This article is the analysis and design for boiler steam temperature control system , and a good control of the steam boiler system is to ensure the stability of the output steam temperature , so the system uses the cascade control system , which can greatly eliminate the control system work various confounding factors , the system can work in a relatively good condition , while the boiler superheater outlet steam temperature within the allowable range , and to protect the superheater tube wall temperature does not exceed the allowable operating temperature.
Steam boiler temperature is safe, efficient and economic operation of important parameters , and therefore require strict temperature control of steam , high temperature steam can cause overheating , steam pipes and steam turbine thermal stress due to excessive deformation and destruction ; steam temperature is too low , would reduce the impact caused by the thermal efficiency of the economy .
The main part of this design consideration is the temperature of the steam boiler control system design , steam superheater system includes primary superheater desuperheater secondary superheater , boiler temperature control system includes superheater and reheat steam temperature regulation . The main steam temperature and reheat steam temperature stability for safe and economic operation of the unit is very important.
The design for the boiler temperature control problem , a comprehensive application process control theory and the recent rise of simulation technology, computer remote control, configuration software, designed the boiler temperature cascade control system . First, create a mathematical model through experimentation boilers , boiler temperature to obtain the transfer function of the control scheme of the theoretical design through simulation, get a better response curve, providing prerequisite for the realization of the actual control system. Secondly , the use of smart meters as a controller, field instrumentation process control system established by parameter tuning, get a better scene control. Again, the integral PID control algorithm to achieve separation .
KEY WORDS: Steam temperature;Cascade Control System;PID control