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Most of small-scale combustion devices firing biomass use control algorithms designed on the basis of an empirical experience. Very often, the on-off strategy is applied for heat output control linked with repetitive starts of the burning process which may be linked with some undesirable effects especially as far as emissions and efficiency are concerned. There are more reasons why such control solutions...
This paper presents work progress of advanced control development achieved on a prototype 100kW biomass-fired boiler. The aim of the research was to develop a complex control system, which provides both the basic boiler heating performance control based on the actual consumption and the optimization of operating conditions using advanced control algorithms. Thus, the resultant control system should...
There are discussed various approaches to the evaluation of variables whose values are for any reason impossible to be measured directly. For moisture evaluation of combusted fuel, several formula were previously proposed. In the investigations reported in the paper they have been examined which of them is the most suitable for the moisture inference gained in small-scale biomass fired boilers. In...
Controller tuning is one of the most important tasks of control loop design. Various control algorithms have the tuning mechanism built-in themselves. However, the most of used controllers are controllers of the PID type that contains no selftuning features; it is necessary to tune the controller manually or the selftuning features need to be added externally. Despite of the fact that many PID controller...
This paper discusses certain specific problems of small-scale biomass combustion control and their investigation. It describes development of an experimental stand based on market available boiler for wooden pellets that has been equipped with special control unit based on a PAC. In the paper is shown elimination of CO peaks appearing after periodical grate sweeping and main effort is focused on replacement...
Design of control circuits with standard PI(D) controllers is mostly focused on achieving the best control quality. Assessment of the control quality is usually based on control responses. The responses showing the smallest deviation from the desired value for the shortest time are considered to be those of the best control quality. Seldom any attention is paid to the operating conditions under which...
A dynamic model of the system consisting of four ON/OFF solenoid valves and two pneumatic artificial muscles in antagonistic connection (PAM based actuator) was designed. This model regards with different dynamic characteristics of the pneumatic artificial muscle by inflation and deflation of compressed air into or from muscle. The model was created in Matlab's Simulink environment.
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