Circulating fluidized bed boiler and flow state reconstruction method suitable for high-viscosity flue gas

Abstract

The invention discloses a circulating fluidized bed boiler and a flow state reconstruction method suitable for high-viscosity flue gas, and solves the problem that flow state reconstruction is neededwhen a circulating fluidized bed boiler uses coal ultra-high in alkali metal content as fuel. A superheated screen (8) is arranged in a hearth (6), a convection evaporation tube bundle (12) is arranged on the upper portion of a tail shaft flue (13), the convection evaporation tube bundle adopts a longitudinal sequence pipe bundle distribution form and communicates with a boiler barrel (10) througha water guide pipe, the boiler barrel communicates with the superheated screen through another water guide pipe, a high-temperature cyclone separator (14) is arranged on one side of the hearth, and the diameter of an upper barrel body of the high-temperature cyclone separator is 5-7 meters, and a center barrel (11) on the upper portion of the high-temperature cyclone separator is offset from thehigh-temperature cyclone separator; and the length-to-width ratio of the hearth is 1:2, and the shrinkage ratio of a fluidized bed at the lower part of the hearth is 0.45-0.5. Accumulated ash is effectively reduced, and the operation efficiency of the boiler is improved.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a circulating fluidized bed boiler using coal with ultra-high alkali metal content and low ash content as fuel and a flow state reconstruction method thereof. Background technique [0002] Circulating fluidized bed boilers in thermal power plants use coal as fuel, and the characteristics of coal combustion directly affect the normal operation of the boiler. ; Although the characteristics of various coals are slightly different, the existing equipment can basically meet their requirements; the temperature of the coal-fired flame in the furnace is generally 950 ° C, or even above 1000 ° C, and the ash particles produced by coal combustion form a circulating flow chemicalized materials. [0003] The Zhundong Coalfield is one of the super coalfields with huge reserves in China. The coal storage capacity is as high as 390 billion tons, accounting for about 7%-8% of the national c...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a circulating fluidized bed boiler and a fluid state reconstruction method suitable for high-viscosity flue gas, and solves the need for fluid state reconstruction when the circulating fluidized bed boiler uses coal with an ultra-high alkali metal content as fuel question

Images