application of nickel alloy surfacing welding in waste incineration power plant |
Posted: October 6, 2019 |
Waste incineration power generation is a reliable way to handle family waste. Due to the intricacy and diversification of waste make-up, various very harsh gases such as chloride and sulfide will be created in the incineration procedure. Waste heater flue gas mainly consists of HCl and SO2, and also the content of HCl is considerably greater than that of SO2, so chlorine corrosion is the most crucial deterioration in waste incineration power plant. Chlorine tends to take place in burners as aeriform HCl, Cl2, as well as metallic chlorides such as KCl, NaCl, ZnCl2, and PbCl2. Along with the direct gas phase deterioration, these metal chloride low melting salt deposition as well as the surface of metal oxide film Redox will reaction each various other, which cause rust of steel matrix. They likewise collectively with other not natural salts in the flue gas down payments based on the wall surface in the high-temperature molten salt deterioration, in the dust-- regional liquid steel interface, creating the electrochemical deterioration setting. The additional diffusion of rust creates a layer of loosened external oxide movie on the exterior surface area of the molten chloride. Because of the high diffusion rate of metal ions in the molten salt, this electrochemical procedure seriously erodes the metal components in the water wall surface as well as superheater of the boiler, resulting in early degradation and also even failing of its efficiency. The deterioration of the sulfur aspect on the home heating surface tube of waste heater can not be overlooked. The rust of sulfur generally originates from the thermal deterioration of alkali metal salts, specifically Na3Fe(SO4)3 and also K3 Fe(SO4)3. At the very same time, a big amount of ash powder generated by garbage burning searches the surface of a home heating surface tube, resulting in different degrees of wear. Under the mixed action of numerous elements, the home heating surface pipe is continuously oxidized, worn away as well as put on from the outside to the within, as well as neighborhood burst happens when it can not bear the stress of water vapor in the pipe. As a cost-effective as well as quick product surface area adjustment approach, emerging welding is to bead welding the corrosion immune product like austenitic stainless steel, nickel-based alloy on the internal surface area of equipment, which is commonly used in the production and repair service of numerous industrial https://lkalloy.com equipment parts such as shutoffs, pipes, fittings, flanges, plates, and so on. For example, surfacing welding of alloy 625 in the waste incineration power generation system develops a corrosion immune layer as well as secure the inner surface of the tools from rust, prolonging the life span of the devices. Reduced dilution moms and dad material and high deposition rate are normally utilized to take full advantage of the performance of the overlapping layer. Theoretically, all corrosion-resistant alloys can be emerging welding like Inconel 625, Incoloy 825, C276, Monel 400, and so on. Chromium-nickel austenitic stainless steel appearing in numerous hydrogenation reactors can efficiently stop hydrogen deterioration on the steel surface. The internal wall surface of the urea synthesis tower is bonded with ultra-low carbon molybdenum-containing austenitic stainless steel. In order to reduce the overall task expense, we can execute a 2-3 mm thickness appearing welding with alloy C276, C22 or 625 alloy layer on the metal material surface of all kinds of large devices and devices. The corrosion of waste warm boiler heating surface tube can be resolved by appearing a layer of high temperature immune nickel-based alloy material on the external wall of central heating boiler tube. The standard surfacing welding method has serious damage to the base product of the boiler tube, and the dilution price of 10% ~ 20% is hard to fulfill the requirements. CMT (Cold Metal Transfer) welding system is adjusted to emerging a layer of Inconel 625 product with high-temperature resistance as well as rust resistance on the home heating surface of the boiler, which can successfully fix the deterioration trouble of the heating surface area pipe and also extend the service life of the central heating boiler. In the case of high-load operation, the service life of steel pipeline can reach more than 5 years, and also fix the problem of heating surface area rust as well as pipe wall ash, considerably improve the thermal conversion effectiveness and power generation.
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