Natural gas hydrates have gained a huge attention as a potential future energy source. Reserches ... more Natural gas hydrates have gained a huge attention as a potential future energy source. Reserches and pilot operations on methane recovery from hydrate reservoirs are going on worldwide. In the present work, an artificial hydrate reservoir has been developed in lab scale using silica sand of 0.16 mm particle size, distilled water and methane gas inside a high-pressure reactor. The effectiveness of polyethylene glycol (PEG) as an inhibitor for the dissociation of natural gas hydrate has been investigated. A porous sand bed of 70% water saturation has been prepared inside a high-pressure reactor and then charged with methane gas at 8 MPa. After the hydrate formation in the porous bed, for dissociation of the hydrate reservoir, PEG aqueous solution has been injected into the hydrate reservoir using a syringe pump. The pressure of the reactor has been maintained in between the equilibrium pressure of pure methane hydrate and methane hydrate in the presence of PEG using a back-pressure regulator. The injection of PEG aqueous solution has been performed at 0.4 mass fraction for methane recovery from the artificial hydrate reservoir. PEG-200 aqueous solution has shown a methane gas production ratio of 47.38%. This work provides a practical approach to use polymer as an effective inhibitor for the production of methane from hydrate reservoir especially for low temperature and permafrost hydrate-bearing zones. This is the first work that uses an environmental friendly polymer as inhibitor for the hydrate dissociation for methane production from a natural gas hydrate. It has been observed that PEG performs well as a thermodynamic and kinetic inhibitor. In addition, PEG is having −65oC freezing point, which is more than a commercial inhibitor, ethylene glycol (-13.4oC), therefore using PEG as an inhibitor is more beneficial for the production of gas from a low-temperature hydrate reservoirs.
In the present study an attempt has been made to investigate the possibility of converting high s... more In the present study an attempt has been made to investigate the possibility of converting high sulfur North-East (NE) India coal to liquid fuels. Coal to fuel process is one of the most versatile and cleanest ways to convert coal to gasoline, naphtha, diesel and other energy forms. NE India has 935 MMT of coal reserves, out of which 467 MMT is proven reserve up to a depth of 600 m. The liquid fuels, thus produced, may help to reduce our import dependence. Low rank coal with high ash content and non coking type NE coal can be economically utilized as a feedstock for CTL Projects in India. During the CTL process there is the evolution CO2 which will increase the Green house gases (GHG). Therefore it is designed to meet the environmental challenges of CTL by capturing CO2 and injecting into the depleting oil reservoirs of Upper Assam basin for miscible Enhanced Oil Recovery (EOR) process. Keywords – CO2, Coal, CTL, DCL, Enhanced oil recovery, ICL, Liquefaction.
ABSTRACT The water forms an integral part of mankind and hence should require prime attention. Du... more ABSTRACT The water forms an integral part of mankind and hence should require prime attention. Due to industrialization and increased population, the shortage of water in several developing countries is observed. Seawater forms a huge source of potable water provided the economical desalination technology is in place. The available desalination technology, though mature, require development to make them more economical. Gas hydrates may come at help to make the process more economical. Gas hydrates are crystalline solids made of the water (host) and the gas molecules (guest) such as methane, carbon dioxide, nitrogen, etc., which are held within water cavities that are composed of hydrogen-bonded water molecules. The gas hydrate as a technology has been successful for several potential applications in various engineering fields, such as, gas separation, carbon dioxide sequestration, gas storage and transportation, energy source, refrigeration and not the least, in the desalination of salt water. The current work focuses on the use of hydrate for desalination of salt water. The desalination process is based on the phase change of liquid to solid thereby removing the solids from the liquid phase. We present a principle behind the use of hydrate technology for desalination of salt water, the science and engineering aspects of the process and future directions.
Natural gas hydrates have gained a huge attention as a potential future energy source. Reserches ... more Natural gas hydrates have gained a huge attention as a potential future energy source. Reserches and pilot operations on methane recovery from hydrate reservoirs are going on worldwide. In the present work, an artificial hydrate reservoir has been developed in lab scale using silica sand of 0.16 mm particle size, distilled water and methane gas inside a high-pressure reactor. The effectiveness of polyethylene glycol (PEG) as an inhibitor for the dissociation of natural gas hydrate has been investigated. A porous sand bed of 70% water saturation has been prepared inside a high-pressure reactor and then charged with methane gas at 8 MPa. After the hydrate formation in the porous bed, for dissociation of the hydrate reservoir, PEG aqueous solution has been injected into the hydrate reservoir using a syringe pump. The pressure of the reactor has been maintained in between the equilibrium pressure of pure methane hydrate and methane hydrate in the presence of PEG using a back-pressure regulator. The injection of PEG aqueous solution has been performed at 0.4 mass fraction for methane recovery from the artificial hydrate reservoir. PEG-200 aqueous solution has shown a methane gas production ratio of 47.38%. This work provides a practical approach to use polymer as an effective inhibitor for the production of methane from hydrate reservoir especially for low temperature and permafrost hydrate-bearing zones. This is the first work that uses an environmental friendly polymer as inhibitor for the hydrate dissociation for methane production from a natural gas hydrate. It has been observed that PEG performs well as a thermodynamic and kinetic inhibitor. In addition, PEG is having −65oC freezing point, which is more than a commercial inhibitor, ethylene glycol (-13.4oC), therefore using PEG as an inhibitor is more beneficial for the production of gas from a low-temperature hydrate reservoirs.
In the present study an attempt has been made to investigate the possibility of converting high s... more In the present study an attempt has been made to investigate the possibility of converting high sulfur North-East (NE) India coal to liquid fuels. Coal to fuel process is one of the most versatile and cleanest ways to convert coal to gasoline, naphtha, diesel and other energy forms. NE India has 935 MMT of coal reserves, out of which 467 MMT is proven reserve up to a depth of 600 m. The liquid fuels, thus produced, may help to reduce our import dependence. Low rank coal with high ash content and non coking type NE coal can be economically utilized as a feedstock for CTL Projects in India. During the CTL process there is the evolution CO2 which will increase the Green house gases (GHG). Therefore it is designed to meet the environmental challenges of CTL by capturing CO2 and injecting into the depleting oil reservoirs of Upper Assam basin for miscible Enhanced Oil Recovery (EOR) process. Keywords – CO2, Coal, CTL, DCL, Enhanced oil recovery, ICL, Liquefaction.
ABSTRACT The water forms an integral part of mankind and hence should require prime attention. Du... more ABSTRACT The water forms an integral part of mankind and hence should require prime attention. Due to industrialization and increased population, the shortage of water in several developing countries is observed. Seawater forms a huge source of potable water provided the economical desalination technology is in place. The available desalination technology, though mature, require development to make them more economical. Gas hydrates may come at help to make the process more economical. Gas hydrates are crystalline solids made of the water (host) and the gas molecules (guest) such as methane, carbon dioxide, nitrogen, etc., which are held within water cavities that are composed of hydrogen-bonded water molecules. The gas hydrate as a technology has been successful for several potential applications in various engineering fields, such as, gas separation, carbon dioxide sequestration, gas storage and transportation, energy source, refrigeration and not the least, in the desalination of salt water. The current work focuses on the use of hydrate for desalination of salt water. The desalination process is based on the phase change of liquid to solid thereby removing the solids from the liquid phase. We present a principle behind the use of hydrate technology for desalination of salt water, the science and engineering aspects of the process and future directions.
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