Ucg t c patra india
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Ucg t c patra india Ucg t c patra india Presentation Transcript

  • T C Patra Sr RE INDIAUnderground Coal Gasification
  • …. covers • COALIFICATION PROCESS • GASIFICATION PROCESS • UNDERGROUND (IN SITU) PROCESS Underground Coal Gasification
  • • COALIFICATION PROCESS• GASIFICATION PROCESS• UNDERGROUND (IN SITU) PROCESS Underground Coal Gasification
  • COALIFICATION PROCESS COALIFICATION PROCESS IN REDUCING ENVIRONMENT Underground Coal Gasification
  • CHEMICAL COMPOSITION OF COAL Fuel C H O N Wood 49.65 6.23 43.20 0.92 Peat 55.44 6.28 35.56 1.72 Lignite 72.95 5.24 20.50 1.31Bituminous 84.24 5.55 8.69 1.52Anthracite 93.50 2.81 2.72 0.97 Clarke Underground Coal Gasification
  • CHEMICAL COMPOSITION OF COAL Rank Moisture Vol. Fixed Ash Matter Carbon Lignite 34.55 35.34 22.91 7.20 Sub- 24.28 27.63 44.84 3.25BituminousBituminous 3.24 27.13 62.52 7.11 Semi- 3.38 8.47 76.65 11.50AnthraciteAnthracite 2.80 1.16 88.21 7.85 After Moore Underground Coal Gasification
  • INDIAN COAL Underground Coal Gasification
  • Underground Coal Gasification
  • COAL PROVED RESERVES Million Tonnes_End 2001_BP statistics Underground Coal Gasification
  • COAL PROD VS. CONSUMPTION200.0 200.0180.0 Prod (Million Ton OE) 180.0 Consumption (Million Ton OE)160.0 160.0140.0 140.0120.0 120.0100.0 100.0 80.0 80.0 60.0 60.0 40.0 40.0 20.0 20.0 - - 19 81 19 82 19 83 19 84 19 85 19 86 19 87 19 88 19 89 19 90 19 91 19 92 19 93 19 94 19 95 19 96 19 97 19 98 20 99 20 00 01 19 Underground Coal Gasification
  • WORLD PRIMARY ENERGY CONSUMPTION Million Oil Natural Coal Nuclear Hydro Total tonne oil Gas Energy electricequivalentUSA 895.6 554.6 555.7 183.2 48.3 2237.3China 231.9 24.9 520.6 4.0 58.3 839.7India 97.1 23.7 173.5 4.4 16.1 314.7Russia 122.3 335.4 114.6 30.9 39.8 643.0Japan 247.2 71.1 103.0 72.7 20.4 514.5Germany 131.6 74.6 84.4 38.7 5.8 335.2WORLD 3510.6 2164.3 2255.1 601.2 594.5 9124.8 India is the 3rd largest coal consumer of the world R/P : 246 years Underground Coal Gasification
  • • COALIFICATION PROCESS• GASIFICATION PROCESS• UNDERGROUND (IN SITU) PROCESS Underground Coal Gasification
  • CARBON/COAL GASIFICATION REACTIONSPartial Combustion C + O2 = 2CO exothermicCombustion C + O2 = CO2 exothermic C + CO2 = 2CO endothermicWater-Gas C + H2O = CO + H2 endothermicHydrogasification C + 2H2 = CH4 exothermicShift CO + H2O = CO2 + H2 exothermicReformation CO + 3H2 = CH4 + H2O exothermic Underground Coal Gasification
  • MATERIAL BALANCE AIR GASIFICATION Underground Coal Gasification
  • MATERIAL BALANCE AIR GASIFICATION H2O - (153.9) C - 1000 H - 79.6 O - 230.8 N - 13.3 Underground Coal Gasification
  • MATERIAL BALANCEGASIFICATION WITH O2+H2O liq Underground Coal Gasification
  • MATERIAL BALANCEGASIFICATION WITH O2+H2O liq H2O - (153.9) C - 1000 H - 79.6 O - 230.8 N - 13.3 Underground Coal Gasification
  • MATERIAL BALANCEGASIFICATION WITH O2+H2O Steam H2Oliq 1575.1 Kg Underground Coal Gasification
  • MATERIAL BALANCEGASIFICATION WITH O2+H2O Steam H2O - (153.9) C - 1000 H - 79.6 O - 230.8 N - 13.3 Underground Coal Gasification
  • • COALIFICATION PROCESS• GASIFICATION PROCESS• UNDERGROUND (IN SITU) PROCESS Underground Coal Gasification
  • UNDERGROUND COAL GASIFICATIONA process to convertunmineable under-groundcoal/ lignite intocombustible gases bygasifying the coal insitu Underground Coal Gasification
  • ESSENTIAL STEPS IN UCG• Drill wells into coal seam• Create a permeable link path• Ignite coal at bottom• Inject air (or oxygen) to sustain fire• Remove product gas through production well• Clean product gas in surface facilities for end use Underground Coal Gasification
  • .. where we STAND.... what we SEE.... what we FACE.... what we SEEK.. Underground Coal Gasification
  • .. where we STAND.. Underground Coal Gasification
  • UCG REACTORS - WORLDSite Depth (m) Year Gas Produced (Million m3)Podmoskovna 30-80 1947-62 4700Lissichamskaya - 1948-62Angren 120-200 1962-current 14000Juzno-Abinskaja 50-300 1955-current 6700Schatska - 1965-74 *Russian Fields Underground Coal Gasification
  • UCG REACTORS - WORLDSite Depth (m) Year Gas Produced (Million m3)Hanna 85 1973-79 63.56Hoe Creek 50-120 1976-79 12.18Price Town 270 1979 1.39Rawlins 30 1979-81 17.35Centralia 75 1983 1.78Hanna ( Rocky 110 1987-88 13.10Mt.1) USA fields Underground Coal Gasification
  • UCG REACTORS - WORLDSite Depth (m) Year Gas Produced (Million m3)Bruay-en- 65 1978-81Artois (France)La aute Deule 60 1979-85(France)Thulin 860 1986-87 0.55(Belgium)Alcorisa 500-700 1990 -(Spain) European fields Underground Coal Gasification
  • .. What we SEE..Underground Coal Gasification
  • WHY UCG IN INDIA• Exploitation of huge unmineable coal reserves (123 billion tonnes) in Gujarat alone• Transportation of coal to existing power station: Severe strain on railways• Environmentally clean technology Underground Coal Gasification
  • WHY UCG IN INDIA• Use of produced gas for power generation or for chemical feed- stocks• Potential use of carbon di-oxide for Enhanced Oil Recovery (EOR) exists in the area Underground Coal Gasification
  • UCG POTENTIAL IN INDIAPOTENTIAL AREAS SOBHASAN, KALOL AND MEHSANA CITY STRUCTURE OF NORTH GUJARATESTIMATED COAL/ 123 BILLION TONNESLIGNITE RESERVES (700-1700 M DEPTH)EXPECTED ENERGY EQUIVALENT TO ABOUT 15000 BILLION M3 OF NATURAL GAS (Meh-Ahm Block) Underground Coal Gasification
  • UCG POTENTIAL GSI ONGC 234 Bt coal >350 Bt (Unmineable depth)(Around 150 Bt at 63 Bt in 60 Bt in >200 Bt inunmineable depth) Mehsana- Patan- Bengal Ahmedabad Tharad Basin Block Block Equivalent to 15000 Billion m3 of Natural Gas 10% Equivalent to 1.35 times of O+OEG reserves of ONGC Underground Coal Gasification
  • .. what we FACE.. Underground Coal Gasification
  • EXPERIENCE IN UCG PROJECTIn mid 80’s a UCG National Committee was set upto look into the UCG project wherein ONGC wasthe nodal agency• Proposed site was in Mehsana city structure• Two Information wells were drilled• Hydrological studies conducted• Core studies conducted Underground Coal Gasification
  • EXPERIENCE IN UCG PROJECT• 3-D Seismic survey carried out• Prepared Geological model• Design pilot wells Underground Coal Gasification
  • Proposed Site Underground Coal Gasification
  • GENERAL PROPERTIES FOR FAVOURABLE UCG SITE• Thickness of 3 to 10m• Steeply dipping - (Flat lying acceptable)• Strong, dry roof rock• Coal seam shall not be major aquifer• No major aquifer over coal seam at least twice of stable cavity height• Low natural permeability of formation• No major faults or fractures• Amenable topography• Proximity to end user market Underground Coal Gasification
  • UCG PILOT PROJECT IN INDIA• PILOT PROJECT SITE : MEHSANA CITY STRUCTURE• TARGET COAL SEAM : SOBHASAN - III• DEPTH OF COAL SEAM : 900-1100 M• THICKNESS OF COAL SEAM : 6-14 M• TYPE OF COAL : LOW RANK SOFT, DARK BROWN LIGNOBITUMINOUS Underground Coal Gasification
  • UCG PILOT PROJECT IN INDIAThe objectives were:• To demonstrate the feasibility of UCG at deeper depth• To demonstrate drilling of long in-seam holes and to connect hole with vertical well• To develop gasifier initiation and cavity growth control techniques• To monitor and measure gasifier development• To know product gas quality and quantity• To prove material capabilities and environmental impact Underground Coal Gasification
  • Underground Coal Gasification
  • UCG PILOT PROJECT IN INDIAThe pilot could not be executed due to• Limited expertise available then• Non-availability of OIDB funds Underground Coal Gasification
  • PHYSICAL REQUIREMENTS• Characteristics of coal/lignite seams (Chemical analysis, pyrolysis, through tube coal experiments)• Characteristics of roof and floor rocks (Mechanical properties for prediction of cavity formation and subsidence)• Hydrological studies and gas migration studies• Pollution studies (Air and Water) before and after gasification Underground Coal Gasification
  • TECHNOLOGICAL REQUIREMENTS• Drilling, Special cementing, Design and Completion of Process wells• Combustion process package ( Ignitor, Cavity formation, Propagation)• Process of CRIP (Controlled Retracting Injection Point)• Surface design for UCG Underground Coal Gasification
  • .. what we SEEK.. Underground Coal Gasification
  • Participation Required• Resource Characterisation – Coal Seam Properties – Hydrologic Characteristics• Laboratory investigations of coal properties• Laboratory Gasifier experiments• Reaction Kinetics• Subsidence studies• Detailed Engineering design of pilot• Development of process options for UCG product Gas cleanup.• Simulation of underground process …… and lot more Underground Coal Gasification
  • Underground Coal Gasification