制冷毕业设计(论文)

《制冷毕业设计(论文)》由会员分享，可在线阅读，更多相关《制冷毕业设计(论文)（81页珍藏版）》请在毕设资料网上搜索。

1、 装 订 线 I 摘 要 钢铁厂在生产出成品钢材后必须在短时间内将其卖出，使用钢材的单位在购 入钢材后需要及时的对钢材表面进行处理，达到防锈的目的。实践表明，钢材表 面不做任何防锈处理，7 到 10 天左右，表面就开始出现锈点，之后会以这些锈点 为核心，表面快速生锈，进而锈蚀到内部，影响钢材性能。 在现阶段，钢材市场比较萎靡，很多钢材厂家面临着困境：生产出钢材短期 内卖不掉，时间长了就会生锈，不生产钢材，就面临着倒闭。基于此种状况，一 种钢铁表面防锈剂被开发了出来，此种药剂可在钢材上冷床之前喷在其表面，达 到防锈目的，一般情况下，防锈时间可以达到未处理钢材的 8 倍左右，这样就能 为钢材厂家提

2、供足够的缓冲时间，同时，表面不生锈也能成为其一大卖点。 然而处理钢材表面是在进入冷床冷却之前，其表面温度达到 450左右，回 收的处理液温度也会很高，导致整个药箱内温度不断提升，最终会使防锈剂碳化 失效，因此，需要对药箱进行降温。 本课题的目的就在于设计出的制冷系统能使得要向内部温度恒定，制冷量必 须和余热量平衡，且随着钢材生产速度变化，制冷量也能够相应自动控制。 关键词关键词： 制冷系统 双温双控 自动控制系统 装 订 线 II ABSTRACT Steel plant must sell the finished steel products in a short period of ti

3、me, the units which use steel require timely processing of steel surface in the purchase of steel products, achieving the purpose of rust. Practice shows that the rust points on the steel surface with no rust treatment began to appear in 7 to 10 days. Then the steel surface rust rapidly taking the r

4、ust points as core, even corrode the internal steel, which impact properties of steel. At present, the steel market is sluggish. Many steel manufacturers are faced with a dilemma: if producing steel products can not sell out in the short term, it will rust after a long time, if not producing steel,

5、the Steel plant is faced with collapse. Based on this condition, a rust inhibitor for steel surfaces has been developed, this potion can spray on the surface before the steel cooling bed, so as to achieve anti-rust purposes, under normal circumstances, the anti-rust time can be achieved around eight

6、 times as long as untreated steel, so that it can offer enough buffer time for steel manufacturers, at the same time, the surface being not rust can become one big selling point. Steel surface is, however, before entering the cooling bed, the surface temperature reaches 450 or so, and the collection of fluid temperature will be also very high, which