Novel accumulated dust blowing device of sector plate of boiler air pre-heater

Abstract

The invention discloses a novel accumulated dust blowing device of a sector plate of a boiler air pre-heater. The novel accumulated dust blowing device comprises a pre-heater body, a secondary air side opening, a top cover, a center hole, a flue gas side opening, a primary air side opening, a main pipe, branch pipes, valves, a primary air inlet, a shaft hole, the sector plate, dust blowing spray heads, a rotor, a heat transfer element and a rotor center barrel. The main pipe is mounted to be connected to the upper portion of the sector plate from the lower portion of a primary air bin, carbonsteel pipelines are selected as branches and are directly communicated into the sector plate, connecting parts are all welded, and therefore the blowing device is formed; the corresponding valve is mounted on each branch, the air volume can be controlled conveniently, and labor force is reduced; meanwhile, the problem that the air leakage rate is increased due to accumulated dust in the running process is avoided, and the problem of dust accumulation of the sector plate is thoroughly solved; and modification is extremely simple and convenient, and production requirements are met.

Description

technical field [0001] The invention relates to the related fields of air preheater cleaning, in particular to a novel fan-shaped plate ash cleaning device for boiler air preheaters. Background technique [0002] There are two types of air preheaters widely used in power plant boilers: tubular and rotary. The air preheater transfers heat in a regenerative way. The flue gas and air alternately flow through the heating surface. Outdated, the heating surface releases the accumulated heat to the air, and fan-shaped plates are required to be installed in the preheater. The fan-shaped plate cannot be completely sealed. During the operation, the dust in the flue gas chamber and the primary air chamber will gradually accumulate in the fan-shaped plate, which will cause the weight of the fan-shaped plate to increase continuously, which will easily cause the LCS automatic lifting device to be stuck. [0003] Since the rotor of the air preheater is always in a rotating state during o...

AI Technical Summary

Problems solved by technology

[0002] There are two types of air preheaters widely used in power plant boilers: tubular and rotary. The air preheater transfers heat in a regenerative way. The flue gas and air alternately flow through the heating surface. Outdated, the heating surface releases the accumulated heat to the air, and fan-shaped plates are required to be installed in the preheater. The fan-shaped plate cannot be completely sealed, and the dust in the flue gas chamber and the primary air chamber will gradually accumulate in the fan-shaped plate during operation, resulting in the continuous increase in the weight of the fan-shaped plate, which may easily cause the LCS automatic lifting device to be stuck

[0003] Since the rotor of the air preheater is always in a rotating state during operation, it is impossible to clean the dust accumulation in the fan-shaped plate. At present, when the unit is out of operation, the fan-shaped plate is opened to clean the dust, because the dust accumulation in the fan-shaped plate is more Seriously, so every time the unit stops running, it takes a lot of manpower to clean the fan-shaped plates, which takes a long time. At the same time, because the fan-shaped plates are always moving during the operation of the unit, excessive dust accumulation is easy As a result, the LCS lifting device cannot pull the fan-shaped plate. In order to avoid the excessive current of the preheater caused by the fan-shaped plate and the rotor jamming, it can only be manually lifted to the highest position to increase the air leakage rate.

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