JP4914748B2 - Thermal storage deodorizer - Google Patents

Description

  The present invention mainly relates to a heat storage type deodorizing apparatus for deodorizing a gas to be treated discharged from a factory or the like, and more particularly, a gas to be treated containing an organic substance such as a volatile organic compound (hereinafter referred to as “VOC”). The present invention relates to a heat storage deodorizing apparatus suitable for deodorization.

  2. Description of the Related Art Conventionally, as a deodorizing apparatus for a gas to be processed that is discharged from a factory or the like and contains VOC, a heat storage type deodorizing apparatus disclosed in, for example, Patent Document 1 below is known. That is, the conventional heat storage deodorization apparatus is generally configured to include a combustion region for burning the gas to be processed and a plurality of heat storage regions for preheating the gas to be processed to be introduced into the combustion region. In the heat storage region, for example, a honeycomb-shaped heat storage material is accommodated as a heat storage material, and on the other hand, in the combustion region, a heating device for raising the gas to be treated in the combustion region to a predetermined temperature (For example, a burner) is provided.

The heat storage deodorization apparatus is operated so that the gas to be treated passes through any one heat storage region and is introduced into the combustion region, heat-treated in the combustion region, and then discharged from the other heat storage region as an outlet. Is. The heat storage material accommodated in the heat storage area serving as the outlet gradually increases in temperature when the operation is continued for a while, so the heat storage area serving as the inlet and the heat storage area serving as the outlet are sequentially switched every predetermined time, and the heat storage material becomes high temperature. It operates so that to-be-processed gas may be introduce | transduced from an area | region.
As described above, the heat storage deodorizing apparatus minimizes the amount of heat that is taken out by the treated gas after treatment, and effectively uses the heat for heating the treated gas before treatment. Is to do.

Japanese Patent Laid-Open No. 9-264521

  By the way, the gas to be treated by this type of heat storage deodorizer is exhausted from various facilities in a wide range of fields such as the chemical industry, the electronics / semiconductor industry, the pharmaceutical industry, etc. Depending on the facility, the oxygen concentration in the gas to be treated may decrease. However, when the gas to be treated with a reduced oxygen concentration is directly heat-treated in the heat storage deodorizer, the carbon monoxide concentration in the gas to be treated discharged from the heat storage deodorizer may increase.

Conventionally, a method of increasing the oxygen concentration by mixing outside air into the gas to be processed has been studied for cases where the oxygen concentration of the gas to be processed is lowered.
However, in such a method, in order to increase the oxygen concentration of the gas to be processed whose oxygen concentration has decreased, it is necessary to mix a large amount of outside air, and the gas flow rate supplied to the heat storage deodorizer is constant. However, there is a problem that the amount of gas supplied to the regenerative deodorizing apparatus is greatly increased when the amount of gas to be processed is significantly reduced or when the amount of gas to be processed is constant. In addition, when a fan for introducing outside air is used, there is a problem that extra equipment costs and operation costs are required for the fan.

  In view of the problems of the prior art, the present invention has an object of providing a heat storage type deodorizing apparatus suitable for processing a gas to be processed whose oxygen concentration varies, and discharges even if the oxygen concentration varies. Another object is to provide a regenerative deodorizing apparatus that can maintain the carbon monoxide concentration in the gas as low as possible.

  In order to solve the above problems, the present invention comprises a plurality of heat storage regions in which a heat storage material is accommodated, and a heat treatment region that communicates with the plurality of heat storage regions and heat-treats the gas to be processed. A heat storage type deodorizing device configured to introduce a gas to be treated into the heat treatment region via an oxygen concentration measuring means for measuring an oxygen concentration in the gas to be treated; and Temperature control means for controlling the temperature, and the temperature of the heat treatment region controlled by the temperature control means is controlled based on the oxygen concentration in the gas to be processed measured by the oxygen concentration measurement means. Provided is a heat storage deodorizing apparatus characterized by being configured.

Further, the heat storage deodorization apparatus according to the present invention is such that when the oxygen concentration is x (%) and the control temperature of the heat treatment region is T (° C.), these x (%) and T (° C.) Is the following relational expression (1)
When 0 ≦ x ≦ 5, T = 900 ± 50
When 5 ≦ x ≦ 15, T = −8x + 940 ± 50 (1)
When 15 ≦ x, T = 820 ± 50
It is controlled to satisfy.

  The regenerative deodorization apparatus according to the present invention further includes a gas flow rate control means for controlling the flow rate of the gas to be processed, and the flow rate is an oxygen concentration x (%) in the gas to be processed. It is configured to be controlled based on a change rate dx / dt (% / min).

  Furthermore, the regenerative deodorizing apparatus according to the present invention further comprises a carbon monoxide concentration measuring means for measuring a carbon monoxide concentration in the gas to be treated discharged from the regenerative deodorizing apparatus, and is controlled by the temperature control means. The temperature of the heat treatment region is controlled based on the carbon monoxide concentration in the gas to be treated measured by the carbon monoxide concentration measuring means.

  The regenerative deodorization apparatus according to the present invention is configured such that the temperature of the heat treatment region controlled by the temperature control unit is controlled based on the oxygen concentration in the gas to be processed measured by the oxygen concentration measurement unit. Therefore, when the oxygen concentration fluctuates, the temperature of the heat treatment region is controlled by the temperature control means based on the oxygen concentration. That is, the temperature of the heat treatment region is controlled to a temperature range suitable for the oxygen concentration based on the oxygen concentration of the gas to be processed, and an increase in the carbon monoxide concentration can be prevented.

  The present invention also includes a plurality of heat storage regions in which a heat storage material is accommodated, and a heat treatment region that communicates with the plurality of heat storage regions and heat-treats the gas to be processed. Is a heat storage type deodorization device configured to be introduced into the heat treatment region, and a carbon monoxide concentration measuring means for measuring a carbon monoxide concentration in a gas to be treated discharged from the heat storage type deodorization device, Temperature control means for controlling the temperature of the heat treatment area, and the temperature of the heat treatment area controlled by the temperature control means is one of the gases in the gas to be treated measured by the carbon monoxide concentration measurement means. Provided is a heat storage type deodorizing device configured to be controlled based on a carbon oxide concentration.

  In the regenerative deodorization apparatus according to the present invention, the temperature of the heat treatment region controlled by the temperature control means is based on the carbon monoxide concentration in the exhausted gas to be processed measured by the carbon monoxide concentration measuring means. Therefore, when the concentration of carbon monoxide in the discharged gas to be processed fluctuates due to the change in the oxygen concentration of the gas to be processed, the carbon monoxide Based on the concentration, the temperature of the heat treatment region is controlled by the temperature control means. That is, the temperature of the heat treatment region is controlled to a temperature range in which the carbon monoxide concentration is lowered based on the carbon monoxide concentration of the exhausted gas to be processed. The rise can be prevented.

  Thus, according to the present invention, a regenerative deodorizing apparatus suitable for processing a gas to be processed whose oxygen concentration varies is provided. In addition, even when the oxygen concentration in the gas to be treated fluctuates, it is possible to suppress the emission of carbon monoxide.

Hereinafter, it explains in detail, referring to drawings for one embodiment of a thermal storage type deodorization device concerning the present invention. FIG. 1 is a flowchart showing an embodiment of a heat storage deodorizing apparatus according to the present invention.
As shown in FIG. 1, the heat storage deodorization apparatus 1 of the present embodiment includes a heat treatment region 2 that heats the gas to be treated A and oxidatively decomposes organic substances such as VOC contained in the gas to be treated, It comprises three heat storage regions 3 in which a heat storage material 31 for transferring heat to and from the gas A to be processed heated by the heat treatment region 2 is housed, and is configured as a so-called three-column heat storage deodorization device. ing.

  The heat treatment region 2 is provided with a burner 21 as temperature adjusting means for adjusting the temperature in the heat treatment region 2 and a thermometer 22 for measuring the internal temperature of the heat treatment region 2. . The burner 21 and the thermometer 22 are electrically connected to the control device 4, and the control device 4 controls the burner 21 so that the temperature measured by the thermometer 22 becomes a predetermined value. It is configured to be able to.

  In addition, the heat storage deodorization apparatus 1 of the present embodiment is configured to supply the gas to be processed A to the heat storage region 3 from the facility (not shown) that is the discharge source of the gas to be processed A. An oxygen concentration meter 7 is installed as an oxygen concentration measuring means for measuring the oxygen concentration. The oxygen concentration meter 7 is also electrically connected to the control device 4, and the oxygen concentration value measured by the oxygen concentration meter 7 is sent to the control device 4 by an electric signal. .

When the oxygen concentration measured by the oxygen concentration meter 7 is x (%), the control device 4 determines that the temperature T (° C.) in the heat treatment region is expressed by the following relational expression (1)
When 0 ≦ x ≦ 5, T = 900 ± 50
When 5 ≦ x ≦ 15, T = −8x + 940 ± 50 (1)
When 15 ≦ x, T = 820 ± 50
The burner 21 can be controlled to satisfy the above condition.

  More specifically, the control device 4 calculates the control calculated from the oxygen concentration x (%) when the actual temperature of the heat treatment region 2 measured by the thermometer 22 is T1 (° C.). By comparing the temperature T (° C.) with the actual temperature T 1 (° C.), an output signal (for example, a burner opening signal) corresponding to the difference is output to the burner 21. Yes.

  FIG. 2 is a graph in which the relational expression (1) is expressed as the oxygen concentration x (%) on the horizontal axis and the temperature T (° C.) in the heat treatment region 2 on the vertical axis. That is, as shown in FIG. 2, according to the control device 4 of the present embodiment, when the oxygen concentration x (%) in the gas to be processed is 15 (%) or more, The temperature T (° C.) of the gas was controlled to be in the range of 770 to 870 (° C.), and the oxygen concentration x (%) in the gas to be treated was lowered to be in the range of 5 to 15 (%). In this case, the temperature T (° C.) in the heat treatment region 2 is controlled to be within the range of T = −8x + 940 ± 50, and the oxygen concentration x (%) in the gas to be treated is 5 (%) or less. In this case, the temperature T (° C.) in the heat treatment region 2 is controlled to be in the range of 850 to 950 (° C.).

Preferably, the control device 4 has the following relational expression (2):
When 0 ≦ x ≦ 5, T = 900 ± 10
When 5 ≦ x ≦ 15, T = −8x + 940 ± 10 (2)
When 15 ≦ x, T = 820 ± 10
The burner 21 can be controlled to satisfy the above condition. According to such a control device 4, when the oxygen concentration x (%) in the gas to be processed is 15 (%) or more, The temperature T (° C.) in the heat treatment region 2 is controlled to be in the range of 810 to 830 (° C.), and the oxygen concentration x (%) in the gas to be processed is reduced to 5 to 15 (%). When the temperature is within the range, the temperature T (° C.) in the heat treatment region 2 is controlled to be within the range of T = −8x + 940 ± 10, and the oxygen concentration x (%) in the gas to be treated is When it is 5 (%) or less, the temperature T (° C.) in the heat treatment region 2 is controlled to be within the range of 890 to 910 (° C.).

FIG. 3 shows an example of a change with time in the oxygen concentration of the gas to be processed and a control temperature T when the temperature in the heat treatment region 2 is controlled based on the relational expression as described above when the gas to be processed is processed. 5 is a graph showing a change with time in (° C.).
As shown in FIG. 3, when the oxygen concentration is kept at a constant value of 15 (%), the heat treatment region control temperature T is also controlled to keep a constant value of 820 (° C.), and the oxygen concentration is 15 ( %) To 5 (%), the control temperature T in the heat treatment region is also controlled to rise from 820 (° C.) to 900 (° C.) correspondingly. When the oxygen concentration is maintained at a constant value of 5 (%), the control temperature T in the heat treatment region is also controlled to maintain a constant value of 900 (° C.), and the oxygen concentration is changed from 5 (%) to 15 ( %), The control temperature T in the heat treatment region is also controlled so as to drop from 900 (° C.) to 820 (° C.).

  By controlling the temperature T (° C.) of the heat treatment region based on the oxygen concentration x (%) in the gas to be treated so as to satisfy the relational expression as described above, the regenerative deodorizing apparatus 1 according to the present embodiment can be used. The carbon monoxide concentration in the exhausted gas to be processed will be greatly reduced.

As shown in FIG. 1, the regenerative deodorization apparatus 1 according to this embodiment further includes a blower 8 as a gas flow rate control means for controlling the flow rate of the gas A to be processed. The blower 8 is also electrically connected to the control device 4, and the control device 4 is based on the change rate dx / dt (% / min) of the oxygen concentration x (%) in the gas to be processed. Thus, the flow rate V (m ³ / h) of the gas to be processed determined by the blower 8 can be controlled.

More specifically, by way of example, when the change rate of the oxygen concentration x (%) in the gas to be processed is smaller than a predetermined value a (% / min), that is, dx / dt ≦ a. In this case, the flow rate V is set to the rated flow rate V1 (m ³ / h) of the heat storage deodorizer, the change rate of the oxygen concentration x (%) exceeds the predetermined value a (% / min) and is equal to or lower than the predetermined value b. In other words, when a ≦ dx / dt ≦ b, the flow rate V is decreased from the rated flow rate V1 (m ³ / h), and the change rate of the oxygen concentration x (%) is predetermined. When the value b (% / min) is exceeded, that is, when b ≦ dx / dt, the control device 4 is configured so that the flow rate V is the lower limit value V2 (m ³ / h). ing.

Here, the values of the coefficients a, b, and V1 in the flow rate control are not particularly limited, and can be determined by the temperature followability of the heat treatment region, but normally, a is −1 (% / min). It is preferable to do. That is, when the change rate dx / dt (% / min) of the oxygen concentration x (%) becomes −1 or less, in other words, when the oxygen concentration x decreases by 1 (%) or more per minute. It is preferable to set the flow rate control as described above.
The lower limit value V2 is preferably 20 to 30% of the rated flow rate V1, and the value b is preferably 3.

According to the control device 4 having such a configuration, when the change rate dx / dt (% / min) of the oxygen concentration x (%) in the gas to be processed is −1 or less, that is, in 1 minute. When the oxygen concentration in the gas decreases by 1% or more, the flow rate V (m ³ / h) is controlled to decrease through the blower 8, and the residence time of the gas to be processed in the heat treatment region 2 is controlled. Can be lengthened.
Normally, when the oxygen concentration in the gas to be treated changes slowly, as described above, this is dealt with by the temperature control of the heat treatment region 2 based on the oxygen concentration. The increase in the carbon monoxide concentration can be prevented, but when the oxygen concentration changes rapidly as described above, the temperature of the heat treatment region 2 can be made to follow the equation (1). In such a case, the flow rate V (m ³ / h) is decreased through the blower 8 in this case, thereby increasing the concentration of carbon monoxide in the gas to be treated discharged from the heat storage deodorizer 1. Can be prevented.

  If it is difficult to change the flow rate V of the gas to be processed due to the circumstances of the facility that is the discharge source, an outside air introduction fan (not shown) is used in addition to or in place of the decrease in the flow rate V. Outside air may be temporarily introduced. Thereby, it becomes possible to suppress the change rate of oxygen concentration, and it becomes possible to prevent the increase in the concentration of carbon monoxide in the gas to be treated discharged from the heat storage deodorizing apparatus 1.

  In addition, as shown in FIG. 1, the heat storage deodorization apparatus according to the present invention measures the concentration of carbon monoxide in the gas to be processed discharged to the discharge side duct 6 that discharges the gas to be processed A from the heat storage region 3. The carbon monoxide concentration meter 9 is further provided, and the temperature in the heat treatment region 2 is further based on the value of the carbon monoxide concentration in the gas to be treated measured by the carbon monoxide oxygen concentration meter 9. It may be configured to be controlled.

  Specifically, when the carbon monoxide concentration in the exhausted gas to be processed is below a predetermined value, the temperature of the heat treatment region is set based on the oxygen concentration in the supplied gas to be processed as described above. When the carbon monoxide concentration exceeds a predetermined value, in addition to the control based on the oxygen concentration, or instead of the control based on the oxygen concentration, the control based on the carbon monoxide concentration is performed. The control device 4 can be configured to do so.

  According to the regenerative deodorization apparatus having such a configuration, even when the temperature control based on the oxygen concentration does not function sufficiently, or when the amount of carbon monoxide produced increases due to a factor other than the oxygen concentration, the heat treatment region Temperature control (for example, temperature rise) can be performed, and carbon monoxide emission can be more reliably suppressed.

  In addition, the regenerative deodorization apparatus according to the present invention is configured to control the temperature of the heat treatment region based on the value of the carbon monoxide concentration in the gas to be treated measured by the carbon monoxide concentration meter 9. May be.

  Specifically, when the carbon monoxide concentration in the exhausted gas to be processed is equal to or higher than a predetermined value, the temperature of the heat treatment region is increased, and when the carbon monoxide concentration becomes lower than the predetermined value. The controller 4 can be configured to control based on the carbon monoxide concentration alone, not based on the oxygen concentration in the gas to be treated, so as to lower the temperature of the heat treatment region. .

  According to the heat storage type deodorizing apparatus having such a configuration, it is possible to cope with the treatment of a gas to be treated containing various VOC components, and any gas to be treated containing any VOC component can discharge carbon monoxide. It becomes possible to suppress it reliably.

  In the above-described embodiment, a three-column heat storage deodorizing apparatus has been described as an example. However, the present invention is not limited to this, and other types of heat storage such as a two-column type and a rotary type are used. It is also possible to use a type deodorizing device.

The flowchart which showed 1st embodiment of the thermal storage type deodorizing apparatus which concerns on this invention. The graph which showed the relationship between the oxygen concentration in to-be-processed gas, and the heat processing area | region control temperature corresponding to it. The graph which showed an example of the time-dependent change of oxygen concentration x (%) in to-be-processed gas, and the time-dependent change of control temperature T (degreeC) of the heat processing area | region controlled corresponding to it.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thermal storage deodorizing apparatus 2 Heat processing area 3 Thermal storage area 4 Control apparatus 5 Supply side duct 6 Exhaust side duct 7 Oxygen concentration meter 8 Blower 9 Carbon monoxide concentration meter 21 Burner 22 Thermometer 31 Thermal storage material A Processed gas

Claims (6)

A plurality of heat storage regions containing the heat storage material and a heat treatment region that communicates with the plurality of heat storage regions and heat-treats the gas to be treated, and the gas to be treated is introduced into the heat treatment region via the heat storage region A regenerative deodorization device configured to be,
Oxygen concentration measuring means for measuring the oxygen concentration in the gas to be treated;
Temperature control means for controlling the temperature of the heat treatment region,
The regenerative deodorization is characterized in that the temperature of the heat treatment region controlled by the temperature control means is controlled based on the oxygen concentration in the gas to be processed measured by the oxygen concentration measuring means. apparatus. When the oxygen concentration is x (%) and the control temperature of the heat treatment region is T (° C.), these x (%) and T (° C.) are expressed by the following relational expression (1):
When 0 ≦ x ≦ 5, T = 900 ± 50
When 5 ≦ x ≦ 15, T = −8x + 940 ± 50 (1)
When 15 ≦ x, T = 820 ± 50
The regenerative deodorizing apparatus according to claim 1, wherein the regenerative deodorizing apparatus is controlled so as to satisfy.   A processing gas flow rate control means for controlling the flow rate of the processing gas is further provided, and the flow rate is based on a change rate dx / dt (% / min) of the oxygen concentration x (%) in the processing gas. The regenerative deodorizing apparatus according to claim 1, wherein the regenerative deodorizing apparatus is controlled.   When the rate of change dx / dt (% / min) of the oxygen concentration x (%) in the gas to be processed is −1 or less, control by the gas flow rate control means is performed so as to decrease the flow rate. The regenerative deodorizing apparatus according to claim 3, wherein the deodorizing apparatus is configured as described above.   Carbon monoxide concentration measuring means for measuring the concentration of carbon monoxide in the gas to be treated discharged from the heat storage deodorizing apparatus is further provided, and the temperature of the heat treatment region controlled by the temperature control means is the carbon monoxide. The regenerative deodorization apparatus according to any one of claims 1 to 4, wherein the regenerative deodorization apparatus is configured to be controlled based on a concentration of carbon monoxide in the gas to be treated measured by the concentration measuring means. A plurality of heat storage regions containing the heat storage material and a heat treatment region that communicates with the plurality of heat storage regions and heat-treats the gas to be treated, and the gas to be treated is introduced into the heat treatment region via the heat storage region A regenerative deodorization device configured to be,
Carbon monoxide concentration measuring means for measuring the concentration of carbon monoxide in the gas to be treated discharged from the heat storage deodorizer;
Temperature control means for controlling the temperature of the heat treatment region,
The temperature of the heat treatment region controlled by the temperature control means is configured to be controlled based on the carbon monoxide concentration in the gas to be processed measured by the carbon monoxide concentration measuring means. Thermal storage deodorizing device.

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