31results about How to "Improve pre-cooling efficiency" patented technology

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 discloses a multifunctional low-temperature scroll plate pre-cooling heat exchanger. The multifunctional low-temperature scroll plate pre-cooling heat exchanger includes an intermediateslit structure, a threaded hole, a spiral groove, a U-shaped groove, a fixing hole and a temperature measuring and heating threaded hole. The heat exchanger is applied to a pre-cooling unit of a pre-cooling type JT refrigerator for a liquid helium temperature zone and a room temperature zone. The heat exchanger can not only directly replace a cold head of a pre-cooler, but also can be used as a supporting bottom plate of a cold screen. The intermediate slit structure increases the heat exchange area, so that the pre-cooling efficiency is greatly improved. The spiral groove is in interference fit with a high-pressure pipeline to pre-cool high-pressure and high-temperature helium. The surface of the heat exchanger is plated with a micron-level thin gold layer to reduce radiation leakage heatloss. The U-shaped groove facilitates the arrangement of pipelines and wires, and can further be used as heat sink of the wires from the liquid helium temperature zone to the room temperature zone. The multiple functions of the cold head of the pre-cooler, the support of the cold screen, the pre-cooling of high-pressure fluid and the heat sink of the wires are integrated, the structure is compact, the contact thermal resistance between the pre-cooler and the heat exchanger is reduced, the pre-cooling effect of a refrigerator is enhanced, and the pre-cooling efficiency is improved.

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 present invention discloses a gradient pre-cooling method suitable for red globe grapes. An orthogonal experiment method is used to optimize processes, and pre-cooling efficiency is improved by atwo-stage gradient differential pressure pre-cooling method. Wind temperature is -3 DEG C and differential pressure wind speed is 1.0 m/s in a rapid pre-cooling stage, and a center temperature of grape fruit granules is pre-cooled to 3 DEG C. The differential pressure effect is even, an interaction between the differential pressure pre-cooling wind temperature and wind speed is obvious, a coolingrate can be increased by 1.23-1.75 times; no cold damage occurs in the pre-cooling period, and green color fading and dry shrinkage of ear stalks and fruit stalks are not obvious in the pre-cooling period; and temperature fluctuations of the fruit ears of the red globe grapes are small, and respiratory intensity and humidity fluctuations are relatively stable in the pre-cooling treatment. The gradient pre-cooling method solves a problem that the red globe grapes are easy to rot caused by improper pro-cooling preservation after the red globe grapes are picked, and has wide practicality and development value in the field of preservation of fruits and vegetables.

The invention relates to a high-pressure vacuum sandwich pipeline, and the problems of resource waste and safety risk caused by a vacuum interlayer pipeline are solved. The high-pressure vacuum sandwich pipeline comprises an inner-layer conveying pipe, intermediate pre-cooling pipes, external vacuum heat insulation pipes, first supporting frames, first flexible connecting assemblies and second flexible connecting assemblies, wherein pre-cooling medium is arranged in the intermediate pre-cooling pipes; the inner-layer conveying pipe, the intermediate pre-cooling pipes and the external vacuum heat insulation pipes are sequentially arranged from inside to outside and are coaxial, the plurality of external vacuum heat insulation pipes are connected through the first flexible connection assemblies, and the plurality of intermediate pre-cooling pipes are connected through second flexible connecting assemblies; the first supporting frames are multiple, a plurality of first supporting frames are arranged between the intermediate pre-cooling pipes and the inner-layer conveying pipe and are provided with overflowing holes; a heat bridge is arranged at the two ends of the external vacuum heatinsulation pipes, and the heat bridge is of a multi-layer snake-shaped pipe structure; and a vacuumizing connector is arranged on the external vacuum heat insulation pipes, and molecular sieve filling cavities are formed in an inner cavity and are used for filling molecular sieves.

The invention discloses an intelligent agricultural product differential pressure precooling system adopting ice slurry. The interior of the refrigeration house is divided into an air inlet area, a pre-cooling area and an air return area through a vertical partition and a transverse partition. An air inlet of the heat exchanger is communicated with the lower portion of the air return area, an air outlet of the heat exchanger is connected with the air cooler, and the ice slurry generator is connected with the heat exchanger through a pipeline. And a plurality of exhaust fans are embedded on the vertical partition of the air return area to form pressure difference. A goods shelf and a pre-cooling box are arranged in the pre-cooling area, and a temperature sensor and a humidity sensor are arranged in the pre-cooling area. And the temperature sensor, the humidity sensor, the ice slurry generator and the air cooler are connected with the control device. The air pumped into the air return area still has certain moisture and low temperature, is not directly discharged to the outside, but enters the heat exchanger for circulating heat exchange, and the problem of water loss in the traditional differential pressure precooling process is effectively solved. The problem that an existing pressure difference pre-cooling technology cannot be automatically and intelligently adjusted is solved, and the refrigeration efficiency is improved.

The invention discloses a liquefied natural gas pre-cooling device. The liquefied natural gas pre-cooling device structurally comprises a gas inlet pipe, an anti-static pre-cooling device, a controller, a protector, a pressure gauge and a liquid discharge pipe; and the left end of the gas inlet pipe is welded with the right upper part of the anti-static pre-cooling device, the left surface of theanti-static pre-cooling device is attached to the right surface of the controller and is fixed through screws, and the protector is arranged below the controller and is electrically connected to the controller through wires. According to device, the anti-static pre-cooling device comprises a gas flow driving device, a transmission mechanism, a uniform cooling device, a rapid condensation device, aliquid flow starting device, a timing rotating mechanism and an anti-static device; and when liquefied natural gas is pre-cooled, the pre-cooling of the liquefied natural gas can be more uniform, thepre-cooling efficiency is improved, static electricity generated by friction between the liquefied natural gas and the inner wall of the device can be led outside, sparks are prevented from being generated inside the device, so that the safety capability is improved.

The invention relates to an efficient pre-cooling and liquefying system of a coupling expansion mechanism and a regenerative refrigerating machine. The efficient pre-cooling and liquefying system comprises a regenerative refrigerating module, an expansion and compression module and a pre-cooling and liquefying module. The regenerative refrigeration module comprises a regenerative refrigerator unit and a direct-current external circulation unit; the regenerative refrigerator unit comprises a compressor device, a regenerator and a cold end heat exchanger which are connected in sequence; in the direct-current external circulation unit, direct current is led out of the refrigerator unit from any position, passes through a plurality of channels and then returns to the heat regenerator, and direct-current circulation is completed. And a direct-current control valve is arranged in the direct-current external circulation unit so as to control the direct-current flow. Compared with the prior art, the direct current led out is subjected to expansion depressurization, the expansion refrigeration effect is improved, the pressure similar to that of the to-be-precooled material is obtained, the specific heat capacity of the to-be-precooled material is similar, more to-be-precooled materials can be precooled and liquefied through the equivalent led-out direct current, and therefore the precooling and liquefying efficiency is improved.

The invention discloses a primary throttling low-temperature refrigeration system pre-cooled by utilizing the vortex tube energy separation effect. The system comprises a compressor, heat regenerators, a throttling valve and an evaporator, and is characterized in that the heat regenerator comprises a first heat regenerator and a second heat regenerator; the system further comprises a three-way flow regulating valve and a vortex tube; an outlet of the compressor communicates with an inlet of the three-way flow regulating valve, a first outlet of the three-way flow regulating valve communicateswith a hot end inlet of the first heat regenerator, and a second outlet of the three-way flow regulating valve communicates with an inlet of the vortex tube; a cold end outlet of the vortex tube and ahot end outlet of the second heat regenerator are combined into one path to communicate with a cold end inlet of the first heat regenerator; and a hot end outlet of the first heat regenerator communicates with an inlet of the compressor. The primary throttling low-temperature refrigeration system pre-cooled by utilizing the vortex tube energy separation effect has the advantages that structure issimple, internal pre-cooling can be adopted, and the refrigerating efficiency is high.

The present invention discloses a novel cold air flow vortex type differential pressure pre-cooling device. The novel cold air flow vortex type differential pressure pre-cooling device consists of a condensing unit, a pre-cooling room, a ventilation system and a control system; the pre-cooling room is composed of a device room and an agricultural product processing room; the pre-cooling room is successively provided with a fin tube evaporator containing a cold air machine, the ventilation system and the agricultural product processing room; the enclosure structure of the device room is polyurethane insulation boards; an outlet of the condensing unit is connected with an inlet of the fin tube evaporator containing the cold air machine via an arranged electronic expansion valve; and an outlet of the fin tube evaporator containing the cold air machine is connected with an inlet of the condensing unit. The novel cold air flow vortex type differential pressure pre-cooling device is based onan air jet technology and an airflow vortex effect, combines a unique air inlet eccentric structure design, enables cold air flow to conduct a reverse vortex motion, forms a central low pressure zone, improves pre-cooling pressure difference on both sides of products and further enhances the pre-cooling effect.

The invention relates to a cooling device, in particular to a pre-cooling device of concrete aggregate. The pre-cooling device of the concrete aggregate enables aggregate to move, can increase gaps among the aggregate and improve the pre-cooling efficiency. The pre-cooling device of the concrete aggregate comprises a base, a feeding pipeline, a rotating mechanism and a pressurizing mechanism, wherein the two sides of the upper side of the base are both connected with mounting frames, the side, close to the mounting frame on one side, of the base is connected with the feeding pipeline, the rotating mechanism is mounted between the mounting frame and the feeding pipeline, the pressurizing mechanism is mounted on the base, and the pressurizing mechanism is in transmission connection with the rotating mechanism. The aggregate can be rotated and moved rightwards through the rotating mechanism, so that the purposes of moving the aggregate and increasing the gaps among the aggregate are achieved; cold water can be sprayed onto the aggregate through cooperation of the pressurizing mechanism and a water spraying structure, then the aggregate can be pre-cooled, and the pre-cooling efficiency can be improved.

The invention provides an aggregate precooling system. The aggregate precooling system comprises a cooling building, a precooling part, a conveying part, a plurality of discharging parts. The precooling part is fixed on the cooling building and comprises a plurality of aggregate precooling bins. The conveying part comprises a sliding part slidably arranged on the cooling building, and after the sliding part slides and communicates with one aggregate precooling bin, aggregate is conveyed into the aggregate precooling bin. The discharging parts correspond to the aggregate precooling bins one toone. The problem that an existing aggregate precooling effect is poor is solved. According to the aggregate precooling system, through mutual cooperation of the conveying part, the precooling part andthe discharging parts, automatic aggregate precooling is achieved, the labor cost is reduced, the aggregate precooling efficiency is improved, the construction period is shortened, and the productioncost is reduced. The aggregate precooling bins increase the contact time and the contact area of aggregate and precooling liquid, the precooling effect is improved, part of the aggregate is graduallyimmersed by the precooling liquid along with continuous adding of the pre-cooling liquid, and the precooling effect is effectively improved.