CN104998513A - Carbon dioxide rectification emission-reducing process and apparatus thereof - Google Patents
Carbon dioxide rectification emission-reducing process and apparatus thereof Download PDFInfo
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- CN104998513A CN104998513A CN201510429035.1A CN201510429035A CN104998513A CN 104998513 A CN104998513 A CN 104998513A CN 201510429035 A CN201510429035 A CN 201510429035A CN 104998513 A CN104998513 A CN 104998513A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The present invention relates to a carbon dioxide rectification emission-reducing process, which comprises: introducing waste gas discharged from the top of a carbon dioxide rectification tower into a condensation evaporator to be frozen so as to make the carbon dioxide in the waste gas be frozen into the condensation evaporator to become the carbon dioxide solid, and re-heating the carbon dioxide solid so as to liquefy into the liquid carbon dioxide and reflux into the carbon dioxide rectification tower. The apparatus used by the carbon dioxide rectification emission-reducing process comprises the carbon dioxide rectification tower and a plurality of condensation evaporators arranged on the top of the carbon dioxide rectification tower so as to alternately perform freezing and reheating, wherein the gas inlet of the condensation evaporator is connected with the waste gas outlet on the top of the carbon dioxide rectification tower, the gas outlet forms the discharge port, and a cold source channel for circulating a cold source required by freezing and a thermal source channel for circulating a thermal source required by re-heating are respectively arranged in the condensation evaporator. With the process and the apparatus of the present invention, the concentration of the carbon dioxide in the waste gas discharged from the top of the carbon dioxide rectification tower can be reduced while the cost and the energy consumption are low so as to achieve the comprehensive utilization of resources.
Description
Technical field
The present invention relates to a kind of technique of the carbon dioxide for rectifying carbon dioxide and in emissions reduction waste gas and realize the device that this technique adopts.
Background technology
Due to carbon dioxide comparatively other component gas (as nitrogen, hydrogen, oxygen etc.), its solidification temperature is much higher, very easily cause freezeout, therefore in carbon dioxide rectification and purification technique, for ensureing the continuous and steady operation of distillation process, must guarantee that rectification temperature can perform more than the solidification temperature of this rectifying condition carbon dioxide, and need to arrange certain temperature margin.Such technique can cause the carbon dioxide in waste gas concentration of rectifying column tower top discharge higher (being generally greater than 30%), and at the bottom of tower, the rate of recovery of carbon dioxide reduces relatively.
At present, the emission-reducing process adopted in order to the gas concentration lwevel reduced in tower top waste gas mainly contains: improve rectifying column operating pressure method.The method improves the condensation temperature of carbon dioxide by the operating pressure improved in rectifying column, thus is conducive to carbon dioxide condensing, and then reduces the discharge capacity of carbon dioxide in waste gas, can reduce the gas concentration lwevel in waste gas to a certain extent.But the raising corresponding energy consumption of Rectification column pressure and cost all can increase, and economy is not high, and operating pressure raises the safety operation being also unfavorable for rectifying column.
Along with the expanding day of carbon dioxide purification scale, in order to maintaining ecological balance, reduce CO2 emission very urgent, therefore must develop new carbon dioxide discharge-reduction technique and device.
Summary of the invention
The object of this invention is to provide a kind of can the carbon dioxide rectifying emission-reducing process of emissions reduction carbon dioxide in waste gas concentration and device.
For achieving the above object, the technical solution used in the present invention is:
A kind of carbon dioxide rectifying emission-reducing process, gas concentration lwevel for carbon dioxide rectifying and in emissions reduction waste gas, described technique is: pass in condenser/evaporator freezing by the waste gas of carbon dioxide rectifying tower tower top discharge, carbon dioxide in described waste gas is frozen in described condenser/evaporator and becomes carbon dioxide solid, carbon dioxide solid again described in re-heat, makes it liquefy and continues rectifying for being back to after liquid CO 2 in described carbon dioxide rectifying tower.
By passing into the freezing described waste gas of low-temperature receiver in described condenser/evaporator.
By passing into the carbon dioxide solid described in the carbon dioxide liquid re-heat in described condenser/evaporator, described liquid CO 2 derives from the bottom of described carbon dioxide rectifying tower tower.
Described freezing and described re-heat hockets in multiple described condenser/evaporator.
The device that a kind of above-mentioned carbon dioxide rectifying emission-reducing process adopts, comprise carbon dioxide rectifying tower, be arranged at described carbon dioxide rectifying tower tower top with the freezing and re-heat of hocketing multiple condenser/evaporators, the air inlet of described condenser/evaporator is connected through air bleeding valve with the waste gas outlet of described carbon dioxide rectifying tower tower top, the gas outlet of described condenser/evaporator forms floss hole through air outlet valve, be respectively arranged with in described condenser/evaporator for the described freezing low-temperature receiver path of required low-temperature receiver circulation and the thermal source path for the described heat-source Cycles needed for re-heat.
Described condenser/evaporator is the heat exchanger of plate type heat exchanger or band filler.
Be connected to described condenser/evaporator at the bottom of described carbon dioxide rectifying tower tower and form described thermal source path, thus using the liquid CO 2 at the bottom of described carbon dioxide rectifying tower tower as described thermal source.
Because technique scheme is used, the present invention compared with prior art has following advantages: the concentration of the carbon dioxide in waste gas that technique of the present invention and device can make rectifying tower top discharge is reduced within 1%, and cost and energy consumption lower, reach the object of comprehensive utilization of resources.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram of carbon dioxide rectifying emission reduction device of the present invention.
In above accompanying drawing:
1, carbon dioxide rectifying tower; 2, condenser/evaporator; 3, floss hole; 4, air bleeding valve; 5, air outlet valve; 6, low-temperature receiver path; 7, thermal source path; 8, control valve; 9, choke valve; 10, liquid CO 2 outlet.
Detailed description of the invention
Below in conjunction with embodiment shown in the drawings, the invention will be further described.
Embodiment one: a kind of carbon dioxide rectifying emission reduction device, gas concentration lwevel for carbon dioxide rectifying and in emissions reduction waste gas, as shown in Figure 1, they several condenser/evaporators 2 comprising a carbon dioxide rectifying tower 1 and be arranged on this carbon dioxide rectifying tower 1 top.In the present embodiment, arrange two condenser/evaporators 2, these two condenser/evaporators 2 are arranged in parallel.Each condenser/evaporator 2 all has air inlet and gas outlet, and air inlet is connected by the waste gas outlet of air inlet pipeline with carbon dioxide rectifying tower 1 tower top, air inlet pipeline is provided with air bleeding valve 4; Gas outlet then connects gas exhaust piping and forms floss hole 3, gas exhaust piping is provided with air outlet valve 5.Each air bleeding valve 4 and air outlet valve 5 all can control its opening and closing by control system.
These two condenser/evaporators 2, for freezing and these two processes of re-heat that hocket, therefore, are provided with in each condenser/evaporator 2 for the freezing low-temperature receiver path 6 of required low-temperature receiver circulation and the thermal source path 7 for the heat-source Cycles needed for re-heat.Low-temperature receiver path 6 is connected with low-temperature receiver, and is connected in condenser/evaporator 2, thus can provide low-temperature receiver to condenser/evaporator 2.Thermal source path 7 is by drawing condenser/evaporator 2 again after being connected to condenser/evaporator 2 at the bottom of carbon dioxide rectifying tower 1 tower and being formed, cause on the pipeline on the pipeline of condenser/evaporator 2 and be provided with control valve 8, draw on the pipeline after condenser/evaporator 2 and be provided with choke valve 9, and form liquid carbon dioxide product 10 in extraction pipeline rear end, thus the liquid CO 2 at the bottom of carbon dioxide rectifying tower 1 tower is applied to the re-heat of condenser/evaporator 2 by it as thermal source.
Condenser/evaporator 2 in above-mentioned carbon dioxide rectifying emission reduction device can adopt the heat exchanger of plate type heat exchanger or band filler.
The technique that above-mentioned carbon dioxide rectifying emission reduction device carries out carbon dioxide discharge-reduction rectifying is: pass in condenser/evaporator 2 freezing by the waste gas of carbon dioxide rectifying tower 1 tower top discharge, carbon dioxide in waste gas is frozen in condenser/evaporator 2 and becomes carbon dioxide solid, re-heat carbon dioxide solid again, makes it liquefy and continues rectifying for being back to after liquid CO 2 in carbon dioxide rectifying tower 1.
Concrete, hocket freezing and re-heat process in two condenser/evaporators 2, carry out freezing with the condenser/evaporator 2 in left side in accompanying drawing 1, it is example that the condenser/evaporator 2 on right side carries out re-heat, low-temperature receiver is passed in condenser/evaporator 2 to the left, the waste gas containing carbon dioxide component that carbon dioxide rectifying tower 1 tower top is discharged rises to the condenser/evaporator 2 carrying out refrigerating process that this is arranged in left side, by the low-temperature receiver passed in condenser/evaporator 2, carbon dioxide be wherein frozen in the surface of plank frame or filling-material structure in heat exchanger and become solid, along with freezing carrying out, gas circulating resistance in the condenser/evaporator 2 of left side increases gradually.Resistance is wherein monitored, to switch when resistance reaches certain value by checkout gear.After switching, the condenser/evaporator 2 in left side carries out re-heat and the condenser/evaporator 2 on right side carries out freezing.During re-heat, entered in the condenser/evaporator 2 in left side by the liquid CO 2 obtained at the bottom of carbon dioxide rectifying tower 1 tower, flowed out by liquid carbon dioxide product 10 with after the carbon dioxide heat exchange freezed, the carbon dioxide freezed in the condenser/evaporator 2 of left side is melted as carbon dioxide liquid, is then back to rectifying again in carbon dioxide rectifying tower 1 by self gravitation effect.Right side condenser/evaporator 2 in freezing identical with said process with re-heat process, when the condenser/evaporator 2 in left side carries out freezing, the condenser/evaporator 2 on right side carries out re-heat; When the condenser/evaporator 2 in left side carries out re-heat, the condenser/evaporator 2 on right side carries out freezing, thus realize freezing and re-heat alternately.
By said apparatus and technique, the carbon dioxide in waste gas concentration given off by floss hole 3 can be made to be reduced to less than 1%.This technique has following characteristics: 1, adopt the feature that carbon dioxide solidification temperature is relatively high, and, the plate type heat exchanger of compact conformation large in intensity or the heat exchanger surface of band filler freeze; 2, adopt two condenser/evaporator 2 switchover operations, the continuous running of package unit can be ensured; 3, in condenser/evaporator 2 drikold enrichment number affect overhead gas stream by the resistance of condenser/evaporator 2, determine to switch air bleeding valve 4 and air outlet valve 5 by the size variation of resistance; 4, due to bottom product liquid CO 2, comparatively overhead gas temperature is higher, the condenser/evaporator 2 at the bottom product liquid re-heat top before throttling can be utilized, make the drikold liquefaction condensed in condenser/evaporator 2, again be back in tower, thus make full use of thermal source and low-temperature receiver, reach the comprehensive utilization of resource.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (7)
1. a carbon dioxide rectifying emission-reducing process, gas concentration lwevel for carbon dioxide rectifying and in emissions reduction waste gas, it is characterized in that: described technique is: the waste gas of carbon dioxide rectifying tower tower top discharge is passed in condenser/evaporator freezing, carbon dioxide in described waste gas is frozen in described condenser/evaporator and becomes carbon dioxide solid, carbon dioxide solid again described in re-heat, makes it liquefy and continues rectifying for being back to after liquid CO 2 in described carbon dioxide rectifying tower.
2. carbon dioxide rectifying emission-reducing process according to claim 1, is characterized in that: by passing into the freezing described waste gas of low-temperature receiver in described condenser/evaporator.
3. carbon dioxide rectifying emission-reducing process according to claim 1, it is characterized in that: by passing into the carbon dioxide solid described in the carbon dioxide liquid re-heat in described condenser/evaporator, described liquid CO 2 derives from the bottom of described carbon dioxide rectifying tower tower.
4. the carbon dioxide rectifying emission-reducing process according to claim 1 or 2 or 3, is characterized in that: described freezing and described re-heat hockets in multiple described condenser/evaporator.
5. the device of a carbon dioxide rectifying emission-reducing process employing as claimed in claim 1, it is characterized in that: it comprises carbon dioxide rectifying tower, be arranged at described carbon dioxide rectifying tower tower top with the freezing and multiple condenser/evaporators that are re-heat that hocket, the air inlet of described condenser/evaporator is connected through air bleeding valve with the waste gas outlet of described carbon dioxide rectifying tower tower top, the gas outlet of described condenser/evaporator forms floss hole through air outlet valve, be respectively arranged with in described condenser/evaporator for the described freezing low-temperature receiver path of required low-temperature receiver circulation and the thermal source path for the described heat-source Cycles needed for re-heat.
6. device according to claim 5, is characterized in that: described condenser/evaporator is the heat exchanger of plate type heat exchanger or band filler.
7. the device according to claim 5 or 6, it is characterized in that: be connected to described condenser/evaporator at the bottom of described carbon dioxide rectifying tower tower and form described thermal source path, thus using the liquid CO 2 at the bottom of described carbon dioxide rectifying tower tower as described thermal source.
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| CN201510429035.1A CN104998513B (en) | 2015-07-21 | 2015-07-21 | Carbon dioxide rectifying emission-reducing process and device |
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| CN201510429035.1A CN104998513B (en) | 2015-07-21 | 2015-07-21 | Carbon dioxide rectifying emission-reducing process and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114984603A (en) * | 2022-05-16 | 2022-09-02 | 上海蕙黔化工科技有限公司 | Distillation separation equipment for gas-phase carbonyl synthesis dimethyl carbonate process |
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| CN202133231U (en) * | 2011-06-29 | 2012-02-01 | 苏州市兴鲁空分设备科技发展有限公司 | Carbon dioxide purification device |
| CN103277980A (en) * | 2013-06-13 | 2013-09-04 | 东南大学 | Carbon dioxide capture device utilizing both part oxygen-enriched combustion and nitrogen-and-oxygen separation |
| CN103274406A (en) * | 2013-06-13 | 2013-09-04 | 东南大学 | Novel carbon dioxide trapping device performing liquefaction and then sublimation |
| CN104592012A (en) * | 2015-02-11 | 2015-05-06 | 上海方纶新材料科技有限公司 | Continuous production method and device for chloroformyl substituted benzenes |
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2015
- 2015-07-21 CN CN201510429035.1A patent/CN104998513B/en active Active
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| CN1031190A (en) * | 1988-06-06 | 1989-02-22 | 天津大学 | The rectificating method of high-solidification point mixture and device thereof |
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| CN103277980A (en) * | 2013-06-13 | 2013-09-04 | 东南大学 | Carbon dioxide capture device utilizing both part oxygen-enriched combustion and nitrogen-and-oxygen separation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114984603A (en) * | 2022-05-16 | 2022-09-02 | 上海蕙黔化工科技有限公司 | Distillation separation equipment for gas-phase carbonyl synthesis dimethyl carbonate process |
| CN114984603B (en) * | 2022-05-16 | 2024-02-27 | 上海蕙黔新材料科技有限公司 | Distillation separation equipment for gas-phase oxo-synthesis process of dimethyl carbonate |
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