Method for producing liquid oxygen and liquid nitrogen through LNG cold energy and single-tower rectification technology

A technology of liquid oxygen, liquid nitrogen, and rectification, which is applied in the field of air separation-LNG utilization, can solve the problems of complex process and low utilization rate of LNG cold energy, and achieve the effect of simple circulation process

Active Publication Date: 2019-06-07
中科慧智(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Therefore, the technical problem to be solved in the present invention is to overcome the technical problems of complex process and low utilization rate of LNG cold energy in the air separation

Method used

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  • Method for producing liquid oxygen and liquid nitrogen through LNG cold energy and single-tower rectification technology
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  • Method for producing liquid oxygen and liquid nitrogen through LNG cold energy and single-tower rectification technology

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Experimental program
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Effect test

Embodiment 1

[0051] The method for producing liquid oxygen and liquid nitrogen by using LNG cold energy and single-column rectification process, the flow chart is as follows figure 1 , including the following steps:

[0052] (1) Purification step

[0053] The air at normal temperature and pressure enters the air compressor 2 after being filtered by the air filter 1 and is pressurized to 0.8MPa; the pressurized air passes through the purifier I 3 to remove impurities in the air, and the purified air reaches the standard allowed by the air separation process; at the same time, the purifier II 4 performs a regeneration operation; when the purifier I 3 is saturated with impurities in the adsorbed air, switch to the regenerated purifier II 4 to continue purifying the air, and the purifier I 3 starts a regeneration operation; the purifier I 3 and the purifier II 4 alternate Carry out purification operation and regeneration operation for air purification cycle operation;

[0054] (2) Cooling st...

Embodiment 2

[0074] The method for producing liquid oxygen and liquid nitrogen by using LNG cold energy and single-column rectification process, the flow chart is as follows figure 1 , including the following steps:

[0075] (1) Purification step

[0076] The air at normal temperature and pressure is filtered by the air filter 1 and then enters the air compressor 2 to pressurize to 500KPa; the pressurized air passes through the purifier I 3 to remove impurities in the air, and the purified air reaches the standard allowed by the air separation process; at the same time, the purifier II 4. Perform a regeneration operation; when the purifier I 3 absorbs impurities in the air and is saturated, switch to the regenerated purifier II 4 to continue purifying the air, and the purifier I 3 starts a regeneration operation; the purifier I 3 and purifier II 4 are alternately performed Purification operation and regeneration operation for air purification cycle operation;

[0077] (2) Cooling step

...

Embodiment 3

[0089]The method for producing liquid oxygen and liquid nitrogen by using LNG cold energy and single-column rectification process, the flow chart is as follows figure 1 , including the following steps:

[0090] (1) Purification step

[0091] The air at normal temperature and pressure enters the air compressor 2 and is pressurized to 1.2MPa after being filtered by the air filter 1; II 4 performs a regeneration operation; when the purifier I 3 is saturated with impurities in the adsorbed air, switch to the regenerated purifier II 4 to continue purifying the air, and the purifier I 3 starts a regeneration operation; the purifier I 3 and the purifier II 4 alternate Carry out purification operation and regeneration operation for air purification cycle operation;

[0092] (2) Cooling step

[0093] After the purified air is cooled by heat exchanger I 6 and heat exchanger II 7 arranged side by side, it enters heat exchanger III 8 again for secondary cooling to obtain pre-cooled air...

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Abstract

The invention relates to a method for producing liquid oxygen and liquid nitrogen through LNG cold energy and a single-tower rectification technology, and belongs to the field of air separation-LNG utilization. The method comprises the steps of purifying, cooling, rectifying, and LNG cold energy conversion. According to the method, the liquid oxygen, the liquid nitrogen or gaseous nitrogen is generated through the single-tower rectification technology of a main rectification tower and an argon tower, cold energy for main rectification tower top condensation, gaseous nitrogen condensation and air pre-condensation comes from the processes of evaporating, heat exchange, compression, heat exchange and condensation of a refrigerant, and low-temperature whole process cold energy released duringLNG normal pressure gasification is sufficiently recycled by the refrigerant to serve as cold energy required in the air separation process. The circulation process of the refrigerant is simple and convenient, and the refrigerant can recycle 90% or above of the cold energy released during LNG gasification; the gaseous nitrogen of which the purity is higher than 99.99% and the pressure is higher than 0.5MPa, the liquid nitrogen of which the purity is higher than 99.99% and the pressure is higher than 0.5MPa, and the liquid oxygen of which the purity is higher than 99.6% and the pressure is higher than 0.5MPa are obtained, and the power consumption of the liquid oxygen and nitrogen is smaller than 300KW/t; and it can be achieved that production of conventional air separation gas products ofthe same scale is completed through small-size equipment.

Description

technical field [0001] The invention relates to the field of air separation-LNG utilization, in particular to a method for producing liquid oxygen and liquid nitrogen by utilizing LNG cold energy and a single-tower rectification process. Background technique [0002] Distributed LNG gas supply has become an important part of my country's clean energy structure. stored in liquefied natural gas (LNG), liquid nitrogen (LN 2 ), liquid oxygen (LO 2 The low-temperature cold energy in ) is a precious resource obtained by consuming a large amount of electric energy, and it should give full play to its maximum energy efficiency. "External cooling air separation technology" broke the bottleneck of technology development in the industry for decades, and took the lead in proposing and practicing "LNG atmospheric pressure gasification low-temperature cold energy recycling technology", a new way of energy saving and emission reduction. At present, the potential of cold energy recycling...

Claims

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Application Information

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IPC IPC(8): F25J3/04
Inventor 曹建喜
Owner 中科慧智(北京)科技有限公司
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