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Air separation device and method utilizing LNG cold energy

An air separation device and cold energy technology, applied in the field of air separation, can solve the problems of low cascade utilization efficiency, waste of compression heat of raw material air compressors, etc., and achieve good economic benefits and emission reduction benefits, and reduce unit energy consumption and save energy. The effect of equipment investment

Active Publication Date: 2020-01-17
SUZHOU XINGLU AIR SEPARATION PLANT SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the invention patent CN101943512B and other documents disclose the air separation method using the cold energy of liquefied natural gas. Although these methods use shallow cooling NG to cool the air compressor intercooler, final stage cooler, air compressor and low-temperature nitrogen compressor oil The coolant ethylene glycol aqueous solution of the cooler and the motor realizes the cascade utilization of cold energy, but the cascade utilization efficiency is not high, and the compression heat of the raw material air compressor is also wasted

Method used

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  • Air separation device and method utilizing LNG cold energy
  • Air separation device and method utilizing LNG cold energy
  • Air separation device and method utilizing LNG cold energy

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Effect test

Embodiment 1

[0020] Embodiment 1: An air separation plant utilizing LNG cold energy capable of generating electricity at the same time, including an air compression purification system A, a large cold box system B, a small cold box system C, a refrigerant circulation system D and a coolant circulation system E.

[0021] The air compression and purification system A is used to compress and purify the raw air, which includes a raw air compressor 1 , a raw air cooler 2 and a purifier 3 arranged in sequence. The feed air cooler 2 includes an intercooler and a final cooler. Refrigerant is used as the refrigerant in the feed air cooler 2 .

[0022] The large cold box system B is used to rectify the compressed and purified raw material air 102 to obtain air separation products. The large cold box system B includes a main heat exchanger 5 and a rectification tower system arranged in sequence, and the rectification tower system includes an upper tower 8, a lower tower 10, a main condensation evapo...

Embodiment 2

[0034] Embodiment two: as attached figure 2 As shown, an air separation method and device utilizing cold energy of LNG capable of power generation at the same time, the main difference from Embodiment 1 is that the upper tower 8 mainly produces gaseous oxygen 112 rather than liquid oxygen 105 . A part of the deoxygenated liquefier 14 after throttling the liquid nitrogen 206 from the small cold box system C liquefies and supercools the gas oxygen 112 drawn from the bottom of the upper tower to make it a liquid oxygen product.

[0035] The low-temperature and low-pressure nitrogen compressor 15 can also be omitted, and the liquid nitrogen output of the device will decrease at this time, and the path of the low-temperature and low-pressure nitrogen 110 can also be canceled accordingly.

Embodiment 3

[0036] Embodiment three: as attached image 3 As shown, a kind of air separation method and device utilizing LNG cold energy that can pressurize low-temperature and low-pressure nitrogen to the pressure required by the process at the same time, its main difference from Embodiment 1 is: low-temperature and low-pressure nitrogen 110 is pressurized and permeated with refrigerant Flat expansion unit, that is, two parallel refrigerant supercharging turboexpanders 24, 25 are compressed in series at the supercharging end to make it reach the pressure required by the process. The expansion ends of the refrigerant supercharging turboexpansion units 24 and 25 are connected in parallel, and the boosting ends are connected in series. The refrigerant 401 that exits the heat exchanger 2 is divided into three routes: one route goes to the booster turbo expander 24, the other route goes to the booster turbo expander 25, and the rest of the refrigerant is throttled and combined with the booste...

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Abstract

The invention relates to an air separation device utilizing LNG cold energy. The device comprises an air compression purification system for compressing and purifying raw material air, a large cold box system for rectifying the compressed and purified raw material air to obtain an air separation product, a small cold box system for realizing heat exchange between LNG and nitrogen for providing cold energy for the large cold box system, a refrigerant circulation system utilizing liquefied natural gas cold energy of the small cold box system and a coolant circulation system using the natural gascold energy of the refrigerant circulation system. According to the air separation device and method utilizing the LNG cold energy, the cold energy of the liquefied natural gas can be better utilized, the unit energy consumption of the liquid air separation product is further reduced, the equipment investment can be saved, and better economic benefits and emission reduction benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of air separation, and in particular relates to an air separation device and method utilizing LNG cold energy. Background technique [0002] In the prior art, LNG is often used to provide cold energy for the air separation unit, but there is currently a problem of insufficient utilization of LNG cold energy. For example, the invention patent CN101943512B and other documents disclose the air separation method using the cold energy of liquefied natural gas. Although these methods use shallow cooling NG to cool the air compressor intercooler, final cooler, air compressor and low-temperature nitrogen compressor oil The coolant ethylene glycol aqueous solution of the cooler and the motor realizes the cascade utilization of cold energy, but this cascade utilization efficiency is not high, and the compression heat of the raw material air compressor is also wasted. Therefore, it is necessary to improve the existing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/04
CPCF25J3/04018F25J3/04187F25J3/04612F25J2210/40F25J3/04157F25J2270/904F25J2210/62F25J2250/20F25J3/04224F25J3/04272F25J3/0406F25J3/04351F25J3/04412F25J3/0489F25J3/0403F25J3/04115F25J2250/42F25J2250/50F25J2230/06
Inventor 薛鲁江楚标贾盛兰孙宁
Owner SUZHOU XINGLU AIR SEPARATION PLANT SCI & TECH DEV CO LTD
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