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7/29/2019 CYMIC

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CYMIC boilers

7/29/2019 CYMIC


CYMIC boilers- Circulating Fluidized Bed (CFB)

combustion technologyCo-combustion of different fuel types

High fuel flexibility is the foremost ad-vantage offered by the CYMIC boilers.They are designed to combust fuelsranging from 100% coal to 100% bio-mass and any combination in between.Most of the CYMIC boiler references

are multifuel cases, often co-combust-ing fossil fuel (coal, pet coke) withbiomass.

The CFB process provides excellentemission control achieved through aconstant and relatively low combustiontemperature. NOX emissions can furtherbe reduced by ammonia injection intothe cyclone inlet. Desulfurisation withlimestone injection into the furnace en-ables the combustion of high sulfur fuels

with low SO2 emissions, and limestoneconsumption can be further reduced byinstalling a scrubber after the boiler.

Co-combustion of coal and biomassprovides several advantages.

In comparison to coal combustionLower net CO2 emissionLower limestone consumption

In comparison to biomass combustionLower potential for high tempera-ture corrosionNo bed agglomerationStabilises combustion conditionsfor diffi cult-to-feed fuels (enhancedemission performance)

Multifuel operation also increases opera-tion reliability and keeps fuel costs downby offering several fuel alternatives.

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Stricter emission limits and

a wide range of low-grade

fuels drive the development

of Circulating Fluidized Bed

(CFB) technology. Metso Power

has dedicated its research and

development to this area, and

is today a forerunner in CFB

development.

Today’s most advanced

CFB design originates from

industrial applications, andfeatures high controllability

and reliability. It fulfils the

power generation segment’s

demands for less expensive

emission control and lower

lifecycle costs.

Metso Power’s CFB boiler iscalled CYMIC.

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Bed Ash Cooler (BAC)

An integrated bottom ash cooler is usedwith high-ash and/or high-sulfur fuel,when large amounts of bed ash must beremoved. The bed ash is cooled down to200°C to minimise heat loss. The BAC de-sign is integrated with the boiler furnace,

by a water-cooled membrane wall.

Loop seal superheater

In the CFB process superheater sur-faces can be positioned immersed inthe boiler bed material. A loop seal su-perheater is used in order to protect thesuperheater surface against corrosion orto provide additional heating surfacein case of a high steam temperaturerequirement.

Wide size range

From 50 to 600 MWth

High availabilityLow emissions

Co-combustion of biomass and coal

Minimised operational costs through

a wide range of fuel optionsFrom biomass to pet coke

Proven reliability and lifecycle

management

19 boilers (60-151 kg/s) delivered tothe same customer

Readiness for scaling up

Design ready for 350 MWe

(850 MWth)

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CFB development drivers:

Lower lifecycle costHigh reliability, less maintenanceAdvanced components:

Membrane wall cyclonesIntegrated Bed Ash Cooler (BAC)Loop seal superheater

High-effi ciency cyclones

Cyclone design is the heart of the CFBprocess. The CYMIC boiler design isbased on standard cyclone and loopseal components, both of which featureeither water or steam cooled membranewall design. Membrane cyclones haveseveral benefits like keeping the amountof refractory very reasonable, smallerheat losses and allowing a reductionin size of the other surfaces while par-

ticipating in heat transfer. CYMIC

boilercyclones feature a round shape andhigh effi ciency. The cyclone design usedin the CYMIC boilers provides excellentseparation effi ciency in al l boiler sizes.

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Multi-Fuel Experience

Ref. unitsCoal-based fuels

Bituminous Coal 35Brown coal (Lignite) 1Petroleum Coke 5Gob (Bituminous Coal Waste) 5

Culm (Anthracite Mining Waste) 1Sub Bituminous Coal 3

Low calorific fuels

Bark Peat 16Sludge 2Wood waste 17Wood chips 2Forest residue 4

Other fuels

TDF (Tyre Derived Fuel) 8RDF (Refuse Derived Fuel) 3

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Metso PowerA forerunner in fluidized bed boilersto power plants for combustion of biomass, coal and other fuels.A global leader in chemical recoverysolutions for pulp and paper mills.

Metso Power at your service

Austria, Linz +43 732 650 840Brazil, Curitiba +55 41 3341 4444Finland, Tampere +358 20 14121Finland, Turku +358 2 517 0600Finland, Vantaa +358 40 868 4040France, Paris +33 1 3451 6688Germany, Raesfeld +49 2865 909 610Poland, Warsaw +48 22 666 0311Russia, Moscow +7 095 775 28 52Singapore +65 6879 9500South Africa, Durban +27 31 303 1098Sweden, Gothenburg +46 31 50 10 00

Sweden, Sävsjö +46 382 158 20Sweden, Örnsköldsvik +46 660 780 00USA, Charlotte, NC +1 704 541 1453USA, Fairmont, WV +1 304 534 5690

www.metso.com

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