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High-temperature and low-temperature expansion energy-saving nitrogen production device and nitrogen production method

A double-expansion, energy-saving technology, applied in refrigeration and liquefaction, liquefaction, solidification, etc., can solve the problem of high energy consumption

Active Publication Date: 2015-03-04
HANGZHOU FORTUNE CRYOGENIC EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the shortcomings of high energy consumption in the prior art, the present invention provides a high-low temperature dual-expansion energy-saving nitrogen production device and a nitrogen production method

Method used

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  • High-temperature and low-temperature expansion energy-saving nitrogen production device and nitrogen production method
  • High-temperature and low-temperature expansion energy-saving nitrogen production device and nitrogen production method
  • High-temperature and low-temperature expansion energy-saving nitrogen production device and nitrogen production method

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Embodiment 1

[0024] High and low temperature dual-expansion energy-saving nitrogen generators, such as figure 1 As shown, the arrow in the figure indicates the flow direction of the stream, including the filter 1, the air compressor 2 connected to the filter 1 through pipelines, the pre-cooling heat exchanger 3 connected to the air compressor 2 through pipelines, and the pre-cooling heat exchanger Heater 3 is connected to purification device 4 by pipeline, and cold box 5 is connected to purification device 4 by pipeline. Cold box 5 includes main heat exchanger 6, rectification tower 7, condensation evaporator 8, subcooler 9, Pressure turbo expander 10, low temperature expander 20.

[0025] The main heat exchanger 6 comprises a first pipeline 11, a second pipeline 12, a third pipeline 13, a fourth pipeline 14 ( figure 1 From right to left in the middle are the first pipeline 11, the second pipeline 12, the third pipeline 13 and the fourth pipeline 14). Subcooler 9 includes the fifth pipel...

Embodiment 2

[0039] The high and low temperature dual expansion energy-saving nitrogen production method comprises the following steps:

[0040] a. Filter the raw material air through the filter 1, and the air after filtering out impurities enters the air compressor 2, and is compressed to 7bar to 10bar in the air compressor 2. In this embodiment, the air is compressed to 8bar in the air compressor 2 , the air compressed to 8 bar enters the pre-cooling heat exchanger 3, and after the air is cooled and separated from free water in the pre-cooling heat exchanger 3, the air enters the purification device 4; the moisture and carbon dioxide in the air in the purification device 4 To be cleared, to get purified air.

[0041] b. the purified air obtained in step a is delivered to the second pipeline 12 of the main heat exchanger 6 in the cold box 5 for cooling, and the air cooled to a temperature of 104K to 112K enters the rectification column 7 from the inlet Distillation column 7 carries out r...

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Abstract

The invention relates to a high-temperature and low-temperature expansion energy-saving nitrogen production device and a nitrogen production method. The high-temperature and low-temperature expansion energy-saving nitrogen production device comprises a precooling heat exchanger and a cooling box connected with the precooling heat exchanger, wherein the cooling box comprises a main heat exchanger, a rectifying tower, a condensation evaporator, a supercooler and a high-temperature supercharge turbine expander. The high-temperature and low-temperature expansion energy-saving nitrogen production device and the nitrogen production method have the advantages that the temperature of air in the rectifying tower is improved, the air is in a superheated state and then enters the rectifying tower, the rectification of the rectifying tower is facilitated and the nitrogen extraction rate is improved; since the air inlet temperature of the high-temperature supercharge turbine expander is high, the output power is larger, the product nitrogen is supercharged by using output power, the operating pressure of an air compressor and the rectifying tower is reduced, the energy consumption of the air compressor is reduced, the separation effect of the rectifying tower is improved and the nitrogen extraction rate is improved.

Description

technical field [0001] The invention relates to nitrogen production technology, in particular to a high-low temperature double-expansion energy-saving nitrogen production device and a nitrogen production method. Background technique [0002] At present, the demand for nitrogen products is increasing, especially the energy consumption of small nitrogen generators is difficult to reduce, how to reduce the energy consumption of nitrogen generators is very important. The higher the pressure required for nitrogen products, the greater the amount of nitrogen pollution under pressure. The current general practice is to expand part of the pressure oxygen-enriched air, and throttle the rest of the pressure oxygen-enriched air. The output power of the expander boosts the raw material air or uses fan braking Empty; the oxygen-enriched liquid air is not too cold, or the oxygen-enriched air from the condensing evaporator is too cold. However, the energy consumption of nitrogen generator...

Claims

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Application Information

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IPC IPC(8): F25J3/04
Inventor 阮家林董华艳葛浩俊冶小军韩领先
Owner HANGZHOU FORTUNE CRYOGENIC EQUIP CO LTD
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