Self-balancing throughflow type material returning device

Abstract

A self-balancing through-flow charge returner is provided, which comprises a stage-I loosening plenum, a stage-I loosening nozzle button, a material-falling pipe, an adjusting section, a stage-II loosening air hose, an ash releasing pipe, a spile valve, a horizontal conveying section, an outlet section and a stage-II loosening plenum. The invention is basically characterized in that, two stages of loosening air are provided, the stage-I loosening air is at the adjusting section and inside the central line of the material-falling pipe; air is distributed by a cylindrical (not oriented) nozzle button or an oriented nozzle button; the stage-II loosening air hose is like a flute, passes into the returner from the side of the adjusting section, is located above the ash releasing pipe; the two stages of loosening air distribute air independently, the air pressure of the stage-II loosening air is higher than that of the state-I loosening air. The returner is additionally characterized in that, the included angle between the bottom plate of the adjusting section and the level is 0-15 degree; the through-flow area of the horizontal conveying section is 1/2-1 of the through-flow area of the material-falling pipe; the outlet section is a round or square pipe, the diameter is bigger than that of the material-falling pipe; the outlet section uses a baffle to stop the influence of air flow. The invention is controllable and self balancing, can not only prevent back flowing of air flow in the furnace tank, but also can adjust the flow of solid material, also can solve the instantaneous choking due to small slag by releasing material timely, and is applicable for returning solid particles of circulating fluid bed.

Description

technical field [0001] The invention relates to a self-balancing through-flow return device, which belongs to the technical field of mechanical engineering. Background technique [0002] The material return device is one of the three main components of the circulating fluidized bed boiler and an essential part of the circulating fluidized bed circuit. Commonly used controllable non-mechanical valves include L valve, V valve, U valve, etc., which have the characteristics of simple structure, adjustability and controllability; flow valves include airtight delivery valves, flow sealing valves, N valves and multi-point delivery valves. Dampers, etc., can automatically balance the flow of solid particles according to their own pressure balance relationship, but the amount of air inflated has little effect on the regulation of the flow of solid particles. [0003] Retrieving patents related to circulating fluidized bed material return device also found that in order to better reg...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a self-balancing through-flow return device, which can prevent the furnace airflow from reversing, and can also adjust the solid material flow in a self-balancing manner, and can also solve the problem of instantaneous small slag clogging by timely discharging

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