Rights from the beginning of its operation Energotechnika has been handling production and
construction of boiler plants fired by solid fuels, and in particular hard coal and biomass. In
response to needs of the market, in connection with implementation of the Directive of the
European Parliament EU 2015/2193 of 25 November 2015 on the limitation of emissions of
certain pollutants into the air from medium combustion plants, Energotechnika has developed
a new family of coal fired boilers that meet the most stringent environment protection
requirements.
Line HEWB series E1015 boilers with economisers are modern water stoker boilers fired by
hard coal dust with a three-pass fuel gas flow with reduction of emission of noxious
substances. This type of boilers, with a maximum capacity of 30MW, are designated for
production of hot water with parameters of 150/70°C.
The first boiler pass is the furnace chamber, in the second vertical one convectional bund has
been installed, while the third pass is constituted by a detached full-flow water heater
(economizer) in steel sheet casing. The boilers are executed on the basis of sheet piling
technology, which allows boiler operation on negative air pressure, without the additional
losses caused by air suction to the inside. The device is self-bearing, footed on eight support
pillars.
The boiler is originally furnished with a complete flue gas dust collection, denitrification and
desulphurisation system. The dust collection system comprises a preliminary dust collector,
multicyclone and a bag filter with a bag purification system, and with an exhaust fan and with
flue gas channels between the boiler and the chimney.
Reducing the contents of nitrogen compounds takes place on the basis of the flue gas
recirculation system. Introduction to the furnace chamber of a part of flue gas streams flowing
out from the boiler causes lowering of the combustion temperature and as an effect reduction
of nitrogen compound contents. In addition, in the upper part of the second pass connecting
pipes are provided for injecting ammonia water (SNCR), as an additional option for reducing
nitrogen contents. Fuel gas desulphurisation takes place in the dry method by injecting
sodium carbonate or bicarbonate to the flue gas duct prior to the bag filter.
Boilers from the HEWB family have been equipped with the most modern automation
system, in accordance with binding regulations. The control and instrumentation cabinet is
furnished with circuits to control all boiler systems, and in particular:
Thanks to the automation of the control proves of a boiler, units type HEWB are characterised
by an extremely high efficiency and regulation capacity within the range of 30 to 100% of
nominal load.
| Basic parameters | |
| Range of offered boiler capacity | 3,5-30MW |
| Regulation capacity | 30-100% |
| Efficiency at nominal capacity | >88% |
| Efficiency at a load of 30% | >86% |
| Dust emission (at 6% O2) | <30mg/Nm3 |
| SOx emission (at 6% O2) | <400mg/Nm3 |
| NOx emission (at 6% O2) | <300mg/Nm3 |
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