JP5935726B2 - Deodorizing device - Google Patents

Description

  The present invention belongs to a technical field related to a deodorization treatment apparatus that performs a deodorization treatment of a gas to be treated containing an organic substance.

  For example, organic substances such as toluene and xylene are exhausted in the painting of the body of an automobile and the drying process thereof. Since such exhaust gas adversely affects the environment, it is deodorized by a deodorizing apparatus. As such a deodorizing apparatus, a catalytic combustion type deodorizing apparatus that burns (oxidizes) an odorous component in the gas to be treated by a catalyst (for example, Pt, Pd), or as disclosed in Patent Document 1, for example, The odor component in the gas to be processed is burned at a high temperature of 700 ° C. to 800 ° C., the heat of the heated gas to be processed is stored in the heat storage material, and the stored heat is used as the residual heat of the gas to be processed before processing. There is a heat storage type deodorization treatment device that is used.

  The catalyst of the catalytic combustion type deodorizing apparatus is supported on a filter-like member, and deodorizing treatment is performed by oxidizing combustion when the gas to be processed passes through the member. In this catalytic combustion type deodorizing apparatus, a pretreatment agent for supplementing the catalyst poison is usually provided on the upstream side of the catalyst so that the performance of the catalyst does not deteriorate due to the catalyst poison. This pretreatment agent is also carried on the filter member. Moreover, the heat storage material of the said heat storage type deodorization processing apparatus is comprised by the honeycomb form, and transfer of heat is performed between a to-be-processed gas and a heat storage material, when a to-be-processed gas passes there. As described above, the deodorizing apparatus (catalytic combustion type deodorizing apparatus or heat storage type deodorizing apparatus) is provided with a gas passage member through which the gas to be processed passes.

  In the deodorizing apparatus, carbon such as organic matter in the gas to be treated becomes combustion residue, which adheres to the gas passage member. When the deodorizing process proceeds due to such combustion debris, the gas passage member is clogged, thereby reducing the amount of air passing through the gas to be treated, and the catalyst (usually heating the gas to be treated as a heat source). It may not be possible to heat to an appropriate temperature, or sufficient residual heat may not be applied to the gas to be processed before processing. When the gas passage member is clogged in this way, the deodorization rate is lowered.

  Therefore, as shown in Patent Document 1, in order to recover the deodorization rate, the gas passage member is periodically heated to a temperature higher than the temperature during the deodorization process of the gas to be processed. The combustion residue adhering to the gas passage member is burned or oxidized and decomposed. Such a heat treatment is also called an empty baking process. After this heat treatment (empty baking treatment), deodorization treatment is performed again.

JP 2008-45818 A

  By the way, when performing the said deodorizing process and the said heat processing (empty baking process) repeatedly, the recovery | restoration amount (increase amount) of the deodorizing rate by heat processing falls as time-dependent heat processing. This is because there are combustion residues that are not burned or oxidatively decomposed even when burned, and such combustion residues accumulate. Further, in the catalytic combustion type deodorizing apparatus, the catalyst being covered with the catalyst poison also causes a reduction in the recovery amount of the deodorizing rate.

  Therefore, it is conceivable to increase the heating time of the gas passage member as much as possible so that the accumulated combustion residue is burnt or oxidatively decomposed.

  However, if the gas passage member is heated for a long time (that is, the gas to be processed is heated for a long time), the deodorizing apparatus may be exposed to a high temperature and thermally deteriorated. In particular, in a catalytic combustion type deodorizing apparatus, when the temperature of the catalyst exceeds a temperature of, for example, about 550 ° C., the catalyst is thermally deteriorated. Further, even if the gas passage member is heated for a long time, there is combustion residue that is not burned or oxidatively decomposed, and accumulation of combustion residue is inevitable. For this reason, energy may be wasted in the heat treatment.

  The present invention has been made in view of such points, and the object of the present invention is to efficiently perform each heat treatment when the deodorization treatment and the heat treatment (empty baking treatment) are repeated. Thus, it is intended to save energy and to suppress thermal deterioration of the deodorizing apparatus accompanying the heat treatment.

In order to achieve the above object, in the present invention, there is provided a gas passage member through which a gas to be treated containing an organic substance passes, and a deodorizing treatment means for performing a deodorizing treatment of the gas to be treated. For the deodorization treatment device provided with a deodorization rate recovery means for recovering the deodorization rate of the deodorization treatment by applying a heat treatment for heating the gas passage member to a temperature higher than the temperature at the time of the deodorization treatment, The deodorization rate recovery means is configured to set the heat treatment time shorter in the heat treatment later in time than the previous heat treatment , and further, the deodorization rate recovery means is configured to The heat treatment time in the current heat treatment is set based on at least one of the amount of increase in the deodorization rate due to the heat treatment and the reduced state of the deodorization rate after the previous heat treatment. Is configured, it has a configuration that.

  With the above configuration, the heat treatment time is set shorter in the subsequent heat treatment over time than in the previous heat treatment, so that optimum heat energy is given to the gas passage member in each heat treatment. Can do. That is, in each heat treatment, even if the heat treatment time is lengthened, the combustion adhering to the gas passage member after a certain time has elapsed from the start of the heat treatment (the heat treatment becomes shorter with time). The waste is hardly burned or oxidatively decomposed, and energy is wasted. In addition, there is a possibility that the thermal degradation of the deodorizing apparatus will be caused. In particular, in the catalytic combustion type deodorizing apparatus, the possibility that the catalyst is thermally degraded becomes high. However, in the present invention, the heat treatment time in each heat treatment can be set to a time during which combustion residue combustion or oxidative decomposition can be efficiently performed, and wasteful consumption of energy can be prevented. Moreover, the thermal degradation of the deodorizing apparatus (especially the catalyst of a catalytic combustion type deodorizing apparatus) accompanying heat processing can be suppressed.

The amount of increase in the deodorization rate due to the previous heat treatment on the gas passage member, and the state of decrease in the deodorization rate after the previous heat treatment (the rate of decrease in the deodorization rate with respect to time, or the deodorization rate is In this case, it is preferable to set the heat treatment time in the current heat treatment based on at least one of the time until the reference amount is reduced by a predetermined reference amount). The heat treatment time can be set more appropriately.

  According to an embodiment of the present invention, the deodorizing means is configured to heat the gas to be treated to a predetermined temperature during the deodorizing process, and the deodorizing rate recovery means is configured to cause the gas to be treated to be the predetermined temperature. By heating to a temperature higher than the temperature and passing through the gas passage member, the heat treatment is performed on the gas passage member.

As a result, the gas passage member is heated through the gas to be processed, and the heat treatment for the gas passage member can be easily performed without providing a heating means for directly heating the gas passage member .

According to another embodiment of the present invention, the deodorization rate recovery means is configured to perform the heat treatment when the deodorization rate is reduced to a predetermined value.

  As a result, it is possible to prevent the deodorization rate from falling below a predetermined value, and as a result, the odor concentration of the gas to be treated discharged to the atmosphere can be always maintained at a low level.

  According to still another embodiment of the present invention, the deodorization rate recovery means is configured to perform the heat treatment at a predetermined time interval and set the predetermined time interval to be shorter as time passes. ing.

  That is, since the recovery amount of the deodorization rate decreases with time, the time until the deodorization rate becomes a value such as the predetermined value from the value immediately after the start of the deodorization treatment after the heat treatment is shortened. In consideration of this, by setting the predetermined time interval short, the heat treatment can be performed before the deodorization rate is largely reduced. As a result, the odor concentration of the gas to be processed discharged to the atmosphere can be maintained at a low level.

As described above, according to the deodorizing apparatus of the present invention, in the subsequent heat treatment, the heat treatment time is set shorter than the previous heat treatment, and the previous heat treatment on the gas passage member is performed. By setting the heat treatment time in the current heat treatment based on at least one of the increase in the deodorization rate and the reduced state of the deodorization rate after the previous heat treatment , each heat treatment is performed. It can be performed efficiently and energy consumption can be prevented from being wasted, and thermal deterioration of a deodorizing apparatus (particularly a catalyst of a catalytic combustion type deodorizing apparatus) associated with heat treatment can be suppressed. Moreover, the heat treatment time in the current heat treatment to be performed can be set appropriately.

It is a top view which shows schematic structure of the whole deodorizing processing system using the deodorizing processing apparatus (catalyst combustion type deodorizing processing apparatus) which concerns on embodiment of this invention. It is sectional drawing which shows the inside of a deodorizing processing apparatus. It is a block diagram which shows the structure of the control system of a deodorizing processing apparatus. It is a graph which shows the relationship between the deodorizing rate immediately after the deodorizing process start after the last baking process, and the heat processing time in this baking process. It is a graph which shows an example of the change with respect to time of the deodorizing rate d. It is a graph which shows another example of the change with respect to time of the deodorizing rate d. It is a flowchart which shows the processing operation by a controller. It is the schematic which shows the structure of the thermal storage type deodorizing processing apparatus which is another example of a deodorizing processing apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a schematic configuration of an entire deodorization processing system using a deodorization processing apparatus 1 according to an embodiment of the present invention. This deodorization processing system performs the deodorization processing of the to-be-processed gas containing organic substance which generate | occur | produces in a coating drying furnace. The organic matter (odor component) of the gas to be treated is toluene, xylene, benzene, methyl ethyl ketone, ethyl acetate or the like. In the present embodiment, the deodorization treatment apparatus 1 is a catalytic combustion type deodorization treatment apparatus that burns (oxidizes) an organic substance (odor component) in a gas to be treated with a catalyst (for example, Pt, Pd).

  The gas to be treated from the coating and drying furnace enters the deodorizing treatment apparatus 1 from the inlet portion 2 through the inlet pipe 5 connected to the inlet portion 2 of the deodorizing treatment apparatus 1. And the deodorizing process is made in the deodorizing apparatus 1 as described later, and the gas to be treated after the deodorizing process is passed from the outlet part 3 (see FIG. 2) to the outlet pipe 6 connected to the outlet part 3. The gas is discharged (see the arrow indicating the flow of the gas to be processed in FIG. 2).

  The outlet pipe 6 is provided with an upstream heat exchanger 7 and a downstream heat exchanger 8. The upstream heat exchanger 7 preheats the gas to be processed before the treatment flowing through the introduction pipe 5 with the gas to be treated after the deodorization treatment (having a temperature of about 500 ° C. due to reaction heat). Further, the downstream heat exchanger 8 has an air supply pipe 9 for supplying hot air to the coating drying furnace by the gas to be treated (having a temperature of about 300 ° C.) after passing through the upstream heat exchanger 7. It is for heating the air which flows. The gas to be processed after passing through the downstream heat exchanger 8 is discharged to the atmosphere.

  The gas to be treated from the coating drying furnace is preheated by the gas to be treated after the deodorizing treatment in the upstream heat exchanger 7 and then enters the inlet side chamber 11 in the deodorizing treatment apparatus 1 through the inlet portion 2. . As shown in FIG. 2, a burner 21 is provided on the side wall portion of the inlet side chamber 11 of the deodorizing treatment apparatus 1, and the gas to be treated is heated to a predetermined temperature (300 to activate the catalyst by the burner 21. To 400 ° C.).

  The deodorizing apparatus 1 is provided with filter-like upstream and downstream gas passage members 23 and 24 through which the gas to be treated heated by the burner 21 passes. These upstream and downstream gas passage members 23, 24 are arranged in the direction of gas flow in each of a plurality of attachment members 22 fixed to a partition wall 13 that partitions the inside of the deodorizing apparatus 1 into an inlet side chamber 11 and an outlet side chamber 12. It is attached to line up. The heated gas to be processed passes through the upstream side and downstream side gas passage members 23 and 24 in order to reach the outlet side chamber 12 from the inlet side chamber 11, and the outlet portion provided on the side wall portion of the outlet side chamber 12. 3 is discharged to the outlet pipe 6.

The catalyst is supported on the downstream gas passage member 24. By this catalyst, the odor component in the gas to be treated is oxidized and burned to perform deodorization treatment. This catalyst has a temperature at which the catalyst is activated by the gas to be treated heated by the burner 21. The upstream gas passage member 23 carries a pretreatment agent that supplements a catalyst poison (especially an organic silicone compound or an organic phosphorus compound) that lowers the performance of the catalyst. If even a small amount of organosilicone compound or organophosphorus compound is contained in the gas to be treated, it is oxidized by the above catalyst to generate nonvolatile SiO ₂ or P ₂ O ₅ , which covers the surface of the catalyst. Therefore, the upstream gas passage member 23 for removing the catalyst poison is provided on the upstream side of the downstream gas passage member 24. In the present embodiment, the burner 21, the upstream and downstream gas passage members 23 and 24, and the deodorization processing execution unit 51a of the controller 51 described later constitute deodorization processing means for performing the deodorization processing of the gas to be processed.

  As shown in FIG. 3, the deodorizing apparatus 1 is provided with a controller 51 that controls the output of the burner 21 during the deodorizing process of the gas to be processed and performs an after-mentioned baking process. The controller 51 is based on a well-known microcomputer, and includes a central processing unit (CPU) that executes a program, a memory that includes, for example, a RAM or ROM, and stores a program and data, and an electrical signal. And an input / output (I / O) unit for inputting / outputting.

  In the controller 51, a deodorizing process execution unit 51a that performs the deodorizing process of the gas to be processed, and an empty for determining whether or not the baking process should be performed on the upstream side and downstream side gas passage members 23 and 24 are performed. Burn determination unit 51b, an empty firing condition setting unit 51c for setting an empty firing condition when it is determined by this empty firing determination unit 51b that an empty firing process should be executed, and an empty firing process execution for executing an empty firing process 51d, an inspection / maintenance alarm determination unit 51e for determining whether or not an alarm indicating that inspection and maintenance of the upstream and downstream gas passage members 23, 24 are necessary, and an inspection / maintenance alarm determination unit When it is determined by 51e that the alarm should be output, the alarm device 52 is provided with an alarm output unit 51f that outputs the alarm.

  The controller 51 receives detection information from the temperature sensor 55, the inlet side HC concentration sensor 56, and the outlet side HC concentration sensor 57. The temperature sensor 55 is disposed in the inlet side chamber 11 and detects the temperature of the gas to be processed after being heated by the burner 21 and before entering the upstream side gas passage member 23.

  The deodorizing process execution unit 51a controls the output of the burner 21 (PID control in this embodiment) so that the temperature detected by the temperature sensor 55 becomes the predetermined temperature during the deodorizing process of the gas to be processed.

  The air baking process is a process of recovering the deodorization rate of the deodorizing process by performing a heating process for heating the upstream and downstream gas passage members 23, 24 to a temperature higher than the temperature during the deodorizing process. That is. That is, in the deodorizing apparatus 1, carbon such as organic matter in the gas to be treated becomes combustion residue, which adheres to the upstream and downstream gas passage members 23 and 24. As the deodorization process proceeds, such combustion debris causes clogging and the like in the upstream and downstream gas passage members 23, 24, thereby reducing the amount of air passing through the gas to be treated and keeping the catalyst at an appropriate temperature. Can no longer be heated and the deodorization rate is reduced. Therefore, the empty baking process execution unit 51d of the controller 51 executes the empty baking process. In the present embodiment, in the empty baking process, the gas to be processed is heated to a temperature higher than the predetermined temperature and passed through the upstream and downstream gas passage members 23 and 24, whereby the upstream and downstream gas passages are passed. The heat treatment is performed on the members 23 and 24.

The deodorization rate d is expressed by the following formula (1)
d = (1−outlet side odor concentration / inlet side odor concentration) × 100 (%) (1)
It is represented by Here, the odor concentration is a dilution factor in which an odorous gas is diluted with odorless air so that no odor can be felt by human odor.

Since the inlet-side odor concentration and the outlet-side odor concentration are correlated with the inlet-side HC concentration and the outlet-side HC concentration, respectively, the deodorization rate d is correlated with the value of (1-outlet-side HC concentration / inlet-side HC concentration). There is a relationship. If this correlation is obtained in advance as a function f, the following equation (2)
d = f (1−outlet side HC concentration / inlet side HC concentration) (2)
Thus, the deodorization rate d can be obtained. That is, the deodorization rate d can be obtained from the inlet HC concentration and the outlet HC concentration.

  Therefore, in this embodiment, in order to detect the deodorization rate d, the inlet-side HC concentration and the outlet-side HC concentration are detected by the inlet-side HC concentration sensor 56 and the outlet-side HC concentration sensor 57, respectively. The inlet-side HC concentration sensor 56 is disposed in the inlet-side chamber 11 and detects the HC concentration of the gas to be processed before entering the upstream gas passage member 23. The outlet side HC concentration sensor 57 is disposed in the outlet side chamber 12 and detects the HC concentration of the gas to be processed that has passed through the downstream side gas passage member 24.

The deodorization rate d has a correlation with the value of (exit side gas pressure / inlet side gas pressure) or the value of (initial inlet / outlet differential pressure / current inlet / outlet differential pressure). If it is obtained as a function g or h, the following formula (3) or formula (4)
d = g (outlet side gas pressure / inlet side gas pressure) (3)
d = h (initial inlet / outlet differential pressure / current inlet / outlet differential pressure) (4)
Thus, the deodorization rate d can be obtained.

  In this case, an inlet side gas pressure sensor for detecting the inlet side gas pressure (pressure of the gas to be processed on the inlet side) is disposed in the inlet side chamber 11, and the outlet side gas pressure (the outlet side gas to be processed) is disposed in the outlet side chamber 12. An outlet side gas pressure sensor for detecting the gas pressure) is provided, and the inlet side gas pressure sensor and the outlet side gas pressure sensor detect the inlet side gas pressure and the outlet side gas pressure, respectively. By detecting the difference (inlet / outlet differential pressure), the deodorization rate d can be obtained.

  The empty baking determination unit 51b calculates the deodorization rate d from the equation (2), and determines that the empty baking process should be executed when the calculated deodorization rate d is reduced to a predetermined value d0. The predetermined value d0 is a value that adversely affects the environment when the deodorization rate d is lower than the predetermined value d0, and is stored in the memory in advance.

  The empty baking condition setting unit 51c sets the empty baking condition when the empty baking determination unit 51b determines that the empty baking process should be executed. That is, the heating temperature of the gas to be processed (that is, the heat treatment temperature for the upstream and downstream gas passage members 23 and 24) and the time for the baking process (the heat treatment time for the upstream and downstream gas passage members 23 and 24) And set.

  The heat treatment time is set shorter in the later baking process (heating process) over time than the previous baking process (heating process). The heating temperature of the gas to be treated is higher than the predetermined temperature (300 ° C. to 400 ° C.) and lower than the heat degradation start temperature (usually about 550 ° C.) of the catalyst (for example, 450 ° C. to 500 ° C.). ° C). Unlike the heat treatment time, this heating temperature is constant regardless of the time course.

  In the present embodiment, the empty baking condition setting unit 51c is based on the amount of increase in the deodorization rate (recovery amount) due to the previous empty baking process (heating process), and the heating process time in the current heating process to be executed from now on. Set. Since the deodorization rate immediately before the start of the previous heat treatment is basically the predetermined value d0, the larger the increase amount (recovery amount), the more the deodorization rate immediately after the start of the deodorization treatment after the previous baking process. growing. Therefore, the amount of increase can be substituted by the deodorization rate immediately after the start of the deodorizing process after the previous baking process. As shown in FIG. 4, the heat treatment time in the current baking process becomes shorter as the deodorization rate immediately after the start of the deodorizing process after the previous baking process is smaller. The heat treatment time during the first baking process is t0. The heat treatment time in FIG. 4 is set so that the deodorization rate immediately after the start of the deodorization process after the previous baking process is between d0 and the vicinity thereof to 100%. And the amount of recovery | restoration becomes so small that it is the later baking process with time (refer FIG. 5). Therefore, the empty baking condition setting unit 51c sets the heat treatment time shorter in the subsequent heat treatment (empty baking process) over time than in the previous heat treatment.

  The amount of recovery decreases with time of the subsequent baking process, because there is combustion residue that is not combusted or oxidatively decomposed even when the baking process is performed. This is because the catalyst is covered with the catalyst poison as it accumulates at 23 and 24. And in each baking process, even if the heat treatment time is lengthened, after a certain time has elapsed from the start of the heat treatment (the shorter the heat treatment with time), the upstream and downstream gasses Combustion or oxidative decomposition of the combustion residue adhering to the passage members 23 and 24 hardly occurs, and energy is wasted. Further, in the deodorizing apparatus 1, there is a high possibility of causing thermal deterioration of a portion (particularly a catalyst) in contact with a high temperature gas to be processed. Therefore, the heat treatment time in each empty baking process is set as described above in order to set the time during which combustion residue combustion or oxidative decomposition can be performed efficiently.

  In addition, instead of or in addition to the amount of increase, the amount of increase in the deodorization rate due to the previous heat treatment (deodorization rate immediately after the start of the deodorization treatment after the previous empty baking treatment) You may make it set the heat processing time in this heat processing based on the fall state of the said deodorizing rate. The reduced state is a decrease rate with respect to time of the deodorization rate or a time until the deodorization rate is decreased by a predetermined reference amount. That is, since the degree of decrease in the deodorization rate increases with time of the subsequent baking process, the heat treatment time can be appropriately set according to the above-described decrease state.

  The empty baking process execution unit 51d executes the empty baking process according to the empty baking conditions set by the empty baking condition setting unit 51c. That is, when the deodorization rate d is reduced to the predetermined value d0, the empty baking process execution unit 51d executes the empty baking process according to the empty baking condition. At this time, the baking process execution unit 51d controls the output of the burner 21 so that the temperature detected by the temperature sensor 55 becomes the heating temperature set by the baking condition setting unit 51c (in this embodiment, PID control). )

  The air baking process execution unit 51d ends the air baking process after executing the air baking process for the set heat treatment time. Thereby, the deodorizing process execution part 51a performs a deodorizing process again, ie, controls the output of the burner 21 so that the temperature detected by the temperature sensor 55 becomes the predetermined temperature.

  In the present embodiment, the empty baking determination unit 51b, the empty baking condition setting unit 51c, the empty baking process execution unit 51d, and the burner 21 of the controller 51 constitute deodorization rate recovery means for recovering the deodorization rate of the deodorization process.

  FIG. 5 shows an example of a change in the deodorization rate d as the deodorization process proceeds. Thus, whenever the deodorization rate d falls to the predetermined value d0 (every predetermined timing), the baking process is executed and the deodorization rate d recovers (increases). However, the recovery amount (that is, the deodorization rate immediately after the start of the deodorizing process after the baking process) becomes smaller as the baking process is performed later. In this embodiment, the heat treatment time is set shorter in the later heat treatment (empty baking treatment) than in the previous heat treatment. Thereby, the heat treatment time in each empty baking process can be set to a time during which combustion residue combustion or oxidative decomposition can be performed efficiently, and wasteful consumption of energy can be prevented. Moreover, the thermal degradation of the deodorization processing apparatus 1 (especially catalyst) accompanying an empty baking process can be suppressed.

  Further, as can be seen from FIG. 5, since the recovery amount is smaller and the deodorization rate d quickly reaches the predetermined value d0 as the time passes, the periods T1, T2,. Basically shorter. That is, T1> T2>.

  When the deodorization rate d immediately after the start of the deodorizing process after the empty baking process is equal to or less than the preset value d1 stored in the memory, the inspection / maintenance alarm determination unit 51e (3 in the example of FIG. 5). The deodorization rate immediately after the start of the deodorizing process after the first baking process is equal to or less than the set value d1), and an alarm indicating that the inspection and maintenance of the upstream and downstream gas passage members 23, 24 are necessary. judge. The set value d1 is larger than the predetermined value d0 and close to the predetermined value d0.

  The alarm output unit 51f requires the alarm device 52 to inspect and maintain the upstream and downstream gas passage members 23 and 24 when the inspection / maintenance alarm determination unit 51e determines that the alarm should be output. An alarm to the effect is output. When the alarm is output by the alarm device 52, the operator needs to stop the operation of the deodorizing apparatus 1 and inspect and maintain the upstream and downstream gas passage members 23 and 24 at an early stage. That is, since the amount of combustion residue and catalyst poison attached to the upstream and downstream gas passage members 23 and 24 has increased too much, the deodorization rate d is hardly recovered even if the baking process is performed, and the state is left as it is. If this is done, the odor concentration of the gas to be treated discharged to the atmosphere will increase, so the upstream and downstream gas passage members 23, 24 are washed with chemicals to remove combustion debris, catalyst poisons, etc. As a result, the upstream and downstream gas passage members 23 and 24 are regenerated. Alternatively, the upstream side and downstream side gas passage members 23 and 24 may be replaced with new ones. If the upstream and downstream gas passage members 23, 24 are regenerated or replaced with new ones as described above, as shown by the two-dot chain line in FIG. 5, the same high deodorization rate as that immediately after the start of the deodorization treatment is obtained. The same operation as the operation from the start of the process to the reproduction or exchange is repeated.

  FIG. 6 shows another example of a change in the deodorization rate d as the deodorization process proceeds. In FIG. 6, the deodorization rate d on the vertical axis decreases as it goes upward, contrary to FIG. 5. FIG. 6 also shows the cause of the decrease in the deodorization rate d. Until the time ta at which the upstream and downstream gas passage members 23 and 24 are regenerated, the influence of deterioration over time (the catalyst is covered by the catalyst poison, etc.) ) Will gradually increase. Further, immediately after the start of the deodorizing process after the baking process, immediately before the start of the next baking process, the influence of clogging and the influence of spear adhesion gradually increase, and these effects are eliminated by the baking process. It should be noted that the effects of deterioration over time, clogging, and influence due to spear adhesion cannot be clearly distinguished.

  As in the example of FIG. 5, the periods T001, T002,. The above-described periods T101, T102,... After the regeneration of the upstream side and downstream side gas passage members 23, 24 are basically shorter as the time passes. Further, since it is difficult to reproduce completely, the periods T101, T102,... After reproduction are shorter than the corresponding periods T001, T002,... (T101 <T001, T102 <T002).

  Here, the processing operation by the controller 51 will be described based on the flowchart of FIG.

  In the first step S1, it is determined whether or not the operation of the deodorizing apparatus 1 has been started by the operator's operation. When the determination at step S1 is NO, the operation at step S1 is repeated. When the determination at step S1 is YES, the process proceeds to step S2.

  In step S2, the deodorizing process execution unit 51a executes the deodorizing process. That is, the deodorizing process execution unit 51a controls the output of the burner 21 so that the temperature detected by the temperature sensor 55 becomes the predetermined temperature.

  In the next step S3, the empty-burn determination unit 51b inputs the inlet side and outlet side HC concentrations from the inlet side and outlet side HC concentration sensors 56 and 57, respectively, and calculates the deodorization rate d from equation (2).

  In the next step S4, the empty-burn determination unit 51b reads the predetermined value d0 from the memory, and in the next step S5, whether or not the empty-burn determination unit 51b satisfies d ≦ d0 (that is, the empty-burn process is performed). Whether or not to execute). When the determination at step S5 is YES, the process proceeds to step S6, while when the determination at step S5 is NO, the process proceeds to step S15.

  In step S6, the baking condition setting unit 51c sets the baking conditions (the heating temperature and the heat treatment time). At this time, the heat treatment time is set based on the deodorization rate da immediately after the start of the deodorization process after the previous baking process, which is stored in step S11 described later.

  In the next step S7, the empty baking process execution unit 51d executes the empty baking process in accordance with the empty baking conditions set in step S6. In the next step S8, the empty baking process execution unit 51d performs the operation in step S6. After the set heat treatment time has elapsed, the baking process is terminated.

  In the next step S9, the deodorizing process execution unit 51a executes the deodorizing process, that is, controls the output of the burner 21 so that the temperature detected by the temperature sensor 55 becomes the predetermined temperature.

  In the next step S10, the deodorization rate da immediately after the start of the deodorization process after the empty baking process is calculated, and in the next step S11, the deodorization rate da calculated in step S10 is updated and stored in the memory.

  In the next step S12, the inspection / maintenance alarm determination unit 51e reads the set value d1 from the memory, and in the next step S13, the inspection / maintenance alarm determination unit 51e determines whether da ≦ d1. . When the determination in step S13 is YES, the process proceeds to step S14. When the determination in step S13 is NO, the process proceeds to step S15.

  In step S14, the alarm output unit 51f causes the alarm device 52 to output an alarm indicating that inspection and maintenance of the upstream and downstream gas passage members 23, 24 are necessary, and then proceeds to step S15.

  In step S15, it is determined whether or not to stop the operation of the deodorizing apparatus 1 by the operator's operation. When the determination in step S15 is NO, the process returns to step S2. On the other hand, when the determination in step S15 is YES, the processing operation is terminated.

  Therefore, in the present embodiment, the heat treatment time is set shorter in the subsequent baking process (heating process) over time than the previous baking process (heating process). It is possible to efficiently perform energy consumption and prevent wasteful consumption of energy, and it is possible to suppress thermal deterioration of the deodorizing apparatus 1 (particularly a catalyst) associated with the empty baking process.

  In addition, when the deodorization rate d of the deodorization process is reduced to the predetermined value d0, the upstream side and the downstream side gas passage members 23 and 24 are subjected to the empty baking process (heating process). As a result, it is possible to keep the odor concentration of the gas to be processed discharged to the atmosphere at a low level.

  In the above embodiment, when the deodorization rate d decreases to the predetermined value d0, the baking process (heating process) is performed. However, the baking process (heating process) is performed at predetermined time intervals. May be. The predetermined time interval, which is the time interval for the baking process, is shortened as the time passes. For example, as shown in FIG. 5, the time during which the deodorization rate d decreases to the predetermined value d0 immediately after the start of the deodorization process after the empty baking process is checked in advance, and at the time intervals (T1, T2,... An empty baking process may be performed. Alternatively, until the first regeneration or replacement, as in the above-described embodiment, when the deodorization rate d is reduced to the predetermined value d0, an empty baking process is executed, and from the empty baking process at that time to the next empty baking process Are stored in a memory, and after playback or replacement, the predetermined time interval is set based on the time interval stored in the memory (after playback, the above-mentioned stored before playback is stored). It may be set shorter than the time interval), and the empty baking process may be executed at the set predetermined time interval.

  Alternatively, instead of performing the baking process when the deodorization rate d decreases to the predetermined value d0, when the decrease rate with respect to time of the deodorization rate becomes larger than a predetermined reference value, or the deodorization rate However, it may be executed when the time until it decreases by a predetermined reference amount becomes shorter than the predetermined reference time.

  Moreover, in the said embodiment, although the deodorizing processing apparatus 1 was made into the catalytic combustion type deodorizing processing apparatus, this invention is applicable also to the thermal storage type deodorizing processing apparatus 71 as shown, for example in FIG. The heat storage type deodorization processing device 71 includes a first heat storage tank 72 in which a first heat storage material 76 is disposed and a second heat storage tank 73 in which a second heat storage material 77 is disposed. One ends of the first and second heat storage tanks 72 and 73 in the longitudinal direction are connected to each other by a connecting passage 74 provided with a burner 81 whose output is controlled by a controller similar to the controller 51 of the above embodiment. Two switching valves 82 are provided in each of the other end portions of the first and second heat storage tanks 72 and 73. The controller controls the opening and closing of the switching valve 82 so that the flow state of the gas to be processed is alternately switched between the first state and the second state at a preset time interval (for example, 90 s). It has become. The first and second heat storage materials 76 and 77 are formed in a honeycomb shape. When the gas to be processed passes therethrough, heat is transferred between the gas to be processed and the first or second heat storage materials 76 and 77. Is done. The first and second heat storage materials 76 and 77 can be regarded as filter-like gas passage members.

  In the first state, the gas to be treated that has flowed into the first heat storage tank 72 is preheated by passing through the first heat storage material 76 (stored when it was in the second state of the previous time). The processing gas is heated to a predetermined temperature (in this example, 700 ° C. to 800 ° C.) by the burner 81. As a result, the odor component of the gas to be treated is thermally decomposed and deodorized. The heated gas to be processed passes through the second heat storage material 77 to store heat in the second heat storage material 77, and then the gas to be processed flows out of the second heat storage tank 73 (the gas to be processed in the first state). (See solid arrows for process gas flow). Moreover, in the said 2nd state, the to-be-processed gas which flowed into the 2nd heat storage tank 73 is preheated by passing the 2nd heat storage material 77 stored in the 1st last time, and this to-be-processed gas Is heated to the predetermined temperature by the burner 81 and deodorized, and the heated gas to be processed passes through the first heat storage material 76 to store heat in the first heat storage material 76. It flows out of the heat storage tank 72 (refer to the broken arrow indicating the flow of the gas to be treated in the second state). In this example, the 1st and 2nd thermal storage materials 76 and 77, the burner 81, the switching valve 82, and the said controller comprise the deodorizing process means which performs the deodorizing process of to-be-processed gas.

  Also in the heat storage deodorization processing device 71, the first and second heat storage materials 76 and 77 are clogged by the combustion residue, and as a result, sufficient residual heat cannot be given to the gas to be processed before the processing. The deodorizing rate of the deodorizing process is reduced. And like the said embodiment, when a deodorizing rate falls to a predetermined value, or at predetermined time intervals, with respect to the temperature at the time of a deodorizing process, it heats with respect to the 1st and 2nd thermal storage material 76,77. A heating process (empty baking process) is performed. At this time, under the control of the controller, the flow state of the gas to be processed is set to the first state, and the gas to be processed is heated to a temperature higher than the predetermined temperature (for example, 900 ° C. to 1000 ° C.) by the burner 81. By passing the second heat storage material 77 through the second heat storage material 77, the heat treatment is performed on the second heat storage material 77. Then, the flow state of the gas to be processed is changed to the second state, and the gas to be processed is supplied to the predetermined gas by the burner 81. The first heat storage material 76 is heated by heating to a temperature higher than the temperature (for example, 900 ° C. to 1000 ° C.) and passing through the first heat storage material 76. The conditions of the baking process (heating process) for the first and second heat storage materials 76 and 77 are the same as in the above-described embodiment (the heating process time and the heating temperature values themselves are different). In the process (heat treatment), the heat treatment time is set shorter than the previous baking process (heat process), and the heating temperature of the gas to be treated (that is, the heat treatment temperature for the first and second heat storage materials 76 and 77). Is constant regardless of the future over time. In this example, the burner 81, the switching valve 82, and the controller constitute deodorization rate recovery means for recovering the deodorization rate of the deodorization process.

  Accordingly, in the heat storage deodorization processing device 71 as well as in the catalytic combustion type deodorization processing device 1 of the above embodiment, energy can be prevented from being wasted and heat storage deodorization processing associated with heat treatment. Thermal degradation of the device 71 (a portion where a very high temperature target gas of 900 ° C. to 1000 ° C. is in contact) can be suppressed.

  INDUSTRIAL APPLICABILITY The present invention is useful for a deodorization treatment device (a catalytic combustion type deodorization treatment device or a heat storage type deodorization treatment device) that performs a deodorization treatment of a gas to be treated containing organic matter.

1 Deodorization treatment device (catalytic combustion deodorization treatment device)
21 Burner (deodorization treatment means) (deodorization rate recovery means)
23 Upstream gas passage member (deodorizing means)
24 Downstream gas passage member (deodorizing means)
51 controller 51a deodorization processing execution unit (deodorization processing means)
51b Empty baking judgment part (deodorization rate recovery means)
51c Baking condition setting part (deodorization rate recovery means)
51d Empty baking processing execution part (deodorization rate recovery means)
71 Thermal Storage Deodorization Treatment Device 76 First Thermal Storage Material (Deodorization Treatment Means)
77 Second heat storage material (deodorizing means)
81 Burner (deodorization treatment means) (deodorization rate recovery means)
82 Switching valve (deodorization treatment means) (deodorization rate recovery means)

Claims (5)

A gas passage member through which a gas to be treated containing an organic substance passes, and a deodorization treatment means for performing a deodorization treatment of the gas to be treated; and at a predetermined timing, for the gas passage member, from a temperature at the time of the deodorization treatment. A deodorization treatment apparatus comprising a deodorization rate recovery means for recovering the deodorization rate of the deodorization treatment by performing a heat treatment that is also heated to a high temperature,
The deodorization rate recovery means is configured to set a heat treatment time shorter than the previous heat treatment in the later heat treatment over time ,
Further, the deodorization rate recovery means is based on at least one of the amount of increase in the deodorization rate due to the previous heat treatment on the gas passage member and the state of decrease in the deodorization rate after the previous heat treatment. A deodorizing treatment apparatus configured to set a heat treatment time in the treatment. In the deodorization processing apparatus of Claim 1,
The deodorization treatment means is configured to heat the gas to be treated to a predetermined temperature during the deodorization treatment,
The deodorization rate recovery means is configured to perform the heat treatment on the gas passage member by heating the gas to be treated to a temperature higher than the predetermined temperature and passing the gas through the gas passage member. A deodorizing treatment device. In the deodorization processing apparatus of Claim 1 or 2 ,
The reduced state of the deodorization rate is a reduction rate with respect to time of the deodorization rate or a time until the deodorization rate is reduced by a predetermined reference amount. In the deodorization processing apparatus as described in any one of Claims 1-3 ,
The deodorization rate recovery means is configured to perform the heat treatment when the deodorization rate is reduced to a predetermined value. In the deodorization processing apparatus as described in any one of Claims 1-3 ,
The deodorization rate recovery means is configured to perform the heat treatment at a predetermined time interval and to set the predetermined time interval to be shorter as time passes.

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