Coal gasification characteristics in a downer reactor

✍ Scribed by Y.J Kim; S.H Lee; S.D Kim

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 797 KB
• Volume: 80
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/s0016-2361(01)00052-7

✦ Synopsis

Subbituminous coal (Shenwha) was gasi®ed at atmospheric pressure in a downer reactor (0.1 m I.D. £ 5.0 m high). The effects of reaction temperature (750±8508C), steam/coal mass ratio (0.23±0.86), O 2 /H 2 O mole ratio (0±1.81) and coal feeding rate (5.3±9.0 kg h 21 ) on the composition of product gas, carbon conversion, cold gas ef®ciency, gas yield and calori®c value have been determined. In the case of steam injection into the loop-seal, compositions of the product gas (vol. %; N 2 free basis) in the gasi®cation region are H 2 (35.8±39.4%), CH 4 (6.8± 15.5%), CO (14.9±15.9%), CO 2 (20.7±29.5%), C 2 H 4 (2.8±4.9%), C 2 H 6 (2.5±3.5%), C 3 H 6 (1.6±3.3%) and C 3 H 8 (1.7±2.5%) with a calori®c value of 13.0±15.2 MJ/m 3 . By changing the reactant gas supplied into the loop-seal for solid circulation from steam to air, product gas yield and carbon conversion increase, whereas calori®c value of the product gas decreases from 13.0±15.2 to 6.3±10.6 with reaction temperature.