SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (5): 1177-1183.DOI: 10.1016/j.cjche.2018.07.020

• Energy, Resources and Environmental Technology • 上一篇    下一篇

Study on the emission characteristics of nitrogen oxides with coal combustion in pressurized fluidized bed

Zheng Gong, Yingjuan Shao, Lei Pang, Wenqi Zhong, Chao Chen   

  1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
  • 收稿日期:2018-07-05 修回日期:2018-07-29 出版日期:2019-05-28 发布日期:2019-06-27
  • 通讯作者: Wenqi Zhong
  • 基金资助:
    Supported by the National Key R&D Program of China (2016YFB0600802) and the National Natural Science Foundation of China (51736002).

Study on the emission characteristics of nitrogen oxides with coal combustion in pressurized fluidized bed

Zheng Gong, Yingjuan Shao, Lei Pang, Wenqi Zhong, Chao Chen   

  1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
  • Received:2018-07-05 Revised:2018-07-29 Online:2019-05-28 Published:2019-06-27
  • Contact: Wenqi Zhong
  • Supported by:
    Supported by the National Key R&D Program of China (2016YFB0600802) and the National Natural Science Foundation of China (51736002).

摘要: Nitrogen oxides are one of the most significant pollution sources during coal combustion. This experimental study was conducted in a 15 kWth lab-scale pressurized fluidized bed (inner diameter=81-100 mm, H=2100 mm) firing with bituminous coals. The effects of operating parameters, including bed temperature (800℃-900℃), operating pressure (0.1-0.4 MPa), excess air level (16%-30%) and flow pattern on NOx and N2O emissions were systematically studied during the tests. During each test the interaction effects of all the operating parameters were properly controlled. The results show that most operating parameters have an opposite effect on NOx and N2O emissions, and the N2O emissions mainly depend on the bed temperature. Increasing the operating pressure can significantly suppress the fuel-N conversion to NOx but enhance its conversion to N2O. With the rise of the excess air level and fluidization number, NOx emissions grow distinctly while N2O emissions remain almost unchanged. Total nitrogen oxide emissions increase with the bed temperature while decrease with the operating pressure.

关键词: Pressurized fluidized bed coal combustion, Operating parameter, NOx, N2O

Abstract: Nitrogen oxides are one of the most significant pollution sources during coal combustion. This experimental study was conducted in a 15 kWth lab-scale pressurized fluidized bed (inner diameter=81-100 mm, H=2100 mm) firing with bituminous coals. The effects of operating parameters, including bed temperature (800℃-900℃), operating pressure (0.1-0.4 MPa), excess air level (16%-30%) and flow pattern on NOx and N2O emissions were systematically studied during the tests. During each test the interaction effects of all the operating parameters were properly controlled. The results show that most operating parameters have an opposite effect on NOx and N2O emissions, and the N2O emissions mainly depend on the bed temperature. Increasing the operating pressure can significantly suppress the fuel-N conversion to NOx but enhance its conversion to N2O. With the rise of the excess air level and fluidization number, NOx emissions grow distinctly while N2O emissions remain almost unchanged. Total nitrogen oxide emissions increase with the bed temperature while decrease with the operating pressure.

Key words: Pressurized fluidized bed coal combustion, Operating parameter, NOx, N2O