KR20070089037A - A method and apparatus for bamboo activated carbon - Google Patents

Abstract

An apparatus and a method for manufacturing bamboo activated carbon are provided to promote the activation reaction of bamboo coal even while minimizing the structural change of a rotary kiln furnace, thereby promptly forming more fine pores in the bamboo activated carbon. A cylinder-shaped rotary kiln furnace(2) is supported by a support roller. A burner(3) is installed at an inlet side of the rotary kiln furnace, through which bamboo is inputted. A steam supply pipe(4) is internally extended from the inlet side of the rotary kiln furnace to supply steam for a gasification reaction of bamboo coal. A reflux gas supplying pipe(20) is installed within the rotary kiln furnace. The reflux gas supplying pipe collects discharge gas at an outlet side of the rotary kiln by a blower(21) and supplies reflux gas containing carbon monoxide into the rotary kiln furnace so as to promote the activation reaction of the bamboo coal.

Description

Bamboo activated carbon manufacturing method and apparatus {A METHOD AND APPARATUS FOR BAMBOO ACTIVATED CARBON}

1 is a schematic longitudinal sectional view of a rotary kiln for performing the bamboo activated carbon production method of the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

Explanation of symbols on the main parts of the drawings

         1: Hopper 2: Kiln

         3: burner 4: steam supply pipe

         10 roller 12 gear

20 gas supply pipe 21 blower

The present invention relates to a method and apparatus for producing bamboo activated carbon, and more particularly, to a method and apparatus for manufacturing bamboo activated carbon improved to obtain finer bamboo activated carbon by increasing fine pores and surface area.

In general, bamboo activated carbon has a fine porous structure and based on the acidity and activity point of the fine surface, beneficial microorganisms on the surface, foreign substances and microorganisms are adsorbed on the surface, and are widely used for purifying air and water. It can also be used for removing odors and controlling humidity by suppressing the occurrence of odor and adsorbing and removing odor-causing substances.

The bamboo activated carbon is carbonized in pieces or particles of bamboo charcoal, for example, by heating at a high temperature of 800 to 1200 ° C. in a rotary kiln and supplying water vapor in an integrated state. ) Will be made.

That is, C + H 2 O → CO + H 2

          CO + H2O → CO2 + H2

C + 2H2O → CO2 + 2H2

          C + CO2 → 2CO

Since this activation reaction is an endothermic reaction, the temperature may drop rapidly in the kiln furnace, so the internal temperature must be maintained within the range of 800 to 1200 ° C. by the heating device.

This activation reaction results in the formation of many fine pores in the bamboo activated carbon, but carbon can be burned at excessively high temperatures, and carbonization takes a long time at too low temperatures, resulting in lower productivity and less micropores. The quality control of the activated carbon is a key element of the bamboo activated carbon production apparatus because the quality of the activated carbon is caused and the fuel cost is increased due to the long carbonization process.

The present invention is to improve the production of bamboo activated carbon to solve the problems according to the method of manufacturing the activated carbon in the conventional rotary kiln to promote the activation reaction while minimizing the structural change of the rotary kiln to form more fine pores more quickly To provide a method.

In addition, the present invention provides an excellent bamboo activated carbon production apparatus designed to reflux and supply a portion of the flue gas containing carbon monoxide in the region of the outlet side of the rotary kiln to promote the activation reaction so that more fine pores can be formed For the purpose.

Bamboo activated carbon manufacturing method according to the present invention is a step of obtaining a bamboo charcoal obtained by carbonizing the bamboo pieces, charging the bamboo charcoal in a rotary kiln furnace to activate the bamboo charcoal to increase the fine pores and surface area of the bamboo charcoal particles; It includes, in the bamboo charcoal activation step to activate the bamboo charcoal through the water gasification of the bamboo charcoal particles heated by steam supplied from the steam supply pipe, to promote the aqueous hydrolysis of carbon in the heated bamboo charcoal particles A part of flue gas is refluxed and supplied, It is comprised.

In addition, the bamboo activated carbon production apparatus according to the present invention is a cylindrical shape is supported by a rotating support rotary roller kiln, the burner is installed on the inlet side of the bamboo charcoal is charged, steam supply for the water gasification reaction of bamboo charcoal Steam supply pipes installed extending from the inlet side of the rotary kiln to facilitate the gas reaction of the bamboo charcoal in the generating kiln. A part of the exhaust gas is refluxed by a blower to the outlet side of the rotary kiln furnace to activate activated gas containing carbon monoxide. It characterized in that it comprises a reflux gas supply pipe installed inside the rotary kiln to supply the inside of the rotary kiln.

Hereinafter, a method for manufacturing bamboo activated carbon of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 schematically show the structure of a rotary kiln furnace for performing the bamboo activated carbon production method according to the present invention.

Bamboo activated carbon manufacturing apparatus according to the present invention has a kiln furnace structure, the cylindrical kiln furnace is supported by the support roller to rotate (2) installed, the burner (3) installed on the inlet side of the bamboo charcoal, water gasification It comprises a steam supply pipe (4) for the steam supply for the reaction.

In addition, a gas supply pipe 20 for reflux supplying some of the flue gas including carbon monoxide by the blower 21 is installed on the outlet side of the rotary kiln 2 to extend into the rotary kiln, thereby supplying carbon monoxide supplied. The reflux gas is activated to promote the activation of bamboo charcoal.

Hereinafter, the bamboo activated carbon production method according to the present invention using the bamboo activated carbon production apparatus will be described.

Raw material of bamboo activated carbon The pieces of bamboo charcoal are fed into the kiln furnace 2 through a screw conveyor from the hopper 1 into the rotary kiln furnace 2.

The kiln furnace 2 has a cylindrical shape and the inlet side is opened to supply bamboo charcoal particles from the hopper through a conveyor, while a burner 3 is installed to heat the inside of the kiln furnace and hot steam for gasification reaction. A steam supply pipe 4 for supplying steam by a steam supply device not shown in the drawing is disposed to supply the gas, and an outlet 5 for discharging the gas and discharging the bamboo activated carbon is formed at the outlet side. And a support device 6 is installed to rotatably support the kiln furnace 2.

In addition, the inlet side of the kiln furnace rotatably supports the kiln furnace 2 and a drain portion 7 for collecting the bamboo charcoal particles introduced into the kiln furnace if it is discharged through an open inlet. It is installed and the outlet is closed when operating with kiln.

The kiln furnace 2 is rotatably supported by the support rollers 10 on both sides, as shown in cross-sectional view in FIG. 2 near both end portions, and the kiln furnace is damaged by impact against the support rollers. For example, a shock absorbing member 11 such as a tire is provided to smoothly rotate without receiving.

The kiln furnace 2 is inclined at 2 °-8 ° so that the inlet side is higher than the outlet side, so that the bamboo charcoal loaded therein can be automatically transferred to the outlet while the kiln furnace is rotated.

In addition, the gear 12 is fixedly installed around the outer circumferential surface of the kiln at an inner position from both end portions of the kiln furnace 2, and the gear 12 is a pinion gear driven by the motor 15. The kiln furnace 2 is rotated by being engaged with (16).

In this kiln furnace structure, a portion of the flue gas containing carbon monoxide gas is passed through the recovery pipe 22 to promote the activation reaction through the gas supply pipe 20 arranged to extend inwardly from the outlet side according to the present invention. The reflux is supplied by the blower 21.

The reflux gas supply pipe 20 is arranged to be at least coincident with the center of rotation of the kiln furnace 2 or inclined upwardly by about 2-5 ° to disperse the bamboo activated carbon particles located at the bottom of the kiln furnace during rotation. It is desirable to avoid.

In the rotary kiln furnace of the above structure will be described the bamboo activated carbon manufacturing process according to the present invention.

Bamboo activated carbon is the first step to make bamboo charcoal from pieces of bamboo, and the second step is to activate the bamboo charcoal to produce activated carbon.

As a first step, the process of manufacturing bamboo charcoal is by cutting the bamboo into pieces of a certain size, for example 2cm ~ 3cm size and stored in the hopper (1) of Figure 1, by the burner (3) The rotary kiln furnace 2 is preheated to 600 ° C. The rotary kiln furnace (2) is preheated, and then charged into the rotary kiln furnace with a small amount of the bamboo pieces received in the hopper by a conveying means such as a screw conveyor provided at the bottom of the hopper. The internal temperature is raised.

After 8 to 10 hours after the charging of the bamboo pieces, the internal temperature of the rotary kiln is raised to about 800 ° C. From this time, the bamboo pieces are charged into the rotary kiln at a constant speed from the hopper 1.

The rotary kiln 2 sets the rotational speed so that it takes about 4 hours until the carbon pieces are charged and discharged while moving inside according to the rotation of the inclined rotary kiln.

Since the pieces of bamboo are charged into the rotary kiln and the residence time is about 2 hours, steam is introduced through the steam supply pipe 4 to prevent excessive oxidation of the bamboo charcoal. In this way, the bamboo pieces are carbonized with bamboo charcoal and discharged to the outlet after 4 hours of charging in the rotary kiln furnace. The bamboo charcoal produced in this way can be used as a general charcoal and used as a raw material for the second stage bamboo charcoal activated carbon.

Although it was described above to carbonize the bamboo pieces with bamboo charcoal in the rotary kiln (2), such bamboo charcoal may be used as a raw material of bamboo charcoal activated carbon to be described below by manufacturing with a conventional charcoal manufacturing method and equipment.

As a second step, the process of producing activated charcoal of bamboo charcoal is charged into the kiln into the hopper (1) by charging the bamboo charcoal prepared in the first step described above, and continuously fed into the kiln by a screw feeder, and by a burner in an area adjacent to the inlet side. The raw material is moved toward the center and the outlet as the kiln is rotated in an inclined state and heated to 800-1200 ° C, and the carbon of the bamboo charcoal in which the steam supplied by the steam supply pipe 4 is glowing The carbon and water molecules react with each other to generate carbon monoxide and hydrogen. Secondly, the carbon monoxide and water molecules react to activate the carbon dioxide and hydrogen molecules.

At this time, as the carbon atoms contained in the bamboo charcoal reacts with water molecules to form carbon monoxide and carbon dioxide, the inner pores of the bamboo charcoal become larger and new micro pores are formed innumerably. According to the present invention, carbon monoxide is provided through the gas supply pipe 20. By replenishing and supplying the exhaust gas containing reflux, the activation reaction is further promoted, thereby shortening the time required for activation, thereby reducing the energy requirement, thereby producing a high quality bamboo activated carbon having a well-developed surface area.

It is evident that the supporting device 6 on the outlet side of the kiln furnace can provide additional equipment for heat recovery from the discharged activated carbon and gas. I use it.

According to the present invention, by charging bamboo charcoal in a rotating kiln furnace and heating it with a burner, the water of the carbonized bamboo charcoal particles reacted with water molecules to produce steam and water gasification reaction occurs as carbon monoxide and carbon dioxide. In the process of manufacturing bamboo activated carbon, some of the exhaust gas containing carbon monoxide is refluxed from the outlet through the supply pipe to further promote the activation reaction of the bamboo activated carbon, thereby increasing the fine pores and increasing the surface area of the bamboo activated carbon. Adsorption of bamboo activated carbon has the advantage that the function is further improved, and the activation through the water gasification reaction under the charging and heat of the bamboo charcoal, steam supply is made more quickly, and thus can also reduce the fuel cost.

Claims (3)

Carbonization of the bamboo pieces by heating to 500 ~ 800 ℃ to obtain a bamboo charcoal formed with fine pores, charging the bamboo charcoal in a rotary kiln furnace to activate the bamboo charcoal to increase the fine pores and surface area in the bamboo charcoal particles The bamboo charcoal activation step includes activating the bamboo charcoal at a temperature of 800˜1200 ° C. through an aqueous gasification reaction of the bamboo charcoal particles heated by steam supplied from a steam supply pipe (4). Bamboo activated carbon production method characterized by supplying carbon monoxide to promote the activation reaction of carbon in the particles. The method of claim 1, wherein the carbon monoxide supply recovers and supplies exhaust gas discharged. The rotary kiln furnace 2, which is cylindrical in shape and supported by the support roller to rotate, the burner 3 installed at the inlet side where the bamboo charcoal is charged, and the rotary kiln furnace inlet to supply steam for the water gasification reaction of the bamboo charcoal. The exhaust gas is recovered by the blower 21 at the outlet side of the rotary kiln furnace 2 so as to promote the activation of the steam supply pipe 4 and the bamboo charcoal installed extending from the side to return reflux gas containing carbon monoxide. Bamboo activated carbon production apparatus characterized in that it comprises a reflux gas supply pipe (20) installed inside the rotary kiln to supply the inside of the rotary kiln.

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