19 results about "Methane combustion" patented technology

The invention provides rare earth based hexaaluminate, a preparation method thereof and a methane combustion catalyst. The general formula of the rare earth based hexaaluminate is AByAl12-yO19, A is a rare earth element and / or an alkaline earth metal element, B is a transition metal element, and y is more than 0 and less than 12. By introducing the rare earth element and / or alkaline earth metal, the stability of a hexaaluminate skeleton is enhanced, and the high temperature resistance of the hexaaluminate skeleton is further improved; and meanwhile, the transition metal is used for partially replacing Al < 3 + >, so that the catalyst has better high-temperature catalytic activity when being applied to catalytic methane combustion, and the methane catalytic combustion reaction temperature can be obviously reduced.

This invention discloses a method for methane extraction and closed-loop carbon fixation in coal seams using hot flue gas-driven combustion-explosion fracturing. First, each horizontal branch well is divided into sections, and perforations are constructed in each section. Then, CH4 is used in each section. 4 Combustion-explosive fracturing technology utilizes in-situ synergistic combustion-explosion reactions to generate gas impact perforation fractures, allowing them to further develop and expand into a fracture network. Then, hot flue gas is sequentially injected into each horizontal branch well. Due to its high temperature, the hot flue gas promotes CH4 (chemical oxygen demand) in the coal seam. 4 Gas desorption, and CO in hot flue gas 2 SO 2 NO 2 Due to its competitive adsorption advantage, it can displace a large amount of CH4 adsorbed in extra-thick coal seams. 4 Gas, then hot flue gas and CH 4 The gas continues to be utilized in a closed loop, improving the efficiency of coal seam methane extraction while simultaneously achieving hot flue gas sequestration. Through this continuous closed-loop utilization process, the efficiency of methane combustion and fracturing, hot flue gas sequestration, and CH4 extraction in various areas of extra-thick coal seams is maximized. 4 Extraction efficiency.

The application provides a kind of pyrolysis furnace low nitrogen combustion multi-objective optimization method, optimization system and storage medium.The multi-objective optimization method includes the following steps: establishing the turbulent combustion coupling model describing the flow and fuel combustion condition of the target pyrolysis furnace flue gas;Simplify the methane combustion mechanism of the turbulent combustion coupling model to obtain a simplified model describing the simplified mechanism of combustion reaction kinetics;Determine the input variables and output variables of the proxy model for predicting NOx emissions and flue heat efficiency;Obtain experimental sample points about the input variables and the output variables, and obtain the corresponding simulation results;Based on the experimental sample points and the simulation results, the proxy model is established via radial basis neural network;And the NSGA-II algorithm is used for multi-objective optimization of pyrolysis furnace low nitrogen combustion to determine the optimized input variable parameters balancing nitrogen emissions and thermal efficiency.

An apparatus and method are provided for reducing methane emissions from ruminant animals by combusting methane gas extracted from the rumen. The system comprises a conduit configured to transport methane from the animal's rumen to a combustion module mounted externally or implanted partially or fully in a subdorsal position. The combustion module includes a pressure-activated valve, air intake, ignition system, and combustion chamber enclosed by a heat-absorbing roof structure. A control unit monitors internal gas pressure and triggers a spark ignition circuit when combustion conditions are satisfied. An upward-facing camera inhibits ignition if flammable obstructions are detected above the module. A water-filled thermal buffer integrated into the chamber roof moderates exhaust temperature, reducing wildfire risk. Power is supplied by a solar panel and rechargeable battery. The system intermittently converts methane into carbon dioxide and water vapor, significantly mitigating the greenhouse gas impact of enteric fermentation in ruminant livestock.

The present application relates to a kind of palladium-based methane combustion catalyst and its preparation method and application, the preparation method includes the following steps: after obtaining mixed sol by mixing titanium source, cerium source and complexing agent, evaporate, dry and sinter in sequence, obtain cerium titanium carrier;The palladium-based methane combustion catalyst is obtained by impregnating mixed cerium titanium carrier and palladium source, and then drying and calcining in sequence.The preparation method of the present application is simple, and raw materials are cheap and easy to obtain.The palladium-based methane combustion catalyst prepared has low light-off temperature, and has water resistance, which can be applied to the treatment of methane in tail gas.

This invention belongs to the field of methane combustion catalyst technology, specifically relating to a cobalt-aluminum composite material, its preparation method, and its application. The cobalt-aluminum composite material is a composite oxide of cobalt and aluminum, wherein the molar ratio of cobalt to aluminum is 1–11:1. This invention uses a wet grinding method with ethanol to mix and grind cobalt salt and aluminum salt precursors, followed by drying and calcination to obtain the composite material. This preparation method is green and simple. The resulting composite material exhibits high activity for the catalytic combustion of low-concentration methane (volume concentration ≤1%), particularly excellent sulfur resistance; its activity decreases slowly and can partially recover in a sulfur dioxide atmosphere, making it suitable for the catalytic purification of methane in industrial waste gas.

This invention discloses a highly stable methane combustion catalyst and its preparation method, belonging to the field of energy and environmental technology. The invention first prepares a Ti-doped CeO2 composite oxide as a support, then loads it with a non-precious metal Mn-Co based solid solution, adds urea, and grinds the mixture to obtain the catalyst. This invention is not only simple, green, and efficient, but also fully utilizes the synergistic effect between the non-precious metal Mn-Co based solid solution catalyst and the support, significantly improving low-temperature catalytic activity, selectivity, and high heat and poisoning resistance. Furthermore, the catalyst can be recovered and reused, which is beneficial for resource recycling and cost reduction. The catalyst prepared by this invention has advantages such as convenient operation and high conversion rate in low-concentration methane combustion reactions.

A kind of methane in-situ combustion fracturing system and method based on shock wave ignition, system: shock tube assembly includes pressure-bearing pipe body;Clamp one and two are clamped in diaphragm one and two inside pressure-bearing pipe body;Gas filling assembly includes high-pressure gas tank, high-pressure and double-membrane gas supply pipeline connected with high-pressure gas tank respectively communicate high-pressure and double-membrane chamber;Exhaust assembly includes vacuum pump, vacuum pump connected with the vacuum pumping pipeline is communicated with high-pressure and double-membrane chamber through communication pipeline one and two respectively, double-membrane exhaust pipeline is communicated with communication pipeline two;Methane combustion and explosion packer unit is the packer of being installed on pressure-bearing pipe body;Combustion-supporting agent delivery unit includes oxygen cylinder, oxygen delivery pipeline connected with oxygen cylinder communicates combustion chamber;Combustible gas concentration detector is located on oxygen delivery pipeline;Method: shock tube assembly is assembled and is lowered;High-pressure and double-membrane chamber is vacuumized;Gas is filled;Fast pressure relief;The shock wave generated is ignited and expanded into combustion and explosion.The ignition energy of the present application is high, and the combustion and explosion effect is ideal.

The present invention relates to a methane combustion catalyst including platinum and iridium supported on a tin oxide carrier for combusting methane in a combustion exhaust gas containing sulfur oxide. In the methane combustion catalyst, a ratio RTO of platinum oxides to metal platinum is 8.00 or more, wherein the ratio RTO is based on existence percentages of the metal platinum (Pt) and the platinum oxides (PtO and PtO2) obtained from a platinum 4f spectrum analyzed and measured by X-ray photoelectron spectroscopy (XPS) and calculated in accordance with the following expression. In the following expression, RPt is an existence percentage of the metal platinum (Pt), RPto is an existence percentage of PtO, and RPto2 is an existence percentage of PtO2.RTO=(RPtO+RPtO2) / RPt  [Expression 1]

The present invention relates to a Pt / SnO2-based methane combustion catalyst for combusting methane in a combustion exhaust gas containing sulfur oxides, the methane combustion catalyst being configured such that platinum and / or platinum oxide is supported on a tin oxide-based carrier containing tin oxide as an essential component. In the methane combustion catalyst according to the present invention, the tin oxide-based carrier comprises antimony-doped tin oxide (ATO). At this time, the doping amount of antimony in the tin oxide-based carrier is preferably 0.1-5.0 mass%. In the present invention, the antimony doped in tin oxide improves the ability of the tin oxide to supply oxygen to platinum and the like. As a result, the activity and durability of the methane combustion catalyst can be improved. The Pt / SnO2-based methane combustion catalyst is highly active and excellent in durability even without the additional carrying of iridium or without the application of an overcoat layer.

The present invention relates to a process for obtaining metal supported catalysts, as well as the metal supported catalysts themselves, for methane combustion under wet conditions. The invention also relates to the use of said metal supported catalyst in methane combustion, preferably in methane combustion under wet conditions. Furthermore, the invention relates to a process for the combustion of methane under wet conditions, which involves the use of the metal supported catalyst according to the invention.

This invention discloses an M1Co3Ni6O for low-temperature catalytic combustion of methane. x A method for preparing a composite metal oxide catalyst, wherein the catalytic combustion reaction of methane is carried out at a temperature range of 250–500 °C under normal pressure. The preparation method includes the following steps: Step 1, synthesis of a mixed metal ion solution L1; Step 2, preparation of an alkaline ammonium carbonate solution L2; Step 3, titration of solutions L1 and L2; Step 4, M1Co3Ni6O x Synthesis of composite metal oxides. The catalyst prepared by this invention exhibits superior methane combustion catalytic activity, structural stability, and strong resistance to sintering. The M1Co3Ni6O prepared by this invention... x Composite metal oxide materials are used as catalysts for the low-temperature catalytic combustion of methane to further improve the methane conversion rate and the selectivity of CO2 products.

This invention discloses a production system for preparing carbon nanotubes using a mixed carbon source, relating to the field of nanomaterial preparation technology. The system includes a carbon dioxide capture unit and a carbon nanotube preparation unit. The carbon dioxide outlet pipe of the carbon dioxide capture unit is connected to the carbon source inlet pipe of the carbon nanotube preparation unit. A methane combustion chamber is connected to the front end of the carbon dioxide capture unit, which is connected to a compressor and a gas turbine. The carbon-containing flue gas produced after burning methane in the methane combustion chamber enters the carbon dioxide capture unit. The heat generated during combustion is used to heat the carbon dioxide capture unit, and the gas turbine powers the heating structure in the carbon nanotube preparation unit. This system utilizes the heat energy generated from methane combustion in the methane combustion chamber to heat the carbon dioxide capture unit and power the heating structure of the carbon nanotube preparation unit via the gas turbine, achieving full energy utilization and reducing energy consumption.

The present application belongs to the technical field of coal mining monitoring analysis and control, and specifically discloses a remote visual coal mining monitoring analysis and control system, which comprises a cutting area monitoring module, a cutting track generating module, an obstacle avoidance track generating module, a database and a cutting correction executing module. The present application constructs a three-dimensional geological model by fusing multi-source geological data such as methane concentration distribution, fissure density and rock hardness, realizes accurate identification of methane accumulation area, fissure expansion risk and hard rock mutation, predicts methane diffusion path in combination with wind speed and direction data, significantly reduces the incidence of methane combustion and explosion accidents, reduces the safety warning response time, simultaneously corrects the obstacle avoidance of the spatial boundary of the methane accumulation area by monitoring the methane concentration distribution data of the cutting track prediction path of the roadheader during operation in real time, and generates an obstacle avoidance cutting track, accurately defines the three-dimensional spatial range of the methane accumulation area, and avoids the risk of the cutting head of the roadheader entering the risk area.

The application discloses a method for hot flue gas displacement and closed-loop carbon sequestration of superimposed coal seam methane extraction, which adopts CH4 combustion and explosion fracturing technology to generate gas impact fracturing coal seam section to form a crack network in situ in each coal seam section, then hot flue gas is injected into each coal seam section, the high temperature of the hot flue gas can promote the desorption of CH4 gas in the coal body, and CO2, SO2 and NO2 in the hot flue gas can replace a large amount of CH4 gas adsorbed in the superimposed coal seam due to the competitive adsorption advantage and closed-loop utilization, thereby realizing the hot flue gas storage and improving the coal seam methane extraction efficiency. In addition, the multi-source monitoring data inversion and intelligent control system can design the best combustion and explosion gas injection parameters and the best hot flue gas injection parameters according to the changes of the physical parameters of the current different coal seam sections, thereby performing layered dynamic and accurate regulation and control on the gas injection parameters of each coal seam section, and maximizing the methane combustion and explosion fracturing, hot flue gas storage and CH4 extraction efficiency of each coal seam section of the superimposed coal seam.

The invention provides a water-resistant methane combustion catalyst and a preparation method and application thereof.The water-resistant methane combustion catalyst comprises active components and a carrier, the active components comprise Pd and Pt, the carrier comprises inorganic matter modified by metal elements and / or non-metal elements, the metal elements comprise Ti and / or rare earth elements, and the inorganic matter modified by metal elements and / or non-metal elements comprises inorganic matter modified by metal elements and / or non-metal elements. The non-metallic element comprises Si; the inorganic matter comprises aluminum oxide and / or boehmite. According to the water-resistant methane combustion catalyst disclosed by the invention, Pd and Pt are used as active components, and metal and / or nonmetal modified aluminum oxide is used as a carrier, so that the methane combustion catalyst has excellent water resistance, long service life, stability and low-temperature performance, and the water-resistant methane combustion catalyst can be industrially produced and applied on a large scale.

The invention discloses a cation modified silane surface modified carrier loaded monatomic noble metal catalyst, a preparation method thereof and application of the cation modified silane surface modified carrier loaded monatomic noble metal catalyst in catalysis of methane combustion. The preparation method comprises the following steps: fully displacing cations into a carrier through ion exchange to obtain a first intermediate product; modifying the surface of the first intermediate product by using long-chain silane to obtain a second intermediate product; and placing the second intermediate product in a noble metal precursor solution, uniformly mixing, standing and aging, enabling the noble metal and the long-chain silane on the second intermediate product to generate strong precursor-carrier interaction, then carrying out solid-liquid separation, taking the solid, washing, drying and calcining to obtain the cation modified silane surface modified carrier loaded monatomic noble metal catalyst.

The invention discloses a moon night survival system based on liquid oxygen methane combustion heat exchange, and relates to the field of moon exploration. The residual liquid oxygen methane propellant after the lunar landing of the lander is used for combustion heat exchange, and the temperature of the heat preservation cabin is maintained within the range of-20 DEG C to 40 DEG C through intermittent combustion and a temperature zone maintaining working mode. The system comprises a low-temperature propellant storage box, a high-pressure self-locking valve, a constant flow valve, a low-temperature heat exchanger, a combustion heat exchanger, a gravity-driven two-phase fluid loop, a low-temperature self-locking valve, a heat preservation cabin and the like, energy conversion and temperature control are achieved through combustion heat exchange and the gravity-driven two-phase fluid loop, and the problem of shortage of living energy at the moon night is effectively solved.