CN216557190U - Boiler flue gas waste heat recovery and air heating humidification device - Google Patents
Boiler flue gas waste heat recovery and air heating humidification device Download PDFInfo
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- CN216557190U CN216557190U CN202120767078.1U CN202120767078U CN216557190U CN 216557190 U CN216557190 U CN 216557190U CN 202120767078 U CN202120767078 U CN 202120767078U CN 216557190 U CN216557190 U CN 216557190U
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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 relates to the technical field of boiler energy recycling, in particular to a device for recovering waste heat of boiler flue gas and heating and humidifying air, which comprises a flue gas waste heat recovery tower and a water-water heat exchanger; the flue gas waste heat recovery tower is connected with a boiler smoke exhaust port; the water outlet of the flue gas waste heat recovery tower is connected with the primary side water inlet of the water-water heat exchanger; the system also comprises a warm air humidifier, an air superheater and a boiler air preheater, wherein a gas outlet of the warm air humidifier is sequentially connected with the air superheater and the boiler air preheater; a primary side water outlet of the water-water heat exchanger is divided into two branches, one branch is connected with a water inlet of the warm air humidifier, and a water outlet of the warm air humidifier is connected with the flue gas waste heat recovery tower; the other branch is directly connected with the flue gas waste heat recovery tower. The recycling of the condensed water of the flue gas is realized, the waste heat recovery of the flue gas and the heating and humidifying of the air are realized, and the aim of partially eliminating the white smoke of the flue gas is fulfilled.
Description
Technical Field
The utility model relates to the technical field of boiler energy recycling, in particular to a device for recovering waste heat of boiler flue gas and heating and humidifying air.
Background
The information in this background section is only for enhancement of understanding of the general background of the utility model and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
Most thermal generator sets are provided with flue gas desulfurization devices, so that tail flue gas at the outlet of the boiler reaches the standard and is discharged. Most of the desulfurization processes employ wet desulfurization in a desulfurization tower in view of desulfurization efficiency and investment cost. Because the flue gas directly contacts with the desulfurizer slurry, the temperature of the flue gas at the outlet of the desulfurizing tower is about 50 ℃. The flue gas has low temperature and low heat taste, and is difficult to recycle. Most of the waste heat directly enters the atmosphere along with the emission of the flue gas and is not recycled. With the continuous deepening of energy conservation and emission reduction, how to effectively utilize the waste heat is more and more emphasized.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems in the prior art, the utility model aims to provide a device for recovering waste heat of boiler flue gas and heating and humidifying air.
The desulfurization mode conventionally comprises dry desulfurization and wet desulfurization. The wet desulphurization method has higher desulphurization efficiency than the dry desulphurization method, so that the wet desulphurization method is widely used by power plants. After being washed by the wet desulfurizer, the temperature of the flue gas at the outlet of the desulfurizing tower is about 50 ℃, and the device for recovering the flue gas waste heat of the boiler and heating and humidifying the air is provided in order to effectively utilize the flue gas waste heat after the desulfurizing tower, reduce the temperature of the discharged flue gas, increase the temperature of the return water of the circulating water and improve the whole-field thermal efficiency.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
a device for recovering waste heat of boiler flue gas and heating and humidifying air comprises: the system comprises a flue gas waste heat and moisture recovery device and a boiler air inlet humidifying and heating device, wherein the flue gas waste heat and moisture recovery device is used for recovering waste heat and moisture in flue gas; the recycled flue gas condensed water enters the boiler air inlet humidifying and heating equipment to heat and humidify the boiler air inlet, and the condensed water is sent back to the flue gas waste heat and moisture recovery equipment to recover the waste heat and the moisture of the flue gas, so that the recycling of the flue gas condensed water, the waste heat recovery of the flue gas and the air heating and humidifying are realized.
Specifically, the flue gas waste heat and moisture recovery equipment comprises a flue gas waste heat recovery tower and a water-water heat exchanger;
the flue gas waste heat recovery tower is connected with a boiler smoke exhaust port; the water outlet of the flue gas waste heat recovery tower is connected with the primary side water inlet of the water-water heat exchanger;
the flue gas waste heat recovery tower is a key device for heat recovery, a spray tower is arranged in the flue gas waste heat recovery tower, high-temperature flue gas from a boiler exhaust port enters from the lower part of the flue gas waste heat recovery tower and is in countercurrent contact with spray cooling water for heat exchange, so that the high-temperature flue gas is cooled to release heat, part of vapor in the flue gas is condensed to release latent heat of vaporization, and the spray cooling water is heated by the two parts of heat; and discharging the flue gas subjected to spraying and cooling from the top of the flue gas waste heat recovery tower.
Further, in order to reasonably utilize the temperature gradient of the flue gas, a spray tower in the flue gas waste heat recovery tower is provided with a high-temperature spray section and a low-temperature spray section; the high-temperature spraying section is arranged at the lower part of the spraying tower, and the low-temperature spraying section is arranged at the upper part of the spraying tower.
Spraying cooling water in the flue gas waste heat recovery tower to be heated into flue gas high-temperature condensed water, discharging the flue gas high-temperature condensed water from the flue gas waste heat recovery tower, then feeding the flue gas high-temperature condensed water into a water-water heat exchanger to heat a low-temperature medium in the water-water heat exchanger, discharging the heated medium from a secondary side outlet of the water-water heat exchanger, thereby recovering waste heat in the flue gas high-temperature condensed water, and changing the flue gas high-temperature condensed water into flue gas medium-temperature condensed water which is discharged from a primary side water outlet of the water-water heat exchanger;
the boiler inlet air humidifying and heating equipment comprises a warm air humidifier, an air superheater and a boiler air preheater, wherein a gas outlet of the warm air humidifier is sequentially connected with the air superheater and the boiler air preheater;
furthermore, a primary side water outlet of the water-water heat exchanger is divided into two branches, one branch is connected with a water inlet of the warm air humidifier, the flue gas medium-temperature condensed water discharged by the water-water heat exchanger heats and humidifies the introduced outdoor cold air in the warm air humidifier, and the flue gas medium-temperature condensed water is changed into flue gas low-temperature condensed water; the water outlet of the warm air humidifier is connected with the flue gas waste heat recovery tower, and the flue gas low-temperature condensed water is sent back to the flue gas waste heat recovery tower to be used as a low-temperature spraying medium;
the other branch of the primary side water outlet of the water-water heat exchanger is connected with the flue gas waste heat recovery tower and is directly sent into the high-temperature spraying section of the flue gas waste heat recovery tower to be recycled as a high-temperature spraying medium.
The warm air humidifier, the air superheater and the boiler air preheater are used for feeding the humidified and heated air into the boiler to be combusted with fuel; therefore, the recycling of the condensed water of the flue gas is realized, and the waste heat recovery of the flue gas and the heating and humidifying of the air are realized at the same time.
Preferably, a condensate circulating pump is arranged between the water outlet of the warm air humidifier and the waste heat recovery tower;
preferably, a condensate circulating pump is arranged between the flue gas waste heat recovery tower and the water-water heat exchanger;
preferably, a blower is arranged between the air superheater and the boiler air preheater, and pressurizes air from the air superheater;
preferably, a dust remover and a desulfurizing tower are sequentially arranged between the boiler smoke outlet and the flue gas waste heat recovery tower, and smoke dust and SO2 are sequentially removed, SO that the flue gas reaches the emission standard;
preferably, an induced draft fan is arranged between the dust remover and the desulfurizing tower;
preferably, the smoke outlet of the smoke waste heat recovery tower is connected with the chimney, and as the smoke passes through the smoke waste heat recovery tower, the temperature of the smoke is reduced, and the saturated partial pressure of the water vapor in the smoke is also reduced, so that the water vapor content of the smoke entering the chimney is reduced, and the aim of eliminating the white smoke is fulfilled.
The warm air humidifier is a key device for improving the quality of the tail flue gas at the outlet of the boiler, and can improve the heat quality of the tail flue gas at the outlet of the boiler due to the humidification of the air before entering the boiler. The air superheater is a device for heating wet saturated air to an overheated state, the wet saturated air coming out of the warm air humidifier dissipates heat in the conveying process, condensed water can be separated out due to temperature reduction, the air with the condensed water enters the air feeder and can seriously affect the safe operation of the air feeder, so that the air needs to be properly overheated through the air superheater, the air is overheated, steam can be used as a heating heat source, and the air superheater utilizes a high-temperature medium to heat the air A and the high-temperature medium to return the air B.
In order to obtain as much residual heat from the flue gas as possible, there are various ways, the most convenient and simple of which is to increase the moisture content of the air entering the boiler in order to obtain more latent heat of vaporization in the low temperature section of the flue gas. The latent heat of vaporization of water is large, the water is cheap and convenient to obtain, and saturated water in air is changed into superheated steam before entering a boiler and is used as an inert medium, so that the superheated steam does not have great negative influence on combustion of the boiler and various heating surfaces after entering the boiler.
The utility model has the beneficial effects that:
by using the device, the temperature of the flue gas at the outlet of the desulfurizing tower is reduced to about 20 ℃ from about 50 ℃ by adopting low-temperature spray water, the low-temperature spray water is heated into high-temperature spray water by the flue gas which releases heat in a countercurrent manner, and then the spray water and a heat supply network are subjected to water heat exchange by adopting a water-water heat exchanger, so that the aim of transferring the heat of the low-temperature flue gas at the outlet of the desulfurizing tower to the heat supply network water and recycling the heat is fulfilled finally. On the other hand, because of the reduction of the temperature of the flue gas at the outlet of the desulfurizing tower, water vapor in the flue gas can be condensed out, and the aim of partial white elimination of the flue gas is fulfilled.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.
FIG. 1 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;
in the figure, 1, a boiler air preheater, 2, a blower, 3, a desulfurizing tower, 4, a flue gas waste heat recovery tower, 5, a water-water heat exchanger, 6, a warm air humidifier, 7, an air superheater, 8, No. 1 condensate circulating pumps, 9, No. 2 condensate circulating pumps, 10, a chimney, 11, a dust remover, 12 and an induced draft fan; A. high temperature medium; B. high-temperature medium return, cold air outside C, low-temperature heat supply network return water coming D and high-temperature heat supply network return water coming E.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the utility model as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Interpretation of terms: primary side of the heat exchanger: the heat exchanger is a high-temperature heat release working medium side, and high temperature flows into the heat exchanger from an inlet and then flows out of the heat exchanger from an outlet after being released; secondary side of the heat exchanger: the heat exchanger is arranged at the low-temperature heat absorption working medium side, and low temperature flows into the heat exchanger from an inlet to absorb heat and then flows out of the heat exchanger from an outlet.
As shown in fig. 1, an apparatus for recovering waste heat of flue gas of a boiler and heating and humidifying air comprises: the system comprises a dust remover 11, an induced draft fan 12, a desulfurizing tower 3, a flue gas waste heat recovery tower 4 and a chimney 10;
high-temperature flue gas discharged from a boiler is subjected to smoke dust removal through a dust remover 11, and clean flue gas is sent to a draught fan 12 to be pressurized and then enters a desulfurizing tower 3 to remove SO2Removal of SO2The high-temperature flue gas enters a flue gas waste heat recovery tower 4, a spray tower is arranged in the flue gas waste heat recovery tower 4, the spray tower is provided with a high-temperature spray section and a low-temperature spray section, the high-temperature spray section is arranged at the lower part of the spray tower, and the low-temperature spray section is arranged at the upper part of the spray tower, so that the temperature gradient of the flue gas can be reasonably utilized; high-temperature flue gas enters from the lower part of the flue gas waste heat recovery tower 4 and is in countercurrent contact with spray cooling water for heat exchange, so that the high-temperature flue gas is cooled to release heat, part of water vapor in the flue gas is condensed to release latent heat of vaporization, and the spray cooling water is heated by the two parts of heat, so that the spray cooling water becomes flue gas high-temperature condensed water; the flue gas after being sprayed and cooled is discharged from the top of the flue gas waste heat recovery tower 4, enters a chimney 10 and is discharged into the air; as the flue gas passes through the flue gas waste heat recovery tower 4, the temperature of the flue gas is reduced, and the saturated partial pressure of the water vapor in the flue gas is also reduced, so that the water vapor content of the flue gas entering the chimney is reduced, and the aim of eliminating the white smoke of the flue gas is fulfilled.
As shown in fig. 1, the device for recovering waste heat of boiler flue gas and heating and humidifying air further comprises a water-water heat exchanger 5, a warm air humidifier 6, an air superheater 7, a blower 2 and a boiler air preheater 1;
the flue gas high-temperature condensed water in the flue gas waste heat recovery tower 4 is discharged into a water-water heat exchanger 5, a low-temperature medium in the water-water heat exchanger 5 is heated, the heated medium is discharged from a secondary side outlet of the water-water heat exchanger, so that the waste heat in the flue gas high-temperature condensed water is recovered, the flue gas high-temperature condensed water is changed into flue gas medium-temperature condensed water, and the flue gas medium-temperature condensed water is discharged from a primary side water outlet of the water-water heat exchanger 5;
the flue gas medium-temperature condensed water discharged from a primary side water outlet of the water-water heat exchanger 5 is divided into two branches, wherein one branch is connected with a water inlet of the warm air humidifier 6, the flue gas medium-temperature condensed water heats and humidifies outdoor cold air introduced into the warm air humidifier 6, and the flue gas medium-temperature condensed water is changed into flue gas low-temperature condensed water; the water outlet of the warm air humidifier 6 is connected with the flue gas waste heat recovery tower 4, and the flue gas low-temperature condensed water is sent back to the flue gas waste heat recovery tower 4 to be used as a low-temperature spraying medium;
the other branch is connected with the flue gas waste heat recovery tower 4 and is directly sent into the high-temperature spraying section of the flue gas waste heat recovery tower 4 to be used as a high-temperature spraying medium for recycling.
The gas outlet of the warm air humidifier 6 is connected with the air superheater 7, the blower 2 and the boiler air preheater 1 in sequence, and the warm air humidifier 6, the air superheater 7 and the boiler air preheater 1 send the humidified and heated air into the boiler to be combusted with fuel; therefore, the recycling of the condensed water of the flue gas is realized, and the waste heat recovery of the flue gas and the heating and humidifying of the air are realized at the same time.
Preferably, a condensate circulating pump 9 is arranged between the water outlet of the warm air humidifier 6 and the flue gas waste heat recovery tower 4;
preferably, a condensate circulating pump 8 is arranged between the flue gas waste heat recovery tower 4 and the water-water heat exchanger 5;
the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. The utility model provides a device of boiler flue gas waste heat recovery and air heating humidification which characterized in that includes: the system comprises a flue gas waste heat and moisture recovery device and a boiler air inlet humidifying and heating device, wherein the flue gas waste heat and moisture recovery device is used for recovering waste heat and moisture in flue gas; the recycled flue gas condensed water enters the boiler air inlet humidifying and heating equipment to heat and humidify the boiler air inlet, and the condensed water is sent back to the flue gas waste heat and moisture recovery equipment to recover the waste heat and the moisture of the flue gas, so that the recycling of the flue gas condensed water, the waste heat recovery of the flue gas and the air heating and humidifying are realized.
2. The apparatus for recovering waste heat of flue gas from boiler and heating and humidifying air as claimed in claim 1, wherein the flue gas waste heat and moisture recovering device comprises a flue gas waste heat recovering tower and a water-water heat exchanger; the flue gas waste heat recovery tower is connected with a boiler smoke exhaust port; the water outlet of the flue gas waste heat recovery tower is connected with the primary side water inlet of the water-water heat exchanger;
the boiler inlet air humidifying and heating equipment comprises a warm air humidifier, an air superheater and a boiler air preheater, wherein a gas outlet of the warm air humidifier is sequentially connected with the air superheater and the boiler air preheater;
a primary side water outlet of the water-water heat exchanger is divided into two branches, one branch is connected with a water inlet of the warm air humidifier, and a water outlet of the warm air humidifier is connected with the flue gas waste heat recovery tower; the other branch is directly connected with the flue gas waste heat recovery tower.
3. The apparatus for recovering waste heat of boiler flue gas and heating and humidifying air as claimed in claim 2, wherein a spray tower is disposed in the flue gas waste heat recovery tower.
4. The apparatus for recovering waste heat of boiler flue gas and heating and humidifying air as claimed in claim 3, wherein the spray tower is provided with a high temperature spray section and a low temperature spray section.
5. The apparatus for recovering waste heat of boiler flue gas and heating and humidifying air as claimed in claim 4, wherein the high temperature spray stage is disposed at the lower part of the spray tower, and the low temperature spray stage is disposed at the upper part of the spray tower.
6. The device for recovering the waste heat of the boiler flue gas and heating and humidifying the air as claimed in claim 2, wherein a water outlet of the warm air humidifier is connected with a low-temperature spraying section in the flue gas waste heat recovery tower;
the other branch of the primary side water outlet of the water-water heat exchanger is connected with a high-temperature spray section in the flue gas waste heat recovery tower.
7. The apparatus for recovering waste heat of boiler flue gas and heating and humidifying air as claimed in claim 2, wherein a condensate circulating pump is arranged between the water outlet of the warm air humidifier and the waste heat recovery tower.
8. The apparatus for recovering waste heat of boiler flue gas and heating and humidifying air as claimed in claim 2, wherein a condensate circulating pump is arranged between the flue gas waste heat recovery tower and the water-water heat exchanger.
9. The apparatus for recovering waste heat of boiler flue gas and heating and humidifying air as claimed in claim 2, wherein a blower is provided between the air superheater and the boiler air preheater.
10. The apparatus for recovering waste heat of boiler flue gas and heating and humidifying air as claimed in claim 2, wherein a dust remover and a desulfurizing tower are sequentially arranged between the boiler smoke outlet and the flue gas waste heat recovery tower.
11. The apparatus for recovering waste heat of boiler flue gas and heating and humidifying air as claimed in claim 10, wherein an induced draft fan is arranged between the dust remover and the desulfurizing tower.
12. The apparatus for recovering waste heat of boiler flue gas and heating and humidifying air as claimed in claim 2, wherein the smoke outlet of the flue gas waste heat recovery tower is connected with a chimney.
13. The apparatus for recovering waste heat of boiler flue gas and heating and humidifying air as claimed in claim 2, wherein the air superheater uses steam as a heating heat source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120767078.1U CN216557190U (en) | 2021-04-14 | 2021-04-14 | Boiler flue gas waste heat recovery and air heating humidification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120767078.1U CN216557190U (en) | 2021-04-14 | 2021-04-14 | Boiler flue gas waste heat recovery and air heating humidification device |
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| Publication Number | Publication Date |
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| CN216557190U true CN216557190U (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120767078.1U Active CN216557190U (en) | 2021-04-14 | 2021-04-14 | Boiler flue gas waste heat recovery and air heating humidification device |
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| CN (1) | CN216557190U (en) |
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2021
- 2021-04-14 CN CN202120767078.1U patent/CN216557190U/en active Active
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