热工设备表面散热检测计算方法探究.docVIP

武汉理工大学论文（设计） - PAGE 51 - 摘要 能源是制约经济发展的颈瓶，随着经济的发展，能源危机越发显得突出和重要。因此，提高能源的利用效率，在生产中切实做好节能降耗工作对缓解能源危机，保障国民经济持续、稳定、健康发展具有重要的意义。 水泥生产是国民经济中的一个耗能大户，以新型水泥预分解生产工艺为例，每生产1吨水泥约消耗0.1到0.12吨标准煤，其能耗占到水泥生产成本的40%～60%，其中窑体表面散热损失又占熟料实际热耗的20%左右。为了实时监控窑体表面温度，尽可能减少表面散热，就必须解决好热工设备表面散热的测量与计算问题。现有的计算中所用到的表面综合换热系数的计算范围，其温度范围上限仅为240℃，已严重不能满足新型干法水泥窑表面散热计算的需要。为此，本论文对现有的计算温度区间的相关参数及理论进行了重新的分析研究，得到了计算综合换热系数的回归方程，并应用于对实际范例的计算，结果表明，所得到的方程较好地解决了不同情况下表面综合换热系数的计算问题。我们得到的回归方程如下： 转动设备表面散热综合换热系数方程： 当风速W=0时： α=0.246△t + 35.34 当风速W≠0时： 在温差△t≤时： α=（0.0027w + 0.265）△t + 4.76w2 + 18.57w + 35.36 在温差△t＞时： α=（-0.1774w5+1.0957w4–2.5536w3+2.7461w2–1.3201w+0.2743）△t –0.88w2 + 22.14w + 76.90 不动设备表面散热综合换热系数系数方程： 当风速W=0时： α=0.251△t + 25.07 当W≠0时： α=（0.0009w3 - 0.0149w2 + 0.0808w +0.176）△t - 0.305w2 + 11.793w+ 41.64 关键词： 能源危机 综合换热系数 回归方程 节能 Abstract Energy is restriction economic development , along with the development of economy, energy crisis the more looks outstanding and important. Therefore raise energy, use efficiency, in production, make energy saving conscientiously to fall, consume , work is ensured for alleviating energy crisis, have continued national economy , stabilize , healthy development have important meaning. Cement production is that one in national economy consumes can big household, decompose in advance with new cement to produce technology, for example. Per produce 1 tons of cement contract consumption 0.1 to 0.12 ton standard coals, Its specific power consumption takes the of cement production cost 40% ～ 60%, again take the 20% of cooked material actual hear rate in which kiln body surface heat loss due to radiation control. For the monitoring kiln body surface temperature of real time, reduce surface scattered heat as far as possible, must solve the hot measure and calculation of work equipment surface scattered heat problem. The calculation of the surface comprehensive coefficient of heat exchange that uses in existing calculation sco