Dry distillation circulating fluidized bed boiler with transfer valve

The invention provides a dry distillation circulating fluidized bed boiler. The boiler comprises a hearth, a boiler and a separator, wherein a dry distillation cylinder is arranged between the separator and the hearth, recycling ash of the separator enters the dry distillation cylinder and is mixed with lignite so as to be dry distilled, and then the lignite undergone dry distillation enters the hearth to be burned. Lignite dry distillation and the circulating fluidized bed boiler are combined, so that the lignite dry distillation cost is lowered, the lignite is burned on the spot so as to beused efficiently; the thin high-temperature recycling ash can be better mixed and dry distilled with lignite, thereby greatly lowering lignite dry distillation cost and improving the comprehensive profits. 本发明提供种干馏循环流化床锅炉。包括炉膛、锅和分离器，在分离器和炉膛之间设干馏筒，分离器的返料灰进入干馏炉内与褐煤混合并进行干馏，干馏后的褐煤至炉膛燃烧。褐煤干馏与循环流化床锅炉结合，降低了褐煤干馏的成本，又使褐煤就地燃烧，实现褐煤的高效利用；高温返料灰粒度细，有利于与褐煤的混合干馏，可以大大降低褐煤干馏成本，综合效益高。