CN213237491U - Coal-fired boiler structure - Google Patents
Coal-fired boiler structure Download PDFInfo
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- CN213237491U CN213237491U CN202021660368.8U CN202021660368U CN213237491U CN 213237491 U CN213237491 U CN 213237491U CN 202021660368 U CN202021660368 U CN 202021660368U CN 213237491 U CN213237491 U CN 213237491U
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Abstract
The utility model discloses a coal-fired boiler structure, which comprises a combustion structure, wherein the combustion structure comprises water-cooled walls arranged around the inner wall of a boiler furnace, a boiler furnace and a horizontal flue positioned at the upper part of the boiler furnace; the coal-fired boiler structure also comprises an air inlet structure, wherein the air inlet structure comprises an adherence air inlet which is positioned at the lower side of the boiler hearth and close to the position of the ash cooling hopper, and an over-fire air inlet is arranged at the center of the top of one end of the water-cooled wall, which is far away from the adherence air inlet; the water-cooled wall is divided into a first side and a second side, the tail part of the first side is provided with a cold ash bucket, and the second side is connected with a horizontal flue; the adherence air inlet is arranged at the position, close to the ash cooling hopper, of the first side; the air inlet mode of the wall-attached air inlet is tangential air inlet along the side wall of the boiler hearth; the utility model provides a structural style of this kind increase adherence wall wind, change over fire air spout position can further improve combustion efficiency, reduce boiler slagging phenomenon, prevent water-cooling wall oxidation corrosion.
Description
Technical Field
The utility model relates to a boiler parts machining reforms transform technical field, especially a coal fired boiler structure.
Background
The traditional coal-fired boiler causes residual rotation due to air flow speed deviation, so that the distribution of a flue gas flow field and a temperature field is not uniform, and the phenomenon of larger flue gas temperature deviation can occur. Meanwhile, in the combustion process of the traditional coal-fired boiler, the air flow deflects to cause the flame to stick to the wall, so that the phenomena of slag bonding and unstable combustion are caused. The slagging problem of the coal-fired boiler has great influence on the economical efficiency and the safety of the operation of the boiler, and is a traditional problem which needs to be solved for a long time. The problem of slagging of the coal-fired boiler is difficult to solve because the slagging process is accompanied by complicated processes such as flowing, heat transfer, combustion, chemistry and the like, so that research on the slagging process is necessary to a certain extent, in particular to the slagging problem of the coal-fired boiler of a large power station.
SUMMERY OF THE UTILITY MODEL
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract of the specification and the title of the application to avoid obscuring the purpose of this section, the abstract of the specification and the title of the application, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above and/or slag bonding problems that exist in existing coal fired boiler structures.
Therefore, one of the objects of the present invention is to provide a coal-fired boiler structure, which further improves the combustion efficiency of the boiler, reduces the slag formation of the boiler, and reduces the oxidation corrosion of the surface of the water-cooling wall.
In order to solve the technical problem, the utility model provides a following technical scheme: a coal-fired boiler structure comprises a combustion structure, a water-cooled wall, a boiler hearth and a horizontal flue, wherein the water-cooled wall and the boiler hearth are positioned on the periphery of the boiler hearth; the air inlet structure comprises an adherent air inlet positioned near the bottom of a boiler furnace, and an over-fire air inlet is arranged at the center of the top of one end far away from the adherent air inlet.
As a preferred scheme of the coal fired boiler structure of the present invention, wherein: the water-cooled wall is divided into a first side and a second side, a cold ash bucket is arranged at the tail of the first side, and the second side is connected with a horizontal flue.
As a preferred scheme of the coal fired boiler structure of the present invention, wherein: the adherence wind inlet is arranged at a position, close to the cold ash bucket, of the first side.
As a preferred scheme of the coal fired boiler structure of the present invention, wherein: the adherence wind entry has two, and sets up on same water flat line.
As a preferred scheme of the coal fired boiler structure of the present invention, wherein: the air inlet mode of the wall-attached air inlet is tangential air inlet along the side wall of the boiler hearth.
As a preferred scheme of the coal fired boiler structure of the present invention, wherein: the over-fire air inlet is arranged at the center of the top of the second side of the water-cooled wall and is opposite to the center of the boiler furnace.
As a preferred scheme of the coal fired boiler structure of the present invention, wherein: the joint of the water-cooled wall and the horizontal flue is inwards sunken to form a groove-shaped flame folding angle.
As a preferred scheme of the coal fired boiler structure of the present invention, wherein: and a water cooling tank is arranged on the side wall of the water cooling wall, and a water inlet and a water outlet are arranged at the head end and the tail end of the water cooling tank.
As a preferred scheme of the coal fired boiler structure of the present invention, wherein: the cold ash bucket is triangular.
As a preferred scheme of the coal fired boiler structure of the present invention, wherein: the horizontal flue is vertically connected with the water wall, and a platen superheater is arranged at the joint of the horizontal flue and the water wall.
The utility model has the advantages that: the utility model provides a structural style of this kind increase adherence wall wind, change over fire air spout position can further improve combustion efficiency, reduce boiler slagging phenomenon, prevent water-cooling wall oxidation corrosion.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor. Wherein:
FIG. 1 is a three-dimensional view of a coal-fired boiler structure.
FIG. 2 is a front sectional view of a coal fired boiler structure.
FIG. 3 is a cross-sectional view of a coal-fired boiler structure.
FIG. 4 is a diagram of the double vortex effect of the coal-fired boiler based on the vortex cold wall idea.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying the present invention are described in detail below with reference to the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, the references herein to "one embodiment" or "an embodiment" refer to a particular feature, structure, or characteristic that may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1-2, this embodiment provides a coal fired boiler structure, through designing specific air intake position, produces one kind and can improve boiler combustion efficiency, reduces the boiler slagging scorification, reduces the effect of water-cooling wall surface oxidation corrosion.
A coal-fired boiler structure comprises a combustion structure 100, wherein the combustion structure 100 comprises a water-cooled wall 101 arranged on the inner wall surface of the periphery of a boiler furnace, a boiler furnace 102 and a horizontal flue 103 positioned on the boiler furnace 102, the water-cooled wall 101 is preferably a light tube type water-cooled wall, the boiler furnace 102 is used for combustion of fuel, the used fuel is pulverized coal, and the horizontal flue 103 on the boiler furnace 102 is arranged at the top of the boiler furnace to facilitate discharge of flue gas; the utility model provides a coal fired boiler structure still includes air inlet structure 200, including being located boiler furnace 102 downside and being close to adherent wind entry 201 near cold ash bucket 104, adherent wind entry 201 figure can be set as a plurality ofly, adherent wind entry 201's the form that sets up has the multiple, can adopt perpendicular single import, form such as perpendicular double entry and the two imports of slope, boiler furnace 102 keeps away from one end top central point of adherent wind entry 201 and puts and be equipped with over fire air entry 202, over fire air entry 202 runs through water-cooling wall 101, its shape is preferably hollow cylindric, its position is located upper portion center department, just to boiler furnace 102 central point.
When using a coal fired boiler structure, at first burning pulverized coal fuel, then let in adherence wind entry 201 to boiler furnace 102 adherence wind, let in the air of burning out to air of burning out entry 202 again, under the effect of wind force, the combustion process in boiler furnace 102 can be more abundant, and combustion efficiency is higher to less burning is remaining, reduces the condition of boiler slagging scorification.
This embodiment is through designing a coal fired boiler structure, through letting in wall-attached wind, the air of having burnt out to in boiler furnace 102 has improved the combustion efficiency of fuel in boiler furnace 102, has realized reducing the boiler slagging scorification, improves coal fired boiler's combustion efficiency.
Example 2
Referring to fig. 1 to 4, the difference between the present embodiment and the above embodiments is that the present embodiment adds a structure such as a cold ash bucket 104, and designs specific positions of an adherence air inlet 201 and an over-fire air inlet 202, when fuel is combusted in a boiler furnace 102, strong vortex flow is formed inside the furnace when adherence air and over-fire air are introduced, and the rotating adherence air reversely flows to the top of the furnace under the action of a pressure difference at the bottom of the furnace, turns downward and mixes with pulverized coal, and then flows in the direction of the cold ash bucket, so as to form a double vortex structure, thereby improving the combustion efficiency of the fuel in the boiler furnace 102, and achieving the effect of reducing boiler slagging.
In the 90 s of the 20 th century, orbital technologies injected oxygen tangentially into the engine combustion chamber to increase the rate of solid fuel transfer, and found that a double vortex structure formed in the combustion chamber confined the hot gases to the core region, while the cold gases served as a barrier between the hot gases and the wall, and the cooler propellant near the wall not only insulated the heat transfer but also reduced the oxidation of the wall material by the hot gases.
Based on the above principle, the utility model makes further design to a coal fired boiler structure that designs. The water-cooled wall 101 is divided into a first side 101a and a second side 101b, a cold ash hopper 104 is arranged at the tail of the first side 101a, the second side 101b is connected with a horizontal flue 103, the cold ash hopper 104 is preferably triangular, a groove is formed in the cold ash hopper 104 to accommodate combustion residues conveniently, the horizontal flue 103 is vertically connected with a boiler hearth 102, and a platen superheater 103a is arranged at the connection position of the horizontal flue 103 and the boiler hearth; the adherent air inlets 201 are arranged at the position, close to the cold ash hopper 104, of the first side 101a, the number of the adherent air inlets 201 is preferably two, the adherent air inlets 201 are arranged on the same horizontal line, the air inlet mode of the adherent air inlets 201 is tangential air inlet along the side wall of the boiler hearth 102, namely, the air inlet mode of vertical double inlets is adopted, and the air inlet mode is shown in fig. 3; the overfire air inlet 202 is arranged at the center of the top of the boiler furnace 102, and the overfire air inlet 202 is opposite to the center of the boiler furnace 102; the joint of the water-cooled wall 101 and the horizontal flue 103 is inwards sunken to form a flame folding angle 105 which is triangular; the side wall of the water cooling wall 101 is provided with a water cooling groove 101c, the head end and the tail end of the water cooling groove 101c are provided with a water inlet 101d and a water outlet 101e, water is continuously fed into the water cooling groove 101c, the water fed into the water cooling groove 101 is heated by heat absorbed by the water cooling wall 101, and generated steam is fed into the steam turbine to enable the steam turbine to operate.
Wall-attached air is blown into the wall-attached air inlet 201, the wall-attached air is tangentially fed into the boiler furnace 102 along the side wall surface of the boiler furnace 102, strong vortex flow is formed inside the boiler furnace 102, and the rotating wall-attached air reversely flows to the top of the boiler furnace 102 under the action of the pressure difference at the bottom of the boiler furnace 102, turns downwards, is mixed with pulverized coal and then flows towards the direction of a cold ash hopper to form a double vortex structure. Three high areas of high coal powder concentration, high pressure and high temperature are formed in the inner vortex area of the double vortex, and the coal powder in the three high areas is subjected to violent combustion reaction. At this time, the overfire air is introduced into the overfire air inlet 202 at the central position of the top of the boiler furnace 102, and the overfire air enters the boiler furnace in a form of direct current jet flow along the axis, so that the mixing degree of pulverized coal airflow can be increased, the deflection resistance of the pulverized coal airflow is improved, namely the rigidity of the pulverized coal airflow is improved, and high-temperature flue gas around is further entrained, so that the combustion of the inner vortex region is more violent. The external vortex formed by the wall attaching wind plays a role in preventing the air flow from deflecting to cause flame to attach to the wall to cause boiler slagging and preventing the water cooling wall from oxidation corrosion.
This embodiment has increased cold ash bucket 104 isotructure through this embodiment to the concrete position of adherence wind entry 201 and overfire air entry 202 designs, has realized that the double vortex structure has been produced to boiler furnace 102 inside, improves combustion efficiency, reduces the boiler slagging scorification, reduces water-cooling wall surface oxidation corrosion.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (10)
1. A coal fired boiler structure characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the combustion structure (100) comprises water-cooled walls (101) arranged on the inner walls of the periphery of a boiler furnace, the boiler furnace (102) and a horizontal flue (103) positioned on the top of the boiler furnace (102);
air inlet structure (200), including being located adherence wind entry (201) of boiler furnace (102) downside, water-cooling wall (101) are kept away from one end top central point of adherence wind entry (201) and are put and are equipped with over fire air entry (202).
2. The coal-fired boiler structure according to claim 1, wherein: the water-cooled wall (101) is divided into a first side (101a) and a second side (101b), a cold ash hopper (104) is arranged at the tail of the first side (101a), and the second side (101b) is connected with a horizontal flue (103).
3. The coal-fired boiler structure according to claim 2, wherein: the adherence air inlet (201) is arranged at the position, close to the ash cooling hopper (104), of the first side (101 a).
4. The coal-fired boiler structure according to claim 3, wherein: the number of the adherence wind inlets (201) is two, and the adherence wind inlets are arranged on the same horizontal line.
5. The coal-fired boiler structure according to claim 4, wherein: the air inlet mode of the adherence air inlet (201) is tangential air inlet along the side wall of the boiler hearth (102).
6. The coal-fired boiler structure according to claim 5, wherein: the overfire air inlet (202) is arranged at the top center of the second side (101b) of the water wall (101), and the overfire air inlet (202) is opposite to the center of the boiler furnace (102).
7. The coal-fired boiler structure according to claim 6, wherein: the joint of the water-cooled wall (101) and the horizontal flue (103) is inwards sunken to form a flame folding angle (105).
8. The coal fired boiler structure according to claim 7, wherein: the side wall of the water cooling wall (101) is provided with a water cooling tank (101c), and the head end and the tail end of the water cooling tank (101c) are provided with a water inlet (101d) and a water outlet (101 e).
9. The coal fired boiler structure of claim 8, wherein: the cold ash bucket (104) is in a triangular shape.
10. The coal fired boiler structure according to claim 9, wherein: the horizontal flue (103) is vertically connected with a boiler furnace (102), and a platen superheater (103a) is arranged at the joint of the horizontal flue and the boiler furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021660368.8U CN213237491U (en) | 2020-08-11 | 2020-08-11 | Coal-fired boiler structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021660368.8U CN213237491U (en) | 2020-08-11 | 2020-08-11 | Coal-fired boiler structure |
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| CN213237491U true CN213237491U (en) | 2021-05-18 |
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| CN202021660368.8U Active CN213237491U (en) | 2020-08-11 | 2020-08-11 | Coal-fired boiler structure |
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