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

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