Device for increasing benzene feeding temperature of ethylbenzene unit

Abstract

The utility model belongs to the field of styrene production, and discloses a device for increasing the benzene feeding temperature of an ethylbenzene unit, which comprises a pipe layer feeding pipeline (1), a preheater (2), a pipe layer bypass (3), a pipe layer discharging pipeline (4), a shell layer feeding pipeline (5), a shell layer discharging pipeline (6), a shell layer bypass (7), a temperature control pipeline (8) and a temperature sensor (9). According to the utility model, the preheater is additionally arranged to exchange heat with benzene in the boundary area, so that the benzene feeding temperature is increased, and energy is saved.

Description

Technical Field

[0001] The utility model belongs to the field of styrene production, in particular to a device for increasing the feed temperature of ethylbenzene unit benzene. Background Art

[0002] In the ethylbenzene distillation unit of styrene production, the top of the polyethylbenzene tower is about 130°C. In the original process flow, a cooling water heat exchanger is used at the top of the tower to cool the material at the top of the polyethylbenzene tower. The material temperature after cooling is about 40°C. However, this direct cooling method will cause energy waste, and the benzene feed in the ethylbenzene unit needs to be heated, so it is necessary to design a device to recover the heat energy of the high-temperature material. Utility Model Content

[0003] The technical problem to be solved by the utility model is that the method of using a cooling water heat exchanger to cool the material at the top of a polyethylbenzene tower will cause energy waste.

[0004] In order to solve the above technical problems, the specific technical solutions of the utility model are as follows:

[0005] A device for increasing the feed temperature of ethylbenzene unit benzene, comprising a tube layer feed pipeline 1, a preheater 2, a tube layer bypass 3, a tube layer discharge pipeline 4, a shell layer feed pipeline 5, a shell layer discharge pipeline 6, a shell layer bypass 7, a temperature control pipeline 8 and a temperature sensor 9;

[0006] The top discharge of the polyethylbenzene tower T-203 is provided with a shell layer feed pipeline 5 connected to the shell layer of the preheater 2, and the shell layer feed pipeline 5 is provided with a fourth valve 13;

[0007] The discharge port of the preheater 2 is provided with a shell discharge pipeline 6, and a ninth valve 18 is provided on the shell discharge pipeline 6;

[0008] After passing through the clay reactor, benzene from the boundary zone is connected to the tube layer of the preheater 2 through the tube layer feed pipeline 1, and a first valve 10 is provided on the tube layer feed pipeline 1;

[0009] The outlet of the preheater 2 is provided with a tube layer discharge pipeline 4, and a third valve 12 is provided on the tube layer discharge pipeline 4; the tube layer discharge pipeline 4 is connected to the benzene tower reflux tank V-201;

[0010] The shell layer feed pipeline 5 and the shell layer discharge pipeline 6 are provided with a shell layer bypass 7, and the shell layer bypass 7 is provided with an eighth valve 17 and a temperature control valve pipeline 8 in parallel, and the temperature control valve pipeline 8 is provided with a fifth valve 14, a seventh valve 16 and a temperature control valve 15;

[0011] A pipe layer bypass 3 is provided between the pipe layer feed pipe 1 and the pipe layer discharge pipe 4, and a second valve 11 is provided on the pipe layer bypass 3;

[0012] A temperature sensor 9 is provided on the tube layer discharge pipeline 4 , and the temperature sensor 9 is connected to the temperature control valve pipeline 8 .

[0013] The utility model has the following advantages: the preheater is added to exchange heat with the boundary benzene, thereby increasing the benzene feed temperature and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the device for high ethylbenzene unit benzene feed temperature of the utility model. DETAILED DESCRIPTION

[0015] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0016] like Figure 1 As shown, the device for increasing the feed temperature of ethylbenzene unit benzene of the utility model is characterized by comprising a tube layer feed pipeline 1, a preheater 2, a tube layer bypass 3, a tube layer discharge pipeline 4, a shell layer feed pipeline 5, a shell layer discharge pipeline 6, a shell layer bypass 7, a temperature control pipeline 8, a temperature sensor 9, a first valve 10, a second valve 11, a third valve 12, a fourth valve 13, a fifth valve 14, a temperature control valve 15, a seventh valve 16, an eighth valve 17, and a ninth valve 18;

[0017] The top discharge of the polyethylbenzene tower T-203 is provided with a shell layer feed pipeline 5 connected to the shell layer of the preheater 2, and the shell layer feed pipeline 5 is provided with a fourth valve 13;

[0018] The discharge port of the preheater 2 is provided with a shell discharge pipeline 6, and a ninth valve 18 is provided on the shell discharge pipeline 6;

[0019] Benzene passes through the clay reactor R-201 / S (one in operation and one in standby) from the boundary zone, and is connected to the tube layer of the preheater 2 through the tube layer feed pipeline 1, and the first valve 10 is provided on the tube layer feed pipeline 1;

[0020] The outlet of the preheater 2 is provided with a tube layer discharge pipeline 4, on which a third valve 12 is provided; the tube layer discharge pipeline 4 is connected to the benzene tower reflux tank V-201.

[0021] The shell feed pipeline 5 and the shell discharge pipeline 6 are provided with a shell bypass 7, the shell bypass 7 is provided with an eighth valve 17 and a temperature control valve pipeline 8 in parallel, and the temperature control valve pipeline 8 is provided with a fifth valve 14, a seventh valve 16 and a temperature control valve 15.

[0022] A pipe layer bypass 3 is arranged between the pipe layer feed pipeline 1 and the pipe layer discharge pipeline 4 , and a second valve 11 is arranged on the pipe layer bypass 3 .

[0023] A temperature sensor 9 is provided on the tube layer discharge pipeline 4 , and the temperature sensor 9 is connected to the temperature control valve pipeline 8 .

[0024] The benzene feed temperature can be adjusted by controlling the opening of the temperature control valve.

[0025] When in use: confirm that the second valve 11 of the preheater tube layer bypass pipeline 3 is open, slightly open the first valve 10 of the preheater tube layer feed pipeline 1, slowly open the third valve 12 of the preheater tube discharge pipeline 4, open the first valve 10 of the preheater tube layer feed pipeline 1, and slowly close the second valve 11 of the preheater tube layer bypass pipeline 3. The cold medium is put into use.

[0026] Confirm that the eighth valve 17 of the preheater shell bypass pipeline 7 is open, open the fourth valve 13 of the preheater shell feed pipeline 5, slowly open the ninth valve 18 of the preheater shell discharge pipeline 6, open the fifth valve 14 and the seventh valve 16 of the temperature control valve pipeline 8 before and after the temperature control valve 15, and close the eighth valve 17 of the preheater shell bypass pipeline 7. The heat medium is put into use.

[0027] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make several modifications and improvements without departing from the principle of the present invention, and these modifications and improvements should also be considered to belong to the protection scope of the present invention.

Claims

1. A device for increasing the feed temperature of ethylbenzene unit benzene, characterized in that: It comprises a tube layer feed pipeline (1), a preheater (2), a tube layer bypass (3), a tube layer discharge pipeline (4), a shell layer feed pipeline (5), a shell layer discharge pipeline (6), a shell layer bypass (7), a temperature control pipeline (8) and a temperature sensor (9); The top discharge of the polyethylbenzene tower T-203 is provided with a shell layer feed pipeline (5) connected to the shell layer of the preheater (2), and the shell layer feed pipeline (5) is provided with a fourth valve (13); The discharge port of the preheater (2) is provided with a shell discharge pipeline (6), and a ninth valve (18) is provided on the shell discharge pipeline (6); After passing through the clay reactor, benzene from the boundary zone is connected to the tube layer of the preheater (2) through a tube layer feed pipeline (1), and a first valve (10) is provided on the tube layer feed pipeline (1); The preheater (2) tube layer outlet is provided with a tube layer discharge pipeline (4), and a third valve (12) is provided on the tube layer discharge pipeline (4); the tube layer discharge pipeline (4) is connected to the benzene tower reflux tank V-201; The shell layer feed pipeline (5) and the shell layer discharge pipeline (6) are provided with a shell layer bypass (7), the shell layer bypass (7) is provided with an eighth valve (17) and a temperature control pipeline (8) connected in parallel, and the temperature control pipeline (8) is provided with a fifth valve (14), a seventh valve (16) and a temperature control valve (15); A pipe layer bypass (3) is provided between the pipe layer feed pipe (1) and the pipe layer discharge pipe (4), and a second valve (11) is provided on the pipe layer bypass (3); A temperature sensor (9) is provided on the tube layer discharge pipeline (4), and the temperature sensor (9) is connected to the temperature control pipeline (8).

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