Modelling alkali salt deposition on kraft recovery boiler heat exchangers in the superheater section

被引：0

作者：

Eskola, AJ ^{[1
]}

Jokiniemi, JK ^{[1
]}

Vakkilainen, E ^{[1
]}

Lehtinen, KEJ ^{[1
]}

机构：

[1] VTT Energy, Aerosol Technol Grp, FIN-02044 Espoo, Finland

来源：

INTERNATIONAL CHEMICAL RECOVERY CONFERENCE, VOLS 1-3 | 1998年

关键词：

D O I：

暂无

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The aim of this paper is to describe the improved fume chemistry and deposition models that have been implemented into the previously developed computer model ABC. With the improved model, we are able to clearly identity the importance of different deposition mechanisms for vapours as well as for particles of different sizes. In the improved model Raoult's law is used to approximate vapour pressures of condensing species on the surface of molten salt particles. Based on the sample calculation made for an Asian kraft recovery boiler, significant vapour deposition seems to occur only if the superheater inlet gas temperature exceeds 800 degrees C. On the other hand, deposition of carryover particles on superheater section seem to cause major part of the deposited mass. This is the case with cross flow at the entrance of superheater platens as well as with flow parallel to superheater platens. Sample calculation also indicates that increased chlorine content in the deposit layers of colder superheater platens seems to be a consequence of fume particle deposition.

引用

页码：469 / 486

页数：18