CN111707583A

CN111707583A - Dispersion coefficient measuring device

Info

Publication number: CN111707583A
Application number: CN202010611791.7A
Authority: CN
Inventors: 夏玉宝; 王�华; 金意倩; 袁伟皓; 曾一川; 李丰铎; 张晓兰
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2020-09-25

Abstract

The invention discloses a dispersion coefficient measuring device, which comprises a mixing box for mixing a tracer and water, wherein the outlet of the mixing box is connected with a pipeline, the pipeline is provided with a measuring device which is communicated with the pipeline and is used for measuring the change of the content of the tracer in the water along with time, and a control system which is connected with the mixing box and the measuring device. According to the invention, only a corresponding water sample needs to be collected in the field, and the water sample is brought back, so that the dispersion coefficient is measured by using the device, and compared with the traditional method for measuring the dispersion coefficient in the field, the method reduces the workload, and is time-saving and labor-saving.

Description

Dispersion coefficient measuring device

Technical Field

The invention relates to a measuring device, in particular to a dispersion coefficient measuring device.

Background

The dispersion coefficient represents an index of the dispersion phenomenon when the soluble substance passes through the osmotic medium. In the research on the characteristics of the pollutants, the dispersion conditions of the pollutants in different water bodies are investigated, and the method has important effects on obtaining dispersion performance parameters of the water bodies, purifying effects of the pollutants in the water bodies, migration rules of the pollutants and the like. The determination of the dispersion coefficient mostly adopts the dispersion curve of the tracer in the aquifer to solve, the measurement in the field is time-consuming and labor-consuming, the related data is difficult to measure, and the deviation of the measurement work is easy to cause.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a time-saving and labor-saving dispersion coefficient measuring device which can measure the dispersion coefficient without being in the field.

The technical scheme is as follows: the invention discloses a dispersion coefficient measuring device, which comprises a mixing box for mixing a tracer and water, wherein an outlet of the mixing box is connected with a pipeline, the pipeline is provided with a measuring device which is communicated with the pipeline and is used for measuring the change of the content of the tracer in the water along with time, and a control system which is connected with the mixing box and the measuring device.

In order to measure the change of the content of the tracer in the water along with the time conveniently, the measuring device is a measuring well; a support is fixed above the measuring well, and a detector which extends into the measuring well and is used for detecting the activity is connected below the support through a lifting device; the lifting device comprises a pulley suspended in the support, the detector is wound on the pulley through a cable, and the detector is connected with the cable and a control system respectively and is used for controlling the depth of the detector.

In order to facilitate mixing the radioactive tracer with water, the mixing box comprises a storage bin for storing the radioactive tracer and a mixing bin for mixing the tracer with water, a gate for outputting the tracer to the mixing bin is arranged on the storage bin, and the gate is connected with a control system.

In order to monitor the water quality condition, a water quality monitor for monitoring the water quality is arranged on the inner wall of the measuring well.

In order to play a role in buffering water flow in the device and stabilize the water level of the measuring well, a buffer tank is arranged at a water outlet of the pipeline.

In order to increase the accuracy of measurement, the measuring wells are arranged on the pipeline in a plurality of numbers, and the measuring wells are arranged at intervals or in a crossed manner.

In order to increase the mixing effect, a stirrer for stirring is arranged in the mixing bin.

In order to control the mixing box to convey liquid into the pipeline, the inlet and the outlet of the pipeline are respectively provided with a control valve.

In order to better convey the liquid to the mixing box, a water pump for conveying water to the mixing box is connected to a water inlet of the mixing box.

Has the advantages that: compared with the prior art, the invention can obtain the following beneficial effects: 1. as the invention only needs to collect corresponding water sample in the field and bring the water sample back, the dispersion coefficient is measured by using the invention, compared with the traditional method for measuring the dispersion coefficient in the field, the method reduces the workload and saves time and labor. 2. The method is used for measuring the dispersion coefficient of the water body, is beneficial to investigating the dispersion condition of pollutants in different water bodies, and has important effects on obtaining the dispersion performance parameters of the water body, purifying the water body pollutants, transferring the pollutants and the like. 3. The dispersion coefficient is measured in a laboratory, and experimental water can be treated in a centralized and harmless manner, so that environmental pollution caused by disordered discharge is avoided.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a mixing box of the present invention;

fig. 3 is a schematic structural diagram of a measurement well of the present invention.

Detailed Description

The invention is described in further detail below with reference to the drawings.

As shown in fig. 1-3, the diffusion coefficient measuring device of the present invention comprises a mixing box 2 and a control system 20, wherein the mixing box 2 is used for mixing a tracer with water, the mixing box 2 comprises a storage bin for storing a radioactive tracer, a mixing bin 16 is arranged beside the storage bin and is used for mixing the tracer with water, a stirrer 18 for stirring is arranged in the mixing bin 16, a gate 17 for outputting the tracer to the mixing bin 16 is arranged on the storage bin, the gate 17 is connected with the control system 20, the concentration of the radioactive tracer can be set through the control system 20, and the opening and closing of the gate 17 are controlled; the water inlet 15 of the mixing box 2 is connected with a water pump 1 which conveys water to the mixing box 2; a water outlet 19 of the mixing box 2 is connected with a pipeline 5, the pipeline 5 is an underdrain, an inlet and an outlet of the underdrain are respectively provided with a control valve 3 which is an electromagnetic valve, the underdrain is provided with a measuring device 4 communicated with the underdrain, the measuring device 4 is used for measuring the content of the tracer in water along with time change, the measuring device 4 is a measuring well, a support 9 is fixed above the measuring well, a pulley 7 is hung below the support 9, the pulley 7 is a fixed pulley, a detector 10 is wound on the fixed pulley 7 through a cable 8, the detector 10 extends into the measuring well for detecting radioactivity, and the other end of the cable 8 is connected with a motor 12 for controlling the depth of the detector 10 extending into the measuring well; the motor 12 is respectively connected with a power supply 13 and a control system 20; the control system 20 can use the rotation of the motor 12 to pull the cable 8, and then control the probe to move up and down continuously through the fixed pulley 7 fixed on the bracket 9; a water quality monitor 11 for monitoring water quality is arranged on the inner wall of the measuring well; a plurality of measuring wells are arranged on the pipeline 5, the plurality of measuring wells are arranged at intervals or are crossed in a cross shape, and the number and the positions of the measuring wells can be customized by self; the delivery port of underdrain is equipped with baffle-box 6, and baffle-box 6 can play the cushioning effect to the rivers in the device for the water level of stable survey well.

The working process is as follows: before use, radioactive tracer particles or stock solution for the experiment are placed in advance in a storage bin, and the concentration parameters of the tracer are input into the control system 20 while sufficient water for detection is prepared. During the use, open the exit control valve 3 of underdrain, advance the underdrain through the tubing pump with water pump 1 to water, pay close attention to the quality of water condition that measures water quality monitoring instrument 11 and detect constantly, treat that quality of water is stable after, adjust control valve 3, the velocity of flow of control rivers, guarantee that the water level in the measuring well keeps unchangeable basically, start mixing box 2, according to the concentration parameter of control system input in advance, open gate 17, release the granule of target volume or the radioactivity tracer stoste of target volume gets into mixing bunker 16, agitator 18 can be opened to control system 20 simultaneously, make tracer and water intensive mixing, the tracer water of mixture flows into the underdrain through the pipeline. After a certain time, the shutter 17 is closed and the same flow is applied by the water pump 1The non-tracer pump 1 is driven into the underdrain to propel the tracer water. After the tracer water is injected, the control system 20 can use the rotation of the motor 12 to pull the cable 8, then the fixed pulley 7 fixed on the bracket 9 is used to control the probe to continuously move up and down, the probe is used to measure the radioactivity along the whole well depth, the probe measures the activity through the process of the solid medium flickering, the sent pulse is transmitted to a computer through the cable 8 to observe the change of the content of the tracer agent in the water along with the time, the three observation wells can simultaneously carry out the operations, and the dispersion coefficient can be calculated according to the observation data. Br is usually used⁸²And I¹³¹As a tracer. Br⁸²: the half-life period is 36h, and the energy peak value is 0.78-1.47 MeV; i is¹³¹: the half-life period is 8.04d, and the energy peak value is 0.3-0.64 MeV. After the device uses, wash the device, wash totally in order to use next time, concentrate to the water of survey in-process and wash the water and carry out innocent treatment after discharging into municipal pipeline simultaneously.

Claims

1. The utility model provides a diffusion coefficient survey device, its characterized in that, is including being used for mixing box (2) with tracer and water mixture, the exit linkage of mixing box (2) has pipeline (5), be equipped with on pipeline (5) and be used for measuring device (4) of aquatic tracer content change with time with pipeline (5) intercommunication, with control system (20) that mixing box (2), measuring device (4) are connected.

2. The apparatus for determining diffusion coefficient according to claim 1, wherein the measuring device (4) is a measuring well, a support (9) is fixed above the measuring well, and a detector (10) extending into the measuring well for detecting radioactivity is connected below the support (9) through a lifting device.

3. The device for determining the diffusion coefficient according to claim 2, wherein the lifting device comprises a pulley (7) suspended in the bracket, the detector (10) is wound on the pulley (7) through a cable (8), and a motor (12) which is respectively connected with the cable (8) and a control system (20) and is used for controlling the depth of the detector (10) is arranged.

4. The diffusion coefficient measuring device according to claim 1, wherein the mixing box (2) comprises a storage bin (14) for storing the radioactive tracer, a mixing bin (16) for mixing the tracer with water, wherein a gate (17) for outputting the tracer to the mixing bin (16) is arranged on the storage bin (14), and the gate (17) is connected with the control system (20).

5. The apparatus for determining diffusion coefficient according to claim 1, wherein a water quality monitor (11) for monitoring water quality is provided on the inner wall of the measuring well.

6. The apparatus according to claim 1, wherein the outlet of the conduit (5) is provided with a buffer tank (6).

7. The apparatus for determining diffusion coefficient according to claim 2, wherein the plurality of measurement wells are provided on the pipe (5) at intervals or in a criss-cross arrangement.

8. The apparatus according to claim 1, wherein a stirrer (18) for stirring is provided in the mixing chamber (16).

9. The apparatus for determining diffusion coefficient according to claim 1, wherein the inlet and outlet of the pipe (5) are respectively provided with a control valve (3).

10. The apparatus according to claim 1, wherein a water pump (1) for supplying water to the mixing tank is connected to a water inlet of the mixing tank.