Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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The Development of N2O Emission Factor at Municipal Solid Waste Incinerator

도시고형폐기물 소각시설의 N2O 배출계수 개발

  • 고재철 ((주)피엠알 청정기술전략연구원) ;
  • 최상현 ((주)금강씨엔티)
  • Received : 2018.12.19
  • Accepted : 2019.01.29
  • Published : 2019.03.30
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Abstract

In this study, nitrous oxide ($N_2O$) emission concentration was measured 3 times continuously for 24 hours from August 27, 2018 to October 22, 2018 and non-dispersive infrared (NDIR) spectrometer was used to calculate $N_2O$ concentration of exhaust gas from municipal solid waste (MSW) incinerator. As a result of $N_2O$ emission characteristics, it is estimated that $N_2O$ emission concentration is due to the difference of furnace temperature, oxygen concentration rather than the chemical component of waste. The measured $N_2O$ emission concentration of MSW incinerator was obtained in the range of 53.6 ~ 59.5 ppm and the total average concentration was measured 55.6 ppm. Therefore, the amount of $N_2O$ emissions calculated from the $N_2O$ concentration was $98.05kg\;day^{-1}$ on average and the amount of $N_2O$ distribution in the range of $90.41{\sim}108.44kg\;day^{-1}$ was obtained. As a result, the $N_2O$ emission factor of the MSW incinerator was estimated to be $1,066.13g_{N_2O}\;ton_{waste^{-1}}$. The estimated $N_2O$ emission factor of the MSW incinerator was 20 times higher than calculated emission factor used in the Tier 2 method. Consequently, it is considered that the method of calculating the amount of $N_2O$ emission in the MSW incineration facilities using waste type and incineration amount needs to be supplemented to ensure accuracy.

본 연구에서는 도시고형폐기물 소각시설을 대상으로 2018년 8월 27일부터 2018년 10월 22일 동안 총 3회에 걸쳐 도시고형폐기물의 소각에 의해 발생되는 $N_2O$ 농도를 24시간 동안 연속적으로 측정하여 발생량과 배출특성을 조사하였으며, 배출가스 중 $N_2O$ 농도측정은 비분산 적외선 분석기(NDIR)를 이용하였다. $N_2O$ 배출특성을 조사한 결과 도시고형폐기물 소각시설의 $N_2O$ 발생량 및 발생농도는 폐기물의 성상 보다는 소각시설의 소각로 온도와 산소농도 같은 운전조건에 따라 상이하게 발생하는 것으로 판단된다. 도시고형폐기물 소각시설의 $N_2O$ 일일평균 발생농도는 53.6 ~ 59.5 ppm이며, 전체 평균농도는 55.6 ppm으로 측정되었다. 또한 $N_2O$ 농도를 이용하여 계산된 $N_2O$ 발생량은 $90.41{\sim}108.44kg\;day^{-1}$이며, 평균 발생량은 $98.05kg\;day^{-1}$로 조사되었다. 이러한 결과를 바탕으로 도시고형폐기물 소각시설의 $N_2O$ 배출계수를 산출한 결과 $1,066.13g_{N_2O}\;ton_{waste^{-1}}$로 생활폐기물의 Tier 2 방법으로 산출된 $N_2O$ 배출계수에 비해 약 20배 정도 높은 결과를 얻었다. 따라서, 폐기물 종류와 소각량을 이용한 폐기물 소각시설의 $N_2O$ 발생량 산출방식은 정확성에 대한 보완이 필요할 것으로 판단된다.

Keywords

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Figure 1. N2O sampling schematic diagram of the municipal solid waste incinerator.

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Figure 2. Trend of actual measured N2O concentration in the object incineration.

Table 1. Equipment specification of municipal solid waste incinerator

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Table 2. N2O concentration of municipal solid waste incineration plant

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Table 3. N2O emission characteristics for waste incineration

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Table 4. Elemental compositions of municipal solid waste and sewage sludge cake

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Table 5. N2O emission factor of municipal solid waste incineration plant

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