Development of Pyrolytic Gasifier

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  • MURAKAMI Takahiro
    Ishikawajima-Harima Heavy Industries Co.,Ltd., Research Laboratory
  • XU Guangwen
    Ishikawajima-Harima Heavy Industries Co.,Ltd., Research Laboratory
  • SUDA Toshiyuki
    Ishikawajima-Harima Heavy Industries Co.,Ltd., Research Laboratory
  • MATSUZAWA Yoshiaki
    Ishikawajima-Harima Heavy Industries Co.,Ltd., Research Laboratory
  • TANI Hidehisa
    Ishikawajima-Harima Heavy Industries Co., Ltd., Power Plant Division

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Other Title
  • パイロリティックガス化炉の開発
  • パイロリティックガスカロ ノ カイハツ

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Abstract

The purpose of this study is to investigate experimentally the characteristics of a pyrolytic gasifier. Two facilities were used. One is a 1⁄5 scale plastic model of the 6t⁄d pilot plant. With this model the relative solid circulation rate was measured. The second facility was used the lab-scale bubbling fluidized bed gasifier coupled with a pneumatically transported char bed combustor. Here, the gasification characteristics were investigated for a two-stage bubbling fluidized bed gasifier.The results revealed that a relative solid circulation rate above 20 could be achieved by control of fluidized bed height and pressure in the gasifier, therefore allowing self-sustaining operation. The combustor inlet showed severe wear; hence, for this part abrasion-resistant material must be used. Concerning gasification characteristics, the two-stage bubbling fluidized bed gasifier showed a remarkable increase in gasification efficiency and tar suppression. When gasifying Ca-impregnated fuel, however, no remarkable change in tar contents was observed. This result is interpreted such that tar can easily be reformed/destructed by a Ca-catalyst. A cold gas efficiency about 83.5 %, which is feasible for self-sustained operation, was still achieved at somewhat lower temperatures in the gasifier for Ca-impregnated fuel. Consequently, the operation of the pyrolytic gasifier is easy. However, for the lower temperature tar increased. Therefore, gas reforming at a subsequent stage of the gasifier is important.

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