Hydrogen sulfide in coke oven gas
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1. How is hydrogen sulfide formed in coke oven gas? During the coking process, part of the sulfur in the coaling coal, under high temperatures, primarily forms inorganic hydrogen sulfide, along with small amounts of organic sulfides (such as sulfur dioxide and thiophene). Organic sulfides continue to react at higher temperatures, being converted almost entirely into hydrogen sulfide; the sulfur contained in hydrogen sulfide within the gas accounts for over 90% of the total sulfur content in the gas. 2. What are the main physical properties of hydrogen sulfide? At room temperature, hydrogen sulfide is a gas with a pungent odor; its density is 1.539 kg/m3. When burned, it produces sulfur dioxide and water; it is toxic, and even a concentration of 0.1% in the air can be fatal to humans. At the same time, hydrogen sulfide is highly corrosive to steel equipment. 3. What is the content of hydrogen sulfide in gas? The hydrogen sulfide content in coke oven gas mainly depends on the sulfur content of the coal used as feedstock. During high-temperature coking, about 25–30% of the sulfur in coal is transferred into the coal gas. The sulfur content in coal in our country is low; the hydrogen sulfide concentration in coke oven gas is generally 4.5–6.0 g/m3 before the benzene washing tower, and 4–4.5 g/m3 after it. 4. Why is it necessary to remove hydrogen sulfide from coke oven gas? Hydrogen sulfide in coke oven gas is a harmful substance that corrodes equipment used for the recovery of chemical products as well as equipment for the storage and transportation of gas. Using coke oven gas with high hydrogen sulfide levels in steelmaking reduces the quality of the steel ； Used in ammonia synthesis, it can poison catalysts and corrode equipment ； When used as city gas, sulfur dioxide produced by the combustion of hydrogen sulfide is toxic, thereby damaging environmental hygiene and affecting human health. Therefore, it is very important to remove hydrogen sulfide during the coke oven gas purification process.
1. Hydrogen sulfide in coke oven gas is primarily formed by the transformation of coaling coal at high temperatures, and most of it exists in inorganic form. 2. Hydrogen sulfide is a toxic gas with a pungent odor; it can corrode steel and is deadly even at very low concentrations in the air. 3. The hydrogen sulfide content in coke oven gas depends on the sulfur content of the raw coal; it is typically 4.5–6.0 g/m3 before the benzene washing tower, and 4–4.5 g/m3 after it. 4. Removing hydrogen sulfide is to prevent corrosion of equipment, protect environmental hygiene, and ensure the quality of end products such as steel and synthetic ammonia. .