48results about How to "Shorten pre-cooling time" patented technology

The invention which is suitable for the technical field of drying provides a fruit vacuum freeze drying method. The method comprises the following steps: prefreezing: refrigerating fruits to be dried; and carrying out five-stage drying under vacuum conditions. The fruit vacuum freeze drying method of the invention, which adopts a five-step gradient cooling mode of the heating temperature, allows heat required by water sublimation to be guaranteed, cooling to be timely, the basic balance of the heat supply and demand to maintained, the material dissolving caused by too fast heating to be prevented, and the water sublimation rate to be accelerated.

The invention discloses a superconducting cable. The cable comprises an external wrapping insulating protective layer, a conduit arranged in the external wrapping insulating protective layer and a superconductor arranged in the conduit, the conduit is provided with a nitrogen inlet tube and a nitrogen outlet tube, both the nitrogen inlet tube and the nitrogen outlet tube penetrate the external wrapping insulating protective layer, and the superconductor is of a hexagonal grid type and forms a tubular spatial topology structure. Precooling time, before use, of the superconducting cable is short.

The invention discloses a hollow packaging box made of high-concentration ozone ice crystals, aiming to overcome defects that normal ice can only cool and suppress breeding of microorganisms and viruses and bacteria attached on surfaces of storages but cannot sterilize the same, and storages are short in preservation period, high in loss and poor in quality due to the fact that the ozone component in ozone ice is easy to decompose. The hollow packaging box made of the high-concentration ozone ice crystals comprises an ice-crystal made packaging box body, an ice-crystal made packaging box cover and an ozone and water solution pouring inlet. By utilizing double functions of bacterium inhibition and sterilization of the ozone component in the hollow ice crystals and an aseptic environment in a closed semi-vacuum state, the design purposes of prolonging the preservation period of the storages and improving green quality thereof are achieved. The hollow packaging box made of the high-concentration ozone ice crystals has the advantages of providing a proper environment capable of killing the microorganisms, viruses and moulds, decomposing harmful components, such as hormone, antibiotics, additives, pesticide residues, heavy metal, containing in the storages, and leading to the dormancy state of the storages within a short time, shortening the precooling time, prolonging the preservation period without any preservatives, improving green quality and being recycled.

The invention discloses a cold-chain transportation box and a cold-chain transportation method thereof, and relates to the technical field of medical cold-chain transportation. The cold-chain transportation box comprises a heat preservation box, an ice raft is arranged in the heat preservation box, the heat preservation box comprises an inner box chamber and an interlayer box chamber, the ice raftcomprises an inner ice raft and an interlayer ice raft, the inner ice raft is arranged in the inner box chamber, and the interlayer ice raft is arranged in the interlayer box chamber; and the inner box chamber communicates with the interlayer box chamber, and a circulating device used for achieving air flow exchange between the inner box chamber and the interlayer box chamber and an internal temperature detection system used for detecting the temperature in the inner box chamber are arranged in the heat preservation box. The interlayer ice raft and the inner ice raft in the interlayer box chamber can be pre-cooled at the same time, so that the pre-cooling time of the cold-chain transportation box is shortened; and when the internal temperature detection system detects that the internal environment temperature of the heat preservation box is distributed unevenly, the circulating device can achieve air flow circulating communication between the interlayer box chamber and the inner box chamber, so that the temperature of the environment in the heat preservation box is distributed evenly, and then the purpose of consistency of the refrigeration environment of medicine supplies is achieved.

The invention discloses a low temperature storage tank pre-cooling system. The low temperature storage tank pre-cooling system comprises a low temperature storage tank No. 1, a low temperature storagetank No. 2, a low temperature storage tank No. 3, a pre-cooling main pipe and a gas phase external transportation main pipe, wherein a pre-cooling main pipe valve is arranged on the pre-cooling mainpipe; and a gas phase external transportation main pipe valve is arranged on the gas phase external transportation main pipe. The low temperature storage tank pre-cooling system has the beneficial effects that the low temperature storage tank pre-cooling system is simple and convenient to operate; the utilization rate of the cold energy of a liquid phase low temperature medium is high; the pre-cooling efficiency is high; the problem that when a low temperature storage tank is pre-cooled, the cold energy is largely wasted, and the pre-cooling cost is high, is solved; meanwhile the efficiency ofsimultaneously pre-cooling multiple low temperature storage tanks in a tank field is improved; the pre-cooling time is saved; and the investment of owners in the pre-cooling of the storage tanks is greatly reduced.

The invention provides an LNG storage tank automatic pre-cooling system based on efficient communication and a pre-cooling method. A CFD numerical simulation module is used for conducting pre-cooling process simulation, and initial flow parameters are provided for the pre-cooling process; and the point positions are installed on a storage tank in a modularized manner, and signal transmission between all sensors in the pre-cooling system and an integrated operation platform is achieved through 5G technology. According to the LNG storage tank automatic pre-cooling system and the pre-cooling method, limit values of parameters such as temperature drop rate, thermal stress, temperature difference between two adjacent points, inner tank pressure and the like are set on the basis of the integrated operation platform, monitoring results and the limit values are compared and analyzed, and then an electric control valve module and a variable frequency pump module are automatically adjusted, so that the conveying flow of a pre-cooling medium is adjusted, and it is guaranteed that the pre-cooling process is stably and safely carried out. According to the LNG storage tank automatic pre-cooling system and method, automatic, integrated and integrated control over the pre-cooling process can be achieved, monitoring personnel do not need to be arranged at monitoring points for a long time, potential safety hazards are avoided, manpower and material resources are saved, pre-cooling control is more accurate, and the pre-cooling efficiency is high.

The invention relates to the technical field of cryogen recycling of the oil-gas industry, in particular to a technical method for totally recycling mixed cryogens. Cold cryogens and hot cryogens are isolated into two systems and recycled respectively. The hot low pressure cryogens are pressurized to be at a high pressure through a small compressor and stored in the high pressure state. The hot high pressure cryogens are recycled to a cryogen recycling tank through a cryogen pump, and after being depressurized, other gas phases are pressurized through a compressor to be recycled. The pressure of the low temperature cryogens is supplemented through a system, the low temperature cryogens are recycled to a low-temperature-cryogen recycling tank and stabilized by controlling the temperature, and when starting is carried out again, the low temperature side of a cold box is directly supplemented with the low temperature cryogens. The pre-cooling time is shortened, and meanwhile the cryogens can be totally recycled.

The invention discloses an external water tank and an ice maker. The external water tank is of an inverted cone structure. The ice maker comprises an ice maker body and the external water tank arranged outside the ice maker body. The external water tank communicates with an internal water tank located in the ice maker body. A flow controller is arranged in a communicating channel between the external water tank and the internal water tank. The external water tank is used for supplement so that the size of the internal water tank can be designed to be smaller; on the one hand, the external water tank can supply water into the internal water tank continuously according to requirements, and thus the defect of frequently adding water into the internal water tank can be overcome; and on the other hand, the volume of the internal water tank is reduced, the amount of water contained in the internal water tank is reduced accordingly, the amount of water, needing to be pre-cooled before ice making, in the internal water tank is reduced, the pre-cooling time is shortened, and thus the effect of improving the ice making efficiency can be achieved.

The invention discloses a postharvest pre-cooling method for leaf vegetables. The postharvest pre-cooling method comprises the following steps: (1) picking water-free leaf vegetables, and placing theleaf vegetables in a grading manner according to plant sizes and grades of maturity; (2) putting the leaf vegetables into a low-temperature refrigerator, carrying out frosting at (-2)-0 DEG C for 1-3hours until moisture in the leaf vegetables is adequately frozen; (3) carrying out staged vacuum temperature-varying pre-cooling; (4) putting the pre-cooled leaf vegetables into packaging bags, and filling the packaging bags with fresh gas; (5) stacking the bagged leaf vegetables, putting the bagged leaf vegetables into a pass box, and arranging a wood pulp paper layer between every two layers ofthe packaging bags; and (6) storing the full pass box under a refrigeration condition of 0-4 DEG C. According to the postharvest pre-cooling method, a vacuum pre-cooling link is added into a preliminary working production process chain of a postharvest production place of the leaf vegetables, so that a pre-cooling link is shortened, a storage condition of the processed leaf vegetables can be faster realized, and the problems that the pre-cooling time is too long, field heat cannot be timely removed, and the quality of the leaf vegetables is degraded are avoided.

The invention provides a low-temperature propane ship unloading and heating device and process. The device comprises a ship unloading arm, a pre-cooling unit, a pre-cooling buffering unit, a heating and boosting unit and a tank area spherical tank, wherein the ship unloading arm, the pre-cooling unit, the pre-cooling buffering unit, the heating and boosting unit and the tank area spherical tank are sequentially connected with one another, the pre-cooling buffering unit is connected with a condensate recovery unit, and the heating and boosting unit is connected with a heat exchange unit. The device has the beneficial effects that the whole set of ship unloading and heating device and process comprising a pre-cooling pipeline are designed, the pre-cooling time of a ship unloading pipeline iseffectively shortened through a segmented pre-cooling mode, and the stability and the safety of the pre-cooling process are high; and the heating and boosting unit of low-temperature propane is arranged, the received low-temperature propane can be heated to 10 DEG C-0 DEG C, and low-temperature steel can be replaced conveniently by a common carbon steel material for a spherical tank of a subsequent storage device, so that the investment of the spherical tank equipment is saved.

The invention provides a fresh-keeping device with a good fresh-keeping effect and a control method for the fresh-keeping device. The fresh-keeping device comprises a refrigerating device, a fresh-keeping box, and a heat exchange accelerating mechanism which is arranged in an inner container and used for accelerating the gas flow rate in the inner container. According to the fresh-keeping device with the good fresh-keeping effect and the control method for the fresh-keeping device, a secondary refrigerant is arranged between a shell and the inner container, the influence caused by environmenttemperature fluctuation is avoided through the buffering effect of the secondary refrigerant, then the temperature fluctuation in the inner container is controlled within the range of +/-0.2 DEG C, sothat food spoilage is avoided, the eating quality of food is guaranteed, the storage period of food is prolonged, meanwhile, the gas flow rate in the inner container is increased through the heat exchange accelerating mechanism, thus the heat transfer rate in the inner container is increased, in addition, the heat transfer rate and the heat transfer area are increased through corrugated plates made of metal, the heat transfer rate is further increased, so that the pre-cooling time is greatly shortened, and the fresh-keeping effect of the fresh-keeping device is improved.

The invention discloses a real-time cooling draught beer machine adopting graphite solid heat exchange. The real-time cooling draught beer machine comprises a heat exchange module, a temperature detector, a temperature controller, a fan, a compressor, a heat radiator, a filter and a capillary tube. The heat exchange module comprises a sealing shell, a beer drainage coil pipe, a condensation pipe coil pipe and a temperature inductor. The beer drink coil pipe is fixedly mounted in the sealing shell. The real-time cooling draught beer machine adopting graphite solid heat exchange carries out cooling through a solid efficient heat conducting medium and has the following advantages that 1) a water cooling system is replaced, a water medium does not need to be replaced, and the cost is reduced;2) the cooling efficiency is high, and the cooling amount of beer is increased; 3) the heat exchange rate is increased without stirring cold water, electric energy is saved, and the cost is reduced; 4) a circuit control system of an ice making system is omitted, the problem that ice is not made in time is solved, and the related part cost is reduced; and 5) the solid efficient heat conducting medium is used, so that the product is small in size and low in weight and can be used in the family.

The invention discloses a precooling method for an infiltrative type low-temperature liquid pump. The method comprises the following steps of: (1) preparing two storage tanks between which a pressure difference exists, wherein the storage tanks are connected in series with the infiltrative type low-temperature liquid pump through a pipeline and a valve body arranged on the pipeline respectively; (2) opening the valve, feeding a low-temperature liquid into a low-pressure storage tank from a high-pressure storage tank by the infiltrative type low-temperature liquid pump while precooling the infiltrative type low-temperature liquid pump; and (3) when the temperature of the infiltrative type low-temperature liquid pump falls below a usage temperature according to display of a computer, which indicates that the infiltrative type low-temperature liquid pump is pre-cooled fully and can be put into use, starting the infiltrative type low-temperature liquid pump. Compared with the conventional precooling technology for an infiltrative type low-temperature liquid pump, the precooling method has the advantages that waste caused by precooling of the infiltrative type low-temperature liquid pump through low temperature dissipating liquids (such as substance which are gaseous at the normal temperature including liquefied natural gas and liquefied coal gas) is avoided, the precooling time is shortened, energy and precooling time are saved, the safety coefficient is increased, and the production cost is lowered.

The invention relates to a precooling process of a low-temperature medium pipeline, in particular to a quick precooling method of a low-temperature medium pipeline system. The quick precooling method of the low-temperature medium pipeline system is used for overcoming the defects of long precooling time and lower utilization efficiency of cold energy of a low-temperature medium in the prior art. The quick precooling method of the low-temperature medium pipeline system comprises the following steps of: 1) injecting a low-temperature medium into a low-temperature container; 2) performing early-stage precooling by adopting a high-pressure small-flow mode; 3) performing first-time mode switching; 4) performing middle-stage precooling by adopting a low-pressure large-flow mode; 5) performing second-time mode switching; and 6) performing later-stage precooling by adopting a low-pressure small flow.

The invention discloses a pre-cooling device before filling of a liquid helium storage tank, and relates to the technical field of pre-cooling of liquid helium storage tanks. The pre-cooling device comprises the liquid helium storage container, a throttle valve, a low-temperature pump, a heat exchanger, a compressor, a safety valve, an injection device, a liquid helium storage tank, a densitometer, a one-way valve, a second injection device, a control unit, various stop valves and the like. A method of liquid hydrogen preliminary pre-cooling, helium soaking pre-cooling and liquid helium evaporation pre-cooling is adopted, compared with other pre-cooling devices, cold energy of helium in the liquid helium storage container is fully utilized, the liquid helium consumption is reduced, and the process economic benefits are improved. A helium soaking pre-cooling method is adopted, the liquid helium storage tank is further cooled, residual hydrogen is liquefied and discharged, it is guaranteed that the purity of a product is qualified, meanwhile, a liquid helium evaporation pre-cooling method is adopted, the heat exchange rate of helium and the liquid helium storage tank is increased, and the pre-cooling time is shortened.