JP4633744B2 - Exhaust purification system and exhaust purification method - Google Patents

Description

The present invention relates to a system and an exhaust purification method for purifying exhaust including pollutants and odor components such as kitchen exhaust and toilet exhaust.

  For example, kitchen exhaust contains pollutants such as oil mist, and kitchen exhaust and toilet exhaust contain odorous components such as ammonia and hydrogen sulfide. For this reason, kitchen exhaust, toilet exhaust, etc., if discharged as they are, will cause a bad odor near the exhaust port. In addition, in a system that recovers heat by exchanging heat between the exhaust and intake outside air, there is a possibility that malodorous components may be transferred to the fresh intake outside air during heat exchange. Is difficult. Exhaust containing pollutants, such as kitchen exhaust, is particularly likely to contaminate the vicinity of the exhaust port with oil mist, etc., and heat exchangers are clogged with oil mist, etc., so the frequency of heat exchanger replacement is high. Therefore, the running cost reduction effect due to heat recovery cannot be obtained.

  Conventionally, in order to avoid such a problem, pollutants and malodorous components contained in kitchen exhaust or toilet exhaust are transferred to cleaning water by gas-liquid contact and removed. In addition, contaminants such as oil mist are removed by a particle removal filter, and malodorous components are removed by a chemical filter using the chemical adsorption principle. In addition, malodorous components are adsorbed and decomposed using activated carbon and a catalyst.

  However, when gas-liquid contact is used, conventionally, the wash water is not reclaimed, so that the amount of water used is large, the running cost is increased, and the water resources are not effectively used. In addition, conventionally, since there is no water quality control means such as pH value control, there is a drawback that the performance of removing malodorous components greatly depends on the pH value. Furthermore, the conventional gas-liquid contact device is very large and requires a large installation space. It is difficult to adopt in a general building such as a commercial area, and is difficult to implement.

  The particle removal filter can remove oil mist, but cannot remove malodorous components, and is ineffective in preventing malodor in the environment around the exhaust port. In this case, by installing a chemical filter on the downstream side of the particle removal filter and using it together, it is possible to remove both oil mist and malodorous components, but the particle removal filter and chemical filter need to be replaced frequently, especially chemical The deodorizing performance of the filter is short-lived. And since these used filters become industrial waste, they hinder environmental conservation.

  On the other hand, when activated carbon and a catalyst are used, there is an advantage that malodorous components can be decomposed even if oil mist adheres. However, since the activated carbon and the catalyst are expensive in price, the total cost (the cost that combines the initial cost and the running cost) becomes high. In addition, since the processing wind speed is limited (surface wind speed is about 0.8 m / s to 1.3 m / s), a very large installation space is required to obtain a high processing capacity. Furthermore, there are few quantitatively reliable evaluation results in terms of performance, and the effects of actual exhaust treatment are still unknown, and the technology is still under development and has not yet been widely put into practical use. .

An object of the present invention is to provide a system and an exhaust purification method that can purify kitchen exhaust, toilet exhaust, and the like at low cost without generating industrial waste.

In order to achieve this object, the present invention is a system for purifying exhaust gas containing malodorous components exhausted from an air-conditioned space, wherein the air-conditioned space is a kitchen facility or a toilet, and the malodorous components in the exhaust gas Exhaust purification means that absorbs the cleaning water by mass transfer, cleaning water purification and regeneration means for purifying and regenerating cleaning water contaminated by the mass transfer, and exhaust gas purified by the exhaust purification means is supplied to the air-conditioned space Heat recovery means capable of exchanging heat with the intake outside air, and supplying the outside air to the air-conditioned space without exchanging the intake outside air and / or an exhaust straight path for exhausting the exhaust from the air-conditioned space without exchanging heat. An outside air branch path for introducing intake air into the heat recovery means, an exhaust branch path for introducing exhaust gas into the heat recovery means, and an intake air flowing through the outside air direct path and the outside air branch path Control means for controlling the flow rate of the air and / or the flow rate of the exhaust gas flowing through the exhaust direct path and the exhaust branch path based on both the exhaust temperature after being purified by the exhaust purification means and the outside air temperature, or the outside air temperature is provided. It is characterized by.
Further, it is a system for purifying exhaust gas containing malodorous components exhausted from the air-conditioned space, wherein the air-conditioned space is a kitchen facility or toilet, and exhaust purification means for absorbing the malodorous components in the exhaust gas into the washing water by mass transfer A heat recovery means capable of exchanging heat with the intake outside air supplied to the air-conditioned space after being purified by the exhaust gas purification means, and an outside air direct path for supplying the intake outside air to the air-conditioned space without heat exchange; And / or an exhaust direct path that exhausts the exhaust from the air-conditioned space without exchanging heat, an outside air branch path that introduces intake outside air into the heat recovery means, an exhaust branch path that introduces exhaust into the heat recovery means, and an outside air direct path; Exhaust temperature and outside air temperature after the intake air flow through the outside air branch path and / or the exhaust gas flow through the exhaust direct path and exhaust branch path are purified by the exhaust gas purification means Characterized in that it comprises a control means for controlling, based on both or outside air temperature, an exhaust gas purification system is provided.

  In this exhaust gas purification system, the exhaust gas purification means preferably includes an eliminator made of a hydrophilic material or a filler for gas-liquid contact.

  The washing water purification / regeneration means may remove contaminants from the washing water by at least one of a decomposition process by biodegradation, a separation process by a separation membrane, and an adsorption process by physical adsorption.

Further, the cleaning water purification and regeneration means may adjust the pH of the cleaning water when the pH value of the cleaning water fluctuates, or by injecting ozone gas into the cleaning water, It may be one that prevents the generation of harmful bacteria, or may further prevent the generation of harmful bacteria by irradiating the washing water with ultraviolet rays as described in claim 7.
A drain container that receives the wash water that has flowed down may be provided, and the wash water in the drain container may be circulated and supplied to the nozzle of the exhaust purification unit. Moreover, you may provide the pump which circulates and supplies the wash water in a drain container to the nozzle of an exhaust gas purification means.
The heat recovery means may be a sensible heat exchanger.

  In the exhaust purification system of the present invention, the air-conditioned space is a space in a building or facility including, for example, a kitchen facility or a toilet. Exhaust gas contains pollutants such as oil mist generated in kitchen facilities, and malodorous components such as ammonia and hydrogen sulfide generated in kitchen facilities and toilets. Further, for example, city water, middle water, rain water, or the like is used as the cleaning water, and pure water can be used as the cleaning water. The substance transfer is exemplified by means for absorbing malodorous components and pollutants exhausted from the air-conditioned space into the cleaning water by, for example, gas-liquid contact. Examples of the heat recovery means include a total heat exchanger and a sensible heat exchanger. Further, the outside air direct path, the outside air branch path, the exhaust straight path, and the exhaust branch path are configured by, for example, ducts. Such ducts are appropriately provided with fans, open / close dampers, etc., and by controlling the operation of the fans and opening / closing of the open / close dampers, the flow rate of the external air flowing through the external air direct path and the external air branch path, the exhaust direct path, and the exhaust branch path The flow rate of the exhaust gas flowing through can be adjusted as appropriate. Only the direct exhaust path, the outside air branch path, and the exhaust branch path may be provided, and the outside air direct path may be omitted. In that case, the intake outside air always flows through the outside air branch path and is introduced into the heat recovery means, and the control means determines whether the exhaust direct path and the exhaust branch path are based on both the exhaust temperature and the outside air temperature or the outside air temperature. The flow rate of the exhaust gas flowing through is controlled. Then, only the exhaust introduced into the heat recovery means via the exhaust branch path by the control of the control means takes in and exchanges heat with the outside air. On the other hand, only the outside air direct path, the outside air branch path, and the exhaust branch path may be provided, and the exhaust straight path may be omitted. In that case, the exhaust always flows through the exhaust branch path and is introduced into the heat recovery means, and the control means switches the outside air straight path and the outside air branch path based on both the exhaust temperature and the outside air temperature, or the outside air temperature. The flow rate of the flowing outside air will be controlled. Then, only the intake outside air introduced into the heat recovery means via the outside air branch path by the control of the control means exchanges heat with the exhaust.

  In these exhaust purification systems, exhaust and cleaning water are brought into gas-liquid contact with the exhaust purification means so that pollutants and odorous components contained in the exhaust are absorbed into the cleaning water by mass transfer, Remove pollutants and odorous components from the exhaust. In this case, for example, malodorous components such as ammonia and hydrogen sulfide are dissolved in the cleaning water and removed from the exhaust gas by gas-liquid contact with the cleaning water sprayed on the exhaust gas. On the other hand, mainly pollutants such as oil mist are trapped in the wash water and removed from the exhaust by using, for example, an eliminator made of a hydrophilic material or a filler for gas-liquid contact. Note that some of the contaminants such as oil mist may be removed by gas-liquid contact with cleaning water sprayed on the exhaust gas.

  And after removing pollutants and malodorous components by the exhaust purification means in this way, the purified exhaust is exhausted to the outdoors by, for example, a blower or the like. At that time, exhaust by the heat recovery means (purified exhaust) It is possible to exchange heat with the outside air supplied to the air-conditioned space. In this case, both the exhaust temperature and the outside air temperature or only the outside temperature is detected, and the exhaust temperature and the outside temperature are compared. For example, the temperature (room temperature) of the exhaust exhausted from the air-conditioned space is often maintained at a substantially constant temperature throughout the year. In such a case, it is not always necessary to detect the exhaust temperature, and it is possible to detect only the outside temperature and compare the exhaust temperature (the set temperature of the room temperature) and the outside temperature. For example, when the exhaust temperature is lower than the outside air temperature, such as in summer, the outside air is introduced into the heat recovery means by appropriately controlling, for example, the operation of the fan and the opening / closing damper described above, and the exhaust gas is recovered by heat. The state is introduced into the means. Thus, by exchanging heat by the heat recovery means, the outside air can be cooled in advance before the cold heat in the exhaust gas is recovered and supplied to the air-conditioned space, so that energy saving can be achieved. Also, for example, in the winter, when the exhaust temperature is higher than the outside air temperature, the outside air is introduced into the heat recovery means and the exhaust is introduced into the heat recovery means by controlling the operation of the fan and the opening / closing damper as described above, for example. Let By exchanging heat with the heat recovery means in this way, the outside air can be preheated before the heat in the exhaust gas is recovered and supplied to the air-conditioned space, and energy can be saved as well. .

  As described above, the cleaning water that has absorbed pollutants such as oil mist and odorous components such as ammonia and hydrogen sulfide contained in the exhaust gas by mass transfer by contacting the exhaust gas with gas and liquid in the exhaust gas purification means. For example, it is recovered by the cleaning water purification and regeneration means. Then, in the cleaning water purification / regeneration means, the cleaning water is purified and regenerated, and the regenerated cleaning water is sent to the exhaust purification means, and is again brought into contact with the exhaust and gas / liquid. It will be removed by absorption.

Here, the contaminant collected in the washing water is decomposed by, for example, biodegradation and removed from the washing water in the washing water purification and regeneration means. For example, it is possible to purify the washing water by decomposing it with aerobic degrading bacteria that naturally propagate in the washing water (the origin is various dormant bacteria present in the airborne dust). Sludge (such as dead microorganisms) generated by this decomposition treatment is settled and separated in the washing water purification and regeneration means and removed from the washing water. On the other hand, the purified wash water is taken out as a supernatant and sent again to the exhaust gas purification means as wash water that has been purified and regenerated. In this case, the sludge generated by decomposing the pollutant may be separated from the washing water by concentrating using a separation membrane. Thus, the sludge that has been separated or concentrated by the washing water purification and regeneration means is discharged periodically or continuously. If necessary, a part of the sludge is returned to the washing water to reduce the concentration of decomposing bacteria. It is good to prevent.
In addition, the contaminant collected in the washing water is removed from the washing water in the washing water purification / regeneration means, for example, by a separation process using a separation membrane or an adsorption process using physical adsorption. In this case, the separation membrane should be an appropriate separation membrane that can remove the contaminants and malodorous components (organic components and inorganic ion components) collected in the washing water by the exhaust purification means and remove them from the washing water. It is good to choose. In addition, the activated carbon can be used to physically adsorb and remove contaminants and odorous components from the wash water, and the ion exchange fiber can be used to chemically remove contaminants and odorous components from the washed water. it can.

Some malodorous components such as hydrogen sulfide recovered in the wash water cannot be decomposed by aerobic degrading bacteria, but the malodorous components usually recovered in the wash water are less than pollutants such as oil mist. The equilibrium concentration determined by the amount of malodorous components discharged together with the cleaning water containing sludge and the amount of malodorous components recovered from the exhaust gas is not so high as to greatly reduce the cleaning water removal performance against the malodorous components. Therefore, it is usually not necessary to remove malodorous components from the wash water. However, when the concentration of malodorous components in the exhaust gas is high and a decrease in cleaning water removal performance against the malodorous components becomes a problem, these inorganic components can be removed with a separation membrane or adsorbent. Moreover, when pH value fluctuates by concentration of these malodorous inorganic components, it is good to adjust pH of washing water. For example, ammonia (ammonium ion in water) is decomposed into nitrate ions and nitrite ions, which are acidic ions, by aerobic degrading bacteria, and hydrogen sulfide also becomes acidic ions, so that the washing water tends to be biased toward the acidic side. And if washing water becomes acidic, the removal performance of hydrogen sulfide which is acidic gas will fall. In order to prevent this, it is effective to introduce an alkaline agent such as sodium hydrogen carbonate or sodium carbonate into the washing water or to install an ion exchange cartridge for removing acidic ions in the washing water. Furthermore, pH value control by electrolysis is also effective, and in this case, a bactericidal effect is also added. Further, supplementing supplementary water such as city water, rainwater, middle water, or pure water to the wash water to increase the amount of the wash water also has an effect of adjusting the pH of the wash water that is biased toward the neutral side. If the malodorous component can be separated from the washing water using the separation membrane, the reduction in the removal rate of the malodorous component due to the change in pH as described above can be prevented.
In addition, it is possible to prevent the generation of sludge and harmful bacteria by injecting ozone gas into the wash water from which contaminants and malodorous components have been removed, or by irradiating the wash water with ultraviolet rays. By thus injecting ozone gas and irradiating with ultraviolet rays, the cleaning liquid can be sterilized, and the generation of bacteria and algae can be suppressed in the eliminator and filler provided in the exhaust gas purification means. In particular, ozone gas can promote the decomposition of organic substances, and sludge leaking from the cleaning water purification and regeneration means can be decomposed with ozone gas to prevent sludge accumulation in the exhaust purification means.

  In the cleaning water purification and regeneration means, all the pollutants and malodorous components (organic components and inorganic ion components) recovered in the cleaning water are filtered through a separation membrane without using the above-described decomposition treatment using decomposing bacteria. Can also be removed. In this case, all the pollutants and malodorous components (concentrated wastewater) concentrated by filtration are discarded, and only the cleaning water purified and regenerated by removing pollutants and malodorous components is sent to the exhaust purification means again. . By selecting an appropriate separation membrane, both contaminants and malodorous components can be filtered from the wash water and removed as concentrated waste water. In addition, you may make it remove a pollutant and a malodorous component with multiple types of separation membrane by arrange | positioning multiple types of separation membrane in series with respect to the flow of washing water.

  In this way, by cleaning and regenerating the cleaning water in the cleaning water purification and recycling means and sending it back to the exhaust purification means, and by reusing the cleaning water, the amount of cleaning water used (the amount of makeup water) can be greatly reduced. Further, by performing heat recovery from the exhaust, the heat energy required for air conditioning can be reduced.

  According to the present invention, heat energy is recovered from the exhaust gas and the outside air is cooled and heated in advance, so that heat energy is reduced and mist leakage of the cleaning liquid can be prevented. In addition, there is no worry that bad odor will be transferred to the outside air supplied to the air-conditioned space. If the cleaning water is purified and reclaimed and reused, the amount of cleaning water used (the amount of replenishing water) can be greatly reduced, running costs can be reduced, and a large installation space is not required, thus saving space. Unnecessary industrial waste can also be reduced.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram of a configuration of an exhaust purification system 1 according to an embodiment of the present invention. The exhaust gas purification system 1 is configured as a system for purifying exhaust gas containing pollutants such as oil mist generated in a kitchen facility and malodorous components such as ammonia and hydrogen sulfide generated in a kitchen facility and a toilet.

  For example, in an air-conditioned space including a kitchen facility and a toilet, outside air OA taken in from the outside, and in some cases, outside air OA and return air RA from the air-conditioned space are supplied through the air supply duct 10. Yes. The intake outside air OA supplied to the air-conditioned space through the air supply duct 10 is appropriately air-conditioned (temperature adjustment, humidity adjustment, cleaning, etc.) by the air conditioner 11. The air conditioner 11 also includes a blower (not shown). Upstream of the air conditioner 11, the air supply duct 10 includes an outside air direct duct 13 as an outside air direct path that directly passes the outside air OA into the air-conditioned space without performing heat exchange by the heat exchanger 18 as heat exchange means, and an outside air intake. It is formed by being divided into an outside air branching duct 14 as an outside air branching path for allowing the OA to exchange heat with the heat exchanger 18 and then passing through the air-conditioned space. The outside air direct duct 13 is provided with a check damper (non-return damper) 15.

  The outside air branch duct 14 is provided with a fan 16 as a blowing means, and the operation of the fan 16 enables the intake outside air OA to be taken into the outside air branch duct 14 from the outside air straight duct 13. The outside air branch duct 14 is provided with an open / close damper (volume damper) 17 and a heat exchanger 18 as a heat exchanging means. By changing the opening degree of the open / close damper 17, the outside air is branched by the operation of the fan 16. The air volume of the intake outside air OA taken into the duct 14 can be adjusted. Note that a fan (not shown) provided in the air conditioner 11 does not cover the entire flow rate of the intake outside air blown by the outside air direct duct 13, and the fan 16 provided in the outside air branch duct 14 is in the outside air branch duct 14. Only the flow rate of the intake air taken in is covered.

  The operation of the fan 16 and the opening degree of the open / close damper 17 are controlled by a control means 23 such as a microcomputer. Further, a temperature sensor 25 for measuring the temperature of the intake outside air OA taken from outside is provided near the inlet of the air supply duct 10, and the temperature of the intake outside air OA measured by the temperature sensor 25 is controlled by the control means. 23 is input.

  On the other hand, exhaust (including kitchen exhaust, toilet exhaust, etc.) EA generated in the air-conditioned space is exhausted to the outside through the exhaust duct 30. Exhaust EA generated in the air-conditioned space contains pollutants such as oil mist generated in the kitchen facility and malodorous components such as ammonia and hydrogen sulfide generated in the kitchen facility and toilet. The exhaust duct 30 is provided with exhaust purification means 31 that removes and purifies contaminants and malodorous components from the exhaust EA.

  An eliminator 35 is arranged so as to partition the inside of the exhaust gas purification means 31 into an upstream space 32 and a downstream space 33. In the illustrated example, the eliminator 35 includes a hydrophilic material having a structure in which silica fine particles or the like are attached to the surface of a base material obtained by molding polyester fibers with a binder such as a phenol resin. It has a structure in which a plurality of sheets are formed in a flow path with a plurality of intervals in the flow path. As will be described later, a water film of the cleaning water a can be formed on the entire surface of the eliminator 35.

  A nozzle 36 for spraying the cleaning water a is arranged in the upstream space 32 inside the exhaust purification means 31, and almost the entire inside of the upstream space 32 is a mist of the cleaning water a sprayed from the nozzle 36. Is being charged. In the illustrated example, city water, middle water, rain water, or the like is used as the washing water a. Further, the cleaning water a sprayed from the nozzle 36 in this manner adheres to the surface of the eliminator 35, whereby a water film of the cleaning water a is formed on the entire surface of the eliminator 35.

  Exhaust gas EA generated in the above-described air-conditioned space is supplied from the exhaust duct 30 into the exhaust gas purification means 31 and passes through the upstream space 32, the eliminator 35, and the downstream space 33 in this order. When the exhaust gas EA passes through the upstream space 32 and the eliminator 35, the pollutants and malodorous components contained in the exhaust gas EA are absorbed in the washing water a, and the pollutants and malodorous components are extracted from the exhaust gas EA. It is supposed to be removed. The eliminator 35 captures contaminants such as oil mist by inertial collision, and also removes malodorous components such as ammonia and hydrogen sulfide that could not be absorbed into the mist of the washing water a in the upstream space 32 by the surface of the eliminator 35. It has a function of collecting in the water film (washing water a). By this eliminator 35, malodorous components and the like can be efficiently removed with a small spray amount of the washing water a.

  A fan 37 is provided in the downstream space 33 inside the exhaust purification unit 31. By operating the fan 37, the exhaust EA that has passed through the upstream space 32, the eliminator 35, and the downstream space 33 in this order is blown further downstream by the exhaust duct 30 and exhausted outdoors. . The operation of the fan 37 is controlled by the control means 23. A temperature sensor 38 for measuring the temperature of the exhaust EA exhausted through the exhaust duct 30 is provided in the vicinity of the outlet of the exhaust purification means 31. The temperature of the exhaust EA measured by the temperature sensor 38 is It is input to the control means 23.

  Inside the exhaust purification means 31, a drain container 39 is formed at the bottom of the upstream space 32 to receive the cleaning water a sprayed and dropped from the nozzle 36 and the cleaning water a flowing down the surface of the eliminator 35. The washing water a in the drain container 39 is drained from the drain pipe 40 opened at the bottom surface of the drain container 39, flows in the liquid feed pipe 42 by the power of the pump 41, passes through the return pipe 43, and is then nozzle It is circulated to 36 and sprayed again toward the upstream space 32. In the drain container 39, the liquid level of the cleaning water a is detected by the float 45. When the liquid level of the cleaning water a falls below a predetermined level by the float 45, the supply water is supplied from the supply pipe 46 as makeup water. Water, rainwater, middle water, pure water, or the like is supplied into the drain container 39.

  Also, upstream of the liquid supply pipe 42 provided with the pump 41, the cleaning water a purified and regenerated by removing the malodorous components and contaminants by the cleaning water purification and regenerating means 50 flows into the liquid supply pipe 42. An inlet pipe 51 is connected, and an outlet pipe 52 for returning the cleaning water a to the cleaning water purification / regeneration means 50 is connected as a branch pipe to the downstream side of the liquid feeding pipe 42. In this way, the washing water a that has passed through the drain pipe 40 from the drain container 39 and the washing water a that has been purified and regenerated by the washing water purification and regenerating means 50 flow into the liquid feeding pipe 42 and are mixed together. It has become. A part of the washing water a thus mixed is circulated and supplied to the nozzle 36 through the return pipe 43, and the rest is returned to the washing water purification / regeneration means 50 again through the outlet pipe 52. In order to increase the water supply pressure, booster pumps may be appropriately provided in the drainage pipe 40, the liquid supply pipe 42, the return pipe 43, the inlet pipe 51, the outlet pipe 52, and the like.

  Here, FIGS. 2 to 4 all show a specific configuration of the cleaning water purification / regeneration means 50, and FIGS. 2 to 4 show different types of cleaning water purification / regeneration means 50. The cleaning water purification / regeneration means 50 shown in FIG. 2 decomposes contaminants in the cleaning liquid a by biodegradation, and includes a BOD decomposition tank 55 and a precipitation tank 56, and passes through the outlet pipe 52 described above. The washing water “a” returned to the washing water purification / regeneration means 50 flows in the order from the BOD decomposition tank 55 to the sedimentation tank 56 and then flows into the inlet pipe 51.

  In the BOD decomposition tank 55, air is sent from the air supply pump 59, whereby the cleaning water a is aerated in the BOD decomposition tank 55. In the BOD decomposition tank 55, the contaminants contained in the washing water a are aerobically decomposed bacteria that naturally propagate in the washing water a (the source is various dormant in the airborne dust). Decomposition treatment by bacteria). The sludge generated by the decomposition treatment flows from the BOD decomposition tank 55 into the precipitation tank 56 together with the washing water a. In the settling tank 56, by appropriately setting the size and flow rate, the sludge is continuously settled and separated from the wash water a and removed from the wash water a. The cleaning water a purified in this way is taken out as a supernatant liquid of the precipitation tank 56, and is sent to the inlet pipe 51 as cleaning water a purified and regenerated. In addition, the sludge settled and separated in the sedimentation tank 56 is discharged | emitted through the discharge pipe 61 by operation | movement of the discharge pump 60 comprised, for example by a slurry pump. If necessary, a part of the sludge settled and separated in the sedimentation tank 56 is returned to the BOD decomposition tank 55 through the return pipe 62, thereby preventing a decrease in the concentration of decomposing bacteria in the BOD decomposition tank 55. It is like that.

  Next, the cleaning water purification / regeneration means 50 shown in FIG. 3 includes a separation tank 66 using a separation membrane 65 instead of the sedimentation tank 56 in the cleaning water purification / regeneration means 50 described above with reference to FIG. Except for the point that a separation tank 66 is provided instead of the precipitation tank 56, the cleaning water purification / regeneration means 50 shown in FIG. 3 has the same configuration as the cleaning water purification / regeneration means 50 described above with reference to FIG. 2 and FIG. 3 are denoted by common reference numerals, and redundant description is omitted. Like the washing water purification / regeneration means 50 shown in FIG. 3, the sludge generated by decomposing the contaminants in the BOD decomposition tank 55 is concentrated in the separation tank 66 using the separation membrane 65. The sludge may be separated from the washing water a.

  Since some offensive odor components such as hydrogen sulfide recovered in the washing water a by the exhaust gas purification means 31 cannot be decomposed by aerobic degrading bacteria, the washing water described in FIGS. Depending on the purification and regeneration means 50, it is difficult to remove malodorous components from the washing water a. However, the malodorous component normally recovered in the washing water a is a small amount compared to pollutants such as oil mist, and the malodorous component discharged together with the sludge in the washing water purification / regeneration means 50 shown in FIGS. The equilibrium concentration determined by the amount and the amount of malodorous component recovered from the exhaust EA by the exhaust gas purification means 31 is not so high as to greatly reduce the removal performance of the cleaning water a with respect to the malodorous component. Therefore, it is not usually necessary to remove malodorous components from the washing water a. However, when the concentration of the malodorous component in the exhaust EA is high and the reduction in the performance of removing the washing water a with respect to the malodorous component becomes a problem, the pH of the washing water a may be adjusted in the cleaning water purification / regeneration means 50. For that purpose, it is preferable to install an alkaline agent in the washing water a, install an ion exchange cartridge for removing acidic ions in the washing water a, or install an electrolyzer capable of separating and removing acidic ions. Further, the wash water a may be increased by supplementing the wash water a with supplementary water such as city water, rain water, middle water, or pure water. If the separation membrane 55 capable of separating malodorous components is used in the cleaning water purifying and regenerating means 50 described with reference to FIG. 3, malodorous components can also be removed from the flushing water a, and the rate of removal of malodorous components due to changes in pH is reduced. Can be prevented.

  Next, the cleaning water purification / regeneration means 50 shown in FIG. 4 is different from the cleaning water purification / regeneration means 50 described above with reference to FIGS. Is. The cleaning water purification / regeneration means 50 shown in FIG. 4 has a separation tank 71 provided with a separation membrane 70. The separation membrane 70 can filter and remove the pollutants and malodorous components (organic components and inorganic ion components) collected in the washing water a by the exhaust gas purification means 31 from the washing water a. Select an appropriate separation membrane. In the cleaning water purifying and regenerating means 50 shown in FIG. 4, all the pollutants and malodorous components (concentrated wastewater) filtered and concentrated by the separation membrane 70 are discharged through the discharge pipe 72, and thus the pollutants and malodorous components. Only the cleaning water a purified and regenerated by removing the water is fed to the inlet pipe 51. In the case where the single separation membrane 70 cannot remove contaminants and malodorous components from the washing water a, a plurality of types of separation membranes may be arranged in series with respect to the flow of the washing water a.

  As shown in FIG. 1, the exhaust duct 30 downstream of the exhaust purification means 31 is a direct exhaust duct as a direct exhaust path for exhausting the exhaust EA directly to the outside without performing heat exchange by the heat exchanger 18 as heat exchange means. 75 and an exhaust branch duct 76 as an exhaust branch path for guiding the exhaust EA to the heat exchanger 18 described above. The exhaust direct duct 75 is provided with an open / close damper (volume damper) 80.

  The exhaust branch duct 76 includes an open / close damper (volume damper) 81. By changing the opening degree of the open / close damper 81 and the open / close damper 80 described above, the exhaust EA blown by the operation of the fan 37 is exhausted from the exhaust direct duct 75 that does not perform heat exchange and the heat exchanger 18. The branch ducts 76 can be appropriately distributed and supplied.

  The opening degree of the open / close damper 80 and the open / close damper 81 is also controlled by the control means 23 in the same manner as the fan 16, the open / close damper 17, and the fan 37. The control means 23 controls the fans 16, 37 and the open / close dampers 17, 80, 81 based on the temperature of the intake outside air OA detected by the temperature sensor 25 and the temperature of the exhaust EA detected by the temperature sensor 38, respectively. To do. In the illustrated example, when the exhaust temperature is lower than the outside air temperature, for example, in summer, or when the exhaust temperature is higher than the outside temperature, for example, in winter, the fan 16 is operated and the opening / closing damper 17 is opened. The intake outside air OA is passed from the outside air branch duct 14 to the heat exchanger 18, the fan 37 is operated, and the opening / closing damper 81 is opened and the opening / closing damper 80 is closed, whereby the exhaust branch duct 76 having the heat exchanger 18 is exhausted to the exhaust EA. To supply. On the other hand, in the middle period such as spring and autumn when the temperature difference between the exhaust EA and the intake outside air OA is small, the fan 16 is stopped and the open / close damper 17 is closed, whereby the intake outside air OA is passed through the outside air direct duct 13 and the fan 37 is turned on. The exhaust EA is passed through the exhaust direct duct 75 by operating and closing the open / close damper 81 and opening the open / close damper 80.

  In the exhaust purification system 1 according to the embodiment of the present invention configured as described above, the exhaust EA exhausted through the exhaust duct 30 by the operation of the fan 37 from the air-conditioned space is first sent to the exhaust purification means 31. Inflow. Then, when the exhaust gas EA and the cleaning water a come into gas-liquid contact with the exhaust gas purification means 31, the pollutants and odor components contained in the exhaust gas EA are absorbed into the cleaning water a, and the pollutants are extracted from the exhaust gas EA. And odor components are removed.

  In this case, malodorous components such as ammonia and hydrogen sulfide contained in the exhaust EA mainly come into gas-liquid contact with the mist of the cleaning water a filled in the upstream space 32 inside the exhaust purification means 31. , Dissolved in the washing water a and removed from the exhaust. Further, malodorous components that could not be absorbed in the mist of the cleaning water a in the upstream space 32 are collected in the water film (cleaning water a) on the surface of the eliminator 35. On the other hand, pollutants such as oil mist contained in the exhaust EA are trapped by inertial collision mainly on the surface of the eliminator 35 disposed so as to partition the inside of the exhaust gas purification means 31, and further, the eliminator 35 is washed by the washing water a. Will be washed away from the surface.

  Then, after removing pollutants and malodorous components by the exhaust gas purification means 31 in this way, the purified exhaust gas EA is exhausted by the operation of the fan 37 provided in the downstream space 33 inside the exhaust gas purification means 31. Then, the air is further blown downstream and exhausted outdoors. At this time, for example, when the temperature of the exhaust EA detected by the temperature sensor 38 is lower than the temperature of the intake outside air OA detected by the temperature sensor 25, for example, in summer, or detected by the temperature sensor 38, for example, during winter. When the temperature of the exhaust EA is higher than the temperature of the intake outside air OA detected by the temperature sensor 25, the exhaust EA is supplied to the exhaust branch duct 76 including the heat exchanger 18 by opening the open / close damper 81 and closing the open / close damper 80. Supply. On the other hand, in the middle period such as spring and autumn when the temperature difference between the exhaust EA and the intake outside air OA is small, the open / close damper 81 is closed and the open / close damper 80 is opened to supply the exhaust EA to the exhaust direct duct 75.

  On the other hand, with respect to the air-conditioned space, the outside air OA taken from the outside (in some cases together with the return air RA from the air-conditioned space) is appropriately air-conditioned by the air conditioner 11 via the air supply duct 10. It is aired. Then, for example, when the temperature of the exhaust EA detected by the temperature sensor 38 is lower than the temperature of the intake outside air OA detected by the temperature sensor 25, for example, in summer, or when the temperature is detected by the temperature sensor 38, for example, during winter. When the temperature of the EA is higher than the temperature of the intake outside air OA detected by the temperature sensor 25, the fan 16 is operated and the opening / closing damper 17 is opened, so that the intake outside air OA taken from the outside is removed from the outside air branch duct 14. Through the heat exchanger 18, the intake outside air OA is exchanged with the exhaust EA supplied to the heat exchanger 18 from the exhaust branch duct 76 as described above. By exchanging heat with the heat exchanger 18 in this way, the cold and warm heat in the exhaust EA can be recovered and the intake outside air OA can be cooled or heated in advance before being supplied to the air-conditioned space. Energy can be planned. On the other hand, in the middle period such as spring and autumn when the temperature difference between the exhaust EA and the intake outside air OA is small, the fan 16 is stopped and the open / close damper 17 is closed, whereby the intake outside air OA is passed through the outside air direct duct 13 and the fan 37 is turned on. The exhaust EA is passed through the exhaust direct duct 75 by operating and closing the open / close damper 81 and opening the open / close damper 80. Thus, in the intermediate period, the intake outside air OA is supplied to the air-conditioned space without heat exchange with the exhaust EA.

  On the other hand, as described above, the exhaust purification means 31 absorbs malodorous components such as ammonia and hydrogen sulfide contained in the exhaust EA, and the cleaning water a that has washed away contaminants such as oil mist is exhausted purification means 31. After being received by the drain container 39, the liquid is drained from the drain pipe 40. The washing water a discharged from the drain container 39 is mixed and diluted with the washing water a purified and regenerated by the washing water purification and regenerating means 50 when flowing through the liquid feed pipe 42 by the power of the pump 41. The washing water a returns to the purified and regenerated state. After being purified and regenerated in this way, the wash water a is circulated and supplied to the nozzle 36 through the return pipe 43 and sprayed again toward the upstream space 32 to be used for absorbing pollutants and malodorous components in the exhaust EA. The

  As described above, in the exhaust purification system 1 according to the embodiment of the present invention, the intake outside air OA recovered from the exhaust EA and supplied to the air-conditioned space can be cooled and heated in advance, which is necessary for air conditioning. Energy can be reduced. At that time, since heat exchange is performed by the exhaust gas EA purified by the exhaust gas purification means 31, there is no fear of contaminating the heat exchanger 18 and the like, and there is a concern that bad odors may be transferred to the intake outside air OA supplied to the air-conditioned space. Nor. Further, the eliminator 35 made of a hydrophilic material captures the mist of the washing water a and prevents the mist from leaking into the exhaust EA purified by the exhaust purification means 31. There is no need to get wet and corrosion can be suppressed. In addition, the cleaning water a that has absorbed the pollutants and malodorous components in the exhaust EA by the exhaust gas purification means 31 is purified and regenerated by the cleaning water purification and regeneration means 50 and reused. ) Can be drastically reduced, running costs can be reduced, and a large installation space is not required, thus saving space.

  As mentioned above, although an example of preferable embodiment of this invention was demonstrated, this invention is not limited to the form demonstrated here. Here, FIGS. 5 to 7 each show an exhaust purification means 31 having a configuration different from that of the exhaust purification means 31 described in FIG. In the exhaust purification means 31 shown in FIG. 5, all of the cleaning water a discharged from the drain container 39 through the drain pipe 80 is sent to the cleaning water purification / regeneration means 50, and the return pipe is driven by the power of the pump 81. It is circulated and supplied to the nozzle 36 through 82. Except for the point that all the washing water a discharged from the drain container 39 is sent to the washing water purification / regeneration means 50 in this way, the exhaust purification means 31 shown in FIG. Since the configuration is the same as that of the exhaust gas purification means 31 described in the above, the same reference numerals are assigned to FIGS. 1 and 5 to omit redundant description. In the exhaust gas purification means 31 shown in FIG. 5, since all of the cleaning water a is purified and regenerated by the cleaning water purification and regeneration means 50, the pollution of the exhaust gas EA compared to the exhaust gas purification means 31 described in FIG. It is suitable when the level is high. Of course, even when the contamination level is low, the exhaust gas purification means 31 shown in FIG. 5 can reduce accumulation of sludge and the like as compared with the exhaust gas purification means 31 described above with reference to FIG.

  The exhaust purification means 31 shown in FIG. 6 includes a gas / liquid contact filler 85 instead of the eliminator 35 so that the interior of the exhaust purification means 31 is partitioned into an upstream space 32 and a downstream space 33. Washing water a is supplied (without spraying) from the upper water supply port 86 to the disposed filler 85. As the water supply port 86, for example, a porous water sprinkler or the like is employed. In the illustrated example, the filler 85 has a configuration in which bent plates made of a nonwoven fabric as a base material are laminated in multiple stages, and the exhaust EA flows through the gaps between the bent plates. In addition, when a water supply location is high, it is good to supply the washing water a by providing the water supply port 86 not only in the uppermost part of the filler 85 but also in the middle. Except for the point that the cleaning water a is directly supplied to the filler 85 from the water supply port 86 in this way, the exhaust purification means 31 shown in FIG. 6 is the same as the exhaust purification means 31 previously described in FIG. Since it is the same structure, the overlapping description is abbreviate | omitted by attaching | subjecting a common code | symbol to FIG. 1 and FIG. In the exhaust gas purifying means 31 shown in FIG. 6, when the exhaust gas EA passes through the filler 85, the pollutants and malodorous components contained in the exhaust gas EA are washed with water a by the gas-liquid contact and inertial collision. The pollutants and malodorous components are removed from the exhaust EA. According to the exhaust gas purification means 31 shown in FIG. 6, a compact exhaust gas purification means 31 can be configured since the spray space for the washing water a is not required. In addition, if the bending plate which comprises the filler 85 is inclined and arrange | positioned below, it will become possible to make the contaminant trapped by the filler 85 flow down smoothly with the washing | cleaning liquid a. In the exhaust purification means 31 shown in FIG. 6, in order to improve the removal efficiency of pollutants and malodorous components, the volume of the filler 85 is preferably increased. Further, an eliminator may be further arranged on the downstream side of the filler 85 in order to prevent the mist of the washing water a from leaking to the heat exchanger 18 or the like.

  In the exhaust purification means 31 shown in FIG. 7, all of the wash water a discharged from the drain container 39 through the drain pipe 80 is sent to the wash water purification / regeneration means 50 and returned by the power of the pump 81. The cleaning liquid a sprayed from the water supply port 86 is supplied to the filler 85 from above through the pipe 82. In this way, except that the entire cleaning water a discharged from the drain container 39 is sent to the cleaning water purification / regeneration means 50, and the cleaning water a is directly supplied to the filler 85. The exhaust purification means 31 shown in FIG. 7 has the same configuration as that of the exhaust purification means 31 described above with reference to FIG. . According to the exhaust gas purification means 31 shown in FIG. 7, the advantages of both the exhaust gas purification means 31 previously described with reference to FIG. 5 and the exhaust gas purification means 31 previously described with reference to FIG. 6 can be achieved.

  In the exhaust gas purification means 31 described with reference to FIGS. 1 and 5 to 7, as a material for the eliminator 35 and the filler 85, for example, a hydrophilic material such as a coarse nonwoven fabric structure or a sponge-like porous block body is used. Even if it arrange | positions, the equivalent removal performance will be obtained with the equivalent amount of washing water. However, there is a possibility that the capturing performance of water droplets or oil mist may be lowered, so a method of dealing with it by increasing the filling amount of the nonwoven fabric structure or the like can be considered. A non-hydrophilic eliminator or filler may be used, but when a non-hydrophilic eliminator or filler is used, it is preferable to increase the spray amount of the washing water a.

  Moreover, in the exhaust gas purification means 31 demonstrated in FIG.1 and FIG.5-7, although the example which supplies makeup water in the drain container 39 was shown, the water supply place of makeup water is not specifically limited. For example, makeup water may be supplied at the top of the eliminator 35 or filler 85.

The heat exchanger 18 may be either a total heat exchanger or a sensible heat exchanger. If a total heat exchanger is used as the heat exchanger 18, the heat exchange rate is higher than that of the sensible heat exchanger, and a high heat recovery rate can be obtained. However, a sensible heat exchanger may be used when the transfer of malodorous components to the intake outside air becomes a problem. Moreover, although various systems, such as a rotation type and a fixed type, can be utilized as the heat exchanger 18, the system of a heat exchanger is not specifically limited. In order to reduce the installation space and installation cost, a fixed heat exchanger is desirable.
Moreover, although the example which detects both the temperature of intake external air OA and the temperature of exhaust_gas | exhaustion EA was demonstrated, the temperature (room temperature) of exhaust_gas | exhaustion EA exhausted from air-conditioning space is often maintained at a substantially constant temperature throughout the year. In such a case, it is not always necessary to detect the temperature of the exhaust EA, and only the temperature of the outside air OA can be detected by the temperature sensor 25 and the temperature of the exhaust EA (the set temperature of the room temperature) can be compared with the temperature of the outside air OA. It is. In such a case, the temperature sensor 38 may be omitted.
Further, a motor damper or the like can be provided in the outside air direct duct 13 in place of the check damper 15 and the flow rate of the outside air OA taken into the outside air straight duct 13 and the outside air branching duct 14 can be adjusted by opening and closing the motor damper. In that case, the fan 16 can be omitted.

In FIG. 1, the air supply duct 10 is branched into the outside air direct duct 13 and the outside air branch duct 14, and the exhaust duct 30 is branched into the exhaust direct duct 75 and the exhaust branch duct 76. It is also possible to omit the outside air direct duct 13 or omit the exhaust exhaust duct 75 in the exhaust duct 30. When the outside air direct duct 13 is omitted, the intake outside air OA always flows through the outside air branch duct 14 and is introduced into the heat exchanger 18. If the exhaust direct duct 75 is omitted, the exhaust EA always flows through the exhaust branch duct 76 and is introduced into the heat exchanger 18.
It is also possible to prevent the generation of sludge and harmful bacteria by injecting ozone gas into the cleaning water a from which contaminants and malodorous components have been removed, or by irradiating the cleaning water a with ultraviolet rays. In this case, for example, in the cleaning water purification / regeneration means 50 described with reference to FIGS. 2 to 4, a liquid reservoir portion of the cleaning liquid a is formed in the inlet pipe 51, and ozone gas is bubbled into the cleaning liquid a stored in the liquid reservoir portion, or It is preferable to irradiate the cleaning liquid a stored in the liquid storage part with ultraviolet rays.

For the exhaust purification system 1 according to the embodiment of the present invention described with reference to FIG. 1, the processing cost of kitchen exhaust was calculated under the following conditions.
<Assumption of trial calculation>
“Exhaust treatment object” kitchen exhaust: 60 times of ventilation, kitchen volume: 3 m × 10 m × 2.5 = 75 m ³ , exhaust air volume: 75 × 60 = 4, 500 m ³ / h
“Blasting power” air volume m ³ / min × pressure loss / (6, 120 (constant) × blowing efficiency 0.65)
"Total heat exchange efficiency" 80%
"Outside air conditions" Summer 32 ° C 60% (10 hours x 3 months), Winter 10 ° C 40% (10 hours x 3 months)
"Indoor conditions" Summer 24 ° C 50%, Winter 24 ° C 50%
“Kitchen exhaust” Summer 27 ° C 50%, Winter 27 ° C 50%
“Total working hours” 10 hours × 313 days = 3, 130 hours (number of working days 313 days)
“Annual processing air volume” 5,400 × 3, 130 = 16,902,000 kg / year * 5,400 is calculated by multiplying the displacement of 4,500 m ³ / h with the specific gravity of air “Water usage cost” Charge = 400 yen "Electricity bill" 14 yen / kWh
“Oil mist filter” 900 m ³ / h treatment type: 2,000 yen / piece (cleaning regeneration fee), frequency 6 times / year “Deodorization filter” 900 m ³ / h treatment type: 100,000 yen / piece, life 6 months

<Example of heat recovery calculation>
"Summer 32 ° C 60% (3 months): Total heat exchange"
Kitchen displacement: 3 m × 10 m × 2.5 m × 60 times = 4, 500 m ³ / h = 5, 400 kg / h
Indoor kitchen exhaust: 27 ° C 50% → 20.5 ° C 85%
* Heat recovery amount based on operation results of JP-A-9-239224 (trade name T-GET): 5, 400 × 4.3 kcal / kg = 23, 220 kcal / h
* 5,400 is calculated by multiplying the displacement of 4,500m ³ / h with the specific gravity of air. Annual recovery amount: 23, 220 × 10h / day × 77day / y = 17, 900Mcal / y
* 77day is 3 months (90 days) excluding the interim period. Annual cost (saving annual cost): 17, 900 Mcal / y x 5 yen / Mcal = 89, 500 yen / year (1)
* 5 yen is the heat source unit price Winter: 10 ° C 50% (3 months): Total heat exchange indoor kitchen exhaust: 27 ° C 50% → 20.5 ° C 85%
* Heat recovery amount based on operation results of JP-A-9-239224 (trade name T-GET): 5, 400 × 9.1 kcal / kg = 49, 100 kcal / h
Annual collection amount: 49, 100 × 10 h / day × 77 day / y = 37, 880 Mcal / y
* 77day is 3 months (90 days) excluding the interim period. Annual cost (saving annual cost): 37,880 Mcal / y × 4 yen / Mcal = 151, 200 yen / year (2)
* 4 yen is the heat source unit price “Usage amount” humidification loss: 16, 902 × 0.002 = 34t, Drainage amount: 16,902 × 0.003 = 51t, (34 + 51) × 400 yen = 34,000 yen / year… (3)
※ estimated from the operational experience of JP-A-9-239224 (trade name T-GET), humidification loss, drainage amount is multiplied by loss per air 1m ³ (absolute humidity) in annual processing air volume (in terms of t).
“Blower power cost” 4,500 × 70 mmAq / (367, 200 × 0.65) × 10h × 313 day × 14 yen / kwh = 57, 800 yen / year (4)
* 367 and 200 are the above-mentioned constant 6120 converted to hourly (× 60) “Water supply power cost” 0.4 kwh × 3, 130 h × 14 yen = 17,500 yen / year (5)
"Total heat exchanger replacement cost + eliminator replacement cost" = 200,000 yen / year (6)
“Decomposition bacteria cost” 5,000 yen × 12 months = 60,000 yen / year (7)
“Conventional oil mist removal + deodorization cost” 10,000 × 6 times + 100,000 × 5 × 2 times = 1,060,000 yen / year (8)
* 10,000 is for 5 oil mist filters, 5 is 5500mm ³ / h, so 5 times "conventional oil mist removal (filter)" 60,000 yen / year (9)

"Running cost comparison (not including initial cost)"
Deodorization + Decomposition + Heat recovery (3) + (4) + (5) + (6) + (7)-(1)-(2) = 69,000 yen / year Same as above (4) + (8) = 1,118,000 yen / year without deodorization (4) '((4) × 40/70) + (9) = 93,000 yen / year * (4)' is in parentheses ((4) × 40/70). 40/70 is due to a decrease in the static pressure of the deodorizing filter.

It is explanatory drawing of a structure of the exhaust gas purification system concerning embodiment of this invention. FIG. 4 is a configuration explanatory diagram of a cleaning water purification and regeneration unit. FIG. 4 is a configuration explanatory diagram of a cleaning water purification and regeneration unit. FIG. 4 is a configuration explanatory diagram of a cleaning water purification and regeneration unit. It is explanatory drawing of the exhaust gas purification means of a structure different from FIG. It is explanatory drawing of the exhaust gas purification means of a structure different from FIG. It is explanatory drawing of the exhaust gas purification means of a structure different from FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust purification system a Washing water EA Exhaust OA Outside air RA Return air 10 Supply air duct 11 Air conditioner 13 Outside air direct duct 14 Outside air branch duct 15 Check damper 16, 37 Fan 17, 80, 81 Opening / closing damper (volume damper)
18 Heat exchanger 23 Control means 25, 38 Temperature sensor 30 Exhaust duct 31 Exhaust purification means 35 Eliminator 36 Nozzle 39 Drain container 50 Washing water purification regeneration means 75 Exhaust direct duct 76 Exhaust branch duct

Claims (8)

A system for purifying exhaust containing malodorous components exhausted from an air-conditioned space,
The air-conditioned space is a kitchen facility or a toilet.
Exhaust purification means for absorbing malodorous components in the exhaust gas into the cleaning water by mass transfer, cleaning water purification and regeneration means for purifying and regenerating cleaning water contaminated by the mass transfer, and exhaust gas after being purified by the exhaust purification means With heat recovery means that can exchange heat with the outside air supplied to the air-conditioned space,
Outside air direct path for supplying air conditioning space without heat exchange of intake outside air and / or exhaust exhaust path for exhausting air from air conditioning space without heat exchange, outside air branch path for introducing intake outside air to heat recovery means, and exhaust After the exhaust gas purifying means purifies the exhaust branch path through which the heat recovery means is introduced and the flow rate of intake outside air flowing through the outside air direct path and the outside air branch path and / or the flow rate of exhaust gas flowing through the exhaust direct path and the exhaust branch path An exhaust purification system comprising control means for controlling both the exhaust gas temperature and the outside air temperature based on the outside air temperature or the outside air temperature. A system for purifying exhaust containing malodorous components exhausted from an air-conditioned space,
The air-conditioned space is a kitchen facility or a toilet.
Exhaust purification means for absorbing malodorous components in the exhaust into the wash water by mass transfer, and heat recovery means capable of exchanging heat with the outside air supplied to the air-conditioned space after being purified by the exhaust purification means Prepared,
Outside air direct path for supplying air conditioning space without heat exchange of intake outside air and / or exhaust exhaust path for exhausting air from air conditioning space without heat exchange, outside air branch path for introducing intake outside air to heat recovery means, and exhaust After the exhaust gas purifying means purifies the exhaust branch path through which the heat recovery means is introduced and the flow rate of intake outside air flowing through the outside air direct path and the outside air branch path and / or the flow rate of exhaust gas flowing through the exhaust direct path and the exhaust branch path An exhaust purification system comprising control means for controlling both the exhaust gas temperature and the outside air temperature based on the outside air temperature or the outside air temperature.   The exhaust purification system according to claim 1 or 2, wherein the heat recovery means is a sensible heat exchanger.   The exhaust purification system according to any one of claims 1 to 3, further comprising a drain container that receives the wash water that has flowed down, wherein the wash water in the drain container is circulated and supplied to a nozzle of the exhaust purification means.   The exhaust gas purification system according to any one of claims 1 to 4, wherein ozone gas is injected into the wash water.   The exhaust gas purification system according to any one of claims 1 to 5, wherein a direct path to outside air is omitted. The exhaust gas purification system according to any one of claims 1 to 5 , wherein an exhaust direct path is omitted. An exhaust purification method using the exhaust purification system according to claim 1,
If the exhaust temperature after being purified by the exhaust purification means is lower than the outside air temperature, or if the exhaust temperature after being purified by the exhaust purification means is higher than the outside air temperature, the outside air is supplied to the outside air branch path and the exhaust branch An exhaust gas purification method comprising supplying exhaust gas to a path.

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