Portable intelligent pulverized coal constant-speed sampling device and sampling method

Abstract

The invention provides a portable intelligent pulverized coal constant-speed sampling device and a sampling method.The device comprises a flat-head type pulverized coal constant-speed sampling pipe, a flexible sealing device, a cyclone separator and an intelligent control box, and the flat-head type pulverized coal constant-speed sampling pipe and the intelligent control box are connected through a pulverized coal airflow static pressure connecting pipe and a sampling head inner static pressure connecting pipe; one end of the flexible sealing device is arranged on the flat-head type pulverized coal constant-speed sampling pipe in a sleeving mode, the other end of the flexible sealing device is arranged on the sampling pipe base in a sleeving mode, the flexible sealing device and the intelligent control box are connected through a sealing air pressure connecting pipe and a sealing air connecting pipe, and one end of the cyclone separator is connected with the tail of the sampling pipe. And the other end is connected with the intelligent control box through an exhaust connecting pipe. The capacity pump powered by the battery is used for generating negative pressure, noise is low, the weight is light, moving is convenient and fast, airflow at an outlet of the capacity pump can be used as sealing air to be conveyed into the flexible sealing device, and it is guaranteed that pulverized coal airflow in a pulverized coal pipeline cannot be sprayed out of the sampling pipe base in the whole sampling process.

Description

Technical Field

[0001] The present invention relates to the technical field of coal powder sampling, and in particular to a portable intelligent coal powder isokinetic sampling device and a sampling method. Background Art

[0002] Coal powder fineness is a strictly controlled indicator in the operation of coal-fired power plant boilers, and is also an important parameter for optimizing combustion and improving the economic efficiency of boiler operation. Since the coal powder conveying pipeline of the boiler direct-blowing pulverizing system is under positive pressure, a special coal powder sampling device is required for coal powder sampling. Coal powder sampling should follow the sampling requirements of constant velocity and equal annular area to make the sample representative. However, the coal powder sampling device currently commonly used in coal-fired power plants still has the following shortcomings in actual use:

[0003] (1) A negative pressure generator powered by compressed air is used. The negative pressure generated by the negative pressure generator is insufficient to meet the requirements of isokinetic sampling. The negative pressure generator needs to be connected to the factory compressed air pipeline with a pipeline. The connecting pipeline is long and affects the convenience of moving the sampling device. The noise generated during the throttling process of the negative pressure generator seriously damages the hearing health of the operator.

[0004] (2) There are various types of sampling tube holders, most of which do not have sealing devices. When sampling, the coal powder in the coal powder pipeline will spray out from the gap between the sampling tube holder and the sampling device, polluting the environment and making the sampling working environment harsh. The exhaust gas of the sampling device is directly discharged into the atmosphere, causing environmental pollution.

[0005] (3) The sampling time and sampling position are determined manually, which cannot meet the accurate sampling requirements of equal time and equal annular area. During the sampling process, it is necessary to check the pressure gauge reading while manually adjusting the opening of the pressure regulating valve. The sampling pressure cannot be adjusted in time according to the pressure change in the pulverized coal pipeline, and true isokinetic sampling cannot be achieved. The operation is arbitrary, and human factors have a great impact on the consistency and representativeness of the sampling results.

[0006] (4) The static pressure hole of the sampling device is prone to clogging. The static pressure hole of the pulverized coal isokinetic sampling device is prone to clogging during use, and there is no effective means to determine whether it is blocked during the sampling process. The only way to determine whether the sampling is normal is based on the weight and characteristics of the sample after the sampling is completed, resulting in low test efficiency and low accuracy.

[0007] (5) Using compressed air at room temperature to blow the sampling pipeline can easily cause condensation and coal powder deposition in the pipeline. Summary of the invention

[0008] In view of this, the present invention provides a portable intelligent coal powder isokinetic sampling device and sampling method to solve at least one of the above-mentioned problems.

[0009] In order to achieve the above object, the present invention adopts the following scheme:

[0010] According to a first aspect of the present invention, a portable intelligent coal powder isokinetic sampling device is provided, the device comprising: a flat-top coal powder isokinetic sampling tube, a flexible sealing device, a cyclone separator and an intelligent control box, the flat-top coal powder isokinetic sampling tube is inserted into the coal powder pipeline through a sampling tube seat, the flat-top coal powder isokinetic sampling tube and the intelligent control box are connected through a coal powder airflow static pressure connecting tube and a sampling head internal static pressure connecting tube, one end of the flexible sealing device is sleeved on the flat-top coal powder isokinetic sampling tube, and the other end is sleeved on the sampling tube seat, the flexible sealing device and the intelligent control box are connected through a sealed air pressure connecting tube and a sealed air connecting tube, one end of the cyclone separator is connected to the tail of the flat-top coal powder isokinetic sampling tube, and the other end is connected to the intelligent control box through an exhaust gas connecting tube.

[0011] As an embodiment of the present invention, the above-mentioned intelligent control box includes: a capacity pump, a first bypass and servo motor, a second bypass and servo motor, a sensor and a control system, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve and a seventh solenoid valve, wherein the first end of the first solenoid valve is connected to the exhaust gas connecting pipe, the second end of the first solenoid valve is connected to the first end of the first bypass and servo motor, the second end of the first bypass and servo motor is connected to the first end of the capacity pump, the second end of the capacity pump is connected to the first end of the second bypass and servo motor, and the second end of the second bypass and servo motor is respectively connected to the second solenoid valve, the third solenoid valve and the fourth solenoid valve. The first end of the solenoid valve is connected to the first end of the first solenoid valve through the first back-blowing pipe, the second end of the third solenoid valve is connected to the sealed air connecting pipe, the second end of the fourth solenoid valve is respectively connected to the sealed air pressure connecting pipe, the pulverized coal airflow static pressure connecting pipe and the sampling head internal static pressure connecting pipe, the first end of the fifth solenoid valve, the first end of the sixth solenoid valve and the first end of the seventh solenoid valve are respectively connected to the sensor and the control system, the second end of the fifth solenoid valve is connected to the sealed air pressure connecting pipe, the second end of the sixth solenoid valve is connected to the pulverized coal airflow static pressure connecting pipe, and the second end of the seventh solenoid valve is connected to the sampling head internal static pressure connecting pipe.

[0012] As an embodiment of the present invention, the intelligent control box further comprises a filter device, and the filter device is connected between the second end of the first solenoid valve and the first bypass and the first end of the servo motor.

[0013] As an embodiment of the present invention, the above-mentioned intelligent control box also includes a heating device, which is connected between the second bypass and the second end of the servo motor and the first ends of the second solenoid valve, the third solenoid valve, and the fourth solenoid valve.

[0014] As an embodiment of the present invention, the above-mentioned device also includes a laser rangefinder, which is arranged on the flat-head type coal powder isokinetic sampling tube, and the laser rangefinder communicates data with the sensor and control system through a wireless connection.

[0015] As an embodiment of the present invention, the above-mentioned cyclone separator includes a primary separator and a secondary separator, the first end of the primary separator is connected to the tail of the flat-head type coal powder isokinetic sampling tube, the second end of the primary separator is connected to the first end of the secondary separator, and the second end of the secondary separator is connected to the exhaust gas connecting pipe.

[0016] As an embodiment of the present invention, the main body material of the flexible sealing device is canvas, the overall shape is cylindrical and rubber rings are provided at both ends. The flexible sealing device is installed on the flat-head coal powder isokinetic sampling tube and the sampling tube seat through the rubber ring.

[0017] According to a second aspect of the present invention, a portable intelligent coal powder isokinetic sampling method is provided, and the method is performed by the portable intelligent coal powder isokinetic sampling device as described above, and the method comprises: inserting a flat-head coal powder isokinetic sampling tube into a coal powder pipeline to sample coal powder, and sensing the static pressure of the coal powder airflow and the static pressure in the sampling head through the flat-head coal powder isokinetic sampling tube; separating the coal powder in the sampled coal powder airflow through a cyclone separator, and collecting the separated coal powder in a sample collection bottle arranged at the lower part of the cyclone separator; conveying the exhaust gas generated by the cyclone separator to an intelligent control box through an exhaust gas connecting pipe; the intelligent control box adjusts the opening of the first bypass and the servo motor by monitoring the static pressure of the coal powder airflow and the static pressure in the sampling head, so that the static pressure of the coal powder airflow is equal to the static pressure in the sampling head, thereby realizing isokinetic sampling; at the same time, the intelligent control box also conveys the exhaust gas to the flexible sealing device, and adjusts the opening of the second bypass and the servo motor, so that the pressure in the flexible sealing device is greater than the pressure in the coal powder pipeline, thereby preventing coal powder from leaking.

[0018] According to a third aspect of the present invention, there is provided an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0019] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the above method when executed by a processor.

[0020] According to a fifth aspect of the present invention, there is provided a computer program product, comprising a computer program / instructions, which implement the steps of the above method when executed by a processor.

[0021] It can be seen from the above technical solution that the present application provides a portable intelligent coal powder isokinetic sampling device and sampling method, which abandons the traditional negative pressure generator powered by compressed air and uses a battery-powered capacity pump to generate negative pressure. The negative pressure is large and can be adjusted linearly. There are no external wires and compressed air pipelines, so the noise is small, the weight is light, and it is easy to move. In addition, the sampling device of the present application is designed with a flexible sealing device, which can use the airflow at the outlet of the capacity pump as the sealing wind to be transported to the flexible sealing device, thereby ensuring that the coal powder airflow in the coal powder pipeline will not be ejected from the sampling tube seat during the entire sampling process, thereby ensuring the cleanliness of the sampling working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 It is a structural schematic diagram of a portable intelligent coal powder isokinetic sampling device provided in an embodiment of the present application;

[0024] Figure 2 It is an enlarged schematic diagram of a flat-head type pulverized coal isokinetic sampling tube and a flexible sealing device provided in an embodiment of the present application;

[0025] Figure 3 It is a schematic diagram of the process of the portable intelligent coal powder isokinetic sampling method provided in the embodiment of the present application;

[0026] Figure 4 It is a structural schematic diagram of an intelligent control box provided in an embodiment of the present application;

[0027] Figure 5 is a schematic diagram of a screen and control buttons provided in an embodiment of the present application;

[0028] Figure 6 It is a schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0030] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0032] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0033] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0034] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0035] It should be understood that when a component is referred to as being “on another component,” “connected to another component,” “coupled to another component,” or “contacting another component,” it can be directly on, connected to, coupled to, or contacting the other component, or intervening components may be present. In contrast, when a component is referred to as being “directly on another component,” “directly connected to,” “directly coupled to,” or “directly contacting” another component, there are no intervening components present.

[0036] like Figure 1 The figure shows a schematic diagram of the structure of a portable intelligent coal powder isokinetic sampling device provided in an embodiment of the present application, which comprises Figure 1It can be seen that the sampling device includes the following parts: a flat-headed coal powder isokinetic sampling tube 10, a flexible sealing device 20, a cyclone separator 30 and an intelligent control box 40. The flat-headed coal powder isokinetic sampling tube 10 is inserted into the coal powder pipeline through a sampling tube seat. The flat-headed coal powder isokinetic sampling tube 10 and the intelligent control box 40 are connected through a coal powder airflow static pressure connecting tube 1 and a sampling head internal static pressure connecting tube 2. One end of the flexible sealing device 20 is sleeved on the flat-headed coal powder isokinetic sampling tube 10, and the other end is sleeved on the sampling tube seat. The flexible sealing device 20 and the intelligent control box 40 are connected through a sealed air pressure connecting tube 3 and a sealed air connecting tube 4. One end of the cyclone separator 30 is connected to the tail of the flat-headed coal powder isokinetic sampling tube 10, and the other end is connected to the intelligent control box 40 through an exhaust gas connecting tube 5.

[0037] The flat-headed pulverized coal isokinetic sampling tube 10 is a key component inserted into the pulverized coal pipeline for sampling. It is fixed and inserted into the pulverized coal pipeline through a sampling tube holder. Its head is flat, which helps to collect pulverized coal samples more accurately, and its structural design should ensure that the flow state of the pulverized coal airflow in the tube is stable during the sampling process to ensure the representativeness of the sampling. The "isokinetic" here means that the airflow velocity in the sampling tube must be consistent with the airflow velocity in the pulverized coal pipeline, so that the collected samples can accurately reflect the characteristics of the pulverized coal in the pulverized coal pipeline, such as the concentration and particle size distribution. In this embodiment, the flat-headed pulverized coal isokinetic sampling tube 10 can use an existing device, and its specific parameters can refer to DL / T 467-2019 "Performance Test of Power Plant Coal Mill and Pulverizing System", which will not be repeated here.

[0038] The flexible sealing device 20 is mounted on the flat-head coal powder isokinetic sampling tube 10 and the sampling tube holder to seal and prevent coal powder from leaking from the sampling port into the atmosphere, thereby ensuring the safety of the sampling process and avoiding environmental pollution. The flexible design enables it to adapt to sampling tubes and sampling tube holders of different sizes.

[0039] Preferably, the main body material of the flexible sealing device 20 in this embodiment can be canvas, the overall shape is cylindrical, and both ends of the opening are provided with rubber rings, and the flexible sealing device 20 is set on the flat-head type coal powder isokinetic sampling tube 10 and the sampling tube seat through the rubber ring. Figure 2 As shown in FIG. 1 , it is an enlarged schematic diagram of the flat-head type pulverized coal isokinetic sampling tube and the flexible sealing device provided in this embodiment. Figure 2 It can be seen that, without external force, the rubber rings at both ends of the flexible sealing device 20 will shrink and close, and when the flat-headed coal powder isokinetic sampling tube 10 is inserted into the flexible sealing device 20 from one end, the rubber ring can be tightly combined with the flat-headed coal powder isokinetic sampling tube 10. The other end of the flexible sealing device 20 is sleeved on the sampling tube holder, and the rubber ring can be tightly combined with the sampling tube holder.

[0040] Further preferably, Figure 1 and Figure 2 As shown, a quick connector is installed below the flexible sealing device 20 to facilitate connection with the sealed air connection pipe 4, and a quick connector is also installed above the flexible sealing device 20 to facilitate connection with the sealed air pressure connection pipe 3. Through the design of the quick connector, the sealed air pressure connection pipe 3, the sealed air connection pipe 4 and the flexible sealing device 20 can be quickly connected or disassembled, which is convenient for installation, maintenance and replacement of the device.

[0041] The sealing wind pressure connecting pipe 3 is used to connect the flexible sealing device 20 and the intelligent control box 40, so that the intelligent control box 40 can sense the sealing wind pressure in the flexible sealing device 20. The sealing wind connecting pipe 4 is also used to connect the flexible sealing device 20 and the intelligent control box 40, so that the intelligent control box 40 can deliver sealing wind to the flexible sealing device 20.

[0042] In this embodiment, the main function of the flexible sealing device 20 is to prevent the coal powder from leaking into the external environment from the interface where the sampling tube is inserted into the coal powder pipeline. In order to achieve this, the sealing wind pressure in the flexible sealing device 20 must be slightly higher than the pressure in the coal powder pipeline. Of course, the sealing wind pressure in the flexible sealing device 20 can only be slightly higher than the pressure in the coal powder pipeline, and cannot be too much higher. If the pressure is too much higher, it may cause the sealing wind to enter the coal powder pipeline in the reverse direction through the interface where the sampling tube is inserted into the coal powder pipeline. This leakage will disturb the air flow balance in the coal powder pipeline and affect the sampling accuracy. To this end, in this embodiment, the difference between the sealing wind pressure in the flexible sealing device 20 and the pressure in the coal powder pipeline can be limited to a threshold value, and this requires the intelligent control box 40 to be able to sense the sealing wind pressure in the flexible sealing device 20 in real time, and then adjust the air volume of the sealing wind output to the flexible sealing device 20. Therefore, in this embodiment, the intelligent control box 40 senses the sealing wind pressure in the flexible sealing device 20 in real time through the sealing wind pressure connecting pipe 3, and compares it with the pressure in the coal powder pipeline (obtained through the coal powder airflow static pressure connecting pipe 1). If the sealing air pressure is insufficient, the intelligent control box 40 can increase the sealing air pressure by adjusting the air volume of the sealing air connecting pipe 4 (for example, adjusting the opening of the second bypass and the servo motor) to ensure the sealing effect.

[0043] The cyclone separator 30 can adopt an existing device, which mainly plays the role of gas-solid separation. Preferably, the cyclone separator 30 in this embodiment can be divided into a primary separator and a secondary separator, and its material can be stainless steel. The first end of the primary separator is connected to the tail of the flat-head coal powder isokinetic sampling tube 10 through a thread, and its second end is connected to the first end of the secondary separator. For example, a stainless steel pipe can be used to weld the primary separator and the secondary separator together. The second end (tail) of the secondary separator can be designed as a quick connector, and then connected to the exhaust gas connecting pipe 5. The lower part of the primary separator and the secondary separator is a sample collection bottle, and the coal powder separated by the separator in the coal powder airflow is stored in the sample collection bottle.

[0044] On the one hand, the intelligent control box 40 is connected to the cyclone separator 30 through the exhaust gas connecting pipe 5, and on the other hand, it is also connected to the flexible sealing device 20 through the sealing wind pressure connecting pipe 3 and the sealing wind connecting pipe 4, and is also connected to the flat-head coal powder isokinetic sampling tube 10 through the coal powder airflow static pressure connecting pipe 1 and the sampling head internal static pressure connecting pipe 2.

[0045] In this embodiment, the intelligent control box 40 is used to sense the sealing air pressure in the flexible sealing device 20 through the sealing air pressure connecting pipe 3, and dynamically adjust the sealing air pressure delivered to the flexible sealing device 20 through the sealing air connecting pipe 4 according to the pressure change in the coal powder pipeline, to ensure that the sealing air pressure is always slightly higher than the pressure in the coal powder pipeline, to prevent coal powder leakage. In addition, it is also used to monitor the static pressure difference inside and outside the flat-head coal powder isokinetic sampling tube 10 through the coal powder airflow static pressure connecting pipe 1 and the sampling head internal static pressure connecting pipe 2, to ensure that the airflow velocity in the sampling tube is consistent with the airflow velocity in the coal powder pipeline, thereby achieving isokinetic sampling. Finally, the intelligent control box 40 also receives the exhaust gas separated by the cyclone separator 30 through the exhaust gas connecting pipe 5, and processes the exhaust gas (such as filtering, heating, etc.), and then uses it for back-blowing the sampling pipeline or delivering it to the flexible sealing device 20 as sealing air.

[0046] Accordingly, the present application also provides a portable intelligent coal powder isokinetic sampling method, such as Figure 3 As shown, the sampling method comprises the following steps:

[0047] Step S301: inserting a flat-headed pulverized coal isokinetic sampling tube into a pulverized coal pipeline to sample the pulverized coal, and sensing the static pressure of the pulverized coal airflow and the static pressure inside the sampling head through the flat-headed pulverized coal isokinetic sampling tube.

[0048] Step S302: separating the coal powder in the sampled coal powder airflow through a cyclone separator, and collecting the separated coal powder in a sample collection bottle arranged at the bottom of the cyclone separator.

[0049] Step S303: The exhaust gas generated by the cyclone separator is transported to the intelligent control box through the exhaust gas connecting pipe.

[0050] Step S304: The intelligent control box adjusts the opening of the first bypass and the servo motor by monitoring the static pressure of the coal powder airflow and the static pressure inside the sampling head, so that the static pressure of the coal powder airflow is equal to the static pressure inside the sampling head, thereby achieving constant speed sampling.

[0051] Step S305: The intelligent control box also delivers the exhaust gas to the flexible sealing device, and adjusts the opening of the second bypass and the servo motor so that the pressure in the flexible sealing device is greater than the pressure in the pulverized coal pipeline to prevent pulverized coal from leaking.

[0052] It should be pointed out that the above method steps do not mean that they are performed sequentially. When sampling, some steps can be performed simultaneously, and some steps can be performed sequentially. This application does not limit this.

[0053] It can be seen from the above technical solution that the present application provides a portable intelligent coal powder isokinetic sampling device, which abandons the traditional negative pressure generator powered by compressed air and uses a battery-powered capacity pump to generate negative pressure. The negative pressure is large and can be adjusted linearly. There are no external wires and compressed air pipelines, so the noise is small, the weight is light, and it is easy to move. In addition, the sampling device of the present application is designed with a flexible sealing device, which can use the airflow at the outlet of the capacity pump as the sealing wind to be transported to the flexible sealing device, thereby ensuring that the coal powder airflow in the coal powder pipeline will not be ejected from the sampling tube seat during the entire sampling process, thereby ensuring the cleanliness of the sampling working environment.

[0054] Preferably, Figure 4 As shown, it is a structural schematic diagram of an intelligent control box 40 provided in this embodiment, and the intelligent control box 40 includes: a capacity pump 401, a first bypass and servo motor 402, a second bypass and servo motor 403, a sensor and control system 404, a first solenoid valve 405, a second solenoid valve 406, a third solenoid valve 407, a fourth solenoid valve 408, a fifth solenoid valve 409, a sixth solenoid valve 410 and a seventh solenoid valve 411.

[0055] The connection relationship of the above-mentioned components is described as follows: the first end of the first solenoid valve 405 is connected to the exhaust gas connecting pipe 5, the second end of the first solenoid valve 405 is connected to the first end of the first bypass and servo motor 402, the second end of the first bypass and servo motor 402 is connected to the first end of the capacity pump 401, the second end of the capacity pump 401 is connected to the first end of the second bypass and servo motor 403, the second end of the second bypass and servo motor 403 is respectively connected to the first end of the second solenoid valve 406, the third solenoid valve 407 and the fourth solenoid valve 408, and the second end of the second solenoid valve 406 is connected to the first solenoid valve 406 through the first backflush pipe 412. The first end of the magnetic valve 405 and the second end of the third solenoid valve 407 are connected to the sealed air connecting pipe 4, the second end of the fourth solenoid valve 408 is respectively connected to the sealed air pressure connecting pipe 3, the coal powder airflow static pressure connecting pipe 1 and the sampling head internal static pressure connecting pipe 2, the first end of the fifth solenoid valve 409, the first end of the sixth solenoid valve 410 and the first end of the seventh solenoid valve 411 are respectively connected to the sensor and control system 404, the second end of the fifth solenoid valve 409 is connected to the sealed air pressure connecting pipe 3, the second end of the sixth solenoid valve 410 is connected to the coal powder airflow static pressure connecting pipe 1, and the second end of the seventh solenoid valve 411 is connected to the sampling head internal static pressure connecting pipe 2.

[0056] Preferably, in order to prevent the exhaust gas from polluting the atmosphere, the intelligent control box 40 of this embodiment further includes a filter device 414 connected between the second end of the first solenoid valve 405 and the first bypass and the first end of the servo motor 402 .

[0057] Preferably, in order to increase the temperature of the exhaust gas or sealing air and prevent condensation in the pipeline, moisture absorption and agglomeration of coal powder, and the influence of the low temperature environment on the operation of the equipment, the intelligent control box 40 of this embodiment also includes a heating device 415, which is connected between the second end of the second bypass and the servo motor 403 and the first ends of the second solenoid valve 406, the third solenoid valve 407, and the fourth solenoid valve 408.

[0058] The following is a description of each component in the intelligent control box 40:

[0059] Capacity pump 401: used to provide negative pressure suction force and sealing air for the entire sampling device.

[0060] First bypass and servo motor 402: The bypass pipeline is directly connected to the atmosphere, and the diameter of the pipeline is equal to the inlet pipeline of the capacity pump 401. The servo motor is used to control the opening of the bypass. The flow rate of the coal powder airflow through the flat-head type coal powder isokinetic sampling tube 10 can be adjusted by adjusting the bypass opening, thereby ensuring isokinetic sampling. A muffler can also be installed on the bypass to reduce noise.

[0061] Second bypass and servo motor 403: The bypass pipeline is directly connected to the atmosphere, and the diameter of the pipeline is equal to that of the outlet pipeline of the capacity pump 401. The servo motor is used to control the opening of the bypass. The bypass opening can be adjusted to ensure that the pressure in the flexible sealing device 20 is slightly greater than the pressure in the coal powder pipeline, so that the coal powder in the coal powder pipeline will not be sprayed out. The bypass can also be equipped with a muffler to reduce noise.

[0062] Sensor and control system 404: used to measure various pressures and control various devices in the intelligent control box. Each device in the intelligent control box is electrically connected to the sensor and control system 404 to ensure that the sensor and control system 404 can regulate it. It should be pointed out that Figure 4 Only the connection relationship between the sensor and control system 404 and the fifth solenoid valve 409, the sixth solenoid valve 410 and the seventh solenoid valve 411 is illustrated, while the connection relationship with other components is omitted. However, as long as the sensor and control system 404 can control it, there is an electrical connection relationship between them.

[0063] The first solenoid valve 405 is used to control the switch of the inlet of the capacity pump 401.

[0064] The second solenoid valve 406 is used to control the switch of the first backflush pipe 412 .

[0065] The third solenoid valve 407 is used to control the switch of the sealing air in the sealing air connecting pipe 4.

[0066] The fourth solenoid valve 408 is used to control the switch of the second backflush pipe 413 .

[0067] The fifth solenoid valve 409 is used to control the switch of the sealed wind pressure sensor inlet pipe.

[0068] The sixth solenoid valve 410 is used to control the switch of the inlet pipe of the coal powder airflow static pressure sensor.

[0069] The seventh solenoid valve 411 is used to control the switch of the static pressure sensor inlet pipe in the sampling head.

[0070] The first back-blowing pipe 412 is used to transport hot air for blowing the cyclone separator and the flat-head type coal powder isokinetic sampling pipe.

[0071] The second back-blowing pipe 413 is used to convey hot air for blowing the sealing wind pressure connecting pipe 3, the coal powder airflow static pressure connecting pipe 1 and the sampling head internal static pressure connecting pipe 2.

[0072] Filter device 414: used to filter coal powder in the exhaust gas, and the filter bag can be replaced regularly.

[0073] Heating device 415: used to heat the sealing air and the back-blowing air to prevent the cyclone separator, the flat-head type coal powder isokinetic sampling tube, the coal powder airflow static pressure tube and the static pressure tube in the sampling head from condensation and blockage during back-blowing.

[0074] Removable battery 416: used to supply power to various devices in the intelligent control box 40. The battery is removable, which is convenient for replacing the battery when the power is exhausted, ensuring the continuous use of the intelligent control box 40. Each device in the intelligent control box 40 that needs power is electrically connected to the removable battery.

[0075] Screen and control button 417: used to display the coal pulverized pipeline parameters that need to be input, real-time data during sampling and battery power, etc. The control button is used to control the intelligent control box 40. The control content can be referred to Figure 5 shown.

[0076] Speaker 418: used to issue a warning tone.

[0077] All components of the intelligent control box 40 are housed in a housing to ensure the stability and safety of the internal devices. When each pipeline is connected to the intelligent control box 40, it is connected by a quick connector, so that the connection of the pipeline is fast and tight.

[0078] Preferably, the sampling device further comprises a laser rangefinder, such as Figure 2 As shown, the laser rangefinder can be fixed on the flat-top coal powder isokinetic sampling tube 10 to measure the horizontal movement distance of the flat-top coal powder isokinetic sampling tube 10. The laser rangefinder is powered by its own battery and can perform wireless data transmission with the intelligent control box 40. The light emitted by the laser rangefinder can change color. When the flat-top coal powder isokinetic sampling tube 10 reaches the specified position of the coal powder pipeline, the light of the laser rangefinder turns green. When the flat-top coal powder isokinetic sampling tube 10 is not at the specified position, the light is red.

[0079] Based on the above structure of the intelligent control box 40, the sampling steps of the portable intelligent coal powder isokinetic sampling device provided by the present application are described in detail below, which may include the following steps:

[0080] Step 1: Assemble the portable intelligent coal powder isokinetic sampling device.

[0081] Step 2: Put one end of the flexible sealing device 20 on the sampling tube holder, and put the other end on the flat-head type coal powder isokinetic sampling tube 10.

[0082] Step 3: Click the "Start" button on the intelligent control box 40, and the intelligent control box 40 will start. At this time, you need to enter the size of the coal powder pipeline and the sampling time of a single sampling point, and the intelligent control box 40 will automatically calculate the position of each sampling point. At the same time, the first electromagnetic valve 405 is closed; the first bypass and the servo motor 402 are fully opened; the capacity pump 401 is started; the second bypass and the servo motor 403 are fully closed; the heating device 415 is started; the second electromagnetic valve 406 is opened; the third electromagnetic valve 407 is opened; the fourth electromagnetic valve 408 is opened; the fifth electromagnetic valve 409 is closed; the sixth electromagnetic valve 410 is closed; and the seventh electromagnetic valve 411 is closed. The capacity pump 401 will draw air from the atmosphere, and after heating, the hot air will be blown back to the cyclone separator 30 and the flat-head coal powder isovelocity sampling tube 10 through the first backblowing pipe 412, the hot air will be transported to the flexible sealing device 20 through the sealed air connecting pipe 4, and the hot air will be blown back to the sealed air pressure connecting pipe 3, the coal powder airflow static pressure connecting pipe 1 and the static pressure connecting pipe 2 inside the sampling head through the second backblowing pipe 413.

[0083] Step 4: Manually open the ball valve on the sampling tube seat. Since the pressure in the flexible sealing device 20 is greater than the pressure in the pulverized coal pipeline, the pulverized coal in the pulverized coal pipeline will not spray out from the ball valve.

[0084] Step 5: Insert the flat-head pulverized coal isokinetic sampling tube 10 into the deepest position of the pulverized coal pipeline.

[0085] Step 6: Click the "Sampling" button on the intelligent control box 40. The intelligent control box 40 communicates with the laser rangefinder, turns on the laser rangefinder, and the laser rangefinder is red at this time, and determines that the current insertion depth of the flat-head type pulverized coal isokinetic sampling tube 10 is the deepest position of the pulverized coal pipeline.

[0086] Step 7: The smart control box 40 issues a prompt tone through the speaker 418: “Please move the sampling tube outward.”

[0087] Step 8: Manually move the flat-top coal powder isokinetic sampling tube 10 outward. At the same time, the intelligent control box 40 measures the distance moved by the flat-top coal powder isokinetic sampling tube 10 through a laser rangefinder. When the flat-top coal powder isokinetic sampling tube 10 moves to a suitable position, the laser rangefinder changes from red light to green light. At the same time, the intelligent control box 40 issues a reminder sound through the speaker 418, "Start sampling at the first point, do not move the sampling tube."

[0088] Step 9: The first electromagnetic valve 405 is opened; the first bypass and servo motor 402 adjust the opening according to the command of the control system to ensure that the static pressure of the coal powder airflow is equal to the static pressure in the sampling head, thereby ensuring constant speed sampling; the capacity pump 401 is started; the second bypass and servo motor 403 adjust the opening according to the command of the control system to ensure that the pressure of the flexible sealing device is slightly higher than the pressure in the coal powder pipeline; the heating device 415 is started; the second electromagnetic valve 406 is closed; the third electromagnetic valve 407 is opened; the fourth electromagnetic valve 408 is closed; the fifth electromagnetic valve 409 is opened; the sixth electromagnetic valve 410 is opened; the seventh electromagnetic valve 411 is opened. The control system of the intelligent control box 40 will adjust the opening of the first bypass and servo motor 402 and the second bypass and servo motor 403 according to the data of each sensor, thereby ensuring constant speed sampling and the sealing of the sampling tube seat.

[0089] Step 10: After the first sampling is completed, the intelligent control box 40 issues a prompt sound through the speaker 418, "The first sampling is completed, please move the sampling tube outward." At the same time, the laser rangefinder changes from green light during sampling to red light. At the same time, the first solenoid valve 405 is closed; the first bypass and servo motor 402 still maintain the opening during sampling; the capacity pump 401 is started; the second bypass and servo motor 403 are fully closed; the heating device 415 is started; the second solenoid valve 406 is closed; the third solenoid valve 407 is opened; the fourth solenoid valve 408 is opened; the fifth solenoid valve 409 is closed; the sixth solenoid valve 410 is closed; and the seventh solenoid valve 411 is closed. The capacity pump 401 will inhale air from the atmosphere, and after heating, the hot air will be transported to the flexible sealing device 20 through the sealed air connecting pipe 4, and the hot air will be blown back to the sealed air pressure connecting pipe 3, the coal powder airflow static pressure connecting pipe 1 and the static pressure connecting pipe 2 in the sampling head through the second backblowing pipe 413.

[0090] Step 11: Manually move the flat-top coal powder isokinetic sampling tube 10 outward. At the same time, the intelligent control box 40 measures the distance moved by the flat-top coal powder isokinetic sampling tube through a laser rangefinder. When the flat-top coal powder isokinetic sampling tube 10 moves to a suitable position, the laser rangefinder changes from red light to green light. At the same time, the intelligent control box issues a reminder sound through the speaker 418, "Start sampling at the second point, do not move the sampling tube."

[0091] Then repeat steps 9, 10 and 11 to complete the sampling of the remaining sampling points.

[0092] Step 12: After the last sampling is completed, the intelligent control box 40 issues a prompt tone through the speaker 418, "All sampling is completed, please pull out the sampling tube". At the same time, the laser rangefinder is turned off. At the same time, the first solenoid valve 405 is closed; the first bypass and the servo motor 402 are fully opened; the capacity pump 401 is started; the second bypass and the servo motor 403 are fully closed; the heating device 415 is started; the second solenoid valve 406 is closed; the third solenoid valve 407 is opened; the fourth solenoid valve 408 is opened; the fifth solenoid valve 409 is closed; the sixth solenoid valve 410 is closed; and the seventh solenoid valve 411 is closed. The capacity pump 401 will inhale air from the atmosphere, and after heating, the hot air will be sent to the flexible sealing device 20 through the sealed air connecting pipe 4, and the hot air will be blown back to the sealed air pressure connecting pipe 3, the coal powder airflow static pressure connecting pipe 1 and the static pressure connecting pipe 2 in the sampling head through the second backblowing pipe 413.

[0093] Step 13: Manually pull out the flat-head pulverized coal isokinetic sampling tube 10 from the pulverized coal pipeline, and manually close the ball valve of the sampling tube seat.

[0094] Step 14: Place the flat-top coal powder isokinetic sampling tube 10 in the atmosphere and click the "suction" button on the intelligent control box 40. The first solenoid valve 405 is opened; the first bypass and the servo motor 402 are closed; the capacity pump 401 is started; the second bypass and the servo motor 403 are fully closed; the heating device 415 is started; the second solenoid valve 406 is closed; the third solenoid valve 407 is opened; the fourth solenoid valve 408 is opened; the fifth solenoid valve 409 is closed; the sixth solenoid valve 410 is closed; and the seventh solenoid valve 411 is closed. Gently tap the flat-top coal powder isokinetic sampling tube 10 and the cyclone separator 30 at the same time to suck all the coal powder samples in the pipeline into the sample collection bottle.

[0095] Step 15: Click the "End" button on the smart control box 40. The capacity pump 401 is turned off; the heating device 415 is turned off; and the smart control box 40 is turned off.

[0096] Step 16: Remove the sample collection bottle from the cyclone separator and pour the coal powder into the sampling bag. The coal powder sampling is now completed.

[0097] If it is necessary to sample pulverized coal from other pulverized coal pipelines, repeat the above steps.

[0098] It can be seen from the above technical solution that the present application provides a portable intelligent coal powder isokinetic sampling device and sampling method, which have the following advantages over the prior art:

[0099] 1. Abandoning the traditional negative pressure generator powered by compressed air, a battery-powered capacity pump is used to generate negative pressure. The negative pressure is large and can be adjusted linearly. There are no external wires and compressed air pipelines, so it has low noise, light weight and is easy to move.

[0100] Second, the sampling device of the present application is designed with a flexible sealing device, which can use the airflow at the outlet of the capacity pump as the sealing air to be transported to the flexible sealing device, thereby ensuring that the coal powder airflow in the coal powder pipeline will not be ejected from the sampling tube seat during the entire sampling process, thereby ensuring a clean and tidy sampling working environment. The exhaust gas of the sampling device is discharged into the atmosphere after being filtered, which will not cause environmental pollution.

[0101] 3. The sampling device is also equipped with a laser rangefinder, which can automatically determine the position of each sampling point. The sampling time is also controlled by the sampling device. The sampling device can automatically control the sampling flow rate according to the feedback of the sensor, thereby realizing true isokinetic sampling.

[0102] 4. The sampling device has intelligent voice prompts, and the operator only needs to operate according to the voice prompts. The sampling results are more consistent and representative.

[0103] 5. The sampling device is designed with a backflush system, which can timely backflush the pipes that are prone to blockage. The backflush gas comes from the outlet of the capacity pump, with a high pressure, and is heated by a heating device. Backflush with high-temperature gas can prevent condensation and coal powder deposition in the sampling pipeline.

[0104] Figure 6 It is a schematic diagram of an electronic device provided in an embodiment of the present application. Figure 6 The electronic device shown is a general data processing device, which includes a general computer hardware structure, which at least includes a processor 801 and a memory 802. The processor 801 and the memory 802 are connected via a bus 803. The memory 802 is suitable for storing one or more instructions or programs executable by the processor 801. The one or more instructions or programs are executed by the processor 801 to implement the steps in the above-mentioned portable intelligent coal powder isokinetic sampling method.

[0105] The processor 801 may be an independent microprocessor or a collection of one or more microprocessors. Thus, the processor 801 executes the commands stored in the memory 802 to execute the method flow of the embodiment of the present invention as described above to realize the processing of data and the control of other devices. The bus 803 connects the above-mentioned multiple components together, and at the same time connects the above-mentioned components to the display controller 804 and the display device and the input / output (I / O) device 805. The input / output (I / O) device 805 may be a mouse, a keyboard, a modem, a network interface, a touch input device, a somatosensory input device, a printer, and other devices known in the art. Typically, the input / output (I / O) device 805 is connected to the system via an input / output (I / O) controller 806.

[0106] The memory 802 may store software components such as an operating system, a communication module, an interaction module, and an application program. Each of the modules and applications described above corresponds to a set of executable program instructions that implement one or more functions and methods described in the embodiments of the invention.

[0107] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned portable intelligent coal powder isokinetic sampling method are implemented.

[0108] An embodiment of the present invention further provides a computer program product, including a computer program / instruction, which implements the steps of the above-mentioned portable intelligent coal powder isokinetic sampling method when executed by a processor.

[0109] The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. Many features and advantages of these embodiments are clear from this detailed description, and therefore the claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. In addition, since many modifications and changes are readily apparent to those skilled in the art, the embodiments of the present invention are not intended to be limited to the precise structure and operation illustrated and described, but all suitable modifications and equivalents that fall within their scope may be included.

[0110] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0111] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0112] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0113] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0114] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A portable intelligent coal powder isokinetic sampling device, characterized in that: The device includes: a flat-headed coal powder isokinetic sampling tube, a flexible sealing device, a cyclone separator and an intelligent control box. The flat-headed coal powder isokinetic sampling tube is inserted into the coal powder pipeline through a sampling tube seat. The flat-headed coal powder isokinetic sampling tube and the intelligent control box are connected through a coal powder airflow static pressure connecting tube and a sampling head internal static pressure connecting tube. One end of the flexible sealing device is sleeved on the flat-headed coal powder isokinetic sampling tube, and the other end is sleeved on the sampling tube seat. The flexible sealing device and the intelligent control box are connected through a sealed air pressure connecting tube and a sealed air connecting tube. One end of the cyclone separator is connected to the tail of the flat-headed coal powder isokinetic sampling tube, and the other end is connected to the intelligent control box through an exhaust gas connecting tube.

2. The portable intelligent coal powder isokinetic sampling device according to claim 1, characterized in that: The intelligent control box includes: a capacity pump, a first bypass and servo motor, a second bypass and servo motor, a sensor and a control system, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve and a seventh solenoid valve, wherein the first end of the first solenoid valve is connected to the exhaust gas connecting pipe, the second end of the first solenoid valve is connected to the first end of the first bypass and servo motor, the second end of the first bypass and servo motor is connected to the first end of the capacity pump, the second end of the capacity pump is connected to the first end of the second bypass and servo motor, and the second end of the second bypass and servo motor is respectively connected to the first ends of the second solenoid valve, the third solenoid valve and the fourth solenoid valve. The second end of the second solenoid valve is connected to the first end of the first solenoid valve through the first back-blowing pipe, the second end of the third solenoid valve is connected to the sealing air connecting pipe, the second end of the fourth solenoid valve is respectively connected to the sealing air pressure connecting pipe, the pulverized coal airflow static pressure connecting pipe and the sampling head internal static pressure connecting pipe, the first end of the fifth solenoid valve, the first end of the sixth solenoid valve and the first end of the seventh solenoid valve are respectively connected to the sensor and the control system, the second end of the fifth solenoid valve is connected to the sealing air pressure connecting pipe, the second end of the sixth solenoid valve is connected to the pulverized coal airflow static pressure connecting pipe, and the second end of the seventh solenoid valve is connected to the sampling head internal static pressure connecting pipe.

3. The portable intelligent coal powder isokinetic sampling device according to claim 2, characterized in that: The intelligent control box further comprises a filter device, which is connected between the second end of the first solenoid valve and the first bypass and the first end of the servo motor.

4. The portable intelligent coal powder isokinetic sampling device according to claim 2 or 3, characterized in that: The intelligent control box further includes a heating device, which is connected between the second bypass and the second end of the servo motor and the first ends of the second solenoid valve, the third solenoid valve and the fourth solenoid valve.

5. The portable intelligent coal powder isokinetic sampling device according to claim 2, characterized in that: The device also includes a laser rangefinder, which is arranged on the flat-head type coal powder isokinetic sampling tube. The laser rangefinder communicates data with the sensor and the control system through a wireless connection.

6. The portable intelligent coal powder isokinetic sampling device according to claim 1, characterized in that: The cyclone separator includes a primary separator and a secondary separator, wherein the first end of the primary separator is connected to the tail of the flat-head coal powder isokinetic sampling tube, the second end of the primary separator is connected to the first end of the secondary separator, and the second end of the secondary separator is connected to the exhaust gas connecting pipe.

7. The portable intelligent coal powder isokinetic sampling device according to claim 1, characterized in that: The main body of the flexible sealing device is made of canvas, and the overall shape is cylindrical with rubber rings at both ends. The flexible sealing device is mounted on the flat-head type coal powder isokinetic sampling tube and the sampling tube seat through the rubber ring.

8. A portable intelligent coal powder isokinetic sampling method, characterized in that: The method is performed by the portable intelligent coal powder isokinetic sampling device according to any one of claims 1 to 7, and the method comprises: Inserting a flat-headed pulverized coal isokinetic sampling tube into a pulverized coal pipeline to sample the pulverized coal, and sensing the static pressure of the pulverized coal airflow and the static pressure inside the sampling head through the flat-headed pulverized coal isokinetic sampling tube; Separating the coal powder in the sampled coal powder airflow by a cyclone separator, and collecting the separated coal powder in a sample collection bottle arranged at the bottom of the cyclone separator; The exhaust gas generated by the cyclone separator is transported to the intelligent control box through the exhaust gas connecting pipe; The intelligent control box adjusts the opening of the first bypass and the servo motor by monitoring the static pressure of the coal powder airflow and the static pressure inside the sampling head, so that the static pressure of the coal powder airflow is equal to the static pressure inside the sampling head, thereby achieving constant speed sampling; At the same time, the intelligent control box also transports the exhaust gas to the flexible sealing device and adjusts the opening of the second bypass and the servo motor so that the pressure in the flexible sealing device is greater than the pressure in the coal powder pipeline to prevent coal powder leakage.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to claim 8 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to claim 8 are implemented.

11. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method of claim 8 are implemented.

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