中国有色冶金

The waste heat boiler in smelting plant can not only recover waste heat but also collect dust in hot offgas, recover valuable metals and reduce dust content in offgas, however, if there is severe coking in the operation, it will shorten the maintenance interval and affect the production. A certain company used to remove the coking by worker entering the manhole, resulting the issues of large labor intensity and inconspicuous decoking effect. Based on the above, the company took the measures of updating the structure of the radiation zone of boiler, improving the form and moisture content of inlet material, adding coking depressant, using boiler spray technology, etc. to control boiler coking, and obvious results were achieved. The boiler maintenance interval is increased from 30 days to 40 days, the amount of cleared coking is reduced from 20~25t to approximately 10t, and the clearing time is reduced from 48h/month to 6~7h/month. The successful transformation of the boiler system can provide a reference to the similar plants.