Seawater desulfurization device

Abstract

The utility model relates to the technical field of flue gas desulfurization, and discloses a seawater desulfurization device which comprises an absorption tower shell, and further comprises an absorption tower flue gas inlet and an absorption tower flue gas outlet which are arranged on the absorption tower shell, and the absorption tower flue gas inlet is arranged below the absorption tower flue gas outlet. The absorption tower flue gas inlet and the absorption tower flue gas outlet are both communicated with the inner space of the absorption tower shell, the first packing layer, the second packing layer, the spraying layer and the demister are arranged in the inner space of the absorption tower shell from bottom to top in sequence, and the first packing layer is located above the absorption tower flue gas inlet. The flue gas desulfurization device solves the problems of low flue gas desulfurization efficiency and the like in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to a seawater desulfurization device belongs to the technical field of flue gas desulfurization. BACKGROUND

[0002] The seawater flue gas desulfurization technology uses natural alkaline seawater as SO2 removal reagent, and has the advantages of simple process, easy operation, high desulfurization efficiency, low investment and operation cost, and becomes the preferred technology for flue gas desulfurization of coastal power plants.

[0003] The seawater flue gas SO2 removal packed tower has the characteristics of large tower diameter, low flue gas flow rate in the tower, long residence time, sufficient contact between flue gas and seawater, high desulfurization and dust removal efficiency. According to different structures, the packing used for seawater flue gas desulfurization includes random packing and structured packing. The random packing has high disorder degree, good mass transfer effect, strong self-adaptability, large operation flexibility, easy maintenance and replacement, but is prone to blockage under complex conditions such as high liquid-gas ratio, causing liquid flooding, reducing desulfurization efficiency and affecting the safe operation of the desulfurization system. The structured packing has uniform structure, good fluid distribution effect, stable mass transfer performance and high mechanical strength, but usually has high price, large operation and maintenance difficulty, and limited application range. Patent CN101708429B introduces a seawater flue gas desulfurization process using modified PP structured packing. Compared with random packing, the packing layer height and desulfurization seawater consumption of the packing layer using structured packing technology are reduced by more than 20%-30%, but the overall desulfurization efficiency is not high. Patent CN220737014U proposes a high-efficiency seawater flue gas desulfurization absorption tower combining spray and packed tower technologies, which uses single PP random packing or structured packing, and the flue gas desulfurization efficiency is close to 100%, but the absorption zone of the absorption tower has large resistance and has the risk of liquid flooding. SUMMARY

[0004] To overcome the shortcomings of the prior art, the utility model provides a seawater desulfurization device, which solves the problems of low flue gas desulfurization efficiency in the prior art.

[0005] The utility model solves the technical scheme adopted by the above problems:

[0006] A seawater desulfurization device, comprising an absorption tower shell, an absorption tower flue gas inlet and an absorption tower flue gas outlet provided on the absorption tower shell, the absorption tower flue gas inlet being located below the absorption tower flue gas outlet, both the absorption tower flue gas inlet and the absorption tower flue gas outlet being in communication with the internal space of the absorption tower shell, and a first packing layer, a second packing layer, a spray layer and a demister being sequentially arranged in the internal space of the absorption tower shell from bottom to top, the first packing layer being located above the absorption tower flue gas inlet.

[0007] As a preferred technical scheme, the seawater desulfurization device further comprises a packing layer support grid arranged in the internal space of the absorption tower shell, the packing layer support grid is arranged below the first packing layer, and the packing layer support grid is arranged above the flue gas inlet of the absorption tower.

[0008] As a preferred technical scheme, the height of the first packing layer is 1000-4500 mm.

[0009] As a preferred technical scheme, the height of the second packing layer is 500-3000 mm.

[0010] As a preferred technical scheme, the height ratio of the first packing layer to the second packing layer is 0.3-9.0.

[0011] As a preferred technical scheme, the porosity of the packing in the second packing layer is greater than or equal to 60%.

[0012] As a preferred technical scheme, the porosity ratio of the first packing layer to the second packing layer is 0.6-1.5.

[0013] As a preferred technical scheme, the distance between the top of the second packing layer and the bottom of the spray layer is 1000-3000 mm.

[0014] As a preferred technical scheme, the vertical distance between the bottom of the first packing layer and the upper edge of the flue gas inlet of the absorption tower is 1000-3000 mm.

[0015] As a preferred technical scheme, the packing in the first packing layer is irregular packing, and the packing in the second packing layer is regular packing.

[0016] Compared with the prior art, the seawater desulfurization device has the following beneficial effects:

[0017] (1) The seawater desulfurization device has high desulfurization efficiency.

[0018] (2) The first packing layer and the second packing layer are designed in a partitioned manner, so that the seawater desulfurization device is more economical and reliable, and the resistance in the absorption area is low. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a structural schematic view of the utility model.

[0020] In the drawings, the marks and their corresponding names are as follows: 1-flue gas inlet of absorption tower, 211-packing layer support grid, 212-first packing layer, 213-second packing layer, 22-spray layer, 23-demister, 3-absorption tower shell, 4-flue gas outlet of absorption tower. DETAILED DESCRIPTION

[0021] The utility model is further explained in detail below in combination with the embodiments and drawings, but the implementation mode of the utility model is not limited to this.

[0022] Embodiment 1

[0023] As Figure 1 shown, in combination with the advantages of random packed fillers and structured packed fillers, the utility model develops a more efficient seawater flue gas desulfurization device, which meets the flue gas SO2 emission limit value and reduces the absorption zone resistance in the tower, prevents liquid flooding, and realizes the dual optimization of desulfurization efficiency and energy consumption.

[0024] The utility model aims at providing a device for optimizing gas-liquid mass transfer to realize efficient seawater flue gas desulfurization, solving the problems of low desulfurization efficiency, difficult energy consumption balance, large absorption zone resistance, and high operation cost in the prior art.

[0025] An efficient seawater desulfurization device, comprising an absorption tower flue gas inlet, an absorption tower shell, and an absorption tower flue gas outlet, wherein filler layer support grilles, a first filler layer, a second filler layer, a spraying layer, and a demister are sequentially arranged in the absorption tower from bottom to top.

[0026] The first filler layer is formed by randomly stacking irregular fillers, and the filler layer height is 1000-4500mm.

[0027] The second filler layer is formed by regularly stacking structured fillers, and the filler layer height is 500-3000mm.

[0028] The height ratio of the first filler layer to the second filler layer is 0.3-9.0.

[0029] The porosity of the structured fillers used in the second filler layer is not less than 60%, and the porosity ratio of the first filler layer to the second filler layer is 0.6-1.5.

[0030] The distance from the second filler layer to the spraying layer is 1000-3000mm, and the distance from the bottom of the first filler layer to the upper edge of the absorption tower flue gas inlet is 1000-3000mm.

[0031] The flue gas enters from the absorption tower flue gas inlet, is first subjected to SO2 preliminary removal in the first filler layer formed by randomly stacking irregular fillers, and then passes through the second filler layer formed by regularly stacking structured fillers, so that the resistance is reduced, the SO2 removal efficiency is continuously improved, the flue gas resistance is reduced, and the energy consumption and operation cost of the seawater flue gas desulfurization absorption tower are reduced. The second layer of structured fillers is installed in the form of a cylindrical body or a rectangular body, which can prevent and reduce the risk of liquid flooding in the absorption tower.

[0032] Embodiment 2

[0033] As Figure 1 shown, based on embodiment 1, this embodiment provides a more detailed implementation mode.

[0034] The efficient seawater desulfurization device comprises a flue gas inlet 1 of an absorption tower, an absorption tower shell 3, a flue gas outlet 4 of the absorption tower, and a packing layer support grid 211, a first packing layer 212, a second packing layer 213, a spraying layer 22, and a demister 23 arranged in the absorption tower from bottom to top in sequence.

[0035] Taking a seawater desulfurization project of a certain coal-fired unit as an example,

[0036] According to the utility model, the diameter of the absorption tower is 16000mm, the first packing layer is filled with PP snowflake-shaped loose packing, the porosity of the packing layer is 60%, and the height is 2500mm; the second packing layer is filled with grid-shaped regular packing, the porosity of the packing layer is 80%, and the height is 1500mm. The second packing layer is 2000mm away from the spraying layer along the distance, and the bottom of the first packing layer is 1500mm away from the flue gas inlet of the absorption tower along the distance. The grid-shaped regular packing of the second layer is installed into a cylindrical whole packing layer with a diameter of 16000mm and a height of 1500mm, so that the risk of liquid flooding of the absorption tower can be effectively prevented.

[0037] The seawater is sprayed into the absorption tower through the spraying layer for desulfurization, the seawater desulfurization efficiency is 99.5%, and the SO2 emission concentration of the clean flue gas is better than the ultra-low emission limit value 35mg / Nm 3 , and the resistance of the absorption tower is 750Pa.

[0038] Comparative example 1:

[0039] According to the conventional packing layer technology, the diameter of the absorption tower is 16000mm, the packing layer is filled with PP snowflake-shaped loose packing, the porosity of the packing layer is 60%, the height is 4000mm, the upper edge of the packing layer is 2000mm away from the spraying layer, and the bottom of the packing layer is 1500mm away from the flue gas inlet of the absorption tower. The seawater is sprayed into the absorption tower through the spraying layer for desulfurization, the seawater desulfurization efficiency is 99.5%, and the SO2 emission concentration of the clean flue gas is better than the ultra-low emission limit value 35mg / Nm 3 , and the resistance of the absorption tower is 900Pa.

[0040] The above shows that according to the utility model, the flue gas resistance of the absorption tower is 150Pa lower than that of the conventional single loose packing layer technology under the condition that the desulfurization efficiency remains unchanged, the operation energy consumption and cost of the absorption tower can be reduced, and the economy is better.

[0041] Comparative example 2:

[0042] The absorption tower has a diameter of 16000mm, the filler layer is filled with grid-shaped structured filler, the porosity of the filler layer is 80%, the height of the filler layer is 4000mm, the distance from the filler layer to the spraying layer is 2000mm, and the distance from the bottom of the filler layer to the upper edge of the flue gas inlet of the absorption tower is 1500mm.

[0043] The above shows that, by using the seawater desulfurization device, the desulfurization efficiency is increased by 1% compared with the absorption tower using the conventional single structured filler technology under the condition that the flue gas resistance is equivalent or increases less, the higher desulfurization efficiency can be met, and the lower SO2 emission can be realized.

[0044] In summary:

[0045] The seawater desulfurization device has higher desulfurization efficiency.

[0046] The partition design of the first filler layer and the second filler layer makes the seawater desulfurization device more economical and reliable, and the resistance in the absorption area is low.

[0047] As described above, the utility model can be better realized.

[0048] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form, and according to the technical essence of the utility model, any simple modification, equivalent replacement and improvement of the above embodiment still belongs to the protection scope of the utility model technical scheme within the spirit and principles of the utility model.

Claims

1. A seawater desulfurization apparatus, characterized by comprising: The application relates to a flue gas absorption tower, which comprises a flue gas absorption tower shell (3), a flue gas absorption tower flue gas inlet (1) and a flue gas absorption tower flue gas outlet (4) arranged on the flue gas absorption tower shell (3), wherein the flue gas absorption tower flue gas inlet (1) is arranged below the flue gas absorption tower flue gas outlet (4), the flue gas absorption tower flue gas inlet (1) and the flue gas absorption tower flue gas outlet (4) are communicated with the internal space of the flue gas absorption tower shell (3), a first filler layer (212), a second filler layer (213), a spraying layer (22) and a demister (23) are sequentially arranged in the internal space of the flue gas absorption tower shell (3) from bottom to top, and the first filler layer (212) is arranged above the flue gas absorption tower flue gas inlet (1).

2. A seawater desulfurization apparatus according to claim 1, wherein The application further comprises a filler layer support grid (211) arranged in the internal space of the flue gas absorption tower shell (3), wherein the filler layer support grid (211) is arranged below the first filler layer (212) and above the flue gas absorption tower flue gas inlet (1).

3. A seawater desulfurization apparatus according to claim 1, wherein The height of the first filler layer (212) is 1000-4500 mm.

4. A seawater desulfurization apparatus according to claim 1, wherein The height of the second filler layer (213) is 500-3000 mm.

5. A seawater desulfurization apparatus according to claim 1, wherein The height ratio of the first filler layer (212) to the second filler layer (213) is 0.3-9.

0.

6. A seawater desulfurization apparatus according to claim 1, wherein The porosity of the filler of the second filler layer (213) is greater than or equal to 60%.

7. A seawater desulfurization apparatus according to claim 1, wherein The porosity ratio of the first filler layer (212) to the second filler layer (213) is 0.6-1.

5.

8. A seawater desulfurization apparatus according to claim 1, wherein The distance between the top of the second filler layer (213) and the bottom of the spraying layer (22) is 1000-3000 mm.

9. A seawater desulfurization apparatus according to claim 1, wherein The vertical distance between the bottom of the first filler layer (212) and the upper edge of the flue gas absorption tower flue gas inlet (1) is 1000-3000 mm.

10. A seawater desulfurization device according to any one of claims 1 to 9, characterized in that, The filler of the first filler layer (212) is irregular filler, and the filler of the second filler layer (213) is regular filler.

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