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A kind of air separation device and method utilizing 1ng 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: 2022-07-12
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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  • A kind of air separation device and method utilizing 1ng cold energy
  • A kind of air separation device and method utilizing 1ng cold energy
  • A kind of air separation device and method utilizing 1ng cold energy

Examples

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Effect test

Embodiment 1

[0020] Embodiment 1: An air separation plant using LNG cold energy that can generate 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, and includes a raw air compressor 1 , a raw air cooler 2 and a purifier 3 which are arranged in sequence. The raw air cooler 2 includes an intercooler and a final cooler. In the raw material air cooler 2, a refrigerant is used as a refrigerant.

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

Embodiment 2

[0034] Example 2: as attached figure 2 As shown, an air separation method and device utilizing LNG cold energy that can generate electricity at the same time, the main difference from the first embodiment is that the upper tower 8 mainly produces gaseous oxygen 112 instead of liquid oxygen 105 . A portion of the throttled liquid nitrogen 206 from the small cold box system C liquefies and subcools the gaseous 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. At this time, the liquid nitrogen output of the device will be reduced, and the low-temperature and low-pressure nitrogen gas 110 can also be cancelled accordingly.

Embodiment 3

[0036] Example three: as attached image 3 As shown, an air separation method and device for utilizing LNG cold energy that can simultaneously pressurize low-temperature and low-pressure nitrogen gas to the pressure required by the process, the main difference from the first embodiment is that the low-temperature and low-pressure nitrogen gas 110 is pressurized with a refrigerant to penetrate The flat expansion unit, that is, two parallel refrigerant booster turbo-expanders 24 and 25 are compressed in series at the booster ends so that they can reach the pressure required by the process. The expansion ends of the refrigerant booster turbo-expansion units 24 and 25 are connected in parallel, and the booster ends are connected in series. The refrigerant 401 out of the heat exchanger 2 is divided into three paths: one goes to the booster turbo-expander 24, the other goes to the booster turbo-expander 25, and the rest of the refrigerant is throttled to the booster turbo-expander 2...

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PUM

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Abstract

The invention relates to an air separation plant utilizing LNG cold energy, comprising an air compression and purification system for compressing and purifying raw air, a large cold box system for rectifying the compressed and purified raw air to obtain air separation products, and an air separation system. A small cold box system that realizes heat exchange between LNG and nitrogen that provides cold energy for the large cold box system, a refrigerant circulation system that utilizes the cold energy of natural gas from the small cold box system, and a natural gas cold energy that utilizes the cold energy of the refrigerant circulation system. coolant circulation system. The invention can make better cascade utilization of cold energy of liquefied natural gas, further reduce the unit energy consumption of liquid air separation products, save equipment investment, and obtain better economic and emission reduction benefits.

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 air separation plants, but there is a problem of insufficient utilization of LNG cold energy at present. 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 and air compressor and low temperature nitrogen compressor oil The cooling liquid glycol water 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 a...

Claims

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Application Information

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Patent Type & Authority Patents(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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