1 000 MW超超临界双切圆燃烧锅炉结焦与高温腐蚀防控研究
摘要：针对一台1 000 MW超超临界双切圆锅炉结焦及水冷壁高温腐蚀问题，采用X射线衍射(X-ray diffraction，XRD)和X射线荧光光谱(X-ray fluorescence，XRF)表征分析了锅炉结焦及高温腐蚀机理，结果表明：煤中钠、钙的赋存降低了煤的灰熔点，造成锅炉结焦；硫化物型高温腐蚀是该锅炉高温腐蚀的主要类型。通过配煤掺烧及配风调整对入炉煤质、燃烧器配风方式的优化发现，选用低硫低结焦性煤进行混配，能够有效缓解炉内结焦问题。同时，锅炉总风量的提高与燃烧器二次配风的合理调整能有效降低炉内还原性气氛浓度，缓解炉内高温腐蚀问题。通过数值模拟方法对锅炉腐蚀倾向的预测结果表明，炉内热角区域需要通过加设贴壁风或水冷壁喷涂等方式进一步预防高温腐蚀。
Abstract:Aiming at the problems of slagging and high temperature corrosion of water wall in a 1 000 MW ultra-supercritical double tangential boiler, the mechanism of slagging and high temperature corrosion of boiler was analyzed by X-ray diffraction (XRD) and X-ray fluorescence (XRF).The results show that the presence of sodium and calcium in coal reduces the ash melting point of coal, causing boiler slagging. Sulfide-type high temperature corrosion is the main type of high temperature corrosion of the boiler. Through coal blending optimization and air distribution adjustment, the coal quality feeding into the furnace and the air distribution mode of the burner were optimized. The results show that selecting low-sulfur and low-slagging coal for blending can effectively alleviate the problem of slagging in the furnace. The increase of the total air volume of the boiler and the reasonable adjustment of the secondary air distribution of the burner can effectively reduce the concentration of the reducing atmosphere in the furnace, and alleviate the problem of high temperature corrosion in the furnace. The prediction results of boiler corrosion tendency by numerical simulation method show that the high-temperature corrosion should be further prevented in the hot corner area of the furnace by adding adherent wind or water wall spraying.
标题：1 000 MW超超临界双切圆燃烧锅炉结焦与高温腐蚀防控研究
title:Research on Slagging and High Temperature Corrosion Prevention and Control of a 1 000 MW Ultra Supercritical Double Tangentially Fired Boiler
作者：刘胜利, 张海军, 程建, 钟毓秀, 徐俊, 江龙, 汪一, 苏胜, 胡松, 向军
authors:Shengli LIU, Haijun ZHANG, Jian CHENG, Yuxiu ZHONG, Jun XU, Long JIANG, Yi WANG, Sheng SU, Song HU, Jun XIANG
关键词：煤粉锅炉,双切圆燃烧,结焦,高温腐蚀,还原性气氛,
keywords:pulverized coal boiler,double tangential combustion,slagging,high temperature corrosion,reducing atmosphere,
发表日期：2023-04-30
- 文件大小:
- 3.36 MB
- 下载次数:
- 60
-
高速下载
|
|
