Design Of Controller In Blast Furnace Top Pressure Recovery Turbine Device

Blast Furnace Top Gas Pressure Recovery Turbine System, called TRT for short, is a kind of high efficient blast furnace top pressure secondary energy recovery device. It acts through the blast furnace top gas import turboexpander, so that the blast furnace top gas pressure and heat converts into mechanical and drives generator, means that the device recovers the electrical energy which is transformed from high-pressure gas through the pressure relief valve to drain directly, in order to reduce the pollution to the environment produced in the blast furnace iron making process. TRT device has a low cost of power generation, without pollution and hazards, energy recovery effect is remarkable. As a ancillary equipment of blast furnace, the premise of TRT device operation is the protection of blast furnace top pressure stable, thus it does not affect the main ironmaking process technology.The major loop and minor loop in traditional blast furnace pressure recovery power device top pressure control system usually employ classical loop PID control algorithm to realize the stability of the controlled device. However, there exists some problems using this control algorithm, such as Parameters adjustment inconvenience, not-very-strong anti-jamming, weak adapting and adjusting ability to the time-varying and delay object, etc. This topic gets the features of the controlled object in blast furnace pressure recovery turbine device top pressure control system through theoretical modeling for the controlled system, and combining with the simulation analysis of the control algorithm, and determines the use of PID (IMC-PID) control algorithm which is based on the internal model.In order to solve the problem of the control system of deputy circuit can not be applied to advanced optimal control algorithms, and achieve the requirements of high integration, high-speed and high stability, this design is for the minor loop of TRT top pressure control system. It devised digital electro-hydraulic servo control system on basis of FPGA system, the hardware language VHDL were adopted to realize FPGA-based programmable systems, instead of the originally constituted by the hardware system interfaces and peripherals, and improve the processing speed and reliability of operation of the system. Meanwhile, modular structured software programming ideas were adopted to realize the writing of the embedded function software in the top pressure controller of blast furnace pressure recovery device.The result indicates that TRT top pressure control system, based on the IMC-PID controller obviously improved the control effect, compared with the traditional TRT top pressure control system. In addition, control system tracking performance and anti-jamming ability were further enhanced. Thereby, it achieved the aim to optimize the system control performance and met the control requirements of the system.