针对木材干燥过程能耗高的特点,设计了一种基于自回热(self-heat recuperation,SHR)原理的木材干燥系统.通过能量分析方法对传统热风干燥过程与SHR干燥过程的耗能情况进行对比分析,同时研究了空气流量、压缩机绝热效率、传热温差对自回热干燥系统性能的影响.结果表明:在相同干燥条件下,SHR干燥系统总耗能比传统干燥过程减少了80.1％,能量回收率为75.4％,而传统干燥过程的能量回收率仅为30.3％.对于SHR干燥系统,在干燥速率不变时,系统总能耗随着空气流量增大而升高,随着压缩机绝热效率增大而降低,最佳绝热效率为0.6 ～0.8.随着传热温差增大,系统总能耗增加,传热面积减小,最佳传热温差约为10℃.%Aiming at the high energy consumption in the wood drying process,a new wood drying process based on self-heat recuperation (SHR) is developed and designed.The energy consumption status of conventional hot air drying and SHR drying process is compared and analyzed by means of energy analysis,and the effects of airflow rate,adiabatic efficiency of compressor and temperature difference of heat transmission on the performances of SHR drying system are studied.The results show that under the same drying conditions,the total energy consumption of SHR process is reduced by 80.1％ compared with conventional drying process,and the energy recovery rate of SHR process is 75.4％ while that of conventional drying process is only 30.3％.For SHR drying system,the total energy consumption enhances along with the increase of airflow rate and reduces along with the increase of adiabatic efficiency of compressor in constant drying rate,and the optimum adiabatic efficiency is obtained as 0.6-0.8.With the increase of temperature difference of heat transmission,the total energy consumption enhances and the heat transfer area reduces,so the optimum temperature difference is regarded as about 10 ℃.
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