CN101967975B - Fully-mechanized caving mining process technology with large mining height in super-high seam (14-20m) - Google Patents
Fully-mechanized caving mining process technology with large mining height in super-high seam (14-20m) Download PDFInfo
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Abstract
The invention provides a coal mining method of fully-mechanized caving mining with large mining height in a super-high seam, a coal caving process, reasonable type of a support, production capacity of equipment, comprehensive control measures of coal wall spalling of working face, a technical route for improving the recovery rate of the fully-mechanized caving face with the large mining height, and feasibility evaluation indexes (thickness of the seam, top coal cavability, coal wall stability and roof pressure strength) of the fully-mechanized caving mining with the large mining height, and further forms a whole set of fully-mechanized caving mining process technology with the large mining height. The coal mining method is that the coal cutting height is 4.2-4.8m; the length of the working face is 200-280m; and the web of a coal mining machine is 0.8-1m. The process technology can increase the coal cutting quantity by 43%, shorten the coal caving time by 9%, relatively reduce the coal caving quantity by 9%, improve the resource recovery rate by 5% and reduce the mining-caving ratio to below 1:3 by increasing the coal cutting height, and can further realize the relatively balanced production of mining and caving of the working face.
Description
Technical field
The invention belongs to the coal mining technology.
Background technology
China's high seam recoverable reserves accounts for 43% of national recoverable reserves; The high seam coal production of annual underground mining accounts for 40%～50% of national coal production; Therefore, high seam realizes that safe, efficient, high-recovery exploitation has material impact to the coal in China industrial expansion.From the eighties in 20th century, China has carried out great deal of experimental to the high seam mechanized coal mining method, has progressively formed Chinese thick coal-layer mining technical system, and main coal-mining method has layering to combine to adopt, big mining and high comprehensive mining and longwall top coal caving.
1, layering combines that to adopt be high seam to be divided into several intermediate gauge (2.0～3.0m) layering is carried out longwall full-mechanized mining technique to each layering successively.Separate zone production is a mature technique; But production process is complicated, tunnelling engineering amount is big, roof control is difficult, more is prone to after disclosing repeatedly for the coal seam that is easy to get angry get angry, and cost of winning is higher; Work plane output is lower, and present this coal-mining method is eliminated basically.
2, big mining and high comprehensive mining is the comprehensive mechanization longwall system with an extraction of 3.5～6.0m high seam.The highest having reached more than 1,000 ten thousand t of big mining and high comprehensive mining work plane annual production of present domestic employing import equipment, the highest monthly output has broken through 1,000,000 t.Adopt the big mining and high comprehensive mining work plane annual production of a complete set of domestic equipment also to reach 6,000,000 t, big mining and high comprehensive mining has become the main path that safety, high-efficiency mining are realized in 3.5～6.0m coal seam.But this to adopt the method coal cutting highly big, and coal wall caving is more serious, and high to condition of coal seam occurrence, equipment dependability and stability requirement, and the maximum mining height of at present big mining and high comprehensive mining work plane is 6.0m, and 6.0m generally all adopts the longwall top coal caving mode in above coal seam.
3, longwall top coal caving is in super high seam, to arrange the coal wall along seat earth; Carry out when machine adopts at work plane; Utilize the effect of mine pressure or be aided with artificial loosening method; Crushing voerhead coal with the force piece top from support coal discharge outlet let-down, is transported the super high seam exploitation method of work plane by the rear portion drag conveyor.Longwall top coal caving possesses outstanding advantages such as output height, work efficiency is high, the excavation work amount is low, cost of production is low, has obtained large-area popularization.Through country " 95 ", " 15 " research of technique; China's longwall top coal caving technology has reached world lead level; Occurred the Lushui River peace, Yanzhou, Yangquan, big equal be main large-scale high-yield and high-efficiency mining area with the longwall top coal caving, combine under the domestic equipment condition at present and put group annual production and surpassed 6,000,000 t.Longwall top coal caving has become the main path that high-yield and high-efficiency is realized in the high seam mining area.
Compare with big mining and high comprehensive mining, the maximum coal cutting of China's fully mechanized coal face at present is highly on the low side, and maximum coal cutting highly is merely 3.5m.Receive the restriction of coal cutting height, the fully mechanized coal face equipment capability is compared with big mining and high comprehensive mining work plane has tangible gap; For super high seam, mining rate strengthens in the unit interval in addition, and absolute gas emission rate is big, and mining height is little in addition; The ventilation section is little, usually causes that face gas transfinites, and seriously restricts the fully mechanized coal face safety and high efficiency; For super high seam, the taking and placing proportional imbalance is serious, is unfavorable for high yield.
Summary of the invention
The objective of the invention is to use for reference the characteristics of big mining and high comprehensive mining technology and longwall top coal caving technology; The coal-mining method of the big mining height longwall top coal caving of super high seam is proposed; Existing taking and placing proportional imbalance is serious in the super high seam exploitation, face gas transfinites to solve, work plane is pressed technical barriers such as frame, further improves the technical level of China's this type coal seam longwall top coal caving.But this coal-mining method simple defining is the work plane coal cutting highly is the longwall top coal caving of 3.5～5.0m.
Technical barrier 1: the taking and placing proportional imbalance is serious.Former in 14～20 meters thick super high seams, about 3.5 meters of maximum mining heights, taking and placing were brought up to 4.5～5m with mining height through the present invention than 1: 3～1: 5 from about 3.5 meters, the taking and placing ratio was reduced to 1: 3, solved the taking and placing ratio problem that exceeds standard.
Technical barrier 2: face gas transfinites.The present invention increases to 4.5～5.0 meters with mining height from 3.0～3.5 meters, and the ventilation section is from 17.6～20.5 meters
2Increase to 26.5～29.4 meters
2, can be with gas density from being reduced to 0.3～0.7% more than 1%, solve the face gas problem that transfinites.
Technical barrier 3: face roof damages support by pressure.Former bracket support intensity is lower, and general 1.05～1.24MPa can bring work plane to press the frame problem, and ZF15000/28/52 support of the present invention has strengthened supporting intensity to 1.41MPa, and greatly a frame difficult problem is pressed in improvement or elimination.
Technical scheme of the present invention
(1) work plane parameter optimization and technical study
The work plane parameter refers to work plane coal cutting height, length, it is dark etc. to cut.Technology mainly refers to drawing coal technology.
The work plane parameter optimization method:
Utilization FLAC
3DCarry out the macromechanics of work plane different parameters (coal cutting height, length, cut dark etc.) and calculate, the putting property of emitting that manifests rule, top coal is pressed in the ore deposit under the research different parameters condition, thereby confirms rational work plane parameter.
Rib and face stability adopt physical analogy and PFC during utilization 3DEC analog computation work plane difference coal cuttings height
3DThe prose style free from parallelism top-coal caving law of the different taking and placing ratios of Numerical Method Study, thus draw the reasonable coal cutting height of big mining height fully mechanized coal face.
Coal cutting rationally highly is 4.2～4.8 meters; Face length is 200～280 meters; It is 0.8～1 meter that coal-winning machine cuts dark.
Work plane process optimization method:
Adopt physical analogy and numerical simulation calculation, study top coal under the different drawing coal technologies conditions such as (drawing interval, caving modes) and emit and put rule, thereby confirm rational drawing coal technology.
Reasonably drawing coal technology is: drawing interval is to adopt one to put; Caving mode is that 2 people 2 take turns order and put coal.
Carry out type approval test, adopt field measurement method validation work plane parameter and the reasonability of combining the skill of knocking off, the step of going forward side by side carries out the work plane parameter and puts Study of optimization with combining.
(2) lectotype selection is supporting
Method:
Adopt theory analysis, study the reasonable frame type of big mining height synthetical support; According to support and country rock interaction principle, adopt FLAC
3DCarry out working resistance of support and calculate, and combining with theoretical analysis, the corresponding Computational Mechanics model of bracket support resistance and strata structure set up.
The reasonable frame type of the big mining height synthetical support of Datong District's super high seam is a four post support shield type, and support maximum support height reaches 5.2 meters, is the highest sublevel caving hydrau lic support in the present world, and the reasonable working resistance of support is 14500～16500KN.Support adopts constant-impedance to impact column, and adopts new type double four connecting rod formula of large space sublevel caving hydrau lic support stabilizing mechanisms, has kept spacious pedestrian space between front-rear linkage, make things convenient for personal security through with the observation and the control of the rear portion being put coal.
Adopt actual measurement and return statistical method; Set up the science computational methods of cover work plane capital equipment (front and back drag conveyor, coal-winning machine, elevating conveyor, crushing engine, crossheading belt conveyer etc.) production capacity and device parameter, for big mining height fully mechanized coal face lectotype selection provides foundation.
Equipment capacity is: coal-winning machine 2000t/h, preceding transporter 2500t/h, back transporter 3000t/h, elevating conveyor 3500t/h, crushing engine 4250t/h, adhesive tape conveyor 3500t/h.
Device parameter (power) is: coal-winning machine 1915KW, preceding transporter 2 * 855KW, back transporter 2 * 1000KW, elevating conveyor 450KW, crushing engine 400KW, adhesive tape conveyor 3 * 500KW.Supply voltage is all selected 3300V for use.
(3) type approval test
1. top coal, the research of roof movement rule
In the special observation lane of work plane driving; With rig boring top coal top board migration path is installed and is followed the tracks of wave detector; Adopt top coal top board migration path tracker that top coal top board is carried out the three-dimensional motion actual measurement, research top coal top board space-time migration rule (horizontal movement, vertical displacement, tendency displacement and time dependent migration rule).
Adopt the micro seismic monitoring navigation system to monitor the stope overlying strata in real time and break, the research trends destructive characteristics realizes the prediction to the top board rupture location.
2. observation is pressed in the ore deposit
The amount of contracting, work plane and two lane roof to floor convergence, roof of head face situation, wall caving situation etc. under the change procedure situation of field observation force piece resistance, the support post alive.
3. technology observation
The different drawing coal technology (cutter one is put, two cuttves one are put etc.) of field observation is to the influence of top-coal recovery rate.
4. wall caving control
Method:
The coal wall caving rule is carried out numerical simulation study.Main contents are:
Stope country rock mechanical characteristics and coal wall caving rule were confirmed suitable fltting speed when 1) different propellings were spent.
2) stope country rock mechanical characteristics and coal wall caving rule during different tip to face distance are confirmed rational tip to face distance.
Study big mining height fully mechanized coal face roof Control Technology and coal wall caving Prevention Technique.
Adopt the field measurement method, the coal wall caving degree of depth, area etc. are observed.
Propose the comprehensive preventive health measures of big mining height fully mechanized coal face coal wall caving, improve coal wall caving mechanism theory and coal wall caving Prevention Technique.
1) fltting speed to be to be advisable greater than 5～6 meters/day, reduces rib open-assembly time, to reduce the coal wall caving degree.
2) strict control end identity distance in time stretches out front-axle beam within 300mm, gets face guard, tries to stop people from fighting each other in advance in case of necessity.The worker that tries to stop people from fighting each other requires to chase after machine and tries to stop people from fighting each other a cylinder 3-5 frame on the hysteresis unit.
3) strict workmanship.Work plane must be adopted and directly cut flatly, does not stay the umbrella eaves; Float coal on the back timber is in time cleared up, and improves the effective support area of support.
When 4) coal wall caving is serious, can reinforce (measures such as rib wood bolt, leading water filling) control coal wall caving to rib.
5. improve rate of recovery technology
Method:
Adopt the analytic method theoretical research to reduce that big mining height longwall top coal caving is just adopted, the method for work plane coal recovery rate when adopt at the end.
Adopt FLAC
3DLeading stress distribution law during adopt at the numerical simulation study end, and the rational work plane of binding isotherm Calculation and Study do not put coal length, reduces the end and adopts loss.
The technological approaches of the big mining height fully mechanized coal face of a series of raisings rate of recovery is proposed.
Adopt artificial auxiliary cut a kerve improve just adopt during the top coal rate of extraction; Reasonably work plane stops adopting that not put coal length be 40 meters～50 meters;
(4) analyze the ore deposit and press, optimize technology
On the basis of test, the big mining height of binding isotherm analysis-by-synthesis is combined top coal, the roof movement rule of putting at the scene, optimizes drawing coal technology, improves the rate of recovery.
(5) big mining height longwall top coal caving Adaptability Evaluation software development
Adopt the method for numerical simulation, theory analysis, fuzzy clustering and step analysis; The big mining height of research influence combine put rib stability, the top coal emits putting property, big mining height to combine and put safe principal element, confirms big mining height longwall top coal caving feasibility assessment index and suitable condition.
Adopt the VB programming platform; Research and develop big mining height longwall top coal caving Adaptability Evaluation system software; To realize input coal seam and wall rock condition and the principal element that influences big mining height longwall top coal caving, can estimate out big mining height and combine and put the compliance grade (as: A level-compliance is fine, can adopt big mining height to combine and put; B level-compliance is better, and the big mining height of suggestion employing is combined and put; C level-compliance is general, takes certain measure can adopt big mining height to combine and puts; D level-compliance is relatively poor, and other exploitation method is adopted in suggestion).
Big mining height longwall top coal caving feasibility assessment index is that coal seam thickness, top coal emit putting property, rib stability, weighting strength.
The condition of being fit to: 14～20 meters of coal seam thicknesses; The top coal emits putting property, rib stability all to adopt comprehensive evaluation index, and concrete index boundary is respectively 1.2,1.3; Weighting strength is＜2.0.
(6) after above research work is all accomplished, with forming a complete set of big mining height longwall top coal caving technology
A, rational work plane parameter (work plane coal cutting height, face length, coal-winning machine cut dark), reasonably drawing coal technology (drawing interval, caving mode).
B, be a whole set of working face equipment (front and back drag conveyor, coal-winning machine, elevating conveyor, crushing engine, the crossheading belt conveyer etc.) supporting technology of key equipment with the hydraulic support.
C, super high seam top coal, roof movement rule.
D, skin group's Prevention Technique and raising top-coal recovery rate technology.
E, big mining height longwall top coal caving Adaptability Evaluation software.
Concrete technical scheme of the present invention in a word does
A kind of coal-mining method of longwall top coal caving; Its technological process comprises: coal cutting, move frame, move anterior conveyer, Caving Coal, the operating type that moves the rear portion conveyer, take a cutter one to put, it is characterized in that: proposing the reasonable frame type of coal-mining method, drawing coal technology, support, equipment capacity, the working face wall wall caving comprehensive preventive health measures Prevention Technique of the big mining height longwall top coal caving of super high seam, the technological approaches that improves the big mining height fully mechanized coal face rate of recovery, big mining height longwall top coal caving feasibility assessment index is that coal seam thickness, top coal emit putting property, rib stability, weighting strength; Form a complete set of big mining height longwall top coal caving technology.
The coal-mining method of described longwall top coal caving, the coal-mining method that it is characterized in that the big mining height longwall top coal caving of super high seam are that coal cutting highly is 4.2～4.8 meters; Face length is 200～280 meters; It is 0.8～1 meter that coal-winning machine cuts dark.
The coal-mining method of described longwall top coal caving is characterized in that drawing coal technology is: drawing interval is to adopt one to put; Caving mode is that 2 people 2 take turns order and put coal.
The coal-mining method of described longwall top coal caving is characterized in that the reasonable frame type of the big mining height synthetical support of super high seam is a four post support shield type, and support maximum support height reaches 5.2 meters, and the reasonable working resistance of support is 14500～16500KN; Support adopts constant-impedance to impact column, and adopts new type double four connecting rod formula of large space sublevel caving hydrau lic support stabilizing mechanisms, has kept spacious pedestrian space between front-rear linkage, make things convenient for personal security through with the observation and the control of the rear portion being put coal.
The coal-mining method of described longwall top coal caving is characterized in that equipment capacity is: coal-winning machine 2000t/h, preceding transporter 2500t/h, back transporter 3000t/h, elevating conveyor 3500t/h, crushing engine 4250t/h, adhesive tape conveyor 3500t/h; Device parameter (power) is: coal-winning machine 1915KW, and preceding transporter 2 * 855KW, back transporter 2 * 1000KW, elevating conveyor 450KW, crushing engine 400KW, adhesive tape conveyor 3 * 500KW, supply voltage all select 3300V for use.
The coal-mining method of described longwall top coal caving is characterized in that the comprehensive preventive health measures of big mining height fully mechanized coal face coal wall caving:
1) fltting speed to be to be advisable greater than 5～6 meters/day, reduces rib open-assembly time, to reduce the coal wall caving degree;
2) strict control end identity distance in time stretches out front-axle beam within 300mm, gets face guard, tries to stop people from fighting each other in advance in case of necessity; The worker that tries to stop people from fighting each other requires to chase after machine and tries to stop people from fighting each other a cylinder 3-5 frame on the hysteresis unit.
3) strict workmanship.Work plane must be adopted and directly cut flatly, does not stay the umbrella eaves; Float coal on the back timber is in time cleared up, and improves the effective support area of support;
When 4) coal wall caving is serious, can reinforce (measures such as rib wood bolt, leading water filling) control coal wall caving to rib;
The coal-mining method of described longwall top coal caving is characterized in that proposing to improve the technological approaches of the big mining height fully mechanized coal face rate of recovery: adopt artificial auxiliary cut a kerve improve just adopt during the top coal rate of extraction; Reasonably work plane stops adopting that not put coal length be 40 meters～50 meters.
The coal-mining method of described longwall top coal caving is characterized in that big mining height longwall top coal caving feasibility assessment index is that coal seam thickness, top coal emit putting property, rib stability, weighting strength; The condition of being fit to: 14～20 meters of coal seam thicknesses; The top coal emits putting property, rib stability all to adopt comprehensive evaluation index, and concrete index boundary is respectively 1.2,1.3; Weighting strength is＜2.0.
Beneficial effect:
Because the increasing of coal cutting height, caving coal height is corresponding to be reduced, and compares with former longwall top coal caving, and following advantage is arranged: 1. optimized the taking and placing ratio, made it to be reduced to 1: 3 from 1: 3～1: 5, met the regulation of " safety regulations in coal mine "; 2. through strengthening the coal cutting height, increase coal cutting amount 29%～43%, shortened top coal caving time 6～9%, reduced to put coal amount 6～9% relatively, can improve single face output level 2500～3000 ton per days, can realize the balanced production that the work plane taking and placing are relative; 3. owing to use the ZF15000/28/52 support, the supporting intensity of support is up to 1.41MPa, and the supporting intensity of 1.05～1.24MPa of support was greatly improved more in the past, had solved a pressure frame difficult problem; 4. owing to use the ZF15000/28/52 support setting load up to 12778KN; The setting load of the 10096KN of ZF13000/25/38 support more in the past improves a lot; The interaction force of support and top coal is increased greatly; Increase the broken coal effect of stope mine pressure, helped improving the top coal and emit putting property, improved top-coal recovery rate; 5. strengthen the support rear portion and put the coal space, can arrange high-power transporter, helped putting fast coal; 6. strengthened the face-airing section, mining height is increased to 4.5～5.0 meters from 3.0～3.5 meters, the ventilation section is from 17.6～20.5 meters
2Increase to 26.5～29.4 meters
2, help the dilution of gas, can be with gas density from being reduced to 0.3～0.7% more than 1%, solved the face gas problem that transfinites.
Big mining height longwall top coal caving can further improve single face output 6～10% and resource recovery 5～10%; Having reduced taking and placing compares below 1: 3; Eliminated the hidden danger of the gas exceeding limit of work plane, to realize super high seam safety, efficient, the high-recovery exploitation is significant
The specific embodiment
This project is with 8105 uses in ore deposit, the coal group Tashan Mountain, and with 8106 in ore deposit, the coal group Tashan Mountain, 8107,8108 uses.
This project is being promoted the use of with Xin ore deposit 8106,8107 faces, and is promoting the use of with ore deposits such as the new well Ma Jialiang of coal group, same Eastern Zhou Dynasty's kilns.
1 project of embodiment is with 8105 uses in ore deposit, the coal group Tashan Mountain
The coal-mining method of the big mining height longwall top coal caving of super high seam is 4.8 meters of coal cutting height; Face length is 207 meters; It is 0.8 meter that coal-winning machine cuts dark.
Drawing coal technology is: drawing interval is to adopt one to put; Caving mode is that 2 people 2 take turns order and put coal.
The reasonable frame type of the big mining height synthetical support of super high seam is a four post support shield type, and support maximum support height reaches 5.2 meters, and working resistance of support is 15000KN; Support adopts constant-impedance to impact column, and adopts new type double four connecting rod formula of large space sublevel caving hydrau lic support stabilizing mechanisms, has kept spacious pedestrian space between front-rear linkage.
Equipment capacity is: coal-winning machine 2000t/h, preceding transporter 2500t/h, back transporter 3000t/h, elevating conveyor 3500t/h, crushing engine 4250t/h, adhesive tape conveyor 3500t/h;
Big mining height fully mechanized coal face coal wall caving comprehensive preventive health measures:
1) fltting speed is greater than 5 meters/day, reduces rib open-assembly time, to reduce the coal wall caving degree;
2) strict control end identity distance in time stretches out front-axle beam within 300mm, gets face guard;
Improve the technological approaches of the big mining height fully mechanized coal face rate of recovery: adopt artificial auxiliary cut a kerve improve just adopt during the top coal rate of extraction; Work plane stops adopting that not put coal length be 40 meters.
Big mining height longwall top coal caving feasibility assessment index is that coal seam thickness, top coal emit putting property, rib stability, weighting strength; The condition of being fit to: 20 meters of coal seam thicknesses; The top coal emits putting property, rib stability all to adopt comprehensive evaluation index to be respectively 1.2,1.3; Weighting strength is＜2.0.
Through strengthening the coal cutting height, increased coal cutting amount 43%, shortened top coal caving time 9%; Reduced to put coal amount 9% relatively; Can improve single face output level 2500 ton per days, can realize the balanced production that the work plane taking and placing are relative, improve single face output 6% and resource recovery 5%.
Embodiment 2 is with 8106 in ore deposit, the coal group Tashan Mountain, 8107
The coal-mining method of the big mining height longwall top coal caving of super high seam is that coal cutting highly is 4.2 meters; Face length is 250 meters; It is 1 meter that coal-winning machine cuts dark.
Drawing coal technology is: drawing interval is to adopt one to put; Caving mode is that 2 people 2 take turns order and put coal.
The reasonable frame type of the big mining height synthetical support of super high seam is a four post support shield type, and support maximum support height reaches 5.2 meters, and working resistance of support is 15000KN; Support adopts constant-impedance to impact column, and adopts new type double four connecting rod formula of large space sublevel caving hydrau lic support stabilizing mechanisms, has kept spacious pedestrian space between front-rear linkage.
Equipment capacity is: coal-winning machine 2000t/h, preceding transporter 2500t/h, back transporter 3000t/h, elevating conveyor 3500t/h, crushing engine 4250t/h, adhesive tape conveyor 3500t/h;
Big mining height fully mechanized coal face coal wall caving comprehensive preventive health measures:
1) fltting speed is greater than 6 meters/day, reduces rib open-assembly time, to reduce the coal wall caving degree;
2) strict control end identity distance in time stretches out front-axle beam within 300mm, gets face guard;
Improve the technological approaches of the big mining height fully mechanized coal face rate of recovery: adopt artificial auxiliary cut a kerve improve just adopt during the top coal rate of extraction; Work plane stops adopting that not put coal length be 50 meters.
Big mining height longwall top coal caving feasibility assessment index is that coal seam thickness, top coal emit putting property, rib stability, weighting strength; The condition of being fit to: 18 meters of coal seam thicknesses; The top coal emits putting property, rib stability all to adopt comprehensive evaluation index to be respectively 1.2,1.3; Weighting strength is＜2.0.
Through strengthening the coal cutting height, increased coal cutting amount 29%, shortened top coal caving time 6%, reduced to put coal amount 6% relatively, can improve single face output level 3000 ton per days, can realize the balanced production that the work plane taking and placing are relative.
Embodiment 3 is with 8108 uses in ore deposit, the coal group Tashan Mountain.
The coal-mining method of the big mining height longwall top coal caving of super high seam is that coal cutting highly is 4.5 meters; Face length is 280 meters; It is 1 meter that coal-winning machine cuts dark.
Drawing coal technology is: drawing interval is to adopt one to put; Caving mode is that 2 people 2 take turns order and put coal.
The reasonable frame type of the big mining height synthetical support of super high seam is a four post support shield type, and support maximum support height reaches 5.2 meters, and working resistance of support is 16500KN; Support adopts constant-impedance to impact column, and adopts new type double four connecting rod formula of large space sublevel caving hydrau lic support stabilizing mechanisms, has kept spacious pedestrian space between front-rear linkage.
Equipment capacity is: coal-winning machine 2000t/h, preceding transporter 2500t/h, back transporter 3000t/h, elevating conveyor 3500t/h, crushing engine 4250t/h, adhesive tape conveyor 3500t/h;
Big mining height fully mechanized coal face coal wall caving comprehensive preventive health measures:
1) fltting speed is greater than 6 meters/day, reduces rib open-assembly time, to reduce the coal wall caving degree;
2) strict control end identity distance in time stretches out front-axle beam within 300mm, gets face guard;
Improve the technological approaches of the big mining height fully mechanized coal face rate of recovery: adopt artificial auxiliary cut a kerve improve just adopt during the top coal rate of extraction; Work plane stops adopting that not put coal length be 40 meters.
Big mining height longwall top coal caving feasibility assessment index is that coal seam thickness, top coal emit putting property, rib stability, weighting strength; The condition of being fit to: 14 meters of coal seam thicknesses; The top coal emits putting property, rib stability all to adopt comprehensive evaluation index to be respectively 1.2,1.3; Weighting strength is＜2.0.
Through strengthening the coal cutting height, increased coal cutting amount 35%, shortened top coal caving time 7%, reduced to put coal amount 7% relatively, can improve single face output level 2800 ton per days, can realize the balanced production that the work plane taking and placing are relative.
Claims (1)
1. the coal-mining method of a longwall top coal caving, its technological process comprises: coal cutting, move frame, move anterior conveyer, Caving Coal, move the rear portion conveyer; The operating type of taking a cutter one to put is characterized in that: the technological approaches of the reasonable frame type of coal-mining method, drawing coal technology, support of the big mining height longwall top coal caving of proposition super high seam, equipment capacity, working face wall wall caving comprehensive preventive health measures Prevention Technique, the big mining height fully mechanized coal face rate of recovery of raising; Big mining height longwall top coal caving feasibility assessment index is that coal seam thickness, top coal emit putting property, rib stability, weighting strength; Form a complete set of big mining height longwall top coal caving technology;
The coal-mining method of the big mining height longwall top coal caving of super high seam is that coal cutting highly is that 4.2～4.8m, face length are that 200～280m, coal-winning machine cut the dark 0.8～1m of being;
Drawing coal technology is: drawing interval is to adopt one to put, and caving mode is that 2 people 2 take turns order and put coal;
The reasonable frame type of the big mining height synthetical support of super high seam is a four post support shield type; Support maximum support height reaches 5.2m; The reasonable working resistance of support is 14500～16500KN, and support adopts constant-impedance to impact column, and adopts new type double four connecting rod formula of large space sublevel caving hydrau lic support stabilizing mechanisms; Kept spacious pedestrian space between front-rear linkage, make things convenient for personal security through with the observation and the control of the rear portion being put coal;
Equipment capacity is: coal-winning machine 2000t/h, preceding transporter 2500t/h, back transporter 3000t/h, elevating conveyor 3500t/h, crushing engine 4250t/h, adhesive tape conveyor 3500t/h; Device parameter power is: coal-winning machine 1915KW, and preceding transporter 2 * 855KW, back transporter 2 * 1000KW, elevating conveyor 450KW, crushing engine 400KW, adhesive tape conveyor 3 * 500KW, supply voltage all select 3300V for use;
Big mining height fully mechanized coal face coal wall caving comprehensive preventive health measures: 1. fltting speed to be to be advisable greater than 5～6m/ days, reduces rib open-assembly time, to reduce the coal wall caving degree; 2. strict control end identity distance in time stretches out front-axle beam within 300mm, get face guard, draws support in case of necessity in advance; Draw the timberer to require to chase after machine and draw support, draw 3～5 supports of cylinder on the support hysteresis unit; 3. strict workmanship, work plane must be adopted and directly cut flatly, do not stay the umbrella eaves, and the float coal on the back timber is in time cleared up, and improve the effective support area of support; When 4. coal wall caving is serious, rib is reinforced the control coal wall caving;
Improve the technological approaches of the big mining height fully mechanized coal face rate of recovery: adopt artificial auxiliary cut a kerve improve just adopt during the top coal rate of extraction, reasonably work plane stops adopting that not put coal length be 40m～50m;
Big mining height longwall top coal caving feasibility assessment index is that coal seam thickness, top coal emit putting property, rib stability, weighting strength; The condition of being fit to: coal seam thickness 14～20m, top coal emit putting property, rib stability all to adopt comprehensive evaluation index, and concrete index boundary is respectively 1.2,1.3, and weighting strength is＜2.0.
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