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Variant 5 – Ekonomizer
Variant 4 provides for the installation of a heat exchanger, economizer (ECO) for additional
utilization of flue gas heat before discharge into the chimney. The flue gases would be cooled
by reverse water from the district heating network.
The measured operating data show that the temperature of the flue gases leaving the boiler
room varies between 120°C and 180°C, depending on the current operating power. The
temperature of the return water from the mains varies between 60° and 80°C.
According to the calculation prepared for us by the boiler designer, operating one boiler at full
power of 2,500 kW could be obtained from flue gases approx. 150 kW of heat, which accounts
for about 6% of power. Accordingly, less fuel would be used to heat the water in the boiler.
However, since neither of the two wood boilers operates at full power all the time, the savings
would be slightly less. From an edited heat consumption diagram (Napaka! Vira sklicevanja ni
bilo mogoče najti.) and the measured operational data shall be followed by the average annual
power of the CA system. 1,710 kW, with an annual production of 7,955 MWh of heat. For this
power, the table below estimates heat savings, and hence fuel. The transmission would operate
at an average annual power of approx. 80 kW, from flue gases could be obtained approx. 374
MWh of heat, representing approx. 4.7% of the predicted heat production. Fuel consumption
would also be reduced by this much, which represents savings in this case.
Since the boilers rarely operate at the same time, the laptop would be dimensioned to the
maximum power of one boiler. Since the boilers already have a common flue gas outlet from
the boiler room, the transmission would be able to exploit both boilers up to their total power
(the amount of flue gases) for which it would be dimensioned. Its size is estimated at ca. 800
mm in diameter and 3.8 m in length. The laptop could be installed between the electrofilter
and the traction fan, parallel to the existing smoke pipeline, which, if necessary, would serve
as a bypass for all or part of the flue gases. A by-pass hatch would also be installed for this
purpose. The existing traction fan should be sufficient to overcome the additional resistances
of the laptop, with half the amount of flue gases for which it is dimensioned.
From the return pipeline of the remote network, a branch is carried out and part of the water
is guided through the laptop and a little heated return to the collection collector of the return.
The circulation would be provided by a smaller pump that would overcome the resistances
through the pipeline and the laptop.
Table Napaka! V dokumentu ni besedila z navedenim slogom.-1:
by installing a flue gas/water heat exchanger
Estimation of savings
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More detailed data are given in the summary table Napaka! Vira sklicevanja ni bilo mogoče
najti., which provides key data for comparing individual variants and calculating their economic
performance.