Kabushiki Kaisha Kobe Seiko Sho

Koichi Ueno

Kenichiro Mitsuhashi

Ken-ichiro Mitsuhashi

Shin-ichiro Kashihara

Kazuhiko Asada

Katsuo Kurose

Shigemi Okamoto

Keizo Konishi

Hiroo Nishimura

Akio Tsukamoto

Tamotsu Tori

Kazuhiko Kuwahara

Fukuzo Harada

A heat exchanging device of a gas liquefying plant including a precooling section with a single component refrigerant system, a liquefying section with a multi-component refrigerant system where the liquefying section has an array of plate-fin type heat exchangers installed in a vertical orientation with their hot end being set at an upper part of a refrigerating container and its cold end being set at a lower part of the refrigerating container. The plate-fin type heat exchangers are divided into predetermined temperature cooling ranges arranged in a vertical orientation with the hottest end being placed at the upper part and the coldest end being placed at the lower part of the refrigerating container.

Gas liquefying method and heat exchanger used in gas liquefying method

This invention relates to a gas liquefying method in which a power saving of a compressor for refrigerant can be attained. The pre-cooled gas flow, the high pressure vapor flow and the high pressure condenced liquid flow obtained by gas-liquid separation of partial condensed high pressure multi-component refrigerant are fed from the upper part of the high temperature region of the upright plate-fin type heat exchanger having its upper side applied as the high temperature region and its lower side applied as the low temperature region so as to be cooled, the cooled gas flow and the high pressure vapor flow are fed from the upper part of the low temperature region into the different flow passages so as to be cooled there, the liquefied gas is recovered from the lower part of the low temperature region, the vapor part and the liquid part obtained by expanding the liquefied high pressure vapor flow extracted from the lower part of the low temperature region are separated into gas and liquid, thereafter they are mixed to each other, fed from the lower part of the different flow passage in the low temperature region, used as the source of cold heat, then the mixture is extracted from the upper part of the low temperature region, mixed with a flow obtained by expanding the high pressure condensed liquid flow of the multi-component refrigerant passed through the high temperature region and further the mixture is divided into gas and liquid, the vapor part and the liquid part are mixed to each other, fed from the lower part of the different flow passage in the high temperature region and used as a source of cold heat, and extracted from the upper part of the high temperature region, compressed and cooled and further it is circulated as the partial condensed high pressure multi-component refrigerant.

Heat exchanging apparatus

According to the present invention there is provided a small-sized thermosiphon free from deterioration in its cooling efficiency caused by pressure loss of a refrigerant and in which a two-phase flow of a fluid to be cooled is sure to be distributed uniformly. The thermosiphon includes a cooling cylinder 1 having a plurality of independent refrigerant tanks 2 formed by partition walls 1c which are disposed between fluid inlet port 1a and outlet port 1b inside the cylinder, and a plate fin type heat exchanger 50 extending inside the cylinder through the partition walls 1c hermetically sealably. Under this construction, it is not necessary to use pipes for the circulation of refrigerant C between the refrigerant tanks 2 and refrigerant circulation paths 54 in the heat exchanger 50, thus preventing the deterioration of the cooling efficiency caused by pressure loss of the refrigerant. Besides, it also becomes unnecessary to use a to-be-cooled fluid pipe for the connection between plural refrigerant tanks, whereby a two-phase flow of the fluid to be cooled is sure to be distributed uniformly and the deterioration of the cooling efficiency is prevented, thus permitting reduction in the size of the thermosiphon.

Plate fin heat exchanger built-in type multi-stage thermosiphon

A vaporizer for liquefied natural gas which prevents the heat exchanger tubes from being extremely cooled, without reducing the vaporizing efficiency. The vaporizer is characterized in that each of the heat exchanger tubes connecting the lower header and upper header contains a pipe for liquefied natural gas in a certain region from its end near the inlet, said pipe having on its outer surface fins which are in pressure contact with the inner surface of the heat exchanger tube, and the heat exchanger tube is in direct contact with the natural gas in its region near the outlet and beyond the region in which the pipe for liquefied natural gas lies.

Vaporizer for liquefied natural gas

Growing community of inventors

Takasago, Japan

Koichi Ueno