CN219797267U - Hot air recirculation device of air preheater of gas boiler - Google Patents
Hot air recirculation device of air preheater of gas boiler Download PDFInfo
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- CN219797267U CN219797267U CN202320737888.1U CN202320737888U CN219797267U CN 219797267 U CN219797267 U CN 219797267U CN 202320737888 U CN202320737888 U CN 202320737888U CN 219797267 U CN219797267 U CN 219797267U
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- air
- air preheater
- preheater
- circulating
- hot air
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- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000007664 blowing Methods 0.000 abstract description 2
- 238000002425 crystallisation Methods 0.000 abstract description 2
- 230000008025 crystallization Effects 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 12
- 239000003546 flue gas Substances 0.000 description 12
- 239000007789 gas Substances 0.000 description 9
- 239000000779 smoke Substances 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Air Supply (AREA)
Abstract
The utility model relates to a hot air recirculation device of a gas boiler air preheater, which comprises: a pin removal device; a lower air preheater; the upper air preheater is arranged above the lower air preheater; the circulating air pipe is used for connecting the hot air outlet of the upper air preheater with the inlet of the lower air preheater; the induced draft fan is arranged on the circulating air pipe and is suitable for providing power for hot air in the circulating air pipe; the device utilizes the boiler system, has simple structure, does not need to additionally increase the blowing and heating device, can effectively improve the inlet temperature of the lower-stage air preheater under the condition of lower ambient temperature after the device is added, greatly relieves the crystallization corrosion condition of the denitration agent in the low-temperature air preheater, and avoids the corrosion to the pipeline of the lower-stage air preheater.
Description
Technical Field
The utility model relates to a gas boiler, in particular to a hot air recirculation device of a gas boiler air preheater.
Background
The flue gas emission of the blast furnace gas boiler reaches the standard under the national environmental protection regulation, so that desulfurization and denitration equipment for flue gas treatment is needed; the boiler is only provided with desulfurization equipment when the boiler is designed and installed, and then NO is generated in continuous operation X The content exceeds standard, in order to ensure that the discharged flue gas reaches the standard, an SNCR denitration device is additionally arranged in a boiler burner area, the denitration medicament component takes urea as a main body, and a plurality of biological calcium and additives are added; because the denitration problem is not considered in the initial design, after the SNCR denitration installation is finished, the inlet temperature of the lower air preheater is low, ammonium sulfate crystals are generated, the scaling of the air preheater is corroded, the pipeline of the lower air preheater is corroded, the flue gas is mixed with the air, and the heat exchange efficiency of the air preheater is affected;
in other words, due to the addition of the SNCR denitration device, the denitration agent is directly sprayed into the hearth, then the smoke generated by combustion is adsorbed on the lower-stage air preheater, and due to the fact that the temperature of the smoke in the lower-stage air preheater is lower, the temperature of the smoke in the low-temperature air preheater area is not high, the wall temperature is lower than the dew point of the smoke, condensation water drops are adhered to the smoke, and the smoke particles generated by combustion are condensed into blocks to be adhered on the lower-stage air preheater, so that a compound corrosion pipeline is formed;
in summary, how to prevent the flue gas from condensing on the lower air preheater becomes a problem to be solved by researchers in the field.
Disclosure of Invention
The utility model aims to solve the technical problems that: how to prevent the flue gas from condensing on the lower air preheater;
in order to solve the technical problems, the utility model adopts the following technical scheme:
the utility model relates to a hot air recirculation device of a gas boiler air preheater, which comprises: a pin removal device; a lower air preheater; the upper air preheater is arranged above the lower air preheater; the circulating air pipe is used for connecting the hot air outlet of the upper air preheater with the inlet of the lower air preheater; the induced draft fan is arranged on the circulating air pipe and is suitable for providing power for hot air in the circulating air pipe;
in the gas pot of this scheme, owing to increased the pin removal device, consequently can produce the flue gas in lower air preheater, in letting in the lower air preheater with the hot-blast of upper air preheater exit through the circulation tuber pipe, improve lower air preheater's temperature, lower air preheater's wall temperature is higher than flue gas dew point temperature this moment, avoids flue gas and air condensation to become the piece and corrodes lower air preheater's pipeline, and the draught fan provides power for the flow of air.
In order to control the flow velocity of hot air in the circulating air pipe, the utility model adopts the structure that an electric adjusting blade air door for controlling the air velocity is arranged on the circulating air pipe;
the flow velocity of the hot air in the circulating air pipe is controlled by remotely controlling the opening degree of the electric regulating vane air door.
In order to prevent the circulation air pipe from being deformed due to heating caused by hot air, the utility model adopts the structure that an expansion joint is also arranged on the circulation air pipe;
by arranging the expansion joint, the pipeline is prevented from being heated and expanded, and the expansion joint is more impact-resistant than rigid connection, so that the deformation can be absorbed.
The utility model has the beneficial effects that: the utility model relates to a hot air recirculation device of a gas boiler air preheater, which utilizes a boiler system, has a simple structure, does not need to additionally increase a blowing and heating device, can effectively improve the inlet temperature of a lower-level air preheater under the condition of low ambient temperature after the device is added, greatly relieves the crystallization corrosion condition of a denitration agent in the low-temperature air preheater, and avoids the corrosion to a pipeline of the lower-level air preheater.
Drawings
The utility model will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of the structure of the present utility model;
in the figure: 1-lower air preheater, 2-upper air preheater, 3-circulating air pipe, 4-hot air outlet, 5-induced draft fan, 6-electric regulating vane air door and 7-expansion joint.
Detailed Description
The utility model will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the utility model and therefore show only the structures which are relevant to the utility model.
As shown in fig. 1, the present utility model is a hot air recirculation device of a gas boiler air preheater, comprising: a pin removal device; a lower air preheater 1; an upper air preheater 2 disposed above the lower air preheater 1; a circulating air pipe 3 for connecting the hot air outlet 4 of the upper air preheater 2 with the inlet of the lower air preheater 1; the induced draft fan 5 is arranged on the circulating air pipe 3 and is suitable for providing power for hot air in the circulating air pipe 3;
in the gas pot of this scheme, owing to increased the pin removal device, consequently can produce the flue gas in lower air preheater, in letting in the lower air preheater with the hot-blast of upper air preheater exit through the circulation tuber pipe, improve lower air preheater's temperature, lower air preheater's wall temperature is higher than flue gas dew point temperature this moment, avoids flue gas and air condensation to become the piece and corrodes lower air preheater's pipeline, and the draught fan provides power for the flow of air.
As shown in fig. 1, in order to control the flow rate of hot air in the circulating air pipe, the utility model adopts the structure that an electric adjusting blade air door 6 for controlling the air speed is arranged on the circulating air pipe 3;
the flow velocity of the hot air in the circulating air pipe is controlled by remotely controlling the opening degree of the electric regulating vane air door.
As shown in fig. 1, in order to prevent the circulation duct from being deformed by hot air, the utility model adopts the circulation duct 3 provided with an expansion joint 7;
by arranging the expansion joint, the pipeline is prevented from being heated and expanded, and the expansion joint is more impact-resistant than rigid connection, so that the deformation can be absorbed.
With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.
Claims (3)
1. A gas boiler air preheater hot air recirculation device, comprising:
a pin removal device;
a lower air preheater;
the upper air preheater is arranged above the lower air preheater;
the circulating air pipe is used for connecting the hot air outlet of the upper air preheater with the inlet of the lower air preheater;
and the induced draft fan is arranged on the circulating air pipe and is suitable for providing power for hot air in the circulating air pipe.
2. The hot air recirculation device of the air preheater of the gas boiler according to claim 1, wherein an electric adjusting blade air door for controlling the air speed is arranged on the circulating air pipe.
3. The hot air recirculation device of a gas boiler air preheater according to claim 1, wherein an expansion joint is further arranged on the circulating air pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320737888.1U CN219797267U (en) | 2023-03-31 | 2023-03-31 | Hot air recirculation device of air preheater of gas boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320737888.1U CN219797267U (en) | 2023-03-31 | 2023-03-31 | Hot air recirculation device of air preheater of gas boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219797267U true CN219797267U (en) | 2023-10-03 |
Family
ID=88187983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320737888.1U Active CN219797267U (en) | 2023-03-31 | 2023-03-31 | Hot air recirculation device of air preheater of gas boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219797267U (en) |
-
2023
- 2023-03-31 CN CN202320737888.1U patent/CN219797267U/en active Active
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