中国電力(株)三隅１号1000MW超臨界圧変圧運転石炭だきボイラは，600/600℃の最高レベルの蒸気条件に対応することはもちろん，燃焼面においても，新型A-PMバーナ，新型MRSⅡミル等の先進技術を結集して，今まで以上に高効率・低NO_Xを実現した最新鋭ボイラである．本報では，計画概要と，良好な試運転結果について以下の項目等に関し報告する．(1)垂直管火炉方式の高い信頼性，(2)A-PMバーナ，MRSⅡミルによる低NO_X・低未燃分の実現，(3)燃焼性の向上による高いボイラ効率と計画値の30％より低い石炭専焼最低負荷の達成（15％負荷まで試運転にて確認済み)．

Steam temperature has been raised to 600/600℃ at the Chugoku Electric Power Co.. Inc.. Misumi Thermal Power Station No.1 coal-fired, supercritical sliding pressure operation boiler supplied by MHI with a vertical furnace water wall. The boiler achieved high efficiency and low NO_X emission with A-PM burner and MRSⅡ pulverizer. This paper reports the boiler's design features and operation results, e, g.. (1)the highly reliable vertical furnace waterwall. which uses rifled tubing. (2)low NO_X and low unburned Carbon in fly ash owing to the A-PM burner and MRSⅡ pulverizer, and (3)the higher boiler efficiency of 91.8% and flexible boiler operation in coal exclusive firing at enough lower load than guaranteed minimum load of 30% (15% load was confirmed in trial operation).