What are the environmental implications of controlling global CO2 concentrations and atmospheric emissions of SF6 gas?- SF6在线监测系统_SF6检漏仪_SF6传感器_SF6密度继电器

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What are the environmental implications of controlling global CO2 concentrations and atmospheric emissions of SF6 gas?

发布时间：2020-07-14 来源：ydlcb 浏览次数：23次

The global environmental protection situation is becoming more and more serious, and global warming is becoming more and more serious. Each of us has probably already tasted the consequences of global warming, and countries around the world are currently developing and implementing their own carbon dioxide emissions reduction plans in an attempt to "cool" the planet. Today, Weavers Xiaobian brings you an article by Mr. Lin Mengru, a scholar from Taiwan, on global carbon dioxide concentration and urban greening policies.

Carbon dioxide concentrations and the effects of global warming

Sulfur hexafluoride (SF6) gas is one of the six greenhouse gases found today. Sulfur hexafluoride gas, whose single-molecule greenhouse effect is 23,900 times that of CO2, is one of the six greenhouse gases prohibited by the Kyoto Protocol.

A large amount of sulfur hexafluoride (SF6) gas is used in the high-voltage electrical appliance manufacturing industry. Due to improper use, management or failure to recover and regenerate it in a correct way, SF6 gas and toxic decomposers produced by high-temperature arc are discharged into the atmosphere, causing pollution and destruction to the environment on which human beings depend. At the same time, it has adverse effects on the normal operation of electrical equipment and people's health.

According to statistics, the annual demand for sulfur hexafluoride gas in the domestic power industry is about 8,000 tons, and the annual waste rate is 10%, and the emissions are equivalent to 20 million tons of CO2 gas. With the rapid development of electric power industry and the improvement of technical equipment level, the demand for gas has a rapid rising trend.

Therefore, this study introduces the concept of "ecological balance in urban areas", and discusses the improvement strategies of urban space greening policies in response to global environmental issues by referring to previous international resolutions on carbon dioxide reduction and the Kyoto Protocol. The research method is mainly to measure the carbon dioxide concentration in the city, draw the distribution map of the gas in the urban space through Arc View software, and use the concentration to convert the weight formula to calculate the required green area in the urban space and formulate the green cover rate, green zoning and other norms, so as to provide a reference for urban planning and control.

The increase in carbon dioxide emissions not only causes the greenhouse effect, but also threatens the source of life on Earth - the ocean. Although humans have been putting a lot of carbon dioxide into the atmosphere, but the increase in the amount of carbon dioxide in the atmosphere is only half of the amount of human emissions, according to experts, the end of the carbon dioxide that does not enter the atmosphere is the ocean. The ocean becomes acidic because it acts like a sponge, absorbing greenhouse gases like carbon dioxide from the atmosphere, which break down in seawater and turn into acids. Since the beginning of the Industrial Revolution, the oceans have absorbed fully half of the fossil fuel carbon released into the atmosphere. At present, there is 30% more carbon dioxide than a few hundred years ago, and by the end of the century, it is likely to double or triple the previous level. Marine biologists worry about the consequences of the oceans absorbing carbon dioxide. When carbon dioxide melts into seawater, it forms a weak form of carbonic acid. For thousands of years, calcium formed in seawater from weathered continental rocks has been able to neutralize carbonic acid well, creating a delicate chemical environment suitable for life. Scientific evidence shows that this chemical balance is being disrupted by rising carbon dioxide levels and Marine life is under threat. The ocean's absorption of carbon dioxide has caused the PH of modern surface water on Earth to fall by about 0.1 compared to before the Industrial Revolution. A one unit drop in PH is equivalent to a 10-fold increase in the concentration of hydrogen ions, making the water more acidic. Unless humans drastically cut their demand for fossil fuels immediately, the PH of the oceans will drop by another 0.3 by 2100, meaning they will become increasingly acidic.

At current levels of industrial CO2 emissions, the surface waters of the oceans will become acidic by the end of the 21st century. Although this change is subtle, it will threaten some important organisms at the bottom of the ocean food chain, further threatening the shallow coral reefs that are one of the most important ecosystems on Earth. Scientific studies have shown that the acidification of the ocean will reduce the ability of certain organisms to form carbonic acid, making it difficult for these organisms to grow, and corals, shellfish, sea urchins and starfish are likely to be victims. Coral reefs could become extinct in the next few decades. Because the ocean is too acidic for coral reefs, their capacity to produce calcium will decline by 40 percent by 2065. Acidification also poses a serious threat to Marine life, especially those whose shells or bones contain calcium, and it has a ripple effect. Cod and other fish feed on plankton and shelled aquatic animals. If fish disappeared, the oceans would be flooded with creatures such as jellyfish, which could eat other kinds of plankton. The entire biological composition of the oceans would change. As a result, acidified waters will render many Marine organisms unviable, and the loss of these Marine organisms will disrupt Marine life chains, altering the ocean and altering its geochemical composition in ways that are not yet understood or predicted.

This study selected the whole Taipei city with closed terrain (basin), the Xinyi Project area in the urban design control area, and the Taipei University of Science and Technology with complete building streets to measure carbon dioxide concentration at different scales.

1. There are regional differences in the distribution of carbon dioxide concentration in Taipei City, and the concentration in some areas even far exceeds the measured value of 358ppm in Hawaii, USA in 1984, among which the area at the junction of Da 'an District and Zhongzheng District is high in Taipei City, while the concentration is low in Shilin District and Beitou District.

2. If the carbon dioxide concentration of 350ppm is used as the reduction basis, four zones are set up: below 350ppm, 350ppm~400ppm, 400ppm~440ppm, and above 440ppm. The proportion of additional greening required for districts exceeding 350ppm should be 4.88%, 8.79% and 11.72% of the land area of each district.

3. Based on the case study of the residential, commercial and office land used in Xinyi Project area to calculate the green cover rate of each district, 0.62%, 0.88% and 1.56% of the street area of each district need to be added successively. In terms of green volume (100% construction cover rate), 8.29%, 1.51% and 4.88% of the street area in high concentration area and 7.66%, 1.49% and 4.66% of the street area in low concentration area can balance the current carbon dioxide pollution and excess in each district, respectively.

The data from this study also highlight that the form and planning of "regional greening" have received little attention in the long term under the trend of carbon dioxide reduction, and the "harmonization" policy is also found in urban green space and environmental impact assessment and other regulations. Therefore, effective urban greening schemes should be actively adopted to reduce urban carbon dioxide concentration in order to meet the sustainable development goal of urban ecology.

The above is a brief overview of Mr. Lin Mengru's research on urban greening Policy in response to the global ecological trend of carbon dioxide reduction - taking Taipei City as an example, please search for the full text. Protecting the environment is everyone's responsibility, and the use of CO2 gas produced by regular manufacturers helps reduce unnecessary gas waste.