CN213555865U - Regional large granule ash intercepting device of SCR denitration and system - Google Patents
Regional large granule ash intercepting device of SCR denitration and system Download PDFInfo
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- CN213555865U CN213555865U CN202021677823.5U CN202021677823U CN213555865U CN 213555865 U CN213555865 U CN 213555865U CN 202021677823 U CN202021677823 U CN 202021677823U CN 213555865 U CN213555865 U CN 213555865U
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Abstract
The utility model belongs to the technical field of the flue gas purification technique and specifically relates to a regional large granule ash intercepting device of SCR denitration and system are related to. The intercepting device comprises a first intercepting net, a second intercepting net and a supporting and separating frame; the first interception net and the second interception net are correspondingly arranged on two opposite sides of the supporting and separating frame, the included angle between the plane of the first interception net and the vertical direction is a, and the included angle between the plane of the second interception net and the vertical direction is b; wherein a is 10-30 degrees and b is 30-45 degrees. The utility model discloses well first interception net slope sets up, and with the increase of large granule ash area of contact, interception efficiency is higher, and the part large granule ash that passes through first interception net along with the flue gas collides with the interception net once more in second interception net department, because second interception net is first interception net inclination relatively bigger, and large granule ash is bigger with interception net collision probability. The utility model discloses an intercepting device has not only improved the interception effect of large granule ash, has reduced the impact force to the interception net moreover.
Description
Technical Field
The utility model belongs to the technical field of the flue gas purification technique and specifically relates to a regional large granule ash intercepting device of SCR denitration and system are related to.
Background
The SCR denitration technology refers to reducing agent (such as NH) within the range of 280-420 DEG C3Urea and ammonia etc.) under the action of catalyst and NO in flue gasxReacting to produce pollution-free N2And H2NO of OxAnd (3) emission reduction technology.
To meet the increasingly stringent NO requirements in the prior artxEmission standard, coal fired power plant has generally installed SCR flue gas denitrification facility, however, the SCR device that adopts almost all is "high temperature high dust" type, and does not have the flue gas bypass. The SCR flue gas denitration device is arranged between an economizer (the economizer is arranged below a flue at the tail part of a boiler and used for recovering waste heat) and an air preheater, and researches show that with the increase of the operation time, a catalyst layer generates a serious fly ash blocking phenomenon during the operation of part of the SCR flue gas denitration device, and the blocking area even reaches more than 30 percent. The method not only greatly reduces the performance of the denitration device, but also improves the flue gas speed in catalyst holes in an unblocked area, and deteriorates erosion and abrasion of the catalyst. The root of the serious ash blockage of the catalyst is that large particle ash such as slag, caking and the like enters the SCR reactor along with flue gas to block catalyst pore channels, and the accumulation of fly ash in a blocked area gradually increases. The existence of large granule ash not only leads to blocking regional catalyst not participating in denitration reaction, has still accelerated the wearing and tearing of unblocking regional catalyst, has reduced the denitrification facility performance by a wide margin, can lead to the host computer even not to countAnd (5) stopping the machine.
In the prior art, an SCR denitration device of a coal-fired power plant is usually provided with an ash bucket at an outlet of an economizer or an outlet of a vertical flue to collect fly ash, and although a conventional ash bucket can intercept large particle ash into a catalyst channel, the interception efficiency still needs to be further improved.
Therefore, it is an urgent need to solve the above problems by developing a novel device and system for intercepting large particle ash in SCR denitration region.
SUMMERY OF THE UTILITY MODEL
The first purpose of the utility model is to provide a large particle ash intercepting device in the SCR denitration area, which can improve the large particle ash intercepting effect;
a second object of the utility model is to provide a regional large granule ash interception system of SCR denitration, aim at solving and pile up the problem that causes the SCR denitration performance to descend because of the large granule ash.
The utility model provides a large particle ash intercepting device in an SCR denitration area, which comprises a first intercepting net, a second intercepting net and a supporting and separating frame;
the first interception net and the second interception net are correspondingly arranged on two opposite sides of the supporting and separating frame, the included angle between the plane of the first interception net and the vertical direction is a, and the included angle between the plane of the second interception net and the vertical direction is b;
wherein a is 10-30 degrees and b is 30-45 degrees.
Further, first interception net with the second interception net all includes the frame and fixes the setting and is in filter screen on the frame.
Furthermore, a plurality of frame bodies are arranged in the frame, and a reinforcing rib is arranged between each frame body;
the filter screen is fixedly arranged on each frame body.
Furthermore, the filtering holes of the filter screen are rectangular, the long sides of the filtering holes are 15-30mm, and the short sides of the filtering holes are 8-15 mm.
Furthermore, the supporting and separating frame consists of a frame and a plurality of supporting columns which are sequentially and fixedly arranged on the frame in parallel;
the diameter of the support columns is 30-80mm, and the distance between every two adjacent support columns is 100-150 mm.
The utility model also discloses an interception system for large particle ash in the SCR denitration area, which comprises the interception device;
the intercepting device is arranged at an inlet of a horizontal flue of the SCR denitration area, and one side of the supporting and separating frame, which is provided with a second intercepting net, is fixedly connected with the bottom wall of the inlet end of the horizontal flue;
the first interception net and the second interception net are abutted against the inner wall of the horizontal flue except for the edge connected with the supporting and separating frame.
Further, the device also comprises a flow guide device and an economizer ash hopper;
the flow guide device is arranged at the corner of the vertical flue at the tail part of the boiler and the horizontal flue;
the coal economizer ash hopper is arranged at the bottom of the vertical flue, and the support separation frame is communicated with the coal economizer ash hopper.
Furthermore, the flow guide device consists of two flow guide plates with an included angle of 45-60 degrees, and the two flow guide plates and the side wall of the vertical flue form a right-angled triangle structure;
one sides of the first intercepting net and the second intercepting net, which are far away from the support separation frame, are respectively abutted against the guide plate which is used as a right-angle side of the right-angled triangle.
Furthermore, one side of the first interception net far away from the support separation frame is abutted to the joint of the two guide plates.
Furthermore, a wear-resistant ceramic layer is laid on the surface of the guide plate serving as the hypotenuse of the right triangle;
and a nano ceramic composite layer is laid on the surface of the filter screen.
The utility model discloses a regional large granule ash intercepting device of SCR denitration, compared with the prior art, have following advantage:
1. the utility model discloses an intercepting device includes first interception net, second interception net and support separation frame, wherein, the slope of first interception net sets up, first interception net and the increase of large granule ash area of contact, therefore its interception efficiency is higher, the part large granule ash that passes through first interception net along with the flue gas is in second interception net department once more with the collision of interception net, because second interception net inclination is bigger relatively first interception net, consequently, large granule ash is bigger with second interception net collision probability, make large granule ash interception efficiency higher. The interception device of the utility model not only obviously improves the interception effect of large particle ash, but also reduces the impact force of the flue gas vertically acting on the interception net, and prolongs the service life of the interception net; the intercepting device has simple structure, convenient installation and low operation and maintenance cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a large particle ash intercepting device in an SCR denitration area of the present invention;
FIG. 2 is a cross-sectional view of the intercepting apparatus of the present invention;
fig. 3 is a schematic view of a first intercepting net and a second intercepting net of the present invention;
FIG. 4 is a schematic view of the large particle ash intercepting system of the SCR denitration area of the present invention;
figure 5 is the utility model discloses regional large granule ash interception system in SCR denitration user state sketch map.
Description of reference numerals:
1: a first interception net; 2: a second interception net; 3: a support separation frame; 4: a frame; 5: filtering with a screen; 6: reinforcing ribs; 7: a frame; 8: a support pillar; 9: a horizontal flue; 10: an economizer hopper; 11: a baffle; 12: a catalyst layer; 13: and (4) a vertical flue.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-5, the large granular ash intercepting device for the SCR denitration region provided by the present invention comprises a first intercepting screen 1, a second intercepting screen 2 and a supporting and separating frame 3; the first interception net 1 and the second interception net 2 are correspondingly arranged on two opposite sides of the supporting and separating frame 3, an included angle between a plane where the first interception net 1 is located and the vertical direction is a, and an included angle between a plane where the second interception net 2 is located and the vertical direction is b; wherein a is 10-30 degrees and b is 30-45 degrees.
In the prior art, a large particle ash intercepting device in a flue is often vertically arranged in the flue, such as a ridge type, a flat plate type and a wave type, a single-layer intercepting screen is mainly used, if a single-layer intercepting screen needs to be provided with a smaller aperture for realizing larger intercepting efficiency, the smaller aperture can cause the increase of the probability of large particle ash blocking the aperture, and thus the non-uniformity of a flow field in the flue is caused; in addition, the flue gas impacts the vertical barrier greatly, which can result in greatly reduced barrier life, reduced reliability and increased cost. In order to solve the problem, the utility model provides a regional large granule ash intercepting device of SCR denitration includes first interception net 1, second interception net 2 and supports separator 3, and first interception net 1 and second interception net 2 correspond the setting and support the both sides that separator 3 is relative, and the flue gas passes through first interception net 1 and second interception net 2 in proper order during the use. In order to solve the problem of impact of smoke on the intercepting net, an included angle between the first intercepting net 1 and the vertical direction is a, an included angle between the second intercepting net 2 and the vertical direction is b, wherein a is 10-30 degrees, and b is 30-45 degrees, namely, the smoke firstly collides with the first intercepting net 1, as the first intercepting net 1 is obliquely arranged, the contact area between a filter hole and large particle ash is increased, the intercepting efficiency is higher, the smoke collides with the intercepting net again at the second intercepting net 2 through part of the large particle ash of the first intercepting net 1, and as the second intercepting net 2 has a larger inclination angle relative to the first intercepting net 1, the collision probability of the large particle ash and the second intercepting net 2 is higher, and the large particle ash intercepting efficiency is higher. Therefore, the intercepting net with two levels of non-parallel inclined arrangement can realize high-efficiency collision interception of large particle ash, not only increases the capture probability of the large particle ash and improves the intercepting effect of the large particle ash, but also greatly reduces the impact force vertically acting on the intercepting net and improves the service life of the intercepting net. In this embodiment a is 20 ° and b is 35 °.
Further, the first intercepting net 1 and the second intercepting net 2 both comprise a frame 4 and a filter screen 5 fixedly arranged on the frame 4.
The first interception net 1 and the second interception net 2 both comprise a frame 4 and a filter screen 5 fixedly arranged on the frame 4, and the frame 4 is made of wear-resistant steel materials, such as high-chromium cast iron, high-manganese steel, low-alloy wear-resistant steel, martensitic stainless steel and the like. The filter screen 5 is made of stainless steel material, and the filter screen 5 is connected with the frame 4 in a welding mode.
Furthermore, a plurality of frame bodies are arranged in the frame 4, and a reinforcing rib 6 is arranged between each frame body; the filter screen 5 is fixedly arranged on each frame body.
In order to improve the impact resistance of the filter screen 5, a plurality of frame bodies are arranged in the frame 4, each frame body is connected through a reinforcing rib 6, and the filter screen 5 is fixedly arranged on each frame body.
Furthermore, the filtering holes of the filtering net 5 are rectangular, the long sides of the filtering holes are 15-30mm, and the short sides of the filtering holes are 8-15 mm.
In order to reduce the probability of blocking the filter holes of the interception net by large particle ash and reduce the pressure drop loss in the flue, the filter holes of the filter screen 5 are designed in a rectangular shape, the long sides of the filter holes are 15-30mm, the short sides of the filter holes are 8-15mm, and the sizes of the first interception net 1 and the second interception net 2 are enlarged or reduced in an equal proportion according to the sectional area and the arrangement angle of the flue where the first interception net 1 and the second interception net 2 are arranged. In this embodiment, the long side of the filter hole is 20mm, and the short side is 10 mm.
Further, the supporting and separating frame 3 is composed of a frame 7 and a plurality of supporting columns 8 which are sequentially and parallelly fixedly arranged on the frame 7; the diameter of the support columns 8 is 30-80mm, and the distance between adjacent support columns 8 is 100-150 mm.
The large granular ash intercepted by the first intercepting net 1 and the second intercepting net 2 is collected through the supporting and separating frame 3 under the action of gravity, the supporting and separating frame 3 is composed of a frame 7 and a plurality of supporting columns 8 sequentially arranged on the frame 7 in parallel, the supporting columns 8 are stainless steel columns with the diameter of 30-80mm, the length of each stainless steel column is set to be 400-800mm according to the width of a flue, and the distance between every two adjacent supporting columns 8 is 100-150mm, so that the distance between the bottom supporting columns 8 is large, and the large granular ash intercepted and fallen cannot be blocked. In this embodiment, the support columns 8 have a diameter of 50mm and a length of 600mm, and the distance between adjacent support columns 8 is 120 mm.
The utility model also discloses an interception system for large particle ash in the SCR denitration area, which comprises the interception device; the intercepting device is arranged at an inlet of a horizontal flue 9 of the SCR denitration area, and one side of the supporting and separating frame 3, which is provided with the second intercepting screen 2, is fixedly connected with the bottom wall of the inlet end of the horizontal flue 9; the first interception net 1 and the second interception net 2 are abutted against the inner wall of the horizontal flue 9 except for the edge connected with the supporting and separating frame 3. In this embodiment, the abutting connection may be welding or clamping.
In regional large granule ash intercepting system of SCR denitration, including foretell intercepting device to intercepting device sets up at the entrance of regional horizontal flue 9 of SCR denitration, supports one side fixed connection that separator 3 was provided with second interception net 2 on the diapire of horizontal flue 9 entry end, and first interception net 1 and second interception net 2 all offset with the inner wall of horizontal flue 9 except the edge that is connected with support separator 3. The large granule ash bumps with first interception net 1 at the horizontal flue 9 import department at first promptly, carries out the interception of first large granule ash, bumps with the interception net again in second interception net 2 department along with the partial large granule ash of flue gas through first interception net 1, and the interception net that the two-stage slope set up has increased the surface area and the through flow area of interception net, has not only shown the interception efficiency that has improved the large granule ash, greatly reduced the impact force of vertical action on the interception net moreover.
Further, the device also comprises a flow guide device and an economizer ash hopper 10; the flow guide device is arranged at the corner of the vertical flue 13 at the tail part of the boiler and the horizontal flue 9; the economizer ash hopper 10 is arranged at the bottom of the vertical flue 13, and the support separation frame 3 is communicated with the economizer ash hopper 10.
The utility model discloses an among the regional large granule ash interception system of SCR denitration, still include guiding device and economizer ash bucket 10, wherein, guiding device sets up in the corner of the vertical flue 13 of boiler afterbody and horizontal flue 9, and economizer ash bucket 10 sets up the bottom at vertical flue 13. The flue gas containing large particle ash flows out from the coal economizer outlet at a certain speed, and in the downward flowing process, firstly, the flue gas passes through the flow guide device, part of the flue gas is reduced in speed under the collision action of the flow guide device and flows to the direction of the coal economizer ash bucket 10, at the moment, part of the large particle ash in the flue gas is also reduced in speed after colliding with the flow guide plate 11, and the reduced large particle ash enters the coal economizer ash bucket 10 under the actions of inertia and gravity. The other part of the large particle ash continuously flows downstream along with the flue gas, collides with the intercepting device at the inlet of the horizontal flue 9 to intercept the large particle ash, and the intercepted large particle ash slides down to the ash hopper 10 of the coal economizer along the intercepting net or the supporting and separating frame 3. The ash in the ash hopper 10 of the coal economizer is treated by an ash cleaning device at regular time, and the flue gas treated by the blocking device enters a subsequent system after the reaction of the flue gas by the catalyst layer 12.
Further, the flow guide device is composed of two flow guide plates 11 with an included angle of 45-60 degrees, and the two flow guide plates 11 and the side wall of the vertical flue 13 are in a right-angled triangle structure; one sides of the first intercepting net 1 and the second intercepting net 2, which are far away from the support separation frame 3, are respectively abutted against the guide plate 11 which is used as a right-angle side of a right-angled triangle.
The flow guiding device in the utility model is composed of two flow guiding plates 11 with an included angle of 45-60 degrees, and forms a right triangle structure with the side wall of the vertical flue 13. For realizing good water conservancy diversion effect to prevent the enrichment of large granule ash, one side that support separator 3 was kept away from to first interception net 1 and second interception net 2 all offsets with guide plate 11 as right-angle triangle right-angle side. In this embodiment, the abutting connection may be welding or clamping. Therefore, the large particle ash after colliding and decelerating with the guide plate 11 enters the economizer ash bucket 10 under the action of inertia and gravity, and the large particle ash intercepted by the first intercepting net 1 further slides into the economizer ash bucket 10 along the intercepting net. Furthermore, the guide plate 11 is a steel plate with the thickness of 5-10mm, the length of the guide plate 11 serving as the right-angle side of the right-angled triangle is 500-1500mm, and the specific length is calculated and set according to the size of the actual boiler flue. In this embodiment, the angle between the two baffles 11 is 50 °, and the thickness of the baffle 11 is 10 mm.
Further, one side of the first intercepting net 1, which is far away from the supporting and separating frame 3, is abutted against the joint of the two guide plates 11.
In order to further increase the collision contact area of the large particle ash and the first interception net 1, one side of the first interception net 1, which is far away from the support separation frame 3, is abutted against the connection part of the two guide plates 11. In this embodiment, the abutting connection may be welding or clamping.
Furthermore, the surface of the guide plate 11 which is taken as the hypotenuse of the right triangle is laid with wear-resistant ceramic material; the surface of the filter screen 5 is coated with a nano ceramic composite material.
In order to prolong the service life of the guide plate 11 and the interception net, the surface of the guide plate 11 which is taken as the hypotenuse of the right triangle is coated with the wear-resistant ceramic material, and the surface of the filter screen 5 is coated with the nano ceramic composite material.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; 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 or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The large particle ash intercepting device in the SCR denitration area is characterized by comprising a first intercepting net (1), a second intercepting net (2) and a supporting and separating frame (3);
the first interception net (1) and the second interception net (2) are correspondingly arranged on two opposite sides of the supporting and separating frame (3), an included angle between a plane where the first interception net (1) is located and the vertical direction is a, and an included angle between a plane where the second interception net (2) is located and the vertical direction is b;
wherein a is 10-30 degrees and b is 30-45 degrees.
2. The intercepting apparatus according to claim 1, characterized in that said first intercepting screen (1) and said second intercepting screen (2) each comprise a frame (4) and a sieve (5) fixedly arranged on said frame (4); and a nano ceramic composite layer is laid on the surface of the filter screen (5).
3. The intercepting apparatus according to claim 2, wherein a plurality of frames are provided in the frame (4), and a reinforcing rib (6) is provided between each frame;
the filter screen (5) is fixedly arranged on each frame body.
4. The intercepting apparatus according to any of claims 2 or 3, wherein the filtering holes of the filtering net (5) are rectangular, and the long sides of the filtering holes are 15-30mm and the short sides are 8-15 mm.
5. The intercepting device according to claim 4, wherein said supporting and separating frame (3) is composed of a frame (7) and a plurality of supporting columns (8) which are sequentially and parallelly fixed on said frame (7);
the diameter of the supporting columns (8) is 30-80mm, and the distance between every two adjacent supporting columns (8) is 100-150 mm.
6. An interception system for large particle ash in an SCR denitration area, which is characterized by comprising the interception device of any one of claims 1 to 5;
the intercepting device is arranged at an inlet of a horizontal flue (9) of the SCR denitration area, and one side of the supporting and separating frame (3) provided with the second intercepting net (2) is fixedly connected with the bottom wall of the inlet end of the horizontal flue (9);
the first interception net (1) and the second interception net (2) are abutted against the inner wall of the horizontal flue (9) except for the edge connected with the supporting and separating frame (3).
7. The interception system according to claim 6, further comprising a deflector and an economizer hopper (10);
the flow guide device is arranged at the corner of a vertical flue (13) at the tail of the boiler and the horizontal flue (9);
the economizer ash hopper (10) is arranged at the bottom of the vertical flue (13), and the support separation frame (3) is communicated with the economizer ash hopper (10).
8. The intercepting system according to claim 7, wherein the flow guiding device is composed of two flow guiding plates (11) with an included angle of 45-60 degrees, and the two flow guiding plates (11) and the side wall of the vertical flue (13) are in a right-angled triangle structure;
one sides, far away from the support separation frame (3), of the first interception net (1) and the second interception net (2) are respectively abutted to the guide plate (11) serving as a right-angle side of a right-angled triangle.
9. The interception system according to claim 8, characterized in that the side of said first interception net (1) far from said supporting and separating frame (3) is against the junction of two said deflectors (11).
10. The interception system according to claim 9, characterized in that the surface of said deflector (11) that is the hypotenuse of the right triangle is coated with a wear-resistant ceramic layer.
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| CN202021677823.5U CN213555865U (en) | 2020-08-13 | 2020-08-13 | Regional large granule ash intercepting device of SCR denitration and system |
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| CN202021677823.5U CN213555865U (en) | 2020-08-13 | 2020-08-13 | Regional large granule ash intercepting device of SCR denitration and system |
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