnace body expansion measuring device which can measure the furnace body expansion amount in the furnace length direction and the furnace group direction of the coke oven with high accuracy and in a short time.

[0008]

Means for Solving the Problems The inventors of the present invention have made extensive studies to achieve the above object. As a result, paying attention to the fact that the vertical joints of the bricks of the coke oven are originally constructed vertically, water-cooled or air-cooled with built-in rangefinders or commercially available CCD cameras, etc. at any two flues in the combustion chamber. While inserting the lance from the top of the furnace and moving it vertically, for example, in the case of a built-in camera, know the amount of change (movement amount) between the top and bottom of the joint (vertical joint in this case) on the monitor screen and measure it separately. The inventors have found that the expansion amount can be grasped based on the distance between two lances, and that the expansion amount in an arbitrary section can be measured by selecting a flue into which the lance is inserted, and the present invention has been reached.

That is, the present invention relates to a method for measuring the expansion amount based on the measured furnace body size and design size of a coke oven, in which water-cooling and / or air-cooling lances with built-in distance meters are provided at two locations in the combustion chamber or carbonization chamber. Insert the lance, move the lance in the vertical direction, and measure the displacement with respect to the vertical line in the furnace length direction or furnace group direction.
The distance between the lances is measured separately, and the amount of expansion of the furnace body is calculated based on these measured values and design values.

Further, in the method of measuring the expansion amount based on the measured furnace body size and design size of the coke oven, water cooling and /
Or insert an air-cooling lance and measure the displacement on the monitor screen between the vertical direction of the brick vertical joint in the furnace length direction or furnace group direction while moving the lance vertically and convert it to the actual distance. Then, the distance between the two lances in the combustion chamber or the carbonization chamber is separately measured, and the amount of expansion of the furnace body is obtained based on these measured values and design values.

[0011]

According to the present invention, water cooling and / or air cooling lances with built-in rangefinders are inserted into two places in the combustion chamber or the carbonization chamber, and the lance is moved vertically while the vertical line extending in the furnace length direction or the furnace group direction. The displacement between the two lances of the combustion chamber or carbonization chamber,
Since the furnace body expansion amount is obtained based on these measured values and design values, the furnace body expansion amount in an arbitrary section can be measured, and the expansion in each part of the furnace body can be grasped. Also, insert water-cooling and / or air-cooling lances with built-in cameras into two places in the combustion chamber or carbonization chamber, and move the lances in the vertical direction while vertically moving the brick longitudinal joint in the furnace length direction or furnace group direction in the furnace height direction. Between the two lances of the combustion chamber or the carbonization chamber where is measured by measuring the amount of displacement on the monitor screen between them and converting it to the actual distance, and the furnace is based on these measured values and design values. Since the body expansion amount is obtained, the furnace body expansion amount in an arbitrary section can be measured, and the expansion amount in each part of the furnace body can be grasped.

The distance between the two lances in the present invention can be measured by an existing scale, a light wave distance meter (laser distance meter or the like), an ultrasonic distance meter or the like. If the lance has a built-in rangefinder, read the distances D ₁ and D ₂ from the two opposing lance-side partition walls or furnace walls, and read the distance L _b between the two insertion holes and the partition wall or Based on the design distance L _d between the furnace walls, the expansion amount E between the partition walls or between the furnace walls can be obtained by the following equation (1). E = L _b −D ₁ −D ₂ −L _d (1) When the lance has a built-in camera, the vertical direction on the monitor screen when two opposing lances are moved vertically from bottom to top The actual measured values D ₁₁ and D _{12 of the} amount of joint deviation and the brick thickness T _m on the monitor screen were measured, and the actual brick thickness _Tr , 2
The expansion amount E in the lance insertion space can be obtained by the following equation (2) based on the distance L _c between the lances at each position. _{E = [L c + T r} (D 11 + D 12) / T m] -L d (2) formula

The lance having the built-in rangefinder or camera may be moved up and down in the vertical direction by any method as long as the lance can be moved up and down in the vertical direction. For example, a movable carriage on the coke oven can be used. A vertical guide frame is provided, the lance is movably suspended along the guide frame with a wire or chain, the signal cable and the water-cooling or air-cooling hose are along the wire or chain, and the wire or chain is rewound or wound up. The lance is moved up and down by gravity, and the signal cable and the water-cooling or air-cooling hose are provided with a winding tension drum separately, so that the tension drum can be wound and rewound corresponding to the vertical movement of the lance. .

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for measuring the expansion amount of a coke oven according to the present invention will be described in detail below with reference to FIGS. FIG. 1 is a schematic diagram showing the principle of the furnace body expansion amount measurement of the present invention, FIG. 2 is a schematic diagram showing the principle of the furnace body expansion amount measurement by a lance having a built-in small camera, and FIG. 3 is a furnace wall monitor by the small camera. A screen, FIG. 4 is an enlarged cross-sectional view of a main part of a lance incorporating a small camera, and FIG. 5 is an enlarged cross-sectional view of a main part of a lance incorporating a small rangefinder. In FIG. 1, 1 is a coke oven, 2 is a combustion chamber of the coke oven 1, and the combustion chamber 2 has a No. 1-No. It is divided into 30 flues. Reference numeral 3 denotes an air-cooling and / or water-cooling lance having a built-in small camera, which is configured to be vertically movable in a vertical direction by an elevating mechanism on a movable carriage (not shown). No. 1 in FIG. 1 flue 4 and no. 28 flues 5
It shows the case of measuring the vertical expansion amount between the furnace walls of No. 1 flue 4 and no. Air cooling and / or water cooling lances 3 each having a built-in small camera are inserted into the 28 flues 5. No. 1 flue 4 and no.
The distance La between the centers of the flue holes of the 28 flue 5 is separately measured by a laser range finder, an ultrasonic range finder, a scale, or the like.

No. 1 flue 4 and no. The vertical expansion amount of the furnace wall in the 28 flue 5 was measured by
As shown in, the vertical joints on the screens of the monitors 6 and 6 at the same height position when the lances 3 and 3 are moved vertically from bottom to top (the vertical joints of bricks are originally constructed vertically). Of the actual brick thickness T _r , N by measuring the measured values D ₁₁ , D _12, the brick thickness T _m on the screens of _the monitors 6 and 6.
o. 1 flue 4 and no. Distance L _a between the flue hole centers of 28 flues 5, based on the design distance L _e, the expansion amount E in the lance insertion space, the equation (2), i.e. E = [L <sub>a
+ T r (D 11 + D</sub> 12) / T m] can be obtained by -L _e. When the lances 3 and 3 are equipped with small rangefinders, the distances D ₁ and D ₂ to the partition wall on the opposite lance side are read and No. 1 flue 4 and no. 28 flue based on the distance L _a and the partition walls of the design distance L _d between the flue hole center 5, the expansion amount E of the partition walls, the equation (1), i.e. E = L _a -D ₁ -D It can be calculated by _2- L _d .

The air-cooling and / or water-cooling lance 3 incorporating the small camera is air-cooled and / or water-cooled as shown in FIG.
Alternatively, the brick surface 9 reflected on the reflecting mirror 8 is photographed by the small camera 10 through the window of the quartz glass 7 provided at the lower end of the water cooling lance 3, and the small camera 10 and the monitor 6 are connected to the signal cable 11.
To connect. Or without going through the reflector 8,
Directly attach the brick surface 9 to the small camera 1 through the window of the quartz glass 7.
You can also shoot with 0. Further, as shown in FIG. 5, the air-cooling and / or water-cooling lance 3 having a built-in small distance meter is connected to the brick surface by the distance meter 13 through the window 12 with an air curtain provided at the lower end of the air-cooling and / or water-cooling lance 3. Measure the distance to 9 and distance meter 13 and distance indicator 1
4 are connected by a signal cable 15.

Therefore, in the method of the present invention, the coke oven 1 is arbitrarily selected by selecting the flue hole or the charging port into which the air-cooling and / or water-cooling lance 3 incorporating the small camera 10 or the small rangefinder 13 is inserted. It is possible to measure the true value of the amount of thermal expansion in the furnace height direction at a certain position, and to accurately predict the site where the furnace body is deteriorated due to the damage or falling of the furnace brick due to the relaxation of the furnace body. .

[0018]

As described above, according to the method of the present invention, the coke oven is selected by arbitrarily selecting the flue hole or the charging port into which the air-cooling and / or water-cooling lance having the small camera or the small rangefinder is inserted. It is possible to grasp the true value of the thermal expansion amount in the furnace height direction at any position. For this reason,
It is possible to accurately predict the location of the loosening of the furnace body, and to perform proper repair of the furnace body early in response to the situation of the loosening of the furnace body, which is extremely useful in preventing the deterioration of the furnace body of the coke oven. It is valid.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the principle of measurement of a furnace body expansion amount according to the present invention.

FIG. 2 is a schematic diagram showing the principle of furnace body expansion measurement by a lance incorporating a small camera.

FIG. 3 is an explanatory diagram of a furnace wall monitor screen by a small camera.

FIG. 4 is an enlarged cross-sectional view of a main part of a lance incorporating a small camera.

FIG. 5 is an enlarged sectional view of an essential part of a lance incorporating a small rangefinder.

FIG. 6 is an explanatory diagram of a conventional measuring method using a transit and a scale.

FIG. 7 is an explanatory diagram of a measurement end when measuring with a conventional transit and scale.

[Explanation of symbols]

 1, 31 Coke oven 2 Combustion chamber 3 Water cooling and / or air cooling lance 4 No. 1 flue 5 No. 28 Flue 6 Monitor 7 Quartz glass 8 Reflector 9 Brick surface 10 Small camera 11, 15 Signal cable 12 Window 13 Small rangefinder 14 Distance indicator 32 Furnace brick 33 Protective plate A Reference point B Reference line

Claims (2)

[Claims] 1. A method for measuring an expansion amount based on a measured furnace body size and a design size of a coke oven, wherein water cooling and / or air cooling lances with built-in distance meters are inserted at two places in a combustion chamber or a carbonization chamber. While moving the lance in the vertical direction, the displacement amount with respect to the vertical line in the furnace length direction or the furnace group direction is measured, and the distance between the two lances in the combustion chamber or the carbonization chamber is separately measured. A furnace body expansion measuring method for a coke oven, characterized in that the furnace body expansion amount is obtained based on the value. 2. A method of measuring an expansion amount based on a measured furnace body size and a design size of a coke oven, wherein water cooling and / or air cooling lances with built-in cameras are inserted into two places in a combustion chamber or a carbonization chamber, While moving the lance in the vertical direction, the displacement amount on the monitor screen of the brick vertical joint in the furnace length direction or furnace group direction is measured and converted into the actual distance, and the distance between the two lances in the combustion chamber or the carbonization chamber is measured. Is separately measured, and the furnace body expansion amount is determined based on these measured values and design values.