338 results about "Explosion hazard" patented technology

A fiber optic polarimetric strain sensor and associated data acquisition system capable of all-optical measurements of physical parameters, such as structural strain, gas and liquid pressure, acceleration and vibration, gas and liquid flow rate, and force without fire and explosion hazards associated with conventional strain gage technologies, such as resistance foil strain gages. The polarimetric strain sensor houses a sensitive element—a length of single mode optic fiber—changing polarization of a single-mode optical signal running in the fiber under some mechanical affects, specifically twisting and radial compressing. A linearly-polarized light passes the sensor, which causes polarization deviation of the light, particularly, polarization plane rotation under mentioned above twisting or compressive stresses applied to a sensitive element of the sensor. A multi-channel time division multiplexing data acquisition system that includes polarization analyzer indicates the polarization state deviation caused by the strain, so allow measuring the parameters. The invention may be embodied for measurements of any phenomenon that can be transformed in stress on an optical fiber.

An intrinsically safe, self-contained toxic gas removal and air conditioning system for use in an underground mine environment to continuously remove from air sealed in the chamber the CO₂ and/or CO from exhalations of up to thirty adult occupants. The system includes an explosion-proof/fire-proof shell strong enough to withstand a 15 psi explosion outside the survival chamber in which the air-scrubbing system is installed. In the event of normal power loss, the system runs on an internal battery capable of 96+ hours of continuous operation while incapable of creating an explosion hazard. A fan motor mounted inside the external shell is driven by a fan driver circuit and is coupled to a driveshaft extending outside the external shell to drive an air scrubber fan. A fan driver/controller circuit powers the fan and detects the loss of externally-provided AC power to automatically start operation when such power loss is detected.

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.

The invention discloses a movable ignition system for UCG (underground coal gasification), which comprises a movable ignition device, an overground gas supply system and a gas feeding pipe, wherein the movable ignition device is arranged on underground coal; the overground gas supply system is connected with the ignition device through a gas pipeline, and is used for supplying ignition gas for the ignition device from the ground through the gas pipeline; and the gas feeding pipe passes through a coal bed and communicates the underground coal with the overground coal, and is used for providing ignition air or oxygen for the underground coal from the ground. The ignition system disclosed by the invention can overcome a defect that a traditional igniter can not carry out secondary ignition quickly when a flameout phenomenon occurs in the process of gasification, and can move arbitrarily according to the needs of ignition in the process of gasification, thereby guaranteeing the continuity and timeliness of an ignition process, and saving time and labor; the movable ignition system can enlarge the scale of a gasification furnace, reduce the number of drilled wells, lower the production cost, and improve the production progress; especially for the underground gasification of deep and ultra-deep coal, the ignition system can significantly lower the operation cost; and due to a single gas pipeline design, the ignition process is safer, and the explosion hazard is reduced.

The invention discloses an air sac type jack comprising an upper top plate, a lower bottom plate, a rubber air sac and flanges; the lower bottom plate is connected with an external high-pressure air source through an air inlet pipe; two ends of the rubber air sac are respectively connected with the upper top plate and the lower bottom plate in a sealing way through the two flanges, and therefore, a sealed sac cavity is formed inside the rubber air sac; an air outlet is formed in the sac cavity; an air inlet passage is formed in the lower bottom plate; the air outlet communicates with the air inlet pipe through the air inlet passage; and the lower bottom plate is provided with a balance limiting device. The air inlet passage is arranged inside the lower bottom plate, so that the problem that the pressure bearing capacity is reduced because an air inlet device is arranged on the rubber air sac to result in nonuniform stress of the rubber air sac can be avoided. Therefore, the load which can be borne by the air sac type jack is large, and explosion hazards caused by rubber air sac perforation is not easily caused.

The invention discloses an antifogging agent for glass. The antifogging agent comprises the following raw materials in part by mass: 1 to 1.3 parts of fatty alcohol-polyoxyethylene ether, 0.2 to 0.3 part of sodium lauryl sulfate, 0.1 to 0.3 part of ethanol, 0.2 to 0.3 part of essence, 0.8 to 1 part of sodium silicate, 1.5 to 2 parts of saponin adhesive, and 90 to 95 parts of deionized water. The antifogging agent is easy to prepare, has a cleaning effect and an antifogging effect, and is long in antifogging time, wide in using rage, and convenient to carry; and explosion hazard is avoided.

The invention discloses a texturing additive for inverted pyramid textured monocrystalline silicon wafer and application thereof. The texturing additive comprises the following components: a nonionicsurfactant, a cationic surfactant, polyethylene glycol, an organic salt and the balance water. An alkali solution added with the texturing additive provided by the invention can be used for preparation of an inverted pyramid texture on a monocrystalline silicon wafer surface, catalysis of silver, copper and other precious metal ions is not needed, the texturing cost can be lowered, environmental pollution is reduced, therefore the texturing additive is more conducive to the process stability of crystalline silicon solar cells, and has good practical value. By using the alkali solution added with the texturing additive provided by the invention for texturing of a monocrystalline silicon wafer surface, a uniform, fine and dense textured inverted pyramid can be obtained. And the texturing additive provided by the invention does not contain isopropanol or ethanol, has no toxicity, corrosiveness, irritation, also has no burning or explosion hazard, and can avoid environmental pollution. Moreover, the manufacturing and use process of the texturing additive is simple, employs cheap equipment and has good repeatability.

A system and a method for active fire extinguishing and explosion suppression in coal mine workplaces are especially suitable for monitoring, early warning, and actively inserting and inhibiting in spaces that are prone to fire and explosion hazards, and the spaces comprise coal mine workplaces that generate gas and coal dust, and gas and coal dust accumulated areas in coal storage bunkers, and the like. Quantitative evaluation of environmental space explosion hazard degrees is obtained by the system through active monitoring and comprehensive evaluating of a plurality of parameters such as gas composition, dust concentrations, ambient temperature, photoelectric signals, etc. in a working environment, thereby providing theory criteria for action execution of explosion suppression mechanisms. According to the invention, real-time monitoring of environmental parameters of gas and coal dust in workplaces and advanced quantitative determination of explosion hazard degrees are realized, and therefore effective explosion suppression measures are adopted proactively before an explosion hazard occurs, and the probability of successful execution of explosion suppression is increased.

The invention relates to method and device for inhibiting detonation propagation of combustible substance. The method includes pre-installing (in tunnels or walls) multiple vacuum chamber units having sealed ends facing the spaces where explosion might happen. The vacuum chamber units have inner surfaces coated with wave/energy absorbing layer, and have sealed ends provided with weak panels capable of being broken by environmental pressure variations. When explosion happens, the vacuum chamber receives the explosion shock; the weak panels are broken, expansion air, explosion shock and energy are absorbed by the vacuum chamber, as the chamber is negative pressure and vacuum, it can absorb the explosion shock and energy to inhibit maximatily the detonation propagation of the explosion shock and energy, thereby damage is reduced.

Passive venting apparatus and method for a rocket motor or ordnance device containing propellant or explosive material enclosed in a case, which presents an explosion hazard when subjected to external heat. A combustible strip is secured to the exterior surface of the case and is constructed to burn and generate sufficient heat when exposed to predetermined external heat to weaken the adjacent portion of the case and effect rupture of the case to vent interior gases therein prior to autoignition of the propellant or explosive.

A flame-free aromatherapy essence catalyzing core includes a ceramic seat and an iron net tray. The invention is characterized that, the iron net tray is placed at an upper surface of the ceramic seat, and is filled with a tuft of platinum flameproof cotton thereon; and the ceramic seat is provided with a ceramic protection loop and a fastening apparatus for fixing the iron net tray and the platinum flameproof cotton to the upper surface of the ceramic seat. According to the aforesaid structure, the iron net tray and the platinum flameproof cotton effectively shield conductance of flammable objects and flames, and a flame-free heater is utilized to provide an essence with an appropriate temperature for evaporation. For that a dead flame instead of a live flame is adopted for producing medium combustion, explosion hazards are prevented and thereby obtaining a better overall safety.

The invention discloses a natural enteric soft capsule which comprises a soft capsule body and an enteric coating layer. The soft capsule body comprises content and a capsule shell; the content comprises the following raw materials as per parts by weight: 0.10 to 100.00 parts of active ingredient; the capsule shell comprises the following materials as per parts by weight: 20.00 to 30.00 parts of gelatin, 6.00 to 20.00 parts of capsule shell humectant, and 15.00 to 30.00 parts of water; and the enteric coating layer comprises the following materials as per parts by weight: 1.0 to 10.00 parts of film former, 1.0 to 10.00 parts of coating humectant, and 10.00 to 100.00 parts of water. The invention further discloses a preparation method of the natural enteric soft capsule. The natural enteric soft capsule has the benefits that firstly, main components of the natural enteric soft capsule pass the U.S. GRAS certification and can be safely applied to food and drug; secondly, coating material takes water as solvent, so that potential safety hazard, such as toxicity, inflammability, explosion hazard and the like, does not exist, and the production is safer; thirdly, a coating film of the enteric coating soft capsule has more tenacity and better adhesive force, and the stability is better during long-term storage; and the coating film is not cracked and falls off when being vibrated, impacted or squeezed.

A multiply-redundant system that protects fueling of rockets, aircraft and other vehicles using Liquefied Natural Gas (LNG) along with an oxidizer such as Liquefied Oxygen. One or more sensors in combination with one or more optional microswitches combine to detect any leaks, fire or explosion hazards quickly locking out further fueling. For different levels of safety, different combinations of sensors can be used.

Lightweight energy-consuming bulletproof and explosion-proof wall, including corrugated steel plate, steel wire mesh, bulletproof plate, light-weight crack-resistant concrete and polymer coating. Connected by steel wire mesh connectors of corrugated steel plates, light energy-consuming materials are poured inside the corrugated steel plates, light elastic materials are poured between the corrugated steel plates and the steel mesh, the outer side of the steel mesh is provided with a bulletproof plate, and the outer side of the bulletproof plate is poured with light weight Crack-resistant concrete, the outer side of the lightweight crack-resistant concrete is sprayed with a polymer coating. The beneficial effects of the invention are: good bulletproof effect, strong anti-explosion ability, large deformation ability, high anti-cracking ability, light weight, maximum absorption of blast impact energy, effective prevention of secondary damage caused by explosive fragments, good explosion-proof effect, energy Significantly control explosion disasters and improve defense capabilities.

The invention discloses a static blasting fracturing method used for exploitation of shale gas and other low permeability oil and gas reservoirs. The method includes the steps that a producing well is drilled to an oil and gas reservoir, and after well cementation, perforation or drilling is conducted on a production horizon to obtain an expansion hole; a blasting agent wrapped by a biodegradable film is put into the well, and carried by a hydrolytic enzyme solution to the expansion hole; under the action of the hydrolytic enzyme, the biodegradable film is hydrolyzed and then releases the blasting agent, the size of the blasting agent expands continuously after the blasting agent reacts with water and generates expansion pressure to continuously fracture the reservoir, so that cracks are formed; the fracturing is repeated for one to two times, the cracks are expanded through expansion stress, new cracks are extended out, and the cracks become a communicated crack network. Environment-friendly type non-explosion dangerous goods are used as the blasting material, purchasing, transporting and storing are safe and reliable, and using is convenient; when the method is used for fracturing and transforming the oil and gas reservoir, the action time of one-time fracturing is long, the acting efficiency is high, a communicated crack network channel can be formed through repeated fracturing, and the method is good in fracturing effect, low in fracturing cost and wide in application range.

A connecting apparatus for field devices in an explosion-hazard zone, comprising an input terminal area for a first connecting line, an output terminal area for a second connecting line, a covering device for protecting at least one of the terminal areas, a first switching element for passing an electric current from the input terminal area to the output terminal area, a control unit for controlling the first switching element, a first sensor device that detects opening of the covering device, where the first sensor device is connected to the control unit and the control unit is configured to operate the first switching element.

The invention relates to a method for preparing alkaline hydrogen peroxide in situ, which is used for taking hydrogen, oxygen and an alkaline solution as raw materials to prepare an alkaline hydrogen peroxide water solution by direct electrocatalysis in situ. The preparing method adopts a membrane reactor, the oxygen and the hydrogen enter cathode and anode by the air inlets of a cathode end plate and an anode end plate and generate electrochemical reaction on the gas diffusion electrode loading with nano electro-catalyst, and the obtained product rapidly enters an electrolyte solution to be beneficial to the enrichment of the hydrogen peroxide. The middle adopts a cation-exchange membrane, so the explosion hazard of direct reaction of the hydrogen and the oxygen is avoided, and the safety is high. The volume of the reactor is small, and the product can be simply separated from reactants. Adopting the gas diffusion electrode loading with the nano electro-catalyst, the preparing method effectively increases the three-phase reaction interface, improves the utilization ratio of the catalyst, and increases the reaction rate. The use of the nano electro-catalyst can effectively reduce the over potential of reaction and energy consumption.

The invention provides a gas-solid two-phase jet type active fire resistance and explosion suppression method, which is suitable for fire resistance and explosion suppression in industrial pipelines used for conveying combustible gases with explosive risks and is also suitable for explosion suppression in lanes in the case of underground coal mine gas explosion. Two flame sensors and two powder storage pipes are arranged on the outer wall surface of a pipeline, an ABC powder extinguishing agent fills up the powder storage pipes, in the case of combustible gas combustion or explosion in the pipeline, the flame sensors can be used for detecting flame signals and transmitting the flame signals to a collector, the collector outputs a signal to a controller, the controller sends a command to drive a solenoid valve to open, after the solenoid valve is open, high pressure nitrogen in a high pressure nitrogen source is sprayed into the pipeline together with the ABC powder extinguishing agent by means of a pressure relief valve, the solenoid valve and the powder storage pipes, so as to form a high pressure gas-solid two-phase jet curtain to quickly extinguish the flame and prevent the continuous spread of combustion or explosion. By adopting the method, the problem that the existing explosion suppression facilities cannot prevent spread of multiple times of explosion and cannot dilute harmful gases is solved.

The invention relates to a self-heating agent for article heating and a self-heating agent package. The self-heating agent consists of a component A and water, wherein the component A consists of 10 parts by weight of calcium oxide, 3-10 parts by weight of anhydrous magnesium sulfate and 1-20 parts by weight of auxiliary materials, and the ratio of the component A to water is 1:(1-3.5). Even if the self-heating agent disclosed by the invention is arranged in a closed container or package, an explosion hazard is avoided, and the safety is high. The self-heating agent package disclosed by the invention comprises a self-heating agent packaging bag, a first space, a second space and a separator, wherein the first space is formed in the self-heating agent packaging bag and is used for containing water; the second space is formed in the self-heating agent packaging bag and is used for containing the self-heating agent for article heating disclosed by the invention; and the separator is arranged between the first space and the second space and is used for separating from or communicating with the first space and the second space when needed. The self-heating agent for article heating and the self-heating agent package disclosed by the invention are low in cost, good in effect, convenient to use, safe, environment-friendly and easy to popularize.

Apparatuses are disclosed for three-dimensionally printing reactive materials which utilize a powder spreading step followed by a binder-jet deposition step. Some such apparatuses include a binder jet three-dimensional printing device, a curing device, and a depowdering device contained within an environmental enclosure which provides an inert atmosphere sufficient to allow a reactive material to be used as a build material without fire or explosion hazards. Some such apparatuses include one or more conveying systems for moving a removable build box among the various devices. Environmental enclosures having unique designs and features are disclosed.

A modified compressed gas cylinder for use in hydrogen powered vehicles which lessens the explosive danger from accidental collisions by using an electronic signal from the airbag system to open a normally closed pressure relief valve. The released hydrogen gas releases through a vent pipe which exits either through the fill pipe area or through a vent in the top of the automobile. A whistle on the vent pipe informs drivers, passengers and bystanders if the pressure relief valve is allowing the escape of hydrogen gas. A mechanical lever maintains the open position of the pressure relief valve once the airbag signal is received until the driver triggers a mechanical latch similar to a trunk release which returns the pressure relief valve to its normally closed position. The pressure relief valve can also open if for some reason the internal pressure of the hydrogen storage tank exceeds the appropriate safety level due to excess density and or temperature rise.