Pure combustion high sodium coal two-stage medium temperature separation circulating fluidized bed saturated steam boiler

Abstract

The invention discloses a pure combustion high sodium coal two-stage medium temperature separation circulating fluidized bed saturated steam boiler. The circulating fluidized bed saturated steam boiler comprises a hearth, wherein the lower portion of the hearth communicates with a uniform pressure wind chamber through a small wind cap wind distribution plate, and a feed pipe, a buried pipe and a material return opening are arranged at the lower portion of the hearth; an outlet of the hearth turns downwards and is connected with a first water cooling cavity, the lower portion of the first watercooling cavity gradually shrinks, turns downwards and then increases, the lower portion of the first water cooling cavity is connected with a first-stage accelerated sedimentation separator, the lower portion of the first-stage accelerated sedimentation separator is connected with a subsider, and the bottom of the subsider is connected with the material return opening; and the upper portion of the first-stage accelerated sedimentation separator is connected with a second water cooling cavity, a membrane type wall water cooling shield is arranged at the upper portion of the second water cooling cavity, and an outlet of the second water cooling cavity is connected with a second-stage volute cyclone separator in series. The outlet of the hearth is provided with the first water cooling membrane type wall cavity and the second water cooling membrane type wall cavity, the contamination reduction design and sodium and potassium high temperature corrosion avoidance are carried out on a heating surface which is most prone to being polluted, the phenomena of serious coking and ash deposition are eliminated, and good effects are achieved.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a two-stage middle-temperature separation circulating fluidized bed saturated steam boiler purely burning high-sodium coal, which belongs to the technical field of boiler combustion equipment. Background technique [0002] At present, circulating fluidized bed boilers generally have poor adaptability to high-sodium coal in the Zhundong area of ​​Xinjiang. The boilers that have been in operation generally burn part of high-sodium coal, and generally have serious coking and ash accumulation, and high-temperature corrosion of sodium and potassium, resulting in boiler failure and exhaust Smoke temperature is high. The characteristics of Zhundong high-sodium coal are: low ash, low sulfur, low melting point of medium ash, high water content, high volatile content, medium and high calorific value, high sodium, potassium, calcium, strong coking, strong staining, but fire Excellent b...

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Problems solved by technology

[0002] At present, circulating fluidized bed boilers generally have poor adaptability to high-sodium coal in the Zhundong region of Xinjiang. The boilers that have been in operation generally burn part of high-sodium coal, and generally have serious coking and ash accumulation, and high-temperature corrosion of sodium and potassium, resulting in boiler failure and exhaust high smoke temperature

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