Thermodynamic evaluation of integrated gasification combined cycle: Comparison between high‐ash and low‐ash coals

In the present study, a coal‐integrated gasification combined cycle power plant is simulated. A high‐ash coal and low‐ash coal are considered to compare the performance of the plant. The combined cycle is in typical commercial size with 450 MW capacity. The feeds are Tabas and Illinois #6 coals which approximately contain more than 30% and 10% ash and have higher heating values of 22.7 MJ/kg and 26.8 MJ/kg, respectively. Energy and exergy analyses are done by aspen plus ^® and ees , respectively. Energy analysis shows that the overall efficiencies of power plants using high‐ash and low‐ash coals are 33% and 28%, respectively. The result shows that in high‐ash case, 52 kg/s coal, 10 kg/s water, and 1050 kg/s air and in low‐ash case, 48 kg/s coal and 820 kg/s air are required for providing mentioned power, approximately. Exergy analysis shows that maximum exergy destruction is in heat recovery steam generator unit. Investigating the emissions shows that high percent of ash in the coal composition has slight effects on the IGCC pollution. Finally, from thermodynamic viewpoint, it is concluded that the high‐ash coal, like the conventional one, can be used as thermally efficient and environmentally compatible feed of IGCCs. Copyright © 2016 John Wiley & Sons, Ltd.     

Comparison study on different ITM‐integrated MCFC hybrid systems with CO2 recovery using sweep gas

Previous study shows the ITM (oxygen ion transfer membrane)‐integrated MCFC (molten carbonate fuel cell) hybrid system with CO₂ recovery can maintain high efficiency; however, the oxygen partial pressure on the ITM permeate side is usually 1 atm, which requires a very high pressure ratio of the ITM air compressor in order to separate the oxygen; using the sweep gas can solve this problem. In this paper the ITM‐integrated MCFC hybrid systems with CO₂ recovery using different sweep gases are studied. With the Aspen plus software, two systems with different sweep gases are established, and their performances are compared with the benchmark system without sweep gas; the effects of key parameters on the optimum system performance are also investigated. Results show that compared with the benchmark system, the efficiencies of the systems with sweep gases are increased and the pressure ratios of the air compressors are decreased; the system using pure CO₂ as sweep gas can improve the system efficiency by 1.25%, which is superior to the system using the mixture gas of CO₂ and H₂O as sweep gas. Achievements from this paper will provide a valuable reference for CO₂ recovery from the MCFC hybrid power system with lower energy consumption. Copyright © 2016 John Wiley & Sons, Ltd.     

尿素在杨木APMP漂白过程中的影响

该实验探讨了在杨木碱性过氧化氢机械浆（APMP）漂白中加入尿素对纸浆ISO白度和打浆性能的影响以及在尿素存在的情况下过氧化氢（H2O2）漂白的最佳工艺。结果表明,加入尿素能提高纸浆白度,并且对纸浆的物理强度没有明显的影响,同时能降低生产成本和减轻后续处理的负担。     

河北幼龄速生杨的化学组成

对速生杨木化学组成进行较深入分析研究 ,表明与草类原料相比 ,其更易于造纸。我国阔叶木并不匮乏 ,人工培养的速生材如杨木具有广阔的前景 ,加速开发速生材造纸 ,既有必要 ,也有可能     

黑液等温膨胀体积指数（VIE）测定方法研究

提出一种简易快速的黑液等温膨胀体积指数（ＶＩＥ）的测定方法，若样品采取蒸发站出效浓黑液，无需预处理可直接测定。整个测定过程只需２．５ｈ，测定值重复性好，变异系数为０．００８１５。     

杨木APMP工艺特点及应用

本文通过介绍杨木ＡＰＭＰ制浆工艺流程，主要设备，技术指标，质量指标，论述了采用杨木ＡＰＭＰ抄造高档、低定量胶印新闻纸的可行性。     

杨木APMP制浆中的浸渍吸收性能

以杨木为原料，研究了碱性过氧化氢机械法制浆（APMP）的关键制浆工艺。采用中国制浆造纸工业研究所自制的挤碾机，重点研究了影响木片挤碾浸渍吸收性能的因素，及其对碱性过氧化氢化学预处理、成浆性能的影响。制得了白度、强度性能优良的纸浆。     

汽蒸爆破法制杨木高得率浆

采用汽蒸爆破法制杨木高得率浆。探讨了化学药品用量、预处理温度和时间、助剂等对爆破法纸浆性质的影响；观察了爆破制浆过程中纤维形态的变化；进行了爆破法纸浆可漂性及其配抄新闻纸可行性的研究。     

高得率浆发展现状及趋势（续）

．３ＡＰＭＰ、ＡＰＰ及ＡＰ－ＴＭＰＡＰＭＰ及ＡＰＰ同属碱性过氧化氢化学预浸渍化学机械浆系列。１９８８年Ｓｃｏｔ公司开发碱性过氧化氢化机浆制造工艺，称为ＡＰＰ法，或“Ｍ”法。１９９１年在加拿大ＭｅａｄｏｗＬａｋｅ建立年产量２４万吨的杨木漂白ＡＰＰ工厂。...     

杨木爆破浆作新闻纸配浆的初步研究

进行了杨木爆破浆配抄新闻纸的研究，杨木爆破浆取代马尾松化学浆配抄新闻纸后除撕裂度略有下降外，裂断长、拉毛速度、印刷密度、透印值等都有明显改善