Final KB Qs Module 2: Design Of Experiment Flashcards
What is Availability and Utilization?
The availability factor is the percentage of time which a process is operational (i.e. the process is ‘running’) while the utilization factor is the percentage of time that a process is being used for its intended duty while the process is operational.
Name the important roles of process design of a flowsheet
Test Work – They are used to design the test program
Project Costing – Project estimation is based on equipment costs … need to make sure you have included all equipment.
Building – You need to make sure you have every nut and bolt … flowsheets are at the center of this activity.
Process flowsheets show every equipment. Name the types (3). Give examples for each.
*Ancillary systems (e.g. Dust collection, overhead conveyors, ect…)
*Plant utility equipment (e.g. compressors, water systems, ect…)
*Equipment involved in the movement of the ore (chutes, pump boxes, ect…)
On what depends the number of flowsheet? (2)
- The level of accuracy of the project ( a conceptual study will need very few flowsheets compared to an EPCM).
- The complexity of the process not the tonnage (a hydrometallurgy plant can requires many more flowsheets than a mineral processing plant)
When drawing a flowsheet what should accompany every equipment?
*Equipment name
*Equipment number
*Process streams associated with the equipment (going in/out)
What is the Design of Experiments?
efficient procedure for planning and conducting scientific experiments investigate the relationship between input and output factors
Nuance correlation and causation.
“Correlation does not imply causation” means that a correlation between two variables does not imply that one causes the other
Name the 7 steps of DOE
- Consider all variables (factors) affecting the plant
- Establish the important measures of performance (responses)
- Choose a design based on how many factors affecting the system (design choosing)
- Determine which factors are most important (important factors) and continue next step (optimization)
- Develop a model (mathematical description – an equation) of how the key factors relate to the responses (i.e. y’s as a function of x’s)
- Use the model to find the optimum operating conditions for the process
- Validate the model
Name the steps of Response surface methodology (RSM) of DOE.(5)
(i) Perform a series of experiments.
(ii) Developing a mathematical model.
(iii) Determine a maximum or minimum value of response
and analyze the model.
(iv) Draw two and three-dimensional (3-D) plots.
(v) Optimization.
Give the 2d representation of Central composite designs
Give the number of experiments formulas
Give the α value formula
Give the code and actual values formula
