Energy is an important pillar of a country’s industrial economic development. Since the reform and opening up, China has achieved a series of remarkable achievements, but at the same time as China’s rapid economic development, its energy security and energy structure are in urgent need of optimization. In 2010, China’s GDP surpassed Japan’s to rank second in the world, and in the same year, the total amount of energy consumed in China was equal to that of the United States. From the energy structure point of view, China's current energy over-reliance on raw coal, natural gas in China's primary energy consumption structure is far lower than the average world level of 23.7% and 11.1% of the average level in the Asia-Pacific region.
Among the three basic energy sources, the development of coal and petroleum has now reached a bottleneck, but the potential for natural gas development is still great. The development of the use of natural gas and the optimization of energy structure can play a dual role in ensuring energy supply and protecting the environment, and can play an important role in achieving sustainable economic and social development.
In 2012, China consumed a total of 147.1 billion cubic meters of natural gas, an increase of 13% over 2011, of which domestic natural gas output was 107.7 billion cubic meters, up 6.5% year-on-year; imported natural gas was 42.5 billion cubic meters, an increase of 31.1%. According to the “12th Five-Year Planâ€, it is expected that the share of clean energy and natural gas consumption in China's one-time energy consumption will increase to about 8% by the end of 2015.
Energy distribution map
In terms of distribution, the production of natural gas in China is mainly in the western region, while the energy application is mainly in the central and eastern regions. This involves the transport issue. At present, although China’s natural gas pipeline construction has grown rapidly, a series of backbone network projects including Phase I, Phase II, Shaanxi-Beijing Second Line, Zhongwu Gas Transmission, and Sichuan-East Gas Transmission have been completed, but pipeline construction costs are high and the construction period is high. long. Overall speaking, the speed of pipeline construction in our country is lagging behind, and the mileage is severely insufficient, which cannot meet the demand for natural gas transmission. A good way to make up for this is the liquefaction of natural gas. Moreover, another feature of China's natural gas is that the exploitation of natural gas is relatively decentralized, and the extraction volume of a single well is relatively small and cannot be integrated into existing pipelines.
Liquefied natural gas LNG is condensed into a liquid by cooling the natural gas to -162°C. Liquefied natural gas can not only greatly save storage space and costs, but also increase the volumetric energy density (equivalent to 72% of gasoline); it can also be directly used for the filling of vehicle fuel. It is understood that 1 ton of LNG is equivalent to 1495 square meters of natural gas. If a large semi-trailer LNG tanker is used for transport, a vehicle carrying 20 tons will be equivalent to a vehicle transporting 30,000 square meters of conventional natural gas. LNG gas source can not only be obtained from large LNG receiving stations, but also can be obtained from small LNG liquefaction plants across the country. Its low cost, wide coverage, easy management and strong adaptability. Moreover, LNG is still the best gas source for peaking natural gas reserves. It can be said that the key to China’s future energy is natural gas, and the key to natural gas is liquefied natural gas. In fact, some of our applications on LNG heavy trucks have taken the lead in the world.
At present, China's major heavy truck manufacturers have developed their own LNG heavy trucks, and many LNG heavy trucks not only drink natural gas, but also an important carrier for road transport LNG. Because China has a vast area, LNG gas sources often reach thousands of kilometers away from the place of use. LNG is also a high-density, low-temperature fuel. Once an accident occurs, it is likely to cause huge loss of property and lives. Therefore, the efficiency and safety of road transportation are high. The importance of sex is particularly prominent.
Shandong Heze Lvjie Natural Gas Co., Ltd. is a professional company engaged in the transportation of LNG. The company pulled LNG from Inner Mongolia, and after over 1200 kilometers of one-way long-distance transportation, it passed through Inner Mongolia, Shaanxi, Shanxi and Hebei, and eventually transported LNG back to Shandong. The transportation route is not only long, but also has complex road conditions. In particular, the roads from Inner Mongolia to Hebei are almost all mountain roads. The ratio of slope roads is very high. Especially in Luliang, Shanxi Province, there is a long downhill slope of more than 30 kilometers. There are often large trucks. Because the brakes failed to fall on the roadside. In order to solve the problem of heavy-duty trucks with long and steep slopes, the company has specifically used Dongfeng Tianlong 6*4 T43 gas-powered tractors with Voith hydraulic retarder.
Voith, Germany, is the pioneer of hydraulic retarders and the world's most important supplier of hydraulic retarders. It has manufactured and sold more than 700,000 hydraulic retarders. Voith Retarder has won Germany's Best Brand Award five times and is widely used by Mercedes, Volvo, Mann, Renault and other top trucks.
The Voith VR115CN hydraulic retarder used by Dongfeng Trucks has a maximum permissible input speed of 5,000 revolutions per minute, a rated braking torque of 3,200 Nm, and a weight of 68 kg. It is a safe and efficient continuous braking system that can be very economical. Comfortable, wear-free braking for all types of trucks. In the braking process using the retarder, the kinetic energy of the vehicle is converted into heat energy and is emitted through the heat exchanger of the retarder and the vehicle cooling system. In this way, there is no thermal degradation of the brake. The use of a retarder not only avoids the extra weight of installing a truck spray cooling device, but also eliminates the serious safety hazards caused by winter watering and road ice formation.
In the past six months, the company’s vehicles have operated nearly 90,000 kilometers. According to reports, the driver only needs to set the retarder to the first gear: constant speed (downhill cruise speed), and the retarder can automatically The brake power is adjusted so that the truck can go downhill at a set speed at a constant speed. Basically, the brakes are not applied. The brakes are still cold after the following long slopes are touched. This not only greatly reduces the labor intensity of the driver, but also greatly increases the safety of the transportation, in particular, avoids the braking failure of the vehicle caused by the carbonization and failure of the brake pads resulting from prolonged use of the brakes. It is precisely because the retarder can perfectly control the speed when the truck goes downhill. The driver can drive normally when he is on a long slope without deliberately reducing the speed so as to reduce the braking load. Therefore, the average speed of the trucks on the downhill slope Both are higher than normal trucks.
In fact, the hydraulic retarder is not only used in the lower long slope, but in the flat road, 90% of the brakes can be used by the retarder. In addition, retarder braking is wear-free braking, actively using a retarder, and adjusting the vehicle speed with different gears of the retarder, which can effectively protect the brake pads and tires. During the maintenance of the vehicle by Greenclean, the maintenance personnel obviously felt that they installed a Voith Retarder truck. Their brake pads wear much lighter than other vehicles, so the service life of the brake pads is greatly extended.
What Green Watch cares most is also the safety brought by retarder for long-distance road transport LNG. With the continuous development of China's industrial economy and the continuous increase in the proportion of natural gas in China's primary energy use, it can be predicted that there will be more LNG road transport demand in the future. The safety of LNG road transport, which is an important basic energy source, is not only related to transport itself, but also a guarantee for the people’s livelihood and economic security.
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