Solid Products Found in 150t/d Pilot Plant of Coal Liquefaction (II):Massive Coking Matter Appeared inside the Heating Coil of Vacuum Tower Heating Furnace
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The development of coal liquefaction technology using a 150t/d pilot plant of NEDOL process has been carried out in Kashima city, Japan. Since December 1996 to September 1998, the pilot plant has been successfully operated without any seri-ous trouble throughout the operations. However a variety of massive solid matters appeared inside the heating coil of vacuum tower heating furnace, especially upper side of the inner wall of the coil.<BR>In this paper, these solid matters were analyzed chemically and morphologically to investigate their formation mechanism.<BR>The solid products were found to consist of coal minerals and catalyst which were dispersed in the semi-coke block on the upper side of the coil showing zigzagging bound-ary.<BR>Coke forming mechanism speculated from our study was as follows.<BR>(1) Vaporization of light fraction in coal liquid forms slug flow pattern of coal liquid inside the heating coil.<BR>(2) Upper side of the heating coil is heated up above 450°C with high heat flux.<BR>(3) Splashes of coal liquid containing coal minerals and catalyst were trapped first on the upper surface of the heating coil.<BR>(4) The coal liquid trapped on the upper surface is carbonized quickly, to form semi-coke of high densities.<BR>(5) In the next stage, light fraction in the liquid is vaporized to be further trapped among the semi-coke grains produced first on the wall, giving semi-coke of well-developed anisotropy and low mineral content.<BR>Steam injection was useful to inhibit development of the coke. Elimination of light fraction in the coal liquid before vacuum distillation and reduction of heat flux of the fur-nace are effective to inhibit development of the coke.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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