四角切圆燃烧锅炉过热器两侧汽温偏差与管道布置的研究

针对大容量四角切圆燃煤锅炉普遍存在的烟气侧速度与温度偏差以及过热器的汽温偏差，对北疆电厂1000MW锅炉实测运行数据进行了分析，并对炉膛流场进行了模拟．结果表明：由于四角切圆锅炉炉膛上部残余旋转导致气流在屏区左右两侧形成流动差异，在折焰角前后两侧汽温偏差的分布规律截然不同．通过对电厂锅炉后屏过热器与末级过热器之间管道布置形式的调整（由交叉改为平行），使两级受热面的吸热偏差相互抵消，从而提高减温器的调节性能．

Study on Superheater Temperature Unbalance and Relevant Piping Arrangement for a Tangential Firing Boiler

To solve the unbalance problems of gas velocity and temperature distribution and the steam temperature deviation of superheater, frequently existing in large tangential firing boilers, an analysis has been performed on actual operation data of a 1 000 MW boiler in Beijiang Power Plant, while a simulation carried out on the in-furnace flow field. Results show that the gas flow fields are different at both sides of screen tubes due to the residual rotation existing in upper part of the furnace, and the steam temperatures near the baffle angle are differently distributed at both sides. By changing the arrangement of pipes between the rear screen superheater and final superheater of boiler （from cross into parallel）, the heat absorption deviation between two stages of heating surfaces are offset, which helps to improve the regulation performance of relevant attemperators.