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Project Briefs:

SAMCO Delivers Ultrapure Water Treatment System for Hydrogen-Fueled Power Plant

Project Overview

As developers planned a new 485 MW combined-cycle power plant located along the Ohio River, they sought a high-capacity water treatment solution that could operate in a compact space. Working closely with the EPC firm overseeing the project, SAMCO designed, engineered, fabricated, and delivered a turnkey raw water treatment system to meet the owner’s needs. The custom three-stage design allows the facility to efficiently produce ultrapure water for sensitive steam turbine and boiler applications.

Objective

Deliver a high-flow water treatment system to supply large power plant with ultrapure feedwater for high-pressure boilers and steam turbines. Project specifications included:

  • 320 GPM demineralization service flow rate
  • 18 megaohms per centimeter (MΩ-cm)

Scope of Service

The project’s EPC contractor selected SAMCO to provide design, bid and build services. The scope of services provided by SAMCO included system design, engineering, manufacturing, storage, delivery, and installation startup support.

Challenges

  • High flow rate needed
  • Limited space available
  • Low tolerance for contaminants in feedwater

Solution

As the first purpose-built power plant in the United States to use a mix of natural gas and hydrogen fuel, this project demanded an innovative design that would yield an efficient use of space and resources. To meet these challenges, SAMCO worked closely with the owner and EPC contractor to develop project deliver a turnkey raw water treatment system for the new 485 MW power plant.

 

The solution design featured a compact three-stage water treatment system consisting of a 4210 GPM raw water treatment subsystem, 690 GPM service water subsystem, and 320 GPM demineralization subsystem. This multi-stage treatment approach allowed the power plant to use streams from the first two stages for applications with less exacting quality standards, such as plant utility applications, cooling or cleaning, while conserving the ultrapure water produced during the final stage for use in sensitive equipment, like high-pressure boilers and steam turbines. The resulting system produces water with near-undetectable levels of metals and silica, and a resistivity of only 18 MΩ-cm, sufficient to ensure efficient heating and minimal maintenance for the plant’s boilers and steam turbines.

Technology

The solution design included the following equipment:

  • Raw Water Treatment System (4210 GPM) with chemical treatment, ballasted clarifier, gravity sand filter, air scour system, feed and recovery pumps.
  • Service Water Treatment System (690 GPM) with chemical treatment, high-flow multistage sand filter, feed and backwash pumps.
  • Demineralization Water Treatment System (320 GPM) with multi-pass reverse osmosis (RO) arrays, electrodeionization (EDI) arrays, clean-in-place (CIP) system, feed pumps, and storage tanks.
  • Piping skids
  • Control System with programmable logic controller (PLC) and Human Machine Interface (HMI)
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