Low-resistance high-performance gas lifting disc applied to desulfurized flue gas water lifting system

Abstract

The invention discloses a low-resistance and high-performance gas rising disc applied to a desulfurized flue gas water lifting system. The low-resistance and high-performance gas rising disc comprises a bottom plate, a gas rising pipe and a liquid collecting pipe, a plurality of smoke inlet holes and a plurality of condensate outlet holes are formed in the bottom plate; a gas rising pipe is installed above the flue gas inlet of the bottom plate, a top cover is arranged at the top of the gas rising pipe, gas outlets are formed in the front side wall and the rear side wall of the top cover respectively, and a plurality of layers of flue gas guide plates are arranged at the gas outlets obliquely downwards; and a liquid collecting pipe is connected below the condensate outlet hole of the bottom plate. By optimizing the bottom plate, discharge of condensate water is accelerated, liquid mixing / flooding is prevented, meanwhile, smoke is guided, and resistance generated when the smoke flows through is reduced; secondly, by means of the unique design of the top cover of the riser, the smoke is guided again when the smoke flows through the holes in the side wall of the riser, and resistance is reduced; and finally, through reasonable design and layout of the gas rising pipe, flow field distribution and reaction conditions of the flue gas in the water-lifting condensing tower are optimized, the performance of the gas rising disc is improved, and full contact of the flue gas and condensed water is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment, and in particular to a low-resistance and high-performance gas lifting disk applied to a desulfurization flue gas water lifting system. Background Art

[0002] In the desulfurization flue gas water extraction system, the aeration tray is the primary flue gas water recovery device. It improves water resource recovery by lowering flue gas temperature and reducing the water content in the flue gas. Furthermore, the aeration tray prevents cross-contamination of condensate with the desulfurization slurry. The optimized design of the aeration tray within the tower simultaneously achieves gas-liquid separation and water collection within the tower. Specifically, when ultra-low-emission saturated clean flue gas enters the cooling and condensing tower, it undergoes intense gas-liquid contact and mixing with the sprayed cooling circulating water through the aeration tray, achieving cooling. During this contact process, most of the fine droplets are captured and fall with the spray liquid, while the remaining droplets are captured in the upper demister layer, with a very small portion being discharged with the condensed clean flue gas. Simultaneously, the cooling circulating water is heated within the cooling and condensing tower, further removing small amounts of sulfur dioxide (SO2), sulfur trioxide (SO3), dust, and gypsum droplets remaining in the clean flue gas at the absorption tower outlet.

[0003] The aeration tray combines the desulfurization tower and condensation tower into one, streamlining the process flow and improving equipment integration and operational efficiency. Furthermore, the recovered circulating water and flue gas condensate, after treatment, can be used in the desulfurization system or other water points, achieving water resource recycling and reducing the power plant's water consumption. It can even achieve zero-makeup water operation. The aeration tray within the tower performs gas-liquid separation and collects water in the tower, allowing water to be recovered from the desulfurized flue gas for production operations.

[0004] The existing gas lift plate has defects such as cross-contamination of condensate and desulfurization slurry and large resistance when gas passes through. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a low-resistance and high-performance gas lifting disk for use in a desulfurization flue gas water lifting system.

[0006] The present invention discloses a low-resistance and high-performance gas lift plate applied to a desulfurization flue gas water lifting system, comprising: a bottom plate, a gas lift pipe and a liquid collecting pipe;

[0007] The bottom plate is provided with a plurality of smoke inlet holes and a plurality of condensate outlet holes;

[0008] The riser is installed above the smoke inlet of the bottom plate, the top of the riser is provided with a top cover, the front and rear side walls of the top cover are respectively provided with air outlets, and the air outlets are provided with multi-layer smoke guide plates obliquely downward;

[0009] The liquid collecting pipe is connected below the condensate outflow hole of the bottom plate.

[0010] As a further improvement of the present application, the shape of the riser pipe is rectangular, and the flue gas is discharged from the gas outlet.

[0011] As a further improvement of the present application, the top of the top cover is provided with upwardly extending liquid guide baffles, and the edges of the two sides of the top cover extend outwardly by a distance.

[0012] As a further improvement of the present application, the shape of the top cover is a V-shaped angle iron, with an angle of 120°-150°.

[0013] As a further improvement of the present application, the top of the top cover is provided with upwardly extending liquid guide baffles, and the edges of the two sides of the top cover extend outwardly by a distance.

[0014] As a further improvement of the present application, the top of the top cover is provided with upwardly extending liquid guide baffles, and the edges of the two sides of the top cover extend outwardly by a distance.

[0015] As a further improvement of the present application, the top of the top cover is provided with upwardly extending liquid guide baffles, and the edges of the two sides of the top cover extend outwardly by a distance.

[0016] As a further improvement of the present application, the top of the top cover is provided with upwardly extending liquid guide baffles, and the edges of the two sides of the top cover extend outwardly by a distance.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The present application optimizes the shape of the bottom plate of the riser disc, the shape of the top cover of the riser pipe, the optimization design and layout of the riser pipe, and the like, optimizes the flow field distribution and reaction conditions of the flue gas in the water-lifting condensing tower, controls the rising speed and distribution of the gas, improves the performance of the riser disc, ensures that the flue gas and the condensed water are in full contact, and finally effectively prevents "liquid stringing" and "liquid overflowing", while further removing a small amount of sulfur dioxide (SO2), sulfur trioxide (SO3), dust, and gypsum liquid droplets, and the like, remaining in the net flue gas at the outlet of the absorption tower, thereby further reducing the concentrations of sulfur dioxide, particulate matter (dust), and the like, under the condition of realizing ultra-low emission, significantly improving the environmental protection contribution value, and simultaneously treating SO3, eliminating the "blue smoke" effect of the chimney. After cooling, washing, and cooling and condensing, the emission indicators of the pollutants are further reduced compared with ultra-low emission, and the amount of recovered water is also considerable, thereby achieving significant water-saving, environmental protection, and economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The present application discloses a structure diagram of a riser disc;

[0020] Figure 2A perspective view of the draft tube disclosed by the present application;

[0021] Figure 3 A front view of the draft tube disclosed by the present application; Figure 2

[0022] Figure 4 An installation view of the draft tube disclosed by the present application;

[0023] Figure 5 A structural schematic view of the floor and the collecting tube disclosed by the present application.

[0024] In the figure:

[0025] 1, draft tube; 2, top cover; 3, air outlet; 4, liquid guide baffle; 5, flue gas guide plate; 6, flue gas inlet hole; 7, draft disc; 8, bottom plate; 9, condensate outlet hole; 10, collecting tube. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0027] The present application will be described in further detail below in combination with the drawings:

[0028] As Figures 1-5 ​As shown, the present application provides a low resistance high performance gas lift disc applied to the desulfurized flue gas water extraction system, mainly applied in the wet desulfurization process, which can improve the water resource recycling rate by reducing the flue gas temperature and reducing the water content in the flue gas, and the application of the gas lift disc can prevent the condensate from mixing with the desulfurization slurry, and the optimized design of the tower gas lift disc can realize gas-liquid separation and water collection in the tower; it specifically comprises: a bottom plate 8, a gas lift pipe 1 and a liquid collecting pipe 10; wherein a plurality of flue gas inlet holes 6 and a plurality of condensate outlet holes 9 are formed on the bottom plate 8, the flue gas inlet hole 6 of the bottom plate 8 is provided with the gas lift pipe 1, the top of the gas lift pipe 1 is provided with a top cover 2, the front and rear sidewalls of the top cover 2 are respectively provided with gas outlets 3, and a plurality of flue gas guide plates 5 are arranged along the downward inclined direction at the gas outlets 3; the condensate outlet hole 9 of the bottom plate 8 is connected with the liquid collecting pipe 10 below, which is used for discharging the condensate. Based on this, firstly, the bottom plate is optimized, which can accelerate the discharge of the condensed water to prevent liquid mixing / overflowing, and at the same time, the flue gas is guided to reduce the resistance when the flue gas flows through; secondly, the top cover of the gas lift pipe is designed in a unique way, so that when the flue gas flows through the hole in the side wall of the gas lift pipe, the flue gas is guided again to reduce the resistance; finally, through the reasonable design and layout of the gas lift pipe, the flow field distribution and reaction conditions of the flue gas in the water extraction condensing tower are optimized, the performance of the gas lift disc is improved, the flue gas and the condensed water are fully contacted, and finally the residual small amount of sulfur dioxide (SO2), sulfur trioxide (SO3), dust and gypsum droplets in the clean flue gas at the outlet of the absorption tower are further removed.

[0029] Specifically:

[0030] The bottom plate 8 of the present application is a circular plate, which is the same size as the diameter of the desulfurization tower or the water extraction tower, a plurality of flue gas inlet holes 6 and condensate outlet holes 9 are formed on the bottom plate 8, the flue gas enters the water extraction system through the flue gas inlet hole 6, and the collected condensate is discharged from the system through the condensate discharge hole 9. The gas lift pipe 1 is installed above the flue gas through hole 6 on the bottom plate 8, the top of the gas lift pipe 1 is provided with a top cover 2, the top of the top cover 2 is provided with upwardly extending liquid guide baffles 4 on the front and rear sides, which mainly function to make the condensed water falling on the top cover 2 flow downward in a fixed direction; the front and rear sidewalls of the top cover 2 are respectively provided with gas outlets 3, and the edges of the gas outlets 3 on the two sides of the top cover 2 are provided with flue gas guide plates 5 inclined downward, which are used for guiding the flue gas to avoid the condensed water falling on the top cover 2 from entering the desulfurization system through the gas outlets 3. The liquid collecting pipe 10 is installed below the condensate outlet hole 9 on the bottom plate 8, which mainly functions to discharge the condensed water from the system.

[0031] Furthermore, the riser 1 is rectangular in shape, and an air outlet 3 is provided on its side wall. Above the air outlet 3, there is a flue gas deflector 5 slanting downward along its upper edge, and the angle between the root of the flue gas deflector 5 and the horizontal direction is 30°; the above design can ensure that the collected condensed water will not be brought into the slurry pool at the bottom of the desulfurization tower through the flow of flue gas, and through the reasonable design of the air riser 7, it can be ensured that the condensed water does not splash into the air riser outlet 3, effectively preventing liquid cross-linking and flooding, while ensuring that the flue gas flows out of the air riser smoothly and evenly, and improving the reliability of the system.

[0032] Furthermore, upwardly extending liquid guide baffles 4 are provided on the top of both sides of the top cover of the riser 1, and the edges on both sides of the top cover extend outward for a distance; the above design helps to improve the stability and safety of the riser disc.

[0033] Furthermore, the top cover 2 of the riser 1 is designed to be V-shaped like an angle iron. Compared with the flat top cover of the conventional riser, when the flue gas flows upward through the conventional riser, the flue gas is prevented from directly hitting the top cover of the riser and the direction of the flue gas flow is changed. This not only reduces the impact of the flue gas on the top cover, but also greatly reduces the resistance of the flue gas during flow; at the same time, the V-shaped top cover design also helps to discharge the condensate on the top cover; in order to achieve better results, the angle of the bottom angle of the top cover is between 120° and 150°.

[0034] Further, if Figure 4 As shown, when the riser 1 on the base plate 8 is installed, the two adjacent rows of riser 1 are arranged high and low on the base plate 8 according to the direction of the air outlet 3; that is, the air outlets of the two adjacent rows of riser are arranged high and low. The above design can prevent the flue gas between the outlets of the two adjacent riser 1 from convective collision when the flue gas flows upward through the riser 1. While reducing the resistance of the flue gas flowing through the riser disk, it can also optimize the flow field distribution and reaction conditions of the flue gas in the water-lifting condensing tower, and control the rising speed and distribution of the gas. It should be noted that when the risers are arranged high and low, the bottom edge of the outlet of the high riser must be at least higher than the top edge of the outlet of the low riser to avoid direct collision of the flue gas at the outlets of the high and low risers.

[0035] Furthermore, to direct the condensate from the top cover 2, the bottom plate 8 between two adjacent rows of risers is V-shaped, with an angle between 120° and 150°. This means that condensate on the riser top cover is discharged into the V-shaped grooves on the bottom plate. This design not only allows the condensate to be quickly collected by the V-shaped grooves to the condensate outflow holes, ultimately draining it from the system via the collection pipes, but also, because of the V-shaped bottom plate, it further guides the smoke in the blind area between the two risers as it enters the system through the smoke inlet holes, reducing resistance as the smoke passes through the riser disc.

[0036] The advantages of the present invention are:

[0037] 1. Effectively prevent liquid stringing / liquid flooding: The present application optimizes the structure of the gas lift disc, ensuring that the saturated clean flue gas flows out of the gas lift disc evenly and uniformly, while improving the reliability of the system.

[0038] 2. Reduce energy consumption: The present application optimizes the shape and layout of the gas lift disc to reduce the resistance of the gas passing through, thereby reducing energy consumption and improving the energy efficiency of the system.

[0039] 3. High water lifting efficiency: The present application optimizes the flow field distribution and reaction conditions to optimize the water lifting process and improve the reaction efficiency of water lifting.

[0040] The above is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A low-resistance, high-performance gas lift plate used in a flue gas water extraction system for desulfurization, characterized in that: include: Base plate (8), riser (1) and liquid collecting pipe (10); The bottom plate (1) is provided with a plurality of smoke inlet holes (6) and a plurality of condensate outlet holes (9); The riser (1) is installed above the smoke inlet (6) of the bottom plate (8), a top cover (2) is provided on the top of the riser (1), and air outlets (3) are respectively provided on the front and rear side walls of the top cover (2), and a multi-layer smoke guide plate (5) is provided at the air outlet (3) along an oblique downward direction; The liquid collecting pipe (10) is connected below the condensate outflow hole (9) of the bottom plate (8).

2. The gas lift disk according to claim 1, characterized in that: The riser (1) is rectangular in shape, and smoke is discharged from the gas outlet (3).

3. The gas lift disk according to claim 1, characterized in that: Liquid-conducting baffles (4) extending upward are provided on the front and rear sides of the top of the top cover (2).

4. The gas tray according to claim 1, characterized in that The top cover (2) is V-shaped, with an angle between 120° and 150°.

5. The gas tray according to claim 1, characterized in that: Above the air outlet (3), there is a smoke guide plate (5) that is inclined downward along the upper edge of the top cover (2), and the angle between the root of the guide plate (5) and the horizontal direction is 30 degrees.

6. The gas tray according to claim 1, characterized in that The directions of the two adjacent rows of riser pipes (1) on the bottom plate (8) are arranged in a high-low arrangement.

7. The gas tray according to claim 6, characterized in that When the risers (1) are arranged in high and low positions on the bottom plate (8), the lowermost edge of the air outlet of the higher riser must be at least higher than the uppermost edge of the air outlet of the lower riser.

8. The gas tray according to claim 1, characterized in that According to the discharge direction of the condensate on the top cover (2), the bottom plate (8) between two adjacent rows of riser pipes is V-shaped, and the angle is between 120° and 150°.

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