Powder sampling device, method and application

Abstract

The invention provides a powder sampling device and method and application, and belongs to the field of chemical equipment. The powder sampling device comprises: a pneumatic sampler connected to a material storage hopper or a blanking pipeline; the sampling collector is connected with a discharge port of the pneumatic sampler; and the exhaust assembly is connected with the sampling collector and the material storage hopper or the blanking pipeline, and the exhaust assembly is also connected with an air inlet pipe. The exhaust assembly is connected with the sampling collector and the material storage hopper or the discharging pipeline, so that the whole sampling process is carried out in a closed environment, and harmful gas in the system is extracted and returned to the material storage hopper or the discharging pipeline after sampling is finished, so that leakage of the harmful gas in the sampling process is avoided, and the sampling efficiency is improved. And continuous sampling can be carried out, so that the sampling efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of chemical equipment, specifically relating to a powder sampling device, method, and application. Background Technology

[0002] In existing chemical plants, some production processes contain powder conveying systems containing flammable, explosive, toxic, and harmful gases such as hexane and pentane, which must not be leaked into the environment. Sampling devices for these systems typically employ two methods:

[0003] One method uses a pneumatic drawer-type sampler to prevent the leakage of harmful gases. This is a non-continuous sampling method. During sampling, a cylinder pushes the sampler into the container or pipe. Once the sampling chamber is full, the cylinder reverses its movement to retract the sampler, and the material falls into the sampling collector below, completing one sampling action. Due to the limited volume of the sampling chamber, only a few tens of grams of material can usually be sampled at a time, and each action takes tens of seconds. For sampling requirements of 3-5 kg ​​per batch, multiple actions are required to complete the sampling, which is time-consuming and results in a high failure rate due to frequent cylinder actions.

[0004] Secondly, sampling can be achieved using pneumatic plunger valves or ball valves, enabling continuous sampling. During sampling, a cylinder pushes the valve core into the container or pipeline (plunger valve), or rotates the valve core (ball valve), ensuring unobstructed sampling channels. Material flows from inside the equipment to the sampling collector below, achieving continuous sampling. During sampling, because the internal pressure of the equipment is higher than the external pressure, harmful gases may flow out along with the material and leak into the environment. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art and provide a powder sampling device, method and application, which can realize continuous and efficient sampling of solid powder while effectively preventing internal harmful gases from leaking into the surrounding environment.

[0006] This invention is achieved through the following technical solution:

[0007] A first aspect of the present invention provides a powder sampling device, comprising:

[0008] A pneumatic sampler is connected to a material storage hopper or a discharge pipe.

[0009] A sampling collector is connected to the discharge port of the pneumatic sampler;

[0010] An exhaust assembly is connected to the sampling collector and the material storage hopper or discharge pipe, and an air inlet pipe is also connected to the exhaust assembly.

[0011] A further improvement of the present invention is that:

[0012] The sampling collector includes a collector cylinder and a top cover, and the collector cylinder and the top cover are connected by a snap fastener;

[0013] A high-level switch is installed inside the collector cylinder.

[0014] A further improvement of the present invention is that:

[0015] The top cover is provided with a first inlet, a second inlet, and an outlet. The first inlet is connected to the pneumatic sampler through a first pipeline.

[0016] Both the second inlet and outlet are connected to the exhaust assembly.

[0017] A further improvement of the present invention is that:

[0018] A first manual ball valve is installed on the first pipeline.

[0019] A further improvement of the present invention is that:

[0020] The exhaust assembly includes a cyclone separator and an injector;

[0021] The cyclone separator includes a separator body, a powder outlet at the bottom, a gas outlet at the top, a gas inlet at the upper part of the side wall, a gas inlet connected to the discharge port via a second pipeline, a powder outlet connected to the second feed port via a third pipeline, and a gas outlet connected to the ejector.

[0022] A further improvement of the present invention is that:

[0023] A second manual ball valve is installed on the second pipeline; and / or,

[0024] A third manual ball valve is installed on the third pipeline.

[0025] A further improvement of the present invention is that:

[0026] The injector includes an injector body, which includes a first air inlet, a second air inlet, and an air outlet.

[0027] The first air inlet is connected to the air inlet pipe;

[0028] The second air inlet is connected to the gas outlet of the cyclone separator via a fourth pipeline;

[0029] The air outlet is connected to the material storage hopper or the discharge pipe via a pipeline.

[0030] A further improvement of the present invention is that:

[0031] A fourth manual ball valve is installed on the fourth pipeline; and / or,

[0032] A fifth manual ball valve is installed on the air intake pipe.

[0033] A second aspect of the present invention provides a powder sampling method, wherein the powder sampling device is used for sampling, specifically:

[0034] First, nitrogen gas is introduced through the intake pipe to make the sampling collector and exhaust assembly both under a slight negative pressure.

[0035] Turn on the pneumatic sampler to start feeding. The powder falls into the sampling collector under gravity. At the same time, the gas in the sampling collector carries the dust into the exhaust assembly for gas-solid separation. The separated solids fall back into the sampling collector, and the gas enters the material storage hopper or feeding pipe. When the sampling volume reaches the requirement, turn off the pneumatic sampler. After a delay of 10 to 30 seconds, purge the gas from the sampling collector, exhaust assembly, and pipeline. Then disconnect the sampling collector from the pneumatic sampler and exhaust assembly. Adjust the internal and external pressure of the sampling collector to balance, and then disassemble the sampling collector to complete the powder sampling.

[0036] A third aspect of the invention provides the application of the powder sampling device in powder sample sampling.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] This invention connects the exhaust assembly to the sampling collector and the material storage hopper or discharge pipe respectively, so that the entire sampling process is carried out in a closed environment. After sampling, the harmful gases in the system are extracted and returned to the material storage hopper or discharge pipe, thereby avoiding leakage of harmful gases during the sampling process and enabling continuous sampling, thus improving sampling efficiency.

[0039] In this invention, the sampled powder falls into the sampling collector below under the action of gravity after passing through the pneumatic sampler, which avoids wear on the surface of the powder and ensures the integrity of the sampled powder is not damaged as much as possible. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of a powder sampling device provided by the present invention;

[0041] Figure 2 This is a schematic diagram of the injector structure in this invention.

[0042] In the picture,

[0043] 1. Material storage hopper or discharge pipe;

[0044] 2. Pneumatic sampler;

[0045] 3. Sampling collector;

[0046] 4. High level switch;

[0047] 5. Cyclone separator;

[0048] 6. Injector;

[0049] 7. First pipeline;

[0050] 8. First manual ball valve;

[0051] 9. Second pipeline;

[0052] 10. Second manual ball valve;

[0053] 11. Third pipeline;

[0054] 12. Third manual ball valve;

[0055] 13. Fourth pipeline;

[0056] 14. Fourth manual ball valve;

[0057] 15. Air intake pipe;

[0058] 16. Fifth manual ball valve. Detailed Implementation

[0059] The present invention will now be described in further detail with reference to the accompanying drawings:

[0060]

Example 1

[0061] like Figure 1 As shown, an embodiment of the present invention provides a powder sampling device, comprising:

[0062] Pneumatic sampler 2 is connected to the material storage hopper or the discharge pipe 1;

[0063] Sampling collector 3 is connected to the discharge port of pneumatic sampler 2.

[0064] The exhaust assembly is connected to the sampling collector 3 and the material storage hopper or discharge pipe 1, and the exhaust assembly is also connected to the air inlet pipe 15.

[0065] In this invention, the pneumatic sampler 2 is either a pneumatic ball valve or a plunger valve, both of which are existing technologies and will not be described in detail here.

[0066] When using the device of this invention for sampling, first install the sampling collector 3 and ensure effective sealing. Then, introduce nitrogen gas through the air inlet pipe to create a slight negative pressure in the sampling collector 3 and the exhaust assembly. Turn on the pneumatic sampler 2 to start feeding. The powder falls into the sampling collector 3 under gravity. At the same time, the gas in the sampling collector carries the dust into the exhaust assembly for gas-solid separation. The separated solids fall back into the sampling collector 3, and the gas enters the material storage hopper or the feeding pipe 1. When the sampling amount reaches the requirement, turn off the pneumatic sampler 2. After a delay of 10 to 30 seconds, purge the gas from the sampling collector 3, the exhaust assembly, and the pipe. Then disconnect the sampling collector 3 from the pneumatic sampler 2 and the exhaust assembly, and adjust the internal and external pressure balance of the sampling collector 3. The sampling collector 3 can then be disassembled to complete the powder sampling.

[0067] In this invention, the sampled powder falls into the sampling collector 3 below under the action of gravity after passing through the pneumatic sampler 2, which avoids wear on the surface of the powder and ensures the integrity of the sampled powder is not damaged as much as possible.

[0068] This invention connects the exhaust assembly to the sampling collector 3 and the material storage hopper or discharge pipe 1 respectively, so that the entire sampling process is carried out in a closed environment. After the sampling is completed, the harmful gas in the system is extracted and returned to the material storage hopper or discharge pipe 1, thereby avoiding the leakage of harmful gas during the sampling process and enabling continuous sampling, thus improving the sampling efficiency.

[0069]

Example 2

[0070] The sampling collector 3 includes a collector cylinder and a top cover. The collector cylinder and the top cover are connected by a snap-fit. A sealing strip is provided at the connection between the collector cylinder and the top cover for sealing. A high-level switch 4 is installed inside the collector cylinder to detect the level of powder in the sampling collector 3. During the sampling process, when the high-level switch 4 detects that the powder has reached the sampling level, the pneumatic sampler 2 closes and stops feeding.

[0071] It should be noted that the high level switch 4 can be connected to the pneumatic sampler 2 through a PLC controller or DCS control system. When the high level switch 4 detects the level of powder in the sampling collector 3, it sends an alarm signal to the PLC controller or DCS control system. The PLC controller or DCS control system then controls the pneumatic sampler 2 to shut down. This structure is a mature existing technology and will not be described in detail here.

[0072] The top cover is equipped with a first inlet, a second inlet, and an outlet. The first inlet is connected to the pneumatic sampler 2 via a first pipeline. A first manual ball valve 8 is installed on the first pipeline 7. The first manual ball valve 8 is a pressure balancing valve. After sampling, it is used to adjust the pressure to achieve air pressure balance inside and outside the sampling collector 3, so as to facilitate the disassembly of the sampling collector 3. The second inlet and the outlet are both connected to the exhaust assembly. The dust in the sampling collector 3 enters the exhaust assembly through the outlet for gas-solid separation. The separated solids fall back into the sampling collector 3 through the second inlet, and the gas enters the material storage hopper or the discharge pipe 1, thereby avoiding the leakage of harmful gases during the sampling process.

[0073]

Example 3

[0074] The exhaust assembly includes a cyclone separator 5 and an ejector 6. The cyclone separator 5 includes a separator body with a powder outlet at the bottom, a gas outlet at the top, and a gas inlet on the upper side wall. The gas inlet is connected to the discharge port on the top cover of the sampling collector 3 via a second pipeline 9. The powder outlet is connected to the second feed port on the top cover of the sampling collector 3 via a third pipeline 11. The gas outlet is connected to the ejector 6. The dust in the sampling collector 3 enters the separator body sequentially through the discharge port and the gas inlet for gas-solid separation. The separated solids fall back into the sampling collector 3 sequentially through the powder outlet and the second feed port. The gas enters the material storage hopper or the discharge pipe 1 sequentially through the gas outlet and the ejector 6, thereby avoiding the leakage of harmful gases during the sampling process.

[0075] Preferably, a second manual ball valve 10 is provided on the second pipeline 9, and a third manual ball valve 12 is provided on the third pipeline 11.

[0076] In this invention, the cyclone separator 5 serves only as a gas-solid separator for exhaust. On one hand, it is used to discharge gaseous dust from the sampling collector 3, preventing air resistance from affecting the smooth feeding of the sampled powder; on the other hand, it is used to vent all the gas in the entire device after sampling, preventing gas leakage. In actual sampling, the required exhaust gas volume is very small, which also avoids carrying too much sampled material in the exhaust, having almost no impact on the final sampled material.

[0077]

Example 4

[0078] like Figure 2 As shown, the injector 6 includes an injector body 601, which includes a first air inlet 602, a second air inlet 603, and an air outlet 604. The first air inlet 602 is connected to the air inlet pipe 16, the second air inlet 603 is connected to the gas outlet of the cyclone separator 5 through the fourth pipeline 13, and the air outlet 604 is connected to the material storage hopper or the discharge pipe 1 through a pipeline.

[0079] Preferably, a fourth manual ball valve 14 is provided on the fourth pipeline 13 to adjust the exhaust gas volume. When the appropriate gas volume is determined during the debugging before sampling, the opening of the fourth manual ball valve 14 is locked.

[0080] Preferably, a fifth manual ball valve 16 is provided on the air intake pipe 15.

[0081] After gas-solid separation by cyclone separator 5, the gas enters the injector 6 through the fourth pipeline 13. At the same time, high-pressure nitrogen is introduced through the air inlet pipe 15 to provide power. As the gas is rapidly compressed in the injector body 601 and injected, a local negative pressure is formed, which helps to draw the gas discharged from cyclone separator 5 into the air outlet 604 of injector 6 and discharge it into the material storage hopper or the discharge pipe 1.

[0082]

Example 5

[0083] This invention provides a powder sampling method, which uses the powder sampling device described in the above embodiments for sampling, specifically including:

[0084] During operation, first install the sampling collector 3 and ensure effective sealing; determine the exhaust volume and lock the opening of the fourth manual ball valve 14;

[0085] Next, close the first manual ball valve 8, open the second manual ball valve 10 and the third manual ball valve 12, and open the fifth manual ball valve 16 to introduce nitrogen into the air inlet pipe 15, so that the sampling collector 3 and the cyclone separator 5 are both in a slightly negative pressure state.

[0086] Next, the pneumatic sampler 2 is turned on to start feeding. The powder falls into the sampling collector 3 under the action of gravity. At the same time, the gas in the sampling collector 3 carries the dust into the cyclone separator 5 for gas-solid separation. The separated solids fall back into the sampling collector 3, and the gas enters the ejector 6. With the help of nitrogen, it enters the material storage hopper or the discharge pipe 1. When the high material level switch 4 alarms, the pneumatic sampler 2 is turned off to stop feeding. After a delay of 10 to 30 seconds, the gas in the sampling collector 3, the cyclone separator 5 and the pipeline is discharged. Then, the second manual ball valve 10 and the third manual ball valve 12 are closed to isolate the sampling collector 3 from the material storage hopper or the discharge pipe 1 and the cyclone separator 5, respectively, so as to ensure that no gas leaks out when the sampling collector 3 is disassembled.

[0087] Finally, after opening the first manual ball valve 8 to balance the air pressure inside and outside the sampling collector 3, the sampling collector 3 is disassembled to complete the powder sampling.

[0088] This invention connects the exhaust assembly to the sampling collector 3 and the material storage hopper or discharge pipe 1 respectively, so that the entire sampling process is carried out in a closed environment. After the sampling is completed, the harmful gas in the system is extracted and returned to the material storage hopper or discharge pipe 1, thereby avoiding the leakage of harmful gas during the sampling process and enabling continuous sampling, thus improving the sampling efficiency.

[0089] In this invention, the sampled powder falls into the sampling collector 3 below under the action of gravity after passing through the pneumatic sampler 2, which avoids wear on the surface of the powder and ensures the integrity of the sampled powder is not damaged as much as possible.

[0090] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0091] In the description of this invention, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0092] The above technical solution is only one embodiment of the present invention. For those skilled in the art, based on the principles disclosed in the present invention, it is easy to make various types of improvements or modifications, and not limited to the technical solutions described in the specific embodiments of the present invention. Therefore, the foregoing description is only a preferred option and is not restrictive.

Claims

1. A powder sampling device, characterized in that, include: A pneumatic sampler is connected to a material storage hopper or a discharge pipe. A sampling collector is connected to the discharge port of the pneumatic sampler; An exhaust assembly is connected to the sampling collector and the material storage hopper or discharge pipe, and an air inlet pipe is also connected to the exhaust assembly.

2. The powder sampling device according to claim 1, characterized in that, The sampling collector includes a collector body and a top cover, and the collector body and the top cover are connected by a snap fastener; A high-level switch is installed inside the collector cylinder.

3. The powder sampling device according to claim 2, characterized in that, The top cover is provided with a first inlet, a second inlet, and an outlet. The first inlet is connected to the pneumatic sampler through a first pipeline. Both the second inlet and outlet are connected to the exhaust assembly.

4. The powder sampling device according to claim 3, characterized in that, A first manual ball valve is installed on the first pipeline.

5. The powder sampling device according to claim 3, characterized in that, The exhaust assembly includes a cyclone separator and an injector; The cyclone separator includes a separator body, a powder outlet at the bottom, a gas outlet at the top, a gas inlet at the upper part of the side wall, a gas inlet connected to the discharge port via a second pipeline, a powder outlet connected to the second feed port via a third pipeline, and a gas outlet connected to the ejector.

6. The powder sampling device according to claim 5, characterized in that, A second manual ball valve is installed on the second pipeline; and / or, A third manual ball valve is installed on the third pipeline.

7. The powder sampling device according to claim 5, characterized in that, The injector includes an injector body, which includes a first air inlet, a second air inlet, and an air outlet. The first air inlet is connected to the air inlet pipe; The second air inlet is connected to the gas outlet of the cyclone separator via a fourth pipeline; The air outlet is connected to the material storage hopper or the discharge pipe via a pipeline.

8. The powder sampling device according to claim 7, characterized in that, A fourth manual ball valve is installed on the fourth pipeline; and / or, A fifth manual ball valve is installed on the air intake pipe.

9. A method for sampling powder, characterized in that, Sampling is performed using the powder sampling device as described in any one of claims 1-8, specifically as follows: First, nitrogen gas is introduced through the intake pipe to make the sampling collector and exhaust assembly both under a slight negative pressure. Turn on the pneumatic sampler to start feeding. The powder falls into the sampling collector under gravity. At the same time, the gas in the sampling collector carries the dust into the exhaust assembly for gas-solid separation. The separated solids fall back into the sampling collector, and the gas enters the material storage hopper or feeding pipe. When the sampling volume reaches the requirement, turn off the pneumatic sampler. After a delay of 10 to 30 seconds, purge the gas from the sampling collector, exhaust assembly, and pipeline. Then disconnect the sampling collector from the pneumatic sampler and exhaust assembly. Adjust the internal and external pressure of the sampling collector to balance, and then disassemble the sampling collector to complete the powder sampling.

10. The application of the powder sampling device as described in any one of claims 1-8 in powder sample sampling.

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