湿法烟气脱硫和湿式电除尘器对燃煤电厂颗粒物和二氧化硫排放的影响,Energy & Fuels

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湿法烟气脱硫和湿式电除尘器对燃煤电厂颗粒物和二氧化硫排放的影响
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-11-19 , DOI: 10.1021/acs.energyfuels.0c03222
Fuxin Yang ₁ , Hexin Liu ₁ , Peng Feng ₁ , Zhenghong Li ₁ , Houzhang Tan ₁

Affiliation

湿法烟气脱硫（WFGD）和湿法静电除尘器（WESP）在燃煤电厂（CFPPs）中广泛用于污染物控制。在这项工作中，PM ₁₀（空气动力学直径小于10μm的颗粒物，与PM ₁和PM _2.5相似），硫氧化物（SO _x，主要是SO ₂和SO ₃）和水的排放特性研究了两种CFPP中WFGD和WESP颗粒中的可溶性离子。其中一台CFPP装有一台用于脱硫工艺的吸收塔（一级WFGD，称为A厂），另一台则装有两台串联的吸收塔（两级WFGD，称为B厂）。SO ₃一阶段WFGD的去除效率为27.3％，两阶段WFGD的去除效率为81.6％。WFGD和WESP在₁₀号纸机上的去除效率分别为64.0–70.3和57.5–79.2％。WFGD对粒度分布（PSD）有很大影响。一级和二级WFGD后，直径为0.021–0.365和0.021–1.620μm的颗粒浓度显着增加。在工厂A中，直径为0.02–2.5μm的PM上WESP的去除效率为68.8–74.3％，当直径大于2.5μm时，去除率降至57.2–58.5％。此外，WESP后PSD的峰值从2μm移至4.0μm。而去除效率随植物B的粒径而增加。SO ₄^2–，Cl的水溶性离子浓度^-，并且脱硫过程后PM _10中的Mg ²⁺急剧增加，但在WESP中所有检测到的离子均减少了50％。研究了阴离子和阳离子平衡的化学计量分析。WFGD之前的阳离子当量/阴离子当量值小于1，WFGD和WESP之后的阳离子当量/阴离子当量值大于1。最终排放时PM ₁，PM _2.5，PM ₁₀，SO ₂和SO ₃的排放因子在5.3-15.4、7.6-20.1、15.9-21.7、105.3-179.6和30.1-49.4 g· t ^–1分别。

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Effects of Wet Flue Gas Desulfurization and Wet Electrostatic Precipitator on Particulate Matter and Sulfur Oxide Emission in Coal-Fired Power Plants

Wet flue gas desulfurization (WFGD) and wet electrostatic precipitator (WESP) are widely used in coal-fired power plants (CFPPs) for pollutants control. In this work, the emission characteristics of PM₁₀ (particulate matter (PM) with aerodynamic diameter less than 10 μm, similarly for PM₁ and PM_2.5) and sulfur oxides (SO_x, mainly SO₂ and SO₃) and the water-soluble ions in particles were investigated for WFGD and WESP in two CFPPs. One of the CFPPs was equipped with one absorption tower for the desulfurization process (one-stage WFGD, named as plant A), and the other one was equipped with two absorption towers in series (two-stage WFGD, named as plant B). SO₃ removal efficiencies were 27.3% in one-stage WFGD and 81.6% in two-stage WFGD. The removal efficiencies of WFGD and WESP on PM₁₀ were 64.0–70.3 and 57.5–79.2%, respectively. WFGD had a great effect on particle size distributions (PSDs). The concentrations of particles with diameters of 0.021–0.365 and 0.021–1.620 μm showed a significant increase after one-stage and two-stage WFGD, respectively. In plant A, the removal efficiencies of WESP on PM with diameters of 0.02–2.5 μm were 68.8–74.3%, and the efficiencies decreased to 57.2–58.5% when the diameter was larger than 2.5 μm; moreover, the peak of PSDs shifted from 2 to 4.0 μm after WESP; while the removal efficiency increased with the particle size in plant B. The water-soluble ion concentrations of SO₄^2–, Cl^–, and Mg²⁺ in PM₁₀ increased dramatically after the desulfurization process, but all the detected ions were reduced by 50% in WESP. The stoichiometric analysis on the balance of anion and cation was studied. The values of cation equivalent/anion equivalent was less than 1 before WFGD and larger than 1 after WFGD and WESP. The emission factors of PM₁, PM_2.5, PM₁₀, SO₂, and SO₃ at the final emission were in the range of 5.3–15.4, 7.6–20.1, 15.9–21.7, 105.3–179.6, and 30.1–49.4 g·t^–1, respectively.

更新日期：2020-12-17

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