Patent ID: 11946004
Assignee: ZHENHAI PETROCHEMICAL JIANAN ENGINEERING CO., LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  F | IPC B  C  F

Claim 7:
8. The atmospheric-vacuum heat exchange system of claim 7, further comprising an electric desalting unit (9);
the connections among the first heat exchanging group, the electric desalting unit (9), the primary distillation tower (4) or flash tower, the second heat exchanging group, the atmospheric furnace (5), the atmospheric tower (6), the vacuum furnace (7) and the vacuum tower (8) are as follows:
the first heat exchanging group comprises a first three-stream winding-tube heat exchanger (31), a second three-stream winding-tube heat exchanger (32), a third three-stream winding-tube heat exchanger (33), a first single-stream winding-tube heat exchanger (11), a first two-stream winding-tube heat exchanger (21), a second two-stream winding-tube heat exchanger (22), a third two-stream winding-tube heat exchanger (23), a fourth two-stream winding-tube heat exchanger (24) and a fourth three-stream winding-tube heat exchanger (34);
the second heat exchanging group comprises a fifth two-stream winding-tube heat exchanger (25), a fifth three-stream winding-tube heat exchanger (35) and a second single-stream winding-tube heat exchanger (12);
a pipe (A) used for feeding the crude oil is divided into two sections, the first section of the pipe (A) is successively connected to the shell passage of the first three-stream winding-tube heat exchanger (31) and the shell passage of the second three-stream winding-tube heat exchanger (32), and the second section of the pipe (A) is successively connected to the shell passage of the third three-stream winding-tube heat exchanger (33), the shell passage of the first single-stream winding-tube heat exchanger (11) and the shell passage of the first two-stream winding-tube heat exchanger (21);
the pipes from the shell passage of the second three-stream winding-tube heat exchanger (32) and the shell passage of the first two-stream winding-tube heat exchanger (21) are merged to form one pipe and then connected to the electric desalting unit (9);
the pipe from the electric desalting unit (9) is divided into two pipes, the first pipe is successively connected to the shell passage of the second two-stream winding-tube heat exchanger (22) and the shell passage of the third two-stream winding-tube heat exchanger (23), and the second pipe is successively connected to the shell passage of the fourth two-stream winding-tube heat exchanger (24) and the shell passage of the fourth three-stream winding-tube heat exchanger (34);
the pipes from the shell of the third two-stream winding-tube heat exchanger (23) and the shell passage of the fourth three-stream winding-tube heat exchanger (34) are merged into one pipe and then connected to the primary distillation tower (4) or flash tower;
the pipe from the primary distillation tower (4) or flash tower is successively connected to the shell passage of the fifth two-stream winding-tube heat exchanger (25), the shell passage of the fifth three-stream winding-tube heat exchanger (35) and the shell passage of the second single-stream winding-tube heat exchanger (12); and
the pipe from the shell passage of the second single-stream winding-tube heat exchanger (12) is connected to the atmospheric furnace (5), the atmospheric tower (6) connected between the atmospheric furnace (5) and the vacuum furnace (7), the vacuum furnace (7) connected between the atmospheric tower (6) and the vacuum tower (8);
the top pipeline (41) of the primary distillation tower (4) or flash tower is divided into two pipes respectively connected to the tube passage of the first three-stream winding-tube heat exchanger (31) and the tube passage of the third three-stream winding-tube heat exchanger (33);
a second circulating return pipeline (61) in the middle portion of the atmospheric tower (6) is connected to the tube passage of the fifth two-stream winding-tube heat exchanger (25) and then returns to the atmospheric tower (6);
a first circulating return pipeline (62) in the middle portion of the atmospheric tower (6) is connected to the tube passage of the second two-stream winding-tube heat exchanger (22) and then returns to the atmospheric tower (6);
a third lateral line (63) in the middle portion of the atmospheric tower (6) is successively connected to the tube passage of the fifth three-stream winding-tube heat exchanger (35), the tube passage of the fourth three-stream winding-tube heat exchanger (34) and the tube passage of the second three-stream winding-tube heat exchanger (32), and then connected to the downstream;
the middle portion of the atmospheric tower (6) is connected to an atmospheric stripping tower (64), a second pipeline (65) on the bottom of the atmospheric stripping tower (64) is successively connected to the tube passage of the fourth three-stream winding-tube heat exchanger (34) and the tube passage of the second three-stream winding-tube heat exchanger (32) and then connected to the downstream, and a first lateral line (66) in the middle portion of the atmospheric stripping tower (64) is successively connected to the tube passage of the second two-stream winding-tube heat exchanger (22) and the tube passage of the second three-stream winding-tube heat exchanger (32) and then connected to the downstream;
a second lateral line (67) in the upper portion of the atmospheric tower (6) is connected to the tube passage of the first single-stream winding-tube heat exchanger (11), the pipe from the first single-steam winding-tube heat exchanger (11) is divided into two pipes, the first pipe is connected to the tube passage of the first three-stream winding-tube heat exchanger (31), and the second pipe is connected to the tube passage of the third three-stream winding-tube heat exchanger (33) and then connected to the downstream;
a first pipeline (68) on the top of the atmospheric tower (6) is divided into two pipes respectively connected to the tube passage of the first three-stream winding-tube heat exchanger (31) and the tube passage of the third three-stream winding-tube heat exchanger (33) and then connected to the downstream;
a third circulating return pipeline (81) in the lower portion of the vacuum tower (8) is successively connected to the tube passage of the fifth three-stream winding-tube heat exchanger (35) and the tube passage of the fifth two-stream winding-tube heat exchanger (25), and the pipe from the tube passage of the fifth two-stream winding-tube heat exchanger (25) is divided into two pipes, one of which is connected to the tube passage of the fourth two-stream winding-tube heat exchanger (24) and then connected to the downstream and the other one of which returns to the vacuum tower (8);
a fourth circulating return pipeline (82) in the middle portion of the vacuum tower (8) is successively connected to the tube passage of the fourth three-stream winding-tube heat exchanger (34), the tube passage of the fourth two-stream winding-tube heat exchanger (24) and the tube passage of the first two-stream winding-tube heat exchanger (21), and the pipe from the tube passage of the first two-stream winding-tube heat exchanger (21) is divided into two pipes, one of which is connected to the downstream and the other one of which returns to the vacuum tower (8); and
a vacuum residue pipeline (83) on the bottom of the vacuum tower (8) is successively connected to the tube passage of the second single-stream winding-tube heat exchanger (12) and the tube passage of the fifth three-stream winding-tube heat exchanger (35), and the pipe from the tube passage of the fifth three-stream winding-tube heat exchanger (35) is divided into two pipes, one of which is connected to one tube passage of the third two-stream winding-tube heat exchanger (23), then to the tube passage of the first two-stream winding-tube heat exchanger (21) and to the downstream, and the other one of which is connected to the other tube passage of the third two-stream winding-tube heat exchanger (23) and returns to the vacuum tower (8).