Texaco气化炉上升管与下降管间环隙堵塞的探讨

Discussion on annulus slag blockage between riser and downcomer in Texaco gasifier

针对Texaco气化炉托砖板超温、上升管与下降管间环隙堵塞的实际问题,探讨了激冷水流量、激冷水含固量、水煤浆灰分、环隙宽度、激冷室液位、气化炉热负荷、烧嘴雾化效果对其造成的影响。结果显示,激冷室结垢是引起托砖板超温、环隙堵塞的主要原因,改善系统水质可缓解结垢现象;水煤浆灰分高、炉温高及烧嘴雾化效果降低使激冷室液池固含量升高,带水、带灰加剧,引起激冷水含固量升高,结垢现象加剧;控制激冷水流量在350~400m^3/h范围,对减少带水量、降低结垢速率有较好的效果;上升管与下降管间的环隙宽度、激冷室液位对环隙结垢、积渣堵塞起到重要作用。

Aiming at the practical problems of refractory brick over-temperature and annulus blockage between the riser and downcomer in Texaco gasifier, the effects of chilled water flow, solid content of chilled water, coal water slurry ash, annulus width, achilling chamber liquid level, gasifier heat load and burner atomization on them were discussed. The results showed that the fouling in the chilling chamber is the main reason for the refractory brick over-temperature and annulus blockage. The improvement of water quality in the system can relieve the fouling phenomenon. The high ash content of the coal water slurry, the high furnace temperature and the reduced atomization of the burners lead to the increase of the solid content of the chilled chamber liquid pool, which causes the water and ash of the process gas to increase and the fouling phenomenon intensifies. Controlling the chilled water flow rate in the range of 350-400m^3/h could effectively reduce process gas moisture content and fouling rate. The annulus width between the riser and downcomer and the liquid level in the quench chamber play an important role in fouling of the annulus and clogging of the accumulated slag.