Forthcoming Articles http://www.mtyhg.com.cn EN-US http://www.mtyhg.com.cn/EN/current.shtml http://www.mtyhg.com.cn 5 The dew point analysis instrument in Hebi coal chemical methanol project in the Henan Energy and Chemical Group was introduced, the instrument components were also introduced, the principle of the sensor was briefly disscussed. The instrument of HMT360 type dew point was introduced, the common problems in installation were analyzed, and the corresponding preventive measures were put forward. The related daily maintenance knowledges in the dew point meter normal operation were introduced, the problems in operation were analyzed, and some useful experiences were provided.

]]> During the operation of chemical plant, high temperature, high pressure, toxic and flammable medium leakage lead to safety and environmental threats, so the leakage should be solved by the pressure sealing technology. The principle of the pressure sealing and plugging technologies, and its application and effect in the chemical plant were introduced. The common sealing technologies were explained in detail. It is pointed out that the pressure and plugging has become a essential technology for chemical enterprise to reduce losses and make "no leak factory", become a kind of routine maintenance mode for chemical plant.

]]> Steel made low pressure wet gas holder is a low pressure gas storage equipment. The security of the steel made low pressure wet gas holder used in the petroleum chemical industry, municipal engineering was researched from the aspects, the operation pressure of the wet gas holder, the design for filling water and antifreeze, and the safety instrument design for tank level measuring and water level detection, temperature and pressure detection. When steel made low pressure wet gas holder is constructed in the north of China, antifreezing should be considered, instead it didn't need to be considered in the south. Therefore, designers should consider the antifreezing of the gas holder when they ensure its selection scheme.

]]> In order to meet the needs of network and information of production equipment in modernization mine, solve information isolated island problem in coal mine communication process, underground coal mine communication design scheme based on wifi was put forward based on improvement of network hardware. The practice showed that this communication scheme could achieve wireless transmission of video/picture signal, underground personnel location and gas monitoring while completing voice communication, which was easy to extend and maintenance, and meet balance of safety and cost control during coal mine operation.

]]> Based on special gas occurrence manner of coal seam roof limestone, comprehensive gas treatment of split source, draining while mining and strengthening corner drainage and ventililation was adopted in Shanxi Yitang Coal Industry Corporation. Through gas drainage in 200m ahead of working face, gas pressure under face roof was controlled in safety value, which solved potential safety hazard caused by transfinite gas in stope face and provided guidance and reference to coal mine gas occurence in similar geological conditions.

]]> As automation level of mechanization coal mine improved, safety management of fully mechanized mining equipment became more and more important, which made a difference in improving work efficiency of enterprises. Key points of safety pre-control management of fully mechanized mining equipment were summarized, its beforehand prevention and key links of safety were put forward, which enhanced productivity, curbed occurrence of sporadic engineering accidents and guranteed safety production.

]]>  Roadway speedy drivage was a systematic and complex engineering, afftected by factors of people,machines and technology. In order to increase speed and efficiency of engineering, overall quality of builders needed to be strengthened, chose more advanced and reasonable construction equipment, improved construction techniques and strictly followed construction procedures for preparation of work.

]]> Water hazards with emergent property were very common in coal mine industry, which hindered normal production schedule and brought potential menace including worker casualty, financial loss, etc. All of these showed that exploration and reconnaissance of geological work, as well as combination of water hazard prevention and coal mining geology needed to be strengthen, influence factors of geological disaster needed to be analyzed. Taking valid measures not only controlled hindden danger but also ensured personal and property security. Based on study of this combination, development status of chinese geological work was described, its main job contents were analyzed briefly, and its necessity was discussed.

]]> Important role of coal electrical machinery equipment management system was inroduced and its design and implementation were analyzed. In actual operation, multi factors caused breakdown and accident which affected coal production. In order to gurantee normal operation of coal mechanical equipment, scientific management system was designed and developed, which realized monitoring and control of operation of mechanical and electrical equipment, ensured working performance of coal mechanical equipment and gave full play to application.

]]> Based on karst cave detection with taking a certain place of Xingtai as research object, the direct-current electrical sounding with strong anti-interference ability was used to detection work in this area by comparing advantages and disadvantages of three geophysical methods of time domain electromagnetic methods, high-density electrical method and direct-current electrical sounding. The practice showed that three-electrode electrical sounding method could detect karst cave development situation much better in detecting area of relatively flat terrain, good ground conditions along with side slope, which provided physical geography basis on karst cave management work in the future.

]]> Based on karst cave detection with taking a certain place of Xingtai as research object, the direct-current electrical sounding with strong anti-interference ability was used to detection work in this area by comparing advantages and disadvantages of three geophysical methods of time domain electromagnetic methods, high-density electrical method and direct-current electrical sounding. The practice showed that three-electrode electrical sounding method could detect karst cave development situation much better in detecting area of relatively flat terrain, good ground conditions along with side slope, which provided physical geography basis on karst cave management work in the future.

]]> Ground temperature of Qianjiaying Mine closed to 30 degrees and temperature of west wing from -600 to -850 level belonged to high temperature zone. West Wing coal water and Ordovician limestone water, as well as West Wing of high temperature and ingress of Ordovician limestone water had a certain kind of relation. At the bottom of the Ordovician limestone, hot water entered into roadway would form a stable heat source. Reflecting two aspects of water disaster: one was each containing water layer closely contactiing with bottom water in Ordovician limestone and the other was excessive water temperature, the connection channel between coal water and Ordovician limestone water were found out. Causes of high geotemperature anomaly were analyzed in Qianjiaying Mine and corresponding measures for prevention and control of water disasters were formulated.

]]> Necessary critical curvature values of structural fracture formation was determined and calculation model of constructional curvature method was set up based on principal curvature formula of volcanic target stratum structural surface in research area through differential calculus principle, along with principle and prerequisite for application of constructional curvature method in volcanic reservoirs structural fracture prediction. Taking gas reservoir of volcanic target stratum in Anda Xujiaweizi area as example, fracture development of target stratum was predicted by constructional curvature method, which showed that high value area of structural main curvature and log fractal dimension coincided quite well with high output gas well part.

]]> After the first phase coal coking methanol projec of Fengfeng Group was completed in 2009 with 950 100 t/a of coke production, 67 000 t/a of methanol production,  the post-project evaluation was carried out. The desired effect during the project decision-making stage and the final actual effect after the implementation of the project were compared from project macroscopic development target, project direct purpose, project investment aspects, and the sociality of project was evaluation. It is pointed out that various technical indicators, capital investment, construction period, production, environmental protection, and soil and water conservation of the project achieve the anticipated target , and the employment, worker income, national tax and local fiscal revenue are increased, the development of the national economy and regional economy development are promoted,thereby implementing  both the economic and social benefits.

]]> Development and application of chinese auxiliary slope endlesss rope towing standard rail trapped rail transport were introduced. Based on auxiliary blind inclined shaft in a Shanxi capital construction coal mine undertaking requirement of large equipment and all mine transportation, its desgin and selection calculation were introduced emphatically. Main structural component design of this system was reasonable, which better solved auxiliary transportation problems of large equipment and large freight volume under complicated condition of coal mine.

]]> Analysis of corresponding relation of angular speed and amplitude around structural vibration period provided reference to structure design. In order to avoid structure design problems brought by resonance, damping measures were given, which made a difference in structural safety of coal screening building.

]]> In order to eliminate potential safety hazard of coal mine producing activity in equipment in use, taking practical application of ultrasonic flaw detection technology in axle parts as example, nondestructive testing technology could test internal defect of workpiece effectively without damage based on analysis of its features, applied range and boundedness, which facilitated maintenance of coal mine equipment, prevented occurence of accidents due to defects and greatly reduced risk of coal mining enterprises.

]]> Based on failure of slime water treatment capacity in Baodian Plant and exisiting problems in safety operation of concentrater, concentrater water layer automatic detection device was produced, its field applications and principles were introduced as well. The pratice showed this simple and reliable device could detect conditions of concentrater water layer correctly, ensure its safety operation and provide technical experience to safety operation dection of similar equipments.

]]> Coal mining mechanic equipment was an important foundation in production operations of coal enterprises and application of mechanical equipment maintenance method made a difference in long term development of coal enterprises. In order to slove various faults caused by long term running of relevant mechanical equipments in poor working enviornment and prolong service life of mechanical equipment , application of maintenance method was summarized and contents and main points of maintenance management were researched.

]]> Taking joint production of coal and electricity in China Coal Pingshuo Group as example, independent operation business accountings of three units enterprises under the same investor were acquired and effect of maximining overall interests of group was achieved on the basis of mutual use of three products, which included that coal washery supplied coals to power plant and coal chemical industry, power plant provided power to coal chemical industry and coal washery, power plant and coal chemical industry supplied steam to each other and heat addition to coal washery, which provided realistic reference to development of coal and electricity integration.

]]> Taking Jinhuagong Mine as example, a set of waste belt cutting machine was designed in order to recycle waste belt, its design consideration, working principle and advantages were discussed. Meanwhile, its structure, function and usage method of main parts, model selection of electromotor and reduction box were analyzed. As a result, reasonable structure design of waste belt cutting machine guaranteed good operation condition, which had obvious economic benefit.

]]> Based on subsidiary transportation mode in north area of Chiyu Mine, two schemes of continuous towing vehicle and monorail locomotive traction were analyzed from aspects of system link, work force and investment. Monorail crane in mine subsidiary transportation could meet needs of equipment, material and personnel transportation, which made continuous transport from transshipment point to working face come true, reduce system links and work force and improve transport efficiency.

]]>  The hardness of industrial desalination wastewater is high. The removal of magnesium ion and calcium ion in the system were studied by chemical method and adsorptive method. First of all, the magnesium ion in the wastewater was precipitated by calcium oxide. Second, the calcium ion in the filtrate ,in which magnesium ion has been removed, was adsorbed by zeolite. In addition, calcium ion was removed using carbon dioxide method , which is environmental friendly. The results show that the best operation conditions include: the mole ratio of calcium ion in calcium oxide solution and magnesium ion in wastewater is 1.5; the pH value regulator is not necessary to be added into the system; when the amount of  zeolite is 2 g and oscillation time is 16 h, the precipitation rate of calcium ion can reach 100% for the treatment of 200 mL fitlrate. Therefore, carbon dioxide has a certain effect on the removal of calcium ions. The research has guiding role in the practical application of removal of calcium ion and magnesium ion in desalination wastewater .

]]>  Two kinds of light calcium carbonate(LCC) sample were selected, in which slurry AD755 dispersion modifier was added and was not added after carborization production, and their sizes were tested, the effects of AD755 dispersion modifier on the final size of calcium carbonate were studied, the particle changes of the modified superfine LCC which storage lives were more than 1 year were compared, the particle differences of the different LCC prepared using different types of dispersing reagents(e.g. OM7, sodium hexametaphosphate and a flow modifier) were understood. The results show that AD755 can reduce the dissolution of calcium carbonate in the calcium carbonate granules test, and play a role in dispersion stability; after the excellent modified superfine LCC was stored for a certain period of time, its particle  change is very subtle; during the specific application of  LCC using different dispersing reagent, its true paricle is different.

]]> In order to study pressure law of dynamic pressure roadway in deep thick coal seam, theory analysis, numerical simulation and field measurement were used to analyze it. The results showed that roof subsidence, roadway stability and stress around the tunnel were related to size of sectional area. The numerical simulation showed that 50 m distance in front of working face was affected by mining, and the change would be more severe in 50 m behind lagging face, distance from 50 m to 150 m still had stress increasing. The 14103 roadway was affected by adjacent working face and its intense area was 47 m ahead of working face. The severe area affected by this working face was within 8 m ahead of working face. High preloading and high strength bolts was used in deep coal seam support, and coal seam residual strength was strengthened.

]]> Based on water inrush statistic data and unit water use index, evaluation methodology of coal field baseboard was put forward. Taking water bursting point statistical overview of Tangshan Kailuan Lvjiatuo Coal Mine as example, the relation between water inrush security and hydrogeological feature was analyzed which provided theoretical reference to water bursting evaluation of mining safety.

]]> Rationality and arrangement of working face hydraulic support were put forward based on strength calculation and hydraulic support selection in 8310 large mining height working face. Supporting intensity and effect of hydraulic support satisfied request of roof support through analysis of mine pressure law and extraction test of working face, which provided technical parameters and data support to hydraulic support selection and study of mine pressure regularity.

]]> Based on decreased coal reserves, complicated geological conditions and many irregular working face caused by fault, protecting pillar and boundary coal, techniques of face angle adjusting, spining, continued support, reduction frame and high grade support were used in 94604 fully mechanized mining face of Fengfeng Group Dashe Mine, together with adopting mining scheme of rotary continuous mining. The practice showed that resources of boundary coal and protecting pillar under complicated mining geological condition were exploited, and mining area of protective seam was increased to 30,000 m2, which changed intense connecting passive situation of working face in Dashe Mine.

]]> Roadway support in goaf of 81303 large height mining face of One Mine was designed and researched. Based on rock bolting dynamical systematic design method of finite difference software FLAC3D, valid support scheme was put forward, which had good support results though mine pressure monitoring and could be used in same roadway conditions to promote popularization and application.

]]> In No.2 coal seam mining of Yangquan Group Dengmaotong Coal Industry Corporation, effect, security and cost of two gas drainage methods were compared comprehensively. Large diameter drilling drainage was used to shorten drainage gap, every 20m in pillar bewtten adjacent spare face intake airflow roadway and stope face return airway were set a gas drainage hole with 400mm diameter to replace roadway construction and avoid dead zone of gas drainage, which improved corner transfinite gas in working face and ensured safety production.

]]> Based on numerical simulation analysis of deformation characters of surrounding rock in coal mine, finite element model was built and deformation characters and stress distribution of surrounding rock were put forward. Through analysis of comprehensive supporting scheme, deformation and stress state of roof and floor were controlled, which then provided optimization suggestions of timbering and technical experience to study on support and reinforcement of coal mine tunnel.

]]> Height of caving zone was the most important part of whole production process, concerning about water diversion, gas control, gas extraction and ascending mining. In order to analyze height of caving zone in a coal mine, numerical simulation method was applied to research, meanwhile, intuitive analysis, displacement analysis and stress analysis were used to estimate caving zone, which determined that the height of caving zone was 7.5m.

]]> Based on goaf water in No.10 roof of a coal mine, probing technique of roof water was intensified, comprehensive control measures of roof water was carried out. No.10 and No.11 coal in tunneling phase of joint roadway opened hole for drainage, and conducted grouting water, which avoided bad influence brought by goaf water.

]]> Establishing coal pillar width and the mining width were two of the most important factors in the process of strip mining， not only related to the recovery rate of coal resources， but also made a difference in stability of coal pillar， rock destruction and surface subsidence. In order to determine optimum width of coal pillar and mining width in mining process of 1109 working face， design and optimization of mining plan were analyzed. Optimum mining width of 1109 working face was 58.8m， and optimum design of coal pillar width was 39m according to its theoretical calculation. The stability of coal pillar was analyzed by numerical simulation method， and the results showed that the size of coal pillar was scientific and reasonable.

 

]]> Based on serious coal wall spalling, extremely broken roof and difficult controlling flow of coal and ballast occurred in stoping process of 14259 light sublevel caving face in Xintun Mine, which was an island mining face and affected by surrounding goaf, technology of coal wall strengthened with cement grouting was applied to promote working face smoothly and achieve better application results. It made a difference in coal wall reinforcement of island mining face under similar geological conditions and had a strong promotional value.

]]> Based on driving speed of high pumping lane was seriously lagging behind, optimization design and new methods of system lane were discussed. What’s more, three original roadway combinations of high pull off lane, high pumping lane and high pumping gangue slope slip with correlative functions of baiting, gangue and air reture were put forward, which decreased quantities of roadway drivage and achieved initial success.

]]> Occurrence of coal mine water inrush accidents were mainly relevant to abnormal water inflow, exceeding water discharge capacity and invalid emergency reaction besed on analysis of using PHA method in accident reasons, which got elementary event of FTA, determined analysis content and laid a solid foundation of FTA. On the basis of various subjective and objective factors, fault tree model of water inrush accident was constructed. According to minimum cutset and path set got by Boolean algebra rule and importance analysis of structure, primary causes of coal mine water inrush accidents were summarized. Combination of PHA and FTA method was conducive to result accuracy, provided a new way to accident prevention and improved safety evaluation level of coal mine enterprises.

]]> Based on 1301 working face of Jingfang coal industry under the influence of abandoned roadway, as well as fracture mechanism and caving ability of top coal, effects of coal caving and top coal were researched in different ways. Top coal caving characteristics in 1301 working face was firstly analyzed through mathematical method, which proposed a new way of coal caving. Then coal caving was used in old coal mining influence area, and determined its rationality and practicability.

 

]]> Based on geological conditions,engineering quality and personnel operations in production process,safety production of fully mechanized top coal caving face was easily affected by transport plane and inverted frame. Taking 28416 fully mechanized caving face of Guandi Mine as example, reasons,hazards,and corresponding measures about how to successfully control transport plane and inverted frame were researched, which put forward scientific solutions, optimized production process, ensured normal production of working surface and guranteed operation safety of personnel, showing that it could be used widely in every fully mechanized top coal caving face.

]]> Narrow coal pillar gob-side entry driving technology was adopted to 2120 working face during air way digging process in Julong Mining Corporation Ltd., reflecting increasing depth of mining and tense extracting joining. Reasonable coal pillar size, cross section shape of roadway, supporting form and construction method were determined in goaf side arrangement working face. It made social and economic sense to reduce coal resources loss and guarantee normal mining cohesion.

]]> 12 coal belonged to confined aquifer mining beased on hole position analysis of borehole and field work experience of a mine. Safety of 12 coal mining was evaluated on the basis of water bursting coefficient method and safety pillars water resisting property method to reflect its mining feasibility, which showed that water bursting coefficient was 0.044 MPa / m less than its critical value; floor water resistance coefficient was 0.224 MPa / m and minimum thickness of working face floor was 36m greater than setting thickness of water prevention coal and rock column. As a result, it was clear that 12 coal mining over pressurized water was safe and feasible.

]]> In order to increase advance rate in rock roadway of underground coal mine, achieve interoperability of mine production system and improve tension of mining replacement, drilling and blasting method together with fully mechanized mining method used in rock drivage which were popular in chinese major coal enterprises were discussed. Meanwhile, the adaptation of their corresponding mechanical scheme in roadway construction site were summarized.

]]> Based on thin bedrock in shallow buried deep working face and violent roof weighting, support suitability and 3103 mine pressure law of shallow buried deep working face were studied on the basis of rock pressure mearseanment. Average first weighting interval of working face was 11.13m, first weighting interval in middle part was larger than its sides;  average periodic weighting length was 12.9m; average dynamic factor was 1.47, peak of ground pressure strength was within holder rated operation resistance range. Setting load was obviously low which was not conductive to roof maintenance. Average maximum pressure of working face bracket right column was much bigger than left one, and had poor balanced load performance.

]]> Optimization and design of power supply system of fully-mechanized mining equipments in modern mine made a difference in high production and high efficiency. Formulation of power supply system for fully mechanized coal face, equipment load distribution, capacity check of substation, selection check of high voltage explosion proof switch and cable selection were optimized and designed on the basis of theoretical analysis, which guaranteed stability of power supply system in fully mechanized mining face. After its optimization and design, the impact on entire power supply system was little in th process of frequently starting of various equipments, which guranteed power supply quality and normal operation of production system.

]]> Three working face of 4 coal seam and four working face of the 8 coal seam in Xingzhe Mine were sampled and analyzed respectively in order to know their coal quality and calorific value. In the whole sampling process including 84 droups, average calorific value of each working face and calorific value of each coal seam were analyzed. Based on average calorific value of 4 coal seam and 8 coal seam, the calorific value data of entire mine was made sure.

]]> Continuous mining technology was decided to be used in coal mining instead of fully mechanized coal mining on the basis of influence analysis of coal pillar and geological struture in 9110 working face of Huahong Company, improved success example,support pattern, drift layout and model selection of continuous mining technology in 9110 working face of Huahong Company were described, which provided powerful technical support to application of continuous mining technology in irregular region.

]]> Underground brine resource is rich,has a high resource value and economic value,and can be used in military industry, chemical industry, electronics, pharmaceutical and other fields. For further development and utilization of brine resource, evaluation of development and utilization prospects, of the brine resource research into the cause, evolution and source information of the brine, the brine was discussed from the viewpoint of underground brine  chemical characteristics. According to the sodium chloride coefficient,desulfurization coefficient,calcium magnesium coefficient, sodium and calcium coefficient, bromine chloride coefficient a and potassium chloride coefficient in groundwater, the genessis of the underground brine was analyzed and speculeted; according to the mole concentration ratio (Na + Ca)/and Cl compared with other water bodies to  genetic types were determined analysized ; according to the mole concentration ratio cNa/cCl judging Na and Cl,the evaporation concentration and leaching effect of chlorine salt dissolving,formation were judged in order to brine determined the formation procecs of the brines; according to the ratio of the density of Cl and Br,the sediment source of the brine were determined.

]]> Rectisol washing is a physical absorption process using methanol as the solvent, it's widely used in removal of carbon dioxide and hydrogen sulfide of industrial gases. The basic principle of rectisol washing process was introduced. Two kinds of purification process, the One-Stage process and Two-Stage process were introduced and analyzed particularly. The application and research progress were overviewed. The measures for solving the problems of high methanol consumption, lacking and non-uniform distribution of cooling capability were introduced. The ways of Two-Stage and Three-Stage liquid ammonia cooling recycle for reducing energy consumption were given. Finally, the future development of rectisol washing technology were prospected, it was provided reference for the application and research of rectisol washing technology.

]]> The chromium contaminated soil in the Da Tong Chemical Corporation Ltd. was used as the research object, the removal effects for hexavalent chromium and total chromium in chromium contaminated soil of six kinds of leaching agent were studied to select the optimum leaching agent. Through orthogonal experiment, the optimum leaching conditions of the optimum leaching agent were determined. And the removal effects for hexavalent chromium and total chromium in chromium contaminated soil of complex leaching agents were also investigated. Ultimately the optimum washing times of the optimum leaching agent were determined. The results show that citric acid has the highest leaching removal efficiency of hexavalent chromium and total chromium,and the optimum leaching conditions of citric acid were 0.5 mol/L of citric acid concentration, 4 h of washing time, 2.0 of pH value, and 1∶10 of the solid-liquid ratio under which the removal rate of hexavalent chromium and total chromium reach 100% and 93.03% after 4 times washing, respectively. And the total chromium concentration in soil reduces from 2 630 mg/kg to 183.4 mg/kg, which can meet the secondary standard of site remediation requirements of "Soil Environmental Quality Standards".

]]> Proportion of main function groups were achieved by analyzing the FT-IR spectra of thermo-modified Zhaotong brown coal. Based on the results and the basic structure of brown coal, the simplified structure model of Zhaotong brown coal was constructed. The length and energy of chemical bond were figured out by using density functional theory at the B3LYP level. The length of chemical bond of C—C was the longest, secondly the bond of C—O in the side chain or attached directly to the benzene ring. The length of chemical bond of C    O was the shortest, however its chemical bond energy was the biggest.

]]> Mining technology and geological conditions made a difference in destruction of coal seam mining face. Impact analysis of permeability and strain stress of seam floor was given through experiment measures. Based on data analysis, it was clear that rock permeability would be incresed significantly by increasing stress because of densification effect of air space ratio and fracture. As a result, increase of deformation damage would cause rock permeability,and then induced flooding accident. This analysis contributed to enhance safety evaluation of coal mining.

]]> Yunjialing coal mine has enjoyed long history of both exploration and mining. The wide range of mining, numerous aquifer, complex structure, which is a big hidden danger to the safe production of coal mine. Based on the exploration and exploitation of geological data, through regional and minefield hydrological conditions analysis, this paper researched the seven aquifers detailed within the scope of mine and the mine water filling source and water filling channel. Through the analysis of mine water inflow, water inrush and the difficulty to control water, considered that the hydrogeological type of 2# coal mining is classified as medium type. According to the hydro-geological conditions, we put forward water hazard control measures,such as, advance detection, reserved coal pilla, grouting reinforcement, and so on.

]]> Characteristics of mine pressure appearance in working face played an important role in safety production, support selection and roadway maintenance of working face. 3 observation stations and 18 observation lines were arranged in productive process to minitor characteristics of mine pressure appearance in F63091 working face of a coal mine. The monitoring result showed that because of the inclination of working face, the gangue falling from the roof slipped and accumulated in the goaf area of fully mechanized caving face and played supplementary support to the upper fully mechanized top coal caving face and roof above mined out area, which made middle area and the upper region of hydraulic support under the load of the lower region of the hydraulic support

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