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.
U-tube,U Shaped Tube,Bundle Tubes,U Tube Bundle Guangdong Jiema Energy Saving Technology Co.,Ltd , https://www.heatexchangerjiema.com
In addition, the company also issued an announcement saying that on April 9, 2010, the company signed an Investment Cooperation Agreement with the People's Government of Luntai County, Xinjiang Uygur Autonomous Region. The main terms are:
1. The company utilizes local resource advantages and plans to implement the development plan in two phases in Luntai. The first phase will invest 980 million yuan. Within 24 months, it will build an annual output of 300,000 tons of synthetic ammonia 480,000 tons of urea project; Within 5 to 10 years, 6 billion yuan will be invested in the construction of acetylene, caustic soda and PVC.
2. The People's Government of Luntai County promised to implement supporting resources such as 500 million cubic meters of natural gas and 500-600 million tons of coal mines in the local project; and provided a set of 300,000 tons of synthetic ammonia to the company at a preferential price of 119 million yuan. , 520,000 tons of urea plant; give preferential policies in hydropower, land, roads, etc., to provide support for the project The company enjoys relevant tax incentives in local projects.
According to the company’s announcement, compared with January 1, 2010 to March 31, 2009, compared with January 1, 2009 to March 31, the net profit increased by about 209%-228%, mainly due to the company’s leading product, urea, The sales price of diammonium phosphate was higher than that in the first quarter of 2009 and the increase in urea production after the company’s holding subsidiary, Ordos United Chemical Co., Ltd., produced an annual output of 1.04 million tons of urea.
According to today's announcement of Hubei Yihua Chemical Industry Co., Ltd., the company’s wholly-owned subsidiary, Inner Mongolia Yihua Chemical Co., Ltd., which was reviewed and passed by the company’s fourth and fifth extraordinary shareholders’ meeting in 2009, has an annual output of 300,000 tons of PVC. The 300,000-ton ion-exchange membrane caustic soda project was put into operation one day before the start of production to produce qualified products. The company's PVC production capacity reached 540,000 tons and the capacity of ion-exchange membrane caustic soda reached 470,000 tons.