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Masters DonNTU

Uhimenko Iryna Urievna

Department:  Geotechnology and Management Speciality:   labor activity safety Theme of master's work: Deadlocked developmend ventilation in normal and emergency modes in the conditions of State Enterprise “Torezantratsyt” “Progress” mine Chief scientist:  “Labor protection and aerology” department associate professor Tchystuhin Viatcheslav Vladimirovych

ABSTRACT

TABLE OF CONTENTS

1. INTRODUCTION

      Coal industry has always been of paramount importance in the national economical complex of Ukraine.

      The main cul-de-sac ventilation goal is air-feeding, ensuring the speed of its movement appropriate for effective airing of bottomhole formation zone, as well as the whole course.

2. THE AIM OF THE WORK

3. GENERAL INFORMATION ABOUT STATE ENTERPRISE “TOREZANTRATSYT” “PROGRESS” MINE

      “Progress” mine was put into commission in December 1973 with the project capacity of 1800 000 tons per year.

      Mine field is taped with the following main central shafts: skip shaft, cage shaft, cage number 2 shaft, and also ventilating shafts – northern and southern ones.

      As far as its methane content is concern “Progress” mine is rated as super-categorical Not dangerous in reference to sudden emissions and dust. Mine water inflow is normal, equaling 350-400 m³ per hour, with 500 m³ per hour highest possible.

4. STATE ENTERPRISE “TOREZANTRATSYT” “PROGRESS” MINE THERMAL CONDITIONS

     Among the main reasons causing unfavorable microclimate within the longwalls of cul-de-sac development drifts are the following:

• Insufficient air supply rate for blocks, longwalls, cul-de-sac development drifts ventilation;
• Large extend and branching of air supplying courses;
• Air supplying courses watering;
• Non efficient in thermal factor block ventilation schemes as well as technological stopping schemes application;
• Divisional air supplying courses and windholes unsatisfactory condition.

5. WAYS OF CUL-DE-SAC VENTILATION IN NORMAL MODES

Course ventilation by means of all-mine depression

      When ventilating by means of all-mine depression, air-feeding into cul-de-sac face is carried out with the help of major airing fans working with lengthway partitions, ventilating tubing , wells and parallel courses.

      Lengthway partitions (fig. 1a) are applied when face requires essential amount of air and short course length. (<60 m).

      Cul-de-sac ventilation by means of firm ventilating tubing (fig. 1б, в) can be carried out in conjunction with partition.

Figure1. All-mine depression cul-de-sac ventilation schemes by means of lengthway partition (a), air-feeding tube (б), and exhaust tube (в).

     Ventilation by means of lengthway partitions is applied when a long course along mineral is maintained and requires essential amount of air.

Course ventilation by means of local airing fans

      When course ventilation by means of local airing fans takes place, the following ventilation methods are applied: forcing , exhaust and combined.

      Forcing ventilation method is the most wide-spread. According to the safety regulations in methane coal mines in the distance of <8m from face, and in non-methane and ore mines in the distance of <12 and <10 m corespondingly.

      The advantage of the forcing ventilation method is in good air feeding into by-facial air, which enables to ensure labor safe conditions. The disadvantage is in in-course movement of poisonous explosion gases while shooting operations.

Figure 2. Course ventilation scheme by means of forcing method using local airing fan.
Animation option: frame count=3, cycle index=6

     Exhaust ventilation method is applied in coal and ore mine, methane safe.

      The advantage of this method consists in following: recirculated air removed by tubing from by-facial area, and since the fresh air to the face by course, the most part of the course is of low gas content.

Figure 3. Course ventilation scheme by means of exhaust and forcing-exhaust method, using local airing fan.

      The combined ventilation method is more frequently applied when rapid drivage at non-gas mines takes place. It combines the advantages of the forcing and exhaust methods.

6. CUL-DE-SAC VENTILATION IN EMERGENCY MODES

     Remedial action of normal ventilation mode in cul-de-sacs in case of breakdown offers a lot of difficulties since the only possible access into emergency course is from the incoming air stream, which, as a rule is of high methane content and high temperature.

      To ensure safety and decrease the work content of piping and cul-de-sac ventilation recovery, the method, consisting in piping by means of pipeline inversion caused by excess pressure which influence pipeline butt, is applied.

7. CONCLUSION

     Refrigeratory technique application at State Enterprise “Torezantratsyt” “Progress” mine will enable to decrease temperature in a course to the level prescribed by safety rules. The description of the cul-de-sac ventilation methods in normal and emergency modes have been provided, their advantages and disadvantages have been pointed out.

8. REFERENCE LIST

1. Информация технического отдела шахты «Прогресс» ГП «Торезантрацит».

2. http://miningrocks.ru/?p=27 Приводится определение «Проветривание тупиковых выработок».

3. http://www.diclib.com/cgi-bin/d1.cgi?l=ru&base=bse&page=showid&id=57349 Значение слова «Проветривание шахты» в Большой советской энциклопедии.

4. Ушаков К.З., Бурчаков А.С., Пучков Л.А., Медведев И.И. Аэрология горных предприятий: Учебник для вузов. – 3-е изд., перераб. И доп. –М.:Недра, 1987. 420 с.

5. Правила безпеки у вугiльных шахтах. – К, 2005.-с.246-249

6. Руководство по проектированию вентиляции угольных шахт. – К.: Основа, 1991.

7. Абрамов Ф.А. Рудничная аэродинамика. –М.:Недра, 1972.

8. Бурчаков А.С., Мустель П.И. Рудничная аэрология.– М.: Недра, 1971.

9. Медведев И.И. Проветривание калийных рудников.– М.: Недра, 1970.

10. Иванов О.П., Мамченко В.О. Аэродинамика и вентиляторы. Учебник для вузов. – Л.:Машиностроение, 1986.

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