JPH03259994A - Method for controlling carbonaceous material on coke oven wall - Google Patents

Abstract

PURPOSE:To realize the uniform deposition of carbonaceous material on a coke oven wall by controlling the quantity of an oxygen-containing gas sprayed based on the location of the wall where the carbonaceous material is deposited and the amount of the material deposited. CONSTITUTION:A detector 13 for the load on a rack beam 7 of a pusher 3 and a detector 14 for detecting the travel distance of the rack beam 7 are connected to a control device 15. When coke is pushed, the change in the load on the rack beam 7 with time and the travel distance of the rack beam 7 after the initiation of pushing are inputted from the detectors 13 and 14 to the device 15, the travel distance of the rack beam 7 is obtained based on the time elapsed until the load on the rack beam 7 reaches a peak, and the presence or absence of deposition of carbonaceous material and the location where it is deposited are determined from the relation between the distance and the end of the shrunk part of coke. When there is deposition of carbonaceous material, the quantity of an oxygen-containing low-pressure gas sprayed is determined based on the relation between the peak value of the load on the rack beam 7 and the quantity of the gas sprayed. The rack beam 7 is retreated and, when the detector 14 detects that nozzles 8, 9 have reached the location where the carbonaceous material is deposited, the rotational speed of a gas pumping device 10 is raised to spray a specified quantity of the oxygen-containing low-pressure gas.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for controlling furnace wall carbon that can uniformize the carbon deposited on the furnace wall of a coke oven carbonization chamber.

[Prior art] - Carbon produced by the thermal decomposition of coke oven gas generated during carbonization, or pulverized coal scattered during coal charging, adheres to the furnace walls of each part of the coke oven carbonization chamber and turns into coke. Carbon adheres to the surface.

This carbon deposited on the furnace wall closely closes the joints of the furnace wall bricks and has the function of preventing gas leakage from the carbonization chamber to the combustion chamber, and is therefore necessary to some extent. However, if left as is, it will grow and reduce the thermal conductivity of the furnace wall, reduce the effective volume of the coking chamber and reduce the productivity of the furnace, and furthermore, the extrusion resistance will increase and the coke will not be pushed. This can lead to stopping and clogging, which can cause damage to the furnace body. For this reason,
Adhered carbon must be removed periodically.

Various methods have been proposed to remove carbon adhering to the furnace walls, as described below.

■ Use a spear-like jig with a sharp tip and a length of 5 to 6 meters to remove it by dropping it manually.

■ A method in which a part of the top or side surface of the carbonization chamber is opened, and high-speed oxygen or air is injected through an injection nozzle installed in the carbonization chamber to swirl the inside of the carbonization chamber (Japanese Patent Laid-Open No. 6
1-21187).

■ After coke discharge is completed, coal is being charged into the previous carbonization chamber.
A method of opening a part of the upper surface or side surface of the discharged carbonization chamber and inserting an injection nozzle to inject oxygen-containing gas (Japanese Patent Laid-Open No. 61-231088).

■ A lance equipped with an injection nozzle is installed on a base that is movable along the carbonization chamber of the coke oven so that it can move forward and backward, and the discharge direction of the injection nozzle of the lance is positioned almost parallel to the side wall of the carbonization chamber. Device with a series of lances (Unexamined Japanese Patent Publication No. 62-1
61884).

■ Measuring changes in the load applied to the coke extruder over time,
A method of determining the distance traveled by the coke extruder during the elapsed time from the start of unloading the kiln at the peak value of the measured load, and detecting the position of carbon attached to the wall surface of the carbonization chamber based on this distance (Japanese Patent Laid-Open No. 62-34982 Publication No.).

Problems to be Solved by the Invention Among the conventional methods described above, the method of manually dropping the adhered carbon from the top of the furnace using a spear-shaped jig is a method in which the carbon layer is completely peeled off from the furnace wall, and the carbon layer is completely removed from the furnace wall. Not only does the sealing function of the joints become impaired, causing gas leaks from the carbonization chamber to the combustion chamber, but it also requires heavy physical labor under high heat, and during this work, unloading the kiln must be interrupted. I don't get it.

The method disclosed in Japanese Patent Application Laid-Open No. 61-21187 injects high-speed gas and swirls it inside the carbonization chamber, which makes it possible to remove carbon from the entire surface of the furnace wall to some extent. Since it rotates in the carbonization chamber, excessive carbon is removed in areas with less adhered carbon, impairing the sealing performance of joints.

Furthermore, during carbon burning, the inside of the carbonization chamber is exposed to high temperatures, which causes thermal distortion of the furnace lid and damage to joints due to temperature changes in the ceiling.

In addition, in the method described in JP-A No. 61-231088, the carbon adhering to the furnace wall of the air introduction section is initially burned and removed, and then cold air passes through, resulting in local supercooling of the bricks. Damage such as spalling may occur, and the sealing performance of joints may be impaired.

Furthermore, the method described in JP-A No. 62-161884 is effective for localized carbon removal with a small amount of supplied gas; Or, it is necessary to scan the entire furnace wall. However, arranging nozzles all over the furnace wall requires extremely large equipment, which is not practical, and scanning the entire furnace wall requires a large amount of time, which is not an efficient method.

Furthermore, the method of Japanese Patent Application Laid-open No. 62-34982,
This method detects the position of carbon adhering to the wall surface of the carbonization chamber, and in order to remove the adhering carbon, air is blown out only at the position where the carbon is adhering, and the carbon is burned off to eliminate unevenness on the wall surface and make it smooth. However, it has not yet been possible to control the air injection amount to make the deposited carbon uniform.

This invention was made in view of the above situation, and it is possible to uniformly and quickly remove carbon attached to the coke oven wall without requiring a large amount of capital investment, and to maintain the sealing properties of the oven wall. The present invention provides a method for controlling carbon.

Means for Solving the Problems As a result of various studies to solve the above problems, the present inventors found that
The inventors have discovered that the amount of carbon adhering to the coke oven wall can be made uniform by controlling the injection amount of oxygen-containing gas based on the adhesion position and amount of carbon adhering to the coke oven wall, and have arrived at the present invention.

In other words, this invention detects the presence or absence of carbon adhesion and the adhesion position based on the change over time in the load applied to the rack beam of a coke oven extruder, and detects the presence or absence of carbon adhesion and the adhesion position based on the carbon adhesion position and the peak load applied to the rack beam. The amount of oxygen-containing gas injected from the nozzle is continuously controlled.

In the present invention, the presence or absence of carbon adhesion and the detection of the adhesion position based on changes over time in the load applied to the rack beam of the coke oven extruder can be carried out, for example, by the method described in the above-mentioned Japanese Patent Application Laid-Open No. 62-34982.

That is, the coke in the carbonization chamber is compressed and packed in the coke extrusion direction by the ram head at the tip of the rack beam, and when the contracted portion reaches the coke side, the entire coke starts to move.

For this purpose, we measure the change over time in the load that the rack beam receives during coke extrusion, and calculate the distance the rack beam has moved based on the elapsed time from the start of extrusion to the peak value of the measured load. The presence or absence of carbon adhesion and the adhesion position can be detected from the relationship with the tip position of the finished portion.

In addition, the peak value of the load applied to the rack beam increases as the amount of attached carbon increases, so based on the relationship between the predetermined peak value of the load applied to the rack beam and the injection amount of oxygen-containing gas, It controls the amount of gas injected.

Furthermore, it is advantageous if the oxygen-containing gas is supplied to the injection nozzle provided in the rack beam through the hollow part of the rack beam or through a pipe provided separately, since adhering carbon can be removed during coke extrusion.

According to the present invention, the flow of oxygen-containing gas from the injection nozzle disposed on the rack beam is determined according to the presence or absence of carbon adhesion, the adhesion position, and the peak load applied to the rack beam, which are determined from changes over time in the load applied to the rack beam. Since the injection amount is continuously controlled, the load on the rack beam increases.In other words, the injection amount of oxygen-containing gas is increased at locations with a large amount of carbon adhesion, and decreased at other locations, which reduces the amount of carbon adhesion on the furnace wall. is made uniform, excessive removal of adhering carbon is prevented, and sealing performance is not impaired.

Moreover, since oxygen-containing gas is injected during coke extrusion, there is no need for time for carbon removal work, and the work time remains the same as in normal operation, making it possible to easily remove carbon.

In addition, if oxygen-containing gas is supplied to the injection nozzle through the hollow part of the rack beam, it will be blown to the nozzle exit without contacting the furnace wall, and it will be preheated by the heated beam and then injected from the nozzle. , there is no overcooling of the furnace wall. Furthermore, since the rack beam is cooled by heat exchange with the oxygen-containing gas, it is possible to prevent bending due to heat, and it is possible to reduce extrusion resistance due to bending.

Embodiments Example 1 FIG. 1 shows an example of a furnace wall carbon removal apparatus for carrying out the method of the present invention.
The extruder (3) discharges red-hot coke (4) from 2) to the fire extinguishing vehicle (6) via the coke guide vehicle (5).

The oxygen-containing low-pressure gas for burning off the carbon is supplied to the extruder (3).
from the rear end through the hollow part of the rack beam (7). Nozzles (8) and (9) communicating with the hollow part are installed at the tip of the rack beam (7).
) is injected into the carbonization chamber (2) through nozzles (8) and (9).

The gas pumping device (10) can also be installed independently of the rack beam (7).In that case, the rack beam (7)
) A connecting pipe is required to supply oxygen-containing gas to the hollow part of the pipe.

The gas pumping device (10) is connected to a power source by a winding drum (11). In addition, the nozzle (8) is a nozzle installed in the rack beam (7), and the injection direction of the oxygen-containing low-pressure gas is either on the extruder (3) side or on the body guide wheel (5).
) side is fine. Moreover, the injection angle can be changed each time according to the carbon adhesion position. Further, the nozzle (9) is attached to an auxiliary duct (12) installed at the top or bottom of the rack beam (7), and can also spray in both directions like the nozzle (8).

The injection amount of oxygen-containing low-pressure gas is controlled by connecting the load detector (13) and moving distance detector (14) of the rack beam (7) of the extruder (3) to the control device (15). , load detector (13) and moving distance detector (14)
The change over time of the load applied to the rack beam (7) and the moving distance of the rack beam from the start of extrusion are input into the control device (15), and based on the elapsed time until the peak value of the load applied to the rack beam. The distance traveled by the rack beam is determined, and the presence or absence of carbon adhesion and the adhesion position are determined from the relationship between this distance and the position of the tip of the shrunken part of the coke (a typical example of the presence or absence of carbon adhesion is shown in Figure 2). ).

If there is carbon adhesion, the carbon adhesion is determined based on the preset relationship between the peak value of the load applied to the rack beam (7) and the injection amount of oxygen-containing low-pressure gas (for example, as shown in Fig. 3). Determine the injection amount of oxygen-containing low pressure gas at the location. The injection amount of oxygen-containing low-pressure gas at other positions is determined to be the lowest value.

When the rack beam (7) is retreating, the control device (15) continuously controls the rotation speed of the gas pumping device (10) and injects the determined oxygen-containing low pressure gas.In other words, the nozzle (809) When the movement distance detector (14) detects that the attachment position has been reached, the rotation speed of the gas pumping device (10) is increased and a predetermined amount of oxygen-containing low pressure gas is injected.

The injection of oxygen-containing low-pressure gas is basically performed when the rack beam (7) moves backward, but the carbon adhesion position is detected from the start of coke extrusion to when the coke in the oven finishes shrinking and starts moving. Since this has been completed, it can also be performed when the rack beam (7) moves forward.

Furthermore, when the oxygen-containing low-pressure gas pumping device (10) is installed independently of the rack beam (7), the pumping device (10) is installed on the extruder (3) or parallel to the coke oven group. A fixed piping for supplying oxygen-containing low-pressure gas can be provided in the coke-extruding rack, and the low-pressure oxygen-containing gas can be supplied by connecting to the rack beam (7) via a connecting piping during coke extrusion.

Example 2 Furnace height 7125mm, furnace width 450mm, furnace length 16500m
In the coke oven of No. m, the apparatus of Example 1 was used, air was used as the oxygen-containing gas for burning off the carbon, and the second
Based on the moving distance of the rack beam during coke extrusion and changes in load according to the diagram, the carbon adhesion position is determined by the machine from the relationship between the moving distance of the rack beam at the peak load (30T) position and the tip distance of the shrunken coke. 13 from the side
360mm and 3140mm from the coke side, and based on the relationship between the peak value of the load on the rack beam and the air injection amount shown in Figure 3, the air injection amount at the carbon deposition position was determined to be 6ONm''/min. .Also,
Minimum injection amount (11Nm'/min) at other positions
It was decided to inject.

When the nozzle installed on the rack beam reaches a position 3140mm from the coke side, air is pumped at 6ONm.
”/min, and 11Nm'/m at other positions.
In the case of the method of the present invention, the presence or absence of carbon adhesion, the adhesion position, and the amount of air injection are determined based on the movement distance of the rack beam and changes in the load over time from the second time onward. Air was injected every time the extrusion was carried out 8 times in a row for each case where the injection amount was constant at 60 m''/m1n.

In the case of the method of the present invention, carbon adhesion disappeared from the 5th extrusion, so the air injection amount was 11 Nm"7
m1n became constant.

Then, the peak value of the load applied to the rack beam during extrusion was measured. The results are shown in FIG.

As shown in Figure 4, in the case of this invention method, which continuously controls the amount of injected air according to the amount of carbon deposited at the carbon deposition position, the peak value of the load applied to the rack beam decreases quickly and the numerical value is low. It was confirmed that it is stable. However, when the air injection amount is constant, the peak value of the load applied to the rack beam decreases slowly. On the contrary, this is because the air injection amount was as high as 6ONm''/min, so carbon was completely removed and the roughening of the brick surface slowed down the drop in the peak value of the load applied to the rack beam.

This shows that carbon was effectively removed by controlling the air injection amount in accordance with the amount of carbon deposited.

As described in detail, according to the method of the present invention, carbon adhering to the wall of the coke oven carbonization chamber can be removed uniformly and quickly, without overcooling the wall of the coke oven chamber, and without overcooling the wall of the coke oven. can be removed without impairing the sealing properties of the parts. In addition, since the extruder and rack beam are effectively utilized, the equipment cost is significantly reduced, and the carbon removal method and apparatus are excellent in that they can prevent the rack beam from bending due to heat.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram showing an example of a carbon removal device that implements the method of the present invention, and Fig. 2 is an example of changes in the moving distance and load of the rack beam from the start of extrusion, with and without carbon adhesion. Figure 3 is a diagram showing the relationship between the peak load applied to the rack beam and the amount of air injection, and Figure 4 is a diagram showing the relationship between the amount of air injection and the number of extrusions depending on the amount of attached carbon. It hangs on the rack beam. FIG. 3 is a diagram showing the relationship with peak load. DESCRIPTION OF SYMBOLS 1... Coke oven, 3... Extruder, 5... Coke guide car, 7... Rack beam, 10... Gas pressure feeding device, 12... Auxiliary duct, 14... Movement distance detection 2... Carbonization chamber, 4... Red-hot coke, 6... Fire extinguisher, 8.9... Nozzle, 11... Winding drum, 13... Load detector, 15... Control Equipment, Figure 1

Claims (1)

[Claims] 1. Detect the presence or absence of carbon adhesion and the adhesion position from the change over time in the load applied to the rack beam of the coke oven extruder, and depending on the carbon adhesion position and the peak load of the rack beam, detect oxygen content from the injection nozzle installed on the rack beam. A method for controlling coke oven wall carbon, characterized by continuously controlling the amount of gas injected.