JP5409279B2 - Method and system for monitoring air purifier - Google Patents

Description

  The present invention relates to a monitoring method and a monitoring system for an air purifier, and more particularly to a monitoring method and a monitoring system for an air purifier that performs heating regeneration of an adsorbent that adsorbs moisture.

  In an air purification apparatus that uses a plurality of adsorption cylinders filled with an adsorbent, such as a temperature swing (TSA) type or a pressure temperature swing (PTSA) type, and repeats adsorption of moisture and release of moisture by heating, the adsorbent Will deteriorate over time. Therefore, it is necessary to replace the adsorbent before the processing capacity for air purification by the air purification apparatus is reduced. It is economical to replace the adsorbent immediately before the purified air quality deteriorates. For this purpose, it is necessary to accurately know the replacement time of the adsorbent.

As a conventional method for diagnosing the deterioration state of the adsorbent, there are the following techniques.
a. Method of measuring dew point temperature of purified air, which is air after adsorption treatment, with a dew point meter b. A method in which air being purified is collected from a measurement port attached to the adsorption cylinder and measured with a dew point meter (see, for example, Patent Document 1).
c. A method of diagnosing deterioration based on a temperature change during regeneration of the adsorbent (see, for example, Patent Documents 2 and 3).
The method a measures the dew point temperature of purified air from the adsorption cylinder. In the method b, the temperature of the air (dew point temperature: −60 ° C. or higher) collected from the adsorption cylinder is measured to confirm the rise of the adsorption band formed in the adsorption cylinder, and the outlet air, that is, purified air. An alarm is output before the dew point temperature rises. When the dew point temperature is higher than −60 ° C., an inexpensive dew point meter can be used. The technique of Patent Document 2 in the above method c measures the temperature of the adsorbent during regeneration of the adsorbent, and diagnoses the deterioration of the adsorbent from the rising characteristics of the adsorbent temperature. That is, the adsorbent utilizes the characteristic that the temperature is lowered by desorption of moisture. Further, the technique of Patent Document 3 in the method c described above is such that when the adsorbent is regenerated, the exhaust temperature of the adsorbent is measured with a temperature sensor, and if the exhaust temperature exceeds the reference temperature within the reference time, Judged as deterioration.

JP 2007-319727 A JP-A-9-47630 JP 2004-188371 A

  However, the methods a to c have the following problems. In order to measure ultra low dew point air with a dew point temperature of −100 ° C. or less by the method a above, an expensive dew point meter of several million yen is required.

  According to the above method b, the air during the purification (dew point temperature −60 ° C. or higher) is measured to confirm the rise of the adsorption zone in the adsorption cylinder, and an alarm is given before the dew point temperature of the outlet air rises. Because it outputs, it can be measured with a dew point meter of several hundred thousand yen. As a result, the cost is low compared with the method a, but still expensive equipment is required. Also, in order to ensure the reliability of the dew point meter itself, regular maintenance of the dew point meter is necessary.

  In the method c, since the temperature change during regeneration of the adsorbent is measured by an inexpensive temperature sensor such as a thermocouple, the cost can be reduced. The technique of Patent Document 2 in the method c measures the temperature rise characteristic in the adsorption cylinder. Then, when the rate of change in temperature rises in advance, the adsorbent is diagnosed as having deteriorated. In this method, even when the amount of raw material air is excessive or when the load is high, such as when the dew point of raw material air is high, the regeneration temperature rise rate decreases. There is a risk of misidentification.

  The technique of Patent Document 3 in the above method c measures the temperature of the adsorbent exhaust temperature (regeneration outlet air), and determines that the adsorbent has deteriorated when the reference temperature is exceeded within the reference time. The fact that the exhaust gas temperature of the adsorbent rises above the reference temperature means that the heat of desorption has become smaller than usual, that is, the capacity of the equipment has declined. There is a risk that it has declined. In addition, when the load is small, such as when the amount of raw material air is small, the temperature may be higher than the reference temperature, and this method may mislead the deterioration of the adsorbent.

  An object of the present invention is to provide a monitoring method and a monitoring system for an air purifier that can solve the above-described problems and can accurately determine load fluctuations and deterioration of an adsorbent.

In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that the raw material air introduced from the inlet of a cylindrical body filled with an adsorbent that adsorbs moisture is purified by the adsorbent and the outlet of the cylindrical body. In the monitoring method of the air purification apparatus that regenerates the adsorbent by releasing the moisture adsorbed on the adsorbent by heated regenerated air, and introduced into the outlet of the cylindrical body during regeneration of the adsorbent The temperature of the regenerated air is measured by a first temperature sensor, the temperature inside the cylindrical body is measured by one or more second temperature sensors, and discharged from the inlet of the cylindrical body. A temperature difference between the temperatures measured by the first temperature sensor and the second temperature sensor when the temperature of the regeneration air is measured by a third temperature sensor and a first time elapses from the start of regeneration of the adsorbent. And the first reference temperature Based on the comparison result of the difference, it performs the deterioration diagnosis of the adsorbent, when the temperature difference of the temperature of the first temperature sensor and said second temperature sensor of measured respectively below the first reference temperature difference When the adsorbent is determined to be normal and the adsorbent is determined not to be normal by the deterioration diagnosis , the second temperature sensor has passed the second temperature from the start of regeneration of the adsorbent. And the temperature of the temperature measured by each of the first temperature sensor and the third temperature sensor based on the comparison result between the temperature difference between the temperatures measured by the third temperature sensor and the second reference temperature difference. If the difference is less than or equal to the second reference temperature difference, it is determined that the adsorbent has deteriorated, and the temperature difference between the temperatures measured by the first temperature sensor and the third temperature sensor is the second reference temperature. If the temperature difference is greater than It determines that the load of excessive, characterized in that.

In the invention of claim 2, the raw material air introduced from the inlet of the cylindrical body filled with the adsorbent that adsorbs moisture is purified by the adsorbent, led out from the outlet of the cylindrical body, and heated by the regenerated air. In the monitoring method of the air purification apparatus for regenerating the adsorbent by removing the moisture adsorbed on the adsorbent, the temperature of the regenerated air introduced into the outlet of the cylindrical body at the time of regeneration of the adsorbent is first. The temperature inside the cylindrical body is measured by one or more second temperature sensors, and the temperature of the regeneration air discharged from the inlet of the cylindrical body is measured at a third temperature. When a first time elapses from the start of regeneration of the adsorbent as measured by a sensor, based on the difference in temperature measured by the first temperature sensor and the second temperature sensor during regeneration of the new adsorbent. To set the first reference temperature difference. When the temperature difference measured in the first time is equal to or less than the first reference temperature difference, the adsorbent is determined to be normal, and when the adsorbent is determined to be not normal by the deterioration diagnosis, The time point at which regeneration of the adsorbent ends or before and after the end is set as the second time, and the difference between the temperatures measured by the first temperature sensor and the third temperature sensor during regeneration of the new adsorbent is determined. When the second reference temperature difference is set based on the temperature difference measured at the second time is equal to or less than the second reference temperature difference, it is determined that the adsorbent is deteriorated, and the second reference temperature difference is determined. When the temperature difference measured over time is larger than the second reference temperature difference, it is determined that the load amount of the adsorbent is excessive .

In the invention of claim 3, the raw material air introduced from the inlet of the cylindrical body filled with the adsorbent that adsorbs moisture is purified by the adsorbent, led out from the outlet of the cylindrical body, and heated by the regenerated air. In a monitoring system of an air purifier that regenerates the adsorbent by removing moisture adsorbed on the adsorbent, the temperature of the regenerative air installed at the outlet of the cylindrical body and introduced into the outlet of the cylindrical body A first temperature sensor for measuring the temperature, one or two or more second temperature sensors for measuring the temperature inside the cylindrical body, and installed at the inlet of the cylindrical body. A third temperature sensor for measuring the temperature of the regeneration air discharged from the inlet of the cylindrical body, and the first temperature sensor and the second temperature sensor when a first time has elapsed from the start of regeneration of the adsorbent. The temperature difference between the temperatures measured by Based on the comparison of the reference temperature difference of 1, the perform deterioration diagnosis of the adsorbent, the first temperature sensor and the temperature difference between the second temperature measured by the temperature sensor each of the first reference temperature If the difference is less than or equal to the difference, it is determined that the adsorbent is normal, and when it is determined by the deterioration diagnosis that the adsorbent is not normal, the second time elapses from the start of regeneration of the adsorbent. based on the temperature sensor and the third temperature sensor of the 1 comparison between the temperature difference and the second reference temperature difference of temperature were measured, the first temperature sensor and the third temperature sensor of the measurements, respectively When the temperature difference between the measured temperatures is less than or equal to the second reference temperature difference, it is determined that the adsorbent has deteriorated, and the temperature differences measured by the first temperature sensor and the third temperature sensor are From the second reference temperature difference If hearing is a monitoring system for air purification apparatus characterized by comprising, a deterioration diagnosis means determines that the excessive load.

  According to the first and third aspects of the invention, an expensive dew point meter is not required as compared with the conventional technique of measuring the dew point temperature of purified air using a dew point meter, thereby enabling cost reduction. . In addition, according to the present invention, since the deterioration of the adsorbent and the excessive load amount are determined in each temperature measurement including the temperature measurement inside the cylindrical body, there is no need for regular maintenance of the dew point meter, It is possible to accurately determine the deterioration of the adsorbent before the purified air deteriorates and to avoid unnecessary replacement of the adsorbent. Furthermore, according to the present invention, it is possible to accurately determine the deterioration and load fluctuation of the adsorbent by measuring the temperature.

  According to the invention of claim 2, since the first reference temperature difference and the second reference temperature difference are set using the new adsorbent, the reference temperature difference can be easily set.

1 is a schematic configuration diagram illustrating a monitoring system according to a first embodiment. It is explanatory drawing explaining a basic pressure temperature swing adsorption cycle. It is explanatory drawing explaining a basic pressure temperature swing adsorption cycle. It is a figure which shows the flow of the raw material air at the time of refinement | purification and reproduction | regeneration of an air refiner | purifier, and refined air. It is explanatory drawing explaining deterioration of adsorption agent. It is a figure which shows the mode of an adsorption cylinder when an adsorbent is new, FIG. 6 (a) is a figure which shows moisture adsorption amount distribution, FIG.6 (b) is a figure which shows the temperature change in a cylinder at the time of reproduction | regeneration. It is a figure which shows the mode of an adsorption | suction cylinder when adsorbent deteriorates, Fig.7 (a) is a figure which shows moisture adsorption amount distribution, FIG.7 (b) is a figure which shows the temperature change in a cylinder at the time of reproduction | regeneration. It is a figure which shows the mode of the adsorption cylinder at the time of high load, FIG. 8 (a) is a figure which shows moisture adsorption amount distribution, FIG.8 (b) is a figure which shows the temperature change in a cylinder at the time of reproduction | regeneration. It is a flowchart which shows an example of a deterioration diagnosis process. 6 is a diagram illustrating an example of an adsorption cylinder according to Embodiment 2. FIG. 12 is a flowchart illustrating an example of a deterioration diagnosis process according to the third embodiment.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiment, the present invention is applied to a system in which pipes, sensors and valves are arranged symmetrically for every two adsorption cylinders, and the adsorbent regeneration means and the monitoring means, and the supply source and the exhaust destination are shared. The monitoring method and monitoring system of the air purifier are applied.

(Embodiment 1)
A schematic configuration of a monitoring system according to the first embodiment is shown in FIG. The monitoring system 1 according to this embodiment includes two adsorption cylinders 10A and 10B, a piping system 20 including check valves U1 and U2 and electromagnetic valves V1 to V7, a heater 30, and temperature sensors 40A to 40F. And a control panel 50. The adsorption cylinders 10A and 10B function as an adsorption device and have the same configuration. Inside the cylindrical body 10A ₁ of the adsorption columns 10A, such as silica gels, zeolites, such as activated alumina, adsorbents used in air purification is filled.

  A piping system 20 including check valves U1 and U2 and electromagnetic valves V1 to V7 includes piping 21A, 21B, 24, 25A, 25B, merging pipes 22A to 22D, a purified air outlet pipe 23, and a raw material gas inlet pipe. 26 and a regeneration gas discharge pipe 27. Pipes 21A and 21B are connected to the upper portions of the adsorption cylinders 10A and 10B, and the pipes 21A and 21B are joined by the joining pipe 22A. A purified air outlet pipe 23 is connected to the junction pipe 22A. Further, a merging pipe 22B is connected between the pipes 21A and 21B. Further, a pipe 24 is connected between the purified air outlet pipe 23 and the junction pipe 22B.

  The junction pipe 22A is provided with check valves U1 and U2 with a connection portion with the purified air outlet pipe 23 interposed therebetween. The flow of the check valve U1 and U2 closes the flow path to the suction cylinder 10A facing the check valve U1 and closes the flow path to the suction cylinder 10B facing the check valve U2. Yes. Thereby, the gas flowing through the junction pipe 22A flows only to the purified air outlet pipe 23 side. Therefore, the merging pipe 22A is used in a purified air lead-out system.

  The piping 24 is provided with an electromagnetic valve V3 and a heater 30 respectively. Due to the action of the electromagnetic valve V3, part of the purified air flowing through the purified air outlet pipe 23 is branched, and the branched purified air is heated by the heater 30 and flows to the merging pipe 22B as regenerated air.

  The junction pipe 22B is provided with electromagnetic valves V1 and V2, respectively, with a connection portion with the pipe 24 interposed therebetween. Due to the action of the electromagnetic valves V1 and V2, the regenerated air from the pipe 24 flows into the adsorption cylinder 10A or the adsorption cylinder 10B.

  Pipes 25A and 25B are connected to the lower portions of the adsorption cylinders 10A and 10B, and the pipes 25A and 25B are joined by a joining pipe 22C. A source gas introduction pipe 26 is connected to the junction pipe 22C. The junction pipe 22C is provided with electromagnetic valves V4 and V5 with the connecting portion of the source gas introduction pipe 26 interposed therebetween. By the action of the electromagnetic valves V4 and V5, the raw material air that is the raw material gas from the raw material gas introduction pipe 26 flows into the adsorption cylinder 10A or the adsorption cylinder 10B.

  A junction pipe 22D is connected between the pipes 25A and 25B. The pipes 25A and 25B are joined by the joining pipe 22D. A regeneration gas discharge pipe 27 is connected to the junction pipe 22D, and electromagnetic valves V6 and V7 are respectively provided with a connection portion with the regeneration gas discharge pipe 27 interposed therebetween. Due to the action of the electromagnetic valves V6 and V7, the regenerated air discharged from the adsorption cylinders 10A and 10B and flowing through the junction pipe 22D is discharged out of the system through the regenerative gas discharge pipe 27.

The temperature sensors 40A to 40C are provided in the adsorption cylinder 10A and the pipes 21A and 25A, and the temperature sensors 40D to 40F are provided in the adsorption cylinder 10B and the pipes 21B and 25B. The temperature sensors 40D to 40F are the same as the temperature sensors 40A to 40C. The temperature sensor 40A is provided near the connecting portion between the adsorption cylinder 10A and the pipe 21A and on the pipe 21A side. The temperature sensor 40 </ b> A mainly measures the inlet temperature of the regenerated air flowing through the pipe 21 </ b> A from the electromagnetic valve V <b> 1 and sends a measurement signal to the control panel 50. Temperature sensor 40B is located in the cylindrical upper portion of the upper clogging cylinder 10A ₁ in the adsorption column 10A, the temperature sensing portion through the cylinder are provided so as to extend inside the cylinder. The temperature sensor 40 </ b> B measures the cylinder upper part temperature of the cylinder 10 </ b> A ₁ filled with the adsorbent, and sends a measurement signal to the control panel 50. The temperature sensor 40C is provided in the vicinity of the connecting portion between the adsorption cylinder 10A and the pipe 25A and on the pipe 25A side. The temperature sensor 40C mainly measures the temperature of the regeneration air discharged from the adsorption cylinder 10A, that is, the outlet temperature, and sends a measurement signal to the control panel 50.

  The control panel 50 controls the operation of the air purifier constituted by the adsorption cylinders 10A and 10B, the piping system 20, and the heater 30. That is, the control panel 50 controls the opening and closing of the electromagnetic valves V1 to V7 to perform the PTSA cycle shown in FIG. That is, the control panel 50 performs the first step (left figure in FIG. 2) of performing adsorption with the adsorption cylinder 10A and desorbing the moisture of the adsorption cylinder 10B, and performing adsorption with the adsorption cylinder 10B and desorption of the moisture in the adsorption cylinder 10A. The second step (right diagram in FIG. 2) is performed alternately. At this time, as shown in FIG. 3, when the raw material air is purified in the cylinder A process performed by the adsorption cylinder 10A, the cylinder B process performed by the adsorption cylinder 10B uses a part of the purified air. Regeneration by heating the adsorption cylinder 10B and cooling / standby after the regeneration is completed. Conversely, when the raw material air is purified in the cylinder B process, the adsorption cylinder 10A is regenerated, cooled, and standby in the cylinder A process.

  Thus, the control panel 50 repeats the purification and regeneration instructions of the adsorption cylinders 10A and 10B at regular intervals by switching the two adsorption cylinders 10A and 10B filled with the adsorbent.

The control panel 50 diagnoses the deterioration of the adsorbent filled in the cylinders 10A ₁ and 10B ₁ of the adsorption cylinders 10A and 10B based on the measurement signals from the temperature sensors 40A to 40F. For example, as shown in FIG. 4, when the first process is performed according to an instruction from the control panel 50, the temperature sensors 40 </ b> D to 40 </ b> F measure the temperatures at various points when the regeneration air flows. At this time, the temperatures measured by the temperature sensors 40D to 40F are T1, T2, and T3, respectively. In addition, it is temperature in each place at the time of refine | purifying raw material air, Comprising: The temperature which each temperature sensor 40A-40C measures is set to T4, T5, and T6. 2 and 4, the flow path between the raw air and purified air obtained by purifying the raw air is indicated by a thick solid line, and the flow path between the purified air used for regeneration of the adsorbent and the regenerated air is indicated by a broken line. Is shown. Moreover, since the deterioration diagnosis of the adsorbent using the temperature sensors 40A to 40C is the same as the deterioration diagnosis using the temperature sensors 40D to 40F, the adsorbent using the temperatures T1 to T3 of the adsorption cylinder 10B will be described below. Deterioration diagnosis will be described.

  Here, a basic method of deterioration diagnosis performed by the control panel 50 will be described. In the air purifier filled with the adsorbent, the adsorbent is filled in a larger amount than necessary from the viewpoint of safety, that is, in order to reliably purify the air. When the adsorbent is new, the upper portion of the adsorption cylinder 10B is a marginal part, so that the amount of water is always small. This is shown in FIG. It is generally known that the adsorbent deteriorates from the lower part of the adsorption cylinder 10B where moisture adsorption and desorption are frequently repeated, that is, from the lower cylinder part. When the adsorbent is deteriorated, the amount of moisture adsorbed is reduced as compared with a new article. In FIG. 5, the bulging portion to the right in the cylinder schematically shows the amount of contribution to the adsorption by the adsorbent. When the adsorbent is in a new state, as shown in the left diagram of FIG. 5, the amount of moisture adsorbed at the bottom of the cylinder is large. Therefore, at the top of the cylinder, the amount of moisture adsorption is small as shown in FIG. As shown in FIG. 6B, the desorption heat during regeneration is small, so the temperature (T2) rises quickly. Note that FIG. 6B and FIGS. 7B and 8B, which will be described later, show the detected value (temperature T2) of the temperature sensor 40E close to the inlet of the regeneration air in the cylinder, and the inlet temperature T1. The state with the temperature T3 of the exit is shown. Further, when the adsorbent at the lower part of the adsorption cylinder 10B deteriorates, as shown in the central view of FIG. 5 and the right figure of FIG. 5, the moisture adsorption amount at the lower part of the cylinder decreases. As shown in FIG. 7B, moisture is adsorbed to the upper part of the cylinder, and as shown in FIG. 7B, the temperature (T2) rises slower than when the adsorbent is new.

Therefore, the reference time t1 is set during heating during regeneration, and the temperature difference ΔT _{12 (the} regeneration air inlet temperature T1 at the reference time t1 and the cylinder top temperature T2 of the adsorption cylinder 10B when the adsorbent is new _{) New} product ₎ and a temperature difference ΔT _{12 (deterioration)} when the adsorbent is deteriorated. And comparing the two temperature differences,
ΔT _{12 (new)} <ΔT _{12 (deteriorated)}
Thus, from the increase in temperature difference during regeneration of the adsorbent, it is possible to determine an increase in the amount of moisture adsorbed at the insertion portion of the temperature sensor 40E that measures the temperature T2.

By the way, even if the adsorbent of the adsorption cylinder 10B is not deteriorated, when the use amount (load) of the purified air is increased at the use destination, when the amount of the raw material air is increased, or depending on the outside air condition, etc. Even at the time of high load such as when the dew point of the raw material air rises, as shown in FIG. 8A, moisture may be adsorbed to the insertion portion of the temperature sensor 40E. Also at this time, as shown in FIG.
ΔT _{12 (new)} <ΔT _{12 (deteriorated)}
It becomes. For this reason, under this temperature difference condition, it is difficult to determine whether the adsorbent in the adsorption cylinder 10B has deteriorated or whether the load is excessive.

Therefore, the inventor of the present application paid attention to the fact that the outlet temperature T3 of the regeneration air discharged from the adsorption cylinder 10B varies depending on the load amount when the heating for regenerating the adsorbent is completed (reference time t2). The heat of the regenerated air supplied to the adsorption cylinder 10B is used to receive heat loss from the adsorption cylinder 10B, heating of the adsorbent, and heat of desorption of moisture. If the heat dissipation loss from the adsorption cylinder 10B is constant, the outlet temperature at the completion of heating of the adsorbent when the moisture adsorption amount (load quantity) of the entire cylinder is the same regardless of the adsorbent state (new or deteriorated) because T3 is the same, the inlet temperature T1 and the temperature difference [Delta] T ₁₃ of the outlet temperature T3 of the adsorption column 10B when the adsorbent is new _(new), the temperature difference [Delta] T ₁₃ when the adsorbent has deteriorated _{( What is degradation?}
ΔT _{13 (new)} = ΔT _{13 (deteriorated)}
(See FIGS. 6 and 7). Here, when the moisture adsorption amount of the entire cylinder is the same, the total moisture amount adsorbed when the adsorbent is new is the same as the total moisture amount adsorbed when the adsorbent is deteriorated. is there. The outlet temperature of the adsorption cylinder 10B is affected by the amount of moisture adsorbed on the entire cylinder. For this reason, even if the state of the adsorbent is new or deteriorated, as long as the total water content is the same, the outlet temperature becomes the same regardless of the state of the adsorbent when heating is completed during regeneration. On the other hand, since the heat of desorption increases at the time of high load, the temperature difference ΔT _{13 (high load)} between the inlet temperature T1 at the time of high load and the outlet temperature T3 of the adsorption cylinder 10B is as follows:
ΔT _{13 (new)} <ΔT _{13 (high load)}
ΔT _{13 (deterioration)} <ΔT _{13 (high load)}
It becomes.

That is, if the reference temperature difference at the reference time t1 is ΔT _set1, and the reference temperature difference at the reference time t2 is ΔT _set2 ,
Reference time t1: ΔT ₁₂ ≦ ΔT _set1
(Condition 1), the adsorbent is in a normal state. Also,
Reference time t1: ΔT ₁₂ > ΔT _set1
Reference time t2: ΔT ₁₃ ≦ ΔT _set2
When both of these are satisfied (condition 2), the adsorbent is in a degraded state. further,
Reference time t1: ΔT ₁₂ > ΔT _set1
Reference time t2: ΔT ₁₃ > ΔT _set2
When both of these are satisfied (condition 3), a high load state is shown. The temperature differences ΔT _set1 and ΔT _set2 include, for example, values set based on accumulated data when the adsorbent is new and when it is deteriorated, and values immediately after the adsorbent replacement.

Based on the basic method described above, the control panel 50 diagnoses the deterioration of the adsorbent. For this purpose, the control panel 50 performs the deterioration diagnosis process shown in FIG. When the deterioration diagnosis process is started, the control panel 50 measures the elapsed time from the start of heating in regeneration of the adsorbent (step S1), and determines whether or not the elapsed time has reached 1 hour (step S2). In the present embodiment, the reference time t1 is set to 1 hour. When the elapsed time does not reach 1 hour in step S2, the control panel 50 returns the process to step S1. If it is determined in step S2 that the elapsed time has reached 1 hour, the control panel 50 assumes that the inlet temperature of the regeneration air is 250 ° C. from the temperatures T1 and T2 measured by the temperature sensors 40D and 40E, respectively. A difference ΔT ₁₂ between the inlet temperature and the upper temperature of the adsorption cylinder 10B is calculated (step S3).
ΔT ₁₂ > 50 ° C.
Is determined (step S4). That is, the control panel 50 determines whether or not the above condition 1 is satisfied in step S4. In the present embodiment, the reference temperature difference ΔT _set1 at the reference time t1 is set to 50 ° C.

When the temperature difference ΔT ₁₂ exceeds 50 ° C. in step S4, it is determined whether or not the elapsed time from the start of heating has reached 3 hours (step S5). In the present embodiment, the reference time t2 is set to 3 hours. If it is determined in step S5 that the heating time has not passed 3 hours, the control panel 50 waits until 3 hours have passed. When it is determined in step S5 that the heating time has reached 3 hours, the control panel 50 determines the difference ΔT ₁₃ between the inlet temperature and the outlet temperature of the regeneration air from the temperatures T1 and T3 measured by the temperature sensors 40D and 40F, respectively. Is calculated (step S6), and the temperature difference is
ΔT ₁₃ ≦ 100 ° C
It is determined whether or not (step S7). That is, in step S7, the control panel 50 determines whether either of the condition 2 and the condition 3 is satisfied. In the present embodiment, the reference temperature difference ΔT _set2 at the reference time t2 is set to 100 ° C.

In step S7
ΔT ₁₃ ≦ 100 ° C
If so, the condition 2 is satisfied, so the control panel 50 outputs an adsorbent deterioration alarm indicating the deterioration of the adsorbent to the alarm device 50A (step S8), and ends the deterioration diagnosis process. In step S7,
ΔT ₁₃ ≦ 100 ° C
Is not true, that is,
ΔT ₁₃ > 100 ° C.
If so, the condition 3 is satisfied, so the control panel 50 outputs a high load alarm indicating that the load is high to the alarm device 50A (step S9), and ends the deterioration diagnosis process.

On the other hand, in step S4,
ΔT ₁₂ > 50 ° C.
Is not true, that is,
ΔT ₁₂ ≦ 50 ° C
If so, the condition 1 is satisfied, so the control panel 50 outputs an adsorbent normal output indicating that the adsorbent is normal to the alarm device 50A (step S10), and ends the deterioration diagnosis process.

  The alarm device 50A notifies the person in charge of the adsorbent deterioration alarm, the high load alarm, and the adsorbent normality by lighting display or the like according to the output from the control panel 50.

  Next, the operation of the monitoring system for the air purifier according to this embodiment will be described. The control panel 50 controls the heater 30 and the electromagnetic valves V1 to V7 to control the operation of the air purifier. Thereby, the control panel 50 performs the first step of performing adsorption with the adsorption cylinder 10A and desorbing moisture from the adsorption cylinder 10B, and the second step of performing moisture desorption with respect to the adsorption cylinder 10A and performing adsorption with the adsorption cylinder 10B. And alternately.

  The control panel 50 also receives signals of the inlet temperature of the regeneration air, the upper temperature of the adsorption cylinder 10B, and the outlet temperature of the regeneration air measured by the temperature sensors 40A to 40F, and desorbs the moisture to regenerate the adsorbent. Deterioration diagnosis processing is performed on the suction cylinder, and the diagnosis result is output to the alarm device 50A. The alarm device 50A notifies the person in charge of the adsorbent deterioration alarm, the high load alarm, and the normal adsorbent according to the output from the control panel 50. Thereafter, the person in charge replaces the adsorbent by, for example, an adsorbent deterioration alarm. At this time, partial or complete replacement of the adsorbent is performed depending on the price of the adsorbent and the replacement frequency. In order to perform partial replacement of the adsorbent, there is a method of packaging a plurality of adsorbents.

  According to the present embodiment, an expensive dew point meter is not required as compared with the conventional technique in which the dew point temperature of purified air is measured using a dew point meter, thereby enabling a significant cost reduction. Further, according to the present embodiment, it is possible to accurately determine a high load due to a load change and a deterioration of the adsorbent. This makes it possible to avoid unnecessary replacement of the adsorbent.

(Embodiment 2)
In the present embodiment, a plurality of temperature sensors are used for the adsorption cylinders 10A and 10B of the first embodiment. Hereinafter, the adsorption cylinder 10B will be described as an example. In the present embodiment, components that are the same as or the same as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted. As shown in FIG. 10, instead of the temperature sensor 40E according to the first embodiment with respect to the adsorption column 10B, providing the n-number of the temperature sensor _40E 1 ～40E _n.

Control board 50 in the middle heating during reproduction (reference time t1), receives the temperature _T2 1 to T2 _n that the temperature sensor _40E 1 _{~40E n} was measured. Thereafter, the control panel 50 calculates a temperature difference between the temperature T1 of the temperature sensor 40D is measured in the middle heating during regeneration, as a temperature difference [Delta] T ₁₂ what temperature difference is the largest, the step S3 of the deterioration diagnosis processing Do.

According to the present embodiment, since the deterioration diagnosis process is performed with the temperature difference ΔT ₁₂ being the largest, the adsorbent replacement timing can be determined more accurately. Also, the position of the temperature sensor according to the greatest temperature difference [Delta] T _12, can be positioned with a suction zone.

(Embodiment 3)
In the first embodiment, the control panel 50 performs the deterioration diagnosis process based on the conditions 1 to 3, but in the present embodiment, the following conditions are used instead of the conditions 1 to 3. In the present embodiment, components that are the same as or the same as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted. In this embodiment, the temperature sensor 40E in the middle heating during reproduction (reference time t1) is measured, a cylindrical upper temperature T2 of the tubular body 10A _1, the temperature sensor 40F is a heating completion of playback (reference time t2) The deterioration and high load of the adsorbent are determined based on whether or not the measured outlet temperature T3 of the regeneration air discharged from the adsorption cylinder 10B has reached the reference temperature.

In other words, when the reference temperature at the upper part of the cylinder at the reference time t1 is T2 _set and the outlet temperature of the regeneration air at the reference time t2 is T3 _set ,
Reference time t1: T2> T2 _set
(Condition 11), the adsorbent is in a normal state. Also,
Reference time t1: T2 ≦ T2 _set
Reference time t2: T3 ≧ T3 _set
When both of these are satisfied (condition 12), the adsorbent is in a degraded state. further,
Reference time t1: T2 ≦ T2 _set
Reference time t2: T3 <T3 _set
When both of these are satisfied (condition 13), a high load state is shown. The temperature differences ΔT _set2 and ΔT _set3 include, for example, values set from accumulated data when the adsorbent is new and when it is deteriorated, values immediately after the adsorbent replacement, and the like.

Based on these conditions 11 to 13, the control panel 50 performs, for example, the following deterioration diagnosis process. When the deterioration diagnosis process shown in FIG. 11 is started, the control panel 50 measures the elapsed time from the start of heating during regeneration (step S21), and determines whether or not the elapsed time has reached 1 hour (reference time t1) (step S21). S22). When the elapsed time does not reach 1 hour in step S22, the control panel 50 returns the process to step S21. If it is determined in step S22 that the elapsed time has reached 1 hour, the control panel 50 determines that the temperature T2 measured by the temperature sensor 40E is
T2> 200 ° C
Is determined (step S23). In other words, the control panel 50 determines whether or not the above condition 11 is satisfied in step S23. In the present embodiment, the reference temperature T2 _set at the reference time t1 is _set to 200 ° C.

In step S23, the temperature T2 at the top of the cylinder is
T2 ≦ 200 ° C
If it is, it is determined whether or not the elapsed time from the start of heating has reached 3 hours (reference time t2) (step S24). If it is determined in step S24 that the heating time has not passed 3 hours, the control panel 50 waits until 3 hours have passed. When it is determined in step S24 that the heating time has reached 3 hours, the control panel 50 determines that the temperature T3 measured by the temperature sensor 40F is T3 ≧ 150 ° C.
Is determined (step S25). That is, in step S25, the control panel 50 determines whether either of the above conditions 12 and 13 is satisfied. In the present embodiment, the reference temperature T3 _set at the reference time t2 is _set to 150 ° C.

In step S25,
T3 ≧ 150 ° C
If so, the condition 12 is satisfied, so the control panel 50 outputs an adsorbent deterioration alarm indicating the deterioration of the adsorbent to the alarm device 50A (step S26), and ends the deterioration diagnosis process. In step S25,
T3 ≧ 150 ° C
Is not true, that is,
T3 <150 ° C
If so, the condition 13 is satisfied, so the control panel 50 outputs a high load alarm indicating that the load is high to the alarm device 50A (step S27), and ends the deterioration diagnosis process.

On the other hand, in step S23,
T2> 200 ° C
If so, the condition 11 is satisfied, so the control panel 50 outputs an adsorbent normal output indicating that the adsorbent is normal to the alarm device 50A (step S28), and ends the deterioration diagnosis process. .

  According to the present embodiment, it is possible to perform the deterioration diagnosis of the adsorbent by reducing the number of steps of the deterioration diagnosis process performed by the control panel 50 and reducing the burden on the control panel 50. Further, the temperature sensors 40A and 40D of the adsorption cylinders 10A and 10B can be omitted, and the configuration of the apparatus can be simplified.

  The present invention is not limited to the PTSA type or the TSA type, and even in a pressure swing (PSA) type dryer that performs adsorption under pressure, the adsorbent is heated and regenerated from the state in which the rated load is adsorbed to the adsorbent. This makes it possible to simultaneously perform regeneration and deterioration diagnosis of the adsorbent.

1 monitoring system 10A, 10B adsorption cylinder 10A ₁ cylinder (tubular body)
20 Piping system 21A, 21B, 24, 25A, 25B Piping 22A-22D Merge pipe 23 Purified air outlet pipe 26 Raw material gas inlet pipe 27 Regenerative gas exhaust pipe U1, U2 Check valve V1-V7 Electromagnetic valve 30 Heater 40A-40F Temperature sensor 50 Control panel (deterioration diagnostic means)
50A alarm device

Claims (3)

The raw material air introduced from the inlet of the cylindrical body filled with the adsorbent that adsorbs moisture was purified by the adsorbent, led out from the outlet of the cylindrical body, and adsorbed by the adsorbent by the heated regeneration air In the monitoring method of the air purification device for regenerating the adsorbent by removing moisture,
During regeneration of the adsorbent, the temperature of the regeneration air introduced into the outlet of the cylindrical body is measured by a first temperature sensor, and the temperature inside the cylindrical body is measured by one or more second temperature sensors. And measuring the temperature of the regeneration air discharged from the inlet of the cylindrical body by a third temperature sensor,
When a first time elapses from the start of regeneration of the adsorbent, based on a comparison result between the temperature difference measured by the first temperature sensor and the second temperature sensor and the first reference temperature difference, respectively. If the temperature difference between the temperatures measured by the first temperature sensor and the second temperature sensor is less than or equal to the first reference temperature difference, the adsorbent is normal. Judge that there is,
When it is determined by the deterioration diagnosis that the adsorbent is not normal, when the second time elapses from the start of regeneration of the adsorbent, the temperature measured by the first temperature sensor and the third temperature sensor respectively. Based on the comparison result between the temperature difference and the second reference temperature difference, when the temperature difference between the temperatures measured by the first temperature sensor and the third temperature sensor is equal to or less than the second reference temperature difference, the judges that the deterioration of the adsorbent, the first when the temperature sensor and the third temperature sensor of greater than a reference temperature difference temperature difference the second temperature measured respectively, determines that an excessive amount of load To
A method for monitoring an air purifier characterized by that. The raw material air introduced from the inlet of the cylindrical body filled with the adsorbent that adsorbs moisture was purified by the adsorbent, led out from the outlet of the cylindrical body, and adsorbed by the adsorbent by the heated regeneration air In the monitoring method of the air purification device for regenerating the adsorbent by removing moisture,
During regeneration of the adsorbent, the temperature of the regeneration air introduced into the outlet of the cylindrical body is measured by a first temperature sensor, and the temperature inside the cylindrical body is measured by one or more second temperature sensors. And measuring the temperature of the regeneration air discharged from the inlet of the cylindrical body by a third temperature sensor,
When the first time has elapsed from the start of regeneration of the adsorbent, the first temperature sensor is based on the difference between the temperatures measured by the first temperature sensor and the second temperature sensor during regeneration of the new adsorbent. When a reference temperature difference is set and the temperature difference measured at the first time is equal to or less than the first reference temperature difference, the adsorbent is determined to be normal,
When it is determined by the deterioration diagnosis that the adsorbent is not normal, the regeneration end point of the adsorbent or before and after the end is set as the second time, and the first temperature sensor is set when the new adsorbent is regenerated. And the third temperature sensor are used to set the second reference temperature difference based on the difference between the temperatures measured by the third temperature sensor, and the temperature difference measured at the second time is less than or equal to the second reference temperature difference. In the case, it is determined that the adsorbent is deteriorated, and when the temperature difference measured in the second time is larger than the second reference temperature difference, it is determined that the load amount of the adsorbent is excessive.
A method for monitoring an air purifier characterized by that. The raw material air introduced from the inlet of the cylindrical body filled with the adsorbent that adsorbs moisture was purified by the adsorbent, led out from the outlet of the cylindrical body, and adsorbed by the adsorbent by the heated regeneration air In a monitoring system of an air purification device that regenerates the adsorbent by removing moisture,
A first temperature sensor that is installed at the outlet of the cylindrical body and measures the temperature of the regeneration air introduced into the outlet of the cylindrical body;
1 or 2 or more 2nd temperature sensors which are installed in the said cylindrical body and measure the temperature inside the said cylindrical body,
A third temperature sensor that is installed at the inlet of the cylindrical body and measures the temperature of the regeneration air discharged from the inlet of the cylindrical body;
When a first time elapses from the start of regeneration of the adsorbent, based on a comparison result between the temperature difference measured by the first temperature sensor and the second temperature sensor and the first reference temperature difference, respectively. If the temperature difference between the temperatures measured by the first temperature sensor and the second temperature sensor is less than or equal to the first reference temperature difference, the adsorbent is normal. When it is determined that the adsorbent is not normal according to the deterioration diagnosis, when the second time has elapsed from the start of regeneration of the adsorbent, the first temperature sensor and the third temperature sensor are Based on the comparison result between the temperature difference of the measured temperatures and the second reference temperature difference, the temperature difference of the temperatures measured by the first temperature sensor and the third temperature sensor is the second reference temperature. in the case of the following, before Determines that the deterioration of the adsorbent, the case first temperature sensor and said third temperature is greater than the reference temperature difference temperature difference the second of the temperature sensor were measured of degradation determines that excessive load Diagnostic means;
An air purifier monitoring system comprising: