Hydrogenation tower catalyst adding system

Abstract

The utility model provides a catalyst adding system of a hydrogenation tower, relates to the technical field of chemical production, and solves the problems of certain danger, high nitrogen consumption and high possibility of errors in the existing catalyst adding process. The device comprises a hydrogenation tower, a catalyst adding tank and a working solution supply pump, a discharge port is communicated with the hydrogenation tower through a discharge pipe, an outlet of the working solution supply pump is connected with a working solution outlet pipe, the working solution outlet pipe is divided into a first branch pipe and a second branch pipe, the first branch pipe is communicated with the discharge port at the bottom of the catalyst adding tank, and the second branch pipe is communicated with the discharge port at the bottom of the catalyst adding tank. The second branch pipe is communicated to the hydrogenation tower, the working solution circulating port is communicated to the second branch pipe through a working solution circulating pipe, the emptying port is communicated with an emptying pipe, and the emptying pipe is respectively connected with nitrogen charging equipment and a working solution intermediate tank through a nitrogen charging pipe and an intermediate tank connecting pipe. The device has the beneficial effects that the operation efficiency and the safety coefficient are improved, the nitrogen consumption is reduced, and the purposes of saving energy and reducing consumption are achieved.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically to a catalyst addition system for a hydrogenation tower. Background Technology

[0002] Currently, when adding catalyst to the hydrogenation tower, the catalyst addition tank is filled with hydrogenated liquid, and the feed is introduced from the side wall through ports N2 and N3, and discharged into the hydrogenation tower through port N4. This method of catalyst addition has the following disadvantages:

[0003] 1. The catalyst addition tank is filled with hydrogenated liquid, which poses a certain degree of danger;

[0004] 2. It requires multiple purgings with nitrogen, resulting in a large consumption of nitrogen.

[0005] 3. The operation process is cumbersome and prone to errors. Utility Model Content

[0006] The purpose of this invention is to solve the problems of existing catalyst addition methods, which use hydrogenated liquid as the filling liquid, which is dangerous, consumes a large amount of nitrogen, and involves many operations that are prone to errors. The invention provides a catalyst addition system for hydrogenation towers, which can improve overall operating efficiency and safety, save nitrogen consumption, and achieve the goal of energy saving and consumption reduction.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A catalyst addition system for a hydrogenation tower, characterized in that it includes a hydrogenation tower, a catalyst addition tank, and a working fluid supply pump. The catalyst addition tank has a discharge port at its bottom and a catalyst addition port, a working fluid circulation port, and a vent port at its top. The discharge port is connected to the hydrogenation tower via a discharge pipe. The outlet of the working fluid supply pump is connected to a working fluid outlet pipe, which is divided into a first branch pipe and a second branch pipe. The first branch pipe is connected to the discharge port at the bottom of the catalyst addition tank, and the second branch pipe is connected to the hydrogenation tower. The working fluid circulation port is connected to the second branch pipe via a working fluid circulation pipe. A catalyst addition pipe is connected to the catalyst addition port, and a vent pipe is connected to the vent port. The vent pipe is connected to a nitrogen purging device and a working fluid intermediate tank via a nitrogen purging pipe and an intermediate tank connecting pipe, respectively.

[0009] A further improvement is that the discharge pipe is sequentially connected to a first discharge pipe valve, a discharge pipe sight glass, and a second discharge pipe valve.

[0010] A further improvement is that the catalyst addition tube is equipped with at least two catalyst addition tube valves.

[0011] A further improvement is made to the first branch pipe, which is connected in sequence to the first branch pipe valve A, the first branch pipe check valve, and the first branch pipe valve B.

[0012] A further improvement is that the second branch pipe is connected to a working fluid cooler and a working fluid heater, which are connected in parallel.

[0013] A further improvement is that the working fluid circulation pipe is sequentially connected to a first working fluid circulation pipe valve, a working fluid circulation pipe sight glass, and a second working fluid circulation pipe valve, and the working fluid circulation pipe is connected to the second branch pipe between the working fluid cooler and the working fluid heater and the hydrogenation tower.

[0014] A further improvement is that a second branch valve A is connected to the second branch pipe between the working fluid cooler and the working fluid heater and the working fluid outlet pipe, a second branch valve B is connected to the second branch pipe between the working fluid cooler and the working fluid heater and the working fluid circulation pipe, and a second branch check valve and a second branch valve C are connected in sequence between the working fluid circulation pipe and the hydrogenation tower.

[0015] A further improvement is that a venting valve is connected to the venting pipe.

[0016] A further improvement is made in that: an intermediate tank connecting pipe valve is connected to the intermediate tank connecting pipe, an intermediate tank connecting pipe sight glass is connected to the intermediate tank connecting pipe between the intermediate tank connecting pipe valve and the vent pipe, a gas sampling pipe is connected to the intermediate tank connecting pipe between the intermediate tank connecting pipe sight glass and the intermediate tank connecting pipe valve, and a gas sampling pipe valve is connected to the gas sampling pipe.

[0017] A further improvement is that a nitrogen filling pipe valve is connected to the nitrogen filling pipe, and a nitrogen filling pipe check valve is connected to the nitrogen filling pipe between the nitrogen filling pipe valve and the vent pipe.

[0018] Compared with existing technologies, the above technical solution has the following advantages:

[0019] The catalyst addition tank filling liquid has been changed from hydrogenated liquid to working fluid circulation, which improves the safety factor. The feeding method during catalyst addition has been changed from intermittent multiple feeding to working fluid circulation feeding, which improves the operation efficiency. The difficulty and number of nitrogen replacements have been reduced, saving nitrogen consumption and achieving the goal of energy saving and consumption reduction. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the system structure of this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Hydrogenation tower; 2. Catalyst addition tank; 3. Intermediate working fluid tank; 4. Nitrogen purging equipment; 5. Working fluid supply pump; 6. Working fluid cooler; 7. Working fluid heater; 8. Discharge pipe; 9. First discharge pipe valve; 10. Discharge pipe sight glass; 11. Second discharge pipe valve; 12. Catalyst addition pipe; 13. Catalyst addition pipe valve; 14. Working fluid circulation pipe; 15. First working fluid circulation pipe valve; 16. Working fluid circulation pipe sight glass; 17. Second working fluid circulation pipe valve; 18. Vent pipe; 19. 4. Vent pipe valve 241, intermediate tank connecting pipe 31, intermediate tank connecting pipe valve 32, intermediate tank connecting pipe sight glass 33, gas sampling pipe 34, nitrogen filling pipe 41, nitrogen filling pipe valve 42, nitrogen filling pipe check valve 43, working fluid outlet pipe 51, first branch pipe 52, first branch pipe valve A 521, first branch pipe check valve 522, first branch pipe valve B 523, second branch pipe 53, second branch pipe valve A 531, second branch pipe valve B 532, second branch pipe check valve 533, second branch pipe valve C 534. Detailed Implementation

[0023] See Figure 1 As shown, the technical solution adopted in this specific embodiment is: a hydrogenation tower catalyst addition system, including a hydrogenation tower 1, a catalyst addition tank 2, and a working liquid supply pump 5. The catalyst addition tank 2 is provided with a discharge port at the bottom and a catalyst addition port, a working liquid circulation port, and a vent port at the top. The discharge port is connected to the hydrogenation tower 1 through a discharge pipe 21. The outlet of the working liquid supply pump 5 is connected to a working liquid outlet pipe 51. The working liquid outlet pipe 51 is divided into a first branch pipe 52 and a second branch pipe 53. The first branch pipe 52 is connected to the discharge port at the bottom of the catalyst addition tank 2, and the second branch pipe 53 is connected to the hydrogenation tower 1. The working liquid circulation port is connected to the second branch pipe 53 through a working liquid circulation pipe 23. The catalyst addition port is connected to a catalyst addition pipe 22, and the vent port is connected to a vent pipe 24. The vent pipe 24 is connected to a nitrogen filling device 4 and a working liquid intermediate tank 3 through a nitrogen filling pipe 41 and an intermediate tank connecting pipe 31, respectively.

[0024] The discharge pipe 21 is sequentially connected to a first discharge pipe valve 211, a discharge pipe sight glass 212, and a second discharge pipe valve 213.

[0025] The catalyst addition pipe 22 is provided with at least two catalyst addition pipe valves 221.

[0026] Among them, the first branch pipe 52 is connected in sequence to the first branch pipe valve A521, the first branch pipe check valve 522, and the first branch pipe valve B523.

[0027] The second branch pipe 53 is connected to a working fluid cooler 6 and a working fluid heater 7, which are connected in parallel.

[0028] The working fluid circulation pipe 23 is sequentially connected to a first working fluid circulation pipe valve 231, a working fluid circulation pipe sight glass 232, and a second working fluid circulation pipe valve 233. The working fluid circulation pipe 23 is connected to the second branch pipe 53 between the working fluid cooler 6 and the working fluid heater 7 and the hydrogenation tower 1.

[0029] Specifically, a second branch valve A531 is connected to the second branch pipe 53 between the working fluid cooler 6 and the working fluid heater 7 and the working fluid outlet pipe 51; a second branch valve B532 is connected to the second branch pipe 53 between the working fluid cooler 6 and the working fluid heater 7 and the working fluid circulation pipe 23; and a second branch check valve 533 and a second branch valve C534 are sequentially connected between the working fluid circulation pipe 23 and the hydrogenation tower 1.

[0030] The vent pipe 24 is connected to a vent pipe valve 241.

[0031] The intermediate groove connecting pipe 31 is connected to an intermediate groove connecting pipe valve 32. An intermediate groove connecting pipe sight glass 33 is connected to the intermediate groove connecting pipe 31 between the intermediate groove connecting pipe valve 32 and the vent pipe 24. A gas sampling pipe 34 is connected to the intermediate groove connecting pipe 31 between the intermediate groove connecting pipe sight glass 33 and the intermediate groove connecting pipe valve 32. A gas sampling pipe valve is connected to the gas sampling pipe 34.

[0032] The nitrogen filling pipe 41 is connected to a nitrogen filling pipe valve 42, and the nitrogen filling pipe 41 between the nitrogen filling pipe valve 42 and the vent pipe 24 is connected to a nitrogen filling pipe check valve 43.

[0033] The working principle of this utility model:

[0034] 1. Replace the catalyst with nitrogen using a nitrogen purging device until the oxygen content is ≤0.5%.

[0035] 2. Open the nitrogen charging valve and pressurize the catalyst addition tank to 0.5 MPa using the nitrogen charging equipment and maintain it. Drain the residual working fluid from the discharge port (N4 port) at the bottom of the catalyst addition tank to the hydrogenation tower.

[0036] 3. Open the catalyst addition valve on the catalyst addition port (N5) of the catalyst addition tank, add the catalyst, and after the addition is complete, close the catalyst addition valve and use a nitrogen purging device to replace the oxygen content with nitrogen to ensure it meets the required level.

[0037] 4. The working fluid is introduced into the vent (N4 port) at the bottom of the catalyst addition tank through the working fluid supply pump, and then vented into the intermediate working fluid tank through the vent pipe. When the working fluid appears in the sight glass of the intermediate tank connecting pipe, the vent pipe valve and the first branch pipe valve are closed.

[0038] 5. Open the working fluid circulation valve on the working fluid circulation pipe at the top of the catalyst addition tank (N6 port) and the first branch valve on the first branch pipe connected to the bottom discharge port (N4 port) of the catalyst addition tank. Circulate the catalyst through the catalyst addition tank for 1 hour, and then close the working fluid circulation valve and the first branch valve (the catalyst is carried into the hydrogenation tower through the working fluid circulation).

[0039] 6. Slightly open the discharge pipe valve of the discharge pipe connected to the bottom discharge port (N4 port) of the catalyst addition tank, pressurize the nitrogen in the catalyst addition tank to 0.5 MPa using a nitrogen purging device and maintain it. Pour the working fluid in the catalyst addition tank to the hydrogenation tower. When there is no working fluid in the sight glass of the discharge pipe, close the discharge pipe valve and maintain the pressure at 0.4 MPa for standby.

[0040] Note:

[0041] 1. Catalyst flow direction: The catalyst is added from the catalyst addition port (N5), and follows the working liquid out from the working liquid circulation port (N6). It enters the second branch pipe between the working liquid cooler and the working liquid heater and the hydrogenation tower through the working liquid circulation pipe, and then enters the hydrogenation tower through the second branch pipe.

[0042] 2. When adding nitrogen to the catalyst addition tank, the operator needs to adjust the amount of nitrogen added in a timely manner according to the pressure gauge on site, and maintain the pressure at 0.4-0.5 MPa.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions provided are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents. Any aspects of this utility model not detailed herein are well-known to those skilled in the art.

Claims

1. A catalyst addition system for a hydrogenation tower, characterized in that: The system includes a hydrogenation tower, a catalyst addition tank, and a working fluid supply pump. The catalyst addition tank has a discharge port at its bottom and a catalyst addition port, a working fluid circulation port, and a vent port at its top. The discharge port is connected to the hydrogenation tower via a discharge pipe. The outlet of the working fluid supply pump is connected to a working fluid outlet pipe, which is divided into a first branch pipe and a second branch pipe. The first branch pipe is connected to the discharge port at the bottom of the catalyst addition tank, and the second branch pipe is connected to the hydrogenation tower. The working fluid circulation port is connected to the second branch pipe via a working fluid circulation pipe. The catalyst addition port is connected to a catalyst addition pipe, and the vent port is connected to a vent pipe. The vent pipe is connected to a nitrogen purging device and a working fluid intermediate tank via a nitrogen purging pipe and an intermediate tank connecting pipe, respectively.

2. The hydrogenation tower catalyst addition system according to claim 1, characterized in that: The discharge pipe is sequentially connected to a first discharge pipe valve, a discharge pipe sight glass, and a second discharge pipe valve.

3. The catalyst addition system for the hydrogenation tower according to claim 1, characterized in that: The catalyst addition tube is equipped with at least two catalyst addition tube valves.

4. The hydrogenation tower catalyst addition system according to claim 1, characterized in that: The first branch pipe is connected in sequence to the first branch pipe valve A, the first branch pipe check valve, and the first branch pipe valve B.

5. The catalyst addition system for the hydrogenation tower according to claim 1, characterized in that: The second branch pipe is connected to a working fluid cooler and a working fluid heater, which are connected in parallel.

6. The hydrogenation tower catalyst addition system according to claim 5, characterized in that: The working fluid circulation pipe is sequentially connected to a first working fluid circulation pipe valve, a working fluid circulation pipe sight glass, and a second working fluid circulation pipe valve. The working fluid circulation pipe is connected to the second branch pipe between the working fluid cooler and the working fluid heater and the hydrogenation tower.

7. The hydrogenation tower catalyst addition system according to claim 6, characterized in that: A second branch valve A is connected to the second branch pipe between the working fluid cooler and the working fluid heater and the working fluid outlet pipe. A second branch valve B is connected to the second branch pipe between the working fluid cooler and the working fluid heater and the working fluid circulation pipe. A second branch check valve and a second branch valve C are connected in sequence between the working fluid circulation pipe and the hydrogenation tower.

8. The hydrogenation tower catalyst addition system according to claim 1, characterized in that: A venting valve is connected to the venting pipe.

9. The catalyst addition system for the hydrogenation tower according to claim 1, characterized in that: An intermediate tank connecting pipe valve is connected to the intermediate tank connecting pipe. An intermediate tank connecting pipe sight glass is connected to the intermediate tank connecting pipe between the intermediate tank connecting pipe valve and the vent pipe. A gas sampling pipe is connected to the intermediate tank connecting pipe between the intermediate tank connecting pipe sight glass and the intermediate tank connecting pipe valve. A gas sampling pipe valve is connected to the gas sampling pipe.

10. The hydrogenation tower catalyst addition system according to claim 1, characterized in that: A nitrogen filling pipe valve is connected to the nitrogen filling pipe, and a nitrogen filling pipe check valve is connected to the nitrogen filling pipe between the nitrogen filling pipe valve and the venting pipe.

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