Air port of firing fuel, method for manufacturing air port, boiler, boiler facility

Abstract

A boiler is provided with burners 101 and the air ports 100. The air port 100 is a two-stage combustion type air port for supplying air for combustion insufficiency into an incomplete combustion region with a stoichiometric air ratio or less formed in a furnace 23 by the burners 101. The air port 100 is provided with a nozzle mechanism for blowing off air for combustion including axial velocity components of air flow and velocity components toward the center, and a mechanism for changing the ratio of the velocity components. The nozzle mechanism comprises a primary nozzle 1 for blowing off primary air which advances straight in the axial direction of the air port, a secondary nozzle 2 for blowing off secondary air accompanied by swirl flow, and a tertiary nozzle 3 for blowing off air of contracted flow as tertiary air from the outside of the primary nozzle.

Description

Air port for fuel combustion, manufacturing method thereof, boiler and boiler equipment technical field The invention relates to an air port for fuel combustion and a manufacturing method thereof, a boiler and boiler equipment, an operation method of the boiler equipment and a modification method thereof. Background technique In combustion furnaces such as boilers, it is necessary to reduce the concentration of nitrogen oxides (NOx) and reduce the unburned portion, etc., and in order to meet such requirements, the post-combustion method is used. In the combustion furnace, the burner is used to form an incomplete combustion area (area with more combustible gas) below the theoretical air ratio (theoretical fuel air amount). The secondary combustion method uses the air port (rear side) installed on the downstream side of the burner. Air port) A combustion method that supplies the necessary amount of air for complete combustion to the combustible gas in the above-mentioned in...

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Problems solved by technology

However, depending on the type of fuel, the concentration of carbon monoxide (hereinafter referred to as CO) in the combustion gas may increase. Needless to say, the above-mentioned Patent Document 1 does not consider reducing the CO concentration, let alone reducing the NOx concentration and the CO concentration in a balanced manner.

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