A gas-liquid mass transfer device for an adaptive desulfurization spray tower

Abstract

The present invention discloses a gas-liquid mass transfer device for an adaptive desulfurization spray tower, comprising a mass transfer module, a flow balancing plate, a flow balancing hole, a guide plate, a cofferdam, and a support column. The upper end of the support column is connected to the internal cofferdam of the flow balancing plate, and the lower end is connected to the upper plane of the guide plate. The main body of the mass transfer module is composed of the flow balancing plate, the support column, and the guide plate. The beneficial effects of the present invention are as follows: a gas-liquid mass transfer device for an adaptive desulfurization spray tower has the advantages of uniformly distributing flue gas and enhancing the gas-liquid mass transfer efficiency. When the liquid-gas ratio of the desulfurization absorption tower changes, the device has strong adaptive capabilities, thereby achieving the effect of efficient and energy-saving operation of the desulfurization system. The independence of the mass transfer module is coordinated and unified with the integrity of the gas-liquid mass transfer device, thereby improving the purpose of uniform distribution of flue gas in the desulfurization absorption tower.

Description

Technical Field

[0001] The invention relates to a gas-liquid mass transfer device, in particular to a gas-liquid mass transfer device for a self-adaptive desulfurization spray tower. Background Art

[0002] The composite technology for improving the gas-liquid mass transfer efficiency in the limestone-gypsum wet flue gas desulfurization process is clearly stated in the "Guidelines for Feasible Technologies for Pollution Prevention and Control in Thermal Power Plants" (HJ 2301-2017). It is generally based on an empty spray tower, with turbulent, tray, bubbling and other gas-liquid mass transfer devices installed above the inlet flue and below the spray layer, or between each spray layer.

[0003] Comparing the same design output, the theoretical basis for the empty spray tower is to increase the system's liquid-to-gas ratio. This increased slurry spray volume also leads to a corresponding increase in the desulfurization system's power consumption. Mainstream technologies for gas-liquid mass transfer devices include alloy trays and swirl coupling. Both technologies maintain the original system's liquid-to-gas ratio while forming a stable liquid retention layer, thereby improving the gas-liquid mass transfer efficiency as the flue gas passes through it. This technology can effectively control the desulfurization system's power consumption.

[0004] Disadvantages of existing technologies: The design principles of alloy trays and swirl coupling technologies are based on the conditions that the unit is running at full load and all slurry circulation pumps are in operation, and the gas-liquid mass transfer device below the spray layer can achieve a liquid holding layer of the designed height. The opening rate of the alloy tray is formed in one step, and the upper surface of the tray is divided into several blocks by a partition about 300mm high. It cannot be adjusted during production operation, and the unit can achieve efficient operation under high-load conditions. For power plants with low unit load rates, if some slurry circulation pumps are shut down, the system spray volume will be reduced, and at the same time, the flue gas flow rate in the absorption tower will be lower than the design value. The tray liquid holding layer cannot meet the designed height, or even has no liquid holding effect, resulting in a significant decrease in actual operating efficiency. The swirl coupler is assembled from mass transfer modules and evenly arranged at the bottom of the slurry spray layer. Because its mass transfer modules are all independently operated individuals, if the velocity field or spray volume in the absorption tower is poorly distributed, it will cause obvious instability factors in the operation of the desulfurization system. For power plants with low unit load rates, the flue gas flow rate in the absorption tower is lower than the design value, and the swirling flue gas is insufficient to achieve secondary atomization of the slurry or the atomization efficiency is very poor, resulting in the pneumatic unit being directly penetrated by the flue gas, rendering it useless. Summary of the Invention

[0005] The object of the present invention is to provide a gas-liquid mass transfer device for an adaptive desulfurization spray tower to solve the technical problem of being unable to effectively control the power consumption rate of a desulfurization plant.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] The present invention provides a gas-liquid mass transfer device for an adaptive desulfurization spray tower, comprising a mass transfer module, a flow balancing plate, a flow balancing hole, a guide plate, a cofferdam, and a support column, wherein the upper end of the support column is connected to the cofferdam inside the flow balancing plate, and the lower end is connected to the upper plane of the guide plate;

[0008] Specifically, the mass transfer module is a multi-layer structure, and the main body is composed of a flow balancing plate, a support column, and a guide plate;

[0009] Specifically, the mass transfer module is a mass transfer component made of corrosion-resistant and wear-resistant 2205 alloy steel or titanium alloy steel;

[0010] Specifically, the flow balancing plate is a circular prefabricated part, the inner and outer edges of which are cofferdams for accumulating slurry; the bottom of the flow balancing plate is evenly distributed with flow balancing holes, and the opening rate of the flow balancing plate is 30-35%;

[0011] Specifically, the support columns are evenly distributed along the circumference, and the opening rate of the cylindrical surface is the same as that of the flow balancing disk, which is 30-35%;

[0012] Specifically, the lower half of the guide plate is a spherical surface, and the upper half is a flattened spherical surface. The major diameter of the guide plate is larger than the flattened diameter of the spherical surface, and the flattened diameter of the spherical surface is the same as the inner diameter of the flow averaging plate.

[0013] Based on the above technical solution, the present invention can produce the following technical effects:

[0014] The purpose of the present invention is to provide a gas-liquid mass transfer device for an adaptive desulfurization spray tower, which enhances the flue gas uniformity and gas-liquid mass transfer efficiency while having a liquid holding function, and at the same time has the characteristics of adapting to changes in the load conditions of the unit. When the slurry circulation volume of the desulfurization absorption tower changes, a relatively stable liquid holding layer can be maintained to ensure the efficient and stable operation of the desulfurization absorption tower under full load conditions; the independence of the mass transfer module is coordinated and unified with the integrity of the gas-liquid mass transfer device, thereby improving the purpose of uniform distribution of flue gas in the desulfurization absorption tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention;

[0016] Figure 2 Schematic diagram of an embodiment of the present invention;

[0017] Figure 3 It is a top view of the present invention;

[0018] Figure 4 Schematic diagram of an embodiment of the present invention;

[0019] In the figure: 1. Mass transfer module; 2. Flow balancing plate; 3. Flow balancing hole; 4. Guide plate; 5. Cofferdam; 6. Support column. DETAILED DESCRIPTION

[0020] The present invention provides a gas-liquid mass transfer device for an adaptive desulfurization spray tower, comprising a mass transfer module 1, a flow balancing plate 2, a flow balancing hole 3, a flow guide plate 4, a cofferdam 5, and a support column 6. The upper end of the support column 6 is connected to the internal cofferdam of the flow balancing plate 2, and the lower end is connected to the upper plane of the flow guide plate 4.

[0021] Specifically, the mass transfer module 1 is a multi-layer structure, and the main body is composed of a flow plate 2, a support column 6, and a guide plate 4;

[0022] Specifically, the mass transfer module 1 is a mass transfer component made of corrosion-resistant and wear-resistant 2205 alloy steel or titanium alloy steel;

[0023] Specifically, the flow balancing plate 2 is a circular prefabricated part, the inner and outer edges of which are cofferdams 5 for accumulating slurry; the flow balancing holes 3 are evenly distributed on the bottom 2 of the flow balancing plate, and the opening rate of the flow balancing plate 2 is 30-35%;

[0024] Specifically, the support columns 6 are evenly distributed along the circumference, and the opening rate of the cylindrical surface is the same as that of the flow balancing plate 2, which is 30-35%;

[0025] Specifically, the lower half of the guide plate 4 is a spherical surface, and the upper half is a flattened spherical surface. The major diameter of the guide plate 4 is larger than the flattened diameter of the spherical surface, and the flattened diameter of the spherical surface is the same as the inner diameter of the flow balancing plate 2.

[0026] One embodiment of the present invention provides a gas-liquid mass transfer device for an adaptive desulfurization spray tower, which is applied to limestone-gypsum wet flue gas desulfurization processes. Like other gas-liquid mass transfer devices, it is installed in a cross-section above the inlet flue of the desulfurization absorption tower and below the spray layer. The gas-liquid mass transfer device is assembled from multiple mass transfer modules 1, all arranged in the same plane, supported at the bottom by load-bearing beams and without upper partitions, to achieve self-leveling of the slurry. Circumferential irregular areas can be filled with reduced mass transfer modules 1 or covered with gridded flat alloy steel plates with the same open area ratio of 30-35%.

[0027] One embodiment of the present invention is as follows: the spray slurry falls from top to bottom, and the equalizing plate 2 serves as the main collection area for the slurry. First, a slurry column is formed by self-flow from the equalizing hole 3. Excess slurry overflows from the inner edge of the equalizing plate 2 to the central tube of the support column 6, and forms a slurry flow on the upper part of the guide plate 2, thereby ensuring the high stability of the liquid holding layer. There are three main forms of flue gas passing from bottom to top: the flue gas flows vertically upward through the slurry flow and the slurry column, and escapes from the equalizing hole 3; the flue gas flow changes its flow direction at a small angle under the action of the guide plate, and then flows vertically upward through the slurry flow and the slurry column, and escapes from the equalizing hole 3. The flue gas flow changes its flow direction at a large angle under the action of the guide plate 4, and then passes through the slurry flow, changes its flow direction a second time, passes through the circumference of the support column 3, and escapes from the inner hole of the equalizing plate 4.

[0028] One embodiment of the present invention is that: under high-load conditions of the unit, the flue gas flow velocity in the desulfurization absorption tower is the highest. The larger the slurry circulation volume, the strongest the gas-liquid mass transfer efficiency, and the gas-liquid mass transfer mode is mainly based on Class I and Class II flue gas flows, followed by Class III flue gas flows; the slurry circulation volume decreases, and the three flue gas flow modes exist simultaneously, without primary or secondary distinction; under low-load conditions of the unit, the flue gas flow velocity in the desulfurization absorption tower decreases; the larger the slurry circulation volume, the gas-liquid mass transfer mode is mainly based on Class I and Class II flue gas flows. The slurry circulation volume decreases, and the gas-liquid mass transfer mode is mainly based on Class I and Class II flue gas flows, followed by Class III flue gas flows; in other words, the liquid-gas ratio is the design value, and the three flue gas flow modes exist simultaneously, without primary or secondary distinction; the actual operating liquid-gas ratio is less than the design value, and Class I and Class II flue gas flows are the main ones, followed by Class III flue gas flows; the actual operating liquid-gas ratio is greater than the design value, and Class I and Class II flue gas flows are the main ones.

[0029] The present invention includes but is not limited to the above embodiments. Any equivalent replacement or partial improvement made under the spirit and principle of the present invention shall be deemed to be within the protection scope of the present invention.

[0030] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gas-liquid mass transfer device for an adaptive desulfurization spray tower, characterized in that: The invention comprises a mass transfer module (1), wherein the mass transfer module (1) comprises a flow balancing plate (2), a flow balancing hole (3), a flow guide plate (4), a cofferdam (5), and a support column (6); the flow balancing plate (2) is a circular prefabricated part, and the inner and outer edges are cofferdams (5) for accumulating slurry; the flow balancing hole (3) is evenly distributed on the bottom of the flow balancing plate (2); the support columns (6) are evenly distributed along the circumference; the cylindrical surface opening rate of the support columns (6) is the same as the opening rate of the flow balancing plate (2); the lower half of the flow guide plate (4) is a spherical surface, and the upper half is a flattened spherical surface; the maximum diameter of the flow guide plate (4) is larger than the flattened spherical surface diameter, and the flattened spherical surface diameter is the same as the inner diameter of the flow balancing plate (2); the upper end of the support column (6) is connected to the inner cofferdam (5) of the flow balancing plate (2), and the lower end is connected to the upper plane of the flow guide plate (4).

2. The gas-liquid mass transfer device of the adaptive desulfurization spray tower according to claim 1, characterized in that: The mass transfer module (1) is a multi-layer structure, and its main body is composed of a flow balancing plate (2), a support column (6), and a flow guide plate (4).

3. The gas-liquid mass transfer device of the adaptive desulfurization spray tower according to claim 1, characterized in that: The mass transfer module (1) is a mass transfer component made of corrosion-resistant and wear-resistant 2205 alloy steel or titanium alloy steel.

4. The gas-liquid mass transfer device of the adaptive desulfurization spray tower according to claim 1, characterized in that: The opening rate of the flow balancing plate (2) is 30-35%.

5. The gas-liquid mass transfer device of the adaptive desulfurization spray tower according to claim 1, characterized in that: The cylindrical surface opening rate of the support column (6) is 30-35%.

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