149 results about "Biogenic gas" patented technology

Methods of stimulating biogenic production of a metabolic product with enhanced hydrogen content are described. The methods may include accessing a geologic formation that includes carbonaceous material. The methods may also include introducing an amendment to the geologic formation. The amendments may further include removing compounds with enhanced hydrogen content from the formation.

The invention provides a method for depriving sulfureted hydrogen in biogas, which is characterized by comprising the following steps: firstly, introducing the biogas into a bubble column plate absorption oxidation device, and absorbing sulfureted hydrogen in the biogas by utilizing sprayed absorption solution containing an oxidant; secondly, controlling the air velocity in a hollow tower of the bubble column plate absorption oxidation device to be 0.2-1.5m / s, wherein the height of the liquid on a plate grid is 0.2-0.8m; and finally sending the biogas absorbed by absorption solution to a subsequent dry-type desulfurizing tower, a wet-type desulfurizing tower or a biological desulfurizing tower for depriving sulfureted hydrogen further. The invention also discloses three devices for depriving sulfureted hydrogen in the biogas by utilizing the combination of the bubble column plate absorption oxidation devices, a desulfuration device using the common dry method and wet method. The invention has simple method, and can effectively and quickly carry out desulfuration at constant pressure.

The invention is an apparatus and method to remove hydrogen sulfide and siloxanes from biogas and destroy the contaminants in microwave reactors. Hydrogen sulfide and siloxane are removed from biogas using an adsorbent media such as activated carbon. The media is regenerated in a microwave reactor where the hydrogen sulfide and siloxane are removed in a sweep gas. In one process, siloxane is oxidized to silicon dioxide in a second microwave reactor and removed with a filter. Hydrogen sulfide if first oxidized to sulfur dioxide, then reduced to sulfur in a third microwave reactor and removed with a filter. In another process, siloxane is combined with water to form silicon dioxide and hydrogen sulfide is reduced to elemental sulfur in a microwave reactor. These reactants are removed with a filter. The remaining sweep gas containing hydrogen and low molecular weight hydrocarbons is returned to the biogas stream.

The invention belongs to the field of environment protection, and in particular relates to an optimization design method of an anaerobic continuous flow agitator bath type biological hydrogen production reactor. The method comprises the following steps: researching reactor internal flow field characteristics of different types of stirring paddles under the conditions of different paddle-bath diameter ratios and different agitating speeds and influence on hydrogen production process, by using a numerical simulation software based on computational fluid mechanics technology; obtaining detailed flow field information, such as velocity field, turbulence energy and dissipation rate thereof, biogas integration rate and shearing rate distribution by adopting a two-phase flow model, and analyzing and comparing different flow field information obtained through simulation according to influence on hydrogen production process by the various flow field information, thereby determining an optimal stirring paddle style and agitating speed combination, and providing an effective method for the optimization design of the agitator bath reactor. The optimization design method of the anaerobic continuous flow agitator bath biological hydrogen production reactor is mature in technology, avoids the blindness of hydraulic design of the reactor using an empirical or semiempirical association method, and has the advantages of being visual in optimization cycle effect and short in optimization cycle, saving cost, and the like.

Methods of stimulating biogenic production of a metabolic product with enhanced hydrogen content are described. The methods may include accessing a consortium of microorganisms in a geologic formation that includes a carbonaceous material. They may also include providing hydrogen and one or more phosphorous compounds to the microorganisms. The combination of the hydrogen and phosphorous compounds stimulates the consortium to metabolize the carbonaceous material into the metabolic product with enhanced hydrogen content. Also, methods of stimulating biogenic production of a metabolic product with enhanced hydrogen content by providing a carboxylate compound, such as acetate, to a consortium of microorganisms is described. The carboxylate compound stimulates the consortium to metabolize carbonaceous material in the formation into the metabolic product with enhanced hydrogen content.

The invention relates to the biogenetic gas purification field, in particular to a biogenetic gas purifying equipment and a purifying technique. The equipment comprises an absorption tower, a desorption tower, a reboiler, a heat exchanger, a cooler, a separator, an absorbent holding tank and a pump. The invention is characterized in that: firstly, the absorption tower is a different diameter tower featuring with small upper section and large lower section and the upper-and-lower tower diameter ratio ranges between 0.75 and 0.85; secondly, a catcher with metal mesh is added inside the former material gas inlet of the adsorbption tower; thirdly, a fiber rod filter is arranged at the outlet of the rich solution outlet of the absoption tower. The technique adopts the water solution as the absorption solution with MEDA main solute and multi-amine activator, and the operation parameters are 30 kPa to 40 kPa operation pressure inside the tower ranges, 45 DEG C. to 55 DEG C. temperature at the tower top of the tower and 50 DEG C. to 60 DEG C. at the bottom, 25 to 35 (m3G / m3L) gas-liquid ratio, 2.56 to 4.28Kmol per m3 absorption solution concentration, and 1 to 2.5LCO2 per L lean solution concentration. The invention is used to remove the impurities of CO2, H2S, HCN and the organic sulfur from the biogenetic gas, coal bed gas and coke-oven gas to meet the purification requirement.

The invention provides a method for determining a gas production rate of an organic matrix in a biochemical gas production stage, and belongs to the technical field of oil and gas resource evaluation. The method comprises the following specific steps: collecting four characterization parameters of a source rock in the biochemical gas production stage of one area, namely residual hydrocarbon amount of chloroform bitumen "A", vitrinite reflectance Ro reflecting the thermal evolution degree of the source rock, organic carbon content TOC and burial depth h; establishing a graph of relation of "A" / TOC and Ro or h according to the characterization parameters of the source rock; determining the exhaust threshold of a biogenic gas according to the graph, wherein the value at the threshold is "A"<0> / TOC<0>; calculating the restoration index of the hydrocarbon generation rate of the source rock according to "A" / TOC and "A"<0> / TOC<0> under different Ro or h conditions, and calculating the total hydrocarbon generation rate of the source rock under a variety of maturity conditions through the index and the "A"<0> / TOC<0>; calculating the gas production rate of the biogenic gas of the source rock according to the difference value of the total hydrocarbon generation rate and the residual hydrocarbon rate. By adopting the method, the problems of the original methods of calculating gas production rate, such as simulation experiment and the like are solved, and important technical support is provided for biogenic gas resource evaluation.

Granulated Activated Carbon (GAC) is used to remove hydrogen sulfide (H2S) from the biogas produced in an anaerobic digester. The cleaned biogas is then combusted in a reciprocating engine. The exhaust of the engine is passed through a heat exchanger and then through GAC in an adsorber to adsorb nitrogen oxides (NOx) and any sulfur oxides (SOx). The GACs containing NOx, H2S, and SOx, are transported to a microwave reactor, mixed, and exposed to microwave energy. The H2S and NOx are desorbed from the GAC and chemically combined to produce nitrogen, carbon dioxide, sulfur and water. Unreacted nitrogen oxides or hydrogen sulfide are transported to a second reactor containing carbon media to be reacted by a further microwave process. Sulfur is removed with a filter as a solid and the remaining inert components are vented to the atmosphere. The GAC is regenerated and reused to remove additional H2S and NOx.

Methods of stimulating biogenic production of a metabolic product with enhanced hydrogen content are described. The methods may include accessing a consortium of microorganisms in a geologic formation that includes a carbonaceous material. They may also include providing a phosphorous compound to the microorganisms. The phosphorous compound stimulates the consortium to metabolize the carbonaceous material into a metabolic product with enhanced hydrogen content. Also, methods of stimulating biogenic production of a metabolic product with enhanced hydrogen content by providing a yeast extract amendment to a consortium of microorganisms is described. The yeast extract amendment stimulates the consortium to metabolize carbonaceous material in the formation into the metabolic product with enhanced hydrogen content.

Biogas released from landfills and sewage treatment plants is freed of siloxane contaminants by passing the biogas through a bed containing activated alumina, which absorbs the siloxanes. When the activated alumina becomes saturated with siloxanes, the absorption capability of the activated alumina can be recovered by passing a regeneration gas through the bed of activated alumina. A system containing two or more beds of activated alumina can use one bed to remove siloxanes from biogas while one or more of the other beds are being regenerated.

The invention relates to a method for controlling a gas separation system comprising membrane separation stages, a system controlled by said method and use of said system for separation of gas mixtures, in particular in the preparing of biogas or natural gas or synthesis gas.

The invention relates to a biological gasifying furnace, and belongs to the technical field of furnaces. The biological gasifying furnace comprises a furnace body, at least one cleaning hole opening and closing device, a purifying cylinder, an adapting pipe and a fuel gas lead-out device, wherein the furnace body consists of a base, a furnace chamber and a spacer bush, the base corresponds to thelower part of the furnace chamber, the lateral part is provided with a cleaning hole, and the spacer bush is formed between the inner wall of the furnace body and the outer wall of the furnace chamber; the cleaning hole opening and closing device is arranged on the cleaning hole; the purifying cylinder is provided with a filter material chamber, the top of the purifying cylinder is provided with a filter material intake which is matched with a first opening and closing door, the bottom of the purifying cylinder is provided with a tar hopper of which the bottom is provided with a valve, the lower lateral part of the purifying cylinder is provided with a filter material outlet which is matched with a second opening and closing door, the bottom of the filter material chamber is provided witha filter material cushion, and a bleed air chamber is formed between the filter material cushion and the tar hopper; one end of the adapting pipe is connected with the furnace body and communicated with the spacer bush, while the other end is connected with the lower lateral part of the purifying cylinder and communicated with the bleed air chamber; and the fuel gas lead-out device is connected and communicated with the purifying cylinder. The biological gasifying furnace has the advantages of making biological energy source utilized effectively and protecting the environment.

A process wherein a gas mixture of a reformate gas comprised predominantly of hydrogen and carbon oxides, and a biogas comprised predominantly of methane and carbon dioxide is passed through a pressure swing adsorption unit. Contaminants, such as carbon oxides, are adsorbed and a methane-rich stream and a hydrogen-rich stream are separately recovered. The methane-rich stream is sent to steam methane reforming that results in a reformate comprised primarily of hydrogen which is then combined with the biogas feed stream and sent to pressure swing adsorption.

The invention relates to an organically modified molecular sieve and a preparation method and application thereof, belonging to the technical field of adsorbents. To overcome technical problems in theprior art, the invention provides the preparation method of the organically modified molecular sieve. The method comprises the following steps: impregnating a molecular sieve with an organic matter solution, performing solid-liquid separation, and drying the obtained solid to obtain the modified molecular sieve. According to the invention, the molecular sieve is subjected to impregnation modification so as to successfully prepare the organically modified molecular sieve; the preparation method is simple and controllable in process, low in energy consumption and low in cost; the obtained modified molecular sieve can be used as a selective adsorbent for N2 / CH4, O2 / CH4, (N2 + O2) / CH4 and other systems; in particular, when the modified molecular sieve is used for separation of N2 / CH4, the adsorption amount of CH4 is low, and the separation ratio of nitrogen to methane is large; and the modified molecular sieve can be applied to purification of methane in coalbed methane, oilfield gas or biogas.