KR20200025497A - Filter dust collector and Control method of bag filter pulsing of filter dust collector - Google Patents

Abstract

A filter dust collector is disclosed. The filter dust collector according to the present invention, as a filter dust collector including a chamber having a gas inlet and a gas outlet, a differential pressure gauge measuring a differential pressure between the gas inlet and the gas outlet, and a plurality of bag filters sequentially installed inside the chamber, includes: a pulsing unit supplying compressed air to the plurality of bag filters to pulse the compressed air; and a control unit controlling a redriving cycle of the pulsing unit in real time by applying a preset pulsing redriving cycle corresponding to a preset differential pressure range after comparing the measured differential pressure sensing values with a preset differential pressure range by receiving measured differential pressure sensing values of the differential pressure gauge in real time. The filter dust collector can still more prevent a decrease in filtration performance of the entire filter dust collector by detecting a differential pressure in real time to adjust a re-dedusting cycle, thereby applying the adjusted re-dedusting cycle, and can still more facilitate sensing of bag filters having abnormalities occurred therein during dedusting operation and can reduce damages or dust collection efficiency drop of the bag filters by dedusting each of the bag filters, sensing instantaneous differential pressure values, and comparing the instantaneous differential pressure values.

Description

Filter dust collector and control method of bag filter pulsing of filter dust collector

The present invention relates to a dust collector, and more specifically, to measure the change in the differential pressure to adjust the exhaust cycle, as well as to compare the instantaneous differential pressure change after exhaustion of each bag filter to detect the abnormality of the bag filter and the order and number of exhaustion thereof It relates to a bag filter pulsing control method of the bag filter and the bag filter to adjust the.

In general, the bag filter is a general name for a device for removing solid or liquid particulates present in the air. Filtering devices have been used to remove soot and dust from exhaust gases such as boilers, roasting furnaces, heating furnaces, and waste incinerators as a countermeasure against pollution, and produce large amounts of chemical powder, steelmaking, wood, cement, and other fine dust. In addition, it is used in the workshop, and in the manufacturing industry, it is installed and used for improving the quality of products by clean air in IC process, pharmaceutical process, etc.

Such filter dust collector is divided into mechanical, electrical, dry or wet depending on the operation method, and the mechanical structure (for example, gravity settling chamber, impact type dust collector, centrifugal force) is simple as long as the size of the particles to be removed is about 10 μm. Cyclone, etc.) methods may be used.

On the other hand, such a filter dust collector has a problem that the exhaustion imbalance due to the pressure loss of the filter bag and the filter bag during the inflow of contaminated air, including dust, thereby increasing the power consumption and compressed air consumption.

Specifically, in the bag filter, a plurality of bag filters are connected in series to form a row, and each row is dedusted according to a specified pulsing cycle and order.

That is, in the related art, since exhaustion has been performed in a predetermined order and cycle, it is difficult to detect an abnormal bag filter, and thus a problem that exhaustion may be excessive or insufficient. Conventionally, such a problem has led to the problem that the filter bag is damaged and the dust collection efficiency is reduced.

Republic of Korea Patent No. 10-1750021 (Registered June 16, 2017)

The present invention has been made in order to solve the above-described problems, and to measure the differential pressure change to adjust the exhaust cycle, as well as to compare the instantaneous differential pressure change after exhaustion of each bag filter to detect the abnormality of the back filter An object of the present invention is to provide a bag filter pulsing control method of a bag filter and a bag filter for controlling the number and the number of dedusting orders.

According to one aspect of the invention, a chamber having a gas inlet and outlet, a differential pressure gauge for measuring the differential pressure between the gas inlet and outlet, a filter dust collector including a plurality of bag filters sequentially installed in the chamber, a plurality of bag filters A pulsing unit for supplying compressed air to the pulsing unit; And receiving a detection value of the differential pressure gauge in real time, comparing a preset differential pressure range with a measured differential pressure detection value, and applying a preset pulsing restart period corresponding to the preset differential pressure range to adjust the redrive cycle of the pulsing unit in real time. A filter dust collector including a control unit is provided.

The re-drive cycle may be a delay time until exhaustion of the plurality of bag filters is completed once in a sequential or separate exhaustion order before the next re-execution.

The control unit may detect an instantaneous differential pressure change after the exhaustion of each of the plurality of bag filters and adjust the exhaustion order and / or the number of exhaustion of the plurality of bag filters within each cycle of exhaustion of the plurality of bag filters based on this.

The controller may be configured to determine whether each of the bag filters is equal to or different from each other after receiving the instantaneous differential pressure change after the exhaustion of each bag filter through the differential pressure gauge while the exhaustion of the plurality of bag filters is sequentially performed. When there is at least one specific bag filter, the driving of the pulsing unit may be controlled to adjust the order and number of exhaustion of the at least one bag filter.

The controller may change the pulsing order of the at least one particular bag filter having a relatively large differential pressure before another bag filter, maintain the pulsing order, increase the number of pulsing, or include both.

The controller may adjust the order and number of exhaustion of the at least one bag filter when there is at least one specific bag filter having a relatively large differential pressure even after exhaustion of the plurality of bag filters is repeated a plurality of cycles.

According to another aspect of the present invention, a chamber having a gas inlet and outlet, a differential pressure gauge for measuring the pressure difference between the gas inlet and outlet, and a bag filter pulsing of the filter dust collector including a plurality of bag filters sequentially installed in the chamber (A) sequentially exhausting a plurality of bag filters; And (b) receiving the detected value of the differential pressure gauge in real time, comparing a preset differential pressure range with a measured differential pressure detection value, and applying a preset pulsing redrive cycle corresponding to the preset differential pressure range to determine a re-drive cycle of the pulsing unit. And adjusting in real time, wherein the re-drive cycle is a delay time between the exhaustion of the plurality of bag filters through a sequential or separate exhaustion order, and before the next restart. A control method is provided.

After the step (b), after the exhaustion of each bag filter, after receiving the instantaneous differential pressure change through a differential pressure gauge, determining whether each is the same or different from each other; And (d) if there is at least one particular bag filter with a relatively high differential pressure, change the pulsing order of the at least one bag filter before another bag filter, or maintain the pulsing order and increase the number of pulsing or both. It may further comprise the step of controlling to include all.

Step (d) may be performed when at least one specific bag filter having a relatively large differential pressure exists even after exhausting the plurality of bag filters repeatedly.

According to the bag filter pulsing control method of the bag filter and the bag filter of the present invention as described above, it is possible to further prevent the reduction of the filtration performance of the bag filter by applying the re-dusting cycle by detecting the differential pressure in real time. By detecting and comparing the instantaneous differential pressure after filter exhaustion, it is possible to more easily detect a bag filter in which an abnormality occurs during the dust removal operation, and reduce breakage and deterioration of dust collection efficiency.

1 is a view showing a filter dust collector according to an embodiment of the present invention,
Figure 2 is a graph showing the appearance of the differential pressure increases with operation in the bag filter according to an embodiment of the present invention,
3 to 5 is a graph showing the variation of the air pulse period according to the measured differential pressure variation in the filter dust collector according to an embodiment of the present invention,
6 is a flowchart illustrating a method of controlling a bag filter pulsing of a bag filter according to an exemplary embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. In the drawings, like reference numerals refer to like elements.

As the filter dust collector according to the preferred embodiment of the present invention is used for an industrial plant, it is possible to further facilitate the detection of a bag filter in which an abnormality occurs during the dust removal operation, and to reduce the breakage of the bag filter and the reduction of dust collection efficiency.

Hereinafter, the present invention will be described in detail with reference to Examples.

As shown in FIG. 1, the filter dust collector 10 according to the exemplary embodiment of the present invention includes a chamber 100, a differential pressure gauge 200, a bag filter 300, a pulsing unit 400, and a controller 500. do.

The chamber 100 has an inner space and is provided with a gas inlet 110 through which gas including dust is introduced and a gas outlet 120 through which the purified gas is discharged. The differential pressure gauge 200 is provided to measure the differential pressure between the gas inlet 110 and the gas outlet 120, and the controller 500 detects the measured value of the differential pressure gauge 200 in real time.

In the chamber 100, a gas inlet chamber 130 communicating with the gas inlet 110 and a gas outlet chamber 140 communicating with the gas outlet 120 are partitioned by separate partition walls, and the gas inlet chamber 130 ) And a plurality of bag filters 300 are installed in a state covering all of the gas discharge chamber 140. In the following description and related drawings, for convenience of description (not shown), a description will be made based on the case in which ten bag filters 300 are installed, and the number of installation thereof may be increased or decreased.

The bag filter 300 filters particles such as dust in the gas introduced through the gas inlet 110 using the cloth as a filter material, and the gas introduced through the gas inlet 110 passes through the plurality of bag filters 300. After the particles are removed, the particles are discharged to the outside through the gas discharge chamber 140 and the gas discharge port 120.

As shown in FIG. 1, the pulsing unit 400 supplies compressed air to a plurality of bag filters 300 to depulsate the bag filter 300 by air pulsing the compressed air tanks 410 and respective bags. A plurality of compressed air pipes 420, a plurality of compressed air pipes 420, injection nozzles 430 provided on the compressed air pipes 420, and a plurality of compressed air pipes 420, which form a supply path so as to supply compressed air to the filter 300. It is provided in each) includes a solenoid valve 440 for opening or closing the flow path. The solenoid valve 440 is applicable to a diaphragm type solenoid valve.

In an embodiment of the present invention, the control unit 500 may control the driving of the pulsing unit 400 to reduce the damage of the bag filter and the deterioration of dust collection efficiency. Sensing can be further facilitated, which can further reduce damage to the bag filter and reduction in dust collection efficiency.

On the other hand, Figure 2 shows that the differential pressure of the chamber 100 gradually increases as bag filter exhaustion proceeds for several months.

3 to 5, the control unit 500 receives the detection value of the differential pressure gauge 200 in real time, compares the preset differential pressure ranges A, B, and C with the measured differential pressure detection value, The repulsing cycles of the pulsing portion are adjusted in real time by applying the preset pulsing recommissioning cycles P1, P2, and P3 corresponding to the set differential pressure ranges A, B, and C.

Here, the re-drive cycle (P1, P2, P3) means the delay time until the exhaustion of the 10 bag filter 300 is completed once (one cycle) as a whole through the sequential or separate exhaustion order before the next re-execution. .

Specifically, as shown in FIG. 3, the control unit 500 detects the differential pressure in real time while the 10 bag filters 300 are exhausted, and the detected differential pressure is within a setting range (for example, 50 to 100 mmAq, A). If it is determined to be present, it is possible to control the driving of the pulsing unit 400 to maintain the current initially set air pulsing re-drive cycle (for example 20 ~ 21 seconds, P1).

In addition, as shown in FIG. 4, the control unit 500 detects the differential pressure in real time during the exhaustion of the ten bag filters 300 so that the detected differential pressure exceeds 50 to 100 mmAq and another setting range (for example, If it is determined to be within 100 to 200 mmAq, B), the currently set air pulsing restart period (for example, 20 to 21 seconds, P1) is shortened to 9 to 10 seconds (P2) and maintained. The driving of the pulsing unit 400 may be controlled.

In addition, as shown in FIG. 5, the control unit 500 detects the differential pressure in real time during the exhaustion of the ten bag filters 300 so that the detected differential pressure exceeds 100 to 200 mmAq and another setting range (for example, If it is determined to be within 200 to 250mmAq, C), the currently set air pulsing restart period (for example, 9 to 10 seconds, P2) is shortened to 4 to 5 seconds (P3) and maintained. The driving of the pulsing unit 400 may be controlled.

That is, as the exhaustion of the bag filter 300 is repeated many times over a long period of time, the pressure difference between the inlet and the outlet of the chamber 100 may gradually increase due to factors such as deterioration of the performance of the bag filter 300. As the differential pressure is measured in real time and the detected differential pressure increases, the air pulsing re-drive cycle is shortened and restarted, thereby preventing the filtration efficiency of the entire dust collector from being lowered as much as possible.

In the above description, the preset differential pressure range has been described based on three cases of 50 to 100 mmAq, 100 to 200 mmAq, and 200 to 250 mmAq, but this is for convenience of description, and the preset differential pressure range may be further refined or more widely changed. Can be.

The present invention also detects a bag filter in which an abnormality occurs during bag filter exhaustion or particle attachment is more frequent than other bag filters, and adjusts the order or number of exhaustion of the specific bag filter or the order of exhaustion. By controlling both and the number of times, an additional control method is adopted to further prevent the durability of a particular bag filter and reduce the filtration efficiency of the entire dust collector.

Specifically, as shown in FIG. 6, the control unit 500 detects an instantaneous differential pressure change after exhausting each of the ten bag filters 300, that is, a total of ten instants during one cycle of bag filter exhaustion. The differential pressure change is sensed and based on this, the exhaustion order and / or the frequency of the exhaustion of the 10 bag filters 300 are adjusted within the 10 bag filter exhaustion cycles.

In more detail, the control unit 500 receives the instantaneous differential pressure change after the exhaustion of each bag filter 300 through the differential pressure gauge while the exhaustion of the ten bag filters 300 is sequentially performed. It is determined whether they are the same or different.

In this case, when the controller 500 detects that at least one of the 10 measured instantaneous differential pressures has a relatively large differential pressure, the specific bag filter 300 may have an abnormality or may have particle adhesion as compared with other bag filters. It is determined to be made more frequently and to control the driving of the pulsing unit 400 to adjust the order and number of exhaustion of the at least one particular bag filter 300.

For example, after the 10 bag filters are exhausted, the instantaneous differential pressure change is 0.001, 0.001, 0.001, 0.001, 0.003, 0.004, 0.001, 0.001, 0.001, 0.001 (unit mmAq), respectively. If the instantaneous differential pressure is different from the others, adjust the exhaustion order and the number of times of the fourth and fifth bag filters.

In the present invention, as described above, the exhaustion order of the fourth and fifth bag filters, which have a relatively large instantaneous differential pressure as compared with other bag filters, is moved forward, and the number of times is increased to increase the dust removal efficiency of a specific bag filter. The fall of dust collection efficiency can be prevented.

For example, after one cycle of exhaustion is completed, the next cycle is air pulsing in order from 1st to 10th bag filter in order of 5th, 4th, 1st, 2nd, 3rd, 6th, 7th, The order can be changed in the order of the 8th, 9th, and 10th bag filters.

In addition, after one cycle of exhaustion is completed, the order of air pulsing in order from the first to the tenth bag filter is maintained in the next cycle, and the number of air pulsing of the fourth and fifth bag filters is applied two or more times. It may be. 1st bag filter 1 time air pulsing, 2nd bag filter 1 time air pulsing, 3rd bag filter 1 time air pulsing, 4th bag filter 2 air pulsing, 5th bag filter 2 times air pulsing, 6th bag filter The order of 1 time air pulse, 7th bag filter 1 air pulse, 8th bag filter 1 air pulse, 9th bag filter 1 air pulse, 10th bag filter 1 air pulse can be applied.

In addition, the control unit may control the bag filter exhaust to include both the former (exhaust order adjustment) and the latter (adjustment number of exhaustion). Such exhaustion order and number of times can be adjusted by controlling the opening / closing order and opening degree of the plurality of solenoid valves 440 described above.

In the embodiment of the present invention, the control unit 500, at least one specific bag filter having a relatively large differential pressure as described above even after the exhaustion of the plurality of bag filter 300 is repeated a plurality of cycles at least Adjust the exhaustion order and frequency of one bag filter. Therefore, it is possible to more reliably check whether or not the specific bag filter is abnormal, and to reduce the efficiency of the dust collector.

Hereinafter, a method of controlling the back filter pulsing of the bag filter according to the embodiment of the present invention will be described.

As shown in Figure 1, Figure 6, the bag filter pulsing control method of the bag filter according to an embodiment of the present invention, the chamber 100 having a gas inlet 110 and the gas outlet 120, the gas inlet 110 The present invention relates to a bag filter pulsing of a bag filter 300 including a differential pressure gauge 200 measuring a differential pressure between the gas outlet 120 and a plurality of bag filters 300 sequentially installed in the chamber 100. Step (S100), the real-time adjustment step of the re-drive cycle of the pulsing unit 400 (S200), the step of checking the instantaneous differential pressure change after each bag filter exhausted (S300), the pulsing order and the number of adjustment step (S400).

First, the plurality of bag filters 300 are sequentially dedusted (S100).

Next, the controller 500 receives the detected value of the differential pressure gauge 200 in real time, compares the preset differential pressure range with the measured differential pressure detection value, and then applies a preset pulsing re-drive cycle corresponding to the preset differential pressure range. The re-drive cycle of the 400 is adjusted in real time (S200). Here, the re-drive cycle corresponds to a delay time after the exhaustion of the plurality of bag filters 300 is completed once in a sequential or separate exhaustion order, and before the next re-execution, and detailed description thereof will be omitted below.

Next, the control unit 500 receives the instantaneous differential pressure change after the exhaustion of each bag filter 300 through the differential pressure gauge 200, and then determines whether each is the same or different (S300).

Subsequently, when there is at least one specific bag filter 300 having a relatively large differential pressure, the controller 500 may change the pulsing order of the at least one bag filter 300 before another bag filter, or the pulsing order may be Maintain and increase the number of pulsing or control to include both (S400).

Here, step S400 may be performed when at least one specific bag filter having a relatively large differential pressure exists even after the exhaustion of the plurality of bag filters 300 is repeated at least two times.

While the invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the invention is not limited thereto, but is defined by the claims that follow. Accordingly, one of ordinary skill in the art may variously modify and modify the present invention without departing from the spirit of the appended claims.

100: chamber 200: differential pressure gauge
300: bag filter 400: pulsing unit
440: solenoid valve 500: control unit

Claims (9)

A chamber 100 having a gas inlet 110 and a gas outlet 120, a differential pressure gauge 200 for measuring a differential pressure between the gas inlet and the outlet, and a plurality of bag filters 300 sequentially installed in the chamber. As a filter dust collector,
A pulsing unit 400 for supplying compressed air to the plurality of bag filters 300 and pulsing them; And
Receive the detected value of the differential pressure gauge 200 in real time, compare the preset differential pressure range and the measured differential pressure detection value, and apply a preset pulsing re-drive cycle corresponding to the preset differential pressure range to real-time the re-drive cycle of the pulsing unit. Filter dust collector comprising a control unit 500 to adjust to. The method of claim 1,
The re-drive cycle is a filter precipitator, characterized in that the delay time until the exhaustion of the plurality of bag filter 300 is completed once through the sequential or separate exhaustion order as a whole before the next re-execution. The method of claim 1,
The control unit 500 detects an instantaneous differential pressure change after the exhaustion of each of the plurality of bag filters 300 and adjusts the exhaustion order and / or the number of exhaustion of the plurality of bag filters in each cycle of exhaustion of the plurality of bag filters based on this. Filter dust collector, characterized in that. The method of claim 3,
The control unit 500,
While the exhaustion of the plurality of bag filters 300 is sequentially performed, after receiving the instantaneous differential pressure change through the differential pressure gauge 200 after the exhaustion of each bag filter, it is determined whether they are the same or different from each other. And controlling the driving of the pulsing unit to adjust the order and number of exhausting of the at least one bag filter when at least one specific bag filter is large. The method of claim 4, wherein
The control unit 500 controls to change the pulsing order of at least one specific bag filter having a relatively large differential pressure before another bag filter, maintain the pulsing order, increase the number of pulsing, or include both. Filter dust collector, characterized in that. The method of claim 4, wherein
The controller 500 may exhaust the at least one bag filter when the at least one specific bag filter 300 having a relatively large differential pressure exists even after exhausting the plurality of bag filters 300 repeatedly. Filter dust collector, characterized in that to adjust the order, number of times. A chamber 100 having a gas inlet 110 and a gas outlet 120, a differential pressure gauge 200 for measuring a differential pressure between the gas inlet and the outlet, and a plurality of bag filters 300 sequentially installed in the chamber 100. As related to the bag filter pulsing of the bag filter comprising:
(a) sequentially dedusting the plurality of bag filters 300; And
(b) receiving the detected value of the differential pressure gauge 200 in real time, comparing a preset differential pressure range with a measured differential pressure detection value, and applying a preset pulsing re-drive cycle corresponding to the preset differential pressure range to obtain the pulsing unit 400. Adjusting the re-drive cycle in real time,
The re-drive cycle is a delay time until the exhaustion of the plurality of bag filters 300 is completed once through the sequential or separate exhaustion order as a whole before the next re-implementation. The method of claim 7, wherein
(c) after the step (b), after the exhaustion of each bag filter, after receiving the instantaneous differential pressure change through the differential pressure gauge 200, determining whether they are the same or different from each other; And
(d) if there is at least one particular bag filter 300 having a relatively large differential pressure, change the pulsing order of the at least one bag filter before another bag filter, maintain the pulsing order and increase the number of pulsing times; The control method of the bag filter pulsing, characterized in that it further comprises the step of controlling to include both. The method of claim 8,
Step (d) is performed when there is at least one specific bag filter having a relatively large differential pressure even after exhaustion of the plurality of bag filters 300 is repeated a plurality of cycles. Pulsing control method.

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