Presentation is loading. Please wait.

Presentation is loading. Please wait.

Utilization of Landfill Gas towards High-BTU Methane and Low-Cost Hydrogen Fuel by Manolis M. Tomadakis and Howell H. Heck Florida Institute of Technology.

Similar presentations


Presentation on theme: "Utilization of Landfill Gas towards High-BTU Methane and Low-Cost Hydrogen Fuel by Manolis M. Tomadakis and Howell H. Heck Florida Institute of Technology."— Presentation transcript:

1 Utilization of Landfill Gas towards High-BTU Methane and Low-Cost Hydrogen Fuel by Manolis M. Tomadakis and Howell H. Heck Florida Institute of Technology Melbourne, FL 32901

2 Outline ã Rationale ã Objectives ã Methodology ã Preliminary Results ã Anticipated Benefits

3 Rationale ã H 2 S is among the components of landfill gas, which contains primarily CO 2 and CH 4 ã Photolytic decomposition of H 2 S provides an alternative source of hydrogen fuel ã Removal of H 2 S from landfill gas would help prevent odors, hazards and corrosion ã Removal of CO 2 would increase the BTU value of the remaining methane gas

4 Objectives 1. Test the efficiency of molecular sieves 4A, 5A, 13X in separating landfill gas towards high-BTU methane and FSEC- quality H 2 S (>50% H 2 S and <1% CO 2 ) by Pressure Swing Adsorption (PSA) 2. Investigate the effect of the landfill gas H 2 S content on the PSA process efficiency, by varying the H 2 S feed volume fraction in the range 0-1 %

5 Objectives (cont’d) 3. Determine the effect of pressure on CH 4 and H 2 S product recovery and purity, by varying the system high pressure in the range psig. 4. Examine the effect of near-equilibrium operation of the PSA process on the percent utilized sieve capacity and overall process efficiency, by varying the gas feed flowrate.

6 Pressure Swing Adsorption System Layout

7 Pressure Swing Adsorption Apparatus

8 Experimental Methodology Column I 1.Pressurization to the desired adsorption pressure by pure CH 4 2. Adsorption - supplying a mixture of CH 4, CO 2 and H 2 S 3. Blowdown to the initial pressure (~1 atm) 4. Desorption - purging with inert N 2 at nearly atmospheric pressure

9 Experimental Methodology Column II 1. Pressurization to the selected adsorption pressure by the adsorption product of column I or a directly supplied mixture of CO 2 /H 2 S 2. Adsorption at the desired high pressure 3. Blowdown to the initial pressure 4. Desorption by purging with inert N 2 at nearly atmospheric pressure

10 Preliminary Testing 1. Molecular Sieves 13X and 4A were packed in Columns I and II, respectively 2. A mixture of CH 4 -CO 2 -H 2 S was supplied to Bed I to separate CH 4 3. A mixture of CO 2 -H 2 S was supplied to Bed II to separate CO 2 and recover H 2 S 4. Adsorption and desorption in Beds I & II were carried out at 100 psig & 0 psig, respectively

11 Preliminary Experiments

12 Ratio of Outlet to Inlet Molar Flow during Adsorption

13 Ratio of Inlet to Outlet Molar Flow during Desorption

14 Gas Product Composition in Bed I during Adsorption

15 Gas Product Composition in Bed I during Desorption

16 Gas Product Composition in Bed II during Adsorption

17 Gas Product Composition in Bed II during Desorption

18 H 2 S/CO 2 Molar Ratio in Bed II Desorption Product

19 Sieve Capacity & Utilization 1. Column I adsorption loads: 0.9 kg CH 4, 2.4 kg CO 2, & 2 kg H 2 S/100 kg 13X Column I sieve equilibrium capacities: 23 kg CO 2 or 19 kg H 2 S per 100 kg 13X 2. Column II adsorption loads: 2.8 kg CO 2 and 1.9 kg H 2 S per 100 kg 4A Column II sieve equilibrium capacities: 18 kg CO 2 or 14 kg H 2 S per 100 kg 4A

20 Summary of Preliminary Results 1. A 50% CH 4 feed over 13X ZMS resulted to 98%-99% product CH 4 during adsorption 2. A 68% CO % H 2 S feed over 4A ZMS resulted to 71% H 2 S and 29% CO 2 product during desorption 3.A 20-30% utilization of equilibrium sieve capacity was encountered

21 Expected Technical Results of Proposed Study Variation of the PSA product purity and recovery (CH 4 %, H 2 S%, CO 2 %) and utilized % sieve capacity with: a) Type of utilized molecular sieve (4A, 5A, 13X) b) H 2 S content of landfill gas (0-1%) c) Maximum applied pressure ( psig) d) Landfill gas feed flowrate

22 Anticipated Benefits Development of environmentally acceptable & financially sound end use for landfill gas, providing both a high-BTU CH 4 stream and a low-cost H 2 S feed stream supply for the FSEC renewable hydrogen fuel program


Download ppt "Utilization of Landfill Gas towards High-BTU Methane and Low-Cost Hydrogen Fuel by Manolis M. Tomadakis and Howell H. Heck Florida Institute of Technology."

Similar presentations


Ads by Google