Rotary kiln ring scraper (also known as ring scraper, ring beater, ring cleaner and ring shovel) is produced by Changsha Tianhe (English name: HITECOR) and is the only mechanical product in the world with independent intellectual property rights for cleaning rotary kiln rings. The invention patent number is 2004 10037079. 1, and the patent name is "cleaning method and device for rotary kiln ring". Rotary kiln scraper solved a worldwide problem! It has been widely concerned by the whole world and affirmed by the international industry. At present, it has been exported to developed countries and has become one of the core technical equipment in the rare earth project of Linus Australia. This intellectual property right is represented by Beijing Yingke Law Firm, the largest law firm in China.
1. Technical background: The intelligent quick scraper developed by He is a medium-sized machine with mechanical and electrical integration and intelligence, aiming at solving the common defects of rotary kiln, such as uneven kiln skin, thick kiln skin, long kiln skin, ring formation, nodulation and egg formation, which leads to uneven red kiln and material layer, increased resistance of rotary kiln system and reduced effective cross-sectional area in rotary kiln, seriously affecting the productivity and operation rate of rotary kiln. The machine consists of scraper, mechanical arm, walking system, cooling system and automatic control system. Generally, the length 10 to 25m, width 1.5 to 2.2m and height 1.8 to 3.5m.. The actual size should be designed and configured according to the user's site requirements.
Second, the use of quick scraper of rotary kiln: the intelligent quick scraper of rotary kiln is used to remove the ring formation at the kiln head and kiln tail, including front ring formation, rear ring formation and kiln mouth ring formation, which can level the kiln skin, expand the effective cross-sectional area of rotary kiln and improve the productivity and operation rate of rotary kiln. Can effectively prevent and prevent loop formation. The mechanical arm and scraper are used to cut the thick kiln skin and bottom layer of the rotary kiln under high-temperature gas, so that the thick kiln skin and ring formation in the rotary kiln can be quickly and thoroughly removed without stopping the kiln, so that the surface of the dynamically balanced rotary kiln skin is even, flat and rough, the material tumbling movement is smooth and smooth, and the material layer is even and stable. As we all know, the heating of rotary kiln bearings comes from the unevenness of rotary kiln skin and rotary kiln ring. When looping, a "threshold" is formed in the kiln, which hinders the advancement of materials and the circulation of gas, resulting in the overload of the system. Especially, the 180 radial inhomogeneity of the rotary kiln cylinder at the wheel belt is more harmful to the kiln ring; Uneven kiln skin is easy to cause red kiln and it is difficult to repair kiln skin.
The use of fast scraper in rotary kiln can effectively curb the red kiln, protect the bearing bush, motor and cylinder, reduce the wear of reducer, gear and gear ring, and greatly prolong the service life of rotary kiln lining. The process parameters of rotary kiln remain unchanged in use. With the scraper of rotary kiln, there is no need for cold burning and hot burning, kiln stopping or material reduction and punching after the rotary kiln rotates, which can effectively improve the operation rate of rotary kiln, improve the quality and output of material roasting, and reduce the idling rate of equipment and abnormal sewage discharge. There is no risk of burning or damaging kiln lining and kiln skin during use, and no material is consumed during use. The invention is suitable for all rotary kilns such as new dry cement rotary kilns, wet cement rotary kilns, alumina clinker rotary kilns, sodium vanadate rotary kilns, oxidized pellet rotary kilns, active lime rotary kiln rotary kilns, metal magnesium rotary kilns, kaolin rotary kilns, zinc oxide rotary kilns, bauxite rotary kilns and the like.
More importantly, the invention and application of quick scraper in rotary kiln is of decisive significance to the healthy development of direct reduced iron (sponge iron) and molten reduced iron (coke-free ironmaking) in coal-based rotary kiln. It can be said that there would be no healthy development of direct reduced iron (sponge iron) and molten reduced iron (non-coke ironmaking) in coal-based rotary kiln without scraper.
The inventors of the rotary kiln quick scraper are a group of intellectuals from Hunan University and Central South University. Relying on the strong scientific and technological strength and talent advantages in Hunan University and Yuelushan University Park, the research topic is forward-looking and predictable. As early as more than 20 years ago, this team began to tackle three major technical problems of direct reduced iron and molten reduced iron in coal-based rotary kiln, and one card was for decades. After more than ten years of painstaking research and experiments, we finally invented a series of technologies such as scraper and protected intellectual property rights. Its technical characteristics cover three major technical problems, and it has become the core part of direct iron reduction technology and molten iron reduction technology of coal-based rotary kiln.
The technology of smelting reduced iron in coal-based rotary kiln has opened up a broad prospect for comprehensively utilizing China's refractory minerals such as oolitic hematite, antelope stone and siderite and rich low-grade iron ore resources, comprehensively recovering various metal elements in vanadium-titanium ore, and recovering renewable resources such as copper slag, lead-zinc slag, sulfuric acid slag, iron oxide scale and metallurgical sludge. Under the current technical conditions, the technology of molten reduced iron in coal-based rotary kiln is the only technical route that can make use of China's abundant low-grade iron ore. In the next few years or decades, it may completely replace the current mainstream ironmaking technology-blast furnace ironmaking technology, and the import of iron ore will gradually decrease or stop completely. The equipment manufacturing market capacity of coal-based rotary kiln smelting reduced iron technology may reach trillions of yuan. At present, a commercial war storm for trillions of market share is quietly emerging. It should be highly concerned by venture capitalists.
3. Working principle of quick scraper in rotary kiln: The working principle of intelligent quick scraper in rotary kiln is similar to the working condition when the machine tool processes the inner wall of workpiece, that is, the mechanical arm and scraper extend into the kiln from the kiln head or kiln tail, and can reach the position where the kiln ring and thick kiln skin are formed. The axial trajectory of the scraper is roughly parallel to the axis of the rotary kiln cylinder, and the scraper is relatively static in the radial direction. The designer skillfully used the rotation of the rotary kiln cylinder, kiln skin and kiln ring and the relative displacement between the scrapers. Because the surface of kiln ring and thick kiln skin is soft and brittle at high temperature, the scraper cuts off the heat conduction between the bottom layer of kiln ring and thick kiln skin, which makes the kiln ring and thick kiln skin lose their foundation, causing some kiln rings and thick kiln skin to burst and soften and gradually collapse. The fallen kiln ring and thick kiln skin are mixed with the flowing materials in the kiln and continue to be calcined into clinker. When the kiln ring and thick kiln skin are removed, the scraper automatically and quickly retreats outside the kiln. Practice has proved that it is very easy, fast and effective to remove the thick kiln skin and the ring formation in the rotary kiln, expand the effective cross-sectional area of the rotary kiln, maintain the high ellipticity of the cross-section of the inner wall of the rotary kiln cylinder and effectively prevent the ring formation.
Fourth, the structural characteristics of the quick scraper of the rotary kiln: The quick scraper of the rotary kiln adopts artificial intelligence technology, which has the functions of automatic positioning, automatic walking and automatic exit to ensure the safety of the production line and the scraper of the rotary kiln itself. Scraper is generally equipped with automatic control system, which has the functions of anti-interference, dust prevention and high temperature prevention. The service life of the equipment is expected to be above 10 year, in which the scraper is a wearing part and can be replaced quickly, and the service life is above 1 year.
5. User feedback: Under normal circumstances, it is better to start the scraper when the ring formation in the rotary kiln is not too serious.
This article was published online in 2006 and reprinted by many websites. This publication has been revised. In recent years, this article has been plagiarized and tampered with to the point of contradiction and incoherence.