KR102129120B1 - A swirling flow device having airfoil shaped vanes - Google Patents

Abstract

The present invention relates to a swirling flow device equipped with a vane of the airfoil, the present invention in one embodiment the swirling flow device for collecting harmful particles in the processing gas, the case of a cylindrical shape into which the processing gas flows; A central axis located inside the case; And located on the outer circumferential surface of the central axis, including at least one vane of the airfoil (Airfoil) for generating a swirl flow (Swirl flow), the upper end of the vane is rotated, it is possible to adjust the angle at which the processing gas enters the vane By providing the orbiting flow device, it is possible to improve the turning performance while minimizing the pressure drop between the inlet of the case where the process gas flows in and the outlet of the case where the process gas flows out, thereby collecting harmful particles. It has the advantage of maximizing performance.

Description

A swirling flow device having airfoil shaped vanes

The present invention relates to a swirling flow device that collects harmful particles including fine dust, and, in particular, provides a swirling flow device equipped with an airfoil vane to minimize pressure drop, thereby reducing thermal efficiency. It relates to a swing flow device that can not only improve, but also improve the performance of collecting harmful particles by increasing the swing performance.

As the movement to prevent environmental pollution is progressing worldwide, it is also required in Korea to install pollutant discharge charges, install pollution prevention facilities, and comply with pollutant emission standards.

As such, environmental regulations on pollutant emissions have been strengthened, which has greatly influenced the operation of pollutant emission facilities such as automobiles and power plants. As an example, after a preventive maintenance plan (Overhaul, Overhaul) that is periodically implemented in a combined cycle power plant. ) Since the iron oxide particles emitted during the initial operation may cause environmental and human damage to the surrounding area, it is necessary to install a facility capable of collecting pollutants.

A device capable of collecting such contaminants is called a'dust collection device', and the dust collection device specifically serves to separate and collect dust and mist from the processing gas.

According to the method of collecting particles, the dust collecting device uses gravity to collect harmful particles, the inertial force collecting device to collect harmful particles using inertial force, and resonates suspended particles present in the gas using sound waves to cause harmful particles Is a sound wave dust collecting device, a cleaning dust collecting device that collects by spraying water on dusty substances in a gas, a filter dust collecting device that collects harmful particles by passing gas through a filter medium, and an electric dust collecting device that collects harmful particles by using electrostatic separation It is divided into a back, and among them, a rotating flow device that rotates harmful particles using a turning force and drives harmful particles to a wall through centrifugal force to collect them is the most representative device.

However, in the conventional orbiting flow device, as the vane rotates as the vane has a flat plate shape, as the angle of the vane approaches horizontal, flow separation occurs at the rear end of the vane. There is a problem in that the thermal efficiency of a turbine of a thermal power plant is greatly reduced due to a large pressure drop, and thus, a new orbiting flow device capable of solving this problem is required.

Korean Registered Patent Publication (Registration No.: 10-1653393) “Hybrid Dust Collector”

In the swing flow device of the present invention, the vane is divided into an upper vane and a lower vane, and when the swing flow device is first operated, the swirl flow is developed by rotating the upper vane in a horizontal direction to collect harmful particles, and other than the initial operating time It is intended to solve the problems of the conventional swing flow device by minimizing pressure drop by rotating the top vane in the vertical direction.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary knowledge in the technical field to which the present invention belongs from the following description. will be.

In order to solve the above problems, the present invention is an orbiting flow device for collecting harmful particles in the processing gas in one embodiment, the case of a cylindrical shape into which the processing gas flows; A central axis located inside the case; And located on the outer circumferential surface of the central axis, including at least one vane of the airfoil (Airfoil) for generating a swirl flow (Swirl flow), the upper end of the vane is rotated, it is possible to adjust the angle at which the processing gas enters the vane It provides a swing flow device, characterized in that.

Here, a plurality of slits are formed on the outer peripheral surface of the case.

In addition, a head portion having a curved shape in a downward direction when viewed from the side is formed at the lower end of the central axis, and the head portion is capable of guiding the flow direction of the processing gas in the vane direction.

In addition, in the swing flow device according to an embodiment of the present invention, the vane is composed of an upper vane and a lower vane, and the upper vane and the lower vane are connected by a joint, so that a relative rotational motion between the upper vane and the lower vane is achieved. Characterized as possible.

At this time, a plurality of rotating shafts are formed on the outer circumferential surface of the central shaft, and the rotating shaft penetrates the upper vane, so that the upper vane and the central shaft are connected to the rotating shaft, and the lower vane is fixed to the upper vane. Only it is characterized in that it can be rotated by the rotation of the rotating shaft.

In addition, one end of the rotating shaft penetrating the upper vane is connected to the vane rotating motor located outside the case, it is characterized in that the rotating shaft can be rotated by the driving force generated by the vane rotating motor.

In addition, the upper vane can be rotated at an angle of 40 to 90° relative to the horizontal.

In addition, the orbiting flow device according to an embodiment of the present invention is characterized in that when collecting harmful particles from the process gas, the orbital flow can be strengthened by rotating the upper vane in a horizontal direction.

The present invention divides the vane into an upper vane and a lower vane, and rotates the upper vane in a state where the lower vane is fixed, thereby providing a swinging flow device capable of adjusting the angle at which the flow enters the vane, thereby minimizing the occurrence of flow separation. have.

Through this, the pressure drop between the inlet of the case where the process gas flows in and the outlet of the case where the process gas flows out can be minimized, thereby minimizing the influence on the turbine efficiency of the power plant where the orbiting flow device is installed. In addition, when collecting harmful particles, it has the advantage of improving the turning power and maximizing the performance of collecting harmful particles.

1 is a perspective view showing a swing flow device having a vane structure of an airfoil according to an embodiment of the present invention.
2 is a view showing that the central axis constituting the swing flow device of the present invention and a plurality of vanes are connected by a rotation axis.
3 is a view showing a vane rotation motor located outside the case and capable of adjusting a rotation angle of an upper vane by rotating a rotation axis.
4 is a view showing a process in which the top vane rotates in the horizontal direction while the bottom vane is fixed.
5 (a) is a view showing the degree of flow separation as the processing gas enters the vane in a conventional orbiting flow device having a flat plate vane, and FIG. 5 (b) is a pivoting vane of the present invention It is a view showing the degree of flow separation as the process gas enters the vane in the flow device.
6 is a graph comparing the difference in swirl number according to the vane angle of the conventional flat vane and the vane vane of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings. It should be noted that the same components in the drawings are denoted by the same reference numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention are omitted.

When a component is referred to as being connected to or connected to another component, it should be understood that other components may exist in the middle, although they may be directly connected or connected to the other component. In addition, when it is said that a member is located "on" another member throughout this specification, this includes not only the case where one member is in contact with the other member but also another member between the two members.

In this application, "includes." Or "take it." Terms such as intended to designate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, one or more other features or numbers, steps, operation, component, part, or It should be understood that the possibility of the presence or addition of these combinations is not excluded in advance.

Hereinafter, a gas containing harmful particles generated during a power generation process in a thermal power plant or the like is referred to as a'treatment gas'.

First, prior to the description of the present invention, a brief description will be given of a conventional swing flow device.

The swirling flow device is a type of dust collecting device installed on a chimney of a power plant, and collecting harmful particles in a process gas by using a swirl flow generated by rotation of a vane.

However, the vane of the conventional orbiting flow device has a flat plate shape as shown in FIG. 5(a), which will be described later, so that as the angle between the vane and the horizontal line decreases, the angle (incident angle) at which the processing gas enters the vane increases, resulting in flow separation at the rear end of the vane. (Flow separation) has occurred largely, and the larger the flow separation, the greater the pressure drop (Pressure drop) value, there is a problem that can adversely affect the power generation efficiency of the power plant is installed orbiting flow device.

At this time, the pressure drop means the difference between the pressure when the process gas flows into the case and the pressure when it flows out of the case, and the higher the pressure drop value, the lower the thermal efficiency becomes, so the efficiency of the turbine used in the power plant is reduced. Will fall.

Accordingly, the present invention seeks to solve the above problems of the conventional flat plate-shaped vane by providing a swing flow device provided with a vane of airfoil.

Hereinafter, with reference to Figures 1 to 2 will be described in detail with respect to the swing flow device equipped with a vane of the airfoil according to an embodiment of the present invention.

1 is a perspective view showing a swing flow device having a vane structure of an airfoil according to an embodiment of the present invention. 2 is a view showing that the central axis constituting the swing flow device of the present invention and a plurality of vanes are connected by a rotation axis.

The present invention in one embodiment in a swirling flow device for collecting harmful particles in the processing gas,

A cylindrical case 100 through which the processing gas flows; A central axis 200 located inside the case; And it is located on the outer circumferential surface of the central axis 200, it provides a swing flow device including at least one vane 300 of the airfoil (Airfoil) for generating a swirl flow (Swirl flow).

At this time, the upper end of the vane 300 is rotated, it is characterized in that it is possible to adjust the angle at which the processing gas enters the vane 300. However, a detailed description of the contents of adjusting the incident angle of the processing gas by rotating the upper end of the vane 300 will be described later.

Looking specifically at the elements constituting the orbiting flow device according to an embodiment of the present invention, first, the cylindrical case 100 is a place where the processing gas containing harmful particles flows out.

More specifically, iv) after the treatment gas is introduced through the bottom of the case 100, ii) when harmful particles are removed through the orbiting flow generated by the vane 300 to be described later, to the top of the case 100 Again, the gas from which the harmful particles have been removed flows out of the case 100.

Here, a plurality of slits (110) on the outer circumferential surface of the case (100) are formed radially with respect to the central axis (200), and harmful particles may be collected through the slits (110).

Specifically, harmful particles such as fine dust inside the processing gas are classified into the inside of the case 100 by the swirling flow, and the harmful particles classified inside the case 100 are of the case 100 as shown in FIG. 1. It goes out of the case 100 through the slit 110 formed on the outer circumferential surface.

Although not shown on FIG. 1, the outer wall is formed around the slit 110, and harmful particles that come out of the case 100 through the slit 110 collide with the outer wall (not shown) and fall to the bottom to be collected. do.

At this time, the plurality of slits 110 is preferably formed at regular intervals as shown in FIG. 1 in terms of efficiency of collecting harmful particles, but is not limited thereto, and the interval between each of the slits 110 is different. It doesn't matter.

Next, looking at the central axis 200, the central axis 200 is located in a fixed state in the center of the cylindrical case 100, a plurality of rotating shafts 330 on the outer circumferential surface of the central axis 200 This is formed, the rotary shaft 330 may pass through a portion (upper part) of the vane 300, the vane 300 and the central axis 200 may be interconnected via the rotary shaft 330.

As the processing gas flows in the direction of the vane 300 connected to the central axis 200, a swirl flow occurs, and harmful particles inside the processing gas are generated on the outer circumferential surface of the aforementioned case 100 by the swirling flow. It can be collected by the formed slit 110.

In addition, a head portion 210 having a shape curved in a lower direction when viewed from the side (that is, a'U' shape) is formed at a lower side of the central axis 200, and the head portion 210 is the central axis It is characterized by being integrally coupled with (200).

The head portion 210 is formed to be curved in an'U' shape, and by guiding the flow direction of the processing gas to the vane 300 direction, it can help to generate a swirling flow in the vane 300.

Next, the vanes 300 which are the most essential components in the swing flow device of the present invention will be described with reference to FIGS. 3 to 4.

3 is a view showing a vane rotation motor located outside the case and capable of adjusting a rotation angle of an upper vane by rotating a rotation axis. 4 is a view showing a process in which the top vane rotates in the horizontal direction while the bottom vane is fixed.

The plurality of airfoil shaped vanes 300 constituting the orbiting flow device of the present invention are arranged at regular intervals on the outer circumferential surface of the central shaft 200 to serve to generate orbiting flow.

At this time, in FIGS. 1 to 3, 20 vanes 300 are arranged on the outer circumferential surface of the central axis 200, but the present invention is not limited thereto. 300) may be different.

It is composed of the upper vane 310 and the lower vane 320, as shown in Figure 4, the upper vane 310 and the lower vane 320 is not shown, but connected by a joint, the upper vane 310 and Relative rotational movement between the lower vanes 320 is possible.

Here, iii) the exact meaning of the expression'a relative rotational motion is possible between the upper vane 310 and the lower vane 320' is shown in FIG. 4 (a), (b), (c). 320) means that only the upper vane 310 can be rotated clockwise or counterclockwise in a fixed state, and the expression ii)'the upper end of the vane 300 rotates' is also accurate. It means that the top vane 310 constituting the vane 300 rotates.

In this case, in FIG. 4, only the process in which the upper vane 310 rotates in the clockwise direction is illustrated, but is not limited thereto, and the upper vane 310 may rotate in the counterclockwise direction as opposed to FIG. .

Looking in detail about the process of the upper vane 310 is rotated, as shown in Figures 2 to 4, each of the upper vane 310 and the central axis 100 inside the case 100 is connected to the rotating shaft 330, More specifically, by rotating the inside of the upper vane 310, the upper vane 310 and the rotating shaft 330 can rotate together, and the upper vane 310 and the central axis ( 200) may be connected via the rotating shaft 330.

The rotation shaft 330 penetrating the upper vane 310 may rotate by a driving force generated from a plurality of vane rotation motors 340 positioned outside the case 100 as shown in FIG. 3.

Specifically, a plurality of vane rotation motors 340 corresponding to the number of vanes 300 are located outside the case 100, and the rotation axis and the rotation axis 330 of the vane rotation motor 340 are located. In this connection, the rotation shaft 330 may rotate by the driving force generated by the vane rotation motor 340.

At this time, in order to connect the rotating shaft 330 and the vane rotating motor 340, it is preferable that the vane rotating motor 340 is disposed at a position corresponding to the vane 300 inside the case 100.

In addition, since the rotating shaft 330 penetrates the upper vane 310 and is connected to the central shaft 200, when the rotating shaft 330 rotates, the upper vane 310 also rotates the rotating shaft 330. It rotates clockwise or counterclockwise by an angle.

That is, the first vane is rotated by the driving force supplied from the first vane rotating motor, the second vane is the driving force supplied from the second vane rotating motor, and the nth vane is the nth vane rotating motor (n is a natural number). It is rotated by the multiplied driving force.

At this time, the control unit (not shown) may individually rotate the plurality of vane rotation motors 300 to rotate the plurality of vanes 300 (obviously, the upper vane) by the same angle. Therefore, each vane 300 may be rotated to have a different angle.

In addition, the upper vane 310 may be rotated at an angle of 40 to 90° to enhance the strength of the turning flow or to adjust the pressure drop value.

Specifically, the 40 to 90° angle means the angle between the horizontal lines of the upper vane 310 and the lower vane 320, and iv) means that the upper vane 310 is rotated at a 90° angle. ) Means that the upper vane 310 and the lower vane 320 are arranged in a straight line, and ii) the upper vane 310 is rotated at a 40° angle, as shown in FIG. 4(c), the lower vane 320 is It means that only the top vane 310 was rotated clockwise (or counterclockwise) in a fixed state.

Lastly, with reference to FIGS. 5 and 6, the advantages of the swing flow device of the present invention that are different from the conventional swing flow device will be described.

Figure 5 (a) is a view showing the degree of flow separation occurs as the processing gas enters the vane in a conventional orbiting flow device having a flat plate vane, Figure 5 (b) is a swing having a vane vane of the present invention It is a view showing the degree of flow separation as the process gas enters the vane in the flow device.

In addition, Figure 6 is a graph comparing the difference of the swirl number according to the vane angle (Vane angle) of the conventional flat vane and the vane vane of the present invention.

At this time, FIGS. 5(a) and 5(b) show the degree to which flow separation occurs under the same condition where the angle at which the processing gas is incident on the vane, and the vane angle is shown at the top of FIG. As described above, the angle between the vane and the horizontal line based on the horizontal line (the present invention means an angle between the upper vane and the horizontal line).

Unlike the vane of the conventional flat plate shape, the vane 300 of the present invention is not only formed in an airfoil, but can rotate only the upper vane 310 while the lower vane 320 is fixed, so that the rear end of the vane 300 It has the advantage that it can minimize the occurrence of flow separation in the.

Specifically, when the processing gas flows into the conventional flat plate-shaped vane, flow separation occurs largely at the rear end of the vane as shown in Fig. 5(a), but when the vane of the airfoil is used as in the present invention, Fig. 5 (b As shown in ), it can be seen that the flow rate of the processing gas is accelerated at the rear end of the vane to reduce the flow separation.

At this time, the front end of the vane means the portion where the process gas and the vane first contact (the lower vane area in the present invention), and the rear end of the vane means the opposite part of the front end.

The pressure drop value increases as flow separation occurs significantly, and as mentioned above, when the pressure drop increases, the overall efficiency of the power plant in which the swing flow device is installed decreases, and the pressure drop generated in the swing flow device is 500 Pa. It is important to keep it below.

That is, the swing flow device of the present invention can minimize the occurrence of flow separation under the same conditions (the angle at which the treatment gas enters the vane) through the vane 300 as described above, thereby increasing the efficiency of the swing flow device. Can.

In addition, in FIG. 6, it can be seen that the vane of the conventional flat plate shape and the vane 300 of the airfoil of the present invention have different swirl numbers even at the same vane angle.

Swirl number (S) is an index indicating the performance of the swinging flow device, and the angular momentum momentum in the turning direction compared to the axial momentum as in Equation 1 below is called the swirl number.

Equation (1)

The Swirl Number and the turning power are proportional, and the larger the S, the stronger the turning power, which means that harmful particles can be collected more efficiently.

Looking at Figure 6, when the vane angle is close to 90°, the top vane 310 and the bottom vane 320 are arranged in a straight line to resemble a flat shape, so the vane of the flat shape and the swivel of the vane 300 of the present invention Although there is little difference in number, it can be seen that the difference in turning force increases as the vane angle decreases.

That is, the swing flow device of the present invention has a higher swirl number compared to the conventional swing flow device at the same vane angle through the vane 300 of the airfoil, so that it can be confirmed that the turning force is higher, and the result is the same. It originated from the difference in flow separation occurring at the rear end of the vane as shown in FIG. 5.

In summary, the present invention provides a vane 300 having an airfoil type that can rotate the upper vane 310, iv) to reduce the occurrence of flow separation, thereby minimizing the occurrence of pressure drop under the same vane angle condition. Ii) Under the same pressure drop condition (for example, a condition that should be less than or equal to 500 Pa), the vane angle can be lower than that of the conventional orbiting flow device, thereby maximizing the turning performance.

The swing flow device of the present invention utilizes the above-mentioned characteristics, and iv) rotates the upper vane 310 in the horizontal direction when the swing flow device including most harmful particles is first driven (the vane angle is 40° to 50°). Rotating as much as possible to develop a swirl flow to improve the performance of collecting harmful particles, and ii) Since the harmful particles are rarely included in the processing gas at times other than the initial driving time, the upper vane 310 is vertically positioned. By rotating in the direction to minimize the pressure drop (Pressure drop) to maintain the efficiency of the power plant, it is possible to efficiently drive the swing flow device.

In summary, the present invention develops a swirling flow by rotating the top vane at an angle where the swirl number is the maximum when trapping harmful particles, and when the trapping of the harmful particles ends, the pressure is lowered by rotating the top vane again vertically. Since it is possible to minimize the occurrence of, it has the advantage of minimizing the impact on the power plant where the orbiting flow device is installed, while improving the performance of collecting harmful particles such as fine dust.

In the above, preferred embodiments and application examples of the present invention have been shown and described, but the present invention is not limited to the specific embodiments and application examples described above, and the present invention without departing from the gist of the present invention claimed in the claims. Of course, various modifications can be implemented by a person having ordinary knowledge in the technical field to which this belongs, and these modifications should not be individually understood from the technical idea or prospect of the present invention.

In addition, the terms used in the present invention are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

The scope of protection of the present invention should be interpreted by the claims below, and all technical ideas within the equivalent range should be interpreted as being included in the scope of the present invention.

100: case
110: slit
200: central axis
210: head
300: vane
310: top vane
320: bottom vane
330: rotating shaft
340: vane rotating motor

Claims (8)

In the swing flow device for collecting harmful particles in the processing gas,
A cylindrical case into which the processing gas flows;
A central axis located inside the case; And
Located on the outer circumferential surface of the central axis, including a plurality of airfoil (Airfoil) vanes for generating a swirl flow (Swirl flow),
The plurality of vanes is composed of a lower vane located upstream and an upper vane located downstream based on the flow direction of the processing gas,
The upper vane and the lower vane are connected by a joint to enable relative rotational movement,
The lower vane gradually increases in cross section from upstream to downstream, and the upper vane gradually decreases in cross section from upstream to downstream.
On the outer circumferential surface of the central axis, a plurality of rotation shafts are provided through each of the plurality of upper vanes and connected to the central axis, and only the upper vane can be rotated along the rotation of the rotation shaft while the lower vane is fixed.
The plurality of rotating shafts are connected to a plurality of vane rotating motors, the other end of which is located outside the case,
When any one of the plurality of vane rotating motors rotates, one or more upper vanes connected to the rotating vane rotating motor by a rotating shaft rotates, thereby making it possible to adjust the angle at which the processing gas enters the vane. .
According to claim 1,
Swivel flow device, characterized in that a plurality of slits are formed on the outer peripheral surface of the case
According to claim 1,
At the bottom of the central axis, a head portion having a shape curved in the bottom direction when viewed from the side is formed,
The head portion is a swirling flow device, characterized in that it can guide the flow direction of the processing gas in the vane direction
delete delete delete According to claim 1,
The top vane is a pivoting flow device, characterized in that rotating at an angle of 40 to 90° relative to the horizontal
According to claim 1,
When collecting harmful particles from the processing gas, the orbiting flow device is characterized in that it is possible to strengthen the orbiting flow by rotating the upper vane in the horizontal direction.

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