摘要
针对从芬兰的Ahlstrom公司全套引进的Pyroflow型循环流化床锅炉省煤器频繁爆管的问题,曾采取在省煤器易磨损处增设防磨护瓦的方法,但仍未从根本上解决此问题。为此,深入分析了省煤器处烟气流道的几何形状、烟气流速、烟气中固体物料浓度对省煤器爆管的影响,并据此制定了如下解决措施:更换省煤器区域的外墙板;在一级过热器烟道出入口处的前后墙内侧增加了折流板;增加省煤器区域的烟道深度;减少省煤器列管列数;增大列管节距;在省煤器的所有列管弯头加装半圆形防磨护瓦;增大旋风分离器排气管的插入深度;在碎煤机前增加一滚轮式振动筛;改用灰分含量不大于38%的煤。改造措施实施后,该锅炉现已连续运行2a多,省煤器未再发生爆管。
A circulating fluidized bed (CFB) boiler of Pyroflow type in our company is imported completely from Ahlstrom company, Finland. There always existed tube rupture in its economizer. It was not effective though we employed tiles for wear-proof at the positions easy to wear out in the economizer. We deeply analyzed the geometric shape of the flue gas pass, flow speed of flue gas and particle concentration in flue gas that influenced tube rupture and worked out solutions for this problem. We changed the wall plate near the economizer zone, mounted deflectors at both inlet and outlet of the flue gas pass in primary superheater section inside the front wall and the rear wall, deepened the flue gas pass in the economizer zone, reduced the tube arrays and enlarged the spacing of the economizer, added semi-circle anti-wearing tiles at elbows of all the tubes, increased the inserting depth of cyclone vent tube, mounted a roller type vibrating screen at the inlet of coal crusher, used coal of ash content less than 38%, etc. After modification, this boiler has been in continuous operation for more than two years without tube rupture happening in its economizer.
出处
《中国电力》
CSCD
北大核心
2005年第5期66-68,共3页
Electric Power
