49results about How to "Reduce cold loss" patented technology

The invention discloses a natural-gas flow-temperature helium extracting system and a natural-gas flow-temperature helium extracting method. According to the system and the method, the post-expansion and nitrogen circulating refrigerating two-column separating technology is carried out for fully recovering the cooling capacity of the device in order to pre-cool the natural gas which serves as the raw material, and thereby the system can be applied to the natural gas which has an extremely low content of helium, and has the characteristics of being low in energy consumption, high in helium recovery rate, small in investment, flexible in operation, and high in adaptability to variable working conditions. The system and the method have the positive effects that little helium in the helium-containing natural gas can be extracted by a pre-cooling system and a low-temperature rectifying system, an independent nitrogen circulating refrigerating system is adopted and used for supplying an ultralow-temperature cold source required in helium concentration, and the independent system is rich in adjusting means and cannot be influenced by upstream operations; and a post-expansion refrigerating system is adopted, so that the natural-gas low-temperature helium extracting system has the operation pressure higher than that in conventional technology, and higher concentration of the helium can also be obtained at the same refrigerating temperature.

The invention relates to a gas dispensation automatic control method and a liquefied natural gas vehicle gas dispenser. The gas dispenser comprises a pipeline system and a control system, wherein the pipeline system comprises a liquid inlet pipeline system and a gas return pipeline system; the liquid inlet pipeline system comprises an added liquid mass flowmeter, a gas dispensation hose and a gas dispensation gun; the gas return pipeline system comprises a gas return hose, a pressure regulating valve and a return gas mass flowmeter; a first control valve is arranged between the added liquid mass flowmeter and the gas dispensation hose, and a pressure transmitter is arranged between the pressure regulating valve and the gas return hose; and the control system comprises a judging and executing unit and is used for controlling the on-off of the first control valve according to a signal of a return gas mass flowmeter or the pressure transmitter. The invention realizes the automatic control of the gas dispenser through setting the judging and executing unit, avoids the excess filling of a vehicle-mounted low-temperature gas bottle, solves the problem of pressure jump in the gas bottle, which is brought by excess filling, to ensure that the pressure in the vehicle-mounted low-temperature gas bottle can be controlled after gas dispensation and guarantees the running safety and reliability of the vehicle-mounted low-temperature gas bottle.

The invention provides a high-efficient and energy-saving air-conditioning system used for district cooling, which comprises a refrigeration host, a chilled water primary pump, a chilled water secondary pump, a plate heat exchanger, a new air processing device, a return air processing device, a new air pre-processing device, a user chilled water circulating pump and a total heat exchanger. The invention further provides a realization method of the air-conditioning system. The high-efficient and energy-saving air-conditioning system and the realization method of the invention are based on the second law of thermodynamics and the economic optimized scientific energy utilization principle, and realizes the purposes of increasing the temperature difference between the supply water and the return water of a chilled water secondary pipeline and reducing the flow rate thereof by the method of connecting two levels of refrigeration with the refrigeration host in series and the innovative cold energy gradual utilization of a tail-end device. Therefore, the energy consumption of the chilled water secondary pump and the initial investment of the secondary pipeline network are reduced, the economic benefits and the energy utilization ratio are improved, and the advantages of the district cooling system are further played.

The invention provides a method for air separation production on the liquid oxygen and the liquid nitrogen through the LNG (Liquefied Natural Gas) cold energy. According to the all-liquid air separation method, the investment is less, the energy-saving rate is high, the energy consumption is low, the cold loss is small, the output of the liquid nitrogen and the liquid oxygen is large, and the production cost can be greatly reduced. According to the technical scheme, the implementation steps of the method includes that the raw nitrogen from an air separation tower cold box is reheated through a main heat exchanger cold box to join the medium-pressure and low-temperature nitrogen separated through a gas and liquid separation tank to be reheated through a circulating heat exchanger cold box, the reheated low-pressure and low-temperature nitrogen is reheated through the circulating heat exchanger cold box, and the medium-pressure and normal-temperature nitrogen boosted through a nitrogen booster enters a circulating nitrogen booster to be boosted into the high-pressure nitrogen; the high-pressure nitrogen is precooled through the circulating heat exchanger cold box; the precooled high-pressure nitrogen is fed into the air separation tower cold box to serve as an air separation cold source, the high-purity and high-pressure liquid nitrogen is obtained at the bottom of an upper tower of an LNG cold energy recovery tower cold box, the high-pressure liquid nitrogen is throttled through a throttling valve to obtain the medium-pressure liquid nitrogen and the medium-pressure nitrogen, and the medium-pressure liquid nitrogen and the medium-pressure nitrogen are throttled through the throttling valve to obtain a low-pressure liquid nitrogen product and the low-pressure nitrogen.

The invention discloses a liquid helium conveying pipeline and a heat sink interface form, mainly consisting of a heat sink pipeline (1), sealing gaskets (2), a positioning ring (3), a container flange (4), a conveying pipeline flange (5) and a liquid helium conveying pipeline (6). Polytetrafluoroethylene can be used as a material to prepare 3-10 sealing gaskets, the container flange and the heat sink pipeline are connected by welding, the conveying pipeline flange and the liquid helium conveying pipeline are connected by welding, the container flange is connected with the conveying pipeline flange through a bolt, and the liquid helium conveying pipeline adopts a double-layer vacuum Dewar pipe with less cold loss.

The invention discloses a novel external pressurized and internal liquefied pure nitrogen preparation device which comprises a filter, a turbine air compressor, an air pre-cooling unit, alternatively-used molecular sieve adsorbers, an electric heater, a main heat exchanger, a supercharging expansion machine, a rectification column I, a rectification column II, a condensing evaporator I, a condensing evaporator II, a subcooler, a liquefier and a supercharger. The invention also discloses a novel external pressurized and internal liquefied pure nitrogen preparation method. According to the device and method, sewage nitrogen reflux expansion refrigeration is adopted, the pressure utilization efficiency is high, and the energy consumption of the device is low; double tower parallel nitrogen production is adopted, the upper tower pressure can be higher or lower than the lower tower pressure, and two nitrogen products with the same pressure level or different pressure levels can be preparedsimultaneously, and some liquid nitrogen products can be prepared; and an internal liquefier and an external supercharger are arranged, the external supercharger is located outside a cold box, maintenance and overhaul are facilitated, the internal liquefier is located inside the cold box, the cold loss is small, meanwhile, the selected type of the external supercharger is not limited, and therefore the application range of the device and the method can be greatly increased.

The vacuum low temperature ball valve comprises the clamping part, seal part and the drive part, with the clamping part composed of inlet flange, outlet flange and the outside shell connected in the middle, the seal structure composed of the valve inside the jacket with both ends fixed on the inlet and outlet flanges, fixed on the spring valve base at the inlet end of the valve through the screw bolt and nut and two seal bases with seal cushion embedded at both sides, with one connected to the spring valve base and the other connected to the valve. The drive part comprises the ball floating inside the valve, both sides of the ball contacting with two seal base, sliders on the top of the ball, with spring base and spring connected to the valve at the bottom of the ball. There are valve bar, guide sleeve and drive mechanism on the slider. It has good seal feature, high reliability, less cold loss, and long working cycle.

The invention discloses a making method of liquefied natural gas (LNG), which is characterized by the following: adopting coal gas as raw material; predisposing coal gas; liquefying under low temperature; making oxygen content in the gas lower than 0.5%; pressurizing; entering into composite purifying device of solvent and molecular sieve; reducing the content of CO2, H2S and H2O to preset scale; cooling gas in the plate-fin heat exchanger to liquefy; rectifying in the fractional tower; separating methane at LNG pattern; cooling to enter LGN product reserving tank; obtaining LNG product; fitting for automobile fuel or powering.

The invention discloses an LNG special quick connector. The LNG special quick connector comprises a female connector, a sealing ring and a male connector; the female connector comprises a female connector connecting clamping head, a female connector connecting part used for dismountably connected with an external pipeline, and a female vacuum connecting pipe used for connecting the female connector connecting clamping head and the female connector connecting part; the male connector comprises a male connector connecting clamping head, a threaded pushing ring and a male connector vacuum connecting pipe; the sealing ring is embedded in the interior of the female connector connecting clamping head; the male connector connecting clamping head can be axially docked with the female connector connecting clamping head in an embedded and limited manner; the threaded pushing ring is dismountably and axially fixed to the male connector vacuum connecting pipe in a limited manner and matched with the rear end of the male connector connecting clamping head. According to the technical scheme, the connecting can be realized in the way of axially positioning the male connector connecting clamping head and the female connector connecting clamping head and then screwing in the threaded pushing ring and finally pushing the male connector vacuum connecting pipe tightly onto the pre-installed sealing ring.

The invention relates to an argon production process and a production line thereof. The process comprises the following steps: extracting argon fraction gas from a corresponding part of an upper towerof a fractionating tower; guiding the argon fraction gas from the bottom of a first crude argon column; taking coarse liquid argon discharged from the bottom of a second crude argon column on the upper part of the first crude argon column as a reflux liquid; leading coarse argon gas out from the top of the first crude argon column; feeding the coarse argon gas into a pure argon tower through thesecond crude argon column to obtain pure liquid argon in the bottom of the pure argon tower; and injecting a part of pure liquid argon in a liquid form into a user storage tank and pressurizing the other part of pure liquid argon in a cold box and feeding the same to a user pipe network. According to an industrial oxygen and nitrogen production process, the purity of a finished product of separated argon is relatively high through reasonable equipment arrangement, a pretreatment method and equipment as well as a reasonable process parameter design, the production efficiency is increased, and the production demand on high purity argon is fully met.

The invention relates to a main-sub pot-type combined container for liquid nitrogen. The container comprises sub pots, a pipeline system, an interlayer, a main pot, a measurement and control system, safety accessories and an external operation platform; the combined container for the liquid nitrogen is coated with paint and mounted on a basic platform; five sub pots are distributed concentrically to form an equilateral polygon; the pipeline system is arranged in a center area from five sub pots to the main pot; each sub pot adopts the structure of a vertical cylinder; the bottoms of the sub pots are supported by support legs; a filling opening, an air outlet, an external pressurization opening and an upper shifting filling opening are formed in each pot. The combined container can be used for implementing the processes of shifting filling, pressurization, pressure release, and real-time monitoring and control, and is ideal large-sized liquid nitrogen storage and supply equipment. The container is used for storage and supply of the liquid nitrogen, liquid is discharged out through a pressure extrusion method, the operation is simple, the reliability is high, discharge loss during the storage period is reduced through storage under pressure, compared with a spherical tank, the main-sub pot-type combined container is easier to manufacture and mount, and the manufacturing and mounting costs are low, therefore, the container has relatively high security, stability and controllability.

The invention relates to a self-pressurization device for a vehicle gas cylinder. The self-pressurization device for the vehicle gas cylinder comprises the gas cylinder, a pressure sensor, a liquid taking pipeline, an electrically operated valve assembly, a vaporizer, a gas pipeline, a gas pump, an electrical signal system and a control system. According to the self-pressurization device for the vehicle gas cylinder, the control system monitors the running conditions of an engine and a vehicle to control the actions of the gas pump and the electrically operated valve, and thus the self-pressurization process is controlled. The self-pressurization device for he vehicle gas cylinder has the advantages that the pressure in the gas cylinder is guaranteed to be stable under different running conditions of the vehicle, the gas cylinder is started normally at any working conditions, the self-pressurization system is guaranteed to be started normally at any conditions, and the cold loss of LNG is reduced to a great extent. The self-pressurization device for the vehicle gas cylinder can be used for pressurizing the gas cylinders of gas-fueled vehicles.

The invention relates to spacecraft environment simulation test equipment and discloses a 20K cold shield refrigerating device which comprises a G-M refrigerator (26), wherein the G-M refrigerator (26) is installed on an installation tool (25) through a vacuum sealing surface, a cold shield shielding plate (23) is installed on and connected with a primary cold head (24) of the G-M refrigerator (26), and a secondary cold head (22) of the G-M refrigerator (26) is connected with a 20K cold shield (21) in a fastening and heat conducting way. The 20K cold shield refrigerating device is installed at the top in a vacuum simulation cabin (12) in a vacuum sealing way through the installation tool (25). The invention solves the problems of high development cost, long development cycle and the like of the traditional equipment and has the advantages of high running reliability of the equipment, simplified operation flow, lowered equipment running cost, shortened preparation time before system boot time, and the like.

This invention relates to a mining local cool supply device, which comprises an ice storage tank and a water storage tank in the mobile vehicle, interconnected with air cooler through agent circulating pipe, wherein the agent circulating pipe is multilayer dish type heat-exchanger rig when it passes the ice storage tank, and connected with the bore-hole pump when it passes the water storage tank. By said technique, the cool supply device below the well can discharge condensation heat, and the pump does not need to do explosion-proof process; besides, the system does not need to process corrosion prevention. The invention is fit for supplying cool in mining, underground installation and tunneling operation place.

The invention relates to a pipe insulation tile which is produced by urea-formaldehyde foam powder and a preparation process. The pipe insulation tile is formed by the following components according to the ratio of parts by weight, urea-formaldehyde foam powder: polyvinyl alcohol gelatin powder: cellulose ether: waterproofing agent: water =80-120:0.5-2:0.1-0.3:0.2-0.8:5-15. The invention has small thermal conductivity factor, can effectively prevent or reduce heat in the surrounding environment from transmitting into devices, pipes and accessories under constant temperature, reduces cold loss, saves energy, prevents or reduces the temperature of cold dialectic in the devices and pipes under the constant temperature from increasing, and prevents the temperature of outer walls from lowering the temperature of the surrounding environment, and prevents the outer surface condensation of the pipe to damage a cold insulation structure, thereby prolonging the service life of cold insulation devices, and being beneficial for improving working environments. The pipe insulation tile has the advantages of corrosion resistance, anti-aging, excellent heat insulation and sound insulation value, light weight, convenient installation, durable service, long service life, environmental protection and beauty appearance.

The invention provides a liquid helium conveying system used for large-size multi-section liquid helium heat sinks and a class converting method for converting liquid nitrogen to liquid helium of the liquid helium heat sinks on the basis of the liquid helium conveying system. The liquid helium conveying system and the method are applied to an engine vacuum plume experimental study. The liquid helium conveying system comprises a heat sink system, a liquid nitrogen supplying system, a liquid helium supplying system, a nitrogen supplying system and a helium supplying system. The heat sink system comprises five large-size liquid helium heat sinks and four liquid nitrogen heat sinks. The liquid nitrogen supplying system is provided with conveying pipelines for the liquid helium heat sinks and the liquid nitrogen heat sinks, and provided with a liquid nitrogen cooling box and a liquid helium cooling box, wherein the liquid nitrogen cooling box and the liquid helium cooling box are used for centrally containing and managing liquid nitrogen adjusting valves and liquid helium adjusting valves. According to the liquid helium conveying system used for the large-size multi-section liquid helium heat sinks and the class converting method for the large-size multi-section liquid helium heat sinks, liquid helium refrigeration can be provided for the large-size multi-section liquid helium heat sinks at the same time, unified liquid supplying is achieved for all the heat sinks, operation is convenient, cost is saved, floor space is small, the valves can be centrally controlled conveniently, working efficiency is improved, and operation and maintenance are convenient.

The invention provides a two-position three-way reversing valve and a reversing method used for a small-flow liquid nitrogen low-temperature system. The reserving valve is a single electrical-controllever corrugated tube valve driven by an electromagnet, and comprises a valve body structure, a corrugated tube sealing structure, a lever hinge reinforcing structure and an electromagnet power generation structure, wherein the valve body structure comprises a valve seat, a double-conical-surface movable valve rod, an upper conical surface sealing base, a lower conical surface sealing base and a movable valve element connecting rod; the corrugated tube sealing structure comprises a corrugated tube and an elastic connector; and the lever hinge reinforcing structure comprises a first conductingpiston, a reinforcing connecting rod and a second conducting piston. The two-position three-way reversing valve has the advantages that the two-position three-way reversing valve is suitable for beingused under an ultra-low temperature environment, and is especially suitable for being used under a small-flow low-temperature environment. The cut-off valve principle is utilized for switching to thedouble-conical-surface movable valve rod for sealing and opening the upper conical surface sealing base and the lower conical surface sealing base so as to realize reversing of ultra-low-temperaturefluid. The two-position three-way reversing valve for the small-flow liquid nitrogen low-temperature system has the characteristics of a small size, a little cold loss, small leakage amount and quickresponse.

The invention discloses a mining membrane type high-low pressure conversion device, and belongs to the technical field of mine refrigeration machines. The mining membrane type high-low pressure conversion device comprises a refrigeration station arranged outside a mine and a radiator arranged in the mine, and further comprises a first container and a second container which are arranged in the mine, a first elastic membrane is arranged in the first container, a second elastic membrane is arranged in the second container, the first container and the second container are divided by the first elastic membrane and the second elastic membrane respectively into the cold water sides and the hot water sides, the cold water sides of the first container and the second container are communicated with a water outlet of the refrigeration station and a water inlet of the radiator respectively, and the hot water sides of the first container and the second container are communicated with a water return opening of the refrigeration station and a water outlet of the radiator respectively. As only membrane elastic deformation in the containers is adopted in the high-low pressure conversion process for transferring, the cold losses are small, accurate control is carried out, the working condition of the refrigeration station is matched with the actual refrigeration load, the operation energy consumption of the refrigeration station is reduced, and the temperature of a local area in the mine can be efficiently reduced.

This invention is about a cascade cold dynamic cycle refrigeration apparatus, which makes up cold energy with cryogenic liquid refrigerant by boosting with a dual-stage liquid circulating pump, after its temperature is increased via the cold regenerator, it enters the cold consuming apparatus to provide cold and becomes a gaseous refrigerant, then it flows through the expander to expand and make work by reducing pressure and temperature, and then returns to the refrigerant tank via the cold regenerator or / and throttle valve. This invention requires no circulation cooling water system as in a traditional vapor compression refrigeration apparatus, so its maintenance and operation cost can be substantially reduced, with a apparatus of the same refrigerating capacity, it can save energy by more than 30% as compared with traditional ones, as compared with traditional refrigerating circulation technology, it can adopt enhanced cold transfer elements more conveniently, with more compact refrigerating equipment and higher refrigerating efficiency.

The invention relates to a constant-temperature draught fan used on a conveying belt of spraying equipment, and belongs to the field of draught fans. The constant-temperature draught fan comprises a refrigeration main case. Air curtain machines are arranged at an air inlet and an air outlet of the refrigeration main case. A plurality of outer rotor motors are arranged at the bottom of the refrigeration main case in parallel. An evaporator and a condenser are arranged in the refrigeration main case. Heating pipes are laid in the evaporator and connected with an outer electric control box. A heat preservation box body is arranged below the refrigeration main case and erected on the conveying belt of the spraying equipment, so that the air direction is perpendicular to the moving direction of the conveying belt. A temperature control switch is arranged in the electric control box and connected with a temperature sensor. According to the constant-temperature draught fan, the optimal air supply temperature can be provided for sprayed articles according to the environment temperature, and energy consumption is low.

The invention relates to an immersed pump system in a low-temperature tank and belongs to the technical field of low-temperature liquid conveying. The problems that an existing immersed pump is not convenient to install and poor in use effect are solved. The immersed pump system comprises the low-temperature tank and an immersed pump and further comprises a pump well which is arranged in the low-temperature tank and is used for isolating the low-temperature tank and the immersed pump, a pump well upper installation seat which is arranged at the upper portion of the pump well and used for installing the pump well, and a top plate arranged on the pump well upper installation seat. A valve body is arranged at the lower portion of the pump well, and the lower portion of the valve body is connected with a valve plate through an elastic assembly. A gas phase pipeline is arranged at the upper portion of the low-temperature tank. A gas phase valve is arranged on the gas phase pipeline. The gasphase pipeline passes through the gas phase valve, then penetrates the pump well upper installation seat and then communicates with the pump well. An air inlet pipeline at the upper portion of the gas phase pipeline is provided with a nitrogen valve.

The invention discloses a device and a technological method for producing LNG (liquefied natural gas) by recycling ammonia tail gas. The device comprises a circulation nitrogen compressor, a first cooler, a second cooler, a third cooler, a pre-cooling heat exchanging device, a booster expansion turbine, a gas-liquid separator, a dehydrogenation and distillation tower and a methane distillation tower, wherein the pre-cooling heat exchanging device, the booster expansion turbine, the gas-liquid separator, the dehydrogenation and distillation tower and the methane distillation tower are arranged in a cold box; and the pre-cooling heat exchanging device comprises a carbon dioxide pre-cooler and a main heat exchanger. The device and the technological method for producing the LNG by recycling the ammonia tail gas has the advantages that by an ammonia tail gas cryogenic separation technology, methane is extracted sufficiently while useful hydrogen produced by using ammonia is recycled, the methane is liquefied into LNG with high added value, the cost of ammonia is reduced, ammonia tail gas resources are sufficiently recycled, and the environment is protected.

The present invention provides a high-efficient and energy-saving air-conditioning system used for district cooling, which comprises a refrigeration host, a chilled water primary pump, a chilled water secondary pump, a plate heat exchanger, a new air processing device, a return air processing device, a new air pre-processing device, a user chilled water circulating pump and a total heat exchanger. The present invention further provides a realization method of the air-conditioning system. The high-efficient and energy-saving air-conditioning system and the realization method of the invention are based on the second law of thermodynamics and the optimized scientific energy utilization principle of exergy economics, and realizes the purposes of increasing the temperature difference between the supply water and the return water of a chilled water secondary pipeline and reducing the flow rate thereof by the method of connecting two levels of refrigeration with the refrigeration host in series and the innovative cold energy gradual utilization of a tail-end device.

The present invention provides double tower low temperature rectification process of preparing high purity oxygen. Industrial liquid oxygen material with oxygen content of 99.6 % is low temperature rectified in two structured packing towers to obtain electronic industry level high purity oxygen of oxygen content not lower than 99.9998 % and impurity contents including N2 not more than 0.5 ppm, CH4 not more than 0.1 ppm, H2O not more than 0.1 ppm, and Ar not more than 0.5 ppm. The process of preparing high purity oxygen has best utilization of energy, low cold loss, low power consumption and low cost, and is suitable for industrial production.

The invention relates to a cryostat for a superconducting cable. The superconducting cable includes a cable frame located at the axis of the cable as well as a superconducting tape, an insulating tape, a low-temperature maintaining inner tube, an insulating layer and an outer sheath which are arranged on the cable frame from inside to outside sequentially; the cryostat comprises a cooling bushing, a vacuum bushing, a liquid nitrogen cold screen bushing and a shell which are coaxial with the superconducting cable and are located on the outer sheath from inside to outside sequentially; and two ends of the cooling bushing which is connected with a heat emission amount measuring device are respectively connected with a liquid nitrogen cold screen filled with liquid nitrogen. With the cryostat for the superconducting cable of the invention adopted, low-temperature requirements of the superconducting cable can be satisfied, and the heat emission amount of the body of the cable can be monitored in real time, and production and use cost can be decreased.

The invention discloses a self-cold-insulation compensator for a low-temperature pipeline. The self-cold-insulation compensator comprises a shell and a connecting mechanism, wherein the connecting mechanism is arranged on the shell, and the connecting mechanism comprises an inlet end connecting pipe, two PIR cold insulation assemblies, a first cold insulation sleeve, an inner-layer corrugated pipe, a stay rod assembly, an outer-layer corrugated pipe, an electric heat tracing assembly, a second cold insulation sleeve and an outlet end connecting pipe. According to the self-cold-insulation compensator for the low-temperature pipeline, through mutual cooperation of the shell, the inlet end connecting pipe, the PIR cold insulation assemblies, the first cold insulation sleeve, the inner-layer corrugated pipe, the stay rod assembly, the outer-layer corrugated pipe, the electric heat tracing assembly, the second cold insulation sleeve, the outlet end connecting pipe, pipe connecting flanges, a vacuumizing opening, an electric heat tracing connector, a pressure gauge connector and a standby opening, the self-cold-insulation compensator for the low-temperature pipeline is achieved; and on the premise of ensuring that the compensator can be used under the designed working conditions, the cold loss amount of the pipeline can be effectively reduced, the service life of the compensator is prolonged, and therefore the practicability is improved; and great convenience is brought to a user.