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Desulfurization method of coke oven gas

A technology for coke oven gas and desulfurization tower, which is applied in the fields of combustible gas purification, liquid scrubbing gas purification, combustible gas purification/reconstruction, etc. The effect of desulfurization rate and production cost reduction

Inactive Publication Date: 2016-01-13
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the process of the coke oven gas flowing downward from the top of the desulfurization tower, the sulfur-containing substances in the coke oven gas are gradually absorbed, and a certain amount of heat of dissolution will be released during the absorption process, and the ammonia contained in it will gradually react with the sulfur-containing substances. The acid-base neutralization reaction releases a certain amount of chemical reaction heat. The above-mentioned heat of dissolution and chemical heat cause the temperature of the desulfurization liquid to rise too fast, thereby reducing the desulfurization rate and increasing the production cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]1) Control the initial temperature of the coke oven gas entering the desulfurization tower to be 25°C, and control the initial temperature of the desulfurization liquid entering the desulfurization tower from the top of the desulfurization tower to be 35°C;

[0036] 2) In the desulfurization tower, when the desulfurization liquid flows out from the upper packing layer and before entering the lower packing layer, the desulfurization liquid between the upper packing layer and the lower packing layer is cooled by a partition wall heat exchanger, and the flow into the partition wall is controlled. The temperature of the cooling water before the partition heat exchanger is 16°C, the flow rate of the cooling water before entering the partition heat exchanger is 1600L / min, and the temperature of the cooled desulfurization liquid is 26°C.

[0037] In this embodiment, the rest of the process steps, process parameters, and processing equipment used are the same as those of the prio...

Embodiment 2

[0040] 1) Control the initial temperature of the coke oven gas entering the desulfurization tower to be 27°C, and control the initial temperature of the desulfurization liquid entering the desulfurization tower from the top of the desulfurization tower to be 33°C;

[0041] 2) In the desulfurization tower, when the desulfurization liquid flows out from the upper packing layer and before entering the lower packing layer, the desulfurization liquid between the upper packing layer and the lower packing layer is cooled by a partition wall heat exchanger, and the flow into the partition wall is controlled. The temperature of the cooling water before the partition heat exchanger is 17°C, the flow rate of the cooling water before entering the partition heat exchanger is controlled at 1500L / min, and the temperature of the cooled desulfurization liquid is controlled at 28°C.

[0042] In this embodiment, the rest of the process steps, process parameters, and processing equipment used are ...

Embodiment 3

[0045] 1) Control the initial temperature of the coke oven gas entering the desulfurization tower to be 30°C, and control the initial temperature of the desulfurization liquid entering the desulfurization tower from the top of the desulfurization tower to be 30°C;

[0046] 2) In the desulfurization tower, when the desulfurization liquid flows out from the upper packing layer and before entering the lower packing layer, the desulfurization liquid between the upper packing layer and the lower packing layer is cooled by a partition wall heat exchanger, and the flow into the partition wall is controlled. The temperature of the cooling water before the partition heat exchanger is 18°C, the flow rate of the cooling water before entering the partition heat exchanger is controlled at 1400L / min, and the temperature of the cooled desulfurization liquid is controlled at 30°C.

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Abstract

The invention discloses a desulfurization method of coke oven gas. By controlling the temperature of desulfurization liquid, which enters a desulfurization tower from the top of the desulfurization tower, in a reasonable range, the desulfurization rate of upper filling material layer in the desulfurization tower can be improved. In the desulfurization tower, after the desulfurization liquid flows out the upper filling material layer, before the desulfurization liquid flows into the lower filling material layer, the desulfurization fluid between the upper filling material layer and the lower filling material layer is cooled so as to control the temperature of the desulfurization liquid in a proper range to achieve a high desulfurization rate, and thus the desulfurization rate of the lower filling material layer in the desulfurization tower is increased. Through the technical scheme mentioned above, high desulfurization rate can be achieved along the whole flowing route of desulfurization liquid in the desulfurization tower, thus the desulfurization rate of desulfurization tower is prominently improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of coke oven gas purification, in particular to a method for desulfurizing coke oven gas. Background technique [0002] Coke oven gas refers to a kind of combustible gas produced by preparing coking coal from several kinds of bituminous coal, after high-temperature dry distillation in the coking oven, and producing coke and tar. It is a by-product of the coking industry. The main components of coke oven gas are water vapor, hydrogen, methane, tar gas, benzene vapor, naphthalene vapor, ammonia, carbon monoxide, carbon dioxide, hydrogen sulfide, hydrogen cyanide and other gases. [0003] With the improvement of environmental protection requirements, it is necessary to purify the coke oven gas produced by the coke oven to remove various impurities such as hydrogen sulfide, hydrogen cyanide, ammonia, tar and naphthalene, so that it can meet the national or industry standards. Supply to industrial or civil users...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/00C10K1/08
Inventor 梁永飞张敏王贺红朱宁征李祝涛
Owner SHANDONG IRON & STEEL CO LTD
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