Abstract: A depolymerization system with a tube-wound heat exchanger (4) comprises a heat exchange device for heating a material, having a material output; a gas-liquid separation device (1) having an inlet and a gas output, connected to the material output of the heat exchange device; and a depolymerization device (2) connected to the gas output of the gas-liquid separation device (1); the heat exchange device comprises at least one tube-wound heat exchanger (4). The depolymerization rate is greatly improved and the service period of the whole depolymerization system can be greatly improved.

Abstract: An atmospheric-vacuum heat exchange system with a winding-tube heat exchanger, has a first and second heat exchanging group; a primary distillation tower (4) or flash tower; an atmospheric furnace (5); an atmospheric tower (6); a vacuum furnace (7) and a vacuum tower (8); each winding-tube heat exchanger has a shell-pass cylinder (370), a first and second shell-pass connecting tube (371,372), a first and second tube plate (330,340), a plurality of first and second tube box (310,320), a plurality of heat exchange tubes (360) spirally wounded with multiple spiral tube layers; the number of the first and second tube box (310, 320) are respectively N, and each spiral tube layer has N group(s) of the wounded heat exchange tubes (360), N is a natural number greater than or equal to 1. The loss of heat exchanger is reduced.

Abstract: A heat exchange, which includes a casing having a cylinder; two connectors respectively attached to one end of the cylinder through the small opening; two convex heads respectively connected through the opening end to the large opening of a connector; a core disposed inside the casing; and two heat transfer medium passages. In this way, the space at the ends of the casing of the heat exchanger may be enlarged, thereby providing a space large enough to accommodate the construction personal and better working environment for two-side welding and future maintenance and wider selection range of material of the casing of the heat exchanger; a buffer area is provided for the flow of the heat transfer medium, and the auxiliary like baffles may be mounted inside the convex heads as required to further improve the heat exchange efficiency and reduce the cost.

Abstract: The invention relates to a cooler for low-temperature methanol washing gas, which comprises a first heat exchanger and a second heat exchanger. The first heat exchanger includes a first housing, a first board, and a first heat exchange tube. The first housing is provided with a first feed gas inlet, a first feed gas outlet, a first heat transfer medium inlet, and a first heat transfer medium outlet. The second heat exchanger includes a second housing, a second board, and a second heat exchange tube. The second housing is provided with a second feed gas inlet, a second feed gas, a second heat transfer medium inlet, and a second heat transfer medium outlet. The second housing and the second board of the second heat exchanger may be made with a relatively thin plate, thereby enormously reducing the material and manufacturing cost for the invention with meeting the requirements of the production.