Spiral-flow type gas-liquid mass transfer assembly

Abstract

The utility model discloses a spiral-flow type gas-liquid mass transfer assembly, which belongs to the technical field of flue gas desulfurization, and comprises a first support piece assembled on the inner wall of an absorption tower, a second support piece assembled on the inner wall of the absorption tower, and a third support piece assembled on the inner wall of the absorption tower, the inner cylinder component is assembled on the first supporting piece and extends in the vertical direction, and a first interval is defined in the inner cylinder component; the outer cylinder component is assembled on the outer side of the inner cylinder component, and a second interval is defined between the inner cylinder component and the outer cylinder component; a blade assembly. By designing a mass transfer assembly composed of an inner cylinder component, an outer cylinder component, a first blade group and a second blade group, based on different rotation directions of the first blade group and the second blade group, when slurry flows through the mass transfer assembly, flue gas in the assembly is fully contacted and mixed with the slurry, the flue gas retention time is prolonged, the gas-liquid contact area is increased, and the liquid-gas ratio is reduced; and the utilization rate of CaCO3 is improved, so that the flow and energy consumption of a circulating pump are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas desulfurization, and specifically relates to a cyclonic gas-liquid mass transfer component. Background Art

[0002] After achieving ultra-low emissions in coal-fired power plants, some power plants are facing the problems of increased sulfur content in coal and large load fluctuations, which bring difficulties to the adjustment and control of ultra-low SO2 emissions and energy saving of desulfurization systems. It is necessary to continue to explore the energy efficiency of desulfurization equipment to reduce the operating cost of desulfurization while meeting ultra-low emission requirements. Usually, the main ways to improve the efficiency of wet desulfurization are to adjust the pH value of the slurry pool, increase the liquid-gas ratio, and strengthen the three-phase reaction system in the spray tower. Strengthening the three-phase reaction system in the absorption tower is to increase the equal flow efficiency components inside the tower by adding equal flow efficiency components and optimizing the nozzle layout, so as to strengthen the convective mass transfer effect between the slurry and the flue gas and improve the desulfurization efficiency in the tower.

[0003] At present, the mainstream flue gas desulfurization flow equalization efficiency improvement components in China mainly include perforated plate mass transfer components and tube grid mass transfer components, but the CaCO3 utilization rate is not high, the desulfurization efficiency is low, and the circulation pump flow and energy consumption are high. Utility Model Content

[0004] The utility model aims to provide a cyclonic gas-liquid mass transfer component to solve the problems of the existing mass transfer components in the use process proposed in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical solution: a cyclonic gas-liquid mass transfer component, the mass transfer component is installed between the air inlet and the spray layer of the absorption tower, and comprises:

[0006] A first support member, mounted on the inner wall of the absorption tower;

[0007] An inner cylinder member, assembled on the first support member and extending in a vertical direction, wherein a first section is defined in the inner cylinder member;

[0008] an outer tube member, mounted outside the inner tube member and defining a second section between the inner tube member and the outer tube member;

[0009] The blade assembly includes a first blade group arranged in the first interval and a second blade group arranged in the second interval. The first blade group and the second blade group are both composed of a plurality of blade components arranged in a circular array, and the blade components constituting the first blade group and the second blade group have opposite rotation directions.

[0010] Preferably, the individual blade members in the first blade group and the second blade group are both arranged obliquely, and the inclination directions of the individual blade members in the first blade group and the second blade group are opposite.

[0011] Preferably, the mass transfer assembly further comprises a flow guide cylinder extending along the axis of the inner cylinder member.

[0012] Preferably, the top of the guide cylinder is a cone.

[0013] Preferably, the first support member is a rectifying grid.

[0014] Preferably, the mass transfer assembly further comprises a second support member disposed above the inner cylinder member.

[0015] Preferably, the second support member is a metal perforated plate.

[0016] Preferably, the cross-sections of the inner tube member and the outer tube member are both regular hexagons.

[0017] Preferably, the inner cylinder member and the outer cylinder member have different cross sections.

[0018] Preferably, the bottom section of the absorption tower is a slurry pool, the slurry pool is connected to the spray layer through a pipeline, and a circulation pump is provided on the pipeline.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] The present application designs a mass transfer component consisting of an inner cylinder component, an outer cylinder component, a first blade group and a second blade group. Based on the different rotation directions of the first blade group and the second blade group, when the slurry flows through the mass transfer component, the flue gas in the component is fully contacted and mixed with the slurry, thereby extending the residence time of the flue gas, increasing the gas-liquid contact area, reducing the liquid-to-gas ratio, and improving the utilization rate of CaCO3, thereby reducing the flow rate and energy consumption of the circulation pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the absorption tower system structure;

[0022] Figure 2 is a schematic diagram of the blade assembly structure;

[0023] Figure 3 is a schematic diagram of a cross section of a mass transfer component;

[0024] Figure 4 It is a front view schematic diagram of the mass transfer component.

[0025] In the figure:

[0026] 10. Absorption tower; 101. Air inlet; 102. Air outlet; 103. Slurry pool;

[0027] 20. Circulation pump;

[0028] 30. mass transfer assembly; 300. first support member; 301. inner cylinder member; 302. outer cylinder member; 303. second support member; 304. flow guide cylinder; 305. first interval; 306. second interval; 307. blade assembly; 308. first blade group; 309. second blade group;

[0029] 40. Spray layer. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] A cyclonic gas-liquid mass transfer assembly 30 (hereinafter referred to as mass transfer assembly 30), which is installed between the inlet of the absorption tower 10 and the spray layer 40, is used for flue gas flow and enhancing gas-liquid mixed mass transfer. Figure 1 The absorption tower 10 system includes an absorption tower 10, a circulation pump 20, a spray layer 40 and a mass transfer component 30, wherein a mass transfer interval is defined in the absorption tower 10, and an air inlet 101 and an air outlet 102 connected to the mass transfer interval are provided, the spray layer 40 and the mass transfer component 30 are both arranged in the mass transfer interval, and the mass transfer component 30 is located between the air inlet 101 and the spray layer 40, at the same time, the bottom interval of the absorption tower 10 is constituted as a slurry pool 103, and the circulation pump 20 is connected to the spray layer 40 and the slurry pool 103 through a pipeline, when the absorption tower 10 system is working, the slurry in the slurry pool 103 flows into the spray layer 40 under the action of the circulation pump 20 and is sprayed downward, at the same time, the flue gas enters the mass transfer interval from the air inlet 101 and flows upward, the flue gas flowing upward and the slurry flowing downward are contacted and mixed in the mass transfer component 30, and the sulfur dioxide in the flue gas is absorbed and discharged from the air outlet 102.

[0032] In some embodiments, reference Figure 3 and 4 The mass transfer assembly 30 is mainly composed of a first support 300, an inner cylinder component 301, an outer cylinder component 302 and a blade component 307, wherein the first support 300 is mounted on the inner wall of the absorption tower 10 and serves as a mounting carrier for the inner cylinder component 301 and the outer cylinder component 302, and an opening for the flue gas to pass through is provided on the first support 300. In some embodiments, the first support 300 is configured as a rectifying grid. Figure 3 and 4, continue to explain the mass transfer component 30, the inner cylinder member 301 is installed on the first support member 300 and is vertically arranged, and a first interval 305 is defined in the inner cylinder member 301, and the outer cylinder member 302 is arranged on the periphery of the inner cylinder member 301, and a second interval 306 is defined between the inner cylinder member 301 and the outer cylinder member 302. Correspondingly, the blade assembly 307 includes a first blade group 308 arranged in the first interval 305 and a second blade group 309 arranged in the second interval 306. The first blade group 308 and the second blade group 309 are both composed of a plurality of blade members arranged in an annular array, and the blade members constituting the first blade group 308 and the second blade group 309 have opposite rotation directions. Specifically, refer to Figure 2 The individual blade components constituting the first blade group 308 and the second blade group 309 are arranged tilted, that is, the angle between the surface of the individual blade component and the horizontal plane is an acute angle, and the tilt directions of the individual blade components constituting the first blade group 308 and the second blade group 309 are opposite.

[0033] Back to Figure 3 Continuing to explain the mass transfer component 30, the mass transfer component 30 also includes a guide cylinder 304, which is arranged along the axis of the inner cylinder member 301 and constitutes a mounting carrier of the first blade group 308. In some embodiments, the top of the guide cylinder 304 is configured as a cone to divert the slurry sprayed from the spray layer 40.

[0034] Reference Figure 4 The mass transfer assembly 30 further includes a second support member 303, which is disposed above the inner cylinder member 301. In some embodiments, the second support member 303 is configured as a metal perforated plate to allow flue gas and slurry to pass through.

[0035] When the absorption tower 10 system is in operation, the slurry drawn from the slurry pool 103 at the bottom of the absorption tower 10 is transported to the spray layer 40 through the circulation pump 20, and the slurry sprayed from the spray layer 40 falls onto the mass transfer component 30. The slurry is distributed to the blade component 307 (i.e., the first blade group 308 and the second blade group 309) through the guide cylinder 304. The flue gas enters from the first support member 300, and the rectified flue gas enters the lower part of the mass transfer component 30, and enters the first interval 305 and the second interval 306 respectively. After the slurry on the blades is swirl-flowed by the blade component, it is blown away and mixed. Under the centrifugal force of the swirling flue gas, the mixed slurry is blown away. The liquid droplets reach the inner walls of the inner cylinder component 301 and the outer cylinder component 302, and flow into the slurry pool 103 at the bottom of the absorption tower 10 through the gaps in the flow channel of the blade component under the action of gravity. After part of the slurry is carried out of the mass transfer component 30 by the flue gas, it falls above the second support member 303. The sealing plate is a metal perforated plate, and the slurry enters the slurry pool 103 at the bottom of the absorption tower 10 through the small holes on the metal perforated plate. In the process of the slurry flowing through the mass transfer component 30, the flue gas in the component is fully contacted and mixed with the slurry, which prolongs the residence time of the flue gas, increases the gas-liquid contact area, reduces the liquid-gas ratio, and improves the utilization rate of CaCO3, thereby reducing the flow rate and energy consumption of the circulation pump 20.

[0036] In some embodiments, the number of installation layers of the blade components, the radial angle and elevation angle of each layer, and the number of blades are calculated and determined based on the actual situation of the project.

[0037] In some embodiments, the outer shapes of the inner cylinder member 301 and the outer cylinder member 302 are determined according to the project design, and can be circular, polygonal or other regular shapes, for example.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cyclonic gas-liquid mass transfer component, characterized in that: The mass transfer assembly is installed between the air inlet and the spray layer of the absorption tower, and includes: A first support member, mounted on the inner wall of the absorption tower; An inner cylinder member, assembled on the first support member and extending in a vertical direction, wherein a first section is defined in the inner cylinder member; an outer tube member, mounted outside the inner tube member and defining a second section between the inner tube member and the outer tube member; The blade assembly includes a first blade group arranged in the first interval and a second blade group arranged in the second interval. The first blade group and the second blade group are both composed of a plurality of blade components arranged in a circular array, and the blade components constituting the first blade group and the second blade group have opposite rotation directions.

2. A cyclonic gas-liquid mass transfer assembly according to claim 1, characterized in that: The individual blade components in the first blade group and the second blade group are both arranged obliquely, and the inclination directions of the individual blade components in the first blade group and the second blade group are opposite.

3. The cyclonic gas-liquid mass transfer assembly according to claim 1, characterized in that: The mass transfer assembly further includes a flow guide cylinder extending along the axis of the inner cylinder component.

4. A cyclonic gas-liquid mass transfer assembly according to claim 3, characterized in that: The top of the flow guide cylinder is a cone.

5. The cyclonic gas-liquid mass transfer assembly according to claim 1, characterized in that: The first support member is a rectifying grid.

6. The cyclonic gas-liquid mass transfer assembly according to claim 1, characterized in that: The mass transfer assembly further includes a second support member disposed above the inner cylinder member.

7. A cyclonic gas-liquid mass transfer assembly according to claim 6, characterized in that: The second supporting member is a metal perforated plate.

8. The cyclonic gas-liquid mass transfer assembly according to claim 1, characterized in that: The cross sections of the inner and outer cylinder members are both regular hexagonal.

9. The cyclonic gas-liquid mass transfer assembly according to claim 1, characterized in that: The inner and outer cylinder members have different cross sections.

10. The cyclonic gas-liquid mass transfer assembly according to claim 1, characterized in that: The bottom section of the absorption tower is a slurry pool, which is connected to the spray layer through a pipeline, and a circulation pump is provided on the pipeline.

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