CN219050873U - Flue gas desulfurization and denitrification device - Google Patents
Flue gas desulfurization and denitrification device Download PDFInfo
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- CN219050873U CN219050873U CN202223068898.5U CN202223068898U CN219050873U CN 219050873 U CN219050873 U CN 219050873U CN 202223068898 U CN202223068898 U CN 202223068898U CN 219050873 U CN219050873 U CN 219050873U
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Abstract
The utility model discloses a flue gas desulfurization and denitrification device which comprises a flue gas cooling device, an ozone generator, a pre-desulfurization tower, a main desulfurization tower, a magnesium hydroxide pulping system, a clean water tank and a chimney, wherein the flue gas cooling device is connected with the pre-desulfurization tower through a pipeline, the ozone generator is connected with the pre-desulfurization tower through a pipeline, the pre-desulfurization tower is connected with the lower part of the main desulfurization tower, the magnesium hydroxide pulping system is connected with the lower part of the main desulfurization tower through a pipeline, a main spraying mechanism for spraying slurry is arranged at the upper part in the main desulfurization tower, the main spraying mechanism is connected with the lower part of the main desulfurization tower through a pipeline, a cleaning mechanism is arranged above the main spraying mechanism in the main desulfurization tower, the clean water tank is connected with the cleaning mechanism through a pipeline, and the outlet of the main desulfurization tower is connected with the chimney through a pipeline. The device can fully cool the flue gas, and has high desulfurization and denitrification efficiency and good effect.
Description
Technical Field
The utility model relates to the technical field of flue gas treatment, in particular to a flue gas desulfurization and denitrification device.
Background
At present, the flue gas desulfurization technology for the coal-fired industry is relatively mature, and particularly the limestone-gypsum method for large-scale desulfurization of the power plant is the most mature, but the investment cost is too high, and the method is only suitable for purifying the power plant flue gas with extremely large flue gas scale and higher sulfur content, and is difficult to be used in coking flue gas desulfurization occasions with relatively lower sulfur content; the other flue gas desulfurization processes with smaller scale have a plurality of problems, and can not be directly carried in coking flue gas desulfurization occasions. In particular, in the simple lime method or the double alkali method, the obtained calcium sulfite is not fully oxidized, so that the calcium sulfite is difficult to prepare gypsum, the amount of recoverable gypsum is small, and the investment cost of adding a gypsum recovery device is excessively high. And before desulfurization and denitrification, the flue gas needs to be cooled, but the current cooling device has poor cooling effect and low cooling efficiency so as to influence the subsequent desulfurization and denitrification work.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a flue gas desulfurization and denitrification device to solve the problems in the background art.
In order to solve the technical problems, the utility model provides the following technical scheme:
the utility model provides a flue gas desulfurization denitrification facility, includes flue gas heat sink, ozone generator, pre-desulfurizing tower, main desulfurizing tower, magnesium hydroxide slurrying system, clean water tank and chimney, the flue gas heat sink passes through the pipeline to be connected with pre-desulfurizing tower, and ozone generator passes through the pipeline to be connected with pre-desulfurizing tower, and pre-desulfurizing tower is connected with the lower part of main desulfurizing tower, magnesium hydroxide slurrying system passes through the pipeline to be connected with the lower part of main desulfurizing tower, and upper portion in the main desulfurizing tower is equipped with the main spraying mechanism who sprays the thick liquid, and main spraying mechanism passes through the pipeline to be connected with the lower part of main desulfurizing tower, and the top that lies in main spraying mechanism in the main desulfurizing tower is equipped with wiper mechanism, and the clean water tank passes through the pipeline to be connected with wiper mechanism, and the exit of main desulfurizing tower passes through the pipeline to be connected with the chimney.
Preferably, the flue gas cooling device further comprises a dust remover, wherein the dust remover is arranged in front of the flue gas cooling device.
Above-mentioned technical scheme carries out preliminary dust removal through the dust remover to the flue gas, and rethread flue gas heat sink reduces flue gas temperature to carry out the SOx/NOx control of next step.
Preferably, the flue gas cooling device comprises a plurality of cooling boxes, one end of each cooling box is provided with an air inlet, the other end of each cooling box is provided with an air outlet, an air inlet branch pipe is connected to the air inlet of each cooling box, an air outlet branch pipe is connected to the air outlet of each cooling box, all air inlet branch pipes are connected to an air inlet main pipe, all air outlet branch pipes are connected to an air outlet main pipe, the air inlet main pipe is connected to a dust remover through a pipeline, and the air outlet main pipe is connected to a pre-desulfurization tower; the bottom surface of cooling box is connected with two switching pieces, and one of them switching piece internal connection has the feed liquor house steward, and another switching piece internal connection has the play liquid house steward, be connected with a plurality of curved transfer lines on the feed liquor house steward, the transfer line is located the inside of cooling box, and transfer line and cooling box sealing connection, the other end and the play liquid house steward of transfer line are connected, and the coolant liquid flows to in all transfer lines by the feed liquor house steward to by play liquid house steward outflow.
Above-mentioned technical scheme, flue gas gets into the air inlet header pipe by the pipeline to get into the cooler bin by the air inlet branch pipe, the coolant liquid gets into by the air inlet header pipe simultaneously, and shunts to the transfer line, after the flue gas gets into the cooler bin, fully contact with all transfer lines, play the effect of cooling, and cooling efficiency is high, effectual.
Preferably, a pre-spraying mechanism is arranged in the pre-desulfurization tower and is connected with the lower part of the main desulfurization tower through a pipeline.
According to the technical scheme, the slurry in the main desulfurizing tower is sent into the pre-desulfurizing tower through the pipeline, and part of sulfur dioxide and NO in the flue gas are removed 2 And (5) removing.
Preferably, a cyclone is arranged below the main spraying mechanism in the main desulfurizing tower, and a demister is arranged above the cleaning mechanism in the main desulfurizing tower.
According to the technical scheme, the cyclone can be used for gas-liquid separation, liquid falls into the bottom of the main desulfurizing tower, and flue gas moves upwards; the demister can capture fog particles and slurry drops carried by flue gas in the spray absorption process, and prevent downstream equipment such as a bright gas heater, an induced draft fan (commonly used for industrial boiler desulfurization), a flue and the like from being influenced.
Compared with the prior art, the utility model has the following beneficial effects:
the flue gas enters the air inlet main pipe through the pipeline and enters the cooling box through the air inlet branch pipe, meanwhile, the cooling liquid enters through the liquid inlet main pipe and is split into each infusion tube, and after entering the cooling box, the flue gas is fully contacted with all the infusion tubes, so that the cooling effect is achieved, and the cooling efficiency is high and the effect is good; then the cooled flue gas enters a pre-desulfurizing tower to partially remove sulfur dioxide and NO in the flue gas 2 The flue gas after pre-desulfurization and denitrification enters a main body desulfurization and denitrification tower, and desulfurization and denitrification are continuously carried out under the action of magnesium hydroxide and a small amount of oxidation additives (hydrogen peroxide), meanwhile, the flue gas can completely reach the emission standard after fog drops carried by the flue gas are captured, and the flue gas is discharged through a chimney, so that the desulfurization and denitrification effect is good; the magnesium hydroxide solution absorbs sulfur dioxide and nitrogen oxides, then is converted into magnesium sulfite, and is converted into magnesium sulfate and magnesium nitrate after air oxidation (performed at the bottom of the absorption tower) for subsequent treatment.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a top view of the flue gas temperature reduction device;
FIG. 3 is a cross-sectional view of the cooling box;
in the figure: 1-flue gas cooling device, 101-cooling box, 102-air inlet, 103-air outlet, 104-air inlet branch pipe, 105-air outlet branch pipe, 106-air inlet main pipe, 107-air outlet main pipe, 108-adapter block, 109-liquid inlet main pipe, 110-liquid outlet main pipe, 111-transfer line, 2-ozone generator, 3-pre-desulfurizing tower, 4-main desulfurizing tower, 5-magnesium hydroxide pulping system, 6-clean water tank, 7-chimney, 8-main spraying mechanism, 9-cleaning mechanism, 10-dust remover, 11-pre-spraying mechanism, 12-cyclone and 13-demister.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-3, a flue gas desulfurization and denitrification device comprises a flue gas cooling device 1, an ozone generator 2, a pre-desulfurization tower 3, a main desulfurization tower 4, a magnesium hydroxide pulping system 5, a clean water tank 6, a chimney 7 and a dust remover 10, wherein the dust remover 10 is connected with the flue gas cooling device 1 through a pipeline, the flue gas cooling device 1 is connected with the pre-desulfurization tower 3 through a pipeline, the ozone generator 2 is connected with the pre-desulfurization tower 3 through a pipeline, the pre-desulfurization tower 3 is connected with the lower part of the main desulfurization tower 4, the magnesium hydroxide pulping system 5 is connected with the lower part of the main desulfurization tower 4 through a pipeline, a main spraying mechanism 8 for spraying slurry is arranged at the upper part in the main desulfurization tower 4, a cleaning mechanism 9 is arranged above the main spraying mechanism 8 in the main desulfurization tower 4, the clean water tank 6 is connected with the cleaning mechanism 9 through a pipeline, and the outlet of the main desulfurization tower 4 is connected with the chimney 7 through a pipeline.
In this embodiment, referring to fig. 2 and 3, the flue gas cooling device 1 includes a plurality of cooling boxes 101, one end of each cooling box 101 is provided with an air inlet 102, the other end is provided with an air outlet 103, an air inlet branch pipe 104 is connected to the air inlet 102 of each cooling box, an air outlet branch pipe 105 is connected to the air outlet 103 of each cooling box, all the air inlet branch pipes 104 are connected to an air inlet manifold 106, all the air outlet branch pipes 105 are connected to an air outlet manifold 107, the air inlet manifold 106 is connected to the dust remover 10 through a pipeline, and the air outlet manifold 107 is connected to the pre-desulfurization tower 3; the bottom surface of cooling tank 101 is connected with two adapter blocks 108, and one of them adapter block 108 internal connection has feed liquor house steward 109, and another adapter block 108 internal connection has play liquid house steward 110, be connected with a plurality of transfer lines 111 that are the arc on the feed liquor house steward 109, transfer line 111 is located the inside of cooling tank 101, and transfer line 111 and cooling tank 101 sealing connection, the other end and the play liquid house steward 110 of transfer line are connected, and the coolant liquid flows into all transfer lines 111 by feed liquor house steward 109 to by play liquid house steward 110 outflow. The flue gas enters the air inlet manifold 106 through the pipeline and enters the cooling box 101 through the air inlet branch pipe 104, meanwhile, the cooling liquid enters through the liquid inlet manifold 109 and is split into the infusion tubes 111, and after entering the cooling box 101, the flue gas is fully contacted with all the infusion tubes 111, so that the cooling effect is achieved, and the cooling efficiency is high and the cooling effect is good.
In this embodiment, a pre-spraying mechanism 11 is disposed in the pre-desulfurizing tower 3, and the pre-spraying mechanism 11 is connected with the lower portion of the main desulfurizing tower 4 through a pipeline. The slurry in the main desulfurizing tower is sent into a pre-desulfurizing tower through a pipeline to partially remove sulfur dioxide and NO in the flue gas 2 And (5) removing.
The main spraying mechanism, the pre-spraying mechanism and the cleaning mechanism all comprise a water spraying pipe and a nozzle arranged on the water spraying pipe.
In this embodiment, a cyclone 12 is disposed in the main desulfurizing tower 4 below the main spraying mechanism 8, and a demister 13 is disposed in the main desulfurizing tower 4 above the cleaning mechanism 9. The cyclone 12 can separate gas from liquid, the liquid falls into the bottom of the main desulfurizing tower, and the flue gas moves upwards; mist particles and slurry droplets carried by flue gas in the spray absorption process can be captured by the demister 13, so that influences on downstream equipment such as a bright gas heater, an induced draft fan (commonly used for desulfurization of industrial boilers), a flue and the like are prevented.
The working principle of the utility model is as follows:
the flue gas from the coking furnace is filtered by dust remover 10 to remove dust particles, then cooled by flue gas cooling device 1, enters into pre-desulfurizing tower 3, ozone generated by ozone generator 2 is injected into pre-desulfurizing tower 3 and is quickly mixed with flue gas, NO in flue gas will quickly react with ozone to form NO which can be absorbed by downstream desulfurizing liquid 2 The method comprises the steps of (1) using a desulfurization solution obtained after circulating in a main desulfurization tower 4 for a certain time as a spray solution of the pre-desulfurization tower to treat part of sulfur dioxide and NO in flue gas by using an oxide with an equal valence state in the pre-desulfurization tower 3 2 Removing, introducing the flue gas subjected to pre-desulfurization and denitrification 3 into a main desulfurization tower 4, continuously desulfurizing and denitrifying under the action of magnesium hydroxide and a small amount of oxidation additive (hydrogen peroxide), desulfurizing and utilizing magnesium oxide (magnesium hydroxide) as a first desulfurizing agent, pulping by a magnesium oxide pulping system, introducing the slurry into the main desulfurization tower 4, and fully mixing with hot flue gasThe contact and absorption of sulfur dioxide and nitrogen oxides in high valence state reach the purpose of desulfurization, at the same time, the fog drops carried by the flue gas are captured, then the flue gas can completely reach the emission standard, and is discharged by the chimney 7, after absorbing sulfur dioxide and nitrogen oxides, the magnesium hydroxide solution is converted into magnesium sulfite, and after air oxidation (carried out at the bottom of the absorption tower), the magnesium sulfite and magnesium nitrate are converted.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a flue gas desulfurization denitrification facility, its characterized in that, including flue gas heat sink (1), ozone generator (2), advance desulfurizing tower (3), main desulfurizing tower (4), magnesium hydroxide slurrying system (5), clean water tank (6) and chimney (7), flue gas heat sink (1) are connected with advance desulfurizing tower (3) through the pipeline, and ozone generator (2) are connected with advance desulfurizing tower (3) through the pipeline, advance desulfurizing tower (3) and main desulfurizing tower (4) lower part and be connected, magnesium hydroxide slurrying system (5) and main desulfurizing tower (4) lower part are through pipe connection, and upper portion in main desulfurizing tower (4) is equipped with the main spraying mechanism (8) of spraying thick liquid, and main spraying mechanism (8) are connected with main desulfurizing tower (4) lower part through the pipeline, and the top that is located main spraying mechanism (8) in main desulfurizing tower (4) is equipped with wiper mechanism (9), and clean water tank (6) are connected with wiper mechanism (9) through the pipeline, and the exit of main desulfurizing tower (4) is connected with chimney (7) through the pipeline.
2. The flue gas desulfurization and denitrification device according to claim 1, wherein: the flue gas cooling device further comprises a dust remover (10), wherein the dust remover (10) is arranged in front of the flue gas cooling device (1).
3. The flue gas desulfurization and denitrification device according to claim 2, wherein: the flue gas cooling device (1) comprises a plurality of cooling boxes (101), one end of each cooling box (101) is provided with an air inlet (102), the other end of each cooling box is provided with an air outlet (103), each cooling box is connected with an air inlet branch pipe (104), each cooling box is connected with an air outlet branch pipe (105), all the air inlet branch pipes (104) are connected with an air inlet main pipe (106), all the air outlet branch pipes (105) are connected with an air outlet main pipe (107), the air inlet main pipe (106) is connected with a dust remover (10) through a pipeline, and the air outlet main pipe (107) is connected with a pre-desulfurization tower (3); the cooling box (101) bottom surface is connected with two adapter blocks (108), and one of them adapter block (108) internal connection has feed liquor house steward (109), and another adapter block (108) internal connection has play liquid house steward (110), be connected with a plurality of transfer lines (111) that are the arc on feed liquor house steward (109), transfer line (111) are located the inside of cooling box (101), and transfer line (111) and cooling box (101) sealing connection, and the other end and the play liquid house steward (110) of transfer line are connected, and the coolant liquid flows into in all transfer lines (111) by feed liquor house steward (109) to flow out by play liquid house steward (110).
4. The flue gas desulfurization and denitrification device according to claim 1, wherein: the pre-desulfurization tower (3) is internally provided with a pre-spraying mechanism (11), and the pre-spraying mechanism (11) is connected with the lower part of the main desulfurization tower (4) through a pipeline.
5. The flue gas desulfurization and denitrification device according to any one of claims 1 to 4, wherein: the cyclone (12) is arranged below the main spraying mechanism (8) in the main desulfurizing tower (4), and the demister (13) is arranged above the cleaning mechanism (9) in the main desulfurizing tower (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223068898.5U CN219050873U (en) | 2022-11-19 | 2022-11-19 | Flue gas desulfurization and denitrification device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223068898.5U CN219050873U (en) | 2022-11-19 | 2022-11-19 | Flue gas desulfurization and denitrification device |
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| CN219050873U true CN219050873U (en) | 2023-05-23 |
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| CN202223068898.5U Active CN219050873U (en) | 2022-11-19 | 2022-11-19 | Flue gas desulfurization and denitrification device |
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