Biogas upgrading through CO2 removal by chemical absorption in an amine organic solution: Physical and technical assessment, simulation and experimental validation

2020 ◽  
Vol 141 ◽  
pp. 105729
Author(s):  
Rosaria Augelletti ◽  
Stefano Galli ◽  
Paola Gislon ◽  
Maurizio Granati ◽  
Giulia Monteleone ◽  
...  
Keyword(s):  
Experimental Validation ◽  
Co2 Removal ◽  
Organic Solution ◽  
Chemical Absorption ◽  
Biogas Upgrading ◽  
Technical Assessment

Gas Turbine Combined Cycle With CO2-Capture Using Auto-Thermal Reforming of Natural Gas

2000 ◽  
Author(s):  
Thormod Andersen ◽  
Hanne M. Kvamsdal ◽  
Olav Bolland
Keyword(s):  
Natural Gas ◽  
Gas Turbine ◽  
Process Integration ◽  
Combined Cycle ◽  
Co2 Removal ◽  
Gas Turbine Combustor ◽  
Chemical Absorption ◽  
Fuel Gas ◽  
The Impact ◽  
Water Gas

A concept for capturing and sequestering CO2 from a natural gas fired combined cycle power plant is presented. The present approach is to decarbonise the fuel prior to combustion by reforming natural gas, producing a hydrogen-rich fuel. The reforming process consists of an air-blown pressurised auto-thermal reformer that produces a gas containing H2, CO and a small fraction of CH4 as combustible components. The gas is then led through a water gas shift reactor, where the equilibrium of CO and H2O is shifted towards CO2 and H2. The CO2 is then captured from the resulting gas by chemical absorption. The gas turbine of this system is then fed with a fuel gas containing approximately 50% H2. In order to achieve acceptable level of fuel-to-electricity conversion efficiency, this kind of process is attractive because of the possibility of process integration between the combined cycle and the reforming process. A comparison is made between a “standard” combined cycle and the current process with CO2-removal. This study also comprise an investigation of using a lower pressure level in the reforming section than in the gas turbine combustor and the impact of reduced steam/carbon ratio in the main reformer. The impact on gas turbine operation because of massive air bleed and the use of a hydrogen rich fuel is discussed.

A review of chemical absorption of carbon dioxide for biogas upgrading

2016 ◽  
Vol 24 (6) ◽  
pp. 693-702 ◽  
Author(s):  
Fouad R.H. Abdeen ◽  
Maizirwan Mel ◽  
Mohammed Saedi Jami ◽  
Sany Izan Ihsan ◽  
Ahmad Faris Ismail
Keyword(s):  
Carbon Dioxide ◽  
Chemical Absorption ◽  
Biogas Upgrading

scholarly journals Natural Gas Fired Combined Cycles With Low CO2 Emissions

1999 ◽  
Author(s):  
Paolo Chiesa ◽  
Stefano Consonni
Keyword(s):  
Natural Gas ◽  
Co2 Emissions ◽  
Flue Gases ◽  
Co2 Removal ◽  
Chemical Absorption ◽  
Cost Of Electricity ◽  
Fuel Prices ◽  
Combined Cycles ◽  
Reduction Of Co2 ◽  
The Cost

This paper assesses performances and economic viability of CO2 removal by chemical absorption from the flue gases of natural gas-fired Combined Cycles, more specifically for two configurations: one where CO2 is removed ahead of the stack without modifying the power cycle; the other where part of the flue gases is recirculated to the gas turbine, thereby reducing the flow to be treated by chemical absorption. In both cases sequestered CO2 is made available at conditions suitable to storage into deep oceanic waters. Performances and cost of electricity are evaluated for systems based on large, heavy-duty turbines representative of state of the art “FA” technology. Carbon sequestration reduces net plant efficiency and power output by about 10% and increases the cost of electricity from 36 to about 50 mills/kWh. Flue gas recirculation warrants slightly higher efficiencies and lower costs. CO2 removal is eventually compared with other strategies for the reduction of CO2 emissions, like switching existing coal-fired steam plants to natural gas or replacing existing steam plants with conventional CCs. At current fuel prices the latter appears the option of choice, with a cost of about 25 $ per tonn of avoided CO2 emission.

IMPROVEMENT OF BIOGAS UPGRADING PROCESS USING CHEMICAL ABSORPTION AT AMBIENT CONDITIONS

2017 ◽  
Vol 80 (1) ◽  
Author(s):  
Fouad R. H. Abdeen ◽  
Maizirwan Mel ◽  
Mohammed Saedi Jami ◽  
Sany Izan Ihsan ◽  
Ahmad Faris Ismail
Keyword(s):  
Carbon Dioxide ◽  
Gas Flow ◽  
Packed Column ◽  
Flow Ratio ◽  
Ambient Conditions ◽  
Chemical Absorption ◽  
Biogas Upgrading ◽  
Absorption Column ◽  
Column Apparatus ◽  
Gas Flow Ratio

Biogas major components are methane, carbon dioxide and traces of hydrogen sulfide, ammonia and nitrogen. Biogas upgrading process is the process by which carbon dioxide (composing 40 % of the biogas) is removed. In this study chemical absorption process using three different solvents (10 – 30 % monoethanolamine, 4 – 12 % sodium hydroxide and 5 – 15 % aqueous ammonia) was performed to produce methane-enriched biogas. A laboratory-scale packed-column apparatus containing efficient and cheap packing material (plastic bioball) was used to perform the experimental work in this study. Initial absorption runs were performed to select the best solvent type and concentration. Monoethanolamine (MEA) was proven to have the highest ability in producing upgraded biogas using a single absorption column apparatus at ambient conditions. The liquid to gas flow ratio was investigated using 30 % MEA solution. Optimum liquid to gas flow ratio for biogas upgrading process was determined to be about 18 (on mass basis). Biogas with methane content up to 96.1 v/v% was produced with CO2 loading capacity up to 0.24 mole-CO2 per mole-MEA.

scholarly journals Purification of biohydrogen from fermentation gas mixture using two-stage chemical absorption

2019 ◽  
Vol 90 ◽  
pp. 01012 ◽  
Author(s):  
Abdul Mum Nor Azira ◽  
Asli Umi Aisah
Keyword(s):  
Experimental Study ◽  
Hydrogen Gas ◽  
Wire Mesh ◽  
Biohydrogen Production ◽  
Future Application ◽  
Gas Mixture ◽  
Co2 Removal ◽  
Chemical Absorption ◽  
Two Stage ◽  
Second Stage

Research on biohydrogen production via fermentation process has shown a tremendous progress for the past few years. As biohydrogen production is being established, the purification of biohydrogen should consider the process flow for future application. This paper presents an experimental study of biohydrogen purification using two-stage chemical absorption. The research work focuses on carbon dioxide (CO2) removal, which is a major unwanted fermentation gas product via activated methyldiethanolamine (MDEA) and caustic (NaOH) in two-stage chemical absorption. The experiment was conducted at low pressure of 1 bar and normal room temperature of 29 °C using a ratio of 1:1 of CO2:H2 standard gas mixture as the feed. In the first stage, 40 wt. % MDEA was activated by using piperazine (PZ) with the concentration between 2 and 10 wt. %, whereas 20 wt. % NaOH was used in the second stage. It was found that 6 wt. % of PZ was required to fully activate 40 wt. % MDEA, which resulted in 79% CO2 removal. To improve CO2 removal, a gas distributor and wire mesh packed were used to create gas bubbles at higher geometrical surface. The experimental study successfully removed 99.59% of the total CO2, producing >99 mol% hydrogen gas purity from the second stage that used 20 wt. % NaOH.

scholarly journals Biogas upgrading by chemical absorption using ammonia rich absorbents derived from wastewater

2014 ◽  
Vol 67 ◽  
pp. 175-186 ◽  
Author(s):  
Andrew McLeod ◽  
Bruce Jefferson ◽  
Ewan J. McAdam
Keyword(s):  
Chemical Absorption ◽  
Biogas Upgrading

scholarly journals Chemical Absorption of CO2 Enhanced by Nanoparticles Using a Membrane Contactor: Modeling and Simulation

Membranes ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 150 ◽  
Author(s):  
Nayef Ghasem
Keyword(s):  
Liquid Flow Rate ◽  
Hollow Fiber Membrane ◽  
Removal Rate ◽  
Membrane Resistance ◽  
Separation Performance ◽  
Co2 Removal ◽  
Membrane Contactor ◽  
Chemical Absorption ◽  
Membrane Pores ◽  
Total Membrane

In the present work, membrane resistance was estimated and analyzed, and the results showed that total membrane resistance increased sharply when membrane pores were wetted. For further study, a two-dimensional (2D) mathematical model was developed to predict the chemical absorption of CO2 in aqueous methyldiethanolamine (MDEA)-based carbon nanotubes (CNTs) in a hollow fiber membrane (HFM) contactor. The membrane was divided into wet and dry regions, and equations were developed and solved using finite element method in COSMOL. The results revealed that the existence of solid nanoparticles enhanced CO2 removal rate. The variables with more significant influence were liquid flow rate and concentration of nanoparticles. Furthermore, there was a good match between experimental and modeling results, with the modeling estimates almost coinciding with experimental data. Solvent enhanced by solid nanoparticles significantly improved the separation performance of the membrane contactor. There was around 20% increase in CO2 removal when 0.5 wt% CNT was added to 5 wt% aqueous MDEA.

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