THERMAL ENERGY RECOVERY DEVICE

• Main Authors: TSUBOI NOBORU, ADACHI SHIGETO
• Format: Patent
• Language: English; Japanese
• Published: 11.10.2018
• Subjects: BLASTING; COMBUSTION ENGINES; COOLING OF INTERNAL-COMBUSTION ENGINES; COOLING OF MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES; HEATING; HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINEPLANTS; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; NOT OTHERWISE PROVIDED FOR; ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES; STEAM ACCUMULATORS; STEAM ENGINE PLANTS; STEAM ENGINES; USE OF WASTE HEAT OF COMBUSTION ENGINES; WEAPONS

PROBLEM TO BE SOLVED: To make an oil easy to return to an expander even in a case where a thermal load in an evaporator is reduced.SOLUTION: A thermal energy recovery device 1 comprises: a circulation flow passage 4 in which an evaporator 10, an expander 14, a condenser 6 and a pump 8 are provided; and a controller 18 which controls a rotation speed of the pump 8. A mixed medium of a working medium that is evaporated by the evaporator 10 and an oil is led into the expander 14 and the expander 14 is driven. The controller 18 is capable of executing thermal load control for controlling the rotation speed of the pump 8 in accordance with a thermal load of the evaporator 10 and oil return control for driving the pump 8 at a rotation speed that is increased rather than the rotation speed of the pump 8 under the thermal load control. The oil return control is executed when a preset oil storage condition relating to a storage degree of the oil separated from the working medium that is evaporated by the evaporator 10 is established.SELECTED DRAWING: Figure 1 【課題】蒸発器での熱負荷が低下した場合であっても油が膨張機に戻りやすくするようにする。【解決手段】熱エネルギー回収装置１は、蒸発器１０と膨張機１４と凝縮器６とポンプ８とが設けられた循環流路４と、ポンプ８の回転数の制御を行う制御器１８と、を備え、蒸発器１０で蒸発した作動媒体と油との混合媒体が膨張機１４に導入されて、膨張機１４が駆動される。制御器１８は、蒸発器１０の熱負荷に応じてポンプ８の回転数を制御する熱負荷制御と、熱負荷制御によるポンプ８の回転数よりも高められた回転数でポンプ８を駆動する油戻し制御とを実行可能であり、油戻し制御は、蒸発器１０で蒸発した作動媒体から分離した油の溜まり具合に関する予め設定された油溜まり条件が成立したときに実行される。【選択図】図１