3773results about "Gaseous fuels" patented technology

The invention relates to a facility for producing liquid CO2 and biomethane, comprising: —a unit for producing biogas; —at least one unit for the membrane separation of biogas to produce biomethane and a gaseous mixture M1 mainly comprising carbon dioxide; —a unit for cryogenically distilling the gaseous mixture M1 to produce liquid CO2 and a gaseous mixture M2 comprising carbon dioxide, methane, oxygen and hydrogen; —one or more membranes located in the flow of the gaseous mixture M2 to separate the methane from the oxygen-hydrogen mixture

A method for thermal treatment and chemical transformation of waste comprising carbonaceous materials for generation of a fuel gas or methanol, and for processing solid particles using a cyclonic particle separator, comprising adjusting the humidity of the materials, introduction into thermolysis reactor(s), introduction into a conversion unit, causing gasification of solid carbonaceous material, introducing the solid rest into char handling unit for further treatment in a cyclonic particle separator.

A method for separating a raw feed gas stream utilizes a compressor, a chiller, a membrane drying stage, and a plurality of membrane separation stages. The raw feed gas stream may comprise biogas. In one example, the raw feed gas stream is supplied to the chiller where it is cooled to a target operating temperature to separate out condensed water. The gas stream is then supplied to a membrane drying stage to separate out water vapor. An off-gas from one of the membrane module stages may be recycled as a low pressure sweep gas on the low pressure side of the membrane drying stage to increase the driving force for water permeation within the membrane drying stage. The gas stream is then supplied to the plurality of membrane separation stages where it is upgraded into a high purity methane stream.

Disclosed herein are methods and systems for producing a liquefied methane product from a methane- and carbon dioxide-containing feed stream, in which a plurality of membrane stages comprising gas separation membranes that are more permeable to carbon dioxide than methane are used to remove carbon dioxide from the feed and form a retentate stream that is enriched in methane, said retentate stream being then cooled and liquefied to provide the liquefied methane product. In particular, the disclosed methods and systems may be used for producing liquefied biomethane from a biogas feed.

An improved method and apparatus for removing acid gases and other impurities from raw biogas streams, such as biogas from landfills or biogas from controlled anaerobic digestion, is disclosed. The method provides efficient generation of high-purity renewable natural gas from raw biogas. The biogas is treated in a multi-stage membrane system integrated with compression equipment. The membrane separation units are arranged into interconnected high-pressure and low-pressure gas recycling loops powered by high-pressure and low-pressure compressors. The multi-stage membrane system can be integrated with deoxygenation and auxiliary nitrogen removal systems. The combined system provides for the generation of efficient contaminant removal from raw biogas to generate high-purity methane products with reduced compression energy consumption.

The invention relates to the technical field of underground gas production, and discloses a metal sealing gas production wellhead device which comprises a body. A housing; the filtering assembly is used for circularly filtering gas in the wellhead; the self-discharging assembly is used for automatically discharging impurity particles attached to the filtering assembly; the filtering assembly comprises a screening device and an indexing rotating device; and the screening device is used for filtering gas impurities in the well. According to the metal sealing gas production wellhead device, drum-type double-layer filtering can be achieved through the arranged filtering assembly, so that it can be guaranteed that impurity particles in mined gas can be greatly filtered out, and the purity of the extracted gas is guaranteed. And the indexing rotation of the circular filter cartridge can be controlled by utilizing the indexing rotation device, so that the gradually blocked circular filter cartridge can be rotated, and clean filter holes face the underground again, and therefore, circulating automatic anti-blocking screening is carried out, and the operation stability of the gas production wellhead device is ensured.

The biogas in-situ purification device comprises an acid production reactor and a methane production reactor, a discharge port is formed in the bottom of the acid production reactor, the methane production reactor is provided with a feed port connected with the discharge port, a first gas outlet is formed in the top of the methane production reactor, and a second gas outlet is formed in the bottom of the methane production reactor. A gas inlet for directly introducing hydrogen or synthesis gas is formed in the bottom of the methanogenesis reactor, and a conductive material inlet is formed in the acid production reactor and / or the methanogenesis reactor. The conductive material inlet is formed in the acidogenic reactor and / or the methanogenic reactor, and the conductive material is introduced into the system, so that on one hand, the conductive material can promote an interspecific direct electron transfer mode among microorganisms, the tolerance of the acidogenic microorganisms to hydrogen is enhanced, and the overall operation stability of the system is enhanced; and on the other hand, the conductive material can promote the formation of granular sludge in the methane production reactor and enhance the symbiotic metabolism and action among microorganisms, so that the conversion rate of carbon dioxide and the purity of methane in the final biogas are improved.

The invention discloses a solid oxide electrolysis reactor and system for producing hydrogen by coupling electrolytic water with combustible gas, the solid oxide electrolysis reactor comprises an anode end plate, an intermediate plate assembly and a cathode end plate which are connected in sequence, the intermediate plate assembly comprises a plurality of repetitive units, and the repetitive units are connected through connecting plates; the repeating unit comprises an electrolytic tank, the electrolytic tank comprises an anode, an electrolyte and a cathode, water vapor or a water vapor and hydrogen mixed gas is introduced into the cathode to generate an electrolyzed water reduction reaction to obtain hydrogen, and a combustible gas, water vapor and / or carbon dioxide mixed gas is introduced into the anode to generate hydrogen; and the combustible gas and oxygen ions which are generated by electrolyzing water at the cathode and are transmitted to the anode are subjected to deep oxidation reaction to obtain carbon dioxide. The cathode product gas is high-purity hydrogen or high-purity hydrogen obtained after condensation, the anode product gas is mixed gas of water vapor and carbon dioxide or mixed gas mainly comprising water vapor and carbon dioxide, and self-enriched high-concentration carbon dioxide can be obtained after condensation.

A method for providing a fuel includes providing biogas from a plurality of biogas sources, the biogas from each biogas source produced in a process comprising filling a vessel with raw biogas or partially purified biogas to a pressure of at least 1500 psig and transporting the filled vessel to a centralized processing facility by vehicle. A fuel is produced in a fuel production process that includes feeding the biogas transported to the centralized processing facility to a biogas upgrading system that is configured to provide a carbon dioxide removed from the biogas. The removed carbon dioxide is provided for transport by vehicle and / or pipeline and / or sequestered to offset greenhouse gas emissions attributed to compressing the biogas for transport.

An improved process for removing acid gases from raw biogas streams, such as biogas from landfills or biogas from controlled anaerobic digestion, provides for efficient H2S removal combined with carbon dioxide removal. The biogas is treated in a biological hydrogen sulfide removal system integrated with a multi-stage membrane gas separation system. The combined system provides for efficient acid gas removal while simultaneously limiting oxygen carryover into the treated product stream by beneficially utilizing oxygen in the biological desulfurization system.

The invention provides a composition, an adsorption and storage device containing the composition and an associated gas recovery system. The composition comprises a hierarchical porous MOFs-based composite phase change material and an adsorption material, and the adsorption storage device is an adsorption storage tank with the composition as bed filling. The associated gas recovery system mainly comprises a pressurizing unit, a cooling, condensing and dehumidifying unit and an adsorption and storage unit, wherein the adsorption and storage unit is the adsorption and storage device. The associated gas recovery system can realize a medium pressure-low temperature-phase change temperature control-adsorption storage single pull well associated gas recovery process, and realizes efficient recovery of single pull well associated gas with small gas volume, low casing pressure and far distance from a gathering and transportation station at low cost at low pressure (specifically 2-4MPa).

Disclosed herein are membrane-based gas separation methods and systems. The methods and systems may, in particular, be used for separating a feed stream comprising methane and carbon dioxide (such as for example a biogas feed stream) in order to provide a methane product stream (such as for example a biomethane stream).

An improved method and apparatus for removing acid gases and other impurities from raw biogas streams, such as biogas from landfills or biogas from controlled anaerobic digestion, is disclosed. The method provides efficient generation of high-purity renewable natural gas from raw biogas. The biogas is treated in a multi-stage membrane system integrated with compression equipment. The membrane separation stages are integrated with high-pressure and low-pressure compressors with the low-pressure compressor operating in a defined pressure range. The combined system provides for efficient contaminant removal from raw biogas to generate high-purity methane products with reduced membrane area and compression energy consumption.

A method for removing acidic gases from a post combustion process stream, the method comprising the steps of: receiving the post combustion process stream into hollow fibers of at least one MBC cell, each hollow fiber gas permeable, liquid impermeable; passing a lean solvent in contact with an external surface of said hollow fibers; exchanging said acidic gas into the solvent through the hollow fiber; venting an acidic gas lean stream; exiting an acidic gas rich solvent.

Example gas recovery systems include a source gas conditioning assembly configured to condition and compress the inlet source gas to provide a conditioned source gas, a first membrane assembly configured to separate the conditioned source gas into a hydrocarbon enriched stream and a recovery stream, a second membrane assembly fluidly coupled to the hydrocarbon enriched stream, and configured to separate the hydrocarbon enriched stream into a hydrocarbon product stream and a recycle stream, a carbon dioxide (CO2) plant assembly fluidly coupled to the recovery stream configured to provide a carbon dioxide product stream and an enriched recycle stream, a standalone membrane assembly configured to separate the enriched recycle stream into a hydrocarbon enriched recycle stream and an effluent stream, and wherein the source gas conditioning assembly is fluidly coupled to the recycle stream and the hydrocarbon enriched recycle stream.

The invention discloses a biogas fermentation purification liquefaction and carbon capture process. The process comprises a biogas fermentation system for performing high-temperature fermentation on biomass; the biogas purification and liquefaction system, the CO2 purification and liquefaction system and the organic fertilizer production system are arranged at the biogas residue output end of the biogas fermentation system to produce organic fertilizer; a thermal energy recovery system; according to the invention, a high-temperature facultative anaerobic hydrolysis and high-temperature anaerobic fermentation process is provided, so that high-concentration biomass biogas is produced; cH4, H2S and CO2 in the biogas are separated and liquefied by adopting a process of'wet process and dry process serial desulfurization, PSA (Pressure Swing Adsorption) + MDEA (Methyl Methanol Ether Alcohol) decarburization, molecular sieve dehydration, single-order two-stage mixed refrigerant compression and propane refrigeration compression ', and produced liquid CH4 and CO2 are recycled; meanwhile, the biogas residues are subjected to a secondary fermentation technology under the action of microorganisms to obtain a solid organic fertilizer; in addition, the solar heat collection and heat pump technology is utilized, and the whole-field heat energy is recycled to supply heat to the biogas fermentation system.

An improved process for removing acid gases from raw biogas streams, such as biogas from landfills or biogas from controlled anaerobic digestion, provides for efficient H2S removal combined with carbon dioxide removal. The biogas is treated in a biological hydrogen sulfide removal system integrated with a membrane gas separation system. The combined system provides for efficient acid gas removal while simultaneously limiting oxygen carryover into the treated product stream by beneficially utilizing oxygen in the biological desulfurization system.

The invention discloses a system and a method for classified sewage treatment, and belongs to the technical field of environmental engineering and water treatment. The system comprises the following components: an intelligent water quality detection module, which is used for real-time and accurate monitoring of COD, BOD, ammonia nitrogen, total phosphorus, suspended matter concentration and heavy metal content; the sectional bioreactor realizes deep removal of nitrogen and phosphorus and efficient biological treatment by flexibly adjusting reaction conditions of each section; the intelligent flocculation control module is used for automatically and accurately adjusting the adding amount of a flocculating agent, and is combined with integrated operation of efficient inclined tube precipitation and sludge concentration, so that the water quality of discharged water is stable, and the medicament consumption is reduced; the ultrafiltration membrane bioreactor effectively removes residual suspended matters and colloids, and ensures that the effluent stably reaches the standard for a long time through the synergistic effect of catalytic ozonation; and the sludge treatment module is used for realizing collaborative optimization management of sludge reduction, recycling and energy recycling.

The invention discloses a novel mercaptan removal catalyst as well as a preparation method and application thereof, the catalyst takes potassium-containing solution modified activated carbon as a carrier and one or a combination of more of CH3COOCs, CH3COOK, Cs2CO3 and Rb2CO3 as an active component, and the mass ratio of the active component substance to the modified activated carbon is 3-5%. The preparation method comprises the following steps: (1) modifying activated carbon by using a potassium-containing solution with the concentration of 15-20%, soaking the activated carbon for 2-4 hours by using the potassium-containing solution, then cleaning the activated carbon by using deionized water until the pH value is weakly alkaline, and drying the activated carbon for later use; (2) carrying out vacuum drying on the modified activated carbon at a certain temperature, and dipping a certain amount of active component-containing solution at 20-60 DEG C for 4-12 hours; and (3) carrying out vacuum drying on the active carbon impregnated with the active component, and roasting under the protection of N2 to obtain the mercaptan removal catalyst. The preparation method is simple, the prepared mercaptan removal catalyst has the characteristics of large specific surface and pore volume and the like, and compared with existing patents, the mercaptan removal catalyst is more favorable for maintaining the active center of the catalyst, maintaining the activity stability of the catalyst and improving the mercaptan removal rate.

Example gas recovery systems disclosed herein include a source gas conditioning assembly comprising a compression component and swing adsorption component configured to provide a conditioned source gas, a first membrane assembly to separate the conditioned source gas into a hydrocarbon enriched stream and a recovery stream, a second membrane assembly to separate the hydrocarbon enriched stream into a hydrocarbon product stream and a recycle stream, a carbon dioxide plant assembly to provide a carbon dioxide product stream and an enriched recycle stream, and a standalone membrane assembly at least selectively fluidly coupled to the enriched recycle stream, and separates the enriched recycle stream into a hydrocarbon enriched recycle stream and an effluent stream. The swing adsorption component is at least selectively coupled to the enriched recycle stream. The source gas conditioning assembly is fluidly coupled to the recycle stream, and at least selectively coupled to the hydrocarbon enriched recycle stream.

The invention provides a coal mine ventilation air methane synergistic enrichment and fluidized heat storage combustion system and method. The system comprises an air shaft diffusion tower and a ventilation air methane collecting device, the method comprises the following steps: collection and compression of ventilation air methane, cooling and boosting adsorption of an adsorption tower, pressure drop equalization of the adsorption tower, temperature rise, pressure reduction and desorption of the adsorption tower, pressure rise equalization of the adsorption tower, periodic cycle work of the adsorption tower, preheating of a packed bed of a heat storage furnace, fluidized heat storage oxidation of coal gangue and gas, and waste heat recovery and utilization. According to the invention, safe and efficient enrichment of ventilation air methane can be realized, and fluidized heat storage oxidation coupling utilization of concentrated gas and coal gangue particles can be realized; the oxidation waste heat is used as a generator heat source; the carbon reduction scheme of large-scale separation and concentration-synergistic oxidation-efficient utilization of the oversize coal mine ventilation air methane is formed, the coal industry is assisted to achieve the goal of'two wastes' and sustainable development, and large-flow, low-cost, safe and efficient treatment and utilization of the ventilation air methane discharged by an oversize low-gas mine can be achieved.

The invention provides a method for rapidly preparing an SSZ-13 molecular sieve membrane based on a double-template system, and belongs to the field of preparation and application of molecular sieve membrane materials. The polymer ammonium is introduced into the sol and seed crystal suspension, so that the nucleation and crystallization process in the synthesis system is obviously accelerated, the traditional synthesis time can be shortened by 50% or above, and the rapid growth of the SSZ-13 seed crystal on the surface of the porous carrier is realized. Based on the synergistic effect of the double template agents, the preparation repeatability of the SSZ-13 molecular sieve membrane is effectively improved, and large-scale application of high-quality membrane products is facilitated. The SSZ-13 molecular sieve membrane shows excellent separation performance in CO2 / CH4 mixed gas, and has remarkable industrial application value in the field of natural gas decarburization.

The invention belongs to the technical field of natural gas transportation and distribution filtration of natural gas stations, and relates to a filter and a filter element backwashing method thereof without stopping natural gas transportation and distribution filtration. The filter comprises a main cylinder, a main filter element and a backwashing device, wherein the backwashing device comprises an air blowing cylinder arranged in the main filter element, a high-pressure hose used for conveying high-pressure gas into the air blowing cylinder and a driving mechanism used for driving the air blowing cylinder to reciprocate in the main filter element in the axial direction; the air blowing cylinder is of a cylindrical structure with two closed ends, and a plurality of air blowing holes are formed in the side wall; the high-pressure hose is located in the main filter element, the bottom end of the high-pressure hose is connected to the top end of the air blowing cylinder, the top end of the high-pressure hose is externally connected with a high-pressure air supply source, and high-pressure air entering the air blowing cylinder is blown out through the air blowing holes to backwash the main filter element from inside to outside. The air blowing cylinder of the filter can perform movable backwashing in the main filter element, so that the whole main filter element is helped to recover the filtering effect, and the backwashing device can independently operate to backwash the main filter element while the filter continuously filters natural gas.

Gas recovery systems include a source gas conditioning assembly including a compression component and a swing adsorption component and configured to provide a conditioned source gas, a first membrane assembly configured to separate the conditioned source gas into a hydrocarbon enriched stream and a recovery stream, a second membrane assembly configured to separate the hydrocarbon enriched stream into a hydrocarbon product stream and a recycle stream, a carbon dioxide (CO2) swing adsorption component configured to provide, from a recovery stream, a CO2 enriched stream and a flush gas stream, a CO2 plant assembly configured to provide, from the CO2 enriched stream, a carbon dioxide product stream and an enriched recycle stream, and a standalone membrane assembly configured to separate the enriched recycle stream into a hydrocarbon enriched recycle stream and an effluent stream.

The invention relates to a preparation method of a normal-temperature normal-pressure efficient gas adsorption composite material. The method comprises the following steps: firstly, pretreating activated carbon to obtain surface-OH modified mesoporous activated carbon; then modifying the surface-OH modified mesoporous activated carbon with the ZIF-8 material to obtain ZIF-8 (at) OH-AC; and finally, performing surface hydrophobization modification to obtain the adsorption material. Wherein in the modification process, ZIF-8 is firmly loaded and uniformly distributed on the surface of hydroxyl-modified mesoporous activated carbon by adopting an in-situ growth technology, the interface bonding force is enhanced, the loading capacity of the activated carbon on the MOFs material is improved, and by utilizing the chemical adsorption effect of ZIF-8 Zn < 2 + > and methane and the high porosity of the mesoporous activated carbon, the MOFs material can be prepared. The adsorption capacity of the composite material to methane is greatly improved, meanwhile, the moisture resistance of the composite material is effectively improved, the composite material can still keep stable and efficient adsorption performance in a high-humidity environment, and the problem that an existing material is prone to inactivation in a humid environment is solved.

A device for separating a gas stream which has a compressor and three membrane separation units in series, connected to pass the retentate stream of each of the first two units to the subsequent membrane separation unit, comprises conduits for recycling the permeate streams of the second and the third membrane separation unit to upstream of the compressor and a control device controlling the fraction of the second permeate stream which is recycled. Adjusting which fraction of the second permeate is recycled can be used to maintain a target composition of the retentate obtained in the third membrane separation unit when the flow rate or the composition of the gas stream changes.

The invention discloses a remote well gas field desulfurization device and method. The desulfurization device comprises a primary purification box, and a first purification assembly is arranged in the primary purification box; the first purification assembly comprises a conical filter element, a rotating disc is arranged below the conical filter element, a buffer disc is arranged in the center of the rotating disc, the lower end face of the buffer disc protrudes out of the lower end face of the rotating disc, and a plurality of air spraying pipes are arranged on the circumferential side wall of the buffer disc; a scraping unit is arranged above the filter element; the scraping unit comprises a fixed barrel, and a piston block and a reset spring located at the bottom of the piston block and the bottom of the fixed barrel are arranged in the fixed barrel; the upper end of the push rod is fixedly connected with the piston block, and the scraping strip is fixed at the bottom end of the push rod and is parallel to the inclined surface of the filter element. The conical filter element structure is used for scraping and cleaning deposited solid impurities, so that the long-term filtering effect of the filter element is ensured, and the running life of the desulfurization device is prolonged.

The invention belongs to the technical field of natural gas purification, and particularly relates to a phase change absorbent for desulfurization and decarburization of natural gas and a preparation method thereof.The phase change absorbent is prepared from, by mass, 15%-60% of ionic liquid, 40%-85% of organic solvent and the balance water; wherein a cation donor of the ionic liquid is cyclic amine, and an anion donor of the ionic liquid is nitrogenous organic acid or nitrogenous organic acid salt; the cyclic amine-organic acid ionic liquid is used as an active component of the phase change absorbent, and the active component of the absorbent contains cyclic amido, so that the hydrolysis reaction of COS can be efficiently catalyzed, the COS is converted into H2S which is easily absorbed by the absorbent, and the efficient removal of the COS is realized; secondly, according to the content of the sulfide and the carbon dioxide in the natural gas, different kinds of organic acids are selected as anion donors of the ionic liquid, so that the alkalinity of the phase change absorbent is regulated and controlled, and the aim of efficiently removing the sulfide and the carbon dioxide in the natural gas is achieved.

The utility model discloses a closed furnace system for converting household garbage incineration into new energy fuel gas, which comprises an incinerator, a scrubber tower, a cooling filter, an oil smoke and water vapor separation tower, a tar filter and a combustible gas decomposition purifier, the incinerator comprises a furnace body, and an incineration chamber for garbage incineration and a secondary combustion chamber for flue gas heating are arranged in the furnace body. Flue gas is led out from the secondary combustion chamber through a high-pressure induced draft fan and sequentially enters a scrubber tower, a cooling filter and an oil smoke and water vapor separation tower, a calcium carbonate solution is sprayed in the scrubber tower to conduct desulfurization and dust removal on the flue gas, the cooling filter conducts cooling and filtering on the flue gas, and the oil smoke and water vapor separation tower decomposes moisture and tar in the flue gas. The flue gas is sequentially connected into a tar filter and a combustible gas decomposition purifier through a Roots machine, an oil gas filter is arranged in the tar filter to filter tar in the flue gas, and a purification layer is arranged in the combustible gas decomposition purifier to remove foreign gas in the flue gas and purify the flue gas into new energy fuel gas. The method has the characteristic of efficient and environment-friendly garbage treatment.

The invention discloses a method for preparing aviation kerosene (aromatic hydrocarbon components) from biogas. The method comprises the following steps: separating biogas to obtain methane and carbon dioxide, and then carrying out a two-step chemical reaction process. The method comprises the following steps: firstly, carrying out dehydrogenation aromatization on methane to obtain aromatic hydrocarbon mainly containing benzene and hydrogen, and separating methane for circulating dehydrogenation aromatization reaction; then hydrogen and aromatic hydrocarbon are merged into carbon dioxide, and the polysubstituted aromatic hydrocarbon is obtained by coupling methanol synthesis and alkylation reaction of benzene without external source hydrogen. The method provided by the invention avoids the problem of low selectivity of aviation kerosene fraction hydrocarbons in a route of Fischer-Tropsch synthesis after methane and carbon dioxide are converted into synthesis gas. According to the conversion method for highly coupling the reaction processes, a new route for producing sustainable aviation kerosene from biogas is developed.