CN117606015A - Wall-attached air structure of front and rear wall opposite-flow combustion boiler - Google Patents
Wall-attached air structure of front and rear wall opposite-flow combustion boiler Download PDFInfo
- Publication number
- CN117606015A CN117606015A CN202311562196.9A CN202311562196A CN117606015A CN 117606015 A CN117606015 A CN 117606015A CN 202311562196 A CN202311562196 A CN 202311562196A CN 117606015 A CN117606015 A CN 117606015A
- Authority
- CN
- China
- Prior art keywords
- wall
- wind
- reducing atmosphere
- layer
- adherence
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 27
- 238000010304 firing Methods 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 239000007921 spray Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 15
- 239000002184 metal Substances 0.000 abstract description 15
- 238000005260 corrosion Methods 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 description 8
- 239000003245 coal Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 230000001464 adherent effect Effects 0.000 description 5
- 239000002817 coal dust Substances 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 4
- 230000001502 supplementing effect Effects 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
- F23C5/28—Disposition of burners to obtain flames in opposing directions, e.g. impacting flames
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The present disclosure relates to an adherence wind structure of a front and rear wall opposed firing boiler for solving the technical problem that the adherence wind system on the furnace wall has limited effect of alleviating metal high temperature corrosion. The wall-attached wind structure of the front and rear wall opposite-flow combustion boiler is arranged on the front and rear wall opposite-flow combustion boiler, the front and rear wall opposite-flow combustion boiler comprises a furnace wall and a plurality of burners, the furnace wall comprises a front wall and a rear wall which are oppositely arranged, and two side walls which are oppositely arranged, and the front wall, the rear wall and the two side walls enclose a hearth. The burners are positioned in the hearth and are oppositely arranged on the front wall and the rear wall, and the oppositely arranged burners can be used for opposed combustion so as to form a reducing atmosphere on the wall surface of the side wall, wherein the reducing atmosphere comprises a low-concentration reducing atmosphere and a high-concentration reducing atmosphere. The wall-attached air structure of the front-back wall opposite-flow combustion boiler comprises a plurality of wall-attached air nozzles arranged on the side walls, and the number of the wall-attached air nozzles in the low-concentration reducing atmosphere range is smaller than that of the wall-attached air nozzles in the high-concentration reducing atmosphere range.
Description
Technical Field
The present disclosure relates to the technical field of boiler equipment, and in particular, to an adherence wind structure of a front and rear wall opposed firing boiler.
Background
The boiler forms heat radiation through the combustion of the burner in the hearth, and utilizes the heat radiation to heat water into steam for the steam turbine to do work and generate electricity. When the coal powder is burnt in the hearth through the burner, a reducing atmosphere is easy to generate, and the reducing atmosphere contains a large amount of carbon monoxide CO and hydrogen sulfide H 2 S-type gas is liable to cause high-temperature corrosion of metals when the reducing atmosphere contacts with metal parts such as water wall tubes, superheaters, reheaters and the like in the boiler. In the prior art, although the influence of metal high-temperature corrosion is relieved by arranging an adherence air system on a furnace wall, the effect of the prior adherence air system on relieving the metal high-temperature corrosion is limited from the aspect of actual operation, and the problem that a large area of metal is corroded still exists.
Disclosure of Invention
The purpose of the present disclosure is to provide an adherence wind structure of a front and back wall opposed firing boiler, and aims to solve the technical problem that the adherence wind system on the furnace wall has limited effect of alleviating metal high temperature corrosion.
In order to achieve the above object, the present disclosure provides an adherent wind structure of a front and rear wall opposed firing boiler, installed on the front and rear wall opposed firing boiler, the front and rear wall opposed firing boiler includes:
the furnace wall comprises a front wall, a rear wall and two side walls, wherein the front wall and the rear wall are oppositely arranged, and the two side walls are oppositely arranged; the method comprises the steps of,
the burners are positioned in the hearth and are oppositely arranged on the front wall and the rear wall, the oppositely arranged burners can be used for opposite combustion to form a reducing atmosphere on the wall surface of the side wall, the reducing atmosphere comprises a low-concentration reducing atmosphere and a high-concentration reducing atmosphere, and the concentration of the low-concentration reducing atmosphere is smaller than that of the high-concentration reducing atmosphere;
the wall-attached wind structure of the front-rear wall opposed firing boiler comprises a plurality of wall-attached wind nozzles arranged on the side walls, and the number of the wall-attached wind nozzles in the low-concentration reducing atmosphere range is smaller than that of the wall-attached wind nozzles in the high-concentration reducing atmosphere range.
In some embodiments, the plurality of attachment wind jets are layered along the side wall from low to high;
the number of the wall-attached wind nozzles in each layer in the low-concentration reducing atmosphere range is smaller than that in each layer in the high-concentration reducing atmosphere range.
In some embodiments, the hierarchically arranged plurality of wall-mounted wind jets comprises: the first layer of adherence wind nozzles, the second layer of adherence wind nozzles, the third layer of adherence wind nozzles and the fourth layer of adherence wind nozzles are sequentially arranged along the direction from low side wall to high side wall;
the first layer of adherence wind nozzles and the second layer of adherence wind nozzles are positioned in the low-concentration reducing atmosphere range, and each layer is provided with two adherence wind nozzles; the third layer of adherence wind spouts and the fourth layer of adherence wind spouts are positioned in the high-concentration reducing atmosphere range, and each layer is provided with four adherence wind spouts.
In some embodiments, the front and rear wall opposed firing boiler further comprises a plurality of water wall tubes disposed within the furnace and helically mounted to the furnace wall;
the wall-attached air nozzles penetrate through the space between the adjacent water wall pipes, are long-strip-shaped, and are obliquely arranged along the spiral direction of the water wall pipes.
In some embodiments, the wall-mount wind jets comprise a first sub-jet and a second sub-jet;
along the direction of water wall pipe slope, first sub-spout with the crisscross setting of second sub-spout, just first sub-spout with the second sub-spout is central symmetry setting, a plurality of water wall pipe wears to locate first sub-spout with between the second sub-spout.
In some embodiments, along the height direction of the side wall, the distance between the centers of adjacent wall-attached wind spouts is 4.5m-5.5m;
and the distance between the centers of adjacent wall-attached wind spouts is 2.5m-3.5m along the horizontal direction.
In some embodiments, the front wall and the rear wall are provided with a plurality of layers of wall-attached air nozzles along the height direction, and the wall-attached air nozzles are arranged at positions close to the side walls;
the spray direction of the adherence wind spray nozzle is provided with a declination angle, and the declination angle of the adherence wind spray nozzle in the low concentration reducing atmosphere range is different from the declination angle of the adherence wind spray nozzle in the high concentration reducing atmosphere range.
In some embodiments, the downtilt angle of the adherence wind nozzle in the low concentration reducing atmosphere range is smaller than the downtilt angle of the adherence wind nozzle in the high concentration reducing atmosphere range.
In some embodiments, a first layer of adherence wind nozzles, a second layer of adherence wind nozzles and a third layer of adherence wind nozzles are sequentially arranged along the front wall and the rear wall from low to high;
the first layer of adherence air nozzles are positioned in the low-concentration reducing atmosphere range, and the declination angle of the first layer of adherence air nozzles is 5 degrees; the second-layer adherence air nozzle and the third-layer adherence air nozzle are positioned in the high-concentration reducing atmosphere range, and the declination angle of the second-layer adherence air nozzle and the third-layer adherence air nozzle is 15 degrees.
In some embodiments, the front and rear wall opposed firing boiler further comprises a hot primary air system and a hot secondary air system;
the wall-attached air nozzle is led from the hot primary air system, and the wall-attached air nozzle is led from the hot secondary air system.
Compared with the prior art, the beneficial effects that this disclosure had are:
according to the method, the plurality of adherence air nozzles are arranged on the side wall of the furnace wall, air can be supplemented into the hearth through the adherence air nozzles, so that coal dust can be fully combusted by supplementing oxygen, and carbon monoxide CO and hydrogen sulfide H are reduced 2 The S-type gas content reduces the reducing atmosphere. Meanwhile, the wall-attached air nozzles with smaller quantity are arranged in a low-concentration reducing atmosphere range with relatively lower concentration, and wall-attached air nozzles with larger quantity are arranged in a high-concentration reducing atmosphere range with relatively higher concentration, so that air supplement in a hearth is more targeted. Thus, not only ensuring the full combustion of the pulverized coal in the high-concentration reducing atmosphere range, but also ensuringThe coal powder is fully combusted in the low-concentration reducing atmosphere range, so that the reducing atmosphere in the region with higher concentration is reduced, the reducing atmosphere in the region with lower concentration is reduced, and the problem of large-area high-temperature corrosion of metal parts such as water wall tubes in a hearth is solved.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a schematic cross-sectional view of a boiler in an adherent wind structure of a front and rear wall opposed firing boiler provided by an exemplary embodiment of the present disclosure;
FIG. 2 is a schematic cross-sectional view of the front and rear wall opposed firing boiler of FIG. 1 at A-A;
FIG. 3 is a schematic view of an arrangement of wall-mounted wind jets of the wall-mounted wind structure of the front and rear wall-opposed firing boiler of FIG. 1;
FIG. 4 is a schematic cross-sectional view of a front and rear wall opposed firing boiler mounted spiral waterwall tubes provided in an exemplary embodiment of the present disclosure;
FIG. 5 is a schematic view of the structure of an attached wind jet between adjacent waterwall tubes of FIG. 4;
FIG. 6 is a schematic view of an arrangement of wall-mounted wind nozzles on a front wall of the wall-mounted wind structure of the front-rear wall-opposed firing boiler of FIG. 1;
FIG. 7 is a schematic cross-sectional view of the downtilt angle of the wall-mounted wind nozzle of FIG. 6.
Description of the reference numerals
01-front and rear wall opposed firing boilers; 10-furnace wall; 11-front wall; 110-an adherence wind nozzle; 111-a first layer of wall-mounted wind nozzles; 112-a second layer of attachment wind nozzles; 113-a third layer of adhesive air nozzles; 12-a rear wall; 13-side walls; 130-adherence wind spout; 130 A-A first sub-spout; 130 b-a second sub-spout; 131-a first layer of adherence wind spouts; 132-second layer of wall-mounted wind jets; 133-third layer of adherence wind spout; 134-fourth layer of wall-attached wind nozzles; 14-hearth; a 20-burner; 30-reducing atmosphere; 31-a low concentration reducing atmosphere; 32-a high concentration reducing atmosphere; 40-water wall tube; 51-a hot primary air system; 52-a hot overgrate air system.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
In the description of the present disclosure, it should be understood that the terms "upper," "lower," and the like indicate an orientation or a positional relationship defined based on the drawing direction of the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, and a specific orientation configuration and operation, and thus should not be construed as limiting the present disclosure, and furthermore, the terms "inner and outer" refer to the inside and outside of the corresponding structural profile. In addition, the terms "first," "second," etc. are merely intended to distinguish one element from another element, and are not sequential or important.
In the description of the present disclosure, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "mounted" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art as the case may be.
The present disclosure provides an adherence wind structure of a front and rear wall-opposed firing boiler, which may be installed on a front and rear wall-opposed firing boiler 01, as shown in fig. 1 and 2, and the front and rear wall-opposed firing boiler 01 may include a furnace wall 10 and a plurality of burners 20. The furnace wall 10 may include a front wall 11 and a rear wall 12 disposed opposite to each other, and two side walls 13 disposed opposite to each other, and the front wall 11, the rear wall 12, and the two side walls 13 may enclose a furnace 14. A plurality of burners 20 may be positioned within the firebox 14 and disposed opposite the front wall 11 and the rear wall 12, the oppositely disposed burners 20 being capable of counter-combustion to form a reducing atmosphere 30 at the wall surface of the side wall 13. The reducing atmosphere 30 may include a low concentration reducing atmosphere 31 and a high concentration reducing atmosphere 32, and the concentration of the low concentration reducing atmosphere 31 may be smaller than the concentration of the high concentration reducing atmosphere 32. The wall-attached wind structure of the front and rear wall-opposed firing boiler may include a plurality of wall-attached wind spouts 130 provided on the side wall 13, the number of wall-attached wind spouts 130 in the range of the low concentration reducing atmosphere 31 being smaller than the number of wall-attached wind spouts 130 in the range of the high concentration reducing atmosphere 32.
The concentration of the reducing atmosphere 31 in the present disclosure is not limited to a specific value of the concentration of the reducing atmosphere 30, compared to the concentration of the reducing atmosphere 32 in the high concentration. The number of the adherent wind nozzles 130 in the range of the low-concentration reducing atmosphere 31 and the high-concentration reducing atmosphere 32 can be adjusted in time according to different conditions of pulverized coal combustion in the hearth 14. The present disclosure is not particularly limited to the specific concentration of the reducing atmosphere 30.
The front and rear wall opposed firing boiler 01 means a firing pattern (shown by hollow arrows in fig. 1) in which a plurality of burners 20 can be arranged relatively on the same axis of the front wall 11 and the rear wall 12, and fuel (pulverized coal) and hot air can be respectively expanded after being injected into the furnace 14 (shown by dotted lines in fig. 2), and a rising flame can be formed after the center of the front wall 11 and the rear wall 12 is struck. In some embodiments, the burner 20 may be further configured to rotate to spray fuel (pulverized coal) and hot air so that the fuel and hot air sprayed from the front wall 11 and the rear wall 12 may be more sufficiently mixed and burned. Wherein the direction of rotation of adjacent burners 20 can be reversed to increase the swirl strength of the burners 20 to optimize combustion conditions within the furnace 14. Of course, the multi-layered burner 20 may be further provided on the front wall 11 and the rear wall 12. The number of layers of the burner 20 provided on the furnace wall 10 is not particularly limited in the present disclosure.
Based on this, the combustion area in the furnace 14 can be divided into a main combustion area, a reduction area and a burnout area from bottom to top (direction shown by coordinates in the figure) according to the difference of the combustion degree of the fuel in the furnace 14. The main combustion zone is located downstream of the flame, i.e., near and below the lowest burner 20, and the gases outside the flame are often present in an oxidizing or weakly reducing atmosphere. The reduction zone is located above the main combustion zone, i.e., above the vicinity of the lowest burner 20, and the gas outside the flame is mostly represented as a reducing atmosphere 30. And feeding secondary hot air above the reduction zone to enable the fuel to be completely combusted, wherein the zone is a burnout zone. Wherein the reduction zone may have a reducing corrosion effect on the metal under the combined action of the high temperature and the reducing atmosphere 30. In the actual combustion process, the concentration of the reducing atmosphere 30 at the top of the reduction zone is generally greater than that of the reducing atmosphere 30 at the bottom of the reduction zone, and the reducing atmosphere 30 is mostly accumulated in the side wall 13 regions at both sides of the combustion flame, so that the metal parts on the side wall 13 are easily corroded over a large area.
The utility model discloses a plurality of adherence wind spouts 130 are arranged on the side wall 13 of the furnace wall 10, hot air can be supplemented into the hearth 14 through the adherence wind spouts 130, so that coal dust can be fully combusted by supplementing oxygen, and carbon monoxide CO and hydrogen sulfide H are reduced 2 The content of the S-type gas is reduced by the reducing atmosphere 30. Meanwhile, the present disclosure further sets a smaller number of wall-attached wind nozzles 130 in the range of the low-concentration reducing atmosphere 31 with a relatively lower concentration, and sets a larger number of wall-attached wind nozzles 130 in the range of the high-concentration reducing atmosphere 32 with a relatively higher concentration, so that the air supply in the furnace 14 is more targeted. Thus, the coal dust can be fully combusted in the high-concentration reducing atmosphere 32 and the coal dust can be fully combusted in the low-concentration reducing atmosphere 31, so that the low-concentration reducing atmosphere 31 and the high-concentration reducing atmosphere 32 are reduced, and the condition that metal parts in the hearth 14 are corroded in a large area is improved.
The range of the reducing atmosphere 30 refers to the projection range of the reducing atmosphere 30 of the flame outside gas on the side wall 13 (the reducing atmosphere 30 accumulated on the side wall 13 is larger than the reducing atmospheres 30 accumulated on the front wall 11 and the rear wall 12). The positions and the numbers of the wall-attached wind nozzles 130 arranged on the side wall 13 of the present disclosure are targeted according to the concentration differences of the reducing atmosphere 30. Not only reduces the content of the reducing atmosphere 30, but also avoids the problems of complex preparation process, difficult maintenance, damaged combustion energy in the hearth 14 and the integral structure of the furnace wall 10, loss of wind supplementing energy and the like caused by a large number of openings on the furnace wall 10. In other words, under the condition that the furnace wall 10 has the same number of openings, the effect of the present disclosure on reducing the reducing atmosphere 30 is more obvious by setting different positions and numbers of the adherence wind spouts 130 in combination with the concentration of the reducing atmosphere 30.
Specifically, as shown in fig. 3, a plurality of the attachment wind spouts 130 may be layered in a direction from low to high (from bottom to top in the drawing) along the side wall 13. The number of the attaching wind spouts 130 per layer in the range of the low concentration reducing atmosphere 31 is smaller than the number of the attaching wind spouts 130 per layer in the range of the high concentration reducing atmosphere 32. Because the concentration of the reducing atmosphere 30 at the top of the reducing zone is generally greater than that of the reducing atmosphere 30 at the bottom of the reducing zone, the wall-attached air nozzles 130 on the side wall 13 are layered, so that the plurality of wall-attached air nozzles 130 can pointedly cover the whole range of the reducing atmosphere 30, and the mixing degree of the air supplement sprayed by the wall-attached air nozzles 130 and the reducing atmosphere 30 is improved. In addition, the wall-attached air nozzles 130 arranged in a layered manner are beneficial to keeping the regularity of the opening structure of the furnace wall 10, avoiding messy openings on the furnace wall 10 and reducing the difficulty of opening the furnace wall 10.
Thus, a small number of the wall-attached wind spouts 130 can be arranged for each layer in the low-concentration reducing atmosphere 31 having a low concentration. For a low-concentration high-concentration reducing atmosphere 32, a greater number of adherent wind jets 130 may be provided per layer. Of course, the position of the attachment wind spouts 130 may be set according to the concentration of the reducing atmosphere 30 measured in the furnace 14. For example, the plurality of the attachment wind spouts 130 may be arranged in a circular arrangement, a radial arrangement, or the like on the side wall 13 according to the arrangement position of the burner 20 in the furnace 14, the range of the reducing atmosphere 30, and the concentration of the reducing atmosphere 30 at different positions. The present disclosure does not particularly limit the arrangement of the attachment wind spouts 130 on the side wall 13.
In some embodiments, as shown in fig. 3, the plurality of coanda wind jets 130 in a layered arrangement may include: the first layer of adherence wind spout 131, the second layer of adherence wind spout 132, the third layer of adherence wind spout 133 and the fourth layer of adherence wind spout 134 are arranged in sequence along the direction from low to high of the side wall 13. The first layer of adherence wind spouts 131 and the second layer of adherence wind spouts 132 may be located within the range of the low concentration reducing atmosphere 31, and each layer may be provided with two adherence wind spouts 130. The third layer of adherence wind spouts 133 and the fourth layer of adherence wind spouts 134 may be located within the range of the high concentration reducing atmosphere 32, and each layer may be provided with four adherence wind spouts 130.
The reducing atmosphere 30 with different concentrations is matched by setting different numbers of the adherence wind spouts 130 on each layer, so that the adherence wind spouts 130 can be arranged with fewer numbers in the range of the low-concentration reducing atmosphere 31 with low concentration and with more numbers in the range of the high-concentration reducing atmosphere 32 with high concentration. Therefore, the plurality of adherence wind nozzles 130 not only can cover the whole range of the reducing atmosphere 30 in a layered arrangement mode, but also can adapt to different concentrations of the reducing atmosphere 30 in a mode of setting different numbers on each layer, thereby reducing the reducing atmosphere 30 in the hearth 14 in a large area and avoiding the corrosion of metals in a large area. Of course, each layer of the attachment wind jets 130 may be provided in five, six or more numbers depending on the size of the range of the reducing atmosphere 30. In addition, the number of adjacent layer-attached wind jets 130 may be the same or different within the same concentration of the reducing atmosphere 30. The present disclosure is not particularly limited to a specific number of each layer of the attachment wind jets 130.
On this basis, as shown in fig. 4, the front-rear wall opposed firing boiler 01 may further include a plurality of water wall tubes 40, and the plurality of water wall tubes 40 may be disposed in the furnace 14 and spirally mounted on the furnace wall 10. The wall-attached wind spouts 130 may penetrate between adjacent water wall tubes 40, and the wall-attached wind spouts 130 are elongated in shape and are inclined along the spiral direction of the water wall tubes 40. In this way, the helically-mounted waterwall tubes 40 cause the water within the tubes to rise rotationally, so that more time to heat can be received within the firebox 14 to heat the water within the waterwall tubes 40 to steam. At this time, the wall-attached wind nozzle 130 may be inclined in a long strip shape along the spiral direction of the water wall pipe 40, so as to increase the wind supplementing area of the wall-attached wind nozzle 130, and make the side wall 13 have sufficient air to fully burn with the pulverized coal. In addition, when the wall-attached air nozzles 130 are arranged between the water wall pipes 40, the water wall pipes 40 need to be bent along the periphery of the wall-attached air nozzles 130, and the strip-shaped wall-attached air nozzles 130 can reduce the bending workload of the water wall pipes 40, so that the difficulty of boiler manufacturing is reduced. When installed, rectangular ductwork may be welded to the attachment wind jets 130. Of course, the attachment wind spout 130 may be provided in a circular opening shape, and the opening shape of the attachment wind spout 130 is not particularly limited in the present disclosure.
Specifically, as shown in fig. 5, the coanda wind jets 130 can include a first sub-jet 130a and a second sub-jet 130b. Along the inclined direction of the water wall pipes 40, the first sub-nozzles 130a and the second sub-nozzles 130b may be staggered, and the first sub-nozzles 130a and the second sub-nozzles 130b may be arranged in a central symmetry manner, and the plurality of water wall pipes 40 may be arranged between the first sub-nozzles 130a and the second sub-nozzles 130b in a penetrating manner. The wall-attached air nozzle 130 is arranged in a structure form that the first sub-nozzle 130a and the second sub-nozzle 130b are staggered, so that the coverage area of the wall-attached air nozzle 130 can be increased in the length direction of the strip shape. The plurality of water wall pipes 40 can be arranged between the first sub-nozzle 130a and the second sub-nozzle 130b in a penetrating manner, so that the first sub-nozzle 130a and the second sub-nozzle 130b can be separated by a certain distance, on one hand, the coverage area of the wall-attached air nozzle 130 can be increased in the width direction of the strip shape, and on the other hand, the problem that only a single water wall pipe 40 is arranged between the first sub-nozzle 130a and the second sub-nozzle 130b in a penetrating manner, and the water wall pipe 40 is low in strength and easy to break can be avoided.
With the above embodiment, as shown in fig. 3, the spacing between the centers of adjacent attachment wind spouts 130 may be set to 4.5m-5.5m along the height direction of the side wall 13. The interval between the centers of the adjacent attachment wind spouts 130 may be set to 2.5m-3.5m in the horizontal direction. The center of the adjacent wall-attached wind jets 130 may be the center of the center symmetry between the first sub-jets 130a and the second sub-jets 130b in the above embodiment. In this way, the distance between the adjacent wall-attached wind nozzles 130 on the side wall 13 is larger, so that the number of the wall-attached wind nozzles 130 arranged on the side wall 13 is reduced, and the preparation difficulty of the boiler is reduced.
The above embodiment is described in detail with respect to the arrangement positions and the number of the attachment wind spouts 130 on the side wall 13. In order to reduce the reducing atmosphere 30 in the furnace 14, as shown in fig. 2, wall-attached air nozzles 110 may be provided on the front wall 11 and the rear wall 12. The following embodiments will describe the concrete structure of the wall-attached air nozzle 110 in detail using the front wall 11 as an example, and the wall-attached air nozzle 110 provided on the rear wall 12 may be the same as the wall-attached air nozzle 110 provided on the front wall 11. As shown in fig. 6, the front wall 11 and the rear wall 12 may be installed with a plurality of layers of the wall-attached wind nozzles 110 in a height direction (a direction from bottom to top in the drawing), and the wall-attached wind nozzles 110 may be disposed at positions close to the side walls 13. The injection direction of the adherence wind nozzle 110 has a declination angle, and the declination angle of the adherence wind nozzle 110 in the range of the low concentration reducing atmosphere 31 may be different from the declination angle of the adherence wind nozzle 110 in the range of the high concentration reducing atmosphere 32.
The wall-attached air nozzle 110 is arranged at a position close to the side wall 13, so that the supplementary hot air sprayed by the wall-attached air nozzle 110 can diffuse towards the middle part of the side wall 13, and the supplementary hot air sprayed by the wall-attached air nozzle 110 can be mixed with the supplementary air sprayed by the wall-attached air nozzle 130, thereby promoting the full combustion of coal dust and reducing carbon monoxide CO and hydrogen sulfide H 2 And (3) generating S-type gas. Meanwhile, the wall-attached air nozzle 110 has a downward inclination angle, so that the rising resistance of the supplementary air sprayed by the wall-attached air nozzle 130 along with the flow of the smoke can be increased, the diffusion of the air flow to the outer wall is reduced, and the generation of the reducing atmosphere 30 is weakened from the source. And the downward sprayed supplementary air can also extend along the depth direction of the hearth 14, so that the coverage range of the supplementary air on the side wall 13 is increased.
For example, as shown in fig. 7, the declination angle of the coanda wind nozzle 110 in the range of the low concentration reducing atmosphere 31 may be smaller than the declination angle of the coanda wind nozzle 110 in the range of the high concentration reducing atmosphere 32. In this way, because the position of the high concentration reducing atmosphere 32 is higher than that of the low concentration reducing atmosphere 31, the air supply ejected from the wall-attached air nozzle 110 with a larger downward inclination angle within the range of the high concentration reducing atmosphere 32 can be deeper into the hearth 14 than the air supply ejected from the wall-attached air nozzle 110 with a smaller downward inclination angle within the range of the low concentration reducing atmosphere 31, thereby improving the coverage of the wall-attached air flow along the depth direction of the hearth 14 and reducing the reducing atmosphere 30 in the middle region of the side wall 13. The concentration of the low concentration reducing atmosphere 31 is small and the position is low, so the wall-attached air nozzle 110 in the range of the low concentration reducing atmosphere 31 can be set to a small declination angle.
Specifically, as shown in fig. 7, a first layer of attachment wind nozzles 111, a second layer of attachment wind nozzles 112, and a third layer of attachment wind nozzles 113 are provided in this order in the direction from low to high of the front wall 11 and the rear wall 12. The first layer adherence wind nozzle 111 is located within the range of the low concentration reducing atmosphere 31, and the declination angle of the first layer adherence wind nozzle 111 is 5 °. The second-layer adherence wind nozzle 112 and the third-layer adherence wind nozzle 113 are located in the range of the high-concentration reducing atmosphere 32, and the declination angle of the second-layer adherence wind nozzle 112 and the third-layer adherence wind nozzle 113 is 15 °.
When the downward inclination angle of the first-layer adherence wind nozzle 111 is excessively small, the supplementary wind ejected from the first-layer adherence wind nozzle 111 may not penetrate into the low-concentration reducing atmosphere 31 at the bottom of the reduction zone, thereby causing insufficient decrement of the low-concentration reducing atmosphere 31. When the declination angle of the first layer of the attachment wind nozzle 111 is too large, the air supply sprayed by the first layer of the attachment wind nozzle 111 may exceed the bottom of the reduction zone, resulting in loss of air supply. When the downtilt angles of the second-layer adherence-wind nozzle 112 and the third-layer adherence-wind nozzle 113 are too small, the coverage of the adherence-wind flow is small, and the reducing atmosphere 30 still exists in a partial area. When the declination angle of the second-layer adherence wind nozzle 112 and the third-layer adherence wind nozzle 113 is too large, the supplementary wind sprayed from the second-layer adherence wind nozzle 112 and the third-layer adherence wind nozzle 113 may not completely cover the range of the reducing atmosphere 30 of the side wall 13, so that the reducing atmosphere 30 may exist in the middle area of the side wall 13.
In addition, depending on the size of the front and rear wall opposed firing boiler 01, the front wall 11 and the rear wall 12 may be provided with a greater number of layers of the adherent wind nozzles 110. The number of layers of the coanda wind nozzles 110 provided on the front wall 11 and the rear wall 12 is not particularly limited in the present disclosure. In some embodiments, the height of the coanda wind nozzles 110 provided on the front wall 11 and the rear wall 12 may be higher than the height of the coanda wind nozzles 130 provided on the side wall 13. Thus, the supplementary air ejected from the wall-attached air nozzle 110 can be sufficiently mixed with the supplementary air ejected from the wall-attached air nozzle 130 while covering the side wall 13 over a large area.
In the above embodiment, as shown in fig. 1, the front and rear wall opposed firing boiler 01 may further include a hot primary air system 51 and a hot secondary air system 52. The attachment wind nozzles 110 may be directed to the hot primary wind system 51 and the attachment wind jets 130 may be directed to the hot secondary wind system 52. In actual practice, hot primary air system 51 may be the hot air system required to provide combustion by burner 20 and hot secondary air system 52 may be the hot air system required to provide combustion in the burnout zone. Typically, the wind power of the hot primary wind system 51 is greater than the wind power of the hot secondary wind system 52. The wall-attached air nozzle 110 is led to the hot primary air system 51, and the wall-attached air nozzle 130 is led to the hot secondary air system 52, so that the energy of combustion in the hearth 14 can be prevented from being influenced by the direct entering of the flame of the wall-attached air nozzle 130. Meanwhile, the supplementary air sprayed from the close-to-wall air nozzle 110 can be extended to the middle position of the side wall 13 as much as possible.
The air volume of the wall-attached air nozzle 110 can be controlled by the pneumatic adjusting device and the manual adjusting device on the main pipeline led out by the hot primary air system 51, and the air volume of the wall-attached air nozzle 110 can be independently adjusted by the manual adjusting baffle on each wall-attached air nozzle 110. Similarly, the air volume of the wall-attached air nozzle 130 can be controlled by the pneumatic adjusting device and the manual adjusting device on the main pipeline led out by the hot overgrate air system 52, and the air volume of the wall-attached air nozzle 130 can be independently adjusted by the manual adjusting baffle on each wall-attached air nozzle 130.
In summary, according to the wall-attached air structure of the front-rear wall opposed firing boiler provided by the present disclosure, through the specific design of the positions and the number of the wall-attached air nozzles 110 and the wall-attached air nozzles 130, the middle position of the side wall 13 can be timely supplemented with air, so that the large-area corrosion of the metal components such as the water wall tube 40 caused by the accumulation of the reducing atmosphere 30 on the middle wall surface of the side wall 13 is avoided. The reformed front and rear wall opposite firing boiler 01 runs stably, and cannot cause negative influence on boiler output, main running parameters and the like. In addition, the hydrodynamic characteristics of the front and rear wall opposite-flow combustion boiler 01 are not destroyed, and the problems of pipe wall super-temperature and pipe explosion caused by metal corrosion of metal parts such as the water wall pipe 40 are greatly avoided.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (10)
1. The utility model provides an adherence wind structure of front and back wall opposite firing boiler, its characterized in that installs on the front and back wall opposite firing boiler, front and back wall opposite firing boiler includes:
the furnace wall comprises a front wall, a rear wall and two side walls, wherein the front wall and the rear wall are oppositely arranged, and the two side walls are oppositely arranged; the method comprises the steps of,
the burners are positioned in the hearth and are oppositely arranged on the front wall and the rear wall, the oppositely arranged burners can be used for opposite combustion to form a reducing atmosphere on the wall surface of the side wall, the reducing atmosphere comprises a low-concentration reducing atmosphere and a high-concentration reducing atmosphere, and the concentration of the low-concentration reducing atmosphere is smaller than that of the high-concentration reducing atmosphere;
the wall-attached wind structure of the front-rear wall opposed firing boiler comprises a plurality of wall-attached wind nozzles arranged on the side walls, and the number of the wall-attached wind nozzles in the low-concentration reducing atmosphere range is smaller than that of the wall-attached wind nozzles in the high-concentration reducing atmosphere range.
2. The wall-attached wind structure of a front-rear wall opposed firing boiler according to claim 1, wherein the plurality of wall-attached wind spouts are arranged in layers along the direction from low to high of the side wall;
the number of the wall-attached wind nozzles in each layer in the low-concentration reducing atmosphere range is smaller than that in each layer in the high-concentration reducing atmosphere range.
3. The wall-mounted wind structure of a front-rear wall opposed firing boiler according to claim 2, wherein the plurality of wall-mounted wind spouts arranged in layers comprises: the first layer of adherence wind nozzles, the second layer of adherence wind nozzles, the third layer of adherence wind nozzles and the fourth layer of adherence wind nozzles are sequentially arranged along the direction from low side wall to high side wall;
the first layer of adherence wind nozzles and the second layer of adherence wind nozzles are positioned in the low-concentration reducing atmosphere range, and each layer is provided with two adherence wind nozzles; the third layer of adherence wind spouts and the fourth layer of adherence wind spouts are positioned in the high-concentration reducing atmosphere range, and each layer is provided with four adherence wind spouts.
4. The wall-mounted wind structure of a front and rear wall-opposed firing boiler according to claim 1, further comprising a plurality of water wall tubes disposed in the furnace and spirally mounted on the furnace wall;
the wall-attached air nozzles penetrate through the space between the adjacent water wall pipes, are long-strip-shaped, and are obliquely arranged along the spiral direction of the water wall pipes.
5. The wall-mounted wind structure of a front and rear wall-opposed firing boiler according to claim 4, wherein the wall-mounted wind spouts include a first sub-spout and a second sub-spout;
along the direction of water wall pipe slope, first sub-spout with the crisscross setting of second sub-spout, just first sub-spout with the second sub-spout is central symmetry setting, a plurality of water wall pipe wears to locate first sub-spout with between the second sub-spout.
6. The wall-attached wind structure of a front and rear wall opposed firing boiler according to claim 5, wherein a distance between centers of adjacent wall-attached wind spouts is 4.5m to 5.5m in a height direction of the side wall;
and the distance between the centers of adjacent wall-attached wind spouts is 2.5m-3.5m along the horizontal direction.
7. The wall-attached wind structure of a front and rear wall opposed firing boiler according to any one of claims 1 to 6, wherein the front wall and the rear wall are installed with a plurality of layers of wall-attached wind nozzles in a height direction, the wall-attached wind nozzles being disposed at positions close to the side walls;
the spray direction of the adherence wind spray nozzle is provided with a declination angle, and the declination angle of the adherence wind spray nozzle in the low concentration reducing atmosphere range is different from the declination angle of the adherence wind spray nozzle in the high concentration reducing atmosphere range.
8. The wall-attached wind structure of a front-rear wall opposed firing boiler according to claim 7, wherein a downtilt angle of the wall-attached wind nozzle in the low concentration reducing atmosphere range is smaller than a downtilt angle of the wall-attached wind nozzle in the high concentration reducing atmosphere range.
9. The wall-attached wind structure of a front and rear wall opposed firing boiler according to claim 8, wherein a first layer of wall-attached wind nozzles, a second layer of wall-attached wind nozzles, and a third layer of wall-attached wind nozzles are provided in this order in a direction from low to high along the front wall and the rear wall;
the first layer of adherence air nozzles are positioned in the low-concentration reducing atmosphere range, and the declination angle of the first layer of adherence air nozzles is 5 degrees; the second-layer adherence air nozzle and the third-layer adherence air nozzle are positioned in the high-concentration reducing atmosphere range, and the declination angle of the second-layer adherence air nozzle and the third-layer adherence air nozzle is 15 degrees.
10. The wall-mounted wind structure of a front and rear wall-opposed firing boiler according to claim 7, wherein the front and rear wall-opposed firing boiler further comprises a hot primary wind system and a hot secondary wind system;
the wall-attached air nozzle is led from the hot primary air system, and the wall-attached air nozzle is led from the hot secondary air system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311562196.9A CN117606015A (en) | 2023-11-21 | 2023-11-21 | Wall-attached air structure of front and rear wall opposite-flow combustion boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311562196.9A CN117606015A (en) | 2023-11-21 | 2023-11-21 | Wall-attached air structure of front and rear wall opposite-flow combustion boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117606015A true CN117606015A (en) | 2024-02-27 |
Family
ID=89954186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311562196.9A Pending CN117606015A (en) | 2023-11-21 | 2023-11-21 | Wall-attached air structure of front and rear wall opposite-flow combustion boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117606015A (en) |
-
2023
- 2023-11-21 CN CN202311562196.9A patent/CN117606015A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102230623B (en) | Flat combustion device | |
| EA019175B1 (en) | Horizontal thick and thin direct-current pulverized coal burner arranged by wall type | |
| CN109539253A (en) | A kind of ultralow nitrogen gas burner | |
| CN216346263U (en) | Novel marsh gas low-nitrogen burner | |
| CN215411868U (en) | Cyclone flue gas recirculation gas burner | |
| CN112377894B (en) | Pulverized coal combustion boiler with air-cut circle | |
| CN114183771A (en) | Pulverized coal fired boiler ignition oil gun | |
| CN221403021U (en) | Wall-attached air structure of front and rear wall opposite-flow combustion boiler | |
| CN106439801B (en) | A kind of reverse spray type bluff body vortex burner | |
| CN117606015A (en) | Wall-attached air structure of front and rear wall opposite-flow combustion boiler | |
| CN209445357U (en) | A kind of ultralow nitrogen gas burner | |
| CN115013973B (en) | Full premix water-cooling gas boiler | |
| KR100764903B1 (en) | Construction of a furnace of a pulverized coal boiler for power station | |
| CN202132950U (en) | Flat combustion device | |
| CN214147857U (en) | Wind tangent circle pulverized coal combustion boiler | |
| CN113883517B (en) | Natural air inlet type low-nitrogen combustor | |
| CN115875663A (en) | Thermal power generation boiler with mixed combustion of ammonia and coal | |
| CN112963832B (en) | Full-premix low NOx burner with explosion-proof function | |
| CN109578991B (en) | Accurate air distribution system of pulverized coal boiler | |
| CN111076170A (en) | Low-nitrogen gas burner and working method | |
| CN107575869B (en) | Energy-saving low NOx combustor suitable for biomass biogas | |
| CN216408946U (en) | High momentum straight flow type coal powder burner | |
| CN217402533U (en) | Stable combustion structure of four-corner tangential combustion boiler | |
| CN215336318U (en) | Low-pollution burner head structure | |
| CN112628732B (en) | Nozzle adjustable low NO suitable for middle-low heat value gasxBurner with a burner head |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |