125 results about "Biogenic gas" patented technology

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.

The present disclosure relates to a carbon dioxide capture apparatus and process combined with biogas upgrading, and there is provided the carbon dioxide capture apparatus combined with biogas upgrading for simultaneously obtaining high purity methane and carbon dioxide, and improving separation efficiency without an additional process by making use of gas streams after a liquefaction process, and recovering cold heat in the process.

The invention belongs to the field of coupling power generation, and provides a coupling pulverized coal fired boiler low-load stable combustion and blending combustion system and a control method. According to the system, cold air from a boiler primary air fan is divided into two paths, one path is directly conveyed to a cold air main pipe, and the other path is conveyed to a hot air main pipe after being preheated by a preheater; the coal mill correspondingly takes cold air and hot air from the cold air mother pipe and the hot air mother pipe, the cold air and the hot air are mixed to a set temperature and then enter the coal mill for pulverized coal drying, and the dried pulverized coal is conveyed to the pulverized coal boiler to enter a hearth for combustion; the biomass gasification furnace takes cold air and hot air from the cold air mother pipe and the hot air mother pipe correspondingly, and the cold air and the hot air enter the biomass gasification furnace after being mixed to a set temperature; the biomass material is gasified in the biomass gasification furnace to generate carbonized products, namely biomass charcoal and biogas; the carbonized product biomass charcoal is conveyed to a coal mill to be milled together with the raw coal, and then is blown to a pulverized coal boiler to enter a hearth for combustion; biogas directly enters the pulverized coal boiler and enters a hearth for combustion.

The invention discloses a biogas logging identification method and device, a medium and electronic equipment. The method comprises the steps that coring observation is conducted on the coal measure strata, seismic data and logging data are combined, geological layering is conducted on the coal measure strata, and the geological layering is used for eliminating the influence of the space structure of the coal measure strata on an acoustic logging curve; an acoustic logging curve of the coal measure stratum is obtained, and borehole environment correction is conducted on the interval transit time corresponding to the acoustic logging curve; establishing a cross plot according to the corrected acoustic logging curve and a neutron gamma curve obtained by analyzing measured data; based on the cross plot, a gas reservoir fitting curve is obtained, and the gas reservoir fitting curve is used for recognizing a gas reservoir in the coal measure strata. The accuracy of identifying the gas reservoir in the coal measure stratum can be improved.

The invention discloses a metal-doped modified zeolite molecular sieve adsorbent as well as a preparation method and application thereof. The metal-doped modified zeolite molecular sieve adsorbent comprises a carrier and an active metal component loaded on the carrier, the carrier is a mordenite molecular sieve; the active metal components comprise at least two of Ca, Mg, Ti, Fe, Ni, Co, Cu, Zn, Na and Ag; in the adsorbent, the loading capacity of the active metal component is 0.1%-15%. The adsorbent provided by the invention has good separation performance on CH4 / CO2, CH4 / N2, CO2 / N2 and CH4 / CO2 / N2 mixed gas separation systems, has the advantages of simple synthesis method, strong hydrothermal stability, high selectivity and the like, and can meet the requirements of CH4 purification in unconventional natural gas such as landfill gas, sewage treatment methane gas, agricultural and breeding biogas, coal bed gas, shale gas and shallow biogas, and the like. And the requirements of high-concentration natural gas denitrification, CO2 capture and other scenes can be met.

The application provides a multi-gas control device, a use method and an application, and relates to the technical field of biological gas fermentation. The device comprises a gas supply module, the gas supply module comprises multiple groups of gas sources and connecting pipelines, each gas source is connected to an air inlet pipeline through a respective connecting pipeline, a secondary pressure reducing valve, a T-shaped filter, a mass flow meter, a stop valve, a regulating valve and a check valve are sequentially arranged on the connecting pipeline, the air inlet pipeline is connected to a liquid circulation pipeline, gas is discharged from a spraying mechanism connected to the liquid circulation pipeline, the spraying mechanism is arranged in a fermentation tank, the spraying mechanism is connected to a circulating pump through the liquid circulation pipeline, the circulating pump is connected to the bottom of the fermentation tank through a pipeline, the top of the fermentation tank is connected to a detection pipeline, and a precision filter, a vacuum pump, a drying device, a pre-analyzer and a gas analyzer are sequentially arranged on the detection pipeline. The application realizes efficient absorption and utilization of multiple gases, and simultaneously obtains high yield and high quality single-cell protein.

Disclosed are routes for producing liquid hydrocarbon products containing gasoline and / or diesel boiling range hydrocarbons, and optionally renewable products containing non-petroleum derived carbon. In a typical process, a gaseous feed mixture containing a combination of CO 2 and H 2 and / or CH 4 (or other hydrocarbon sources of H 2 ) is converted by a reforming and / or reverse water gas shift (RWGS) reaction optionally used in combination with Fischer-Tropsch (FT) synthesis and / or cracking. Preferred gaseous feed mixtures are biogas or mixtures of CO 2 and H 2 that are not easily upgraded in conventional processes. The catalysts described herein have high activity to catalyze the reforming (including dry reforming) of CH 4 and other light hydrocarbons (e.g., those produced by FT synthesis and recycled to the process as light fractions) and simultaneously catalyze the RWGS reaction. These attributes provide flexibility with respect to compositions that can be efficiently converted. Optionally, the use of an electrically heated reforming reactor in the first reforming stage or initial reforming stage or RWGS stage can improve the economics of small-scale operation.

A method to produce a halogen-depleted gas is described. The method providing a gas derived from and / or including a source of biogas, mixing said gas with a source of hydrogen to produce a processed gas mixture including an acid, and separating said acid from said processed gas mixture. Sulfur, oxygen, carbon dioxide removal processes are integrated into the method. Production of secondary products, and removal thereof, are included. Pre and post processing may be integrated, and production of products is described.

To collect biogas subjected to highly efficient methane fermentation by using a waste raw material increased in calorie by pre-treatment; and to efficiently and effectively utilize a post-processing residue after collecting the biogas by post-treatment.SOLUTION: A biogas plant is provided with a semi-carbonized pellet forming system comprising: a drying treatment residue recovery device; a hydrothermal reaction treatment device that receives the drying treatment residue from the drying treatment residue recovery device and subjects the drying treatment residue to hydrothermal reaction treatment to form a semi-carbonized powder product in a powder form by semi-carbonization; a semi-carbonized powder product recovery device that recovers the formed semi-carbonized powder product; and a semi-carbonized pellet forming device that forms semi-carbonized pellets from the semi-carbonized powder product.SELECTED DRAWING: Figure 1

The present invention provides an integrated plasma catalytic system for biogas conversion comprising a plasma treated mesoporous or microporous catalyst and a plasma source for converting biogas containing methane and carbon dioxide to liquid oxygenates rich in methanol or acetic acid. Biogas from different solid wastes can be converted into liquid oxygenates including methanol and acetic acid under normal temperature and pressure conditions.

A system and method for determining the carbon footprint of a land area based upon emissions of GHGs and carbon sequestration of ABGs. The system makes use of satellite images, public-source emissions data and AGB data to produce a comprehensive carbon footprint metric for a designated land area.

The invention discloses a method for improving anaerobic gas production stability of kitchen waste by adding carbon and iron materials in a combined mode, and the method comprises the following steps that S1, after the kitchen waste is fully smashed, the kitchen waste is added into an anaerobic reactor to be subjected to anaerobic fermentation methane production treatment; s2, a certain amount of biochar is added into an initial system for producing methane through anaerobic fermentation of the kitchen waste, a mixed solution is formed through mixing and stirring, and the effect of improving the anaerobic fermentation stability is obvious after the reaction; and S3, adding a certain amount of ferroferric oxide into the mixed solution, stirring and carrying out anaerobic digestion reaction so as to improve the enzyme activity of microorganisms and increase the biogas production rate of biogas. The biochar and the ferroferric oxide are added in the initial stage of anaerobic fermentation, so that the inhibition effect of harmful substances on microorganisms can be relieved, growth sites and nutrient elements are provided for the microorganisms, the growth of the microorganisms is accelerated, the activity of the microorganisms is improved, and the generation of methane is promoted; further, the biogas production rate of biogas is improved, and the stability of a reaction system is maintained.

A system and method for recovering high-quality biomethane (RNG) from biogas sources are provided. The system and method improve upon conventional practices and yield a biomethane product which meets strict gas pipeline quality specifications. An online sample is captured of a gas stream in near real-time at a pressure swing adsorption vessel, and the online sample is analyzed to detect the presence of one or more targeted products such as CH4, CO2 or N2. The system and method are an improvement to the overall methane recovery efficiency for biogas processing facilities, specifically with regard to PSA control to prevent over or under saturation of the PSA media.

Provided is a system that recycles high-concentration organic food wastewater and organic sludge generated during the food waste treatment process within the process itself to increase bio-gas production and minimize process waste. The present invention provides a system for maximizing bio-gas production and minimizing process waste discharge by constructing key facilities, such as anaerobic digesters, dryers, and deodorizing boilers, in a two-stage configuration and integrating these facilities into an interconnected process. By implementing this system, dried materials generated in the dryers, as well as digested slurry and condensed wastewater generated during the treatment process, may be recycled and recovered within the process. As a result, energy costs may be reduced by increasing bio-gas production, by minimizing external discharge of process waste, outsourcing treatment costs may be reduced.

A process for producing a jet fuel fraction (41), said process comprising steps of feeding at least one of a biogas stream (1), a carbon dioxide stream (2), or a methane stream (3), and at least a fraction of a tail gas recycle stream (32), to a reformer section (10) to provide a synthesis gas stream (11); feeding said synthesis gas stream (11, 22) to a synthesis section (30) to provide a stabilized condensate stream (31), a liquid wax stream (38), the tail gas recycle stream (32) and a concentrated oxygenate recycle stream (36); refining at said stabilized condensate stream (31) and liquid wax stream (38) in a refinery section (40) to provide a jet fuel fraction stream (41); and recycling said concentrated oxygenate recycle stream (36) to a biogas plant, and a plant for carrying out the process.

A system for separating carbon dioxide from a biogas stream includes a first pipe and a second pipe extending within the first pipe. A first inlet at a first end of the second pipe receives the biogas stream, and a second inlet at a first end of the first pipe receives a liquid absorbent. The biogas stream is dispensed from the second pipe into the first pipe to mix with the liquid absorbent, separating the carbon dioxide from the biogas stream. A first outlet is in fluid communication with the first pipe to deliver a purified biogas stream. A first end of a third pipe extends from the first pipe and a second end of the third pipe extends into a mixed liquid absorbent stream within the first pipe. A second outlet, in fluid communication with the first end of the third pipe, delivers the mixed liquid absorbent stream.

The application discloses an aerobic-anaerobic bacteria combined coal pretreatment biological gas production device, which comprises a gas blowing system, a bacterial population pre-culturing system, an aerobic-anaerobic biological combined pretreatment and gas production system and a gas-liquid two-phase collection and monitoring system. The application also discloses a gas production method of the gas production device. The application takes coal as a substrate, and under suitable conditions, carries out culture and optimization of a methanogenic bacterial population, and simulates indoor biological gas production effects under different coal rank, bacterial type, combined pretreatment mode, treatment time and metabolic environment conditions. The application adopts an integrated combined processor to combine aerobic bacteria and anaerobic bacteria for pretreating coal, so that coal-based biological gas production can be safely and efficiently carried out, and the application has important environmental benefits and broad application prospect.

A biogas slurry filtering system comprising a first tank configured to receive the biogas slurry to be filtered and a mixing device located in the first tank and configured to aerate the biogas slurry. The filtering system also comprising a filter configured to filter the biogas slurry into digestate and filtrate and a controller that controls operation of the filtering system. The filter comprising a filter head located in the first tank at a height-adjustable position. <Figure 1>

A Low Temperature Methane Steam Reforming LTMSR catalyst is based on a non-noble metal, an alkaline earth metal and a rare earth metal combination on a support to produce stable and low temperature methane steam reforming catalysts. The catalyst is suitable for steam reforming mixtures of light hydrocarbons, such as those found in natural gas and bio-gas sources. The output may be configured to provide methane and carbon dioxide in a ratio of around 1:1 by number which is suitable for further processing into end products. The process and catalyst may help show an improved long-term performance by suppressing the fast formation of coke that is well-known to deteriorate the activity of other conventional reforming catalysts. This performance is obtained by controlling the composition and crystalline sizes of the active catalyst components on the selected support and by controlling the reaction conditions.

To provide a control system for biogas power generation facilities and a control method for biogas power generation facilities that enable efficient operation of generators attached to the biogas generation facilities.SOLUTION: A control system for biogas power generation facilities has: an acquisition unit 11 that acquires operational information of a biogas generation facility 2; a gas generation amount prediction unit 12 that predicts an amount of biogas or methane gas generated from the biogas generation facility 2 based on the operational information; a gas consumption calculation unit 13 that calculates a gas consumption target value to be consumed by generators 4a, 4b, ... 4x attached to the biogas generation facility 2 from the gas generation amount prediction value predicted by the gas generation amount prediction unit 12; a number determining unit 14 that determines the number of operating generators 4a, 4b,...4x based on the gas consumption target value; and a power generation control unit 15 that controls starting or stopping of the generators 4a, 4b, ... 4x based on a determination result of the number determining unit 14.SELECTED DRAWING: Figure 1

The invention provides three-cavity synergistic microwave pyrolysis equipment based on waste heat recovery and a working method of the three-cavity synergistic microwave pyrolysis equipment, and belongs to the technical field of microwave heating. A drying cavity, a pyrolysis cavity and a cooling cavity which are longitudinally and vertically distributed are adopted in the equipment and communicate with one another through oppositely-opened closing plates driven by air cylinders, and a vertical flow type channel driven by gravity is formed; and the PLC and the touch display module realize dynamic balance of the material flow and the energy flow according to temperature data fed back by the thermocouples in the cavities. The equipment is integrated with a waste heat recovery module, biogas generated by pyrolysis is introduced into a drying cavity heat exchange pipe bundle through a circulating gas path pipe group for indirect heat exchange, then flows back to a circulating water cooling box again for further cooling, and finally enters a gas washing, drying and filtering barrel for gas washing, dehydration and multi-stage filtering, and it is ensured that pyrolysis gas reaches the standard and is discharged. Through three-cavity cooperation and efficient waste heat recovery, the material treatment efficiency and the energy utilization efficiency are improved, and the overall energy consumption of the system is reduced.

A system for processing biogas, the system comprising: a container, a pressure swing adsorption (PSA) unit housed in the container, the PSA unit having: a plurality of beds containing adsorbent material, the adsorbent material configured to selectively adsorb gas species from the biogas to process the biogas, a rotary valve module for distributing flow of 5 the biogas within the PSA unit, an inlet for supplying the biogas to the plurality of beds from outside of the container, and an outlet for transporting the processed biogas away from the PSA unit.

A waste stream of organic matter such as sewage, plant and plastic matter is received for recycling and treated with high temperature and pressure to generate useful organic products such as bio-oil and gas. Byproducts such as char and an aqueous phase including water can be selectively recycled or beingly discarded. An oxidant added to a reactor containing waste from the waste stream facilitates an autothermal reaction under the temperature and pressure applied to the reactor, boosting the temperature slightly from the reactions therein. The reactor generates useful hydrocarbons such as bio-oil resulting from disruption of organic bonds. A combination of oxidation and radical initiation results from the oxidant and / or radical initiators, and provides an increased yield of bio-oil and substantially pure aqueous phase. A stoichiometric quantity of the oxidant limits complete conversion of carbon into carbon dioxide by limiting available oxygen and therefore favoring hydrocarbon formation.

A method to produce a halogen-depleted gas. The method provides a gas derived from and / or including a source of biogas, mixing the gas with a source of hydrogen to produce a processed gas mixture including an acid, and separating the acid from the processed gas mixture. Sulfur, oxygen, carbon dioxide removal processes are integrated into the method. Production of secondary products, and removal thereof, are included. Pre and post processing may be integrated. Also, production of products from the processed gas.

A method for purifying biogas to biomethane, comprising the following successive steps: (a) passing raw biogas through a first buffer tank (Z1) equipped with a demister and an activated‑carbon filter (F1) and compressing the pre‑purified gas in a compressor (C1) to 6-12 bar; (b) raising the temperature of the compressed biogas to 200–300 °C; (c) removing sulphur compounds in one or more desulphurization reactors (R1, R2) filled with a zinc‑oxide (ZnO) sorbent bed at 200–300 °C; (d) cooling the desulphurized gas to 30–40 °C while condensing and removing liquid; (e) upgrading the cooled gas in a two-stage pressure-swing adsorption (PSA) unit (A1–A8) containing sorbents for CO₂, N₂ and O₂, wherein in the first stage (A1–A4) adsorption is carried out at line pressure, producing biomethane with ≥ 98 vol % CH₄, which is forwarded to a gas grid or to a condensate tank (S1), and in the second stage (A5–A8), vacuum pressure‑swing adsorption (vPSA) is performed at (−1) to 25 kPa, the methane‑rich product being recycled to the suction side of the compressor (C1); and (f) catalytically oxidizing the residual methane contained in the PSA off‑gases in a methane-oxidation reactor (R3) using air, oxygen‑enriched air or pure oxygen.

A biogas reforming system includes a desulfurization part configured to remove sulfur components from biogas, a mixed reforming part configured to produce hydrogen (H2) and carbon monoxide (CO) by performing a mixed reforming reaction on methane (CH4) in the biogas, which has passed through the desulfurization part, with steam (H2O) and carbon dioxide (CO2), a hydrogen separation part configured to separate hydrogen (H2) from a reaction product from the mixed reforming part, and a heat supply part configured to supply heat to the mixed reforming part by combusting the reaction product having passed through the hydrogen separation part, and a part of the biogas having passed through the desulfurization part.

A method of processing biogas that includes obtaining a mobile tank containing biogas at a pressure greater than 1000 psig, connecting the mobile tank to a pressure let down system, and depressurizing the mobile tank to remove biogas therein. The depressurization includes removing gas from the mobile tank using the pressure let down system, and introducing a warming gas into the mobile tank.

A vehicle sensing and control assembly includes a sensing system with at least one infrared sensor. The sensing system determines, using data from the at least one infrared sensor, a measure of a concentration of at least one non-hydrocarbon impurity in the biogas. The assembly further includes a control system configured to control a user communication system, based on said measure, to communicate information relevant to the at least one non-hydrocarbon impurity in the biogas to a user of the vehicle; and / or to generate a control signal for adjusting a configuration of the engine. Additionally provided is a fueling assembly with fueling equipment for delivering biogas into a vehicle storage tank assembly of a vehicle, and the vehicle sensing and control assembly. Further provided is a method and a related computer program for operating a vehicle having a combustion engine configured to enable biogas to be used as fuel.

Methods of controlling hydrogen sulfide concentration of a biogas occupying an anaerobic membrane bioreactor (AnMBR) containing a submerged membrane are disclosed herein. Methods of controlling dissolved sulfide concentration of a mixed liquor within the AnMBR are disclosed. The methods include directing wastewater containing sulfur and a chemical oxygen demand (COD) to an AnMBR, withdrawing at least a fraction of the biogas from the AnMBR, directing a pre-determined amount of the withdrawn biogas to a scrubber, directing a remainder of the withdrawn biogas to a gas distributor, and directing the scrubbed biogas to the AnMBR. Systems for treating wastewater having sulfur and COD are disclosed. The systems include an AnMBR, a scouring gas closed loop, a scrubber, and a control mechanism for directing biogas to the scrubber and to a gas distributor. Methods of retrofitting a system for treating wastewater having sulfur and COD are disclosed.

A biogas collection and purification system that includes a plurality of sources of biogas and a network of conduits configured to convey the biogas from the sources to a central processing facility for processing the biogas into methane. The central processing facility removes impurities to convert biogas to biomethane and may include an H2S removal stage; an activated carbon scrubber; a gas drier; and a carbon dioxide removal stage. The facility also has a biomethane gas compressor configured to deliver the biomethane for use in power plants, for CNG production. Ancillaries to the system include fuel cells for direct electricity generation from biogas / biomethane.