一种基于和利时DCS的热电厂母管制锅炉负荷分配的优化控制方法

An Optimal Control Method for Load Distribution of Main Tube Boiler in Thermal Power Plant Based on Hollysys DCS

热电厂具有供电和供热的双重功能,比普通电厂拥有更高的能源利用率,广泛存在于电力、石化、冶金、造纸和热电联产等企业之中。多数企业热电厂为更灵活满足生产热负荷需求,普遍采取多炉母管制运行方式,多炉蒸汽在母管混合后统一为后续生产的热负荷,因此母管蒸汽压力的稳定性对后续工艺生产至关重要。要实现母管蒸汽压力稳定控制就需要考虑各炉的负荷的平衡分配,因多台锅炉的燃烧状态不统一,多台炉并列运行时往往存在抢负荷现象,导致锅炉之间负荷偏差较大,在生产热负荷需要求变化时不能及时响应,母管压力波动大,给后续生产运行稳定带来较大影响。本文针对此问题进行了分析探索,设计了一种基于和利时DCS母管制锅炉在一定偏差基础上负荷分配的控制方法。

Thermal power plants have dual power supply and heat supply functions, and have higher energy utilization than ordinary power plants. They are widely used in electric power, petrochemical, metallurgical, papermaking, cogeneration and other enterprises. In order to meet the production heat load demand more flexibly, most enterprise thermal power plants generally adopt the operation mode of multi furnace main pipe, and the steam of multiple furnaces is unified as the heat load of subsequent production after mixing in the main pipe. Therefore, the stability of steam pressure in the main pipe is very important for subsequent process production. To realize the stable control of header steam pressure, it is necessary to consider the balanced distribution of the load of each boiler. Because the combustion state of multiple boilers is not unified, there is often a load grab phenomenon when multiple boilers operate in parallel, resulting in a large load deviation between boilers, which cannot respond in time when the production heat load needs to change. The header pressure fluctuates greatly, which has a great impact on the stability of subsequent production and operation. This paper analyzes and explores this problem, and designs a load distribution control method based on Hollysys DCS master tube boiler based on the certain deviation.