Spray tower for wet purification of flue gas

Abstract

The utility model discloses a spray tower for wet purification of flue gas, which belongs to the technical field of spray towers and comprises a tower body, a circulating box, a spray component and a stirring component, the bottom of the tower body is integrally connected with the bottom of the circulating box, and slopes are arranged at the bottom of the tower body and the bottom of the circulating box. The height of the slope is gradually reduced from the bottom of the tower body to the bottom of the circulating box. According to the utility model, by arranging the spraying assembly and the stirring assembly, sediments in the circulating pool are reduced, the distribution uniformity of spraying liquid is ensured, and the flue gas purification efficiency is improved; the spraying liquid moves along the slope under the action of the stirring assembly, so that the spraying liquid circularly flows up and down in the circulating pool, and the distribution uniformity of the spraying liquid is further improved; the three layers of spray pipes are matched with the filler layer, so that the contact area with flue gas is large, and the flue gas purification effect is good; and the air return fan is arranged to circularly purify the purified flue gas.

Description

Technical Field

[0001] The utility model belongs to the technical field of spray towers, and in particular relates to a spray tower for wet purification of flue gas. Background Art

[0002] A spray tower is an environmentally friendly device used for waste gas treatment. When dust-laden waste gas or oil-laden waste gas passes through the spray tower, a liquid medium is sprayed out from a suitable position inside the tower. Some are alkaline solutions, and some are acid solutions. The solution contacts and reacts with the waste gas to purify the waste gas. Usually, a circulation pool and a circulation pump are set at the bottom of the spray tower to utilize the circulating solution to contact and react with the waste gas. In the existing circulation pool, the spray liquid has precipitation and is unevenly distributed in the pool body, thereby affecting the reaction efficiency with the waste gas during circulation, which is not conducive to the waste gas treatment effect. Utility Model Content

[0003] The technical problem solved by the utility model is to provide a spray tower for wet purification of flue gas to ensure the uniformity of the distribution of spray liquid and improve the flue gas purification efficiency.

[0004] Technical solution: In order to solve the above technical problems, the technical solution adopted by this utility model is as follows:

[0005] A spray tower for wet purification of flue gas comprises a tower body, a circulation box connected to the tower body, a spray assembly arranged on the tower body, and a stirring assembly arranged on the circulation box. The bottom of the tower body and the bottom of the circulation box are integrally connected, and a slope is provided on the bottom of the tower body and the bottom of the circulation box. The height of the slope gradually decreases from the bottom of the tower body to the bottom of the circulation box.

[0006] Furthermore, the spray assembly includes a first circulation pump, a second circulation pump, a first spray pipe connected to the first circulation pump, and a second spray pipe and a third spray pipe connected to the second circulation pump. The first spray pipe, the second spray pipe and the third spray pipe are located in the tower body and are spaced apart in the height direction.

[0007] Furthermore, the stirring assembly includes a driving motor arranged on the circulation box, a driving shaft connected to the driving motor, and an agitator arranged on the driving shaft, and the agitator is a propeller agitator.

[0008] Furthermore, the driving shaft is perpendicular to the slope surface of the slope.

[0009] Furthermore, the slope has a gradient of A, 0°<A<45°.

[0010] Furthermore, the tower body is provided with an air inlet and an air outlet, the air inlet is located on the side wall of the tower body, and the air outlet is located on the top of the tower body. The air entering the air inlet passes through the first spray pipe, the second spray pipe and the third spray pipe in sequence and is discharged from the air outlet.

[0011] Furthermore, a packing layer and a demister are provided in the tower body. The packing layer is located below the first spray pipe, and the demister is located above the third spray pipe.

[0012] Furthermore, the air outlet is connected to an air outlet pipe, the air inlet is connected to an air inlet pipe, and the air outlet pipe is connected to the air inlet pipe through a return air fan.

[0013] Furthermore, a cleaning water pipe corresponding to the demister is connected to the tower body, and a cleaning nozzle is provided on the cleaning water pipe.

[0014] Furthermore, the number of the first circulation pump and the second circulation pump are both set to more than one.

[0015] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0016] 1. By setting up spray components and stirring components, the precipitation in the circulation pool is reduced, the distribution uniformity of the spray liquid is ensured, and the flue gas purification efficiency is improved;

[0017] 2. A slope is set at the bottom of the circulation pool. The agitator of the stirring assembly is a propeller agitator. When the stirring assembly is working, it drives the spray liquid to circulate in the circulation pool. The spray liquid moves along the slope under the action of the stirring assembly, so that the spray liquid circulates up and down in the circulation pool, further improving the uniformity of the spray liquid distribution;

[0018] 3. The three-layer spray pipe is matched with the filler layer, which has a large contact area with the flue gas and a good flue gas purification effect;

[0019] 4. The return air fan can circulate and purify the clean flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of an embodiment of the utility model;

[0021] Figure 2 2. It is a schematic structural diagram of a circulating pool in an embodiment;

[0022] Figure 3 It is a schematic diagram of the flow state of the spray liquid when the stirring component is working. DETAILED DESCRIPTION

[0023] The present invention will be further illustrated below with reference to specific embodiments. The embodiments are implemented based on the technical solutions of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0024] like Figure 1 As shown, a spray tower for wet flue gas purification includes a tower body 1, a circulation box 2, a spray assembly, and a stirring assembly 4. The tower body 1 is a hollow cylindrical tower. The circulation box 2 is a rectangular box located on one side of the tower body 1. The width of the circulation box 2 is equal to the diameter of the tower body 1. The bottom of the tower body 1 and the bottom of the circulation box 2 are integrally connected. One side of the circulation box 2 is connected to the tower body 1, thereby forming a circulation pool for the spray liquid at the lower end of the tower body 1 and the circulation box 2. When used, this embodiment is used to remove pollutants such as fluoride and hydrogen chloride from flue gas. Quicklime (calcium hydroxide) is used as an absorbent. Quicklime (85% purity) is added to a lime emulsification tank, and process water is added simultaneously to react to produce a calcium hydroxide solution. The calcium hydroxide solution is then pumped into the circulation pool. The tower body 1 is provided with an air inlet 11 and an air outlet 12. The air inlet 11 is located on the side wall of the tower body 1, and the air outlet 12 is located at the top of the tower body 1.

[0025] like Figure 1 As shown, the spray assembly is arranged on the tower body 1, and the spray assembly includes a first circulation pump 31, a second circulation pump 32, a first spray pipe 33, a second spray pipe 34 and a third spray pipe 35. The first circulation pump 31 and the second circulation pump 32 are arranged on the outer top wall of the circulation box 2 and are distributed through pipelines and communicated with the circulation box 2, so that the spray liquid in the circulation box 2 can be extracted. The first spray pipe 33, the second spray pipe 34 and the third spray pipe 35 are all arranged in the tower body 1, the first spray pipe 33 is connected to the first circulation pump 31, and a plurality of nozzles are provided on the first spray pipe 33, the nozzles facing downward, and the second spray pipe 34 and the third spray pipe 35 are both connected to the second circulation pump 32 The second spray pipe 34 and the third spray pipe 35 are also provided with a plurality of downward-facing nozzles. The first spray pipe 33, the second spray pipe 34 and the third spray pipe 35 are arranged at equal distances in the height direction. The first spray pipe 33 is located at the bottom, the second spray pipe 34 is located above the first spray pipe 33, and the third spray pipe 35 is located above the second spray pipe 34, thereby forming three spray layers. The low-pressure drop nozzles provided on each spray layer can fully and reasonably cover the effective cross-section of the entire tower body 1 (the flue gas distribution cross-section), with a coverage rate of 200%. The cross-sectional spray volume is uniform, the gas-liquid contact area and contact probability are large, and the purification efficiency is effectively improved. The nozzle and the spray pipe are detachably connected to achieve quick disassembly, easy installation and replacement, and effectively reduce the working time and workload of maintenance and inspection. In this embodiment, the spray pipe adopts FRP anti-corrosion and high-temperature resistant material, and the nozzle is made of silicon carbide material, which is anti-corrosion and wear-resistant. The number of the first circulation pump 31 and the second circulation pump 32 can be set in parallel, one for main use and one for backup.

[0026] like Figure 1 As shown, a packing layer 13 and a demister 14 are also provided in the tower body 1. The packing layer 13 is located below the first spray pipe 33. A plurality of existing polypropylene spherical packings are provided in the packing layer 13. The packing layer 13 can slow down the airflow velocity and promote the uniform distribution of the flue gas in the tower body 1, which is beneficial for the full contact and reaction between the flue gas and the spray liquid. The packing increases the contact area between the flue gas and the spray liquid, which is beneficial for improving the flue gas treatment efficiency. The demister 14 is located above the third spray pipe 35. The flue gas entering the air inlet 11 passes through the packing layer 13, the first spray pipe 33, the second spray pipe 34, the third spray pipe 35 and the demister 14 in sequence and is discharged from the air outlet 12. The demister 14 adopts the existing baffle plate type demister. When the flue gas containing mist flows upward at a certain speed through the demister, due to the inertial impact of the gas, the mist collides with the corrugated plate and the gathered droplets are so large that the gravity generated by the mist itself exceeds the rising force of the gas and the tension of the liquid surface. When the combined force of the forces is applied, the droplets are separated from the surface of the corrugated plate to separate the droplets entrained in the clean flue gas and further remove the particulate matter carried in the flue gas. The demister 14 is made of reinforced polypropylene. A cleaning water pipe 7 corresponding to the demister 14 is connected to the tower body 1. A cleaning nozzle 71 is provided on the cleaning water pipe 7. The cleaning nozzle 71 is directed towards the demister 14 below, and can fully flush the demister 14 to avoid clogging of the demister 14. The cleaning water pipe 7 is made of polypropylene material, and the drainage directly enters the tower body 1.

[0027] like Figure 1 、 Figure 2 and Figure 3 As shown, the stirring assembly 4 is arranged on the circulation box 2. The stirring assembly 4 includes a drive motor 41, a drive shaft 42 and an agitator 43. The drive motor 41 is arranged on the outer top wall of the circulation box 2. The drive shaft 42 is connected to the drive motor 41. The agitator 43 is connected to the lower end of the drive shaft 42 and is located in the circulation box 2. The agitator 43 is a propeller agitator including three blades. When the drive motor 41 is working, the agitator 43 is driven to rotate through the drive shaft 42. A slope 5 is provided on the bottom of the tower body 1 and the bottom of the circulation box 2. The slope 5 has a slope A, 0°<A<45°. In this embodiment, A=5°. The height of the slope 5 gradually decreases from the bottom of the tower body 1 to the bottom of the circulation box 2. The stirring assembly 4 is tilted and arranged on the circulation box 2. The driving shaft 42 is perpendicular to the slope 5. Since the stirrer 43 is a propeller stirrer, when stirring, the spray liquid is sucked in from above the blade and discharged from below in a cylindrical spiral shape. The spray liquid flows to the bottom of the circulation box 2 along the slope 5 to both sides, hits the side wall of the circulation box 2 and the shell 1, then goes up along the side wall, and finally returns to the top of the stirrer 43 blade (the flow direction is as shown in FIG. Figure 3(Indicated by the black arrow in the middle section) The propeller agitator produces mild fluid turbulence while maintaining a high circulation volume. This allows the spray liquid to circulate within the circulation tank, creating a positive up-and-down tumbling effect. This further improves the uniformity of the spray liquid distribution within the circulation tank and reduces the formation of crystals and precipitation of purification byproducts within the circulation tank. A residual discharge pipe 21 is provided on the bottom sidewall of the circulation tank 2, corresponding to the lowest point of the slope 5.

[0028] like Figure 1 As shown, the air outlet 12 is connected to the air outlet pipe 121, and the air inlet 11 is connected to the air inlet pipe 111. The air outlet pipe 121 is connected to the air inlet pipe 111 through the return air fan 6. The inlet end of the return air fan 6 is connected to the air outlet pipe 121 through the first air duct 61. The first air duct 61 is provided with a first air valve 611. The outlet end of the return air fan 6 is connected to the air inlet pipe 111 through the second air duct. By setting the return air fan 6, the clean smoke discharged from the air outlet pipe 121 can be introduced into the air inlet pipe 111 for circulation and treatment.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A spray tower for wet flue gas purification, characterized in that: The invention comprises a tower body (1), a circulation box (2) connected to the tower body (1), a spray assembly arranged on the tower body (1), and a stirring assembly (4) arranged on the circulation box (2); the bottom of the tower body (1) and the bottom of the circulation box (2) are integrally connected; the bottom of the tower body (1) and the bottom of the circulation box (2) are provided with a slope (5); the height of the slope (5) gradually decreases from the bottom of the tower body (1) toward the bottom of the circulation box (2).

2. The spray tower for wet flue gas purification according to claim 1, characterized in that: The spray assembly comprises a first circulation pump (31), a second circulation pump (32), a first spray pipe (33) connected to the first circulation pump (31), and a second spray pipe (34) and a third spray pipe (35) connected to the second circulation pump (32); the first spray pipe (33), the second spray pipe (34) and the third spray pipe (35) are located in the tower body (1) and are spaced apart in a height direction.

3. The spray tower for wet flue gas purification according to claim 1, characterized in that: The stirring assembly (4) comprises a driving motor (41) arranged on the circulation box (2), a driving shaft (42) connected to the driving motor (41), and an agitator (43) arranged on the driving shaft (42); the agitator (43) is a propeller agitator.

4. The spray tower for wet flue gas purification according to claim 3, characterized in that: The driving shaft (42) is perpendicular to the slope surface of the slope (5).

5. The spray tower for wet flue gas purification according to claim 1, characterized in that: The slope (5) has a gradient of A, 0°<A<45°.

6. The spray tower for wet flue gas purification according to claim 2, characterized in that: An air inlet (11) and an air outlet (12) are provided on the tower body (1); the air inlet (11) is located on the side wall of the tower body (1); and the air outlet (12) is located on the top of the tower body (1); air entering the air inlet (11) passes through a first spray pipe (33), a second spray pipe (34), and a third spray pipe (35) in sequence upwards and is then discharged from the air outlet (12).

7. The spray tower for wet flue gas purification according to claim 2, characterized in that: A packing layer (13) and a demister (14) are further provided in the tower body (1); the packing layer (13) is located below the first spray pipe (33), and the demister (14) is located above the third spray pipe (35).

8. The spray tower for wet flue gas purification according to claim 6, characterized in that: The air outlet (12) is connected to an air outlet pipe (121), the air inlet (11) is connected to an air inlet pipe (111), and the air outlet pipe (121) is in communication with the air inlet pipe (111) via an air return fan (6).

9. The spray tower for wet flue gas purification according to claim 7, characterized in that: The tower body (1) is connected to a cleaning water pipe (7) corresponding to the demister (14), and a cleaning nozzle is provided on the cleaning water pipe (7).

10. The spray tower for wet flue gas purification according to claim 2, characterized in that: The number of the first circulation pump (31) and the second circulation pump (32) is more than one.

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