Other

Osaka Gas Company Limited

Kaoru Kawamoto

Toshihiro Nitta

Nobuaki Hashimoto

Atsushi Nitanda

Tsutomu Marubashi

Kouhei Harada

Tomokazu Ueda

Kaoru Watanabe

Tomohito Okamura

Keisuke Kawata

Kenji Tsuzaki

Hiromasa Tani

Takahito Tanabe

To derive a feasible solution for an operation plan problem for storage tanks for storing liquefied natural gas, which is a complicated mixed-integer non-linear problem, given tank initial state information, reception plan information, and feed plan information, two solving processes are executed alternately two or more times, respectively: a first solving process that replaces a mixed-integer non-linear programming problem with a mixed-integer linear programming problem by linear approximation of a non-linear expression in non-linear constraints containing the non-linear expression, and solves the problem to derive provisional solutions or final solutions for a reception pattern that prescribes a storage tank that is to receive liquefied natural gas, and a discharge pattern that prescribes a storage tank that is to discharge liquefied natural gas, and a second solving process that replaces a mixed-integer non-linear programming problem with a continuous non-linear programming problem by provisionally fixing a discrete variable in discrete form constraints containing the discrete variable, and solves the problem to derive provisional solutions or final solutions for transitions of storage quantity and storage heat quantity of liquefied natural gas in each storage tank.

System and method for deriving storage tank operation plan

A liquid outlet pipe extended from a lower end of a liquid storage reservoir,is communicated with a section in the proximity of a lower portion of a refrigerant liquid dispersing pipe,. A plurality of liquid outlet holes,are provided on an upper surface of the refrigerant liquid dispersing pipe,. Diameters of the liquid outlet holes,are differently determined depending on a distance between a communicated section of the liquid dispersing pipe,and the liquid storage reservoir,, in order to equalize an amount of refrigerant liquid flowing from the outlet holes,. When the liquid storage reservoir,is filled with the refrigerant liquid, the refrigerant liquid flows upward within the liquid dispersing pipe,so as to inject the refrigerant liquid in accordance with a liquid head pressure. This equalizes the amount of the refrigerant liquid injecting from each of the liquid outlet holes,, and flowing along an entire area of an evaporation coil,evenly so as to significantly ameliorate an evaporation capability.

Dripping device for an absorption type refrigerator

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Osaka, Japan

Kaoru Kawamoto