Combustion and NOx emissions characteristics of a down-fired 660-MWe utility boiler retro-fitted with air-surrounding-fuel concept

Feng Ren; Zhengqi Li; Guangkui Liu; Zhichao Chen; Qunyi Zhu

doi:10.1016/j.energy.2010.11.010

Combustion and NO_x emissions characteristics of a down-fired 660-MW_e utility boiler retro-fitted with air-surrounding-fuel concept

Feng Ren
, Zhengqi Li^*
, Guangkui Liu
, Zhichao Chen
, Qunyi Zhu

^*Corresponding author for this work

School of Energy Science and Engineering, Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

55 Scopus citations

Abstract

Air-surrounding-fuel is a well-known concept used within tangential and wall-fired boilers. Here, we report for the first time on industrial experiments performed to study the effects of this concept on a 660 MW_e full-scale down-fired boiler. Data are reported for the gas temperature distributions along the primary air and coal-mixed flows, furnace temperatures, gas compositions, for example O₂, CO and NO_x, and gas temperatures in the near-wall region. The influence of concentration control valve (CCV) opening on combustion and NO_x emission in the furnace were determined. The results show that the flame stability, temperature distribution, unburnt carbon are influenced by both concentration ratios and fuel-rich flow velocities. As CCV opening increases, NO_x emissions decrease from 2594 mg/m³ to 1895 mg/m³. Considering altogether economic benefits and environmental protection issues, 30% is the optimal value for the CCV opening.

Original language	English
Pages (from-to)	70-77
Number of pages	8
Journal	Energy
Volume	36
Issue number	1
DOIs	https://doi.org/10.1016/j.energy.2010.11.010
State	Published - Jan 2011
Externally published	Yes

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Air-surrounding-fuel
Down-fired boiler

Access to Document

10.1016/j.energy.2010.11.010

Cite this

@article{c64dd52a9d92460ba27115c0c09591ae,

title = "Combustion and NOx emissions characteristics of a down-fired 660-MWe utility boiler retro-fitted with air-surrounding-fuel concept",

abstract = "Air-surrounding-fuel is a well-known concept used within tangential and wall-fired boilers. Here, we report for the first time on industrial experiments performed to study the effects of this concept on a 660 MWe full-scale down-fired boiler. Data are reported for the gas temperature distributions along the primary air and coal-mixed flows, furnace temperatures, gas compositions, for example O2, CO and NOx, and gas temperatures in the near-wall region. The influence of concentration control valve (CCV) opening on combustion and NOx emission in the furnace were determined. The results show that the flame stability, temperature distribution, unburnt carbon are influenced by both concentration ratios and fuel-rich flow velocities. As CCV opening increases, NOx emissions decrease from 2594 mg/m3 to 1895 mg/m3. Considering altogether economic benefits and environmental protection issues, 30\% is the optimal value for the CCV opening.",

keywords = "Air-surrounding-fuel, Down-fired boiler",

author = "Feng Ren and Zhengqi Li and Guangkui Liu and Zhichao Chen and Qunyi Zhu",

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doi = "10.1016/j.energy.2010.11.010",

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T1 - Combustion and NOx emissions characteristics of a down-fired 660-MWe utility boiler retro-fitted with air-surrounding-fuel concept

AU - Ren, Feng

AU - Li, Zhengqi

AU - Liu, Guangkui

AU - Chen, Zhichao

AU - Zhu, Qunyi

PY - 2011/1

Y1 - 2011/1

N2 - Air-surrounding-fuel is a well-known concept used within tangential and wall-fired boilers. Here, we report for the first time on industrial experiments performed to study the effects of this concept on a 660 MWe full-scale down-fired boiler. Data are reported for the gas temperature distributions along the primary air and coal-mixed flows, furnace temperatures, gas compositions, for example O2, CO and NOx, and gas temperatures in the near-wall region. The influence of concentration control valve (CCV) opening on combustion and NOx emission in the furnace were determined. The results show that the flame stability, temperature distribution, unburnt carbon are influenced by both concentration ratios and fuel-rich flow velocities. As CCV opening increases, NOx emissions decrease from 2594 mg/m3 to 1895 mg/m3. Considering altogether economic benefits and environmental protection issues, 30% is the optimal value for the CCV opening.

AB - Air-surrounding-fuel is a well-known concept used within tangential and wall-fired boilers. Here, we report for the first time on industrial experiments performed to study the effects of this concept on a 660 MWe full-scale down-fired boiler. Data are reported for the gas temperature distributions along the primary air and coal-mixed flows, furnace temperatures, gas compositions, for example O2, CO and NOx, and gas temperatures in the near-wall region. The influence of concentration control valve (CCV) opening on combustion and NOx emission in the furnace were determined. The results show that the flame stability, temperature distribution, unburnt carbon are influenced by both concentration ratios and fuel-rich flow velocities. As CCV opening increases, NOx emissions decrease from 2594 mg/m3 to 1895 mg/m3. Considering altogether economic benefits and environmental protection issues, 30% is the optimal value for the CCV opening.

KW - Air-surrounding-fuel

KW - Down-fired boiler

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DO - 10.1016/j.energy.2010.11.010

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