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Method for reducing comprehensive energy consumption of air separation

A technology of air separation and energy consumption, applied in liquefaction, solidification, lighting and heating equipment, etc., can solve the problems of increased processing air volume, difficult to meet requirements, low content requirements, etc., to reduce the temperature difference at the cold end and reduce the overall Energy consumption, the effect of reducing energy consumption

Inactive Publication Date: 2010-06-16
四川空分设备(集团)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, some chemical plants have lower requirements on the content of argon in nitrogen, and the existing technology is generally difficult to meet the requirements, or even if the requirements are met, the amount of processing air increases

Method used

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  • Method for reducing comprehensive energy consumption of air separation
  • Method for reducing comprehensive energy consumption of air separation
  • Method for reducing comprehensive energy consumption of air separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Compressed and purified air GA is introduced into heat exchanger E1 through pipeline 101 for low-temperature cooling;

[0037] (2) The cooled air is sent into the lower tower C1 through the 102 pipeline, and the lower tower is carried out heat and mass transfer with the top-down liquid on the tray or packing from bottom to top in the lower tower, and nitrogen is obtained at the top of the lower tower;

[0038](3) The nitrogen generated from the top of the lower tower is divided into two bundles, one of which is sent to the heat exchanger E1 through the pipeline 141 to be reheated to normal temperature, and is drawn out as the pressure nitrogen product PN through the pipeline 142, and the nitrogen product can be directly used as required. Send it to the user's nitrogen pipe network or send it to the user's nitrogen pipe network after being pressurized by the booster NZ to the required pressure; the second bundle of nitrogen enters the condensing evaporator K1 and is c...

Embodiment 2

[0046] The difference between technological process of the present invention and embodiment 1 is:

[0047] Step (3) the nitrogen obtained from the top of the lower tower enters the condensing evaporator K1 and is condensed into liquid nitrogen;

[0048] The condensed liquid nitrogen in step (4) is divided into three bundles, one bundle of liquid nitrogen enters the subcooler E2 through the 121-123 pipeline, and the supercooled liquid nitrogen is divided into two bundles again, and one bundle enters the upper tower C2 through the pipeline 125 The top is used as the reflux liquid for rectification, and the other is drawn through the pipeline 124 as the product liquid nitrogen LN; the condensed second liquid nitrogen enters the lower tower through the 121-122 pipeline as the reflux liquid to continue the rectification; the condensed third liquid nitrogen Nitrogen enters the liquid nitrogen pump NP through the 150 pipeline and is compressed, then sent to the heat exchanger through...

Embodiment 3

[0051] The process flow of the present invention is the combination of embodiment 1 and embodiment 2, that is, it differs from the steps of embodiment 1 in that:

[0052] Step (3) The nitrogen generated from the top C1 of the lower tower is divided into two bundles, one of which is sent to the heat exchanger through the 141 pipeline to be reheated to normal temperature, and is drawn out as the pressure nitrogen product PN through the 142 pipeline, and then passed through the booster NZ pressurized to the required pressure. The second beam of nitrogen enters the condensing evaporator K1 and is condensed into liquid nitrogen;

[0053] The condensed liquid nitrogen in step (4) is divided into three bundles, one bundle of liquid nitrogen enters the subcooler E2 through the 121-123 pipeline, and the supercooled liquid nitrogen is divided into two bundles again, and one bundle enters the upper tower C2 through the pipeline 125 The top is used as the reflux liquid for rectification,...

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Abstract

The invention discloses a method for significantly reducing the comprehensive energy consumption of air separation, which comprises the following steps: feeding large amount of nitrogen pumped from the top of a lower tower into a heat exchanger for reheating and serving as pressure nitrogen products, allowing the rest nitrogen to enter a condenser-evaporator and condensing the rest nitrogen into liquid nitrogen; introducing part of the condensed liquid nitrogen serving as liquid nitrogen products, or pumping large amount of liquid nitrogen for internal compressing and reheating and then using the compressed and reheated liquid nitrogen as medium-pressure products. Because all nitrogen products are from the pressure nitrogen or internally-compressed liquid nitrogen pumped from the top of the lower tower, and the pumped amount is large, but not from the compressed low pressure nitrogen pumped from an upper tower, the pressure nitrogen is fully pumped, the rectification potentials of the upper and lower towers are fully utilized so as to reduce the energy consumption of air separation. Moreover, the backflow liquid of the top of the upper tower is pumped from the liquid nitrogen fraction on the upper part of the lower tower, which can further improve the rectification capacity of the upper tower, and reduce the energy consumption of air separation devices and the content of argon in nitrogen products. The process flow is characterized by optimum process organization, low investment cost of equipment and significant energy consumption reduction.

Description

technical field [0001] The invention relates to an air separation system, in particular to a method for reducing comprehensive energy consumption of air separation. Background technique [0002] The raw material of air separation comes from air, which is inexhaustible and inexhaustible. The economy of air separation is mainly reflected in energy saving. Traditional ideology constrains the consideration of reducing the comprehensive energy consumption of air separation, such as one-sided emphasis on purity and extraction rate, rather than overall consideration of energy consumption. With the enlargement of air separation plants and the development of internal compression air separation, how to save energy is of great importance. In addition, some chemical plants have lower requirements on the content of argon in nitrogen, and the existing technology is generally difficult to meet the requirements, or even if the requirements are met, the amount of processing air increases. ...

Claims

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Application Information

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IPC IPC(8): F25J3/04
Inventor 黄震宇李传明
Owner 四川空分设备(集团)有限责任公司
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