Slurry control system
AssigneeALSTOM Technology Ltd
InventorsTravis Dwight Reynolds, Dwight Arnold Goodman, Thomas Edwin Pearson, Dana Humphreys
Life of this patent
Estimating the term…
Abstract
A system for regulating an amount of fresh lime slurry introduced to a spray dry absorber. The control system includes a controller configured to receive input from a continuous emissions monitoring system (CEMS), a valve in communication with the controller and a spray dry absorber suction pump, the valve adapted to regulate an amount of fresh lime slurry provided to the spray dry absorber suction pump and a valve in communication with the controller and a pre-mix tank, the valve adapted to regulate an amount of fresh lime slurry provided to the pre-mix tank.
Claims6
Apparatus for supplying recycled ash into a dry flue gas desulfurization (DFGD) system, the apparatus comprising:
- a pre-mix tank configured to receive and combine recycled ash, water, and a fresh lime slurry from a slurry storage tank to form a slurry;
- an ash make-up tank configured to receive and combine the slurry from the pre-mix tank with a returned non-atomized reagent slurry from the DFGD system to form a feed slurry;
- a feed tank configured to receive the feed slurry from the ash make-up tank for combination with fresh lime slurry from the slurry storage tank downstream of the feed tank to form the reagent slurry supplied into the DFGD system;
- a continuous emissions monitoring system arranged in a stack of the DFGD system operative to measure flue gas SOx concentrations;
- and
- a controller operable to receive input from the continuous emissions monitoring system and operable to regulate a supply of fresh lime slurry from the slurry storage tank to the pre-mix tank based on the input.
Apparatus for supplying recycled ash into a dry flue gas desulfurization (DFGD) system comprising:
- a collector for ash separated from flue gas downstream of a spray dry absorber of the DFDG system;
- a pre-mix tank configured to receive and combine recycled ash from the collector, water, a fresh lime slurry from a slurry storage tank and a returned non-atomized reagent slurry from the spray dry absorber to form a feed slurry;
- a feed tank configured to receive the feed slurry from the pre-mix tank for supply to and combination with fresh lime slurry in a suction pump to form a reagent slurry supplied into the spray dry absorber;
- a continuous emissions monitoring system arranged in a stack of the DFGD system operative to measure flue gas SOx concentrations;
- and
- a controller operable to receive input from the continuous emissions monitoring system and operable to regulate a supply of fresh lime slurry from the slurry storage tank to the pre-mix tank based on the input.
Dependencies are inferred from the claim text.