JPS61197685A - Removal of carbon deposits in carbonization chamber and riser of coke oven - Google Patents

Abstract

PURPOSE:To remove deposited carbon in a short time and utilize recovered gas effectively, by blowing a gas which contains a large amount of CO2 into a carbonizing chamber of a coke oven to gasify carbon deposited in the carbonizing chamber and the riser. CONSTITUTION:In dry distillation of coal, a gas which contains a large amount of CO2 (e.g. coke oven waste gas or blast furnace gas) is blown into a carboniz ing chamber 1 of a coke oven through blowing burners 2a, 2b and 2c so that carbon 5 deposited in the carbonizing chamber 1 and the upstanding part of a riser 6 may react with CO2 for gasification according to the reaction formula. The gasified carbon is suctioned by ejection with an ammonia water spray 9 and recovered into a dry main 8 via the riser 6. The method makes it possible to remove carbon deposits in a short time and improve the productivity of coke.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for removing carbon adhering to a coke oven carbonization chamber and riser pipe.

[Conventional technology]

Carbon with a balance of 098 to 99% Aih adheres to the inner walls of the coking chamber and riser pipe for drawing out carbonized gas in a coke oven for producing coke.

If these carbons are left unattended, they will interfere with carburization and extrusion, so they must be removed.

Therefore, in removing the above-mentioned carbon, since the carbon is fixed in a high-temperature atmosphere, removal has been carried out exclusively by combustion of the carbon. The method for removing attached carbon by combustion involves opening the riser pipe cover 7 when the kiln is empty, then opening the charge port cover, sucking air by a draft effect, burning the carbon, and releasing it into the atmosphere. However, conventionally, depending on the condition of the deposited carbon, such as its thickness and size, it may take a long time to remove it, or it may not be possible to burn it all at once. In such cases, coke oven operations are generally based on charging coal immediately after extruding coke, but in order to burn off the adhering carbon, it is necessary to charge coal immediately after extruding coke. The removal time is carried out in so-called 9 kilns, and the removal time is as long as 2 hours for the shortest one, and about 20 hours for the longest one.

Therefore, it not only affects coke production activities, but also accelerates the deterioration of the coke oven itself, which is mostly made of bricks.

There has been a long-awaited development of a method to remove this thickened carbon without damaging the coke oven or affecting production activities, and to effectively utilize the carbon stuck to the coke oven.

[Problem that the invention seeks to solve]

The present invention aims to provide a method for removing adhering carbon that can remove adhering carbon in traps such as coke oven carbonization chambers and riser pipes in a short time, gasify and recover the adhering carbon, and effectively utilize the recovered gas. purpose.

[Means for solving problems]

The present inventor has focused on the fact that the deposited carbon itself is carbon, and has arrived at the present invention in order to solve the above-mentioned problems and demands.

That is, the present invention injects a gas containing a large amount of CO2 into the carbonization chamber during coal carbonization, at the final stage of carbonization, and after carbonization,
The deposited carbon is reacted with CO and gas to be gasified, and the reaction gas is collected together with conventional coke oven gas into a dry men (air collecting pipe) and effectively utilized through a predetermined gas treatment process.

[For production]

In the method of the present invention, a gas containing a large amount of "Cot t" is blown into the carbonization chamber, and the reaction of Co!+ C= 2CO (1) occurs between this gas and the deposited carbon. The reaction of formula (1) is an endothermic reaction and there is a concern that it may cool the furnace.

Therefore, it is necessary to supply some heat to advance the reaction in equation (1), but the inside of the coke oven is filled with flammable gas (CO gas).
Since carbon is present and the combustion temperature has been sufficiently reached, heat can be supplied by simply supplying a small amount of OS.

However, since there is a concern that supplying only OS may cause local combustion in the supply section and induce deterioration of coke oven bricks and hardware, it is necessary to control the combustion rate while controlling the combustion rate.
The snow ratio is appropriately controlled within the range of 0.220% to 100% to 0.20% to 10%, the carbon in the carbonization chamber is gasified, and the gas is recovered.

〔Example〕

Next, the present invention will be applied to the carbonization chamber and riser pipe of a Karlstil type coke oven, and the subsequent aspects will be described.

FIGS. 1 and 2 are explanatory diagrams of the method of the present invention when the carbonization chamber and riser pipe of the above-mentioned furnace are filled with coke and when the oven is empty, respectively.

In Figures 1 and 2, 1 is a coke oven carbonization chamber with a width of 450 mm, a height of 7550 mm (effective 7200 mm), and a length of 17 mm.
000 Tsuku (effective 16200■) Effective internal volume 52.5rr
! The specifications are as follows. In the case of an empty oven after extruding coke, a gas injection burner 2 is installed through the coal charging port (400 mm) 3 and the coke oven cover 4 as shown in Fig. 2, and a gas injection burner containing a large amount of Co is installed. For example, coke oven waste gas, blast furnace gas (B gas), and other gases containing a large amount of CO are blown into the carbonization chamber 1 from the gas injection burners 2m, 2b, and 2c, and the reaction of equation (1) is performed. , Carbon (C: 98
~99 S Ash 1~2%) 5 t into scum L, or on the other hand, in the case of coke filling, it is gasified as shown in FIG. The gas is collected via Drymen 8 together with normal carbonization gas.

The amount of adhered carbon 5 produced under the operating conditions of 1a3t coal charge/kiln cycle and 130cm operating rate is 1 to 10 times 9.
/ chamber carbonization cycle, when charging coke, as shown in Fig. 1, combustion waste gas containing a large amount of Co is emitted from the blowing burner 2a as shown in Fig. 1. For example, gas composition (volume %) Co: 30% O! :
5%Nt: Blow to 65% for 2 hours to make CO6
The recovered gas with a concentration of 23% is collected together with the normal carbonization gas in the dry men 8, and when the kiln is empty, the combustion waste gas is transferred to the blow burners 2b and 2c as shown in Fig. 2. O is injected within about 1 to 1.5 hours, collected, and effectively used by separate piping.As a result of performing the above gas blowing work every 2 to 10 carbonization cycles, on average every 5 carbonization cycles, the attached carbon is removed. It is expected that the operating rate will improve by 1-2%.

In addition, when blowing gas containing a large amount of CO, the temperature inside the carbonization chamber is 900 to 850 degrees Celsius when coke is filled. Blow in combustion waste gas with a high content of CO2 and O.

The component ratio was adjusted.

〔Effect of the invention〕

The method for removing adhering carbon of the present invention can remove adhering carbon in a short time, thereby improving coke productivity compared to the conventional method, and since it is gasified, the recovered gas can be effectively recovered and used. It is effective.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams of the method of the present invention during coke filling and an empty oven, respectively. In the figure, 1: carbonization chamber, 2: blowing burner, 3: coal charging port, 4: furnace lid, 5: deposited carbon, 6: riser pipe, 7:
Top lid, 8 Ni Dry Men, 9: Anhydrous spray. In each figure, the same reference numerals indicate the same or corresponding parts.O Agent: Patent Attorney Sanro Kimura

Claims (1)

[Claims] CO_2 to remove adhering carbon in the coke oven
A method for removing deposited carbon from a coke oven carbonization chamber and a riser pipe, comprising blowing gas containing a large amount of carbon into the carbonization chamber to gasify the deposited carbon.