| 摘要 |
This invention relates to apparatus for carrying out physical and/or chemical processes, more specifically a heat exchanger (10) of the continuous type, comprising a large number of vertical heat exchanger tubes (18) mounted between a lower chamber (17) and an upper chamber (16) within a jacket (15). Within the tubes (18) small solid particles are kept in a fluidised condition by the fluid medium passing up from the lower chamber (17) through the tubes (18), so as to achieve a good heat transfer, whereas also any deposit will be removed from the inner tube (18) walls. For the downward flow of the granular mass at least one return tube (21) is provided. Downward circulation of the fluid medium through the return tube (21) should be minimal, however, which can be achieved by controlling of the pressure difference between the upper and lower chamber (16; 17), which increase of the pressure difference can be achieved by fitting a distribution plate (24) at a level above the return tube (21) outlet into the lower chamber (17), and further by means of a by-pass (61) and a throttle device (71). |
