Characteristics of acidic gases and sulfur recovery in the coal chemical industry

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This post was last edited by adsl121 on 2009-10-17 01:29. Characteristics of acidic gases in the coal chemical industry: 1. The concentration of acidic gases is generally in the range of 20% to 30% for H2S; using air cannot ensure stable combustion, and it can lead to problems such as failure to ignite and carbon buildup. To address this issue, the process generally uses oxygen-enriched or pure oxygen (O2 ≥ 28%–100%) instead of air for combustion. Oxygen supply is generally not a problem for coal chemical enterprises. At the same time, investment is significantly reduced due to the smaller size of the equipment. 2 The acid gas concentration in coal chemical enterprises is complex; typical gases contain impurities such as olefins, COS, HCN, NH3, CH3OH, etc. If methanol and higher olefins are not treated, it will lead to severe carbon deposition; in mild cases, this reduces the catalyst’s lifespan and results in sulfur products that do not meet quality standards. In severe cases, it will cause the catalyst bed to become clogged, preventing the plant from operating. If NH3 and HCN are not treated, it will cause corrosion and blockage of the equipment as well as catalyst failure. Various sulfur compounds, if left untreated, may fail to meet the emission requirements. Characteristics of sulfur recovery in the coal chemical industry: 1. The scale of sulfur recovery units is relatively small. 2. The concentration of acidic gases is low. 3. The composition of acidic gases is complex. 4. The concentration of acidic gases fluctuates greatly. 5. There is a shortage of hydrogen sources but an abundance of oxygen