• Title, Summary, Keyword: Refuse Incineration Plant(소각장)

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Control of SCR System for NOx Reduction in a Refuse Incineration Plant Using Repetitive Control Method (반복제어법을 이용한 소각장 NOx 저감용 SCR 시스템의 제어)

  • 김인규;여태경;김환성;김상봉
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.11
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    • pp.2762-2770
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    • 2000
  • The refuse incineration plant has an important role in saving the combustion energy for local heating system. But harmful combustion gas(NOx etc.) leads to some serious environmental problem. To reduce the gas, a SCR(Selective Catalytic Reduction)system is installed and it is controlled by adjusting the flow of ammonia gas(NH3) . In this paper, we apply a repetitive control method to reduce NOx by adjusting the flow of ammonia gas for SCR system in a refuse incineration plant which is located in Haeundae, Pusan, Firstly, we analyze the inlet NOx period by FFt method, and verify its periodic variations. Secondly, we design a repetitive control system by using state space model method. Lastly, the effectiveness of repetitive control system is shown by comparing to a conventional PID control in simulation and experimental results.

A Study on the Inlet NOx Estimation of SCR System in a Refuse Incineration Plant by Using General Structured Observer (일반 구조형 관측기를 이용한 소각장 SCR 시스템의 Inlet NOx 추정에 관한 연구)

  • Lee, Chung-Hwan;Kim, In-Gyu;Kim, Hwan-Seong;Kim, Sang-Bong
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.1
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    • pp.123-128
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    • 2001
  • The function of SCR system in refuse incineration plant is to reduce the harmful combustion gases especially NOx which make serious environmental pollution. The SCR system normally have a NOx measurement system such as inlet NOx analyzer and outlet T.M.S.(Tele Monitoring System) to control the outlet NOx in stack. The NOx measurement system is very important, however there are frequently happened sensing problems and it need maintenance periodically. In this paper, we propose an estimation method of inlet NOx of SCR system by using general structured observer. The inlet NOx is considered as an input disturbance and it is modelled by applying FFT method in frequency domains. Through the design of general structured observer, the outlet NOx can be estimated by using observation error between real outlet NOx and estimated outlet NOx. The effectiveness of the proposed method is shown by comparing to a measured inlet NOx data.

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