CN113926298A - Sodium-based dry flue gas desulfurization process - Google Patents
Sodium-based dry flue gas desulfurization process Download PDFInfo
- Publication number
- CN113926298A CN113926298A CN202111313932.8A CN202111313932A CN113926298A CN 113926298 A CN113926298 A CN 113926298A CN 202111313932 A CN202111313932 A CN 202111313932A CN 113926298 A CN113926298 A CN 113926298A
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- Prior art keywords
- flue gas
- sodium
- powder
- sodium bicarbonate
- meshes
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Links
- 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 27
- 230000023556 desulfurization Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 23
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 title claims abstract description 15
- 239000011734 sodium Substances 0.000 title claims abstract description 15
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 15
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical group [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 54
- 239000000843 powder Substances 0.000 claims abstract description 50
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 38
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 27
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 27
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 19
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 17
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 12
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 11
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 11
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 11
- 239000000428 dust Substances 0.000 claims abstract description 9
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims abstract description 4
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 230000004913 activation Effects 0.000 claims description 6
- 235000010265 sodium sulphite Nutrition 0.000 claims description 6
- 229910001868 water Inorganic materials 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 1
- 239000011148 porous material Substances 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 1
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- 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
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- 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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention relates to the technical field of flue gas desulfurization, in particular to a sodium-based dry flue gas desulfurization process. The main process flow is as follows: spraying ultrafine powder of 800-1000 meshes into flue gas to be desulfurized at the temperature of above 130 ℃, wherein the ultrafine powder is sodium bicarbonate powder particles, the sodium carbonate particles and the flue gas are fully contacted through a Venturi structure in a desulfurizing tower to react to generate sodium sulfate and carbon dioxide, then introducing the flue gas into a bag-type dust remover, and sucking out clean flue gas through a draught fan at the outlet of the dust remover and discharging the clean flue gas from a chimney. The invention utilizes an air classification grinder to grind the sodium bicarbonate coarse powder of 60-120 meshes to the superfine powder of 800-1000 meshes, the superfine powder is sprayed into a desulfurizing tower to be fully mixed with high-temperature flue gas, and the sodium bicarbonate is decomposed at high temperature, so that fine honeycomb-shaped particles are formed, the specific surface area is extremely high, the desulfurizing efficiency is greatly improved, and the effective removal of sulfur dioxide in the flue gas is ensured.
Description
Technical Field
The invention relates to the technical field of flue gas desulfurization, in particular to a sodium-based dry flue gas desulfurization process.
Background
The SDS sodium-based dry flue gas desulfurization technology is a very advanced technology applied to ultralow emission at present in China, and is also a relatively mature mainstream SDS dry flue gas desulfurization technology. The method is mainly characterized by compact equipment arrangement, simple process route and simple operation. The SDS sodium-based dry desulfurization technology adopts sodium bicarbonate solid powder as an absorbent to react with flue gas to generate sodium sulfate. However, the desulfurization efficiency of the existing sodium bicarbonate dry desulfurization method needs to be improved, and the sodium bicarbonate is large in consumption in the desulfurization process, so that waste is easily caused.
Disclosure of Invention
The invention solves the problems that: aiming at the problems that the desulfurization efficiency of sodium hydrogen sulfate dry desulfurization needs to be improved and the desulfurizing agent is wasted, the sodium-based dry flue gas desulfurization process with high desulfurization efficiency is provided.
The invention is realized by the following technical scheme, and the sodium-based dry flue gas desulfurization process mainly comprises the following process flows: spraying ultrafine powder of 800-1000 meshes into flue gas to be desulfurized at the temperature of more than 130 ℃, wherein the ultrafine powder is sodium bicarbonate powder particles, the sodium bicarbonate can be decomposed into sodium carbonate, water and carbon dioxide at high temperature, the resolved water becomes water vapor to be dissipated, air holes are formed on the sodium carbonate particles, finally the sodium carbonate particles can form a honeycomb sphere shape and have ultrahigh specific surface area, in a desulfurizing tower, the sodium carbonate particles and the flue gas are fully contacted through a Venturi structure, sulfur dioxide, sodium carbonate and oxygen react to generate sodium sulfate and carbon dioxide, part of the sodium sulfate is not oxidized to generate sodium sulfite, then introducing the flue gas into a bag-type dust remover, collecting the sodium sulfate, the sodium sulfite and the residual sodium carbonate to enter a recovery system for treatment, and the purified flue gas is sucked out through a draught fan at the outlet of the dust remover and is discharged from a chimney.
Further, the superfine powder is prepared by grinding sodium bicarbonate coarse powder with 60-120 meshes through a grinding machine.
Further, the powder making system of the process comprises a raw material bin, a metering bin, an air classification grinding machine, a cyclone type fine powder collector, a stirring hopper and a fan, wherein the raw material bin is used for storing 60-120 meshes of sodium bicarbonate coarse powder, a gate valve and a star-shaped feeder are arranged below the raw material bin, the lower part of the star-shaped feeder is connected with the metering bin through flexible connection, two charge level meters are arranged on the side surface of the metering bin, a discharge port of the metering bin conveys the coarse powder into the air classification grinding machine through a conveying device, an outlet of the air classification grinding machine is connected with the cyclone type fine powder collector, the cyclone type fine powder collector is driven by the fan to extract air outwards, fine powder is captured by a built-in filter bag and falls into an activation hopper at the bottom, the activation hopper is connected with the stirring hopper through the flexible connection and a manual gate valve, and two spiral conveyors are arranged at the bottom of the stirring hopper, the discharge port of the screw conveyer is connected with a pneumatic conveying pipeline, and the pneumatic conveying pipeline is powered by a fan.
Further, in order to ensure the desulfurization efficiency and save the usage amount of baking soda, the molar ratio of the input amount of sodium bicarbonate in unit time to the total amount of sulfur dioxide in flue gas in unit time is 2: 1.03 to 1.05.
The invention has the beneficial effects that:
the invention utilizes an air classification grinder to grind the sodium bicarbonate coarse powder of 60-120 meshes to the superfine powder of 800-1000 meshes, the superfine powder is sprayed into a desulfurizing tower to be fully mixed with high-temperature flue gas, and the sodium bicarbonate is decomposed at high temperature, so that fine honeycomb-shaped particles are formed, the specific surface area is extremely high, the desulfurizing efficiency is greatly improved, and the effective removal of sulfur dioxide in the flue gas is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a sodium-based dry flue gas desulfurization process according to the present invention.
In the figure: 1, a desulfurizing tower; 2, a bag-type dust collector; 3, a draught fan; 4, a chimney; 5, a raw material bin; 6, a metering bin; 7 air classification grinder; 8, a cyclone type fine powder collector; 9 stirring the hopper; 10 blower.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a sodium-based dry flue gas desulfurization process mainly comprises the following process flows: spraying ultrafine powder of 800-1000 meshes into flue gas to be desulfurized at the temperature of more than 130 ℃, wherein the ultrafine powder is sodium bicarbonate powder particles, the sodium bicarbonate can be decomposed into sodium carbonate, water and carbon dioxide at high temperature, the resolved water becomes water vapor to be dissipated, air holes are formed on the sodium carbonate particles, finally the sodium carbonate particles can form a honeycomb sphere and have ultrahigh specific surface area, in a desulfurizing tower 1, the sodium carbonate particles and the flue gas are fully contacted through a Venturi structure, sulfur dioxide, sodium carbonate and oxygen react to generate sodium sulfate and carbon dioxide, part of the sodium sulfate is not oxidized to generate sodium sulfite, then introducing the flue gas into a bag-type dust remover 2, collecting the sodium sulfate, the sodium sulfite and residual sodium carbonate to enter a recovery system for treatment, sucking out the purified flue gas through a draught fan 3 at the outlet of the dust remover, and discharging the purified flue gas from a chimney 4.
In practical application, the superfine powder is prepared by grinding sodium bicarbonate coarse powder with 60-120 meshes by a grinder.
In practical application, the powder making system of the process comprises a raw material bin 5, a metering bin 6, an air classification grinding machine 7, a cyclone type fine powder collector 8, a stirring hopper 9 and a fan 10, wherein the raw material bin 5 is used for storing 60-120 meshes of sodium bicarbonate coarse powder, a gate valve and a star-shaped feeder are arranged below the raw material bin 5, the lower part of the star-shaped feeder is connected with the metering bin 6 through flexible connection, two level meters are arranged on the side surface of the metering bin 6, a discharge port of the metering bin 6 conveys the coarse powder into the air classification grinding machine 7 through a conveying device, an outlet of the air classification grinding machine 7 is connected with the cyclone type fine powder collector 8, the cyclone type fine powder collector 8 is driven by the fan 10 to suck air outwards, fine powder is captured by a built-in filter bag and falls into an activation hopper at the bottom, and the activation hopper is connected with the stirring hopper 9 through the flexible connection and a manual gate valve, the bottom of the stirring hopper 9 is provided with two spiral conveyors, the discharge ports of the spiral conveyors are connected with a pneumatic conveying pipeline, and the pneumatic conveying pipeline is powered by a fan 10.
In practical application, in order to ensure the desulfurization efficiency and save the usage amount of baking soda, the molar ratio of the input amount of sodium bicarbonate in unit time to the total amount of sulfur dioxide in flue gas in unit time is 2: 1.03 to 1.05.
The working principle of the invention is as follows:
the invention utilizes an air classification grinder to grind the sodium bicarbonate coarse powder of 60-120 meshes to the superfine powder of 800-1000 meshes, the superfine powder is sprayed into a desulfurizing tower to be fully mixed with high-temperature flue gas, and the sodium bicarbonate is decomposed at high temperature, so that fine honeycomb-shaped particles are formed, the specific surface area is extremely high, the desulfurizing efficiency is greatly improved, and the effective removal of sulfur dioxide in the flue gas is ensured.
In conclusion, the sodium-based dry flue gas desulfurization process has the advantage of high desulfurization efficiency.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the foregoing embodiments are merely illustrative of the technical spirit and features of the present invention, and the present invention is not limited thereto but may be implemented by those skilled in the art.
Claims (4)
1. A sodium-based dry flue gas desulfurization process is characterized in that: spraying 800-1000 mesh superfine powder into the flue gas to be desulfurized at the temperature of more than 130 ℃, the superfine powder is sodium bicarbonate powder particles, the sodium bicarbonate can be decomposed into sodium carbonate, water and carbon dioxide at high temperature, the resolved water is changed into water vapor to be emitted, pores are formed on the sodium carbonate particles, and finally the sodium carbonate particles can form a honeycomb spherical shape with ultrahigh specific surface area, in the desulfurizing tower (1), sodium carbonate particles and flue gas are fully contacted through a Venturi structure, sulfur dioxide, sodium carbonate and oxygen react to generate sodium sulfate and carbon dioxide, part of the sodium sulfate is not oxidized to generate sodium sulfite, then the flue gas is introduced into a bag-type dust remover (2), the sodium sulfate, the sodium sulfite and residual sodium carbonate are collected and enter a recovery system for treatment, and clean flue gas is sucked out through a draught fan (3) at the outlet of the dust remover and is discharged from a chimney (4).
2. The sodium-based dry flue gas desulfurization process according to claim 1, characterized in that: the superfine powder is prepared by grinding sodium bicarbonate coarse powder with 60-120 meshes by a grinder.
3. The sodium-based dry flue gas desulfurization process according to claim 2, characterized in that: the powder making system of the process comprises a raw material bin (5), a metering bin (6), an air classifying grinder (7), a cyclone type fine powder collector (8), a stirring hopper (9) and a fan (10), wherein the raw material bin (5) is used for storing 60-120 meshes of sodium bicarbonate coarse powder, a gate valve and a star-shaped feeder are arranged below the raw material bin (5), the lower part of the star-shaped feeder is connected with the metering bin (6) through flexible connection, two material level meters are arranged on the side surface of the metering bin (6), a discharge hole of the metering bin (6) conveys the coarse powder into the air classifying grinder (7) through a conveying device, an outlet of the air classifying grinder (7) is connected with the cyclone type fine powder collector (8), the cyclone type fine powder collector (8) is driven by the fan (10) to pump outwards, fine powder is captured by a built-in filter bag, and falls into an activation hopper at the bottom, the activation hopper is connected with the stirring hopper (9) through a flexible connection and a manual gate valve, two spiral conveyors are arranged at the bottom of the stirring hopper (9), discharge ports of the spiral conveyors are connected with a pneumatic conveying pipeline, and the pneumatic conveying pipeline is powered by a fan (10).
4. The sodium-based dry flue gas desulfurization process according to claim 1, characterized in that: the molar ratio of the input amount of the sodium bicarbonate in unit time to the total amount of the sulfur dioxide in the flue gas in unit time is 2: 1.03 to 1.05.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111313932.8A CN113926298A (en) | 2021-11-08 | 2021-11-08 | Sodium-based dry flue gas desulfurization process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111313932.8A CN113926298A (en) | 2021-11-08 | 2021-11-08 | Sodium-based dry flue gas desulfurization process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113926298A true CN113926298A (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111313932.8A Pending CN113926298A (en) | 2021-11-08 | 2021-11-08 | Sodium-based dry flue gas desulfurization process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113926298A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114940382A (en) * | 2022-06-23 | 2022-08-26 | 山东保蓝环保工程有限公司 | Sodium bicarbonate ultrafine powder blanking and conveying system in flue gas dry desulphurization |
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Application publication date: 20220114 |