501results about "Hydrogen separation using liquid contact" patented technology

The present application relates to hydrogen production technology field, especially to a kind of methanol hydrogen production method, comprising the following steps: S10: methanol water is heated and vaporized to obtain methanol water vapor;S20: methanol reforming reaction obtains hydrogen mixture gas;S30: after cooling treatment to hydrogen mixture gas, through water washing tower absorption unreacted methanol water, then, adjust the relative humidity and temperature of hydrogen mixture gas;S40: hydrogen mixture gas is input into carbon dioxide absorption tower to remove carbon dioxide;S50: after removing carbon dioxide, product hydrogen is obtained and input hydrogen tank storage to supply user end.The above-mentioned methanol hydrogen production method, by methanol water vapor reforming hydrogen treatment, obtains hydrogen mixture gas.Again, hydrogen mixture gas is purified to obtain product hydrogen with very low carbon monoxide content, with raw material easy to transport, the hydrogen purity of output is high, equipment construction cost is low, and energy consumption is low and the like advantages, reach the purpose of expanding hydrogen application range.

The invention discloses a gas-liquid separation and washing integrated device and method for hydrogen production through water electrolysis. The device comprises a hydrogen side gas-liquid separation unit, a hydrogen side washing unit, an oxygen side gas-liquid separation unit, an oxygen side washing unit and a pressure balance unit. The hydrogen side gas-liquid separation unit is coupled with the hydrogen side washing unit, the oxygen side gas-liquid separation unit is coupled with the oxygen side washing unit, and the hydrogen side gas-liquid separation unit is coupled with the oxygen side gas-liquid separation unit through the pressure balance unit. According to the invention, the gas-liquid separation and washing processes of the hydrogen-oxygen electrolyte are integrated in one device, so that the number of the whole equipment of the process for producing hydrogen by electrolyzing water is reduced, the complexity of the whole process is reduced, and the compactness of the process equipment is improved, thereby improving the whole operation efficiency of the process. And hydrogen and oxygen are separated at the same time and collected separately, so that the process requirements and safety specifications of gas-liquid separation of the hydrogen-oxygen electrolyte in a water electrolysis hydrogen production process are well met, and the operation efficiency of the whole hydrogen production process is improved.

A gas-liquid separation apparatus includes a tank and a flow reducing component. An inlet is formed in a middle of the tank. A hydrogen outlet is formed in a top of the tank. A processing chamber connected to the inlet. The flow reducing component is formed in the processing chamber and maintained above the inlet. The flow reducing component forms a flow reducing space and a flow partition chamber in a part of the processing chamber above the inlet, a gas-liquid initial separation space in the processing chamber and below the flow reducing component, at least one connection hole and a connection channel. The flow partition chamber is connected to the flow reducing space through the at least one connection hole. The gas-liquid initial separation space is connected to the flow partition chamber through the connection channel. The flow reducing space is arranged to be connected to the hydrogen outlet.

Processes and apparatus for low-CO2 emissions methanol production using a high efficiency (>90%) reformer fired with a low-carbon fuel (C:H<0.03) to produce syngas. CO2 is removed from the syngas, and the CO2-lean syngas is fed to a methanol synthesis loop. A purge stream from the methanol synthesis loop is processed to recover a hydrogen-rich stream and a tail gas stream. The hydrogen-rich stream is supplied as fuel to fire the reformer, along with a portion (<10%) of the tail gas, to produce a CO2-lean flue gas (<3 vol %, dry basis). The flue gas is optionally cooled below a dew point to form condensate, which can be collected and removed. The methanol production can have a carbon efficiency of 97% or more, and a CO2 emissions reduction (compared to natural gas firing) of 88% or more.

Reduction of the water content of ammonia used in an ammonia cracking process allows the use of water intolerant cracking catalysts. The water removal process can also be used to recover and recycle ammonia from the cracked gas.

The invention provides a system for removing an acid gas from syngas with enhanced heat recovery, the system including an acid gas absorber containing a solvent and having an inlet positioned to receive a syngas stream, the acid gas absorber producing an acid gas enriched solvent effluent; a first heat exchanger positioned to exchange heat between the syngas stream upstream of the acid gas absorber and the acid gas enriched solvent effluent; and an acid gas stripper positioned to receive the acid gas enriched solvent effluent from the first heat exchanger, the acid gas stripper producing a lean solvent effluent having reduced acid gas content. The invention also provides a method for removing an acid gas from syngas with enhanced heat recovery, which involves heating an acid gas enriched solvent effluent through heat exchange with a syngas stream upstream of an acid gas absorber.

The invention relates to a process (100, 100', 100") and an apparatus for producing a hydrogen-containing product, wherein, in a production operating mode, an ammonia feed (1, 2) is reacted with catalytic assistance in an ammonia cracker (20), to which heat is supplied, to obtain a cracking gas (3, 4) containing ammonia, hydrogen, and nitrogen. A characteristic feature is that the ammonia cracker (20) can also be operated in a standby operating mode, wherein the cracking gas (3, 4) or a portion thereof is recycled as feed to the ammonia cracker (20).

To provide a dry water electrolysis hydrogen gas producing device capable of smoothly producing dry water electrolysis hydrogen gas even at restart-up time.SOLUTION: Provided is a dry water electrolysis hydrogen gas producing device that includes a water electrolysis device, an absorber that brings the obtained wet water electrolysis hydrogen gas into contact with an absorbent liquid to obtain dry water electrolysis hydrogen gas and wet absorbent liquid, a storage device, a regenerator that brings the wet absorbent liquid into contact with dry hydrogen gas for regeneration (water electrolysis dry hydrogen gas) to obtain dry absorbent liquid and wet regeneration hydrogen gas, a diverter valve that circulates part of the dry water electrolysis hydrogen gas in the storage device side and the remainder in the regenerator side, a vacuum pump connected to the regenerator, and a three-way switching valve placed between the regenerator and the vacuum pump to switch the gas flow direction to either the vacuum pump side or the water electrolysis device side, when the device is stopped, the flow direction of the three-way switching valve is switched to the vacuum pump side, and when the device is started, the flow direction of the three-way switching valve is switched to the water electrolysis device side.SELECTED DRAWING: Figure 1

A method for converting carbon dioxide gas to liquefied carbon dioxide includes (a) receiving, in a heat exchanger, a carbon dioxide gas stream and a liquefied natural gas stream, and (b) exposing the carbon dioxide gas stream to the liquefied natural gas stream to convert the carbon dioxide gas stream to liquefied carbon dioxide, and the liquefied natural gas stream is regasified to natural gas. The natural gas exits the heat exchanger and is sent to a steam methane reformer for further processing.

To provide a process and an apparatus for the production of hydrogen gas from ammonia, and a use of the apparatus, so that the overall process has improved modularity while the process is made simple and has the optimized cost and conversion rate.SOLUTION: The invention relates to a process for the production of hydrogen gas (4) from ammonia, thereby obtaining an effluent gas (6) including hydrogen gas. The process includes the steps of providing an ammonia feedstock stream (8) and performing at least one electrical heating and conversion step, the step including: heating in at least one electric heater (12) the ammonia feedstock stream so as to produce a heated gas stream (14); and performing in at least one adiabatic reactor (16) an endothermic cracking reaction of the heated gas stream (14). The adiabatic reactor includes at least one catalyst bed (18) performing the endothermic cracking reaction of the ammonia feedstock stream into the effluent gas.SELECTED DRAWING: Figure 1

A plant and process for producing a hydrogen rich gas are provided, said process comprising the steps of: reforming a hydrocarbon feed in a reforming step thereby obtaining a synthesis gas comprising CH4, CO, CO2, H2 and H2O; shifting said synthesis gas in a shift configuration including a high temperature shift step; removal of CO2 upstream hydrogen purification unit, such as a pressure swing adsorption unit (PSA), and recycling off-gas from hydrogen purification unit and mix it with natural gas upstream prereformer feed preheater, prereformer, reformer feed preheater or ATR or shift as feed for the process.

A device and method for producing hydrogen by biomass gasification, relating to the technical field of producing hydrogen by biomass gasification, comprises a gasifier, a primary cyclone separator, a cracking furnace, a heat recovery device, a secondary cyclone separator, a filter, a water washing unit, a desulfurization unit, a conversion unit, a pressure swing adsorption unit, a return device, a steam drum, an ash hopper I and a fly ash cooler; a distribution plate is arranged in the gasifier, and a biomass feed port is arranged above the distribution plate; a slag discharge ring pipe is connected at the central notch of the cone bottom of the distribution plate of the gasifier, and a gasifying agent nozzle is arranged in the slag discharge ring pipe; a gasifying agent inlet is arranged in the gas chamber area of ​​the gasifier; a dense phase section and a dilute phase section are arranged from bottom to top above the distribution plate of the gasifier; the top outlet of the gasifier is connected with the inlet of the primary cyclone separator, and the scheme greatly increases the primary conversion efficiency of the fly ash, and correspondingly reduces the invalid fly ash circulation amount between the gasifier and the primary cyclone separator.

The invention discloses a low-pressure gas hydrogen recycling device in a diesel hydrogenation preparation process, belongs to the technical field of low-pressure gas recycling, and provides the following scheme that the low-pressure gas hydrogen recycling device comprises a desulfurization mechanism, and a pressurization mechanism is arranged on the desulfurization mechanism; the hydraulic assembly is driven by the control assembly to conduct hydraulic transmission, so that the sealing plug can move, the sealing plug moves to conduct pressurization operation on a closed space formed by the spiral flow guide channel and the spray head set, and after pressurization is conducted for a period of time, the exhaust assembly makes contact with a baffle to be automatically opened for exhausting; the connecting assembly drives the exhaust assembly to be opened to realize flowing of low-pressure separation gas, so that the control assembly is matched with the hydraulic assembly to drive the sealing plug to switch between pressurization and depressurization in a reciprocating manner, gas-liquid mass transfer is accelerated during pressurization, and more low-pressure separation gas enters a liquid phase to react with a desulfurizing agent; and during pressure reduction, part of gas dissolved in the liquid phase escapes to break original gas-liquid balance and promote more low-pressure gas to enter the liquid phase from the gas phase, so that the mass transfer efficiency is further improved, and the desulfurization reaction is enhanced.

The acid removal system comprises a shift gas washing tower, a medium-pressure flash tower, a CO2 desorption tower, an H2S concentration tower, an N2 gas stripping tower, a thermal regeneration tower, a methanol-water separation tower and a tail gas washing tower which are sequentially communicated through a first pipeline, the lower end of the shift gas washing tower is communicated with a shift gas pipe which is communicated with the top of the medium-pressure flash tower through a second pipeline, and the top of the shift gas washing tower is communicated with a PSA hydrogen production device through a third pipeline; the CO2 desorption tower is sequentially communicated with the compressor and the urea production part through a fourth pipeline; the comprehensive automation level of the acid removal device can be improved, and the operation labor intensity is reduced; the operation stability of the acid removal device is improved, and the standard deviation of each key process parameter is reduced.

The invention belongs to the technical field of methanol hydrogen production, and discloses a process for catalytic heating coupling methanol hydrogen production. The process comprises the following steps: S1, providing a methanol cracking hydrogen production system; and S2, carrying out methanol steam reforming hydrogen production treatment based on a methanol cracking hydrogen production system. And S3, carrying out pressure swing adsorption treatment on the methanol decomposition gas prepared in S2 to obtain desorbed gas and purified hydrogen. S4, purified hydrogen flows through a product gas buffer tank with a filter element and then is fed into a gas using section. And S5, feeding the desorbed gas into a catalytic oxidation reactor for recovery treatment, and supplying released heat energy to a methanol cracking hydrogen production system for use. According to the invention, the organic combination of catalytic oxidation and methanol cracking hydrogen production is realized, the problems that the existing methanol hydrogen production process needs to discharge combustible tail gas and is unsafe and not environment-friendly are solved, extra fuel is not needed in the whole hydrogen production process, and only methanol needs to be provided; the method has the remarkable advantage of zero consumption of natural gas, diesel oil, coal and other fuels.

A sour gas stream is sub-stoichiometrically combusted to produce soot and a sour syngas stream. At least 10% of the carbon in the sour gas stream is converted into the soot. At least a portion of the hydrogen sulfide of the sour syngas stream is reacted with sulfur dioxide to produce a syngas stream comprising the carbon dioxide, the carbon monoxide, the hydrogen, water, elemental sulfur vapor, a residual portion of the hydrogen sulfide, and a residual portion of the sulfur dioxide. The syngas stream is reacted with steam to produce a shifted sour gas stream including more carbon dioxide, more hydrogen, more hydrogen sulfide, and less carbon monoxide in comparison to the syngas stream. Water and hydrogen sulfide is separated from the shifted sour gas stream to produce a sweet gas stream. The sweet gas stream is separated into a hydrogen product stream and an exhaust stream.

To provide a dry water electrolysis hydrogen gas producing apparatus capable of suppressing malfunction of a vacuum pump.SOLUTION: Provided is a dry water electrolysis hydrogen gas producing apparatus including a water electrolysis device that electrolyzes water to generate humid water electrolysis hydrogen gas containing hydrogen and water vapor, an absorber that brings the humid water electrolysis hydrogen gas into contact with an absorbent liquid to obtain a humid absorbent liquid that selectively absorbs the dried water electrolysis hydrogen gas and water vapor with reduced humidity, a first regenerator that brings the humid absorbent liquid into contact with a drying gas for regeneration to obtain a preliminary dried absorbent liquid with reduced moisture content and a humid regeneration gas with increased humidity, a second regenerator that uses a vacuum pump to dehydrate the preliminary dried absorbent liquid under reduced pressure to obtain a dried absorbent liquid, and a liquid transfer pump that sends the dried absorbent liquid to the absorber.SELECTED DRAWING: Figure 1

A reactive distillation system for decomposition of hydriodic acid into hydrogen gas and iodine, with optional secondary purification unit(s) is described. Methods for using the reactive distillation system with optional secondary purification unit(s) for the decomposition of hydriodic acid into hydrogen gas and iodine is also described. When the purification unit is present, the system and methods of the disclosure can be used for the production and purification of hydrogen from hydriodic acid.

Steam reforming processes can include treatment of syngas by water gas shift, water separation, and hydrogen separation by pressure swing adsorption (PSA). Additionally, CO2 can be scrubbed from the syngas prior to the PSA. PSA tail gas, including CH4, CO, and H2, can be recompressed and recycled to the PSA for further hydrogen separation and to the steam reformer feed to convert eventually all carbon in the feedstock into CO2 for the scrubber to separate. Fuel requirements can be fulfilled by part of the hydrogen product to eliminate stack CO2 emissions.

The invention relates to the technical field of oil residue ammonia production tail gas treatment, in particular to an oil residue ammonia production tail gas treatment device and a tail gas treatment method.The oil residue ammonia production tail gas treatment device comprises a base, a large-particle filtering unit is fixedly installed on the upper side of the base, and a heat exchange assembly is fixedly installed on one side of the large-particle filtering unit; a spraying purification assembly is fixedly installed on one side of the heat exchange assembly, a purified gas conveying pipe is fixedly installed on the upper side of the spraying purification assembly, a gas conveying opening of the spraying purification assembly is fixedly connected with the heat exchange assembly, and a hydrogen extraction assembly is fixedly installed at an exhaust opening of the heat exchange assembly; the output end of the driving motor drives the lifting screw rod to rotate, the lifting screw rod drives the sleeve to move, inflated gas is compressed to reach set pressure, gas containing hydrogen is subjected to permeability extraction through the polyimide film, hydrogen in tail gas is extracted, and the purpose that the hydrogen in the tail gas is extracted is achieved. And the problem of resource waste caused by direct emission of hydrogen is avoided.

The invention provides a waste hydrogen power generation device applied to manufacturing equipment of semiconductors and the like, the device can reduce the burden of purifying waste hydrogen, and hydrogen can be applied to power generation again, so that auxiliary power supply to facilities is realized. This waste hydrogen gas power generation device is provided with: a hydrogen gas generation unit such as an epitaxial growth device; a purification unit that recovers the waste hydrogen gas from the hydrogen gas generation unit and removes impurities other than hydrogen gas by contacting with water to prepare purified hydrogen gas; a storage unit for storing the purified hydrogen gas; and a power generation unit for driving a power generator by combusting the purified hydrogen gas supplied by the storage unit with oxygen gas in the atmosphere.

The invention discloses a method and a system for separating low-carbon hydrocarbons. The method comprises the following steps: cooling synthesis gas, introducing the cooled synthesis gas into a low-temperature methanol tower, and carrying out low-temperature methanol washing to separate gas-phase CO and H2 and a liquid-phase low-temperature methanol base solution; the liquid-phase low-temperature methanol base solution enters an evaporation tower to be separated to obtain gas-phase low-carbon hydrocarbons, carbon dioxide and liquid-phase low-temperature methanol; gas-phase low-carbon hydrocarbons and carbon dioxide enter a carbon dioxide absorption tower, carbon dioxide is absorbed by adopting an alcohol amine solution, the gas phase is low-carbon hydrocarbons, and the liquid phase is carbon dioxide-rich absorption liquid. According to the invention, the recovery rates of CO and H2 reach 96.40% and 99.28%, which are far higher than those of the existing PSA technology. Meanwhile, the absorption efficiency of CO2 reaches 99.95%; except that the ethylene absorption efficiency is 0.7357 * 100 which is equal to 73.57%, the absorption efficiency of other low-carbon hydrocarbons (C2, C3 and C4 olefin alkanes) is greater than 99% and even reaches 100%.

The invention provides an effective gas recovery method and device for a low-temperature methanol washing device, and the method comprises the following steps: raw material gas and lean methanol are subjected to desulfurization and decarburization in a shift gas washing tower, qualified purified gas is obtained at the top of the shift gas washing tower, and methanol without hydrogen sulfide is obtained at the middle part of the shift gas washing tower; methanol containing hydrogen sulfide is obtained from a tower kettle of the shift gas washing tower; and the hydrogen sulfide-free methanol and the hydrogen sulfide-containing methanol are respectively subjected to gas stripping operation through high-pressure nitrogen, effective gases of hydrogen and carbon monoxide are recovered, and the obtained recycle gas is returned to the raw material gas. A high-pressure nitrogen gas stripping mode is adopted to replace a medium-pressure flash evaporation mode to recycle effective gas, the concentration of the effective gas in the circulation gas generated in the process is increased by about one time, the pressure of the obtained circulation gas is close to that of raw gas, the compression ratio of a compressor is greatly reduced, and the energy consumption is reduced. By adopting high-pressure nitrogen gas stripping, the flow of circulating gas can be greatly reduced, and the power consumption of the compressor is reduced.

A hydrocarbon stream is combusted within a reactor to produce soot and syngas. Sub-stoichiometric combustion of the hydrocarbon stream within the reactor converts at least 10% of the carbon in the hydrocarbon stream into soot. The syngas is mixed with a steam stream to produce a hydrogenation feed stream. A shift reactor converts at least a portion of the carbon monoxide and steam to carbon dioxide and hydrogen to produce a shifted gas stream. Water is separated from the shifted gas stream to produce a dehydrated gas stream. The dehydrated gas stream is separated to produce a hydrogen product stream and a recycle stream. The recycle stream is recycled to the reactor.

The present application provides an apparatus and method for recovering nitrogen discharged from waste water by washing with liquid nitrogen, comprising: a U-tube circulating water heater, a first pipeline, and a second pipeline. The inlet end of the U-tube circulating water heater is connected to the middle section of the second pipeline through the first pipeline, and the outlet end is used to connect to the fuel gas pipeline network; one end of the second pipeline is connected to the hydrogen separator; a control valve and a shut-off valve are provided on the second pipeline, and the control valve is located between the first pipeline and the hydrogen separator, and the shut-off valve is located between the first pipeline and the end of the second pipeline away from the hydrogen separator. The present invention effectively recovers CO in the discharged nitrogen. Each set of equipment can recover more than 170 NM3 / h of fuel gas and 100 NM3 / h of effective gas, with an annual benefit of more than 640,000 yuan, and a significant energy-saving effect. At the same time, due to the reduction of cold torch discharge, steam consumption is indirectly saved, and the phenomenon of long-term ice accumulation in the buffer tank is completely eliminated, which greatly improves the sanitation around the buffer tank and on the ground.

A process for the production of hydrogen comprises: a first steam reforming step of a feedstock containing hydrocarbons to obtain a first synthesis gas; a first synthesis gas shift and cooling step on the first synthesis gas; a separation step for separating the first synthesis gas into a high concentration hydrogen stream and a tail gas stream; a second low pressure steam reforming step performed on the tail gas to obtain a second synthesis gas; a second synthesis gas shift and cooling step on the second synthesis gas; a CO2 removal step performed on the stream of hydrogen and carbon dioxide exiting the second synthesis gas shift and cooling step in order to separate a CO2 stream from a fuel grade hydrogen stream; a step of feeding at least a part of the fuel grade hydrogen stream to the first steam reforming step.

Provided are a process and a system for treating both a high-pressure (HP) and a low-pressure (LP) acid gas-containing gas streams. The system includes a HP absorber unit, a flash drum coupled downstream of the HP absorber unit, and a LP absorber unit coupled downstream of the flash drum. The process includes introducing a HP rich amine solution from a HP absorber unit into a flash drum, operating the flash drum such that a flashed sour gas and a flash drum rich amine solution are produced, and introducing the flashed sour gas and the LP acid gas-containing gas stream into a LP absorber unit.

A process for producing hydrogen from a syngas stream is provided in which carbon dioxide is removed from the syngas stream by absorption. After carbon dioxide has been desorbed from the absorption medium, the absorption medium present in the resulting carbon dioxide stream is removed by adsorption on the solid adsorbent, for example due to the molecular sieve effect. A portion of the thus obtained carbon dioxide stream now free of the absorbing medium is heated and used to regenerate the loaded solid adsorbent. The invention further provides a device for carrying out the method according to the invention.

The utility model relates to a hydrogen purification device which comprises an impurity removal device, a water removal device and a base, a second breather pipe on the upper right portion of the impurity removal device penetrates through a pipeline notch in the lower left side of the water removal device to enter the water removal device, the impurity removal device and the water removal device are fixed on the base, and a water injection hole is formed in the upper left portion of the impurity removal device. The water removal device is provided with a shell, and the left side of the impurity removal device is provided with a third ventilation pipe, a sulfuric acid injection port and a sulfuric acid outlet from top to bottom. The engine drives the stirring shaft, the stirring blades, the water inlet and the water outlet to cooperate with each other to improve the impurity removal rate, and the first air suction fan and the second air suction fan cooperate with the second breather pipe and the third breather pipe, so that the hydrogen collection rate is improved while the hydrogen collection is more sufficient and thorough. Conditions of concentrated sulfuric acid and the second breather pipe are observed through the visible port, and the situation that water contained in hydrogen is not removed due to the fact that the second breather pipe is not immersed by the concentrated sulfuric acid is prevented.

The present invention relates to a process for treating a stream comprising CO2 and H2, the process comprising (i) preparing a stream comprising CO2 and H2; (ii) treating the stream prepared in (i) with one or more liquid amine-containing streams, obtaining a gaseous H2-containing stream and a liquid CO2-loaded amine-containing stream; (iii) expanding the liquid CO2-loaded amine-containing stream, obtaining one or more gaseous CO2-containing streams and a liquid CO2-reduced amine-containing stream; (iv) optionally dividing the liquid CO2-reduced amine-containing stream into a first liquid CO2-reduced amine-containing stream and a second liquid CO2-reduced amine-containing stream; (v) stripping CO2 from the liquid CO2-reduced amine-containing stream obtained from (iii) or from the first liquid CO2-reduced amine-containing stream obtained from (iv), obtaining a liquid CO2-depleted amine-containing stream and a gaseous CO2-containing stream; (vi) preparing a liquid H2O-containing stream; (vii) transferring heat from the liquid CO2-depleted amine-containing stream to the liquid H2O-containing stream, obtaining a cooled amine-containing stream and a heated H2O-containing stream; (viii) expanding the heated H2O-containing stream, obtaining a gaseous H2O-containing stream and a liquid H2O-containing stream; (ix) recycling at least a part of the liquid H2O-containing stream into the H2O-containing stream prepared in (vi).