The National Development and Reform Commission announced today the operation of the coal economy in April. The data shows that since April, the growth rate of coal demand has continued to drop, the production and sales have grown steadily, imports have increased substantially, the nation's major ports and key power plants have sufficient deposits, the market coal price has been on a downward trend, and the overall supply and demand are loose, and the economy has generally remained stable. According to relevant department express data, in April, the national coal production and sales volume increased steadily, and the growth rate decreased year-on-year. Railway coal traffic volume was 187 million tons, an increase of 6.1%; the growth rate was down 4.3% year-on-year. The main port coal shipped 54.13 million tons, down 1.1%, an increase of 17.2%. Coal imports 25.05 million tons, an increase of 90.1%; exports 830,000 tons, a decrease of 39.9%. The growth rate of coal consumption fell, among which coal consumption in the power industry increased by 0.5% year-on-year. At present, national key power plants have stored more than 88 million tons of coal, a record high. The thermal coal price of Qinhuangdao Port's 5500 kcal market was 775-785 yuan per ton, which was a decrease of approximately 40 yuan from the same period of the previous year and a decrease of 10 yuan per ton from the beginning of the year. The coal prices in the main coal producing areas and consumption areas have also declined in different degrees. The main business income and profit growth of the coal industry declined, and accounts receivable and costs rose.
U-tube refers to a heat exchange tube shaped like a U, which is an important part of a U Type heat exchanger. Advantages of U-shaped tube: The U-shaped tube heat exchanger has only one tube plate, both ends of the tube are fixed on the same tube plate, the tube can be stretched freely, no thermal stress, and the thermal compensation performance is good; the tube side adopts double tube side, The process is longer, the flow rate is higher, the heat transfer performance is better, and the pressure bearing capacity is strong. The tube bundle can be drawn out from the shell, which is convenient for maintenance and cleaning, and the structure is simple and the cost is cheap. The disadvantage of the U-shaped tube is that due to the limitation of the radius of curvature of the bend tube, the arrangement of the heat exchange tubes is less, the innermost tube spacing of the tube bundle is relatively large, the utilization rate of the Tube Sheet is low, and the shell-side fluid is easy to form a short circuit, which is harmful to the transmission. When the tubes are leaked and damaged, only the U-shaped tubes at the periphery of the tube bundle are easy to replace. If the inner heat exchange tube is damaged, it cannot be replaced, but can only be blocked. Moreover, one damaged U-shaped tube is equivalent to two damaged tubes, and the scrap rate is relatively high.
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