Research And Realization Of The Control System For 3rd TRT In ShouGang

Iron and steel enterprises are the major energy customers, to make full use of secondary energy sources is an important guarantee for continuable development of the enterprises. Blast Furnace Top Gas Pressure Recovery Turbine Unit (TRT) is recognized as a valuable secondary energy recovery technology by international iron and steel enterprises. It has the great theoretical and practical significance to investigate the design and realization of the control system.Most of the domestic arrangements for the TRT technology is in the parallel form, but the 3rd TRT in ShouGang take form in series. Compared with the traditional parallel form, this form of arrangement has more advantages such as: low-pressure start, anti-resonance, multistage operation, and so on. To the 3rd TRT of ShouGang as an example, this paper discusses the TRT control in series form. First of all, the TRT production process, development of the situation at home and abroad as well as the methods of TRT control are discussed; secondly, on the basis of the in-depth study of TRT process and control requirements, TRT control of the entire process are Researched and designed including the starting of turbine, acceleration control, Pre-pressure control of the turbine, top gas pressure control of the blast furnace, normal stop and emergency stop control, power up and power down control, Nitrogen seal control and automatic control of the auxiliary equipments; furthermore, in-depth research of the control of blast furnace top pressure in the Normal operating conditions and abnormal conditions is carried out. A feed-forward compensation control is designed to settle the lag related to counteract the disturbances caused by feeding the blast furnace and totally shutting down the guide vane of turbine; The strategy of " deviation first" is also adopted to achieve the smooth control of ascending and descending power,as well as safe operation. Finally, by choosing Symphony Rack system, a complete automatic control system has been set up. The levels of supervision, operation and automatic control in the entire production process have been improved, so as to further enhance productivity and create better economic benefits.