PLASMA ASSISTED PREPARATION OF COAL FOR...
Transcript of PLASMA ASSISTED PREPARATION OF COAL FOR...
PLASMA PLASMA ASSISTED PREPARATION OF COAL FOR COMBUSTIONASSISTED PREPARATION OF COAL FOR COMBUSTIONPLASMA PLASMA ASSISTED PREPARATION OF COAL FOR COMBUSTIONASSISTED PREPARATION OF COAL FOR COMBUSTIONV.E. Messerle, E.I. Karpenko,
Combustion problems Institute, Research Institute of Experimental and Theoretical Physics,
Experience of the practical application of plasmasummarized . Plasma -fuel systems (PFS) have beensummarized . Plasma -fuel systems (PFS) have beenPlasma activation of coal increases the coal reactivityPlasma activation of coal increases the coal reactivityecologically friendly incineration of low -rank coalcombustors of coal -fired thermal power plants in differentcombustors of coal -fired thermal power plants in differentsuccessfully on 29 pf boilers for steam productivitiesstart up and pf flame stabilisation .
THE TECHNOLOGY CONCEPTTHE TECHNOLOGY CONCEPT
start up and pf flame stabilisation .
In the framework of the technology concept
THE TECHNOLOGY CONCEPTTHE TECHNOLOGY CONCEPT
In the framework of the technology conceptfrom the main pf flow and undergone the activation
The mainSketch of the Plasma -Fuel System (PFS) -pf burner with the plasmatron .
PFS is
DC arc plasma
pf burner with the plasmatron .
DC arc plasma
with the
being formedbeing formed
blown
electrodes
electrodeselectrodes
not exceed
coulombcoulomb
plasmatron
from 100
1 – plasmatron ; 2 – primary air/coal mixture (stage 1); 3 – primary air/coal mixture (stage 2); 4 – secondary air; 5 – plasma flame; 6 –
INDUSTRIAL TESTSINDUSTRIAL TESTS
air/coal mixture (stage 2); 4 – secondary air; 5 – plasma flame; 6 –plasma activated pulverised coal flame; 7 – furnace.
PFS have been tested for boilers plasma start up and flame stabilization
testing power coals of all ranks (brown, bituminous, anthracite and
INDUSTRIAL TESTSINDUSTRIAL TESTS
testing power coals of all ranks (brown, bituminous, anthracite and50%, ash—from 15
to 48% and calorific
values — from 6700 tovalues — from 6700 to
25,100 kJ/kg . The boilers
were fitted with differentwere fitted with different
systems of pf preparation
(such as the direct pf(such as the direct pf
injection and systems with
pf hopper). Total 73 PFS
were mounted and tested onwere mounted and tested on
the boilers . The main
summary of these tests issummary of these tests is
that the developed PFS
improve coal combustion
efficiency and decrease
Schematic view of the PFS arrangement on the furnac e of the boiler of 420
efficiency and decrease
harmful emission
from pulverised Schematic view of the PFS arrangement on the furnac e of the boiler of 420of the 4 PFS in action (top view)
4.0
from pulverised
coal-fired TPP.
Specific power3.5
4.0
Unb
urne
d C
arbo
n (
%)Specific power
consumption for3.0
Unb
urne
d C
arbo
n (
%)
plasmatron influence
onto reduction of 2.0
2.5
Unb
urne
d C
arbo
n (
%)
onto reduction of
unburned carbon at
plasma aided1.5
2.0
Unb
urne
d C
arbo
n (
%)
plasma aided
pulverised coal0.00 0.05 0.10 0.15 0.20
1.0
combustion .0.00 0.05 0.10 0.15 0.20
Specific Power Consumption (kWh/kg of coal)
ASSISTED PREPARATION OF COAL FOR COMBUSTIONASSISTED PREPARATION OF COAL FOR COMBUSTIONASSISTED PREPARATION OF COAL FOR COMBUSTIONASSISTED PREPARATION OF COAL FOR COMBUSTIONKarpenko, A.B. Ustimenko *
Institute of Experimental and Theoretical Physics, Almaty, Kazakhstan; *e-mail [email protected]
plasma aided pulverised coal combustion technology isbeen developed to improve coal combustion efficiency .been developed to improve coal combustion efficiency .
reactivity and provides more effective ignition andreactivity and provides more effective ignition andcoal . PFS have been incorporated into a range of
different countries . The technology has been testeddifferent countries . The technology has been testedproductivities ranging from 75 to 670 t/h for the boilers’ oil-free
THE TECHNOLOGY CONCEPTTHE TECHNOLOGY CONCEPT
concept some portion of pulverised solid fuel (pf) is separated
THE TECHNOLOGY CONCEPTTHE TECHNOLOGY CONCEPT
concept some portion of pulverised solid fuel (pf) is separatedactivation by arc plasma in a special chamber—PFS
main element of the
plasmatron . It is
plasma generatorplasma generator
the plasma gas
formed from airformed from air
through the Sketch of the DC plasmatron : 1 – anode; 2 – cathode; 3 – air; 4 – plasma flameelectrodes . The
electrodes erosion does
2 – cathode; 3 – air; 4 – plasma flame
electrodes erosion does
exceed 2*10-9 kg per
coulomb . Thecoulomb . The
plasmatron power varies
100 to 200 kW.
DC plasmatron in action
INDUSTRIAL TESTSINDUSTRIAL TESTS
stabilization in different countries at 17 Thermal Power Plants (TPP). At PFS
their mixtures) were used . Volatile content of them varied from 4 to
INDUSTRIAL TESTSINDUSTRIAL TESTS
their mixtures) were used . Volatile content of them varied from 4 to
Schematic view of the PFS arrangement on the furnac e of the boiler of 420 ton/h steam rate and photograph Schematic view of the PFS arrangement on the furnac e of the boiler of 420 ton/h steam rate and photograph of the 4 PFS in action (top view) .
500
Con
cent
ratio
n (
ppm
)
Specific power
Con
cent
ratio
n (
ppm
)
Specific power
consumption for
400
Con
cent
ratio
n (
ppm
)
plasmatron influence
onto reduction of
300
NO
X C
once
ntra
tion
(pp
m)
onto reduction of
nitrogen oxides
concentration at plasma
0.00 0.05 0.10 0.15 0.20
300concentration at plasma
aided pulverised coal0.00 0.05 0.10 0.15 0.20
Specific Power Consumption (kWh/kg of coal)combustion .