Ceramic wear-resistant elbow is a kind of corundum ceramic lining wear-resistant composite elbow, one kind of ceramic composite steel pipe. The ceramic composite steel pipe is manufactured by a high-tech production process from the high-temperature clutch synthesis method. The tube is composed of corundum ceramic, transition layer and steel from the inside to the outside. The ceramic layer forms dense corundum porcelain (AL2O3) at a high temperature above 2200 °C, and forms a firm bond with the steel tube through the transition layer. The composite pipe has fully exerted the high strength, good toughness, impact resistance, good welding performance and high hardness, high wear resistance, corrosion resistance and heat resistance of the steel tube, which overcomes the low hardness, poor wear resistance and poor ceramic toughness of the steel tube. specialty.
First, metallurgical and power industries need to consume large quantities of metal pipes every year to transport pulverized coal, ash, mud, lime gypsum slurry. The ceramic composite pipe is used to replace other pipes, and has the characteristics of high wear resistance, long service life, convenient installation and remarkable economic benefits. Shandong Liaocheng Changrun Thermal Power Plant, Liaocheng Zhonghua Power Plant, Beijing Beixin Building Materials Group, Henan Hebi Power Plant, Gansu Pingliang Power Plant, Taiyuan Coal Preparation Plant, Hunan Shimen Power Plant, Hebei Jinniu Energy Co., Ltd. Gequan Coal Preparation Plant, Xingtai Coal Preparation Plant When it is industrially operated, its operating life is ten times or even dozens of times that of steel pipes.
Second, (1) Mine: Mine filling, concentrate powder and tailings transportation are serious to the pipeline. The used powder conveying pipelines such as Panzhihua and Daye Mine have been used for less than one year. The life expectancy is increased by about 5 times.
(2) Coal: The coal transportation and long-distance pipeline coal transportation are generally carried out by wet method. The conveying pipe is required to be both wear-resistant and corrosion-resistant. The pipe can be used as a long-life conveying pipe with considerable economic benefits.
Centrifugal casting composite ceramic elbow
Widely used in electric power, metallurgy, mining, coal, petrochemical and other industries, it is an ideal wear-resistant, corrosion-resistant, high-temperature (low temperature resistant) pipeline. The centrifugally cast composite pipe is a composite pipe manufactured by "self-grown high-temperature synthesis-high-speed centrifugal technology" to form a uniform, dense and smooth surface ceramic layer and transition layer at high temperature and high speed. In addition, the working temperature of 850 ~ 900 degrees ceramics will not fall, the weight is lighter, the composite ceramics with hardness to prevent wear, to solve the past thickness to wear. At present, straight pipes, elbows, elbows, tees, etc. are very effective in the industry with severe wear and tear.
Full name ceramic-lined composite steel pipe.
The composite pipe has fully exerted the high strength, good toughness, impact resistance, good welding performance and high hardness, high wear resistance, corrosion resistance and heat resistance of the steel tube, which overcomes the low hardness, poor wear resistance and poor ceramic toughness of the steel tube. specialty. Therefore, the composite pipe has good comprehensive properties such as good wear resistance, heat resistance, corrosion resistance, mechanical shock resistance, thermal shock resistance and weldability. It is an ideal wear-resistant and corrosion-resistant pipe for conveying granular materials, grinding and corrosive media.
Patch wear tube
The patch wear tube is glued to the inner wall of the pipe with an alumina ceramic sheet. The product has a simple manufacturing process and a long production cycle. The use environment must not exceed 150 degrees.
Spot welding card type wear tube
The spot-welded card-type wear-resistant tube is made of a high-temperature and strong-adhesive glue to adhere the intermediate-pored alumina ceramic piece to the inner wall of the pipe, and the spot welding process is used to firmly weld the ceramic to the inner wall of the steel pipe through the small hole. To protect the solder joint, screw the ceramic cap on top. The production process of the product is relatively complicated, the production cycle is long, and the cost is high.
Composite pipe characteristics
1, good wear resistance
The ceramic composite pipe has a Mohs hardness of 9.0 equivalent to HRC90 or more because the inner liner is corundum ceramic (a-AL2O3). Therefore, the grinding media conveyed by the metallurgy, electric power, mining, coal and other industries have high wear resistance. It has been confirmed by industrial operation that its wear life is ten times or even several times that of hardened steel.
2, low running resistance
Since the inner surface of the SHS ceramic composite pipe is smooth and never rusted, it does not have a convex spiral on the inner surface of the seamless steel pipe. Tested by the relevant testing unit for the inner surface roughness and water resistance characteristics, the inner surface smoothness is better than any metal pipe, and the clearing resistance coefficient is 0.0193, which is slightly lower than the seamless pipe. Therefore, the tube has the characteristics of low running resistance and can reduce operating costs.
3, corrosion resistance, anti-fouling
Since the steel ceramic layer is (a-AL2O3), it is a neutral trait. Therefore, it has acid and alkali resistance and seawater corrosion resistance, and at the same time has anti-scaling and other characteristics.
4, temperature resistance and heat resistance
Due to the corundum ceramic (a-AL2O3), it is a single stable crystalline structure. Therefore, the composite pipe can operate normally for a long time in the temperature range of -50--700 °C. The coefficient of linear expansion of the material is 6-8×10-6/0C, which is about 1/2 of that of the steel pipe. The material has good thermal stability.
5, low engineering cost
The ceramic composite tube is light in weight and suitable in price. It is 50% lighter than the inner diameter of the cast stone pipe; it is 20-30% lighter than the wear-resistant alloy pipe, and has good wear resistance and corrosion resistance, because of the long service life, thus the cost of the hanger, the handling fee, the installation fee, and Operating costs are reduced. According to the actual project budget and engineering actual comparison between the design institute and the construction unit, the cost of the pipe project is equivalent to that of the cast stone. Compared with the wear-resistant alloy pipe, the project cost is reduced by about 20%.
6, easy to install and construct
Because the tube is light in weight and has good welding performance. Therefore, welding, flange, quick coupling, etc. can be adopted, and the construction and installation are convenient, and the installation cost can be reduced.