Tangential circular intake furnace smoke mixing chamber and lignite boiler including it

Abstract

The invention provides a tangent circle gas inlet furnace smoke mixing chamber and a lignite boiler comprising the same. Due to the fact that a plurality of leading-in connection parts communicate with the outer wall of a mixing part in a tangency mode, low-temperature gas enters the mixing part tangentially at a certain speed and forms a low-temperature rotational flow gas film in the area, close to the wall face, in the mixing part, and low-temperature furnace smoke is coated in a pipe central area of the mixing part, so that the phenomenon that the low-temperature furnace smoke makes contact with the wall face of the mixing part directly is avoided, and thus the problems of coking of the mixing part and tension fracture troubling safe and stable operation of a lignite-fired power plant for a long time are solved. Meanwhile, due to the fact that the positions of the leading-in connection parts are close to a furnace chamber smoking exhausting opening, a small part of low-temperature gas diffuses into a furnace chamber from the furnace chamber smoking exhausting opening in a rotational flow mode to form a low-temperature rotational flow gas film in the area of the wall face of the furnace chamber smoking exhausting opening, and thus the problem of coking of the furnace chamber smoking exhausting opening is also 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.

Images