KR20130044435A - A test method and measuring apparatus for particle deposition losses for sample transport tubes - Google Patents

Abstract

PURPOSE: An apparatus for loss measurement by particle deposition in a sampling conveyance pipe is provided to increase reliability of measurement by implementing continuous monitoring. CONSTITUTION: A light source generation unit(14) is installed in the outside of a pipe direct-coupled type particle counter. The light source generation unit irradiates light perpendicular to an axial direction of a conveyance pipe(10). A photometer(15) is installed in the same plane as the light source generation unit. The photometer measures a degree of scattering of light generated by sample particles. A calculation and signal processing unit(16) calculates the number of particle samples. [Reference numerals] (AA) Shroud nozzle; (BB) Analyzer; (CC) Microprocessor

Description

A TEST METHOD AND MEASURING APPARATUS FOR PARTICLE DEPOSITION LOSSES FOR SAMPLE TRANSPORT TUBES}

The present invention upstream and downstream of the measurement section of the sampling transport pipe to be measured to measure the amount of loss (or 'loss rate', hereinafter referred to as 'loss amount') due to particle deposition in the sampling transport pipe. A pipe direct particle counter connected directly to the pipe using a fitting or a flange at a specific location in the downstream stream can be used to measure the amount (or loss rate) of the sample transfer pipe by simultaneously counting and measuring the particle sample passing through the pipe. In more detail, the present invention relates to a pipe-directed particle counter made to the size of the sampling transport pipe at an angle of 90 degrees to the light source installed perpendicular to the axis center of the sampling transport pipe. Modularized in one package with the installed photometer, directly fitting or flanged to the measuring position of the sample transfer pipe It relates to a device installed.

Exhaust systems, such as nuclear power plants, radioactive waste treatment facilities, nuclear fuel handling buildings, and radioisotope treatment facilities, collect and transport samples with nozzles for sampling particles for the purpose of monitoring radioactive particles leaking from the nuclear facility to the outside. Sampling is installed in real time to see if radioactive particles leak to the outside by installing pipes.

Sampling and transfer pipe that transfers the sample to the analyzer after sampling in the sampling process of the above sample is necessary to install various sizes of valves or fittings, or bending during piping work, so resistance is dependent on the length or installation shape of the pipe. (resistance) caused by the increase of particle deposition phenomenon has raised the concern about the sample loss rate due to particle deposition, the basic research in the related field has been progressed so far, but in addition to the evaluation of the design results, site assessment In some cases, it is difficult to select the exact amount of loss even if the layout is different from the design drawing. In addition, no suitable method for measuring and evaluating the deposition losses of sampling transport pipes is proposed, so it is necessary to rely on calculations using programs built around experimental data for specific piping conditions, In order to directly sample a particle sample at a location, a particle counter is connected between the pipes to measure the number of particles passing through the sample transfer pipe, but this installation method itself is not only a cause of loss in the pipe but also additional Problems such as work required is not solved.

Among these methods, T-shaped three-way valves and pipes are installed at specific positions upstream and downstream of the sampling transport pipe, and a particle counter is sampled by installing a conventional particle counter on the T-shaped valve to measure the number of particles contained in the sample. Or measuring particle counters of the same specification on the upstream and downstream measuring taps at the same time is very difficult to meet the isokinetic sampling conditions of the particle sample passing through the sampling and transport piping, so that the particles to be sampled have representative characteristics. It is disadvantageous that the error of the counter or the installed particle counter itself is connected to the uncertainty of the measured value, or the measurement error is large because the measurement is not performed simultaneously at the upstream and downstream locations.

In addition, there is a method of picking up the sampling pipe from the upstream and downstream measuring taps or installing a conventional T-shaped or three-way sampling tap. It affects the sample flow and acts as a resistance to the sample flowing in the sample transfer pipe, which makes it difficult to evaluate the exact loss amount and is a very inconvenient method for installing the measuring instrument.

In addition, using a non-contact measuring device to measure the loss rate of the pipe by installing a non-contact measuring device outside the sampling transport pipe, this method, even in a non-contact method, the penetrations on both side walls of the pipe In addition, it is necessary to manufacture and install the light emitting part and the light receiving part. In addition to the additional work such as processing, the measurement equipment is complicated, and the installation is inconvenient, and the cost of implementation is high and the operator requires a high level of skill. There is a limit to the application to pipes of the same diameter.

FIG. 1 shows a dust concentration meter of a conventional German DURAG company (D-R300 / DR 300-40) installed in a piping system such as a large duct or a stack. It has a structure in which a particle counter, that is, a light trap 102 and a pair measuring instrument 103 are mounted.

Figure 2 shows a conventional loss amount measuring method and apparatus for counting the particles passing through the particle counter by installing a three-way valve in the pipe for measuring the sampling rate of the sampling transfer pipe, and measures the speed of the fluid flowing in the duct 201 The shroud nozzle 302 which samples a particle sample from the sensor 302 and the duct 301 is provided. The shroud nozzle 302 extends the sampling transport pipe 304 extending out of the duct 301, and the sampling transport pipe 304 is connected to a vacuum pump through a three-way valve 305. It is connected to a particle counter.

Therefore, the processor PC connected to the particle counter 305 uses the particle count average value for various shapes of the sampling transfer pipe 304 installed at the rear end of the shroud nozzle 303 when the sampling flow rate is the same. It is a method that can calculate the loss rate for each particle for each type (length or shape) of the sampling transport pipe 304. In this case, the loss rate is based on a particle measurement value measured at the end of the shroud nozzle 303 in a state in which the sampling transport pipe 304 is not connected.

However, the conventional methods including the methods disclosed in FIGS. 1 and 2 mentioned above are cumbersome to adjust the measurement conditions every time when the sampling amount sampling from the duct through the sampling transfer pipe is changed or the usage or operating conditions are changed. Not only this, but also the influence of resistance such as the duct or sampling transfer pipe installation shape cannot be ignored, and the transfer pipe is simultaneously measured using the same device without any influence on the flow of the sample flowing in the pipe. There is a problem that accurate measurement of the amount of loss is difficult.

Domestic Patent Publication No. 10-2005-0018352 (published on Feb. 23, 2005) Korean Patent Publication No. 10-2001-0094323 published on 31 October 2001

The present invention for solving the conventional problems as described above by installing a pipe direct type particle counter as a measuring device at each measurement point of the sample transfer pipe passing the particle sample by fitting or flange coupling for the pipe size, It is a method that can measure the number of particle samples passing through at the same time, and it is easy to install the device and does not affect the internal flow characteristics of the sampling transport pipe. Its purpose is to describe a device for evaluating and measuring losses.

In addition, the present invention by installing a measuring device including a pipe direct type particle counter irrespective of the position or number on the sample transfer pipe, simultaneously measuring the amount of loss for a specific region of interest to know the loss rate in the sample transfer pipe The purpose of this study is to provide useful information needed to change the design of transport pipes when the loss of sampling pipes does not meet the design requirements.

Apparatus for measuring the amount of loss by particle deposition in the sampling transport pipe according to the present invention for achieving the above object, directly connected to the upstream and downstream of the sample transport pipe (sample transport tpbe) An in-line pipe direct particle counter; A light source generator installed outside the pipe direct particle counter and irradiating light perpendicular to an axial direction of the sample transfer pipe; It is installed orthogonal to the same section as the light source and installed outside the pipe direct particle counter vertically perpendicular to the axial direction of the pipe direct particle counter to pass through the sample collection transport pipe by the light generated by the light source generating unit. A photometer for measuring the scattering degree of light generated by the sample particles; And calculating the number of particle samples flowing in the sampling transport pipe from the correlation between the magnitude of the voltage and the number of particles representing the degree of scattering preprogrammed based on the magnitude of the voltage measured by the photometer. It characterized in that it comprises a signal processing unit.

Since the pipe direct particle counter is transparent and the inner surface has very low roughness (Quartz) or glass, it is made of tubular shape, so that the scattering degree is irradiated by irradiating light such as laser in the pipe direct particle counter where the particle sample is moved. It can be measured.

The pipe direct particle counter is fitted to the upstream and downstream of the sample transport pipe, and the sample transport pipe and the pipe direct particle counter are connected to have the same inner diameter. By changing the flow characteristics and not affecting the behavior of the particle sample, the pipe-type particle counter, a measuring device, has little influence on the flow of the sample in the sampling pipe.

Alternatively, the pipe direct particle counter is flanged upstream and downstream of the sample transport pipe, so that the sample transport pipe and the pipe direct particle counter are connected to have the same inner diameter. By changing the cross-sectional area, the flow characteristics change and do not affect the behavior of the particle sample, so that the pipe-type particle counter, a measuring device, has little effect on the flow of the sample in the sampling pipe.

Since the sampling transport pipe and the pipe direct particle counter have the same inner diameter, the sample transport pipe and the pipe direct particle counter do not affect the behavior of the sample moving through the particle counter.

Since the pipe direct particle counter has a window for visually observing the particle sample in the pipe direct particle counter, the sample flows from the outside to the naked eye as necessary, i.e., the sample flow in the pipe direct particle counter. The phenomenon can be observed.

As the light source generator for irradiating the light, a laser generator or LED for generating a laser may be used.

The light source generating unit has a lens that can diffuse and collect the light irradiated to the sampling transport pipe and a slot deliberately processed to allow the light to pass through, so that the light source generator has a surface perpendicular to the axis of the sampling transport pipe. It is possible to accurately observe the behavior of the particle sample flowing inside the pipe-type particle counter by irradiating the light source forming the surface.

Since the sample transfer pipe has a circular or rectangular cross section, it is easy to install a light source and a photometer and accurately observe the behavior of the particle sample flowing through the sample transfer pipe.

The piping direct type particle counter, the light source and the photometer are modularized into a single package and installed at the same time at the required installation position of the sample transfer pipe or at least one or more places other than the required installation position of the sample transfer pipe. Simultaneously measuring the coefficient for the particle sample flowing through the pipe by installing it at the installation target location, it is possible to measure the amount of sample loss of each section of the transfer pipe due to particle deposition.

The voltage according to the amount of scattered light measured by the optical measuring means including the photometer may be transmitted to a computer such as a microprocessor through a RS232 communication port, a remote transmission line, or a separate transmission line, and processed for data. .

Therefore, according to the present invention, the pipe direct particle counter is installed in a pipe direct type particle counter by fitting or flange coupling to the measurement site of the sample transfer pipe, and the light source generating unit outside the pipe direct particle counter. And photometers are modularized and installed so that they can be connected directly to the pipes without any additional machining work on the pipes.The installation is simple, compact, and permanently installed in the sampling pipe. Continuous monitoring is possible.

In addition, the present invention is provided with a window for visualizing the behavior of the particle sample passing through the pipe direct particle counter outside the pipe direct particle counter directly connected to the sample transfer pipe gas phase or flow through the sample transfer pipe There is an effect that can directly check the behavior of the particulate matter (particle sample).

In addition, the present invention by connecting the sampling transfer pipe and the pipe-type particle counter directly connected to the fitting or flange coupling does not form a stage for the jaw or other particles collide with the sample connection pipe and the pipe-type particle counter connected to the sample collection Since there is little resistance to the flow inside the transfer pipe, the mechanical error caused by the measuring means such as the pipe direct type particle counter or the sample transfer pipe can be minimized to increase the reliability of the measurement result compared to the conventional measurement method.

In addition, the present invention enables the installation of a measuring device including a pipe-type particle counter at any position of the sampling transport pipe that is determined to be necessary for measurement, so that a specific portion of the sampling transport pipe is expected to have a high particle deposition. By installing it directly on the sample, the accurate information on the amount of sample loss in the region of interest can be simultaneously measured, thereby providing information that can change the design of the conveying pipe.

1 is a view showing a dust concentration meter of a conventional German DURAG company (D-R300 / DR 300-40) installed in a piping system such as a large duct or a stack.
Figure 2 is a block diagram showing a conventional loss amount measuring method and apparatus for counting the particles passing through the particle counter by installing a three-way valve in the pipe for measuring the sampling rate of the sampling transfer pipe.
Figure 3a is a block diagram showing an apparatus for measuring the amount of loss due to particle deposition in the sampling transport pipe according to the present invention.
FIG. 3B is a schematic diagram showing the main parts of the present invention shown in FIG. 3A.
4 is a cutaway perspective view showing a fitting coupling structure of the sampling transport pipe 10 and the pipe direct-type particle counter 11.
FIG. 5 is a cutaway perspective view showing a flange coupling structure between the sampling transfer pipe 10 and the pipe direct-type particle counter 11.
Figure 6 shows that the pipe-mounted particle counter 11, the light source 14, and the photometer 15 are modularized into a single package so that the required installation positions (A) (D) and arbitrary installation of the sample transfer pipe (10) are installed. It is a figure which shows that it is installed in target position B, C, etc.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention And it should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 3a is a block diagram showing an apparatus for measuring the amount of loss due to particle deposition in the sampling transport pipe according to the present invention.

The present invention includes a light generating unit, a photometer 15, a calculation including a pipe direct type particle counter 11 and a light source generating unit 14 connected directly to the sampling transport pipe 10 as shown in FIG. 3A. And a display unit 26 for displaying the amount of loss measured by the signal processing unit 16 and the arithmetic and signal processing unit 16, and the like.

The pipe direct type particle counter 11 may be formed into a tubular shape of transparent quartz or glass in order to pass light such as a laser and observe the particle sample with the naked eye from the outside. In addition, the pipe direct type particle counter 11 is directly connected to the upstream 12 and the downstream 13 of the sample transport pipe 10, for this purpose, the pipe direct particle counter 11 is provided at both ends as shown in FIG. It has a stage 19 of larger diameter than the inner circumferential surface 20. In addition, the sampling transfer pipe 10 directly connected to the pipe-type particle counter 11 has a stage 18 having a diameter smaller than the inner circumferential surface 17 on the upstream 12 and the downstream 13, respectively, as shown in FIG. In these stages 18, fittings 21 are formed, respectively.

Therefore, when the pipe-connected particle counter 11 is directly connected to the upstream 12 and the downstream 13 of the sampling transport pipe 10, upstream of the sampling transport pipe 10 to both ends of the pipe-connected particle counter 11. (12) and the downstream (13) is coupled to the fitting 21, so that the sampling transport pipe 10 and the pipe-type particle counter 11 is coupled easily, furthermore, the sampling transport pipe 10 of the Since the inner circumferential surface 17 and the inner circumferential surface 20 of the pipe direct particle counter 11 are designed to have the same diameter, the behavior of particles flowing through the sampling transport pipe 10 and the pipe direct particle counter 11 is affected. Do not give.

In addition, the pipe direct-type particle counter 11 has flanges 23 at both ends, as shown in FIG. 5, and the flanges 24 are disposed upstream 12 and downstream 13 of the sample transfer pipe 10 directly connected thereto. Since the pipe-type particle counter 11 can be coupled to the flanges 23 and 24 in the upstream 12 and downstream 13 of the sample transport pipe 10, the sample transport pipe 10 and the sample transport pipe 10 can be coupled to each other. It is easy to combine with the pipe direct particle counter 11, and furthermore, since the internal diameters of the sample feed pipe 10 and the pipe direct particle counter 11 are designed to be the same, the sample feed pipe 10 and the pipe There is no resistance to the sample particles flowing through the direct particle counter (11).

In addition, although not shown in the drawings, the pipe-type particle counter 11 has a window for visually observing particle samples in the pipe-type particle counter 11 with the naked eye. It is possible to visually observe the flow phenomenon of the sample particles in the transfer pipe 10, that is, the pipe direct-type particle counter 11.

The light source generator 14 and a photometer 15 which is paired with the light source generator 14 are installed outside the pipe direct particle counter 11. At this time, the light source generator 14 is a component such as a laser generator or LED, etc. of the pipe-type particle counter 11 so as to irradiate light perpendicularly to the axial direction of the sample transfer pipe 10 as shown in FIG. 3B. It is preferable to be installed outside, the photometer 15 (Photometer) is a measuring instrument for measuring the scattering degree of the light of the light source generating unit 14 and the particle in the sampling transport pipe 10 and the same cross section as the light source 14 It is preferable to be installed outside the pipe direct particle counter 11 orthogonal to and perpendicular to the axial direction of the pipe direct particle counter 11.

Since the light source generator 14 has a slot 25 for polarizing the light irradiated on the lens and the sampling transport pipe 10, the measurer has a surface perpendicular to the axis of the sampling transport pipe 10. It is possible to accurately observe the behavior of the particle sample flowing through the pipe direct type particle counter 11 by irradiating light from the light source generator 14 forming the surface.

In addition, since the sampling transport pipe 10 has a circular or rectangular cross section, the measurer can easily install the light source generator 14 and the photometer 15 and the like, and the particles flowing through the sampling transport pipe 10. The behavior of the sample can be observed accurately.

The arithmetic and signal processor 16 has a RS232 communication port or a remote transmission voltage according to the degree of scattered light measured by an optical measuring means including a photometer 15 including an A / D converter or a microprocessor. Correlation between particle size and number of particles representing the degree of scattering preprogrammed based on the magnitude of voltage measured by the photometer 15 as a configuration transmitted to a computer such as a microprocessor through a line or a separate transmission line. A built-in algorithm that can implement a relational expression calculates the particle loss amount (or loss rate) in the section of interest of the pipe by measuring to simultaneously quantify the particle sample flowing inside the pipe at the corresponding measurement position upstream and downstream of the sample transfer pipe 10. do.

6 is modularized into a single package of a pipe-type particle counter 11, a light source 14, and a photometer 15, and one or more required installation positions (A) (D) of the sample transfer pipe 10; It is a figure which shows that it is installed in arbitrary arbitrary installation target positions (B) (C) etc. of dog.

6, in the present invention, the pipe-directed particle counter 11, the light source 14, and the photometer 15 are modularized into a single package, and an essential installation position (A) (D) of the sample transfer pipe 10 is provided. ) Or upstream and downstream of the sample transfer pipe (10) because it is installed in the required installation position (A) and at least one optional installation position (B) (C) of the sample transfer pipe (10). It is possible not only to measure the behavior of the sample particles at the same time at the same time, but also to measure the behavior of the sample particles in various places as necessary, and to compare the values by passing the particles during the specific section of the sampling transport pipe 10. The amount of sample loss in the pipe due to deposition can be estimated.

In particular, the present invention is a departure from the conventional method of measuring the particle behavior with a time difference independently in the sampling transport pipe of the individual places, it is possible to significantly reduce the measurement time because the particle behavior can be measured at several places at the same time.

Here, the mandatory installation position for installing the pipe-connected particle counter 11, the light source 14, the photometer 15, or the modules 11, 14 and 15, which are modularized into individual packages In (A) and (D), it is preferable to select a specific position of the sampling transport pipe 10 closest to the duct in order to minimize the influence of the particle sample during the sampling transport pipe 10.

As described above, the present invention uses a radioactive waste facility and an isotope as an in-line loss rate measuring device installed at an air outlet of a facility where airborne pollutants are expected to be discharged to the atmosphere through an air outlet. In the field of radiation monitoring system of nuclear facilities such as facilities and nuclear power plants, particle emission monitoring systems of incinerators, steel mills, chemical plants and thermal power plants, etc. Can be used.

Although the present invention has been shown and described with reference to the preferred embodiments as described above, it is not limited to the above embodiments and those skilled in the art without departing from the spirit of the present invention. As a result, various modifications and variations are possible within the scope of the technical spirit of the present invention and the appended claims.

1: duct 2: shroud nozzle
3: Analyzer 10: Sampling Transfer Pipe
11: pipe direct type particle counter 12: upstream
13: Downstream 14: Light source generator
15 photometer 16 operation and signal processing unit
17, 20: inner circumference 18, 19:
21 fitting 22 outer peripheral surface
23, 24: flange 25: slot
26: display unit

Claims (10)

An in-line pipe-type particle counter 11 that is directly connected to an upstream 12 and a downstream 13 of a sampling transport tube 10;
A light source generator 14 installed outside the pipe direct type particle counter 11 to irradiate light perpendicular to the axial direction of the sample transfer pipe 10;
It is installed orthogonal to the same cross section as the light source generating unit 14 and is installed outside the pipe directing particle counter 11 perpendicularly to the axial direction of the pipe directing particle counter 11 and the light source generating unit 14. Photometer (15) for measuring the scattering degree of the light generated by the sample particles passing through the sampling transport pipe 10 by the light generated in the; And
The number of particle samples flowing inside the sampling transport pipe 10 from the correlation between the magnitude of the voltage and the number of particles representing the degree of scattering preprogrammed based on the magnitude of the voltage measured by the photometer 15. Operation and signal processing unit (16)
Apparatus for measuring the amount of loss due to particle deposition in the sampling transport pipe comprising a. The method of claim 1,
Apparatus for measuring the amount of loss due to particle deposition in the sample transport pipe, characterized in that the pipe direct particle counter (11) is transparent and the inner surface has a very low roughness (Quartz) or glass. The method of claim 1,
The pipe-type particle counter 11 is fitted within the sampling transport pipe, characterized in that it is connected to the upstream 12 and downstream 13 of the sampling transport pipe 10. Apparatus for measuring loss amount by particle deposition. The method of claim 1,
The pipe-type particle counter 11 has a flange connected to an upstream 13 and a downstream 13 of the sampling transport pipe 10 in a sampling transport pipe. Apparatus for measuring loss amount by particle deposition. The method of claim 1,
Apparatus for measuring the amount of loss by particle deposition in the sampling transport pipe, characterized in that the sampling transport pipe (10) and the pipe direct-type particle counter (11) has the same inner diameter. The method of claim 1,
The pipe direct particle counter 11 has a window for visually observing the particle sample in the pipe direct particle counter 11 is a device for measuring the amount of loss due to particle deposition in the sample transport pipe. . The method of claim 1,
The light source generator 14 is a laser generator for generating a laser or an apparatus for measuring the amount of loss by particle deposition in the sampling transport pipe, characterized in that the LED. The method of claim 1,
The light source generating unit 14 is characterized in that it comprises a lens that can diffuse and collect the light irradiated to the sampling transport pipe 10, and the slot 25 is intentionally processed to pass the light. A device for measuring the amount of loss due to particle deposition in a sampling pipe. The method of claim 1,
The sampling transport pipe (10) is a device for measuring the amount of loss by sedimentation in the sampling transport pipe, characterized in that the cross section is made of a circular or rectangular shape. The method of claim 1,
The pipe direct-type particle counter 11, the light source 14 and the photometer 15 are modularized into a single package, and at the same time in the required installation position (A) (D) of the sample transfer pipe (10). Installed at the same time or at least one arbitrary installation target location (B) (C) in addition to the required installation location (A) (D) of the sample transfer pipe (10) at the same time to count the particle sample flowing through the pipe Apparatus for measuring the amount of loss due to particle deposition in the sampling transport pipe, characterized in that for measuring.

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