The key to product quality of refractory castable for CFB boiler construction

      The wear-resistant refractory castable is composed of corundum, mullite, activated alumina superfine powder, silicon carbide superfine powder, silicon micropowder, pure calcium aluminate cement and so on. It has the properties of wear resistance, corrosion resistance, high temperature, long life, good fluidity, and ease of construction. The wear-resistant and refractory castables produced by Yuntai Technology are mainly used in the furnace fire belt and hanging screen of circulating fluidized bed boilers. , Water-cooled wall cyclone separator and other thin-walled furnace walls. Here the fuel particles are large, and there are a lot of fuel particles. The falling of the bed material and ash along the four walls causes serious wear on the furnace lining, and the CO concentration is also high. The furnace wall is thin and the construction is difficult. In particular, the Fe2O3 content in the lower part of the furnace (including the air distribution plate) and the return inclined pipe and the castable at the furnace inlet shall be ≤0.75% to prevent the reduction reaction of CO in the flue gas with the castable and cause damage to the castable. The high-strength wear-resistant refractory castable has low Fe2O3 content, which can fully resist CO erosion, and the furnace body structure has good integrity after construction.

Wear-resistant refractory castable

      Wear-resistant and refractory castables for boilers are suitable for the lining of the severely abraded and impacted parts of coal ash, such as circulating fluidized bed boilers and coal-burning belts. Its main physical and chemical properties are as follows:

High-strength wear-resistant refractory castable

   Matters needing attention in construction

   In addition to the wear-resistant and refractory castable itself, the factors affecting the quality of the furnace wall, the construction quality is also a very important factor. That is to say, after the material quality has passed, there must be excellent construction to ensure that the furnace wall of the circulating fluidized bed boiler can be successfully completed. When constructing wear-resistant and refractory castables, the following points should be paid attention to:

   1. All metal and castable contact surfaces should be coated with asphalt or wrapped with ceramic fiber paper;

   2. Wear-resistant and refractory castables with different properties are used in different locations, and the performance of the castables used in each area during construction cannot be lower than the requirements specified in the area;

   3. The castable must be compacted during construction;

   4. After trial operation and shutdown of the furnace, a comprehensive inspection of the wear-resistant lining must be done. For the parts that need to be reworked and repaired, the original wear-resistant layer must be removed. Whether it is wear-resistant refractory castables or self-flowing wear-resistant castables, it is necessary to completely remove the equipment leaking from the reworked parts. For the interface between the wear-resistant layer and the original wear-resistant layer again, it is better to leave a vertical seam, which can prevent ignition and operation After the layered shelling or peeling, other metal fixing parts such as Y-shaped grab nails should be added according to the situation. After the repaired part is constructed, heating measures should be adopted to ensure solidification and dehydration so that the boiler can be put into operation as soon as possible.

      Shandong Yuntai Furnace Technology Co., Ltd. is a professional supplier of a series of services for the production, construction, oven and maintenance of wear-resistant refractory products such as circulating fluidized bed boilers, biomass boilers, pulverized coal boilers, and garbage incinerators. The main products are power plant castables, high-strength wear-resistant castables, corundum refractory plastics, corundum wear-resistant castables, thermal shock resistant castables, low cement castables, high-strength lightweight thermal insulation castables, refractory concrete, aluminum silicate fiber Refractory products such as blankets, aluminum silicate fiberboard, aluminum silicate fiber paper, refractory clay bricks, high alumina bricks, aluminum phosphate wear-resistant bricks, high temperature mortar, PA mortar, refractory mortar and other refractory products, Zibo Yuntai Technology specializes in the production of wear-resistant refractory casting The material has good wear resistance, high quality, long life and complete models. Welcome to inquire!