Method and device for quickly judging failure of filter bag and storage medium

Abstract

The invention provides a method for quickly judging the failure of a filter bag, which comprises the following steps of: acquiring a concentration detection value signal of particulate matters discharged from a chimney outlet, comparing the concentration detection value signal with an HMI (Human Machine Interface) historical trend chart stored in an upper computer, marking data of which the difference value exceeds a set threshold value, carrying out mean value calculation on the data in a specific time period before and after the data, and judging the failure of the filter bag. The comparison operation is executed again, and if the difference value is higher than the set threshold value, the upper computer sends out a sound-light alarm signal through the PLC and the HMI; the time point is marked, counting is carried out once when each bin works, the counting is compared with a particulate matter numerical value in a trend chart page, and then the number of the filter bag which causes the particulate matter to be higher than a threshold value is obtained, the invalid bin can be quickly searched and judged through the method, and accurate bin cutting is achieved to avoid out-of-control and standard exceeding of environmental protection data. And the invalid cloth bag is replaced by manual trepanning and naked eye observation or fluorescent powder inspection, so that the cost of the cloth bag, manpower, materials and the like is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of particle detection equipment, and in particular to a method, a device and a storage medium for quickly judging the failure of a filter bag. Background Art

[0002] Exhaust gas particulate matter refers to substances that exist in the form of solid tiny particles in exhaust gas, and the exhaust gas particulate matter concentration emission refers to the mass of particulate matter contained in a unit volume of exhaust gas. In the industrial production process, in order to ensure that the mass of particulate matter contained in a unit volume of exhaust gas discharged into the environment meets the emission standards, the exhaust gas needs to be tested using an exhaust gas particulate matter concentration emission device before it is discharged.

[0003] Bag dust collector is a very common dust removal equipment in industrial production process. Bag dust collector sends dusty air into the dust collector box through the air inlet pipe. The dusty air passes through the bag, and the dust in it is filtered by the bag and falls into the ash hopper for collection. The filtered air is discharged into the atmosphere. Existing bag dust collectors send dusty air into the box through the air inlet pipe. There are several bags for dust removal in the box. The air flow rate of the bag closer to the air inlet pipe is relatively large, and the impact is more severe, which makes the bag easy to be damaged, resulting in the failure of the dust collector bag: if the bag is damaged, the dust will enter the clean air chamber along the hole, and floating dust or even dust accumulation will appear on the patterned plate.

[0004] Although the country currently adopts a unified national control detection system for detection, as the air stop valve opens, dust enters the air outlet and is detected by the national control point equipment through the chimney, but the national control detection system has the following problems in large-scale bag dust collectors (large-scale industrial production dust collectors with multiple chambers and multiple bags): The bag dust collectors designed and used in the existing design are equipped with inlet flue gas pressure, outlet flue gas pressure, and chimney outlet emission particulate matter detection (check in the detection room). The daily judgment of whether the dust collector filter bag is invalid is based on the outlet particulate matter emission detection value, so the invalid filter bag is checked and replaced. In this embodiment, the bag dust collector has 26 chambers, each with 238 bags. All chambers need to be opened manually one by one to check whether there is dust accumulation in the chamber. This task is large in workload and labor-intensive, and it is difficult to accurately control the rising or exceeding the standard chamber and make emergency treatment. Summary of the invention

[0005] The present invention proposes a method and device for quickly judging the failure of filter bags, which solves the problem in the prior art that it is difficult to accurately control the rise or over-standard chamber of large bag dust collectors and make emergency treatment. The technical solution of the present invention is achieved as follows:

[0006] A method for quickly judging the failure of filter bags includes the following steps: obtaining the signal of the detected value of the particulate matter concentration at the chimney outlet, comparing the obtained concentration value with the HM historical trend chart stored in the host computer, marking the data whose difference exceeds the set threshold, calculating the average value of the data within a specific time period before and after this data, and performing the above comparison operation again. If the difference is higher than the above set threshold, the host computer sends out an audible and visual alarm signal through the PLC and HMI; mark this time point, count once when each chamber is working, send this count value to the screen, number all the filter bags, and then add the chamber count in the HM historical trend chart in the host computer, and compare it with the particulate matter value on a trend chart page to obtain the filter bag number that causes the particulate matter to be higher than the threshold.

[0007] As a preferred technical solution, it specifically includes the following steps:

[0008] Step S1: After marking the data whose difference exceeds the set threshold, taking the time point of collecting this marked data as the initial moment t0, continuing backward along the time axis for the initial collection duration t1, and collecting N groups of initial detected values of the particulate matter concentration of emissions within this time period;

[0009] Step S2: Perform normalization calculation on the N groups of the detected values of the particulate matter concentration of emissions collected in Step S1, calculate the initial particulate matter change amount r1 between the detected values of the particulate matter concentration of emissions, and calculate the initial air particulate matter value d0 through the signals of the detected values of the particulate matter concentration of emissions;

[0010] Step S3: Count once every fixed time interval T, add the real-time particulate matter value and divide by the number of counts to obtain the average value; take this average value as the real-time detected value of the particulate matter concentration of emissions within this time period;

[0011] Step S4: Compare the real-time detected value of the particulate matter concentration of emissions obtained in Step S3 with the HMI historical trend chart stored in the host computer, confirm the particulate matter change time point, and determine the failure time point in combination with the set threshold;

[0012] S5: Mark this failure time point, count once when each chamber is working, send this count value to the screen, number all the filter bags, and then add the chamber count in the HMI historical trend chart in the host computer, and compare it with the particulate matter value on a trend chart page to obtain the filter bag number that causes the particulate matter to be higher than the threshold;

[0013] S6: Set the time period T0, and repeat the steps of S1 to S5 within each period.

[0014] As a preferred technical solution, the initial collection duration t1 is 1 min.

[0015] As a preferred technical solution, the particulate matter concentration threshold at the chimney outlet is 6 mg.

[0016] A device for quickly judging the failure of filter bags, which is used to execute the above-mentioned method for quickly judging the failure of filter bags, includes a dust collector body. The air outlet of the dust collector body is connected to a chimney through an electric fan. A national control detection probe is fixedly installed in the chimney, and the national control detection probe is connected to an on-line inspection room. The on-line monitoring room includes a PLC control room, and the detected data is processed through the PLC analog module of the PLC control room, and an alarm control signal is sent to the alarm device.

[0017] A non-transitory storage medium stores a program, and this program is used to make the host computer carried by a device for quickly judging the failure of filter bags perform the following actions: execute the above-mentioned method for quickly judging the failure of filter bags.

[0018] Compared with the prior art, the present solution has the following beneficial effects: It only needs to install a national control detection probe at the chimney of the existing bag filter, cooperate with a method for quickly judging the failure of filter bags stored in the on-line inspection room, and process the detected data through the PLC analog module of the PLC control room in combination with this method to quickly find and judge the failed compartment, so as to accurately cut the compartment and avoid the out-of-control and exceeding-standard of environmental protection data. When manually opening holes and observing with the naked eye or using fluorescent powder to check for failed filter bags and replace them, the costs of filter bags, labor, materials, etc. can be reduced. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is the method flow chart of a method for quickly judging the failure of filter bags of the present invention;

[0021] Figure 2 It is the structural schematic diagram of a device for quickly judging the failure of filter bags of the present invention;

[0022] Figure 3 It is the first electrical implementation circuit diagram of the dust collector bag failure detection method;

[0023] Figure 4 It is the second electrical implementation circuit diagram of the dust collector bag failure detection method of the present invention;

[0024] Figure 5This is the operation interface of the device for quickly judging the failure of filter bags in the present invention;

[0025] Figure 6 This is the circuit diagram for single chamber detection;

[0026] Figure 7 This is the background program code of the circuit diagram for single chamber detection;

[0027] Figure 8 This is the picture trend chart of the detection method for the failure of the dust removal bag in the dust collector;

[0028] Figure 9 This is the trend chart of the reverse blowing chamber and the trial reverse blowing trend chart in the dust collector;

[0029] Figure 10 This is the historical trend chart of particulate matter and the real-time online trend chart of particulate matter in the dust collector;

[0030] Figure 11 This is the historical trend chart and real-time trend chart of the matching of particulate matter in the dust collector with the chamber;

[0031] Figure 12 This is a screenshot of the alarm message interface;

[0032] Figure 13 This is the trend chart of the matching of particulate matter with the chamber. Specific implementation mode

[0033] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0034] Currently, a unified national control detection system is used for detection on the bag filter. As the stop valve is opened, dust enters the air outlet and is detected by the national control point equipment through the chimney. The national control detection room for particulate matter in the dust removal system: the particulate matter detection equipment installed by the state for the dust removal equipment. The corresponding national control system stipulates the following standards:

[0035] National control particulate matter emission in the dust removal system: ≤20mg

[0036] Ultra-low emission of national control particulate matter in the dust removal system: ≤10mg (this index is implemented for the unit)

[0037] Judgment of the failure of the dust removal bag in the dust collector: Usually, it refers to the exceeding of particulate matter standards, that is, greater than the ultra-low emission value. Generally, the dust removal filter bag is damaged and dust leaks into the upper chamber and enters the chimney with the air outlet, and the particulate matter value detected by the detection equipment exceeds the specified value.

[0038] However, the national control detection system has the following problems in large bag filters (large industrial production dust collectors with multiple compartments and multiple filter bags): In the existing design, the bag filter is equipped with inlet flue gas pressure, outlet flue gas pressure, and chimney outlet particulate matter emission detection (checked in the detection room). Daily, the filter bags of the dust collector are judged to be ineffective based on the outlet particulate matter emission detection value, and then the ineffective filter bags are inspected and replaced. In this embodiment, the bag filter has 26 compartments, with 238 filter bags in each compartment. It is necessary to manually open all compartments one by one to check whether there is ash accumulation in the compartment. This task has a large workload, high labor intensity, and it is difficult to accurately control the rising or exceeding-standard compartments and make emergency treatment.

[0039] Referring to Figure 1 , this application proposes a method and device for quickly judging the failure of filter bags, which solves the problem in the prior art that it is difficult to accurately control the rising or exceeding-standard compartments of large bag filters and make emergency treatment. The technical solution of the present invention is realized as follows:

[0040] A method for quickly judging the failure of filter bags includes the following steps: obtaining the signal of the particulate matter concentration detection value at the chimney outlet, comparing the obtained concentration value with the HMI historical trend chart stored in the host computer, marking the data with a difference exceeding the set threshold, calculating the average value of the data within a specific time period before and after this data, and performing the above comparison operation again. If the difference is higher than the above set threshold, the host computer sends an audible and visual alarm signal through the PLC and HMI; mark this time point, count once when each compartment is working, send this count value to the screen, number all the filter bags, and then add the compartment count in the HM historical trend chart in the host computer, and compare it with the particulate matter value on a trend chart page to obtain the filter bag number that causes the particulate matter to exceed the threshold.

[0041] Specifically, this solution does not require additional hardware devices. Only a national control detection head needs to be installed at the chimney. Referring to Figure 2 , the air outlet of the dust collector body is connected to the chimney through a blower. A national control detection probe is fixedly installed in the chimney. The national control detection probe is connected to the on-line inspection room. The on-line monitoring room includes a PLC control room, and the detected data is processed through the PLC analog module in the PLC control room, and an alarm control signal is sent to the alarm device.

[0042] Electrical implementation of the dust collector bag failure detection method:

[0043] The on-site particulate matter detection signal is sent to the PLC cabinet through a circuit, and after being isolated by an isolator, it is connected to the PLC analog module. To promptly detect data anomalies and ensure measurement accuracy, a particulate matter alarm and particulate matter average value calculation program are compiled. The alarm program emits an audible and visual alarm signal when the particulate matter is higher than the set threshold, facilitating operators to promptly detect data anomalies. The particulate matter average value program counts once per minute, and after accumulating with the real-time particulate matter value and dividing by the number of counts, the average value is obtained, enabling a more intuitive discovery of the intermittent changes in particulate matter. See the specific circuit diagram in Figure 3 and Figure 4 as shown.

[0044] On the operation screen ( Figure 5 ), the display of particulate matter and particulate matter average value is added, and audible and visual alarms are added when the particulate matter is high or low.

[0045] On the HMI, a particulate matter trend graph is added. Although it can reflect the changes in particulate matter, it cannot determine which chamber causes them. The program and the HMI historical trend graph are optimized again. When each chamber is working, it is counted once and sent to the HMI, and then the chamber count is added to the HMI historical trend graph. The chamber number and particulate matter data are placed on a trend graph page, so that it can be clearly seen which chamber's filter bag causes high particulate matter. See the circuit diagram in Figure 6 , and see the program code in Figure 7 .

[0046] Anomaly is detected through the changes in the differential pressure and particulate matter on the screen, and the corresponding chamber is found through the changes in the particulate matter in the trend graph, so that it can be quickly determined which chamber's filter bag has failed.

[0047] Implementation of the screen trend of the dust collector bag failure detection method ( Figure 8 ).

[0048] Dust collector reverse blow chamber trend graph and trial reverse blow trend graph ( Figure 9 ).

[0049] Dust collector particulate matter historical trend graph and particulate matter real-time online trend graph ( Figure 10 ).

[0050] Dust collector particulate matter and chamber matching historical trend graph and real-time trend graph ( Figure 11 ).

[0051] The specific judgment process is as follows:

[0052] Step S1: After marking the data with a difference exceeding the set threshold, taking the time point of collecting the marked data as the initial moment t0, continuing backward along the time axis for the initial collection duration t1, and collecting N groups of initial emission particulate matter concentration detection values within this time period;

[0053] Step S2: Normalize the N groups of detected emission particulate matter concentration values collected in Step S1, calculate the initial particulate matter change amount r1 between the detected emission particulate matter concentration values, and calculate the initial air particulate matter value d0 through the signal of each detected emission particulate matter concentration value;

[0054] Step S3: Count once every fixed time interval T, add the real-time particulate matter value and divide by the number of counts to obtain the average value; use this average value as the real-time detected emission particulate matter concentration value during this time period;

[0055] Step S4: Compare the real-time detected emission particulate matter concentration value obtained in Step S3 with the HM historical trend chart stored in the host computer to confirm the particulate matter change time point, and combine the set threshold to determine the failure time point;

[0056] S5: Mark this failure time point, count once when each chamber is working, send this count value to the screen, number all the filter bags, then add the chamber count in the HM historical trend chart in the host computer, and compare it with the particulate matter value in a trend chart page to obtain the filter bag number that causes the particulate matter to be higher than the threshold;

[0057] S6: Set the time period T0, and repeat the steps of S1 to S5 within each period.

[0058] In this solution: The specific parameter settings are as follows: The initial acquisition duration t1 is 1 min, and the chimney outlet emission particulate matter concentration threshold is 6 mg.

[0059] The dust collector quickly judges the failed chamber through the matching of particulate matter and chamber: Because it was mentioned earlier that the unit implements an ultra-low emission standard ≤10 mg, and when the program is set, the early warning is advanced to ≤6 mg, that is, when it exceeds 6 mg, the system will give an audible and visual alarm, and at the same time, a message will appear on the operation screen as a warning (such as Figure 12 ).

[0060] At this time, when opening the trend of particulate matter and chamber matching, it will be found that there is a fluctuating particulate matter trend and the corresponding chamber can be matched (because without high data, the fluctuation trend is not obvious).

[0061] According to the dust cleaning and reverse blowing characteristics of the dust collector, there is a process of stopping and opening the air when the chamber is switched, resulting in changes in air flow and air pressure, causing the floating ash or accumulated ash in the clean gas chamber to move and be captured by the monitoring equipment at the air outlet. Based on this, it can be judged that there is an abnormality in the opening or closing chamber.

[0062] Working principle: The existing bag filter used in the design is equipped with inlet flue gas pressure, outlet flue gas pressure, and chimney outlet emission particulate matter detection (check in the detection room). The daily output particulate matter emission detection value is used to determine whether the dust collector filter bag is invalid, so the invalid filter bag is checked and replaced. In this embodiment, the bag filter has 26 chambers, each with 238 bags. It is necessary to manually open all the chambers one by one to check whether there is dust accumulation in the chamber. This task is large in workload and labor-intensive, and it is difficult to accurately control the rising or exceeding the standard chamber and make emergency treatment. Through this transformation and optimization, the invalid chamber can be quickly found and judged, and the chamber can be accurately cut to avoid environmental protection data out of control and exceeding the standard. When performing manual opening and naked eye observation or fluorescent powder inspection, the invalid bag can be replaced, thereby reducing the cost of bags, labor, materials, etc.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for quickly judging filter bag failure, characterized in that: The following steps are involved: The detection value signal of the particle concentration of the chimney outlet is obtained, and the obtained concentration value is compared with the HMI historical trend chart stored in the host computer. The data whose difference exceeds the set threshold is marked, and the data in a specific time period before and after the data is averaged. The above comparison operation is performed again. If the difference is higher than the above set threshold, the host computer sends an audible and visual alarm signal through the PLC and HMI; mark the time point, count once when each chamber is working, send this count value to the screen, number all filter bags, and then add the chamber count to the HM historical trend chart in the host computer, put it and the particle value on a trend chart page for comparison, and then obtain the filter bag number that causes the particle to exceed the threshold.

2. A method for quickly judging filter bag failure as claimed in claim 1, characterized in that: The specific steps include: Step S1: after marking the data whose difference exceeds the set threshold, the time point of collecting the marked data is taken as the initial time t0, and the initial collection time t1 is extended backward on the time axis, and N groups of initial emission particulate matter concentration detection values ​​are collected within this time period; Step S2: normalizing the N groups of emission particulate matter concentration detection values ​​collected in step S1, calculating the initial particulate matter change r1 between the emission particulate matter concentration detection values, and calculating the initial air particulate matter value d0 through the emission particulate matter concentration detection value signals; Step S3: Count once every fixed time interval T, add the real-time particulate matter value and divide by the number of counts to get an average value; use the average value as the real-time emission particulate matter concentration detection value in the time period; Step S4: compare the real-time emission particulate matter concentration detection value obtained in step S3 with the HM historical trend chart stored in the host computer to confirm the particulate matter change time point, and determine the failure time point in combination with the set threshold value; S5: Mark the failure time point, count once when each chamber is working, send the count value to the screen, number all the filter bags, and then add the chamber count to the HMI historical trend chart in the host computer, compare it with the particle value in a trend chart page, and then obtain the filter bag number that causes the particle value to exceed the threshold; S6: Set a time period T0, and repeat steps S1 to S5 in each period.

3. A method for quickly judging filter bag failure according to any one of claims 1 to 2, characterized in that: The initial acquisition time t1 is 1 min.

4. A method for quickly judging filter bag failure according to any one of claims 1 to 2, characterized in that: The threshold value of particulate matter concentration emitted from the chimney outlet is 6 mg.

5. A device for quickly judging filter bag failure, which is used to execute a method for quickly judging filter bag failure as described in any one of claims 1 to 4, characterized in that: It includes a dust collector body, the air outlet of the dust collector body is connected to the chimney through an electric fan, a national control detection probe is fixedly installed in the chimney, the national control detection probe is connected to an online inspection room, the online monitoring room includes a PLC control room, and the detected data is processed by the PLC analog module of the PLC control room, and an alarm control signal is sent to the alarm device.

6. A non-temporary storage medium, characterized in that: The non-temporary storage medium stores a program, which is used to enable a host computer carried by a device for quickly judging filter bag failure to perform the following actions: executing a method for quickly judging filter bag failure as described in any one of claims 1 to 4 above.

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