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Decarburization method of coal gangue and circulating fluidized bed mineral separating boiler

A circulating fluidized bed and coal gangue technology, applied in fluidized bed combustion equipment, combustion methods, steam boilers, etc., can solve the problems of high carbon content in ash and slag, achieve good activity, high calcination efficiency, and reduce production costs

Inactive Publication Date: 2014-10-15
HUNAN CHANGHONG BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the carbon content of the ash generated by the existing fluidized bed furnace after combustion is about 8%, and the carbon content of the generated slag is about 4%, and some fluidized bed furnace ash and slag have a higher carbon content.

Method used

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  • Decarburization method of coal gangue and circulating fluidized bed mineral separating boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] like figure 1 Shown: a circulating fluidized bed beneficiation boiler, including a furnace 4, a drum 9 is installed above the furnace 4; the bottom side of the furnace 4 is externally connected with a feeder 10 and an air inlet device 12 blowing toward the furnace; The feeder 10 leads to the fluidized bed combustion chamber 3 at the lower part of the furnace 4 through the pipeline; the water-cooled air chamber 2 and the slag discharge port 1 are arranged below the fluidized bed combustion chamber 3; the flue gas at the outlet of the furnace 4 rises and enters the cyclone separator 6. The flue gas at the outlet of the cyclone separator 6 rises and turns through the horizontal flue to the tail shaft flue; the shaft flue is provided with a tail heating surface 7 and a tail flue 11 in sequence; the cyclone separator 6 is arranged below the horizontal flue ; The lower outlet of the cyclone separator 6 is connected to the return channel 5; the beginning of the return channel ...

Embodiment 2

[0033] A coal gangue decarbonization method, comprising the following steps:

[0034] (1) Put the crushed and dried coal gangue in the fluidized bed combustion chamber 3 of the fluidized bed boiler for combustion. The high-temperature flue gas transfers heat to the furnace wall, and the heat transferred to the furnace wall increases the temperature of the furnace 4 to 850~950°C, so that the coal gangue can be fully burned and decarbonized; the oxygen source required for the coal gangue to fully burn is provided by the tail The air preheater in the heating surface 7 heats the wind in the natural state sent by the air inlet device 12 into hot air, and the hot air is divided into two parts and enters the air inlet device 12 and the water-cooled air chamber 2 to provide sufficient fuel for the coal gangue to fully burn. enough oxygen;

[0035](2) The high-temperature flue gas produced after coal gangue combustion is separated by the cyclone separator 6, and the vanadium in the co...

Embodiment 3

[0040] The difference between this embodiment and Embodiment 1 is that the feeder 10 is a belt feeder; the cyclone separator 6 is a water-cooled cyclone separator with material legs.

[0041] The water outlet pipeline of the drum 9 is connected to the water-cooled water inlet of the water-cooled cyclone separator with the material leg;

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Abstract

A decarburization method of coal gangue and a circulating fluidized bed mineral separating boiler. The decarburization method comprises the following steps: (1), crushed and dried coal gangue is placed in a fluidized bed combustor of a fluidized bed boiler to be combusted, heat is transferred to the boiler wall by high-temperature flue gas generated by the combustion of the coal gangue, so that the temperature of the boiler furnace is improved to 850 to 950 DEG C, and the coal gangue is combusted completely to be further decarburized; (2), the high-temperature flue gas generated by the combustion of the coal gangue is separated through a cyclone separator, so that vanadium in the coal gangue can be extracted by stage in the form of vanadium pentoxide according to the graded distribution of the furnace pressure of the fluidized bed; the invention further provides the fluidized bed mineral separating boiler. According to the invention, electricity generation, supply of heat, calcination and efficient and integrated mineral separation can be achieved, the coal gangue can be decarburized till 2% of residual carbon, and the heat efficiency of the fluidized bed mineral separating boiler is improved by 5% above.

Description

technical field [0001] The invention relates to a coal gangue decarbonization technology and a circulating fluidized bed boiler beneficiation technology, in particular to a coal gangue decarbonization method and a circulating fluidized bed beneficiation boiler. Background technique [0002] Circulating fluidized bed boiler technology is a high-efficiency, low-pollution and clean combustion technology that has developed rapidly in the past ten years. It can burn high-quality coal, low-quality coal, solid waste, biomass and other fuels, and is widely used in power generation, papermaking, building materials, Chemical, smelting and other industries. The calorific value of the coal used in the existing circulating fluidized bed boilers is above 2000kcal / kg. When the coal with this calorific value or solid particle fuel is used, the comprehensive carbon content of the ash generated after combustion is high, generally at 5 % or more; and the combustion thermal efficiency is low, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/10F23C10/18F22B31/08F22G7/12C04B7/24C04B7/38
CPCY02P40/10Y02P40/121
Inventor 曹希新夏卓林周跃兵
Owner HUNAN CHANGHONG BOILER
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