Technological innovation "exhaust gas" becomes treasure, carbon reduction benefits are more prominent
2023/8/18
In Shanxi Yanchang Petroleum Yulin Coal Chemical Company, the newly captured and liquefied carbon dioxide is being injected into the transport tanker, and then sent to the oil production plant 150 kilometers away, and injected into the underground oil layer at a depth of about 1,300 meters through the gas injection wellhead, thereby be permanently sealed. This is the carbon dioxide capture, utilization and storage technology abbreviated as CCUS, and it is also recognized as one of the most effective means to realize the low-carbon utilization of fossil energy.
There are a large number of oil and gas and coal chemical enterprises in northern Shaanxi, and the sources of carbon emissions are very concentrated. It has also become an area with many CCUS projects. Coal chemical companies often need a large amount of hydrogen as a raw material gas, but when hydrogen is produced, carbon dioxide is produced at the same time. The ratio of the two is almost 1:1. This is the main reason why coal chemical companies have become "big carbon emitters". With the "carbon catcher", this problem can be effectively solved. How is carbon dioxide captured? Taking this company as an example, there is a purification device in the chemical process. In this device, through specific technical processes, the carbon dioxide in the industrial waste gas is first dissolved and analyzed.
In a modern coal chemical enterprise, this series of complex chemical processes are carried out in closed boilers and pipelines without human intervention at all. Engineers only need to monitor the operation of equipment 24 hours a day through the screens in the central control room. OK. At present, Yulin Coal Chemical Company has built and put into operation a 300,000-ton carbon dioxide capture device per year. Based on the calculation that one tree absorbs 18.3 kg of carbon dioxide per year, this device is equivalent to the amount of carbon dioxide that 16.4 million trees can absorb in one year.
How does the "carbon catcher" turn carbon dioxide waste into treasure?
CCUS is a carbon dioxide capture, utilization and storage technology, and an important strategic reserve technology for reducing carbon dioxide emissions in my country. Accelerating the application of CCUS technology and the development of the industrial chain is a practical need and an important path for the energy industry to achieve the goal of "double carbon". Capturing and making liquid carbon dioxide is only the first step of CCUS. Next, the "waste gas" produced by these coal chemical enterprises will play an unexpected role in the oil production plant.
The Shaanxi-Gansu-Ningxia Basin, also known as the Ordos Basin in geology, is rich in coal and oil and gas resources. However, the underground oil layer here has poor permeability and low formation pressure. After drilling in many oil fields, the oil often cannot flow out naturally. water resources. Today, through technological breakthroughs, injecting liquid carbon dioxide into oil production plants for oil displacement has cleverly solved this problem.
In an oil production plant in Yan'an, the reporter saw that liquid carbon dioxide at minus 20°C was injected into the oil well, and the low temperature kept the outside of the pipeline valve in a frozen state all year round. At present, a 100,000-ton carbon dioxide flooding and storage project has been put into operation here. To ensure safety and containment effectiveness, engineers analyze monitoring data from the air, ground and underground on a daily basis. And the small amount of carbon dioxide produced along with the oil will be re-injected into the ground through the recycling system.
Technological innovation has provided a new path for carbon reduction, and the abundance of energy and chemical companies in northern Shaanxi has given CCUS commercial value. It is less than 200 kilometers from the carbon dioxide capture site to the utilization and storage site, which greatly reduces the transportation cost and makes the carbon reduction benefits more prominent.
As CCUS continues to mature, nearly 10 demonstration projects of various types have been completed and put into operation in northern Shaanxi. In the first half of the year alone, Shaanxi Province captured nearly 550,000 tons of carbon dioxide, of which 200,000 tons were used for oil flooding and 350,000 tons were used for conversion, which is equivalent to the amount of carbon dioxide that 30 million trees can absorb in a year. The benefits of carbon reduction have begun to show .
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