Feed water pumps (FWP) for solar power generation

Optimum designs to bridge high differential heads

Feed water pumps (FWP) pump feed water from the de-aerator through the HP heaters to the solar steam generator. The major characteristic of FWP is their high differential head. The FWP are usually horizontal ring section type, but depending on customer requirements, they can also be barrel or axially split type.

Solar panels
For Hybrid integrated solar combined-cycle (ISCC), the following pumps are suitable: MD, MC, GSG, MSD For further solar power applications, Sulzer provides the following ring section as well as barrel and axially split pumps as feed water pumps for parabolic trough without heat storage power plants:
MBN MC MD
Capacities
Up to 700 m3/h /
3,080 USgpm
Up to 1,000 m3/h /
5,000 USgpm
Up to 1,000 m3/h /
5,000 USgpm
Heads Up to 900 m /
2,950 ft
Up to 1,750 m /
5,500 ft
Up to 2,400 m /
8,200 ft
Pressures
Up to 100 bar /
1,450 psi
Up to 180 bar /
2,610 psi
Up to 350 bar /
5080 psi
Temperatures Up to 180°C /
355°F
Up to 180°C /
355°F
Up to 210°C /
410°F
GSG MSD
Capacities
Up to 900 m3/h / 4,600 USgpm Up to 3,200 m3/h / 14,000 USgpm
Heads Up to 2,600 m / 10,000 ft Up to 2,900 m / 9,500 ft
Pressures
Up to 300 bar / 4,500 psi Up to 300 bar / 4,400 psi
Temperatures Up to 425°C / 800°F Up to 200°C / 400°F

Products

  • GSG diffuser style barrel pump
    The GSG pump is the least costly form of ISO 13709 / API 610 Type BB5 high-pressure barrel pumps. The GSG back-to-back rotor stack is supplied on low- density services where rotor stability is critical.

  • MBN multistage ring section pump
    The MBN pumps are ideal for use in medium-pressure applications. They have a big variety of nozzle position options, thus providing flexibility during installation and simplifying the piping design.

  • MC high pressure stage casing pump
    M-series pumps have a modular design thus allowing Sulzer to find the most efficient solution to meet customer requirements.

  • MD high pressure stage casing pump
    Both investment costs and lifecycle costs are taken into consideration when designing the optimum possible pump as an optimized hydraulic design guarantees maximum efficiency.

  • MSD axially split multistage pump
    The MSD pump has the broadest hydraulic coverage of any BB3 type multistage pump in the market. There are over 10 000 MSD pumps installed in product pipelines, boiler feed, water injection and even nuclear safety-related services around the globe.

Processes and applications

Heliostat Central Tower with Direct Steam Generator (DSG)

Heliostat central tower with direct steam generator (DSG)

Heliostat central tower is the most promising option for the future as it needs less space and can be more efficient than parabolic trough. It allows to generate either low rate saturated or high rate superheated steam.

Heliostat with Central Tower and Direct Steam Generation

Heliostat central tower generates electric power from sunlight by focusing concentrated solar radiation on a tower mounted heat exchanger (receiver). The system uses thousands of sun-tracking mirrors called heliostats to reflect the incident sunlight onto the receiver. In this case, the primary Heat Transfer Fluid (HTF) is water that will directly convert into steam.

Our experienced service engineers help you to maintain your rotating equipment at the highest level of availability and reliability.

Heliostat Central Tower with Molten Salt and Heat Storage

Heliostat central tower with molten salt and heat storage

Heliostat central tower is the most promising option for the future as it needs less space and can be more efficient than parabolic trough. It allows to generate high-rate superheated steam.

Heliostat with Central Tower and Molten Salt Heat Storage

In this variant, the primary Heat Transfer Fluid (HTF) is cold molten salt at around 295 ºC that are circulated through the tower mounted heat exchanger (receiver). Molten salts are heated up there to around to 565°C which allows to generate high rate superheated or even supercritical steam. A part of the hot molten salt is stored in the hot molten salt tank to be able to release it after the sunset; this system extends the operating time of the CSP plant by some additional 6-7 hours.

Our experienced service engineers help you to maintain your rotating equipment at the highest level of availability and reliability.

Hybrid Integrated Solar Combined-Cycle (ISCC)

Hybrid integrated solar combined-cycle (ISCC)

A hybrid between a fossil-fired power plant (i.e. gas-fired combined-cycle) and a CSP plant. The solar field (either parabolic trough, linear Fresnel reflector or heliostat central tower) provides additional steam during the hours of high sun radiation to feed the main steam turbine. This configuration is typically used for power increase of any kind fossil-fired power plant.

Hybrid Integrated Solar Combined Cycle (ISCC)

In a combined-cycle plant, the high temperature exhaust gas from the turbine passes through the heat recovery steam generator (HRSG) from which high-pressure steam is addressed to a steam turbine. In ISCC installations, additional thermal energy from the solar steam generator is injected into the HRSG of a conventional combined-cycle plant. This boosts steam production and consequently electrical output at relatively low extra cost.

Our experienced service engineers help you to maintain your rotating equipment at the highest level of availability and reliability.

Linear Fresnel Reflector

Linear Fresnel reflector

Linear Fresnel reflector is the receiver technology having the lowest investment cost. The cost savings come from the inexpensive planar mirrors and the very simple tracking system used.

Linear Fresnel Reflector with Direct Steam Generation

The linear Fresnel reflector width can easily be three times the width of parabolic troughs, thus, the same amount of energy can be collected with a fraction of the absorber tube length. Direct Steam Generation (DSG) usually allows only to generate low rate saturated steam.

Our experienced service engineers help you to maintain your rotating equipment at the highest level of availability and reliability.

Parabolic Trough with Molten Salt Heat Storage

Parabolic trough with molten salt heat storage

Parabolic trough with heat storage has been widely tested since the early 2000's in several locations in Spain. A parabolic trough is a type of solar thermal energy collector; it is constructed as a long parabolic mirror with a tube running its length at the focal point.

Parabolic Trough with Molten Salt Heat Storage

In this variant, a part of the thermal oil used as primary Heat Transfer Fluid (HTF) is circulated through a heat exchanger where the heat is transferred to the molten salts circulated in a secondary circuit. This heat is stored in the hot molten salt tank to be able to release it after the sunset which extends the operating time of the CSP plant by some additional 6-7 hours. The working temperature is conditioned by the thermal oil optimum at around 350 ºC allowing to generate only low rate steam.

Our experienced service engineers help you to maintain your rotating equipment at the highest level of availability and reliability.

Parabolic Trough without Heat Storage

Parabolic trough without heat storage

Parabolic trough without heat storage is the most mature receiver technology as it was widely tested since the late 80's in the Mojave Desert (USA). A parabolic trough is a type of solar thermal energy collector. It is constructed as a long parabolic mirror with a tube running its length at the focal point.

Parabolic Trough without Heat Storage

In a parabolic trough plant, sunlight is reflected by the mirror and concentrated on the tube where thermal oil used as primary Heat Transfer Fluid (HTF) is circulated. The thermal oil optimum working temperature is around 350 ºC which allows to generate low rate steam. These CSP plants without heat storage can operate only during the hours of high sun radiation.

Our experienced service engineers help you to maintain your rotating equipment at the highest level of availability and reliability.

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