171 results about "Liquefaction of gases" patented technology

Method for gas liquefaction comprising cooling a feed gas by a first refrigeration system in a first heat exchange zone and withdrawing a substantially liquefied stream therefrom, further cooling the substantially liquefied stream by indirect heat exchange with one or more work-expanded refrigerant streams in a second heat exchange zone, and withdrawing therefrom a further cooled, substantially liquefied stream. At least one of the one or more work-expanded refrigerant streams is provided by compressing one or more refrigerant gases to provide a compressed refrigerant stream, cooling all or a portion of the compressed refrigerant stream in a third heat exchange zone to provide a cooled, compressed refrigerant stream, and work expanding the cooled, compressed refrigerant stream to provide one of the one or more work-expanded refrigerant streams. The flow rate of a work-expanded refrigerant stream in the second heat exchange zone typically is less than the total flow rate of one or more work-expanded refrigerant streams in the third heat exchange zone.

A process of stimulating hydrocarbon recovery is described and claimed. This process includes introducing a gas, a liquified gas or a vaporized liquified gas, into an underground formation containing hydrocarbons such as crude oil and gas, permitting said gas to be absorbed by said hydrocarbons, and withdrawing said hydrocarbons containing the gas therein, wherein a pill of Hydrocarbon Recovery Fluid comprising surface functionalized nanoparticles is inserted into the underground formation containing hydrocarbons before, during or after the introduction of the gas, liquified gas or a vaporized liquified gas.

The multiple pressure stage mixed work medium cryogenic throttling refrigeration system consists of several stages of compressor set unit MCPU, back heating pre-cooling unit MRU and evaporator unit EVU. The connection mode includes connecting the high pressure outlet of MCPU to the high pressure inlet of MRU, connecting the low pressure inlet of MCPU to the low pressure outlet one MRU, connecting the high pressure outlet operate MRU to the inlet of EVU, and connecting the outlet of EVU to the low pressure inlet of MRU. The present invention adopts high efficiency multiple-element mixed work medium. The refrigeration system has lowered irreversible loss of compression and back heating process thermodynamically, reduced loss in the practical flow and heat exchange process, and thus high thermodynamic efficiency, and is especially suitable for large and middle scale low temperature refrigerating and gas liquefying fields.

Haze formation in heavy Gas-to-Liquids (GTL) base stock is mitigated by the addition to said GTL base stock of one or more particular additives.

The invention is a process involving membrane-based gas separation for separating and recovering carbon dioxide emissions from combustion processes in partially concentrated form, and then transporting the carbon dioxide and using or storing it in a confined manner without concentrating it to high purity. The process of the invention involves building up the concentration of carbon dioxide in a gas flow loop between the combustion step and a membrane separation step. A portion of the carbon dioxide-enriched gas can then be withdrawn from this loop and transported, without the need to liquefy the gas or otherwise create a high-purity stream, to a destination where it is used or confined, preferably in an environmentally benign manner.

The invention discloses a rectification-type self-overlaying gas liquefying system, which comprises a compressor, a condenser, a rectifying device and a raw material gas liquefying loop. A discharging port of the compressor is connected with a feeding port of the condenser; a discharging port of the condenser is connected with a feeding port in a kettle of the rectifying device; the rectifying device comprises a rectifying tower and a tower top heat exchanger, wherein the tower top heat exchanger is communicated with the top of a rectifying section of the rectifying tower; a discharging port at the top of the tower top heat exchanger is connected with the raw material gas liquefying loop; and the raw material gas passes through the raw material gas liquefying loop and a final liquefying product is obtained. In the invention, a multi-stage separation process of the traditional mixed working medium liquefying system is replaced by the rectifying device, the high-pressure liquids with different components led out from the bottom and the top of the rectifying device are respectively subject to pressure reduction to enter the raw material gas liquefying loop, the change of the water equivalent weight in the temperature-reduction liquefying process is matched in an optimized way so that the raw material gas is cooled section by section. The rectification-type self-overlaying gas liquefying system has the advantages of simple structure, reliability in operation, high system liquefying efficiency and the like, and is particularly suitable for various mini-type and micro-type gas liquefying systems.

A method for generating refrigeration for cooling a product gas wherein a first or working gas undergoes a staged expansion to a first temperature and a subsequent turboexpansion to a second higher temperature and both the expanded gas and the turboexpanded gas provide cooling to the product gas.

The present invention relates to a system and method for improving the liquefaction rate in cryocooler-based cryogen gas liquefiers. The present invention relates to a cryogen-gas liquefaction system(1) and method comprising: a storage container (2) comprising a liquid storage portion (3) and a neck portion (4) with a liquefaction region (8) above said bath (7); a coldhead (9) arranged at the neck portion (4) comprising one or more refrigeration stages (10, 11); a gas intake module (12) containing an amount of gas-phase cryogen for its introduction into the storage container (2); and a pressure control mechanism (13) for controlling the cryogen gas pressure within the liquefaction region (8) of the storage container (2).

The invention belongs to the technical field of heat engines and particularly relates to a low-temperature heat engine device which comprises a control system, a phase change working system, a heat absorber, a compression cooling and depressurization system and a pressurization system, wherein the heat absorber, the phase change working system, the compression cooling and depressurization system and the pressurization system are controlled by the control system and are sequentially connected to form a loop capable of absorbing heat in the environment temperature smaller than 100 DEG C and capable of performing phase change working, and the loop contains mixed dielectric gases. Compared with the prior art, gas phase change working is performed so that output power of the systems is remarkably increased. In the working process of the systems, the gases are liquefied after phase change working so that in the circulating process of the systems, not massive external work is needed to be consumed to liquefy the gases through a compressor. Most consumed matters in the balance exchange process of the pressurization system are cold capacity generated by the dielectric gases in the process. Therefore, output power of the systems is remarkably increased, consumed external work is remarkably reduced, and the low-temperature heat engine device can be achieved completely.

A gas liquefaction process, especially for producing LNG, maintains product flow rate and temperature by controlling the refrigeration so that variation to reduce any difference between actual and required product temperatures is initiated before variation of the product flow rate to reduce any difference between actual and required flow rates.

A design for equipment and process for reliquefaction of LNG boiloff gas, primarily for shipboard installation, has high thermodynamic efficiency and lower capital cost, smaller size (volume, footprint), lower weight, and less need for maintenance than systems utilizing the prior art. The main refrigerant gas compressor is reduced to a single stage turbocompressor. Optional elements include: compression of boiloff gas at ambient temperature; compression of boiloff gas in one or two stages; turboexpansion of refrigerant gas incorporating one or two turboexpanders; turboexpander energy recovery by mechanical loading, compressor drive, or electric generator; refrigerant sidestream for cooling at the lowest temperatures.

The invention discloses a low-entropy mixed combustion gas-liquified substance engine, which comprises an internal combustion engine and a gas-liquified substance storage tank, a combustion chamber of the internal combustion engine is provided with an admission passage and an exhaust passage, the gas-liquified substance storage tank is communicated with the combustion chamber sequentially via a high-pressure liquid pump and a gas-liquified substance control valve, the gas-liquified substance in the gas-liquified substance storage tank enters the combustion chamber in the form of liquid or a critical state or ultrahigh-pressure gas, and after the gas-liquified substance in the gas-liquified substance storage tank and existing gaseous working medium are mixed, the next process is carried out. The low-entropy mixed combustion gas-liquified substance engine disclosed by the invention not only is highly efficient, but also can utilize the gas-liquified substance produced by a valley current or unstable generating system to increase the efficiency of utilizing wind energy, solar energy and water resources.

The invention discloses a charge engine injected with low-entropy mixed-combustion liquefied gas, which comprises a liquefied gas source, a jet pump and a working mechanism. The liquefied gas source is connected with a dynamic fluid jet orifice of the jet pump, and a gas outlet of the jet pump is communicated with a working medium inlet of the working mechanism. The charge engine injected with low-entropy mixed-combustion liquefied gas has high working efficiency and can produce the liquefied gas by making use of valley electricity or an unstable power generation system, so that the utilization efficiencies of wind energy, solar energy and water resources can be improved.