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首页> 外文会议>32nd Annual Hydrometallurgy Meeting and International Conference on the Practice and Theory of Chloride/Metal Interaction, Vol.2, Oct 19-23, 2002, Montreal, Quebec, Canada >Energy Recovery in the Metal Chloride Pyrohydrolysers
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Energy Recovery in the Metal Chloride Pyrohydrolysers

机译：金属氯化物热解器中的能量回收

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摘要

Large amounts of energy leave the pyrohydrolysis reactor with the off-gas and the solids. Considering the rising cost of fuel, energy recovery is increasingly important for an economical operation. Due to process constraints, the potential sources of energy recovery in pyrohydrolysis are limited to the following: 1. Sensible heat of the roaster off-gas, which is partially recovered in existing plants 2. Latent heat of the final off-gas, which is not recovered in any known plant 3. Sensible heat of the hot oxides, which can be recovered by existing technologies. In modern installations, the sensible heat content of the reactor off-gas is partially recovered by pre-evaporation of the metal chloride solution. However, it is shown that the solubility limit of the metal chloride curtails a complete sensible heat recovery. Process modelling shows that increasing the pyrohydrolysis efficiency and reducing the roaster off-gas rate can increase the sensible heat recovery. Options for latent heat recovery from the scrubbed off-gas (～65% steam) are evaluated. The use of a heat pump to lift the off-gas temperature and generate steam is possible, as is recovery in the form of hot water to provide a low-grade space heating source. Implementation of these options has high capital costs that must be justifiable by the potential energy savings. Energy recovery from hot roaster oxides (in form of process steam) is defined. The existing fluidised bed waste heat boiler technology can be used for this purpose, except for the spray roasters that produce a very fine product.
机译：大量能量与废气和固体一起离开热解反应器。考虑到燃料成本的上升，能量回收对于经济运行越来越重要。由于工艺上的限制，热水解中能量回收的潜在来源仅限于以下几种：1.焙烧炉废气的显热，在现有工厂中部分回收。2.最终废气的潜热，即在任何已知的工厂中均未回收。3.可以通过现有技术回收的热氧化物的显热。在现代设备中，反应器废气的显热含量通过金属氯化物溶液的预蒸发而部分回收。然而，已表明，金属氯化物的溶解度极限限制了完全的显热回收。过程建模表明，提高热解效率和降低焙烧炉废气率可以提高显热回收率。评估了从洗涤后的废气（约65％的蒸汽）中回收潜热的选项。使用热泵来提高废气温度并产生蒸汽是可能的，以热水的形式回收以提供低等级的空间加热源也是可能的。这些选择的实施具有很高的资本成本，必须通过潜在的能源节约来证明其合理性。定义了从热焙烧氧化物（以工艺蒸汽的形式）中回收能量的方法。现有的流化床废热锅炉技术可以用于此目的，但喷淋式焙烧炉可产生非常精细的产品。

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