CN213556297U - Device for removing SO3 in flue gas of coal-fired power plant by using alkaline saponification waste water - Google Patents
Device for removing SO3 in flue gas of coal-fired power plant by using alkaline saponification waste water Download PDFInfo
- Publication number
- CN213556297U CN213556297U CN202021727009.XU CN202021727009U CN213556297U CN 213556297 U CN213556297 U CN 213556297U CN 202021727009 U CN202021727009 U CN 202021727009U CN 213556297 U CN213556297 U CN 213556297U
- Authority
- CN
- China
- Prior art keywords
- flue
- atomizing nozzle
- flue gas
- alkaline
- coal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model discloses an SO in coal fired power plant's flue gas is desorption to utilize alkaline saponification waste water3Of a device comprisingThe system comprises a saponification wastewater pretreatment system and an alkaline absorbent injection system, wherein the alkaline absorbent injection position is arranged in a flue between an economizer and an SCR reactor, a flue between the SCR reactor and an air preheater, a flue between the air preheater and an electric dust remover and a flue between the electric dust remover and a desulfurizing tower. The saponified wastewater is pretreated by a flocculation sedimentation tank, a quartz sand microfiltration tank and an air floatation tank, stored in an alkaline absorbent storage tank, sprayed into a flue by a metering pump, an air compressor and an atomizing nozzle, and mixed with SO in flue gas3Fully mixing and reacting to remove SO in flue gas3. The utility model has the advantages of being scientific and reasonable in structure, can let the SO in alkaline saponification waste water and flue gas3Fully react to SO in the flue gas3Good removing effect, changes waste into valuable, and greatly reduces the SO in the flue gas of the coal-fired boiler3The cost is removed, and the method is suitable for popularization and application.
Description
Technical Field
The utility model relates to a desorption coal fired boiler flue gas SO3In particular to a device and a method for removing SO in flue gas of a coal-fired power plant by using alkaline saponification waste water3The apparatus of (1).
Background
Part of SO is generated in the combustion process of a coal-fired power plant2，SO2Continuously oxidizing in the high-temperature environment in the furnace and in the SCR denitration system to generate SO3This fraction of SO3The existence of the additive is not only one of main causes of colored smoke and rain (such as blue smoke/yellow smoke) formation of the power plant, but also can be caused by water vapor and NH3Influence of reaction to produce ammonium sulfate or ammonium bisulfateCatalytic efficiency, in addition to the possibility of air preheater plugging and erosion of the back pass. SO of coal-fired power plants3Removal, domestic and foreign research institutions mainly focus on research on SO in flue gas by various alkaline absorbents3Removal effect of, including CaCO3、Ca(OH)2、MgO、NaHSO3Natural alkali absorbent, etc., wherein the sodium-based absorbent is used for SO in flue gas3The removal effect of (A) is better, but the problems of high cost of raw materials of the absorbent and the like exist in the actual use process.
In chemical plants and oil chemical plants, when soaps and oil products are produced by an oil foot saponification process, high-concentration alkaline organic alkaline saponification industrial wastewater containing a large amount of fatty acids, proteins, pigments, sodium chloride and sodium carbonate is inevitably produced. At present, the wastewater is treated by adopting a pretreatment and biochemical method in China. The large amount of alkaline substances in the saponified wastewater is a resource, and the SO in the flue gas discharged currently is3Is an acidic gas, if the alkaline saponification waste water and the acidic boiler flue gas are jointly treated, the operation cost can be reduced, and the aim of treating waste by waste can be achieved. Therefore, the utility model provides an utilize saponification waste water desorption coal fired boiler flue gas SO3The apparatus and method of (1).
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects existing in the prior art and provide a method for removing SO in flue gas of coal-fired power plants by using alkaline saponification wastewater3The device solves the problem of SO in the existing coal-fired flue gas3The removal needs more alkaline materials and has higher cost.
The utility model provides a technical scheme that above-mentioned problem adopted is: method for removing SO in flue gas of coal-fired power plant by using alkaline saponification wastewater3The device comprises a coal-fired boiler, an economizer, a flue, an ammonia injection grid, a static mixer, an SCR reactor, an air preheater, an electric dust remover, a desulfurizing tower and a chimney, and is characterized by further comprising a saponification wastewater pretreatment system and an alkaline absorbent injection system, wherein the saponification wastewater pretreatment system comprises a water inlet pipe, a flocculation sedimentation tank, a water outlet pipe, a water inlet pipe,the system comprises a quartz sand microfiltration tank and an air floatation treatment tank, wherein the alkaline absorbent injection system comprises a water delivery pipe, an alkaline absorbent storage tank, a metering pump, an air compressor, a first atomizing nozzle, a second atomizing nozzle, a third atomizing nozzle and a fourth atomizing nozzle; the coal-fired boiler, the economizer and the flue are sequentially connected, the flue is sequentially connected with an ammonia injection grid, a static mixer, an SCR (selective catalytic reduction) reactor, an air preheater, an electric dust remover and a desulfurizing tower according to the flow direction of flue gas, and the desulfurizing tower is connected with a chimney; the system comprises a water inlet pipe, a flocculation sedimentation tank, a quartz sand micro-filter, an air floatation treatment tank, an alkaline absorbent storage tank, a metering pump, an air compressor, an atomizing nozzle I, an atomizing nozzle II, an atomizing nozzle III and an atomizing nozzle IV, wherein the water inlet pipe is connected with the flocculation sedimentation tank, the quartz sand micro-filter and the air floatation treatment tank are sequentially connected, the air floatation treatment tank is connected with the alkaline absorbent storage tank through a water pipe, and the alkaline; the first atomizing nozzle is arranged in a flue between the coal economizer and the SCR reactor, the second atomizing nozzle is arranged in the flue between the SCR reactor and the air preheater, the third atomizing nozzle is arranged in the flue between the air preheater and the electric dust remover, and the fourth atomizing nozzle is arranged in the flue between the electric dust remover and the desulfurizing tower.
Further, a dosing device and a stirring device are arranged in the flocculation sedimentation tank and used for adding corresponding chemical agents to realize pretreatment of the wastewater.
Furthermore, an atomizing nozzle I in a flue between the economizer and the SCR reactor is arranged behind the ammonia injection grid and in front of the static mixer.
Furthermore, the pH value of the inlet water of the saponified wastewater is more than 10, and the NaOH content is more than 0.5 mg/L.
Furthermore, the first atomizing nozzle, the second atomizing nozzle, the third atomizing nozzle and the fourth atomizing nozzle enable the absorbent slurry to be atomized into liquid drops with the average particle size of less than 100 mu m in flue gas at the temperature of 150-950 ℃.
Compared with the prior art, the utility model, have following advantage and effect: SO in flue gas is removed by using saponified wastewater3The saponification waste water is used as a consumed alkaline material, and the waste is treated by the waste, so that the cost is greatly reduced; adopting wet atomization spraying technique, the atomization nozzle makes the absorbent slurry at 15The flue gas at 0-950 ℃ is atomized into liquid drops with the average particle size of less than 100 mu m, and compared with a dry spraying technology, the flue gas atomization agent has high contact degree with sulfur trioxide in the flue gas and good reaction effect; the saponified wastewater contains more nano-alkaline absorbent, SO3The removal effect is better than that of the calcium-based alkaline absorbent.
Drawings
FIG. 1 shows that the alkaline saponification waste water is utilized to remove SO in the flue gas of the coal-fired power plant3The overall structure of the device is shown schematically.
FIG. 2 is a schematic structural diagram of the saponification wastewater treatment and flue gas injection system of the present invention.
In the figure: the system comprises a water inlet pipe 1, a flocculation sedimentation tank 2, a quartz sand micro-filtration tank 3, an air floatation treatment tank 4, a water delivery pipe 5, an alkaline absorbent storage tank 6, a metering pump 7, an air compressor 8, a coal-fired boiler 9, an economizer 10, a flue 11, an ammonia injection grid 12, a first atomizing nozzle 13, a static mixer 14, an SCR reactor 15, a second atomizing nozzle 16, an air preheater 17, a third atomizing nozzle 18, an electric dust remover 19, a fourth atomizing nozzle 20, a desulfurizing tower 21 and a chimney 22.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Referring to fig. 1 to 2, a method for removing SO from flue gas of coal-fired power plant by using alkaline saponification waste water3The device comprises a coal-fired boiler 9, an economizer 10, a flue 11, an ammonia injection grid 12, a static mixer 14, an SCR reactor 15, an air preheater 17, an electric dust remover 19, a desulfurizing tower 21 and a chimney 22, and further comprises a saponification wastewater pretreatment system and an alkaline absorbent injection system, wherein the saponification wastewater pretreatment system comprises a water inlet pipe 1, a flocculation sedimentation tank 2, a quartz sand microfiltration tank 3 and an air floatation treatment tank 4, and the alkaline absorbent injection system comprises a water conveying pipe 5, an alkaline absorbent storage tank 6, a metering pump 7, an air compressor 8, an atomizing nozzle I13, an atomizing nozzle II 16, an atomizing nozzle III 18 and an atomizing nozzle IV 20; the coal-fired boiler 9, the economizer 10 and the flue 11 are connected in sequence, and the flue 11 is connected with an ammonia injection grid 12 and a static mixer in sequence according to the flowing direction of flue gasThe device comprises a combiner 14, an SCR reactor 15, an air preheater 17, an electric dust remover 19 and a desulfurizing tower 21, wherein the desulfurizing tower 21 is connected with a chimney 22; the water inlet pipe 1 is connected with the flocculation sedimentation tank 2, the quartz sand micro-filter 3 and the air floatation treatment tank 4 are sequentially connected, the air floatation treatment tank 4 is connected with the alkaline absorbent storage tank 6 through a water pipe 5, and the alkaline absorbent storage tank 6 is respectively connected with the first atomizing nozzle 13, the second atomizing nozzle 16, the third atomizing nozzle 18 and the fourth atomizing nozzle 20 through the metering pump 7 and the air compressor 8; the first atomizing nozzle 13 is arranged in the flue 11 between the coal economizer 10 and the SCR reactor 15, the second atomizing nozzle 16 is arranged in the flue 11 between the SCR reactor 15 and the air preheater 17, the third atomizing nozzle 18 is arranged in the flue 11 between the air preheater 17 and the electric dust remover 19, and the fourth atomizing nozzle 20 is arranged in the flue 11 between the electric dust remover 19 and the desulfurizing tower 21.
Specifically, a dosing device and a stirring device are arranged in the flocculation sedimentation tank 2 and used for adding corresponding chemical agents to realize the pretreatment of the wastewater.
Specifically, an atomizing nozzle 13 in the flue 11 between the economizer 10 and the SCR reactor 15 is disposed after the ammonia injection grid 12 and before the static mixer 14.
Specifically, the pH value of the inlet water of the saponified wastewater is more than 10, and the NaOH content is more than 0.5 mg/L.
Specifically, the first atomizing nozzle 13, the second atomizing nozzle 16, the third atomizing nozzle 18 and the fourth atomizing nozzle 20 atomize the absorbent slurry into liquid drops with the average particle size of less than 100 microns in flue gas at the temperature of 150-950 ℃.
Removal of SO from flue gas of coal-fired power plant by using alkaline saponification waste water3The working method of the device comprises the following steps: the saponified wastewater contains a large amount of fatty acid, protein, pigment, sodium chloride, sodium carbonate and other impurities, and is required to be subjected to certain pretreatment to remove the impurities and organic matters, the saponified wastewater enters a flocculation sedimentation tank 2 through a water inlet pipe 1, one or more of polyacrylamide, polyaluminum chloride and polyaluminum ferric chloride are added through a flocculation dosing device to fully settle suspended matters in the wastewater, the saponified wastewater after flocculation treatment is stood for clarification for a period of time, supernatant liquid overflows into a quartz sand microfiltration tank 3 to remove sediments in the wastewater, and separated supernatant liquid overflowsThe flow enters an air floatation treatment tank 4 to remove upper-layer organic matter impurities, separated clear liquid enters an alkaline absorbent storage tank 6 through a water conveying pipe 5, and then alkaline absorbent is respectively sprayed into a flue 11 between an economizer 10 and an SCR reactor 15, the flue 11 between the SCR reactor 15 and an air preheater 17, the flue 11 between the air preheater 17 and an electric dust remover 19 and the flue 11 between the electric dust remover 19 and a desulfurizing tower 21 through a metering pump 7 and an air compressor 8 by virtue of an atomizing nozzle I13, an atomizing nozzle II 16, an atomizing nozzle III 18 and an atomizing nozzle IV 20.
Taking a 600MW unit of a certain power plant as an example, the total smoke gas amount is 2 x 106Nm3Flow rate of alkaline absorbent: 5.5m3/h. Wherein the spray flow rates of the alkaline absorbent of the first atomizing nozzle 13, the second atomizing nozzle 16, the third atomizing nozzle 18 and the fourth atomizing nozzle 20 are respectively 2m3/h、2m3/h、1m3/h、0.5m3H, the particle diameter of the atomized liquid drop is 20-80 mu m, SO3The removal efficiency can reach more than 80 percent.
The utility model has the advantages of being scientific and reasonable in structure, can let the SO in alkaline saponification waste water and flue gas3Fully react to SO in the flue gas3Good removing effect, changes waste into valuable, and greatly reduces the SO in the flue gas of the coal-fired boiler3The cost is removed, and the method is suitable for popularization and application.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the scope of the present invention.
Claims (4)
1. Method for removing SO in flue gas of coal-fired power plant by using alkaline saponification wastewater3The device comprises a coal-fired boiler (9), an economizer (10), a flue (11), an ammonia injection grid (12), a static mixer (14), an SCR reactor (15), an air preheater (17), an electric dust remover (19), a desulfurizing tower (21) and a chimney(22) The system is characterized by further comprising a saponification wastewater pretreatment system and an alkaline absorbent injection system, wherein the saponification wastewater pretreatment system comprises a water inlet pipe (1), a flocculation sedimentation tank (2), a quartz sand micro-filter (3) and an air floatation treatment tank (4), and the alkaline absorbent injection system comprises a water pipe (5), an alkaline absorbent storage tank (6), a metering pump (7), an air compressor (8), a first atomizing nozzle (13), a second atomizing nozzle (16), a third atomizing nozzle (18) and a fourth atomizing nozzle (20); the coal-fired boiler (9), the economizer (10) and the flue (11) are sequentially connected, the flue (11) is sequentially connected with an ammonia injection grid (12), a static mixer (14), an SCR (selective catalytic reduction) reactor (15), an air preheater (17), an electric dust remover (19) and a desulfurizing tower (21) according to the flow direction of flue gas, and the desulfurizing tower (21) is connected with a chimney (22); the water inlet pipe (1) is connected with a flocculation sedimentation tank (2), the quartz sand micro-filter (3) and the air floatation treatment tank (4) are sequentially connected, the air floatation treatment tank (4) is connected with an alkaline absorbent storage tank (6) through a water pipe (5), and the alkaline absorbent storage tank (6) is respectively connected with a first atomizing nozzle (13), a second atomizing nozzle (16), a third atomizing nozzle (18) and a fourth atomizing nozzle (20) through a metering pump (7) and an air compressor (8); atomizing nozzle (13) set up in flue (11) between economizer (10) and SCR reactor (15), atomizing nozzle two (16) set up in flue (11) between SCR reactor (15) and air preheater (17), atomizing nozzle three (18) set up in flue (11) between air preheater (17) and electrostatic precipitator (19), atomizing nozzle four (20) set up in flue (11) between electrostatic precipitator (19) and desulfurizing tower (21).
2. The method for removing SO from flue gas of coal-fired power plant by using alkaline saponification waste water as claimed in claim 13The device is characterized in that a dosing device and a stirring device are arranged in the flocculation sedimentation tank (2) and used for adding corresponding chemical agents to realize the pretreatment of the wastewater.
3. The method for removing SO from flue gas of coal-fired power plant by using alkaline saponification waste water as claimed in claim 13The device is characterized in that a first atomizing nozzle (13) in a flue (11) between the economizer (10) and the SCR reactor (15) is arranged behind the ammonia injection grid (12) and in front of the static mixer (14).
4. The method for removing SO from flue gas of coal-fired power plant by using alkaline saponification waste water as claimed in claim 13The device is characterized in that the pH value of the saponification wastewater inlet water is more than 10, and the NaOH content is more than 0.5 mg/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021727009.XU CN213556297U (en) | 2020-08-18 | 2020-08-18 | Device for removing SO3 in flue gas of coal-fired power plant by using alkaline saponification waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021727009.XU CN213556297U (en) | 2020-08-18 | 2020-08-18 | Device for removing SO3 in flue gas of coal-fired power plant by using alkaline saponification waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213556297U true CN213556297U (en) | 2021-06-29 |
Family
ID=76555779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021727009.XU Active CN213556297U (en) | 2020-08-18 | 2020-08-18 | Device for removing SO3 in flue gas of coal-fired power plant by using alkaline saponification waste water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213556297U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112246079A (en) * | 2020-08-18 | 2021-01-22 | 华电电力科学研究院有限公司 | Device and method for removing SO3 in flue gas of coal-fired power plant by using alkaline saponification waste water |
-
2020
- 2020-08-18 CN CN202021727009.XU patent/CN213556297U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112246079A (en) * | 2020-08-18 | 2021-01-22 | 华电电力科学研究院有限公司 | Device and method for removing SO3 in flue gas of coal-fired power plant by using alkaline saponification waste water |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105056679A (en) | Method and device for removing PM2.5 (particulate matter) in WFGD (wet flue gas desulfurization) process | |
| CN106621766A (en) | Method and system for removing SO3 from boiler flue gas by using desulfurization waste water | |
| WO2018028425A1 (en) | Desulphurization wastewater zero-discharge system for removing fluorine and chlorine from coal-fired flue gas by semi-dry process | |
| CN205055726U (en) | Wet flue gas desulfurization in -process PM2. 5 desorption device | |
| CN112246079A (en) | Device and method for removing SO3 in flue gas of coal-fired power plant by using alkaline saponification waste water | |
| CN213556297U (en) | Device for removing SO3 in flue gas of coal-fired power plant by using alkaline saponification waste water | |
| CN104941435B (en) | A kind of semidry-method recirculating fluidized bed flue gas desulphurization system of normal temperature and method | |
| CN203170211U (en) | Ring-pipe rotational-flow wet-method flue gas desulfurization tower | |
| CN105032173A (en) | Device and process of ammonia-soda-process combined desulfurization and denitrification | |
| CN102847400A (en) | Flue gas dedusting and desulfurization system for medium-small size coal fired boiler | |
| CN209287031U (en) | A kind of sulfur dioxide minimum discharge desulfurizer being bubbled combination tower based on spray | |
| CN107308783B (en) | Wet-process simultaneous desulfurization and denitrification process for flue gas | |
| CN206508777U (en) | SO3 system in a kind of utilization desulfurization wastewater removing boiler smoke | |
| CN203458942U (en) | Ultrafine particle chemical agglomeration flocculation device based on wet desulphurization system | |
| CN105233604A (en) | Purification device for conducting flue gas desulfurization and dedusting on brick and tile kiln | |
| CN108383310A (en) | A kind of quenched desulfurization wastewater flue evaporation and cooperation-removal SO3Method | |
| CN204275795U (en) | A kind of Venturi tube | |
| CN208194090U (en) | The device of sulfur trioxide in flue gas is removed using desulfurization wastewater as carrier | |
| CN202478813U (en) | Wet flue gas desulphurization system used for coal-fired power plant boiler | |
| CN107096378A (en) | The flue gas desulphurization system and sulfur method of a kind of floatation glass production line | |
| CN201930709U (en) | Novel semi-dry process flue gas desulfurization device | |
| CN207722616U (en) | A kind of ultra-clean zero waste liquid dust arrester installation of discharge desulfurization of flue gas | |
| CN213853843U (en) | Thermal power tail gas treatment equipment | |
| CN102553425A (en) | Wet flue gas denitrifying system for coal fired power plant boiler | |
| CN109126435A (en) | A kind of double alkali method flue gas desulfurization technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |