TAMPELLA RECOVERYBOILER in Store Enso pulp mill in FINLAND

The boiler are still in good production condition despite its old year of manufacture. Boiler have had a good maintenance program throughout their operation. The boiler have been discontinued from production in 5/2023

SK 11

Tampella 1988

85 Bar

1200 t/d DS ( Original capacity 950 ton/d DS, 84 bar(G) )

480 Celsius

Boiler m3 : 98,8 m3

 

TECHNICAL SPECIFICATIONS OF RECOVERY BOILER SK 11

Boiler Design parameters

Max. continuous combustion capacity :    950 t/day

Boiler water circulation is sized for :

1300 tka/day

Pressure :  superheated steam 65 bar (abs), <amp> design pressure 35 bar (g)

Temperature

– superheated steam 480 ± 10 °C

– feed water 120 ° C

FUELS

Black liquer

– tree species : pine / other trees

dry matter content, reference point : 65 % range 61-67 %

temperature of incoming liquer : 95 ° C

heat value : 14 700 kJ/kg dry

analysis Na + K : 20%, C : 37 %, H2 : 4 %, S : 4,3 %, O2 : 34,7 %

Glauber’s salt addition

– on avarange 40 kg/ts

– in the guarantee 0

Natural gas

– effective heat value : 35,5 MJm3, pressure at the procurement limit 4,5 bar

– temperature . 5-20 °C

– density : 0,723 kg/m3

– Composition CH4 98,91 mol – %, C2H6 0, 11 mol-%, N2 0,92, CO2 0,02, o2 0,04

– total sulfur < 100 mg/m3

2.1.2 HEAT BALANCE

Dry matter content : 950 tka/24 h

Dry matter content : 65 tn

Base temperature : 0 °C

 CALCULATED OPERATING VALUES

Load

950 tka/day

Steam production

– saturated

38.6 kg/s

– superheated avg.

36.0 kg/s

Feedwater and steam temperatures

– before the economizer

120 °C

– after the economizer

250 °C

– in the cylinder

289 °C

– after the primary superheater

340 °C

– after the secondary superheater

415 °C

– after the tertiary superheater

480 °C

Combustion air

– temperature at blowers

30 °C

– primary air temperature

150 °C

– secondary air temperature

150 °C

– tertiary air temperature

30 °C

– air volume to furnace at ik = 1.05

39.6 Nm³/s

Flue gases

– flue gas volume, theoretical ik = 1.0

49.6 Nm³/s

– flue gas volume with fans

ik = 1.2

57.1 Nm³/s

– temperature after furnace

937 °C

– temperature after superheater

584 °C

– Temperature before economizer

438 °C

– Temperature after economizer

165 °C

Firebox

– Volume load

66.4 kW/m³

– Heat flux density

87 kW/m²

– Adiabatic combustion temperature 1515 °C

Boiler main dimrnsions

Firebox

Width 8,0 m

Debth 8,0 m

High primary level 18,0 m

Total height 32 m

Volume 1115 m3

Heating surface at the bottom 617 m2

Heating surface at the top 417 m2

Total heating surface 1034 m2

Fuel pipe

Heating surface in the firefox 100 m2

Heater

Primary 707 m2

secondary 846 m2

tertlary 732 m2

Total heated area 2285 m2

Roof surfaces

back wall penetration 326 m2

ricer pipes for the curtain ductwork 186 m2

coocing surface elements 1425 m2

wall elements 80 m2

Total heated area 2017 m2

Water pre-heater

water heater I 6830 m2

water heater II 6830 m2

Total headed area 13 660 m2

 

 

Please check attachements and download drawing. More information upon request