EP0061111B1 - Verfahren zur Untertagevergasung fester Brennstoffe - Google Patents

Verfahren zur Untertagevergasung fester Brennstoffe Download PDF

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Publication number
EP0061111B1
EP0061111B1 EP82102053A EP82102053A EP0061111B1 EP 0061111 B1 EP0061111 B1 EP 0061111B1 EP 82102053 A EP82102053 A EP 82102053A EP 82102053 A EP82102053 A EP 82102053A EP 0061111 B1 EP0061111 B1 EP 0061111B1
Authority
EP
European Patent Office
Prior art keywords
fuel
temperature
supercritical
gas
process according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82102053A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0061111A3 (en
EP0061111A2 (de
Inventor
Hubert Dr. Coenen
Ernst Dr. Kriegel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fried Krupp AG
Original Assignee
Fried Krupp AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fried Krupp AG filed Critical Fried Krupp AG
Publication of EP0061111A2 publication Critical patent/EP0061111A2/de
Publication of EP0061111A3 publication Critical patent/EP0061111A3/de
Application granted granted Critical
Publication of EP0061111B1 publication Critical patent/EP0061111B1/de
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/164—Injecting CO2 or carbonated water
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
    • E21B43/168—Injecting a gaseous medium
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/18—Repressuring or vacuum methods
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E21B43/243—Combustion in situ

Definitions

  • the invention relates to a method for underground gasification of solid fuels, in which the fuel stored below the surface of the earth is first digested and then converted into a gaseous fuel by a chemical reaction with a gasifying agent.
  • the gas generated during underground gasification has a calorific value of approx. 1350 kcal / Nm 3 when 60% oxygen and 40% water vapor are used as the gasifying agent.
  • This gas is extracted from the fuel store via the boreholes and can be used as heating gas or - after appropriate pretreatment - as synthesis gas.
  • the known digestion processes have the disadvantage that in particular the volatile organic components present in the solid fuels are not removed. This leads to the fact that during the actual underground gasification, the volatile constituents are expelled from the gasified storage section and the gas-permeable pores and cracks present in the adjacent storage section stick together. In addition, the water present in the solid fuel is not removed by the known digestion processes, which means that the calorific value of the gas generated by underground gasification is reduced accordingly.
  • the invention has for its object to provide a method for underground gasification of solid fuels, in which the volatile constituents contained in the solid fuel can be obtained and which provides a gas with a high calorific value.
  • the steerability and economy of underground gasification should be improved with the invention.
  • the object underlying the invention is achieved in that the fuel is digested by treatment with a gas in the supercritical state during the day, the volatile organic compounds contained in the fuel and water dissolving in the supercritical gas, and that from the loaded supercritical gas phase the organic compounds dissolved in it and the dissolved water are separated in at least two fractions by reducing the pressure and / or changing the temperature during the day.
  • DE-B-1 493 190 discloses a process for separating organic substance mixtures by treating the mixtures with a supercritical gas and then separating the substances dissolved in the supercritical gas phase by lowering the pressure and / or increasing the temperature;
  • supercritical gases in the underground gasification of solid fuels as disintegrants, since it could not be expected that the volatile organic compounds in particular could advantageously be extracted from the solid fuel during the day and recovered during the day.
  • extracting the volatile components is prevented that they stick the gas-permeable pores of the fuel in the gasification process and thus adversely affect the gas permeability of the fuel.
  • the water present in the fuel is largely absorbed by the supercritical gas, as a result of which the calorific value of the gas generated during underground gasification increases accordingly.
  • the fractional separation of the gaseous and liquid organic compounds extracted from the fuel and of the water provided by the invention advantageously enables raw materials, in particular aromatic hydrocarbons, to be obtained.
  • the separation of the dissolved substances can be carried out according to the invention solely by lowering the pressure or solely by changing the temperature (increasing or decreasing the temperature) or by simultaneously reducing the pressure and changing the temperature (increasing or decreasing the temperature).
  • the gas in the supercritical state has a temperature of 10 to 100 ° C. above its critical temperature and a pressure of 2 to 300 bar above its critical pressure when it enters the fuel store.
  • These condition conditions ensure that the gas on the one hand maintains its supercritical state in the fuel store and on the other hand is introduced into the fuel store with an economically justifiable expenditure of energy.
  • the temperature of the supercritical gas on its extraction path decreases during the day so that it has a temperature which is 5 to 15 ° C. above its critical temperature when it exits the fuel store.
  • the temperature gradient of the supercritical gas provided according to the invention during the day thus prevents extracted substances from precipitating out of the fuel store before the supercritical gas phase emerges and the gas-permeable pores of the fuel sticking together.
  • the invention also proposes that the entry temperature of the supercritical gas into the fuel store be reduced by 2 to 50 ° C during the digestion.
  • the extraction capacity of the supercritical gas is continuously increased during the digestion of the fuel store, and the reduction in the extraction speed, which is caused by the decrease in the amount of substance to be extracted during the digestion, can be compensated for by increasing the dissolving capacity of the supercritical gas. Because the entry temperature of the supercritical gas into the fuel store is reduced during the digestion and the exit temperature of the supercritical gas from the fuel store is only slightly above the critical temperature of the gas, the zone within which the supercritical gas has a maximum extraction effect migrates into advantageously opposite to the flow direction of the supercritical gas.
  • the process according to the invention can be carried out with particularly good success if C0 2 is used for the digestion of the fuel, since supercritical C0 2 has a sufficiently good solvent capacity both for water and for the organic compounds contained in the solid fuel and can be used without expensive safety precautions .
  • ethane, ethene, propane or mixtures of these gases are used for the digestion of the fuel. When using this procedural measure according to the invention, however, care must be taken to avoid security risks.
  • Coal deposits are particularly suitable for underground gasification, for which mining does not seem worthwhile and which in particular contain no water-bearing layers.
  • the method can also be used for oil shale and oil sands deposits if the geological conditions allow it.
  • a prerequisite for the applicability of the method according to the invention is a dense deposit from which the loaded supercritical gas phase can be almost completely recovered.
  • Two vertical boreholes 2a, 2b are drilled in such a coal deposit 1. about the borehole 2a that used in the exclusion of supercritical C0 2 is conveyed into the coal deposits.
  • the supercritical C0 2 can also supercritical propane, ethane. Ethene or mixtures of these gaseous hydrocarbons are used, but it must be ensured that the use of these gases does not pose any safety risks.
  • the supercritical C0 2 has a temperature of approx. 60 ° and a pressure of approx. 300 bar when it enters the fuel store.
  • the supercritical C0 2 diffuses through the coal store and is loaded with volatile organic compounds and water.
  • the water content of the coal is on average around 1% by weight, and this water is usually absorbed by the supercritical gas phase, since it is loaded with water until it is saturated.
  • the water from highly water-containing or water-bearing fuel layers is only partially extracted from the supercritical gas phase. The further the digestion of the coal pre-standard progresses, the more diffusion channels are created, so that a high permeability of the coal deposit for gases is achieved.
  • Supercritical gas phase 4 emerges at borehole 2b and is separated into its components. The ratio of supercritical gas quantity to digested coal quantity is between 1: 3 and 1:10.
  • the dissolved organic compounds are converted from the supercritical C0 2 according to their. Molecular weight and the dissolved water deposited in a known manner by lowering the pressure and / or changing the temperature.
  • the regenerated digestion means 6 is compressed in the pump 7 to the supercritical pressure required for the digestion of the fuel and heated in the heat exchanger 8 to the required supercritical temperature. It then arrives in borehole 2a in the supercritical state. Since a certain amount of disintegrant is lost during the digestion, new gas - in the present case C0 2 - is continuously fed into the circuit from the storage tank 9.

Landscapes

  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing Of Solid Wastes (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Industrial Gases (AREA)
EP82102053A 1981-03-21 1982-03-13 Verfahren zur Untertagevergasung fester Brennstoffe Expired EP0061111B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3111137 1981-03-21
DE3111137A DE3111137C2 (de) 1981-03-21 1981-03-21 Verfahren zur Untertagevergasung fester Brennstoffe mit vorangehendem Aufschließen der Lagerstätte

Publications (3)

Publication Number Publication Date
EP0061111A2 EP0061111A2 (de) 1982-09-29
EP0061111A3 EP0061111A3 (en) 1984-07-18
EP0061111B1 true EP0061111B1 (de) 1987-05-20

Family

ID=6127924

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82102053A Expired EP0061111B1 (de) 1981-03-21 1982-03-13 Verfahren zur Untertagevergasung fester Brennstoffe

Country Status (10)

Country Link
US (1) US4446921A (cs)
EP (1) EP0061111B1 (cs)
JP (1) JPS57168991A (cs)
AU (1) AU552221B2 (cs)
CA (1) CA1170977A (cs)
CS (1) CS247065B2 (cs)
DD (1) DD202447A5 (cs)
DE (1) DE3111137C2 (cs)
PL (1) PL133246B1 (cs)
ZA (1) ZA821848B (cs)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3132755C2 (de) * 1981-08-19 1983-12-08 Fried. Krupp Gmbh, 4300 Essen "Verfahren zur Gewinnung von Erdöl"
US4883122A (en) * 1988-09-27 1989-11-28 Amoco Corporation Method of coalbed methane production
DE4333082A1 (de) * 1992-10-10 1994-04-14 Heinz Hinterholzinger Verfahren zur Gewinnung von Heizgas aus Müll und aufgelassenen Kohleminen
US5388641A (en) * 1993-11-03 1995-02-14 Amoco Corporation Method for reducing the inert gas fraction in methane-containing gaseous mixtures obtained from underground formations
US5388640A (en) * 1993-11-03 1995-02-14 Amoco Corporation Method for producing methane-containing gaseous mixtures
US5388642A (en) * 1993-11-03 1995-02-14 Amoco Corporation Coalbed methane recovery using membrane separation of oxygen from air
US5388645A (en) * 1993-11-03 1995-02-14 Amoco Corporation Method for producing methane-containing gaseous mixtures
US5388643A (en) * 1993-11-03 1995-02-14 Amoco Corporation Coalbed methane recovery using pressure swing adsorption separation
US5566755A (en) * 1993-11-03 1996-10-22 Amoco Corporation Method for recovering methane from a solid carbonaceous subterranean formation
US5417286A (en) * 1993-12-29 1995-05-23 Amoco Corporation Method for enhancing the recovery of methane from a solid carbonaceous subterranean formation
US5419396A (en) * 1993-12-29 1995-05-30 Amoco Corporation Method for stimulating a coal seam to enhance the recovery of methane from the coal seam
US5439054A (en) * 1994-04-01 1995-08-08 Amoco Corporation Method for treating a mixture of gaseous fluids within a solid carbonaceous subterranean formation
EP1595786A2 (en) * 2003-01-24 2005-11-16 Consejo Superior de Investigaciones Cientificas Method of immobilising hydrocarbons inside submerged containers or of transporting said hydrocarbon to the surface, using the properties of supercritical fluids at a great depth
US8262866B2 (en) * 2009-04-09 2012-09-11 General Synfuels International, Inc. Apparatus for the recovery of hydrocarbonaceous and additional products from oil shale and sands via multi-stage condensation
GB0912255D0 (en) * 2009-07-14 2009-08-26 Statoilhydro Asa Process
DE102012011145B4 (de) * 2012-06-05 2015-11-19 Technische Universität Bergakademie Freiberg CO2-basiertes In-situ-Laugungs- und Aufbereitungsverfahren für den Fluidbergbau
AU2014409227B2 (en) * 2014-10-20 2017-01-12 Sbb66 Co., Ltd System for and Method of Manufacturing Reduced Iron
US10787610B2 (en) * 2017-04-11 2020-09-29 Terrapower, Llc Flexible pyrolysis system and method
CN107246255B (zh) * 2017-07-26 2019-03-26 太原理工大学 超临界co2与水力压裂复合致裂煤体的模拟装置及方法
CN118958937B (zh) * 2024-08-07 2025-04-15 中国地质大学（武汉） 一种利用超临界二氧化碳进行碳酸盐岩酸化增储的方法和系统

Family Cites Families (20)

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US2355167A (en) * 1940-10-26 1944-08-08 Kellogg M W Co Process for the recovery of hydrocarbons
GB669216A (en) * 1948-12-09 1952-03-26 Oil Recovery Corp Improved method for the secondary recovery of oil
GB681720A (en) * 1949-11-07 1952-10-29 Cyril Aubyn Masterman Improvements in or relating to the underground gasification of coal
US2906337A (en) * 1957-08-16 1959-09-29 Pure Oil Co Method of recovering bitumen
US2974937A (en) * 1958-11-03 1961-03-14 Jersey Prod Res Co Petroleum recovery from carbonaceous formations
US3241611A (en) * 1963-04-10 1966-03-22 Equity Oil Company Recovery of petroleum products from oil shale
DE1493190C3 (de) * 1963-04-16 1980-10-16 Studiengesellschaft Kohle Mbh, 4330 Muelheim Verfahren zur Trennung von Stoffgemischen
US3358756A (en) * 1965-03-12 1967-12-19 Shell Oil Co Method for in situ recovery of solid or semi-solid petroleum deposits
US3351132A (en) * 1965-07-16 1967-11-07 Equity Oil Company Post-primary thermal method of recovering oil from oil wells and the like
GB1122091A (en) * 1966-01-06 1968-07-31 Equity Oil Company Recovery of petroleum products from oil shale
DE1245290B (de) * 1966-01-19 1967-07-27 Equity Oil Company Verfahren zur Gewinnung von Erdoel aus OElschiefer
US3474863A (en) * 1967-07-28 1969-10-28 Shell Oil Co Shale oil extraction process
US3480082A (en) * 1967-09-25 1969-11-25 Continental Oil Co In situ retorting of oil shale using co2 as heat carrier
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US4299285A (en) * 1980-07-21 1981-11-10 Gulf Research & Development Company Underground gasification of bituminous coal

Also Published As

Publication number Publication date
EP0061111A3 (en) 1984-07-18
US4446921A (en) 1984-05-08
DD202447A5 (de) 1983-09-14
CS247065B2 (en) 1986-11-13
DE3111137A1 (de) 1982-10-28
JPS57168991A (en) 1982-10-18
PL133246B1 (en) 1985-05-31
AU8075282A (en) 1982-09-30
PL235517A1 (cs) 1982-11-08
AU552221B2 (en) 1986-05-22
EP0061111A2 (de) 1982-09-29
DE3111137C2 (de) 1985-06-13
ZA821848B (en) 1983-03-30
CA1170977A (en) 1984-07-17

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