烟气余热直烘脱脂冷轧板可行性分析

Feasibility Analysis of Direct Drying Degreasing Cold Rolled Sheet with Flue Gas Waste Heat

摘要: 为了充分利用好余热资源，响应“节能减排”的号召，结合改造某企业轧钢项目实例，针对退火炉的高温烟气进行余热利用，研究新技术、新工艺。本文通过设计工艺流程及烟气净化系统，对热效率进行分析，提出余热利用冷轧板烟气烘干技术，并对其经济性与节能性进行分析，阐述开发利用布袋除尘器净化后的烟气对冷轧板直接进行烘干处理技术的过程。研究表明，净化烟气烘干冷轧板技术开发可行，余热利用效率较传统工艺44%~52%的热效率大大提高，可达61.16%，而且还节省了烘干单独使用时的8800 t/年蒸汽量以及两台75 kW的风机用电，节能减排效果好，能明显带来较高的经济效益。

Abstract: In order to make full use of the waste heat resources and respond to the call for “energy saving and emission reduction”, combined with the example of the transformation of a steel rolling project in a certain enterprise, the waste heat utilization of the high temperature flue gas of the annealing fur-nace is carried out, and new technologies and processes are researched. This paper analyzes the thermal efficiency by designing the technological process and the flue gas purification system, and proposes the waste heat utilization of cold-rolled sheet flue gas drying technology, and analyzes its economy and energy saving. It’s described the process of drying a cold rolled sheet directly with the flue gas purified by bag filter. The research shows that the technology development of purifying flue gas drying cold-rolled sheet is feasible, and the waste heat utilization efficiency is greatly improved compared with the traditional process of 44%~52% thermal efficiency, which can reach 61.16%, and it also saves 8800 t/year of steam when drying is used alone. The power consumption of two 75 kW fans is good, and the energy saving and emission reduction effect is good, which can obviously bring high economic benefits.