Abstract
This paper presents an in-depth study on the indirect drying characteristics and interface renewal. By comparing the drying rate curve, it is found that shortening the surface drying stage, which contains a repeated evaporation-diffusion-condensation process of moisture, is the key to improve the total drying efficiency. By stirring the coal and realizing the interface renewal between the bottom layer and the surface layer, the drying efficiency reached seven times than that of static indirect drying. Based on indirect heat transfer with high heat and mass transfer rate, a new type of indirect heat transfer moving bed coal moisture control device is designed. At the same time, Fluent fluid mechanics software is used for mathematical modeling and simulation experiments. It is proved that the designed moving bed coal moisture control device has a good application prospect in coal pre-drying technology.
Highlights
Research data from 2017 “BP World Energy Outlook” showed that coal still accounted for a massive30% of the world’s primary energy structure, second only to oil which accounted for about 32%
A new indirect heat transfer technology for coal moisture control is proposed in this paper, in order to improve drying efficiency and reduce energy consumption of indirect heating
It was proved that the interface renewal was an effective way to enhance the indirect heat and mass transfer rate
Summary
Research data from 2017 “BP World Energy Outlook” showed that coal still accounted for a massive30% of the world’s primary energy structure, second only to oil which accounted for about 32%. The iron and steel industry is a pillar in the Chinese economy. It provides basic raw materials for national economic and industrial construction, but it consumes a large amount of coal [2]. In 2016, the Chinese iron and steel industry consumed 618 million tons of coal, accounting for 16% of the total coal consumption. Setting a pre-drying process before coking could efficiently lower the energy consumption, improve the quality of the coke, increase the blending ratio of non- or weak-caking coal, reduce the production of greenhouse gases and harmful gases, as well as reduce the impact on the water environment [4,5,6,7]
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