JP2008296152A - Scrubber apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To develop a new scrubber apparatus increasing collection efficiency of tar or carbide and increasing an operation rate by avoiding clogging of a circulation line of cleaning liquid. <P>SOLUTION: The apparatus wherein treating object gas G is supplied to a treating space 50A formed in a casing 50 and the cleaning liquid L is supplied, and the treating object gas G is brought into contact with the cleaning liquid L to clean the gas G, has a mechanism spreading the cleaning liquid L in a film state to diffusively supply into the casing 50. The preferable contact state of the treating object gas G to the cleaning liquid L is obtained to increase the collection efficiency of tar or carbonized matter. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus for removing tar, carbide, etc. from pyrolysis gas, etc., and in particular to a scrubber apparatus capable of increasing the collection rate of tar, carbide, etc. and avoiding blocking of the circulation path of the cleaning liquid. It is concerned.

Conventionally, resin-based industrial waste, coal, and the like are gasified by a gasification furnace and effectively used as a heat source for a plant.
At this time, since pyrolysis gas generated in the gasification furnace contains dust such as tar and carbide, tar and dust are sprayed by spraying a cleaning liquid such as tar and light oil onto the pyrolysis gas using a scrubber. Is removed (see, for example, Patent Document 1).
In such a method, the cleaning liquid is circulated and used, but the nozzle for spraying the cleaning liquid is clogged with dust in a short time, so it is very troublesome for maintenance work such as removal of clogged dust. It was over.
Of course, it is possible to avoid clogging of the nozzle by providing a strainer in the front part of the nozzle, but since the strainer will eventually clog, it is necessary to perform maintenance work with the device stopped. There is no.

JP 56-106992 A

  The present invention has been made in view of such a background, and it is a novel technique capable of improving the operating rate by increasing the collection efficiency of tar, carbide, etc., and avoiding blocking of the circulation path of the cleaning liquid. The development of the scrubber device is a technical issue.

That is, the scrubber device according to claim 1 supplies the gas to be processed to the processing space formed in the housing, supplies the cleaning liquid, and cleans the gas to be processed by contacting the gas to be processed and the cleaning liquid. In the apparatus to be performed, this apparatus is characterized in that it has a mechanism capable of spreading the cleaning liquid into a thin film state and dissipating and supplying it into the housing.
According to the present invention, it is possible to improve the collection efficiency of tar, carbide, etc., by making the contact state of the gas to be treated with the cleaning liquid favorable.

In addition to the above requirements, the scrubber device according to claim 2 has a mechanism for dissipating and supplying the cleaning liquid into the housing in a thin film state, a dispersion plate disposed in the housing, and a discharge port facing the dispersion plate. And a cleaning liquid supply pipe arranged in such a manner as described above.
According to this invention, the cleaning liquid discharged from the discharge port of the supply rod can be in a state of being developed into a thin film state. Further, the supply rod is not clogged like a nozzle, and blockage due to dust can be avoided.

Furthermore, in addition to the above requirements, the scrubber device according to claim 3 is such that the housing shape of the portion where the processing space is formed is such that the air supply port portion protrudes laterally, and the shape of the processing space is supplied. It is characterized by being in a state of being expanded from the mouth toward the inside.
According to the present invention, the cleaning liquid can be spread over a wide range from the vicinity of the air supply opening toward the processing space.

Furthermore, in addition to the above requirements, the scrubber device according to claim 4 is characterized in that the cleaning liquid is supplied at a plurality of locations.
According to the present invention, the individual cleaning liquids developed in a thin film shape are seamlessly combined so that the flow path of the gas to be processed is closed with the cleaning liquid, and the contact state of the gas to be processed with respect to the cleaning liquid is improved. it can.
The above problems can be solved by using the configuration of the invention described in each of the claims as a means.

  According to the present invention, it is possible to increase the collection efficiency of tar, carbide, etc., and to avoid the clogging of the circulation path of the cleaning liquid, so that the apparatus can be operated continuously for a long time, and the productivity is increased. Running cost can be reduced.

  The scrubber device of the present invention is the best form of the embodiment shown in the drawings, but also includes an apparatus in which this embodiment is appropriately modified within the scope of the technical idea of the present invention.

  FIG. 1 shows a pyrolysis gasification system S to which the scrubber device of the present invention is applied, and this system is an example of a gasification furnace 1, a charging device 2, a hot stove 3, and a scrubber device. The tar scrubber 5, the alkali scrubber 6, the mist separator 7, and the blower 8 are configured. The resin-based industrial waste, coal, and the like are gasified by the gasifier 1 and effectively used as fuel. It is a system to do.

First, the gasification furnace 1 is formed by applying a rotary kiln type device as an example, and both ends of the rotary drum 10 provided with a plurality of lifters 10a on the inner peripheral surface are closed by lid bodies 10A and 10B. At the same time, the boundary between each other is sealed.
Further, the rotary drum 10 has a jacket structure, and hot air is supplied between the jacket outer body 10 </ b> C and the rotary drum 10, so that the workpiece M put into the rotary drum 10 can be heated. It is configured.
The hot air supply port 11 and the exhaust port 12 are formed in the jacket outer body 10C, and the hot air furnace 3 and the exhaust fan 13 are connected to the jacket outer body 10C, respectively.

Further, the lid 10 </ b> A is connected to a charging device 2 to which a screw conveyor is applied as an example, with the discharge portion facing the inside of the rotary drum 10.
On the other hand, a duct 16 in which a discharge port 14 and an exhaust gas port 15 are formed is connected to the lid body 10 </ b> B, and a tar scrubber 5 is connected to the exhaust gas port 15.

As shown in FIG. 2, the tar scrubber 5 supplies a processing gas G and a cleaning liquid L to a processing space 50A formed in the housing 50, and supplies the processing gas G and the cleaning liquid L to each other. It is a gas scrubber that removes dust D (tar and precipitated solid matter) in the gas to be treated G by making contact.
Specifically, as an example, a processing space 50A is continuously provided above a storage space 50B formed by connecting an inverted conical member to a lower portion of a hollow cylindrical member (200φ as an example). Further, an air supply port 51 is formed in the upper side periphery of the processing space 50A, and the shape of the housing 50 of the portion where the processing space 50A is formed is such that the air supply port 51 portion protrudes sideways. It has become a thing. For this reason, the shape of the processing space 50 </ b> A is in a state of being expanded from the air supply port 51 toward the inside.
An exhaust port 52 is formed in the vicinity of the boundary between the storage space 50B and the processing space 50A, and a discharge port 53 is formed at the bottom of the storage space 50B. An outlet 54 is formed therebetween.

A plurality of supply rods 55 are arranged in the upper portion of the processing space 50A. In this embodiment, five supply rods 551 to 555 are provided. The supply rod 55 is, for example, a 6φ metal tube.
Each of the supply rods 551 to 555 is provided with a dispersion plate 55b (50 × 50 mm as an example) in front of the discharge port 55a. In this embodiment, the supply rod 55 is enlarged as shown in FIG. The dispersion plate 55b is fixed to the stay 55c welded to the outer peripheral portion of the. The stay 55c may be fixed to the inner wall of the housing 50, and a dispersion plate 55b may be provided for the stay 55c.
Further, the shape of the dispersion plate 55b is a flat plate shape, but an appropriate shape can be adopted according to the shape of the processing space 50A, and the flat plate as shown in FIG. 2 is bent. It may be a mountain shape.
Further, the shape of the dispersion plate 55b may be one having a curved surface as shown in FIG. 3 (a). In this case, a cleaning liquid L (hereinafter referred to as a thin film cleaning liquid) developed in a thin film shape by the dispersion plate 55b. L1) can also be curved.
Further, as shown in FIG. 3B, the shape of the dispersion plate 55b may be a shape such that the contact time with the cleaning liquid L differs depending on the part, such as a trapezoid. In this case, the thin film cleaning liquid L1 is deflected. Can be.

The outlet 54 and the supply rod 55 are connected by a pipe line, and a circulation pump 56 and a cooler 57 are provided in the pipe line. Further, tar as the cleaning liquid L is filled up to the upper part of the outlet 54 in the storage space 50 </ b> B, whereby the scrubber device functions as the tar scrubber 5.
Incidentally, according to the property of the substance contained in the to-be-processed gas G, you may fill the storage space 50B with the light oil and other liquids as the washing | cleaning liquid L. FIG.

Further, in this embodiment, a plurality of thin film-like cleaning liquids L1 are combined seamlessly so that the flow path of the processing target gas G from the air supply port 51 to the exhaust port 52 is closed with the cleaning liquid L, and the processing target for the cleaning liquid L is obtained. In order to improve the contact state of the gas G, the discharge direction of the supply rods 551 to 555, the shape of the dispersion plate 55b, and the installation location were appropriately set.
The state of the thin film cleaning liquid L1 in the processing space 50A will be described in detail later.

  Furthermore, the alkali scrubber 6 has, for example, the same configuration as that of the tar scrubber 5, and supplies a gas G to be treated to a treatment space 50 </ b> A formed in the housing 50 and an alkaline solution ( A gas scrubber that neutralizes the acid contained in the gas to be processed G by supplying a caustic soda solution or the like and bringing the gas to be processed into contact with the alkaline solution.

  Furthermore, the mist separator 7 is an apparatus for removing mist components (fine particles, oil and moisture) in the gas G to be treated.

The tar scrubber 5 which is an example of the scrubber apparatus of the present invention and the pyrolysis gasification system S configured with the apparatus are configured as described above as an example. Hereinafter, the operation modes of the apparatus and the system will be described. Will be described.
In this embodiment, the resin-based industrial waste is used as the object to be processed M, which is gasified by the gasification furnace 1 and effectively used as a heat source of the pyrolysis gasification system S itself. To do.

First, the gasification furnace 1 and the hot stove 3 are activated to supply hot air to the air supply port 11. The hot air is heated from the rotary drum 10, exhausted from the exhaust port 12, and exhausted to the outside by the exhaust fan 13. Exhausted.
Further, the circulation pump 56 in the tar scrubber 5 is started to circulate the cleaning liquid L, and the cleaning liquid L is discharged from the individual supply rods 55 through the cooler 57 at a high pressure of about 0.2 MPaG. Therefore, it collides with the dispersion plate 55b, disperses along the surface thereof, becomes a thin film-like cleaning liquid L1 developed in a thin film shape, and is diffused and supplied into the processing space 50A.
At this time, as shown in FIG. 4, the individual thin film cleaning liquids L <b> 1 are combined seamlessly so that the flow path of the gas G to be processed from the air supply port 51 to the exhaust port 52 is substantially blocked by the cleaning liquid L. It becomes a state.

Next, the workpiece M is supplied into the rotary drum 10 by the charging device 2, and the workpiece M advances toward the discharge port 14 while being lifted up by the lifter 10a. In response to the thermal decomposition, a combustible gas as the gas to be processed G is generated.
And the to-be-processed gas G (about 700 degreeC) is exhausted from the exhaust gas port 15, and is supplied in 50 A of process space from the air supply port 51 in the tar scrubber 5. FIG.
At this time, the non-gasified component in the workpiece M is generated as char C, which is discharged from the outlet 14 and appropriately disposed of.

In the processing space 50A, when the gas G to be processed advances from the air supply port 51 toward the exhaust port 52 by the suction action of the blower 8, this gas and the gas are effective several times while penetrating through the plurality of thin film cleaning liquids L1. In this case, the dust D is taken into the cleaning liquid L. Incidentally, since the temperature of the gas to be processed G that is in contact with the cleaning liquid L decreases, dust D is also generated in the processing space 50A.
The gas to be treated G cleaned in this manner is further processed by the alkali scrubber 6 and the mist separator 7, and then supplied to the hot stove 3 to be used as fuel.
Note that the cleaning liquid L discharged from the supply tank 55 is cooled to about 100 to 200 ° C. by the action of the cooler 57.
Further, the dust D accumulated in the lower portion of the storage space 50B is periodically taken out from the discharge port 53 and appropriately disposed of.

  On the other hand, after the cleaning liquid L comes into contact with the gas to be processed G, the cleaning liquid L is temporarily stored in the storage space 50B, and is pumped from the outlet 54 by the circulation pump 56 and sent again to the supply rod 55. Unlike nozzles, it does not cause clogging with dust D, and continuous operation is possible.

1 is a skeleton diagram showing a pyrolysis gasification system to which a scrubber device of the present invention is applied. It is a vertical side view which expands and shows a part of scrubber device of the present invention. It is a perspective view which shows the Example of a dispersion plate. It is a perspective view which shows the mode of the thin-film cleaning liquid in the process space.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gasification furnace 10 Rotating drum 10A Cover body 10B Cover body 10C Jacket outer body 11 Air supply port 12 Exhaust port 13 Exhaust fan 14 Exhaust port 15 Exhaust gas port 16 Duct 2 Input device 3 Hot blast furnace 5 Tar scrubber (scrubber device)
50 Housing 50A Processing space 50B Storage space 51 Air supply port 52 Exhaust port 53 Outlet port 54 Outlet port 55 Supply port 55a Discharge port 55b Dispersion plate 55c Stay 56 Circulation pump 57 Cooler 6 Alkaline scrubber 7 Mist separator 8 Blower C Char D Dust G Gas to be treated L Cleaning liquid L1 Thin film cleaning liquid M Object to be processed S Pyrolysis gasification system

Claims (4)

In the apparatus for supplying the gas to be processed to the processing space formed in the housing and supplying the cleaning liquid, and cleaning the gas to be processed by contacting the gas to be processed and the cleaning liquid, the apparatus includes the cleaning liquid A scrubber apparatus characterized by having a mechanism capable of spreading the powder into a thin film state and supplying it into the casing. The mechanism for diffusing and supplying the cleaning liquid into the housing in a thin film state includes a dispersion plate disposed in the housing and a cleaning liquid supply pipe disposed with the discharge port facing the dispersion plate. The scrubber device according to claim 1, wherein the scrubber device is a device. The housing shape of the portion where the processing space is formed is such that the air supply port portion projects sideways, and the shape of the processing space is expanded from the air supply port toward the inside. The scrubber device according to claim 1, wherein the scrubber device is provided. The scrubber device according to claim 1, 2, or 3, wherein the cleaning liquid is supplied at a plurality of locations.

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