Dust collecting bag breaking detection device and control method

Abstract

The invention provides a dust collecting bag breaking detection device and a control method, and relates to the field of environmental protection technical equipment, and the dust collecting bag breaking detection device comprises a dust concentration detection system, a bin sampling system, a remote control valve and a leak detection controller. A sampling branch pipe is mounted in a gas purification chamber of each dust removal chamber, and the front end of the branch pipe is connected with a semicircular pipeline and is provided with a plurality of groups of capillary pipes to cover a complete path of filtered gas entering the offline valve; a centralized dust concentration sensor is matched with a valve switching system, each bin is detected in sequence in a polling detection mode, a high-precision sensor does not need to be independently installed in each bin, and the hardware cost is greatly reduced. The leak detection controller controls the sampling fan to generate negative pressure, the sampling valves of all the bins are opened in sequence, and the dust concentration is monitored in real time and compared with a preset threshold value. According to the invention, only one sensor is needed to cooperate with valve switching, and compared with a traditional scheme that each chamber is independently provided with a sensor, the hardware cost is reduced, detection of all chambers can be completed within 15 minutes, and the detection efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of environmental protection technology equipment, in particular, especially relates to a dust cloth bag broken detection device and control method. BACKGROUND

[0002] A large amount of high-concentration dust pollutants are generated in the process of steel and coking production, and cloth bag dust removal becomes the core equipment of dust control because it has a high efficient capture capacity of more than 99%. However, the problem of filter bag damage of dust remover has long plagued the stable operation of the industry. A single dust remover is usually composed of dozens of independent chambers, each chamber contains hundreds of filter bags. Once a single filter bag is damaged, the unfiltered smoke dust will be directly discharged into the atmosphere, resulting in instantaneous emission concentration exceeding the standard. Under the background of increasingly strict environmental protection standards, single-chamber bag breakage can trigger online monitoring alarm, and even cause the production of coke oven or blast furnace system to stop, resulting in huge economic losses. At present, there are still some limitations in fast and accurate detection and positioning of broken bag chamber. The traditional method needs to check each chamber one by one, which takes a long time of several hours or even several days. At present, the market can detect whether the bag is leaked by detecting the pressure difference inside and outside the dust remover cloth bag or installing dust sensors in the pipeline or clean gas chamber behind the dust cloth bag. When the pressure difference or concentration is higher than the set value, it indicates that the dust cloth bag has leaked. However, this method needs to install high-precision dust and pressure difference sensors in each chamber, and the data needs to be accessed to PLC / DCS system for processing. For the dust remover with dozens of chambers in steel and coking plants, the hardware cost is greatly increased, and the cost is further increased under the current economic downturn.

[0003] Therefore, there is an urgent need for a device that can detect the use of cloth bags in real time online, and accurately define the damage of each cloth bag, improve the positioning speed of cloth bag damage, and save time by replacing the cloth bag in time. SUMMARY

[0004] In order to solve the above technical problems, a dust cloth bag broken detection device and control method are provided. The present application detects the dust concentration of each chamber by wheel sampling, and uses capillary to cover the airflow path, to realize a low-cost and high-efficiency cloth bag damage accurate positioning detection system.

[0005] In order to achieve the above purpose, the present application provides a dust cloth bag broken detection device and control method, which comprises a dust concentration detection system, a dust control system, a chamber sampling system, a remote control valve and a leakage detection controller. The chamber sampling system comprises a plurality of sampling branch pipes, each sampling branch pipe is installed in the clean gas chamber of the dust chamber, and the sampling branch pipe is installed between the clean gas chamber offline valve and the cloth bag flower plate; The front end of the sampling branch pipe is connected with a semicircular pipeline, and a plurality of capillaries are arranged on the semicircular pipeline, which can cover the path of the filtered gas entering the offline valve; The sampling branch pipe is fixed on the upper cover of the dust collector, and a remote control valve is installed after penetrating the upper cover of the dust collector; The rear end of the sampling branch pipe of the plurality of chambers is connected with a sampling main pipe, and a small centrifugal sampling fan is installed at the rear end of the sampling main pipe, and the pressure head of the sampling fan is not less than 7500 Pa; The dust concentration detection system comprises a dust concentration detection sensor and a pressure sensor installed at the sampling main pipe at the inlet of the sampling fan, the dust concentration sensor can transmit the dust concentration signal to the leak detection controller in real time, and the pressure sensor can transmit the negative pressure data of the sampling fan to the leak detection controller in real time; The leak detection controller is installed near the sampling fan, the shell protection level is not less than IP65, the corrosion resistance level is not less than WF2, the heating element is arranged in the leak detection controller, and the leak detection controller has very high protection and corrosion resistance level, and can stably operate in the environment of-20℃~60℃. The leak detection controller and the dust removal control system are communicated to send the operation condition, alarm data and detection result of the equipment to the dust removal control system in real time.

[0006] Further, the sampling fan can generate sufficient negative pressure to suck the air in the dust collector chamber into the sampling fan through the capillary tube on the sampling branch pipe and discharge it.

[0007] Further, the range of the dust concentration sensor is selected as 0~100mg / m3. And the dust concentration signal is compared with the dust concentration threshold value and the working condition.

[0008] Further, the leak detection controller has a self-learning function, and can adjust the dust concentration threshold value according to the sampling data and the dust collector operation condition received by the dust collector.

[0009] The application also provides a control method of the dust bag breaking detection device of the dust removal cloth bag. S1, the system is powered on and operated, the leak detection controller and the dust concentration sensor are powered on and self-checked, after the self-checking is completed, the leak detection controller controls the sampling fan to start and monitors the value of the pressure sensor installed on the sampling main pipe in front of the sampling fan; S2, when the pressure sensor reaches the negative pressure value preset by the system, generally-5500~7500 Pa, the set value is dynamically adjusted according to the on-site sampling pipe arrangement and the sampling fan parameter, the leak detection controller controls the remote control valve on the sampling branch pipe of the first chamber to open; S3, the sampling fan sucks the gas in the first dust collector chamber into the sampling main pipe through the capillary tube at the front end of the sampling branch pipe, and the leak detection controller monitors the value of the dust concentration sensor on the sampling main pipe in real time; S4, after the sampling time of the first chamber reaches the system preset sampling time, the sampling branch valve of the first chamber is closed, the sampling time can be set as 1-999s, generally, the sampling time is set according to the number of dust removal chambers, for example, the sampling time of 10 dust removal chambers is generally set as 50-80s, and the sampling time of 20 dust removal chambers is generally set as 30-50s; S5, the leak detection controller controls the remote control valve on the sampling branch of the second chamber to open, and the leak detection controller monitors the value of the dust concentration sensor on the sampling main pipe in real time; S6, the leak detection controller sequentially detects each chamber according to the program logic, that is, the leak detection controller sequentially detects the chambers from the first chamber to the last chamber, and after the last chamber is detected, the next cycle starts from the first chamber, the cycle time is the product of the number of chambers and the sampling time of a single chamber, and generally, the cycle time is controlled to be less than 15 minutes.

[0010] Further, when the leak detection controller finds that the dust concentration of a chamber exceeds the system preset dust concentration threshold during the chamber round detection, the leak detection controller stops the round function, enters the bag leak detection mode, and prolongs the sampling and detection time of the chamber whose dust concentration exceeds the preset value, generally by 2-5 times of the normal setting value.

[0011] Further, the leak detection controller sends a forced detection instruction to the dust collector control system, and the dust collector control system controls the dust removal fan to be high speed and controls the pulse valve of the chamber to be online blown.

[0012] Further, the leak detection controller monitors the sampled dust concentration in real time by using a reference method and a sensor to synchronously measure the average mass concentration of dust in the test section, at least 5 pairs of measurement results in the same time interval and under the same state are obtained, and the accuracy of the dust concentration is calculated according to the following method: Absolute error: Relative error: Wherein, : absolute error, mg / m 3 ; n: number of measurements; : the i-th mass concentration measured by the reference method, mg / m 3 : the mass concentration measured at the same time as the reference method, mg / m 3 : relative error, %.

[0013] ​​​Further, if the dust concentration is found to be always over standard during the detection process, it is judged that the bag in the chamber is damaged, the leak detection controller sends a bag breaking instruction of the chamber to the dust removal control system, the dust removal control system controls the chamber offline valve to be closed, and an alarm information is displayed to guide the maintenance personnel to replace the damaged bag according to the alarm information, and the bag leak detection mode is exited.

[0014] Further, the leak detection controller continues to detect each dust chamber in a round-robin manner, and automatically skips the chamber that has been alarmed, when the maintenance personnel replace the bag, the dust removal control system sends a recovery instruction to the leak detection controller, the leak detection controller resets the alarm information of the chamber, and the chamber round-robin sampling detection is restored.

[0015] Compared with the prior art, the dust bag breaking detection device and control method has the following advantages: 1. The dust bag breaking detection device and control method provided by the application adopts a centralized detection architecture, only one dust concentration sensor is needed to cooperate with a valve switching system, and the round-robin detection of all chambers of the dust remover can be completed, compared with the traditional method of installing high-precision sensors in each chamber, the hardware cost is reduced. At the same time, the significant reduction in the number of devices significantly reduces the maintenance workload of the system, reduces the maintenance complexity, and brings significant economic benefits to the user.

[0016] 2. The dust bag breaking detection device and control method provided by the application, through the innovative round-robin detection algorithm and the capillary full-coverage sampling technology, the system can complete the detection cycle of all chambers within 15 minutes, compared with the traditional method of checking each chamber one by one for several hours or even several days, the detection efficiency is greatly improved, once an abnormality is found, the system immediately enters the accurate leak detection mode, the detection time is prolonged by 2-5 times for confirmation, and the positioning accuracy of the damaged chamber is ≥99%, effectively avoiding unnecessary downtime loss caused by false alarms.

[0017] 3. The dust bag breaking detection device and control method provided by the application, the system is equipped with an IP65 level protective shell and a WF2 level corrosion resistant design, which is suitable for harsh working conditions of-20℃~60℃, and integrates a self-learning algorithm, which can automatically adjust the dust concentration threshold according to real-time operation data, ensure that the detection accuracy is always maintained in the optimal state, the leak detection controller and the dust removal control system realize seamless communication, can transmit the equipment operation state, alarm data and detection results in real time, and form a complete intelligent monitoring closed loop. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings described below are only some embodiments of the present application, and the ordinary skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0019] Figure 1 is a top view of a dust bag breaking detection device installation structure according to the present application; Figure 2 is a side view of a dust bag breaking detection device installation structure according to the present application; Figure 3 is a control method flow chart of a dust bag breaking detection device according to the present application.

[0020] In the figure: 1, warehouse chamber sampling system; 11, sampling branch pipe; 12, semicircular pipeline; 13, capillary tube; 14, sampling main pipe; 15, sampling fan; 2, dust concentration detection system; 3, remote control valve; 4, leak detection controller. DETAILED DESCRIPTION

[0021] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by the ordinary skilled in the art without any creative effort are within the scope of protection of the present application.

[0023] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0024] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations are intended to be included within the scope of the present application as defined in the following claims, along with full equivalents thereof.

[0025] In the description of the present application, it is to be understood that the orientation terms such as "front", "back", "up", "down", "left", "right", "transverse", "vertical", "horizontal", "top", "bottom", etc. indicate the orientation or positional relationship shown in the drawings, which are merely for the convenience of describing and simplifying the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the contour of the components themselves.

[0026] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0027] In addition, it should be noted that the use of the terms "first", "second", etc. to qualify parts of components is merely for the convenience of distinguishing the corresponding parts of components, and the above terms have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0028] As Figures 1 to 2As shown, the present application provides a dust cloth bag breaking detection device and control method, which comprises a dust concentration detection system, a dust removal control system, a chamber sampling system, a remote control valve and a leak detection controller. The chamber sampling system comprises a plurality of sampling branch pipes, each of which is installed in the clean gas chamber of the dust removal chamber, and the sampling branch pipe is installed between the clean gas chamber offline valve and the cloth bag flower plate. The front end of the sampling branch pipe is connected with a semicircular pipeline, and a plurality of capillary tubes are arranged on the semicircular pipeline, which can cover the path of the filtered gas entering the offline valve. The sampling branch pipe is fixed on the upper cover of the dust remover, and a remote control valve is installed after penetrating the upper cover of the dust remover. The rear ends of the sampling branch pipes of a plurality of chambers are combined with a sampling main pipe, and a small centrifugal sampling fan is installed at the rear end of the sampling main pipe. The sampling fan can generate sufficient negative pressure to suck the air in the dust remover chamber into the sampling fan through the capillary tubes on the sampling branch pipes and discharge it. The pressure head of the sampling fan is not less than 7500Pa. The dust concentration detection system comprises a dust concentration detection sensor and a pressure sensor installed at the sampling main pipe at the inlet of the sampling fan. The dust concentration sensor can transmit the dust concentration signal to the leak detection controller in real time, and the pressure sensor can transmit the negative pressure data of the sampling fan to the leak detection controller in real time. The range of the dust concentration sensor is selected to be 0~100mg / m3. And according to the pre-set dust concentration threshold and the dust concentration signal, sufficient negative pressure is ensured to smoothly extract the gas in each chamber, meeting the needs of dust removers of different scales. The leak detection controller is installed near the sampling fan, and the shell protection level is not less than IP65, the corrosion resistance level is not less than WF2, the heating element is arranged in the leak detection controller, and the protection and corrosion resistance levels are very high, which can stably operate in the environment of-20℃~60℃. The leak detection controller and the dust removal control system communicate with each other to send the operation of the equipment, alarm data and detection results to the dust removal control system in real time.

[0029] Further, the leak detection controller has a self-learning function, which can adjust the dust concentration threshold according to the sampling data and the dust remover received dust remover operation condition, automatically adjust the dust concentration threshold, automatically adapt to different working conditions, and not exceed 2 times of the emission standard.

[0030] As Figure 3 As shown, the present application also provides a dust cloth bag breaking detection device and control method, which comprises a dust concentration detection system 2, a chamber sampling system 1, a remote control valve 3 and a leak detection controller 4. The chamber sampling system 1 includes a plurality of sampling branches 11, each of which is installed in the clean air chamber of the dust removal chamber, and the sampling branch 11 is installed between the clean air chamber offline valve and the bag flower plate; The front end of the sampling branch pipe 11 is connected to a semicircular pipe 12, and a plurality of capillaries 13 are provided on the semicircular pipe 12 to cover the path for the filtered gas to enter the offline valve; The sampling branch pipe 11 is fixed on the upper cover of the dust collector and is installed with a remote control valve 3 after passing through the upper cover of the dust collector; The rear ends of the sampling branches 11 of the multiple chambers merge with the sampling main pipe 14. A small centrifugal sampling fan 15 is installed at the rear end of the sampling main pipe 14. The sampling fan 15 can generate sufficient negative pressure to draw the air in the dust collector chamber through the capillary 13 on the sampling branch pipe 11 and discharge it into the sampling fan 15. The pressure head of the sampling fan 15 is not less than 7500 Pa. The dust concentration detection system 2 includes a dust concentration detection sensor and a pressure sensor installed at the sampling main pipe 14 at the inlet of the sampling fan 15. The dust concentration sensor can transmit the dust concentration signal to the leak detection controller 4 in real time, and the pressure sensor can transmit the negative pressure data of the sampling fan 15 to the leak detection controller 4 in real time. The range of the dust concentration sensor is 0~100mg / , and compare the dust concentration signal with the preset dust concentration threshold and working conditions. Sufficient negative pressure ensures smooth extraction of gas from each chamber to meet the needs of dust collectors of different sizes. The leak detection controller 4 is installed near the sampling fan 15, the shell protection level is not less than IP65, the anti-corrosion level is not less than WF2, the leak detection controller 4 is provided with a heating element inside, has extremely high protection and anti-corrosion levels, and can operate stably in an environment of -20℃~60℃; The leakage detection controller 4 communicates with the dust removal control system to send the equipment's operating conditions, alarm data and detection results to the dust removal control system in real time.

[0031] Furthermore, the leak detection controller 4 has a self-learning function, which can adjust the dust concentration threshold according to the sampling data and the dust collector operating conditions received by the dust collector, automatically adjust the dust concentration threshold, and automatically adapt to different operating conditions, not exceeding 2 times the emission standard.

[0032] like Figure 3 As shown, the present invention also provides a control method for a dust bag breakage detection device, comprising the following steps: S1. The system is powered on and the leak detection controller 4 and the dust concentration sensor are powered on for self-test. After the self-test is completed, the leak detection controller 4 controls the sampling fan 15 to start and monitors the value of the pressure sensor installed on the sampling main pipe 14 in front of the sampling fan 15; S2, when the pressure sensor reaches the system preset negative pressure value, generally-5500~7500Pa, the set value is dynamically adjusted according to the on-site sampling pipe arrangement and the parameter of the pressure fan, and the leak detection controller 4 controls the remote control valve 3 on the first chamber sampling branch pipe 11 to open; S3, the sampling fan 15 sucks the gas in the first dust collector chamber through the capillary tube 13 at the front end of the sampling branch pipe 11 into the sampling main pipe 14, and the leak detection controller 4 monitors the value of the dust concentration sensor on the sampling main pipe 14 in real time; S4, after reaching the sampling time of the first chamber, the sampling branch pipe 11 valve of the first chamber is closed, and the sampling time system can be set as 1~999s, generally according to the number of dust removal chambers to set appropriate sampling time, and the sampling time of 10 dust removal chambers is generally set as 50~80s, and the sampling time of 20 dust removal chambers is generally set as 30~50s; S5, the leak detection controller 4 controls the remote control valve 3 on the second chamber sampling branch pipe 11 to open, and the leak detection controller 4 monitors the value of the dust concentration sensor on the sampling main pipe 14 in real time; S6, the leak detection controller 4 sequentially patrols and samples each chamber according to the program logic, that is, from the first chamber to the last chamber in sequence, and after detecting the last chamber, the next cycle starts from the first chamber, and the cycle time is the product of the number of chambers and the sampling time of a single chamber, generally not more than 15 minutes.

[0033] Further, when the leak detection controller 4 finds that the dust concentration of a chamber exceeds the system preset dust concentration threshold value during the chamber patrol detection process, the leak detection controller 4 stops the patrol function, enters the bag leak detection mode, and prolongs the sampling and detection time of the chamber whose dust concentration exceeds the preset value, generally by 2~5 times of the normal set value, the prolonged detection time reduces the influence of accidental factors, and the special leak detection mode improves the detection reliability.

[0034] Further, the leak detection controller 4 sends a forced detection instruction to the dust collector control system, the dust collector control system controls the dust fan to be high speed, and controls the pulse valve of the chamber to be online blown, so as to verify the abnormal judgment through forced detection, quickly confirm the bag breaking condition, and guide the subsequent processing.

[0035] Further, the leak detection controller 4 monitors the dust concentration of the sampling in real time by using the reference method and the sensor to synchronously measure the average mass concentration of the dust in the test section, at least 5 pairs of measurement results in the same time interval and under the same state are obtained, and the accuracy of the dust concentration is calculated according to the following method: Absolute error: ; Relative error: ; wherein, : absolute error, mg / m 3 ; n: number of determination; : the i-th mass concentration determined by the reference method, mg / m 3 : the mass concentration determined at the same period as the participating method, mg / m 3 ; : relative error, %; The measurement accuracy is improved by mathematical calculation method, and the accidental error is reduced by comparison of multiple groups of data.

[0036] Further, if it is found that the dust concentration is always over standard during detection, it is judged that the bag of the chamber is damaged, the leak detection controller 4 sends a bag breaking instruction of the chamber to the dust removal control system, the dust removal control system controls the offline valve of the chamber to be closed, and alarm information is displayed to guide the maintenance personnel to replace the damaged bag according to the alarm information. The bag leak detection mode is exited, and it is accurate to the specific chamber, reduces the maintenance workload, quickly isolates the fault chamber, and avoids emission over standard.

[0037] Further, the leak detection controller 4 continues to detect each dust collector chamber in turn, and automatically skips the chamber that has been alarmed. When the maintenance personnel replace the bag, the dust removal control system sends a recovery instruction to the leak detection controller 4, the leak detection controller 4 resets the chamber alarm information, the chamber sampling detection in turn is restored, the fault chamber does not affect the detection of other chambers, the processed chamber is automatically skipped, the detection efficiency is improved, and the maintenance is automatically restored after completion, without manual reset.

[0038] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A dust bag broken detection device, characterized in that: include: Dust concentration detection system, chamber sampling system, dust removal control system, remote control valve and leak detection controller; The chamber sampling system includes a plurality of sampling branches, each of which is installed in the clean air chamber of the dust removal chamber, and the sampling branch is installed between the clean air chamber offline valve and the bag flower plate; The front end of the sampling branch tube is connected to a semicircular pipe, and a plurality of capillaries are arranged on the semicircular pipe; The sampling branch pipe is fixed on the upper cover of the dust collector, and a remote control valve is installed after passing through the upper cover of the dust collector; The rear ends of the sampling branch pipes of the multiple chambers merge with the sampling main pipe, and a small centrifugal sampling fan is installed at the rear end of the sampling main pipe. The pressure head of the sampling fan is not less than 7500Pa; The dust concentration detection system includes a dust concentration detection sensor and a pressure sensor installed at the sampling main pipe at the inlet of the sampling fan. The dust concentration sensor can transmit the dust concentration signal to the leak detection controller in real time, and the pressure sensor can transmit the negative pressure data of the sampling fan to the leak detection controller in real time; The leak detection controller is installed at the inlet of the sampling fan, the shell protection level is not lower than IP65, the anti-corrosion level is not lower than WF2, and a heating element is set inside the leak detection controller; The leakage detection controller and the dust removal control system communicate with each other to send the equipment's operating conditions, alarm data and detection results to the dust removal control system in real time.

2. A dust bag breakage detection device according to claim 1, characterized in that: The sampling fan can generate enough negative pressure to draw the air in the dust collector chamber into the sampling fan through the capillary on the sampling branch pipe and discharge it.

3. The dust bag breakage detection device according to claim 1, characterized in that: The dust concentration sensor has a range of 0~100mg / , and compare it with the dust concentration signal based on the preset dust concentration threshold and working conditions.

4. The dust bag breakage detection device according to claim 1, characterized in that: The leak detection controller has a self-learning function and can adjust the dust concentration threshold according to the sampling data and the dust collector operating conditions received by the dust collector.

5. A control method for a dust bag breakage detection device, based on the device according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. The system is powered on and the leak detection controller and dust concentration sensor are powered on for self-test. After the self-test is completed, the leak detection controller controls the sampling fan to start and monitors the value of the pressure sensor installed on the sampling main pipe in front of the sampling fan. S2. When the pressure sensor reaches the system preset negative pressure value, generally -5500~7500Pa, the set value is dynamically adjusted according to the on-site sampling pipe layout and pressure fan parameters, and the leak detection controller controls the remote control valve on the first chamber sampling branch pipe to open; S3. The sampling fan draws the gas from the first dust collector chamber into the sampling main pipe through the capillary at the front end of the sampling branch pipe. The leak detection controller monitors the value of the dust concentration sensor on the sampling main pipe in real time. S4. When the sampling time of the first chamber preset by the system is reached, the sampling branch valve of the first chamber is closed. The sampling time system can set the parameter to 1 to 999 seconds. Generally, the appropriate sampling time is set according to the number of dust removal chambers. The sampling time of 10 dust removal chambers is generally set to 50 to 80 seconds, and the sampling time of 20 dust removal chambers is generally set to 30 to 50 seconds. S5. The leak detection controller controls the remote control valve on the sampling branch pipe of the second chamber to open, and the leak detection controller monitors the value of the dust concentration sensor on the sampling main pipe in real time; S6. The leak detection controller performs round-trip sampling and testing on each chamber in accordance with the program logic, i.e., it starts from the first chamber and tests the chambers in sequence to the last chamber. After testing the last chamber, the next cycle starts from the first chamber. The time for one cycle is the product of the number of chambers and the sampling time of a single chamber. Generally, the time for one cycle is controlled to be no more than 15 minutes.

6. The control method of the dust bag breakage detection device according to claim 5, characterized in that: When the leak detection controller finds that the dust concentration in a certain chamber exceeds the dust concentration threshold preset by the system during the chamber patrol detection process, the leak detection controller stops the patrol function, enters the bag leak detection mode, and extends the sampling and detection time of the chamber where the dust concentration exceeds the preset value.

7. The control method of the dust bag breakage detection device according to claim 6, characterized in that: The leak detection controller sends a forced detection instruction to the dust collector control system, and the dust collector control system turns on the dust removal fan at high speed and controls the pulse valve of the chamber to perform online blowing.

8. The control method of the dust bag breakage detection device according to claim 7, characterized in that: The leak detection controller monitors the sampled dust concentration in real time and uses a reference method to synchronously measure the average mass concentration of dust in the test section with the sensor, obtaining at least 5 pairs of measurement results in the same time interval and the same state, and calculating the accuracy of the dust concentration according to the following method: Absolute error: ; Relative error: ; in, : Absolute error, mg / m 3 ; n: number of measurements; : The ith mass concentration determined by the reference method, mg / m 3 ;: Mass concentration measured at the same time as the participating method, mg / m 3 ; : Relative error, %.

9. The control method of the dust bag breakage detection device according to claim 8, characterized in that: If the dust concentration is found to be exceeding the standard during the detection process, it is judged that the bag in this chamber is damaged. The leak detection controller sends a bag breaking instruction for this chamber to the dust removal control system. The dust removal control system controls the offline valve of this chamber to close and displays an alarm message, guiding the maintenance personnel to complete the replacement of the damaged bag according to the alarm message, and the bag leak detection mode exits.

10. The control method of the dust bag breakage detection device according to claim 9, characterized in that: The leak detection controller continues to patrol and detect each dust collector chamber, and automatically skips the chamber that has already alarmed. When the maintenance personnel replace the bag, the dust removal control system sends a recovery instruction to the leak detection controller, the leak detection controller resets the chamber alarm information, and the chamber patrol sampling detection is resumed.

Images