CN213590131U - Semidry desulfurization ash extrinsic cycle returning charge device - Google Patents
Semidry desulfurization ash extrinsic cycle returning charge device Download PDFInfo
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- CN213590131U CN213590131U CN202022482991.5U CN202022482991U CN213590131U CN 213590131 U CN213590131 U CN 213590131U CN 202022482991 U CN202022482991 U CN 202022482991U CN 213590131 U CN213590131 U CN 213590131U
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Abstract
The utility model discloses a semidry process desulfurization ash extrinsic cycle returning charge device, the device includes: the desulfurized ash which is discharged from the desulfurizing tower and contains a certain unreacted absorbent is diverted to enter a cyclone separator for gas-solid separation; the solid particles collected by the cyclone separator pass through a desulfurized ash circulating bin below the cyclone separator and return to the desulfurizing tower to continue to participate in the reaction, and the process is circulated; the flue gas enters a dust remover after being desulfurized and entering a cyclone separator, and is discharged to a chimney through a draught fan; the lower part of the inflator is respectively connected with a return air chute and an outer ash discharge chute, and the return air chute is provided with a flow regulating valve for controlling the amount of desulfurized ash, regulating the thickness of a bed layer in the desulfurizing tower and maintaining the normal fluidization of the inside; the outer ash discharge chute is provided with the electric shutoff valve, the manual gate valve and the variable-frequency rotary feeder to control the amount of the discharged ash, so that the stability and the efficiency of the desulfurization system are ensured, and the investment cost is reduced.
Description
Technical Field
The utility model relates to a technical field is administered to the flue gas, concretely relates to semidry process desulfurization ash extrinsic cycle returning charge device.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.
At present, in order to meet the increasingly severe environmental requirements of the country, the CFB circulating fluidized bed semi-dry desulphurization technology is made out of the unique advantages, and the technology not only has the advantages of a dry desulphurization process, such as simple flow, less occupied land, no waste water, no need of antiseptic treatment for a chimney, low investment, comprehensive utilization of byproducts and the like, but also can reach the desulphurization efficiency of more than 98.5 percent at the highest under the condition of very low calcium-sulfur ratio; the semi-dry flue gas desulfurization by CFB circulating fluidized bed is a desulfurization technique suitable for national conditions of China, and is not only suitable for SO of large-scale, but also medium-and small-scale industrial boilers2The pollution and smoke dust synchronous treatment is an ideal method.
The inventor finds that in the traditional semi-dry desulfurization system, the desulfurization ash needs to be conveyed to the absorption tower by utilizing the desulfurization ash collected by each unit of the cloth bag/electric bag dust remover to participate in further chemical reaction, so that the retention time of a desulfurizing agent in the absorption tower is increased, and the operation cost is reduced. The traditional desulfurization ash external circulation material returning device is suitable for newly-built semi-dry desulfurization and dust removal integrated engineering, for some power plants, an original matched bag/electric bag dust remover only needs to be provided with a newly-built semi-dry desulfurization tower, and the structure of the original dust remover cannot meet the desulfurization ash external circulation condition, so that the desulfurization ash external circulation material returning device needs to be redesigned under the condition that the original dust remover is completely used for reducing the investment cost. Therefore, for some transformation projects, investment can be reduced to the maximum extent, energy can be saved, and consumption can be reduced.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the above-mentioned prior art, the utility model aims at providing a semidry process desulfurization ash extrinsic cycle returning charge device.
In order to solve the technical problem, the technical scheme of the utility model is that:
the utility model provides a semidry process desulfurization ash extrinsic cycle returning charge device which characterized in that includes: the desulfurizing tower, the cyclone dust collector, the circulating bin and the inflator pump are sequentially connected;
the flue gas outlet of the desulfurizing tower is connected with the inlet of a cyclone dust collector, and gas-solid separation is carried out through the cyclone dust collector; the discharge port of the cyclone separator is connected with a circulating bin, solid particles collected by the cyclone dust collector return to the absorption tower to continue to take part in the reaction, and the gas outlet of the cyclone separator is connected with the dust collector and is discharged to a chimney through a draught fan; the bottom of the circulating bin is connected with an inflator pump, and the lower part of the inflator pump is respectively connected with a return gasification air chute and an outer ash discharge chute.
The circulating stock bin is provided with a high level indicator, a medium level indicator and a low level indicator.
And a feeding gate valve is arranged at the upper part of the inflator pump.
One end of the return gasification air chute is connected with the inflator pump, and the other end of the return gasification air chute is connected with the diameter expansion section of the desulfurizing tower.
And a return chute flow regulating valve is arranged on the return gasification air chute.
One end of the outer ash discharge chute is connected with the inflator pump, and the other end of the outer ash discharge chute is connected with the ash falling pipe.
An electric shutoff valve, a manual gate valve, a variable-frequency rotary feeder and a desulfurization ash ejector are arranged on the outer ash discharge chute.
And the conical sections of the cyclone dust collector and the circulating bin are provided with heating devices.
The heating device adopts a steam heating element.
The dust remover can be a bag dust remover or an electric bag dust remover.
The utility model has the advantages that:
for some transformation projects, an electric bag/cloth bag dust remover is arranged in an original factory area, the structure of the original dust remover cannot meet the condition of external circulation of desulfurization ash, the semidry desulfurization ash external circulation material returning device can be utilized, and the investment cost is reduced to the maximum extent on the premise of ensuring the stability and the desulfurization efficiency of a semidry desulfurization system.
Drawings
The accompanying drawings are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification.
Fig. 1 is a schematic structural diagram of the present invention;
labeled as: 1. a desulfurizing tower; 2. a cyclone separator; 3. circulating a stock bin; 4. a dust remover; 5. an inflator; 6. feeding a gate valve; 7. a flow regulating valve; 8. an electrically operated shutoff valve; 9. a return gasification air chute; 10. a manual gate valve; 11. a variable-frequency rotary feeder; 12. a desulfurized fly ash ejector; 13. a steam heating element; 14. a dust storehouse; 15. a chute fluidization fan; 16. and a desulfurized fly ash conveying fan.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, the utility model discloses a semidry desulfurization ash extrinsic cycle returning charge device, includes: the desulfurizing tower 1, the cyclone separator 2, the circulating bin 3 and the inflator pump 5 are connected in sequence;
the flue gas outlet of the desulfurizing tower 1 is connected with the inlet of the cyclone separator 2, and gas-solid separation is carried out through the cyclone separator 2; a discharge port of the cyclone separator 2 is connected with a circulating bin 3, solid particles collected by the cyclone separator 2 return to the desulfurizing tower 1 to continue to take part in the reaction, and an air outlet of the cyclone separator 2 is connected with a dust remover 4 and is discharged to a chimney through a draught fan; the bottom of the circulating bin 3 is connected with an inflator pump 5, and the lower part of the inflator pump 5 is respectively connected with a return gasification air chute 9 and an outer ash discharge chute.
The desulfurized ash containing a certain unreacted absorbent and coming out of the desulfurizing tower 1 is carried by the gas flow and discharged from an outlet at the top of the desulfurizing tower 1, and then turns to enter a cyclone separator 2 for gas-solid separation. The solid particles collected by the cyclone separator 2 pass through the desulfurized ash circulating bin 3 below the cyclone separator 2 and return to the desulfurizing tower 1 to continue to take part in the reaction, and the reaction is circulated (external circulation) in this way. And the redundant small amount of desulfurization ash is conveyed into the ash storage 14 through pneumatic conveying and then discharged outside through a tank truck or a secondary conveying device. The flue gas enters a cyclone separator 2 after desulfurization, enters a bag/electric bag dust collector 4, and is finally discharged to a chimney through a draught fan.
In the circulating process of the desulfurization ash, as the fly ash of the boiler, the desulfurizer and the sulfur dioxide in the flue gas continuously react, the circulating material quantity is continuously increased, and the resistance of the absorption tower is continuously increased, when the resistance of the absorption tower is increased to a set value, the rotating opening degree of a flow control valve on a return air chute needs to be reduced, so that the circulating ash quantity is reduced, and the resistance is reduced; when the ash amount in the desulfurizing tower 1 is less, the resistance is reduced to a set value, and the rotating opening degree of the flow regulating valve 7 on the ash return material air chute 9 needs to be improved, so that the circulating ash amount is increased, and the resistance is increased. Because a desulfurizing agent is continuously and newly added into the desulfurizing tower 1 to react with sulfur dioxide in flue gas and fly ash in a boiler is gathered, more and more fly ash is captured by the circulating bin 3 below the cyclone separator 2, and under the condition that the circulating ash amount is basically unchanged, a small amount of residual desulfurizing ash slag is pneumatically conveyed into the ash bin 14 and then discharged outside through a tank truck or a secondary conveying device.
Preferably, considering that the dust concentration of the semi-dry desulfurization outlet is as high as 600-3Therefore, the cyclone dust collector is internally lined with high-strength wear-resistant plastic material and is fixed by using the tortoise shell net.
Preferably, the circulating bin 3 connected with the cyclone dust collector 2 is used for collecting and storing desulfurization ash, and high, medium and low material level meters are arranged at reasonable positions of the circulating bin, so that the structural stability can be influenced for a long time due to too high material level, and the desulfurization efficiency can not be influenced due to too low material level because the thickness of a bed layer in the desulfurization tower 1 cannot be ensured; therefore, the material level meter can ensure that the circulating bin stably feeds the desulfurizing tower and maintains the fluidization state inside the desulfurizing tower.
Preferably, an inflator pump 5 is connected with the circulating bin 3, and a feeding gate valve 6 is arranged at the upper part of the inflator pump 5 and is used for overhauling a return air chute 9 and an outer ash discharge chute;
preferably, a material returning air chute 9 is connected with one end of the lower part of the inflator 5, a flow regulating valve 7 is arranged on the material returning air chute 9, the amount of the desulfurized ash is controlled by regulating the rotating opening degree of the flow regulating valve 7, the thickness of a bed layer in the desulfurizing tower is regulated, and the normal fluidization in the desulfurizing tower is maintained;
preferably, an outer ash discharge chute is connected with the other end of the lower part of the inflator pump 5, an electric shutoff valve 8, a manual gate valve 10 and a variable-frequency rotary feeder 11 are arranged on the outer ash discharge chute, and the outer ash discharge amount is controlled by the rotating speed of the variable-frequency rotary feeder 11;
preferably, the cyclone separator 2 and the conical sections of the circulating bin 3 need to be provided with heating devices, so that the temperature of the desulfurized ash is ensured, condensation and hardening of materials are avoided, and the flowability of the ash is ensured. The heating device adopts the steam heating element 13, and the steam heating element 13 is easy to control, uniform in heating, low in energy consumption, good in economical efficiency, simple in system and small in maintenance amount; and meanwhile, a thermal resistor is used for feedback.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The utility model provides a semidry process desulfurization ash extrinsic cycle returning charge device which characterized in that includes: the desulfurizing tower, the cyclone dust collector, the circulating bin and the inflator pump are sequentially connected;
the flue gas outlet of the desulfurizing tower is connected with the inlet of a cyclone dust collector, and gas-solid separation is carried out through the cyclone dust collector; the discharge port of the cyclone separator is connected with a circulating bin, solid particles collected by the cyclone dust collector return to the absorption tower to continue to take part in the reaction, and the gas outlet of the cyclone separator is connected with the dust collector and is discharged to a chimney through a draught fan; the bottom of the circulating bin is connected with an inlet of an inflator pump, and an outlet of the inflator pump is respectively connected with a return gasification air chute and an outer ash discharge chute.
2. The semidry desulfurized ash external circulation material returning device according to claim 1, wherein said circulation bunker is provided with high, medium and low level gauges.
3. The external circulation returning device for the semi-dry desulfurized ash according to claim 1, wherein a feeding gate valve is arranged at the inlet of the inflator.
4. The external circulation return device for desulfurized ash from semi-dry process according to claim 1, wherein one end of said return gasification air chute is connected to an inflator pump, and the other end is connected to the diameter-expanded section of the desulfurizing tower.
5. The semidry desulfurized ash external circulation return device according to claim 1, wherein said return gasification air chute is provided with a return chute flow regulating valve.
6. The external circulation returning charge device for the semi-dry desulfurized fly ash as claimed in claim 1, wherein one end of said external ash discharge chute is connected to an inflator pump, and the other end is connected to an ash discharge pipe.
7. The semidry desulfurization ash external circulation material returning device is characterized in that an electric shutoff valve, a manual gate valve, a variable-frequency rotary feeder and a desulfurization ash ejector are arranged on the external ash discharge chute.
8. The semidry desulfurized ash external circulation material returning device according to claim 1, wherein the cyclone dust collector and the conical section of the circulation bin are provided with heating devices.
9. The external circulation returning charge device of semi-dry desulfurized ash according to claim 8, wherein said heating device uses steam heating element.
10. The semidry desulfurization ash external circulation material returning device as claimed in claim 1, wherein the dust collector can be a bag dust collector or an electric bag dust collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022482991.5U CN213590131U (en) | 2020-10-30 | 2020-10-30 | Semidry desulfurization ash extrinsic cycle returning charge device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022482991.5U CN213590131U (en) | 2020-10-30 | 2020-10-30 | Semidry desulfurization ash extrinsic cycle returning charge device |
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| CN213590131U true CN213590131U (en) | 2021-07-02 |
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| CN202022482991.5U Active CN213590131U (en) | 2020-10-30 | 2020-10-30 | Semidry desulfurization ash extrinsic cycle returning charge device |
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