Cleaning of flue gas from solid waste incinerator plants by wet/semi-dry process
✍ Scribed by Deuster, E. V. ;Mensing, A. ;Jiang, M. X. ;Majdeski, H.
- Publisher
- American Institute of Chemical Engineers
- Year
- 1994
- Tongue
- English
- Weight
- 585 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0278-4491
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✦ Synopsis
To meet the high demands on the emission limits required by German environmental regulations, well known wet absorption technology using limestone as reagent has been developed and used for specific application in municipal solid waste incineration. This system integrates two independent absorption sections in a single tower, each operating at a different pH. The process ensures the highest removal rate of harmful gases (HCI, SO,, SO3, HF), particulate, and vaporous fumes of heavy metals from the incineration process. The paper discusses the advantages of the wet process. An improvement on this work has been the development of a combined technology incorporating the advantages of spray dryer and wet scrubbing. This combined technology includes a spray dryer, followed by a suitable particulate collection device, and then by the wet scrubbing stage. The purge stream from the wet scrubbing tower is returned as feed to the spray dryer. The by-product from the combination process is a completely dry powder. As a result, the need for waste water treatment for the wet scrubber purge stream is eliminated. In addition, the combination system allows low cost limestone to be used as a sorbent while providing an easy to handle, free flowing solid by-product. This paper describes the details of the system process chemistry, criteria of the gas/liquid mass transfer, and presents the results obtained from pilot plants and commercial plants using these alternative processes.