百万塔式炉机组神华煤掺烧试验研究

为了研究塔式锅炉掺烧神华煤的适应性,采用预混和分磨2种掺烧方式,不断提高神华煤掺烧比例,评估锅炉运行的安全性、经济性和环保性。试验结果表明,随着神华煤掺烧比例的升高,灰渣含碳量降低,锅炉效率升高。神华煤预混掺烧比例低于75%时,锅炉汽水参数正常,锅炉没有出现结渣现象,锅炉对掺配煤种具有良好的适应性;神华煤掺烧比例高于75%时,锅炉局部出现结渣。分磨掺烧最高掺烧比例达到60%,锅炉局部出现结渣,并且在相同掺烧比例下,分磨掺烧的锅炉效率高于预混掺烧。长期高比例掺烧神华煤时,应注意加强燃烧器区域和一级过热器区域的监测,避免形成大渣块。

Experimental research on Shenhua coal blending combustion in a 1 000 MW tower type boiler unit

In order to study adaptability of Shenhua coal blending combustion in tower type boiler,the blending ratio of Shenhua coal was gradually raised by inner blended combustion and outer blended combustion.The security,economy and environmental protection of the tower type boiler were evaluated.The results showed that,with the increase of the blending ratio of Shenhua coal,the carbon content of ash decreased,the boiler efficiency increased.When the outer blending ratio of shenhua coal was less than 75％ and the inner blended ratio less than 60％,the water and steam parameters is normal,no boiler slagging phenomenon,the boiler had good adaptability to the coal.When the outer blending ratio was higher than 75％ and the inner blended ratio reached 60％,the local slagging appeared on the furnace waterwall,the boiler efficiency was higher than the outer blended combustion under the same coal proportion.Once the Shenhua coal was combusted for a long time,more attention should be payed to the primary superheater area and the burner area to prevent slagging.