JPH0141214B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mist particle size distribution measuring device for exhaust gas.

In recent years, wet exhaust gas cleaning and dust collection devices have been widely used, and it has become necessary to measure the particle size distribution and concentration of dust and mist contained in these exhaust gases in order to evaluate the performance of the devices.

Conventionally, as a dust particle size distribution measuring device, an impactor type device using the principle of inertial collision is known. This measuring device ejects dust-containing exhaust gas from a nozzle, collides with a collision collection plate placed opposite the nozzle, and collects the dust on the plate. By gradually decreasing the diameter of the nozzle and the interval between the nozzles and the collection plates and providing them in multiple stages, it is possible to classify the dust to each collection plate and collect it for each particle size.
However, when collecting mist or dust containing mist with such a dust particle size distribution measuring device,
Due to the collection of mist, the liquid deposited on the collection plate flows down and cannot be collected, making it unusable.

The present invention solves this problem by providing a mist reservoir, thereby making it possible to classify and collect mist or dust containing mist. In other words, a suction system in which a number of mantle tubes are connected in a manner that they can be connected and separated, one end of the mantle tube is provided with an inlet for introducing the exhaust gas containing the mist to be classified and collected, and the other end of the mantle tube is provided with a suction port. The tubes are connected, and a connecting tube for insertion into the dust is connected, and a nozzle is fixed in each tube, and a mist collection plate is placed facing the nozzle, and the inner diameter of the nozzle and the nozzle are fixed. and the mist collecting plate, the distance between the mantle and the mist collecting plate is gradually reduced from the mantle at one end to the mantle at the other end, and a rising wall is provided on the mantle behind the mist collecting plate to form a mist reservoir. That is.

Embodiments of the present invention will be described in detail below with reference to the drawings.

The exhaust gas mist particle size distribution measuring device shown in the drawing is
The first sleeve 1 is constructed by connecting a number of sleeves 1, 2, 3, and 4 so as to be able to connect and separate, and is provided with an inlet 10 for introducing the exhaust gas containing the mist to be classified and collected. The second, third, and fourth cannula 2, 3, and 4 of the same structure are sequentially connected to this cannula 1, and the connecting tube 5 is connected to the cannula 4 at the rearmost end. A suction pipe 6 having a filter 7 sandwiched therebetween and a suction port 8 communicating with a suction pump is attached to the connecting pipe 5, and a connecting pipe 9 connected to the suction pump is further connected to the suction pipe. .

As a means for interconnecting the above-mentioned mantle tubes, connecting tubes, and suction tubes, the fitting portions of the two are airtightly joined by an O-ring 11, and the screw rod 13 rotatably attached to the tightening frame 12 is connected to the screw rod 13 of the other frame. Although the case is shown in which the wing nut 15 that engages with the wing nut 14 is screwed, any other arbitrary coupling means may be employed.

Each of the above-mentioned mantles has a nozzle 2 inside it.
1, 22, 23, 24, and mist collection plates 31, 3
2, 33, and 34 are fixed, and the spout 2 of the nozzle is
1a, 22a, 23a, and 24a, and the inner diameter of these nozzles is the same as that from the first cannula 1 provided with the mist introduction port 10 to the rearmost cannula 4 leading to the suction pipe 6. The spacing between the ejection ports 21a, 22a, 23a, 24a and the mist collection plates 31, 32, 33, 34 facing them is also gradually reduced.

Next, the mist reservoirs 51, 52, 53, 5 of each cannula
4 is formed by rising walls 41, 42, 43, 44 provided behind the mist collection plates 31, 32, 33, 34 and walls behind each nozzle, and the mist collided with and collected by the mist collection plates. The water flows down and collects at the bottom of the cannula.

In the exhaust gas mist particle size distribution analyzer having the above configuration, when suction is performed from the suction port 8 in the suction tube with the inlet 10 in the cannula 1 open to the exhaust gas containing mist, the nozzle 21 in the cannula 1 The gas is ejected toward the mist collection plate 31, and mist particles with a large inertial force, that is, mist particles with a large particle size, collide and are collected on the collection plate 31, and other mist particles are collected by the collection plate 31. The mist flows into the next-stage cannula 2 through the surroundings of the mist 31, and collection of the mist is repeated in the same manner. In this case, since the inner diameter of the nozzle's ejection port is gradually reduced and the distance between the ejection port and the collection plate is gradually reduced, mist of smaller particle size is collected as it goes to the later stages. As a result, the mist is classified and collected in the cannula of each stage.

The mist particles collided with and collected on the collection plate grow together with the following mist particles, and the droplets formed by this are swept away to the surrounding area by the airflow ejected from the nozzle. It does not flow downward from the periphery of the plate due to gravity, flow into the mist reservoir, and scatter.

After a required period of time, the droplets that have flowed into the mist reservoir are weighed by removing each mantle, thereby allowing the mist to be classified and measured according to particle size.

As is clear from the above detailed description, according to the present invention, by improving the dust collection device and providing a mist reservoir inside the sleeve, mist can be easily and accurately classified in exhaust gas. Collection can be performed and particle size distribution can be measured.
In addition, the present invention has a short gas introduction pipe and can be directly inserted into the exhaust gas using a connecting pipe, so it is possible to avoid the deposition of mist on the pipe line during gas introduction, which is different from conventional gas introduction. It has the advantage of being able to measure more accurately than those that require long pipes.

[Brief explanation of drawings]

The drawing is a sectional view showing the configuration of the exhaust gas mist particle size distribution measuring device according to the present invention. 1-4...Cannula, 6...Suction tube, 8...Suction port, 9...
Communication pipe, 10...Inlet, 21-24...Nozzle, 2
1a-24a... spout, 31-34... mist collection plate, 41-44... rising wall, 50-54... mist reservoir.

Claims (1)

[Claims] 1. A suction pipe in which a number of mantle tubes are connected so as to be separable, one end of the mantle is provided with an inlet for introducing the exhaust gas containing the mist to be classified and collected, and the other end of the mantle is provided with a suction port. and the communication pipes are connected, and a nozzle is fixed in each mantle tube, and a mist collection plate is placed opposite the nozzle, and the inner diameter of the nozzle and the distance between the nozzle and the mist collection plate are set as above. A mist particle size distribution measuring instrument for exhaust gas, characterized in that the size is gradually reduced from the cannula at one end to the cannula at the other end, and a rising wall is provided in the cannula behind the mist collection plate to constitute a mist reservoir.