| 摘要 |
A heat exchanger for using a hot liquid to warm a cold substance that is fluid and foamy, containing solid particles and gas, such as liquid manure. The invention is characterized in that it comprises a plurality of unit heat exchangers (1) connected in series, each constituted by a horizontal tube (2) having a heat conducting wall, in which the substance is caused to circulate from one end to the other, and a concentric tubular case (3) surrounding said tube (2) in which the hot liquid is caused to circulate from one end to the other in the opposite direction to the circulation of said substance, and that inside said tube (2) there is coaxially mounted a rotary shaft (4) carrying a helical brush (40) forming an Archimedes' screw thread that rubs against the inside wall of the tube (2) to ensure that the substance is transported therealong. Said heat exchanger is particularly useful for preheating liquid manure in a dehydration installation.
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