JPS5844314Y2 - Continuously moving web dryer - Google Patents

Description

[Detailed description of the invention] The invention is an apparatus for drying a web that continuously moves upward through the center of a main combustion space by burning the flammable organic liquid carried along with the web. an apparatus having an outwardly housing comprising an inlet and an outlet for the web and a combustion chamber with heating and ignition means disposed adjacent the inlet and having at least one combustion air inlet and a waste gas outlet; Pertains to.

In this type of clever device (German Patent Specification No. 2
No. 214,714) (see FIG. 4) A relatively large combustion chamber is provided, through which the web 405 to be dried passes in a generally vertical direction, the web outlet 417 being sealed by a safety metal roller 416; An air mass 403 is arranged at one end thereof, a waste gas outlet 404 at the other end, and in addition a safety nozzle 410 projects into the combustion chamber and is directed onto the web, via which it can stop the combustion if necessary. Gas can be introduced.

The essential drawbacks of this known device are the uneconomical use of the gases formed by the combustion of flammable liquids, the too slow-response safety measures, and the relatively There is a danger that a large proportion of residual toxic substances will come out of the device with the web.

Therefore, the purpose of the present invention is to improve the conventional device described above,
In particular, the combustion gases formed inside the combustion chamber, in particular the heat contained in these gases, can be used advantageously in the drying chamber, while at the same time the combustion of the organic liquid is safe and the combustion and The purpose of the present invention is to provide an improved structure so that the function of the drying process can be performed with high reliability.

According to the present invention, this problem was solved as follows.

That is, an apparatus for continuously moving a web by burning a combustible organic liquid carried along with the web, the apparatus comprising: an outer housing including a combustion chamber with an inlet and an outlet opening for the web; heating and ignition means disposed adjacent to the opening and at least one combustion air inlet opening and a waste gas outlet for feeding the web substantially vertically (upwardly) through the combustion chamber; A continuously moving web drying apparatus provided with means (a) in which the combustion chamber 3 is separated by two spaced apart heat dissipating walls 10, 108 of a suitable heat dissipating material; divided into a main combustion space 9 surrounded by 108 and an after-combustion space outside the heat dissipation wall, through which the web 1 is guided (upwards); (b) waste gas guide wall 12 and 123 are disposed apart from the rear side surfaces (rear surfaces) of the heat radiation walls 10 and 101 on the opposite side to the main combustion space, thereby creating counterflow between the rear side surfaces (rear surfaces) of the heat radiation walls. forming a passageway by which the waste gas leaving (rising) the main combustion space 9 is directed into the after-combustion space and into the countercurrent passage in which the gases are is guided in a countercurrent manner independently of the combustion gases flowing (upwards) in the main combustion space 9; (C) in the after-combustion space 11, the waste gas guiding wall 12 directed downward; 12a surrounds the waste gas discharge opening 13 disposed below, so that at least a part of the waste gas is discharged along the rear side (back surface) of the heat dissipation walls 10, 101. It was made to flow toward the opening 13.

According to the above structure of the present invention, in order to dry the web entering the chamber by burning the organic liquid carried along with the web, the organic liquid is heated by the heating means disposed near the web inlet and ignited. ignited and combusted by means, but since the combustion gases formed during this combustion still contain a significant portion of combustible substances, the waste gases are kept in this chamber for a longer time and their It is used by changing the direction and passing it behind the heat radiation wall, and further heating the heat radiation wall from behind so that it finally becomes red hot.

In the post-combustion space, there is provided a waste gas guide wall extending substantially downward, which hides and encloses the waste gas outlet communicating with the intake opening of the waste gas fan. The waste gas is forcibly transported along, so that it can reach the waste gas outlet only after essentially utilizing the combustible substances contained therein.

This adds heat dissipation in the space surrounded by the heat dissipation wall through which the web passes, but this is so powerful that after a relatively short start-up time the igniter may be switched off again.

In this way, an extremely economical utilization of the organic liquid (in particular methanol) carried along with the web is obtained, with the advantage that reliable drying of the web is carried out in a very safe manner.

Preferably, the heat dissipation wall is made of metal or ceramic material with high radiation efficiency.

Furthermore, by controlling the rotational speed of the waste gas fan, which extracts the waste gas from the post-combustion chamber, according to the combustion chamber temperature, on the one hand an optimum utilization of the combustion gases is obtained, and on the other hand a reliable combustion drying of the web indoors. This is especially convenient.

According to a particularly advantageous development of the invention, a post-airing space is associated with the web outlet, in which an air stream is blown onto or sucked out of the web.

This feature allows for counterflow of air to the dried web exiting the chamber.

Any residual toxic substances still adhering to the web are thus removed from the web leaving the chamber, and said toxic substances no longer enter the atmosphere.

Furthermore, at the same time a slight preheating of the fresh air to be introduced into the after-combustion space is obtained, and at the same time the dried web also undergoes some cooling.

In the present invention, it is further advantageous if at least the area between the web inlet of the chamber and the heating means is provided with spray pipes on both sides of the web, which can selectively supply water or steam.

These spray tubes constitute a particular safety measure, with which water can be sprayed onto the web in particular in the event of a fire hazard.

This is a particularly quick-acting measure.

According to yet another feature of the invention, these spray nozzles can also be operated with steam during the heating period to avoid burning of the web due to excessive heat dissipation.

A shutter, such as that used in this area in some known devices, can be omitted when using water or steam spray tubes.

Another feature of the present invention contributes to optimal drying.
The web feed rate can be controlled according to the residual moisture.

This is because, in the tests on which the present invention is based, if the web speed is controlled by this residual moisture,
This is because it has been found that a particularly reliable adjustment can be obtained.

The present invention will be explained more clearly in the following embodiments with reference to the accompanying drawings.

In FIG. 1, the drying device serves to dry a web 1 of material that is conveyed continuously in the direction of arrow 2 through a combustion chamber 3. In FIG.

In this case, the web 1 is conveyed substantially vertically (in a substantially vertical longitudinal midplane of the device) through the combustion chamber 3 using the feeding means described below.

The device has an outer housing 4, the housing 4
A combustion chamber 3 is arranged inside.

A web inlet 6 is provided in the bottom 5 of the outer housing 4 and is associated with a type of lock 7 through which the web 1 and a small amount of outside air enter the combustion chamber 3.

A heating means, preferably two infrared radiators 8, is provided in the combustion chamber 3 slightly above the web inlet 6, and these two radiators 8 are arranged on both sides of the web 1 with appropriate separation. .

Although not shown, ignition means (for example, a gas flame for single ignition at the start of operation) is provided.

A narrow combustion space 9 is provided extending over the heating means 8, through which the web 1 to be dried passes.

The combustion space 9 occupies most of the height of the combustion chamber 3.

This main combustion space 9 has two preferably metal heat dissipating walls 10.
, 101.

These heat dissipation walls 10, 10a are connected to the web 1 within the combustion chamber 3.
It is provided on both sides of the combustion chamber 3, separated from the web, and is arranged in the combustion chamber 3 in a substantially vertical manner or in a form that extends slightly upward.

The upper end 10', 10a' of this radiation wall 10, 10a is bent towards the web 1 and ends at a small distance from the web 1 or from the web feed plane.

Further, in the combustion chamber 3, a post-combustion space is formed outside the heat radiation wall 10.10H.

In the upper part of the combustion chamber 3, the after-combustion space has a widened gas collection and mixing section 11 and, apart from the web 1, a heat dissipation wall 10.
, 10 a is provided with a waste gas guide wall 12.12 a.

These waste gas guide walls 12, 12a are connected to the main combustion space 9.
The waste gas that rises and is discharged into the after-combustion space is led from the gas collection and mixing section 11 to the heat dissipation wall 1 separated from the web 1.
0,103, descends along this back, and then flows out from the waste gas outlet 13.

For this reason, most of the waste gas guide wall 12.12H is provided behind the heat dissipation wall 10.10H, parallel to it and isolated from it.

In this way, the heat radiation walls 10, 10a and the waste gas guide wall 1
2.degree. 12a, a countercurrent passage is formed in which the waste gases flow in the opposite direction to the combustion gases in the main combustion space 9.

The waste gas guide wall 12 , 122 surrounds the waste gas outlet 13 , and the waste gas outlet 13 is connected to the inlet 14 a of the waste gas fan 14 .

The motor of this fan 14 can be controlled so that its speed is adjusted depending on the combustion space temperature.

As is clear from FIG. 1, in particular, the main combustion space 9 and the after-combustion space 11 are surrounded by a heat insulating body 16.

The heat insulating device 16 consists of a side wall 16a, an upper lid 16b, and a lower bottom 16C, and passage openings of suitable size for the web 1 and the supplied outside air are provided in the lid 16b and the bottom 16C.

As clearly shown in FIG. 1, the insulating side wall 16a is provided within the side walls 4a, 4b of the outer housing 4 at a distance therefrom, so that a portion of the combustion air drawn into the combustion chamber 3 is diverted from this side wall 16a. It can be introduced between double walls.

A web outlet 17 (approximately perpendicularly above the inlet 6) is provided at the top of the heat insulating lid 16b of the combustion chamber 3.

This outlet 17 is likewise provided with a lock.

A feeding roll 18 is provided above the web outlet 17,
Ensure continuous feeding of the web through the device (in the direction of arrow 2).

A rear ventilation space 19 is provided on the upper insulating lid 16b of the combustion chamber 3 and is associated with the web outlet 17.

A feed roll 18 is also disposed within the rear ventilation space 19 relatively close to and above the web outlet 17.

The rear ventilation space 19 has a web outlet in the form of a slot 20 extending to the right in FIG.

Through this web outlet slot 20, fresh air can be introduced into the afterventilation space 19, as indicated by the arrow 22, so that the web fed from the combustion chamber 3 is vented with this air.

The outside air, slightly heated in this way and loaded with residual toxic substances from the web, is passed through the outside air supply opening 23 in the area of the web outlet 17 into the enlarged gas collection and mixing section at the top of the after-combustion space 11. .

In FIG. 1, as shown by the dashed line 4' and the arrow 24, when using the drying device of the present invention, the entire device housing is divided into two parts in the vertical feeding plane of the web 1, that is, at the position of the line 25, and the two parts are slightly shared. It is advantageous to remove one split housing (the left half in FIG. 1) from the other and return it to the parent.

Although it is clear that the two halves of the housing could be separated from each other and returned to the parent body, it is structurally more economical to make only one of the halves movable.

This represents a safety measure, on the one hand, and, on the other hand, allows for a change in space, thus optimizing the drying operation by improving its adaptability to various web types and moisture absorption, and also in the event of a need to stop the operation. This has the effect of preventing the web from burning if this occurs.

An important feature of the invention in the drying device is also the spray tubes 26 provided on both sides of the web 1 in the area between the web population of the combustion chamber 3 and the heating means 8.

This spray tube 26 can be supplied with ice or sand as required.

These spray pipes 26 are provided as a security measure and water is supplied in the event of a fire.

When the drying device is started up, i.e. while the infrared radiator 8 of the co-heating means is in operation, a fine mist of water or steam may be sprayed onto the web 1 from the spray tube 26, thereby On the one hand, infrared radiation is absorbed, and on the other hand, the web 1 can be cooled to prevent burning of the web during the heating period.

Similar water spray pipes 26 a and 26 b may be provided on both sides of the web 1 behind the web outlet slot 20 in the afterventilation space 19 and in front of the web population 6 in the combustion chamber 3 .

It will further be shown that the feed roll arranged in the after-venting space 19 above the web outlet 17 can be adapted to various purposes of the drying device.

That is, apart from the normal structure that only transports the web 1,
This roll may be, for example, in the form of a suction roll with a ventilation surface, so that the desired counterflow of the web 1 exiting from the combustion chamber 3 in the afterventilation space 19 is carried out solely or in addition via this suction roll. can be raised against the outside air supply from the outlet slot 20.

The feed roll can also be heated with steam or cooled with water.

Water cooling is beneficial for heat sensitive materials and low material moisture, while steam or steam heating prevents condensation and contributes to heat sensitive web uniformity and material moisture.

In addition to the above-mentioned possibility of counter-airing the dried material web in the afterventilation space, it is also possible to blow outside air onto the dried web using a nozzle.

An example of such an embodiment will be explained with reference to FIG.

For simplicity, FIG. 2 shows only the rear ventilation space provided in the upper part of the combustion chamber, and the other parts are the same as in FIG. 1.

As in the previous embodiments, a feed roll 118 is arranged in the afterventilation space 119 above the web outlet 117 of the combustion chamber 103, which consists of a type of lock.

In this case, the combustion space is defined as the rear ventilation space 1 by the heat insulating lid 116b.
It is insulated from 19.

In the aftervent space 119, the dry web 101 from the combustion chamber 103 is bent by a feed roll 118 and conveyed generally horizontally (in the direction of arrow 102) to an exit slot 120, where it is directed downwardly by a deflection roll 121. It's bent.

As is clear from FIG. 2, outside air is supplied above and below the web 101 in a common part 119a of the rear ventilation space 119 adjacent to the web exit slot 120.

130a are provided respectively.

Each of these fresh air supply chambers 130, 130a has a small number of fresh air supply nozzles 131, 131a, which extend over the entire width of the web and are connected to arrows 132, 132.
It is preferable that the top of the web 101 is directed inward when viewed from inside the rear ventilation space 119, as shown in FIG.

Each outside air supply chamber 130, 130a may be provided with a perforated bottom 134, 134a for supplying outside air into each chamber in the direction of arrows 133, 133a.

Also, the supply chambers 130, 130a facing the web 101 for counter-flow ventilation of the web 101 (7) Walls 135, 135
It is also expedient to form a passage 136 which leads from the area of the web exit slot 120 to the interior of the rear ventilation space 119 in a diverging manner.

Another embodiment of the upper part of the combustion chamber will now be described with reference to the partial sectional view of FIG.

Since this embodiment includes only the interior of the combustion chamber 203, detailed description of other components in the upper part of the device will be omitted.

These may be made as shown in FIGS. 1 and 2.

An important difference between the embodiment shown in FIG.
0 a (17) The deflection plate 231 is provided in the area between the upper ends 210', 210a' and the web outlet 217.

This deflection plate 231 has a web passage slot 230;
The combustion gas coming from the main combustion space 209 is transferred to the post-combustion space 211.
It serves to bend inward.

Since the deflection plate 231 is suitably insulated from the lid 216b of the heat-insulating container 216, the preheated outside air supplied from the after-ventilation space 219 is not restricted to enter the after-combustion space 211 and deflected combustion in the upper part. Can be mixed with gas.

Moreover, when the web 1 passes upwardly into the slot 230, the combustion gas/steam layer covering both sides of the web is largely removed from the web and introduced into the interior of the after-combustion space 211 by the deflector plate 231. .

This feature further enhances the performance of the drying device of the present invention.

In each of the two embodiments, it is of course possible to introduce not only unpreheated outside air but also outside air that has been preheated in an appropriate manner into the rear ventilation space of one side of the combustion chamber 1.

This preheating of the outside air may be carried out in various ways, for example by means of a heat exchanger (not shown), by means of a double wall consisting partly of a device housing and an insulating arrangement, or by any other desired method.

It is also possible to utilize the magical gas removed from the device to impart heat contained in the waste gas to the liquid.

It is also possible for the drying device to have a width perpendicular to the plane of FIGS. 1 to 3, the width of which normally matches the associated web width, or of variable width to dry. Obviously, it may also be associated with a specialized web.

Regarding the introduction of outside air into the combustion chamber using a waste gas fan, generally speaking, a relatively small amount of outside air enters the combustion chamber through the web entry loss slot 1~, while for example 30% of the outside air is vented from above. Preferably, the latter enters the after-combustion chamber via the chamber, with the remainder (mostly) passing between the double wall formed by the side walls of the device housing and the insulating housing.

This latter feature, on the one hand, preheats the outside air and, on the other hand, improves the thermal insulation properties, resulting in a considerably thinner insulation wall compared to known constructions, resulting in considerable savings in material.

If the device is periodically taken out of operation, the infrared radiator 8 forming the heating means may be pivoted, for example between 90[deg.] and 180[deg.].

A stabilizing roll 30 is provided near the web inlet 6 in order to ensure that the web passes between the infrared radiators and correctly centered between the radiating walls, thus making the combustion particularly uniform.

Also, first of all, there is a frame monitor (
It is expedient to use the UV signal as a fire alarm (conveniently arranged at the beginning of the flame area) and secondly as a fire alarm (conveniently arranged at the exit end of the shaft).

To prevent thermal stresses, the heat dissipation wall is preferably made of individual heat dissipation plates, for example 20 cm wide heat dissipation plates.

This preferably U-shaped plate is suspended at its upper end so that it can expand both downward and laterally.

These heat dissipation plates are combined in a suitable manner to form a heat dissipation wall.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a drying device according to the present invention, FIG. 2 is a partial cross-sectional view of the upper part of a second embodiment of the present invention, and FIG. 3 is a combustion chamber similar to that of FIG. 1. FIG. 4 is a partial sectional view of the upper part of another embodiment of the present invention, and FIG. 4 is a route diagram of the conventional device. 1 is a web, 3 is a combustion chamber, 10, 102 is a heat radiation wall, 13
is a waste gas outlet, 405 is a web, 410 is a safety nozzle,
417 is the web exit.

Claims (1)

[Claims for Utility Model Registration] A web drying device that continuously moves by burning a flammable organic liquid carried along with the web,
an outer housing including a combustion chamber with an inlet aperture and an outlet aperture for the web; heating and ignition means disposed adjacent the inlet aperture; and at least one combustion air inlet aperture and a waste gas outlet. In a continuously moving web drying apparatus, the continuously moving web drying apparatus is provided with feeding means for feeding the web substantially vertically (upwardly) through the combustion chamber, comprising: (a)
The combustion chamber 3 is separated by two spaced heat dissipation chambers 10.10H made of a suitable heat dissipation material, and the heat dissipation walls 10.10
(a) divided into a main combustion space 9 surrounded by a and an after-combustion space outside the heat dissipation wall, the web 1 being guided (upwards) through the main combustion space 9; (b) waste gas guidance; The walls 12, 121 are disposed apart from the rear side surfaces (rear surfaces) of the heat dissipation walls 10, 102 on the side opposite to the main combustion space, so that the walls 12, 121 are spaced apart from the rear side surfaces (rear surfaces) of the heat dissipation walls 10, 102 on the side opposite to the main combustion space. forming a flow passage, by means of which the waste gas leaving (rising) the main combustion space 9 is directed into the after-combustion space and into the counter-flow passage in which the above-mentioned (C) in the after-combustion space 11, the waste gas guide wall 12 directed downward; 122 conceals and surrounds the waste gas outlet opening 13 disposed in the lower part of the outer housing;
Therefore, at least a part of the waste gas is absorbed by the heat dissipation wall 10.1.
A continuously moving web drying device, characterized in that the waste gas flows along the rear side (rear side) of 0a towards the waste gas outlet opening 13.