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Polygonal circulating fluidized bed boiler hearth

A circulating fluidized bed and boiler furnace technology, which is applied to fluidized bed combustion equipment, steam boilers, fuels burned in a molten state, etc., can solve the problems of large differences in heating conditions, uneven heat load, uneven flow, etc. problem, to achieve good thermal load uniformity, good flow uniformity, and reduce wear

Active Publication Date: 2012-01-25
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

[0004] In order to protect the water-cooled wall tubes at the upper and middle corners of the furnace, the Chinese utility model patent ZL200520112390.8 discloses a wear-resistant water-cooled wall for circulating fluidized bed boilers, and anti-wear columns are laid at the four corners of the furnace. The wear of the water-cooled wall tubes at the four corners of the furnace of the chemical bed boiler is greatly reduced, but the heating conditions of the water-cooled wall tubes laid with wear-resistant materials are quite different from those of other water-cooled wall tubes, resulting in uneven flow and uneven heat load. If Adoption in supercritical circulating fluidized bed boilers will have a great impact on the hydrodynamic design of the furnace

Method used

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  • Polygonal circulating fluidized bed boiler hearth
  • Polygonal circulating fluidized bed boiler hearth
  • Polygonal circulating fluidized bed boiler hearth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] like Figure 4 and Figure 5 In the polygonal circulating fluidized bed boiler furnace shown, the cross-section of the middle and upper part of the side wall is an octagon formed by chamfering each corner at 45°. Each side corresponds to a piece of membrane wall. The side wall of the furnace is Enclosed by these eight membrane walls, they are the front wall 1, the rear wall 2, the left wall 3, the right wall 4, and four membrane walls 13, 14, 23, 24. Among them, the four membrane walls 13, 14, 23, 24 forming an angle of 135° with the front wall 1, the rear wall 2, the left wall 3, and the right wall 4 are all composed of 7 water-cooled wall tubes 10 and inter-tube fins. 11, including two water-cooled wall tubes located at the vertex of the 135° angle, that is, two of the seven water-cooled wall tubes are shared with the adjacent two membrane walls.

[0019] According to the width and depth of the furnace, the membrane walls 13, 14, 23, 24 can be designed to be compos...

Embodiment 2

[0022] like Image 6 In the shown polygonal circulating fluidized bed boiler furnace, the cross-section of the middle and upper part of the side wall is hexagonal. Side wall 31, right front side wall 41 and left rear side wall 32, right rear side wall 42 that form 120 ° of angles with rear wall. The left front side wall 31 and the right front side wall 41 are bilaterally symmetrical; the left rear side wall 32 and the right rear side wall 42 are also bilaterally symmetrical.

[0023] When this kind of furnace is adopted, the flue gas outlet of the furnace can be arranged on the left rear side wall 32 or the right rear side wall 42 in addition to being conventionally arranged on the rear wall 2, and is connected with the cyclone separator inlet, which is beneficial to the inside of the furnace. The uniformity of the flow field can reduce the wear of the water walls on both sides of the flue gas outlet of the furnace.

[0024] The cross-section of the lower part of the hearth ...

Embodiment 3

[0026] like Figure 7 The polygonal circulating fluidized bed boiler furnace shown is used for circulating fluidized bed boilers with a partition screen 5 between the front and rear walls 1 and 2 of the furnace. The combination of rectangles, of which six sides are longer and the remaining eight sides are shorter, and the eight membrane walls corresponding to the shorter eight sides are composed of four water-cooled wall tubes and inter-tube fins. This structure can not only reduce the wear of the corners of the side walls of the furnace, but also reduce the wear of the corners formed by the junction between the partition screen 5 and the front and rear walls 1 and 2 of the furnace.

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Abstract

The invention is a hearth of the polygon circle fluidized bed boiler which is enclosed by the ceiling, the cloth wind board and the side wall. The cross section of the side wall top is the polygon with more than 4 sides and the internal angle more than 100degree; The invention makes it augment from 90degree to 100degree by changing the angle between the hearth side wall, so the particle collectedin the four right angles is diffused to big angle field, the particle density is decreased to light the friction; It also keeps the good flow and heat loading uniformity, especially proper for the hypercritical circle fluidized bed boiler.

Description

field of invention [0001] The invention relates to a circulating fluidized bed boiler, in particular to a circulating fluidized bed boiler furnace. Background technique [0002] The furnace of a circulating fluidized bed boiler is usually enclosed by a ceiling, an air distribution plate and a side wall, and is generally a membrane wall structure. The membrane wall consists of water wall tubes 10 and fins 11 between the tubes (see figure 2 , 3 ). The side wall of the furnace of a conventional circulating fluidized bed boiler is surrounded by four membrane walls, which are called the front wall 1, the rear wall 2, the left wall 3, and the right wall 4; the cross section of the furnace is generally rectangular ( see figure 1 ), the four corners of the furnace are generally approximately right angles, and the apex is a water-cooled wall tube (see figure 2 ), or the outermost water wall tubes of the two membrane walls are connected by 45° inclined fins (see image 3 ). ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/18F22B31/00
Inventor 吕清刚包绍麟高鸣孙运凯王东宇那永洁宋国良
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI