CN107174832A - Gas purification high-purity distillation technology and equipment - Google Patents
Gas purification high-purity distillation technology and equipment Download PDFInfo
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- CN107174832A CN107174832A CN201710453687.8A CN201710453687A CN107174832A CN 107174832 A CN107174832 A CN 107174832A CN 201710453687 A CN201710453687 A CN 201710453687A CN 107174832 A CN107174832 A CN 107174832A
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- gas
- purifying column
- purification
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- carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Chemical Kinetics & Catalysis (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a kind of gas purification high-purity distillation equipment, including liquefier and purifying column, the heat exchange coil access unstripped gas of the purification tower bottom is used as heat source, reflux condenser is provided with the top of purifying column, the operative liquid carbon dioxide that the reflux condenser is come out using purification tower bottom is as condensing agent.Also disclose gas purification high-purity distillation technology, unstripped gas is after desulfurization, drying, enter liquefier after liquid CO 2 heat exchange in into the heat exchange coil and tower of purification tower bottom, then purifying column top is out entered from liquefier, liquid CO 2 flows to bottom and enters low temperature storing tank, gas phase enters in the reflux condenser at the top of purifying column, and the carbon dioxide adulterated in gas phase is condensed into liquid flow and entered to bottom in low temperature storing tank, and the discharge of remaining light-component gas is extraneous to reclaim；Reflux condenser at the top of purifying column is used as condensing agent using liquid carbon dioxide.Present device and process costs are low, recovery rate of CO 2 is high, it is more thorough to purify.
Description
Technical field
The present invention relates to technical field of environmental protection in chemical industry, and in particular to a kind of gas purification high-purity distillation technology and equipment.
Background technology
With China's industrial expansion, the discharge capacity of carbon dioxide is rising year by year, numerous boiler, kiln, combustion furnace,
The bodies of heater such as calcining furnace, continuously discharge carbon dioxide, and a large amount of discharges of carbon dioxide cause Global Greenhouse Effect,
Caused environmental hazard is attracted worldwide attention, therefore it is increasingly urgent to accelerate the recovery and emission reduction of research carbon dioxide.
Carbon dioxide is a kind of important industrial chemicals, and the industry such as food, light industry, metallurgy, chemical industry is required to substantial amounts of two
Carbon oxide gas, but hundred million tons/year of the not enough l of carbon dioxide utilization of discharge, therefore study the recycling of carbon dioxide
With regard to particularly important.At present, reclaiming the technology of carbon dioxide mainly has：(1) high-pressure process, (2) pressure swing adsorption method, (3) low hypothermia are inhaled
Attached rectification method.(1) high-pressure process is due to pressure height, and many cleaning equipments are big because of manufacture difficulty, and manufacturing cost height is not used, impurity
Because pressure is high and is dissolved in the product, causes product quality low, be only used for general industry.(2) pressure swing adsorption method is obtained
Product purity and impurity content fluctuation are big, and product design is difficult to reach requirement, it is difficult to ensure that product quality is stable for a long time, particularly
To trace specified in international beverage carbon dioxide standard and food-grade carbon-dioxide national standard and ultratrace impurity index without
Method ensures stable, and the method product only can be used as industrial goods.(3) low hypothermia absorption distillation method is inhaled in actual production due to different
The attached dose of adsorption capacity to different impurities is different, and impurities in feed gas content is different, it is difficult to ensure that a variety of adsorbents are penetrated simultaneously
Failure, possible a certain or several adsorbents, which have been penetrated, to be failed, and other adsorbents have not expired, so as to be difficult to ensure that original
Expect that plurality of impurities is simultaneously qualified in gas, as pressure-variable adsorption, international beverage carbon dioxide standard and food-grade carbon-dioxide state
Trace and ultratrace impurity index can not ensure stabilization in the standard of border.
Traditional condensation purifying technique is used as the heat source of purification tower bottom, tower using the hot gas ammonia of ice maker compressor outlet
The liquefied ammonia that top is provided using ice maker system is used as refrigerant.Can only be by purification tower top emptying incoagulable gas using liquefied ammonia refrigeration
- 20 DEG C are cooled to, the carbon dioxide content in now dropping a hint reaches 80% or so.
The content of the invention
The purpose of the present invention is to overcome defect of the prior art there is provided a kind of cost is low, recovery rate of CO 2 is high, net
Change more thoroughly gas purification high-purity distillation technology and equipment.
The present invention solves the technical scheme that its technical problem is used：
A kind of gas purification high-purity distillation equipment, including liquefier and purifying column, the heat exchange coil of the purification tower bottom
Unstripped gas is accessed as heat source, purifying column top is provided with reflux condenser, and the reflux condenser uses purifying column bottom
The operative liquid carbon dioxide that portion comes out is as condensing agent.
A kind of gas purification high-purity distillation technology, unstripped gas is after desulfurization, drying, into above-mentioned rectifying device, raw material
Gas is introduced into the heat exchange coil of purification tower bottom and tower enters liquefier after liquid CO 2 heat exchange, then goes out from liquefier
To enter purifying column top, liquid CO 2 flows to bottom and enters low temperature storing tank, the returned cold that gas phase enters at the top of purifying column
In condenser, the carbon dioxide adulterated in gas phase is condensed into liquid flow and entered to bottom in low temperature storing tank, remaining light-component gas
Discharge is extraneous to reclaim.
The liquefier is used as condensing agent using liquefied ammonia.
Raw gas pressure is 2.5-4MPa in the liquefier.
In the above-mentioned technical solutions, unstripped gas is less than 20ppm through desulfurization, dried moisture.
The beneficial effects of the invention are as follows：Using heat source of the dried unstripped gas as purification tower bottom, it is not only
Rectification and purification provides heat, and has carried out precooling to unstripped gas, has reclaimed cold；New technology is come out using purification tower bottom
Partial CO 2 as refrigerant, because the cryogenic temperature of carbon dioxide is lower than liquefied ammonia cryogenic temperature, will can purify
The incoagulable gas of tower top emptying is cooled to -50 DEG C, and the carbon dioxide content in now dropping a hint only has 42% or so, carries significantly
The high rate of recovery of carbon dioxide, and also reduce the cooling load of supporting ice maker system.The new technology and traditional one-level
Purification or the technique without rectification and purification are compared, and emptying amount is small, recovery rate of CO 2 is higher than traditional handicraft by 15%~45%；Product
Quality is good, and its food grade products ensures disposably to reach or better than new national standard and international quality standards food-grade carbon-dioxide mark
It is accurate.The new technology makes full use of liquid CO 2 refrigeration principle, realizes the comprehensive utilization of energy, reaches energy-saving mesh
's.When using the suitable source of the gas of carbon dioxide content as raw material, purification (i.e. two grades purifications) behaviour of the new technology food grade products
Make pressure ratio traditional handicraft lower, therefore end product quality is more preferable than traditional handicraft.Under identical purification precision, purification is more
Plus thoroughly.The new technology is applied to advantage when low concentration of carbon dioxide industrial waste gas is handled and is especially apparent.
Brief description of the drawings
Fig. 1 is the structural representation of the gas purification high-purity distillation equipment of the present invention.
Embodiment
With reference to embodiment, the invention will be further described, but not thereby limiting the invention.
Embodiment 1
A kind of gas purification high-purity distillation equipment, as shown in figure 1, being mainly made up of liquefier 1 and purifying column 2, purifying column 2
The access unstripped gas of heat exchange coil 3 of bottom is provided with reflux condenser 4, reflux condenser as heat source, the top of purifying column 2
The 4 operative liquid carbon dioxide come out using the bottom of purifying column 2 are as condensing agent.
When carrying out gas purification high-purity distillation, the unstripped gas used comes from industrial carbon dioxide tail gas, and unstripped gas is through de-
After sulphur, drying, rectification and purification is carried out using present invention process, shown in technological process reference picture 1：Unstripped gas through desulfurization, dry after,
Enter liquefier 1 (using liquefied ammonia refrigeration) in into the heat exchange coil 3 and tower of the bottom of purifying column 2 after liquid CO 2 heat exchange,
Then the top of purifying column 2 is out entered from liquefier 1, liquid CO 2 flows to bottom and enters low temperature storing tank, and gas phase, which enters, to be carried
In the reflux condenser 4 at the pure top of tower 2 so that the partial CO 2 adulterated in gas phase is condensed into liquid flow and entered to bottom
In low temperature storing tank, the discharge of remaining light-component gas is extraneous to reclaim.The reflux condenser 4 at the top of purifying column 2 is using the bottom of purifying column 2
Operative liquid carbon dioxide out is as condensing agent, rather than uses traditional liquefied ammonia condensing agent, the cryogenic temperature of carbon dioxide
Lower than liquefied ammonia cryogenic temperature, the incoagulable gas that purifying column 2 can be pushed up into emptying is cooled to -50 DEG C, in now dropping a hint
Carbon dioxide content only has 42% or so, substantially increases the rate of recovery of carbon dioxide, and also reduces supporting ice maker system
Cooling load.
Present invention process is compared with traditional one-level purification or technique without rectification and purification, and emptying amount is small, and carbon dioxide is returned
Yield is higher than traditional handicraft by 15%~45%；Good product quality, its food grade products ensure disposably to reach or better than new national standard
With international quality standards food-grade carbon-dioxide standard.
Present invention process makes full use of liquid CO 2 refrigeration principle, realizes the comprehensive utilization of energy, reaches energy-conservation drop
The purpose of consumption.When using the suitable source of the gas of carbon dioxide content as raw material, (i.e. two grades carry for the purification of the new technology food grade products
It is pure) operating pressure is lower than traditional handicraft, therefore end product quality is more preferable than traditional handicraft.Under identical purification precision,
Purification is more thorough.
Claims (5)
1. a kind of gas purification high-purity distillation equipment, including liquefier and purifying column, it is characterised in that：The purification tower bottom
Heat exchange coil accesses unstripped gas as heat source, and purifying column top is provided with reflux condenser, and the reflux condenser is used
The operative liquid carbon dioxide that purification tower bottom comes out is as condensing agent.
2. a kind of gas purification high-purity distillation technology, it is characterised in that：Unstripped gas is after desulfurization, drying, into claim 1 institute
The rectifying device stated, unstripped gas is introduced into the heat exchange coil of purification tower bottom and tower enters liquefaction after liquid CO 2 heat exchange
Device, then out enters purifying column top from liquefier, and liquid CO 2 flows to bottom and enters low temperature storing tank, and gas phase, which enters, to be carried
In the reflux condenser of pure top of tower, the carbon dioxide adulterated in gas phase is condensed into liquid flow and enters low temperature storing tank to bottom
In, the discharge of remaining light-component gas is extraneous to reclaim.
3. gas purification high-purity distillation technology as claimed in claim 2, it is characterised in that：The liquefier uses liquefied ammonia conduct
Condensing agent.
4. gas purification high-purity distillation technology as claimed in claim 2, it is characterised in that：Raw gas pressure in the liquefier
For 2.5-4MPa.
5. gas purification high-purity distillation technology as claimed in claim 2, it is characterised in that：Unstripped gas is through desulfurization, dried
Moisture is less than 20ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710453687.8A CN107174832A (en) | 2017-06-15 | 2017-06-15 | Gas purification high-purity distillation technology and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710453687.8A CN107174832A (en) | 2017-06-15 | 2017-06-15 | Gas purification high-purity distillation technology and equipment |
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| CN107174832A true CN107174832A (en) | 2017-09-19 |
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| CN201710453687.8A Pending CN107174832A (en) | 2017-06-15 | 2017-06-15 | Gas purification high-purity distillation technology and equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108821289A (en) * | 2018-08-17 | 2018-11-16 | 山东京博众诚清洁能源有限公司 | A kind of process units and method of food-grade carbon-dioxide |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020117391A1 (en) * | 2001-01-31 | 2002-08-29 | Beam Craig A. | High purity CO2 and BTEX recovery |
| CN101040674A (en) * | 2007-04-29 | 2007-09-26 | 湖南凯美特气体有限公司 | Method for producing food level liquid carbon dioxide product |
| CN101343061A (en) * | 2008-08-15 | 2009-01-14 | 杭州快凯高效节能新技术有限公司 | Method and apparatus for preparing food level liquid carbon dioxide with flue gas |
| CN102303864A (en) * | 2011-08-12 | 2012-01-04 | 惠州凯美特气体有限公司 | Production method of food-grade liquid carbon dioxide product |
| CN205079544U (en) * | 2015-10-29 | 2016-03-09 | 西亚特工业气体科技（杭州）有限公司 | Preparation facilities of oxygen -enriched air product |
| CN206126859U (en) * | 2016-08-29 | 2017-04-26 | 新疆深冷气体有限公司 | Pure carbon dioxide's of heat pump distillation production superelevation device |
-
2017
- 2017-06-15 CN CN201710453687.8A patent/CN107174832A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020117391A1 (en) * | 2001-01-31 | 2002-08-29 | Beam Craig A. | High purity CO2 and BTEX recovery |
| CN101040674A (en) * | 2007-04-29 | 2007-09-26 | 湖南凯美特气体有限公司 | Method for producing food level liquid carbon dioxide product |
| CN101343061A (en) * | 2008-08-15 | 2009-01-14 | 杭州快凯高效节能新技术有限公司 | Method and apparatus for preparing food level liquid carbon dioxide with flue gas |
| CN102303864A (en) * | 2011-08-12 | 2012-01-04 | 惠州凯美特气体有限公司 | Production method of food-grade liquid carbon dioxide product |
| CN205079544U (en) * | 2015-10-29 | 2016-03-09 | 西亚特工业气体科技（杭州）有限公司 | Preparation facilities of oxygen -enriched air product |
| CN206126859U (en) * | 2016-08-29 | 2017-04-26 | 新疆深冷气体有限公司 | Pure carbon dioxide's of heat pump distillation production superelevation device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108821289A (en) * | 2018-08-17 | 2018-11-16 | 山东京博众诚清洁能源有限公司 | A kind of process units and method of food-grade carbon-dioxide |
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Application publication date: 20170919 |
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