CN108970361A - A method of utilizing the efficient collecting carbon dioxide from fuel gas of potassium carbonate - Google Patents
A method of utilizing the efficient collecting carbon dioxide from fuel gas of potassium carbonate Download PDFInfo
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- CN108970361A CN108970361A CN201810688810.9A CN201810688810A CN108970361A CN 108970361 A CN108970361 A CN 108970361A CN 201810688810 A CN201810688810 A CN 201810688810A CN 108970361 A CN108970361 A CN 108970361A
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- carbon dioxide
- potassium carbonate
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- flue gas
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/306—Alkali metal compounds of potassium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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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
- 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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Abstract
The present invention relates to technical field of energy saving and environmental protection, in particular to a kind of method using the efficient collecting carbon dioxide from fuel gas of potassium carbonate.(1) flue gas is handled；(2) temperature of flue gas is adjusted to that gas-liquid two-phase then occurs in absorption tower with carbon dioxide lean solution and contacts not higher than 50 DEG C；(3) carbon dioxide lean solution is made to be changed into carbon dioxide rich solution；(4) carbon dioxide rich solution is introduced into heating device and heated, continue absorbing carbon dioxide after circulation；(5) carbon dioxide collection is stored.1, present invention process is simple and easy, and use cost is low, can utilize the absorption for carrying out carbon dioxide of both having ready conditions using power plant, steel mill.2, present invention process is novel, can be realized solution of potassium carbonate recycling, saves cost；3, the technique for entirely collecting carbon dioxide realizes that waste utilization protects environment without consuming coal and calcium carbonate compared with existing production technology.
Description
(1) technical field
It is the present invention relates to technical field of energy saving and environmental protection, in particular to a kind of using the efficient collecting carbon dioxide from fuel gas of potassium carbonate
Method.
(2) background technique
Carbon dioxide is main greenhouse gases.Because carbon dioxide has the function of heat preservation, it can gradually make earth surface temperature
It increases.Nearly 100 years, Global Temperature increased 0.6 DEG C, went down after this manner, it is contemplated that arrives mid-21st Century, Global Temperature will increase
1.5—4.5℃.The sea-level rise as caused by greenhouse effects also can generate tremendous influence to the living environment of the mankind.When
Focus on very much the discharge of control carbon dioxide while developing the economy in lower various countries；Wherein, carbon dioxide is trapped and is stored up
Depositing is considered as the most effective means for reducing greenhouse effects.Unfortunately, although being carried out to collecting carbonic anhydride and storage
A large amount of research, but currently, a small number of enterprises only in a few countries can carry out carbon dioxide caused by coal-fired, combustion gas
It collects and stores.Equally, most relevant enterprises in China are not engaged in the work of this respect.
The industrialization collecting carbonic anhydride method of current comparative maturity is MEA process, that is, uses monoethanolamine as medium, come
Carbon dioxide in absorption and desorption flue gas.Although the method technology and technical maturity, there is also the high costs of hydramine, hydramine for it
Effumability, hydramine is degradable in operation, running equipment needs special corrosion-resistant protection and carbon dioxide from hydramine
The weakness such as the high energy consumption of desorption.
(3) summary of the invention
In order to compensate for the shortcomings of the prior art, the present invention provides a kind of using the efficient collecting carbon dioxide from fuel gas of potassium carbonate
Method.
The present invention is achieved through the following technical solutions:
A method of utilizing the efficient collecting carbon dioxide from fuel gas of potassium carbonate, it is characterised in that: the following steps are included:
(1) first time cooling is carried out to the flue gas in flue；
(2) flue gas is purified, flue gas carries out second and cools down while purification；
(3) (1), (2) step are adjusted, flue-gas temperature is kept to be not higher than 50 DEG C；
(4) carbon dioxide lean solution is prepared, and is introduced into absorption tower；
(5) purified flue gas is introduced into absorption tower, so that it is in contact with the completion of carbon dioxide lean solution, carbon dioxide lean solution
The carbon dioxide absorbed in flue gas forms carbon dioxide rich solution；
(6) carbon dioxide rich solution is introduced into heating device and heated, the saleratus decomposition in carbon dioxide rich solution releases two
The step of carbonoxide, at the same time, carbon dioxide rich solution are changed into carbon dioxide lean solution, and subsequent cycle is used as after cooling (4), after
Continuous absorbing carbon dioxide；
(7) carbon dioxide in collection step (6).
Further, the temperature of flue gas is not higher than 40 DEG C in step (3).
Further, the concentration of solution of potassium carbonate described in step (4) is no more than 1.2mol/L.
Further, first time drop is carried out to the flue gas in flue by the heat exchanger being arranged on gas flue in step (1)
Temperature.
Further, gas cleaning includes flue-gas wet dust removal, smoke-gas wet desulfurization and flue gas wet denitration.
Further, the absorption tower is spray absorption tower.
Further, heating device described in step (6) is plate heat exchanger.
Further, the heat source of heating device described in step (6) is fume afterheat.
Carbon dioxide lean solution refers to that solution of potassium carbonate, carbon dioxide rich solution refer to that potassium bicarbonate solution and a small amount of potassium carbonate are molten
The mixture of liquid.
The present invention does not use monoethanolamine as medium, carrys out the carbon dioxide in absorption and desorption flue gas, in this technique
Potassium carbonate repeats absorbing carbon dioxide, becomes saleratus, and potassium bicarbonate aqueous solution is unstable, with the raising of temperature, decomposes
For potassium carbonate, water and carbon dioxide is released, realizes recycling.In the prior art, there has been no techniques can utilize the technology
The trapping of carbon dioxide is carried out, also, the technique is not high to saleratus heating required temperature, is fully able to utilize flue gas sheet
The waste heat of body heats.This method by twice cooling so that, flue-gas temperature is easier to control, and is conducive to solution of potassium carbonate to two
The absorption of carbonoxide；The technique can either reach production carbon dioxide purpose, and can utilize to fume afterheat, greatly save
The energy is saved.
It is tested for absorptivity of the solution of potassium carbonate to carbon dioxide:
Experiment condition: nitrogen, carbon dioxide gas, the solution of potassium carbonate of 1mol, carbon dioxide detector, absorption liquid bath etc..
The mixed gas that carbon dioxide volume ratio is 30% is passed through in the absorption liquid bath equipped with solution of potassium carbonate, dioxy is used
Change the content for the carbon dioxide that the measurement of carbon detector is overflowed, as a result as shown in Table 1 are as follows:
It is obtained from one experimental data of table, the ability of solution of potassium carbonate absorbing carbon dioxide is increased with temperature and increased.
For the resolution ratio of potassium bicarbonate solution at different temperatures:
Experiment condition: water-bath, thermometer, acidometer, dilute sulfuric acid, methyl orange reagent, phenolphthalein reagent etc..
Configure 1mo/L saturated solution potassium bicarbonate solution, heating water bath, respectively at 30 DEG C, 40 DEG C, 50 DEG C, 60 DEG C, 70
DEG C, 80 DEG C, by measuring and calculating carbonate, bicarbonate concentration, to obtain saleratus resolution ratio.
As a result as shown in Table 2 are as follows:
Resolution ratio is lower when potassium bicarbonate solution is in 60 DEG C, starts to decompose rapidly after 70 DEG C.
In conjunction with above-mentioned experiment, conclusion is analyzed are as follows: potassium carbonate should be at 50 DEG C or less to the absorption of carbon dioxide；Work as bicarbonate
When potassium solution is more than 60 DEG C, carbon dioxide can be largely released.
It is tested for the absorptivity of various concentration solution of potassium carbonate:
Experiment condition: nitrogen, the solution of potassium carbonate of various concentration, carbon dioxide detector, absorbs liquid bath at carbon dioxide gas
Deng.
The mixed gas that carbon dioxide volume ratio is 30% is passed through in the absorption liquid bath equipped with solution of potassium carbonate, dioxy is used
Change the content for the carbon dioxide that the measurement of carbon detector is overflowed, as a result as shown in Table 3 are as follows:
Conclusion is, from the point of view of assimilation effect, the concentration of potassium carbonate influences less, to consider the dissolution of product potassium bicarbonate solution
Degree, for the crystallisation problems of prevention saleratus in process, it is proposed that the molar concentration of solution of potassium carbonate answers≤4.5mol/L.
The beneficial effects of the present invention are:
1, present invention process is simple and easy, and use cost is low, can carry out carbon dioxide using both having ready conditions using power plant, steel mill
Absorption.
2, present invention process is novel, can be realized solution of potassium carbonate recycling, saves cost；
3, the technique for entirely collecting carbon dioxide realizes waste utilization, without consuming coal and carbon compared with existing production technology
Sour calcium, protects environment.
(4) specific embodiment
Embodiment 1:
The following steps are included:
(1) first time cooling is carried out to the flue gas in flue；
(2) flue gas is purified, flue gas carries out second and cools down while purification；
(3) temperature of treated flue gas is adjusted 50 DEG C, the temperature adjustment mode of flue gas is that heat exchanger exchanges heat or water washing
Mode；Then gas-liquid two-phase occurs in absorption tower with carbon dioxide lean solution to contact, carbon dioxide lean solution absorbs two in flue gas
Carbonoxide；The concentration of the solution of potassium carbonate is 4.5mol/L；
(4) carbon dioxide lean solution absorbs the carbon dioxide formation carbon dioxide rich solution in flue gas；
(5) carbon dioxide rich solution is introduced into heating device and heated, the saleratus decomposition in carbon dioxide rich solution releases two
Carbonoxide, at the same time, carbon dioxide rich solution are changed into carbon dioxide lean solution, which is recycled into absorption tower,
Continue absorbing carbon dioxide；
(6) carbon dioxide collection for separating step (5) stores.
Wherein, the absorption tower is spray absorption tower.
Wherein, heating device described in step (5) is plate heat exchanger.
Wherein, the heat source of heating device described in step (5) is fume afterheat.
Embodiment 2:
The following steps are included:
(1) first time cooling is carried out to the flue gas in flue；
(2) flue gas is purified, flue gas carries out second and cools down while purification；
(3) temperature of treated flue gas is adjusted 45 DEG C, the temperature adjustment mode of flue gas is that heat exchanger exchanges heat or water washing
Mode；Then gas-liquid two-phase occurs in absorption tower with carbon dioxide lean solution to contact, carbon dioxide lean solution absorbs two in flue gas
Carbonoxide；The concentration of the solution of potassium carbonate is 4.5mol/L；
(4) carbon dioxide lean solution absorbs the carbon dioxide formation carbon dioxide rich solution in flue gas；
(5) carbon dioxide rich solution is introduced into heating device and heated, the saleratus decomposition in carbon dioxide rich solution releases two
Carbonoxide, at the same time, carbon dioxide rich solution are changed into carbon dioxide lean solution, which is recycled into absorption tower,
Continue absorbing carbon dioxide；
(6) carbon dioxide collection for separating step (5) stores.
Wherein, the absorption tower is spray absorption tower.
Wherein, heating device described in step (5) is plate heat exchanger.
Wherein, the heat source of heating device described in step (5) is fume afterheat.
Embodiment 3:
The following steps are included:
(1) first time cooling is carried out to the flue gas in flue；
(2) flue gas is purified, flue gas carries out second and cools down while purification；
(3) temperature of treated flue gas is adjusted 38 DEG C, the temperature adjustment mode of flue gas is that heat exchanger exchanges heat or water washing
Mode；Then gas-liquid two-phase occurs in absorption tower with carbon dioxide lean solution to contact, carbon dioxide lean solution absorbs two in flue gas
Carbonoxide；The concentration of the solution of potassium carbonate is 4.5mol/L；
(4) carbon dioxide lean solution absorbs the carbon dioxide formation carbon dioxide rich solution in flue gas；
(5) carbon dioxide rich solution is introduced into heating device and heated, the saleratus decomposition in carbon dioxide rich solution releases two
Carbonoxide, at the same time, carbon dioxide rich solution are changed into carbon dioxide lean solution, which is recycled into absorption tower,
Continue absorbing carbon dioxide；
(6) carbon dioxide collection for separating step (5) stores.
Wherein, the absorption tower is spray absorption tower.
Wherein, heating device described in step (5) is plate heat exchanger.
Wherein, the heat source of heating device described in step (5) is fume afterheat.
Embodiment 4:
The following steps are included:
(1) first time cooling is carried out to the flue gas in flue；
(2) flue gas is purified, flue gas carries out second and cools down while purification；
(3) temperature of treated flue gas is adjusted 32 DEG C, the temperature adjustment mode of flue gas is that heat exchanger exchanges heat or water washing
Mode；Then gas-liquid two-phase occurs in absorption tower with carbon dioxide lean solution to contact, carbon dioxide lean solution absorbs two in flue gas
Carbonoxide；The concentration of the solution of potassium carbonate is 4.5mol/L；
(4) carbon dioxide lean solution absorbs the carbon dioxide formation carbon dioxide rich solution in flue gas；
(5) carbon dioxide rich solution is introduced into heating device and heated, the saleratus decomposition in carbon dioxide rich solution releases two
Carbonoxide, at the same time, carbon dioxide rich solution are changed into carbon dioxide lean solution, which is recycled into absorption tower,
Continue absorbing carbon dioxide；
(6) carbon dioxide collection for separating step (5) stores.
Wherein, the absorption tower is spray absorption tower.
Wherein, heating device described in step (5) is plate heat exchanger.
Wherein, the heat source of heating device described in step (5) is fume afterheat.
Embodiment 5:
The following steps are included:
(1) first time cooling is carried out to the flue gas in flue；
(2) flue gas is purified, flue gas carries out second and cools down while purification；
(3) temperature of treated flue gas is adjusted 20 DEG C, the temperature adjustment mode of flue gas is that heat exchanger exchanges heat or water washing
Mode；Then gas-liquid two-phase occurs in absorption tower with carbon dioxide lean solution to contact, carbon dioxide lean solution absorbs two in flue gas
Carbonoxide；The concentration of the solution of potassium carbonate is 4.5mol/L；
(4) carbon dioxide lean solution absorbs the carbon dioxide formation carbon dioxide rich solution in flue gas；
(5) carbon dioxide rich solution is introduced into heating device and heated, the saleratus decomposition in carbon dioxide rich solution releases two
Carbonoxide, at the same time, carbon dioxide rich solution are changed into carbon dioxide lean solution, which is recycled into absorption tower,
Continue absorbing carbon dioxide；
(6) carbon dioxide collection for separating step (5) stores.
Wherein, the absorption tower is spray absorption tower.
Wherein, heating device described in step (5) is plate heat exchanger.
Wherein, the heat source of heating device described in step (5) is fume afterheat.
Claims (8)
1. a kind of method using the efficient collecting carbon dioxide from fuel gas of potassium carbonate, it is characterised in that: the following steps are included: (1)
First time cooling is carried out to the flue gas in flue；(2) flue gas is purified, flue gas carries out second and drops while purification
Temperature；(3) (1), (2) step are adjusted, flue-gas temperature is kept to be not higher than 50 DEG C；(4) carbon dioxide lean solution is prepared, and is introduced into suction
Receive tower；(5) purified flue gas is introduced into absorption tower, so that it is in contact with the completion of carbon dioxide lean solution, carbon dioxide is poor
Liquid absorbs the carbon dioxide in flue gas and forms carbon dioxide rich solution；(6) carbon dioxide rich solution is introduced into heating device and heated, two
Saleratus decomposition in carbonoxide rich solution releases carbon dioxide, and at the same time, carbon dioxide rich solution is changed into carbon dioxide
Lean solution, after cooling be used as subsequent cycle the step of (4), continue absorbing carbon dioxide；(7) carbon dioxide in collection step (6).
2. the method according to claim 1 using the efficient collecting carbon dioxide from fuel gas of potassium carbonate, it is characterised in that: step
Suddenly the temperature of flue gas is not higher than 40 DEG C in (3).
3. the method according to claim 1 using the efficient collecting carbon dioxide from fuel gas of potassium carbonate, it is characterised in that: step
Suddenly the concentration of solution of potassium carbonate described in (4) is no more than 1.2mol/L.
4. the method according to claim 1 using the efficient collecting carbon dioxide from fuel gas of potassium carbonate, it is characterised in that: step
Suddenly first time cooling is carried out to the flue gas in flue by the heat exchanger being arranged on gas flue in (1).
5. the method according to claim 1 using the efficient collecting carbon dioxide from fuel gas of potassium carbonate, it is characterised in that: cigarette
Gas purification includes flue-gas wet dust removal, smoke-gas wet desulfurization and flue gas wet denitration.
6. the method according to claim 1 using the efficient collecting carbon dioxide from fuel gas of potassium carbonate, it is characterised in that: institute
Stating absorption tower is spray absorption tower.
7. the method according to claim 1 using the efficient collecting carbon dioxide from fuel gas of potassium carbonate, it is characterised in that: step
Suddenly heating device described in (6) is plate heat exchanger.
8. the method according to claim 1 using the efficient collecting carbon dioxide from fuel gas of potassium carbonate, it is characterised in that: step
Suddenly the heat source of heating device described in (6) is fume afterheat.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102895860A (en) * | 2012-09-29 | 2013-01-30 | 华北电力大学 | Method and system for reducing consumption in capturing process of CO2 through chemical absorption |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102895860A (en) * | 2012-09-29 | 2013-01-30 | 华北电力大学 | Method and system for reducing consumption in capturing process of CO2 through chemical absorption |
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Application publication date: 20181211 |