The QDB-5 sulfur tolerant CO shift catalyst, with anti-methanation property by supported compositing alkali promoters, has been proved to effectively reduce the outlet methane content in the condition of a low water g...The QDB-5 sulfur tolerant CO shift catalyst, with anti-methanation property by supported compositing alkali promoters, has been proved to effectively reduce the outlet methane content in the condition of a low water gas ratio. Thus, a new technology based on a lower water/gas ratio than before has been developed with the new catalyst. The CO conversion at lower temperatures and catalyst stability were confirmed by long term industrial application. The high temperature catalyst performance also showed a better result than the conventional commercial catalyst, with higher CO conversion and well controlled methane outlet. Our research and the industrial application of catalyst have shown the importance of alkali metals as core promoters for such kind of catalysts.展开更多
In order to investigate the chloride ion penetration resistance of coal gangue concrete under multi-factor comprehensive action, the non-steady-state accelerated chloride ion migration test was used to test the chlori...In order to investigate the chloride ion penetration resistance of coal gangue concrete under multi-factor comprehensive action, the non-steady-state accelerated chloride ion migration test was used to test the chloride diffusion law of coal gangue concrete specimens by crack width, curing temperature and water-cement ratio. Three groups of crack width (0 mm, 0.05 - 0.12 mm, 0.12 - 0.2 mm), three curing temperatures (high temperature 45, medium temperature 25, low temperature 10), three water cement ratios (0.3, 0.4, 0.5) were set in the experiment. The results show that when the curing temperature and water cement ratio are constant, the crack width less than 0.12 mm has little effect on the chloride content and chloride diffusion coefficient. When the crack width is larger than 0.12 mm, the chloride penetration depth increases with the crack width. The resistance to chloride ion penetration of gangue concrete is greatly influenced by the water cement ratio. The influ-ence degree of three factors on chloride ion migration coefficient of gangue concrete is as follows: water cement ratio > crack width > curing temperature.展开更多
Gasification unit is one of the key subsystems in the IGCC power system;the operating parameters of gasifier directly affect syngas quality and performance of whole IGCC system. The system model of gasification unit w...Gasification unit is one of the key subsystems in the IGCC power system;the operating parameters of gasifier directly affect syngas quality and performance of whole IGCC system. The system model of gasification unit with coal water slurry gasifier was simulated and calculated using THERMOFLEX software, and the relations of oxygen coal ratio (Roc), water coal ratio (Rsc), gasification pressure, gasification temperature and cold gas efficiency were mostly researched. The results show that Roc and Rsc have effect of mutual restriction on gasification temperature, cold gas efficiency and syngas composition. Gasification pressure mainly determines the capacity of the gasifier, little effects on syngas composition.展开更多
致密含水气藏具有低压、低孔、低渗、非均质性强、含气饱和度低以及孔喉细小等储层特征。为了研究提高配产对致密含水气藏气井开发效果的影响,对比分析了提高配产前后不同提高配产比例和不同液气比气井的压力、单井最终可采储量(EUR)及...致密含水气藏具有低压、低孔、低渗、非均质性强、含气饱和度低以及孔喉细小等储层特征。为了研究提高配产对致密含水气藏气井开发效果的影响,对比分析了提高配产前后不同提高配产比例和不同液气比气井的压力、单井最终可采储量(EUR)及阶段累产气等开发参数。研究结果表明:1)提高配产比例及气井液气比越大,气井EUR下降幅度也越大;当气井提高配产比例大于50%或液气比大于5 m^(3)/(×10^(4) m ^(3))时,EUR下降比例可达40%。2)致密含水储层应力敏感程度增幅7%~12%,且含水饱和度越高,应力敏感程度越强,渗透率急剧降低。3)生产压差增大,参与流动的地层水增多,近井地带更易积液且积液范围将扩展至地层中部,造成采收率大幅下降。4)井筒内液滴回落,流体侵入储层容易引起近井地带水锁,造成气相渗流能力大幅下降。该研究成果对同类型含水气藏科学合理开发有指导意义。展开更多
文摘The QDB-5 sulfur tolerant CO shift catalyst, with anti-methanation property by supported compositing alkali promoters, has been proved to effectively reduce the outlet methane content in the condition of a low water gas ratio. Thus, a new technology based on a lower water/gas ratio than before has been developed with the new catalyst. The CO conversion at lower temperatures and catalyst stability were confirmed by long term industrial application. The high temperature catalyst performance also showed a better result than the conventional commercial catalyst, with higher CO conversion and well controlled methane outlet. Our research and the industrial application of catalyst have shown the importance of alkali metals as core promoters for such kind of catalysts.
文摘In order to investigate the chloride ion penetration resistance of coal gangue concrete under multi-factor comprehensive action, the non-steady-state accelerated chloride ion migration test was used to test the chloride diffusion law of coal gangue concrete specimens by crack width, curing temperature and water-cement ratio. Three groups of crack width (0 mm, 0.05 - 0.12 mm, 0.12 - 0.2 mm), three curing temperatures (high temperature 45, medium temperature 25, low temperature 10), three water cement ratios (0.3, 0.4, 0.5) were set in the experiment. The results show that when the curing temperature and water cement ratio are constant, the crack width less than 0.12 mm has little effect on the chloride content and chloride diffusion coefficient. When the crack width is larger than 0.12 mm, the chloride penetration depth increases with the crack width. The resistance to chloride ion penetration of gangue concrete is greatly influenced by the water cement ratio. The influ-ence degree of three factors on chloride ion migration coefficient of gangue concrete is as follows: water cement ratio > crack width > curing temperature.
文摘Gasification unit is one of the key subsystems in the IGCC power system;the operating parameters of gasifier directly affect syngas quality and performance of whole IGCC system. The system model of gasification unit with coal water slurry gasifier was simulated and calculated using THERMOFLEX software, and the relations of oxygen coal ratio (Roc), water coal ratio (Rsc), gasification pressure, gasification temperature and cold gas efficiency were mostly researched. The results show that Roc and Rsc have effect of mutual restriction on gasification temperature, cold gas efficiency and syngas composition. Gasification pressure mainly determines the capacity of the gasifier, little effects on syngas composition.
文摘致密含水气藏具有低压、低孔、低渗、非均质性强、含气饱和度低以及孔喉细小等储层特征。为了研究提高配产对致密含水气藏气井开发效果的影响,对比分析了提高配产前后不同提高配产比例和不同液气比气井的压力、单井最终可采储量(EUR)及阶段累产气等开发参数。研究结果表明:1)提高配产比例及气井液气比越大,气井EUR下降幅度也越大;当气井提高配产比例大于50%或液气比大于5 m^(3)/(×10^(4) m ^(3))时,EUR下降比例可达40%。2)致密含水储层应力敏感程度增幅7%~12%,且含水饱和度越高,应力敏感程度越强,渗透率急剧降低。3)生产压差增大,参与流动的地层水增多,近井地带更易积液且积液范围将扩展至地层中部,造成采收率大幅下降。4)井筒内液滴回落,流体侵入储层容易引起近井地带水锁,造成气相渗流能力大幅下降。该研究成果对同类型含水气藏科学合理开发有指导意义。
