HEAT STORAGE DEVICE, POWER GENERATION PLANT, AND OPERATION CONTROL METHOD DURING FAST CUT BACK

To provide a technique for efficiently storing and using surplus energy generated in a power generation plant, in a plurality of different temperature ranges.SOLUTION: A heat storage device 140 comprises a plurality of heat storage parts for collecting heat from fluid passing through a flow passage provided in an interior and accumulating it, and also comprises a first heat storage part having a temperature property in a first temperature range, a second heat storage part having a temperature property in a second temperature range that is a lower temperature range than the first temperature range, a first flow passage 241 for passing the inflow fluid through the first heat storage part and a second heat storage part in this order, a second flow passage 242 for bypassing the first heat storage part and passing the inflow fluid through the second heat storage part, a first opening/closing valve 251 provided on the first flow passage 241, and a second opening/closing valve 252 provided on the second flow passage 242. The first opening/closing valve 251 is opened when the temperature of the fluid is equal to or higher than a first temperature threshold value. The second opening/closing valve 252 is opened when the temperature of the fluid is less than the first temperature threshold value.SELECTED DRAWING: Figure 3 【課題】発電プラントで発生する余剰エネルギを複数の異なる温度域で効率よく貯蔵、利用する技術を提供する。【解決手段】内部に設けられた流路を通過する流体から熱を回収して蓄積する複数の蓄熱部を有する蓄熱装置１４０であって、第一温度域に温度特性を持つ第一蓄熱部と、第一温度域より低い温度域である第二温度域に温度特性を持つ第二蓄熱部と、流入する流体を、第一蓄熱部、第二蓄熱部の順に通過させる第一流路２４１と、流入する流体を、第一蓄熱部をバイパスして第二蓄熱部を通過させる第二流路２４２と、第一流路２４１上に設けられる第一開閉弁２５１と、第二流路２４２上に設けられる第二開閉弁２５２と、を備え、第一開閉弁２５１は、流体の温度が第一温度閾値以上である場合、開状態となり、第二開閉弁２５２は、流体の温度が第一温度閾値未満である場合開状態となることを特徴する。【選択図】図３