Abstract
Low rank coals are cheaper than high rank coals but are seldom used as fuel for coal fired power plants directly because they have several adverse effects including a lower plant efficiency due to the large energy loss by the latent heat of water content. In this study, the combination of the coal drying technology with the coal power plant was analyzed as a way to enhance the usefulness of the low rank coal. In the combined system, some of the extracted steam for feed water heating was used for coal drying. The influences of steam extraction location and amount of drying coal on the power plant performance were investigated. It was found that the system power was nearly insensitive to the mass flow rate of the drying coal until a certain point but then it began to decrease over the critical mass flow rate. The thermal efficiency decreased with increasing mass flow rate but the rate of decrease slightly is reduced over the critical value. In addition, we researched the influence of coal drying strategy on the power plant performance.
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