Answered step by step
Verified Expert Solution
Link Copied!

Question

1 Approved Answer

When a chemical plant needs steam at multiple pressure levels, it is often economical to generate all the steam at a high pressure and then

When a chemical plant needs steam at multiple pressure levels, it is often economical to generate all the steam at a high pressure and then to let the steam down through pressure-reducing turbines to the desired pressure. This principle is illustrated in Figure 8.6. The downside of this approach is that as the exhaust pressure of the turbine increases, the theoretical (and actual)steam requirements increase, meaning that less energy is extracted. To illustrate this point, do the following

a. Estimate the amount of energy extracted from 10,000 kg/h of 58.6 barg steam superheated by 165°C when connected to the following turbines (each 80% efficient):

i. Exhaust pressure is 4″ Hg absolute.

ii. Exhaust pressure is 4.82 barg.

b. Estimate the amount of energy extracted from 10,000 kg/h of saturated, 10.0 barg steam when connected to a turbine (80% efficient) exhausting at 4.82 barg. c. Identify the locations of each of the three turbines described above on Figure 8.6

High Pressure (HP) Process Users of HP Steam Lost from Process Let-Down Stations Medium Pressure (MP) Process Users of MP Ste

High Pressure (HP) H Medium Pressure (MP) H Low Pressure (LP) H Makeup Water Fired Boiler Blowdown Condensate 2 Vent Deaerator Process Users of HP Steam Boiler Feed Water Pumps Lost from Process Process Users of MP Steam * Lost from Process Let-Down Stations Process Users of LP Steam Lost from Process Process Steam Generators of LP MP, and HP Steam Surface Condenser Figure 8.6. Typical Steam Producing System for a Large Chemical Facility

Step by Step Solution

3.50 Rating (160 Votes )

There are 3 Steps involved in it

Step: 1

blur-text-image

Get Instant Access to Expert-Tailored Solutions

See step-by-step solutions with expert insights and AI powered tools for academic success

Step: 2

blur-text-image

Step: 3

blur-text-image

Ace Your Homework with AI

Get the answers you need in no time with our AI-driven, step-by-step assistance

Get Started

Recommended Textbook for

Introduction to Chemical Engineering Thermodynamics

Authors: J. M. Smith, H. C. Van Ness, M. M. Abbott

7th edition

71247084, 978-0071247085

More Books

Students also viewed these Accounting questions