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A wear-resistant circulating fluidized bed boiler combustion chamber water wall

A circulating fluidized bed and water-cooled wall technology, which is applied to fluidized bed combustion equipment, fuels burned in a molten state, combustion types, etc. problems, to achieve the effect of easy installation and implementation, lower operating costs, and protection from wear and tear

Active Publication Date: 2019-11-22
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wear of the water wall shortens the continuous operation period of the circulating fluidized bed boiler, increases the operation and maintenance costs, and reduces the utilization rate of the unit; wear has become the biggest constraint factor affecting the long-term safe operation of the circulating fluidized bed boiler
[0003] Aiming at the above wear problem of the circulating fluidized bed water wall, some measures have been taken in the existing technology. The traditional anti-wear measures include castable anti-wear, installation of anti-wear protection tiles, etc., but these anti-wear measures will be at the end of the anti-wear position. There is a new phenomenon of wear, and the Chinese utility model patent application number: 201520515269.3 discloses "a new type of circulating fluidized bed boiler anti-wear fin". To avoid the wear of the solid particles in the flue gas on the water-cooled wall tubes, but this reduces the contact between the flue gas and the water-cooled wall, reduces the local heat transfer, and has a relatively large negative effect on the economic benefits of the boiler, and such a device The structure is relatively complicated to install. Therefore, the Chinese utility model patent application number: 201520515269.3 disclosed "a new type of circulating fluidized bed boiler anti-wear fin" has the above-mentioned deficiencies

Method used

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  • A wear-resistant circulating fluidized bed boiler combustion chamber water wall
  • A wear-resistant circulating fluidized bed boiler combustion chamber water wall
  • A wear-resistant circulating fluidized bed boiler combustion chamber water wall

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: as figure 1 As shown, this embodiment includes water-cooled wall tubes 2 , fins 1 between the water-cooled wall tubes, diverter baffles 4 vertically arranged on the fins 1 , and flue gas passage holes 3 arranged on the diverter baffles 4 . The flue gas can pass through the flue gas through hole 3 , and the solid particles in the flue gas are blocked by the splitter baffle 4 , thereby reducing the wear rate of the water-cooled wall tube 2 .

Embodiment 2

[0030] Embodiment 2: as figure 2 , image 3 As shown, in this embodiment, the flue gas through holes 3 are opened on the side where the diverter baffle 4 contacts the fin 1 , and the flue gas through holes 3 of two adjacent diverter baffles 4 are arranged alternately. The flue gas through holes 3 are arranged on the side where the diverter baffle 4 is in contact with the fin 1 to ensure more sufficient heat exchange between the flue gas and the water-cooled wall tube 2. Guarantee that the solid particles passing through the previous diversion baffle 4 are completely blocked by the rear diversion baffle 4 . The flue gas through hole 3 can be different shapes, in order to increase the flow area, preferably image 3 comb-shaped vias shown.

Embodiment 3

[0031] Embodiment 3: In this embodiment, the height of the comb-shaped flue gas passage hole 3 along the radial direction of the water-cooled wall tube 2 is 0.5-2 times the radius of the water-cooled wall tube 2, and the width along the axial direction of the water-cooled wall tube 2 is 1-2. 5cm, the interval between two adjacent comb-shaped flue gas through holes 3 is 2-10cm, preferably, the height of the comb-shaped flue gas through holes 3 along the radial direction of the water-cooled wall tube 2 is the same as the radius of the water-cooled wall tube 2, along the The axial width of the water wall tube 2 is 2 cm, and the distance between two adjacent comb-shaped flue gas passage holes 3 is 4 cm.

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Abstract

The invention relates to a novel wear-preventing water wall of a combustion chamber of a CFB (Circulating Fluidized bed Boiler). The water wall is characterized in that two rows of vertical flow distribution baffles are lengthways arranged on a fin between every two adjacent water wall pipes; comb-shaped smoke through holes with the same height are formed in each flow distribution baffle at equal intervals; the hole ends of the flow distribution baffles are arranged together with the fins; and the comb-shaped smoke through holes of the two adjacent flow distribution baffles on each flow distribution baffle are arranged in a staggering way. The water wall provided by the invention is reasonable in structure and easy to mount and implement, and can prevent the water wall pipes from being worn by solid particles in the combustion chamber of the CFB without affecting the thermal efficiency of the CFB.

Description

technical field [0001] The invention relates to a water-cooled wall of a combustion chamber of a boiler, in particular to a water-cooled wall of an anti-wear circulating fluidized bed boiler combustion chamber. Background technique [0002] Circulating fluidized bed boiler (CFB) technology is a high-efficiency, low-pollution and clean coal-fired technology. The water wall of circulating fluidized bed boiler is an important heating surface of the boiler and an important part to ensure the efficient operation of the boiler. During the operation of circulating fluidized bed boilers, the problem of high-temperature wear and thinning of solid particles on the water-cooled wall and other heating surfaces is very serious, especially in the water-cooled wall area near the inlet of the cyclone separator. Due to the high flow velocity and high degree of turbulence in this area, The wear of the water-cooled wall tubes in the horizontal direction of the boiler is more serious, and the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/18
CPCF23C10/18F23C2206/10
Inventor 肖旻砚郭延军乔力捷赵元元石岩邱质彬宋蒙晋付伟智燕
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD