Thermal calculation (3)

(14) Flue gas entering the dryer:

Where ι ₂ ———the total amount of flue gas, kg/h;
ρ ₁ ——— total flue gas density, kg/m ³ ;
ρ _G ———the density of flue gas under standard conditions, kg/h; ρ _G value generally takes 1.34;
V ₁ ———the total volume of flue gas, m ³ /h;
ι ₀ ———The amount of dry flue gas produced by burning one kilogram of coal . See formula (8)
g ₃ ———The amount of water vapor entering the dry explosion machine at the same time as the flue gas, kg/kg. See formula (10)
t ₁ ———the temperature of the flue gas entering the dryer, °C;
ι ₁ ——— Dryer flue gas required per hour, kg/h. See formula (15).
(15) Fuel coal consumption:

Where G ₃ ———fuel coal consumption (not considering 10% incomplete combustion loss), kg/h;
ι ₁ ———The amount of dry flue gas required per hour for the dryer, kg/h. See formula (15)
ι ₀ ———The amount of thousand flue gas produced by burning one kilogram of coal, kg/kg. See formula (8)
(16) The calorie consumption of vaporized water can be calculated by the amount of flue gas and heat content required to vaporize one kilogram of water:
q=ι(I ₁ -I ₀ ) (20)
Where q———heat consumption of one kilogram of water vaporized, kJ/kg;
ι———Thousand flue gas volume required for evaporating water, kg/kg, see formula (14);
I ₀ ———the air heat content when the temperature is t _{0 and the} humidity is Ñ„ ₀ , kJ/kg dry air;
I ₁ ———The heat content of the flue gas entering the dryer, kJ/kg. See equation (12). [next]
(17) Exhaust gas from the dryer:

Where ι ₃ ———the weight of the exhaust gas discharged from the dryer, kg/h;
V ₂ ——— volume of exhaust gas discharged from the dryer, m3/h;
Ρ ₂ ——— the density of exhaust gas at a temperature of t ₂ ;

p ₀ ———pressure, Pa, generally take 99325Pa
t ₂ ———Exhaust gas temperature, °C;
W———the amount of vaporized water in the drying process, kg/h. See formula (1);
ι ₂ ——— Total amount of flue gas entering the dryer per hour, kg/h. See formula (16);
d ₂ ———The moisture content of the exhaust gas from the dryer, kg/kg.
(18) The volume of the final exhaust gas discharged by the induced draft fan:
V _m =1.2V ₂ (23)
Where V _m — the volume of the final exhaust gas, m ³ /h;
1.2———the reserve coefficient;
V ₂ ———The volume of exhaust gas from the dryer, m ³ /h.[next]
B Using gas as fuel (1) The amount of vaporized water in the drying process is calculated according to formula (1).
(2) The calorific value of burning one kilogram of gas:
Q _YDW =[22.4(5.32CH ₄ +5.07C ₂ H ₄ +5.05C ₂ H ₆ +4.91C ₃ H ₆ +4.84C ₃ H ₈ +4.94C ₄ H ₈
+4.87C ₄ H ₁₀ +4.83C ₅ H ₁₂ +1.08CO+12.75H ₂ +1.6H ₂ S+4.9C _x H _y )]×4.1868 (24)

Where Q _YDW ——— low calorific value of gas, kJ/kg;
Q _YGW ———High calorific value of gas, kJ/kg;
CH ₄ ... H ₂ S———weight percent of each component of the gas, %;
x, y—the number of hydrocarbon atoms in the hydrocarbons of the x and y gas components in C _x and H _y . The x and y in C _x H _y without the subdivided components take the average of the components.
(3) Theoretical value of the amount of air required to burn one kilogram of gas:

Where L ₀ ———the weight of the theoretical air amount, kg/kg;
O ₂ ———% of oxygen in the gas, %;
CO, H ₂ , H ₂ S—the content of carbon monoxide, hydrogen and hydrogen sulfide in the gas, %;
x, y——— See the corresponding symbol of formula (25).

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