洁净煤技术

2019, (04) 26-32

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低温甲醇洗典型异常工况尾气硫含量模拟控制及优化
Simulation and optimization of sulfur content of tail gas under typical abnormal operation conditions of rectisol

葛晓东;
GE Xiaodong

摘要(Abstract):

煤气化生产过程中,合成气中混杂有H_2S、CO_2等酸性气体,尤其是H_2S会造成后续工序中催化剂中毒和环境污染。低温甲醇洗是典型的依靠物理方法吸收酸性气体的净化工艺,对气体吸收具有很好的选择性。在低温条件下甲醇对H_2S等酸性气体具有较大的溶解度,而对合成气中的CO和H_2溶解度较小。因此低温甲醇洗技术被广泛应用于合成气的净化。但实际生产过程中,由于合成气组分含量差别或操作参数改变会使放空尾气中硫含量出现波动,对稳定生产造成一定影响,亟需对其波动原因及调控方案开展深入研究。以企业生产运行数据为基础,分析了原料煤和尾气中硫含量变化关系,利用Aspen Plus模拟软件对低温甲醇洗工艺流程进行了建模和全流程模拟,通过比较模拟值与实际生产值,发现吻合程度较好,获得了具有较高可靠性的模型。在模型可靠性研究的基础上,对尾气硫含量影响较大的2个工艺参数(即甲醇吸收塔中段甲醇回流率和CO_2解析塔塔顶温度)为优化对象,分析了甲醇吸收塔中段甲醇回流率、CO_2解析塔塔顶温度影响尾气硫含量的主要原因,及其对其他物料流股的影响。通过灵敏度分析工具,探索了进料中H_2S气体含量超标时3个典型异常进料情况下控制尾气硫含量的最佳操作条件。典型异常工况的优化条件为:1~3号异常工况进料中H_2S体积分数分别为0. 52%、0. 42%、0. 35%,甲醇回流率分别调整为58%、58%、59%,CO_2解吸塔顶温度调整为-57、-56、-55℃。
Abstract:During coal gasification,the synthesis gas usually contains a proportion of acidic gas,such as H2S and SO2,especially,excessive H2S could induce the catalyst damage and environmental pollution.The low temperature methanol has high solvent capacity for H2S,whereas,low capacity for CO and H2.Thus,the rectisol process using the low temperature methanol as the adsorbing medium has been widely used in purification of synthesis gas,which is an essential purification process for major gasification plants.However,the systematic study on the tail gas control is insufficient due to the irregular variation of the gas component and operational parameters in the industrial process.The factors influencing the tail gas out of limit should be clarified,and the possible regulating scheme should be specified.Based on the data from the industry,the simulation of rectisol process was set up by using Aspen Plus software.After comparing the simulated process data of rectisol with the industrial parameters,a high reliability model was obtained.According to the reliability analysis,two process parameters,i.e.,reflux rate in the middle part of methanol absorption tower,top temperature of carbon dioxide desorption tower,were found have critical influence on the sulfur content of the tail gas.Sensitivity tools were used to explore the optimal operating conditions on controlling the tail gas sulfur content at three abnormal feeding conditions.Thus,it can provide theoretical basis and data support for the actual production of the enterprise.The optimal conditions for typical abnormal working conditions are as follows:the volume fraction of H2S in the feed of abnormal working conditions No.1-3 is 0.52%,0.42%,0.35% respectively,methanol reflux rate is adjusted to be 58%,58%,59%,and the temperature at the top of the CO2 desorb tower are adjusted to be -57,-56,-55 ℃.

关键词(KeyWords): Aspen Plus;低温甲醇洗;灵敏度分析;尾气硫;模拟
Aspen Plus;rectisol;sensitivity analysis;tail gas sulfur;simulation

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作者(Author): 葛晓东;
GE Xiaodong

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