JP2001220118A - Activated cabon manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an activated carbon manufacturing device by which activation is surely and efficiently performed only by steam, and the good-quality activated carbon increased in specific surface is obtained. SOLUTION: A hopper 2 and an inlet feeder 3 are provided on the inlet side (the right side in the figure) of a quartz rotary kiln 1 formed from a quartz- glass tube. An exhaust pipe 4 for waste gas and a discharge pipe 5 are furnished on the outlet side (the left side in the figure) of the kiln 1, and the discharge pipe 5 is provided with a feeder 6. An electric heater 7 is furnished around the practically full length of the kiln 1, and a steam supply pipe 8 for introducing steam into the kiln is provided at the inlet of the kiln 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an activated carbon production apparatus used for gas treatment, water treatment and other purposes.
More specifically, the present invention relates to an activated carbon production apparatus capable of efficiently activating primary carbides and obtaining high quality activated carbon.

[0002]

2. Description of the Related Art Conventionally, activated carbon production processes include a carbonization process,
The activation steps are performed in this order. In this activation step, the primary carbide produced in the carbonization step is subjected to a high-temperature oxidation reaction (800 to 900 ° C.) mainly using gas as an oxidant,
Volatile components such as tar in the primary carbide are removed, and the specific surface area is increased by increasing the porosity to increase the adsorption capacity as activated carbon.

Conventionally, many studies have been conducted on the activation operation, and steam, carbon dioxide, air, or a mixed gas thereof is used as an oxidizing agent for gas activation. And the specific surface area of the product (activated carbon) could be maximized. These facts are described in "Activated Carbon Reader", published by Nikkan Kogyo Shimbun, published by Hiroshi Yanai, page 118, and the like.

[0004] However, an activation furnace using pure steam as an oxidizing agent has not been industrially used. The reason is described below.

[0005] The activation reaction of the primary carbide using steam is represented by the following reaction formula. H ₂ O + C _X → H ₂ + CO + C _X-1 +28178 kc
al / mol

The activation reaction of primary carbide by steam is
It is an endothermic reaction as shown in the above formula, and this reaction is
In order to perform the heating at a high temperature of 00 ° C., it is necessary to perform forced heating from the outside together. Therefore, in the conventional method, a high-temperature combustion gas is mixed with steam, and used as an oxidizing agent and a heating medium for activating the primary carbide.

FIG. 4 shows an example of a conventional activation furnace. In such a conventional activation furnace, the primary carbide 21 is charged from the hopper 22 into the internally heated rotary kiln 24 by the charging mechanism 23, and the steam as the oxidizing agent and the combustion serving as a heating heat source for the endothermic reaction are used. The mixture is supplied with a gas. The inside of the rotary kiln 24 is maintained at 800 to 900 ° C., and while the primary carbide 21 is being conveyed in the rotary kiln 24, activation is performed, and activated carbon is generated.

[0008]

However, in the conventional activation furnace described above, the activation is carried out not in an atmosphere of pure steam but in an atmosphere mixed with a combustion gas. It was inferior to the case of activation.

[0009] In order to solve such disadvantages of the internally heated rotary kiln, it is conceivable to employ an externally heated rotary kiln. However, in an externally heated rotary kiln, although the inside of the rotary kiln can be a pure steam atmosphere, external heating becomes difficult. In other words, in a method in which a rotary kiln is made of a heat conductive type material such as a metal material and heated from the outside with a high-temperature combustion gas, a large heat transfer area is required to maintain the inside of the rotary kiln at a high temperature of 800 ° C or more. Was to do. Further, even if an attempt is made to transfer heat by radiation, since the material used does not transmit light, it has been difficult to heat by radiation. Furthermore, even in terms of material strength, heating to a temperature close to 1000 ° C. has a serious problem.

[0010] The present invention solves the above-mentioned problems, and can reliably and efficiently activate with only steam.
It is an object of the present invention to provide an activated carbon manufacturing apparatus capable of obtaining high quality activated carbon.

[0011]

According to a first aspect of the present invention, there is provided an activated carbon manufacturing apparatus comprising: a quartz rotary kiln formed of a quartz glass tube; a charging means for charging primary carbide before activation from one side of the quartz rotary kiln; A steam supply means for supplying steam into the kiln; and a radiant heating means for heating the primary carbide conveyed in the quartz rotary kiln from outside the rotating quartz rotary kiln by radiant heat. Have been.

[0012] In the activated carbon manufacturing apparatus according to the first aspect, the primary carbide charged in the quartz rotary kiln is
It can be heated by a radiant heating means, and activation is performed by introducing only steam without the need for a combustion gas.

According to a second aspect of the present invention, there is provided an activated carbon manufacturing apparatus comprising: a conveying means for moving a primary carbide before activation; a quartz glass plate covering the conveying means; It is characterized by comprising steam supply means for supplying steam to the space therebetween, and radiant heating means for heating the primary carbide conveyed from above the quartz glass plate by radiant heat.

In the activated carbon manufacturing apparatus according to the second aspect, the primary carbide on the conveying means can be heated by the radiant heating means through the quartz glass plate, and only the steam is produced without the need for the combustion gas. Introduce and activate. Further, the water vapor supplied to the quartz glass plate is held on the conveying means.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, at least a part of a component part of a vessel for performing an activation reaction is formed of quartz glass, that is, a rotary kiln is made of a quartz glass tube, and a primary kiln is formed. A plate covering the carbide transport mechanism is made of a quartz glass plate. By using quartz glass in this manner, heating can be performed by radiant heat from the outside. That is, quartz glass not only transmits almost 100% of light in the visible light region, but also transmits light having a wavelength of up to about 4 μm at a high transmittance in the infrared region, and has high heat resistance. . By the way, ordinary soda glass can be considered as long as it can be simply heated by radiant heat, but ordinary soda glass has low transmittance, poor radiation heat transfer efficiency, and operation under high temperature conditions. Have a problem in material strength.

The heat resistance of the quartz glass is 1000 ° C.
It is preferable that there is a degree.

Various conveyors, reciprocating grate, and the like can be used as the conveying means.

As the radiant heating means, an electric heater, a flat combustion burner, a gas flame burner or the like can be used.

The steam supply means is not particularly limited as long as it can supply steam, and the steam supply point may be an inlet, an outlet, or an intermediate point.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment (corresponding to claim 1) of an apparatus for producing activated carbon according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view of an apparatus for producing activated carbon.
In this figure, reference numeral 1 denotes a quartz rotary kiln made of a quartz glass tube, and a hopper 2 and a feeder 3 are provided on the inlet side (right side in the figure) of the quartz rotary kiln 1. Exit side of quartz rotary kiln 1 (left side in the figure)
Is provided with an exhaust pipe 4 for exhaust gas and a discharge pipe 5, and the discharge pipe 5 is provided with a feeder 6. An electric heater 7 as a radiant heating means is provided on the outer periphery of substantially the entire length of the quartz rotary kiln 1.
At an inlet of the rotary kiln 1, a steam supply pipe 8 for introducing steam into the inside is provided.

In the activated carbon manufacturing apparatus as described above,
The primary carbide (raw material) 9 is continuously supplied into the rotary kiln 1 by the charging mechanism 3, steam is supplied from the inlet of the rotary kiln 1, and the primary carbide 9 is heated by the electric heater 7. Thereby, the primary carbide 9 is activated to obtain activated carbon, which is sent to the next step through the discharge pipe 5. Hydrogen and carbon monoxide generated by the activation are discharged from the exhaust pipe 4.

A second embodiment (corresponding to claim 2) of an apparatus for producing activated carbon according to the present invention will be described with reference to the drawings.

FIG. 2 is a schematic diagram of an apparatus for producing activated carbon.
In this figure, reference numeral 11 denotes a conveyor as a transport means.
Above the conveyor 11 is a quartz plate 12 made of quartz glass.
An electric heater 13 is provided above the quartz plate 12 as radiant heating means. A steam supply pipe 14 for supplying steam between the conveyor 11 and the quartz plate 12 is provided near the inlet side (the right side in the figure) of the quartz plate 12.

A hopper 15 and a charging feeder 16 are provided on the inlet side of the conveyor 11, and exhaust gas for exhausting gas generated by activation of H ₂ , CO, etc. is provided on the outlet side (left side in the figure). A pipe 17 is provided, and a discharge pipe 18 for discharging activated carbon and a feeder 19 are provided.

In the activated carbon manufacturing apparatus as described above, the primary coal (raw material) 20 charged into the hopper 15 is continuously supplied to the conveyor 11 by the charging feeder 16 and the steam is supplied between the conveyor 11 and the quartz plate 12. Is supplied, and the primary carbide 20 is further heated by the electric heater 13. Thereby, the primary carbide 20 is activated to obtain activated carbon, which is sent to the next step through the discharge pipe 18. Hydrogen and carbon monoxide generated by the activation are discharged from the exhaust pipe 17.

The specific surface area of activated carbon obtained by activating with pure steam as in the above examples was compared with the specific surface area of activated carbon obtained by activating with air and combustion gas. Fig. 3 shows the results.
Shown in From the results of FIG. 3, it was confirmed that when pure steam was used, the specific surface area was greatly improved.

[0028]

The present invention has the following effects by adopting the above structure. (1) By using quartz glass as the reaction vessel material of the activation furnace, the primary carbide can be heated by radiant heating from the outside, and the activation reaction can be performed in an atmosphere of pure steam. (2) As a result, the specific surface area of the obtained activated carbon is greatly improved.

[Brief description of the drawings]

FIG. 1 is a schematic view of a first embodiment of an activated carbon manufacturing apparatus according to the present invention.

FIG. 2 is a schematic view of a second embodiment of the activated carbon manufacturing apparatus according to the present invention.

FIG. 3 is a graph comparing the specific surface areas of activated carbon obtained when steam, air, and combustion gas are used as an oxidizing agent.

FIG. 4 is a schematic view of a conventional activated carbon production device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Quartz rotary kiln 2 ... Hopper 3 ... Input feeder 4 ... Exhaust pipe 5 ... Discharge pipe 6 ... Feeder 7 ... Electric heater 8 ... Steam supply pipe 9 ... Primary carbide 11 ... Conveyor 12 ... Quartz plate 13 ... Electric heater 14 ... Steam Supply pipe 15 ... Hopper 16 ... Input feeder 17 ... Exhaust pipe 18 ... Discharge pipe 19 ... Feeder 20 ... Primary carbide

Claims (2)

[Claims] 1. A quartz rotary kiln made of a quartz glass tube, a feeding means for feeding primary carbide before activation from one side of the quartz rotary kiln, a steam supply means for supplying steam into the quartz rotary kiln, and a rotary kiln. An activated carbon manufacturing apparatus, comprising: radiant heating means for heating, by radiant heat, primary carbides conveyed through the quartz rotary kiln from outside the quartz rotary kiln. 2. A conveying means for moving the primary carbide before activation, a quartz glass plate covering the conveying means,
A steam supply unit for supplying steam to a space between the conveyed primary carbide and the quartz glass plate; and a radiant heating unit for heating the primary carbide conveyed from above the quartz glass plate by radiant heat. Activated carbon production equipment characterized by the following.