The present invention relates to a reliquefaction system of boil-off gas and a ship having the same. According to the present invention, the reliquefaction system of boil-off gas comprises: a liquefied gas storage tank; and a reliquefaction apparatus which liquefies boil-off gas generated in the liquefaction gas storage tank into a refrigerant whose phase is changed. The reliquefaction apparatus includes: a refrigerant compressor which is able to mix the lubricant with the refrigerant when compressing the refrigerant; a refrigerant cooler which cools down the compressed refrigerant; a liquefier which allows the refrigerant to exchange heat with the boil-off gas; a refrigerant separator which allows the refrigerant introduced into the liquefier to be divided into gas and liquid, and allows the liquid and the gas of the refrigerant to join different flows from that of each other in the liquefier; and a pressure-reducing valve which reduces the pressure of the refrigerant which has exchanged heat with the boil-off gas in the liquefier, and returns the refrigerant to the liquefier. In addition, the reliquefaction system of the boil-off gas further includes a lubricant processing unit which processes the lubricant mixed with the refrigerant in the reliquefaction apparatus. The lubricant processing unit includes: a lubricant circulation unit which divides the refrigerant into gas and liquid between the refrigerant compressor and the refrigerant cooler, and circulates the divided lubricant to the refrigerant compressor; and filter units which are placed in at least two positions on the refrigerant flows and which have different data from each other in accordance with the phase of the lubricant. The present invention aims to provide the reliquefaction system of boil-off gas and the ship having the same, which are able to effectively remove the lubricant remaining inside.

본 발명은 증발가스 재액화 시스템 및 이를 포함하는 선박에 관한 것으로서, 액화가스 저장탱크; 및 액화가스 저장탱크에서 발생한 증발가스를 상변화하는 냉매로 액화하는 재액화장치를 포함하며, 상기 재액화장치는, 압축 시 냉매에 윤활유가 혼입될 수 있는 냉매 압축기; 압축된 냉매를 냉각하는 냉매 쿨러; 냉매와 증발가스를 열교환하는 액화기; 상기 액화기에 유입된 냉매를 기액분리해 액상과 기상의 냉매가 상기 액화기에서 서로 다른 흐름에 합류되도록 하는 냉매 분리기; 및 상기 액화기에서 증발가스와 열교환한 냉매를 감압 후 상기 액화기로 리턴하는 감압밸브를 포함하며, 상기 재액화장치에서 냉매에 혼입되는 윤활유를 처리하는 윤활유 처리부를 더 포함하고, 상기 윤활유 처리부는, 상기 냉매 압축기와 상기 냉매 쿨러 사이에서 냉매를 기액분리해 윤활유를 분리하여 상기 냉매 압축기로 순환하는 윤활유 순환부; 및 상기 냉매 흐름 상에서 적어도 두 위치에 마련되며 상기 윤활유의 상에 따라 서로 다른 제원을 갖는 필터부를 포함하는 것을 특징으로 한다.