Røggaskondensat ved naturgasfyring i gasmotorer samt kedler

Resumé

Der er af DGC udtaget delstrømme af røggas fra i alt 5 gasmotoranlæg. Røggassen er for 4 af anlæggene ledt gennem glasflasker ved en temperatur på 3-15°C. Der er i glasflaskerne opsamlet ca. 0,5-1 liter kondensat, hvorpå analyser er udført på specialiseret laboratorium. For anlæg nummer 5, der, som det fremgår, arbejder kondenserende, er udtaget væskeprøve fra kondensatledning før og efter konditionering.

Disse analyser er sammenlignet med nævnte tidligere analyser for villa- og fjernvarmekedler.

English Abstract

Analysis of Flue Gas Condensate from Lean-Burn Gas Engines

(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.