KR20150089222A

KR20150089222A - Apparatus for controlling dust collector

Info

Publication number: KR20150089222A
Application number: KR1020140009582A
Authority: KR
Inventors: 김성완
Original assignee: 김성완
Priority date: 2014-01-27
Filing date: 2014-01-27
Publication date: 2015-08-05

Abstract

A control device for the dust collector is provided. The control device of the dust collector includes a guide tube provided in the suction pipe of the dust collector, a pressure gauge measuring the pressure of the guide pipe, a pressure of the suction pipe calculated from the measured pressure of the guide pipe, It is possible to stably measure the suction pipe pressure of the dust collector for a long period of time by controlling the blowing amount of the exhaust gas flowing into the suction pipe so as to follow the suction pipe. By forming the induction pipe so as to have a curvature or a spiral, So that it can be prevented from flowing into the induction pipe.

Description

[0001] APPARATUS FOR CONTROLLING DUST COLLECTOR [0002]

The present application relates to the control of a dust collector.

In large-scale dust emission plants such as thermal power plants and sinter plants, dust collectors are essential. In recent years, there is a tendency that regulations on dust concentration and fine dust are strengthened, and therefore, there is an increasing need to improve the dust collecting efficiency of a dust collector, and there is a need for efficient dust collector control for reducing power usage.

That is, when the dust collector is initially installed or at the initial stage of the bag filter replacement, the flow resistance is low due to low flow resistance when the dust collector passes through the dust collector. However, when the dust collector is deteriorated or deteriorated, In this case, the flow rate decreases due to the increase in the resistance to the flow.

Therefore, it is very important to maintain a proper air flow rate in order to reduce the operation cost of the dust collector (that is, to improve the efficiency of the used electric power), and there is a method of maintaining the pressure of the dust collector suction pipe at a predetermined proper pressure as a method for maintaining proper air flow.

In order to keep the pressure of the suction pipe of the dust collector constant, it is necessary to measure the pressure of the suction pipe of the dust collector. However, due to dust or foreign matter mixed in the exhaust gas (suction gas) sucked into the suction pipe, There is a problem that measurement is difficult in practice.

According to one embodiment of the present invention, there is provided a control device for a dust collector capable of stably measuring a suction pipe pressure of a dust collector for a long time and preventing foreign matter such as rainwater from flowing into the guide pipe.

According to an embodiment of the present invention, there is provided a dust collecting apparatus comprising: a guide pipe provided in a suction pipe of a dust collector; A pressure gauge for measuring the pressure of the induction pipe; And a control unit for calculating the pressure of the suction pipe from the measured pressure of the induction pipe and controlling the blowing amount of the exhaust gas flowing into the suction pipe such that the pressure of the calculated suction pipe follows a preset reference pressure.

According to one embodiment of the present invention, a separate induction pipe is provided in the suction pipe of the dust collector, and the pressure of the suction pipe of the dust collector can be stably measured for a long time by calculating the pressure of the suction pipe from the pressure of the induction pipe.

Further, according to another embodiment of the present invention, the induction tube is formed to have a curvature in a curved shape, a spiral shape, or the like, so that foreign matter such as rainwater can be prevented from flowing into the induction tube.

1 is a configuration diagram of a control device of a dust collector according to an embodiment of the present invention.
Fig. 2 is a view showing an installation position of a guide pipe and a pressure gauge according to an embodiment of the present invention.
3 is a configuration diagram of a control device of a dust collector according to another embodiment of the present invention.
4 is a view showing the shape of a guide pipe according to an embodiment of the present invention.
5 shows a valve installed between a guide tube and a pressure gauge according to one embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. The shape and the size of the elements in the drawings may be exaggerated for clarity and the same elements are denoted by the same reference numerals in the drawings.

Fig. 1 is a block diagram of a control device for a dust collector according to an embodiment of the present invention. Fig. 1 is a block diagram of a control device for a dust collector according to the embodiment of the present invention. The control device of the dust collector includes a guide tube, And a control unit for calculating the pressure of the suction pipe from the pressure and controlling the blowing amount of the exhaust gas flowing into the suction pipe so that the pressure of the calculated suction pipe follows a preset reference pressure.

1, the dust collector includes a suction pipe 11 for sucking exhaust gas and delivering it to the dust collecting module 10, a dust collecting module 10 for removing foreign matter such as dust from the exhaust gas sucked through the suction pipe 11, A blower 140 for controlling the amount of exhaust gas sucked into the suction pipe 11 and discharged through the discharge pipe 12, and a discharge pipe 12 for discharging the exhaust gas from which the foreign substances are removed by the dust collecting module 10, Damper 130 may be included.

A pressure gauge 110 for measuring the pressure of the induction pipe 100 and the induction pipe 100 may be installed on one side of the suction pipe 11 of the dust collecting module 10.

2 is a view showing the installation positions of the induction pipe and the pressure gauge according to one embodiment of the present invention.

2, the induction pipe 100 may have a predetermined length L and may be vertically installed on one side of the induction pipe 11, and may have a predetermined length L from the upper portion of the induction pipe 100, A pressure gauge 110 may be installed at a point. Here, the internal pressure of the suction pipe 11 is denoted by Pin, and the pressure in the atmosphere is denoted by Po.

Hereinafter, the principle of operation of the controller of the dust collector according to the embodiment of the present invention will be described in detail with reference to FIG. 1 and FIG.

1 and 2, the pressure gauge 110 installed in the induction pipe 11 measures the pressure P in the induction pipe 11 after measuring the pressure P in the induction pipe 11, To the control unit 120.

The control unit 120 can calculate the pressure Pin of the suction pipe 11 from the pressure P of the induction pipe 100 measured by the pressure gauge 110 according to the following equation.

[Equation 1]

Pin = (L / l) x P

Where Pin is the pressure of the suction pipe, L is the total length of the induction tube, l is the distance from the top of the induction tube to the point where the pressure gauge is installed, and P is the pressure of the induction tube measured in the pressure gauge.

The above-described equation (1) may be derived from the following equation (2).

&Quot; (2) "

P = (Pin - Po) x (1 / L)

Where P is the pressure of the induction tube measured in the pressure gauge, Pin is the pressure of the suction tube, Po is the atmospheric pressure, L is the total length of the induction tube, and l is the distance from the top of the induction tube to the point where the pressure gauge is installed. For simplicity, Po is set to 0, but it is also possible to set it to a non-zero value.

Since the distance l from the total length L of the induction pipe to the point where the pressure gauge is installed from the upper portion of the induction pipe is a constant in Equation 1, the pressure Pin of the suction pipe and the pressure It can be seen that the measured pressure P of the induction pipe 100 is a linear or proportional relationship and the pressure Pin of the suction pipe can be more accurately predicted through proper calibration.

Next, the control unit 120 can control the blowing amount of the exhaust gas flowing into the suction pipe 11 so that the pressure of the calculated suction pipe 11 follows the preset reference pressure.

Specifically, the control unit 120 obtains the pressure error between the reference pressure and the calculated suction pipe 11, and then controls the amount of opening of the damper 130 installed in the discharge pipe 12 so that the pressure error becomes zero, The blowing amount of the exhaust gas flowing into the suction pipe 11 can be controlled. It should be noted that the control unit 120 may be implemented by various control algorithms such as proportional (P) control, proportional-differential (PD) control, and proportional-derivative integral (PID) control.

3 is a configuration diagram of a control device of a dust collector according to another embodiment of the present invention. 1, a motor 150 for controlling the blowing amount of the blower 140 and a variable speed drive (VSD) 151 for controlling the speed of the motor 150 are further included.

3, the controller 120 obtains the pressure error between the reference pressure and the pressure of the intake pipe 11 calculated above, and then outputs the pressure error to the motor (not shown) through the variable speed drive 151 The blowing amount of the exhaust gas flowing into the suction pipe 11 can be controlled by controlling the blowing amount of the blower 140 through the speed control of the blower 150. Here, the amount of opening of the damper 130 may be kept at the maximum (that is, opened) as shown in Fig. The variable speed drive unit 151 described above may be implemented by, for example, an inverter.

3, the speed of the motor 150 is controlled on the assumption that the amount of opening of the damper 130 is in the open state. However, the present invention is not limited to this, ) And the amount of opening of the damper 130 may be appropriately mixed and controlled.

4 is a view showing the shape of a guide tube according to an embodiment of the present invention.

As shown in Fig. 4 (a), the induction tube 100 may have a curved shape or may be realized in a spiral shape as shown in Fig. 4 (b).

2, foreign matter such as rainwater may flow into the induction pipe 100 when the induction pipe 100 is in a straight line. In this case, the induction pipe 100, as measured by the pressure gauge 110, The pressure within the chamber may become inaccurate.

Therefore, according to the embodiment of the present invention, the induction pipe 100 is formed in a curved shape (see FIG. 4A) or a spiral shape (see FIG. 4B) Can be prevented from flowing into the induction tube 100, so that the pressure in the induction tube 100 can be accurately measured.

Meanwhile, FIG. 5 shows a valve installed between the induction pipe and the pressure gauge according to an embodiment of the present invention.

5, according to one embodiment of the present invention, a flow path changing valve 500 for changing the flow of air is provided between the pressure gauge 110 and the induction pipe 100, And a shut-off valve 510 for shutting off the exhaust gas.

5 (a), the flow path changing valve 500 is connected to the pressure gauge 110 and the induction pipe 100, and the shutoff valve 510 is connected to the induction pipe 100, So that the dust collector can be controlled in the same manner as described in Figs. 1 to 3 in the state as shown in Fig. 5 (a).

5 (b) is for calibration, in which the flow path changing valve 500 is connected to the pressure gauge 110 in a direction connecting the induction pipe 100, And can be operated so as to be blocked so as not to flow into the tube 100.

That is, according to the embodiment of the present invention, since it is practically difficult to measure the pressure of the suction pipe 11 stably for a long time, the pressure (P) of the suction pipe 11 An error may be generated between the pressure of the suction pipe 11 obtained indirectly and the pressure of the actually measured suction pipe 11. [

In order to reduce the above-mentioned error, the flow path changing valve 500 and the shut-off valve 510 are made into a state as shown in FIG. 5 (b), and then the pressure is measured through the pressure gauge 110. The pressure of the pressure gauge 110 measured in this way may be the actual pressure of the suction pipe 11. Thereafter, an error between the actual pressure of the suction pipe 11 and the pressure of the suction pipe 11 measured indirectly in the state as shown in FIG. 5 (a) can be obtained and used for calibration.

Meanwhile, FIG. 5 (c) is for removing foreign substances or the like when they are introduced into the induction pipe 100. That is, the flow path changing valve 500 is opened in a direction connecting the induction pipe 100 and the compressed air 520, and the shutoff valve 510 is opened in the state where the atmospheric air can be introduced into the induction pipe 100 . Thereafter, the compressed air 520 may be introduced into the induction pipe 100 to remove foreign substances in the induction pipe 100.

As described above, according to the embodiment of the present invention, it is possible to stably measure the suction pipe pressure of the dust collector for a long time by providing a separate induction pipe in the suction pipe of the dust collector and calculating the pressure of the suction pipe from the pressure of the induction pipe .

The present invention is not limited to the above-described embodiments and the accompanying drawings. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be self-evident.

10: dust collecting module 11: suction pipe
12: discharge pipe 100: guide pipe
110: pressure gauge 120:
130: damper 140: blower
150: motor 151: variable speed drive
500: Flow change valve 510: Shutoff valve

Claims

An induction pipe provided in the suction pipe of the dust collector;
A pressure gauge for measuring the pressure of the induction pipe;
And a control unit for calculating the pressure of the suction pipe from the measured pressure of the induction pipe and controlling the blowing amount of the exhaust gas flowing into the suction pipe so that the pressure of the calculated suction pipe follows a preset reference pressure.