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Anti-wear device for membrane water wall of circulating fluidized bed boiler

A membrane-type water-cooled wall and circulating fluidized bed technology, applied in boiler water pipes, steam boilers, steam boiler accessories, etc., can solve the problems affecting the heat transfer, wear and economic loss of the heating surface, so as to improve the combustion utilization rate, increase the Heat transfer efficiency, the effect of increasing the heating area

Active Publication Date: 2020-04-14
江苏能建机电实业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] From the perspective of fluid dynamic characteristics and fluidization theory in the furnace, the furnace of circulating fluidized bed boiler is in a state of rapid fluidization. From the top to the bottom of the furnace, the flow velocity, particle concentration and flux of the wall-adhering flow gradually increase. The temperature of the water-cooled wall is different from the middle of the furnace to the periphery of the furnace. The rapid drop of high-concentration and large-flux bed material in the furnace has caused erosion on the water-cooled wall. Although the wall-adhesive flow formed by the drop of bed material has strengthened The water-cooled wall exchanges heat, but it also wears the water-cooled wall
The anti-wear technology of the existing anti-wear plate is to destroy the flow velocity and flow direction of the wall-adhering flow particles, thus playing a good anti-wear effect, but to a certain extent, it affects the heat transfer of the heating surface and affects the efficiency of the boiler. And it may cause the accumulation of fuel on the wear-resistant plate, which will affect the combustion and heat transfer efficiency; while the high-temperature spray anti-wear technology needs to invest a lot of money, and the service life is short, and it will cause local wear after falling off. If it cannot be repaired and maintained in time, it may caused a pipe burst
[0005] The wear of the water-cooled wall tube of the circulating fluidized bed boiler is a bottleneck restricting the long-term safe and economical operation of the boiler. If it is not paid attention to, it may cause irreparable consequences. The wear of the water-cooled wall tube of the circulating fluidized bed boiler will cause the overall or partial thinning of the tube wall , forming a serious safety hazard, resulting in the replacement of partial or large-area water-cooled wall tubes, increasing economic costs, delaying the construction period, and causing safety hazards and economic losses to the society and users

Method used

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  • Anti-wear device for membrane water wall of circulating fluidized bed boiler
  • Anti-wear device for membrane water wall of circulating fluidized bed boiler
  • Anti-wear device for membrane water wall of circulating fluidized bed boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as Figure 1-3 As shown, a membrane type water wall anti-wear device for a circulating fluidized bed boiler includes a water wall tube 1 and a connecting plate 2 welded between the water wall tubes, and several U-shaped tubes are vertically arranged along the axial direction of the water wall tube Water-cooled pipe 3, the U-shaped water-cooled pipe 3 is covered with an anti-wear roller 4;

[0038] The U-shaped ends of the U-shaped water-cooled pipe 3 are welded and fixed to the water-cooled wall pipe 1, the U-shaped water-cooled pipe 3 is connected to the water-cooled wall pipe 1, and part of the cooling water in the water-cooled wall pipe 1 passes through the U-shaped water-cooled pipe 3 ;When water flows in the water-cooled tube of the membrane-type water-cooled wall, it will also pass through the U-shaped water-cooled tube, which increases the heating area, and can effectively reduce the temperature of the anti-wear roller, preventing its temperature from being ...

Embodiment 2

[0050] Such as Figure 4 As shown, it is similar to Embodiment 1, the difference is that the anti-wear rollers 4 are respectively arranged on the U-shaped bottom and two U-shaped sides of the U-shaped water-cooled pipe 3 . Anti-wear rollers 4 are also arranged on the two U-shaped sides of the U-shaped water-cooled tube 3, which helps to protect the two U-shaped sides of the U-shaped water-cooled tube protruding from the membrane water wall, prolongs the service life, and prevents the tube from bursting.

Embodiment 3

[0052] Such as Figure 5As shown, it is similar to Embodiment 2, the difference is that each of the water-cooled wall tubes 1 is provided with three U-shaped water-cooled tubes 3 arranged side by side. The higher the density of the U-shaped water-cooled pipe 3 and the anti-wear roller 4 is, the better the protection effect on the membrane water-cooled wall will be.

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Abstract

The invention relates to a membrane water-cooled wall anti-wear device of a circulating fluidized bedboiler. The device comprises water-cooled wall tubes and a connecting plate welded between the water-cooled wall tubes. U-shaped water-cooled tubes are arranged in the axial direction of the water-cooled wall tubes and are sleeved with anti-wear rollers. By means of the U-shaped water-cooled tubes,the heated area of a membrane water-cooled wall is increased, and the heat transfer efficiency is improved; cage-shaped protection layers are formed by the anti-wear rollers, and the membrane water-cooled wall is effectively protected; granular protrusions on the anti-wear rollers contribute to promoting crushing of solid granule fuel after impacting, and the combustion utilization rate of the solid granule fuel is improved; and after the solid granule fuel impacts on spiral grooves in the anti-wear rollers, impacting force within a certain angle range can be generated, the anti-wear rollersare pushed to rotate, all parts of the anti-wear rollers can receive impacting, uniform wear is achieved, and the service life of the anti-wear rollers is prolonged.

Description

technical field [0001] The invention belongs to the technical field of damage prevention for circulating fluidized bed boilers, and in particular relates to an antiwear device for membrane water cooling walls of circulating fluidized bed boilers. Background technique [0002] The circulating fluidized bed boiler adopts the clean coal combustion technology with the highest degree of industrialization. The circulating fluidized bed boiler adopts fluidized combustion, and its main structure includes two parts: the combustion chamber (including the dense-phase zone and the dilute-phase zone) and the circulating furnace (including the high-temperature gas-solid separator and the return system). The biggest difference from the bubbling fluidized bed combustion technology is that the operating wind speed is high, which strengthens the heterogeneous reaction process such as combustion and desulfurization, and the boiler capacity can be expanded to a large capacity (600MW or above) a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B37/10
CPCF22B37/108
Inventor 王军郭余庆施吉祥季震祥季荣华姚青松朱云珍郭国庆
Owner 江苏能建机电实业集团有限公司