9 results about "Minimum ignition energy" patented technology

The invention discloses a hydrogen leakage diffusion non-uniform concentration gradient gas cloud minimum ignition energy test and blast-to-pedigree experiment device and an experiment method thereof. Comprising a visual semi-open test chamber, a premixing and flow regulation and control system, a gas temperature regulation and control system, a flow field wind speed regulation and control system, an environment water mist regulation and control system, an adjustable high-pressure ignition system, a non-uniform hydrogen injection system, a data acquisition system, a program control system and a time sequence synchronous controller. According to the hydrogen leakage diffusion non-uniform concentration gradient gas cloud minimum ignition energy test and blast-to-pedigree experiment device, a plurality of gas cloud forms such as local enrichment or concentration gradient advancing along with time can be constructed through cooperation of the position-adjustable non-uniform hydrogen injection system and the premixing and flow regulation and control system, and the injection position and key parameters can be reproduced; and moreover, dynamic monitoring of concentration distribution can be realized through a data acquisition system, and a researcher is helped to establish a corresponding relation of the gas cloud concentration along with time and space changes.

A small-scale minimum ignition energy (MIE) testing system for estimating the MIE of a dust cloud includes a small-scale testing chamber, a supply conduit in fluid communication with a supply of test gas and defining an enclosable supply chamber having a target volume, a dispersion nozzle fluidically connected between the supply conduit and the small-scale testing chamber for receiving a sample dust, a control valve positioned along the supply conduit between the enclosable supply chamber and the dispersion nozzle, the control valve having a closed state that restricts fluid communication between the supply chamber and the small-scale testing chamber and an open state providing fluid communication between the supply chamber and the small-scale testing chamber, and a pair of electrodes coupled to the small-scale testing chamber.

The invention relates to a liquid oxygen methane semi-system engine ground test, in particular to a liquid oxygen methane semi-system engine ground test system capable of achieving methane-rich gas safety treatment and a design method of the liquid oxygen methane semi-system engine ground test system. According to the system, on the basis of a traditional test bed, a methane-rich gas leading-out pipeline optimized through fluid-solid coupling simulation and an igniter accurately positioned based on a flow field simulation and minimum ignition energy theory are creatively integrated. The structure of a discharge pipeline is optimized, the conveying safety of the discharge pipeline is ensured, an outlet flow field is accurately simulated, the optimal installation position and angle of an igniter are determined in combination with theoretical calculation, and therefore reliable ignition and safe disposal of methane-rich gas in an open space are achieved. According to the invention, the problem of safe emission caused by high chemical activity and unstable state of methane-rich gas in the liquid oxygen methane semi-system engine ground test is effectively solved, and the safety and reliability of the test bed are remarkably improved.

The utility model discloses a kind of combustion device and combustion system, comprising: hearth, hearth provides space for material combustion;Primary air chamber, primary air chamber is used to form primary air;Air distribution plate, hearth is communicated with primary air chamber by air distribution plate;Ammonia gas pipeline, ammonia gas pipeline is located in hearth and close to air distribution plate;Ammonia gas air cap, ammonia gas air cap is used to communicate ammonia gas pipeline and hearth, and the gas in the hearth is guided, the surface of ammonia gas air cap has ammonia cracking catalyst layer, ammonia cracking catalyst layer can at least part of ammonia gas that passes through ammonia gas air cap is cracked into nitrogen and hydrogen. Since the minimum ignition energy of hydrogen is lower than that of ammonia and the combustion temperature is high, hydrogen is more easily combusted than ammonia, which can improve the combustion characteristics in the hearth and enhance the effect of ammonia combustion, thereby reducing ammonia escape, while allowing more ammonia to react with nitrogen oxides, achieving the purpose of inhibiting the formation of nitrogen oxides.

The invention discloses a dust explosion risk assessment method, device and equipment and a computer readable storage medium, and the dust explosion risk assessment method comprises the steps: obtaining a sensitivity parameter and a severity parameter of target dust in a current environment, and a reference sensitivity parameter and a reference severity parameter of standard reference dust; the sensitivity parameters at least comprise the minimum ignition energy corresponding to the target dust, the minimum ignition temperature of the dust cloud, the lower explosion limit concentration of the dust cloud and the minimum oxygen concentration for maintaining flame propagation in the dust cloud; performing comparison operation between the sensitivity parameter and the reference sensitivity parameter to obtain a relative sensitivity index, and performing comparison operation between the severity parameter and the reference severity parameter to obtain a relative severity index; and determining the explosion risk level of the target dust according to the relative sensitivity index and the relative severity index. More comprehensive relative sensitivity indexes of dust characteristic parameters are adopted, and the accuracy and reliability of explosion risk assessment are improved.

The utility model discloses a converter primary flue gas fire energy separator, which comprises a central air outlet cylinder body, an elliptical upper seal head, a straight cylinder section, a conical section, an ash bucket and a main support, the elliptical upper seal head is sleeved outside the central air outlet cylinder body, flue gas enters the straight cylinder section through an air inlet to generate high-speed rotating airflow, so that the flue gas is separated from particles with high fire energy, and the particles with high fire energy are separated from the main support. The separated flue gas enters subsequent equipment through the central air outlet barrel, and the separated fire energy particles enter the ash hopper through the conical section and then are discharged through the double-layer flap valve. After the flue gas passes through the fire energy separator, the ignition energy in the flue gas is smaller than the minimum ignition energy of the converter gas, high-energy kindling is effectively separated, the danger of flash explosion of the converter gas is avoided, and the safety of the system is remarkably improved.

This application discloses a wing fuel tank and its manufacturing method. The wing fuel tank includes a beam plate, a skin, and ribs. The ribs are arranged sequentially at intervals along the length of the beam plate. The skin covers the beam plate and ribs, forming a sealed oil cavity between the skin, the beam plate, and the ribs. An energy-absorbing protective layer is disposed on the surface of the skin within the oil cavity. In this application, by providing an energy-absorbing protective layer on the inner surface of the oil cavity, during fuel tank use, static charges within the fuel tank continuously accumulate on the surface of the energy-absorbing protective layer, forming a double electric layer on the upper and lower surfaces of the energy-absorbing protective layer, constituting a capacitor for storing electrical energy. The electric field strength of the energy-absorbing protective layer capacitor is relatively small, insufficient to break down the energy-absorbing protective layer; therefore, the energy-absorbing protective layer can be used normally. The energy stored in the energy-absorbing protective layer capacitor is greater than the minimum ignition energy required by the fuel tank, increasing the energy threshold and achieving electrostatic protection.

The invention relates to the technical field of combustible dust explosion protection, in particular to a method and device for predicting the minimum ignition energy of combustible dust based on ISMA-LSTM, and the method comprises the steps: obtaining first data of to-be-detected combustible dust; performing cleaning, denoising and normalization processing on the first data to generate second data; inputting the second data into a pre-trained CNN to extract features, and constructing a minimum ignition energy feature set; the minimum ignition energy feature set is input into an ISMA-LSTM which is trained in advance, and the minimum ignition energy at the next moment is predicted; outputting the minimum ignition energy at the next moment; judging according to the minimum ignition energy; and generating early warning information. According to the method, the features are extracted through the CNN to construct the minimum ignition energy feature set, the minimum ignition energy feature set is input into the ISMA-LSTM, the minimum ignition energy at the next moment is predicted, the accuracy of minimum ignition energy prediction can be improved, and the explosion risk of combustible dust is reduced.

The application discloses a system for realizing hydrogen-doped natural gas jet fire experiment, which comprises a gas supply device, a mixing device, a jet combustion device, an observation device and a collection and control device. The gas supply device is used for sequentially conveying hydrogen and natural gas satisfying an experimental partial pressure to the mixing device according to a preset gas ratio and an experimental pressure containing partial pressure information. The mixing device is used for mixing hydrogen and natural gas according to the experimental pressure. The jet combustion device is used for jetting and igniting the hydrogen-doped natural gas to form a jet fire. The observation device is used for capturing the changing state of the jet fire. The collection and control device is used for analyzing the jet fire characteristics under the current experimental condition according to the changing state of the jet fire. The application can study the minimum ignition energy and the jet fire characteristics of the hydrogen-doped natural gas under different hydrogen-doping ratios, different pressures, different leakage hole appearances and impurity influences.