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CYCLEMAX系统是如何进行催化剂循环的?

答案

参考答案:

CYCLEMAX系统催化剂循环的工艺流程如图所示。催化剂循环包括:将催化剂从铂重整反应器输送到再生部分及返回。

(1)待生催化剂输送待生催化剂随重力从最后一个反应器流至催化剂收集器。催化剂向下流动,与向上流动的氮气逆流,进入待生催化剂L阀组件。来自提升风机的循环氮气与催化剂在L阀组件会合,并且通过待生催化剂提升管将催化剂提升到再生器之上的分离料斗。在分离料斗中,来自除尘风机的循环氮气,将催化剂碎片和细粒同整粒催化剂分开,并将它们随气体带出顶部。碎片和细粒在粉尘收集器中除去,氮气循环返回除尘风机和提升风机的入口。整粒的催化剂下降到分离料斗的底部,随重力流入再生器。该催化剂随重力流过并流出再生器。催化剂随重力流出再生器,与氮气对流,进入氮封罐。催化剂从氮封罐进入闭锁料斗。闭锁料斗输送上部容器小批量的催化剂,然后将催化剂连续地输送到再生催化剂L—阀组件。在L阀组件,来自铂重整装置的增压氢在提升管内同催化剂相混合,将催化剂通过再生催化剂提升管提升至第一个铂重整反应器顶上的还原区。催化剂随重力流过还原区至第一反应器顶部。催化剂随重力流过第一反应器,并且流至下一个反应器顶部,催化剂继续流过每个反应器,直到到达最后一个反应器底部为止,完成了输送线路。催化剂在两个反应器之间流动,其设计可确保等流量的催化剂流过催化剂床层。

阅读理解

A long time ago, in an Italian city, the people there built a tower which was admired by everyone passing through. A little further down the road, in a neighboring city, they had built a tower of similar beauty. The two towers were equally well known. The people of the second city, envious (妒忌的) and filled with pride, planned to destroy the neighboring tower so it wouldn’t take attention away from their own. One night, they came to the tower and began to quietly undermine its foundations(地基).

The next morning, the tower was leaning(倾斜) slightly ,but nobody noticed. The same happened for the following few days, until a little girl who was passing by pointed up at the tower and said: “ I think the tower is going to fall down.” And everyone around looked closely, and could see that she was right .Nervousness spread through the city. And they tried many methods to try to straighten the tower, but nothing seemed to work. That was, until one day when the same little girl was walking up again, and she put her arm on the side of the tower to rest. She felt the tower shaking slightly. When she took her hand off it, the movement stopped. And when she put it back on again, the same thing happened. The girl spent a while doing this, until she was completely certain of what she had discovered: “ The tower is ticklish ( 怕痒的) !” She ran to get some plants, and she planted them right next to the tower. Now if the tower leant over any further it would be tickled by the leaves of those plants. Being a ticklish tower, it would then return to where it had been. In this way, the girl managed to make sure that the tower didn’t fall down, but still kept it leaning a little.

The fact that it was leaning made it even more famous, and this taught a fine lesson to the envious people of the neighboring city.

小题1:Why did the people of the second city plan to destroy the neighboring tower?

A.Because the tower blocked the way of their tourists.

B.Because the tower had the same building style as theirs.

C.Because they hoped that the tower could lean slightly.

D.Because they hoped that visitors just liked their own tower.小题2:The underlined word“undermine”(in Paragraph1)probably mean “_________”.

A.test

B.raise

C.damage

D.strengthen小题3:When local people heard the news that their tower was going to fall down, they were _________.

A.very anxious

B.very happy

C.very ashamed of themselves

D.angry at the people in the neighboring city小题4:What lesson can we learn from the practice of the envious people in the neighboring city?

A.All that ends well is well.

B.Every dog has his day.

C.A bad beginning makes a bad ending.

D.A friend is never known till a man has need.

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