Title:
APPARATUS FOR FEEDING AND PREHEATING THE ALUMINA
Document Type and Number:
WIPO Patent Application WO/2019/041006
Kind Code:
A1
Abstract:
An alumina feeding apparatus with heat exchanger for electrolysis cells energy recovery is disclosed. The heat exchanger is integrated into the feeder. It is designed to preheat the alumina by using the heat of the gases generated by the reduction process, that otherwise would be wasted into off gas and potroom environment. The feeder with heat exchanger is embedded into a regular alumina hopper (2). The alumina feeding is activated by a pneumatic cylinder (3). Alumina passes through the alumina heating chamber (4) reaching the dosing device (6). A crust breaker (5) is necessary to guarantee the crust opening stability. When the pneumatic cylinder acts, the alumina falls into the discharging chute (7). A gas collection cap (8) is placed over the anode cover (13). It presents a vertical sliding degree of freedom allowing for the anode (14) height variation during anode life. The gas collection cap presents a controllable false air inlet gap (12). The hot gases evolving from anodes and bath (15) are collected and directed to the gas heat transfer chambers (10) in counter flow with regard to the alumina flow. Fins (11) are placed to enhance heat transfer from off gas to alumina flow. The gases leave the heat exchanger at the top where a draft control valve (9) with a temperature sensor (1) is used to monitor and control the off gas temperature and massflow.
Inventors:
SEVERO DAGOBERTO (BR)
GUSBERTI VANDERLEI (BR)
GUSBERTI VANDERLEI (BR)
Application Number:
PCT/BR2017/050254
Publication Date:
March 07, 2019
Filing Date:
August 31, 2017
Export Citation:
Assignee:
CAETE ENGENHARIA LTDA (BR)
International Classes:
C25C3/14; C25C3/22
Domestic Patent References:
| WO2010033037A1 | 2010-03-25 |
Foreign References:
| US5324408A | 1994-06-28 | |||
| US4316732A | 1982-02-23 | |||
| GB1305070A | 1973-01-31 |
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