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首页> 外文会议>Asia's Largest Power Generation Conference and Exhibition Vol.2, Sep 22-24, 1999, Singapore >DEVELOPMENT OF A FLY ASH RECIRCULATION SYSTEM IN PFBC
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DEVELOPMENT OF A FLY ASH RECIRCULATION SYSTEM IN PFBC

机译：PFBC中粉煤灰循环系统的开发

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摘要

A simple and effective fly ash recirculation system has been developed for PFBC and proven in a commercial-scale 71 MWe unit. Significant reductions in sorbent requirements have been proven, which result in lower O&M costs for sorbent and ash treatment. Further, the system allows low SOx emissions even with very high sulphur fuels and thus opens the possibility to burn cheap high sulphur fuels like petroleum coke in an environmentally friendly manner and make even further reductions in cost of electricity. Improvements in combustion efficiency can be achieved with this system, which is particularly important for low reactive fuels (low volatile bituminous coals, anthracite and petroleum coke), and this results in higher plant efficiencies and thus lower cost of electricity. The recirculation of fly ash results in increased in-bed heat transfer, thus, the heat transfer surface can be reduced, resulting in cheaper boiler designs. Also, the system gives excellent gas clean-up performance in combination with a Ceramic Tube Filter which allows removal of all gas clean-up cyclones and hence reduces costs.
机译：已为PFBC开发了一种简单有效的粉煤灰再循环系统，并已在商业规模的71 MWe机组中得到验证。已经证明，吸附剂需求量的显着降低，从而降低了吸附剂和灰分处理的运维成本。此外，该系统即使使用非常高的硫燃料也允许低的SOx排放，因此开辟了以环保的方式燃烧廉价的高硫燃料（如石油焦）的可能性，并进一步降低了电力成本。使用该系统可以提高燃烧效率，这对于低反应性燃料（低挥发性烟煤，无烟煤和石油焦）尤为重要，这可以提高电厂效率，从而降低电力成本。飞灰的再循环导致床内传热增加，因此，传热表面可以减少，从而使锅炉设计更便宜。此外，该系统与陶瓷管式过滤器相结合，可提供出色的气体净化性能，从而可去除所有气体净化旋风分离器，从而降低成本。

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