CN220601505U - Boiler flue gas flow regulating system based on flue gas recirculation - Google Patents
Boiler flue gas flow regulating system based on flue gas recirculation Download PDFInfo
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- CN220601505U CN220601505U CN202322298255.8U CN202322298255U CN220601505U CN 220601505 U CN220601505 U CN 220601505U CN 202322298255 U CN202322298255 U CN 202322298255U CN 220601505 U CN220601505 U CN 220601505U
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- flue gas
- valve
- fan
- recirculation
- inlet
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 239000003546 flue gas Substances 0.000 title claims abstract description 94
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 17
- 239000000428 dust Substances 0.000 claims abstract description 26
- 238000004064 recycling Methods 0.000 claims abstract description 9
- 230000003750 conditioning effect Effects 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 9
- 238000002485 combustion reaction Methods 0.000 abstract description 6
- 239000000779 smoke Substances 0.000 abstract description 6
- 238000005299 abrasion Methods 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model belongs to the technical field of boiler combustion, and discloses a boiler flue gas flow regulating system based on flue gas recirculation, which comprises a boiler body, an air preheater, a dust remover, an induced draft fan, a primary fan, a secondary fan, a chimney and a plurality of valves for regulating the flow of boiler flue gas; the boiler body, the air preheater, the dust remover, the induced draft fan and the chimney are sequentially arranged along the smoke discharge direction; the outlet of the induced draft fan is divided into two paths, the main path is connected with the chimney, and the recycling bypass is respectively connected with the primary air fan, the secondary air fan and the boiler body; the primary fan and the secondary fan can also be directly connected with the atmosphere. By adopting the utility model, the flue gas quantity can be supplemented during deep peak regulation, the oxygen quantity and the abrasion to the fan are reduced, the generation of nitrogen oxides is reduced, the convection heat absorption can be enhanced, the temperature of working medium in a heating surface can be effectively improved, the air temperature at the inlet of the air preheater can be increased, the boiler efficiency is improved, and the wall temperature of the vertical water-cooled wall and the screen-type superheater can be regulated during low load.
Description
Technical Field
The utility model belongs to the technical field of boiler combustion, and particularly relates to a boiler flue gas flow regulating system based on flue gas recirculation.
Background
The coal-fired power generation is used as a large-scale controllable power supply, the generated energy of the coal-fired power generation accounts for more than 60% of the total generated energy, is a main component of electric power energy in China, and is coal-fired and bears the safe and stable ballast of an electric power system.
In addition, when the flue gas quantity is insufficient, the convection heat exchange of the boiler is reduced, the radiation heat exchange is mainly used, the superheat degree has to be increased to enable the main steam parameters to reach the rated value, but the problems of over-temperature of a water cooling wall, a partition screen and the like can be met. In general, the boiler can adopt a flue gas recirculation mode, change an air-air force field, a temperature field and the like in the boiler, realize the control of combustion, and further achieve the purposes of heat redistribution and steam temperature adjustment.
The flue gas recirculation generally extracts higher temperature flue gas before the air preheater, and then sends the recirculated flue gas into the furnace through the flue gas recirculation fan, which will increase the output of the air preheater, the dust remover and the induced draft fan, and meanwhile, the recirculated flue gas has a large dust content, which will cause abrasion problem for the recirculation fan and the accessory equipment thereof, and affect the availability of the system.
Therefore, how to effectively regulate the flow of the boiler flue gas and reduce the influence of the recycled flue gas on the existing system is a problem which needs to be solved by the technicians in the field at present.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, and provides a boiler flue gas flow regulating system based on flue gas recirculation, which can effectively regulate the boiler flue gas flow and reduce the influence of the recirculated flue gas on the system.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a boiler flue gas flow regulating system based on flue gas recirculation comprises a boiler body, an air preheater, a dust remover, a draught fan, a primary fan, a secondary fan and a chimney; the flue gas side inlet of the air preheater is connected with the flue gas outlet of the boiler body; the flue gas side outlet of the air preheater is connected with the inlet of the dust remover, and the outlet of the dust remover is connected with the inlet of the induced draft fan; the outlet of the induced draft fan is connected with a main path and a recirculation bypass which are arranged in parallel, the main path is connected with the chimney, and the recirculation bypass is connected with a first recirculation branch, a second recirculation branch and a third recirculation branch which are arranged in parallel; the air side inlets of the air preheater are provided with two inlets which are respectively connected with the outlet of the primary fan and the outlet of the secondary fan; the air side outlet of the air preheater is provided with two primary air inlets and two secondary air inlets which are respectively connected with the boiler body; the inlet of the primary air blower is divided into two paths, a first path of the inlet of the primary air blower is connected with the outside atmosphere, and a second path of the inlet of the primary air blower is connected with the first recirculation branch; the inlet of the secondary air blower is divided into two paths, a first path of the inlet of the secondary air blower is connected with the outside atmosphere, and a second path of the inlet of the secondary air blower is connected with the second recirculation branch; the third recycling branch is connected with a recycling flue gas inlet of the boiler body; a first valve is arranged at the outlet of the induced draft fan; a second valve is arranged at the inlet of the chimney; a third valve is arranged on the recirculation bypass; the first recycling branch connection is provided with a fourth valve, and the second recycling branch connection is provided with a fifth valve; and a sixth valve is arranged on the connection of the third recirculation branch.
As a preferable mode of the present utility model, the first valve, the second valve, the third valve, the fourth valve, the fifth valve and the sixth valve are all flow control valves.
As a preferable mode of the utility model, a seventh valve is arranged on the first way of the inlet of the primary air blower.
As a preferred embodiment of the present utility model, the seventh valve is a flow control valve.
As a preferable scheme of the utility model, an eighth valve is arranged on the first way of the inlet of the secondary air fan.
As a preferred embodiment of the present utility model, the eighth valve is a flow control valve.
Compared with the prior art, the boiler flue gas flow regulating system based on flue gas recirculation has the beneficial effects that:
according to the utility model, part of flue gas at the outlet of the induced draft fan is introduced into the primary fan and the secondary fan, and is mixed with air, and then the mixture is heated by the air preheater to form primary air and secondary air which are respectively sent into the boiler to participate in flue gas recirculation, so that the flue gas amount can be supplemented during deep peak regulation, the oxygen amount in the boiler can be reduced, the generation of nitrogen oxides can be reduced, the convection heat absorption can be enhanced, the temperature of working medium in a heating surface can be effectively improved, the inlet air temperature of the air preheater can be increased, the boiler efficiency can be improved, and the wall temperature of the vertical water-cooling wall and the screen type superheater can be regulated during low load.
In addition, the smoke recirculation is taken from the smoke passing through the air preheater and the dust remover, so that the dust content of the recirculated smoke can be reduced, the output of the air preheater, the dust remover and the induced draft fan is reduced, and the abrasion of the recirculated smoke to the circulating fan and auxiliary equipment thereof is effectively reduced.
Furthermore, the utility model can effectively regulate the flow of the boiler flue gas by arranging the valves, and has the advantages of flexibility, convenience and strong applicability.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present utility model, the drawings of the embodiments will be briefly described below.
Fig. 1 is a schematic structural diagram of a boiler flue gas flow regulating system based on flue gas recirculation according to an embodiment of the present utility model.
The marks in the figure:
1. a boiler body; 2. an air preheater; 3. a dust remover; 4. an induced draft fan; 5. a chimney; 6. a primary air blower; 7. a secondary air blower; 81. a first valve; 82. a second valve; 83. a third valve; 84. a fourth valve; 85. a fifth valve; 86. a sixth valve; 87. a seventh valve; 88. an eighth valve; 91. a main road; 92. a recirculation bypass; 101. a first recirculation leg; 102. a second recirculation branch; 103. and a third recirculation branch.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1 together, a boiler flue gas flow adjustment system based on flue gas recirculation according to an embodiment of the present utility model will now be described.
As shown in fig. 1, a preferred embodiment of the present utility model, a flue gas recirculation-based boiler flue gas flow rate regulation system, comprises a boiler body 1, an air preheater 2, a dust remover 3, an induced draft fan 4, a primary fan 6, a secondary fan 7 and a chimney 5; the flue gas side inlet of the air preheater 2 is connected with the flue gas outlet of the boiler body 1; the flue gas side outlet of the air preheater 2 is connected with the inlet of the dust remover 3, and the outlet of the dust remover 3 is connected with the inlet of the induced draft fan 4; the outlet of the induced draft fan 4 is connected with a main path 91 and a recirculation bypass 92 which are arranged in parallel, the main path 91 is connected with the chimney 5, and the recirculation bypass 92 is connected with a first recirculation branch 101, a second recirculation branch 102 and a third recirculation branch 103 which are arranged in parallel; the air side inlets of the air preheater 2 are provided with two inlets which are respectively connected with the outlet of the primary air blower 6 and the outlet of the secondary air blower 7; the air side outlet of the air preheater 2 is provided with two primary air inlets and two secondary air inlets which are respectively connected with the boiler body 1; the inlet of the primary air fan 6 is divided into two paths, a first path of the inlet of the primary air fan 6 is connected with the outside atmosphere, and a second path of the inlet of the primary air fan 6 is connected with the first recirculation branch 101; the inlet of the secondary air blower 7 is divided into two paths, a first path of the inlet of the secondary air blower 7 is connected with the outside atmosphere, and a second path of the inlet of the secondary air blower 7 is connected with the second recirculation branch 102; the third recirculation branch 103 is connected with a circulating flue gas inlet of the boiler body 1; a first valve 81 is arranged at the outlet of the induced draft fan 4; a second valve 82 is arranged at the inlet of the chimney 5; the recirculation bypass 92 is provided with a third valve 83; the first recirculation branch 101 is connected with a fourth valve 84, and the second recirculation branch 102 is connected with a fifth valve 85; the third recirculation branch 103 is connected with a sixth valve 86; a seventh valve 87 is arranged on the first way of the inlet of the primary air fan 6; an eighth valve 88 is arranged on the first way of the inlet of the secondary air fan 7. Further, the first valve 81, the second valve 82, the third valve 83, the fourth valve 84, the fifth valve 85, the sixth valve 86, the seventh valve 87, and the eighth valve 88 are all flow control valves.
In this embodiment, the air preheater 2 transfers heat from the flue gas of the boiler body 1 to primary air and secondary air, and the primary air and the secondary air after temperature rise are sent to the boiler body 1 by the primary air blower 6 and the secondary air blower 7, respectively, to assist combustion. During the operation of the system, the total smoke amount entering the recirculation bypass 92 can be controlled by adjusting the opening of the first valve 81, the second valve 82 and the third valve 83; the ratio of air to flue gas in the primary air fed into the boiler body 1 can be controlled by adjusting the opening of the fourth valve 84 and the seventh valve 87; the proportion of air and flue gas in the secondary air fed into the boiler body 1 can be controlled by adjusting the opening of the fifth valve 85 and the eighth valve 88; by adjusting the opening of the sixth valve 86, the amount of recirculated flue gas fed into the boiler body 1 can be controlled.
The boiler flue gas flow regulating system based on flue gas recirculation provided by the embodiment of the utility model has the following working processes: the hot flue gas generated by the combustion of the boiler body 1 flows to the dust remover 3 through the air preheater 2, most fly ash in the flue gas is captured by the dust remover 3, and the flue gas after dust removal is sent to the chimney 5 through the main path 91 by the induced draft fan 4 and is discharged to the atmosphere; when the flow of the flue gas in the furnace needs to be regulated, part of the flue gas at the outlet of the induced draft fan 4 is introduced into the recirculation bypass 92 to participate in the flue gas recirculation. The method specifically comprises the following steps:
the hot flue gas generated by the combustion of the boiler body 1 flows to the dust remover 3 through the air preheater 2, most fly ash in the flue gas is captured by the dust remover 3, and the first valve 81 and the second valve 82 are opened to ensure that the hot flue gas after dust removal is smoothly discharged to the atmosphere; at the same time, the seventh valve 87 and the eighth valve 88 are opened, and the air from the atmosphere is heated by the air preheater 2 and then fed into the boiler body 1.
When the flue gas flow needs to be regulated, the third valve 83 is opened, and the total flue gas amount of the recirculation bypass 92 is controlled by adjusting the valve opening of the first valve 81, the second valve 82 and the third valve 83; at the same time, the fourth valve 84, the fifth valve 85 and the sixth valve 86 are opened. For primary air, the ratio of air to flue gas in the primary air fed into the boiler body 1 is controlled by adjusting the opening of the fourth valve 84 and the seventh valve 87; for the secondary air, the proportion of air and flue gas in the secondary air fed into the boiler body 1 is controlled by adjusting the opening of the fifth valve 85 and the eighth valve 88. The primary air and the secondary air are respectively mixed with the recirculated flue gas and then are heated by an air preheater 2 and sent into a boiler. When the amount of recirculated flue gas changes rapidly, the amount of recirculated flue gas fed into the boiler body 1 is controlled by adjusting the opening of the sixth valve 86.
When there is no need to adjust the flow rate of the flue gas, the first valve 81, the second valve 82, the seventh valve 87 and the eighth valve 88 are kept open, while the third valve 83, the fourth valve 84, the fifth valve 85 and the sixth valve 86 are closed.
In summary, the technical key of implementing the boiler flue gas flow regulating system based on flue gas recirculation provided by the embodiment of the utility model is that:
according to the embodiment of the utility model, part of flue gas at the outlet of the induced draft fan 4 is introduced into the primary air blower 6 and the secondary air blower 7, and is mixed with air, and then the mixture is heated by the air preheater 2 to form primary air and secondary air, and the primary air and the secondary air are respectively sent into the boiler to participate in flue gas recirculation, so that the flue gas quantity can be supplemented during deep peak regulation, the oxygen quantity in the boiler can be reduced, the generation of nitrogen oxides can be reduced, the convection heat absorption can be enhanced, the temperature of working medium in a heating surface can be effectively improved, the inlet air temperature of the air preheater 2 can be increased, the boiler efficiency can be improved, and the wall temperature of the vertical water-cooling wall and the screen type superheater can be regulated during low load.
In addition, the flue gas recirculation of the embodiment of the utility model is obtained from the flue gas passing through the air preheater 2 and the dust remover 3, so that the dust content of the recirculated flue gas can be reduced, the output of the air preheater 2, the dust remover 3 and the induced draft fan 4 is reduced, and the abrasion of the recirculated flue gas to the circulating fan and auxiliary equipment thereof is effectively reduced.
In addition, the embodiment of the utility model can effectively regulate the flow of the boiler flue gas through the arrangement of each valve, and is flexible, convenient and high in applicability.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.
Claims (6)
1. The boiler flue gas flow regulating system based on flue gas recirculation is characterized by comprising a boiler body, an air preheater, a dust remover, an induced draft fan, a primary fan, a secondary fan and a chimney;
the flue gas side inlet of the air preheater is connected with the flue gas outlet of the boiler body; the flue gas side outlet of the air preheater is connected with the inlet of the dust remover, and the outlet of the dust remover is connected with the inlet of the induced draft fan; the outlet of the induced draft fan is connected with a main path and a recirculation bypass which are arranged in parallel, the main path is connected with the chimney, and the recirculation bypass is connected with a first recirculation branch, a second recirculation branch and a third recirculation branch which are arranged in parallel;
the air side inlets of the air preheater are provided with two inlets which are respectively connected with the outlet of the primary fan and the outlet of the secondary fan; the air side outlet of the air preheater is provided with two primary air inlets and two secondary air inlets which are respectively connected with the boiler body; the inlet of the primary air blower is divided into two paths, a first path of the inlet of the primary air blower is connected with the outside atmosphere, and a second path of the inlet of the primary air blower is connected with the first recirculation branch; the inlet of the secondary air blower is divided into two paths, a first path of the inlet of the secondary air blower is connected with the outside atmosphere, and a second path of the inlet of the secondary air blower is connected with the second recirculation branch; the third recycling branch is connected with a recycling flue gas inlet of the boiler body;
a first valve is arranged at the outlet of the induced draft fan; a second valve is arranged at the inlet of the chimney; a third valve is arranged on the recirculation bypass; the first recycling branch connection is provided with a fourth valve, and the second recycling branch connection is provided with a fifth valve; and a sixth valve is arranged on the connection of the third recirculation branch.
2. The flue gas recirculation-based boiler flue gas flow regulation system of claim 1, wherein the first valve, the second valve, the third valve, the fourth valve, the fifth valve, and the sixth valve are flow control valves.
3. The flue gas recirculation-based boiler flue gas flow adjustment system according to claim 1, wherein a seventh valve is provided on the primary air fan inlet first pass.
4. A flue gas recirculation-based boiler flue gas flow conditioning system according to claim 3, wherein the seventh valve is a flow control valve.
5. The flue gas recirculation-based boiler flue gas flow adjustment system according to claim 1, wherein an eighth valve is provided on the inlet first way of the secondary fan.
6. The flue gas recirculation-based boiler flue gas flow adjustment system according to claim 5, wherein the eighth valve is a flow control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322298255.8U CN220601505U (en) | 2023-08-25 | 2023-08-25 | Boiler flue gas flow regulating system based on flue gas recirculation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322298255.8U CN220601505U (en) | 2023-08-25 | 2023-08-25 | Boiler flue gas flow regulating system based on flue gas recirculation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220601505U true CN220601505U (en) | 2024-03-15 |
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ID=90166655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322298255.8U Active CN220601505U (en) | 2023-08-25 | 2023-08-25 | Boiler flue gas flow regulating system based on flue gas recirculation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220601505U (en) |
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2023
- 2023-08-25 CN CN202322298255.8U patent/CN220601505U/en active Active
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