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A circulating fluidized bed boiler is a kind of high-efficiency and energy-saving boiler equipment. It uses circulating fluidized bed technology to burn fuel under high temperatures and high pressure environments. Refractory materials are used when building circulating fluidized bed boilers to ensure They can withstand the high temperature when the boiler is running, so the selection of refractory materials is very important, so what refractory materials are needed for the construction of circulating fluidized bed boilers, today I will take you to understand. 1. High alumina refractory bricks. The high-temperature area inside the circulating fluidized bed boiler needs to use high-alumina refractory bricks to resist high-temperature corrosion and erosion. Sometimes the temperature can reach thousands of degrees. High-temperature resistance and corrosion resistance, able to withstand the impact and corrosion of high-temperature combustion gas in circulating fluidized bed boilers, we need to choose according to the used parts and choose suitable high-alumina refractory bricks for different parts for masonry. 2. Silicate refractory bricks. Silicate refractory brick is one of the main refractory materials for circulating fluidized bed boilers. Its main component is silicate. Silicate refractory brick has excellent high-temperature resistance, wear resistance, and alkali resistance, and can withstand circulating fluidized Impact...
The refractory ball is a kind of spherical refractory material made of industrial alumina and refractory kaolin after a certain scientific ratio and fired at high temperatures. A kind of fire-resistant ball, which has the characteristics of high strength, high hardness, high wear resistance, etc., so what occasions are high-alumina fire-resistant balls generally used in, today I will give you a brief introduction to the use of high-alumina fire-resistant balls. Refractory balls are divided into ordinary refractory balls and high-alumina refractory balls. Ordinary refractory balls are suitable for converters and converters in the sulfuric acid and fertilizer industries. High-alumina refractory balls are suitable for hot blast stoves and heating converters in urea, steel, and other industries. As a refractory material, high alumina refractory balls are widely used in ceramic firing, enamel firing, glass firing, chemical, and other factories due to their small size, high temperature, corrosion resistance, and pollution-free. They are mainly stacked in industrial kilns and can achieve the effect of heat storage. Due to the high-temperature resistance of the refractory ball, its highest refractory temperature can reach about 1900 degrees, so it is also especially suitable for high and low-temperature conversion furnaces, reformers, hydrogenation converters, desulfurization tanks and...
The traditional masonry method of chimney lining is to use acid-resistant cement and acid-resistant bricks for masonry. Nowadays, the proportion of pouring and masonry using light acid-resistant castables is constantly increasing. However, in the masonry mode of acid-resistant brick masonry, the problem of full horizontal and vertical joints of bricks will make the airtightness of the masonry poor, and the heat insulation castable of the heat insulation layer will become damp, which will cause the heat insulation performance to decline. The breakage of heat-insulating castables and the loose combination of bricks and bricks will cause corrosive fumes to penetrate the masonry and insulation layer and corrode the outer cylinder wall. It is very inconvenient to construct the chimney with heat-insulating castables and lining bricks. Practical problems such as the installation of heat-insulated castables, the treatment of gaps between bricks, and moisture-proof measures seriously affect the chimney’s years of use. If the heat-insulating castable and the lining of the anti-corrosion brick masonry are combined into one, light or ultra-light acid-resistant castables with strong corrosion resistance, good heat insulation, and high strength are used to make lightweight castables by pouring. High-quality acid-resistant castable lining, heat insulation performance, and anti-corrosion performance are combined,...
Refractory brick is a kind of refractory material used to build smelting furnaces and combustion kilns. It is made of refractory clay or other refractory raw materials. It can withstand high temperatures of more than 1700 degrees. The size of refractory bricks is very large. Choose according to different use environments. Generally speaking, refractory bricks can be divided into shaped refractory bricks and unshaped refractory bricks. Shaped Refractory Brick Shaped refractory bricks are generally fixed in size, also known as general-purpose refractory bricks. General-purpose refractory bricks are divided into five types: straight bricks, thick wedge-shaped bricks, vertical thick wedge-shaped bricks, vertical wedge-shaped bricks and arch-foot bricks. It is generally used for the masonry of right-angled walls and radial walls of thermal equipment in industrial kilns. Usually, the common specifications of shaped refractory bricks are G-shaped bricks and T-shaped bricks. 1. The common straight bricks in our daily life are: 230*114*65mm, 230×150×75mm, 345×150×75mm, 230×150/135×75mm, 345×150/130 ×75mm, 230×150/120×75mm, 345×150/110×75mm. 2. The common sizes of wedge-shaped refractory bricks that are common in our daily life are: 114×65/35×230mm, 114×65/45×230mm, 114×65/55×230mm, 114×55/45×230mm, 114× 75/45×230mm, 114×75/55×230mm, 114×75/65×230mm, 114×70/60×230mm, 114×85/55×230mm, 114×80/50×230mm. 3. The common sizes of arch foot bricks in our life are: 132×114×230×33mm, 199×114×230×84mm, 199×114×230×36mm, 266×230×114×67mm,...
High alumina bricks have been widely used in the construction of various industrial kilns because of their special fireproof performance. However, due to its different performance from other bricks, it also has its own unique aspects that need to be paid attention to on the wall. High alumina brick lining can be divided into four categories according to the brick joint size and fineness level. The type and size of brick joints are Grades I ≤ 0.5mm; Grade II ≤ 1mm; Grade III ≤ 2mm; Grade IV ≤ 3mm. The mortar joints of the brick joints should be filled with fireproof mud, and the joints of the upper and lower bricks should be staggered. First: The preparation of wall refractory mortar should follow the following principles: 1. Pre-test and pre-pave various refractory mortars before building walls to determine the bonding time, initial setting time, consistency, and water consumption of different mortars. 2. Different slurries need to be made with different instruments and should be cleaned immediately. 3. Different mortars should be mixed with clear water, the amount of water should be accurate, the mixing should be even, and it can be used at any time. The prepared hydraulic and pneumatic...
G-size refractory bricks belong to the size of blast furnace products. The general materials are high alumina and clay. Products of various materials can be customized, such as: clay, high alumina, silicon, corundum, mullite, etc., to meet the needs of blast furnaces. Requirements for the use of refractory bricks. G1-G8 are blast furnace refractory bricks. Commonly used are high alumina bricks and clay bricks. The following is the standard introduction of G series bricks G1: 230*15*75(mm) G2: 345*150*75(mm) G3: 230*150*135*75(mm) G4: 345*150*130*75(mm) G5: 230*150*120*75(mm) G6: 345*150*110*75(mm) G7: 230*150*90*75(mm) G8:345*150*90*75(mm) There are many kinds of blast furnace refractories. Generally speaking, clay bricks or high alumina bricks with excellent functions are used in the middle and upper parts of the furnace body, while special refractory materials such as carbon products, silicon carbide bricks, mullite bricks, and corundum bricks are used in the lower part of the furnace body. The waist and belly of the furnace body, especially the recently produced silicon carbide bricks, have been successfully used in blast furnaces. At the same time, other unshaped refractory materials have also been widely used. When building wall blast furnaces, hot blast furnaces, or lime kilns, the cooperation of the two brick types allows...
Refractory cement is a special type of cement with high refractory performance, which is widely used in fields under high-temperature environments such as construction engineering, metallurgical industry, and chemical industry. Refractory cement is not only a building material, but also a key protective material that can effectively deal with problems such as high temperature, corrosion, and damage. Many people will pay attention to the price of refractory cement before choosing refractory cement. The price of refractory cement is affected by many factors such as brand, specification, and purchase volume. Therefore, there is no fixed answer to how much a pack of refractory cement costs, but a specific evaluation based on the actual situation. Take duck brand refractory cement as an example, the weight of each package of refractory cement is 50kg, and the price per ton is about 3200-3800, so the price of duck brand refractory cement is about 160-190 yuan per package, but according to the purchased model Unlike the quantity, the price must fluctuate. The price of different brands of refractory cement may vary. Refractory cement of some well-known brands is generally more expensive due to its reputation and quality assurance. And some unknown brands or refractory cements...
High-temperature refractory cement is a refractory building material specially designed for high-temperature applications, also known as aluminate cement. In many industrial fields and special engineering projects, the requirements for materials at high temperatures are relatively strict. This article will deeply discuss the application of high-temperature refractory cement in high-temperature environments and its functional characteristics. First, application fields of high-temperature refractory cement Due to its unique functional characteristics, high-temperature refractory cement has been widely used in many industrial fields. 1. Metallurgy field High-temperature refractory cement plays an important role in the metallurgical industry. The erosion of high-temperature, high-temperature alkaline, and acidic substances in the smelting process has high requirements on materials. The application of high-temperature refractory cement can effectively resist the high-temperature corrosion of the furnace and the erosion of alkaline substances, and prolong the service life of the equipment. 2. Chemical field In chemical enterprises, many technological processes require high-temperature conditions, which put forward higher requirements for the high-temperature resistance of building materials. The application of high-temperature refractory cement can effectively prevent corrosion and corrosion of chemical substances, and play an important role in ensuring the safe operation of equipment. 3. Glass and ceramic field High-temperature furnaces are indispensable equipment...
The melting furnace usually refers to the machine side furnace, which is placed next to the casting equipment to melt the alloy ingot and keep it warm, and the capacity is not more than 500 kg. Abbreviation for “fire nozzle”. Usually refers to the body part of the combustion device, which has a fuel inlet, air inlet, and ejection holes, which play the role of distributing fuel and combustion-supporting air and ejecting them in a certain way before burning. So what castables are used for the melting furnace burner? First of all, the temperature of the flame emitted by the burner is very high, so when choosing refractory materials, it is necessary to meet the requirements of high-temperature resistance. Secondly, the burner is easily damaged by the continuous erosion of natural gas and air, so it must have high strength and The erosion resistance, and finally the thermal shock resistance, that is, the resistance to rapid cooling and rapid heating, must be good, because the burner is in the studio, and the thermal stress generated is strong and easy Make the burner bricks crack and peel off, shortening the service life. In order to meet the above working conditions,...
The first-grade high-alumina brick is a kind of high-alumina refractory brick with an alumina content of not less than 75%. It is mainly used for masonry blast furnaces, hot blast stoves, electric furnace roofs, blast furnaces, reverberatory furnaces, and rotary kiln linings. The specific gravity of high alumina brick is about 2.5, the weight is about 4.3-4.4KG, the compressive strength is 70Mpa, and the refractory temperature can reach 1790 degrees Celsius. The specific gravity of the first-grade high-alumina brick is mainly affected by the density and porosity of the material. The high-alumina brick has a high density, which can ensure its compressive strength and fire resistance. The porosity refers to the proportion of the pores in the material to the total volume. Percentage, first-grade high-alumina bricks have strict requirements on porosity because excessive porosity will affect the strength and fire resistance of bricks, therefore, a series of technological measures need to be taken when producing first-grade high-alumina bricks to ensure that the bricks The density and porosity of the block meet the standard requirements, so the difference in the production process and production environment of each manufacturer will also lead to the difference in the specific gravity of the high...
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