Boiler induced-draft fan soot blower

Abstract

The invention discloses a boiler induced-draft fan soot blower which is composed of an air inlet (1), air distribution pipes (2), an air outlet pipe (3), a nozzle pipe (4), a nozzle (5) and a supporting frame (6). The air distribution pipes (2) are ring-shaped and are arranged on a round contracted port of a current collector (8), the air nozzle pipes (4) are arranged symmetrically, the nozzle (5) is a gradually-contracted nozzle and is installed with an outlet (41) through threads in a matched mode, and the supporting frame (6) is fixedly connected with the nozzle pipe (4) through bolts (42) to play the role in fixing the nozzle pipe (4). The boiler induced-draft fan soot blower blows air to remove dust in the radial direction from the center of the impeller of the induced draft fan, counter-acting force of air flow inside the nozzle are mutually cancelled, and under the fixing function of the supporting frame, stability and effectiveness of working of the soot blower are ensured. The boiler induced-draft fan soot blower can use air or steam to carry out dust blowing, is simple in part structure, and convenient to process and produce and assemble in batch.

Description

technical field [0001] The invention relates to a boiler induced draft fan device, in particular to a boiler induced draft fan soot blowing device. Background technique [0002] The boiler induced draft fan is one of the necessary equipment to ensure the normal operation of the boiler. Once the induced draft fan stops running, it will directly affect the normal operation and output of the boiler. Therefore, ensuring the normal operation of the boiler induced draft fan is one of the necessary conditions to ensure the normal operation of the boiler. At present An important factor affecting the normal operation of the induced draft fan of the boiler is the vibration problem caused by the dust accumulation on the blades of the induced draft fan. [0003] Boiler flue gas contains water vapor, sulfide and dust not completely removed by the dust collector. These substances condense and mix with dust to form mortar, which easily adheres to the blades of the induced draft fan, and mo...

AI Technical Summary

Problems solved by technology

[0003] Boiler flue gas contains water vapor, sulfide and dust not completely removed by the dust collector. These substances condense and mix with dust to form mortar, which easily adheres to the blades of the induced draft fan, and most of them are bonded to the blades of the induced draft fan. On the non-working surface and the front and rear plates of the impeller, after the water evaporates, a relatively hard ash shell is formed and gradually deposits and thickens. When the ash deposit reaches a certain quality, part of the ash will fall off under the combined action of its own weight and rotating centrifugal force, and the fan rotor will The balance is destroyed and vibration is generated. When the vibration exceeds the specified value, it is necessary to stop the machine for manual cleaning, which will cause the boiler to be forced to press the fire to stop the furnace. Corner bolts loosened causing serious damage to equipment

[0004] If the induced draft fan is frequently stopped to clean up the dust accumulation, it will greatly affect the safe operation of the boiler and the stability of production. The soot on the blades can be removed by just pressing down on the blades; at present, the soot blowing method of these soot blowing devices is that the blowing nozzle is external, and the air is blown from the outside of the blades to the axis of the impeller. The effect of this soot blowing method is not ideal and cannot Fundamentally solve the problem of fan vibration caused by dust accumulation on the blades; the utility model patent boiler induced draft fan soot blowing device (ZL200920140941.X) has designed a device that blows air from the center of the impeller along the radial direction, and its disadvantage is that it is only designed A blowing pipe extends from the air inlet direction of the fan impeller to the center of the fan impeller. Due to asymmetry during blowing, the pressure in the induced draft fan will be unbalanced, causing the induced draft fan to vibrate, especially when the soot blowing airflow is large. The pressure imbalance in the induced draft fan is more obvious. At the same time, a blowing pipe is not easy to fix. Under the reaction force of the air flow in the nozzle, it is difficult to ensure that the distance between the nozzle on the blowing pipe and the impeller of the induced draft fan is constant.

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