CN111282726A - Pneumatic interference device, pneumatic cyclone separator and separation efficiency control method thereof - Google Patents
Pneumatic interference device, pneumatic cyclone separator and separation efficiency control method thereof Download PDFInfo
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- CN111282726A CN111282726A CN202010125937.7A CN202010125937A CN111282726A CN 111282726 A CN111282726 A CN 111282726A CN 202010125937 A CN202010125937 A CN 202010125937A CN 111282726 A CN111282726 A CN 111282726A
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- cyclone separator
- interference
- separation efficiency
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- air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
- B04C2009/008—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks with injection or suction of gas or liquid into the cyclone
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Abstract
The invention provides a pneumatic interference device, a pneumatic cyclone separator and a separation efficiency control method thereof. The invention provides a method for forming flying local adherent dust by opening a hole in a conical cylinder of a cyclone separator and introducing interference air, wherein the flying dust flows into an air outlet along with the ascending flow in the center of the separator, so that the separation efficiency of the cyclone separator is reduced, and the total circulating ash amount entering the furnace is reduced.
Description
Technical Field
The invention relates to the technical field of boilers, in particular to a pneumatic interference device, a pneumatic cyclone separator and a separation efficiency control method thereof.
Background
The new energy generating capacity and the occupation ratio of China rise year by year, but the new energy is unstable in power generation, is easily influenced by the external environment, and has the characteristics of intermittence and volatility. Therefore, after the new energy power generation is incorporated into the power grid for power generation in a large scale, close coordination and coordination are needed, the risk of unstable safety and stability of the new energy power generation is reduced, and the safe and stable operation of the power grid is ensured. In order to absorb new energy for power generation, the circulating fluidized bed boiler needs to participate in deep peak regulation increasingly frequently, which puts requirements on flexible operation of the circulating fluidized bed boiler, and meanwhile, the circulating fluidized bed boiler operates at a lower load when participating in the deep peak regulation, and if the original material circulation quantity is still kept, the temperature of a dense phase zone is reduced, and the safe and stable combustion of the boiler is influenced.
Theoretically, the suspension concentration at the upper part of the hearth can be reduced by reducing the circulating ash amount, the heat transfer coefficient is reduced, and the heat transfer temperature difference of the heating surface is improved, so that the average temperature of the hearth is improved. In order to reduce the amount of circulating ash, a plurality of boilers are additionally provided with an ash discharge system at a sealed return feeder, but the method increases investment, wastes energy and even can cause secondary pollution.
Disclosure of Invention
In view of the above, the present invention provides a pneumatic interference device, a cyclone separator, and a method for controlling separation efficiency of a cyclone separator, so as to control separation efficiency of the cyclone separator.
The invention provides a pneumatic interference device of a cyclone separator, which comprises an interference hole for introducing interference wind into the cyclone separator and an air supply mechanism communicated with the interference hole, wherein the interference hole is arranged on a conical barrel of the cyclone separator.
Preferably, the interference hole comprises a plurality of interference holes which are uniformly arranged on the conical barrel.
Preferably, the interference holes are distributed in an annular area on the conical barrel, the upper edge and the lower edge of the annular area are parallel, the upper edge is the top edge of the conical barrel, and the distance between the lower edge and the top edge is 1% -6% of the length of the inclined plane of the conical barrel.
Preferably, the air supply mechanism comprises a high-pressure air source, the high-pressure air source is communicated with the interference hole through a conveying pipeline, and the conveying pipeline is further provided with a flow control mechanism.
Preferably, the flow control mechanism comprises a flow meter and a control valve which are respectively arranged on the conveying pipeline.
Preferably, the wind speed of the disturbing wind is 0-70 m/s.
A second aspect of the invention provides a pneumatic cyclone separator provided with a pneumatic interference device.
A third aspect of the present invention provides a method for controlling separation efficiency of a cyclone separator, wherein disturbing air is introduced into the cyclone separator to change the separation efficiency of the cyclone separator.
Preferably, the control of the separation efficiency of the cyclone separator is achieved by varying the degree of interference of the flow-controlled interfering wind with the separation efficiency of the cyclone separator.
Preferably, the amount of air to achieve the disturbance is 0-1.1% of the total ventilation.
The invention provides a method for forming flying local adherent dust by opening a hole in a conical cylinder of a cyclone separator and introducing interference air, wherein the flying dust flows into an air outlet along with the ascending flow in the center of the separator, so that the separation efficiency of the cyclone separator is reduced, and the total circulating ash amount entering the furnace is reduced. The method can adjust the air volume of the interference air under different loads, thereby controlling the circulating ash volume required by the safe and stable operation of the boiler.
Drawings
FIG. 1 is a schematic diagram of a cyclone separator according to the prior art;
FIG. 2 is a schematic diagram of the configuration of the pneumatic perturbation device of the present invention;
FIG. 3 is a schematic view of the distribution of the disturbing holes on the cyclone;
fig. 4 is a schematic view of the expanded configuration of the annular region distributed over the conical drum.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description and accompanying drawings that illustrate the invention.
The invention provides a pneumatic interference device of a cyclone separator, which comprises an interference hole for introducing interference wind into the cyclone separator and an air supply mechanism communicated with the interference hole, wherein the interference hole is arranged on a conical barrel of the cyclone separator.
In the cyclone separator in the prior art, as shown in fig. 1, the upper portion of the cyclone separator 10 is cylindrical, the lower portion is a conical tube 101, a tangential inlet 102 is arranged on one side of the top end of the cyclone separator, the inlet 102 is arranged along the side wall of the cyclone separator, a material collecting port 103 is arranged at the bottom of the cyclone separator, an air outlet 104 is arranged at the top end of the cyclone separator, and a vertically downward central tube 105 is arranged at the air outlet 104.
In its particular operation, when dusty gas enters the cyclone from the tangential inlet 102, the gas flow changes from linear to circular motion, and a substantial portion of the rotating gas flow spirals down the inner wall of the cyclone towards the cone 101, commonly referred to as an outward vortex. The dust-containing gas generates a centrifugal force during rotation, and dust particles having a relative density greater than that of the gas are thrown against the inner wall surface of the tapered cylinder 101. Once the dust particles contact the wall surface of the extractor, they lose the radial inertia force and fall down along the wall surface by the action of downward momentum and gravity, and enter the collection port 103. When the swirling, descending, outward swirling air flow reaches the tapered barrel 101, the outward swirling air flow converges toward the center of the cyclone separator due to the conical contraction. According to the principle that the rotating moment is not changed, the tangential speed is continuously increased, and the centrifugal force borne by dust particles is continuously enhanced. When the airflow reaches a certain position at the lower end of the conical barrel 101, the airflow continuously spirally moves from the middle part of the cyclone separator to the upper part from the lower part in the same rotating direction, and thus, the internal cyclone airflow is formed. Finally, the purified gas is discharged through the air outlet 104.
Specifically, as shown in fig. 2, a pneumatic interference device 20 is arranged in a cyclone separator conical barrel 101, interference wind is introduced into the cyclone separator to enable local adherent particles to fly, the flying particles enter an ascending flow and are discharged into a tail flue, and separation efficiency is reduced.
Specifically, the aerodynamic interference device 20 includes an interference hole 201 for introducing interference wind into the cyclone separator 10 and an air supply mechanism 202 communicated with the interference hole 201, wherein the interference hole 201 is arranged on the conical barrel 101 of the cyclone separator 10; the air supply mechanism 202 introduces interference air into the cyclone separator 10 through the interference hole 201, and as the separation process of the cyclone separator 10 is specifically realized in the conical barrel 101, the interference hole 201 is arranged on the conical barrel 101, and the introduced interference air flies particles on the inner wall of the conical barrel 101, so that the dust discharge amount of the material collection port 103 is reduced, the separation of dust-containing gas is effectively interfered, and the separation efficiency of the cyclone separator 10 is influenced.
Further, as shown in fig. 3, in order to ensure the uniformity of the disturbance wind inlet, in a preferred embodiment of the present invention, the disturbance holes 201 include a plurality of holes, and are uniformly opened on the tapered cylinder 101.
Further, in order to ensure the disturbance rate of the disturbance wind, in a preferred embodiment of the present invention, the disturbance holes 201 are distributed in an annular area 1011 on the tapered cylinder 101, an upper edge and a lower edge of the annular area 1011 are parallel, the upper edge is the top edge of the tapered cylinder 101, and the distance from the lower edge to the top edge is 1% -6% of the length of the inclined plane of the tapered cylinder 101; in this region, the interference of the disturbance wind to the outward whirling airflow can only play a role, and beyond this region, the interference of the disturbance wind to the outward whirling airflow is not significant, because beyond this region, even if the particles form flying under the effect of the disturbance wind, the disturbance wind does not enter the air outlet 104 along with the inward whirling airflow, and the disturbance wind does not play a role of interference.
Further, as shown in fig. 2, in a specific embodiment of the present invention, the air supply mechanism 202 includes a high-pressure air source 2021, the high-pressure air source 2021 is communicated with the interference hole 201 through a delivery pipe 2022, and the delivery pipe 2022 is further provided with a flow control mechanism.
In this embodiment, the high-pressure air source 2021 may adopt plant compressed air, the plant compressed air is input to the interference hole 201 through the conveying pipe 2022 to form interference wind with a certain pressure, and meanwhile, the conveying pipe 2022 is further provided with a flow control mechanism, which can control the flow of the interference wind.
In a specific embodiment of the present invention, the flow control mechanism includes a flow meter 2023 and a control valve 2024 respectively disposed on the delivery pipe 2022. The flow meter 2023 monitors the wind speed, the wind speed is regulated and controlled through the control valve 2024, and the separation efficiency of the interference wind on the cyclone separator is regulated and controlled by controlling the wind speed of the interference wind.
In order to avoid that too high wind speeds have too great an influence on the separation efficiency of the cyclone separator, in a specific embodiment of the invention the wind speed of the disturbing wind at the disturbing hole 201 is 0-70 m/s.
A second aspect of the invention provides a cyclonic separator provided with the aerodynamic interference device of the above embodiments.
According to the invention, the cyclone separator is provided with the pneumatic interference device, and the holes are formed in the conical cylinder of the cyclone separator 10 and the interference air is introduced, so that local wall-attached dust in the cyclone separator is blown, the blown dust flows through the air outlet along with the ascending flow of the center of the cyclone separator, the separation efficiency of the cyclone separator is reduced, and the total circulating ash entering the furnace is reduced; the invention only needs to open a hole on the cone cylinder body of the cyclone separator, and the modification cost is lower compared with the modification of the traditional cyclone separator. The cyclone separator can be modified according to operation requirements, the separation efficiency of the cyclone separator is improved or reduced by changing the volume of the introduced interference air, and the flexibility is good, which cannot be realized by the traditional cyclone separator modification method.
A third aspect of the present invention provides a method for controlling separation efficiency of a cyclone separator, in which disturbing air is blown into the cyclone separator, thereby changing the separation efficiency of the cyclone separator.
Furthermore, the degree of interference of the flow control interference wind on the separation efficiency of the cyclone separator is changed by changing the flow control interference wind, so that the separation efficiency of the cyclone separator is controlled.
The invention provides a method for forming flying local adherent dust by opening a hole in a conical cylinder of a cyclone separator and introducing interference air, wherein the flying dust flows into an air outlet along with the ascending flow in the center of the separator, so that the separation efficiency of the cyclone separator is reduced, and the total circulating ash amount entering the furnace is reduced. And the method can adjust the air volume of the interference air under different loads, thereby controlling the circulating ash volume required by the safe and stable operation of the boiler.
In a preferred embodiment of the invention, multiple experiments prove that the disturbed air volume accounts for 0-1.1% of the total ventilation volume, so that the actual total ventilation volume can be calculated, and the control of the total ventilation volume can be better realized.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.
Claims (10)
1. A pneumatic interference apparatus for a cyclone separator, comprising: the pneumatic interference device comprises an interference hole for introducing interference air into the cyclone separator and an air supply mechanism communicated with the interference hole, and the interference hole is formed in a conical barrel of the cyclone separator.
2. The aerodynamic interference apparatus of a cyclone separator according to claim 1, wherein: the interference holes comprise a plurality of interference holes which are uniformly arranged on the conical cylinder.
3. The aerodynamic interference apparatus of a cyclone separator according to claim 2, wherein: the interference holes are distributed in an annular area on the conical barrel, the upper edge and the lower edge of the annular area are parallel, the upper edge is the top edge of the conical barrel, and the distance between the lower edge and the top edge is 1% -6% of the length of the inclined plane of the conical barrel.
4. The aerodynamic interference device of a cyclone separator according to claim 1, 2 or 3, characterized in that: the air supply mechanism comprises a high-pressure air source, the high-pressure air source is communicated with the interference hole through a conveying pipeline, and a flow control mechanism is further arranged on the conveying pipeline.
5. The aerodynamic interference apparatus of a cyclone separator according to claim 4, wherein: the flow control mechanism comprises a flow meter and a control valve which are respectively arranged on the conveying pipeline.
6. The aerodynamic interference device of a cyclone separator according to claim 1 or 2 or 3 or 5, characterized in that: the wind speed of the disturbance wind is 0-70 m/s.
7. A pneumatic cyclone separator, characterized by: the separator is provided with a pneumatic interference device according to any one of claims 1 to 4.
8. A method for controlling the separation efficiency of a cyclone separator is characterized in that disturbing air is introduced into the cyclone separator, so that the separation efficiency of the cyclone separator is changed.
9. The method of controlling separation efficiency of a cyclone separator according to claim 8, wherein: the control of the separation efficiency of the cyclone separator is realized by changing the interference degree of the flow control interference wind introduced into the interference wind on the separation efficiency of the cyclone separator.
10. The method of controlling separation efficiency of a cyclone separator according to claim 8, wherein: the air volume for realizing interference accounts for 0-1.1% of the total ventilation volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010125937.7A CN111282726A (en) | 2020-02-27 | 2020-02-27 | Pneumatic interference device, pneumatic cyclone separator and separation efficiency control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010125937.7A CN111282726A (en) | 2020-02-27 | 2020-02-27 | Pneumatic interference device, pneumatic cyclone separator and separation efficiency control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111282726A true CN111282726A (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010125937.7A Pending CN111282726A (en) | 2020-02-27 | 2020-02-27 | Pneumatic interference device, pneumatic cyclone separator and separation efficiency control method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2398508Y (en) * | 1999-09-29 | 2000-09-27 | 四川锅炉厂 | Water cooled cyclone separator |
| WO2000064321A1 (en) * | 1999-04-23 | 2000-11-02 | Lg Electronics Inc. | Device for reducing pressure loss of cyclone dust collector |
| CN2733179Y (en) * | 2004-07-26 | 2005-10-12 | 杨建华 | Boiler with circulated vulcanizing bed |
| CN201239669Y (en) * | 2008-08-01 | 2009-05-20 | 邱斌 | Cyclone dust remover of circulating fluid bed boiler |
| KR20180034763A (en) * | 2016-09-27 | 2018-04-05 | 한국에너지기술연구원 | Apparatus for controlling solid flow in circulating fluidized bed boiler |
| CN109530107A (en) * | 2018-12-03 | 2019-03-29 | 河北科技大学 | A kind of efficient, anti-coking cyclone separator |
| CN110145736A (en) * | 2019-06-21 | 2019-08-20 | 烟台龙源电力技术股份有限公司 | The adjusting method of cyclone separator, circulating fluidized bed boiler and the Effiency of whirlwind Separator |
-
2020
- 2020-02-27 CN CN202010125937.7A patent/CN111282726A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000064321A1 (en) * | 1999-04-23 | 2000-11-02 | Lg Electronics Inc. | Device for reducing pressure loss of cyclone dust collector |
| CN2398508Y (en) * | 1999-09-29 | 2000-09-27 | 四川锅炉厂 | Water cooled cyclone separator |
| CN2733179Y (en) * | 2004-07-26 | 2005-10-12 | 杨建华 | Boiler with circulated vulcanizing bed |
| CN201239669Y (en) * | 2008-08-01 | 2009-05-20 | 邱斌 | Cyclone dust remover of circulating fluid bed boiler |
| KR20180034763A (en) * | 2016-09-27 | 2018-04-05 | 한국에너지기술연구원 | Apparatus for controlling solid flow in circulating fluidized bed boiler |
| CN109530107A (en) * | 2018-12-03 | 2019-03-29 | 河北科技大学 | A kind of efficient, anti-coking cyclone separator |
| CN110145736A (en) * | 2019-06-21 | 2019-08-20 | 烟台龙源电力技术股份有限公司 | The adjusting method of cyclone separator, circulating fluidized bed boiler and the Effiency of whirlwind Separator |
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Application publication date: 20200616 |
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