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Design options and combinations of fixed and mobile demineralization equipment give power plant operators the flexibility to continually optimize their water treatment system to meet rapidly changing needs.
Today’s power generation marketplace has become very competitive. Contract water treatment services are one tool power companies are using meet their water treatment needs and increase their competitive position in the marketplace. In this environment, the company that can produce the lowest cost power sells the most, makes the most profit and wins the game.
Robert Taylor. GE Infrastructure, Water Process Technologies. >
Water treatment service providers have evolved from emergency mobile demineralizer suppliers to solution providers that can offer a flexible platform to integrate mobile or fixed membrane and media technologies, optimized to meet sitespecific client needs. Service contracts also offer clients the flexibility to continually optimize their water treatment systems to adapt to changes in demand for treated water quality or quantity, incorporate future water treatment technologies as they evolve, and meet ‘sitespecific’ environmental requirements. Water treatment service contracts let the power industry eliminate upfront capital outlay for equipment, and transfer operational and performance risk to experts in the field.
This article classifies water treatment service contracts for demineralized water into four categories, and presents associated design, economic and operational privileges to power plant designers, constructors, owners and operators.
Service contracts for high purity water production can be structured for terms of 1 to 15 years for continuous, seasonal or emergency use. Notice that service contracts in the power industry typically range in flow capacity between 50 and 1000 gpm, and designs can employ all mobile equipment, building/container enclosed fixed equipment, or a combination of fixed and mobile equipment to meet client needs. Now regarding the aforementioned fact… Equipment designs used by leading global service providers to meet the variable needs of the power industry can be generically classified into four categories.
In any class, the assets used to produce the treated water are owned by the service provider. The most successful new plants designed for mobile demineralizer treatment involve consultation with the service supplier in the design stage to address required footprint and utilities, instrumentation for monitoring, plant operational responsibilities and, most importantly, to provide adequate demineralized water storage tank volume. Normally, designs using mobile demineralizers present privileges to CT power plant developers since a mobile demineralizer is a true zero discharge treatment system, and no industrial wastewater discharge permit is needed. Make sure you leave a comment about it. Eliminating industrial wastewater generation and discharge can Actually the service provider provides the skilled operational support needed for membrane treatment technologies, assumes operational risk and offers system performance guarantees, while client operation and monitoring of mobile demineralizer equipment is typical.
Mobile Primary Treatment and Mobile Demineralization RO technology, in combination with mobile demineralization, presents privileges to improve treatment economics on water sources with greater than 200 to 300 ppm total dissolved solids.
The mobile RODI design is favored over mobile DI for installations with one or more of the following characteristics.
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Actually an integrated mobile platform presents privileges to clients that need continuous DI water production for a defined period, typically for one peak season.
Integrated mobile services for peak power facilities or for seasonal supplemental support at coalfired stations typically include a minimum service period commitment. You see, integrated mobile services require longer advanced notice and prescheduled service since RO equipment is a limited rolling stock inventory item and requires more preparation time by the service provider. The service supplier must be able to predict and schedule tangible business to present the most favorable economics, manage equipment inventory, and commit to equipment availability.
For seasonal operations, the fixed primary treatment design provides the ability to rapidly produce demineralized water.
Contracts are set up with a fixed fee to cover equipment amortization, plus a variable charge for operations, process chemicals and mobile demineralizers.
This assetlight design for fixed equipment minimizes installed assets on the ground to produce demineralized water. Although, a single mobile component is the mobile demineralizer, that is simply delivered to the plant to produce demineralizer water on a ‘asneeded’ basis when the power plant is dispatched for generation. That’s since the fixed equipment is already onsite with utilities connected and as it eliminates mobile pretreatment equipment preparation, delivery, setup time and charges.
Contracts generally have a lower percentage of fixed costs, with a higher variable percentage compared to asset heavy systems with identical flow capacity, since the fixed assets are small. Economics for baseload service are influenced by cost centers just like water quality and proximity to the service provider’s regeneration facility. Whenever during offpeak or non operational seasons, use of mobile equipment allows removal and cost savings, The low fixed costs are attractive to CT plants that operate in both winter and summer peak as. This fixed primary treatment design with mobile trailer mounted demineralizer polishing is currently in service at numerous fossil and nuclear facilities throughout the world. The fixed primary treatment design with mobile DI polishing is also successfully used for plants in baseload operation and plants that require customized pretreatment designs to treat challenging water sources, like tertiary municipal wastewater.
Fixed primary treatment designs can also use offsite regenerated naked mixed bed polishers to polish RO permeate.
Trailer polishing designs offer performance benefits and reduced operational risk to industry over use of naked mixed bed polishers. As long as they do not have ample ion exchange capacity to provide this amount of redundancy, naked mixed bed polishers carry a higher operational risk. Just keep reading! The RO unit can be partially or completely bypassed with feed sent to the mobile demineralizer without any deterioration in effluent quantity, Therefore in case there is a significant poser or failure of the RO system.
The economics of this design can offer a lower evaluated cost per unit volume for facilities in baseload operation.
Typical contract terms for this ‘asset heavy’ design are 5 to 10 years, as with the fixed primary treatment designs in category three. In both categories, use of standardized equipment designs for the fixed equipment enables service providers to present favorable economics for contract terms as short as five years. With a smaller variable fee percentage charged during DI production, asset heavy designs have a high percentage of fixed costs for capital recovery, consumables and operations. Notice, this capability ain’t available with custom engineered equipment as these assets can not be readily redeployed, and all costs for this equipment are recovered over the contract term.
Discussion of system designs and the associated economic, operational and commercial privileges for this class of service was well documented in other work. Accordingly a piece of paper won’t So importance of mobile demineralizer and integrated mobile services capabilities shouldn’t be overlooked, even though mobile trailermounted equipment ain’t used in daily operation with this design. So an important question to ask is, How will that supplier ensure performance guarantees for water quantity and quality when problems occur, when considering a service supplier. True service companies have a global backup fleet of mobile equipment to support and meet their performance guarantees. Water Treatment On Wheels. Robert Taylor. GE Infrastructure, Water Process Technologies. Service Contract Categories.