CN101634513A - Full low-pressure drag flow expanded air separating method and small separating rectification tower thereof - Google Patents
Full low-pressure drag flow expanded air separating method and small separating rectification tower thereof Download PDFInfo
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- CN101634513A CN101634513A CN200910101060A CN200910101060A CN101634513A CN 101634513 A CN101634513 A CN 101634513A CN 200910101060 A CN200910101060 A CN 200910101060A CN 200910101060 A CN200910101060 A CN 200910101060A CN 101634513 A CN101634513 A CN 101634513A
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Abstract
The invention discloses a full low-pressure drag flow expanded air separating method and a small separating rectification tower thereof. An expanded refrigeration working medium of a turbine expansion engine in the separation method is a small part of raw material air after a purifying step; and the invention reduces the operation pressure to 0.55MPa and the energy consumption, improves the purity of oxygen and nitrogen, the extraction rate of the oxygen and yield of the nitrogen by drag flow expansion process flow. A plurality of layers of convection type rectifying devices are arranged in an upper tower in the full low-pressure drag flow expanded small air separating rectification tower; each convection type rectifying device comprises a sieve plate, wherein both sides of the sieve plate are provided with liquid blocking plates; the outer side of the liquid blocking plate at one side is provided with a liquid containing disk, and the outer side of the liquid blocking plate at the other side is provided with an effusion hopper; the positions of the liquid containing disk and the effusion hopper in the convection type rectifying device in the next layer are exchanged relative to the convection type rectifying device in the previous layer, thereby improving the refrigeration efficiency, effectively reducing the air leakage rate, causing no corrosion and prolonging the service life of equipment.
Description
Technical field
The invention belongs to the air separation technology field, specifically relate to a kind of full low-pressure drag flow expanded air separating method and small separating rectification tower thereof.
Background technology
Traditional small air separation equipment all adopts the high pressure technological process, exists shortcomings such as operating pressure height, energy consumption height, service cycle weak point, poor stability.The small air separation equipment of the domestic new development nineties, the equipment operating pressure is reduced between 0.7～0.8MPa, reduced energy consumption significantly, improved security performance, but the technological process of adopting is a stream backed expansion, and its swell refrigeration working medium is nitrogen, and the nitrogen after the expansion promptly enters atmosphere and can't reclaim after reclaiming cold, cause nitrogen output low, shortcomings such as comprehensive utilization performance difference.
The small air separation equipment issue of China is wide, and quantity is many, most of genus high pressure flow process, and the stream backed expansion technological process quantity that grows up is few.According to China's energy shortage, a lot of packaged air separation plants are badly in need of updating, and need full low pressure drag flow expansion packaged air separation plant to satisfy users' demand, for country saves a large amount of electric energy, for users directly create economic benefit.
Summary of the invention
The present invention solves the existing in prior technology technical problem, and a kind of full low pressure drag flow expansion small air separation method and separating rectification tower thereof are provided.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of full low-pressure drag flow expanded air separating method, this method comprises: the step that raw air is sucked by air cleaner, in air cleaner, removed dust and other mechanical admixtures in the described suction step; To the described step of compressing through the raw air of dedusting removal of impurities, described compression step is finished by oilless (oil free) compressor, and its pressure is 0.6MPa; To the step that the raw air of described compression carries out precooling, described precooling step carries out in the cooler unit, is chilled to 5-10 ℃ in advance; The raw air of described precooling is carried out the step of purifying, and described purification step is finished by the suitching type sieve purification system, has removed impurity such as airborne moisture, carbon dioxide, hydrocarbon; The raw air that described purifying is crossed further reduces the step of temperature, and the step of described further reduction temperature is finished by main heat exchanger; To described further reduction temperature raw air carry out the step of swell refrigeration, described swell refrigeration step is finished by turbo-expander, the swell refrigeration working medium of turbo-expander is the fraction raw air behind the purification step; The raw air of described swell refrigeration is carried out the step of air separation, and described air separation step is carried out in rectifying column, draws product oxygen in the bottom of last tower, draws product nitrogen at the top of last tower.
Full low pressure drag flow expansion small air separating rectification tower, comprise tower, several layers convection rectifier unit is set in the last tower, described convection rectifier unit comprises sieve plate, the both sides of sieve plate are provided with liquid barrier, the arranged outside liquid dish of a side liquid barrier wherein, the arranged outside overflow downcomer of opposite side liquid barrier; Relative last layer convection rectifier unit, in following one deck convection rectifier unit, liquid dish and overflow downcomer location swap are provided with.
As preferably, the liquid barrier at overflow downcomer place extends downwards in the described last layer convection rectifier unit, and the upper end of liquid dish place liquid barrier is concordant substantially in its bottom and the following one deck convection rectifier unit.
As preferably, the junction of described convection rectifier unit and last Tata body, following ring welds entirely with tower body, and last ring welds with the tower body interruption, guarantees sieve plate circumference no leakage.
The present invention adopts drag flow expansion process flow process to reduce operating pressure, and operating pressure is 0.55MPa, improves oxygen and nitrogen gas purity, improves the recovery rate of oxygen, cuts down the consumption of energy, and improves nitrogen output greatly; Adopt all-aluminium construction convection sieve plate rectifying column, improve rectification efficiency, reduced released gas rate effectively, do not have corrosion and prolong service life of equipment; The complete set of equipments compact conformation, floor space is little, and energy consumption is low, and stable operation is simple, and is easy to maintenance, realizes that oxygen nitrogen PR is about 1: 2, and comprehensive utilization and variable parameter operation and discontinuity system oxygen performance are good, and energy-saving effect is obvious, is popular in users.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is a kind of structural representation that rectifying column of the present invention is overlooked.
The specific embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment: air separating method of the present invention comprises: the step that raw air is sucked by air cleaner, in air cleaner, removed dust and other mechanical admixtures in the described suction step; To the described step of compressing through the raw air of dedusting removal of impurities, described compression step is finished by oilless (oil free) compressor, and its pressure is 0.6MPa; To the step that the raw air of described compression carries out precooling, described precooling step carries out in the cooler unit, is chilled to 5-10 ℃ in advance; The raw air of described precooling is carried out the step of purifying, and described purification step is finished by the suitching type sieve purification system, has removed impurity such as airborne moisture, carbon dioxide, hydrocarbon; The raw air that described purifying is crossed further reduces the step of temperature, and the step of described further reduction temperature is finished by main heat exchanger; To described further reduction temperature raw air carry out the step of swell refrigeration, described swell refrigeration step is finished by turbo-expander, the swell refrigeration working medium of turbo-expander is the fraction raw air behind the purification step; The raw air of described swell refrigeration is carried out the step of air separation, and described air separation step is carried out in rectifying column, draws product oxygen in the bottom of last tower, draws product nitrogen at the top of last tower.
Referring to Fig. 1 and Fig. 2, full low pressure drag flow expansion small air separating rectification tower, comprise tower 1, several layers convection rectifier unit is set in the last tower, described convection rectifier unit comprises sieve plate 2, the both sides of sieve plate are provided with liquid barrier 5, the arranged outside liquid dish 3 of a side liquid barrier wherein, the arranged outside overflow downcomer 4 of opposite side liquid barrier.Relative last layer convection rectifier unit, in following one deck convection rectifier unit, liquid dish and overflow downcomer location swap are provided with; The liquid barrier at overflow downcomer place extends downwards in the last layer convection rectifier unit, and the upper end of liquid dish place liquid barrier is concordant substantially in its bottom and the following one deck convection rectifier unit.The junction of convection rectifier unit and last Tata body, following ring welds entirely with tower body, and last ring is interrupted welding with tower body, guarantees sieve plate circumference no leakage.
At last, should be pointed out that above embodiment only is the more representational example of the present invention.Obviously, technical scheme of the present invention is not limited to the foregoing description, and many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (4)
1. full low-pressure drag flow expanded air separating method, this method comprises:
The step that raw air is sucked by air cleaner has been removed dust and other mechanical admixtures in air cleaner in the described suction step;
To the described step of compressing through the raw air of dedusting removal of impurities, described compression step is finished by oilless (oil free) compressor, and its pressure is 0.6MPa;
To the step that the raw air of described compression carries out precooling, described precooling step carries out in the cooler unit, is chilled to 5-10 ℃ in advance;
The raw air of described precooling is carried out the step of purifying, and described purification step is finished by the suitching type sieve purification system, has removed impurity such as airborne moisture, carbon dioxide, hydrocarbon;
The raw air that described purifying is crossed further reduces the step of temperature, and the step of described further reduction temperature is finished by main heat exchanger;
To described further reduction temperature raw air carry out the step of swell refrigeration, described swell refrigeration step is finished by turbo-expander;
The raw air of described swell refrigeration is carried out the step of air separation, and described air separation step is carried out in rectifying column, draws product oxygen in the bottom of last tower, draws product nitrogen at the top of last tower;
It is characterized in that in the described swell refrigeration step that the swell refrigeration working medium of turbo-expander is the fraction raw air behind the purification step.
2. according to the described full low pressure drag flow expansion small air separating rectification tower of claim 1, comprise tower (1), several layers convection rectifier unit is set in the last tower (1), it is characterized in that described convection rectifier unit comprises sieve plate (2), the both sides of sieve plate (2) are provided with liquid barrier (5), the arranged outside liquid dish (3) of a side liquid barrier (5) wherein, the arranged outside overflow downcomer (4) of opposite side liquid barrier (5); Relative last layer convection rectifier unit, in following one deck convection rectifier unit, liquid dish (3) and overflow downcomer (4) location swap setting.
3. full low pressure drag flow expansion small air separating rectification tower according to claim 2, it is characterized in that overflow downcomer (4) is located in the described last layer convection rectifier unit liquid barrier (5) extends downwards, it is concordant substantially that liquid dish (3) is located the upper end of liquid barrier (5) in its bottom and the following one deck convection rectifier unit.
4. according to claim 2 or 3 described full low pressure drag flow expansion small air separating rectification towers, it is characterized in that the junction of described convection rectifier unit and Shang Ta (1) tower body, following ring welds entirely with tower body, and last ring is interrupted welding with tower body.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910101060A CN101634513A (en) | 2009-07-31 | 2009-07-31 | Full low-pressure drag flow expanded air separating method and small separating rectification tower thereof |
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| CN200910101060A CN101634513A (en) | 2009-07-31 | 2009-07-31 | Full low-pressure drag flow expanded air separating method and small separating rectification tower thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103314214A (en) * | 2010-12-13 | 2013-09-18 | 朗盛德国有限责任公司 | Compressor and method for compressing technical gases |
| CN104251599A (en) * | 2014-07-12 | 2014-12-31 | 孙竟成 | Ultralow pressure air separation plant process flow |
-
2009
- 2009-07-31 CN CN200910101060A patent/CN101634513A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103314214A (en) * | 2010-12-13 | 2013-09-18 | 朗盛德国有限责任公司 | Compressor and method for compressing technical gases |
| CN103314214B (en) * | 2010-12-13 | 2015-11-25 | 朗盛德国有限责任公司 | Compressor and the method for compressing industrial gas |
| US9447782B2 (en) | 2010-12-13 | 2016-09-20 | Lanxess Deutschland Gmbh | Compressor and method for compressing technical gases |
| CN104251599A (en) * | 2014-07-12 | 2014-12-31 | 孙竟成 | Ultralow pressure air separation plant process flow |
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Open date: 20100127 |