Control Strategy for Small-Scale Wood Chip Combustion

Korpela, Timo; Björkqvist, Tomas; Lautala, P.

doi:10.3182/20090705-4-sf-2005.00023

Cited by 9 publications

(12 citation statements)

References 5 publications

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“…To increase the efficiency of combustion globally, it is necessary to introduce advanced control algorithms to these devices. The improvement the efficiency of combustion by improving the construction is already close to the limits (Yin et al, 2008, Korpela et al, 2008.…”

Section: Introductionmentioning

confidence: 83%

See 1 more Smart Citation

Neural Network Evaluation of Combustion Process for Continuous Control of Small Scale Biomass Fired Boilers

Vrána

Plaček²,

Oswald

et al. 2014

IFAC Proceedings Volumes

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Section: Introductionmentioning

confidence: 83%

“…However, the on/off control can cause process variables transitions that increase emission of harmful flue gasses and decrease the combustion efficiency. So, there is a try to replace these heuristic algorithms by the modern algorithms based on control theory (Korpela et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Neural Network Evaluation of Combustion Process for Continuous Control of Small Scale Biomass Fired Boilers

Vrána

Plaček²,

Oswald

et al. 2014

IFAC Proceedings Volumes

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“…In cases where pellet chips could be sold to the small-scale market as well as the mediumscale market (which cannot be taken for granted, as smallscale equipment is more sensitive to fluctuations in feeding rate and operated by nonprofessionals) production could be more profitable. Better control technology may make the equipment less sensitive to fluctuations [28].…”

Section: End Market and Product Transportmentioning

confidence: 99%

“…The cost of adaptation to moist fuels is a serious disadvantage, and dried fuels are therefore often preferred at small-to-medium scale [27]. Variations in fuel chip particle size (causing fluctuations in fuel feeding rate and in MC) cause serious control problems in small-to-medium-scale chip combustion [27,28]. Particle sizes above 50 mm may require more complex fuel feeding systems than augers like vibroconveyors or troughed chain conveyors [24].…”

Section: Introductionmentioning

confidence: 99%

Production Costs and Markets for Pellet Chips: Case Studies in Northern Sweden

Eriksson

Athanassiadis

Bergström

et al. 2012

International Journal of Forestry Research

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Increasing use of woody fuels requires that nontraditional types of raw materials are exploited, including logging residues and small-diameter trees. Although medium-scale combustors often use pellets, they could conceivably use dried chips of sufficiently narrow size distribution (henceforth pellet chips). The influence of the following factors on the relative cost-effectiveness of producing pellets and pellet chips was investigated for three plant sites in northern Sweden: (1) harvesting and transporting of forest residues; (2) the potential of existing energy plants to supply drying heat in periods of capacity surplus; (3) the distance to potential end-users. Data from the national forest inventory were used to estimate raw material costs. The resulting production costs were 144-176 $ per oven-dry tonnes (OD t) for pellets (27.4-33.5 $ MWh −1 ) and 143-173 $ OD t −1 (27.2-33.0 $ MWh −1 ) for pellet chips, with harvesting, forwarding, chipping, and transporting of logging residues to the sites amounting to 114-122 $ OD t −1 (21.7-23.2 $ MWh −1 ) for both fuels. Even though the differences in production costs were minor, the production of pellet chips requires significantly less electricity input per OD t of produced fuel. For cost reductions improved methods for wood fuel procurement, compacting and transporting of chips, small-scale low-temperature drying and foliage and bark separation are needed.

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“…One of the ways of improving efficiency and reducing harmful emissions is to develop effective control algorithms. [5] [6] [8] The algorithms used in automatic small-scale boilers are usually based on experience with their manual operation. Most of the algorithms were created heuristically by trial-and-error method during production of the devices.…”

Section: Introductionmentioning

confidence: 99%

Small and Medium Scale Biomass Combustion Control Possibilities

Plaček

Oswald

2013

Power and Energy / 807: Intelligent Systems and Control / 808: Technology for Education and Learning

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Biomass combustion is one of the most versatile and spread heat source for residential usage in the world. Nowadays a lot of new combustion devices in developed countries are controlled automatically. The control algorithm used in these devices is crucial in attaining optimal service economy with minimal environmental impact. This contribution deals with two ways how to implement proper control algorithms to small and medium scale boilers. The first method is by applying modern methods of controller development and the second by adapting tested algorithms from full-scale boilers. The used algorithms are implemented and tested on experimental devices based on common market products.

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Control Strategy for Small-Scale Wood Chip Combustion

Cited by 9 publications

References 5 publications

Neural Network Evaluation of Combustion Process for Continuous Control of Small Scale Biomass Fired Boilers

Neural Network Evaluation of Combustion Process for Continuous Control of Small Scale Biomass Fired Boilers

Production Costs and Markets for Pellet Chips: Case Studies in Northern Sweden

Small and Medium Scale Biomass Combustion Control Possibilities

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