?? Shandong shunxinda Machinery Co., Ltd. (13969559358) is located in Liaocheng Economic Development Zone, Jiangbei water city with beautiful scenery. It is a company specializing in the production, processing and sales of precision seamless pipe, cold drawn precision seamless pipe and cold-rolled precision seamless pipe
Mass flow rate 4502000 KGM? 2s? 1. Vertical rising internal thread precision Q345B precision bright tube spot flow boiling heat transfer characteristic pressure 922mpa. Inner wall heat load 200700kwm? In the range of 2 parameters, the experimental study has been carried out for 1000MW ultra supercritical boiler?? The flow boiling heat transfer of steam water in 28.6 mm5.8 mm vertical upward internally ribbed water wall tubes was carried out. The results show that the swirling flow on the inner wall of the rifled tube can inhibit the off nucleate boiling (DNB heat transfer deterioration, and the steam dry type (do heat transfer deterioration) occurs in the high dryness region. The increase of mass velocity can delay the rise of wall temperature, which decreases with the increase of mass velocity. The higher the heat load is, the higher the wall temperature is. With the increase of heat load, the rise of wall temperature is advanced, and the rise of wall temperature increases after heat transfer deterioration.
? With the increase of pressure, the wall temperature rises and the dryness decreases. The flow boiling heat transfer coefficient of the spot steam water in the internal thread precision Q345B precision bright tube is? The peak value of heat transfer coefficient appears in the boiling zone. The experimental correlations of the heat transfer coefficients in the single-phase region and the steam water boiling region in the subcritical pressure region are also given. Causes and control strategies of water wall overheating of 1000MW Ultra Supercritical Pressure Boiler in Chaozhou power plant. By analyzing the heat load distribution of water wall and the principle of burner operation, it is considered that the main reasons for the over temperature of water wall are that the small diameter of orifice ring of water wall tube leads to the decrease of flow rate, and the unreasonable order of burner input causes the increase of heat absorption of water wall in the lower part of boiler. In order to prevent the water wall from overheating, the measures such as optimizing the operation mode of the pulverizing system, adjusting the combustion mode, reasonably controlling the coal water ratio, and strengthening the inspection of the throttle orifice are put forward. After taking temperature control measures in Chaozhou power plant, the number of Overtemperature of water-cooled wall is much less. Unit 34 of Chaozhou Power Plant Phase I expansion project is a 1000MW coal-fired steam turbine generator unit. The boiler is an ultra supercritical variable pressure once through boiler produced by Harbin Boiler Works Co., Ltd. It is a balanced ventilation, open-air layout, solid slag discharge, all steel frame and full suspension structure. use §± The energy conversion efficiency can be significantly improved by adopting three-dimensional layout, single furnace, improved PM type low NOx main burner, MACT type low NOx staged air supply combustion system, anti supercritical (ultra) thermal power technology and supercritical water-cooled reactor power generation technology, which can effectively inhibit heat transfer deterioration [3-4] and enhance heat transfer [5-6]. Therefore, internally ribbed tubes are widely used in two-phase heat transfer equipment, The inner thread water wall is used in the lower radiation zone of large capacity boiler. An extensive experimental study on the heat transfer and flow characteristics of smooth tubes [7-11], the heat transfer correlations obtained
Recommended websites: ? http://www.gb9948.cc/ Fertilizer tube
http://www.20g888.com/ ? Price of precision seamless tube
?? The company reserves a variety of specifications of precision seamless pipe, cold drawn precision seamless pipe, cold-rolled precision seamless pipe, perennial business in Tianjin, Baotou Steel, Baosteel, Hengyang, Angang, Chengdu, Yegang, Lubao, Anyang, Jiangyin, Hongdu and other high-quality seamless steel pipe, alloy steel pipe, high-pressure boiler pipe, alloy high-pressure seamless pipe, thick wall seamless pipe, fluid pipe, structural pipe, chemical fertilizer special pipe, Petroleum cracking pipe, low pressure boiler pipe, large diameter seamless pipe, large diameter welded pipe, precision steel pipe, etc. The materials of common resources are: 10 ¡Á 10, 20 ¡Á 10, 45 ¡Á 10, 16Mn, 27SiMn, 12Cr1MoV, 15CrMo, 12Cr1MoVG, 15CrMoG, 10CrMo910, 20Cr, 40Cr, 35CrMo, 304, 316, 316L, 310S, 309S, etc.