3results about How to "Reduce outlet pressure" patented technology

The invention relates to a liquid pressurizing and cold returning type natural gas liquefying device which is characterized in that pure liquid nitrogen, coarse liquefied natural gas or dirty liquid nitrogen generated by a rectifying tower in the natural gas liquefying device enters a main heat exchanger or a cold returning device after being pressurized by a hydraulic pump, and gas generated after heat absorption and gasification in the main heat exchanger or the cold returning device enters a high-pressure expansion machine to do work through expansion; exhaust gas of the high-pressure expansion machine enters the rectifying tower to provide cooling capacity needed by natural gas liquefaction, liquefied natural gas generated by the rectifying tower serves as a product to be output, and nitrogen discharged from the rectifying tower achieves closed-loop circulation through the circulating compressor. The purposes of energy conservation and consumption reduction of the natural gas liquefaction device are achieved through the processes of primary pressurization of the gas compressor, secondary pressurization of the hydraulic pump, cold returning, gasification and expansion.

The embodiment of the present application discloses an anti-surge system for a refrigeration station and a compressor unit, the anti-surge system comprising: a centrifugal compressor comprising a gas outlet; a first gas path for receiving a section of gas, the section of gas being compressed by the centrifugal compressor to form first compressed gas; a second gas path for receiving first supplementary gas, the first supplementary gas being mixed with the first compressed gas and compressed by the centrifugal compressor to form second compressed gas; a third gas path for receiving second supplementary gas, the second supplementary gas being mixed with the second compressed gas and compressed by the centrifugal compressor to form third compressed gas; an exhaust gas path connected to the gas outlet, the exhaust gas path being used for discharging the third compressed gas from the anti-surge system; and an anti-surge gas path selectively connected to the first gas path, the second gas path and the third gas path, the anti-surge gas path being used for feeding the first compressed gas into the first gas path, or feeding the second compressed gas into the second gas path, or feeding the third compressed gas into the third gas path.

This invention relates to the field of gas purification technology and discloses a low-energy desulfurization method: (1) acidic gas and foaming liquid are contacted in a microbubble generator to generate microbubbles, resulting in a gas-liquid mixture; wherein the foaming liquid includes ultrafine particles and complexed iron desulfurization liquid I, the particle size of which is 10-100 μm; (2) the mixture and complexed iron desulfurization liquid II are contacted counter-currently in an absorption tower to undergo an oxidation-reduction reaction, resulting in purified gas and desulfurized rich liquid; (3) the desulfurized rich liquid and air are oxidized and regenerated in an oxidation regeneration tank to obtain regenerated gas, regenerated lean liquid, and regenerated sulfur slurry; (4) the regenerated sulfur slurry is separated in a separator to obtain sulfur and filtrate; the regenerated lean liquid and / or filtrate are returned to the absorption tower for recycling. The low-energy desulfurization method provided in this invention can improve the bubble effect of the microbubble generator, reduce the impact energy consumption of the microbubble generator, improve the mass transfer efficiency of the absorption tower, and help reduce desulfurization energy consumption.