The gas-steam combined cycle power plant of Shanxi Daning uses the underground coal mine methane (CMM) as the fuel, employs gas-combustion engine and waste-heat boiler with steam turbine as the major equipment to produce the power with total output of 35 MW capacity. It is the first gas-steam combined cycle power plant in the world equipped with the biggest single engine and perfect power generation facility. It presents the features of advanced equipment, high degree of automation and good operation performance. The paper introduces the process and operation of the power plant and summarizes the experience on designing as reference for the craft brothers to reach a better level of CMM power generation designing.

In this paper, the existed endless rope winch calculation method can not imply satisfactory results in the ups and downs and turning many of the roadways, the segment selection calculation method is proposed. Using this method which given full consideration to the environmental impact of slope changes and roadway turning terrain, the accuracy of running resistance selection calculation is improved, the selection of equipment is more scientific, and the running reliability of complex roadway endless rope winch is improved.

The foreground and background mode of microprocessor fault recorder is widely used in the mine Cole, but it exits easy to crash, data loss and not network faults. A kind of distributed electric power system fault recorder for coal mine based on DSP+ARM is presented, the recorder can be distributed in each substation, has run stability, reliability, reasonable allocation of hardware, strong communication capability and small volume advantages.

The coal bed methane extraction, recycling and scientific use is the important measure of coal enterprise safe production as well as energy saving and emission reduction. The feasibility of comprehensive utilization of coal bed methane in Sdic Xinji Energy Company Limited was researched. The study shows the coal bed methane is rich, suitable for large-scale pumping, and uses them. At the same time that, Xinji No.1 Coal Mine and Xinji No.2 Coal Mine shares a gas tank, concentrates outward supply more economic and reasonable, and conforms to the present actual situation.

This article based on the high-stress complex geological structure with the combined support technology of steel mesh and anchor and hinged beam and single hydraulic prop to conduct research.. Research methods include theoretical analysis and on-site monitoring. To give a successfully achieve of the large cross-section cut eye's supporting under the conditions of high-stress complex geological structure. The study has a certain practical value.

To explore simultaneous drifting construction technology of fully mechanized large section open-off cut, contraposed specific situation of 4502 open-off cut in Huating Xinyao mine , based on the theory analysis and numerical simulation, Determined the case that open-off cut used simultaneous drifting scheme on Leading guide adit, simultaneously, confirmed anchor combined support network scheme and supporting parameters. Mine pressure detection results show that: it was success that 4502 open-off cut eye using simultaneous drifting construction technology of fully mechanized large section open-off cut, and it maked speedy drivage of roadway come true, achieved the whole section once safety construction into the lane

Aiming at the roof control and removing passage stability and safety and other questions in the process of removing of large scale equipment in fully mechanized face, according to the geological and mining conditions in No.131108 fully mechanized face of No.2 Xinji Mine, three schemes are put forward, and after comprehensive economic and technological comparison, the best scheme we choose is as follows: brush expansion of cut-hole and auxiliary partial arrangement of safety chamber are used for the removing passage; other safe and effective measures are made to ensure the removing of conveyor and hydraulic support safety；after removing of the support，the wood crib and Point Pillar are used to support the roof on time，and protect the space for removing，prevent roof above the support caving. The industry research indicated that the implementation of scheme ensures removing of large scale equipment in No.131108 fully mechanized face safely，effectively and quickly，and has been achieved satisfactory technical and economical benefits.

To improve the method of coal and gas outburst heading face driving speed , using the roadway alternately boring , the ears drilling field roadway on both sides of the construction , the construction of one thousand meters rigs pass next face pre- pumping as much as possible to reduce gas factors on Driving constraints , thereby improving the driving speed . This article details methods the Sihe mine taken to improve the driving speed , the site practical applications show good result .

As the research of kailuan mining area high drilling gas extraction technology, this paper to domestic and international high drilling drainage method analysis of the current situation. And so in kailuan mining area on the selected face high drilling extraction practice.The drainage and face the key place of gas concentration change, verified the feasibility of high drilling. The optimization of the final hole point highly advanced drainage horizontal distance drill field spacing parameters. The results show that high drilling parameter optimization can effectively prevent the gas from the workface. The results of the study of kailuan mining area to the improvement of the gas extraction technology, improve the rate of gas extraction has very important significance.

For fine coal slime recovery system of Nantun Coal Preparation Plant，aging equipment causes the processing ability to drop somewhat, high failure rate, at the same time, Nantun coal quality variation is relatively large, resulting in fine coal slime recovery system can not meet the requirement of production, press slime production is too high, the product structure is extremely unreasonable. So it is necessary to existing fine coal slime recovery technology retrofit optimization, increase plant fine slime recovery, optimize the product structure, increase the mine and the company benefits.

In order to prevent gas concentration exceeding limits at the upper corner of 2103 working face of ChangCun coal mine, based on the “O” circle theory and the fracture development laws of the depressing zones overlying a goaf, the high level gas suction roadway was excavated in the roof to extract gob gas. Theoretical calculation and numerical simulation method have been applied to analyze and predict the fracture development laws of the depressing zones overlying a goaf, and the main fracture zones has been determined as 22.9～36.6m. By testing the changed relationship between gas extraction pure quantity of single hole and working face advance on the site, the main fracture zones was 22.9～36.6m. The results of theoretical calculation and numerical simulation was proved. Aimed at preventing the roadway damaged, the safety height was chose as 1.5 times mining height and the layer of high level gas suction roadway was designed as 31.5～36.6m.

In order to ensure Wongawilli mining technology imported by Shendong minning area to achieve safe and efficient production effects, and improve the coal recovery rate, mining pressure law monitoring was taken in different mining technology faces in same area in the Daliuta coal mine. Mine pressure monitoring data comparative analysis shows that, Lane roadway pillars leaving in 10m is to be able to ensure the safety of the isolation; Coal Pillar between sumpings is designed 0.5m to play a role of supporting continuous mining machine to cut coal and load coal and can not play the role of supporting the overlying strata; the 2.0m thickness coal pillar between branch lanes plays a supporting roof . The test mining area breakthroughs company provision and the recovery rate is increased of 12.3%, reform of Wongawilli mining process is successful.

Abstract: Based on the factors which influence the surrounding rock stability of the deep high-stress weak rocks cavern, we proposed the reinforcement concept of the deep high-stress weak rock.The high prestress constant resistance to high surrounding rock pressure yieldable support technology and step-by-step coupling grouting technology have been composition applied. The measured results show that the displacement shrinkage of the the cavern group’s surrounding rocks’ sidewalls, roof and floor each reduce to 82.5%、25%and 88.9%, after the application of the design proposal.

Using the comprehensive mechanized driving technology is considered the main route of rapid coal roadway driving. In order to improve the driving speed and mechanization level of large cross section seam roadway under complicated geological conditions, the various factors were discussed mainly in Linnancang Coal Mine. With the numerical simulation (FLAC3D), the paper analyzes the roadway surrounding rock stress field and displacement distribution characteristics in the wake of different driving footage. Influence of different supporting parameters on the driving speed was analyzed. Connected with the practical construction, the paper objectively advances the technical measures to realize rapid excavation: advance cutting rapidly, support parameters reasonably, auxiliary transportation continuously and the optimal allocation between them. By taking the above technical measures, the rapid excavation of No.2220 heading face in Linnancang coal mine is realized.

Abstract：To research the crack development regularity and “three zones” distribution of 15 # coal seam hard roof ,this paper applied theory calculation, numerical simulation and drilling peep methods field detecting. Through the research of 15 # coal seam “three zones” distribution,it concluded 15 # coal seam fracture zone maximum growth altitude. According to crack development hole gas concentration distribution and the situation on roof lithology. The research divided “three zones” height and provided the basis feasibility and rationality of 15 # coal gas drainage system establishment. Based on Gushuyuan mine 15 # coal seam gas migration rule fracture zones, the “high roof drilling drainage, goaf buried tube extraction” as the core of the three-dimensional comprehensive drainage technology was formed.

The prediction of amount from the gas emission is an important factor in Preliminary design for coal mining, which will play an active role in gas control, ventilation, drainage of gas for coal mining. By way of prediction of unique source for the prediction of amount from the gas emission in coal mining for short distance seam, the result of the prediction of amount from the gas emission for short distance seam differ largely when the seam gas geological is covered under similar conditions .The study shows that adjacent seam gas drainage rate is a major influential factor for the large difference of the result of the prediction of amount from the gas emission for short distance seam.

In order to quantitatively and comprehensively evaluation on the safety of rock drivage, the index system for rock drivage safety evaluation is set up. Based on Analytic Hierarchy Process, weighting and ranking standard of indexes are determined, sample matrix of evaluation is obtained, a comprehensive safety evaluation model for rock drivage is established. According to the model, the safety of rock drivage in Hui Po Di mine is evaluated. The evaluation results conform with actual conditions. Results of comprehensive safety evaluation can provide scientific basis for mine to draw up safety precautions and prevention measures during rock drivage.

According to the fault water inrush of Zhangcun mine, the distribution of faults in the mine is analyzed. Based on the distance discriminant analysis method, the water inrush grades of the main effect faults in Zhangcun mine are discriminated. The results show that the taiyuan formation limestone aquifer causes fault water inrush more easily than the Cambrian limestone aquifer does because the thickness of aquifuge between the coal seam and the taiyuan formation limestone aquifer is less than the mining failure thickness of floor. In addition, the larger the fault displacement is, the bigger the water inrush quantity will be in high water pressure. Because the large displacement fault will cut to the Cambrian limestone aquifer, and its water abundance is more stronger than others. The analysis results also consistent to the real condition and the transient electromagnetic exploration results in Zhangcun mine. According to the research results, the prevention measures of fault water inrush are proposed, which have some guiding significance to ensure the safe production of the mine.

Gas outburst of coal mine is the most important element in safe exploitation, which threats the security of lots of collieries and the property of country and people. The geological factors which influence the gas outburst most is geological structure, coal seam and wall rock characteristics, hydrological geology and so on. This paper analyzes systemically and profoundly the specific influence of the geological factors which include geological structure. and it turns out that the most important factor is geological structure, especially the fault structure, which exists broadly in collieries, and is the most important factor in gas outburst. Then are the coal seam and wall rock characteristics, and the thickness and buried depth has great influence in it. Hydrological geology is the weakest factor, it can’t make it happen by itself. Based on these analyses, these will provide help for the precaution of gas outburst in future.

Abstract: Based on explicit dynamics software to simulate the thin seam coal shearer drum breaking coal process, got the coal-rock plastic zone dynamic changes and the load spectrum of picks on the drum, which could avoid the human errors in the parameter values and provide a theoretical basis for the spiral drum design, use and maintenance. The results show that: the behavior of drum breaking coal is not continuous, but the accumulation of damage energy, the large number of coal-rock instant broken periodic alternating process; The load of picks in the same line on the drum was not significantly related, the drum should adopt the small distance arrangement of one line by one pick.

Abstract:By means of differential scanning calorimeter (DSC),the activation energy of coal oxidation at low temperature is learned.The coal samples are sieved into coal powder in particle size of 0.076~0.18mm, 0.18~0.30mm, 0.30~0.56mm.The reactions process at different heating rates and in the circumstance of nitrogen, oxygen concentration of air supply at ratio of 4:1.The trend of different kinds of coal's activation energy is attained from the experiment,and their activation energy values are calculated.A scientific and effective index is provided for dividing the spontaneous combustion tendentiousness of coal.

This paper on the zhejiang shangtang bridge engineering of the cast-in-place pile static load tests and grouting pile load the contrast analysis，And through the and single pile load contrast analysis, finite element model parameters determined ANSYS, For grouting pile, respectively not grouting pile of grouting body size under different conditions of the size of the bearing capacity of the comparison and analysis, And that bored perfusion pile on the bearing capacity of the essence improve after grouting is the transformation of the failure mode.

Abstract： In this paper, combining with a standard intermediate crane beam for industrial plants, the 3-D finite element model of the crane beam was built by using ANSYS software. First six eigenvalues and buckling modes were deduced by Block Lanczos method, and the capacity of bearing and economic differences of two kinds of crane girders in crane loads were illustrated by comparing the buckling eigenvalues, maximum displacement and buckling mode.

54 massive colliery blasting accidents from 1980 to 2011 were analyzed statistically with regard to the unsafe act of blasters, finding 7 categories (22species) unsafe blasting act. It is found that two reasons resulting in the unsafe act through the further analyse : one is ordered as unsafe habit, lack of safety knowledge and safety awareness of blasters ; The other is get on bad with the blasting monitoring. On this basis, a graded safety training was used to enrich the safety knowledge, increase the safety awareness and improve the safety habit of the blasters; Remote blasting monitoring is used to monitor and improve the blasting operation of blasters.

In order to ensure the safety of mine hoist used, and protect the safety of the mine staff and the normal operation of coal mining, a new device detecting tension stress of wire rope for mine hoist was designed. The device making full use of the hydraulic integration obtained the tension stress of wire rope through the detection and calculation. The design work mainly included four parts. Firstly, the work was select the wire rope; Secondly, it analyzed the principle of tension stress of wire rope; Thirdly, the device detecting tension stress of wire rope was designed; Finally, the hydraulic oil and a hydraulic sensor with its signal processing was analyzed.

ZDY1000G type all hydraulic drilling rig has the ability to drill exploration borehole of 500 meters for tunnel drilling in coalmine, it can meet the demand of drilling coring and line coring, it can be used as an ideal drilling rig for deep resource exploration for resource exhausted mines in coal mines and other metal mines. In this paper, parameters of construction and performance were introduced; applications in Taibai gold mine in Shaanxi and Daanshan coalmine in Beijing were descripted in detailed.

Abstract: Tilt transport belt conveyor, once produce fault belt, will cause serious harm, To the safety of coal production the reasonable design and application of fault belt catch device, provides a powerful guarantee, This article simply introduces the structure and working principle of break belt catch device, And the matters of design and application needing attention of this device’s are introduced.

This paper analyzed the shortcomings existing coal mine production scheduling management system. Based on the B/S structure desin ideas,the framework of system was designed. According to the structure of modular design method,completed the system function modular,network topology structure,database,authority management was designed and introduced the system software platform. The system provides an important technical support for the coal mine enterprise’s production management.

Abstract: the switch cabinet used in electric power system is mainly a electrical equipment movable and protect the safety of equipment, the application effect is very popular, with the aid of the switch cabinet temperature detection system can in time to grasp equipment operation condition, avoid safety accident happened. This paper first introduces switch cabinet temperature detection system overall design scheme, and respectively from the hardware circuit and software design two perspectives system design scheme.

Targeting the slack development of construction technology in our country, this paper attempts to analyze the problems that appear in the process of the popularization and application of the new technology, new techniques, new materials and new equipments. The paper holds that the current valuation model has its shortcomings, which is unable to reflect the expense bearing principle in this market economy that the person who gets the profits is supposed to pay the expense, thus impeding the initiative of the popularization and application of the 4 new's. Therefore, the paper suggests that the technological application sustenance be added to the valuation models and the connection be established between the valuation of projects and the application of the 4 new's, ensuring that all the construction units will bring into full play their initiative in applying the 4 new's and speed up the pace of the development, popularization and application of the 4 new's in our country.

Points for attention in compiling of bidding document are discussed with examples of coal industry from the tendering agent’s viewpoint. The main body of the paper deals with the primary principle, qualification requirements, commercial and technical requirements, evaluation method, examine and verify of bidding document.