WO1980000183A1

WO1980000183A1 - Dryer

Info

Publication number: WO1980000183A1
Application number: PCT/JP1979/000164
Authority: WO
Inventors: Y Uji; H Kawata
Original assignee: Matsushita Electric Works Ltd; Y Uji; H Kawata
Priority date: 1978-06-26
Filing date: 1979-06-26
Publication date: 1980-02-07
Also published as: JPS556114A

Abstract

A dryer which comprises drying chambers (12a), (12b), (12c), (12d), a heat exchanger (15) for heating fresh air in heat-exchange with a clean gas, a blast line (16) for supplying fresh air into the drying chambers, a blast line (18) for leading exhaust air from the drying chambers to an exhaust air processing device (21), a blast line (23) for venting hot clean gas from the processing device, and control means (30), (34), (35) for controlling the air flow of these lines. Thus, the hot air source for the drying chambers is the fresh air heated in the heat-exchange with the high temperature clean gas. As a result, there is an improvement in the control response of heating chamber temperature and gas concentration, so that the dryer can be applied to articles in which organic substances are evaporated when dried.

Description

, Detailed

Title of the invention Dryer

Technical field

The present invention relates to a dryer having an exhaust air treatment function, in particular, an article that evaporates an organic substance during drying, for example, a resin-impregnated base material for a laminated product, that is, a resin resin. It relates to an improved dryer that is used for drying articles such as dryness, and makes it easier and more reliable to dry the room.

Background

Conventionally, as a general dryer, hot air whose temperature has been controlled by an air heater is blown to the surface of the article to dry it, and the exhaust air from the dryer is applied to the dryer. There is a method of cleaning using a multi-uri scrubber, but according to this method, exhaust by a vent lily and a scurano is performed. It is impossible in principle to completely remove harmful substances in the wind, and there is a limit to the drying speed and the temperature rise of air by a steam heater! ) And poor heat efficiency, the steam heater has poor response to the temperature control command, and therefore it is difficult to stabilize the quality of the articles to be dried. Due to the fact that it easily adheres to the surface, the number of maintenance operations will inevitably increase, and it will have some problems. [9] No effective measures have been found.

Therefore, with the aim of completely removing harmful substances, Dryers have been provided that guide the wastewater to a combustion furnace to burn it and further purify the exhaust air. However, the provided dryer is susceptible to contamination of the drying object by ash and other pollutants generated during the combustion of the exhaust air, and the interior of the dryer always has a lack of oxygen. As a result, there are unsolved problems such as cleaning, inspection, and treatment of the resin vapor inside the room, which could be dangerous.

Another problem is that, in the case of conventional dryers, the amount of air sent and exhausted from the dryer is usually controlled at a preset value. It is not possible to cope with the ever-changing drying load situation, and it is extremely dangerous that the gas concentration of organic substances in the drying chamber may fall within the explosion limit. It is necessary to take various measures to avoid costs. Furthermore, in the case of a dryer in which exhaust air is burned and reacted by combustion, in particular, the air is exhausted to stabilize the processing conditions and reduce the energy cost, and the gas concentration in the wind is reduced. It is necessary to keep the airflow at a predetermined value, but if this conventional method of controlling the airflow rate of the blown air is constant, this control cannot be performed for the same reason. It left a problem.

As another problem, the temperature control method in conventional dryers is based on the provision of a steam heater (heat exchanger) in the air circulation path inside the dryer room to control the amount of steam and the temperature. However, there is a disadvantage that the control system becomes complicated, and the heat exchange rate increases over time due to the attachment of the sky to the steam heater. Drops and

This leaves energy efficiency and maintenance issues that require removal work.

Another problem is that hot air blown into the drying chamber in conventional dryers is simply performed through a blowout opening directed toward the article to be dried. In particular, no consideration was given to uniformly supplying hot air to a flat material to be dried, such as a laminated material, which is a material for a laminated product, for example, a resin vapor. Therefore, in conventional dryers, the temperature of the blown-out gas is uniform over the entire surface of the blown-out surface, and therefore, the outlet of the drying temperature is not sure. However, it left a problem that it was unsuitable for use for the purpose of obtaining a high-quality laminated material without dry mulling.

-And finally, what is considered to be the biggest problem with conventional dryers is that the required amount of heat is supplied by steam or the heat for exhaust air treatment. Since it is performed in the form of adding a steam heater, a heat source for the steam heater and piping from the steam heater are required in addition to the dryer itself. It has significant disadvantages in terms of energy costs and costs related to the amount of piping and space for piping compared to those that rely solely on exhaust heat treatment heat sources. It was.

Disclosure of the invention

Therefore, a main object of the present invention is to achieve high thermal efficiency, and to reduce the cost of the dryer itself and the installation space of the dryer. It is about providing a dryer that can be reduced.

Another object of the present invention is to improve the responsiveness of the contact hole with respect to temperature or concentration and, as a result, to stabilize the quality performance of the article to be dried. It is about providing a dryer that can be used.

Another object of the present invention is to supply safe air to the drying chamber mainly, so that it is safe against oxygen deficiency accident.

[3] Also, mainly by providing a gas concentration outlet ¹ "function] [7] To provide a dryer that is safe against explosion accidents.

Another object of the present invention is to provide a dryer in which the heat exchanger used has little change with time and maintenance is easy.

-The purpose of the pond of the present invention is to provide a dry, dry, and high-quality dry product when drying a flat dry product such as a resin vapor. is there.

Therefore, in the present invention,

(1) Only fresh air is used as a source of hot air sent to the drying room

The exhaust air from the drying room is guided to an exhaust air treatment device for processing, and the heat is exchanged with the high-temperature clean gas from the exhaust air treatment device to produce the fresh air. Let's try to heat the air! ),

(2) By heating only the fresh air or the exhaust air by heat exchange with the high-temperature clean gas,

OMPI

Λ. WWiiPPOO (3) Therefore, the heat source of the dryer is made to depend only on the heat source of the exhaust air treatment device described above.

(4) The heat exchange with the gas causes the fresh air and the exhaust

While heating both, the hot air and the clean gas are each passed along the outer circumference of the duct for guiding the exhaust air, thereby keeping the exhaust air warm. To prevent the adhesion of knoll over the entire length of the inner surface of the pipe.

(5) The control of the air volume of the dryer is placed in the drying room.

The amount of air blown and discharged based on the gas concentration of organic substances in the air.

(6) The temperature control of the dryer is

Increase or decrease the amount of hot air blown according to the temperature

What to do,

(7) The dryer is equipped with a hot air outlet and this hot air

The air outlet of the air inlet faces the circulation path of the indoor gas generated during the operation of the air suction device, and is arranged long in the width direction.

(8) In most of the piping of the dryer, duct

'' Has a double structure, and its outside passage is

The object of the present invention described above has been particularly achieved.

Hereinafter, the present invention will be described based on Examples.

FIG. 1 and FIG. 2 are a simplified side sectional view and a flow explanatory diagram of a dryer configured based on a method for setting the air flow of a dryer according to the present invention. The interior of the dryer body U has 4 rooms 12a,

OMPI

'Λ _λ ― W1PO, 12b, 12c, 12d!), And the article to be dried: resin vapor 10 is sent from one side of the body 11! ) And dried while sequentially passing through the drying chambers 12a, 12b, 12c and 12d, and sent from the other side! ). The air blow line to the main body 11 is configured as follows. That is, a finleter I ³ and a suction fan M are provided at the end of the blowing line], and the fresh air taken in from here is the only hot air source . A damper 30 is provided between the filter 13 and the fan 14, and the opening of the damper 30 is automatically adjusted by an automatic control system described later. The dryer itself

The amount of air blown to 11 is adjusted. The fan line branches off into two paths after fan 14, one of which is equipped with a heat exchanger 15 and the other is equipped with a damper.

These 2 paths heat exchanger, it merged after da down bar ³ 1, that the blower main I Ndaku preparative within ½ after it. Da emissions Also great opening Bas 31 One Do Ni will I be automatically controlled, heat. Mixing ratio of the cool air passing through the heated One by the exchanger 15 the air ¾ and Dialog down bar ³ 1 side this It is controlled by the opening control of the drying chamber.

The temperature of the hot air sent to 12a, 12b, 12c, and 12d is adjusted accordingly. Main Lee Ndaku DOO I ⁶ or colleagues, the drying chamber 12a and through the four branch pipes, 12b, I2c, the hot air to 12d feed! ) Each branch pipe is provided with a dang 32a, 32b, 32c, 32d, respectively, and by these automatic opening control, hot air is supplied to each chamber 12a, 12b, 12c, 12d. The room temperature is adjusted according to the room temperature.

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WIPO The verse has been reduced. In order to increase the accuracy of air volume adjustment by the dampers 32a, 32b, 32c, 32d, it is necessary to keep the internal pressure of the main body 16 constant. Thus, the main body 16 is provided with a damper 33 for adjusting the internal pressure. Each of the drying chambers 12a, 12b, 12c, 12d is provided with a pair of upper and lower circulation fans 17, 17, respectively, and the hot air sent into each of the chambers is subjected to these fans 17, 17, The air is circulated in the room by the action of the air, while being uniformly mixed with the hot air in the room and sprayed onto the resin tray 10.

Drying room containing organic substances evaporating from resin vapor 10

The exhaust air of 12a, 12b, 12c, and 12d is collected through the branch pipe to the exhaust main body ½. The main body 18 is provided with two suction fans 19 and 20, and a damper 34 _s 35 is installed in front of each fan 19 and 20. These dampers 34 and 35 are also controlled by automatic opening control. By these actions, the exhaust air volume of the dryer is adjusted. Main Lee Ndaku DOO 1S is Ru Nodea whose end is connected to the exhaust air processor 21 straight燃方expression in developing next leading to this end, the wind exhaust processing device ² 1 and is integrally installed It passes through the heat exchanger 22. In Fig. 1, 2 1 1

, 212 are supply lines for kerosene and auxiliary air to be supplied to the exhaust air treatment device 21. The exhaust air from the dryer main body 11 is guided into the exhaust air treatment device 21, and the organic substances contained therein are completely burned and purified. It should be noted that, instead of the direct combustion method, a flue gas treatment apparatus may be adopted as the exhaust air treatment apparatus.

O. PI No. The high-temperature clean gas discharged from the exhaust gas treatment device 21 is mainly led to the clean gas discharge duct 23 through the heat exchanger 22 and released to the atmosphere. However, separately from the heat exchanger line, the heat is guided to the duct 23 through the branch duct 2 having the automatic control damper 36. The cleaning gas discharge duct 23 is designed to pass through the heat exchanger installed on the blower line, and is thus drawn by the fan 14. Some of the cold air (fresh air) is intended to be heated by heat exchange with clean gas. When the temperature of the clean gas at point X on the heat exchanger input side becomes lower than the set value, the damper 36 is opened, and a part of the clean gas from the exhaust treatment device 21 is subjected to heat exchange. The gas is added to the cleaning gas that has passed through the vessel 22, thereby raising the temperature at the X point. As shown in FIG. 1, branch ducts 25a, 25b, 25c, and 25d connecting the ventilation duct 16 and the drying chambers 12a, 12b, 12c, and 12d are exhaust ducts. The heat is passed along the outer periphery of the main body 18 and then sent to the chambers 12a, 12b, 12c, and 12d. , In addition, a part of the clean gas is sucked into the suction fan 26, and from the position close to the heat exchanger 22, the inside of the duct 27 that covers one side of the exhaust air duct 18 is duct 18. Flows along the outer periphery of the duct 18 and returns from a position close to the branch duct 25d, and passes through the inside of the duct 27 'covering the other side of the duct 18 along the outer periphery of the duct 18. And then released into the atmosphere. That is, the duct flows In this way, both hot air and clean gas! ) Keep warm

You have to be sick.

Since there may be only one suction fan for the exhaust line

However, when a trouble occurs on the dryer body side, etc., the exhaust air is released into the atmosphere and the fresh air is exhausted.

To the device 21]?

Two fan I ^9, 20 are disposed in施例. 28 is self

Purge port with dynamic shutter 281; 29 is automatic shutter

This is an air inlet with 29 1. When a trouble occurs,

The exhaust line is interrupted and the exhaust air is interrupted.

Is purged and fresh air is taken! )

Fig. 3 shows how to set the air flow of the dryer described above.

Fig. 3 is a block diagram of the air flow control system used for implementation. This

During normal operation, as shown in the block diagram,

Of organic substances that evaporate in the drying chambers 12a, 12b, 12c, 12d

The gas concentration is constantly measured.]

The highest value of gas concentration at each moment is selected and output as an electric signal

Is done. This output is based on a preset ratio.

Therefore, it is adjusted to increase or decrease.

Normal / normal switching switch and normal / start switching

Via switches, dampers 30, 34,

Is entered in 35, at which time the capabilities of each member are adjusted appropriately.

Pre-set for each member to adjust

The above input is increased or decreased according to the ratio. ί

As described above, this air flow control system is used to control the gas in each drying room.

OMPI WIPO '' The amount of fresh air and exhaust air to be taken into the dryer is adjusted based on the gas concentration. Therefore, according to such an air flow control system, it is possible to control the gas concentration in each drying chamber so that the gas concentration falls within the explosion limit. In addition, in order to stabilize the control of the exhaust gas treatment device and save as much fuel as possible, it is necessary to adjust the gas concentration of organic substances contained in the exhaust gas. According to the air volume control system, it is easy and possible to meet such demands.

In the above example, the gas concentration in each drying room was set to be lower than the set value (specific value within the safety range where the explosion limit was not reached). The maximum value is selected and the air volume is controlled based on this value, but this is not a limitation.

As described above. には When it is necessary to perform the air flow manually instead of using the self-control; .. Switch the normal-manual-time switching switch to the manual side. Off]? Also, since a large air volume is required when the dryer is started, always switch the start-up switch to the start-up side at this time. If an error occurs in the automatic control line, the normal-in-error switching switch automatically switches to the abnormal side. Then, an electric signal is output as the pre-set abnormal condition, and operation control corresponding to the abnormal situation is performed. Since the load on the dryer changes every moment, the above-mentioned abnormal condition is constant regardless of this change. Therefore, at the time of switching, there is a large difference between the 'and the immediately preceding output, and there is a concern that a traverse may occur due to this. Therefore, the output of the automatic control line is always input to the setting circuit for abnormal time conditions, so that the condition for abnormal time is always proportional to the output of the automatic control line at that time. I'm doing it.

Fig. 4 is a block diagram of the temperature control system. As shown in this figure, the temperatures of the drying chambers 1a, 12b, 12c, and 12d are set in advance in consideration of the loads and the like. On the other hand, the temperature in each drying room is constantly measured by a temperature sensor. Then, based on the comparison between the set value and the measured value, the input for controlling the degree of opening of the dampers 32a, 32b, 32c, and 32d at the inlet of each drying chamber is adjusted. I have.

In this temperature control system, the temperature of each drying chamber is adjusted by increasing or decreasing the amount of hot air blown in this way. In addition to the advantages that operation is simple and easy, there is also the advantage that control response is extremely good and accuracy is good because temperature control is performed by increasing or decreasing the air flow. Furthermore, according to this, unlike the conventional case, there is no danger that the heat exchange rate of the heat exchanger will change with time due to the attachment of a scar, and maintenance becomes easy. There is also an advantage that.

As described above, in order to control the temperature of the drying room by increasing or decreasing the amount of hot air, it is necessary to maintain a constant hot air temperature. Therefore, in this temperature control system, the highest value of the temperature set values of the drying chambers 12a, 12b, 12c, and 12d is selected.

OWPI And control the hot air temperature to keep it constant. In other words, when the temperature setting of each drying room is compared and the highest value is selected, the output signal is increased or decreased in accordance with a preset ratio, which is normally a normal operation. An abnormality is input to the dampers 31 and 36 as an opening control signal via the time switching switch. At this time, in order to properly adjust the capacity of each damper, Set the ratio set in advance for each bar.

—Therefore, the above input is increased or decreased, and the X point is determined based on the comparison between the measured temperature value at points X and の in Fig. 1 and the input value after the above adjustment. Finally, the opening control inputs of the dampers 31 and 36 are adjusted so that the temperature at the point を maintains the predetermined value. Note that the opening control inputs of the dampers 31 and 36 are also adjusted manually by a manual switch at the time of normal operation. In addition, when an error occurs in the automatic control line of the damper 31 "36, the normal time ^" error switch is automatically switched to the abnormal side.] 3 The pre-set abnormal condition is output to the dampers ³¹ and 36 as an electric signal.

The effects obtained by the implementation of the method for setting the air flow of exhaust air according to the present invention having the above configuration have the following effects. ? It is.

As mentioned at the beginning, the removal efficiency of the conventional deodorizer using the venturi scrubber method was at most about 70%, but according to the present invention, the exhaust air is straightforward. The treatment is almost complete because it is processed by a combustion type or catalytic type processing unit. Further, the present invention is derived from the exhaust air treatment device

O PI

W1PO Heats fresh air only through heat exchange with hot clean gas

In other words, make sure to get hot air, and

The exhaust gas is also heated by the exhaust gas.

To reduce costs and to eliminate hot air purifying gas.

To keep the exhaust air flowing around the perimeter of the wind duct.]? To minimize the loss of waste heat,

According to the present invention, the energy cost is greatly reduced.

In the method for setting the air flow of exhaust air according to the present invention, fresh air is heated by heat exchange with high-temperature cleaning gas.

As a result, the temperature of hot air can be significantly increased as compared with conventional steam heating. Therefore, according to the present invention, dry speed-up is possible. Also, as described above, the present invention

In this method, the heating of fresh air is based on heat exchange with clean gas and not on heat exchange with water vapor, but a conventional heat exchanger has a squeeze tube as in the past. Heat exchange rate

Has become worse]? Scale ^ "

It is likely to cause troubles in operation and maintenance such as maintenance.

According to the method for setting the air flow of exhaust air according to the present invention, since the drying chamber is heated by blowing hot air, the temperature is controlled by controlling the air volume. To do

Therefore, the response of the control is very good and the accuracy is good.

Further, the present invention uses only fresh air as a hot air source.

And no exhaust air is used. Therefore, according to the present invention, the quality and performance of the dried article are stabilized, and

improves. BU R EAU

OMPI WIPO.

, Since the temperature control method of the dryer of the present invention is such that the temperature of each drying chamber is adjusted by increasing or decreasing the amount of hot air blown, the apparatus is simplified! ? In addition to the advantage of easy operation, the temperature control by increasing or decreasing the air flow has the advantage of extremely high control responsiveness and high accuracy. Thus, there is no danger that the heat exchange rate of the heat exchanger will change over time due to reasons such as adhesion of the scale, and there is also an advantage that maintenance becomes easier.o

Next, a detailed description will be given based on the drawings showing the specific structure of the drying chamber of the dryer of the present invention.

Fig. 5 and Fig. 6 show the first example. A pair of upper and lower gas suction and blow-off devices 1 and 41 are provided in the drying chamber 40 indicated by a dashed line and opposed to each other. This device 1 is configured as follows. That is, a large number (but only two are shown in the figure for convenience of drawing) of gas blowing nozzles ^ 3… are provided on the opposite surface of the horizontally installed box 42. It is. The box 42 has an article to be dried passing through the drying chamber 40, that is, a width wider than the width of the resin vapor 60. Each of the knurls 43 has a rectangular side cross section, and is elongated in the width direction of the resin vapor 60. It goes without saying that each of the nozzles 43 communicates with the inside of the box 42. A fan box 5 containing two suction fans 44 and 4 is mounted on the rear opposite surface of the box 2. Needless to say, the inside of the fan box 45 communicates with the inside of the box 42. Slightly wider than box 42 A fanlettor 46 is applied to the front opening (suction port) of the fan box 45 having the width. By the operation of the suction fans 4, 4, the gas in the drying chamber 40 is sucked into the fan box 45, and is blown out from the many nozzles 43 through the box 2. . The resin vapor 60 is floated and dried by the gas blown out from almost the entire surface of Okina 2. The blown gas circulates in the room in a wide state as shown by the dashed arrow in the figure, and is sucked into the gas suction and blowout device 41 again.

In order to maintain the temperature in the drying chamber 40, hot air is constantly blown into the drying chamber 0. Sides or these ducts ⁴ 7a for rather guiding the hot air to dry. Chamber 40 is two upper and lower hot air blown out les for ducts 48, 48 protrude horizontally ^ Ru. The hot-air outlets ⁴⁹ , 49 of the hot-air blowing ducts 48, 48 extend long in the width direction of the circulation of the indoor gas, particularly the operation of the gas suction and blow-out device 41, which occurs. It is formed in the form of a 'slit-like' ..] and faces two fan boxes, the corresponding front opening of 45 (suction port). I have. That is, the outlets ⁴⁹ , ⁴⁹ of the hot air respectively face two gas circulation paths generated in the room. Duct 48 is designed to be narrower as it goes to the tip so that the amount of hot air blown out is uniform throughout the length of the outlet. You.

⁴ 7b in the drawing is a duct for exhaust air.

In the above embodiment, the room gas is moving in the direction of

f O PI The present invention relates to a dryer configured to circulate in parallel with the air, but as described below, the present invention relates to a dryer in which the indoor gas flows in a direction orthogonal to the traveling direction of the resin vapor 60 as described below. Dryers configured to circulate may also be implemented.

That is, in the drying chamber of the second example shown in FIGS. 7 and 8, a pair of upper and lower gas suction and blowing devices 51 and ¾ are provided in a drying chamber 60 indicated by a dashed line. The point that each device 51 is provided with a box 52 having a large number (but only four pieces are shown in the figure) of gas blowing nozzles 3 that are opposed to each other is provided. Same as the dryer shown in Fig. 5 and Fig. 6, but with the gas suction and blow-off device of this dryer

In FIG. 51, as shown in FIGS. 5 and 6, a suction port is not provided so as to fully extend in the width direction of the reg- isne 60 ", and the box K is not provided. The circular hole 54 formed in the center is the suction port, and the indoor gas is sucked in by the action of the suction fan 55 installed here. Since the gas is blown out, when the gas suction and blow-out device 51 operates, as shown by a broken line in the figure, the gas blown out from the nozzles 53... After hitting the vapor 60, it goes around the left and right sides of the drying chamber 50 and is sucked into the circular hole 54. Therefore, the traveling direction of the resin vapor 60 is set in the room. This means that there are four gas circulation paths that circulate in the orthogonal direction, up, down, left and right.

Therefore, in this embodiment, two ducts 56 a and 56 a for guiding hot air into the drying chamber 60 are respectively

OMPI

, T10 In the room, the ducts are branched into two hot air blow-out ducts 57, 57 arranged along the left and right sides of the box 52. The hot-air outlet 58 of each hot-air outlet duct 57 is opened outward and extends in the width direction of the indoor gas circulation path shown by the broken line in the figure. It is configured to be Thus, also in this dryer, the outlets 58 of each hot air are provided so as to face the respective circulation paths. Duct 57 is designed to be narrower toward the tip so that the amount of hot air blowout is uniform throughout the length of the outlet. I have.

In the figure, 56b is an exhaust duct.

The indoor gas circulates in the drying chamber in a wide state (usually about 1 to 2 m in width), and when hot air is supplied to the spot, the gas A high-temperature gas mixed with the supply hot air and a low-temperature gas not mixed are sucked into the suction blow-out device. However, since this temperature difference is eliminated during the passage of room gas through the gas suction and blow-out device, it eventually blows out to dry articles such as resin vapor. Gases with different temperatures are blown at different locations. Therefore, it is extremely difficult to control the drying temperature, and the quality of the dried product may be deteriorated.

However, according to the present invention, as described above, the outlet of the hot air faces the circulation path of the indoor gas, and As shown by the solid arrows in the figure, the hot air blows out uniformly over the entire width of the circulating gas, as shown by the solid arrow in the figure.Therefore, the circulating gas spreads over the entire width. Hot air is mixed uniformly. ,

Therefore, the gas sucked into the gas suction and blow-off device has no temperature distribution and is almost always at a constant temperature. As a result, the temperature of the gas blown out of this device becomes uniform over the entire range of the blowout surface. Therefore, according to the present invention, it is easy to control the drying temperature, and a high-quality dried product with a high drying mura can be obtained.

According to the results of the experiment, when hot air was mixed into the circulating gas in the form of a spot, the difference in the temperature of the blown gas was about 10, but according to the implementation of the present invention. Thus, this temperature difference could be reduced to about 1.

In the present invention, the outlet of the hot air does not necessarily have to be a single one as in the above-described embodiments, but may be, for example, a number of small ones. The holes may be scattered in the width direction of the circulation path of the indoor gas.

Each of the above examples is described for one drying chamber.However, when one dryer has a plurality of drying chambers, all the drying chambers are configured in the same manner as described above. That is not to say.

Next, a specific example of the double duct used in the present invention to keep the exhaust air by hot air or clean gas is used.

OMPI

-, WIPO To explain this in an embodiment, first, the inventors have developed a double duct as shown in FIG. 9 in order to achieve the foregoing. In other words, in this double duct 71, an inner pipe 72 for passing exhaust air is sheathed by an outer pipe 73, and hot air for warming flows between the inner pipe 72 and the outer pipe 73. The flow passage 74 is formed. Since the double duct 71 has the above-described structure, it has an advantage that it is easy to manufacture and requires a conventional heater winding work. The flow path 74 was used as a flow path for hot air to blow into the dryer.], And as a flow path for high-temperature clean gas released into the atmosphere after exhaust air treatment. Therefore, since the exhaust air passing through the inner pipe 72 can be kept warm, there is also an advantage that no electricity bill or steam bill is required for keeping warm. However, in this double duct 1, the connection of the respective flow passages 74, 74 of the two connected double ducts 71, 7 7 was provided in the respective outer pipes 73, 73. The outer pipe 73 connects the inner pipe 72 to the flange 77 so that the inner pipe 72 is connected to the technical pipes 75 and 75 and the connecting pipe 76 connected thereto. In addition to the fact that it is not covered with a jacket, it has the disadvantage that the insulation of the flanged part is not perfect, so that the toner easily adheres to the inner surface of this part. When connecting the heavy duct 71, there were inconveniences, such as the necessity of installing the connecting pipe 76 in addition to the main pipes.], But it was still not satisfactory enough.

Therefore, the inventors have to further improve this problem. We have developed a double duct like this.

That is, as shown in FIG. 10 and FIG. 12, the double duct 80 according to the present invention comprises a pipe 81 for passing exhaust air and the like, and flanges attached to both ends thereof. 82, 82, and two outer bodies of a cross-sectional shape that partially cover the upper and lower parts of the tube 81 so as to form two fluid flow paths 83, 83 over the entire length outside the tube 81. 85, 85 and a large number of holes 85 drilled in both flanges 82, 82 so as to open the above-mentioned distribution channels 83, 83 to the outside. is there

Since the double duct 80 according to the present invention is configured as described above, it has a simple structure and does not require a conventional operation of winding a heat retaining heater. and, flow path 8 3, 83 to blow hot air and high temperature of the clean gas to the ^dryer; because it is a child that is responsible for thermal insulation of the exhaust air I'm in and the child passing the scan, electric bill and steam for heat insulation Needless to say, it has the advantage of not requiring a generation. Further, this double duct 80 is formed by connecting each of the flow passages 83, 83 of the two connected double ducts 80, 80 with holes 85, formed in the respective flanges 82, 82. 85, and the jackets 84, 84 cover the tube 81 over its entire length, so that the entire length of the tube including the flange portion is completely reduced. It is kept warm and covers the entire length of the inner surface of the pipe.

In addition to the advantage of preventing sticking, the duct has the advantage of not requiring the work of installing the connecting pipe 76 as shown in the double duct 1 in FIG. 9 when connecting ducts.

OMP

W1P The double duct according to the present invention is a double duct in which the outer jacket partially covers the pipe body as in the above-described embodiment, or a double pipe shape that covers the entire circumference of the pipe body. There is also.

However, as in the above-described embodiment, the flow path of the heat-retention fluid was set to two.

When a path is formed, as shown by the arrow in FIG. 2, one path is set as the outward path of the heat-retaining fluid, and the other path is set as the return path. This eliminates the inconvenience of setting up separate ducts. Therefore, this configuration is very convenient because duct connection work can be reduced and the space for duct piping can be reduced.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1 is a simplified side sectional view of a dryer constructed based on the present invention, Fig. 2 is a flow explanatory diagram of the same, and Fig. 3 is a block diagram of an air flow control system used for carrying out the present invention. Fig. 4 is a block diagram of the temperature control system. FIG. 5 is a plan view showing one embodiment of a drying chamber used in the dryer of the present invention, FIG. 6 is a partially cutaway side view of the same, and FIG. 7 is a drying machine used in the dryer of the present invention. A perspective view showing another embodiment of the chamber, FIG. 8 is a plan view of the same as above, and FIG. 9 is a part of a double duct 'which is compared with a double duct used in the dryer of the present invention. Fig. 10 is a partially cutaway side view of an embodiment of the double duct used in the dryer of the present invention, Fig. 11 is an enlarged front view of the same double duct, Fig. 12 Figure 10 is an enlarged cross-sectional view taken along the line IV-IV. Figure 13 is Figure 10 is an enlarged view taken along the line V-V.

UK Hi, OMPI It is an end elevation.

Claims

The scope of the claims

(1) Drying room and sucking fresh air and supplying it to the drying room

A fresh air blowing line, an exhaust processing device for processing exhaust air from the drying chamber, and an exhaust line for guiding exhaust air from the drying chamber to the exhaust processing device. And a clean gas blowing line for releasing high-temperature clean gas from the exhaust air treatment device, and an air volume control means for controlling at least one of the three lines. Including and sent to the drying room described above! In this case, only fresh air is used as a hot air source, and the fresh air is supplied to the exhaust air treatment device.

A dryer characterized in that it is heated by heat exchange with high-temperature cleaning gas that comes out of water.

(2) The above-mentioned cleaning gas has the above-mentioned exhaust air in addition to the fresh air.

• The dryer described in Paragraph 1 of the claim, which is used for heating and keeping heat ₉

(3) Dougs, which constitute the exhaust line,

By flowing gas or fresh air, or both, along its outer periphery.]?

Dryer according to the item.

(4) The air volume control means responds to the room temperature of the drying chamber.

2. The dryer according to claim 1, wherein the amount of the fresh air blown is increased or decreased to perform the temperature control of the drying chamber.

(5) The air volume control means includes:

Increase or decrease the amount of fresh air and the amount of exhaust air as described above according to the gas concentration, and The dryer according to claim 1, wherein the drying is performed.

(6) The drying chamber is provided with a gas suction blow-out device that sucks gas in the room and blows out the dried object, and the hot air blow-out port is provided with 2. The dryer according to claim 1, wherein the dryer faces a circulation path of room gas generated during operation of the gas suction and blow-off device and is elongated in a width direction thereof.

(7) The duct constituting the exhaust line includes a pipe, a flange attached to both ends thereof, and a fluid flow path outside the pipe and extending over its entire length. In order to open the above-mentioned pipe partly or entirely, the outer jacket body and the holes formed in both the flanges so as to open the above-mentioned flow passage outward. Claim 3 consisting of

-The dryer described.

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