CN116003004B - Cement production process coupled with carbon dioxide capturing, electrocatalytic and oxygen-enriched combustion - Google Patents
Cement production process coupled with carbon dioxide capturing, electrocatalytic and oxygen-enriched combustion Download PDFInfo
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- CN116003004B CN116003004B CN202310037772.1A CN202310037772A CN116003004B CN 116003004 B CN116003004 B CN 116003004B CN 202310037772 A CN202310037772 A CN 202310037772A CN 116003004 B CN116003004 B CN 116003004B
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- flue gas
- carbon dioxide
- waste heat
- electrolytic cell
- desulfurization
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000004568 cement Substances 0.000 title claims abstract description 43
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 38
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 239000001301 oxygen Substances 0.000 title claims abstract description 23
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 23
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000003546 flue gas Substances 0.000 claims abstract description 42
- 239000002918 waste heat Substances 0.000 claims abstract description 32
- 239000003792 electrolyte Substances 0.000 claims abstract description 19
- 238000010521 absorption reaction Methods 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 230000008878 coupling Effects 0.000 claims abstract description 5
- 238000010168 coupling process Methods 0.000 claims abstract description 5
- 238000005859 coupling reaction Methods 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims abstract description 5
- 238000004064 recycling Methods 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims description 47
- 239000007788 liquid Substances 0.000 claims description 44
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 238000006477 desulfuration reaction Methods 0.000 claims description 25
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 24
- 230000023556 desulfurization Effects 0.000 claims description 22
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 16
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 16
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 16
- 239000000428 dust Substances 0.000 claims description 14
- 239000011736 potassium bicarbonate Substances 0.000 claims description 10
- 229910000028 potassium bicarbonate Inorganic materials 0.000 claims description 10
- 235000015497 potassium bicarbonate Nutrition 0.000 claims description 10
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 claims description 10
- 239000000779 smoke Substances 0.000 claims description 10
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 8
- 235000011181 potassium carbonates Nutrition 0.000 claims description 8
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 8
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 8
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000003786 synthesis reaction Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 235000017550 sodium carbonate Nutrition 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 2
- 229910052815 sulfur oxide Inorganic materials 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000010795 Steam Flooding Methods 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses a cement production process coupling carbon dioxide capture, electrocatalysis and oxygen-enriched combustion, which relates to the technical field of cement flue gas treatment and comprises a cement kiln, a waste heat generator set, a multifunctional absorption tower, an enrichment tower, an electrolytic cell and an electrolyte circulation system, wherein the cement kiln is used for carrying out oxygen-enriched combustion and generating flue gas, the waste heat generator set is used for absorbing flue gas heat energy to generate electricity, the multifunctional absorption tower is used for absorbing non-carbon dioxide matters in the flue gas, the enrichment tower is used for absorbing carbon dioxide, the electrolytic cell is used for carrying out electrolytic reaction, and the electrolyte circulation system is used for recycling electrolyte between the electrolytic cell and the enrichment tower.
Description
Technical Field
The invention relates to a cement flue gas treatment process, in particular to a cement production process coupled with carbon dioxide trapping, electrocatalytic and oxygen-enriched combustion.
Background
Global warming has led to an increasing climate risk, carbon dioxide is the most dominant greenhouse gas emitted at present, the cement industry is the second large carbon emission industry in the industrial field, and carbon dioxide emissions in cement production mainly originate from limestone calcination and fuel burning;
Carbon capture, utilization and sequestration technology (CCUS) is considered as an important means for achieving the aim of double carbon in China, but the existing CCUS technology still has the problems of high carbon dioxide capture energy consumption, single carbon dioxide utilization mode, incapability of being organically combined with the cement industry and the like. For example, patent publication No. CN113606946A discloses a system for capturing carbon dioxide in flue gas of a cement kiln, but the problem of utilizing high-purity carbon dioxide after capturing is not solved. Patent publication No. CN113897630A discloses a device for recycling preparation gas for preparing formic acid by electrolyzing carbon dioxide, but on one hand, the device uses high-purity carbon dioxide gas, so that high carbon dioxide trapping cost cannot be avoided; on the other hand, the main product produced by the device is chemical product formic acid, and the coupling with the cement clinker production process can not be realized;
therefore, the existing device needs to be improved, carbon circulation in the cement production process is realized, and the energy consumption in the carbon capturing process is reduced.
Disclosure of Invention
The invention aims to provide a cement production process coupling carbon dioxide capturing, electrocatalytic and oxygen-enriched combustion, so as to solve the defects caused by the prior art.
The cement production process comprises a cement kiln, a waste heat generator set, a multifunctional absorption tower, an enrichment tower, an electrolytic cell and an electrolyte circulation system, wherein the cement kiln is used for carrying out oxygen-enriched combustion and generating smoke, the waste heat generator set is used for absorbing smoke heat energy to generate electricity, the multifunctional absorption tower is used for absorbing non-carbon dioxide substances in the smoke, the enrichment tower is used for absorbing carbon dioxide, the electrolytic cell is used for carrying out electrolytic reaction, and the electrolyte circulation system is used for recycling electrolyte between the electrolytic cell and the enrichment tower.
Preferably, the waste heat generator set comprises a waste heat boiler and a steam turbine generator set, the waste heat boiler is connected with the cement kiln to absorb heat in the smoke of the cement kiln, the waste heat boiler is a vertical boiler, steam yield can be improved, and the steam turbine generator set is connected with the waste heat boiler and works under the driving of steam generated by the waste heat boiler to convert heat energy into electric energy.
Preferably, the multifunctional absorption tower comprises a dust removing area, a desulfurization and denitrification area, a secondary washing area, a flue gas washing liquid inlet, a flue gas washing liquid outlet, a desulfurization and denitrification liquid inlet, a desulfurization and denitrification liquid outlet, a secondary washing liquid inlet and a secondary washing liquid outlet, wherein the dust removing area, the desulfurization and denitrification area and the secondary washing area are sequentially connected, a separation layer is arranged between the three areas, the flue gas washing liquid inlet and the flue gas washing liquid outlet are respectively arranged at two sides of the dust removing area and are used for removing dust particles in flue gas, the desulfurization and denitrification washing liquid inlet and the desulfurization and denitrification washing liquid outlet are respectively arranged at two sides of the desulfurization and denitrification area and are used for removing sulfur oxides and nitrogen oxides in flue gas, and the secondary washing liquid inlet and the secondary washing liquid outlet are respectively arranged at two sides of the secondary washing area and are used for carrying out secondary washing on the flue gas.
Preferably, one or a mixed solution of potassium hydroxide and sodium hydroxide is arranged in the enrichment tower and is used for absorbing carbon dioxide in the treated flue gas, and the carbon dioxide is enriched and then is converted into potassium bicarbonate (or sodium bicarbonate) and a small amount of potassium carbonate (or sodium carbonate).
Preferably, the electrolytic cell comprises an anode electrode and a cathode electrode, wherein the anode electrode and the cathode electrode are connected with the cement kiln, the anode electrode generates oxygen for oxygen-enriched combustion, and the cathode electrode generates synthesis gas containing carbon monoxide and hydrogen for being used as fuel of the cement kiln.
Preferably, the electrolyte circulation system comprises a circulation pipeline connected with the enrichment tower, the anode electrode and the cathode electrode, wherein the enrichment solution absorbs carbon dioxide to generate potassium bicarbonate (or sodium bicarbonate) and a small amount of potassium carbonate (or sodium carbonate), then the potassium bicarbonate or sodium hydroxide is generated after the reaction of the enrichment solution in the electrolytic cell, and then the enrichment solution is introduced into the electrolytic cell again after the carbon dioxide absorption to become electrolyte.
The invention has the advantages that: the device is used for treating cement flue gas to generate oxygen and synthetic gas fuel for oxygen-enriched combustion in cement production, is environment-friendly, efficient and energy-saving, utilizes the waste heat of the flue gas to supply energy, and fully utilizes the products produced in two stages of the electrolytic cell.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The device comprises a 1-cement kiln, a 2-waste heat generator set, a 3-multifunctional absorption tower, a 4-enrichment tower, a 5-electrolytic cell, a 6-electrolyte circulation system, a 21-waste heat boiler, a 22-turbo generator set, a 31-dust removal area, a 32-desulfurization and denitrification area, a 33-secondary washing area, a 311-flue gas washing liquid inlet, a 312-flue gas washing liquid outlet, a 321-desulfurization and denitrification liquid inlet, a 322-desulfurization and denitrification liquid outlet, a 331-secondary washing liquid inlet, a 332-secondary washing liquid outlet, a 51-anode electrode and a 52-cathode electrode.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
As shown in fig. 1, the cement production process for coupling carbon dioxide capture, electrocatalytic and oxygen-enriched combustion comprises a cement kiln 1, a waste heat generator set 2, a multifunctional absorption tower 3, an enrichment tower 4, an electrolytic cell 5 and an electrolyte circulation system 6, wherein the cement kiln 1 is used for carrying out oxygen-enriched combustion and generating smoke, the waste heat generator set 2 is used for absorbing smoke heat energy to generate electricity, the multifunctional absorption tower 3 is used for absorbing non-carbon dioxide matters in the smoke, the enrichment tower 4 is used for absorbing carbon dioxide, the electrolytic cell 5 is used for carrying out electrolytic reaction, and the electrolyte circulation system 6 is used for recycling electrolyte between the electrolytic cell 5 and the enrichment tower 4.
In this embodiment, the waste heat generator set 2 includes a waste heat boiler 21 and a turbo generator set 22, the waste heat boiler 21 is connected with the cement kiln 1 to absorb heat in the flue gas of the cement kiln 1, the waste heat boiler 21 is a vertical boiler, so that steam yield can be improved, and the turbo generator set 22 is connected with the waste heat boiler 21 and works under the driving of the steam generated by the waste heat boiler 21 to convert heat energy into electric energy.
In this embodiment, the multifunctional absorber 3 includes a dust removing area 31, a desulfurization and denitrification area 32, a secondary washing area 33, a flue gas washing liquid inlet 311, a flue gas washing liquid outlet 312, a desulfurization and denitrification liquid inlet 321, a desulfurization and denitrification liquid outlet 322, a secondary washing liquid inlet 331 and a secondary washing liquid outlet 332, the dust removing area 31, the desulfurization and denitrification area 32 and the secondary washing area 33 are sequentially connected, a separation layer is disposed between the three areas, the flue gas washing liquid inlet 311 and the flue gas washing liquid outlet 312 are respectively disposed at two sides of the dust removing area 31 for removing dust particles in flue gas, the desulfurization and denitrification washing liquid inlet and the desulfurization and denitrification washing liquid outlet are respectively disposed at two sides of the desulfurization and denitrification area 32 for removing sulfur oxides and nitrogen oxides in flue gas, and the secondary washing liquid inlet 331 and the secondary washing liquid outlet 332 are respectively disposed at two sides of the secondary washing area 33 for performing secondary washing on flue gas.
In this embodiment, the electrolyte circulation system 6 includes a circulation pipe connected to the enrichment column 4, the anode electrode 51 and the cathode electrode 52, where the enrichment liquid absorbs carbon dioxide to generate potassium bicarbonate (or sodium bicarbonate) and a small amount of potassium carbonate (or sodium carbonate), and then reacts in the electrolytic cell 5 to generate potassium hydroxide or sodium hydroxide, and then enriches and absorbs carbon dioxide to enter the electrolytic cell 5 again to become electrolyte; one or a mixed solution of potassium hydroxide and sodium hydroxide is arranged in the enrichment tower 4 and is used for absorbing carbon dioxide in the treated flue gas, and the carbon dioxide is enriched and then is converted into potassium bicarbonate (or sodium bicarbonate) and a small amount of potassium carbonate (or sodium carbonate);
The electrolytic cell 5 comprises an anode electrode 51 and a cathode electrode 52, wherein the anode electrode 51 and the cathode electrode 52 are connected with the cement kiln 1, the anode electrode 51 generates oxygen for oxygen-enriched combustion, and the cathode electrode 52 generates synthesis gas containing carbon monoxide and hydrogen for being used as fuel of the cement kiln 1.
The working principle of the invention is as follows: the cement kiln 1 generates flue gas in the production process, the flue gas firstly enters a waste heat boiler 21 to be absorbed with heat energy to generate steam, the steam drives a steam turbine generator unit 22 to generate electricity, the steam turbine generator unit 22 provides heat energy to an electrolytic cell 5 to perform electrolytic reaction, the flue gas enters a multifunctional absorption tower 3 after passing through the waste heat boiler 21, corresponding washing liquid is poured into the multifunctional absorption tower 3 in a zoned mode to perform dust removal treatment, desulfurization and denitrification and secondary washing treatment, the purity of carbon dioxide in the flue gas is improved, then the flue gas enters an enrichment tower 4, the carbon dioxide is absorbed by potassium hydroxide or sodium hydroxide in the enrichment tower 4 to generate potassium bicarbonate (or sodium bicarbonate) and a small amount of potassium carbonate (or sodium carbonate), so that the potassium hydroxide or sodium hydroxide is generated after the reaction is finished, the potassium bicarbonate (or sodium bicarbonate) and a small amount of potassium carbonate are continuously fed into the enrichment tower 4 to participate in the reaction, the electrolytic reduction reaction is performed by the multifunctional absorption tower 3, the electrolytic cell 5 generates oxygen by an anode electrode 51 for combustion, and an oxygen-enriched synthetic fuel containing carbon monoxide and hydrogen is generated by a cathode 52 for combustion.
Based on the above, the device is used for treating cement flue gas to generate oxygen and synthetic gas fuel for oxygen-enriched combustion in cement production, is environment-friendly, efficient and energy-saving, utilizes the waste heat of the flue gas to supply energy, and fully utilizes the products produced by two stages of electrolytic cells.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Claims (2)
1. The cement production process is characterized by comprising a cement kiln (1), a waste heat generator set (2), a multifunctional absorption tower (3), an enrichment tower (4), an electrolytic cell (5) and an electrolyte circulation system (6), wherein the cement kiln (1) is used for carrying out oxygen-enriched combustion and generating smoke, the waste heat generator set (2) is used for absorbing smoke heat energy to generate electricity, the multifunctional absorption tower (3) is used for absorbing non-carbon dioxide matters in the smoke, the enrichment tower (4) is used for absorbing carbon dioxide, the electrolytic cell (5) is used for carrying out electrolytic reaction, and the electrolyte circulation system (6) is used for recycling electrolyte between the electrolytic cell (5) and the enrichment tower (4);
The multifunctional absorption tower (3) comprises a dust removing area (31), a desulfurization and denitrification area (32), a secondary washing area (33), a flue gas washing liquid inlet (311), a flue gas washing liquid outlet (312), a desulfurization and denitrification liquid inlet (321), a desulfurization and denitrification liquid outlet (322), a secondary washing liquid inlet (331) and a secondary washing liquid outlet (332), wherein the dust removing area (31), the desulfurization and denitrification area (32) and the secondary washing area (33) are sequentially connected, a separation layer is arranged between the three areas, the flue gas washing liquid inlet (311) and the flue gas washing liquid outlet (312) are respectively arranged at two sides of the dust removing area (31) and are used for removing dust particles in flue gas, the desulfurization and denitrification washing liquid inlet and the desulfurization and denitrification washing liquid outlet are respectively arranged at two sides of the desulfurization and denitrification area (32) and are respectively arranged at two sides of the secondary washing area (33) and are used for carrying out secondary washing on flue gas;
an enrichment liquid is arranged in the enrichment tower (4), is one or a mixture of potassium hydroxide and sodium hydroxide and is used for absorbing carbon dioxide in the treated flue gas, and the carbon dioxide is converted into potassium bicarbonate or sodium bicarbonate and a small amount of potassium carbonate or sodium carbonate after being enriched;
The electrolytic cell (5) comprises an anode electrode (51) and a cathode electrode (52), wherein the anode electrode (51) and the cathode electrode (52) are connected with the cement kiln (1), the anode electrode (51) generates oxygen for oxygen-enriched combustion, and the cathode electrode (52) generates synthesis gas containing carbon monoxide and hydrogen for being used as fuel of the cement kiln (1);
The electrolyte circulation system (6) comprises a circulation pipeline connected with the enrichment tower (4), the anode electrode (51) and the cathode electrode (52), wherein the enrichment liquid absorbs carbon dioxide to generate potassium bicarbonate and potassium carbonate or sodium bicarbonate and sodium carbonate, then the potassium bicarbonate and the sodium carbonate react in the electrolytic cell (5) to generate potassium hydroxide or sodium hydroxide, and then the potassium hydroxide or sodium hydroxide enters the electrolytic cell (5) again after enriching and absorbing the carbon dioxide to become electrolyte.
2. The cement production process coupling carbon dioxide capture, electrocatalysis and oxygen-enriched combustion according to claim 1, wherein the waste heat generator set (2) comprises a waste heat boiler (21) and a steam turbine generator set (22), the waste heat boiler (21) is connected with the cement kiln (1) to absorb heat in flue gas of the cement kiln (1), the waste heat boiler (21) is a vertical boiler, so that steam yield can be improved, and the steam turbine generator set (22) is connected with the waste heat boiler (21) and works under the driving of steam generated by the waste heat boiler (21) to convert heat energy into electric energy.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310037772.1A CN116003004B (en) | 2023-01-10 | 2023-01-10 | Cement production process coupled with carbon dioxide capturing, electrocatalytic and oxygen-enriched combustion |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310037772.1A CN116003004B (en) | 2023-01-10 | 2023-01-10 | Cement production process coupled with carbon dioxide capturing, electrocatalytic and oxygen-enriched combustion |
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| CN116003004A CN116003004A (en) | 2023-04-25 |
| CN116003004B true CN116003004B (en) | 2024-05-28 |
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| CN116003004A (en) | 2023-04-25 |
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