Closed sampler for sampling catalyst

Abstract

The utility model discloses a closed sampler for catalyst sampling, which belongs to the technical field of catalyst sampling and comprises a first pipe group, a sampling tank and a second pipe group. The first pipe set comprises a first pipeline, a second pipeline, a third pipeline and a fourth pipeline. The first pipeline is connected with the catalyst pipeline and is provided with a first valve and a second valve; and the second pipeline, the third pipeline and the fourth pipeline are connected with the first pipeline and are respectively provided with a third valve, a fourth valve and a fifth valve. The sampling tank is connected with a fourth pipeline, is connected with a pressure gauge through a fifth pipeline, is connected with a filter through a sixth pipeline, and is respectively provided with a sixth valve and a seventh valve. And the second pipe group comprises a seventh pipeline and an eighth pipeline. And the seventh pipeline is connected with the sampling tank and is provided with an eighth valve. And the eighth pipeline is connected with the seventh pipeline and is provided with a ninth valve and a one-way valve. According to the utility model, the problem that the catalyst is unsmooth to convey and discharge when the existing closed sampler is used for sampling is solved.

Description

Technical Field

[0001] This utility model relates to the field of catalyst sampling technology, and in particular to a sealed sampler for catalyst sampling. Background Technology

[0002] Catalytic cracking refers to the process of converting heavy oil into cracked gas, gasoline, and diesel fuel through a cracking reaction under the action of a thermal catalyst. The catalyst used in catalytic cracking is a solid weak acid catalyst, mainly composed of molecular sieves, a matrix, and a binder. Its main components are alumina, silicon dioxide, and modifying elements such as rare earth elements and phosphorus. During contact with feedstock molecules, the catalyst provides strong acid centers to the feedstock molecules. The acidic centers of the catalyst donate protons to unsaturated hydrocarbons or extract negative hydrogen ions from self-saturated hydrocarbons, causing the feedstock molecules to form positive carbocations. These carbocations then undergo a series of complex chemical reactions on the catalyst surface, including cracking, isomerization, hydrogen transfer, and cyclization, ultimately converting the feedstock into the desired products. In a catalytic cracking unit, the use and performance of the catalyst play a crucial role in the unit's operation. Therefore, it is essential to regularly sample and analyze the catalyst.

[0003] In the prior art, Chinese patent application number 201922264936.6 addresses the shortcomings of existing direct-discharge samplers by proposing a closed-loop catalyst sampling device. This sampling device has a simple structure and is easy to operate. During sampling, it can not only reduce catalyst emissions to a certain extent but also recover the catalyst, playing a role in protecting the environment and human health. This closed-loop catalyst sampling device achieves a closed and recyclable catalyst sampling process by adding a sampling tank, valves, and pipelines to the outlet of the original catalyst sampling tank. However, this solution has the following drawbacks:

[0004] (1) The sampling tank inlet pipeline has a 90° bend, and the sampling tank is a closed type without exhaust facilities, which will cause the catalyst to be delivered to the sampling tank unsmoothly during sampling.

[0005] (2) The angle between the central axis of the sampling tank and the horizontal plane is 15-25°, which is less than the catalyst repose angle. The normal catalyst repose angle is about 25°. When sampling from the sampling tank to the sampling cup, the catalyst discharge is not smooth. Utility Model Content

[0006] This invention proposes a sealed sampler for catalyst sampling to solve the problem of poor catalyst delivery and discharge during sampling using existing sealed samplers.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A sealed sampler for catalyst sampling, comprising:

[0009] The first pipe assembly includes a first pipe, a second pipe, a third pipe, and a fourth pipe. One end of the first pipe is connected to a catalyst pipe, and the angle between them is an acute angle. A first valve and a second valve are installed on the first pipe, with the first valve being closer to the catalyst pipe than the second valve. One end of the second pipe is connected to the first pipe and is located between the first valve and the catalyst pipe, and a third valve is installed on the second pipe. One end of the third pipe is connected to the first pipe and is located between the first valve and the second valve, and a fourth valve is installed on the third pipe. One end of the fourth pipe is connected to the first pipe and is located between the third pipe and the second valve, with the angle between the fourth pipe and the first pipe being an acute angle, and a fifth valve is installed on the fourth pipe.

[0010] A sampling tank is vertically installed, with its upper part connected to the end of the fourth pipe away from the first pipe. The sampling tank is connected to a pressure gauge via a fifth pipe, and a sixth valve is installed on the fifth pipe. The sampling tank is connected to a filter via a sixth pipe, and a seventh valve is installed on the sixth pipe.

[0011] The second pipe assembly includes a seventh pipe and an eighth pipe; one end of the seventh pipe is connected to the bottom of the sampling tank, and the other end is equipped with an eighth valve. One end of the eighth pipe is connected to the seventh pipe and is located between the eighth valve and the sampling tank. The other end of the eighth pipe is equipped with a ninth valve. A one-way valve is installed in the middle of the eighth pipe, and the end of the one-way valve near the ninth valve is the air inlet.

[0012] Furthermore, the first, second, third, fourth, fifth, sixth, seventh, and eighth pipelines are all carbon steel pipes or stainless steel pipes; the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth valves are all gate valves.

[0013] Furthermore, both the second and third pipes are arranged perpendicular to the first pipe.

[0014] Furthermore, the angle between the first pipe and the catalyst pipe, as well as the angle between the first pipe and the fourth pipe, are both α, where α is 30°-45°.

[0015] Furthermore, the diameter of the seventh pipe is 30-50 mm.

[0016] Furthermore, the first pipeline is detachably connected to the catalyst pipeline via a flange assembly; the second, third, and fourth pipelines are all detachably connected to the first pipeline via flange assemblies; the fourth, fifth, sixth, and seventh pipelines are all detachably connected to the sampling tank via flange assemblies; the eighth pipeline is detachably connected to the seventh pipeline via a flange assemblies; all flange assemblies are equipped with sealing gaskets and are locked together by several double-ended studs and nuts.

[0017] Furthermore, the volume of the sampling container is 0.5-1.5L.

[0018] Furthermore, the upper part of the sampling container is cylindrical, and the lower part is an inverted cone, with the included angle β of the conical inclined plane being 45°-60°.

[0019] Furthermore, the filter is vertically installed on the top of the sampling tank, and its interior uses a high-temperature resistant sintered metal filter element. The filter has an accuracy of 10-30μm.

[0020] Furthermore, the pressure gauge is a Bourdon tube pressure gauge with a range of 0-1.6 MPa.

[0021] By adopting the above technical solution, this utility model has the following beneficial effects:

[0022] 1. This utility model achieves closed-loop sampling by temporarily storing the catalyst required for sampling in a sampling tank and filtering out catalyst dust emitted during sampling using a filter. Compared to existing technologies, this utility model is simpler and more effective, ensuring smooth catalyst extraction during sampling while reducing catalyst dust emissions, thus protecting the environment and human health. Specifically, the sampling tank of this utility model is connected to the first pipe via a fourth pipe, and the angle between the first and fourth pipes is 30°-45°, avoiding 90° bends and facilitating smooth catalyst transport. Furthermore, a filter is installed at the top of the sampling tank, providing both filtration and exhaust functions, preventing the closed structure from hindering catalyst transport and further improving the smoothness of catalyst delivery.

[0023] 2. All pipes used in this utility model are detachable, which ensures that if the sampler fails, it can be quickly replaced with spare parts without ignition. It has the advantages of simple structure, easy operation, easy maintenance, and quick replacement of vulnerable parts.

[0024] 3. The lower half of the sampling can is made into an inverted cone shape, and the included angle β of the inclined surface of the cone is 45°-60°. This included angle is much larger than the catalyst repose angle. Since the catalyst is fluid, this setting allows the catalyst to flow down easily, avoiding the problem of poor catalyst discharge when the sampling can is taking samples from the sampling cup. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the sealed sampler proposed in this utility model;

[0026] The attached diagram is labeled as follows: 1-Catalyst pipeline, 2-First pipeline, 3-First valve, 4-Second valve, 5-Second pipeline, 6-Third valve, 7-Third pipeline, 8-Fourth valve, 9-Fourth pipeline, 10-Fifth valve, 11-Sampling tank, 12-Fifth pipeline, 13-Pressure gauge, 14-Sixth valve, 15-Sixth pipeline, 16-Filter, 17-Seventh valve, 18-Seventh pipeline, 19-Eighth valve, 20-Eighth pipeline, 21-Ninth valve, 22-Check valve. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figure 1 As shown, a closed sampler for catalyst sampling includes a first tube assembly, a sampling tank 11, and a second tube assembly.

[0029] The first pipe assembly includes a first pipe 2, a second pipe 5, a third pipe 7, and a fourth pipe 9. One end of the first pipe 2 is connected to the catalyst pipe 1, and the angle between them is an acute angle. A first valve 3 and a second valve 4 are installed on the first pipe 2, with the first valve 3 being closer to the catalyst pipe 1 than the second valve 4.

[0030] One end of the second pipe 5 is connected to the first pipe 2 and is located between the first valve 3 and the catalyst pipe 1. A third valve 6 is installed on the second pipe 5. One end of the third pipe 7 is connected to the first pipe 2 and is located between the first valve 3 and the second valve 4. A fourth valve 8 is installed on the third pipe 7. Both the second pipe 5 and the third pipe 7 are perpendicular to the first pipe 2. The third valve 6 and the fourth valve 8 are used to connect low-pressure steam.

[0031] One end of the fourth pipe 9 is connected to the first pipe 2 and is located between the third pipe 7 and the second valve 4. The angle between the fourth pipe 9 and the first pipe 2 is an acute angle. Specifically, the angles between the first pipe 2 and the catalyst pipe 1, as well as the angle between the first pipe 2 and the fourth pipe 9, are both α, where α is 30°-45°, preferably 38°. A fifth valve 10 is installed on the fourth pipe 9.

[0032] The sampling container 11 is vertically arranged, with its upper part connected to the end of the fourth pipe 9 furthest from the first pipe 2. The volume of the sampling container 11 is 0.5-1.5L, preferably 1.0L. The upper half of the sampling container 11 is cylindrical, and the lower half is an inverted cone, with the included angle β of the conical inclined plane being 45°-60°, preferably 52°.

[0033] The sampling tank 11 is connected to a pressure gauge 13 via a fifth pipe 12. The pressure gauge 13 is a Bourdon tube pressure gauge with a range of 0-1.6 MPa. A sixth valve 14 is installed on the fifth pipe 12. The sampling tank 11 is connected to a filter 16 via a sixth pipe 15. Specifically, the filter 16 is vertically installed on the top of the sampling tank 11, and its interior uses a high-temperature resistant sintered metal filter element. The filter 16 has an accuracy of 10-30 μm, preferably 20 μm. A seventh valve 17 is installed on the sixth pipe 15.

[0034] The second pipe assembly includes a seventh pipe 18 and an eighth pipe 20. One end of the seventh pipe 18 is connected to the bottom of the sampling tank 11, and the other end is equipped with an eighth valve 19. The diameter of the seventh pipe 18 is 30-50 mm, preferably 40 mm. One end of the eighth pipe 20 is connected to the seventh pipe 18 and is located between the eighth valve 19 and the sampling tank 11. The other end of the eighth pipe 20 is equipped with a ninth valve 21. A one-way valve 22 is located in the middle of the eighth pipe 20. The end of the one-way valve 22 closest to the ninth valve 21 is the air inlet, and the other end is the air outlet. The ninth valve 21 is used to connect unpurified compressed air.

[0035] Among them, the first pipe 2, the second pipe 5, the third pipe 7, the fourth pipe 9, the fifth pipe 12, the sixth pipe 15, the seventh pipe 18, and the eighth pipe 20 are all carbon steel pipes or stainless steel pipes. The first valve 3, the second valve 4, the third valve 6, the fourth valve 8, the fifth valve 10, the sixth valve 14, the seventh valve 17, the eighth valve 19, and the ninth valve 21 are all gate valves.

[0036] In addition, the first pipe 2 is detachably connected to the catalyst pipe 1 via a flange assembly. The second pipe 5, third pipe 7, and fourth pipe 9 are all detachably connected to the first pipe 2 via flange assemblies. The fourth pipe 9, fifth pipe 12, sixth pipe 15, and seventh pipe 18 are all detachably connected to the sampling tank 11 via flange assemblies. The eighth pipe 20 is detachably connected to the seventh pipe 18 via a flange assembly. All flange assemblies are equipped with sealing gaskets and are locked in place using several double-ended studs and nuts. Each flange assembly consists of two mating flanges.

[0037] The operating method of this utility model patent is as follows: Confirm that valves 14 (sixth) and 17 (seventh) are open, and valves 4 (second) and 19 (eighth) are closed. Then, close valves 6 (third), 8 (fourth), and 21 (ninth) in sequence. Next, open valves 10 (fifth) and 3 (first) in sequence to deliver catalyst into the sampling tank 11. Once the temperature of the sampling tank has significantly increased, close valves 3 (first) and 10 (fifth) in sequence. Then, slowly open valve 19 to release the catalyst into the sampling tank. After sampling, empty any remaining catalyst from the sampling tank 11 and close valve 19. After sampling is complete, open valve 6 to restore the loose steam at the sampling point.

[0038] It should be noted that the sampling container 11 is normally at room temperature, while the catalyst is at over 500 degrees Celsius. When the catalyst enters the sampling container 11, a noticeable temperature change can be felt. Alternatively, a bimetallic thermometer (temperature sensor) can be installed in the sampling container 11 to monitor the temperature inside the sampling container 11 and display the temperature change directly.

[0039] This invention achieves sealed sampling by using a sampling tank 11 to temporarily store the catalyst required for sampling and a filter 16 to filter out catalyst dust emitted during sampling. Compared with existing technologies, this invention is simpler and more effective, ensuring smooth catalyst extraction during the sampling process while reducing catalyst dust emissions, thus protecting the environment and human health.

[0040] All pipes used in this invention are detachable, which ensures that if the sampler malfunctions, it can be quickly replaced with spare parts without ignition. It has the advantages of simple structure, easy operation, easy maintenance, and quick replacement of vulnerable parts.

[0041] The above description is a detailed description of the preferred embodiments of the present utility model. However, the embodiments are not intended to limit the scope of the patent application of the present utility model. All equivalent changes or modifications made under the technical spirit of the present utility model should fall within the patent scope covered by the present utility model.

Claims

1. A sealed sampler for catalyst sampling, characterized in that, include: The first pipe assembly includes a first pipe, a second pipe, a third pipe, and a fourth pipe. One end of the first pipe is connected to a catalyst pipe, and the angle between them is an acute angle. A first valve and a second valve are installed on the first pipe, with the first valve being closer to the catalyst pipe than the second valve. One end of the second pipe is connected to the first pipe and is located between the first valve and the catalyst pipe, and a third valve is installed on the second pipe. One end of the third pipe is connected to the first pipe and is located between the first valve and the second valve, and a fourth valve is installed on the third pipe. One end of the fourth pipe is connected to the first pipe and is located between the third pipe and the second valve, with the angle between the fourth pipe and the first pipe being an acute angle, and a fifth valve is installed on the fourth pipe. A sampling tank is vertically installed, with its upper part connected to the end of the fourth pipe away from the first pipe. The sampling tank is connected to a pressure gauge via a fifth pipe, and a sixth valve is installed on the fifth pipe. The sampling tank is connected to a filter via a sixth pipe, and a seventh valve is installed on the sixth pipe. The second pipe assembly includes a seventh pipe and an eighth pipe; one end of the seventh pipe is connected to the bottom of the sampling tank, and the other end is equipped with an eighth valve. One end of the eighth pipe is connected to the seventh pipe and is located between the eighth valve and the sampling tank. The other end of the eighth pipe is equipped with a ninth valve. A one-way valve is installed in the middle of the eighth pipe, and the end of the one-way valve near the ninth valve is the air inlet.

2. The sealed sampler for catalyst sampling according to claim 1, characterized in that: The first, second, third, fourth, fifth, sixth, seventh, and eighth pipelines are all carbon steel pipes or stainless steel pipes; the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth valves are all gate valves.

3. A sealed sampler for catalyst sampling according to claim 1, characterized in that: The second and third pipes are both set perpendicular to the first pipe.

4. A sealed sampler for catalyst sampling according to claim 1, characterized in that: The angle between the first pipe and the catalyst pipe, as well as the angle between the first pipe and the fourth pipe, are both α, where α is 30°-45°.

5. A sealed sampler for catalyst sampling according to claim 1, characterized in that: The diameter of the seventh pipe is 30-50mm.

6. A sealed sampler for catalyst sampling according to claim 1, characterized in that: The first pipeline is detachably connected to the catalyst pipeline via a flange assembly; the second, third, and fourth pipelines are all detachably connected to the first pipeline via flange assemblies; the fourth, fifth, sixth, and seventh pipelines are all detachably connected to the sampling tank via flange assemblies; the eighth pipeline is detachably connected to the seventh pipeline via a flange assemblies; all flange assemblies are equipped with sealing gaskets and are locked together by several double-ended studs and nuts.

7. A sealed sampler for catalyst sampling according to claim 1, characterized in that: The volume of the sampling container is 0.5-1.5L.

8. A sealed sampler for catalyst sampling according to claim 1, characterized in that: The upper part of the sampling container is cylindrical, and the lower part is an inverted cone with an included angle β of 45°-60° on the inclined plane of the cone.

9. A sealed sampler for catalyst sampling according to claim 1, characterized in that: The filter is installed vertically on the top of the sampling tank, and its interior uses a high-temperature resistant sintered metal filter element. The filter has an accuracy of 10-30μm.

10. A sealed sampler for catalyst sampling according to claim 1, characterized in that: The pressure gauge is a Bourdon tube pressure gauge with a range of 0-1.6 MPa.

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