CN108970362A - A method of utilizing carbon dioxide in sodium carbonate liquor trapping flue gas - Google Patents
A method of utilizing carbon dioxide in sodium carbonate liquor trapping flue gas Download PDFInfo
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- CN108970362A CN108970362A CN201810688936.6A CN201810688936A CN108970362A CN 108970362 A CN108970362 A CN 108970362A CN 201810688936 A CN201810688936 A CN 201810688936A CN 108970362 A CN108970362 A CN 108970362A
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- carbon dioxide
- flue gas
- sodium carbonate
- carbonate liquor
- absorption tower
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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
- B01D2251/304—Alkali metal compounds of sodium
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Gas Separation By Absorption (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to technical field of energy saving and environmental protection, in particular to a kind of method using carbon dioxide in sodium carbonate liquor trapping flue gas.(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 sodium carbonate liquor 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 to utilize titanium dioxide in sodium carbonate liquor trapping flue gas
The method of carbon.
(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
Titanium dioxide in sodium carbonate liquor trapping flue gas is utilized in order to compensate for the shortcomings of the prior art, the present invention provides a kind of
The method of carbon.
The present invention is achieved through the following technical solutions:
A method of utilizing carbon dioxide in sodium carbonate liquor trapping flue gas, it is characterised in that:
The following steps are included:
(1) flue gas containing carbon dioxide is purified；
(2) temperature of treated flue gas is adjusted to not higher than 50 DEG C；
(3) carbon dioxide lean solution is prepared, and is introduced into absorption tower；
(4) purified flue gas is introduced into absorption tower, gas-liquid two-phase then occurs in absorption tower with carbon dioxide lean solution
Chemical reaction, carbon dioxide lean solution absorb the carbon dioxide in flue gas and form carbon dioxide rich solution；
(5) carbon dioxide rich solution is introduced into heating device and heated, the sodium bicarbonate 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 (3), after
Continuous absorbing carbon dioxide；
(6) carbon dioxide collection for separating step (5) stores.
Further, the gas cleaning of step (1) includes one in the measures such as flue gas ash removal, flue gas desulfurization and denitrating flue gas
Kind or several combinations.
Further, the temperature of flue gas is not higher than 40 DEG C in step (2).
Further, the concentration of sodium carbonate liquor described in step (3) is no more than 1.2mol/L.
Further, the temperature adjustment mode of flue gas described in step (2) is heat exchanger heat exchange or water washing mode.
Further, the absorption tower is spray absorption tower.
Further, heating device described in step (5) is plate heat exchanger.
Further, the heat source of heating device described in step (5) is fume afterheat.
Carbon dioxide lean solution refers to that the sodium carbonate liquor of non-absorbing carbon dioxide, carbon dioxide rich solution refer to that sodium bicarbonate is molten
The mixture of liquid and a small amount of sodium carbonate liquor.
The present invention does not use monoethanolamine as medium, carrys out the carbon dioxide in absorption and desorption flue gas, in this technique
Sodium carbonate repeats absorbing carbon dioxide, becomes sodium bicarbonate, and sodium bicarbonate aqueous solution is unstable, with the raising of temperature, decomposes
For sodium 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 sodium bicarbonate heating required temperature, is fully able to utilize flue gas sheet
The waste heat of body heats.The technique can either reach production carbon dioxide purpose, and can utilize to fume afterheat, greatly
Save the energy.
It is tested for absorptivity of the sodium carbonate liquor to carbon dioxide:
Experiment condition: nitrogen, carbon dioxide gas, the sodium carbonate liquor 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 sodium carbonate liquor, 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 sodium carbonate liquor absorbing carbon dioxide is increased with temperature and increased.
For the resolution ratio of sodium 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 sodium 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 sodium bicarbonate resolution ratio.
As a result as shown in Table 2 are as follows:
From the experimental results, resolution ratio is lower when sodium bicarbonate solution is in 50 DEG C, starts to decompose rapidly after 50 DEG C.
In conjunction with above-mentioned experiment, conclusion is analyzed are as follows: sodium carbonate should be at 50 DEG C or less to the absorption of carbon dioxide；Work as bicarbonate
When sodium solution is more than 60 DEG C, carbon dioxide can be largely released.
It is tested for the absorptivity of various concentration sodium carbonate liquor:
Experiment condition: nitrogen, the sodium carbonate liquor 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 sodium carbonate liquor, 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 sodium carbonate influences less, to consider the dissolution of product sodium bicarbonate solution
Degree, for the crystallisation problems of prevention sodium bicarbonate in process, it is proposed that the molar concentration of sodium carbonate liquor answers≤1.2mol/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 sodium carbonate liquor 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) flue gas containing carbon dioxide is purified, including dedusting, desulphurization denitration processing；
(2) 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 chemical reaction occurs in absorption tower with carbon dioxide lean solution, carbon dioxide lean solution absorbs in flue gas
Carbon dioxide；The concentration of the sodium carbonate liquor is 1.2mol/L；
(3) carbon dioxide lean solution absorbs the carbon dioxide formation carbon dioxide rich solution in flue gas；
(4) carbon dioxide rich solution is introduced into heating device and heated, the sodium bicarbonate 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；
(5) carbon dioxide collection for separating step (4) stores.
Wherein, the absorption tower is spray absorption tower.
Wherein, heating device described in step (4) is plate heat exchanger.
Wherein, the heat source of heating device described in step (4) is fume afterheat.
Embodiment 2:
(1) flue gas containing carbon dioxide is purified, including dedusting, desulphurization denitration processing；
(2) 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 chemical reaction occurs in absorption tower with carbon dioxide lean solution, carbon dioxide lean solution absorbs in flue gas
Carbon dioxide；The concentration of the sodium carbonate liquor is 1.0mol/L；
(3) carbon dioxide lean solution absorbs the carbon dioxide formation carbon dioxide rich solution in flue gas；
(4) carbon dioxide rich solution is introduced into heating device and heated, the sodium bicarbonate 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；
(5) carbon dioxide collection for separating step (4) stores.
Wherein, the absorption tower is spray absorption tower.
Wherein, heating device described in step (4) is plate heat exchanger.
Wherein, the heat source of heating device described in step (4) is fume afterheat.
Embodiment 3:
(1) flue gas containing carbon dioxide is purified, including dedusting, desulphurization denitration processing；
(2) temperature of treated flue gas is adjusted 40 DEG C, the temperature adjustment mode of flue gas is that heat exchanger exchanges heat or water washing
Mode；Then gas-liquid two-phase chemical reaction occurs in absorption tower with carbon dioxide lean solution, carbon dioxide lean solution absorbs in flue gas
Carbon dioxide；The concentration of the sodium carbonate liquor is 1.2mol/L；
(3) carbon dioxide lean solution absorbs the carbon dioxide formation carbon dioxide rich solution in flue gas；
(4) carbon dioxide rich solution is introduced into heating device and heated, the sodium bicarbonate 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；
(5) carbon dioxide collection for separating step (4) stores.
Wherein, the absorption tower is spray absorption tower.
Wherein, heating device described in step (4) is plate heat exchanger.
Wherein, the heat source of heating device described in step (4) is fume afterheat.
Embodiment 4:
(1) flue gas containing carbon dioxide is purified, including dedusting, desulphurization denitration processing；
(2) temperature of treated flue gas is adjusted 30 DEG C, the temperature adjustment mode of flue gas is that heat exchanger exchanges heat or water washing
Mode；Then gas-liquid two-phase chemical reaction occurs in absorption tower with carbon dioxide lean solution, carbon dioxide lean solution absorbs in flue gas
Carbon dioxide；The concentration of the sodium carbonate liquor is 1.2mol/L；
(3) carbon dioxide lean solution absorbs the carbon dioxide formation carbon dioxide rich solution in flue gas；
(4) carbon dioxide rich solution is introduced into heating device and heated, the sodium bicarbonate 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；
(5) carbon dioxide collection for separating step (4) stores.
Wherein, the absorption tower is spray absorption tower.
Wherein, heating device described in step (4) is plate heat exchanger.
Wherein, the heat source of heating device described in step (4) is fume afterheat.
Embodiment 5:
(1) flue gas containing carbon dioxide is carried out purification includes dedusting, desulphurization denitration processing；
(2) 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 chemical reaction occurs in absorption tower with carbon dioxide lean solution, carbon dioxide lean solution absorbs in flue gas
Carbon dioxide；The concentration of the sodium carbonate liquor is 1.2mol/L；
(3) carbon dioxide lean solution absorbs the carbon dioxide formation carbon dioxide rich solution in flue gas；
(4) carbon dioxide rich solution is introduced into heating device and heated, the sodium bicarbonate 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；
(5) carbon dioxide collection for separating step (4) stores.
Wherein, the absorption tower is spray absorption tower.
Wherein, heating device described in step (4) is plate heat exchanger.
Wherein, the heat source of heating device described in step (4) is fume afterheat.
Claims (8)
1. a kind of method using carbon dioxide in sodium carbonate liquor trapping flue gas, it is characterised in that: the following steps are included:
(1) flue gas containing carbon dioxide is purified；(2) temperature of purified flue gas is adjusted to not higher than 50 DEG C；(3) it makes
Standby carbon dioxide lean solution, and it is introduced into absorption tower；(4) by after temperature adjustment flue gas introduce absorption tower, then with titanium dioxide
Gas-liquid two-phase contact occurs in absorption tower for carbon lean solution, and carbon dioxide lean solution absorbs the carbon dioxide in flue gas, forms titanium dioxide
Carbon rich solution；(5) carbon dioxide rich solution is introduced into heating device and heated, the sodium bicarbonate decomposition in carbon dioxide rich solution releases
The step of carbon dioxide, at the same time, carbon dioxide rich solution are changed into carbon dioxide lean solution, and subsequent cycle is used as after cooling (3),
Continue absorbing carbon dioxide；(6) carbon dioxide collection for separating step (5) stores.
2. the method according to claim 1 using carbon dioxide in sodium carbonate liquor trapping flue gas, feature exist
In: the gas cleaning of step (1) include one of measures such as flue gas ash removal, flue gas desulfurization and denitrating flue gas or several
In conjunction with.
3. the method according to claim 1 using carbon dioxide in sodium carbonate liquor trapping flue gas, feature exist
In: the temperature of flue gas is not higher than 40 DEG C in step (2).
4. the method according to claim 1 using carbon dioxide in sodium carbonate liquor trapping flue gas, feature exist
In: the concentration of sodium carbonate liquor described in step (3) is no more than 1.2mol/L.
5. the method according to claim 1 using carbon dioxide in sodium carbonate liquor trapping flue gas, feature exist
In: the temperature adjustment mode of flue gas described in step (2) is heat exchanger heat exchange or water washing mode.
6. the method according to claim 1 using carbon dioxide in sodium carbonate liquor trapping flue gas, feature exist
In: the absorption tower is spray absorption tower.
7. the method according to claim 1 using carbon dioxide in sodium carbonate liquor trapping flue gas, feature exist
In: heating device described in step (5) is plate heat exchanger.
8. the method according to claim 1 using carbon dioxide in sodium carbonate liquor trapping flue gas, feature exist
In: the heat source of heating device described in step (5) is fume afterheat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810688936.6A CN108970362A (en) | 2018-06-28 | 2018-06-28 | A method of utilizing carbon dioxide in sodium carbonate liquor trapping flue gas |
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| CN201810688936.6A CN108970362A (en) | 2018-06-28 | 2018-06-28 | A method of utilizing carbon dioxide in sodium carbonate liquor trapping flue gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114984721A (en) * | 2022-05-24 | 2022-09-02 | 光大环境科技（中国）有限公司 | System and method for recovering carbon dioxide in flue gas |
Citations (1)
| 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 |
-
2018
- 2018-06-28 CN CN201810688936.6A patent/CN108970362A/en active Pending
Patent Citations (1)
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114984721A (en) * | 2022-05-24 | 2022-09-02 | 光大环境科技（中国）有限公司 | System and method for recovering carbon dioxide in flue gas |
| CN114984721B (en) * | 2022-05-24 | 2024-01-26 | 光大环境科技（中国）有限公司 | System and method for recycling carbon dioxide in flue gas |
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Application publication date: 20181211 |