KR100906385B1 - Flocculator able to measure and control accurately G value. - Google Patents

Abstract

TECHNICAL FIELD The present invention relates to agglomerators and agitators (collectively referred to as agglomerators) used in a water purification plant, a sewage plant, or a wastewater treatment plant, and constitutes an agglomerator that can accurately measure and control the G value.

To this end, the rotation speed of the flocculator, the viscosity of the water, the rotational force measuring signal acting on the flocculator shaft, and the hydraulic efficiency of the flocculator impeller are calculated and inputted to the controller, and the ground value is calculated. By configuring the agglomerator to control the agglomerator's rotation speed to a value, and measuring the rotational force at a position symmetric to the output shaft of the agglomerator, the mechanical stability is improved because no lateral load is added to the gearhead or the agglomerator shaft when measuring the torque. The mechanical life is extended, and the treatment water quality is improved by increasing the cohesive efficiency due to accurate ground value measurement and control in consideration of the change in hydraulic efficiency.

Ground value, flocculator, hydraulic efficiency. Torque measurement

Description

Flocculator able to measure and control accurately G value.

The present invention relates to a flocculator used in a water purification plant, a sewage treatment plant, and a wastewater treatment plant. In particular, the lateral load is prevented from occurring by measuring the rotational force by using a right force, and the hydraulic efficiency of the agglomerator impeller that changes according to the rotational speed is reflected in the G value calculation. By measuring and controlling the exact value of the (G) to increase the cohesion effect.

BACKGROUND OF THE INVENTION The present invention relates to a flocculator used in a water purification plant, a wastewater treatment plant, and reflects hydraulic efficiency in improvement and measurement of ground value of the inventor's prior publication Utility Model No. 20-0149717 (1999.06.15).

The inventor's prior publication Utility Model No. 20-0149717 (1999.06.15) was a very effective G value-controlled flocculator, but by installing the torque measuring device on only one side of the output shaft of the reducer, the lateral load was reduced by the distance divided by the distance. There was a problem that the mechanical load increases by acting on the output shaft and the shaft of the agglomerator connected to the reducer output shaft.

And in the conventional method of calculating the ground value, the ground value was calculated based on the measured rotational force of the agglomerator shaft (aggregator shaft × rotational speed = shaft power), but the exact ground value should be based on the manual force. Since the hydraulic efficiency of the agglomerator impeller is multiplied by 80 to 90%, the G value based on the conventional axial power has a problem in that the G value is larger than the actual value because the hydraulic efficiency is not considered. Since the efficiency varies with the number of revolutions of the agglomerator impeller, this change must be taken into account to ensure accurate ground value measurement.

The present invention prevents the lateral load due to the rotational force measurement from the reduction gear output shaft and the agglomerator shaft, and reflects the hydraulic efficiency of the agglomerator impeller that changes according to the rotational speed, thereby measuring and controlling the accurate ground value. It is to provide an agglomerator which is mechanically stable and has high agglomeration efficiency and can accurately measure and control the ground value.

The present invention is to provide a support in the drive unit (a) with respect to the agglomerator shaft at both symmetrical positions, a rotational force meter at one side of the support, and to support the rotational force at a symmetrical position at the other support. By using the generated right force, the lateral load is prevented and the hydraulic efficiency of the agglomerator impeller changing according to the rotation speed is calculated to calculate the ground value so that the accurate ground value can be displayed and controlled.

The present invention is mechanically stable because the lateral load does not occur when the rotational force is measured, and the cohesive efficiency is increased by accurate G value measurement and control, thereby improving the treated water quality.

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

The reducer (B) and the motor (C) are installed on the drive unit pedestal (a) installed on the slab of the coagulation paper, and the coagulator shaft (g) is connected to the intermediate shaft (e) of the agglomerate pedestal (a). Bar), an impeller (h) is installed at the end of the agglomerator shaft (sa), and in the agglomerator composed of a control panel (child), the motor (c) and the speed reducer (b) are placed on the drive bracket (a). If the output shaft of the reducer is of the solid shaft type, the shaft of the intermediate shaft (e) corresponding to the reducer output shaft is of the hollow shaft type. If the reducer output shaft is of the hollow shaft type, the shafts of the intermediate shaft (e) are of the solid shaft, Insert and assemble to rotate integrally.

The reducer (B) and the electric motor (C) are integrally formed, and the reducer (B) is freely rotated while being coupled to the shaft of the reducer pedestal (A).

On both sides of the agglomerator pedestal a, the left supporter 1 and the right supporter 2 are fixedly installed at positions symmetrical to the reducer shaft and at a distance l , and contact with the rotational force transmission rod 3. Set the height so that it

As shown in Fig. 2, both ends of the flange part of the reducer (b) are machined in a flat surface, and the rotational force transmission rod (3) is installed to be symmetrical with the reducer shaft and is firmly fixed with the fixing screw (3-1). To be fixed.

Rotational force transmission pin 3 provided with an compression load cell (4) left in the distance, which is l from the reduction gear shaft, and attaching a buffer material (5) between the left holder (1) and, if the right side in the symmetrical position The shock absorbing material 5 is attached between the earth 2 and the rotational force transmission rod 3 to support the rotational force measuring means.

Alternatively, as shown in [Fig. 3], the rotational force transmission rods 3 are installed on both sides of the flange portion of the reducer (b) at positions symmetrical to the shaft of the reducer, and are firmly fixed with the fixing screws (3-1). To the rotational force transmission rod 3 at a position ℓ away from the reducer shaft, and to the left side, a tension load cell 4a is fixed between the left support 1 and the right support 2 in a symmetrical position. And a cushioning material (5) between and and the rotational force transmission rod (3) to support the rotational force measuring means.

The rotational force measuring means configured in this way has an intermediate shaft (e) connected directly to the agglomerator shaft (g), and an upper portion of the intermediate shaft (e) is connected to the output shaft of the reducer (b). The rotational force acts on the coagulator shaft by the hydraulic resistance acting on (H). When this rotational force is transmitted to the reducer output shaft through the intermediate shaft (e), the reducer (b) has the same rotational force and the same direction. The opposite rotational force acts.

If this is expressed as a formula, it is as [Equation 1].

[Calculation Formula 1]

T = 2. F. l

Where T is the rotational force of the agglomerator shaft (kgf-m)

F : force acting on the load cell (kg)

l : Distance between reducer output shaft center (= coagulator shaft center) and load cell center (m)

By measuring the force F acting on the load cells 4 and 4a from [Calculation Formula 1], the rotational force T of the agglomerator shaft can be obtained.

As described above, if both sides are supported at a position symmetrical to the output shaft of the reducer (b), a right force is generated so that only a rotational force is generated and no lateral load is generated.

Therefore, the lateral load does not act on the output shaft of the reducer (b) or the intermediate shaft (e) of the reducer pedestal, thereby increasing stability of the shaft and bearings supporting it.

The standard in the operation of the flocculator is the velocity gradient (indicated by G), and in order to achieve efficient flocculation, it is most important to measure the exact G value and control it to be a predetermined G value. .

In general, the velocity gradient values for flocculators with propeller blades are based on 50 s ^-1 before and after in the first row, 30 s ^-1 before and after in the second row, and 10 s ^-1 before and after in the third row.

The ground value (G value) of the flocculator is represented by [Calculation Formula 2].

[Calculation Formula 2]

Where G is the velocity gradient value

Pω : Passive force: watt

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

V : agglomerated paper volume (㎥)

Viscosity coefficient of water changes with water temperature, and is a value measured with the viscosity meter (7).

The shaft power is calculated from the rotational force and the rotational speed, and is expressed by the following formula (3).

[Calculation 3]

Ps = KTN = 2 .KFlN

Where Ps: shaft power: watt

K: coefficient; 1.02666 (= 1 / 0.97403)

T: Measured torque (kg-m)

N: Rotational speed of the flocculator shaft (rpm)

F: Force measured in load cell (kg)

l : Distance from reducer axis center to load cell center (m)

Manual force Pw is represented by [Calculation Formula 4].

[Calculation 4]

Pω = Ps .

Where Ps : shaft power: watt

Pω : Passive force: watt

: 임펠러의 수력효율( 임페러의 형식, 날개모양 ,크기 및 회전수에 따라 정해지는 값이다.)

: Hydraulic efficiency of impeller (value determined according to impeller type, wing shape, size and rotation speed)

From the above [Calculation Formula 1] to [Calculation Formula 4], the ground value is represented by the following [Calculation Formula 5].

[Calculation 5]

Where G is the velocity gradient value

Pw: Passive Force: watt

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

V: agglomerated paper volume (㎥)

K: coefficient; 1.02666 (= 1 / 0.97403)

F: Force measured in load cell (kg)

l : Distance from reducer axis center to load cell center (m)

N: Rotational speed of the flocculator shaft (rpm)

When the reduction ratio of the reducer (B) is R, the motor rotational speed and the rotational speed of the agglomerator shaft obtained from the motor rotational speed measuring machine 6 are expressed as shown in [Calculation Equation 6].

[Equation 6]

Where N is the agglomerator shaft speed (rpm)

R: Reduction ratio of reducer (b)

Nm: Rotational speed (rpm) measured by the motor rotational speed measuring instrument (6)

From the above [Equation 5] and [Equation 6], the ground value is expressed as [Equation 7].

[Calculation 7]

는 [도면4] 의 예에서와 같이 회전수에 따라 변화하며 근사적으로는 [계산식8] 과 같이 회전수의 함수로 표시된 다.Hydraulic Efficiency of Agglomerator Blades

Is changed according to the rotation speed as in the example of [Fig. 4], and is approximately expressed as a function of the rotation speed as shown in [Equation 8].

[Equation 8]

: 임의의 회전수에 있어서의 응집기 수력효율here,

: Agglomerator hydraulic efficiency at any rotational speed

₀ : 설계 시 응집기 축 기준 회전수에서의 효율( 최고 효율)

₀ : Design efficiency at the rotational speed of the coagulator axis (maximum efficiency)

N ₀ : Rotational speed (rpm) based on agglomerator axis in design

N : arbitrary agglomerator shaft rotation speed (rpm) during operation

α: coefficient (value determined at design time)

N m ₀ : Motor rotational speed (rpm) corresponding to the designation speed of the coagulator

N m: Motor rotational speed (rpm) corresponding to any agglomerator shaft speed during operation

In order to display the relationship between the rotational speed and the hydraulic efficiency more accurately, the hydraulic efficiency of the flocculator with respect to the rotational speed may be input as a check as shown in [Table 1], and the efficiency for each rotational speed may be input.

Table 1

는 응집기의 회전수에 따라 정해지는 값이고, 나머지 다른 항목은 설계 시에 미리 정한 값이며, 이들 측정항목의 값과 미리 정한 값을 [도면5] 의 G값 연산 및 제어 계통에 입력하면, 상기 [계산식7] 과 [계산식8] , 또는 [계산식7] 과 [표1] 에 의하여 지이값을 정확히 측정 및 제어 할 수 있다.As shown in [Calculation Formula 7] and [Calculation Formula 8], F, Nm, μ in the calculation formula are measurement items using the rotational force measuring means, the rotation speed measuring instrument 6, and the viscosity measuring instrument 7;

Is a value determined according to the rotation speed of the agglomerator, and the other items are predetermined values at design time. When the values of these measurement items and the predetermined values are input into the G value calculation and control system of [Fig. 5], The ground value can be accurately measured and controlled by the above [Calculation Formula 7] and [Calculation Formula 8], or [Calculation Formula 7] and [Table 1].

₀, 설계시 응집기의 기준 회전수 N₀ 및 Nm₀ 는 data 값으로 입력하고, G값 연산기능은 [계산식7] 과 [계산식8] 또는 [계산식7] 과 [표1] 의 계산을 수행하는 프로그램으로 구성하였다.In the calculation of the G value of Fig. 5, the controller 8, the rotational force F, the viscosity μ of the water, and the motor rotational speed Nm receive the measured values from the sensor, the volume of the flocculents V, the coefficients K and a, the distance between the reducer shaft and the load cell. l Standard hydraulic efficiency of agglomerator blades at design time

₀ , the reference rotational speed N ₀ and Nm ₀ of the agglomerator are inputted as data value, and the G value calculation function calculates [Calculation 7] and [Equation 8] or [Calculation 7] and [Table 1]. It consisted of a program.

If a specific ground value is specified in the G-value setter, the PID control function compares the G-value set value and the G value calculated in the G-value calculation function, and if it is oversized, it gives a decrease or increase signal and transmits it to the inverter or remote stepless controller. The power change and viscosity (reflecting the water temperature change) according to this shift are inputted to the PID control function through the G value calculation function, and the control signal is continuously issued so that the set value G value and the calculated G value coincide with each other. To match.

Alternatively, the central control is performed by inputting the measured value and the value of the predetermined item, the calculation and the control function to the computer of the device configured as the G value measurement and control diagram of the agglomerator using the central control room computer of [Fig. 6]. When the computer performs the above calculation and control function, accurate G-value calculation and control is possible, so that the flocculator can be operated in the optimum state and the flocculation efficiency can be increased.

In the present invention, since all the components are represented by the same number because it was explained based on one drawing of the flocculator, in the actual field, the flocculator is installed in several units, and the residence time of the flocculator is short as 20 to 40 minutes. Assuming that there is no significant temperature change of water, an expensive viscometer may be installed in one or one or two or three stages of the entire coagulation paper, and the signal may be commonly used.

1 is an exemplary view showing a configuration state of the present invention.

Figure 2 is a plan view showing the installation state of the compression load cell and the support of the present invention.

Figure 3 is a plan view showing the installation state of the tension load cell and the support of the present invention.

4 is an example of the hydraulic efficiency curve according to the rotational speed of the flocculator

5 is a schematic diagram of G value calculation and control of the agglomerator of the present invention.

Figure 6 is a G value calculation and control system diagram of the agglomerator using the central control room computer of the present invention.

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

1. Left support

2. Right support

3. Torque Transmission Rod 3-1. Set screw

4. Compression load cell 4a. Tension load cell

5. Buffer

6. Speed meter

7. Viscosity Meter

8. Ground value calculation. Controller

end. Drive bracket b. Reducer c. Electric motor Set screw

hemp. Intermediate shaft bar. Shaft joints; Agglomerator shaft ah. Impeller

character. panel

Claims (4)

A gear reducer (B) and an electric motor (C) are installed on the drive unit pedestal (a) installed on the slab of the coagulation paper, and the agglomerator shaft (g) is connected to the intermediate shaft (e) of the agglomerate pedestal (a). Bar), an impeller (h) is provided at the end of the agglomerator shaft, and in the agglomerator composed of a control panel, Install the motor (C) and the reducer (B) on the top of the drive unit (A). If the output shaft of the reducer is of solid shaft type, the intermediate shaft (e) corresponding to the reducer output shaft shall be of hollow shaft type. In the case of the hollow shaft type, the intermediate shaft (e) is a solid shaft, is assembled to rotate together by being combined with each other, On both sides of the agglomerator pedestal (a), the left supporter 1 and the right supporter 2 are fixedly installed at positions symmetrical with the reducer shaft, but have the same height as the rotational force transmission rod 3, Fix the torque transmission rods 3 on both sides of the flange part of the reducer (b) at a position symmetrical to the shaft of the reducer, Machine both ends of the flange part of the reducer (b) in a plane, install the rotational force transmission rod (3) to be symmetrical to the reducer shaft, and fix it firmly with a fixing screw (3-1), In the torque transmission rod (3) is spaced a certain distance ( l) from the reduction gear shaft The compression load cell 4 is installed on the left side of the position, and the shock absorbing material 5 is attached between the compression load cell 4 and the left support 1, and the rotational force transmission rod 3 is fixed from the reducer shaft. Distance ( ℓ) The rotational force is measured by attaching and supporting the right supporter 2 with the cushioning material 5 interposed between the right side of the position, measuring the rotational speed of the motor with the rotation speed measuring instrument 6, and measuring the water with the viscosity measuring instrument 7. Calculate the viscosity and calculate the g-value built into the control panel. An agglomerator capable of accurately measuring and controlling a ground value, wherein the ground value is calculated and controlled by the controller (8). A gear reducer (B) and an electric motor (C) are installed on the drive unit pedestal (a) installed on the slab of the coagulation paper, and the agglomerator shaft (g) is connected to the intermediate shaft (e) of the agglomerate pedestal (a). Bar), an impeller (h) is provided at the end of the agglomerator shaft, and in the agglomerator composed of a control panel, Install the motor (C) and the reducer (B) on the top of the drive unit (A). If the output shaft of the reducer is of solid shaft type, the intermediate shaft (e) corresponding to the reducer output shaft shall be of hollow shaft type. In the case of the hollow shaft type, the intermediate shaft (e) is a solid shaft, is assembled to rotate together by being combined with each other, On both sides of the agglomerator pedestal (a), the left supporter 1 and the right supporter 2 are fixedly installed at positions symmetrical with the reducer shaft, but have the same height as the rotational force transmission rod 3, Fix the torque transmission rods 3 on both sides of the flange part of the reducer (b) at a position symmetrical to the shaft of the reducer, Machine both ends of the flange part of the reducer (b) in a plane, install the rotational force transmission rod (3) to be symmetrical to the reducer shaft, and fix it firmly with a fixing screw (3-1), In the torque transmission rod (3) is spaced a certain distance ( l) from the reduction gear shaft The paper left tension load cell (4a) on the left side of the fixing location between the earth (1), and a distance from the axial reduction gear according to the torque transmitting rod (3), (ℓ) spaced apart The rotational force is measured by attaching and supporting the right supporter 2 with the cushioning material 5 interposed between the right side of the position, measuring the rotational speed of the motor with the rotation speed measuring instrument 6, and measuring the water with the viscosity measuring instrument 7. Calculate the viscosity and calculate the g-value built into the control panel. An agglomerator capable of accurately measuring and controlling a ground value, wherein the ground value is calculated and controlled by the controller (8). The method according to claim 1 or 2, the ground value calculation, the controller 8 is built-in software having a G value calculation and PID control function, and accurately measure the G value of the coagulator by the calculation of the following equation, An agglomerator which can accurately measure and control the G value, characterized by precisely controlling the G value.

(here,

Is the flocculator hydraulic efficiency at any rotational speed,

₀ is the design efficiency (maximum efficiency) at the agglomerator shaft reference speed, N _{0 is the} design of the agglomerator shaft reference speed (rpm), N is the arbitrary agglomerator shaft speed (rpm) during operation, and α is coefficient (a value determined in the design), N m _{0 is a} design of aggregation groups based on the number of revolutions the electric motor corresponding to the rotational frequency (rpm), N m is the number of revolutions the electric motor corresponding to the number of rotation axes group any agglomeration during operation (rpm ), F is the force acting on the load cell (kg), K is the coefficient (1.02666 = 1 / 0.97403), l is the distance from the center of the reducer shaft to the center of the load cell (m), V is the volume of the flocculation pond (m 3), R is the reduction ratio of the reducer, μ is the viscosity of water) The method according to claim 1 or 2, The G value calculation and the controller 8 incorporate the software with the G value calculation and PID control function, and use the table of the agglomerator shaft rotation speed, the motor rotation speed and the agglomerator hydraulic efficiency and the following equation and the G value of the agglomerator. Accumulator which can measure and control G value accurately by PID control function.

(here,

Is the coagulant hydraulic efficiency at any rotational speed, N m is the motor rotational speed (rpm) corresponding to any agglomerator shaft rotational speed during operation, F is the force acting on the load cell (kg), and K is the coefficient (1.02666 = 1 / 0.97403), l is the distance from the center of the reducer shaft to the center of the load cell (m), V is the volume of coagulation paper (㎥), R is the reduction ratio of the reducer, μ is the viscosity of water

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