求翻译：　　　本文用图解法通过假设背压计算得出的循环水量找到单泵运行与泵并联运行的工作点，然后算出最低的水泵运行耗功量，并对热经济性进行修正，找出煤耗率最低的最佳真空和循环水泵运行方式。是什么意思？

This article the circulation water volume which obtains through the supposition back pressure computation found the single pump movement and the pump parallel operation operating point with the graphic method, then figures out the lowest water pump movement to consume the merit quantity, and carries

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