COMPRESSION DEVICE

• Main Authors: SEYAMA KATSUHIRO, TEZUKA SATOSHI
• Format: Patent
• Language: English; Korean
• Published: 11.05.2020
• Subjects: BLASTING; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED,LIQUEFIED, OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; HEATING; LIGHTING; MECHANICAL ENGINEERING; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; STORING OF DISTRIBUTING GASES OR LIQUIDS; VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED ORSOLIDIFIED GASES; WEAPONS

An objective of the present invention is to prevent oil from sticking to a reliquefaction line while ensuring the sealing property of a compression device. To this end, a compression device (10) comprises: a reciprocating and non-lubricating front compression unit (21) for suctioning and compressing boil-off gas; a rear compression unit (23) for compressing the boil-off gas compressed by the front compression unit (21); and a reliquefaction line (29) for re-liquefying at least a portion of the boil-off gas compressed by the rear compression unit (23). The rear compression unit (23) has reciprocating multi-stage compression mechanisms (23a to 23d). The multi-stage compression mechanisms (23a to 23d) include a rod lubricating compression mechanism (31) which has a piston, a piston rod provided with the piston at the leading end, and a rod packing adjacent to the piston rod which is lubricated between the piston rod and the rod packing. 압축 장치(10)는, 보일 오프 가스를 흡인하여 압축하는 왕복동식이며 또한 무급유식의 전단 압축부(21)와, 전단 압축부(21)로 압축된 보일 오프 가스를 압축하는 후단 압축부(23)와, 후단 압축부(23)로 압축된 보일 오프 가스의 적어도 일부를 재액화하는 재액화 라인(29)을 구비한다. 후단 압축부(23)는, 왕복동식 복수단 압축 기구(23a 내지 23d)를 갖는다. 복수단 압축 기구(23a 내지 23d)에는, 피스톤과 선단에 피스톤이 마련된 피스톤 로드와 피스톤 로드에 인접하는 로드 패킹을 갖고, 피스톤 로드와 로드 패킹 사이에 급유되는 로드 윤활 압축 기구(31)가 포함되어 있다.