Analysis of Flue Gas Condensate from Lean-Burn Gas Engines

Jan de Wit og Malene Nielsen, June 2000, R0007

English Abstract

(The text of the report is in Danish)

The Danish Gas Technology Centre has performed a series of analytical tests of the composition of flue gas condensate from lean-burn gas engines. The results have been compared with previously reported results from boilers. The results have impact on plant design, especially considering corrosion, choice of material and wastewater treatment.

The condensate has been analysed for the following parameters: Acidity, electrical conductivity, chloride, nitrate, nitrite, ammonium, and sulphate.

The analysis results showed that the flue gas condensate was rather acidic with a pH value of around 2.8. The content of nitrate was from 60 to 86 mg/l, the sulphate content varied from 6 to 60 mg/l, and a low < 5 mg/l content of ammonia, chloride and nitrite was detected in the samples. The electrical conductivity was in the range 33-150 mS/m.

Compared to the boiler condensate, the condensate from gas engines is more acidic, has a larger content of nitrate, larger variations in the sulphate content, and about the same chloride content.