Energy Conservative Assessment Methodology


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Document Category Engineering
Document Target Users Welding Technician and Supervisors, Engineers and Consultants

There are four essential tasks in any energy assessment study of an existing plant:

Energy Conservative Assessment Methodology

– Data gathering, Models and Targets
– Insights, Opportunities and Estimated Savings Potential
– Screen and Formulate Strategy
– Document, Report and Present

These tasks are normally exhibited in the 10-Steps procedures below:
1. Site survey through templates, checklists and interviewing of process owners/proponents to gather the right amount of data that enable the energy team build the plant’s “big picture” and understand the goals and the constraints of the facility(What to look for and what to ask)
2. Define the criteria for focusing on potential areas of interest (when to be rigorous and get to the second level of details)
3. Develop site energy/utility nominal design/normal operation models with the appropriate levels of details in high level generic “path” diagrams for, power, fuel, H2, steam, water, nitrogen and air. The preliminary purpose of these models will be to understand what is going on in the energy utility system, locate the “energy consumption elephants” in both process and utility plants and generate insights for energy saving opportunities

4. Add more depth in the level of details of the energy utility model for each energy consumption “elephant” and/or other criterion of focus

5. Define the effect of disturbances and uncertainty on the energy utility system models

Sources of disturbances
Site energy utility balance under disturbances
Nominal and dynamic targeting of energy utility systems
(Check that the “big picture” depicted for the process and the utility plants is correct with enough degree of confidence before you proceed)

6. Target (order of magnitude targeting)
Identify main processing issues that affect utility utilization
Link utility-utility interactions
Integrate and qualitatively optimize site utilities (If we do not coordinate between steam and fuel systems we may stop flaring steam but flaring fuel) for energy utility saving

7. Integrate core processes among themselves and with utilities
8. Develop a comprehensive initiatives list via identifying and estimating energy utility savings opportunities
Housekeeping list
Checklists (generic and process specific)
Waste energy recovery (pinch method and others)
In-process Modification (pinch method and others)

9. Champion a cross-fertilizing discussion among plant disciplines to prioritize, screen the initiatives and writing a project sheet, for each initiative, including a description of the opportunity and energy utility savings estimate

10. Develop “word” strategies for realizing savings from facility goals, analysis of the results and the mapping of the opportunities onto the facility strategy (remember, 50% of something is better than 100% of nothing) then report and present results

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