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

A throttling low-temperature refrigeration system for precooling using the energy separation effect of a vortex tube, comprising a compressor, a regenerator, a throttle valve and an evaporator, characterized in that the regenerator includes a first regenerator and a second regenerator The heater also includes a three-way flow regulating valve and a vortex tube, the outlet of the compressor is connected with the inlet of the three-way flow regulating valve, and the first outlet of the three-way flow regulating valve is connected with the hot end inlet of the first regenerator , the second outlet is connected with the inlet of the vortex tube, the outlet of the cold end of the vortex tube is merged with the outlet of the hot end of the second regenerator, and then connected with the inlet of the cold end of the first regenerator, the first regenerator The outlet of the hot end of the compressor is connected with the inlet of the compressor. The one-throttle low-temperature refrigeration system precooled by the energy separation effect of the vortex tube has a simple structure, can adopt internal precooling, and has high refrigeration efficiency.

The invention discloses a liquid nitrogen fracturing process method. The method comprises the steps that replacing accumulated fluid in a well to the ground from a fracturing pipe column; at the position higher than a reservoir to be fractured by the reserved distance, packing an annulus into an upper annulus and a lower annulus; blocking the bottom of the fracturing pipe column and the well bottom, and meanwhile enabling the fracturing pipe column to communicate with the lower annulus; opening the upper annulus for pressure relief, obtaining pressure in the fracturing pipe column, and after confirming that the upper annulus and the lower annulus are packed, opening the fracturing pipe column for pressure relief; blocking the bottom of the fracturing pipe column; under the condition of opening the pressuring pipe column, lowering a flow guide pipe from the fracturing pipe column, and pumping and injecting liquid nitrogen into the fracturing pipe column through the flow guide pipe untilthe interior of the fracturing pipe column is full of the liquid nitrogen, and achieving precooling of the fracturing pipe column; communicating a liquid nitrogen injection device with the fracturingpipe column, and pumping and injecting the liquid nitrogen; and when the fracturing pipe column communicates with a perforation segment, increasing the displacement to carry out fracturing. It can beensured that the low-temperature liquid nitrogen has the higher conveying efficiency and better heat preservation effect.

The invention relates to a movable type differential pressure precooling device. The movable type differential pressure precooling device comprises a controller and a square box body, wherein self-locking mobile wheels are arranged at the bottom of the box body; a goods feed inlet and a goods discharge outlet are formed in the side walls of the box body; square refrigeration units are arranged in the center of the inside of the box body; a square transfer channel encircling the refrigeration units for a circle is arranged between the side walls of the refrigeration units and the side walls of the box body; transfer direction conversion units are arranged at the four corners of the transfer channel correspondingly; cold wind outlets distributed vertically are formed in the four side walls of each refrigeration unit correspondingly; and a cooling capacity adjust and control cover plate is arranged outside each cold wind outlet. The movable type differential pressure precooling device has the beneficial effects of improving precooling efficiency and precooling quality, facilitating the achievement of unattended and refined management, prolonging the preservation time of fresh fruits and vegetables, mushrooms and other agricultural products, improving product quality and quality safety, reducing labor cost, and having good economical benefits and promotion value.

The invention provides an automatic pre-cooling system and a pre-cooling method for LNG storage tanks based on high-efficiency communication. The CFD numerical simulation module is used to simulate the pre-cooling process and provide initial flow parameters for the pre-cooling process; the storage tank is installed and monitored in a modular manner. Points, using 5G technology to realize the signal transmission between each sensor in the pre-cooling system and the integrated operation platform; the present invention is based on the integrated operation platform to limit the temperature drop rate, thermal stress, temperature difference between two adjacent points, inner tank pressure and other parameters The monitoring results are compared and analyzed with the limit value, and then the electric control valve module and the frequency conversion pump module are automatically adjusted to realize the adjustment of the delivery flow of the pre-cooling medium and ensure the stable and safe pre-cooling process. The invention can realize automatic, integrated and integrated control of the pre-cooling process, without long-term arrangement of monitoring personnel at the monitoring point, avoiding potential safety hazards, saving manpower and material resources, more precise pre-cooling control, and high pre-cooling efficiency.