A thermodynamic model was developed to analyze the performance of cogeneration plant based on irreversible recuperative Brayton cycle. A parameter, dimensionless total useful energy rate (DTUER), was used as the crite...A thermodynamic model was developed to analyze the performance of cogeneration plant based on irreversible recuperative Brayton cycle. A parameter, dimensionless total useful energy rate (DTUER), was used as the criterion for performance optimization of cogeneration plant. The effects of cycle parameters, internal irreversibilities, and recuperator efficiency on maximum DTUER and on the efficiency at maximum DTUER were numerically investigated. The relation between DTUER and cogeneration efficiency was also analyzed. The results show that there exists an optimal compressor pressure ratio which maximizes the DTUER. It is also found that there exists an optimal power-to-heat ratio which results in a dual-maximum DTUER.展开更多
以天然碱加工厂为研究对象,主体工艺流程采用“湿式分解—十水碱结晶—一水碱结晶—一水碱干燥—NaHCO3加工”,供能工艺采用“燃煤热电联产+网电”,构建了完整的天然碱加工厂碳排放核算方法。研究结果表明:天然碱加工厂产生的碳排放强度...以天然碱加工厂为研究对象,主体工艺流程采用“湿式分解—十水碱结晶—一水碱结晶—一水碱干燥—NaHCO3加工”,供能工艺采用“燃煤热电联产+网电”,构建了完整的天然碱加工厂碳排放核算方法。研究结果表明:天然碱加工厂产生的碳排放强度为622.16 kg CO_(2)eq/t,其中直接碳排放强度为473.08 kg CO_(2)eq/t,间接碳排放强度为180.28 kg CO_(2)eq/t;碳汇减少的碳排放强度为31.20 kg CO_(2)eq/t。针对天然碱加工厂碳排放高的情况,提出以下对策:增加天然碱矿石与溶采液接触时间来提高碱卤浓度,减少卤水蒸发量,降低天然碱蒸发结晶工艺对热量的需求,减少燃煤热电联产蒸汽量;选择高效设备和电机,实现电耗源头控制;强化室内试验,优化工艺参数;实施天然碱加工与新能源融合,提高绿电利用率,减少网电间接碳排放;适当提高NaHCO3产能,增加CO_(2)回收利用量。展开更多
基金Project(2011FJ1007-1) supported by the Funds of Key Science and Technology of Hunan Province, ChinaProject(YB2010B027)supported by the Funds for the Author of Provincial Excellent Doctoral Dissertation of Hunan Province, ChinaProject(KF200903)supported by the Opening Funds of Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, China
文摘A thermodynamic model was developed to analyze the performance of cogeneration plant based on irreversible recuperative Brayton cycle. A parameter, dimensionless total useful energy rate (DTUER), was used as the criterion for performance optimization of cogeneration plant. The effects of cycle parameters, internal irreversibilities, and recuperator efficiency on maximum DTUER and on the efficiency at maximum DTUER were numerically investigated. The relation between DTUER and cogeneration efficiency was also analyzed. The results show that there exists an optimal compressor pressure ratio which maximizes the DTUER. It is also found that there exists an optimal power-to-heat ratio which results in a dual-maximum DTUER.
文摘以天然碱加工厂为研究对象,主体工艺流程采用“湿式分解—十水碱结晶—一水碱结晶—一水碱干燥—NaHCO3加工”,供能工艺采用“燃煤热电联产+网电”,构建了完整的天然碱加工厂碳排放核算方法。研究结果表明:天然碱加工厂产生的碳排放强度为622.16 kg CO_(2)eq/t,其中直接碳排放强度为473.08 kg CO_(2)eq/t,间接碳排放强度为180.28 kg CO_(2)eq/t;碳汇减少的碳排放强度为31.20 kg CO_(2)eq/t。针对天然碱加工厂碳排放高的情况,提出以下对策:增加天然碱矿石与溶采液接触时间来提高碱卤浓度,减少卤水蒸发量,降低天然碱蒸发结晶工艺对热量的需求,减少燃煤热电联产蒸汽量;选择高效设备和电机,实现电耗源头控制;强化室内试验,优化工艺参数;实施天然碱加工与新能源融合,提高绿电利用率,减少网电间接碳排放;适当提高NaHCO3产能,增加CO_(2)回收利用量。
