10results about How to "Save compression work" patented technology

The invention provides a dual-temperature refrigerating system, an air conditioning unit and a defrosting control method. The dual-temperature refrigerating system comprises a first compressor and a condenser; the low-temperature loop is provided with a low-temperature evaporator, and the low-temperature evaporator communicates with the first compressor and the condenser; the medium-temperature loop comprises an evaporator branch and a medium-temperature evaporator arranged on the evaporator branch; the medium-temperature evaporator comprises a first evaporator and a second evaporator which are connected in series, and the first evaporator and the second evaporator are arranged on the evaporator branch at an interval; and the controller is used for converting the refrigerant circulation direction between the first evaporator and the second evaporator according to the frosting condition of the first evaporator or the second evaporator so as to defrost the first evaporator or the second evaporator. According to the double-temperature refrigerating system, the technical problems that in the related technology, the cost is increased and the practicability is poor due to the fact that two independent refrigerating systems are adopted in a double-temperature-zone system are solved.

This application discloses a system and method for producing cryogenic cooling capacity based on carbon dioxide, belonging to the field of pipeline transportation technology. The system includes: a multi-stage compressor, a first heat exchanger, an absorption chiller, a regenerator, a second heat exchanger, a booster pump, and an expander. By processing the input room-temperature gaseous carbon dioxide through a series of steps, the system can output cryogenic gaseous carbon dioxide that provides cryogenic cooling capacity for the cryogenic distillation process of carbon dioxide. By using this cryogenic carbon dioxide to replace liquid ammonia as a refrigerant, not only is the problem of the difficulty in obtaining cryogenic cooling capacity in the cryogenic distillation process solved, but the hazards are also reduced, making the refrigeration process more energy-efficient and environmentally friendly.

The application discloses a step-by-step cooling carbon dioxide refrigeration system, which is composed of a compressor, a compression cooler, a re-cooler, a cooler, an evaporator, a throttling device, a working medium pipeline, a cooling pipeline, an adjusting valve, a low-temperature pipeline and a temperature sensor, the compression cooler is in close contact with the outer wall of the compression cavity / cylinder of the compressor, the temperature sensor is arranged on the exhaust pipe of the compressor, the compressor is connected with the cooler, the re-cooler, the throttling device and the evaporator through the working medium pipeline to form a closed refrigeration system, and the closed refrigeration system is filled with proper working medium, the cooling fluid in the cooling pipeline flows through the re-cooler, the compression cooler and the cooler in sequence, the working state of the adjusting valve is controlled by the temperature sensor, and the fluid in the low-temperature pipeline flows through the evaporator, so that the compression process of the carbon dioxide is strengthened by the compression cooler, the cooling process of the carbon dioxide is strengthened by the added re-cooler, and the energy efficiency ratio and the operation reliability of the carbon dioxide refrigeration system are obviously improved.

An embodiment of the present invention provides a supercritical carbon dioxide isothermal compression system, comprising: a compressor having a compression inlet and a compression outlet; a mixer connected to the compressor and communicating with the compression inlet, the mixer being used to mix carbon dioxide and oil; and a separator communicating with the compression outlet, the separator being used to separate the mixture of carbon dioxide and oil. In this supercritical carbon dioxide isothermal compression system, the mixer mixes gaseous supercritical carbon dioxide and liquid oil to form a gas-liquid mixture. This gas-liquid mixture is compressed under the action of the compressor. The gaseous supercritical carbon dioxide generates a large amount of heat of compression during compression, while the liquid oil, with its high specific heat, absorbs the heat of compression generated by the supercritical carbon dioxide, thereby suppressing the temperature rise of the supercritical carbon dioxide during compression, reducing the compression work generated during compression, and reducing the energy consumed during compression.

An internal combustion engine for achieving compression ratio and expansion ratio decoupling is characterized in that the internal combustion engine is composed of an independent compressor and an independent expansion machine, an intercooler and a combustion chamber are arranged between a compressor air cylinder and an expansion machine air cylinder, and the intercooler and the combustion chamber are connected through a pipeline and a valve system. Separation of the compressor from the expander decouples the compression ratio and the expansion ratio, thereby forming a low compression ratio and an ultra-high expansion ratio. For example, when the compression ratio is 10: 1, the expansion ratio can reach 30: 1. In particular, the internal combustion engine has a new combustion mode, which has a strong ability to resist knocking.

The invention relates to the technical field of liquefied air energy storage, in particular to an air purification system and a liquefied air energy storage device. The air purification system comprises a purifier, a heat exchange unit and a booster fan, and the purifier filled with an adsorbent is connected in the air pressurization system in series so as to purify flowing air in the energy storage stage; the heat exchange unit is connected in series between an outlet of the booster fan and a regenerated gas inlet of the purifier, an inlet of the booster fan is communicated to an air emptying pipeline of the expansion power generation system, and the heat exchange unit has a heating function and a cooling function on flowing air. In the energy release power generation stage, the heater can be used for heating air firstly and then cooling the air, so that regeneration hot blowing is carried out on the purifier firstly, and then regeneration cold blowing is carried out. And the cycle period of adsorption and activation is one day, so that the utilization rate of equipment is effectively improved. And meanwhile, regeneration hot blowing and cold blowing are continuously carried out, so that the activation effect is ensured.

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 utility model discloses a synthetic recycle gas methanol washing purification recovery device, which is characterized in that the bottom of a synthetic tower is sequentially connected with an air cooler, a water cooler and a crude methanol separator through pipelines, the tower top of the crude methanol separator is connected with the middle lower part of a methanol washing tower through a pipeline, and the tower bottom is connected with a subsequent rectification unit; the top of the methanol washing tower is connected with a recycle gas compressor through a pipeline, and the recycle gas compressor is connected with a feed gas pipeline entering the synthesis tower through a pipeline. The device disclosed by the utility model realizes high-efficiency purification and recovery of methanol in synthetic recycle gas, and ensures long-period stable operation of the system.