成功案例: 水处理

I. CUSTOMER ENVIRONMENT / PROJECT CONTEXT

Customer profile:

•  1.4 million people supplied
•  185 million m3 of drinking water supplied per year, 48 treatment plants
•  91 million m3 of wastewater treated per year, 70 treatment plants

Customer objective and constraints:

• Improve follow-up of optimum water flow profile in a pumping station at the output of a drinking water treatment plant (in Aubagne, near Marseille),
• Improve process efficiency by smoothing water flow,
• Energy savings,
• Find a compromise between service quality and energy savings and avoiding as much as possible jolts of pressure on water distribution.

II. SOLUTION IMPLEMENTATION

Implementation methodology (main phases):

• 1. analyse customer request in terms of process management, smoothness of operation and energy savings,
• 2. estimate possible energy savings with implementation of variable speed drives
• 3. commercial offer

Duration:

6 months

Solution overview (services, products, systems, architectures...) :

• 1. replacement of direct on-line starters by variable speed drives
• 2. two independent pumping systems, each one with 3 pumps in parallel (one pump in redundancy)

How did we estimate the energy savings (methodology, tools, ...)

•  Energy savings have been calculated by comparison of energy consumption before and after implementation of variable speed drives, during two comparable periods: July to November, 2007 and 2008,
• Significant variable: number of kWh per m3

III. RESULTS / ACHIEVEMENT

Customer benefits:

•   20% energy savings!
• Improved process efficiency and easier process management

Customer testimonies (Verbatim):

"The major benefit of variable speed drives is the better process control. Energy savings are the icing on the cake" 
Mr Emmanuel Guiol, responsible for Water production

Schneider Electric differentiating values VS competitors：

•  Long term partnership
•  Complete Power and Automation offer
•  Local service team
•  Strategic account approach