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

A technology of tapering and expanding and tapering pipes is applied in the field of fly ash reburning circulating fluidized bed combustion equipment, which can solve the problems of poor injection effect, large maintenance amount, ash leakage, etc., and achieve good injection effect and cost. Low and high stress

Inactive Publication Date: 2008-05-28
巩义市泰华机械厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its main invention is the return controller to control the flow of fly ash. Its co...

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment one: see figure 1 And Fig. 2, among the figure, the burner 1 of fly ash reburning type circulating fluidized bed combustion equipment is provided with refueling device (not shown in the figure, is prior art), ignition device 9, primary air chamber 10, secondary Air inlet 11 and tertiary air inlet 12, the burner 1 is a circulating fluidized bed boiler, the upper end of the dust collector 2 communicates with the exhaust gas outlet of the burner 1, and the lower end passes through the transition chamber 3 and the mixing chamber 18 of the ash return pump 8 The ash inlet 19 provided at the upper end is connected, the Roots blower 6 is connected with the ventilation pipe 13 of the ash return pump 8, and the tapered and expanded pipe 22 of the ash return pump 8 is connected at the discharge end through the fly ash pipe and the burner 1. The dense phase region is connected. The pipe section connecting the fly ash pipe to the burner 1 is inclined downward, and its ho...

Embodiment 2

[0034] Embodiment 2: This embodiment is basically the same as Embodiment 1, and the similarities will not be repeated. The difference is that the reducer pipe section 21 and the expander pipe section 23 are split combined structures, and the reducer pipe section 21 and the expander pipe section 23 are respectively processed by turning and / or grinding of the pipe body, and the contacting ends of the two are fitted together and fixed by welding or flanged or bolted, which is convenient for processing and low in cost.

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Abstract

The invention discloses a reducing and increasing pipe and an ash returning pump and a fly ash re-burning circulating fluidized bed combustion apparatus. The pipe is constituted by a reducing pipe section and an increasing pipe section, the small end diameters of two frusto-conical inner surfaces are same and are axially butt-jointed, and the bore cone angle of the reducing pipe section is larger than the cone angle of the increasing pipe. The ash returning pump comprises the reducing and increasing pipe, a mixture 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 mixture chamber, the fan is communicated with the vent pipe of the ash return pump, and the reducing pipe section on the discharge end of the reducing and increasing 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 the continuous, even and stable fly ash transfer.

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...

Claims

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Application Information

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IPC IPC(8): F23C9/06
Inventor 董跃祥
Owner 巩义市泰华机械厂
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