Boiler fine ash discharging and air-lock device suitable for negative pressure and high temperature working conditions

Abstract

A boiler fine ash discharging and air-lock device suitable for negative pressure and high temperature working conditions comprises a collection hopper, a valve and a feeding pipe, and is characterized in that the lower pipe orifice of the feeding pipe is connected with a through hole in the upper wall of an additionally-arranged air-lock tank in a sealing manner, and a discharge pipe is arranged on the lower wall of the air-lock tank; a rectangular beam is fixed on two side walls of the air-lock tank, and the upper surface of the rectangular beam is provided with a V-shaped slot; an L-shaped lever is additionally provided, a cone tip at the upper end part of a longitudinal rod of the L-shaped lever is supported on a hollow central cone top in a lower umbrella-shaped conical plate, and the upper conical surface of the lower umbrella-shaped conical plate is attached to the inner edge of the lower pipe orifice of the feeding pipe; an upper umbrella-shaped conical plate is fixed on the top of a longitudinal upright rod fixed on the top of the lower umbrella-shaped conical plate, and the outer diameter of the upper umbrella-shaped conical plate is less than the inner diameter of the feeding pipe; the triangle top edge of a middle fulcrum block of a transverse rod of the L-shaped lever is supported on the slot bottom of the V-shaped slot of the rectangular beam; and an annular weight is screwed on an external thread at the right end part of the transverse rod of the L-shaped lever. The boiler fine ash discharging and air-lock device has the advantages that the lower pipe orifice of the feeding pipe is opened and closed by means of the lever principle, and air is prevented from being sucked back to a boiler unit.

Description

Technical field: [0001] The invention relates to an ash discharge device, in particular to a fine ash discharge and air lock device for boilers suitable for negative pressure and high temperature working conditions. Background technique: [0002] The temperature of the fine ash at the ash outlet of the negative pressure boiler unit is as high as 500-1000°C. The structure of the existing ash discharge device is as follows: the collecting hopper is connected with the discharge pipe, a normally open valve is connected in series in the discharge pipe for shutdown during maintenance, and the lower nozzle of the discharge pipe is connected with a discharge cylinder. The blanking barrel is driven by a motor to rotate a turning hopper built in the barrel. The turning hopper is a bushing with four radial plates evenly distributed. When the motor is not rotating, the edges of the two radial plates are attached to the lower port of the feeding tube. The ashes are blocked and not disch...

AI Technical Summary

Problems solved by technology

[0003]The tipping hopper is long-term heat-transferred by high-temperature ash, and the heat is conducted to the motor shaft. The motor is in a high-temperature state for a long time, which affects the operation and life of the motor. After operating the motor to turn over and empty the ash, the air is easily sucked into the boiler unit due to the lack of material level in the ash lowering pipe, resulting in secondary combustion and coking in the furnace, resulting in poor ash discharge at the ash discharge port, and the emptying time cannot be grasped

At present, many ash discharge air lockers are used, which mainly have the defects of temperature resistance, sealing, unstable material level of the ash lowering pipe and insufficient automatic performance, which cannot meet the requirements of temperature resistance, automatic ash lowering and air lock, and affect the performance of the ash discharge device. Long-term stable operation

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