The density of refractory plastic is generally 2.95g/cm3. The construction of refractory plastic is carried out by tamping and pounding, which has a long construction period and high labor intensity. Therefore, the development has been limited to a certain extent. Refractory plastics are divided into clay, high alumina, mullite corundum, chromium, silicon carbide, and zirconium based on the type of refractory aggregate. According to the type of binder, it is divided into composite binders such as raw clay and aluminum sulfate, phosphoric acid, phosphate, water glass, and resin. According to the hardening properties at room temperature, it can be divided into air-hardening and thermosetting refractory plastics.
Fire-Resistant and Wear-Resistant Plastic Refractory and Their Applications
In the scope of unshaped refractory materials, common wear-resistant refractory plastics with fire-resistant and wear-resistant properties are generally divided into corundum-based high-strength wear-resistant refractory plastics and high-alumina high-strength wear-resistant refractory plastics.
Wear-resistant plastic
Wear-resistant plastic is a high-alumina, corundum granular product. Compared with traditional refractory plastics, it has excellent properties such as simple construction, high efficiency, good molding, and high strength. The material is composed of adhesive, refractory aggregate, and hardening accelerator, and a plastic refractory for boiler mud is formed after adding a certain proportion of PA glue. It is convenient for the construction of various complex parts. It is an air-hardening material with low-temperature hardening properties to ensure the wear resistance of circulating fluidized bed boilers.
Wear-resistant plastics have a wide range of applications, and the materials and binders used can be selected according to the conditions of use. It can be directly poured into a lining body, and can also be used as a prefabricated block by pouring or shaking. Suitable for high-temperature areas that generate a small amount of friction. Such as the bottom air chamber of the boiler, the primary air duct, the feed riser (leg), the feeder, the feed pipe, the rear flue furnace wall, the slag cooler, the filling of each furnace door of the tail flue, etc.
Refractory and wear-resistant plastic
Wear-resistant and refractory plastics are made of high-alumina bauxite clinker, corundum, mullite, and silicon carbide as aggregates. It has excellent wear resistance, super bonding, and high service temperature. It is a refractory material with high strength and wear resistance formulated with different binders and admixtures. It has the advantages of convenient construction, good plasticity, and good wear resistance. The wear-resistant layer after construction has high strength and wear resistance, which can fully meet the performance requirements of wear-resistant refractory materials for boilers.
The refractory and wear-resistant plastic is suitable for the construction of thin parts such as the furnace water wall. It is mainly used in the dense-phase area of the furnace and the steam-cooled and water-cooled cyclone separators and other parts. The wear-resistant refractory material in this area is designed as a single-layer ramming structure, which is fixed with wear-resistant pins. Its design thickness is relatively thin, and it is directly laid on the construction surface.
Application in refinishing circulating fluidized bed cyclones. It’s super strong bonding performance can repair any irregular wear parts at will. There is no need to use steel formwork or molds, and it can be ignited immediately after construction without special maintenance. Thereby shortening the construction period and saving costs.
The Corundum wear-resistant refractory plastic belongs to the field of high-temperature wear-resistant refractory materials. The raw materials are composed of high alumina homogeneous material, alumina micro-powder, silica micro-powder, clay, phosphoric acid, aluminum dihydrogen phosphate solution, and pure calcium aluminate cement. It is characterized by the use of synthetic homogeneous materials with low water absorption, low porosity, and high uniformity to replace traditional natural raw materials or corundum composite raw materials of sintered bauxite clinker with high water absorption, high porosity, and poor uniformity. A homogeneous corundum high-strength wear-resistant plastic is produced.
The Corundum wear-resistant and refractory plastic is mainly used in the dense phase area of the furnace and steam-cooled / water-cooled/adiabatic cyclone separator and other parts. The wear-resistant refractory material in this area is designed as a single-layer ramming structure, which is fixed with wear-resistant pins. Its design varies in thickness, and the general thickness is 40-60mm (air-cooled/water-cooled), and 320-350mm (diabatic). Just lay it directly on the construction surface.
Silicon carbide corundum wear-resistant refractory plastic is a high-grade refractory material. It has excellent wear resistance, super bonding, and high service temperature. It is also famous for its simple construction process, short construction period, and no need for an oven after construction. After practice, its service life is significantly higher than other wear-resistant refractory materials, and it is widely used in electric power, metallurgy, steel, ceramics, and other industries.
Silicon carbide wear-resistant and refractory plastic can be widely used in cyclone separators, heat radiation materials, and other parts where refractory materials are used. It has super-strong bonding performance and can be freely applied and rammed to any irregular wear parts so that the degree of wear is greatly reduced. There is no need to use steel formwork or molds, and it can be ignited immediately after construction without special maintenance. Thereby shortening the construction period and saving costs.
Refractory Plastics for Power Plant Boiler Furnace
The boiler furnace of a power plant is a high-temperature environment. In order to ensure the safe and stable operation of the furnace, it is necessary to use refractory plastics for repair and maintenance. Commonly used refractory plastics include aluminum silicate plastics, corundum wear-resistant plastics, corundum mullite castables high alumina plastics, and magnesium aluminum plastics. Among them, aluminum silicate plastics are suitable for high-temperature occasions below 1000 °C, while high-alumina plastics and magnesium-aluminum plastics are suitable for high-temperature occasions above 1000 °C.
When choosing a specific plastic refractory for boiler, a variety of factors need to be considered, such as temperature, wear resistance, shock resistance, chemical stability, etc. In addition, it is also necessary to select different types of plastic materials according to the actual situation and use requirements of the boiler furnace of the power plant, combined with the construction process and technical requirements.
Rongsheng refractory manufacturers generally recommend consulting professional refractory suppliers or engineers before purchasing refractory and wear-resistant plastic refractory for boiler. And choose the most suitable refractory plastic material for the furnace of the power plant boiler according to its suggestion.
