Abstract
A novel method that a heat recovery system from blast furnace slag integrated with coal gasification reaction to generate syngas was proposed. The motion characteristic and critical velocity of the coal particles in the molten slag were estimated. Meanwhile, the effects of temperature and steam to coal ratio on coal gasification product distribution and gas characterization were discussed. The results showed that the coal particles (~75 μm) would break through the bondage of bubbles and transport into molten slag when the velocity of coal particles were above 4.20 m·s-1 and the diameter of bubbles were less 6 mm. There had higher gasification efficiency, gas yield production and H2 production by this method. The results suggested that the optimal conditions for slag waste heat recovery were achieved at 1623 K and steam to coal ratio of 2.0. Under these conditions, the gas yield and carbon conversion reached 133.48 mol·kg-1 and 97.81%, respectively. The proposed method enhanced the coal gasification efficiency and recovered the high quality of molten blast furnace slag waste heat effectively, and had important guidance for industrial manufacture.
Highlights
Nowadays, with the continuous development in China, there was an increasing consideration of energy saving and emission reduction in the traditional industry, especially in the iron and steel industry, as an energy and carbon intensive industry [1,2,3]
The coal particles were transported into the molten Blast furnace slag (BFS) by N2 and gasification agent stream
The residual coal particles were captured by slag when these were gradually rising to the surface of molten slag (State D)
Summary
With the continuous development in China, there was an increasing consideration of energy saving and emission reduction in the traditional industry, especially in the iron and steel industry, as an energy and carbon intensive industry [1,2,3]. Blast furnace slag (BFS) was one of the main by-products of iron and steel industry. 0.3 tons of BFS were produced for each ton of steel manufactured. The BFS came out at above 1773 K and each ton carried about 1.77 GJ of energy [4]. About 235 million tons of BFS were produced with energy content of 4.16×108 GJ, which was converted into 14.20 million tons standard coal. It was of great significance to recover and utilize the high quality waste heat of molten BFS for iron and steel industry
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