JPH0655026A - Treatment of powdery waste and its device - Google Patents

Abstract

PURPOSE:To prevent the splashing of powdery waste, such as dust, into the atm. and to make contribution to a remedy for hazards, such as air pollution, by efficiently and smoothly feeding a gaseous mixture contg. the powdery waste into water and attaining the state that the powdery waste fed into the water is surely incorporated into the water. CONSTITUTION:The front end 23 of a duct 2 for introducing the gaseous mixture is submerged in the water W of a water tank 1. This duct 2 is internally provided with water spraying nozzles 3 for injecting water flow 34 toward the water surface W1 in the water tank 1. A net body 5 is disposed in the water around the duct 2 in order to form the finer bubbles of the gaseous mixture withdrawn into the water by the effect of the water flow injected from the water spraying nozzles 3. Further, an internal passage 62 of an air flow leading out pipe 6 rising from the air phase part Al of the water tank 1 is provided with water spraying nozzles 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention draws a mixed gas containing powdered waste such as dust into water, and captures only the powdered waste from the mixed gas in water to separate it from the gas. The present invention relates to a method for treating powdery waste and a device therefor.

[0002]

2. Description of the Related Art As is well known, pulverized waste such as dust (including soot and soot; hereinafter the same) is used for crushing and grinding raw sand at a crushed sand manufacturing site for concrete and other processes. It occurs in various production processes in various fields. And
These powdery wastes cause air pollution and eventually pollution, and must not be released into the atmosphere.

Therefore, the powdery wastes generated in various production processes are collected by some means before they are scattered in the atmosphere, and the collected large volume powdery wastes are not harmful. It is necessary to process it in such a state. As a method to do this, conventionally, powdery waste once scattered and dropped inside factories etc. is collected by a vacuum cleaner etc., packed in bags etc. and transported to the processing site for disposal. Was being done.

[0004]

By the way, since the powdery waste is easily scattered under the influence of ventilation, the collection work thereof is not only extremely difficult but also during transportation. May also scatter into the atmosphere due to the rupture of a bag or the like, and it is extremely troublesome and complicated to treat the powdery waste at a treatment site in a state where it does not cause any harm.

In recent years, there has been an attempt to treat powdery wastes by effectively using water, and the inventors of the present invention have followed this by using a duct to mix a mixed gas containing powdery wastes with a duct. We have proposed that only powdery waste remains in water until it is pumped into water and the mixed gas floats above the water surface. However, even if such a treatment using water is attempted, if the mixed gas pumped from the duct becomes bubbles in water, a phenomenon that powder waste is trapped in the bubbles Occurs.
And the powdered waste trapped in the bubbles is
In water, it is not separated from the air, which causes the inconvenience that air bubbles fly into the air when they bounce off the surface of the water.

In view of the above problems, the present invention is based on the concept of sending powdery wastes guided by a duct into water and capturing the powdery wastes in water, and efficiently mixing a mixed gas. It is a technical object to provide a treatment method and apparatus capable of drawing in water and leaving almost all powdery wastes in a mixed gas in water.

[0007]

In order to achieve the above-mentioned technical object, a method for treating powdery waste and an apparatus therefor according to the present invention are characterized in that they are constructed as follows.

That is, in the treatment method according to the invention of claim 1, the mixed gas in which the powdery waste is mixed is introduced onto the water surface, and the water is jetted into the water from the water surface in the vicinity of the introduction position. , The mixed gas is drawn into the water as bubbles along the flow of the water flow generated in the water, and the bubbles of the drawn mixed gas are subdivided in the water, so that the powdery waste in the bubbles is It is intended to be captured by.

Further, the processing apparatus according to the invention of claim 2 is
A water tank for storing water, a mixed gas introduction duct in which a tip having an outlet for mixed gas mixed with powdered waste is immersed in water in the water tank, and a water tank installed in this mixed gas introduction duct And a water injection nozzle for injecting water into the water from above.

Further, the processing apparatus according to the invention of claim 3 is
It is provided with a water tank for storing water, a mixed gas drawing means for drawing mixed gas mixed with powdery waste as bubbles into water, and a mesh body for subdividing the drawn mixed gas bubbles in water. .

Furthermore, the treatment apparatus according to a fourth aspect of the present invention is the treatment apparatus according to the second or third aspect, wherein the inlet is opened in the gas phase portion of the water tank and the airflow outlet pipe extends upward. And a water spray nozzle for spraying water into the internal passage of the airflow outlet pipe.

[0012]

According to the invention of claim 1, attention is paid to the phenomenon that the water flow injected into the water from above the water surface draws air near the water surface into the water as bubbles. In other words, the mixed gas mixed with powdery waste is guided to the water surface,
When water is injected near the water surface, the mixed gas is drawn into the water as bubbles, which further causes the mixed gas layer to have a pressure drop (that is, a negative pressure) in the zone near the water surface. ), The mixed gas around the negative pressure zone is drawn into the water through the negative pressure zone. In this case, if the mixed gas near the water surface is in an appropriate positive pressure state, the pushing action into the water by the positive pressure and the pulling action due to the generation of the negative pressure zone near the water surface are synergistically and more efficiently. The mixed gas is sent into the water as bubbles. Then, the bubbles of the mixed gas sent in are in a state in which the powdery waste is confined inside the bubbles, but the bubbles are subdivided in water, that is, the bubbles are crushed to cause a crushing phenomenon. As a result, the powdery waste enters the water and is captured. This is also due to the fact that the surface area of the entire bubbles becomes larger due to the subdivision of the bubbles, and the contact between the powdery waste inside and the water becomes more active than at the beginning. is there. As a result, almost all of the powdery waste remains in the water, and the powdery waste does not float in the atmosphere.

The invention of claim 2 is an apparatus used for carrying out the step of drawing the mixed gas into the water in the method of the above-mentioned claim 1, wherein the apparatus is used in the water stored in the water tank. The mixed gas is introduced into the water as bubbles by introducing the mixed gas onto the surface of the water through the duct into which the tip portion is introduced and injecting the water flow into the water from the water injection nozzle provided in the duct.

A third aspect of the present invention is a specific configuration of an apparatus for performing the step of subdividing air bubbles in water in the method of the first aspect, wherein the air bubbles drawn into the water by the mixed gas drawing means. Is crushed by passing through the mesh of the reticulate body, whereby the powdery waste is trapped and remains in the water.

According to the fourth aspect of the present invention, even if a very small amount of powdery waste not trapped in the water in the water tank comes out to the gas phase portion of the water tank, the powdery waste is discharged into the air flow outlet pipe. While rising in the internal passage of, it will adhere to the water sprayed from one or more water spray nozzles and fall into the water, and the perfectly cleaned air will be released to the atmosphere. become.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view showing the overall construction of a powdery waste processing apparatus according to the present invention. In the figure, 1 is a water tank storing water W, and 2 is a duct for introducing a mixed gas. The duct 2 includes a flexible extension portion 21 extended from a dust collector or the like, and a header portion 2 connected to the extension portion 21.
2 and the tip portion of the header portion 22, that is, the tip portion 23 of the duct 2 is immersed in the water W in the water tank 1. The tip portion 23 of the duct 2 has a mixed gas outlet 24.
As shown clearly in FIGS. 3 and 4, the edge of the tip end portion 23 is formed in an uneven shape having a large number of inverted V-shaped cuts 25 as a whole. Then, in this embodiment, the powdery wastes collected by the dust collector or the like are pumped to the duct 2 by the discharge pressure of the dust collector or the like.

In the header portion 22, that is, in the duct 2 at a plurality of locations (three locations at equal angles in the embodiment as shown in FIG. 2), a plurality of water jet nozzles 3 ...
Nozzle port 3 of these water jet nozzles 3 ...
31 are opposed to the water surface W1 above the water surface W1. A water supply pipe 32 led out from the bottom of the water tank 1 is connected to the water injection nozzles 3 ... A water supply pump 33 is interposed in the water supply pipe 32.

In the above structure, the powdery waste collected by a dust collector or the like, which will be described later, is pressure-fed into the duct 2 as indicated by the arrow F, so that the header portion 22 forming the duct 2 is discharged. Inside, the pushing action of the mixed air with respect to the water W in the water tank 1 is obtained. Then, by operating the water supply pump 33, the water W in the water tank 1 is pressure-fed and circulated through the water supply pipe 32 to the water injection nozzles 3 ... 3, and as shown in FIGS. In the interior, water streams 34 ... 34 indicated by arrows are jetted from the nozzle openings 31 ... 31 of the water jet nozzles 3 ... 3 toward the water surface W1, and the water streams 34 ...
Plunges into the water W. Since the water flows 34 ... 34 draw the mixed air near the water surface W1 into the water, the air layer A has a negative pressure due to a pressure drop in a zone near the water surface W1 and air around the negative pressure zone. The powdery waste is drawn into the water W through the negative pressure zone. This allows
The action of drawing the mixed air with respect to the water W in the water tank 1 is obtained. Therefore, the pushing action and the pulling action described above synergize to efficiently feed the mixed air into the water.

As shown in FIG. 4, the mixed air F changes into bubbles in the water W of the header portion 22 forming the duct 2. Then, the powdery waste is trapped in the bubbles, and the bubbles trapping the powdery waste are discharged from the mixed air outlet 24. In this way, when bubbles are discharged from the outlet 24, the bubbles are
Since the bubbles pass through the inverted V-shaped notch 25 around 4, the bubbles are more likely to come out from the outlet 24, and there is not only an advantage that the pumping capacity of the mixed air F does not need to be so large. There is the advantage that the powdery waste, which has been shredded into small pieces as it passes through the kerf 25, is then trapped in the air bubbles and released into the water. Further, the powdery waste that has not been trapped in the bubbles at this point is trapped in the water.

Next, as shown in FIGS. 1 and 4, the position around the tip 23 of the duct 2 immersed in the water is not lower than the outlet 24 in the water, that is, at the same height position, or The reticulated body 5 is arranged in the upper layer. In this case, the mesh 5 may be arranged so as to also cover the outlet 24 of the duct 2. Further, a baffle plate 26 is suspended and fixed to the lower right end portion of the tip end portion 23 of the duct 2, and the action of the baffle plate 26 prevents bubbles from flowing into the right side in the water tank 1 and floating. It is supposed to be done.

With such a structure, the air bubbles discharged from the outlet 24 of the duct 2, that is, the air bubbles enclosing the powdery waste, pass through the mesh of the mesh body 5 when floating in the water. Then, the bubbles are crushed when passing through the mesh of the reticulate body 5, and the crushing action releases the powdery waste into the water, whereby the powdery waste trapped inside the bubbles is mixed into the water. And then captured.

The above-mentioned crushing action of the mesh body 5 is caused by the mesh body 5.
Is likely to occur when the size of the mesh is smaller than the bubbles that pass through it. According to the result of the experiment, it was confirmed that the mesh of the mesh body 5 exhibits a good foaming action when the mesh is a square mesh whose one side is shorter than 0.6 mm. In this experiment, the length of one side of the square mesh of the mesh body 5 arranged in the range close to the tip portion 23 of the duct 2 (indicated by the symbol L in FIG. 1) is 0.075 mm, and the mesh bodies arranged around the square mesh. The length of one side of the square mesh of No. 5 was 0.6 mm. Further, according to the same experiment, the flow velocity of the mixed gas F and / or the water injection nozzle 3
It was possible to confirm that the bubbles discharged from the outlet 24 floated after reaching the location away from the tip portion 23 of the duct 2 as the water flow velocity from the. Therefore, when these flow velocities are changed, the arrangement state of the mesh body 5 may be different from that shown in the drawing. However, if the water tank 1 is to be used effectively as a whole, as shown in the drawing, the water tank 1 In order to satisfactorily subdivide the air bubbles that float in the left side portion, it is preferable that the net-like body 5 arranged in the left side portion be inclined upward to the right.

Further, in the treatment apparatus of FIG. 1, the water tank 1
In addition to the lid 11 being provided so as to secure the gas phase portion A1, the air flow outlet pipe 6 having the inlet 61 opened and extending upward in the gas phase portion A1, and the air flow. A water spray nozzle 7 for spraying water is provided in the internal passage 62 of the outlet pipe 6. This water injection nozzle 7
Although it is possible to use only one line, if a plurality of lines (three lines in the illustrated example) are used as shown in the figure, a great effect can be obtained.

With such a structure, the water W in the water tank 1 is
A small amount of powdery waste that was not trapped in the gas and came out to the gas phase portion A1 adhered to the water sprayed from the water spray nozzles 7 ... 7 while rising in the internal passage 62 of the airflow outlet pipe 6. The water drops in the state and is captured by the water W in the water tank 1. Therefore, the air exhausted from the airflow outlet pipe 6 is clean air containing no powdery waste.

The water discharged and dropped from the water spray nozzle 7 has a function of diluting the water W in the water tank 1, and in addition to this, the water flow 34 from the water injection nozzle 3 also causes the water tank. Since water is always supplied into the water tank 1, the water outlet 1x for adjusting the liquid surface is formed on the right end wall of the water tank 1 so that the height of the water surface W1 in the water tank 1 is always kept constant. There is. Therefore, in the water in the water tank 1, the pressure acting on the bubbles is always constant, so that the bubble breaking action or the like on the bubbles is uniformly performed, and the dust treatment is not hindered.

In this embodiment, the header portion 22 of the duct 2 has a triangular shape in plan view as shown in FIG. 2, but the header portion 22 has a round shape, a square shape, or a polygonal shape other than a square shape. Good. Further, although the duct 2 is formed of the extension portion 21 and the header portion 22 in the embodiment,
The duct 2 may be formed of a tube having the same thickness over the entire length. Further, although the duct 2 is in the inclined posture in the embodiment, the duct 2 may be in the vertical posture.

By the way, as a source of generation of the powdery waste treated by the above treatment apparatus, there is a medium stone (ball stone) production apparatus used for production of crushed sand for concrete. This manufacturing equipment 5
As for 0, as shown in FIGS. 5 and 6, the inside is the stirring chamber 51a.
The cylindrical drum 51 can be rotatably driven by the force of a motor (not shown), and an opening 52 that serves as an inlet and an outlet is provided on one end wall 51x of the drum 51, and the opening 52 has a spiral shape. A blade 53 is attached to improve stirring efficiency, and a dust collector 55 is connected in series through an opening 54 formed in the other end wall 51y of the drum 51. According to such a configuration, the dust 5 generated when the cylindrical drum 51 is rotated to crush or grind the medium stones 56 ... 56 in the stirring chamber 51a.
57 are collected by the dust collector 55 connected to the other end wall 51y of the drum 51, pass through the silo 58, and are efficiently processed by the processing device described in the embodiment.

[0028]

According to the method for treating powdery waste of the first aspect of the present invention, the water is directed from the surface of the water into the water while the mixed gas containing the powdery waste is introduced onto the surface of the water. The mixed gas is sent into the water as bubbles due to the entrainment action due to the generation of the negative pressure zone near the water surface, and when the bubbles are subdivided, the powdery waste inside the bubbles is submerged in the water. Since it enters and remains, the mixed gas can be smoothly and satisfactorily sent into the water, and further, the powdery waste in the mixed gas is efficiently mixed into the water. . As a result, scattering of the powdery waste into the atmosphere is prevented, and harmful effects such as air pollution are effectively avoided.

According to the powdery waste treatment apparatus of the second aspect of the present invention, the mixed gas is introduced onto the water surface by the duct having the tip end inserted into the water stored in the water tank. At the same time, the water jet is provided in the duct to inject a water flow into the water, so that the mixed gas is drawn into the water as bubbles, so that the mixed gas is efficiently drawn into the water. Therefore, it is possible to suitably treat the powdery waste with water.

According to the powdery waste treatment device of the third aspect, even if the powdery waste is trapped inside the bubbles sent into the water by the mixed gas drawing means, the bubbles are reticulated. The powdery waste is released into the water and captured by the foaming action that occurs when passing through the mesh of the body, and becomes a state of being mixed in the water. For this reason, there is an advantage that it is possible to prevent the occurrence of a situation in which the bubbles pop off on the water surface while trapping the powdery waste and release the powdery waste into the atmosphere.

According to the powdery waste treatment device of the fourth aspect of the present invention, the powdery waste that has not been captured in the water in the water tank and has flowed out to the gas phase portion rises in the airflow outlet pipe. During that time, it adheres to the water sprayed from the water spray nozzle and falls into the water in the water tank, so that there is an advantage that the efficiency of capturing the powdery waste sent into the water is significantly improved.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional front view showing an overall configuration of an embodiment of a powdery waste treatment device according to the present invention.

FIG. 2 is a perspective view showing appearances of a mixed gas introduction duct and a water injection nozzle in the above embodiment.

FIG. 3 is a perspective view showing an arrangement state of a mixed gas introduction duct, a water jet nozzle, and a mesh body in the above embodiment.

FIG. 4 is a vertical sectional front view of an essential part showing the operation of the embodiment.

FIG. 5 is a front view showing an example of an apparatus for delivering powdery waste to the mixed gas introduction duct of the above embodiment.

FIG. 6 is a vertical cross-sectional front view of a main part showing an example of an apparatus for delivering powdery waste to a mixed gas introduction duct of the above embodiment.

[Explanation of symbols]

 W water W1 water surface A1 gas phase part 1 water tank 2 mixed gas introduction duct 3 water injection nozzle 5 mesh 6 airflow outlet pipe 7 water spray nozzle 23 tip of duct 24 dust outlet 62 internal passage of airflow outlet pipe

Claims (4)

[Claims] 1. A mixed gas mixed with powdery waste is introduced onto the water surface, and water is jetted into the water from the water surface in the vicinity of the introduction location, whereby the flow of water flow generated in the water is changed. Along with this, the mixed gas is drawn into the water as bubbles, and the bubbles of the drawn mixed gas are subdivided in water, so that the powdery waste in the bubbles is trapped in the water. How to dispose of powdery waste. 2. A water tank for storing water, a mixed gas introduction duct in which a tip portion having an outlet for the mixed gas mixed with powdery waste is immersed in water in the water tank, and the inside of this mixed gas introduction duct. And a water injection nozzle for injecting water into the water from above the water surface in the water tank. 3. A water tank for storing water, a mixed gas drawing means for drawing mixed gas containing powdery waste as bubbles into water, and a mesh body for subdividing the drawn mixed gas bubbles in water. An apparatus for treating powdery waste characterized by being provided. 4. An airflow outlet pipe having an inlet opening and extending upward in a vapor phase portion of the water tank, and a water spray nozzle for spraying water into an internal passage of the airflow outlet pipe. The apparatus for treating powdery waste according to claim 2 or 3, wherein.