JPS5849593B2 - Method for cleaning sulfur-adhered blockages in coke oven gas desulfurization equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cleaning sulfur-adhered blockages in coke oven gas desulfurization equipment.

Conventionally, the redox reaction type wet desulfurization method for removing hydrogen sulfide from coke oven gas involves the process of bringing gas into contact with an absorption liquid containing a catalyst to absorb hydrogen sulfide into the absorption liquid, and the process of absorbing the hydrogen sulfide. The process involves bringing the absorption liquid into contact with a gas containing oxygen, oxidizing hydrogen sulfide to elemental sulfur, and at the same time regenerating the alkali and catalyst in the absorption liquid.

However, in the process where the absorbing liquid and gas come into contact, the gas contains trace amounts of oil and unsaturated hydrocarbons, and these substances form a viscous mixture or gum with elemental sulfur, which can cause damage to the packed bed of the desulfurization tower and heat. In some cases, it adheres strongly to exchangers and other parts, causing blockage, and eventually making desulfurization impossible.

To counter this, it is necessary to temporarily stop the operation of the equipment, dismantle and clean the blocked parts such as the packed bed or heat exchanger, and then restart the operation. There were many problems such as environmental problems and costs.

In order to solve these problems, the present invention establishes a method of cleaning sulfur deposits from coke oven gas desulfurization equipment using a mixture of ammonium water generated from coke ovens and phenol or tar acid, which is extremely economical. In short, these problems have been solved.

That is, conventionally, this sulfur-adhered blockage has been dismantled, the packed bed at the blockage location has been taken out, and after being washed with high-pressure jet water or hot water, it is put back into the original equipment and reassembled.
This required disassembly, removal, cleaning, reassembly, and the labor costs of multiple dogs.

The present invention takes advantage of the fact that when this sulfur deposit is washed with a mixture of ammonium water and phenol or ammonium water and cool acid, the caking substance that firmly adheres the sulfur dissolves and is easily peeled off. By adding 0.1 to 20% phenol to ammonium water instead of the absorption liquid in coke oven gas desulfurization equipment without dismantling the equipment.
% of tar acid in a mixed solution or ammonium water with 0.1 to 20% of tar acid
These problems can be solved extremely economically by simply circulating the added liquid mixture.

The drawing is a sectional view of a desulfurization tower showing an embodiment of the present invention, and 1
2 is a desulfurization tower in which the coke oven gas and the absorption liquid are in countercurrent contact, and 2 is a packed bed containing plastic packing, which is clogged with adhesion of sulfur.

No. 9 is also a packed bed with a plastic filler in it, but it is not blocked.

3 is a tank, which contains a solution of ammonium water according to the present invention with 10% tar acid added thereto, and a heating coil 8 is used to heat the solution from 60 to 60%.
The liquid is heated to 70° C. with steam and washed down from the top of the column via a circulation line 5 by a pump 4, and returned to the tank 3 for recirculation.

6 is a tower bottom blow line, and 8 is a heating coil.

The sulfur blockages adhering to the packings are removed by the ammonium water and phenol mixture and flow down to the bottom of the tower together with the mixture, and the blockages are completely removed from each stage by circulating cleaning for one day and night. The washed and peeled sulfur slag passed through each stage of the unblocked packed bed 9 and accumulated at the bottom of the tank 3 from the bottom of the tower.

This sulfur slag at the bottom of the tank is extracted through a blow line 7 and treated by incineration in an incinerator or charging into a coke oven.

The cleaning method using a mixed solution of ammonium water and tar acid also has the effect of preventing detached blocked sulfur slag from re-adhering to the packed bed.

That is, if cleaning is performed using only hot water as in the conventional cleaning method, clogging sludge separated from the upper filling layer 2 will adhere to the lower filling layer 9, making cleaning even more difficult.

Exactly the same effect can be obtained by using a mixture of ammonium water and phenol instead of the mixture of ammonium water and tar acid according to the present invention.

Also, the amount of phenol or tar acid added to ammonium water is 0.1
-20% Preferably 3 to 10%. If the concentration is lower than 0.1%, the cleaning effect will be low, and if it is higher than 20%, it will be a heavy economic burden and the amount of clogging sulfur slag mixture will increase, so this is adopted. Can not.

In addition, if the cleaning temperature is low, the cleaning effect will decrease, and if it is high, heating costs will increase, and there are restrictions on equipment, so the cleaning temperature should be 50 to 80℃.
is desirable.

As described above, according to the method of the present invention, sulfur-adhered blockages in coke oven gas desulfurization equipment can be completely cleaned with a mixture of cheap ammonium water, self-produced tar acid, and phenol without dismantling the equipment. This allows for economical benefits of having multiple dogs, such as shortening cleaning time and reducing disassembly and cleaning costs.

[Brief explanation of drawings]

The drawing is a sectional view of a desulfurization tower showing an embodiment of the present invention. 1: Desulfurization tower, 2: Packed bed, 3: Tank, 4: Pump, 5
: circulation line, 6: bottom blow line, 7: blow line, 8: heating coil, 9: packed bed.

Claims (1)

[Claims] 1 In equipment that removes hydrogen sulfide from coke oven gas by contacting coke oven gas with an alkali-containing absorption liquid,
Remove sulfur-adhered blockages from the equipment using a mixture of ammonium water and phenol.
A method for cleaning sulfur-adhered blockages in coke oven gas desulfurization equipment, the method comprising cleaning with either ammonium water or a tar acid mixture.