回流

If the boiler check valve hasn't be shut, then must prevent steam and water back to the boiler . With the effect of tgravity, check valve and damper piston can immediately get airproof and the steam and water won't back to the boiler even in an atomosphere of low pressure.

如果锅炉没有关闭截止止回阀，则必须防止回流到锅炉上，阀瓣压铁和缓冲活塞，在重力的作用下，能够迅速实现密封，使得蒸汽和冷凝水即使在低压下也不会回流到锅炉里。

When left when the test-drive after repair in shop main engine is adding this ship to 540r/min, supercharger occurrence asthma brace up phenomenon, rotate speed lifts slightly again, noise shakes very big, smoke evacuation temperature is normal, hair of on the high side of temperature of air inlet duct is very hot, as good as of smoke evacuation smoke constant, supercharger rotor rotate speed and the rotate speed of right leader supercharger that work normally comparative. 2 breakdown analyse this model diesel engine supercharger breathes heavily brace up the reason has the following sides. Bearing of 1 supercharger rotor damages, bring about on the low side of supercharger rotor rotate speed or wave motion, make inadequacy of compressor part air feed and diesel engine and its demand do not match, bring about air current not to stabilize generation to breathe heavily brace up. 2 diesel engine offers oil, match gas to time forbid, match gas, draw well time and disorder, bring about supercharger to breathe heavily brace up. 3 supercharger nozzle jams, cause smoke evacuation not free, circumfluence of exhaust stroke waste gas, enter jackknife of new energy of life with the below one stroke that take energy of life, produce air current to hit generation to breathe heavily brace up. Canal of 4 smoke evacuation jams, smoke evacuation not free, bring about waste gas circumfluence, hit generation of new energy of life to breathe heavily brace up. 5 jams into gas mouth, enter gas inadequacy, generation breathes heavily brace up. 3 trouble removal are based on above analysis, adopt the following measure to remove trouble.

该舰在厂修后试车时左主机在加至540r/min时，增压器出现喘振现象，转速再略升高，声响震动很大，排烟温度正常，进气管温度偏高发烫，排烟烟色无异常，增压器转子转速和正常工作的右主机增压器转速相当。2故障分析该型柴油机增压器喘振的原因有以下几个方面。1增压器转子轴承损坏，导致增压器转子转速偏低或波动，使得压气机部分供气不足和柴油机及其需求不匹配，导致气流不稳定产生喘振。2柴油机供油、配气定时不准，配气、发火定时紊乱，导致增压器喘振。3增压器喷嘴堵塞，导致排烟不畅，排气冲程废气回流，和下一进气冲程进新气重叠，发生气流冲撞产生喘振。4排烟管堵塞，排烟不畅，导致废气回流，冲撞新气产生喘振。5进气口堵塞，进气不足，产生喘振。3故障排除基于以上分析，采取以下办法排除故障。

This paper aimed at the Daqing region based sauce, sweet paraffin base crude oil, the main tasks and objectives will be: 4 million tons / year, 330 days a year, total starts, top of the tower to take heat, the first mid-back to take heat, second heat to take the middle back the distribution of 5:2:3, based on the given crude true boiling point distillation data and products Engler distillation data to calculate the product of various complex decision to cut the program data to calculate the product yield, full-tower heat balance calculation, rendering the whole tower of steam , liquid load distribution.

本文设汁主要针对大庆地区低硫石蜡基原油，主要任务及目标为：400万吨/年，按每年开工330天计，塔顶取热、第一中段回流取热、第二中段回流取热分配为 5：2：3，依据所给的原油实沸点蒸馏数据及产品的恩氏蒸馏数据，计算产品的各物性数据决定切割方案，计算产品收率，进行全塔热平衡计算，绘制全塔汽、液相负荷分布图。

Results According to morphology, there were 3 types of superficial venous trunks in the flaps:"I" type,"Y" type and branch type. All types of the superfical venous trunks were the major passages in the venous drainage of the flaps. If the superficial venous trunks were occluded in pedicles, the venous drainage of the flaps almost stoped.

结果：根据形态可将逆行皮瓣中的浅静脉千分为3种类型：&I&形，&Y&形和树枝形，各种类型的浅静脉干都是皮瓣静脉逆向回流的主要通道，如果在蒂部将浅静脉干闭塞，皮瓣的静脉回流基本停滞。

If the capacitor has to be reflowed twice, 30 minutes must be layout between each time.

推荐回流焊只进行一次，回流焊次数如果需要二次，必须相隔30分钟以上

For protection against backpressure backflow, install Watts Series 909 or Series 009 reduced pressure principle backflow preventers.

对于反压力回流保护，需要安装美国瓦茨909系列或009系列减压原理防回流阀。

The discrete ordinates model was used for modeling the radiative heat transfer, and the effect of slag particles on radiative heat transfer was included.

结果表明：炉体入口存在张角约为10°的中心射流区，其流速和温度均较高，且周围存在明显回流区，回流区内部分颗粒富集；大部分颗粒直接落入渣池，且粒径越大落入渣池时温度越高；炉内温度分布除中心射流区，整体分布均匀，且随壁面灰渣厚度的增加而升高；计算结果与实验测量结果及文献值基本一致。

In this paper, the electrical control system for SMT solder-reflow machines is designed, based on the SMT solder temperature curve.

本文围绕SMT回流焊温度曲线的控制要求，对SMT回流焊电控制系统进行了设计和开发。

A dual check backflow preventer shall be installed at each wash sink hose unit or at referenced cross-connections to prevent the reverse flow of non-potable water into the potable domestic water system.

这种双止回防回流阀应该安装在每个冲刷洗涤盆软管装置处或参照交叉连接，以防止非饮用水回流到室内饮用水系统中。

Results The optimum extracting condition was as follows:50% ethanol,solidliquid ratio 1∶50 and refluxing and extracting for 3 h at 100℃.

结果乙醇回流提取法最好，且以50%乙醇按1∶50的料液比、在100℃回流提取3 h的方法提取，得到的打箭菊中的总黄酮含量最高。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。