The Study on Soot-Blowing Optimization Based on Theory of Specific Entropy Generation

Abstract

The intention of this paper is to survey a bran-new soot-blowing optimization method based on the second law of thermodynamics. From the entropy theory of the second law of thermodynamics, irreversible energy loss of convective heating surfaces was analyzed. The calculation model of heat transfer entropy generation, flow resistance entropy generation, mass transfer entropy generation, soot-blowing media entropy generation, soot-blower motor entropy generation were established. However, it was analyzed that soot-blowing optimization system applying heat transfer entropy generation had existed vice, so specific entropy generation calculation model was established. Taking the convective heating surfaces of a certain 600 MW power unit's boiler as the object of consideration, based on the collection of on-line DCS data, specific heat transfer entropy generation and soot-blowing net income for single unit capacity of heat transmission were calculated. The result figure showed that specific heat transfer entropy generation was the largest of each term specific entropy generation. The result figure also showed that each heating surface's soot-blowing net income was great different. And it is come up with some strategy for soot-blowing optimization system adopting specific entropy generation. The strategy has got reference value toward engineering practice.