| 摘要 |
Power plant, particularly a the PFBC type, with combustion of a fuel in a fluidized bed containing a particulate sulphur-absorbing material. A discharge device for bed material and ashes comprises a quantity controlling crusher (56) which breaks down slag lumps so that the material can be transported away via a pneumatic pressure reducing transport device (64), or which grinds down slag lumps and other bed material so that unconsumed absorbent in the bed material is exposed, whereafter this material is returned to the bed (26). The plant includes a vertical crusher (56), to which an outlet (54) from the bed vessel (12) is eccentrically connected. The crusher (56) has a housing (110) with a stationary grinding portion (112) and a rotating grinding portion (116) with a plate (132) receiving bed material. Above the plate (132) there are a number of scrapers (184a-184g) each scraper forming a gap of different height with the plate 132. Thus each scraper scrapes off a layer of material during the rotation of the plate (132), resulting in an even distribution of the material along the periphery (182) of the plate (132). This ensures uniform wear around the stationary grinding portion (112). |
