CN108043204B - High-calcium pulverized coal flue gas desulfurization system and application thereof - Google Patents
High-calcium pulverized coal flue gas desulfurization system and application thereof Download PDFInfo
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- CN108043204B CN108043204B CN201711383727.2A CN201711383727A CN108043204B CN 108043204 B CN108043204 B CN 108043204B CN 201711383727 A CN201711383727 A CN 201711383727A CN 108043204 B CN108043204 B CN 108043204B
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- flue gas
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- sedimentation
- desulfurization
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 239000003546 flue gas Substances 0.000 title claims abstract description 45
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 40
- 230000023556 desulfurization Effects 0.000 title claims abstract description 40
- 239000011575 calcium Substances 0.000 title claims abstract description 39
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 37
- 239000003245 coal Substances 0.000 title claims abstract description 14
- 238000004062 sedimentation Methods 0.000 claims abstract description 40
- 239000002002 slurry Substances 0.000 claims abstract description 29
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 28
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 28
- 239000010881 fly ash Substances 0.000 claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 239000000428 dust Substances 0.000 claims abstract description 19
- 230000008929 regeneration Effects 0.000 claims abstract description 19
- 238000011069 regeneration method Methods 0.000 claims abstract description 19
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000292 calcium oxide Substances 0.000 claims abstract description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 13
- 235000017550 sodium carbonate Nutrition 0.000 claims description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000000706 filtrate Substances 0.000 claims description 7
- 239000013049 sediment Substances 0.000 claims description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 238000004537 pulping Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 2
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 2
- 239000004571 lime Substances 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 abstract 1
- 230000001172 regenerating effect Effects 0.000 abstract 1
- 239000011734 sodium Substances 0.000 description 6
- 239000004567 concrete Substances 0.000 description 4
- 229910001415 sodium ion Inorganic materials 0.000 description 4
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 239000002956 ash Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
-
- 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
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/602—Oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a high-calcium pulverized coal flue gas desulfurization system and application thereof, wherein the system comprises a boiler, a dust remover connected with a flue gas outlet of the boiler, a desulfurizing tower connected with the flue gas outlet of the dust remover, a reheater connected with the flue gas outlet of the desulfurizing tower, a chimney connected with the flue gas outlet of the reheater, a slurry pond with a fly ash inlet connected with the fly ash outlet of the dust remover, a sedimentation pond connected with the outlet of the slurry pond, and a stirring pond for preparing soda solution, SO that SO is absorbed 2 And a sedimentation tank for carrying out sedimentation separation on slurry in the regeneration tank, and pumping the residual liquid in the sedimentation tank into a circulating pump of the desulfurization tower. The invention uses the calcium oxide in the high-calcium fly ash for regenerating the desulfurization liquid, so that the high-calcium fly ash in the power station is fully utilized, the lime purchasing cost of the power station is saved, and the economic benefit is improved.
Description
Technical Field
The invention belongs to the field of flue gas treatment, and particularly relates to a high-calcium pulverized coal flue gas desulfurization system and application thereof.
Background
The high-calcium fly ash is the fly ash with higher calcium oxide content discharged from a thermal power plant, can be used as a cement mixed material or a concrete admixture, has the advantages of good water reducing effect, quick early strength development and the like, but can cause unqualified cement stability and even expansion cracking of concrete due to high free calcium oxide content, so that the high-calcium fly ash has not been well utilized to date.
Disclosure of Invention
The invention aims to solve the problems and provide a high-calcium pulverized coal flue gas desulfurization system and application thereof.
The aim of the invention is achieved by the following technical scheme:
the utility model provides a high calcium fine coal flue gas desulfurization system, includes the boiler, with boiler flue gas exit linkage's dust remover and with dust remover flue gas exit linkage's desulfurizing tower, the fly ash exit linkage thick liquid pond of dust remover, the sedimentation tank is connected to the thick liquid pond, the regeneration tank is connected to the sedimentation tank, the desulfurizing tower is beaten into to the hydrologic cycle of sedimentation tank, and the desulfurizing tower bottom liquid lets in the regeneration tank.
Further, a flue gas outlet of the desulfurizing tower is connected with a reheater, and a flue gas outlet of the reheater is connected with a chimney.
Further, the liquid in the sedimentation tank is pumped into the desulfurizing tower through a circulating pump.
Further, the desulfurizing tower is connected with the stirring pool.
Further, soda ash is added into the stirring tank and the slurry tank, the PH value of the slurry is increased, the loss of calcium caused by the gel phenomenon is reduced, meanwhile, sodium ions in the regeneration tank are increased, and the subsequent sodium ion supplementing procedure is eliminated.
Further, the sodium carbonate is sodium carbonate.
The desulfurization system is used for treating boiler high-calcium pulverized coal flue gas.
The specific working principle of the invention is that boiler flue gas is collected by a dust remover, sulfur-containing flue gas is sent to a desulfurizing tower for desulfurization, and high-calcium fly ash is sent to a slurry pond for treatment.
When the desulfurizing tower is used for desulfurizing, sodium carbonate is added into the stirring pool to prepare desulfurizing liquid Na 2 CO 3 And NaOH is sent to a desulfurizing tower, the flue gas contacts with desulfurizing liquid in the desulfurizing tower, and the contact reaction is fully carried out in an atomization zone, so that the desulfurization absorption and further dust removal of the flue gas are completed, and the desulfurized flue gas enters a reheater and is discharged from a chimney.
When the high-calcium fly ash is sent to a slurry pond for treatment, the high-calcium fly ash and water are mixed and beaten into slurry according to a certain weight-volume ratio, meanwhile, a proper amount of sodium carbonate is added to improve the solubility of calcium oxide, an outlet of the slurry pond is connected with a sedimentation pond, sediment is dried and transported outwards after sedimentation is finished, desulfurization liquid and high-calcium fly ash filtrate in the sedimentation pond enter a regeneration pond for full reaction, the reacted slurry flows into the sedimentation pond for sedimentation, sediment in the sedimentation pond is dried and transported outwards after sedimentation is finished, the rest liquid is pumped into a desulfurization tower for cyclic utilization, and the lower liquid of the sedimentation pond is Ca (OH) 2 And Na (Na) 2 CO 3 A solution.
The concrete reaction in the slurry pond is as follows:
the specific reaction in the desulfurizing tower is as follows:
the specific reaction in the regeneration tank is as follows:
the invention provides a mode for treating and applying the high-calcium fly ash, and compared with the prior art, the invention has the advantages that:
1. the high-calcium fly ash is fully utilized, so that calcium oxide in the fly ash is recycled, and the calcium oxide in the high-calcium fly ash is removed;
2. the high-calcium fly ash is converted into low-calcium fly ash, so that the usability of the building material market is improved;
3. the lime purchasing cost of the power station is saved, and the economic benefit is improved.
Drawings
FIG. 1 is a schematic view of the structure of the desulfurization system of the present invention;
FIG. 2 is a schematic representation of a settling pond in accordance with the present invention;
in the figure: 1-a boiler; 2-a dust remover; 3-desulfurizing tower; a 4-reheater; 5-chimney; 6-a slurry pool; 7, a stirring pool; 8-a regeneration tank; 9-a sedimentation tank; 10-a circulating pump; 11-settling pond.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments thereof, wherein it is apparent that the embodiments described are by way of illustration only and not of limitation. All other embodiments obtained without making any inventive effort based on the embodiments of the present invention fall within the scope of the present invention.
The invention provides a high-calcium pulverized coal flue gas desulfurization system, which is shown in figure 1 and comprises a boiler 1, a dust remover 2 connected with a flue gas outlet of the boiler 1, a desulfurizing tower 3 connected with the flue gas outlet of the dust remover 2, a reheater 4 connected with the flue gas outlet of the desulfurizing tower 3, a chimney 5 connected with the flue gas outlet of the reheater 4, a slurry tank 6 with a coal ash inlet connected with the coal ash outlet of the dust remover 2, a sedimentation tank 11 connected with the outlet of the slurry tank 6, a stirring tank 7 for configuring soda solution and enabling SO to be absorbed 2 The desulfurization liquid after the reaction fully reacts with the high-calcium fly ash filtrate in the sedimentation tank 11, and the sedimentation tank 9 for carrying out sedimentation separation on the slurry in the sedimentation tank drives the residual liquid in the sedimentation tank 9 into the circulating pump 10 of the desulfurization tower 3. The boiler flue gas reaches a slurry pond 6 after being collected by a dust remover 2, and the high-calcium fly ash and water are mixed and beaten into slurry according to a certain weight-volume ratioAnd meanwhile, a proper amount of sodium carbonate is added to improve the solubility of the calcium oxide, and the sediment is discharged after the high-calcium fly ash slurry is settled in a settling tank 11, wherein the schematic diagram of the settling tank is shown in figure 2.
In the preferred technical scheme, sodium carbonate is sent into a stirring tank 7 to prepare desulfurization solution Na 2 CO 3 And NaOH solution, wherein the flue gas contacts with desulfurization liquid in the desulfurization tower 3, and the flue gas and alkaline desulfurizing agent in the desulfurization liquid fully contact and react in an atomization zone to complete desulfurization absorption and further dust removal of the flue gas, and the desulfurized flue gas enters a reheater 4 and is discharged through a chimney 5.
The lower liquid of the sedimentation tank 11 is Ca (OH) 2 And Na (Na) 2 CO 3 The solution, settling tank 11 and liquid are fed to the regeneration tank 8. Absorb SO 2 The desulfurization liquid flows into a regeneration tank 8 to carry out regeneration reaction with the fed high-calcium fly ash filtrate, the reacted slurry flows into a sedimentation tank 9 to carry out sedimentation, then the sediment precipitated in the sedimentation tank 9 is manually cleaned, the sediment is transported out for treatment after being dried, and the filtrate after regeneration and sedimentation filtration in the circulation tank is pumped into a desulfurization tower 3 for recycling by a circulating pump 10.
The concrete working principle of the high-calcium pulverized coal in the slurry pond is as follows: mixing ash and enough water to prepare slurry, adding proper amount of sodium carbonate to improve dissolution of calcium oxide, increasing pH value of the slurry, reducing calcium loss caused by gel phenomenon, increasing sodium ions in a regeneration tank, and eliminating subsequent sodium ion supplementing procedure. The precipitate was filtered and the filtrate was sent to a regeneration tank. And (3) reacting the desulfurized liquid in the regeneration tank with calcium hydroxide for regeneration, filtering the precipitate in a sedimentation tank, and sending the obtained filtrate into a desulfurizing tower for desulfurization.
The above is merely a basic description of the present invention, and any equivalent transformation according to the technical solution of the present invention shall fall within the protection scope of the present invention.
Claims (4)
1. The application of the high-calcium pulverized coal flue gas desulfurization system is characterized in that the desulfurization system is used for treating boiler high-calcium pulverized coal flue gas, the desulfurization system comprises a boiler (1), a dust remover (2) connected with a flue gas outlet of the boiler (1) and a desulfurization tower (3) connected with the flue gas outlet of the dust remover (2), a slurry pond (6) is connected with a fly ash outlet of the dust remover (2), a sedimentation pond (11) is connected with a regeneration pond (8), the regeneration pond (8) is connected with a sedimentation pond (9), liquid in the sedimentation pond (9) is circularly pumped into the desulfurization tower (3), and liquid at the bottom of the desulfurization tower (3) is introduced into the regeneration pond (8);
soda ash is added into the slurry pool (6);
the application method comprises the following steps:
collecting boiler flue gas through a dust remover (2), delivering sulfur-containing flue gas to a desulfurizing tower (3) for desulfurization, and delivering high-calcium fly ash to a slurry pond (6) for treatment;
when the desulfurizing tower (3) is used for desulfurizing, sodium carbonate is added into the stirring pool (7) to prepare sodium carbonate and sodium hydroxide serving as desulfurizing liquids, the sodium carbonate and the sodium hydroxide are sent to the desulfurizing tower (3), the flue gas contacts the desulfurizing liquids in the desulfurizing tower (3), the full contact reaction is carried out in the atomizing area, the desulfurizing absorption and the further dust removal of the flue gas are completed, and the desulfurized flue gas enters the reheater (4) and is discharged by a chimney;
when the high-calcium fly ash is sent to a slurry pond (6) for treatment, the high-calcium fly ash and water are mixed in the slurry pond (6) for pulping, soda ash is added to improve the solubility of calcium oxide, an outlet of the slurry pond (6) is connected with a sedimentation pond (11), sediment is dried and transported outwards after sedimentation is finished, desulfurization liquid and high-calcium fly ash filtrate in the sedimentation pond (11) enter a regeneration pond (8) for full reaction, the reacted slurry flows into a sedimentation pond (9) for sedimentation, sediment in the sedimentation pond (9) is dried and transported outwards after sedimentation is finished, and the rest liquid is pumped into a desulfurization tower (3) for recycling through a circulating pump (10).
2. Use of a high calcium pulverized coal flue gas desulfurization system according to claim 1, characterized in that the flue gas outlet of the desulfurization tower (3) is connected to a reheater (4), and the flue gas outlet of the reheater (4) is connected to a chimney (5).
3. Use of a high calcium pulverized coal flue gas desulfurization system according to claim 1, characterized in that the liquid of the sedimentation tank (9) is pumped into the desulfurization tower (3) via a circulation pump (10).
4. Use of a high calcium pulverized coal flue gas desulfurization system according to claim 1, characterized in that the desulfurization tower (3) is connected to a stirred tank (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711383727.2A CN108043204B (en) | 2017-12-20 | 2017-12-20 | High-calcium pulverized coal flue gas desulfurization system and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711383727.2A CN108043204B (en) | 2017-12-20 | 2017-12-20 | High-calcium pulverized coal flue gas desulfurization system and application thereof |
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| Publication Number | Publication Date |
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| CN108043204A CN108043204A (en) | 2018-05-18 |
| CN108043204B true CN108043204B (en) | 2024-01-26 |
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| CN201711383727.2A Active CN108043204B (en) | 2017-12-20 | 2017-12-20 | High-calcium pulverized coal flue gas desulfurization system and application thereof |
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| Title |
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| 湿法脱硫系统无垢运行最佳pH值研究;杨奇;;智能城市(02);全文 * |
| 锅炉脱硫除尘系统的改造与实践;胡跃伟;王淑红;王领军;;煤矿机电(03);全文 * |
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