Rotary air preheater and method for reducing air leakage and preventing blocking of primary air side

Abstract

The invention discloses a rotary air preheater and a method for reducing air leakage and preventing blocking of a primary air side. The rotary air preheater comprises a cavity and a rotor. The interior of the cavity is partitioned into a smoke bin, a primary air bin and a secondary air bin. A fan-shaped partition plate is arranged at the bottom of the primary air bin. A heating separation bin is partitioned out of the primary air bin through the fan-shaped partition plate. An air inlet of the heating separation bin is connected with a smoke inlet air duct. Smoke of the heating separation bin is used for heating heat exchange elements which are rotated out of other portions of the primary air bin and are to be rotated into the smoke bin. The method provided by the invention comprises the step that the heat exchange elements which are rotated out of the heating separation bin are heated by means of the smoke higher than 300 DEG C. According to the technical scheme, the heating separationbin is arranged in the primary air bin, a medium in the heating separation bin is the smoke, all air leaked from the primary air side enters the heating separation bin, the smoke is leaked into the heating separation bin, the problem of air leakage of the primary air side of the rotary air preheater can be thoroughly solved, and the air leakage rate of the rotary air preheater can be decreased substantially.

Description

technical field [0001] The invention relates to the technical field of heating, in particular to a rotary air preheater and a method for reducing air leakage and preventing blockage on the primary air side. Background technique [0002] The air preheater is the heating surface where the flue gas in the flue at the tail of the boiler preheats the air before entering the boiler to a certain temperature through the internal cooling fins. It is a device used to improve the heat exchange performance of the boiler and reduce energy consumption. Power plant boilers often use a rotary preheater with a heating surface. The application in the boiler is generally two compartments, three compartments, and four compartments. Among them, the four compartments are more commonly used in circulating fluidized bed boilers. [0003] The rotary air preheater will rotate slowly when it is working, the flue gas will enter the flue gas side of the air preheater and then be discharged, and the heat...

AI Technical Summary

Problems solved by technology

[0006] (1) The increase of the resistance of the air preheater seriously affects the safety of the unit operation, and the probability of non-stop occurrence of the unit is greatly increased;

[0007] (2) The increase of air preheater resistance leads to insufficient margin of induced draft fan and reduces the load capacity of the unit;

[0008] (3) The increase in the resistance of the air preheater leads to an increase in the power consumption of the primary fan, the blower fan and the induced draft fan;

[0009] (4) Dust blocking of air preheater leads to surface pollution of heat exchange elements and reduces heat transfer capacity of air preheater;

[0010] (5) The increase of the soot blowing frequency of the air preheater leads to serious blowing damage of the heat exchange element at the hot end of the air preheater;

[0011] (6) The cold end wall temperature of the air preheater is too low, resulting in low temperature corrosion of the heat exchange elements at the cold end of the air preheater;

[0012] (7) The water flushing of the air preheater causes serious damage to the heat exchange elements at the cold end of the air preheater, reducing the service life of the equipment

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