Reverse spraying washer applied to flue gas desulfurization and dust removal
By designing the reverse spray assembly and corrugated plate defogger in the wet scrubber, the problems of nozzle blockage and high power consumption are solved, and the efficient desulfurization and dust removal effect of the flue gas is achieved.
Patent Information
- Application Number
- CN202421541818.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-02
AI Technical Summary
During the use of existing wet scrubbers, the nozzles are easily blocked and corroded by dust in the flue gas, and the amount of electricity is relatively large.
A reverse spray scrubber applied to flue gas desulfurization and dust removal is designed. The reverse spray assembly and a corrugated plate defogger are used. Through the combination of the reverse nozzle and the compressed air nozzle, the reverse spraying of the washing liquid and the flue gas are realized, forming a foam zone to absorb dust, and the nozzle is stimulated through the compressed air to reduce the risk of nozzle blockage and power consumption.
It effectively avoids the problems of nozzle blockage and corrosion, reduces the amount of electricity, and realizes the triple functions of quenching flue gas, acid gas absorption and dust removal.
Smart Images
Figure CN222900588U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of environmental protection equipment, and particularly relates to a reverse spray scrubber applied to flue gas desulfurization and dust removal. Background Technique
[0002] The reverse spray scrubber belongs to a kind of wet scrubber. The wet scrubber is a dust removal equipment designed and manufactured by using wet dust removal technology, which can effectively remove liquid or solid particles with a diameter of 0.1 - 20 microns from the air flow, and can also remove some gaseous pollutants. It has the advantages of simple structure, small floor area, convenient operation and maintenance, and high purification efficiency. It can handle high-temperature and high-humidity air flows, minimizing the possibility of fire and explosion, so it is widely used in industries such as power generation, chemical products, oil refining and petrochemical.
[0003] However, it is found in actual use that the existing wet scrubbers have the following technical problems: First, the existing wet scrubbers generally use the spray method to adsorb dust in the flue gas. The spray is generated by using the mechanical pressurization method to make the washing liquid pass through the small orifices of the nozzle. However, as the service cycle increases, these small orifices will be blocked and corroded by the dust in the flue gas, resulting in defects in use; Second, the existing wet scrubbers generally use atomization in the venturi tube to adsorb dust in the flue gas. This requires a relatively high water column pressure for generating the spray, and the speed of the flue gas passing through the throat of the venturi tube is required to reach 100 - 400 feet per second. To achieve such a high speed, a high flange speed is required, so a high fan power is needed, and the power consumption of electricity is relatively large. Summary of the Utility Model
[0004] The utility model provides a reverse spray scrubber applied to flue gas desulfurization and dust removal, aiming to solve the technical problems that the nozzles for spraying in the existing wet scrubbers are easily blocked and corroded by the dust in the flue gas and the existing wet scrubbers consume a large amount of electric energy.
[0005] To achieve the above object, the technical solution of the utility model is as follows:
[0006] The utility model provides a reverse spray scrubber applied to flue gas desulfurization and dust removal, including:
[0007] A washing tank, having a flue gas inlet at its top, a purified gas outlet at the upper part of its side wall, and a liquid discharge port at its bottom;
[0008] A contact cylinder, arranged in the washing tank along the axis of the washing tank, and its top end is communicated with the flue gas inlet; an orifice plate is arranged in the throat section inside it;
[0009] A corrugated plate demister, arranged around the lower half of the contact cylinder;
[0010] Reverse spray assembly, which includes a reverse nozzle, a washing liquid pipeline, a compressed air nozzle and a compressed air pipeline. The reverse nozzle is arranged directly below the contact cylinder and has an upward opening. One end of the washing liquid pipeline is fixedly communicated with the reverse nozzle, and the other end is connected to a washing liquid source. One end of the compressed air pipeline is fixedly communicated with the compressed air nozzle, and the other end is connected to a compressed air source. The compressed air nozzle penetrates into the reverse nozzle from the bottom.
[0011] Furthermore, a maintenance opening is provided at the lower part of the side wall of the washing tank, and the maintenance opening is flange-connected with a baffle.
[0012] Furthermore, an overflow hole is provided at the lower part of the washing tank, and the vertical height of the overflow hole is lower than the installation height of the reverse nozzle.
[0013] Furthermore, a washing liquid replenishment port is provided at the lower part of the side wall of the washing tank.
[0014] Furthermore, legs are provided at the bottom of the washing tank.
[0015] Furthermore, the reverse nozzle is a trumpet-shaped through structure with a small upper opening and a large lower opening.
[0016] The beneficial effects achieved by the present utility model are as follows:
[0017] By setting the reverse spray assembly, the present utility model enables the flue gas to collide reversely with the washing liquid sprayed from the reverse nozzle to reach a state of momentum balance, forming a foam area. In the foam area, the turbulent film of the washing liquid will wrap the dust in the flue gas, increasing its volume and facilitating separation from the flue gas. Also, due to the continuous evaporation of water in the washing liquid, the flue gas will be cooled to the adiabatic saturation temperature. The decrease in temperature reduces the equilibrium partial pressure of acidic gases in the gas phase, promoting the continuous reaction of acidic gases with the washing liquid, thereby realizing the three functions of rapid cooling of the flue gas, absorption of acidic gases, and removal of dust.
[0018] Based on the principle of countercurrent contact between medium-speed flue gas and a relatively high-speed liquid flow atomized by compressed air, the present utility model generates a very effective turbulent flow area for collecting fine dust particles, namely a high-speed impact area. Therefore, the reverse nozzle used to atomize and pump the washing liquid to the contact area has a relatively large cross-sectional orifice, allowing the washing liquid with a high solid content to be recycled without the risk of blockage, thereby avoiding the technical problems that the nozzles of existing wet scrubbers are easily blocked by dust in the flue gas and corroded as the service life increases.
[0019] The present utility model is a scrubber with a compressed air-activated nozzle and has a low requirement for the flow rate of the flue gas. Therefore, compared with existing wet scrubbers, the power requirement of the high-pressure fan is effectively reduced, thereby saving the use of electric energy. Description of the Drawings
[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.
[0021] Figure 1 Schematic three-dimensional structure of the present invention Figure 1 ;
[0022] Figure 2 Exploded three-dimensional structure schematic of the present invention Figure 1 (Hidden layer tank body);
[0023] Figure 3 Schematic three-dimensional structure of the present invention Figure 2 ;
[0024] Figure 4 Exploded three-dimensional structure schematic of the present invention Figure 2 (Hidden layer tank body);
[0025] Figure 5 Exploded sectional view schematic of the three-dimensional structure of the present invention;
[0026] Figure 6 Schematic three-dimensional structure of the corrugated plate demister of the present invention.
[0027] In the figure, 1. Washing tank; 1-1. Flue gas inlet; 1-2. Purified gas outlet; 1-3. Drainage port; 1-4. Inspection port; 1-5. Overflow port; 1-6. Make-up liquid port; 1-7. Leg; 2. Contact cylinder; 2-1. Orifice plate; 3. Corrugated plate demister; 4. Reverse spray assembly; 4-1. Nozzle; 4-2. Washing liquid pipeline; 4-3. Compressed air nozzle; 4-4. Compressed air pipeline. Detailed implementation manners
[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.
[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, then the directional indications will also change accordingly.
[0030] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0031] As Figures 1 to 6 shown, the present utility model provides a reverse spray scrubber applied to flue gas desulfurization and dust removal, which includes a scrubbing tank 1 and legs 1-7 for supporting and fixing the scrubbing tank 1. A dust-containing gas inlet 1-1 is provided at the top of the scrubbing tank 1, and the dust-containing gas inlet 1-1 is communicated with the dust-containing gas transmission pipeline in the workshop. Medium-speed dust-containing gas continuously enters the device through the dust-containing gas inlet 1-1 for scrubbing; a purified gas outlet 1-2 is provided at the upper part of the side wall of the scrubbing tank 1, and the purified gas outlet 1-2 is communicated with the purified gas transmission pipeline or the external discharge pipeline in the workshop; a liquid discharge port 1-3 is provided at the lowest point of the bottom of the scrubbing tank 1, and the liquid discharge port 1-3 is communicated with the slurry transmission pipeline in the workshop.
[0032] Furthermore, the slurry transmission pipeline is connected to the washing liquid pipeline 4-2 after circulating filtration for recycling.
[0033] The dust-containing gas inlet 1-1 is connected downward and extends into a contact cylinder 2 inside the scrubbing tank 1. An orifice plate 2-1 is provided in the throat section inside the contact cylinder 2, and the orifice plate 2-1 is used to disperse the dust-containing gas so that it can fully contact the washing liquid; a corrugated plate demister 3 is circumferentially arranged around the lower half of the contact cylinder 2, and the corrugated plate demister 3 is used to separate the mist in the purified gas; the outlet of the purified gas outlet 1-2 is arranged above the corrugated plate demister 3.
[0034] Further, the orifice plate 2-1 is a circular plate, and the orifice plate 2-1 is provided with a plurality of round holes.
[0035] Further, the corrugated plate demister 3 is an annular structure, including a fixing ring and a plurality of corrugated plates. The fixing ring is connected to the inner wall of the washing tank 1, and the corrugated plates are evenly arranged on the inner circumferential side of the fixing ring in a circumferential manner; one end of the corrugated plate is connected to the fixing ring, and the other end is connected to the contact cylinder 2.
[0036] A reverse spraying assembly 4 is arranged below the contact cylinder 2. The reverse spraying assembly 4 includes a reverse nozzle 4-1, a washing liquid pipeline 4-2, a compressed air nozzle 4-3 and a compressed air pipeline 4-4; the reverse nozzle 4-1 is arranged on the contact cylinder 2 and has an upward opening. One end of the washing liquid pipeline 4-2 is fixedly communicated with the reverse nozzle 4-1, and the other end is connected to a washing liquid source. One end of the compressed air pipeline 4-4 is fixedly communicated with the compressed air nozzle 4-3, and the other end is connected to a compressed air source. The compressed air nozzle 4-3 penetrates into the contact cylinder 2 from the bottom of the reverse nozzle 4-1, so that the compressed air can activate the reverse nozzle, and then atomize the washing liquid and press it into the contact cylinder 2 to react with the flue gas.
[0037] Further, the reverse nozzle 4-1 is a trumpet-shaped through structure with a small upper opening and a large lower opening.
[0038] An inspection opening 1-4 is arranged at the lower part of the side wall of the washing tank 1. The inspection opening 1-4 is flange-connected with a baffle. When maintenance is required, the scrubber is turned off and the baffle is opened to perform maintenance.
[0039] An overflow hole 1-5 is arranged at the lower part of the washing tank 1. The vertical height of the overflow hole 1-5 is slightly lower than the installation height of the reverse nozzle 4-1.
[0040] A washing liquid replenishing port 1-6 is arranged at the lower part of the side wall of the washing tank 1 for replenishing the washing liquid lost during the circulation process.
[0041] Specifically, the working principle of the present utility model is as follows:
[0042] Medium-speed flue gas enters the contact cylinder 2 inside the scrubbing tank 1 from the flue gas inlet 1-1, and further collides reversely with the scrubbing liquid sprayed by the reverse spray head 4-1 below the orifice plate 2-1 to reach a state of momentum balance, forming a foam zone. In the foam zone, the turbulent film of the scrubbing liquid will wrap the dust in the flue gas, increasing its volume and facilitating separation from the flue gas. Also, due to the continuous evaporation of the water in the scrubbing liquid, the flue gas will be cooled to the adiabatic saturation temperature. The decrease in the flue gas temperature reduces the equilibrium partial pressure of the acidic gas in the gas phase, prompting the acidic gas to continuously react with the scrubbing liquid, thus realizing the three functions of rapid cooling of the flue gas, absorption of acidic gas, and removal of dust. The treated dust and acidic substances will flow to the bottom of the scrubbing tank 1 with the scrubbing liquid for recovery. The liquid can also be transported to the reverse nozzle 4-1 through the scrubbing liquid pipeline 4-2 by a circulating separation device for recycling. The purified gas will pass through the corrugated plate demister 3 to remove the remaining liquid droplets and then be discharged outside the scrubbing tank 1 through the purified gas outlet 1-2.
[0043] The working principle of the corrugated plate demister 3 of the present utility model is as follows: When the purified gas containing mist flows through the corrugated plate demister 3 at a certain speed, due to the inertial impact of the gas, the mist collides with the corrugated plates of the corrugated plate demister 3 and is aggregated. When the liquid droplets are large enough so that the gravity generated by themselves exceeds the resultant force of the upward force of the gas and the surface tension of the liquid, the liquid droplets are separated from the surface of the corrugated plate. The mist droplets converge to form a water flow, and due to the action of gravity, it falls to the bottom of the scrubbing tank 1, thereby realizing gas-liquid separation, and enabling the purified gas flowing through the demister to meet the demisting requirements and then be discharged.
[0044] The above are only optional embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made by using the description and drawings of the present utility model under the inventive concept of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.
Claims
1. A reverse jet scrubber for flue gas desulfurization and dust removal, characterized in that: include: A washing tank (1) is provided with a smoke inlet (1-1) at the top, a purified gas outlet (1-2) at the upper part of the side wall, and a liquid discharge port (1-3) at the bottom; A contact cylinder (2) is arranged in the washing tank (1) and along the axis of the washing tank (1), and its top end is connected to the smoke inlet (1-1); a perforated plate (2-1) is arranged in the throat section of the contact cylinder; A corrugated plate demister (3) is disposed around the lower half of the contact cylinder (2); A reverse spray assembly (4) comprises a reverse nozzle (4-1), a washing liquid pipeline (4-2), a compressed air nozzle (4-3) and a compressed air pipeline (4-4); the reverse nozzle (4-1) is arranged directly below the contact cylinder (2) and has its opening facing upward; one end of the washing liquid pipeline (4-2) is fixedly connected to the reverse nozzle (4-1) and the other end is connected to a washing liquid source; one end of the compressed air pipeline (4-4) is fixedly connected to the compressed air nozzle (4-3) and the other end is connected to a compressed air source; the compressed air nozzle (4-3) penetrates from the bottom of the reverse nozzle (4-1).
2. A reverse jet scrubber for flue gas desulfurization and dust removal according to claim 1, characterized in that: The lower part of the side wall of the washing tank (1) is provided with an inspection port (1-4), and the inspection port (1-4) is flange-connected to a baffle.
3. A reverse jet scrubber for flue gas desulfurization and dust removal according to claim 1, characterized in that: An overflow hole (1-5) is provided at the lower part of the washing tank (1), and the vertical height of the overflow hole (1-5) is lower than the installation height of the counter nozzle (4-1).
4. A reverse jet scrubber for flue gas desulfurization and dust removal according to claim 1, characterized in that: The lower part of the side wall of the washing tank (1) is provided with a washing liquid replenishing port (1-6).
5. The reverse jet scrubber for flue gas desulfurization and dust removal according to claim 1, characterized in that: The bottom of the washing tank (1) is provided with supporting legs (1-7).
6. A reverse jet scrubber for flue gas desulfurization and dust removal according to claim 1, characterized in that: The reverse nozzle (4-1) is a trumpet-shaped through-hole structure with a small opening at the upper end and a large opening at the lower end.