(1) Calculation of the geometry of the furnace
(1) Grate area required for each dryer:
Where S 1 ——— grate area, m 2 ;
Q YDW ———The low calorific value of coal , kJ/kg.
G 3 ———fuel coal consumption, kJ/h.
n———The number of dryers calculated according to the amount of evaporated water,
Q 8 ———The heat load per unit grate area, kJ/(m 2 · h) is generally 5～7.5×10 5 kJ/(m 2 · h).
The effective area of ​​the grate should be greater than the calculated value S 1 .
There are two types of grate: fixed type and chain type. When the fuel coal has a particle size of 0 to 3 mm and no more than 30%, and the water content is less than 16%, a fixed grate should be used. Otherwise, a chain grate should be used.
(2) Volume of the combustion chamber:
Where V 4 -- the volume of the combustion chamber, m 3 ;
Q YDW , G 3 , n——— See the corresponding symbol of formula (2).
(3) Combustion chamber height:
Where H—the height of the combustion chamber, m;
V 4 ———the volume of the combustion chamber, m 3 ;
S 1 ———Grate area, m 2 . See formula (1)
(2) Selection and calculation of blowers
(1) Air volume of the blower:
Where V 5 — the air volume of the blower, m 3 /h;
G 3 ———fuel coal consumption, kg/h.
d———The total air consumption coefficient of the combustion chamber and the mixing chamber.
L 0 — The theoretical value of the amount of air required to burn a kilogram of coal, kg/kg.
t 0 ———the temperature of the air entering the combustion chamber, °C;
Ï a ———Air density, generally 1.29kg/m 3 . [next]
(2) Wind pressure of the blower:
H 2 =H m +Σ(e k +t) (5)
Where H 2 is the wind pressure of the blower, Pa;
H M ———Grate resistance, Pa. Generally take 588.60Pa;
Σ(e k +t)—the local resistance of all pipes, generally 392.4Pa.
When using gas as fuel, the H M value is 490.5Pa, and the Σ(e k +t) value is 2.45～3.43kPa.
(3) Selection and calculation of induced draft fan
(1) Air volume of the induced draft fan:
Where V 6 ——— the amount of air induced by the induced draft fan, m 3 /h;
V 2 ———The volume of exhaust gas discharged from the dryer, m 3 /h.
n———Number of dryers, Taiwan.
(2) Wind pressure of the induced draft fan:
H 3 =H d +H c +H m +H h +H Æ’ +H p (7)
Where H 3 ———wind pressure of the induced draft fan, Pa;
H d ———The resistance of the airflow resistance of the dryer, taking 294.3～588.6Pa;
H c ———The wind resistance pressure of the cyclone, taking 490.5～588.6Pa;
H m ———The wind resistance pressure of the multi-tube dust collector, taking 490.5～735.75Pa;
H h ———The wind resistance pressure of the wet dust collector is taken as 294.3Pa;
H p ———The wind resistance pressure of the duct is 196.2～392.4Pa;
H Æ’ --- the windshield pressure of the flue baffle, take 147.15Pa;
(IV) Selection and calculation of dust collection equipment The dust collection equipment used in the drying workshop is commonly used in the following types:
Cyclone dust collectors commonly used specifications are Ñ„700, Ñ„750, Ñ„800;
The commonly used specifications for wet water film dust collectors are Ñ„800, Ñ„900, Ñ„1000 and Ñ„1200;
Where n——— the total number of tubes of the multi-tube dust collector, the root;
Q 7 ———The amount of exhaust gas processed per hour per pipe is generally 220-240 m 3 /h;
V 6 ———The air volume of the Fengfeng machine, m 3 /h. See formula (6).
(3) Wet water film dust collector:
The production capacity and the wet water film dust collector adapted to it are selected according to the exhaust gas volume V 2 discharged from the dryer.
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