6130 results about "Liquid nitrogen" patented technology

A power plant including an air separation unit (ASU) arranged to separate nitrogen, oxygen, carbon dioxide and argon from air and produce a stream of substantially pure liquid oxygen, nitrogen, carbon dioxide and argon; a steam generator, fired or unfired, arranged to combust a fuel, e.g., natural gas, liquefied natural gas, synthesis gas, coal, petroleum coke, biomass, municipal solid waste or any other gaseous, liquid or solid fuel in the presence of air and a quantity of substantially pure oxygen gas to produce an exhaust gas comprising water, carbon dioxide, carbon monoxide, nitrogen oxides, nitrogen, sulfur oxides and other trace gases, and a steam-turbine-generator to produce electricity, a primary gas heat exchanger unit for particulate/acid gas/moisture removal and a secondary heat exchanger arranged to cool the remainder of the exhaust gases from the steam generator. Exhaust gases are liquefied in the ASU thereby recovering carbon dioxide, nitrogen oxides, nitrogen, sulfur oxides, oxygen, and all other trace gases from the steam generator exhaust gas stream. The cooled gases are liquefied in the ASU and separated for sale or re-use in the power plant. Carbon dioxide liquid is transported from the plant for use in enhanced oil recovery or for other commercial use. Carbon dioxide removal is accomplished in the ASU by cryogenic separation of the gases, after directing the stream of liquid nitrogen from the air separation unit to the exhaust gas heat exchanger units to cool all of the exhaust gases including carbon dioxide, carbon monoxide, nitrogen oxides, nitrogen, oxygen, sulfur oxides, and other trace gases.

The invention relates to a plunger pump used for pumping ultralow-temperature liquid nitrogen, which comprises a power end and a cold end, wherein the cold end comprises a cold end shell; one end of the cold end shell is provided with a plunger; the other end of the cold end shell is provided with a suction inlet and an exhaust port; the positions of the suction inlet and an exhaust port of the cold end shell are provided with a valve seat; one end of the plunger is connected with a power end; the other end of the plunger is mutually matched with the cold end shell and the valve seat to form an inner cavity; the valve seat is provided with a first channel and a second channel, wherein the first channel is used for communicating the inner cavity with the suction inlet; the second channel is used for communicating the inner cavity with the exhaust port; a lower-pressure valve used for controlling the liquid nitrogen to be sucked into the inner cavity is arranged between the first channel and the inner cavity; a high-pressure valve used for controlling the liquid nitrogen to be discharged out of the inner cavity is arranged in the second channel; the plunger is driven by the power end to carry out linear reciprocating motion in the inner cavity so as to drive the lower-pressure valve or the high-pressure valve to be opened and closed; when the low-pressure valve is opened, the liquid nitrogen enters the inner cavity from the suction inlet; when the high-pressure valve is opened, the liquid nitrogen is discharged out of the inner cavity from the exhaust port; and the cold end shell is provided with an overflow port communicated with the inner cavity.

The invention belongs to the technical field of low-temperature high-pressure plunger pumps, and particularly relates to a cold end of a low-temperature high-pressure plunger pump. The cold end comprises a cold end shell body, a plunger and a cylinder sleeve, wherein the plunger is arranged inside the cylinder sleeve, the cylinder sleeve is located inside the cold end shell body, a connecting locking device is arranged at the front end of the cold end shell body, the cold end shell body comprises a left cavity and a right cavity which communicate with each other, the right cavity internally comprises the cylinder sleeve, a valve set and a discharging flange, and the valve set comprises a valve seat, a high-pressure valve arranged in the valve seat and a low-pressure valve arranged betweenthe cylinder sleeve and the valve seat. According to the cold end of the low-temperature high-pressure plunger pump, the novel valve set structure adopts metal sealing, continuous opening and closingof the high-pressure valve and the low-pressure valve are achieved, and normal-pressure ultralow-temperature liquid nitrogen is converted into high-pressure low-temperature liquid nitrogen and is discharged so that the requirement for high-frequency opening and closing can be met, the characteristics of being low in conveying medium temperature and high in output pressure are achieved, and the problem that a common plunger pump cannot pump the low-temperature and high-pressure liquid nitrogen is solved.

A mechanism for limiting vibration amplitudes in a pumping system includes a plurality of pendulum absorbers coupled with a carrier and each having a pivoting range. The pendulum absorbers each further include a first and a second contact surface that contacts an outer peripheral surface of the carrier at limit stop positions, and each having a shape that is conforming with a shape of the outer peripheral surface. The pumping system may be used for pumping liquid nitrogen.

The invention provides a liquid nitrogen pump power end assembly. The liquid nitrogen pump power end assembly comprises a crankshaft box assembly. The crankshaft box assembly is correspondingly connected with crosshead shell assemblies. Lubricating systems are correspondingly arranged between the crankshaft box assembly and the crosshead shell assemblies. The liquid nitrogen pump power end assembly adopts split type module combination of the crankshaft box assembly and the crosshead shell assemblies to be assembled, a crankshaft box is designed into a welding type, crosshead shells are designed into a casting type, compared with inblock casting or overall welding, the structure is simple and compact, existing machining manners are considered, machining, manufacturing, assembling, repairingand maintaining are facilitated, crossheads are provided with threads for connection and can be connected with fluid ends with different specifications on the market to play a role in transmitting power, a crankshaft adopts a split type structure that a straight shaft and multiple eccentric wheels are connected through flat keys, the crankshaft overall machining difficulty is lowered, crosshead hinge pins are provided with jackscrew holes, by means of jackscrew fixing, axial floating of hinge pins can be eliminated, the lubricating system can protect movement members, and the service life ofeach movement member is prolonged.

The invention relates to the field of oil and natural gas prospecting and exploitation, and provides a method of low-temperature gas-assisted coalbed methane fracturing technology. According to the method, by the aid of ultralow temperature characteristics of liquid nitrogen, cold shock transformation and ice formation are performed on a coalbed, ice blockage is caused to high-permeability channels (such as fractures), and effect of inorganic harmless dissoluble flowback fluid loss additives, even fracturing diverters and the like is achieved, so that the purpose of improving conventional coalbed methane fracturing technology is achieved. The method of the fracturing technology is suitable for primary fracturing of coalbed methane wells non-fractured or with natural fractures existing at the well bottoms, as well as refracturing of coalbed methane wells already fractured but low in productivity.

A method for developing a sub-sea hydrocarbons field includes sub-sea wells, sub-sea oil/gas separation, storing the degassed oil in a storage tank located or the seabed, liquefying natural gas aboard a vessel using liquid nitrogen aboard the vessel to obtain liquefied natural gas, transporting the liquefied natural gas to an onshore terminal, re-gasifying the liquefied natural gas, and obtaining a new batch of liquid nitrogen using energy recovered from the re-gasifying the liquefied natural gas.

RFID tags are affixed to vials used to store samples, such as biological samples stored in liquid nitrogen dewars or mechanical freezers. In one set of embodiments, an RFID tag is inserted into a recess at the bottom of a vial and held in place by an insert that engages with vial structure. In another set of embodiments, the RFID tag is retained in the recess by directly engaging with the vial structure and without using a separate insert. Mechanisms for keeping the insert and/or tag in place include tabs that gouge into the vial material, clips that allow the insert/tag to be inserted, but not removed, and holes in the side wall of the vial recess that receive tabs extending from the insert/tag. Tag-insertion techniques enable tags to be affixed to vials either before or after insertion of the sample, thereby enabling retrofitting of existing sample-storing vials with tags.

Dry stabilizing compositions for bioactive materials include sugars and hydrolyzed proteins, and may be formed into tablets or other forms providing enhanced stability for the bioactive material. Compositions containing the bioactive materials may be produced by a method that includes (a) combining the bioactive material with other ingredients in an aqueous solvent to form a viscous slurry; (b) snap-freezing the slurry in liquid nitrogen to form solid frozen particles, beads, droplets or strings; (c) primary drying by water removal under vacuum of the product of step (b) while maintaining it at a temperature above its freezing temperature; and (d) secondary drying of the product of step (c) at maximum vacuum and a temperature of 20° C. or higher for a time sufficient to reduce the water activity to below 0.3 Aw.

The invention discloses a human placenta, umbilical cord mesenchyme stem cell bank and its making method. The method includes the following steps: the first is taking human placenta, umbilical cord to test; smashing after cleaning by phosphate buffer; adding phosphate buffer to dilute; the second is adding collagenase to digest; the third is adding phosphate buffer; the fourth is adding trypsinization; the fifth is mixing the cell from the second and fourth, centrifuging, removing supernatant, cleaning by the phosphate buffer, centrifuging, and removing supernatant; the mesenchyme stem cell are gained; the sixth is freezing them in liquid nitrogen; saving by ABO/Rh subtype and HLA subtype; setting recallable cell information file. The invention is newborn storage placenta and umbilical cord mesenchyme stem cell. It can offer mesenchyme stem cell to treat the disease for personal, family and others.

The invention relates to an online gas volatile organic matter analyzer and a using method thereof. The analyzer comprises a sampling device (1), a gas supplying device (2) and a refrigerating device (3), wherein the refrigerating device (3) is connected with the sampling device (1) and the gas supplying device (2) respectively. A double-hollow-pipe cold enriching double-detector gas online volatile organic matter analyzer further comprises a gas flow control device (4), an analysis device (5) and a data acquiring and processing device, wherein the gas flow control device (4) is connected with the sampling device (1) and the gas supplying device (2) respectively; the analysis device (5) is connected with the gas flow control device (4); and the data acquiring and processing device is connected with the analysis device (5). The invention has the advantages: ultralow temperature refrigeration is realized by adopting an electronic refrigerating technology, so that the defects of frequent addition of liquid nitrogen during refrigeration with liquid nitrogen and limit on the application conditions are overcome, the analyzer can run automatically continuously for a long time, and automatic operation is convenient.

The invention discloses a cryogenic vial storing and fetching device. The cryogenic vial storing and fetching device comprises a frame and a liquid nitrogen cylinder, wherein the liquid nitrogen cylinder is located in the frame; the liquid nitrogen cylinder comprises a cylinder body and a moving mechanism; the cylinder body is provided with a sealed opening; the sealed opening is provided with a first thermal insulation shell; the moving mechanism is arranged in the cylinder body and is used for moving hanging baskets in the liquid nitrogen cylinder to the opening; the cryogenic vial storing and fetching device further comprises a hoisting mechanism, a tray shoveling mechanism and a vial selecting mechanism; the hoisting mechanism is used for hoisting a hanging basket at the opening into the first thermal insulation shell; the tray shoveling mechanism is used for storing or fetching a cryogenic tray from the hanging basket which is hoisted by the hoisting mechanism; and the vial selecting mechanism is used for storing or fetching a cryogenic vial from the cryogenic tray which is fetched by the tray shoveling mechanism. By adopting the cryogenic vial storing and fetching device, the process for selecting a single target cryogenic vial for biological samples is realized; and during the whole selecting process, the cryogenic vials are all in a liquid nitrogen environment, and non-target cryogenic vials are prevented from being exposed at environment temperature, so that the activity of the biological samples is ensured.

The invention relates to a dry ice sublimation hole bottom refrigerating and pressure keeping sampler and a sampling method. The device is mainly composed of a suspension differential action mechanism, a single action mechanism, a control mechanism, a refrigerating mechanism and a pressure keeping mechanism. The method comprises: using dry ice as refrigerant, alcohol as refrigeration assisting catalyst and secondary refrigerant, and applying low temperature alcohol to the hole bottom to refrigerate the rock core; closing a ball valve to keep pressure of the rock sample so as to inhibite the decomposition of the hydrate rock core; dismounting a blocking tube and a drill bit when sampling, dismounting a clamp spring and a clamp spring seat, pulling out a half combining tube and the rock core from the rock core tube, and using a liquid nitrogen holdup vessel or a high pressure container to keep the rock core sample. When drilling for sampling the rock core, the external tube and the drill bit gyre, but the internal tube assembly does not gyre, thus avoiding the damage of mechanical force to the rock core caused by the gyrus of the drilling tool to a larger degree, improving the rock core sampling rate, integrity and representativeness more effectively, and realizing pure refrigeration sampling as well as a combination of refrigeration sampling and rock core pressure keeping; compared with the prior art, the invention has simple process, convenient operation and greatly reduces the cost.

The invention relates to a hole bottom freezing cord coring drill and a coring method thereof. In the invention, liquid nitrogen is taken as a refrigerant; the liquid nitrogen absorbs heat in the gasification process so as to freeze a core at a hole bottom and inhibit a natural gas hydrate from being decomposed. The drill comprises an outer tube assembly and an inner tube assembly; and in the process of acquiring the core, a sand hitch is utilized to drag the inner tube assembly out from the outer tube assembly, an end cover and a clamp spring are dismounted, a semi-closed tube and a core sample are pumped out together from a core tube, the two ends of the semi-closed tube are sealed by rubber plugs, and the core sample and the semi-closed tube are stored in a liquid nitrogen hold-up vessel or a high-pressure container together. The invention has the advantages that rapid freezing can be realized, and the freezing effect is good; since cord coring and hole bottom freezing are combined, rapid coring without lifting the drill is achieved; in the drilling process, the inner tube assembly does not rotate, thus damages on a hydras core caused by mechanical force generated by rotation of the drill is avoided to a greater degree, the percentage of coring, the core integrity degree and the representativeness are more effectively improved; and semi-closed tube type rapid ground surfacesampling is adopted, thus the core can be rapidly obtained from the ground surface.

A submerged turbine generator is operated by a working fluid, such as liquid nitrogen, liquefied natural gas, or liquid ethylene, to generate electric power. The submerged turbine generator includes a shaft, a casing, a turbine having a runner fixed to the shaft, a generator having a rotor fixed to the shaft and a stator surrounding the rotor, and bearings for rotatably supporting the shaft. The runner is rotated integrally with the shaft by the pressure of the working fluid introduced into the casing. The shaft includes at least two members.

A positive electrode active material for lithium-ion rechargeable batteries of general formula Li_1+xNi_αMn_βA_γO₂ and further wherein A is Mg, Zn, Al, Co, Ga, B, Zr, or Ti and 0<x<0.2, 0.1≦α≦0.5, 0.4≦β≦0.6, 0≦γ≦0.1 and a method of manufacturing the same. Such an active material is manufactured by employing either a solid state reaction method or an aqueous solution method or a sol-gel method which is followed by a rapid quenching from high temperatures into liquid nitrogen or liquid helium.

A high-temperature superconducting magnetic levitation motor is formed by a superconducting motor rotor (1), a motor stator (2), superconducting bearing rotors (3), permanent magnetic bearing stators (4), a rotary dewar (5), an electromagnetic screen (6), torque tubes (7), mechanical protection bearings (8), a main shaft (9), a low-temperature liquid (gas) inlet pipeline (10) and a low-temperature liquid (gas) outlet pipeline (11). The superconducting motor rotor (1) and the superconducting bearing rotors (3) are arranged in the rotary dewar (5) and are cooled by liquid nitrogen or liquid neon or liquid helium or cold helium, the motor stator (2) and the permanent magnetic bearing stators (4) are arranged outside the rotary dewar (5) and are coaxial with the rotary dewar (5), and the two mechanical protection bearings (8) are used in a left and right mode in the radial direction for protecting against the influence brought by the failure of superconducting bearings.

The present invention discloses a spongy-like lightweight graphene aerogel preparation method, which comprises: preparing a graphene oxide colloid solution with a concentration of not more than 10 mg/mL; adding a surfactant with a concentration of 0.01-0.1 wt% into the graphene oxide dispersion, and completely dissolving to obtain a foam-like graphene oxide foam suspension; and immediately placing the foam system into liquid nitrogen after completing the foaming, carrying out rapid freezing shaping, carrying out freeze drying, and removing the water to obtain the graphene aerogel material. According to the spongy-like lightweight graphene aerogel of the present invention, the solution system surface tension is reduced, and the dispersion property of the graphene oxide in the solvent is improved while the specific surface area of the aerogel material is further increased so as to improve the adsorption property on dyes, organic solvents and other substances; and the prepared spongy-like lightweight graphene aerogel material has characteristics of simple process, low cost, stable structure, excellent performance, and maximal maintaining of the excellent properties of the graphene material.

An air separator using the cold energy generated by liquefying natural gas to prepare liquefied oxygen, liquefied nitrogen and liquefied argon is based on existing air separator, and features that the multi-stage circulating nitrogen compressors, LNG heat exchanger and circulated nitrogen heat exchanger are additionally used to form a combined refrigerating system, and an air cooling system is also used.