据气体世界网2021年8月26日报道,根据伍德麦肯兹的说法,在开发液化天然气时,使用碳捕获和储存(CCS)技术可以减少25%以上的碳排放。
伍德麦肯兹高级分析师丹尼尔·托勒曼表示:“大约40%的液化天然气碳排放来自天然气液化过程。 尽管如此,从排放的角度来看,并非所有液化天然气项目都是平等的。 每个液化厂都有自己独特的排放情况,因此,减少北极液化天然气厂碳足迹的最佳方式可能与卡塔尔或澳大利亚的液化厂存在显著差异。”
托勒曼说,“减少液化天然气碳排放的主要选择包括CCS、碳补偿、减少甲烷泄漏、电气化以及可再生能源和电池的使用。 CCS可以对减少液化天然气项目的碳排放产生重要影响。 根据已采用的CCS策略,我们估计可以消除25%以上的碳排放。”
他说,“好消息是,液化天然气参与者在拥有强大的资产负债表、运营能力和油藏专业知识方面处于领先地位。 追求碳捕获与封存技术也有经济上的激励作用,因为碳排放税可以减少碳排放,有助于资产的未来保值,并能提供价格上涨。”
在LNG项目中部署CCS主要有两种方法:从储油层中捕获二氧化碳和捕获石油燃烧后产生的二氧化碳。
第一种方法,与燃烧石油后捕获二氧化碳相比,捕获储油层中二氧化碳具有显著的成本优势。
伍德麦肯兹认为,储油层CCS可以将液化天然气项目的总体碳排放强度降低25%,在某些情况下甚至可以降低50%。
第二种方法,即燃烧后CCS,涉及从液化天然气废气流中捕获二氧化碳。 这种方法可能更昂贵,但由于设计和位置的协同作用,在新建的液化天然气设施中添加燃烧后的CCS方法具有成本效益。
托勒曼补充说:“只要具体国家的立法得以推进,成本能够降低,CCS将在减少液化天然气项目的碳排放方面发挥重要作用。”
李峻 编译自 气体世界
原文如下:
CCS could have material impact align="justify"> Using carbon capture and storage (CCS) could reduce overall carbon emissions by more than 25% align="justify"> Daniel Toleman, Senior Analyst at Wood Mackenzie said: “Around 40% of the total scope 1 and 2 LNG emissions are from the process of gas liquefaction. That said, not all LNG projects are created equal from an emissions perspective. Each plant has a unique emissions profile and hence the best way to reduce the carbon footprint of an Arctic LNG plant may vary significantly from align="justify"> “The main options for reducing LNG emissions include CCS, carbon offsets, methane leakage reduction, electrification, and the use of renewables and batteries. CCS can have a material impact align="justify"> “The good news is that LNG players are well placed to lead the CCS charge, with strong balance sheets, operational capability and reservoir expertise. There are also economic incentives for pursuing CCS as reducing emissions mitigates against a carbon tax, helps future-proof the asset and can offer pricing upside.”
There are two main approaches to deploying CCS at LNG projects: capturing CO2 from the reservoir and capturing post-combustion CO2.
Approach align="justify"> Wood Mackenzie believe that Reservoir CCS can reduce the overall intensity of LNG projects by 25%, and in some cases up to 50%.
The second approach, post-combustion CCS, involves capturing CO2 from the LNG flue gas stream. This method can be more expensive, there are however cost benefits of adding post-combustion CCS to a new-build LNG facility, due to design and location synergies.
Toleman added: “CCS will play a significant role in reducing emissions from LNG projects as long as country-specific legislation progresses, and costs can be brought down.”





