CN216281475U - Heat recovery system of recycling of wet flue gas desulfurization - Google Patents
Heat recovery system of recycling of wet flue gas desulfurization Download PDFInfo
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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 relates to the technical field of desulfurization, in particular to a heat recovery and reuse system for wet desulfurization tail gas. The system comprises a cooling and condensing tower and an air preheating tower, wherein the cooling and condensing tower and the air preheating towerThe hot tower is respectively provided with an air inlet and an air outlet; a condensation spray device is fixedly installed in the cooling condensation tower, and a preheating spray device is fixedly installed in the air preheating tower; the condensation spraying device comprises at least one spraying layer, and each spraying layer is communicated with the air preheating tower through a pipeline; the preheating spraying device comprises at least one spraying layer, and each spraying layer is communicated with the cooling condensation tower through a pipeline. The system can recover heat in the desulfurization tail, and prevent white smoke after being discharged; the recovered heat can be used for preheating the boiler, so that energy is saved; the spraying device can also be used. The residual SO in the flue gas can be removed by the leaching of the low-temperature circulating water2、NO2And pollutants such as desulfurization slurry dust and the like, and realizes deep purification.
Description
Technical Field
The utility model relates to the technical field of desulfurization, in particular to a heat recovery and reuse system for wet desulfurization tail gas.
Background
With the further development of urbanization, the central heating area of the city is further increased, and the total heating amount is increased; and with CO2The work required by emission reduction is deep, and the number of newly built units in the coal-fired heating project in the city is reduced inevitably; the total heating difference between the two will bring the demand of low temperature waste heat recovery technology and the development of application market, therefore, the low temperature waste heat recovery will become the important development direction of market.
Limestone-gypsum wet desulphurization technology is the most widely used and mature flue gas desulphurization technology, the smoke discharging temperature is generally between 50 ℃ and 60 ℃, and due to the low external environment temperature, when the desulfurized flue gas is discharged, the water vapor in the flue gas can be rapidly condensed due to the large temperature difference, so that a large amount of white smoke can be generated to emerge from a chimney opening, and visual pollution is caused.
In addition, the direct discharge of heat in the desulfurized tail gas can cause the waste of heat energy, so that the desulfurized tail gas is directly discharged, the requirements of environmental protection and green development are not met, the waste of heat can be caused, and visual pollution can be generated.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a heat recovery and reuse system for wet desulphurization tail gas.
The technical scheme for solving the technical problems is as follows:
the utility model provides a heat recovery and reuse system of wet desulphurization tail gas, which comprises a cooling and condensing tower and an air preheating tower, wherein the cooling and condensing tower and the air preheating tower are respectively provided with an air inlet and an air outlet; a condensation spray device is fixedly installed in the cooling condensation tower, and a preheating spray device is fixedly installed in the air preheating tower; the condensation spraying device comprises at least one spraying layer, and each spraying layer is communicated with the air preheating tower through a pipeline; the preheating spraying device comprises at least one spraying layer, and each spraying layer is communicated with the cooling condensation tower through a pipeline.
The technical scheme of the utility model has the beneficial effects that: the heat exchange between the wet desulphurization tail gas and the ambient air for recovering heat can be respectively carried out by arranging the cooling and condensing tower and the air preheating tower which are communicated with each other, so that the heat in the wet desulphurization tail gas is recovered, and the visual pollution caused by the generation of 'white smoke' after the wet desulphurization tail gas is discharged is prevented; the heated ambient air can be used for preheating the boiler, so that energy is saved; through the pipeline that sets up condensation spray set, preheat spray set and intercommunication, can realize that cooling water circulates between cooling condensation tower and air preheating tower, has saved the quantity of cooling water.
The utility model can be realized by the following further technical scheme:
further, a first air inlet is formed in the side wall of the cooling and condensing tower, a first air outlet is formed in the top of the cooling and condensing tower, and the condensing and spraying device is located between the first air inlet and the first air outlet in the vertical direction; the side wall of the air preheating tower is provided with a second air inlet, and the top of the air preheating tower is provided with a second air outlet; the preheating spraying device is located between the second air inlet and the second air outlet in the vertical direction.
The beneficial effect of adopting the further technical scheme is as follows: the condensation spraying device is arranged between the first air inlet and the first air outlet, so that the low-temperature circulating water sprayed downwards and the tail gas moving upwards have enough large contact area and contact time, the heat exchange process can be prolonged, the tail gas and cooling can be subjected to sufficient heat exchange, and the heat recovery efficiency is improved; the effect on preheating the shower device is the same as described above.
Further, the position of each spraying layer of the condensation spraying device communicated with the air preheating tower is positioned at the lower side of the second air inlet; and the position of each spraying layer of the preheating spraying device communicated with the cooling condensation tower is positioned on the lower side of the first air inlet.
The beneficial effect of adopting the further technical scheme is as follows: the low-temperature circulating water or the high-temperature circulating water sprayed by the spraying layer can quickly flow out and circulate after falling to the bottom of the cooling condensation tower or the air preheating tower, so that the circulating water can be prevented from excessively remaining at the bottom of the cooling condensation tower or the air preheating tower; therefore, the circulating efficiency of the circulating water can be improved, and the total consumption of the circulating water can be reduced.
Further, a demister is fixedly installed on the cooling and condensing tower and is positioned on the upper side of the condensing and spraying device in the vertical direction.
The beneficial effect of adopting the further technical scheme is as follows: through setting up the defroster, can be with the desulfurization tail gas after the heat transfer by first gas outlet before discharging, detach the liquid drop that wherein contains, further avoid producing "white cigarette" by the steam constitution after the discharge.
Further, a circulating spray device is fixedly installed in the air preheating tower, and the circulating spray device is located on the upper side of the preheating spray device in the vertical direction; and a circulating pipeline is arranged outside the air preheating tower, a liquid inlet of the circulating pipeline is communicated with the lower part of the air preheating tower, and a liquid outlet of the circulating pipeline is communicated with the circulating spray device.
The beneficial effect of adopting the further technical scheme is as follows: the self-circulation of the low-temperature circulating water in the air preheating tower can be realized.
Furthermore, a valve and a discharge pump are arranged on a pipeline connected with each spraying layer, the discharge pump is close to the spraying layer communicated with the pipeline, and the valve is far away from the spraying layer communicated with the pipeline.
The beneficial effect of adopting the further technical scheme is as follows: independent control of each spray layer can be achieved.
Further, the lower part of the air preheating tower is also communicated with an external discharge pipeline.
The beneficial effect of adopting the further technical scheme is as follows: the circulating water is convenient to discharge.
Drawings
Fig. 1 is a schematic structural diagram of a heat recovery and reuse system for wet flue gas desulfurization according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. cooling the condensation tower; 2. an air preheating tower; 3. a first air inlet; 4. a condensation spraying device; 5. a demister; 6. a first discharge pump; 7. a second discharge pump; 8. a third discharge pump; 9. a fourth discharge pump; 10. a second air inlet; 11. preheating a spraying device; 12. a circulating spray device; 13. a first air outlet; 14. a second air outlet; 15. a circulation line; 16. and an outer discharge pipeline.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model.
As shown in fig. 1, the heat recovery and reuse system for wet desulphurization tail gas comprises a cooling and condensing tower 1 and an air preheating tower 2, wherein the cooling and condensing tower 1 and the air preheating tower 2 are respectively provided with an air inlet and an air outlet; a condensation spray device 4 is fixedly arranged in the cooling condensation tower 1, and a preheating spray device 11 is fixedly arranged in the air preheating tower 2; the condensation spraying device 4 comprises at least one spraying layer, and each spraying layer is communicated with the air preheating tower 2 through a pipeline; the preheating spraying device 11 comprises at least one spraying layer, and each spraying layer is communicated with the cooling condensation tower 1 through a pipeline.
According to the heat recovery and reuse system, the cooling and condensing tower 1 and the air preheating tower 2 which are communicated with each other are arranged, so that heat exchange can be respectively carried out on the wet desulphurization tail gas and the ambient air used for recovering heat, the heat in the wet desulphurization tail gas is recovered, and the heated ambient air can be reused; through setting up condensation spray set 4, preheating spray set 11 and the pipeline of intercommunication, can realize that the cooling water circulates between cooling condensation tower 1 and air preheating tower 2, has saved the quantity of cooling water.
In addition, after the wet desulphurization tail gas is treated by adopting the heat recovery and reuse system, the desulphurization tail gas is mixed with outside air when being discharged, the condition of supersaturation of humidity basically does not occur, and water vapor cannot be condensed out, namely the phenomenon of white smoke plume does not occur. Meanwhile, in the cooling and condensing tower 1, the low-temperature circulating water leaches the desulfurization tail gas to ensure that residual SO is contained in the desulfurization tail gas2、NO2And pollutants such as desulfurization slurry dust and the like are further removed, and the deep purification function is realized.
In the above embodiment, preferably, the side wall of the cooling and condensing tower 1 is provided with the first gas inlet 3, the top of the cooling and condensing tower is provided with the first gas outlet 13, and the condensing and spraying device 4 is located between the first gas inlet 3 and the first gas outlet 13 in the vertical direction; the side wall of the air preheating tower 2 is provided with a second air inlet 10, and the top of the air preheating tower is provided with a second air outlet 14; the preheating spraying device 11 is positioned between the second air inlet 10 and the second air outlet 14 in the vertical direction; the first air inlet 3 is arranged on the side wall of the cooling and condensing tower 1, so that wet desulphurization tail gas can be conveniently introduced into the cooling and condensing tower 1, and the first air outlet 13 is arranged at the top of the cooling and condensing tower 1, so that the tail gas can flow from bottom to top; set up condensation spray set 4 between first air inlet 3 and first gas outlet 13, can make the low temperature circulating water that sprays downwards and the tail gas of upward movement have enough big area of contact and contact time, can prolong the heat transfer process, make can abundant heat transfer between tail gas and the cooling, improve heat recovery's efficiency. The advantages of the air preheating tower 2, the second air inlet 10, the second air outlet 14 and the preheating spraying device 11 are the same as those of the cooling and condensing tower 1.
In the above embodiment, it is preferable that the position where each spraying layer of the condensation spraying device 4 communicates with the air preheating tower 2 is located on the lower side of the second air inlet 10; the position of each spraying layer of the preheating spraying device 11 communicated with the cooling condensation tower 1 is positioned at the lower side of the first air inlet 3; thus, after the low-temperature circulating water or the high-temperature circulating water sprayed by the spraying layer falls to the bottom of the cooling and condensing tower 1 or the air preheating tower 2, the low-temperature circulating water or the high-temperature circulating water can quickly flow out and circulate, so that the circulating water can be prevented from being excessively reserved at the bottom of the cooling and condensing tower 1 or the air preheating tower 2; therefore, the circulating efficiency of the circulating water can be improved, and the total consumption of the circulating water can be reduced.
In addition, the circulating water actually exchanges heat with the external part all the time in the circulating flowing process. If the high-temperature circulating water after absorbing heat is retained in the cooling and condensing tower 1 for a long time, part of heat in the high-temperature circulating water is released into the cooling and condensing tower 1 again, and even possibly recombined with the desulfurization tail gas, so that the heat recovery rate in the desulfurization tail gas is reduced; if the low-temperature circulating water is stored in the air preheating tower 2 for a long time, some heat may be absorbed again, so that the effect of cooling the desulfurization tail gas by circulating the low-temperature circulating water into the cooling and condensing tower 1 again is poor.
In the above embodiment, preferably, the condensation spraying device 4 and the preheating spraying device 11 may have a plurality of spraying layers respectively, and the plurality of spraying layers are arranged in a stacked manner; set up a plurality of layers that spray, can further improve the heat transfer effect, make the heat in the desulfurization tail gas can be retrieved more thoroughly.
In the above embodiment, it is preferable that the first air inlet 3 and the second air inlet 10 are respectively communicated with one air inlet duct, and both air inlet ducts are arranged obliquely upward; through setting up the inlet duct of slope, can make desulfurization tail gas and ambient air can earlier one section distance of downflow when letting in respectively in cooling condensing tower 1 and the air preheating tower 2, can further increase the contact time and the area of contact between desulfurization tail gas and ambient air and the circulating water that sprays like this to further improve heat exchange efficiency and speed.
In the above embodiment, preferably, the cooling and condensing tower 1 is fixedly provided with the demister 5, and the demister 5 is located at the upper side of the condensing and spraying device 4 in the vertical direction; through setting up defroster 5, can be with the desulfurization tail gas after the heat transfer by first gas outlet 13 before discharging, detach the liquid drop that wherein contains, further avoid producing "white cigarette" by the steam constitution after the discharge.
In the above embodiment, preferably, the air preheating tower 2 is fixedly provided with the circulating spray device 12, and the circulating spray device 12 is located at the upper side of the preheating spray device 11 in the vertical direction; a circulating pipeline 15 is arranged outside the air preheating tower 2, a liquid inlet of the circulating pipeline 15 is communicated with the lower part of the air preheating tower 2, and a liquid outlet of the circulating pipeline 15 is communicated with the circulating spray device 12; through setting up circulation spray set 12 and circulation pipeline 15, can make the low temperature circulating water after carrying out the heat exchange cycle heat transfer once more, improve ambient air to the thermal absorption rate in the circulating water, make heat recovery more complete.
In principle, some parts such as the circulating pipeline 15 and the circulating spraying device 12 can be arranged in the cooling and condensing tower 1 to enable the circulating water in the cooling and condensing tower to be self-circulated; however, in practical use, experiments show that when heat is exchanged in the air preheating tower 2, the circulating water releases heat to the ambient air, the temperature of the circulating water is reduced, and when the low-temperature circulating water is self-circulated through the circulating pipeline 15 and the circulating spray device 12, the temperature of the low-temperature ambient air which is always introduced can be continuously reduced, so that the effect of the self-circulation device is remarkable; however, when heat exchange is performed in the cooling and condensing tower 1, the circulating water absorbs heat in the desulfurization tail gas, the temperature rises from low to high, the circulating water with the raised temperature is circulated again to continuously absorb the high-temperature desulfurization tail gas continuously introduced, and the effect of heat recovery is not obvious; therefore, in order to simplify the system configuration, the circulation line 15 and the circulation shower device 12 are provided only in the air preheating tower 2.
In the above embodiment, preferably, a valve and a discharge pump are disposed on the pipeline connected to each spraying layer, the discharge pump is close to the spraying layer communicated with the pipeline, and the valve is far from the spraying layer communicated with the pipeline; through set up independent valve and discharge pump on every pipeline that communicates, can make every layer that sprays receive independent control, make this system more nimble.
In the above embodiment, preferably, the lower part of the air preheating tower 2 is further communicated with an external discharge pipeline 16, and the external discharge pipeline 16 is communicated with a circulating water recovery device; by arranging the external discharge pipeline 16, the residual circulating water in the air preheating tower 2 can be cleaned and recovered conveniently.
The heat recovery and reutilization method of the wet desulphurization tail gas adopts the system to recover and reutilize heat, and transfers the heat of the wet desulphurization tail gas to air for recovering the heat through water in two heat exchange processes.
By adopting the heat recovery and reuse method of the wet desulphurization tail gas, the heat in the wet desulphurization tail gas can be recovered, the recovered heat can be transferred to the air, and the high-temperature air absorbing the heat can be used in other systems or processes needing heating, for example, the high-temperature air can be introduced into a boiler and used for preheating the boiler, so that the energy can be saved, and the method has the advantage of reducing the production cost.
In addition, after the heat-exchanged desulfurization tail gas is discharged to the external environment, the temperature of the desulfurization tail gas is reduced, so that the occurrence of white smoke can be prevented to a certain extent, and visual pollution is prevented.
The first heat exchange is that the desulfurization tail gas is introduced into the cooling and condensing tower 1 through the gas inlet, and the condensation and spraying device 4 sprays low-temperature circulating water at the same time, so that the low-temperature circulating water and the desulfurization tail gas exchange heat and are converted into high-temperature circulating water; the second heat exchange is that air is introduced into the air preheating tower 2 through the air inlet, and meanwhile, high-temperature circulating water circulates to the preheating spraying device 11 and is sprayed into the air preheating tower 2, so that the high-temperature circulating water exchanges heat with the air and is converted into low-temperature circulating water; after the second heat exchange, the low-temperature circulating water circulates into the cooling and condensing tower 1 again, and the first heat exchange is repeated.
The temperature of the low-temperature circulating water is lower than the temperature of the desulfurization tail gas introduced into the cooling and condensing tower 1; the temperature of the high-temperature circulating water is higher than that of the air introduced into the air preheating tower 2.
It should be noted that, in the initial state, because there is no circulating water in the system, a certain amount of circulating water needs to be introduced into the system for starting the above-mentioned heat exchange cycle.
Since the system is not yet in communication with the desulfurized tail gas or the ambient air in the initial state, it is theoretically possible to add the low-temperature circulating water to the cooling-condensing tower 1 or the air-preheating tower 2 through an arbitrary opening. When low-temperature circulating water exists in the system, the heat exchange and circulation of the low-temperature circulating water can be realized by providing power by each discharge pump.
Preferably, initially, a certain amount of low-temperature circulating water may be introduced through the second inlet port 10. After the heat exchange, a discharge pump on a pipeline communicated with the condensation spraying device 4 is started, and simultaneously, the desulfurization tail gas to be subjected to heat exchange is introduced through the first air inlet 3, so that the first heat exchange in the cooling and condensing tower 1 is realized.
After the low-temperature circulating water is introduced, the second air inlet 10 can be communicated with ambient air to prepare for the heat exchange process in the air preheating tower 2.
The technical solution of the present invention is illustrated by the following specific examples:
example 1
As shown in fig. 1, in the heat recovery and reuse system of wet desulfurization tail gas of the present embodiment, the condensation spraying device 4 includes a spraying layer, and the preheating spraying device 11 also includes a spraying layer.
In addition to the components and devices already described above, a first discharge pump 6, a second discharge pump 7, a third discharge pump 8, and a fourth discharge pump 9 are also included; the first discharge pump 6 is arranged on a pipeline which is communicated with the cooling and condensing tower 1 by the preheating spray device 11, a valve is also arranged on the pipeline, and the valve is close to the cooling and condensing tower 1; the second discharge pump 7 is arranged on a pipeline which is communicated with the air preheating tower 2 by the condensation spraying device 4, and a valve is also arranged on the pipeline and is close to the air preheating tower 2; the third discharge pump 8 is arranged on a circulating pipeline 15, a valve is also arranged on the pipeline, and the valve is close to the bottom of the air preheating tower 2; the fourth discharge pump 9 is mounted on an external discharge line 16, which is also provided with a valve, and the valve is close to the air preheating tower 2.
In this embodiment, the pipelines are all connected with the valves, the discharge pump and the spray layer by flanges.
The working process of the embodiment is as follows:
at the beginning, a certain amount of low-temperature circulating water is introduced through the second air inlet 10. When the low-temperature circulating water reaches the set liquid level, the second discharge pump 7 is started, and simultaneously the desulfurization tail gas to be subjected to heat exchange is introduced through the first air inlet 3.
The condensation spraying device 4 sprays low-temperature circulating water, so that the low-temperature circulating water exchanges heat with the desulfurization tail gas and is converted into high-temperature circulating water; the heat-exchanged desulfurization tail gas is discharged out of the system from the first gas outlet 13.
When the high-temperature circulating water reaches a set liquid level, starting the first discharge pump 6 to circulate the high-temperature circulating water to the preheating spraying device 11 and spray the high-temperature circulating water into the air preheating tower 2, and simultaneously introducing air into the air preheating tower 2 through the second air inlet 10 to exchange heat between the high-temperature circulating water and the air and convert the high-temperature circulating water into low-temperature circulating water; the air after heat exchange is discharged from the second air outlet 14 and introduced into the boiler system to preheat the boiler.
And circulating the low-temperature circulating water into the cooling and condensing tower 1 again, and repeating the first heat exchange.
In the above process, after the high-temperature circulating water exchanges heat with the air, the third discharge pump 8 can be started at the same time, so that a part of low-temperature circulating water self-circulates in the air preheating tower 2 through the circulating pipeline 15 and the circulating spray device 12.
In this embodiment, the temperature of the low-temperature circulating water is lower than the temperature of the desulfurization tail gas introduced into the cooling and condensing tower 1; the temperature of the high-temperature circulating water is higher than that of the air introduced into the air preheating tower 2. Wherein the temperature of the introduced desulfurization tail gas is 50-60 ℃, the temperature of the introduced air is 0-10 ℃, the temperature of a heat exchange area in the cooling and condensing tower 1 is 30-45 ℃, and the temperature of a heat exchange area in the air preheating tower 2 is 25-40 ℃.
System pair using the embodimentAfter the heat in the wet desulphurization tail gas is recovered, the phenomenon of 'white smoke plume' does not appear when the tail gas is discharged. And the SO in the tail gas is detected2、NO2And the content of pollutants such as desulfurization slurry dust and tail gas which is not treated by the system is lower, which shows that the deep purification function is realized.
In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The heat recovery and reuse system for the wet desulphurization tail gas is characterized by comprising a cooling and condensing tower (1) and an air preheating tower (2), wherein the cooling and condensing tower (1) and the air preheating tower (2) are respectively provided with an air inlet and an air outlet;
a condensation spray device (4) is fixedly arranged in the cooling condensation tower (1), and a preheating spray device (11) is fixedly arranged in the air preheating tower (2);
the condensation spraying device (4) comprises at least one spraying layer, and each spraying layer is communicated with the air preheating tower (2) through a pipeline;
the preheating spraying device (11) comprises at least one spraying layer, and each spraying layer is communicated with the cooling condensation tower (1) through a pipeline.
2. The heat recovery and reuse system of wet desulphurization tail gas according to claim 1, wherein the side wall of the cooling and condensing tower (1) is provided with a first gas inlet (3), the top is provided with a first gas outlet (13), and the condensation spray device (4) is located between the first gas inlet (3) and the first gas outlet (13) in the vertical direction;
a second air inlet (10) is formed in the side wall of the air preheating tower (2), and a second air outlet (14) is formed in the top of the air preheating tower; the preheating spraying device (11) is located between the second air inlet (10) and the second air outlet (14) in the vertical direction.
3. The heat recovery and reuse system of wet desulfurization tail gas according to claim 2,
the position of each spraying layer of the condensation spraying device (4) communicated with the air preheating tower (2) is positioned at the lower side of the second air inlet (10);
and the position of each spraying layer of the preheating spraying device (11) communicated with the cooling condensation tower (1) is arranged on the lower side of the first air inlet (3).
4. The heat recovery and reuse system of wet desulphurization tail gas according to any one of claims 1 to 3, characterized in that a demister (5) is fixedly installed on the cooling and condensing tower (1), and the demister (5) is located at the upper side of the condensation spray device (4) in the vertical direction.
5. The heat recovery and reuse system of wet desulphurization tail gas according to any one of claims 1 to 3, characterized in that a circulating spray device (12) is fixedly installed in the air preheating tower (2), and the circulating spray device (12) is located at the upper side of the preheating spray device (11) in the vertical direction;
and a circulating pipeline (15) is arranged outside the air preheating tower (2), a liquid inlet of the circulating pipeline (15) is communicated with the lower part of the air preheating tower (2), and a liquid outlet of the circulating pipeline (15) is communicated with the circulating spray device (12).
6. The system for recycling heat of wet desulphurization tail gas according to any one of claims 1-3, characterized in that a pipeline connected with each spraying layer is provided with a valve and a discharge pump, and the discharge pump is close to the spraying layer communicated with the pipeline, and the valve is far away from the spraying layer communicated with the pipeline.
7. The heat recovery and reuse system for the wet desulphurization tail gas according to any one of claims 1 to 3, characterized in that the lower part of the air preheating tower (2) is further communicated with an external discharge pipeline (16).
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| CN113958963A (en) * | 2021-11-30 | 2022-01-21 | 北京清新环境技术股份有限公司 | Heat recovery and reutilization system and method for wet desulphurization tail gas |
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| CN113958963A (en) * | 2021-11-30 | 2022-01-21 | 北京清新环境技术股份有限公司 | Heat recovery and reutilization system and method for wet desulphurization tail gas |
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