Flue gas white smoke eliminating device

Abstract

The utility model provides a white smoke eliminating device. The flue gas white smoke eliminating device comprises a barrel and an air inlet pipe. A smoke channel is formed in the cylinder, the air inlet pipe extends into the cylinder, at least two air outlet holes are formed in a pipe body of the air inlet pipe located in the cylinder, an air channel is formed in the air inlet pipe, and the air channel is communicated with the smoke channel through the air outlet holes. According to the flue gas white smoke eliminating device, the heated air is introduced into the flue gas channel through the plurality of air outlet holes, so that the heated air and the flue gas can be more uniformly mixed. And the air inlet pipe occupies a certain volume in the cylinder body, so that the flowing speed of the flue gas is high, and the heat exchange efficiency of the flue gas and the heated air is improved. Through sufficient mixing of heated air and flue gas, expected heating and mixing effects can be achieved without too high temperature and excessive air.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, and more particularly to a flue gas whitening device. Background Art

[0002] Wet desulfurization is widely used on large ships. After the flue gas passes through the spray layer of the scrubber, the sulfides contained in it will be absorbed by absorbents such as alkali solution or seawater, but at the same time, the desulfurized flue gas will carry a large amount of water vapor. After the flue gas continues to pass through the demister, most of the water droplets will be filtered out, but the saturated water vapor in it cannot be filtered. When the flue gas is discharged from the exhaust port, since the flue gas temperature is usually higher than the external air temperature, the saturated water vapor in the flue gas will condense into small water droplets when encountering the cold air in the external environment, forming white smoke rain, which not only causes visual pollution, but also easily corrodes the hull when the small water droplets fall on the hull. This phenomenon is particularly obvious in cold areas.

[0003] Existing technologies achieve flue gas decolorization by heating and mixing flue gas with heated air to reduce its moisture content and simultaneously increase its temperature. However, due to the uneven mixing of flue gas and heated air, a large amount of heated air is required to achieve flue gas decolorization, resulting in larger fans and heating devices and high energy consumption.

[0004] Therefore, it is necessary to provide a flue gas whitening device to at least partially solve the above problems. Utility Model Content

[0005] The Summary of the Utility Model introduces a series of simplified concepts that will be further described in the Detailed Description of the Utility Model. The Summary of the Utility Model of the Utility Model does not intend to limit the key features and essential technical features of the claimed technical solution, nor does it intend to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problems, the present invention provides a smoke whitening device, comprising:

[0007] A cylinder, wherein a smoke passage is formed in the cylinder; and

[0008] An air intake pipe extends to the interior of the cylinder, and the tube body of the air intake pipe located in the cylinder is provided with at least two air outlet holes, an air channel is formed in the air intake pipe, and the air channel is connected to the smoke channel through the air outlet holes.

[0009] The smoke whitening device of this invention introduces heated air into the smoke passage through multiple air outlets, achieving more uniform mixing of the heated air and smoke. The air inlet duct occupies a significant volume within the cylinder, accelerating smoke flow and improving the heat exchange efficiency between the smoke and heated air. By fully mixing the heated air and smoke, the desired heating and mixing effects can be achieved without excessive temperatures or excess air.

[0010] Optionally, the cylinder extends along a first direction, and the air intake pipe extends along a second direction, and the first direction is different from the second direction.

[0011] Optionally, the air inlet end of the air inlet pipe is higher than the air outlet end; wherein,

[0012] The angle between the first direction and the second direction is 83°-87°; and / or

[0013] The air intake pipe is inserted from the side of the cylinder.

[0014] Optionally, the central axis of the cylinder extends through the air intake pipe.

[0015] Optionally, the air inlet pipe includes a pipe body with two open ends, and the air outlet includes a first air outlet, which is opened on the pipe wall of the pipe body.

[0016] Optionally, the two groups of the first air outlet holes are symmetrically arranged with the central axis of the tube body as the symmetry axis; and / or

[0017] The center point of the first air outlet is located at or above a first plane, the first plane is parallel to the second direction and the third direction, and passes through the central axis of the air intake pipe, and the third direction is perpendicular to the first direction and the second direction.

[0018] Optionally, the air inlet pipe includes a pipe body and an end plate, the air outlet end of the pipe body extends to the smoke channel, and the end plate is arranged at the air outlet end of the pipe body;

[0019] The air outlet includes a first air outlet and a second air outlet. The first air outlet is opened on the tube wall of the tube body, and the second air outlet is opened on the end plate.

[0020] Optionally, the two groups of the first air outlet holes are symmetrically arranged with the central axis of the tube body as the symmetry axis; and / or

[0021] The center point of the first air outlet is located at or above a first plane, the first plane is parallel to the second direction and the third direction and passes through the central axis of the air intake pipe, and the third direction is perpendicular to the first direction and the second direction; and / or

[0022] The two groups of the second air outlet holes are symmetrically arranged with the central axis of the tube body as the symmetry axis; and / or

[0023] The center point of the second air outlet is located on a first plane, the first plane is parallel to the second direction and the third direction and passes through the central axis of the air intake pipe, and the third direction is perpendicular to the first direction and the second direction.

[0024] Optionally, a drainage hole is provided at the lowest end of the junction between the tube body and the end plate, and the drainage hole connects the smoke channel and the air channel.

[0025] Optionally, a smoke exhaust pipe is provided above the cylinder; wherein,

[0026] The length of the exhaust pipe is not less than 2 meters; and / or

[0027] A heat-insulating layer is arranged outside the smoke exhaust pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following drawings of the embodiments of the present invention are used as part of the present invention to understand the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the principles of the present invention. In the drawings,

[0029] Figure 1 This is a schematic structural diagram of a flue gas whitening device according to a preferred embodiment of the present invention;

[0030] Figure 2 This is a three-dimensional schematic diagram of an air intake pipe according to a preferred embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the temperature field simulation of Comparative Example 1;

[0032] Figure 4 This is a schematic diagram of the temperature field simulation of Example 1;

[0033] Figure 5 Schematic diagram of temperature field simulation of Example 2.

[0034] Description of Reference Numerals

[0035] 1: Cylinder

[0036] 101: Flue gas duct

[0037] 11: Flue gas inlet flange

[0038] 12: Flue gas outlet flange

[0039] 2: Air intake pipe

[0040] 201: Air channel

[0041] 202: First vent

[0042] 203: Second vent

[0043] 204: Drainage hole

[0044] 21: Tube body

[0045] 22: End plate

[0046] 23: Air inlet flange

[0047] 3: Exhaust pipe

[0048] 31: Insulation layer

[0049] D1: First direction

[0050] D2: Second direction

[0051] D3: Third direction DETAILED DESCRIPTION

[0052] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without one or more of these details. In other instances, certain technical features known in the art are not described to avoid confusion with embodiments of the present invention.

[0053] In this document, ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component".

[0054] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0055] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0056] Unless otherwise stated, numerical ranges herein include not only the entire range between its two endpoints but also the several sub-ranges contained therein.

[0057] Now, exemplary embodiments according to the present invention will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art.

[0058] Reference Figure 1 The utility model provides a smoke whitening device. The smoke whitening device includes a cylinder 1 and an air inlet pipe 2.

[0059] A flue gas passage 101 is formed within the cylinder 1. The cylinder 1 is a cylindrical structure with openings at both ends. Flue gas can enter from one end, pass through the flue gas passage 101 within the cylinder 1, and be discharged from the other end. Optionally, a flue gas inlet flange 11 is provided at one end of the cylinder 1, and a flue gas outlet flange 12 is provided at the other end. This allows for more flexible connections between the cylinder 1 and other equipment, while ensuring a good seal.

[0060] The air intake pipe 2 extends into the interior of the cylinder 1 and is in communication with the cylinder 1. The air intake pipe 2 is used to transport heated air into the flue gas passage 101, allowing the heated air to mix with the flue gas. Optionally, the air intake pipe 2 is connected to the cylinder 1 using a well-sealed connection method, such as welding or flange connection, to prevent leakage between the heated air and the flue gas. Optionally, an air inlet flange 23 is provided at the inlet end of the air intake pipe 2, making the connection between the air intake pipe 2 and other equipment more flexible and ensuring a good seal.

[0061] Reference Figure 2An air channel 201 is formed within the air intake pipe 2 and communicates with the smoke channel 101. Specifically, the air intake pipe 2, located within the cylinder 1, is provided with at least two air outlets, through which the air channel 201 communicates with the smoke channel 101. Introducing heated air into the smoke channel 101 through multiple air outlets allows for more uniform mixing of the heated air and smoke. Compared to a single outlet, multiple air outlets reduce the formation of localized high-temperature areas, resulting in a more uniform temperature distribution throughout the smoke channel 101, thereby improving mixing efficiency. The air intake pipe 2 occupies a certain volume within the cylinder 1. At the cross-section where the air intake pipe 2 is located, the cross-sectional area for smoke flow is reduced, resulting in faster smoke flow and lower pressure. This further promotes mixing of smoke and air, improves mixing uniformity, and significantly increases the heat exchange efficiency between the smoke and heated air. Consequently, less heated air is required to achieve the desired temperature and humidity for the mixed smoke, eliminating white smoke rain. Furthermore, due to the thorough mixing of the heated air and flue gas, the desired heating and mixing effects can be achieved without excessive temperatures or excess air. Therefore, the total amount and temperature of the heated air can be reduced to achieve the same mixing effect, thereby reducing energy consumption.

[0062] In some embodiments of the present invention, the barrel 1 extends along a first direction D1, and the air intake pipe 2 extends along a second direction D2, where the first direction D1 and the second direction D2 are different. That is, an inclination angle is formed between the air intake pipe 2 and the barrel 1, allowing the heated air to be injected into the flue gas passage 101 at a certain angle, promoting turbulent mixing of the flue gas and heated air, thereby improving the mixing effect, increasing heat exchange efficiency, and reducing system energy consumption.

[0063] In some embodiments of the present invention, the air inlet end of the air inlet pipe 2 is higher than the air outlet end. The setting of the air inlet end higher than the air outlet end helps to form a certain air flow pressure difference, so that the heated air can enter the cylinder 1 more smoothly and mix with the smoke.

[0064] Optionally, the angle between the first direction D1 and the second direction D2 is 83°-87°. By setting this angle, the air intake angle and speed can be further adjusted to optimize the mixing effect, so that the heated air can be more evenly distributed in the smoke channel 101.

[0065] Optionally, the air intake pipe 2 is inserted from the side of the cylinder 1. Compared with directly taking in air from the top or bottom of the cylinder 1, there is no need to overcome a large pressure difference or overcome the effect of gravity.

[0066] In some embodiments of the present invention, the central axis of the cylinder 1 extends through the air intake pipe 2. That is, the horizontal projection of the air intake pipe 2 within the cylinder 1 is greater than the inner radius of the cylinder 1. This allows the air intake pipe 2 to be inserted deeper into the cylinder 1. The deeper insertion of the air intake pipe 2 ensures that the mixing of the smoke entering the cylinder 1 is not limited to the edge area of ​​the cylinder 1, but also includes the central area of ​​the cylinder 1, thereby enhancing the mixing effect.

[0067] As can be seen from the above, the air inlet pipe 2 has at least two air outlets.

[0068] In some embodiments of the present invention, the air intake pipe 2 includes a pipe body 21 with two open ends, and the air outlet includes a first air outlet 202, which is provided in the wall of the pipe body 21. Optionally, multiple first air outlets are provided in the wall of the pipe body 21 along the circumferential direction or the axial direction.

[0069] Optionally, the two groups of first air outlet holes 202 are symmetrically arranged with the central axis of the tube body 21 as the axis of symmetry. Each group of first air outlet holes 202 includes one or more first air outlet holes. Exemplarily, each group of first air outlet holes 202 includes two first air outlet holes. The two first air outlet holes 202 in each group are arranged along the axial direction of the air intake pipe 2. The two groups of first air outlet holes 202 are arranged circumferentially and symmetrically with the central axis of the tube body 21 as the axis of symmetry.

[0070] Optionally, the center point of the first air outlet 202 is located at or above the first plane. The first plane is parallel to the second direction D2 and the third direction D3 and passes through the central axis of the air inlet pipe 2. The third direction D3 is perpendicular to the first direction D1 and the second direction D2. That is, the first air outlet 202 is located in the upper half of the tube body 21, reducing convection between the air discharged from the first air outlet 202 and the smoke, thereby avoiding affecting the exhaust flow rate of the smoke. Preferably, the center point of the first air outlet 202 is located at the first plane. The provision of the first air outlet 202 enables more complete mixing with the smoke, and more complete heat exchange between the air and the smoke.

[0071] In some further embodiments of the present invention, the air inlet pipe 2 further includes an end plate 22. The outlet end of the pipe body 21 extends to the smoke passage 101, and the end plate 22 is disposed at the outlet end of the pipe body 21. The outlet holes include a first outlet hole 202 and a second outlet hole 203. The first outlet hole 202 is formed in the wall of the pipe body 21, and the second outlet hole 203 is formed in the end plate 22.

[0072] The configuration of the first air outlet 202 is the same as that in the above embodiment, and will not be described again for the sake of brevity.

[0073] The two groups of second air outlet holes 203 are symmetrically arranged about the central axis of the tube body 21. This arrangement of the second air outlet holes 203 ensures uniform mixing of air and smoke, minimizing energy loss. For example, six air outlet holes are provided, with each group of two first air outlet holes 202 and one second air outlet hole 203. The two first air outlet holes 202 in each group are arranged axially along the air intake pipe 2. The two groups of first air outlet holes 202 are circumferentially arranged symmetrically about the central axis of the tube body 21.

[0074] Optionally, the center point of the second air outlet 203 is located on the first plane. Optionally, the plane where the center points of the first air outlet 202 and the second air outlet 203 are located is coplanar with the first plane.

[0075] In the above embodiment, the air outlets are preferably arranged symmetrically with the second plane serving as the plane of symmetry. The second plane is parallel to the first direction D1 and the second direction D2 and passes through the central axis of the air inlet pipe 2. This symmetrical arrangement ensures that the air is evenly distributed within the smoke passage 101 and mixed with the smoke. Uniform airflow distribution helps improve heat exchange efficiency. When the cold and hot air flows evenly contact each other, the heat exchange process is more complete and efficient.

[0076] When heated air enters the cylinder 1 through the air intake pipe, condensation may form inside the pipe due to temperature differences. As previously mentioned, the air intake pipe 2 is tilted. In some embodiments of the present invention, a drainage hole 204 is provided at the lowest end of the junction between the pipe body 21 and the end plate 22. The drainage hole 204 connects the flue gas passage 101 with the air passage 201. The tilted air intake pipe 2 utilizes gravity to allow condensation to naturally flow to the lowest end, preventing condensation from accumulating inside the pipe, thereby ensuring stable system operation and continuous production.

[0077] In some embodiments of the present invention, a smoke exhaust pipe 3 is provided above the cylinder 1. The provision of the smoke exhaust pipe 3 extends the mixing path of smoke and air.

[0078] Optionally, the length of the smoke exhaust pipe 3 is not less than 2 meters. Reasonable length of the smoke exhaust pipe 3 can ensure that the smoke and heated air are fully mixed, ensure the safety and effectiveness of the smoke exhaust system, and achieve overall optimization and efficient operation of the smoke exhaust system.

[0079] Optionally, a heat-insulating layer 31 is provided outside the smoke exhaust pipe 3 .

[0080] The flue gas desulfurization mixing device provided by the utility model has a simple structure, is easy to install, has a small mass, does not require additional support, and requires very little space. When connected behind the desulfurization tower, the space occupied by the device is almost equivalent to that of the exhaust pipe 3.

[0081] The following uses the Fluent tool to simulate the flue gas temperature uniformity of the flue gas decolorization mixing device of the comparative example and the embodiment in turn. The flue gas parameters of a ship diesel engine at 35% load are used as the design working conditions.

[0082] Comparative Example 1

[0083] The air inlet pipe 2 does not extend into the cylinder 1 , and the heated air is directly introduced from the side wall of the cylinder 1 .

[0084] Flue gas flow rate: 131600kg / h; flue gas temperature: 20℃; flue gas relative humidity: 100%.

[0085] Heating air flow rate: 10000kg / h, temperature: 80℃.

[0086] Ambient temperature outside the smoke exhaust port: 1°C. Ambient relative humidity: 86%.

[0087] According to this working condition, the white smoke plume can be eliminated when the outlet temperature of the mixed flue gas reaches 24.2℃.

[0088] like Figure 3 As shown in FIG, the portion of the mixed gas with a temperature higher than 24.2°C only occupies 4% of the outlet area.

[0089] Example 1

[0090] The air inlet pipe 2 extends into the cylinder 1. The air inlet pipe 2 is provided with an air outlet, and the heated air is passed into the cylinder 1 from the air outlet. The air inlet pipe 2 is provided with six air outlets, including four first air outlets 202 and two second air outlets 203.

[0091] Flue gas flow rate: 131600kg / h; flue gas temperature: 20℃; flue gas relative humidity: 100%.

[0092] Heating air flow rate: 10000kg / h, temperature: 80℃.

[0093] Ambient temperature outside the smoke exhaust port: 1°C. Ambient relative humidity: 86%.

[0094] According to this working condition, the white smoke plume can be eliminated when the outlet temperature of the mixed flue gas reaches 24.2℃.

[0095] like Figure 4 As shown, the area where the outlet flue gas temperature is higher than 24.2℃ accounts for 62%.

[0096] Example 2

[0097] The heating air flow rate increases to 18000kg / h. Figure 5As shown in the figure, the area where the outlet flue gas temperature is higher than 24.2℃ reaches 90%, and the temperature of most of the outlet flue gas meets the requirements, which can achieve the purpose of eliminating white smoke rain.

[0098] For parts not introduced in Example 2, refer to the description in Example 1.

[0099] It can be seen from the above comparative examples and embodiments that extending the air inlet pipe 2 into the cylinder 1 can greatly improve the uniformity of mixing of flue gas and heated air, improve heat exchange efficiency, and use a small amount of heated air for mixing to meet the demand of eliminating white smoke and rain.

[0100] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "setting" appearing in this article can mean that one component is directly attached to another component, or that one component is attached to another component through an intermediate component. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise stated.

[0101] The present invention has been described through the above embodiments, but it should be understood that the above embodiments are for illustrative and illustrative purposes only and are not intended to limit the present invention to the described embodiments. Those skilled in the art will appreciate that many more variations and modifications may be made based on the teachings of the present invention, and all of these variations and modifications fall within the scope of protection claimed by the present invention.

Claims

1. A flue gas whitening device, characterized in that: include: a cylinder, wherein a smoke passage is formed in the cylinder; as well as An air intake pipe extends to the interior of the cylinder, and the tube body of the air intake pipe located in the cylinder is provided with at least two air outlet holes, an air channel is formed in the air intake pipe, and the air channel is connected to the smoke channel through the air outlet holes.

2. The flue gas whitening device according to claim 1, characterized in that: The cylinder extends along a first direction, and the air intake pipe extends along a second direction, and the first direction is different from the second direction.

3. The flue gas whitening device according to claim 2, characterized in that: The air inlet end of the air inlet pipe is higher than the air outlet end; wherein, The angle between the first direction and the second direction is 83°-87°; and / or The air intake pipe is inserted from the side of the cylinder.

4. The flue gas whitening device according to claim 1, characterized in that: The central axis of the cylinder extends through the air intake pipe.

5. The flue gas whitening device according to any one of claims 1 to 4, characterized in that: The air inlet pipe includes a pipe body with two open ends, and the air outlet includes a first air outlet, which is opened on the pipe wall of the pipe body.

6. The flue gas whitening device according to claim 5, characterized in that: The two groups of the first air outlet holes are symmetrically arranged with the central axis of the tube body as the symmetry axis; and / or The center point of the first air outlet is located at or above a first plane, the first plane is parallel to the second direction and the third direction, and passes through the central axis of the air intake pipe, and the third direction is perpendicular to the first direction and the second direction.

7. The flue gas whitening device according to any one of claims 1 to 4, characterized in that: The air inlet pipe includes a pipe body and an end plate, the air outlet end of the pipe body extends to the smoke channel, and the end plate is arranged at the air outlet end of the pipe body; The air outlet includes a first air outlet and a second air outlet. The first air outlet is opened on the tube wall of the tube body, and the second air outlet is opened on the end plate.

8. The flue gas whitening device according to claim 7, characterized in that: The two groups of the first air outlet holes are symmetrically arranged with the central axis of the tube body as the symmetry axis; and / or The center point of the first air outlet is located at or above a first plane, the first plane is parallel to the second direction and the third direction and passes through the central axis of the air intake pipe, and the third direction is perpendicular to the first direction and the second direction; and / or The two groups of the second air outlet holes are symmetrically arranged with the central axis of the tube body as the symmetry axis; and / or The center point of the second air outlet is located on a first plane, the first plane is parallel to the second direction and the third direction and passes through the central axis of the air intake pipe, and the third direction is perpendicular to the first direction and the second direction.

9. The flue gas whitening device according to claim 7, characterized in that: A drainage hole is provided at the lowest end of the junction between the tube body and the end plate, and the drainage hole communicates with the smoke channel and the air channel.

10. The flue gas whitening device according to claim 1, characterized in that: A smoke exhaust pipe is provided above the cylinder; wherein, The length of the exhaust pipe is not less than 2 meters; and / or A heat-insulating layer is provided outside the smoke exhaust pipe.

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