A water bead separator for a flue gas scrubbing tower chimney top

Abstract

This invention specifically relates to a water droplet separator at the top of a flue gas scrubbing tower chimney. In this device, flue gas carrying droplets passes through a conical hopper, a first cooling channel, and a second cooling channel sequentially via the flue gas inlet. During this process, the flue gas gradually cools and water droplets accumulate. Small droplets and particulate matter carried within the flue gas gather in the second cooling channel to form large droplets containing particulate matter, which then flow into and accumulate in the collection chamber. After separation, the gas enters the outside from the upper end of the collection chamber and is discharged. The first cooling channel faces upward, and the second cooling channel faces downward, which can effectively prevent the large droplets formed in the second cooling channel from flowing back to the first cooling channel and then back into the chimney and its scrubbing tower slurry pool. This prevents the droplets from being blown apart and broken up again by the rapidly rising flue gas below, thus avoiding secondary entrainment in the flue gas. This improves the demisting efficiency and reduces the concentration of water droplets and particulate matter in the emitted gas.

Description

Technical Field

[0001] This invention relates to the field of tower equipment technology, and specifically to a water droplet separator at the top of the chimney of a flue gas scrubbing tower. Background Technology

[0002] Modern environmental standards not only address gaseous pollutants (such as SO2 and NO) x There are strict requirements, and there are also strict limits on the emission concentration of particulate matter (including condensable particulate matter).

[0003] In the process of removing pollutants such as sulfur dioxide, flue gas scrubbing towers (such as wet desulfurization towers) will form a large number of fine droplets carrying dissolved solids (such as gypsum, chlorides, fluorides, etc.). After these droplets evaporate, they will form fine solid particles (which can condense particulate matter), resulting in the measured value of particulate matter emission concentration exceeding the standard. These droplets are directly discharged into the atmosphere with the flue gas and settle downwind, forming "gypsum rain" or "blue smoke / white smoke trails", which will cause environmental and visual pollution. At the same time, the washed droplets are usually acidic (containing SO3 acid mist, HCl, HF, etc.) and contain corrosive salts. If the droplets are carried into the downstream flue, induced draft fan, and chimney, it will cause (1) severe corrosion: shorten the equipment life and greatly increase the maintenance cost; (2) induced draft fan failure: droplets attached to the fan blades may cause start-up imbalance, vibration and corrosion, affecting the safety of operation; (3) damage to the chimney lining: accelerate the corrosion of the chimney, especially the steel chimney.

[0004] Existing water droplet separators typically consist of a series of bent corrugated plates or filter screens. When flue gas carrying droplets passes through the separator, the gas can pass smoothly, while droplets with greater inertia will collide with the plate walls or screens, agglomerate into larger droplets, and fall under gravity, eventually flowing back to the slurry pool of the scrubbing tower. During the fall of these large droplets, they will encounter the high-speed rising flue gas below (typically 3-5 m / s). The high-speed airflow will blow away and break up these falling droplets again, and carry them back into the flue gas, causing secondary entrainment. This seriously affects the final demisting efficiency, resulting in the concentration of particulate matter in the emitted flue gas still exceeding the standard. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a water droplet separator at the top of the flue gas scrubbing tower chimney.

[0006] The technical solution adopted in this invention is as follows: a water droplet separator at the top of a flue gas scrubbing tower chimney, which has a first cooling channel, a second cooling channel and a collection chamber connected in sequence. The lower end of the first cooling channel is the flue gas inlet and its flow direction is upward. The lower end of the second cooling channel is connected to the collection chamber and its flow direction is downward. The upper end of the collection chamber is connected to the outside.

[0007] Preferably, it includes a first cylindrical component, a second cylindrical component, and a third cylindrical component. The first cylindrical component is located inside the second cylindrical component, and the two form an annular first cooling channel between them. The second cylindrical component is located inside the third cylindrical component, and the two form an annular second cooling channel between them. The upper end of the first cooling channel and the second cooling channel are connected through a connecting cavity located at the upper end of the second cylindrical component. The upper end of the first cylindrical component and the upper end of the second cylindrical component are connected to a sealing plate that closes the upper end of the connecting cavity.

[0008] Preferably, it also includes a fourth cylinder surrounding the third cylinder, the lower end of the fourth cylinder being connected to the annular sidewall of the second cylinder, and a collection cavity located below the second cooling channel is formed between the fourth cylinder, the second cylinder, and the third cylinder.

[0009] Preferably, the fourth cylindrical component includes a straight cylindrical section and a conical cylindrical section from top to bottom, the upper end of the straight cylindrical section is the gas outlet, and the size of the conical cylindrical section decreases from top to bottom.

[0010] Preferably, the lower end of the fourth cylindrical component is provided with a connecting pipe.

[0011] Preferably, the first cylindrical member, the second cylindrical member, and the third cylindrical member are all straight cylindrical and concentrically arranged.

[0012] Preferably, the second cooling channel has a first reinforcing block at at least one position around its circumference that connects the outer wall of the second cylinder and the inner wall of the third cylinder, and / or the connecting cavity has a second reinforcing block at at least one position around its circumference that connects the outer wall of the first cylinder and the outer wall of the third cylinder.

[0013] Preferably, a third reinforcing block is connected between the upper outer wall of the third cylindrical member and the upper inner wall of the fourth cylindrical member at at least one position around its circumference.

[0014] Preferably, a fourth reinforcing block is provided at least one position around the first cooling channel to connect the outer wall of the first cylinder and the inner wall of the second cylinder.

[0015] Preferably, the lower outer periphery of the second cylindrical member is connected to a tapered hopper whose size decreases from bottom to top.

[0016] The beneficial effects of this invention are as follows: In this device, flue gas carrying droplets passes through the first cooling channel and the second cooling channel sequentially through the flue gas inlet. During this process, the flue gas gradually cools down. The small droplets and particulate matter carried in the flue gas gather in the second cooling channel to form large droplets containing particulate matter, which then flow into and accumulate in the collection chamber. After separation, the gas enters the outside from the upper end of the collection chamber and is discharged. The first cooling channel faces upward and the second cooling channel faces downward, which can effectively prevent the large droplets formed in the second cooling channel from flowing back to the first cooling channel and then flowing back to the scrubbing tower slurry pool. This prevents the droplets from being blown apart and broken up again by the high-speed rising flue gas below and causing secondary entrainment in the flue gas, thereby improving the demisting efficiency and reducing the concentration of particulate matter in the emitted gas. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0018] Figure 1 This is a front view structural diagram of an embodiment of the present invention; Figure 2 This is a top view of the structure according to an embodiment of the present invention; Figure 3 for Figure 2 Sectional view of section AA in the middle; Figure 4 for Figure 2 Sectional view at point BB; In the diagram, 1 is the first cylindrical component; 2 is the second cylindrical component; 3 is the third cylindrical component; 4 is the fourth cylindrical component; 5 is the first cooling channel; 6 is the second cooling channel; 7 is the collecting chamber; 8 is the connecting chamber; 9 is the sealing plate; 10 is the narrowed conical hopper; 41 is the straight cylindrical section; 42 is the conical section; 43 is the connecting pipe; 44 is the third reinforcing block; 51 is the fourth reinforcing block; 61 is the first reinforcing block; 81 is the second reinforcing block; and 411 is the gas outlet. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0021] The directional and positional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for illustrating and understanding this invention, and not for limiting the scope of protection of this invention.

[0022] like Figures 1 to 4 As shown in the embodiment of the present invention, a water droplet separator is provided at the top of the chimney of a flue gas scrubbing tower. It has a first cooling channel 5, a second cooling channel 6, and a collection chamber 7 connected in sequence. The lower end of the first cooling channel 5 is a flue gas inlet 51 and its flow direction is upward. The lower end of the second cooling channel 6 is connected to the collection chamber 7 and its flow direction is downward. The upper end of the collection chamber 7 is connected to the outside.

[0023] With this setup, the flue gas carrying droplets passes through the first cooling channel and the second cooling channel sequentially through the flue gas inlet. During this process, the flue gas gradually cools down. The small droplets and particulate matter carried within it accumulate in the second cooling channel, forming large droplets containing particulate matter, which then flow into and accumulate in the collection chamber. After separation, the gas enters the outside from the top of the collection chamber and is discharged. The first cooling channel faces upward, and the second cooling channel faces downward, which effectively prevents the large droplets formed in the second cooling channel from flowing back to the first cooling channel and then back to the scrubbing tower slurry pool. This prevents them from being blown apart and broken up again by the rapidly rising flue gas below, thus avoiding secondary entrainment in the flue gas. This improves the demisting efficiency and reduces the concentration of particulate matter in the emitted gas.

[0024] The first cooling channel faces upward, which can be either vertically upward or inclined upward, while the second cooling channel faces downward, which can be either vertically downward or inclined downward.

[0025] It includes a first cylindrical component 1, a second cylindrical component 2, and a third cylindrical component 3. The first cylindrical component 1 is located inside the second cylindrical component 2, and the two form an annular first cooling channel 5. The second cylindrical component 2 is located inside the third cylindrical component 3, and the two form an annular second cooling channel 6. The upper end of the first cooling channel 5 and the second cooling channel 6 are connected through a connecting cavity 8 located at the upper end of the second cylindrical component 2. The upper end of the first cylindrical component 1 and the upper end of the second cylindrical component 2 are connected to a sealing plate 9 that closes the upper end of the connecting cavity 8.

[0026] The top of a flue gas scrubbing tower is typically equipped with a swirl generator, specifically a device with a fixed impeller or swirl plate. The passing flue gas forms a swirling, centrifugal upward flow and enters the first cooling channel through the flue gas inlet. The annular shape of the flue gas inlet effectively complements the swirling upward flow of the flue gas. Simultaneously, the centrifugal upward flow facilitates the use of centrifugal force to throw droplets against the wall for separation. Specifically, all cylindrical components have circular cross-sections, including the circular flue gas inlet.

[0027] It also includes a fourth cylinder 4 surrounding the third cylinder 3, the lower end of the fourth cylinder 4 being connected to the annular side wall of the second cylinder 2, and a collection cavity 7 located below the second cooling channel 6 being formed between the fourth cylinder 4, the second cylinder 2, and the third cylinder 3.

[0028] This design simplifies the structure of the device and provides excellent cooling separation.

[0029] The fourth cylindrical component 4 includes a straight cylindrical section 41 and a conical cylindrical section 42 from top to bottom. The upper end of the straight cylindrical section 41 is a gas outlet 411, and the size of the conical cylindrical section 42 decreases from top to bottom.

[0030] This setting improves the collection efficiency of the collection chamber.

[0031] The lower end of the fourth cylindrical component 4 is provided with a connecting pipe 43.

[0032] This setup allows the collected liquid in the collection chamber to be drained via a connecting pipe.

[0033] The first cylindrical component 1, the second cylindrical component 2, and the third cylindrical component 3 are all straight cylindrical and concentrically arranged.

[0034] With this setup, the airflow in the first cooling channel goes straight up, while the airflow in the second cooling channel goes straight down, further improving the cooling separation effect and preventing backflow.

[0035] The second cooling channel 6 has a first reinforcing block 61 at least one position around its circumference, connecting the outer wall of the second cylinder 2 and the inner wall of the third cylinder 3, and / or the connecting cavity 8 has a second reinforcing block 81 at least one position around its circumference, connecting the outer wall of the first cylinder 1 and the outer wall of the third cylinder 3.

[0036] This design improves the structural strength of the device. In this embodiment, a first reinforcing block and a second reinforcing block are provided, both integrally formed.

[0037] A third reinforcing block 44 is connected between the upper outer wall of the third cylindrical member 3 and the upper inner wall of the fourth cylindrical member 4 at at least one position around its circumference.

[0038] The first cooling channel 5 has a fourth reinforcing block 51 at at least one position around its circumference, which connects the outer wall of the first cylinder 1 and the inner wall of the second cylinder 2.

[0039] This design further enhances the structural strength of the device.

[0040] The lower outer periphery of the second cylindrical component 2 is connected to a tapered hopper 10 whose size decreases from bottom to top.

[0041] This design guides the flue gas as it enters the flue gas inlet. The cone is specifically connected to the chimney at the top of the flue gas scrubbing tower, and the swirl generator can be installed inside the cone or inside the chimney.

[0042] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A water droplet separator at the top of the chimney of a flue gas scrubbing tower, characterized in that: It has a first cooling channel (5), a second cooling channel (6), and a collection chamber (7) connected in sequence. The lower end of the first cooling channel (5) is a flue gas inlet (51) and its flow direction is upward. The lower end of the second cooling channel (6) is connected to the collection chamber (7) and its flow direction is downward. The upper end of the collection chamber (7) is connected to the outside.

2. A water droplet separator at the top of the chimney of a flue gas scrubbing tower according to claim 1, characterized in that: It includes a first cylindrical component (1), a second cylindrical component (2), and a third cylindrical component (3). The first cylindrical component (1) is located inside the second cylindrical component (2) and a first cooling channel (5) is formed between them in an annular shape. The second cylindrical component (2) is located inside the third cylindrical component (3) and a second cooling channel (6) is formed between them in an annular shape. The upper end of the first cooling channel (5) and the second cooling channel (6) are connected through a connecting cavity (8) located at the upper end of the second cylindrical component (2). A sealing plate (9) is connected to the upper end of the first cylindrical component (1) and the upper end of the second cylindrical component (2) to form a seal at the upper end of the connecting cavity (8).

3. A water droplet separator at the top of the flue gas scrubbing tower chimney according to claim 2, characterized in that: It also includes a fourth cylinder (4) surrounding the third cylinder (3), the lower end of the fourth cylinder (4) being connected to the side wall of the second cylinder (2), and a collection cavity (7) being formed between the fourth cylinder (4), the second cylinder (2), and the third cylinder (3) below the second cooling channel (6).

4. A water droplet separator at the top of the flue gas scrubbing tower chimney according to claim 3, characterized in that: The fourth cylindrical part (4) includes a straight cylindrical part (41) and a conical part (42) from top to bottom. The upper end of the straight cylindrical part (41) is a gas outlet (411), and the size of the conical part (42) decreases from top to bottom.

5. A water droplet separator at the top of the chimney of a flue gas scrubbing tower according to claim 3, characterized in that: The lower end of the fourth cylindrical component (4) is provided with a connecting pipe (43).

6. A water droplet separator at the top of the chimney of a flue gas scrubbing tower according to claim 2, characterized in that: The first cylindrical component (1), the second cylindrical component (2), and the third cylindrical component (3) are all straight cylindrical and concentrically arranged.

7. A water droplet separator at the top of the flue gas scrubbing tower chimney according to claim 2, characterized in that: The second cooling channel (6) has a first reinforcing block (61) at least one position around its circumference that connects the outer wall of the second cylinder (2) and the inner wall of the third cylinder (3), and / or the connecting cavity (8) has a second reinforcing block (81) at least one position around its circumference that connects the outer wall of the first cylinder (1) and the outer wall of the third cylinder (3).

8. A water droplet separator at the top of a flue gas scrubbing tower chimney according to claim 2, characterized in that: A third reinforcing block (44) is connected between the upper outer wall of the third cylinder (3) and the upper inner wall of the fourth cylinder (4) at at least one position around its circumference.

9. A water droplet separator at the top of the flue gas scrubbing tower chimney according to claim 2, characterized in that: The first cooling channel (5) has a fourth reinforcing block (51) at least one position around its circumference, which connects the outer wall of the first cylinder (1) and the inner wall of the second cylinder (2).

10. A water droplet separator at the top of the chimney of a flue gas scrubbing tower according to any one of claims 2-9, characterized in that: The lower outer periphery of the second cylindrical piece (2) is connected to a tapered hopper (10) whose size decreases from bottom to top.

Images