CN114288843B - Deposition-preventing circulating spraying system and process for wet desulfurization tower - Google Patents
Deposition-preventing circulating spraying system and process for wet desulfurization tower Download PDFInfo
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- CN114288843B CN114288843B CN202210124384.2A CN202210124384A CN114288843B CN 114288843 B CN114288843 B CN 114288843B CN 202210124384 A CN202210124384 A CN 202210124384A CN 114288843 B CN114288843 B CN 114288843B
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Abstract
The invention discloses a deposition-preventing circulating spraying system and a deposition-preventing circulating spraying process for a wet desulphurization tower, which comprise the following steps: the tower comprises a tower body, an inclined guide plate, an arc-shaped guide plate and a suction branch pipe array, wherein the inclined guide plate is arranged on the cross section of the tower body, and the outlet end of the inclined guide plate is obliquely arranged downwards relative to the cross section of the tower body; the upper end of the arc-shaped guide plate leans against the side wall of the tower body, the lower end of the arc-shaped guide plate is fixed at the bottom of the tower body, and the upper end of the arc-shaped guide plate is positioned below the outlet end of the inclined guide plate; the upper part of the bottom of the tower body is provided with the suction branch pipe array, and the suction branch pipe array is connected with the spraying layer through the circulating slurry pump group.
Description
Technical Field
The invention belongs to the technical field of wet desulphurization, and particularly relates to an anti-deposition circulating spray system and an anti-deposition circulating spray process for a wet desulphurization tower.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, wet flue gas desulfurization tower bottom disposes the circulation thick liquid pond, takes place to precipitate for the solid suspended solid that prevents in the circulation thick liquid pond, need set up the side formula agitator that prevents to precipitate and take place on absorption tower bottom outer wall usually, both increased investment and energy consumption, can not solve the deposit problem in absorption tower central zone again, still cause the side to advance the formula agitator in addition and take place the vibration wear in the installation region of tower wall.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an anti-deposition circulating spraying system and process for a wet desulphurization tower.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, the present invention provides an anti-deposition cyclic spraying system for a wet desulphurization tower, comprising: a tower body, an inclined guide plate, an arc guide plate and a suction branch pipe array, wherein,
the inclined guide plate is arranged on the cross section of the tower body, and the outlet end of the inclined guide plate is obliquely and downwards arranged relative to the cross section of the tower body;
the upper end of the arc-shaped guide plate leans against the side wall of the tower body, the lower end of the arc-shaped guide plate is fixed at the bottom of the tower body, and the upper end of the arc-shaped guide plate is positioned below the outlet end of the inclined guide plate;
the upper part of the bottom of the tower body is provided with the suction branch pipe array, and the suction branch pipe array is connected with the spraying layer through a circulating slurry pump group.
In a second aspect, the invention provides an anti-deposition circulating spraying method for a wet desulphurization tower, which comprises the following steps:
the desulfurization wastewater circularly sprayed by the spraying layer falls on the inclined guide plate after contacting and transferring mass with hot flue gas;
under the collecting and guiding effects of the inclined guide plate, the water flows down rapidly in large flow through the lower outlet of the inclined guide plate and falls on the arc-shaped guide plate;
under the flow guiding action of the arc-shaped flow guide plate, the slurry flows to the bottom of the tower body, and the slurry at the bottom of the tower body is disturbed;
and meanwhile, the slurry is sucked and circularly sprayed by adopting a suction branch pipe array arranged at the bottom of the tower body.
The beneficial effects achieved by one or more of the embodiments of the invention are as follows:
1) an inclined guide plate is arranged in the absorption tower, an arc guide plate is constructed on the tower wall opposite to a suction inlet of the circulating pump, the flow of slurry of the desulfurization circulating pump is utilized, a suction pipeline of the slurry circulating pump is utilized to configure a bottom suction branch pipe array, the flowing driving force of the slurry in the tower is generated, and the anti-deposition operation is completed on the basis of omitting a side-feeding stirrer, so that the problem of solid crystal deposition at the bottom of the wet absorption tower in the wet desulfurization operation process is solved; even when the system is restarted after being stopped, the suction branch pipe array can suck up the sediments step by step, and the suspension state of the slurry in the tower is quickly recovered. The setting mode can save equipment investment, maintenance cost and operation energy consumption for enterprises.
2) The equipment and the component configuration adopted by the system are all fixed, basically no maintenance is needed in the long-term operation process, the system has the obvious advantage in the aspect of operation stability, and can be used as a replacement and upgrading scheme of the existing absorption tower stirring facility.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention.
FIG. 1 is a schematic view of a wet desulfurization tower anti-settling recycle spray configuration in accordance with one or more embodiments of the present invention;
FIG. 2 is a schematic diagram of a circulation pump suction main arrangement according to one or more embodiments of the present invention;
FIG. 3 is a schematic view of the distribution of suction leg on a suction main in accordance with one or more embodiments of the present invention;
FIG. 4 is a schematic diagram of the configuration of the suction manifold on the suction main in accordance with one or more embodiments of the present invention;
FIG. 5 is a schematic view of the structure in the direction B-B in FIG. 4;
fig. 6 is a schematic view of a curved baffle.
In the figure: the mutual spacing or size is exaggerated to show the position of each part, and the schematic diagram is only used for illustration;
wherein, 1-a wet desulphurization tower; 2-suction main pipe; 3-an arc-shaped guide plate; 4-inclined baffles; 5-circulating the slurry tank; 6-circulating slurry pump group; 7-spraying layer group; 8-a demister; 9-a suction manifold; 10-arc diversion trench.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
In a first aspect, the present invention provides an anti-deposition cyclic spraying system for a wet desulphurization tower, comprising: a tower body, an inclined guide plate, an arc guide plate and a suction branch pipe array, wherein,
the inclined guide plate is arranged on the cross section of the tower body, and the outlet end of the inclined guide plate is obliquely and downwards arranged relative to the cross section of the tower body;
the upper end of the arc-shaped guide plate leans against the side wall of the tower body, the lower end of the arc-shaped guide plate is fixed at the bottom of the tower body, and the upper end of the arc-shaped guide plate is positioned below the outlet end of the inclined guide plate;
the upper part of the bottom of the tower body is provided with the suction branch pipe array, and the suction branch pipe array is connected with the spraying layer through the circulating slurry pump group.
In some embodiments the angle of inclination of the inclined deflector with respect to the cross-section of the tower is 15-55 deg., preferably 30-50 deg., even more preferably 45-50 deg..
Furthermore, a flow limiting edge is arranged at the outlet of the inclined guide plate.
Preferably, said flow restriction is arranged vertically with respect to the tower cross-section.
The flow limiting edge and the tower wall form a desulfurization waste water flow channel in a surrounding mode, a certain gathering effect is achieved on the desulfurization waste water flow channel, and the desulfurization waste water is prevented from being radially sprayed out at the outlet of the inclined guide plate. The desulfurization waste water is gathered and falls to the top of arc guide plate to when gathering down along the arc guide plate, can produce great impact, the thick liquid of tower body bottom can play the stirring effect betterly under this impact.
In some embodiments, a plurality of arc-shaped diversion grooves are arranged on the arc-shaped diversion plate.
Preferably, the outlet direction of the arc-shaped guide groove is obliquely arranged relative to the diameter of the tower body.
Further preferably, the outlet directions of the plurality of arc-shaped guide grooves are the same.
The export direction of arc guiding gutter sets up for tower body diameter slope, and the desulfurization waste water of the great velocity of flow that flows down can form the swirl at the bottom of the tower under the limiting displacement of tower inner wall, produces better stirring effect to the thick liquid at the bottom of the tower.
In addition, set up a plurality of arc guiding gutters on the arc guide plate, the desulfurization waste water that falls on the arc guide plate can assemble in the arc guiding gutter, forms the velocity of flow and the bigger fluid of impact force, and then can produce better stirring effect.
In some embodiments, the suction manifold array includes a suction main tube assembly disposed in a cross-over arrangement and a suction manifold assembly disposed on the suction main tube.
Preferably, one side of each main suction pipe is provided with two rows of branch suction pipes, and the two rows of branch suction pipes are symmetrically arranged relative to the symmetry plane of the main suction pipe.
Two rows of suction branch pipes are arranged on each suction main pipe, and the desulfurization wastewater sucked through the two rows of suction branch pipes can form impact turbulence in the suction main pipe so as to generate the effect of further uniform mixing.
In some embodiments, the end of each suction leg is provided with a reducing structure such that the end of the suction leg is flared.
Preferably, the inner diameter of the reducing structure is
The diameter reducing structure at the tail end of the suction branch pipe can improve the extraction force, when the caliber of the throat is small, the extraction force is large, but the caliber is too small, and liquid phase resistance is easy to cause.
Even if the suction branch pipes are arranged in an array, the bottom of the tower body cannot be completely covered, so that the tail ends of the suction branch pipes are arranged into a horn shape, the extraction coverage range of a single suction branch pipe can be effectively enlarged, and then the suction branch pipe array covers the bottom of the tower body as much as possible, so that the local deposition of solid particles at the bottom of the tower body is effectively reduced.
Preferably, the angle between the side wall of the end of the suction manifold and the central axis of the suction manifold is 15 to 70 °, preferably 30 to 60 °, more preferably 40 to 50 °. Within the range of the included angle, the drawing force of the suction branch pipe can be ensured, and the drawing range of the suction branch pipe can be effectively improved.
Preferably, the distance between the lowest end of the suction branch pipe and the bottom of the tower body is 50-300 mm. At such suction distances, the extraction capacity is strong and the coverage of the extraction is relatively large.
In some embodiments, the circulating slurry pump in the circulating slurry pump group is connected to a different suction main.
Preferably, the suction main pipes are communicated with each other. Ensuring that the slurry withdrawal capacity is maintained for all of the bottoms zone when one of the circulation pumps is off.
In a second aspect, the invention provides an anti-deposition circulating spraying method for a wet desulphurization tower, which comprises the following steps:
the desulfurization wastewater circularly sprayed by the spraying layer falls on the inclined guide plate after contacting and transferring mass with hot flue gas;
under the collecting and guiding effects of the inclined guide plate, the water flows down rapidly in large flow through the lower outlet of the inclined guide plate and falls on the arc-shaped guide plate;
under the flow guiding action of the arc-shaped flow guide plate, the slurry flows to the bottom of the tower body, and the slurry at the bottom of the tower body is disturbed;
and meanwhile, the slurry is sucked and circularly sprayed by adopting a suction branch pipe array arranged at the bottom of the tower body.
Hot flue gas, which is the object of wet desulfurization process, contains SO 2 The acidic pollutant gas substances inside are contacted with the circulating slurry sprayed from the spraying layer to generate a desulfurization reaction.
The circulating slurry is a solution medium containing desulfurizer, reaction by-products (such as gypsum) and the like which are easy to precipitate solid matters.
In the wet absorption tower, the circulating slurry sprayed out from the spraying layer falls into a bottom slurry pool after contacting with the flue gas, and is guided to one side of the absorption tower by an inclined guide plate; and then downward into the arc-shaped diversion trench arranged on the side, so that the slurry enters the arrangement area of the suction pipe of the circulating pump. This results in a continuous top-to-bottom flow of the circulating slurry within the circulating slurry tank, thereby eliminating any stagnant flow areas within the tower for the circulating slurry.
The invention is described in detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, a wet desulfurization tower system combining slurry circulation and agitation, wherein: the wet desulphurization tower 1 is a main device for wet desulphurization of flue gas, is used for installing a spray layer, a demister, a circulating slurry pool, an inclined guide plate, a circulating pump suction pipeline, an arc-shaped guide groove and the like, is used for providing a contact space between the flue gas and the circulating slurry to complete the wet desulphurization reaction, and has an inlet connected with the raw flue gas and an outlet connected with the clean flue gas;
the main suction pipe 2 is used for extracting the slurry in the circulating slurry tank of the absorption tower, overcoming the resistance and elevation resistance of a pipeline and driving the slurry to circulate, the inlet of the main suction pipe is communicated with the circulating slurry tank of the absorption tower, and the outlet of the main suction pipe is connected with the inlet of the spraying layer;
and the inclined guide plate 4 is positioned at the upper part of the circulating slurry pool of the desulfurization tower and is used for collecting circulating slurry falling from the spray layer of the absorption tower, guiding the circulating slurry into the inclined guide groove, forming a certain fall to generate certain impact force and guiding the circulating slurry into the arc-shaped guide groove. The angle of inclination is 15-55 deg. in relation to the cross-section of the tower. The outlet of the inclined guide plate 4 is provided with a flow-limiting edge. The inventor finds in the test process that if the inclination of the inclined guide plate 4 is set to be 15-55 degrees, the circulating slurry flowing downwards has certain impact force, so that the particles in the slurry cannot stay on the guide plate; the inclination is also related to three factors of the slurry circulation amount, the tower diameter and the slurry concentration, and the larger the slurry circulation amount is, the smaller the tower diameter is, the larger the downflow impact force generated by the same inclination is. The higher the slurry concentration, the greater the degree of tilt of the inclined baffle required. In the actual case, the inclination can be determined appropriately according to the above-described factors.
And the arc-shaped guide plate 3 is positioned at the lower part of the circulating slurry pool of the desulfurizing tower and used for guiding the downward impact force of the circulating slurry into inclined impact force so as to enable the circulating slurry to flow towards the suction pipe of the circulating pump. Set up a plurality of arc guiding gutters on the arc guide plate, the desulfurization waste water that falls on the arc guide plate can assemble in the arc guiding gutter, forms the velocity of flow and the bigger fluid of impact force, and then can produce better stirring effect.
And the circulating slurry pool 5 is positioned at the lower part of the absorption tower and is used for storing the circulating slurry.
And the slurry circulating pump unit 6 is used for extracting circulating slurry stored in the absorption tower, the inlet of the slurry circulating pump unit is connected with the main suction pipe 2, the outlet of the slurry circulating pump unit is connected with the spraying layer group of the desulfurization tower, and the circulating slurry and inlet flue gas are driven to generate desulfurization reaction. The main suction pipes of all the circulating pumps are communicated with each other, so that the slurry pumping capacity of all the tower bottom areas is maintained when one circulating pump is stopped.
And the spraying layer 8 is positioned in the upper space of the circulating slurry pool of the absorption tower and is used for atomizing the circulating slurry to ensure that the circulating slurry is fully contacted with the original flue gas. The inlet of the absorption tower is communicated with the absorption tower circulating slurry pump, and the outlet of the absorption tower is a spraying area of the absorption tower. And the spraying layer group comprises nozzles, the inlets of the nozzles are connected with the outlets of the slurry circulating pumps, and sprayed circulating slurry falls into a circulating slurry pool at the bottom of the absorption tower.
As shown in fig. 2, the suction branch pipes 9 of the circulation pump suction main pipe 2 are provided with trumpet-shaped suction ports and are symmetrically arranged at both sides of the bottom of the suction main pipe 2. The more uniform the arrangement state of the main suction pipe 2 and the branch suction pipe 9 in the tower, the better the effect of extracting the circulating slurry at the bottom of the absorption tower.
The suction branch pipe 9 generates upward suction through reducing the diameter of the throat, and realizes the extraction of the circulating slurry in the bottom plate area.
The invention is based on the physical principle that 'the slurry circulating pump generates suction force', generates upward suction force to the bottom slurry through the suction branch pipe with the bell mouth, and collects the bottom slurry to the circulating pump suction main pipe, thereby realizing the flow of the slurry, preventing the slurry from generating stagnation and realizing the suspension of the slurry. The process is characterized in that the flow of a circulating pump is used, so that the slurry circulation and the slurry suspension are organically combined, and the traditional side-feeding stirrer or other suspension devices are replaced.
The combined process operation is realized by adopting three operation steps: (1) after the circulating slurry falling from the spraying layer is used for desulfurizing the hot flue gas, the hot flue gas is obliquely led downwards through the inclined guide plate to form a certain downward impact force; (2) the circulating slurry is flushed into the arc diversion trench arranged below, so that the impact direction of the circulating slurry is guided to the suction main pipe/branch pipe arrangement area of the circulating pump. (3) The suction branch pipe pumps and collects the slurry in the suction main pipe of the circulating pump, and then the slurry is pressurized by the slurry circulating pump, so that the continuous circulating flow of the circulating slurry is realized, and the deposition of the solid at the bottom is eliminated.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (19)
1. The utility model provides a deposit circulation spray system is prevented to wet flue gas desulfurization tower which characterized in that: the method comprises the following steps: a tower body, an inclined guide plate, an arc guide plate and a suction branch pipe array, wherein,
the inclined guide plate is arranged on the cross section of the tower body, and the outlet end of the inclined guide plate is obliquely and downwards arranged relative to the cross section of the tower body;
the upper end of the arc-shaped guide plate leans against the side wall of the tower body, the lower end of the arc-shaped guide plate is fixed at the bottom of the tower body, and the upper end of the arc-shaped guide plate is positioned below the outlet end of the inclined guide plate;
the upper part of the bottom of the tower body is provided with the suction branch pipe array, and the suction branch pipe array is connected with the spraying layer through the circulating slurry pump group.
2. The anti-settling circulating spray system of a wet desulfurization tower of claim 1, wherein: the inclined angle of the inclined guide plate relative to the cross section of the tower body is 15-55 degrees; and a flow-limiting edge is arranged at the outlet of the inclined guide plate.
3. The anti-settling circulating spray system of a wet desulfurization tower of claim 2, wherein: the inclined angle of the inclined guide plate relative to the cross section of the tower body is 30-50 degrees.
4. The anti-settling circulating spray system of a wet desulfurization tower of claim 2, wherein: the inclined angle of the inclined guide plate relative to the cross section of the tower body is 45-50 degrees.
5. The anti-settling circulating spray system of a wet desulfurization tower of claim 2, wherein: the flow-limiting edge is arranged vertically with respect to the cross-section of the tower.
6. The anti-settling circulating spray system of a wet desulfurization tower of claim 1, wherein: a plurality of arc-shaped guide grooves are formed in the arc-shaped guide plate.
7. The anti-settling circulating spray system of a wet desulfurization tower of claim 6, wherein: the outlet direction of the arc-shaped diversion trench is obliquely arranged relative to the diameter of the tower body.
8. The anti-settling circulating spray system of a wet desulfurization tower of claim 6, wherein: the outlet directions of the arc-shaped diversion trenches are the same.
9. The anti-settling circulating spray system of a wet desulfurization tower of claim 1, wherein: the suction branch pipe array comprises suction main pipe assemblies arranged in a crossed mode and suction branch pipe assemblies arranged on the suction main pipes.
10. The anti-settling circulating spray system of a wet desulfurization tower of claim 9, wherein: one side of each main suction pipe is provided with two rows of branch suction pipes which are symmetrically arranged relative to the symmetry plane of the main suction pipe.
11. The anti-settling circulating spray system of a wet desulfurization tower of claim 1, wherein: the end part of each suction branch pipe is provided with a reducing structure, so that the tail end of each suction branch pipe is trumpet-shaped.
12. The anti-settling cyclic spray system of a wet desulfurization tower of claim 11, wherein: the inner diameter of the reducing structure is 15-100 mm.
13. The anti-settling cyclic spray system of a wet desulfurization tower of claim 11, wherein: the included angle between the side wall of the tail end of the suction branch pipe and the central axis of the suction branch pipe is 15-70 degrees.
14. The anti-settling cyclic spray system of a wet desulfurization tower of claim 13, wherein: the included angle between the side wall of the tail end of the suction branch pipe and the central axis of the suction branch pipe is 30-60 degrees.
15. The anti-settling cyclic spray system of a wet desulfurization tower of claim 13, wherein: the included angle between the side wall of the tail end of the suction branch pipe and the central axis of the suction branch pipe is 40-50 degrees.
16. The anti-settling circulating spray system of a wet desulfurization tower of claim 1, wherein: the distance between the lowest end of the suction branch pipe and the bottom of the tower body is 50-300 mm.
17. The anti-settling circulating spray system of a wet desulfurization tower of claim 1, wherein: and circulating slurry pumps in the circulating slurry pump set are connected with different suction main pipes.
18. The anti-settling cyclic spray system of a wet desulfurization tower of claim 17, wherein: the suction main pipes are communicated with each other.
19. The anti-deposition circulating spraying method for the wet desulphurization tower is characterized by comprising the following steps: the method comprises the following steps:
the desulfurization wastewater circularly sprayed by the spraying layer falls on the inclined guide plate after contacting and transferring mass with hot flue gas;
under the collecting and guiding effects of the inclined guide plate, the water flows down rapidly in large flow through the lower outlet of the inclined guide plate and falls on the arc-shaped guide plate; under the flow guiding action of the arc-shaped flow guide plate, the slurry flows to the bottom of the tower body, and the slurry at the bottom of the tower body is disturbed;
and meanwhile, the slurry is sucked and circularly sprayed by adopting a suction branch pipe array arranged at the bottom of the tower body.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4184857A (en) * | 1976-04-05 | 1980-01-22 | Jgc Corporation | Stripping column and process for removal of volatile matter |
| CN202654922U (en) * | 2012-04-10 | 2013-01-09 | 河北国惠环保科技有限公司 | Smoke desulfurizing tower for preventing bottom suspended solids from depositing |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0533828U (en) * | 1991-10-17 | 1993-05-07 | 石川島播磨重工業株式会社 | Absorption tower of flue gas desulfurization equipment |
| CN202087233U (en) * | 2011-06-03 | 2011-12-28 | 北京中科创新园环境技术有限公司 | Double-suction type disturbance device for desulfurizing tower |
| CN102489219B (en) * | 2011-11-30 | 2013-07-24 | 江苏揽山环境科技有限公司 | Butterfly-shaped anti-depositing member |
| CN208583178U (en) * | 2018-06-15 | 2019-03-08 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of anti-deposition disturbance device of wet desulfuration tower tower bottom |
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- 2022-02-10 CN CN202210124384.2A patent/CN114288843B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4184857A (en) * | 1976-04-05 | 1980-01-22 | Jgc Corporation | Stripping column and process for removal of volatile matter |
| CN202654922U (en) * | 2012-04-10 | 2013-01-09 | 河北国惠环保科技有限公司 | Smoke desulfurizing tower for preventing bottom suspended solids from depositing |
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Denomination of invention: A circulating spray system and process for preventing deposition of wet desulfurization tower Effective date of registration: 20221228 Granted publication date: 20220916 Pledgee: Qilu bank Limited by Share Ltd. Ji'nan Changqing branch Pledgor: SHANDONG GUOSHUN CONSTRUCTION GROUP Co.,Ltd. Registration number: Y2022980029384 |
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