JPH04136551U - Continuous scattered dust measurement device - Google Patents

Abstract

(57) [Summary] [Purpose] To continuously and automatically measure the concentration of airborne dust in the atmosphere using a simple device that does not use consumable parts. [Structure] A suction pipe 1 opened in the horizontal direction, a cyclone 2 connected to this, a light intensity type dust concentration measuring device 3 connected to this, an anemometer 4, and suction based on the measurement results of this anemometer. a suction pump 6 that adjusts the suction pressure of the pipe;
The main body of the device including the wind vane 5 is mounted on a pedestal 8 which is rotatable around a vertical axis of rotation.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is intended to monitor air pollution, etc. by dispersing and floating on the wind around dust sources. This invention relates to a device that continuously measures the concentration of floating dust.

0002

[Conventional technology]

Measuring the concentration of suspended dust in the atmosphere is one of the main items in monitoring air pollution, along with analyzing gases such as NO _x and SO _x . Measuring the amount of dustfall that naturally settles on a collector is the simplest method, but it requires measurement at regular intervals, so it is not suitable for continuous monitoring over a wide area. Therefore, in recent years, a method using an adhesive tape as shown in Japanese Utility Model Publication No. 59-20660, for example, has been developed as a method for continuous automatic measurement using equipment.

0003 Figure 4 shows an embodiment of the device shown in this publication, which rotates to follow the wind direction. The main body of the device placed on the stand 51 consists of an upper storage case 54, an exposed part 56 in the middle, and a lower box. The transparent tape 55 inside the storage case 54 is pulled out and the adhesive on one side is The light passes through the exposed part 56 with the landing surface facing upwind, and is emitted before being wound up by the lower case 54. It is configured to pass between the receiver 58 and the light receiver 59. In the atmosphere while passing through exposed section 56 Dust adheres to the adhesive surface of the transparent tape 55, and depending on the amount of dust, the light of the transparent tape As the transmittance changes, this is extracted as an electrical signal, sent to the indicator 60, and recorded. A total of 61 can be recorded.

0004 In this example, changes in light transmittance are measured, but a similar measurement method using light intensity is used. There are also known methods that measure the scattering of light. Also, β-rays are used instead of light. There are also methods that use laser beams, as disclosed in Japanese Utility Model Application Publication No. 60-76255.

[0005]

[Problem that the idea aims to solve]

By the way, by controlling the feeding speed of the adhesive tape, such a device can Continuous and automatic measurement over a desired period is possible, but there is no need to replace the tape or feed the tape. In addition to requiring mechanical maintenance, dust particles of all sizes can be used regardless of particle size. Therefore, it is not possible to measure only the specific scattered dust that is the target of monitoring. Additionally, when it rains, water droplets adhere to the tape, making measurements biased towards higher concentrations. There are also points.

[0006] The present invention provides a continuous automatic measurement device for scattered dust that eliminates these problems. There are many things.

[0007]

[Means to solve the problem]

This invention is a device for measuring the concentration of airborne dust, and the main body of the device is horizontally oriented. A suction pipe opened in the direction, a cyclone connected to this, and a light connected to this. A quantitative dust concentration measuring device, an anemometer, and a suction pipe based on the measurement results of this anemometer. It consists of a suction pump that adjusts the suction pressure and a wind vane, and the main body of the device rotates vertically. It is characterized by being mounted on a pedestal that is rotatable around its axis.

[0008]

[Effect]

According to this invention, maintenance is easy because no consumable parts such as transparent tape are used. By using a cyclone, only dust with a specific particle size can be selected and concentrated. In addition, it can be linked with a wind vane or anemometer to always face the direction of the wind and perform uniform suction. , it is possible to perform accurate automatic measurements continuously, and the manufacturing cost of the device is low overall. It is.

[0009]

【Example】

An embodiment of the device of the present invention is shown in FIG. 1 is suction tube, 2 is cyclone, 3 is da 4 is an anemometer, 5 is a wind vane, 6 is a suction pump, 7 is a calculation unit, 8 is a It is a pedestal. The main body of the device is mounted on a pedestal 8 that is rotatable around a vertical rotation axis. , an arrow-shaped wind vane 5 is used to follow the direction of the wind, and the head of the device is opened horizontally. The opened suction tube 1 always faces in the opposite direction. Rain is applied to suction pipe 1 as necessary. Raindrops will not get in as there is a canopy and the opening is oriented horizontally. measurement The normal atmosphere should contain the same concentration of dust as the surrounding area of the equipment. Since it is necessary to perform so-called uniform suction, the finger of the anemometer 4 attached to the main body of the device According to the instructions, operate the suction pump 6 at the bottom of the device body, adjust the suction pressure, and remove the suction pipe. From 1, the air is sucked in at a speed equal to the surrounding wind speed. Anemometer is propeller type, hot wire type Either is fine. The suction pipe 1 is connected to the cyclone 2, which collects certain scattered powder. It selectively collects and measures dust particles in the range of, for example, 200μm to 10μm. Concentrate to a concentration that is easily determined. The dust concentration measuring section through which the airflow passes after concentration is non-contact. It may be a contact type, and may be a light scattering type, a light transmission type, or the like.

0010 Figure 2 shows the measurement items and processing flow in this example, and the measurement results are shown as appropriate. You can give instructions to the indicator and record it to the recorder.

[0011]

[Effect of the idea]

According to the present invention, consumables such as transparent adhesive tape and its feeding mechanism can be eliminated. This reduces maintenance costs and manpower, and It is possible to selectively measure only dust particles of a specific particle size and eliminate the influence of raindrops. Always get accurate measurements.

0012 Figure 3 is the same as the conventional β-ray-transparent tape method, with the dust concentration index plotted on the horizontal axis. Measure the dust concentration index using the device of this invention at the same location and time on the vertical axis The values are plotted, but the points are distributed around a 45° straight line, and both It can be seen that most people are in agreement.

[Brief explanation of drawings]

FIG. 1 is a side view showing the configuration of an embodiment of the present invention.

FIG. 2 is a processing flow diagram of measured values in an embodiment of the present invention.

FIG. 3 is a graph showing a comparison between an embodiment of the present invention and a conventional example.

FIG. 4 is a side view showing the configuration of a conventional technique.

[Explanation of symbols]

1 Suction tube 2 Cyclone 3 Dust concentration measurement section 4 Anemometer 5 Wind vane 6 Suction pump

Claims (1)

[Scope of utility model registration request] Claim 1: A device for measuring the concentration of scattered dust in the atmosphere, the main body of the device comprising a suction pipe opened in the horizontal direction, a cyclone connected to the suction pipe, and a light intensity type dust concentration measuring device connected to the suction pipe. The device consists of an anemometer, a suction pump that adjusts the suction pressure of the suction pipe based on the measurement results of the anemometer, and an anemometer. A continuous dust measuring device characterized by: