Take a look at the “cutting-edge technology” on the device: 52 – Chromium carbide wear-resistant layer cladding
Thread Content
In the raw material processing areas and power centers (power plants) of coal chemical plants, there are numerous devices and components that are subject to high-speed impact and wear. Using ordinary steel, cast steel, or high-manganese steel and high-chromium steel presents economic and operational drawbacks. Is it possible, at an acceptable cost, to appropriately process these wear-resistant components, increase their hardness, enhance their wear resistance and impact resistance, and thus extend the service life of the equipment? Sharing some experience gained by workers during maintenance work——the surfacing of chromium carbide wear-resistant layers. For more shares, please check the “Explore the ‘Cutting-edge Technologies’ on Devices” series: https://bbs.hcbbs.com/thread-3056492-1-1.html
Case 1: The coal unloader is the most important equipment for unloading coal in the raw material workshop of coal chemical plants or in the fuel workshop of thermal power plants. The screw is the core component of this equipment; it is also the component that wears out most easily and requires significant investment. Its condition directly affects the efficiency of coal unloading as well as the safety in using coal.
The auger is made entirely of low-alloy high-strength structural steel, specifically 16Mn, and possesses excellent formability, weldability, and wear resistance. Due to the large volume of coal unloaded throughout the year and the frequent operation of the unloading machines, the 16-manganese material suffers the most severe wear, resulting in a significantly shortened service life. After just over a year of normal use, the edges of the auger blades become thin and bent due to excessive wear, which greatly reduces the efficiency of the personnel responsible for unloading coal. To effectively address the issue of auger blade wear and increase the operational efficiency of the equipment, it was decided to use chromium carbide wear-resistant welding rods for cladding the edges of the auger. This approach enables high wear resistance and durability, thereby extending the mechanical lifespan of the equipment; at the same time, it also confers high toughness and corrosion resistance to the equipment.
After the unit was shut down, maintenance technicians carried out technical modifications by welding a chromium carbide wear-resistant layer onto the edges of the auger screen of the coal unloading machine. Since the implementation of this approach on a wider scale, significant improvements have been achieved: the service life of the auger has increased from 1.5 years to 3 years, reducing the frequency of routine inspections of the equipment as well as the need to replace components. This has led to savings in costs related to equipment parts and maintenance.
Case 2: The exhaust fan is a key component of a power plant’s dust removal system. Due to the high amount of dust, the blades of these fans need to be replaced every 2 months on average, which not only disrupts production but also increases costs. Blades manufactured using the chromium carbide high-wear-resistant layer surfacing technique, with a 3mm thick wear-resistant alloy applied to their crossbars, have a service life that is ten times longer than before.
This technology can also be applied to the technical upgrades of equipment components under similar operating conditions, such as: coal grinder/crusher components, burner pipelines, ash discharge pipes, linings for coal conveyors and hoppers, slag discharge tanks, and so on.
Similar technologies can also be explored: Take a look at the \"cutting-edge technology\" No. 9 – the silicon carbide repair technique for corroded pump motors: https://bbs.hcbbs.com/thread-3053803-1-1.html