| 摘要 |
<p>PURPOSE:To optimize the supply of reducing agents by controlling the rate of supplying of the reducing agents by the product of the flow rate of the SO2- contg. gas to be supplied into a reducing tower and the concn. of SO2 therein and the product of the concn. of O2 in the gas to be supplied to the reducing tower and the quantity of the air to be added. CONSTITUTION:An SO2-contg. gas is fed through a main pipeline 8 into a reducing tower 2 and is discharged as H2S into a main pipeline 9. The data calculated by reaction formulas is beforehand put into a control box 12, and the concn. of SO2 in the gas to be supplied into the tower 2 is measured with a measuring instrument 19 and is fed to the box 12. The concn. of O2 is measured with a measuring instrument 16 and is fed to the box 12. The amt. of the SO2 to be supplied is known from the product of the measured value of a gas flowmeter 8b and the concn. of SO2 and for the air to be added, the amt. of the O2 to be supplied is determined by the product of the measured value of a flowmeter 15 and the concn. of O2. Thus, the rate of supplying the reducing agents is determined, and the rate of discharging the reducing agents from a hopper 20 is determined, whereby the rate of supply of the reducing agents with good efficiency into the tower 2 is determined.</p> |
