Coal-fired boiler air volume measuring device

Abstract

The invention provides a coal-fired boiler air volume measuring device, and relates to the technical field of air volume measuring devices, and the device comprises a flow equalizing module which is used for carrying out flow equalizing on air in a secondary air horizontal pipeline; the collecting and measuring module is used for collecting and measuring the air volume of air in the secondary air horizontal pipeline; the blockage detection module is used for monitoring the blockage condition of the acquisition and measurement module; and the dredging execution module is used for dredging the acquisition and measurement module when the acquisition and measurement module is blocked. Through cooperative work of the flow equalizing module, the collection and measurement module, the blockage detection module and the dredging execution module, the secondary air volume of the coal-fired boiler can be effectively measured, meanwhile, the blockage condition of the collection and measurement module can be monitored in real time, dredging can be conducted in time, the continuity and stability of air volume measurement are guaranteed, and the working efficiency is improved. Measurement interruption or inaccurate data caused by blockage is avoided, and the reliability and practicability of the whole device are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wind measurement devices, and particularly relates to a coal-fired boiler wind measurement device. BACKGROUND

[0002] The coal-fired boiler wind measurement device is a key equipment for monitoring and metering the wind volume in the operation process of a coal-fired boiler system, and mainly serves to acquire the flow information of the air flow of the secondary air of the boiler in real time and provide important data support for the combustion regulation of the boiler. In the working process of the coal-fired boiler, appropriate wind volume is an important prerequisite for ensuring full combustion of fuel, improving combustion efficiency and reducing pollutant emission. Therefore, the accuracy and stability of the wind measurement device are directly related to the operation efficiency, energy consumption level and environmental protection performance of the boiler, and the wind measurement device is an indispensable component for safe, economic and environmentally friendly operation of the coal-fired boiler.

[0003] The existing coal-fired boiler wind measurement device has many technical problems in actual application. For example, some devices lack effective flow equalization structures, which leads to uneven distribution of air flow in the secondary air horizontal pipeline, and further affects the accuracy of wind volume collection. The collection and measurement module is often blocked by dust and other impurities in the air flow, and lacks a mechanism for real-time monitoring of the blocking condition, often requiring regular manual inspection, which not only increases maintenance costs, but also may lead to distorted measurement data or interrupted measurement due to failure to discover the blockage in time. At the same time, for the unblocking of the blockage, the existing device relies on manual operation, which is low in unblocking efficiency and poor in unblocking effect, and is difficult to realize automatic, timely and effective unblocking. These problems together lead to the need to improve the reliability and practicality of the existing wind measurement device. SUMMARY

[0004] The present application provides a coal-fired boiler wind measurement device to solve at least one of the above technical problems.

[0005] To solve the above technical problems, the present application discloses a coal-fired boiler wind measurement device, comprising:

[0006] A flow equalization module for equalizing the flow of the wind in the secondary air horizontal pipeline;

[0007] A collection and measurement module for collecting and measuring the wind volume of the wind in the secondary air horizontal pipeline;

[0008] A blockage detection module for monitoring the blockage condition of the collection and measurement module;

[0009] An unblocking execution module for unblocking the collection and measurement module when the collection and measurement module is blocked.

[0010] Preferably, the flow equalization module comprises a flow equalization grid installed in the secondary air horizontal pipeline, the flow equalization grid comprises a plurality of horizontally arranged horizontal grids and a plurality of vertically arranged vertical grids, the horizontal grids and the vertical grids are arranged perpendicularly and cross each other, the horizontal grids are provided with a plurality of longitudinal flow equalization holes, and the vertical grids are provided with a plurality of transverse flow equalization holes.

[0011] Preferably, the collection and measurement module comprises a plurality of main sampling pipes, the main sampling pipes are connected with a plurality of sampling branch pipes, and the sampling branch pipes are provided with air volume sensors.

[0012] Preferably, the blockage detection module comprises:

[0013] The air volume transfer sub-module is used for transferring the secondary air collected by the plurality of sampling branch pipes to the blockage detection box and filtering the air through the self-cleaning filter screen.

[0014] The image collection sub-module is used for collecting images of each angle of the self-cleaning filter screen at each time point to obtain a plurality of self-cleaning filter screen collection images collected at each time point.

[0015] The blockage analysis sub-module is used for analyzing the image data collected by the image collection sub-module to obtain a to-be-unblocked coefficient of the collection and measurement module and controlling the unblocking execution module to work based on the to-be-unblocked coefficient.

[0016] Preferably, the detection conveying pipe and the return pipe are respectively provided with a check valve one and a check valve two.

[0017] Preferably, the air volume transfer sub-module comprises an arc-shaped transfer block, the arc-shaped transfer block is provided with a transfer cavity, the transfer cavity is communicated with the detection conveying pipe, one end of the detection conveying pipe away from the transfer cavity is communicated with the blockage detection box, the blockage detection box is provided with a self-cleaning filter screen, the self-cleaning filter screen divides the blockage detection box into a cooling cavity and an image collection cavity, the image collection cavity is communicated with the secondary air horizontal pipeline through the return pipe, and the cooling cavity is provided with a refrigerator.

[0018] The image collection sub-module comprises an image collector, and the image collector is used for collecting images of the self-cleaning filter screen.

[0019] Preferably, the blockage analysis sub-module comprises:

[0020] The auxiliary pixel determination unit is used for obtaining a pixel value of each pixel point in the self-cleaning filter screen collection image collected at each time point and calculating a pixel mean value of adjacent pixel points corresponding to each pixel point of each self-cleaning filter screen collection image as an auxiliary pixel of the pixel point of the self-cleaning filter screen collection image.

[0021] The filter screen background acquisition unit is configured to calculate the sum of the auxiliary pixels of the corresponding pixel points on a plurality of self-cleaning filter screen acquisition images collected at each time, and take the quotient of the sum of the auxiliary pixels of the corresponding pixel points on the self-cleaning filter screen acquisition images and the total number of the self-cleaning filter screen acquisition images collected at each time as the filter screen background pixel value of the pixel point, and take the image composed of the filter screen background pixel values of each pixel point as the filter screen background image.

[0022] The dust deposition area determination unit selects an image with the highest definition from the plurality of self-cleaning filter screen acquisition images as an evaluation image, calculates the absolute value of the difference between the actual pixel value of each pixel point in the evaluation image and the filter screen background pixel value thereof, and marks the pixel point as a dust deposition area pixel point when the absolute value of the difference between the actual pixel value of the pixel point and the filter screen background pixel value thereof is greater than a preset pixel difference value. The area composed of all the dust deposition area pixel points is the dust deposition area, and the remaining area is the non-dust deposition area.

[0023] The unit for calculating the coefficient to be dredged is configured to count the dust deposition area, and calculate the coefficient to be dredged of the collection and measurement module based on the dust deposition area.

[0024] The dredging determination unit sends a dredging signal to the dredging execution module when the coefficient to be dredged of the collection and measurement module is greater than a preset coefficient to be dredged of the collection and measurement module.

[0025] Preferably, the coefficient to be dredged of the collection and measurement module is calculated based on the dust deposition area:

[0026] wherein W is the coefficient to be dredged of the collection and measurement module, a is a dust deposition area error compensation coefficient, S is the real-time area of the dust deposition area of the evaluation image, and S0 is the real-time area of the non-dust deposition area. x

[0027] Preferably, the dredging execution module comprises:

[0028] The air compressor is arranged on the arc-shaped transfer block and communicates with the arc-shaped transfer block at the outlet end, and the air compressor outlet end is provided with a flow control valve.

[0029] The dredging cooperation switch group comprises a plurality of electrically closed switches and a bottom knob switch. The electrically closed switches are connected to the inside of the main sampling pipe in a sliding manner and are used to control the on-off of the sampling branch pipe. The bottom knob switch is installed at the lower part of the main sampling pipe. A plurality of on-off driving assemblies are arranged on the secondary air horizontal pipeline, and the on-off driving assemblies are used to control the on-off of the main sampling pipe.

[0030] The on-off driving assembly comprises a micro motor and a driving gear. The micro motor is fixedly connected to the outer wall of the secondary air horizontal pipeline, and the driving gear is fixedly connected to the output end of the micro motor. The driving gear is in meshing engagement with the side wall of the bottom knob switch.​

[0031] Preferably, the device further comprises a dust collection assembly, the dust collection assembly comprising an arc-shaped dust collection box arranged on the secondary air horizontal pipeline, and the arc-shaped dust collection box is used for collecting dust generated in the dredging process of the collection and measurement module.

[0032] Compared with the prior art, the device has the following beneficial effects:

[0033] By arranging the flow equalization module, the device can equalize the flow in the secondary air horizontal pipeline, solves the problem that the flow distribution is uneven and the accuracy of the air volume collection is affected due to the lack of an effective flow equalization structure in the prior device, by arranging the collection and measurement module, the device can collect and measure the air volume of the equalized secondary air, and provide reliable data for the boiler combustion regulation and control, by arranging the blockage detection module, the device can monitor the blockage condition of the collection and measurement module in real time, avoids the problem that the prior device relies on manual regular inspection of blockage, has high maintenance cost, and the measurement data may be distorted or interrupted due to the blockage not being found in time, by arranging the dredging execution module, the device can dredge in time when the collection and measurement module is blocked, overcomes the defects that the prior device relies on manual dredging, has low efficiency and poor effect, realizes automatic dredging, and improves the reliability, practicality, accuracy and stability of the air volume measurement of the device, and better meets the needs of safe, economic and environmentally-friendly operation of the coal-fired boiler. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, illustrate the application, and are used together with the embodiments to explain the application, and do not constitute a limitation on the application. In the drawings:

[0035] Figure 1 It is a schematic view of the overall structure of the coal-fired boiler air volume measurement device of the application;

[0036] Figure 2 It is a schematic view of the overall structure of the coal-fired boiler air volume measurement device of the application; Figure 1

[0037] Figure 3 It is a schematic view of the overall structure of the coal-fired boiler air volume measurement device of the application; Figure 1

[0038] Figure 4 It is a schematic view of the overall structure of the coal-fired boiler air volume measurement device of the application; Figure 1

[0039] Figure 5 It is a schematic view of the overall structure of the coal-fired boiler air volume measurement device of the application; Figure 1

[0040] Figure 6 It is a schematic view of the overall structure of the coal-fired boiler air volume measurement device of the application; Figure 1

[0041] ​​​​​In the figure: 1, secondary air horizontal pipeline; 2, flow uniformity grid; 20, horizontal grid; 21, vertical grid; 22, longitudinal flow uniformity hole; 23, transverse flow uniformity hole; 3, main sampling pipe; 30, sampling branch pipe; 31, air volume sensor; 4, arc-shaped transfer block; 40, transfer cavity; 41, detection conveying pipe; 410, check valve one; 411, check valve two; 42, blockage detection box; 43, self-cleaning filter screen; 44, cooling cavity; 45, image acquisition cavity; 46, return pipe; 47, refrigerator; 48, image collector; 5, air compressor; 50, electric closing switch; 51, bottom knob switch; 52, micro motor; 53, driving gear; 54, arc-shaped dust accumulation collection box. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present application will be described herein below with reference to the drawings; it should be understood that the preferred embodiments described herein are intended to describe and explain the present application only, and are not intended to limit the present application.

[0043] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and does not mean to particularly indicate the order or sequence, nor to limit the present application, which is merely to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features of various embodiments can be combined with each other, but it must be based on the realization of a person skilled in the art, when the combination of technical solutions appears to be contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0044] The present application provides the following embodiments

[0045] Embodiment 1

[0046] The embodiment of the present application provides a coal-fired boiler air volume measuring device, as shown in Figures 1-6 , comprising:

[0047] The flow uniformity module is used for uniform flow of the wind in the secondary air horizontal pipeline 1.

[0048] The acquisition and measurement module is used for air volume acquisition and measurement of the wind in the secondary air horizontal pipeline 1.

[0049] The blockage detection module is used for monitoring the blockage condition of the acquisition and measurement module.

[0050] The dredging execution module is used for dredging the acquisition and measurement module when the acquisition and measurement module is blocked.

[0051] The working principle and beneficial effects of the above technical solution are: during operation, the flow equalization module first equalizes the flow of the secondary air passing therethrough, the secondary air after flow equalization is collected and detected by the collection and measurement module, the blockage detection module monitors the blockage condition of the collection and measurement module in real time, and the dredging execution module dredges the collection and measurement module when the collection and measurement module is blocked.

[0052] Through the cooperative work of the flow equalization module, the collection and measurement module, the blockage detection module and the dredging execution module, effective measurement of the secondary air flow of the coal-fired boiler can be realized, and the blockage condition of the collection and measurement module can be monitored in real time and dredged in time, thereby ensuring the continuity and stability of the air flow measurement, avoiding measurement interruption or inaccurate data caused by blockage, and improving the reliability and practicality of the overall device.

[0053] The present application can equalize the flow of the air in the secondary air horizontal pipeline 1 by setting the flow equalization module, solve the problem of uneven air distribution caused by the lack of effective flow equalization structure in the existing device, affect the accuracy of air flow collection, and provide reliable data for boiler combustion control by setting the collection and measurement module. The blockage detection module can monitor the blockage condition of the collection and measurement module in real time, avoid the problem that the existing device relies on manual periodic inspection of blockage, has high maintenance cost, and may cause measurement data distortion or interruption due to blockage not being found in time, and the dredging execution module can dredge in time when the collection and measurement module is blocked, overcome the defects of the existing device that rely on manual dredging, have low efficiency and poor effect, realize automatic dredging, and improve the reliability, practicality, accuracy and stability of the device. The air flow measurement better meets the needs of safe, economic and environmentally friendly operation of coal-fired boilers.

[0054] Embodiment 2

[0055] On the basis of embodiment 1, the flow equalization module comprises a flow equalization grid 2, the flow equalization grid 2 is installed in the secondary air horizontal pipeline 1, the flow equalization grid 2 comprises a plurality of horizontally arranged horizontal grids 20 and a plurality of vertically arranged vertical grids 21, the horizontal grids 20 and the vertical grids 21 are arranged perpendicular to each other, the horizontal grids 20 are provided with a plurality of longitudinal flow equalization holes 22, and the vertical grids 21 are provided with a plurality of transverse flow equalization holes 23.

[0056] The working principle and beneficial effects of the above technical solution are: the horizontal grids 20 and the vertical grids 21 are arranged perpendicular to each other, and the design of the longitudinal flow equalization holes 22 on the horizontal grids 20 and the transverse flow equalization holes 23 on the vertical grids 21 ensures the flow equalization effect.

[0057] The arrangement of the horizontal grid 20 and the vertical grid 21 crossing each other, combined with the longitudinal flow uniform holes 22 on the horizontal grid 20 and the transverse flow uniform holes 23 on the vertical grid 21, can comb and guide the airflow from different directions, effectively improve the flow uniformity, make the airflow in the secondary air horizontal pipeline 1 more uniform and stable, provide uniform airflow conditions for the subsequent air volume collection and measurement of the collection and measurement module, and help improve the accuracy of air volume measurement.

[0058] Embodiment 3

[0059] Based on the embodiment 1, the collection and measurement module includes a plurality of main sampling pipes 3, and the main sampling pipes 3 are connected with a plurality of sampling branch pipes 30, and the sampling branch pipes 30 are provided with air volume sensors 31.

[0060] The working principle and beneficial effects of the above technical scheme are as follows: the secondary air enters the sampling branch pipe 30 through the sampling branch pipe 30 inlet, and the air volume is measured by flowing through the air volume sensor 31. Since the plurality of air volume sensors 31 are uniformly arranged on the secondary air horizontal pipeline 1 section from the secondary air horizontal pipeline 1 section, the air volume at different positions of the secondary air horizontal pipeline 1 section can be collected, and the diversity of the collected data is ensured.

[0061] Through the plurality of main sampling pipes 3 and the plurality of sampling branch pipes 30 connected thereto, the air volume at different positions of the secondary air horizontal pipeline 1 section can be collected, the diversity and comprehensiveness of the collected data are ensured, the measurement deviation caused by single position sampling is avoided, the plurality of air volume sensors 31 are arranged to obtain air volume information from multiple angles, and the accuracy and reliability of air volume measurement are further improved.

[0062] Embodiment 4

[0063] Based on the embodiment 3, the blockage detection module includes:

[0064] The air volume transfer module is used to transfer the secondary air collected by the plurality of sampling branch pipes 30 to the blockage detection box 42, and filter the air through the self-cleaning filter screen 43;

[0065] The image acquisition sub-module is used to acquire images of the self-cleaning filter screen 43 at each angle at each time, and obtain a plurality of self-cleaning filter screen 43 acquisition images collected at each time;

[0066] The blockage analysis sub-module is used to analyze the image data collected by the image acquisition sub-module, obtain the to-be-unblocked coefficient of the collection and measurement module, and control the unblocking execution module based on the to-be-unblocked coefficient.

[0067] Preferably, the detection conveying pipe 41 and the backflow pipe 46 are respectively provided with a non-return valve one 410 and a non-return valve two 411.

[0068] The working principle and beneficial effects of the above technical solution are as follows: in operation, the secondary air is transferred through the air volume transfer sub-module to the blockage detection box 42, and the dust in the secondary air is attached to the self-cleaning filter screen 43 in the filtering process. The image acquisition sub-module acquires images of the self-cleaning filter screen 43 at each angle at each moment, obtains a plurality of self-cleaning filter screen 43 acquisition images collected at each moment, the blockage analysis sub-module analyzes the image data collected by the image acquisition sub-module, obtains the to-be-unblocked coefficient of the collection measurement module, and controls the unblocking execution module to work based on the to-be-unblocked coefficient.

[0069] The air volume transfer sub-module is used to transfer and filter the secondary air, so that the dust in the secondary air is attached to the self-cleaning filter screen 43, the image acquisition sub-module can acquire images of the filter screen at multiple angles, the blockage analysis sub-module can obtain the to-be-unblocked coefficient through image analysis, and the blockage condition of the collection measurement module can be monitored in real time and accurately. The setting of the check valve one 410 and the check valve two 411 can prevent air flow from flowing backward, thereby ensuring the stability and accuracy of the blockage detection process. The unblocking execution module is controlled to work based on the to-be-unblocked coefficient, thereby realizing the linkage of blockage detection and unblocking, and improving the automation degree of the device.

[0070] Embodiment 5

[0071] Based on the embodiment 4, the air volume transfer sub-module comprises an arc-shaped transfer block 4, the arc-shaped transfer block 4 is internally provided with a transfer cavity 40, the transfer cavity 40 is communicated with a detection conveying pipe 41, one end of the detection conveying pipe 41 away from the transfer cavity 40 is communicated with a blockage detection box 42, the blockage detection box 42 is internally provided with a self-cleaning filter screen 43, the self-cleaning filter screen 43 divides the blockage detection box 42 into a cooling cavity 44 and an image acquisition cavity 45, the image acquisition cavity 45 is communicated with the secondary air horizontal pipe 1 through a backflow pipe 46, and the cooling cavity 44 is provided with a refrigerator 47.

[0072] The image acquisition sub-module comprises an image acquisition device 48, and the image acquisition device 48 is used to acquire images of the self-cleaning filter screen 43.

[0073] The blockage analysis sub-module comprises:

[0074] An auxiliary pixel determination unit is configured to acquire a pixel value of each pixel point in a self-cleaning filter screen 43 acquisition image collected at each moment, and calculate a pixel mean value of adjacent pixel points corresponding to each pixel point of the self-cleaning filter screen 43 acquisition image, and take the pixel mean value as an auxiliary pixel of the pixel point corresponding to the self-cleaning filter screen 43 acquisition image.

[0075] The filter screen background acquisition unit is configured to calculate the sum of the auxiliary pixels of the corresponding pixel points on the self-cleaning filter screen 43 acquisition images collected at each time, and take the quotient of the sum of the auxiliary pixels of the corresponding pixel points on the self-cleaning filter screen 43 acquisition images and the total number of the self-cleaning filter screen 43 acquisition images collected at each time as the filter screen background pixel value of the pixel point, and take the image composed of the filter screen background pixel values of each pixel point as the filter screen background image.

[0076] The accumulated dust area determination unit selects an image with the highest definition from the self-cleaning filter screen 43 acquisition images as an evaluation image, calculates the absolute value of the difference between the actual pixel value and the filter screen background pixel value of each pixel point in the evaluation image, and marks the pixel point as an accumulated dust area pixel point when the absolute value of the difference between the actual pixel value and the filter screen background pixel value of the pixel point is greater than a preset pixel difference value, and the area composed of all the accumulated dust area pixel points is the accumulated dust area, and the remaining area is the non-accumulated dust area.

[0077] The to-be-unblocked coefficient calculation unit is configured to count the accumulated dust area and calculate the to-be-unblocked coefficient of the collection and measurement module based on the accumulated dust area.

[0078] The unblocking judgment unit is configured to send an unblocking signal to the unblocking execution module when the to-be-unblocked coefficient of the collection and measurement module is greater than a preset to-be-unblocked coefficient of the collection and measurement module.

[0079] The to-be-unblocked coefficient of the collection and measurement module is calculated based on the accumulated dust area:

[0080] Wherein, W is the to-be-unblocked coefficient of the collection and measurement module, a is the accumulated dust area error compensation coefficient, S x is the real-time area of the accumulated dust area of the evaluation image, and S0 is the real-time area of the non-accumulated dust area.

[0081] The working principle and beneficial effects of the above technical solution are as follows: the secondary air enters the transfer chamber 40 through the sampling branch pipe 30 and the main sampling pipe 3, then enters the detection conveying pipe 41 through the transfer chamber 40, then enters the blockage detection box 42 through the detection conveying pipe 41, is filtered through the self-cleaning filter screen 43 in the blockage detection box 42, and finally returns to the secondary air horizontal pipe 1 again through the return pipe 46.

[0082] In the process, the image collector 48 collects images of the self-cleaning filter screen 43, the auxiliary pixel determination unit obtains the pixel value of each pixel point in each collected self-cleaning filter screen 43 image, and calculates the pixel mean value of the adjacent pixel points corresponding to each pixel point in each self-cleaning filter screen 43 image, which is used as the auxiliary pixel of the corresponding pixel point in the self-cleaning filter screen 43 image. Then, the filter screen background acquisition unit calculates the sum of the auxiliary pixels of the corresponding pixel points in a plurality of self-cleaning filter screen 43 images collected at each time, and the quotient of the sum of the auxiliary pixels of the corresponding pixel points in the self-cleaning filter screen 43 image and the total number of the self-cleaning filter screen 43 images collected at each time is used as the filter screen background pixel value of the pixel point. The image composed of the filter screen background pixel values of each pixel point is used as the filter screen background image. The dust accumulation area determination unit selects the image with the highest clarity among a plurality of self-cleaning filter screen 43 images as the evaluation image, calculates the absolute value of the difference between the actual pixel value of each pixel point in the evaluation image and the filter screen background pixel value thereof, and marks the pixel point as a dust accumulation area pixel point when the absolute value of the difference between the actual pixel value of the pixel point and the filter screen background pixel value thereof is greater than a preset pixel difference value. The area composed of all the dust accumulation area pixel points is the dust accumulation area, and the remaining area is the non-dust accumulation area. The dust accumulation area calculation unit calculates the dust accumulation area, and calculates the unclogging coefficient of the collection and measurement module based on the dust accumulation area. If the unclogging coefficient of the collection and measurement module is greater than a preset unclogging coefficient of the collection and measurement module, a unclogging signal is sent to the unclogging execution module.

[0083] By statistically analyzing the real-time area of the dust accumulation area and the real-time area of the non-dust accumulation area, it is proved that the larger the real-time area of the dust accumulation area is, the larger the dust content of the secondary air is. The dust accumulation on the self-cleaning filter screen 43 is used to determine the unclogging coefficient of the measurement module. The larger the unclogging coefficient of the measurement module is, the more serious the blockage is. After each unclogging, the self-cleaning filter screen 43 is cleaned, thereby avoiding the interference of the dust accumulated in the previous time on the calculation of the unclogging coefficient in the next time.

[0084] The arc-shaped middle transfer block 4, the middle transfer cavity 40, the detection conveying pipe 41 and other structures of the air volume middle transfer module realize the stable circulation of the secondary air. The refrigeration device 47 can reduce the temperature of the airflow, and the image collector 48 of the image collection sub-module can comprehensively obtain the filter screen image. The auxiliary pixel determination unit and the filter screen background acquisition unit of the blockage analysis sub-module can accurately construct the filter screen background image. The dust accumulation area determination unit can effectively identify the dust accumulation area by the pixel difference. The unclogging coefficient calculation formula can accurately reflect the blockage degree. The self-cleaning filter screen 43 is cleaned after each unclogging, thereby avoiding the interference of the dust accumulated in the previous time on the calculation of the unclogging coefficient in the next time. The accuracy and reliability of the blockage detection are improved, and accurate basis is provided for the unclogging execution.

[0085] Embodiment 6

[0086] On the basis of embodiment 3, the dredging execution module comprises:

[0087] an air compressor 5 arranged on the arc-shaped transfer block 4 and having an outlet end communicated with the arc-shaped transfer block 4, and the outlet end of the air compressor 5 is provided with a flow regulating valve;

[0088] a dredging cooperation switch group comprising a plurality of electrically closed switches 50 and a bottom knob switch 51, the electrically closed switches 50 being slidably connected in the main sampling pipe 3 and used for controlling the opening and closing of the sampling branch pipe 30, and the bottom knob switch 51 being installed at the lower part of the main sampling pipe 3, and the secondary air horizontal pipeline 1 being provided with a plurality of groups of opening and closing driving assemblies used for controlling the opening and closing of the main sampling pipe 3;

[0089] the opening and closing driving assembly comprising a micro motor 52 and a driving gear 53, the micro motor 52 being fixedly connected to the outer wall of the secondary air horizontal pipeline 1, and the driving gear 53 being fixedly connected to the output end of the micro motor 52 and being in mesh with the side wall of the bottom knob switch 51;

[0090] and further comprising an accumulated dust collecting assembly comprising an arc-shaped accumulated dust collecting box 54 arranged on the secondary air horizontal pipeline 1 and used for collecting the accumulated dust generated in the dredging process of the sampling and measuring module.

[0091] The working principle and beneficial effects of the above technical solution are as follows: when dredging, the bottom knob switch 51 is first in a closed state, and the electrically closed switch 50 is in an open state, at this time, the air compressor 5 is started to input the compressed high-pressure air into the main sampling pipe 3 through the flow regulating valve, and due to the bottom knob switch 51, the high-pressure air is sprayed out through the sampling branch pipe 30, which plays a role in cleaning and dredging the inner wall of the sampling branch pipe 30 in the spraying process, when the sampling branch pipe 30 is dredged, the electrically closed switch 50 is slid upward to block the sampling branch pipe 30, and at the same time, the micro motor 52 drives the driving gear 53 to rotate to rotate the bottom knob switch 51, so as to open the bottom knob switch 51, and then the high-pressure air impacts the main sampling pipe 3 to realize the cleaning and dredging of the main sampling pipe 3, and the dust scraped off in the cleaning and dredging process is impacted in the arc-shaped accumulated dust collecting box 54, and the inside of the arc-shaped accumulated dust collecting box 54 can be cleaned by opening the cover of the arc-shaped accumulated dust collecting box 54;

[0092] The high-pressure air provided by the air compressor 5 can effectively clean and dredge the sampling branch pipe 30 and the main sampling pipe 3. The dredging is matched with the electrically closed switch 50 and the bottom knob switch 51 of the switch group, combined with the micro motor 52 and the driving gear 53 of the on-off driving assembly, so that the sampling branch pipe 30 and the main sampling pipe 3 are dredged in steps, the pertinence and thoroughness of dredging are ensured, the flow regulating valve can adjust the flow of high-pressure air to adapt to different dredging needs, the arc-shaped accumulated dust collecting box 54 can effectively collect the accumulated dust generated in the dredging process, facilitate subsequent cleaning, avoid the accumulated dust from polluting the pipeline or affecting measurement again, and improve the maintenance convenience and service life of the device.

[0093] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A coal-fired boiler air flow measurement device, characterized by: The application relates to a secondary air flow uniformization and blockage detection device. The device comprises: a flow uniformization module for uniformizing the air flow in a secondary air horizontal pipeline (1); a flow collection and measurement module for collecting and measuring the air flow in the secondary air horizontal pipeline (1); a blockage detection module for detecting the blockage of the flow collection and measurement module; 2. A device for measuring the air volume of a coal-fired boiler according to claim 1, characterized in that: a dredging execution module for dredging the flow collection and measurement module when the module is blocked.

3. A device for measuring the air volume of a coal-fired boiler according to claim 1, characterized in that: The flow uniformization module comprises a flow uniformization grid (2) installed in the secondary air horizontal pipeline (1), wherein the flow uniformization grid (2) comprises a plurality of horizontally arranged grids (20) and a plurality of vertically arranged grids (21), the horizontally arranged grids (20) and the vertically arranged grids (21) are arranged in a perpendicular intersecting mode, the horizontally arranged grids (20) are provided with a plurality of longitudinal flow uniformization holes (22), and the vertically arranged grids (21) are provided with a plurality of transverse flow uniformization holes (23).

4. A device for measuring the air volume of a coal-fired boiler according to claim 3, characterized in that: The flow collection and measurement module comprises a plurality of main sampling pipes (3), the main sampling pipes (3) are connected with a plurality of sampling branch pipes (30), and the sampling branch pipes (30) are provided with air flow sensors (31). The blockage detection module comprises: an air flow transfer sub-module for transferring the secondary air collected by the sampling branch pipes (30) to a blockage detection box (42) and filtering the air through a self-cleaning filter screen (43); an image collection sub-module for collecting images of the self-cleaning filter screen (43) at each angle at each time, thereby obtaining a plurality of self-cleaning filter screen (43) collection images collected at each time; 5. A device for measuring the air volume of a coal-fired boiler according to claim 4, characterized in that: a blockage analysis sub-module for analyzing the image data collected by the image collection sub-module, obtaining a dredging coefficient of the flow collection and measurement module, and controlling the dredging execution module to work based on the dredging coefficient.

6. A device for measuring the air volume of a coal-fired boiler according to claim 4, characterized in that: The detection conveying pipe (41) and the backflow pipe (46) are respectively provided with a check valve one (410) and a check valve two (411). The air flow transfer sub-module comprises an arc-shaped transfer block (4), the arc-shaped transfer block (4) is provided with a transfer cavity (40), the transfer cavity (40) is communicated with the detection conveying pipe (41), one end of the detection conveying pipe (41) away from the transfer cavity (40) is communicated with the blockage detection box (42), the blockage detection box (42) is provided with the self-cleaning filter screen (43), the self-cleaning filter screen (43) divides the blockage detection box (42) into a cooling cavity (44) and an image collection cavity (45), the image collection cavity (45) is communicated with the secondary air horizontal pipeline (1) through the backflow pipe (46), and the cooling cavity (44) is provided with a refrigerator (47).

7. A device for measuring the air volume of a coal-fired boiler according to claim 6, characterized in that: The image collection sub-module comprises an image collector (48) for collecting images of the self-cleaning filter screen (43). The blockage analysis sub-module comprises: an auxiliary pixel determination unit for obtaining the pixel value of each pixel point in the self-cleaning filter screen (43) collection image collected at each time, calculating the pixel mean value of the adjacent pixel points corresponding to each pixel point of the self-cleaning filter screen (43) collection image, and taking the pixel mean value as the auxiliary pixel of the corresponding pixel point of the self-cleaning filter screen (43) collection image. The filter screen background acquisition unit is configured to calculate the sum of auxiliary pixels of corresponding pixel points on a plurality of self-cleaning filter screen (43) acquisition images collected at each time, and take the quotient of the sum of auxiliary pixels of corresponding pixel points on the self-cleaning filter screen (43) acquisition image and the total number of self-cleaning filter screen (43) acquisition images collected at each time as the filter screen background pixel value of the pixel point, and take the image composed of the filter screen background pixel value of each pixel point as the filter screen background image. The accumulated dust area determination unit selects an image with the highest definition from the plurality of self-cleaning filter screen (43) acquisition images as an evaluation image, calculates the absolute value of the difference between the actual pixel value of each pixel point in the evaluation image and the filter screen background pixel value thereof, and marks the pixel point as an accumulated dust area pixel point when the absolute value of the difference between the actual pixel value of the pixel point and the filter screen background pixel value thereof is greater than a preset pixel difference value, and the area composed of all accumulated dust area pixel points is the accumulated dust area, and the remaining area is a non-accumulated dust area. The to-be-unblocked coefficient calculation unit is configured to count the accumulated dust area, and calculate the to-be-unblocked coefficient of the collection and measurement module based on the accumulated dust area. The unblocking judgment unit sends an unblocking signal to the unblocking execution module when the to-be-unblocked coefficient of the collection and measurement module is greater than a preset to-be-unblocked coefficient of the collection and measurement module.

8. A device for measuring the air volume of a coal-fired boiler according to claim 7, characterized in that: The to-be-unblocked coefficient of the collection and measurement module is calculated based on the accumulated dust area. Wherein, W is the coefficient of the measurement module to be dredged, α is the error compensation coefficient of the area of the soot deposition area, S x S0 is the real-time area of the non-soot deposition area.

9. A device for measuring the air volume of a coal-fired boiler according to claim 6, characterized in that: The unblocking execution module comprises: The air compressor (5) is arranged on the arc-shaped transfer block (4) and communicates with the arc-shaped transfer block (4) at the outlet end, and the outlet end of the air compressor (5) is provided with a flow control valve. The unblocking cooperation switch group comprises a plurality of electrically closed switches (50) and a bottom knob switch (51), the electrically closed switches (50) are connected in the main sampling pipe (3) in a sliding manner, and are used to control the on-off of the sampling branch pipe (30), and the bottom knob switch (51) is installed at the lower part of the main sampling pipe (3), and a plurality of on-off driving assemblies are arranged on the secondary air horizontal pipeline (1), and the on-off driving assemblies are used to control the on-off of the main sampling pipe (3). The on-off driving assembly comprises a micro motor (52) and a driving gear (53), the micro motor (52) is fixedly connected to the outer wall of the secondary air horizontal pipeline (1), and the driving gear (53) is fixedly connected to the output end of the micro motor (52), and the driving gear (53) and the side wall of the bottom knob switch (51) are in meshing connection.

10. A device for measuring the air volume of a coal-fired boiler according to claim 9, characterized in that: The accumulated dust collection assembly comprises an arc-shaped accumulated dust collection box (54), the arc-shaped accumulated dust collection box (54) is arranged on the secondary air horizontal pipeline (1), and the arc-shaped accumulated dust collection box (54) is used to collect the accumulated dust generated in the unblocking process of the collection and measurement module.

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