Online sampling device of hydrogenation reaction kettle

Abstract

The utility model belongs to the technical field of hydrogenation reaction kettles, and particularly relates to a hydrogenation reaction kettle on-line sampling device which comprises a sampling pipeline, a first valve and a second valve are installed on the sampling pipeline, a pressure relief container is installed at one end of the sampling pipeline so as to release pressure, and a second connecting pipeline is connected to the pressure relief container. The first connecting pipeline is provided with a first valve, the second connecting pipeline is provided with a sixth valve, the pressure relief container is connected with a nitrogen replacement mechanism and a flushing mechanism, the first valve and the second valve are PN160 high-pressure needle type hand valves, the pressure relief container is a flange sight glass, the sampling pipeline is connected with the flange sight glass, one end of the sampling pipeline extends into the flange sight glass, and the sixth valve is a needle type hand valve. The nitrogen replacement mechanism comprises a pipeline unit which is fixedly connected to the flange sight glass and communicates with the flange sight glass. According to the utility model, the phenomena of leakage, flash explosion and spontaneous combustion of a residual catalyst during sampling of the hydrogenation reaction kettle can be effectively reduced, and the safety and occupational health risks are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrogenation reaction kettles, and specifically relates to an online sampling device for a hydrogenation reaction kettle. Background Art

[0002] At present, the commonly used sampling device is composed of two hand valves and a pipeline; when sampling, the first hand valve is opened first, and the material is pressed into the sampling tube by the hydrogenation reactor, the first hand valve is closed, and the second hand valve is opened, and the material enters the sampling bottle.

[0003] However, due to the high pressure in the hydrogenation reactor, there may be a risk of leakage due to misoperation, and the sampling pipeline is not replaced with nitrogen before sampling, so there is a risk of hydrogen flash explosion; during the sampling process, catalysts (such as palladium carbon, Raney nickel, etc.) will enter the sampling pipeline. If not handled in time, there may be a risk of spontaneous combustion. Utility Model Content

[0004] The purpose of this utility model is to provide an online sampling device for a hydrogenation reactor, which can effectively reduce leakage, flash explosion and spontaneous combustion of residual catalyst during sampling of a hydrogenation reactor, and reduce safety and occupational health risks.

[0005] The technical solutions adopted in this utility are as follows:

[0006] An online sampling device for a hydrogenation reactor comprises a sampling pipeline, a first valve and a second valve are installed on the sampling pipeline, a pressure relief container is installed at one end of the sampling pipeline to release the pressure, a second connecting pipeline is connected to the pressure relief container, a sixth valve is installed on the second connecting pipeline, and the pressure relief container is connected to a nitrogen replacement mechanism and a flushing mechanism.

[0007] Furthermore, the first valve and the second valve are both PN160 high-pressure needle-type manual valves.

[0008] Furthermore, the pressure relief container is a flange sight glass, the sampling pipe is connected to the flange sight glass, and one end of the sampling pipe extends to the inside of the flange sight glass.

[0009] Furthermore, the sixth valve is a needle-type manual valve.

[0010] Furthermore, the nitrogen replacement mechanism includes a pipeline unit fixedly connected to the flange sight glass and communicated with the flange sight glass, and the pipeline unit is connected to a third valve and a fifth valve.

[0011] Furthermore, the flushing mechanism includes a pipeline unit fixedly connected to the flange sight glass and communicated with the flange sight glass, and a fourth valve is connected to the pipeline unit.

[0012] Further, the nitrogen replacement mechanism includes a pipeline unit fixedly connected to the flange sight glass and communicated with the flange sight glass, and the pipeline unit is connected to a third valve and a fifth valve;

[0013] The flushing mechanism comprises a pipeline unit fixedly connected to the flange sight glass and communicated with the flange sight glass, and the pipeline unit is connected to a fourth valve;

[0014] The pipeline unit of the nitrogen replacement mechanism and the pipeline unit of the flushing mechanism are the same first connecting pipeline, one end of the first connecting pipeline is fixedly connected to the flange sight glass, and the third valve, the fourth valve and the fifth valve are all connected to the first connecting pipeline.

[0015] Furthermore, the third valve, the fourth valve and the fifth valve are all manual ball valves.

[0016] Furthermore, the third valve, the fourth valve and the fifth valve are all connected to the first connecting pipe through a check valve.

[0017] The technical effects achieved by this utility model are:

[0018] The practical online sampling device for a hydrogenation reactor can effectively reduce leakage, flash explosion and self-ignition of residual catalyst during sampling of the hydrogenation reactor, thereby reducing safety and occupational health risks by adding a pressure relief container, a nitrogen replacement mechanism and a flushing mechanism on the basis of a first valve and a second valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of this utility model.

[0020] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0021] 1. Hydrogenation reactor; 2. Flange sight glass; 3. Sampling bottle; 4. Sampling pipeline; 5. First connecting pipeline; 6. Second connecting pipeline; 7. First valve; 8. Second valve; 9. Third valve; 10. Fourth valve; 11. Fifth valve; 12. Check valve; 13. Sixth valve. DETAILED DESCRIPTION

[0022] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with the embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the present invention, and does not strictly limit the scope of protection specifically requested by the present invention.

[0023] like Figure 1As shown, an online sampling device for a hydrogenation reactor comprises a sampling pipeline 4, on which a first valve 7 and a second valve 8 are installed. After the first valve 7 and the second valve 8 are opened, the material inside the hydrogenation reactor 1 flows through the sampling pipeline 4;

[0024] Here, the first valve 7 and the second valve 8 are preferably PN160 high-pressure needle-type hand valves, which can withstand greater pressure and have better sealing performance. When the first valve 7 is opened, the material inside the hydrogenation reactor 1 enters the sampling pipeline 4 located between the first valve 7 and the second valve 8, and then the first valve 7 is closed. After the first valve 7 is closed, the second valve 8 is opened to allow the material to flow out. At this time, the pressure level before the second valve 8 is PN160, and the pressure level of the pipeline system after the second valve 8 is PN16.

[0025] The sampling pipe 4 is connected to the hydrogenation reactor 1, and a pressure relief container is installed at one end of the sampling pipe 4 away from the hydrogenation reactor 1. The pressure relief container is preferably a flange sight glass 2. The sampling pipe 4 is connected to the flange of the flange sight glass 2, and the end of the sampling pipe 4 away from the hydrogenation reactor 1 extends to the inside of the flange sight glass 2, thereby completing the release of pressure. A second connecting pipe 6 is connected to the pressure relief container, and a sixth valve 13 is installed on the second connecting pipe 6. The sixth valve 13 is preferably a needle-type hand valve, which has good sealing performance.

[0026] After the second connecting pipe 6 is connected to the sampling bottle 3, the sixth valve 13 is opened after the pressure relief is completed, so that the material inside the flange sight glass 2 after pressure relief can enter the interior of the sampling bottle 3. During sampling, the sixth valve 13 is used to isolate and relieve the pressure of the container to avoid overpressure in the sampling device and leakage due to overpressure.

[0027] Among them, the pressure relief container is connected to a nitrogen replacement mechanism and a flushing mechanism. The nitrogen replacement mechanism can replace the nitrogen inside the pressure relief container and the sampling pipe 4 before sampling, thereby reducing the flash explosion caused by excessive oxygen content. The flushing mechanism can use backwash liquid to flush the sampling device and the pipeline after sampling, thereby reducing the spontaneous combustion of residual catalyst.

[0028] Among them, the nitrogen replacement mechanism includes a pipeline unit fixedly connected to the flange sight glass 2 and connected to the flange sight glass 2, and the pipeline unit is connected to the third valve 9 and the fifth valve 11. When nitrogen replacement is performed before sampling, the third valve 9 and the fifth valve 11 are opened. After the third valve 9 is started, nitrogen will be flushed into the flange sight glass 2 and the sampling pipeline 4 through the first connecting pipeline 5 to perform nitrogen replacement. After 1 minute, the third valve 9 is closed and the fifth valve 11 is in a normally open state, so that the nitrogen replacement can be completed using a relatively simple structure.

[0029] Among them, the flushing mechanism includes a pipeline unit fixedly connected to the flange sight glass 2 and connected to the flange sight glass 2, and the pipeline unit is connected to the fourth valve 10. When the sampling is completed, the first valve 7, the second valve 8 and the fifth valve 11 are opened to flush the catalyst remaining in the pipeline into the hydrogenation reactor. After the flushing is completed, the fourth valve 10 is closed, and the third valve 9 is opened to press the residual liquid in the flange sight glass 2 and the sampling pipeline 4 back into the hydrogenation reactor 1 to ensure that there is no material in the sampling device.

[0030] Here, the pipeline unit of the nitrogen replacement mechanism and the pipeline unit of the flushing mechanism are the same first connecting pipeline 5, one end of the first connecting pipeline 5 is fixedly connected to the flange sight glass 2, and the third valve 9, the fourth valve 10 and the fifth valve 11 are all connected to the first connecting pipeline 5, thereby simplifying the structure and enabling a more thorough flushing to be completed when the fourth valve 10 is flushed.

[0031] The third valve 9, the fourth valve 10 and the fifth valve 11 are all manual ball valves, which are convenient to use and have a simple structure, thereby reducing production costs.

[0032] At the same time, in order to reduce the backflow phenomenon, the third valve 9, the fourth valve 10 and the fifth valve 11 are all connected to the first connecting pipe 5 through the check valve 12. The check valve 12 can prevent the material inside the first connecting pipe 5 from entering the fourth valve 10 and the fifth valve 11, and prevent external gas from entering the first connecting pipe 5 through the fifth valve 11.

[0033] The working principle of the utility model is as follows: when nitrogen replacement is performed before sampling, the third valve 9 and the fifth valve 11 are opened. After the third valve 9 is started, nitrogen will be flushed into the flange sight glass 2 and the sampling pipe 4 through the first connecting pipe 5 to perform nitrogen replacement. After 1 minute, the third valve 9 is closed, and the fifth valve 11 is in a normally open state to complete the nitrogen replacement. After the nitrogen replacement is completed, the sampling operation is performed;

[0034] During sampling, after the first valve 7 is opened, the material inside the hydrogenation reactor 1 enters the sampling pipeline 4 between the first valve 7 and the second valve 8, and then the first valve 7 is closed. After the first valve 7 is closed, the second valve 8 is opened to allow the material to flow into the flange sight glass 2 to complete the pressure release. After the pressure relief is completed, the sixth valve 13 is opened to allow the pressure-relieved material inside the flange sight glass 2 to enter the sampling bottle 3 to complete the sampling;

[0035] After sampling, the first valve 7, the second valve 8 and the fifth valve 11 are opened to flush the catalyst remaining in the pipeline into the hydrogenation reactor. After flushing, the fourth valve 10 is closed and the third valve 9 is opened to press the residual liquid in the flange sight glass 2 and the sampling pipeline 4 back into the hydrogenation reactor 1 to ensure that there is no material in the sampling device.

[0036] In summary, the present technical solution can effectively reduce the leakage, flash explosion and spontaneous combustion of residual catalyst during sampling of the hydrogenation reactor, thereby reducing safety and occupational health risks by adding a pressure relief container, a nitrogen replacement mechanism and a flushing mechanism on the basis of the first valve 7 and the second valve 8.

[0037] The above is only a preferred embodiment of the present invention. It should be noted that, for ordinary technicians in the field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. An online sampling device for a hydrogenation reactor, comprising a sampling pipeline (4), wherein a first valve (7) and a second valve (8) are installed on the sampling pipeline (4), characterized in that: A pressure relief container is installed at one end of the sampling pipe (4) to release the pressure. The pressure relief container is connected to a second connecting pipe (6), and a sixth valve (13) is installed on the second connecting pipe (6). The pressure relief container is connected to a nitrogen replacement mechanism and a flushing mechanism.

2. The online sampling device for a hydrogenation reactor according to claim 1, characterized in that: The first valve (7) and the second valve (8) are both PN160 high-pressure needle-type hand valves.

3. The online sampling device for a hydrogenation reactor according to claim 1, characterized in that: The pressure relief container is a flange sight glass (2), the sampling pipe (4) is connected to the flange sight glass (2), and one end of the sampling pipe (4) extends to the interior of the flange sight glass (2).

4. The online sampling device for a hydrogenation reactor according to claim 1, characterized in that: The sixth valve (13) is a needle-type hand valve.

5. The online sampling device for a hydrogenation reactor according to claim 3, characterized in that: The nitrogen replacement mechanism comprises a pipeline unit fixedly connected to the flange sight glass (2) and communicated with the flange sight glass (2), and the pipeline unit is connected to a third valve (9) and a fifth valve (11).

6. The online sampling device for a hydrogenation reactor according to claim 3, characterized in that: The flushing mechanism comprises a pipeline unit fixedly connected to the flange sight glass (2) and communicated with the flange sight glass (2), and a fourth valve (10) is connected to the pipeline unit.

7. The online sampling device for a hydrogenation reactor according to claim 3, characterized in that: The nitrogen replacement mechanism comprises a pipeline unit fixedly connected to the flange sight glass (2) and communicated with the flange sight glass (2), and the pipeline unit is connected to a third valve (9) and a fifth valve (11); The flushing mechanism comprises a pipeline unit fixedly connected to the flange sight glass (2) and communicated with the flange sight glass (2), and a fourth valve (10) is connected to the pipeline unit; The pipeline unit of the nitrogen replacement mechanism and the pipeline unit of the flushing mechanism are the same first connecting pipeline (5), one end of the first connecting pipeline (5) is fixedly connected to the flange sight glass (2), and the third valve (9), the fourth valve (10) and the fifth valve (11) are all connected to the first connecting pipeline (5).

8. The online sampling device for a hydrogenation reactor according to claim 7, characterized in that: The third valve (9), the fourth valve (10) and the fifth valve (11) are all manual ball valves.

9. The online sampling device for a hydrogenation reactor according to claim 7, characterized in that: The third valve (9), the fourth valve (10) and the fifth valve (11) are all connected to the first connecting pipe (5) via the check valve (12).

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