关键词: 移动床, 捕集颗粒, 喷动再生, 粉尘-捕集颗粒比, 提升气速, 循环量, 磨损

Abstract: The combustion of fossil fuel inevitably results in serious environmental pollutions such as discharging flue gas containing SO2, NO2 and CO2. Thus, efficient flue gas purification techniques, especially for the high-temperature gas purification process, are required to protect the environment as well as the downstream units. The moving bed filter is undoubtedly one of the most effective ways to high-temperature dedust. The collecting particles in moving bed filter are usually anticipated to be used recycling, thereby an effective regenerating method for the collecting particles is particularly needed. In this work, the spouting regenerating for the collecting particles of the moving bed filter was investigated. Therefore, it was necessary to determine the main operating parameters of the spouting regenerator for the collecting particles of the moving bed filter. The experimental research on the regenerating efficiency of the regenerator with the collecting particles containing dust was carried in a large plexiglass cold model experimental setup. The dust-collecting particles mixture was sampled both in the spent collector inclining tube and regenerating inclining tube under different operating conditions. These effects of the operating parameters including the dust/collecting particle ratio, the gas velocity and the circulating particle flux on the regenerating efficiency were investigated, respectively. Besides, the abrasion of collecting particles in the spouting bed was measured. On the other hand, the particle size variation during the regenerating process was also analyzed. By measuring the particle size distribution and the mass frequency of the sampled mixture, the corresponding regenerating efficiency under different operating conditions was obtained. It was found that, the dust/collecting particle ratio, the gas velocity and the circulation flux were all the key operating parameters for regenerating. Increasing the dust/collecting particle ratio and the gas velocity were beneficial to the regenerating efficiency, while increasing the circulating particles flux resulted in an opposite effect. Moreover, the spouting regenerator can achieve the high separation efficiency under the condition of high lifting gas flow velocity. If the gas velocity was too high, the collecting particles would also be brought away with the dust and sequentially, the magnitude of the collecting particles decreased. The spouting regenerating process inevitably led to the collecting particles abrasion and thus a suitable gas velocity was quite vital for the whole regenerating system. Based on the experimental results, the recommended gas velocity was generally 1.1?1.3 times that of the collecting particles.

Key words: moving bed, collecting particle, spouting regenerating, dust-collecting particle ratio, gas velocity, circulating particle flux, abrasion