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Thermal expansion and cold contraction: When the boiler is running, the refractory bricks are alternately affected by high temperature and cooling, and are prone to thermal expansion and cold contraction, causing the gaps between the bricks to become larger, causing the refractory bricks to loosen and fall off. Chemical erosion: The acidic gas or chemical substances produced when the fuel is burned in the boiler will corrode the refractory bricks, causing them to gradually loosen and cause them to fall off. Mechanical damage: During the operation of the boiler, mechanical damage such as vibration or impact may occur, causing the refractory bricks to be damaged or fall off. Dealing with fallen refractory bricks usually requires the following measures: Inspection and repair: Regularly check the refractory bricks inside the boiler, and promptly repair or replace any damaged or loose bricks. Reinforced support: Reinforce the supporting structure on the upper part of the refractory bricks to reduce the possibility of the bricks loosening and falling off due to thermal expansion and cold contraction. Control the fuel composition: Try to control the fuel composition and combustion process to reduce the chemical erosion of the refractory bricks. Repair or replace: Refractory bricks that have...
High alumina bricks and silica bricks may differ in fire resistance and chemical composition, so do not mix them. High alumina bricks and silica bricks are two common refractory materials, each of which has some characteristics: High alumina bricks 1. High alumina bricks are mainly composed of alumina as the main component, and usually contain between 50% and 80% aluminum, so they have high fire resistance and wear resistance. 2. It has excellent high-temperature resistance and can withstand the effects of high-temperature environments without losing stability. 3. It has good corrosion resistance and is suitable for acidic or alkaline environments. 4. Usually used as lining materials for high-temperature environments such as linings of high-temperature industrial equipment, metallurgical furnaces, and glass kilns. Silica bricks 1. Silica bricks mainly comprise silicate as the main component and have a high silicon content. Commonly used components include silica and alumina. 2. It has good wear resistance and acid and alkali resistance, but compared with high alumina bricks, its high-temperature resistance is poor. 3. Suitable for use in general building materials, such as heat insulation, thermal insulation, firewalls, and other low-temperature or normal-temperature environments. 4. In general, high alumina bricks are suitable for use in...
Refractory bricks for ceramic rotary kilns need to meet the following requirements: High-temperature performance: The operating temperature of the ceramsite rotary kiln is relatively high, so the refractory bricks are required to maintain their shape and performance at high temperatures without softening, melting, or deformation. Thermal shock resistance: Due to temperature changes in the ceramsite rotary kiln, refractory bricks are required to have a certain thermal shock resistance to cope with the effects of temperature changes. Wear resistance: The refractory bricks in the ceramic rotary kiln need to withstand the high-speed flow and friction of materials, so they are required to have sufficient wear resistance to prevent excessive wear. Chemical stability: The refractory bricks in the ceramic rotary kiln need to be in contact with a variety of chemicals, so they are required to have excellent chemical stability to prevent erosion. Strength: Refractory bricks need to have a certain strength to withstand the pressure and friction within the kiln. Dimensional stability: The dimensions of refractory bricks need to remain stable to ensure the masonry quality and service life of the kiln. Environmental protection: Environmentally friendly materials should be selected for refractory bricks used in ceramsite rotary kilns to reduce the...
The main function of adding zirconia to corundum bricks is to enhance their performance and durability. Zirconia is an important refractory material with various characteristics: High melting point: Zirconia has a high melting point, about 2700 degrees Celsius, allowing it to maintain stability in high-temperature environments. Excellent heat resistance: Due to its high melting point and thermal stability, zirconia is often used in high-temperature industrial applications, such as refractory materials, thermal insulation materials, etc. Excellent chemical stability: Zirconia has good corrosion resistance to chemicals such as acids and alkalis, making it widely used in the chemical industry. High hardness: Zirconia has a high hardness, close to steel, giving it good wear resistance in friction and wear environments. Excellent electrical properties: Zirconia is a dielectric with good insulation properties and is widely used in the insulation layer of electronic devices. Biocompatibility: Zirconia is widely used in the medical field because it has good compatibility with biological tissues and is suitable for use in medical devices such as human bone repair. High refractive index: Zirconia has a high refractive index, which makes it widely used in the optical field, such as optical lenses, laser devices, etc. Overall, zirconia is a multifunctional material...
There are several main ways to burn garbage fuel. Today we mainly introduce solid bed combustion and fluidized bed combustion. For different combustion methods, different types of refractory materials need to be selected. Solid bed combustion: During the solid bed combustion process of garbage, the fuel presents a static state in the furnace. This combustion method requires selecting refractory materials that can withstand high temperatures, and resist corrosion and wear, such as high-alumina refractory bricks, magnesia-aluminum refractory materials, silicon carbide ceramic materials, etc. Fluidized bed combustion: During the waste fluidized bed combustion process, the fuel is suspended in the furnace by the airflow and moves with the airflow. This combustion method requires selecting refractory materials that are resistant to wear, corrosion, and high temperature, such as high-aluminum refractory bricks, potassium aluminosilicate refractory materials, etc. In addition, factors such as the chemical composition, physical properties, and moisture content of waste fuel also need to be considered when selecting refractory materials. For example, if the garbage fuel contains high concentrations of elements such as sulfur and chlorine, you need to choose refractory materials with good corrosion resistance. If the moisture content of the waste fuel is high, refractory materials with good temperature...
Low creep and resistance to spalling are two important performance indicators of refractory bricks, and their meanings are as follows: Low Creep: Creep refers to the continuous deformation of materials caused by stress under high temperatures for a long time. In a high-temperature environment, refractory bricks will be affected by thermal stress, and creep is the continuous deformation of the brick material under the action of this stress. Low creep means that refractory bricks can maintain small deformation when used at high temperatures for a long time, reducing adverse effects on the kiln structure. Spall Resistance: Spall resistance refers to the ability of refractory bricks to resist peeling or chipping caused by thermal shock at high temperatures. Inside the kiln, due to high temperatures and thermal cycles, refractory bricks will withstand stress caused by thermal expansion and contraction and are prone to peeling or chipping. Refractory bricks with good spalling resistance can effectively resist such spalling and chipping, maintaining the integrity and stability of the lining. Low creep and resistance to spalling are important performance indicators of refractory bricks when used for a long time in high-temperature environments. Good refractory bricks should have low creep and good spalling resistance to...
Microporous insulation is a material with a tiny pore structure used to insulate heat transfer. This material has many advantages that make it popular in many applications. Here are some of the benefits of microporous insulation: Excellent thermal insulation performance: The tiny pores of microporous insulation materials can effectively prevent the transfer of heat, thus providing a good thermal insulation effect. They reduce heat conduction and radiation, making them very effective in the field of insulation and insulation. Lightweight: Microcellular insulation is typically made from lightweight materials, so its density is relatively low. This allows these materials to reduce structural loads in insulation and insulation applications while also making installation and handling easier. Good pressure resistance: Although microporous insulation materials are lightweight, they can have good pressure resistance and can withstand certain mechanical loads without losing the insulation effect. Superior corrosion resistance: Some microporous insulation materials have good corrosion resistance and can remain stable in harsh chemical environments. Flexibility and ease of cutting: Microcellular insulation can often be easily tailored, cut, and machined to fit surfaces of various shapes and sizes, making them suitable for different applications. Environmentally friendly and sustainable: Many microcellular insulation materials are made from environmentally friendly...
Aluminum chromium zirconium bricks and chromium zirconium bricks are refractory materials used in high-temperature kilns, especially glass ones. They are mainly used in kiln linings, furnace walls, and other parts and need good high-temperature, corrosion, and thermal shock resistance. Here are some characteristics of both materials: Aluminum Chromium Zirconium Brick 1. Containing high aluminum, chromium, and zirconium elements, it has high corrosion resistance and thermal shock resistance. 2. It has good high-temperature resistance and is suitable for high-temperature processes such as glass kilns. 3. Usually has good thermal conductivity and mechanical strength. Chrome Zirconium Brick 1. Containing chromium and zirconium elements, it also has certain high-temperature resistance and corrosion resistance. 2. It can be used in some high-temperature processes, but compared to aluminum-chromium-zirconium bricks, its performance may be slightly inferior under some specific conditions. 3. The choice of aluminum-chromium-zirconium bricks or chromium-zirconium bricks should be considered based on the specific process conditions and use environment. Generally speaking, if the process temperature is higher, a strong corrosive atmosphere exists, and better thermal shock resistance is required, aluminum chromium zirconium bricks may be a better choice. If used in a relatively low-temperature range, or if the requirements for corrosion resistance are more...
Refractory material is an inorganic non-metallic material that can withstand high temperatures. It is usually used to manufacture high-temperature equipment such as industrial kilns and heating furnaces. The main components of refractory materials include refractory aggregates, powders, and binders. There are many types of refractory materials, which can be selected according to different high-temperature application scenarios. The main performance indicators of refractory materials include refractoriness, load softening point, high-temperature creep value, thermal expansion coefficient, thermal conductivity, slag resistance, etc. Among them, refractory degree refers to the temperature in degrees Celsius at which a conical sample of refractory material can resist the action of high temperature without softening and melting without load. When refractory materials are used at high temperatures for a long time, they will be corroded by high temperatures, air, slag, etc. Therefore, measures need to be taken for maintenance and repair. For example, regularly replace damaged refractory materials, use high-temperature protective agents, etc. Refractory materials are divided into shaped refractory materials and unshaped refractory materials. Shaped refractory materials generally refer to refractory bricks, whose shapes have standard rules and can also be temporarily processed during masonry construction as needed. Refractory bricks line furnaces, kilns, fireboxes, and fireplaces. Refractory...
Steel rolling heating furnaces usually use high refractory materials to withstand high temperature and thermal cycle environments to ensure that the heating process in the furnace is stable and continuous. The following are some common refractory materials used in steel rolling heating furnaces and related precautions: Refractory bricks: Refractory bricks such as high alumina bricks, quartz bricks, and silicon carbide bricks are often used inside rolling steel heating furnaces because they have good high-temperature resistance and chemical stability. Take care to select refractory bricks that are suitable for specific operating conditions, as different furnace temperatures and thermal cycle requirements may vary. Refractory insulation: Refractory ceramic fibers or graphite fibers are often used as linings or insulation to reduce heat loss and improve energy efficiency. These fibrous materials can maintain their insulating properties at high temperatures but require careful handling to prevent the fibers from fraying and drifting. Refractory coatings: Some refractory coatings can be used to protect furnace walls and bottoms to increase the life and performance of the refractory materials. These coatings can increase the wear and corrosion resistance of the surface. Precautions a. Temperature control: Ensure that the temperature and heating process in the furnace are well controlled...
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