Absorption column d 1400 - Drawings

Contents

Introduction

1. Calculation of packing absorber

1.1. Calculation of the mass of the absorbed substance and the flow rate of the absorber

1.2. Calculation of mass transfer driving force

1.3. Mass transfer coefficient

1.4. Calculation of gas velocity and absorber diameter

1.5. Calculation of sprinkling density and active nozzle surface

1.6. Calculation of mass output factors

1.7. Calculation of mass transfer surface and absorber height

1.8. Calculation of absorber hydraulic resistance

1.9. Mechanical calculation of main units and parts of absorber

Conclusion

List of used literature

Application

Application

Application

1.3. Mass transfer coefficient

Mass transfer coefficient Ky is found by the equation of additivity of phase diffusion resistances:

, (11)

where - mass recovery factors in liquid and gas phases, respectively, kg/( m2s); m is the distribution coefficient, kg/kg.

To calculate mass transfer factors, it is necessary to select the type of nozzle and calculate the flow rates in the absorber. When choosing the type of nozzle for mass exchange processes, they are guided by the following considerations:

first, specific process conditions - steam and liquid loads, differences in physical properties of the systems, presence of mechanical impurities in liquid and gas flows, phase contact surface in unit volume of the apparatus, etc.;

secondly, special requirements for the technological process - the need to provide a small pressure drop in the column, a wide range of changes in the stability of the operation, a short residence time of liquid in the apparatus, etc.;

thirdly, special requirements for hardware design - the creation of a single or mass-produced apparatus of small or large unit power, ensuring the possibility of working in a highly corrosive environment, creating conditions of increased reliability, etc.

In our case, the nozzle is defined by the conditions of the task:

Type of nozzle: Rashig rings, ceramic, ordered.

Conclusion

In this course design, the absorption process was considered and studied in order to reduce the ethanol vapor concentration from 0.80 (mol%) to 0.01 (mol%) in an inert gas (nitrogen) using water. The main apparatus of this process is a nozzle absorber with ordered ceramic Rashig rings.

As a result of the calculations, the following parameters were determined:

1) absorber diameter - 1400mm;

2) height of nozzles - 5 m.

3) mass transfer surface - 1170m2

4) column capacity - 138.90kg/h;

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