205results about How to "Safe and efficient production" patented technology

The invention relates to a polyurethane reinforcing and filling materials for coal mines. A component A is a polymethylene polyphenyl isocyanate, a component B is obtained via the follow steps: mixing and stirring the following ingredients: 33 to 70 wt% of polyether polyol, 0 to 40 wt% of polyester polyol, 0.1 to 1.5 wt% of composite catalyst, 6 to 30 wt% of composite flame retardant, 0 to 15 wt%of foaming agent, 0.5 to 2.5 wt% of stabilizer, 0.5 to 10 wt% of foam stabilizing agent, 0.1 to 5 wt% of antistatic agent , 5 to 25 wt% of plasticizer at 30 DEG C to 50 DEG C for 0.5 to 2 hrs; and when in use, the component A and the component B are together pressed into a coal (rock) layer according to the mass ratio of 1 to 2 : 1, penetrate into tiny cracks and expand, meanwhile react and generate CO2 gas and further expand, thereby effectively reinforcing and sealing processing areas. The compressive strength of polyurethane reinforcing and filling materials for coal mines is more than 55 MPa, the bond strength is more than or equal to 4 MPa, the foaming factor is less than or equal to two times. The invention can meet the need of coal mine safe production, and can be used for hydropower, construction, mining, transportation and other industries.

The invention relates to a permeability improvement technology for a coal bed gas reservoir cap by using three-dimensional fracture network modification. The technology is as follows: building a bedding horizontal well from ground to top and bottom plates of the coal bed of an area not mined; building bedding, three-dimensional cross-type or multi-branch long boreholes on the top and bottom plates of the coal bed of the area not mined through perforation and segmented fracturing or existing sinking and driving engineering, and then carrying out hydraulic fracturing; modifying the coal bed gas reservoir cap into a crisscross fracture network system to form a modified volume; building various types of drainage boreholes in the modified volume; and carrying out negative pressure extraction together with a fractured well, so that coal bed gas can be continuously desorbed and dispersed and then extracted out in large scale through the modified volume. According to the invention, the crisscross fracture network system is formed in the coal bed gas reservoir cap, so that the coal bed gas can be continuously desorbed and dispersed at negative pressure and then extracted out in large scale through the modified volume, thus the content of coal bed gas in the modified bed can be quickly reduced to be below the safety standard in the outburst prevention formulation, and safe and high-efficiency production of mines can be realized on the basis of forming scale coal bed gas development.

The invention relates to an anti-sloughing diluted filtration reducing agent for drilling fluid and a preparation method thereof. The filtration reducing agent is prepared from the following raw materials by weight portion: 80 to 120 portions of substance containing humic acid, 30 to 80 portions of sodium metabisulfite, 300 to 500 portions of water, 10 to 30 portions of ammonium hydrolyzed polyacrylonitrile, 2 to 15 portions of cross linking agent, 30 to 50 portions of potassium hydroxide, 5 to 20 portions of complexing agent, 1 to 10 portions of urea and 10 to 20 portions of organic silicone resin. The preparation method comprises the following steps: weighting the water, the potassium hydroxide, lignite or peat or weathered coal and the sodium metabisulfite by weight portion, adding the materials into a stirred autoclave, sealing the stirred autoclave, raising the temperature, performing reaction and reducing the temperature; adding the ammonium hydrolyzed polyacrylonitrile, the cross linking agent, the complexing agent, the urea and the organic silicone resin by weight portion into the stirred autoclave after the temperature reduction, sealing the stirred autoclave, raising the temperature and stirring for reaction; and discharging, and performing spray drying on a product to obtain a finished product. The anti-sloughing diluted filtration reducing agent has good comprehensive performance, can prevent slough of mineshafts and reduce the filtration loss and viscosity of slurry, and is easy to realize safe production.

The invention discloses a method for determining the first weighting supporting resistance of shallow thin bedrock coal seam mining, and relates to the technical field of coal seam mining. The method comprises the steps that the sliding instability supporting force of a non-symmetric three-hinged arch structure with an upper roof not picked and the length of a rock are determined; the sliding instability supporting force of a monocline rock structure is determined after the upper roof is picked; the non-symmetric three-hinged arch structure with the upper roof not picked is analyzed, and a first weighting support-surrounding rock relation model of shallow thin bedrock coal seam mining is established; a load transfer coefficient is determined; the load of the rock on the upper roof during first weighting is determined; the pressure transferred through sliding instability of the upper roof structure is determined; the weight of an immediate roof rock column is determined, and the first weighting supporting resistance of shallow thin bedrock coal seam upper roof is determined. According to the method, a top plate structure for first weighting of a shallow thin bedrock coal seam is fully considered, a mechanical model is established for resolving, the reasonable supporting resistance of a support in the first weighting period is obtained, and the method has important theoretical significance and practical value in achieving safe and efficient production of a mine.

The invention relates to a foamable phenolic resin strengthening and filling material for coal mine. In the foamable phenolic resin strengthening and filling material for coal mines, a component A is one of inorganic acid and organic acid or a mixture of inorganic acid and organic acid; and a component B is prepared by mixing 90 to 100 weight parts of urea modified phenolic resin with solid content of 65 to 90 weight percent, 6 to 10 weight parts of composite fire retardant, 0 to 15 weight parts of foaming agent, 1 to 5 weight parts of stabilizing agent, 1 to 15 weight parts of cosolvent, 2 to 16 weight parts of antistatic agent and 10 to 30 weight parts of plasticizer, stirring at the temperature of between 30 and 50 DEG C and reacting for 0.5 to 2 hours. When the foamable phenolic resin strengthening and filling material is used, the component A and the component B are mixed and injected into a coal (rock) layer according to the weight ratio of (1-2) : 1 and permeated into small cracks to expand and generate curing reaction for strengthening and sealing the region. According to the foamable phenolic resin strengthening and filling material for coal mines, the compressive strength is more than 40 MPa; the bonding strength is more than or equal to 3.0 MPa; and the foaming coefficient is less than or equal to two times. The foamable phenolic resin strengthening and filling material for coal mines can meet the requirement of coal mine on safety production and can be applied to the industries such as hydroelectric powder, buildings, mining, traffic and the like.

The invention discloses a comprehensive and integrative gas drainage method which can be used for solving the problems that gas drainage is difficult to realize due to soft coal beds and low air permeability of the existing mines and the drainage effect of the current single gas drainage technology is unsatisfied. The method disclosed by the invention comprises the following steps: (1) high-position fracture borehole drainage of the top plate of a coal bed; (2) heterotropic high-position borehole drainage of a return airway; and (3) upper corner pipe-laying drainage of a gob. According to the invention, the stress field and fracture field caused by mining and a gas migration rule are fully utilized, so that drilled holes are high in drainage efficiency and flexible in arrangement, a drainage system is simple, the gas concentration at a drainage outlet can be up to 15-24%, and the gas drainage efficiency can reach 55-67.3%. The method disclosed by the invention is a new technology and method in fully mechanized caving face gas control methods, can be used for reducing the occurrence of excessive gas accidents and reducing the losses of life and property, has very important and far-reaching significance and is strongly worthy to be popularized and applied.

The invention provides a high-dipping extremely-close-distance coal seam top coal caving mining method. According to the method, a transportation gateway is constructed along one side of a coal layer bottom plate and an air returning gateway is constructed on the other coal layer; the elevation of a bottom plate of the air returning gateway is 4-4.5m higher than that of a bottom plate of the transportation gateway; rectangular roadways are constructed between the two gateways at an interval of 10m and are used as connection roadways; hydraulic brackets are distributed on two coal layers along the thickness directions of the coal layers; each circulating unit advance of a worktable bracket is the same as the distance of the connection roadways; in a top coal caving process, top coal discharged by the coal layers of the transportation gateway and manually-mined falling coal in a manner of manually shoveling coal and filling into a scraper plate conveyor to be transported out; the top coal discharged by the coal layers of the air returning gateway is filled into enamel chutes of the connection roadways in a manner of manually shoveling the coal to flow into a bracket tail beam of the coal layers of the transportation gateway, and is put into the scraper plate conveyor to be transported out by manually shoveling the coal. The high-dipping extremely-close-distance coal seam top coal caving mining method has the advantages of being simple in arrangement of a working surface, strong in adaptability, good in ventilation, relatively good in safety degree, large in supporting space and high in production efficiency.

The invention discloses a method of continuously and automatically producing 16 magnesium-rare earth intermediate alloys such as a magnesium-neodymium intermediate alloy. The method comprises the following steps: after melting a magnesium ingot raw material by a finery, adding a rare earth metal material, manually deslagging, and automatically stirring and homogenizing by a system, and sampling and testing alloy components which are qualified; then pouring an alloy liquid to an ingot case of a pig moulding machine through a metering pump to form a continuous and automatic ingot casting; and cooling the alloy liquid to form standard magnesium-rare earth intermediate alloys. The key point of the invention is as follows: the method is applicable to continuous and automatic ingot casting production of 16 magnesium-rare earth intermediate alloys such as the magnesium-neodymium intermediate alloy, so that the labor intensity of production is reduced, and the production safety is greatly improved in anhydrous environment production. The produced product is consistent and high in yield. According to a crucible manufactured by a nickel-free high temperature alloy steel plate, carbon content is not introduced in the production process, the production efficiency is high, and the method is applicable to continuous production on a large scale, free from environmental pollution. Waste residues can be recycled, thereby truly realizing safe and efficient production of the magnesium-rare earth intermediate alloys on a large scale.

The present invention relates to a mine pressure signal real-time visual demodulation system and demodulation method based on optical fiber sensing. The demodulation system is mainly formed by a mine pressure signal acquisition subsystem, an optical signal transmission subsystem, a photoelectric signal conversion subsystem and a digital signal visual processing subsystem. A mine pressure signal is collected through arranging an optical fiber sensor in a coal mine, the mine pressure signal is transmitted to an optical fiber grating demodulator for a mine in the form of optical waves and is demodulated into wavelength data, the digital signal visual processing subsystem demodulates the wavelength data into a mine pressure physical quantity and automatically outputs a visual mine pressure chart and a mine pressure monitoring report. The system and the method have the advantages that the demodulation system is comprehensive and diversified, the development performance is high; the system equipment is essentially safe and is especially suitable for a complex underground environment; the demodulation algorithm is professional, and the mine pressure demodulation is more accurate; a demodulation result is clear and visual, and the degree of visualization is high; the system response is timely and effective, the underground mine pressure can be displayed in real time, and the safe and efficient production of a coal mine is ensured.

The invention relates to a gob-side-entry-retaining supporting method, in particular to a gob-side-entry-retaining flexible roadside support and rigid entry-in support combined supporting method. The method comprises the steps that a row of point-anchor rope reinforced roadway top plates are arranged in a roadway in the tunneling period, a row of point-anchor rope reinforced roadway ribs are arranged in the side roadway rib of the non-working surface, and a row of constant-resistance anchor rope beam reinforced roadway top plates are arranged on the position a certain distance away from the side roadway rib of the working surface; and according to the data changing situation of the mine pressure in a retained roadway in the period of backstopping of the working surface and the showing situation of the roadway mine pressure, an entry-in supporting area in the retained roadway is divided into an advance supporting area, a lagging supporting area, a roadway-forming to-be-stable area and a roadway-forming stable area. According to the gob-side-entry-retaining flexible roadside support and rigid entry-in support combined supporting method, through the successful practice of cross heading under the 21702 working surface, an excessive coal safety pillar with the width of 5 m is recycled compared with tunneling of an original gob-side entry driving, the coal resource recovery rate is improved, a solid foundation is laid for popularization of the gob-side entry retaining technology in other mining-area working surfaces of the whole mine, and a brand-new thinking is provided for the excavation-replacement layout of the whole mine.

An anti-corrosion light feeding-oil-free mechanical arm based on a shape memory polymer is characterized by comprising a deformation component, a fastening part, a base and the like, and all the components are made of polymer materials, so that the anti-corrosion light feeding-oil-free mechanical arm can be applied to a severe environment with strong acid, strong alkali or the like. The anti-corrosion light feeding-oil-free mechanical arm has the advantages of being simple in structure, light in weight, free of oil supply, foldable and the like, further widens the use range of the mechanical arm, can largely relieve the labor intensity for operators, guarantees the personal health of the operators, and achieves safe and efficient production.

The invention relates to a roof cutting pressure relief protective method for an exploitation stop face of a fully mechanized working face, and belongs to the technical field of surrounding rock stability protection for a permanent tunnel by the fully mechanized working face. In the protection method, the exploitation stop face of the fully mechanized working face is preset between a coal mining tunnel area and a goaf, an overlying stratum layer over the exploitation stop face is cut vertically upwardly before that a three-machine system is evacuated from the exploitation stop face to obtain aroof cutting surface, the overlying stratum layer over the exploitation stop face is disconnected from the overlying stratum layer over the coal mining tunnel area by the roof cutting surface, so that when the three-machine system is used for support, stress connection between the overlying stratum layers over the exploitation stop face and the coal mining tunnel area is cut off rapidly. Influence of high stress of the overlying stratum layer over the exploitation stop face on stress of the overlying stratum layer over the coal mining tunnel area is eliminated effectively, a dynamic pressuresource acted on the tunnel is eliminated fundamentally, a large tunnel or a concentrated tunnel of the goaf is avoided from high concentrated stress, and the permanent tunnel is kept safe and stable for long time.

The invention provides an experimental device for hydraulically simulating non-uniform confining pressure of a casing pipe and a using method. The experimental device comprises a kettle body assembly,an experimental assembly, a pressurizing assembly and a data acquisition assembly, wherein the kettle body assembly comprises a kettle body and a kettle cover; the casing pipe in the experiment assembly is arranged in the kettle body, the casing pipe, a casing pipe upper cover, a casing pipe lower cover and a rubber cylinder form a sealed interlayer for curing cement, the outer layer of the rubber cylinder is wrapped with a double-semicircle cylinder sleeve, and the cement is injected into the sealed interlayer by means of a cement injection port of the casing pipe upper cover to be cured into a cement sheath; on the side surface of the kettle body, the pressurizing assembly composed of a pneumatic hydraulic pump, a hydraulic push rod and a mechanical pushing hand applies non-uniform confining pressure to the casing pipe in a direction perpendicular to the axial direction of the casing pipe, so as to simulate non-uniform load under the stratum condition; and the obtained experimentaldata are collected by means of strain gauges in the data acquisition assembly on inner side of the casing pipe and strain patches on the surface of the mechanical pushing hand and are transmitted to acomputer in real time by means of data lines, the experimental result is visual and precise, and the compression condition of the casing pipe under the real stratum condition can be effectively simulated.

The invention discloses a directional fracturing device and method for underground drilling. The device comprises a plurality of sections of casing pipes and fracturing pipes which are connected end to end, wherein the casing pipes are provided with directional fracturing control devices, and each directional fracturing control device comprises a screw hole with an adjustable angle and a one-way destructive conical screw matched with the screw hole; and the casing pipes are connected through stroke-controllable threaded connection assemblies or flange connection assemblies, and alignment scribed lines corresponding to the positions of the directional fracturing control devices in the circumferential direction are arranged on the casing pipes, so that the alignment scribed lines and the directional fracturing devices are always aligned. The method is mainly characterized in that after a hole is drilled in a roadway, the casing pipes are sent into the drilled hole, and the annular spacebetween the casing pipes and the drilled hole is sealed by grouting; and fracturing pipes provided with front packers and rear packers are sent into the casing pipes, and after entering the casing pipes from the fracturing pipes, the pressurized fluid flushes the casing pipes to fracture the coal rock mass when the pressure reaches the maximum bearing pressure of the directional fracturing controldevices. According to the directional fracturing device and method for underground drilling, provided by the invention, the fracturing direction is controllable, and various directional expansion forms can be realized.

The invention relates to a method for replacing a middle bottom-extraction rock roadway with a bottom-extraction rock roadway kilometer directional long borehole. According to the method, a construction mode for commonly constructing a gate road bottom-extraction rock roadway in a high-gas outburst mine to protect stope face gate road roadway excavation is utilized, a coal body in front of a common crossing hole pre-extraction roadway is constructed on the gate road bottom-extraction rock roadway, before the stope face gate road roadway and a standby stope face gate road roadway are constructed, advanced construction is carried out on the gate road bottom-extraction rock roadway, a drill site is constructed in the gate road bottom-extraction rock roadway, a crossing kilometer directional long borehole is constructed in the drill site, and advanced extraction is carried out on gas of a working face of an upper working seam. The method has the beneficial effects that the mining economiccost and the time cost of the working face are saved, the outburst risk and the gas emission quantity during the mining period of the working face are fundamentally eliminated, and the safe and efficient production of a mine is guaranteed.

The invention relates to a method for pumping coal bed gas from a long-distance pressure-relieved coal bed. When extraction is performed in the long-distance pressure-relieved coal bed, the coal bed achieves the critical desorption state, a large amount of free gas exists, and free methane also exists in other nearby rock layers, thereby causing huge potential safety hazard; if the long-distance pressure-relieved coal bed is very soft, the conditions of pumping along the coal bed are not satisfied, the problem can only be solved by only adopting a rock lane and crossing boreholes, however, the cost in this way is very high, the engineering amount is large, and the safe and high-efficient production of a coal mine is greatly affected. Before the extraction of the lower coal bed, the appropriate rock layer is selected nearby the long-distance pressure-relieved coal bed, the construction level comprises the multiple branch long boreholes, a large number of non-communicating cracks are penetrated, and the branch boreholes extend into the coal bed, thereby achieving the purposes of intercepting pressure-relieved gas and pumping the coal bed gas. The cost is lower, and the engineering amount is greatly reduced, thereby being an advanced technology integrating the safe and high-efficient production of the coal mine and high-efficient development of energy into a whole.

The invention discloses a continuous flow preparation method of diethyl methyl phosphite, which comprises the following steps: continuously adding ethanol and methyl phosphorus dichloride into a feedport of a continuous flow reactor, and continuously obtaining diethyl methyl phosphite at a discharge port of the continuous flow reactor. The method has the advantages of small liquid holdup, safe and efficient production process, solving of the problems of long reaction time and low efficiency in kettle type reaction, high product yield and purity, and simple and efficient process operation.

A regulator for growing se-enriched tea leaves is prepared through fermenting pig dung and silkworm excrement, filtering, adding sodium selenate (or selenite) and dissolving. Its advantage is high Se content in tea leaf. It is applied through diluting and spraying it on buds of tea tree.

The invention discloses a luminous liquid level meter for indicating a liquid level position in a liquid storage container, which solves the problem that liquid level is not easy for clear observation at night and in places with relatively dark light at relatively low cost. According to the technical scheme adopted by the invention, a light source and an electrical box are arranged at the end of a liquid level indicating tube which is made from a transparent material and vertically installed on the outer wall of the liquid storage container, a liquid level buoy with a reflective mark is placed in the tube, and scale marks are arranged on the tube wall or positions close to the left side and the right side of a tube body. In case of need, the electrical light source is started to form a bright light area inside and surrounding the liquid level indicating tube to facilitate observation; and the reflective liquid level mark on the liquid level buoy reflects light rays and then clearly indicates the current liquid level, and can indicate the current liquid volume in the liquid storage container by matching with the scale marks.