A heat exchanger for mixed benzene hydrogenation reaction

Abstract

This utility model relates to the field of petroleum processing technology, specifically a heat exchanger for a mixed benzene hydrogenation reaction. It includes a feeding unit, a heat exchange unit, a left longitudinal pipe, a right longitudinal pipe, and two feed pipes. The feed ends of the two feed pipes are connected via the left longitudinal pipe, and the discharge ends of the two feed pipes are connected via the right longitudinal pipe. The left longitudinal pipe is connected to a conveying pipe, and the right longitudinal pipe is connected to the heat exchange unit. The feed pipes are separated by a filter screen and connected to a drain pipe and a cleaning pipe. A first valve and a second valve are respectively installed on the cleaning pipe and the drain pipe. A first solenoid valve is installed at the feed end of the feed pipe, and a second solenoid valve is installed at the discharge end of each feed pipe. The use of this application, by utilizing the filter screen, prevents impurities from entering the heating unit, thereby ensuring the normal operation of the heat exchanger. Simultaneously, by setting up two feed pipes, one can be used for oil intake while the other is used for cleaning, thus achieving backwashing of the filter screen without affecting normal heat exchange.

Description

Technical Field

[0001] The utility model belongs to the technical field of petroleum processing, in particular to a heat exchanger for mixed benzene hydrogenation reaction. Background Art

[0002] Hydrocracking technology is an important technology for deep processing of crude oil. It is also the only means to directly produce high-quality chemical raw materials when the raw materials are lightened. In recent years, hydrocracking technology has become a bridge technology for modern refining enterprises. Hydrocracking is a process in which heavy oil containing mixed benzene is hydrogenated, cracked and isomerized by the action of hydrogen catalyst under high pressure and temperature during the refining process of petroleum, and converted into light oil (gasoline, kerosene, diesel, or raw materials for catalytic cracking and cracking to produce olefins).

[0003] In the hydrocracking reaction, the heavy oil mixed with benzene needs to be mixed with hydrogen and heated first, and then mixed with a catalyst and added. When the mixed heavy oil and hydrogen are heated, a heat exchanger is often used for heating.

[0004] The heat pipe heat exchanger mainly includes a feed area and a heat exchange area. Since heavy oil contains a certain amount of impurities, when using the existing heat exchanger for heating, long-term use often causes blockage of the heat exchange area of ​​the heat exchanger, thereby affecting its normal use. Utility Model Content

[0005] The utility model provides a heat exchanger for mixed benzene hydrogenation reaction, which is used to solve the defects in the prior art.

[0006] The utility model is realized through the following technical solutions:

[0007] A heat exchanger for mixed benzene hydrogenation reaction comprises a feed unit, a heat exchange unit, a left longitudinal pipe and a right longitudinal pipe with two ends being closed, wherein the feed unit comprises two feed pipes arranged in parallel, the feed ends of the two feed pipes are connected via the left longitudinal pipe, the discharge ends of the two feed pipes are connected via the right longitudinal pipe, the left longitudinal pipe is connected with a conveying pipe, and the right longitudinal pipe is connected with the heat exchange unit; the feed pipe is separated by a filter screen, the feed pipe is connected with a sewage pipe and a cleaning pipe located on both sides of the filter screen from left to right in sequence, the cleaning pipe and the sewage pipe are respectively provided with a first valve and a second valve, the feed end of the feed pipe is provided with a first solenoid valve, and the discharge end of the feed pipe is provided with a second solenoid valve.

[0008] When the present application is in use, the mixed heavy oil enters the left longitudinal pipe through the feed pipe, wherein the first solenoid valve on one of the two feed pipes is opened and the second solenoid valve is opened, and the first solenoid valve and the second solenoid valve on the other feed pipe are closed, so that the heavy oil can pass through one of the feed pipes, and enter the right longitudinal pipe through the feed pipe and enter the heat exchange unit through the right longitudinal pipe, wherein the impurities are blocked by the filter screen in the improved feed pipe. After the heavy oil has been passed for a certain period of time, the opened first solenoid valve is closed, and the closed first solenoid valve is opened, so that the heavy oil enters the other feed pipe and flows into the heating unit, wherein the first valve and the second valve are opened corresponding to the vacant feed pipe, so that the cleaned medium enters the feed pipe through the cleaning pipe and backwashes the filter screen and is discharged from the sewage pipe, realizing the backwashing of the filter screen. At the same time, the other feed pipe repeats the above action to clean the feed pipe after being used for a period of time. Thereby, it can not only prevent impurities from entering the heating unit, but also realize the backwashing of the filter screen without affecting the normal heat exchange.

[0009] Preferably, an upper longitudinal pipe is provided above the cleaning pipe, and the cleaning pipes are all connected to the upper longitudinal pipe, and the two ends of the upper longitudinal pipe are respectively connected to a water inlet pipe and an air inlet pipe, and a water inlet valve and an air inlet valve are respectively provided on the water inlet pipe and the air inlet pipe. Cleaning water can be introduced through the water inlet pipe to clean the filter first, and dry gas can be introduced through the air inlet pipe to air dry the filter, thereby shortening the drying time of the filter and enabling rapid use.

[0010] Preferably, a pressure gauge is provided on the feed pipe, and the pressure gauge is located between the filter screen and the feed pipe. The pressure gauge can observe the pressure between the feed pipe and the filter screen on the feed pipe. When the filter screen is blocked, the pressure will increase, thereby alerting the staff.

[0011] Preferably, the cleaning pipe is arranged upward and the sewage pipe is arranged downward.

[0012] Preferably, the filter screen is a spherical structure concave along the conveying direction, which can increase the filter screen area and achieve better filtering effect while satisfying the requirement of filtering heavy oil in the feed pipe.

[0013] The beneficial effects of the utility model are as follows: the use of the present application can prevent impurities from entering the heating unit by utilizing the filter setting, thereby ensuring the normal use of the heat exchanger. At the same time, by arranging two feed pipes, it can be ensured that one can infuse oil while the other can be clear, thereby achieving backwashing of the filter without affecting normal heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 This is a connection arrangement diagram of the left longitudinal pipe, the right longitudinal pipe and the feed pipe viewed from top to bottom.

[0017] As shown in the figure:

[0018] 1. Heat exchange unit, 2. Left longitudinal pipe, 3. Right longitudinal pipe, 4. Feed pipe, 5. Transport pipe, 6. Filter, 7. Drain pipe, 8. Cleaning pipe, 9. First valve, 10. Second valve, 11. First solenoid valve, 12. Second solenoid valve, 13. Upper longitudinal pipe, 14. Water inlet pipe, 15. Air inlet pipe, 16. Water inlet valve, 17. Air inlet valve, 18. Pressure gauge. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] A heat exchanger for mixed benzene hydrogenation reaction, such as Figure 1 and Figure 2 As shown, it includes a feed unit, a heat exchange unit 1, and a left longitudinal pipe 2 and a right longitudinal pipe 3 with closed ends. The feed unit includes two feed pipes 4 arranged in parallel. The feed ends of the two feed pipes 4 are connected through the left longitudinal pipe 2, and the discharge ends of the two feed pipes 4 are connected through the right longitudinal pipe 3. The left longitudinal pipe 2 is connected with a conveying pipe 5, and the right longitudinal pipe 3 is connected with a heat exchange unit 1; the feed pipe 4 is separated by a filter 6, and the feed pipe 4 is connected with a sewage pipe 7 and a cleaning pipe 8 located on both sides of the filter 6 from left to right in sequence. The cleaning pipe 8 is arranged upward, and the sewage pipe 7 is arranged downward. The cleaning pipe 8 and the sewage pipe 7 are respectively provided with a first valve 9 and a second valve 10, the feed end of the feed pipe 4 is provided with a first solenoid valve 11, and the discharge end of the feed pipe 4 is provided with a second solenoid valve 12. The heat exchange unit 1 is a heat exchange zone of a heat exchanger, which is a prior art, so it will not be described in detail.

[0021] An upper longitudinal tube 13 with closed ends is provided above the cleaning tube 8, and the cleaning tubes 8 are connected to the upper longitudinal tube 13. The two sides of the upper longitudinal tube 13 are respectively connected to a water inlet pipe 14 and an air inlet pipe 15, and the water inlet pipe 14 and the air inlet pipe 15 are respectively provided with a water inlet valve 16 and an air inlet valve 17.

[0022] When the present application is in use, the mixed heavy oil enters the left longitudinal pipe 2 through the delivery pipe 5, wherein the first solenoid valve 11 and the second solenoid valve 12 on one of the two feed pipes 4 are opened, and the first solenoid valve 11 and the second solenoid valve 12 on the other feed pipe 4 are closed, so that the heavy oil can pass through the feed pipe 4 with the first solenoid valve 11 and the second solenoid valve 12 opened, and enter the right longitudinal pipe 3 through the feed pipe 4 and enter the heat exchange unit 1 through the right longitudinal pipe 3, wherein impurities are blocked by the filter screen 6 in the feed pipe 4. After the heavy oil has been passed for a certain period of time, the opened first solenoid valve 11 is closed, and the closed first solenoid valve 11 is opened, so that the heavy oil enters another feed pipe 4 and flows into the heating unit, wherein, corresponding to the vacant feed pipe 4, the first valve 9, the second valve 10 and the water inlet valve 16 are opened, so that the cleaning water enters the upper longitudinal pipe 13 through the water inlet pipe 14 and enters the cleaning pipe 8 through the upper longitudinal pipe 13, and enters the feed pipe 4 through the cleaning pipe 8 and backwashes the filter 6 and is discharged from the sewage pipe 7, and then the water inlet valve 16 is closed and the air inlet valve 17 is opened, and the dry gas can enter through the air inlet pipe 15 to air dry the filter 6, thereby shortening the drying time of the filter 6, and can be quickly put into use, and backwashing and drying of the filter 6 are realized. At the same time, the other feed pipe 4 repeats the above action to clean the feed pipe 4 after being used for a period of time. Thereby, it can not only prevent impurities from entering the heating unit, but also realize backwashing of the filter 6 without affecting the normal heat exchange.

[0023] A pressure gauge 18 is provided on the feed pipe 4, and the pressure gauge 18 is located between the filter screen 6 and the feed pipe 5. The pressure gauge 18 can observe the pressure between the feed pipe 5 and the filter screen 6 on the feed pipe 4. When the filter screen 6 is blocked, the pressure will increase, thereby playing a role in reminding the staff.

[0024] The filter screen 6 is a spherical structure concave along the conveying direction, which can increase the area of ​​the filter screen 6 and achieve a better filtering effect while satisfying the requirement of filtering the heavy oil in the feed pipe 4.

[0025] The use of the present application utilizes the setting of the filter 6 to prevent impurities from entering the heating unit, thereby ensuring the normal use of the heat exchanger. At the same time, by setting two feed pipes 4, it can be ensured that one can infuse oil while the other can be clear, thereby achieving backwashing of the filter 6 without affecting the normal heat exchange.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A heat exchanger for mixed benzene hydrogenation reaction, characterized in that: It includes a feeding unit, a heat exchange unit, a left longitudinal pipe and a right longitudinal pipe with two ends closed separately. The feeding unit includes two feeding pipes arranged in parallel. The feeding ends of the two feeding pipes are connected via the left longitudinal pipe, and the discharging ends of the two feeding pipes are connected via the right longitudinal pipe. The left longitudinal pipe is connected with a conveying pipe, and the right longitudinal pipe is connected with a heat exchange unit. The feed pipe is separated by a filter screen, and the feed pipe is connected with a sewage pipe and a cleaning pipe located on both sides of the filter screen from left to right in sequence. The cleaning pipe and the sewage pipe are respectively provided with a first valve and a second valve. A first solenoid valve is provided at the feeding end of the feed pipe, and a second solenoid valve is provided at the discharging end of the feed pipe.

2. The heat exchanger for mixed benzene hydrogenation reaction according to claim 1, characterized in that: An upper longitudinal pipe is arranged above the cleaning pipe, and the cleaning pipes are all connected with the upper longitudinal pipe. The two ends of the upper longitudinal pipe are respectively connected with a water inlet pipe and an air inlet pipe, and a water inlet valve and an air inlet valve are respectively arranged on the water inlet pipe and the air inlet pipe.

3. The heat exchanger for mixed benzene hydrogenation reaction according to claim 1, characterized in that: A pressure gauge is provided on the feed pipe and is located between the filter screen and the feed pipe.

4. The heat exchanger for mixed benzene hydrogenation reaction according to claim 1, characterized in that: The cleaning pipe is arranged upwards, and the sewage pipe is arranged downwards.

5. The heat exchanger for mixed benzene hydrogenation reaction according to claim 1, characterized in that: The filter screen is a spherical structure that is concave along the conveying direction.

Images