Heat exchange system of reaction unit in coal tar hydrogenation process

Abstract

The utility model belongs to the technical field of coal tar hydrogenation process, and relates to a heat exchange system of a reaction unit in the coal tar hydrogenation process, which comprises a heat exchanger, a first feeding pipeline, a second feeding pipeline, a second discharging pipeline, a first bypass pipeline and an adjusting component, the first feeding pipeline is communicated with the shell side; the second feeding pipeline is communicated with the tube pass; the inlet end of the second discharging pipeline is communicated with the outlet end of the tube pass; the first bypass pipeline is communicated with the second feeding pipeline, and the first bypass pipeline is communicated with the second discharging pipeline; the adjusting assembly is mounted on the second feeding pipeline; when the temperature of a reaction product is higher than that of a reaction feeding material, the reaction feeding material is preheated through the reaction product in the shell pass; and when the temperature of the reaction product is lower than that of the reaction feed, the situation that the reaction feed enters the heat exchanger and is subjected to reverse heat absorption is avoided, the situation that more energy needs to be consumed for heating the reaction feed subsequently is avoided, and then energy waste is avoided.

Description

Technical Field

[0001] This utility model relates to the field of coal tar hydrogenation process technology, specifically to a heat exchange system for a reaction unit in a coal tar hydrogenation process. Background Technology

[0002] The heat exchange network of the reaction unit in a coal tar hydrogenation plant is the core system for achieving energy recovery and reducing energy consumption. In a coal tar hydrogenation plant, shell-and-tube heat exchangers are used to transfer heat from the reaction products (generally from high-temperature exhaust gas in the coal tar hydrogenation process) to the low-temperature feedstock, thereby preheating the feedstock through energy saving and consumption reduction. Specifically, the reaction products are located in the shell side of the shell-and-tube heat exchanger, and the low-temperature feedstock is located in the tube side. Utilizing the heat exchange between the reaction products and the low-temperature feedstock, the temperature of the feedstock at the tube side outlet reaches the required temperature.

[0003] During normal operation of the coal tar hydrogenation unit's reaction unit, the temperature of the reaction products is higher than that of the low-temperature reaction feed. A shell-and-tube heat exchanger can be used to preheat the low-temperature reaction feed, saving energy consumption required for preheating. However, in actual operation, it has been found that due to catalyst deactivation or improper operation, the temperature of the reaction products may be lower than that of the reaction feed. In this case, using the reaction products to preheat the reaction feed results in reverse heat exchange between the products and the feed in the heat exchanger. That is, the reaction feed in the tube side is "reversely absorbed" by the reaction products in the shell side, leading to an even lower temperature of the reaction feed at the tube side outlet. This reverse heat exchange forces the reaction feed to consume more energy for subsequent heating, resulting in energy waste. Utility Model Content

[0004] To address the technical problem in the prior art where the reaction feed in the tube side is "reversely absorbed heat" by the reaction products in the shell side, resulting in the temperature of the reaction feed at the tube side outlet being lower than the required value, and thus requiring additional fuel consumption to maintain its process temperature, this invention provides a heat exchange system for the reaction unit in a coal tar hydrogenation process.

[0005] In the coal tar hydrogenation process of this invention, the heat exchange system of the reaction unit preheats the reaction feed when the temperature of the reaction product is higher than the temperature of the reaction feed. The system adjusts the second feed line to be connected to the heat exchanger and disconnected from the first bypass line via an adjusting component. In this case, the reaction product in the shell side preheats the reaction feed. When the temperature of the reaction product is lower than the temperature of the reaction feed, the system adjusts the second feed line to be disconnected from the heat exchanger and connected to the first bypass line via the adjusting component. This prevents the reaction feed from being "reversely absorbed" into the heat exchanger, avoiding the need for additional energy consumption for heating and thus preventing energy waste.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A heat exchange system for a reaction unit in a coal tar hydrogenation process includes a heat exchanger, a first feed line, a second feed line, a second discharge line, a first bypass line, and a regulating component. The heat exchanger has a tube side and a shell side. The outlet end of the first feed line is connected to the inlet end of the shell side. The outlet end of the second feed line is connected to the inlet end of the tube side. The inlet end of the second discharge line is connected to the outlet end of the tube side. The inlet end of the first bypass line is connected to the second feed line, and the outlet end of the first bypass line is connected to the second discharge line. The regulating component is installed on the second feed line and is used to regulate the connection state between the heat exchanger and the first bypass line and the second feed line.

[0008] Optionally, the heat exchange system of the reaction unit in the coal tar hydrogenation process further includes: a second bypass pipeline, the inlet end of which is connected to the second feed pipeline, and the outlet end of which is connected to the second discharge pipeline.

[0009] Optionally, the first bypass line is located between the second bypass line and the heat exchanger.

[0010] Optionally, the flow rate of the second bypass line is greater than the flow rate of the first bypass line.

[0011] Optionally, the regulating assembly includes a first regulating valve: the first regulating valve is installed on the second feed line and is located between the heat exchanger and the first bypass line.

[0012] Optionally, the regulating assembly further includes a second regulating valve, which is installed on the first bypass line.

[0013] Optionally, the regulating assembly further includes a third regulating valve, which is installed on the second bypass line.

[0014] Optionally, the heat exchange system of the reaction unit in the coal tar hydrogenation process further includes: a regulating pipeline and a thermometer; one end of the regulating pipeline is connected to the first bypass pipeline, and the other end of the regulating pipeline is connected to the second discharge pipeline; the thermometer is installed on the regulating pipeline, the first bypass pipeline, the second bypass pipeline, or the second discharge pipeline.

[0015] Optionally, the heat exchange system of the reaction unit in the coal tar hydrogenation process further includes a pressure gauge, which is installed on the regulating pipeline, the first bypass pipeline, the second bypass pipeline, or the second discharge pipeline.

[0016] Optionally, the heat exchange system of the reaction unit in the coal tar hydrogenation process further includes: a temperature indicator controller, which is installed on the regulating pipeline, the first bypass pipeline, the second bypass pipeline, or the second discharge pipeline, and the temperature indicator controller is electrically connected to the second regulating valve, the thermometer, and the pressure gauge.

[0017] In summary, this utility model has the following beneficial technical effects:

[0018] In the coal tar hydrogenation process of this invention, the heat exchange system of the reaction unit preheats the reaction feed when the temperature of the reaction product is higher than the temperature of the reaction feed. The system adjusts the second feed line to be connected to the heat exchanger and disconnected from the first bypass line via an adjusting component. In this case, the reaction product in the shell side preheats the reaction feed. When the temperature of the reaction product is lower than the temperature of the reaction feed, the system adjusts the second feed line to be disconnected from the heat exchanger and connected to the first bypass line via the adjusting component. This prevents the reaction feed from being "reversely absorbed" into the heat exchanger, avoiding the need for additional energy consumption for heating and thus preventing energy waste. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the heat exchange system of the reaction unit in the coal tar hydrogenation process of this utility model.

[0020] Explanation of reference numerals in the attached drawings: 1. Heat exchanger; 2. First feed line; 3. Second feed line; 4. Second discharge line; 5. First bypass line; 6. Second bypass line; 7. First regulating valve; 8. Second regulating valve; 9. Third regulating valve; 10. Regulating line; 11. Thermometer; 12. Pressure gauge; 13. Temperature indicator controller. Detailed Implementation

[0021] The technical solution of this utility model will be further explained and described below with reference to the accompanying drawings and embodiments, but this utility model is not limited to the embodiments described below.

[0022] Reference Figure 1This utility model provides a heat exchange system for a reaction unit in a coal tar hydrogenation process, comprising: a heat exchanger 1, a first feed line 2, a second feed line 3, a second discharge line 4, a first bypass line 5, and a regulating component. The heat exchanger 1 has a tube side and a shell side; the outlet end of the first feed line 2 is connected to the inlet end of the shell side; the outlet end of the second feed line 3 is connected to the inlet end of the tube side; the inlet end of the second discharge line 4 is connected to the outlet end of the tube side; the inlet end of the first bypass line 5 is connected to the second feed line 3, and the outlet end of the first bypass line 5 is connected to the second discharge line 4; the regulating component is installed on the second feed line 3 and is used to adjust the connection state between the heat exchanger 1 and the first bypass line 5 and the second feed line 3. The heat exchanger 1 is a shell-and-tube heat exchanger. The reaction products are transported from the outlet end of the reaction unit to the inlet end of the shell side of heat exchanger 1, and a first discharge pipeline is provided at the outlet end of the shell side, through which the reaction products are led out.

[0023] The regulating assembly may include a first regulating valve 7: the first regulating valve 7 is installed on the second feed line 3 and is located between the heat exchanger 1 and the first bypass line 5. That is, when the temperature of the reaction product is lower than the temperature of the reaction feed, by adjusting the first regulating valve 7, the second feed line 3 is disconnected from the heat exchanger 1, and the reaction feed flows along the second feed line 3 and into the first bypass line 5, thereby preventing the reaction feed from undergoing "reverse heat absorption" with the reaction product in the shell side of the heat exchanger 1 in the tube side. The first regulating valve 7 can be a manual valve, a pneumatic valve, an electric valve, a solenoid valve, etc., and this utility model does not specifically limit it.

[0024] The regulating assembly may further include a second regulating valve 8. The second regulating valve 8 is installed on the first bypass line 5. That is, the second regulating valve 8 can precisely regulate the flow rate of the reaction feed flowing from the second feed line 3 into the first bypass line 5 to adapt to subsequent process requirements. The second regulating valve 8 can be a manual valve, a pneumatic valve, an electric valve, a solenoid valve, etc., and this utility model does not specifically limit it in this regard.

[0025] Reference Figure 1In some embodiments, the heat exchange system of the reaction unit in the coal tar hydrogenation process further includes a second bypass pipeline 6, the inlet end of which is connected to the second feed pipeline 3, and the outlet end of which is connected to the second discharge pipeline 4. That is, when the second feed pipeline 3 is not connected, the reaction feed flows from the second feed pipeline 3 through the first bypass pipeline 5 or the second bypass pipeline 6 to the second discharge pipeline 4, or the reaction feed flows from the second feed pipeline 3 through the first bypass pipeline 5 and the second bypass pipeline 6 to the second discharge pipeline 4, which facilitates the transportation of the reaction feed. At the same time, the first bypass pipeline 5 and the second bypass pipeline 6 serve as backups for each other, ensuring that the transportation of the reaction feed can still be achieved even if the first bypass pipeline 5 or the second bypass pipeline 6 fails.

[0026] Optionally, the first bypass line 5 is located between the second bypass line 6 and the heat exchanger 1, and the flow rate of the second bypass line 6 can be greater than that of the first bypass line 5. That is, operators can choose to transport the reaction feed through the first bypass line 5, the second bypass line 6, or both the first and second bypass lines 5 and 6, according to actual needs. By setting the first bypass line 5 and the second bypass line 6 to different flow rates, it is easier to adapt to different working requirements and improve the flexibility of the heat exchange system of the reaction unit in the coal tar hydrogenation process.

[0027] The regulating assembly may further include a third regulating valve 9. The third regulating valve 9 is installed on the second bypass line 6. That is, the third regulating valve 9 can precisely regulate the flow rate of the reaction feed flowing from the second feed line 3 into the second bypass line 6 to adapt to subsequent process requirements. The third regulating valve 9 can be a manual valve, a pneumatic valve, an electric valve, a solenoid valve, etc., and this utility model does not specifically limit it in this regard.

[0028] Reference Figure 1 In some embodiments, the heat exchange system of the reaction unit in the coal tar hydrogenation process further includes a regulating pipeline 10 and a thermometer 11. One end of the regulating pipeline 10 is connected to the first bypass pipeline 5, and the other end of the regulating pipeline 10 is connected to the second discharge pipeline 4. The thermometer 11 is installed on the regulating pipeline 10, the first bypass pipeline 5, the second bypass pipeline 6, or the second discharge pipeline 4. That is, the temperature of the reaction feed in the regulating pipeline 10, the first bypass pipeline 5, or the second bypass pipeline 6 is measured by the thermometer 11, so that the operator can obtain the temperature of the reaction feed and adjust the amount of fuel required to heat the reaction feed in subsequent processes according to the temperature of the reaction feed. In this embodiment, the thermometer 11 is a TI21303.

[0029] The heat exchange system of the reaction unit in the coal tar hydrogenation process may further include a pressure gauge 12, which is installed on the regulating pipeline 10, the first bypass pipeline 5, the second bypass pipeline 6, or the second discharge pipeline 4. That is, the pressure gauge 12 measures the pressure value in the regulating pipeline 10, the first bypass pipeline 5, or the second bypass pipeline 6, facilitating operator monitoring of the pressure value in these pipelines to ensure that the pressure value remains within a safe range. In this embodiment, the pressure gauge 12 is model PG21303.

[0030] The heat exchange system of the reaction unit in the coal tar hydrogenation process may also include: a temperature indicator controller 13, which is installed on the regulating pipeline 10, the first bypass pipeline 5, the second bypass pipeline 6, or the second discharge pipeline 4, and the temperature indicator controller 13 is electrically connected to the first regulating valve 7, the second regulating valve 8, the third regulating valve 9, the thermometer 11, and the pressure gauge 12. Specifically, the temperature indicator controller 13 is equipped with temperature and pressure thresholds. It acquires real-time temperature and pressure values, compares these values ​​with the thresholds, and adjusts the first regulating valve 7, the second regulating valve 8, or the third regulating valve 9 based on the deviation between the real-time temperature and pressure values ​​and the thresholds. This adjusts the flow rate of the reaction feed in the second feed line 3, the first bypass line 5, or the second bypass line 6, thereby regulating the temperature of the reaction feed and the pressure of the pipeline to the set range. This configuration facilitates automatic adjustment of the reaction feed temperature and pipeline pressure, improving the efficiency of the heat exchange system in the coal tar hydrogenation process. The temperature indicator controller 13 is a commercially available product, well-known to those skilled in the art, and will not be described in detail here. In this embodiment, the model of the temperature indicator controller 13 is TIC21304.

[0031] The working principle of the heat exchange system of the reaction unit in the coal tar hydrogenation process of this utility model is as follows: when the temperature of the reaction product is higher than the temperature of the reaction feed, the first regulating valve 7 is opened, and the second regulating valve 8 and the third regulating valve 9 are closed at the same time, so that the reaction feed enters the tube side from the second feed pipeline 3. The heat of the reaction product in the shell side is transferred to the reaction feed to achieve the preheating of the reaction feed. The heated reaction feed is transported to the subsequent process from the second discharge pipeline 4, and the cooled reaction product is discharged from the first discharge pipe.

[0032] When the temperature of the reaction product is lower than the temperature of the reaction feed, the first regulating valve 7 is closed, while the second regulating valve 8 and the third regulating valve 9 are opened. The reaction feed enters the first bypass line 5 and the second bypass line 6 from the second feed line 3. Subsequently, the reaction feed enters the second discharge line 4 from the first bypass line 5 and the second bypass line 6, and is then transported to the subsequent process by the second discharge line 4. This avoids the reaction feed being "reversely absorbed" in the heat exchanger 1, thus avoiding the need for more energy consumption to heat it later. This achieves energy saving and consumption reduction in the heat exchange system of the reaction unit in the coal tar hydrogenation process. At this time, the reaction product enters the shell side of the heat exchanger 1 along the first feed line 2, and is then discharged from the first discharge pipe at the outlet end of the shell side.

[0033] The preferred embodiments of this utility model are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A heat exchange system for a reaction unit in a coal tar hydrogenation process, characterized in that, include: The heat exchanger (1) has a tube side and a shell side; The first feed line (2) is connected to the inlet end of the shell side; The outlet end of the second feed line (3) is connected to the inlet end of the tube; The second discharge pipeline (4) is connected to the outlet end of the pipeline. The first bypass pipeline (5) has its inlet end connected to the second feed pipeline (3) and its outlet end connected to the second discharge pipeline (4). And an adjustment component, installed on the second feed line (3), the adjustment component being used to adjust the connection state between the heat exchanger (1) and the first bypass line (5) and the second feed line (3).

2. The heat exchange system of the reaction unit in the coal tar hydrogenation process according to claim 1, characterized in that, The heat exchange system of the reaction unit in the coal tar hydrogenation process also includes: The second bypass pipeline (6) has its inlet end connected to the second feed pipeline (3) and its outlet end connected to the second discharge pipeline (4).

3. The heat exchange system of the reaction unit in the coal tar hydrogenation process according to claim 2, characterized in that: The first bypass line (5) is located between the second bypass line (6) and the heat exchanger (1).

4. The heat exchange system of the reaction unit in the coal tar hydrogenation process according to claim 2, characterized in that: The flow rate of the second bypass line (6) is greater than the flow rate of the first bypass line (5).

5. The heat exchange system of the reaction unit in the coal tar hydrogenation process according to any one of claims 2 to 4, characterized in that, The regulating assembly includes a first regulating valve (7): The first regulating valve (7) is installed on the second feed line (3), and the first regulating valve (7) is located between the heat exchanger (1) and the first bypass line (5).

6. The heat exchange system of the reaction unit in the coal tar hydrogenation process according to claim 5, characterized in that, The adjustment component further includes: The second regulating valve (8) is installed on the first bypass line (5).

7. The heat exchange system of the reaction unit in the coal tar hydrogenation process according to claim 6, characterized in that, The adjustment component further includes: The third regulating valve (9) is installed on the second bypass line (6).

8. The heat exchange system of the reaction unit in the coal tar hydrogenation process according to claim 6, characterized in that, The heat exchange system of the reaction unit in the coal tar hydrogenation process also includes: The regulating pipeline (10) is connected at one end to the first bypass pipeline (5) and at the other end to the second discharge pipeline (4). The thermometer (11) is installed on the regulating line (10) or the first bypass line (5) or the second bypass line (6) or the second discharge line (4).

9. The heat exchange system of the reaction unit in the coal tar hydrogenation process according to claim 8, characterized in that, The heat exchange system of the reaction unit in the coal tar hydrogenation process also includes: Pressure gauge (12), which is installed on the regulating line (10) or the first bypass line (5) or the second bypass line (6) or the second discharge line (4).

10. The heat exchange system of the reaction unit in the coal tar hydrogenation process according to claim 9, characterized in that, The heat exchange system of the reaction unit in the coal tar hydrogenation process also includes: Temperature indicator controller (13) is installed on the regulating line (10) or the first bypass line (5) or the second bypass line (6) or the second discharge line (4), and the temperature indicator controller (13) is electrically connected to the second regulating valve (8), the thermometer (11) and the pressure gauge (12).

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