从工业企业的实际需求出发，根据热力学基本原理，运用现代传感器技术、自动测量与控制技术和高效的热交换技术，研发出一套综合高效的工业企业低温烟气废热回收和梯级利用系统，用于企业实际生产中. 该系统采用模块化设计，更好地适应了工业生产工况的不断变化，解决了工业中常见的低温(低于250℃)废热回收利用率不高的问题，实现了废热回收量和使用量的全自动动态调节，克服了同类系统用途单一、回收利用率低、自动化程度低、操作复杂且精度差等缺陷. 该系统不仅为该企业节约30万元/年以上的能源支出，还减少了废热自然排放造成的能源浪费与热污染，具有显著的社会和经济效益.

To satisfy the actual demands of industrial enterprises, a comprehensive and high-efficient system based on the principle of thermodynamics, and applicable to recovery and cascade utilization of waste heat for low-grade flue gas in industrial field, has been researched and developed within modern sensor technology, automatic measurement and control technology, and high-efficient heat exchange technology. It has been applied practical production in the industrial enterprise. Modular design has been adopted, which can better adapt to the highly-variable working conditions during the productive process and then achieve automatic dynamic control for the amount of recovery and utilization of waste heat. It has gotten rid of the low efficiency of recovery and utilization for low-grade waste heat below 250℃ in the industrial enterprises. Moreover, it overcame the defects of analogous system, such as narrow range of application, low efficiency of recovery and utilization, poor level of automation, and complexity and poor precision for operation. The practical application in the industrial enterprise has demonstrated that the system can only save the energy cost beyond 300000 ￥/a, but also decrease energy waste and thermal pollution caused by direct emission of waste heat. Therefore benefit society and economy were significantly.