The Inova Grate - Hitachi Zosen Inova AG

The Inova Grate
New Standard in Combustion Technology
The Inova Grate New Standard in Combustion Technology
The Inova Grate – New Standard
in Combustion Technology.
Designed for superior cost-effectiveness and comprehensive environmental soundness,
the latest Hitachi Zosen Inova grate fulfils all customer requirements expected from an efficient,
state-of-the-art combustion system for energy-from-waste applications.
Backed by the know-how and decades of experience accrued by the Hitachi Zosen Inova Group‘s
leading combustion specialists, the Inova grate
defines the new benchmark in combustion technology for energy-from-waste plants.
The Inova grate: cost-effective, simple
and reliable
The Key Enhancements
at a Glance
| Improved Cost-effectiveness Thanks
to Optimised Design and Improved Materials
•Improved materials and design modifications to
critical wear parts ensure a longer service life,
higher availability, and simplified maintenance
procedures.
•Longer grate blocks result in better space
utilisation and simplify access to moving parts.
This expedites assembly, maintenance, and
service work.
•The smaller inclination angle of the grate reduces the overall height of the structure as well
as construction costs.
•Smart assembly procedures make overhaul work
easier.
Thanks to these optimisation measures, the Inova
grate is a ­future-oriented, modern and effective
high-performance combustion system.
The Inova grate element:
robust and maintenance-friendly
| The Inova Grate –
Reliable and S table in Operation
The fuel from the waste pit is fed to the combustion chamber via the feed hopper. The ram feeder
uniformly distributes the fuel across the four-zone
grate. The process steps – drying, ignition, combustion, and burnout – can be controlled separately.
Swift adjustment of airflows and grate motion in
every zone at all times responds to process fluctuations. The inclination of the grate, the drop-off after the main combustion zone, and the ­horizontal
burnout zone ensure excellent burnout of all waste
fractions.
Three Configurations for Optimised Burnout
The basic variant for calorific values between
approx. 8 and 14 MJ/kg consists of three grate
zones with an inclination of 10°, followed by
a drop-off at the end of the third zone, and a
horizontal burnout zone.
1
calorific values are low, ranging from
If
4.5 to 11 MJ/kg, a further drop-off between
zones 1 and 2 promotes drying and timely
ignition.
2
For high calorific values between 10 and
18 MJ/kg, typically found in Refuse Derived Fuel
(RDF), the Inova grate is built with a full-length
inclination of 10 °, without drop-offs.
3
| Excellent Burnout Quality
for Every Fuel Quality
The Inova grate is customized so that it can continually guarantee excellent combustion control
and burnout quality to match the respective
calorific value range.
Three configurations ensure the reliable treatment
of fuels with different calorific value. With an inclination of 10° in the drying and main combustion
zone as well as the horizontal burnout zone, fuels
are continuously conveyed and treated according
to the process needs. This results in homogeneous
combustion and optimised burnout of different
waste qualities.
| Combustion is Controlled even when
Fuel Compositions Fluctuate
Regardless of the quality of the waste, the individually controllable ram feeders ensure consistent fuel bed thickness on the grate resulting in a
uniform thermal load on the grate, a ­more stable
combustion process, and a long grate service life.
The selection of the most suitable grate optimises
the inter­action of ram feeder elements, grate advance speeds, dwell times and stroke lengths, and
the distribution of primary and secondary airflows.
This guarantees:
•Smooth plant operation with constant steam
production
•Uniform temperature profiles and low NOx
generation
•Low local thermal loads
•Excellent bottom ash quality
•Total burnout of flue gas
An optional array of pyrodetectors in the roof of
the burnout zone monitors the quality of bottom
ash and the location of the principal combustion
zone on the grate. A computer determines the
­optimum combination of process interventions
to consistently ensure high bottom ash quality.
| Flexible Grate Cooling Optimises
Operating Costs
Depending on the requirements, the grate is either
air-cooled or configured for combined water/air
cooling. While the air-cooled grate is adequate for
low calorific values, water-cooled grate ­elements
in the first two zones ensure more precise process
control for high calorific values, resulting in a
longer service life. The coolant piping is optimally
integrated into the design of the grate.
The Inova Grate New Standard in Combustion Technology
Hitachi Zosen Inova AG I Hardturmstrasse 127 I P.O. Box 680 I 8037 Zurich I Switzerland
Phone +41 44 277 11 11 I Fax +41 44 277 13 13 I [email protected] I www.hz-inova.com