1. Wyoming Electric Coop owns a steam-turbine power-generating plant. Because Wyomingis rich in coal deposits, the plant generates its steam from coal. 111is, however, may result inemission that does not meet the Environmental Protection Agency standards. EPA regulationslimit sulfur dioxide discharge to 2000 parts per million per ton of coal burned and smokedischarge from the plant stacks to 20 lb per hour. The Coop receives two grades of pulverizedcoal, Cl and C2, for use in the steam plant. The two grades are usually mixed together beforeburning. For simplicity, it can be assumed that the amount of sulfur pollutant discharged (inparts per million) is a weighted average of the proportion of each grade used in the mixture.The following data are based on consumption of 1 ton per hour of each of the two coal grades.Coal gradeCLC2Sulfur dischargein parts per million18002100Smoke dischargein lb per hour2.1.9Steam generatedin lb per hour12,0009,000(a) Determine the optimal ratio for mixing the two coal grades.(b) Determine the effect of relaxing the smoke discharge limit by 1 lb on the amount ofgenerated steam per hour.

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Answered: (a) Determine the optimal ratio for…

(a) Determine the optimal ratio for mixing the two coal grades. (b) Determine the effect of relaxing the smoke discharge limit by 1 lb on the amount of generated steam per hour.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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