Also known as an intermediate gas cooler, the components are the front and rear ends of the body, the fins are mounted in the front end and cut with a number of uniform fin holes, the fin holes are connected to the fins by a heat exchanger tube to, the front end has a front end tube plate and the rear end has a rear end tube plate, the strainer is above the tube bundle body in the body and the vapour separator is above the strainer; the vapour separator is fixed at both ends by bolts on the left and right side plates respectively.