Wear-resistant elbows can be favored by the market and continue to replace some traditional wear-resistant materials. The fundamental reason is their product quality and their advantages compared with traditional wear-resistant materials, such as cast stone, cast steel and pasted ceramic materials. Multiple advantages.
1. Performance comparison
1. Paste the ceramic sheet
There are many microscopic gaps, brittle and fragile, and it is easy to partially fall off and fail, and it is difficult to repair after falling off.
2. Cast steel
Cast steel (including alloy steel) is widely used in the field of anti-wear, and its manufacturing process is relatively simple. However, due to the limitations of material performance and process, the surface hardness of cast steel materials (about 55) is much lower than that of ceramics (above 80), and the wear resistance is only a few tenths of that of ceramics. (For specific data, see According to the wear test report of the Central South Powder Metallurgy Institute and the jet wear test results of the Kyushu Industrial Ceramics Research Institute of Japan), the elbows made by it have been worn out after more than a year of operation. In addition, the cast steel pipe is thick, heavy, and has a high carbon content, and the weldability is relatively poor. On-site heat treatment of the weld seam is required, which brings considerable difficulties to on-site installation and maintenance.
3. Cast Stone
In the past, most of the elbows in each factory used cast stone elbows. This material is characterized by brittleness, cracking, and wear-resistant backpacks. The wall thickness is 25-35 mm, and some are nearly 40 mm. The inner side is sharpened for a short time. After cracking, the pulverized coal wears outward with the gap, and its service life has only one overhaul period. Moreover, there are often pores inside, which is easy to leave hidden dangers. Once worn, it cannot be repaired on site.
4. Composite ceramics
5. A ceramic composite pipe and elbow product produced by aluminothermic centrifugal process with the help of industrial standard mass-produced steel pipe as the base material, came into being as a new generation of wear-resistant elbows, and the steel pipe and ceramics are firmly combined without It is used by thickness. The thickness of the wear-resistant layer of this product is generally about 3.5-5mm. Thickness is used for wear resistance. In the past, thickness was used to prevent wear-resistant materials. In addition to these, the reasons for choosing it are good weldability, and steel pipe. The welding method is the same, and the construction is convenient.
2. Price comparison
The price of the elbow in the market is: 12,000 yuan per ton for paste, 13,000 yuan per ton for cast stone elbow, and about 20,000 yuan per ton for alloy elbow. These types of elbows are particularly heavy, and they profit from their weight. That is to say, the price of an alloy elbow is twice that of a wear-resistant ceramic elbow. With the money of one alloy elbow, two wear-resistant ceramic elbows can be bought. The service life of the wear-resistant ceramic elbow is the same as that of this alloy. 6-8 times the elbow, use the price to service life ratio, that is, buy a wear-resistant ceramic elbow with 1/5 of the price of the alloy elbow.
For example: the diameter of a powder feeding elbow in a thermal power plant is φ325*10, a 90° elbow, the bending radius R=1700mm, the cast steel elbow or bimetal composite elbow is used, and the weight is W=1300kg. The weight is about 400-500 tons; while the wear-resistant ceramic elbow is used, its weight is only about W=450kg, and the total weight of all the elbows is about 110-130 tons; it can be seen from the comparison that the wear-resistant ceramic elbow is used directly. The main reason is that the weight of the elbow is greatly reduced, and the investment is less than 2 million yuan (the unit price of the cast steel elbow or bimetal composite elbow is 13,000 yuan / ton), and the weight reduction does not include the load of the civil structure beam between the coal bunkers. The economic benefits brought about by the reduction of , as well as the economic benefits brought about by the saving of support and hanger materials.
The performance and price of the elbows of several materials are compared above. It can be seen that the wear-resistant ceramic composite elbows are cost-effective both in terms of initial investment and operating costs!
