Stability Analysis And Control Experimental Investigation On The Top Pressure Of Blast Furnace In A TRT Unit

The blast furnace top pressure power recovery turbine unit (briefly as TRT) makes use of pressure energy from the process gas of a blast furnace, driving a turbine for power generation, which also eliminates noise pollution caused by relief valve group and avoids waste of gas pressure energy caused by throttle of relief valve group. So TRT unit is an equipment of low investment, high output and environment protection. Meanwhile, as TRT is popularized, customers often worry about instability of the blast furnace top pressure caused by TRT unit and the influence on the product when TRT unit is applied for power generation. Consequently, it is more and more important to keep the stability of the blast furnace top pressure. And how to keep the stability of the blast furnace top pressure becomes on of the urgent problem in improving the ability of competition of TRT and the popularity of TRT.Based on the theory of fluid mechanics, we analyzed the instability of the blast furnace top pressure in the TRT system in detailed and derived the physical and mathematic models (system balance control equations) according to analysis of TRT system. We established the control and experimental system for research and test of TRT top pressure stability and solve the problem of the blast furnace top pressure successfully. Meanwhile, The STPC control software devised by us is based on the SIMENS WINCC system. We also do a lot of experiment to STPC control software on the TRT control and experimental system. And all of the results indicated that the STPC control software is very effective on controlling the blast furnace top pressure when TRT works and it is easily popularized.The major conclusion has been obtained as follows:(1) We firstly analyze the pipe system in the TRT system theoretically by the theory of fluid mechanics and established the physical and mathematic models. The STPC control software is developed to solve the keep the stability of the blast furnace top pressure.(2) The control and experimental system for research and test of TRT top pressure stability is established firstly. And the STPC control software has been testified successfully in the experimental system.(3) STPC software developed by the authors have more advantages compared with the optimized PID controller (the control method is mostly adopted in TRT products) under the same condition of the TRT system test device and the two indexesof top pressure offset peak value and peak value lasting time have greatly improved in emergency change-over and stator blades stabilization process.The production of present dissertation had passed through the authenticated by the Science Committee of Shan Xi province and wined the second price of the China mechanical engineering science technology.