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Does humanity need carbon capture technology ?

2021-06-11   浏览量:

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作为经济快速发展的发展中国家,过去30年我国温室气体排放增长迅速,年排放量已位居世界前列。尽管我国单位GDP的能耗和温室气体排放强度呈下降趋势,但能源消耗和温室气体排放总量持续增加的趋势短期内难以扭转。作为补救措施之一,人类正在尝试将碳进行捕获、利用与封存。
 
碳捕集和储存技术的重点是通过分离、运输和储存二氧化碳到地下,减少大气中或工业废气中的二氧化碳。 碳捕集和储存技术被认为是减少二氧化碳排放和减少全球变暖的重要方法。 
 

北京师范大学一带一路学院教授、吉尔吉斯共和国前总理卓奥玛尔特·奥托尔巴耶夫(Djoomart Otorbaev)日前在中国国际电视台(CGTN)上发表两篇文章,对碳捕集技术进行了系统探讨。原文如下:

 

 

01

 

Carbon Capture Technology: Does Humanity Need It?

 

 
So far, large energy companies with experience in large-scale gas management have refrained from making significant investments in these techniques because carbon prices are still not high enough to break even carbon capture and storage technologies.
 
However, this view has been rapidly changing as investors demand from companies to improve their environmental reputations. For example, in January, Exxon Mobil Corp. pledged to spend $3 billion over the next five years in carbon capture plants. However, this amount of investment is minimal and is more of a PR attempt.
 

According to experts, removing carbon dioxide is likely to have four main routes to capture carbon dioxide: air, land, ocean and rocks. Without dwelling on all the currently discussed carbon dioxide capture projects, I will briefly mention only the most promising ones.

 

Green removal of carbon dioxide will make sense if the energy for this work is taken from renewable sources that use solar, wind or energy from water currents. To cut costs, one can use special zones on our planet where sun, wind or water flows have the highest power.
 
The main problem in capturing carbon dioxide from the air is its high cost compared to its direct interception at a source of pollution - a factory or a power plant. Now a typical station for processing atmospheric air and its purification from carbon spends for each ton from $600 to $1,000. But it is necessary to accumulate gigatonnes of gas. Therefore, experts believe that short-term special attention should be paid to removing carbon dioxide from the ocean, more precisely, from its upper layers.
 
The ocean can absorb about 85 percent of the carbon dioxide from the atmosphere. Therefore, if the concentration of carbon dioxide in the atmosphere continues to rise, the oceans will continue to absorb it.
 
The first project is relatively straightforward in terms of implementation. It can be an automated surface or submarine ship anchored in a stream of water. The ocean current drives turbine blades and generates energy used to capture gas from the atmosphere or water. Onboard the same vessel, carbon dioxide is converted into a non-volatile form – for subsequent disposal or sale. In the decomposition of dioxide into carbon and oxygen, the pressed blocks of carbon black can be dumped overboard as biologically harmless and buried on the ocean floor.
 
As a source of energy, it is advantageous to use, for example, the Gulf Stream ocean current. Note that the installation in the Drake Passage, which is the narrowest passage around Antarctica, is 4.6 times more gainful than in the Gulf Stream. However, due to storm waves and icebergs passing through the strait, it is advisable to place the vessel underwater with the ability to adjust the diving depth.
 
It is not difficult to establish that Antarctica is an ideal place to place power-generating equipment for carbon dioxide captures. It is the windiest and coldest place on Earth, with wind speeds of up to 20 m/s or more. In addition, in some areas of the continent, the average annual temperature can reach minus 60 degrees Celsius, making it easier to freeze carbon dioxide from the air.
 
Another promising method of carbon dioxide fixation is to drain fertile soils to gain access to soil air with its high concentrations, sometimes ranging from 5 to 20 percent. Preliminary analysis shows that the gas drainage of 1 square kilometer of an area can cost $200,000-300,000. Considering the 50-year service life of the plastic elements of the drainage system and capturing up to 800 tonnes of carbon dioxide annually, the unit cost of gas evolution will be $5-7.5 per tonne. At a high concentration of carbon dioxide in the air, the prices of its release would become 10 times less than at an equilibrium concentration.
 
It has now become clear that to stabilize the content of carbon dioxide in the atmosphere, in addition to limiting its emissions, special efforts will be needed to capture it. Since the private sector is not yet ready to fully invest in such technologies, practical steps will be required from the responsible world's powers to organize and finance such work. Perhaps even more critical will be international cooperation. Carbon dioxide in the atmosphere does not recognize national boundaries.
 

Source: CGTN,07-Jun-2021

 

02

 

Carbon Capture Technology: What Governments Should Do?

 

According to the Paris Agreement on climate change, to avoid catastrophic consequences for our planet, humanity needs to halve global emissions over the next decade and reach zero emissions by mid-century. As discussed in the previous article, many countries that are serious about combating climate change have already begun working on various innovative technologies for carbon capture and storage (CCS). Those technologies can reduce carbon dioxide emissions in the most harmful industrial sectors, such as burning coal, oil and gas, electricity generation, and hydrogen production, and reduce their concentration by extracting gas from the atmosphere and burying it underground or underwater.
 
To make progress in the CCS processes, one must complete a few essential tasks. First, to create an economic environment for investment either through direct incentives (grants, tax breaks, green bonds) or by determining the cost of emission reductions (emission standards, caps, and trade) to provide infrastructure for carbon transportation and storage and to develop a regulatory framework for new technologies.
 
Governments can and should stimulate low-carbon investment flows by introducing higher carbon costs that reflect pollution levels. There are different ways to establish the price of carbon. For example, in the U.S., the most progressive CCS incentive became tax breaks, encouraging capture and permanent carbon storage. Other measures include emission control systems, carbon trading, or additional carbon taxes.
 
In that area, the High-Level Commission on Carbon Pricing recommended a carbon price of $40-80 a ton by 2020 to drive a change consistent with the Paris Agreement. The International Monetary Fund recently proposed bringing the carbon price to $75 a ton by 2030, up from today's global average of $2 a ton. According to the International Energy Agency (IEA), it will be possible to capture and store more than 450 million tons of carbon dioxide at a carbon cost of $40 per ton. Most importantly, according to the Global Commission on the Economy and Climate, investments in the energy transition can support economic growth by about $26 trillion and create more than 65 million jobs by 2030 compared with business as usual.
 
According to the IEA, total energy investment totaled more than $1.8 trillion in 2019, falling about 20 percent in 2020 due to the impact of the coronavirus pandemic. With that, investments in renewable energy and energy efficiency have also declined. But according to the Global CCS Institute, total carbon capture and storage capacity has grown by a third in 2020.
 
But even this impressive growth rate will not be enough to meet global climate targets. Only 26 commercial CCS units exist globally, capable of capturing approximately 40 million tons of carbon dioxide per year, mainly associated with its use for enhanced oil recovery. However, if we include projects under construction or development, total carbon dioxide capture capacity has increased to over 110 million tons per year in 2020 from about 85 million tons in 2019.
 

Most of the experts agreed that to achieve zero emissions, the capacity of CCS must increase more than a hundredfold by 2050. Therefore, a more assertive policy to stimulate rapid investment in CCS is long overdue. At the end of last year, 65 CCS "commercial" properties worldwide were under operation, including three under construction and 13 under development. The IEA estimates that in 2020 alone, nearly $4 billion were invested in CCS projects.

 

 

According to the report, the U.S. already has the most significant number of CCS facilities in operation and continues to lead the way. For example, it hosts 12 of the 17 new commercial properties added to the overall portfolio of projects in 2020. The CCS has also evolved into a unique area of bipartisan agreement in the U.S. In addition, according to the report, the U.S. Department of Energy has spurred an increase in the list of CCS projects under development, and in 2020 it has committed or disbursed more than $270 million in co-financing agreements.

 
In addition to the increase in the carbon price under the EU emissions trading scheme, the European Commission announced in July 2021 a competition to develop new CCS technologies through their Innovation Fund worth €10 billion (about $12.2 billion). Across the channel, the UK government announced in November a 10-point zero-crossing plan that includes CCS as one of its key pillars. The announcement had £1 billion (about $14.1 billion) in funding for CCS infrastructure to store 10 million tons of carbon dioxide per year by 2030. It became the first quantitative storage target reached anywhere in the world. Two years ago, the UK and EU had achieved an essential milestone in the field of regulation in connection with the adoption of the so-called London Protocol. This interim solution allows the transboundary transport of carbon dioxide.
 
Along with electrification, hydrogen, and sustainable bioenergy, new carbon capture and storage technologies will play a critical role in the planet's ecological balance. This group of technologies will contribute to both the direct reduction of emissions and the removal of carbon dioxide from the atmosphere. Given the high cost of technology and the inability of the private sector to embark on large-scale research and development on CCS, we are all expecting authentic leadership from the governments of leading countries. There is simply no time left for the buildup and delay.
 

Source: CGTN,11-Jun-2021