A three-dimensional finite-element model has been established to investigate the thermal behavior of the medium-thick slab copper casting mold with different cooling water slot designs. The mold wall temperatures meas...A three-dimensional finite-element model has been established to investigate the thermal behavior of the medium-thick slab copper casting mold with different cooling water slot designs. The mold wall temperatures measured using thermocouples buried in different positions of the mold with the original designed cooling system were analyzed to determine the corresponding heat flux profile. This profile was then used for simulation to predict the temperature distribution and the thermal stress distribution of the molds. The predicted temperatures during operation matched the plant measurements. The results showed that the maximum temperature, about 635 K in the wide hot surface, was found about 60 mm below the meniscus and 226 mm from the center of the mold. For the mold with the type I modified design, there was an insignificant decrease in temperature of about 5 K, and for the mold with the type II modified design, the maximum temperature was decreased by about 15 K and the temperature of the hot surface was distributed more uniformly along the length of the mold. The corresponding maximum thermal stress at the hot surface of the mold was reduced from 408 MPa to 386 MPa with the type II modified design. The results indicated that the modified design II is beneficial to the increase of mold life and the quality of casting slabs.展开更多
项目供热面积约1.14×10^(5)m^(2),总热负荷7000 k W,采用中深层地热供热,平均热负荷为4859.09 kW,项目年耗热量为62959.68 GJ。热源为1口水热型地热井,按照“一采一灌、同层回灌、取热不耗水”的模式进行建设,配套回灌井1口。利用...项目供热面积约1.14×10^(5)m^(2),总热负荷7000 k W,采用中深层地热供热,平均热负荷为4859.09 kW,项目年耗热量为62959.68 GJ。热源为1口水热型地热井,按照“一采一灌、同层回灌、取热不耗水”的模式进行建设,配套回灌井1口。利用中深层地热水作为供热热源,冬季提供45℃/40℃采暖循环水,采用“板换直供+热泵机组调峰”的方式为项目供热。按照30年运行期测算,中深层地热方案相比于天然气锅炉方案可节省费用1.127738×10^(8)元。展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.51525401,51274054,U1332115,51401044)the Science and Technology Planning Project of Dalian(No.2013A16GX110)+1 种基金the China Postdoctoral Science Foundation(2015M581331)the Fundamental Research Funds for the Central Universities
文摘A three-dimensional finite-element model has been established to investigate the thermal behavior of the medium-thick slab copper casting mold with different cooling water slot designs. The mold wall temperatures measured using thermocouples buried in different positions of the mold with the original designed cooling system were analyzed to determine the corresponding heat flux profile. This profile was then used for simulation to predict the temperature distribution and the thermal stress distribution of the molds. The predicted temperatures during operation matched the plant measurements. The results showed that the maximum temperature, about 635 K in the wide hot surface, was found about 60 mm below the meniscus and 226 mm from the center of the mold. For the mold with the type I modified design, there was an insignificant decrease in temperature of about 5 K, and for the mold with the type II modified design, the maximum temperature was decreased by about 15 K and the temperature of the hot surface was distributed more uniformly along the length of the mold. The corresponding maximum thermal stress at the hot surface of the mold was reduced from 408 MPa to 386 MPa with the type II modified design. The results indicated that the modified design II is beneficial to the increase of mold life and the quality of casting slabs.
文摘项目供热面积约1.14×10^(5)m^(2),总热负荷7000 k W,采用中深层地热供热,平均热负荷为4859.09 kW,项目年耗热量为62959.68 GJ。热源为1口水热型地热井,按照“一采一灌、同层回灌、取热不耗水”的模式进行建设,配套回灌井1口。利用中深层地热水作为供热热源,冬季提供45℃/40℃采暖循环水,采用“板换直供+热泵机组调峰”的方式为项目供热。按照30年运行期测算,中深层地热方案相比于天然气锅炉方案可节省费用1.127738×10^(8)元。
