"Now it is a traditional off-season coal, but the domestic coal price has risen very sharply, and our customers have begun to import foreign coal replenishment demand." Liu Bo, trade manager of the coal import trader Century Phoenix International Trading Co., told the reporter. Recently, interviews with authoritative sources and a number of coal traders confirmed that in the context of the recent sharp increase in domestic coal prices and the occurrence of coal shortages in a large number of thermal power units, many power plants began to increase the amount of imported overseas coal. Experts in the industry pointed out that re-increase the overseas coal resources, which are not low in import prices, means that the interests of both coal and electricity intensified due to the power shortage have entered a stage of white-hot.
 Since China became the net importer of coal for the first time in 2009, many power plants have used imported coal as an important means of playing a game of coal prices that are gradually rising. However, at the end of 2010, the world's major coal-producing land, Queensland, Australia suffered from floods. Coal production and exports were severely hampered. Coal prices in the Asia-Pacific market rose rapidly, and some coal prices were higher than domestic prices. Wang Siqiang, deputy director of the Comprehensive Department of the National Energy Administration, also reminded at the press conference on energy and economic situation in the first quarter that “the current domestic and international coal price inversion has exceeded 100 yuan per ton, and China’s coal imports will be affected.†However, with Qinhuangdao coal price with the significance of national coal price wind vane has continuously increased, and the price difference between domestic and foreign coal prices has gradually narrowed. The reporter learned from Qinhuangdao Coal Network that the average price of thermal coal in the Bohai Sea has risen for eight consecutive weeks, rising to 820 yuan/ton. The increase reached 6.91%, which has set a record high since the establishment of the price system in September 2010. From the coal company, it seems that there is no sign of a decrease in coal prices in the short term. A deputy general manager of a large coal enterprise with an annual output of more than 50 million tons told the Economic Information Daily that the cost of coal production including steel, cement, and wages of workers has also risen, showing the power shortage. In terms of demand, it is unlikely that domestic coal prices will fall in the short term. The executive also said that the rise in coal prices has caused the current tight supply and demand of electricity is not objective. "Power plants are also playing games with coal companies through various means. For example, many electric companies have begun to restrict domestic coal purchases, such as importing overseas coal." It is said that even in the context of tight power supply, the five major power generation groups are still purchasing more than 200-300 yuan of contract coal for contracted coal to reduce costs. The reporter learned from the insiders of Qinhuangdao Port Co., Ltd. that the recent power plant accidents in the South Power Plant have occurred, and many coal-fired days have fallen within 10 days. During the power shortage period, the international coal price showed a downward trend, and many power plants trapped in high domestic coal prices were found to be able to import coal overseas. Platts data shows that as of May 13, the FOB 6300 kcal/kg thermal coal in Newcastle, Australia has fallen from $133/ton in March to $117/ton. Xu Xu believes that China's coal import enthusiasm is not high in the first quarter of this year, but since the second quarter, the power supply in many regions of China has been tight, which may stimulate the recovery of China's coal imports in the later period. In addition, since late March, China's Bohai Sea thermal coal has risen for 8 consecutive weeks, and the domestic and international coal price gap is gradually narrowing, which also creates favorable conditions for the Chinese coal traders to import enthusiasm. Xu Xu judged that the international coal price may continue to fluctuate upwards throughout the year. However, as the domestic coal supply tension is more serious than last year, domestic coal prices are expected to continue to rise, the domestic and international coal price gap will gradually shrink, and even domestic prices may be high. At international prices. Xing Lei, a professor at the China Coal Economic Research Institute of the Central University of Finance and Economics, said in an interview with the Economic Information Daily that it is normal for power plants to look for cheaper coal overseas, but this time they import overseas coal during the power shortage. In terms of quantity and price, it more reflects the game between power plants and coal enterprises. "Because the current international coal price is still higher than the domestic coal price, plus Shanghai freight, it is not much cheaper than overseas coal; not to mention the import volume of China's power plants, the short-term solution to the immediate needs of power plants, can not be effective Supplementary power plant inventory. It can only be said that the interest game between coal and electricity has entered a stage of white-hot." Xing Lei said.
 Overshot Assembly
Overshot go into the heart of the drill pipe, the slider move up, make the tube socket head can be inserted into the center, when on the slider move up tight, using friction lift drill, remove loose again after the slider, by means of the connection string to slide along the block should tighten, set aside the center pipe, but in front of the salvage must first determine the bit in the bottom of the hole position, can be in a thin plate with bolts tight end of drill pipe, Drop the drill pipe to the bottom of the hole and press it on the drill bit. After waiting for a moment, it is proposed that the relative position of the drill bit at the bottom of the hole and the center of the rotary plate of the drill can be determined by observing the indentation left by the center pipe of the drill bit on the board, and then move the drill or rotary plate so that the center of the rotary plate is directly in front of the center pipe of the injured head, so as to ensure that the fishing device can be inserted into the center pipe accurately.
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