Control method and system for small pulverized coal silo feeding

A coal feeding control method for a small pulverized coal silo, used in a direct-blow pulverizing system, including the following steps:

• Step 1, acquiring a boiler load increase signal to initiate a coal feeding control system of the small pulverized coal silo, and determining a target function F(t) for boiler load control based on the boiler load increase signal, where t is a time series, with a start time of the coal feeding control system as the zero point, and an end time tend is determined by a time interval of the load increase, tend=ΔP/Δp, where ΔP is an amount of load increase per event, Δp is a target load increase rate, and F(t) is a time function of a boiler fuel signal;
• Step 2, obtaining a current coal mill output signal B(t), which is a fuel quantity signal at an outlet of the coal mill that changes over time from the start time;
• Step 3, comparing B(t) with F(t):
• if B(t) cannot meet the fuel quantity requirements of F(t), then proceed to Steps 4 and 5 to activate the small pulverized coal silo connected to the boiler;
• otherwise, the small pulverized coal silo remains inactive;
• Step 4, determining a coal feeding signal f(t) for the small pulverized coal silo based on the difference between F(t) and B(t), and further determining a coal feeding control signal f(t);
• Step 5, controlling the small pulverized coal silo to feed coal to the boiler according to the coal feeding control signal f(t), changing the combustion rate in the furnace, and increasing the boiler load.