JP2014119132A - Dryer adapted for voc (volatile organic compound) exhaust - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a dryer adapted for an improved VOC (Volatile Organic Compound) exhaust capable of reducing running cost of an entire dryer by decreasing cost required for production of drying gas and cost required for deodorizing exhaust gas.SOLUTION: This invention relates to a dryer 1 constituted such that a temperature of surrounding gas G0 is increased to generate dry gas G2, the dry gas G2 is supplied to a dryer 2 to dry items to be dried, exhaust gas G3 discharged out of dryer 2 is deodorized by a deodorization device 4, further there is provided a heat exchanger 6 for heat exchanging between deodorized gas G5 discharged out of the deodorization device 4 and exhaust gas G3 discharged out of the dryer 2, and the exhaust gas G3 can be supplied to the deodorization device 4 as exhaust gas G4 of high temperature. In the dryer 1, the deodorization device 4 is provided with catalyst 46b and means for increasing temperature of the surrounding gas G0 to generate dry gas G2 is provided with a heat pump type hot air production device 5.

Description

  The present invention relates to a drying facility for VOC emission used for drying foods and coated products, and in particular, VOC emission capable of reducing the cost required for generating dry gas and the cost required for deodorizing exhaust gas. It concerns the drying equipment corresponding to.

For example, the surface of a can of a canned beverage or the like is coated with a logo mark, product information, or the like by using a paint, and surface treatment is performed. It is used.
This apparatus supplies the drying gas G2 ′ generated by raising the outside air G0 ′ to about 200 ° C. by the hot stove 3 ′ to the dryer 2 ′, and in the dryer 2 ′ It is configured to perform drying.
Further, the exhaust gas G3 ′ exhausted from the dryer 2 ′ contains VOC (volatile organic compounds) such as odor components volatilized from the paint or the like. For this reason, the drying equipment 1 ′ includes exhaust gas. A deodorizing device 4 ′ is provided for deodorizing G3 ′ by burning (detoxifying) VOC components such as odor components by burning G3 ′ at a high temperature of 750 ° C. or higher.
In the operation of the drying facility 1 ', a heat exchanger 6' is provided in the exhaust path of the deodorized gas G5 'discharged from the deodorizing device 4', and the deodorized gas G5 'is provided in the heat exchanger 6'. Attempts have been made to reduce the amount of fuel consumed by the deodorizing device 4 '(drying equipment 1') by taking the heat therein into the exhaust gas G3 '.
Incidentally, the drying equipment 1 'shown in FIG. 4 adopts a so-called one-pass flow form in which all exhaust gas G3' is exhausted to the outside, and the exhaust gas G3 'discharged from the dryer 2' The present invention is not limited to a coated product in which contact with an object to be dried is not preferable, but is used for drying processing of foods and the like.

Further, the drying facility 10 'shown in FIG. 5 omits the hot stove 3' in the drying facility 1 'shown in FIG. 4, and heats the exhaust passage of the low temperature deodorized gas G6' discharged from the heat exchanger 6 '. An exchanger 8 ′ is provided, and in this heat exchanger 8 ′, the heat in the low temperature deodorized gas G6 ′ is taken into the outside air G0 ′, thereby generating a dry gas G2 ′ of about 200 ° C. This is an attempt to reduce fuel consumption.
Incidentally, the drying equipment 10 ′ shown in FIG. 5 adopts a so-called one-pass flow configuration in which a part of the low temperature deodorized gas G 6 ′ is exchanged with the outside air G 0 ′ to form the drying gas G 2 ′. The exhaust gas G3 ′ exhausted from the dryer 2 ′ and the object to be dried do not have a problem in contact with the object to be dried, and are used for drying processing of foods and coated products.

In order to reduce the running cost of such a drying facility, the present applicant has devised a device configured to supply the outside air heated by the heat pump as a drying gas to the dryer, and has already filed a patent application. (See Patent Document 1).
However, the device described in Patent Document 1 is not configured to recover heat in the exhaust gas discharged from the deodorization device, and is not intended to reduce the cost required for deodorization of the exhaust gas. Therefore, there is room for further improvement from the viewpoint of energy saving of the entire drying facility.

JP2012-7855

  The present invention has been made in view of such a background, and it is possible to reduce the running cost of the entire drying equipment by reducing the cost required for the generation of the dry gas and the cost required for the deodorization of the exhaust gas. The technical challenge is to develop a drying facility that can handle new VOC emissions.

  That is, the drying equipment corresponding to the VOC discharge according to claim 1 raises the outside air to generate a drying gas, supplies the drying gas to the dryer, and dries the object to be dried. The exhaust gas discharged is deodorized by a deodorizing device, and further, a heat exchanger for exchanging heat between the deodorized gas discharged from the deodorizing device and the exhaust gas discharged from the dryer is provided, In a drying facility configured to supply exhaust gas as high-temperature exhaust gas to a deodorization apparatus, the deodorization apparatus includes a catalyst, and is used as a means for generating a dry gas by raising the temperature of the outside air. Is characterized in that a heat pump type hot air generator is provided.

  In addition to the requirement of claim 1, the drying equipment corresponding to VOC discharge according to claim 2 is characterized in that a heating device is provided between the heat pump type hot air generator and the dryer. It consists of.

In addition to the requirement of claim 1, the drying facility corresponding to VOC emission according to claim 3 is a means for raising the outside air to generate dry gas between the deodorized gas and the exhaust gas. The heat exchanger provided in the back | latter stage of the heat exchanger for performing heat exchange is applied.
The above problems can be solved by using the configuration of the invention described in each of the claims as a means.

  First, according to the first aspect of the present invention, the temperature of the deodorized gas in the deodorizing device can be lowered as compared with the case of using the direct combustion type deodorizing device, and as a result, the fuel consumption in the deodorizing device is reduced. can do. Further, since the temperature of the outside air is increased by a heat pump operated by electric energy, the running cost can be reduced as compared with the temperature increase of the outside air by the fuel and the temperature increase of the outside air by the electric heater.

  Furthermore, according to the invention described in claim 2, since the outside air (high temperature outside air) heated by the heat pump type hot air generator is supplied to the heating device, the fuel consumption or power consumption in the heating device is reduced. Running costs can be reduced.

  Furthermore, according to the invention described in claim 3, since the use of direct fuel is not required for the generation of the dry gas, the fuel consumption in the entire drying facility can be reduced and the running cost can be reduced.

FIG. 3 is a block diagram showing an embodiment in which a hot stove is provided as a means for heating the outside air and generating dry gas in the drying equipment of the present invention. It is a perspective view which shows two types of deodorizing elements which made the form different. The heat exchanger provided in the subsequent stage of the heat exchanger for exchanging heat between the deodorized gas and the exhaust gas as a means for raising the temperature of the outside air and generating a dry gas as the drying equipment of the present invention It is a block diagram which shows the Example by which was adopted. It is a block diagram which shows the existing drying equipment. It is a block diagram which shows the existing drying equipment which varied the structure.

  The form of the drying equipment corresponding to the VOC emission of the present invention is as shown in the following example as an example, but it is also possible to appropriately change this example within the scope of the technical idea of the present invention. It is.

The drying facilities 1 and 10 (hereinafter referred to as drying facilities 1 and 10) corresponding to VOC emission of the present invention are devices for performing, for example, food drying processing or drying processing of articles coated with paint. is there.
As shown in FIGS. 1 and 3, the basic configuration is that the outside air G 0 is heated to generate a dry gas G 2, and this dry gas G 2 is supplied to the dryer 2 to dry the object to be dried. The exhaust gas G3 discharged from the dryer 2 is deodorized by the deodorizing device 4, and heat is exchanged between the deodorized gas G5 discharged from the deodorizing device 4 and the exhaust gas G3 discharged from the dryer 2. The exhaust gas G3 discharged from the dryer 2 is heated to be supplied to the deodorizing device 4 in a state of being a high temperature exhaust gas G4.
The deodorizing apparatus 4 includes a catalyst 46b having a deodorizing function.
Furthermore, a heat pump type hot air generator 5 is installed as means for raising the temperature of the outside air G0 and generating the dry gas G2.

  The drying facilities 1 and 10 of the present invention have the above-described configuration as a basic configuration, but different mechanisms can be adopted as means for raising the temperature of the outside air G0 and generating the dry gas G1. Hereinafter, the configuration and operation mode of the drying facilities 1 and 10 will be described for each of the drying facilities 1 and 10 in which the respective mechanisms are employed.

[Example in which a hot stove is applied to raise the temperature of the drying gas]
First, an embodiment in which a hot stove 3 is applied as a heating device as shown in FIG. 1 will be described as means for generating a dry gas G1 by raising the temperature of the outside air G0. Incidentally, the drying equipment 1 shown in FIG. 1 adopts a so-called one-pass flow mode in which the exhaust gas G3 is exhausted to the outside, and the exhaust gas G3 discharged from the dryer 2 and the object to be dried It is used for the drying treatment of foods, coated products, etc., in which re-contact is not preferable.
First, as the dryer 2, a continuous box dryer (band dryer) is adopted as an example, and a drying chamber 20 in which an input port 21 and a discharge port 22 for an object to be dried are formed in an open state; In addition, a transport device 23 such as a belt conveyor passing from the input port 21 through the drying chamber 20 to the discharge port 22 is provided, so that it is dried from the input port 21 while being placed on the transport device 23. This is a dryer configured to be able to continuously dry an object to be dried entering the chamber 20.

In the drying chamber 20, an air supply port 24 is formed at a plurality of upper portions (three locations as an example), and an exhaust port 25 is formed at a plurality of upper portions (two locations as an example).
The dryer 2 may be a rotary aeration dryer, a fluidized bed dryer or the like.

  Next, the hot stove 3 is configured to include a furnace body 30 and a burner 31 as an example, and is configured to increase the temperature of gas supplied into the furnace body 30 by combustion of fuel in the burner 31. Is. An air supply port 32 and an exhaust port 33 are formed in the furnace body 30. As a heating device, an electric heater furnace may be used instead of the hot stove 3.

Next, the deodorizing apparatus 4 includes a preheating furnace 40 and a catalyst unit 45.
First, the preheating furnace 40 is provided with a burner 41. The heat generated by burning the fuel by the burner 41 raises the temperature of the gas supplied into the preheating furnace 40 from the air supply port 42, and the exhaust gas is exhausted. It is configured to discharge from the mouth 43.
Further, the catalyst unit 45 is provided with a deodorizing element 46 (the support base 46a carrying the catalyst 46b) therein, and the exhaust port 43 in the preheating furnace 40, the catalyst unit 45 in the catalyst unit 45, and the like. An air supply port 47 is connected.
According to the deodorizing apparatus 4 configured as described above, the gas supplied into the catalyst unit 45 from the air supply port 47 comes into contact with the catalyst 46b, so that the odor component is an organic substance (VOC). ), It is oxidized at a low temperature by the catalytic action of the catalyst 46b and converted to CO ₂ , H ₂ O, etc., and is exhausted from the exhaust port 48 in a deodorized state.

As an example of the support base material 46a, as shown in FIG. 2 (a), a honeycomb-shaped ceramic is adopted. A cerium oxide powder or the like as the catalyst 46b is mixed with water and a binder. The support base material 46a is immersed in the prepared slurry, and then dried and fired, whereby the deodorizing element 46 having the catalyst 46b supported on the surface of the support base material 46a is formed.
Further, a pellet-like deodorizing element 46P obtained by kneading the cerium oxide powder (light yellow powder) with water together with a binder, drying and firing can also be used. In this case, as shown in FIG. 2 (b), the deodorizing element 46P is arranged in the catalyst unit 45 in a state of being housed in a cage in which a metal net 46c is stretched around a frame 46d.

Next, the heat pump type hot air generator 5 includes a heat pump unit, and includes an evaporator 51, an expansion valve 52, a condenser 53, and a compressor 54 to form a heat pump cycle. There is, for example, one using carbon dioxide as a refrigerant. By adopting carbon dioxide as the refrigerant, the temperature of the high-temperature outside air G1 heated by the heat pump hot air generator 5 can be set to about 120 ° C. at the maximum. Incidentally, at present, heat pump units using carbon dioxide as a refrigerant have been put into practical use.However, when heat pump units having equivalent performance using other refrigerants are put into practical use in the future, this may be adopted. it can.
And the 10-35 degreeC heat source water W is supplied with respect to the said evaporator 51, Although illustration is abbreviate | omitted, the piping for this, a pump, etc. are provided. In the heat pump hot air generator 5, the heat retained by the heat source water W is recovered.

  The heat exchanger 6 is a device in which a pipe 61 is arranged in the housing 60 and performs heat exchange between a fluid passing through the pipe 61 and a fluid flowing outside the pipe 61. An air supply port 62, an exhaust port 63, an air supply port 64, and an exhaust port 65 are formed in the housing 60. The air supply port 64 and the exhaust port 65 are connected to both ends of the pipe line 61.

  The dryer 2, the hot air furnace 3, the deodorizing device 4, the heat pump type hot air generating device 5, and the heat exchanger 6 are connected by appropriate pipes as shown in FIG. First, the condenser 53 in the heat pump hot air generator 5 and the air supply port 32 in the hot stove 3 are connected by a pipe, and the blower 7 is installed in this pipe. Further, the exhaust port 33 in the hot stove 3 and the air supply port 24 in the dryer 2 are connected by a conduit, and further, the exhaust passage 25 and the air supply port 62 in the heat exchanger 6 are connected by a conduit. Connected. Further, the exhaust port 63 in the heat exchanger 6 and the air supply port 42 in the deodorizing device 4 are connected by a pipe line, and further, the exhaust port 48 and the air supply port 64 in the heat exchanger 6 are connected by a pipe. Connected by road. A blower 9 is connected to the exhaust port 65 in the heat exchanger 6.

The drying equipment 1 of the present invention is configured as described above as an example, and the operation mode thereof will be described below.
First, the heat pump hot air generating device 5, the blower 7, the deodorizing device 4 and the blower 9 are activated prior to the introduction of the material to be dried, and the outside air G0 is heated by the heat pump unit 20 to become the high temperature outside air G1. .
Next, the high temperature outside air G1 is further heated by the hot stove 3 that is started next, and becomes a dry gas G2.
Next, the drying gas G2 is supplied into the drying chamber 20 from the air supply port 24 and is exhausted from the drying chamber 20 to become exhaust gas G3.
Next, the exhaust gas G3 undergoes heat exchange with the deodorized gas G5 in the heat exchanger 6 to increase in temperature, and becomes high-temperature exhaust gas G4.
Next, the high temperature exhaust gas G4 is subjected to a deodorizing process in the deodorizing device 4 to become a deodorized gas G5, and is heated by the burner 41 at this time.
Next, the deodorized gas G5 is subjected to heat exchange with the exhaust gas G3 in the heat exchanger 6, the temperature is lowered, and the low-temperature deodorized gas G6 is exhausted to the outside.

Then, when the state of the drying equipment 1 is stabilized, an object to be dried is put into the dryer 2, and an example of the temperature of each gas at normal time is shown below.
Outside air G0: 20 ° C
High temperature outside air G1: 80 ° C
Drying gas G2: 200 ° C
Exhaust gas G3: 150 ° C
High temperature exhaust gas G4: 350 ° C
Deodorized gas G5: 500 ° C
Low temperature deodorized gas G6: 300 ° C

In the operation of the drying facility 1 as described above, in order to change the outside air G0 at 20 ° C. to the dry gas G2 at 200 ° C. required for the drying process of the object to be dried, the heat pump type hot air generator 5 generates electricity. The fuel is used as the energy source in the hot stove 3.
Note that the energy of the heat source water W is also used in the drying facility 1. This is because the heat of the heat source water W is recovered as the latent heat of vaporization of the refrigerant by the heat exchange action in the evaporator 51, and the refrigerant is the compressor. After the temperature has been raised and raised by 54, the refrigerant is condensed by the heat exchange action in the condenser 53, so that heat energy is given to the outside air G0 and the high temperature outside air G1 at 80 ° C. is obtained. The heat energy of 10 to 35 ° C. possessed by the heat source water W is normally irrelevant to the running cost because, for example, waste water discarded from other facilities is used as the heat source water W. Therefore, the running cost for generating the dry gas G2 in the drying facility 1 is based on the sum of the electric energy consumed by the compressor 54 and the fuel consumed by the hot stove 3. Moreover, even if the temperature of the wastewater of other equipment is lower than the temperature of the heat source water W, if it is the drying equipment 1, the heat energy held by the low temperature deodorized gas G6 is used as wastewater using a heat exchanger or the like. The waste water can be used as the heat source water W.

On the other hand, in the conventional drying apparatus 1 ′ shown in FIG. 4, in order to turn the outside air G0 ′ at 20 ° C. into the dry gas G2 ′ at 200 ° C., only the fuel is used as the energy source in the hot stove 3 ′. This is a running cost.
Thus, in the drying facility 1 that can use the energy of the heat source water that is irrelevant to the running cost to raise the temperature of the outside air G0, the total of the electric energy of the heat pump hot air generator 5 and the fuel consumed in the hot air furnace 3 is running. This makes it possible to realize a running strike lower than the running cost required for the hot stove 3 'of the drying facility 1'.
Incidentally, even if an electric heater is used in place of the hot stove 3 ', the drying equipment 1 can realize a lower running strike.

Moreover, in the deodorizing apparatus 4 in the drying facility 1 of the present invention, a high-temperature exhaust gas G4 at 350 ° C. is heated to 500 ° C. by the preheating furnace 40 of the deodorizing device 4 as a condition for obtaining a deodorizing ability equivalent to the deodorizing device 4 ′ of the drying facility 1 ′. It is necessary to raise the temperature to the extent. Thereby, deodorization by the catalyst element 46 is performed reliably, and as a result, a deodorized exhaust gas G5 of about 500 ° C. is obtained. That is, in the drying facility 1, the high temperature exhaust gas G4 at 350 ° C. is heated to 500 ° C., that is, the temperature difference is increased by 150 ° C.
On the other hand, in the drying apparatus 1 ′ of the conventional method shown in FIG. 4, the high temperature exhaust gas G4 at 450 ° C. is deodorized by the direct combustion method, and the deodorized exhaust gas G5 at 750 ° C. can be obtained. The temperature of the high temperature exhaust gas G4 ′ is increased to 750 ° C., that is, the temperature difference is increased by 300 ° C. That is, in the case of the drying facility 1, the degree of temperature rise of the high-temperature exhaust gas can be suppressed to be lower than that of the drying facility 1 ', so that fuel can be reduced accordingly.

Thus, since the drying equipment 1 of the present invention can reduce the fuel consumption in the deodorizing device 4 to be less than the fuel consumption in the deodorizing device 4 ′ in the conventional method, the deodorizing device 4 includes the catalyst 46 b. By adopting, it becomes possible to realize a reduction in running cost.
The drying facility 1 of the present invention can realize a significant reduction in running cost by combining the cost reduction effect by the heat pump type hot air generator 5 and the cost reduction effect by the deodorizing device 4 having the catalyst 46b. It will be.

In order to clarify such a cost reduction effect, the drying facility 1 ′ shown in FIG. 4 and the drying facility 1 of the present invention shown in FIG. 1 are operated to process the same object to be dried. Table 1 shows the results of trial calculations of LPG usage, electricity usage, LPG fluctuation costs, electricity fluctuation costs, annual reductions, and annual reduction rates.
In addition, about the drying equipment 1 of this invention, the trial calculation was performed when the temperature of the high temperature outside air G1 was 80 degreeC, and also the temperature of the catalyst (substantially temperature of the deodorizing waste gas G5) was 500 degreeC.
The other calculation conditions are LPG (5000 h / year, 100 yen / kg, 1.96 kg / m ³ , 3.00 t-CO ₂ / t), electricity (14 yen / kWh, 0.417 kg-CO ₂ / kWh). (Chubu Electric Power), load factor 70%).
As can be seen from the results in Table 1, in the drying facility 1 of the present invention, a trial calculation result with an annual reduction rate of variable costs of 21% was obtained.

In addition, the energy consumption when converted to crude oil was estimated using the provisional calculation table (heat / combined calculation) of the amount used, which is published on the website of the Energy Conservation Center, Japan.
As a result, the crude oil equivalent reduction rate was estimated to be 19% per year.

Furthermore, CO ₂ emissions were estimated using the list of calculation methods and emission factors based on the calculation / report / publication system published on the Ministry of the Environment website, and are shown in Table 3.
As a result, a trial calculation result that the CO ₂ emission reduction rate is 17% per year was obtained.

[Examples in which a heat exchanger is used to raise the temperature of the drying gas]
Next, as a means for raising the temperature of the outside air G0 and generating the dry gas G2, the heat exchanger 8 provided in the subsequent stage of the heat exchanger 6 for exchanging heat between the deodorized gas G5 and the exhaust gas G3. An embodiment to which is applied will be described.
In addition, the drying facility 10 shown in FIG. 3 deletes the hot stove 3 of the drying facility 1 shown in FIG. 1, and a heat exchanger 8 configured in the same manner as the heat exchanger 6 is provided at the next stage of the heat exchanger 6. It arrange | positions and uses this heat exchanger 8 as a means to heat up the high temperature outside air G1. For this reason, about the dryer 2, the deodorizing apparatus 4, the heat pump type hot air generator 5, the heat exchanger 6 (heat exchanger 8), and the blower 7 (blower 9), the apparatus similar to the above-mentioned thing is used. A description of each device is omitted here.
As the dryer 1, a rotary aeration dryer, a fluidized bed dryer or the like can also be adopted.

As shown in FIG. 3, the drying equipment 10 shown in this embodiment is a system in which the condenser 53 in the heat pump hot air generator 5 and the heat exchanger 8 are connected to the air supply port 82 by a pipe line. The blower 7 is installed in this pipeline. Further, the exhaust port 83 in the heat exchanger 8 and the air supply port 24 in the dryer 2 are connected by a pipe line, and further, the pipe line is connected between the exhaust port 25 and the air supply port 62 in the heat exchanger 6. Connected by. Further, the exhaust port 63 in the heat exchanger 6 and the air supply port 42 in the deodorizing device 4 are connected by a pipe line, and further, the exhaust port 48 and the air supply port 64 in the heat exchanger 6 are connected by a pipe. Connected by road. Further, the exhaust port 65 in the heat exchanger 6 and the air supply port 84 in the heat exchanger 8 are connected by a pipe line. A blower 9 is connected to the exhaust port 85 in the heat exchanger 8.
Incidentally, the drying equipment 10 shown in FIG. 3 adopts a so-called one-pass flow form in which a part of the low-temperature deodorized exhaust gas G6 is heat-exchanged with the outside air G0 to form the dry gas G2, The exhaust gas G3 that has been discharged and the object to be dried are subjected to a drying process such as a food or a coated product in which contact with the object to be dried is not preferable.

The drying equipment 10 of the present invention shown in this embodiment is configured as described above as an example, and the operation mode thereof will be described below.
First, the heat pump hot air generator 5, the blower 7, the deodorizing device 4 and the blower 9 are activated prior to the introduction of the material to be dried. The outside air G0 is heated by the heat pump hot air generator 5 and is heated to a high temperature. G1.
Next, the high-temperature outside air G1 is heat-exchanged with the low-temperature deodorized gas G6 in the heat exchanger 8 to be heated to become a dry gas G2.
Next, the drying gas G2 is supplied into the drying chamber 20 from the air supply port 24 and is exhausted from the drying chamber 20 to become exhaust gas G3.
Next, the exhaust gas G3 undergoes heat exchange with the deodorized gas G5 in the heat exchanger 6 to increase in temperature, and becomes high-temperature exhaust gas G4.
Next, the high temperature exhaust gas G4 is deodorized in the deodorizer 4 to become a deodorized gas G5. At this time, the high temperature exhaust gas G4 is heated by the burner 41.
Next, the deodorized gas G5 is subjected to heat exchange with the exhaust gas G3 in the heat exchanger 6 to lower the temperature to become a low temperature deodorized gas G6.
Subsequently, the low-temperature deodorized gas G6 undergoes heat exchange with the high-temperature outside air G1 in the heat exchanger 8, the temperature is lowered, and the low-temperature deodorized gas G6 is exhausted to the outside as the low-temperature deodorized gas G7.

Then, when the state of the drying equipment 1 is stabilized, an object to be dried is put into the dryer 2, and an example of the temperature of each gas at normal time is shown below.
Outside air G0: 20 ° C
High temperature outside air G1: 80 ° C
Drying gas G2: 200 ° C
Exhaust gas G3: 150 ° C
High temperature exhaust gas G4: 350 ° C
Deodorized gas G5: 500 ° C
Low temperature deodorized gas G6: 350 ° C
Low temperature deodorized gas G7: 230 ° C

In the operation of the drying facility 10 of the present invention as described above, the heat pump type hot air generator 5 normally discards, for example, 10 from other facilities in order to change the outside air G0 at 20 ° C. to the high temperature outside air G1 at 80 ° C. The heat energy of the waste water of ˜35 ° C. is recovered by the heat pump hot air generator 5 as described in the drying facility 1, and the heat energy is given to the outside air G 0 by the heat exchange action in the condenser 53. The high-temperature outside air G1 at 80 ° C. Further, the high temperature outside air G1 is heated in the heat exchanger 8 to be a dry gas G2 at 200 ° C.
Here, the energy consumed by the heat pump hot air generator 5 is the electric energy consumed by the compressor 54, and this becomes the running cost.
In addition, even when the temperature of the waste water of other equipment is lower than the temperature of the main heat source water W, the heat energy held by the low temperature deodorized gas G7 in the drying equipment 10 is given to the waste water using a heat exchanger or the like, The waste water can be used as the heat source water W.

On the other hand, in the conventional drying apparatus 1 ′ shown in FIG. 5, heat exchange is performed in the heat exchanger 8 ′ so that the outside air G0 ′ at 20 ° C. is similarly dried exhaust gas G2 ′ at 200 ° C. Only, with no apparent energy consumption.
However, in the drying facility 10 of the present invention, the deodorizing device 4 performs combustion so that the high-temperature exhaust gas G4 at 350 ° C. becomes the deodorized gas G5 (temperature difference + 150 ° C.) at 500 ° C., while the drying facility 10 ′ In the deodorizing device 4 ', combustion is performed such that the high-temperature exhaust gas G4' at 350 ° C is converted to a deodorized gas G5 'at 750 ° C (temperature difference + 400 ° C).
Therefore, since the fuel consumption in the deodorizing device 4 ′ is used to raise the temperature difference of 400 ° C., it is larger than the fuel consumption in the deodorizing device 4 that only needs to raise the temperature difference of 150 ° C. The deodorizing device 4 'has a higher running cost.
The total running cost of the compressor 54 of the heat pump hot air generator 5 and the deodorizing device 4 in the drying facility 10 of the present invention is lower than the running cost of the deodorizing device 4 'of the drying facility 10'. Therefore, when the drying process is performed under the same conditions, the running cost can be reduced by adopting the configuration of the drying facility 10.
Thus, the drying equipment 10 of the present invention requires the direct use of fuel by combining the heat pump hot air generator 5 with the deodorizing device 4 and the heat exchangers 6 and 8 including the catalyst 46b. In addition to the above, the drying facility 10 as a whole can realize a significant cost reduction that has not been achieved conventionally.

That is, the drying equipment 10 ′ shown in FIG. 5 can set the temperature of the dry gas G2 ′ to 200 ° C. or higher by setting the temperature of the deodorized gas G5 ′ to 750 ° C. or higher. For this reason, in the drying equipment 10 ′, when the deodorizing device 4 ′ having the catalyst 46b is applied, the combustion of the burner 41 ′ (the code 41 ′ in FIG. 5 is added at the time of application) is deodorized at 400 ° C. When combustion is performed such that the gas G5 'is obtained, the temperature of the exhaust gas G3' in the heat exchanger 6 'and the temperature of the low-temperature deodorized gas G6' in the heat exchanger 8 'are not sufficiently raised, and the dry gas Since the temperature of G2 ′ does not reach the desired 200 ° C., the desired drying operation cannot be performed.
In the above embodiment, the drying facilities 1 and 10 by the one-pass flow have been described on the assumption that the exhaust gas G3 and the deodorized gases G5, G6, and G7 are not preferably in contact with the object to be dried again. However, if the quality of the material to be dried does not deteriorate even when these gases come into contact with the material to be dried again, the present invention is applied to the drying facilities 1 and 10 by the so-called circulation flow that circulates and uses these gases. Can be applied.
Incidentally, the two-dot chain line shown in FIG. 1 or FIG. 3 is a pipe line for forming a circulation flow that uses the deodorized gas G6 or G7 for drying the object to be dried. By adopting this circulation flow, the running cost can be further reduced.

DESCRIPTION OF SYMBOLS 1 Drying equipment 10 Drying equipment 2 Drying machine 20 Drying chamber 21 Input port 22 Outlet port 23 Conveyance device 24 Air supply port 25 Exhaust port 3 Hot air furnace 30 Furnace body 31 Burner 32 Air supply port 33 Exhaust port 4 Deodorizing device 40 Preheating furnace 41 Burner 42 Air supply port 43 Exhaust port 45 Catalyst unit 46 Deodorizing element 46P Deodorizing element 46a Support base material 46b Catalyst 46c Wire net 46d Frame 47 Air supply port 48 Exhaust port 5 Heat pump hot air generator 51 Evaporator 52 Expansion valve 53 Condenser 54 Compressor 6 Heat exchanger 60 Housing 61 Pipe 62 Air supply port 63 Air exhaust port 64 Air supply port 65 Air exhaust port 7 Blower 8 Heat exchanger 80 Case 81 Pipe line 82 Air supply port 83 Air exhaust port 84 Air supply port 85 Exhaust port 9 Blower G0 Outside air G1 High temperature outside air G2 Dry gas G3 Exhaust gas G4 High temperature exhaust gas G5 Deodorized gas G6 Temperature deodorizing already gas G7 low temperature deodorizing already gas W heat source water

Claims (3)

  The outside air is heated to generate dry gas, and this dry gas is supplied to the dryer to dry the object to be dried. The exhaust gas discharged from the dryer is deodorized by the deodorizer, and further the deodorizer Is provided with a heat exchanger for exchanging heat between the deodorized gas discharged from the exhaust gas and the exhaust gas discharged from the dryer, so that the exhaust gas can be supplied to the deodorizer as high-temperature exhaust gas. In the drying equipment configured as described above, the deodorizing device includes a catalyst, and a means for generating a dry gas by raising the temperature of the outside air includes a heat pump hot air generator. Drying equipment that supports VOC emissions.   The drying facility corresponding to VOC discharge according to claim 1, wherein a heating device is provided between the heat pump type hot air generator and the dryer.   As a means for generating a dry gas by raising the temperature of the outside air, a heat exchanger provided at a subsequent stage of the heat exchanger for performing heat exchange between the deodorized gas and the exhaust gas is applied. The drying equipment corresponding to VOC discharge according to claim 1.

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