報告書番号

283076

タイトル（和文）

乾式熱交換器の湿式運転による伝熱促進－火力プラントの性能向上予測－

タイトル（英文）

HEAT TRANSFER ENHANCEMENT BY WET OPERATION OF A DRY COOLING ASSEMBLY-HEAT REJECTION PERFORMANCE OF A MODEL PLANT-

概要 （図表や脚注は「報告書全文」に掲載しております）

乾式熱交換器は補給水が不要，白煙発生がないなどの利点をもち，温暖期における排熱性能を改善することができれば電力施設へ適用できよう。そこで乾式熱交換器の伝熱面を濡らして伝熱促進を行う湿式運転に着目し，前々報では実験検討を行った。本報では伝熱管への新しい散水方式についての実験検討を行い，さらに想定モデルプラントについて温暖期に湿式運転を行う場合の発電効率，白煙問題，所要補給水量について検討，評価した。

概要 （英文）

DRY COOLING SYSTEM HAS SOME MERITS FROM THE STANDPOINT OF MAKE-UP WATER AND/OR VISIBLE PLUME, BUT IT HAS A PROBLEM OF LOSING HEAT REJECTION PERFORMANCE AT HIGH AMBIENT TEMPERATURE. THUS,ITS COOLING PERFORMANCE MUST BE IMPROVED IN SUMMER FOR THE APPLICATIONTO THE POWER PLANT OF JAPAN. IN THE FIRST REPORT, WE PROPOSED AN ADVANCED DRY COOLING SYSTEM BASED ON HELLER SYSTEM. THIS SYSTEM OPERATES IN DRY MODE AT LOW AIR TEMPERATURE SEASON AND IN WET MODE (DELUGING THE OUTSIDE SURFACE OF HEAT TRANSFER SECTION BY INDUSTRIAL FRESH WATER) AT HIGH AIR TEMPERATURE SEASON. THE SECOND REPORT SUMMARIZED THE INTERIM EXPERIMENTAL RESULT OF HEAT TRANSFER ENHANCEMENT BY WET OPERATION. IN THISREPORT, WE DESIGN THE ADVANCED DRY COOLING SYSTEM FOR A 165MW COMBINEDSTEAM AND GAS TURBINE POWER PLANT IN BROAD OUTLINE, AND CALCULATE RELATIONSHIP BETWEEN OPERATION MODE AND THERMAL EFFICIENCY. THE RESULT SHOWS: (1) AS A TECHNIQUE OF WETTING HEAT TRANSFER SECTION, THE METHOD OF DRIPPING WATER FROM THE TOP IS SUPERIOR TO THE METHOD OF SPRAYING FROM THE FRONT. (2) THIS SYSTEM NEEDS TWO COOLING TOWERS WHICH IS 18HY 65METERS IN SIZE TO GET SUFFICIENT EFFICIENCY IN DRY MODE AT SEASON WHEN AIR TEMPERATURE IS BELOW 20DEGREE C. (3) THE THERMAL EFFICIENCY OF THIS PLANT CAN BE IMPROVED CONSIDERABLY, FOR EXAMPLE 1.2% (ABSOLUTE VALUE) UP IN AUGUST OF JAPAN,BY WET OPERATION OF THIS SYSTEM WITHOUT A PROBLEM OF VISIBLE PLUME.

報告者

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