報告書番号

W91016

タイトル（和文）

溶融炭酸塩型燃料電池用石炭ガス精製システムの最適構成

タイトル（英文）

OPTIMUM CONSTITUTION OF COAL-GAS CLEANUP SYSTEM FOR MOLTEN CARBONATE FUEL CELL POWER PLANTS

概要 （図表や脚注は「報告書全文」に掲載しております）

現状の除去技術からなるガス精製システムを，石炭ガス化／ＭＣＦＣ複合発電プラントに適用した場合の熱効率，システム構成の複雑さ，およびその他の特徴の面から評価し，最適な構成を摘出した。既存あるいは開発中の除去技術を組み合わせると，以下の特徴を持つ３方式ガス精製システムが考えられる。（１）湿式法中心のシステムＡは，排水処理への負担が大きく，また複数の大容量熱交換器を必要とする。脱硫を完全に行うため湿式脱硫装置とは別に乾式の精密脱硫剤が必要となる。（２）乾式法中心のシステムＢは，構成機器数が最も多い上に，簡素化は困難である。また窒素化合物やハロゲン化物の除去法などの末開発の技術も多い（３）乾式法と湿式法を組み合わせたシステムＣは，大容量の熱交換器が必要となるが，排水処理の負担は軽い。また，脱硫装置を一体化する新技術の開発等により，簡素化および運転費の低減を図ったシステムＤに発展できる可能性

概要 （英文）

PRESENT AND FUTURE GAS-PURIFICATION PROCESSES CAN CONSTITUTE POTENTIAL COAL-GAS CLEANUP SYSTEMS FOR MCFC APPLICATIONS. WE EVALUATED THREE COAL-GAS CLEANUP SYSTEMS BY THEIR FEATURES INCLUDING THERMAL EFFICIENCY,SIMPLICITY OF PROCESS FLOW,AND EASE OF DEVELOPING CONSTITUENTS. WE AIMED TO OBTAIN THE MOST SUITABLE SYSTEM CONFIGURATION FROM THE EVALUATION. THE SYSTEMS ARE CHARACTERIZED AS FOLLOWS: (1)SYSTEM A MAINLY CONSISTING OF WET PROCESSES HAS DISADVANTAGES OF LARGE HEAT EXCHANGERS AND LARGE AMOUNTS OF WASTE WATER TO DEAL WITH. AN ADDITIONAL HOT-GAS DESULFURIZATION UNIT IS NECESSARY TO REACH THE SULFUR TOLERANCE LIMIT. THIS SYSTEM HAS LEAST POTENTIAL FOR NEW DEVELOPMENT. (2)SYSTEM B COMPOSED OF HOT-GAS PURIFICATION PROCESSES HAS THE MAXIMUM NUMBER OF PROCESSING UNITS. IT IS NOT POSSIBLE TO SIMPLIFY THE SYSTEM FLOW BECAUSE THE HALIDE ABSORBER IS BETWEEN THE SULFUR-REMOVAL UNITS. FINALLY,IT NEEDS TECHNOLOGIES THAT ARE DIFFICULT TO DEVELOP. (3)SYSTEM C COMBINING BOTH WET AND HOT-GAS CLEANUP PROCESSES HAS THE ADVANTAGE OF LIGHT LOADS FOR WASTE-WATER TREATMENT,AND EASINESS OF DEVELOPMENT OF EACH PROCESS,ALTHOUGH THE SYSTEM REQUIRES A LARGE HEAT EXCHANGER. IT IS POSSIBLE TO SIMPLIFY THIS SYSTEM AND CUT OPERATION COSTS BY INTRODUCING NEW TECHNOLOGY FOR COMBINING THE DESULFURIZATION UNITS.THESE SYSTEMS WERE EVALUATED AS HAVING COMPARABLE THERMAL EFFICIENCY WHEN APPLIED TO INTEGRATED GASIFICATION/MCFC POWER GENERATION PLANTS. CONSEQUENTLY,SYSTEM C IS MOST SUITABLE FOR DEVELOPMENT. IT IS IMPORTANT TO DEVELOP NEW PROCESSESTO SIMPLIFIY THE SYSTEM AND OPERATION.

報告者

キーワード