JP2005089029A - Pneumatic conveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic conveyer capable of successfully pneumatically conveying moisture-reluctant powdered matter and reducing running cost. <P>SOLUTION: The pneumatic conveyer 10 is constructed to dehumidify discharged air to air of predetermined dew point temperature by a dehumidifier 104 of an air circulating supply system 100 and to circulate and supply the air to a blower chamber 28. The air circulating supply system 100 is provided with a dew point meter 160 and a control part 106. The dew point meter 160 measures dew point temperature of compressed air separated by a cyclone 20 and the control part 106 performs feed back control of the temperature of a heater 148 of the dehumidifier 104 to maintain dew point temperature measured by the dew point meter 160 at a desired dew point temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pneumatic transport device, and more particularly to a pneumatic transport device that transports powder that dislikes moisture to a cyclone.

  Conventionally, in a sanitary plant for pharmaceuticals, foods, etc., in order to transport powders of materials and products, air is supplied from a hopper to a transport pipe, and this is pneumatically transported to a cyclone by compressed air from a blower. Transportation equipment is in use.

In addition, an air transport device that pneumatically transports powders with high adhesion, such as sugar, salt, and titanium oxide, has been proposed (for example, Patent Document 1). This pneumatic transport device feeds compressed air into a hopper to which powder is replenished, gives suction suction force by an ejector provided in a transport pipe in the vicinity of the hopper, and pumps the powder in the hopper toward the cyclone. Is.
JP 2001-315961 A

  However, in the pneumatic transport device of Patent Document 1, for example, during the pneumatic transportation of a powder that dislikes moisture such as salt and glutamic acid, the powder absorbs the moisture in the compressed air and aggregates and adheres to the transport pipe. There was a problem of doing.

  This invention is made | formed in view of such a situation, and it aims at providing the pneumatic transport apparatus which can carry out air transport of the powder which dislikes a water | moisture content favorably, and can reduce running cost.

  In order to achieve the above object, the present invention supplies the powder in the hopper to a transport pipe by a rotary feeder and also supplies the transport pipe with compressed air from a blower, and transports the powder by the compressed air. In an air transportation device that pneumatically transports to a cyclone via a pipe, the compressed air separated by the cyclone is dehumidified to air having a predetermined dew point temperature by a dehumidifier, and the air is circulated and supplied to the blower. A dew point meter for detecting a dew point temperature of the compressed air separated by the cyclone, and a dew point temperature measured by the dew point meter at a desired dew point temperature. A control unit for controlling the dehumidifying device is provided.

  According to the present invention, air controlled to a predetermined dew point temperature is supplied to the blower, and powder is pneumatically transported using this air, so that air transportation is favorably performed without deteriorating or agglomerating the powder that dislikes moisture. it can.

  In the present invention, the compressed air separated by the cyclone of the pneumatic transportation device is dehumidified into air having a predetermined dew point temperature by the dehumidifying device, and the air circulation supply system for circulating the air to the blower is provided. Further, this air circulation supply system is provided with a dew point meter and a control unit. The dew point meter detects the dew point temperature of the compressed air separated by the cyclone, and the control unit is measured by the dew point meter. The heater temperature of the dehumidifier is controlled so that the dew point temperature becomes a desired dew point temperature. As a result, dry air having a desired dew point temperature is always supplied to the blower, so that powder that dislikes moisture can always be pneumatically transported stably. Further, since air is circulated and used by the air circulation supply system, it is possible to reduce the addition to the dehumidifying device, thereby reducing the running cost of the air transport device.

  Further, according to the present invention, the dew point temperature of the air controlled by the control unit is set to −60 ° C. to −40 ° C. in order to prevent deterioration and aggregation due to moisture absorption of the powder. Thereby, it is suitable for a pneumatic transport apparatus that pneumatically transports glutamic acid that is soluble in moisture and a salt that easily absorbs and aggregates moisture.

  According to the pneumatic transport apparatus of the present invention, dry air controlled to a predetermined dew point temperature is supplied to the blower, and the powder is pneumatically transported using this air, so that the powder that dislikes moisture is altered or aggregated. Good air transportation without any problems. Further, in the present invention, since air having a desired dew point temperature supplied to the blower is circulated and used by the air circulation supply system, the running cost for the air transportation device can be reduced. Furthermore, in the present invention, since the dew point temperature of the dry air supplied to the blower is set to −60 ° C. to −40 ° C., it is possible to provide an air transport device that pneumatically transports glutamic acid that dissolves in water and salts that easily absorb water and aggregate. Is preferred.

  Hereinafter, preferred embodiments of a pneumatic transportation device according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view of the entire system showing an air transportation device 10 and an air circulation supply system 100 provided in the air transportation device 10.

  The pneumatic transport device 10 supplies the powder in the hopper 12 (powder that does not like moisture, such as glutamic acid, salt, sugar, etc.) to the transport pipe 16 while controlling the supply amount by the rotary feeder 14, and this transport pipe. 16 is a device that supplies dry compressed air from a blower 18 to 16 and pneumatically transports the powder to the cyclone 20 via a transport pipe 16 by this compressed air.

  The powder that has been pneumatically transported to the cyclone 20 is separated from the air by the cyclone 20 and collected in a receiving tank (not shown) connected to the lower part of the cyclone 20. The air separated by the cyclone 20 is sucked into the bag filter device 22 through the pipe 26 by the suction fan 24 of the bag filter device 22 which is a dust collector, and the fine powder contained in the air is removed from the bag filter. Removed by device 22. Thereafter, the air is dried to a predetermined dew point temperature by passing through the air circulation supply system 100 and returned to the blower chamber 28. Then, the air is sucked into the blower 18 and reused as dry compressed air for pneumatic transportation.

  The air circulation supply system 100 is provided with an air conditioner 102, a dehumidifier 104, and a control unit 106. The air circulation supply system 100 first cools and dehumidifies the air exhausted from the bag filter device 22 by the air conditioner 102, and then dehumidifies it to air having a desired dew point temperature by the dehumidifier 104. This is a circulation system that returns to the chamber 28.

  The air conditioner 102 is configured by arranging a first cooler 110, a second cooler 112, and an air conditioner fan 114 in a case 108 in which an air flow path is formed. The outside air is introduced into the case 108 from the air inlet 116, and the contained moisture is removed by the first cooler 110 and the second cooler 112 when passing through the case 108. Air from the bag filter device 22 is introduced into the case 108 from the return air inlet 120 through the return air duct 118. The introduced exhaust air is supplied between the first cooler 110 and the second cooler 112, mixed with the air (outside air) that has passed through the first cooler 110, and passes through the second cooler 112. The mixed air that has passed through the second cooler 112 is sucked by the air conditioner fan 114 and supplied from the air outlet 122 to the dehumidifier 104 through the air duct 124.

  The dehumidifier 104 is configured by housing a rotating dehumidifying rotor 128 in a case 126 formed in a cylindrical shape. The inside of the case 126 is divided into a dehumidifying part 132 and a reproducing part 134 by a partition plate 130. Part of the air supplied from the air conditioner 102 via the air duct 124 is supplied to the dehumidifying unit 132, and is dehumidified by the rotating dehumidifying rotor 128 when passing through the dehumidifying unit 132. Further, the dehumidifying rotor 128 that has been used for dehumidification is regenerated when it rotates and passes through the regenerating unit 134 and is again used for dehumidification.

  The dehumidifying rotor 128 is formed by forming a honeycomb-like nonwoven fabric impregnated with a dehumidifying agent such as lithium chloride or silica gel into a rotor shape, and is driven to rotate by a motor (not shown).

  An after cooler 136 is disposed in the dehumidifying unit 132 at a position subsequent to the dehumidifying rotor 128. The air supplied from the air conditioner 102 via the air duct 124 is introduced into the dehumidifying unit 132 from the air introduction port 138. The air introduced into the dehumidifying part 132 is dehumidified when passing through the dehumidifying rotor 128. The air dehumidified by the dehumidifying rotor 128 is cooled by the aftercooler 136 and then supplied from the air outlet 140 to the blower chamber 28 via the air supply duct 142.

  The regeneration unit 134 is divided into a regeneration zone 134A and a purge zone 134B by a partition plate 144. A part of the air cooled by the air conditioner 102 is supplied from the regeneration air inlet 146 to the purge section 134B via the branch air duct 124A branched from the air duct 124. The air supplied to the purge zone 134B passes through the dehumidification rotor 128 to cool the dehumidification rotor 128, and is then introduced into the regeneration zone 134A.

  The air introduced into the regeneration zone 134A is heated by a heater 148 installed in the regeneration zone 134A. The deheated rotor 128 is regenerated by the overheated air passing through the dehumidified rotor 128.

  The air that has passed through the dehumidifying rotor 128 is exhausted from the regeneration air outlet 150, is sucked into the regeneration duct 152 by the regeneration fan 154, and is guided to the regeneration air return air port 156. Then, the air is returned from the regeneration air return port 156 into the regeneration unit 134 and mixed with the air before being heated by the heater 148. An exhaust duct 158 is connected to the regeneration duct 152. By opening and closing a damper (not shown) provided in the exhaust duct 158, a part of the exhausted air is exhausted to the outside air. The

  Next, the operation of the air circulation supply system 100 configured as described above will be described.

  First, the dehumidifying rotor 128 is rotationally driven, and the air conditioner fan 114 and the regeneration fan 154 are rotationally driven. The outside air introduced into the air conditioner 102 passes through the first cooler 110 and the second cooler 112 by being sucked by the air conditioner fan 114 in the case 108. And it cools when passing the 1st cooler 110 and the 2nd cooler 112, and the moisture contained is removed.

  On the other hand, the exhaust air exhausted from the bag filter device 22 is supplied into the air conditioner 102 from the return air inlet 120 via the return air duct 118 by the suction force of the air conditioner fan 114. The exhaust air introduced from the return air inlet 120 is supplied between the first cooler 110 and the second cooler 112 and is mixed with the outside air that has passed through the first cooler 110. The mixed air passes through the second cooler 112 and is dehumidified from the air outlet 122 to a dew point temperature of about −10 ° C. and supplied from the air duct 124 to the air conditioner 102.

  The air supplied from the air duct 124 to the dehumidifying part 132 of the dehumidifier 104 is dehumidified in the process of passing through the dehumidifying rotor 128, and thereafter cooled by the aftercooler 136, and then has a dew point temperature of about −60 ° C. from the air outlet 140. Dry air is supplied from the supply duct 142 to the blower chamber 28.

  Further, part of the air from the air duct 124 is supplied to the regeneration air inlet 126 of the dehumidifier 104 via the branch duct 124A. The dehumidification rotor 128 is cooled in the process of being introduced into the purge zone 134B from the regeneration air inlet 126 and passing through the purge zone 134B.

  The air that has cooled the dehumidifying rotor 128 is directly introduced into the regeneration zone 134 </ b> A and heated by the heater 148. When the heated air passes through the dehumidification rotor 128, the dehumidification rotor 128 is regenerated.

  As described above, the air circulation supply system 100 dries the blower chamber 28 by supplying the blower chamber 28 with the dry air dehumidified to a predetermined dew point temperature by the dehumidifier 104. Then, the dry air supplied to the blower chamber 28 is sucked into the blower 18 and reused as air conveying air of the air transport device 10. Thereby, the powder which dislikes moisture can be stably pneumatically transported.

  In addition, a dew point meter 160 is provided in the air duct 118 of the air circulation supply system 100, and the dew point temperature of the air in the air duct 118 is measured by the dew point meter 160. The measured dew point temperature information is constantly transmitted to the control unit 106, and the control unit 106 determines the temperature of the heater 148 of the dehumidifier 104 so that the dew point temperature measured by the dew point meter 160 becomes a desired dew point temperature. Feedback control. As a result, dry air having a desired dew point temperature is circulated and supplied to the blower chamber 28 at all times, so that powder that dislikes moisture can always be stably pneumatically transported.

  Furthermore, since the air used for the air transport device 10 is circulated and used by the air circulation supply system 100, the load applied to the dehumidifier 104 can be reduced, and thereby the running cost for the entire air transport device 10 can be reduced.

  In addition, the dew point temperature of the dry air controlled by the control unit 106 is set to −60 ° C. to −40 ° C. in order to prevent deterioration and aggregation due to moisture absorption of the powder, thereby absorbing glutamic acid and water soluble in water. Therefore, it is suitable for the pneumatic transportation apparatus 10 that pneumatically transports the salt that easily aggregates.

Overall configuration diagram of pneumatic transport device and air circulation supply system of embodiment

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Air transport apparatus, 12 ... Hopper, 14 ... Rotary feeder, 16 ... Transport piping, 18 ... Blower, 20 ... Cyclone, 22 ... Bag filter apparatus, 28 ... Blower chamber, 100 ... Air circulation supply system, 102 ... Air conditioner 104 dehumidifier 106 control unit

Claims (2)

Pneumatic transport device for supplying powder in hopper to transport pipe by rotary feeder, supplying compressed air from blower to the transport pipe, and pneumatically transporting the powder to cyclone through the transport pipe by the compressed air In
An air circulation supply system is provided that dehumidifies the compressed air separated by the cyclone into air having a predetermined dew point temperature by a dehumidifier, and circulates the air to the blower.
The air circulation supply system controls a dew point meter that detects the dew point temperature of the compressed air separated by the cyclone, and the dehumidifying device so that the dew point temperature measured by the dew point meter becomes a desired dew point temperature. A pneumatic transport apparatus comprising a control unit for performing the above operation.   2. The pneumatic transport device according to claim 1, wherein the dew point temperature of the air controlled by the control unit is set to −60 ° C. to −40 ° C. in order to prevent deterioration due to moisture absorption of the powder. .

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