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Dry FGD technologies compared by Kiewit at March 27 webinar
Mitch Krasnopoler of Kiewit provided a detailed analysis of circulating dry scrubber installations in the U.s. Features of the designs offered by a number of suppliers were compared. This presentation was updated on April 9th to include the Clyde Bergemann dry scrubber.
Revision Date: 4/8/2014
Tags: Kiewit, Clyde Bergemann, Kansas City Equipment Company, Circulating Dry Scrubber
The reducing environment produced by oxygen scavengers initiates and propagates flow-accelerated corrosion (FAC) in the feedwater system and other components of high-pressure steam generators, including heat recovery steam generators (HRSGs). Since 1986, FAC-induced attack has caused numerous failures, some with fatalities, at a number of power plants in the U.S. Yet, specifications for many new power plants both domestically and globally, and in which the condensate/feedwater system contains no copper alloys, continue to call for oxygen scavenger feed to the condensate. This document is a response to this misguided trend.
Revision Date: 8/25/2014
Tags: 221112 - Fossil Fuel 化石燃料, Kiewit, Boiler Feedwater System, Heat Recovery Steam Generator, Ultrapure Water, Corrosion, Demineralization, Boiler Feedwater Treatment, Degasification
Flow accelerated corrosion is an important issue causing problems in turbulent areas such as elbows.
Revision Date: 8/28/2014
Tags: 221112 - Fossil Fuel 化石燃料, Kiewit, Oxygen, Demineralization, Corrosion
Demineralization and Degasification Webinar - Hot Topic Hour August 28, 2014
Advantages of combining membrane contactors and EDI. Focus on the choices that need to be made by purchasers and operators of ultrapure water systems for gas turbine combined cycle power.
Revision Date: 8/28/2014
Tags: 221112 - Fossil Fuel 化石燃料, SnowPure, Ultrapure Water, Kiewit, EDI, Membrane, Ultrapure Water, Corrosion
Questions answered regarding HRSG water/steam chemistry and prevention of corrosion and fouling in steam generators. Even seemingly minor issues have been known to cause failures that cost power producers millions of dollars and in some cases even claimed lives. This is the ultimate cost.
Revision Date: 9/25/2014
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Kiewit, Air Cooled Condenser, Heat Recovery Steam Generator, Fogging System, Treatment Chemicals, Cycle Chemistry, Corrosion, Ultrapure Water, Water Treatment, Zero Liquid Discharge
Power Plant Chemicals Webinar - Hot Topic Hour September 25, 2014
The level of knowledge demonstrated by the speakers relative to the challenges of preventing corrosion and malfunction of gas turbine combined cycle plants which are cycling hundreds of times per year and may be using poor quality source water makes a persuasive case for continuing expert advice.
Revision Date: 9/25/2014
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, McIlvaine, Kiewit, Miox, HDR Engineering, Heat Recovery Steam Generator, Air Cooled Condenser, Fogging System, Cooling Tower, Treatment Chemicals, Ultrapure Water, Cycle Chemistry, Corrosion, Water Treatment, Zero Liquid Discharge
Cooling Tower Calculations by Nick Schroeder - Kiewit - Hot Topic Hour November 13, 2014
Nick provided an interesting perspective on the science of cooling.
Revision Date: 11/13/2014
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Kiewit, Cooling Tower, Efficiency
Power Plant Cooling Webinar - Hot Topic Hour November 13, 2014
The webinar focused on the decisions power plants will make relative to steam cooling at both new and existing facilities.
Revision Date: 11/13/2014
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Nalco, Ovivo USA, National Energy Technology Laboratory, Research Cottrell Cooling, Kiewit, Clarifier, Water Intakes, Water Quality Modeling System, Boiler Feedwater System, 316(b), Regulation, Efficiency, Water Reuse, Wastewater Reuse, Heat Recovery, Water Treatment, Water Conservation
Brian presented an analysis of wastewater treatment options.
Revision Date: 3/12/2015
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Kiewit, Zero Liquid Discharge System, Zero Liquid Discharge, Wastewater Treatment
Mitch compared the features of various dry scrubbing systems.
Revision Date: 3/20/2015
Tags: 221112 - Fossil Fuel 化石燃料, Kiewit, SDA, DSI
Maintaining High Combined Cycle HRSG Efficiency and Reliability
This article in Power Engineering by Brad Buecker of Kiewit addresses chemical treatment of HRSG feedwater. During the heyday of coal-fired power plant construction and operation in the last century, many lessons were learned regarding correct water/steam chemistry control in high-pressure, fossil-fuel steam generators. Even seemingly minor issues had the potential to cause serious problems, and some corrosion-induced failures led to injuries and death of plant personnel. Progress in transferring these lessons to the combined cycle power industry has often been slow, and a number of outdated chemistry concepts continue to appear in the specifications for new combined cycle plants. Some problems are magnified by the unique geometrical features of heat recovery steam generators (HRSGs) as compared to their coal unit counterparts. This article will examine three of the most important issues in this regard, as outlined below: • Unless the condensate/feedwater system of the HRSG contains copper alloys (very rare), an oxygen scavenger should not be part of the chemical treatment program. Use of oxygen scavengers, a more accurate term is reducing agent, induces flow-accelerated corrosion (FAC) of plain carbon steel. FAC has caused catastrophic piping and tube failures at a number of facilities over the last three decades, and it continues to occur at many plants. • Tri-sodium phosphate has served as the primary chemical for boiler water treatment in many base-loaded coal units, and the chemistry is often employed in HRSGs. Even at steady load, phosphate treatment is problematic due to the phenomenon known as phosphate hideout. In cycling units, hideout may make phosphate chemistry extremely difficult to control. • While a strong focus should always be placed on operating chemistry, off-line chemistry control is frequently neglected. Air in-leakage into water-filled steam generator networks during down times can significantly damage tubes, piping, turbine blades and rotors, and other equipment. Given the regular cycling nature of most power plants in today's environment, the potential for air ingress and subsequent corrosion may be extensive.
Revision Date: 3/5/2018
Tags: Kiewit, Feedwater, Chemical, Heat Recovery Steam Generator, Power Engineering