Verbundforschungsprojekt ADECOS

Wet Flue Gas Desulphurisation Test Facility

Short description

Wet Flue Gas Desulphurisation Test Facility at TU Dresden

Gas scrubber test facility for real flue gas at downstream side of pulverized coal firing.
In connection with the Pulverised Fuel Combustion Test Facility, therefore a direct comparison for the desulphurisation behaviour in air or 'oxyfuel' mode.
Scrubber operation as spray absorber respectively bulk or package absorber possible.
The scrubber operates in double-flow as well as in double-row configuration (double-loop FGD).
Good extraction possibilities in all ranges and inspection glasses at revealing positions.
The reaction step for oxidation (and forming gipsum) can be realised with internal or external oxidation.
Cooling/ heating and agitation of the absorbate in absorber bottom and external oxidation possible.
Flue gas transport by outlet-sided ventilator; absorbent transport by compressed air membrane pumps.
The cylindric absorption column consists of single modules with flange connections for easy modification of the height of absorption.

Plant components
1: Crude gas inlet	6: Inspection glass
2: Clean gas outlet	7: Ventilator
3: Spray absorber	8: Agitator
4: Bulk or package absorber	9: Compressed air membrane pump
5: Absorber bottom tank	10: Electric control cabinet

Datasheet

Raw gas volume flow:	30 Nm³/h
Operating temperature:	till 80 °C
Feed rate per absorption column:	800 l/h per absorption column
Dimensions:	Inner diameter of the absorption column: 125 mm Height of the absorption column: 2 m / 3.5 m
Material:	PP-H
Capacity of the absorber tank:	2x 140 l (absorber bottom tank) 400 l (external oxidation tank)

Operation and measurements

System control

The compressed air membrane pumps, agitator, ventilator as well as the lighting could be switched on or off by the electric control cabinet. The feed rate of the compressed air membrane pumps are controlled manually by flow-control valves.

Possibilities of analyzing, measurement data logging and data interpretation in the lab

The following determining factors for absorption by wet FGD can be analyzed with the test rig:

L/G-ratio (liquid to gas)
pH-value of the absorbent in the absorber tank
pH-value of the absorbent
Concentration of the absorptive
Velocity of the flue gas
Solid mass fraction in the absorber tank
Solid mass fraction in the absorbent
Use of additives

The test facility features temperature gauges at the inlet and outlet connection, in the absorber tank, in the external oxidation as well as in the heating and cooling circuit.
Furthermore gas volume flow at outlet-side as well as the relative humidity and the composition of the gas in front of and after every absorption column can be determined.
For the analysis of the absorbate there are pH- and redox-probes available in the absorber tanks and the external oxidation. Samples of absorbate and absorbent, flue gas condensate as well as flue gas can be analyzed regarding to their composition and degree of purity in the lab.