JPH03212487A - Method for operating coke oven - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a coke that can effectively recover carbon adhering to the inner wall of the upper space of a coking chamber as Co gas during carbonization of coal in a coke oven. It concerns how to operate a furnace.

[Conventional technology]

When operating a coke oven, as the operating rate increases, the oven temperature increases. Therefore, the atmospheric temperature in the upper space of the carbonization chamber is also 1. For example, when the coke oven operating rate is 120%, it is about 700 to 900"C, but when the operating rate is 140%, it is about 800 to 1", OOOT: rises to .

As described above, when the atmospheric temperature in the upper space of the carbonization chamber rises, carbon generated by the thermal decomposition of CIIH in the coke oven gas generated during the carbonization process of coal and the thermal decomposition of tar will be deposited on the inner wall of the upper space. The amount of adhesion increases rapidly.

As a result, when the coke is taken out of the kiln, the ram of the extruder that is inserted into the carbonization chamber and pushes out the coke gets caught on the carbon attached to the inner wall of the upper space of the carbonization chamber, scraping off the inner wall of the carbonization chamber together with the carbon. , the inner wall bricks are damaged, and furthermore, the coal charging port installed on the top wall of the carbonization chamber becomes narrow due to the adhering carbon, resulting in problems such as a decrease in the amount of coal charged into the carbonization chamber. .

In order to solve the above-mentioned problems, conventionally, air is blown from the coal charging port on the top wall of the carbonization chamber to burn and remove the attached carbon.

[Problem to be solved by the invention]

The conventional carbon removal means described above has the following problems.

(1) Because the attached carbon is simply burned,
Not only is there no effective recovery of the carbon, but the heat of combustion of the carbon causes burnout to the furnace wall bricks in the carbonization chamber.

(2) As a result of the blowing of air, the coke gas remaining in the carbonization chamber is combusted, resulting in a decrease in the yield of coke gas.

(3) In order to remove carbon by blowing air from the coal charging port, charging of coal to the coking chamber must be stopped and the chamber must be left empty, resulting in a decrease in coke utilization rate. .

Therefore, an object of the present invention is to solve the above-mentioned problem associated with the adhesion of carbon to the inner wall of the upper space of the coking chamber that occurs during carbonization of coal in a coke oven, and to effectively recover the carbon as an energy source. An object of the present invention is to provide a method of operating a coke oven that can improve the yield of coke gas.

[Means to solve the problem]

The present inventors have conducted extensive research in order to solve the above-mentioned problem associated with the adhesion of carbon to the inner wall of the upper space of the carbonization chamber, which occurs during carbonization of coal in a coke oven. As a result, a gas containing at least one of CO2 and H, O is blown into the upper space of the carbonization chamber to cause the gas to react with carbon attached to the inner wall of the upper space, It has been found that by decomposing the carbon, the CO-containing gas generated by the decomposition can be effectively recovered, and the coke gas remaining in the carbonization chamber can also be recovered without being combusted.

This invention was made based on the above findings, and
During carbonization of coal in a coke oven, a gas containing CO8 and at least one of H and O is blown into the upper space of the coking chamber to remove the gas and carbon attached to the inner wall of the upper space. The method is characterized in that the carbon is decomposed by reacting the carbon, and the gas generated by the decomposition of the carbon is recovered.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing one embodiment of the method of the present invention. As shown in FIG. 1, during carbonization of coal 1 charged into a carbonization chamber 2, combustion exhaust gas combusted in a combustion chamber passes through a heat storage chamber 3, a flue 4, and is released into the atmosphere.

This combustion exhaust gas has a composition and temperature as shown in Table 1 below.

Therefore, a part of this combustion exhaust gas is drawn out from the middle of the flue 4 through the conduit 5, and into the upper space 2a of the coking chamber 2. A gas inlet 8a is provided at the top 116 on the coke side side or at the side wall 7. Or blow through 8b.

In this way, CO2 and H2O in the combustion exhaust gas blown into the upper space 2a of the carbonization chamber 2 react with carbon attached to the inner wall of the upper space 2a as described below, decomposing the carbon. do.

C+CO2→2C0 C+H,0-ecO+H2 The CO-containing gas thus generated by the decomposition of carbon is recovered through the riser 9 together with the coke oven gas.

The gas blown into the upper space 2a of the carbonization chamber 2 is not limited to the above-mentioned combustion exhaust gas, but is a relatively low-temperature gas containing at least one of CO2 and H and O, such as from Blast Furnace Gas Co., Ltd. Any gas may be used, and the gas may be blown continuously during the entire carbonization period, intermittently, or only during the latter half of the carbonization period.

Gas is blown into the upper space 2a through a gas inlet 8a provided on the top wall 6 on the side opposite to the coke gas discharge hole, for example on the coke side, or a gas inlet 8 provided on the side wall 7.
It is preferable to carry out through b.

Next, this invention will be further explained by examples.

〔Example〕

In a coke oven with internal volume = 39N/kiln, coal charging amount: 28T/kiln, and number of carbonization chambers: 50 to 55, 200kg/kiln is placed on the inner wall of the upper space of the carbonization chamber during carbonization of coal.
60 days' worth of carbon is deposited.

Therefore, by the method of this invention, during the latter half of the carbonization for about 5 hours, the combustion exhaust gas was converted into 3.5Nrrl'/)I,
When the gas was blown into the head space at an amount of about 20 ONrn'/H per furnace block, the attached carbon was completely decomposed and removed, and this gas could be effectively recovered. The amount of combustion exhaust gas required to decompose and gasify the attached carbon was calculated as follows.

a. Amount of carbon deposited per kiln per hour: 200 kg ÷ (
24H x 60 days) = 0.14 kgb, Theoretically necessary amount of combustion exhaust gas for carbon decomposition: 6.9 Nrrl'C per 1 kg of carbon, assuming decomposition efficiency as 100%, Actual required amount of combustion exhaust gas for carbon decomposition: Decomposition efficiency Assuming 30%, 0.14kg/H-kiln x (6,9N+y?/kg÷0.
3)'': 3.2Nrri'/H-kiln → 3.5Nrn'/
Furthermore, as in the conventional method for removing adhering carbon, the coke gas remaining in the carbonization chamber burns and dissipates as air is blown from the coal charging port in an empty cavity. Since there is no such thing, it is 5,00ONrn commensurate with the amount of fuel and damage.
'/We were able to recover more coke gas from the H-3 furnace group.

In this way, the yield of coke gas was improved by about 0.8% compared to the conventional method by recovering gas by gasifying carbon and recovering coke gas that was conventionally combusted.

〔Effect of the invention〕

As described above, according to the present invention, carbon adhering to the inner wall of the upper space of the coking chamber can be gasified and removed during carbonization of coal in a coke oven, and this gas can be effectively recovered. .

Furthermore, as in the conventional carbon removal method, the coke gas remaining in the carbonization chamber does not burn and dissipate due to air being blown from the coal charging port in an empty state. , These bring about an industrially useful effect that can improve the yield of coke gas.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the method of the present invention. In the drawing, 1... Coal, 2... Carbonization chamber, 2a...
Carbonization chamber upper space, 3... heat storage chamber, 4... flue, 5... conduit, 6... top wall. 7...Side wall, 8a, 8b...Gas inlet, 9...Rising pipe.

Claims (1)

[Claims] 1. During carbonization of coal in a coke oven, a gas containing at least one of CO_2 and H_2O is blown into the upper space of the coking chamber, and the gas and the inner wall of the upper space are A method for operating a coke oven, which comprises decomposing the carbon by reacting with attached carbon, and recovering gas generated by the decomposition of the carbon. 2. The method according to claim 1, wherein the gas is flue gas from a coke oven. 3. The method according to claim 1, wherein the gas is blown from a top wall or a side wall of the carbonization chamber.