4results about How to "Long suspension time" patented technology

The invention relates to the technical field of coal mine construction, and discloses a protection device for coal seam extraction, which is characterized in that the protection device is arranged on the inner side of the bending part of the L-shaped pipe, and the filtering part comprises a gear ring rotationally connected in the L-shaped pipe and a filter screen fixedly connected to the inner ring of the gear ring and used for intercepting solid particles; the stirring rods are fixedly connected to the outer ring surface of the gear ring at equal intervals and face the incoming flow direction of fluid. Through the arrangement of the L-shaped pipe and the scraping plates, when fluid is input, the flow speed of the fluid is effectively reduced, meanwhile, guiding flowing of the fluid is provided, a better sedimentation environment is provided for the fluid, gas density is low, and gas floats upwards, meanwhile, when the filter screen rotates, the low-position scraping plate generates a scraping effect on the filter screen, and the high-position scraping plate generates effective deformation on the filter screen; and the particles attached in the holes can further fall off, and the fallen particles always fall to an upstream large-particle-size area, so that the degree of abrasion of coarse coal to a subsequent conveying pump body is reduced while effective separation is realized.

This invention belongs to the field of oil and gas field development technology and discloses a temperature-pH dual-responsive smart fracturing proppant and its preparation method. The proppant adopts a three-layer core-shell structure, including a high-strength ceramic or quartz sand core, a polyvinyl alcohol crosslinking transition layer reinforced with nano-silica, and a poly(N-isopropylacrylamide-co-acrylic acid) copolymer smart response layer. In the low-temperature proppant carrying stage, the smart response layer hydrates and swells to form a gel layer, giving the proppant excellent suspension performance and friction reduction ability, realizing water fracturing. In the high-temperature reservoir environment, the phase transformation of the temperature-sensitive segment and the protonation of the pH-sensitive segment cause the smart response layer to shrink and detach rapidly, realizing autonomous gel breaking and aiding in fracturing. The nano-reinforced transition layer significantly improves the anti-fracture performance, reducing the fracture rate to 6% to 11% and increasing the long-term conductivity by 35% to 58%.

The utility model discloses a farm with omni -directional adjustable cloud and mist machine, including remote control mobile chassis, water storage unit, fluid pressure increasing device and two groups of symmetrical spray mechanism. Spray mechanism contains: fixed bottom cylinder is hinged with chassis through linear actuator and realizes basic pitch adjustment, coaxial sleeve joint's pitch adjustment cylinder connects universal hinged frame, double cylinder hinged fixed bottom cylinder and universal hinged frame drive -45 to + 80 pitch angle adjustment, airflow acceleration air cylinder is hinged universal hinged frame and realizes that + 180 rotates, turbine fan is integrated in the air cylinder air inlet end and produces 12m / s airflow, annular spray manifold is fixed in the air outlet, and the periphery is evenly distributed high pressure atomizing nozzle, and its spray axis and air cylinder center present 15 - 45 out of the inclination angle. The equipment realizes three -dimensional accurate positioning, produces 80 - 120mu m suspended cloud and mist, and the coverage reaches 98%, effectively solves piglet breeding disinfection avoidance and pathogenic dead angle clearance problem.

This invention relates to the field of nano-calcium carbonate preparation technology, specifically to a double-layer reciprocating reactor, nano-calcium carbonate, and a preparation method. The reactor includes a shell and an inner rotor, an outer rotor, and a spray pipe disposed within the shell. The inner and outer rotors are coaxially and rotatably disposed outside the spray pipe, and their rotation directions are opposite. The method involves reacting a Ca(OH)₂ suspension with CO₂ in the reactor to generate nano-calcium carbonate particles in a single reaction, with a single-reaction yield of 20%–30%. Subsequently, the reaction is completed in an aging tank to obtain a carbonized slurry. The carbonized slurry is then post-treated to obtain the finished nano-calcium carbonate product. This nano-calcium carbonate is prepared by this method. This invention can improve the yield of nano-calcium carbonate seed crystals generated from a single reaction of Ca(OH)₂ suspension and CO₂, ensuring a uniform particle size distribution in the nano-calcium carbonate product.