JPH10251648A - Method for repairing wall brick of coke oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for repairing wall bricks of a chamber oven whereby peeling and cracks of a sprayed repair material at joint cuts can be avoided. SOLUTION: The life of a glass coating layer formed on joint cracks can be extended by forming the layer by spraying a glaze (e.g. a glass coating agent) from the side of a combustion chamber onto a wall bricks 3 by atomozing the glaze into a combustion gas 3 through a lance inserted into a peeping hole 1 of the chamber 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of blowing a glaze onto a joint of a furnace wall brick between a combustion chamber and a carbonization chamber from a combustion chamber side in a coke oven furnace to close the joint.

[0002]

2. Description of the Related Art In a coke oven furnace, a structure in which coal is charged into the interior of the furnace and carbonized and carbonized therein is sandwiched by a combustion chamber in which a high-temperature combustion gas is circulated through a furnace wall brick. Since the combustion chambers and the carbonization chambers are alternately arranged in parallel, one combustion chamber can supply heat to the carbonization chambers on both sides. The coal in the carbonization chamber is transferred to the sensible heat of the high-temperature gas flowing through the combustion chambers on both sides through the furnace wall brick and carbonized.

[0003] On the furnace wall brick surface in the carbonization chamber, not only mechanical force is applied during the charging of coal or in the process of extruding coke after carbonization, but also thermal stress due to temperature change is generated, so that it takes a long time. Furnace wall bricks wear out during the operation period. Particularly at the joints of the furnace wall bricks, so-called joint breaks occur due to the influence of the movement of the individual bricks, and the gaps between the joints may be widened to such an extent that gas flows between the combustion chamber and the carbonization chamber.

[0004] When such a state is reached, there arises a problem that fine powder of coal in the carbonization chamber enters the combustion chamber and deposits.
If this progresses, there is a possibility that a serious situation may occur such that the gas holes and air holes for combustion are blocked and the combustion becomes impossible. Therefore, it is necessary to repair the joint of the furnace wall brick. Generally, a dusting method of a coking chamber is used to close a joint of a furnace wall brick of a coke oven. In this method, while maintaining the combustion chamber at a lower pressure than the carbonization chamber, mortar powder containing silica and alumina as the main component is sprayed from the furnace top inlet of the coke oven, and the fine gaps between the joints of the furnace wall brick are separated. Is a method in which mortar powder entrained in an airflow flowing from a carbonization chamber to a combustion chamber enters a joint break of a furnace wall brick to block joints.

Further, in recent years, a glass coating method in which a glass coating agent is sprayed from a carbonization chamber onto the entire surface of a furnace wall by a spray nozzle as disclosed in Japanese Patent Application Laid-Open No. 8-119775 has also been used. In this method, a water glass-based chemical is sprayed from a carbonization chamber onto the entire furnace wall with a spray nozzle to form a glass coating layer having a thickness of several tens of μm on the furnace wall surface and at the same time fill in joints of the furnace wall brick.

[0006]

In the former dusting method, when a coke oven operation is started for spraying repair from a carbonization chamber, furnace wall bricks are charged by operations such as charging coal and extruding coke. Various mechanical stresses act on the surface, and the blown mortar powder peels off, and there is a problem that gas leaks from the joint breaks in a short time.

[0007] In the latter method of glass coating, intrusion of cold air into the furnace due to detachment of the door during operation, about 60%.
There was a problem that cracks due to thermal stress were generated in the formed glass coating layer due to a thermal history such as a rapid temperature drop of the furnace wall temperature of about 1100 ° C. when charging coal at up to 70 ° C.

[0008]

The combustion chamber has the following features as compared with the carbonization chamber. That is, only gas flows inside, and the mechanical stress due to charging of coal and extrusion of coke does not act on the furnace wall surface as in the carbonization chamber.
Since there is no sudden change in temperature such as intrusion of cold air by opening the door or rapid cooling by charging coal, strong thermal stress does not occur on the furnace wall surface.

The present inventor paid attention to this point, and sprayed a glaze, particularly a glass coating agent, from the combustion chamber where the mechanical stress and temperature change were small to the joints of the furnace wall brick, thereby greatly extending the life of the glass coating layer. The present invention has been extended. That is, the present invention provides a combustion chamber of a coke oven furnace,
This is a method for repairing joints in the furnace wall brick between the carbonization chambers, in which glaze is sprayed into the combustion gas from a spraying lance inserted into the peeping hole of the combustion chamber and sprayed on the furnace wall brick from the combustion chamber side. A method of repairing coke oven wall bricks, wherein a glass coating layer is formed to close joints of the oven wall bricks.

[0010]

FIG. 1 is a sectional view showing an example of a spraying device suitable for an embodiment of the present invention. The embodiment will be described with reference to FIG. When the combustion gas 3 passes through the heat storage chamber 5 and passes through the upper horizontal flue 12, a spraying lance 9 is inserted from the peeping hole 1 and the glaze 10 is sprayed in a mist.
The diameter of the nozzle 8 of the lance is about 0.3 mm in order to spray in a mist. The mist glaze descends or rides on the combustion gas 3 and moves to the opposite side (in this case, from the guide wheel 7 side to the extruder 6 side) to form the furnace wall brick 13 and the flow path of the combustion gas. It adheres to the multi-stage burner brick 14, forms a glass coating layer, and closes joints.

FIG. 1 shows an example in which the combustion gas flows from the guide wheel 7 to the extruder 6. However, in the operation of the coke oven, the guide gas 7 and the extruder 6 side are normally used. In order to prevent a temperature difference from occurring in the fuel cell, a method of periodically changing the flow direction of the combustion gas is adopted. Therefore, it is desirable to spray the glaze of the present invention both during the period when the combustion gas flows from the guide wheel 7 to the extruder 6 and during the period when the combustion gas flows in the opposite direction. The time required for spraying varies depending on the pressurization state of the chemical tank 15, the viscosity of the glaze, and the like. Use a material that can withstand 1100 ° C or higher for the nozzle and spray lance, or cover the outer surface with a refractory, or
A structure that can withstand the temperature inside the combustion chamber, such as a water-cooled structure.

[0012]

EXAMPLE The present invention was carried out in a coke oven having a production volume of 2000 t / d and a number of gates of 100. Furnace top peeping hole 36 holes /
Seven spray lances are inserted into the gate at regular intervals every four holes, and spraying is performed for 2 minutes per chamber during the combustion time.
I went there. Spraying was performed once each at the time of combustion on the guide wheel side and the extruder side.

The spraying agent uses water glass and has a viscosity of 80 cP
(20 ° C). The spray amount was 20 l per kiln. After spraying all kilns in 5 days, the dust concentration at the entrance of the flue dust collector was measured.
It decreased to 1/5 before spraying and it took one month to return to the level before spraying. In the conventional method (glass coating method by spraying from the carbonization chamber side), it returned to the level before spraying in one week.

[0014]

According to the present invention, the life of the glass coating layer at the joint of the furnace wall brick is reduced by spraying a glaze, particularly a glass coating agent, from the combustion chamber where the temperature change and stress received from the operation are small. Could be greatly extended. Therefore, chimney graphite can be prevented, and the life of the furnace wall brick can be prolonged in a long term. In addition, when the joints of the furnace wall bricks are closed, the amount of leaked C gas is reduced, so that there is an effect that the generated C gas increases.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of the present invention.

FIG. 2 is an explanatory view of a spraying machine used in the present invention.

FIG. 3 is an explanatory diagram of a nozzle used in the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Peeping hole 2 Glaze spraying machine 3 Combustion gas 4 Combustion chamber 5 Thermal storage chamber 6 Extruder 7 Guide car 8 Nozzle 9 Spraying lance 10 Glaze 11 Pressurizing N ₂ 12 Upper horizontal flue 13 Furnace wall brick ( 14) Multi-stage burner brick 15 Chemical tank

Claims (1)

[Claims] 1. A method for repairing a joint break of a furnace wall brick between a combustion chamber and a carbonization chamber of a room-type coke oven, wherein glaze is supplied from a spray lance inserted into a peeping hole of the combustion chamber into a combustion gas. A method of repairing coke oven wall bricks, comprising spraying water onto the oven wall bricks from the combustion chamber side to form a glass coating layer and closing joints of the oven wall bricks.