Limestone gypsum wet desulphurization device

Abstract

The invention relates to the technical field of flue gas desulfurization, in particular to a limestone-gypsum wet desulfurization device, which is characterized in that a plurality of spray pipes are annularly arranged in a desulfurization tower, and spray holes are formed along the circumferential surfaces of the spray pipes, so that limestone slurry is horizontally sprayed out, the direct impact of flue gas on the spray holes and the attachment of reactants are effectively avoided, and the desulfurization efficiency is improved. And the blocking risk is reduced. And meanwhile, the horizontally sprayed slurry can clean the surface of the spraying pipe, so that blockage is further prevented. Due to the synchronous lifting and rotating design of the first lifting plate and the stirring blades, the mixing and stirring of slurry with different heights in the desulfurization tower are enhanced, and the stirring efficiency is improved. The second lifting plate and the first lifting plate act synchronously, impurities in the spraying holes are cleaned through a brush, and blockage caused by limestone slurry impurities is avoided. Due to the design, the desulfurization efficiency is improved, the maintenance work is simplified, the maintenance cost is reduced, and the stability and the reliability of the system are enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas desulfurization, and in particular to a limestone gypsum wet desulfurization device. Background Art

[0002] In the flue gas desulfurization process, limestone-gypsum wet desulfurization is the most widely used and most efficient desulfurization technology in thermal power plants. The flue gas is transported upward inside the separation tower, and the limestone slurry is sprayed downward in the vertical direction through the spray pipe. The flue gas and the slurry form mutual impact and chemical reaction. After a long time, the reactants of the slurry and flue gas will adhere to the spray head and affect its spraying effect. In severe cases, the spray head may even be blocked. In addition, during the long-term spraying operation, the impurities contained in the limestone slurry may also cause the spray head to be blocked. These will affect the flue gas desulfurization efficiency; in addition, the dihydrate calcium sulfate formed after the reaction of the flue gas and the slurry is collected at the bottom of the desulfurization tower and is easy to form condensation, and excessive condensation will affect its smooth discharge.

[0003] Based on the above situation, the present invention proposes a limestone gypsum wet desulfurization device, which can clean the spray pipe during the stirring process of the calcium sulfate dihydrate solution to avoid blockage. Summary of the invention

[0004] In view of the above problems existing in the existing limestone gypsum wet desulfurization device, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a limestone gypsum wet desulfurization device, the purpose of which is to achieve cleaning of the spray pipe during the stirring of the calcium sulfate dihydrate solution to avoid blockage.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a limestone gypsum wet desulfurization device, comprising a desulfurization tower for receiving flue gas and limestone slurry for chemical reaction; a limestone slurry spraying component is arranged inside the desulfurization tower, wherein the spraying component includes a slurry storage pipe, a spray pipe located below the slurry storage pipe and a second lifting plate that can be raised and lowered for cleaning the spray pipe; a stirring component is also arranged at the bottom of the desulfurization tower, and the stirring component is used to stir the bottom slurry and the reaction product.

[0007] As a preferred solution of the limestone gypsum wet desulfurization device described in the present invention, the slurry storage pipe is composed of two coaxially arranged annular pipes and a cylindrical pipe arranged in the center, the three are connected in turn through connecting pipes, and a slurry pipe is arranged at the upper end of the cylindrical pipe.

[0008] As a preferred solution of the limestone gypsum wet desulfurization device of the present invention, there are a plurality of spray pipes evenly distributed on the bottom surfaces of the annular pipe and the cylindrical pipe, and a baffle is provided at the lower end of each spray pipe.

[0009] As a preferred solution of the limestone gypsum wet desulfurization device of the present invention, a through hole is opened on the plate surface of the second lifting plate at the position corresponding to each of the spray pipes, and a brush is arranged on the inner wall of the through hole, and a flue gas hole for the flue gas to pass through is also arranged on the second lifting plate.

[0010] As a preferred solution of the limestone gypsum wet desulfurization device of the present invention, the stirring component includes a motor arranged in a sealed cavity at the bottom of the desulfurization tower, the motor shaft of the motor extends upward to the inside of the desulfurization tower and is connected to a threaded rod, and the external thread of the threaded rod is sleeved with a first lifting plate.

[0011] As a preferred solution of the limestone gypsum wet desulfurization device of the present invention, the first lifting plate is symmetrically formed with notches on its periphery, and limiting ribs matching the notches are integrally formed at positions on the inner wall of the desulfurization tower corresponding to the notches.

[0012] As a preferred solution of the limestone gypsum wet desulfurization device of the present invention, a turntable is rotatably mounted on the top of the first lifting plate, and a plurality of stirring blades are distributed in an annular manner on the top of the turntable.

[0013] As a preferred solution of the limestone gypsum wet desulfurization device of the present invention, the top of the threaded rod is fixedly connected to a limit plate, the interior of each stirring plate is hollow, and the cavity of the stirring plate is connected to the limit plate through a connecting rod.

[0014] As a preferred solution of the limestone gypsum wet desulfurization device described in the present invention, the top end of the connecting rod is hingedly connected to the edge of the limit plate, and the bottom end extends to the bottom of the stirring plate cavity and slides with it through an axle pin, and guide grooves are formed on the inner wall of the stirring plate corresponding to the two ends of the axle pin.

[0015] As a preferred solution of the limestone gypsum wet desulfurization device of the present invention, the second lifting plate is connected to the first lifting plate through a plurality of support pipes.

[0016] Beneficial effects of the present invention: Avoiding flue gas impact and reactant adhesion: The present invention arranges a plurality of spray pipes in a ring shape inside the desulfurization tower, and opens spray holes on the circumferential surface of each spray pipe, so that the limestone slurry is sprayed out in a horizontal direction, which effectively avoids the flue gas directly acting on the spray holes to impact them, and at the same time reduces the possibility of the flue gas and slurry reactants adhering to the spray holes.

[0017] Self-cleaning function: Since the slurry is sprayed in the horizontal direction, it not only reacts with the flue gas, but also acts on the surface of the adjacent spray pipe. Even if a small amount of reactants adhere to the spray pipe or spray hole, the attached reactants can be cleaned away by the sprayed slurry, thus avoiding the problem of spray hole being blocked.

[0018] Improve stirring efficiency and action area: During the lifting process, the first lifting plate in the present invention drives several stirring blades to rotate and lift synchronously, so that the slurry at different heights inside the desulfurization tower can be mixed and stirred, which significantly improves the stirring action area and efficiency.

[0019] Synchronous lifting to avoid blockage: The second lifting plate is connected to the first lifting plate through a support pipe, and the two can move synchronously. During the lifting of the first lifting plate, the second lifting plate slides relative to the spray pipe, and the brush inside the through hole can clean the impurities stuck in the spray hole, effectively avoiding the blockage of the spray hole by impurities in the limestone slurry.

[0020] Enhanced desulfurization effect: Through the above design, the present invention can more effectively promote the mixing and reaction of flue gas and limestone slurry, improve the desulfurization efficiency, and reduce the problem of decreased desulfurization efficiency due to blockage of the spray holes.

[0021] Easy maintenance: The design of the present invention simplifies the maintenance work inside the desulfurization tower. Through the automated lifting plate and brush cleaning system, the need for manual cleaning is reduced, and the maintenance cost and labor intensity are reduced.

[0022] Improve system stability: By reducing spray hole blockage and improving stirring efficiency, the present invention improves the stability and reliability of the desulfurization system and reduces downtime caused by equipment failure.

[0023] These beneficial effects work together to make the limestone gypsum wet desulfurization device of the present invention have significant advantages in improving desulfurization efficiency, reducing maintenance costs and improving system stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the structure of the entire desulfurization device in the embodiment;

[0026] Figure 2Schematic diagram of the internal structure of the entire desulfurization device in the embodiment;

[0027] Figure 3 for Figure 2 Schematic diagram of the front view in FIG.

[0028] Figure 4 This is a schematic diagram of the installation of the first lifting plate inside the desulfurization tower in the embodiment;

[0029] Figure 5 Schematic diagram of the distribution of stirring blades on the turntable in the embodiment;

[0030] Figure 6 for Figure 5 A local enlarged schematic diagram of the middle A;

[0031] Figure 7 This is a schematic diagram of the distribution of the bottom of the spray pipe and the slurry storage pipe in the embodiment;

[0032] Figure 8 Schematic diagram of the connection between the first lifting plate and the second lifting plate in the embodiment;

[0033] Fig. 9 Schematic diagram of the installation of the brush in the through hole of the second lifting plate in the embodiment.

[0034] In the figure:

[0035] 100, desulfurization tower; 101, air intake pipe; 102, exhaust pipe; 103, ribs;

[0036] 200, spraying component; 201, slurry storage pipe; 201a, connecting pipe; 201b, slurry pipe; 202, spraying pipe; 202a, baffle; 203, second lifting plate; 203a, through hole; 203b, smoke hole; 204, brush;

[0037] 300, stirring component; 301, motor; 302, threaded rod; 303, first lifting plate; 303a, notch; 304, turntable; 305, stirring blade; 305a, guide slide groove; 306, limit plate; 307, connecting rod; 308, support tube. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0041] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0042] Example 1

[0043] Reference Figure 1-Figure 3 , which is the first embodiment of the present invention, provides a limestone gypsum wet desulfurization device, including a desulfurization tower 100 for receiving flue gas and limestone slurry for chemical reaction; a limestone slurry spraying component 200 is arranged inside the desulfurization tower 100, wherein the spraying component 200 includes a slurry storage pipe 201, a spray pipe 202 located below the slurry storage pipe 201, and a second lifting plate 203 that can be lifted and lowered for cleaning the spray pipe 202; a stirring component 300 is also arranged at the bottom of the desulfurization tower 100, and the stirring component 300 is used to stir the bottom slurry and the reaction product.

[0044] Specifically: A limestone gypsum wet desulfurization device includes an air intake pipe 101 and an exhaust pipe 102 connected to the inside of a desulfurization tower 100. The flue gas is transported to the inside of the desulfurization tower 100 through the air intake pipe 101 and then contacts with limestone slurry for reaction, wherein sulfur dioxide in the flue gas reacts with the limestone slurry to generate calcium sulfate dihydrate (complete desulfurization), and the flue gas continues to be transported upward inside the desulfurization tower 100 and is finally discharged from the exhaust pipe 102. The calcium sulfate dihydrate and the sprayed slurry fall to the bottom of the desulfurization tower 100 and are finally discharged.

[0045] The present invention proposes to set a plurality of spray pipes 202 in a ring shape inside the desulfurization tower 100, and the spray holes are opened on the circumferential surface of each spray pipe 202, so that the limestone slurry is sprayed in the horizontal direction, avoiding the flue gas from directly acting on the spray hole to impact it, and the reactants of the flue gas and the slurry will not adhere to the spray hole. Moreover, the slurry sprayed in the horizontal direction will not only react with the flue gas, but also act on the surface of the spray pipe 202 adjacent thereto. Even if a small amount of reactants adhere to the spray pipe 202 or the spray hole, the reactants attached to the surface of the spray pipe 202 can be cleaned away by the slurry sprayed in the horizontal direction, avoiding the spray hole from being blocked.

[0046] During the lifting process of the first lifting plate 303 in the present invention, the plurality of stirring blades 305 can both rotate and be lifted and lowered synchronously with the first lifting plate 303, so as to mix and stir the slurry at different heights inside the desulfurization tower 100 and improve the stirring action area. The second lifting plate 203 is connected to the first lifting plate 303 through the support pipe 308, and the two can move synchronously. During the lifting process of the first lifting plate 303, the stirring blades 305 are driven to stir the liquids at different heights, while the second lifting plate 203 slides relative to the spray pipe 202, and the brush 204 inside the through hole 203a can clean up the impurities stuck in the spray hole to prevent the limestone slurry impurities from clogging the spray hole.

[0047] Example 2

[0048] Reference Figure 1 -Figure-3 and Figure 7-Figure 9 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: a traditional desulfurization device usually arranges a limestone slurry spray head inside the desulfurization tower 100, and the flue gas is transported upward in a vertical direction. The slurry passes through the spray head and is sprayed in the direction opposite to the flue gas transportation direction. The slurry impurities remaining in the spray head will cause blockage, and the flue gas has a certain impact on the spray head. The flue gas reacts with the slurry that has just been sprayed. After a long time, the reactants will "hang" on the spray head, which will also cause blockage of the spray head.

[0049] In view of the above situation, the present invention is to fix a slurry storage pipe 201 inside the desulfurization tower 100, and the slurry storage pipe 201 is composed of two coaxially arranged annular pipes and a cylindrical pipe arranged in the center. The three are connected in turn through a connecting pipe 201a. The slurry pipe 201b (the slurry pipe 201b is connected to the external slurry system, and the prepared limestone slurry is injected into the slurry pipe 201b at a certain pressure to ensure that the slurry can finally be in a spraying shape) extends to the inside of the desulfurization tower 100 and is connected to the top of the cylindrical pipe. The center of the bottom of the cylindrical pipe and the bottom of the two annular pipes are connected in the vertical direction with a spray pipe 202. Each Spray holes are evenly arranged on the circumferential surface of the spray pipe 202, and the slurry is finally sprayed out from the spray holes of the spray pipe 202 in a horizontal direction, while the smoke is transported in a vertical direction, so it cannot impact the spray pipe 202, and the reactants of the smoke and the slurry will not "hang on the wall". In addition, since the slurry in the present invention is sprayed in a horizontal direction, the sprayed slurry will not only react with the smoke, but also act on the surface of the spray pipe 202 adjacent thereto. Even if a small amount of reactants will "hang on the wall", the reactants attached to the surface of the spray pipe 202 can be cleaned by the slurry sprayed in the horizontal direction.

[0050] In addition, part of the factors causing the spray pipe 202 to be blocked comes from impurities in the slurry, and these impurities will be stuck in the spray hole. In order to clean the impurities in the slurry, the present invention sets a second lifting plate 203 below the slurry storage tube 201, and a through hole 203a is opened on the plate surface of the second lifting plate 203 at the position corresponding to each spray pipe 202. The diameter of the through hole 203a is slightly larger than the spray pipe 202, and a brush 204 is installed on the inner wall of each through hole 203a. During the spraying process, the second lifting plate 203 moves back and forth in the vertical direction, and the brush 204 inside each through hole 203a slides relative to the surface of the spray pipe 202, thereby cleaning the spray hole on the spray pipe 202. The bottom end of each spray pipe 202 is integrally connected with a baffle 202a, and the diameter of the baffle 202a is larger than the through hole 203a, so as to limit the movement of the second lifting plate 203. After the flue gas enters the desulfurization tower 100 from the air inlet pipe 101, it must first pass through the second lifting plate 203 before entering the spraying range of the spray pipe 202. Therefore, a flue gas hole 203b is opened on the plate surface of the second lifting plate 203 for the flue gas to pass through.

[0051] The remaining structure is the same as that of the embodiment.

[0052] Example 3

[0053] Reference Figure 1-Figure 6 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that the products generated by the reaction of flue gas and limestone slurry and the slurry are finally collected at the bottom of the desulfurization tower 100, and calcium sulfate dihydrate is easy to condense at the bottom of the desulfurization tower 100. Once condensed, it will affect the discharge. Therefore, the present invention also sets a stirring component 300 at the bottom of the desulfurization tower 100 to stir the collected products. Specifically, a motor 301 is installed in the sealed cavity at the bottom of the desulfurization tower 100. The motor 301 axially extends to the inside of the desulfurization tower 100 and is connected to a threaded rod 302. The external thread of the threaded rod 302 is sleeved with a first lifting plate 303. The periphery of the first lifting plate 303 Notches 303a are formed symmetrically, and limiting ribs 103 matching the notches 303a are integrally formed on the inner wall of the desulfurization tower 100. When the motor 301 drives the threaded rod 302 to rotate, the first lifting plate 303 can be lifted and lowered at the bottom of the desulfurization tower 100 through the cooperation of the limiting ribs 103 and the notches 303a. A turntable 304 is also rotatably installed on the top of the first lifting plate 303, and a number of stirring blades 305 are distributed in a ring on the top of the turntable 304. When the motor 301 drives the threaded rod 302 to rotate, the turntable 304 and the threaded rod 302 rotate synchronously to drive the several stirring blades 305 to rotate, thereby stirring the collected slurry and reaction products.

[0054] Furthermore, the top of the threaded rod 302 is fixedly connected to the limit plate 306, and the interior of each stirring blade 305 is hollow. The cavity of the stirring blade 305 is connected to the limit plate 306 through a connecting rod 307. The top of the connecting rod 307 is hingedly connected to the edge of the limit plate 306, and the bottom end extends to the bottom of the cavity of the stirring blade 305 and slides with it through an axle pin. The inner wall of the stirring blade 305 corresponds to the two ends of the axle pin and is formed with guide grooves 305a. The motor 301 drives the threaded rod 302 to rotate, and the first lifting plate 303 slides upward inside the desulfurization tower 100. The turntable 304 slides upward synchronously with the first lifting plate 303. At the same time, the threaded rod 302 rotates while driving the turntable 304 to rotate relative to the first lifting plate 303 through several spray pipes 202, that is, several stirring blades 305 rotate and can be lifted and lowered in the vertical direction at the same time, thereby mixing and stirring the slurry at different heights inside the desulfurization tower 100 and improving the stirring action area.

[0055] The remaining structure is the same as that of the embodiment.

[0056] Example 4

[0057] Reference Figure 1-Figure 3 as well as Figure 8 , which is the fourth embodiment of the present invention. This embodiment is different from the third embodiment in that: the second lifting plate 203 in the present invention is connected to the first lifting plate 303 through a plurality of support tubes 308. When the first lifting plate 303 is lifted in the vertical direction, the second lifting plate 203 is lifted synchronously. By controlling the height of the limiting rib 103 to be consistent with the length of the spray pipe 202, when the first lifting plate 303 rises to the top of the limiting rib 103, the second lifting plate 203 just rises to contact with the bottom of the slurry storage pipe 201, that is, during the reciprocating lifting of the first lifting plate 303, the second lifting plate 203 can just move on the surface of the spray pipe 202 to complete the cleaning of the spray hole.

[0058] The remaining structure is the same as that of the embodiment.

[0059] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only several embodiments are described in detail in this disclosure, it should be easily understood by the personnel referring to this disclosure that many modifications are possible (for example, the size, scale, structure, shape and ratio of various elements, and parameter values ​​(for example, temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of a plurality of parts or elements, the position of the element can be inverted or otherwise changed, and the property or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method step can be changed or reordered according to alternative embodiments. Therefore, the present invention is not limited to specific embodiments, but extends to a variety of modifications still falling within the scope of the appended claims.

[0060] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A limestone gypsum wet desulfurization device, characterized in that: The invention comprises a desulfurization tower (100) for receiving flue gas and limestone slurry for chemical reaction; a limestone slurry spraying component (200) is arranged inside the desulfurization tower (100), wherein the spraying component (200) comprises a slurry storage pipe (201), a spraying pipe (202) located below the slurry storage pipe (201), and a second lifting plate (203) that can be lifted and lowered for cleaning the spraying pipe (202); a stirring component (300) is also arranged at the bottom of the desulfurization tower (100), and the stirring component (300) is used to stir the bottom slurry and the reaction product.

2. The limestone gypsum wet desulfurization device according to claim 1 is characterized in that: The slurry storage pipe (201) is composed of two coaxially arranged annular pipes and a cylindrical pipe arranged in the center. The three are connected in sequence through a connecting pipe (201a), and a slurry pipe (201b) is arranged at the upper end of the cylindrical pipe.

3. The limestone gypsum wet desulfurization device according to claim 2 is characterized in that: A plurality of the spray pipes (202) are provided and are evenly distributed on the bottom surfaces of the annular tube and the cylindrical tube, and a baffle (202a) is provided at the lower end of each of the spray pipes (202).

4. The limestone gypsum wet desulfurization device according to claim 3 is characterized in that: A through hole (203a) is provided on the plate surface of the second lifting plate (203) at a position corresponding to each of the spray pipes (202), and a brush (204) is provided on the inner wall of the through hole (203a). A smoke hole (203b) for smoke to pass through is also provided on the second lifting plate (203).

5. The limestone gypsum wet desulfurization device according to claim 4 is characterized in that: The stirring component (300) includes a motor (301) arranged in a sealed cavity at the bottom of the desulfurization tower (100), the motor (301) axially extending to the inside of the desulfurization tower (100) and connected to a threaded rod (302), and the external thread of the threaded rod (302) is sleeved with a first lifting plate (303).

6. The limestone gypsum wet desulfurization device according to claim 5, characterized in that: Notches (303a) are symmetrically formed around the periphery of the first lifting plate (303), and limiting ribs (103) adapted thereto are integrally formed at positions corresponding to the notches (303a) on the inner wall of the desulfurization tower (100).

7. The limestone gypsum wet desulfurization device according to claim 5, characterized in that: A turntable (304) is rotatably mounted on the top of the first lifting plate (303), and a plurality of stirring blades (305) are distributed in an annular manner on the top of the turntable (304).

8. The limestone gypsum wet desulfurization device according to claim 7, characterized in that: The top of the threaded rod (302) is fixedly connected to a limiting plate (306), and the interior of each stirring blade (305) is hollow. The cavity of the stirring blade (305) is connected to the limiting plate (306) via a connecting rod (307).

9. The limestone gypsum wet desulfurization device according to claim 8, characterized in that: The top end of the connecting rod (307) is hingedly connected to the edge of the limiting plate (306), and the bottom end extends to the bottom of the cavity of the stirring plate (305) and slidably cooperates with it through an axle pin. The inner wall of the stirring plate (305) is formed with guide grooves (305a) at both ends of the axle pin.

10. The limestone gypsum wet desulfurization device according to claim 7, characterized in that: The second lifting plate (203) is connected to the first lifting plate (303) via a plurality of support tubes (308).

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