CN218442228U - Membrane type convection evaporation heating unit and boiler tail flue structure - Google Patents
Membrane type convection evaporation heating unit and boiler tail flue structure Download PDFInfo
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- CN218442228U CN218442228U CN202222204731.0U CN202222204731U CN218442228U CN 218442228 U CN218442228 U CN 218442228U CN 202222204731 U CN202222204731 U CN 202222204731U CN 218442228 U CN218442228 U CN 218442228U
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Abstract
The utility model belongs to the technical field of the boiler. The membrane type evaporation heating unit comprises a plurality of membrane type evaporation heating surfaces which are arranged in a flue side by side, wherein each membrane type evaporation heating surface comprises a light pipe and a fin which are arranged in an S-shaped winding mode, each light pipe comprises a straight pipe section and an elbow section, and the end parts of two adjacent straight pipe sections are communicated through the elbow sections; fins are arranged between every two adjacent straight pipe sections, and the upper end and the lower end of each fin are sealed and fixed with the corresponding straight pipe section. Also discloses a boiler tail flue structure. This application structural design is reasonable, can arrange great heating surface in limited space, reduces the heating surface wearing and tearing that the flue gas series flow caused.
Description
Technical Field
The utility model belongs to the technical field of the boiler, concretely relates to membrane formula convection current evaporation is heated unit and boiler afterbody flue structure.
Background
The whole structure of the circulating fluidized bed steam boiler generally adopts a single steam drum type, and for saturated steam or micro-superheated steam boilers, because no superheater or a smaller superheater area exists, the temperature of smoke entering an economizer is very high, and the safe operation of the economizer is threatened. In order to ensure the safe operation of the economizer, a convection evaporation heating surface is required to be arranged in front of the economizer so as to reduce the inlet smoke temperature of the economizer.
However, the convection evaporation heating surfaces adopted at present are all in a light pipe form, and on one hand, the heating surfaces occupy large space, especially have large size in the height direction, and influence the overall arrangement of the heating surfaces in the tail flue; on the other hand, the abrasion is serious, and the long-term safe operation of the boiler is influenced.
Disclosure of Invention
The utility model aims at the problem that the aforesaid exists with not enough, provide a membrane convection evaporation heated unit and boiler afterbody flue structure, its structural design is reasonable, can arrange great heated surface in limited space, reduce the heated surface wearing and tearing that the flue gas series flow caused.
In order to realize the purpose, the adopted technical scheme is as follows:
a membrane-based convective evaporative heating unit comprising a plurality of membrane-based evaporative heating surfaces arranged side-by-side in a flue, said membrane-based evaporative heating surfaces comprising:
the light pipe is arranged in an S-shaped winding manner and comprises straight pipe sections and elbow sections, and the end parts of two adjacent straight pipe sections are communicated through the elbow sections; and
the fin is arranged between every two adjacent straight pipe sections, and the upper end and the lower end of each fin are fixedly sealed with the corresponding straight pipe section.
By the design of the structure, a film type convection evaporation heating surface can be formed. Therefore, more heating surfaces can be arranged in a smaller space, the height size of the heating surface can be reduced under the condition of keeping the total heat absorption quantity unchanged, and the integral arrangement of the heating surface in the tail flue is fully facilitated; on the other hand, the film convection evaporation heating surface divides the flue into a plurality of independent small flues which are not communicated with each other, and smoke in each small flue is not in series flow with each other, so that the heating surface abrasion of the light pipe heating surface caused by the smoke flowing around the pipes is avoided; meanwhile, a small flue formed by the ash-containing flue gas in the membrane type tube bank is in a flowing state that larger ash particles tend to the middle and fine ash particles tend to the two sides, so that the abrasion of a heating surface is further reduced.
The fins are flat steel and are welded and fixed with the straight pipe sections.
To the material of fin, the band steel is adopted in this application, can effectual control cost, also can make things convenient for welded fastening to provide better heat transfer effect, the practicality is better.
And a plurality of film-type evaporation heating surfaces are arranged at equal intervals. Through equidistant interval arrangement for the flue forms the interval of relatively independent flue gas circulation, and the effect of flow equalizing is better, can more effectual control inside flue gas flow state.
And the uppermost straight pipe section of each membrane type evaporation heating surface is arranged in an upward inclined manner. The water power safety of the evaporation heating surface can be realized by the inclined upward arrangement of the light pipes in the first row on the windward side, and the long-term safe and stable operation of the boiler is ensured.
The light pipes in the film type evaporation heating surface are communicated in sequence; or
The upper end and the lower end of the light pipe in each film type evaporation heating surface are respectively communicated with the water outlet pipe and the water inlet pipe.
According to a specific design structure, different structural forms can be selected to realize the communication of the plurality of film type evaporation heating surfaces, so that the flow of the internal water body is convenient to ensure, and the application effect of the film type evaporation heating surfaces is improved.
The utility model provides a boiler afterbody flue structure, is including the membrane type convection current evaporation heating unit and the economizer as above-mentioned that lay in proper order in the flue.
The system also comprises a superheater arranged at the front end of the membrane type convection evaporation heating unit and an air preheater arranged at the rear end of the economizer.
Through the arrangement of the membrane type convection evaporation heating units, the space of a flue can be effectively utilized, the heat absorption capacity in unit area is optimized, and therefore the inlet flue gas temperature of the economizer is effectively reduced.
By adopting the technical scheme, the beneficial effects are as follows:
the heating surface heat exchanger can optimize the overall arrangement of the heating surface in a limited flue space and under a limited height size, and can change the flow state of soot particles with different particle sizes in the flue through the mutually independent small flues, thereby reducing the abrasion to the heating surface and ensuring the long-term safe and stable operation of a boiler.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly described hereinafter. The drawings are intended to depict only some embodiments of the invention, and not all embodiments of the invention are limited thereto.
Fig. 1 is a schematic structural view of a boiler tail flue structure of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a membrane-type convection evaporation heating unit according to an embodiment of the present invention.
Fig. 3 isbase:Sub>A schematic view of the structure in the direction ofbase:Sub>A-base:Sub>A in fig. 2.
Number in the figure:
100 is a mode evaporation heating surface, 110 is a light pipe, 111 is a straight pipe section, 112 is an elbow section, and 120 is a fin;
200 is a flue;
310 is a superheater, 320 is an economizer, 330 is an air preheater.
Detailed Description
The embodiments of the present invention will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It should be noted that when an element is referred to as being "connected," "coupled," or "connected" to another element, it can be directly connected, coupled, or connected, but it should be understood that intervening elements may be present therebetween; i.e., positional relationships encompassing both direct and indirect connections.
It should be noted that the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items.
It should be noted that terms indicating orientation or positional relationship such as "upper", "lower", "left", "right", and the like, are used only for indicating relative positional relationship, which is for convenience of describing the present invention, and not that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation; when the absolute position of the object to be described is changed, the relative positional relationship may also be changed accordingly.
Referring to fig. 1-3, the application discloses a membrane-type convection evaporation heating unit, which comprises a plurality of membrane-type evaporation heating surfaces 100 arranged in a flue 200 side by side, wherein each membrane-type evaporation heating surface 100 comprises a light pipe 110 and a fin 120 which are coiled in an S shape, each light pipe 110 comprises a straight pipe section 111 and an elbow section 112, and the end parts of two adjacent straight pipe sections 111 are communicated through the elbow section 112; fins 120 are arranged between two adjacent straight pipe sections 111, and the upper end and the lower end of each fin 120 are sealed and fixed with the corresponding straight pipe section 111. By the design of the structure, a film type convection evaporation heating surface can be formed. Therefore, more heating surfaces can be arranged in a smaller space, the height size of the heating surface can be reduced under the condition of keeping the total heat absorption quantity unchanged, and the integral arrangement of the heating surface in the tail flue is facilitated; on the other hand, the film convection evaporation heating surface divides the flue into a plurality of independent small flues which are not communicated with each other, and smoke in each small flue is not in series flow with each other, so that the heating surface abrasion of the light pipe heating surface caused by the smoke flowing around the pipes is avoided; meanwhile, the small flue formed by the ash-containing flue gas in the membrane type tube bank is in a flowing state that larger ash particles tend to the middle and fine ash particles tend to the two sides, so that the abrasion of a heating surface is further reduced.
The fin 120 of the present application is flat steel, and the fin 120 and the straight tube section 111 are welded and fixed. To the material of fin 120, this application adopts the band steel, can effectual control cost, also can make things convenient for welded fastening to provide better heat transfer effect, the practicality is better.
Further, a plurality of the film-type evaporation heating surfaces 100 in the present embodiment are arranged at equal intervals. Through equidistant interval arrangement for the flue forms the interval of relatively independent flue gas circulation, and the effect of flow equalizing is better, can more effectual control inside flue gas flow state.
In order to ensure the hydrodynamic safety of the evaporation heating surface, the uppermost straight tube section 111 of each membrane-type evaporation heating surface 100 is inclined upward. Namely, the first row of light pipes on the windward side are arranged upwards in an inclined mode, and the long-term safe and stable operation of the film type convection evaporation heating unit can be achieved.
The light pipes 110 in the film evaporation heating surfaces 100 are communicated in sequence. Or a water inlet pipe and a water outlet pipe can be arranged, so that the upper end and the lower end of the light pipe in each film type evaporation heating surface are respectively communicated with the water outlet pipe and the water inlet pipe. According to a specific design structure, different structural forms can be selected to realize the communication of the plurality of film type evaporation heating surfaces, so that the flow of the internal water body is convenient to ensure, and the application effect of the film type evaporation heating surfaces is improved.
The application also discloses a boiler tail flue structure, including the above-mentioned membrane type convection evaporation heating unit and the economizer 320 that lay in flue 200 in proper order. And the system also comprises a superheater 310 arranged at the front end of the membrane type convection evaporation heating unit and an air preheater 330 arranged at the rear end 320 of the economizer. Through the arrangement of the membrane type convection evaporation heating units, the space of a flue can be effectively utilized, the heat absorption capacity in unit area is optimized, and therefore the inlet flue gas temperature of the economizer is effectively reduced.
While the above description has described in detail the preferred embodiments for carrying out the invention, it should be understood that these embodiments are presented by way of example only, and are not intended to limit the scope, applicability, or configuration of the invention in any way. The scope of the invention is defined by the appended claims and equivalents thereof. Many modifications may be made to the foregoing embodiments by those skilled in the art in light of the teachings of the present disclosure, and such modifications are intended to be within the scope of the present disclosure.
Claims (7)
1. A membrane-type convection evaporation heating unit is characterized by comprising a plurality of membrane-type evaporation heating surfaces which are arranged in a flue side by side, wherein the membrane-type evaporation heating surfaces comprise:
the light pipe is arranged in an S-shaped winding manner and comprises straight pipe sections and elbow sections, and the end parts of two adjacent straight pipe sections are communicated through the elbow sections; and
the fin is arranged between every two adjacent straight pipe sections, and the upper end and the lower end of each fin are hermetically fixed with the corresponding straight pipe section.
2. The membrane type convective evaporative heating unit of claim 1, wherein the fins are flat steel and are welded to the straight tube section.
3. The membrane-type convective evaporative heating unit according to claim 1, wherein a plurality of membrane-type evaporative heating surfaces are arranged at equal intervals.
4. The membrane-type convective evaporative heating unit according to any one of claims 1 to 3, wherein the uppermost straight tube section of each of said membrane-type evaporative heating surfaces is inclined upward.
5. The membrane-type convective evaporative heating unit according to claim 1, wherein the light pipes in the plurality of membrane-type evaporative heating surfaces are in sequential communication; or
The upper end and the lower end of the light pipe in each film type evaporation heating surface are respectively communicated with the water outlet pipe and the water inlet pipe.
6. A boiler tail flue structure, characterized by comprising the membrane type convection evaporation heating unit and the coal economizer which are arranged in the flue in sequence and are as claimed in any one of claims 1 to 5.
7. The boiler back flue structure according to claim 6, further comprising a superheater disposed at a front end of the membrane-type convection evaporation heating unit and an air preheater disposed at a rear end of the economizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222204731.0U CN218442228U (en) | 2022-08-22 | 2022-08-22 | Membrane type convection evaporation heating unit and boiler tail flue structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222204731.0U CN218442228U (en) | 2022-08-22 | 2022-08-22 | Membrane type convection evaporation heating unit and boiler tail flue structure |
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| Publication Number | Publication Date |
|---|---|
| CN218442228U true CN218442228U (en) | 2023-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222204731.0U Active CN218442228U (en) | 2022-08-22 | 2022-08-22 | Membrane type convection evaporation heating unit and boiler tail flue structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218442228U (en) |
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- 2022-08-22 CN CN202222204731.0U patent/CN218442228U/en active Active
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