Importance

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Abstract

A gravimetric control system for supplying fuel and sorbent to a circulating fluidized bed boiler which includes a loop shaped continuous belt for moving materials in a generally horizontal direction. The apparatus includes first and second belt scales disposed at spaced axial points along the belt and apparatus for continuously moving the belt sequentially past the first belt scale and then past the second belt second belt scale and then dumping all material on the belt. In addition the apparatus may include first apparatus for depositing fuel on the continuous belt before the first belt scale whereby the fuel will continue past the first belt scale and the second belt scale and will then be dumped off the belt and second apparatus for depositing sorbent material on the continuous belt intermediate the first and second belt scales so that first belt scale measures the quantity of fuel added to the continuous belt and the second belt scale measures the weight of both the fuel and the sorbent added to the belt. In addition the apparatus includes apparatus for determining the time required for fuel on the belt to move from the location of the first belt scale to the second belt scale and apparatus for comparing the weight at the first belt scale, after the lapse of the time required for fuel to pass from the first belt scale to the second belt scale to the instantaneous weight of fuel and sorbent at the second belt scale. In some forms of the apparatus the sorbent feeder apparatus includes a rotary valve and the apparatus for controlling the quantity of fuel delivered to the associated combustion process in the boiler includes a motor for driving the belt. The apparatus for controlling the motor for driving the belt may further include an input from the first belt scale.

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First Claim