JPH04298211A - Scrubber - Google Patents

Abstract

PURPOSE:To simplify the entire part of equipment by a decrease in pressure drop and to reduce energy consumption as well as to obtain high dust removing efficiency. CONSTITUTION:A dust removing space Sp is provided between an inner cylindrical part 2 and an outer cylindrical part 3 by disposing the inner cylindrical part 2 and the outer cylindrical part 3 coaxially with a perpendicular axial line. The top end of the dust removing space Sp is closed. An exhaust gas introducing port 4 which can introduce the exhaust gas C in approximately the peripheral direction of the dust removing space Sp from the top end of the peripheral surface part 3f of the outer cylindrical part 3 is disposed to face this top end. The bottom end of the dust removing space Sp and the bottom end of the inside cylindrical part 2 are communicated with each other. A liquid discharge part 6 having a liquid accumulating part 8 for storing the prescribed volume of waste water (waste liquid) Wt is provided in the lower part of the outer cylindrical part 3 and plural injection nozzles 7... which inject a dust removing liquid, for example, water, in a mist form in the flow direction of the exhaust gas C are disposed in the dust removing space Sp.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scrubber for removing harmful components, dust, etc. from exhaust gas discharged from factories and the like.

0002

2. Description of the Related Art Generally, exhaust gas discharged from factories and the like often contains harmful components and dust, so scrubbers are used to remove these.

Conventionally, various types of scrubbers have been put into practical use, but the Venturi scrubber is known as the scrubber with the highest performance. FIG. 6 shows the basic configuration of a conventional venturi scrubber. The venturi scrubber 60 shown in the same figure has an exhaust gas 62 in a venturi pipe 61 which is constricted.
The electrostatic dust removal device is used to increase the flow rate by passing through the liquid and inject a mist chemical liquid (neutralizing liquid, etc.) 63 into the liquid to bring the liquid into gaseous contact and remove harmful components and dust. You can obtain a dust removal effect close to that of Note that the gas 64 from which harmful components and the like have been removed is discharged to the outside from the exhaust pipe 65.

0004

[Problems to be Solved by the Invention] However, although the conventional venturi scrubber 60 described above can obtain relatively high dust removal efficiency, it requires the use of a venturi pipe 61, resulting in high pressure loss and problems with the air supply system. The equipment was large and large-scale, and energy consumption was high, and there was also a limit to how much dust removal efficiency could be achieved.

[0005] The present invention solves the problems that exist in the conventional technology, and aims to provide a scrubber that simplifies the entire equipment, reduces energy consumption, and achieves high dust removal efficiency. do.

[0006]

[Means for Solving the Problems] The scrubber 1 according to the present invention has an inner cylinder part 2 and an outer cylinder part 3 disposed coaxially with respect to a vertical axis, so that the inner cylinder part 2 and the outer cylinder part 3 are disposed coaxially. Dust removal space Sp
is provided, closes the upper end of the dust removal space Sp, and faces the exhaust gas inlet 4 through which exhaust gas C can be introduced from the upper end of the peripheral surface 3f of the outer cylinder part 3 in a substantially circumferential direction of the dust removal space Sp. and the lower end of the inner cylinder part 2 are connected to each other,
In addition, a liquid drain part 6 having a liquid reservoir part 8 for storing a predetermined amount of waste water (drainage liquid) Wt is provided in the lower part of the outer cylinder part 3, and a dust removal liquid, a dust removal liquid, For example, it is characterized by disposing a plurality of injection nozzles 7 that eject water W in the form of mist. In this case, the injection nozzles 7...
Place it in f.

[0007]

[Operation] According to the scrubber 1 according to the present invention, the inner cylinder part 2
A cylindrical dust removal space Sp is formed by the outer cylinder portion 3 and the outer cylinder portion 3. Therefore, if the exhaust gas C is introduced in a substantially circumferential direction from the exhaust gas inlet 4 facing the dust removal space Sp, the exhaust gas C flows in a spiral shape inside the dust removal space Sp and reaches the lower end. As a result, the flow length of the exhaust gas C becomes substantially longer.

On the other hand, inside the dust removal space Sp, atomized water W is ejected from the injection nozzles 7 in the flow direction of the exhaust gas C, so the exhaust gas C comes into contact with the atomized water W, and harmful substances are removed from the exhaust gas C. Components, dust, etc. are removed (cleaned). After the gas contact, the water W is stored in the liquid storage part 8 in the liquid drainage part 6, and is further discharged (stored) to the outside, and the gas Co from which harmful components have been removed is removed from the dust removal space Sp. The liquid enters the lower end of the inner cylinder part 2 from the lower end of the cylinder, ascends through the internal space of the inner cylinder part 2, and is discharged to the outside.

At this time, from the lower end of the dust removal space Sp to the inner cylinder part 2
A part of the gaseous Co that reaches the contact point with the liquid surface of the waste water Wt in the liquid reservoir 8, and further removal of harmful components and the like is performed. Note that if the injection nozzles 7 are arranged inside and outside the dust removal space Sp, the mist filling the dust removal space Sp can be made more uniform.

0010

Embodiments Next, preferred embodiments of the present invention will be described in detail with reference to the drawings.

First, the overall configuration of a scrubber system M including the scrubber 1 according to the present invention will be explained with reference to FIGS. 3 to 5.

Reference numeral 1 designates a scrubber according to the present invention, and one end of an introduction duct 11, that is, an exhaust gas introduction port 4 is provided at the upper end of the circumferential surface.
Connect. The other end of the introduction duct 11 serves as an inlet 12 for sucking exhaust gas C discharged from factories, etc., and a blower 13 is provided in the middle of the introduction duct 11.

On the other hand, an exhaust port 5 is provided at the center of the upper surface of the scrubber 1 to discharge gaseous Co from which harmful components have been removed, and one end of a drain pipe 14 is connected to the center of the lower surface. The other end of the drain pipe 14 is connected to one side of the septic tank 15 to form a drain section 6. In this case, the amount of water (water surface level) in the septic tank 15 can be adjusted as desired, thereby forming a liquid reservoir 8 that can store a predetermined amount of water W at the bottom of the scrubber 1. Further, one end of a water pipe 16 is connected to the other side of the septic tank 15, and the other side of the water pipe 16 is connected to the scrubber 1 via a pump 17. Note that the septic tank 15 has a function of storing and purifying the water W returned from the drain pipe 14, and a filter 18 shown in FIG. 5 is provided in the middle part inside the septic tank 15. Note that 19 is a cleaning port provided in the scrubber 1.

Next, the main structure of the scrubber 1 will be explained with reference to FIGS. 1 and 2.

The scrubber 1 includes an inner cylinder part 2 and an outer cylinder part 3 arranged coaxially with respect to a vertical axis. Thereby, a cylindrical dust removal space Sp is formed between the inner cylinder part 2 and the outer cylinder part 3. The upper end of the dust removal space Sp is closed by an upper surface part 3u integrally formed with the upper end of the outer cylinder part 3. Furthermore, the exhaust gas inlet 4 is connected to the upper end of the peripheral surface portion 3f of the outer cylinder portion 3. The exhaust gas inlet 4 faces the exhaust gas C so that it can be introduced into the dust removal space Sp in a substantially circumferential direction. On the other hand, the lower end of the inner cylinder part 2 is formed shorter than the length of the outer cylinder part 3, so that the lower end of the dust removal space Sp and the internal space of the inner cylinder part 2 are communicated with each other, and the upper end of the inner cylinder part 2 is formed at the exhaust port. 5, it is opened toward the outside and upward. Further, a lower surface portion 3d is integrally formed at the lower end of the outer cylinder portion 3, and the drain pipe 14 constituting the liquid drain portion 6 is connected to the center of the lower surface portion 3d.

On the other hand, an outer ring pipe 21 is disposed along the outer periphery of the circumferential surface portion 3f of the outer cylindrical portion 3, and an outer ring pipe 21 is disposed along the outer periphery of the circumferential surface portion 2f of the inner cylindrical portion 2. A water supply pipe 16 is connected to each outer ring pipe 21 and inner ring pipe 22. On the other hand, a plurality of (four in the example) outer vertical pipes 23 are provided on the upper surface of the outer ring pipe 21 at equal intervals along the ring direction, and the inner ring pipe 22
A plurality (four in the example) of inner vertical pipes 24 are provided at equal intervals along the ring direction on the upper surface of the ring, and each of the inner vertical pipes 23..., 24 stands up in the vertical direction. Further, a plurality of injection nozzles 7 are provided at regular intervals in the longitudinal direction of the inner vertical pipe 24. The injection nozzles 7 have a function of ejecting water W in the form of mist, and the ejection direction is set in the flow direction of the exhaust gas C, which is approximately the circumferential direction of the dust removal space Sp. Furthermore,
Also in the longitudinal direction of the outer vertical pipe 23, a plurality of injection nozzles 7 having the same function as the inner vertical pipe 24 are provided at regular intervals. In this case, the injection nozzle 7 of the outer vertical pipe 23...
penetrates the outer cylindrical portion 3 and faces inside. Further, the outer vertical pipes 23... and the inner vertical pipes 24... are arranged alternately in the circumferential direction of the dust removal space Sp as shown in FIG.
No. 4 injection nozzles 7 are arranged alternately in the vertical direction,
Consideration is given so that the mist from each injection nozzle 7 uniformly fills the dust removal space Sp. The inner ring pipe 22 is provided on the inner circumferential surface of the inner cylinder part 2 so as not to obstruct the flow of the exhaust gas C, and the injection nozzles 7 are inserted into the dust removal space S by penetrating the inner cylinder part 2.
You may also have them face p.

Next, the operation and function of the entire scrubber system M including the scrubber 1 will be explained.

First, exhaust gas C discharged from a factory or the like by the operation of the blower 13 is sucked in through the suction port 12 . Then, the exhaust gas C passes through the introduction duct 11 and the exhaust gas inlet 4
is introduced into the upper end of the dust removal space Sp. Since the exhaust gas C is introduced in the substantially circumferential direction of the cylindrical dust removal space Sp, it flows in the dust removal space Sp in a spiral shape as shown by the arrow H in FIGS. 1 and 2, and reaches the lower end. As a result, the flow length of the exhaust gas C becomes substantially longer. On the other hand, since atomized water W is ejected from each injection nozzle 7 in the flow direction of the exhaust gas C, the exhaust gas C comes into contact with the atomized water W in the dust removal space Sp. Components, dust, etc. are removed (cleaned). In this case, a chemical liquid such as a neutralizing liquid is usually used, but if the present scrubber 1 is used for exhaust gas with a relatively low concentration, a sufficient dust removal effect can be obtained even with water W. Then, the gas Co from which harmful components have been removed enters the internal space from the lower end of the dust removal space Sp and the lower end of the inner cylinder part 2, rises in the inner space of the inner cylinder part 2, and is discharged to the outside from the exhaust port 5. be done.

On the other hand, the waste water Wt containing harmful components etc. after the gas contact is stored in the liquid reservoir part 8 in the drain part 6, and further flows into the septic tank 15 through the drain pipe 14.
It is simply purified in the septic tank 15. That is, relatively large solids in the waste water Wt settle in the septic tank 15, and small solids are removed by the filter 18.

[0020] Since the liquid reservoir 8 exists below the outer cylinder part 3, the gas Co flows from the lower end of the dust removal space Sp to the inner cylinder part 2.
At the time of reaching this point, the water further comes into contact with the water surface of the waste water Wt accommodated in the liquid reservoir 8, and harmful components and the like are removed. The amount of water in this liquid reservoir 8 can be adjusted, and if the water level is raised by adjusting the water amount, the ventilation path will be narrowed, and if it is lowered, the ventilation path will be widened. (pressure loss) etc. can be finely adjusted. Further, the purified waste water Wt in the septic tank 15 is transferred to the water pipe 1 by the pump 17.
6 to the outer ring pipe 21 and inner ring pipe 22, and is ejected from the injection nozzles 7.

[0021] In such a scrubber 1, the pressure loss is extremely small, and since the flow path of the exhaust gas C is spiral-shaped, the substantial flow length can be increased, and the dust removal efficiency can be increased.

The embodiments have been described in detail above, but
The invention is not limited to such embodiments. For example, it is of course possible to use a chemical solution such as an acidic solution or an alkaline solution instead of water. Further, the injection nozzle may be located on either the inner cylinder side or the outer cylinder side. In addition, the detailed configuration, shape, quantity, etc. may be arbitrarily changed without departing from the gist of the present invention.

[0023]

As described above, the scrubber according to the present invention provides a dust removal space between the inner cylinder part and the outer cylinder part, closes the upper end of the dust removal space, and opens the dust removal space from the upper end of the peripheral surface of the outer cylinder part. An exhaust gas inlet that can introduce exhaust gas in a substantially circumferential direction faces the exhaust gas inlet, the lower end of the dust removal space and the lower end of the inner cylinder part are connected to each other, and a liquid reservoir part for storing a predetermined amount of waste liquid is provided at the lower part of the outer cylinder part. In addition to providing a drainage section with a liquid discharger, multiple injection nozzles are installed in the dust removal space to spray dust removal liquid in the form of a mist in the flow direction of the exhaust gas, eliminating the need for a conventional Venturi tube and reducing pressure. This has the remarkable effect of simplifying the entire equipment and lowering energy consumption due to a significant reduction in losses, as well as achieving high dust removal efficiency.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a scrubber according to the present invention;

[Figure 2]
Cross-sectional view of the same scrubber,

[Fig. 3] Front view of a scrubber system including the same scrubber,

[Fig. 4] Plan view of the scrubber system,

[Fig. 5] Cross-sectional side view of the water tank in the same scrubber system,

[Fig. 6] Principle configuration diagram of a venturi scrubber according to conventional technology,

[Explanation of symbols]

1 Scrubber 2 Inner cylinder part 2f Peripheral part 3 Outer cylinder part 3f Peripheral part 4 Exhaust gas inlet 6 Drainage part 7 Injection nozzle 8 Liquid reservoir Sp Dust removal space C Exhaust gas W Water Wt drainage

Claims (4)

[Claims] Claim 1: By arranging the inner cylinder part and the outer cylinder part coaxially with respect to the vertical axis, a dust removal space is provided between the inner cylinder part and the outer cylinder part, the upper end of the dust removal space is closed, and the outer cylinder part is arranged coaxially with respect to the vertical axis. An exhaust gas inlet that can introduce exhaust gas in the general circumferential direction of the dust removal space faces from the upper end of the peripheral surface of the cylinder part, and the lower end of the dust removal space and the lower end of the inner cylinder part are connected to each other, and at the bottom of the outer cylinder part, A liquid drainage part having a liquid reservoir capable of storing a predetermined amount of waste liquid is provided, and a plurality of spray nozzles are arranged in the dust removal space to spray dust removal liquid in the form of mist in the flow direction of the exhaust gas. A scrubber characterized by: 2. The scrubber according to claim 1, wherein water is used as the dust removal liquid. 3. The scrubber according to claim 1, wherein the injection nozzle is disposed on the circumferential surface of the inner cylindrical portion and/or on the circumferential surface of the outer cylindrical portion. 4. The scrubber according to claim 1, wherein the amount of waste liquid stored in the liquid reservoir is configured to be adjustable.