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It is understood that China's urban gas is mainly liquefied petroleum gas, coke oven gas, natural gas and other varieties. In the past two years, the development of coke oven gas has tended to be slow. The consumption of liquefied petroleum gas in China continues to grow. At present, China’s consumption of liquefied petroleum gas ranks third in the world. At the same time, imports account for 30% of total consumption, and imports rank second in the world. In the first quarter of 2007, China imported 1.708 million tons of liquefied petroleum gas, an increase of 48.7% over the same period of 2006. China's natural gas resources are limited. The gap in 2010 is estimated to be 20 billion cubic meters. The Mid-term Plan for China's Urban Natural Gas Utilization (2006-2010) pointed out that China will need 41.377 billion cubic meters of natural gas in 2010. With the continuous tightening of international energy resources, it is not a long-term solution to rely on imports to solve the problem of urban gas supply. Therefore, it is of positive significance to develop new types of urban gas based on the domestic market. Due to the imminent implementation of China's "Dimethyl Ether from Town Gas" standard, dimethyl ether will have legal status as an alternative fuel.
Secretary of the National Alcohol Ether Fuel and Alcohol Ether Clean Automobile Professional Committee Secretary-General Chen Weiguo said that the comparison of the properties of dimethyl ether and liquefied petroleum gas found that the premixed gas calorific value of liquefied petroleum gas is 3,909 kJ/m3, and dimethyl ether The premixed gas calorific value is 4219 kJ/m3, and the dimethyl ether has a high heating value; the pressure of the LPG stored in the cylinder is 1.92 MPa, and the dimethyl ether is 1.35 MPa. The lower explosion limit is 1.7% and dimethyl ether is 3.5%. Dimethyl ether is higher than the lower explosion limit of liquefied petroleum gas, low in vapor pressure, and safe for storage and transportation. In addition, the dimethyl ether stove fuel test results show that the dimethyl ether fire rate is 100%, pass fire time is 1 second, the flame state is uniform.
According to Chen Weiguo, at present, due to high oil prices, the price of liquefied petroleum gas has exceeded 5,000 yuan/ton, and the highest price has even reached 7,000 yuan/ton. The price of dimethyl ether is around 3300 yuan/ton. Therefore, dimethyl ether is very economical as an alternative fuel for liquefied petroleum gas.
Huang Zhen, dean of the Energy Research Institute of Shanghai Jiaotong University, believes that if DME production is adopted in the future, the production cost and process energy consumption will be further reduced. Huang Zhen told reporters that the current international natural gas prices and oil prices linkage, and domestic oil prices and international standards are sooner or later, the introduction of fuel tax is also a general trend. By then, the economic competitiveness of dimethyl ether will be stronger.
According to reports, at present, every ton of dimethyl ether can be used as a cooking fuel for five years for five families of four, and it also applies to townships and villages where natural gas facilities are not yet installed. The 400,000 tons/year production scale can be used by 8 million people for one year. By 2010, if 20% of the liquefied petroleum gas is replaced by dimethyl ether, the consumption of dimethyl ether will reach 6 million tons, and the market is very large.
At the 2007 China DME Production Application and Technology Exchange Conference held in Zhangjiagang City, Jiangsu Province on December 13-14, the participating experts agreed that dimethyl ether is used for urban gas, both from the perspective of performance and economy. Look, all have strong competitiveness.