Vertical boiler with powder burner at bottom

Abstract

The invention discloses a vertical boiler with a powder burner at bottom. The boiler comprises a boiler body and the burner, wherein the burner is arranged at the bottom of the boiler body and comprises one-time powder feeding wind mixed with low-oxygen wind, three-time low-oxygen return wind, two-time combustion-supporting wind and four-time return wind which are sequentially formed from inside to outside. The boiler with the burner at bottom has the advantages that the bottom temperature of the boiler and the temperature of a high-temperature region of a hearth are reduced through a series of techniques, so that the discharge of nitrogen oxides is effectively controlled, the problems of coking and the like in the hearth are solved, and further, the burner can be arranged at the bottom of the boiler; compared with a conventional arrangement way, the way of arranging the burner at the bottom of the boiler has the beneficial effects of simplifying a coal powder conveying system, greatly reducing the powder feeding height, optimizing coal powder conveying power, saving energy consumption, solving the problem that a metal wear-resisting bend of a coal powder conveying pipe is prone to being worn, and reducing installation and use costs; and the space in a boiler room is saved as the burner is arranged at the bottom of the boiler, and the burner can be conveniently adjusted and maintained.

Description

technical field [0001] The invention relates to a vertical boiler combustion technology, in particular to a bottom-mounted vertical boiler with a powder burner. Background technique [0002] In the Twelfth Five-Year Plan, my country emphasized the goal of protecting the environment, saving energy and reducing emissions. It has become an urgent trend to replace the old chain grate coal-fired boilers with pulverized coal-fired boilers in the boiler industry. At present, the commonly used arrangements of the burners of pulverized coal-fired boilers include overhead combustion, W-shaped combustion, V-shaped combustion, and four-corner combustion. The structures of the four arrangements are shown as follows Figure 6-9 As shown, the burner 3' is arranged on the pulverized coal boiler 1' in a corresponding arrangement, and the lower end of the powder bin 2' is pulled out of the delivery pipeline to connect to the burner 3', and the delivery pipeline usually needs to be equipped wit...

AI Technical Summary

Problems solved by technology

At present, the vertical boilers with commonly used arrangements of burners cannot effectively solve the problems of coking and large amount of nitrogen oxides, and also have the following disadvantages: the pulverized coal conveying system is not simplified enough, the powder feeding height is high, and the pulverized coal consumption The transmission power is large, the metal wear-resistant elbows of the pulverized coal delivery pipe are often used and are easily worn, the installation and use costs are high, the boiler room occupies a large area, and it is not conducive to the adjustment and maintenance of the burner, etc.

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