KR200199579Y1 - Floculator with gt valve controler - Google Patents

Abstract

This study is a device for controlling the speed of the stirring impeller installed in the flocculator in the water treatment plant. More specifically, the residence time (T) of the floc of the flocculation basin and the corresponding G value (Velocity Gradiant) * T (G value multiplied by residence time T) is set to stir constantly, and flow sensor is installed in the inlet or outlet weir or flow meter, and the change of agglomerated paper is changed by using the inflow signal. It is possible to know the time (T), and to operate by controlling the agitator of the agglomerator with the converted G value, the converted G value allows the temperature sensor to be submerged in water so that the water temperature can be measured and the change of the water temperature. The agglomerator motor adjusts the rotation speed of the agglomerator motor. The agglomerator is operated by a GT controller that improves the efficiency of the hook formation of the machine and the power efficiency.

Description

Agglomerator with BT control {FLOCULATOR WITH GT VALVE CONTROLER}

In general, the flocculator installed in the water purification plant plays a role of bridging the floc formation of the sludge particles in order to increase the sedimentation efficiency of the sedimentation basin. The G value (Velocity Gradient) is used as an operation to increase the floc formation of flocculated sludge particles.

However, in actual operation, the G value should be continuously changed according to the inflow water amount (sludge flotation residence time T). Therefore, it is preferable to operate the G value converted by the GT setting.

The present invention operates the GT constantly, and adjusts the rotational speed of the impeller of the agglomerator by the calculated G value based on the quantity (that is, the function of the residence time of the flocks in the flocculation pond) and the water temperature (viscosity coefficient function). As a result, in the past, only the set G value was used, that is, only the operation by the water temperature did not apply the changed G value for the flow rate change, but the GT value control operation allowed the stirring impeller to be properly rotated according to the formula.

In fact, in the operation of the water treatment plant, the change in daily water temperature is very small, and the change in flow rate often varies a lot. Therefore, it is necessary to operate by GT control considering the residence time of the land.

This study is to solve the defects of operating according to the water temperature by setting the conventional G value, using a GT controller as described in detail based on the accompanying drawings as follows.

The value of GT (G value multiplied by the residence time T of the flocculation paper) is 23,000 to 210,000, which is a suitable stirring condition. This range is set to a constant value depending on the flocculator of the water purification plant. The equation of operation is as follows.

It can be seen from the above equation that the G value is proportional to the Q flow rate.

Also

The G value is represented by the following equation as is known.

Approximation formula with viscosity of water at arbitrary temperature t

In formula (III) (IV)

In the formula

When the GT value is set, it can be seen that the RPM of the stirrer is proportional to α (flow percentage) ^2/3 , and to α ₁ (viscosity percentage) ^1/3 .

In the above formula, when the inflow is the maximum inflow of the design flow rate, the maximum RPM of the stirrer is applied when the viscosity is the maximum when the temperature is 0 degrees, and when the flow rate and the temperature are changed, the flow rate percentage ^2/3 , the viscosity coefficient percentage ¹ It can be seen that it is operated by applying ^{/ 3} .

In addition, the following table shows the correlation between temperature and RPM.

This paper is to solve the problems of poor flow formation due to the change of flow rate and temperature, and was supplemented by applying the control method that set GT value.

The structure of this agglomerator is shown in FIG. 1 and FIG.

In order to effectively control this, the flow rate detection signal is transmitted by a flow meter installed at the inlet or outlet, so that the flow rate can be known so that the residence time of the flocculator can be known, and the encoder is mounted on the motor shaft connected to the reducer of the flocculator. Equipped with a water temperature detection sensor that can detect the number of revolutions of the motor and transmits the signal to the inside or outside of the tank, and synthesizes each signal from this and sends the output to the motor shaft connected to the agglomerator shaft to control the agitator. In detail, when the GT value is set on the control panel, the residence time of the flocculation basin is calculated by the flow signal, and the required converted G value is displayed to determine the number of revolutions of the motor. By adjusting the rotational speed percentage by controlling the agitator of the agglomerator to optimize the coagulation effect, It is economical and very beneficial system by saving electricity.

In general, admixtures and agglomerators installed in water purification plants form turbidity of sludge by stirring impeller blades to remove turbidity by increasing sedimentation efficiency. In order to effectively form sludge flocculation, the agitator blade rotation speed of the agglomerator must be properly adjusted, but if the rotation speed is large, the fructus may be broken and the waste of electricity is increased. The efficiency is lowered, which causes disruption to the water production.

In addition, when the inflow amount is the design quantity, it should be operated with design power. However, when the inflow quantity is half of the design quantity, the residence time of the flocculation paper and the settler is doubled and the collision times of the sludge particles are doubled. It will need to be cut in half.

Also, as the temperature changes, the average speed gradient (G value) is made constant, which is given by the reduction ratio shown in the diagram according to the temperature change.

By setting and controlling the GT, by controlling the stirrer with the output calculated according to the temperature according to the flow rate, it is assumed that the sludge is increased, and the operation is performed without wasting unnecessary power.

Conventionally, as shown in FIG. 1, pedestals 11 and 11 ′ are fixed to the upper slab 10 of the flocculation paper 1 and a reduction gear 31 directly connected to the continuously variable transmission 30 is installed. 1) The end 21 of the temperature sensor 20 is installed to be submerged in the water 22, and the rotation speed of the continuously variable transmission 30 is detected by a tachometer, or the proximity switch 72 to the coupling 71 or the like. ), It is installed, detected, sent to the control panel 40, and operated only by the G value setting.

In the conventional case, since the operation is performed only by the design G value or the set G value, the rotation speed of the stirrer cannot be automatically operated properly when the design flow rate and the inflow flow change are severe, so the slug of the sludge is broken well and the power is consumed a lot. There was a lot of problems in that the G-value setting had to be changed and operated manually from time to time because of poor formation.

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1 is a view illustrating a conventional G value controller

2 is a cross-sectional view of an embodiment of the present invention

3 is a view showing a GT value controller in the same embodiment

4 is a sectional view of a rotation detection state of the embodiment.

5 is a control block diagram of the embodiment.

※ Explanation of code for main part on drawing ※

1: coagulation index tank 10: slab 20: water temperature detection sensor

30: reducer 40: motor

50: encoder 60: impera

70: coupling 80: GT control unit 90: flow meter

100: flow rate detection sensor

Hereinafter, the GT control device of the flocculator according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view showing an operating part of the GT control device of the flocculator according to the present invention, and pedestals 11 and 11 'are provided on the slab 10 of the flocculator 1, and the reduction gear 30 and the motor 40 are shown in FIG. ), And an impeller 60 and an impeller shaft 61 are installed on the output shaft by couplings 70, 71, etc., and a separate shaft is connected to the end 42 of the emulator shaft 41 to the encoder 50. And the rotational speed signal coming from the GT control unit 80, and the tip 21 of the water temperature detection sensor 20 is submerged in water to install the signal at the flocculation site or the inflow and outflow part. It is to be transmitted to the GT control unit 80, and to install the flow meter 90 capable of transmitting the detection signal at the inlet or outlet of the flocculation paper to transmit the flow signal, and transmit the signal to the GT control unit 80 do.

The GT control unit 80 calculates the water temperature signal and the flow rate signal and sends a signal to the inverter to output the rotation of the impeller stirring blade through the motor reducer.

Referring to the operating state according to the embodiment of the present invention configured as described above are as follows.

Set GT value to 180,000 on the GT control panel of this panel.

At this time, if 80% of the design quantity (design of the retardation time 2400 seconds) which is the maximum value flows in by the flow signal, and the water temperature shows 20 degrees.

In the GT control panel, the delay time T is shown as 2400 seconds / 0,8 = 3000 seconds, the G value is displayed as 75 at 75 × 0.8 = 60, and the rotating RPM of the stirrer is 1287 RPM with 1800 × 0.8 ^2/3 × 0.83. The output is output at the calculated speed (0.83 is ^{1/3 the} viscosity coefficient)

In addition, the actual running speed of the coagulator is calculated by flowing into the panel as a pulse signal by the encoder connected to the motor shaft of each agglomerator, and appears as 187rpm to 1287rpm.

In this way, the GT controller of the flocculation basin maintains the proper G value and the appropriate peripheral speed even if the inflow amount changes, thereby increasing the effect of forming the hook, reducing the power, and reducing the labor required by automation. have.

Claims (3)

In rotating the impeller rotary blades of the flocculator by using the electric motor and the reduction gear in the flocculator of the water treatment plant, the GT value is arbitrarily set in the GT value controller 80, and the flow rate detection sensor 80 and the water temperature detection sensor According to the detection data of (20), the GT value control unit is characterized by calculating the T (agglomeration retention time) and G (average speed gradient) values, and calculating and controlling the rotation RPM of the driving motor corresponding thereto. It is a flocculator. According to claim 1, a separate shaft 43 is provided by tapping or the like on the motor upper shaft 41 with the jaw 42 of the motor 40 to the rotational torque measuring means, and the biaxial coupling is flexibly coupled. It is connected to the encoder 50 side and the reinforcement plate 51 and the like, and the output signal 52 is a coagulator with a GT value control, characterized in that for transmitting a signal to the GT value control. The GT value display section 81 is arbitrarily set and displayed by the button of the GT value setting button 82 in the GT value control section (Fig. 3) display portion, and the G value display section 83 is set in this GT value setting. ) And T value display section 84 is agglomerator with a GT value control unit.