Impact of High Concentrations of SO2 and SO3 in Carbon Capture Applications and its Mitigation

高浓度 SO2 和 SO3 在碳捕获应用中的影响及其缓解措施

• 批准号: TS/G002002/1
• 负责人: Mohamed Pourkashanian
• 金额: $ 22.17万
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2009
• 资助国家: 英国
• 起止时间: 2009 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=TS%2FG002002%2F1
• 关键词: Impact; Concentrations; SO2; SO3; Carbon

Oxy-Fuel Combustion is one of the key technologies considered for carbon capture. In recent years oxy-coal combustion with recycled flue gas has been strongly considered by the power generation industry as one of the possible options with a potential contribution to carbon dioxide mitigation strategies. CO2 emissions can be cut by the implementation of carbon capture technologies to existing boilers but the technical difficulties in implementing CO2 capture are formidable. The full-scale application of oxy-fuel technology is still under development but the production of SO3 is considered to be problematic for oxy-fuel and amine scrubbing technologies. Sorbent injection is more efficient for reducing SO3 than wet-FGD. Sorbent injection can therefore be used to advantage in series with FGD for both oxy-fuel combustion (to reduce the otherwise high concentration of SO3 - a corrosion inducing species) and for post combustion capture. In addition, interactions between mercury and other flue gas constituents are extremely complicated, and a variety of factors, including coals' chemical and mineralogical composition, combustion condition, plant configuration, other flue gas constituents, and time/temperature history of flue gas from combustion zone to stack, can affect mercury speciation in flue gas. It is believed that the transformations of mercury in post-combustion flue gas are kinetic limiting processes that involve both homogeneous gas-phase and heterogeneous reactions. The partitioning of mercury species in flue gas will depend on coal type, and mercury capture can be influenced by SO2 and SO3 concentration. Therefore the major issues concerning high concentrations of SO2 and SO3 on the performance of oxy-fuel systems including inhibition of mercury capture and whole life costs will be addressed in the project by combination of experimental and theoretical studies. The overarching goals of this project are as follows: The efficiency of sorbents in reducing SO3 will be assessed for the first time at pilot scale, previous studies having only concentrated on SO2, at conditions pertinent to oxy-fuel firing and post-combustion capture, (air firing conditions). This work will be carried out by our industrial partner. The Leeds research team will develop and validate an engineering computational code to provide a detailed engineering assessment of the potential application of oxy-fuel firing for electricity generation, and to develop an engineering capability and tool to assist with the design of oxy-fuel plants in the future.New physical models developed and validated in this project will be integrated into a commercial CFD code to predict the performance behaviour of oxy-fuel combustors and dry sorbent performance. The code will provide a useful tool for engineers to assess and optimise the SO3 removal for carbon capture application. In addition another objective of this project to be addressed by the Leeds research group is to understand the importance of gas- and solid-phase constituents in mercury oxidation reaction chemistry, and the effects of chlorine, nitrogen oxide, sulphur dioxide and ash particles on mercury oxidation will be investigated. Using the developed mercury oxidation reaction mechanism, the impact of high levels of SO2 in flue gas through anticipated interactions between Cl2 and SO2 on chlorine-promoted mercury transformation will be investigated.

全氧燃料燃烧是碳捕获的关键技术之一。近年来，发电行业强烈认为，利用回收烟气进行全氧煤燃烧是一种可能的选择，对二氧化碳减排战略有潜在贡献。通过对现有锅炉实施碳捕集技术可以减少二氧化碳的排放，但实施二氧化碳捕集的技术困难是巨大的。全氧燃料技术的全面应用仍在开发中，但对于全氧燃料和胺洗涤技术来说，SO3的生产被认为是一个问题。吸附剂注入比湿法脱硫更有效地减少SO3。因此，吸附剂喷射可以与烟气脱硫串联使用，既可以用于全氧燃料燃烧（以减少高浓度的SO3——一种引起腐蚀的物质），也可以用于燃烧后的捕获。此外，汞与其他烟气组分之间的相互作用极其复杂，煤的化学和矿物组成、燃烧条件、装置配置、其他烟气组分以及烟气从燃烧区到烟囱的时间/温度历史等多种因素都会影响烟气中汞的形态。人们认为，汞在燃烧后烟气中的转化是一个动力学限制过程，涉及均相气相和非均相反应。烟气中汞种类的分配取决于煤的类型，而汞的捕获可能受到SO2和SO3浓度的影响。因此，该项目将通过实验和理论研究相结合的方式解决高浓度SO2和SO3对全氧燃料系统性能的影响，包括抑制汞捕获和全寿命成本。该项目的总体目标如下：吸附剂减少SO3的效率将首次在中试规模上进行评估，之前的研究只集中在与全氧燃料燃烧和燃烧后捕获（空气燃烧条件）相关的条件下SO2。这项工作将由我们的工业合作伙伴进行。利兹大学的研究团队将开发并验证一个工程计算代码，为全氧燃料发电的潜在应用提供详细的工程评估，并开发一种工程能力和工具，以协助未来全氧燃料发电厂的设计。在该项目中开发和验证的新物理模型将集成到商业CFD代码中，以预测全氧燃料燃烧器的性能行为和干吸附剂的性能。该代码将为工程师评估和优化碳捕获应用中的SO3去除提供有用的工具。此外，利兹研究小组要解决的这个项目的另一个目标是了解气相和固相成分在汞氧化反应化学中的重要性，并将研究氯、氮氧化物、二氧化硫和灰颗粒对汞氧化的影响。利用开发的汞氧化反应机制，将研究通过预期的Cl2和SO2之间的相互作用，烟气中高浓度SO2对氯促进汞转化的影响。

项目成果

A Modeling Study of Mercury Transformation in Coal-Fired Power Plants

燃煤电厂汞转化的模拟研究

• 发表时间: 2010
• 作者: Kevin James Hughes

Assessment of the fate of mercury in oxy-coal combustion

汞在富氧煤燃烧中的归宿评估

• 发表时间: 2009
• 作者: Richard T Porter

Evaluation of the Performance of a Power Plant Boiler Firing Coal, Biomass and a Blend Under Oxy-fuel Conditions as a CO2 Capture Technique

作为二氧化碳捕集技术，在富氧燃料条件下燃烧煤、生物质和混合物的发电厂锅炉的性能评估

• DOI: 10.1016/j.egypro.2013.06.017
• 发表时间: 2013
• 期刊: Energy Procedia
• 作者: Szuhánszki J

LES and RANS of air and oxy-coal combustion in a pilot-scale facility: Predictions of radiative heat transfer

• DOI: 10.1016/j.fuel.2015.01.089
• 发表时间: 2015-07-01
• 期刊: FUEL
• 影响因子: 7.4
• 作者: Clements, Alastair G.;Black, Sandy;Pourkashanian, Mohamed
• 通讯作者: Pourkashanian, Mohamed