214results about "Hydrogen separation by selective and reversible uptake" patented technology

The invention concerns a process and apparatus for cracking ammonia in which heated ammonia at super-atmospheric pressure is partially cracked over a first catalyst in a reaction zone of an electrically heated reactor to produce partially cracked ammonia gas which is then cracked in reactor tubes containing a second catalyst in a fired reactor to produce cracked gas comprising hydrogen gas, nitrogen gas and residual ammonia. The cracked gas is cooled and hydrogen is recovered from the cooled cracked gas in a hydrogen recovery unit. Offgas from the hydrogen recovery unit, or a cracked offgas derived therefrom, provides at least some, preferably all, of the fuel requirement in the fired reactor. Varying the power input to the first part of the cracking reaction enables direct control of the heat flux profile and hence accommodate any excess or shortfall in the heat input from the fired reactor.

The invention belongs to the technical field of hydrogen production, and particularly relates to a double-tank metal hydride hydrogen purification device which comprises a first tank body, a second tank body, a primary exhaust pipe, a gas communicating pipe, a first liquid passing bathroom, a second liquid passing bathroom, a circulating liquid bath chamber and a liquid communicating pipe. A first perforated pipe and a first metal hydride are arranged in the first tank body; and a second perforated pipe and a second metal hydride are arranged in the second tank body. The primary exhaust pipe is communicated with the first perforated pipe, and the gas communication pipe is communicated with the primary exhaust pipe and the second perforated pipe. And the first tank body and the second tank body are coated with the first liquid passing bathroom and the second liquid passing bathroom respectively. And the first liquid passing bathroom, the circulating liquid bath chamber, the second liquid passing bathroom and the liquid communicating pipe are communicated in sequence to form a liquid pipeline. Through the design of the circulating liquid bath chamber and the liquid communicating pipe, the hydrogen absorption and heat release process and the hydrogen desorption and heat absorption process are mutually compensated, the heat utilization efficiency is improved, the external heating and cooling requirements are reduced, and the energy consumption in the hydrogen purification process is reduced.

The invention concerns a process and apparatus for cracking ammonia in which heated ammonia at super-atmospheric pressure is partially cracked in reactor tubes containing a first catalyst in a fired reactor to produce partially cracked ammonia gas which is then cracked over a second catalyst in a reaction zone of an electrically heated reactor to produce cracked gas comprising hydrogen gas, nitrogen gas and residual ammonia. The cracked gas is cooled and hydrogen is recovered from the cooled cracked gas in a hydrogen recovery unit. Offgas from the hydrogen recovery unit, or a cracked offgas derived therefrom, provides at least some, preferably all, of the fuel requirement in the fired reactor. Varying the power input to the second part of the cracking reaction enables direct control of the heat flux profile and hence optimization of the conversion.

The invention relates to the technical field of purification, and discloses a hydrogen purification method based on a magnesium-based solid hydrogen storage material, which comprises the following steps: S11, packaging the magnesium-based solid hydrogen storage material into a plurality of purification units, connecting the two purification units in parallel, and arranging a thermal interaction unit between the two parallel purification units to form a primary purification module; and S2, purification: introducing the low-purity hydrogen into the purification module, so that the low-purity hydrogen is respectively subjected to a hydrogen absorption reaction and a hydrogen desorption reaction for multiple times in the purification units connected in parallel, the low-purity hydrogen is purified, heat is supplied to the purification units which are subjected to the hydrogen desorption reaction through the heat interaction unit, and heat energy released by the hydrogen absorption reaction is stored. Based on the selective adsorption capacity of the solid hydrogen storage material to hydrogen, the solid hydrogen storage material is used for adsorbing hydrogen and discharging impurity gas, so that the purity of hydrogen is improved, and the heat interaction unit is used for storing heat energy released by a hydrogen absorption reaction and applying the heat energy to a hydrogen desorption reaction, so that the energy consumption in the purification process is reduced.

The invention concerns a process and apparatus for cracking ammonia in which heated ammonia at super-atmospheric pressure is partially cracked over a first catalyst in a reaction zone of an electrically heated reactor to produce partially cracked ammonia gas which is then cracked in reactor tubes containing a second catalyst in a fired reactor to produce cracked gas comprising hydrogen gas, nitrogen gas and residual ammonia. The cracked gas is cooled and hydrogen is recovered from the cooled cracked gas in a hydrogen recovery unit. Offgas from the hydrogen recovery unit, or a cracked offgas derived therefrom, provides at least some, preferably all, of the fuel requirement in the fired reactor. Varying the power input to the first part of the cracking reaction enables direct control of the heat flux profile and hence accommodate any excess or shortfall in the heat input from the fired reactor.

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 concerns a process and apparatus for cracking ammonia in which heated ammonia gas at super-atmospheric pressure is partially cracked in at least two adiabatic reactors in series with interstage heating in which the feed temperature to a first reactor is higher than the feed temperature to a further reactor to produce a partially cracked ammonia gas which is then fed to catalyst-containing reactor tubes in a furnace to produce a cracked gas comprising hydrogen gas, nitrogen gas and residual ammonia gas. The use of the adiabatic reactors enables more efficient heat integration within the process and the higher temperature in the first reactor enables the use of a nickel-based catalyst in that reactor as an alternative solution to the potential problem of the presence of oil in the ammonia.

The present invention relates to a method and device for purifying and storing industrial crude hydrogen based on catalytic hydrogenation of gamma-butyrolactone, wherein the purification and storage method comprises: 2 The crude hydrogen is introduced into γ-butyrolactone for catalytic reaction, so that the hydrogen is stored in the molecules of 1,4-butanediol, realizing one-step separation and purification of crude hydrogen and catalytic hydrogen storage. Compared with the prior art, the present invention can realize one-step separation and purification of crude hydrogen and catalytic hydrogen storage, and can avoid CO and CO 2 The reaction temperature of side reactions such as hydrogenation to synthesize methanol is reduced, thereby obtaining high hydrogen storage efficiency and selectivity; when hydrogen is needed, high-purity hydrogen can be removed from 1,4-butanediol by a catalytic method; compared with traditional multi-step crude hydrogen purification methods such as water vapor shift-pressure swing adsorption-chemical absorption, the process reported in the present invention is short, efficient and low-cost.

This application relates to the field of hydrogen production, and specifically discloses a hydrogen production drying and regeneration system, which includes a water electrolyzer, a gas-water separator, a cooler, a drying tower, a hydrogen storage cylinder, and a fuel cell; during the water electrolysis process, the water electrolyzer electrolyzes water to form hydrogen and outputs a mixture containing hydrogen to the gas-water separator. The gas-water separator separates the gas in the mixture and inputs the separated gas into the cooler. The cooler cools the gas from the steam-water separator and outputs a gas containing water vapor and hydrogen to the drying tower. The drying tower absorbs the water vapor and outputs hydrogen to the hydrogen storage cylinder; during the power generation process, the hydrogen storage cylinder outputs hydrogen to the drying tower. The drying tower releases the water vapor absorbed during the water electrolysis process. The water vapor and hydrogen output by the drying tower are input into the fuel cell through the cooler, and the fuel cell generates electricity using the water vapor and hydrogen. The purpose of this application is to provide a hydrogen production drying system with a cyclic regeneration function.

The invention relates to a method (10) for producing hydrogen and / or ammonia, having the following steps: providing a first synthesis gas stream (SG3) comprising hydrogen, carbon monoxide and carbon dioxide; providing a second synthesis gas stream (SG4), which is enriched with hydrogen and carbon dioxide and is depleted of carbon monoxide compared to the first synthesis gas stream (SG3), using the first synthesis gas stream (SG3) or a part thereof; providing a first hydrogen stream (HG1) using hydrogen of the second synthesis gas stream (SG4) and a first pressure swing adsorption unit (204); providing a carbon dioxide stream (CG1) using carbon dioxide of the second synthesis gas stream (SG4) and a carbon dioxide separation unit (205); and processing a first residual gas stream (RG2), or a part thereof, remaining downstream of where the first hydrogen stream (HG1) and the carbon dioxide stream (CG1) are provided in order to obtain a second hydrogen stream (HG2) and a second residual gas stream (RG3). The invention is characterized in that the second residual gas stream (RG3) is returned to a position directly upstream of where the carbon dioxide stream (CG1) is provided.

A process and a plant (100) for production of a process product (15) are proposed, with which it is possible to feed a first reactant stream (11) and a second reactant stream (12) to a reactor (130) and to convert them in the reactor (130) in an exothermic reaction to a crude product (13) containing the process product (15), wherein a chiller system (160, 170) is used to cool (140) the crude product (13) with at least partial condensation or to store (150) the process product (15) that has been formed using at least a portion of the condensed crude product (14) at temperatures below 0°C. A characteristic feature here is that the first (11) and / or second (12) reactant stream is subjected to preliminary cooling (210, 120) using the chiller system (170).

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.

The present invention discloses a method and a system for producing hydrogen by a biomass combined process. The method first pre-treats biomass raw materials and then enters a carbonization reactor for carbonization. The solid product obtained by carbonization further enters a gasification reactor for gasification reaction. The gas-phase material obtained by the gasification reaction is subjected to a water-gas shift reaction and pressure swing adsorption treatment to obtain a hydrogen product. The present invention converts biomass into a high-value-added hydrogen product through a carbonization-gasification-purification and purification combined process, and has the advantages of simple process, high hydrogen production rate and purity, and high energy utilization rate.

The present application relates to a process for producing synthetic ammonia by using hydrogen-containing tail gas, comprising the following steps: S1: sodium cyanide tail gas is pressurized, then heated and water-cooled. S2: the impurity-removed tail gas is desulfurized. S3: the desulfurized tail gas is mixed with chlor-alkali tail gas, the mixed gas is heated and deoxidized. S4: the deoxidized tail gas is pressurized and enters a PSA (pressure swing adsorption) device for pressure swing adsorption treatment, obtaining high-purity hydrogen. In the PSA device, dehydrating, carbon dioxide, methane, carbon monoxide and nitrogen adsorbents are sequentially arranged. The carbon dioxide adsorbent is activated carbon modified by carbonate and strong alkali, and the nitrogen adsorbent is 13X zeolite molecular sieve modified by Na + and Ba 2+ and Ca 2+ ion exchange. S5: nitrogen reacts with the high-purity hydrogen obtained in step S4 to generate ammonia. The present application can improve the adsorption capacity of the adsorbent for impurity gas, thereby reducing the replacement frequency of the adsorbent, prolonging the service period and service life of the adsorbent, and improving the production efficiency.

The invention relates to a method (100, 200) for producing a hydrogen product (15), wherein a first pressure swing adsorption process (108) for separating hydrogen is followed by a carbon dioxide removal process (110) for removing carbon dioxide, and a remaining tail gas (19) is processed by means of a further pressure swing adsorption process (120). Hydrogen separated in the further pressure swing adsorption process (120) is used as required. The invention also relates to a corresponding plant.

A method for producing a plurality of product gas streams by a pressure swing adsorption (PSA) unit is described. The method comprises: receiving first feed gas stream 12 having a first pressure; receiving a second feed gas stream 14 having a second pressure that is lower than the first pressure; producing at least a first product stream 16, a second product stream 20, and a third product stream 18 without compressing the second feed gas stream to a pressure level corresponding to the first pressure. The first feed gas stream 12 may comprise non- adsorbed components such as hydrogen and helium; least adsorbable components such as water and hydrocarbons heavier than methane; less adsorbable components such as carbon monoxide and methane; and heavily adsorbable components such as carbon dioxide. The second feed gas stream 14 may comprise non-adsorbed and least adsorbable components.

The present invention relates to a process for the production of hydrogen, comprising steps of hydrodesulfurization, reforming in a reforming section comprising a gas-heated reformer and an autothermal reformer, a water-gas shift step, a carbon dioxide separation step, and a hydrogen purification step. The hydropurification step produces a hydrocarbon-containing stream that is split, one portion of which is used as a fuel gas stream supplied to one or more combustion heaters used to heat one or more process streams in the process, and the other portion of which is split into a hydrodesulfurization recycle stream that is compressed and used in a hydrodesulfurization unit, and a process recycle stream that is returned to the process. The present invention also relates to a chemical plant configured to carry out the process.

The present invention discloses a hydrogen purification device with diversion, impurity removal and anti-blocking, comprising a main pipeline, wherein the end of the main pipeline is connected to a diversion pipe for diverting the gas, and the two ends of the diversion pipe are respectively connected to a first filter box and a second filter box, and the two ends of the first filter box and the second filter box are each connected to a branch pipe for transporting the hydrogen after impurities are removed. The hydrogen purification device with graded impurity removal allows the impurities and gases that are not easily cleaned by the forward nozzle in the adsorbent bed group to converge to the middle position of the blocked filter box, and the servo motor of the pushing structure is restarted and reversed, and the blocking conditions of the two filter boxes are swapped. During the movement of the push plate, the impurity gas that was previously blocked and backwashed is pushed to the automatic exhaust structure, thereby discharging the device, avoiding long-term use, impurities and miscellaneous gases causing blockage, resulting in poor filtering effect.

The application relates to a hydrogen recovery and recycling system and a hydrogen recovery and recycling method, which comprise a hydrogen production component, a hydrogen utilization component, a recovery component and a control component. The hydrogen production component is used for producing hydrogen. The hydrogen utilization component is used for utilizing hydrogen. The hydrogen utilization component is connected with the hydrogen production component. The recovery component is used for recovering hydrogen. The recovery component is connected with the hydrogen production component. The control component is used for controlling the on-off between the hydrogen utilization component and the recovery component. The control component is connected with the hydrogen utilization component and the recovery component respectively. The hydrogen recovery and recycling system and the hydrogen recovery and recycling method provided by the application can reduce hydrogen energy waste, realize cyclic use of hydrogen energy, reduce waste gas emission, reduce production cost and improve product quality.

The present disclosure provides systems and methods for hydrogen production as well as apparatuses useful in such systems and methods. Hydrogen is produced by steam reforming of a hydrocarbon in a gas heated reformer that is heated using one or more streams comprising combustion products of a fuel in an oxidant, preferably in the presence of a carbon dioxide circulating stream.

The invention is applicable to the technical field of equipment control, and provides a hydrogen purification method based on big data analysis and electronic equipment, and the hydrogen purification method comprises the following steps: acquiring real-time acquisition data of raw material gas in a hydrogen production cavity; the real-time acquisition data comprises first component information and flow data of the feed gas; performing data analysis on the real-time acquired data through a preset supervision model to obtain a valve control script corresponding to the hydrogen production cavity; controlling each valve to switch according to the valve switching time sequence so as to adsorb impurities in the raw material gas through an adsorber corresponding to each valve; and collecting the raw material gas adsorbed by all the valves to obtain target hydrogen with preset purity. By adopting the method, the adsorption effect of the adsorber corresponding to each valve can be improved, so that the purity of hydrogen in finished gas is improved, the accuracy of hydrogen production management can also be improved, repeated impurity adsorption is not needed, and the production efficiency of hydrogen is improved.

A system can include a reforming reactor, a water-gas shift (WGS) reactor, a sub-system to increase the partial pressure of carbon monoxide and carbon dioxide, and a sorption enhanced water-gas shift (SEWGS) reactor. The reforming reactor may react a hydrocarbon feed to produce a reformer effluent that includes carbon monoxide and hydrogen. The WGS reactor may receive the reformer effluent and to convert at least a portion of the carbon monoxide to carbon dioxide and hydrogen and produce a shift effluent. The sub-system may increase the partial pressure of carbon monoxide and carbon dioxide in the shift effluent. The SEWGS reactor may receive the shift effluent with the increased partial pressure of carbon monoxide and carbon dioxide and to provide a carbon-dioxide-rich product stream and a hydrogen-rich product stream.

The present invention relates to the field of hydrogen energy processing technology, and discloses an activated carbon adsorption hydrogen storage tank and activated carbon degassing equipment, including a hydrogen storage tank, a purification box is fixedly connected to the interior of the hydrogen storage tank, a pump body is fixedly installed on the top of the purification box, a pipeline 1 is fixedly connected to the interior of the pump body, a mounting assembly is fixedly connected to the interior of the purification box, an activated carbon purification device is movably installed inside the mounting assembly, and activated carbon is arranged inside the activated carbon purification device. The present invention has the following advantages and effects: hot gas enters the interior of the heat exchange box for circulation, so as to achieve the effect of heating the hydrogen inside the pipeline 2, thereby increasing the thermal conductivity inside the hydrogen storage tank and the gas desorption effect when the device degasses the hydrogen, and the hydrogen enters the interior of the activated carbon purification device through the pipeline 1, so that the hydrogen storage tank is fully in contact with the activated carbon inside the activated carbon purification device during the degassing process, thereby improving the exhaust quality.

The invention provides a hydrogen adsorption and storage composite material for a high-hygrothermal environment of a coal mine as well as a preparation method and application of the hydrogen adsorption and storage composite material, and relates to a high-efficiency hydrogen adsorption and storage composite material. The method comprises the following steps: activating activated carbon to obtain pretreated activated carbon; the method comprises the following steps: soaking zeolite in a NaCl solution, and drying to obtain pretreated zeolite; mixing ZIF-8, the pretreated activated carbon and zeolite, and adding the mixture into a ball mill for ball milling to obtain composite powder; mixing and stirring the obtained composite powder and a binder, curing into a sphere by adopting a spray drying method, and drying and heating to form a porous structure, thereby obtaining the hydrogen adsorption and storage composite material for the high-humidity-heat environment of the coal mine. According to the MOFs composite material disclosed by the invention, efficient separation and storage of hydrogen in a complex gas source are realized by utilizing a hierarchical pore structure and moisture-resistant stability of the material, relatively high hydrogen adsorption capacity and relatively high adsorption rate can be kept in a high-humidity-heat environment, and the MOFs composite material is suitable for high-risk environments such as a coal mine and the like.

The application provides an underground gasification and electrolysis water coupling zero-carbon hydrogen production system and a resource comprehensive utilization method, which can effectively reduce the production cost of electrolytic hydrogen production, make full use of oxygen generated by electrolysis while providing suitable water sources, and make hydrogen energy more widely and practically applied; carbon monoxide produced by underground coal gasification and separated and purified is used as a circulating medium in the process of electrolytic hydrogen production, which can reduce a part of hydrogen production power consumption, and carbon dioxide and oxygen generated by the anode of the electrolytic cell can be used as a gasification agent in the gasification process or a combustion-supporting agent in the power generation process, and the carbon dioxide produced by the power generation device can also be injected into the underground gasification furnace as a gasification agent; while reducing the cost of high-purity gasification agent preparation and transportation, the condensate water of the synthesis gas after treatment can be reasonably utilized, and then the underground coal gasification technology and the existing electrolytic water hydrogen production process are combined to create a new zero-carbon hydrogen production system with a fusion of technical systems and efficient utilization of resources.

The disclosure relates to systems and methods to produce hydrogen (H2) gas from hydrogen sulfide (H2S). H2S is contacted with a catalyst to form H2 gas and sulfur adsorbed to the catalyst. The adsorbed sulfur is contacted with oxygen (O2) gas to convert the adsorbed sulfur to sulfur dioxide (SO2) and regenerate the catalyst.

A method and a system for carbon neutral power generation integrating generating power by means of a gas turbine using hydrogen as fuel. Hydrogen is produced by a modular natural gas steam reforming unit. Carbon capture and heat recovery from the turbine exhaust gases to heat the natural gas and the steam fed to the steam reforming step are also provided.

The invention relates to a method of providing a synthesis gas for production of ammonia, wherein desulfurized natural gas is converted with steam and oxygen-enriched air or with oxygen in a reforming step to form a synthesis gas comprising hydrogen, CO and CO2, wherein CO2 is separated from the synthesis gas in a separation step, wherein a hydrogen stream and a hydrogen-rich offgas stream are formed in a pressure swing adsorption (7), the pressure swing adsorption being operated in an adsorption cycle for providing the hydrogen stream and in a regeneration cycle for providing the hydrogen-rich offgas stream, wherein nitrogen is added to the synthesis gas in an enrichment step. In a method of producing a synthesis gas for production of ammonia in which the CO2 output can be reduced, the duration of the regeneration cycle of the pressure swing adsorption (7) is adjusted such that the hydrogen content of the offgas stream is adjusted, preferably increased, and the offgas stream is at least partly provided as fuel gas for a method step of the method.

A process (100) for producing a process product (15) is proposed, in which a first reactant stream (11) and a second reactant stream (12) are fed to a reactor (130) and converted in the reactor (130) in an exothermic reaction to form a crude product (13) containing the process product (15), wherein the crude product (13) is subjected to cooling (140) against a refrigerant (141, 142) with at least partial condensation, and wherein the process product (15) is formed using the at least partially condensed crude product (14). It is provided that the first (11) and / or the second (12) reactant stream is formed using precooling (120) against the refrigerant (141, 142) used for cooling (140) the crude product (13) and / or the at least partially condensed crude product (14). A corresponding facility is also proposed.

The present invention relates to the technical field of purification, and discloses a hydrogen purification system, which comprises a primary purification module, the primary purification module comprises a first purification unit, a second purification unit and a thermal interaction unit, and the first purification unit and the second purification unit are arranged in parallel and alternately perform a hydrogen absorption reaction and a hydrogen desorption reaction, the thermal interaction unit is arranged between the first purification unit and the second purification unit, and heat energy released by the first purification unit or the second purification unit which performs hydrogen absorption reaction can be transferred to the second purification unit or the first purification unit which performs hydrogen desorption reaction through the thermal interaction unit. According to the scheme, based on the selective adsorption capacity of the magnesium-based solid hydrogen storage material to hydrogen, the magnesium-based solid hydrogen storage material is used for adsorbing the hydrogen and discharging impurity gas, so that the purity of the hydrogen is improved and can reach 99.9999% at most, meanwhile, heat energy released by hydrogen absorption reaction is stored by the heat interaction unit and is used for hydrogen desorption reaction, and the hydrogen desorption efficiency is improved. The energy consumption in the purification process is reduced.