METHOD FOR AUTOMATIC CONTROLLING OF PROCESS OF ROASTING NICKEL CONCENTRATE IN FLUIDIZED BED FURNACE Russian patent published in 2003 - IPC

FIELD: nonferrous metallurgy. SUBSTANCE: method involves dividing basic parameter range into a number of regions; determining reference of basic parameter to one of regions; changing charge of bulk material depending on region of basic parameter. Basic parameter is temperature in furnace reaction zone. Temperature range is divided into regions: , temperature gradient and its direction are additionally set and, depending upon combinations with temperature range and temperature gradient, one of three modes of controlling fluidized bed furnace operation is selected: T∈(800-850)^°C and gradient temperature of any, T^°∈(850-900)^°C and gradient T≤0 - process is referred to region T_-1, process is carried out with operating burners until transmission of process to T₀ region; T∈(850-900)^°C and gradient T > 0, T∈(900-1130)^°C and gradient T of any, T∈(1130-1150)^°C and gradient T≤0 - process is referred to To region and carried out in automatic mode including calculation of controlling effect of bulk material charge value by analytical polynomials; T∈(1130-1150)^°C and gradient T>0, T∈(1150-1200)^°C and gradient T any - process is referred to T₊₁ region. After 6-8 min duration of process in said state, automatic controlling of bulk material charging process is stopped. Information on current roasting parameters is indicated on operator's monitor. Process is carried out at increased dust supply rate until transmission of process to To region. EFFECT: increased efficiency of fluidized bed furnace. 3 dwg, 7 ex