CN114558543B - Absorbent for capturing carbon dioxide in flue gas, preparation method and application method thereof - Google Patents
Absorbent for capturing carbon dioxide in flue gas, preparation method and application method thereof Download PDFInfo
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- CN114558543B CN114558543B CN202111190917.9A CN202111190917A CN114558543B CN 114558543 B CN114558543 B CN 114558543B CN 202111190917 A CN202111190917 A CN 202111190917A CN 114558543 B CN114558543 B CN 114558543B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 230000002745 absorbent Effects 0.000 title claims abstract description 54
- 239000002250 absorbent Substances 0.000 title claims abstract description 54
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 46
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 43
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 239000003546 flue gas Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 128
- 239000011575 calcium Substances 0.000 claims abstract description 128
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 128
- 239000000843 powder Substances 0.000 claims abstract description 79
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims abstract description 54
- 229910000281 calcium bentonite Inorganic materials 0.000 claims abstract description 44
- 238000002156 mixing Methods 0.000 claims abstract description 41
- 238000001354 calcination Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910000027 potassium carbonate Inorganic materials 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 14
- 238000001556 precipitation Methods 0.000 claims abstract description 14
- 238000010521 absorption reaction Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims description 13
- 235000019738 Limestone Nutrition 0.000 claims description 6
- 239000006028 limestone Substances 0.000 claims description 6
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 3
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract 1
- 239000000779 smoke Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 11
- 238000010792 warming Methods 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 241000282414 Homo sapiens Species 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 235000010216 calcium carbonate Nutrition 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003933 environmental pollution control Methods 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/043—Carbonates or bicarbonates, e.g. limestone, dolomite, aragonite
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/12—Naturally occurring clays or bleaching earth
-
- 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
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue 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)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention discloses a preparation method and an application method of an absorbent for capturing carbon dioxide in flue gas, wherein the preparation method of the absorbent comprises the following steps: step 1), fully calcining the calcium-based material to obtain a calcium-based calcined product, and crushing the calcium-based calcined product after cooling to obtain calcium-based calcined powder; step 2), adding the calcium-based calcined powder into water, and uniformly mixing; step 3), adding the calcium bentonite, uniformly mixing, and slowly adding the calcium bentonite while stirring; step 4), adding ethylene bisstearamide and potassium carbonate, uniformly mixing, standing for precipitation, drying and calcining to obtain the efficient absorbent for capturing carbon dioxide in the flue gas. The absorbent is used for absorbing carbon dioxide in smoke in a circulating absorption method in a carbonator, has high absorption capacity, and has small microstructure change and good circulating performance after repeated calcination in the recovery process.
Description
Technical Field
The invention belongs to the field of environmental pollution control, and particularly relates to an absorbent for capturing carbon dioxide in flue gas and an application method thereof.
Background
Climate warming is mainly caused by the warming effect of the chamber gases, such as CO 2. Global warming causes the sea level to rise to flood land, and causes a series of abnormal climates and natural disasters such as movement of climate zones, exacerbation of hurricanes, migration and species extinction of vegetation, epidemic and the like, and the influence of climate warming on human beings and environment is far beyond the imagination of people, so that the living and development of the human beings are more and more threatened.
Global warming is one of the global problems of general concern in today's international society, and has become an important factor affecting future economic and social sustainable development of various countries. Most countries recognize the severity of the problem caused by climate change and promise to take on their own responsibility for coping with the climate change problem.
Coal consumption of coal-fired power plants is the primary source of CO 2 emissions, so solving the CO 2 emissions problem of coal-fired power plants would be key to dealing with climate warming.
The commonly used absorbent of CO 2 is a calcium-based absorbent, but the problem of sharp attenuation of the ability of the calcium-based absorbent to absorb CO 2 after multiple cycles exists.
Disclosure of Invention
The invention aims to provide an absorbent for capturing carbon dioxide in flue gas, which can be used for absorbing carbon dioxide in flue gas, and has high absorption efficiency and good cycle performance.
It is desirable to provide a method of using the above-described absorbent for carbon dioxide capture in flue gas.
The preparation method of the absorbent for capturing carbon dioxide in flue gas comprises the following steps:
step 1), fully calcining the calcium-based material to obtain a calcium-based calcined product, and crushing the calcium-based calcined product after cooling to obtain calcium-based calcined powder;
Step 2), adding the calcium-based calcined powder into water, and uniformly mixing;
Step 3), adding the calcium bentonite, uniformly mixing, and slowly adding the calcium bentonite while stirring;
step 4), adding ethylene bisstearamide and potassium carbonate, uniformly mixing, standing for precipitation, drying and calcining to obtain the absorbent for capturing carbon dioxide in the flue gas.
Wherein the calcium-based material is limestone, preferably the limestone is high calcium limestone, 325 mesh.
Wherein the calcium bentonite montmorillonite is more than 92% and 325 mesh.
Preferably, the calcium bentonite has a viscosity of greater than 80.
Wherein, the weight ratio of the calcium-based calcined powder to the water in the step 2) is (10-15): (80-100), preferably, the weight ratio of the calcium-based calcined powder to water is 10:90.
Wherein the weight ratio (4-5) of the calcium bentonite added in the step 3) to the calcium calcined powder in the step 2): 1, preferably, the weight ratio of the calcium bentonite added in step 3) to the calcium calcined powder in step 2) is 4:1.
Wherein the addition amount of the ethylene bis stearamide in the step 4) is 1-1.5% of the weight of the calcium-based calcined powder, and the addition amount of the potassium carbonate is 2-2.3% of the weight of the calcium-based calcined powder.
Wherein, as a preparation method of the absorbent for capturing carbon dioxide in flue gas,
Step 1), fully calcining the calcium-based material for 1-2 hours at 800 ℃ to obtain a calcium-based calcined product, and after cooling, crushing the calcium-based calcined product to obtain calcium-based calcined powder with the particle size of 300 meshes;
step 2), adding the calcium-based calcined powder into water, wherein the weight ratio of the calcium-based calcined powder to the water is (10-15): (80-100), and uniformly mixing;
Step 3), adding calcium bentonite, and uniformly mixing, wherein the weight ratio of the calcium bentonite to the calcium calcined powder in the step 2) is (4-5): 1, slowly adding calcium bentonite at a stirring speed of 500-600 r/min;
Step 4), adding ethylene bis-stearamide and potassium carbonate, uniformly mixing, wherein the addition amount of the ethylene bis-stearamide is 1-1.5% of the weight of the calcium-based calcined powder, the addition amount of the potassium carbonate is 2-2.3% of the weight of the calcium-based calcined powder, standing for precipitation, and fully calcining for 1-2 hours at 800 ℃ after drying to obtain the absorbent for capturing carbon dioxide in flue gas.
Preferably, the preparation method of the absorbent for capturing carbon dioxide in flue gas,
Step 1), fully calcining the calcium-based material for 2 hours at 800 ℃ to obtain a calcium-based calcined product, and after cooling, crushing the calcium-based calcined product to obtain calcium-based calcined powder with the particle size of 300 meshes;
step 2), adding the calcium-based calcined powder into water, wherein the weight ratio of the calcium-based calcined powder to the water is 10:90, uniformly mixing;
step 3), adding calcium bentonite, and uniformly mixing, wherein the weight ratio of the calcium bentonite to the calcium calcined powder in the step 2) is 4:1, slowly adding calcium bentonite at a stirring speed of 500-600 r/min;
step 4), adding ethylene bis-stearamide and potassium carbonate, uniformly mixing, wherein the addition amount of the ethylene bis-stearamide is 1% of the weight of the calcium-based calcined powder, the addition amount of the potassium carbonate is 2% of the weight of the calcium-based calcined powder, standing for precipitation, and fully calcining for 2 hours at 800 ℃ after drying to obtain the absorbent for capturing carbon dioxide in flue gas.
A method of using an absorbent for capturing carbon dioxide in flue gas as described above for absorbing carbon dioxide in flue gas in a cyclical absorption process in a carbonation furnace.
The absorbent for capturing carbon dioxide in the flue gas, which is prepared by the preparation method, is modified by adding calcium bentonite, and simultaneously ethylene bisstearamide and potassium carbonate are added, and the particle size and microstructure of the absorbent are more suitable for capturing carbon dioxide in the flue gas and have high absorption capacity under a specific process. In the recycling process, the microstructure of the catalyst is less changed by repeated calcination, and the catalyst has good recycling performance.
Drawings
FIG. 1 is a schematic diagram of the process of capturing CO 2 by the absorber cycle.
Detailed Description
In order that those skilled in the art will better understand the present invention, the present invention will be described in further detail with reference to specific embodiments.
Description of raw materials
Limestone: high calcium limestone, 325 mesh, lingshou county Huixin mining processing plant;
calcium bentonite: montmorillonite is more than 92%,325 mesh, lingshou county Jiayuan mineral processing plant;
Ethylene bis stearamide: commercially available
Potassium carbonate: are commercially available.
Examples
Preparation of an absorbent for capturing carbon dioxide in flue gas:
Step 1), fully calcining the calcium-based material for 2 hours at 800 ℃ to obtain a calcium-based calcined product, and after cooling, crushing the calcium-based calcined product to obtain calcium-based calcined powder with the particle size of 300 meshes;
step 2), adding the calcium-based calcined powder into water, wherein the weight ratio of the calcium-based calcined powder to the water is 10:90, uniformly mixing;
Step 3), adding calcium bentonite, and uniformly mixing, wherein the weight ratio of the calcium bentonite to the calcium calcined powder in the step 2) is 4:1, slowly adding calcium bentonite at a stirring speed of 500 r/min;
step 4), adding ethylene bis-stearamide and potassium carbonate, uniformly mixing, wherein the addition amount of the ethylene bis-stearamide is 1% of the weight of the calcium-based calcined powder, the addition amount of the potassium carbonate is 2% of the weight of the calcium-based calcined powder, standing for precipitation, and fully calcining for 2 hours at 800 ℃ after drying to obtain the absorbent for capturing carbon dioxide in flue gas.
Examples
Preparation of an absorbent for capturing carbon dioxide in flue gas:
Step 1), fully calcining the calcium-based material for 2 hours at 800 ℃ to obtain a calcium-based calcined product, and after cooling, crushing the calcium-based calcined product to obtain calcium-based calcined powder with the particle size of 300 meshes;
step 2), adding the calcium-based calcined powder into water, wherein the weight ratio of the calcium-based calcined powder to the water is 10:100, uniformly mixing;
step 3), adding calcium bentonite, and uniformly mixing, wherein the weight ratio of the calcium bentonite to the calcium calcined powder in the step 2) is 5:1, slowly adding calcium bentonite at a stirring speed of 600 r/min;
Step 4), adding ethylene bis-stearamide and potassium carbonate, uniformly mixing, wherein the addition amount of the ethylene bis-stearamide is 1.5% of the weight of the calcium-based calcined powder, the addition amount of the potassium carbonate is 2% of the weight of the calcium-based calcined powder, standing for precipitation, and fully calcining for 2 hours at 800 ℃ after drying to obtain the absorbent for capturing carbon dioxide in the flue gas.
Examples
Preparation of an absorbent for capturing carbon dioxide in flue gas:
Step 1), fully calcining the calcium-based material for 2 hours at 800 ℃ to obtain a calcium-based calcined product, and after cooling, crushing the calcium-based calcined product to obtain calcium-based calcined powder with the particle size of 300 meshes;
step 2), adding the calcium-based calcined powder into water, wherein the weight ratio of the calcium-based calcined powder to the water is 15:85, uniformly mixing;
Step 3), adding calcium bentonite, and uniformly mixing, wherein the weight ratio of the calcium bentonite to the calcium calcined powder in the step 2) is 4:1, slowly adding calcium bentonite at a stirring speed of 500 r/min;
Step 4), adding ethylene bis-stearamide and potassium carbonate, uniformly mixing, wherein the addition amount of the ethylene bis-stearamide is 1% of the weight of the calcium-based calcined powder, the addition amount of the potassium carbonate is 2.3% of the weight of the calcium-based calcined powder, standing for precipitation, and fully calcining for 2 hours at 800 ℃ after drying to obtain the absorbent for capturing carbon dioxide in the flue gas.
Comparative example 1
Preparation of an absorbent for capturing carbon dioxide in flue gas:
Step 1), fully calcining the calcium-based material for 2 hours at 800 ℃ to obtain a calcium-based calcined product, and after cooling, crushing the calcium-based calcined product to obtain calcium-based calcined powder with the particle size of 300 meshes;
step 2), adding the calcium-based calcined powder into water, wherein the weight ratio of the calcium-based calcined powder to the water is 10:90, uniformly mixing;
Step 3), adding ethylene bis-stearamide and potassium carbonate, uniformly mixing, wherein the addition amount of the ethylene bis-stearamide is 1% of the weight of the calcium-based calcined powder, the addition amount of the potassium carbonate is 2% of the weight of the calcium-based calcined powder, standing for precipitation, and fully calcining for 2 hours at 800 ℃ after drying to obtain the absorbent for capturing carbon dioxide in flue gas.
Comparative example 2
Preparation of an absorbent for capturing carbon dioxide in flue gas:
Step 1), fully calcining the calcium-based material for 2 hours at 800 ℃ to obtain a calcium-based calcined product, and after cooling, crushing the calcium-based calcined product to obtain calcium-based calcined powder with the particle size of 300 meshes;
step 2), adding the calcium-based calcined powder into water, wherein the weight ratio of the calcium-based calcined powder to the water is 10:90, uniformly mixing;
step 3), adding calcium bentonite, and uniformly mixing, wherein the weight ratio of the calcium bentonite to the calcium calcined powder in the step 2) is 4.5:1.5, slowly adding the calcium bentonite at a stirring speed of 500 r/min;
And 4) adding potassium carbonate, uniformly mixing, wherein the addition amount of the potassium carbonate is 2% of the weight of the calcium-based calcined powder, standing for precipitation, and fully calcining for 2 hours at 800 ℃ after drying to obtain the absorbent for capturing carbon dioxide in the flue gas.
Comparative example 3
Preparation of an absorbent for capturing carbon dioxide in flue gas:
Step 1), fully calcining the calcium-based material for 2 hours at 800 ℃ to obtain a calcium-based calcined product, and after cooling, crushing the calcium-based calcined product to obtain calcium-based calcined powder with the particle size of 300 meshes;
step 2), adding the calcium-based calcined powder into water, wherein the weight ratio of the calcium-based calcined powder to the water is 10:90, uniformly mixing;
step 3), adding calcium bentonite, and uniformly mixing, wherein the weight ratio of the calcium bentonite to the calcium calcined powder in the step 2) is 4.5:1.5, slowly adding the calcium bentonite at a stirring speed of 500 r/min;
step 4), adding ethylene bis (stearamide) and uniformly mixing, wherein the addition amount of the ethylene bis (stearamide) is 1% of the weight of the calcium-based calcined powder, standing for precipitation, and fully calcining for 2 hours at 800 ℃ after drying to obtain the absorbent for capturing carbon dioxide in the flue gas.
Comparative example 4
Preparation of an absorbent for capturing carbon dioxide in flue gas:
Step 1), fully calcining the calcium-based material for 2 hours at 800 ℃ to obtain a calcium-based calcined product, and after cooling, crushing the calcium-based calcined product to obtain calcium-based calcined powder with the particle size of 300 meshes;
step 2), adding the calcium-based calcined powder into water, wherein the weight ratio of the calcium-based calcined powder to the water is 10:90, uniformly mixing;
Step 3), adding calcium bentonite, and uniformly mixing, wherein the weight ratio of the calcium bentonite to the calcium calcined powder in the step 2) is 4:0.5, slowly adding the calcium bentonite at a stirring speed of 500 r/min;
step 4), adding ethylene bis-stearamide and potassium carbonate, uniformly mixing, wherein the addition amount of the ethylene bis-stearamide is 1% of the weight of the calcium-based calcined powder, the addition amount of the potassium carbonate is 2% of the weight of the calcium-based calcined powder, standing for precipitation, and fully calcining for 2 hours at 800 ℃ after drying to obtain the absorbent for capturing carbon dioxide in flue gas.
Comparative example 5
Preparation of an absorbent for capturing carbon dioxide in flue gas:
Step 1), fully calcining the calcium-based material for 2 hours at 800 ℃ to obtain a calcium-based calcined product, and after cooling, crushing the calcium-based calcined product to obtain calcium-based calcined powder with the particle size of 300 meshes;
step 2), adding the calcium-based calcined powder into water, wherein the weight ratio of the calcium-based calcined powder to the water is 10:90, uniformly mixing;
Step 3), adding calcium bentonite, and uniformly mixing, wherein the weight ratio of the calcium bentonite to the calcium calcined powder in the step 2) is 2:1, slowly adding calcium bentonite at a stirring speed of 500 r/min;
step 4), adding ethylene bis-stearamide and potassium carbonate, uniformly mixing, wherein the addition amount of the ethylene bis-stearamide is 1% of the weight of the calcium-based calcined powder, the addition amount of the potassium carbonate is 2% of the weight of the calcium-based calcined powder, standing for precipitation, and fully calcining for 2 hours at 800 ℃ after drying to obtain the absorbent for capturing carbon dioxide in flue gas.
Performance testing
The absorption capacity of the calcium-based absorbent was measured according to the measurement method disclosed in CN101813500a and is shown in table 1, the used absorbent was then calcined again to recover CO2, and the measurement of the absorption capacity was repeated 8 times for the recycled absorbent, and the attenuation ratio of the absorption capacity was calculated after the 1 st, 4 th and 8 th cycles.
Decay rate=1- (absorption capacity after the nth cycle/initial absorption capacity).
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | |
| Absorption capacity | 65.8 | 63.4 | 64.9 | 52.0 | 49.6 | 45.2 | 55.4 | 62.7 |
| Cycle 1 decay Rate/% | 15 | 16 | 16 | 33 | 35 | 42 | 28 | 34% |
| Cycle 4 decay Rate/% | 26 | 25 | 28 | 51 | 49 | 53 | 56 | 61 |
| Cycle 8 decay Rate/% | 38 | 43 | 45 | 67 | 62 | 70 | 75 | 80 |
As can be seen from Table 2, the absorbent prepared in the examples of the present invention has a good absorption capacity and good cycle performance, which is significantly superior to the absorbent prepared in the comparative example.
Application of absorbent
The absorbent was used in a calcination/carbonation cycle process, the flow of which is shown in figure 1. The absorbent is sent into a pressurized circulating fluid bed carbonator to absorb low concentration of CO2 to generate CaCO3, and CaCO3 generated by carbonation reaction is sent back to a calciner to be calcined again, and fresh absorbent and deactivated absorbent are supplemented at the same time so as to ensure the stability of circulation. The regenerated CaO is sent to the carbonator again to circularly absorb CO 2. The recovered CO2 is dehydrated and liquefied and then is stored or industrially applied.
The above-described examples are merely preferred embodiments of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications can be made without departing from the principles of the present invention, and these modifications should also be considered as being within the scope of the invention.
Claims (5)
1. The preparation method of the absorbent for capturing carbon dioxide in the flue gas is characterized by comprising the following steps of:
step 1), fully calcining the calcium-based material for 1-2 hours at 800 ℃ to obtain a calcium-based calcined product, and after cooling, crushing the calcium-based calcined product to obtain calcium-based calcined powder with the particle size of 300 meshes;
step 2), adding the calcium-based calcined powder into water, wherein the weight ratio of the calcium-based calcined powder to the water is (10-15): (80-100), and uniformly mixing;
Step 3), adding calcium bentonite, and uniformly mixing, wherein the weight ratio of the calcium bentonite to the calcium calcined powder in the step 2) is (4-5): 1, slowly adding calcium bentonite at a stirring speed of 500-600 r/min;
Step 4), adding ethylene bis-stearamide and potassium carbonate, uniformly mixing, wherein the addition amount of the ethylene bis-stearamide is 1-1.5% of the weight of the calcium-based calcined powder, the addition amount of the potassium carbonate is 2-2.3% of the weight of the calcium-based calcined powder, standing for precipitation, and fully calcining for 1-2 hours at 800 ℃ after drying to obtain the absorbent for capturing carbon dioxide in flue gas.
2. The method for preparing the absorbent for capturing carbon dioxide in flue gas according to claim 1, wherein:
the calcium-based material is limestone.
3. The method for preparing the absorbent for capturing carbon dioxide in flue gas according to claim 2, wherein:
the content of the calcium bentonite montmorillonite is more than 92% and 325 mesh.
4. The method for preparing the absorbent for capturing carbon dioxide in flue gas according to claim 1, wherein:
Step 1), fully calcining the calcium-based material for 2 hours at 800 ℃ to obtain a calcium-based calcined product, and after cooling, crushing the calcium-based calcined product to obtain calcium-based calcined powder with the particle size of 300 meshes;
step 2), adding the calcium-based calcined powder into water, wherein the weight ratio of the calcium-based calcined powder to the water is 10:90, uniformly mixing;
step 3), adding calcium bentonite, and uniformly mixing, wherein the weight ratio of the calcium bentonite to the calcium calcined powder in the step 2) is 4:1, slowly adding calcium bentonite at a stirring speed of 500-600 r/min;
step 4), adding ethylene bis-stearamide and potassium carbonate, uniformly mixing, wherein the addition amount of the ethylene bis-stearamide is 1% of the weight of the calcium-based calcined powder, the addition amount of the potassium carbonate is 2% of the weight of the calcium-based calcined powder, standing for precipitation, and fully calcining for 2 hours at 800 ℃ after drying to obtain the absorbent for capturing carbon dioxide in flue gas.
5. A method of using the absorbent for capturing carbon dioxide in flue gas prepared by the preparation method according to any one of claims 1 to 4, for absorbing carbon dioxide in flue gas in a cyclic absorption method in a carbonator.
Priority Applications (1)
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| CN101269316A (en) * | 2008-05-06 | 2008-09-24 | 东南大学 | High-activity kalium group solid absorbing agent for removing CO2 in flue gas and preparation method thereof |
| CN101844038A (en) * | 2010-06-13 | 2010-09-29 | 东南大学 | Method for preparing modified calcium-base absorbent for removing carbon dioxide in flue gas |
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| FR2933009B1 (en) * | 2008-06-30 | 2011-01-21 | Claude Charzat | METHOD OF CAPTURING ATMOSPHERIC CARBON DIOXIDE FOR SEQUESTRATION OR USE |
| CN101961636A (en) * | 2010-09-13 | 2011-02-02 | 东南大学 | Method for modifying carbon dioxide solid absorbent |
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| CN101844038A (en) * | 2010-06-13 | 2010-09-29 | 东南大学 | Method for preparing modified calcium-base absorbent for removing carbon dioxide in flue gas |
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