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New controllable premixed combustion for dimethyl ether engine

Science Bulletin 2003年第11期48卷 1157-1160页

作者： SONG Jun HUANG Zhen QIAO Xinqi WANG Wanli FANG Junhua ZHANG Guangde China School of Mechnical and Power Engineering Shanghai Jiaotong Unversity Shanghai Jiaotong Unversity Shanghai 200030

A new concept of the controllable premixed combustion (CPC) system was proposed for dimethyl ether (DME) to explore a new approach to achieving ultra-low NOX emissions with the zero level of particulate matter exhaust emissions. The DME fuel was injected into the premix chamber by means of the electronically controlled low pressure injection system, then the mixture formation and combustion process were controlled with a control-valve set between the main chamber and the premix chamber. The test bench was constructed based on a single diesel engine. Preliminary studies demonstrated that ultra-low NOX emissions had been realized with zero particulate matter emissions under the optimum specifications of the DME engine, NOX emissions were less than 65 10-6. According to the engine combustion analysis, it was found that the control-valve played an important role in the pre-mixture formation and ignition timing.

关键词： dimethyl ether controllable premixed combustion emission performance combustion characteristic.

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Permitted emissions of major air pollutants from coal-fired power plants in China based on best available control technology

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Frontiers of Environmental Science & Engineering 2018年第5期12卷 62-74页

作者： Xiaohui Song Chunlai Jiang Yu Lei Yuezhi Zhong Yanchao Wang Atmospheric Environment Department Chinese Academy for Environmental PlanningBeijing 100012China College of Environmental Science and Engineering Nankai UniversityTianjin 300350China

Based on the activity level and technical information of coal-fired power-generating units(CFPGU)obtained in China from 2011 to 2015,we,1)analyzed the time and spatial distribution of SO_(2) and NOx emission performance of CFPGUs in China;2)studied the impact of installed capacity,sulfur content of coal combustion,and unit operation starting time on CFPGUs’pollutant emission performance;and 3)proposed the SO_(2) and NOx emission performance standards for coal-fired power plants based on the best available control technology.Our results show that:1)the larger the capacity of a CFPGU,the higher the control level and the faster the improvement;2)the CFPGUs in the developed eastern regions had significantly lower SO_(2) and NOx emission performance values than those in other provinces due to better economic and technological development and higher environmental management levels;3)the SO_(2) and NOx emission performance of the Chinese thermal power industry was significantly affected by the single-unit capacity,coal sulfur content,and unit operation starting time;and 4)based on the achievability analysis of best available pollution control technology,we believe that the CFPGUs’SO_(2) emission performance reference values should be 0.34 g/kWh for active units in general areas,0.8 g/kWh for active units in high-sulfur coal areas,and 0.13 g/kWh for newly built units and active units in key areas.In addition,the NOx emission performance reference values should be 0.35 g/kWh for active units in general areas and 0.175 g/kWh for new units and active units in key areas.

关键词： Coal-fired power-generating units(CFPGU) emission performance Best available control technology

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