JPH01247485A - Prevention of coke oven from emitting black smoke - Google Patents

Abstract

PURPOSE:To prevent a coke oven from emitting a black smoke by a simple process, by blowing steam into a coking chamber of a coke oven provided with coking chambers and combustion chambers of which two successive chambers are contiguous to each other through a wall having through-cracks simultaneously with charging the coking chamber with coal. CONSTITUTION:In a coke oven provided with coking chambers 2 and combustion chamber 3 of which two successive chambers are contiguous to each other through a wall having through-cracks 4, steam is blown into the selected coking chamber by operating a valve 7 fitted on a steam branch 8 during charging the coking chamber 2 with coal. The combined steam comprising one blown from the branch 8 and one generated from the coal just after the charging flows into the combustion chamber 3 and performs a water gas reaction with incompletely burned gas generated from coal leaked into the combustion chamber 3 and therefore the emission of a black smoke is prevented. After the coal charge is completed, the supply of steam is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for preventing the generation of black smoke in a coke oven.

A plurality of carbonization chambers and combustion chambers adjacent to each other with the furnace wall f
When coke ovens equipped with internal combustion engines become obsolete, cracks may develop in the oven walls. When coal is charged into the carbonization chamber in such a case, the coal may leak into the combustion chamber through the through cracks. This coal is incompletely combusted in the combustion chamber, and the black smoke generated is discharged from the chimney for combustion waste gas to the outside, causing air pollution.

This kind of black smoke is likely to occur after ``voiding'' (a method of burning off carbon adhering to the furnace wall) is performed. This is because the carbon that was stuck in the through crack is burned out and both chambers are penetrated.

(Prior Art) Conventionally, as a measure to prevent the generation of black smoke, attention has been paid to blocking penetration cracks in the furnace wall to prevent coal from leaking into the combustion chamber.

One method to solve this problem is a dry rule, in which a powdered refractory of thermoset 11 is pressurized with compressed air into the carbonization chamber immediately after the cavity is formed to fill the crack. However, because
Experience has shown that this method is only effective when charging coal for the first or second time after the pit has been emptied.

Another method is to repair cracks in the furnace wall by thermal spraying with refractories, but due to the structure of coke ovens, complete and durable repair is difficult.

(Problems to be Solved by the Invention) As described above, since the conventional methods for preventing the generation of black smoke have been insufficient, there has been a demand for a more effective method for preventing the generation of black smoke.

(Means for solving the problem) As a result of investigating the relationship between various operating conditions of coke ovens and the generation of black smoke, it was found that the generation of black smoke tends to decrease when the moisture content of the charged coal is high. Now I know that.

Therefore, in the present invention, we focused on increasing the amount of water vapor in the coke oven, instead of closing the through cracks as in the conventional method.

According to the present invention, steam is blown into the coking chamber when charging coal into the coking chamber of a coke oven equipped with a coking chamber and a combustion chamber that are adjacent to each other via a furnace wall having penetrating cracks. A method for preventing black smoke generation in a coke oven is provided.

The water vapor may be blown into the combustion chamber.

(Function) According to the method for preventing black smoke generation of the present invention, when one piece of coal is charged into the carbonization chamber, steam is also blown at the same time.

Then, together with the steam generated from the coal immediately after charging, the total amount of steam increases and flows into the combustion chamber through the through cracks in the furnace wall. The generation of black smoke is suppressed by this inflowing steam reacting with incompletely combusted gas generated by coal leaked into the combustion chamber from the through cracks, thereby suppressing the generation of black smoke.

A similar water gas reaction occurs when water vapor is blown into the combustion chamber.

(Example) As shown in FIG. 2, a coke oven includes a plurality of carbonization chambers 2 and combustion chambers 3 that are adjacent to each other via a furnace g1. If a through crack 4 occurs in a part of the furnace wall l, when charging coal from the coal charging port 5 into the carbonization chamber 2, a part of the coal leaks through the through crack 4 into the combustion chamber 3, where it is burned. Burns incompletely and produces black smoke.

Therefore, as shown in FIG. 1, a steam main pipe 6 that communicates with a steam supply source (not shown) is provided across the top of the coke oven, and from the main pipe 6 via a switching valve 7, each carbonization chamber 2 is Steam branch pipes 8 are guided to the coal charging port 5, and when charging coal into the carbonization chamber 2, steam is blown into the selected carbonization chamber 2 by operating the valve 7 provided in each branch pipe 8. Since supply and stop of steam to each carbonization chamber 2 can be controlled by operating each valve 7, it is only necessary to blow steam into the carbonization chamber 2 adjacent to the furnace wall 1 having the through crack 4.

The increased amount of water vapor, including the amount injected from the support v8 and the amount generated from the coal immediately after charging, flows into the combustion chamber 3 through the through crack 4 in the furnace wall l, and leaks into the combustion chamber 3. Since the water gas reacts with the incomplete combustion gas generated from the coal, the generation of black smoke is suppressed. After the charging of coal 9 is completed, the supply of steam is stopped.

In another embodiment, not shown, a steam branch 8 extending from the steam main pipe 6 is led into the combustion chamber 3, and the steam is injected directly into the combustion chamber 3 adjacent to the furnace wall 1, which causes the through crack 4. The other points are the same as the embodiments described above.

(Effects of the Invention) According to the method of the present invention, black smoke generation can be more effectively prevented over a long period of time compared to the conventional dry/ru method.

[Brief explanation of the drawing]

FIG. 1 shows a steam piping installation for carrying out the method according to the invention together with a cross section of the carbonization chamber of a coke oven. FIG. 2 is a longitudinal sectional view of the coke oven. l: 2 furnace walls, carbonization chamber 3, combustion chamber 4: through crack 5, coal charging inlet 6: steam main pipe 7: switching valve 8:
Steam branch pipe 9: 1k fathom of coal --

Claims (2)

[Claims] (1) A coke oven equipped with a coking chamber and a combustion chamber that are adjacent to each other through a furnace wall having penetrating cracks, characterized in that steam is blown into the coking chamber when charging coal into the coking chamber. How to prevent black smoke from occurring. (2) A coke oven equipped with a coking chamber and a combustion chamber that are adjacent to each other through a furnace wall having penetrating cracks, characterized in that steam is blown into the combustion chamber when charging coal into the coking chamber. How to prevent black smoke from occurring.