基于夹点技术考虑碳排放的胶合板生产换热网络优化

2025-06-13李奇澳罗武生江枫文韬喻胜飞

森林工程 2025年3期

关键词：夹点技术；胶合板；换热网络优化；碳排放；能源中图分类号：（204号文献标识码：A DOI： 10.7525/j.issn.1006-8023.2025.03.011

Abstract： The productionof plywood consumes alarge amount of energy.Inorder to improve economic eficiency，support carbon peak and carbon neutrality goals，it is necessary to improve energy eficiencyand reduce energy consumption.This articletook 5heat exchange logistics intheproduction processof plywoodas theresearch object，used pinch point technology to analyze the heat exchange network under existing production conditions，and proposed optimization and improvement plans.Aspen Plus was applied to establish a heat exchange network in the plywood production process，calculate the stream flowrateand physical propertydataof each side line，dividethe temperaturerange，determinethe minimum heat transfer temperature diffrence，and calculate the pinch pointtemperature.The traditional pinch point method determined the minimum heat transfer temperature difference to be 9 ． After considering carbon emissions，the minimum heat transfer temperature difference was adjusted to 7 ，and the average pinch point temperature was 1 1 6 . 5 C . The pinch point temperature was used to analyze and diagnose the phenomenon of crossing pinch points in the heat exchange network，accuratelylocated the botleneck position of the heat exchange network，adjusted theimproperlyconfiguredcoldandhotstream heat exchangers，andachievedthegoalofoptimizing the entire heat exchange network.Afteroptimization，the usage of cold and hotutilities inthe system decreased by 862 465.0kWand 202 642.O kW respectively，significantly reducing the energy consumption of the equipment.

Keywords：Pinch point technology；plywood；optimization of heat exchange network；carbon emissons；energy

0 引言

胶合板生产消耗大量能源。目前，胶合板生产工艺包括预压、热压和干燥等工序，其热压周期长、生产效率低、能耗大。为响应国家实施的\"双碳”目标，推动碳达峰”与“碳中和”目标的实现，不仅要致力于能源结构的转型，还需对现有装置实施能源节约的改进措施。许多学者对胶合板节能技术进行了研究，并引入了大量设备来提高能源效率、降低能耗。何志兴等[1]提出了锅炉烟气余热利用方案，将蒸汽锅炉的烟气引入干燥窑对木材进行干燥，每年通过回收利用的锅炉烟气余热折合标煤达胡滨铠等²研发了一种蒸汽回收系统，该系统能够回收单板干燥中所产生的大量二次蒸汽，并将其用作锅炉的补给水进行循环利用。这一创新举措预计可以节约大约 3 0 % 的燃料消耗、水资源以及水处理成本。 G a o 等[3]综述了目前木材干燥工艺和最先进的热泵木材干燥技术，包括热泵循环选择、能量回收、制冷剂选择和可再生能源集成等，提高木材干燥系统的效率。由于工艺限制，这些方法集中于对单个过程的节能研究，专注于锅炉节能改造、烟气余热利用改造以及循环水回收利用改造，没有考虑换热网络系统研究方法。