| 摘要 |
<p>Sludge is subjected to a fermentation process in which the gas generated is used as fuel for raising the temp. of the sludge, and for external heating purposes, so that the efficiency of the exploitation of the heat energy of a sewage treatment plant is raised to the max. The gas generated is used for driving the combustion motor of a heat pump. The vaporising side of this is in heat exchanging relationship with the sewage, to recover heat energy from it. The condensation side of the pump gives heat to the sludge for maintaining it at an optimal temp. and also to a first heat-consuming arrangement. Moreover, the heat in the cooling water and in the exhaust gases of the engine are used in a second heat consuming arrangement, whilst the remainder of the sludge fermentation gas is used in a third head consuming arangement. The consumption of methane by the sewage plant itself which produces it is reduced. The unused gas can then be applied elsewhere, where a higher temp. level is required. The gas produced is used in the best and most efficient manner, so that the necessary heat is transmitted to the purifying plant without a wasteful secondary circuit, and at the same time, the excess is used elsewhere as heat energy.</p> |
