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

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...

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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

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