| 摘要 |
The invention concerns a heat exchanger designed to heat a fluid and foamy cold substance, containing solid particles and gases, such as liquid manure, from a hot liquid. The invention is characterised in that it comprises a plurality of elementary exchangers (1a, 1b) mounted in series, consisting of a horizontal tube (2) with a heat-conductive wall, wherein the substance is circulated, from one end to the other, and of a concentric tubular casing (3), enclosing said tube (2), wherein the hot liquid is circulated from one end to the other, and in a direction opposite to that of said substance, and inside the tube (2) is mounted coaxial a rotary shaft (4) bearing a helical brush (40) forming an Archimedean screw thread, rubbing against the tube inner wall (2) for transporting the substance therein. Said exchanger is particularly useful for preheating liquid manure in a dehydrating plant.
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