The boiler (1) has side tubed walls (2) enclosing an inner space (3) and a device for selective non catalytic reduction (7). The device for selective non catalytic reduction (7) has a lance (8) carrying a hose (9) having at least a nozzle (10) and a hose drive mechanism (11) for driving the hose within the lance. The lance (8) protrudes into the inner space (3) from a side tubed wall (2) of the boiler (1).

The boiler (1) has side tubed walls (2) enclosing an inner space (3) and a device for selective non catalytic reduction (7). The device for selective non catalytic reduction (7) has a lance (8) carrying a hose (9) having at least a nozzle (10) and a hose drive mechanism (11) for driving the hose within the lance. The lance (8) protrudes into the inner space (3) from a side tubed wall (2) of the boiler (1).

A mixer and a method therein, including feeding a rotating flow of exhaust gas in a mixing pipe towards a turning end of a mixing chamber; dosing reactant by a doser against the rotating flow around a centreline of the mixing pipe; maintaining a guide around the doser such that a front face of the guide faces the rotating flow, and the guide defines a central opening surrounding the doser; guiding a side flow out of the rotating flow to a carrier flow around the doser via the central opening; and inhibiting by the guide turbulence from being transferred from the side flow to the carrier flow.

A mixer and a method therein, including feeding a rotating flow of exhaust gas in a mixing pipe towards a turning end of a mixing chamber; dosing reactant by a doser against the rotating flow around a centreline of the mixing pipe; maintaining a guide around the doser such that a front face of the guide faces the rotating flow, and the guide defines a central opening surrounding the doser; guiding a side flow out of the rotating flow to a carrier flow around the doser via the central opening; and inhibiting by the guide turbulence from being transferred from the side flow to the carrier flow.

A process gas suction structure for preventing a generation of products from a process gas due to a temperature drop is disclosed. The process gas suction structure includes a double tube structure, and a heating device configured to heat the double tube structure. The double tube structure includes a process-gas flow passage portion where the process gas flows, and a partition portion arranged outside of the process-gas flow passage portion.

A process gas suction structure for preventing a generation of products from a process gas due to a temperature drop is disclosed. The process gas suction structure includes a double tube structure, and a heating device configured to heat the double tube structure. The double tube structure includes a process-gas flow passage portion where the process gas flows, and a partition portion arranged outside of the process-gas flow passage portion.

Systems and methods of producing a concentrated solution from a gas stream are disclosed. The method of producing a concentrate solution includes introducing the gas stream having the contaminant into an absorption chamber, introducing a dilute liquid having the contaminant into the absorption chamber, at least one of the gas stream and the dilute liquid being at an elevated temperature, and contacting the gas stream with the dilute solution to produce a liquid-enriched gas stream and a concentrate solution. The systems for producing a concentrated solution include a source of a gas stream having a contaminant, a source of a dilute solution having the contaminant, and an absorption chamber fluidly connected to the source of the gas stream and the source of the dilute solution. The source of the dilute solution can have a subsystem for removing contaminants from the gas stream, constructed and arranged to receive the gas stream or a liquid-enriched gas and produce the dilute solution.

Systems and methods of producing a concentrated solution from a gas stream are disclosed. The method of producing a concentrate solution includes introducing the gas stream having the contaminant into an absorption chamber, introducing a dilute liquid having the contaminant into the absorption chamber, at least one of the gas stream and the dilute liquid being at an elevated temperature, and contacting the gas stream with the dilute solution to produce a liquid-enriched gas stream and a concentrate solution. The systems for producing a concentrated solution include a source of a gas stream having a contaminant, a source of a dilute solution having the contaminant, and an absorption chamber fluidly connected to the source of the gas stream and the source of the dilute solution. The source of the dilute solution can have a subsystem for removing contaminants from the gas stream, constructed and arranged to receive the gas stream or a liquid-enriched gas and produce the dilute solution.

The present invention relates to coal-fired power plants and flue gas emissions and more specifically, to controlling gaseous mercury emissions in the flue gas between two or more coal fired electric generating units within a contiguous power plant site to achieve environmental regulation limits for mercury emissions. This is accomplished by continuously adjusting the application rates of mercury oxidant, which is added to a coal feed to oxidize elemental mercury for improved mercury capturability and aqueous mercury precipitant (liquid), which is added to a scrubber liquor of a wet Flue Gas Desulfurization (FGD) unit to precipitate out oxidized mercury into solid form for improved capture and disposal.

The present invention relates to coal-fired power plants and flue gas emissions and more specifically, to controlling gaseous mercury emissions in the flue gas between two or more coal fired electric generating units within a contiguous power plant site to achieve environmental regulation limits for mercury emissions. This is accomplished by continuously adjusting the application rates of mercury oxidant, which is added to a coal feed to oxidize elemental mercury for improved mercury capturability and aqueous mercury precipitant (liquid), which is added to a scrubber liquor of a wet Flue Gas Desulfurization (FGD) unit to precipitate out oxidized mercury into solid form for improved capture and disposal.