CN116714137A

CN116714137A - Powder processing apparatus, powder processing method, and gas processing apparatus

Info

Publication number: CN116714137A
Application number: CN202310199033.2A
Authority: CN
Inventors: 长谷川和希; 大堀进一; 大岛英范
Original assignee: Kawata Manufacturing Co Ltd
Current assignee: Kawata Manufacturing Co Ltd
Priority date: 2021-03-05
Filing date: 2023-03-03
Publication date: 2023-09-08
Also published as: JP2022136063A

Abstract

The invention provides a powder processing device, a powder processing method and a gas processing device, which can inhibit environmental deterioration caused by exhaust from a gas pipeline except a drying pipeline. The heated and dehumidified drying gas is supplied to the drying hopper (11), whereby the powder particles contained in the drying hopper (11) are dried. In an adsorption unit (18) for dehumidifying a dry gas, a drying region in which moisture contained in the dry gas is adsorbed by an adsorption material of an adsorption cylinder (24) is set, and a regeneration region in which moisture is deprived from the adsorption material by the regeneration gas, thereby regenerating the adsorption material. The regeneration gas deprived of moisture from the adsorption material is deodorized by a deodorizing device (91) and then exhausted to the outside air.

Description

Powder processing apparatus, powder processing method, and gas processing apparatus

Technical Field

The present invention relates to an apparatus and a method for treating a powder or granular material such as a resin material, and a gas treatment apparatus.

Background

For example, in a process for producing a plastic product, preliminary drying for removing moisture from a plastic material is performed before the plastic material is fed into a molding machine.

In many cases, various additives such as ultraviolet screening agents and flame retardants are blended with plastic materials. Among the additives are additives containing VOC (Vo l at i l e Organ i c Compounds: volatile organic compound), and if the additives containing VOC are mixed into a plastic material, VOC volatilizes from the plastic material in a preliminary drying process. Volatile components such as VOC not only emit odor, but also precipitate and adhere to the inside of the pipe through which they pass, thereby contaminating the inside of the pipe.

For this reason, there has been proposed a configuration in which a deodorizing device is provided in a drying line through which air deprived of moisture from a plastic material flows, and an odor component such as VOC contained in the air is removed by the deodorizing device (for example, refer to patent document 1).

Prior art literature

Patent literature

Patent document 1: japanese patent No. 6068969

Disclosure of Invention

Technical problem to be solved by the invention

However, in a device including a gas line through which a gas flows in addition to a dry line, there is a concern that the environment of a factory in which such a device is installed may be deteriorated by many devices directly discharging exhaust gas from the gas line other than the dry line to the outside air as it is.

The purpose of the present invention is to provide a powder processing apparatus, a powder processing method, and a gas processing apparatus, which can prevent contamination of a dry line and can suppress environmental deterioration caused by exhaust gas from a gas line other than the dry line.

Solution to the above technical problems

In order to achieve the above object, a powder processing apparatus according to an aspect of the present invention includes: a drying line through which a drying gas flows; a regeneration line through which a regeneration gas flows; a receiving portion provided in the drying line for receiving the powder; a heating unit for heating the drying gas flowing through the drying line to the accommodating unit; an adsorption unit configured to have a drying region through which the drying gas flowing through the drying line to the storage unit passes and a regeneration region through which the regeneration gas flowing through the regeneration line passes, and to adsorb moisture contained in the drying gas passing through the drying region to the adsorbent, and to regenerate the adsorbent by depriving the adsorbent of moisture from the regeneration gas in the regeneration region; and a gas treatment unit connected to the downstream end of the regeneration line, for decomposing the regeneration gas from the regeneration line and discharging the decomposed regeneration gas.

According to this configuration, the powder and granular material stored in the storage portion is dried by supplying the heated and dehumidified drying gas to the storage portion. The adsorption unit is provided with a drying region in which moisture contained in the drying gas is adsorbed by the adsorbent to dehumidify the drying gas, and a regeneration region in which moisture is deprived from the adsorbent by the regeneration gas to regenerate the adsorbent. At this time, the odor component is also adsorbed and desorbed by the adsorbent, so at least a part moves from the drying line to the regeneration line. The regeneration gas deprived of moisture and odor components from the adsorbent is exhausted after the decomposition treatment. Therefore, the organic components of the drying line can be effectively removed, and the environmental deterioration caused by the exhaust gas from the regeneration line through which the regeneration gas flows can be suppressed.

In the adsorption section, as the adsorption material, a moisture adsorption material that adsorbs moisture contained in the dry gas and an adsorption material for other components other than moisture contained in the dry gas may be used in combination.

Another aspect of the present invention provides a powder processing apparatus comprising: a drying line through which a drying gas flows; a regeneration line through which a regeneration gas flows; a receiving portion provided in the drying line for receiving the powder; a heating unit for heating the drying gas flowing through the drying line to the accommodating unit; an adsorption unit in which a drying region through which a drying gas flowing through a drying line to a storage unit passes and a regeneration region through which a regeneration gas flowing through a regeneration line passes are set in a cylindrical adsorption cylinder, the adsorption unit comprising a hydrophilic adsorbent and a hydrophobic adsorbent arranged in the direction of the center line of the adsorption cylinder, wherein moisture contained in the drying gas is adsorbed to the hydrophilic adsorbent in the drying region, organic components contained in the drying gas are adsorbed to the hydrophobic adsorbent, and wherein moisture is deprived from the hydrophilic adsorbent by the regeneration gas in the regeneration region, the hydrophilic adsorbent is regenerated, and organic components are deprived from the hydrophobic adsorbent by the regeneration gas, so that the hydrophobic adsorbent is regenerated; and a gas treatment unit connected to the regeneration line and configured to decompose the regeneration gas from the regeneration line and to discharge the decomposed regeneration gas.

According to this configuration, the powder and granular material stored in the storage portion is dried by supplying the heated and dehumidified drying gas to the storage portion. The adsorption unit is provided with a drying region in which moisture contained in the drying gas is adsorbed by the hydrophilic adsorbent to dehumidify the drying gas, and a regeneration region in which moisture is deprived from the hydrophilic adsorbent by the regeneration gas to regenerate the hydrophilic adsorbent. In addition, the organic component contained in the drying gas is adsorbed by the hydrophobic adsorbent in the drying region, and the organic component is stripped from the hydrophobic adsorbent by the regeneration gas in the regeneration region, whereby the hydrophobic adsorbent is regenerated. The regeneration gas deprived of the organic component (odor component) from the hydrophobic adsorbent is exhausted after the decomposition treatment. Therefore, the organic components of the drying line can be effectively removed, and the environmental deterioration caused by the exhaust gas from the regeneration line through which the regeneration gas flows can be suppressed.

The hydrophobic adsorbent and the hydrophilic adsorbent may be a honeycomb structure composed of zeolite.

The decomposition treatment may be a treatment by a catalyst decomposition method using a low-temperature catalyst (low-temperature deodorization catalyst).

This can suppress the treatment temperature to a low temperature of 200 to 400 ℃, thereby saving energy.

The powder and granular material treatment apparatus may further include a regeneration heater provided on an upstream side of the dehumidifying section in the regeneration line and configured to heat the regeneration gas flowing through the regeneration line, and in this case, the regeneration heater may be used as a catalyst heater configured to heat the regeneration gas flowing into the low-temperature catalyst.

The powder and granular material treatment apparatus may further include an exhaust gas and regeneration heat exchanger configured to cool the exhaust gas from the gas treatment unit and to heat the regeneration gas flowing through the regeneration line by heat exchange between the exhaust gas from the gas treatment unit and the regeneration gas flowing through the regeneration line.

In this configuration, since the temperature of the high-temperature exhaust gas from the gas treatment unit is reduced, the risk of the exhaust heat to the operator in the vicinity can be suppressed. On the other hand, since the temperature of the regeneration gas flowing through the regeneration line increases, the energy consumed for heating the regeneration gas can be reduced.

The powder and granular material treatment apparatus may further include a drying and regenerating heat exchanger configured to cool the drying gas flowing through the drying line and to heat the regenerating gas flowing through the regenerating line by heat exchange between the drying gas flowing through the drying line from the storage portion toward the dehumidifier.

In this configuration, since the temperature of the drying gas flowing from the storage portion toward the dehumidifier is reduced, the moisture contained in the drying gas can be favorably adsorbed to the adsorbent in the dehumidifier. As a result, the dry gas can be satisfactorily reduced in dew point. On the other hand, since the temperature of the regeneration gas flowing through the regeneration line increases, the energy consumed for heating the regeneration gas can be reduced.

The powder and granular material treatment apparatus may include both an exhaust gas and regeneration heat exchanger and a drying and regeneration heat exchanger.

The temperature of the exhaust gas from the gas treatment unit is preferably 110 ℃ or lower.

If the temperature of the exhaust gas is 110 ℃ or lower, environmental deterioration due to the exhaust gas can be favorably suppressed.

The gas treatment unit may be connected to a single regeneration line, or the gas treatment unit may be commonly connected to a plurality of regeneration lines in a configuration in which a plurality of groups including the drying line, the regeneration line, the storage unit, the heating unit, and the dehumidifying unit are provided as 1 group.

Another aspect of the present invention provides a method for treating a powder or granular material in an apparatus including a drying line through which a drying gas flows, a regeneration line through which a regeneration gas flows, and a container provided in the drying line and containing the powder or granular material, the method comprising: a heating step of heating the drying gas flowing through the drying line to the accommodating portion; a dehumidifying step of adsorbing moisture contained in the drying gas flowing through the drying line to the storage unit to the adsorbent, and dehumidifying the drying gas; a regeneration step of passing a regeneration gas flowing through the regeneration line through the adsorbent to regenerate the adsorbent; and a gas treatment step of decomposing the regeneration gas after passing through the adsorbent and then exhausting the decomposed regeneration gas.

According to this method, the same operational effects as those of the powder and granular material processing apparatus according to the first aspect can be exhibited.

A gas processing apparatus according to still another aspect of the present invention includes: a gas line through which a gas flows; a gas treatment unit connected to the downstream end of the gas line, for decomposing the gas from the gas line and discharging the gas; and a heat exchange unit configured to cool the exhaust gas from the gas treatment unit and to heat the gas flowing through the gas line by heat exchange between the exhaust gas from the gas treatment unit and the gas flowing through the gas line.

According to this configuration, the gas flowing through the gas line is exhausted after the decomposition treatment. Further, the temperature of the exhaust gas from the gas treatment unit is reduced by heat exchange between the exhaust gas from the gas treatment unit and the gas flowing through the gas line. Therefore, the exhaust gas from the gas line can be made harmless, and environmental deterioration due to the exhaust gas can be suppressed.

Further, since the temperature of the gas flowing in the gas line increases by heat exchange between the exhaust gas from the gas treatment section and the gas flowing in the gas line, when it is necessary to heat the gas flowing in the gas line, it is possible to achieve a reduction in the energy required for the heating.

Effects of the invention

According to the present invention, it is possible to suppress environmental deterioration caused by exhaust gas from a gas line other than a dry line such as a regeneration line through which a regeneration gas flows.

Drawings

Fig. 1 is a diagram schematically showing a configuration of a powder processing apparatus according to an embodiment of the present invention.

Fig. 2 is a block diagram schematically showing a configuration in which a deodorizing device is connected to a plurality of dehumidifying dryers.

Fig. 3 is a view schematically showing the structure of a powder processing apparatus according to another embodiment of the present invention.

Fig. 4 is a diagram schematically showing the constitution of the adsorbing portion.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

< powder treatment device >

Fig. 1 is a diagram schematically showing a configuration of a powder processing apparatus 1 according to an embodiment of the present invention.

The powder and granule processing apparatus 1 is an apparatus for processing powder and granule such as plastic granules, which are raw materials of plastic products, included in manufacturing facilities of plastic products. Specifically, the powder and granular material processing apparatus 1 is an apparatus that dries powder and granular material and conveys the dried powder and granular material to a forming machine.

< dehumidifying dryer >

The powder processing apparatus 1 includes a drying hopper 11 and a loading hopper 12 disposed above the drying hopper 11. The powder and particle material serving as the raw material of the plastic product is supplied from the loading hopper 12 to the drying hopper 11, dried in a state of being accommodated (accumulated) in the drying hopper 11, and then transferred from the drying hopper 11 to the molding machine.

A drying gas for drying the powder particles is supplied from a drying line 13 into the drying hopper 11. One end of the drying line 13 is disposed in the drying hopper 11. The other end of the drying line 13 is connected to an air outlet pipe 14 penetrating the upper wall of the drying hopper 11, and communicates with the inside of the drying hopper 11 via the air outlet pipe 14. The drying line 13 passes through a drying filter 15, an aftercooler 16, a drying blower 17, an adsorption unit 18, and a drying heater 19 in this order from the other end side of the drying line 13, that is, the air outlet pipe 14 side, outside the drying hopper 11.

An end of the discharge line 21 is connected to the suction port of the drying blower 17. The other end of discharge pipe 21 is connected to air discharge pipe 14. The dry filter 15 is attached to a middle portion of the exhaust line 21, and removes foreign matter from the dry gas flowing through the exhaust line 21. The discharge line 21 passes between the filter drier 15 and the drier blower 17 through the aftercooler 16. One end of a 1 st supply line 22 is connected to the outlet of the drying blower 17.

The adsorption unit 18 includes an adsorber 23. The adsorber 23 has a structure in which covers 25 are provided at both ends of a substantially cylindrical adsorption cylinder 24. The adsorption cylinder 24 has a large number of air flow paths extending in the center line direction thereof. The inner surface of the air flow path (the surface in contact with air) is formed of an adsorbent material (e.g., zeolite) that adsorbs moisture. The drying region, the cooling region, and the regeneration region are set in the region where the adsorption tube 24 exists, and the air flow path in the adsorption tube 24 includes an air flow path (hereinafter referred to as "drying flow path") existing in the drying region, an air flow path (hereinafter referred to as "cooling flow path") existing in the cooling region, and an air flow path (hereinafter referred to as "regeneration flow path") existing in the regeneration region. The cover 25 at one end of the adsorber 23 is provided with a port 26A communicating with the drying passage, a port 26B communicating with the cooling passage, and a port 26C communicating with the regeneration passage. The cover 25 at the other end of the adsorber 23 is provided with a port 27A communicating with the drying passage, a port 27B communicating with the cooling passage, and a port 27C communicating with the regeneration passage. The suction unit 18 further includes a rotation mechanism 28 that rotates the suction tube 24 around its center line. The rotation mechanism 28 includes a motor 29 as a driving source.

The adsorption unit 18 further includes a regeneration blower 31 and a regeneration heater 32. The suction port of the regeneration blower 31 is opened to the atmosphere through the regeneration filter 33. A regeneration line 34 is connected to the outlet of the regeneration blower 31. The regeneration line 34 includes a regeneration line 35 and an exhaust line 36. One end of the regeneration line 35 is connected to the outlet of the regeneration blower 31, and the middle portion of the regeneration line 35 passes through the aftercooler 16 and the regeneration heater 32 in this order, and the other end is connected to the port 26C of the adsorber 23. An end of the exhaust line 36 is connected to the port 27C of the adsorber 23. Thereby, the regeneration line 34 communicates with the regeneration flow path of the adsorption cylinder 24.

The other end of the 1 st supply line 22 is connected to the port 26A of the adsorber 23 so as to communicate with the dry flow path. On the other hand, one end of the 2 nd supply line 37 is connected to the port 27A communicating with the drying flow path. The intermediate portion of the 2 nd supply line 37 passes through the drying heater 19, penetrates the side wall of the drying hopper 11, and has the other end disposed in the drying hopper 11. In the drying hopper 11, the other end portion of the 2 nd supply line 37 is bent and extended downward to form a conical shape expanding downward. Further, between the adsorption unit 18 and the drying heater 19, the 1 st return line 38 branches off and is connected to the 2 nd supply line 37. The 1 st return line 38 is connected to the port 27B of the adsorber 23 and communicates with the cooling flow path of the adsorption cylinder 24. One end of a 2 nd return line 39 is connected to the other port 26B communicating with the cooling flow path. Between the drier filter 15 and the aftercooler 16, the other end of the 2 nd return line 39 branches off and is connected to the discharge line 21.

When the drying blower 17 is driven, air is blown out from the air outlet of the drying blower 17 to the 1 st supply line 22, and an air flow of the drying gas toward the adsorption unit 18 is generated in the 1 st supply line 22. The gas flow flows from the port 26A of the adsorber 23 into the drying passage of the adsorption cylinder 24, and flows out from the port 27A of the adsorber 23 to the 2 nd supply line 37 through the drying passage. When the air flow passes through the drying flow path, moisture contained in the air flow is adsorbed by the adsorption cylinder 24, and the air flow passing through the drying flow path becomes a low dew point dry air flow. A part of the air flow flowing out to the 2 nd supply line 37 flows into the 1 st return line 38, flows into the cooling flow path from the port 27B of the adsorber 23, and flows into the 2 nd return line 39 from the port 26B of the adsorber 23 through the cooling flow path. When the air flow passes through the cooling flow path, a portion heated by the regeneration air described later in the regeneration region of the adsorber 23 to be heated to a high temperature is cooled. This allows the adsorber 23 to return to a temperature at which moisture can be adsorbed in the next drying region.

The drying gas flowing through the 2 nd supply line 37 is heated by the drying heater 19, and the heated drying gas is supplied into the drying hopper 11. The temperature of the drying gas is, for example, 60 to 180 ℃. The dry gas blown out from the other end of the 2 nd supply line 37 passes through the powder particles stored in the dry hopper 11 and passes through the powder particles stored therein to be discharged above the powder particles. Thereby, the moisture of the powder is deprived by the drying gas, and the powder is dried. The dry gas deprived of moisture from the powder and particle is discharged to the discharge duct 21 through the air discharge duct 14, and flows through the discharge duct 21 toward the drying blower 17.

On the other hand, the regenerative blower 31 is driven. When the regeneration blower 31 is driven, the outside air is sucked into the suction port of the regeneration blower 31 through the regeneration filter 33. Then, the outside air is blown out from the outlet of the regeneration blower 31 to the regeneration pipe 35 of the regeneration line 34, and an air flow toward the adsorption unit 18 is generated in the regeneration pipe 35. After passing through the aftercooler 16 and the regeneration heater 32 in this order, the air flow (outside air) flows from the port 26C of the adsorber 23 into the regeneration passage of the adsorption cylinder 24, and is discharged from the port 27C of the adsorber 23 to the exhaust line 36 of the regeneration line 34 through the regeneration passage. In the aftercooler 16, heat exchange is performed between the outside air flowing through the regeneration line 34 and the dry gas flowing through the exhaust line 21, the outside air flowing through the regeneration line 34 is warmed, and the dry gas flowing through the exhaust line 21 is cooled. The external air flowing through the regeneration line 34 is further heated by the regeneration heater 32 to become a regeneration gas, and the regeneration gas passes through the regeneration flow path of the adsorption cylinder 24. On the other hand, the portion of the adsorption cylinder 24 in the drying region where moisture is adsorbed from the drying gas moves to the regeneration region along with the rotation of the adsorption cylinder 24 by the rotation mechanism 28. Thereby, the moisture adsorbed by the adsorption cylinder 24 is released from the adsorption cylinder 24, and the adsorption cylinder 24 is regenerated to a low humidity state. In order to release moisture from the adsorption cylinder 24, the temperature of the regeneration gas is set to 180 to 250 ℃.

The lower part of the drying hopper 11 is formed in a conical shape tapered downward toward the front end, and a discharge port 41 is formed at the lower end thereof. The drying hopper 11 is provided with a shutter 42 for opening and closing the discharge port 41. In a state where the shutter 42 is closed to close the discharge port 41, the powder and granular material supplied from the loading hopper 12 can be accumulated in the drying hopper 11. A discharge branch pipe 43 is connected to the discharge port 41. The discharge branch line 43 is mounted to the transfer line 44. When the shutter 42 is opened to open the discharge port 41 from the state where the powder and granule is stored in the drying hopper 11, the powder and granule in the drying hopper 11 is discharged from the discharge port 41 to the discharge branch pipe 43.

The transfer line 44 includes a switching valve 45, a 1 st transfer line 46, and a 2 nd transfer line 47.

The switching valve 45 has an input port 51, a circulation output port 52, an atmosphere opening port 53, and a dry line introduction port 54. The switching valve 45 is provided with a valve body that opens and closes the circulation output port 52, the atmosphere opening port 53, and the dry line introduction port 54 independently. The switching valve 45 is switched to a circulation position closing the circulation output port 53, opening the circulation output port 52 and the dry line introduction port 54, and communicating the input port 51 with the circulation output port 52 and the dry line introduction port 54 in the valve housing, an open position closing the circulation output port 52 and the dry line introduction port 54, opening the atmosphere opening port 53, communicating the input port 51 with the atmosphere opening port 53 in the valve housing, and a dry line introduction position closing the circulation output port 52 and the atmosphere opening port 53, opening the dry line introduction port 54, and communicating the input port 51 with the dry line introduction port 54 in the valve housing, depending on the positions of the valve housing.

One end of the 1 st delivery line 46 is connected to the circulation output port 52 of the switching valve 45. A transport destination hopper for accumulating the powder and granular material charged into the molding machine is provided above the molding machine, and the other end of the 1 st transport pipe 46 is connected to the side wall of the transport destination hopper and communicates with the inside of the transport destination hopper.

One end of the 2 nd conveying line 47 is connected to the upper wall of the conveying destination hopper, and communicates with the inside of the conveying destination hopper. The other end of the 2 nd delivery line 47 is connected to the input port 51 of the switching valve 45. The 1 st and 2 nd switching valve 55, the cyclone 56, the transfer filter 57, and the transfer blower 58 are mounted in this order on the 2 nd transfer line 47 from the transfer destination hopper side.

The 1 st-2 nd switching valve 55 has a 1 st input port 61, a 2 nd input port 62, and an output port 63. The 1 st-2 nd switching valve 55 is provided with a valve body for independently opening and closing the 1 st input port 61 and the 2 nd input port 62. The 1 st-order-2 nd switching valve 55 is switched between a 1 st-order delivery position closing the 2 nd-order input port 62, opening the 1 st-order input port 61, and communicating the 1 st-order input port 61 with the output port 63 in the valve housing, and a 2 nd-order delivery position closing the 1 st-order input port 61, opening the 2 nd-order input port 62, and communicating the 2 nd-order input port 62 with the output port 63 in the valve housing, depending on the positions of these valve bodies.

The 2 nd transfer line 47 is further subdivided into a 1 st line portion 71, a 2 nd line portion 72, a 3 rd line portion 73, a 4 th line portion 74, and a 5 th line portion 75. One end of the 1 st pipe portion 71 is connected to the upper wall of the conveyance destination hopper as one end of the 2 nd conveying pipe 47, and the other end of the 1 st pipe portion 71 is connected to the 2 nd input port 62 of the 1 st-second switching valve 55. One end of the 2 nd pipe portion 72 is connected to the output port 63 of the 1 st-to-2 nd switching valve 55, and the other end of the 2 nd pipe portion 72 is connected to the air introduction portion 76 of the cyclone 56. One end of the 3 rd pipe portion 73 is connected to the suction portion 77 of the cyclone dust collector 56, and the other end of the 3 rd pipe portion 73 is connected to the inlet 78 of the transport filter 57. One end of the 4 th pipe portion 74 is connected to the outlet 79 of the transport filter 57, and the other end of the 4 th pipe portion 74 is connected to the suction port of the transport blower 58. One end of the 5 th pipe portion 75 is connected to the blowout port of the conveyance blower 58, and the other end of the 5 th pipe portion 75 is connected to the input port 51 of the switching valve 45.

Further, one end of a 1-time suction line 81 is connected to the upper wall of the loading hopper 12, and the 1-time suction line 81 communicates with the inside of the loading hopper 12. The other end of the 1-time suction line 81 is connected to the 1-time input port 61 of the 1-time 2-time switching valve 55. One end of a powder supply line 82 is connected to a side wall of the loading hopper 12. The powder supply line 82 extends toward a raw material tank (not shown) in which powder is stored, and the other end thereof is connected to a suction pipe 83 disposed in the raw material tank.

When powder and granular material is supplied from the material tank to the loading hopper 12, the switching valve 45 is set to the open position, and the 1-time-2-time switching valve 55 is set to the 1-time conveying position. When the conveyance blower 58 is driven, air is sucked from the 4 th pipe portion 74 to the suction port of the conveyance blower 58, and the air is blown out from the blowing port of the conveyance blower 58 to the 5 th pipe portion 75. The air blown out to the 5 th pipe portion 75 enters the valve housing of the switching valve 45 from the input port 51 of the switching valve 45, and is discharged to the atmosphere from the valve housing through the atmosphere opening port 53. Thus, negative pressure is generated in the 1 st suction line 81, the 2 nd line 72, the 3 rd line 73, and the 4 th line 74, and the powder and particle in the raw material tank is sucked up by the suction pipe 83 and supplied from the suction pipe 83 to the loading hopper 12 through the powder and particle supply line 82.

After the process of drying the powder and granular material, when the powder and granular material is transported from the drying hopper 11 to the transport destination hopper, the switching valve 45 is set to the circulation position, and the 1-time-2-time switching valve 55 is set to the 2-time transport position. Then, the conveyance blower 58 is driven. When the transport blower 58 is driven, air is sucked from the 4 th pipe portion 74 to the suction port of the transport blower 58, and the 4 th pipe portion 74 becomes negative pressure. By this negative pressure, the air in the conveyance destination hopper is sucked out to the 1 st pipe portion 71, and a flow of air is generated in the 1 st pipe portion 71, the 2 nd pipe portion 72, the 3 rd pipe portion 73, and the 4 th pipe portion 74. On the other hand, the air blown out from the air outlet of the conveyance blower 58 to the 5 th pipe portion 75 enters the valve housing of the switching valve 45 from the input port 51 of the switching valve 45, and flows out from the circulation output port 52 of the switching valve 45 to the 1 st conveyance pipe 46 and the port 26A. Thereby, the air circulates through the transfer line 44 composed of the switching valve 45, the 1 st transfer line 46, and the 2 nd transfer line 47, and a transfer air flow is generated. When the shutter 42 of the drying hopper 11 is opened and the discharge port 41 of the drying hopper 11 is opened, the powder and particle in the drying hopper 11 is sucked out from the discharge port 41 to the transfer line 44, and the powder and particle is transferred to the transfer destination hopper in the transfer line 44 (1 st transfer line 46) with the transfer air flow. At this time, the dry air also flows from the dry hopper 11 into the transfer line 44, and the transfer air flowing through the transfer line 44 can be made low in humidity.

Foreign matter such as dust contained in the transport air flow is trapped when the transport air flow passes through the cyclone 56 and the transport filter 57. In the cyclone 56, air is sucked from the suction part 77 of the cyclone 56 to the 3 rd pipe part 73, whereby the inside of the cyclone 56 becomes negative pressure. By this negative pressure, air (air flow for conveyance) is sucked into the cyclone 56 from the 2 nd pipe portion 72 through the air introduction portion 76, and the air swirls in the cyclone 56, and the air and the foreign matter are separated by centrifugal force and gravity, and the foreign matter is accumulated in a collection box connected to the lower end of the cyclone 56.

When VOC (Vo l at i l e Organ i c Compounds: volatile organic compound) is contained in the additive of the powder and granular material, the VOC volatilizes with the drying of the powder and granular material, and thus the drying gas circulated through the drying line 13 contains VOC volatilized from the powder and granular material. Since a part of the VOC contained in the drying gas circulated through the drying line 13 adheres to the adsorption cylinder 24 (adsorbent) of the adsorption unit 18, the regeneration gas discharged from the port 27C of the adsorber 23 to the exhaust line 36 of the regeneration line 34 also contains VOC. The adsorbent used for the adsorption cylinder 24 can adsorb and desorb the odor component even with a normal moisture adsorbent, but the normal moisture adsorbent may be changed to an adsorbent suitable for removing the target VOC, or an adsorbent suitable for VOC and a normal moisture adsorbent may be used in combination. This can efficiently discharge VOC, which is an odor component, from the regeneration line 34.

< deodorization device >

The powder and granular material processing apparatus 1 is equipped with a deodorizing device 91. The deodorizing device 91 is connected to the downstream end of the exhaust line 36 of the regeneration line 34, functions as a gas treatment unit for exhausting the regeneration gas flowing through the exhaust line 36 to the outside air, performs deodorizing treatment for removing VOC from the regeneration gas, and discharges the deodorized regeneration gas (exhaust gas) to the outside air.

Specifically, the deodorizing device 91 includes a deodorizing line 92 connected to the exhaust line 36 and communicating with the exhaust line 36. In the deodorizing device 91, a catalyst decomposition method is used as a deodorizing treatment method, and a catalyst heater 93 and a low-temperature catalyst 94 are installed in the deodorizing line 92 in this order from the exhaust line 36 side. The regeneration gas flowing from the exhaust line 36 into the deodorizing line 92 is heated by the catalyst heater 93 to a temperature of 200 to 300 ℃, and then contacts the low temperature catalyst 94 to pass through the low temperature catalyst 94. At this time, chemical decomposition of VOC contained in the regeneration gas occurs, and VOC is removed from the regeneration gas flowing through the deodorizing line 92. In addition, depending on the characteristics, VOC is present among VOCs, which can be decomposed even in a low temperature region of a relatively low temperature, and in this case, the catalyst heater 93 may be omitted. At this time, the regeneration gas is heated to 180 ℃ or higher by the regeneration heater 32, thereby promoting the decomposition of the VOC in the low-temperature catalyst 94. That is, the regeneration heater 32 can be used as a catalyst heater for heating the regeneration gas flowing into the low-temperature catalyst 94.

The deodorizing device 91 is further provided with an aftercooler 95. Deodorization line 92 passes through aftercooler 95 on the downstream side of low temperature catalyst 94. On the other hand, the regeneration line 35 of the regeneration line 34 passes through an aftercooler 95 between the aftercooler 16 and the regeneration heater 32. In the aftercooler 95, heat exchange is performed between the outside air (regeneration gas) flowing through the regeneration line 34 and the exhaust gas (regeneration gas) flowing through the deodorization line 92, the outside air flowing through the regeneration line 34 is warmed, and the exhaust gas flowing through the deodorization line 92 is cooled. As a result, the exhaust gas flowing through the deodorizing line 92 is discharged to the outside air at a temperature of as low as 110 ℃.

< Effect >

As described above, the heated and dehumidified drying gas is supplied to the drying hopper 11, and the powder and particle bodies stored in the drying hopper 11 are dried. In the adsorption unit 18 for dehumidifying the dry gas, a drying region, a cooling region, and a regeneration region are set, and moisture contained in the dry gas is adsorbed by the adsorbent in the adsorption cylinder 24 in the drying region, so that the dry gas is dehumidified, and moisture is deprived from the adsorbent by the regeneration gas in the regeneration region, so that the adsorbent is regenerated. The regeneration gas deprived of moisture from the adsorbent is deodorized by the deodorizing device 91 and then exhausted to the outside air. Therefore, environmental deterioration caused by exhaust gas from the regeneration line 34 through which the regeneration gas flows can be suppressed.

The deodorization treatment by the deodorizing device 91 is a treatment based on a catalyst decomposition method using a low-temperature catalyst (low-temperature deodorizing catalyst) 94. This can suppress the treatment temperature to a low temperature of 200 to 400 ℃, thereby saving energy.

The deodorizing device 91 is provided with an aftercooler 95 for exchanging heat between the regeneration gas flowing through the regeneration line 34 and the exhaust gas flowing through the deodorizing line 92. The exhaust gas flowing through the deodorizing line 92 is cooled to 110 ℃ or lower, for example, 92 to 93 ℃ by heat exchange in the aftercooler 95. Therefore, the exhaust gas can be made more harmless, and the environmental deterioration caused by the exhaust gas can be further suppressed. On the other hand, since the temperature of the regeneration gas flowing through the regeneration line 34 increases, the energy required for heating the regeneration gas can be reduced.

In the powder and granular material processing apparatus 1, an aftercooler 16 is provided for performing heat exchange between the regeneration gas flowing through the regeneration line 34 and the drying gas flowing through the discharge line 21. As a result, the temperature of the drying gas flowing from the drying hopper 11 to the adsorption unit 18 is reduced, and therefore, moisture contained in the drying gas can be favorably adsorbed by the adsorbent in the adsorption unit 18. As a result, the dry gas can be satisfactorily reduced in dew point. On the other hand, since the temperature of the regeneration gas flowing through the regeneration line 34 increases, it is possible to further reduce the energy required for heating the regeneration gas.

< modification 1>

For example, in the above-described embodiment, the powder processing apparatus 1 is configured such that the deodorizing device 91 is incorporated in a dehumidifying dryer for dehumidifying and drying the powder, but the deodorizing device 91 may be external to the dehumidifying dryer.

In this case, as shown in fig. 2, 1 deodorizing device 91 is provided for each of the plurality of dehumidification dryers, the deodorizing device 91 is commonly connected to the regeneration line 34 of each dehumidification dryer, and the deodorizing device 91 performs deodorizing treatment on the exhaust gas (regeneration gas) from the regeneration line 34 of each dehumidification dryer.

The following structure may be used: the adsorbing portion 18 includes a hydrophilic adsorbent (moisture adsorbent) and a hydrophobic adsorbent (adsorbent for other components) arranged in the centerline direction of the adsorbing tube 24 in the adsorbing tube 24, adsorbs moisture contained in the dry gas to the hydrophilic adsorbent in the drying region, adsorbs other components (for example, organic components such as VOC) other than the moisture contained in the dry gas to the hydrophobic adsorbent, and in the regenerating region, the hydrophilic adsorbent is regenerated by depriving the hydrophilic adsorbent of moisture by the regenerating gas and the hydrophobic adsorbent of organic components by the regenerating gas. The hydrophilic adsorbent and the hydrophobic adsorbent are, for example, honeycomb structures made of zeolite.

< another embodiment >

Fig. 3 is a diagram schematically showing the structure of a powder processing apparatus 101 according to another embodiment of the present invention.

The powder processing apparatus 101 is an apparatus for drying powder such as plastic granules, which are raw materials of plastic products, and conveying the dried powder to a molding machine, similarly to the powder processing apparatus 1 described above, which is included in a manufacturing facility of plastic products.

The powder processing apparatus 101 includes a drying hopper 111 and a loading hopper 112 disposed above the drying hopper 111. The powder and particle material serving as the raw material of the plastic product is supplied from the loading hopper 112 to the drying hopper 111, dried in a state of being accommodated (accumulated) in the drying hopper 111, and then transferred from the drying hopper 111 to the molding machine.

A drying gas for drying the powder particles is supplied from a drying line 113 into the drying hopper 111. One end of the drying line 113 is disposed in the drying hopper 111. The other end of drying line 113 is connected to air outlet pipe 114 penetrating the upper portion of the side wall of drying hopper 111, and communicates with inside of drying hopper 111 via air outlet pipe 114. In the drying line 113, the drying filter 115, the aftercooler 116, the drying blower 117, the adsorption unit 118, and the drying heater 119 pass outside the drying hopper 111 in this order from the other end side of the drying line 113, that is, the air outlet duct 114 side.

The drying line 113 includes a discharge line 121, a 1 st supply line 122, and a 2 nd supply line 123. One end of discharge duct 121 is connected to air discharge duct 114, and the other end of discharge duct 121 is connected to the suction port of drying blower 117. The dry filter 115 is attached to a middle portion of the exhaust line 121, and removes foreign substances from the dry gas flowing through the exhaust line 121. The drain line 121 passes through the aftercooler 116 between the filter drier 115 and the drier blower 117.

The adsorption unit 118 includes an adsorber 124. The adsorber 124 has a structure in which covers 126 are provided at both ends of a substantially cylindrical adsorption cylinder 125. As shown in fig. 4, a hydrophilic adsorbent 127 and a hydrophobic adsorbent 128 are provided in the adsorption cylinder 125. The hydrophilic adsorbent 127 and the hydrophobic adsorbent 128 are honeycomb structures made of zeolite, are formed into a cylindrical shape having the same diameter, and are stacked in the direction of the center line of the adsorption cylinder 125. Hydrophilic adsorbent 127 is designed to well adsorb moisture, and hydrophobic adsorbent 128 is designed to well adsorb VOCs.

In addition, a drying region, a cooling region, and a regeneration region are set in the adsorption cylinder 125. The cover 126 at one end of the adsorber 124 is provided with a port 131A communicating with the drying zone, a port 131B communicating with the cooling zone, and a port 131C communicating with the regeneration zone. The cover 126 at the other end of the adsorber 124 is provided with a port 132A communicating with the drying zone, a port 132B communicating with the cooling zone, and a port 132C communicating with the regeneration zone. The suction unit 118 further includes a rotation mechanism 133 that rotates the suction tube 125 around its center line. The rotation mechanism 133 includes a motor 134 as a driving source.

One end of the 1 st supply line 122 is connected to the outlet of the drying blower 117, and the other end of the 1 st supply line 122 is connected to the port 132A of the adsorber 124. Thus, the 1 st supply line 122 communicates with the drying region of the adsorption cylinder 125. On the other hand, one end of the 2 nd supply line 123 is connected to the port 131A communicating with the drying region. The intermediate portion of the 2 nd supply line 123 passes through the drying heater 119, penetrates the side wall of the drying hopper 111, and has the other end disposed in the drying hopper 111. In the drying hopper 111, the other end portion of the 2 nd supply pipe 123 is bent and extended downward, and is formed in a conical shape that spreads downward.

Between the adsorption unit 118 and the drying heater 119, the 1 st return line 135 branches off and is connected to the 2 nd supply line 123. The 1 st return line 135 is connected to port 131B of the adsorber 124 and communicates with the cooling zone of the adsorber cartridge 125. One end of the 2 nd return line 136 is connected to the other port 132B communicating with the cooling region. Between the aftercooler 116 and the drying blower 117, the other end of the 2 nd return line 136 branches off to be connected to the discharge line 121.

The adsorption unit 118 includes a regeneration blower 141 and a regeneration heater 142. The suction port of the regeneration blower 141 is opened to the atmosphere through the regeneration filter 143. A regeneration line 144 is connected to the outlet of the regeneration blower 141. Regeneration line 144 includes a regeneration line 145 and an exhaust line 146. One end of the regeneration line 145 is connected to the outlet of the regeneration blower 141, and the middle portion of the regeneration line 145 passes through the aftercooler 116 and the regeneration heater 142 in this order, and the other end is connected to the port 131C of the adsorber 124. An end of the exhaust line 146 is connected to the port 132C of the adsorber 124. Thereby, the regeneration line 144 communicates with the regeneration zone of the adsorption cylinder 125.

When the drying blower 117 is driven, air is blown out from the outlet of the drying blower 117 to the 1 st supply line 122, and a flow of the drying gas toward the adsorber 124 is generated in the 1 st supply line 122. The gas flow flows from the port 132A of the adsorber 124 into the drying region of the adsorption cylinder 125, and flows out from the port 132B of the adsorber 124 to the 2 nd supply line 123 through the drying region. When the air flow passes through the drying region, moisture contained in the air flow is adsorbed by the hydrophilic adsorbent 127, and the air flow passing through the drying region becomes a low dew point dry air flow. A portion of the gas flow flowing out to the 2 nd supply line 123 flows into the 1 st return line 135, flows into the cooling zone from the port 131B of the adsorber 124, and flows out from the port 132B of the adsorber 124 to the 2 nd return line 136 through the cooling zone. When the air flow passes through the 2 nd drying zone, the regenerated air is heated in the regeneration zone of the adsorber 124 and the heated portion is cooled. This allows the adsorber 124 to return to a temperature at which moisture can be adsorbed in the next drying zone.

The drying gas flowing through the 2 nd supply line 123 is heated by the drying heater 119, and the heated drying gas is supplied into the drying hopper 111. The temperature of the drying gas supplied into the drying hopper 111 is, for example, 60 to 180 ℃. The dry gas blown out from the other end of the 2 nd supply line 123 passes through the powder particles stored in the dry hopper 111, and passes through the powder particles stored therein to be discharged above the powder particles. Thereby, the moisture of the powder is deprived by the drying gas, and the powder is dried. The dry gas deprived of moisture from the powder and particle is discharged to the discharge line 121 through the air discharge pipe 114, and flows through the discharge line 121 toward the dry blower 117.

When VOC is contained in the additive of the powder, the VOC volatilizes from the powder as the powder dries. Therefore, the drying gas circulated in the drying line 113 contains VOC volatilized from the powder particles. When the flow of the dry gas passes through the dry region of the adsorption cylinder 125, VOC volatilized from the powder and particle contained in the flow is adsorbed by the hydrophobic adsorbent 128.

On the other hand, the regeneration blower 141 is driven. When the regeneration blower 141 is driven, the external air is sucked into the suction port of the regeneration blower 141 through the regeneration filter 143. Then, the outside air is blown out from the outlet of the regeneration blower 141 to the regeneration line 145 of the regeneration line 144, and an air flow toward the adsorber 124 is generated in the regeneration line 145. After passing through the aftercooler 116 and the regeneration heater 142 in this order, the gas flow (outside air) flows from the port 131C of the adsorber 124 into the regeneration zone of the adsorption cylinder 125, passes through the regeneration zone, and flows out from the port 132C of the adsorber 124 to the exhaust line 146 of the regeneration line 144. In the aftercooler 116, heat exchange is performed between the outside air flowing through the regeneration line 144 and the dry gas flowing through the exhaust line 121, the outside air flowing through the regeneration line 144 is warmed, and the dry gas flowing through the exhaust line 121 is cooled. The external air flowing through the regeneration line 144 is further heated by the regeneration heater 142 to become a regeneration gas, and the regeneration gas passes through the regeneration flow path of the adsorption cylinder 125.

On the other hand, the portion of the hydrophilic adsorbent 127 that adsorbs moisture from the drying gas in the drying region and the portion of the hydrophobic adsorbent 128 that adsorbs VOCs from the drying gas in the drying region move to the regeneration region in accordance with the rotation of the adsorption cylinder 125 by the rotation mechanism 133. Thus, the moisture is released from the hydrophilic adsorbent 127, and the VOC is released from the hydrophobic adsorbent 128, whereby the hydrophilic adsorbent 127 and the hydrophobic adsorbent 128 are regenerated. The temperature of the regeneration gas is set to, for example, 180 to 250 ℃.

The lower part of the drying hopper 111 is formed in a conical shape tapered downward toward the front end, and a discharge port 151 is formed at the lower end thereof. The drying hopper 111 is provided with a shutter 152 for opening and closing the discharge port 151. In a state where the gate 152 is closed to close the discharge port 151, the powder and granular material supplied from the loading hopper 112 can be stored in the drying hopper 111. A discharge branch line 153 is connected to the discharge port 151. When the shutter 152 is opened to open the discharge port 151 from the state where the powder and granule is stored in the drying hopper 111, the powder and granule in the drying hopper 111 is discharged from the discharge port 151 to the discharge branch line 153.

The discharge branch line 153 is included in the transfer line 154. The transfer line 154 includes a switching valve 155, a 1 st transfer line 156, and a 2 nd transfer line 157 in addition to the discharge branch line 153. The discharge branch line 153 is attached to a middle portion of the 1 st transfer line 156.

The switching valve 155 has an input port 161, a circulation output port 162, and an atmosphere opening port 163. The switching valve 155 is provided with a valve body for independently opening and closing the circulation output port 162 and the atmosphere opening port 163. The switching valve 155 is switched between a circulation position closing the atmosphere opening port 163 and opening the circulation output port 162, and a valve box closing the circulation output port 162 and opening the atmosphere opening port 163, and opening the circulation output port 162 and opening the atmosphere opening port 163, respectively, and opening the circulation output port 161 and the atmosphere opening port 163, respectively.

One end of the 1 st transfer line 156 is connected to the circulation output port 162 of the switching valve 155. A transport destination hopper for accumulating the powder and granular material charged into the molding machine is provided above the molding machine, and the other end of the 1 st transport pipe 156 is connected to the side wall of the transport destination hopper and communicates with the inside of the transport destination hopper.

One end of the 2 nd transfer line 157 is connected to the upper wall of the transfer destination hopper and communicates with the inside of the transfer destination hopper. The other end of the 2 nd transfer line 157 is connected to the input port 161 of the switching valve 155. A 1 st to 2 th switching valve 164, a cyclone 165, a transfer filter 166, and a transfer blower 167 are attached to the 2 nd transfer line 157 in this order from the transfer destination hopper side.

The 1 st-2 nd switching valve 164 has a 1 st input port 171, a 2 nd input port 172, and an output port 173. The 1 st-second switching valve 164 is provided with a valve body that opens and closes the 1 st input port 171 and the 2 nd input port 172 independently. The 1 st-order-2 nd switching valve 164 is switched to a 1 st-order delivery position closing the 2 nd-order input port 172, opening the 1 st-order input port 171, communicating the 1 st-order input port 171 with the output port 173 in the valve housing, and a 2 nd-order delivery position closing the 1 st-order input port 171, opening the 2 nd-order input port 172, communicating the 2 nd-order input port 172 with the output port 173 in the valve housing, depending on the positions of these valve bodies.

The 2 nd transfer line 157 is further subdivided into a 1 st line portion 174, a 2 nd line portion 175, a 3 rd line portion 176, a 4 th line portion 177, and a 5 th line portion 178. One end of the 1 st pipe portion 174 is connected to the upper wall of the conveyance destination hopper as one end of the 2 nd conveying pipe 157, and the other end of the 1 st pipe portion 174 is connected to the 2 nd input port 172 of the 1 st-second switching valve 164. One end of the 2 nd pipe portion 175 is connected to the output port 173 of the 1 st-2 nd switching valve 164, and the other end of the 2 nd pipe portion 175 is connected to the air introduction portion 181 of the cyclone 165. One end of the 3 rd pipe portion 176 is connected to the suction portion 182 of the cyclone dust collector 165, and the other end of the 3 rd pipe portion 176 is connected to the inlet 183 of the transport filter 166. One end of the 4 th pipe portion 177 is connected to the outlet 184 of the transport filter 166, and the other end of the 4 th pipe portion 177 is connected to the suction port of the transport blower 167. One end of the 5 th pipe portion 178 is connected to the blow-out port of the conveyance blower 167, and the other end of the 5 th pipe portion 178 is connected to the input port 161 of the switching valve 155.

Further, one end of a 1-time suction line 185 is connected to the upper wall of the loading hopper 112, and the 1-time suction line 185 communicates with the inside of the loading hopper 112. The other end of the 1-time suction line 185 is connected to the 1-time input port 171 of the 1-time 2-time switching valve 164. One end of a powder supply line 186 is connected to a side wall of the loading hopper 112. The powder supply line 186 extends toward a raw material tank (not shown) in which powder is stored, and the other end thereof is connected to a suction pipe disposed in the raw material tank.

When powder and granular material is supplied from the material tank to the loading hopper 112, the switching valve 155 is set to the open position, and the 1-time-2-time switching valve 164 is set to the 1-time conveying position. When the transport blower 167 is driven, air is sucked from the 4 th duct portion 177 to the suction port of the transport blower 167, and the air is blown out from the outlet port of the transport blower 167 to the 5 th duct portion 178. The air blown out to the 5 th pipe portion 178 enters the valve housing of the switching valve 155 from the input port 161 of the switching valve 155, and is discharged to the atmosphere from the valve housing through the atmosphere opening port 163. Thus, negative pressure is generated in the 1 st suction line 185, the 2 nd line 175, the 3 rd line 176, and the 4 th line 177, and the powder and particle in the raw material tank is sucked up by the suction pipe and supplied from the suction pipe into the loading hopper 112 through the powder and particle supply line 186.

After the process of drying the powder and granular material, when the powder and granular material is transported from the drying hopper 111 to the transport destination hopper, the switching valve 155 is set to the circulation position, and the 1-to-2-time switching valve 164 is set to the 2-time transport position. Then, the conveying blower 167 is driven. When the transport blower 167 is driven, air is sucked from the 4 th pipe portion 177 to the suction port of the transport blower 167, and the 4 th pipe portion 177 becomes negative pressure. By this negative pressure, the air in the conveyance destination hopper is sucked out to the 1 st pipe 174, and a flow of air is generated in the 1 st pipe 174, the 2 nd pipe 175, the 3 rd pipe 176, and the 4 th pipe 177. On the other hand, the air blown out from the air outlet of the conveyance blower 167 to the 5 th pipe portion 178 enters the valve housing of the switching valve 155 from the input port 161 of the switching valve 155, and flows out from the circulation output port 162 of the switching valve 155 to the 1 st conveyance pipe 156. Thereby, the air circulates through the transfer line 154 composed of the switching valve 155, the 1 st transfer line 156, and the 2 nd transfer line 157, and a transfer air flow is generated. When the shutter 152 of the drying hopper 111 is opened to open the discharge port 151 of the drying hopper 111, the powder and particle in the drying hopper 111 is sucked out from the discharge port 151 to the transfer line 154, and the powder and particle is transferred to the transfer destination hopper in the transfer line 154 (1 st transfer line 156) with the transfer airflow.

Foreign matter such as dust contained in the transport air flow is trapped when the transport air flow passes through the cyclone 165 and the transport filter 166. In the cyclone 165, air is sucked from the suction part 182 of the cyclone 165 to the 3 rd pipe part 176, and thus the inside of the cyclone 165 is negative pressure. By this negative pressure, air (air flow for conveyance) is sucked into the cyclone 165 from the 2 nd pipe portion 175 via the air introduction portion 181, and the air swirls in the cyclone 165, and the air and the foreign matter are separated by centrifugal force and gravity, and the foreign matter is accumulated in a collection box connected to the lower end of the cyclone 165.

The exhaust line 146 of the regeneration line 144 is connected to a deodorizing line 191, and the deodorizing line 191 is used for deodorizing the regeneration gas flowing from the adsorber 124 to the exhaust line 146 by decomposition treatment. The deodorizing line 191 is configured by a catalyst decomposition method as a deodorizing treatment method, similarly to the deodorizing device 91 in the above embodiment. That is, a low temperature catalyst 192 is installed in the deodorizing line 191. Further, both ends of the heating branch pipe 193 are connected to the deodorizing line 191 on the exhaust line 146 side of the low temperature catalyst 192. The middle portion of the heating branch pipe 193 passes through the catalyst heater 194.

A part of the regeneration gas flowing from the exhaust line 146 into the deodorizing line 191 flows through the heating branch pipe 193, is heated by the catalyst heater 194, and then merges with the regeneration gas flowing through the deodorizing line 191. Thereby, the temperature of the regeneration gas flowing through the deodorizing line 191 is raised to 200 to 300 ℃, and the regeneration gas after the temperature rise passes through the low-temperature catalyst 192. At this time, chemical decomposition of VOC contained in the regeneration gas occurs, and VOC is removed from the regeneration gas flowing through the deodorizing line 191.

In addition, the catalyst heater 194 may be omitted in the case where VOC can be decomposed in a low temperature region of a relatively low temperature.

Further, the deodorizing line 191 passes through the exhaust gas and regeneration heat exchanger 195 on the downstream side of the low temperature catalyst 192. On the other hand, the regeneration line 145 of the regeneration line 144 passes through an exhaust gas and regeneration heat exchanger 195 between the aftercooler 116 and the regeneration heater 142. In the exhaust gas-to-regeneration heat exchanger 195, heat exchange is performed between the external air (regeneration gas) flowing through the regeneration line 144 and the exhaust gas (regeneration gas) flowing through the deodorization line 191, the external air flowing through the regeneration line 144 increases in temperature, and the exhaust gas flowing through the deodorization line 191 decreases in temperature. As a result, the exhaust gas flowing through the deodorizing line 191 is discharged to the outside air at a temperature of as low as 110 ℃.

< Effect >

The heated and dehumidified drying gas is supplied to the drying hopper 111, whereby the powder and particle contained in the drying hopper 111 is dried. The adsorption unit 118 is provided with a drying region in which moisture contained in the drying gas is adsorbed by the hydrophilic adsorbent 127 to dehumidify the drying gas, and a regeneration region in which moisture is deprived from the hydrophilic adsorbent 127 by the regeneration gas to regenerate the hydrophilic adsorbent 127. In addition, VOCs contained in the drying gas are adsorbed by the hydrophobic adsorbent 128 in the drying region, and VOCs are deprived from the hydrophobic adsorbent 128 by the regenerating gas in the regenerating region, whereby the hydrophobic adsorbent 128 is regenerated. The regeneration gas, which deprives VOC as an odor component from the hydrophobic adsorbent 128, is decomposed by the deodorizing line 191 and then exhausted. Therefore, environmental deterioration caused by the exhaust gas from the regeneration line 144 through which the regeneration gas flows can be suppressed.

Further, the powder processing apparatus 101 can also exhibit the same operational effects as those of the above-described powder processing apparatus 1.

< modification example 2>

In the above embodiments, the heat of the exhaust gas flowing through the deodorizing lines 92 and 191 is used for heating the regeneration gas flowing through the regeneration lines 34 and 144, but the heat of the exhaust gas flowing through the deodorizing lines 92 and 191 may be used for heating the drying hoppers 11 and 111 or the conveying destination hoppers, and may be used for heating devices other than the powder and particle processing devices 1 and 101, for example, a mixer for mixing a plurality of materials including powder and particle.

The deodorizing device 91 is not limited to the use in the powder and granular material processing device 1 (dehumidifying dryer), and may be used in facilities that do not process powder and granular materials. For example, the deodorizing device 91 may be used for deodorizing the exhaust gas from the smoking point to the outside air, and in this case, the heat of the exhaust gas flowing through the deodorizing line 92 may be used for heating the inside of the smoking point. In addition, the deodorizing device 91 may be used for deodorizing the exhaust gas from the painting factory to the outside air, and in this case, the heat of the exhaust gas flowing through the deodorizing line 92 may be used for drying the paint applied to the painted object.

In the deodorizing device 91, a catalyst decomposition method using a low-temperature catalyst 94 is used as a deodorizing treatment method. In addition, a catalyst decomposition method using a low-temperature catalyst 192 is also used in the deodorizing line 191. However, as the deodorizing treatment method, a combustion method of oxidizing and decomposing an odor component (volatile component) such as VOC by high-temperature treatment, an ozone oxidation method of oxidizing and decomposing an odor component by bringing ozone into contact with the odor component, a plasma decomposition method of oxidizing and decomposing an odor component by plasma, a photocatalyst decomposition method of oxidizing and decomposing an odor component by ultraviolet rays and a catalyst containing titanium oxide as a main component, an adsorption method of adsorbing an odor component on an adsorbent, a cleaning method of absorbing an odor component by a cleaning liquid (acid, alkali, water) by bringing an exhaust gas containing an odor component into contact with a gas-liquid of the cleaning liquid, and the like can be suitably used.

Although the regeneration gas flowing through the exhaust lines 36 and 146 is exhausted to the outside air, the exhaust line may exhaust the regeneration gas to a predetermined gas line without being limited to the outside air.

In the powder and granular material processing apparatuses 1 and 101, a dry gas and a regeneration gas using an inert gas may be used instead of the dry gas and the regeneration gas.

In addition, various design changes can be made to the above-described configuration within the scope of the matters described in the claims.

Description of the reference numerals

1. 101 powder processing device

11. 111 drying hopper (containing part)

13. 113 drying pipeline

16. 116 aftercooler (drying and regenerating heat exchanger)

18. 118 adsorption part

19. 119 drying heater (heating part)

34. 144 regeneration pipeline

91 deodorization device (gas treatment part)

94. 192-f low-temperature catalyst

95 aftercooler (exhaust and regeneration heat exchanger)

127 hydrophilic adsorbent (moisture adsorbent)

128 hydrophobic adsorbent (adsorbent material for other components)

195 exhaust gas and regeneration heat exchanger.

Claims

1. A powder processing apparatus comprising:

a drying line through which a drying gas flows;

a regeneration line through which a regeneration gas flows;

a housing part provided in the drying line for housing the powder;

A heating unit configured to heat the drying gas flowing through the drying line to the accommodating unit;

an adsorption unit configured to have a drying region through which a drying gas flowing through the drying line to the storage unit passes and a regeneration region through which a regeneration gas flowing through the regeneration line passes, and to adsorb moisture contained in the drying gas passing through the drying region to an adsorbent, and to regenerate the adsorbent by depriving the adsorbent of moisture by the regeneration gas in the regeneration region;

and a gas treatment unit connected to a downstream end of the regeneration line, and configured to decompose the regeneration gas from the regeneration line and discharge the decomposed regeneration gas.

2. A powder processing apparatus according to claim 1, wherein,

in the adsorption unit, as the adsorption material, a moisture adsorption material for adsorbing moisture contained in the dry gas and an adsorption material for adsorbing other components other than moisture contained in the dry gas are used together.

3. A powder processing apparatus comprising:

a drying line through which a drying gas flows;

a regeneration line through which a regeneration gas flows;

A housing part provided in the drying line for housing the powder;

an adsorption unit that includes a hydrophilic adsorbent and a hydrophobic adsorbent arranged in a direction of a center line of the adsorption tube, in which a drying region through which a drying gas flowing through the drying tube to the storage unit passes and a regeneration region through which a regeneration gas flowing through the regeneration tube passes are set in a cylindrical adsorption tube, and in which moisture contained in the drying gas is adsorbed to the hydrophilic adsorbent and organic components contained in the drying gas are adsorbed to the hydrophobic adsorbent, and in which moisture is deprived from the hydrophilic adsorbent by the regeneration gas in the regeneration region, the hydrophilic adsorbent is regenerated, and organic components are deprived from the hydrophobic adsorbent by the regeneration gas, and the hydrophobic adsorbent is regenerated;

and a gas treatment unit connected to the regeneration line and configured to decompose and treat the regeneration gas from the regeneration line and then discharge the gas.

4. A powder and granular material processing apparatus as set forth in claim 3, wherein said hydrophobic adsorbent and said hydrophilic adsorbent are honeycomb structures made of zeolite.

5. A powder processing apparatus according to any one of claims 1 to 4, wherein the decomposition processing is processing by a catalyst decomposition method using a low-temperature catalyst.

6. A powder and granular material processing apparatus as set forth in claim 5, further comprising a regeneration heater provided upstream of the adsorption unit in the regeneration line and configured to heat a regeneration gas flowing through the regeneration line,

the regeneration heater is used as a catalyst heater for heating the regeneration gas flowing into the low-temperature catalyst.

7. A powder and granular material processing apparatus as claimed in any one of claims 1 to 4, further comprising an exhaust gas and regeneration heat exchanger for reducing the temperature of the exhaust gas from the gas processing unit and increasing the temperature of the regeneration gas flowing through the regeneration line by heat exchange between the exhaust gas from the gas processing unit and the regeneration gas flowing through the regeneration line.

8. A powder and granular material processing apparatus as set forth in any one of claims 1 to 4, further comprising a drying and regenerating heat exchanger configured to cool the drying gas flowing through the drying line and to warm the regenerating gas flowing through the regenerating line by heat exchange between the drying gas flowing through the drying line and the regenerating gas flowing through the regenerating line from the accommodating portion toward the adsorbing portion.

9. A powder and granular material processing apparatus as set forth in any one of claims 1 to 4, wherein the temperature of the exhaust gas from the gas processing section is 110℃or lower.

10. A powder processing apparatus according to any one of claims 1 to 4, wherein the gas processing unit is connected to a single regeneration line.

11. A powder processing apparatus according to any one of claims 1 to 4, wherein a plurality of sets of the drying line, the regeneration line, the storage portion, the heating portion, and the adsorption portion are provided in 1 set of the drying line, the regeneration line, the storage portion, the heating portion, and the adsorption portion,

the gas treatment section is commonly connected to a plurality of the regeneration lines.

12. A method for treating a powder or granular material in an apparatus including a drying line through which a drying gas flows, a regeneration line through which a regeneration gas flows, and a container portion provided in the drying line and containing the powder or granular material, the method comprising:

a heating step of heating the drying gas flowing through the drying line to the accommodating portion;

An adsorption step of adsorbing moisture contained in the drying gas flowing through the drying line to the storage unit to an adsorbent;

a regeneration step of passing a regeneration gas flowing through the regeneration line through the adsorbent to regenerate the adsorbent;

and a gas treatment step of decomposing the regeneration gas after passing through the adsorbent and then exhausting the decomposed regeneration gas.

13. A gas processing apparatus, comprising:

a gas line through which a gas flows;

a gas treatment unit connected to a downstream end of the gas line, and configured to decompose and discharge gas from the gas line;

and a heat exchange unit configured to cool the exhaust gas from the gas treatment unit and to heat the gas flowing through the gas line by heat exchange between the exhaust gas from the gas treatment unit and the gas flowing through the gas line.