The present invention relates to an over fire air arrangement for a furnace (1), the furnace (1) having opposing first wall (4) and second wall (6) and opposing first side wall (5) and second side wall (7) between the first and second walls (4, 6) for forming a furnace enclosure (2). The over fire air arrangement comprising at least one first over fire air port (20) provided to the first wall (4) for supplying a first over fire air flow (40) into the furnace (1) and at least one first additional over fire air port (50) provided to at least one of the first and second side walls (5, 7) in the vicinity of the first wall (4), the at least one first additional over fire air port (50) being arranged to supplying a first additional over fire air flow (60) into the furnace (1) transversely to the first over fire air flow (40).

The present disclosure relates to a system and a method for combustion of solid fuels. The combustion system includes burners which supply a mixed flow of fuel and air through a fuel nozzle to the combustion chamber for example of a boiler. The mixed flow of fuel and primary air is supplied to the burner through a duct from a pulverizer where the fuel is grinded to the required finesse. The duct further bends in such a way that one portion is vertical with respect parallel to axis of the boiler 1 A-A is vertical duct and other portion is horizontal duct which is parallel to axis B-B of the fuel nozzle.

In staged combustion, wherein fuel is fed into a furnace, and less than all of the gaseous oxidant needed to completely combust the fuel is fed with the fuel and combusted, providing uncombusted fuel, and the remaining portion of gaseous oxidant needed to combust the fuel is fed into the furnace through a second port, fuel is fed and combusted at the second port to heat the second port and lessen the tendency of deposits to form at the second port.

A method is provided for controlling airflow into a furnace that employs a velocity type damper. In one embodiment, the method for controlling airflow may include engaging a velocity type damper to an air port opening of a furnace. The velocity type damper includes at least one air controlling surface that is positioned proximate to a wall of the furnace at the air port opening so that air velocity exiting the at least one air controlling surface is substantially equal to the air velocity entering the air port opening to the furnace. The method may further include adjusting a cross sectional area through the velocity type damper to control air velocity into the furnace through the air port opening.

The present application provides a tangentially fired boiler. The tangentially fired boiler may include a combustion chamber and an overfire air system positioned about the combustion chamber. The overfire air system may include a number of overfire air windboxes positioned in a horizontal orientation.

An oxy-fuel burner including a central burner element having a central conduit terminating in a central nozzle and an annular conduit terminating in an annular nozzle surrounding the central conduit, the central conduit flowing a first reactant and the annular conduit flowing a second reactant; a first staging conduit spaced apart from a side of the central burner element and terminating in a first staging nozzle; a second staging conduit spaced apart from an opposite side the central burner element and terminating in a second staging nozzle; a first mechanism to apportion a flow of the second reactant into a non-zero primary flow of the second reactant directed to the annular conduit and a non-zero secondary flow of the second reactant; and a second mechanism to selectively apportion the secondary flow of the second reactant between the staging conduits; wherein one reactant is fuel and the other reactant is oxygen.

This solid fuel burner is provided with: a venturi tube in which a channel for mixed fluid in a fuel nozzle narrows toward the center in the channel cross section; a fuel concentrator that imparts, to the mixed fluid, a velocity component away from the center of the fuel nozzle; and a channel separation member that separates the channel of the fuel nozzle into an internal side and an external side; wherein the channel separation member is shaped in such a way that the cross sectional area of an external channel is larger at the downstream end than at the upstream end, and the upstream end of the fuel concentrator is located between the upstream end and the downstream end of an expanded portion of the venturi tube. This solid fuel burner prevents solid fuel particles, which is ground biomass fuel, from adhering and depositing inside the nozzle.

The pre-mix burner assembly includes a jet pump comprising a suction chamber, a flue gas inlet, and a combustion air tube with a combustion air nozzle. The combustion air inlet includes a combustion air tube with a tapered nozzle, and it is connected to a combustion air fan. The flue gas inlet is connected to the suction chamber and the combustion air fan. The suction chamber surrounds the combustion air tube, and it has a jet pump nozzle with a discharge. The assembly includes a fuel gas inlet connected to the combustion air tube. The combustion air and fuel gas mixture exits the combustion air nozzle creating a negative pressure in the suction chamber and drawing flue gas into the suction chamber. The assembly includes a mixing tube positioned downstream of the jet pump discharge, and a burner block connected to an outlet of the mixing tube.

The present invention relates generally to the field of emission control equipment for boilers, heaters, kilns, or other flue gas-, or combustion gas-, generating devices (e.g., those located at power plants, processing plants, etc.) and, in particular to a new and useful method and apparatus for: (i) reducing halogen levels necessary to affect gas-phase mercury control; (ii) reducing or preventing the poisoning and/or contamination of an SCR catalyst; and/or (iii) controlling various emissions. In still another embodiment, the present invention relates to a method and apparatus for: (A) simultaneously reducing halogen levels necessary to affect gas-phase mercury control while achieving a reduction in the emission of mercury; and/or (B) reducing the amount of selenium contained in and/or emitted by one or more pieces of emission control equipment for boilers, heaters, kilns, or other flue gas-, or combustion gas-, generating devices (e.g., those located at power plants, processing plants, etc.).

The present invention relates to an over fire air arrangement for a furnace (1), the furnace (1) having opposing first wall (4) and second wall (6) and opposing first side wall (5) and second side wall (7) between the first and second walls (4, 6) for forming a furnace enclosure (2). The over fire air arrangement comprising at least one first over fire air port (20) provided to the first wall (4) for supplying a first over fire air flow (40) into the furnace (1) and at least one first additional over fire air port (50) provided to at least one of the first and second side walls (5, 7) in the vicinity of the first wall (4), the at least one first additional over fire air port (50) being arranged to supplying a first additional over fire air flow (60) into the furnace (1) transversely to the first over fire air flow (40).