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The operating temperature of the circulating fluidized bed boiler is high, and the temperature in the furnace changes frequently, resulting in thermal shock. At the same time, there are many high-temperature solid particles in the furnace, which continuously erode the heating surface, so it is necessary to lay wear-resistant refractory materials for maintenance. Types and characteristics of wear-resistant refractory materials for circulating fluidized bed boilers: Wear-resistant refractory type Introduction of wear-resistant refractory materials for circulating fluidized bed boilers Wear-resistant refractory materials can be divided into fixed materials and non-fixed materials according to their delivery conditions and can be divided into wear-resistant refractory materials (including bricks, castables, plastics, and mortars); refractory materials (including bricks, castables, mortar); refractory insulation materials (including bricks, castables, and mortar). typesetting material (1) Wear-resistant refractory materials (dense refractory materials): silica-alumina bricks (silicon bricks, refractory clay bricks, high-alumina bricks), zirconium-silicon bricks, non-composite bricks (carbon bricks, silicon carbon bricks), magnesium-calcium-chrome bricks and Electrolytic magnesia product categories (magnesia bricks, chrome-magnesia bricks, chrome bricks, dolomite bricks). (2) Insulation materials: refractory insulation bricks, insulation bricks, insulation blocks, ceramic fibers. Unshaped material Unshaped materials include castables, plastering materials, plastics, repair materials, spray gun materials, castables, vibrating materials, plastering materials, etc., and can be...
Rotary kiln lining brick is an important piece of equipment to ensure the continuity of cement clinker production. Therefore, if the rotary kiln is an important machine, then the refractory brick lining is the motor. However, when many cement factories build a new rotary kiln, the refractory bricks in the kiln will fall off, and they don’t know what to do. What is the reason? The main reason is that the refractory bricks are not locked during the masonry process. 1. Analysis of the causes of brick falling during the drying process of refractory bricks (1) Improper use of cement. During the masonry process, it is necessary to use refractory mortar to bond the refractory bricks built by the rotary kiln, and it is also necessary to use mortar to level the refractory bricks. When the mortar is applied unevenly, it is easy to cause the model ratio of the refractory bricks to be unbalanced, resulting in the brick surface tilting, and the size of the bricks being inconsistent. The use of mortar has a particularly prominent impact on winter construction. Due to the decrease in the ambient temperature, the fluidity of the refractory mortar becomes poor, and freezing occurs....
During the operation of the cement rotary kiln, faults such as egg accumulation, flying sand, snowman making, and ring formation often occur. These failures not only affect the operation of the kiln but also affect the service life of the lining refractory material. To solve these problems, it is necessary to clarify the formation mechanism of these faults and destroy the formation conditions of the faults, so as to achieve the purpose of high yield, high quality, and low consumption. Today we will talk about the ring formation problem of cement rotary kilns. The former and the latter are divided into three types. Among them, the most difficult to deal with is the rear ring. Use refractory materials to slow ring formation In order to slow down the formation of rings, in addition to controlling raw materials and fuels, improving the flammability of raw materials, improving combustion, adopting thin material quick-turn operations, and stabilizing thermal systems, refractory materials can also be used. The test results show that the sulfur-alkali ring can be relieved by using bricks containing SiC or ZrO2, the sulfur-alkali ring can be relieved by the use of magnesium aluminum spinel bricks and magnesia alumina spinel castables, and...
During the operation of the cement rotary kiln, faults such as egg accumulation, flying sand, snowman making, and ring formation often occur. These failures not only affect the operation of the kiln but also affect the service life of the lining refractory material. To solve these problems, it is necessary to clarify the formation mechanism of these faults and destroy the formation conditions of the faults, so as to achieve the purpose of high yield, high quality, and low consumption. Today we will talk about the ring formation problem of cement rotary kilns. The former and the latter are divided into three types. Among them, the most difficult to deal with is the rear ring. Rear Ring Problem The latter is the ring formed at the junction of the launch zone and the transition zone. The kiln back ring has a close relationship with the low melting point material in the kiln. It is also closely related to coal ash. Therefore, the latter ring is also called the pulverized coal ring. When materials in the transition zone enter the firing zone, they will be blocked by the kiln skin. Some materials stay for a certain period of time before entering...
During the operation of the cement rotary kiln, faults such as egg accumulation, flying sand, snowman making, and ring formation often occur. These failures not only affect the operation of the kiln but also affect the service life of the lining refractory material. To solve these problems, it is necessary to clarify the formation mechanism of these faults and destroy the formation conditions of the faults, so as to achieve the purpose of high yield, high quality, and low consumption. Today we will talk about the ring formation problem of cement rotary kilns. The former and the latter are divided into three types. Among them, the most difficult to deal with is the rear ring. front ring problem The front ring is the ring connected to the cooling zone. When the material in the kiln enters the cooling zone from the firing zone, a part of the clinker that cannot be completely solidified on the kiln skin is formed on the surface. If it is not dealt with in time, it will accumulate and develop into an anterior ring. Henan Xinhongji Refractory Material Co., Ltd. summed up some experience of ring forming before processing ①When the current ring-forming position is...
During the operation of the cement rotary kiln, faults such as egg accumulation, flying sand, snowman making, and ring formation often occur. These failures not only affect the operation of the kiln but also affect the service life of the lining refractory material. To solve these problems, it is necessary to clarify the formation mechanism of these faults and destroy the formation conditions of the faults, so as to achieve the purpose of high yield, high quality, and low consumption. Today we will talk about the ring formation problem of cement rotary kilns. The former and the latter are divided into three types. Among them, the most difficult to deal with is the rear ring. The problem with the sulfur-alkali cycle The sulfur-alkaline ring is a circle formed in the decomposition zone, which not only contains a large number of volatile components but also contains some characteristic minerals, such as 2c2s?CaSO4 and 2c2s?CaCO3. The formation mechanism of the sulfur-alkali ring is that a large number of volatile components act as binders. When C2S is stabilized or transformed into 2c2s?CaSO4 and 2c2s?CaCO3, the conversion of β-C2S-γ-C2S will not occur, and there will be no pulverization accompanying the conversion, and there is...
Fluidized furnace lining refractories are mainly composed of refractory bricks and monolithic refractories. The following are the construction methods of refractory bricks. The lining masonry of a fluidized furnace is mainly divided into two parts: wall and vault. 1. Refractory brick wall masonry. Before construction, use a theodolite to measure the center line of the furnace, re-measure the foundation elevation, and mark the height of the first layer of bricks on the furnace shell every 5 meters. Draw a layered line along the vertical direction as a reference for the furnace bottom and furnace wall masonry. All brickwork joints must be filled with adhesive (including joints between brickwork and steel shell and between brick layers), so all brickwork joints are filled without gaps and holes. And regularly check whether the position of the masonry after masonry is accurate. For multi-layer brick masonry floors, the total thickness of the brick walls must be checked. The required thickness of mortar joints should be 2mm as far as possible (tolerance ±1mm). A waterproof layer is set between the calcium silicate board, the high alumina insulating bricks, and the insulation refractory brick to prevent the absorption of solidified water. A plastered subfloor can be...
Refractories are the main components of glass melting furnaces, which have a decisive impact on glass quality, energy consumption, and product costs. The future of glass melting technology depends to a certain extent on the progress of refractory manufacturing technology and the improvement of product quality. Refractory materials commonly used in glass melting furnaces are divided into four categories: casting refractory materials, sintered refractory materials, amorphous refractory materials, and heat insulation refractory materials. Each type of material contains several species. The chemical composition, physical properties, dimensional error, and appearance types of refractory materials should meet the national standards or industry standards, and the latest revised version should be selected, otherwise, they cannot leave the factory. Silica bricks are widely used in glass-melting furnaces, and the main component is silicon dioxide (SiO2). Silica bricks used in glass melting furnaces require a SiO2 content of over 94%, a maximum operating temperature of about 1600~1650°C, and a density of 1.8~1.95g/cm3. The apparent porosity is required to be less than 22%, the larger the porosity, the worse the quality of the silica bricks. Silica bricks appear mostly white crystals, and the microcosmic composition is tridymite crystals. Since silica bricks undergo crystallization transformation at high...
Henan Xinhongji Refractory Material Co., Ltd. (Xinhongji Refractory) has agreed with an Indonesian customer to complete the business and the Alumina-based Wear-Resistant Ceramics business in the United States from Saint-Gobain SA on 30 November 2019. The Business represents a natural extension of Xinhongji Refractory’s longstanding win-win targets, whereby Xinhongji has been supplying technology for the manufacture of iron and steel refractory products. This is Xinhongji first started licensing technology for the production of the tap-hole mix for the Indonesian market. In recent years, Xinhongji has also developed several fresh refractory products for the market abroad for iron and steel, cement, and other industries. This business will penetrate the South Asia market for various industries by supplying Xinhongji Refractory with our own production base with well-established customer service networks.
Xinhongji Refractory could supply 3M-9.6M tunnel kiln construction planning and design, construction, commissioning, training, and system services. New technology uses ceramic fiber ceiling modules, with light, energy saving, high temperature, low energy consumption, and other characteristics; energy consumption within the contingent card number 280-320cal/kg, an insulating bricks efficiency of 20% -30%, an insulating brick 90% lighter load. Ceramic fiber modules greatly reduce steel load and significantly extend the service life of the kiln, for one hundred million annual output of 50 million new wall materials -1.2 automated production lines. The company provides construction services: feasibility reports, materials testing, test-fired brick, kiln design and kiln construction contractors, equipment design, installation and commissioning, technical training, service, and other comprehensive engineering services for customers a one-stop successful, simple, and convenient.
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