Power Industry SolutionsAs the Power industry becomes more competitive and environmental regulations becomes more stringent, power generators need smart solutions that meet specific water quality requirements to ensure consistent processes and production, while also improving efficiency and reducing waste.From systems that treat cooling tower make-up and boiler feed to waste treatment systems that minimize or eliminate

discharge to the environment, Siemens offers a wide range of equipment and technology solutions that help power

generators ensure consistent, reliable water quality that is also cost effective. 

Our systems are backed by the largest, company-owned branch service network in the industry for unmatched support

throughout the lifetime of your water treatment system.

Featured Solutions / Applications

Intake Screening

Pretreatment Solutions

Boiler Feedwater

Condensate Polishing

Cooling Tower Makeup

Flue Gas Desulfurization (FGD)   Wastewater Treatment  

Featured Articles

Condensate polishing system for power plant in India awarded to Siemens

Siemens to provide condensate polishing system for power project in India

Siemens to provide demineralization and condensate polishing equipment for new power plant in Saudi Arabia  

Innovative water treatment design helps midwest power station go "green" 

Chlorine Dioxide for Cooling Tower   Treatment

Intake ScreeningIntake screens are designed to remove floating or suspended debris in a channel of flowing water.  They protect pumps and other downstream equipment from debris in surface water intakes and other applications.  The three most common types of screens are the Through Flow Screen, Dual Flow Traveling Water Screen and the Center Flow Screen.  

Intake Screening at Power PlantThe major user of intake screens is the nuclear and fossil power generating facilities.  These plants require approximately 500 to 1500 gallons of water per minute per megawatt of rated capacity.  The second largest user would be municipal water treatment plants.

Siemens has supplied thousands of screens to power generators, municipalities and other industries over the past century.  As a recognized leader in the water intake industry, our intake screening systems provide clean, debris-free raw water while minimizing ecological impacts, reducing maintenance problems and extending service life.  

With the only ISO 9001 manufacturing facility in the industry and with extensive engineering and manufacturing resources, Siemens is able to execute projects quickly and efficiently.  

Featured Intake Water ScreensThrough Flow Traveling Water Screens

These submerged screens are perpendicular to the intake flow and collect and carry debris upward to a trough.  Screen

widths range from 2 to 14 ft. (610 to 4267 mm) with vertical centers from 8 to 100+ feet (2440 mm to 30 m).  Screen

mesh openings are sized according to customer requirments and site conditions.

Through Flow Traveling Water Screen

Rex® and Link-Belt® Through Flow Traveling Water Screens are used to remove floating and suspended debris in raw water intake systems. Installed with their submerged screening surfaces perpendicular to the intake flow, water screens collect and transport debris up to the head enclosure, where jets of water flush the refuse into a disposal trough.

Through Flow Traveling Water Screens

Rex® and Link-Belt® Through Flow Traveling Screens are ideal for raw water intake systems with high volume flows

and light or heavy debris conditions. Screening panel widths are available in sizes from 2 to 14 feet. Well depths vary

from 8 to more than 100 feet. Traveling screens can be operated intermittently or continuously, depending on

requirements. Fine mesh screens may be used for increased debris removal. 

Typical applications:

- Power plant cooling systems 

- Water treatment plant raw water intake 

- Paper mill jack ladder effluent channel 

- Irrigation channel screening 

- Cooling tower makeup water systems

Link-Belt® is a trademark of FMC Corporation. 

REX® is a trademark of Rexnord Corporation.

Dual Flow Traveling Water Screens

Essentially the Dual Flow Traveling Water Screens are Through Flow Screens turned 90 degress, putting the

screen surfaces parallel to the intake flow.  This doubles the effective screening area and eliminates possible

downstream debris carryover. 

Dual Flow Traveling Water Screen

The Rex® and Link-Belt® Dual Flow traveling water screens are ideally suited for intakes requiring high volumes of water or heavy duty debris handling. Dual Flow screens are positioned in the direction of the flow and present almost twice the screening area and debris carrying capacity of other designs.

Dual Flow Traveling Water Screen

The Rex® and Link-Belt® Dual Flow screens can be operated continuously or intermittently, depending on

requirements. As the water flows through the screen, baskets, typically made of fiberglass with varying size meshes,

remove debris. The baskets, mounted to two strands of chain, travel to the top of the screen where high pressure jet

sprays of water remove the debris. Depending on capacity, finer mesh screens may be used for increased debris

removal.

Features and Benefits

- Dual flow screens almost completely eliminate debris carryover downstream of the system. 

- Ideal for high water volumes and heavy debris removal. 

Link-Belt® is a trademark of FMC Corporation. 

REX® is a trademark of Rexnord Corporation.

Center Flow Traveling Water Screens

The Center Flow Screens are similar to the Dual Flow traveling screens, but direct the flow from inside to the outside of

the screen.  Side plates block the flow along the outer edges of the channel and direct it inward to the screen with debris

lifted to the top and flushed away by water and gravity.

Center Flow Traveling Water Intake ScreensThe Rex® and Link-Belt® Center Flow traveling water intake screens are positioned so debris is trapped in the direction of the flow. Wall mounted structural components guide the screen tray and baskets. Overhead spray nozzles dislodge debris into removal trays.

The design of the Center Flow traveling water intake screens makes it one of the most cost effective screening systems

on the market, especially for new intake projects.  This design includes wall mounted structural components that guide

the screen trays and baskets.  Overhead spray nozzles dislodge debris from trays and into removal troughs.

Features and Benefits

- Direct drive 

- Roll around boot design 

- Heavy duty screening panels 

- Positive debris removal

Link-Belt® is a trademark of FMC Corporation. 

REX® is a trademark of Rexnord Corporation.

Pretreatment Solutions for Difficult Water Sources

When it comes to treating difficult water sources, like gray water, river water or storm water runoff, we have the solution!  Siemens can help you design the most efficient, reliable and cost-effective system, regardless of how challenging your water treatment needs may be.

Boiler Feedwater TreatmentThe boiler house or steam generation facility is often referred to as the heart of an industrial power plant.  As they are used everyday, 24 hours a day, treatment of boiler feedwater has become the key to successful operation of industrial power plants.

All natural waters contain varying amounts of suspended and dissolved matter as well as dissolved gases.  Likewise,

the minerals in water suitable for drinking which are considered nutritional for the human body, cannot be handled as

well by boilers. Whatever the source, impurities found in source water become an important consideration when used

for steam generation.  Feedwater must be treated to remove impurities to control deposition, carryover, and corrosion in

the boiler system.

Maintaining good feedwater is an important and fundamental aspect of any steam turbine power plant. A plant that

maintains good feedwater achieves the following three benefits:  Help to ensure maximum life out of its boilers, steam turbines, condensers, and pumps.

Reduce maintenance expenses.

Maintain optimal performance

On the otherhand, poor quality water gives poor quality steam.  In the event that the boiler system shuts down, most

processes within the plant will not be operable.  For this reason, proper treatment measures are essential for boiler

feedwater.

Because boiler systems are constructed primarily of carbon steel and the heat transfer medium is water, the potential

for impurities deposit and corrosion is high.  Deposits are seldom composed of one constituent alone, but are generally

a mixture of various types of solid sediments, dissolved minerals, corrosion products like rust, and other water

contaminants. The most problematic impurities to boilers and steam turbines are calcium and magnesium scale, silica,

sodium, chloride, oxygen and iron.  Oil and other process contaminants can form deposits as well and promote

deposition of other impurities.  Localized attack on metal can result in equipment failure or reduced product quality and

therefore, removal of these impurities is aimed at preventing unplanned, forced shutdown or productivity decline.  

For each plant operation, there is an optimum method of treatment. Many factors are involved in proper selection of

feed water preparation and treatment. Principally, these are the requirements of the plant for safe and reliable operation

at an economical treating cost.  Depending on the quality of water, it may be subjected to one or more treatments,

including precipitation/coagulation, lime-soda softening, ion exchange, deaeration, and reverse osmosis. 

Siemens Water Technologies provides a range of products and services to ensure the quality and quantity of boiler

feedwater remains consistent and reliable.  

The first step in the process is often coagulation, or the addition of chemicals to reduce suspended solids, silt, turbidity

and colloids of the raw water.  Coagulation causes smaller, suspended solids to adhere to each other, making them

heavier and forming larger solids which will settle out of the solution.  Typical chemicals used to improve settling rates

and efficiency include aluminum sulfate (alum), sodium aluminate, polyelectrolytes (polymer) and ferris sulfate. 

Chemical precipitation sometimes follows and is a process in which chemical added reacts with dissolved minerals in

the water.  Precipitation methods are used in reducing dissolved hardness, alkalinity, and silica. The most common

chemical precipitation method is lime-soda softening, which not only reduces hardness, but in so doing, alkalinity, total

dissolved solids, and silica are also reduced.  Additionally, a prior coagulation step may not be necessary with the lime-

soda softening process.  Instead, when added to the softening process, coagulants speed up settling of sludge by 25-

50% while also contributing to softening reactions (particularly in reducing magnesium) and removing silica, which tends

to be adsorbed on the floc produced by coagulation of sludge.

Filtration is also necessary for any water treatment process to work properly.  Depending on the treatment process, a

filtration step is necessary for pre-treatment before ion exchange treatment and reverse osmosis or post-treatment,

following chemical precipitation using lime-softening.  Filtration technologies from Siemens include both media systems

as well as ultrafiltration with membrane-based systems.  Removal of these remaining solids is of critical importance

particularly for the prevention of fouling and/or contamination in either the ion exchange resin or reverses osmosis

membrane-based systems which follow in the next treatment phase.  When resins become coated with suspended

matter, they produce shorter run lengths, loose their effectiveness and capacity to regenerate. Likewise, reverse

osmosis membranes can get fouled, leading to reduced efficiency and shorter effective life. 

Siemens provides ion exchange systems for softening and demineralization of the water stream.  These systems

feature ion exchange resins which have a certain capacity for removing ions from water and when their capacity is used

up they have to be regenerated.  Regeneration involves taking the vessel off line, treating it with concentrated solution

of the regenerant and removing the ions from the resins.  The ions are rinsed from the vessel and the resins are

returned to service.

Siemens also offers reverse osmosis treatment systems in replacement of coagulation, precipitation and ion exchange

treatment systems.  RO involves separating water from a solution of dissolved solids by forcing the water through a

semi-permeable membrane. The use of RO has grown rapidly in the industrial sector, but in no industry more quickly

than power generation.  Many plant operators are adopting reverse osmsosis membrane technology for cost and

operational savings, and, the elimination of hazardous chemical handling and safety of personnel.

Boiler Feedwater Pretreatment Technologies for Your Industrial Process Water Applications:

Media Filtration

Membrane/Ultrafiltration

Ion Exchange- softening

Reverse Osmosis

Pressure Filter SystemsSiemens is a leading producer of pressure filter systems.  Pressure filters utilize a pressurized vessel where a fluid stream contacts granular media for physical and/or chemical removal

We design and fabricate pressure filters for a variety of applications and media.  Pressure filters can be used for a variety of conventional filtration media; activated carbon media in any one of several grades and mesh sizes; as well as our oxidative granular ferric hydroxide GFH media for arsenic removal.

Pressure filter can be made to ASME code standards in our certified fabrication facility.  We provide pressure vessels as stand-alone systems, or we can provide assistance and components for entire systems.

Vantage™ High Flow Multimedia FiltersVantage™ multimedia filters offer flexible, reliable and feature-rich removal of particulate matter from feed water.

Vantage™ Pre-Treatment – Industrial (PTI) series multimedia filters offer a flexible, reliable and feature-rich way to

remove particulate matter from your feedwater.  These systems are available in Simplex, Duplex or Triplex

configurations, and are pre-engineered, pre-assembled and factory-tested units to minimize installation and startup

time. Each configuration is controlled by a main control panel with solenoid panels on the other vessels.  Multimedia

filters are available in either PVC or 316L stainless steel face piping and internals.  Vessel diameters range from 72” to

120” and have a common 60” side sheet for high flow systems.

Vantage™ PTI High Flow Multimedia Filters are available in three models:

Plus (P) - Controlled by Siemens PLC and user friendly touch screen HMI, PVC face piping and internals

Deluxe (D) - Controlled by Siemens PLC and user friendly touch screen HMI, 316L stainless steel face piping

and PVC internals Select (S) - Controlled by Siemens PLC and user friendly touch screen HMI, 316L stainless steel face piping

and internals; turbidity meter comes standard with this model

 

Air Scour is also available with all models. The Select model comes standard with 316L stainless steel air scour laterals.

The Plus and Deluxe models can be ordered with these laterals as an option. All models come equipped with the drain

down piping, which is controlled by the main control panel. A dry contact closure is available for controlling the

customer-provided air source.

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Features and Benefits

Features 

Separate source backwash option

Adjustable drain line flow control

2006 IBC seismic rating for anchorage

Turbidity meter option on Plus and Deluxe models

Thermal pressure relief valve

Available in ASME code or non-code vessels

Largest 120” system meets highway transportation requirements

Larger 14” x 18” manway

96” and 120” vessels have a 14” x 18” manway on the side sheet

3” sluice port

Carbon Steel – Epoxy lined and coated vessels

 

Benefits

Fully automated air scour to minimize backwash time and water usage

Automated vent for easy start up and fast drain down

Sight glass on drain line to minimize backwash water usage

Fast delivery to meet demanding schedules