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Comparison of ammonia method and calcium method





1. design(ed) value

boiler duty:320t/h

Boiler quantity:1set

flue gas volume:600000m3/h

Flue gas inlet temperature:140℃

Inlet SO2 concentration in flue gas:2000mg/Nm3

SO2 emission concentration of net flue gas at outlet:<35mg/Nm3

Export dust content: <5mg/Nm3

sulphur removal efficiency>99%

2.Index consumption

Removal of SO2: 779.34kg/h, 6234.71t/a

Waste ammonia water(10%): 4.27t/h, 34160t/a

By-product ammonium sulfate: 1623.62kg/h, 12988.98t/a

water deprivation : 13.6m3/h, 108800m3/a

power consumption: 740kw/h 592ten thousandkw·h /a

3.Unit cost

Including: raw and auxiliary materials costs, power fuel costs, personnel wages, maintenance costs, the following price calculation:

Waste ammonia water(10%): 100yuan/ton

fresh water (FW) : 2yuan/ton

electrovalence: 0.5yuan/kWh

staff wages: 40000yuan/year

ammonium sulphate: 500yuan/ton


Comparison of ammonia method and calcium method in magnesium consumption

ammonia absorption process

Calcium absorption process

magnesium reduction process

Unit cost

Waste ammonia water(10%):100yuan/ton
fresh water (FW) : 2yuan/ton
electrovalence: 0.5yuan/kWh
staff wages: 40000yuan/year
ammonium sulphate: 400yuan/ton

CaO(80%): 350元/噸
fresh water (FW) : 2yuan/ton
electrovalence: 0.5yuan/kWh
staff wages: 40000yuan/tyear
gyp: 5yuan/ton

MgO (78%): 700元/噸
fresh water (FW) : 2yuan/ton
electrovalence: 0.5yuan/kWh
staff wages: 40000yuan/year
magnesium sulfate: 100yuan/ton

economic indicator consume

Removal of SO2: 6234.71t/a
Waste ammonia water(10%):34160t/a
By-product ammonium sulfate: 12988.98t/a
water deprivation 108800m3/a
power consumption: 592ten thousand kw·h /a

Removal of SO2: 6234.17t/a
CaO(80%): 7023.18t/a
By-product gypsum: 20176.63t/a
water deprivation 128000m3/a
power consumption: 1179.4ten thousand kw·h /a

Removal of SO2: 6234.17t/a
MgO (78%): 5145.19t/a
By-product seven water Magnesium Sulfate:23962.6t/a
water deprivation 121073m3/a
power consumption: 852.6ten thousand kw·h /a


 

ammonia desulfurization

Calcium desulphurization

Desulfurization by Magnesium Oxide process

project

specifications

unit

Annual consumption

Cost / million yuan

specifications

unit

Annual consumption

Cost / million yuan

specifications

unit


Annual consumption

Cost / million yuan

desulfurizer

10%

100yuan/t

34160

341.6

80%

350yuan/t

7023.18

245.8

78%

700yuan/t

5145.19

360.16

water

 

2yuan/t

108800

21.76

 

2yuant

128000

25.6

 

2yuan/t

121073

24.2

electricity

 

0.5yuan/kWh

5920000

296

 

0.5yuan/kWh

1179.4

589.7

 

0.5yuan/kWh

852.6

426.3

wages for workmen

 

40000.person·year

8

32

 

40000.person·year

8

32

 

40000.person·year

8

32

unkeep

 

million

20

 

million

 

25

 

million

 

25

Direct operating cost subtotal

 

million

711.36

 

million

 

918.1

 

million

 

867.66

by-product

 

400yuan/T

12988.98

519.559

 

5yuan/T

20176.63

10.09

 

100yuan/T

23962.6

239.6

Annual comprehensive desulfurization cost deducted from sales income

 

million

191.801

 

million

 

908.01

 

million

 

628.06