CO(2) Recovery: Improved Performance with a Newly Developed System
Peer-Reviewed Paper
MBAA TQ vol. 45, no. 2, 2008, pp.
84-89 |
VIEW ARTICLE
Ulrich Buchhauser (1), Jadran Vrabec (2), Martin Faulstich (1), and Roland
Meyer-Pittroff (3). 1. Institute of Resource and Energy Technology, TU M�nchen,
Freising, Germany. 2. Institute of Thermodynamics and Thermal Process
Engineering, University of Stuttgart, Stuttgart, Germany. 3. CPW Competence Pool
Weihenstephan, TU M�nchen, Freising, Germany.
Abstract
State-of-the-art CO(2) recovery systems gain up to 2�2.5 kg of CO(2) per hL of
cooled wort (CW) out of approx. 4.2 kg of CO(2) per hL of CW released during
fermentation. The system presented in this paper enables breweries to recover up
to 3.5 kg of CO(2) per hL of CW. To increase the amount of collected CO(2), it was
necessary to begin recovery earlier than the usual 24 h after the start of
fermentation. As a result, the input purity of CO(2) decreased from 99.5 to 95%.
Based on a theoretical approach using equation of state (EOS) of the ternary
mixture CO(2)+O(2)+N(2), a recovery system was developed with a 223 K fluidizing
temperature of the fermentation CO(2) to separate the additional amount of O(2). To
reach this cooling temperature, a second cooling stage with CO(2) as the cooling
agent was added to the existing cooling device of the brewery. The installed
device reached an output purity of CO(2) of 99.998%, with an O(2) concentration of 5
mg/kg.
Keywords: carbon dioxide, CO(2), CO(2) recovery, equation of state, two-stage
cooling device
S�ntesis
Sistemas de recuperaci�n de CO(2) de vanguardia pueden recuperar hasta 2�2.5 kg
de CO(2) por hL de mosto fr�o (MF), de los aprox. 4.2 kg formados durante la
fermentaci�n. El sistema presentado aqu� permite que se recupere hasta 3.5 kg de
CO(2) por hL de MF. Para aumentar la cantidad de CO(2) recuperada, fue necesario
iniciar la recuperaci�n antes de las 24 h despu�s del inicio de la fermentaci�n,
por lo que la pureza del CO(2) disminuy� de 99.5 a 95%. Se desarroll� un sistema
de recuperaci�n, utilizando ecuaciones de estado f�sico teor�ticos para la
mezcla terciaria de CO(2)+O(2)+N(2), con una temperatura de 223 K de fluidizaci�n del
CO(2) para as� separar el exceso de O(2). Para alcanzar esta temperatura, se le
agreg� al enfriador existente una segunda etapa de enfriamiento utilizando CO(2)
como medio de enfriamiento. La instalaci�n alcanz� una pureza final de 99.998%
con una concentraci�n de O(2) de 5 mg/kg.
Palabras claves: CO(2), dispositivo para enfriamiento en dos etapas,
ecuaci�n de estado f�sico, gas carb�nico, recuperaci�n de CO(2)
