《化学工程与工艺专业英语》课文翻译(16)

Once the pilot plant is operational, performance and optimization data can be obtained in order to evaluate the process from an economic point of view. The profitability is assessed at each stage of the development of the process. If it appears that not enough money will be made to justify the capital investment, the project will be stopped.

中试车间一旦开始运转，就能获得性能数据和选定最佳数值以便从经济学角度对流程进行评价。对生产过程的每一个阶段可能获得的利润进行评定。如果结果显示投入的资金不能有足够的回报，这项计划将被停止。

The pilot plant offers the opportunity to evaluate materials of construction, measurement techniques, and process control strategies. The experimental findings in the pilot plant can be used to improve the design of the full-scale plant.

中师车间还提供了评价设备制造材料、测量方法、流程控制技术的机会。中试车间的这些实验数据对于工业装置设计的改善能提供有用的帮助。

2. Design

Based on the experience and data obtained in the laboratory and the pilot plant, a team of engineers is assembled to design the commercial plant. The chemical engineer‘s job is to specify all process flow rates and conditions, equipment types and sizes, materials of construction, process configurations, control systems, safety systems, environmental protection systems, and other relevant specifications. It is an enormous responsibility.

2．设计

根据在实验室和中试车间获得的经验和数据，一组工程师集中起来设计工业化的车间。化学工程师的职责就是详细说明所有过程中的流速和条件，设备类型和尺寸，制造材料，流程构造，控制系统，环境保护系统以及其它相关技术参数。这是一个责任重大的工作。

The design stage is really where the big bucks are spent. One typical chemical process might require a capital investment of $50 to $100 million. That‘s a lot of bread! And the chemical engineer is the one who has to make many of the decisions. When you find yourself in that position, you will be glad that you studied as hard as you did (we hope) so that you can bring the best possible tools and minds to bear on the problems.

设计阶段是大把金钱花进去的时候。一个常规的化工流程可能需要五千万到一亿美元的资金投入，有许多的事情要做。化学工程师是做出很多决定的人之一。当你身处其位时，你会对自己曾经努力学习而能运用自己的方法和智慧处理这些问题感到欣慰。

The product of the design stage is a lot of paper:

(1) Flow sheets are diagrams showing all the equipment schematically, with all streams labeled and their conditions specified (flow rate, temperature, pressure, composition, viscosity, density, etc.)

设计阶段的产物是很多图纸：

（1）工艺流程图。是显示所有设备的图纸。要标出所有的流线和规定的条件（流速、温度、压力、构造、粘度、密度等）。