成材窑干热平衡和能源利用分析

<正>对消耗热量较大的设备或过程进行热平衡测试可以使人们了解共能耗的分配,从而寻求节约能源的途径。本文对两种方式成材窑干的热平衡测试进行了系统的讨论,提出了可比热效率的计算方法。文章以在—上海人造板厂的测试为基础,从能源利用的角度分析了现行工艺和设备的合理性。测试和计算显示,成材窑干具有很大的节能潜力。除应完善供汽一供热系统之外,这些潜力还表观在;尽量限制或用其他方法代替喷蒸的使用,加强对排气的控制等。为了满足这些节能工艺,窑体的气密性显得特别重要。从经济角度考虑,即使为此成倍地增加建窑投资也将是划得来的。

HEAT BALANCE IN KILN DRYING OF LUMBER AND ITS ENERGY CONSUMPTION

For the equipment or processing which consumes a greater amount of heat, heat balance determination should be made to get better understanding of the distribution of energy consumption so that ways of saving energy can be explored. This article gives a systematic account of how heat balance determinations are made in two types of lumber drying, and suggests a calculation method for comparing heat efficiency in different kinds of kiln drying. Based on the data collected at the Shanghai Fiberboard Factory, the article discusses the rationality of the present technology and equipment of kiln drying from the angle of its utilization ratio of energy. The data concerning the results of determinations and calculations from this factory show that for the present lumber kiln drying there is great potentiality in saving energy. In addition to the improvement of the steam and heat supply system of the kiln, the author suggests that the use of steaming should be restricted or even replaced by some other means, and also that effective methods to control the exhaust-gas from kilns should be introduced. In order to ensure the effectiveness of the technology mentioned above, it is imperative to make sure of the air-tightness of the kiln. For the sake of energy saving, it would be worthwhile to increase the investment in building a new kiln.