CN215311427U - Circulating fluidized bed semi-dry desulfurization device - Google Patents
Circulating fluidized bed semi-dry desulfurization device Download PDFInfo
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- CN215311427U CN215311427U CN202120805483.8U CN202120805483U CN215311427U CN 215311427 U CN215311427 U CN 215311427U CN 202120805483 U CN202120805483 U CN 202120805483U CN 215311427 U CN215311427 U CN 215311427U
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Abstract
The utility model belongs to the technical field of flue gas desulfurization, and particularly relates to a circulating fluidized bed semi-dry desulfurization device, which comprises a desulfurization tower and a dust remover, and also comprises: returning the circulating ash to the storage bin; the desulfurizing tower includes: the device comprises a desulfurizing tower inlet section, a desulfurizing tower Venturi tube, a desulfurizing tower diffusion section, a desulfurizing tower main body reaction section and a desulfurizing tower outlet section; the flue gas to be desulfurized enters the desulfurizing tower through the inlet section of the desulfurizing tower; the outlet section of the desulfurizing tower is connected with the inlet of a dust remover, and the outlet of the dust remover is connected with a circulating ash returning bin; the circulating ash return bin is a space formed by the cavity coated on the outer side of the Venturi tube of the desulfurizing tower and the outer sides of the Venturi tube and the diffusion section of the desulfurizing tower and is used for returning circulating ash to the desulfurizing tower. The device can feed the circulating desulfurization ash along the circumference of the bottom of the Venturi tube of the desulfurization tower, the feeding is uniform on the whole radial section, the uniform mixing of the desulfurization ash and the flue gas is fully ensured, and the local non-uniformity of gas-solid two-phase flow is avoided.
Description
Technical Field
The utility model belongs to the technical field of flue gas desulfurization, and particularly relates to a circulating fluidized bed semi-dry desulfurization device.
Background
The semidry desulfurization process of the circulating fluidized bed is one of the main flue gas desulfurization and dust removal processes at present, and is a main way for realizing ultralow emission of flue gas. The main equipment used in said process is circulating fluidized bed desulfurizing tower and dust remover, and its working principle is that the flue gas is passed through inlet section of circulating fluidized bed desulfurizing tower and fed into Venturi tube, at the same time the desulfurizing agent and external circulating desulfurization ash are fluidized and fed into Venturi tube in the desulfurizing tower, the flue gas and desulfurizing agent are fully mixed, and then the flue gas and desulfurizing agent are undergone the process of desulfurization semi-dry type washing reaction in the reaction section of desulfurizing tower. The desulfurized fly ash separated from the flue gas by the dust remover after being treated by the desulfurizing tower is returned to the venturi tube in the desulfurizing tower by the conveying device of the fly ash circulating system to form the circulation of the desulfurized fly ash, namely the circulated desulfurized fly ash.
Nowadays, the circulating fluidized bed desulfurizing tower is mostly in an ascending empty tower structure, namely, the lower part of the tower is a flue gas inlet, and the upper part of the tower is a flue gas outlet. According to the flue gas flow, the desulfurizing tower comprises an inlet section, a Venturi tube, a diffusion section, a main body reaction section and an outlet. In the existing circulating fluidized bed desulfurization process, the desulfurizing agent and the tower-entering part of the external circulating desulfurization ash are generally arranged on the section of a Venturi tube, the sectional area of the Venturi tube is small, the flow rate of flue gas is high, and the desulfurization ash is scattered by the high flow rate and is fully mixed with the flue gas for desulfurization.
The desulfurization ash of the external circulation return tower is arranged in a venturi tube at the tower entering part, return equipment usually adopts an air chute or mechanical conveying equipment, and the number of the return equipment is usually one or two, so that one or two return ports are generally arranged in the venturi tube.
However, the existing circulating fluidized bed desulfurization system has the problems that the coverage area of the material returning port is too small relative to the section of the venturi tube and is concentrated on the half side of the tube, which causes that after desulfurization ash enters the tower, the gas-solid two-phase flow is not uniform, the flue gas is difficult to be uniformly mixed with the desulfurization ash, the requirement on a flow field is too high, and the desulfurization efficiency is affected or the calcium-sulfur ratio is increased. Sometimes, the amount of the returned materials is too large in the moment, so that the circulating desulfurization ash falls into the inlet section of the desulfurization tower, and the safe operation of a desulfurization system is influenced.
Disclosure of Invention
The utility model aims to provide a circulating fluidized bed semidry method desulfurization device aiming at the problems of desulfurization ash external circulation returning tower in the prior art, which can flexibly and effectively control the feeding of desulfurization ash in the external circulation process, thereby controlling the return quantity of the desulfurization ash and ensuring that the uniformity of two-phase flow of airflow in the tower is not influenced by the change of the return quantity.
In order to achieve the above purpose, the utility model provides the following technical scheme:
the utility model provides a circulating fluidized bed semidry process desulphurization unit, includes desulfurizing tower and dust remover, still includes: returning the circulating ash to the storage bin;
the desulfurizing tower includes: the device comprises a desulfurizing tower inlet section, a desulfurizing tower Venturi tube, a desulfurizing tower diffusion section, a desulfurizing tower main body reaction section and a desulfurizing tower outlet section;
the flue gas to be desulfurized enters the desulfurizing tower through the inlet section of the desulfurizing tower and is discharged from the outlet section of the desulfurizing tower after being desulfurized;
the outlet section of the desulfurizing tower is connected with the inlet of a dust remover, and the outlet of the dust remover is connected with a circulating ash returning bin;
the circulating ash return bin is a space formed by the cavity coated on the outer side of the Venturi tube of the desulfurizing tower and the outer sides of the Venturi tube and the diffusion section of the desulfurizing tower and is used for returning circulating ash to the desulfurizing tower.
In one embodiment, the upper part of the cavity covering the outer side of the venturi tube of the desulfurization tower is provided with an inverted-trumpet-shaped opening.
In one embodiment, the middle of the cavity covering the outer side of the venturi tube of the desulfurization tower is in a hollow cylinder structure.
In one embodiment, the lower part of the cavity covering the outer side of the Venturi tube of the desulfurizing tower is of a conical structure, and the inclination of the conical surface is not lower than 60 degrees; and the lower part of the cavity is hermetically connected with the outer side of the top of the inlet section of the desulfurizing tower.
In one embodiment, the cross section of the circulating ash return bin is annular, and the space formed by the venturi tube of the desulfurization tower or the diffusion section of the desulfurization tower is an inner ring.
In one embodiment, a feeding gap is formed between the inner side of the lower part of the cavity coated on the outer side of the Venturi tube of the desulfurizing tower and the bottom of the Venturi tube of the desulfurizing tower; and the venturi tube of the desulfurizing tower is a component capable of moving up and down (for example, moving up and down by means of a mechanical device) and is used for adjusting the size of the feeding gap formed between the bottom of the venturi tube of the desulfurizing tower and the inner side of the lower part of the cavity covering the outer side of the venturi tube of the desulfurizing tower.
In one embodiment, the feeding gap is measured by the direct distance h between the bottom of the venturi tube of the desulfurization tower and the lower part of the cavity covering the outer side of the venturi tube of the desulfurization tower, and is used for controlling the returning amount of the circulating ash returning to the desulfurization tower.
In one embodiment, the outlet of the dust separator is connected to the circulating ash return bin via an air chute or mechanical conveying device.
In a preferred embodiment, the mechanical transfer device is a pipeline.
In one embodiment, an ash flow valve is arranged on the mechanical conveying equipment and used for adjusting the amount of circulating ash entering the circulating ash returning bin.
In one embodiment, the duster is a bag duster.
According to the utility model, the circulating ash return bin is arranged at the venturi tube section of the circulating fluidized bed desulfurization tower, and the cavity of the return bin is coated on the outer side wall of the venturi tube of the desulfurization tower and can form a feeding space with the outer side wall of the venturi tube of the desulfurization tower; meanwhile, the lower periphery of the Venturi tube is used as an annular circulating ash return port in the feeding space, so that adverse effects on uniform feeding and solid-gas mixing caused by the limitation of the opening position or size of a conventional return port are avoided, and uniform feeding of the desulfurization ash along the circumference of the Venturi tube is realized; the feeding clearance of this annular material returning mouth is with the bottom of desulfurizing tower venturi and the footpath direct distance h meter of cladding between the cavity lower part in the desulfurizing tower venturi outside, and through adjusting venturi and realizing h's big or small control, the material level in the material returning storehouse and the returning charge volume that can adjust circulation ash.
Compared with the prior art, the technical scheme of the utility model has the beneficial effects that:
1) the circulating desulfurization ash is fed annularly along the lower part of a Venturi tube of the desulfurization tower in a circle, and is uniformly fed on the whole radial section, so that the uniform mixing of the desulfurization ash and the flue gas is fully ensured, and the local non-uniformity of gas-solid two-phase flow is avoided, and the low desulfurization efficiency caused by the over-small local concentration is avoided; meanwhile, the phenomenon that the desulfurization ash falls into the inlet section of the desulfurization tower due to excessive single-point or multi-point return material amount can be avoided;
2) by arranging the circulating ash material reflecting bin, the circulating desulfurization ash and the flue gas can be fully mixed and contacted, the desulfurization efficiency is improved, and the consumption of a desulfurizing agent can be reduced under the same working condition, namely the calcium-sulfur ratio is reduced;
3) by arranging the circulating ash anti-material bin, circulating desulfurization ash and flue gas can be fully mixed and contacted, and can be more uniformly and rapidly combined with the desulfurization ash after humidification and reaction water of a diffusion section of the desulfurization tower enters the tower, so that the desulfurization ash is prevented from being adhered to the inner wall of the tower due to local over-wetting;
4) by arranging the circulating ash anti-material bin, the circulating desulfurization ash and the flue gas can be fully mixed and contacted, the problem that the outlet section of the desulfurization tower cannot be completely evaporated to dryness due to local over-wetting of water in the tower is avoided, the desulfurization reaction time can be reduced due to the improvement of the desulfurization efficiency, and the overall height of the desulfurization tower can be reduced;
5) through adjusting the direct distance h between the annular material return opening on the venturi tube of the desulfurizing tower and the lower part of the cavity covering the outer side of the venturi tube of the desulfurizing tower, the control of the amount of the desulfurized ash entering the venturi tube is realized, the material return amount of the desulfurized ash returning to the desulfurizing tower is controlled, and the uniformity of the gas-solid two-phase flow in the tower is ensured not to be influenced by the change of the material return amount.
Drawings
FIG. 1 is a schematic view showing the structure of a conventional desulfurization apparatus and the circulation flow of desulfurized fly ash;
FIG. 2 is a schematic view of a venturi tube of the desulfurization device shown in FIG. 1 and a first material returning port formed thereon;
FIG. 3 is a schematic view of a venturi tube of the desulfurization device shown in FIG. 1 and a second material returning port formed thereon;
FIG. 4 is a schematic view showing the structure and flow of the circulating fluidized bed semi-dry desulfurization apparatus of the present invention.
Fig. 5 is a schematic structural view of a desulfurized ash return bin of the desulfurization unit of fig. 4.
In the above figures, the reference numerals are explained as follows:
1-a desulfurizing tower, 2-a dust remover, 3-a desulfurized fly ash returning bin, 4-an ash flow valve, 5-a pipeline and 6-a returning port;
11-an inlet section of a desulfurizing tower, 12-a Venturi tube of the desulfurizing tower, 13-a diffusing section of the desulfurizing tower, 14-a main body reaction section of the desulfurizing tower and 15-an outlet section of the desulfurizing tower.
Detailed Description
In order that the technical features and contents of the present invention can be understood in detail, preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention have been described in the examples, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein.
The semidry desulfurization process of the circulating fluidized bed is one of the main flue gas desulfurization and dust removal processes at present, and the existing traditional flue gas desulfurization and desulfurization ash circulating device is shown in figure 1 and comprises a desulfurization tower 1, a dust remover 2 and an ash flow valve 4; the flue gas to be treated enters from the inlet section 11 of the desulfurizing tower and flows upwards, passes through a Venturi tube 12 of the desulfurizing tower, a diffusing section 13 of the desulfurizing tower and a main body reaction section 14 of the desulfurizing tower in sequence, is subjected to a desulfurizing treatment process, is discharged from the outlet section 15 of the desulfurizing tower, enters the inlet of the dust remover 2, and is discharged after dust removal treatment.
The desulfurized ash carried with the flue gas is brought into the dust remover 2 by the flue gas, and is separated from the flue gas in the dust remover and then returns to the desulfurizing tower 1 for recycling through an air chute or mechanical conveying equipment through a desulfurizing tower Venturi tube 12. The externally circulated desulfurized fly ash is introduced into the desulfurization tower 1 through the venturi 12 of the desulfurization tower, typically through one or two return ports 6 (the structure of which is schematically shown in fig. 2 and 3) provided in the venturi. The circulating amount of desulfurized fly ash is regulated by the ash flow valve 4.
In the devices shown in fig. 1-3, since the coverage area of the material return opening 6 is too small relative to the cross section of the venturi tube and is concentrated on the half side of the venturi tube, the gas-solid two-phase flow is not uniform after the desulfurized ash enters the tower, the flue gas is difficult to be uniformly mixed with the desulfurized ash, the requirement on the flow field is too high, and the desulfurization efficiency is affected or the calcium-sulfur ratio is increased. In addition, in the operation process, if the instantaneous circulating ash returning amount is too large, the circulating desulfurization ash can fall into the inlet section 11 of the desulfurization tower, and the safe operation of the desulfurization system is further influenced.
In one embodiment, the semi-dry desulfurization device for the circulating fluidized bed, provided by the utility model, has a structure as shown in fig. 4, and comprises a desulfurization tower, a dust remover 2 and a circulating ash returning bin 3;
the desulfurizing tower includes: the device comprises a desulfurizing tower inlet section 11, a desulfurizing tower Venturi tube 12, a desulfurizing tower diffusion section 13, a desulfurizing tower main body reaction section 14 and a desulfurizing tower outlet section 15;
the flue gas to be desulfurized enters the desulfurizing tower through the inlet section 11 of the desulfurizing tower, and is discharged from the outlet section 15 of the desulfurizing tower after being desulfurized; generally speaking, the circulating fluidized bed desulfurizing tower is mostly in an ascending empty tower structure, namely, the lower part of the tower is a flue gas inlet, and the upper part of the tower is a flue gas outlet; according to the trend of the flue gas, the flue gas flows through an inlet section 11 of a desulfurizing tower and enters a Venturi tube 12 of the desulfurizing tower, meanwhile, a desulfurizing agent and externally circulated desulfurization ash are fluidized and sent to the Venturi tube 12 of the desulfurizing tower, the flue gas and the desulfurizing agent are fully mixed in a diffusion section 13 of the desulfurizing tower and are subjected to a desulfurization semi-dry type washing reaction in a main body reaction section 14 of the desulfurizing tower, and the flue gas is treated by the desulfurizing tower and then discharged through an outlet section 15 of the desulfurizing tower;
the outlet section 15 of the desulfurizing tower is connected with the inlet of the dust remover 2, and the flue gas discharged from the outlet section 15 of the desulfurizing tower enters the inlet of the dust remover 2 and is discharged after dust removal treatment; the outlet of the dust remover 2 is connected with the circulating ash return bin 3, and the desulfurized ash carried along with the flue gas is brought into the dust remover 2 by the flue gas and is separated from the flue gas in the dust remover; the desulfurized ash is separated by the dust remover 2 and enters the circulating ash returning bin 3 through an air chute or mechanical conveying equipment;
as shown in fig. 5, the circulating ash returning bin 3 is a space formed by a cavity coated on the outer side of the venturi tube 12 of the desulfurization tower, the venturi tube 12 of the desulfurization tower and the outer side of the diffuser section 13 of the desulfurization tower, and is used for returning the circulating ash to the desulfurization tower, and the circulating ash returning bin 3 can be used as an intermediate container for the circulating ash to enter the desulfurization tower;
the circulating ash returning bin 3 comprises the upper part, the middle part and the lower part of the cavity; the upper part of the cavity covering the outer side of the Venturi tube 12 of the desulfurizing tower is provided with an inverted trumpet-shaped opening; the middle part of the cavity which is coated on the outer side of the Venturi tube 12 of the desulfurizing tower is of a hollow cylinder structure; the lower part of the cavity covering the outer side of the venturi tube 12 of the desulfurization tower is of a conical structure, and the inclination of the conical surface is not lower than 60 degrees (for example, 65 degrees, 70 degrees and 80 degrees); the lower part of the cavity is hermetically connected with the outer side of the top of the inlet section 11 of the desulfurizing tower;
a feeding gap is formed between the inner side of the lower part of the cavity coated on the outer side of the Venturi tube 12 of the desulfurizing tower and the bottom of the Venturi tube 12 of the desulfurizing tower; the desulfurizing tower venturi tube 12 is a component capable of moving up and down (for example, moving up and down by means of a mechanical device) and is used for adjusting the size of the feeding gap formed between the bottom of the desulfurizing tower venturi tube 12 and the inner side of the lower part of the cavity covering the outer side of the desulfurizing tower venturi tube 12; the feeding clearance is measured by the bottom of the Venturi tube 12 of the desulfurizing tower and the diameter distance h between the lower parts of the cavities coated on the outer side of the Venturi tube 12 of the desulfurizing tower, and is used for adjusting the returning amount of the circulating ash returning to the desulfurizing tower.
In one embodiment, the cross section of the circulating ash returning bin 3 is annular, and the space formed by the venturi 12 of the desulfurization tower or the diffusion section 13 of the desulfurization tower is an inner ring.
In one embodiment, the outlet of the dust separator 2 is connected to the circulating ash return bin 3 via line 5.
In one embodiment, an ash flow valve 4 is provided on the mechanical conveying equipment for controlling the amount of circulating ash entering the circulating ash return bin 3 and controlling the material level in the return bin.
In one embodiment, the precipitator 2 is a bag precipitator.
In one embodiment of the present invention, the method for performing external circulation of desulfurized fly ash using the circulating fluidized bed semi-dry desulfurization apparatus shown in FIG. 4 comprises the steps of:
the flue gas to be treated flows upwards through the inlet section 11 of the desulfurizing tower, enters the Venturi tube 12 of the desulfurizing tower, simultaneously fluidizes a desulfurizing agent and externally circulated desulfurization ash and sends the fluidized flue gas and the externally circulated desulfurization ash into the Venturi tube of the desulfurizing tower, the flue gas and the desulfurizing agent are fully mixed in the diffusion section 13 of the desulfurizing tower and then enter the main body reaction section 14 of the desulfurizing tower for desulfurization semi-dry type washing reaction, and the flue gas treated by the desulfurizing tower is discharged through the outlet section 15 of the desulfurizing tower.
The flue gas discharged from the outlet section 15 of the desulfurizing tower enters the inlet of the dust remover 2, and is discharged after being dedusted by the dust remover.
The desulfurized ash which is discharged from the outlet section 15 of the desulfurizing tower and carried with the flue gas is brought into the dust remover 2 by the flue gas, is separated from the flue gas in the dust remover and then is returned into the desulfurized ash returning bin 3 through the pipeline 5; the amount of the circulating ash entering the circulating ash returning bin 3 is controlled by the ash flow valve 4, so that the circulating ash can keep a certain material level in the desulfurization ash returning bin 3.
As shown in fig. 5, in the desulfurized fly ash returning bin 3, there is a feeding gap between the lower inner side of the cavity covering the outer side of the desulfurizing tower venturi tube 12 and the bottom of the desulfurizing tower venturi tube 12, and the desulfurized fly ash which is held at a certain material level in the desulfurized fly ash returning bin 3 is returned to the desulfurizing tower through the feeding gap. The venturi tube 12 is a movable part (for example, movable up and down by means of a mechanical device), and the feeding gap is measured by the direct distance h between the bottom of the venturi tube 12 and the lower part of the cavity covering the outside of the venturi tube 12, and is used for controlling the amount of the returned circulating ash returned to the desulfurization tower. By effectively and flexibly controlling the return quantity of the desulfurized ash returned to the desulfurizing tower, the uniformity of the two-phase flow of the airflow in the tower is ensured not to be influenced by the change of the return quantity. In some examples, the value of h can be between 0-100 mm (e.g., 1mm, 10mm, 20mm, 50mm, 80mm, 90 mm).
The material level of the desulfurization ash in the desulfurization ash returning bin 3 can be monitored and adjusted through the ash flow valve 4 arranged on the pipeline 5, the material level of the desulfurization ash is not lower than the preset lowest material level (the lowest material level can be realized through the control of the ash flow valve 4) in the operation of the device, and the desulfurization ash is ensured to be filled in the lower part of the bin depending on the self flowability, namely, the lower part of the desulfurization ash bin 3 is always filled with materials; when the material level in the desulfurized fly ash return bin 3 reaches the preset highest material level (the highest material level can be realized by the control of the ash flow valve 4), the ash flow valve 4 is closed. Here, the "lowest material level" may refer to a material level height measured from the lowest end of the desulfurized fly ash returning bin 3 as a starting point, and the height is less than or equal to the total height of the desulfurized fly ash returning bin 3; in some examples, the "lowest level" is greater than or equal to 1200mm (e.g., 1500mm, 2000mm, 2500mm, 3000 mm). The maximum material level can refer to the distance between the material level and the topmost end of the desulfurized fly ash returning bin 3, and the distance is more than or equal to 0; in some examples, the "maximum level" is less than or equal to 1000mm (e.g., 800mm, 500mm, 300mm, 100mm, 50 mm).
In the method, as the circular desulfurization ash is fed annularly along the circumference of the bottom of the venturi tube 12 of the desulfurization tower in the formed feeding gap, the uniform feeding mode on the whole radial section fully ensures that the desulfurization ash and the flue gas are uniformly mixed, and the local non-uniformity of gas-solid two-phase flow is avoided, particularly the low desulfurization efficiency caused by the over-low local concentration; meanwhile, the phenomenon that the desulfurization ash falls into the inlet section 11 of the desulfurization tower due to overlarge single-point or multi-point return amount can be avoided. In addition, the amount of the desulfurized ash entering the Venturi tube is controlled by adjusting the radial distance h between the annular return port on the Venturi tube 12 of the desulfurizing tower and the lower part of the cavity coated on the outer side of the Venturi tube of the desulfurizing tower, so that the return amount of the desulfurized ash returning to the desulfurizing tower is controlled, and the uniformity of the gas-solid two-phase flow in the tower is ensured not to be influenced by the change of the return amount.
After the circulating desulfurization ash is fully mixed and contacted with the flue gas, the desulfurization efficiency is improved, and the using amount of a desulfurizing agent can be reduced under the same working condition, namely the calcium-sulfur ratio is reduced. In addition, after the circulating desulfurization ash is fully mixed and contacted with the flue gas, the desulfurization ash can be more uniformly and rapidly combined with the desulfurization ash by humidifying the diffusion section of the desulfurization tower and feeding reaction water into the tower, so that the desulfurization ash is prevented from being adhered to the inner wall of the tower due to local over-wetting; the problem that the outlet section of the desulfurizing tower cannot be completely evaporated to dryness due to the fact that water is locally over-wet in the tower can be avoided, the desulfurizing reaction time can be shortened due to the improvement of the desulfurizing efficiency, and the overall height of the desulfurizing tower can be reduced.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. The utility model provides a circulating fluidized bed semidry process desulphurization unit, includes desulfurizing tower and dust remover (2), its characterized in that still includes: a circulating ash returning bin (3);
the desulfurizing tower includes: the device comprises a desulfurizing tower inlet section (11), a desulfurizing tower Venturi tube (12), a desulfurizing tower diffusion section (13), a desulfurizing tower main body reaction section (14) and a desulfurizing tower outlet section (15);
the flue gas to be desulfurized enters the desulfurizing tower through the inlet section (11) of the desulfurizing tower and is discharged from the outlet section (15) of the desulfurizing tower after being desulfurized;
the outlet section (15) of the desulfurizing tower is connected with the inlet of the dust remover (2), and the outlet of the dust remover (2) is connected with the circulating ash returning bin (3);
circulating ash returns feed bin (3) is the space that forms through the outside of the cavity in desulfurizing tower venturi tube (12) outside and desulfurizing tower venturi tube (12), desulfurizing tower diffuser (13) of cladding for return circulating ash to the desulfurizing tower.
2. The circulating fluidized bed semi-dry desulfurization apparatus according to claim 1, wherein the upper portion of the cavity covering the outside of the venturi tube (12) of the desulfurization tower is opened in an inverted bell shape;
the middle part of the cavity covering the outer side of the Venturi tube (12) of the desulfurizing tower is of a hollow cylinder structure.
3. The circulating fluidized bed semi-dry desulfurization apparatus according to claim 1, wherein the lower portion of the chamber covering the outside of the venturi tube (12) of the desulfurization tower has a tapered structure, and the slope of the tapered surface is not less than 60 °; and the lower part of the cavity is in closed connection with the outer side of the top of the inlet section (11) of the desulfurizing tower.
4. The circulating fluidized bed semi-dry desulfurization apparatus according to claim 1, wherein the cross-section of the circulating ash return bin (3) is annular, and a space formed by the desulfurization tower venturi tube (12) or the desulfurization tower diffuser section (13) is an inner ring.
5. The circulating fluidized bed semi-dry desulfurization apparatus according to claim 1, wherein a feeding gap exists between the lower inner side of the cavity coated on the outer side of the desulfurization tower venturi tube (12) and the bottom of the desulfurization tower venturi tube (12); and the desulfurizing tower Venturi tube (12) is a component capable of moving up and down and is used for adjusting the size of the feeding gap formed between the bottom of the desulfurizing tower Venturi tube (12) and the inner side of the lower part of the cavity coated on the outer side of the desulfurizing tower Venturi tube (12).
6. The circulating fluidized bed semi-dry desulfurization apparatus according to claim 5, wherein the feeding gap is measured by a direct distance h between the bottom of the venturi tube (12) of the desulfurization tower and the lower portion of the chamber covering the outside of the venturi tube (12) of the desulfurization tower, for controlling the amount of returned circulating ash to the desulfurization tower.
7. The circulating fluidized bed semi-dry desulfurization apparatus according to claim 1, wherein the outlet of the dust collector (2) is connected to the circulating ash return bin (3) through an air chute or a mechanical transfer device.
8. The circulating fluidized bed semi-dry desulfurization apparatus according to claim 7, wherein the mechanical transfer means is a line (5).
9. The semi-dry desulfurization apparatus for circulating fluidized bed according to claim 1, wherein an ash flow valve (4) is provided on the mechanical transfer equipment for adjusting the amount of circulating ash entering the circulating ash storage bin (3).
10. The circulating fluidized bed semi-dry desulfurization apparatus according to claim 1, wherein the dust collector (2) is a bag collector.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120805483.8U CN215311427U (en) | 2021-04-19 | 2021-04-19 | Circulating fluidized bed semi-dry desulfurization device |
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|---|---|---|---|
| CN202120805483.8U CN215311427U (en) | 2021-04-19 | 2021-04-19 | Circulating fluidized bed semi-dry desulfurization device |
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| CN215311427U true CN215311427U (en) | 2021-12-28 |
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| CN202120805483.8U Active CN215311427U (en) | 2021-04-19 | 2021-04-19 | Circulating fluidized bed semi-dry desulfurization device |
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