Numerical simulation of vapour-aerosol dynamics in combustion processes

Jorma Jokiniemi, Mihailis Lazaridis, Kari Lehtinen, Esko I. Kauppinen

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Abstract

A computer model (ABC-code) has been constructed to describe the steady one-dimensional aerosol dynamics in combustion processes for gas and particle interactions at post-combustion conditions. The aerosol general dynamic equation has been solved numerically using a discrete-nodal point method for describing the particle size distribution. In the present model we consider those mechanisms that will affect the dynamics of alkali species after volatilisation, i.e. nucleation, condensation, coagulation, chemical reactions and deposition. The main features of the ABC code have been explained and an example calculation has been carried out for simulation of aerosol dynamics and alkali vapour behaviour in a real scale pulverised coal fired boiler. The results show that for predicting the gas phase concentrations of alkali species at different temperatures it is important to know the volatilisation of sodium, potassium, chlorine and sulphur and the formation rate of alkali sulphates in the gas phase. The initial ash size distribution determines the distribution of condensed alkalis between sub- and supermicron particle modes. The choice of the homogeneous nucleation model has some importance for the calculated submicron number size distribution. The effect of heterogeneous nucleation to initiate condensation on ash particles was negligible. The predictions of our simulation are in a qualitative agreement with the experimental results. The utilisation of the present code will lead to a better understanding of aerosol behaviour which will be of great importance for the control of toxic flue gas emissions, slagging and fouling in commercial boilers.
Original languageEnglish
Pages (from-to)429-446
Number of pages18
JournalJournal of Aerosol Science
Volume25
Issue number3
DOIs
Publication statusPublished - 1994
MoE publication typeA1 Journal article-refereed

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Alkalies
Ashes
Aerosols
combustion
Vapors
aerosol
nucleation
Nucleation
Computer simulation
volatilization
Vaporization
Gases
simulation
condensation
Condensation
ash
gas
Coal fired boilers
Particle interactions
Fouling

Cite this

Jokiniemi, Jorma ; Lazaridis, Mihailis ; Lehtinen, Kari ; Kauppinen, Esko I. / Numerical simulation of vapour-aerosol dynamics in combustion processes. In: Journal of Aerosol Science. 1994 ; Vol. 25, No. 3. pp. 429-446.
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title = "Numerical simulation of vapour-aerosol dynamics in combustion processes",
abstract = "A computer model (ABC-code) has been constructed to describe the steady one-dimensional aerosol dynamics in combustion processes for gas and particle interactions at post-combustion conditions. The aerosol general dynamic equation has been solved numerically using a discrete-nodal point method for describing the particle size distribution. In the present model we consider those mechanisms that will affect the dynamics of alkali species after volatilisation, i.e. nucleation, condensation, coagulation, chemical reactions and deposition. The main features of the ABC code have been explained and an example calculation has been carried out for simulation of aerosol dynamics and alkali vapour behaviour in a real scale pulverised coal fired boiler. The results show that for predicting the gas phase concentrations of alkali species at different temperatures it is important to know the volatilisation of sodium, potassium, chlorine and sulphur and the formation rate of alkali sulphates in the gas phase. The initial ash size distribution determines the distribution of condensed alkalis between sub- and supermicron particle modes. The choice of the homogeneous nucleation model has some importance for the calculated submicron number size distribution. The effect of heterogeneous nucleation to initiate condensation on ash particles was negligible. The predictions of our simulation are in a qualitative agreement with the experimental results. The utilisation of the present code will lead to a better understanding of aerosol behaviour which will be of great importance for the control of toxic flue gas emissions, slagging and fouling in commercial boilers.",
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Jokiniemi, J, Lazaridis, M, Lehtinen, K & Kauppinen, EI 1994, 'Numerical simulation of vapour-aerosol dynamics in combustion processes', Journal of Aerosol Science, vol. 25, no. 3, pp. 429-446. https://doi.org/10.1016/0021-8502(94)90062-0

Numerical simulation of vapour-aerosol dynamics in combustion processes. / Jokiniemi, Jorma; Lazaridis, Mihailis; Lehtinen, Kari; Kauppinen, Esko I.

In: Journal of Aerosol Science, Vol. 25, No. 3, 1994, p. 429-446.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Numerical simulation of vapour-aerosol dynamics in combustion processes

AU - Jokiniemi, Jorma

AU - Lazaridis, Mihailis

AU - Lehtinen, Kari

AU - Kauppinen, Esko I.

N1 - Project code: LVI30015

PY - 1994

Y1 - 1994

N2 - A computer model (ABC-code) has been constructed to describe the steady one-dimensional aerosol dynamics in combustion processes for gas and particle interactions at post-combustion conditions. The aerosol general dynamic equation has been solved numerically using a discrete-nodal point method for describing the particle size distribution. In the present model we consider those mechanisms that will affect the dynamics of alkali species after volatilisation, i.e. nucleation, condensation, coagulation, chemical reactions and deposition. The main features of the ABC code have been explained and an example calculation has been carried out for simulation of aerosol dynamics and alkali vapour behaviour in a real scale pulverised coal fired boiler. The results show that for predicting the gas phase concentrations of alkali species at different temperatures it is important to know the volatilisation of sodium, potassium, chlorine and sulphur and the formation rate of alkali sulphates in the gas phase. The initial ash size distribution determines the distribution of condensed alkalis between sub- and supermicron particle modes. The choice of the homogeneous nucleation model has some importance for the calculated submicron number size distribution. The effect of heterogeneous nucleation to initiate condensation on ash particles was negligible. The predictions of our simulation are in a qualitative agreement with the experimental results. The utilisation of the present code will lead to a better understanding of aerosol behaviour which will be of great importance for the control of toxic flue gas emissions, slagging and fouling in commercial boilers.

AB - A computer model (ABC-code) has been constructed to describe the steady one-dimensional aerosol dynamics in combustion processes for gas and particle interactions at post-combustion conditions. The aerosol general dynamic equation has been solved numerically using a discrete-nodal point method for describing the particle size distribution. In the present model we consider those mechanisms that will affect the dynamics of alkali species after volatilisation, i.e. nucleation, condensation, coagulation, chemical reactions and deposition. The main features of the ABC code have been explained and an example calculation has been carried out for simulation of aerosol dynamics and alkali vapour behaviour in a real scale pulverised coal fired boiler. The results show that for predicting the gas phase concentrations of alkali species at different temperatures it is important to know the volatilisation of sodium, potassium, chlorine and sulphur and the formation rate of alkali sulphates in the gas phase. The initial ash size distribution determines the distribution of condensed alkalis between sub- and supermicron particle modes. The choice of the homogeneous nucleation model has some importance for the calculated submicron number size distribution. The effect of heterogeneous nucleation to initiate condensation on ash particles was negligible. The predictions of our simulation are in a qualitative agreement with the experimental results. The utilisation of the present code will lead to a better understanding of aerosol behaviour which will be of great importance for the control of toxic flue gas emissions, slagging and fouling in commercial boilers.

U2 - 10.1016/0021-8502(94)90062-0

DO - 10.1016/0021-8502(94)90062-0

M3 - Article

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SP - 429

EP - 446

JO - Journal of Aerosol Science

JF - Journal of Aerosol Science

SN - 0021-8502

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ER -