混流通风自润滑电机轴承结构的研究

混流通风系统提升了高压方箱电机的换热效果,同时令内风扇侧轴承温度升高。通过对混流通风自润滑电机不同轴承结构的设计、试验对比分析,确定了有效解决混流通风自润滑电机轴承温度高的轴承结构方案。

新型储粮四合一技术暨双向混流通风、环流控温、空调补冷、臭氧杀菌储粮系统介绍

在双向混流通风降温及环流控温过夏试验的基础上,针对全国性的生态储粮新要求,增加了粮仓专用空调和配套臭氧发生装置。该系统结构简单、集成化程度高,全部采用电器控制,非常适合全自动储粮科技发展方向,以低温控温储粮为主线,粮食储存品质最优,每一项技术都会充分利用而不会闲置。能适应各种不利的储存环境,粮温高、水分高、霉菌量高都能得到有效地化解及控制,是储粮科技手段的重大进步。

双向混流通风、环流控温、空调补冷、臭氧杀菌储粮系统介绍

在新型粮仓通风、环流一体化系统成功进行了双向混流通风降温及环流控温度夏试验的基础上,增加了粮仓专用空调和配套臭氧发生装置。该系统能适应不利的储存环境,且能有效控制粮温、水分、霉菌量。

天津地区冬季两种储粮通风方式应用效果分析

以楼房仓为供试仓房,以加拿大小麦为供试粮食,对比离心通风和混流通风对储粮通风前后温度、水分变化及通风时间和能耗的影响。结果表明,通风前,离心通风仓和混流通风仓粮食平均温度分别为12.1、12.0℃,平均水分分别为11.44%、11.45%;通风后,离心通风仓和混流通风仓粮食平均温度均为-0.5℃,平均水分分别为11.25%、11.41%。离心通风仓和混流通风仓通风时间分别为48、173 h,总耗电量分别为1056、1038 kW·h。与离心风机相比,混流风机通风虽然所需时间长,但粮食水分损失小,所需能耗低,应成为天津地区乃至第四生态储粮区储粮机械通风的主要方式。

混流静态房式谷物干燥机试验验证

针对当前广泛应用的各类谷物干燥机普遍存在高温快速干燥爆腰率高、低温干燥脱水速率低、循环干燥破损率高、热能利用率低和烘干成本高等问题,介绍了一种混流静态房式谷物干燥机,其采用"保温控湿、热风循环利用、混流通风、薄层大风量静态持续干燥"的谷物机械干燥新方法,可解决谷物干燥爆腰率高、损伤率高和脱水效率低等系列问题,实现热风循环利用,提高烘干热效率。2017—2019年,在同等干燥条件下应用该机与其他类型烘干机、人工晾晒等谷物干燥方式开展了多批次干燥稻谷及杂交水稻种子的对比试验及性能验证工作。结果表明,该机在烘干效果、效率及烘干成本等各方面明显优于其他类型烘干机,在水稻种子干燥方面也有突出表现。经第三方检验检测机构检测,该型干燥机干燥谷物的籽粒脱水速率1.3%/h,爆腰率≤0.01%,籽粒破损率≤0.02%;干燥水稻种子的脱水速率0.9%/h,干燥种子的发芽率和破损率与自然晾晒级相当。

Currents and mixing in the northern South China Sea

We investigated the vertical distribution of current velocity data of the entire water column at a site on the continental shelf of the northern South China Sea(SCS) from August 4 to September 6,2007,and found that the characteristics of barotropic and baroclinic tides are mainly diurnal.During the observation period,we also estimated the mixing before and after the passage of Typhoon Pabuk.We found that the internal-wave-scale dissipation rate,the turbulent dissipation rate,and the mixing rate in every water layer increased by about an order of magnitude after the typhoon passage.We analyzed a case of abrupt strong current and calculated the mixing rate before,during,and after the typhoon event.The results show that the internal-wave-scale dissipation rate and the mixing rate in every water layer increased by about two orders of magnitude during the event,while the turbulent dissipation rate increased by about an order of magnitude.Passage of the abrupt strong current could also have increased the mixing rate of affected seawater by more than an order of magnitude.However,the passage of the typhoon differed in that there was an increase in mixing only in the lower layer where the abrupt strong current was particularly strong.The variation of the mixing rate may help us to understand the effects of typhoons and abrupt strong currents on the mixing of seawater.