浆液循环泵变频改造方案探讨

Discussion on frequency conversion transformation scheme of slurry circulating pump

基于某2×300 MW亚临界循环流化床机组企业,烟气存在入口SO_(2)浓度值波动大,且SO_(2)浓度值波动没有规律,随机性较强的特点。脱硫装置运行过程中,石灰石-石膏浆液循环量需要根据机组运行负荷、烟气参数的变化进行调整,为保证出口SO_(2)浓度达标排放,通常开启三台浆液循环泵,导致工频浆液循环泵出现“大马拉小车”现象。本文探讨了对浆液循环泵的变频改造,根据企业实际运行工况对浆液循环泵进行变频改造分析,结果表明,选定四台浆液循环泵中的B泵进行变频改造,计算浆液循环泵变频范围为45~50 Hz,在满足达标排放的同时达到节能降耗的目的。

Based on one 2×300 MW subcritical circulating fluidized bed unit enterprise,the SO_(2) concentration at the inlet of the flue gas fluctuates greatly,and the SO_(2) concentration fluctuates irregularly with strong randomness.During the operation of the desulfurization unit,the circulating volume of limestone gypsum slurry needs to be adjusted according to the operating load of the unit and the change of flue gas parameters.In order to ensure that the SO_(2) concentration in the flue gas at the outlet meets the discharge standard,three slurry circulating pumps are usually started,resulting in the phenomenon of"big horse pulling small car"of the power frequency slurry circulating pump.This paper discusses the frequency conversion transformation of slurry circulating pump,and analyzes the frequency conversion transformation of the slurry circulating pumpaccording to the actual operating condition of the enterprise.The results show that the B pump of four slurry circulating pump is selected for frequency conversion transformation,calculates the frequency conversion range of slurry circulating pump is 45~50 Hz,and achieves the purpose of energy saving and consumption reduction while meeting the standard emission.