CN1183507A - Process for underground gasification of coal in two stage - Google Patents
Process for underground gasification of coal in two stage Download PDFInfo
- Publication number
- CN1183507A CN1183507A CN 95103446 CN95103446A CN1183507A CN 1183507 A CN1183507 A CN 1183507A CN 95103446 CN95103446 CN 95103446 CN 95103446 A CN95103446 A CN 95103446A CN 1183507 A CN1183507 A CN 1183507A
- Authority
- CN
- China
- Prior art keywords
- stage
- coal
- air
- underground
- gas
- 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.)
- Granted
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
A two-stage underground gasifying process for coal features that in the first stage, air is blown to gasify and in the second stage steam is blown to gasify. The influence of N2 on heat value of gas is eliminated. Combustible component is up to 80% or more. N2 content is less than 4%. The gas obtained in the first stage can be used as industrial fuel or for electric generation. The gas obtained in the second stage can be used for civil purpose or as raw gas of chemical materials. The cost of gas is greatly decreased.
Description
The present invention relates to process for underground gasification of coal in two stage, be particularly useful for the underground gasification of mine abandonment coal resources.
For a long time, all adopts both at home and abroad supply continuously fixedly the gasifying agent of component carry out the research and development utilization of coal underground gasification technology, these gasifying agent major parts are air or oxygen-enriched air and add water vapour, and the oxygen-enriched air that adopts air or low concentration is when making gasifying agent, because N in the gasifying agent
2The content height makes to export the N that also contains big component (more than 50%) in the coal gas
2, so the content and the calorific value of comhustible component is all lower in the coal gas, thus limited the use of product coal gas; When the oxygen-enriched air of employing high concentration was made gasifying agent, because the restriction of restricted oxygen technical level, its system oxygen cost was higher, thereby gas cost is increased considerably.
Problem in view of prior art exists the purpose of this invention is to provide a kind of coal underground gasifying technology, utilizes air and water vapour to produce high heating value gas, and the scope of application of product coal gas is enlarged, and reduces gas cost.
Underground gasification of coal in two stage of the present invention, at the mine underground coal gasification(UCG), comprise machine room, the observing and controlling chamber, combustion tower, cooling pond, scrubbing tower, empty spray tower, the emptying tower, flow meter, valve, appendix, blast fan, can in mine coal seam, set up the big section underground gasification furnace of long-channel, the gasification furnace port is positioned at seat earth and beats the hole of inclining and creeps into along the coal seam, gasification furnace is provided with thermometer hole, steam hole, air inlet, steam vent, steam vent is communicated with the formation gasification tunnel, to underground gasification furnace circulation air supply and water vapour, each circulation was made up of two stages, phase I drum air, second stage drum water vapour.Phase I blasts air from air inlet, is stage regenerator, and production low heat value blast gas is as CO and CO
3The degree sum reach 26% when above, stop air feed and enter second stage, blast water vapour from air vent, be the drum water vapour stage, produce high heating value underground water coal gas, when CO content is lower than 5% in the outlet coal gas, then stop the steam that supplies water, again blast air by air inlet, realize a circulation.
Process for underground gasification of coal in two stage of the present invention is divided into two stages with the underground coal gasification(UCG) process and carries out, and promptly rouses air stage and drum steam phase.This technology phase I can be produced calorific value at 4.18MJ/m
3About coal gas, can be used as industrial fuel or generating, second stage can be produced calorific value at 12.56MJ/m
3Above coal gas, the content of comhustible component is more than 80%, and eliminated N
2To the influence of calorific value of gas, N
2Content is lower than 4%, can be used as the unstripped gas that the city is civilian or production is pure, compared with prior art, can produce two kinds of coal gas that calorific value is different, uses for difference or mixing, has improved gasification efficiency, and second stage can obtain calorific value at 10m
3/ Nm
3Above high heating value gas rises in value coal significantly, has practicality widely.
Process for underground gasification of coal in two stage of the present invention, under the condition that does not change original equipment, to underground gasification furnace circulation air supply and water vapour, each circulation has two stages, and the phase I is drum air stage regenerator, production low heat value blast gas; Second stage is the drum water vapour stage, produces high heating value underground water coal gas.Phase I blasts air from air inlet, observes coal gas component and calorific value at any time, as CO and CO
2Degree reach 26% when above, then stop air feed immediately, enter second stage, second stage blasts water vapour from air inlet, and measure component and the calorific value that exports coal gas at any time, when CO content is lower than 5%, then stop the steam that supplies water, again blast air from air inlet, realize a circulation.When the phase I blow rate required is 3600m
3/ h, the time ratio of phase I and second stage are 1: 1, and the component and the calorific value of second stage high heating value underground water coal gas are seen attached list.
No. two well underground coal gasification(UCG)s in table 2 Xinhe River half type approval test two stage gas metallization processes result of the tests
1994 (second stage)
Claims (3)
1. process for underground gasification of coal in two stage, it comprises Ventilator Room, the observing and controlling chamber, combustion tower, cooling pond, scrubbing tower, empty spray tower, the emptying tower, flow meter, valve, appendix, blast fan, can in mine coal seam, set up the big section underground gasification furnace of long-channel, the gasification furnace port is positioned at seat earth and beats the hole of inclining and creeps into along the coal seam, gasification furnace is provided with thermometer hole, steam hole, air inlet, steam vent is communicated with the formation gasification tunnel, it is characterized in that: to underground gasification furnace circulation air supply and water vapour, each circulation was made up of two stages, phase I drum air, second stage drum water vapour.
2. coal underground gasifying technology according to claim 1, it is characterized in that: the phase I blasts air from air inlet, as CO and CO
2The degree sum reach 26% when above, stop air feed and enter second stage.
3. coal underground gasifying technology according to claim 1, it is characterized in that: second stage blasts water vapour from air inlet, when CO content is lower than 5% in the outlet coal gas, stops the steam that supplies water.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95103446A CN1062329C (en) | 1995-03-14 | 1995-03-14 | Process for underground gasification of coal in two stage |
| PCT/CN1995/000050 WO1996028637A1 (en) | 1995-03-14 | 1995-06-14 | A two-stage of method for gasificating undergrounds coal in situ |
| AU27314/95A AU2731495A (en) | 1995-03-14 | 1995-06-14 | A two-stage of method for gasificating undergrounds coal in situ |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95103446A CN1062329C (en) | 1995-03-14 | 1995-03-14 | Process for underground gasification of coal in two stage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1183507A true CN1183507A (en) | 1998-06-03 |
| CN1062329C CN1062329C (en) | 2001-02-21 |
Family
ID=5074724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95103446A Expired - Fee Related CN1062329C (en) | 1995-03-14 | 1995-03-14 | Process for underground gasification of coal in two stage |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1062329C (en) |
| AU (1) | AU2731495A (en) |
| WO (1) | WO1996028637A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101382065B (en) * | 2008-09-04 | 2012-05-02 | 乌兰察布新奥气化采煤技术有限公司 | No-shaft underground gasification process |
| CN104066926A (en) * | 2012-06-28 | 2014-09-24 | 碳能源有限公司 | A method for shortening an injection pipe for underground coal gasification |
| CN109252842A (en) * | 2018-10-29 | 2019-01-22 | 邓晓亮 | Overcritical underground coal gasification(UCG) output mixed gas trilogy supply electricity generation system |
| CN109477009A (en) * | 2016-06-03 | 2019-03-15 | 野火能源有限公司 | A kind of product and method of gas |
| CN111101942A (en) * | 2018-10-29 | 2020-05-05 | 西安科技大学 | Method and system for recovering residual coal on lower wall in caving coal mining of inclined extra-thick coal seam |
| CN114856525A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气集团有限公司 | Experimental system and method for simulating gathering and transportation of crude gas produced by underground coal gasification |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9435184B2 (en) | 2012-06-28 | 2016-09-06 | Carbon Energy Limited | Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification |
| CN110749522B (en) * | 2019-11-13 | 2020-09-22 | 扎鲁特旗扎哈淖尔煤业有限公司 | Crushing type coal quality identification device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US426357A (en) * | 1890-04-22 | Attachment for saw-mills | ||
| 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 |
| 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 |
| US4296809A (en) * | 1980-07-21 | 1981-10-27 | Gulf Research & Development Company | In situ gasification of bituminous coal |
| SU1726739A1 (en) * | 1989-02-13 | 1992-04-15 | Ташкентский Политехнический Институт Им.А.Р.Бируни | Method of underground coal gasification |
-
1995
- 1995-03-14 CN CN95103446A patent/CN1062329C/en not_active Expired - Fee Related
- 1995-06-14 WO PCT/CN1995/000050 patent/WO1996028637A1/en active Application Filing
- 1995-06-14 AU AU27314/95A patent/AU2731495A/en not_active Abandoned
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101382065B (en) * | 2008-09-04 | 2012-05-02 | 乌兰察布新奥气化采煤技术有限公司 | No-shaft underground gasification process |
| CN104066926A (en) * | 2012-06-28 | 2014-09-24 | 碳能源有限公司 | A method for shortening an injection pipe for underground coal gasification |
| CN104066926B (en) * | 2012-06-28 | 2017-08-22 | 碳能源有限公司 | Method for shortening the ascending pipe for underground gasification |
| CN107806331A (en) * | 2012-06-28 | 2018-03-16 | 碳能源有限公司 | Method for shortening the ascending pipe for underground gasification |
| CN109477009A (en) * | 2016-06-03 | 2019-03-15 | 野火能源有限公司 | A kind of product and method of gas |
| CN109477009B (en) * | 2016-06-03 | 2021-09-14 | 野火能源有限公司 | Gas product and method |
| CN109252842A (en) * | 2018-10-29 | 2019-01-22 | 邓晓亮 | Overcritical underground coal gasification(UCG) output mixed gas trilogy supply electricity generation system |
| CN111101942A (en) * | 2018-10-29 | 2020-05-05 | 西安科技大学 | Method and system for recovering residual coal on lower wall in caving coal mining of inclined extra-thick coal seam |
| CN109252842B (en) * | 2018-10-29 | 2024-04-12 | 邓晓亮 | Mixed gas triple power generation system produced by underground supercritical coal gasification |
| CN114856525A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气集团有限公司 | Experimental system and method for simulating gathering and transportation of crude gas produced by underground coal gasification |
| CN114856525B (en) * | 2021-02-04 | 2024-03-01 | 中国石油天然气集团有限公司 | Experimental system and method for simulating underground gasification of coal to produce crude gas for gathering and transportation |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2731495A (en) | 1996-10-02 |
| WO1996028637A1 (en) | 1996-09-19 |
| CN1062329C (en) | 2001-02-21 |
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