KR20210076806A - Organic solvent concentration device and method for judging deterioration of organic solvent concentration device - Google Patents

Abstract

The present invention provides a method capable of reducing the time until deterioration determination and also reducing the hassle of drilling by simplifying a method of determining the deterioration of a VOC adsorption honeycomb rotor. According to the organic solvent concentrating apparatus and the method for determining deterioration of the organic solvent concentrating apparatus of the present invention, only by measuring the amount of organic matter accumulation by TG/DTA, a static adsorption rate can be predicted without performing a VOC static adsorption test, the method of determining the deterioration of the VOC concentrating rotor can be simplified, and the trouble and time of the investigation can be reduced. According to the present invention, 20 to 100 mm is taken out from the entire VOC adsorption honeycomb rotor in the thickness direction, or both ends or either end of the treatment inlet side and the treatment outlet side toward the center in the thickness direction of the VOC adsorption honeycomb rotor.

Description

Deterioration determination method of an organic-solvent concentrating apparatus and an organic-solvent concentrating apparatus TECHNICAL FIELD OF ORGANIC SOLVENT CONCENTRATION DEVICE AND METHOD FOR JUDGING DETERIORATION OF ORGANIC SOLVENT CONCENTRATION DEVICE

The present invention relates to a method for determining the degree of progress of deterioration, which leads to deterioration in performance due to long-term use or the like of an organic solvent concentrating apparatus.

Recently, air pollution has become a problem on a global scale, and VOC (Volatile Organic Compounds, hereinafter VOC) such as toluene is one of them, and it occurs a lot in a painting process or a printing factory. If discharged as it is, VOC itself is not only harmful, but it is also the causative material of PM2.5, which may lead to serious health damage.

There is a problem that not only the facility becomes very large when the amount of air to be treated increases in the treatment facility (combustion facility or recovery facility) of the exhaust gas containing a low concentration of VOC, but also a vast running cost is required. On the other hand, the VOC concentrator as a front-end device of the exhaust gas treatment facility can concentrate and recover low-concentration and large-air volume VOC exhaust gas at high concentration and low air volume, thereby increasing the facility cost and running cost of the entire treatment facility. width can be reduced, and efficient VOC processing can be realized.

As one of such VOC concentration technologies, there is a honeycomb adsorption technology. As one of the VOC concentrators, there is a honeycomb rotor type VOC concentrator that selectively absorbs and concentrates VOCs in exhaust gas. 1 is an example of a VOC concentration recovery flow. The VOC adsorption honeycomb rotor 1 is divided into a treatment zone 2 , a regeneration zone 3 , and a cooling zone 4 . By rotating the VOC adsorption honeycomb rotor 1, VOC can be continuously adsorbed, removed, concentrated and desorbed. When VOC in the process gas passes through the process zone 2 of the VOC adsorption|suction honeycomb rotor 1, it is adsorbed and removed. When the adsorbed honeycomb rotates to the regeneration zone 3, the adsorbed VOC is 1/5 to 1/15 of the treated air volume, 200°C or less of the air volume, and the temperature is set to "Celsius") It is concentrated and desorbed 15 times, and sent to a combustion processing apparatus (not shown). The honeycomb that has passed through the regeneration zone 3 moves to the cooling zone 4, is cooled, and moves to the processing zone 2 again. The air that has passed through the cooling zone 4 is heated by the regeneration heater 7 and used as VOC desorption air.

In general, VOC adsorption honeycomb rotors are supported with hydrophobic zeolite and are regenerated by hot air around 200° C., so that adsorption and regeneration can be repeated. On the other hand, the composition of VOC in exhaust gas varies because it is included in printing, electronic component manufacturing, semiconductor manufacturing, liquid crystal manufacturing, exhaust gas treatment of painting booths and large-scale research facilities, and the like. By repeating the adsorption/desorption of various VOCs, the VOC adsorption honeycomb rotor deteriorates due to long-term use, etc., and the performance gradually deteriorates.

Generally, the following causes are considered to the deterioration phenomenon of an adsorbent.

(a) Partial loss of micropores due to semi-melting phenomenon

(b) Coating or occlusion by carbon, polymer, compound, etc. on the surface of the adsorbent and in the micropores

(c) Reduction of crystal micropores by chemical reaction

Most of the causes of performance deterioration of the VOC adsorption honeycomb rotor are due to (b). Not only when the components such as paints or inks used contain components that polymerize, but also in VOCs that do not specifically polymerize, through repeated adsorption and desorption for a long period of time, a chemical reaction gradually occurs to solidify and accumulate, and finally Possibility of changing into a non-desorbable material can be considered.

The cause of deterioration of the VOC adsorption honeycomb rotor is greatly influenced by actual use conditions (operation period, amount of organic solvent used, corrosive gas content, etc.). The deterioration of the VOC adsorption honeycomb rotor If left unattended, the concentration recovery rate of the VOC concentrator itself will fall, and since a concentrated gas concentration will become low concentration, the running cost of a combustion apparatus will become high. Moreover, there exists a possibility that the VOC density|concentration after a process rises and it may affect also environmental standards. Moreover, it is also possible to replace|exchange the VOC adsorption|suction honeycomb rotor at a predetermined frequency when performance falls, but if the replacement frequency is high, maintenance cost will become high.

In the VOC adsorption honeycomb rotor, performance degradation can be judged by measuring the VOC concentration on the treatment outlet side during operation and obtaining the removal efficiency, but the influence of load fluctuations of the device itself and the state of peripheral equipment cannot be excluded. However, it is difficult to grasp the deterioration of the performance of the VOC adsorption honeycomb rotor purely. In addition, if the operation is continued with substances (hereinafter referred to as accumulations) adhered to it by hot air in the regeneration zone, it not only causes an increase in pressure loss, but also poses a risk of ignition of the honeycomb rotor. Therefore, there is known a method in which a portion of elements of a VOC adsorption honeycomb rotor is sampled, and the cause of performance degradation or a current adsorption state is investigated to determine the degree of deterioration (Non-Patent Document 1).

Similarly, in a dehumidifying device using a honeycomb rotor, as in Patent Document 1, the correlation between the absolute humidity at the inlet of the process air at the initial stage in which the rotor is not deteriorated and the amount of dehumidification, and the correlation at the time of diagnosis in a state in which the deterioration of the rotor has progressed. Although there is a deterioration judgment method of continuously diagnosing the progress of deterioration of the rotor by comparing the relationship, since the subject of the treatment is water and the use environment is different from the VOC concentrator made as the object of the present invention in a dry room, VOC The property is different from the deterioration determination method in the concentrating apparatus. In addition, although it is possible to diagnose the deterioration of the rotor, there is also a problem in that it is difficult to guess the cause of the deterioration of the rotor or what kind of phenomenon is occurring in the rotor itself.

Although the deteriorated VOC adsorption honeycomb rotor can be replaced, it is difficult to suddenly secure a budget because the rotor itself is relatively expensive, and the production or manufacturing is temporarily stopped due to the suspension of the exhaust gas treatment facility for rotor replacement. It is practically undesirable to happen as a sudden event. By predicting in advance the timing of replacement of the VOC adsorption honeycomb rotor by performing periodic deterioration determination, it is possible to systematically manage the cost of the rotor replacement operation.

An example of the conventional deterioration determination method is demonstrated. First, as shown in Fig. 2, a part of the VOC adsorption honeycomb rotor 1 is drilled using a cylindrical jig 9, extracted and sampled. The drilling element 10 in the rotor thickness direction (axial direction), along the air flow direction in the processing zone 2 of the VOC adsorption honeycomb rotor 1 of FIG. 1 , the processing inlet side 11 and processing Two locations on the exit side 12 are cut to a predetermined size to obtain a deteriorated honeycomb specimen (about several tens of g). At this time, since the surface of the rotor is subjected to a cross-section treatment for the purpose of improving sliding properties and strength, it may be cut out from a distance of 10 mm or more from both ends of the rotor surface on the treatment inlet side and the treatment outlet side toward the center of the rotor thickness direction. In addition to the treatment inlet side and the treatment outlet side, the deteriorated honeycomb specimen may be further cut out from the central portion in the rotor thickness direction.

Using these deterioration honeycomb specimens, the progress of deterioration is investigated by examining the following items (hereinafter, deterioration determination method).

(A) VOC static adsorption test

(B) Measurement of organic matter accumulation by TG/DTA (Thermogravimetry/Differential Thermal Analysis, Simultaneous Thermogravimetric and Differential Thermal Analysis; hereafter referred to as TG/DTA)

(A) VOC static adsorption test

The deteriorated honeycomb specimens on the treatment inlet side 11 and the treatment outlet side 12, and a new honeycomb specimen of the same type for comparison are pre-treated at the regeneration temperature of the honeycomb rotor (for example, 200° C.) for a certain period of time. After heating, at least one VOC selected from acetone, toluene, and the like is left still in a saturated desiccator and adsorbed to a saturated state. From the weight difference of the honeycomb specimen before and after adsorption, the VOC adsorption rate of each honeycomb specimen is obtained, and the adsorption rate of the new honeycomb specimen is set to 100%, and the static adsorption rate γ [%] of the deteriorated honeycomb specimen is calculated. . That is, it becomes as follows (1) Formula.

W _ads : weight of VOC adsorbed by deteriorated honeycomb specimen, W _sample : weight of deteriorated honeycomb specimen, M _ads : weight of VOC adsorbed by new honeycomb specimen, M _virgin : weight of new honeycomb specimen, all in [g].

(B) Measurement of organic matter accumulation by TG/DTA

TG/DTA measures the change in weight and heat quantity of the sample when the sample is heated at a constant rate. Observe the temperature range and weight change in which the endothermic change (e.g., dehydration/decomposition) and exothermic change (e.g., combustion) of the sample occurs. phenomenon can be observed. After adjusting the honeycomb specimen to a predetermined amount (eg, about several tens of mg), it is provided to a TG/DTA measuring device. 3 is an example of a measurement result. From the measurement result, the exothermic (combustion) peak of DTA in the vicinity of 400°C of the deteriorated honeycomb specimen on the treatment inlet side 11 was confirmed, and the weight reduction of TG was also confirmed. Accordingly, it can be confirmed that accumulations that cause deterioration of the rotor performance are accumulated in the VOC adsorption honeycomb rotor. TG weight reduction rate α _TG [%] is a predetermined temperature (T2) analyzed by TG/DTA measurement from the weight of the honeycomb specimen at a temperature (T1) (for example, 200°C) near the regeneration temperature. The reduced weight obtained by reducing the weight of the sample of the honeycomb specimen after combustion at (for example, 700°C) is calculated by the calculation formula (2) divided by the initial total weight of the sample.

m _T1-T2 : The reduced weight in _{T1-T2, m sample} : The initial total weight of the sample, all in [g].

(A) The amount of specimen required for the VOC static adsorption test is about several tens of g and about φ60mm in diameter and several tens of mm in diameter. On the other hand, in (B) measurement of the amount of accumulation of organic matter by TG/DTA, a very small amount of about several tens of mg may be sufficient.

Patent Document 1: Japanese Patent Publication No. 3753752

Non-Patent Document 1: "Deterioration phenomenon of VOC adsorption and concentration rotor and its evaluation", Separation Technical Conference Banquet 2018 Technology and Research Presentation Lecture Summary, p.33

In the conventional degradation determination method (A) for the VOC static adsorption amount test, it was necessary to drill a drilling element with a diameter of about φ60 mm from a VOC adsorption honeycomb rotor (diameter φ0.5 to 4.5m). If the honeycomb rotor is left as it is after drilling, it will cause leakage and cause performance degradation, so backfilling with a backfilling element or caulking of the same size as the drilling element or caulking is required, and it takes time and trouble from drilling to backfilling. Because of the cost, the time to stop the VOC concentrator becomes longer, and the downtime of the user's production line becomes longer by that much. Here, as a deteriorated honeycomb specimen, it is conceivable that at least several tens of mm are drilled from both ends of the treatment inlet side and the treatment outlet side toward the center of the thickness of the rotor, which is necessary to leave a part of the center of the rotor, but the hole is drilled with a diameter of about 60 mm Since the diameter is large, it is difficult to fill only by caulking, and again a backfilling element is required.

In addition, for the analysis, the perforated element is cut to a required size, and since it takes time and trouble to analyze two types of (A) VOC static adsorption amount test, and (B) organic matter accumulation amount measurement by TG/DTA, VOC adsorption It takes time to examine the deterioration progress of the honeycomb rotor and make a judgment, and until the deterioration progress is found, the operation of the VOC concentrator is stopped, or even the user's production line has to be stopped. there was.

In view of the above circumstances, the present invention can reduce the time and trouble from drilling to determination by simplifying the method for determining deterioration of the VOC adsorption honeycomb rotor, and additionally, the timing of rotor replacement and performance recovery measures. The purpose of this is to provide a method for predicting

The inventors have been accumulating data by conducting deterioration determination investigations of hundreds or dozens of specimens over several years by a conventional deterioration determination method. In order to solve the above problems, the inventors have intensively analyzed and reviewed the data, based on the experience and discovery of the accumulation of a large amount of data and abundant degradation determination investigation, as a result of (A) the static adsorption ratio γ of the VOC static adsorption amount test, _{and (B) the TG weight reduction rate α TG} in the measurement of organic matter accumulation by TG/DTA. It was found that there is a correlation, and that the correlation can be theoretically derived from the theoretical equation of adsorption.

(Effects of the Invention)

According to the deterioration determination method according to the present invention, the investigation method of the deterioration determination of the VOC-concentrated rotor can be simplified, the complexity and time of analysis can be reduced, and it becomes possible to predict the timing of rotor replacement or performance recovery measures.

1 is an example of a VOC concentration recovery flow.
Fig. 2 is a diagram showing partial sampling of a VOC adsorption honeycomb rotor and cutting out a deteriorated honeycomb specimen from a drilling element in the conventional deterioration determination method.
3 : is an example of the organic matter accumulation amount measurement result by TG/DTA.
4 is a graph showing the correlation between (A) the static adsorption ratio γ in the VOC static adsorption test, and (B) the TG weight reduction rate α _{TG in the organic matter accumulation measurement by TG/DTA.}
Fig. 5 is a diagram showing a cartridge type VOC adsorption honeycomb rotor according to Example 2 of the present invention.
Fig. 6 is a graph showing the correlation between the static adsorption ratio γ or the TG weight reduction rate α _TG according to Example 3 of the present invention, and the correlation shown by an approximate curve of the operating period of the VOC adsorption honeycomb rotor.

The correlation between (A) the static adsorption ratio γ in the VOC static adsorption test and (B) the TG weight reduction rate α _TG in the organic matter accumulation measurement by TG/DTA, discovered by the inventors of the present invention, will be described. Here, it is confirmed that the above correlation holds true regardless of the type and loading amount of hydrophobic zeolite used in the VOC adsorption honeycomb rotor as the adsorbent, the cutting position of the deteriorated honeycomb specimen, and the type of VOC adsorbed.

Fig. 4 is a graph showing an approximate straight line of the correlation between (A) the static adsorption ratio γ in the VOC static adsorption amount test, and (B) the TG weight reduction rate α _{TG in the organic matter accumulation measurement by TG/DTA.} The approximate straight line in Fig. 4 is obtained by plotting the accumulated test data of hundreds of thousands of samples, and obtaining the correlation between the two as a linear relationship (approximate straight line) expressed by Equation (3) by the least squares method. Further, when the accumulation weight was 0 g, that is, when the TG weight reduction rate α _TG was 0%, the static adsorption ratio γ = 100%. In addition, the value of the constant A differs according to a user's process gas component, usage conditions, etc.

γ: static adsorption rate [%], α _TG : TG weight loss rate [%], A: constant

However, the correlation equation (3) is an empirical equation based on the empirical side, and the equation is extrapolated to the graph. Accordingly, the inventors have verified that the above correlation holds true even theoretically.

A person skilled in the art can derive an approximate expression according to the following method. In the process of deriving an approximate expression from a theoretical expression, the inventors presupposed the following four assumptions. Adsorption does not occur on the accumulation phase (Assumption 1), VOCs are uniformly adsorbed in a multi-molecular layer on the honeycomb specimen (Assumption 2), Adsorption parameter C in the BET theoretical equation (after the first adsorption layer and the second adsorption layer) (a parameter representing the difference in the heat of adsorption) is assumed to be constant (assumption 3), and the accumulation is assumed to be one type (assumption 4).

Based on the above assumptions, (A) the static adsorption ratio γ of the VOC static adsorption amount test, and (B) the TG weight reduction rate α _TG of the organic matter accumulation measurement by TG/DTA were derived from an approximate relationship. Hereinafter, unless otherwise specified, the weight is [g].

In the above formula (1), if the deteriorated honeycomb specimen weight W _sample and the new honeycomb specimen weight M _virgin approximate equally, it becomes the equation (1)'.

In addition, the VOC weight W _ads adsorbed by the deteriorated honeycomb specimen can be expressed as in Equation (4) using the _{VOC weight W notads} that cannot be adsorbed to the deteriorated honeycomb specimen.

M _ads : Weight of VOC adsorbed by new honeycomb specimen, W _notads : Weight of VOC that cannot be adsorbed by deteriorated honeycomb specimen

_{Here, the VOC weight, W notads} , which cannot be adsorbed to the deteriorated honeycomb specimen is shown in Equation (5) from the BET theoretical equation.

V _notads : Amount of monomolecular VOC that cannot be adsorbed to the deteriorated honeycomb specimen, C: Adsorption parameter C (constant) in the BET theoretical equation due to adsorption interaction, etc., P: VOC partial pressure, P ₀ : VOC initial saturated vapor pressure

On the other hand, the amount of monomolecular adsorption V _notads that cannot be adsorbed to the deteriorated honeycomb specimen is shown in the equation (6) from the Langmuir equation.

a: adsorption equilibrium constant, b: saturated adsorption amount

When the specific surface area S _{notads is expressed using V notads} , it becomes as in Equation (7).

S _notads : Specific surface area that cannot be adsorbed to the deteriorated honeycomb specimen, σ _VOC : Adsorption cross-sectional area of VOC

_{Since the specific surface area S notads} which cannot be adsorbed to the deteriorated honeycomb specimen and the specific surface area S _acc to which the accumulated matter adheres are equal, it becomes Equation (8).

S _acc : specific surface area to which accumulations are attached

If Equation (7) is made to correspond to Equation (8), it becomes Equation (9).

V _acc : adsorption amount of monolayer accumulation, σ _acc : adsorption cross-sectional area of accumulation

Here, in the formula (2) expressing the TG weight reduction rate α _{TG , if the reduced weight m T1-T2} in T1 to T2 is equal to the accumulated weight m _{acc ,}

is expressed as Assuming that the accumulation adsorbs only the first layer,

If Equation (9) is transformed using Equation (2)' and Equation (10), it becomes Equation (11).

Substituting equation (11) into equation (5) _{and assuming that the initial total weight m sample} and P of the TG/DTA measurement sample are constant,

D: constant

_{, and the VOC weight W notads} that cannot be adsorbed on the deteriorated honeycomb specimen becomes a function of the initial total weight m _{sample of the TG/DTA measurement sample.}

Finally, (1) is obtained from (1)', (4) and (12),

Here, in equation (13), when E=D/M _adsХ 100 (constant), equation (14) is derived.

γ: static adsorption ratio [%], α _TG : TG weight loss ratio [%], E: constant

As described above, it was found that the correlation between (A) the static adsorption ratio γ in the VOC static adsorption test and (B) the TG weight reduction rate α _{TG in the organic matter accumulation measurement by TG/DTA is theoretically linear.} .

Here, when the correlation equation (3) showing the correlation obtained from the test data is compared with the approximate equation (14) obtained theoretically, the constant A in the (3) equation corresponds to the constant E in the (14) equation are doing As described above, both experimentally and theoretically, it was shown that a linear correlation equation was established between the static adsorption rate γ and the TG weight loss rate α _TG.

According to the correlation of equation (3), the other result can be predicted by performing only either one of (A) VOC static adsorption test or (B) measurement of organic matter accumulation by TG/DTA. In the present invention, the point where the degradation determination method can be simplified is that (B) if only the organic matter accumulation by TG/DTA is measured, (A) the static adsorption ratio γ by the VOC static adsorption test can be predicted, (A) The point is that the VOC static adsorption amount test can be omitted. Since correlation (3) has been shown to hold theoretically, it becomes possible not only to simplify the empirical deterioration determination method, but also theoretically transfer the deterioration determination method to only TG/DTA measurement. (A) Since the VOC static adsorption amount test requires a certain amount of the specimen, it takes time and trouble for sampling of the perforated element, cutting the honeycomb specimen, preparing and preparing the measurement, and the measurement itself. On the other hand, (B) the amount of honeycomb specimens for measuring the amount of organic matter accumulation by TG/DTA needs to be very small, and the sampling also needs only a small amount, so the preparation and preparation for the measurement and the measurement itself do not require much time and trouble.

By setting the static adsorption ratio γ serving as a reference value for recommending VOC adsorption honeycomb rotor replacement or performance recovery measures, the corresponding TG weight reduction rate α _TG is obtained from the above correlation equation (3), and the rotor from only the TG/DTA measurement results It may be possible to determine whether replacement is recommended or the timing of performance recovery measures. _{Alternatively, if the TG weight reduction rate α TG} , which is a reference value for recommending rotor replacement or performance recovery measures, is set in advance, (B) Only measure the amount of organic matter accumulation by TG/DTA, and correlate as necessary as a reference. You may make it estimate by calculating the static adsorption ratio (gamma) from Formula (3).

[Example 1]

(A) Since the VOC static adsorption amount test requires a honeycomb specimen amount of about several tens of g, the conventional degradation determination method drills a perforated element about φ60 mm from the VOC adsorption honeycomb rotor, and calculates the thickness of the honeycomb specimen as an example. For example, it was necessary to cut it to about 10mm. On the other hand, according to the degradation determination method of the present invention, (B) since it is only necessary to measure the amount of accumulated organic matter by TG/DTA, it is sufficient if the weight of the sample of the honeycomb specimen is about several tens of mg. Therefore, although the hole diameter of the honeycomb specimen is sufficient to be several mm, if the diameter is too small when drilling all the thickness direction of a honeycomb rotor, it will become easy to break in the middle of drilling. For this reason, in consideration of workability, the drilling of the sample is preferably about φ15 to 30mm. In the case of drilling about φ15 to 30 mm, it is not necessary to backfill the drilled portion with the backfilling element, and the drilled hole may be covered by caulking or the like. For this reason, compared with the conventional sampling method, it is simple and does not take time and trouble for drilling. However, even if the entire rotor thickness direction is not perforated, only a required portion may be perforated, for example, by about 20 to 100 mm in the thickness direction from both ends of the treatment inlet side and the treatment outlet side toward the center portion in the thickness direction, respectively. In this case, you may drill with a cork borer etc. of about (phi) 5-20 mm, and the drilling method becomes simple. Further, since the central portion in the thickness direction of the rotor remains, there is no need to cover it with caulking or the like. Thereby, although a slight drift occurs, the influence is very slight, and there is no problem in the ventilation of the entire rotor. In addition, when examining the progress of deterioration only on the treatment inlet side or only on the treatment outlet side, only a required portion from any one end may be drilled.

[Example 2]

Analysis for the determination of deterioration needs to be performed regularly, and it is cumbersome to drill the element each time . VOC adsorption honeycomb A VOC adsorption honeycomb in which a perforated element is previously inserted into a heat-resistant, for example, metallic pipe, etc. (hereinafter referred to as "cartridge") to facilitate separation (desorption), installation, or replacement of the rotor part As shown in Fig. 5, the rotor 1 is inserted and fixed with a strength not to be blown away by the air flow, It may be "cartridge type". In this case, the hole generated when the cartridge 13 is taken out may be filled with caulking or replaced with a new cartridge.

Depending on the conditions of the processing gas or the like, the number of times of deterioration irradiation may be estimated, and the number of cartridges or the number of cartridges exceeding the number of times may be provided. At this time, the installation position may be the central portion in the radial direction of the honeycomb rotor as shown in FIG. 5, or may be provided equally. However, it is not limited to this.

[Example 3]

Determination of deterioration is made at least once according to the above deterioration determination method, and deterioration is determined based on the condition of the process gas component, the operating period of the VOC adsorption honeycomb rotor, the timing of the deterioration determination, the determination result, and the recommended value for replacing the rotor or recommended value for performance recovery measures, etc. By diagnosing the progress or trend, the timing of VOC adsorption honeycomb rotor replacement or performance recovery measures can be predicted. As the performance recovery measure, for example, by regenerating the rotor at a temperature higher than the regeneration temperature, a method of recovering the performance by removing the accumulated material that is not desorbed even at the regeneration temperature of around 200°C is mentioned.

As a result of the deterioration determination investigation of hundreds of samples carried out by the inventors over several years by conventional methods, as shown in FIG. 6 , for the static adsorption ratio γ or the TG weight reduction rate α _TG , an approximate curve of the operating period of the VOC adsorption honeycomb rotor It can be seen that the correlation shown by However, the approximation curve differs in various ways depending on the user's process gas component, usage conditions, and the like.

In order to predict the timing of VOC adsorption honeycomb rotor replacement or performance recovery measures, the process gas composition and operating conditions need to be constant to some extent during the rotor operation period, but the conditions usually do not change significantly. When the static adsorption ratio γ that becomes the recommended value for rotor replacement or the recommended performance recovery measure is determined, the corresponding TG weight reduction rate α _TG is obtained from the correlation equation (3), so (A) VOC static adsorption test is performed (B) only by measuring the amount of organic matter accumulation by TG/DTA, the timing of VOC adsorption honeycomb rotor replacement or performance recovery action can be estimated from the above approximate curve and the recommended rotor replacement value or performance recovery action value. _{On the other hand, if the TG weight reduction rate α TG} , which is the recommended value for rotor replacement or the recommended value for performance recovery measures, is set in advance, (B) Only the accumulation of organic matter is measured by TG/DTA, and the above approximate curve and rotor replacement are recommended in the same way. From the value, it is possible to infer the recommended timing of rotor replacement or the timing of performance recovery measures.

(industrial applicability)

According to the organic solvent concentrating apparatus and the deterioration determination method of the organic solvent concentrating apparatus of the present invention, the static adsorption ratio can be predicted without performing the VOC static adsorption amount test only by measuring the accumulation amount of organic matter by TG/DTA, The deterioration determination method can be simplified, the trouble and time of drilling work and deterioration determination investigation can be reduced, and rapid deterioration determination becomes possible.

1 VOC adsorption honeycomb rotor
2 processing zone
3 play zone
4 cooling zone
5 pre-filter
6 processing fan
7 Regenerative Heater
8 play fan
9 jig
10 perforated element
11 Treatment inlet side honeycomb specimen
12 Treatment outlet side honeycomb specimen
13 cartridges

Claims (6)

In the determination of the degree of deterioration of the perforated element punched from the VOC adsorption honeycomb rotor, based on (A) VOC static adsorption amount test, and (B) organic matter accumulation amount measurement by TG/DTA, to the correlation equation obtained in advance Based on the basis, (A) VOC static adsorption amount test or (B) organic matter accumulation amount measurement by TG/DTA is performed only to predict the test result of the other one, and organic matter to judge the progress of deterioration A method for determining deterioration of a solvent concentration device. The method according to claim 1,
The deterioration determination method of the organic-solvent concentration apparatus which calculates|requires the said correlation expression as a linear relationship by the least squares method. The method according to claim 1 or 2,
The drilling element is a cylindrical drilling jig of φ5-30 mm, from the entire thickness direction of the VOC absorption honeycomb rotor, or both ends or one end of the treatment inlet side and the treatment outlet side toward the center of the VOC absorption honeycomb rotor thickness direction A method for determining deterioration of an organic solvent concentration device characterized in that it is taken out by 20 to 100 mm. The VOC adsorption honeycomb rotor of the organic solvent concentrating device is determined at least once or more by the degradation determination method according to any one of claims 1 to 3, and from the determination result and the recommended rotor replacement value or performance recovery measure recommended value. A method for judging deterioration of an organic solvent concentrating device that predicts the timing of replacement or the timing of performance recovery measures. An organic solvent concentrating apparatus characterized by determining the degree of deterioration of the VOC adsorption honeycomb rotor by the deterioration determination method according to any one of claims 1 to 4. 6. The method of claim 5,
In the VOC adsorption honeycomb rotor, a perforating element is arranged in a cartridge type, and the perforating element is detachable and exchangeable.

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