157 results about "Methane production" patented technology

The invention relates to a shale or coal rock gas evaluation method based on a gas-water two-phase flow isotope fractionation model. The shale or coal rock gas evaluation method comprises the following steps: 1, collecting data; 2, establishing a gas well model; 3, establishing a control equation set; 4, coupling the influence of the real gas effect and the effective stress; 5, establishing a gas transmission model and a relative permeability model; 6, establishing a relation between capillary pressure and saturation; 7, considering critical desorption pressure; 8, setting boundary conditions of initial conditions; 9, solving a control equation set; 10, calculating production dynamic parameters and isotope values; 11, performing history fitting; 12, verifying historical fitting quality; 13, predicting productivity; 14, calculating a gas dynamic output proportion; 15, identifying a fractionation inflection point and gas production mechanism conversion; by coupling gas-water two-phase flow, multiple gas transmission mechanisms, stress sensitivity and methane isotope competitive adsorption theories, yield prediction of the deep reservoir and quantitative evaluation of the dynamic proportion of produced gas are realized.

The invention discloses a continuous kettle type nitromethane production process, and relates to the technical field of basic chemical raw material synthesis and flow chemical reaction process control, which comprises the following steps: quantitatively and continuously pumping a temperature-regulated sodium nitrite mixed solution into a raw material mixer in a closed-loop automatic control mode through a variable-frequency feeding pump matched with a mass flow meter; synchronously, quantitatively and continuously pumping dimethyl sulfate into the raw material mixer in a closed-loop automatic control manner by matching a feeding pump with a stop valve and a mass flow meter, and uniformly mixing the two raw materials in the raw material mixer according to the stoichiometric molar ratio of the dimethyl sulfate to the sodium nitrite, according to the tandem type segmented design, each reaction kettle can be subjected to customized temperature field control and heat transfer design specially aiming at the special thermodynamic and dynamic requirements of the reaction stage where the reaction kettle is located, the heat transfer efficiency of the whole system is greatly improved, and due to the fact that reaction heat is taken away timely and accurately, the heat transfer efficiency is greatly improved. And a by-product generation path induced by local abnormal high temperature is effectively restrained.

The invention discloses an electric methane preparation catalyst compounded by Ni nanoclusters and ZrO2 with lattice embedded with Ru single atoms as well as a preparation method and application of the electric methane preparation catalyst. The electric methane preparation catalyst comprises a NiNCRuSA / ZrO2 bimetallic active site catalyst compounded by the Ni nanoclusters and the ZrO2 with the lattice embedded with the Ru single atoms. The electric methane preparation catalyst comprises a NiNCRuSA / ZrO2 bimetallic active site catalyst, the NiNCRuSA / ZrO2 bimetallic active site catalyst is of a ZrO2 composite structure formed by embedding Ru monatomic into Ni nanoclusters and crystal lattices, the Ni nanoclusters and the Ru monatomic are adjacently distributed on a ZrO carrier to form a synergistic catalysis structure, rich and efficient active sites are provided for catalytic reaction, and reactant adsorption and conversion are facilitated; in the subsequent CO2 methanation reaction, the Ni element quickly dissociates H2 and provides sufficient H *, Ru replaces ZrO2 to serve as an active site for CO2 adsorption and conversion, conversion of an intermediate of CO2 can be accelerated, the reaction activity is greatly enhanced through cooperation of the Ni element and the Ru, the reaction energy barrier is reduced, and the overall catalytic efficiency is improved.

The invention belongs to the technical field of sludge treatment and recycling, and relates to a method for promoting anaerobic methane production by sludge through tubular pore structure biochar. Comprising the following steps: screening, washing, segmenting and drying a biomass material with a natural grade pore network, and then pyrolyzing and screening to obtain tubular pore structure biochar; carrying out sedimentation, sieving, dilution and pyrohydrolysis on the residual sludge to obtain pretreated sludge; mixing the pretreated sludge with the inoculated sludge to obtain mixed sludge; and adding the tubular pore structure biochar and the mixed sludge into an anaerobic reactor, aerating nitrogen in the anaerobic reactor, sealing the anaerobic reactor in a water bath constant-temperature oscillator, and carrying out methane production until no methane is generated in the anaerobic reactor. According to the method, the anaerobic methanogenesis efficiency of the residual sludge is remarkably improved by utilizing the tubular pore structure biochar, and the improvement of the anaerobic methanogenesis efficiency of the sludge under the mediation of the exogenous conductive material is realized.

The invention relates to the technical field of integrated energy system dispatching, in particular to an integrated energy system low-carbon dispatching method considering fuel gas hydrogen mixing and carbon transaction, which comprises the following steps of: constructing an integrated energy system model containing electric power, thermal power, natural gas and coupling equipment, and defining an electric hydrogen production process and an electric methane production process of power-to-gas equipment by the coupling equipment model; a fuel gas mixed hydrogen energy flow calculation model is constructed, a decomposition solution method is adopted for iterative convergence and dynamic calculation of a mixed fuel gas real-time heat value, and energy balance constraints are improved; constructing an optimal scheduling model considering the stepped carbon transaction, and taking the minimization of the total operation cost as a target; and applying hydrogen mixing proportion upper limit constraint, and cooperatively deciding power distribution and a hydrogen storage tank charging and discharging strategy through an optimization algorithm to solve a target function. According to the method, the energy flow calculation precision and the renewable energy consumption capability are improved, and collaborative optimization of system economy and environmental protection benefits is realized.

A method for producing methane with excellent methane selectivity is provided. [Solution] A method for producing methane using a carbon dioxide electrolysis cell including a carbon dioxide reduction electrode and an electrolyte, wherein the carbon dioxide reduction electrode has, in that order, a cathode gas diffusion layer and a cathode catalyst layer that has been treated to be water repellent, and the method includes step A of supplying carbon dioxide from the cathode gas diffusion layer side and water from the electrolyte side to the cathode catalyst layer of the carbon dioxide reduction electrode in a temperature environment exceeding 0°C and not exceeding 50°C, and applying electricity.

The invention discloses a method for improving methane production by anaerobic digestion through hydrothermal electrochemistry, which comprises the following steps: dispersing livestock and poultry manure by using a water solvent to obtain a raw material solution, carrying out anaerobic digestion treatment on the raw material solution under external voltage through an electrochemical anaerobic digestion system, and dehydrating the material solution subjected to anaerobic digestion to obtain a biogas residue solution with adjusted solid content, carrying out a heating hydrolysis reaction under a low-oxygen or anaerobic condition; after the hydrolysis reaction, the feed liquid is directly introduced into a flash tank, so that the pressure of the feed liquid is suddenly reduced, the temperature is reduced along with the room temperature environment, macromolecular substances are cracked into micromolecular substances under the flash evaporation effect, and then centrifugal treatment is performed to obtain biogas residue pyrohydrolysate and livestock and poultry manure biogas residues. The method provided by the invention not only can produce methane at high yield, but also enhances the degradation effect of organic matters in the raw material solution.

The application provides a kind of microbial population evolution monitoring method and device based on magnetic field intensity regulation, related to microbial monitoring field, through multi-source sensor real-time collection microbial community, methane production, magnetic field parameter and environmental working condition data, construct supervision data set, establish dynamics model containing magnetic field influence function, and adopt supervision learning to carry out parameter online identification and rolling prediction, finally through optimization algorithm real-time adjustment magnetic field parameter, realize the closed-loop optimization control of microbial permeability process.The application adopts the above-mentioned microbial population evolution monitoring method and device based on magnetic field intensity regulation, has the advantages of strong real-time, high interpretability, good engineering implementability, etc., is suitable for coal seam microbial permeability, coalbed gas production optimization and mine ecological process evaluation and other application scenarios.

The present application belongs to the field of biomass anaerobic digestion, and provides a two-phase integrated anaerobic digestion and exogenous particle recycling device.The device comprises a main reactor, an online liquid level control system, a gas collection system and a gas backflow stirring system, and the main reactor contains a hydrolysis acidification zone, an acid production buffer zone and a methane production zone.The hydrolysis acidification zone is provided with a hydrolysis acidification chamber, a stirring device, a hydrolysis acidification chamber sample discharge port and a sample inlet.The acid production buffer zone comprises an acid production buffer chamber and an improved three-way valve.The methane production zone comprises a methane production chamber sample discharge port, a gas distribution device, a methane production chamber, a PVC connecting pipe, a particle settling zone, an overflow sample discharge port, a partition, a particle settling zone sample discharge port, a baffle and a sludge discharge port.The two-phase integrated anaerobic digester in the present application separates the hydrolysis acidification zone and the methane production zone through an upper and lower layered anaerobic digestion tank, which is conducive to improving the organic load and volumetric gas production rate of the system, and the reactor structure is compact, reducing the floor area.

This invention provides an integrated treatment system for harvesting microalgae using recyclable magnetic nanoparticles while simultaneously promoting methane production, belonging to the field of algal resource utilization and disposal. The specific method includes: uniformly mixing synthesized magnetic nanoparticles with algal liquid; harvesting and concentrating microalgae using magnetic separation; mixing the magnetic-algae aggregates with waste activated sludge in a certain proportion and then anaerobically treating the sludge; and finally recovering the magnetic nanoparticles from the anaerobic co-digestion residue using air flotation. Results show that compared with existing technologies, this invention achieves over 95% high-efficiency integrated treatment of microalgae harvesting and anaerobic co-digestion, without requiring the addition of magnetic nanoparticles during the anaerobic co-digestion process; it simplifies the process flow, achieves harmless treatment of microalgae and waste activated sludge, and further promotes methane production in the subsequent anaerobic co-digestion process; it also enables the recovery and reuse of magnetic nanoparticles, has simple operating equipment, and produces virtually no secondary pollution.

The present invention relates to a method of reducing methane production in animals of the order artiodactyla, the method comprising administering to the animals one or more compounds or a feed additive comprising the one or more compounds, wherein the one or more compounds are selected from the following general formula (I) or a salt thereof: The present invention also relates to a feed additive comprising the one or more compounds as defined in the present invention and at least one selected from the group consisting of probiotica, bacteria, enzymes (lactate), fatty acids, herbs, spices or essential oils, vitamins, minerals, trace elements, flavour enhancers and preservatives.

This invention relates to the field of agricultural biotechnology, specifically to a rumen methane inhibitory composition for ruminants containing *Asparagus yew* and *Pterostilbene*. The active components of the composition include *Asparagus yew* and its preparations, and *Pterostilbene*, which are used in a predetermined ratio to reduce rumen methane production and alleviate hydrogen accumulation in ruminants.

This invention relates to the field of photocatalytic materials technology, disclosing an atomic-level catalytic material, its preparation method, and its application. The method includes mixing nickel chloride with deionized water to form a solution, adding thiourea and mixing thoroughly to obtain a mixture; ultrasonically treating the mixture and continuously stirring until completely dissolved; drying the dissolved solution in an oven to obtain a solid powder; placing the solid powder in a muffle furnace and calcining it in air, then cooling to obtain the atomic-level catalytic material. This atomic-level catalytic material exhibits a nanoflower-like structure, containing nickel elements distributed in single-atom form, without metal clusters. This invention is applied to the photocatalytic carbon dioxide reduction reaction. The introduction of nickel single atoms promotes the separation and migration of photogenerated charge carriers within the material, causing the carbon dioxide reduction reaction pathway to favor methane production, thus improving the selectivity of the target product in the catalytic reaction.

The present invention relates to the field of reducing methane emissions from ruminants. In particular, the present invention relates to administering to a ruminant diiodomethane in an amount of at least 0.5 g diiodomethane per animal per day for reducing methane production resulting from digestive activities of said ruminant.

The invention provides a delayed release dosage form and a bolus configured for administration to an animal, wherein said dosage form and said bolus is configured to release a hydrophobic substance to the animal over a period of time. Preferably the hydrophobic substance is a haloform. Also provided is the use of the delayed release dosage form or bolus of the invention to reduce methane production in a ruminant animal. Also provided is the method of manufacturing a bolus of the invention.

The application provides a sludge anaerobic fermentation methane production in-situ biogas upgrading method and device based on free ammonia pretreatment, and the method comprises the following steps: adding a free ammonia conditioning solution to sludge to be pretreated in a pretreatment unit, so that the free ammonia concentration reaches 500-1500 mg / L, and the sludge is treated for 12-36 hours to obtain a fermentation substrate with a pH value of about 6.5-8.3; and the fermentation substrate pretreated by free ammonia is input into an anaerobic biological reactor for fermentation to produce biological natural gas mainly composed of methane. The application is implemented based on free ammonia to destroy the intracellular and extracellular proton and potassium ion concentration balance of the fermentation substrate, accelerate the dissolution of intracellular organic matter of the sludge in the pretreatment and hydrolysis stage, increase the release amount of soluble organic matter and the release amount of total organic matter, and further utilize the hydrogenotrophic methanogenesis pathway principle specifically regulated by free ammonia to synergistically improve the methane concentration and yield of the biogas.

The invention relates to a method for producing hydrogen alkane through two-stage anaerobic fermentation of lincomycin fungus residues, and belongs to the technical field of biochemistry. The invention aims to improve the bioenergy conversion efficiency of the antibiotic mushroom dregs, reduce the harm caused by residues of produced antibiotics and reduce the cost of innocent treatment of the antibiotic mushroom dregs. The invention provides a method for producing hydrogen and methane in two stages by utilizing lincomycin fungus residues. The method comprises the following steps: carrying out hydrothermal pretreatment on the lincomycin fungus residues, and taking supernate; selecting an activated fermentation liquid as an inoculum, inoculating the inoculum into the supernatant, and carrying out first-stage anaerobic fermentation to obtain hydrogen; biogas slurry of an anaerobic fermentation methane production system or sludge of an anaerobic fermentation link in the antibiotic wastewater sewage treatment process is selected as seed sludge to be inoculated into residues at the hydrogen production fermentation tail end, and second-stage anaerobic fermentation is performed to obtain methane. Development of a novel efficient pretreatment technology and a fermentation mode becomes a critical path for breaking through the bottleneck of the current technology, and a high-quality substrate is provided for subsequent anaerobic fermentation.

The invention discloses a method for improving the efficiency of producing methane by solid anaerobic fermentation of agricultural and forestry residues through wood fiber pretreatment, and belongs to the technical field of biomass energy utilization. The method comprises the following steps: carrying out one or more coupling modes of physical pretreatment, chemical pretreatment and biological pretreatment on crushed and screened agricultural and forestry residues; the pretreated agriculture and forestry residues are used as a fermentation substrate, the water content and the element proportion are adjusted, anaerobic digestion sludge is inoculated, solid anaerobic fermentation is conducted for 25-35 days at the temperature of 30-55 DEG C, and biogas is collected. According to the invention, the wood fiber structure and components are optimized through physical-chemical-biological single or coupled pretreatment, and the solid anaerobic fermentation biogas yield and methane purity can be effectively improved in combination with accurate regulation and control of the ratio of carbon, nitrogen, phosphorus and sulfur and adaptive fermentation conditions; the energy consumption, the reagent consumption and the pollution abatement cost in the biomass energy preparation process are obviously reduced.

The present application belongs to the field of solid resource treatment, and relates to a method for preparing high-efficiency microbial enhancer by using digested sludge and recycling the high-efficiency microbial enhancer in situ to strengthen the anaerobic treatment of methane production of residual sludge. The specific method comprises the following steps: (1) preparing high-efficiency microbial enhancer by using digested sludge as raw material; (2) constructing a semi-continuous reaction device for sludge anaerobic digestion; (3) adding the high-efficiency microbial enhancer to the residual sludge for pretreatment; and (4) adding anaerobic inoculated sludge, setting different sludge retention times for anaerobic digestion, and obtaining high-value-added methane. The present application prepares high-efficiency microbial enhancer by using digested sludge as raw material, which not only provides a new outlet for the large amount of digested sludge, but also enhances the recycling of resource energy in the residual sludge through recycling, so as to treat waste with waste. Compared with the traditional pretreatment method of sludge anaerobic digestion, a large amount of energy and reagents are saved.

The present invention relates to processes for preparing compositions comprising manufactured bromoform and a bromoform stabilising excipient suitable for reducing total gas production and / or methane production and / or improving growth performance in a ruminant animal.

The invention relates to the technical field of clean energy production, in particular to application of ZIF-67 in relieving inhibition of metformin on anaerobic digestion. According to the present invention, the MEF-containing organic wastewater is adopted as the object, the ZIF-67 enhanced AD system is constructed, the MEF toxicity relieving mechanism of the ZIF-67 is comprehensively evaluated from the multiple dimensions of methane yield-metabolic function-microbial community, and the new thought and the technical support are provided for the green restoration of PPCPs inhibition AD.

The present disclosure relates generally to processes for the production of methane from hydrogen and carbon dioxide. In particular, the disclosure provides for a process for providing a product composition comprising methane. The process includes contacting a gaseous mixture comprising hydrogen and carbon dioxide with a supported methane synthesis catalyst, the supported methane synthesis catalyst comprising cobalt in the range of 1 wt % to 35 wt % on an elemental basis, to provide the product composition with a methane selectivity of at least 75%.

The invention relates to the technical field of agriculture, in particular to a method for fusing anaerobic fermentation compost, which comprises the following steps: mixing organic waste raw materials, and adding sodium citrate and magnesium sulfate for treatment; feeding the treated raw materials into an anaerobic reactor, adding an iron-based core-shell structure material, controlling the pH value of the system, and carrying out anaerobic fermentation to obtain digestion residues; bicarbonate and sodium citrate are added into the digestion residues to be mixed; and entering an aerobic composting stage, controlling the moisture content of the pile body under an oxygen supply condition, heating the pile body, maintaining the pile body to enter a decomposition stage, and carrying out natural aging to produce a decomposed organic fertilizer. In the invention, by virtue of the porous structure and surface characteristics of the iron-based core-shell structure material, not only is the stability of the fermentation process ensured, but also the microbial electron transfer process is optimized, and the methane production efficiency is improved; the compound microbial agent effectively increases the number of effective microbial communities, improves the temperature and ventilation conditions in the composting process, and ensures uniform decomposition of the organic wastes.

This invention enables accurate measurement of greenhouse gas emissions from animals. It also allows for easy evaluation of the reduction effect of greenhouse gas emissions from animals. Furthermore, it provides a methane emission inhibitor that suppresses methane production from Methanobrevibacter bacteria. [Solution] A bacterial quantification method for quantifying Methanobrevibacter species contained in the rectal feces of animals includes the steps of: collecting rectal feces from an animal; holding the rectal fecal sample in an anaerobic porter under anaerobic conditions; replacing the gas in the anaerobic porter with nitrogen gas, diluting the sample with a culture medium, and culturing the bacteria in a test tube; recovering the cultured bacteria; extracting DNA from the recovered bacteria; and quantifying the Methanobrevibacter species from the extracted DNA by quantitative PCR or a gene analysis method using next-generation sequencing analysis.

The present application belongs to the technical field of feed, and is a fermented feed for ruminants and a preparation method thereof. The fermented feed for ruminants is obtained by fermenting soybean straw and rice straw after being mixed with a fermentation agent. The fermentation agent comprises Lactobacillus plantarum, Pediococcus pentosaceus, Bacillus subtilis and Lactobacillus brevis. It is found that the mixture of the four bacteria has a certain synergistic effect on the fermentation of soybean straw, which can effectively improve the nutritional value of the feed. When the mixture of the four bacteria is used for the fermentation of the mixture of soybean straw and rice straw, the synergistic effect is more obvious, which not only solves the problem of the ensiling utilization of soybean straw, but also improves the nutritional value of the feed, effectively reduces the methane production in rumen fermentation, and can bring the effect of methane emission reduction to the ruminant breeding industry.

The invention relates to the technical field of potato starch wastewater and waste residue treatment, in particular to a process for preparing biogas through resource utilization of potato starch wastewater and waste residues. Comprising the following steps: collecting potato starch waste residues and wastewater, crushing the potato starch waste residues, mixing the crushed potato starch waste residues with the wastewater, adjusting the solid content to 8-12% to obtain a mixed liquid, carrying out heat treatment on the mixed liquid, cooling, adding a compound enzyme preparation, and adding a nitrogen material to adjust the carbon-nitrogen ratio to obtain a pretreated raw material; adding the pretreated raw materials into an acidogenic phase reactor for hydrolysis and acidification, then pumping the pretreated raw materials into a methanogenic phase reactor to produce methane, and collecting and purifying biogas generated at the top of the methanogenic reactor by a gas collecting cover and storing the biogas in a gas storage cabinet. The biogas prepared by the biogas preparation process is high in yield, the content of methane in unpurified biogas is high, and subsequent purification is convenient.

The application relates to a shale or coal rock gas evaluation method based on a gas-water two-phase flow isotope fractionation model, which comprises the following steps: 1, collecting data; 2, establishing a gas well model; 3, establishing a control equation set; 4, coupling the influence of real gas effect and effective stress; 5, establishing a gas transmission model and a relative permeability model; 6, establishing a capillary pressure and saturation relationship; 7, considering critical desorption pressure; 8, setting initial conditions and boundary conditions; 9, solving the control equation set; 10, calculating production dynamic parameters and isotope values; 11, performing history matching; 12, verifying the quality of history matching; 13, predicting productivity; 14, calculating gas dynamic output proportion; 15, identifying fractionation inflection points and gas production mechanism conversion; the application realizes the quantitative evaluation of deep reservoir production prediction and output gas dynamic proportion by coupling gas-water two-phase flow, multiple gas transmission mechanisms, stress sensitivity and methane isotope competitive adsorption theory.

The hydrogen biological methane production system comprises a trickle reactor, a cavity of the trickle reactor is sequentially divided into a feeding area, a filler area, a gas outlet area and a liquid storage area from top to bottom, and stored liquid is contained in the liquid storage area; gas discharged from an outlet of the carbon dioxide supply device comprises carbon dioxide, and an outlet of the hydrogen supply device is communicated with the feeding area through a first pipeline; an outlet of the carbon dioxide supply device is communicated with the feeding area through a second pipeline; the nutrient solution supplementing device can be used for introducing a nutrient solution into the feeding area; the packing part is arranged in the packing area, and the packing part comprises packing accumulated in the packing area; an inlet of the exhaust pipe is connected with the trickling reactor and is communicated with the air outlet area, and the filler return pipeline can be used for introducing filler at the bottom of the filler area into the feeding area. Therefore, the hydrogen biomethanogenesis system according to the present invention can facilitate the production of methane.

The invention belongs to the technical field of sludge anaerobic digestion, and particularly relates to a microbial primary battery coupling system based on anaerobic digestion and a treatment method. On the basis of an anaerobic digestion and microbial primary battery coupling system, the negative influence of volatile fatty acid accumulation in an anaerobic digestion system is relieved by utilizing the catalytic action of microorganisms, the extracellular electron transfer capacity of methanogens is improved, the system stability is improved, and methane production is promoted. According to the method, the anaerobic digestion performance of the system is improved, biological electric energy can be recycled, sludge generation is reduced, and the method has the advantages of being convenient to operate and maintain, low in cost and the like and has great advantages compared with a traditional anaerobic digestion system.