Abstract
The purpose of this study was to determine a method for multi-parametric output regulation of a gasification boiler especially designed for heating or for hot water heating in buildings. A new method of regulation is offered, namely more parametric regulation via proportional-integral-derivative (PID) controllers that are capable of controlling the calculated values of pressure, temperature and fan speed. These values of pressure, temperature and fan speed are calculated in a completely new way, and calculations of setpoints for determination of optimal parameters lead to an increase in boilers efficiency and power output. Results of measurements show that changes at the mouth of the stack draft due atmospheric influences occur in times with high intensity and high frequency, while power parameters, or boiler power output amplitudes and fan speed automatically “copy” those changes proportionally due to instantaneous fan speed changes. The proposed method of regulation of the gasification boiler power output according to the technical solution enables a simple, cheap, express and continuous maintenance of high power output at low concentrations of the exhaust gases of the gasification boilers from the viewpoint of the boiler user, as well as from the perspective of development and production it allows a continuous control monitoring of these parameters.
Highlights
Fossil fuels, coal and gas are key contributors to global warming
New method of regulation is offered, namely more parametric regulation via controllers that new method of regulation is offered, namely more parametric regulation via PID controllers that are thethe calculated values of pressure, temperature and fan speed. These values are capable capableofofcontrolling controlling calculated values of pressure, temperature and fan speed. These of pressure, temperature and fan speed are calculated in a completely new way, and calculations values of pressure, temperature and fan speed are calculated in a completely new way, and calculations of setpoints for determination of optimal parameters lead to an increase in boilers efficiency and power output
A regulation block is given, where the setpoint values “w” are values are calculated for temperature, pressure and fan speed on the basis of a proprietary algorithm, and for PID controllers for each variable
Summary
Coal and gas are key contributors to global warming. One way to control climate change is to reduce the consumption of fossil fuels. Regulation fan speed is, according to the authors’ new solution, an instantaneous function of the flue gas temperature, draft and pressure of flue gases in the stack exhaust, including the associated oxygen balance of combustion. From this point of view, a sufficiently powerful balancing fan can be considered as a very important structural element. A correctly configured control, does not switch off the boiler “according to the proportional-integral-derivative (PID) algorithms”, but it switches off the boiler because a need for heat off-take is lower than required for the minimum boiler output The boiler in such case cannot reach the desired, already very relatively low output temperature, so it must be shut down and it is necessary to wait for cooling of the reverse before its new restart [2]. This method is, for gas boilers up to 100 kW, technically demanding, costly and unusable by common users [7,8,9]
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