CN215929531U - Anti-abrasion device and low-temperature economizer - Google Patents
Anti-abrasion device and low-temperature economizer Download PDFInfo
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- CN215929531U CN215929531U CN202120939129.4U CN202120939129U CN215929531U CN 215929531 U CN215929531 U CN 215929531U CN 202120939129 U CN202120939129 U CN 202120939129U CN 215929531 U CN215929531 U CN 215929531U
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Abstract
The utility model discloses an anti-abrasion device and a low-temperature economizer, wherein the anti-abrasion device comprises a plurality of flow guide parts, a rectifying part and an anti-abrasion part, the flow guide parts are arranged at the junction of a small-diameter section and a gradually-expanding section of an upstream flue of the low-temperature economizer, the rectifying part is arranged in a large-diameter section of the upstream flue and is adjacent to the gradually-expanding section, the anti-abrasion part is arranged in the large-diameter section, the flow guide parts are sequentially arranged at intervals in the width direction of the upstream flue, each flow guide part comprises a flow guide plate, a flow guide pore plate and a turbulence plate, the upstream end of the flow guide pore plate is connected with the downstream end of the flow guide plate, the upstream end of the turbulence plate is connected with the downstream end of the flow guide plate, the flow guide plate is parallel to the central axis of the upstream flue, the flow guide pore plate is inclined towards the direction far away from the central axis relative to the flow guide pore plate, and the turbulence plate is inclined towards the direction far away from the central axis relative to the flow guide pore plate. The scheme can effectively relieve the problem of leakage of the heat exchange pipe due to too fast abrasion, and effectively ensures the long-term stable and efficient operation of the low-temperature economizer.
Description
Technical Field
The utility model relates to the technical field of environment-friendly and energy-saving equipment, in particular to an anti-abrasion device and a low-temperature economizer comprising the same.
Background
The low-temperature economizer is important equipment in low-temperature and low-temperature electric dust removal technology, and is arranged in a flue in front of dust removal equipment, is in a high-dust environment, and is easy to cause abrasion and leakage of a heat exchange tube of a heat exchange device under the scouring action of dust. When the abrasion condition is serious and water leakage is not found in time, a large amount of water leaked may enter an ash bucket of the electric dust collector to cause hardening of dust, so that not only is the dust conveying influenced, but also the normal operation of the electric dust collector is influenced. The problem of leakage caused by over-quick abrasion of the heat exchange tube restricts the further popularization and application of the low-low temperature electric dust removal technology.
The abrasion of the heat exchange tube is closely related to the velocity distribution of the flue gas and the concentration distribution of the dust, and when the velocity distribution of the flue gas and the concentration distribution of the dust in the low-temperature economizer are more uneven, the abrasion of the heat exchange tube is more serious. Generally, because the flow velocity of flue gas flowing through a low-temperature economizer needs to be controlled so as to reduce the abrasion of a heat exchange tube and improve the heat exchange efficiency, a gradually expanding section is arranged on an air inlet flue of the low-temperature economizer, and a contracting section is arranged on an air outlet flue of the low-temperature economizer, the structure is easy to cause the uneven distribution of the flue gas velocity and the dust concentration.
The flow guide device is additionally arranged at the upper part of the heat exchange device of the low-temperature economizer, which is one of measures for relieving the abrasion of the heat exchange tube, but the existing low-temperature economizer additionally provided with the flow guide device has unsatisfactory effect of relieving the abrasion, and even has the phenomenon that the local part of the heat exchange tube is more seriously abraded than before the flow guide device is additionally arranged. In view of this, how to effectively alleviate the abrasion of the heat exchange tube of the low-temperature economizer is a technical problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides an anti-abrasion device which is arranged in an upstream flue of a low-temperature economizer, wherein the anti-abrasion device comprises a plurality of flow guide components, each flow guide component comprises a flow guide plate and a flow guide pore plate, the upstream end of each flow guide pore plate is connected with the downstream end of each flow guide plate, and the flow guide plates of the flow guide components are parallel to each other; the flow guide parts are sequentially arranged at intervals in the width direction of the upstream flue, the drainage plate of each flow guide part is parallel to the central axis, the flow guide pore plate is inclined relative to the drainage plate in the direction far away from the central axis, and the included angle alpha 1 between the flow guide pore plate and the drainage plate is an obtuse angle.
In one embodiment, the flow guiding component further comprises a turbulence plate, an upstream end of the turbulence plate is connected with a downstream end of the flow guiding pore plate, the turbulence plate is inclined relative to the flow guiding pore plate in a direction away from the central axis, an included angle α 3 between the turbulence plate and the flow guiding pore plate is an obtuse angle, the turbulence plate comprises a plurality of plates, and each plate is sequentially arranged at intervals along a downstream end edge of the flow guiding pore plate.
In one embodiment, the included angle α 1 of each of the flow guiding components located on the same side of the central axis is different in size, specifically: the angle α 1 of the flow guide member further from the central axis is larger.
In one embodiment, the difference α 2 between the angles α 1 of adjacent flow guide elements on the same side of the central axis is not greater than 8 °.
In one embodiment, the range of the opening ratio of the flow guide hole plate is as follows: 20% -50%, the aperture of a single hole is less than 30mm, and the area range of a single plate of the turbulence plate (313) is as follows: 400mm2～1600mm2。
In one embodiment, the wear protection device further comprises a flow straightening member in a grid structure, the flow straightening member being arranged downstream of the flow guide member.
In one embodiment, the wear prevention device further comprises a wear prevention member disposed downstream of the rectifying member, the wear prevention member comprises a plurality of tube rows, each tube row is sequentially arranged along the central axis at intervals, and each tube row comprises a plurality of wear prevention tubes.
In one embodiment, the wear member and the fairing member are spaced apart by no less than 200 mm.
In one embodiment, the anti-wear pipe is a circular pipe or an elliptical pipe, the diameter of the circular pipe or the minor diameter of the elliptical pipe is the same as the diameter of a heat exchange pipe of a heat exchange device of the low-temperature economizer, and the distance between two adjacent anti-wear pipes is the same as the distance between two adjacent heat exchange pipes of the heat exchange device.
The utility model also provides a low-temperature economizer which comprises a heat exchange device and an anti-abrasion device, wherein the anti-abrasion device adopts any one of the anti-abrasion devices; an upstream flue of the low-temperature economizer is sequentially provided with a small constant diameter section, a gradually expanding section and a large constant diameter section from upstream to downstream, and the heat exchange device is arranged in the large constant diameter section; the flow guide component is arranged at the junction position of the divergent section and the small-diameter section, the rectifying component is arranged in the large-diameter section and is adjacent to the divergent section, and the anti-abrasion component is arranged in the large-diameter section and is positioned between the rectifying component and the heat exchange device.
According to the scheme, the flow guide pore plate and the flow guide plate are arranged, the gas-phase flow and the dust flow can be divided into two parts by combining the two parts, one part of the gas-phase flow and the dust flow extends to the gradually expanding section of the low-temperature economizer under the drainage effect of the flow guide plate, the other part of the gas-phase flow and the dust flow passes through the through hole of the flow guide pore plate 312 and continues to flow downstream, and therefore the gas-phase flow and the dust flow can be kept in a uniform distribution state when flowing through the heat exchange device, and oblique dust particle jet flow cannot occur, and therefore the abrasion problem of the heat exchange tube can be effectively relieved.
Compared with the traditional low-temperature economizer with the flow guide device, the low-temperature economizer with the anti-abrasion device can greatly reduce the abrasion rate of the heat exchange tube, effectively relieve the problem of leakage of the heat exchange tube due to too fast abrasion, and effectively ensure long-term stable and efficient operation of the low-temperature economizer.
Drawings
FIG. 1 is a top view of one embodiment of a low temperature economizer provided in accordance with the present invention;
fig. 2 is an enlarged view of a guide member on an upper side of a central axis of the low-temperature economizer.
FIG. 3 is a left side view of a single flow directing member;
fig. 4 is a flow field comparison diagram of the low-temperature economizer provided in the present invention and a conventional low-temperature economizer, wherein a is a dust flow field diagram of a conventional low-temperature economizer, B is a dust flow field diagram of an embodiment of the present invention, and C is a gas-phase flow field diagram of an embodiment of the present invention.
The reference numerals are explained below:
1, an upstream flue, 11 small equal-diameter sections, 12 gradually-expanding sections and 13 large equal-diameter sections;
2, a heat exchange device;
3 wear-proof device, 31 flow guide part, 311 flow guide plate, 312 flow guide hole plate, 313 turbulence plate, 32 flow rectification part and 33 wear-proof part.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution of the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the wear prevention device 3 includes a flow guide member 31, a flow straightening member 32, and a wear prevention member 33. The upstream flue 1 of the low-temperature economizer is provided with a small constant diameter section 11, a gradually expanding section 12 and a large constant diameter section 13 from upstream to downstream in sequence. It will be understood that upstream and downstream are relative to the direction of flow of the flue gas, with the position of the flue gas flowing first being upstream and the position of the flue gas flowing later being downstream.
The heat exchange means 2 is arranged in the large constant diameter section 13. The wear protection 3 is arranged upstream of the heat exchanger 2. The flow guide member 31 is disposed at the intersection of the small constant diameter section 11 and the divergent section 12, that is, the upstream portion of the flow guide member 31 is located in the small constant diameter section 11, and the downstream portion of the flow guide member 31 is located in the divergent section 12. The rectifying member 32 is disposed in the large constant diameter section 13, and is adjacent to the divergent section 12. The wear prevention member 33 is arranged in the large constant diameter section 13 between the heat exchanging device 2 and the rectifying member 32. By adopting the arrangement mode, the anti-abrasion effect of the anti-abrasion device 3 can be improved.
The number of the flow guide members 31 is plural, and eight flow guide members 31 are illustrated in fig. 1. The flow guide members 31 are arranged at intervals in order in the width direction of the upstream flue 1. The upstream flue 1 is generally a square pipe, and the width direction of the square pipe is parallel to the installation plane of the low-temperature economizer. In the figure, four flow guide members 31 are located on the upper side of the central axis a of the upstream flue 1, and four flow guide members 31 are located on the lower side of the central axis a of the upstream flue 1. Preferably, the flow guiding element 31 on the upper side of the central axis a is symmetrical to the flow guiding element 31 on the lower side of the central axis a about the central axis a, so that the smoke can be distributed more uniformly.
Specifically, as shown in fig. 2 and 3, the flow guide member 31 includes a flow guide plate 311, a flow guide hole plate 312, and a turbulence plate 313.
The flow guide plate 311 is parallel to the central axis a of the upstream flue 1. The drainage plate 311 is not provided with holes, so that the surface of the plate is smooth. The flow guide plates 311 of all the flow guide members 31 are parallel to each other, and adjacent flow guide plates 311 are spaced apart from each other. The flow guide plates 311 of all the flow guide parts 31 divide the whole flue of the low-temperature economizer into a plurality of small flow channels together, and guide the flue gas to enter different small flow channels in a dispersing manner.
The upstream end of the flow guide pore plate 312 is connected with the downstream end of the flow guide plate 311, and a plurality of through holes are uniformly formed in the flow guide pore plate 312. The flow guide hole plates 312 are inclined with respect to the flow guide plate 311 in a direction away from the central axis a, and in the illustrated angle, the flow guide hole plates 312 positioned on the upper side of the central axis a are inclined upward with respect to the flow guide plate 311, and the flow guide hole plates 312 positioned on the lower side of the central axis a are inclined downward with respect to the flow guide plate 311.
The included angle α 1 between the flow guide hole plate 312 and the flow guide plate 311 is an obtuse angle. The size of the included angle α 1 can be adjusted according to the inclination angle α of the side wall of the gradually expanding section 12 of the upstream flue 1, and the larger α is, the smaller α 1 is the included angle between the flow guide hole plate 312 and the flow guide plate 311.
Referring to fig. 4A, in a conventional low-temperature economizer with a flow guide device, when flue gas flows through a heat exchange device, gas phase flow is uniformly dispersed, but dust flow still moves in the original direction, and dust particle oblique jet flow is formed. Because the dust concentration of the dust particle oblique jet flow is high and the heat exchange tube is obliquely impacted at a certain angle, the two factors are superposed to cause the scouring abrasion of the dust particle oblique jet flow to the heat exchange tube to be very serious, thereby causing the phenomenon that the heat exchange tube is abraded more seriously due to the reverse fall of the additionally-installed flow guide device in part of low-temperature economizer engineering.
In the scheme, the flow guide hole plate 312 and the flow guide plate 311 are arranged, the gas-phase flow and the dust flow can be divided into two parts by combining the two parts, one part of the gas-phase flow and the dust flow extends to the divergent section 12 of the low-temperature economizer under the drainage action of the flow guide plate 311, and the other part of the gas-phase flow and the dust flow passes through the through hole of the flow guide hole plate 312 and continues to flow downstream, so that the gas-phase flow and the dust flow can be uniformly distributed when flowing through the heat exchange device 2, and oblique jet flow of dust particles can not occur, and therefore, the problem of abrasion of the heat exchange tube can be effectively solved.
Preferably, the included angle α 1 of each of the flow guiding components located on the same side of the central axis is different in size, specifically: the angle α 1 of the flow guide orifice plate 312 increases further away from the central axis a. In the view shown in the figure, the included angle α 1 of each guide hole plate 312 positioned on the upper side of the central axis a is larger, and the included angle α 1 of each guide hole plate 312 positioned on the lower side of the central axis a is larger. More preferably, the difference α 2 between the angles α 1 of the flow guiding pore plates 312 of the adjacent flow guiding parts 31 on the same side of the central axis a is not more than 8 °. By the design, a better anti-abrasion effect can be obtained.
Preferably, the aperture ratio range of the flow guide aperture plate 312 is: 20-50%, the aperture of the single hole is less than 30mm, and the design can give consideration to both the flow dividing performance of the flow guide hole plate 312 and the flow resistance of the flue gas.
The spacing D1 between adjacent flow guide plates 311 ranges from: 300 mm-1500 mm. The length L1 of the drainage plate 311 ranges from 100mm to 1000 mm. The length L2 of the flow directing orifice plate 312 ranges from: 300 mm-1500 mm.
Further, the flow guide member 31 may be provided with a turbulence plate 313. As shown in fig. 2, an upstream end of the turbulent plate 313 is connected to a downstream end of the flow guide orifice plate 312, and is inclined with respect to the flow guide orifice plate 312 in a direction away from the central axis a. In the illustrated aspect, the turbulence plate 313 located on the upper side of the central axis a is inclined upward with respect to the flow guide hole plate 312, and the turbulence plate 313 located on the lower side of the central axis a is inclined downward with respect to the flow guide hole plate 312.
The included angle α 3 between the turbulence plate 313 and the flow guide hole plate 312 is an obtuse angle. The range of the angle α 3 is preferably: 100 to 160 degrees.
As shown in fig. 3, turbulence plate 313 comprises a plurality of plates, each plate being sequentially spaced along the downstream end edge of the flow directing orifice plate 312. The plates of turbulence plate 313 may be rectangular, trapezoidal, triangular, etc., with the area of the individual plates controlled at 400mm2～1600mm2In the meantime.
When the flue gas and the dust flow through the turbulent flow plate 313, a small vortex region is formed at the downstream end of the turbulent flow plate 313, and the dust in the region can be scattered under the action of the vortex, so that the dust is prevented from being agglomerated, and the gas phase flow and the dust flow are further uniformly distributed.
The rectifying part 32 can adopt a grid structure constructed by transverse plates and vertical plates, the distance between every two adjacent transverse plates is not more than 150mm, the distance between every two adjacent vertical plates is not more than 150mm, and the lengths of the transverse plates and the vertical plates are not more than 400 mm. The rectifying component 32 can force the flow direction of the flue gas and the dust to be vertical to the cross section of the flue, so that the angle of the gas-solid two-phase flow scouring heat exchange tube at each position can be ensured to be basically consistent, the problem of serious local abrasion of the heat exchange tube can be relieved, and the service life of the heat exchange tube can be prolonged.
The distance between the wear-proof member 33 and the rectifying member 32 is not less than 200 mm. The wear-resistant part 33 can further prevent flue gas and dust from directly scouring the heat exchange tubes of the heat exchange device 2 at high speed, thereby further prolonging the service life of the heat exchange tubes.
The wear member 33 comprises a plurality of tube rows, each of which is arranged at intervals in sequence along the central axis a. Each group of tube rows comprises a plurality of anti-abrasion tubes, and the anti-abrasion tubes can be round tubes or oval tubes. Preferably, the pipe diameter (for an oval pipe, the pipe diameter refers to the short diameter) of the anti-abrasion pipe is the same as the pipe diameter of the heat exchange pipe of the heat exchange device 2, and the distance between every two adjacent anti-abrasion pipes is the same as the distance between every two adjacent heat exchange pipes of the heat exchange device 2, so that a better anti-abrasion effect can be achieved.
The following table is a table of dimensions for one specific embodiment of the present scheme.
In fig. 4, B is a dust flow field diagram of the embodiment, C is a gas flow field diagram of the embodiment, and a is a dust flow field diagram of a conventional low-temperature economizer, and the abrasion rate of the heat exchange tube is reduced by 59% as compared with the conventional low-temperature economizer. Therefore, by adopting the scheme, the problem of leakage caused by over-quick abrasion of the heat exchange tube can be effectively solved, so that the long-term stable and efficient operation of the low-temperature economizer can be effectively guaranteed.
The anti-wear device and the low-temperature economizer provided by the utility model are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The anti-abrasion device is arranged in an upstream flue of the low-temperature economizer, and is characterized in that the anti-abrasion device (3) comprises a plurality of flow guide parts (31), each flow guide part (31) comprises a flow guide plate (311) and a flow guide pore plate (312), the upstream end of each flow guide pore plate (312) is connected with the downstream end of each flow guide plate (311), and the flow guide plates (311) of the flow guide parts (31) are parallel to each other;
the flow guide components (31) are sequentially arranged at intervals in the width direction of the upstream flue, the flow guide plates (311) of the flow guide components (31) are parallel to the central axis (a) of the upstream flue, the flow guide pore plates (312) are inclined relative to the flow guide plates (311) in the direction far away from the central axis (a), and the included angle alpha 1 between the flow guide pore plates (312) and the flow guide plates (311) is an obtuse angle.
2. The wear protection device according to claim 1, wherein the flow guiding member (31) further comprises a turbulence plate (313), an upstream end of the turbulence plate (313) is connected to a downstream end of the flow guiding orifice plate (312), the turbulence plate (313) is inclined with respect to the flow guiding orifice plate (312) in a direction away from the central axis (a), an included angle α 3 between the turbulence plate (313) and the flow guiding orifice plate (312) is an obtuse angle, and the turbulence plate (313) comprises a plurality of plates, and the plates are sequentially spaced along the downstream end edge of the flow guiding orifice plate (312).
3. The wear protection device according to claim 2, wherein the included angle α 1 of the flow guiding elements (31) on the same side of the central axis (a) is different, in particular: the angle α 1 of the flow guide member (31) further from the central axis (a) is larger.
4. A wear arrangement according to claim 3, wherein the difference α 2 between the angles α 1 of adjacent flow guide elements (31) on the same side of the central axis (a) is not more than 8 °.
5. The wear protection device of claim 4, wherein the range of aperture ratio of the flow directing orifice plate (312) is: 20% -50%, the aperture of a single hole is less than 30mm, and the area range of a single plate of the turbulence plate (313) is as follows: 400mm2～1600mm2。
6. The wear protection device according to any of claims 1-5, characterized in that the wear protection device (3) further comprises a flow straightening member (32), the flow straightening member (32) being of a grid structure, the flow straightening member (32) being arranged downstream of the flow guiding member (31).
7. The wear protection device according to claim 6, characterized in that the wear protection device (3) further comprises a wear protection member (33), the wear protection member (33) being arranged downstream of the fairing member (32), the wear protection member (33) comprising a plurality of tube rows, each tube row being arranged at intervals in sequence along the central axis (a), each tube row comprising a plurality of wear protection tubes.
8. The wear protection device of claim 7, wherein the distance between the wear member (33) and the fairing member (32) is not less than 200 mm.
9. The wear prevention device according to claim 7, wherein the wear prevention pipe is a circular pipe or an elliptical pipe, the diameter of the circular pipe or the minor diameter of the elliptical pipe is the same as the diameter of a heat exchange pipe of the heat exchange device (2) of the low-temperature economizer, and the distance between two adjacent wear prevention pipes is the same as the distance between two adjacent heat exchange pipes of the heat exchange device (2).
10. A low-temperature coal economizer comprising an upstream flue (1) and a heat exchange device (2), and characterized by further comprising an anti-wear device, wherein the anti-wear device (3) is the one in any one of claims 6 to 9; upstream flue (1) is equipped with little constant diameter section (11), divergent section (12) and big constant diameter section (13) from upper reaches to low reaches in proper order, heat transfer device (2) are arranged in big constant diameter section (13), water conservancy diversion part (31) are arranged divergent section (12) with the boundary position of little constant diameter section (11), rectifying component (32) are arranged in big constant diameter section (13) and adjacent divergent section (12), wear proof device (3) still include wear proof parts (33), wear proof parts (33) are arranged in big constant diameter section (13) and be located rectifying component (32) with between heat transfer device (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120939129.4U CN215929531U (en) | 2021-04-30 | 2021-04-30 | Anti-abrasion device and low-temperature economizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120939129.4U CN215929531U (en) | 2021-04-30 | 2021-04-30 | Anti-abrasion device and low-temperature economizer |
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| CN215929531U true CN215929531U (en) | 2022-03-01 |
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| CN202120939129.4U Active CN215929531U (en) | 2021-04-30 | 2021-04-30 | Anti-abrasion device and low-temperature economizer |
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