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两级压缩高温热泵干燥木材的研究
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摘要
通过对两级压缩高温热泵干燥木材的理论和实验研究,提出了带中间换热器的两级压缩热泵干燥循环系统,并进行了热力学理论分析和比较,证实明两级压缩热泵的节能特性。
     通过对木材干燥窑内空气循环的理论分析,首次推导出空气旁通率理论计算方法并首次提出了露点温差理论。
     首次建立了热泵干燥系统与木材干燥窑内空气状态及旁通率的数学模型。分析了除湿干燥热泵系统各个参数与窑内状态和空气旁通率i_b之间的关系。干燥热泵的制冷量、制冷剂流量、压缩机功率以及中间换热器的换热量都与系统的空气旁通率成线性关系。
     首次提出了木材两级压缩甚至更多级压缩高温热泵设计的一般方法,即根据木材干燥工艺要求按单级压缩条件设计计算,再在高温干燥条件下,按高压级校核的两级压缩热泵的干燥设计计算方法,具有一定的指导意义。
     建立了两级压缩高温热泵木材干燥实验台,通过马尾松干燥实验,研究了单级压缩、单双级压缩、双级压缩干燥木材的各类参数的变化规律及空气旁通率的影响,对热泵干燥的理论分析进行了一定的验证。单级压缩总能耗比双级压缩高了23.05%,单级压缩干燥木材整个过程的平均能量回收率为25.55%,双级压缩干燥木材的整个过程的平均能量回收率为33.63%。能量回收率与出水量之间成正比关系,即出水量越大,能量回收率越高。
The cycles system of heat pump drying with intermediate heat-exchanger and two-level compression was developed as well as the theoretical analysis of thermodynamics and comparison were conducted. The less energy consumption of heat pump with two-level compression was proved.
     The theoretical calculation method of bypass ratio was induced and the theory of dew point temperature depression was raised firstly.
     The mathematical models for heat pump drying system, air-conditions in the lumber drying kiln and bypass ratio were formed firstly. The relationships between parameters of heat pump system, kiln conditions and bypass of air were analyzed. Based on requirements of lumber drying process, design methods for high-temperature heat pump with two-level even multi-level compression were developed firstly.
     Experiment stage for high-temperature heat pump drying of lumber was established and the variation patterns of different kinds of parameters for lumber drying with single-level, single-two-level and two-level compression as well as the effects of air bypass were investigated by drying experiments of Masson's pine lumber. The theoretical analysis for heat pump drying was verified. Total energy consumption of single-level compression is higher than that of two-level compression by 23.05%. Energy recycling rate of lumber drying process with single-level compression is 25.55% and that two-level compression is 33.63%. Energy recycling rate is in direct proportion with dewatering capacity, that is, the larger the dewatering capacity is, the higher the energy recycling rate is.
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