Treatment device for non-condensable gas of liquefied gas carrier and control method

According to the treatment device and the control method for the non-condensable gas of the liquefied gas carrier, the treatment device is provided with the high-pressure liquid storage heat exchange tank, liquid cargo components and the non-condensable gas can be separated in the high-pressure liquid storage heat exchange tank, the temperature of a mixture of the non-condensable gas and liquid cargo steam is further reduced, and therefore the non-condensable gas can be effectively treated. Therefore, the concentration of the liquid cargo boil-off gas contained in the top non-condensable gas mixture is greatly reduced when the top non-condensable gas mixture is discharged, so that more liquid cargo boil-off gas in the top mixed gas is cooled and converted into a liquid state to fall into the bottom, and the waste of the liquid cargo is effectively reduced. Meanwhile, due to the fact that the non-condensable gas is gathered at the top of the high-pressure liquid storage heat exchange tank, the partial pressure