CN103301729A - Apparatus and method for recovering energy after carbon dioxide capture - Google Patents

Apparatus and method for recovering energy after carbon dioxide capture Download PDF

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Publication number
CN103301729A
CN103301729A CN2012102808305A CN201210280830A CN103301729A CN 103301729 A CN103301729 A CN 103301729A CN 2012102808305 A CN2012102808305 A CN 2012102808305A CN 201210280830 A CN201210280830 A CN 201210280830A CN 103301729 A CN103301729 A CN 103301729A
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carbon dioxide
energy
pressure
turbine
absorbent
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朴相镇
李起春
郑圣烨
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Hyundai Motor Co
Kia Corp
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Hyundai Motor Co
Kia Motors Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/343—Heat recovery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/50—Carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C1/00—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid
    • F02C1/02—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid the working fluid being an unheated pressurised gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • 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
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

Disclosed are an apparatus and a method for recovering energy after carbon dioxide capture. The apparatus includes an energy recovery unit at a discharge part of a carbon dioxide capturing apparatus through which captured carbon dioxide is discharged. The energy recovery unit reduces a discharge pressure of the carbon dioxide to a pressure level suitable for a fixation or conversion treatment, and simultaneously generates and recovers energy generated during the pressure reduction.

Description

Catch the apparatus and method that recover energy behind the carbon dioxide
Technical field
The present invention relates to a kind of apparatus and method that after catching carbon dioxide, recover energy.More specifically, the present invention relates to a kind of apparatus and method that recover energy after catching carbon dioxide, it can when the carbon dioxide of catching by for example method processing fixing or that transform, recover energy from the CO2 emission pressure of catching.
Background technology
Usually, comprise absorption process, absorption method, and membrane separation process for the method for catching carbon dioxide.Compare with membrane separation process with absorption method, absorption process can be processed large quantity of exhaust gas, even and at CO 2Concentration conditions is approximately 7% to about 30% situation, and the high efficient of removing also can be provided.In addition, absorption process has higher economic benefit and is easy to application.
After catching, then can storing carbon dioxide, maybe can process by fixing and method for transformation.Wherein, compare with other processing methods, even a large amount of CO is arranged 2, store CO at underground or deep-sea 2Method also be easy to.The at present available and commercialization of this storage method.Yet, store CO at underground or deep-sea 2Cost high, and can not fundamentally remove the CO of storage 2, cause being difficult to extra profit.
Utilize CO 2As carbon source with the CO that catches 2Change into other chemical substances, and utilize plant and marine alga fixation of C O 2Method all study.If these methods reach commercialization stage, can fundamentally remove CO 2, and the useful products that produces can additionally be made a profit.Therefore, these methods are assessed as more economical, preferred technology.
In catching the absorption process of carbon dioxide, chemical absorption method at present research is the most extensive.In chemical absorption method, by chemical reaction Selective Separation CO from waste gas 2By chemical absorbing, uptake can obviously not be subject to CO 2The impact of dividing potential drop.Therefore, advantage is, even if at CO 2Divide when forcing down CO 2Remove efficient still higher.Yet, because at subsequently CO 2High with required energy consumption in the removal process that absorbent separates, so that chemical absorption method is limited.For example, the energy consumption that becomes known for reclaiming accounts for CO 2Total CO of acquisition equipment 2Reclaim to consume approximately 60% or more.Particularly, become known for CO 2The energy consumption of separating with absorbent in the recovery tower accounts for CO 2Reclaim approximately 80% of energy consumption, and service procedure equipment for example the energy consumption of pump account for CO 2Reclaim approximately 20% of energy consumption.
Therefore, need a kind of improved absorption techniques to be used for catching carbon dioxide, the energy that consumes during wherein absorbent reclaims reduces, thereby reduces the cost of collecting carbon dioxide.
Below, a kind of typical carbon dioxide capture operation will briefly be described.
As shown in Figure 2, contain CO 2Waste gas supply to absorption tower 10, it has wide surf zone and is used for carrying out smoothly gas-liquid contact, and it is filled with filler.
In this case, liquid-absorbant supplies to the top on absorption tower 10 from absorbent storage tank 12, and waste gas supplies to the bottom on absorption tower 10.Under the atmospheric pressure, 10 upper end contacts with liquid-absorbant (absorption liquid) waste gas on the absorption tower, so that absorption liquid can absorb the CO in the waste gas 2, usually in 40 ℃-70 ℃ temperature range.
Absorbed CO 2Absorbent 10 discharge from the absorption tower, and be fed to recovery tower 14 experience removal process, wherein absorbent is heated to 100 ℃-160 ℃ temperature.After this, absorbent is discharged the (" CO that used from the bottom of recovery tower 14 2Absorbent "), and feed again in the absorption tower 10 by absorbent supply line 22.
The absorbent that is fed to again absorption tower 10 is heated by heat exchanger 16.As shown in the figure, the absorbent that newly supplies to recovery tower 14 from absorbent storage tank 12 can carry out heat exchange and be preheated by the absorbent with the heat of supplying again from the bottom of recovery tower 14.The absorbent of the heat of this merging is fed to the top of recovery tower 14 subsequently.
During removal process, absorbent is heated to 100 ℃-160 ℃ temperature, the absorbent of evaporation and CO in recovery tower 14 2Discharge from the top of recovery tower 14.With CO 2Absorbent discharge from the bottom of recovery tower 14, and be heated to 100 ℃-160 ℃ temperature range such as boiler by heater 18, thus from absorbent separation of C O 2
Isolated CO in recovery tower 14 2Be discharged to storage, fixing and conversion place by condenser, and then adsorbent condensation in condenser 20 of evaporation is back in the recovery tower 14.
The CO that in recovery tower 14, separates 2The gaseous state CO of high concentration 2(90%-100%), and discharge from recovery tower 14 under the pressure limit of 1.9atm-6atm, final process stores, fixes or method for transformation is processed.
In order to store the CO that catches at underground or deep-sea 2, from the high concentration CO of recovery tower 14 upper ends discharging 2Pressure, must be increased to approximately 70atm to the about high pressure of 100atm.In order to increase pressure, need extra energy.
On the other hand, as the CO that catches 2Directly through fixing or conversion but not stores processor, can under 1.2atm only or lower pressure, process the CO that catches 2, thereby, need not to use compressor to increase CO 2The process of pressure.
Above-mentionedly only be used for to strengthen understanding to background of the present invention in the disclosed information of this background technology part, so it may contain the information that does not consist of the prior art that those of ordinary skills have known in this state.
Summary of the invention
The invention provides a kind of apparatus and method that recover energy after catching carbon dioxide, it is with the CO that catches 2Blowdown presssure drop to fixing or transform required pressure.Described apparatus and method also simultaneously produce power (for example, with generator that turbine is connected in), wherein, by CO fixing or that conversion is caught 2Produce power, but not with the CO that catches 2Be stored in underground or the deep-sea in.The energy that produces like this can supply to the processing operating unit of apparatus of the present invention, and therefore, can be used for any operating unit to catch CO 2
On the one hand, the invention provides a kind of device that after catching carbon dioxide, recovers energy, comprise the energy recovery unit at the CO2 emission section place that is positioned at the carbon dioxide capture device, wherein energy recovery unit is reduced to the stress level that is suitable for fixing or conversion processing with the blowdown presssure of carbon dioxide.According to different embodiments, the energy that produces between pressure reducing period can be reclaimed by energy recovery unit simultaneously.
In an exemplary embodiment, energy recovery unit can be connected with one or more processing operating units of carbon dioxide capture device, thereby provides the electric energy that reclaims to the processing operating unit of expectation.
In another exemplary embodiment, energy recovery unit can comprise: be arranged in the turbine at condensator outlet place, wherein condensator outlet is the discharge portion of carbon dioxide capture device; And generator links to each other with turbine.
On the other hand, the invention provides a kind of method that after catching carbon dioxide, recovers energy, comprising: by the carbon dioxide capture device, from waste gas, catch carbon dioxide; By the carbon dioxide capture device carbon dioxide of catching is discharged; The blowdown presssure of the carbon dioxide that gives off is reduced to is suitable for being fixed or the stress level of conversion processing; And be recovered in the energy that produces between pressure reducing period.
In an illustrative embodiments, the method also comprises, with the Power supply that the reclaims processing operating unit to one or more expectations of carbon dioxide capture device, and the energy that is reclaimed with utilization.
In another illustrative embodiments, energy reclaims and can comprise: utilize the blowdown presssure of the carbon dioxide that the carbon dioxide capture device catches to make the turbine rotation; Will be through the final blowdown presssure of the carbon dioxide of turbine, constantly be reduced to and be suitable for being fixed or the stress level of conversion processing; And carry the revolving force of turbine to the generator that links to each other with turbine, so that the generator produce power.
In another illustrative embodiments, when the blowdown presssure of the carbon dioxide of being caught by the carbon dioxide capture device when about 1.8atm is in the scope of about 6atm, the final blowdown presssure of the carbon dioxide by turbine can drop to and be lower than about 1.8atm, is lower than about 1.6atm, is lower than the pressure of about 1.4atm or the about pressure of 1.2atm, and it is suitable for being fixed or conversion processing.
Hereinafter other aspects of the present invention and illustrative embodiments will be discussed.
Description of drawings
Above and other feature of the present invention is described in detail with reference to illustrated some illustrative embodiments of accompanying drawing, and these embodiments that hereinafter provide only are used for the example explanation, are not limitations of the present invention therefore, wherein:
Fig. 1 is the figure that illustrates according to the device that recovers energy after catching carbon dioxide of embodiment of the present invention; And
Fig. 2 is the figure that typical carbon dioxide capture device is shown.
The Reference numeral of mentioning in the accompanying drawings comprises the reference to the following element of further discussing hereinafter:
10: the absorption tower
12: the absorbent storage tank
14: recovery tower
16: heat exchanger
18: heater
20: condenser
22: the absorbent supply line
30: energy recovery unit
32: turbine
34: generator
Should be appreciated that appended accompanying drawing is not must be pro rata, and just present the reduced representation to a certain degree of the various preferred features that basic principle of the present invention is described.Specific design feature of the present invention disclosed herein comprises, for example, concrete size, direction, position and shape will depend in part on specific set purposes and environment for use.
In the accompanying drawings, Reference numeral refers to identical or equivalent elements of the present invention in the whole text in several figure of accompanying drawing.
The specific embodiment
The below will be at length with reference to each embodiment of the present invention, and embodiment illustrates in the accompanying drawings, and is described hereinafter.Although describe the present invention in connection with illustrative embodiments, should be appreciated that this specification has no intention to limit the invention to these illustrative embodiments.On the contrary, the present invention not only will be contained these illustrative embodiments, also will contain various alternative forms, modification, equivalents and other embodiment in the spirit and scope of the present invention that limited by claims.
Should understand, term used herein " vehicle " or " vehicle " or other similar terms comprise common motor vehicle, for example, the passenger vehicle that comprises Multifunctional bicycle (SUV), bus, truck, various commercial vehicles, the water carrier that comprises various ships and boats and ships, aircraft etc., and comprise PHEV, electric motor car, plug-in hybrid electric vehicles, hydrogen-powered vehicle and other substitute fuel car (for example, deriving from the fuel of oil resource in addition).As mentioned in this article, PHEV is the vehicle with two or more power sources, for example, has petrol power and electrodynamic vehicle.
The below discusses above and other feature of the present invention.
Below, describe with reference to the accompanying drawings illustrative embodiments of the present invention in detail.
The invention provides a kind of apparatus and method, it is by reducing CO 2Cost absorption particularly improves CO by reducing energy consumption 2The business efficiency of catching.
According to the present invention, with CO 2Acquisition equipment is designed to, with CO 2After blowdown presssure is reduced to the stress level that is suitable for fixing or conversion processing, with the CO that catches 2Discharge wherein recovers energy between pressure reducing period to transform or to fix, and with the Power supply CO that reclaims 2One or more processing units of acquisition equipment.
As shown in Figure 1, according to an illustrative embodiments, energy recovery unit 30 can be arranged on CO 2CO that acquisition equipment is caught 2Exhaust position around.For example, energy recovery unit 30 can be arranged on the outlet side of condenser 20, this condenser and CO 2The recovery tower 14 of acquisition equipment links to each other.
Work as CO 2The CO that catches in the acquisition equipment 2During from the outlet of condenser 20 discharging, can configure or arrange energy recovery unit 30, with CO 2Blowdown presssure drops to and is suitable for being fixed or the stress level of conversion processing, and is recovered in the energy that produces between pressure reducing period.
More specifically, can comprise the turbine 32 that is arranged on condenser 20 exits according to the energy recovery unit 30 of one embodiment of the present invention, this outlet is CO 2The discharge portion of acquisition equipment.Generator 34 can be set to link to each other with turbine 32, for example, with concentric manner generator 34 is connected to turbine 32 or adopts other suitable mounting means.
The generator 34 of energy recovery unit 30 can with CO 2One or more processing operating units of acquisition equipment (for example, the pump that arranges in each acquisition procedure and air blast, it is driven by electric energy usually) link to each other, in order to being supplied with each, the electric energy that produces processes operating unit.
Below, will be to catching CO according to embodiment of the present invention 2After the method that recovers energy carry out following description.
As shown in Figure 1, can CO will be contained 2Waste gas be fed in the absorption tower 10, absorbent, liquid-absorbant normally can supply to from absorbent storage tank 12 top on absorption tower 10.
In absorption tower 10 (for example, 10 the top on the absorption tower), usually under atmospheric pressure, the waste gas that is fed in the absorption tower 10 can contact the CO in the waste gas with liquid-absorbant (absorption liquid) 2Can be absorbed agent absorbs.
Absorbed CO 2The absorbent (" CO that used 2Absorbent ") 10 discharges from the absorption tower, and be fed to recovery tower 14, then, here it can experience removal process.Particularly, in removal process, absorbent is heated to suitable temperature (according to appointment 100 ℃ to approximately 160 ℃ temperature) recovery tower 14 is interior.
The absorbent that reclaims in the removal process is discharged from recovery tower 14 bottoms, then can be fed to absorption tower 10 by the absorbent supply line 22 that connects absorbent storage tank 12 and absorption tower 10 again.
As shown, the absorbent of supply is by heat exchanger 16 again, and subsequently with the CO of the 10 new supplies from the absorption tower 2Absorbent merges.The CO that like this, newly provides 2Absorbent can carry out heat exchange by the absorbent that again feeds with heat and be preheated, and the absorbent that merges (absorbent that newly provides and the absorbent of again supplying) can supply to the top of recovery tower 14 subsequently.
In removal process, absorbent is heated to suitable temperature, 100 ℃ to about 160 ℃ temperature, the absorbent of evaporation and CO according to appointment 2Can discharge from the top of recovery tower 14.In addition, liquid-absorbant and CO 2Can discharge from the bottom of recovery tower 14, can be heated in the suitable temperature range by heater 18 (such as boiler etc.), 100 ℃ of extremely about temperature of 160 ℃ according to appointment so that from absorbent separation of C O 2
The CO that from recovery tower 14, separates 2, namely with the CO of absorbent of evaporation 2, can be discharged into condenser 20.The absorbent of condensation can be fed in the recovery tower 14 from condenser again, and the CO that separates 2Can be discharged into and be fixed or the place of conversion processing.
As the CO that separates 2Be discharged to from condenser 20 and be fixed or during the place of conversion processing CO 2Pressure can be at about 1.8atm to the scope of about 6atm.Fix or the required suitable CO of conversion processing 2Blowdown presssure can be less than this blowdown presssure, for example, can be less than 1.8atm, less than 1.6atm, less than 1.4atm, and in some embodiments, it can be about 1.2atm.
As shown in the embodiment of Fig. 1, the pressure of discharging from condenser 20 be approximately 1.8atm to the about CO of the separation of 6atm 2, by the turbine 32 of energy recycle device 30.The CO that is separating 2During by turbine, can make turbine 32 rotations, and the revolving force of turbine 32 can flow to generator 34.
CO when the separation of discharging from condenser 20 2During by turbine 32, CO 2Pressure can be reduced to and be suitable for being fixed or the stress level of conversion processing.Particularly, according to illustrative embodiments, the CO of separation 2Discharge from condenser 20, pressure is that approximately 1.8atm is to about 6atm, and it is by turbine 32, CO in turbine 32 2Pressure constantly or continuously be reduced to as required the stress level that is suitable for fixing or conversion processing.
For example, the CO by turbine 32 2Final blowdown presssure, can be reduced to the approximately pressure of 1.2atm, this is the pressure that is suitable for carrying out follow-up fixing or conversion processing.
Along with CO 2By turbine and its pressure decreased, the revolving force of turbine 32 can flow to generator 34, makes generator 34 produce powers.The electric energy that produces in the generator 34 can supply to and be consumed in CO 2In one or more processing operating units of acquisition equipment (as pump and air blast of being arranged in each acquisition procedure and being driven by electric energy).
Therefore, be used as drive CO by the electric energy that will in the generator 34 of energy recovery unit 30, produce 2The energy of one or more processing operating units of acquisition equipment can obviously be reduced to operation CO 2Acquisition equipment and the amount of energy that must supply, and cost-saved.
As test case of the present invention, utilize process-simulation program to carry out energy and reclaim test, wherein CO 2(removal) amount of catching is about 1000 ton per days.Following table 1 illustrates CO 2The absorption technique condition.
Table 1
Air-flow-liquid flowing ratio 125 150 175 200 225
The flow rate of waste gas, m 3/min 2,125.6 2,125.6 2,125.6 2,125.6 2,125.6
CO 2Concentration, mol% 20 20 20 20 20
The flow rate of absorbent, m 3/min 17.0 14.2 12.1 10.7 9.4
MEA concentration in the absorption tower, wt% 35 35 35 35 35
Following table 2 illustrates the power consumption kW of the reboiler (heater 18 that for example, links to each other with recovery tower 14 bottoms) under each air-flow-liquid flowing ratio and the CO that discharges from condenser 2The flow rate of gas.
Table 2
Air-flow-liquid flowing ratio 125 150 175 200 225
CO 2Removal amount, ton per day 1,000 1,000 1,000 1,000 1,000
The energy that uses in the absorption pump, kW 697.2 577.2 489.8 425.0 376.0
CO from the condenser discharge 2Flow rate, m 3/min 77.95 79.50 80.88 81.97 83.50
CO from the condenser discharge 2Pressure, atm 4.41 4.32 4.25 4.20 4.12
Following table 3 illustrates according to above-mentioned test condition passes through the energy-producing analog result of turbine under each air-flow-liquid flowing ratio.
Table 3
Figure BSA00000761331500081
As shown in table 3, no matter wet method or dry method flow, the CO in the input turbine 2Pressure at about 4.12atm to the scope of about 4.41atm, and enter the CO of fixing or conversion treatment device by turbine 2Pressure constantly is reduced to approximately 1.2atm.And the energy that produces along with generator increases CO corresponding to turbine efficiency 2Energy used in the absorption pump of acquisition equipment reduces.
According to the embodiment of the present invention, work as CO 2The CO that acquisition equipment is caught 2Processing instead through fixing or conversion processing method, lower or deep-sea stores CO 2Method the time, CO 2The CO that acquisition equipment is caught 2Blowdown presssure can be reduced to and be fixed or pressure that conversion processing is required.Can energy recovery unit be set to from the step-down process, generate energy, particularly, the CO that wherein catches 2The turbine that is passed through is set to, so that the revolving force of turbine can flow to generator to obtain the energy recovering effect, therefrom produces electric energy.
And, because can be used as, the electric energy that produces in the generator drives CO 2Each of acquisition equipment processed the energy of operating unit (for example pump and air blast), can obviously save as running gear and catch CO 2And required energy (being the Extra Supply energy).
Describe the present invention in detail with reference to its illustrative embodiments.Yet those skilled in the art will appreciate that can be in the situation that do not depart from principle of the present invention and spirit makes a change these embodiments, and scope of the present invention is limited by appended claim and equivalent way thereof.

Claims (11)

1. one kind is used for the device recover energy after carbon dioxide capture, the energy recovery unit that comprises the discharge portion place that is positioned at the carbon dioxide capture device, described discharge portion is configured to the carbon dioxide catch for discharging, and wherein said energy recovery unit reduces the blowdown presssure of carbon dioxide and is recovered in simultaneously the energy that produces between pressure reducing period.
2. according to claim 1 device, wherein, blowdown presssure is reduced to and is suitable for the carbon dioxide of catching is fixed or the pressure of conversion processing.
3. according to claim 1 device, wherein, described energy recovery unit is connected with one or more processing operating units of described carbon dioxide capture device, and is configured and is arranged as the Power supply that will reclaim to one or more described processing operating units.
4. according to claim 1 device, wherein, described device also comprises the condenser that is positioned at described discharge portion place, and described energy recovery unit comprises:
Be arranged on the turbine in the exit of described condenser; With
The generator that links to each other with described turbine.
5. one kind is used for the method recover energy after carbon dioxide capture, comprising:
From waste gas, catch carbon dioxide by the carbon dioxide capture device;
Discharge the carbon dioxide of catching by described carbon dioxide capture device, the carbon dioxide that gives off has blowdown presssure;
The blowdown presssure of the carbon dioxide that gives off is reduced to is suitable for being fixed or the stress level of conversion processing; And
Be recovered in the energy that produces between pressure reducing period.
6. according to claim 5 method comprises that also the Power supply that will reclaim is to one or more processing operating units of described carbon dioxide capture device.
7. according to claim 5 method, wherein, the energy recycling step comprises:
Make the carbon dioxide that gives off flow through turbine, thereby make turbine rotate to produce revolving force by the blowdown presssure of the carbon dioxide that gives off;
The pressure that will flow through the carbon dioxide of described turbine drops to and is suitable for being fixed or the stress level of the reduction of conversion processing; And
The revolving force of described turbine is flowed to the generator that links to each other with described turbine so that in described generator produce power.
8. according to claim 7 method, wherein, when the blowdown presssure of the carbon dioxide of being caught by described carbon dioxide capture device when about 1.8atm is in the scope of about 6atm, pressure is lower than approximately 1.8atm after the reduction of carbon dioxide.
9. according to claim 8 method, wherein, pressure is lower than approximately 1.6atm after the reduction of carbon dioxide.
10. according to claim 8 method, wherein, pressure is lower than approximately 1.4atm after the reduction of carbon dioxide.
11. method according to claim 8, wherein, pressure is about 1.2atm after the reduction of carbon dioxide.
CN2012102808305A 2012-03-09 2012-07-06 Apparatus and method for recovering energy after carbon dioxide capture Pending CN103301729A (en)

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