KR100682797B1 - Filter bag weight detecting device of pulse jet cleaning system - Google Patents

Abstract

A system for detecting abnormality of a filter bag type dust collector is provided to detect abnormality of a pulse jet cleaning system in the early stage using fluctuating values of dynamic loads of dust collector filter bags and easily maintain and manage the dust collector by detecting a replacement time of the filter bags. A system for detecting load of filter bags of a dust collector comprises: a tube sheet(14) which divides an inner part of a dust collector chamber into a dust collecting chamber(2) and a cleaning chamber(3), and is moved by pulsing pressure of air according to generation of the opening action of a diaphragm valve(15) due to the electrical excitation action applied to a solenoid valve(16); filter bags(4) suspended to the tube sheet; a filter bag weight detecting part for detecting weight variation values of the filter bags; a differential pressure detecting part for detecting pressure variation within the chamber; a control part(27) electrically connected to the filter bag weight detecting part and the differential pressure detecting part respectively to detect abnormality of a pulse jet cleaning system and determine a replacement time of the filter bags using the weight variation of the filter bags, and generate a corresponding indication control signal such that the pressure variation values are indicated as a differential pressure value of the dust collector by comparing and operating the pressure variation values inputted from the differential pressure detecting part; and an indicating part(29) for indicating a corresponding pressure differential value of the dust collector according to input of the indication control signal supplied from the control part.

Description

Filter Bag Load Detection Device of Dust Collector {FILTER BAG WEIGHT DETECTING DEVICE OF PULSE JET CLEANING SYSTEM}

1 is a view showing the configuration of a dust collector pulse jet cleaning system according to the prior art.

2 is a view showing the configuration of the filter bag inside the dust collector according to the prior art.

3 is an exploded perspective view showing the configuration of the filter bag load detection apparatus according to an embodiment of the present invention.

4 is a diagram illustrating a configuration in which the abnormality detection unit and the filter bag load detection unit of the pulse jet cleaning system according to the exemplary embodiment of the present invention are installed as a whole.

The present invention relates to a dust collector, and more particularly to a filter bag load detection device of the dust collector.

1 is a view showing the configuration of a dust collector pulse jet cleaning system according to the prior art, Figure 2 is a view showing the configuration of a filter bag inside the dust collector according to the prior art.

Referring to FIG. 1, in the pulse jet cleaning system according to the related art, an air hose 18 connected to a local panel (LOCAL PANEL) 21 is connected to a clean room 3 and a dust collecting chamber 2, respectively, to reduce the differential pressure of the chamber. It is configured to detect and purge through the air supply line 8, the solenoid valve 16, the diaphragm valve 15, the blow tube (BLOW-TUBE) 5, and the air injection nozzle 25 in the air header 6. There is no configuration to detect the degree and presence of the air blowing pressure. As shown in FIG. 2, the tube sheet 14 constituting the conventional dust collector is fixed to the chamber and separated from the dust collecting chamber 2 and the clean chamber 3.

As described above, according to the prior art, there is no configuration for detecting an abnormal occurrence of the pulse jet cleaning system and the replacement timing of the filter bag 4, and it is detected by the field worker. The method is as follows.

First, observe the operating states of the solenoid valve (S / V; SOLENOID VALVE), diaphragm valve (D / V; DIAPHRAGM VALVE), and regulator (REGULATOR), or clean the dust chamber and clean room (CLEAN AIR ROOM). Visually confirm the differential pressure value of the differential pressure gauge that detects the differential pressure between the two, or install a DENSITY MONITOR on the stack and watch that the alarm signal of the cab computer PC is generated. there was.

In the three methods described above, the field operator visually observes the operation of the solenoid valve, the diaphragm valve, and the regulator. In the detection method using the differential pressure gauge, it is difficult to detect abnormality of the pulsing device at an early stage because the differential pressure value of the differential pressure gauge becomes recognizable only when it becomes extremely large or small.

On the other hand, the detection method by the monitor recognizes the abnormality by visually observing the visible dust only when the filter bag is perforated and a large amount of dust is transferred to the clean room from the dust collecting chamber through the pore part and then moved to the stack. It is difficult to detect abnormality of the pulsing device at the early stage due to the fact that it can be recognized only when the detection value of the monitor (Company regulation value: POSCO standard allowance value: 40mg / ㎥) is large, and it is difficult to accurately know when to replace the filter bag. It was.

In more detail, the air jet pulsing method used as the DEDUSTING control means of the filter bag type dust collector closes the outlet damper of the dust collection chamber to block the inflow of the impregnated gas into the dust collection chamber. . In this state, the air of high pressure (4 ~ 6Kg / ㎥) produced by the compressor is adjusted to a constant pressure (set pressure: 4Kg / ㎥) in the regulator of the pressure feed pipe. Then, the electrical excitation of the solenoid valve generated by the sequential momentary purging into the filter through the diaphragm valve and through the next nozzle (NOZZLE) through the blow tube (BLOW-TUBE). At this time, the dusting action is performed in such a way that the caking (COKING, COATING) dust formed on the surface of the filter bag is removed by the pulsing shock applied to the filter bag and settles to the lower part of the dust collecting chamber.

By the way, when the dust collection and the dust collection action is alternately sequentially by chamber, the detection of the differential pressure change of the conventional dust chamber and the clean room by the calculation method and the detection means for detecting the presence or absence of abnormal operation status of the pulsing device when the dust removal action occurs. The following problems are common.

Due to the suction function of I.D FAN, dust of COKE is sucked through hood part installed at the place of oscillation source. Then, the sucked dust enters the dust collecting chamber of the dust collector through the pipe, and the dust is coated on the surface of the filter bag by the filtering action of the filter bag, and the air is discharged to the clean room and the stack. In this state, conventionally, the pressures of the dust collection chamber and the clean room were detected by a differential pressure gauge, and the change of the differential pressure was visually confirmed by the operator, and it was estimated that the filter bag was ruptured when the differential pressure became zero.

If the differential pressure reaches the maximum (MAX 300mmAq) state, the filter bag may be extremely contaminated or an abnormality such as a pulsing device (solenoid valve, diaphragm valve, regulator) may be assumed to control the dust collector all-stop. And inspection and maintenance work (including filter bag replacement).

The problem of dust collector operation method as described above can be recognized only when the differential pressure is displayed extremely, and it is difficult to detect and manage by trend management in the initial state that is converted from normal state to abnormal state. There are problems such as incurring excessive loss cost in operation.

An object of the present invention is to detect the occurrence of abnormality of the pulse jet cleaning system at the initial value by the dynamic load fluctuation value of the dust collector filter bag, the filter bag type dust collector that can detect the replacement time of the filter bag to facilitate the maintenance and management of the dust collector To provide an abnormality detection device.

In order to achieve the above object, the present invention distinguishes the dust collecting chamber and the clean room inside the dust collector chamber, and the tube is moved to the pulsing pressure of air as the opening action occurs in the diaphragm valve by the electrical excitation acting on the solenoid valve. The filter bag is suspended from the seat and tube sheet, the filter bag weight detector for detecting the weight variation of the filter bag, the differential pressure detector for detecting the pressure change in the chamber, the filter bag weight detector and the differential pressure detector, respectively, are electrically connected to the filter bag. Determination of abnormality occurrence of the pulse jet cleaning system and replacement of the filter bag using the weight change value of the filter bag input through the weight detection unit, and the pressure change value input from the differential pressure detection unit is compared and calculated to display the differential pressure value of the dust collector. A controller for generating a display control signal From it characterized in that it comprises a display unit for displaying the precipitator differential pressure value that is in accordance with the input of a display control signal supplied.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details, such as the following description and the annexed drawings, are shown to provide a more general understanding of the invention, these specific details are illustrated for the purpose of explanation of the invention and are not meant to limit the invention thereto. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

3 is an exploded perspective view showing the configuration of the filter bag load detection apparatus according to an embodiment of the present invention, Figure 4 is applied to the abnormality detection unit and filter bag load detection unit of the pulse jet cleaning system according to the embodiment of the present invention as a whole It is a figure which shows the installed structure.

Referring to Figures 3 and 4 will be described the configuration of the filter bag load detection apparatus according to an embodiment of the present invention.

An embodiment of the present invention relates to a method for detecting abnormality occurrence of a pulse jet cleaning system and determining replacement timing of a filter bag 4 based on dynamic load fluctuation values of the dust collector filter bag 4. Tube sheet 14 and tube sheet, which are moved to the pulsing pressure of air as the open action occurs in the diaphragm valve 15 due to the electrical excitation acting on the solenoid valve 16. And a filter bag weight detector for detecting a weight change of the filter bag 4 suspended from the filter 14, a differential pressure detector for detecting a pressure change in the chamber, a controller 27, and a display 29.

The filter bag weight detection unit includes a base plate 32, a load cell supporting base 41, a load cell 30, a load cell 30, a buffer member 36, a cover 39, and a filter installed in the tube sheet 14. The load cell 30 in a state in which the tube sheet 14 and the filter bag 4 can be mechanically moved up and down by the elastic force of the shock absorbing member 36 so that the weight of the bag 4 can be detected in real time. It consists of a composition that presses the pressure.

The base plate 32 is mounted in a horizontal structure in the inner dust collecting chamber 2 of the chamber, and consists of a plate-shaped plate. The load cell support base 41 is mounted on the horizontal surface of the base plate 32 and may be formed to correspond to the shape of the load cell 30. In the embodiment of the present invention, the load cell supporting base 41 is formed in a disc shape having an appropriate height. . Mounting position of the load cell support base 41 may be made through various design changes, each of which can be mounted in a vertical structure in the four corners on the horizontal surface of the base plate 32. The load cell 30 is electrically circuit-connected to the control unit 27 and mounted on the load cell support base 41 to function to substantially detect the weight variation of the filter bag 4.

Referring to FIG. 3, the load cell supporting base 41 and the base plate 32 are welded and fixed in a horizontal structure to the internal dust collecting chamber 2 of the chamber so as to detect the weight change of the filter bag 4. The load cell 30 is fixed to the vertical structure at four places of the base plates 32.

The shock absorbing member 36 is mounted on the load cell 30 and may be composed of an elastic spring. The cover 39 is mounted between the base plate 32 and the tube sheet 14 to cover the load cell 30 and the shock absorbing member 36 internally, and has a bellows shape.

That is, the load cell 30 and the buffer member 36 having a size that can be inserted into the inner diameter of the load cell 30 is mounted one by one each, and the load cell 30 and the buffer member 36 as a cover 39 having a bellows structure. Cover to be built.

In the above configuration, the filter bag weight detection unit according to the embodiment of the present invention further includes a crimping member 38 mounted on the tube sheet 14 to support the upper portion of the buffer member 36. By preventing the sheet 14 from directly touching, damage to the tube sheet 14 can be prevented. When the pressing member 38 is configured as described above, the front end of the buffer member 36 and the bottom surface of the tube sheet 14 directly contact each other, and the pressing member 38 is positioned inside the diameter of the buffer member 36. It is preferable if the structure does not interfere with each other.

On the other hand, it is formed to surround the edge of the tube sheet 14 and further comprises a sealing member 37 of a rubber material sealing between the tube sheet 14 and the chamber, the sealing member 37 is a tube sheet 14 is By flowing up and down when the pulse jet cleaning system generates a pulsing action, it is possible to prevent the pressure of the dust collecting chamber 2 and the clean chamber 3 from leaking between the tube sheet 14 and the chamber.

That is, the pressing member 38 fixed to the four corners of the bottom surface of the tube sheet 14 directly allows the tube sheet 14 to flow up and down by the buffer member 36 so that the upper end of the load cell 30 can be directly. By being able to pressurize by the load cell 30, the real time weight detection of the filter bag 4 provided by the load cell 30 to hang on the tube sheet 14 and the tube sheet 14 is possible.

At this time, when the tube sheet 14 is changed up and down, a gap GAP is formed between the chamber and a rubber that covers the entire edge of the tube sheet 14 to prevent leakage. The sealing material 37 of a material is comprised.

The differential pressure detector includes a first pressure transmitter 31, a second pressure transmitter 22, and a third pressure transmitter 23, and constitutes a structure connected to the controller 27 by a cable 28, respectively. .

The first pressure transmitter 31 is mounted to the air header 6 (AIR-HEADER) to generate a pressure fluctuation value. The second pressure transmitter 22 is mounted in the clean room 3 to generate a pressure fluctuation value. The third pressure transmitter 23 is mounted in the dust collecting chamber 2 to generate a pressure fluctuation value.

With the above configuration, when the open action occurs in the diaphragm valve 15 due to the electrical excitation acting on the solenoid valve 16, the pulsing pressure of the air acts on the inside of the filter bag 4. Control unit 27 determines whether a fluctuation value of the load cell 30 corresponding to the pressure change before and after the pulsing action is generated in the first pressure transmitter 31 of the air header 6 set in advance when the X is moved downward. Can be detected by operation and comparison.

The control unit 27 is electrically connected to the filter bag weight detection unit and the differential pressure detection unit, respectively, and detects the occurrence of abnormality of the pulse jet cleaning system and the filter bag by the weight variation value of the filter bag 4 input through the filter bag weight detection unit. It is determined that the replacement time of 4), and the pressure change value input from the differential pressure detection unit is compared and calculated to generate a corresponding display control signal to be displayed as the differential pressure value of the dust collector. The control unit 27 according to the embodiment of the present invention may be configured as a microprocessor, and may be configured as a programmable logic controller (PLC) mainly used for automatic control and monitoring of an industrial plant.

The display unit 29 displays the corresponding dust collector differential pressure value according to the input of the display control signal supplied from the control unit 27, and may be configured as a monitor of a personal computer (PC).

The control unit 27 analyzes the weight variation value of the filter bag 4 input from the filter bag weight detection unit, and determines the normal operation state of the pulse jet cleaning system when the weight change of the filter bag 4 is detected.

Then, the control unit 27 analyzes the weight change value of the filter bag 4 inputted from the filter bag weight detection unit, and if the weight change of the filter bag 4 is not detected in the state in which the pulsing action occurs, Determine the operating status as abnormal.

On the other hand, the control unit 27 calculates the difference between the total weight of the tube sheet 14 before purging the air and the total weight of the tube sheet 14 after the air purge when the pulsing action occurs, and the filter bag 4 is initially installed. The degree of contamination of the filter bag 4 over time is detected in real time by comparing and calculating the weight change generated when the pulsing action occurs.

The controller 27 determines that the filter bag 4 is replaced when the variation in the weight of the tube sheet 14 is equal to or less than the set value when the pulsing action occurs and the differential pressure value corresponds to the set pressure value.

With the above-described configuration, an embodiment of the present invention is to detect the dynamic load of the filter bag 4 inside the dust collector chamber in real time using the load cell 30 in the initial stage when the differential pressure inside the chamber is transferred from the normal state to the abnormal state. It is possible to detect the dynamic load fluctuation value of the filter bag 4 and the pressure fluctuation value of the first pressure transmitter 31 provided in the air header 6 and the second pressure transmitter 22 provided in the clean room 3. The pulse jet cleaning system of the filter bag type 4 dust collector is abnormal as a result obtained by comparing and calculating the dust collector differential pressure value obtained by the comparison value of the third pressure transmitter 23 installed in the dust collector 2 in the control unit 27. It is possible to determine the occurrence and replacement time of the filter bag (4).

The operation of the filter bag load detection device according to an embodiment of the present invention will be described.

First, when the air pressure of the air header 6 is 5kg / ㎠ (home), the pressure transmitter 31 is applied as an electrical signal to the control unit 27 that 5kg / ㎠. In this state, when the solenoid valve 16 is opened by the electrical excitation, air flows into the blow tube 5 via the diaphragm valve 15. Subsequently, through the air nozzle and introduced into the filter bag 4 through the VENTURI 24, the pulsation of the entire filter bag 4 is generated and attached to the surface of the filter bag 4 in a caking state. The dust that was present will be removed. At this time, when a pressure of 5 kg / cm 2 is introduced into the filter bag 4, the tube sheet 14 which is maintained in a state held by the buffer member 36 is generated by pressing the filter bag 4 downward. ) Is finely moved in the downward direction. Due to this, the pressing member 38 presses the load cell 30 so that the loading is detected.

As described above, when a load change is detected in the load cell 30, the controller 27 determines that the pulsing action is normally generated, that is, the pulse jet cleaning system is in a normal operating state.

If the loading change is not detected in the load cell 30 despite the above pulsing action, the control unit 27 breaks the diaphragm of the diaphragm valve 15 so that air does not flow into the blow tube 5 and leaks out of the pipeline. In other words, it is determined that the abnormality has occurred in the pulse jet cleaning system.

The control operation of the control unit 27 according to the embodiment of the present invention is not only the occurrence of abnormality detection of the pulse jet cleaning system as described above, but also the entire tube sheet 14 before purging the air at the time of the pulsing action. The weight of the entire tube sheet 14 after purging can be compared and calculated in the control unit 27. In addition, by comparing and calculating the weight change generated when the filter bag 4 is first installed and the pulsing action is generated, the degree of contamination of the filter bag 4 with time is detected in real time, and a predetermined time elapses. After that, when the pulsing action, which is a phenomenon occurring at the end of the life of the filter bag 4, occurs, the variation in weight is extremely small (when the pulsing action occurs on the surface of the filter bag 4 due to contamination of the filter bag 4). Filter bag 4 when the differential pressure value detected by the second pressure transmitter 22 and the third pressure transmitter 23 is close to 300 mmAq. Judging by the timing of replacement.

As described above, the embodiment of the present invention has a configuration in which the load cell 30 can detect a load variation value by applying high pressure (5 kg / cm 2) of air to the filter bag 4 when a pulsing action occurs. Due to this, the load generated at this time is compared and calculated by the control unit 27 with the pressure value detected by the first pressure transmitter 31 of the air header 6 to detect an abnormal phenomenon of the pulse jet cleaning system and before the pulsing action occurs. , And compares and calculates the weight change value of the subsequent tube sheet 14 and the differential pressure value change detected by the second pressure transmitter 22 and the third pressure transmitter 23 and the load change value by comparing and calculating in the control unit 27. When a slight occurrence and a differential pressure value approaching a maximum 300 mmAq state are detected by the control unit 27 as a comparison and arithmetic action, a pulse of the dust collector which generates an action that determines that the life of the filter bag 4 has expired. Jet cleats Generation and detection filters over the back fastening system (4) generates an action to be possible to recognize the replacement timing determination method.

As described above, the filter bag load detection device of the dust collector according to the present invention makes it possible to detect an abnormality of the differential pressure and the pulsing device and to detect the replacement time of the filter bag by the degree of the change in the dust weight generated on the surface of the filter bag. It is possible to make it possible to detect and to detect in the early stage when an abnormality occurs, thereby making it easy to maintain and manage the dust collector.

In addition, the efficiency of the dust collector is automatically improved by the fact that the efficiency reduction of the dust collector is generated due to the facility management by visual observation of the worker, and the efficiency of the dust collector is improved. The maintenance cost is reduced.

Claims (12)

A tube sheet that separates the dust collecting chamber and the clean chamber inside the dust collector chamber and is moved to the pulsing pressure of air as the open action is generated in the diaphragm valve by an electrical excitation acting on the solenoid valve; A filter bag suspended from the tube sheet; A filter bag weight detector for detecting a weight change of the filter bag; A differential pressure detection unit detecting a pressure change inside the chamber; The circuit bag is electrically connected to the filter bag weight detector and the differential pressure detector, respectively, and detects an abnormality occurrence of the pulse jet cleaning system and determines the replacement time of the filter bag based on the weight variation value of the filter bag input through the filter bag weight detector. A controller for generating a corresponding display control signal such that the pressure change value input from the differential pressure detector is compared and calculated to be displayed as a differential pressure value of the dust collector; And a display unit for displaying a corresponding dust collector differential pressure value according to an input of a display control signal supplied from the controller. The method of claim 1, The filter bag weight detection unit A base plate mounted in a horizontal structure in the inner dust collecting chamber of the chamber; A load cell support base mounted on a horizontal surface of the base plate; A load cell mounted on the load cell support base; A buffer member mounted on the load cell; And a cover mounted between the base plate and the tube sheet to cover the load cell and the buffer member so as to be embedded therein. The method of claim 2, The load cell support base is a filter bag load detection device of the dust collector is mounted in a vertical structure in each of the four corners on the horizontal surface of the base plate. The method of claim 2, The cover is a filter bag load detection device of a dust collector having a bellows shape. In the second, It further comprises a pressing member mounted to the tube sheet to support the upper portion of the buffer member, the pressing member directly presses the upper end of the load cell by allowing the tube sheet to be moved up and down by the buffer member Filter bag load detection device of dust collector. The method of claim 1, And a sealing member formed to surround an edge of the tube sheet to seal between the tube sheet and the chamber. The method of claim 6, The sealing member is a filter bag load detection device of a dust collector made of a rubber material. The method of claim 1, The differential pressure detection unit A first pressure transmitter mounted on the air header to generate a pressure change value; A second pressure transmitter mounted on the clean room to generate a pressure change value; Filter bag load detection device of the dust collector including a third pressure transmitter mounted on the dust chamber to generate a pressure fluctuation value. The method of claim 1, And the control unit analyzes the weight variation of the filter bag input from the filter bag weight detector and determines the operating state of the pulse jet cleaning system as normal when the weight change of the filter bag is detected. The method of claim 1, The control unit analyzes the weight variation value of the filter bag input from the filter bag weight detector to determine the operation state of the pulse jet cleaning system as an abnormal state if the weight change of the filter bag is not detected while a pulsing action occurs. Filter bag load detection device. The method of claim 1, The control unit calculates a difference between the total weight of the tube sheet before purging the air and the total weight of the tube sheet after purging the air when a pulsing action occurs, and compares the weight change generated when the filter bag is first installed and the pulsing action is generated. And a filter bag load detection device of a dust collector for calculating in real time the extent to which the filter bag is contaminated over time. The method of claim 11, The control unit is a filter bag load detection device of the dust collector for determining when the change in the tube sheet weight is less than the set value when the pulsing action occurs, and the differential pressure value corresponds to the set pressure value.

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