experience driving valmet advanced wte solutions forward..."valmet's cymic boiler...
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Experience driving Valmet advanced WtE solutions forward
Ari KokkoDirector, Technology and R&D
Valmet Technologies Oy
Towards circular economy
2
Linear economy Circular economy
Waste
Consumption
Distribution
Production
Resource
extraction
A circular economy aims to keep products, components and materials
in a continuing cycle instead of disposal => Waste is minimized
Source: European Union© Valmet | Ari Kokko
Collect the waste
Mechanical treatment
Fire with high
efficiency
Clean flue gases and
ashes
Separate metals, glass
and inerts
Recycle (sell) metals and
glass
Waste value chain
Valmet solutions for WtE >30 references
CYMIC(CFB technology)
• Up to 600 000 t/a RDF
• 520 °C, 90 bar
• RDF, recycled wood,
TDF, multi-fuel
RecycPower(CFB technology)
• Up to 100 000 t/a RDF
• 11 MWe (gross)
• Modular design
Air emission control
Automation
© Valmet | Ari Kokko3
From MSW to RDF
Mechanical
treatment
Organic separation
if applicable
RDF silo
MSW => RDF
– 90% combustables
– 10% recycleable+inerts
RDF fuel size requirement
– 100% <200 mm
– 90% < 90 mm
=>To recycling
CYMIC for WtE - Reliable design
Reliability means low need for maintenance and high annual operation
hours
Normal recommended maintenance sequence is one service outage
and one inspection per year
– Inspection (max one week) is to prepare for annual service outage
– Service outage (2-3 weeks) when all maintenance is done
– All superheaters constructions are easily replaceable (lifetime 3-5 years)
Annual operation hours are >8000 h
© Valmet | Ari Kokko5
Bottom ash containerBottom ash chute
CYMIC for WtE – reliable designHigh reliability in Langerbrugge
6
Stora Enso Langerbrugge nvGent, Belgium
Steam 125 MWth
45 kg/s60 bar475 °C
Fuels RDF 320 kt/a
Start-up 2010
2011 2012 2013 2014
Boiler in operation h 8323 8213 8341 8331
Boiler unavailability h 88 11 70 67
Boiler reliability % 99,0 99,9 99,2 99,2
© Valmet | Ari Kokko
CYMIC for WtE – more electricity
More electric power from same amount of waste
© Valmet | Ari Kokko7
In Valmet CFB boiler the steam values can be as high as 520°C and
90 bar => higher power output
Final (tertiary) superheater is located in cyclone loop seal in order to
mitigate high temperature corrosion
Final superheater has a special double tube design
– Despite high steam parameter the lifetime of final superheater is 3-5 years
Ammonia
Limestone
CYMIC CFB boiler
CYMIC for WtE – excellent emission performance
Near-zero emissions plant in Langerbrugge
8
Component Unit Guaranteed Measured
NO as NO2 mg/Nm3 <125 40
CO mg/Nm3 <50 0
Particulates mg/Nm3 <10 0.1
SO2 mg/Nm3 <50 n.d.
HCl mg/Nm3 <10 0.1
HF mg/Nm3 <1 n.d.
Heavy metals mg/Nm3 <0.5 <0.008
PCDD/F ng/Nm3 <0.1 <0.1
Stora Enso Langerbrugge nv,
Gent, Belgium
Steam
Fuels
Start-up
125 MWth
45 kg/s
60 bar
475 °C
RDF
2010
Activated
carbon
Sodium
bicarbonate
© Valmet | Ari Kokko
CYMIC for WtE – fuel flexibility
Co-firing option
CFB’s big benefit is fuel flexibility
Typical waste fuel properties (CFB):
– Calorific value 6 – 25 MJ/kg
– Moisture content < 50%
– No support fuel needed
Possible to co-fire RDF with other fuels or to have following fuels as back-up fuel:
– Biomass
– Coal
– Recycled wood
– Tyre derived fuel (TDF)
– Paper mill rejects
– Any mixture
© Valmet | Ari Kokko9
Recycled woodCoalWood biomass
TDF
CYMIC for WtE – lower CAPEX
21.5.2019 © Valmet | Ari Kokko10
CFB total EPC price is lower compared to grate firing
– Plant as erected and including civil works
– Includes fuel preparation system and flue gas cleaning
Source: Leading world-wide Consultant company’s study
0
50
100
150
200
250
300
350
400
450
330 kt/a 700 kt/a
EP
C c
ost,
M€
MSW in
CAPEX comparison
CFB Grate firing
CYMIC for WtE – Recent references
Customer driver: Large size single line, reliable design
Mälarenergi AB,
Västerås, Sweden
Steam 155 MWth
56 kg/s
74 bar
470°C
Fuels MSW (480 kt/a) => RDF (400 kt/a)
Start-up 2014
11 © Valmet | Ari Kokko
The largest single-line
WtE unit in the world
CYMIC for WtE – Recent referencesCustomer driver: High reliability and efficiency
12
Zibo Green Energy New
Energy Co., Ltd
Zibo, China
Steam 37 kg/s
80 bar
520 C
108 MWth
Fuel RDF (300 kt/a)
Start-up 2018
© Valmet | Ari Kokko
• Fuel sizing good
• Calorific value 8-8.5
MJ/kg (design >10
MJ/kg)
• The first year
availability: 100% of
requested time
CYMIC for WtE – Recent referencesCustomer driver: High efficiency and reliability
13
Urumchi Jinghuan Environmental
& Energy Co, Ltd
Urumchi, China
Steam 2 x 125 MWth
Fuel RDF
2 x 500 000 t/a MSW
Start-up 2021
© Valmet | Ari Kokko
Valmet and Urumchi Jinghuan Environmental & Energy Co., Ltd. have signed a contract
regarding a delivery of two boiler plants fired with refuse-derived fuel (RDF) for a
greenfield waste-to-energy plant in Urumchi, China. Installation of the boiler is scheduled
to begin in March 2019. Heat and power production will start by the end of 2019.
"Valmet's CYMIC boiler technology offers the most reliable solution for RDF. We expect
to achieve high economic efficiency with less need for maintenance and fewer
production shutdowns," says Wang Haoyu, Deputy General Manager and Chief
Engineer of the plant. "At first, we didn't believe that an RDF-fired boiler could be this
large and efficient, especially for handling China's extremely demanding municipal solid
waste. But after visiting Valmet's excellent RDF boiler reference in China, we are fully
convinced.
The boiler plant will burn one million tons of RDF (produced from 100% municipal solid
waste) every year. Natural gas is used only for start-ups. The chlorine and alkaline
content in the RDF fuel is very high, but Valmet's circular fluidized bed technology
effectively controls emissions and corrosion.
Summary
Circulating fluidized bed (CFB) technology provides an excellent choice to fulfil Circular
Economy targets
– Firing only the fraction which is left after recycling
CFB provides
– Higher efficiency
– High reliability and low maintenance
– Lower emissions
– Fuel flexibility
– Wide capacity range
– Lower CAPEX
© Valmet | Ari Kokko14
