{"id":4539,"date":"2022-02-21T13:51:21","date_gmt":"2022-02-21T13:51:21","guid":{"rendered":"https:\/\/riverdelta.in\/cl\/?page_id=4539"},"modified":"2022-04-07T08:22:14","modified_gmt":"2022-04-07T08:22:14","slug":"flash-drying-in-the-coffee-industry","status":"publish","type":"page","link":"https:\/\/riverdelta.in\/cl\/flash-drying-in-the-coffee-industry\/","title":{"rendered":"Flash Drying in the Coffee industry"},"content":{"rendered":"\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

Flash Drying in the Coffee industry<\/strong><\/p>

Introduction:<\/strong><\/p>

Clair Engineer\u2019s Private Limited (CEPL), got a call from client \u2013 a coffee supplier located in Andhra Pradesh and is one of the leading sellers oflisted products in coffee. The concern was regarding the re-commissioning of the de-watering and drying systems of the spent coffee production. The technical parameters are shared in Table 1.<\/p>

Here the working principle includes a Pneumatic drying system \/Flash dryer is used for drying of the spent coffee.<\/p>

The dewatered spent coffee is fed to the flash dryer from the feed hopper by a feed screw to dry up the spent coffee moisture from 65% to 35% by using the hot gases.<\/p>

Boiler exhaust gases shall be used for the drying purpose. The heat available from the Boiler is about 6, 00,000. Kcal\/hr. (As reported by VCL). The total moisture evaporated is about 1 ton.<\/p>

The hot gas entered at the bottom of the dryer below the feed point @ 180 \u00b0C. The dryer exit gas temperature will be 80 to 85\u00b0C. Then the dryer gases are vented through the bag filter for further reduction and finally after much more filtration , the gases are let out.<\/p>

Data\/ Table:<\/strong><\/p>

Table 1:The technical specifications<\/p>

Parameters<\/strong><\/p><\/td>

Description<\/strong><\/p><\/td><\/tr>

Application Details:<\/strong><\/p><\/td><\/tr>

New Application<\/p><\/td>

No<\/p><\/td><\/tr>

Method of Combustion<\/p><\/td>

Fluidized Bed Combustion<\/p><\/td><\/tr>

Combustible<\/p><\/td>

Spent wash<\/p><\/td><\/tr>

Gas cleaning system<\/p><\/td>

No<\/p><\/td><\/tr>

Dust Collector:<\/strong><\/p><\/td><\/tr>

Cleaning System<\/p><\/td>

On line, Time controlled, Pulse Jet<\/p><\/td><\/tr>

Cleaning pressure<\/p><\/td>

2.5 to 4 Bar<\/p><\/td><\/tr>

No. of Bags<\/p><\/td>

1560<\/p><\/td><\/tr>

Filter Area<\/p><\/td>

3572 m2<\/sup><\/p><\/td><\/tr>

Operating Conditions:<\/strong><\/p><\/td><\/tr>

Gas Volume<\/p><\/td>

105000 Am3<\/sup>\/h<\/p><\/td><\/tr>

A\/C Ratio<\/p><\/td>

0.49 m3<\/sup>\/m2<\/sup>min<\/p><\/td><\/tr>

Gas Temperature Count<\/p><\/td>

180 to 220\u00b0C with peak at 240\u00b0C<\/p><\/td><\/tr>

Gas Composition:<\/strong><\/p><\/td><\/tr>

H2O<\/p><\/td>

21 Vol %<\/p><\/td><\/tr>

S02<\/p><\/td>

O.18 Vol %<\/p><\/td><\/tr>

Acid Dew Point<\/p><\/td>

150-160\u00b0C<\/p><\/td><\/tr>

Water Dew Point<\/p><\/td>

50 to 55\u00b0C<\/p><\/td><\/tr>

Stops per Year<\/p><\/td>

15<\/p><\/td><\/tr>

Dust:<\/strong><\/p><\/td><\/tr>

Source<\/p><\/td>

AFBC Boiler<\/p><\/td><\/tr>

Total Dust Load<\/p><\/td>

27 g\/Nm2<\/sup><\/p><\/td><\/tr>

Agglomeration<\/p><\/td>

Moderate<\/p><\/td><\/tr>

Electrostatic Chargeability<\/p><\/td>

Low<\/p><\/td><\/tr>

Abrasion<\/p><\/td>

Low<\/p><\/td><\/tr>

Filter\u00a0 Medium:<\/strong><\/p><\/td><\/tr>

Type of Fibre<\/p><\/td>

100 % PTFE<\/p><\/td><\/tr>

Chemical Finish<\/p><\/td>

CS30<\/p><\/td><\/tr>

Weight<\/p><\/td>

700 g\/m2<\/sup><\/p><\/td><\/tr>

Permeability<\/p><\/td>

120\/dm2<\/sup>min<\/p><\/td><\/tr>

Requirements:<\/strong><\/p><\/td><\/tr>

Emission<\/p><\/td>

\u2264 50 mg\/Nm\u00b3<\/p><\/td><\/tr>

Service Life<\/p><\/td>

\u226524 months<\/p><\/td><\/tr>

Differential Pressure<\/p><\/td>

\u2264 150 mmWg<\/p><\/td><\/tr><\/tbody><\/table>

Observations:<\/strong><\/p>