CN212565747U - Anti-abrasion and anti-blocking device of flue gas recirculation system - Google Patents
Anti-abrasion and anti-blocking device of flue gas recirculation system Download PDFInfo
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- CN212565747U CN212565747U CN202020465203.9U CN202020465203U CN212565747U CN 212565747 U CN212565747 U CN 212565747U CN 202020465203 U CN202020465203 U CN 202020465203U CN 212565747 U CN212565747 U CN 212565747U
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- flue
- guide plate
- recirculation
- flue gas
- cleaning device
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Abstract
The utility model discloses an anti-abrasion and anti-blocking device of a flue gas recirculation system, which comprises a first flue, a first guide plate, a second flue, a second guide plate, a cleaning device and a recirculation fan; the two ends of the first flue and the second flue are connected and communicated, the recirculation fan is connected and communicated with the side part of the second flue, the first guide plate is arranged at the joint of the first flue and the second flue, the cleaning device is arranged in the second flue, the second guide plate is erected above the cleaning device, and the flue gas sequentially passes through the first flue, the first guide plate, the second flue, the second guide plate and the recirculation fan. The utility model has the advantages that: the dust in the recirculated flue gas is prevented from accumulating in the recirculated flue gas flue, the stability and the safety of the system are improved, and the service life of the equipment is prolonged.
Description
Technical Field
The utility model relates to a power plant boiler auxiliary assembly field especially relates to a flue gas recirculation system.
Background
The secondary reheating technology is the world leading coal-fired power generation technology at present and is a main method for improving the thermal efficiency of the current thermal power generating unit. As a main means for adjusting the temperature of the main reheating steam, particularly the temperature of the secondary reheating steam, the flue gas recirculation is widely applied to domestic secondary reheating and conventional large-scale thermal power generating units. The flue gas recirculation technology is a combustion mode that part of flue gas generated by combustion enters a hearth again and then is mixed with an oxidant to participate in the combustion process again, and different flue gas recirculation rates have important influences on combustion stability, burnout rate and NOx generation and also influence the convection heat absorption capacity of a tail heating surface. However, the middle-temperature and high-temperature flue gas generated after combustion does not pass through the dust removal equipment and enters the hearth again through the flue gas recirculation fan, and the flue gas contains a large amount of dust, so that the dust is seriously accumulated in the flue gas of the flue gas recirculation system, the flue gas recirculation fan is greatly abraded, and the service life of the equipment is seriously shortened.
The current flue gas recirculation system, after considering to lead the recirculated flue gas from the electrostatic precipitator, avoids the wearing and tearing of dust in the recirculated flue gas to the recirculation fan, but the recirculated flue gas temperature is too low, and is relatively poor to the regulation nature of main reheat steam temperature. And the other is that the conventional recirculated flue gas is introduced into a flue at the tail part of the boiler before the electric dust removal, and the high-temperature dust-containing flue gas enters a hearth after being pressurized by a recirculation fan. The existing design considers that an anti-abrasion outer lining is additionally arranged on a blade of a recirculation fan, but the anti-abrasion effect is poor in actual operation, the blade of the recirculation fan needs to be integrally replaced in 3-6 months, and the safety and the stability of a unit are seriously affected. An ash hopper is also added at the lowest part of the recycling system, but the ash removing effect is not good.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve lies in: the problems that in the prior art, dust is seriously accumulated in a flue of a flue gas recirculation system, a flue gas recirculation fan is greatly abraded, and the service life of equipment is seriously shortened are solved.
The utility model discloses a following technical means realizes solving above-mentioned technical problem:
an abrasion-proof and anti-blocking device of a flue gas recirculation system comprises a first flue, a first guide plate, a second flue, a second guide plate, a cleaning device and a recirculation fan; the two ends of the first flue and the second flue are connected and communicated, the recirculation fan is connected and communicated with the side part of the second flue, the first guide plate is arranged at the joint of the first flue and the second flue, the cleaning device is arranged in the second flue, the second guide plate is erected above the cleaning device, and the flue gas sequentially passes through the first flue, the first guide plate, the second flue, the second guide plate and the recirculation fan.
The utility model discloses under the effect of recirculation fan, the part flue gas after burning furnace is as the recirculation flue gas and gets into first flue at first from boiler afterbody flue, first guide plate, the second flue, the second guide plate, get into boiler furnace after being pressurized by recirculation fan, the water conservancy diversion effect and the inertial force effect of two guide plates in this process, make two air currents at both ends form the vortex in second flue bottom, the vast majority of large granule dust gathers in second flue lower part formation deposit, and continuously clear away the deposition by cleaning device, first of all, avoid the dust in the recirculation flue gas to gather in the recirculation flue gas, lead to flow area to reduce, and then cause the on-way resistance to increase and influence system's stability of exerting oneself; secondly, the problem of flue collapse caused by dust accumulation in the flue is avoided, and the system safety is improved; finally, the dust content of the flue gas at the inlet of the flue gas recirculation fan is reduced, the abrasion of the flue gas recirculation fan is reduced, and the service life of the equipment is greatly prolonged.
Preferably, the first flue is a vertically arranged flue, and the second flue is a horizontally arranged flue.
Preferably, the dust collector further comprises an ash hopper for collecting dust, wherein the ash hopper is communicated with the second flue and is arranged below the end part of the cleaning device.
Preferably, the ash bucket further comprises a ball valve, and the ball valve is arranged at the bottom of the ash bucket. The dust is continuously scraped into the dust hoppers concentrated on the two sides through the cleaning device, and the regular discharge of the dust stored in the dust hoppers is realized by controlling ball valves at the bottoms of the dust hoppers.
Preferably, the cleaning device is a belt conveyor, a plurality of scraper blades evenly arranged at intervals are arranged on a belt of the belt conveyor, and the scraper blades are vertically arranged on the belt of the belt conveyor.
Preferably, the first guide plate is an arc-shaped guide plate, the width of the first guide plate is the thickness of the first flue, the lower edge of the first guide plate is tangent to the horizontal direction of the top of the cleaning device, and the upper edge of the first guide plate is tangent to the outer wall of the first flue.
Preferably, the second guide plate is an arc-shaped guide plate, the lower edge of the second guide plate is tangent to the top horizontal direction of the cleaning device, the upper edge of the second guide plate is perpendicular to the second flue, and the radius of the second guide plate is 1/2 of the height of the second flue.
Preferably, the air conditioner further comprises a first guide plate support and a second guide plate support, wherein the first guide plate support is connected between the bottom surface of the first guide plate and the bottom surface of the second flue, and the second guide plate support is connected between the bottom surface of the second guide plate and the bottom surface of the second flue.
Preferably, the number of the recirculation fans is even, and the recirculation fans are symmetrically and uniformly arranged along the second flue.
Preferably, the flue gas treatment device further comprises an even number of inlet pipelines of the recirculation fans, the recirculation fans are connected with the side wall of the second flue through the inlet pipelines of the recirculation fans, the lengths of the inlet pipelines of the even number of recirculation fans are smaller than that of the second guide plate, and the inlet pipelines of the recirculation fans are arranged obliquely downwards.
The utility model has the advantages that:
(1) the utility model discloses under the effect of recirculation fan, the part flue gas after burning furnace is as the recirculation flue gas and gets into first flue at first from boiler afterbody flue, first guide plate, the second flue, the second guide plate, get into boiler furnace after being pressurized by recirculation fan, the water conservancy diversion effect and the inertial force effect of two guide plates in this process, make two air currents at both ends form the vortex in second flue bottom, the vast majority of large granule dust gathers in second flue lower part formation deposit, and continuously clear away the deposition by cleaning device, first of all, avoid the dust in the recirculation flue gas to gather in the recirculation flue gas, lead to flow area to reduce, and then cause the on-way resistance to increase and influence system's stability of exerting oneself; secondly, the problem of flue collapse caused by dust accumulation in the flue is avoided, and the system safety is improved; finally, the dust content of the flue gas at the inlet of the flue gas recirculation fan is reduced, the abrasion of the flue gas recirculation fan is reduced, and the service life of the equipment is greatly prolonged.
(2) The dust is continuously scraped into the dust hoppers concentrated on the two sides through the cleaning device, and the regular discharge of the dust stored in the dust hoppers is realized by controlling ball valves at the bottoms of the dust hoppers.
Drawings
Fig. 1 is a schematic structural view of an anti-abrasion and anti-blocking device of a flue gas recirculation system according to an embodiment of the present invention;
fig. 2 is a side view of an anti-abrasion and anti-blocking device of a flue gas recirculation system according to an embodiment of the present invention.
Reference numbers in the figures: the device comprises a first flue 1, a second flue 2, an ash bucket 21, a ball valve 22, a first guide plate 3, a second guide plate 4, a recirculation fan 5 and a cleaning device 6.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, an abrasion-proof and blocking-proof device of a flue gas recirculation system comprises a first flue 1, a second flue 2, a first guide plate 3, a second guide plate 4, a recirculation fan 5 and a cleaning device 6; the cleaning device 6 is arranged in the second flue 2;
As shown in fig. 2, the second guide plate 4 is installed in the second flue 2, the second guide plate 4 is an arc-shaped guide plate, specifically, an 1/4 circle, the lower edge of the second guide plate 4 is tangent to the top horizontal direction of the cleaning device 6 and is parallel to the horizontal section of the inlet duct 51, the upper edge of the second guide plate 4 is perpendicular to the second flue 2, the radius of the second guide plate 4 is 1/2 of the height of the second flue 2, and the vertical tangent of the second guide plate 4 coincides with the vertical plane of the second flue 2; the second guide plate 4 is arranged above the cleaning device 6.
In the embodiment, under the action of a recirculation fan 5, part of flue gas after combustion of a hearth is taken as recirculation flue gas and firstly enters a first flue 1, a first guide plate 3, a second flue 2 and a second guide plate 4 from a tail flue of a boiler, and then enters a hearth of the boiler after being pressurized by the recirculation fan 5, and in the process, the guide action and the inertia force action of the two guide plates enable two air flows at two ends to form vortex at the bottom of the second flue 2, most of large-particle dust is gathered at the lower part of the second flue 2 to form deposition, and the deposited dust is continuously removed by a cleaning device 6; secondly, the problem of flue collapse caused by dust accumulation in the flue is avoided, and the system safety is improved; finally, the dust content of the flue gas at the inlet of the flue gas recirculation fan is reduced, the abrasion of the flue gas recirculation fan is reduced, and the service life of the equipment is greatly prolonged.
Example two:
as shown in fig. 1 and fig. 2, in the first embodiment, the two ends of the second flue 2 further include an ash hopper 21 for collecting dust, and the ash hopper 21 is communicated with the second flue 2 and disposed below the end of the cleaning device 6; the second flue 2 is of a symmetrical structure, and the number of the ash hoppers 21 is two.
The bottom of the ash bucket 21 also comprises a ball valve 22, dust is continuously scraped into the ash buckets 21 concentrated on two sides through the cleaning device 6, and the regular discharge of the ash stored in the ash buckets 21 is realized by controlling the ball valve 22 at the bottom of the ash buckets 21.
In this embodiment, two cleaning devices 6 are symmetrically arranged at the bottom of the second flue 2, and the two cleaning devices 6 have opposite rotation directions; cleaning device 6 is the belt feeder, can be driven by the motor and rotate, is equipped with the scraper blade that a plurality of intervals set up on the belt of belt feeder, and the scraper blade is vertical to be installed on the belt of belt feeder, and the scraper blade can be scraped the ash to the ash bucket in.
Example three:
as shown in fig. 1 and fig. 2, on the basis of the first or second embodiment, the wear-resistant and anti-blocking device of the flue gas recirculation system further includes a first baffle bracket and a second baffle bracket, the first baffle bracket is connected between the bottom surface of the first baffle 3 and the bottom surface of the second flue 2, and the second baffle bracket is connected between the bottom surface of the second baffle 4 and the bottom surface of the second flue 2. Because the bottom of the first guide plate 3 is parallel to the cleaning device 6, the first guide plate 3 needs to be erected above the cleaning device 6, so that a structure of two support legs can be adopted, the first guide plate 3 is connected between the second flue 2 and the first guide plate, and the first guide plate support can be a plurality of support legs with different heights; the second guide plate support adopts the supporting leg structure equally, and the second guide plate support is a plurality of equally, and even interval sets up. The first guide plate support and the second guide plate support can stably support the first guide plate 3 and the second guide plate 4.
The first baffle bracket and the second baffle bracket are required to be capable of supporting the first baffle 3 and the second baffle 4 without interfering with the sweeping device 6, and other forms and structures are also possible without specific limitation.
Example four:
as shown in fig. 1 and fig. 2, on the basis of any one of the first, second and third embodiments, in this embodiment, an even number of the recirculation fans 5 are symmetrically and uniformly arranged along the second flue 2, and an even number of the inlet ducts 51 of the recirculation fans are symmetrically arranged, two recirculation fans 5 are shown in fig. 1, and two inlet ducts 51 are shown in fig. 1.
Correspondingly, the recirculation fan 5 is connected with the side wall of the second flue 2 through the inlet pipelines 51, and in order to ensure that the air flow smoothly enters the inlet pipelines 51 after changing the wind direction, the lengths of the two inlet pipelines 51 are smaller than that of the second guide plate 4.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. An abrasion-proof and anti-blocking device of a flue gas recirculation system is characterized by comprising a first flue, a first guide plate, a second flue, a second guide plate, a cleaning device and a recirculation fan; the two ends of the first flue and the second flue are connected and communicated, the recirculation fan is connected and communicated with the side part of the second flue, the first guide plate is arranged at the joint of the first flue and the second flue, the cleaning device is arranged in the second flue, the second guide plate is erected above the cleaning device, and the flue gas sequentially passes through the first flue, the first guide plate, the second flue, the second guide plate and the recirculation fan.
2. The wear and blockage preventing device of claim 1, wherein the first flue is a vertically arranged flue and the second flue is a horizontally arranged flue.
3. The apparatus of claim 1, further comprising a dust hopper for collecting dust, the dust hopper being in communication with the second flue and being disposed below the end of the cleaning apparatus.
4. The wear and blockage preventing device of claim 3, further comprising a ball valve disposed at the bottom of the ash hopper.
5. The abrasion-proof and anti-blocking device for the flue gas recirculation system according to claim 1, wherein the cleaning device is a belt conveyor, a plurality of uniformly spaced scraper blades are arranged on a belt of the belt conveyor, and the scraper blades are vertically arranged on the belt of the belt conveyor.
6. The wear and blockage preventing device of claim 1, wherein the first flow guide plate is an arc-shaped flow guide plate, the width of the first flow guide plate is the thickness of the first flue, the lower edge of the first flow guide plate is tangent to the horizontal direction of the top of the cleaning device, and the upper edge of the first flow guide plate is tangent to the outer wall of the first flue.
7. The wear and blockage preventing device of claim 1, wherein the second flow guide plate is an arc-shaped flow guide plate, the lower edge of the second flow guide plate is tangent to the horizontal direction of the top of the cleaning device, the upper edge of the second flow guide plate is perpendicular to the second flue, and the radius of the second flow guide plate is 1/2 of the height of the second flue.
8. The wear and blockage preventing device of claim 1, further comprising a first baffle bracket and a second baffle bracket, wherein the first baffle bracket is connected between the bottom surface of the first baffle and the bottom surface of the second flue, and the second baffle bracket is connected between the bottom surface of the second baffle and the bottom surface of the second flue.
9. The wear and block resistant device of claim 1 wherein there are an even number of recirculation fans symmetrically and uniformly arranged along the second flue.
10. The wear and blockage preventing device for the flue gas recirculation system according to claim 9, further comprising an even number of inlet pipes of the recirculation fans, wherein the recirculation fans are connected with the side wall of the second flue through the inlet pipes of the recirculation fans, the lengths of the inlet pipes of the even number of recirculation fans are smaller than that of the second guide plate, and the inlet pipes of the recirculation fans are arranged obliquely downwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020465203.9U CN212565747U (en) | 2020-04-01 | 2020-04-01 | Anti-abrasion and anti-blocking device of flue gas recirculation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020465203.9U CN212565747U (en) | 2020-04-01 | 2020-04-01 | Anti-abrasion and anti-blocking device of flue gas recirculation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212565747U true CN212565747U (en) | 2021-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020465203.9U Expired - Fee Related CN212565747U (en) | 2020-04-01 | 2020-04-01 | Anti-abrasion and anti-blocking device of flue gas recirculation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212565747U (en) |
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2020
- 2020-04-01 CN CN202020465203.9U patent/CN212565747U/en not_active Expired - Fee Related
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Granted publication date: 20210219 |