MDEA胺液再生塔失效机理及其对策分析

某MDEA胺液再生塔在运行中出现渗漏,为从过程风险角度确定失效机理,对运行工艺进行了分析。通过采用宏观检查、力学性能试验、化学成分分析、能谱分析、断口形貌分析、金相分析、硬度测定等方法,对试样进行失效分析。结果表明,该再生塔的失效机理为碳酸盐应力腐蚀开裂,并从选材、热处理、定期检验等方面提出了对策。

活化MDEA脱碳液腐蚀试验研究

通过脱碳液腐蚀试验,模拟合成氨车间活化MDEA脱碳系统生产运行状况,考察、研究在MDEA脱碳液持续沸腾并通入CO2气体的情况下,气相和液相中碳钢挂片的腐蚀速率以及活化剂哌嗪浓度对腐蚀速率的影响。试验为探究合成氨设备局部腐蚀原因提供数据支持,有较高的参考价值。

MDEA脱碳液中铁含量测定方法探讨

介绍磺基水杨酸比色法测定MDEA脱碳液中铁含量的原理和方法,讨论了测定条件,并进行了精密度和加标回收试验。试验结果表明,该方法重现性好,准确度能满足脱碳设备腐蚀监控的分析要求。

阿姆河气田天然气脱硫脱碳MDEA吸收塔工艺的优化

针对阿姆河气田天然气脱硫脱碳过程中MDEA吸收塔工艺落后,导致贫胺液进料量调控不精确,H_2S含量无法达到或超出设计指标的情况。应用K-SPICE软件对MDEA吸收塔进行动态模拟,在贫胺液进料环节增加了H_2S流量与贫胺液进料量的反馈调节,通过分析优化结果数据和优化前后经济性比较得出优化方案切实可行。

Determination of Salt Impurities in MDEA Solution Used in Desulfurization of Highly Sulphurous Natural Gas

The foaming phenomenon of N-methyldiethanolamine(MDEA) solution used in desulfurization process occurs frequently in the natural-gas purification plant. The foaming phenomenon has a strong impact on operation of the process unit. The salt impurities are the main reason for causing the foaming of MDEA solution, so the full analysis of salt impurities is necessary. A method for comprehensive analysis of salt impurities in MDEA solution used in desulfurization process was established. Anions and non-metallic cations of MDEA solution were determined by different conditions of ion chromatograph, respectively. Metallic cations of the solution were detected by atomic absorption spectrophotometer with the N2O-C2H2 flame absorption. The analytical results of salt impurities in the desulfurization solution can provide a theoretical basis for an accurate analysis of the factors affecting the foaming of MDEA to unveil further control measures.

Absorption Rate of CO_2 into MDEA Aqueous Solution Blended with Piperazine and Diethanolanline

Absorption rate of CO2 into aqueous solution of N-methyldiethanolamine (MDEA) blended with diethanolamine (DEA) and piperazine (PZ) was studied and a kinetic model was established. It is shown that homogeneous activation mechanism could explain this absorption process. The absorption rate coefficients of carbon dioxide into MDEA aqueous solution blended with DEA, PZ or DEA+PZ were compared with each other. The results demonstrated that the different activation effect of DEA, PZ and DEA+PZ on the carbon dioxide absorption comes from the difference in CO2 combination rate, transport of PZ and DEA to MDEA and the regeneration rate of PZ and DEA.

PZ活化MDEA胺液配方发泡特性研究及预测

通过实验研究不同质量分数PZ活化MDEA胺液的发泡特性,分别在无杂质和有杂质的情况下进行发泡实验,以发泡高度和消泡时间为评价指标,分析胺液发泡特性,给出胺液的建议质量分数范围,并运用Matlab软件对实验数据进行拟合,将发泡高度和消泡时间实验数据与拟合数据进行对比。研究发现:对于无杂质情况下的PZ活化MDEA胺液,当MDEA质量分数较小时,添加少量PZ能降低胺液的发泡高度和消泡时间。当MDEA质量分数较高时,随着PZ质量分数的升高,胺液的发泡高度和消泡时间增大。在天然气脱碳胺液配方筛选时,从无杂质胺液的发泡特性角度考虑,当胺液中PZ质量分数小于6%且MDEA质量分数小于32%时,胺液不易发泡。对于含有杂质的PZ活化MDEA胺液,PZ活化MDEA胺液的发泡高度整体上随MDEA及PZ质量分数的增大而增大。在天然气脱碳胺液配方筛选时,从含有杂质的胺液发泡特性角度考虑,MDEA质量分数应控制在32%以内,PZ质量分数应小于5%。通过实验数据拟合,得到PZ活化MDEA胺液分别在无杂质及有杂质情况下的发泡高度及消泡时间的拟合公式,对比实验数据和拟合计算数据,得出拟合公式能够较为准确地预测PZ活化MDEA胺液的发泡特性。

空冷器在净化装置的应用前景

通过对天然气净化装置脱硫系统MDEA贫液后冷器和空气冷却器的对比分析,得出采用空冷式换热流程简单,相对水冷式换热器可减少水和药品消耗,并具有一定的环保效益。

二化肥脱碳系统试车总结

本文对宁夏化工厂二化肥合成氨装置试车过程中脱碳系统的开车进行了回顾和总结，对期间再生塔发生的液乏现象进行了原因分析。