JP7158095B2 - Thermal storage combustion deodorizer - Google Patents

Description

The present invention relates to a regenerative combustion deodorizing device and a method of operating the regenerative combustion deodorizing device. More specifically, the present invention relates to a regenerative combustion deodorizing device and a method of operating the regenerative combustion deodorizing device, which is compact in structure and excellent in workability and capable of improving the decomposition efficiency of organic substances in the gas to be treated.

At factories that handle chemical products such as electrophotographic toner, synthetic resins, paints, pigments, pharmaceuticals, and industrial chemicals, treated gases containing volatile organic compounds (VOCs) such as ethyl acetate, toluene, xylene, and styrene are known to occur in large numbers. Such VOC-containing gas reacts with NOx to generate photochemical smog, and increases ozone, which is the main component of photochemical oxidants, in the troposphere, thereby contributing to global warming. Furthermore, since these VOC-containing gases contain carcinogenic substances, they are known to cause health problems to the human body even at low concentrations.

Therefore, in various factories and the like, VOC-containing gases are detoxified and discharged into the atmosphere. Treatment methods for detoxifying VOC-containing gases include direct combustion, catalytic combustion, heat storage combustion, biological treatment, and the like. Among these, the heat storage combustion method has the advantage of high heat recovery efficiency, so in various factories, regenerative thermal oxidizers (RTO) that employ this heat storage combustion method are widely used.

In this regenerative combustion deodorizing apparatus, an untreated VOC-containing gas (hereinafter referred to as "treated gas") is circulated through a heat storage material to preheat it, and then introduced into a furnace to burn the treated gas in a combustion chamber. The treated gas that has been detoxified and has a high temperature (hereinafter referred to as "exhaust gas") is again circulated through the heat storage material to store the heat, and the stored heat is used when the low temperature gas to be treated flows. Heat is radiated again for heat exchange.

Regenerative combustion deodorizers are broadly classified into switching types and rotary types. Switching types include two-tower, three-tower, or four-tower or more types depending on the number of heat storage chambers. Combustion deodorizers are widely used due to their low running costs and ease of maintenance compared to rotary deodorizers. For example, Patent Literature 1 and Patent Literature 2 disclose three-tower regenerative combustion deodorizing devices.

In this three-tower type regenerative combustion deodorizing apparatus, the gas to be treated is supplied to the combustion chamber through the first regenerative chamber in which heat is stored in the preceding process, is combusted by the burner, and is combusted through the second regenerative chamber. The high-temperature exhaust gas is exhausted, heat is stored in the heat storage material, and part of the exhaust gas is passed through the third heat storage chamber to remove the gas to be treated remaining in the heat storage material and piping of the heat storage chamber, so-called purge processing. is done.

By operating the switching valve installed in the pipe communicating with each heat storage chamber, the operation is continued while sequentially switching the three operation cycles of air supply, exhaust, and purge for each heat storage chamber at predetermined time intervals. As a result, the gas to be treated can be oxidatively decomposed and deodorized in the combustion chamber, and the thermal efficiency can be enhanced by preheating and heat recovery using the heat storage medium.

JP 2011-102664 A JP 2016-217620 A

By the way, in the three-tower switchable regenerative combustion deodorizing device or rotary regenerative combustion deodorizing device disclosed in Patent Documents 1 and 2, it is necessary to provide a plurality of regenerative chambers and accessories. However, there is a problem that the apparatus as a whole becomes large in size, requiring an installation site of a certain size, and in constructing the apparatus, a large-scale construction work is required at the installation site, resulting in an increase in construction cost.

On the other hand, among the switching type regenerative combustion deodorizing devices, the two-tower type has a relatively compact structure and does not require a very large installation space. In addition, the equipment can be installed by dividing it into multiple units and performing simple assembly work at the installation site, so construction costs can be reduced compared to other switching or rotating heat storage combustion deodorizing equipment. can do.

However, in the two-tower type regenerative combustion deodorizing device, the gas to be treated that remains in the regenerator flows backward and is released into the atmosphere for an extremely short time when the switching valve is actuated, or the limit value of the air flow for treatment is low. , the decomposition rate of the gas to be treated is inferior to that of a three-tower or multi-tower regenerative combustion deodorizing apparatus.

The present invention has been invented in view of the above points, and has excellent workability due to its compact structure, and is capable of improving the decomposition efficiency of organic matter in the gas to be treated, and a heat storage combustion deodorizing device. The object is to provide a method of operating the device.

In order to achieve the above object, the regenerative combustion deodorizing apparatus of the present invention has a combustion chamber for thermally decomposing a gas to be treated, a heat storage medium communicating with the combustion chamber, and A heat storage area composed of a plurality of heat storage chambers divided into n chambers (n is an integer equal to or greater than 5) in series, and connected to each heat storage chamber in the heat storage area to supply the gas to be treated to the combustion chamber. an air supply flow path connected to each heat storage chamber in the heat storage area and exhausting exhaust gas that has been thermally decomposed in the combustion chamber; and an exhaust flow path connected to each heat storage chamber in the heat storage area and remaining in the heat storage area. and a plurality of heat storage chambers that are in communication with the air supply flow path in one operation process. a second group composed of the same number of heat storage chambers as the first group, and a heat storage chamber different from the first group and the second group, in which the purge flow path communicates a switching mechanism for performing switching control to a third group composed of a smaller number of heat storage chambers than the first group to be in the state.

Here, since the heat storage combustion deodorizing device is provided with a combustion chamber for thermally decomposing the gas to be treated, the gas to be treated containing an organic solvent and an odorous component is maintained at a temperature equal to or higher than the ignition point of the odorous component for a residence time of at least a certain level. By providing it, the organic solvent and odor components can be oxidatively decomposed and rendered harmless.

In addition, by providing a heat storage region that communicates with the combustion chamber and is formed of a plurality of heat storage chambers divided (multiple) into n chambers (n is an integer of 5 or more) in series in one tower, heat storage Since the area is a single-tower multi-chamber type with a plurality of heat storage chambers in one tower, it is possible to select an arbitrary heat storage chamber and carry out each step of air supply, exhaust, and purge. Therefore, compared with conventional multi-tower multi-chamber devices, the entire device can be made smaller, can be installed in a space-saving space, and does not require large-scale construction work when assembling the device.

Further, by having a heat storage body inside the heat storage chamber, the heat storage body can be used as a heat exchanger. That is, in the previous operation process, the temperature of the heat storage medium is raised by the high-temperature exhaust gas discharged from the combustion chamber, and in the next operation process, the gas to be treated is passed through the heat storage medium whose temperature has been raised. can increase the efficiency of pyrolysis in By sequentially switching the operation cycle in this way, the heat exchange efficiency of the entire apparatus can be improved and the running cost can be reduced.

In addition, by providing an air supply passage for supplying the gas to be treated to the combustion chamber, which is connected to each heat storage chamber in the heat storage area, the gas to be treated can be supplied from the air supply passage to the combustion chamber through the heat storage chamber. can. At this time, the gas to be treated receives heat from the heat storage medium, the temperature of which has been raised in the previous operating process, and is supplied to the combustion chamber after being heated to some extent, thereby increasing the efficiency of thermal decomposition in the combustion chamber. be able to.

In addition, by providing an exhaust passage that is connected to each heat storage chamber in the heat storage area and exhausts the exhaust gas that has been thermally decomposed in the combustion chamber, the exhaust gas that has been detoxified in the combustion chamber is released to the atmosphere through the exhaust passage. be able to. At this time, the temperature of the heat storage element can be increased by receiving heat from the high-temperature exhaust gas. Therefore, in the next operation step, the temperature of the gas to be treated is raised to a predetermined temperature by passing the gas to be treated, which has a low temperature, through the heat storage element whose temperature has been raised, thereby increasing the efficiency of thermal decomposition in the combustion chamber. can be done.

In addition, by providing a purge flow path connected to each heat storage chamber of the heat storage area and purging the gas to be treated remaining in the heat storage area, the purge gas is supplied toward the combustion chamber or the air supply flow path, whereby the heat storage body It is possible to remove the gas to be treated containing the organic compound remaining in the gas.

Further, by providing a switching mechanism capable of switching and controlling the state of communication between each heat storage chamber and the air supply channel, the exhaust channel, and the purge channel, the channel can be freely selected according to the operation cycle. Therefore, the heat storage chamber through which the gas to be treated supplied to the combustion chamber passes and the heat storage chamber through which the exhaust gas discharged from the combustion chamber passes can be sequentially switched in accordance with the operating process. By uniformizing the temperature and the concentration of the residual gas to be treated, the apparatus can be stably operated.

Furthermore, since the heat storage chamber and each flow path, which have a small volume due to the multi-chamberization, are connected to each other, when using an on-off valve, for example, as a switching mechanism for switching the flow path can reduce pressure fluctuations that occur when opening and closing the on-off valve. Therefore, it is possible to prevent gas leakage or the like that occurs when the flow path is switched.

In one operation process, the switching mechanism includes a first group composed of a plurality of heat storage chambers in which the air supply passages are in communication, and a heat storage chamber different from the first group and in which the exhaust passages are in communication. By performing switching control so as to configure the second group composed of the same number of heat storage chambers as the first group, the amount of the gas to be treated supplied to the combustion chamber and the amount of exhaust gas exhausted from the combustion chamber are uniform. As a result, the supply and exhaust operation can be stably performed.

Further, the switching mechanism constitutes a third group composed of heat storage chambers different from the first group and the second group and having a smaller number of heat storage chambers than the first group in which the purge passages are in communication. By performing switching control in this manner, it is possible to prevent the gas to be treated remaining in the heat storage medium from being discharged to the atmosphere as it is.

At this time, since the number of heat storage chambers constituting the third group is smaller than the number of heat storage chambers constituting the first and second groups, the purge ratio with respect to the volume of supply air and exhaust gas should be relatively small. can be done. Therefore, since the purge flow rate can be reduced, the volume of the purge flow path can be reduced, and the entire apparatus can be made compact.

In addition, when the first group and the second group are composed of (n−1)/2 (n is an odd number equal to or greater than 5) heat storage chambers, and the third group is composed of one heat storage chamber, For example, when the heat storage area is composed of nine heat storage chambers, the air supply flow path, the exhaust flow path, and the purge flow path are arranged in the respective heat storage chambers at a ratio of 4:4:1 in one operation cycle. connected to. Therefore, as the total number of heat storage chambers increases, the ratio of the heat storage chambers for purging to the heat storage chambers for air supply and exhaust becomes smaller, and the overall size of the apparatus can be reduced.

That is, in the conventional multi-tower multi-chamber system, the ratio of the number of heat storage chambers connected to the air supply flow path, the exhaust flow path, and the purge flow path was 1:1:1. The number of heat storage chambers and the number of heat storage chambers to be purged were the same. Therefore, it is necessary to secure a certain volume for the purge channel, which causes the overall size of the device to increase. It is possible to plan.

Further, the switching control by the switching mechanism in one operating process is performed when selecting a predetermined heat storage chamber to which the air supply channel was connected in the operating process one step before the one operating process and connecting it to the purge channel. When the gas to be treated, which is supplied from the air supply passage, passes through the heat storage chamber, the gas to be treated remaining in the heat storage medium can be recirculated to either the combustion chamber or the air supply passage by the purge gas. . Therefore, even if the switching mechanism is switched and the exhaust passage is connected to the heat storage chamber, it is possible to prevent the undecomposed gas to be treated remaining in the heat storage body from being released to the atmosphere.

Further, the switching control by the switching mechanism in one operating process selects a predetermined heat storage chamber to which the purge channel was connected in the operating process one step before the one operating process, and connects it to the exhaust channel. When one of the chambers is used, the exhaust flow path is connected to the heat storage chamber from which the gas to be treated remaining in the heat storage medium has been purged in the previous operation step. It is possible to prevent the remaining gas to be treated from being released into the atmosphere without being decomposed.

Further, the switching control by the switching mechanism in one operating process selects a predetermined heat storage chamber to which the exhaust flow path has been connected in the operating process one step before the one operating process, and connects it to the air supply flow path. In the case of one of the chambers, the gas to be treated is supplied to the combustion chamber through a heat storage chamber having a heat storage medium that receives heat from the exhaust gas and has a high temperature due to the passage of the high temperature exhaust gas in the previous operation process. can care Therefore, the temperature of the gas to be treated can be raised to a predetermined value, so that the thermal decomposition of the gas to be treated in the combustion chamber can be promoted.

Further, when the air supply passage has an air supply fan for supplying the gas to be processed, and the purge passage extracts the exhaust gas from the combustion chamber and circulates it upstream of the air supply fan, By adopting a suction method as a purging method in which the gas is recirculated from the combustion chamber to the supply air passage through the purge passage, it is possible to uniformly purge the gas to be treated remaining in the heat storage medium even in a narrow space.

In order to achieve the above object, a method for operating a regenerative combustion deodorizing apparatus of the present invention communicates with a combustion chamber that thermally decomposes a gas to be treated, has a heat storage medium therein, and a first step in which the gas to be treated passes through a first group composed of a plurality of heat storage chambers among a plurality of heat storage chambers divided into n chambers (n is an integer equal to or greater than 5); a second step of thermally decomposing the gas to be treated that has passed through the gas in the combustion chamber; a third step in which the exhaust gas generated by the thermal decomposition passes through the second group; and heat storage chambers different from the first group and the second group, the number of which being smaller than that of the first group. and a fourth step in which the purge gas passes through a third group consisting of:

Here, by providing the first step in which the gas to be treated passes through the first group composed of a plurality of heat storage chambers, the multi-chambered heat storage region is composed of a predetermined number of heat storage chambers. The gas to be treated can be supplied to the combustion chamber through the first group.

Further, by providing the second step of thermally decomposing the gas to be treated that has passed through the first group in the combustion chamber, the organic components contained in the gas to be treated are decomposed harmlessly by thermally decomposing the gas to be treated in the combustion chamber. and can remove odors.

In addition, a third step in which the exhaust gas generated by thermal decomposition passes through a second group composed of heat storage chambers different from the heat storage chambers constituting the first group and composed of the same number of heat storage chambers as the first group. By providing, it is possible to equalize the gas volumes of the air supply and the exhaust, and to perform the air supply and exhaust operation stably.

Further, the exhaust gas heated to a high temperature by being thermally decomposed in the combustion chamber is exhausted through the heat storage chambers constituting the second group, so that the heat storage body in the heat storage chamber receives heat through the exhaust gas, thereby raising the temperature of the heat storage body. can be done. Therefore, in the next operation step, the gas to be treated passes through all or part of the heat storage chambers that constitute the second group, so that the temperature of the gas to be treated can be raised to a predetermined level. Decomposition efficiency can be increased.

In addition, a fourth step of passing the purge gas through a third group of heat storage chambers different from the first group and the second group and composed of a smaller number of heat storage chambers than the first group and the second group is provided. By purging the gas to be treated remaining in the heat storage elements of the heat storage chambers constituting the third group, it is possible to prevent the gas to be treated from being released into the atmosphere in an undecomposed state.

Further, when the first to fourth processes are set as one operation process and all or part of the heat storage chambers constituting the first to third groups are sequentially switched for each operation process, the heat storage area is configured. Since each heat storage chamber is sequentially switched to each step of air supply, exhaust, and purge, the ability to decompose the gas to be treated in the apparatus can be made uniform.

INDUSTRIAL APPLICABILITY The thermal storage combustion deodorizing device and the operation method of the thermal storage combustion deodorizing device according to the present invention are excellent in workability due to their compact structure, and can improve the decomposition efficiency of organic substances in the gas to be treated.

1 is a schematic diagram of a regenerative combustion deodorizing device according to an embodiment of the present invention; FIG. 1 is a partial cross-sectional front view of a regenerative combustion deodorizing device according to an embodiment of the present invention; FIG. 1 is a partial cross-sectional side view of a regenerative combustion deodorizing device according to an embodiment of the present invention; FIG. FIG. 2 is a diagram showing gas flow in the regenerative combustion deodorizing device according to the embodiment of the present invention; 1 is a schematic diagram showing an operation mode of Example 1 of a regenerative combustion deodorizing device according to an embodiment of the present invention; FIG. FIG. 4 is a schematic diagram showing an operation mode of Example 2 of the regenerative combustion deodorizing device according to the embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention relating to a regenerative combustion deodorizing device and a method of operating the regenerative combustion deodorizing device will be described with reference to the drawings for understanding of the present invention. In the following description, the gas to be processed, the exhaust gas, and the purge gas are collectively defined as "gas". In addition, when the heat storage combustion deodorizing device is installed, the upward direction from the installation surface is the upward direction, the opposite direction to the upward direction is the downward direction, and the axial direction represented by the upward and downward directions is the vertical direction. The vertical axis direction is defined as the horizontal direction, respectively.

First, a heat storage combustion deodorizing device 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. As shown in FIGS. 1 to 3, the regenerative combustion deodorizing apparatus 1 includes a combustion chamber 40 for thermally decomposing the gas to be treated, and seven heat storage chambers communicating with the combustion chamber 40 and each containing a heat storage medium 12. A heat storage area 10 consisting of chambers 11 (11A to 11G), an air supply passage 50 that communicates with an air supply fan 20 and supplies a gas to be processed supplied from a gas supply source (not shown) to the combustion chamber 40, An exhaust passage 60 for exhausting the treated exhaust gas thermally decomposed (oxidatively decomposed) in the combustion chamber 40 to the atmosphere, and a part of the treated gas after completion of combustion is sucked from the combustion chamber 40 as purge gas by the purge blower 30. and a purge passage 70 for recirculating the air to the upstream side of the air supply fan 20 .

Here, the heat storage chamber 11 forming the heat storage area 10 does not necessarily have to be composed of the seven heat storage chambers 11A to 11G. In the embodiment of the present invention, the heat storage chambers 11 may be composed of at least five heat storage chambers, more preferably five or more odd heat storage chambers 11 . For convenience of explanation, the following description will be based on the heat storage chamber 11 having a configuration of 7 or 9 chambers disclosed in the drawings.

Also, the purge flow path 70 does not necessarily have to be of a suction type in which a part of the exhaust gas in the combustion chamber 40 is sucked by the purge blower 30 . In the embodiment of the present invention, a suction method is adopted that can uniformly purge the gas to be treated that remains inside the heat storage element 12 even in a narrow space. method may be adopted.

A burner 41 is provided in the combustion chamber 40 . A fuel supply path 43 is connected to the burner 41 through a fuel opening/closing valve 42 to supply LNG as a fuel for driving the burner 41 . Further, the combustion chamber 40 is provided with a plurality of temperature sensors (not shown) for detecting the temperature inside the combustion chamber 40, and based on the signals from the temperature sensors, the fuel opening/closing valve 42 of the fuel supply passage 43 is controlled. , the flow rate of the fuel supplied to the burner 41 can be changed.

The heat storage chambers 11 constituting the heat storage region 10 are each of the same volume, and the adjacent heat storage chambers 11 are spaced apart so that the gas passing through the heat storage region 10 does not affect the adjacent heat storage chambers 11 It is partitioned by a partition plate 13 having heat resistance.

The heat accumulator 12 (12A to 12G) built in the heat accumulating chamber 11 is composed of a ceramic honeycomb structure laminated in multiple stages. It can be appropriately adopted from a known structure such as a laminated structure, or a structure in which a plurality of ceramic or metal pipes are cut to a predetermined length.

The air supply channel 50, the exhaust channel 60, and the purge channel 70 are formed along the length direction of the heat storage combustion deodorizing device 1 in a space formed below the heat storage area 10, and are purged in plan view. The air supply channel 50 and the exhaust channel 60 are arranged on one side and the other side of the channel 70, respectively.

The heat storage chamber 11 and the air supply passage 50 are connected through air supply switching valves 51 (51A to 51G), and the heat storage chamber 11 and the exhaust passage 60 are connected through exhaust switching valves 61 (61A to 61G). ing. The air supply switching valve 51 and the exhaust switching valve 61 are composed of, for example, a substantially circular valve body when viewed from the front and a valve shaft connected to a substantially central portion of the valve body. By reciprocating along the axial direction of the valve shaft, the air supply channel 50 and the heat storage region 10, and the exhaust channel 60 and the heat storage region 10 can be switched between a communicating state and a non-communicating state, respectively. .

When the gas to be treated is supplied to the heat storage chamber 11 from the air supply passage 50, the gas to be treated flows into the heat storage chamber 11 through a gap formed by moving the air supply switching valve 51 in the opening direction. Then, the air is supplied to the combustion chamber 40 (Fig. 4a). On the other hand, when the exhaust gas is released from the combustion chamber 40 to the atmosphere, the exhaust gas that has passed through the heat storage chamber 11 from the combustion chamber 40 through the gap formed by moving the exhaust switching valve 61 in the opening direction. is released to the atmosphere through exhaust channel 60 (FIG. 4c).

As shown in FIG. 1, each heat storage chamber 11 and the purge passage 70 are connected via a purge switching valve 71 (71A to 71G). The purge switching valve 71 may employ, for example, a check valve that moves in the opening direction when the purge pressure from the combustion chamber 40 acts. As a result, the purge switching valve 71 can be controlled to open only when purging is required, thereby preventing backflow from the air supply passage 50 or the exhaust passage 60 to the combustion chamber.

Here, the air supply switching valve 51, the exhaust switching valve 61, and the purge switching valve 71 are not necessarily limited to the forms described above, and can be appropriately selected from known switching valves.

The regenerative combustion deodorizing apparatus 1 configured as described above operates mainly in one cycle of the air supply mode, the purge mode, and the exhaust mode. Of the heat storage chambers 11, three arbitrary heat storage chambers are assigned to the air supply mode and the exhaust mode, respectively, and the remaining one arbitrary heat storage chamber is assigned to the purge mode, and the heat storage chambers assigned to each mode are sequentially assigned. Drive while switching.

Here, by setting the same number of heat storage chambers to be assigned to the air supply mode and the exhaust mode, the amount of air supply and the amount of exhaust are uniform, so that the gas to be treated can be efficiently thermally decomposed. Further, the number of heat storage chambers assigned to the purge mode is reduced compared to the number of heat storage chambers assigned to the air supply mode and the exhaust mode, so that the minimum required volume of the purge flow path can be secured.

That is, in the conventional multi-tower, for example, three-tower, regenerative combustion deodorizing apparatus, each tower is operated while sequentially switching between an air supply mode, an exhaust mode, and a purge mode. could not be made relatively smaller than the volume of the heat storage chamber assigned to the air supply mode or the exhaust mode (that is, the volume of the heat storage chamber assigned to all modes was the same). For this reason, it is necessary to secure a certain volume for the purge channel as well as for the air supply channel and the exhaust channel, which has been a factor in increasing the size of the entire apparatus.

On the other hand, in the regenerative combustion deodorizing device 1 according to the embodiment of the present invention, a plurality of regenerative chambers 11 are arranged in one tower so as to supply the number of regenerative chambers 11 allocated to the purge mode. It can be relatively small for the heat storage chambers 11 assigned to the gas mode and the exhaust mode.

Therefore, as shown in FIG. 3, the shape of the purge flow path 70 can be adjusted to match the size of the heat storage chamber 11 at the top and tapered toward the bottom to reduce the volume. The degree of freedom in designing the air flow path 50 and the exhaust flow path 60 is increased, and the entire heat storage combustion deodorizing device 1 can be made compact. Even if only one heat storage chamber 11 is assigned to the purge mode, the heat storage chamber 11 assigned to the purge mode is sequentially switched for each operation cycle, as will be described later. Therefore, since all the heat storage chambers 11 are purged once throughout the operation cycle, there is no fear that the gas to be treated remaining in the heat storage body 12 will be released to the atmosphere as it is.

A specific operating method of the regenerative combustion deodorizing device 1 according to the embodiment of the present invention will be described below. It should be noted that the heat storage combustion deodorizing apparatus 1 having nine (11A to 11I) multi-chambers as the heat storage chambers 11 described in the following embodiments will be described.

<Example 1>
First, FIG. 5 is a conceptual diagram showing operation modes according to the first embodiment of the heat storage combustion deodorizing device 1, and Table 1 is a table showing the state of the switching valve in each operation mode (o is open, x is closed). In the operation mode of the first embodiment, the heat storage chamber 11 consisting of four adjacent chambers is assigned to the air supply mode and the exhaust mode, respectively, and the remaining one chamber is assigned to the purge mode heat storage chamber.

First, in the first operation cycle (Step 1) shown in FIG. 5( a ), in the heat storage region 10 in the air supply mode, the exhaust gas has passed through the heat storage medium 12 in the previous operation cycle and the heat storage medium 12 has reached a high temperature. The four chambers 11, for example, heat storage chambers 11F to 11I, are selected as the first group. At this time, the air supply switching valves 51F to 51I are "open", the air supply switching valves 51A to 51E are "closed", the exhaust switching valves 61A to 61I are "closed", and the purge switching valves 71A to 71I are "closed". The gas to be treated is supplied to the heat storage chambers 11F to 11I which are switched to closed and are in communication with the air supply passage 50 . The gas to be treated that has passed through the heat storage chambers 11F to 11I is supplied to the combustion chamber 40 after receiving heat from the heat storage body 12 and being heated. The gas to be treated supplied to the combustion chamber 40 is heated to a high temperature by the burner 41 to thermally decompose organic compounds and odors contained in the gas to be treated.

In the exhaust mode, of the heat storage area 10, the heat storage chambers 11 that have been purged in the previous operation cycle and whose temperature has decreased due to the passage of the gas to be treated, for example, the four heat storage chambers 11A to 11D are selected as the second group. be. At this time, the exhaust switching valves 61A to 61D corresponding to the heat storage chambers 11A to 11D are "open", the air supply switching valves 51A to 51I and the exhaust switching valves 61E to 61I are "closed", and the purge switching valves 71A to 61I are "closed". 71I is switched to "closed", and the exhaust gas is discharged from the combustion chamber 40 to the heat storage chambers 11A to 11D. Exhaust gas discharged from the combustion chamber 40 passes through the heat storage chambers 11A to 11D and is released to the atmosphere through an exhaust passage 60 that is in communication with the heat storage chambers 11A to 11D. At this time, the heat accumulator is heated up to a constant temperature by receiving heat from the high-temperature exhaust gas.

In the purge mode, among the heat storage areas 10, a heat storage chamber through which the gas to be treated has passed in the previous operation cycle and remains therein, for example, one of the heat storage chambers 11E is selected as the third group. At this time, the corresponding purge switch valve 71E is "open", and the air supply switch valves 51A-51I, exhaust switch valves 61A-61I, and purge switch valves 71A-71D, 71F-71I are switched "closed". A part of the controlled exhaust gas supplied from the combustion chamber 40 passes through the heat storage chamber 11E, and passes through the purge flow path 70 communicating with the heat storage chamber 11E together with the gas to be treated remaining in the heat storage medium 12E. , is circulated upstream of the air supply fan 20 in the air supply passage 50 and is supplied to the combustion chamber 40 again.

As the first operation cycle, when the series of cycles of the air supply mode, the exhaust mode, and the purge mode are completed, the switching valve is switched and controlled to shift to the next operation cycle, the second operation cycle. FIG. 5(b) shows the state of connection between the heat storage area 10, the air supply channel 50, the exhaust channel 60, and the purge channel 70 in the second operation cycle.

As shown in FIG. 5B, in the air supply mode of the second operation cycle (Step 2), the heat storage chambers 11G to 11I are maintained in the air supply mode as they were in the first operation cycle. On the other hand, the heat storage chamber 11A, which was in the exhaust mode in the first operation cycle, switches to the air supply mode instead of the heat storage chamber 11F, which is in a low temperature state due to the repeated passage of the gas to be treated. That is, in the second operation cycle, the heat storage chamber 11A and the heat storage chambers 11G to 11I constitute the first group as the air supply mode.

In the exhaust mode, the heat storage chambers 11B to 11D of the heat storage area 10 are maintained in the exhaust mode in the first operation cycle. On the other hand, instead of the heat storage chamber 11A switched to the air supply mode, the heat storage chamber 11E constitutes the second group in the exhaust mode. Since the heat storage chamber 11E was in the purge mode in the first operation cycle, the gas to be treated remaining in the heat storage body 12E is purged. Therefore, it is possible to prevent the residual gas in the heat storage element 12E from being released to the atmosphere by the exhaust gas passing through the heat storage chamber 11E.

In the purge mode, the heat storage chambers 11F that were in the air supply mode in the first operation cycle constitute the third group. That is, a large amount of the gas to be treated remains in the heat accumulator 12F due to repeated passage of the gas to be treated in the previous operation cycle. Therefore, in the second operation cycle, the remaining gas to be treated can be purged by switching the heat storage chamber 11F to the purge mode.

As described above, in the air supply mode of the second operation cycle, the air supply switching valves 51A, 51G to 51I corresponding to the heat storage chambers 11A, 11G to 11I are "open", and the air supply switching valves 51B to 51F are open. is "closed", the exhaust switching valves 61A to 61I are "closed", and the purge switching valves 71A to 71I are "closed".

In the exhaust mode of the second operation cycle, the exhaust switching valves 61B to 61E corresponding to the heat storage chambers 11B to 11E are "open", the air supply switching valves 51A to 51I are "closed", and the exhaust switching valve 61A and 61F to 61I are controlled to be "closed", and the purge switching valves 71A to 71I are controlled to be "closed".

Furthermore, in the purge mode in the second operation cycle, the purge switching valve 71F corresponding to the heat storage chamber 11F is "open", the air supply switching valves 51A to 51I, the exhaust switching valves 61A to 61I, the purge switching valves 71A to 71E and 71G to 71I are controlled to be "closed".

As the second operation cycle, when the series of cycles of the air supply mode, the exhaust mode, and the purge mode are completed, the switching valve is switched and controlled to shift to the next operation cycle, the third operation cycle. FIG. 5(c) shows the state of connection between the heat storage area 10, the air supply channel 50, the exhaust channel 60, and the purge channel 70 in the third operation cycle.

As shown in FIG. 5(c), in the air supply mode of the third operation cycle (Step 3), the heat storage chambers 11A, 11H, and 11I are maintained in the air supply mode in the second operation cycle. On the other hand, the heat storage chamber 11B, which was in the exhaust mode in the third operation cycle, switches to the air supply mode instead of the heat storage chamber 11G, which has been in a low temperature state due to the repeated passage of the gas to be treated. That is, in the third operation cycle, the heat storage chambers 11A, 11B, 11H, and 11I constitute the first group in the air supply mode.

In the exhaust mode, the heat storage chambers 11C to 11E form the second group in the second operation cycle. On the other hand, instead of the heat storage chamber 11B switched to the air supply mode, the heat storage chamber 11F is in the exhaust mode and constitutes the second group. Since the heat storage chamber 11F was in the purge mode in the second operation cycle, the gas to be treated remaining in the heat storage body 12F is purged. Therefore, it is possible to prevent the residual gas in the heat storage element 12F from being released to the atmosphere by the exhaust gas passing through the heat storage chamber 11F.

The heat storage chamber 11G, which was in the air supply mode in the second operation cycle, constitutes the third group in the purge mode. That is, a large amount of the gas to be treated remains in the heat accumulator 12G due to repeated passage of the gas to be treated in the previous operation cycle. Therefore, in the third operation cycle, the remaining gas to be treated can be purged by switching the heat storage chamber 11G to the purge mode.

As described above, in the air supply mode of the third operation cycle, the air supply switching valves 51A, 51B, 51H, and 51I corresponding to the heat storage chambers 11A, 11B, 11H, and 11I are "open", and the air supply switching valves Switching control is performed so that the valves 51C-51G are "closed", the exhaust switching valves 61A-61I are "closed", and the purge switching valves 71A-71I are "closed".

Further, in the exhaust mode in the third operation cycle, the exhaust switching valves 61C to 61F corresponding to the heat storage chambers 11C to 11F are "open", the air supply switching valves 51A to 51I are "closed", and the exhaust switching valve 61A, 61B, 61G to 61I are controlled to be "closed", and the purge switching valves 71A to 71I are controlled to be "closed".

Furthermore, in the purge mode in the third operation cycle, the purge switching valve 71G corresponding to the heat storage chamber 11G is "open", the air supply switching valves 51A to 51I, the exhaust switching valves 61A to 61I, the purge switching valves 71A to 71F, 71H, and 71I are controlled to be "closed".

Since the operation is continued while the heat storage chambers constituting the air supply mode, the exhaust mode, and the purge mode are sequentially replaced one by one in the fourth and subsequent operation modes, the amount of air supply and exhaust is kept uniform and all heat storage is performed. The chambers can be purged sequentially at predetermined times.

[Table 1]

<Example 2>
FIG. 6 is a conceptual diagram showing operation modes according to the second embodiment of the heat storage combustion deodorizing apparatus 1, and Table 2 is a table showing the state of the switching valve (◯: open, x: closed) in each operation mode. In the operation mode of the first embodiment, the heat storage chambers 11 adjacent to each other are grouped and assigned to the air supply mode, the exhaust mode, and the purge mode. while operating in the air supply mode, the exhaust mode, and the purge mode.

First, in the first operation cycle (Step 1) shown in FIG. 6A, in the heat storage area 10 in the air supply mode, the heat storage chamber in which the exhaust gas has passed through in the previous operation cycle and the temperature of the heat storage medium is high. , for example, the four heat storage chambers 11A, 11D, 11F, and 11H are selected as the first group. At this time, the air supply switching valves 51A, 51D, 51F and 51H are "open", the air supply switching valves 51B, 51C, 51E, 51G and 51I are "closed", and the exhaust switching valves 61A to 61I are "closed". , the purge switching valves 71A to 71I are controlled to be closed, and the gas to be treated is supplied to the heat storage chambers 11A, 11D, 11F, and 11H communicating with the air supply passage 50 . The gas to be treated that has passed through the heat storage chambers 11A, 11D, 11F, and 11H is supplied to the combustion chamber 40 after receiving heat from the heat storage body 12 and being heated. The gas to be treated supplied to the combustion chamber 40 is heated to a high temperature by the burner 41 to thermally decompose organic compounds and odors contained in the gas to be treated.

In the exhaust mode, four heat storage chambers, such as heat storage chambers 11C, 11E, 11G, and 11I, which have been purged in the previous operation cycle and whose temperature has been lowered due to the passage of the gas to be treated, of the heat storage region 10 are grouped in the second group. is selected as At this time, the exhaust switching valves 61C, 61E, 61G, and 61I corresponding to the heat storage chambers 11C, 11E, 11G, and 11I are "open", the air supply switching valves 51A to 51I, the exhaust switching valves 61A, 61B, 61D, 61F and 61H are "closed", and the switching valves 71A to 71I for purge are controlled to be "closed". Exhaust gas discharged from the combustion chamber 40 passes through the heat storage chambers 11C, 11E, 11G, and 11I and is released to the atmosphere through an exhaust flow path 60 that is in communication with them. At this time, the temperature of the heat storage element 12 is raised to a constant temperature by receiving heat from the high-temperature exhaust gas.

In the purge mode, among the heat storage areas 10, the heat storage chamber through which the gas to be treated has passed in the previous operation cycle and remains therein, such as the heat storage chamber 11B, is selected as the third group. At this time, the corresponding purge switch valve 71B is "open", and the air supply switch valves 51A to 51I, the exhaust switch valves 61A to 61I, and the purge switch valves 71A, 71C to 71D are switch-controlled to "closed". , a part of the exhaust gas supplied from the combustion chamber 40 passes through the heat storage chamber 11B, passes through the purge flow path 70 which is in communication with the gas to be treated remaining in the heat storage medium 12B, and enters the air supply flow path 50. The air is circulated upstream of the air supply fan 20 and supplied to the combustion chamber 40 again.

As the first operation cycle, when the series of cycles of the air supply mode, the exhaust mode, and the purge mode are completed, the switching valve is switched and controlled to shift to the next operation cycle, the second operation cycle. FIG. 6(b) shows the state of connection between the heat storage area 10, the air supply channel 50, the exhaust channel 60, and the purge channel 70 in the second operation cycle.

As shown in FIG. 6B, in the air supply mode of the second operation cycle (Step 2), the heat storage chambers 11A, 11F, and 11H constitute the first group while remaining in the first operation cycle. On the other hand, the heat storage chamber 11C, which was in the exhaust mode in the first operation cycle, switches to the air supply mode instead of the heat storage chamber 11D, which is in a low temperature state due to the repeated passage of the gas to be treated. That is, in the second operation cycle, the heat storage chambers 11A, 11C, 11F, and 11H constitute the first group in the air supply mode.

In the exhaust mode, the heat storage chambers 11E, 11G, and 11I constitute the second group while remaining in the first operation cycle. On the other hand, instead of the heat storage chamber 11C switched to the air supply mode, the heat storage chamber 11B is in the exhaust mode and constitutes the second group. Since the heat storage chamber 11B was in the purge mode in the first operation cycle, the gas to be treated remaining in the heat storage body 12B is purged. Therefore, it is possible to prevent the residual gas in the heat storage body 12B from being released to the atmosphere by the exhaust gas passing through the heat storage chamber 11B.

The heat storage chamber 11D, which was in the air supply mode in the first operation cycle, constitutes the third group in the purge mode. That is, a large amount of the gas to be treated remains in the heat accumulator 12D due to repeated passage of the gas to be treated in the previous operation cycle. Therefore, in the second operation cycle, the remaining gas to be treated can be purged by switching the heat storage chamber 11D to the purge mode.

As described above, in the air supply mode of the second operation cycle, the air supply switching valves 51A, 51C, 51F, and 51H corresponding to the heat storage chambers 11A, 11C, 11F, and 11H are "open", and the air supply switching valves 51A, 51C, 51F, and 51H Switching control is performed so that the valves 51B, 51D, 51E, 51G and 51I are "closed", the exhaust switching valves 61A-61I are "closed", and the purge switching valves 71A-71I are "closed".

In the exhaust mode in the second operation cycle, the exhaust switching valves 61B, 61E, 61G, and 61I corresponding to the heat storage chambers 11B, 11E, 11G, and 11I are "open", and the air supply switching valves 51A to 51I are "open". The switching valves 61A, 61C, 61D, 61F and 61H for exhaust are "closed", and the switching valves 71A to 71I for purging are controlled to be "closed".

Furthermore, in the purge mode of the second operation cycle, the purge switching valve 71D corresponding to the heat storage chamber 11D is "open", the air supply switching valves 51A to 51I, the exhaust switching valves 61A to 61I, the purge switching valves 71A to 71C and 71E to 71I are switched and controlled to be "closed".

As the second operation cycle, when the series of cycles of the air supply mode, the exhaust mode, and the purge mode are completed, the switching valve is switched and controlled to shift to the next operation cycle, the third operation cycle. FIG. 6(c) shows the state of connection between the heat storage area 10, the air supply channel 50, the exhaust channel 60, and the purge channel 70 in the third operation cycle.

As shown in FIG. 6(c), in the air supply mode of the third operation cycle (Step 3), the heat storage chambers 11A, 11C, and 11H constitute the first group while remaining in the second operation cycle. On the other hand, the heat storage chamber 11E, which was in the exhaust mode in the third operation cycle, switches to the air supply mode instead of the heat storage chamber 11F, which is in a low temperature state due to the repeated passage of the gas to be treated. That is, in the third operation cycle, the heat storage chambers 11A, 11C, 11E, and 11H constitute the first group in the air supply mode.

Further, in the exhaust mode, the heat storage chambers 11B, 11G, and 11I constitute the second group while remaining in the second operation cycle. On the other hand, instead of the heat storage chamber 11E switched to the air supply mode, the heat storage chamber 11D is in the exhaust mode and constitutes the second group. Since the heat storage chamber 11D was in the purge mode in the second operation cycle, the gas to be treated remaining in the heat storage medium 12D is purged. Therefore, it is possible to prevent the residual gas in the heat storage element 12D from being released to the atmosphere by the exhaust gas passing through the heat storage chamber 11D.

The heat storage chamber 11F, which was in the air supply mode in the second operation cycle, constitutes the third group in the purge mode. That is, a large amount of the gas to be treated remains in the heat accumulator 12F due to repeated passage of the gas to be treated in the previous operation cycle. Therefore, in the third operation cycle, the remaining gas to be treated can be purged by switching the heat storage chamber 11F to the purge mode.

As described above, in the air supply mode of the third operation cycle, the air supply switching valves 51A, 51C, 51E, and 51H corresponding to the heat storage chambers 11A, 11C, 11E, and 11H are "open" and the air supply switching Switching is controlled so that the valves 51B, 51D, 51F, 51G, and 51I are "closed", the exhaust switching valves 61A-61I are "closed", and the purge switching valves 71A-71I are "closed".

Further, in the exhaust mode in the third operation cycle, the exhaust switching valves 61B, 61D, 61G, and 61I corresponding to the heat storage chambers 11B, 11D, 11G, and 11I are "open", and the air supply switching valves 51A to 51I are open. The switching valves 61A, 61C, 61E, 61F and 61H for exhaust are "closed", and the switching valves 71A to 71I for purge are controlled to be "closed".

Furthermore, in the purge mode in the third operation cycle, the purge switching valve 71F corresponding to the heat storage chamber 11F is "open", the air supply switching valves 51A to 51I, the exhaust switching valves 61A to 61I, the purge switching valves 71A to 71E and 71G to 71I are controlled to be "closed".

Since the operation is continued while the heat storage chambers constituting the air supply mode, the exhaust mode, and the purge mode are sequentially replaced one by one in the fourth and subsequent operation modes, the amount of air supply and exhaust is kept uniform and all heat storage is performed. The chambers can be purged sequentially at predetermined times.

[Table 2]

In Embodiments 1 and 2, the heat storage area 10 is composed of the heat storage chambers 11A to 11I. Mode operation is possible. In particular, by increasing the number of heat storage chambers to 5 or more and forming an odd number of the heat storage chambers, one of the heat storage chambers is set to the purge mode, and the remaining heat storage chambers are set to the air supply mode and the exhaust mode. By equally allocating, the minimum amount of purging can be performed while ensuring a sufficient amount of air supply and exhaust, so that the entire apparatus can be made compact and thermal decomposition can be promoted.

As described above, the thermal storage combustion deodorizing device and the method of operating the thermal storage combustion deodorizing device according to the present invention are excellent in workability due to their compact structure, and can improve the decomposition efficiency of organic substances in the gas to be treated. .

1 heat storage combustion deodorizing device 10 heat storage area 11 heat storage chamber 12 heat storage element 13 partition plate 20 air supply fan 30 purge blower 40 combustion chamber 41 burner 42 fuel on/off valve 43 fuel supply path 50 air supply flow path 51 air supply switching valve 60 exhaust flow path 61 exhaust switching valve 70 purge passage 71 purge switching valve

Claims (6)

a combustion chamber for thermally decomposing the gas to be treated;
A plurality of heat accumulators communicating with the combustion chamber and having heat accumulators therein, divided into n chambers (n is an integer of 5 or more) in series by partition plates in one tower and extending in the horizontal direction A heat storage combustion deodorizing device comprising a heat storage area consisting of a chamber,
A purge flow path connected to each heat storage chamber of the heat storage area and tapered downward in a space continuously formed below the heat storage area for purging the gas to be treated remaining in the heat storage area. In a plan view, an air supply passage connected to the heat storage area and supplying the gas to be processed to the combustion chamber is provided on one side across the purge passage, and the heat storage area is provided on the other side across the purge passage. an exhaust flow path connected to the heat storage chamber and exhausting the exhaust gas thermally decomposed in the combustion chamber is formed;
In one operation step, a first group composed of a plurality of heat storage chambers in which the air supply flow path is in communication, and a heat storage chamber different from the first group and in which the exhaust flow path is in communication. A second group composed of the same number of heat storage chambers as the one group, and heat storage chambers different from the first group and the second group, the number of which is smaller than that of the first group in which the purge passages are in communication. A regenerative combustion deodorizing device provided with a switching mechanism for performing switching control to a third group composed of regenerative chambers. The first group and the second group are composed of (n−1)/2 (n is an odd number of 5 or more) heat storage chambers,
2. The regenerative combustion deodorizing device according to claim 1, wherein the third group comprises one regenerative chamber. Switching control by the switching mechanism in the one operation step includes:
3. The regenerative combustion deodorizing device according to claim 1, wherein in the operating step immediately before the one operating step, a predetermined heat storage chamber to which the air supply channel communicates is selected and communicated with the purge channel. . Switching control by the switching mechanism in the one operation step includes:
A predetermined heat storage chamber communicated with the purge passage in the operation step immediately before the one operation step is selected to be one of the heat storage chambers communicating with the exhaust passage. 4. The regenerative combustion deodorizing device according to any one of 3. Switching control by the switching mechanism in the one operation step includes:
A predetermined heat storage chamber communicated with the exhaust flow path in the operation step immediately before the one operation step is selected to be one of the heat storage chambers communicating with the air supply flow path. 5. The regenerative combustion deodorizing device according to any one of 4. The air supply passage has an air supply fan for supplying the gas to be processed,
The regenerative combustion deodorizing device according to any one of claims 1 to 5, wherein the purge flow path extracts exhaust gas from the combustion chamber and causes it to circulate upstream of the air supply fan.

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