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介绍国产首台HG2008t/h 锅炉运行和检修情况,对发现的问题和存在的隐患进行分析,提出下一步试验研究方向和解决问题的关键。图7 参2 相似文献
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为了进一步改进核桃破壳装备的设计与制造,利用万能材料试验机研究核桃压缩破裂的力学过程,分析含水率、加载速度对核桃壳破裂力学参数的影响。沿3个加载方向压缩核桃和空核桃壳,对比分析核桃壳体的破裂过程。在4种不同加载速度(100,200,300,400mm/min)下,对4种含水率(4%,6%,8%,10%)的空核桃壳进行压缩试验,测定核桃壳的破裂力、破裂功、破裂功率和理论弹性模量,并对各力学参数进行显著性分析。结果表明,核桃壳体破裂属韧脆性断裂,空壳核桃壳体在线性区间内的破裂力学参数能较好地反映核桃壳体的压缩力学特性。随含水率和加载速度的变化,核桃壳体的各力学参数呈一定规律变化,且含水率、加载速度对核桃壳线性区间的破裂力、破裂功、理论弹性模量的影响显著,对核桃壳线性区间的破裂功率的影响不显著。 相似文献
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自分级挤压式核桃破壳机的设计与试验 总被引:1,自引:0,他引:1
设计并制作了一种集分级、破壳于一体的自分级挤压式核桃破壳机,将核桃分级与破壳两工序进行了整合。该机主要由变频电机、机架、调量板、分级装置、破壳装置、间隙调节装置等部分组成,破壳间隙和电机转速均可调,具有结构紧凑、操作简便等特点。以温185核桃为试验对象,对样机进行破壳试验,结果表明:最佳破壳参数为调量口大小70 mm,电机转速150 r/min,破壳间隙10 mm。在该参数下,一次性破壳率平均为93.2%,高露仁率平均为89.8%。 相似文献
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以紫薯为试材研究微波渗糖过程中微波功率、微波处理时间、真空度、液料比和明胶添加量对低糖紫薯果脯渗糖效果的影响。以果脯中还原糖含量为指标,采用响应面法对微波真空渗糖工艺进行优化。结果表明:经冷冻预处理紫薯,以液料比71(g/g)在混合糖液(糖液组成为质量分数20%麦芽糖与20%蔗糖,以355的质量比混合,明胶质量分数1%)中进行微波渗糖,微波功率560 W、渗糖时间7 min和真空度0.05 MPa。在该条件下制得的紫薯果脯中还原糖含量达3.60 mg/g,花色苷保留率达93%,品质较好。 相似文献
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The mechanism of 2-cyanopyrazine prepared from 2-methylpyrazine (2-MP) by catalytic ammoxidation has been explained by the theory of appropriate structure of group. A new catalyst of MoVPO was developed. The effects of catalyst promoter phosphorus and supports were investigated. The catalyst containing P, V and Mo in molar ratio of 1.4 : 1 : 0.02 and supported on activated alumina and prepared by impregnation method exhibits good activity and selectivity. Reaction factors such as reaction temperature, space velocity, feed composition and service life of catalyst were investigated. Optimum reaction conditions (the volume space velocity of 0.2h-1, the reaction temperature of 380 ~C and molar ratio of 1 : 7.8 : 8 : 8 for 2-MP, water, oxygen and ammonia) were obtained. Selectivity of 93% and yield of 86% could be achieved under these conditions. 相似文献
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To decrease the cost of electricity generation of a residential molten carbonate fuel cell (MCFC) power system, multi-crossover genetic algorithm (MCGA), which is based on "multi-crossover" and "usefulness-based selection rule", is presented to minimize the daily fuel consumption of an experimental 10kW MCFC power system for residential application. Under the operating conditions obtained by MCGA, the operation constraints are satisfied and fuel consumption is minimized. Simulation and experimental results indicate that MCGA is efficient for the operation optimization of MCFC power systems. 相似文献
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东风汽车零部件的发展.是和东风汽车建厂同步进行的。当时东风汽车在十堰建厂时,实际上是整个卡车的总成工厂和各个专业的零部件厂是同步建设的,而且零部件体系系统是很全的.基本覆盖了所有的零部件。这就是说东风卡车的零部件我们都可以自己做。这是一个历史成因造成的。所以,在商用车零部件方面,应该说东风汽车具备了一定的竞争优势。与整车可以做到同步规划, 相似文献
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