Why is it so difficult to supply natural gas for cars now?

I transferred it. I hope I can help you ~! At present, automobile exhaust emission in some big cities in China is the main source of urban air pollution. Therefore, developing clean energy vehicles has become an urgent choice. Compressed natural gas vehicle (CNG) is welcomed by all countries because of its low energy consumption and low pollutant emission, and it is internationally recognized as the most ideal alternative energy source for vehicles. Developing natural gas vehicles is of great significance for solving environmental and energy problems. In order to protect the environment and reduce pollution, many governments have promulgated a series of laws and regulations and introduced some encouraging policies to promote the development of gas vehicles, such as formulating stricter automobile exhaust emission standards, giving preferential policies in terms of natural gas supply, automobile purchase taxes, equipment supply and gas station construction. The Energy Policy Act promulgated by the federal government of the United States in 1992 made detailed provisions on tax reduction and exemption for the purchase or modification of alternative fuel vehicles and the construction of gas filling stations, and also promulgated a tax reduction policy for the use of natural gas, and exempted natural gas companies from automobile fuel sales tax. According to the policies and laws of the federal government, more than 4 states have formulated their own policies and measures to force and encourage the use of clean fuel vehicles such as CNG, which has promoted the development of CNG vehicles and the construction of filling stations. At present, more than 4 countries in the world have gas vehicles, which are mainly distributed in Italy, New Zealand, Argentina, Brazil and other countries with rich natural gas resources and the United States, Japan and other countries with strict environmental regulations. 2. Overview of the development of natural gas vehicles in China In the mid-198s, China introduced some CNG filling station equipment and established the first CNG filling station in Sichuan. In 1993, China Petroleum and Natural Gas Corporation introduced relevant foreign technologies systematically, and in 1996, the imported technologies of gas filling station devices and automobile refitted parts were localized and standardized. In 1999, the National Clean Vehicle Action Coordination Leading Group was established, which started the promotion and application of clean energy in 12 pilot cities such as Beijing, Tianjin, Shanghai, Xi 'an and Shenzhen, and achieved unprecedented results in the promotion and application of CNG vehicles and the construction of filling stations. According to the statistics of relevant departments, as of 24, there were more than 2, natural gas vehicles and more than 7 filling stations in some areas of China. 2. Comparison of environmental and economic benefits between natural gas vehicles (CNG) and other fuels Compressed natural gas vehicles: Natural gas is compressed to 2MPa in compressed natural gas cylinders for automobiles, and then supplied to internal combustion engines through pressure reducers. Compared with gasoline, using CNG as automobile fuel has the following advantages: 1. Reducing pollution and improving the atmospheric environment: Natural gas is a clean energy source with the characteristics of high calorific value, high efficiency and little pollution, and it burns completely, and it is not easy to deposit carbon. The emissions of CO, NOx and particulates are lower than gasoline, and the exhaust pollution is obviously reduced. Vehicle exhaust is one of the main sources of urban air pollution, in which the main harmful components are carbon monoxide (C), hydrocarbons (HC), nitric oxide (NO) and nitrogen dioxide (NO2). According to relevant data, using natural gas as automobile fuel can reduce the emission of 9% CO, 9% SO2, 72% HC, 39% NOx, 24% CO2 and no dust compared with gasoline, which has a significant effect on improving the urban environment. 2. CNG vehicles have higher safety. Compared with gasoline, compressed natural gas is a relatively safe fuel. The lower explosion limit of natural gas is 5%, which is higher than that of gasoline (the lower explosion limit is L%), and the ignition point of methane is 645℃, which is 218℃ higher than that of gasoline, so it is not easy to ignite. The density of methane is low, and the relative density is about .55. The leaked gas will soon be emitted in the air, so it is difficult to form the condition of hot combustion in the natural environment. Once the compressed natural gas leaks from the storage tank or pipeline, a low temperature zone will immediately form around the leakage point, making it difficult for natural gas to burn. Therefore, CNG is a fairly safe automobile fuel. 3. It is conducive to alleviating the contradiction between supply and demand of energy shortage. China's economy is in a high-speed development stage, the number of cars is increasing at a rate of more than 1 million/year, and the demand for gasoline resources is increasing greatly. China needs to import a large number of crude oil, refined oil and LPG every year. The use of gas vehicles can be optimized. 4. The engine life can be prolonged. Natural gas is easy to diffuse and enter the engine in gaseous state, and it is easy to mix with air evenly in the engine, and the combustion is relatively complete and clean; It can improve the thermal cycle efficiency, accelerate the combustion speed and make full use of the combustion heat energy; At the same time, CNG has high octane number and good antiknock performance. When in use, it does not need to add antiknock agent and will not dilute lubricating oil, thus greatly reducing the wear of parts in the engine cylinder and greatly prolonging the life of the engine and the service life of lubricating oil. All these will reduce the maintenance and operation cost of the car, thus improving the economy of the car. 5. It has high economic benefits. At present, the domestic gasoline price continues to rise, and the price system has been in line with the world. Using CNG vehicles will save nearly 4% of fuel costs, as shown in Table 3. Third, the development prospect of CNG vehicles L, the rapid growth of car ownership, the grim situation of oil resources and environmental protection, determine that the development of natural gas vehicles has become an important way to solve energy and environmental problems. 2. During the 11th Five-Year Plan period, new clean energy vehicles have been listed in the National Medium-and Long-Term Plan for Science and Technology Development. The state will continue to organize and implement major scientific and technological projects involving various clean energy vehicles, with emphasis on supporting key technologies such as complete vehicles and spare parts, including natural gas vehicles, which will further promote the development of natural gas vehicles. 3. The large-scale development of natural gas resources and the accelerated pace of pipeline construction in China make it possible to develop CNG and filling stations. According to China's natural gas utilization plan, a large number of gas pipelines such as "West-to-East Gas Transmission" and "Shaanxi-Beijing Second Line" and city gas pipelines along the line have been built one after another in the past decade, and the infrastructure for large-scale natural gas utilization in China has been gradually improved, and natural gas filling stations will gradually form a network.

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