The waste fiuorgypsum was modified and applied as a cement retarder. The main chemical composition and mineral structure of the waste fluorgypsum were analyzed. Scanning electron microscopy （SEM） and eight-channel m...The waste fiuorgypsum was modified and applied as a cement retarder. The main chemical composition and mineral structure of the waste fluorgypsum were analyzed. Scanning electron microscopy （SEM） and eight-channel micro-calorimeter （TAM Air） were employed to analyze the changes in morphology and study the application performance of the modified fluorgypsum, respectively. Experimental results indicate that the flexural strength and compressive strength of the modified fiuorgypsurn are roughly equal to those of the natural gypsum. The morphology of the crystal of the fiuorgypsum changes from block particle into trimetric short column. The fluorgypsum crystals stagger mutually and improve the strength of the hardened body. The modified fluorgypsum as cement retarder could delay the hydration, reduce the heat of the hydration and make the setting time, volume stability, and the S03 content of the cement meet the national standards. The modified fluorgypsum is a good substitute for the natural gypsum.展开更多
In common,the waste heat of the flue gas is recovered and utilized to heat the low temperature feedwater by installing the low temperature economizer(LTE),which can save the steam extracted from the steam turbine and ...In common,the waste heat of the flue gas is recovered and utilized to heat the low temperature feedwater by installing the low temperature economizer(LTE),which can save the steam extracted from the steam turbine and then increase the unit output.However,restricted by the low temperature of waste flue gas,the energy-saving efect is inconspicuous.Based on the common waste heat utilization system of the flue gas.展开更多
基于现有燃气热水锅炉排烟中占燃料输入低位热值约10%的潜热和显热并未被有效利用,搭建了燃气锅炉烟气余热回收实验平台,分析了电压缩式热泵回收烟气冷凝热对锅炉系统效率以及经济性的影响,并提出了气电耦合系统运行优化策略。结果表明...基于现有燃气热水锅炉排烟中占燃料输入低位热值约10%的潜热和显热并未被有效利用,搭建了燃气锅炉烟气余热回收实验平台,分析了电压缩式热泵回收烟气冷凝热对锅炉系统效率以及经济性的影响,并提出了气电耦合系统运行优化策略。结果表明:锅炉回水温度和热负荷越高,锅炉本体的排烟温度越高,热效率越低;随着锅炉本体热负荷和回水温度的升高,耦合热泵后的锅炉系统热效率提升幅度越大,提升幅度为4.4百分点~10.4百分点;增加锅炉负荷、降低回水温度有利于提高热泵性能系数(coefficient of performance, COP),热泵系统的投资回收期可缩短至3 a以内;由于热泵的最优实时功率随着电价的增加不断向低功耗高效率的方向移动,应根据锅炉负荷和气电价比实时调整热泵出力。展开更多
基金Project(21003014) supported by the National Natural Science Foundation of ChinaProject(2010FJ3167) supported by the Hunan Provincial Science and Technology Program,ChinaProject(K1104029-11) supported by the Changsha IT Project
文摘The waste fiuorgypsum was modified and applied as a cement retarder. The main chemical composition and mineral structure of the waste fluorgypsum were analyzed. Scanning electron microscopy （SEM） and eight-channel micro-calorimeter （TAM Air） were employed to analyze the changes in morphology and study the application performance of the modified fluorgypsum, respectively. Experimental results indicate that the flexural strength and compressive strength of the modified fiuorgypsurn are roughly equal to those of the natural gypsum. The morphology of the crystal of the fiuorgypsum changes from block particle into trimetric short column. The fluorgypsum crystals stagger mutually and improve the strength of the hardened body. The modified fluorgypsum as cement retarder could delay the hydration, reduce the heat of the hydration and make the setting time, volume stability, and the S03 content of the cement meet the national standards. The modified fluorgypsum is a good substitute for the natural gypsum.
文摘In common,the waste heat of the flue gas is recovered and utilized to heat the low temperature feedwater by installing the low temperature economizer(LTE),which can save the steam extracted from the steam turbine and then increase the unit output.However,restricted by the low temperature of waste flue gas,the energy-saving efect is inconspicuous.Based on the common waste heat utilization system of the flue gas.
文摘基于现有燃气热水锅炉排烟中占燃料输入低位热值约10%的潜热和显热并未被有效利用,搭建了燃气锅炉烟气余热回收实验平台,分析了电压缩式热泵回收烟气冷凝热对锅炉系统效率以及经济性的影响,并提出了气电耦合系统运行优化策略。结果表明:锅炉回水温度和热负荷越高,锅炉本体的排烟温度越高,热效率越低;随着锅炉本体热负荷和回水温度的升高,耦合热泵后的锅炉系统热效率提升幅度越大,提升幅度为4.4百分点~10.4百分点;增加锅炉负荷、降低回水温度有利于提高热泵性能系数(coefficient of performance, COP),热泵系统的投资回收期可缩短至3 a以内;由于热泵的最优实时功率随着电价的增加不断向低功耗高效率的方向移动,应根据锅炉负荷和气电价比实时调整热泵出力。
