Air preheater and quartered-bin ventilation method thereof

Abstract

The invention discloses a quartered-bin ventilation method of an air preheater. The ventilation method comprises the steps that flue gas is made to pass through a flue gas bin of the air preheater inthe first direction; primary air is made to pass through a primary air bin of the air preheater in the second direction, and the primary air bin is adjacent to the flue gas bin; secondary air is madeto pass through a secondary air bin of the air preheater in the second direction, and the secondary air bin is adjacent to the primary air bin; and hot primary air exhausted from an outlet of the primary air bin is guided into a hot primary air bin, the hot primary air is made to pass through the hot primary air bin in the second direction, and the hot primary air bin is adjacent to the flue gas bin and the secondary air bin. According to the quartered-bin ventilation method, the hot primary air at the outlet of the primary air bin is guided into the hot primary air bin, the temperature of theinterior of the secondary air bin can be obviously increased, the temperature of metal partition plates is increased, accordingly, low-temperature corrosion of the air preheater is relieved, and theair preheater is prevented from being blocked by ash. The invention further provides the air preheater, the quartered-bin ventilation method is applied to the air preheater, and ash blocking can be avoided.

Description

Technical field [0001] The invention relates to the technical field of mechanical industry, and more specifically, to a four-division bin ventilation method of an air preheater, and also to an air preheater. Background technique [0002] The air preheater of a coal-fired boiler can use flue gas to heat the space. In the air preheater, the air and flue gas flow in opposite directions, and the cold end of the air preheater is provided with flue gas outlet and air inlet. [0003] Due to the low air temperature at the cold end of the air preheater, the wall temperature of the metal partition used to separate the flue gas channel and the air channel in the air preheater is low, resulting in serious low-temperature corrosion at the metal partition and easy to form ash clogging . [0004] In summary, how to reduce the low-temperature corrosion of the air preheater to prevent ash clogging of the air preheater is a technical problem to be solved urgently by those skilled in the art. Summary...

AI Technical Summary

Problems solved by technology

[0003] Due to the low air temperature at the cold end of the air preheater, the wall temperature of the metal partition used to separate the flue gas channel and the air channel in the air preheater is low, resulting in serious low-temperature corrosion on the metal partition and easy formation of dust blocking

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