Simplification of a Mechanistic Model of Biomass Combustion for On-Line Computations

Boriouchkine, Alexandre; Jämsä‐Jounela, Sirkka‐Liisa

doi:10.3390/en9090735

Cited by 11 publications

(6 citation statements)

References 24 publications

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“…Until design practice is supported mainly by sophisticated CFD modelling, the control systems require simpler and faster models which can be used in real time operation. Several approaches can be find in literature dedicated to various grate combustion [7,8]. As it was pointed before, also object in Ostfildern has been analysed using model presented in [5].…”

Section: Models Of Biomass Combustionmentioning

confidence: 99%

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Operational experience and modelling of biomass combustion process in cogeneration systems with ORC units

et al. 2019

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Organic Rankine Cycle (ORC) technology is nowadays considered as interesting option for utilization of local biomass resources. The number of plants worldwide is constantly growing within typical range of electric power output form 0.2 to 3.0 MW. In such systems biomass combustion chambers with step or vibrating grates are used. Heat is transferred to the thermal oil in a separate spiral heat exchanger. The biggest problems in such system are variable and inaccurately predictable properties of biomass that directly influences operation of combustion equipment, and thus the performance of entire cogeneration plant. In this paper experiences from two plants are presented. The plants are located in Krosno (Poland) and in Ostfildern near Stuttgart, Germany. In the first one high quality wood chips are used whereas the second one is powered by low quality biomass with the mass ash content approaching 18%. Although similar, both plants use different strategies to control the combustion process. Long term measurements are used to develop biomass combustion models in the plants. The paper also presents results of implementation of the online optic measurement system for monitoring of biomass properties such as LHV, ash and water content.

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Section: Models Of Biomass Combustionmentioning

confidence: 99%

“…1. Approximate efficiency of biomass boiler at Krosno plant according to direct formula (8). Therefore firstly the model for operational assessment of the biomass boiler has been developed.…”

Section: Models Of Biomass Combustionmentioning

confidence: 99%

Operational experience and modelling of biomass combustion process in cogeneration systems with ORC units

et al. 2019

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“…The experimental data published by Lu [2] was chosen for assessing the overall modeling performance and accuracy. Other researchers [3][4][5][6][7][8][9][10][11][12][13] have attempted to model and numerically simulate the decomposition of biomass particles, either in isolation or in the form of particle bed, using various approaches. Generally though, the conclusion was that heat and mass transfer dominated processes-involving large particles with high heating rates-proved significantly more difficult to simulate.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Model of Biomass Combustion Physical and Chemical Processes

et al. 2021

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Identifying a modeling procedure of biomass thermal decomposition that is not only simple enough to implement and use, and computationally efficient, but also sufficiently accurate for engineering design activities, and with a spectrum of applications as broad as possible is a very difficult task. The authors propose a procedure which consists of two main stages: (a) the static modeling phase with the purpose of generating the algorithm (macro functions) that supplies a Computational Fluid Dynamics (CFD) model with specific input data (source/sink terms and local material properties) and (b) the dynamic modeling phase, where the CFD model is bi-directionally coupled to the external biomass decomposition model in the form of a User-Defined Function (UDF). The modeling approach was successfully validated against data obtained from single particle decomposition experiments, demonstrating its applicability even to large biomass particles, under high heating rates and combusting conditions.

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“…A correctly configured control, therefore, 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]. The way how the boiler will behave in a particular building, depends on many factors (heat losses, sizes of radiators, etc.).…”

Section: Introductionmentioning

confidence: 99%

“…The most common form of biomass is wood. Different processes exist that allow the transformation of biomass into desirable energy [1,2].…”

Section: Introductionmentioning

confidence: 99%

Thermal and Performance Analysis of a Gasification Boiler and Its Energy Efficiency Optimization

et al. 2017

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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.

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Simplification of a Mechanistic Model of Biomass Combustion for On-Line Computations

Cited by 11 publications

References 24 publications

Operational experience and modelling of biomass combustion process in cogeneration systems with ORC units

Operational experience and modelling of biomass combustion process in cogeneration systems with ORC units

A Numerical Model of Biomass Combustion Physical and Chemical Processes

Thermal and Performance Analysis of a Gasification Boiler and Its Energy Efficiency Optimization

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