Cooling type clapboard for U-shaped stuff back-feeder

Abstract

The invention discloses a cooling type clapboard for a U-shaped stuff back-feeder, and relates to technology of a solid material back feeding device. The clapboard comprises an intermediate clapboard vertically arranged between a descending pipe and an ascending pipe of the U-shaped stuff back-feeder and a stuff back feeding clapboard vertically arranged between the ascending pipe and a refeed pipe; wherein the intermediate clapboard and the stuff back feeding clapboard comprise a cooling pipe bundle and a refractory abrasive-resistant material coated outside the cooling pipe; at least one end of the cooling pipe bundle penetrates the shell of the stuff back-feeder, and is communicated with a header which is arranged outside the shell of the stuff back-feeder; a cool working substance is introduced into the cooling pipe. The cooling type clapboard for the U-shaped stuff back-feeder has simple structure and smooth process of the working substance, ensures that the intermediate clapboard and the stuff back-feeder of the U-shaped stuff back-feeder can be cooled, prolongs service life of the clapboard, and ensures long-term safe and stable operation of the stuff back-feeder.

Description

technical field [0001] The invention relates to the technical field of solid material return devices, in particular to a separator for a return device of a circulating fluidized bed. Background technique [0002] In the material circulation circuit of the circulating fluidized bed, the feeder plays a very critical role. The common forms of feeder are: L-shaped feeder, J-shaped feeder, sealed delivery tank, U-shaped feeder, etc. At present, the most common one is the U-shaped feeder. [0003] According to whether the wall surface is cooled or not, the feeder can be divided into two types: cooling type and adiabatic type. The more commonly used one is the adiabatic type without cooling. However, in the circulation loop of high-temperature materials, such as circulating fluidized bed boilers, circulating fluidized bed incinerators and other equipment, high temperature brings two major challenges to the commonly used adiabatic return feeder: one is that unburned carbon is easy ...

AI Technical Summary

Problems solved by technology

[0005] However, the existing water-cooled U-shaped feeder usually adopts a water-cooled film wall for the outer shell, and the middle partition between the downcomer and the riser and the return partition between the riser and the return pipe are not It is built with refractory materials, which makes the expansion coefficients of the partition and the shell different, especially when the equipment starts and stops, there is a gap between the two. If the circulating ash enters the gap, the partition is easily damaged.

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