JP6559735B2 - Fine powder activated carbon regeneration method and fine powder activated carbon regeneration equipment - Google Patents

Description

  The present invention relates to a method for regenerating finely divided activated carbon and an improvement of a regenerating apparatus for finely divided activated carbon, in which deodorization mainly using activated carbon is performed with a dust collector so that the activated carbon can be recycled.

In industries where odor generation is significant, such as foundries, it has been required to improve the work site and the surrounding environment to remove or decompose the generated odor.
Since activated carbon has a deodorizing function, it has been used for many deodorizing purposes for household use, such as odor removal from refrigerators, odor decomposition and elimination in factories.
However, activated carbon has an excellent deodorizing function, but it has the disadvantage that the deodorizing function is immediately reduced. It was.

  Generally, what is used as activated carbon for fixed-bed type deodorizers for deodorization so far has a particle size of about 3 mm to 4 mm, most of which is 10 mm to 20 mm granular. Since the granular activated carbon is exchanged in a batch system, the initial deodorizing function is remarkably deteriorated and needs to be replaced immediately. Therefore, it is necessary to develop a regenerating apparatus for regenerating the deodorizing function.

  As this regeneration device, the used activated carbon is heated at 400 to 600 ° C. by a large device (about 200 to 300 million yen) such as a rotary kiln, and the odor is separated from the activated carbon by rotation or stirring. However, the activated carbon is partially pulverized by rotation and stirring and cannot be reused. Usually, the deodorizing function recovers by about 70% to 80% while passing through the rotary kiln, but it is lost by about 20%. It has been. The prior art described above is disclosed in the following document.

JP2009-190019 JP2008-030010 JP2012-176392

In the above-mentioned conventional technology, although the regeneration of activated carbon is attempted, the function regeneration is also about 70 to 80%, the loss is about 20%, the economy is very bad, and the apparatus is a large-sized rotary kiln. As a result, there was a problem that the replacement ratio of activated carbon was high and the running cost was high.
Incidentally, the odor index of about 24 is the limit in the case of activated carbon having a particle diameter of 10 mm to 20 mm and a fixed bed recovery type. This odor index is shown in Table 1 described later. When used in a deodorizing dust collector of 1500 m3 (Lube) / min, the activated carbon requires 33,600 Kg / year, and the annual running cost becomes very expensive.
Therefore, it is required to increase the function regeneration efficiency of activated carbon having an excellent deodorizing function and to suppress recovery loss as much as possible.

  In view of the present situation, an object of the present invention is to provide a method for regenerating fine activated carbon and a regenerating apparatus for fine activated carbon that can exhibit high functional regeneration efficiency and can maintain a high regeneration recovery rate.

The present invention is an activated carbon regeneration system for performing for achieving the above object, the reproduction of the spent fine active compound of 60 microns ± 50 microns used in the deodorizing apparatus.
A method,

That is, the activated carbon regenerator for regenerating the 60 micron ± 50 micron used fine powder active material used in the deodorizing apparatus of the present invention regenerates the 60 micron ± 50 micron used fine powder active material used in the deodorizing apparatus. Is provided with supply means (2) for supplying spent finely divided activated carbon to a regeneration chamber (1) equipped with an off-line pulse jet bag filter (1A). A hot air supply duct (3) is connected to the bottom and a recovery mechanism (4) for recovering the regenerated finely divided activated carbon is provided. The odor hot air exiting the regeneration chamber (1) is connected to the online pulse jet bag filter (10A). It led to the second regeneration chamber 10 having a cooling tower for cooling the odor hot air exiting the second regeneration chamber 10 (5) provided, exiting the cooling tower (5) A decompression pump device (6) for sucking the odor temperature air is provided, a combustion chamber (7) for thermally decomposing the odor temperature air exiting the decompression pump device (6) is provided, and the combustion chamber (7) The hot air is discharged to the atmosphere through a heat exchanger (8), and the heat exchanger (8) is provided with an air inlet (9), and the air taken in from this is exchanged by heat exchange. 200 ° C. is heated to ± 30 ° C., the are hot air supplied to the regeneration chamber supplied through a duct (3) (1), the pressure reducing pump device (6) connected to said regeneration chamber absolute (1) creating a vacuum in the pressure 12 kPa ± 3, the pulverized activated carbon was separated migrate odor had been adsorb exposed to hot air at the reduced pressure in the hot air, revitalization of the pulverized activated carbon was taken means of.

According to the method and apparatus of the present invention, a function recovery rate of about 90% to 95% is achieved with a recovery rate of about 99% for 60 micron (± 50 micron) fine activated carbon that exhibits an excellent deodorizing function. It has come to be able to do it. Such a result can be realized by exposing fine activated carbon to about 200 ° C. (± 50 ° C.) under a reduced pressure of 12 kPa (± 3 kPa) absolute pressure. The physical or chemical action of odor separation under this temperature and reduced pressure is not clear, but it has been confirmed that it is actually able to exert excellent action and effect. It does not exist. In the first place, the surface area can be increased several hundred times from the conventional activated carbon particle size of 10 mm to 20 mm to the particle size of 60 μm ± 50 μm of the present invention. In addition to this, the empty odor can be degassed under the above-mentioned special conditions of absolute pressure of 12 kPa (± 3 kPa) and about 200 ° C. (± 50 ° C.). The effect peculiar to the present invention is obtained.
The odor hot air is heat-treated in the combustion chamber and released into the atmosphere, so that there is an advantage that the odor hot air can be reduced to the odor index 21.
Other advantages of the present invention will become apparent from the description of the following examples.

In carrying out the present invention, the odor hot air exiting the regeneration chamber (1) is guided to the secondary bag filter (10) provided with the online pulse jet bag filter (10A), and by any chance, the regeneration chamber (1). Even if there is any damage, it is preferable that the configuration is such that it can be prevented from passing through 7 and leaking to the outside (combustion chamber).
In this way, by supplementing the fine activated carbon in two steps, the activated carbon can be reliably recovered and recovered.
The on-line pulse jet bag filter (10) of the present invention is an invention created by the inventor himself, and has been patented not only in Japan but also in the United States and other countries as follows. .
That is, Japanese Utility Model Publication No. 63-130870 is U.S. Pat. No. 5,159,737, Japanese Utility Model Publication No. 58-132524 is U.S. Pat. No. 4,486,205, and many other applications have been patented. See these publications.
The feature is that a dust collection chamber with a bag filter is divided into a plurality of compartments, and branch ducts corresponding to each compartment are provided, and are connected to the exhaust fan through the rear assembly duct. The open / close dampers are provided, and the compartments closed by opening and closing the dampers are in a dust collection stop state, and the damper opening compartments are in a state where the dust collection function can be exhibited. As a whole, the filter can be removed by a pulse jet at any time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic front view of an entire apparatus used for carrying out an activated carbon regeneration method for regenerating used fine powder actives according to the present invention. Table 1 showing the performance of the present invention Table 2 showing comparison between the present invention and the prior art

Hereinafter, preferred embodiments of an activated carbon regeneration method and apparatus for regenerating used fine powder actives according to the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, in the present invention, the treatment is performed on 60 μm ± 50 μm used fine powder actives used in the deodorization apparatus. The finely divided activated carbon having such a particle size can exhibit the maximum deodorizing performance.

This activated carbon regenerator is configured as follows.
Supply to supply spent finely powdered activated carbon to the regeneration chamber 1 equipped with an off-line puljet bag filter 1A (this is a system in which pulse injection is performed in a compartment where the line is shut off, and other compartments are collecting dust). Means 2 is provided, a hot air supply duct 3 is connected to the bottom of the regeneration chamber 1, and a recovery mechanism 4 for recovering the regenerated finely divided activated carbon is provided. The off-line puljet is performed at a rate of 6 kg / cm 2 (centimeter square meter) for 0.1 seconds. The supply means 2 is a pneumatic transport system. Further, the regenerated finely powdered activated carbon is taken out from the side of the bottom from the regenerating chamber 1 (inclined plate provided with hot air passing holes provided in the bottom: indicated by a broken line in FIG. 1). In addition, the regenerated fine powder activated carbon that has moved to the secondary bag filter 10 is taken out from an on-off valve provided at the bottom of the secondary bag filter 10.

  And the odor hot air (about 200 degreeC) which came out of the said reproduction | regeneration chamber 1 is guide | induced to the secondary bag filter 10 provided with 10 A of online pulse jet bag filters (this is the system which performs pulse injection in the state which does not interrupt | block a line). In addition, the contact time between the hot air and finely powdered activated carbon is lengthened to increase the odor separation efficiency. The on-line puljet is 6 kg / cm 2 (centimeter square meter), and is performed by jetting for 0.1 second.

And the cooling tower 5 (water cooling system) which cools the odor hot air (about 180 degreeC) which came out of the secondary bag filter 10 is provided, and the decompression pump which sucks the odor temperature air (about 40 degreeC) which came out of the cooling tower 5 A device 6 is provided. Here, the decompression pump device 6 is constituted by a gear system (may be a roots type in some cases). In order to maintain the function by thermal expansion, it is difficult at high temperature, and the temperature of the air must be suppressed to about 40 ° C.
A combustion chamber 7 is provided for heat-decomposing the odor air temperature (about 40 ° C.) from the decompression pump device 6. Here, a burner (which may be heavy oil or other gas fuel) that can be heated to 600 ° C. is used so that the odor can be thermally decomposed.
The hot air exiting the combustion chamber 7 is configured to be released to the atmosphere via a heat exchanger 8 (heating of air), and the heat exchanger 8 is provided with an air inlet 9 and taken in from here. The atmosphere is heated to 200 ° C. ± 50 ° C., supplied to the regeneration chamber 1 through the hot air supply duct 3, and reduced in absolute pressure of 12 kPa ± 3 in the regeneration chamber 1 connected to the decompression pump device 6. It is configured to produce.

  As described above, the activated carbon regeneration for regenerating the used fine powder active substance of 60 μm ± 50 μm used in the deodorizing apparatus is performed by applying hot air at 200 ° C. ± 30 ° C. under a reduced pressure of 12 kPa ± 3 absolute pressure. The pulverized activated carbon supplied from the bottom of the regeneration chamber 1 is exposed to the hot air in the reduced pressure state (floating state), and the adsorbed odor is separated and transferred to the hot air. The regenerated finely divided activated carbon that has been heated through the air and then released into the atmosphere and separated by the bag filter is recovered from the regeneration chamber 1.

The odor index referred to in Table 1 is based on the following definition.
Find the dilution factor (odor concentration) when the scented air or water is diluted with odorless air (in the case of water, odorless water) until you no longer feel the odor, and multiply the common logarithm by 10 Define. The calculation formula is as follows. For example, when a malodorous sample is diluted 100 times, when most people do not feel odor, the odor concentration is set to 100 and the odor index is 20.
Odor index = 10 × log (odor concentration) (Example) 10 × log (100) = 20

  In Table 2, the new technology refers to the present invention, where the processing pressure is 12 kPa absolute. However, if the pressure is 12 kPa ± 3, an approximate result is obtained. The deodorizing effect is not clear in physical or scientific reactions, but it has been confirmed that an excellent regeneration function can be expressed.

  The present invention can be easily implemented using the bag filter function, and can be expected to be implemented not only in a foundry but also in a wide range of fields such as a marine industry where bad odor is generated.

1: Regeneration chamber 1A: Paljet bag filter 2 of regeneration chamber 2: Supply means 3: Hot air supply duct 4: Recovery mechanism 5: Cooling tower 6: Decompression pump device 7: Combustion chamber 8: Heat exchanger 9: Atmospheric inlet 10 : Secondary bag filter 10A: Pulse bag bug filter of secondary bug filter

Claims (1)

An activated carbon regenerator for regenerating used fine powder active material of 60 microns ± 50 microns used in a deodorizing device,
A supply means (2) for supplying spent finely divided activated carbon is provided in the regeneration chamber (1) equipped with an offline paljet bag filter (1A), and a hot air supply duct (3) is connected to the bottom of the regeneration chamber (1). In addition, a recovery mechanism (4) for recovering the regenerated finely divided activated carbon is provided, and the odor hot air exiting the regeneration chamber (1) is led to the secondary bag filter (10) equipped with the online pulse jet bag filter (10A). A cooling tower (5) for cooling the odor hot air exiting the secondary bag filter (10) , and a vacuum pump device (6) for sucking the odor temperature air exiting the cooling tower (5), A combustion chamber (7) for thermally decomposing the odor temperature air coming out of the decompression pump device (6) is provided, and the hot air coming out of the combustion chamber (7) is released into the atmosphere via the heat exchanger (8). Composed of the heat An air inlet (9) is provided in the exchanger (8), and the air taken in from the air inlet (9) is heated to 200 ° C. ± 30 ° C. by heat exchange, and the regeneration chamber is passed through the hot air supply duct (3). The regeneration chamber (1) supplied to (1) and connected to the decompression pump device (6) generates a decompression with an absolute pressure of 12 kPa ± 3, and is adsorbed by exposing the fine activated carbon to hot air in the decompressed state. An apparatus for regenerating finely divided activated carbon, wherein the odor is separated and transferred to hot air to regenerate the finely divided activated carbon.

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