STEAM GENERATOR

PROBLEM TO BE SOLVED: To provide a steam generator which inhibits increase of manufacturing costs and is excellent in durability.SOLUTION: A steam generator 1 includes: a tank part 2 having an evaporation tank 21 and a water header 22; a tube 25 disposed in the evaporation tank; a spray nozzle 23 disposed in the evaporation tank 21; a spray water line L4 which supplies the water stored in the water header 22 to the spray nozzle 23 as spray water; a heat source fluid supply line L1 which supplies a heat source fluid to the tube 25; a heat source fluid discharge line L2 which discharges the heat source fluid; a bypass line L8 which connects the heat source fluid supply line L1 with the heat source fluid discharge line L2; a flow regulating valve 15 which regulates an amount of the heat source fluid circulating from the heat source fluid supply line L1 to the tube 25 side; and a starting time valve control part 82 which controls an opening of the fluid regulating valve 15 so that a difference between a temperature of the heat source fluid and a temperature of the spray water at the downstream side of the tube 25 becomes a first setting value.SELECTED DRAWING: Figure 1 【課題】製造コストの増加を抑制でき、かつ、耐久性に優れた蒸気発生装置を提供すること。【解決手段】蒸気発生装置１は、蒸発タンク２１及び水ヘッダ２２を有するタンク部２と、蒸発タンクの内部に配置されるチューブ２５と、蒸発タンク２１の内部に配置される噴霧ノズル２３と、水ヘッダ２２に貯留された水を噴霧水として噴霧ノズル２３に供給する噴霧水ラインＬ４と、チューブ２５に熱源流体を供給する熱源流体供給ラインＬ１と、熱源流体を排出する熱源流体排出ラインＬ２と、熱源流体供給ラインＬ１と熱源流体排出ラインＬ２とを接続するバイパスラインＬ８と、熱源流体供給ラインＬ１からチューブ２５側に流通する熱源流体の流量を調整する流量調整弁１５と、チューブ２５の下流側における熱源流体の温度と噴霧水の温度との差が第１設定値となるように流量調整弁１５の開度を制御する起動時弁制御部８２と、を備える。【選択図】図１