WO1996028637A1 - Procede a deux etapes pour la gazeification in situ du charbon souterrain - Google Patents

Procede a deux etapes pour la gazeification in situ du charbon souterrain Download PDF

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Publication number
WO1996028637A1
WO1996028637A1 PCT/CN1995/000050 CN9500050W WO9628637A1 WO 1996028637 A1 WO1996028637 A1 WO 1996028637A1 CN 9500050 W CN9500050 W CN 9500050W WO 9628637 A1 WO9628637 A1 WO 9628637A1
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WO
WIPO (PCT)
Prior art keywords
stage
gasification
underground
coal
gas
Prior art date
Application number
PCT/CN1995/000050
Other languages
English (en)
Chinese (zh)
Inventor
Li Yu
Jie Liang
Weilian Zhang
Feng Yu
Original Assignee
China University Of Mining And Technology
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 China University Of Mining And Technology filed Critical China University Of Mining And Technology
Priority to AU27314/95A priority Critical patent/AU2731495A/en
Publication of WO1996028637A1 publication Critical patent/WO1996028637A1/fr

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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
    • E21B43/243—Combustion in situ

Definitions

  • the present invention relates to a method for coal gasification, and more particularly to a method for underground coal gasification. Background technique
  • gas welling agents such as pitless underground gasifiers, continuous air supply, and water-rich steam to conduct research and development of underground coal gasification technology.
  • gasification channel of the wellless gasifier Due to the limitation of the technical level of the gasification channel penetration, the gasification channel of the wellless gasifier has a small diameter and short length, so the air supply resistance is large, the stable gas production capacity is poor, the gas production is small, the service time is short, and the furnace construction and operating costs High gas cost; when using air or rich gas as gasifying agent, the N 2 content in the gas is higher, so its calorific value is lower, which limits the range of gas use; when pure radon gasification is used, The cost of gas production is high, resulting in a substantial increase in gas costs. Due to the above reasons, it has been difficult for the wellless coal underground gasification technology to move towards commercial application.
  • the object of the present invention is to provide a coal underground gasification method that can inexpensively produce air gas and high-calorific groundwater gas and can achieve commercial production.
  • the present invention provides a method for underground coal gasification.
  • the method is to select a suitable coal seam in a mine, construct an air exhaust hole and an auxiliary air supply hole from the ground, dig a coal lane under the mine, and discharge it
  • the air holes are connected to form a gasification channel, and an auxiliary air duct, a coal pile, and an igniter are arranged in the gasification channel to form an underground gasification furnace and isolate the gasification furnace from the mine.
  • the characteristics are: After the furnace is ignited, air and water vapor are circulated and supplied to the underground gasification furnace. Each cycle consists of two stages.
  • the first stage air is blown to produce low-heat-value blast gas until CO and C 0 in the low-heat-value blast gas obtained.
  • the percentage amounts of co-2 and more than 26% into the second stage, the second stage drum vapor producing high calorific value gas groundwater, until the heat value of the resulting CO binding amount less than 5% of underground coal gasification, re-entering the first stage .
  • the present invention is implemented by the following method, selecting a suitable coal seam in a mine, and constructing air inlet and exhaust holes (11, 15) and auxiliary air supply holes (12, 1 3) from the ground.
  • Coal tunnels are dug underground to connect the inlet and exhaust holes to form a gasification channel.
  • An auxiliary air duct ( 20 ), a coal pile (19), and an igniter are arranged in the gasification passage to form an underground gasification furnace.
  • An underground gasification station is formed on the ground by a fan room (1), a purification system [including air spray ⁇ (6) and washing ⁇ (5)], and an air supply pipeline.
  • the total air supply system is composed of several air supply holes (1 1, 1 5, 1 2, 1 3), which are used in combination according to the blockage of the channel after the roof has risen.
  • air and water vapor are circulated to the underground gasification furnace.
  • Each cycle consists of two stages. The first stage is the drum air heat storage stage and produces low-heat value blast gas. The second stage is the drum. In the steam phase, high-calorific underground ice gas is produced.
  • the air inlet and exhaust holes (11, 15) and the auxiliary air supply holes (12, 1 3) can be implemented by ordinary drilling technology.
  • the entire drilling depth requires casing, and its diameter depends on the coal gas production.
  • Inlet and exhaust holes (1 1, 1 5) usually located at the bottom of the coal seam or drilling inclined holes to drill along the coal seam, if necessary, connect it to the gasification channel with a rock lane.
  • the gasification channel is excavated along the coal seam, and the support is taken from the looseness of the coal seam and the ground pressure. It can be supported by bolts, sheds, steel supports or hybrid support.
  • the length of the passage depends on the coal seam occurrence conditions and the blast pressure, and should be greater than 150 meters.
  • a coal pile is set up every 20 meters in the gasification channel.
  • the auxiliary channel is located in the middle of the bottom of the gasification channel, and is made of ordinary bricks into a square channel, with flower walls on both sides, and a steel pipe is placed under the air inlet, which is directly connected to the auxiliary channel to form a separate air supply system.
  • the igniter can be made by a common electric furnace of 2 KW, starting at 15 m from the air intake hole, one set is set every 10 m. Generally, 3 sets are required, and each set consists of 2 igniters. Place a layer of flammable briquettes on top of the igniter, then a layer of firewood, and a layer of high-quality large-sized coal on the top. The overall height is similar to the height of the coal pile.
  • the gasification furnace After the gasification furnace is ignited, the gasification furnace is first subjected to air combustion and preheating. After the temperature field conditions of the gasification furnace are formed, it enters two-stage production.
  • the first stage of this method can produce gas with a heating value of about 4 ⁇ 18 MJ / m 3 , which can be used as industrial fuel or used for power generation.
  • the calorific value in the second stage is 1 2.
  • FIG. 1 is a schematic diagram of an apparatus for implementing the two-stage underground coal gasification method of the present invention. Wherein, the description of each symbol is as follows:
  • 16 a U-shaped tube; 17-underground gasification furnace; 18-gasification coal seam;
  • Example 1 of the preferred embodiment of the present invention The semi-industrial test of underground coal gasification in Xuzhou Xinhe No. 2 well. According to the device shown in FIG. Among them, the inlet and exhaust holes of the test gasifier have a diameter of 0.6 m and a depth of 83 m. Three auxiliary air supply holes are arranged in each of them.
  • the gasification channel is 168 m in length and the net section of the channel is It is 2.5 m 2 , with a concrete shed and a steel support mixed support. Three groups of igniters are arranged in the gasification channel.
  • the front of the eight coal pile auxiliary channels is 1 1.3 m with bricks of 0.2 m.
  • the square channel is 0.2 m 2, and the rear 3 5 m is connected with a ceramic tube of 0 3 5 X 7 0.
  • the test was ignited on March 23, 1994, and the gas was released on May 25, with stable gas production for 10 months.
  • a two-stage test was carried out in the later stage, and the calorific value and composition of the gas in the second stage are shown in Table 1.
  • Gas flow date ⁇ 2 CO CH 4 C0 2 N 2 kcal / m 3 J / m 3 m 3 / h
  • the method of the present invention can effectively reduce the cost of underground coal gasification and commercialize the underground coal gasification method.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Industrial Gases (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

Procédé à deux étapes pour la gazéification in situ du charbon souterrain, consistant à former des trous d'injection, un trou de production et un four de gazéification souterrain. Dans la première étape, on introduit dans ce four de l'air comprimé, et dans la seconde étape, on insuffle de la vapeur tout en procédant à l'extraction du gaz de houille renfermant du CO et du CO2. Les deux étapes forment un cycle: la seconde étape démarre lorsque la teneur en CO et en CO2 du gaz de houille à pouvoir calorifique peu élevé est supérieure à 26 %, puis la première étape commence lorsque la teneur en CO du gaz de houille à pouvoir calorifique élevé est inférieure à 5 %.
PCT/CN1995/000050 1995-03-14 1995-06-14 Procede a deux etapes pour la gazeification in situ du charbon souterrain WO1996028637A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU27314/95A AU2731495A (en) 1995-03-14 1995-06-14 A two-stage of method for gasificating undergrounds coal in situ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN95103446A CN1062329C (zh) 1995-03-14 1995-03-14 两阶段煤炭地下气化工艺
CN95103446.4 1995-03-14

Publications (1)

Publication Number Publication Date
WO1996028637A1 true WO1996028637A1 (fr) 1996-09-19

Family

ID=5074724

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN1995/000050 WO1996028637A1 (fr) 1995-03-14 1995-06-14 Procede a deux etapes pour la gazeification in situ du charbon souterrain

Country Status (3)

Country Link
CN (1) CN1062329C (fr)
AU (1) AU2731495A (fr)
WO (1) WO1996028637A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9428978B2 (en) 2012-06-28 2016-08-30 Carbon Energy Limited Method for shortening an injection pipe for underground coal gasification
US9435184B2 (en) 2012-06-28 2016-09-06 Carbon Energy Limited Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification
CN110749522A (zh) * 2019-11-13 2020-02-04 磐安叶层煤矿设备有限公司 一种粉碎式煤品质鉴别装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101382065B (zh) * 2008-09-04 2012-05-02 乌兰察布新奥气化采煤技术有限公司 无井式地下气化工艺
ES2966552T3 (es) * 2016-06-03 2024-04-22 Wildfire Energy Pty Ltd Producción de un gas y métodos para ello
CN111101942B (zh) * 2018-10-29 2021-08-06 西安科技大学 倾斜特厚煤层放顶煤开采下盘残留煤炭回收方法及系统
CN109252842B (zh) * 2018-10-29 2024-04-12 邓晓亮 超临界煤炭地下气化产出混合气体三联供发电系统
CN114856525B (zh) * 2021-02-04 2024-03-01 中国石油天然气集团有限公司 模拟煤炭地下气化产出粗煤气集输的实验系统及方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US429285A (en) * 1890-06-03 Artificial tooth
US3734184A (en) * 1971-06-18 1973-05-22 Cities Service Oil Co Method of in situ coal gasification
US4026357A (en) * 1974-06-26 1977-05-31 Texaco Exploration Canada Ltd. In situ gasification of solid hydrocarbon materials in a subterranean formation
US4296809A (en) * 1980-07-21 1981-10-27 Gulf Research & Development Company In situ gasification of bituminous coal
SU1726739A1 (ru) * 1989-02-13 1992-04-15 Ташкентский Политехнический Институт Им.А.Р.Бируни Способ подземной газификации углей

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US426357A (en) * 1890-04-22 Attachment for saw-mills
US4269809A (en) * 1979-12-19 1981-05-26 Uop Inc. Recovery in titanium metal values by solvent extraction
US4299285A (en) * 1980-07-21 1981-11-10 Gulf Research & Development Company Underground gasification of bituminous coal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US429285A (en) * 1890-06-03 Artificial tooth
US3734184A (en) * 1971-06-18 1973-05-22 Cities Service Oil Co Method of in situ coal gasification
US4026357A (en) * 1974-06-26 1977-05-31 Texaco Exploration Canada Ltd. In situ gasification of solid hydrocarbon materials in a subterranean formation
US4296809A (en) * 1980-07-21 1981-10-27 Gulf Research & Development Company In situ gasification of bituminous coal
SU1726739A1 (ru) * 1989-02-13 1992-04-15 Ташкентский Политехнический Институт Им.А.Р.Бируни Способ подземной газификации углей

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9428978B2 (en) 2012-06-28 2016-08-30 Carbon Energy Limited Method for shortening an injection pipe for underground coal gasification
US9435184B2 (en) 2012-06-28 2016-09-06 Carbon Energy Limited Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification
US9963949B2 (en) 2012-06-28 2018-05-08 Carbon Energy Limited Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification
US9976403B2 (en) 2012-06-28 2018-05-22 Carbon Energy Limited Method for shortening an injection pipe for underground coal gasification
CN110749522A (zh) * 2019-11-13 2020-02-04 磐安叶层煤矿设备有限公司 一种粉碎式煤品质鉴别装置

Also Published As

Publication number Publication date
CN1062329C (zh) 2001-02-21
AU2731495A (en) 1996-10-02
CN1183507A (zh) 1998-06-03

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