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CFB (circulating fluidized bed) waste incineration boiler gas-solid separation method

A technology for waste incineration and boiler gas, applied in separation methods, combustion methods, incinerators, etc., can solve the problems of large content of particulate matter in flue gas, inability to dispose of and comprehensive utilization, and shorten the continuous operation cycle of boilers.

Inactive Publication Date: 2015-04-22
CHINA WESTERN POWER INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is precisely this combustion method that requires the fluidized wind to lift the garbage from the bottom of the furnace and suspend it in the furnace to be heated and exposed to the air in a 360° direction, so the particulate matter content in the flue gas is relatively large.
As we all know, the fly ash of waste incineration boilers is a hazardous waste clearly stipulated in the national standards and cannot be disposed of and comprehensively utilized at will; at the same time, a higher concentration of fly ash will increase the frequency of ash accumulation and bridging at the convective heating surface at the tail, shortening the boiler Continuous operation cycle reduces waste incineration power plant efficiency

Method used

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  • CFB (circulating fluidized bed) waste incineration boiler gas-solid separation method
  • CFB (circulating fluidized bed) waste incineration boiler gas-solid separation method

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Embodiment Construction

[0011] Below in conjunction with accompanying drawing, the present invention is described in detail.

[0012] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0013] The solid particles in the furnace can be divided into three categories according to the particle size: large, medium and small. The present invention limits the particulate matter content in the flue gas through several steps.

[0014] 1. Set the cross-sectional fluidization velocity in the furnace to 4-4.5 m / s. The fluidization velocity determines the particle size of the material leaving the furnace, and also determines the utilization efficiency of the metal on the heating surface of ...

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Abstract

The invention discloses a CFB (circulating fluidized bed) waste incineration boiler gas-solid separation method which is characterized by including the steps: 1 setting the fluidizing velocity of a section in a hearth to be 4-4.5 meters / second; 2 performing gas-solid separation for flue gas by a cyclone separator; 3 setting an empty flue behind the cyclone separator, and setting a 180-degree upward turn at the tail of the flue. High circulating ash concentration and efficient heat transfer in the boiler are ensured, tail fly ash quantity is decreased, fly ash particle sizes are effectively controlled within a proper range, and abrasion of a tail convection heating surface is reduced.

Description

technical field [0001] The invention relates to a method for gas-solid separation of CFB waste incineration boiler flue gas and fly ash. Background technique [0002] The circulating fluidized bed boiler for waste incineration adopts the form of fluidized combustion, so that the waste is heated and exposed to air in a 360-degree direction in the furnace, and the combustion intensity is very intense, and it can be burned in just 2-3 seconds. , reflecting the obvious advantages of this combustion method. However, it is precisely this combustion method that requires fluidized wind to lift the garbage from the bottom of the furnace and suspend it in the furnace to receive heat and contact air in all directions in 360° directions, so the particulate matter content in the flue gas is relatively large. As we all know, the fly ash of waste incineration boilers is a hazardous waste clearly stipulated in the national standards and cannot be disposed of and comprehensively utilized at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G5/44F23C10/18B01D45/16
CPCF23G5/30F23G2203/50F23G2900/50214
Inventor 林雨蔡文钢龚俊
Owner CHINA WESTERN POWER INDAL
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