CN211651283U - Device for realizing deep recovery of boiler flue gas waste heat and air humidification - Google Patents
Device for realizing deep recovery of boiler flue gas waste heat and air humidification Download PDFInfo
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- CN211651283U CN211651283U CN202020223257.4U CN202020223257U CN211651283U CN 211651283 U CN211651283 U CN 211651283U CN 202020223257 U CN202020223257 U CN 202020223257U CN 211651283 U CN211651283 U CN 211651283U
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Abstract
The utility model provides a realize the device of boiler flue gas waste heat degree of depth recovery and air humidification, drop the boiler exhaust gas temperature below the water dew point, improved energy efficiency, saved the natural gas consumption, the waste heat of retrieving can also be regarded as the heat source of outside heat user, has apparent economic benefits; the oxygen concentration of combustion air entering the boiler is reduced through air humidification and flue gas recirculation, the combustion temperature is reduced, and the aim of reducing the NOx emission concentration is fulfilled. In addition, the flue gas recirculation can provide more heat for the combustion air humidification process, and the air humidification quantity is improved; as the temperature of the boiler exhaust smoke is reduced to be below the water dew point, most of water vapor in the smoke is condensed, the aim of recovering the water vapor in the smoke can be achieved, the water consumption is reduced, and the visual pollution of white smoke plume is relieved.
Description
Technical Field
The utility model belongs to thermal power energy saving and emission reduction field, concretely relates to realize device of boiler flue gas waste heat degree of depth recovery and air humidifying.
Background
The natural gas flue gas contains a large amount of water vapor, the proportion of latent heat of vaporization of the water vapor to low-order heating value of the natural gas reaches 10% -11%, and the flue gas latent heat of the natural gas is basically not utilized and is directly discharged into the environment at present. In addition, the water vapor in the smoke is directly discharged into the atmosphere, which not only causes water loss, but also forms a white smoke plume phenomenon to cause landscape pollution. The deep recycling of the flue gas waste heat including the latent heat of condensation of water vapor is of great significance to energy conservation and pollutant discharge reduction. The deep utilization technology of the flue gas waste heat is characterized in that a condensing heat exchanger is additionally arranged on a tail flue, the flue gas efficiently exchanges heat with intermediate water in the heat exchanger, the flue gas is rapidly cooled and condensed, and after most of water vapor is removed, the flue gas is sent into a chimney. The medium water exchanging heat with the flue gas is heated and then enters the absorption heat pump to release heat, so that the low-temperature waste heat of the flue gas can be recovered and transferred to heat users such as urban heat supply networks.
The NOx generation concentration of natural gas in the combustion process of a boiler is mainly influenced by temperature, and the thermal NOx emission increases exponentially with the temperature. After steam or water is injected into the combustion air of the boiler, the generation of thermal NOx in the combustion process can be reduced. In addition, NOx generated by natural gas in the combustion process of the boiler can be reduced by adopting a flue gas recirculation technology, wherein the flue gas recirculation technology is to extract part of cooled flue gas, mix the extracted flue gas with combustion-supporting air entering the boiler and send the mixed flue gas into a combustion system, and the flue gas recirculation technology can play a role in reducing the oxygen concentration and the temperature of a combustion area so as to achieve the purpose of reducing the generation amount of thermal NOx.
However, the conventional flue gas recirculation technology has a drawback that the effect of reducing the amount of thermal NOx generation is not satisfactory.
Disclosure of Invention
An object of the utility model is to provide a realize boiler flue gas waste heat degree of depth recovery and air humidifying's device, solved the not enough that exists among the prior art.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
the utility model provides a device for realizing deep recovery of boiler flue gas waste heat and air humidification, which comprises a boiler and a waste heat recovery tower, wherein the boiler is provided with a natural gas inlet, and a flue gas outlet on the boiler is respectively connected with an upper tower and a lower tower of the waste heat recovery tower;
a smoke outlet is formed in the upper tower of the waste heat recovery tower;
and a high-temperature humidifying flue gas outlet is arranged on the lower tower of the waste heat recovery tower and is connected with an inlet of a boiler.
Preferably, a first induced draft fan is arranged between the outlet of the boiler and the upper tower of the waste heat recovery tower.
Preferably, a second induced draft fan is arranged between the outlet of the boiler and the lower tower of the waste heat recovery tower.
Preferably, an upper tower demister, an upper tower liquid distribution layer, an upper tower packing layer and an upper tower liquid storage layer are sequentially arranged in an upper tower inner cavity of the waste heat recovery tower from top to bottom, wherein a smoke outlet on an upper tower of the waste heat recovery tower is arranged above the upper tower demister; an intermediate water inlet is formed in the upper tower liquid distribution layer; and the upper tower liquid storage layer is provided with an intermediate water outlet, and the intermediate water outlet is connected with the intermediate water inlet through a heat pump.
Preferably, a flue gas inlet on the upper tower of the waste heat recovery tower is arranged between the liquid storage layer of the upper tower and the packing layer of the upper tower.
Preferably, the upper tower of the waste heat recovery tower is further provided with a first overflow port, and the first overflow port is arranged above the liquid storage layer of the upper tower; and an intermediate water outlet is formed in the bottom of the upper tower liquid storage layer and is communicated with the lower tower of the waste heat recovery tower.
Preferably, a first valve and a first water pump are sequentially arranged between the intermediate water outlet on the upper tower liquid storage layer and the heat pump.
Preferably, a lower tower liquid distribution layer, a lower tower filler layer and a lower tower liquid storage layer are sequentially arranged in an inner cavity of a lower tower of the waste heat recovery tower from top to bottom; the high-temperature humidifying flue gas outlet on the lower tower of the waste heat recovery tower is arranged above the liquid distribution layer of the lower tower; the lower tower liquid distribution layer is provided with an intermediate water inlet which is communicated with the upper tower of the waste heat recovery tower; the lower tower liquid storage layer is provided with an intermediate water outlet which is communicated with the upper tower of the waste heat recovery tower; and a flue gas inlet and an air inlet on the lower tower of the waste heat recovery tower are uniformly arranged between a liquid storage layer of the lower tower and a packing layer of the lower tower.
Preferably, a second overflow port is further arranged on the lower tower of the waste heat recovery tower, and the second overflow port is arranged above the liquid storage layer of the lower tower.
Preferably, a second valve and a second water pump are sequentially arranged between an intermediate water outlet arranged on the lower tower liquid storage layer and an upper tower of the waste heat recovery tower.
Compared with the prior art, the beneficial effects of the utility model are that:
according to the device for realizing deep recovery of the waste heat of the boiler flue gas and air humidification, the oxygen concentration of combustion air entering the boiler is reduced in an air humidification and flue gas recirculation mode, the combustion temperature is reduced, and the aim of reducing the emission concentration of NOx is fulfilled; in addition, the flue gas recirculation can provide more heat for the combustion air humidification process, and the air humidification quantity is improved; the boiler exhaust gas temperature is reduced to be below the water dew point, so that most of water vapor in the flue gas is condensed, the purpose of recovering the water vapor in the flue gas can be achieved, the water consumption is reduced, the visual pollution of white smoke plume is relieved, meanwhile, the energy utilization efficiency is improved, the natural gas consumption is saved, the recovered waste heat can also be used as a heat source of an external heat user, and the boiler exhaust gas heat recovery device has remarkable economic benefit.
In conclusion, the flue gas waste heat deep recovery process, the air humidification process, the flue gas recirculation process and the smoke exhaust process are integrated in one device, the device is compact in structure and easy to process, the gravity liquid distribution is realized by fully utilizing the height difference of the intermediate water, and the device is low in energy consumption.
Drawings
Fig. 1 is a schematic view of the structure of the device according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a pair of realize device of boiler flue gas waste heat degree of depth recovery and air humidifying, including boiler 1, heat pump 2, waste heat recovery tower 3, go up tower packing layer 4, go up tower cloth liquid layer 5, go up tower defroster 6, chimney 7, first valve 8, first water pump 9, first overflow mouth 10, go up tower deposit liquid pond 11, lower tower packing layer 12, lower tower cloth liquid layer 13, second valve 14, second water pump 15, second overflow mouth 16, lower tower deposit liquid pond 17, wind channel defroster 18, first draught fan 19, second draught fan 20, forced draught blower 21 and air door 22, wherein, be provided with the natural gas entry on the boiler 1, the exhanst gas outlet of boiler 1 is connected with first draught fan 19 and second draught fan 20 respectively.
The outlet of the first draught fan 19 is connected with the upper tower of the waste heat recovery tower 3, the top of the upper tower of the waste heat recovery tower 3 is provided with a smoke outlet, and the smoke outlet is communicated with the chimney 7.
The upper tower of the waste heat recovery tower 3 is provided with an intermediate water outlet, the intermediate water outlet is connected with the heat pump 2 through a first valve 8 and a first water pump 9 in sequence, and the intermediate water outlet of the heat pump 2 is connected with an intermediate water inlet arranged on the upper tower of the waste heat recovery tower 3.
And the outlet of the second induced draft fan 20 is connected with the lower tower of the waste heat recovery tower through an air door 22.
An air inlet is formed in the lower tower of the waste heat recovery tower 3; and a high-temperature humidifying flue gas outlet arranged on the lower tower of the waste heat recovery tower 3 is connected with an inlet of the boiler 1 through an air duct demister 18.
An intermediate water outlet is arranged on the lower tower of the waste heat recovery tower 3 and is connected with an intermediate water inlet on the upper tower of the waste heat recovery tower 3 through a second valve 14 and a second water pump 15 in sequence.
An intermediate water inlet is arranged on the lower tower of the waste heat recovery tower and is connected with the upper tower of the waste heat recovery tower 3.
An upper tower demister 6, an upper tower liquid distribution layer 5, an upper tower packing layer and an upper tower liquid storage layer 11 are sequentially arranged in an upper tower inner cavity of the waste heat recovery tower from top to bottom.
And a smoke outlet on the upper tower of the waste heat recovery tower 3 is arranged above the upper tower demister 6.
An intermediate water inlet on the upper tower of the waste heat recovery tower 3 is arranged on the upper tower liquid distribution layer 5.
The intermediate water outlet on the upper tower of the waste heat recovery tower 3 is arranged on the upper tower liquid storage layer 11.
And a flue gas inlet on the upper tower of the waste heat recovery tower 3 is arranged between the upper tower liquid storage layer 11 and the upper tower packing layer 4.
The upper tower of the waste heat recovery tower 3 is further provided with a first overflow port 10, and the first overflow port 10 is arranged above the upper tower liquid storage layer 11.
And an intermediate water outlet is formed in the bottom of the upper tower liquid storage layer 11 and is communicated with the lower tower of the waste heat recovery tower 3.
And a lower tower liquid distribution layer 13, a lower tower filler layer 12 and a lower tower liquid storage layer 17 are sequentially arranged in the inner cavity of the lower tower of the waste heat recovery tower 3 from top to bottom.
And a high-temperature humidifying flue gas outlet on the lower tower of the waste heat recovery tower 3 is arranged above a liquid distribution layer of the lower tower.
The intermediate water inlet on the lower tower of the waste heat recovery tower 3 is arranged on the lower tower liquid distribution layer 13; and an intermediate water outlet at the bottom of the upper tower liquid storage layer 11 is communicated with the lower tower liquid distribution layer 13.
The intermediate water outlet on the lower tower of the waste heat recovery tower 3 is arranged on the lower tower liquid storage layer 17.
And a flue gas inlet and an air inlet on the lower tower of the waste heat recovery tower 3 are both arranged between the lower tower liquid storage layer 17 and the lower tower packing layer 12.
A second overflow port 16 is further arranged on the lower tower of the waste heat recovery tower 3, and the second overflow port 16 is arranged above the lower tower liquid storage layer 17.
The working process of the system is as follows:
the natural gas is after heat release with the burning of humidification air in boiler 1, and the boiler flue gas that forms is divided into two the tunnel, and first way is sent into waste heat recovery tower 3 by first draught fan 19 and is gone up the tower, passes through in proper order after last tower packing layer 4, last tower cloth liquid layer 5, last tower defroster 6, carries out direct contact heat and mass transfer process with the middle water of low temperature of last tower cloth liquid layer 5 spun, and the chimney 7 of arranging in waste heat recovery equipment top is sent into to the boiler flue gas cooling after dehumidifying, discharges into the atmosphere.
The low-temperature intermediate water is sprayed to the upper tower packing layer 4 from the upper tower liquid distribution layer 5, and is subjected to a direct contact type heat and mass transfer process with the boiler flue gas, and the intermediate water falls into the upper tower liquid storage tank 11 after being heated.
The intermediate water is led out from the upper tower liquid storage tank 11, passes through the first valve 8 and the first water pump 9, and is sent to the heat pump 2, and the intermediate water is sent to the upper tower liquid distribution layer 5 after being cooled by the heat pump 2.
A first overflow port 10 is arranged above the upper tower liquid storage tank 11.
The second path of the boiler flue gas passes through a second induced draft fan 20 and an air door 22 and is sent to a lower tower of the waste heat recovery tower 3; the combustion air of the boiler 1 is sent to the lower tower of the waste heat recovery tower 3 through a blower 21; combustion air and part of boiler flue gas pass through a lower tower packing layer 12 and a lower tower liquid distribution layer 13 in sequence in the lower tower of the waste heat recovery tower 3 and perform a direct contact type heat and mass transfer process with high-temperature intermediate water sprayed out of the lower tower liquid distribution layer 13, and the combustion air leaves the lower tower of the waste heat recovery tower 3 after being heated and humidified and is sent into the boiler 1 after passing through an air duct demister 18.
The intermediate water flowing out of the upper tower liquid storage tank 11 of the waste heat recovery tower 3 is sprayed to the lower tower filler layer 12 from the lower tower liquid distribution layer 13, and then is subjected to a direct contact type heat and mass transfer process with combustion air and part of boiler flue gas, and the intermediate water falls into the lower tower liquid storage tank 17 after being cooled.
The intermediate water is led out from the lower tower liquid storage tank 17, passes through the second valve 14 and the second water pump 15, and is sent into the upper tower liquid distribution layer 5.
A second overflow port 16 is arranged above the lower tower liquid storage tank 17.
Claims (10)
1. The device for realizing deep recovery of the waste heat of the flue gas of the boiler and humidifying the air is characterized by comprising a boiler (1) and a waste heat recovery tower (3), wherein a natural gas inlet is formed in the boiler (1), and a flue gas outlet in the boiler (1) is respectively connected with an upper tower and a lower tower of the waste heat recovery tower (3);
an upper tower of the waste heat recovery tower (3) is provided with a smoke outlet;
and a high-temperature humidifying flue gas outlet is formed in the lower tower of the waste heat recovery tower (3) and is connected with an inlet of the boiler (1).
2. The device for realizing deep recovery of waste heat of boiler flue gas and air humidification as claimed in claim 1, wherein a first induced draft fan (19) is arranged between the outlet of the boiler (1) and the upper tower of the waste heat recovery tower (3).
3. The device for realizing deep recovery of waste heat of boiler flue gas and air humidification as claimed in claim 1, wherein a second induced draft fan (20) is arranged between the outlet of the boiler (1) and the lower tower of the waste heat recovery tower (3).
4. The device for realizing deep recovery of boiler flue gas waste heat and air humidification as claimed in claim 1, wherein an upper tower demister (6), an upper tower liquid distribution layer (5), an upper tower packing layer (4) and an upper tower liquid storage layer (11) are sequentially arranged in an upper tower inner cavity of the waste heat recovery tower (3) from top to bottom, wherein a smoke outlet on an upper tower of the waste heat recovery tower (3) is arranged above the upper tower demister (6); an intermediate water inlet is formed in the upper tower liquid distribution layer (5); an intermediate water outlet is arranged on the upper tower liquid storage layer (11) and is connected with the intermediate water inlet through a heat pump (2).
5. The device for realizing deep recovery of waste heat of boiler flue gas and air humidification as claimed in claim 4, wherein the flue gas inlet on the upper tower of the waste heat recovery tower (3) is arranged between the upper tower liquid storage layer (11) and the upper tower filler layer (4).
6. The device for realizing deep recovery of waste heat of boiler flue gas and air humidification as claimed in claim 4, wherein the upper tower of the waste heat recovery tower (3) is further provided with a first overflow port (10), and the first overflow port (10) is arranged above the upper tower liquid storage layer (11); an intermediate water outlet is formed in the bottom of the upper tower liquid storage layer (11), and the intermediate water outlet is communicated with the lower tower of the waste heat recovery tower (3).
7. The device for realizing deep recovery of waste heat of boiler flue gas and air humidification as claimed in claim 4, wherein a first valve (8) and a first water pump (9) are sequentially arranged between the intermediate water outlet on the upper tower liquid storage layer (11) and the heat pump (2).
8. The device for realizing deep recovery of waste heat of boiler flue gas and air humidification as claimed in claim 1, wherein a lower tower liquid distribution layer (13), a lower tower filler layer (12) and a lower tower liquid storage layer (17) are sequentially arranged in an inner cavity of a lower tower of the waste heat recovery tower (3) from top to bottom; wherein a high-temperature humidifying flue gas outlet on the lower tower of the waste heat recovery tower (3) is arranged above a lower tower liquid distribution layer (13); the lower tower liquid distribution layer (13) is provided with an intermediate water inlet which is communicated with the upper tower of the waste heat recovery tower (3); the lower tower liquid storage layer (17) is provided with an intermediate water outlet which is communicated with the upper tower of the waste heat recovery tower (3); and a flue gas inlet and an air inlet on the lower tower of the waste heat recovery tower (3) are both arranged between a lower tower liquid storage layer (17) and a lower tower packing layer (12).
9. The device for realizing deep recovery of waste heat of boiler flue gas and air humidification as claimed in claim 8, wherein the lower tower of the waste heat recovery tower (3) is further provided with a second overflow port (16), and the second overflow port (16) is arranged above the lower tower liquid storage layer (17).
10. The device for realizing deep recovery of waste heat of boiler flue gas and air humidification as claimed in claim 8, wherein a second valve (14) and a second water pump (15) are sequentially arranged between the intermediate water outlet arranged on the lower tower liquid storage layer (17) and the upper tower of the waste heat recovery tower (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020223257.4U CN211651283U (en) | 2020-02-27 | 2020-02-27 | Device for realizing deep recovery of boiler flue gas waste heat and air humidification |
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| CN202020223257.4U CN211651283U (en) | 2020-02-27 | 2020-02-27 | Device for realizing deep recovery of boiler flue gas waste heat and air humidification |
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| CN211651283U true CN211651283U (en) | 2020-10-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207605A (en) * | 2020-02-27 | 2020-05-29 | 中国华能集团清洁能源技术研究院有限公司 | Device and method for realizing deep recovery of boiler flue gas waste heat and air humidification |
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- 2020-02-27 CN CN202020223257.4U patent/CN211651283U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207605A (en) * | 2020-02-27 | 2020-05-29 | 中国华能集团清洁能源技术研究院有限公司 | Device and method for realizing deep recovery of boiler flue gas waste heat and air humidification |
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