71results about How to "Suppress spontaneous combustion" patented technology

The invention relates to a coal mining method for co-mining gas in a mine. A method for injecting nitrogen in a sealed manner is adopted to close an upper drift and a lower drift of a stope face to ensure that the concentration of gas in a closed space is over 20%, the concentration of oxygen is lower than 12%, so that the explosive hazard of the gas is eliminated, and high-concentration gas in a roadway is drained so as to be utilized. A safety pressure-relief roadway needs to be remained in the mine with dangers of coal and gas outburst, and is used for releasing high-pressure gas generated by coal and gas outburst, and improving disaster resistant capability of the mine. An air regulating system is arranged in the closed space for regulating air, and a worker operates in the closed space under the condition that the safety protection is well done. Due to adoption of the method, the problem of gas explosion is solved fundamentally, the utilization ratio of gas is improved, fire disasters of the coal mine are eliminated fundamentally, the oxidation corrosion of various metal equipments is reduced, and simultaneously the equipment does not have anti-explosion requirements. As workers breathe air carried per se, the occurrence of respiratory occupational diseases is avoided. Therefore, the coal mining method for co-mining gas has extremely large popularization value.

A method of operating an internal combustion engine generally comprises supplying a primary fuel having a first octane rating at to an intake manifold of the engine, supplying an amount of racing fuel concentrate to the intake manifold in response to a signal associated with engine load, and varying the amount of the racing fuel concentrate supplied to the intake manifold in response to variance of the signal. The racing fuel concentrate is a petroleum distillate racing fuel, such as Torco® Mach Series Accelerator Race Fuel Concentrate, that significantly increases the octane rating of the primary fuel when the concentrate is supplied to the manifold.

The invention discloses a capsule fire preventing and extinguishing material for a coal bed fire and a preparation method of the capsule fire preventing and extinguishing material. The fire preventing and extinguishing material comprises a core material and a coating layer with which the outer side of the core material is coated. The core material is prepared from a powder stopping agent which is the mixed powder stopping agent comprising ammonium carbonate, ammonium dihydrogen phosphate, ammonium chloride, diammonium hydrogen phosphate and calcium chloride. The coating layer is prepared from an organic polymer which is melamine formaldehyde resin. The core material is coated with the coating layer through a water bath drying method. The mass fraction ratio of ammonium bicarbonate to ammonium dihydrogen phosphate to ammonium chloride to diammonium hydrogen phosphate to calcium chloride to melamine formaldehyde resin is 24-27:10-11:18-20:9-10:6-7:25-33:0.5. The capsule fire preventing and extinguishing material has the advantages of being nontoxic, free of pollution, convenient to store, capable of evenly covering a fire area, short in fire extinguishing period and good in effect, having the leakage stoppage, oxygen isolation, cooling and inhibition effects, being convenient to use and convenient and fast to operate and the like.

The invention relates to a composite microcapsule stopping agent for preventing coal spontaneous combustion and a preparation method of the composite microcapsule stopping agent. The stopping agent comprises a wall shell and a stopping agent solution sealed in the wall shell. The wall shell is mainly prepared from the following components of, by weight, 70-80 parts of phase-change materials, 10-20parts of flame-resistant materials and 8-12 parts of reinforcing materials. The stopping agent solution is ionic liquid or a chloride solution. The stopping agent solution is evenly composited to thecomposite phase-change materials to obtain a mixed emulsion, the mixed emulsion is sprayed into a dry porous medium in an emulsion-drop mode through a spraying device to enable mixed emulsion drops to be further atomized into mist drops with the particle diameter of 30-50 [mu]m, and after the mixed emulsion which is formed into the mist drops makes contact with cold air, the composite phase-change mixed materials are quickly solidified to wrap the stopping agent solution to form the composite microcapsule stopping agent. The stopping agent can be evenly distributed in coal seams, the coveragerange is wide, accumulation of heat is prevented, coal spontaneous combustion is resisted, and the preparation method can efficiently produce and process the composite microcapsule stopping agent.

The invention provides process method and device for the transformation and quality improvement of low-rank coal. The process method comprises the following steps of: drying the low-rank coals in a drying device by utilizing hypoxic gas supplied by a first combustion chamber; pyrolyzing the dried low-rank coals input in a pyrolysis device by utilizing the hypoxic gas supplied by a second combustion chamber; separating the pyrolysis gas generated by the pyrolysis device; and respectively transporting combustible gas obtained by separating the pyrolysis gas to the first combustion chamber and the second combustion chamber to be used as combustion gas for recycle. In the device, a combustion device respectively supplies the hypoxic gas to the drying device and the pyrolysis device through the first combustion chamber and the second combustion chamber which are mutually independent; the combustible gas obtained by separating the pyrolysis gas is respectively transported to the first combustion chamber and the second combustion chamber to be cycled as the combustion gas. The invention lowers the energy consumption, effectively controls local combustion and temperature in the drying device and the pyrolysis device and reduces the environmental pollution.

The invention discloses a co-mining tunneling method of seam roadway gas. The port of a roadway is sealed to form a sealed space, therefore air outside the roadway can not enter the space, so that the concentration of the gas in the roadway is above 20%, the concentration of the oxygen in the roadway is lower than 12%, and gas loses explosion capability. A drawing pipe is connected to release high-concentration gas released in a working space. In order to prevent high pressure from forming when coal and gas extrude in the roadway, a circular arc-shaped pressure relief roadway is dug on the opening end of the roadway, and high-pressure gas generated by extrusion can be removed. An air conditioning system is arranged in the roadway to guarantee proper environment in the roadway, and workerswork in the sealed space under the condition of prepared safety protection. By utilizing the roadway tunneling method, the problem of gas explosion is fundamentally solved, fire hazard danger is alsoeliminated, and the damage to a human body caused by respirable dust is eliminated; and meanwhile, because the roadway does not have explosion danger, so that the co-mining tunneling method provided by the invention has no anti-explosion requirement on equipment, and has a good popularization value.

The invention discloses an ionic current based spark ignition engine preignition detection control device. Before an ionic current detection device detects spark ignition, autoignition happens in a combustion chamber, an ethanol solenoid valve is controlled in the compression stroke to be turned on to inject a certain amount of ethanol so as to lower the temperature in the combustion chamber and restrain preignition, and the ethanol solenoid valve and a gasoline solenoid valve are controlled to be turned on simultaneously according to gasoline injection pulse width in subsequent circulation, so that the ethanol is mixed in gasoline, and preignition tendency in the subsequent combustion circulation is reduced; if preignition happens continuously, the ethanol is injected in the compression stroke, if preignition does not happen in the subsequent circulation, ethanol injection amount in fuel is decreased along with circulation, and finally pure-gasoline injection is restored. The ionic current based spark ignition engine preignition detection control device has the advantages that when one cylinder is detected to be pre-ignited, fuels such as the ethanol with high latent heat of vaporization are injected into the cylinder so as to cool compressed mixed gas, the temperature in the combustion chamber at upper dead point of compression is lowered, non-combusted mixed gas is restrained from autoignition, super detonation caused by preignition is prevented, and damage to an engine is reduced.

The invention provides an automatic remote control extinguishing device for an automobile, which belongs to technology of vehicle design and manufacture and technology of fire prevention and fire fighting, and in particular relates to the technology of fire prevention and fire fighting of running automobiles. The device is characterized in that an air duct is wound on the periphery of a cover cap of an automobile engine; gas orifices towards the engine are uniformly distributed along the air duct; the air duct is connected with a jet orifice of an extinguisher through a hose; and a relay controlled by infrared ray is arranged on a control end of the extinguisher, is on a position within drivers reach, and is provided with an infrared launch button with a protective cover. The device has the advantages that the vehicular automatic remote control extinguishing device is arranged on the automobile, so when the automobile smokes and has a risk for fire, the automobile can realize automatic extinguishing only by pressing a remote control switch by the driver, and a crowd and chaotic occasion that passengers and the driver scramble for the extinguisher to extinguish fire is avoided. The method provides an effective measure for fire prevention of the automobile in China.

The invention relates to the field of coal mine acquisition technology and specifically relates to coal mine underworkings-type coal-seam gas fracturing equipment. An underground coal body (5) is connected with one end of each of a plurality of high pressure fracturing pumps (4) through high-low pressure manifolds (6); the other end of each of the plurality of the high pressure fracturing pumps (4) is connected with a fracturing-liquid mixing and proportioning mixer (2) through the high-low pressure manifolds (6); one end of the fracturing-liquid mixing and proportioning mixer (2) is connected with a plurality of liquid storage tanks (1) through the high-low pressure manifolds (6); and a lower end of the fracturing-liquid mixing and proportioning mixer(2) is connected with a control monitoring device(3). The coal mine underworkings-type coal-seam gas fracturing equipment is used for fracturing coal seams, can assist in improving coal seam permeability and can assist in reducing rock bursts of a coal body fracturing area and reducing risks of coal and gas outbursts and the rock bursts at a working face.

Disclosed are a magnesium (Mg) alloy and a manufacturing method thereof. The Mg alloy has a composition including, by weight, 4% to 10% of Sn, 0.05% to 1.0% of Ca, 0.1% to 2% of at least one element selected from the group including Y and Er, the balance of Mg, and the other unavoidable impurities. The Mg alloy includes an Mg2Sn phase having excellent thermal stability, and is capable of being heat treated at a temperature of 480° C. or more.

The invention relates to a flue gas displacement reinforced goaf gas extraction and goaf fire preventing and controlling method. The flue gas displacement reinforced goaf gas extraction and goaf firepreventing and controlling method is suitable for underground use of a coal mine, and comprises the steps that during the stoping process, a rock stratum above a goaf is broken and moved, an annular fracture zone is formed at the position of a caving arch, gas released in the stoping process is enriched, and gas injection pipelines are arranged on a roadside of the outer side of an air inlet lanein a paved mode and buried into the goaf; a drilling field is arranged at one side of an air return lane, pumping and extracting drilling holes are formed in from a drilling field to the caving arch position of the goaf, factory waste flue gas is injected into the goaf through the gas injection pipelines, and the gas enriched in the fracture zone is pumped and extracted through the pumping and extracting drilling holes; the flue gas is used for inhibiting the spontaneous combustion of residual coal in the goaf, the flue gas is injected into the goaf to balance the air pressure in the goaf by using belt pressure, and the air leakage of a working surface to the goaf is weakened; and flue gas is used for replacing, displacing and lifting the gas in the residual coal and surrounding rock to float to the fracture zone, and the gas pumping and extracting amount and the gas pumping and extracting concentration in the pumping and extracting drilling holes are improved to achieve the effects ofthe prevention and control of the fire in the goaf and improving the quality of the gas pumping and extracting.

The invention discloses a novel hydrogel coal field fire preventing and extinguishing material, which is prepared by mixing a fire preventing and extinguishing dry material and water according to a material-water mass ratio of 2-3:100; wherein the fire preventing and extinguishing dry material is prepared from the following components in percentage by mass: 80 to 85 percent of composite environment-friendly hydrogel material, 5 to 10 percent of composite anti-enzyme preservative and 10 to 15 percent of composite halogen salt; the composite environment-friendly hydrogel material is prepared from the following components in percentage by mass: 40 to 60 percent of instant polyanionic cellulose, 0.5 to 1.5 percent of high-viscosity polyacrylamide and 38.5 to 58.5 percent of super absorbent resin; the compound type anti-enzyme preservative is prepared from the following components in percentage by mass: 30 to 40 percent of calcium propionate, 15 to 30 percent of potassium sorbate, 15 to 20percent of calcium benzoate and 15 to 30 percent of dehydroacetic acid. The novel hydrogel coal field fire prevention and extinguishing material provided by the invention has good water retention performance, which forms a waterproof film with a certain thickness on the surface of a coal body, so that the product can quickly reduce the temperature of a coal field fire area, and effectively prevents air flow, so that spontaneous combustion of coal is inhibited.