12results about How to "Improve thermodynamic performance" patented technology

The invention provides bio-based epoxy resin based on 4-propyl guaiacol as well as preparation, degradation and reprocessing methods and application of the bio-based epoxy resin, and relates to the technical field of epoxy resin. The bio-based epoxy resin based on the 4-propyl guaiacol, provided by the invention, is prepared from the following raw materials: a 4-propyl guaiacol epoxy monomer and a curing agent; the curing agent contains amino groups and / or disulfide bonds. The bio-based epoxy resin based on 4-propyl guaiacol provided by the invention has the characteristic of being capable of being reprocessed for multiple times, and can keep the integrity of a chemical structure and the stability of thermodynamic properties after being reprocessed for multiple times. The bio-based epoxy resin based on the 4-propyl guaiacol can complete repair of surface scratches under the action of small pressure, can be chemically degraded easily in an N, N-dimethylformamide-solvent system, is convenient to degrade and recycle, and reduces pollution and damage to the ecological environment.

The invention relates to the technical field of polyvinyl chloride, and discloses isosorbide ester grafted bentonite modified polyvinyl chloride, which is prepared by the following steps: carrying out an epoxy ring-opening reaction on epoxy modified bentonite and 11-aminoundecanoic acid, carrying out an esterification reaction on amino acid modified bentonite and isosorbide laurate to obtain isosorbide ester grafted bentonite, and carrying out a reaction on the isosorbide ester grafted bentonite and the isosorbide ester grafted bentonite to obtain the isosorbide ester grafted bentonite modified polyvinyl chloride. According to the present invention, the nano-bentonite is grafted with the isosorbide, such that the agglomeration of the nano-bentonite is effectively avoided, the nano-bentonite is uniformly dispersed in the polyvinyl chloride matrix so as to form the network structure, the stress effect is eliminated under the action of the external force, the isosorbide has characteristics of excellent thermal stability, excellent biocompatibility and excellent degradability, and the flexible long chain is introduced after the grafting so as to improve the toughness of the matrix; according to the present invention, the contained cyclic group can produce the interaction force with the hydrogen atom in the polyvinyl chloride matrix, such that the free volume between the polymer molecules is increased, the mechanical property of the matrix is effectively improved, and the toughness is substantially improved.

The present application relates to a glass mixture and a preparation method thereof, and a glass product. The method comprises the following steps: providing raw materials to obtain a batch material; the raw materials include, by mass percentage, SiO2: 56% to 62%, Al2O3: 11% to 15%, Na2O: 10% to 14%, K2O: 3% to 8%, MgO: 2% to 7%, SnO2: 0 to 1%, and CeO2: 0 to 1%; mixing and granulating the batch material to obtain a mixed granular material; molding the mixed granular material to obtain a molded granular material; pre-decomposing the molded granular material, the pre-decomposing treatment includes sequentially performing a preheating treatment, a pre-decomposing treatment, and a cooling treatment to prepare a glass mixture; wherein the temperature of the preheating treatment is 100°C to 500°C, and the temperature of the pre-decomposing treatment is 600°C to 1000°C.

This invention discloses a combined cooling, heating, and power (CCHP) system, relating to the field of solar energy utilization technology. It includes an energy storage medium, a heat collection subsystem, a supercritical organic Rankine cycle (SOCCR) subsystem, and a refrigeration subsystem. The SOCCR subsystem can output electricity and heat load; the refrigeration subsystem can output cooling load. The energy storage medium can be heated in the heat collection subsystem. Energy storage medium leaving the heat collection subsystem can enter the SOCCR subsystem, providing a first driving heat energy for the SOCCR subsystem's output of electricity and heat load. Energy storage medium leaving the SOCCR subsystem can enter the refrigeration subsystem, providing a second driving heat energy for the refrigeration subsystem's output of cooling load. This invention can improve energy conversion efficiency.

A self-cascade refrigeration system and control method based on vortex tube regulation of working fluid composition and flow rate are disclosed. The self-cascade refrigeration system includes a compressor, condenser, vortex tube, electronic expansion valve, solenoid valve, cascade heat exchanger, evaporator, control device, and temperature and pressure sensors. The control device collects signals from the compressor outlet pressure and temperature sensors, condenser outlet temperature sensor, vortex tube liquid phase outlet pressure sensor, vortex tube hot end outlet temperature sensor, and condenser outlet temperature sensor. It regulates the vortex tube hot end outlet regulating valve, electronic expansion valve, and control solenoid valve. During operation of the self-cascade refrigeration system, the regulating valve of the vortex tube adjusts the refrigerant flow rate in the evaporator, and the vortex tube outlet pressure changes the concentration of mixed working fluid components in the evaporator. By changing the refrigerant flow rate and mixed working fluid component concentration during operation, the safe and efficient operation of the refrigeration system is ensured, and the system's thermodynamic performance is significantly improved.

This invention discloses a carbon dioxide sequestration method and sequestration system. The sequestration method includes the following steps: (1) injecting an aqueous solution of 1,3-dioxolane into a target geological area; (2) injecting the gas to be sequestrated into the target geological area, generating carbon dioxide hydrate through a reaction. The sequestration system includes a monitoring unit, a delivery unit, and a hydration reaction unit; the delivery unit and the hydration reaction unit are connected; the delivery unit includes a horizontal injection well and a horizontal gas injection well; the monitoring unit includes a horizontal monitoring well. The carbon dioxide sequestration method and sequestration system provided by this invention utilize the thermodynamic and kinetic dual promoter 1,3-dioxolane to achieve carbon dioxide sequestration in large-scale scenarios, realizing efficient, rapid, and environmentally friendly CO2 geological sequestration.

Helium at an outlet of a helium liquefaction low-temperature compressor unit is pre-cooled through a mechanical low-temperature pre-cooling cycle of a second heat exchanger and subjected to heat exchange through a third heat exchanger, enters a second electromagnetic three-way valve and is divided into two parts, one part enters a rear four-stage heat exchanger to be cooled, and the other part enters a rear four-stage heat exchanger to be cooled. A helium saturated gas-liquid mixture is generated through throttling of a helium throttling valve and enters a liquid helium Dewar, and gas generated in the liquid helium Dewar and another part of cold helium entering the second-stage turbo expander for adiabatic expansion refrigeration are converged at a third electromagnetic three-way valve along a backflow pipeline; and the helium gas flows back to the first electromagnetic three-way valve and converges with the helium gas source precooled by the mechanical low-temperature precooling circulation to enter the helium liquefaction low-temperature compressor unit, so that the helium liquefaction circulation is completed. Helium at the inlet of the helium liquefaction low-temperature compressor unit is pre-cooled through the mechanical low-temperature pre-cooling circulation, the compression work is reduced through low-temperature compression, and the system efficiency is improved; and the compressor adopts an oil-free gas suspension centrifugal compressor, so that the harm of oil pollution and oil freezing blockage is avoided.

According to the hydrogen liquefaction low-temperature circulating system, hydrogen at an outlet of a hydrogen liquefaction low-temperature compressor unit is pre-cooled through a mechanical low-temperature pre-cooling cycle and subjected to ortho-secondary conversion heat exchange through a third heat exchanger, enters a second electromagnetic three-way valve and is divided into two parts, one part enters a back four-stage heat exchanger for ortho-secondary conversion heat exchange, and the other part enters a back four-stage heat exchanger for ortho-secondary conversion heat exchange; a saturated gas-liquid mixture of hydrogen generated by a hydrogen throttle valve enters a liquid hydrogen Dewar, and gas generated in the liquid hydrogen Dewar and another part of cold hydrogen entering a four-stage turbo expander for adiabatic expansion refrigeration are converged at a third electromagnetic three-way valve along a return pipe; and the hydrogen flows back to the first electromagnetic three-way valve and is converged with the hydrogen source precooled by the mechanical low-temperature precooling cycle to enter the hydrogen liquefaction low-temperature compressor unit, so that the hydrogen liquefaction cycle is completed. Hydrogen at an inlet of the hydrogen liquefaction low-temperature compressor unit is pre-cooled through the mechanical low-temperature pre-cooling circulation, and the compression work is reduced through low-temperature compression, so that the system efficiency is improved; the compressor is an oil-free gas suspension centrifugal compressor, oil removal and oil return are not needed, and the reliability of the system is improved.

The present invention proposes a helium liquefied hydrogen device and method, wherein hydrogen passes through a first-stage heat exchanger and a mechanical low-temperature precooling cycle and a helium circulation precooling, undergoes positive-parallel conversion through the second, third, fourth and fifth heat exchangers, and exchanges heat with the cold helium coming out of the second turbine expander in the helium circulation, and enters the liquid hydrogen throttle valve for throttling, and the generated liquid hydrogen enters the liquid storage tank to complete the hydrogen liquefaction process. The present invention allows the helium entering and exiting the helium circulation cryogenic compressor unit to undergo mechanical low-temperature precooling, the helium is cryogenically compressed to reduce the compression work, and the turbine expander recovers the expansion work, thereby improving the thermodynamic efficiency of the system; the hydrogen liquefaction system only relies on the cold amount provided by the helium circulation system and the mechanical low-temperature precooling cycle, and can complete the liquefaction of hydrogen without compression, thereby improving the safety of the system; the helium circulation cryogenic compressor unit and the mechanical low-temperature compressor both use oil-free gas suspension centrifugal compressors, thereby avoiding the problems of oil removal and oil return, and the reliability is significantly improved.

The application discloses a hydrogen injection strategy optimization method for a dual-fuel X-type rotor engine, obtains geometric parameters of the X-type rotor engine, establishes a CDF fluid simulation model of a dual-fuel X-type rotor engine with gasoline intake port premixing and hydrogen in-cylinder direct injection, determines engine ignition parameters and operating conditions of a single hydrogen injection strategy, and obtains, through simulation calculation, a hydrogen injection time point at which a hydrogen distribution area is maximum and a hydrogen injection time point at which a flame front area is maximum. Under the condition that the hydrogen injection total amount at the two hydrogen injection time points is the same as that of the single hydrogen injection strategy and the hydrogen injection mass fraction at the two hydrogen injection time points is taken as a variable, the hydrogen injection mass fraction corresponding to the hydrogen injection time point at which the hydrogen distribution area is maximum and the hydrogen injection mass fraction corresponding to the hydrogen injection time point at which the flame front area is maximum are obtained through simulation calculation, an optimal two-stage hydrogen direct injection strategy of the dual-fuel X-type rotor engine is obtained, and the thermal efficiency and emission performance of the rotor engine are improved.

The invention relates to a mixed refrigerant, a composition, a refrigerating system and refrigerating equipment, and belongs to the technical field of refrigerants, the mixed refrigerant comprises a first component, a second component and a third component; wherein the first component comprises 3, 3, 3-trifluoropropyne, the second component comprises trans-1, 2-difluoroethylene, and the third component comprises at least one of dimethyl ether and trans-1, 3, 3, 3-tetrafluoropropene. According to the mixed refrigerant, the GWP is smaller than 10, the ODP value (ozone consumption potential value) is 0, the obvious environmental protection advantage is achieved, meanwhile, the performance coefficient of the mixed refrigerant is close to that of R134a, the refrigerating capacity per unit volume is equal to or even better than that of R134a, the temperature slip is smaller than 5 DEG C, and R134a can be well and directly replaced.

The invention discloses a preparation method of polyimide molding powder with a recyclable solvent, and belongs to the technical field of high polymer material synthesis. The preparation method comprises the following steps: adding dianhydride and diamine into a polar aprotic solvent, and carrying out condensation polymerization to generate polyamide acid; the preparation method comprises the following steps: heating polyamide acid under a vacuum condition to carry out imidization to obtain a solid-liquid mixture, separating, washing the separated solid, carrying out heat treatment to obtain polyimide molding powder, and recycling the separated filtrate as a polar aprotic solvent. Compared with a normal-pressure water-carrying system method in which methylbenzene, xylene and other aromatic solvents are used, the reduced-pressure azeotropic dehydration method ensures that an azeotropic system is formed by a polar aprotic solvent and water, moisture in the system is fully removed, anhydride hydrolysis caused by the fact that the recycled solvent contains moisture is avoided, and the yield of the product is improved. Therefore, the problems that the imidization degree is low during cyclization and the thermodynamic property is reduced are solved.