Calculation of a nozzle absorber

The task of project calculation of an absorber includes determination of the geometrical sizes of a column on the set performance. We conduct calculation of an absorber for ammonia absorption process by water.

1. Calculation of an absorber the m3/h is begun with determination of amount of inert gas (air) under normal conditions,

,

in mass units of measure, kg/h

,

where, r ₀ 0 = 1,29 kg/m3 - air density under normal conditions.

2. Relative weight compositions of gas mix - on an entrance to the device

,

- on exits of an apparatus

,

Where,

М_н, М_к - molecular mass of a component (ammonia) and carrier (air), kg / k mol

3. Amount of the absorbed ammonia, kg/h

.

4. We determine the water consumption necessary for absorption of ammonia, kg/h

.

5. Concentration of ammonia in the water arriving on absorption will make (in relative weight shares)

.

6. Final concentration of ammonia in the absorbing water shares)

.

Then the equation of the working line has the following appearance

.

7. Determination of number of units of transfer in case of ammonia absorption by water is carried out by an analytical way.

According to these tab. 20 characterizing the line of balance we find value

, corresponding to final concentration of ammonia in liquid Х₁, и , corresponding to initial concentration of ammonia, i.e.Х₂.

Table 1. - Equilibrium concentration of ammonia in any differences Х

Х	0,002	0,005	0,01	0,015	0,02	0,025	0,03
	0,0009	0,0025	0,0057	0,0097	0,0147	0,0212	0,0284

The moving powers on the lowing absorber parts (on entry of gas)

.

The moving powers on the upper absorber parts (on exit of gas)

.

The moving powers to define an average arithmetical by formulas.

,

At ratio to 2 > > 0,5 must be point of the using average arithmetic significant, e.t.

.

Corresponding number of units of transfer

.

8. We determine the equivalent diameter of a nozzle, m

,

where, e - free volume of a nozzle, m³/ m³;

f - specific surface of a nozzle, m²/m³.

Не нашли, что искали? Воспользуйтесь поиском: