Hydrogenation of tail gas from sulfur plant
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What is the purpose of hydrogenating the tail gas of a sulfur plant? Are there any good benefits? Don’t know much about it? Please solve your doubts!
Recover the sulfur in the exhaust gas and hydrogenate it to generate hydrogen sulfide!
The reason why the exhaust gas of the sulfur plant needs to be hydrogenated is mainly because the CLAUS sulfur recovery unit has a large amount of exhaust gas due to various reasons, and the exhaust gas contains sulfur oxides, sulfides, gaseous sulfur and carries a lot of liquid sulfur droplets and foam, so it cannot be discharged up to the standard. Therefore, the tail gas needs to be hydrogenated and converted into hydrogen sulfide, and then enters the main flow of the CLAUS device to participate in the cycle reaction and be converted into liquid sulfur for recovery.
In order to reduce the investment and operating costs of the sulfur tail gas hydrogenation unit, the professional sulfur tail gas hydrogenation process package requires gas-liquid defoaming separation equipment before the sulfur tail gas enters the hydrogenation unit. The feather-type high-efficiency gas-liquid defoaming separator is used to efficiently and long-term stably remove the liquid sulfur droplets carried by the tail gas inlet. This greatly reduces the size of the tail gas hydrogenation unit, catalyst loading, catalyst consumption and hydrogen consumption, which plays an important role in the investment and operating costs of the tail gas hydrogenation unit. About the feather-leaf liquid sulfur high-efficiency defoaming separator for sulfur tail gas, in http://bbs.hcbbs.com/thread-1354814-1-1.html More technical information can be found for further discussion.
H2S and part of CO2 in the exhaust gas are absorbed by 40% (W) imported high-efficiency desulfurization solvent. The purified tail gas after absorption is then washed with alkali liquid to remove the remaining H2S in the tail gas. The purified tail gas is thermally incinerated to convert the remaining sulfur compounds into SO2, which is then discharged to the atmosphere through the chimney. ； The rich liquid is heated and stripped for regeneration in the regeneration tower. After regeneration, the lean liquid returns to the tail gas absorption tower (T-102) for recycling. At the same time, the released H2S and CO2 are returned to the Calus system from the top of the regeneration tower. After the sulfur tail gas is treated, the SO2 in the tail gas is ≤100mg/m3, and the total recovery rate of sulfur can reach 99.9%.
If the exhaust gas does not meet the standard, it needs to be hydrogenated and further removed before it can reach the standard.