CN209865774U - Flue gas denitration device for improving vaporization effect of ammonia water - Google Patents
Flue gas denitration device for improving vaporization effect of ammonia water Download PDFInfo
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- CN209865774U CN209865774U CN201920549466.5U CN201920549466U CN209865774U CN 209865774 U CN209865774 U CN 209865774U CN 201920549466 U CN201920549466 U CN 201920549466U CN 209865774 U CN209865774 U CN 209865774U
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Abstract
The utility model discloses an improve flue gas denitration device of aqueous ammonia vaporization effect, include: the device comprises an SCR (selective catalytic reduction) reactor (1), an ammonia spraying grid (2), an ammonia water evaporation tank (3), a dilution fan (4), a steam heater (5), a flue gas pipeline (10), a fan air inlet pipeline (11), an ammonia gas supply pipeline (12), an ammonia water supply pipeline (13) and a compressed air supply pipeline (14). The utility model has the advantages that: the flue gas can obtain better denitration effect through the utility model; the hot flue gas is used as a heat source of the ammonia water evaporation tank, so that additional energy can be saved; the side wall connecting point of the air inlet pipeline of the fan and the SCR reactor is positioned below the flue gas rectifier and above the first catalyst layer, so that the air extraction amount of the dilution fan is sufficient, the temperature is high, and the vaporization effect of ammonia water is improved; the utility model discloses use vertical aqueous ammonia evaporation tank, be favorable to the vaporization of aqueous ammonia.
Description
Technical Field
The utility model relates to a flue gas denitration field especially relates to an improve flue gas denitration device of aqueous ammonia vaporization effect.
Background
The ammonia water evaporating tank of the existing flue gas denitration device mostly adopts steam heating, a large amount of heat energy is wasted, and flue gas is also adopted for heating, but the temperature provided for the ammonia water evaporating tank is not high enough, the ammonia water vaporization effect is poor, and the effect of subsequent denitration reaction is influenced.
Disclosure of Invention
In order to solve the problem that proposes in the above-mentioned background art, the utility model discloses an improve flue gas denitration device of aqueous ammonia vaporization effect, include: the device comprises an SCR reactor, an ammonia spraying grid, an ammonia water evaporation tank, a dilution fan, a steam heater, a flue gas pipeline, a fan air inlet pipeline, an ammonia gas supply pipeline, an ammonia water supply pipeline and a compressed air supply pipeline, and is characterized in that a flue gas heat exchanger is arranged in a flue gas outlet at the lower part of the SCR reactor and used for heating flue gas passing through the flue gas heat exchanger; the inlet of the flue gas heat exchanger is connected with the flue gas pipeline; the outlet of the flue gas heat exchanger is connected with the inlet of the steam heater through a pipeline; the steam heater is used for heating the flue gas passing through the steam heater; the outlet of the steam heater is connected with one inlet of the ammonia spraying grid through a pipeline; the outlet of the ammonia injection grid is connected with the inlet of the SCR reactor; the ammonia spraying grid is used for spraying ammonia gas into the smoke passing through the ammonia spraying grid; the ammonia water supply pipeline and the compressed air supply pipeline are combined and then connected with an inlet on the side wall of the ammonia water evaporation tank, and are used for supplying ammonia water into the ammonia water evaporation tank; the air inlet pipeline of the fan is connected with the side wall of the SCR reactor; the inlet of the dilution fan is connected with the air inlet pipeline of the fan; the outlet of the dilution fan is connected with the inlet at the bottom of the ammonia water evaporation tank; the dilution fan conveys part of the flue gas passing through the SCR reactor to the ammonia water evaporation tank to be used as a heat source to vaporize the ammonia water in the ammonia water evaporation tank, and the vaporized ammonia water is connected with the ammonia spraying grid through the ammonia gas supply pipeline; a second catalyst layer is arranged in the SCR reactor and used for loading a catalyst required by the flue gas denitration reaction; the second catalyst layer is positioned above the flue gas heat exchanger.
Preferably, the ammonia water evaporation tank is of a vertical cylindrical structure, and conical end enclosures are adopted for the end enclosures at the top and the bottom.
Preferably, a flue gas rectifier is arranged at the top of the SCR reactor.
Preferably, the side wall of the SCR reactor is provided with a sound wave soot blower for removing dust in the SCR reactor.
Preferably, a first catalyst layer is arranged inside the SCR reactor; the first catalyst layer is positioned below the flue gas rectifier and above the second catalyst layer; the first catalyst layer is a spare layer for replacing the second catalyst layer.
Preferably, the dilution fan is provided with two fans, wherein one fan works, and the other fan is standby.
Preferably, the connection point of the air inlet pipeline of the fan and the side wall of the SCR reactor is located below the flue gas rectifier and above the first catalyst layer.
The utility model has the advantages that: the flue gas can obtain better denitration effect through the utility model; the hot flue gas is used as a heat source of the ammonia water evaporation tank, so that additional energy can be saved; the side wall connecting point of the air inlet pipeline of the fan and the SCR reactor is positioned below the flue gas rectifier and above the first catalyst layer, so that the air extraction amount of the dilution fan is sufficient, the temperature is high, and the vaporization effect of ammonia water is improved; the utility model discloses use vertical aqueous ammonia evaporation tank, be favorable to the vaporization of aqueous ammonia.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
The parts in the drawings are numbered as follows: an SCR reactor 1; an ammonia injection grid 2; an ammonia water evaporation tank 3; a dilution fan 4; a steam heater 5; a sound wave soot blower 6; a flue gas rectifier 7; the first catalyst layer 8; the second catalyst layer 9; a flue gas duct 10; a fan air inlet pipeline 11; an ammonia gas supply line 12; an ammonia water supply line 13; a compressed air supply duct 14; a flue gas heat exchanger 15.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the invention can be more easily understood by those skilled in the art, thereby making the scope of the invention more clearly defined.
Example 1
Referring to fig. 1, a flue gas denitration device for improving vaporization effect of ammonia water comprises: the device comprises an SCR reactor 1, an ammonia spraying grid 2, an ammonia water evaporation tank 3, a dilution fan 4, a steam heater 5, a flue gas pipeline 10, a fan air inlet pipeline 11, an ammonia gas supply pipeline 12, an ammonia water supply pipeline 13 and a compressed air supply pipeline 14, and is characterized in that a flue gas heat exchanger 15 is arranged inside a flue gas outlet at the lower part of the SCR reactor 1 and used for heating flue gas passing through the flue gas heat exchanger 15; the inlet of the flue gas heat exchanger 15 is connected with the flue gas pipeline 10; the outlet of the flue gas heat exchanger 15 is connected with the inlet of the steam heater 5 through a pipeline; the steam heater 5 is used for heating the flue gas passing through the steam heater 5; the outlet of the steam heater 5 is connected with one inlet of the ammonia spraying grid 2 through a pipeline; the outlet of the ammonia injection grid 2 is connected with the inlet of the SCR reactor 1; the ammonia injection grid 2 is used for injecting ammonia gas into the flue gas passing through the ammonia injection grid 2; the ammonia water supply pipeline 13 and the compressed air supply pipeline 14 are combined and then connected with an inlet on the side wall of the ammonia water evaporation tank 3, and are used for supplying ammonia water into the ammonia water evaporation tank 3; the fan air inlet pipeline 11 is connected with the side wall of the SCR reactor 1; the inlet of the dilution fan 4 is connected with the fan air inlet pipeline 11; the outlet of the dilution fan 4 is connected with the inlet at the bottom of the ammonia water evaporation tank 3; the dilution fan 4 conveys part of the flue gas passing through the SCR reactor 1 to the ammonia water evaporation tank 3, the flue gas is used as a heat source to vaporize the ammonia water in the ammonia water evaporation tank 3, and the vaporized ammonia water is connected with the ammonia spraying grid 2 through the ammonia gas supply pipeline 12; a second catalyst layer 9 is arranged in the SCR reactor 1 and used for loading a catalyst required by the flue gas denitration reaction; the second catalyst layer 9 is located above the flue gas heat exchanger 15.
The ammonia water evaporating tank 3 is of a vertical cylindrical structure, and conical end sockets are adopted at the top and the bottom of the ammonia water evaporating tank.
And a flue gas rectifier 7 is arranged at the top of the SCR reactor 1.
And the side wall of the SCR reactor 1 is provided with a sound wave soot blower 6 for removing dust in the SCR reactor 1.
A first catalyst layer 8 is arranged in the SCR reactor 1; the first catalyst layer 8 is located below the flue gas rectifier 7 and above the second catalyst layer 9; the first catalyst layer 8 is a spare layer for replacing the second catalyst layer 9.
The dilution fan 4 is provided with two fans, wherein one fan works, and the other fan is standby.
And the connection point of the fan air inlet pipeline 11 and the side wall of the SCR reactor 1 is positioned below the flue gas rectifier 7 and above the first catalyst layer 8.
The utility model discloses a theory of operation: flue gas at the outlet of the bag-type dust collector enters a flue gas heat exchanger 15 through a flue gas pipeline 10 to be heated for the first time, then enters a steam heater 5 to be heated for the second time, then enters an ammonia spraying grid 2 to be mixed with ammonia gas, then enters an SCR reactor 1, completes denitration reaction on a second catalyst layer 9 through a flue gas rectifier 7, and then enters a subsequent discharge pipeline.
The ammonia gas of the ammonia spraying grid 2 is obtained from the vaporized ammonia water in the ammonia water evaporation tank 3. The heat source of the ammonia water evaporation tank 3 is derived from part of flue gas in the SCR reactor 1 extracted by the dilution fan 4; the ammonia water in the ammonia water evaporation tank 3 is supplied by the combination of an ammonia water supply pipe 13 and a compressed air supply pipe 14.
In the embodiment 1, the pressure at the inlet of the air inlet pipeline 11 of the fan is-3300 +/-100 Pa, the suction force of the dilution fan 4 is sufficient, the temperature is high, the temperature of the heat source of the ammonia water evaporation tank 3 is increased to 170 +/-5 ℃ from the original temperature of 150 +/-5 ℃, the vaporization effect of SCR ammonia water is improved, the temperature is increased, and a better denitration effect is achieved.
The above, only be the preferred embodiment of the present invention, not for limiting the present invention, all the technical matters of the present invention should be included in any slight modification, equivalent replacement and improvement made to the above embodiments by the technical matters of the present invention within the scope of the present invention.
Claims (7)
1. The utility model provides an improve flue gas denitration device of aqueous ammonia vaporization effect, includes: the device comprises an SCR (selective catalytic reduction) reactor (1), an ammonia spraying grid (2), an ammonia water evaporation tank (3), a dilution fan (4), a steam heater (5), a flue gas pipeline (10), a fan air inlet pipeline (11), an ammonia gas supply pipeline (12), an ammonia water supply pipeline (13) and a compressed air supply pipeline (14), and is characterized in that a flue gas heat exchanger (15) is arranged inside a flue gas outlet at the lower part of the SCR reactor (1) and used for heating flue gas passing through the flue gas heat exchanger (15); the inlet of the flue gas heat exchanger (15) is connected with the flue gas pipeline (10); the outlet of the flue gas heat exchanger (15) is connected with the inlet of the steam heater (5) through a pipeline; the steam heater (5) is used for heating the flue gas passing through the steam heater (5); the outlet of the steam heater (5) is connected with one inlet of the ammonia spraying grid (2) through a pipeline; the outlet of the ammonia injection grid (2) is connected with the inlet of the SCR reactor (1); the ammonia injection grid (2) is used for injecting ammonia gas into the smoke passing through the ammonia injection grid (2); the ammonia water supply pipeline (13) and the compressed air supply pipeline (14) are combined and then connected with an inlet on the side wall of the ammonia water evaporation tank (3) and used for supplying ammonia water into the ammonia water evaporation tank (3); the fan air inlet pipeline (11) is connected with the side wall of the SCR reactor (1); the inlet of the dilution fan (4) is connected with the fan air inlet pipeline (11); the outlet of the dilution fan (4) is connected with the inlet at the bottom of the ammonia water evaporation tank (3); the dilution fan (4) conveys part of the flue gas passing through the SCR reactor (1) to the ammonia water evaporation tank (3) to be used as a heat source to vaporize the ammonia water in the ammonia water evaporation tank (3), and the vaporized ammonia water is connected with the ammonia spraying grid (2) through the ammonia gas supply pipeline (12); a second catalyst layer (9) is arranged in the SCR reactor (1) and used for loading a catalyst required by the flue gas denitration reaction; the second catalyst layer (9) is located above the flue gas heat exchanger (15).
2. The flue gas denitration device for improving the vaporization effect of ammonia water as claimed in claim 1, wherein said ammonia water evaporation tank (3) is of a vertical cylindrical structure and the top and bottom end enclosures are both conical end enclosures.
3. The flue gas denitration device for improving the vaporization effect of ammonia water as claimed in claim 1, wherein a flue gas rectifier (7) is arranged on the top of the SCR reactor (1).
4. The flue gas denitration device for improving the vaporization effect of ammonia water as claimed in claim 1, wherein a sound wave soot blower (6) is arranged on the side wall of the SCR reactor (1) for removing dust inside the SCR reactor (1).
5. The flue gas denitration device for improving vaporization effect of ammonia water according to claim 3, wherein a first catalyst layer (8) is arranged inside the SCR reactor (1); the first catalyst layer (8) is positioned below the flue gas rectifier (7) and above the second catalyst layer (9); the first catalyst layer (8) is a spare layer for replacing the second catalyst layer (9).
6. The flue gas denitration device for improving the vaporization effect of ammonia water as claimed in claim 1, wherein two dilution fans (4) are provided, one of them is working, and the other is standby.
7. The flue gas denitration device for improving ammonia water vaporization effect according to claim 5, wherein the side wall connection point of the fan air inlet pipe (11) and the SCR reactor (1) is located below the flue gas rectifier (7) and above the first catalyst layer (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920549466.5U CN209865774U (en) | 2019-04-22 | 2019-04-22 | Flue gas denitration device for improving vaporization effect of ammonia water |
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| CN201920549466.5U CN209865774U (en) | 2019-04-22 | 2019-04-22 | Flue gas denitration device for improving vaporization effect of ammonia water |
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| CN209865774U true CN209865774U (en) | 2019-12-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113019121A (en) * | 2021-04-12 | 2021-06-25 | 萍乡学院 | Low-temperature SCR (selective catalytic reduction) flue gas denitration device for household garbage incineration plant |
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2019
- 2019-04-22 CN CN201920549466.5U patent/CN209865774U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113019121A (en) * | 2021-04-12 | 2021-06-25 | 萍乡学院 | Low-temperature SCR (selective catalytic reduction) flue gas denitration device for household garbage incineration plant |
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