On-Line Batch Catalyst Technology Applied to the Stationary Sources for Total Hydrocarbon and Methane Analysis

Project Details

Description

The batch catalytic methods equipped with flame ionization detection (FID) were developed in this study to serve as continuous emission monitoring systems (CEMS) to measure volatile organic compounds (VOCs) in stack gas. CEMS is aimed at measuring the total amounts of non-methane hydrocarbons (dubbed tNMHCs) in stack gas. The method adopted packed columns and the back-flush design at isothermal oven temperature to separate methane from higher boiling VOCs. Within each analysis of 1 minutes, the concentrations of total hydrocarbons (THCs) and methane were alternatively obtained. Subsequently, the concentration of tNMHCs was obtained by subtracting the methane concentration from the THC concentration.The government has now announced the NIEA A723.73B standard method for the air pollution fee system. CEMS is accurate, stable and suitable for long-term continuous monitoring, but there are some disadvantage using this method on continuous monitoring: (1) Analysis of the column using molecular sieve , analysis of methane may cause a cross-flow or breakthrough effect, causing NMHCs to precipitate molecular sieve 5A. It causes overestimate methane concentration, and underestimate tNMHC concentration; or completely clogging molecular sieve . It causes in underestimation of methane concentration and overestimation of tNMHC concentration. (2) The role of molecular sieve in the original method should be called filter is not the analysis column, because continuous injection for a long time will cause NMHCs to accumulate on molecular sieve , but cannot be properly discharged, and once the high-boiling substance enters molecular sieve , it will cause it. There is enough time for the purification to accumulate inside the temperature (150 °C). (3) NIEA A723.73Buses two sample loops injection analysis. Although it is simultaneous sampling analysis, it may still cause errors in the calculation of non-methane hydrocarbon concentration because it is not the same sample. Therefore, this research project will develop a non-continuous pulsed injection analysis to make the THC and tNMHC concentration signals appear in a peak manner to avoid long-term exposure of the catalyst to polluting gases and greatly extend the life of the catalyst.
StatusFinished
Effective start/end date1/11/1931/10/20

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 14 - Life Below Water
  • SDG 16 - Peace, Justice and Strong Institutions
  • SDG 17 - Partnerships for the Goals

Keywords

  • Stack
  • Volatile Organic Compounds (VOCs)
  • Batch Catalytic Methods
  • pulsed analysis

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