Application of wear-resistant ceramics for wear equipment

 1. Main performance characteristics of wear-resisting ceramic lining board: Wear-resisting ceramic lining board is a special corundum ceramic made by sintering at 1700℃ with alumina as the main raw material, rare metal oxide as flux, and then combined with special rubber and high strength organic or inorganic adhesives.It has the following main performance and characteristics:

(1) High hardness, rockwell hardness is 85-90,

(2) It has good wear resistance and long service life. Its wear resistance is 266 times that of manganese steel and 171.5 times that of high-chromium cast iron.

(3) With wide usability, there is a glue-type liner suitable for direct feeding in low temperature environment;There is an impact-resistant liner suitable for the impact of large materials;It has a straight stick lining board for conveying powder in high temperature environment by wind.It has a quick tubular composite lining adapted to the special shape;It has the adhesive ceramic fan blade adapted to the dynamic operation and high speed operation.

2. Application in power plants

(1) Application in pulverized coal making system In coal-fired power plants The wear of pulverized coal making system is mainly caused by pulverized coal collision, friction and impact.The wear of high-speed pulverized coal flow to the equipment of pulverized coal making system, especially to the outlet pipe of coal mill, the elbow of primary air pipe and the inlet and outlet pipe of coarse and fine powder separator is particularly serious.To the control of the powder system of each power plant to adopt methods: the application of wear-resistant rubber series, although its wear-resistant performance is superior to the steel plate and the strength, adhesion and so on is better;But its disadvantage is that the construction is difficult and the cost is high.The application of cast stone anti-wear, its wear resistance is stronger than the general steel plate, but its disadvantage is brittle and weight, not only by the equipment system load safety system restrictions, and easy to break in the installation process.Also because of the thick slab thickness and large volume, the flow section of the equipment decreases, the flow rate increases, but also increased the degree of wear.Its service life and wear - resistant ceramic liner is difficult to compare.The application of wear - resistant ceramic lining board, its effect is more ideal, has been well received by users.After use, the powder system is not only wear - resistant, does not fall off, but also has no effect on the system.Its advantages are simple construction and low cost, showing its good prospects for development.

(2) In the application of ash system in power plants using hydraulic ash removal and slag discharge system, ash pump, ash groove nozzle and other inlet and outlet pipe sections, is the most easy to wear parts, according to the site working conditions, adhesive ceramics is more suitable.Based on the usage of some power plants, these parts work very well.Maintenance crews no longer frequently plug leaks and replace equipment, and site hygiene has greatly improved.

(3) Application in coal transportation system the wear of equipment of coal transportation system is mainly caused by scratch and impact.The most easy to wear parts are coal cylinder, tee, baffle, etc., the general power plant used anti-wear methods: the application of lined manganese steel, this method is not ideal, the reason is that the steel plate is not wear-resistant, short service cycle (generally in 6 months or so), and easy to stick coal plug;Bring maintenance workload to the maintenance personnel.The application of ULTRA high molecular weight polyethylene plate, although not easy to stick coal plug;But the wear resistance and impact resistance is not as good as the steel plate, especially between the lining plate and the cylinder wall easy to squeeze in raw coal from the joint, so that the lining plate bulge and fall off.Since the use of UHMWPE board in 1997, the lining board of some coal falling plants has fallen off several times, causing the chain to get stuck or even cause the chain to bend.It brings unnecessary maintenance workload to maintenance personnel and seriously affects production safety.The application of adhesive ceramic lining board is a composite lining board which is made by pressing ceramic lining board into special rubber, its wear resistance, impact resistance and inner wall smoothness are greatly improved.According to the application of some power plants, it is an ideal way to prevent wear and prevent leakage.

Conclusion .

(1) As a kind of high-tech products, wear-resistant ceramic lining is being used more and more widely.The reason is that the technology is mature and the cost is getting lower and lower;Generally get the favor of the user.

(2) As there are various series of wear resistant lining plates, such as adhesive type, impact resistant type and adhesive type, users can choose different types according to the actual situation.
(3) Due to the adhesive is affected by certain conditions, its scope of use is limited, but with the emergence of new materials and technologies, the application will be more and more.