News-Luoyang Junwei Refractory Materials Co., LTD

Scientists Challenging Fire

Li Nan, a professor at Wuhan University of Science and Technology, has been engaged in research and teaching of refractory materials for more than 40 years. He has made significant contributions to the progress and innovation of refractory materials technology in China and is one of the important representatives of China in the international refractory materials field. He has won one second prize for national technological invention, three second prizes for national scientific and technological progress, and one third prize for national scientific and technological progress.Refractory materials are widely used in high-temperature industrial production processes in various fields such as steel, non-ferrous metals, cement, glass, ceramics, chemical industry, machinery, and electricity. Without excellent refractory materials, the advantages of high efficiency, energy saving, and low pollution of new kiln technologies cannot be achieved.At present, China's refractory material production accounts for about 65% of the world's refractory material production, but the basic theoretical research on refractory materials is relatively lagging behind. The proportion of high-quality refractory materials such as functional, long-lasting, energy-saving, and environmentally friendly is still low, and there are few significant original innovations.As an academic highland in the field of refractory materials research, Wuhan University of Science and Technology has gathered a group of world-renowned experts. For nearly half a century, Professor Li Nan has been dedicated to research in this field. Since 1996, he has led a team that focuses on major, common, and critical technologies in the industry, and has begun to break through the theoretical and research of microstructure control technology and industrial applications in the preparation process of high-quality refractory materials.In modern high-temperature industrial production processes, the key technology is to develop high-quality refractory materials that can withstand higher temperatures, stronger chemical erosion, more severe mechanical damage, and high insulation efficiency.The relationship between high-quality refractory materials and high-temperature production can be metaphorically described as "a good pot makes good dishes": a good pot is not afraid of erosion, durable, and does not contain toxic or harmful substances, ensuring the safety of stir fried dishes; In addition, a good pot heats up quickly, saves gas, improves thermal efficiency, and reduces energy consumption.Taking steel production as an example, in the case of low requirements for steel quality, people pursue the goal of longevity and low consumption of refractory materials, and do not pay enough attention to the interaction between molten steel and refractory materials. With the development of the industry and technological progress, the requirements for steel performance are becoming increasingly strict. The invention of a high-quality refractory material to solve the pollution of refractory materials on molten steel has become the key to clean steel production.After more than 10 years of dedicated research, Professor Li Nan and others have obtained a new technology for microstructure control of refractory materials with independent intellectual property rights. This not only reduces production costs, but also improves the comprehensive performance of refractory materials and extends their service life. The refractory materials developed and produced using new technologies have achieved or exceeded the performance level of similar imported products from abroad, enhancing the competitiveness of China's refractory products in the international market.The new product has been widely applied in dozens of large and medium-sized steel, cement, and refractory material enterprises in China, such as Wuhan Iron and Steel and Luquan Iron and Steel. In the past three years, 11 refractory material production enterprises have increased their production value by more than 3 billion yuan and added direct economic benefits of over 600 million yuan, promoting technological breakthroughs in China's refractory material industry and energy conservation and emission reduction in high-temperature industries.

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2023-07-10

Research on the Application of Vacuum Insulation Board Insulation Materials

1、 Overview of Vacuum Insulation Board1. Development OverviewVacuum insulation board is a board formed by placing a core material with good insulation performance into a gas barrier structure, vacuuming it, and then sealing it together. The research and development of VIP board began in the 1950s, and has a history of nearly 60 years. At first, powdered silica was used as the core material, and in the 1970s, open cell foam was used. After the 1990s, many large companies in Europe and America conducted research on VIP boards and achieved rich scientific research results. Nowadays, VIP boards have been widely used in refrigerators, freezers, cold storage facilities, refrigerated trucks, refrigerated containers, medical insulation boxes, wall insulation and other fields both domestically and internationally. For example, in Japan, more than 70% of household refrigerator insulation layers use VIP boards, and in Europe and America, VIP boards have been widely used in transportation insulation boxes for refrigerated vehicles and ships.2、 Research on the Application of Vacuum Insulation Board1. Thermal insulation effectIn order to accurately evaluate the thermal insulation effect of the vacuum insulation board, we specially made a set of molds to form the square box, and compared the thermal insulation performance of the vacuum insulation board and the common thermal insulation material, rigid polyurethane foam.The two boxes have exactly the same size, with an external dimension of 40cm * 40cm * 44cm, a wall thickness of 4cm for the insulation layer, and a wall thickness of 7cm for the box cover. One of them is made of pure PU foam, and the other has a VIP board with a thickness of 1cm embedded on the inner wall and then made of PU foam. During the experiment, two boxes were filled with identical cold sources. Place the box in a constant temperature and humidity testing machine, set the testing machine temperature to 40 ℃, and now set the humidity to 50%. Then measure the continuous temperature change curve inside the box as follows:(1) During the 48 hour observation period, the cooling rate of the box with VIP board was faster than that of the box with pure PU, and the lower equilibrium temperature inside the box was much lower than that of pure PU. This indicates that the use of VIP board in the experiment can greatly improve the cooling rate, reduce the waiting time for work, and achieve the same temperature preservation effect. The number of cold sources used is much less than that without VIP board.(2) The box with VIP board has a slower reheating speed than the box with pure PU, indicating that the use of VIP board can extend the cooling time.Therefore, using VIP boards to accelerate cooling speed and reduce waiting time for tasks; Reduce the temperature recovery rate and extend the cooling time; Under the premise of ensuring the same insulation effect (www.cnbaowen. net), it can greatly reduce energy consumption.Many large foreign companies are constantly developing VIP board products to improve the quality of VIP boards, while also conducting extensive in-depth application research. Dow Chemical Company has conducted the following experiments to quantitatively analyze the economic benefits of using VIP boards.2. Application processAlthough VIP boards have excellent thermal insulation performance, due to their structural characteristics and production processes, they have the following characteristics in practical applications.(1) The VIP board has a unique structure and cannot be cut and processed into various specifications and shapes during application. The product specifications and dimensions can only be determined in advance based on the application situation(2) The air barrier structure of VIP boards usually uses multi-layer polyester based films, which are prone to scratches and damage. Therefore, in practical applications, VIP boards usually require additional protective devices;(3) After the VIP board barrier film is strongly stretched, the film is prone to thinning, producing pores, or damaging the sealing edge. Therefore, VIP boards should not be bent or used on curved surfaces with too small a curvature radius;(4) The edges of VIP boards are usually not very flat, so there is a large gap when the boards are spliced together. Therefore, VIP boards are often used as panels in combination with conventional insulation materials such as rigid polyurethane foam to fill the splicing gaps and prevent heat leakage;(5) Due to limitations in production equipment, the finished area of VIP boards in China is generally within 2 square meters. When applied to large wall surfaces such as cold storage, refrigerated containers, and walls, connectors are often needed to connect them into a large flat surface;In response to the above-mentioned defects of VIP boards, corresponding protective measures must be taken in practical applications to solve them:(1) Paste the VIP board with adhesive on the inside or outside of the insulation space of the refrigerated incubator, and then pour polyurethane solution into the insulation space to foam as a whole. The foam fills each space in the insulation cavity and tightly wraps the VIP board.(2) Place the VIP board in the rectangular box mold and inject polyurethane stock solution for foaming. In this way, the polyurethane foam tightly wraps around the VIP board. After the mold is opened, a block composite board of polyurethane and VIP board is formed;Luoyang Dahang Refractory Materials Co., Ltd

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2023-07-10

Building insulation board system

This material can be used in both civil and commercial buildings, and is a high-performance material for walls, floors, and roofs. The middle of the board is polystyrene foam or polyurethane foam sandwich layer, which is generally 120~240mm thick. Different flat surface layers can be used on both sides as required. For example, engineering plywood wood products can be used on both sides of the building.Buildings constructed with this material have the characteristics of high strength, good insulation effect, low cost, simple construction, energy conservation, and environmental protection. SIPS is generally 1.2m wide, and if it is large, it can be up to 8m long, with a series of sizes available. Many factories can also customize and supply complete sets according to the actual size of the project. Contractors only need to assemble them on the construction site, truly realizing the industrialization of residential production.

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2023-07-10

High temperature resistant coatings, heat-resistant and energy-saving, achieving a double harvest during the National Day holiday

The non regeneration and sustainable use of energy, coupled with the dual contradiction between energy and environmental pollution, have limited impacts on the rapid development of industries such as steel and ceramics. Energy conservation, consumption reduction, and emission reduction are inevitable choices for technological progress and sustainable development of enterprises. .The non renewable and sustainable use of energy, coupled with the dual contradiction between energy and environmental pollution, have limited impacts on the rapid development of industries such as steel and ceramics. Energy conservation, consumption reduction, and emission reduction are inevitable choices for technological progress and sustainable development of enterprises.Industrial kilns are key equipment for industrial heating, widely used in high-temperature industries of the national economy. Industrial kilns are also major energy consumers, accounting for 25% of the total national energy consumption and about 60% of the total industrial energy consumption. In the energy-saving process of industrial kilns, in addition to heat source transformation, sintering process transformation, combustion process transformation, and kiln structure transformation, the performance of refractory materials and kiln furniture refractory materials used in kilns has a decisive impact on the energy-saving effect of industrial kilns. Industrial refractory insulation materials include refractory fibers, refractory castables, refractory high-temperature insulation coatings (Zhisheng brand), lightweight refractory bricks, A1302 hollow sphere bricks, magnesia bricks, and other refractory insulation materials for kiln lining. The heat consumption in industrial kilns can be basically decomposed into several parts, including the heat absorbed by the product, the heat absorbed by the kiln furniture, the heat carried away by the flue gas, the heat absorbed by the kiln wall and kiln car, and the heat lost by the kiln body. Among them, the heat only used for product absorption is the effective energy. The energy utilization rate in our country is relatively low, with an average thermal efficiency of 30% for industrial kilns, including 5% to 20% for forging kilns and 8% to 25% for heat treatment kilns. The thermal efficiency of continuous heating kilns and tunnel kilns is slightly higher, only 30% to 55%, which is significantly lower than the international average thermal efficiency of over 50% for industrial kilns.To cope with the severe challenges of the energy situation, energy conservation and consumption reduction in industrial kilns are inevitable trends in development. The energy-saving of industrial kilns is closely related to the technological progress of kiln lining refractory materials, kiln technology design, and construction. The energy-saving effect of kiln lining refractory materials in industrial kilns is achieved through the combination of various kiln lining refractory materials and thermal insulation materials, using integrated lightweight refractory materials as the structural material of the kiln body to reduce heat dissipation and heat storage losses and achieve energy-saving goals. There are multiple ways to combine kiln lining refractory materials with thermal insulation materials. From the perspective of heat transfer, several different thermal conductivity kiln lining refractory material structural combinations are calculated and analyzed, including changes in heat flux density and external surface temperature. In order to optimize industrial furnace lining refractory materials, according to different kiln usage analyses, Zhisheng's ZS-1 refractory high-temperature thermal insulation coating is the best in preventing heat conduction and saving energy.

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2023-07-10

New refractory material protective coating increases kiln life by three times

Summary: High temperature kiln refractory materials include insulation bricks, castables, metals, ceramics, refractory fibers, quartz sand, silicon carbide, quartz glass, etc. High temperature kiln refractory materials should have characteristics such as high temperature resistance, oxidation resistance, corrosion resistance, erosion resistance, high strength, flexural resistance, and stable expansion coefficient at high temperatures, resulting in relatively high loss rates.High temperature kiln refractory materials include insulation bricks, castables, metals, ceramics, refractory fibers, quartz sand, silicon carbide, quartz glass, etc. High temperature kiln refractory materials should have characteristics such as high temperature resistance, oxidation resistance, corrosion resistance, erosion resistance, high strength, flexural resistance, and stable expansion coefficient at high temperatures, resulting in relatively high loss rates. After long-term operation at high temperatures, the refractory materials of high-temperature kilns are prone to characteristics such as embrittlement, cracking, detachment, aging, and poor thermal insulation, which pose significant safety hazards and result in serious energy losses for kiln operation. Kilns cannot be stopped for maintenance, and the economic losses are quite severe. The ZS-1022 kiln lining protective coating, which has been developed and produced by Beijing Zhisheng Weihua Chemical Co., Ltd. for many years, is made by using Zhisheng Weihua's special high-temperature film-forming solution, and high-speed dispersion and polymerization of high-temperature resistant inorganic materials such as ceramic oxides, silicon carbide, rare earth oxides, and ceramic fibers. High temperature resistance, impact resistance, aging resistance, high coefficient of linear expansion, high adhesion, and easy construction. The high-temperature kiln refractory material is coated with a strong protective layer, which effectively protects the kiln lining refractory material and forms a dense integrated coating that is resistant to high temperature and fire. This greatly extends the service life of the kiln lining material and reduces the damage rate of the kiln lining material. Maintenance and repair time is greatly shortened, and the normal use time of the kiln is extended by more than three times, which can bring considerable economic benefits to the enterprise.

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2023-07-10

Warm congratulations on the successful construction of the website!

Congratulations on the successful website construction of Junwei Refractory Materials Co., Ltd. in Yichuan County, Luoyang City!

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2015-08-06

$Luoyang Junwei Refractory Materials Co., LTD$

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Scientists Challenging Fire

Research on the Application of Vacuum Insulation Board Insulation Materials

Building insulation board system

High temperature resistant coatings, heat-resistant and energy-saving, achieving a double harvest during the National Day holiday

New refractory material protective coating increases kiln life by three times

Warm congratulations on the successful construction of the website!

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