Abstract: A self-cleaning sorbent injection lance includes a lance arm, a lance outlet connected to a sorbent arm, a sorbent inlet connected to the lance arm, an air control valve connected to the lance arm, and a electrical valve control connected to the air control valve. The sorbent inlet provides sorbent material passing through the lance arm. The electrical valve control opens the air control valve when receiving an electrical signal, so that compressed air is supplied to the injection lance for cleaning sorbent material clogged in the lance arm and lance outlet without taking the self-cleaning sorbent injection lance off-line.

Abstract: An up-flow fluidized bed dry scrubber and a method of operating same. The scrubber includes up-flow reactors. The reactors receive an exhaust gas flow containing pollutants and each reactor includes one or more spray lances that inject a dry, powdered sorbent into the flow vertically onto material dispersion assemblies installed in the reactor and one or more dual-fluid spray lances with multiple spray nozzles that introduce humidification water into the flow in the reactor. The sorbent and the humidification water combine to create a fluidized sorbent bed in the flow when the flow is sufficient to suspend the fluidized sorbent bed in the reactor, in which pollutants react with the sorbent in the bed and are removed from the gas as the gas flows through the bed in the reactor.