A kind of demisting device for reducing desulfurization tower droplets

Abstract

The utility model discloses a kind of demisting device for reducing desulfurization tower mist drop, comprising: primary demisting layer, including several column pipe mist eliminators, several column pipe mist eliminators are laid flat and along the radial arrangement of desulfurization tower;Secondary demisting layer, secondary demisting layer is located above primary demisting layer, and including upper spray washing mechanism, lower spray washing mechanism, several ridge mist eliminators;Several ridge mist eliminators are along the radial arrangement of desulfurization tower;Upper spray washing mechanism is located below ridge mist eliminator;Lower spray washing mechanism is located above ridge mist eliminator;Three demisting layer, three demisting layer is located above secondary demisting layer, and including inner spray washing mechanism, several tube bundle mist eliminators, several tube bundle mist eliminators are vertical and divergent arrangement, and inner spray washing mechanism includes the spray head assembly into each tube bundle mist eliminator.The utility model has the advantages of multiple path, continuously change flue gas movement direction, high-efficiency capture mist drop, flue gas emission concentration stable.

Description

Technical Field

[0001] This application relates to the field of desulfurization tower demisting technology, specifically to a demisting device for reducing mist droplets in desulfurization towers. Background Technology

[0002] A desulfurization tower is a tower-type device used to desulfurize industrial waste gas. The flue gas after desulfurization contains water mist, sulfuric acid droplets, calcium sulfate and calcium sulfite droplets. If demisting is not performed, these droplets will cause serious corrosion and scaling to downstream equipment such as flue gas heaters, induced draft fans, and flues. It may also cause vibration of the induced draft fan, affecting the normal operation and service life of the equipment.

[0003] Existing desulfurization towers typically use two layers of flat plate demisters for demisting, resulting in a single flow path, poor demisting effect, unstable particulate matter emissions from the desulfurization tower outlet, and flue gas dust concentration ≤30mg / Nm3. In addition, since the temperature of the clean flue gas emitted from the absorption tower is below 55 degrees Celsius, while the flue gas velocity is too high during the demisting process, dust and micro-particle gypsum slurry adhering to the flue can still be carried into the clean flue gas and discharged into the atmosphere through the chimney. This results in gypsum rain phenomenon as the flue gas carries the slurry out. Utility Model Content

[0004] Therefore, there is a need to provide a demisting device to reduce mist droplets in desulfurization towers, in order to solve the problems in the existing technology where the demisting flow path is single and the flow rate is too fast, resulting in poor demisting effect, unstable dust emission concentration at the desulfurization tower outlet, and clean flue gas drifting out with the paddle.

[0005] To achieve the above objectives, the inventors have provided a demisting device for reducing mist droplets in a desulfurization tower, comprising:

[0006] The primary demister layer includes several tube demisters, which are laid flat and arranged along one radial direction of the desulfurization tower.

[0007] A secondary demisting layer is provided above the primary demisting layer and includes an upper spray flushing mechanism, a lower spray flushing mechanism, and several ridge demisters; the several ridge demisters are arranged radially along one side of the desulfurization tower; the upper spray flushing mechanism is located below the ridge demisters and the flushing direction is upward; the lower spray flushing mechanism is located above the ridge demisters and the flushing direction is downward.

[0008] The third-level demisting layer is located above the second-level demisting layer and includes an internal spray flushing mechanism and several tube bundle demisters. The tube bundle demisters are placed vertically and arranged in a divergent manner. The internal spray flushing mechanism includes nozzle assemblies that penetrate into each tube bundle demister.

[0009] In some embodiments, the tube bundle demister includes a tube body and several layers of blades, with an outlet at the top of the tube body and an inlet at the bottom of the tube body; the several layers of blades are arranged sequentially from bottom to top along the axial direction of the tube body.

[0010] In some embodiments, the nozzle assembly includes a plurality of nozzles, the number of nozzles being the same as the number of blades, and each nozzle being disposed at a different layer of blades.

[0011] In some embodiments, the primary demisting layer has at least two layers, with each primary demisting layer arranged from bottom to top below the secondary demisting layer.

[0012] In some embodiments, the tube demisters of each primary demister layer are arranged in different radial directions relative to the desulfurization tower.

[0013] In some embodiments, it also includes:

[0014] A spray layer is located below the primary demisting layer; the spray layer includes several spray pipes, each spray pipe having several spray heads, with the spray heads facing downwards.

[0015] In some embodiments, the spray layer has several layers, which are arranged from bottom to top below the primary demisting layer, and the spray heads of each spray layer are staggered.

[0016] In some embodiments, it also includes:

[0017] A tray, which is located below the spray layer.

[0018] In some embodiments, both the upward spray rinsing mechanism and the downward spray rinsing mechanism include a plurality of rinsing pipes, each rinsing pipe being provided with a plurality of rinsing nozzles, with the rinsing nozzles of the upward spray rinsing mechanism facing upwards and the rinsing nozzles of the downward spray rinsing mechanism facing downwards.

[0019] In some embodiments, the internal spray flushing mechanism includes a plurality of flushing pipes, which are connected to each nozzle assembly via a plurality of hoses.

[0020] Unlike existing technologies, the demister device for reducing mist droplets in the desulfurization tower described in the above technical solution demistes the flue gas sequentially through a primary demister layer, a secondary demister layer, and a tertiary demister layer. The primary demister layer includes several tube demisters arranged horizontally along one radial direction of the desulfurization tower. The flue gas passes vertically through the tube demisters, thus performing a primary mist collection operation. The secondary demister layer is located above the primary demister layer. Several ridge demisters in the secondary demister layer are arranged along one radial direction of the desulfurization tower, performing a secondary mist collection operation. The direction of flue gas movement is changed by the ridge demisters, accelerating the agglomeration of mist droplets into liquid droplets, which then flow along the blades of the ridge demisters. The airflow flows down at a certain angle to the airflow direction, making it suitable for higher air velocity conditions. It is stable and reliable, maintaining good demisting effect even in high-speed airflow, while reducing gas pressure drop and improving airflow distribution. The droplets are washed away by the upper and lower spray flushing mechanisms to avoid clogging. The third-stage demisting layer is located above the second-stage demisting layer. Several tube bundle demisters in the third-stage demisting layer are placed vertically and arranged in a divergent manner. The flue gas is diverted by several tube bundle demisters and collides with the inside of the tube bundle demisters multiple times, changing direction again, and performing three mist collection operations. The droplets are washed away by the nozzle assembly that penetrates into each tube bundle demister to avoid clogging. Therefore, the demister device for reducing mist droplets in the desulfurization tower can continuously change the direction of flue gas movement through multiple paths, reduce its speed, and achieve multiple inertial impacts, thus capturing mist droplets more efficiently and realizing gas-liquid separation. The flue gas can be discharged after meeting emission standards. In actual operation, when flushing the demister, the dust at the desulfurization tower outlet steadily decreases to within 10 mg / Nm3, and no gypsum rain occurs. The droplets after demistering are less than 25 μm, which can adapt to fluctuations in flue gas load within the range of 30-110% without affecting emission standards.

[0021] The above description of the utility model is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0022] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of this application and other related content, and should not be considered as limitations on this application.

[0023] In the accompanying drawings of the instruction manual:

[0024] Figure 1 This is a structural diagram of the demister for reducing mist droplets in the desulfurization tower, as described in a specific embodiment.

[0025] Figure 2This is a top view of the primary demisting layer described in the specific implementation method;

[0026] Figure 3 This is a top view of the three-stage demisting layer described in the specific implementation method;

[0027] Figure 4 This is a diagram illustrating the internal structure of the tube bundle demister described in a specific embodiment.

[0028] Figure 5 This is a structural diagram of another embodiment of the demisting device for reducing mist droplets in a desulfurization tower;

[0029] The reference numerals used in the above figures are explained as follows:

[0030] 1. Tube-type demister;

[0031] 2. Top spray flushing mechanism;

[0032] 3. Downward spray flushing mechanism;

[0033] 4. Roof demister;

[0034] 5. Internal spray flushing mechanism;

[0035] 500, spray nozzle;

[0036] 6. Tube bundle demister;

[0037] 600. Pipe body;

[0038] 6000, Exports;

[0039] 6001, Imported;

[0040] 601. Blade;

[0041] 7. Spray pipe;

[0042] 700. Spray head;

[0043] 8. Pallet;

[0044] 9. Desulfurization tower. Detailed Implementation

[0045] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0046] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0047] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0048] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0049] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0050] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0051] As understood in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0052] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0053] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0054] A desulfurization tower is a tower-type device used to desulfurize industrial waste gas. The flue gas after desulfurization contains water mist, sulfuric acid droplets, calcium sulfate and calcium sulfite droplets. If demisting is not performed, these droplets will cause serious corrosion and scaling to downstream equipment such as flue gas heaters, induced draft fans, and flues. It may also cause vibration of the induced draft fan, affecting the normal operation and service life of the equipment.

[0055] Existing desulfurization towers typically use two layers of flat plate demisters for demisting, resulting in a single flow path, poor demisting effect, unstable particulate matter emissions from the desulfurization tower outlet, and flue gas dust concentration ≤30mg / Nm3. In addition, since the temperature of the clean flue gas emitted from the absorption tower is below 55 degrees Celsius, while the flue gas velocity is too high during the demisting process, dust and micro-particle gypsum slurry adhering to the flue can still be carried into the clean flue gas and discharged into the atmosphere through the chimney. This results in gypsum rain phenomenon as the flue gas carries the slurry out.

[0056] Therefore, this utility model provides a demisting device to reduce mist droplets in desulfurization towers. It is used to capture mist droplets in flue gas inside the desulfurization tower, reduce the amount of mist droplets carried by the flue gas, and especially can change the flue gas flow path and direction multiple times, which is more efficient and reduces the flow speed to ensure that the emission concentration is stable and meets the standards, and reduces the probability of gypsum rain.

[0057] Please see Figure 1In a specific embodiment, the demisting device for reducing mist droplets in the desulfurization tower includes a primary demisting layer, a secondary demisting layer, and a tertiary demisting layer. The primary demisting layer, the secondary demisting layer, and the tertiary demisting layer are arranged sequentially from bottom to top inside the desulfurization tower 9 to capture mist droplets in sequence.

[0058] Please see Figure 2 The primary demister layer includes several tube demisters 1, which are laid flat and arranged radially along the desulfurization tower 9. This arrangement minimizes the space occupied by the existing desulfurization tower in terms of height, saving more space for the secondary and tertiary demister layers. The secondary demister layer is located above the primary demister layer and includes an upper spray flushing mechanism 2, a lower spray flushing mechanism 3, and several ridge demisters 4. The ridge demisters 4 are arranged radially along the desulfurization tower 9. The upper spray flushing mechanism 2 is located below the ridge demisters 4, with the flushing direction upwards. The lower spray flushing mechanism 3 is located above the ridge demisters 4, with the flushing direction downwards. The tertiary demister layer is located above the secondary demister layer and includes an internal spray flushing mechanism 5 and several tube bundle demisters 6. Please refer to [link to relevant documentation]. Figure 1 and Figure 3 Several tube bundle demisters 6 are placed vertically and arranged in a radiating pattern to cover the horizontal plane at the height of the desulfurization tower 9. The internal spray flushing mechanism 5 includes a nozzle assembly that penetrates into each tube bundle demister 6.

[0059] The demisting device for reducing mist droplets in the desulfurization tower demistates the flue gas sequentially through a primary demisting layer, a secondary demisting layer, and a tertiary demisting layer. The primary demisting layer performs demisting operations before the secondary demisting layer. The primary demisting layer includes several tube demisters 1, which are placed horizontally and arranged radially along the desulfurization tower 9. The flue gas passes through the tube demisters 1 vertically, thereby performing a mist collection operation.

[0060] The secondary demister layer is located above the primary demister layer and performs demistering operations before the tertiary demister layer. Several ridge demisters 4 in the secondary demister layer are arranged radially along the desulfurization tower 9 to perform secondary mist collection. The blades 601 of the ridge demister 4 are inclined, and the direction of flue gas movement is changed by the ridge demister 4, accelerating the mist to gather into droplets, which then flow down along the blades 601 of the ridge demister 4. The direction of the flow down is at a certain angle to the direction of airflow, which can be used for working conditions with higher gas velocities. It is stable and reliable, and still maintains a good demistering effect in high-speed airflow. At the same time, it reduces the gas pressure drop and improves the airflow distribution. The upper spray flushing mechanism 2 and the lower spray flushing mechanism 3 can respectively flush the upper and lower surfaces of the ridge demister 4 to wash away the droplets and avoid clogging.

[0061] The third-stage demister layer is located above the second-stage demister layer. Several tube bundle demisters 6 in the third-stage demister layer are placed vertically and arranged in a divergent manner. The tube bundle demisters 6 are tubular and have a certain height. The flue gas is diverted by several tube bundle demisters 6 and collides with the inside of the tube bundle demisters 6 multiple times and changes direction again, performing three mist collection operations. The mist droplets are flushed away by the nozzle assembly that penetrates into each tube bundle demister 6, so as to flush the inside of each tube bundle demister 6 and avoid clogging.

[0062] Therefore, under the same height desulfurization tower 9 conditions, demisting can be achieved through three different demisting paths via a primary, secondary, and tertiary demisting layer. This allows for multi-path, continuous changes in the direction of flue gas movement, reducing its speed, and multiple inertial impacts, resulting in more efficient droplet capture and gas-liquid separation. The flue gas can then be emitted after meeting emission standards. In actual operation, when flushing the demister, the dust concentration at the outlet of desulfurization tower 9 stably decreased to within 10 mg / Nm3, with no gypsum rain observed. The droplets after demisting are less than 25 μm, and the system can adapt to flue gas load fluctuations within the range of 30-110%, without affecting emission standards.

[0063] In some embodiments, the tube bundle demister 6 includes a tube body 600 and several layers of blades 601. The top of the tube body 600 is provided with an outlet 6000. The tube body 600 has a certain height, and the inside of the tube body 600 is a channel for flue gas movement. The bottom of the tube body 600 is provided with an inlet 6001. The inlet 6001 of the tube body 600 faces downward. The flue gas enters the interior of the tube body 600 from the inlet 6001 and then exits from the outlet 6000. Several layers of blades 601 are arranged sequentially from bottom to top along the axial direction of the tube body 600. The flue gas entering the tube body 600 passes through each layer of blades 601 in sequence and collides with the multiple layers of blades 601 multiple times.

[0064] Please see Figure 4 In a further embodiment, the blades 601 are spirally coiled around the inner wall of the tube body 600, and several layers of blades 601 are arranged sequentially along the circumference of the tube body 600. When the flue gas enters the tube body 600, it collides with the multiple layers of blades 601 in sequence, and the collision direction is changed at each layer of blades 601. The flue gas movement direction is changed continuously through multiple paths, reducing the speed to a certain extent. Multiple inertial collisions are performed to capture droplets more efficiently, achieve gas-liquid separation efficiently, and the flue gas can be discharged after stably meeting the standards.

[0065] In some embodiments, the nozzle assembly includes a plurality of nozzles 500, the number of nozzles 500 being the same as the number of blades 601, and each nozzle 500 being disposed at each layer of blades 601, thereby enabling individual rinsing of each layer of blades 601.

[0066] In some embodiments, the blade 601 is provided with six blades, that is, the nozzle 500 assembly includes six nozzles 500, each nozzle 500 rinsing one blade 601 respectively.

[0067] In some embodiments, the internal spray flushing mechanism 5 includes a plurality of flushing pipes, which are connected to each nozzle assembly via a plurality of hoses to deliver flushing water to the nozzle 500.

[0068] Please see Figure 1 In some embodiments, the primary demisting layer has at least two layers, with each primary demisting layer arranged from bottom to top below the secondary demisting layer, which can pre-treat a large amount of flue gas multiple times and perform more impact demisting.

[0069] In some embodiments, the tube demisters 1 of each primary demister layer are arranged in different radial directions relative to the desulfurization tower 9.

[0070] Please see Figure 5 In some embodiments, a spray layer is also included, which is located below the primary demister layer. The spray layer includes a plurality of spray pipes 7, each equipped with a plurality of spray heads 700, which face downwards. The flue gas entering the desulfurization tower 9 first comes into contact with the spray liquid to convert the unsaturated flue gas into saturated wet flue gas, which then enters the primary demister layer.

[0071] In some embodiments, the spray layer has several layers, which are arranged from bottom to top below the primary demisting layer, and the spray heads 700 of each spray layer are staggered to each other, which can efficiently pre-treat a large amount of flue gas.

[0072] In some embodiments, a tray 8 is also included, which is disposed below the spray layer. Condensate and washing spray liquid are collected through the tray 8 for other uses or recycled as rinsing water.

[0073] In some embodiments, both the upper spray flushing mechanism 2 and the lower spray flushing mechanism 3 include a plurality of flushing pipes. The flushing pipes are mounted in the desulfurization tower 9 by a support. The flushing pipes are provided with a plurality of flushing nozzles, with the flushing nozzles of the upper spray flushing mechanism 2 facing upward and the flushing nozzles of the lower spray flushing mechanism 3 facing downward.

[0074] In a further embodiment, a water pump is also included, which is used to draw flushing water from the upward spray flushing mechanism 2, the downward spray flushing mechanism 3, and the internal spray flushing mechanism 5, respectively.

[0075] In some embodiments, the upper spray rinsing mechanism 2, the lower spray rinsing mechanism 3, and the inner spray rinsing mechanism 5 can be connected to independent water pumps, with each pump dedicated to its specific function.

[0076] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A demisting device for reducing mist droplets in a desulfurization tower, characterized in that, include: The primary demister layer includes several tube demisters, which are laid flat and arranged along one radial direction of the desulfurization tower. A secondary demisting layer is provided above the primary demisting layer and includes an upper spray flushing mechanism, a lower spray flushing mechanism, and several ridge demisters; the several ridge demisters are arranged radially along one side of the desulfurization tower; the upper spray flushing mechanism is located below the ridge demisters and the flushing direction is upward; the lower spray flushing mechanism is located above the ridge demisters and the flushing direction is downward. The third-level demisting layer is located above the second-level demisting layer and includes an internal spray flushing mechanism and several tube bundle demisters. The tube bundle demisters are placed vertically and arranged in a divergent manner. The internal spray flushing mechanism includes nozzle assemblies that penetrate into each tube bundle demister.

2. The demister for reducing mist droplets in a desulfurization tower according to claim 1, characterized in that, The tube bundle demister includes a tube body and several layers of blades. The top of the tube body has an outlet, and the bottom of the tube body has an inlet. The several layers of blades are arranged sequentially from bottom to top along the axial direction of the tube body.

3. The demister for reducing mist droplets in a desulfurization tower according to claim 2, characterized in that, The nozzle assembly includes a number of nozzles, the number of nozzles being the same as the number of blades, and each nozzle is located at a different layer of blades.

4. The demister for reducing mist droplets in a desulfurization tower according to claim 1, characterized in that, The primary demisting layer has at least two layers, with each primary demisting layer arranged from bottom to top below the secondary demisting layer.

5. The demister for reducing mist droplets in a desulfurization tower according to claim 4, characterized in that, The tube demisters in each first-level demister layer are arranged in different radial directions relative to the desulfurization tower.

6. The demister for reducing mist droplets in a desulfurization tower according to claim 1, characterized in that, Also includes: A spray layer is located below the primary demisting layer; the spray layer includes several spray pipes, each spray pipe having several spray heads, with the spray heads facing downwards.

7. The demister for reducing mist droplets in a desulfurization tower according to claim 6, characterized in that, The spray layer consists of several layers, which are arranged from bottom to top below the primary demisting layer, and the spray heads of each spray layer are staggered.

8. The demister for reducing mist droplets in a desulfurization tower according to claim 6, characterized in that, Also includes: A tray, which is located below the spray layer.

9. The demister for reducing mist droplets in a desulfurization tower according to claim 1, characterized in that, Both the upward spray rinsing mechanism and the downward spray rinsing mechanism include several rinsing pipes, and the rinsing pipes are equipped with several rinsing nozzles. The rinsing nozzles of the upward spray rinsing mechanism face upwards, and the rinsing nozzles of the downward spray rinsing mechanism face downwards.

10. The demister for reducing mist droplets in a desulfurization tower according to claim 1, characterized in that, The internal spray flushing mechanism includes several flushing pipes, which are connected to each nozzle assembly via several flexible hoses.

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