130 results about "Liquid methane" patented technology

The separation of methane from an admixture (110) with ethane and higher hydrocarbons, especially natural gas, using a scrub column (114), in which the admixture is separated into a methane-rich overhead (116) that is partially condensed (122) to provide reflux to the column (114) and liquid methane-depleted bottoms liquid (126), is improved by providing additional reflux (136) derived from an ethane enriched stream (130) from fractionation (128) of the bottoms liquid. Preferably, absorber liquid (140) from the fractionation (128) also is introduced into the scrub column. The vapor fraction (120) remaining after partial condensation can be liquefied (122) to provide LNG product (124).

A process for low-temp separation of methane from coal seam gas and concentrating it includes such steps as removing O2, pressurizing, desulfurizing, decarbonizing, drying. Low-temp separation to obtain liquid methane, flowing in the condenser on the tower top for using it as the cold source of condensing reflux, and flowing the evaporated methane through heat exchanger to obtain product. Its purity is 95-99%. Its recovery rate is 95-99%.

The invention belongs to the technical field of coal chemical industry and particularly relates to a process for coproducing gasified synthetic ammonia and liquefied natural gas (LNG). The invention provides a method and equipment for coproducing the LNG and the synthetic ammonia by using raw coal gas generated by a high-temperature entrained bed; the desulphurization and the decarbonization are carried out by using a mature and advanced physical and chemical absorption process, methane is obtained by using an advanced methanation conversion technology, then, a deep cooling technology is adopted to produce liquid methane and hydrogen through staged cooling and washing separation, the produced liquid methane is outputted as a product, i.e. the LNG, meanwhile, the produced hydrogen is mixed with nitrogen to form a synthetic gas, and the synthetic gas is conveyed to an ammonia synthesizer for the production of the synthetic ammonia after the cold energy is recovered. The coproduction of natural gas and liquid ammonia is achieved, the equipment has corresponding capability for load adjustment, and the emission of vent gas in synthesis is not needed, so that the raw coal gas is maximally used in the production of products.

A novel method and system for liquefying and distilling natural gas into high purity liquid methane (LNG) and NGL product streams. Heat exchangers and distillation towers are configured to produce high purity liquefied natural gas (LNG) and NGL product streams, while also rejecting excess nitrogen contained in the inlet gas stream, utilizing liquid nitrogen as the process refrigerant. A molecular sieve pretreatment system is configured to utilize the vaporized nitrogen stream for regeneration of the molecular sieve beds which are designed for removing water and carbon dioxide from the inlet gas stream

The invention provides a low-temperature propellant supplying system, a method and a device. The low-temperature propellant supplying system comprises a nitrogen blowing away system, an oxidant supplying system, a fuel supplying system and a low-pressure liquid oxygen cooling system; the nitrogen blowing away system is used for carrying out purging operation on a system pipeline before and after an experiment and detecting the air tightness of the low-temperature propellant supplying system; under the condition that the air tightness of the low-temperature propellant supplying system is qualified, the oxidant supplying system is used for conveying liquid oxygen to an engine thrust chamber; the fuel supplying system is used for conveying liquid methane to the engine thrust chamber; the low-pressure liquid oxygen cooling system is used for cooling a pipeline, wherein partial pipeline is located between an electromagnetic valve (A15) and the engine thrust chamber and partial pipeline is located between an electromagnetic valve (B15) and the engine thrust chamber. According to the embodiment of the supplying system, the method and the device, the required preset temperature can be achieved before the test, the low-pressure liquid oxygen cooling system adopts low-pressure liquid oxygen to cool the environment so as to ensure the safety, the propellant conveying amount can be stablyadjusted, and simplicity and reliability are achieved.

The present invention relates to a new process for producing methane chloride by using liquid-phase catalytic method and pressurization process. The hydrogen chloride and methyl alcohol are mixed according to a certain ratio, then placed in a tank reactor with catalyst, and under the condition of a certain temp. and pressure the invented methane chloride can be synthesized. It adopts acid/water washing and alkali-washing processes to remove unreacted methyl alcohol and hydrogen chloride, and adopts concentrated sulfuric acid washing process to remove residual water content and reaction by-product dimethyl ether, then the purified and dried methane chloride gas is undergone the processes of compression and condensation so as to obtain high-purity liquid methane chloride product.

The invention relates to a methane-producing composite microbial inoculum and a preparation method thereof, which can solve the long-standing difficult problems that the existing biogas digester is lack of high-efficient methane-producing bacteria, thereby resulting in long initial start-up time of biogas production and poor stability of the biogas production. Methanosarcina acetoacidophilum DSM-N0.2834, methanobacterium formicicum DSM-No.1535, methanobrevibacter arboriphilicus DSM-No.1125, methanolobus tindarius DSM-No.2278 and methanothrix concilii DSM-No.6752 collected in German collection of microorganisms and cell cultures are adopted and inoculated in a liquid methane bacterial culture medium under the anaerobic condition, the independent enlarged culture is carried out grade by grade respectively, and bacterial liquid after the cultured methane bacteria is mixed together according to the volume ratio, thereby preparing a liquid methane-producing composite microbial inoculum; and the liquid methane-producing composite microbial inoculum can also be prepared into a solid methane-producing composite microbial inoculum. The method has reasonable design and adopts the high-efficient strains with the optimal combination and the rapid propagation technology, and the developed high-efficient methane-producing composite microbial inoculum can significantly accelerate the start-up time of the biogas production when in new construction of the biogas digester and large material change, and improve the efficiency and the stability of the biogas production of the biogas digester.

The invention discloses a power system for a carrier rocket upper stage and an orbit transfer vehicle. The power system for the carrier rocket upper stage and the orbit transfer vehicle solves the existing problems that a main engine and an attitude control engine are relatively independent, the carrying burden is relatively heavy,a propellant used in the attitude control engine is rather toxic,and the environment and safety of a human body are seriously threatened. The power system for the carrier rocket upper stage and the orbit transfer vehicle comprises the main engine and the attitude control engine; a propellant tank of the main engine can simultaneously deliver a propellant to a thrust chamber of the main engine and a thrust chamber of the attitude control engine under the action ofa propellant supply system of the propellant tank, and liquid oxygen is used as an oxidant of the propellant; kerosene, or liquid hydrogen or liquid methane is used as an incendiary agent; the detoxication of the attitude control engine is achieved, and integration of the homologous propellant of the main engine and the attitude control engine is achieved; a propellant tank of the attitude control engine can be supplemented after operation through the main engine; and the propellant dosage carried by the attitude control engine during flight can be reduced, thus the weight of the overall system is lowered, and the payload of a carrier is greatly increased.

The invention provides a method and system for exploiting seabed flammable ice. The method comprises the steps that two shafts are drilled through a drilling platform and reach a seabed flammable ice layer, the depths of the two shafts are different, the distance between the two shafts is small, two cavities are formed in the bottom of the shafts through explosives in an exploded mode, the two cavities are communicated, high-temperature sea water is constantly poured into the bottom of the deeper shaft, so that methane is changed into the gaseous state from the solid state, gaseous methane is jetted from the other shaft, moistures are eliminated through pressurization and cooling, the temperature is lowered to minus 162 DEG C in a refrigerating mode through a nitrogen compressor, so that liquid methane is formed, or the methane is made into flammable ice again to be stored, and part of methane is used as fuel for heating sea water. The method and system for exploiting the seabed flammable ice has the advantages that as long as pouring of the high-temperature sea water is stopped, the flammable ice can stop decomposition, insulation measures are applied to pipes and containing tanks, and therefore waste of heat energy cannot be generated; power is supplied by a diesel generator, the manufacturing cost is low, and operation is reliable; the method for exploiting the seabed flammable ice belongs to the gap permeation substitution method, and seabed collapse cannot be caused; emission only comprises carbon dioxide, and other waste is used for seabed backfilling and recycled.

The invention relates to the field of low-temperature gas separation, in particular to a system and method for preparing high purity carbon monoxide and hydrogen-enriched co-production liquid methane. The system mainly comprises a raw material gas purification unit, a low-temperature liquefying separation unit, a CO product compressor and a mixed refrigerant compressor. The low-temperature liquefying separation unit comprises a main heat exchanger, a methane washing tower, a dehydrogenation tower, a demethanization tower and a denitrification tower. A first evaporator is arranged at the bottom of the dehydrogenation tower; a second evaporator is arranged at the bottom of the demethanization tower; a first condenser is arranged on the top of the demethanization tower; a third evaporator is arranged at the bottom of the denitrification tower; and a second condenser is arranged on the top of the denitrification tower. According to the system and method, while high purity products rich in H2 and CO are obtained through four-tower process flow, high purity liquid methane can be obtained; the adaptability of a device to raw material gas is high; the requirement for raw material gas purities of the device is lowered; and part of CO is extracted from the tail stage or the middle stage of the CO product compressor to be used as a cold source and a heat source of a rectifying tower circularly according to the pressure of CO product gas, a nitrogen compressor and an expander are omitted, the number of devices is small, and the investment is small.

Methods and systems for removing nitrogen from a natural gas feed stream. The systems and methods generally include a heat exchange unit, a separation unit, and a liquid methane pump unit, where the separation unit produces a liquid methane bottoms stream and a gaseous overhead stream enriched in nitrogen and the liquid methane pump unit compresses the liquid methane bottoms stream and then pumps the stream through the heat exchange unit to cool a natural gas feed stream. In some embodiments the liquid methane pump unit is a sleeve bearing type unit. Beneficially, the disclosed systems and methods incorporate high head pumps for liquid methane compression instead of vaporizing the liquid methane and compressing it in a gaseous compression units that are typically used for this purpose, saving space, materials, and power.

The invention discloses a method for preparing liquefied natural gas by using coke-oven gas, which mainly comprises the steps of methanation reaction, rectification separation and liquefaction, wherein the methanated gas first enters a rectification column after heat exchange and cooling; a tower kettle reboiler is heated by the methanated gas; liquid methane flows to an overhead condenser to evaporate to provide cold; under the rectification action of the rectification tower, methane with a purity of over 99.5 percent is obtained and a mixture of H2, N2 and a small amount of methane is obtained in the tower top; and the methane is heated again and delivered to a liquefying device to be liquefied. The method has the advantages that: the separation and liquefaction are separate, so the operation is smooth and flexible; LNG and methane gas can be output; the refrigerant is derived from the product methane rather than external supply, so investment is reduced and the cost for other refrigerants is saved; and in addition, according to an preferred scheme, a rear methane expander is adopted, the amount of methane entering the methane expander is increased and the refrigerating capacity is increased, so a circulation ratio is reduced to 4.0 to 4.5.

The invention discloses a method for recovery of light hydrocarbons and co-production of LNG from tail gas of Fischer-Tropsch synthesis. The method comprises the following steps: tail gas from a Fischer-Tropsch synthesis unit passes through a supercharging decarburization unit to remove a CO2 component and then remove H2O therein; the purified tail gas is cooled and then enters a dethanizer; light hydrocarbons are removed from the tail gas in the dethanizer, cooled at the bottom of the dethanizer and then enters a downstream process unit; the tail gas at the top of the dethanizer enters a demethanizer; liquid methane flows out of the demethanizer and cryogenic treatment is continuously carried out to obtain LNG which enters an LNG storage tank; after the tail gas at the top of the demethanizer is reheated, H2, CO and N2 therein are separated; a separated permeate gas with an appropriate H2/CO ratio returns the Fischer-Tropsch synthesis unit or a PSA hydrogen production device; and the N2-containing tail gas is emptied or used as a fuel gas. By the use of the method for recovering light hydrocarbons from the tail gas, operating cost of the device can be reduced effectively, yield of hydrocarbon products is raised, and LNG is coproduced. Then, good economic benefit can be obtained.

The invention belongs to the technical field of preparation of metallurgical reduction gas, and relates to a method for preparing high methane gas through industrial exhaust gas containing carbon and hydrogen, in particular to a process for preparation of metallurgical reduction gas and co-production of liquefied natural gas through coke gas. According to the process, coke gas serving as a raw material is subjected to pre-purification to roughly remove impurities such as tar and naphthalene, then the processed coke gas is introduced into a gas tank for buffering, the buffered coke gas is introduced into a compressor for pressurizing, deep purification is conducted on the pressurized coke gas to remove tar and naphthalene, benzene and ammonia in the processed coke gas are removed via a TSA procedure, CO2, H2S and water are removed through liquefied pre-purification, then high H2 is obtained through membrane separation, residual gas enters a liquefaction unit, and separation is carried out to obtain carbon monoxide gas and byproduct liquid methane. Through the process, coke oven gas resources are fully utilized, and byproduct liquefied natural gas (LNG) is obtained while the metallurgical reduction gas is obtained, so that the economic benefits are obvious.

The invention discloses a method and a device for purifying ammonia synthesis virgin gas and co-generating SNG (synthetic natural gas) or/and LNG (liquefied natural gas) via liquid nitrogen washing, wherein by the addition of a methane rectification tower and a liquid methane pump in a conventional liquid nitrogen washing device, and a reasonable line configuration, a methane-rich fraction can be re-heated and then used as a city gas and output; the methane-rich fraction can also be cyclically refrigerated via Claude and used for producing the LNG product; simultaneously, a product adjustment can be performed on SNG and LNG according to different used loads.

The invention relates to a system and method for preparing hydrogen rich gas and liquid methane. The system mainly comprises a purge gas purification unit and a low-temperature liquidation and separation unit. By means of mixed refrigerant compression circulating refrigeration, nitrogen circulation compression refrigeration and waste gas expansion refrigeration, hydrogen rich gas and liquid methane are obtained by conducting rectification and separation on synthesis ammonia or methyl alcohol purge gas in an efficient rectifying tower, the flow is simple, the energy consumption is low, and the recovery rate is high. The system and method for preparing hydrogen rich gas and liquid methane are high in reliability, low in running cost and high in product purity.

The invention relates to a supercritical carbon dioxide high-temperature and high-pressure PVT testing and methane displacement integrated experimental device and method. The device comprises a liquidcarbon dioxide storage tank, a liquid methane storage tank, a displacement pump, a core holding unit, a constant-temperature oil bath system, a PVT barrel, a ring pressure generation device, a pressure difference sensor, a flow sensor, a pressure sensor, a temperature sensor, a sodium hydroxide absorption storage tank and a gas storage tank, wherein the liquid carbon dioxide storage tank and theliquid methane storage tank are separately connected to an inlet of the PVT barrel via a first pipeline, a second pipeline and a third pipeline; an outlet of the PVT barrel is connected with an inletof the core holding unit through a fourth pipeline; a manifold tee is separately connected with the outlet of the core holding unit, the inlet of the sodium hydroxide storage tank and the third pipeline through a fifth pipeline, a sixth pipeline and a seventh pipeline; and the outlet of the sodium hydroxide storage tank is connected with the gas storage tank through an eighth pipeline. By the supercritical carbon dioxide high-temperature and high-pressure PVT testing and methane displacement integrated experimental device and method, the changing law of the phase state, viscosity and displacement efficiency of supercritical carbon dioxide at a high temperature and under high pressure along with the temperature and pressure can be researched.

The invention relates to a flexible composite laminate (9) forming covering strip of a secondary cryogenic sealing barrier for container containing liquid methane, the secondary cryogenic sealing barrier comprises a flexible laminate belt adhered with a seam of a synthesis plate covered by another lower composite laminate. The invention also relates to a method for assembling the secondary barrier by adhering. The flexible composite laminate (9) is adhered to the seam of the adjacent synthesis plate covered by the lower laminate (7), the laminates comprise a metal foil dipped with an adhesion inserted between two fabrics. According to the invention, The flexible composite laminate is precoated with an adhesive by using a hot melt adhesive (208) cured by heat input, the hot melt adhesive is applied to tissues (9a) at a softening temperature to cover the external tissue of each lower laminate, and a peripheral edge (115) of the flexible laminate, the adhered assembly obtained by curing the adhesive contacted with the lower laminate by heating under the pressure condition, especially has improved mechanical strength and prevent the micro leakage of the low temperature liquid.

The invention relates to a method for extracting hydrogen and methane from coke oven gas by utilizing membrane separation and low-temperature rectification, comprising: the coke oven gas is compressed to be 0.12-0.15MPa, after the temperature is cooled to 20-40 DEG C, sulphur, benzene and tar are removed; the coke oven gas is compressed to be 2.2-4.0MPa, H2S is removed by hydrolysis; CO2 is removed by a N-methyldiethanolamine wet process, sulfide, mercury, moisture and compounds with more than five carbons are removed by an adsorptive process; and then the coke oven gas enters in a membrane separation device under 1.5-4.0MPa at 20-60 DEG C, hydrogen is separated from CH4, N2 and CO, and the separated hydrogen is compressed to be 2.0-5.0MPa and enters in a liquid hydrogen device to obtain the liquid hydrogen; the coke oven gas enters into a changing-over plate heat exchanger and the residual substances with above -50 DEG C of boiling point in the coke oven gas are removed by reducing the temperature; the coke oven gas enters in a low-temperature rectification tower, and liquid methane containing C1, C2 and C3 is extracted from the tower bottom, the purity can reach 98 percent, the content of the carbon monoxide is less than 05 percent, and the liquid methane is heated to be gaseous methane.

The invention relates to a vehicle-mounted methane freezing, liquefying and separating device which comprises a nitrogen compressor, a condenser, a compressed nitrogen storage pot and a nitrogen swelling, freezing and separating cabin. The device is characterized in that the nitrogen compressor, the condenser, the compressed nitrogen storage pot and the nitrogen swelling, freezing and separating cabin are uniformly arranged on a truck, wherein the nitrogen swelling, freezing and separating cabin is respectively provided with a methane inlet and a water outlet and respectively communicated with a normal pressure nitrogen storage bag, the compressed nitrogen storage pot, a liquefied and vulcanized hydrogen storage pot, a liquid methane storage pot and a liquid carbon dioxide storage pot; the normal pressure nitrogen storage bag is communicated with the compressed nitrogen storage pot through a nitrogen compression device via a cooler; and the nitrogen compressor is connected with a methane generator through a gear box. The device has the advantages of flexibility, light weight, convenience, movability and convenient running, reduces the transportation cost and the power cost of straw raw materials and methane dreg waste and can be used for recovering carbon dioxide and realizing low-carbon agricultural development. Moreover, the device increases the side product income of methane processing and also has the advantages of income increase, energy saving and environmental protection.

A technology for production of gasoline and combined production of natural gas and hydrogen through methanol synthesis of coke oven gas comprises the following steps: carrying out low temperature methanol washing on the coke oven gas to remove sulfur and carbon dioxide, carrying out deep cold methane separation on sulfur and carbon dioxide removed coke oven gas, sending a separated liquid methane product to an LNG storage tank, dividing the remaining coke oven gas into two parts, sending the first part to pressure swing adsorption to remove hydrogen sent to a gas cabinet as a product, mixing a pressure swing adsorption stripped gas with the second part of the coke oven gas going through a lateral line, further desulphurizing, mixing the obtained desulphurized gas mixture with parts of the carbon dioxide gas obtained after the low temperature methanol washing, a circulating gas of a methanol separator and parts of a circulating gas of a circulating gas compressor, carrying out methanol synthesis, carrying out an oil synthesis reaction, and carrying out oil product separation to obtain a fuel gas, liquefied petroleum gas, heavy oil and gasoline. The technology has the advantages of simple process flow, less device investment and low energy consumption.