废气再循环式柴油热风炉热交换系统的研制

The development of heat exchange system for a diesel-hot-air stove of exhaust gas recirculation in greenhouses

介绍一种利用废气再循环以提高柴油热风炉热效率的方法,及其自行研制一种适用于温室内的全数字微机智能监控柴油热风炉废气再循环热交换系统。它由微电脑控制间歇地分流大部分、乃至全部已燃废气到进气管的装置。该系统采用新型的数字式温、湿度一体化传感器(LTM8901)和一线总线结构,由微处理器(89C51)自动智能监控。从系统的原理、结构设计出发,开发了独特用于柴油热风炉的废气再循环热交换系统,找到了最佳工作状况。当控制EGR率在50%～70%范围时,能提高热利用率17.6%,节约能源,并且还降低了排放污染。

A strategy for auto-controlling unique exhaust gas recirculation(EGR) heat-exchange set in the heating system froma Diesel-hot-air stove for the field polyethylene film greenhouses was proposed. The system consists of a new type of digitaltemperature - humidity transmitters and a 'one line for all 'structure and intelligently controls the operation of the control objects.NOX emission was decreased by EGR heat-exchange set and a heat-exchange set of EGR system, which could give the optimizingEGR characteristics needed by Diesel-hot-air stove test was developed. The structure and constitution of these EGR heat-ex-change set were also introduced. This strategy as well as its validity was proved by the Diesel-hot-air stove tests. The range of theEGR rate all the way from 50% to 70%, the heat utilization efficiency of the heat-exchange heating system was enhanced by17.6 %. It reduced the pollution of the environments yet.