The sulfides contained in coke oven gas are harmful substances produced in the production process, which not only pollute the environment, but also cause corrosion to production equipment. Therefore, desulfurization of coke oven gas is necessary. This article will introduce the method and process flow of sulfur dioxide removal from coke oven gas, as well as the relevant technical principles and operation points.
1. The significance of coke oven gas desulfurization.
Coke oven gas is a by-product of the coke production process and contains a large amount of sulfides, such as hydrogen sulfide, sulfur dioxide, etc. These sulfides not only cause serious pollution to the environment, but also cause corrosion to production equipment, affecting the normal operation and service life of equipment. Therefore, it is of great significance to desulfurize coke oven gas.
Second, the method of desulfurization of coke oven gas.
At present, there are two main methods of desulfurization of coke oven gas: wet desulfurization and dry desulfurization. Wet desulfurization mainly uses chemical absorbents to absorb sulfides from coal gas, and then separates the sulfur in the absorbents through the regeneration process; Dry desulfurization mainly uses physical adsorbents to adsorb sulfides from coal gas.
3. The process flow of coke oven gas desulfurization.
1.Wet desulfurization process.
The wet desulfurization process mainly includes three parts: absorption, regeneration and sulfur**. The absorption part is to mix the coke oven gas containing sulfide with the absorbent, so that the sulfide and the absorbent undergo a chemical reaction to generate separable salts; The regeneration part is to restore the original desulfurization capacity of the absorbent absorbed by the sulfide through heating, separation and other operations; The sulfur part is to separate the sulfur from the regenerated absorbent for utilization.
2.Dry desulfurization process.
The dry desulfurization process mainly includes three parts: adsorption, desorption and sulfur**. The adsorption part is to pass the coke oven gas containing sulfide through the adsorbent layer, so that the sulfide is adsorbed by the adsorbent; The desorption part is to release the adsorbed sulfide by heating and other operations to release the adsorbed sulfide; The sulfur part is the use of the desorption sulfide.
Fourth, the relevant technical principles and operational points.
1.Principle and operation points of wet desulfurization technology.
Wet desulfurization technology mainly uses absorbents to chemically react with sulfides to generate separable salts. Commonly used absorbents are sodium carbonate, tannin gum, tartaric acid, etc. The reaction equation is as follows:
na2co3+2h2s=na2s+co2+3h2o
Tannin gum + H2S = tannin HS precipitation + tannin ion.
Tartaric acid + H2S = tartaric acid HS precipitation + tartaric acid ions.
In the process of operation, it is necessary to control the absorption temperature, absorption pressure, absorbent concentration and other parameters to ensure the absorption effect and the normal operation of the equipment. At the same time, attention should be paid to preventing problems such as corrosion and clogging of equipment.
2.Principle and operation points of dry desulfurization technology.
Dry desulfurization technology mainly uses the adsorption of adsorbents to separate sulfides from coke oven gas. Commonly used adsorbents are activated carbon, molecular sieves, etc. The reaction equation is as follows:
Activated carbon surface + SO2 = activated carbon surface SO2
Molecular sieve surface + SO2 = molecular sieve surface SO2 + water molecules.
In the process of operation, it is necessary to control the adsorption temperature, adsorption pressure, adsorbent filling amount and other parameters to ensure the adsorption effect and the normal operation of the equipment. At the same time, attention should be paid to preventing problems such as adsorbent crushing and pulverization.
V. Conclusions. Through the desulfurization treatment of coke oven gas, it can effectively reduce the harmful substances it contains, reduce environmental pollution and corrosion of equipment. Wet desulfurization and dry desulfurization are two commonly used methods for desulfurization of coke oven gas, and the appropriate process flow and technical parameters should be selected according to the specific situation in practical application. At the same time, technology research and development and innovation should be strengthened to improve the efficiency and effect of coke oven gas desulfurization, and contribute to environmental protection and sustainable development.