Senin, 24 Mei 2010

Design and Test of U-Type Reverse Flow Reactor to Prevent Methane Slip


"Design and Test of U-Type Reverse Flow Reactor to Prevent Methane Slip"

Group B.0910.3.33

Ivan Hadinata Rimbualam (13007028) and Junior Setiawan (13007054)

Dr. Yogi Wibisono Budhi
Dr. Yazid Bindar


Methane is one of the greenhouse gases that has the global warming effect of 23 times higher than that of CO2. To reduce the harmness of methane, it is necessary to convert the methane into CO2. Converting methane into CO2 may reduce the global warming effect up to 87%. The typical methane emission has a low concentration (0,1–1%-v). Moreover, the methane oxidation only gives the adiabatic temperature rise about 200 – 300oC, which is not enough to activate the catalyst when the temperature of the feed gas is at ambient. Therefore, we should find another way to create an autothermal condition.

The lean methane may be oxidized in a reverse flow reactor (RFR), which may exclude the preheater. In addition, the heat produced from the reaction can be trapped as thermal energy. But on the other side, the conventional RFR can cause the methane slip, which occurs when the fresh feed inside the inert compartment is replenished by the feed gas entering the reactor from opposite direction at every switching time.

The aim of this research is to design a new RFR configuration to prevent the methane slip. Moreover, the effect of the reactor dimension and switching time on the methane conversion will be taken into consideration. This research is divided into two stages. The first stage is to design the new RFR configuration and the reactor’s dimension based on the design parameters. The second stage is to operate the new RFR to evaluate its performance and to obtain the optimum operating condition for oxidizing lean methane. The research method includes the design of RFR by considering design criteria, the experiment of methane oxidation in the RFR by varying switching time and inert length. The concentration of the feed gas and products are measured using Gas Chromatography, while the temperatures along the bed are measured using K-type thermocouple. Data interpretation to analyze the sample will be divided into analysis of reaction conversion, analysis of temperature along the bed, and analysis of the heat, generated from the RFR system.

Keywords: autothermal reaction, dynamic reactor, methane oxidation, switching time

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