溶剂发泡对天然气净化装置的影响分析

Analysis on Influence of Solvent Foaming on Natural Gas Purification Unit

甲基二乙醇胺(MDEA)是天然气净化工业中常用的脱硫剂,溶剂发泡常见于该类脱硫剂,会影响装置平稳生产,严重时造成冲塔事故。分析了溶剂发泡原因,对装置的影响及原理,并对消泡后的操作给出建议。结果表明:溶剂发泡主要是泡沫的累积,在体系中泡沫生成容易,生成速度大于消泡速度;发泡后,溶剂对羰基硫的吸收能力增强,湿气中羰基硫质量分数下降29.6%,闪蒸罐液位会不断上涨,再生塔液位下降,塔顶温度平均上升3.14℃,回流量增加436kg·h^(-1);消泡后装置短时波动较大,应注意液位控制,根据酸性气量调整克劳斯炉配风。

Methyldiethanolamine is a commonly used desulfurizer in purification and production of natural gas,which is easy to foam,causing production fluctuation and tower flushing accident in severe cases.In this paper,the cause of solvent foaming,the influence on the device and its principle were discussed,and suggestions for operation after defoaming was given.The results showed that the solvent foaming was mainly due to the accumulation of foam,which was easy to generate in the system,and the generation speed was greater than the defoaming speed.After solvent foaming,the absorption capacity of the solvent for carbonyl sulfide was enhanced,and the content of carbonyl sulfide in the wet purified gas decreased by 29.6%,the liquid level of the flash tank would continue to rise,while that of the regeneration tower would drop,the temperature at the top of regeneration tower increased by an average of 3.14℃, with the increase of 436 kg·h^(-1) of return flow.After defoaming,the device demonstrated a fluctuation greatly in a transitory time,so it should be adjusted in time,and the air distribution of Claus furnace should be adjusted according to the flow rate of acid gas.