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Dynamic Steady State - PowerPoint PPT Presentation

Continuous Discrete. Deterministic Stochastic. Dynamic Steady State. Needs. Synthesi s. Heat and Material Balances. Size and Costing. Economic Evaluation. Parameter Optimization. Structual Optimization. Final Flowsheet. Flowsheet. Analysis. Problem:.

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Presentation Transcript

Deterministic Stochastic

Synthesis

Heat and Material Balances

Size and Costing

Economic Evaluation

Parameter Optimization

Structual Optimization

Final Flowsheet

Flowsheet

Analysis

Compute Material Balance

Compute Energy Balance

How to compute?

Equation Solving Approach

Simultaneous Modular Approach

Specify flowsheet (topology) as series of process blocks connected by process streams

You specify inputs, process conditions and how to compute physical properties

System determines a computational sequence -- you can override

Simulator computes output flows from these data.

Simulator also computes energy usage, etc.

Flash a water stream

Flow: 1000 lb/hr

Pressure: 200 psia

Temperature: 300 F

Composition: 100% water

Given Inputs

Operating Conditions

Flash vessel is well insulated

Flashed to 20 psia

All flows

Temperature

Pressure

Desired

Temperature: ?

Pressure: 20 psia

Vapor

Q = 0

20 psia

Flow: 1000 lb/hr

Pressure: 200 psia

Temperature: 325 F

Flow: ?

Temperature ?

Pressure: 20 psia

Liquid

F = V + L

Mass Balance:

F*HF = V*HV + L*HL

Energy Balance:

Note: Since vapor and liquid, system is at saturation, so temperature is known (from steam tables)

1000 lb/hr = V + L

Energy Balance:

1000lb/hr*296 Btu/lb = V*1156.2 Btu/lb+ L* 196.25 Btu/lb

Note: Since vapor and liquid, system is at saturation, so temperature is known (from steam tables = 228 F and get enthalpy data from steam tables)

L = 896.1 lb/hr

V = 103.9 lb/hr

T = 228 F