流化床反应器自控系统的设计

Design of Auto-control System for Fluidized Bed Reactor

针对影响流化床反应器运行质量的3个重要指标(原料气流速、温度和反应器内的压差)的测量电路、控制电路和报警电路进行设计。原料气温度测量采用K型热电偶与K型热电偶的专用模数转换芯片MAX6675的组合,不再进行冷端温度补偿;采用卡曼涡旋式空气流量传感器,实现对原料气流量的测量;反应器内压差的测量采用由PY209构成的数字气压计实现。Proteus软件仿真结果验证了该设计的可行性。

Considering three important indicators such as the flow velocity,feed gas temperature and the differential pressure that affecting the operating quality of the fluidized bed reactor,their measuring circuit,control circuit and alarm circuit were designed. As for measuring the feed gas temperature,the combination of K-thermocouple and customized MAX6675 A/D conversion chip was adopted free of cold junction compensation;through employing Carman vortex air flow sensor,measuring feed gas flow was implemented,including having the digital barometer which consisted by PY209 used to measure the differential pressure in the reactor. Simulation with Proteus software proves the feasibility of this design.