JP2001029736A - Apparatus and method for deodorizing treatment of exhaust gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively perform the deodorizing treatment of exhaust gas even if moisture or an oil component is contained in the exhaust gas and to prevent the damage of the adsorbing capacity of malodor molecules caused by the moisture or oil component. SOLUTION: An oil component and moisture in the exhaust gas discharged from a exhaust gas generating source 1 such as a garbage dryer or the like are removed by a condenser unit 2 to be discharged as condensed water 21 from a drain piping A14. The exhaust gas 8 from which the oil component and moisture are removed is supplied to an adsorbing tower 3 packed with an adsorbent 7 partially containing ceramic and malodor molecules are adsorbed and removed from the exhaust gas 8 by the adsorbent 7. The exhaust gas 9 thus deodorized is discharged to the open air as odorless exhaust gas 6 by a blower 4. The condensed water formed in the adsorbing tower 3 is accumulated on an inclined plate 16 to be discharged as dew condensation water 17. Therefore, the deterioration of a malodor level and the lowering of deodorizing efficiency are prevented even in the adsorbing tower 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas deodorizing apparatus and an exhaust gas deodorizing method for effectively deodorizing exhaust gas generated from household waste such as garbage and industrial waste.

[0002]

2. Description of the Related Art Conventionally, exhaust gas deodorizing methods for deodorizing such exhaust gas include a method of directly burning the exhaust gas at a high temperature of 600 ° C. or higher, a method of burning the exhaust gas at a temperature of 400 ° C. or lower using a catalyst, and a method of using a photocatalyst. And drying at room temperature, and ozone and UV at a temperature around 25 to 100 ° C.
Various deodorizing methods such as a method of exposing to light (ultraviolet light) and a method of using an adsorbent at room temperature are known. Among these methods, the deodorizing treatment method using an adsorbent at normal temperature is
There are advantages in that the configuration of the apparatus is simpler than in other methods and can be implemented relatively inexpensively. Furthermore, various adsorbents are commercially available according to various target substances to be deodorized and removed, and there is an advantage that these adsorbents can be obtained relatively inexpensively and easily. In addition, utility model registration No. 300
No. 7,768 discloses a gas treatment apparatus that directly sucks and introduces exhaust gas from an engine or the like through an exhaust port by suction attachment, performs a filtration process, an adsorption process, and the like, and deodorizes the gas.

[0003]

However, the deodorizing treatment technique using the adsorbent or the filtration / adsorption treatment apparatus described above requires the adsorbent or the filtration / adsorption treatment apparatus when the exhaust gas contains moisture. Since water is adsorbed preferentially over malodorous substances, the adsorbing ability and the filtering ability may deteriorate in a short time. Also, if mist-like oil is contained in the exhaust gas, the surface of the adsorbent and the filtration / adsorption treatment device will be covered with this oil, and similarly, the adsorption capacity and the filtration capacity will deteriorate in a short time. There are problems such as getting lost.

[0004] The present invention has been made in view of such circumstances, and an object of the present invention is to effectively perform a deodorizing treatment even if moisture or oil is contained in exhaust gas, and to perform deodorization treatment with moisture or oil. An object of the present invention is to provide an exhaust gas deodorizing treatment apparatus and an exhaust gas deodorizing method that do not impair the adsorption capacity of odor molecules.

[0005]

The exhaust gas deodorizing apparatus according to the present invention is provided with a removing means for removing oil and moisture in the exhaust gas generated from the substance, and an adsorbent containing at least a part of ceramic is provided at a subsequent stage. Is provided with an adsorbing means filled with water and further provided with an exhaust means for exhausting the exhaust gas deodorized by the adsorbing means, so that the exhaust gas containing water and / or oil can be efficiently deodorized. It is characterized by being able to. That is, the exhaust gas generated by the exhaust gas source passes through a condenser unit for removing oil and water, and then passes through an adsorption tower installed at the subsequent stage filled with an adsorbent containing at least a part of ceramic. Then, the exhaust gas is discharged to the outside by a blower, so that the exhaust gas is efficiently deodorized.

That is, an exhaust gas deodorizing apparatus according to claim 1 is an exhaust gas deodorizing apparatus for deodorizing exhaust gas generated from a substance, the removing means for removing oil and moisture contained in exhaust gas discharged from an exhaust gas generating source. The adsorbent is provided at the subsequent stage of the removing means and is filled with an adsorbent containing at least a part of ceramics, and adsorbs odor molecules of the exhaust gas from which oil and moisture have been removed, and deodorized by the adsorbing means. It is characterized by comprising exhaust means for exhausting exhaust gas to the outside air, and ventilation means connecting the removing means, the adsorption means and the exhaust means and communicating with the outside air.

[0007] The exhaust gas deodorizing treatment device according to claim 2 is the exhaust gas deodorizing treatment device according to claim 1, wherein
Heating means for heating the adsorption means, bypass means for reducing the exhaust gas from the exhaust means to the exhaust gas from the ventilation means leading to the outside air, and flow path switching for selectively switching the flow path between the ventilation means and the bypass means leading to the outside air Means. That is, the second aspect of the present invention is to effectively regenerate the adsorption means by forcibly evaporating and cleaning the water adhering and adsorbing to the adsorption means by the heating means. In addition, since the steam gas generated during heating of the adsorbing means is the garbage water, if this is discharged to the outside air, a bad smell will be generated. During the heating, the flow path switching means is switched to the bypass means side to be opened. The steam gas is returned to the exhaust gas generation source without being discharged out of the system.

[0008] The exhaust gas deodorizing apparatus according to claim 3 is
3. The exhaust gas deodorizing treatment device according to claim 1, wherein the removing means is a mist separator for removing an oil component in the exhaust gas, and an air-cooled or water-cooled condenser for removing moisture in the exhaust gas. And characterized in that: According to a fourth aspect of the present invention, there is provided the exhaust gas deodorizing apparatus according to any one of the first to third aspects, wherein the removing means discharges oil and water removed from the exhaust gas. For discharging the condensed water.

Further, in the exhaust gas deodorizing treatment device according to the present invention, in the exhaust gas deodorizing treatment device according to the present invention, the condensed water discharging means may be connected to the removing means by the external pressure without the condensed water flowing outside. A water seal is provided to prevent a part of the oil or water from being contained again in the exhaust gas after a part of the exhaust gas has passed through the removal means and to prevent the inflow of outside air. It is characterized by the following.

The exhaust gas deodorizing apparatus according to claim 6 is
The exhaust gas deodorizing apparatus according to any one of claims 1 to 5, wherein the adsorbing means has an inclined plate for removing dew / condensed water generated in the adsorbing means at a bottom portion or a lowermost portion of the side surface. A condensed water / condensed water discharging means for discharging the condensed water / condensed water accumulated on the inclined plate is provided. The exhaust gas deodorizing apparatus according to claim 7 is the exhaust gas deodorizing apparatus according to claim 6, wherein the dew / condensed water discharging means is an adsorbing means that the dew / condensed water does not flow to the outside due to the external pressure. Equipped with a water seal to prevent that part of the water stays in or exhaust gas after passing through the adsorption means, and that a part of dew / condensate water is contained again, and to prevent inflow of outside air. It is characterized by having.

The exhaust gas deodorizing apparatus according to claim 8 is
The exhaust gas deodorizing treatment device according to any one of claims 1 to 7, wherein the adsorbent filled in the adsorption means is one in which a ceramic adsorbent and an activated carbon adsorbent are charged in series, or a ceramic adsorbent. The adsorbent and the activated carbon adsorbent are mixed ones. In the exhaust gas deodorizing treatment device according to the ninth aspect, in the exhaust gas deodorizing treatment device according to the eighth aspect, when the ceramic adsorbent and the activated carbon adsorbent are charged in series, counting from the inflow side of the exhaust gas. The first layer uses a ceramic or activated carbon having a large apparent porosity, the second layer uses an impregnated activated carbon having a good adsorption of a basic gas, and the third layer has a good adsorption of an acidic gas and a neutral gas. Is used.
Furthermore, the exhaust gas deodorizing treatment device according to claim 10 is:
The exhaust gas deodorizing apparatus according to any one of claims 1 to 9, wherein an outside air intake port is provided between the exhaust gas generation source and the removing means.

An exhaust gas deodorizing method according to claim 11 is a method for deodorizing an exhaust gas generated from a substance, comprising the steps of: removing oil and moisture contained in exhaust gas discharged from an exhaust gas generating source; Exhaust gas deodorizing treatment, comprising: a step of adsorbing odor molecules of exhaust gas from which oil and water have been removed by an adsorbent containing at least a part of ceramics; and a step of exhausting deodorized exhaust gas to the outside air. Is the way.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram of an exhaust gas deodorizing treatment apparatus according to one embodiment of the present invention. This exhaust gas deodorizing apparatus is an apparatus for deodorizing an exhaust gas 5 generated in an exhaust gas generation source 1 such as a garbage dryer, and a condenser unit 2 for removing oil and moisture in the exhaust gas 5, and an oil and moisture removing apparatus. An adsorption tower 3 for adsorbing the odor molecules of the exhaust gas 8, a blower 4 for exhausting the deodorized exhaust gas 9 to the outside, and pipes for connecting these, exhausting to the outside, or draining the drain. It has.

The condenser unit 2 comprises a mist separator for removing oil in the exhaust gas 2 and an air-cooled or water-cooled condenser for removing moisture in the exhaust gas. The adsorption tower 3 is filled with an adsorbent 7 containing at least a part of ceramic. As an example of the filling method of the adsorbent 7, there is a method of charging the ceramic adsorbent and the activated carbon adsorbent in series. Another example is
There is a method of filling an adsorbent manufactured by mixing ceramic and activated carbon. Further, the blower 4 only needs to be capable of overcoming the pressure loss of the condenser unit 2 and the adsorption tower 3 for a predetermined gas flow rate and discharging the exhaust gas 6 to the outside of the apparatus.

Next, the operation of the exhaust gas deodorizing apparatus of this embodiment will be described with reference to FIG. That is, a description will be given of an exhaust gas generation source 1 in which the amount of exhaust gas 5 generated during the processing of garbage when the garbage dryer is used is 20 m ³ / min or less. Although not shown, an outside air intake called a baffler may be provided between the exhaust gas generation source (garbage dryer) 1 and the condenser unit 2. This lowers the temperature of the exhaust gas 5 and causes the adsorption tower 3
In order to increase the adsorption capacity of the adsorbent 7 filled in the inside, the air circulation in the exhaust gas generation source (garbage dryer) 1 is efficiently performed, and the exhaust gas generation source (raw Even when gas is used as the heat source of the garbage dryer 1, it is possible to prevent poor combustion, for example, for the following reasons. In particular, in the case of, the outside air is taken in even when the blower 4 is stopped by any chance or when the interlayer of the adsorbent 7 in the adsorption tower 3 is attached with dust or the like, that is, even when the exhaust resistance is high, it is safe. is there.

The temperature of the exhaust gas 5 depends on the presence or absence of the buffer, and also depends on the garbage processing elapsed time and the outside air temperature.
On the other hand, when a baffler is provided, the temperature is usually 20 to 60 ° C. immediately after that, although it depends on the amount of outside air taken in. Further, the exhaust gas 5 contains a large amount of oil and water in the garbage. In particular, regarding the water content, even immediately after the buffer is provided, it is almost 30 to 3 hours after the start of the garbage treatment. The relative humidity is 100%.

Next, the exhaust gas 5 is passed through the condenser unit 2 to remove oil and moisture in the gas. This is performed in order to sufficiently exhibit the adsorbing capacity of the adsorbent 7 in the adsorption tower 3 provided in the subsequent stage. If a film of oil is formed on the surface of the adsorbent 7 by the oil in the exhaust gas, the adsorption capacity is deteriorated. If moisture is contained in the exhaust gas, the adsorbent 7 adsorbs water with a higher priority than malodorous substances, so that the adsorbing ability also deteriorates. The condenser unit 2 includes a mist separator for removing oil in exhaust gas and an air-cooled or water-cooled condenser for removing moisture in exhaust gas, which are connected in series. Normally, in order to prevent contamination due to oil content in the condenser, it is desirable to provide a mist separator in the first stage and a condenser in the second stage. The material of the mist separator is desirably a heat-resistant material such as stainless steel in consideration of the exhaust gas temperature described above. The condenser can be either air-cooled or water-cooled, but the gas cooling capacity is
It is desirable to have the ability to cool so that the gas temperature difference between the gas and the exhaust gas 8 becomes 5 ° C. or more.

The oil separated from the exhaust gas 5 by the mist separator and the moisture separated from the exhaust gas 5 by the condenser pass through a drain pipe A14 provided with a water seal A10 to the outside as condensed water 21. Is discharged.
The condensed water 21 performs recovery or performs drainage treatment. In the wastewater treatment, a process for clearing the wastewater standards defined by laws such as BOD and COD is performed. In this case, the water sealing A10 is such that the condensed water 21 partially stays in the condenser unit 2 without flowing to the outside or a part of the oil and water is contained in the exhaust gas 8 after passing through the condenser unit 2 due to the external pressure. This is performed to prevent the air from being included again and to prevent the inflow of outside air. Also, valve A
12 adjusts the degree of opening and closing in consideration of the balance of the amount of water for performing the water sealing A10, the capacity of the blower 4, and the amount of air of the exhaust gas 5. Generally, the smaller the amount of water in the water seal A10, the smaller the opening of the valve A12.

Thus, the condenser unit 2
The exhaust gas 8 from which the oil and water have been removed flows into the adsorption tower 3. As the adsorbent 7 filled in the adsorption tower 3, one containing at least a part of ceramic is used. Compared to activated carbon, ceramics generally have less risk of ignition even when heated, and have a characteristic of being less likely to deteriorate, so that there is no worry about mold generation and adhesion. In particular, when the present invention is applied to the exhaust gas deodorization treatment containing a large amount of oil and water as in this embodiment, the removal capacity of the condenser unit 2 is required to completely remove the oil and water in the condenser unit 2 in the former stage. Must be extremely excellent, and the equipment cost increases, which is uneconomical. Therefore, in practical use, the condenser unit 2 has the ability to remove oil and water completely, but to a certain extent.
I have to use

In this case as well, if ceramic is used as the adsorbent 7, the characteristic that it is hard to deteriorate is utilized, and even if a certain amount of oil and water remains in the exhaust gas 8, the activated carbon alone can be combined with the activated carbon. As a result, stable and efficient deodorization becomes possible. The reason why the ceramic and the activated carbon are used in combination as the adsorbent 7 is that the ceramic alone has a malodorous substance having a small adsorption ability, and is adsorbed by the activated carbon impregnated.

As a method for filling the adsorbent 7, (a) a method of combining different types of adsorbents in a multilayer series, (b) 1
Any method using a type of adsorbent may be used.
As an example of the case (a), a ceramic or activated carbon having good water absorbency, that is, a large apparent porosity is used for the first layer counted from the inlet side of the exhaust gas 8, and the basic layer has an adsorptivity of the basic gas for the second layer. For example, an activated carbon impregnated with an acidic substance is used, and a ceramic having good adsorptivity of an acidic gas and a neutral gas is used in the third layer.

In this case, the filling amount of the adsorbent 7 in each layer is
The concentration of the target substance to be deodorized / removed in the exhaust gas 8, the contact time (or space velocity) required for adsorption, the thickness required as an equilibrium layer, the flow rate of the exhaust gas 8, the saturated adsorption of the adsorbent 7 for each target substance The amount is determined in consideration of the amount, the replacement frequency of the adsorbent 7, the shape of the adsorption tower 3, and the like. Also,
The example of the case (b) is a case where the adsorbent 7 prepared by mixing ceramic and activated carbon is used. The method of determining the filling amount of the adsorbent 7 in this case is the same as in the case of (a).

The exhaust gas 9 that has passed through the adsorbent 7 in the adsorption tower 3 is discharged to the outside as the exhaust gas 6 by the blower 4. In addition, the shape of the adsorbent in any of the above-mentioned filling methods (a) and (b) may be either granular or honeycomb. In the case of granules, it is desirable to use those having a diameter in the range of 1 to 30 mm. When the diameter is 1 mm or less, the pressure loss at the time of filling is large, while the diameter is 3 mm.
If the thickness is 0 mm or more, the adsorption capacity is reduced because the surface area is reduced.

If the cooling capacity of the condenser unit 2 is not so large, the temperature of the exhaust gas 8 at the inlet of the adsorption tower 3 may be higher than the temperature of the exhaust gas 9 at the outlet of the adsorption tower 3. Under such conditions, the exhaust gas is cooled in the adsorption tower 3, and as in the case of this embodiment, the exhaust gas having a relative humidity of 100% causes condensation and condensation in the adsorption tower 3.
Condensed water may be generated and accumulate at the bottom of the adsorption tower 3.
In such a case, the dew / condensed water becomes a odor generating source and deteriorates the odor level of the exhaust gas 9 and the exhaust gas 6.

As a countermeasure, an inclined plate 16 and a drain pipe B15 are provided at the bottom of the adsorption tower 3 or at the bottom of the side face. The inclined plate 16 is for efficiently sending dew water to the drain pipe B15 without collecting dew water at the bottom of the adsorption tower 3. The drain pipe B15 is a pipe that includes a water seal B11 and flows outside as dew / condensed water 17. The condensation / condensed water 17 is collected or subjected to drainage treatment, similarly to the condensed water 21. The purpose of the water seal B11 is to prevent the dew / condensed water 17 from accumulating at the bottom of the adsorption tower 3 without flowing to the outside due to the external pressure, similarly to the water seal A10.

Next, experimental results of the exhaust gas deodorizing apparatus of the present invention will be described. FIG. 2 is experimental data showing the exhaust gas deodorizing effect when the garbage processing is performed by the exhaust gas deodorizing treatment apparatus of FIG. The horizontal axis indicates the elapsed time of garbage disposal, and the vertical axis indicates the odor sensor value. That is, the odor sensor value indicates how the odor of the exhaust gas changes according to the garbage processing elapsed time by the garbage dryer.

The odor sensor used in this experiment measures odor based on the principle of detecting a change in resistance value when a odor molecule adheres to the surface of a metal oxide semiconductor (SnO ₂ ) by a change in voltage. In this experiment, the odor level of the outside air was used as a reference value. That is, the odor sensor value was determined by the following equation. Odor sensor value = [Measurement value at each point with odor sensor]-[Measurement value of external odor with odor sensor] In the above formula, "Measurement value at each point with the odor sensor" changes with time. In other words, the rate of increase rapidly decreases at the beginning of the measurement, and the rate of increase decreases with time, and approaches a constant value.

The “outside odor measurement value by the odor sensor” is:
In a place sufficiently distant from the place where the exhaust gas 6 generated from the apparatus of FIG. 1 is discharged to the outside air and free from other odor sources, the outside air is continuously measured by the odor sensor, and a long time that can be regarded as a substantially constant value (30 minutes or more) was used. The data in FIG. 2 was obtained after operating the garbage dryer and the deodorizing treatment device once for 10 hours, once a day for a total of 100 days. As can be seen from FIG. 2, the odor sensor value of the exhaust gas 5 (a) at the inlet of the condenser unit 2 rapidly increases at the beginning with the elapsed time of the garbage treatment, reaches a maximum value around 1 hour after the elapsed time, and thereafter. Is slowly decreasing over time.

Looking at 1 hour after the odor sensor value of the exhaust gas 5 (a) at the inlet becomes almost the maximum value, the odor sensor value of the exhaust gas 8 (b) after the condenser unit 2 is compared with the odor sensor value of the exhaust gas 5 (a). The odor sensor value is reduced by about 12%, and the odor sensor value of the exhaust gas 9 (c) after the adsorption tower 3 is reduced by about 81%.

On the other hand, the relationship between these odor sensor values and the odor index obtained by the olfaction measurement method is in a linear proportional relationship as shown in FIG. 3, and when viewed from the corresponding odor index, the odor index of the exhaust gas 5 (a) at the inlet is obtained. Compared with 41, the odor index of the exhaust gas 8 (b) after the condenser unit 2 is 36, and the odor index of the exhaust gas 9 (c) at the outlet after the adsorption tower 3 is 12. In terms of odor index, the exhaust gas 9 (c) at the outlet has a significantly reduced odor index of about 1/4 as compared with the exhaust gas 5 (a) at the inlet. Has a large deodorizing effect.

FIG. 4 is a graph showing the tendency of the change in the measured odor value depending on the number of operating days of the exhaust gas deodorizing apparatus. That is, the odor sensor value of the exhaust gas 5 (a) at the inlet and the odor sensor value of the exhaust gas 8 (b) after the condenser unit 2 at the time when the inlet odor sensor value becomes almost maximum, that is, 1h after the garbage processing elapsed time. 7 is a graph showing how the odor sensor values of the exhaust gas 9 (c) at the outlet after the adsorption tower 3 change with the number of operating days. FIG.
As can be seen from the figure, the odor sensor value of the exhaust gas 9 (c) at the outlet after the adsorption tower 3 shows the lowest value at any time, and this figure also shows that the exhaust gas deodorizing treatment apparatus of the present invention has a large deodorizing treatment. It can be seen that it has an effect and that this deodorizing effect is stably maintained.

Next, a description will be given of the fact that the exhaust gas deodorizing treatment apparatus of the present invention has more effects than the sum of the deodorizing effects when the condenser unit 2 and the adsorption tower 3 are used independently. FIG. 5 is a graph showing the exhaust gas deodorizing effect of the adsorption tower alone in the apparatus of FIG.
That is, although not shown in FIG. 1, it is a graph showing the effect when the exhaust gas 5 is subjected to the exhaust gas deodorization treatment by providing a bypass and directly entering the adsorption tower 3 without passing through the condenser unit 2.

The odor sensor value was measured in the same procedure as in FIG. As is clear from FIG. 5, in the early stage of the garbage disposal, although the odor sensor value is lower at the outlet (after the adsorption tower) (b) than at the inlet (a), there is a deodorizing effect. As time elapses, the deodorizing effect of the outlet (after the adsorption tower) (b) rapidly attenuates, and after several hours (about 5 hours in FIG. 5).
At 1.5 h), the odor sensor value at the outlet (after the adsorption tower) (b) slightly exceeded the odor sensor value at the inlet (a). The presumed cause of this reversal phenomenon is that the exhaust gas that has entered the adsorption tower 3 at a high temperature without cooling is cooled inside the adsorption tower 3 and moisture condenses and condenses on the surface of the adsorbent 7 and the inner wall of the adsorption tower 3. As a result, in addition to the rapid decrease in the adsorbing capacity of the adsorbent 7, the dew-condensed water condenses and condenses when the condensed and condensed water evaporates again gradually with the passage of time and is discharged as a gas. It is considered that some of the malodorous substances dissolved therein volatilize at the same time and are emitted as a gas to be discharged.

On the other hand, the deodorizing effect of the condenser unit 2 alone is the same as the exhaust gas 5 (a) shown in FIGS.
Comparison between the odor sensor value of the condenser unit 2 and the odor sensor value of the exhaust gas 8 (b) after the condenser unit 2 reveals that the condenser unit 2 and the adsorption tower 3 are treated in combination at the outlet of the present invention. As compared with the odor sensor value of the exhaust gas 9 (c), the removal rate of the odor sensor value is less than half the effect.

Next, another embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a configuration diagram of an exhaust gas deodorizing treatment device according to another embodiment of the present invention. The other embodiment shown in FIG. 6 differs from the embodiment of FIG. 1 in that a heater 18 is provided around the adsorption tower 3 and a bypass pipe 19 from the exhaust gas 6 to the exhaust gas source 1 is provided. ,
That is, a valve C20 for switching a flow path to the outside air and a flow path to the bypass pipe 19 is provided. That is, in this embodiment, the adsorbent 7 is effectively regenerated by efficiently evaporating and cleaning the water adhering and adsorbed to the adsorbent 7 by the heater 18. In addition, the steam gas generated from the adsorbent 7 during the heating of the adsorption tower 3 is the moisture of garbage, and the moisture condensed and condensed while the malodorous substance is dissolved therein is evaporated. If discharged, there is a risk of generating a bad smell. Therefore, during heating and regeneration, the flow path of the valve C20 is switched to the bypass pipe 19 side so that the steam gas generated from the adsorbent 7 is returned to the exhaust gas generation source without being discharged to the outside air.

That is, when regenerating the adsorbent 7, the heater 18 is heated for a predetermined time,
The adsorbent 7 is heated through the adsorption tower 3, and the water adhering to and adsorbed on the adsorbent 7 is efficiently evaporated, and the adsorbent 7 can be regenerated. The heating temperature of the heater 18 for regenerating the adsorbent 7 depends on the adsorbent 7 filled in the adsorption tower 3.
Is desirably set so that the temperature falls within the range of 100 to 300 ° C.

The reason for setting the temperature range as described above is as follows. That is, when the temperature is lower than 100 ° C., the water adhering to and adsorbing on the surface and inside of the adsorbent 7 does not completely evaporate, so that some water remains on the adsorbent 7 and the regeneration is incomplete. Therefore, although the replacement time of the adsorbent 7 is extended, the replacement of the adsorbent 7 is still required.
On the other hand, if the temperature is higher than 300 ° C., there is a problem that the heater 18 becomes expensive or the power consumption increases. Further, when the adsorbent 7 partially contains activated carbon, there is a risk of ignition at 400 ° C. or higher. The time for heating the heater 18 for regeneration of the adsorbent 7 varies depending on the set temperature of the heater 18, and the higher the set temperature, the shorter the heating time.

An operation procedure for cleaning and regenerating the adsorbent 7 will be described. First, as described in the embodiment of FIG. 1, practically, the moisture of the garbage cannot be completely removed by the condenser unit 2. Therefore, a small amount of water flows into the adsorption tower 3 and adheres and adsorbs to the adsorbent 7.
Therefore, the operation of regenerating the adsorbent 7 is performed every predetermined period, judging from the actual use state and experience. When performing the regeneration operation, first, the heater 18 is heated, and at the same time, the valve C
The flow path 20 is switched to the bypass pipe 19 side. As a result, the adsorbent 7 is heated, and the water adhering and adsorbed thereon evaporates, and is returned from the blower 4 to the exhaust gas generation source 1 from the valve C20 via the bypass pipe 19. Further, the exhaust gas 5 is sent to the condenser unit 2 as the exhaust gas 5, where it is cooled and separated as a liquid in which malodorous substances are dissolved. Thereby, the adsorbent 7 is heated and
At the time of regeneration, the odorous gas generated from the moisture adhering to and adsorbed to the adsorbent 7 can be recovered or drained in a state of being dissolved in the condensed water 21 without being discharged in a gaseous state.
Then, when the regeneration operation is completed, the heater 18 is turned off, and the adsorbent 7 is cooled to a temperature at which no water vapor is generated.
Again, the flow path of the valve C20 is switched to the outside air side, and normal exhaust gas deodorization processing is started.

As described above, by periodically performing the regeneration process of the adsorbent 7 by heating the adsorption tower 3, the adsorbent 7 filled in the adsorption tower 3 can be recycled without being replaced. In addition, running costs can be reduced without generating waste. The drain pipe B shown in FIG.
As with the embodiment shown in FIG. 1 described above, during the normal exhaust gas deodorization treatment, a small amount of water from the condenser unit 2 flows into the adsorption tower 3 and forms dew. This is for discharging condensed water. Further, the water seal B11 provided in the drain pipe B15 has the same function as that of the embodiment shown in FIG. 1, and the description is omitted here.

[0040]

As described above, according to the exhaust gas deodorizing apparatus of the present invention, after removing the oil and water of the exhaust gas generated from the exhaust gas source by the removing means, the odor molecules in the exhaust gas are removed by the absorbing means. , The exhaust gas can be very effectively deodorized. In particular, since the exhaust gas discharged from the garbage dryer has a relative humidity of 100% and contains a large amount of water, conventional adsorption means could not sufficiently adsorb odor molecules. According to the exhaust gas deodorizing treatment apparatus of the present invention, the odor molecules are adsorbed after removing water and oil components in advance, so that the deodorizing treatment can be performed with extremely high efficiency. In addition, it is possible to effectively perform deodorization processing on exhaust gas generated from industrial wastes and the like, and to provide an exhaust gas deodorization processing apparatus that can contribute to the environmental protection standard of the ISO 14000 series. Furthermore, if a heating means such as a heater is provided in the adsorption tower and the adsorbent is forcibly heated at an appropriate temperature, the moisture adhering to and adsorbing to the adsorbent can be efficiently evaporated, so that the adsorbent can be effectively used. The adsorbent can be recycled for a relatively long period of time.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an exhaust gas deodorizing treatment device according to an embodiment of the present invention.

FIG. 2 is experimental data showing an exhaust gas deodorizing effect when garbage disposal is performed by the exhaust gas deodorizing treatment apparatus of FIG.

FIG. 3 is a characteristic diagram showing a relationship between an odor sensor value and an odor index by an olfactory measurement method.

FIG. 4 is a graph showing a tendency of a change in an odor measurement value according to the number of operating days of an exhaust gas deodorizing treatment device.

FIG. 5 is a graph showing the exhaust gas deodorizing effect of the adsorption tower alone in the apparatus of FIG.

FIG. 6 is a configuration diagram of an exhaust gas deodorizing apparatus according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Exhaust gas generation source, 2 ... Condenser unit, 3 ... Adsorption tower, 4 ... Blower, 5, 6, 8, 9 ... Exhaust gas, 7 ... Adsorbent, 10 ... Water sealing A, 11 ... Water sealing B, 12 ... Valve A, 13 ... Valve B, 14 ... Drain piping A, 15 ... Drain piping B, 16 ... Inclination plate, 17 ... Condensation / condensed water, 1
8: heater, 19: bypass pipe, 20: valve C,
21 ... Condensed water

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01J 20/20 B01D 53/34 ZAB (72) Inventor Kazuhiro Murata 1933-10 Shimonumabe, Nakahara-ku, Kawasaki-shi, Kanagawa Japan 10 Inside Electric Environment Engineering Co., Ltd. (72) Inventor Keiki Uchida 1933-10 Shimonuma, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Nippon Electric Environment Engineering Co., Ltd. F term (reference) 4C080 AA05 CC15 HH05 KK08 MM01 MM05 QQ11 QQ17 QQ20 4D002 AA00 AB02 BA04 BA12 BA13 BA16 CA07 CA20 DA41 DA70 EA03 EA08 EA13 GA02 GB02 4G066 AA05B AA72B AE01D BA41 BA42 CA02 DA02

Claims (11)

[Claims] 1. An exhaust gas deodorizing apparatus for deodorizing exhaust gas generated from a substance, comprising: removing means for removing oil and moisture contained in exhaust gas discharged from an exhaust gas generating source; An adsorbent that is filled with an adsorbent containing at least a part of ceramics and adsorbs odor molecules of the exhaust gas from which oil and water have been removed; an exhaust unit that exhausts the exhaust gas deodorized by the adsorber to the outside air; An exhaust gas deodorizing treatment device comprising: a removing unit, a connecting unit for connecting the adsorbing unit and the exhausting unit, and a venting unit for communicating with outside air. 2. A heating means for heating the adsorbing means, a bypass means for reducing exhaust gas to the exhaust gas generation source from the ventilation means communicating with the outside air from the exhaust means, a ventilation means communicating with the outside air, and the bypass. The exhaust gas deodorizing treatment apparatus according to claim 1, further comprising: a flow path switching means for selectively switching a flow path with the means. 3. The method according to claim 1, wherein the removing means includes a mist separator for removing oil in the exhaust gas, and an air-cooled or water-cooled condenser for removing moisture in the exhaust gas. The exhaust gas deodorizing treatment device according to claim 1 or 2, wherein 4. The condensed water discharging means for discharging the oil and water removed from the exhaust gas is provided in the removing means. An exhaust gas deodorizing treatment device according to item 1. 5. The condensed water discharging means according to an external pressure.
To prevent the condensed water from flowing to the outside and partially remaining in the removing means, or to prevent the exhaust gas after passing through the removing means from partially containing oil and water again, The exhaust gas deodorizing apparatus according to claim 4, further comprising a water seal for preventing inflow. 6. The adsorbing means is provided with an inclined plate for removing dew / condensed water generated in the adsorbing means at a bottom portion or a lowermost portion of a side surface.
The exhaust gas deodorizing treatment apparatus according to any one of claims 1 to 5, further comprising a dew / condensate discharge means for discharging the condensed water. 7. The dew / condensate discharge means, depending on the external pressure, the dew / condensate does not flow to the outside and partially stays in the adsorbing means, or the dew / condensed water condenses in the exhaust gas after passing through the adsorbing means. The exhaust gas deodorizing apparatus according to claim 6, further comprising a water seal for preventing a part of the condensed water from being included again and for preventing inflow of outside air. 8. The adsorbent filled in the adsorption means is a ceramic adsorbent and an activated carbon adsorbent filled in series or a mixture of the ceramic adsorbent and the activated carbon adsorbent. The exhaust gas deodorizing apparatus according to any one of claims 1 to 7, wherein the exhaust gas deodorizing apparatus is any one of: 9. When the ceramic adsorbent and the activated carbon adsorbent are filled in series, a ceramic or activated carbon having a large apparent porosity is used in the first layer counted from the exhaust gas inlet side, and the second layer is used in the second layer. 9. An activated carbon impregnated with a basic gas having good adsorptivity, and a ceramic having a good adsorptivity for an acidic gas and a neutral gas is used as a third layer.
An exhaust gas deodorizing treatment device according to item 1. 10. An outside air intake port is provided between an exhaust gas generation source and said removing means.
The exhaust gas deodorizing treatment device according to claim 9. 11. An exhaust gas deodorizing method for deodorizing exhaust gas generated from a substance, comprising: a step of removing oil and water contained in exhaust gas discharged from an exhaust gas source; and an odor of the exhaust gas from which the oil and water are removed. A method for deodorizing exhaust gas, comprising: a step of adsorbing molecules to an adsorbent containing at least a part of ceramics; and a step of exhausting deodorized exhaust gas to the outside air.