Component 85: Electrostatic Precipitator

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Component 85: Electrostatic Precipitator

Specifications

Line connections
1	Flue gas inlet
2	Flue gas outlet (filtered)
3	Dust (Flue gas) outlet (filtrate)
4	Required electrical power

General User Input Values Characteristic Lines Physics Used Displays Example

General

Component 85 handles energy and mass balances of an electrostatic precipitator.

You can choose from four calculation modes: See Notes for FDUST (User Input Values)

The necessary electric power can be calculated from the normalized electrical power and will be included in the energy balance.

The electrostatic precipitator considered gaseous ashes.

"Standard“ quantities

In practice, certain quantities are often related to “standard conditions“; depending on the context, different standards are used.

The options for determining the standard conditions (to specify quantities related to standard conditions ) have been extended :

The input for FNORM determines the reference pressure and reference temperature:

• 1 bar, 15°C (Ebsilon standard)

• 1.01325 bar, 0°C (DIN 1343)

• 1.01325 bar/14.696 psia, 15°C/59°F (ISO 2533)

• 1 bar, 20°C

• 1 bar, 0°C

• 1.01325 bar, 20°C (German “TA Luft”)

• 14.696 psia, 60°F (often used for “standard cubic feet”)

it is also possible to

• specify the reference conditions by means of measured values of the type ”Reference pressure“ (FTYP=13) and ”Reference temperature“ (FTYP=26),

and it is possible to do without the standardization:

• Use of the current pressure and the current temperature of the line.

Adopting the reference values from the general settings is not reasonable because other results might be generated on another computer.

The flag FNORMW decides if for determining the standard volume only the dry fraction of the gas is to be considered, or if the water fraction is to be taken along.

The flag FNORMO2 enables a conversion to a reference oxygen concentration. There are the following variants:

• FNORMO2=0: Actual O2 concentration is kept, whereby this concentration refers to the dry or humid flue gas depending on the setting
of the flag FNORMW.

• FNORMO2=1: the reference concentration is taken over from the model settings, whereby this concentration refers to the dry or humid flue gas depending on the setting
of the flag FNORMW.

• FNORMO2=2: the reference concentration is taken from the component specification value O2REF, whereby this concentration refers to the dry or humid flue gas
depending on the setting of the flag FNORMW.

• FNORMO2=3: : the reference concentration is taken over from the model settings, whereby this concentration always refers to the dry flue gas, independent of the
flag FNORMW.

• FNORMO2=4: the reference concentration is taken from the component specification value O2REF, whereby this concentration always refers to the dry flue gas,
independent of the flag FNORMW.

Note:

In this component, the specification value M2DV2N refers to the normalized concentration (in the design case), whereas result value M2DV2 was not converted

to standard conditions. This has been changed : M2DV2 is the dust concentration at the outlet converted to standard conditions (in the current load case).

A new result value RM2DV2 has been implemented for the actual dust concentration.

User Input Values

FDUST	Flag for defining the filtering Like in Parent Profile (Sub Profile option only) Expression =0: specified by total separation ratio M3M1N =1: specified by dust exhaust concentration M2DV2N =2: Dust concentration in the exhaust gas, calculated from geometry (ACOLL, MAXFGB, ACTFGB) - " Deutsch formula" =-1: Identification mode - Identification of dust collecting area ACOLL from dust exhaust concentration given by measurement point IPSDUST
M3M1N	Total separation ratio (nominal), e.g. (fly ash of line 3) / (fly ash of line 1)
M2DV2N	Normalized molar dust exhaust concentration (nominal)
IPSDUST	Index of pseudo measurement point for dust concentration (only in identification mode)
ACOLL	Dust collecting area
SIZCON	Constant (dust sizing constant) in the modified "Deutsch formula"
MAXFGP	Maximum number of dust collecting areas, which can be in operation
ACTFGP	Actual number of dust collecting areas, which are in operation
QM2D	Specific electrical power, e.g. required electrical power per fly ash mass flow
DP12N	Pressure drop between line 1 and 2 (nominal)
FMODE	Calculation mode design / off-design Like in Parent Profile (Sub Profile option only) Expression =0: GLOBAL =1: Local off-design i.e. always off-design mode, even when the model is calculated in the design mode.
FNORM	Flag to define a combination of reference pressure and reference temperature Like in Parent Profile (Sub Profile option only) Expression =0: EBSILON default (1bar, 15°C) =1: DIN 1343 (1.01325bar, 0°C) =2: ISO 2533 (1.01325bar, 15°C) =3: DIN 1945 (1bar, 20°C) =4: 1bar, 0°C (use for line result MGNM3) =5: 1.01325bar, 20°C =6: 14.696psia, 60F (often used for SCF( standard cubic feet )) =-1: Use measurement points for reference pressure and temperature =-2: Do not normalize but use actual pressure and temperature
FNORMW	Consideration of water for normalized concentration Like in Parent Profile (Sub Profile option only) Expression =0: Keep actual water concentration (wet) =1: Neglect water concentration (dry)
FNORMO2	Flag to define scaling to reference O2 concentration Like in Parent Profile (Sub Profile option only) Expression =0: Keep actual O2 concentration (no scaling) =1: Scale to molar O2 concentration from model settings =2: Scale to molar O2 concentration as specified in O2REF =3: Scale to dry molar O2 concentration from model settings =4: Scale to dry molar O2 concentration as specified in O2REF
O2REF	Reference O2 concentration (molar)
M1N	Inlet mass flow (nominal)
V1N	Specific volume at the inlet (nominal)
T1N	Flue gas temperature at the inlet (nominal)

The identification value marked in blue is the reference value for the off-design mode. The actual off-design values refer to the values used in the equations.

Characteristic Lines

Characteristic line 1: Removed fly ash ratio M3M1/M3M1N = f (M1/M1N)

     X-axis          1          M1/M1N                    1^st point
                        2          M1/M1N                     2^nd point
                        .
                      N         M1/M1N                     last point

     Y-axis        1          M3M1/M3M1N           1^st point
                        2          M3M1/M3M1N           2^ndpoint
                        .
                        N         M3M1/M3M1N           last point

Physics Used

Equations

Design case

(Simulation flag:

GLOBAL = Design case

and

FMODE = GLOBAL)

F = 1.0

ZWIP = 1.0

Off-design case

(Simulation flag:

GLOBAL = Off-design

FMODE = Local off-design)

FDUST = 0 or 1

F = (M1/M1N) ** 2*(V1/V1N)

ZWIP = f(M1/M1N) from characteristic line

FDUST = 2 or -1

F = (M1/M1N) ** 2*(V1/V1N)

ZWIP = 1-EXP(SIZCON*ACOLL/(VX(1)*DX(1)))**0.5
(Deutsch formula)

All cases

P2 = P1 DP12N * F

P3 = P2

SUM1: sum of all solid mass concentrations of line 1

DQ = QM2D*SUM1 *M1

H4 = DQ

H11 = H1+DQ/D1

T2 = f(H11,P1)

T3 = T2

H2 = f(T2,P2)

H3= f(T3,P3)

If FDUST=0 then

M3 = M3M1N*ZWIP*SUM1*M1

else if FDUST=1 then

VX2N: Specific volume in line 2 under normalized conditions

M3 = SUM1*M1-M2DV2N*ZWIP*VX2N*M2

else if FDUST=2 then

M3=ZWIP*SUM*M1

else if FDUST= -1 then

ACOLL = VX(1) * DX(1)/SIZCON*
*(LOG((DX(2)*D2DV2)/(DX(1)*SUM1)))**2.0

D2DV2 from pseudo measurement point given by IPSDUST

M3=ZWIP*SUM*M1

endif

M2 = M1-M3

Mass concentrations from mass balance of the components

Component Displays

Display Option 1

Example

Click here >> Component 85 Demo << to load an example