化工进展 ›› 2020, Vol. 39 ›› Issue (3): 1181-1186.DOI: 10.16085/j.issn.1000-6613.2019-1089

• 资源与环境化工 • 上一篇    下一篇

焦炉多余热回收系统的分析及优化

尹珩宇1(),樊俊杰2(),邓加晓2,杜梅芳1,陈时选1   

  1. 1.上海理工大学理学院,上海 200093
    2.上海理工大学环境与建筑学院,上海 200093
  • 收稿日期:2019-07-09 出版日期:2020-03-05 发布日期:2020-04-03
  • 通讯作者: 樊俊杰
  • 作者简介:尹珩宇(1996—),男,硕士研究生,研究方向为余热回收与节能技术。E-mail:yinhengyu123@163.com
  • 基金资助:
    国家重点研发计划(2016YFB0601402)

Analysis and optimization of waste heat recovery system in coke oven

Hengyu YIN1(),Junjie FAN2(),Jiaxiao DENG2,Meifang DU1,Shixuan CHEN1   

  1. 1.School of Science, University of Shanghai for Science and Technology, Shanghai 200093, China
    2.School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2019-07-09 Online:2020-03-05 Published:2020-04-03
  • Contact: Junjie FAN

摘要:

为了研究焦炉多余热回收系统中能量的利用情况,依据分析理论,通过对某焦化厂实际案例的计算,对现有的余热回收方案进行分析,指出3个子系统运行过程中的能量回收的薄弱环节。结果表明:干熄焦、荒煤气、烟气余热回收系统的效率分别为55.16%、17.18%、51.75%,干熄焦系统的损主要为换热过程中产生的不可逆换热损失,荒煤气系统的损主要为出口损以及不可逆换热损失,烟道系统的损主要为烟气出口损。在此基础上依据各等级能量匹配利用的原则对原方案进行优化,并使用分析理论对其计算并分析。结果表明:优化过后的余热回收系统的总效率为58.72%,相比优化之前提高了11.07%,系统总不可逆换热损降低了155.49MJ/t干煤。

关键词: 焦炉, 余热回收, 分析, 优化

Abstract:

In order to study energy utilization efficiency in the process of coke oven multi-heat recovery, three subsystems of waste heat recovery in coke plant were analyzed based on the analysis theory, and the weak links of energy utilization in the process of waste heat recovery were pointed out. The results showed that the exergy efficiency of the three studied systems as coke dry quenching, raw coke oven gas and flue gas were 55.16%, 17.18% and 51.75%, respectively. The main exergy loss of coke dry quenching system is irreversible heat transfer loss in the process of heat transfer. Exergy loss of raw coke oven gas system is mainly outlet exergy loss and irreversible heat transfer loss and the main exergy loss of flue gas system is outlet exergy loss. On this basis, the original plan was optimized according to the principle of energy matching and utilization of different grades, and exergy analysis theory was used to calculate and analyze it. The results showed that the total exergy efficiency of the waste heat recovery system after optimization was 58.72%, which was 11.07% higher than that before optimization, while overall irreversible replacement loss of exergy of the system decreased by 155.49MJ/t dry coal.

Key words: coke oven, waste heat recovery, exergy analysis, optimization

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