干熄焦系统温度模糊串级PID控制策略

Fuzzy-cascade PID Method for Temperature Control in Coke Dry Quenching

干熄焦生产过程中产生大量热能用于生产蒸汽发电,既保护了环境、节省了能源,还提高了焦炭质量。然而,蒸汽发电过程中要求蒸汽温度恒定在局部范围内,但负载变化等因素会对蒸汽温度稳定产生严重影响。该文针对以上问题,在干熄焦锅炉蒸汽发电系统中,改进了传统的串级PID控制方法 ,利用主蒸汽温度与设定值之差实现主蒸汽温度"粗调"。在此基础上,综合考虑反应负载的主蒸汽流量、主蒸汽压力等因素,进一步"细调"减温水流量。为进一步优化系统控制性能,对起主要作用的主蒸汽温度控制回路引入模糊控制策略,实现了更稳定的蒸汽温度控制。该方法已成功应用于某钢厂干熄焦主蒸汽温度调控中,并取得了良好的应用效果。

In the production processing of in coke dry quenching,generates exists a lot of hot energy,which can be used to produce steam and steam was used to generate power. For many reasons the power station requires that the temperature must be kept in a narrow scope,but the load various often in practice and this will affect steam temper- ature seriously. To solve this problem,an improved method was proposed in this paper,by which a primary control- ling output was achieved. On the base of primary control,combined with steam flow,steam pressure,etc, a refined control method was provided for coal water flow. For further more optimize resuhs,a fuzzy cascade control was pro- vided to make the steam temperature in a more stable status. The method proposed has been applied in a coke dry quenching system to control the main steam temperature successfully,and the results shows that it was very effective- ness in the steam temperature control.