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Tag: Chemistry

Good Water Treatment Systems Need Both Equipment and Chemistry [PODCAST]

December 26, 2019
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The post Good Water Treatment Systems Need Both Equipment and Chemistry [PODCAST] appeared first on POWER Magazine.

Proper water treatment is vital to successful power plant operation. The water treatment system must be designed appropriately, implementing a suitable water chemistry program, and operated and monitored correctly. Having adequate training and utilizing the services of a knowledgeable partner can be invaluable.

Three water industry experts from U.S. Water, a Kurita company, were recent guests on The POWER Podcast. Kevin Milici, vice president of Marketing and Technology; Nathan Bach, vice president of Engineering Services and Equipment, and Joe Tirreno, vice president of Strategic Corporate Accounts shared insight from their years of experience helping customers develop sound water treatment solutions.

Bach noted that many older power plants are shifting from primary ion exchange, that is, cation-anion mixed beds, to membrane treatment systems for their demineralized water needs. Meanwhile, some that may have had older-generation membrane treatment systems, such as reverse osmosis (RO) and electrodeionization (EDI) systems, have been upgrading to include ultrafilters ahead of the RO to reduce fouling and extend membrane life or utilizing two-pass RO units to reduce the loading on EDIs.…

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Select Boiler Chemistry in the Design Phase of Project Life

September 2, 2018
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On many combined cycle projects, the major decisions about boiler chemistry are left until after the plant has been designed, equipment is procured, and construction is well underway. However, the best time to make these chemistry decisions is in the design phase of the project. That enables the engineering, procurement, and construction (EPC) contractor to design the plant that best fits the selected chemistry program (Figure 1).




1. Water treatment decisions.
The EPC contractors should design the plant that best fits the users’ selected chemistry program. Courtesy: Colleen Scholl, HDR Inc.

Phosphate Versus Oxidizing, All-Volatile Treatment

For example, consider the selection of a phosphate program versus an oxidizing, all-volatile treatment (AVT-O) program. Of these two, the phosphate program requires more-responsive instrumentation and controls, because of the potential problems of phosphate carryover and hideout. If the EPC contractor has a priori knowledge that phosphates will be used, its engineers can specify highly responsive pH and phosphate instruments, and can ensure those instrument signals are transmitted to automated chemical-injection pumps that feed into multiple injection points (Figure 2).…

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