Project Owner:
Public Service Company of Colorado (an Xcel Energy Company)

Completion Date: Dec. 2002

Utility Engineering (UE) assisted Public Service Company of Colorado (PSCo) in a program to reduce SO2 emissions from PSCo’s coal-fired units located in the Denver metro area. UE provided comprehensive studies, which looked at the feasibility of several available SO2 removal technologies.

UE then prepared detailed cost estimates for both capital and operating costs for each removal technology. During detailed design and construction, UE provided project management, permitting support, conceptual and detailed design engineering, procurement services, construction management and contract administration, system start-up, testing and training.

The project involved the installation of lime spray dry scrubbers at three PSCo units and dry sodium injection systems at two PSCo units. Extensive duct and ash system modifications were designed and constructed in a manner that minimized unit outage time. The project was successfully completed on schedule and within budget. Each plant has experienced significant reduction in SO2 emissions, as shown below.

• Valmont Station Unit 5 - (190 MW – 80% SO2 removal using lime spray dry scrubbers)
• Cherokee Station Unit 3 - (160 MW – 80% SO2 removal using lime spray dry scrubbers)
• Cherokee Station Unit 4 - (360 MW – 80% SO2 removal using lime spray dry scrubbers)
• Cherokee Station Unit 2 - (106 MW – 50% SO2 removal using dry sodium injection)
• Arapahoe Station Unit 3 - (45 MW – 50% SO2 removal using dry sodium injection)

Project Features/Characteristics:

• Feasibility and Cost Studies
• Conceptual and Preliminary Engineering
• Permitting Support
• Project Management & Contract Administration
• Project Engineering
• Balance-of-Plant Design & Engineering
• Procurement
• Foundation Design
• Electrical Design
• Construction Management & Contract Administration
• Checkout
• Start-Up and Testing
• Training
  
  

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