薄板坯连铸连轧半无头轧制技术在线试验

介绍了本钢薄板坯连铸连轧生产线的主要设备和关键技术;分析了动态变规格、自动最小张力、活套控制和高速卷取设备;并在线试验了半无头轧制。采用该轧制技术,不但提高了带钢的厚度精度和平直度,且可生产极薄的带钢和高深冲性能的带钢产品。

Exploitation of Waste Heat from a Solid Oxide Fuel Cell via an Alkali Metal Thermoelectric Converter and Electrochemical Cycles

In order to employ the waste heat effectively,a novel three-stage integrated system based upon a solid oxide fuel cell(SOFC),an alkali metal thermoelectric converter(AMTEC)and thermally regenerative electrochemical cycles(TRECs)is put forward.Considering the main electrochemically and thermodynamically irreversible losses,the power output and the efficiency of the subsystems and the integrated system are compared,and optimally operating regions for the current density,the power output,and the efficiency of the integrated system are explored.Calculations demonstrate that the maximum power density of the considered system is up to 7466 W/m2,which allows 18%and 74%higher than that of the conventional SOFC-AMTEC device and the stand-alone fuel cell model,respectively.It is proved that the considered system is an efficient approach to boost energy efficiency.Moreover,the influence of several significant parameters on the comprehensive performance of the integrated system is expounded in detail,including the electrolyte thickness of the SOFC,the leakage resistance of the SOFC,and the area ratio between the SOFC electrode and the AMTEC subsystem.

新型聚羧酸复合材料的合成及其性能研究

采用自由基共聚的方法,以过硫酸铵为引发剂,自制的木糖醇丙烯酸酯(AMTC)与甲基丙烯酸羟乙酯(HEMA)、丙烯酸(AA)、甲基烯丙基聚氧乙烯醚(TPEG)共聚制得木糖醇改性聚羧酸减水剂。利用红外光谱(FTIR)表征减水剂的结构,并测试了水泥净浆流动度与混凝土应用性能。结果表明,选取水灰比为0.29,外加剂的固掺量为0.2%,当AMTC、HEMA、AA和TPEG的量比为7∶10∶10∶30,反应温度为70℃,反应时间为3h,引发剂用量为单体总质量的3.5%的条件下,净浆流动度达到296mm。应用性能表明,聚羧酸减水剂改性7d时,混凝土抗压强度提高了12%,28d抗压强度提高了7%。