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Refractory castables for circulating fluidized furnaces are generally used at medium and low temperatures, and the operating temperature is within 600-1800 °C. So what kind of properties do refractory castables used in circulating fluidized furnaces need to have? The main overall properties of refractory castables are high-temperature resistance, wear resistance, high strength, heat preservation, thermal shock resistance, and other functions. Circulating fluidized bed boiler is the clean coal combustion technology with the highest degree of industrialization. The circulating fluidized bed boiler adopts fluidized combustion, and its main structure includes two parts: the combustion chamber (including the dense-phase zone and the dilute-phase zone) and the circulating furnace (including the high-temperature gas-solid separator and the return system). The biggest difference from the bubbling fluidized bed combustion technology is that the operating wind speed is high, which strengthens the heterogeneous reaction process such as combustion and desulfurization, and the boiler capacity can be expanded to a large capacity acceptable to the power industry. At present, circulating fluidized bed boilers have been very It solves basic problems such as thermal, mechanical, and material science as well as engineering problems such as expansion, wear, and overtemperature, and becomes the first choice for the energy utilization...
Due to different operating departments, even in different parts of the same kiln, the working conditions are not the same. Therefore, the requirements for refractory bricks are also different. Based on the general working conditions of ordinary industrial furnaces, the following requirements are put forward for the performance of refractory bricks: 1. Resist high-temperature heat load, no softening, no melting. Refractory bricks are required to have a relatively high degree of refractoriness. 2. Resist the effect of high-temperature heat load, the volume does not shrink and only expands uniformly. The material is required to have high volume stability, small residual shrinkage and residual expansion, no crystal transformation, and serious volume effect. 3. Resist the joint action of high-temperature thermal load and heavy load, without loss of strength, creep, and collapse. The material is required to have relatively high normal temperature strength and high-temperature hot state strength, high load softening temperature, and high creep resistance. 4. Resist sharp temperature changes or uneven heating, no cracking, no peeling off. The material is required to have good thermal shock resistance. 5. Resist the chemical erosion of molten liquid, dust, and gas, no deterioration, no erosion. The material is required to have good slag...
Xinmi is a city that belongs to Henan Province. There are many manufacturers in Xinmi, among which there are quite a few refractory factories in Xinmi. Today, let’s take a look at a better manufacturer of refractory castables – Xinhongji Refractory. Henan Xinhongji Refractory Material Co., Ltd. was established in 2015 with a registered capital of 5 million RMB. Located in Zhengzhou City, Henan Province, adjacent to the Beijing-Zhuhai Expressway and the Lianhuo Expressway, the Beijing-Guangzhou and Longhai Railways and high-speed railways pass through the city. The ruins of the Shang Dynasty in Zhengzhou, the ancient Shaolin Temple, the Longmen Grottoes in Luoyang, the hometown of the Yellow Emperor, and the Dragon Pavilion in Kaifeng are famous world-class sites. Surrounded by cultural landscapes, the long history and profound cultural heritage provide us with an elegant development environment. Our company has independent import and export management rights. After years of hard work, it has developed into a joint-stock company with high-tech industries as the leader, and multiple industries coexisting and developing. It integrates science, industry, trade, culture, service, transportation, and masonry. The company has become one of the bases for the production of medium and high-grade refractory materials at home and...
The prices of different refractory castables are different, ranging from hundreds to tens of thousands per ton. Wear-resistant castables are the most widely used branch of refractory castables. As long as the working environment of castables has high-temperature solid particles, dust, feeding materials or outlets, etc., the requirements for wear resistance will be stricter. It is necessary to select a suitable wear-resistant castable according to the operating temperature of the high-temperature kiln, temperature changes, chemical erosion, and other factors. How much is a ton of wear-resistant castable? This is a difficult question to quote accurately. Because there are many varieties of wear-resistant castables, as long as they have a certain medium and high-temperature strength and wear resistance, they can be called wear-resistant castables. Such as wear-resistant castables for boilers, steel fiber wear-resistant castables, corundum wear-resistant castables, corundum mullite castables, corundum silicon carbide castables, and other varieties, so here can only provide you with an approximate price, of 1800-4500 yuan/ton, this price is only a range price, including several products stated above. The density of lightweight thermal insulation castables is between 0.8—-1.6, and the price ranges from 1,500 to 8,000 yuan. The density of refractory castables is between 2.0–3.1, and the...
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: Properties of wear-resistant refractory materials Wear-resistant refractory material is a special product that is not easy to be damaged and deformed under high temperatures. In order to avoid damage from smoke and fly ash, wear-resistant materials are laid inside some vulnerable parts. The correct selection and installation of this wear-resistant material is particularly important. It guarantees the long-term characteristics of the system, reducing the frequency of shedding of wear-resistant materials and maintenance. The chemical composition of wear-resistant refractory materials is mainly composed of aluminum and silicon compounds, accounting for 80%-95% of the total content. In order to withstand the environmental hazards of circulating fluidized bed boilers, wear-resistant refractory materials must have certain refractoriness, compressive strength, flexural strength, thermal shock resistance, and a sufficiently small linear change rate. The main physical and chemical indicators of wear-resistant...
As early as a few years ago, with the continuous improvement of the technical level of the building materials industry and the continuous emergence of new refractory materials, the refractory industry has always maintained a trend of rapid growth. It is understood that refractory materials are indispensable basic materials in high-temperature industries. They are mainly used in high-temperature industries such as building materials, metallurgy, electric power, and petrochemicals. With the rapid growth of related industries such as steel and building materials, the domestic refractory industry has also achieved good results in rapid development. At the same time, manufacturers producing these high-performance refractory materials are also emerging, providing convenience for the use of various industries, such as high-alumina castable manufacturers, refractory brick manufacturers, etc. are constantly increasing, presenting a vibrant and promising future. Great scene, this is the most glorious time for refractory enterprises! But the good times don’t last long. Over the past few years, due to factors such as overcapacity in the refractory industry, low industrial concentration, poor independent innovation capabilities, low proportion of new refractory materials, and a single industrial structure, the development of refractory companies has been hindered, and supply exceeds demand. , the original market share...
Everyone has ideals and pursuits and has their own dreams. Now, everyone is discussing the Chinese dream. I think that realizing the great rejuvenation of the Chinese nation is the greatest dream of the Chinese nation since modern times. This dream embodies the long-cherished wish of several generations of Chinese people, embodies the overall interests of the Chinese nation and Chinese people, and is the common expectation of every son and daughter of the Chinese nation. History tells us that everyone’s future and destiny are closely linked with that of the country and nation. When the country is good and the nation is good, everyone will be good. China is an ancient civilization with a history of 5,000 years. It has a long history and profound culture. Metallurgy, glass, cement, ceramics, and other industries are indispensable inorganic non-metallic materials in high-temperature industries and also play an important role in high-temperature industries, which also lays a solid foundation for the development of refractory materials in my country. In recent years, my country’s refractory materials have developed rapidly, but the problems that have emerged are also clearly visible, such as overcapacity, low industrial concentration, weak environmental awareness, and slow capital return, which...
At present, the problem of “small, large and scattered” refractory enterprises in Henan Province still exists, lack of professional cooperation and division of labor, some enterprises’ technological innovation capabilities are not strong enough, equipment research and development level are not high enough, and key common technologies are still missing; innovation and development have not formed The overall collaborative platform does not yet have centralized and efficient R&D comprehensive capabilities and strong strength, and there are still outstanding common problems. With the policy support is given by governments at all levels to vigorously develop the refractory industry, relevant departments have removed the refractory industry from the “two high” project management catalog of Henan Province since 2023 after in-depth research and analysis. In this context, refractory companies in Henan Province still need to think rationally, conduct in-depth research on the issue of differentiated development of industries and products, never blindly expand the production capacity of the refractory industry, and strictly prevent the development of disorderly expansion and vicious competition. The suggestions are as follows: First, under the guidance of government departments at all levels, joint industry associations and other organizations should vigorously publicize and guide refractory enterprises in the province to conduct...
At present, my country is the world’s largest producer, consumer, and exporter of refractory materials, accounting for more than 65% of the world’s total refractory production. The products involve high-temperature industries such as steel, building materials, metallurgy, cement, and glass, and are indispensable in high-temperature industries. It is an inorganic non-metallic material that occupies a certain market position in my country’s industry, which is enough to see its importance to the high-temperature industry. Looking back on the past, the glory of the refractory industry has enabled my country’s refractory enterprises to make rapid progress, and at the same time, it has also driven the development of my country’s economy. The entire refractory industry is full of vitality and has a bright future. At this time, many people saw the business opportunities in this industry and started to set up refractory material enterprises to engage in the refractory material business, which also laid a solid foundation for the development of my country’s refractory material industry. Looking at today, the refractory industry is in a mess everywhere, and the benefits have plummeted. Nowadays, my country’s refractory material industry is in a downturn, and many refractory material companies are in a state of...
How is the refractory industry market? Relying on the advantages of upstream raw materials, my country has occupied first place in refractory production for many years, accounting for about 65% of the world’s total, and its production trend is also closely related to the steel industry. From 2013 to 2017, reforms on the supply side continued Under the background of in-depth promotion, the demand for refractory materials has been declining all the way, even falling below the 20 million tons mark. In the past five years, the output has been relatively stable and rising steadily. Any material whose physical and chemical properties allow it to be used in a high-temperature environment is called a refractory material. Refractory materials are widely used in metallurgy, the chemical industry, petroleum, machinery manufacturing, silicate, power, and other industrial fields, and are used in the largest amount in the metallurgical industry, accounting for 50% to 60% of the total output. The technological development of major users of refractory materials such as steel, cement, glass, nonferrous metals, and other industries has put forward higher quality and variety requirements for refractory materials, especially the variety structure adjustment and technological progress of the steel industry, and the output...
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