脱硫浆液循环系统灵活性改造及其调节性能试验

Flexibility transformation of desulfurization slurry circulating system and its adjustment performance test

目前,烟气脱硫系统普遍缺乏迅速调节及深度调节性能,需对浆液循环系统进行灵活性改造。本文建立了浆液循环管路计算模型,并根据某燃煤电厂330MW机组脱硫系统的设备情况,计算了浆液循环系统灵活性调节空间,同时进行了灵活性改造后的调节性能试验。结果表明:脱硫浆液循环系统灵活性调节空间决定其调节性能及节能效果,在改造前应对其进行计算;灵活性改造提高了脱硫系统的安全稳定性,也提高了其随原烟气SO_2质量浓度和机组负荷波动的线性调节性能及迅速调节性能,同时具备一定的深度调节性能;采用一拖二变频方式的浆液循环系统,可使灵活性调节始终处于较好的状态;该机组改造后节能效果明显,1.1年即可回收成本,但不同机组的改造成本回收周期有所不同。该结论可为浆液循环系统灵活性改造及脱硫系统运行优化提供参考。

At present,there are lacks of rapid adjustment perfbnnance and deep adjustment performance in flue gas desulfurization systems,so that flexibility transformation should be carried out for the slurry circulating system.In this study,the calculation model of slurry circulating pipeline was established,and the flexibility adjustment range for slurry circulating system was calculated according to the equipment situation of a 330 MW coal-fired power unit.Meanwhile,adjustment performance test after the transformation was carried out.The results show that,the adjustment performance and energy saving effect of the slurry circulating system depend on its flexibility adjustment range,which should be calculated before the transformation.The flexibility transformation improves the safety and stability of the desulfurization system,which has certain linear and rapid adjustment performance by following the fluctuation of SO2 mass concentration in raw flue gas and unit load,as well as certain deep adjustment performance.The slurry circulating system with the mode of one inverter for two motors can make the flexibility adjustment in a better state.There is obvious energy saving effect after the transformation in this unit,of which the cost can be recovered in 1.1 years,but the cost recovery cycle for different units will be different.The conclusion of this study can provide a guidance for flexibility transformation of slurry circulating systems and operation optimization of desulfurization systems.