JP2006272187A - Exhaust-gas treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust-gas treatment apparatus which can automatically control a concentration of an exhaust-gas component of a treated gas by automatically controlling an adsorbing capacity of an activated carbon. <P>SOLUTION: The exhaust-gas treatment apparatus has an adsorbing tower 1 for making an activated carbon fluidize to adsorb a total hydrocarbon in an exhaust gas with the activated carbon, a desorbing tower 7 for imparting the determined desorbing temperature to an activated carbon 2 discharged from the adsorbing tower 1 to desorb the total adsorbed hydrocarbon, and a transporting apparatus 5, 6, 9, 10 for making the activated carbon circulate between the adsorbing tower 1 and the desorbing tower 7, wherein this apparatus is equipped with a measuring means 13, 14 for the concentration of the total hydrocarbon in the treated gas discharged from the adsorbing tower 1 and a controlling part 15 for automatically controlling the desorbing temperature from on a measuring result of the measuring means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an exhaust gas treatment apparatus that removes harmful components from exhaust gas.
As an exhaust gas treatment apparatus for removing harmful components from exhaust gases containing harmful components such as organic solvents, exhaust gas treatment apparatuses that adsorb harmful components with flowing activated carbon have been put into practical use. In such an exhaust gas treatment apparatus, it is necessary to maintain the adsorption ability of activated carbon and stabilize the removal performance of harmful components.

  FIG. 9 shows a conventional example of an activated carbon fluidized bed exhaust gas treatment apparatus. In the adsorption tower 1, a multi-stage fluidized bed 3 for causing the activated carbon 2 to flow from the upper side to the lower side is disposed, and an untreated gas discharged from a factory or the like is exhausted at the lower part of the adsorption tower 1. It is supplied via the supply fan 4. When the exhaust gas rises in the adsorption tower 1, harmful components such as all hydrocarbons are adsorbed and removed by the activated carbon, and the treated gas is discharged from the upper part of the adsorption tower 1.

  When the activated carbon 2 moving downward on the fluidized bed 3 in the adsorption tower 1 reaches the lower end of the adsorption tower 1, it is conveyed to the desorption tower 7 via the conveying devices 5 and 6. A heater 8 is provided in the desorption tower 7, and a desorption temperature (for example, 200 ° C.) based on the boiling point of all hydrocarbons adsorbed on the activated carbon 2 is supplied into the desorption tower 7.

In the desorption tower 7, all hydrocarbons are separated from the activated carbon 2, and the activated carbon 2 is supplied to the adsorption tower 1 again through the transfer devices 9 and 10.
All hydrocarbons released from the activated carbon 2 in the desorption tower 7 are sent to the condenser 11. The condenser 11 cools all hydrocarbons with cold water supplied from the outside and discharges them as a recovery solvent.

  In such an exhaust gas treatment apparatus, while the activated carbon 2 circulates between the adsorption tower 1 and the desorption tower 7 and repeatedly adsorbs and desorbs all hydrocarbons, the desorption tower 7 undergoes thermal alteration of all hydrocarbons. In the inside, even at the above desorption temperature, it becomes difficult for all the hydrocarbons to be detached from the activated carbon 2 and the adsorption capacity may be lowered.

  Therefore, a part of the activated carbon 2 is taken out from the transfer device 9 during operation, and the bulk density of the activated carbon 2 is measured using a graduated cylinder and a weight meter. When the bulk density rises above a predetermined value, the desorption tower 7 The desorption temperature is raised to about 400 ° C., and an operation for reducing the bulk density is performed.

  That is, the bulk density of the activated carbon 2 is 0.6 g / ml in a new state, but when the bulk density increases, the adsorption efficiency of all hydrocarbons decreases, so the bulk density rises to about 0.8 g / ml. The operator manually performs an operation of raising the desorption temperature to about 400 ° C. to lower the bulk density.

  Patent Document 1 discloses an exhaust gas treatment apparatus that measures the concentration of an exhaust gas component at the outlet of an adsorption tower and regenerates the adsorption capacity of activated carbon by plasma discharge when the concentration reaches a predetermined value or more.

Further, Patent Document 2 discloses an exhaust gas treatment device that adjusts the circulation amount of activated carbon according to the concentration of exhaust gas supplied to the adsorption device.
Further, in Patent Document 3, two adsorption units are provided in parallel, and the adsorption amount is calculated by measuring the exhaust gas concentration of the untreated gas, and the adsorption unit performs the adsorption process according to the adsorption amount, and the regeneration process. An exhaust gas treatment device that alternately switches the other adsorption unit that performs the above is disclosed.

Patent Document 4 discloses a configuration similar to that of the exhaust gas treatment apparatus shown in FIG.
JP 2004-8828 A JP 2001-276562 A JP 2003-170022 A JP 7-185252 A

In recent years, regulations relating to air pollution have become stricter, and it is necessary to manage so that the concentration of total hydrocarbons contained in the treated gas released into the atmosphere is below a predetermined value.
However, in the exhaust gas treatment apparatus shown in FIG. 9, the adsorption efficiency in the adsorption tower 1 is maintained by managing the bulk density of the activated carbon 2 discharged from the desorption tower 7. It does not control the concentration of harmful components in the treated gas. Moreover, since the measurement of the bulk density and the management of the desorption temperature of the desorption tower are performed manually by the operator, there is a problem that the total hydrocarbon concentration in the treated gas cannot be managed.

In patent document 1, although the density | concentration of the exhaust gas component of the exit of an adsorption tower is measured, the structure which performs the measurement operation | movement and the reproduction | regeneration process of activated carbon automatically is not disclosed.
Patent Documents 2, 3, and 4 do not disclose the idea of managing the concentration of exhaust gas components discharged from the adsorption device.

  An object of the present invention is to provide an exhaust gas treatment apparatus capable of automatically managing the concentration of exhaust gas components of treated gas by automatically managing the adsorption capacity of activated carbon.

  An object of the present invention is to provide an exhaust gas treatment comprising a measuring means for measuring the total hydrocarbon concentration of the treated gas discharged from the adsorption tower, and a controller for automatically controlling the desorption temperature based on the measurement result of the measuring means. Achieved by the device.

  In addition, the above object is an activated carbon bulk density automatic measuring device that automatically measures the bulk density of activated carbon discharged from the desorption tower, and a control that automatically controls the desorption temperature based on the measurement result of the activated carbon bulk density automatic measuring device. This is achieved by an exhaust gas treatment device including a section.

  Further, the object is to cool a total hydrocarbon released in the desorption tower and discharge it as a recovery solvent, a recovery solvent flow meter for measuring the flow rate of the recovery solvent discharged from the condenser, and the recovery solvent flow rate. This is achieved by an exhaust gas treatment apparatus including a control unit that automatically controls the desorption temperature based on the measurement result of the meter.

  ADVANTAGE OF THE INVENTION According to this invention, the waste gas processing apparatus which can manage automatically the density | concentration of the waste gas component of processed gas can be provided by managing automatically the adsorption capacity of activated carbon.

(First embodiment)
FIG. 1 shows a first embodiment of an activated carbon fluidized bed exhaust gas treatment apparatus embodying the present invention. The same components as those in the conventional example will be described with the same reference numerals.

  In the adsorption tower 1, a multi-stage fluidized bed 3 for causing the activated carbon 2 to flow from the upper side to the lower side is disposed, and an untreated gas discharged from a factory or the like is exhausted at the lower part of the adsorption tower 1. It is supplied via the supply fan 4. In addition, when the outside air is supplied to the supply fan 4 and the supply pressure of the untreated gas is low, the outside air is mixed into the untreated gas and supplied to the adsorption tower 1 as a predetermined supply pressure.

  When the activated carbon 2 moving downward on the fluidized bed 3 in the adsorption tower 1 reaches the lower end of the adsorption tower 1, it is conveyed to the desorption tower 7 via the conveying devices 5 and 6. A heater 8 is provided in the desorption tower 7, and a desorption temperature (for example, 200 ° C.) based on the boiling point of the exhaust gas component adsorbed on the activated carbon 2 is supplied into the desorption tower 7.

In the desorption tower 7, the exhaust gas component is separated from the activated carbon 2, and the activated carbon 2 is supplied to the adsorption tower 1 again through the transfer devices 9 and 10.
The activated carbon 2 in the transfer devices 5 and 9 is transferred to the transfer devices 6 and 10 based on the transfer airflow supplied from the transfer blower 12.

  The exhaust gas component released from the activated carbon 2 in the desorption tower 7 is sent to the condenser 11. The condenser 11 cools the exhaust gas component with cold water supplied from the outside and discharges it as a recovery solvent.

  A part of the exhaust gas is also supplied to the concentration meter 13, and a part of the processed gas discharged from the adsorption tower 1 is supplied to the concentration meter 13. The concentration meter 13 measures the total hydrocarbon concentration of the exhaust gas and the treated gas, and outputs the measurement result to the calculation unit 14.

  The calculation unit 14 calculates the total hydrocarbon concentration removal rate based on the measured value of the total hydrocarbon concentration of the exhaust gas and the treated gas, and outputs the calculation result to the control unit 15. The control unit 15 controls the operation of the heater 8 based on the calculation result output from the calculation unit 14 to control the desorption temperature of the desorption tower 7 as shown in FIG. That is, when raising the total hydrocarbon concentration removal rate, the output Wh of the heater 8 is raised within a predetermined range.

  FIG. 7 shows the operation of the control unit 15. In the control unit 15, the total hydrocarbon concentration removal rate is set in advance as the set value A (step 1). This set value A is 80% here.

  Next, the control unit 15 takes in the comparison value B, which is the current removal rate, from the calculation unit 14 (step 2) and compares it with the set value A (step 3). When A> B is not satisfied, that is, when the comparison value B is 80% or more, the comparison operations in steps 2 and 3 are repeated.

  In step 3, when A> B, that is, when the comparison value B is less than 80%, the control unit 15 raises the output of the heater 8 and raises the desorption temperature of the desorption tower 7 (step 4). Then, the comparison value B is captured again (step 5) and compared with the set value A (step 6).

  When A> B, that is, when the comparison value B has not yet reached 80%, steps 4 to 6 are repeated. When A> B is not satisfied, that is, when the comparison value B exceeds 80%, the output of the heater 8 is lowered to lower the desorption temperature (step 7), and the process proceeds to step 2.

  FIGS. 8A and 8B show an example of the temperature adjustment operation in step 4. As shown in FIG. 5A, when the desorption temperature is increased, the desorption temperature is increased by 50 ° C. in 12 hours, and the same temperature is maintained for 12 hours thereafter, with 400 ° C. being the upper limit.

  By the operation as described above, the total hydrocarbon concentration of the exhaust gas and the treated gas is measured by the densitometer 13, and the total hydrocarbon concentration removal rate is calculated by the calculation unit 14 based on the concentration. When the total hydrocarbon concentration removal rate falls below 80%, the controller 15 raises the desorption temperature in the desorption tower 7 and regenerates the adsorption capacity of the activated carbon 2.

If the total hydrocarbon concentration removal rate is 80% or more, the desorption temperature in the desorption tower 7 is lowered to the usual 200 ° C.
In the exhaust gas treatment apparatus as described above, the following operational effects can be obtained.
(1) The total hydrocarbon concentration removal rate is constantly monitored, and if the total hydrocarbon concentration removal rate falls below 80%, the desorption temperature can be immediately raised to regenerate the adsorption capacity of the activated carbon 2. Therefore, the total hydrocarbon concentration removal rate can be stably maintained at 80% or more.
(2) It is possible to automatically measure the total hydrocarbon concentration removal rate and control the desorption temperature. Therefore, since measurement by the operator and control of the desorption temperature are not required, the total hydrocarbon concentration removal rate can be stably maintained within a predetermined range.
(Second embodiment)
3 and 4 show a second embodiment. In this embodiment, an activated carbon bulk density automatic measuring device 16 and a control unit 17 are provided in place of the densitometer 13, the calculation unit 14 and the control unit 15 of the first embodiment. Other configurations are the same as those of the first embodiment.

  The activated carbon bulk density automatic measuring device 16 includes an outer container 18, an inner container 19, and a load cell 20, and the activated carbon 2 discharged from the desorption tower 7 is stored in the inner container 19. Then, the activated carbon 2 overflowed from the inner container 19 is discharged to the transfer device 9 through the overflow pipe 21.

  In the load cell 20, the weight of the activated carbon 2 stored in the inner container 19 is measured. In the activated carbon bulk density automatic measuring device 16, the bulk density is calculated based on the volume of the inner container 19 and the measured weight, and the bulk density is output to the control unit 17. The controller 17 controls the heater 8 according to the input bulk density.

  The inner container 19 is connected to the transfer device 9 via a discharge pipe 22, and an opening / closing valve 23 controlled by the control unit 17 is interposed in the discharge pipe 22. The on-off valve 23 is opened at regular intervals, and the activated carbon 2 in the inner container 19 is discharged to the transport device 9. Therefore, the activated carbon 2 in the inner container 19 is replaced at regular intervals.

  The control unit 15 controls the desorption temperature of the desorption tower 7 by controlling the operation of the heater 8 based on the input bulk density, as shown in FIG. That is, when the bulk density exceeds a predetermined value, the output of the heater 8 is increased to increase the desorption temperature of the desorption tower 7.

  The operation of the control unit 17 is the operation shown in FIG. 7 in which the determinations in steps 3 and 6 are A <B, the set value A is a preset bulk density (for example, 0.8 g / ml), and the comparison is made. The value B is the bulk density input from the activated carbon bulk density automatic measuring device 16. Then, the temperature adjustment operation in steps 4 and 7 is the operation shown in FIGS.

  By the operation as described above, the bulk density of the activated carbon 2 in the inner container 19 is calculated by the activated carbon bulk density measuring instrument 16, and when the bulk density exceeds a predetermined value, the desorption temperature in the desorption tower 7 is controlled by the control unit 17. Is raised, and the adsorption capacity of the activated carbon 2 is regenerated.

If the bulk density is equal to or lower than the predetermined value, the desorption temperature in the desorption tower 7 is lowered to the usual 200 ° C.
In the exhaust gas treatment apparatus as described above, the following operational effects can be obtained.
(1) When the bulk density of the activated carbon 2 is constantly monitored and the bulk density exceeds, for example, 0.8 g / ml, the desorption temperature can be immediately raised to regenerate the adsorption capacity of the activated carbon 2. Therefore, the bulk density can be stably maintained at 0.8 g / ml or less.
(2) The measurement of the bulk density and the control of the desorption temperature can be performed automatically. Therefore, it is not necessary to measure the bulk density and control the desorption temperature by the operator, so that the bulk density can be stably maintained within a predetermined range.
(3) Since the bulk density can be stably maintained within a predetermined range, the total hydrocarbon concentration of the treated gas can be stably maintained below a predetermined value.
(Third embodiment)
5 and 6 show a third embodiment. This embodiment includes a recovered solvent flow meter 24 and a control unit 25 in place of the concentration meter 13, the calculation unit 14, and the control unit 15 of the first embodiment. Other configurations are the same as those of the first embodiment.

  The recovered solvent flow meter 24 measures the flow rate of the recovered solvent discharged from the condenser 11 and outputs the measured value to the control unit 25. The control unit 25 controls the desorption temperature of the desorption tower 7 by controlling the operation of the heater 8 based on the measured value. That is, when the flow rate of the recovered solvent becomes equal to or less than a predetermined value, the output of the heater 8 is raised to raise the desorption temperature of the desorption tower 7.

  The operation of the control unit 17 is the operation shown in FIG. That is, the set value A is a flow rate set in advance, and the comparison value B is a flow rate value measured by the recovered solvent flow meter 24. Then, the temperature adjustment operation in steps 4 and 7 is the operation shown in FIGS.

  With the configuration as described above, the flow rate measured by the recovered solvent flow meter 24 and the preset flow rate are compared by the control unit 25. When the measured flow rate falls below a predetermined value, the desorption temperature in the desorption tower 7 is raised, and the adsorption capacity of the activated carbon 2 is regenerated. If the flow rate is equal to or higher than a predetermined value, the desorption temperature in the desorption tower 7 is lowered to the normal 200 ° C.

  In such an operation, since the supply amount of exhaust gas supplied to the adsorption tower 1 and the total hydrocarbon concentration are substantially constant, a decrease in the flow rate of the recovered solvent causes a decrease in adsorption capacity due to an increase in the bulk density of the activated carbon 2. Because it is estimated that

In the exhaust gas treatment apparatus as described above, the following operational effects can be obtained.
(1) The flow rate of the recovered solvent discharged from the condenser 11 is constantly monitored, and if the flow rate falls below a predetermined value, the desorption temperature can be immediately raised to regenerate the adsorption capacity of the activated carbon 2. Therefore, the total hydrocarbon concentration of the treated gas can be stably maintained below a predetermined value.
(2) It is possible to automatically measure the flow rate of the recovered solvent and control the desorption temperature. Accordingly, since measurement by the operator and control of the desorption temperature are not required, the bulk density can be stably maintained within a predetermined range.
(3) Since the bulk density can be stably maintained within a predetermined range, the total hydrocarbon concentration of the treated gas can be stably maintained below a predetermined value.

The above embodiment may be modified as follows.
Management of desorption temperature based on detection of the total hydrocarbon concentration removal rate of the first embodiment, management of desorption temperature by detection of bulk density of the second embodiment, and recovery of the third embodiment It is also possible to implement any combination of management of the desorption temperature by detecting the flow rate of the solvent.
In the first embodiment, the desorption temperature may be controlled based on the total hydrocarbon concentration of the treated gas.
(Appendix 1)
An adsorption tower that causes activated carbon to flow and adsorbs all hydrocarbons in the exhaust gas with activated carbon;
Supplying a predetermined desorption temperature to the activated carbon discharged from the adsorption tower to desorb all adsorbed hydrocarbons;
An exhaust gas treatment apparatus comprising a transfer device for circulating the activated carbon between the adsorption tower and the desorption tower,
Measuring means for measuring the total hydrocarbon concentration of the treated gas discharged from the adsorption tower;
An exhaust gas treatment apparatus comprising: a control unit that automatically controls the desorption temperature based on a measurement result of the measurement means. (1)
(Appendix 2)
The measuring means includes
A densitometer for measuring the total hydrocarbon concentration of the treated gas and exhaust gas;
Based on the measured value of the densitometer, a calculation unit that calculates the total hydrocarbon concentration removal rate;
The exhaust gas processing apparatus according to claim 1, further comprising a control unit that automatically controls the desorption temperature based on the total hydrocarbon concentration removal rate calculated by the calculation unit. (2)
(Appendix 3)
An adsorption tower that causes activated carbon to flow and adsorbs all hydrocarbons in the exhaust gas with activated carbon;
Supplying a predetermined desorption temperature to the activated carbon discharged from the adsorption tower to desorb all adsorbed hydrocarbons;
An exhaust gas treatment apparatus comprising a transfer device for circulating the activated carbon between the adsorption tower and the desorption tower,
An activated carbon bulk density automatic measuring device for automatically measuring the bulk density of the activated carbon discharged from the desorption tower;
An exhaust gas treatment apparatus comprising: a control unit that automatically controls the desorption temperature based on a measurement result of the activated carbon bulk density automatic measuring instrument. (3)
(Appendix 4)
An adsorption tower that causes activated carbon to flow and adsorbs all hydrocarbons in the exhaust gas with activated carbon;
Supplying a predetermined desorption temperature to the activated carbon discharged from the adsorption tower to desorb all adsorbed hydrocarbons;
An exhaust gas treatment apparatus comprising a transfer device for circulating the activated carbon between the adsorption tower and the desorption tower,
A condenser that cools and discharges all hydrocarbons released in the desorption tower as a recovery solvent;
A recovered solvent flow meter for measuring the flow rate of the recovered solvent discharged from the condenser;
An exhaust gas treatment apparatus comprising: a control unit that automatically controls the desorption temperature based on a measurement result of the recovered solvent flow meter. (4)
(Appendix 5)
An exhaust gas treatment apparatus comprising the control unit according to claim 1. (5)
(Appendix 6)
An adsorption tower that causes activated carbon to flow and adsorbs all hydrocarbons in the exhaust gas with activated carbon;
Supplying a predetermined desorption temperature to the activated carbon discharged from the adsorption tower to desorb all adsorbed hydrocarbons;
An exhaust gas treatment apparatus comprising a transfer device for circulating the activated carbon between the adsorption tower and the desorption tower,
A densitometer for measuring the total hydrocarbon concentration of the treated gas and exhaust gas;
Based on the measured value of the densitometer, a calculation unit that calculates the total hydrocarbon concentration removal rate;
An activated carbon bulk density automatic measuring device for automatically measuring the bulk density of the activated carbon discharged from the desorption tower;
An exhaust gas treatment apparatus comprising: a control unit that automatically controls the desorption temperature based on a measurement result of the activated carbon bulk density automatic measuring instrument and a total hydrocarbon concentration removal rate calculated by the calculation unit.
(Appendix 7)
An adsorption tower that causes activated carbon to flow and adsorbs all hydrocarbons in the exhaust gas with activated carbon;
Supplying a predetermined desorption temperature to the activated carbon discharged from the adsorption tower to desorb all adsorbed hydrocarbons;
An exhaust gas treatment apparatus comprising a transfer device for circulating the activated carbon between the adsorption tower and the desorption tower,
A densitometer for measuring the total hydrocarbon concentration of the treated gas and exhaust gas;
Based on the measured value of the densitometer, a calculation unit that calculates the total hydrocarbon concentration removal rate;
A condenser that cools and discharges all hydrocarbons released in the desorption tower as a recovery solvent;
A recovered solvent flow meter for measuring the flow rate of the recovered solvent discharged from the condenser;
An exhaust gas treatment apparatus comprising: a control unit that automatically controls the desorption temperature based on a total hydrocarbon concentration removal rate calculated by the arithmetic unit and a measurement result of the recovered solvent flow meter.
(Appendix 8)
An adsorption tower that causes activated carbon to flow and adsorbs all hydrocarbons in the exhaust gas with activated carbon;
Supplying a predetermined desorption temperature to the activated carbon discharged from the adsorption tower to desorb all adsorbed hydrocarbons;
An exhaust gas treatment apparatus comprising a transfer device for circulating the activated carbon between the adsorption tower and the desorption tower,
An activated carbon bulk density automatic measuring device for automatically measuring the bulk density of the activated carbon discharged from the desorption tower;
A condenser that cools and discharges all hydrocarbons released in the desorption tower as a recovery solvent;
A recovered solvent flow meter for measuring the flow rate of the recovered solvent discharged from the condenser;
An exhaust gas treatment apparatus comprising: a control unit that automatically controls the desorption temperature based on a measurement result of the activated carbon bulk density automatic measuring instrument and a measurement result of the recovered solvent flow meter.
(Appendix 9)
An adsorption tower that causes activated carbon to flow and adsorbs all hydrocarbons in the exhaust gas with activated carbon;
Supplying a predetermined desorption temperature to the activated carbon discharged from the adsorption tower to desorb all adsorbed hydrocarbons;
An exhaust gas treatment apparatus comprising a transfer device for circulating the activated carbon between the adsorption tower and the desorption tower,
A densitometer for measuring the total hydrocarbon concentration of the treated gas and exhaust gas;
Based on the measured value of the densitometer, a calculation unit that calculates the total hydrocarbon concentration removal rate;
An activated carbon bulk density automatic measuring device for automatically measuring the bulk density of the activated carbon discharged from the desorption tower;
A condenser that cools and discharges all hydrocarbons released in the desorption tower as a recovery solvent;
A recovered solvent flow meter for measuring the flow rate of the recovered solvent discharged from the condenser;
A control unit that automatically controls the desorption temperature based on the measurement result of the activated carbon bulk density automatic measuring instrument, the total hydrocarbon concentration removal rate calculated by the calculation unit, and the measurement result of the recovered solvent flow meter. An exhaust gas treatment apparatus comprising:

It is a schematic diagram showing an exhaust gas treatment device of a first embodiment. It is explanatory drawing which shows operation | movement of the control part of 1st embodiment. It is a schematic diagram which shows the exhaust gas processing apparatus of 2nd embodiment. It is explanatory drawing which shows operation | movement of the control part of 2nd embodiment. It is a schematic diagram which shows the waste gas processing apparatus of 3rd embodiment. It is explanatory drawing which shows operation | movement of the control part of 3rd embodiment. It is a flowchart which shows operation | movement of the control part of 1st-3rd embodiment. (A) (b) is explanatory drawing which shows the management operation | movement of the desorption temperature of 1st-3rd embodiment. It is a schematic diagram which shows the conventional waste gas processing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Adsorption tower 2 Activated carbon 5, 6, 9, 10 Conveyance device 11 Condenser 13 Measuring means (concentration meter)
14 Measuring means (calculation unit)
15, 17, 25 Control unit 16 Activated carbon bulk density automatic measuring device 24 Recovery solvent flow meter

Claims (5)

An adsorption tower that causes activated carbon to flow and adsorbs all hydrocarbons in the exhaust gas with activated carbon;
Supplying a predetermined desorption temperature to the activated carbon discharged from the adsorption tower to desorb all adsorbed hydrocarbons;
An exhaust gas treatment apparatus comprising a transfer device for circulating the activated carbon between the adsorption tower and the desorption tower,
Measuring means for measuring the total hydrocarbon concentration of the treated gas discharged from the adsorption tower;
An exhaust gas treatment apparatus comprising: a control unit that automatically controls the desorption temperature based on a measurement result of the measurement means. The measuring means includes
A densitometer for measuring the total hydrocarbon concentration of the treated gas and exhaust gas;
Based on the measured value of the densitometer, a calculation unit that calculates the total hydrocarbon concentration removal rate;
The exhaust gas processing apparatus according to claim 1, further comprising a control unit that automatically controls the desorption temperature based on the total hydrocarbon concentration removal rate calculated by the calculation unit. An adsorption tower that causes activated carbon to flow and adsorbs all hydrocarbons in the exhaust gas with activated carbon;
Supplying a predetermined desorption temperature to the activated carbon discharged from the adsorption tower to desorb all adsorbed hydrocarbons;
An exhaust gas treatment apparatus comprising a transfer device for circulating the activated carbon between the adsorption tower and the desorption tower,
An activated carbon bulk density automatic measuring device for automatically measuring the bulk density of the activated carbon discharged from the desorption tower;
An exhaust gas treatment apparatus comprising: a control unit that automatically controls the desorption temperature based on a measurement result of the activated carbon bulk density automatic measuring instrument. An adsorption tower that causes activated carbon to flow and adsorbs all hydrocarbons in the exhaust gas with activated carbon;
Supplying a predetermined desorption temperature to the activated carbon discharged from the adsorption tower to desorb all adsorbed hydrocarbons;
An exhaust gas treatment apparatus comprising a transfer device for circulating the activated carbon between the adsorption tower and the desorption tower,
A condenser that cools and discharges all hydrocarbons released in the desorption tower as a recovery solvent;
A recovered solvent flow meter for measuring the flow rate of the recovered solvent discharged from the condenser;
An exhaust gas treatment apparatus comprising: a control unit that automatically controls the desorption temperature based on a measurement result of the recovered solvent flow meter.   An exhaust gas treatment apparatus comprising the control unit according to claim 1.

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