Combined demisting device and desulfurizing absorption tower

Abstract

The utility model relates to a combined demisting device and a desulfurizing absorption tower, the combined demisting device is used for being installed in the desulfurizing absorption tower to remove particles in flue gas, the desulfurizing absorption tower comprises a flue gas inlet, a flue gas outlet located above the flue gas inlet and a flue gas channel located between the flue gas inlet and the flue gas outlet, the combined demisting device comprises a ridge type demister and a tubular demister, wherein the ridge type demister is positioned in the flue gas channel; the tubular demister is arranged in the desulfurizing absorption tower in a penetrating manner and comprises a water flowing pipeline positioned in the flue gas channel and below the ridge type demister, and a plurality of first spray holes facing the ridge type demister and a plurality of second spray holes facing the flue gas inlet are formed in the extension direction of the water flowing pipeline; the combined demisting device can reduce the residual scale on the ridge type demister and improve the interception capability of the ridge type demister on particulate matters in the flue gas, so that the flue gas is prevented from carrying excessive particulate matters and being discharged.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wet flue gas desulfurization, and particularly, to a combined demister and a desulfurization absorption tower. Background Art

[0002] In the related art, flue gas desulfurization usually adopts the method of wet desulfurization, that is, by spraying liquid to absorb sulfur dioxide in the flue gas to reduce environmental pollution. Existing wet desulfurization devices usually use a desulfurization absorption tower to absorb sulfur dioxide in the flue gas. An eliminator for absorbing particulate matter in the flue gas is usually provided in the desulfurization absorption tower to ensure that the discharged flue gas meets environmental protection standards. However, in the existing technology, two layers of chevron eliminators are usually used to absorb particulate matter in the flue gas. However, after the chevron eliminator is used for a long time, scaling and blockage are likely to occur on the plates and dead corners of the chevron eliminator, thereby affecting the demisting effect of the chevron eliminator, resulting in a large amount of particulate matter being carried by the flue gas and discharged, polluting the environment. Summary of the Utility Model

[0003] The purpose of the present disclosure is to provide a combined demister and a desulfurization absorption tower. The combined demister can reduce the residual scaling on the chevron eliminator, improve the interception ability of the chevron eliminator for particulate matter in the flue gas, so as to reduce the discharge of excessive particulate matter carried by the flue gas, and at least partially solve the above technical problems.

[0004] To achieve the above purpose, in the first aspect of the present disclosure, a combined demister is provided, which is used to be installed in a desulfurization absorption tower to remove particulate matter in the flue gas. The desulfurization absorption tower includes a flue gas inlet, a flue gas outlet located above the flue gas inlet, and a flue gas passage located between the flue gas inlet and the flue gas outlet. The combined demister includes: a chevron eliminator located in the flue gas passage; a tube demister penetrating through the desulfurization absorption tower and including a water pipe located in the flue gas passage and below the chevron eliminator. A plurality of first spray holes facing the chevron eliminator and a plurality of second spray holes facing the flue gas inlet are provided in the extending direction of the water pipe.

[0005] Optionally, a plurality of the water pipes are parallel to each other and arranged at intervals in the horizontal direction.

[0006] Optionally, the water pipe includes a first section, a second section located in the flue gas passage, and an intermediate section connected between the first section and the second section. A plurality of the first spray holes are provided in both the first section and the second section, and a plurality of the second spray holes are provided in the intermediate section.

[0007] Optionally, the hole pitch between any two adjacent first spray holes in the first section is 30 to 50 millimeters, and / or the hole pitch between any two adjacent first spray holes in the second section is 30 to 50 millimeters.

[0008] Optionally, the hole pitch between any two adjacent second spray holes is 50 to 100 millimeters.

[0009] Optionally, the length of the first section is 200 mm, and / or the length of the second section is 200 mm.

[0010] Optionally, the tubular demister further includes an atomizing nozzle connected to the first spray hole and / or the second spray hole.

[0011] Optionally, the distance between the tubular demister and the roof-type demister is not less than 1.5 meters.

[0012] Optionally, the number of the roof-type demisters is two layers, both layers of the roof-type demisters are located above the tubular demister, and the distance between the two layers of the roof-type demisters is not less than 1.5 meters.

[0013] In a second aspect of the present disclosure, there is provided a desulfurization absorption tower, including the combined demisting device according to any one of the above optional solutions.

[0014] Through the above technical solution, that is, the combined demisting device provided by the present disclosure, when desulfurizing the flue gas through the combined demisting device, the particulate matter in the flue gas from the inlet is mainly removed by the roof-type demister, and the tubular demister can spray the upper roof-type demister through the first spray hole on the water pipe, so as to wash the scale on the plates and dead corners of the roof-type demister, so as to reduce the residue of the scale on the roof-type demister, and coagulate the flue gas carrying slurry particulate matter entering from the inlet through the second spray hole, so that the slurry small particles become large particles, and then the interception ability of the roof-type demister for the particulate matter of the flue gas passing through the flue gas channel can be improved, so as to reduce the excessive particulate matter carried by the flue gas discharged into the external environment.

[0015] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification, and are used to explain the present disclosure together with the following specific implementation manners, but do not constitute a limitation to the present disclosure. In the drawings:

[0017] Figure 1 is a schematic structural diagram of the combined demisting device and the desulfurization absorption tower provided in the exemplary embodiment of the present disclosure;

[0018] Figure 2 is Figure 1 the schematic diagram in the A-A direction in

[0019] Figure 3 Schematic diagram of the structure of a tubular demister provided in an exemplary embodiment of the present disclosure.

[0020] Description of Reference Numerals

[0021] 1- ridge demister; 2- tubular demister; 210- water pipe; 211- first section; 212- second section; 213- middle section; 220- first spray hole; 230- second spray hole; 3- desulfurization absorption tower; 301- smoke inlet; 302- smoke outlet; 303- smoke channel. DETAILED DESCRIPTION

[0022] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0023] In the present disclosure, unless otherwise specified, directional words such as "inside" and "outside" refer to the inside and outside relative to the outline of the component or structure itself, and "first" and "second" are used to distinguish one element from another and have no order or importance. In addition, the same figure numbers in different reference drawings represent the same elements, and the same figure numbers in the same drawing also represent the same elements.

[0024] In a first aspect of the present disclosure, a combined demisting device is provided, referring to Figures 1 to 3 As shown, the combined defogger is used to be installed in a desulfurization absorption tower 3 to remove particulate matter in the flue gas. The desulfurization absorption tower 3 includes a smoke inlet 301, a smoke outlet 302 located above the smoke inlet 301, and a smoke channel 303 located between the smoke inlet 301 and the smoke outlet 302. The combined defogger includes a ridge-type defogger 1 and a tubular defogger 2. The ridge-type defogger 1 is located in the smoke channel 303; the tubular defogger 2 is penetrated by the desulfurization absorption tower 3 and includes a water pipe 210 located in the smoke channel 303 and below the ridge-type defogger 1. A plurality of first spray holes 220 facing the ridge-type defogger 1 are provided in the extension direction of the water pipe 210. The first spray holes 220 are used to spray the ridge-type defogger 1.

[0025] In the above - mentioned manner, that is, the combined demisting device provided by the present disclosure, when desulfurizing the flue gas through this combined demisting device, the particulate matter in the flue gas from the inlet 301 is mainly removed by the chevron demister 1. The tubular demister 2 can spray the upper chevron demister 1 through the first spray holes 220 on the water - passing pipeline 210, thereby flushing the scale on the plates and in the dead - angle area of the chevron demister 1, so as to reduce the residual scale on the chevron demister 1. And it coagulates the flue gas carrying slurry particulate matter entering from the inlet 301 through the second spray holes 230, turning the small slurry particles into large particles, thereby improving the interception ability of the chevron demister 1 for the particulate matter in the flue gas passing through the flue gas passage 303, and reducing the emission of excessive particulate matter carried by the flue gas into the external environment.

[0026] It should be noted that the supplementary description for the above - mentioned embodiments is as follows: In the related art, the chevron demister 1 is usually also equipped with a flushing pipeline capable of flushing its own plates. However, after the chevron demister 1 is used for a long time, although the scale remaining in the gaps between the plates of the chevron demister 1 can be flushed away by the flushing pipeline, the scale remaining at the edges and dead - angle areas of the chevron demister 1 still has a great impact on the demisting performance of the chevron demister 1. The embodiment mentioned in the above - mentioned embodiments of the present application is an improvement on the tubular demister 2, that is, flushing water is introduced into the water - passing pipeline 210, and the structures at the edges and dead - angle areas of the tubular demister 1 are flushed through multiple first spray holes 220, so as to further improve the absorption ability of the chevron demister 1 for particulate matter in the flue gas. And it coagulates in advance the flue gas carrying slurry particulate matter entering from the inlet 301 through the second spray holes 230, so that the small slurry particles become large particles and fall due to their own gravity. This can not only reduce the load on the chevron demister 1, but also further reduce the amount of particulate matter discharged from the outlet 302, improving the demisting effect on the flue gas. Moreover, the source of the flushing water inside the water - passing pipeline 210 can be the main flushing water header pipe, and this main flushing water header pipe can be connected to the above - mentioned flushing pipeline and the water - passing pipeline 210. That is, the flushing water for the plates of the chevron demister 1 itself and the water - passing pipeline 210 can share the same water source, thereby maximizing the utilization of water resources to improve the flushing effect on the chevron demister 1.

[0027] In some embodiments, referring to Figures 1 to 3 As shown, multiple water - passing pipelines 210 are parallel to each other and arranged at intervals in the horizontal direction. In this way, multiple water - passing pipelines 210 can not only spray and flush the structures at the edges and dead - angle areas of the chevron demister 1 through multiple first spray holes 220, but also play a role in evenly distributing the gas flow for the flue gas passing through the flue gas passage 303 through the gaps between the multiple water - passing pipelines 210, that is, it can combine Figure 1 andFigure 2 As shown, when the flue gas enters the flue gas passage 303 from the flue gas inlet 301, it will first pass through the lower tubular demister 2. The gaps between the multiple water pipes 210 allow the flue gas to pass through evenly and guide the flue gas more evenly to the upper ridged demister 1. Thus, the demisting function of the ridged demister 1 can be maximally utilized, enabling multiple plates in the ridged demister 1 to demist the flue gas.

[0028] In some embodiments, referring to Figures 1 to 3 As shown, the water pipe 210 includes a first section 211, a second section 212 located in the flue gas passage 303, and an intermediate section 213 connecting the first section 211 and the second section 212. Multiple first spray holes 220 are provided in both the first section 211 and the second section 212, and multiple second spray holes 230 are provided in the intermediate section 213. In this way, the first section 211 and the second section 212 are respectively located at the edges of the water pipe 210 in the flue gas passage 303. Setting multiple first spray holes 220 here can more conveniently wash the scale remaining at the edges and dead corners of the ridged demister. The multiple second spray holes 230 provided in the intermediate section 213 can spray towards the flue gas entering the flue gas passage 303 from the flue gas inlet 301 to coagulate the flue gas carrying slurry particles. After the slurry small particles are coagulated into large particles, they will naturally fall due to gravity, thereby reducing the content of particulate matter in the flue gas in advance and reducing the load on the upper ridged demister 1 of the tubular demister 2.

[0029] In some embodiments, referring to Figures 1 to 3 As shown, the hole distance between any two adjacent first spray holes 220 in the first section 211 is 30 - 50 mm, and / or the hole distance between any two adjacent first spray holes 220 in the second section 212 is 30 - 50 mm. With this arrangement, a hole distance of 30 - 50 mm can not only ensure the flushing efficiency of the ridged demister 1 but also avoid waste of water resources in the water pipe 210.

[0030] In some embodiments, referring to Figures 1 to 3 As shown, the hole distance between any two adjacent second spray holes 230 is 50 - 100 mm. With this arrangement, the hole distance of the second spray holes 230 is larger than that of the first spray holes 220, which can form a larger spraying area for the flue gas entering the flue gas passage 303 from the flue gas inlet 301, thereby improving the effect of pre-demisting the flue gas.

[0031] In some embodiments, the length of the first section 211 is 200 mm, and / or the length of the second section 212 is 200 mm. In this way, the first section 211 and / or the second section 212 with a length of 200 mm can be provided with a plurality of first spray holes 220 to form a larger spray area for the scaling at the edges and dead corners of the ridged demister 1, thereby improving the demisting effect of the ridged demister 1. For example, when the lengths of both the first section 211 and the second section 212 are 200 mm, the first spray holes 220 can be arranged at intervals of 30 to 50 mm as in the above embodiments. When the hole spacing is 30 mm, six first spray holes 220 can be arranged. When the hole spacing is 50 mm, at least three first spray holes 220 can be arranged. The specific number of the first spray holes 220 arranged can be selected according to the flushing efficiency of the ridged demister 1, and the present disclosure does not make specific limitations thereon.

[0032] In addition, in the above specific embodiments, in order to further improve the spraying effect of the plurality of first spray holes 220 on the first section 211 and the second section 212 on the ridged demister 1, both the first section 211 and the second section 212 are located in the flue gas passage 303, and one end of the first section 211 and the second section 212 close to the inner wall of the flue gas passage 303 can be kept at a distance of 300 mm to 500 mm from the inner wall of the flue gas passage 303. In this arrangement, the spraying effect of the first spray holes 220 on the edges and dead corners of the ridged demister 1 can be improved.

[0033] In some embodiments, the tubular demister 2 further includes atomizing nozzles (not shown in the figure) connected to the first spray holes 220 and / or the second spray holes 230. In this way, the atomizing nozzles can atomize the flushing water sprayed from the first spray holes 220 and the second spray holes 230 to make the flushing water into finer water droplets. The water droplets sprayed from the atomizing nozzles connected to the first spray holes 220 can improve the flushing effect on the ridged demister 1, and the water droplets sprayed from the atomizing nozzles connected to the second spray holes 230 can improve the coagulation effect with the particulate matter in the flue gas to improve the demisting effect. Moreover, in order to improve the flushing effect of the water droplets and the combination efficiency with the fine particles in the flue gas, the particle size of the atomized water droplets sprayed from the atomizing nozzles connected to the first spray holes 220 can be 1700 - 2300 μm, and the particle size of the atomized water droplets sprayed from the atomizing nozzles connected to the second spray holes 230 can be 500 - 800 μm.

[0034] In some embodiments, referring to Figures 1 to 3As shown, the distance between the tubular demister 2 and the roof demister 1 is not less than 1.5 meters. In this way, leaving a distance between the tubular demister 2 and the roof demister 1 can not only allow multiple first spray holes 220 on the water pipe 210 of the tubular demister 2 to wash the structure at the edge and dead angle of the roof demister 1 over a larger area, but also reserve a maintenance space for the staff to maintain the tubular demister 2 and the roof demister 1. For example, the distance between the tubular demister 2 and the roof demister 1 can be reasonably selected between 1.5 meters and 2 meters, as long as it can ensure that the staff can enter the space between the tubular demister 2 and the roof demister 1 for maintenance. The present disclosure does not make specific limitations on this.

[0035] In some embodiments, referring to Figures 1 to 3 As shown, the number of roof demisters 1 is two layers, and both layers of roof demisters 1 are located above the tubular demister 2, and the distance between the two layers of roof demisters 1 is not less than 1.5 meters. In this way, the two layers of roof demisters 1 can improve the removal effect of particulate matter in the flue gas in the flue gas passage 303. And in the related art, two layers of roof demisters 1 are also usually used to remove particulate matter in the flue gas to reduce the content of particulate matter in the flue gas before discharging. Also, a 1.5-meter maintenance space can be reserved between the two layers of roof demisters 1 to allow the staff to perform maintenance operations between the two layers of roof demisters 1.

[0036] In the second aspect of the present disclosure, a desulfurization absorption tower is provided. Referring to Figures 1 to 3 As shown, the desulfurization absorption tower includes the combined demisting device mentioned in the above specific embodiments, and this combined demisting device has all the beneficial effects of the above embodiments. When demisting the flue gas in the desulfurization absorption tower through this combined demisting device, the flue gas can be pre-sprayed by the tubular demister in the combined demisting device to pre-reduce the particulate matter in the flue gas, reduce the load on the roof demister 1, and spray and wash the edge and dead angle of the roof demister 1 to improve the demisting effect of the roof demister 1 on the flue gas, and finally ensure that the flue gas meets the emission standard and is discharged from the smoke outlet 302 of the desulfurization absorption tower 3.

[0037] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0038] In addition, it should be noted that, for the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

[0039] Furthermore, any combinations can be made among the various different embodiments of the present disclosure, as long as they do not violate the idea of the present disclosure, and they should equally be regarded as the content disclosed by the present disclosure.

Claims

1. A combined demisting device, used for installation in a desulfurization absorption tower to remove particulate matter in flue gas, the desulfurization absorption tower comprising a smoke inlet, a smoke outlet located above the smoke inlet, and a smoke channel located between the smoke inlet and the smoke outlet, characterized in that: The combined demisting device comprises: A ridge-type demister, located in the smoke passage; The tubular demister is installed in the desulfurization absorption tower and includes a water pipeline located in the flue gas channel and below the ridge demister. A plurality of first spray holes facing the ridge demister and a plurality of second spray holes facing the smoke inlet are arranged in the extension direction of the water pipeline.

2. The combined demisting device according to claim 1, characterized in that: The plurality of water pipes are parallel to each other and arranged at intervals in the horizontal direction.

3. The combined demisting device according to claim 2, characterized in that: The water pipeline includes a first section, a second section and a middle section connected between the first section and the second section, the first section and the second section are both provided with a plurality of the first spray holes, and the middle section is provided with a plurality of the second spray holes.

4. The combined demisting device according to claim 3, characterized in that: The hole distance between any two adjacent first spray holes in the first section is 30-50 mm, and / or the hole distance between any two adjacent first spray holes in the second section is 30-50 mm.

5. The combined demisting device according to claim 3, characterized in that: The hole distance between any two adjacent second nozzle holes is 50-100 mm.

6. The combined demisting device according to claim 3, characterized in that: The length of the first section is 200 mm, and / or the length of the second section is 200 mm.

7. The combined demisting device according to claim 3, characterized in that: The tubular demister further comprises an atomizing nozzle connected to the first spray hole and / or the second spray hole.

8. The combined demisting device according to claim 1, characterized in that: The distance between the tubular demister and the ridge demister is not less than 1.5 meters.

9. The combined demisting device according to claim 8, characterized in that: The number of the ridge-type demisters is two layers, and the two layers of the ridge-type demisters are both located above the tubular demisters, and the distance between the two layers of the ridge-type demisters is not less than 1.5 meters.

10. A desulfurization absorption tower, characterized in that: It comprises a combined demisting device as described in any one of claims 1 to 9.

Images