The relationship between sulfur content in the coal used for firing and hydrogen sulfide in the gas
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Hello, experts. I would like to ask: what is the relationship between the sulfur content in the coal used in furnaces and the hydrogen sulfide content in the gas? Specifically, 1% sulfur content corresponds to 10 g/Nm3. How is this determined?
Sulfur in the coal used for firing is decomposed at high temperatures, producing hydrogen sulfide in the gas. Generally, a sulfur content of 1% in the coal used for firing corresponds to a hydrogen sulfide emission concentration of 10 g/Nm3. This ratio is derived from experiments and empirical experience. It should be noted, however, that the specific values are also affected by the quality of the coal used in the furnace and the combustion conditions. .
Can this correspondence only be established through experiments and experience? Are there any theoretical formulas or empirical formulas?
This post was last edited by wangshaobo on 2023-10-7 at 20:40. It’s very simple; I’ll explain it to you using the math knowledge that elementary school students have. In the high-temperature dry distillation of coal (i.e., coking), 60–70% of the sulfur in coal ends up in the coke; in other words, 30–40% of the sulfur goes into the coal gas, with an average value of 35%. Assuming that 1 ton of coal fed into the furnace contains 1% sulfur, the amount of sulfur that ends up in the raw gas during coking of 1 ton of coal is: 1 ton × 1% × 35% = 0.0035 tons = 3.5 kg = 3500 grams. According to the correspondence S→H2S, the amount of hydrogen sulfide produced is: 3500g ÷ 32 × 34 = 3700g. One ton of coal can produce 300–350 Nm3 of gas; when it comes to raw gas, the value of 340 Nm3 is used for calculation. So, the hydrogen sulfide content in the waste gas is: 3700g ÷ 340 Nm3 = 10.88 g/Nm3