Abstract: The heating furnace of the 1.20 MMTPY delayed coking unit of PetroChina Dushanzi Petrochemical Co., Ltd. undergoes mechanical decoking once a year. During the decoking period, the blower and induced draft fan need to be stopped, causing the VOCs (volatile organic compounds) generated by the odor control system and odor treatment facilities to be directly discharged into the atmosphere, which will cause environmental pollution. A temporary mobile odor control system is required, with a cost of about 300,000 yuan. Based on the considerations of environmental protection and quality improvement, a feasibility analysis of the mechanical decoking process scheme without stopping the blower and induced draft fan was carried out, and the industrial application was conducted. The results show that: by using non-stop blowers and induced draft fans for mechanical decoking, the tube wall temperature of the heating furnace can meet the requirement of not exceeding 100℃; the maximum concentration of NOx in the flue gas of the heating furnace is 78 mg/m³, which meets the environmental protection requirement of not more than 100 mg/m³; the volume fraction of combustible gas at the entrance of the operating furnace chamber is 0.022%, which meets the safety production requirements; the economic benefit of the unit increased by 2.479 million yuan in half a year.

Key words: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">delayed coking, heating furnace, keep the fan running, mechanical decoking, odor control, combustible gas, VOCs, NOx

摘要： 中国石油独山子石化分公司1.20Mt/a延迟焦化装置加热炉每年进行一次机械清焦。清焦期间需停用鼓风机和引风机，造成装置除臭系统和异味治理设施产生的VOCs（挥发性有机物）只能直排大气，会对环境造成污染，需增加临时移动除臭系统，费用约30万元。基于环境保护和提质增效两方面考虑，对不停止鼓风机和引风机机械清焦工艺方案进行了可行性分析并工业应用。结果表明：采用不停止使用鼓风机和引风机机械清焦，加热炉炉管管壁温度可以满足不高于100℃的要求；加热炉烟气NOx质量浓度最高78mg/m³，满足不大于100mg/m³的环保要求；运行炉室入口可燃气体体积分数为0.022%，满足安全生产要求；装置经济效益半年增加247.9万元。

关键词: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">延迟焦化, 加热炉, 不停风机, 机械清焦, 除臭, 可燃气体, VOCs, NOx