Food waste dryer utilizing waste heat

Patent metadata

Field	Value
Publication number	US-10247476-B2
Application number	US-201715677031-A
Country	US
Kind code	B2
Filing date	Aug 15, 2017
Priority date	Oct 25, 2016
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

The present invention relates to an improved food waste dryer utilizing waste heat, which includes a main frame, a dryer drum with an access door, to be positioned in the main frame, and an agitator positioned in the dryer drum. The improved food waste dryer comprises: a waste heat supply unit, a heating jacket positioned on the outer surface of the dryer drum, with a hot-air inlet to receive the waste heat from the waste heat supply unit and a hot-air outlet to discharge the waste heat inside the dryer drum, and a condensation system positioned in the main frame, to remove moisture included in the interior air of the dryer drum to increase the drying efficiency of the food waste dryer utilizing waste heat.

First claim

The invention claimed is:

1. An improved food waste dryer utilizing waste heat, which is a food waste dryer to dry the food waste including a main frame ( 10 ), a dryer drum ( 20 ) with an access door ( 23 ) positioned in the main frame ( 10 ), and an agitator ( 40 ) positioned in the dryer drum ( 20 ),
the improved food waste dryer comprising:
a waste heat supply unit ( 50 ) to supply waste heat released by a waste incineration plant,
a heating jacket positioned ( 30 ) on the outer surface of the dryer drum ( 20 ) to heat the dryer drum ( 20 ), with a hot-air inlet ( 33 ) to receive the waste heat from the waste heat supply unit ( 50 ) and a hot-air outlet ( 35 ) to discharge the waste heat inside the dryer drum ( 20 ), and
a condensation system ( 60 ) positioned in the main frame ( 10 ), to remove moisture included in the interior air of the dryer drum ( 20 ) to increase the drying efficiency of the food waste dryer using waste heat,
wherein the condensation system ( 60 ) further comprises:
a plurality of condensers ( 61 ) connected to one another, to allow the movement of the interior air of the dryer drum ( 20 ),
a fan ( 63 ) positioned between the condensers ( 61 ), to transfer the interior air, and
a cooling system ( 65 ) to supply a coolant to the condensers ( 61 ) to collect the moisture from the interior air, so that the coolant of a different temperature is supplied to each of the condensers to remove the moisture of the interior air and to change the temperature of the interior air,
wherein the condensers ( 61 ) include: a first to fourth condensers ( 611 , 612 , 613 , 614 ) which are different from one another in size such that the condensation area and the moisture condensation amount of each condenser are different, the coolant supplied from the cooling system ( 65 ) passes through the first, second, third and fourth condensers ( 611 , 612 , 613 , 614 ) in order and then returns to the cooling system ( 65 ), the first condenser ( 611 ) is formed to be the largest in size, the second condenser ( 612 ) to be relatively smaller than the first condenser ( 611 ), and the fourth condenser ( 614 ) to be relatively smaller than the second largest ( 612 ) and the third condenser ( 613 ) to be the smallest,
wherein the inside temperature of the dryer drum ( 20 ) heated by the waste heat is kept at 60° C.˜70° C. and the temperature of the coolant supplied from the cooling system ( 65 ) to the first condenser ( 611 ) is 25° C.˜30° C., and the temperature of the coolant released from the third condenser ( 613 ) through the second condenser ( 612 ) is kept at 60° C., so that the interior air of the fourth condenser ( 614 ) is preheated by the coolant supplied to the fourth condenser ( 614 ), and
wherein the condensation system ( 60 ) further comprises: a condensate water purification tank ( 70 ) to purify condensate water generated from the condensers ( 61 ), the condense water purification tank ( 70 ) further includes:
a condensate water tank ( 71 ) to collect the condensate water, the condensate water collected in the condensate water tank ( 71 ) which is added with zeolite and activated carbon to purify any contamination of the condensate water, and
a deodorant tower ( 73 ) such that the condensate steam generated from the condensate water is purified to be discharged.

2. The improved food waste dryer utilizing waste heat according to claim 1 ,
wherein the condensers ( 61 ) further includes interior air guides ( 61 - 3 ), so that when the interior air passes the inside of the condensers ( 61 ), the moisture conflicts with the interior air guides ( 61 - 3 ), to increase the condensation efficiency of moisture through the coolant.

Assignees

• Ndt Eng & Aerospace Co Ltd
• Nat Univ Gyeongsang Iacf
• Industry Academic Cooperation Foundation Gyeonsang National Univ

Inventors

• Lim Ki Hyun
• Song Dae Bin
• Jung Dae Hong
• Choi Sung Min
• Yoon Jong Hyun
• Park Sang Hyun

Classifications

• F26B21/333

  by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle · CPC title

• F26B21/50

  Ducting arrangements from the source of air or other gases to the materials or objects being dried · CPC title

• F26B21/25

  partly outside the drying enclosure · CPC title

• F26B11/14 Primary

  the stirring device moving in a horizontal or slightly-inclined plane · CPC title

• F26B25/005

  Treatment of dryer exhaust gases (incineration of volatiles F26B23/022) · CPC title