Effects of APCDs on PM emission: A case study of a 660 MW coal-fired unit with ultralow pollutants emission. (5th June 2019)

• Record Type: Journal Article
• Authors: Ruan, Renhui; Liu, Hexin; Tan, Houzhang; Yang, Fuxin; Li, Yan; Duan, Yufeng; Zhang, Sicong; Lu, Xuchao
• Is Part Of: Applied thermal engineering. Volume 155(2019)
• Page Start: 418
• Page End: 427
• Publication Date: 2019-06-05
• Subjects: Ultralow pollutants emission -- Coal-fired power plant -- APCDs -- PM -- Water-soluble ions; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2019.03.136
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Field PM sampling experiments were conducted in a 660 MW coal-fired unit with ultralow emission in China. SCR can increase PM1 by 52.11% and have 18.81% removal efficiency for PM10 . LLTe can improve the ESP performance by flue gas conditioning. WFGD can remove dust but will increase PM1 by 59.41%. The removal efficiency of PM1, PM2.5 and PM10 are 55.77–71.92% for WESP. Abstract: A 660 MW unit of a CFPP (coal-fired power plant) with ultralow pollutants emission was chosen for field experiment. The PM (particulate matter) was sampled by DLPI (Dekati low pressure impactor) at the inlet/outlet of APCDs (air pollution control devices). The removal efficiencies of PM1, PM2.5, PM10 and the concentrations of WSIs (water-soluble ions) in PM from different APCDs were obtained. The experimental results show that SCR can increase the mass concentration of PM1 by 52.11%. The concentrations of water-soluble Na +, NH4 +, Cl −, and SO4 2− in PM1 also increase. LLTe (low-low temperature economizer) can improve the PM removal efficiency of ESP (electrostatic precipitator), especially for particles in the size range of 0.1–1 μm. The removal efficiency of water-soluble Na +, NH4 +, Mg 2+, Ca 2+, Cl −, SO4 2− and NO3 − are all above 86% for ESP. WFGD (wet flue gas desulfurization) can remove SO2 and fly ash simultaneously, but will increase the mass concentration of PM1 by 59.41%. The desulfurization slurry is rich in Mg 2+, Cl − and SO4 2− which is richest in PM10 after WFGD. WESP (wet electrostatic precipitator) can further purify flue gas with high humidity and low dust concentration. Through ultralow emission retrofit, the final PM10 emission of the 660 MW unit is 2.04 mg/Nm 3 .