预热

At present, hot-blast stove designers have been used to refer to remaining heat exchanger when they designed heat exchanger of hot-blast stove, and have taken examples in accordance with experience of remaining heat exchanger.

目前热风炉换热器的设计多借鉴工业炉用预热助燃空气的高温换热器，选型多按余热利用换热装置在设计及应用中形成的经验选型。

The author emphatically describes Quantum PLC based process control systems of the hot-blast stove body, Siemens S7-400 PLC (software configuring in PCS7 pattern) based hot-oil preheating control system of the hot-blast stove and the heat-exchanging electric control system of the hot-blast stove based on the mix- configured system of Siemens S7 and Siemens S5 series PLC, elaborates their system constitutions, software and hardware configurations, operational principles, main control functions and applicative effects.

摘 要：本文简介了邯钢7#高炉热风炉的工艺状况，重点描述了基于Quantum PLC的热风炉本体仪控系统、基于西门子S7-400PLC (PCS7)的热风炉热油预热控制系统和基于西门子S7与 S5系列PLC混合配置的热风炉换炉电控系统的构成、软硬件配置、工作原理、主要控制功能和应用效果。

After diagnosing the energy-used of the heat exchanger networks of optimization, hot-cold curves and grand curves were obtained. The results indicates that pinch temperature is improved, utility quantity is much reduced, and final temperature of the preheated crude oil is increased, which proves the optimal heat exchanger networks are the most optimal ones tosome extent.

对优化后的换热网络进行用能分析，做出了过程的组合曲线和总组合曲线，结果发现夹点温度有所提高，冷热公用工程用量降低了很多，原油预热终温提高了，证明优化后的换热网络在一定程度上达到了最优。

Tempilstick should be used at distance above 75mm from a welding seam to check the temperature about preheating and interlays.

预热和层间温度都应用测温笔在离开焊缝不小于75mm 的地方进行检查。

Spot checks contractor piping isometrics or fabrication drawings showing weld procedures, filler metal, pre-heat and post-weld heat requirements and monitors their use.

抽检承包商的管道轴侧图和预制图中关于焊接程序、填料、预热和焊后热处理的要求并监督其实施情况

The research results indicate that the interface between weld and l2Crl MoV steel is the weakest part of welded joint. However ,the interfacial failure tendency of low match welded joint is less than those of medium and high match welded joint.

试验结果表明，焊前预热250℃，焊后回火750℃×1h，加速模拟运行500h后，高匹配和中匹配接头的力学性能劣化明显，界面蠕变损伤及失效倾向较大；而低匹配接头的力学性能优于高匹配和中匹配接头，界面蠕变损伤较轻，失效倾向较小。

This topic research initially summarized set of weldings crafts, including the preheating temperature determination, the low intensity match feasibility, the welding speed selection as well as the line energy indeed grades, these research techniques and the method may directly use in the production practice.

初步总结了一套焊接工艺，包括预热温度的确定、低强度匹配的可行性、焊接速度的选取以及线能量的确定等，这些研究方法与手段可以直接用于生产实践。

Pieces of welders according to the different stiffness of materials and take the appropriate warm-up measures temperature and welding technology.

25根据被焊工件材质与刚度的不同，采取相应的预热温度及焊接工艺措施。

The combustor is of the vaporiser type, and hence is equipped with three preheat burners.

燃烧室是汽化器的类型，因此是有三个预热刻录机。

Meanwhile, cook the tortellini in a large saucepanof boiling water following packet directions or until al dente.

将烤箱预热到200°C。将意大利熏火腿单层的展在烤盘上，烘烤8分钟或者直到卷曲，起皱。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。