高碱煤燃烧过程中灰中主要元素的迁移规律

Translated title of the contribution: Transition behavior of main elements in fly ash during high alkali coal combustion

Baiqian Dai, Xiaojiang Wu, Zhongxiao Zhang

Research output: Contribution to journalArticleResearchpeer-review

16 Citations (Scopus)

Abstract

To study the fouling and slagging properties of fly ash from combustion of Xinjiang high alkali coal, XRF and SEM-EDX analysis were carried out to ash samples taken from various heating surfaces in a 300 MW subcritical boiler burning high alkali coal. Results show that in the gas temperature range of 800-1100°C, mass fractions of CaO, MgO and SO3 in ash samples are relatively high; whereas for in temperature range of 600-800°C, mass fractions of Na2O, Fe2O3 and SO3 are relatively high, in which case serious fouling on high-temperature convection heating surfaces is caused by Na2SO4, CaSO4 and NaFeSO4 during combustion of high alkali coal. For locations where the gas temperature is in the range of 669-915°C, both the initial melting temperature of ash samples and corresponding liquid slag ratio are higher than those in other places. Na2SO4 particles with sizes of 2-4 μm rich in Na and S are found to stick on surface of ash sample C, which at high temperatures have high sticky properties and low melting temperatures, and therefore may lead to serious fouling problems.

Translated title of the contributionTransition behavior of main elements in fly ash during high alkali coal combustion
Original languageChinese
Pages (from-to)438-442
Number of pages5
JournalDongli Gongcheng Xuebaoring
Volume34
Issue number6
Publication statusPublished - 2014
Externally publishedYes

Keywords

  • Alkali metal
  • Ash fusion characteristic
  • Fouling property
  • High alkali coal

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