China Petroleum & Chemical Corporation

Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation

Beijing Research Institute of Chemical Industry Sinopec

Zhiguo Du

Guoqing Wang

Lijun Zhang

Cong Zhou

Zhaobin Zhang

Yonggang Zhang

Junjie Liu

Xianfeng Zhou

Ying Shi

Xiaofeng Li

Shifang Yang

Dongfa Shen

Shasha Yang

Jinghang Guo

Wei Li

Shuo Chen

The present invention relates to the field of fluid heat transfer, and discloses a heat transfer enhancement pipe as well as a cracking furnace and an atmospheric and vacuum heating furnace including the same. The heat transfer enhancement pipe () includes a pipe body () of tubular shape having an inlet () for entering of a fluid and an outlet () for said fluid to flow out; internal wall of the pipe body () is provided with a fin () protruding towards interior of the pipe body (), wherein the fin () has one or more fin sections extending spirally in the axial direction of the pipe body (), and each fin section has a first end surface facing the inlet () and a second end surface facing the outlet (), at least one of the first end surface and the second end surface of at least one of the rib sections is formed as a transition surface along spirally extending direction. The heat transfer enhancement pipe can reduce thermal stress of itself, thereby increasing service life of the heat transfer enhancement pipe.

Heat transfer enhancement pipe as well as cracking furnace and atmospheric and vacuum heating furnace including the same

The present invention relates to the field of fluid heat transfer, and discloses a heat transfer enhancement pipe as well as a cracking furnace and an atmospheric and vacuum heating furnace including the same. The heat transfer enhancement pipe () includes a pipe body () of tubular shape having an inlet () for entering of a fluid and an outlet () for said fluid to flow out; internal wall of the pipe body () is provided with a fin () protruding towards interior of the pipe body (), the fin () spirally extends in an axial direction of the pipe body (), wherein a height of the fin () gradually increases from one end in at least a part extension of the fin. The heat transfer enhancement pipe can reduce thermal stress of itself, thereby increasing service life of the heat transfer enhancement pipe.

A heat transfer tube includes a twisted baffle arranged in an inner wall of the tube. The twisted baffle extends spirally along an axial direction of the heat transfer tube. The twisted baffle is provided with a non-through gap extending along an axial direction of the heat transfer tube from an end to the other end of the twisted baffle. A cracking furnace uses the heat transfer tube. The heat transfer tube and cracking furnace have good heat transfer effects and small pressure loss.

Heat transfer tube and cracking furnace using the same

The present disclosure provides a steam cracking process, comprising heating a liquid feed stock in a convection section of a cracking furnace and subsequently conveying the material to a radiant section of the cracking furnace for cracking reaction therein, wherein a monoolefin-containing stream is conveyed to the cracking furnace for cracking reaction through at least one of modes A to C.

Steam cracking processes

The present disclosure relates to a heat transfer tube and a cracking furnace using the heat transfer tube. The heat transfer tube comprises a twisted baffle arranged in an inner wall of the tube, said twisted baffle extending spirally along an axial direction of the heat transfer tube. The twisted baffle defines a closed circle viewed from an end of the heat transfer tube. Along the trajectory of the circle a casing is arranged, which is fixedly connected to a radial inner end of the twisted baffle. The twisted baffle is provided with a plurality of holes. The heat transfer tube according to the present disclosure has a good heat transfer effect and small pressure loss.

Heat transfer tube and cracking furnace using the heat transfer tube

This invention relates to a tubular cracking furnace, especially an ethylene cracking furnace, which comprises a convection section and a or dual radiant section(s), at least one heat transfer intensifying member arranged in at least one pass each radiant tube in said radiant section, said at least one heat transfer intensifying member comprises a first heat transfer intensifying member, which is arranged at a location between 10D and 25D upstream of the extreme point of said at least one pass radiant tube metal temperature, wherein D is the inner diameter of the radiant tube having heat transfer intensifying members. The present invention could achieve the best enhanced heat transfer result with given number of heat transfer intensifying member, by optimizing the locations of heat transfer intensifying members in the radiant tube.

Tubular cracking furnace

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Beijing, China

Zhiguo Du