富含二氧化碳的天然气分离及其利用

论述了国内外对富含二氧化碳的天然气分离技术的研究进展,包括：膜分离法、变压吸附（PSA）法、物理吸收法和化学吸收法等,并分析了天然气资源的深加工利用及其产品开发前景。     

Lignite‐fired air‐blown IGCC systems with pre‐combustion CO2 capture

Detailed analyses based on mass and energy balances of lignite‐fired air‐blown gasification‐based combined cycles with CO₂ pre‐combustion capture are presented and discussed in this work. The thermodynamic assessment is carried out with a proprietary code integrated with Aspen Plus^® to carefully simulate the selective removal of both H₂S and CO₂ in the acid gas removal station. The work focuses on power plants with two combustion turbines, with lower and higher turbine inlet temperatures, respectively, as topping cycle. A high‐moisture lignite, partially dried before feeding the air‐blown gasification system, is used as fuel input. Because the raw lignite presents a very low amount of sulfur, a particular technique consisting of an acid gas recycle to the absorber, is adopted to fulfill the requirements related to the presence of H₂S in the stream to the Claus plant and in the CO₂‐rich stream to storage. Despite the operation of the H₂S removal section representing a significant issue, the impact on the performance of the power plant is limited. The calculations show that a significant lignite pre‐drying is necessary to achieve higher efficiency in case of CO₂ capture. In particular, considering a wide range (10–30 wt.%) of residual moisture in the dried lignite, higher heating value (HHV) efficiency presents a decreasing trend, with maximum values of 35.15% and 37.12% depending on the type of the combustion turbine, even though the higher the residual moisture in the dried coal, the lower the extraction of steam from the heat recovery steam cycle. On the other hand, introducing the specific primary energy consumption for CO₂ avoided (SPECCA) as a measure of the energy cost related to CO₂ capture, lower values were predicted when gasifying dried lignite with higher residual moisture content. In particular, a SPECCA value as low as 2.69 MJ/kg_CO2 was calculated when gasifying lignite with the highest (30 wt.%) residual moisture content in a power plant with the advanced combustion turbine. Ultimately, focusing on the power plants with the advanced combustion turbine, air‐blown gasification of lignite brings about a reduction in HHV efficiency equal to almost 1.5 to 2.8 percentage points, depending on the residual moisture in the dried lignite, if compared with similar cases where bituminous coal is used as fuel input. Copyright © 2016 John Wiley & Sons, Ltd.     

MDEA脱硫溶液腐蚀性能影响因素研究

利用电化学方法在MDEA溶液介质中对20#、20R、304不锈钢、316L四种材质在不同工况下的腐蚀行为进行了室内模拟评价。结果表明,碳钢在气相和液相中的腐蚀速率随温度升高而增加。在相同条件下,20#和20R在气相中的腐蚀速率高于液相。实验条件下,未通入H2S的胺液对各材质均无明显的电化学腐蚀,通入H2S至饱和的胺液在运行一段时间后碳钢的气相腐蚀速率增加。实验过程中,均未检测到不锈钢304及316L的电化学腐蚀倾向。     

MDEA脱硫溶液近红外光谱法在线分析技术研究北大核心CSCD

目的为保证天然气净化装置产品气质量达标,剑阁天然气净化厂首次利用近红外光谱法在线分析技术实现脱硫溶液组分快速、准确地测定,便于脱硫系统工艺参数及时调整。方法通过反复优化“建模数据”与“建模算法”,建成了最优的脱硫溶液组分近红外光谱分析模型。结果通过多组在线分析数据与实验室分析数据对比分析,发现分析结果偏差均在2%以内,表明近红外光谱技术能准确监测脱硫溶液中MDEA含量及水含量。结论近红外光谱法在线分析技术的成功应用为脱硫系统连续补水提供及时、准确的数据支撑,保证天然气净化装置脱硫稳定运行,具有极其重要的推广应用意义。