ORC直接接触式蒸发器传热性能研究
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摘要
为分析低温余热发电ORC直接接触式蒸发器内分散相在连续相中的传热性能,分别选用新型环保有机工质R245fa和THERMINOL66导热油作为分散相和连续相,进行ORC直接接触式蒸发器传热性能的研究,分析了初始传热温差、工质体积流量和导热油质量流量对ORC直接接触式蒸发器容积传热系数的影响.结果表明:容积传热系数随着传热时间的增加先呈增大趋势,然后逐渐减小并趋于平稳,但大于传热开始阶段的容积传热系数;在工质体积流量和初始传热温差为定值的情况下,为获得较大的容积传热系数,导热油质量流量应控制在较小的范围内.
To analyze the heat-transfer performance of dispersed phase in continuous phase within ORC direct contact evaporator for low-temperature waste-heat power generation,the environmental-friendly refrigerant R245fa and heat-transfer oil THERMINOL66were respectively taken as the dispersed phase and continuous phase,with which the influence of following factors on the volumetric heat-transfer coefficient of ORC direct contact evaporator was analyzed,such as the initial temperature difference,the refrigerant flow rate and the oil flow rate,etc.Results show that the volumetric heat-transfer coefficient rises first,drops later on,and finally tends to be stable,always being larger than the coefficient at initial period;for a fixed refrigerant flow rate and initial temperature difference,the flow rate of heat-transfer oil should be controlled within a narrow range so as to obtain higher volumetric heat-transfer coefficient of ORC direct contact evaporators.
To analyze the heat-transfer performance of dispersed phase in continuous phase within ORC direct contact evaporator for low-temperature waste-heat power generation,the environmental-friendly refrigerant R245fa and heat-transfer oil THERMINOL66were respectively taken as the dispersed phase and continuous phase,with which the influence of following factors on the volumetric heat-transfer coefficient of ORC direct contact evaporator was analyzed,such as the initial temperature difference,the refrigerant flow rate and the oil flow rate,etc.Results show that the volumetric heat-transfer coefficient rises first,drops later on,and finally tends to be stable,always being larger than the coefficient at initial period;for a fixed refrigerant flow rate and initial temperature difference,the flow rate of heat-transfer oil should be controlled within a narrow range so as to obtain higher volumetric heat-transfer coefficient of ORC direct contact evaporators.
引文
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[14]THONGWIK S,VORAYOS N,KIATSIRIROAT T,et al.Thermal analysis of slurry ice production system using direct contact heat transfer of carbon dioxide and water mixture[J].International Communications in Heat and Mass Transfer,2008,35(6):756-761.
[2]王辉涛,王华.低温太阳能热力发电有机朗肯循环工质的选择[J].动力工程,2009,29(3):287-291.WANG Huitao,WANG Hua.Selection of working fluids for low-temperature solar thermal power generation organic Rankine cycles[J].Journal of Power Engineering,2009,29(3):287-291.
[3]NOMURA T,TSUBOTA M,OYA T,et al.Heat storage in direct-contact heat exchanger with phase change material[J].Applied Thermal Engineering,2013,50(1):26-34.
[4]LEMENAND T,DURANDAL C,DELLA VALLE D,et al.Turbulent direct-contact heat transfer between two immiscible fluids[J].International Journal of Thermal Sciences,2010,49(10):1886-1898.
[5]SEETHARAMU K N,BATTYA P.Direct contact evaporation between two immiscible liquids in spray column[J].Journal of Heat Transfer,1989,111(27):780-785.
[6]TRADIST L,DISO I S,SANTINI R,et al.Vaporization of a liquid by direct contact in another immiscible liquid,Part I:vaporization of single droplet,Part II:vaporization of rising multidroplets[J].International Journal of Heat and Mass Transfer,1987,30(9):1773-1785.
[7]SIDEMAN S,GAT Y.Direct contact heat transfer with change of phase:spray-column studies of a threephase heat exchanger[J].American Institute of Chemical Engineers Journal,1996,12(2):296-303.
[8]SIQUEIROS J,BONILLA O.An experimental study of a three-phase,direct-contact heat exchanger[J].Applied Thermal Engineering,1999,19(5):477-493.
[9]JACOBS H R.Thermal and hydraulic design of direct contact spray columns for use in extracting geothermal brines[J].Hemisphere,1988,11(52):343-369.
[10]CELATA G P,CUMO M,D'ANNIBALE F.Direct contact evaporation of nearly saturated R114in water[J].International Journal of Heat and Mass Transfer,1995,38(8):1495-1504.
[11]张鹏,王一平,郭翠梨,等.汽-液-液三相垂直管内充分发展流传热性能[J].化工学报,2001,52(2):125-128.ZHANG Peng,WANG Yiping,GUO Cuili,et al.Drect contact heat transfer between two immiscible liquids in vertical tube[J].Journal of Chemical Industry and Engineering(China),2001,52(2):125-128.
[12]章学来,李瑞阳,郁鸿凌,等.添加剂及其对直接接触式相变传热的影响[J].化工学报,2002,53(8):837-841.ZHANG Xuelai,LI Ruiyang,YU Hongling,et al.Additives and their effects on direct contact phase change heat transfer[J].Journal of Chemical Industry and Engineering(China),2002,53(8):837-841.
[13]崔现宝,郭永欣,胡朋飞,等.湿式干釜直接接触传热蒸发过程[J].化工学报,2007,58(7):1655-1662.CUI Xianbao,GUO Yongxin,HU Pengfei,et al.Process of direct-contact evaporation in wet-type dry still[J].Journal of Chemical Industry and Engineering(China),2007,58(7):1655-1662.
[14]THONGWIK S,VORAYOS N,KIATSIRIROAT T,et al.Thermal analysis of slurry ice production system using direct contact heat transfer of carbon dioxide and water mixture[J].International Communications in Heat and Mass Transfer,2008,35(6):756-761.
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