A coal gangue circulating fluidized bed boiler

A technology of circulating fluidized bed and coal gangue, which is applied in the direction of fluidized bed combustion equipment, burning fuel in molten state, lighting and heating equipment, etc., which can solve the problem of inability to guarantee the bed temperature, affect the stable operation of the boiler, and inexhaustible fuel combustion and other problems, to achieve the effect of preventing short circuit of flue gas and reverse flow of return air, prolonging residence time and stabilizing fuel combustion

Inactive Publication Date: 2015-10-14
CHINA COAL ENERGY HEILONGJIANG COAL CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing coal gangue circulating fluidized bed boiler fuel has a high ash melting point, unstable combustion, and inexhaustible fuel combustion, and the current use of water-cooled and steam-cooled cyclone separators can not guarantee the bed temperature. And the return device adopts the natural circulation of primary air, which affects the stable operation of the boiler, and then provides a coal gangue circulating fluidized bed boiler

Method used

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  • A coal gangue circulating fluidized bed boiler
  • A coal gangue circulating fluidized bed boiler
  • A coal gangue circulating fluidized bed boiler

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specific Embodiment approach 1

[0008] Specific implementation mode one: combine Figure 1 ~ Figure 3 Explain that a coal gangue circulating fluidized bed boiler in this embodiment includes a furnace 1, a water-cooled air chamber 2, a cyclone separator 3, a feeding device 4 and a feeding Roots blower 5, and the lower end of the feeding device 4 is communicated with a The return Roots blower 5 and the water-cooled air chamber 2 are fixedly connected to the lower end of the furnace 1, and the upper side wall of the furnace 1 is connected with a cyclone separator 3, and the cyclone separator 3 includes a separator main body 3-1 and a flue gas outlet cylinder 3 -2, the outer wall of the separator main body 3-1 is provided with thermal insulation rock wool 3-3, and the inner wall of the separator main body 3-1 is successively provided with aluminum silicate thermal insulation cotton board 3-4 and thermal insulation castable layer 3-5 and the wear-resistant castable layer 3-6, the flue gas outlet cylinder 3-2 of t...

specific Embodiment approach 2

[0009] Specific implementation mode two: combination figure 2 To illustrate, the flue gas outlet tube 3-2 of the cyclone separator 3 in this embodiment is rolled from wear-resistant and heat-resistant steel plates. Such design improves the quality of the cyclone separator and ensures the stable and reliable operation of the cyclone separator. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0010] Specific implementation mode three: combination figure 2 To illustrate, the inner diameter D of the flue gas outlet cylinder 3-2 in this embodiment is 2.3-3.0 m. This design ensures smooth flow of flue gas. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a coal gangue circulating fluidized bed boiler, and relates to a circulating fluidized bed boiler which can be used for solving the problems that existing coal gangue circulating fluidized bed boiler is higher in ash fusion point of fuel, unstable in fuel and inadequate in fuel combustion, the bed layer temperature cannot be ensured due to water cooling and gas cooling cyclone separators adopted, and the return device uses natural circulation by primary air which affects stable operation of the boiler. The boiler comprises a hearth, a water cooling air chamber, a cyclone separator, a return device and a return Roots blower, wherein the cyclone separator is communicated to the upper side wall of the hearth, insulating rock wool is arranged on the outer wall of a separator main body, an aluminum silicate insulating cotton plate, an insulating pouring material layer and a wear-resisting pouring material layer are sequentially arranged on the inner wall of the separator main body, an exhaust gas outlet cylinder of the cyclone separator is fixedly connected to an upper outlet of the separator main body in a deviating manner, and the lower end of the cyclone separator is communicated with the lower side wall of the hearth through the return device. The boiler provided by the invention is used for combusting coal gangue fuel.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler. Background technique [0002] The coal is mainly coal gangue (accounting for about 74%), mixed with long-flame coal (accounting for about 26%), the calorific value of the blended coal is about 1500Kcal / kg, and the ash content is about 65%, which belongs to low calorific value, high ash content, large particles and How to ensure stable combustion and burnout of high-hardness fuels is the main problem. For coal gangue circulating fluidized bed boilers, the fuel is a fuel with low calorific value, high ash content, large particles and high hardness, which has the problems of high ash melting point, unstable combustion, and inexhaustible combustion. The boiler adopts a water-cooled and steam-cooled cyclone separator, and the secondary combustion in the cyclone separator plays a cooling role, so it has an adverse effect on the burnout of coal gangue. At the same time, the calorific value of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/10F23C10/18F23C10/26
Inventor 孟国勋周志远刘蓉华牛玉梅刘青国许甲文盛天雷刘跃曲建鹿王宏宇
Owner CHINA COAL ENERGY HEILONGJIANG COAL CHEM
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