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Contenido archivado el 2022-12-27

NEW TECHNOLOGY OF PULSE ENERGIZATION ON HIGH TEMPERATURE ELECTROSTATIC PRECIPITATOR FOR SOLID FUELS ASHES

Objetivo

To install in an industrial boiler a new scheme for dedusting the flue gas from fly ashes. The innovation consists in the use of a high temperature (320-350 deg. C) electrostatic precipitator energized with pulse systems thus obtaining considerable saving (45%) in the energy consumed without affecting the collection efficiency of more than 99.9%. The ashes are removed immediately downstream of the economizer and so the Ljungstroem rotary air preheater is not fouled and therefore the shutdown of the power plant for the cleaning and blowing is also reduced.
As from 18.03.93 in the presence of a RICO technician and with the SNOX plant fed with the flue gases coming from the pet-coke combustion, tests and measurements have been carried out of the parameters and of the electrical consumption of the electrostatic precipitator with traditional supply or with the pulse supply system turned on.
It may be concluded, that it is possible to operate all 5 filter fields with pulse energization 1/7 mode.
The active power input of the complete precipitator amounts by this approx. 10 kW, in opposite to continuous operation, where the active power input amounted 227 kW. The difference between continuous operation and at equal precipitation possible pulse operation amounts more than 95%. This clear positive results were not expected.
A flow of 100,000 Nm3/h of combustion flue gases (equivalent to about 3 MWe) from boiler No. 1 of Gela plant is taken downstream of the economizer at a temperature of about 320 deg. C and after heating with a gas burner located on the line it is sent to the high temperature electrostatic precipitator where the ashes contained at a concentration of 10 g/Nm3 are electrostatically precipitated to values around 10 mg/Nm3. The electrostatic precipitator which operates at 400 deg. C is fed with a semi-pulse electric feeding system which allows to verify the voltage increase in the precipitator with a certain frequency, up to the limit value present according to the ash resistivity characteristics. The possibility of variating also the feeding cycles beyond the limit value of voltage allows to optimize the quantity of flow necessary to load the ash particles that shall be retained by the collection electrostatic precipitator.

Convocatoria de propuestas

Data not available

Régimen de financiación

DEM - Demonstration contracts

Coordinador

SNAMPROGETTI SPA
Aportación de la UE
Sin datos
Dirección
Viale Alcide De Gasperi 16
20097 SAN DONATO MILANESE
Italia

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Coste total
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