Anti-blocking monitoring method and system for pipeline transportation of ultrafine powder based on dilute-phase pneumatic conveying device

Abstract

The present disclosure provides an anti-blocking monitoring method and system for pipeline transportation of ultrafine powder based on a dilute-phase pneumatic conveying device. The method includes obtaining the post-valve gas transmission pressure of the gas transmission pipeline; performing gas pressure loss equalization processing on the post-valve gas transmission pressure and a preset gas transmission pressure to obtain a pressure loss equalization value; sending a blockage removal enabling signal to a dry ice blockage removal controller according to the pressure loss equalization value to adjust the working mode of a dry ice rotary valve. After collecting the post-valve gas transmission pressure, the current pipeline pneumatic conveying pressure of the gas transmission pipeline is determined, and then the post-valve gas transmission pressure is compared with the standard gas transmission pressure to facilitate determining the difference in the current pipeline internal pressure loss of the gas transmission pipeline. Finally, according to the above difference value, the dry ice rotary valve connected to the gas transmission pipeline is adjusted so that dry ice cleaning can be carried out in a timely manner when a pipeline blockage occurs, thereby improving the pipeline cleaning efficiency.

Description

Technical Field

[0001] The present disclosure relates to the technical field of dilute-phase pneumatic pipeline transportation, and particularly to an anti-blocking monitoring method and system for ultra-fine powder pipeline transportation based on a dilute-phase pneumatic conveying device. Background Art

[0002] Pneumatic conveying is an engineering technology that uses the power generated by gas flow to transport particulate or powdered materials along a pipeline. Its core mechanism is to drive the material flow by means of a high-speed air flow formed by air or an inert medium (such as nitrogen) in a closed pipeline. However, in the conveying system, powder materials are prone to deposit and adhere to the inner wall of the pipeline due to electrostatic adsorption, humidity effects, or van der Waals forces. This continuously accumulating adhesion layer will gradually form local caking. As the conveying process progresses, the subsequent flowing powder continuously collides and adheres to the caking on the pipe wall, resulting in an exponential increase in the caking volume. If the powder adhered to the pipeline is not cleaned in time, it will not only significantly reduce the material transmission efficiency, but also cause problems such as pipeline diameter shrinkage and increased air flow turbulence, and ultimately may cause the pipeline to be completely blocked, seriously affecting the stability and continuity of the system operation.

[0003] The existing ash cleaning methods for conveying pipelines are mainly as follows:

[0004] a. Regular purging method:

[0005] After shutdown, compressed air is connected, and purging is carried out step by step from the starting point of the pipeline. The residual ash is removed by the impact force of the air flow. The frequency is adjusted according to the material characteristics. For example, for easily caking materials, the purging frequency needs to be increased, but it is only applicable to short-distance purging, and the effect on stubborn accumulated ash is limited.

[0006] b. Mechanical cleaning method:

[0007] Vibrators are installed along the pipeline, and the vibration frequency is controlled by pulses. However, the noise at the site is relatively large, increasing the risk of pipeline loosening and leakage of materials.

[0008] c. Manual ash cleaning:

[0009] High-pressure water guns or pipeline disassembly are used for cleaning, but the efficiency is low, the labor intensity is high, and moreover, the shutdown time is long, affecting the production continuity. Summary of the Invention

[0010] The purpose of the present disclosure is to overcome the deficiencies in the prior art, and to provide an anti-blocking monitoring method and system for ultra-fine powder pipeline transportation based on a dilute-phase pneumatic conveying device, which can effectively improve the pipeline cleaning efficiency and reduce the pipeline cleaning cost.

[0011] The purpose of the present disclosure is achieved by the following technical solutions:

[0012] An anti-blocking monitoring method for pipeline transportation of ultra-fine powder based on a dilute-phase pneumatic conveying device, comprising: using a dilute-phase pneumatic conveying device to conduct pipeline transportation of ultra-fine powder, wherein the dilute-phase pneumatic conveying device includes: an air conveying component and a material conveying component; the air conveying component includes an air conveying pipeline, an air conveying rotary valve, a dry ice storage tank, a dry ice rotary valve, a first pressure transmitter and a second pressure transmitter, the air inlet end of the air conveying pipeline is used to communicate with a dilute-phase pneumatic conveying pump to introduce dry compressed gas, the air conveying rotary valve is communicated with the air conveying pipeline, both the first pressure transmitter and the second pressure transmitter are communicated with the air conveying pipeline, the first pressure transmitter is located between the air conveying rotary valve and the dilute-phase pneumatic conveying pump, the first pressure transmitter is located on the side of the air conveying rotary valve away from the first pressure transmitter, the dry ice storage tank is communicated with the dry ice rotary valve, the dry ice storage tank is used to store dry ice, the dry ice rotary valve is communicated with the air conveying pipeline, and the dry ice rotary valve is located on the side of the second pressure transmitter away from the air conveying rotary valve; the material conveying component includes an ultra-fine powder material sending bin and a material rotary valve which are connected in communication, the material rotary valve is communicated with the air outlet end of the air conveying pipeline, and the material rotary valve is also used to communicate with a material receiving bin;

[0013] The anti-blocking monitoring method for pipeline transportation of ultra-fine powder includes:

[0014] Obtain the post-valve air conveying pressure of the air conveying pipeline;

[0015] Perform air pressure loss leveling processing on the post-valve air conveying pressure and a preset air conveying pressure to obtain a pressure loss leveling value;

[0016] Send a clogging removal enabling signal to a dry ice clogging removal controller according to the pressure loss leveling value to adjust the working mode of the dry ice rotary valve.

[0017] In one embodiment, performing air pressure loss leveling processing on the post-valve air conveying pressure and a preset air conveying pressure includes: obtaining the pressure loss between the post-valve air conveying pressure and the preset air conveying pressure, wherein the post-valve air conveying pressure is the pressure of the second pressure transmitter, and the preset air conveying pressure is positively correlated with the pressure of the first pressure transmitter.

[0018] In one embodiment, the ratio of the preset air conveying pressure to the pressure of the first pressure transmitter is 0.7 to 0.8.

[0019] In one embodiment, a plugging removal enabling signal is sent to the dry ice plugging removal controller according to the pressure loss average value to adjust the working mode of the dry ice rotary valve, including the following steps: detecting whether the pressure loss average value is greater than or equal to 0; when the pressure loss average value is greater than or equal to 0, obtaining the pneumatic conveying flow rate of the gas transmission pipeline; detecting whether the pneumatic conveying flow rate is less than or equal to a preset conveying flow rate; when the pneumatic conveying flow rate is less than or equal to the preset conveying flow rate, sending a plugging removal enabling signal to the dry ice plugging removal controller to increase the valve opening of the dry ice rotary valve.

[0020] In one embodiment, the feeding assembly further includes an accelerator. The feeding end of the accelerator is communicated with the material rotary valve, the air inlet end of the accelerator is communicated with the gas transmission pipeline, and the discharging end of the accelerator is communicated with the material receiving bin; obtaining the pneumatic conveying flow rate of the gas transmission pipeline specifically includes: obtaining the gas transmission flow rate at the air inlet end of the accelerator.

[0021] In one embodiment, before sending a plugging removal enabling signal to the dry ice plugging removal controller to increase the valve opening of the dry ice rotary valve, it further includes: performing a spraying adjustment operation on the pressure loss average value and the pneumatic conveying flow rate to obtain the valve opening of the dry ice rotary valve and the valve opening of the gas transmission rotary valve.

[0022] In one embodiment, the valve opening of the dry ice rotary valve satisfies the following formula:

[0023]

[0024]

[0025]

[0026]

[0027]

[0028] Wherein, is the valve opening of the dry ice rotary valve, is the pressure loss error, is the flow rate error, is the pressure of the second pressure transmitter during full-load conveying, is the pressure of the second pressure transmitter when the pipeline is blocked, is the initial pressure of the first pressure transmitter when there is no material, is the current flow rate of the pneumatic conveying flow rate, is the full-load flow rate of the pneumatic conveying flow rate, represents the pressure loss error is the proportional coefficient for the opening of the dry ice rotary valve, Indicates the flow error The proportionality coefficient of the dry ice rotary valve opening Indicates the integral coefficient of the pressure loss error with respect to the dry ice rotary valve opening Indicates the differential coefficient of the pressure loss error with respect to the dry ice rotary valve opening

[0029] In one embodiment, the valve opening of the gas transmission rotary valve satisfies the following formula:

[0030]

[0031] Wherein, Indicates the pressure loss error The proportionality coefficient of the pressure loss error with respect to the gas transmission rotary valve opening Indicates the flow error The proportionality coefficient of the flow error with respect to the gas transmission rotary valve opening Indicates the integral coefficient of the pressure loss error with respect to the gas transmission rotary valve opening Indicates the differential coefficient of the pressure loss error with respect to the gas transmission rotary valve opening

[0032] In one embodiment, when the pneumatic conveying flow rate is less than or equal to the preset conveying flow rate, a clogging enabling signal is sent to the dry ice clogging controller to increase the valve opening of the dry ice rotary valve. After that, it further includes: detecting whether the valve opening of the gas transmission rotary valve is less than or equal to the preset gas transmission opening; when the valve opening of the gas transmission rotary valve is less than or equal to the preset gas transmission opening, a stop opening signal is sent to the dry ice clogging controller to close the dry ice rotary valve

[0033] An anti-clogging monitoring system for ultra-fine powder pipeline conveying, which adopts the anti-clogging monitoring method for ultra-fine powder pipeline conveying based on the dilute-phase pneumatic conveying device described in any one of the above embodiments

[0034] Compared with the prior art, the present disclosure has at least the following advantages:

[0035] After collecting the post-valve gas transmission pressure, determine the current pipeline pneumatic conveying pressure of the gas transmission pipeline, and then compare the post-valve gas transmission pressure with the standard gas transmission pressure to facilitate determining the difference in the current pipeline pressure loss of the gas transmission pipeline. Finally, according to the above difference value, adjust the dry ice rotary valve connected to the gas transmission pipeline to facilitate optimizing the working mode of the dry ice rotary valve, so that dry ice cleaning can be carried out in a timely manner when a pipeline blockage occurs, thereby improving the pipeline cleaning efficiency. Moreover, the dry ice used gasifies into carbon dioxide gas due to colliding with the pipe wall and heating up after cleaning, and can be mixed with the conveying gas in the pipeline, thus effectively reducing the pipeline cleaning cost Description of the Drawings

[0036] To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present disclosure and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 It is a flowchart of a method for preventing and monitoring blockage in the pipeline transportation of ultrafine powder based on a dilute-phase pneumatic conveying device in an embodiment.

[0038] Figure 2 It is a schematic diagram of a dilute-phase pneumatic conveying device in an embodiment. Detailed implementation manners

[0039] To facilitate the understanding of the present disclosure, the present disclosure will be described more comprehensively below with reference to the relevant accompanying drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure content of the present disclosure more thorough and comprehensive.

[0040] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present disclosure belongs. The terms used in the description of the present disclosure herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0042] The present disclosure relates to a method for monitoring and preventing blockage in the transportation of ultrafine powders through a dilute-phase pneumatic conveying device. In one embodiment, the method comprises obtaining a post-valve gas pressure in a gas pipeline; performing a pressure loss adjustment on the post-valve gas pressure and a preset gas pressure to obtain a pressure loss adjustment value; and transmitting a clearing failure signal to a dry ice clearing controller based on the pressure loss adjustment value to adjust the operating mode of a dry ice rotary valve. After collecting the gas pressure behind the valve, the current pipeline pneumatic transmission pressure of the gas pipeline is determined. Then, the gas pressure behind the valve is compared with the standard gas pressure to determine the difference in the current pressure loss in the gas pipeline. Finally, based on the above difference value, the dry ice rotary valve connected to the gas pipeline is adjusted to optimize the working mode of the dry ice rotary valve, so that dry ice cleaning can be carried out in time when the pipeline is blocked, thereby improving the pipeline cleaning efficiency. Moreover, the dry ice used will be vaporized into carbon dioxide gas due to collision with the pipe wall and heating after cleaning, which can be mixed with the conveying gas in the pipeline, thereby effectively reducing the pipeline cleaning cost.

[0043] See also Figure 1 , which is a flow chart of a method for monitoring and preventing blockage of ultrafine powder pipeline transportation based on a dilute phase pneumatic conveying device according to an embodiment of the present disclosure. The dilute phase pneumatic conveying device is used for pipeline transportation of ultrafine powder. Please refer to Figure 2 The dilute phase pneumatic conveying device includes: a gas delivery component and a material delivery component; the gas delivery component includes a gas delivery pipeline, a gas delivery rotary valve 2, a dry ice storage tank 4, a dry ice rotary valve 11, a first pressure transmitter 1 and a second pressure transmitter 3. The gas inlet end of the gas delivery pipeline is used to communicate with the dilute phase pneumatic conveying pump to introduce dry compressed gas. The gas delivery rotary valve is connected to the gas delivery pipeline. The first pressure transmitter and the second pressure transmitter are both connected to the gas delivery pipeline. The first pressure transmitter is located between the gas delivery rotary valve and the dilute phase pneumatic conveying pump. The first pressure transmitter is located on the side of the gas transmission rotary valve facing away from the first pressure transmitter. The dry ice storage tank is connected to the dry ice rotary valve and is used to store dry ice. The dry ice rotary valve is connected to the gas transmission pipeline and is located on the side of the second pressure transmitter facing away from the gas transmission rotary valve. The material feeding assembly includes an ultrafine powder material sending bin 7 and a material rotary valve 6, which are connected to the gas outlet end of the gas transmission pipeline and are also used to communicate with the material receiving bin 9. The ultrafine powder pipeline transportation anti-blocking monitoring method specifically includes some or all of the following steps.

[0044] S100: Obtain the gas transmission pressure after the valve of the gas transmission pipeline.

[0045] In this embodiment, the post-valve gas transmission pressure is the pressure inside the pipeline corresponding to the pneumatic conveying of materials in the gas transmission pipeline, that is, the post-valve gas transmission pressure is the change of the pressure inside the pipeline during gas transmission in the gas transmission pipeline, that is, the post-valve gas transmission pressure corresponds to the real-time air pressure in the gas transmission pipeline under the pneumatic conveying state. By collecting the post-valve gas transmission pressure, it is convenient to determine the current pipeline pneumatic conveying pressure of the gas transmission pipeline.

[0046] S200: Perform air pressure loss equalization processing on the post-valve gas transmission pressure and the preset gas transmission pressure to obtain an equalization value of the pressure loss.

[0047] In this embodiment, the post-valve gas transmission pressure is the pressure inside the pipeline corresponding to the pneumatic conveying of materials in the gas transmission pipeline, that is, the post-valve gas transmission pressure is the change of the pressure inside the pipeline during gas transmission in the gas transmission pipeline, that is, the post-valve gas transmission pressure corresponds to the real-time air pressure in the gas transmission pipeline under the pneumatic conveying state. By collecting the post-valve gas transmission pressure, it is convenient to determine the current pipeline pneumatic conveying pressure of the gas transmission pipeline. The preset gas transmission pressure is the standard pressure inside the pipeline corresponding to the pneumatic conveying of materials in the gas transmission pipeline, that is, the preset gas transmission pressure is the specified pressure change situation inside the pipeline during gas transmission in the gas transmission pipeline, that is, the preset gas transmission pressure corresponds to the air pressure in the gas transmission pipeline under the smooth pneumatic conveying state. By performing air pressure loss equalization processing on the post-valve gas transmission pressure and the preset gas transmission pressure, that is, calculating the equalization between the two, it is to determine the difference situation of the pressure during gas transmission inside the gas transmission pipeline, which is convenient to determine whether the current gas transmission pressure inside the gas transmission pipeline is normal, and thus convenient to determine whether there is a blockage in the material conveying during the gas transmission process inside the gas transmission pipeline. Specifically, performing air pressure loss equalization processing on the post-valve gas transmission pressure and the preset gas transmission pressure is to calculate the least square difference between the post-valve gas transmission pressure and the preset gas transmission pressure.

[0048] S300: Send a signal for unclogging failure to the dry ice unclogging controller according to the equalization value of the pressure loss to adjust the working mode of the dry ice rotary valve.

[0049] In this embodiment, the pressure loss flat value is obtained based on the post-valve gas transmission pressure and the preset gas transmission pressure. The post-valve gas transmission pressure is the pressure inside the pipeline corresponding to the pneumatic conveying of materials in the gas transmission pipeline, that is, the post-valve gas transmission pressure is the change of the pressure inside the pipeline during gas transmission in the gas transmission pipeline, and also the post-valve gas transmission pressure corresponds to the real-time air pressure in the gas transmission pipeline under the pneumatic conveying state. By collecting the post-valve gas transmission pressure, it is convenient to determine the current pipeline pneumatic conveying pressure of the gas transmission pipeline. The preset gas transmission pressure is the standard pressure inside the pipeline corresponding to the pneumatic conveying of materials in the gas transmission pipeline, that is, the preset gas transmission pressure is the specified pressure change situation inside the pipeline during gas transmission in the gas transmission pipeline, and also the preset gas transmission pressure corresponds to the air pressure in the gas transmission pipeline under the smooth pneumatic conveying state. By performing a flat difference processing on the pressure loss of the post-valve gas transmission pressure and the preset gas transmission pressure, that is, calculating the flat difference between the two, it is to determine the difference situation of the pressure during gas transmission inside the gas transmission pipeline, which is convenient to determine whether the current gas transmission pressure inside the gas transmission pipeline is normal, and thus convenient to determine whether there is a blockage in the material conveying during the gas transmission process in the gas transmission pipeline. Specifically, when performing the flat difference processing on the pressure loss of the post-valve gas transmission pressure and the preset gas transmission pressure, the least square difference between the post-valve gas transmission pressure and the preset gas transmission pressure is calculated. After obtaining the pressure loss flat value, the degree of blockage of the material conveying in the gas transmission pipeline during the gas transmission process is determined. By sending a signal for blockage removal and loss, the working mode of the dry ice rotary valve is adjusted in a timely manner, so that the dry ice rotary valve inputs the dry ice in the dry ice storage tank into the gas transmission pipeline, in order to clean the blocked material in the gas transmission pipeline in a timely manner.

[0050] In the above embodiment, after collecting the post-valve gas transmission pressure, the current pipeline pneumatic conveying pressure of the gas transmission pipeline is determined. Then, the post-valve gas transmission pressure is compared with the standard gas transmission pressure, which is convenient to determine the difference in the current pipeline pressure loss inside the gas transmission pipeline. Finally, according to the above difference value, the dry ice rotary valve connected to the gas transmission pipeline is adjusted, which is convenient to optimize the working mode of the dry ice rotary valve, so that dry ice cleaning can be carried out in a timely manner when there is a pipeline blockage, in order to improve the pipeline cleaning efficiency. Moreover, the dry ice used is vaporized into carbon dioxide gas due to the temperature rise caused by collision with the pipe wall after cleaning, and can be mixed with the conveying gas in the pipeline, thereby effectively reducing the pipeline cleaning cost.

[0051] In one embodiment, the ultrafine powder is a powder with a small particle size and a large internal friction angle. For example, its particle size is less than 10 μm and the internal friction angle is greater than 60°.

[0052] In one embodiment, the ultrafine powder is carotene powder.

[0053] In one embodiment, performing a gas transmission pressure loss equalization process on the post-valve gas transmission pressure and a preset gas transmission pressure includes: obtaining the pressure loss between the post-valve gas transmission pressure and the preset gas transmission pressure, where the post-valve gas transmission pressure is the pressure of the second pressure transmitter, and the preset gas transmission pressure is positively correlated with the pressure of the first pressure transmitter. In this embodiment, the post-valve gas transmission pressure is the pressure inside the pipeline corresponding to the pneumatic conveying of materials in the gas transmission pipeline, that is, the post-valve gas transmission pressure is the change in the pressure inside the pipeline during gas transmission in the gas transmission pipeline, that is, the post-valve gas transmission pressure corresponds to the real-time air pressure in the gas transmission pipeline under the pneumatic conveying state. By collecting the post-valve gas transmission pressure, it is convenient to determine the current pipeline pneumatic conveying pressure of the gas transmission pipeline. The preset gas transmission pressure is the standard pressure inside the pipeline corresponding to the pneumatic conveying of materials in the gas transmission pipeline, that is, the preset gas transmission pressure is the specified pressure change inside the pipeline during gas transmission in the gas transmission pipeline, that is, the preset gas transmission pressure corresponds to the air pressure in the gas transmission pipeline under the smooth pneumatic conveying state. By performing a gas transmission pressure loss equalization process on the post-valve gas transmission pressure and the preset gas transmission pressure, that is, obtaining the equalization between the two, it is to determine the difference in pressure during gas transmission inside the gas transmission pipeline, which is convenient to determine whether the current gas transmission pressure inside the gas transmission pipeline is normal, and thus convenient to determine whether there is a blockage in the material conveying during the gas transmission process inside the gas transmission pipeline. Specifically, performing a gas transmission pressure loss equalization process on the post-valve gas transmission pressure and the preset gas transmission pressure is to obtain the least squares difference between the post-valve gas transmission pressure and the preset gas transmission pressure. The gas transmission pressure loss equalization process is to obtain the pressure loss between the post-valve gas transmission pressure and the preset gas transmission pressure. The post-valve gas transmission pressure corresponds to the second pressure transmitter, and the preset gas transmission pressure corresponds to the first pressure transmitter. By calculating the pressure loss between the post-valve gas transmission pressure and the preset gas transmission pressure, it is convenient to determine the pressure loss situation of the gas transmission rotary valve during the gas transmission process in the gas transmission pipeline, and thus convenient to determine the blockage situation when the gas transmission pipeline conveys ultrafine powder.

[0054] In another embodiment, the ratio of the preset gas transmission pressure to the pressure of the first pressure transmitter is 0.7 to 0.8. Specifically, the ratio of the preset gas transmission pressure to the pressure of the first pressure transmitter is 0.75.

[0055] In one embodiment, a signal for enabling clog clearing is sent to the dry ice clog clearing controller according to the pressure loss equalization value to adjust the working mode of the dry ice rotary valve, including the following steps: detecting whether the pressure loss equalization value is greater than or equal to 0; when the pressure loss equalization value is greater than or equal to 0, obtaining the pneumatic conveying flow rate of the gas transmission pipeline; detecting whether the pneumatic conveying flow rate is less than or equal to a preset conveying flow rate; when the pneumatic conveying flow rate is less than or equal to the preset conveying flow rate, sending a signal for enabling clog clearing to the dry ice clog clearing controller to increase the valve opening of the dry ice rotary valve. In this embodiment, the pressure loss equalization value is obtained based on the post-valve gas transmission pressure and the preset gas transmission pressure. The post-valve gas transmission pressure is the pipeline internal pressure corresponding to the pneumatic conveying of materials in the gas transmission pipeline, that is, the post-valve gas transmission pressure is the change of the pipeline internal pressure during gas transmission in the gas transmission pipeline, that is, the post-valve gas transmission pressure corresponds to the real-time air pressure in the gas transmission pipeline under the pneumatic conveying state. By collecting the post-valve gas transmission pressure, it is convenient to determine the current pipeline pneumatic conveying pressure of the gas transmission pipeline. The preset gas transmission pressure is the pipeline internal standard pressure corresponding to the pneumatic conveying of materials in the gas transmission pipeline, that is, the preset gas transmission pressure is the specified pressure change in the pipeline during gas transmission in the gas transmission pipeline, that is, the preset gas transmission pressure corresponds to the air pressure in the gas transmission pipeline under the smooth pneumatic conveying state. By performing a pressure loss equalization process on the post-valve gas transmission pressure and the preset gas transmission pressure, that is, calculating the difference between the two, the difference in pressure during gas transmission in the gas transmission pipeline is determined, which is convenient to determine whether the current gas transmission pressure in the gas transmission pipeline is normal, and thus convenient to determine whether there is a blockage in the material conveying process in the gas transmission pipeline. Specifically, the pressure loss equalization process of the post-valve gas transmission pressure and the preset gas transmission pressure is to calculate the least square difference between the post-valve gas transmission pressure and the preset gas transmission pressure. After obtaining the pressure loss equalization value, the degree of material conveying blockage in the gas transmission pipeline during the gas transmission process is determined. By sending a signal for disabling clog clearing, the working mode of the dry ice rotary valve is adjusted in a timely manner, so that the dry ice rotary valve inputs the dry ice in the dry ice storage tank into the gas transmission pipeline, so as to facilitate the timely cleaning of the blocked materials in the gas transmission pipeline. The pressure loss equalization value being greater than or equal to 0 indicates that the pressure of the second pressure transmitter is too high, that is, it indicates that the pressure loss between the rear end pressure and the front end pressure of the gas transmission rotary valve is too large, and at this time, there will be a accumulation of ultra-fine powder in the gas transmission pipeline. And for whether there is a blockage problem affecting material conveying, it is determined by the pneumatic conveying flow rate of the gas transmission pipeline.The feeding component further includes an accelerator. The feeding end of the accelerator is communicated with the material rotary valve, the air inlet end of the accelerator is communicated with the air conveying pipeline, and the discharging end of the accelerator is communicated with the material receiving bin. The pneumatic conveying flow rate is the air conveying flow rate at the air inlet end of the accelerator, that is, the pneumatic conveying flow rate is the gas flow rate at the air conveying and material feeding docking position in the air conveying pipeline. The preset conveying flow rate is the standard air conveying flow rate in the air conveying pipeline, that is, the preset conveying flow rate corresponds to the air conveying flow rate of the dilute-phase pneumatic conveying pump when fully loaded with ultra-fine powder materials. Specifically, the preset conveying flow rate is 0.8 times the air conveying flow rate of the dilute-phase pneumatic conveying pump when fully loaded with ultra-fine powder materials. When the pneumatic conveying flow rate is less than or equal to the preset conveying flow rate, it indicates that the air conveying flow rate in the air conveying pipeline has decreased, that is, it indicates that ultra-fine powder materials have accumulated and blocked the pipeline in the air conveying pipeline. At this time, a blockage clearing enable signal is sent to the dry ice blockage clearing controller to increase the valve opening of the dry ice rotary valve, so that the dry ice rotary valve starts to work. Specifically, when the pneumatic conveying flow rate decreases to 0.8 times the air conveying flow rate of the dilute-phase pneumatic conveying pump when fully loaded with ultra-fine powder materials, the valve opening of the dry ice rotary valve changes from 0 to greater than 0, that is, the dry ice rotary valve opens. For the situation where the air conveying flow rate is less than 0.8 times the air conveying flow rate of the dilute-phase pneumatic conveying pump when fully loaded with ultra-fine powder materials, the valve opening of the dry ice rotary valve is correspondingly increased to facilitate timely cleaning of the blockage in the air conveying pipeline.

[0056] In one embodiment, before sending a blockage clearing enable signal to the dry ice blockage clearing controller to increase the valve opening of the dry ice rotary valve, it further includes: performing a spraying adjustment operation on the pressure loss average value and the pneumatic conveying flow rate to obtain the valve opening of the dry ice rotary valve and the valve opening of the air conveying rotary valve. In this embodiment, the dry ice rotary valve is used as the valve for clearing blockages in the air conveying pipeline to timely convey the dry ice in the dry ice storage tank into the air conveying pipeline. Through the collision between the dry ice and the ultra-fine powder accumulated on the inner wall of the air conveying pipeline, the accumulated ultra-fine powder is removed. The air conveying rotary valve is used as the switching valve of the dilute-phase pneumatic conveying pump. A first pressure transmitter and a second pressure transmitter are respectively arranged at the front and rear ends of the air conveying rotary valve. The rear end of the air conveying rotary valve is associated with the ultra-fine powder material conveying, so that there is a pressure difference between the first pressure transmitter and the second pressure transmitter during the ultra-fine powder material conveying. The valve opening of the dry ice rotary valve determines the degree of clearing of the blockage in the air conveying pipeline, and the valve opening of the air conveying rotary valve determines the conveying load degree of the dilute-phase pneumatic conveying pump for ultra-fine powder.

[0057] In one embodiment, the valve opening of the dry ice rotary valve satisfies the following formula:

[0058]

[0059]

[0060]

[0061]

[0062]

[0063] Among them, is the valve opening of the dry ice rotary valve, is the pressure loss error, is the flow rate error, is the pressure of the second pressure transmitter during full-load transportation, is the pressure of the second pressure transmitter when the pipeline is blocked, is the initial pressure of the first pressure transmitter when there is no material, is the current flow rate of the pneumatic conveying flow rate, is the full-load flow rate of the pneumatic conveying flow rate, represents the pressure loss error for the proportional coefficient of the dry ice rotary valve opening, represents the flow rate error for the proportional coefficient of the dry ice rotary valve opening, represents the integral coefficient of the pressure loss error with respect to the dry ice rotary valve opening, represents the differential coefficient of the pressure loss error with respect to the dry ice rotary valve opening.

[0064] In this embodiment, the pneumatic conveying flow rate serves as the dominant input compensation input for the valve opening of the dry ice rotary valve. Specifically, the flow rate error is the difference between the pneumatic conveying flow rate and the preset conveying flow rate to determine whether there is a decrease in the conveying efficiency of the gas transmission pipeline, and the pressure loss average value serves as the valve opening compensation input for the dry ice rotary valve. Specifically, the pressure loss error is the pressure loss average value to determine whether the conveying is restricted due to blockage in the gas transmission pipeline and decide whether to perform dry ice injection cleaning.

[0065] In one of the embodiments, the valve opening of the gas transmission rotary valve satisfies the following formula:

[0066]

[0067] Among them, represents the pressure loss error for the proportional coefficient of the gas transmission rotary valve opening, represents the flow rate error for the proportional coefficient of the gas transmission rotary valve opening, represents the integral coefficient of the pressure loss error with respect to the gas transmission rotary valve opening, Represents the differential coefficient of the pressure loss error with respect to the opening of the gas transmission rotary valve.

[0068] In this embodiment, the pressure loss average value serves as the main input for the valve opening of the gas transmission rotary valve to reflect the resistance situation in the gas transmission pipeline. Specifically, the pressure loss error is the pressure loss average value, and the pneumatic conveying flow rate serves as the compensation input. Specifically, the flow rate error is the difference between the pneumatic conveying flow rate and the preset conveying flow rate, which is used to improve the accuracy and robustness of the control response of the gas transmission rotary valve.

[0069] In another embodiment, the opening range of each valve is from 0 to 1.

[0070] Furthermore, when the pneumatic conveying flow rate is less than or equal to the preset conveying flow rate, a clogging removal enable signal is sent to the dry ice clogging removal controller to increase the valve opening of the dry ice rotary valve. After that, it further includes: detecting whether the valve opening of the gas transmission rotary valve is less than or equal to the preset gas transmission opening; when the valve opening of the gas transmission rotary valve is less than or equal to the preset gas transmission opening, a stop opening signal is sent to the dry ice clogging removal controller to close the dry ice rotary valve. In this embodiment, the gas transmission rotary valve serves as the main control valve for dilute-phase pneumatic conveying in the gas transmission pipeline, and the dry ice rotary valve is located behind the gas transmission rotary valve. The adjustment of the valve opening of the dry ice rotary valve is directly affected by the gas transmission rotary valve. The valve opening of the gas transmission rotary valve serves as an index for converting the real-time gas conveying flow rate and pressure of the gas transmission rotary valve, that is, the valve opening of the gas transmission rotary valve is a quantization index of the opening degree of the gas transmission rotary valve. The preset gas transmission opening serves as the standard opening of the gas transmission rotary valve. For example, the preset gas transmission opening is the basic opening corresponding to the gas transmission rotary valve when the inside of the gas transmission pipeline is clean and there is no ultrafine powder flowing. At this time, the dilute-phase pneumatic conveying pump is normally performing pneumatic conveying. Specifically, the preset gas transmission opening is 0.5.

[0071] In this way, when the valve opening of the gas transmission rotary valve is less than or equal to the preset gas transmission opening, it indicates that the opening degree of the gas transmission rotary valve is at the basic opening and below, that is, it indicates that the gas transmission pipeline is currently in the negative pressure recovery stage. At this time, a stop opening signal is sent to the dry ice clogging removal controller to close the dry ice rotary valve, so that the gas transmission rotary valve gradually rises to the basic opening in a linear callback manner, thereby gradually adjusting the gas transmission rotary valve to the initial state. Moreover, at this time, the accumulation of ultrafine powder in the gas transmission pipeline has been cleared, and the dry ice rotary valve is closed to avoid excessive consumption of dry ice.

[0072] In another embodiment, when the valve opening of the gas transmission rotary valve is less than or equal to the preset gas transmission opening, the pressure corresponding to the second pressure transmitter returns to the range of 45% to 55% of the pressure of the first pressure transmitter, that is , and at this time, the pneumatic conveying flow rate recovers to more than 80% of the flow rate under the full load state, that is .

[0073] In another embodiment, the specific steps of the anti-blocking monitoring method for ultra-fine powder pipeline conveying based on the dilute-phase pneumatic conveying device are as follows:

[0074] Step S1: Arrange sensors at key positions of the pipeline, including:

[0075] The first pressure transmitter , the second pressure transmitter : Monitor the pipeline pressure.

[0076] The flow sensor : Monitor the inlet flow rate of the pneumatic conveying pipeline, that is, the gas transmission flow rate at the air inlet end of the accelerator.

[0077] The gas transmission rotary valve sensor , the material rotary valve sensor , the dry ice rotary valve sensor : Monitor the valve opening of the rotary valve, with a range of 0 to 1.

[0078] The weighing sensor : Measure the material conveying weight of the ultra-fine powder material sending bin.

[0079] Step S2: Data acquisition and processing

[0080] The sensors collect data in real time, including pressure, flow rate, temperature, etc. The data is uploaded to the central control system and filtered and anomaly detected. The initial pressures of the first pressure transmitter and the second pressure transmitter are respectively denoted as , . The initial flow rate is denoted as , set the opening of the gas transmission rotary valve = 0.5 as the reference measurement state, the initial opening of the material rotary valve is = 0, and the initial opening of the dry ice rotary valve is = 0.

[0081] Step S3: Pipeline cleaning condition determination

[0082] Calculate the pressure loss of the gas transmission pipeline when the conveying load is 0 as ; Gradually open , until the change value of the weighing module is consistent with the expected conveying capacity, that is When, the full-load conveying pressure loss is , the flow velocity at full load transportation is denoted as . After full load transportation for a period of time, the conveying pipe diameter of the gas transmission pipeline becomes smaller due to the accumulation of ultrafine powder, decreases, increases, increases. To maintain full load transportation, the system automatically increases . At this time, it is judged whether the cleaning mode needs to be triggered according to the following conditions:

[0083] When ;

[0084] ;

[0085] When

[0086] Step S4: PID control adjusts the injection parameters

[0087] (1) Error calculation:

[0088] a. Pressure loss error: .

[0089] Among them, , is the ③ pressure value after pipeline blockage, is the corresponding pipeline pressure loss, is the error between the current pressure loss and the full load pressure loss.

[0090] b. Flow rate error: .

[0091] Among them, is the current pneumatic conveying flow rate, is the full load reference flow rate.

[0092] Combined PID control calculation:

[0093] In the control system, the gas transmission rotary valve takes the pressure loss error as the main input to reflect the pipeline resistance situation; the flow rate error is used as a supplementary signal to improve the accuracy and robustness of the control response. The dry ice rotary valve takes the flow rate error as the main input to judge whether there is a decrease in the conveying efficiency of the pipeline, and at the same time combines the pressure loss error to judge whether the conveying is restricted due to blockage, and decides whether to perform dry ice injection cleaning.

[0094] Therefore, the valve opening of the gas transmission rotary valve and the valve opening of the dry ice rotary valve, the PID control formula is designed as follows:

[0095]

[0096]

[0097] Among them, represents the pressure loss error (unit: Pa) for the proportional coefficient of the opening (unit: % / Pa), represents the flow error (unit: kg / s) for the proportional coefficient of the opening (unit: % / (kg / s)); represents the integral coefficient of the pressure loss error with respect to the opening (unit: % / (Pa·s)), represents the differential coefficient of the pressure loss error with respect to the opening (unit: %·s / Pa), , , , Similarly.

[0098] Step S5: Real-time feedback and optimization

[0099] This step is used to dynamically adjust the control parameters through sensor data feedback during and after the cleaning execution to ensure continuous optimization of the cleaning effect and system operation efficiency.

[0100] Monitoring the cleaning effect

[0101] The system continuously records the changes in the second pressure transmitter and the flow rate of the gas transmission pipeline before and after dry ice injection. According to the cleaning determination conditions:

[0102] (1) Return to the range of 45% - 55% of the first pressure transmitter (reference range), that is ;

[0103] (2) The conveying flow rate returns to more than 80% of the flow rate under full load conditions, that is .

[0104] When the cleaning meets any of the above conditions, the control system first determines whether the current opening of the gas transmission rotary valve has reached the basic opening of 0.5:

[0105] ① If is greater than 0.5, it means that the gas transmission rotary valve is still in the enhanced state. At this time, the control system slowly adjusts in a linearly retracting manner. When = 0.5, the dry ice rotary valve is closed.

[0106] ② If Less than 0.5, indicating that the current is in the negative pressure recovery stage, at this time the system gradually increases in a linear callback manner to 0.5, when = 0.5, close the dry ice rotary valve.

[0107] ③ If = 0.5, close the dry ice rotary valve.

[0108] Continuously optimize the PID parameters

[0109] Based on the error change situation, the system dynamically adjusts the PID controller parameters, specifically including:

[0110] Error-driven adjustment mechanism

[0111] If the pressure loss difference deviates from the target value for a long time, or the flow error persists, the system will automatically adjust:

[0112] Parameters of the gas transmission rotary valve controller: 、 、 ;

[0113] Parameters of the dry ice rotary valve controller: 、 、

[0114] Adaptive control mechanism design

[0115] By introducing an adaptive control strategy, the system dynamically adjusts the PID controller parameters according to the actual operating conditions, thereby improving the system response. The adaptive strategy includes the following logic:

[0116] When the pressure error or flow error fluctuates violently, the system automatically increases the proportional gain , to improve the response speed;

[0117] If the error fluctuates beyond the set threshold for a long time, the system reduces the integral and differential coefficients 、 , to suppress oscillations and prevent over-adjustment;

[0118] When the pipeline resistance is too large or too small, the system adjusts the controller parameters according to the change trend of the pressure drop and flow velocity to achieve precise adjustment.

[0119] Adaptive control based on gain scheduling

[0120] Gain scheduling is a simple and efficient adaptive control strategy, and the specific process is as follows:

[0121] System state recognition mechanism

[0122] Based on the pressure and flow data collected by the sensor, the system divides the operating state into three types:

[0123] - Normal transportation state:

[0124]

[0125]

[0126] - Blockage intensification state:

[0127]

[0128]

[0129]

[0130] - Cleaning and recovery state:

[0131]

[0132]

[0133] PID parameter switching strategy

[0134] A set of PID parameter groups for the gas transmission rotary valve and the dry ice rotary valve are preset for the above three states. The system automatically switches the corresponding parameter groups according to the state without manual intervention, and combines the combined error for scheduling control to achieve clean and optimized operation under all working conditions, as shown in Table 1 below:

[0135] Table 1

[0136]

[0137] "↑" means to appropriately increase, "↓" means to appropriately decrease, and "—" means the normal value.

[0138] Step S6: Completion of cleaning and exit

[0139] When and return to normal, the system ends the cleaning. Record all cleaning data for subsequent optimization. According to the feedback of the cleaning data, continue to adjust the parameter optimization strategy of the adaptive control to ensure that the system always maintains high efficiency and stability during different cleaning processes.

[0140] In one embodiment, the present disclosure also relates to an anti-blocking monitoring system for ultra-fine powder pipeline transportation, which adopts the anti-blocking monitoring method for ultra-fine powder pipeline transportation based on the dilute-phase pneumatic conveying device described in any of the above embodiments. In this embodiment, the anti-blocking monitoring method for ultra-fine powder pipeline transportation includes: obtaining the post-valve gas transmission pressure of the gas transmission pipeline; performing a pressure loss leveling difference process on the post-valve gas transmission pressure and a preset gas transmission pressure to obtain a pressure loss leveling difference value; sending a signal to enable anti-blocking to the dry ice anti-blocking controller according to the pressure loss leveling difference value to adjust the working mode of the dry ice rotary valve. After collecting the post-valve gas transmission pressure, determine the current pipeline pneumatic conveying pressure of the gas transmission pipeline, and then compare the post-valve gas transmission pressure with the standard gas transmission pressure to facilitate determining the difference in the current pipeline internal pressure loss of the gas transmission pipeline. Finally, according to the above difference value, adjust the dry ice rotary valve connected to the gas transmission pipeline to optimize the working mode of the dry ice rotary valve, so that dry ice cleaning can be carried out in a timely manner when the pipeline is blocked, thereby improving the pipeline cleaning efficiency. Moreover, the dry ice used is vaporized into carbon dioxide gas due to the temperature rise after colliding with the pipe wall during cleaning, and can be mixed with the conveying gas in the pipeline, thereby effectively reducing the pipeline cleaning cost.

[0141] The above-described embodiments merely represent several implementation manners of the present disclosure, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several modifications and improvements can still be made, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent shall be subject to the appended claims.

Claims

1. A method for preventing blockage and monitoring the pipeline transportation of ultrafine powder based on a dilute-phase pneumatic conveying device, characterized in that include: The ultrafine powder is transported through a pipeline using a dilute phase pneumatic conveying device, the dilute phase pneumatic conveying device comprising: A gas delivery assembly, comprising a gas delivery pipeline, a gas delivery rotary valve, a dry ice storage tank, a dry ice rotary valve, a first pressure transmitter, and a second pressure transmitter; the gas inlet end of the gas delivery pipeline is used to communicate with a dilute phase pneumatic conveying pump to introduce dry compressed gas; the gas delivery rotary valve is in communication with the gas delivery pipeline; the first pressure transmitter and the second pressure transmitter are both in communication with the gas delivery pipeline; the first pressure transmitter is located between the gas delivery rotary valve and the dilute phase pneumatic conveying pump; the second pressure transmitter is located on a side of the gas delivery rotary valve facing away from the first pressure transmitter; the dry ice storage tank is in communication with the dry ice rotary valve, and is used to store dry ice; the dry ice rotary valve is in communication with the gas delivery pipeline; and the dry ice rotary valve is located on a side of the second pressure transmitter facing away from the gas delivery rotary valve; A material feeding assembly, comprising an ultrafine powder material sending bin and a material rotary valve connected to each other, the material rotary valve being connected to the gas outlet end of the gas pipeline and further connected to the material receiving bin; The anti-blocking monitoring method for ultrafine powder pipeline transportation comprises: Obtain the gas pressure after the valve of the gas pipeline; Performing gas pressure loss adjustment processing on the gas transmission pressure after the valve and the preset gas transmission pressure to obtain a pressure loss adjustment value; Sending a clearing failure signal to the dry ice clearing controller according to the pressure loss adjustment value to adjust the working mode of the dry ice rotary valve; The method includes sending a clearing failure signal to the dry ice clearing controller according to the pressure loss adjustment value to adjust the working mode of the dry ice rotary valve, and comprising the following steps: Detecting whether the pressure loss adjustment value is greater than or equal to 0; When the pressure loss adjustment value is greater than or equal to 0, obtaining the pneumatic conveying flow rate of the gas pipeline; Detecting whether the pneumatic conveying flow rate is less than or equal to a preset conveying flow rate; When the pneumatic conveying flow rate is less than or equal to the preset conveying flow rate, sending a clearing enable signal to the dry ice clearing controller to increase the valve opening of the dry ice rotary valve; Sending a clearing enable signal to the dry ice clearing controller to increase the valve opening of the dry ice rotary valve, the method also includes: Performing a spray adjustment operation on the pressure loss adjustment value and the pneumatic conveying flow rate to obtain the valve opening of the dry ice rotary valve and the valve opening of the gas transmission rotary valve; And, the valve opening of the dry ice rotary valve satisfies the following formula: Among them, is the valve opening of the dry ice rotary valve, is the pressure loss error, is the flow rate error, is the pressure of the second pressure transmitter during full-load conveying, is the pressure of the second pressure transmitter when the pipeline is blocked, is the initial pressure of the first pressure transmitter when there is no material, is the current flow rate of the pneumatic conveying flow rate, is the full-load flow rate of the pneumatic conveying flow rate, represents the pressure loss error is the proportional coefficient of the pressure loss error with respect to the opening of the dry ice rotary valve, represents the flow rate error is the proportional coefficient of the flow rate error with respect to the opening of the dry ice rotary valve, is the integral coefficient of the pressure loss error with respect to the opening of the dry ice rotary valve, is the differential coefficient of the pressure loss error with respect to the opening of the dry ice rotary valve.

2. The anti-blocking monitoring method for ultra-fine powder pipeline transportation based on a dilute-phase pneumatic conveying device according to claim 1, characterized in that, Performing gas pressure loss adjustment processing on the gas transmission pressure after the valve and the preset gas transmission pressure, including: The pressure loss between the post-valve gas supply pressure and the preset gas supply pressure is calculated, wherein the post-valve gas supply pressure is the pressure of the second pressure transmitter, and the preset gas supply pressure is positively correlated with the pressure of the first pressure transmitter.

3. The anti-blocking monitoring method for ultra-fine powder pipeline transportation based on a dilute-phase pneumatic conveying device according to claim 2, wherein, The ratio of the preset gas delivery pressure to the pressure of the first pressure transmitter is 0.7 to 0.

8.

4. The anti-blocking monitoring method for pipeline transportation of ultrafine powder based on dilute-phase pneumatic conveying device according to claim 1, characterized in that, The material delivery assembly further includes an accelerator, wherein the feed end of the accelerator is connected to the material rotary valve, the air inlet end of the accelerator is connected to the air delivery pipeline, and the discharge end of the accelerator is connected to the material receiving bin; Obtain the pneumatic conveying flow rate of the gas transmission pipeline, specifically: Obtain the gas transmission flow rate at the air inlet end of the accelerator.

5. The anti-blocking monitoring method for ultra-fine powder pipeline transportation based on a dilute-phase pneumatic conveying device according to claim 1, characterized in that The valve opening of the gas transmission rotary valve satisfies the following formula: Among them, represents the pressure loss error and is the proportional coefficient of the opening of the gas transmission rotary valve, represents the flow rate errorand is the proportional coefficient of the opening of the gas transmission rotary valve, represents the integral coefficient of the pressure loss error with respect to the opening of the gas transmission rotary valve,represents the differential coefficient of the pressure loss error with respect to the opening of the gas transmission rotary valve.

6. The anti-blocking monitoring method for ultra-fine powder pipeline transportation based on a dilute-phase pneumatic conveying device according to claim 5, characterized in that, When the pneumatic conveying flow rate is less than or equal to the preset conveying flow rate, send a clog clearing enable signal to the dry ice clog clearing controller to increase the valve opening of the dry ice rotary valve. After that, it further includes: Detect whether the valve opening of the gas transmission rotary valve is less than or equal to the preset gas transmission opening; When the valve opening of the gas transmission rotary valve is less than or equal to the preset gas transmission opening, send a stop opening signal to the dry ice clog clearing controller to close the dry ice rotary valve.

7. An anti-clogging monitoring system for ultra-fine powder pipeline transportation, which adopts the anti-clogging monitoring method for ultra-fine powder pipeline transportation based on the dilute-phase pneumatic conveying device as described in any one of claims 1 to 6.

Images