Research Of Operating And Trouble Elimination In 440T/H CFB Boiler

Based on the four 135MW 440t/h CFB (Circulating Fluidized Bed) boilers'practical operating situations of JiaWang Power Plant, The burning and operating adjustment for CFB boiler were studied in this paper, and many practical ways about the CFB start-up, running, burning adjustment, and optimizing control were put forward. The paper introduced the main design parameters and the whole boiler system and its working principle of the CFB. It analyzed the start-up and stop processes, studied the running and adjustment, and brought forward the applied methods for load adjustment, bed temperature adjustment, bed pressure adjustment, return material quantity adjustment, air flow adjustment, SO2 and NOx emission control and coal granularity adjustment. It studied many kinds of common problems, such as the coal changing, the boiler slagging's influence on boiler burning, the change of bed material granularity and distribution's influence on boiler running, and brought forward applied methods to solve these problems. The running optimizing tests and burning adjustment tests for operating CFB boiler were studied,and the adjustment methods in various of conditions were put forward based on the analysis of the experimental date. It also analyzed the typical controlled object characteristics of CFB boiler and established the model, analyzed the typical modular control system of the CFB boiler, in particular, improved the control strategy on the difficulties of control system-the bed temperature control and unit coordinate control.