Experimental and modelling study on co-absorption of SO<sub>2</sub> and CO<sub>2</sub> during desulfurization process by flue gas cooler for oxy-fuel combustion flue gas

LIU Dunyu; WALL Terry; STANGER Rohan

doi:10.11949/j.issn.0438-1157.20180417

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Experimental and modelling study on co-absorption of SO₂ and CO₂ during desulfurization process by flue gas cooler for oxy-fuel combustion flue gas

更新时间：2025-12-10

- Experimental and modelling study on co-absorption of SO₂ and CO₂ during desulfurization process by flue gas cooler for oxy-fuel combustion flue gas
- CIESC Journal Issue 9, Pages: 4019-4029(2018)
- 作者机构：
  
  1. 上海理工大学能源与动力工程学院,上海,200093
  2. Chemical Engineering, University of Newcastle,NSW,Newcastle,Australia,2308
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180417
  CLC： Q02
- Online First：05 September 2018，
  
  Published：05 September 2018
- 稿件说明：
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LIU Dunyu, WALL Terry, STANGER Rohan. Experimental and modelling study on co-absorption of SO₂ and CO₂ during desulfurization process by flue gas cooler for oxy-fuel combustion flue gas[J]. CIESC Journal, 2018, (9): 4019-4029. DOI: 10.11949/j.issn.0438-1157.20180417.
DOI：

LIU Dunyu, WALL Terry, STANGER Rohan. Experimental and modelling study on co-absorption of SO₂ and CO₂ during desulfurization process by flue gas cooler for oxy-fuel combustion flue gas[J]. CIESC Journal, 2018, (9): 4019-4029. DOI: 10.11949/j.issn.0438-1157.20180417. DOI：

摘要

建立SO2与CO2共吸收到钠基溶液中的吸收速率模型，假设该模型中SO2的水解反应为瞬间反应；关于CO2水解反应存在两种假设：有限动力学假设和瞬间反应假设。由这两种方法计算分别获得SO2的吸收速率并与完全预混气液反应器中的的动态实验进行对比。采用瞬间反应假设可以预测反应速率的趋势，绝对反应速率误差仍然较大。而采用有限动力学假设的模拟值与实验值在pH>3吻合良好。CO2对SO2吸收速率的影响主要通过影响气相传质系数和相同pH下溶液总硫浓度产生。根据CO2存在与否对SO2吸收速率的影响，获得五个不同的相互作用pH的区间。pH>11.42时，SO2/N2吸收速率大于SO2/CO2，主要由于气相传质系数影响；7.8 < pH < 11.42时，SO2/N2的吸收速率和SO2/CO2吸收速率相似，主要由于气相传质系数和溶液总硫影响抵消；5.41 < pH < 7.8时，SO2/CO2的吸收速率相对较高，主要由于溶液总硫影响更大；2.8 < pH < 5.41时，SO2/CO2的吸收速率相对较低，主要由于气相传质系数影响；pH < 2.8时，SO2/N2和SO2/CO2吸收速率相似，主要受液相传质的控制。模拟同时获得不同pH下溶液中碳和硫相关离子的转化规律和SO2吸收速率的控制步骤，为富氧燃烧冷却塔同时脱硫设备的设计和运行提供参考。

Abstract

This paper aims to set up the theoretical model for co-absorption of SO2 and CO2 into sodium based solutions. Instantaneous reaction for SO2 hydrolysis is assumed. For the hydrolysis of CO2

there are two assumptions:finite kinetics and instantaneous reaction. Based on these two assumptions

the absorption rates of SO2 were separately calculated and compared with dynamic experiments in the well stirred reactor. The trend for the absorption rate of SO2 was well predicted by the instantaneous reaction for CO2. The relative error for the absolute rates of SO2 is high. The prediction based on the finite kinetics for CO2 hydrolysis at pH>3 agrees well with experiments. The influences of CO2 on the SO2 absorption rate is primarily through gas phase mass transfer coefficient and total sulphur concentration at the same pH. Depending on the existence of CO2 on SO2 absorption rate

five pH regimes for interaction were observed. At pH>11.42

the absorption rate of SO2/N2 is higher than that of SO2/CO2 due to the influence of gas phase mass transfer coefficient. At 7.8 < pH < 11.42

the absorption rate of SO2/N2 is similar with that of SO2/CO2 due to the counteraction of gas phase mass transfer coefficient and total sulphur in liquid. At 5.41 < pH < 7.8

the absorption rate of SO2/CO2 is higher due to the influence of total sulphur in liquid. At 2.8 < pH < 5.41

the absorption rate of SO2/CO2 is relative lower primarily due to the influence of gas phase mass transfer coefficient. At pH < 2.8

the absorption rate of SO2/N2 is similar with that of SO2/CO2 due to liquid phase controlled region. Conversion of carbon and sulphur based ions at different pH and controlling regions for SO2 absorption rate were obtained. The work provides guidance for the design and operation of flue gas cooler for oxy-fuel combustion flue gas.

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Experimental and modelling study on co-absorption of SO2 and CO2 during desulfurization process by flue gas cooler for oxy-fuel combustion flue gas

DOI：10.11949/j.issn.0438-1157.20180417

摘要

Abstract

关键词

Keywords

references

Experimental and modelling study on co-absorption of SO₂ and CO₂ during desulfurization process by flue gas cooler for oxy-fuel combustion flue gas