Taper tube and ash returning pump and ash recombustion type circulated fluid bed combustion equipment

Abstract

The invention discloses a gradually contracting and expanding pipe, an ash returning pump and a fly ash re-burning circulating fluidized bed combustion apparatus. The pipe is constituted by a gradually contracting pipe section and a gradually expanding pipe section, the small end diameters of two cut conical inner surfaces are the same and are axially butt-jointed, and the bore cone angle of the gradually contracting pipe section is larger than the cone angle of the gradually expanding pipe section. The ash returning pump comprises the gradually contracting and expanding pipes, a mixing chamber, a holdfast, a movable injection pipe, a fixed cavity and a vent pipe, and the fly ash re-burning circulating fluidized bed combustion apparatus comprises the ash return pump, a burner, a dust cleaner and a fan, wherein the upper end of the dust cleaner is communicated with the vent pipe of the ash return pump, the lower end is communicated with an ash inlet which is arranged on the upper end of the mixing chamber, the fan is communicated with the vent pipe of the ash return pump, and the gradually contracting section on the discharge end of the gradually contracting and expanding pipe is communicated with the dense phase region of the burner through a fly ash pipe. The invention has the advantages of simple structure, excellent spraying effect and favorable economic and social benefits, which can guarantee continuous, even and stable transferring of fly ash.

Description

1. Technical field: [0001] The invention relates to a fly ash reburning combustion device and a pneumatic conveyer, in particular to a tapered and expanded pipe, an ash return pump and a fly ash reburning circulating fluidized bed combustion equipment. 2. Background technology: [0002] The dominant coal resources in my country's energy structure are very rich, but low-volatile anthracite and high-ash and high-sulfur low-quality coal occupy a considerable proportion and are widely distributed. Fully and rationally utilizing this part of coal resources will have significant economic benefits and social benefits. [0003] Circulating fluidized bed boiler is a high-efficiency, low-pollution and clean combustion technology developed in the past ten years. It has the advantages of strong adaptability to coal types and large load regulation ratio, and has been widely promoted and applied. However, the content of fly ash combustibles in the operation of CFB boilers has also attract...

AI Technical Summary

Problems solved by technology

Its main invention is the return controller to control the flow of fly ash. Its conveying device adopts ordinary pneumatic conveying injector, which is a common equipment.

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