KR20050013399A - Activated carbon repreduction system for volatility organic compound exclusion - Google Patents

Abstract

PURPOSE: To provide an activated carbon regeneration system for volatile organic compound removal which excludes risk factors such as a fire by adopting a sprinkler means automatically controlled and substantially increases regeneration efficiency of activated carbon by effectively removing volatile organic compounds in activated carbon within a short time. CONSTITUTION: The activated carbon regeneration system for volatile organic compound removal comprises a chamber(12) having a certain volume which is connected to an exhaust line of a facility for exhausting an exhaust gas containing volatile organic compounds in such a way that the chamber is selectively sealed by an entrance side damper(10) and an exit side damper(11), and in which several stages of activated carbon are contained; a circulation line(13) connected to an upper portion of one side of the chamber and a lower portion of the other side of the chamber so that air in the chamber is circulated through the circulation line, and a fan for forcibly circulating the air through the circulation line; a heat exchanger(15) installed at one side of the circulation line to heat exchange the air circulated, and a heater(16) for supplying a heat source to the heat exchanger; an air inlet(18) opened and closed by respective solenoid valves(17a,17b) to flow an external air into the chamber, and a volatile organic compound discharge port(19) connected to an incinerator to discharge volatile organic compounds contained in air inside the circulation line; sensors respectively installed in the solenoid valves, in the activated carbon inside the chamber and on the circulation line; and a microcomputer connected with the dampers, the fan and the heater to control them.

Description

Activated carbon repreduction system for volatility organic compound exclusion}

The present invention relates to an apparatus for regenerating activated carbon by removing volatile organic compounds adsorbed in activated carbon.

In particular, by providing an activated carbon regeneration device of a tropical flow type that passes the activated carbon while heating the air with a heat source such as a burner or an electric heater and circulating the heated air at this time, the size of the device can be drastically reduced, and the fire The present invention relates to an activated carbon regeneration device for removing volatile organic compounds, which can eliminate the risk factors, and above all, to improve the activated carbon regeneration efficiency such as effectively removing volatile organic compounds in activated carbon within a short time.

In general, Volatility Organic Compound (VOC) is a carbon compound except carbon monoxide, carbon dioxide, carbonic acid, metallic carbonate and ammonium. It is an organic compound that raises the smog phenomenon.

Representative materials include 318 kinds of photochemical reactions such as benzene, toluene, propane, butane, nucleic acid, etc., which are larger than ethane, and petrochemical products and organic solvents having a true vapor pressure of 1.5 Pais or more. .

VOC is not only widely used as a solvent in industry, but also contained in organic gas emitted from chemical and pharmaceutical factories, automobile coating booths and plastic drying processes, and it is surrounded by low-boiling liquid fuels, paraffin, olefins and aromatic compounds. Almost all hydrocarbons used in

These VOCs are not only toxic chemicals, but also the entire structure of photochemical oxides, the stratospheric ozone depleting substances, and the substances affecting global warming. Therefore, the removal of VOCs from organic gases containing VOCs and released into the atmosphere is an environmental protection. Is important.

As mentioned above, the apparatus for removing VOC is essentially employed in chemical and pharmaceutical related factories, automobile coating booths, plastic handling factories, and the like.

5 is a schematic view showing an example of an automobile paint booth to which a general VOC filtering device is applied, and FIG. 6 is a perspective view showing an example of a VOC filtering device used at this time.

As shown, the VOC filtration device 100 is installed on the side of the blower 120 of the coating booth 110 and has a structure in which the activated carbon 150 is filled in the enclosure 140 covered by the reticular member 130. .

Here, the activated carbon is prepared by treating wood, lignite, and soothed water with a chemical agent such as zinc chloride or phosphoric acid as an activator, and drying or activating charcoal with water vapor to produce a horizontal or granular state.

Such activated carbon mainly absorbs gas and moisture as an adsorbent, or else has a function of recovering solvent, purifying or decolorizing gas.

The process of filtering the VOC in the exhaust gas by the existing VOC filtration device is as follows.

When the exhaust gas is discharged through the exhaust line of the air blower 120 and passes through the activated carbon 150 of the VOC filtration apparatus 100, VOC and moisture in the exhaust gas are adsorbed onto the activated carbon 150 and filtered.

However, in the existing VOC filtration apparatus as described above, the VOC or moisture adsorbed on the activated carbon cannot be removed by itself, and thus, the filtration function of the activated carbon is lost after a certain filtration time. There is a hassle and inefficiency that needs to be exchanged.

Moreover, the existing VOC filtration device filters VOC and moisture, but cannot remove VOCs in recent years, and thus has limitations in terms of fundamental environmental pollution prevention.

In view of the above, Korean Patent No. 343804 proposes a technique for semi-permanently using activated carbon by regenerating activated carbon after a certain period of time.

The above patented technology is a technology that burns and removes VOC in activated carbon through heating of heater by embedding heater means directly in activated carbon. This technology is very complicated and has long regeneration time, which limits the use time of paint booth. In particular, since the heater, which is a heat source, is in direct contact with activated carbon, there is a problem of always causing a risk of ignition due to a partial temperature rise.

In addition, since the thermal conductivity is extremely difficult as the thermal insulation material is very excellent activated carbon itself, even if heated for a long time there is a disadvantage that the temperature is not evenly conducted throughout the activated carbon.

These shortcomings affect the VOC regeneration efficiency, and eventually the heaters are evenly arranged in multiple bundles, which increases the size of the device and does not have structural difficulties that are less than expected.

Accordingly, the present invention has been made in view of the above, and the air is heated by using a heat source such as a burner or an electric heater in a manner of regenerating activated carbon by extracting VOC from existing activated carbon, and the heated air is By adopting a tropical flow system that continuously circulates via diesel, it is possible to increase the regeneration efficiency while simplifying the size of the device, and in particular, it is possible to eliminate risk factors such as fire by adopting an automatically controlled sprinkler means. It is an object of the present invention to provide an activated carbon regeneration device for removing volatile organic compounds that can effectively remove volatile organic compounds in activated carbon within a time, thereby significantly increasing the activated carbon regeneration efficiency.

The present invention for achieving the above object constitutes a circulation line including a space in which activated carbon is disposed, and a tropical flow system that is configured to extract VOC in activated carbon by activating activated carbon at a high temperature while circulating hot air through the circulation line. Characterized in that consisting of the playback device.

In addition, the regeneration apparatus of the tropical flow type is connected to the exhaust line of the facility for discharging the exhaust gas containing the VOC can be selectively sealed by the inlet side damper and the outlet side damper, there are several stages of activated carbon inside A chamber having a constant volume for accommodating the air, a circulation line for circulating air in the chamber while communicating with an upper portion and an opposite lower portion of the chamber, and a fan for forced circulation, and heat exchange of air circulated while being installed at one side of the circulation line A heat exchanger and a heater for supplying a heat source, an air inlet for opening and closing by each solenoid valve, and a VOC outlet connected to an incinerator side for discharge of VOC in the air in a circulation line; Each of the solenoid valves, the respective sensors, dampers, fans installed in the activated carbon in the chamber and on the circulation line And a microcomputer for controlling the heater and the like in association.

In addition, it is characterized in that it further comprises a sprinkler of a plurality of lines are installed in the chamber attached to each stage of the activated carbon and controlled by a microcomputer by the signal of the sensor to spray water when the activated carbon is overheated.

In addition, the chamber is configured to induce the flow of the exhaust gas from the upper side to the lower side with the upper side where the inlet side damper is installed as the inlet side and the outlet side damper which extends from the lower side and is installed at a constant height as the discharge side. It is characterized by.

In addition, the microcomputer is configured to control the ON / OFF operation of the heater within the range of the temperature value 140 ~ 160 ℃ input from the sensor in the activated carbon or the temperature value 140 ~ 180 ℃ input from the sensor on the circulation line. do.

In addition, the heater is characterized in that one of the burner or electric heater.

1 is a plan view showing the overall configuration of the activated carbon recycling apparatus according to the present invention

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

3 is a cross-sectional view taken along the line B-B of FIG.

4 is a cross-sectional view taken along the line B-B of Figure 1 showing the operating state of the activated carbon recycling apparatus according to the present invention;

5 is a schematic view showing an example of an automobile paint booth applying a general VOC filtration device

6 is a perspective view showing an example of a VOC filtration device applied to FIG.

<Explanation of symbols for main parts of drawing>

10: inlet damper 11: outlet damper

12 chamber 13 circulation line

14 fan 15 heat exchanger

16 heater 17a, 17b solenoid valve

18: air inlet 19: VOC outlet

20a, 20b: sensor 22: sprinkler

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the activated carbon regeneration apparatus according to the present invention.

1 is a plan view showing the overall configuration of the activated carbon regeneration apparatus according to the present invention, Figures 2 and 3 is a cross-sectional view taken along line A-A and B-B of FIG.

1 to 3, the chamber 12 for guiding the flow of the exhaust gas from the top to the bottom of the exhaust fan 120 for discharging the exhaust gas of the facility, such as an automobile booth, is installed, the chamber 12 The inlet side damper 10 and the outlet side damper 11 are respectively installed at a constant height extending from the upper and lower portions of the chamber, and the activated carbon 150 for adsorbing VOCs in the exhaust gas is provided in the chamber 12. Is placed.

Accordingly, the exhaust gas during the operation of the facility is introduced into the chamber 12 and passes through the activated carbon 150 to adsorb the VOC contained therein. Thus, the harmless exhaust gas from which the VOC is removed is discharged to the blower 120 side. Through the outside.

As described above, the respective dampers 10 and 11 remain open while VOC adsorption is performed in the exhaust gas, and the open state of the dampers 10 and 11 is controlled by a microcomputer (not shown). .

In order to regenerate activated carbon, the present invention provides a regeneration apparatus of a tropical flow method.

To this end, a circulation line 13 is provided which is connected through one upper portion and the other lower portion of the chamber 12 to form a constant circulation section.

The circulation line 13 is a passage for circulating air in the chamber 12, and is provided with a fan 14 for forced circulation of air and a heat exchanger 15 and a heater 16 for providing hot air. One side of the circulation line 13 is connected to the VOC outlet 19 for sending the VOC extracted from the activated carbon to the incinerator side.

At this time, the solenoid valve 17b is installed in the VOC outlet 19, and VOC can be selectively sent to the incinerator according to the operation thereof.

Here, the heater 16 is preferably a burner or heat transfer heater, but may include any means of combustion or heating that can provide a heat source to the heat exchanger side.

In addition, since the interior of the chamber 12 is in a sealed state close to a vacuum when regenerating activated carbon for VOC extraction, an air inlet 18 capable of partially introducing external air to one side of the chamber 12 for smooth flow at this time. ) Is connected.

At this time, the solenoid valve 17a is also installed in the air inlet 18 so that it can be opened only when the activated carbon is regenerated and air can be introduced therein.

In particular, several lines of sprinkler 22 for preventing the risk of fire due to overheating of activated carbon during activated carbon regeneration and for supplying water to the activated carbon to suppress friction and generation of static electricity between air circulated and activated carbon are provided. Is provided.

The sprinkler 22 is disposed horizontally across the inside of the chamber 12, and is capable of supplying water to the activated carbon side from above each stage where the activated carbon 150 is disposed.

At this time, the sprinkler 22 is controlled by a microcomputer to selectively supply water according to the environment in the chamber 12.

In addition, two sensors are provided as a sensing means for suppressing overheating of activated carbon and excessive temperature rise of circulating air during activated carbon regeneration.

That is, one sensor 20a is installed inside the activated carbon 150 to detect that the temperature of the activated carbon is overheated more than necessary, and on one side of the circulation line 13, for example, of the fan 14. Another sensor 20b is installed just in front of the sensor to sense the air temperature circulated and then be used to control the operation of the heater 16.

Therefore, the operating state of the activated carbon regeneration device of the present invention configured as described above is as follows.

As shown in FIG. 4, the VOC contained in the exhaust gas in a normal operation state of a facility such as an automobile booth is adsorbed and removed by activated carbon in a chamber through which the exhaust gas passes.

After operation of the plant, it is switched to the unit for the regeneration of activated carbon.

First, the inlet side damper 10 is closed to block the chamber 12 from the installation side, and the outlet side damper 11 is subsequently closed to isolate the internal space of the chamber 12 from preventing air from being discharged to the outside.

At this time, the solenoid valve 17b is turned off to block the VOC outlet 19 on the circulation line 13 connected to the incinerator side.

This actually creates a closed circulation line 13 leading to the chamber 12-fan 14-heat exchanger 15 centered on the activated carbon, the circulation line 13 being in reverse with the direction of tropical flow. Fan 14 in this direction acts to allow for continuous circulation of air.

At this time, the heater 16 is operated so that the air is changed to hot air through heat exchange with the heat exchanger 15, and if the fan 14 is operated continuously, the hot air is forced to circulate while activating the high temperature of the activated carbon in the chamber 12. To promote.

The air circulated increases the temperature while passing through the activated carbon, and the activated carbon gradually discharges the VOC at a high temperature of 70 ° C. or higher, and the VOC concentration in the air gradually increases.

This temperature is raised to a temperature range of about 140 ~ 160 ℃, by detecting it from the sensor 20a installed inside the activated carbon to control the operation of the heater 16 intermittently, thereby maintaining the temperature of the activated carbon at the optimum activation temperature Therefore, it is possible to increase the VOC extraction efficiency.

The sensor 20b installed in front of the fan 14 of the circulation line 13 detects this so that the temperature of the circulation air does not exceed 140 to 180 ° C., and then provides a detection signal to the microcomputer to provide a heater ( By controlling 16), it is possible to solve the problem that activated carbon is ignited due to instantaneous high temperature.

When the activated carbon regeneration operation as described above, the sprinkler 22 installed inside the chamber 12 is intermittently intermittently to suppress the friction of activated carbon and the generation of static electricity due to the circulation of air from the time when the temperature of the activated carbon exceeds 70 ° C. By activating, the heated air can maintain high humidity.

Activated carbon can generate mutual vibration due to the flow of air, and static electricity is easily generated by the vibration, and in some cases, the electrostatic and iron compounds contained in the activated carbon can act as a catalyst and cause a ignition even at low temperatures. Therefore, increasing the humidity in the air at this time can easily cancel the static electricity and eliminate the cause of the ignition. This means that the device can be operated stably.

When the VOC in the activated carbon is removed by the above process, the VOC is combusted by exhausting the air circulated to the next step (air containing a high VOC concentration).

That is, the solenoid valve 17b in the VOC outlet 19 is opened to communicate with the incinerator side.

The incinerator at this time operates the incinerator burner before the solenoid valve 17b is opened so that the combustion chamber of the incinerator is sufficiently heated.

Conventional incinerators use carbon electrodes to create high temperatures of 1,000 ° C or higher. In order to protect the heat source, the general method is to seal the fire block and the outside with a steel case and install electrodes at the center. It is necessary to adjust the voltage applied from time to time gradually.

The burner type heat generating device employed in the present invention has a feature of simple installation and low cost since it generates high temperature through a fire brick or a special metal mesh in a heated flame without the above limitation.

Since the air circulated in a completely closed state during VOC discharge should be introduced into the incinerator, the outside air filling the internal space should be introduced, so that the outside air can be opened by opening the solenoid valve 17a of the air inlet 18.

When activated carbon catches fire in the course of operation as described above, the two sensors 20a and 20b detect this and continuously operate the sprinkler 22, thereby extinguishing the fire.

Activated charcoal absorbs water very well, so it is easy to extinguish fire and burns very slowly even if it is ignited. Thus, even if sensors 20a and 20b detect late, it can prevent damage to the device due to fire. .

A series of processes for regenerating activated carbon is orderly controlled by a microcomputer and automatically performs an interlock (stop operation) to prevent the booth of the facility from operating until the operation of the device is completed.

When all the processes for the regeneration of the activated carbon are completed, the inlet side damper 10 and the outlet side damper 11 which are closed are opened and reduced to the original function of the painting booth.

As described above, the activated carbon regeneration device provided in the present invention has the following advantages.

1) Because it is a tropical flow method that circulates activated carbon by heating air with burner or electric heater, it can transmit heat to every corner of activated carbon in a balanced way, and the device is extremely simple and can regenerate activated carbon in a short time. There is an advantage.

2) Sprinklers intermittently during heating to high temperature to eliminate the risk of fire due to the risk of fire at low temperature due to dry air in winter and catalyst material inside activated carbon and static electricity due to mutual contact or collision of activated carbon grains. By operating the, there is an advantage that can completely prevent the risk of fire by supplementing the humidity in the air.

The application of this sprinkler is to spray the activated carbon continuously in the event of a fire, it is possible to play a role of extinguishing at the same time.

Claims (5)

Comprising a circulating line comprising a space in which the activated carbon is disposed, and activating the activated carbon at a high temperature while circulating the hot air to the circulation line to extract the VOC in the activated carbon, characterized in that consisting of a regeneration apparatus of a tropical flow Activated carbon regeneration device for removing volatile organic compounds. According to claim 1, wherein the regeneration apparatus of the tropical flow type is connected to the exhaust line of the facility for discharging the exhaust gas containing the VOC is selectively selected by the inlet side damper (10) and the outlet side damper (11) A chamber 12 having a constant volume, which may be sealed and receive a plurality of stages of activated carbon therein, and a circulation line 13 which circulates air in the chamber 12 while communicating with an upper portion and an opposite lower portion of the chamber 12. And a fan 14 for forced circulation, a heat exchanger 15 for heat exchange of air circulated while being installed on one side of the circulation line 13, a heater 16 for supply of a heat source, and each solenoid Opening and closing by valves 17a and 17b, the air inlet 18 for the inflow of external air into the chamber 12 and the VOC outlet 19 connected to the incinerator side for the discharge of VOC in the air in the circulation line 13 And each of the solenoid valves 17a and 17b and the chamfer Micro to control each sensor 20a, 20b, damper 10, 11, fan 14, heater 16, etc. installed in the activated carbon in the burr 12 and the circulation line 13, etc. Activated carbon regeneration device for removing volatile organic compounds, characterized by comprising a computer. The sprinkler of claim 2, which is installed in the chamber 12 and assigned to each stage of activated carbon and controlled by a microcomputer by a signal of the sensor 20a to inject water when the activated carbon is overheated. Activated carbon regeneration apparatus for removing volatile organic compounds, further comprising a. 4. The chamber (12) according to claim 2 or 3, wherein the chamber (12) discharges a side having an outlet side damper (11) installed at a constant height extending from a lower portion of the upper side where the inlet side damper (10) is installed. Activated carbon regeneration device for removing volatile organic compounds, characterized in that the side to the side to induce the flow of exhaust gas from the top to the bottom. 3. The heater according to claim 2, wherein the microcomputer has a heater within a range of a temperature value 140 to 160 deg. C input from a sensor 20a in activated carbon or a temperature value 140 to 180 deg. C input from a sensor 20b on a circulation line 18. An activated carbon regeneration device for removing volatile organic compounds, characterized by controlling the ON / OFF operation of (16).