KR100906384B1 - A flocculator include guide vane and hydrofoil blade with vortex bars. - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to agglomerators and stirrers (hereinafter referred to as agglomerators) used in water purification plants, sewage stations or wastewater treatment plants.

It is an object of the present invention to provide an agglomerator having hydrofoil vanes with guide vane devices and vortex rods at the inlet side in the first row of agglomerators in order to enhance the agglomeration effect of the agglomerator.

In order to achieve the object of the present invention, at the bottom of a square flocculation paper or mixed paper (hereinafter referred to as flocculation paper), an impeller composed of a hydrofoil blade having a vortex rod attached to a height of 1/3 to 1/2 of the water depth is installed. In addition, a guide collar was installed at the inlet side of the hydrofoil blade, the impeller was connected to the vertical axis, and the vertical axis was connected to the variable speed drive.

In the present invention, the first row of the flocculation paper is a hydrofoil impeller having a vortex rod attached thereto, and the second and third rows generate a uniform circulation flow and vortices by the action of the flocculator using the hydrofoil impeller, and thus the aggregation effect is good. Due to the action of the quill device, there is no eddy current at the inlet, so that the coagulation efficiency is high, the power is reduced, and the treatment water quality is improved by increasing the coagulation efficiency.

 Vortex rods, hydrofoil wings, flocculators, guide vanes.

Description

A flocculator include guide vane and hydrofoil blade with vortex bars. }

The present invention relates to a flocculator in a water purification plant or a wastewater treatment plant.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flocculator used in a water purification plant or a wastewater treatment plant, and relates to an improvement of the inventor's prior registered utility model No. 20-0292241 (2002.10.02).

The inventor's pre-registered utility model No. 20-0292241 generates an even flow, easily forms a hydrofoil blade with good hydraulic efficiency, and uses the blade to form an impeller having good cohesive characteristics.

However, the impeller was very useful for forming a uniform rotational flow in the flocculation basin, but there was a limit to increase the coagulation efficiency due to the weak lateral mixing in the rotational flow. Since the installation location and the ambient conditions were not clearly defined, it was necessary to improve the application of the flocculator with high hydraulic efficiency and good flocculation characteristics.

The present invention is to effectively configure the impeller using a hydrofoil blade attached to the guide vane device and the vortex rod to provide a flocculator with high hydraulic efficiency and good flocculation effect.

The present invention installs an impeller composed of a hydrofoil blade with a vortex rod at a position of 1/3 to 1/2 of the water depth from the bottom of the flocculation basin, and a guide feather device is installed at the inlet side of the impeller. By connecting to a vertical axis connected to a variable speed drive, it is possible to provide a flocculator having good hydraulic efficiency, generating uniform flow and mixed flow, and having good flocculation characteristics.

The present invention generates a uniform flow and mixed flow by the action of an impeller composed of a hydrofoil blade having a vortex rod attached to the first row of the flocculation paper, thereby increasing the number of times of floc contact, and the flocculation effect is improved. Since no vortex occurs at the inlet, the hydraulic efficiency is high, the power is reduced, and the treatment water quality is improved by increasing the cohesive efficiency.

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

An access passage (D) is installed in the upper slab of the agglomeration paper (A), a variable speed drive device (1) is installed at the center thereof, and a vertical axis (2) is perpendicular to the lower portion of the variable speed drive device (1). Connected to be.

The length of the vertical axis | shaft 2 is set so that the position of the impeller 3 may be 1/3 to 1/2 of the water depth from the bottom of the coagulation paper (b).

Insert the impeller (3) at the lower end of the vertical shaft (2), then insert the key into the key groove (3-4), assemble the impeller fixture (4), and tighten by fixing screws (not shown).

In the lower part of the impeller 3, as shown in [Fig. 1], the guide feather device 5 is installed, and the guide feather device 5 is fixedly installed on the pedestal 6, and the pedestal 6 is installed at the bottom of the coagulated paper. ) With the basic screw (7).

The impeller 3 is formed by attaching two or more hydrofoil wings 3-2 to the wing hub 3-1 at equal intervals, and at the hydrofoil wings 3-2. One or more vortex rods 3-5 are attached vertically, a shaft hole 3-3 is formed in the center of the wing hub 3-1, and a key groove 3- in the shaft hole 3-3. 4) was formed, the diameter of the wing hub (3-1) is 0.4 ~ 0.5 times the diameter of the impeller, hydrofoil blades and impeller to determine the shape and size of the wing by applying the design theory of the axial pump.

The reference to the operation of the flocculator is the velocity gradient (G).

In general, velocity gradient values are based on around 50 s ^-1 in the first row, around 25 s ^-1 in the second row, and around 10 s ^-1 in the third row.

In addition, the speed gradient value is represented by the following [Calculation 1].

[Calculation 1]

G = {Pw ÷ (μ × V)} ^1/2

Where G is the velocity gradient value

        Pw: Passive Force: watt

        μ: coefficient of viscosity of water. N. s / ㎡

        V: agglomerated paper volume (㎥)

The passive force of the impeller with hydrofoil wings is shown in [Equation 2].

[Calculation Formula 2]

Pw = (γ × g × Q × H) ÷ 60

Where G is the velocity gradient value

        Pw: passive force of impeller: watt

        γ: specific weight of water (1,000kg / ㎥ at 4 ℃)

g: acceleration of gravity. 9.8 m / s ²

        Q: discharge flow rate of impeller (㎥ / min)

        H: discharge head of impeller, m

The G value from the above [Calculation Formula 1] and [Calculation Formula 2] is expressed as shown in [Calculation Formula 3].

[Calculation 3]

G = {(γ × g × Q × H ÷ 60) ÷ (μ × V)} ^1/2

The power Ps acting on the axis of the agglomerator is as shown in [Equation 4] below.

[Calculation 4]

Ps = Pw ÷ eh

Where Ps is the axial force

        Pw: Passive Force

        eh: Hydraulic efficiency of impeller is 0.8 ~ 0.95 and it depends on the shape of impeller.

Ns (specific speed), which is the pump type selection criterion, is as shown in [Equation 5].

[Calculation 5]

Ns = n × Q ^1/2 ÷ H ^3/4

Where Ns: specific velocity (axial pump is 1,000 ~ 2,000)

        n: rotational speed of the impeller. RPM

        Q: discharge flow rate of impeller (㎥ / min)

        H: discharge head of impeller (m)

The design order of the hydrofoil blades and impeller of the flocculator is determined so that the circumferential velocity of the impeller is less than 2.5 m / s in the first row and 0.6 m / s in the third row, and the impeller diameter is 0.35 to the width of the flocculator. Determine the number of revolutions of the impeller by setting 0.4 times.

When the number of revolutions of the impeller is determined, Q and H are determined so that the necessary Ns and G values are obtained using [Calculation Formula 1] to [Calculation Formula 5].

When Q and H are determined, it is designed to be a hydrofoil wing having a shape suitable for Q and H. The number of wings, the inlet wing angle and the outlet wing angle in each cross section, the blade width (string length), and the number of wings Then, the shaft power is calculated by calculating the hydraulic efficiency of the impeller using these values.

Using the values determined through the above calculation, the hydrofoil vanes 3-2 are formed at the ends (outside) of the contact portion (inner side) with the wing hub 3-1 and at the ends of the hydrofoil vanes 3-2 (outer side). Each wing width (also called chord length) is a predetermined width, and the inlet wing angle and outflow of the water inlet (inlet) and the water outlet (outlet) of the hydrofoil blades 3-2 are respectively. Determine the secondary wing angle.

Inlet wing angle, outlet wing angle, chord length, and wing arc radius (R1, R2) are defined (see Figure 7). One radius is R1, the other is R2 and the length is hydrofoil wing length. In the conical tube having the same length as L, the corresponding points are designated as shown in [Fig. 8], and the blades are cut along the connecting line to form a hydrofoil blade (3-2). It is attached to the hub 3-1 at predetermined angles and formed at equal intervals to form an impeller. (The method of forming the hydrofoil wing is described in detail in the inventor's prior utility model 20-0292241 (2002.10.02). Therefore, detailed description is omitted.

The hydrofoil blade 3-2 is attached with a swirl rod 3-5 at the tip of the blade in the vertical direction.

When the flocculator configured as described above is operated, the water in the flocculation basin is pumped by the action of the hydrofoil blade in the flocculation basin, as shown in [Figure 1], and the flow flows evenly up and down in the flocculation basin. On the plane, the main swirl in the direction of the large arrow and the vortex generated by the vortex rods (3-5) coexist, and the small swirl flow occurs around the control plate 8 due to the main swirl flow, so that the inside of the flocculent land is uniform. As the mixing takes place, the fine flogs in the water collide frequently, adsorbing to each other and growing into larger and larger flocs to facilitate precipitation.

In the flocculation basin, swirl flow flows in plan view, but at the inlet of the impeller 3, a plurality of guide vanes 5-1 are provided inside the guide vane device 5, so that the swirl flow is the guide vane 5 When it flows through -1), it is rectified and converted into vertical flow, and when it flows into the hydrofoil vane (3-2) of the impeller, it flows into the vertical flow without swirling flow and the hydraulic efficiency is increased.

In general axial flow type pump, a guide vane is installed at the outlet side to convert the swirl flow generated at the outlet side into a pressure head to increase hydraulic efficiency.However, in the case of agglomerator, the throttle flow at the outlet side is installed on the wall of the flocculation paper. Do not install the guide feather on the outlet side as it interacts with 8) to generate an even mixed flow in each part of the flocculation paper and promote the flocculation action by mixing and stirring the whole flocculation paper evenly.

Since the flocculator having the hydrofoil impeller with the vortex rod described above has high agitation performance, it is installed in the first row of flocculation papers having a relatively small size of flocs (flocculated particles) to increase flocculation efficiency, and the flocs are relatively large. In the second and third rows of the fragile flocculation paper, flocculators using a hydrofoil impeller from which the vortex rod is removed from the impeller of the flocculator are installed to increase the flocculation effect.

1 is a cross-sectional view showing a configuration of the present invention.

2 is a plan view showing a configuration of the present invention.

3 is a plan view showing the configuration of the impeller of the present invention.

Figure 4 is a cross-sectional view showing the configuration of the impeller of the present invention.

Figure 5 is a plan view showing the configuration of the guide feather of the present invention.

Figure 6 is a cross-sectional view showing the configuration of the guide feather of the present invention.

Figure 7 is a diagram illustrating the characteristics of the hydrofoil blade of the present invention.

8 is an explanatory diagram for forming a hydrofoil wing of the present invention.

<Description of the code | symbol about the principal part of drawing>

1. Variable speed drive

2. vertical axis

3. Impeller 3-1. Wing Hub 3-2. Hydrofoil wing

3-3. Shaft Bore 3-4. Key Home 3-5. Vortex rods

4. Impeller Fixture 4-1. Fixing screw (not shown)

5. Guide feather device 5-1. Guide feather 5-2. Guide

5-3. Information sphere

6. Pedestal

7. Foundation screw

8. throttle

end. Flocculation b. Clumping bottom; Rectifier d. Access

Claims (2)

An access passage (D) is installed in the upper slab of the agglomeration paper (A), a variable speed drive device (1) is installed at the center thereof, and a vertical axis (2) is perpendicular to the lower portion of the variable speed drive device (1). In the flocculator connected so that In the first row of the flocculation paper, the length of the vertical axis 2 is determined so that the position of the impeller 3 is 1/3 to 1/2 of the water surface length from the bottom of the flocculation paper. Insert the impeller (3) at the lower end of the vertical shaft (2), and then insert the key into the key groove (3-4), assemble the impeller fixture (4), and tighten by fixing screws, A guide collar device 5 is installed at the lower part of the impeller 3, and the guide collar device 5 is fixedly installed on the pedestal 6, and the pedestal 6 is installed with a base screw 7 at the bottom of the agglomerated paper. The impeller 3 is formed by attaching two or more hydrofoil blades 3-2 to the wing hub 3-1 at equal intervals, and at least one vortex rod on the hydrofoil blades 3-2. (3-5) is attached and fixed in the vertical direction, the shaft hole (3-3) is formed in the center of the wing hub (3-1), the key hole (3-4) in the shaft hole (3-3) Hydrofoil blades and impellers are applied to the design theory of the axial pump to determine the shape and size of the blades, while the diameter of the wing hub (3-1) is 0.4 to 0.5 times the diameter of the impeller. The hydrofoil blade 3-2 has a discharge flow rate and a discharge head satisfying a predetermined speed gradient value, so that the contact portion (inside) with the blade hub 3-1 and the tip of the hydrofoil blade 3-2 are inclined. Determine the wing width (also called the string length) at the (outer side), respectively, the inlet wing angle at the water inlet (outlet) and the water outlet (outlet) of the hydrofoil wing 3-2, and Determine the outflow wing angle, Once the inlet and outlet wing angles and chord lengths, and the radius of the wing arcs (R1, R2) are determined, the radius on one side is R1, the radius on the other is R2 and the length is the same as the length of the hydrofoil wing length L. Designate the corresponding points in the conical tube and cut along the connected lines to form the hydrofoil vanes 3-2, and the hydrofoil vanes at equal intervals at a predetermined angle to the wing hub 3-1. Attach to form an impeller, At the inlet of the impeller 3, a plurality of guide vanes 5-1 are provided inside the guide vane device 5, so that the swirl flow is rectified while passing through the guide vanes 5-1, and is in a vertical flow. Agglomerator with a hydrofoil vane with a guide vane and a vortex rod, which is changed and introduced into a vertical flow without swirl flow when entering the hydrofoil vane (3-2) of the impeller. delete

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