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.
Polyacrylamide (PAM) is a water-soluble polymer, which is insoluble in most organic solvents, has good flocculating properties, can reduce frictional resistance between liquids, Can be divided into non-ionic, anionic, cationic and amphoteric four types.
When PAM is used for flocculation, it is related to the surface properties of the species being flocculated, especially the potential, viscosity, turbidity, and pH of the suspension. The kinetic potential of the particle surface is the reason for particle inhibition. Can reduce the potential and condense.
Granular polyacrylamide flocculant cannot be directly added to sewage. It must be dissolved in water before use, and its aqueous solution are used to treat sewage.The water in which the particulate polymer is dissolved should be clean. Generally tap water is suitable for formulating polymer solutions. Strong ACID, strong alkali, high salt water is not suitable for preparation. Water at room temperature is ok, no necessary to heat. Dissolution is slow when the water temperature is below 5 ° C. Increasing the water temperature will accelerate the dissolution rate, but above 40 ° C will accelerate the degradation of the polymer and affect the use effect. The solution concentration is recommended to be 0.1% -0.3%.
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