JP2863697B2 - Continuous measurement system for mud concentration - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device for continuously and stably measuring the amount of solids in muddy water in a step of performing a solid-liquid separation process.

[0002]

2. Description of the Related Art In the step of performing a solid-liquid separation treatment of muddy water, it is important to measure the amount of solids in the muddy water, that is, the concentration of the muddy water, in determining the amount of the treatment chemical to be added. There are various methods for measuring the muddy water concentration according to the prior art, such as an electric method, a weight measuring method, and a sensor method.
The muddy water discharged by the civil engineering foundation work has a very high SS concentration, the specific gravity of the muddy water is 1.3 to 1.4, and the muddy water contains cement milk or bentonite. Clogging or soiling is likely to occur, which makes it difficult to continuously and accurately measure the concentration of muddy water.

[0003]

The problem to be solved by the present invention is that, in the step of dehydrating muddy water, the concentration of the muddy water is continuously and accurately controlled in order to control the amount of chemical added by the chemical injection device. It is an object of the present invention to provide a measuring device capable of measuring.

[0004]

Means for solving the problem in the present invention is to provide a measuring pipe formed in a non-straight pipe shape with a transparent material through a supply pipe for supplying muddy water and a soft pipe. Connect and connect the outlet to the muddy water reactor,
Place the measuring tube on an automatic balance connected to a computer,
The weight of the mud passing through the measuring pipe is measured, and a numerical signal obtained by the measurement is arithmetically processed by the computer to measure the mud concentration, and the supply path of the processing chemical to be supplied to the mud reaction tank based on the numerical value. The measuring tube is characterized by controlling the discharge amount of a chemical injection pump provided in the above, and the measuring tube includes a portion having a different inner diameter of the tube body in a spiral shape or a straight tube portion.

[0005]

[Operation] The measuring tube 1 is placed on the automatic balance 5 together with the holder 2,
Next, water is passed from the washing water supply pipe 12 into the measurement pipe 1. At this time, the weight of the entire tube is detected by an automatic weigher, and its numerical signal is set to “1”. Next, the first valve 13 is closed to discharge the washing water, and the second valve 14 is opened to supply the muddy water into the measuring pipe 1. Since the muddy water is heavier than water, when the muddy water is filled into the measuring tube 1, the numerical signal detected by the automatic weigher is "1 or more". The computer 10 calculates and compares the numerical signals measured by the automatic weigher 5 to measure the muddy water concentration, and controls the discharge amount of the chemical injection pump 11 connected to the chemical tank 19 according to the muddy water concentration. Therefore, the concentration of the muddy water directly supplied from the muddy water supply tank 6 to the muddy water reaction tank 9 through the bypass pipe 15 can be measured in real time, so that the amount of the treatment chemical added in the muddy water reaction tank 9 can be accurately determined. You can control.

[0006]

FIG. 1 is a block diagram of a measuring apparatus, and FIG. 2 shows a measuring pipe through which muddy water passes. A measuring tube 1 for measuring the concentration of muddy water is formed in a spiral shape from transparent glass or transparent hard plastic, and is connected and fixed to a tower-shaped holder 2 by a stopper 3. The measurement tube 1 has a higher position as a supply port 1a and a lower position as a discharge port 1b. The diameter and the helical pitch of the measuring pipe 1 are appropriately selected depending on the properties of the muddy water to be treated, so that the whole muddy water whose concentration is to be measured passes through the pipe smoothly. The holder 2 is assembled on the upper surface of the base plate 4.

In FIG. 1, a measuring tube 1 is mounted on an upper surface of an automatic balance (load cell) 5 held by a holder 2, and a supply port 1a is connected to a supply tube 7 of a muddy water supply tank 6 for storing muddy water. They are connected via a soft tube 8 made of rubber or soft plastic. Further, the outlet 1b is connected to a muddy water reaction tank 9 for mixing the muddy water and the chemical. The value measured by the automatic balance 5 is sent to a computer 10, which measures the SS concentration in the muddy water, and continuously controls the discharge amount of the chemical injection pump 11 based on this numerical value.

Reference numeral 12 denotes a washing water supply pipe connected to the supply pipe 7 of the muddy water supply tank 6 and has a first valve 13. Reference numeral 14 denotes a second valve provided in the supply pipe 7.
The muddy water supply tank 6 and the muddy water reaction tank 9 are connected by a bypass pipe 15, and the muddy water in the muddy water supply tank 6 is directly supplied to the muddy water reaction tank 9. Reference numeral 16 denotes a stirring propeller for stirring the inside of the muddy water supply tank 6, the shaft of which is rotationally driven by a motor 17. Reference numeral 18 denotes a pump for supplying muddy water to the muddy water supply tank 6, and reference numeral 19 denotes a third valve provided near the outlet 1b of the measuring pipe 1.

The chemical injection pump 11 is connected to a chemical tank 20 and is driven to rotate by a motor 21. A chemical supply pipe 22 connected to the chemical injection pump 11 is connected to the muddy water reaction tank 9. In addition, chemicals such as a coagulant, a coagulant, and a neutralizer are added to the muddy water. The muddy water reaction tank 9 is provided with a stirring screw 24 that is driven to rotate by a motor 23. Further, a muddy water outlet 25 provided at an end of the muddy water reaction tank 9 is used for the next dewatering process. It is a connection port to the process.

[0010] The measuring device has the above configuration, and a measuring method will be described next. First, the measuring tube 1 is placed on the automatic balance 5 together with the holder 2, then water is passed from the washing water supply tube 12 into the measuring tube 1, and the weight of the whole tube at this time is detected by the automatic balance 5, and the numerical value is obtained. Let the signal be "1". Next, the first
Is closed to discharge the washing water from the measuring pipe 1, and the second valve 14 is opened to supply the muddy water in the muddy water supply tank 6 into the measuring pipe 1. When muddy water passes through the measuring pipe 1 and does not stay in the pipe, the third valve 19 is closed to store the muddy water in the pipe. Since the muddy water is heavier than water, when the muddy water is filled into the measuring tube 1, the numerical signal detected by the automatic weigher 5 is "1 or more".

A computer 10 computes and compares the numerical signal of the muddy water weight measured by the automatic balance 5 to measure the muddy water concentration, and the chemical pump 19 connected to the chemical tank 19 based on the measured muddy water concentration numerical signal. Is controlled. Therefore, the concentration of the muddy water directly supplied from the muddy water supply tank 6 to the muddy water reaction tank 9 through the bypass pipe 15 can be measured in real time, so that the amount of the treatment chemical added in the muddy water reaction tank 9 can be accurately determined. You will be able to control it.

After the muddy water accumulates in the measuring pipe 1, the third valve 19 is opened to supply the muddy water continuously. Since the measuring pipe 1 has a helical shape, the flow velocity of the muddy water passing through the inside of the pipe is lower than that flowing through the straight portion and stays in the pipe, so that the weight of the muddy water can be measured during this time. Further, since the muddy water is continuously passed, the weight (concentration) of the muddy water can be continuously measured. Further, since the measuring tube 1 is formed of a transparent material, when the inside of the tube becomes conspicuous, the washing water is supplied from the washing water supply tube 12 to wash the inside of the tube. Furthermore, since the measuring pipe 1 is connected to the supply pipe 7 of the muddy water supply tank 6 via the soft pipe 8, even if the measuring pipe 1 moves in the vertical direction due to a change in the weight of the measuring pipe 1, accurate measurement pipe 1 can be obtained. Can measure.

FIG. 3 shows an embodiment of the measuring tube.
7 is a side view of the first embodiment, B is a side view of the second embodiment, and C is a side view of the third embodiment. Among them, the first embodiment is as described above, and therefore detailed description is omitted.

The second embodiment is the same as the first embodiment in that the measuring tube 101 has a helical shape.
01b is provided at a position higher by a height h than the position of the lowermost tubular body formed in a spiral shape, thereby improving the muddy water retention effect. or,
The third embodiment is characterized in that the measuring pipe 201 is a straight pipe and the inner diameter of the pipe body is formed alternately by repeating a small diameter part and a large diameter part in the middle, thereby improving the muddy water retention effect. I try to make it.

In the second and third embodiments, a valve (not shown) can be provided near the discharge ports 101b and 201b. In this case, the retention of muddy water can be adjusted. Is optional.

Although the weight is measured by placing the measuring tube 1 on the automatic weigher 5 in the embodiment, it is also possible to carry out the measurement while being suspended via the automatic weigher 5.

[0017]

According to the present invention, since the amount of solids in muddy water can be continuously measured, the amount of the chemical required for muddy water treatment can be automatically controlled based on the measured value. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an apparatus for measuring a muddy water concentration.

FIG. 2 is a perspective view of a measurement tube.

FIG. 3 is a side view showing an embodiment of a measuring tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Measuring pipe 1a Supply port 1b Discharge port 2 Holder 3 Stopper 4 Base plate 5 Automatic weighing 6 Muddy water supply tank 7 Supply pipe 8 Soft pipe 9 Muddy water reaction tank 10 Computer 11 Chemical pump 12 Washing water supply pipe 13 First valve 14 second valve 15 bypass pipe 16 stirring propeller 17 motor 18 pump 19 third valve 20 chemical tank 21 motor 22 drug supply pipe 23 motor 24 stirring screw 25 muddy water outlet 101 measuring pipe 101a supply port 101b of the second embodiment Discharge port 201 Measurement pipe 201a of third embodiment Supply port 201b Discharge port

Claims (9)

(57) [Claims] 1. A measuring pipe (1, 101, 20) formed of a non-straight pipe made of a transparent material to measure a solid content of a mud in a step of performing a solid-liquid separation treatment of the mud.
1) supply port (1a, 101a, 201a) of the supply pipe for supplying muddy water (7) is connected via a flexible tube (8) the outlet (1b, 101b, 201b) mud reaction vessel (9)
Automatic balance connected to the computer (10) is connected to (5) has been placed, the automatic balance (5)
Weight of mud through within the measuring tube (1, 101, and 201) is measured by a numerical signal obtained by the measurement
Chemical feeding, chemical dosing but provided with being the arithmetic processing by the computer (10) mud <br/> water concentration is measured, the supply passage of a drug for the treatment supplied to the muddy water reactor (9) in response to the concentration continuous measurement device mud density discharge rate of the pump (11) is being controlled. 2. An outlet of a measuring pipe (1, 101, 201).
In the vicinity of (1b , 101b, 201b), a valve (1
9. The method according to claim 1, wherein 9) is measured.
Continuous measurement equipment for muddy water concentration . 3. The measuring tube (1, 101) is formed in a spiral shape.
The mud according to claim 1 or 2, wherein
Continuous measurement device for water concentration . 4. An outlet (101b) of the measuring tube (101).
4. The continuous measuring apparatus for muddy water concentration according to claim 3 , wherein is provided at a position higher than a position of a lowermost tubular body formed in a spiral shape. 5. A measuring tube (201) is, according to claim 1 or 2, characterized in that different from the portion of the middle tube of the inner diameter of a by straight pipe portion a straight tube is formed Continuous measurement equipment for muddy water concentration. 6. The continuous measuring apparatus for muddy water concentration according to claim 1, wherein the measuring pipe (1, 101, 201) is made of transparent glass or transparent hard plastic. 7. A supply port of the measuring tube (1, 101, and 201) (1a, 101a, 201a) wherein the connected flexible tube is (8), characterized in that it is formed by a rubber or soft plastic Item 7. A continuous measuring device for muddy water concentration according to any one of Items 1 to 6 . 8. The cleaning water supply pipe (12) is connected to a supply pipe (7) for supplying muddy water to the measurement pipe (1, 101, 201). Continuous measurement equipment for muddy water concentration. 9. A method for measuring the amount of solids in muddy water in a step of performing a solid-liquid separation treatment of muddy water, comprising a measuring tube (1, 1) formed of transparent glass or transparent hard plastic and formed in a spiral shape. 101) is a supply port (1a, 101).
a) a mud supply tank (6) supply pipe (7) in rubber or soft tube formed of a soft plastic (8) is connected via an outlet (1b, 101b, 201b) mud reaction vessel (9) is connected to the washing water supply pipe washing water feeding Kyusuru supply pipe (7) of the muddy water supply tank (6) (12) is connected
Is, the muddy water supply tank (6) and the mud reaction vessel (9) and are connected by a bus <br/> bypass pipe (15), the drug supply pipe chemical tank (20) to the muddy water reactor (9) ( 22) is connected on the way via the chemical injection pump (11), and the measuring tube (1, 101) is fixed to the holder (2) and
Also placed on the over motor (10) and connected to an automatic weighing (5)
The measuring tube (1, 1 ) is set by the automatic scale (5).
01) The weight of mud passing through is measured , and
The obtained numerical signal is obtained by the computer (10).
The muddy water concentration is measured by the arithmetic processing, and the chemical injection pump (11) of the chemical supply pipe (22) according to the concentration.
A continuous measuring device for the concentration of muddy water, wherein the discharge amount of the slurry is controlled .