针对板翅式换热器正交接管封头的强度设计问题,给出了基于比率塑性功曲率(Ratio plas-tic work curvature,RPWC)准则塑性压力计算方法,并利用弹性应力分析设计准则对封头在许用压力作用下的强度校核。对某工业封头的塑性压力及其许用压...针对板翅式换热器正交接管封头的强度设计问题,给出了基于比率塑性功曲率(Ratio plas-tic work curvature,RPWC)准则塑性压力计算方法,并利用弹性应力分析设计准则对封头在许用压力作用下的强度校核。对某工业封头的塑性压力及其许用压力算例分析表明,比率塑性功曲率峰值确定RPWC准则塑性压力具有唯一性,克服了两倍弹性斜率准则需凭经验选择变形参数的缺点;许用压力作用下的封头强度满足弹性应力分析设计准则。基于RPWC准则的方法是板翅式换热器正交接管封头塑性压力计算的有效方法。展开更多
Heat exchangers play an important role in supercritical water coal gasification systems for heating feed and cooling products. However, serious deposition and plugging problems always exist in heat exchangers. CFD mod...Heat exchangers play an important role in supercritical water coal gasification systems for heating feed and cooling products. However, serious deposition and plugging problems always exist in heat exchangers. CFD modeling was used to simulate the transport characteristics of solid particles in supercdtical water through the shell and tube of heat exchangers to alleviate the problems. In this paper, we discuss seven types of exchangers CA, B, C D, E, F and G）, which vary in inlet nozzle configuration, header height, inlet pipe diameter and tube pass distribution. In the modeling, the possibility of deposition in the header was evaluated by accumulated mass of particles; we used the velocity contour of supercritical water （SCW） to evaluate the uniformity of the velocity dis- tribution among the tube passes. Simulation results indicated that the optimum heat exchanger had structure F, which had a rectangular configuration of tube pass distractions, a bottom inlet, a 200-mm header height and a 10-ram inlet pipe diameter.展开更多
文摘针对板翅式换热器正交接管封头的强度设计问题,给出了基于比率塑性功曲率(Ratio plas-tic work curvature,RPWC)准则塑性压力计算方法,并利用弹性应力分析设计准则对封头在许用压力作用下的强度校核。对某工业封头的塑性压力及其许用压力算例分析表明,比率塑性功曲率峰值确定RPWC准则塑性压力具有唯一性,克服了两倍弹性斜率准则需凭经验选择变形参数的缺点;许用压力作用下的封头强度满足弹性应力分析设计准则。基于RPWC准则的方法是板翅式换热器正交接管封头塑性压力计算的有效方法。
基金Supported by the National Basic Research Program of China(2014CB745100)the National Natural Science Foundation of China(21576197)+1 种基金Tianjin Research Program of Application Foundation and Advanced Technology(14JCQNJC06700)Tianjin Penglai 19-3 Oil Spill Accident Compensation Project(19-3 BC2014-03)
文摘Heat exchangers play an important role in supercritical water coal gasification systems for heating feed and cooling products. However, serious deposition and plugging problems always exist in heat exchangers. CFD modeling was used to simulate the transport characteristics of solid particles in supercdtical water through the shell and tube of heat exchangers to alleviate the problems. In this paper, we discuss seven types of exchangers CA, B, C D, E, F and G）, which vary in inlet nozzle configuration, header height, inlet pipe diameter and tube pass distribution. In the modeling, the possibility of deposition in the header was evaluated by accumulated mass of particles; we used the velocity contour of supercritical water （SCW） to evaluate the uniformity of the velocity dis- tribution among the tube passes. Simulation results indicated that the optimum heat exchanger had structure F, which had a rectangular configuration of tube pass distractions, a bottom inlet, a 200-mm header height and a 10-ram inlet pipe diameter.
