蓄热球的特点和应用 Features and applications of thermal storage balls

耐火蓄热球作用于热风炉蓄热室,该产品是一种含铝高而特制成的耐高温材料,起到保护炉壁的作用。 产品根据材质分为高铝质， 莫来石质， 以及铬刚玉莫来石质。

Refractory regenerator balls are used in the regenerator chamber of hot blast stoves. This product is a specially made high-temperature resistant material with a high aluminum content, serving to protect the furnace walls. The product is available in three types based on its material composition: high-alumina, mullite, and chrome corundum mullite.

在余热回收利用技术上 , 蓄热体的吸热与放热特性决定其节能效果及能源利用效率。目前常用的蓄热球直径一般在 Φ11～22之间 , 有高铝、刚玉莫来石、铬刚玉莫来石、锆刚玉莫来石等多种材质 , 特别是铬刚玉莫来石蓄热球 , 以其优良的抗渣性、热传导快、容重大、蓄热量大等优点 , 克服了普通蓄热球易结渣、粉化等缺陷 , 节能效果和使用寿命大大提高 , 所以优质陶瓷蓄热体的制备成为蓄热技术的关键。通过实验证明以红柱石、矽线石为骨料 , 配加 α -A l2O3、镁砂 , 经过合适的成型和烧结工艺 , 制成的蓄热陶瓷球抗渣性能较好。

In waste heat recovery technology, the heat absorption and release characteristics of the heat storage body determine its energy-saving effect and energy utilization efficiency. Currently, commonly used heat storage balls generally have diameters between Φ11 and 22 mm and are made of various materials such as high-alumina, corundum mullite, chromium corundum mullite, and zirconium corundum mullite. In particular, chromium corundum mullite heat storage balls, with their excellent slag resistance, fast thermal conductivity, high density, and large heat storage capacity, overcome the defects of ordinary heat storage balls such as easy slag formation and pulverization, greatly improving energy-saving effect and service life. Therefore, the preparation of high-quality ceramic heat storage bodies has become the key to heat storage technology. Experiments have shown that using andalusite and sillimanite as aggregates, combined with α-Al₂O₃ and magnesia, and through appropriate molding and sintering processes, produces heat storage ceramic balls with good slag resistance.

本公司生产的蓄热小球，比表面积可达到240m2/m3。具有以下特点
 众多小球将气流分割成很小流股，气流在蓄热体中流过时，形成强烈的紊流，有效的冲破了蓄热体表面的附面层，又由于球径很小，传导半径小、热阻小、密度高、导热性好，故可实现蓄热式烧嘴频繁且快速换向的要求。
 蓄热球可利用20~30次/h的换向，高温烟气流经蓄热体床层后内便可将烟气降至130℃左右排放。
 高温煤气和空气流经蓄热体在相同路径内即可分别预热到仅比烟气温度低100℃左右，温度效率高达90%以上。
 因蓄热球体积十分小巧，加之小球床的流通能力强，即使积灰后阻力增加也不影响热换指标。
 蓄热小球具有抗氧化、抗渣性强的特点。
 陶瓷小球的更换、清洗非常方便，并可重复使用。

Our company produces heat storage spheres with a specific surface area of ​​up to 240 m²/m³. They possess the following characteristics:

Numerous spheres divide the airflow into very small streams. As the airflow passes through the heat storage body, it creates strong turbulence, effectively breaking through the boundary layer on the surface of the heat storage body. Furthermore, due to the small sphere diameter, small conduction radius, low thermal resistance, high density, and good thermal conductivity, it can meet the requirements of frequent and rapid reversing in regenerative burners.

The heat storage spheres can achieve reversing 20-30 times/hour. High-temperature flue gas can be cooled to approximately 130°C before being discharged after passing through the heat storage bed.

High-temperature coal gas and air flowing through the heat storage body can be preheated to only about 100°C lower than the flue gas temperature within the same path, achieving a temperature efficiency of over 90%.

Because of the extremely small size of the heat storage spheres and the strong flow capacity of the sphere bed, even increased resistance due to ash accumulation does not affect the heat exchange performance.

The heat storage spheres are characterized by strong oxidation resistance and slag resistance.

The ceramic balls are very easy to replace and clean, and can be reused.

蓄热球的应用
 氧化铝蓄热球主要用于冶金行业热风炉蓄能蓄热用的耐火球。氧化铝蓄热球具有纯度、高强度大、热震稳定性好,使用寿命长等优点，蓄热球是一种以AL2O3、高岭土、合成骨料，莫来石晶体等材质制成。按照滚制和机压成型法两种。该产品具有强度高、抗热震性优良、更换清洗方便、使用寿命长等优点。蓄热瓷球主要有陶瓷小球、多孔圆柱瓷球、多孔圆瓷球三种，该产品具有耐高温、抗腐蚀、热震稳定性好、密度高、热阻小、强度高、蓄放热量大、导热性能好等显著优点，特别适应于空气分离设备蓄热器和钢铁厂高炉煤气加热炉作蓄热填料，该技术是通过对煤气和空气进行双预热，即使低热值的劣质燃料也能实现稳定着火，使燃烧温度快速达到轧钢对钢坯加热的要求。
 蓄热球特性：
 蓄热瓷球具有强度高、耐磨损；导热率和热容量大、蓄热效率高；热稳定性好、温度剧变时不易破裂等优点。
 蓄热球应用领域：
 蓄热球特别适用与空气分离设备蓄热器和钢铁厂高炉煤气加热炉作蓄热填料，通过对煤气和空气进行双预热，使燃烧温度快速达到轧钢对钢坯加热的要求。
 球状蓄热体主要规格： Φ16mm  Φ18mm  Φ20mm  Φ25mm产品材质分为：氧化铝、高铝质、铬刚玉莫来石质。

Applications of Thermal Storage Balls

Alumina thermal storage balls are mainly used as refractory balls for energy storage and heat storage in hot blast stoves in the metallurgical industry. Alumina thermal storage balls have advantages such as high purity, high strength, good thermal shock resistance, and long service life. They are made from materials such as Al2O3, kaolin, synthetic aggregates, and mullite crystals. They are produced using two methods: rolling and machine pressing. This product has advantages such as high strength, excellent thermal shock resistance, convenient replacement and cleaning, and long service life. Thermal storage ceramic balls mainly come in three types: small ceramic balls, porous cylindrical ceramic balls, and porous round ceramic balls. This product has significant advantages such as high temperature resistance, corrosion resistance, good thermal shock resistance, high density, low thermal resistance, high strength, large heat storage and release capacity, and good thermal conductivity. It is particularly suitable for use as thermal storage packing in air separation equipment accumulators and blast furnace gas heating furnaces in steel plants. This technology achieves stable ignition even with low-calorific-value, inferior fuels through double preheating of the gas and air, allowing the combustion temperature to quickly reach the requirements for heating steel billets during steel rolling.

Characteristics of Thermal Storage Balls:

Thermal storage ceramic balls possess advantages such as high strength and wear resistance; high thermal conductivity and heat capacity, resulting in high thermal storage efficiency; good thermal stability, and resistance to breakage under drastic temperature changes.

Applications of Thermal Storage Balls:

Thermal storage balls are particularly suitable for use as heat storage fillers in air separation equipment accumulators and blast furnace gas heaters in steel plants. By preheating both gas and air, the combustion temperature can be rapidly reached to meet the requirements for heating steel billets during rolling.

Main Specifications of Spherical Thermal Storage Bodies: Φ16mm, Φ18mm, Φ20mm, Φ25mm. Product materials include: alumina, high-alumina, and chromium corundum mullite.