Conditions for safe underground gasification of lignite in Poland

Particular attention was paid to geotechnical problems encountered during lignite mining in Polish deposit conditions. Geotechnical protection of safe lignite utilization by its gasification involves many issues such as presence of underground water, predicted land subsidence and deformation, etc. G...

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Veröffentlicht in:Розробка родовищ
Datum:2013
Hauptverfasser: Kudelko, J., Nowak, J.
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Sprache:Englisch
Veröffentlicht: УкрНДМІ НАН України, Інститут геотехнічної механіки НАН України 2013
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Zitieren:Conditions for safe underground gasification of lignite in Poland / J. Kudelko, J. Nowak // Розробка родовищ: Зб. наук. пр. — 2013. — Т. 7. — С. 399-404. — Бібліогр.: 1 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine
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author Kudelko, J.
Nowak, J.
author_facet Kudelko, J.
Nowak, J.
citation_txt Conditions for safe underground gasification of lignite in Poland / J. Kudelko, J. Nowak // Розробка родовищ: Зб. наук. пр. — 2013. — Т. 7. — С. 399-404. — Бібліогр.: 1 назв. — англ.
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container_title Розробка родовищ
description Particular attention was paid to geotechnical problems encountered during lignite mining in Polish deposit conditions. Geotechnical protection of safe lignite utilization by its gasification involves many issues such as presence of underground water, predicted land subsidence and deformation, etc. Great importance is attached to surface facilities and buildings safety and to protection of urban areas. Особлива увага приділялася геотехнічним проблемам, з якими стикаються при видобутку бурового вугілля в Польщі. При геотехнічному захисті безпечного видобутку бурого вугілля за допомогою газифікації виникає багато проблем, таких як: наявність підземних вод, просідання земної поверхні, деформація і т.д. Величезне значення приділяється наземним спорудам, їх безпеці та охороні міських районів. Особое внимание уделялось геотехническим проблемам, с которыми сталкиваются при добыче бурового угля в Польше. При геотехнической защите безопасной добычи бурого угля с помощью газификации возникает много проблем, таких как: наличие подземных вод, проседание земной поверхности, деформация и т.д. Огромное значение уделяется наземным сооружениям, их безопасности и охране городских районов.
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fulltext 399 УДК 622.278 © J. Kudelko, J. Nowak J. Kudelko, J. Nowak CONDITIONS FOR SAFE UNDERGROUND GASIFICATION OF LIGNITE IN POLAND Particular attention was paid to geotechnical problems encountered during lignite mining in Polish deposit conditions. Geotechnical protection of safe lignite utilization by its gasification involves many issues such as presence of underground water, predicted land subsidence and deformation, etc. Great importance is attached to surface facilities and buildings safety and to protection of urban areas. УМОВИ ДЛЯ БЕЗПЕЧНОЇ ПІДЗЕМНОЇ ГАЗИФІКАЦІЇ ПРИ ВИДОБУТКУ БУРОГО ВУГІЛЛЯ У ПОЛЬЩІ Особлива увага приділялася геотехнічним проблемам, з якими стикаються при видобутку бурового вугілля в Польщі. При геотехнічному захисті безпечного видобутку бурого вугілля за допомогою газифікації виникає багато проблем, таких як: наявність підземних вод, просідання земної поверхні, деформація і т.д. Величезне значення приділяється наземним спорудам, їх безпеці та охороні міських районів. УСЛОВИЯ ДЛЯ БЕЗОПАСНОЙ ПОДЗЕМНОЙ ГАЗИФИКАЦИИ ПРИ ДОБЫЧЕ БУРОГО УГЛЯ В ПОЛЬШЕ Особое внимание уделялось геотехническим проблемам, с которыми сталкиваются при добыче бурового угля в Польше. При геотехнической защите безопасной добычи бурого угля с помощью газификации возникает много проблем, таких как: наличие подземных вод, проседание земной поверхности, деформация и т.д. Огромное значение уделяется наземным сооружениям, их безопасности и охране городских районов. INTRODUCTION Methods of lignite utilization by its gasifi- cation have been known for a long time and have been successfully applied during last decades, especially the underground gasifica- tion. Most of output in this method develop- ment comes from numerous studies and appli- cations carried out in former Soviet Union countries. Those achievements were imple- mented in dynamic development of many countries. Currently the research studies on using the underground gasification of lignite are carried out in Poland funded by the science grants but also by KGHM Polska Miedź SA. The domi- nating opinion in the company says that the word experience should be utilized in order to shorten the research period before implemen- tation of commercial installations. In light of previous technological achievements such ap- proach will substantially accelerate the possi- bility of practical application of underground gasification of lignite (PZWB). One of the barrier, in implementing this method, is a way of reporting the lignite re- sources and legal procedure while applying for exploration and mining concession. Stand- 400 ing regulations concerning the above issues is very favorable for the open pit mining meth- ods. According to these regulations, under- ground gasification of lignite is regarded as lignite mining through unconventional method. GEOLOGY OF LIGNITE DEPOSIT AREAS IN RESPECT OF PZWB IMPLEMENTATION Geology of lignite deposit areas in Poland is very complex. The lignite beds are usually horizontal or with little inclination but also a disturbed beds are encountered. Thus the techniques of underground gasification spe- cific for horizontal beds will dominate. They are much more difficult in practice than the ones applied in case of deposits having big inclination. The lignite may have a form of many beds or one very thick bed, for example 35 m ore more, but also it may be divided into several layers. Typical is high humidity of lignite beds, reaching 40-50%, what in turn causes problems with dewatering and dosing the va- por necessary in gasification process. More- over, in the overburden multi-layer complex systems of different soils such as: sands, clays, muds, aggregates i.e. mostly crushed formations, occur. Very often the over-lignite beds are aquifers, what is a great challenge while draining them and preparing the opera- tion of underground gas generators. Complex structure of the overburden requires such lo- cation of gas generators to have the imperme- able soils within the zone of continuous de- formations, therefore at the proper distance over the high temperature sectors. It is aimed to protect the tight bed from the thermal im- pact and the structural changes. If it is impos- sible, the additional engineering methods of sealing the zones over the gas generators should be used. Separate and very important issue is a pro- tection of surface and underground water res- ervoirs. Since the researches show attenuation of contamination 30 meters from its source, it is deemed that minimal distance from the res- ervoir should be 40 m. Utilization of such 10 m long safety zone is, however, not always sufficient. Additional analyze of geological and water conditions of the deposit area where gasification is planned becomes necessary. In such cases model studies using advanced software, basing on finite elements method, are the most justified. HYDROGELOGICAL CONDITIONS Table 1 Utility aquifers and main under- ground water reservoirs Beds occurring below utility aquifers (minimal distance 40 m), ab- sence of main underground water reservoirs in close vicinity of pro- spective extraction field (minimal distance – 2 km) Porosity of surrounding rocks Rocks above and below the deposit sholud have smaller gas perme- ability than the lignite bed, Thickness of rock with low permeability surrounding the lignite bed should be 1-2 m for 2 m thick lignite bed or 2-4 m for 3-10 m lignite bed Water inflow Maximum volume of water necessary gas production is 0.5 ton per 1 ton of gasified lignite, water surplus should be pumped out Filtration properties of rocks Lignite bed porosity vs. surrounding rock porosity should not be smaller than 18:20 One of the crucial issue while using PZWB method is protection against excessive subsidence, especially of non-continuous na- ture. In many countries using PZW installa- tions, the surface subsidence problem is of smaller importance due to location of the site where the extraction is carried out or because of specific outcrop structure. It may be a de- populated land or located on mining area, where extraction using other methods takes 401 place or the overburden is formed of soft rocks. However, in Poland the population is high, the surface infrastructure is complex: roads, numerous buildings, railways, power supply lines etc. In such situation the land subsidence is not acceptable. The overburden occurring over the lignite deposit is formed of loose soil beds. These are sands of different granulation, often water saturated, clays, silts, muds and others. Layers of such soil are often interrupted, have nu- merous lens and admixtures and structural discontinuities. Under such conditions, subsi- dence is integral process accompanying this type of extraction. In case of PZW the subsi- dence is bigger because the over lying soils are the subject of additional deformations re- sulting from thermo-consolidation processes i.e. changes of humidity, swelling and shrink- ing, cracking and uncontrolled water flows. SUSTAINABLE DEVELOPMENT AND PZWB METHOD Objective with regard of sustainable de- velopment is an effort to maintain the bal- anced relations between technical progress, environmental protection and economic de- velopment. PZW method is relatively cheap, however, in case of adverse deposit parame- ters costs of its application increase. Also pro- tecting the environment from its negative im- pact may be expensive. In this instance the location of deposit is of vital importance, Table 2. SITE CONDITIONS FOR PZW INSTALLATION Table 2 Area required for PZW installation minimal area for pilot installation is 50-100 ha (0.5-1 km2), for commercial installation over 100 ha, changing location Safety conditions Minimal distance from: residential areas (1-3 km), rivers and lakes (1-3 km), protection areas (5 km), operating mines/mining areas (5 km), closed mines/workings (3 km), power lines and railroads (1-3 km) Legal conditions Preparing the opinion on environmental impact, identifying land property, getting concession for deposit exploration, geological study concerning prob- able mineral reserves, public consultation, delimitation of mining area and getting concession for deposit extraction, buying the land When planning the location of area for underground gasification, the critical elements of infrastructure and environment, present over the deposit, must be taken into consid- eration. Among these elements are: land de- velopment (buildings, telecom and power lines, gas mains, roads, railroads), level of land use, distance from old mine workings and operating conventional mines, environ- mental conditions (soils, forests, protection areas, lakes, rivers). All those factors may be decisive with regard of possibility of using the method in agreement with environment and community development. Currently high capacity installations for underground gasification are widely used. However, they are not suitable for very big deposits, which, when mined using open pit method, give 20-30 million tons per year dur- ing many years. Conventional method does not need also great volumes of backfilling ma- terial preventing the subsidence. While the PZW method does not guarantee the devel- opment of whole big deposit but only a part of it, due to the demand for huge amount of backfilling material. In such case constructing many smaller in- stallations spread over the big area seems to be reasonable. It is important to diversify the energy sources and to limit the power loses on big transmission lines. Underground gasification systems give the wide range of products with different applica- tion such as energetic gas, heat, power energy, liquid fuels (oil and gas) and numerous valu- able but less commonly used products. For 402 first Polish implementations the most reason- able is production of energetic gas, power en- ergy and heat energy manufactured in the co- generation systems. GEOTECHNICAL PROTECTION IN PZWB METHOD IMPLEMENTATION Like in every mine, the geotechnical is- sues are extremely important in case of un- derground lignite gasification. They decide about the possibility of using this method. Geotechnical processes occurring during the lignite mining from Polish deposits concern many elements of their development. Geo- technical protection aimed to assure the safe utilization of lignite reserves using this method refers to underground water, predicted land subsidence and deformations, mining system and environmental protection. When PZW method is used, the effective drainage of the part of lignite deposit destined for gasification is of great importance. In some cases not only drainage will be neces- sary but also silting-up the extremely perme- able aquifers. It may be necessary to maintain the water inflow on the level enabling the proper gasification process. Otherwise the syngas parameters will be on inadequate level. Under Polish conditions extremely impor- tant is backfilling the voids formed as a result of gasification. The geological structure and processes occurring inside the overburden layers show that these voids will be formed generally in the lignite bed and inside the overburden. It is a result of roof collapse due to the stability loss. The overburden falling into the voids and solid products of gasifica- tion are porous. Blow gases flow well through the empty spaces despite the rubble formation, and at the same time the loosen overburden and empty rooms shift upwards. In such case the backfilling may be held even in the over lignite zone. It requires the proper identifica- tion of room location in order to fill it with backfilling material as fully as possible. Both hydraulic and pneumatic methods may be used there. When the beds are thicker and there are several gas generators (lignite beds) caving results in adding the post-reaction voids what in turn allow for better filling them. Thus the backfilling effectiveness is better. Further subsidence protection may be achieved by using the proper organization of mining operations. Gasification may be carried out along the line courses, leaving the tempo- rary, safety pillars between them. After gasifi- cation of lignite along two lines and backfilling them, the gasification of pillar between two lines can be started. Such organization of min- ing effectively prevents the subsidence and at the same time allows for efficient utilization of deposit as well as reduction of loses. Using adequate and properly selected geo- technical solutions is a condition for correct operation of the installation and protection against adverse impact on the environment. CONDITIONS FOR IMPLEMENTING THE METHOD IN POLAND The basis during implementation of PZW method and constructing the installation for underground gasification are the project as- sumptions which describe the function, power and period of enterprise in details and thereby specify the minimal level of lignite reserves. When it is planned to extend the project it is necessary to provide the possibility of mining further mining fields. Planned installations for underground gasification must meet the requirements of: – Geological and mining law; – Power energy law; – Environmental protection law; – Building law; – Land development plan. Consistency with above legal document impose many, difficult to meet, conditions, which implementation may continue over even several years. The possibility of using underground lig- nite gasification in Poland meets with big public expectations. It mostly results from the belief that this method can totally replace open pit mining, widely used now. Disadvan- tage of the latter, in public opinion, is the deg- 403 radation of environment. Most often it is caused by shortage of knowledge, among lo- cal community, about proper procedure of carrying out mining activity and about its ef- fects. There is also lack of common knowl- edge concerning the legal requirements with regard of planning and monitoring such pro- jects. Before launching any project the vide information campaign should be carried out among local population about safety issues concerning social and environmental aspects of the investment. SPECIFICATION OF QUALIFICATION CRITERIA FOR LIGNITE BEDS DESTINED FOR UNDERGROUND GASIFICATION Table 3 Qualification criterion Characteristics Type of lignite xylite, xylite-earthy, earthy, bituminous Physical & chemical properties of lignite critical for gasification process Preferred lignite with ash content below 20%, and low sulphur content Thickness of lignite bed More than 2 m, optimal – 4 m and more Depth of lignite bed Recommended more than 150 m Inclination of lignite bed Preferred horizontal seams or small angle Rock mass and surrounding rocks tectonics Preferred absence of cracks and big tectonic distur- bances (faults) Lithology of overburden rocks Preferred grounds of small permeability (clays, silts, muds) Water conditions Preferred beds laying below utility aquifers (minimal assumed distance – 40 m), absence of main under- ground water reservoirs in the vicinity of planned installations Reserves volume – research installation; minima reserves of 75,000 – 450,000 tons of lignite, – commercial installation; min. 3.5 million ton sof lignite. Preliminary safety conditions Preferred absence of surface facilities, rivers, lakes, protected areas Under the shortage of information the method of underground gasification is re- garded as equal alternative for open pit min- ing. However, it is not always reasoned. Poland has quite big reserves of lignite. Thus all available and technically processed methods of its extraction should be used. It is also possible to use the PZW method as sup- plementary with relation to open pit mining on the same deposit or its part. Anyway the correctly elaborated technical design is neces- sary. The method of lignite deposit evaluation if it qualifies for gasification, presented here, is only a preliminary one. Different engineering measures are possible to improve the gasifica- tion conditions resulting from geological and hydrogeological conditions. However, addi- tional engineering methods may be expensive thus the final decision about applying the gasification depends on the cost-effectiveness of the project. The latter will change in the course of time depending on costs, prices, technical progress etc. Each project requires complex economic evaluation in order to identify possible to obtain profits offered by this method. In case of PZW installation the biggest impact on costs have drillings made to build the exploitation (air blow and syngas extrac- tion) and drainage wells. Therefore the most productive is gasification of lignite beds hav- ing great thickness. Therefore economic, technical, legal and social factors decide about PZW method im- plementation. 404 СONCLUSIONS Popularity of underground lignite gasifica- tion method consistently increases. It is a re- sult of Clean Lignite Technologies develop- ment. Probably in Poland it will be imple- mented within several years, what is a conse- quence of its development in many countries. Operation of gasification systems for example in China (and other countries) in the commer- cial scale, gives a chance for constructing, in a short time, such installations also in Poland. Implementation of this method requires meeting many legal conditions concerning mining, power energy and building opera- tions. Extremely high expectations concern the environmental issues. Polish environ- mental standards are currently compatible wit European Union ones. The EU also controls observing them. Mining activity subject the special re- quirements. Basing on to date experience con- cerning the preparation of underground gasifi- cation it may be concluded that: 1. Construction of commercial installation in Poland is possible within 6-8 years. 2. The conditions for PZW installation implementation are as follows: – proceeding formal and legal action in cooperation with relevant authorities and elaboration of necessary regulations, – finding the social acceptance for new method, – training the technical staff for handling the gasification system, – carrying our reasonable strategy of lig- nite deposit development (including their pro- tection) with regard of environmental protec- tion policy. REFERENCES 1. Prefeasibility study for pilot installation using under- ground gasification of lignite deposit and project commer- cialization. 2010. KGHM CUPRUM – CBR, Wrocław (not pub- lished). ABOUT AUTHORS Jan Kudelko – professor, vice-president KGHM “CUPRUM” Ltd. – Research and Development Centre. 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id nasplib_isofts_kiev_ua-123456789-104514
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
issn 2415-3435
language English
last_indexed 2025-12-07T18:22:14Z
publishDate 2013
publisher УкрНДМІ НАН України, Інститут геотехнічної механіки НАН України
record_format dspace
spelling Kudelko, J.
Nowak, J.
2016-07-10T17:23:21Z
2016-07-10T17:23:21Z
2013
Conditions for safe underground gasification of lignite in Poland / J. Kudelko, J. Nowak // Розробка родовищ: Зб. наук. пр. — 2013. — Т. 7. — С. 399-404. — Бібліогр.: 1 назв. — англ.
2415-3435
https://nasplib.isofts.kiev.ua/handle/123456789/104514
622.278
Particular attention was paid to geotechnical problems encountered during lignite mining in Polish deposit conditions. Geotechnical protection of safe lignite utilization by its gasification involves many issues such as presence of underground water, predicted land subsidence and deformation, etc. Great importance is attached to surface facilities and buildings safety and to protection of urban areas.
Особлива увага приділялася геотехнічним проблемам, з якими стикаються при видобутку бурового вугілля в Польщі. При геотехнічному захисті безпечного видобутку бурого вугілля за допомогою газифікації виникає багато проблем, таких як: наявність підземних вод, просідання земної поверхні, деформація і т.д. Величезне значення приділяється наземним спорудам, їх безпеці та охороні міських районів.
Особое внимание уделялось геотехническим проблемам, с которыми сталкиваются при добыче бурового угля в Польше. При геотехнической защите безопасной добычи бурого угля с помощью газификации возникает много проблем, таких как: наличие подземных вод, проседание земной поверхности, деформация и т.д. Огромное значение уделяется наземным сооружениям, их безопасности и охране городских районов.
en
УкрНДМІ НАН України, Інститут геотехнічної механіки НАН України
Розробка родовищ
Екологія
Conditions for safe underground gasification of lignite in Poland
Умови для безпечної підземної газифікації при видобутку бурого вугілля у Польщі
Условия для безопасной подземной газификации при добыче бурого угля в Польше
Article
published earlier
spellingShingle Conditions for safe underground gasification of lignite in Poland
Kudelko, J.
Nowak, J.
Екологія
title Conditions for safe underground gasification of lignite in Poland
title_alt Умови для безпечної підземної газифікації при видобутку бурого вугілля у Польщі
Условия для безопасной подземной газификации при добыче бурого угля в Польше
title_full Conditions for safe underground gasification of lignite in Poland
title_fullStr Conditions for safe underground gasification of lignite in Poland
title_full_unstemmed Conditions for safe underground gasification of lignite in Poland
title_short Conditions for safe underground gasification of lignite in Poland
title_sort conditions for safe underground gasification of lignite in poland
topic Екологія
topic_facet Екологія
url https://nasplib.isofts.kiev.ua/handle/123456789/104514
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