Improvement Research Of The Control Strategy Of Superheated Steam Temperature Of The Boiler Of Power Station

Superheated steam temperature control system of boiler is one of the most essential control system of generator units in thermal power plant. The fundamental function of this system is to adjust the superheated steam temperature in a fixed range and guarantee safety and economical operation of the units. Currently, most thermal power plants apply water-spilling system for controlling over-heated steam temperature. In order to provide high quality superheated steam for turbine,cascade control system and dynamic feedforward compensation singal regarding to unit loading, air inputing and angle of burning equipment have been introduced in the system, it is still difficult to effectively control influence to the superheated steam temperature from fluctuated loading and spontaneous disturbance of burning rate. Along with the rapid development of modern fire analysis and image manipulation technologies, obtaining and rebuilding three-demission temperature information of flame in the furnace have become possible by applying C++Builder software which can furthermore calculate releasing heat from fuel through radiation energy signal. This thesis was based on the article, project of new technique research of diagnosis through the visualization of three-demission combustion and controlling load of unit, in a power station in Guangdong province and discussed the application of radiation energy signal for the superheated-steam temperature control system. The radiation energy signal can present loading level and combustion condition simultaneously. By introducing as the dynamic feedforward compensation signal in the temperature control system, it is possible to actively compensate the influence to steam temperature because of disturbance of load and burning efficiency. Under the building of dynamic feedforward compensation model of radiation energy signal vs superheated steam temperature through discriminance and analysing the dynamic characteristic of the radiation energy ,steam temperature control system with dynamic feedforward was designed and feedforward compensate unit was provided. Moreover, in order to validate the efficiency and ability of the design, the Simulink in MATLAB was also used to simulate and compare the designed system with the original one. By doing this, this paper also provided the evidence for improving the superheated steam temperature control system in thermal power plants.