CN115212714A - Semi-dry desulfurization system with flue reactor and method - Google Patents
Semi-dry desulfurization system with flue reactor and method Download PDFInfo
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- CN115212714A CN115212714A CN202210814465.5A CN202210814465A CN115212714A CN 115212714 A CN115212714 A CN 115212714A CN 202210814465 A CN202210814465 A CN 202210814465A CN 115212714 A CN115212714 A CN 115212714A
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Abstract
The invention discloses a semi-dry desulfurization system with a flue reactor and a method thereof, comprising the flue reactor, an absorption tower, a bag-type dust remover and a pneumatic distribution device, wherein the flue reactor is horizontally arranged, a humidifying spray gun is arranged at the downstream of an inlet flue of the flue reactor, a fluidization air distribution plate is arranged at the bottom of the flue reactor and is connected with a fan through a fluidization air pipe, and the vertical cross section of the flue reactor is narrow at the bottom and wide at the top; the absorption tower is of a vertical structure, a spoiler is arranged in the absorption tower, and an inlet at the lower end of the absorption tower is connected with an outlet of the flue reactor; the bag-type dust collector is positioned above the flue reactor, an inlet of the bag-type dust collector is connected with an outlet at the top of the absorption tower, and an ash hopper at the bottom of the bag-type dust collector is communicated with a plurality of parts at the top of the flue reactor through a pneumatic distribution device.
Description
Technical Field
The invention relates to the technical field of semi-dry flue gas desulfurization, in particular to a semi-dry desulfurization system with a flue reactor and a method thereof.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, in the middleIn the field of dry flue gas desulfurization, a two-position integrated desulfurization and dust removal process of a Circulating Fluidized Bed (CFB) absorption tower and a bag-type dust remover is mature and has wide application. This kind of technology is mainly accomplished desulfurization reaction by circulating fluidized bed absorption tower, accomplishes the collection of reaction particulate matter by the sack cleaner, and the absorption tower is sent back again to the reaction particulate matter that will collect by circulation chute again, realizes the circulation reaction, promptly:
in the above material circulation flow, the role of the long-distance circulation chute is very critical, which easily causes the following problems: (1) The circulating ash must be conveyed to an inlet flue at the bottom area of the absorption tower again from the tail part of the bag-type dust collector, so that the material conveying distance is long, therefore, the integral desulfurization device must adopt an overhead type to ensure the inclination required by long-distance material conveying, and as a result, the device must be arranged in an overhead manner, and a supporting steel frame is huge; and because the circulation chute exposes among the external air environment, inevitably produce system's hourglass wind and material heat dissipation, make circulation ash material take place the cooling and condense, and then make the circulation chute take place serious jam problem, cause production to be forced to be interrupted. (2) The circulating ash material is placed in the external environment between the bag-type dust collector and the absorption tower in the long-distance external conveying process, cannot be kept in contact with the flue gas, cannot maintain the self temperature and cannot participate in the desulfurization reaction; (3) The desulfurization reaction only occurs in the stage that the flue gas flows through the absorption tower, and the reaction time is relatively short; (4) Because the humidifying water spray is arranged at the bottom of the absorption tower, the inside of the absorption tower must be made into a smooth wall surface to prevent slag adhering and adhesion of the inner wall of the absorption tower caused by the humidifying water spray, and therefore, a turbulent flow device and other strengthening reaction devices cannot be arranged inside the absorption tower.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a semi-dry desulfurization system with a flue reactor and a method thereof.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a semidry desulfurization system with a flue reactor, which comprises the flue reactor, an absorption tower, a bag-type dust remover and a pneumatic distribution device, wherein,
the flue reactor is horizontally arranged, a humidifying spray gun is arranged at the downstream of an inlet flue of the flue reactor, a fluidization air distribution plate is arranged at the bottom of the flue reactor and is connected with a fan through a fluidization air pipe, and the vertical cross section of the flue reactor is narrow at the bottom and wide at the top;
the absorption tower is of a vertical structure, a spoiler is arranged in the absorption tower, and an inlet at the lower end of the absorption tower is connected with an outlet of the flue reactor;
the bag-type dust collector is positioned above the flue reactor, an inlet of the bag-type dust collector is connected with an outlet at the top of the absorption tower, and an ash hopper at the bottom of the bag-type dust collector is communicated with a plurality of parts at the top of the flue reactor through a pneumatic distribution device.
In a second aspect, the invention provides a semidry desulfurization method with a flue reactor, which comprises the following steps:
the flue gas to be treated enters a flue reactor from an inlet flue, water is sprayed on the flue gas to humidify the flue gas, a desulfurizing agent and circulating fly ash are supplemented into the flue gas, and fluidized air is introduced to the bottom of the flue reactor to perform fluidized desulfurization on the flue gas;
the flue gas after fluidized desulfurization enters an absorption tower from the bottom, and a reaction interface is continuously updated under the collision of circulating ash and a desulfurizing agent with a spoiler for secondary desulfurization;
and the flue gas after secondary desulfurization is discharged after dedusting, part of the collected solid ash is discharged outside, and part of the collected solid ash is circulated to the flue reactor to participate in desulfurization reaction.
The beneficial effects achieved by one or more of the embodiments of the invention described above are as follows:
1) The first-step desulfurization reaction is realized in the flue reactor, and the flue gas humidification, the fresh desulfurizer and the circulating ash are mixed with the original flue gas in the flue reactor, so that the flue reactor becomes a reaction device which is more important than an absorption tower;
2) A long-distance circulating chute is eliminated, and circulating ash materials directly enter a flue reactor from top to bottom instead, so that the problems of flue gas air leakage and material cooling blockage in the prior art are thoroughly solved, the operation process of circulating ash is simplified, and the operation reliability is improved; in addition, because a long-distance circulating chute is omitted, the overall height of the semi-dry desulfurization device can be greatly reduced, the manufacturing cost of the device can be greatly reduced, and two purposes can be achieved;
3) Because the humidifying spray gun is moved to the flue reactor, the downstream absorption tower becomes a pure dry state, and the aeipathia in the semi-dry desulfurization industry of tower wall hanging is eliminated; meanwhile, on the basis, the cross-distributed spoilers can be safely arranged in the absorption tower, so that the reaction effect is further improved, and the utilization rate of the desulfurizer is improved;
in conclusion, compared with the existing Circulating Fluidized Bed (CFB) semi-dry desulfurization device, the whole device and the system are greatly simplified, but the performance is optimized in many aspects.
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 diagram of a semi-dry desulfurization system with a flue reactor according to one or more embodiments of the present invention;
FIG. 2 is a schematic cross-sectional view of a flue reactor according to one or more embodiments of the present disclosure;
FIG. 3 is a schematic cross-sectional view of a square absorber tower with a spoiler in accordance with one or more embodiments of the invention.
Wherein, 1-inlet flue; 2-flue reactor; 3-rising bent pipe; 4-inspection manhole; 5-an absorption tower; 6-a spoiler; 7-descending elbow pipe; 8-bag dust collector; 9-outlet flue; 10-ash bucket; 11-a first discharging device; 12-a first air distribution device; 13-a fresh desulfurizer adding device; 14-a second blanking device; 15-a second pneumatic distribution device; 16-ash discharge pipe; 17-humidifying water pipes; 18-a humidifying spray gun; 19-a fan; 20-pneumatic conveying main pipe; 21-fluidization air distribution plate; 22-a first fluidizing air duct; 23-second fluidizing air duct.
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 invention provides a semidry desulfurization system with a flue reactor, which comprises the flue reactor, an absorption tower, a bag-type dust remover and a pneumatic distribution device, wherein,
the flue reactor is horizontally arranged, a humidifying spray gun is arranged at the downstream of an inlet flue of the flue reactor, a fluidization air distribution plate is arranged at the bottom of the flue reactor and is connected with a fan through a fluidization air pipe, and the vertical cross section of the flue reactor is narrow at the bottom and wide at the top;
the absorption tower is of a vertical structure, a spoiler is arranged in the absorption tower, and an inlet at the lower end of the absorption tower is connected with an outlet of the flue reactor;
the bag-type dust collector is positioned above the flue reactor, an inlet of the bag-type dust collector is connected with an outlet at the top of the absorption tower, and an ash hopper at the bottom of the bag-type dust collector is communicated with a plurality of parts at the top of the flue reactor through a pneumatic distribution device.
The semi-dry desulfurization system with the flue reactor is integrally composed of three core devices, namely the flue reactor, an absorption tower and a bag-type dust collector. In the production process, firstly, a horizontally arranged flue reactor directly receives a desulfurizing agent and circulating ash from an ash hopper at the bottom of a desulfurizing agent powder bin and a bag-type dust collector, and carries out first-step desulfurization reaction with inlet flue gas, and then the flue gas carries reaction products and unreacted raw materials to continuously enter a vertically arranged absorption tower for carrying out desulfurization reaction again, so that the long-distance circulating chute can be realized. Therefore, the problem of blockage caused by the original long-distance circulating chute can be eliminated, the effective reaction time can be prolonged, meanwhile, the spoiler can be arranged in the pure dry type absorption tower to strengthen the desulfurization reaction, and the utilization rate of the desulfurizer is improved.
The vertical cross section of the flue reactor is narrow at the bottom and wide at the top, when the fluidized air is conveyed to the fluidized air distribution plate, the air speed at the bottom of the flue reactor is maximum, so that the deposition of fresh desulfurizer and circulating ash can be effectively prevented, the fresh desulfurizer and the circulating ash are always in a suspension state, the full mixing with flue gas is convenient to realize, and the desulfurization efficiency is effectively improved.
The flue reactor is horizontally arranged; is arranged at a low position; the arrangement position is coordinated with the outlets at the bottom of the fresh desulfurizer bin and the ash hopper of the bag-type dust collector to form a straight shape, so that the fresh desulfurizer and the circulating ash above the straight shape can be conveniently received.
The bottom ash hopper is communicated with a plurality of parts at the top of the flue reactor through the pneumatic distribution device, so that the recycled circulating ash can be conveniently and uniformly conveyed into the flue reactor, and the improvement on the mixing uniformity of the circulating ash and the flue gas is facilitated.
The spoiler is arranged in the absorption tower, so that collision and turnover movement of the flue gas and the circulating ash are realized, new reaction interfaces are continuously exposed out of ash particles, the utilization rate of the ash is improved, the calcium-sulfur consumption ratio is reduced, the desulfurization reaction is finally completed, and the process target is realized.
Along the flowing direction of the flue gas, the original flue gas sequentially passes through the flue reactor, the absorption tower and the bag-type dust remover and is discharged outside. Among them, the flue reactor is the most important core reaction device, and the absorption tower becomes an auxiliary secondary reaction device which further enhances the reaction property.
The outlets at the bottom of the fresh desulfurizer bin and the ash hopper of the bag-type dust collector adopt a pneumatic conveying mode and a multipoint distribution mode, so that the fresh desulfurizer and the circulating ash can quickly enter the flue reactor and can be quickly dispersed in the flue gas.
The fluidizing air distributing plate at the bottom of the flue reactor is made of high-permeability and high-wear-resistance organic synthetic materials.
In some embodiments, the flue reactor has a vertical cross-section with a funnel-shaped lower portion and a square upper portion.
The cross section area of the bottom of the flue reactor is the smallest and the flow velocity of the fluidized air is the largest due to the arrangement mode of the conical hopper shape below the reactor, so that the deposition of the fresh desulfurizer and the circulating ash is effectively prevented; the square upper part is convenient for providing a larger mixing reaction space and is beneficial to flue gas desulfurization. The inlet flue is square so as to be conveniently connected with the flue reactor.
And the flue reactor is used for receiving the original flue gas, the fresh desulfurizer and the circulating ash and generating physical mixing and primary desulfurization absorption reaction inside the flue reactor.
In some embodiments, the pneumatic distribution device comprises a fluidization cavity and a plurality of conveying pipelines, and the fluidization cavity is connected with each position of the flue reactor through the conveying pipelines. Used for uniformly conveying the circulating ash into the flue reactor.
In particular, the shape of the fluidization cavity may be spherical, square, diamond or other irregular shapes, and is preferably spherical in order to facilitate fluidization of the circulating ash.
Preferably, the fluidization cavity is connected with an ash discharge pipeline.
In some embodiments, the device further comprises a feeding device of fresh desulfurizer, which is positioned between the bag-type dust remover and the humidifying spray gun.
The humidifying spray gun is arranged at the upstream position, the pneumatic conveying inlet of the fresh desulfurizer is arranged at the middle position, and the pneumatic conveying inlet of the circulating ash is arranged at the downstream position. Firstly, atomized water is sprayed into the flue gas to fully humidify the flue gas and regulate the temperature of the flue gas.
Preferably, the inner wall of the flue reactor is made of wear-resistant and corrosion-resistant materials, and the thickness of the inner wall is 8-20m.
Preferably, the number of humidifying lances is from 1 to 20, more preferably from 2 to 10, still more preferably from 3 to 7.
Specifically, the number of the humidifying spray guns is the same as that of the bottom conical hoppers of the flue reactor, and the bottom conical hoppers correspond to one another, and are conical hoppers formed by conical structures. The humidifying spray gun is made of corrosion-resistant alloy steel.
In some embodiments, the fluidization fan is a centrifugal or roots fan. And the fluidization fan is used for providing fluidization air for the pneumatic distribution device and the fluidization air distribution plate.
The humidifying spray gun adopts process water with better water quality.
Preferably, the outlet of the fluidization fan is provided with a heater, and the heater is a steam heater or an electric heater. The device is used for improving the temperature of the fluidized air and preventing the fluidized air from condensation in winter to cause hardening and blockage.
In some embodiments, the spoilers are staggered in the height direction of the absorption tower, each spoiler being arranged horizontally.
Preferably, the cross section of the absorption tower is square, and the cross section of the spoiler is rectangular.
Further preferably, the ratio of the area of the spoiler to the cross-sectional area of the absorption tower is 1:4-10.
Preferably, the thickness of the flow disturbing plate is 8-30mm, preferably 8-20mm, and more preferably 8-15mm.
The spoiler is made of an anticorrosive wear-resistant material.
In a second aspect, the invention provides a semidry desulfurization method with a flue reactor, which comprises the following steps:
the flue gas to be treated enters a flue reactor from an inlet flue, water is sprayed on the flue gas to humidify the flue gas, a desulfurizing agent and circulating fly ash are supplemented into the flue gas, and fluidized air is introduced to the bottom of the flue reactor to perform fluidized desulfurization on the flue gas;
the flue gas after fluidized desulfurization enters an absorption tower from the bottom, and a reaction interface is continuously updated under the collision of circulating ash and a desulfurizing agent with a spoiler, so that secondary desulfurization is carried out;
and (3) discharging the flue gas subjected to secondary desulfurization after dedusting, discharging part of the collected solid ash, and circulating part of the collected solid ash to the flue reactor to participate in desulfurization reaction.
In some embodiments, the residence time of the flue gas in the flue reactor is between 2 and 3s.
The flow velocity of the flue gas in the flue reactor is 10 to 15m/s, preferably 6 to 10m/s.
In some embodiments, the sprayed mist has a particle size of 10 to 50 μm.
The humidifying spray gun adopts a regulating valve to control the process water flow, and realizes the linear regulating level between 0 and 75 percent.
In some embodiments, the flue reactor outlet flue gas temperature is between 80 and 100 ℃.
In some embodiments, the flue gas flow rate in the absorber is between 5 and 6m/s.
The invention is further illustrated by the following figures and examples.
Examples
As shown in fig. 1, a semidry desulfurization system with a flue reactor comprises a flue reactor 2, an absorption tower 5, a bag-type dust collector 8 and a pneumatic distribution device, wherein the flue reactor 2 is horizontally arranged, a humidifying spray gun 18 is arranged at the downstream of an inlet flue 1 of the flue reactor, a fluidizing air distribution plate 21 is arranged at the bottom of the flue reactor 2, the fluidizing air distribution plate 21 is connected with a fan 19 through a fluidizing air pipe, and the vertical cross section of the flue reactor 2 is narrow at the bottom and wide at the top; the lower part of the vertical cross section of the flue reactor 2 is in a cone hopper shape, and the upper part is in a square shape; the inner wall of the inner wall is made of wear-resistant and corrosion-resistant materials, and the thickness of the inner wall is 8-20m;
the absorption tower 5 is of a vertical structure, a spoiler 6 is arranged in the absorption tower, an inlet at the lower end of the absorption tower is connected with an outlet of the flue reactor 2 through an ascending elbow 3, and the ascending elbow 3 is made of an anticorrosive wear-resistant material.
The spoilers 6 are arranged in a staggered manner along the height direction of the absorption tower 5, each spoiler is arranged horizontally, the ratio of the area of the spoilers 6 to the cross-sectional area of the absorption tower 5 is 1:4-10, and the thickness of the spoilers 6 is greater than 8mm, as shown in fig. 3.
The bag-type dust collector 8 is positioned above the flue reactor 2, an inlet of the bag-type dust collector is connected with an outlet at the top of the absorption tower 5 through a descending elbow 7, and a bottom ash hopper 10 of the bag-type dust collector is communicated with a plurality of positions at the top of the flue reactor 2 through a pneumatic distribution device. The descending elbow 7 is used for guiding the clean flue gas at the outlet of the absorption tower 5 downwards to the inlet of the bag-type dust collector 8, and the descending elbow 7 is made of an anti-corrosion wear-resistant material.
The ash bucket 10 is arranged at the bottom of the bag-type dust collector 8 and above the flue reactor 2 and used for storing circulating ash, the total volume of the ash bucket 10 at the bottom is required to meet a certain requirement of circulating operation time, and the total volume is controlled within the dosage range of 2-4 h; an air fluidizing device is arranged in the bottom ash hopper 10 to prevent the compaction and hardening of the circulating ash, and the inclination of the outer wall of the bottom ash hopper 10 is controlled within the range of 60-75 degrees to keep the smoothness of the blanking.
The blanking device is arranged at the bin of the feeding device of the fresh desulfurizer and the outlet of an ash bucket at the bottom of the bag-type dust collector, is used for providing circulating materials to the lower flue reactor, adopts variable frequency control and is provided with a compressed air sealing system.
The pneumatic distribution device comprises a fluidization cavity and a plurality of conveying pipelines, and the fluidization cavity is connected with each position of the flue reactor through the conveying pipelines. The device is arranged below the blanking device and used for providing fluidizing air and uniformly feeding circulating ash in a fluidized state into the flue reactor through a plurality of conveying pipelines.
The pneumatic distributor is spherical and has one fluidizing air inlet, several circulating ash outlets and one outer ash discharging port, and its volume is controlled in 0.2-0.5 m 3 In the presence of a surfactant. It is made of wear-resistant steel, and the wall thickness is not less than 8mm.
The feeding device 13 of the fresh desulfurizer is positioned between the bag-type dust collector 8 and the humidifying spray gun 18, is arranged above the flue reactor 2 and is used for storing the fresh desulfurizer, the total volume of the feeding device meets the requirement of operation time, and the total volume is controlled within the dosage range of 2-5 days.
The number of the humidifying spray guns 18 is the same as that of the bottom cone hoppers of the flue reactor 2, and the bottom cone hoppers are in one-to-one correspondence, and are cone hoppers formed by a cone structure. The humidifying lance 18 is made of corrosion resistant alloy steel. The fluidizing fan 19 is a centrifugal fan or a roots fan. And the fluidization fan is used for providing fluidization air for the pneumatic distribution device and the fluidization air distribution plate. The outlet of the fluidization fan is provided with a heater which is a steam heater or an electric heater. The device is used for improving the temperature of the fluidized air and preventing the fluidized air from condensation in winter to cause hardening and blockage.
Flue gas desulfurization process: the original flue gas enters a flue reactor 2 from a system inlet flue 1, is fully mixed with water sprayed by a humidifying spray gun 18, the blanking of a fresh desulfurizer powder bin 13 and the blanking of an ash bucket 10 at the bottom of a bag-type dust collector, passes through an ascending elbow 3, enters an absorption tower 5, the flow velocity of the ascending elbow is controlled within the range of 10-15 m/s, the flow velocity of the flue gas in the absorption tower is controlled within the range of 5-6 m/s, is then guided into a bag-type dust collector 8 through a descending elbow 7, and is finally discharged through a system outlet flue 9.
Circulating ash material flow: fresh desulfurizer conveyed by a second blanking device 14 at the bottom of a reactant bin 13 and a second pneumatic distribution device 15 and circulating ash conveyed by a first blanking device 11 at the bottom of an ash hopper 10 and a first pneumatic distribution device 12 enter a flue reactor 2, are mixed with flue gas to perform a first desulfurization reaction, enter an absorption tower 5 through an ascending elbow pipe 3 to perform a further reaction, and are brought into a bag-type dust collector 8 through flue gas through a descending elbow pipe 7, wherein the flow rate of the descending elbow pipe is controlled within the range of 10-15 m/s. After collecting the circulating ash in the flue gas, the bag-type dust collector 8 discharges the circulating ash into a bottom ash hopper 10 for storage; then the stored circulating ash material passes through a first feeding device 11 and a first pneumatic distribution device 12 of a bottom ash hopper 10, returns to the horizontally arranged flue reactor 2 again in a pneumatic conveying mode and a multipoint feeding mode, and is supported by a pneumatic air distribution plate 21 arranged at the bottom of the flue reactor to perform new reaction circulation.
And (3) ash discharging flow: in the first pneumatic distribution device 12 for circulating ash, an outer ash discharge interface is arranged and connected with an outer ash discharge pipe 16; the amount of the discharged ash can be controlled according to the production condition.
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 (10)
1. The utility model provides a semidry desulfurization system with flue reactor which characterized in that: comprises a flue reactor, an absorption tower, a bag-type dust remover and a pneumatic distribution device, wherein,
the flue reactor is horizontally arranged, a humidifying spray gun is arranged at the downstream of an inlet flue of the flue reactor, a fluidization air distribution plate is arranged at the bottom of the flue reactor and is connected with a fan through a fluidization air pipe, and the vertical cross section of the flue reactor is narrow at the bottom and wide at the top;
the absorption tower is of a vertical structure, a spoiler is arranged in the absorption tower, and an inlet at the lower end of the absorption tower is connected with an outlet of the flue reactor;
the bag-type dust collector is positioned above the flue reactor, an inlet of the bag-type dust collector is connected with an outlet at the top of the absorption tower, and an ash hopper at the bottom of the bag-type dust collector is communicated with a plurality of parts at the top of the flue reactor through a pneumatic distribution device.
2. The semi-dry desulfurization system with a flue reactor according to claim 1, characterized in that: the lower part of the vertical cross section of the flue reactor is in a cone bucket shape, and the upper part is in a square shape.
3. The semi-dry desulfurization system with a flue reactor as set forth in claim 1, wherein: the pneumatic distribution device comprises a fluidization cavity and a plurality of conveying pipelines, and the fluidization cavity is connected with each position of the flue reactor through the conveying pipelines;
preferably, the fluidization cavity is connected with an ash discharge pipeline.
4. The semi-dry desulfurization system with a flue reactor according to claim 1, characterized in that: the device also comprises a feeding device of a fresh desulfurizer, which is positioned between the bag-type dust remover and the humidifying spray gun;
preferably, the inner wall of the flue reactor is made of wear-resistant and corrosion-resistant materials, and the thickness of the inner wall is 8-20m;
preferably, the number of humidifying lances is from 1 to 20, more preferably from 2 to 10, still more preferably from 3 to 7.
5. The semi-dry desulfurization system with a flue reactor according to claim 1, characterized in that: the fluidization fan is a centrifugal fan or a Roots fan;
preferably, the outlet of the fluidization fan is provided with a heater, and the heater is a steam heater or an electric heater.
6. The semi-dry desulfurization system with a flue reactor according to claim 1, characterized in that: the spoilers are arranged in a staggered manner along the height direction of the absorption tower, and each spoiler is horizontally arranged;
preferably, the cross section of the absorption tower is square, and the cross section of the spoiler is rectangular;
further preferably, the ratio of the area of the spoiler to the cross-sectional area of the absorption tower is 1:4-10;
preferably, the thickness of the flow disturbing plate is 8-30mm, preferably 8-20mm, and more preferably 8-15mm.
7. A semi-dry desulfurization method with a flue reactor is characterized in that: the method comprises the following steps:
the flue gas to be treated enters a flue reactor from an inlet flue, water is sprayed on the flue gas to humidify the flue gas, a desulfurizing agent and circulating fly ash are supplemented into the flue gas, and fluidized air is introduced to the bottom of the flue reactor to perform fluidized desulfurization on the flue gas;
the flue gas after fluidized desulfurization enters an absorption tower from the bottom, and a reaction interface is continuously updated under the collision of circulating ash and a desulfurizing agent with a spoiler for secondary desulfurization;
and the flue gas after secondary desulfurization is discharged after dedusting, part of the collected solid ash is discharged outside, and part of the collected solid ash is circulated to the flue reactor to participate in desulfurization reaction.
8. The semi-dry desulfurization method with a flue reactor according to claim 7, characterized in that: the residence time of the flue gas in the flue reactor is 2-3s;
preferably, the particle size of the sprayed mist is 10 to 50 μm.
9. The semi-dry desulfurization method with a flue reactor according to claim 7, characterized in that: the temperature of flue gas at the outlet of the flue reactor is 80-100 ℃.
10. The semi-dry desulfurization method with a flue reactor according to claim 7, characterized in that: the flow velocity of the flue gas in the absorption tower is 5-6 m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210814465.5A CN115212714B (en) | 2022-07-12 | 2022-07-12 | Semi-dry desulfurization system and method with flue reactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102302897A (en) * | 2011-07-30 | 2012-01-04 | 华电电力科学研究院 | Device and method for desulfurization and dust removal by spraying quick lime powder with supersaturation water |
| CN208193917U (en) * | 2018-09-11 | 2018-12-07 | 浙江西子联合工程有限公司 | A kind of desulphurization system for phosphorous chemical industry exhaust waste heat generation flue gas |
| CN109331649A (en) * | 2018-11-22 | 2019-02-15 | 青岛天正洁能环保科技有限公司 | Coke oven flue gas semi-dry desulphurization, dedusting and low-temperature denitration device and its process |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102302897A (en) * | 2011-07-30 | 2012-01-04 | 华电电力科学研究院 | Device and method for desulfurization and dust removal by spraying quick lime powder with supersaturation water |
| CN208193917U (en) * | 2018-09-11 | 2018-12-07 | 浙江西子联合工程有限公司 | A kind of desulphurization system for phosphorous chemical industry exhaust waste heat generation flue gas |
| CN109331649A (en) * | 2018-11-22 | 2019-02-15 | 青岛天正洁能环保科技有限公司 | Coke oven flue gas semi-dry desulphurization, dedusting and low-temperature denitration device and its process |
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