US 11,946,004 B2
Atmospheric-vacuum heat exchange system having coil-wound heat exchangers, and heat exchange process
Jianliang Wang, Ningbo (CN); Xianan Zhang, Ningbo (CN); Huili Ma, Ningbo (CN); Xingmiao Hu, Ningbo (CN); Hongliang Ren, Ningbo (CN); Yu Wang, Ningbo (CN); Jiang Tao, Ningbo (CN); and Jiaoyue Cui, Ningbo (CN)
Assigned to Zhenhai Petrochemical Jianan Engineering Co., Ltd., Ningbo (CN)
Appl. No. 17/597,840
Filed by Zhenhai Petrochemical Jianan Engineering Co., Ltd., Ningbo (CN)
PCT Filed Apr. 1, 2020, PCT No. PCT/CN2020/082663
§ 371(c)(1), (2) Date Jan. 26, 2022,
PCT Pub. No. WO2021/017514, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 201910687963.6 (CN), filed on Jul. 29, 2019.
Prior Publication US 2022/0315842 A1, Oct. 6, 2022
Int. Cl. C10G 7/00 (2006.01); B01D 3/06 (2006.01); B01D 3/10 (2006.01); B01D 3/14 (2006.01); F28D 7/02 (2006.01); F28D 7/16 (2006.01); F28D 21/00 (2006.01)
CPC C10G 7/00 (2013.01) [B01D 3/06 (2013.01); B01D 3/10 (2013.01); B01D 3/143 (2013.01); F28D 7/024 (2013.01); F28D 7/1676 (2013.01); C10G 2300/107 (2013.01); C10G 2300/1077 (2013.01); C10G 2300/4006 (2013.01); C10G 2300/4081 (2013.01); F28D 2021/0059 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An atmospheric-vacuum heat exchange system with a winding-tube heat exchanger, comprising:
a first heat exchanging group with a crude oil output for performing primary heat exchange on crude oil;
a primary distillation tower (4) or flash tower, for performing primary distillation on the crude oil, connected to the crude oil output of the first heat exchanging group;
a second heat exchanging group for performing secondary heat exchange on a primary bottom oil or flash bottom oil obtained after primary distillation being connected to a bottom of the primary distillation tower (4) or flash tower, having a primary bottom oil output or a flash bottom oil output;
an atmospheric furnace (5), connected to the primary bottom oil output or flash bottom oil output of the second heat exchanging group;
an atmospheric tower (6);
a vacuum furnace (7); and
a vacuum tower (8) connected to the vacuum furnace;
wherein,
the atmospheric tower (6) is connected between the atmospheric furnace (5) and the vacuum furnace (7), the vacuum furnace (7) is connected between the atmospheric tower (6) and the vacuum tower (8);
the crude oil or the primary bottom oil or flash bottom oil from the primary distillation tower (4) or flash tower or/and the atmospheric tower (6) or/and the vacuum tower (8) is inputted into the first heat exchanging group and the second heat exchanging group according to required working conditions, so as to heat the crude oil, and to heat the primary bottom oil or flash bottom oil;
heat exchangers in the first heat exchanging group and/or the second heat exchanging group are winding-tube heat exchangers, each winding-tube heat exchanger comprises:
a shell-pass cylinder (370) having two ends;
a first shell-pass connecting tube (371) and a second shell-pass connecting tube (372) both connected to the shell-pass cylinder (370);
a first tube plate (330) and a second tube plate (340) respectively attached to each end of the shell-pass cylinder (370);
a plurality of first tube box (310) connected to the first tube plate (330);
a plurality of second tube box (320) connected to the second tube plate (340);
a plurality of heat exchange tubes (360) each having two ends disposed inside the shell-pass cylinder (370);
wherein, a shell passage for the crude oil or the primary bottom oil or flash bottom oil to flow through is formed by the first shell-pass connecting tube (371), the second shell-pass connecting tube (372) and the shell-pass cylinder (370);
two ends of each heat exchange tube (360) are respectively connected to the first tube plate (330) and the second tube plate (340), and respectively communicated with the corresponding first tube box (310) and the corresponding second tube box (320), to form a plurality of tube passages for the crude oil or the primary bottom oil or flash bottom oil to pass through;
each heat exchange tube (360) is spirally wounded along the axial direction of the shell-pass cylinder (370) with multiple spiral tube layers, and each spiral tube layer has a plurality of wounded heat exchanging tubes;
the number of the plurality of tube box (310) is N, and each first tube box (310) in the plurality of tube box is independently disposed on the first tube plate (330);
the number of the plurality of second tube box (320) is N, and each second tube box (320) in the plurality of second box is corresponding to the first tube box (310) and independently disposed on the second tube plate (340);
each spiral tube layer has N group(s) of the wounded heat exchange tubes (360), and two ends of each group of the heat exchange tubes (360) are respectively connected to the corresponding first and second tube boxes (310, 320); and
N is a natural number greater than or equal to 1.