KR100534539B1 - The System for Flow Control in Water Treatment Facilities - Google Patents

Abstract

The present invention relates to a flow control system of a water treatment plant including a water treatment plant or a sewage treatment plant. The flow control system of the water treatment plant according to the present invention includes a water treatment having an inlet for inflow of water from the outside and an inlet opening and closing means for opening and closing the inlet. First structure; A water treatment second structure in which water discharged from the water treatment first structure is introduced and an outlet for introducing the water flows out; Measuring means formed at a lower portion of the outlet and measuring flow rate data of water flowing out of the outlet and falling freely; And a control means electrically connected to the measuring means and the opening and closing means, respectively, to control the operation of the inlet opening and closing means by receiving flow rate data from the measuring means.

The flow control system of the water treatment facility according to the present invention accurately measures the relative flow rate of the water treatment facility to minimize the difference in flow rate and control the flow rate flowing into each structure even when the flow rate fluctuates to achieve an even distribution of the flow rate. It has an effect.

Description

The System for Flow Control in Water Treatment Facilities

The present invention relates to a flow control system of a water treatment facility, and more particularly, to measure the treatment flow rate of a water treatment structure including a water treatment plant or a sewage treatment plant, and analyze the measured flow rate to control the inflow rate at the inlet of the structure in real time. In addition, the present invention relates to a flow control system of a water treatment facility that can distribute the flow evenly and stably evenly in case of sudden fluctuations in flow rate, and can easily distribute the flow evenly without additional facility construction.

In general, a water treatment plant means a water treatment plant or a sewage treatment plant. The sewage treatment plant filters waste water through a screen and a settler during the pretreatment stage and precipitates suspended matter such as sand having a relatively low specific gravity than water. . The sludge generated as a by-product is transported separately, reacted with air through the aeration tank and the final sedimentation basin to precipitate microorganisms, and then finally discharged. In the summer, it is disinfected with sodium hypochlorite or discharged by UV sterilization, and a separate process is added according to the type of water to be treated or the treatment standards established by relevant environmental regulations.

On the other hand, the water purification plant is one of the water treatment facilities for converting the raw water introduced from the river or reservoir through the water collection well to clean water by, for example, water purification through a process such as landing, mixing, and distribution water, flocculation, sedimentation, filter, and water purification.

The water treatment facilities necessarily include at least one overflow portion or free fall portion, and form a distribution channel for distributing the treated water to a plurality of water treatment structures. The distribution channel is a structure for distributing the flow rate, and all water treatment facilities, not a single structure, distribute the flow rate through the distribution channel. On the other hand, the connection portion connected to the structure of the next stage in the distribution channel is usually formed by a circular pipe, a square passage, or a weir. At this time, the flow rate difference of the flow rate flowing into the next step occurs according to the structure, shape or arrangement of the distribution channel. That is, the sewage that has passed through the distribution channel has a problem that the flow rate is not correctly distributed in the next step. In addition, the inlet to the distribution channel usually has a narrow pipeline, so that the sewage flowing through the distribution channel increases rapidly at the end of the distribution channel, which creates an unstable flow in the entire sewage through the distribution channel.

4 is an explanatory diagram showing the flow rate distribution during the distribution of the flow rate in the distribution channel, and as shown, mainly in the next step of the distribution channel 1, a plurality of water treatment structures 2a to 2n are arranged horizontally. That is, the inlet flow rate is concentrated in the structure 2a located relatively close to the distribution channel 1, and the inlet flow rate decreases as it moves away from the distribution channel 1. This acts as a cause of reducing the overall efficiency of the water treatment facility, and since the pipes, the square passages, or the overflow ware connected to the next structure in the distribution channel are usually civil structures, the flow rate difference also occurs due to the minute construction error generated during construction. . Therefore, as described above, the flow rate difference occurs depending on the structure of the distribution channel and the arrangement of the next stage structure.

On the other hand, when the treated water is discharged, it is usually aggregated and discharged in a predetermined amount, and a conventional flow distribution device for distributing a flow rate mainly uses a flow meter to measure and correct the flow rate. The flowmeter used here assumes that the sewage to be treated is an ideal gas that is so small that viscosity can be neglected, and the flow rate is estimated based on the Bernoulli's principle that the sum of potential energy and kinetic energy of the fluid is always constant. This is corrected by experiment. In the case of in-pipe flow, various measuring devices have been devised, and can be easily measured, but a flow including a free surface, such as a channel, is not very easy to measure the flow rate. Therefore, when measuring the flow rate in the channel flow, a method of measuring the flow rate using the depth of the overflow vein overflowing the weir (weir) by the overflow formula.

In addition, Equation 1 represents the overflow calculation formula, and the flow rate calculation by the overflow formula is not very simple because the flow coefficient “C” varies according to the shape of the structure and the overflow format. In addition, the inlet of the water treatment structure is usually formed of a pipe, a square passage or a overflow weir with a large cross-section, so that the flow velocity is not constant at each position, and accurate flow measurement is very difficult because the fluid flows in an unsteady state. By practically impossible.

Q = CL [H ^3/2 ]

here,

Q: flow rate, C: flow coefficient, L: wear width, H: overflow depth.

In particular, in water treatment facilities, structures of various shapes exist and the throughput per unit facility varies. In addition, since most water treatment facilities have the same structure in parallel, the distribution of flow rates accurately among the multiple structures having the same function is the key to improving the operation and treatment efficiency of the water treatment plant.

The present invention has been made to solve the problems described above, the object of the present invention can be commonly used in water treatment facilities, such as water purification plants or sewage treatment plants, and measured the flow rate at the outlet side of the water treatment facility and based on the inlet side It is to provide a flow control system of a water treatment plant that can minimize the relative flow difference of the entire water treatment system by controlling the flow rate of the water.

Another object of the present invention is to accurately measure the relative flow rate of each water treatment structure by measuring the flow rate using the amount of fluid drop and the fresh water surface height (overflow depth), and to achieve an even distribution of the flow rate by controlling the flow rate in real time. It is to provide a flow control system of a water treatment facility.

In order to achieve the above object, the flow rate control system of a water treatment plant according to the present invention includes a water treatment first structure having an inlet for inflow of water from the outside and an inlet opening and closing means for opening and closing the inlet; A water treatment second structure in which water discharged from the water treatment first structure is introduced and an outlet for introducing the water flows out; Measuring means formed at a lower portion of the outlet and measuring flow rate data of water flowing out of the outlet and falling freely; And a control means electrically connected to the measuring means and the opening and closing means, respectively, to control the operation of the inlet opening and closing means by receiving flow rate data from the measuring means.

The outlet is further provided with a water level measuring means for measuring the water level of the water immediately before flowing out from the outlet, the control means is electrically connected to the measuring means to receive the water level data from the measuring means to operate the opening and closing means It is characterized by controlling.

The measuring means is a scale and the flow rate data is characterized in that the weight of the free falling water.

The water treatment second structure further includes a second inlet through which water discharged from the water treatment first structure flows and a second opening and closing means for opening and closing the second inlet, wherein the control means is electrically connected to the second opening and closing means. Connected to control the operation of the second opening and closing means.

Inside the water treatment second structure, one end is inclined and the other end is a guide channel with an inner end surface circumscribed at the outlet, and the water freshened in the second structure is overflowed to the guide channel and flows out through the outlet. It features.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the flow control system of the water treatment facility according to the present invention. The accompanying drawings are an example for describing the flow control system of the water treatment facility according to the present invention in detail, and the scope of the technical idea of the present invention is not limited or limited by the drawings or the description with reference to the drawings.

Figures 1a to 1b is a perspective view of the water treatment structure of the present invention, Figure 2a is a cross-sectional view A-A 'of Figure 1a, Figure 2b is a cross-sectional view B-B' of Figure 1a, Figure 3 is a block showing a flow control system of the present invention Roads, which will be described with reference to the following, in designating the reference numerals for the main parts of the drawings, the same components are denoted by the same reference numerals as much as possible throughout all the drawings and known contents that may confuse the gist of the present invention are Omit the description.

The flow control system of the water treatment facility according to the present invention measures the discharge flow rate and the discharge water level to control the inflow of the inlet portion. When measuring the flow rate of the discharged water, the weight, which is the flow rate data of free-falling water, is measured. For example, a mass flow rate, that is, a mass flow rate, is measured using a scale to convert the flow rate therefrom. Subsequently, the above-described method is applied to a plurality of water treatment plants having the same structure to reduce the relative flow difference.

In the channel to form a free surface, the height of the free surface is not constant, even if the depth and width of the channel measuring the measurement error occurs. In addition, the water treatment facility is usually formed of a civil structure, the extreme flow difference occurs even in the minute construction error of several cm generated during construction. Therefore, since the flow rate cannot be accurately measured in the channel by the general flow meter, the present invention measures the weight of the falling fluid and calculates the flow rate therefrom to quantify the relative flow difference between the structures.

Flow rate represents the amount of fluid that passes through a unit area for a unit of time and is usually measured on the basis of the Bernoulli principle. The flow rate may be represented by a volume flow rate, but may be represented by a mass flow rate when the density of the fluid is constant.

Equation 2 shows a pressure calculation formula, and the pressure may be defined as the sum of the static pressure and the dynamic pressure.

P = P _static + P _dynamic

= Ρ [gh] + ρ [ν ² ]

＝ ρ [gh + ν ² ]

here,

P _static : static pressure, P _dynamic : dynamic pressure, ρ: density, g: gravitational acceleration, h: position head, ν: velocity.

According to Bernoulli's principle, static pressure is proportional to depth, and dynamic pressure is proportional to the square of velocity. That is, the flow rate difference also occurs depending on the flow rate. For example, if the processing flow rate is doubled, the speed is doubled to change the pressure difference at each inlet according to the total flow rate.

Referring to FIG. 1, the water flowing through the distribution channel 10 flows into the first water treatment structure 20 through the inlet 21a, and the first water treatment structure 20 is lifted by an opening and closing plate 21c, for example. Inlet opening and closing means (21b) for controlling the inlet cross-sectional area of the inlet (21a) by lowering is formed. The inlet opening and closing means 21b is electrically connected to the control means 90 so as to communicate with each other to move data, and the control means 90 transmits a control command to the opening and closing means 21b.

The water treatment second structure 30 preferably shares one side wall 32a with the water treatment first structure 20, and the water flowing out of the water treatment first structure 20 is disposed in the side wall 32a. A second inlet 31a flowing into the structure 30 is formed, and although not shown, a second opening and closing means for opening and closing the second inlet 31a is formed in the water treatment second structure 30. . The second opening and closing means is the same as or similar to the above-described electrically connected to the control means 90 and communicate with each other to transmit and receive data, the second opening and closing means is operated by the control command of the control means 90 The opening and closing amount of the two inlets 31a is adjusted. The water treatment agent may be formed by forming, for example, a groove in the uppermost part of the side wall 32a shared by the first water treatment structure 20 and the second water treatment structure 30 by the second inlet 31a and the second opening / closing means. It is apparent that the fresh water of the first structure 20 may be introduced into the second water treatment structure 30 through the groove.

Meanwhile, the water flowing out of the first water treatment structure 20 is introduced into the second water treatment structure 30 through the second inlet 31a. The water treatment second structure 30 has an outlet 31c formed on one sidewall 32b of the water treatment second structure 30 so that water from the water treatment second structure 30 is discharged to the outside through the outlet 31c. In addition, the outlet 31c may be formed at a relatively lower position than the second inlet 31a in order to prevent water flowing into the water treatment second structure 30 from flowing back to the water treatment first structure 20. It is preferable to. In addition, when the water flowing out of the first water treatment first structure 20 is introduced into the water treatment second structure 30, the outlet water at the second inlet (31a) so that the water flows naturally toward the outlet 31c. It is also possible to form a height gradient linearly on the bottom surface of the water treatment second structure 30 so as to become lower toward 31c).

Meanwhile, an elongated guide channel 30 'is formed inside the second water treatment structure 30. Referring to FIG. 1B, a plurality of supporting beams are first formed inside the second water treatment structure 30. Side by side parallel to (33), and fixed to both ends of the support beam 33 to the adjacent two walls (32c, 32d) of the side wall (32b) formed with the outlet 31c, guides the upper portion of the support beam 33 The waterway 30 'is fixed and seated. In general, since the water treatment facility is formed of a civil structure, the support beam 33, the elongated guide channel 30 ', and the water treatment first and second structures 20 and 30 are preferably integrated and constructed. The guide channel 30 'is installed in a plane orthogonal to the support beam 33, and one end 30'a is inclined with respect to the outside, and the other end 30'b has an inner end surface at the outlet 31c. It is coupled externally and the top is open to form the recess 31 ', so that the water level surface of the fresh water in the second water treatment structure 30 is gradually increased, overflowing the guide channel 30' and finally the outlet ( 31c) through the outside. On the other hand, the structure, such as the elongated guide channel because the shape is so varied that the upper part may not be open, it is obvious that the present invention is not limited to the open elongated guide channel of the present embodiment.

Although not shown, the outlet port 31c is provided with a water level measuring means for measuring the water level of the water flowing out, the water level measuring means is electrically connected to the control means 90 to move the data, water treatment The water level surface of the second structure 30 is measured and the control means 90 receives and stores the water level data of the measured water level surface from the water level measuring means.

It is preferable to use an ultrasonic level gauge or a radar level gauge as the level measurement means. The ultrasonic water level gauge measures the water level using the time required to be reflected at the surface of the fluid by transmitting sound waves. In the ultrasonic water level gauge using the ultrasonic attenuation method, ultrasonic waves pass through the air when the liquid is dropped between predetermined gaps. When the intensity of the ultrasonic wave is attenuated excessively. In addition, the water level measuring means is various and is not limited to the above-described ultrasonic water level is apparent.

Water passing through the outlet 31c falls freely and flows out. At this time, the outer lower portion of the outlet 31c is provided with a measuring means 40 for measuring the flow (flow rate) data of the free-falling water. The measuring means 40 is preferably provided with a digital electronic balance to measure the amount (weight) of the free falling water. That is, the water passing through the outlet 31c freely falls by gravity, and the water freely falls by the mass of the water and the kinetic energy collides on the scale of the scale to generate the collision energy, and the digital electronic scale converts it by weight. Measure it by In addition, the scale, which is the measuring means 40, is electrically connected to the control means 90 to communicate with each other to transmit and receive a communication signal. The control means 90 receives and stores flow rate data as weight information from the scale, and receives and stores data received from each water treatment second structure 30.

Hereinafter, the flow distribution relationship until the water flowing in from the distribution channel is discharged will be described.

Water introduced from the outside through the distribution channel 10 flows into the water treatment first structure 20 through the inlet 21a and flows back into the water treatment second structure 30 through the second inlet 31a. As the water flowing into the second water treatment structure 30 gradually increases in water level and exceeds the longest ground height of the guide channel 30 ', the fresh water starts to overflow into the guide channel 30'. . The water overflowed to the guide channel 30 'is discharged to the outside through the outlet 31c connected to one end 30'b, and the water level measuring means formed at the outlet 31c measures and controls the water level surface of the water flowing out. Transmission to the means 90, and the control means 90 receives and stores it. The measuring means 40 provided below the outlet 31c measures the amount of fall (weight) of freely falling water through the outlet 31c, and as a result, transmits the flow rate data to the control means 90, and the control means. 90 receives flow rate data from the measuring means 40.

When the flow rate of the water flowing out for each outlet 31c is different, the control means 90 receives different flow data, respectively, the control means 90 receives the respective flow data from the measuring means 40 Compare each other to calculate the relative difference. When the flow rate difference is generated, a closing command is sent to the inlet opening / closing means 21b or the second opening / closing means corresponding to the outlet 31c with excessive flow rate, thereby closing at least one selected from the inlet 21a or the second inlet 31a. Adjust In the same or similar manner as described above, the control means 90 transmits an opening command to the inlet opening / closing means 21b and the second opening / closing means of the outlet 31c having a small flow rate so that the inlet 21a or the second The inlet cross-sectional area of the inlet 31a is increased. At this time, the control means 90 receives the water depth of the guide channel 30 'from the measuring means as water level data and collectively controls the opening and closing means 21b and the second opening and closing means by combining the received flow rate data. As a result, the relative flow rate difference can be confirmed. In addition, it is apparent that the inlet opening and closing means 21b and the second opening and closing means are used as one embodiment of the present invention, and may include any one or all selected.

In the flow control system according to the present invention, the flow rate of each structure is measured and the result is transmitted to the control means 90 in real time, and the control means 90 compares and analyzes the transmitted data to calculate a relative flow rate difference. The means are operated to control the flow rate difference to be minimized. In addition, the flow rate control of the present invention is to control the inflow flow rate, for example, it is possible to simply adjust the inflow amount by adjusting the inflow cross-sectional area of the inlet port (21a).

In addition, as shown in FIG. 4, the outlet flow rate is measured at the outlet side, and as a result, the control means 90 receives the data, adjusts the inflow flow rate at the inlet side, and measures the flow rate changed therefrom. Thus, the measurement and control are repeatedly circulated to sequentially apply the flow rate difference for each structure to be equal to or less than a predetermined set value.

Although the flow control system of the water treatment facility according to the present invention has been described above, the modified or changed equivalent structure by those skilled in the art does not depart from the spirit or scope of the invention described in the claims. It extends to all the cases to which the technical idea of the present invention is applied.

The flow control system of the water treatment facility according to the present invention has the effect of accurately measuring the treatment flow rate, in particular, the relative flow rate by measuring the flow rate using the drop amount of the fluid and the fresh water surface height, and analyzing the measured flow rate in real time. This has the effect of controlling the flow rate.

In addition, the flow rate is minimized, and even when the flow rate fluctuates, it is effective to achieve an even distribution of the flow rate by controlling the flow rate flowing into each structure to minimize the occurrence of the relative flow difference.

1a to 1b are perspective views showing the water treatment structure of the present invention.

2A to 2B are sectional views taken on line A-A 'and B-B', respectively, in Fig. 1A;

3 is a block diagram showing a flow control system of the present invention.

4 is an explanatory diagram showing a flow rate distribution at the time of flow rate distribution in a distribution channel.

<Explanation of the code | symbol about the main part of drawing>

10: distribution channel 20: water treatment first structure

21a: inlet 21b: inlet opening and closing means

30: second water treatment structure 31c: outlet

30 ′: Guideway 33: Support

40: measuring means 90: control means

Claims (5)

A water treatment first structure in which an inlet for introducing water from the outside and an inlet opening and closing means for opening and closing the inlet are formed; A water treatment second structure in which water discharged from the water treatment first structure is introduced and an outlet for introducing the water flows out; Measuring means formed at a lower portion of the outlet and measuring flow rate data of water flowing out of the outlet and falling freely; And a control means electrically connected to the measuring means and the opening and closing means, respectively, for controlling the operation of the inlet opening and closing means by receiving flow data from the measuring means. The method according to claim 1, The outlet is further provided with water level measuring means for measuring the water level of the water immediately before the outlet from the outlet, The control means is electrically connected to the measuring means receives the water level data from the measuring means to control the operation of the opening and closing means, characterized in that for controlling the flow of the water treatment facility. The method according to claim 1 or 2, The measuring means is a scale and the flow rate data is the weight of the free-falling water. The method according to claim 1 or 2, The water treatment second structure further includes a second inlet through which water flows out of the first water treatment structure and a second opening / closing means for opening and closing the second inlet. And said control means is electrically connected to said second opening and closing means to control the operation of said second opening and closing means. The method according to claim 1 or 2, One end is inclined inside the second water treatment structure, and the other end has a guide channel in which an inner end surface is circumscribed at the outlet. Water flow in the water treatment facility, characterized in that the fresh water in the second structure of the water flows through the outlet through the overflow to the guide channel.