Adaptive control of paste drying in spouted bed using the GPC algorithm

Abstract

Spouted bed is an equipment reasonable investigated for drying of many and different materials ranging from granules to pastes and suspensions. This work presents an implementation and tests of an advanced control strategy (GPC) on a spouted bed dryer. Water was used as the ideal paste for tests. A microcomputer PC-486 type was used to maintain humidity and temperature set points of air in the dryer by manipulating electric power of heat exchanger and paste feed flow rate. An instrumentation was set-up with different sensors, interface and final control elements for the process. The tests were carried out with pure water as ideal paste. Stability and performance analysis of the control strategy were accomplished. A stable controller was obtained which encouraged us to investigate this control strategy in the drying of other pastes too

Control of Spouted Bed Dryers

“…and temperature (T s T s T ): powder moisture was inferred by a correlation with the air humidity like in Figure 2 (Corrêa et al, 2000a;Corrêa et al, 2002); • Moisture (Y s Y s Y ) and powder production (Pr): nowadays this Pr): nowadays this Pr scheme is being investigated and some new results will be presented here; powder moisture is correlated with the bed temperature ( Figure 3).…”

“…Based on these facts we started outlining a generalpurpose control strategy employing adaptive MPC algorithm. Several promising results raised testing water (ideal paste) and homogenized eggs (Corrêa et al, 2000a;Corrêa et al, 2002). Nowadays, one of the objectives is the comparison with another non-adaptive MPC and the classical PI strategies.…”

“…The success of this controller led this technique to be widely employed in industrial plants. Corrêa et al (2000a), Corrêa et al (2000b) and Corrêa et al (2002) presented some results of this strategy implementation in the spouted bed dryer without including the optimizing control for minimum spout addressed before. The idea is to show how the adaptive and supervisory strategies implemented simultaneously were able to take the drying process near minimum conditions of spout fl ow.…”

Decentralized temperature indirect adaptive predictive control of a passive air conditioning unit

“…The predictive control algorithms based on generalized predictive control or even long range predictive control strategies have proved to be efficient, flexible and successful for industrial applications [20], [21], [22]. This strategy is associated with the recursive estimation algorithm in order to get better performance in both tracking and regulation problems.…”

Fuzzy Control System in Drying Process of Fermented Sausages

“…Therefore, the identification of a correct drying process is not a simple task, because parameters cannot be easily found, since they vary during the process. [5] During the last decade, fuzzy logic has proven its worth as a practical engineering and problem-solving tool. The fuzzy logic is ideal for modeling and controlling complex, nonlinear systems because it systematically handles ambiguity.…”