Monitoring system for baghouse

Abstract

The utility model discloses a kind of monitoring systems for bag dust collector, including bag chamber pressure difference monitoring mechanism, ash bucket material level monitoring mechanism, PLC control mechanism;The bag chamber pressure difference monitoring mechanism is used to cyclically obtain the pressure difference value of each bag chamber;The ash bucket material level monitoring mechanism is used to cyclically obtain the pressure value of each ash bucket;The PLC control mechanism is connected with bag chamber pressure difference monitoring mechanism, ash bucket material level monitoring mechanism respectively, for sequentially sending start-stop instruction to bag chamber pressure difference monitoring mechanism, ash bucket material level monitoring mechanism;It is also used to determine to generate alarm signal according to the comparison result of the pressure difference value of each bag chamber and first threshold value of feedback;It is also used to determine to generate alarm signal according to the comparison result of the pressure value of each ash bucket and second threshold value of feedback.

Description

Technical Field

[0001] This utility model belongs to the technical field of bag dust collectors, specifically relating to a monitoring system for bag dust collectors. Background Technology

[0002] The principle of a bag filter is to filter dust through filter bags, so the key to monitoring is to ensure the normal operation of the filter bags and the stable operation of the entire system.

[0003] The following aspects are mainly monitored during the operation of a bag filter:

[0004] 1. Bag chamber differential pressure and bag breakage ash leakage monitoring: Differential pressure transmitters are installed in the bag chambers to monitor the resistance of the filter bags in each chamber and whether there is filter bag breakage and ash leakage;

[0005] 2. Ash hopper level monitoring: Install high and low level gauges on the side plates of the ash hopper to monitor the height of ash accumulation in the ash hopper, so as to avoid safety accidents caused by large accumulation of ash in the ash hopper due to ash discharge blockage.

[0006] The shortcomings of existing technology:

[0007] 1. Relying on manual daily inspections or periodic kiln shutdowns for inspections of bag filters increases the labor costs of bag filter maintenance.

[0008] 2. Existing technology uses a differential pressure transmitter in each bag chamber to monitor the filter bag resistance. This monitoring method requires a large number of instruments, which not only increases the project investment cost but also increases the workload of daily maintenance and repair.

[0009] 3. Existing technology monitors the height of ash accumulation in ash hoppers by installing level gauges at different heights on the side plates of each ash hopper. This method not only requires a large number of instruments, but the level gauges also frequently malfunction and false alarm or fail to alarm during daily use, resulting in poor signal monitoring stability. Utility Model Content

[0010] In view of this, the main objective of this utility model is to provide a monitoring system for bag filters.

[0011] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0012] A monitoring system for a bag filter includes a bag chamber differential pressure monitoring mechanism, a dust hopper level monitoring mechanism, and a PLC control mechanism;

[0013] The differential pressure monitoring mechanism is used to cyclically acquire the differential pressure values ​​of each bag chamber;

[0014] The ash hopper level monitoring mechanism is used to cyclically acquire the pressure value of each ash hopper;

[0015] The PLC control mechanism is connected to the bag chamber differential pressure monitoring mechanism and the ash hopper level monitoring mechanism respectively, and is used to send opening and closing commands to the bag chamber differential pressure monitoring mechanism and the ash hopper level monitoring mechanism in sequence; it is also used to determine the generation of alarm signals based on the comparison result of the feedback differential pressure value of each bag chamber and the first threshold; it is also used to determine the generation of alarm signals based on the comparison result of the feedback pressure value of each ash hopper and the second threshold.

[0016] Preferably, the baghouse differential pressure monitoring mechanism includes a first differential pressure transmitter, a first pressure tap, a second pressure tap, and multiple first pressure tap branches; one end of the first pressure tap is used to connect to the gas inlet of the bag filter or a bag chamber, and the other end is connected to the low-pressure end of the first differential pressure transmitter; one end of the second pressure tap is connected to the high-pressure end of the first differential pressure transmitter, and the other end is connected in parallel to each of the first pressure tap branches; each first pressure tap branch is provided with a first solenoid valve, and the end of the valve away from the second pressure tap is used to connect to a clean air chamber of the bag filter.

[0017] Preferably, the differential pressure monitoring mechanism further includes a second differential pressure transmitter; the second differential pressure transmitter is connected in parallel with the first differential pressure transmitter; the low-pressure end of the second differential pressure transmitter is connected to the first pressure tapping pipe through a pipeline, and its high-pressure end is connected to the second pressure tapping pipe through a pipeline.

[0018] Preferably, manual valves are provided at the connection points of the first differential pressure transmitter and the second differential pressure transmitter with each pressure tapping pipeline.

[0019] Preferably, the ash hopper level monitoring mechanism includes a first pressure transmitter, a third pressure tapping pipe, and multiple second pressure tapping branch pipes; one end of the third pressure tapping pipe is connected to the first pressure transmitter, and the other end is connected in parallel to each of the second pressure tapping branch pipes; each of the second pressure tapping branch pipes is provided with a second solenoid valve, the end of which is away from the third pressure tapping pipe is used to connect to an ash hopper of a bag filter.

[0020] Preferably, the ash hopper level monitoring mechanism further includes a second pressure transmitter; the second pressure transmitter is connected in parallel with the first pressure transmitter and is connected to each of the second pressure branch pipes through the third pressure tapping pipe.

[0021] Preferably, the installation height of the second pressure-inducing branch pipe on the ash hopper wall plate corresponds to the material level height to be monitored.

[0022] Preferably, manual valves are provided at the connection points of the first pressure transmitter and the second pressure transmitter with the third pressure tap.

[0023] Preferably, the PLC control mechanism is electrically connected to the first differential pressure transmitter, the first pressure transmitter, each of the first solenoid valves, and each of the second solenoid valves.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] This utility model is based on a time-sharing sampling mechanism controlled by PLC (sequential opening and closing of solenoid valves) to simultaneously monitor the health of the bag chamber, capture filter bag damage and abnormal resistance in real time, and accurately locate the faulty bag chamber; as well as provide a safety warning for the ash hopper, which determines the risk of ash blockage by the positive or negative pressure value, replacing the traditional level gauge that is prone to failure; eliminating the need for manual inspection and shortening the fault response time to the minute level. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this invention, illustrate exemplary embodiments of the present invention and, together with their description, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0027] Figure 1 This invention provides a schematic diagram of the structure of a monitoring system for a bag filter.

[0028] Figure 2 for Figure 1 Side view;

[0029] Figure 3 This utility model provides a top view of a bag chamber differential pressure monitoring mechanism in a monitoring system for a bag dust collector.

[0030] Figure 4 This utility model provides a top view of a dust hopper level monitoring mechanism in a monitoring system for a bag filter.

[0031] Figure 5 for Figure 3 A magnified view of a portion of the image.

[0032] Figure 6 for Figure 3 Schematic diagram of the AA direction.

[0033] Figure 7 for Figure 4 This is a partially enlarged view of the ash hopper level monitoring mechanism in a monitoring system for a bag filter, as provided in this embodiment of the present invention. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0035] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0036] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0037] This utility model provides a monitoring system for bag filters, such as Figure 1-7 As shown, it includes a bag chamber differential pressure monitoring mechanism 1, a ash hopper material level monitoring mechanism 2, and a PLC control mechanism;

[0038] The differential pressure monitoring mechanism 1 is used to cyclically acquire the differential pressure value of each bag chamber;

[0039] The ash hopper level monitoring mechanism 2 is used to cyclically acquire the pressure value of each ash hopper;

[0040] The PLC control mechanism is connected to the bag chamber differential pressure monitoring mechanism 1 and the ash hopper level monitoring mechanism 2 respectively. It is used to send opening and closing commands to the bag chamber differential pressure monitoring mechanism 1 and the ash hopper level monitoring mechanism 2 in sequence. It is also used to determine the generation of alarm signals based on the comparison result of the feedback differential pressure value of each bag chamber and the first threshold. It is also used to determine the generation of alarm signals based on the comparison result of the feedback pressure value of each ash hopper and the second threshold.

[0041] This utility model is based on a time-sharing sampling mechanism controlled by PLC (sequential opening and closing of solenoid valves) to simultaneously monitor the health of the bag chamber, capture filter bag damage and abnormal resistance in real time, and accurately locate the faulty bag chamber; as well as provide a safety warning for the ash hopper, which determines the risk of ash blockage by the positive or negative pressure value, replacing the traditional level gauge that is prone to failure; eliminating the need for manual inspection and shortening the fault response time to the minute level.

[0042] The baghouse differential pressure monitoring mechanism 1 includes a first differential pressure transmitter 11, a first pressure tap 12, a second pressure tap 13, and a plurality of first pressure tap branches 14; one end of the first pressure tap 12 is used to connect to the gas inlet of the baghouse dust collector or a baghouse, and the other end is connected to the low-pressure end of the first differential pressure transmitter 11; one end of the second pressure tap 13 is connected to the high-pressure end of the first differential pressure transmitter 11, and the other end is connected in parallel to each of the first pressure tap branches 14; each of the first pressure tap branches 14 is provided with a first solenoid valve 141, and the end of the valve away from the second pressure tap 13 is used to connect to a clean air chamber of the baghouse dust collector.

[0043] The differential pressure monitoring mechanism 1 of the bag chamber further includes a second differential pressure transmitter 15; the second differential pressure transmitter 15 is arranged in parallel with the first differential pressure transmitter 11; the low pressure end of the second differential pressure transmitter 15 is connected to the first pressure tap 12 through a pipeline, and its high pressure end is connected to the second pressure tap 13 through a pipeline.

[0044] Manual valves 16 are provided at the connection points of the first differential pressure transmitter 11 and the second differential pressure transmitter 15 with each pressure tapping pipeline.

[0045] The ash hopper level monitoring mechanism 2 includes a first pressure transmitter 21, a third pressure tap 22, and multiple second pressure tap branches 23; one end of the third pressure tap 22 is connected to the first pressure transmitter 21, and the other end is connected in parallel to each of the second pressure tap branches 23; each of the second pressure tap branches 23 is provided with a second solenoid valve 25, and the end of the valve away from the third pressure tap 22 is used to connect to an ash hopper of a bag filter.

[0046] The ash hopper level monitoring mechanism 2 also includes a second pressure transmitter 24; the second pressure transmitter 24 is connected in parallel with the first pressure transmitter 21 and is connected to each of the second pressure branch pipes 23 through the third pressure pipe 22, so as to realize the data verification of the first pressure transmitter 21 and the second pressure transmitter 24 and to serve as backups for each other.

[0047] The installation height of the pipe opening of the second pressure-inducing branch pipe 23 on the ash hopper wall plate corresponds to the material level height that needs to be monitored.

[0048] Manual valves are respectively provided at the connection points of the first pressure transmitter 21 and the second pressure transmitter 24 with the third pressure tap 22.

[0049] The PLC control mechanism is electrically connected to the first differential pressure transmitter 11, the first pressure transmitter 21, each of the first solenoid valves 141 and each of the second solenoid valves 25.

[0050] The differential pressure signal of the bag chamber is acquired by the first differential pressure transmitter 11; multiple first pressure branch pipes 14 connected in parallel to the second pressure pipe 13 are used, each branch pipe is connected to a clean air chamber and equipped with a first solenoid valve 141; each first solenoid valve 141 is opened sequentially, and the differential pressure value of each bag chamber is acquired cyclically; when the differential pressure is >1.5 times the set value, a dust removal alarm is triggered, and when the differential pressure is <0.5 times the set value, a filter bag damage alarm is triggered; data verification and redundancy backup are achieved through the second differential pressure transmitter 15 connected in parallel.

[0051] Once all the first solenoid valves 141 are opened in sequence, the differential pressure inspection of all bag chambers of the bag filter is completed in one cycle, and then the next cycle begins, thus realizing real-time online monitoring and inspection of the differential pressure of each compartment of the bag filter.

[0052] The pressure signal of the ash hopper is acquired by the first pressure transmitter 21; multiple second pressure branch pipes 23 connected in parallel to the third pressure pipe 22 are used, each branch pipe is connected to an ash hopper and a second solenoid valve 25 is set; each second solenoid valve 25 is opened sequentially to obtain the pressure value of each ash hopper in a loop; when the pressure value is positive, an ash blockage alarm is triggered, and when the pressure value is negative, the material level is determined to be normal; data verification and redundancy backup are achieved by the second pressure transmitter 24 connected in parallel.

[0053] Once all the second solenoid valves 25 are opened in sequence, one cycle of the bag filter dust collector's ash hopper level inspection is completed, and then the next cycle begins, thus realizing real-time online monitoring and inspection of the bag filter dust hopper level.

[0054] The PLC control mechanism sends sequential opening and closing commands to the first solenoid valve 141 and the second solenoid valve 25; receives and analyzes real-time data from the first differential pressure transmitter 11 and the second pressure transmitter 24; executes the threshold comparison logic of differential pressure / material level, triggers the corresponding alarm signal; and controls the alternating operation of the compartment differential pressure inspection cycle and the ash hopper material level inspection cycle.

[0055] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A monitoring system for a bag filter, characterized in that, This includes a baghouse differential pressure monitoring system, an ash hopper level monitoring system, and a PLC control system. The differential pressure monitoring mechanism is used to cyclically acquire the differential pressure values ​​of each bag chamber; The ash hopper level monitoring mechanism is used to cyclically acquire the pressure value of each ash hopper; The PLC control mechanism is connected to the bag chamber differential pressure monitoring mechanism and the ash hopper level monitoring mechanism respectively, and is used to send opening and closing commands to the bag chamber differential pressure monitoring mechanism and the ash hopper level monitoring mechanism in sequence; it is also used to determine the generation of alarm signals based on the comparison result of the feedback differential pressure value of each bag chamber and the first threshold; it is also used to determine the generation of alarm signals based on the comparison result of the feedback pressure value of each ash hopper and the second threshold.

2. The monitoring system for a bag filter according to claim 1, characterized in that, The baghouse differential pressure monitoring mechanism includes a first differential pressure transmitter, a first pressure tap, a second pressure tap, and multiple first pressure tap branches; one end of the first pressure tap is connected to the gas inlet of the baghouse dust collector or a baghouse, and the other end is connected to the low-pressure end of the first differential pressure transmitter; one end of the second pressure tap is connected to the high-pressure end of the first differential pressure transmitter, and the other end is connected in parallel to each of the first pressure tap branches; each first pressure tap branch is equipped with a first solenoid valve, and the end of the valve furthest from the second pressure tap is connected to a clean air chamber of the baghouse dust collector.

3. The monitoring system for a bag filter according to claim 2, characterized in that, The differential pressure monitoring mechanism for the bag chamber also includes a second differential pressure transmitter; the second differential pressure transmitter is connected in parallel with the first differential pressure transmitter; the low-pressure end of the second differential pressure transmitter is connected to the first pressure tapping pipe through a pipeline, and its high-pressure end is connected to the second pressure tapping pipe through a pipeline.

4. The monitoring system for a bag filter according to claim 3, characterized in that, Manual valves are provided at the connection points of the first differential pressure transmitter and the second differential pressure transmitter with each pressure tapping pipeline.

5. The monitoring system for a bag filter according to claim 4, characterized in that, The ash hopper level monitoring mechanism includes a first pressure transmitter, a third pressure tapping pipe, and multiple second pressure tapping branch pipes; one end of the third pressure tapping pipe is connected to the first pressure transmitter, and the other end is connected in parallel to each of the second pressure tapping branch pipes; each of the second pressure tapping branch pipes is equipped with a second solenoid valve, the end of which is away from the third pressure tapping pipe is used to connect to an ash hopper of a bag filter.

6. The monitoring system for a bag filter according to claim 5, characterized in that, The ash hopper level monitoring mechanism also includes a second pressure transmitter; the second pressure transmitter is connected in parallel with the first pressure transmitter and is connected to each of the second pressure branch pipes through the third pressure tapping pipe.

7. The monitoring system for a bag filter according to claim 6, characterized in that, The installation height of the second pressure-inducing branch pipe on the ash hopper wall plate corresponds to the material level height that needs to be monitored.

8. The monitoring system for a bag filter according to claim 7, characterized in that, Manual valves are respectively provided at the connection points of the first pressure transmitter and the second pressure transmitter with the third pressure tap.

9. The monitoring system for a bag filter according to claim 8, characterized in that, The PLC control mechanism is electrically connected to the first differential pressure transmitter, the first pressure transmitter, each of the first solenoid valves, and each of the second solenoid valves.

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