掺烧新疆煤对W火焰锅炉运行特性影响的探索

Study on the influence of blending Xinjiang coal on the operation characteristics of W flame boiler

摘要

本文以某电厂4×600MW亚临界W火焰锅炉为研究对象，系统分析了掺烧新疆煤对锅炉运行特性的影响。通过现场试验和数据分析，研究了不同掺烧比例下锅炉受热面壁温、减温水流量、蒸汽温度、结焦特性及脱硫系统运行参数的变化规律。结果表明，新疆煤的高水分、高钠钾含量及低灰熔点特性导致锅炉炉膛及高温对流受热面沾污结焦加剧，制粉系统出力下降，脱硫吸收塔氯离子含量显著升高。基于试验数据，提出了15%的安全掺烧比例限值及相应的运行优化措施，为W火焰锅炉安全掺烧新疆煤提供了技术指导。

Abstract

This study investigates the effects of Xinjiang coal blending on a 4×600MW subcritical W-type flame boiler at a power plant. Through field tests and data analysis, we systematically examined variations in boiler wall temperatures, reheating water flow rates, steam temperatures, coking characteristics, and desulfurization system parameters across different blending ratios. Results indicate that Xinjiang coal's high moisture content, elevated sodium-potassium levels, and low ash fusion point intensify fouling in furnace chambers and high-temperature convective surfaces. These factors lead to reduced pulverizer system efficiency and significantly increased chloride ion concentrations in desulfurization absorbers. Based on experimental data, we propose a 15% safe blending limit and corresponding operational optimization measures, providing technical guidance for safe Xinjiang coal blending in W-type flame boilers.

关键词

W火焰锅炉 / 新疆煤掺烧 / 结焦特性 / 运行优化 / 亚临界机组

Key words

W-type flame boiler / Xinjiang coal blending / coking characteristics / operational optimization / subcritical units

参考文献

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