Characteristics and reactivity of rapidly hydrated sorbent for semidry flue gas desulfurization
Abstract
The semidry flue gas desulfurization (FGD) process has many advantages over the wet FGD process for moving sulfur dioxide emissions from pulverized coal-fired power plants. Semidry FGD with a rapidly hydrated sorbent was studied in a pilot-scale circulating fluidized bed (CFB) experimental facility. The sorbent was made from lumps of lime and coal fly ash. The desulfurization efficiency was measured for various operating parameters, including the sorbent recirculation rate and the water spray method. The experimental results show that the desulfurization efficiencies of the rapidly hydrated sorbent were 1.5-3.0 times higher than a commonly used industrial sorbent for calcium to sulfur molar ratios from 1.2 to 3.0, mainly due to the higher specific surface area and pore volume. The Ca(OH){sub 2} content in the cyclone separator ash was about 2.9% for the rapidly hydrated sorbent and was about 0.1% for the commonly used industrial sorbent, due to the different adhesion between the fine Ca(OH){sub 2} particles and the fly ash particles, and the low cyclone separation efficiency for the fine Ca(OH){sub 2} particles that fell off the sorbent particles. Therefore the actual recirculation rates of the active sorbent with Ca(OH){sub 2} particles were higher for the rapidly hydrated sorbent, whichmore »
- Authors:
-
- Tsinghua University, Beijing (China). Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering
- Publication Date:
- OSTI Identifier:
- 21036890
- Resource Type:
- Journal Article
- Journal Name:
- Environmental Science and Technology
- Additional Journal Information:
- Journal Volume: 42; Journal Issue: 5; Other Information: youcf@tsinghua.edu.cn; Journal ID: ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 01 COAL, LIGNITE, AND PEAT; 20 FOSSIL-FUELED POWER PLANTS; ADSORBENTS; FLUE GAS; DESULFURIZATION; CIRCULATING SYSTEMS; FLUIDIZED BEDS; EFFICIENCY; PARAMETRIC ANALYSIS; BENCH-SCALE EXPERIMENTS; CALCIUM HYDROXIDES; CYCLONE SEPARATORS; REACTIVITY; FLY ASH; PARTICLE SIZE; SPRAYS; WATER; PORE STRUCTURE; COAL; RECYCLING
Citation Formats
Zhang, Jie, You, Changfu, Zhao, Suwei, Chen, Changhe, and Qi, Haiying. Characteristics and reactivity of rapidly hydrated sorbent for semidry flue gas desulfurization. United States: N. p., 2008.
Web. doi:10.1021/es702208e.
Zhang, Jie, You, Changfu, Zhao, Suwei, Chen, Changhe, & Qi, Haiying. Characteristics and reactivity of rapidly hydrated sorbent for semidry flue gas desulfurization. United States. https://doi.org/10.1021/es702208e
Zhang, Jie, You, Changfu, Zhao, Suwei, Chen, Changhe, and Qi, Haiying. 2008.
"Characteristics and reactivity of rapidly hydrated sorbent for semidry flue gas desulfurization". United States. https://doi.org/10.1021/es702208e.
@article{osti_21036890,
title = {Characteristics and reactivity of rapidly hydrated sorbent for semidry flue gas desulfurization},
author = {Zhang, Jie and You, Changfu and Zhao, Suwei and Chen, Changhe and Qi, Haiying},
abstractNote = {The semidry flue gas desulfurization (FGD) process has many advantages over the wet FGD process for moving sulfur dioxide emissions from pulverized coal-fired power plants. Semidry FGD with a rapidly hydrated sorbent was studied in a pilot-scale circulating fluidized bed (CFB) experimental facility. The sorbent was made from lumps of lime and coal fly ash. The desulfurization efficiency was measured for various operating parameters, including the sorbent recirculation rate and the water spray method. The experimental results show that the desulfurization efficiencies of the rapidly hydrated sorbent were 1.5-3.0 times higher than a commonly used industrial sorbent for calcium to sulfur molar ratios from 1.2 to 3.0, mainly due to the higher specific surface area and pore volume. The Ca(OH){sub 2} content in the cyclone separator ash was about 2.9% for the rapidly hydrated sorbent and was about 0.1% for the commonly used industrial sorbent, due to the different adhesion between the fine Ca(OH){sub 2} particles and the fly ash particles, and the low cyclone separation efficiency for the fine Ca(OH){sub 2} particles that fell off the sorbent particles. Therefore the actual recirculation rates of the active sorbent with Ca(OH){sub 2} particles were higher for the rapidly hydrated sorbent, which also contributed to the higher desulfurization efficiency. The high fly ash content in the rapidly hydrated sorbent resulted in good operating stability. The desulfurization efficiency with upstream water spray was 10-15% higher than that with downstream water spray. 20 refs., 7 figs., 1 tab.},
doi = {10.1021/es702208e},
url = {https://www.osti.gov/biblio/21036890},
journal = {Environmental Science and Technology},
issn = {0013-936X},
number = 5,
volume = 42,
place = {United States},
year = {Sat Mar 01 00:00:00 EST 2008},
month = {Sat Mar 01 00:00:00 EST 2008}
}