一、Company Profile
Sichuan Shichuang Weina Technology Co., Ltd. is located in Mianyang, Sichuan, China's Science and Technology City. After years of continuous research, innovation, and technological breakthroughs, it has become a professional company leading in technology and equipped with sophisticated equipment for the development of ultrafine and super-micron grinding technology for materials, the research and manufacture of classification/collection equipment, and the supply of complete sets of equipment. The company advocates independent innovation and pursues excellence, boasting a team of master's and doctoral researchers specializing in fluid dynamics, mechanics, materials, and structural research. Since its establishment, the company has obtained 18 national patents and provided dozens of production lines and hundreds of supporting equipment to Shandong Zaozhuang Mining Group, Guangdong Penghu Industrial Co., Ltd., and other enterprises.
The company can design and manufacture the most suitable and economical high-quality ultrafine and super-micron grinding, classification, and collection equipment for materials based on user needs. The company's high-level R&D team, industrial on-site experimental base, dedicated design software for numerical simulation, advanced testing instruments, and methods have created conditions for achieving this goal.
二、Application Background and Significance
Traditional comprehensive utilization of fly ash mainly involves its use in backfill, brickmaking, soil modification, etc., with issues such as low effective utilization rate and insignificant economic benefits. With the development of fly ash deep processing technology, especially the breakthrough in super-micron grinding technology, ultrafine fly ash can be used in multiple high value-added industries such as cement (e.g., additives, admixtures), rubber (e.g., additives), plastics (e.g., additives), and composite materials (e.g., as a substitute for silica fume, coatings). It is estimated that the annual usage of ultrafine fly ash in cement exceeds 25 million tons, while plastic and rubber usage are approximately 3 million tons and 1.5 million tons, respectively (replacing carbon black, with a particle size reaching D97-2 microns). Clearly, the market and economic benefits of comprehensive utilization of fly ash based on ultrafine grinding are significant. Fly ash, a fine ash captured from the flue gas after coal combustion, is the main solid waste discharged from coal-fired power plants. With the development of the power industry, the emission of fly ash from coal-fired power plants has increased year by year, becoming one of the largest industrial wastes in China. Currently, the annual production of fly ash is about 500 million tons, with a comprehensive utilization rate of only 30-40%, resulting in a massive accumulation of approximately 2.5-2.8 billion tons. Without proper treatment, a large amount of fly ash can generate dust, polluting the atmosphere; if discharged into water systems, it can cause river siltation, and the toxic chemicals in it can harm humans and organisms. As the country places increasing emphasis on environmental protection, the effective treatment and resource utilization of fly ash has become an industry challenge.
The Steam Kinetic Mill is a tailored material superfine grinding system for thermal power plants, utilizing low-grade superheated steam from thermal power plants as the power source and fly ash residue as the raw material.
三、Principle and Advantages of Steam Kinetic Mill
3.1 System Principle and Composition
Tailored to the operating characteristics of thermal power plants, the Steam Kinetic Mill uses low-grade steam as the power source, leveraging unique supersonic airflow collision technology to accelerate fly ash residue, causing mutual collisions and shearing, thereby achieving superfine grinding. The ground material undergoes turbine airflow classification, with qualified fine powder entering the dust removal system for collection, while coarse powder returns to the grinding chamber for further grinding. The entire superfine grinding process is conducted in a completely dry environment, and the purified air is exhausted through an induced draft fan. The Steam Mill system typically comprises four parts: the feeding system, the main system, the classification system, and the collection system.
3.2 Advantages
(1) Low cost/energy consumption, low risk, and low noise. Mechanical grinding generally struggles to grind particles to below 10um, and is plagued by issues such as high energy consumption and severe noise pollution. While air jet milling can meet the requirements, its energy utilization rate is only about 2%, limiting its application due to high energy consumption and low productivity (energy transfer process: fuel's thermal energy → potential and thermal energy of superheated steam → electrical energy → air potential energy → kinetic energy of jet airflow → kinetic energy of material particles). Conventional air jet milling also has specific requirements for medium storage, posing a higher safety risk. In contrast, the production cost of steam mills is only 1/5 to 1/8 of that of air jet mills.
(2) The grading particle size is finer, enabling nanoscale grading with superior spherical particle shape and even particle size distribution. The high-temperature steam mill boasts over twice the grinding intensity of traditional jet mills, with an impact force more than four times that of conventional jet mills, achieving 30% energy savings. For instance, it can process ultrafine powders of 10um and even ultra-micro powders of 1-2um as required.
(3) It makes full use of unused superheated steam, aligning with the nation's policy of promoting energy conservation and emission reduction. It is easily eligible for government technological funding support and national scientific awards. The steam mill utilizes the superheated steam (approximately 250°C, 0.25MPa) from power plants, which is a less efficiently utilized heat source, thereby enhancing waste heat utilization in power plants. This has significant economic and social impacts.
(4) It is easy to maintain with low maintenance costs. The steam-driven mill utilizes material-on-material collisions for grinding, resulting in minimal equipment wear. Large foreign objects (bolts, iron pieces, etc.) in the raw materials will not damage the equipment upon entry, leading to low maintenance rates, few vulnerable parts, and low equipment maintenance costs.
(5) It has a wide range of technical applications. Typical materials include fly ash, desulfurization waste residue, titanium dioxide, coal powder, petroleum coke, carbon black, carbon, blast furnace slag, steel slag, graphite, mica, talc, quartz, calcite, barite, diatomite, aluminum/magnesium hydroxide, metal oxides, and all other temperature-resistant materials.
IV. Company's Steam Mill Technology Research and Development Advantages
4.1 Relevant Technical Research Conducted by the Company
After years of technological research and development, our company has made breakthroughs in the following related technologies:
(1) Theoretical methodology for efficient shredding with superheated steam. This includes key structural design and multiphase flow simulation methods. The structural design involves Laval nozzle design, nozzle angles, spacing, and nozzle quantities. Multiphase flow encompasses fluid-solid interactions, raw material acceleration, collisions, ruptures, and transportation.
(2) High-efficiency separation and grading technology for ultrafine and ultra-micro materials. This encompasses predicting the centrifugal force generated by rotating blades to screen particles that meet particle size requirements. It involves Classifier Wheel design, including rotational speed, blade design (blade shape, number, length, etc.), and noise reduction.
(3) Collection technology for ultrafine and ultra-micro materials. This includes selecting suitable materials for collection bags, ensuring efficient capture of the ultrafine particles while minimizing dust leakage and maintaining the integrity of the collected material.
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