Center-feeding cyclone pulverized coal combustion device adopting pre-combustion chamber and double-layer jet flow to separate secondary air

Abstract

The invention discloses a center-feeding cyclone pulverized coal combustion device adopting a pre-combustion chamber and double-layer jet flow to separate secondary air, and relates to a pulverized coal combustion device, and the center-feeding cyclone pulverized coal combustion device solves the problems that an existing pulverized coal combustion device is high in NOx discharge amount, is poor in flame stability, is severe in slag-bonding and is poor in after-combustion. High-concentration pulverized coal gas flow is conveyed in a primary air tube; a cyclone pulverized coal combustor is arranged at the front end of the pre-combustion chamber; the cyclone pulverized coal combustor and the pre-combustion chamber are coaxially arranged, and each pipeline spray hole of the cyclone pulverizedcoal combustor is flush to the inner wall of the pre-combustion chamber; a plurality of separating secondary air spray holes are distributed at the outer side of the pre-combustion chamber in a double-layer annular mode; a circle on which the centers of each layer of separating secondary air spray holes are located is coaxial with the cyclone combustor; the two layers of separating secondary airspay holes are uniformly crossed with one another; each separating secondary air spray hole is flush to the inner wall of a furnace hearth; and included angles beta between the center lines of the separating secondary air spray holes and the axis of the air tube at each stage of the cyclone combustor are 0-60 degrees. The center-feeding cyclone pulverized coal combustion device is used for an industrial pulverized coal boiler.

Description

technical field

[0001] The invention relates to a pulverized coal combustion device for an industrial boiler, in particular to a pulverized coal combustion device with a central powder feeding swirling flow that adopts a pre-combustion chamber and double-layer jets to separate secondary air. Background technique

[0002] In my country, coal-fired industrial boilers are the main coal-consuming equipment except power plant boilers, with a total of nearly 600,000 units and an annual coal consumption of nearly 640 million tons. Traditional coal-fired industrial boilers are mainly layer-fired furnaces, that is, fuel is placed on a fixed or moving grate to form a fuel layer, and air is introduced from the bottom of the grate to carry out combustion reactions through the fuel layer. It generally has the problem of low boiler thermal efficiency. Compared with the layer-fired furnace, the industrial pulverized coal boiler adopts the chamber combustion combustion method, and the pulv...

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