| 摘要 |
<p>A rotary rehydration cooler (100) is described which stabilizes coal against spontaneous combustion by concurrently rehydrating and cooling coal char (126) as it is transported through the cooler (100). The rotary cooler (100) comprises a generally cylindrical vessel having a plurality of heat exchangers (102) affixed thereto, the heat exchangers (102) containing a cooling fluid capable of precisely controlling the internal temperature of the vessel. In one preferred embodiment, the rotary cooler (100) has a plurality of coal char lifters (122) which are spaced apart and affixed to the walls (104) of the vessel in a position proximate a plurality of water sprays (112). Pyrolyzed coal char enters the cooler at an inlet end (106) and is transported through the cooler (100) at a controlled rate. As the cooler (100) rotates, the heat exchangers (102) contact the coal char (126) and thereby gently mix and cool the char (126). When the coal char (126) reaches the coal char lifters (122), it is raised by the lifters (122) into a position proximate the water sprays (112) and is rehydrated by the water sprays (112) at a controlled rate. The heat produced by the rehydration process is concurrently removed by contact of the wetted coal char (126) with the heat exchangers (102). The rotary cooler (100) preferably has a control system (200) which monitors the coal char (126) temperature and moisture content to optimize rehydration by adaptively controlling the coal transport rate, the water spray rate, and the cooling fluid flow rate. One preferred embodiment of the present rotary cooler (100) uses an improved water spray device (113) which eliminates clogging problems associated with prior art water sprays.</p> |
