Graded air-feed dual-swirled pulverized coal industrial furnace combustor

Abstract

The invention discloses a graded air-feed dual-swirled pulverized coal industrial furnace combustor, solving the problem of lower combustion efficiency of the conventional coal industrial furnace. The graded air-feed dual-swirled pulverized coal industrial furnace combustor comprises two parts, namely a secondary air box and a graded air box which are partitioned by an annular baffle plate; a pre-combustion chamber is arranged in the region which is enclosed by the secondary air box and the graded air box; the front section of the pre-combustion chamber is cylindrical; the middle section of the pre-combustion chamber is of a divergent conical cylinder shape; the rear section of the pre-combustion chamber is a cylinder; the front section of the pre-combustion chamber is enclosed in the secondary air box, and communicated with the secondary air box through a secondary air swirler; the middle section of the pre-combustion chamber and the rear section of the pre-combustion chamber are enclosed in the graded air box, and separated from the graded air box through an annular water cooling jacket; a graded air swirler is arranged in the outlet of the pre-combustion chamber; a primary air pipe is inserted into the pre-combustion chamber after penetrating through the secondary air box; a reflective ignition gun is inserted into the pre-combustion chamber through the centre of the primary air pipe; and the ignition position of the reflective ignition gun is arranged in the centre of the pre-combustion chamber. According to the graded air-feed dual-swirled pulverized coal industrial furnace combustor, disclosed by the invention, pulverized coal and air can be better ensured to be mixed uniformly, so that a better heat-exchange effect is reached.

Description

technical field [0001] The invention relates to a burner, in particular to a burner for a graded air supply double swirl pulverized coal industrial boiler. Background technique [0002] There are more than 400,000 coal-fired industrial boilers in operation in my country today, and the total amount of raw coal consumed by the coal-fired industry is close to 500 million tons each year, but there are generally problems such as backward technology, poor economy, and high energy consumption. According to statistics, the average The operating efficiency is only 68%, and the average operating efficiency of small-capacity boilers is only about 55%. Most of the traditional coal-fired industrial boilers use the chain furnace to organize the combustion of lump coal, but due to the defects of the chain furnace's own furnace type characteristics and combustion methods, it is difficult to further improve its combustion efficiency. . [0003] The use of pulverized coal suspension combusti...

AI Technical Summary

Problems solved by technology

At present, most of the power plant boilers that use the suspension combustion method to organize pulverized coal combustion are power plant boilers with a large furnace space. However, due to the small furnace space of industrial boilers, it is difficult to organize a well-organized aerodynamic field to ensure the combustion of pulverized coal. Therefore, in industrial boilers, especially It is rarely used in small and medium capacity industrial boilers

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