我国地方钢铁工业的小高炉,正以精料及高风温为中心进行技术改造。为使用各种形式的蓄热式热风炉,必须供给经济、高质量而稳定的净煤气。目前普遍使用的湿式洗涤塔文氏管净化系统能量损耗和用水量大,煤气质量受高炉冶炼条件(如冶炼强度等)及风机能力的影响,排出的大量废水易污染环境,无法在缺水地区应用。根据地方小高炉建设条件及生产特点,1974年以来,配合球式热风炉,采用滤袋除尘器进行了煤气干式除尘的工业性试验。两年多的生产实践表明,这种净化系统的生产效果显著,具有以下特点: 1.除尘效率高,净煤气含尘量低于10毫克/标准米~3(表1),最低者仅0.68毫克/标准米~3。热风炉生产八个月后,球床几乎无煤气灰造成的渣化现象。 2.煤气质量稳定,不受煤气量及煤气压力等条件变化的影响,使热风炉工作稳 China’s local small and medium steel industry blast furnace, concentrates and high wind temperature as the center for technological transformation. To use various types of regenerative stoves, an economical, high quality and stable net gas must be supplied. Currently widely used wet scrubber Venturi purification system energy loss and water consumption, gas quality by the blast furnace smelting conditions (such as smelting strength, etc.) and the ability of fans, the discharge of a large number of waste water easily pollute the environment, not in water-scarce areas application. According to the local small blast furnace construction conditions and production characteristics, since 1974, with the ball-type stove, the use of filter bag filter gas dry dust industrial test. More than two years of production practice show that the purification system has remarkable production effect and has the following characteristics: 1. High dust removal efficiency, net dust content less than 10 mg / standard m3 (Table 1), the lowest is only 0.68 Mg / standard meter ~ 3. After eight months of hot stove production, the bed has almost no slag gasification caused by gas ash. 2. Gas quality is stable, not affected by changes in the gas volume and gas pressure conditions, so hot stove stable