CN210993575U - Device for eliminating and dehumidifying smoke plume by using waste heat of smoke - Google Patents
Device for eliminating and dehumidifying smoke plume by using waste heat of smoke Download PDFInfo
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- CN210993575U CN210993575U CN201921843808.0U CN201921843808U CN210993575U CN 210993575 U CN210993575 U CN 210993575U CN 201921843808 U CN201921843808 U CN 201921843808U CN 210993575 U CN210993575 U CN 210993575U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses an utilize device of surplus heat of flue gas to eliminate dehumidification plume, include: a mixing duct including an ambient air inlet, a hot air inlet, and a mixed air outlet; the air blower comprises an air inlet end and an air outlet end, and the air inlet end is communicated with the mixed air outlet; the heat exchanger comprises a flue gas inlet, a mixed air inlet, a heat exchange area, a flue gas outlet and a hot air outlet, the mixed air inlet is communicated with the air outlet end, the hot air outlet is respectively communicated with a circulating air channel and a heating air channel through a heat exchanger outlet air channel, the circulating air channel is communicated with the hot air inlet, and the flue gas outlet is communicated with the flue gas inlet of the purification tower; the flue gas mixer is arranged in a flue gas channel in a chimney of the purification tower and comprises a flue gas inlet, a hot air inlet, a mixing area and a flue gas mixed gas outlet, and the hot air inlet is communicated with the hot air channel.
Description
Technical Field
The utility model belongs to the technical field of exhaust-gas treatment, a processing technology of coloured cigarette feather is related to, especially, relate to an utilize device of flue gas waste heat elimination wet cigarette feather.
Background
When wet desulphurization is adopted for flue gas desulphurization, the flue gas at a desulphurization outlet is usually in a saturated humidity state, the saturated humidity flue gas is rapidly cooled by the atmosphere with lower temperature after being discharged from a chimney, water vapor in the flue gas is condensed into a liquid state, and the light transmittance is reduced, so that the phenomenon of white smoke plume visible to naked eyes appears; along with the diffusion of the water vapor in the atmosphere, the concentration of the water vapor is reduced, the light transmittance is improved, and the white smoke plume is slowly reduced until disappears and cannot be seen.
There are generally three solutions to reduce the appearance of white smoke: (1) smoke is condensed, the temperature of the smoke is reduced, the condensed moisture is extracted, the moisture of the smoke is reduced, the temperature difference between the smoke and the ambient air is reduced, the change curve of the smoke and the saturation curve are not intersected or the intersection section is reduced, and the white smoke emission phenomenon can be reduced or completely eliminated by the method; (2) heating the flue gas, and increasing the temperature of the flue gas to enable the flue gas parameters at the outlet of the chimney to be far away from the saturation curve; (3) the smoke is condensed and heated, so that the moisture of the discharged smoke can be reduced, and the smoke parameters at the outlet of the chimney can be far away from the saturation curve. Wherein, (2) flue gas heating and (3) first condensing and reheating are the main methods applied to the existing white-removing process.
However, the chimneys of many wet desulphurization devices are placed on the top of the desulphurization tower and are integrally arranged with the smoke tower. Therefore, no reserved space and load are generally provided, and if the flue gas condensing or reheating heat exchanger is additionally arranged on a chimney at the top of the tower, the modification amount of the desulfurizing tower is very large, the investment for engineering implementation is large, and the construction period is long.
The flue gas reheating is not limited to heating by using a heat exchanger at a chimney, and one of flue gas heating modes is mixed air heating, namely, a certain amount of hot air is mixed with clean flue gas at the outlet of a desulfurizing tower, so that the temperature of the mixed clean flue gas is improved. The purified flue gas temperature can be increased while the flue gas humidity can be reduced, which is equivalent to further increasing the superheat degree, thereby eliminating white smoke plume.
The hot air source that usually needs is that ambient air passes through the heat transfer with desulfurizing tower entry flue gas promptly and obtains, in order to prevent the low temperature corrosion of flue gas and air heat exchanger, can not directly be with the heat transfer of ambient cold air and hot flue gas, need do the heat transfer with the flue gas after the cold air is properly preheated.
Therefore, the primary steam, the heat medium water or the electric heater is added before or after heat exchange with the flue gas to heat the air, but the air volume of the mixed ambient air is large, so that a large amount of energy is consumed for heating the ambient air, and the operation cost is high.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides an utilize surplus heat of flue gas to eliminate device of dehumidification plume. This utilize device of flue gas waste heat elimination wet smoke plume need not set up the flue gas reheater on the top of the tower chimney, and is little to the absorption tower transformation volume, and hot-air mainly is through exchanging heat with ambient air and the former flue gas of high temperature and producing in addition, reduces the quantity of steam or heat medium water by a wide margin, and is energy-conserving effectual.
Therefore, the utility model provides an utilize device of surplus heat of flue gas to eliminate wet smoke plume, include:
a mixing duct including an ambient air inlet, a hot air inlet, and a mixed air outlet;
the air blower comprises an air inlet end and an air outlet end, and the air inlet end is communicated with the mixed air outlet;
the heat exchanger comprises a flue gas inlet, a mixed air inlet, a heat exchange area, a flue gas outlet and a hot air outlet, the mixed air inlet is communicated with the air outlet end, the hot air outlet is communicated with a heat exchanger outlet air channel, the heat exchanger outlet air channel is respectively communicated with a circulating air channel and a heating air channel, the circulating air channel is communicated with the hot air inlet, and the flue gas outlet is communicated with the flue gas inlet of the purification tower;
the flue gas mixer is arranged in a flue gas channel in a chimney of the purification tower and comprises a flue gas inlet, a hot air inlet, a mixing area and a flue gas mixed gas outlet, and the hot air inlet is communicated with the hot air channel.
Utilize flue gas waste heat to eliminate device of wet smoke plume, wherein preferred, still include:
the preheater comprises a cold air inlet, a heat source inlet, a heat exchange zone, a preheated air outlet and a heat source outlet, and the preheated air outlet is communicated with the ambient air inlet.
At this moment, utilize surplus heat of flue gas to eliminate device of dehumidification plume specifically describe as including:
the preheater comprises a cold air inlet, a heat source inlet, a heat exchange zone, a preheated air outlet and a heat source outlet;
the air blower comprises an air inlet end and an air outlet end, and the air inlet end is communicated with the preheated air outlet through a preheater outlet air duct;
the heat exchanger comprises a flue gas inlet, a mixed air inlet, a heat exchange area, a flue gas outlet and a hot air outlet, the hot air outlet is respectively communicated with a circulating air channel and a heating air channel through a heat exchanger outlet air channel, the circulating air channel is communicated with a preheater outlet air channel, and the flue gas outlet is communicated with a flue gas inlet of the purification tower;
the flue gas mixer is arranged in a flue gas channel in a chimney of the purification tower and comprises a flue gas inlet, a hot air inlet, a mixing area and a flue gas mixed gas outlet, and the hot air inlet is communicated with the hot air channel.
Utilize flue gas waste heat to eliminate device of wet smoke plume, wherein preferred, the heat source of pre-heater is steam, hot media water or hot media oil.
Utilize flue gas waste heat to eliminate device of wet cigarette feather, wherein preferred, the heat exchanger is tube bundle heat exchanger or plate heat exchanger.
Utilize flue gas waste heat to eliminate device of wet cigarette feather, wherein preferred, heat exchanger export wind channel with circulation wind channel intercommunication department is equipped with flow regulator, perhaps heat exchanger export wind channel with it is equipped with flow regulator to add hot-blast wind channel intercommunication department.
The device for eliminating the wet smoke plume by using the waste heat of the smoke is preferably characterized in that the purification tower is a desulfurizing tower or a washing tower.
The utility model discloses an effect does: the utility model discloses an in the device, hot-air is direct to carry out the hybrid heating with clean flue gas, need not set up the flue gas reheater on the chimney of top of the tower, consequently little to the absorption tower transformation volume, and hot-air mainly is through exchanging heat with the former flue gas of ambient air and high temperature in addition, reduces the use to extra heat source, and is energy-conserving effectual.
The utility model discloses a device can the maximize utilize the heat of former flue gas, will send into to air-blower entry and ambient air mixture with hot-air after the former flue gas heat transfer partly, improves air-blower entry air temperature, and the chimney is sent into to another part and is mixed with clean flue gas. The amount of steam or heating medium water is reduced, energy is saved, and meanwhile, the mixed air temperature can be conveniently controlled under different working conditions, and the method is as follows.
When the air volume of the hot air required by the white-removing process in summer is reduced, the proportion of the circulated hot air and the heated gas can be adjusted, even a heat source such as steam is stopped, namely the first-stage preheating process is stopped, the air is heated by utilizing the waste heat of the flue gas to the maximum extent by adopting the second-stage preheating process, and the white-removing target is realized; when extremely cold weather is met in winter and the air quantity or the air temperature of hot air (heated air) required by the white fading process rises, the heat exchange quantity of a heat source such as steam can be increased or the proportion of the circulated hot air and the heated air can be adjusted through an air door (or a flow regulator), so that the white fading target is achieved.
The utility model discloses a device, the preheating process in two stages, steam preheats (first stage preheating process) and the circulation mixes the wind and preheats (second stage preheating process) in the pre-heater promptly, complements each other, under the condition that can not cause corrosion problems to equipment, utilizes the flue gas waste heat to the maximize, and the energy saving reduces the consumption, and overall economic value in the entire system operation life cycle is higher.
Drawings
Fig. 1 is a schematic structural view of the device for eliminating wet smoke plume by using the residual heat of smoke.
Wherein the reference numerals are:
1. a cold air inlet duct; 2. a preheater; 3. an outlet duct of the preheater; 4. a blower; 5. an air outlet duct of the blower; 6. a heat exchanger; 7. an outlet duct of the heat exchanger; 8. a circulating air duct; 9. heating an air duct; 10. a flue gas duct; 11. an outlet flue of the heat exchanger; 12. a preheater heat source inlet line;
13. a preheater heat source outlet line; 14. a chimney; 15. a flue gas mixer; 16. a desulfurizing tower.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In some embodiments, the device for eliminating wet smoke plume by using the waste heat of smoke, provided by the present invention, in operation, as shown in fig. 1, ambient air, i.e. cold air, enters the preheater 2 through the cold air inlet duct 1, and at the same time, steam enters the preheater 2 through the heat source inlet pipeline 12 of the preheater 2, and in the preheater 2, the steam is cooled to generate condensed water, which is discharged through the heat source outlet pipeline 13 of the preheater; the primary preheating (first heating) of the ambient air results in preheated ambient air which enters the preheater outlet duct 3 where it is mixed with the hot air in the circulating duct 8 (second heating) resulting in mixed air at a re-increased temperature.
Under the suction of the air blower 4, the mixed air enters the air blower 4 and enters the heat exchanger 6 through the air blower outlet air duct 5, meanwhile, the raw flue gas enters the heat exchanger 6 through the flue gas duct 10, in the heat exchanger 6, the raw flue gas enters the purification tower (here, the desulfurization tower 16) through the heat exchanger outlet air duct 11 after being cooled, and the mixed air is heated for the third time to obtain hot air.
Then, the hot air enters the heat exchanger outlet air duct 7 and then is divided into two parts, one part enters the circulating air duct 8, and then is mixed with preheated ambient air at the preheater outlet air duct 3, so that the temperature of the ambient air is raised, and secondary heating is carried out; the other part enters a smoke mixer 15 arranged in a smoke channel of the chimney 14 through the heating air duct 9, so that the other part is mixed with the clean smoke, the temperature of the clean smoke is heated, and the aim of eliminating the trailing phenomenon of the white smoke is achieved.
The heat exchanger 6 may take many forms, in some embodiments, a tube bundle heat exchanger, and in other embodiments, a plate heat exchanger.
In some embodiments, the material of the heat exchanger is a metal or an alloy.
All the air ducts and flues (such as the cold air inlet air duct 1, the preheater outlet air duct 3, the blower outlet air duct 5, the heat exchanger outlet air duct 7, the circulating air duct 8, the heating air duct 9, the raw flue gas flue 10, and the heat exchanger outlet flue 11) may be rectangular or circular, and are not limited herein. The material may be metal, alloy, or other material such as glass fiber reinforced plastic, and is not limited herein.
Example 1
Adopt the utility model discloses flue gas heating's device, if want to make the wet flue gas of exhaust in the chimney eliminate white smoke feather from the vision, need with 150000Nm3The/h smoke is heated from 45 ℃ to 65 ℃, and the goal of white elimination can be achieved when the smoke is discharged to the atmosphere.
Wherein, the heating process needs to heat the clean smoke from 45 ℃ to 65 ℃, the temperature of the large-flow smoke is raised to 20 ℃, the hot air and the smoke are mixed for heating, and about 36000Nm3The hot air (150 ℃) is mixed with the smoke gas to meet the process requirements and eliminate the colored smoke plume.
36000Nm are firstly sucked by the blower 43The/h of ambient air (-10 ℃) is introduced into the preheater 2, where it is preheated in a first stage by heat exchange with steam, heated to 20 ℃ and then mixed with the hot air in the circulation duct 8 (42000 Nm)3H, 150 ℃) to 90 ℃ to finish the second stage of preheating, and the obtained mixed air is 78000Nm3/h(90℃)。
Sending the mixed air into a heat exchanger 6 through a blower 4, and heating the mixed air from 90 ℃ to 150 ℃ through heat exchange with the raw flue gas to obtain hot air; meanwhile, the original smoke is reduced from 180 ℃ to 150 ℃.
The hot air obtained is divided into two portions, one portion (42000 Nm)3At 150 ℃ C./h, is circulated back to the preheater outlet flue 3 to mix with ambient air and another portion of the heated air (36000 Nm)3And/h, 150 ℃) is sent into a chimney at the top of the desulfurization tower through a heating air duct 9 to be directly mixed with clean flue gas (45 ℃) at 65 ℃.
The purified flue gas reduces the humidity while the temperature is raised, which is equivalent to further raising the degree of superheat, thereby eliminating white plume.
The utility model discloses a concrete effect analysis of device as follows:
(1) ambient air is divided into three heating stages. The first stage is a steam (or other heat sources such as heating medium water) preheating stage, and a preheater is adopted for preheating; the second stage is a mixed air preheating stage, and hot air at the downstream of the mixing heat exchanger is used for preheating; the third stage is a heat exchange heating stage, and the heat of the original flue gas is utilized to heat air. The first stage preheating and the second stage preheating can complement each other, so that respective output force can be adjusted conveniently according to actual working conditions, the waste heat of the flue gas is utilized to the greatest extent, and the energy consumption is reduced.
(2) And a part of hot air after heat exchange with the high-temperature raw flue gas returns to the inlet of the blower and is mixed with the ambient air to achieve the effect of preheating the ambient air, and the heat of the raw flue gas is actually utilized in the second preheating stage. The other part enters a chimney to be mixed with the clean smoke, so that the aim of heating the smoke is fulfilled. The proportion of the two gases can be adjusted according to the actual working condition
(3) The flue gas reheating mode does not need to greatly change a desulfurizing tower and a chimney, and the engineering modification amount is small.
(4) The method and the device are simple, and the device has small overhaul workload.
(5) Can avoid the low temperature corrosion of the smoke-air heat exchanger.
It should be noted that the above-mentioned preferred embodiments are only used for illustrating the present invention, but the present invention is not limited to the above-mentioned embodiments, and the variations and modifications made by those skilled in the art within the scope of the present invention are all within the protection scope of the present invention.
Claims (6)
1. Utilize device of flue gas waste heat elimination wet smoke plume, its characterized in that includes:
a mixing duct including an ambient air inlet, a hot air inlet, and a mixed air outlet;
the air blower comprises an air inlet end and an air outlet end, and the air inlet end is communicated with the mixed air outlet;
the heat exchanger comprises a flue gas inlet, a mixed air inlet, a heat exchange area, a flue gas outlet and a hot air outlet, the mixed air inlet is communicated with the air outlet end, the hot air outlet is communicated with a heat exchanger outlet air channel, the heat exchanger outlet air channel is respectively communicated with a circulating air channel and a heating air channel, the circulating air channel is communicated with the hot air inlet, and the flue gas outlet is communicated with the flue gas inlet of the purification tower;
the flue gas mixer is arranged in a flue gas channel in a chimney of the purification tower and comprises a flue gas inlet, a hot air inlet, a mixing area and a flue gas mixed gas outlet, and the hot air inlet is communicated with the hot air channel.
2. The device for eliminating the moisture smoke plume by using the waste heat of the smoke as claimed in claim 1, further comprising:
the preheater comprises a cold air inlet, a heat source inlet, a heat exchange zone, a preheated air outlet and a heat source outlet, and the preheated air outlet is communicated with the ambient air inlet.
3. The device for eliminating the wet smoke plume by using the residual heat of the flue gas as claimed in claim 2, wherein the heat source of the preheater is steam, hot water or hot oil.
4. The device for eliminating the moisture smoke plume by using the waste heat of the smoke as claimed in claim 1, wherein the heat exchanger is a tube bundle heat exchanger or a plate heat exchanger.
5. The device for eliminating the smoke plume through the waste heat of the smoke according to claim 1, wherein a flow regulator is arranged at the communication position of the heat exchanger outlet air duct and the circulating air duct, or a flow regulator is arranged at the communication position of the heat exchanger outlet air duct and the heating air duct.
6. The device for eliminating the moisture smoke plume by using the waste heat of the smoke as claimed in claim 1, wherein the purification tower is a desulfurization tower or a washing tower.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921843808.0U CN210993575U (en) | 2019-10-29 | 2019-10-29 | Device for eliminating and dehumidifying smoke plume by using waste heat of smoke |
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| CN201921843808.0U CN210993575U (en) | 2019-10-29 | 2019-10-29 | Device for eliminating and dehumidifying smoke plume by using waste heat of smoke |
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| CN210993575U true CN210993575U (en) | 2020-07-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112742154A (en) * | 2019-10-29 | 2021-05-04 | 北京万信同和能源科技有限公司 | Device and method for eliminating wet smoke plume by using waste heat of smoke |
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2019
- 2019-10-29 CN CN201921843808.0U patent/CN210993575U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112742154A (en) * | 2019-10-29 | 2021-05-04 | 北京万信同和能源科技有限公司 | Device and method for eliminating wet smoke plume by using waste heat of smoke |
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