JP2021188949A - Method and device for determining life of physical adsorption type filter - Google Patents

Abstract

To provide a method for determining the life of a physical adsorption type filter, which is easy in operation, implementable in a short time and highly accurate.SOLUTION: A method for determining the life of a physical adsorption type filter includes a collection efficiency calculation step of calculating the collection efficiency by collecting gas passing through a physical adsorption type filter while supplying reference gas to the physical adsorption type filter, and measuring a concentration of a specific substance in the collected gas, and comparing the concentration with a concentration of the substance in the reference gas. A collection efficiency measurement step is carried out multiple times with respect to an unused physical adsorption type filter, in order to prepare a breakthrough curve which indicates a relationship between the collection efficiency calculated multiple times, and a cumulative supply time of the reference gas to the physical adsorption type filter. After preparing the breakthrough curve, the collection efficiency measurement step is applied to a physical adsorption type filter that is subjected to life determination, and then, the calculated collection efficiency and the breakthrough curve are compared in order to determine the life of the physical adsorption type filter.SELECTED DRAWING: Figure 3

Description

The present invention relates to a life determination method and a life determination device for a physical adsorption type filter.

Conventionally, in order to reduce the cooking odor in the exhaust from kitchens such as restaurants or feeding centers including restaurants, and factories that manufacture or process foods such as bread, processed garlic products, and processed fish meat products, physical adsorption type A filter is used. An example of a physical adsorption type filter is a deodorizing honeycomb filter as described in Patent Document 1. The deodorizing honeycomb filter has a large number of pores extending along the direction of air flow, and physically adsorbs odorous substances in the air (for example, compounds such as acetaldehyde, trimethylamine, acetic acid, amines, and ammonia). Pass the air from which the odorous substances have been removed. Further, the deodorizing honeycomb filter decomposes the adsorbed odorous substance by a catalyst to suppress the diffusion of the odor. When the deodorizing honeycomb filter adsorbs an odorous substance, the deodorizing ability gradually decreases. If the deodorizing honeycomb filter having a reduced deodorizing ability is continuously used, the malodor cannot be removed and diffuses to the downstream side, which may make it impossible to maintain the regulatory standards of the Malodor Prevention Law. Therefore, it is necessary to replace the deodorizing honeycomb filter having a reduced deodorizing ability.

Japanese Unexamined Patent Publication No. 2010-46172

In order to know the appropriate timing for replacing the deodorizing honeycomb filter, the life of the deodorizing honeycomb filter is determined. Generally, when a kitchen or factory, which is an odor source, is operating, sample air is collected on the upstream side (primary side) and the downstream side (secondary side) of the deodorizing honeycomb filter. It is carried to a test laboratory, etc., and the reduction rate of odor concentration (also called deodorization efficiency or collection efficiency) is calculated by the three-point comparison type odor bag method and used as an index. However, the concentration of the original odor of the generated odor is not constant, and varies greatly depending on the environment in which the deodorizing honeycomb filter is installed (for example, weather and temperature), the menu to be cooked (order), and the like. Therefore, it is difficult to accurately evaluate the change in deodorizing ability from the odor measurement result. For example, when the undiluted odor concentration temporarily increases, the odor concentration on the downstream side (secondary side) of the deodorizing honeycomb filter also increases. Furthermore, the deodorizing efficiency itself changes depending on the concentration of the original odor. Therefore, the odor measurement result is merely data that indirectly indicates the deodorizing ability of the deodorizing honeycomb filter, and cannot be said to be an index that directly indicates the deodorizing ability. In addition, the measurement of odor by the three-point comparative odor bag method depends on the human sense of smell and can only be performed by a qualified expert as an odor judge. Therefore, it is often not possible to carry out at a general restaurant, factory or company, and it is necessary to ask a specialized analysis institution, for example, there is a problem that a high cost proportional to the time of about two weeks and the number of measurements is required.

Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a method for determining the life of a physical adsorption type filter and a device for determining the life of the physical adsorption type filter, which are easy to operate, can be carried out in a short time, and have high accuracy.

In the method for determining the life of a physical adsorption type filter of the present invention, a gas that has passed through the physical adsorption type filter is collected while supplying a standard gas to the physical adsorption type filter, and the concentration of a specific substance in the collected gas is measured. Then, the collection efficiency calculation step of calculating the collection efficiency by comparing with the concentration of the substance in the standard gas is included, and the collection efficiency measurement step is performed multiple times for the unused physical adsorption type filter. A breakthrough curve showing the relationship between the collection efficiency calculated multiple times and the cumulative supply time of the standard gas to the physical adsorption type filter is created, and after the breakthrough curve is created, the life is determined. It is characterized in that a collection efficiency measurement step is performed on the physical adsorption type filter, and the life of the physical adsorption type filter is determined by comparing the calculated collection efficiency with the breakthrough curve.

The life determination device of the physical adsorption type filter of the present invention includes a standard gas supply means accommodating a standard gas connected to the upstream side of the physical adsorption type filter and a gas for collecting gas that has passed through the physical adsorption type filter. The control means includes a collection means and a control means for measuring the concentration of a specific substance in the collected gas and calculating the collection efficiency in comparison with the concentration of the substance in the standard gas. While the standard gas is continuously supplied from the standard gas supply means to the unused physical adsorption type filter, the gas collected through the physical adsorption type filter and the specific substance in the collected gas are collected. The measurement of the concentration and the calculation of the collection efficiency are performed multiple times intermittently, and the relationship between the collection efficiency calculated multiple times and the cumulative supply time of the standard gas to the physical adsorption type filter is shown. After creating the overcurve and the breaking curve, the standard gas is supplied from the standard gas supply means to the physical adsorption type filter that is the target of the life determination, and the gas that has passed through the physical adsorption type filter is supplied. The life of the physical adsorption type filter is determined by comparing the calculated collection efficiency and the breakthrough curve by collecting, measuring the concentration of a specific substance in the collected gas, and calculating the collection efficiency. It is characterized by making a judgment.

According to the present invention, there is provided a method for determining the life of a physical adsorption type filter and a device for determining the life of a physical adsorption type filter, which are easy to operate, can be carried out in a short time, and have high accuracy.

It is a perspective view of the honeycomb filter for deodorization which is an example of the physical adsorption type filter which is the object of the life determination method of this invention. It is a perspective view which shows the installation state of the deodorizing honeycomb filter shown in FIG. It is a graph which shows an example of the breakthrough curve created in the life determination method of the deodorizing honeycomb filter of this invention. It is a figure which shows typically the life determination apparatus of the deodorizing honeycomb filter shown in FIG. 1. It is a perspective view which shows an example of the jig used for the life determination method of the honeycomb filter for deodorization of this invention. It is a front view which shows an example of the life determination apparatus of the deodorizing honeycomb filter using the jig shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a deodorizing honeycomb filter 1 which is an example of a physical adsorption type filter which is a target of the life determination method of the present invention. The deodorizing honeycomb filter 1 is cubic or rectangular parallelepiped, and has a large number of pores 1a extending along the flow direction of air to be deodorized. Although not shown, the deodorizing honeycomb filter 1 carries or contains a catalytic substance. For example, as shown in FIG. 2, one or a plurality of deodorizing honeycomb filters 1 are arranged inside an exhaust duct 2 installed in a kitchen or a factory which is an odor source. The air sucked into the exhaust duct 2 from the kitchen or factory is discharged after passing through the deodorizing honeycomb filter 1. When air passes through the deodorizing honeycomb filter 1, the deodorizing honeycomb filter 1 physically adsorbs odorous substances (for example, acetaldehyde, trimethylamine, acetic acid, amines, ammonia, etc.) contained in the air. Then, the catalytic substance carried or contained in the deodorizing honeycomb filter 1 decomposes the adsorbed odorous substance. In this way, the air from which the odorous substance has been removed has passed through the deodorizing honeycomb filter 1 is discharged to the outside from the exhaust duct 2. The deodorizing honeycomb filter 1 needs to be replaced when the deodorizing ability is lowered. In order to grasp the appropriate timing of this replacement, it is necessary to determine the life of the deodorizing honeycomb filter 1. The method of determining the life of the deodorizing honeycomb filter 1 of the present embodiment will be described below.

In the method for determining the life of the deodorizing honeycomb filter 1 of the present embodiment, while supplying a standard gas to a physical adsorption type filter such as the deodorizing honeycomb filter 1, the gas that has passed through the physical adsorption type filter is collected and the collected gas is collected. It is carried out using the collection efficiency calculation step of measuring the concentration of a specific substance in the gas and calculating the collection efficiency by comparing with the concentration of the substance in the standard gas. The standard gas is a gas in which the mixing ratio of a specific substance (for example, an odorous substance) is known in advance. First, a diagram showing the relationship between the collection efficiency calculated multiple times by performing the collection efficiency measurement step for an unused physical adsorption type filter multiple times and the cumulative supply time of the standard gas to the physical adsorption type filter. Create a breakthrough curve as shown in 3. In multiple collection efficiency calculation steps to create a breakthrough curve, the gas that has passed through the physisorption filter while continuously supplying standard gas to the unused physisorption filter. Collection, measurement of the concentration of a specific substance in the collected gas, and calculation of collection efficiency are performed intermittently multiple times.

After creating the breakthrough curve in this way, a collection efficiency measurement step is performed on the physical adsorption type filter that is the target of life determination, and the calculated collection efficiency is compared with the breakthrough curve of the physical adsorption type filter. Determine the lifespan. In this way, when determining the life of the physical adsorption type filter, the remaining time of the life can be obtained depending on where the measured collection efficiency is located on the breakthrough curve. As an example, a point P1 having a minimum usable collection efficiency (about 58% in the example shown in FIG. 3) of the physical adsorption type filter to be determined for life is plotted on the breakthrough curve. Then, the point P2 corresponding to the measured collection efficiency of the physical adsorption type filter, which is the object of life determination, is investigated. On the breakthrough curve, the time interval t1 from the start of supply of the standard gas to the point P1 is the effective life of the physical adsorption type filter. On the other hand, the time interval t2 from the start of supply of the standard gas to the point P2 corresponds to the degree of performance deterioration due to the use of the physical adsorption type filter. Therefore, the remaining time of the life is obtained based on the ratio of the time interval t2 from the start of supply of the standard gas to the point P2 with respect to the time interval t1 from the start of supply of the standard gas to the point P1.

The method of determining the life of this physical adsorption type filter will be described in more detail. As described above, in order to create a breakthrough curve that serves as a reference for determining the life, a reference gas having a known concentration of a substance to be removed (for example, an odorous substance) is used in the unused deodorizing honeycomb filter 1. It is supplied from the upstream side (primary side) with a predetermined air volume (predetermined surface speed). Then, the gas that has passed through the deodorizing honeycomb filter 1 is collected on the downstream side (secondary side), and the concentration of the odorous substance in the collected gas is measured. As an example, the life determination device schematically shown in FIG. 4 is used. Specifically, a standard gas supply means containing the standard gas, for example, a bag 3 is arranged on the upstream side (primary side) of the deodorizing honeycomb filter 1. If necessary, a cylinder 6 for supplying standard gas to the bag 3 may be arranged on the upstream side of the bag 3. Then, the sampling bag (gas sampling means) 5 is arranged on the downstream side (secondary side) of the deodorizing honeycomb filter 1 via the pump 4. When the control means 15 operates the pump 4, the standard gas in the bag 3 is sucked and passed through the deodorizing honeycomb filter 1. Then, the gas that has passed through the deodorizing honeycomb filter 1 is collected (collected) in the sampling bag 5. In this way, the concentration of the odorous substance in the gas collected in the sampling bag 5 was measured on the downstream side (secondary side) of the deodorizing honeycomb filter 1 and compared with the concentration of the odorous substance of the reference gas known in advance. Find the collection efficiency. The reference gas is continuously supplied, during which the gas is collected on the downstream side (secondary side) of the deodorizing honeycomb filter 1 and the odorous substance collection efficiency is calculated continuously or intermittently. Then, the relationship between the cumulative supply time for supplying the reference gas and the collection efficiency of the odorous substance is represented in a graph, and a breakthrough curve as shown in FIG. 3 is created. This breaking curve serves as a reference for the life determination method of the deodorizing honeycomb filter 1 of the present embodiment. The minimum collection efficiency (lifeline) required for effective use of the deodorizing honeycomb filter 1 is set in advance. If the concentration of the odorous substance in the reference gas is low, it takes an enormous amount of time to create a breakthrough curve, so the reference gas should contain a very high concentration of the odorous substance. The concentration of the odorous substance in the reference gas is much higher than the concentration of the odorous substance in the air of the environment in which the deodorizing honeycomb filter 1 is actually installed.

As described above, after creating a breakthrough curve using the unused deodorizing honeycomb filter 1, a predetermined air volume is applied to the reference gas from the upstream side (primary side) of the deodorizing honeycomb filter 1 whose life is to be determined. Supply at. Then, the gas is collected on the downstream side (secondary side) of the deodorizing honeycomb filter 1 to calculate the collection efficiency of the odorous substance. This work is substantially the same as the step for creating the breakthrough curve, and should be performed using the above-mentioned collection efficiency calculation step, and the life should be actually determined from the unused deodorizing honeycomb filter 1. It only changes to the deodorizing honeycomb filter 1. However, if the cylinder 6 is unnecessary, the cylinder 6 may be omitted. The collection efficiency calculated from the gas collected on the downstream side (secondary side) of the deodorizing honeycomb filter 1 is compared with the breakthrough curve and the life line prepared in advance. If the calculated collection efficiency is below the life line, it is determined that the effective life of the deodorizing honeycomb filter 1 has already been reached, and the deodorizing honeycomb filter 1 should be stopped and replaced. Is determined to be necessary. On the other hand, when the calculated collection efficiency is higher than the life line, it is determined that the effective life of the deodorizing honeycomb filter 1 has not been reached, and the deodorizing honeycomb filter 1 can be continued to be used and is still replaced. Judge that it is unnecessary. Furthermore, it is confirmed where the calculated collection efficiency is located on the breakthrough curve. The breakthrough curve shows the state of decrease in collection efficiency from the start of use of the unused deodorizing honeycomb filter 1 to the point P1 at which the life line is reached. Therefore, the performance of the deodorizing honeycomb filter 1, which is the target of life determination, deteriorates depending on where the calculated collection efficiency is located on the breakthrough curve from the start of use to the point P1 where the life line is reached. It is possible to know the degree and estimate the remaining effective life that can be used in the future. At this time, the position of the point P2 on the breakthrough curve corresponding to the deodorizing honeycomb filter 1 which is the target of the life determination is determined only according to the collection efficiency which is the vertical axis of the graph. In setting the position of the point P2, the time on the horizontal axis of the graph is not taken into consideration. For example, the calculated collection efficiency is located at the point P2 between the start point of use and the point P1 on the breakthrough curve, and from the start of use to the point P1 where the point P2 reaches the life line on the horizontal axis representing time. If it is located exactly in the middle of the range, it is determined that the deodorizing honeycomb filter 1 has passed half of its effective life. Therefore, it is determined that the deodorizing honeycomb filter 1 can be continuously used for the same time as the actual cumulative usage time up to that point. If the cumulative usage time of the deodorizing honeycomb filter 1 is 3 years, it can be said that the honeycomb filter 1 should be replaced after being used for the next 3 years.

Further, when the point P2 is at the position of 1/3 of the range from the start of use to the point P1 reaching the life line on the horizontal axis representing time, the deodorizing honeycomb filter 1 has passed 1/3 of the effective life. Judge that it was done. Therefore, it is determined that the deodorizing honeycomb filter 1 can be continuously used for twice the cumulative usage time up to that point. If the cumulative usage time of the deodorizing honeycomb filter 1 is 3 years, it can be said that the honeycomb filter 1 should be replaced after being used for the next 6 years.

FIG. 3 shows the collection efficiency of the deodorizing honeycomb filter 1 having a cumulative usage time of 7 years, 10 years, and 13 years, respectively. Since all of these deodorizing honeycomb filters 1 are below the life line, it is determined that they need to be replaced immediately.

Based on such a life determination method, the actual cumulative usage time A of the deodorizing honeycomb filter 1 and the remaining time B of the effective life can be expressed by the following relational expression.
B = A × (1-t2 / t1) = A × (t1-t2) / t1
It is possible to determine the life based on this relational expression. The numerical values of the times t1 and t2 may be the actual time at the time of collecting the collection efficiency for creating the breakthrough curve, but may be the numerical values expressed with the time t1 as 1. The value of time t2 is a value obtained on a graph based on the calculated collection efficiency, and is not the actual cumulative usage time of the deodorizing honeycomb filter 1 which is the target of life determination.

In the conventional life determination method, it is only possible to determine whether or not the deodorizing honeycomb filter 1, which is the target of the life determination, has already reached the effective life and needs to be replaced. In addition to this, in the present embodiment, the remaining time of the effective life can be known by using the breakthrough curve. Therefore, the timing at which the deodorizing honeycomb filter 1 should be replaced can be known in advance, and the replacement schedule of the deodorizing honeycomb filter 1 can be set in advance. It is possible to prevent the replacement timing from being delayed.

In addition, in the conventional lifespan determination method, the odor is measured by a method that depends on the human sense of smell (for example, the three-point comparison type odor bag method). It took a long time to make a request and it was expensive. However, in the present embodiment, the life can be determined by measuring the concentration of a specific substance by a method that does not depend on human senses (for example, a gas detector tube method or the like). Since it is not necessary to ask a specialized analysis institution, it is possible to shorten the processing time and reduce the cost. The life of the deodorizing honeycomb filter (physical adsorption type filter) 1 can be determined in, for example, 10 minutes or less, and it is not necessary to carry the deodorizing honeycomb filter 1 to a test laboratory or the like, and the deodorizing honeycomb filter 1 does not need to be carried to a test laboratory or the like. It can be carried out in the field where the filter 1 is actually used. Further, in the present embodiment, instead of collecting sample air in an environment where the deodorizing honeycomb filter 1 which is the target of life determination is installed, standard gas is supplied to the deodorizing honeycomb filter 1 for deodorization. The gas that has passed through the honeycomb filter 1 is collected and the concentration is measured. Therefore, it is not affected by the environment in which the deodorizing honeycomb filter 1 is installed (for example, weather or temperature) or the menu (order) to be cooked, and is affected by changes in the undiluted odor concentration and accompanying changes in deodorizing efficiency. It is possible to determine the life with high accuracy.

A specific embodiment of the method for determining the life of the deodorizing honeycomb filter 1 described above will be described. In this embodiment, data was acquired for creating a breakthrough curve of the deodorizing honeycomb filter 1. As shown in FIG. 4, a cylinder 6 containing a standard gas containing a predetermined concentration (for example, 10 to 20 ppm) of ammonia and a large-capacity bag (for example, a Tedlar (registered trademark) bag) 3 connected to the cylinder 6 are combined. , It was arranged on the upstream side (primary side) of the unused deodorizing honeycomb filter 1. On the other hand, the pump 4 is arranged on the downstream side (secondary side) of the deodorizing honeycomb filter 1. Then, the pump 4 is operated to suck the standard gas through the deodorizing honeycomb filter 1, and the sucked gas is collected in the sampling bag (odor bag) 5 at regular intervals, and the gas detector tube method (for example, Kitagawa) is used. The concentration of ammonia was detected by the method using the formula detector tube 105SD). The downstream side of the pump 4 is not connected to the sampling bag 5 and is left open except when the gas is recovered at regular intervals. At the same time as the start of measurement, the two cocks (not shown) of the bag 3 are opened so as to be open in both directions of the cylinder 6 side and the deodorizing honeycomb filter 1 side. As a result, the deodorizing honeycomb filter 1 is continuously supplied with the standard gas at a predetermined air volume. It should be noted that this method is characterized in that it can always measure at atmospheric pressure and does not require pressure correction or the like. In this way, the concentration was detected a plurality of times, the collection efficiency was obtained based on the measurement results, and the breakthrough curve as shown in FIG. 3 was created. The deodorizing honeycomb filter 1 used at this time is preferably in a new state of the deodorizing honeycomb filter 1 that is actually subject to life determination, but if it is a product of the same type (same model number), it is manufactured in a different lot. It may be a product that has been manufactured.

After creating the breakthrough curve as shown in FIG. 3, the life of the deodorizing honeycomb filter 1 is determined using the same device (see FIG. 4) and the same standard gas as when creating the data for creating the breakthrough curve. conduct. The deodorizing honeycomb filter 1 which is the object of life determination is usually used for several months or several years or more. The deodorizing honeycomb filter 1 which is the target of the life determination is set in the life determination device shown in FIG. However, if the cylinder 6 is unnecessary, the cylinder 6 may be omitted from the life determination device shown in FIG. Then, the pump 4 is operated to pass the same standard gas as at the time of data creation for creating the breakthrough curve through the deodorizing honeycomb filter 1 and collect it in the sampling bag 5. The concentration of ammonia in the gas collected in the sampling bag 5 is detected by a gas detector tube method or the like. The concentration of the detected ammonia is compared with the concentration of ammonia in the standard gas to determine the collection efficiency. It is investigated where the collection efficiency obtained in this way is located on the breakthrough curve shown in FIG. Then, the point P2 on the fracture curve corresponding to the deodorizing honeycomb filter 1 which is the target of the life determination is obtained, and the above-mentioned relational expression B = A × (1-t2 / t1) = A × (t1-t2). The remaining time of the effective life is calculated based on / t1.

In the method for determining the life of the deodorizing honeycomb filter 1, the standard gas passes through the deodorizing honeycomb filter 1 in a closed system without being mixed with the atmosphere, and further, in this closed system, the deodorizing honeycomb filter 1 is used. It is necessary to prevent it from being adsorbed to a portion other than 1. In particular, it is preferable that the flow passage in the pump 4 can be removed and washed.

The standard gas preferably contains an odorous substance that causes a problem in the actual use of the deodorizing honeycomb filter 1, but other gases can be used as long as the gas contains a substance that can be adsorbed by the deodorizing honeycomb filter 1. .. However, in the case of gas for which the control concentration and allowable concentration are set, it is necessary to consider the risk of accidental gas leakage. Therefore, it is desirable to use a gas having a control concentration or less and an allowable concentration or less. Further, it is preferable that the detector tube generally on the market contains a substance having a concentration not exceeding the upper limit of the scale and not too thin. For example, a gas containing low concentrations of toluene, ammonia, formaldehyde and the like is preferably used.

In the life determination device as shown in FIG. 4, the front and rear of the deodorizing honeycomb filter 1, that is, the supply portion of the standard gas to the deodorizing honeycomb filter 1, and the connection portion between the deodorizing honeycomb filter and the pump are configured. An example of the jig is shown in FIG. The jig 7 has a pair of holding plates 8 facing each other, and elastic material layers 9 are provided on the facing surfaces of the holding plates 8 respectively. Through holes 10 are formed in the elastic material layer 9 and the holding plate 8. In this way, the holding plate 8 having the elastic material layer 9 is attached to the slider 12 via the attachment member 11. The slider 12 is slidably attached to the long rail 13. Therefore, the slider 12, the mounting member 11, the elastic material layer 9, and the holding plate 8 can be integrally moved along the rail 13. By moving along the rail 13, the pair of elastic layers 9 and the holding plate 8 can move toward and away from each other.

FIG. 6 shows an example in which the life determination device as shown in FIG. 4 is configured by using the jig 7 shown in FIG. In this device, a pair of elastic material layers 9 and holding plates 8 are moved along the rail 13 to sandwich the deodorizing honeycomb filter 1, and the elastic material layers 9 are brought into close contact with both sides of the deodorizing honeycomb filter 1. A connecting pipe 14 is attached to the surface of the holding plate 8 opposite to the elastic material layer 9, and communicates with the elastic material layer 9 and the through hole 10 of the holding plate 8. The bag 3 containing the standard gas is connected to the elastic material layer 9 arranged on the upstream side (primary side) of the deodorizing honeycomb filter 1 and the connecting pipe 14 protruding from the holding plate 8. On the other hand, the pump 4 is connected to the connecting pipe 14 protruding from the elastic material layer 9 and the holding plate 8 arranged on the downstream side (secondary side) of the deodorizing honeycomb filter 1, and the pump 4 is sampled via the connecting pipe 14. Connect the bag 5. Using this device, the life determination method described above is carried out. When the jig 7 shown in FIG. 5 is used, the elastic material layer 9 is brought into close contact with the surface of the deodorizing honeycomb filter 1 so that it does not leak to other than the through hole 10 and the connecting pipe 14, and is highly accurate and highly efficient. Collection efficiency can be measured.

According to the present invention, the deodorizing honeycomb is not affected by the installation location (kitchen, factory, etc.) of each deodorizing honeycomb filter 1, the menu (order) at the time of life determination, the original odor concentration which greatly fluctuates depending on the weather, and the like. The remaining time of the effective life of the filter 1 can be determined.

In the above description, the life determination of the deodorizing honeycomb filter 1 is illustrated, but the present invention is not limited to this, and can be applied to the life determination of the entire physical adsorption type filter. Therefore, the measurement target of the collection efficiency is not limited to the odorous substance, and may be another substance.

1 Honeycomb filter for deodorization (physisorption type filter)
1a Pore 2 Exhaust duct 3 Bag (standard gas supply means)
4 Pump 5 Sampling bag (gas sampling means)
6 Cylinder (standard gas supply means)
7 Jig 8 Holding plate 9 Elastic material layer 10 Through hole 11 Mounting member 12 Slider 13 Rail 14 Connection pipe 15 Control means

Claims (10)

While supplying a standard gas to the physical adsorption type filter, the gas that has passed through the physical adsorption type filter is sampled, the concentration of a specific substance in the collected gas is measured, and the concentration of the substance in the standard gas is measured. Includes a collection efficiency calculation step that calculates the collection efficiency in comparison with
The collection efficiency measurement step is performed a plurality of times on an unused physical adsorption type filter, and the relationship between the collection efficiency calculated multiple times and the cumulative supply time of the standard gas to the physical adsorption type filter is shown. Create a breakthrough curve
After creating the breakthrough curve, the collection efficiency measurement step is performed on the physical adsorption type filter that is the target of the life determination, and the calculated collection efficiency is compared with the breakthrough curve to be compared with the physical adsorption type. A method for determining the life of a physical adsorption type filter, which comprises determining the life of a filter. The method for determining the life of a physical adsorption type filter according to claim 1, wherein the determination of the life of the physical adsorption type filter can be carried out at a site where the physical adsorption type filter is used. The method for determining the life of a physical adsorption type filter according to claim 1 or 2, wherein the determination of the life of the physical adsorption type filter can be performed in a time of 10 minutes or less. In the multiple collection efficiency calculation steps for creating the breakthrough curve, the physical adsorption type filter is applied while the standard gas is continuously supplied to the unused physical adsorption type filter. Any of claims 1 to 3, wherein the collected gas is collected, the concentration of the substance in the collected gas is measured, and the collection efficiency is calculated intermittently a plurality of times. The method for determining the life of a physical adsorption type filter according to item 1. When determining the life of the physical adsorption type filter that is the object of the life determination, it is characterized in that the remaining time of the life is obtained depending on where the measured collection efficiency is located on the breakthrough curve. The method for determining the life of a physical adsorption type filter according to any one of claims 1 to 4. The point P1 of the minimum usable collection efficiency of the physical adsorption type filter, which is the target of the life determination, is plotted on the breakthrough curve.
The point P2 corresponding to the measured collection efficiency of the physical adsorption type filter to be determined for the life is investigated, and the time interval t1 from the start of supply of the standard gas to the point P1 on the breakthrough curve is obtained. The method for determining the life of a physical adsorption type filter according to claim 5, wherein the remaining time of the life is obtained based on the ratio of the time interval t2 from the start of supply of the standard gas to the point P2. The relationship between the actual cumulative usage time A of the physical adsorption type filter, which is the target of the life determination, and the remaining time B of the effective life is B = A × (t1-t2) / t1. The method for determining the life of the physical adsorption type filter according to claim 6. The life determination of the physical adsorption type filter according to any one of claims 1 to 7, wherein the physical adsorption type filter is a deodorizing honeycomb filter, and the substance for measuring the concentration is an odorous substance. Method. A standard gas supply means containing standard gas, which is connected to the upstream side of the physical adsorption type filter, a gas sampling means for collecting gas that has passed through the physical adsorption type filter, and a specific substance in the collected gas. It has a control means for measuring the concentration of the substance and calculating the collection efficiency in comparison with the concentration of the substance in the standard gas.
The control means collects and collects gas that has passed through the physical adsorption type filter while continuously supplying the standard gas from the standard gas supply means to an unused physical adsorption type filter. The concentration of a specific substance in the gas was measured and the collection efficiency was calculated intermittently multiple times, and the collection efficiency calculated multiple times and the standard gas to the physical adsorption type filter were obtained. In addition to creating a breakthrough curve showing the relationship with the cumulative supply time,
After creating the breakthrough curve, the standard gas is supplied from the standard gas supply means to the physical adsorption type filter that is the target of the life determination, and the gas that has passed through the physical adsorption type filter is collected and collected. The concentration of a specific substance in the gas is measured and the collection efficiency is calculated, and the calculated collection efficiency is compared with the breakthrough curve to determine the life of the physical adsorption type filter. A device for determining the life of a physical adsorption type filter. It has a pair of holding plates facing each other, an elastic layer provided on the facing surfaces of the holding plates, and a through hole penetrating the elastic layer and the holding plate. The elastic layer and the holding plate are further provided with a jig that can be moved to move closer to or further from each other.
One of the elastic material layer and the holding plate is arranged on the upstream side of the physical adsorption type filter, and the elastic material layer and the through hole of the holding plate are connected to the standard gas supply means.
The other elastic material layer and the holding plate are arranged on the downstream side of the physical adsorption type filter, and the elastic material layer and the through hole of the holding plate are connected to the gas sampling means. The device for determining the life of the physical adsorption type filter according to claim 9.

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