193 results about "Cryo-adsorption" patented technology

The invention relates to the technical field of low-temperature adsorption and isotope separation, in particular to a low-temperature helium isotope adsorption separation system and a low-temperature helium isotope adsorption separation method, and the system comprises a gas distribution and gas recovery module which is used for preparing and mixing helium isotope raw material gas and recovering residual gas after an experiment; the static testing unit is used for testing the performance of the adsorbent under a fixed condition; the dynamic low-temperature adsorption unit is used for helium isotope separation under a continuous flow condition; the low-temperature control module is used for providing a stable low-temperature environment and accurate temperature control; wherein an air inlet pipe and an air outlet pipe of the low-temperature control module are respectively subjected to thermal sedimentation and are respectively connected with a flow controller. According to the scheme, the defects that in the prior art, He resources are seriously short, and existing low-temperature adsorption separation helium isotope examples are few are overcome, reference is provided for low-temperature adsorption separation helium isotope adsorbent screening and system design, development of the He separation and purification technology in China is promoted, and dependence on imported He is reduced.

Provided is a low-temperature adsorption system for flue gas, comprising a spray tower (1) and an adsorption tower (2) which are connected to each other, wherein the spray tower (1) has multiple-stage spray chambers, a spray assembly is correspondingly provided in each spray chamber and is configured to spray a spray liquid so as to cool down flue gas in the spray chamber, and the flue gas is cooled to below room temperature in the spray tower (1), and is then conveyed to the adsorption tower (2), thereby avoiding the problem that a conveying pipeline is blocked because moisture in the flue gas condenses into ice. The adsorption tower has an adsorption chamber (204) and a heat exchange chamber (202), an adsorbent (2042) is provided in the adsorption chamber (204), and the heat exchange chamber (202) is configured to continuously introduce a cooling liquid so as to indirectly cool both the flue gas and the adsorbent (2042), such that adsorption and purification of the flue gas are performed in a subzero-temperature zone, and the cooling liquid after heat exchange is supplied to any one-stage spray assembly as the spray liquid sprayed by the spray assembly.

The invention relates to the technical field of adsorption purification and discloses a regeneration tower and a low-temperature adsorption regeneration system.The regeneration tower comprises a tower body and a plurality of material distribution pipes, and the tower body is provided with an adsorbent inlet and an adsorbent outlet; an inner cavity of the tower body comprises a material distribution cavity which is positioned at the top of the inner cavity and is communicated with the adsorbent inlet, a blanking cavity which is positioned at the bottom of the inner cavity and is communicated with the adsorbent outlet, and a regeneration cavity which is positioned between the material distribution cavity and the blanking cavity, and the material distribution pipe is provided with a feeding end and a discharging end; and the discharge ends of the plurality of material distribution pipes extend into the material distribution cavity from the adsorbent inlet and are separated from one another. According to the regeneration cavity disclosed by the embodiment of the invention, the discharge ends of the plurality of material distribution pipes extend into the material distribution cavity at intervals, so that the adsorbent can be prevented from being accumulated at a local position of the material distribution cavity, the blockage caused by the accumulation of the adsorbent at the local position is avoided, the discharging speed of the adsorbent is improved, and the regeneration efficiency of the adsorbent is further improved.

The utility model discloses a low-temperature adsorption pump and a low-temperature adsorption array suitable for a fusion reactor. The low-temperature adsorption pump comprises a heat shielding baffle, a supercritical helium pipeline, a helium low-temperature plate, an adsorption bin, a high heat conduction plate and a gas baffle, the supercritical helium pipeline, the helium low-temperature plate, the adsorption bin, the high-thermal-conductivity plate and the gas baffle are sequentially arranged in the thermal baffle; and the adsorption bin is filled with an adsorbent. The adsorbent contained in the adsorption bin is multiple times that of a low-temperature adsorption plate with the same area, and particularly, the difference is larger when a low-temperature adsorption array is formed. Meanwhile, a single-stage heat shielding baffle can be used, enough high conductance is guaranteed, high pumping speed and large capacity can be achieved, the problem that activated carbon falls off in the operation process of the low-temperature adsorption pump is effectively solved, and the low-temperature adsorption pump can be used in the strong neutron irradiation environment such as a fusion device in the future.

The invention discloses a low-temperature flue gas conveying system and a low-temperature adsorption system.The low-temperature flue gas conveying system comprises a flue gas inlet pipe and a stopping piece, the flue gas inlet pipe is provided with a flue gas inlet and a plurality of flue gas feeding openings, the stopping piece is located in the flue gas inlet pipe and connected with the inner wall face of the flue gas inlet pipe, and the stopping piece is arranged at the position, close to at least one flue gas feeding opening of the flue gas feeding openings, of the flue gas feeding openings; a gap is formed between at least part of the stopping piece and the smoke feeding opening, and the stopping piece is used for shunting so that part of airflow in the smoke inlet pipe can enter the smoke feeding opening through the gap, and the other part of airflow flows to the downstream smoke feeding opening. According to the low-temperature flue gas conveying system provided by the invention, the stop piece is arranged at the flue gas conveying opening close to the flue gas inlet of the flue gas inlet pipe, and the stop piece is used for shunting the gas flow in the flue gas inlet pipe, so that the flue gas flow velocity at the flue gas conveying opening at the relative upstream is reduced to a certain extent, and the low-temperature flue gas flow velocity at each flue gas conveying opening is balanced; and further, the uniformity of airflow distribution in each low-temperature flue gas treatment bin is optimized.

The invention relates to the technical field of nuclear reactors, and discloses a high-temperature gas cooled reactor helium purification monitoring system and a start-stop and helium purification regeneration judgment method. The high-temperature gas cooled reactor helium purification monitoring system comprises a humidity monitoring module arranged in a high-temperature gas cooled reactor; the first monitoring module is arranged between the dust filter and the copper oxide bed and consists of a first moisture concentration monitoring unit, a first gas tritium concentration monitoring unit and a first liquid tritium concentration monitoring unit; the second monitoring module is arranged between the copper oxide bed and the molecular sieve bed and consists of a second moisture concentration monitoring unit, a second gas tritium concentration monitoring unit and a second liquid tritium concentration monitoring unit; and the third monitoring module is arranged between the molecular sieve bed and the low-temperature adsorber and consists of a third moisture concentration monitoring unit, a third gas tritium concentration monitoring unit and a third liquid tritium concentration monitoring unit. By monitoring the humidity of the high-temperature gas cooled reactor and parameters of all links of the helium purification system, a basis is provided for determining the helium purification regeneration period, and impurities are prevented from exceeding the standard or being excessively regenerated.

The invention relates to a green ammonia synthesis method and system taking renewable energy as power. The method comprises the following steps: S1, providing high-temperature reaction gas; s2, raw material gas is heated through at least part of the high-temperature reaction gas, and heated raw material gas and first cooled mixed gas are obtained; s3, carrying out heating treatment on the adsorbent adsorbing the ammonia gas through the first cooling mixed gas to desorb the ammonia gas, so as to obtain desorbed gas containing the ammonia gas; s4, the desorption gas is subjected to cooling treatment and flash evaporation treatment, and liquid ammonia and first flash evaporation gas are obtained; and S5, carrying out ammonia gas adsorption on the first flash steam through the adsorbent. According to the green ammonia synthesis method taking the renewable energy source as the power, the generated ammonia gas is subjected to low-temperature adsorption and high-temperature desorption, so that efficient recovery of ammonia can be realized; and the energy utilization of the system is reasonable, the energy consumption is reduced, the operation difficulty of device operation is simplified, and the device is more suitable for application in green ammonia scenes.

The invention relates to a coarse helium purification and liquefaction circulation system and method based on low-temperature rectification, and relates to the technical field of low-temperature refrigeration and the technical field of chemical separation. The system comprises a crude helium liquefying unit, a pure helium circulating liquefying unit and a cooling capacity providing unit. The crude helium liquefying unit comprises a crude helium pipeline, a 77K low-temperature adsorber, a multi-stage turbo expander, a multi-stage heat exchanger, a gas-liquid separator, a 20K adsorber, a throttle valve and a liquid helium tank, and is used for liquefying and purifying crude helium; the pure helium circulating liquefaction unit comprises a pure helium pipeline, a multi-stage turbo expander, a reflux compressor, a throttle valve and the like, and is used for liquefying refluxed pure helium; the heat exchange unit comprises a liquid nitrogen pipeline, a backflow pipeline, a multi-stage heat exchanger and the like and is used for providing cooling capacity. By adopting the technical scheme of purifying and liquefying the crude helium and refluxing and liquefying the pure helium, the crude helium extracted from the natural gas through low-temperature condensation can be purified and then liquefied, the energy consumption is low, the operation temperature is flexible, the recovery rate is high, and the low-temperature rectified crude helium can be directly treated.

The invention provides a crude helium storage and recycling system for a cryogenic helium extraction process and a recycling control method, and relates to the technical field of helium production. The crude helium storage and recycling system for the cryogenic helium extraction process comprises a membrane separation device, a permeable gas supercharging device, a pressure swing adsorption device, a low-temperature adsorption device, a first storage tank group, an unloading device, a second storage tank group, a first detection unit, a second detection unit, a first recycling loop, a second recycling loop, a third recycling loop and a control device. According to the technical scheme, the first detection unit is arranged to monitor the concentration of methane and carbon dioxide in the crude helium at the outlet of the pressure swing adsorption device, high-concentration impurities can be effectively prevented from entering the low-temperature adsorption device, the problem of equipment freezing and blocking caused by condensation is avoided, the crude helium recycling path is dynamically adjusted, and the recycling efficiency of the crude helium is improved. And the gas meeting the standard is sent to the next stage for treatment, so that the helium quality and the production efficiency can be improved in the cryogenic helium extraction process.

The invention belongs to the technical field of helium extraction, and particularly relates to a method for extracting high-purity helium from BOG (Boil Off Gas), which comprises the following steps: separating methane and nitrogen in BOG gas through a low-temperature crude extraction process to obtain crude helium; oxygen is added into the crude helium, then heating is performed, hydrogen and a small amount of methane in the crude helium react with the oxygen respectively under the action of a catalyst, the reacted gas is dried and adsorbed, and dehydrogenated crude helium is obtained; carrying out a low-temperature condensation process on the dehydrogenated crude helium to liquefy and remove nitrogen and a small amount of oxygen in the dehydrogenated crude helium to obtain refined helium; nitrogen and oxygen are removed from the refined helium through a low-temperature adsorption process to obtain high-purity helium, liquid nitrogen is adopted as a cold source in the low-temperature adsorption process, and when the liquid nitrogen is vaporized, the vaporized nitrogen is discharged through vacuumizing treatment. The pressure in the liquid nitrogen storage tank is smaller than 1 KPa, the vaporization rate of the liquid nitrogen is higher, more heat is absorbed, the adsorption efficiency of the second adsorber is improved, and consumption of the liquid nitrogen is reduced.

The invention relates to an argon recovery and purification method and device, and the purification method comprises the following steps: filtering out solid particles from crude argon recovered by a workbench; moisture, carbon monoxide and carbon dioxide are removed from compressed crude argon; after purification and cooling, nitrogen, oxygen and impurities are removed to obtain high-purity argon, and the high-purity argon is reheated and enters a production line; the purification device comprises a recovery vacuum pump, a crude argon filter, a recovery buffer, a recovery compressor, an outer low-temperature adsorber, a low-temperature cold box, a main heat exchanger and an inner low-temperature adsorber. According to the invention, after crude argon is filtered and compressed to a pressure slightly higher than the pressure required by an argon using process, impurities are removed through two-step adsorption and catalytic reaction of the outer low-temperature adsorber and the inner low-temperature adsorber in the low-temperature cold box, and then purified high-purity argon is introduced into a production line through reheating of the main heat exchanger; the whole technological process has no throttling and pressure reducing technological requirements, and the pressure difference between the product argon and the exhaust pressure of the compressor is small, so that the energy loss and the production cost are effectively reduced.

The invention relates to the technical field of helium extraction, in particular to a high-purity helium extraction method based on low-temperature adsorption. The method comprises the following steps: in a low-temperature environment, carrying out adsorption treatment on mixed gas by utilizing a low-temperature adsorption material through a dynamic adsorption scheduling optimization algorithm to obtain unadsorbed helium and the low-temperature adsorption material after adsorbing impurity gas; carrying out desorption treatment on the low-temperature adsorption material after adsorbing the impurity gas to obtain desorbed enriched helium; and carrying out low-temperature fractionation treatment on desorbed and enriched helium and unadsorbed helium to obtain high-purity helium. The technical problems that a traditional helium extraction method is low in helium extraction efficiency, purity and recovery rate are solved.

This invention discloses a system and method for extracting helium from natural gas. The system includes an air expander, a cooler, a cold box, and a helium purification system. The cold box includes a main heat exchanger, an air-liquid separator, and an LNG-liquid separator. The helium purification system includes an oxygen-addition and hydrogen-removal reactor, a helium purification system cooler, a helium purifier, a circulating compressor, a booster compressor, and a Dewar flask. The Dewar flask contains a heat exchanger, a gas-liquid separator, and an adsorber. This invention features a reasonable process design, simple equipment, and easy operation, achieving a helium extraction rate of up to 98%. By delivering methane to users in the form of LNG and using low-temperature adsorption to produce pure helium, the economic value of the product is improved.

This invention provides an integrated device and method for gas ultrapurification, comprising: an integrated sealed cavity; an adsorption system disposed inside the integrated sealed cavity, the adsorption system being filled with at least one adsorbent; a temperature control system disposed inside the integrated sealed cavity, including independent refrigerant circulation loops and hot medium circulation loops, for temperature control of the adsorption system; and a gas pipeline system including a raw material inlet, a displacement gas inlet, a product gas outlet, and a desorption gas outlet, each interface being connected to the integrated sealed cavity; the temperature control system controls the temperature of the adsorption system, enabling the sequential execution of a series of processes within the integrated gas ultrapurification device under the condition of an inert gas flow: preheating and activation of the adsorbent, low-temperature adsorption purification of the gas, high-temperature desorption regeneration, and cooling of the adsorbent for later use. The method of this invention is simple, easy to operate, and has broad industrial application prospects.

A cooling and low-temperature adsorption combined purification device, comprising a tower body (11), the tower body (11) having a gas intake port (101) and a gas discharge port (102). A gas intake chamber (103), a gas passage chamber (104), and an adsorption chamber (105), which are sequentially distributed in the radial direction of the tower body (11) from inside to outside, are provided in the tower body (11). The gas intake chamber (103) is in communication with the gas intake port (101), a cooling assembly for cooling a flue gas is provided in the gas intake chamber (103), an adsorbent is provided in the adsorption chamber (105) for adsorbing and purifying the cooled flue gas into a clean flue gas in a sub-zero temperature zone, and the gas discharge port (102) is configured to discharge the clean flue gas. The gas passage chamber (104) has a cross-sectional area gradually decreasing in the direction from top to bottom.

The invention relates to a hydrocarbon adsorption material in a cold start stage of a diesel vehicle and a preparation method and application of the hydrocarbon adsorption material in the technical field of environmental catalysis and tail gas purification, the adsorption material comprises an active component and a carrier material, the active component is Ag, the carrier material is ZSM-5 zeolite with an MFI topological structure, and the mass fraction of the active component Ag is 2.0 wt%. The carrier ZSM-5 is loaded with Ag species through a two-step ion exchange method, ammonium salt pretreatment and silver ion exchange are included, and after centrifugation, drying and air atmosphere calcination, the high-performance material for hydrocarbon adsorption in the cold start stage of the diesel vehicle is finally prepared. The prepared adsorption material has the advantages of being high in silver species dispersity, large in low-temperature adsorption capacity and good in matching of a high-temperature desorption window and DOC activation temperature, compared with traditional silver modified zeolite, the adsorption capacity is increased by 125.7% and 79.6% respectively, desorption peaks are concentrated and matched in temperature, the HCs rejection rate in the cold start-up stage is larger than or equal to 90%, and the adsorption material has the remarkable application value and is suitable for popularization and application. And upgrading and optimization of a diesel vehicle tail gas purification technology can be promoted.

The invention provides a smoke pollutant near-zero-emission full-dry-method treatment system based on ultra-clean electric precipitation. The smoke pollutant near-zero-emission full-dry-method treatment system is composed of a smoke system, an activated carbon system and a desulfurization byproduct preparation system. The flue gas system comprises a flue system, an ultra-clean electric precipitation system, a heat exchange system and a nitrogen oxide circulating system; the activated carbon system comprises a desulfurization and denitrification system, an activated carbon desorption and regeneration system and an activated carbon transportation system. The flue gas is subjected to dust removal, desulfurization, denitration and other processes, so that near-zero emission of pollutants is achieved, and no secondary pollution is generated after the whole flue gas treatment process is finished; the desorbed desulfurization by-product can be prepared into commercial salt or sulfuric acid for sale according to requirements, and the desorbed nitric oxide returns to the hearth to inhibit the generation of new nitric oxide. The system integrates various flue gas pollutant treatment technologies such as ultra-clean electric precipitation, activated carbon low-temperature adsorption desulfurization and denitrification, activated carbon desorption regeneration and nitrogen oxide furnace returning, the flue gas pollutant treatment efficiency is improved, meanwhile, secondary pollutants are thoroughly eliminated, and full-dry-method near-zero emission of flue gas pollutants is achieved.

A low-temperature adsorption and regeneration system, comprising an adsorption tower, a regeneration tower and a regenerated-enriched-gas treatment device (100), wherein the adsorption tower is provided with a flue gas inlet and a clean-flue-gas outlet, and the adsorption tower is internally provided with an adsorbent, which is used for adsorbing flue gas at low temperature and purifying same into low-temperature clean flue gas; the regeneration tower is used for performing regeneration desorption on the adsorption-saturated adsorbent in the adsorption tower, and the regeneration tower is provided with a regenerated-enriched-gas outlet for discharging regenerated enriched gas; and the regenerated-enriched-gas treatment device (100) is in communication with the regenerated-enriched-gas outlet of the regeneration tower and is used for separating water vapor from solid particles in the regenerated enriched gas.

A flue gas cooling and adsorption combined purification tower, comprising a purification tower body (11), the purification tower body (11) having a flue gas inlet (101) and a flue gas outlet (102), and the purification tower body (11) having a cooling chamber (103), an adsorption chamber (104), a flue gas discharge chamber (105) and a transition chamber (106) therein, wherein in the radial direction of the purification tower body (11), the flue gas discharge chamber (105) surrounds the adsorption chamber (104), the adsorption chamber (104) surrounds the transition chamber (106), and the transition chamber (106) surrounds the cooling chamber (103); the cooling chamber (103) is in communication with the flue gas inlet (101), and a cooling device is provided in the cooling chamber (103) and is configured to cool a flue gas to be purified, which is supplied from the flue gas inlet (101) into the cooling chamber (103), to a low-temperature flue gas with a sub-zero temperature; an adsorbent is provided in the adsorption chamber (104) for purifying, by means of low-temperature adsorption, the cooled low-temperature flue gas, which enters the adsorption chamber (104) from the cooling chamber (103), into a clean flue gas; the flue gas discharge chamber (105) is in communication with the flue gas outlet (102), so as to discharge the clean flue gas, which enters the flue gas discharge chamber (105) from the adsorption chamber (104), through the flue gas outlet (102); and the transition chamber (106) is located between the cooling chamber (103) and the adsorption chamber (104), allowing the low-temperature flue gas to enter the transition chamber (106) from the cooling chamber (103) through an inlet of the transition chamber (106), and then enter the adsorption chamber (104) from the transition chamber (106), and the inlet of the transition chamber (106) is away from the flue gas inlet (101) in the axial direction of the purification tower body (11).

The invention discloses a system and a method for purifying helium from multi-component mixed gas containing helium, and belongs to the technical field of gas purification. The system comprises a low-temperature cooling unit, a low-temperature adsorption unit and a helium product storage tank which are communicated in sequence, the low-temperature cooling unit comprises a feeding system, a low-temperature Dewar flask I and a gas-liquid separator; the gas-liquid separator is arranged in the low-temperature Dewar flask I; the low-temperature adsorption unit comprises a low-temperature Dewar flask II and an adsorption column; the adsorption column is arranged in the low-temperature Dewar flask II; multi-component mixed gas containing helium enters the gas-liquid separator through the feeding system to be separated, separated coarse helium enters the adsorption column through a pipeline, and a helium product adsorbed and separated by the adsorption column enters the helium product storage tank. The purification method adopting the system is simple and efficient, and does not need a catalytic dehydrogenation process. High-purity helium or ultra-pure helium with the purity larger than 99.999% can be obtained through one-time low-temperature condensation separation and one-time low-temperature adsorption separation.

The invention relates to the technical field of boilers and discloses a low-temperature adsorption regeneration system capable of achieving deep peak shaving, the low-temperature adsorption regeneration system comprises a boiler, an oxygen conveying pipe, an adsorption tower, a regeneration tower and a nitrogen making machine, the boiler comprises a boiler body and a flue, the oxygen conveying pipe is arranged on the boiler body, and the outlet end of the oxygen conveying pipe extends into a hearth; the adsorption tower is provided with a flue gas inlet and a clean flue gas outlet, an adsorbent is arranged in the adsorption tower, the nitrogen outlet is communicated with the nitrogen inlet of the regeneration tower, and the oxygen outlet is communicated with an inlet of the oxygen conveying pipe. When the boiler operates in a low-load state, high-concentration oxygen introduced into the boiler through the oxygen conveying pipe plays a role in supporting combustion of pulverized coal, the phenomenon that the boiler flames out due to the poor stable combustion capacity of the pulverized coal in the low-load state is avoided, the boiler can operate under the rated load of 40% or even 30%, and the service life of the boiler is prolonged. And therefore, the boiler has a large adjusting space on the valley peak, and the deep peak regulation capacity is high.

The embodiment of the invention provides a method for deeply removing and purifying halide in flue gas. The method for deeply removing and purifying the halide in the flue gas comprises the following steps: step 1, carrying out dust removal and cooling treatment on the flue gas containing the halide to obtain flue gas A; step 2, feeding the obtained flue gas A into a multi-stage stepped cooling spray tower for cooling treatment to obtain low-temperature flue gas C with the temperature of minus zero; 3, the low-temperature flue gas C is fed into a low-temperature adsorption tower for adsorption treatment, and regenerated gas C containing nitrogen and sulfur is obtained after purification and regeneration. Therefore, the method for deeply removing and purifying the halide in the flue gas has the advantages that the energy consumption is reduced, the adsorption efficiency of the halide in the flue gas is improved, and the construction cost is low.

Methods and apparatus are described for producing purified oxygen using low temperature adsorption beds to remove impurities from oxygen, such as nitrogen-containing impurities (e.g., nitrogen (N2), nitrogen oxides, ammonia, amines), water, carbon dioxide, carbon monoxide, hydrocarbons, etc.

The invention relates to the technical field of nuclear reactor engineering, and discloses a high-temperature gas cooled reactor liquid nitrogen recycling system and method. The liquid nitrogen recycling system for the high-temperature gas cooled reactor comprises a low-temperature adsorber, a high-temperature gas cooled reactor, a high-temperature gas cooled reactor, a high-temperature gas cooled reactor and a low-temperature gas cooled reactor, the low-temperature adsorber is communicated with an exhaust pipeline, the exhaust pipeline is communicated with the atmosphere, the exhaust pipeline is communicated with a circulation branch, and an inlet and an outlet of the circulation branch are both communicated with the exhaust pipeline; and a heat dissipation mechanism is installed in the main steam pipe valve room, and the heat dissipation mechanism is installed on the circulation branch so that heat exchange can be conducted between air in the main steam pipe valve room and liquid nitrogen in the circulation branch. Volatile low-temperature nitrogen is introduced into the heat dissipation mechanism for heat exchange, reutilization of liquid nitrogen cooling capacity is achieved, cooling capacity resource waste caused by direct emission of the low-temperature nitrogen is reduced, and therefore the system resource utilization rate is increased; and the temperature between the main steam pipe valves is actively reduced through the cooling capacity of the volatilized low-temperature nitrogen, external energy consumption input can be reduced, and the overall energy efficiency of the system is improved.

A low-temperature adsorption-regeneration purification system for flue gas. The system comprises a spray cooling tower (1), an adsorption tower (2), a first heat exchanger (4), a regeneration tower (3) and a cold energy recovery assembly (6), wherein the spray cooling tower (1) is configured to cool flue gas introduced thereinto to low-temperature flue gas at sub-zero temperatures; the adsorption tower (2) is configured to adsorb and purify into clean flue gas the low-temperature flue gas discharged from the spray cooling tower; the first heat exchanger (4) is configured to exchange heat between the clean flue gas discharged through a flue gas outlet (22) and a first medium introduced through a first hot-side inlet (41) in the first heat exchanger (4); a regeneration section of the regeneration tower (3) is configured to heat an adsorbent to regenerate the adsorbent, while a cooling section (33) is configured to cool the regenerated adsorbent; and the cold energy recovery assembly (6) is configured to recover cold energy from the clean flue gas discharged from the adsorption tower (2) and / or cold energy from clean flue gas discharged through a first cold-side outlet (44). The low-temperature adsorption-regeneration purification system for flue gas can recover and utilize cold energy in flue gas multiple times, thereby reducing the consumption of other energy sources.

The present invention relates to the field of hydrogen purification, and in particular to a method for preparing and purifying hydrogen for fuel cells and a system device thereof. The raw hydrogen is respectively heat exchanged with the product gas and the regenerated gas after the expansion heat exchange through the heat exchange mechanism I, i.e., the N-stage heat exchanger, and a part of the hydrogen is separated and enters the refrigeration mechanism to obtain supercooled hydrogen. The raw hydrogen and the supercooled hydrogen are cooled by the heat exchange mechanism II and then enter the adsorption mechanism. The impurities in the raw hydrogen are purified to meet the requirements of hydrogen for fuel cells through the low adsorption mechanism, thereby obtaining hydrogen product gas for fuel cells; the cold hydrogen is heated by the heater, and the heated hydrogen is used as the medium for regeneration and reheating of the low-temperature adsorption mechanism and thermal regeneration. The purified product gas returns to the heat exchange mechanism I to exchange heat with the raw hydrogen, and is output to the storage device or other processing equipment after heating. The impurity content S in the obtained product gas is less than 0.004ppm, and CO is less than 0.02ppm, which ensures the long-term stable operation of the fuel cell.

The invention discloses a helium purification method capable of preventing catalyst poisoning, which comprises the following steps: cooling raw material gas until miscellaneous gas with liquefaction temperature equal to or higher than that of nitrogen in the raw material gas is liquefied, carrying out gas-liquid separation to obtain intermediate product gas containing neon gas, hydrogen gas and helium gas, and adsorbing the neon gas in the intermediate product gas at low temperature to obtain mixed gas, the miscellaneous gas contains nitrogen; hydrogen in the mixed gas is removed through a catalyst, so that a helium product is obtained, and at least one first type of gas capable of poisoning the catalyst exists in the offensive gas. The explosion risk can be eliminated, external gas is not needed, the process is simplified, and safety is improved. The temperature optimization catalytic reaction can improve the hydrogen removal rate and prolong the service life of the catalyst, the extraction of byproducts of high-purity hydrogen and neon can increase the resource utilization rate, and the limitation of the traditional process is broken through.

The present invention provides a cryopump and a regeneration control method thereof. The cryopump includes a cryopump container, a cold shield unit, an adsorption array, a regeneration unit, and a refrigeration unit. The cold shield unit is installed inside the cryopump container, and the adsorption array is composed of an outer condensation shielding plate and an inner cryogenic adsorption plate, and the surface is electroplated and polished. The cooling structure adopts a combination connection method of a main cooling plate and an annular secondary cooling plate to realize the separate disassembly and assembly of the condensation shielding plate and the cryogenic adsorption plate. The regeneration control method monitors the pressure in the container in real time, calculates and processes the pumping speed data. When the pumping speed is lower than the set threshold, the system automatically starts the regeneration process and selects different regeneration strategies (primary, secondary, and complete regeneration) according to the environment and gas type. During the regeneration process, it is determined whether it is completed by temperature data. After the regeneration is completed, the system resumes normal operation and continues to evacuate. The overall process ensures the continued effectiveness and system stability of the cryopump.

The invention discloses a purification system for separating feed gas in 13C stable isotope by a low-temperature rectification method, and belongs to the technical field of low-temperature rectification, the purification system comprises a feed gas tank, a normal-temperature adsorption device, a low-temperature adsorption device and a refrigerant supply device, a motor is mounted at the top end of the normal-temperature adsorption tank, and a support frame is mounted in the normal-temperature adsorption tank; the rotating shaft rotates between the top wall of the normal-temperature adsorption tank and the supporting frame and is connected with the motor, the spiral blade is installed on the lower portion of the rotating shaft, the top end of the normal-temperature adsorption tank is provided with a filler funnel, and the bottom end of the normal-temperature adsorption tank is provided with a discharging port. And the refrigerant supply device is communicated with the top end of the low-temperature adsorption device. New adsorption materials are added to the top end of the normal-temperature adsorption tank, the spiral blades convey the waste adsorption materials to the bottom end of the normal-temperature adsorption tank through rotation of the rotating shaft, uninterrupted updating of the adsorption materials is achieved, and the purification effect of feed gas is guaranteed.

Disclosed is a low-temperature adsorption system, comprising: an adsorption module and a heat exchange module. The adsorption module is used for adsorbing low-temperature flue gas at a temperature below room temperature to be purified into low-temperature clean flue gas. The adsorption module has a gas inlet end used for inputting the low-temperature flue gas, an air outlet end used for discharging the low-temperature clean flue gas, a feeding end used for inputting an adsorbent and a discharging end used for discharging the adsorption-saturated adsorbent. A cold side inlet of the heat exchange module is communicated with the air outlet end of the adsorption module, the low-temperature clean flue gas enters a cold side of the heat exchange module to exchange heat with substances on a hot side of the heat exchange module so as to recover the cooling capacity in the low-temperature clean flue gas, and the cooling capacity is used for cooling the adsorbent before being input into the adsorption module.