KR790001078B1 - Apparatus for regeneration of spent wet active carbon - Google Patents

Abstract

Apparatus consisted of outer(11) and inner(10) sleeves having many perforation(13) concentrically set against each wall of a heating furnace(7) with a burner. wet active carbon was exhausted to the heating furnace via the outer perforation as extractive gas from wet active carbon dried by hot air obtained from the exhausting gas of combustion then sent to the regenerating chamber.

Description

Regeneration device of wet activated carbon

1 is an apparatus diagram of an embodiment of the present invention when the wet activated carbon is dried as air preheated by heat exchange with combustion gas.

2 is an apparatus diagram of an embodiment of the present invention in the case of drying the wet activated carbon as a combustion gas.

3 is an apparatus diagram of an embodiment of the present invention in the case where wet activated carbon is easily and directly dried by hot air obtained by heat exchange with flue gas from a heating furnace in a drying means provided between a screw feeder and a regeneration chamber.

The present invention relates to an improvement of the regeneration apparatus of wet activated carbon, and more particularly, to a regeneration apparatus of wet activated carbon discharged mainly in connection with water pollution prevention measures. Generally, regeneration of wet activated carbon is supplied once or continuously by supplying activated carbon to the room made of heat transferable heat-resistant material installed in the furnace, introducing regeneration water vapor into the room, and drying, firing, and revitalization by heating from the outside. It will go through three processes. However, in the conventional regeneration apparatus generally used, the structure, the degree of wetness of activated carbon, the amount of recycle steam used, etc. also differs, but in general, 50% of the calorie supplied to the regeneration chamber is due to the drying of wet activated carbon. Since it is consumed, the degree of contributing to plasticity and reactivation, which is the most important factor in the regeneration process, is being manipulated under such limited conditions.

The inventors of the present invention first in the Korean Patent No. 6173 (Notice No. 78-624) the vertical reaction vessel with the activated carbon supply port on the center of the vertical furnace with the exhaust pipe equipped with the burner, the product fixed discharge outlet at the bottom Inserting the lower closed vertical tube having the exhaust pipe with the damper and the supply system into the center of the reaction vessel described above, and inclining the steep gradient from the angle of repose of the activated carbon to the inner circumferential surface of the reaction vessel and the outer circumferential surface of the vertical tube. The inclined lubrication plate forming the upper and lower stages of the reaction cylinder and the inclined lubrication plate of the vertical pipe are shifted up and down, and the ventilation holes are drilled on the above-mentioned cylinder wall of the reaction cylinder and the vertical wall of the vertical pipe. A regeneration device for the snowy activated carbon was provided.

The recycling apparatus according to the present invention receives the high temperature of the annular regeneration chamber disposed in the furnace by the outer cylinder wall while the activated activated carbon charged from the indoor head descends through the inner cylinder wall, and passes through the inner cylinder through-hole. For example, the reaction gas diffused into the reactor is configured to sequentially, dry, calcinate, and revive from the indoor head by contacting with the regenerative steam, and at the same time, the steam vapor and the desorbed adsorbate vapor released from the wet activated carbon are combined with the regenerative steam. The incineration of combustible materials is incinerated by diffusing them into the combustion zone in the furnace through the through holes installed in the outer wall and contacting the combustion gases of high temperature, and it is considered to prevent any harmful or odorous substances from being discharged to the outside of the system. .

However, the inventors of the present invention have examined the aspect of heat consumption in the axial direction of the regeneration chamber in the case of regenerating wet activated carbon using such a proposed apparatus, so that almost half of the heat supply is consumed in the drying process, resulting in thermal economic problems. It turned out. It is recognized that the main reason is that the wet activated carbon treated mainly has a water content close to 50%, so that it must be dried and supplied in the same area as the firing and reactivation process requiring a high temperature of 800 to 1,000 ° C.

In addition, there is no benefit in terms of equipment cost in this apparatus. In other words, during the regeneration process, firing and resurrection must be performed in the high temperature range, so the regeneration chamber must be composed of a heat-resistant material, but if it is dried in the same area, a regeneration chamber with a long passage is required. The heating furnace for transporting this also has to be large.

In view of the above, the present inventors take out the drying process of the wet activated carbon out of the furnace, and heat the hot air obtained by heat dissipation as a furnace combustion gas or by heat exchange with the furnace combustion gas to contact the wet activated carbon to evaporate most of the moisture, and The inner regeneration chamber was mainly fired and revived to increase the overall thermal efficiency and to reduce the equipment cost of the apparatus.

In particular, in the latter case, in the furnace, heat recovery is performed by exchanging combustion gas with air for heat recovery. In the case where the air is again used as combustion air for the furnace, drying is performed by directly contacting the wet activated carbon with the hot air. There is no concern for secondary pollution by desorption gas from the activated carbon to be treated, and it is very suitable as an apparatus for preventing pollution with excellent thermal efficiency.

That is, the present invention provides the wet activated carbon from the upper portion of the annular regeneration chamber between the inner cylinder and the outer cylinder formed by concentrically arranging the outer cylinder and the inner cylinder having a plurality of through-holes installed in the barrel wall in the furnace equipped with the burner. The reaction gas is supplied from the upper end or the lower end through the through-hole of the inner cylinder or the outer cylinder into the annular chamber, and the desorption gas from the wet activated carbon generated by bringing the wet activated carbon into close contact with the reaction gas is heated through the through-hole of the outer cylinder. In the regeneration apparatus of the wet activated carbon discharged into a furnace, the wet activated carbon is previously dried by the heat air obtained by heat-exhaust | heating the combustion exhaust gas from the heating furnace by heat dissipation or its exhaust gas, and is supplied to a regeneration chamber. It is to provide a regeneration device of wet activated carbon.

Hereinafter, the embodiment of the present invention will be described.

FIG. 1 shows an exemplary embodiment of the case where the sensible heat of the combustion gas is used as preheating of the combustion air in the heating furnace, and the wet activated carbon is dried as the resulting hot air. The wet activated carbon is supplied from the hopper 1 and is absorbed by the blower 4 during the transfer by the screw 3 in the dryer 2 made of the screw feeder, and the temperature is raised in the air heating unit 5. It is dried by direct contact with hot air.

Hot air is the sensible heat for evaporation of water, the evaporation of the moisture in the dryer (2) proceeds in the direction opposite to the movement direction of the wet activated carbon, the heating furnace discharged from the hot air discharge pipe (7) Is used as combustion air of the burner (8). Activated carbon dried in the dryer (2) is charged into a regeneration chamber (9) installed in a heating furnace, and is mainly fired and revived while the room is lowered by gravity. The regeneration chamber 9 is composed of an annular chamber composed of an inner cylinder 10 for supplying a reactive gas, for example, a regeneration steam, and an outer cylinder 11 for receiving a regeneration heat source. Each through-wall is provided with a plurality of through-holes 13, and the inner cylinder is directed outwardly and the outer cylinder is inwardly directed so that the inclined lubrication plates 14 and 15 are directed downward from the upper positions of the respective through-holes. It is installed inclined slowly. The activated carbon dried in the dryer 2 is distributed and supplied by the distributor 16 installed in the upper portion of the annular chamber 9, and the regenerated steam nozzle 17 is provided in the lower portion of the inner cylinder 10 while moving down the room by gravity. And the adsorbent material is discharged while being in contact with the regeneration water vapor introduced from the inner cylinder wall through-hole 12 and subjected to the high heat supplied from the outer wall cylinder 11.

The adsorbed material vapor is discharged from the outer cylinder wall through hole 13 into the heating furnace together with the regenerated water vapor, and comes into contact with the high temperature combustion gas in the furnace, and is combusted together with the combustion gas in the air heating unit 5 through the flue 18. It is released after donating sensible heat with air. Meanwhile, the regenerated activated carbon is discharged by the table feeder discharge device 19.

Denoted at 20 is a feed pump for a furnace. 2 shows an embodiment of the present invention when the wet activated carbon is thermally dried as combustion gas of a heating furnace.

In FIG. 2, the wet activated carbon is radiated by the hot combustion gas from the heating furnace 7 in the jacket-type drier 2 ', except that the wet activated carbon enters the regeneration chamber 9 together with the vapor discharged at that time. Playback is carried out as in the case of.

FIG. 3 shows a case in which the wet activated carbon is easily and DC-dried by hot air obtained by heat exchange with flue gas from a heating furnace in the drying means 21 provided between the screw feeder 3 and the regeneration chamber 9. Another embodiment of the present invention is shown.

In the figure, most of the moisture accompanying the wet activated carbon is removed by the screw feeder 3 and then enters the drying means 21, where the activated carbon is in direct contact with the hot air obtained by heat exchange with flue gas from the heating furnace 7. Thereby drying. The drying means 21 is formed of a dryer tube 23 connected to the top of the outer cylinder wall 11 of the hot air distributor 22 and a jacket 24 concentrically provided to them.

Both walls of the hot air distributor 22 and the dryer tubing 23 each have a number of small through holes for passing through the hot air. The dehydrated activated carbon supplied via the screw feeder 3 in this way is introduced via the hot air distributor 22 while descending the annular space between the hot air distributor 22 and the dryer tube 23. It dries in contact with hot air. The hot air containing the water vapor liberated from the wet activated carbon is then collected into the jacket combustion chamber 25 and discharged from the discharge port 27. Further, the apparatus is similar to other components, for example, the regeneration chamber 9, the heating furnace 7, the regeneration activated carbon discharge mechanism, and the like, in the case of the above-described example apparatus of the present invention. Furthermore, in the present invention, the combustion gas of the heating furnace can be directly fed into the dryer, and can be dried by directly contacting the wet activated carbon.

In this case, it is preferable that the raw activated carbon does not contain odorous or harmful components including pollution problems.

In the above apparatus, an inner cylinder and an outer cylinder provided with an inclined lubrication plate were used so that mixing and contact were good. However, in the present invention, an inner cylinder and an outer cylinder without an inclined lubrication plate can be used. In addition, although the product of the table feeder type was used as the product discharge device, the product metering discharger and the like are known and may be provided with a simple discharge mechanism. The inner and outer cylinders of the jangsaengsil are preferably made of heat transferable heat resistant material.

Water vapor is most suitable as the reaction gas, but other gases, for example, nitrogen gas can also be used. The reaction gas supply system may be used in combination with the combustion air supply system supplied to the burner. Moreover, the burner can be installed at any place of the heating furnace, but it is preferable to dispose the combustion gas in the furnace and to face the heating furnace in a tangential direction.

In addition, in order to completely regenerate the activated carbon and burn the desorption gas, for example, as the secondary combustion air, the amount of primary combustion air to be sent to the regeneration chamber or fed to the burner as shown in FIG. It is good to make excess.

EXAMPLE

Two types of wet activated carbon (containing dry activated carbon weight and almost the same amount of water) discharged from water treatment prints in petroleum refining plants, each having a treatment capacity of 1 ton / day and 3 ton / day, respectively. The regeneration was performed by the apparatus. That is, in the apparatus according to the present invention shown in FIG. 1, the air is blown by the blower 4, and heat exchanged with the heat waste gas generated from the heating furnace 7 in the air heating unit 5, and the heat is recovered. The hot air thus obtained is supplied to the drier 2 and brought into direct contact with the wet activated carbon to dry the activated carbon. Next, the wet air generated from the dryer 2 was introduced into the heating furnace 7 as air for combustion, so that the apparatus of the present invention was operated with respect to the processing capacity of 1 ton / day and 3 ton / day, respectively.

On the other hand, Korean Patent No. 6173 (Notice No. 78-624) as an example of an apparatus which does not apply the improvement according to the present invention (that is, does not have the air heater 5 and the dryer 2 in the present invention). For the apparatus described in the above, comparative experiments were performed at throughputs of 1 ton / day and 3 ton / day, respectively.

The results of these cases are shown in the table below.

Recycling Container T / C 1.0 3.0

Dryer N㎥ None Yes No Yes

Air Need N㎥ / Hr 400 270 1,100 730

Required Fuel kg / Hr 27.75 18.68 76.50 50.48

Air preheating outlet air temperature ℃-598-630

Furnace Inlet Air Temperature ℃ 20 300 20 300

Furnace temperature ℃ 1,000 Same as left Same as left Same as left

Exhaust gas temperature ℃ 800 Same as left Same as left Same as left

Atmospheric emission gas temperature ℃ 800 297 800 264

Thermal Efficiency% 20.6 30.6 22.4 34.0

Fuel: Kerosene LHV = 10,400kcal / kg

Excess air volume: 30%

Required air volume: 1,442N㎥ / kg Fuel = 18.67kg / kg Fuel

Exhaust gas volume: 15.55N㎥ / kg Fuel

Emission gas molecular weight: 28.7

Claims (1)

The outer cylinder and inner cylinder with several through-holes installed in the furnace wall are installed concentrically, and the wet activated carbon is also discharged from the top or bottom of the inner cylinder between the formed inner cylinder and the outer cylinder. Wet to supply the reaction gas into the annular chamber through the through-hole of the inner cylinder and discharge the desorption gas from the wet activated carbon generated by bringing the wet activated carbon into close contact with the reaction gas into the furnace through the through-hole of the outer cylinder. In the regeneration apparatus of activated charcoal, the wet activated carbon is previously dried by hot air obtained by heat from the heat discharged by the combustion exhaust gas from the heating furnace or by heat exchange with the exhaust gas, and then supplied to the regeneration chamber. Regeneration device of wet activated carbon.

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