報告書番号

W89037

タイトル（和文）

石炭ガス化用乾式脱硫剤の長期信頼性－残留硫黄による影響評価（その３）－

タイトル（英文）

LONG TERM RELIABILITY OF DESULFURIZATION SORBENT FOR HOT COAL GAS -INFLUENCE OF RESIDUAL SULFUR(PART 3)-

概要 （図表や脚注は「報告書全文」に掲載しております）

固定床方式脱硫システムに適用する酸化鉄系ハニカム脱硫剤について，還元・脱硫・再生の各工程における硫黄分の挙動を検討した。その結果以下の各項目が明らかになった。（１）再生時には圧力の上昇とともに残留硫黄量が増大し，１０ａｔｍでは再生開始時に脱硫剤に吸収されていた硫黄分の３０～４０％が残留する。（２）４００℃以上で還元を行えば，圧力によらず再生時の残留硫黄の４０％程度を放出させることができる。（３）還元工程に引き続いて再生を行えば，還元後に残留した硫黄分をさらに低減させることができる。以上の結果から，本脱硫システムにおいては，脱硫終了時に吸収されていた硫黄分の２０～３０％残留硫黄を見込んだ設計・運用を行う必要があることがわかった。

概要 （英文）

THIS REPORT IS PART OF A SERIES ON EVALUATION OF THE DURABILITY OF AN IRON-OXIDE SORBENT DEVELOPED FOR INTEGRATED COAL-GASIFICATION COMBINED-CYCLE POWER GENERATION. THE PREVIOUS REPORTS SHOWED THAT THE INFLUANCE OF RESIDUAL SULFUR ON SORBENT PERFORMANCE IS SUFFICIENTLY LOW OVER 30 DESULFURIZATION/REGENERATION CYCLE UNDER ATMOSPHERIC PRESSURE. IN THIS STUDY,WE EVALUATED THE EFFECTS OF PRESSURE ANDTEMPREATURE ON THE BEHAVIOR OF THE SULFUR TO DETERMINE THE EXPECTED DECREASE IN THE CAPACITY OF THE SORBENT. A SERIES OF TESTS WERE PERFORMEDON DESULFURIZATION,REGENERATION AND REDUCTION UNDER PRESSURIZED CONDITIONS. THE FOLLOWING RESULTS WERE OBTAINED. (1)THE RESIDUAL SULFUR AFTERREGENERATION AT 400 DEGREE INCREASED BY UP TO 40% AFTER DESULFURIZATION WITH INCREASED PRESSURE TO 10 ATM. (2)THE REMAINING SULFUR DECOMPOSEDTO SULFUR DIOXIDE AND RESIDUAL IRON SULFIED DURING REDUCTION IN A COAL-GAS ATMOSPHERE AT 400 DEGREE OR ABOVE. THE MOLAR RATIO OF THE DESORBEDSO2 TO THE RESIDUAL SULFUR AT REGENERATION WAS MORE THAN 0.4. (3)THE REMAINING IRON SULFIDE WAS GENERALLY REDUCED WHEN THE SORBENT WAS REGENERATED IMMEDIATELY AFTER THE REDUCTION STEP. THESE RESULTS LEAD US TO CONCLUDE THAT THE AMOUNT OF RESIDUAL SULFUR IS EXPECTED TO BE ONLY 20% TO30% OF ALL THE SULFUR EXISTING BEFORE REGENERATION. THIS VALUE SHOULD BE CONSIDERED IN DESIGN AND OPERATION OF FIXED-BED DESULFURIZATION REACTORS USING THIS SORBENT.

報告者

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