FLOW CONTROL METHOD FOR COAL-LIQUID-MIXTURE SLURRY

摘要

PURPOSE:To make it possible to distribute highly viscous fluid such as coal- water-mixture slurry (CWM) etc. in response to the intended proportion, by connecting piping for blowing-in gas between a flow shut-off valve provided in a feed line and a tuyere, controlling the flow rate of fuel to be fed. CONSTITUTION:CWM produced in a CWM manufacturing facility 14 is distributed from a header 1 to a plurality of branch pipes 2. After flow rate is measured y a flow meter 4 provided in each of the branch pipes 2, CWM is blown into a tuyere 6 of a blast furnace 7 through a burner 11 provided in a blow pipe 10. The flow rate of CWM is controlled by adjusting the quantity of nitrogen or air blown into the feed line downstream the flow meter 4. Blow-in rate of nitrogen or air is regulated by feeding back measured values of the flow meter 4, which are transmitted by a transmitter 8 through a controlling and adjusting means 12 to a flow control valve 5. Flow control is performed in such a manner that opening of the control valve 5 is controlled by means of a controller 12 having quick responsiveness of PLD etc. so as to keep always a set flow rate value of CWM. Therefore, the flow rate of CWM will be smoothly controlled by adjusting the opening of the controller 5, thus regulating the flow rate of nitrogen or air.