New method for controlling combustion in a grate boiler

Research output: Contribution to conferenceConference articleScientific

Abstract

The control of disturbances due to fuel quality variation is important development area in the grate combustion technology.
Main challenges in the control of the grate combustion are inhomogeneous fuel, variation in fuel moisture content, non-uniform distribution of fuel on the grate area and high percentage of combustibles in ash.
Information on events which occur in the furnace plays an important role in controlling of the grate combustion process. As the direct indicators of the combustion efficiency are not usually available, efficiency estimation reveals an important and challenging problem.
In this article we propose a new measurement method to estimate combustion on the grate and consider aspects of its application. The purpose was to find regularities in the behaviour of the measurements and to analyse the reliability and the utilization of the measurements.
The method is based on combining information obtained from the fuel bed pressure signals and the grate temperature measurement signals.
Furthermore, besides information of the new measurements, the normal combustion measurements at the power plant were also taken into account. Online aspect of the new measurements receives special emphasis as the estimates of combustion efficiency should be available in real-time for the control purposes.
The share of biomass (e.g forest residue and agro biomass) increases in the power plants due to their environmentally friendly and domestic character. It means that there will be a high importance to develop new effective methods to control the combustion process in the future.
The method was tested at a combined heat and power plant 17 MWth combusting spruce bark. The new measurements give useful information on combustion on the grate.
Especially by studying the pressure difference it was possible to notice variation in fuel quality.
Combustion and ignition front location could be estimated by analysing simultaneously both pressure difference and temperature measurements.
Changes in fuel bed height and combustion rate in the outermost circles of the grate were easy to spot
Original languageEnglish
Number of pages8
Publication statusPublished - 2013
MoE publication typeNot Eligible
Event18th Nordic Process Control Workshop, NPCW 2013 - Oulu, Finland
Duration: 20 Aug 201323 Aug 2013

Conference

Conference18th Nordic Process Control Workshop, NPCW 2013
Abbreviated titleNPCW 2013
CountryFinland
CityOulu
Period20/08/1323/08/13

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Boilers
Ashes
Temperature measurement
Power plants
Biomass
Cogeneration plants
Ignition
Furnaces
Moisture

Cite this

Jegoroff, M., Leino, T., & Heiskanen, V-P. (2013). New method for controlling combustion in a grate boiler. Paper presented at 18th Nordic Process Control Workshop, NPCW 2013, Oulu, Finland.
Jegoroff, Mikko ; Leino, Timo ; Heiskanen, Veli-Pekka. / New method for controlling combustion in a grate boiler. Paper presented at 18th Nordic Process Control Workshop, NPCW 2013, Oulu, Finland.8 p.
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title = "New method for controlling combustion in a grate boiler",
abstract = "The control of disturbances due to fuel quality variation is important development area in the grate combustion technology. Main challenges in the control of the grate combustion are inhomogeneous fuel, variation in fuel moisture content, non-uniform distribution of fuel on the grate area and high percentage of combustibles in ash. Information on events which occur in the furnace plays an important role in controlling of the grate combustion process. As the direct indicators of the combustion efficiency are not usually available, efficiency estimation reveals an important and challenging problem. In this article we propose a new measurement method to estimate combustion on the grate and consider aspects of its application. The purpose was to find regularities in the behaviour of the measurements and to analyse the reliability and the utilization of the measurements. The method is based on combining information obtained from the fuel bed pressure signals and the grate temperature measurement signals. Furthermore, besides information of the new measurements, the normal combustion measurements at the power plant were also taken into account. Online aspect of the new measurements receives special emphasis as the estimates of combustion efficiency should be available in real-time for the control purposes. The share of biomass (e.g forest residue and agro biomass) increases in the power plants due to their environmentally friendly and domestic character. It means that there will be a high importance to develop new effective methods to control the combustion process in the future. The method was tested at a combined heat and power plant 17 MWth combusting spruce bark. The new measurements give useful information on combustion on the grate. Especially by studying the pressure difference it was possible to notice variation in fuel quality. Combustion and ignition front location could be estimated by analysing simultaneously both pressure difference and temperature measurements. Changes in fuel bed height and combustion rate in the outermost circles of the grate were easy to spot",
author = "Mikko Jegoroff and Timo Leino and Veli-Pekka Heiskanen",
year = "2013",
language = "English",
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Jegoroff, M, Leino, T & Heiskanen, V-P 2013, 'New method for controlling combustion in a grate boiler' Paper presented at 18th Nordic Process Control Workshop, NPCW 2013, Oulu, Finland, 20/08/13 - 23/08/13, .

New method for controlling combustion in a grate boiler. / Jegoroff, Mikko; Leino, Timo; Heiskanen, Veli-Pekka.

2013. Paper presented at 18th Nordic Process Control Workshop, NPCW 2013, Oulu, Finland.

Research output: Contribution to conferenceConference articleScientific

TY - CONF

T1 - New method for controlling combustion in a grate boiler

AU - Jegoroff, Mikko

AU - Leino, Timo

AU - Heiskanen, Veli-Pekka

PY - 2013

Y1 - 2013

N2 - The control of disturbances due to fuel quality variation is important development area in the grate combustion technology. Main challenges in the control of the grate combustion are inhomogeneous fuel, variation in fuel moisture content, non-uniform distribution of fuel on the grate area and high percentage of combustibles in ash. Information on events which occur in the furnace plays an important role in controlling of the grate combustion process. As the direct indicators of the combustion efficiency are not usually available, efficiency estimation reveals an important and challenging problem. In this article we propose a new measurement method to estimate combustion on the grate and consider aspects of its application. The purpose was to find regularities in the behaviour of the measurements and to analyse the reliability and the utilization of the measurements. The method is based on combining information obtained from the fuel bed pressure signals and the grate temperature measurement signals. Furthermore, besides information of the new measurements, the normal combustion measurements at the power plant were also taken into account. Online aspect of the new measurements receives special emphasis as the estimates of combustion efficiency should be available in real-time for the control purposes. The share of biomass (e.g forest residue and agro biomass) increases in the power plants due to their environmentally friendly and domestic character. It means that there will be a high importance to develop new effective methods to control the combustion process in the future. The method was tested at a combined heat and power plant 17 MWth combusting spruce bark. The new measurements give useful information on combustion on the grate. Especially by studying the pressure difference it was possible to notice variation in fuel quality. Combustion and ignition front location could be estimated by analysing simultaneously both pressure difference and temperature measurements. Changes in fuel bed height and combustion rate in the outermost circles of the grate were easy to spot

AB - The control of disturbances due to fuel quality variation is important development area in the grate combustion technology. Main challenges in the control of the grate combustion are inhomogeneous fuel, variation in fuel moisture content, non-uniform distribution of fuel on the grate area and high percentage of combustibles in ash. Information on events which occur in the furnace plays an important role in controlling of the grate combustion process. As the direct indicators of the combustion efficiency are not usually available, efficiency estimation reveals an important and challenging problem. In this article we propose a new measurement method to estimate combustion on the grate and consider aspects of its application. The purpose was to find regularities in the behaviour of the measurements and to analyse the reliability and the utilization of the measurements. The method is based on combining information obtained from the fuel bed pressure signals and the grate temperature measurement signals. Furthermore, besides information of the new measurements, the normal combustion measurements at the power plant were also taken into account. Online aspect of the new measurements receives special emphasis as the estimates of combustion efficiency should be available in real-time for the control purposes. The share of biomass (e.g forest residue and agro biomass) increases in the power plants due to their environmentally friendly and domestic character. It means that there will be a high importance to develop new effective methods to control the combustion process in the future. The method was tested at a combined heat and power plant 17 MWth combusting spruce bark. The new measurements give useful information on combustion on the grate. Especially by studying the pressure difference it was possible to notice variation in fuel quality. Combustion and ignition front location could be estimated by analysing simultaneously both pressure difference and temperature measurements. Changes in fuel bed height and combustion rate in the outermost circles of the grate were easy to spot

M3 - Conference article

ER -

Jegoroff M, Leino T, Heiskanen V-P. New method for controlling combustion in a grate boiler. 2013. Paper presented at 18th Nordic Process Control Workshop, NPCW 2013, Oulu, Finland.