JPH11291454A - Drier of printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drier of a printing machine which enables effective utilization of a surplus heat quantity of high-temperature gas after deodorization. SOLUTION: Exhaust gas produced by drying the ink of a printed matter (printed paper) in a drier main body 1 is deodorized by passing it through a deodorizing device 5 of a combustion type and discharged into the air. In this case, a heat storage body (heat storage means) 13 is provided at a position where high-temperature gas discharged from the deodorizing device 5 passes and the heat of the high-temperature gas discharged from the deodorizing device 5 in a drying operation is stored in the heat storage body 13, while the heat stored in the heat storage body 13 in a warming-up operation between the drying operations is released into the deodorizing device 5. Thereby a surplus heat quantity of the high-temperature gas after deodorization is utilized effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dryer for a printing press such as a commercial offset rotary press.

[0002]

2. Description of the Related Art As a dryer for a printing press of this kind, for example, a dryer for a commercial offset rotary press having a direct combustion type deodorizing device 5 as shown in FIG. 3 is known. That is, the ink on the printing paper (printed matter) in the dryer main body 1 is dried by hot air. The exhaust gas is guided by the exhaust fan 2 through the pipe 3 to the high-temperature heat exchanger 4, preheated by the high-temperature heat exchanger 4, and then enters the deodorizer 5. Here, the exhaust gas is burned at 700 to 800 ° C. by the burner 6 and, after deodorizing, enters the high-temperature heat exchanger 4 again, after heat exchange, passes through the pipe 7, and a part of the hot air to the dryer body 1. In order to use it as a heat source for supply, it passes through the low-temperature heat exchanger 8, and the rest passes by-passing the low-temperature heat exchanger 8, and finally merges with the gas that has passed through the low-temperature heat exchanger 8, and passes through the stack to the atmosphere Is discharged to

In FIG. 3, a burner 22 is located downstream of the low-temperature heat exchanger 8 and heats drying air supplied to the dryer body 1. The burner 22 and the above-described burner 6 are supplied from a combustion air supply source 23 to a supply line 24.
, And air is supplied from a fuel supply source 25 via a supply line 26. The hot air heated by the hot air supply fan 21 via the low-temperature heat exchanger 8 and the burner 22 is supplied to the dryer body 1. Further, the gas in the dryer main body 1 is circulated by another hot air supply fan 21.

In the dryer of this commercial offset rotary press, since the direct-burning type deodorizing device 5 is used, there is no problem such as catalyst poisoning, which is a concern when a catalytic type is used, for example. However, on the other hand, since the absolute temperature in the deodorizing device 5 is high, a large amount of heat is generated particularly during normal operation for drying. That is,
The gas that has become high temperature after deodorization has a considerable amount of heat with respect to the heat supply required in the high-temperature heat exchanger 4 and the low-temperature heat exchanger 8, and a part of the gas that is unnecessary is converted into a low-temperature heat exchanger. 8
Is being released directly to the atmosphere by bypassing the air.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and provides a dryer for a printing press capable of effectively utilizing the excess heat of a high-temperature gas after deodorization. The challenge is to do.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a method in which exhaust gas obtained by drying ink on a printed material by a dryer body is deodorized through a combustion type deodorizer and then discharged to the atmosphere. Wherein the heat storage means is provided at a position where the high-temperature gas discharged from the deodorizing device passes, and the heat of the high-temperature gas discharged from the deodorizing device during the drying operation is supplied to the heat storing device. In addition to storing the heat, the heat stored in the heat storage means is released to the deodorizing device during a warm-up operation during the drying operation.

[0007]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. However, components common to the components shown in the conventional example are denoted by the same reference numerals, and description thereof will be simplified.

As shown in FIG. 1, a dryer of a commercial offset rotary press shown in this embodiment deodorizes an exhaust gas obtained by drying ink of a printed matter by a dryer body 1 through a combustion type deodorizer 5. A heat storage body (heat storage means) 13 is provided at a position where high-temperature gas discharged from the deodorizing device 5 passes, and is configured to be discharged to the atmosphere;
The heat storage unit 13 stores the heat of the high-temperature gas discharged from the deodorizing device 5 during the drying operation, and releases the heat stored in the heat storage unit 13 to the deodorizing device 5 during the warm-up operation during the drying operation. It is characterized by:

Hereinafter, the above configuration will be described in more detail. That is, FIG. 1 shows an overall schematic view of a dryer of a commercial offset rotary press as one embodiment of the present invention, and FIG. The heat storage unit 13 is provided on a pipe 71 branched from the pipe 7 after exiting the high-temperature heat exchanger 4 provided on the downstream side of the deodorizing device 5. This pipe 71 discharges to the atmosphere without passing through the low-temperature heat exchanger 8. In other words, the heat storage unit 13 is configured to store the heat of the high-temperature gas that has passed through the high-temperature heat exchanger 4 and does not pass through the low-temperature heat exchanger 8 and that is conventionally discharged to the atmosphere without any use. To store heat.

As shown in FIG. 2, for example, the heat storage body 13 is formed by stacking heat storage materials 14 made of bricks or the like in a layer in a housing 140 having heat insulation. Each heat storage material 14 is formed in the shape of a rod having a square cross section. A plurality of the heat storage materials 14 are arranged at predetermined intervals in each layer, and are stacked so as to change the direction in the 90-degree direction for each layer.

A pipe 31 branches off from the pipe 3 on the downstream side of the exhaust fan 2. The pipe 31 is provided with a control valve 11. The pipe 31 is a heat storage element 1
And a pipe 10 for supplying exhaust gas supplied from the pipe 31 to the heat storage body 13 to the deodorizer 5.
Is connected. On the other hand, the pipe 3 is provided with a control valve 12 at a position downstream of the branch of the pipe 31. This control valve 12 is provided on the upstream side of the high-temperature heat exchanger 4 in the pipe 3.

However, the control valve 12 may be provided anywhere on the upstream side of the deodorizing device 5 as long as it is downstream of the branch of the pipe 31. Similarly, the control valve 1 described above
1 may also be provided at the position of the pipe 10. However, in order to reduce the probability of gas leakage from each of the pipes 3, 31, 10, each of the control valves 11, 12 is provided near the branch of the pipe 31 from the pipe 3 and at the branch of the pipe 3. It is preferable to provide it on the downstream side and in the vicinity of the branch. Further, the specifications (materials, shapes, dimensions, arrangements, installation locations, etc.) of the heat storage unit 13 and the specifications of the control valves 11 and 12 are not limited to those described in this embodiment, but may be various. Can be used.

Next, the operation and effect of the dryer of the commercial offset rotary press configured as described above will be described. First, during normal operation for drying the printing paper, an exhaust gas containing a solvent exhausted from the dryer main body 1 is guided from the exhaust fan 2 to the high-temperature heat exchanger 4 through the pipe 3. At this time, the control valve 11 is closed and the control valve 12 is open. The exhaust gas is exhausted by the burner 6 in the
It burns at 0-800 ° C. and then becomes a high-temperature gas of about 550 ° C. through the high-temperature heat exchanger 4, branches off in the middle of the pipe 7 by adjusting a damper (not shown), and a part thereof is subjected to low-temperature heat exchange. It flows into the vessel 8 and the remainder flows into the pipe 71.

The high-temperature gas flowing into the low-temperature heat exchanger 8 gives heat to the air blown by the hot-air supply fan 21 so as to supply hot air to the dryer main body 1, and then is discharged from the chimney. On the other hand, the high-temperature gas flowing through the pipe 71 supplies heat to the heat storage unit 13 via the heat storage unit 13 and finally merges with the gas passed through the low-temperature heat exchanger 8 and is discharged from the chimney. You. The heat storage 13 stores the amount of heat that has been exhausted.

The heat storage body 13 may have various structures. In this embodiment, as an example, a heat storage material 14 made of bricks is stacked as described above. As shown in FIG. 2, in the heat storage body 13, a high-temperature gas flows in a direction indicated by an arrow 15, for example. The high-temperature gas flows through the gaps between the heat storage materials 14, radiates heat to the respective heat storage materials 14, and then goes out of the system.
As described above, there is provided a means for storing heat, which has been conventionally discarded as surplus, for effective use.

Next, utilization of the stored heat will be described.
That is, when the normal operation for drying is completed, the control valve 12 is closed and the control valve 11 is opened. For this reason, the exhaust gas sucked by the exhaust fan 2 is
Does not flow into the high-temperature heat exchanger 4 but flows into the heat storage body 13 via the pipe 31.

At this time, in the heat storage body 13, as shown in FIG. 2, the exhaust gas passes between the heat storage materials 14 in the direction of the arrow 16. The high-temperature gas 55 is stored in the heat storage body 13 during normal operation.
Since the heat is already stored at the level of 0 ° C., the passing exhaust gas (temperature level of about 100 ° C.) is supplied with heat from the heat storage unit 13, becomes a gas of about 500 ° C., exits the heat storage unit 13, and is connected to the pipe. It is supplied to the deodorizing device 5 via 10.

Conventionally, when the drying operation is stopped such as when changing the plate, the inside of the deodorizing device 5 must be constantly maintained at 500 ° C. for a quick start after the stop, and as is apparent from FIG. 100 withdrawn from inside the dryer body 1
In order to prevent the temperature from being lowered by the exhaust gas at a low temperature of the order of ° C., the burner 6 is bothersome and wasteful fuel for maintaining the temperature is consumed.

However, in this embodiment, the surplus heat amount during the drying operation can be effectively used as a heat amount for preventing the temperature of the deodorizing device 5 from decreasing when the drying operation is stopped. Therefore, the energy saving effect is very large. According to a rough calculation, the amount of heat required to maintain the temperature in the deodorizing device 5 at 500 ° C. for 30 minutes during the plate change warm-up is obtained by normal operation during drying for about 15 minutes. The amount of heat supplied to the heater can be sufficiently satisfied. That is, in daily work in which the normal operation at the time of drying and the warming-up operation at the time of plate change are repeated, the deodorizing device 5 can be sufficiently warmed up by the amount of heat stored in the heat storage body 13. If the amount of heat is insufficient, the burner 6 may be used as an auxiliary.

As described above, according to this embodiment,
The amount of heat that has been excessively discharged until now can be effectively used to maintain the temperature in the deodorizing device 5 when the operation is stopped, and significant fuel savings can be achieved.

[0021]

According to the present invention, the excess heat generated in the combustion type deodorizing device is stored in the heat storage means, and the heat stored in the heat storage means is released to the deodorizing device during the warm-up operation during the drying operation. With such a configuration, the excess heat of the high-temperature gas after deodorization can be effectively used. Therefore, the fuel used in the deodorizing device can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall schematic view of a dryer of a commercial offset rotary press shown as one embodiment of a dryer of a printing press of the present invention.

FIG. 2 is a fragmentary perspective view showing a heat storage body of a dryer of the commercial offset rotary press.

FIG. 3 is an overall schematic view of a dryer of a commercial offset rotary press shown as a dryer of a conventional printing press.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dryer main body 5 Deodorizer 13 Heat storage body (heat storage means)

Claims (1)

[Claims] 1. A dryer for a printing press, wherein exhaust gas obtained by drying ink of a printed matter in a dryer main body is deodorized through a combustion type deodorizing device and then discharged to the atmosphere, wherein the exhaust gas is discharged from the deodorizing device. A heat storage means is provided at a passage position of the hot gas to be discharged, and the heat of the high temperature gas discharged from the deodorizing device during the drying operation is stored in the heat storage means, and is stored in the heat storage means during the warm-up operation during the drying operation. A dryer for a printing press, wherein the dryer is configured to discharge the generated heat to a deodorizing device.