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Boiler furnace of circulating fluidized bed with water-cooled column

A circulating fluidized bed and boiler furnace technology, which is applied to fluidized bed combustion equipment, fuel burning in a molten state, lighting and heating equipment, etc., can solve the effect of furnace material circulation, furnace material concentration, temperature distribution and heat transfer uniformity. It can improve hydrodynamic safety, uniform heating, and reduce NOx emissions.

Active Publication Date: 2008-06-11
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, because the existing technology separates the furnace bed surface, and some also have a heating surface that separates the upper space of the furnace, the material circulation of the furnace is greatly affected, resulting in material concentration, temperature distribution and The uniformity of heat transfer becomes poor

Method used

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  • Boiler furnace of circulating fluidized bed with water-cooled column
  • Boiler furnace of circulating fluidized bed with water-cooled column

Examples

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Effect test

Embodiment 1

[0021] Referring to Fig. 1, Fig. 2 and Fig. 3, the furnace 10 of the circulating fluidized bed boiler with water-cooled columns of the present invention comprises a furnace front wall 11, a rear wall 13, two side walls 12, a ceiling 14 and an air distribution plate 15, and the two side walls Cyclone separators 20 are arranged symmetrically on the outside, and the rear side of the rear wall is a tail flue 30 .

[0022] Between the furnace air distribution plate 15 and the ceiling 14, two vertical water-cooling columns 100 are arranged along the center line of the depth of the furnace 10 (perpendicular to the direction of the front and rear walls of the furnace), and the water-cooling columns 100 are surrounded by membrane walls 1 of square columns without top and bottom faces. The position corresponding to the top of the water-cooling column 100 on the ceiling 14 and the position corresponding to the bottom of the water-cooling column 100 on the air distribution plate 15 are op...

Embodiment 2

[0026] Referring to Fig. 1 and Fig. 4, the circulating fluidized bed boiler furnace 10 with water-cooled column of the present invention comprises furnace front wall 11, rear wall 13, side walls 12, ceiling 14 and air distribution plate 15, rear wall 13 and tail smoke Cyclone separators 20 are arranged between the channels 30 .

[0027] A vertical water-cooling column 100 is arranged between the furnace air distribution plate 15 and the ceiling 14. The water-cooling column 100 is surrounded by a membrane wall, and the cross-sectional shape is oblong, and the two semicircles face the front wall and the rear of the furnace respectively. wall. The water-cooled column-membrane wall tube has a working fluid from bottom to top. The outer side of the water cooling column faces the combustion space of the furnace. In order to ensure the same heating condition between the water cooling column and the water cooling wall of the furnace, refractory materials with the same height as the ...

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Abstract

The invention relates to a circulating fluid bed boiler furnace with water-cooled posts, which is characterized in that: the water-cooled posts arranged in the boiler furnace are able to provide enough heating area; meanwhile, enough space is left between posts for mixing materials at lower section of the boiler furnace, so as to ensure the concentration, temperature and the evenness of heat transfer; the heating status of the heat face of the water-cooled posts and the wall around the boiler furnace are similar, which is particularly beneficial for enhancing the hydrodynamic force safety of supercritical circulating fluidized bed boiler furnace. The water-cooled posts are able to be internally provided with dusts being able to through with secondary winds at the central area of the boiler furnace. The invention arranges the vertical water-cooled posts encircled by film walls between boiler furnace grid plate and a ceiling and working substance are provided from up to down in the film wall pipe; the external side of the water-cooled post faces to the burning space of the boiler furnace.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a circulating fluidized bed boiler furnace with extended heating surface. Background technique [0002] With the expansion of boiler capacity, more heating surfaces need to be arranged in the furnace of circulating fluidized bed boilers to maintain a reasonable bed temperature and flue gas temperature at the furnace outlet. At the same time, the larger the boiler capacity, the larger the cross-sectional area of ​​the furnace, and the difficulty for the secondary air to penetrate the furnace also increases, and the center of the furnace is prone to form an oxygen-deficient area. In order to solve this problem, in large boilers, especially supercritical boilers, the existing technology generally adopts the method of setting partitions at the lower part of the furnace to divide the bed surface into two or more parts, and the partitions are provided with tuyeres. Secondary air i...

Claims

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Application Information

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IPC IPC(8): F23C10/18
Inventor 吕清刚孙运凯包绍麟宋国良高鸣那永洁王东宇贠小银
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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