Volute air inlet furnace smoke mixing chamber and brown coal boiler including chamber

Abstract

The invention provides a volute air inlet furnace smoke mixing chamber and a brown coal boiler including chamber including the chamber. Due to the fact that a mixing portion and an introduction connecting portion are in a volute type, low-temperature gas enters the mixing portion at a certain speed in a volute type tangential manner, a low-temperature rotational flow air film is formed in the area, close to the wall face, in the mixing portion, the pipe center area of the mixing portion is wrapped with high-temperature furnace smoke, the high-temperature furnace smoke is prevented from making direct contact with the wall face of the mixing portion, and the problems of mixing portion coking and cracking troubling safe and stable running of a brown coal power plant for a long time are solved; meanwhile, due to the fact that the introduction connecting portion is arranged at the position close to a hearth smoke pumping opening, a small amount of low-temperature gas is diffused to a hearth from the hearth smoke pumping opening in a rotational flow manner, the low-temperature rotational flow gas film is formed on the area of the wall face of the hearth smoke pumping opening, and therefore the problem of coking of the hearth smoke pumping opening is solved.

Description

technical field [0001] The invention relates to a furnace smoke mixing chamber, in particular to a mixing chamber at the furnace smoke outlet of a lignite boiler of a furnace smoke drying fan coal pulverization system. Background technique [0002] Due to the characteristics of lignite, which is difficult to dry due to its high moisture content and high volatile content, which is prone to spontaneous combustion and explosion, most lignite-fired power plant boilers use three-medium (high-temperature furnace smoke, low-temperature furnace smoke and hot air) or two-medium (high-temperature furnace smoke and hot air) drying fans to grind coal. Machine direct blown powder making system. [0003] The high-temperature fume is extracted from the upper part of the boiler furnace where the temperature is about 1100°C. The furnace smoke outlet is generally arranged near the furnace flue gas outlet, while the low-temperature fume with a smoke temperature of about 130°C is drawn from the...

AI Technical Summary

Problems solved by technology

[0010] It can be seen that none of the existing measures can effectively solve the problem of coking in the mixing chamber of lignite boilers and the smoke outlet of the furnace, as well as the problem of cracking caused by the uneven cooling and heating of the metal wall surface of the mixing chamber pipe section.

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