JP3854710B2 - Drying equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drying apparatus for dehumidifying and drying powder particles such as plastic pellets with a dry gas such as dry air.
[0002]
[Prior art]
Conventionally, in the field of plastic molding processing, there has been a drying apparatus that removes wet components in powder particles such as plastic pellets used as a raw material by bringing them into contact with a dry gas such as dry air. Widely used.
[0003]
As shown in FIG. 3, this type of drying apparatus is connected to a drying hopper 1 for receiving and drying powder particles such as plastic pellets, and an upstream side of the drying hopper 1. Are closed by a first drying blower 2 for blowing dry gas and the like, and an adsorption cylinder 3 connected to the downstream side of the drying hopper 1 and for adsorbing wet components in the drying gas that has passed through the drying hopper 1. A dry line is formed. In FIG. 3, on the downstream side of the drying hopper 1 and on the upstream side of the adsorption cylinder 3, a bag filter 5 for removing dust mixed in the drying gas in the drying hopper 1 and the drying gas in order. Are connected to a cooler 6, a line filter 7, a second drying blower 8 for blowing dry gas to the adsorption cylinder 3, and a cooler 9 for cooling the dry gas. A drying heater 10 and a line filter 11 for heating the drying gas are sequentially connected to the downstream side of the first drying blower 2 and the upstream side of the drying hopper 1, respectively.
[0004]
And the dry hopper 1 receives the granular material supplied from the raw material supply hopper 4, and contacts the dry gas blown by the granular material and the 1st dry blower 2 in the dry hopper 1, The wet-drying component contained in the granular material is included in the dry gas to dehumidify and dry the granular material. The dry gas containing the wet component in the dry hopper 1 is then sent to the adsorption cylinder 3, and the wet component is adsorbed and removed in the adsorption cylinder 3 to be dried again, and the first dry blower 2. Then, the air is blown again to the drying hopper 1. In this way, the drying gas is circulated and used in a closed drying line, and efficient drying is performed.
[0005]
Further, the adsorbing cylinder 3 is filled with an adsorbent, and a dry gas is introduced into the adsorption cylinder 3 to remove the wet component adsorbed in the adsorption region 12 and the adsorption region 12 for adsorbing the wet component in the dry gas. For this purpose, it is rotated so as to sequentially pass through the regeneration region 13 into which the heated regeneration gas flows and the cooling region 17 for cooling the heated adsorbent.
[0006]
The regeneration line through which the regeneration gas flowing into the regeneration region 13 flows is connected to the adsorption cylinder 3, the regeneration blower 14 for blowing the regeneration gas to the adsorption cylinder 3, and the upstream side of the adsorption cylinder 3. And a regenerative heater 15 for heating. The regeneration blower 14 is a suction type blower that sucks and sends regeneration gas. In this regeneration line, the regeneration gas heated by the regeneration heater 15 is adsorbed by the adsorption cylinder 3 by sending air to the portion of the adsorption cylinder 3 where the wet component is adsorbed, which is located in the regeneration region 13. The wet components are removed.
[0007]
As the regenerative heater 15, an electric heating type electric heater is normally used, and a heat exchanger 16 is connected to each of the upstream line of the regenerative heater 15 and the downstream line of the adsorption cylinder 3. Then, the regeneration gas before flowing into the regeneration heater 15 receives heat from the regeneration gas having a high temperature discharged from the adsorption cylinder 3 in the heat exchanger 16 and is preheated so that the regeneration heater 15 is heated. Heating is reduced in order to reduce electricity consumption.
[0008]
[Problems to be solved by the invention]
However, today, where the cost of the plastic molded product is required to be reduced, it is required to reduce the running cost of the peripheral equipment used for the production.
However, if the regenerative heater used in the drying apparatus is an electric heater, the amount of electricity consumed is large, and it is difficult to reduce the running cost. On the other hand, if a gas heater that heats by burning fuel gas is used as a regenerative heater, the cost can be reduced as compared with an electric heater, but it is still insufficient to reduce the cost required today. Is hard to say.
[0009]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a drying apparatus capable of greatly reducing running costs.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 includes a dryer for drying a granular material, a drying-side blowing means for blowing a drying gas to the drying device, and a downstream side of the drying device. The regeneration gas is blown to the drying line, the adsorber, and the portion where the wet component in the adsorber is adsorbed, which is formed by an adsorber that adsorbs the wet component in the dry gas that has been connected and passed through the dryer. In the drying apparatus, comprising: a regeneration side blowing means for regenerating, and a regeneration line connected to the upstream side of the adsorber and formed by a regeneration heater for heating the regeneration gas blown to the adsorber The regenerative heater includes a regenerative gas passage through which the regenerative gas passes, and a heating unit that burns fuel gas in order to heat the regenerative gas that passes through the regenerative gas passage. In order to use the generated combustion gas as a regeneration gas, an inflow means is provided for causing at least a part of the combustion gas discharged from the discharge port of the heating unit to flow as an regeneration gas into the inlet of the regeneration gas passage. The regeneration line includes a regeneration gas introduction pipe for sending the regeneration gas flowing in from the inflow means to the regeneration gas passage, a discharge pipe connected to the downstream side of the adsorber, and an exhaust from the adsorber. A heat exchanger for exchanging heat between the regenerated gas to be regenerated and the regenerated gas flowing in from the inflow means, wherein one of the heat exchangers is connected to the exhaust pipe and the other is It is connected to the regeneration gas introduction pipe .
[0011]
According to such a configuration, the regeneration heater of the regeneration line is a gas heater having a heating section for burning fuel gas, so that its running cost is lower than that of an electric heater and is further combusted in the heating section by the inflow means. At least a part of the combustion gas that has flown into the regeneration gas passage is introduced as regeneration gas into the regeneration gas passage, so that the regeneration gas entering the regeneration gas passage of the regeneration heater originally has a high temperature and is heated by the regeneration heater so much. I don't need it. Therefore, the regeneration gas can be efficiently heated, and the running cost can be greatly reduced as compared with the case where an electric heater is used.
In addition, with such a heat exchanger, the regeneration gas flowing in from the inflow means can receive heat from the regeneration gas having a higher temperature discharged from the adsorber. Therefore, the temperature of the regeneration gas before being heated by the regeneration heater can be increased in advance by this heat exchanger, and heating by the regeneration heater can be further reduced.
[0012]
The invention according to claim 2 is the invention according to claim 1, wherein, in the regeneration line, the regeneration gas passage is disposed downstream of the heating unit, and the regeneration gas passage is disposed downstream of the regeneration gas passage. An adsorber is provided.
By arranging the regeneration line in this way, at least a part of the combustion gas combusted in the heating unit flows into the regeneration gas passage as it is, and after being heated by the heating unit in the regeneration gas passage, Can flow in. Therefore, regeneration gas can be sent efficiently and the thermal efficiency of the regeneration line can be improved.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Figure 1 is an apparatus configuration diagram showing an embodiment of Drying device. This drying apparatus is mainly a drying apparatus for dehumidifying and drying powder particles such as plastic pellets.
In FIG. 1, this drying device 21 sequentially has a bag filter 23, a second cooler 24, a second line filter 25, a second filter downstream of a drying hopper 22 as a dryer for dehumidifying and drying the granular material. A drying blower 26, a first cooler 27, an adsorption cylinder 28 as an adsorber, a first drying blower 29 as a drying side blowing means, a drying heater 30, and a first line filter 31 are disposed. The closed drying line 32 is formed by being connected by the drying line connecting pipe 54.
[0016]
A dry gas such as dry air is passed through the closed drying line 32, and wet components in the granular material supplied from the raw material supply hopper 33 into the dry hopper 22 are removed by the dry gas. is doing. That is, the drying gas blown by the first drying blower 29 is heated by the drying heater 30, dust is removed by the first line filter 31, and then flows into the drying hopper 22.
[0017]
The tip of the drying line connecting pipe 54 inserted into the drying hopper 22 has a discharge port 34 that is wide open in the lower part of the drying hopper 22, and the drying gas flows into the drying hopper 22 from the discharge port 34. Is done. On the other hand, the powder supplied from the raw material supply hopper 33 connected to the upper side of the drying hopper 22 falls in the drying hopper 22, but the dry gas introduced from the discharge port 34 is dropped into the falling powder. And is sent out again to the drying line 32 from above the drying hopper 22 while entraining or absorbing wet components in the granular material.
[0018]
The granular material supplied from the raw material supply hopper 33 is removed from the discharge port 35 provided at the bottom of the dry hopper 22 after the wet components are removed by the dry gas in the dry hopper 22. Sent to.
The dry gas flowing out of the dry hopper 22 and containing the wet component flows into the bag filter 23, and after the dust mixed in the dry gas is removed in the dry hopper 22, it is sent to the second cooler 24. The temperature raised in the hopper 22 is lowered. Then, after flowing into the second line filter 25 and further removing dust, the dust is sent to the second dry blower 26 and blown to the adsorption cylinder 28 by the second dry blower 26. The dry gas flowing out from the second dry blower 26 flows into the first cooler 27 before flowing into the adsorption cylinder 28 and is cooled again to facilitate the removal of the wet components. The drying gas that has flowed into the adsorption cylinder 28 is removed from the wet components in the drying gas by the adsorption cylinder 28, becomes usable again as the drying gas, and is sent out again to the drying line connection pipe 54. Then, it again flows into the first drying blower 29 and is blown to the drying hopper 22. In this way, the drying gas is circulated and used in the closed drying line 32. The first and second drying blowers 29 and 26 used in the closed drying line 32 are suction type blowers.
[0019]
Further, the adsorption cylinder 28 has a substantially cylindrical shape, and a plurality of filling tubes 36 extending in the axial direction filled with the adsorbent are arranged in the circumferential direction, and the center of the adsorption cylinder 28 is used as an axis. A plurality of filling pipes 36 are moved in the circumferential direction by being rotated by a drive shaft (not shown). The adsorption cylinder 28 is connected to a drying line 32 and is connected to an adsorption region 37 for adsorbing a wet component contained in the dry gas and a regeneration line 39 described later to regenerate the adsorbent that has adsorbed the wet component. And a cooling line connecting pipe 56 to be described later are connected and rotated so as to sequentially pass through a cooling area 55 for cooling the adsorbent heated in the regeneration area 38. By the rotation of the adsorption cylinder 28, the adsorption cylinder 37, the regeneration area 38, and the cooling area 55 are sequentially passed and circulated.
[0020]
In the adsorption region 37, drying line connection pipes 54 are connected to the upstream side and the downstream side of the adsorption cylinder 28 so that the dry gas flows along the axial direction in the filling pipe 36 positioned in the adsorption region 37. Similarly, in the regeneration region 38, regeneration line connection pipes described later are respectively provided upstream and downstream of the adsorption cylinder 28 so that a regeneration gas described later flows in the filling pipe 36 along the axial direction thereof. 47 is connected. Further, the cooling region 55 is also connected to cooling lines to be described later on the upstream side and the downstream side of the adsorption cylinder 28 so that a cooling gas to be described later flows in the filling pipe 36 along the axial direction thereof. A tube 56 is connected.
[0021]
Then, in the adsorption region 37, a dry gas containing a wet component flows in, and the inflowed dry gas flows in the filling pipe 36 positioned in the adsorption region 37 at that time and is filled in the filling tube 36. The wet component is adsorbed by the adsorbent and dried again. On the other hand, the filling tube 36 that has adsorbed the wet component in the adsorption region 37 is then moved to the regeneration region 38 by the rotation of the adsorption cylinder 28. In the regeneration region 38, the heated regeneration gas flows into the filling tube 36 containing the wet component. The regeneration gas flows in the filling pipe 36 along the axial direction thereof, absorbs or entrains the wet component contained in the adsorbent, and is discharged from the adsorption cylinder 28. Thereby, the wet component is removed from the adsorbent. The filling tube 36 from which the wet component has been removed is moved to the cooling region 55 by the rotation of the adsorption cylinder 28. In the cooling region 55, the regeneration gas before being heated flows in as a cooling gas, and cools the adsorbent in the filling pipe 36 heated in the regeneration region 38. Then, the filling tube 36 cooled in the cooling region 55 is moved again to the adsorption region 37 by the rotation of the adsorption cylinder 28, and is used for removing the wet component in the dry gas.
[0022]
In this way, the adsorbent filled in each filling pipe 36 of the adsorption cylinder 28 adsorbs the wet component from the dry gas in the adsorption region 37, and then the adsorbed wet component is removed in the regeneration region 38. Further, by being cooled in the cooling region 55, it is repeatedly circulated and used.
In the present embodiment, the regeneration line 39 for blowing the regeneration gas heated to the regeneration region 38 is configured as follows.
[0023]
That is, in FIG. 1, the regeneration line 39 is connected to the adsorption cylinder 28, the regeneration blower 41 as a regeneration side blowing means for blowing regeneration gas to the regeneration region 38 of the adsorption cylinder 28, and the upstream side of the adsorption cylinder 28. And a regeneration heater 40 for heating the regeneration gas blown to the adsorption cylinder 28.
A so-called gas heater is used as the regeneration heater 40, and a regeneration gas passage 42 through which the regeneration gas passes, and a heating unit that burns and heats the fuel gas to heat the regeneration gas that passes through the regeneration gas passage 42. 43. In addition, combustible butane gas, propane gas, city gas, etc. are used as fuel gas.
[0024]
The fuel gas sent from the gas supply source 44 to the regeneration heater 40 flows from the supply port 53 of the regeneration heater 40 and is combusted in the heating unit 43. Next, the burned combustion gas flows out from the discharge port 45, and then at least a part thereof is introduced into the regeneration line 39. That is, in the regeneration line 39, the collecting pipe 57 as the inflow means, the regeneration line filter 46, the regeneration blower 41, the regeneration gas passage 42 of the regeneration heater 40, and the adsorption cylinder 28 are sequentially arranged downstream of the discharge port 45. These parts are connected by a regeneration line connecting pipe 47. The collecting pipe 57 has a funnel-like shape, is disposed at a predetermined interval from the discharge port 45 of the heating unit 43, and the combustion gas flowing out from the discharge port 45 is mixed together with outside air (air). In this state, it can be taken into the reproduction line 39. And the combustion gas which flowed out from the discharge port 45 flows in into the regeneration line 39 with the outside air via the collecting pipe 57, and at least a part thereof is used as the regeneration gas. Note that the combustion gas flowing into the collecting pipe 57 may be all or part of the combustion gas flowing out from the discharge port 45, and it is sufficient that at least a part of the regeneration gas contains the combustion gas. . The regeneration gas introduced from the collecting pipe 57 is sent to the regeneration gas passage 42 of the regeneration heater 40 by the regeneration blower 41 after dust is removed by the regeneration line filter 46. The regeneration gas that has flowed into the regeneration gas passage 42 from the inlet 51 of the regeneration gas passage 42 is heated by the heat from the heating unit 43 while passing through the regeneration gas passage 42, and then flows out from the outlet 52. Then, it is sent to the regeneration region 38 of the adsorption cylinder 28 and absorbs or entrains the wet component well from the adsorbent containing the wet component, and then from the regeneration line connection pipe 47 connected above the adsorption cylinder 28, Released into the atmosphere.
[0025]
Note that, on the upstream side of the regeneration heater 40 in the regeneration line 39, the cooling line connection tube 56 is branched from the regeneration line connection tube 47, and the cooling line connection tube 56 is caused to flow into the cooling region 55. The regeneration gas before being heated flows into the cooling region 55 as a cooling gas.
According to such a configuration, since the regenerative heater 40 is a gas heater, its running cost is lower than that of an electric heater, and the combustion gas combusted in the heating unit 43 enters the regeneration line 39 together with outside air from the collecting pipe 57. Since at least a part of the combustion gas introduced, that is, combusted in the heating unit 43, is used as it is as the regeneration gas, the regeneration gas that enters the regeneration gas passage 42 of the regeneration heater 40 originally has a high temperature, and the regeneration heater. 40 does not require much heating. Therefore, the regeneration gas can be efficiently heated, and the running cost can be greatly reduced as compared with the case where an electric heater is used.
[0026]
Further, the regeneration line 39 is combusted in the heating unit 43 because the regeneration gas passage 42 is disposed on the downstream side of the heating unit 43 and the adsorption cylinder 28 is disposed on the downstream side of the regeneration gas passage 42. The regeneration gas containing the combustion gas can be directly introduced into the regeneration gas passage 42, heated in the regeneration gas passage 42 by the heating unit 43, and then introduced into the adsorption cylinder 28. Therefore, the regeneration gas can be sent efficiently, and the regeneration line 39 can be formed as a heat efficient line. Therefore, the running cost can be further reduced.
[0027]
Next, an embodiment of the drying apparatus of the present invention will be described. FIG. 2 shows an embodiment of the drying apparatus of the present invention in which a heat exchanger 48 is connected to the regeneration line 39. That is, the collecting pipe 57 and the inlet 51 of the regeneration gas passage 42 are connected by a regeneration gas introduction pipe 49 that is one of the regeneration line connection pipes 47. In the regeneration gas introduction pipe 49, a regeneration line filter 46 is connected to the downstream side of the heating unit 43, and a heat exchanger 48 is connected to the downstream side thereof. A discharge pipe 50 that is one of the regeneration line connection pipes 47 is connected to the downstream side of the adsorption cylinder 28. In the exhaust pipe 50, a heat exchanger 48 connected to a regeneration gas introduction pipe 49 is connected to the downstream side of the adsorption cylinder 28, and a regeneration blower 41 is connected to the downstream side thereof. The regeneration blower 41 used in FIG. 2 is a suction type blower, and the regeneration gas is sucked and sent to the suction type regeneration blower 41. Further, on the upstream side of the heat exchanger 48 in the regeneration line 39, the cooling line connection pipe 56 is branched from the regeneration gas introduction pipe 49, and this cooling line connection pipe 56 is caused to flow into the cooling region 55. The regeneration gas before being heated flows into the cooling region 55 as a cooling gas, and is connected to the discharge pipe 50 on the upstream side of the cooling region 55.
[0028]
In such a regeneration line 39, the combustion gas burned in the heating unit 43 in the regeneration heater 40 flows into the regeneration gas introduction pipe 49 of the regeneration line 39 together with outside air from the collecting pipe 57, and this regeneration gas introduction pipe 49. Then, the dust is removed and sent to the heat exchanger 48. In the heat exchanger 48, the regeneration gas containing the combustion gas receives heat from the regeneration gas having a high temperature discharged from the adsorption cylinder 28, and its temperature is raised. Next, it is sent to the regeneration gas passage 42 of the regeneration heater 40. The regeneration gas sent to the regeneration gas passage 42 of the regeneration heater 40 is heated by the heat from the heating unit 43, and then sent to the regeneration region 39 of the adsorption cylinder 28. The wet component is absorbed or entrained, and then sent to the discharge pipe 50 connected to the downstream side of the adsorption cylinder 28. The regeneration gas sent to the discharge pipe 50 flows into the heat exchanger 48, in which heat is applied to the combustion gas that has flowed into the regeneration gas introduction pipe 49 and then sent to the regeneration blower 41. And released into the atmosphere.
[0029]
According to such a configuration, the regeneration gas including the combustion gas flowing in from the collecting pipe 57 is discharged from the adsorption cylinder 28 by the heat exchanger 48 connected to the regeneration gas introduction pipe 49 and the exhaust pipe 50. It can receive heat from the hot regeneration gas. Therefore, since the temperature of the regeneration gas before being heated by the regeneration heater 40 can be increased in advance, the heating by the regeneration heater 40 can be further reduced. Therefore, the running cost can be further reduced.
[0030]
In FIG. 2, the drying line 32 has the same configuration as that of the embodiment shown in FIG. 1, and the same reference numerals as those in FIG. 1 are used in FIG. 2. Also, the drying heater 30 of the drying line 32 used in FIGS. 1 and 2 uses a gas heater in the same manner as the regenerative heater 40, thereby reducing the cost.
In the present invention, the first drying blower 29, the second drying blower 26, and the regeneration blower 41 may be either a pressure feed type or a suction type, and gas is supplied into the drying line 32 and the regeneration line 39. If the air can be blown, the connecting position is not limited. In addition, in the closed drying line 32, two blowers of the first dry blower 29 and the second dry blower 26 are used, but one blower may be used, and the first cooler 27 and the second cooler 24 are either There may be only one of them, and the first cooler 27 and the second cooler 24 may not be used.
[0031]
Further, the combustion gas discharged from the discharge port 45 of the heater 40 was caused to flow into the regeneration line 39 together with the outside air through the collecting pipe 57. As an inflow means, the combustion gas discharged from the discharge port 45 was used as the regeneration line. Other known means may be used as long as it can flow into the air inlet 39. For example, the discharge port 45 and the regeneration line 39 may be connected by a connecting pipe, and the outside air may be taken in from a suction pipe provided separately. Moreover, it is not always necessary to take in the outside air, and the discharge port 45 and the regeneration line 39 may be simply connected by a connecting pipe. Furthermore, an appropriate hole may be provided in the connecting pipe that connects the discharge port 45 and the regeneration line 39 so that outside air flows in along with the combustion gas.
[0032]
【The invention's effect】
As described above, according to the first aspect of the present invention, at least a part of the high-temperature combustion gas burned in the heating section is used as it is as the regeneration gas. When heating, not much heating is required. Therefore, the regeneration gas heated efficiently can be used, and the running cost of the drying apparatus can be greatly reduced.
Moreover, the temperature of the regeneration gas before being heated by the regeneration heater can be increased in advance by the heat exchanger. Therefore, the heating by the regenerative heater can be further reduced, and the running cost can be further reduced.
[0033]
According to the second aspect of the present invention, since a heat efficient regeneration line can be formed, the running cost can be further reduced .
[Brief description of the drawings]
1 is a system configuration diagram showing an embodiment of Drying device.
Figure 2 shows an embodiment of the drying apparatus of the present invention is an apparatus configuration diagram showing a drying device connected heat exchanger reproduction line of the drying device shown in FIG.
FIG. 3 is an apparatus configuration diagram showing a conventional drying apparatus.

Claims (2)

A dryer for drying the granular material, a drying-side blowing means for blowing a drying gas to the drying device, and a wet component in the drying gas that is connected to the downstream side of the drying device and passes through the drying device A drying line formed by an adsorber that
The adsorber, a regeneration side blowing means for blowing regeneration gas to a portion of the adsorber where the wet component is adsorbed, and the regeneration gas connected to the upstream side of the adsorber and heated to the adsorber A drying apparatus comprising a regeneration line formed by a regeneration heater for
The regeneration heater includes a regeneration gas passage through which regeneration gas passes, and a heating unit that burns fuel gas to heat the regeneration gas that passes through the regeneration gas passage,
In order to use the combustion gas burned in the heating unit as a regeneration gas, at least a part of the combustion gas discharged from the discharge port of the heating unit flows into the inlet of the regeneration gas passage as a regeneration gas. Inflow means are provided ,
The regeneration line is exhausted from a regeneration gas introduction pipe for sending regeneration gas flowing in from the inflow means to the regeneration gas passage, a discharge pipe connected downstream of the adsorber, and the adsorber. A heat exchanger for exchanging heat between the regeneration gas and the regeneration gas introduced from the inflow means,
One of the heat exchangers is connected to the exhaust pipe, and the other is connected to the regeneration gas introduction pipe .   2. The regeneration line according to claim 1, wherein in the regeneration line, the regeneration gas passage is disposed downstream of the heating unit, and the adsorber is disposed downstream of the regeneration gas passage. Drying equipment.

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