CN1233952C - Radiation screen type overheater for regulating inlet smoke flow distribution - Google Patents
Radiation screen type overheater for regulating inlet smoke flow distribution Download PDFInfo
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- CN1233952C CN1233952C CN 03150781 CN03150781A CN1233952C CN 1233952 C CN1233952 C CN 1233952C CN 03150781 CN03150781 CN 03150781 CN 03150781 A CN03150781 A CN 03150781A CN 1233952 C CN1233952 C CN 1233952C
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- screen
- flue gas
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- flow
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Abstract
The present invention relates to a radiation screen superheater adjusting the flow distribution of inlet smoke gas, which belongs to the boiler field of mechanical engineering. The present invention is composed of screen plates, a header and a flow channel among the screen plates, wherein each screen plate is formed by bending a plurality of circular pipes and is divided into a vertical screen section at the upper end and deflecting screen sections, and the lower ends of the deflecting screen sections deflect in an inclined angle toward the flow channel among the screen plates and the plane of the top of a boiler. The adjacent deflecting screen sections form an inlet flow channel among the screen plates, the screen plates are arranged along the direction of the depth of a hearth with height change, and the inlet ends and the outlet ends of the steam sides of the screen plates are respectively connected with the header. The present invention is capable of effectively solving the problem that the flow of smoke gas of the flow channel among the screen plates of a radiation screen is not uniformly distributed by rotary ascending gas flow in the hearth, has the advantages of obvious effect of controlling the flow distribution of the smoke gas among the screen plates, simple structure, convenient installation, easy enforcement, etc., is capable of effectively overcoming the problem of thermal deviation of a superheater and a reheater of the horizontal flue of the boiler, and has great application prospects in the technical field of large capacity boilers.
Description
Technical field
What the present invention relates to is a kind of radiation pendant superheater that is arranged in furnace of power-plant boilers top, the especially a kind of radiation pendant superheater that can regulate the inlet flue gas assignment of traffic in upper furnace.Belong to the field of boilers in the mechanical engineering.
Background technology
Superheater is the important component part of power boiler.Superheater is divided into the radiation pendant superheater (claiming division pendant superheater again) that is arranged in the burner hearth and is arranged in the convection superheater in the horizontal flue and afterbody vertical gas pass behind the furnace outlet.In the DC burner boiler that quadrangle tangential circle is arranged, the conventional employing of the radiation pendant superheater of upper furnace is even at interval along furnace depth, the neat high arrangement in base.Along with modern boiler develops to vast capacity and ultra-high parameter direction, it is seriously uneven that the flue gas residual rotation causes the flue gas flow that enters runner between each screen of radiation pendant superheater in the burner hearth, and then cause the furnace outlet horizontal flue along the aggravation of width heating power deviation, cause convection superheater and reheater overtemperature tube burst accident in the horizontal flue when serious.
At present, at the problem that causes convection superheater and reheater fume side thermal deviation, generally take to reduce the measure of the flue gas residual rotation intensity that the quadrangle tangential circle jet forms in the burner hearth.In fact, quadrangle tangential circle arrange that the residual rotation that removes smoke fully in the burner hearth had not both had may be also unnecessary.Cut down the flue gas residual rotation significantly, will fundamentally restrict giving full play to of corner tangential firing mode advantage, thereby, there is no need to eliminate fully the remaining flue gas rotation in the corner tangential firing mode.But its influence for superheater and reheater overtemperature problem also must be managed to solve.
Find by literature search, Chinese patent title: station boiler division pendant superheater, the patent No.: ZL99226485.5, its architectural feature of station boiler division pendant superheater of this patent disclosure is that the pendant superheater that is arranged in burner hearth top respectively shields sheet and is to the certain angle of the whole deflection of hearth biside wall.Its objective is the little burner hearth flue middle part of avris flue gas guiding flue gas flow that flow is big between will shielding by flow guiding screen.Try hard to reduce the inhomogeneities that the horizontal flue inlet flue gas distributes behind the furnace outlet.The deficiency of this technology is that this deflection way arranges the complexity of bringing extremely for burner hearth furnace roof tubular construction, and therefore has influence on its practicality.
In further retrieving, still find no at improving radiation of burner hearth pendant superheater bottom inlet segment structure and solve the bibliographical information that enters flue gas flow channel flow uniform distribution between radiation shield superheater screen.
Summary of the invention
The present invention is directed to the above-mentioned deficiency of prior art, provide a kind of and regulate the radiation pendant superheater that enters flue gas flow channel inlet flue gas assignment of traffic between the radiation shield screen by changing radiation pendant superheater bottom inlet segment structure, this superheater has simple in structure, easy for installation, advantage easy to implement can effectively be controlled the thermal deviation of horizontal flue along width.
The present invention is achieved by the following technical solutions, the radiation pendant superheater that the present invention regulates the inlet flue gas assignment of traffic divides between shield sheet, header and screen flue gas flow channel to form by the elongated degree that is arranged in order along furnace depth, the screen sheet is to be bent by many pipes to form, it is divided into two parts, and promptly vertical screen section in upper end and lower end flue gas flow channel and furnace roof plane between screen is the angle of inclination and curves the deflection screen that forms section.Adjacent deflection screen section constitutes smoke inlet runner between screen again.The import and export end of screen sheet steam side is connected with the furnace roof header respectively.Along furnace depth, the area of runner inlet is different with the situation of incoming flow according to its position in the furnace depth direction between screen.
One aspect of the present invention screen sheet is arranged along furnace depth direction degree of uprising, and utilizes the difference in height of screen to control the inhomogeneous distribution of burner hearth flue gas residual rotation to screen inlet flue gas flow.On the other hand, screen sheet lower end shape is distributed according to different flue gas flows, and flue gas flow channel and furnace roof plane are the angle of inclination and curve and form deflection screen section between screen.Deflection by the screen entrance changes runner inlet area between screen, controls the assignment of traffic of burner hearth rising flue gas to each runner between screen.Particularly, along the furnace depth direction, be in flue gas bottom horizontal flow sheet component and adopt long screen design in the same side mutually with burner hearth flue gas direction of rotation, promptly shielding base fabric, to put relative position lower, increase the inlet flow resistance in view of the above, cut down the rotation flue gas and enter flow between this side screen, and and then play the effect of regulating other screen inlet flow rate.Simultaneously, make that this side screen entrance plane, bottom flue gas flow channel between screen is inboard to be the angle of inclination with the furnace roof plane and to arrange, reducing inlet area between screen, thereby further reduce the inlet flue gas flow.Be in the opposite side with burner hearth flue gas direction of rotation of flue gas bottom horizontal flow sheet component and adopt short screen design, promptly shielding base fabric, to put relative position higher, reduces the flow resistance that enters the mouth in view of the above, increases the rotation flue gas and enter flow between this side screen.Simultaneously, make this side shield runner outside between screen, entrance plane, bottom and be the angle of inclination layout,, thereby further increase the flue gas flow that enters the mouth with inlet area between the increase screen with furnace roof plane.Runner between the lower screen of central authorities' flow, its both sides screen inlet screen section of forming runner adopts outer design partially, to increase the inlet flue gas flow.
The present invention has substantive distinguishing features and marked improvement.Structural design by height screen and screen bottom deflection solves the uniform distribution problem of burner hearth rotation ascending air for runner flue gas flow between radiation shield screen sheet.Have between control flow advantages such as flue gas flow distribution effect is remarkable, simple in structure, easy for installation, easy to implement.Can overcome the problem of boiler horizontal gas pass superheater and reheater thermal deviation effectively, have good application prospects in the heavy duty boiler technical field.
Description of drawings
Fig. 1. pendant superheater structure of the present invention and the schematic diagram of in burner hearth, arranging
Fig. 2. the downward projection figure that pendant superheater structure of the present invention is arranged in burner hearth
Fig. 3. perspective view is looked on the right side that pendant superheater structure of the present invention is arranged in burner hearth.
Wherein, low-temperature zone convection current reheater 11, the interior high temperature convection superheater 12 of burner hearth in high temperature section convection current reheater 10, the burner hearth in inlet flue gas runner 6, Chang Ping district 7, short screen district 8, central authorities screen district 9, the burner hearth between flue gas flow channel 3, vertical screen section 4, deflection screen section 5, screen between screen sheet 1, header 2, screen.
The specific embodiment
As Fig. 1, Fig. 2 and shown in Figure 3, the present invention is made up of flue gas flow channel 3 between screen sheet 1, header 2 and screen, screen sheet 1 is bent by many pipes and forms, screen sheet 1 is divided into two parts, promptly vertical screen section 4 in upper end and lower end runner and furnace roof plane between screen is the angle of inclination and curves the deflection screen that forms sections 5, adjacent deflection screen section constitutes smoke inlet runner 6 between screen again, the import and export end of screen sheet 1 steam side links to each other with header 2 respectively, each adjacent screen sheet constitutes flue gas flow channel 3 between screen, and screen sheet 1 is arranged along furnace depth direction degree of uprising.
Screen sheet 1 lower end shape is distributed according to flue gas flow, and flue gas flow channel 3 and furnace roof plane are the angle of inclination and curve and form deflection screen section 5 between screen.
Along the furnace depth direction, be in flue gas bottom horizontal flow sheet component and burner hearth flue gas direction of rotation and adopt long screen design in the same side 7 mutually, promptly this side screen sheet 1 bottom arranges that relative position is lower, cuts down rotational flow in view of the above and enters flow between this side screen.Simultaneously, the inboard of this side screen sheet entrance plane, 1 bottom flue gas flow channel between this screen and furnace roof plane are the angle of inclination and curve and form deflection screen sections 5, with inlet area between reducing to shield, thereby further reduce the inlet flue gas flow.
Be in the opposite side 8 with burner hearth flue gas direction of rotation of flue gas bottom horizontal flow sheet component and adopt the design of weak point screen, promptly this side screen sheet 1 bottom arranges that relative position is higher, and increase rotation flue gas enters the flue gas flow between this side screen in view of the above.Simultaneously, although the relative middle section of this side flue gas rate of climb component is high, but, it is totally still less than normal to enter between screen flue gas flow, therefore, the outside of this side screen sheet entrance plane, 1 bottom flue gas flow channel between this screen and furnace roof plane are the angle of inclination and curve and form deflection screen section 5, increasing inlet area between screen, thus the further effective increase flue gas flow that enters the mouth.
Central authorities' screen district 9 entrances that central authorities' flow is lower adopt outer design partially.The below of runner 3 is near burner hearth central authorities between screen, flue gas rate of climb component is relatively low, it is totally less than normal to enter between screen flow, so make screen entrance plane, sheet 1 bottom flue gas flow channel 3 outsides and furnace roof plane between this screen be the angle of inclination layout, to increase inlet area between screen, flue gas flow thereby effective increase enters the mouth.
Claims (1)
1, a kind of radiation pendant superheater of regulating the inlet flue gas assignment of traffic, by screen sheet (1), flue gas flow channel (3) is formed between the screen that header (2) and each adjacent screen sheet constitute, screen sheet (1) is bent by many pipes and forms, advancing of screen sheet steam side, the port of export links to each other with header (2) respectively, it is characterized in that, screen sheet (1) is divided into two parts, promptly vertical screen section in upper end (4) and lower end and furnace roof plane are the angle of inclination and curve the deflection that forms and shield section (5), space between the adjacent deflection screen section constitutes inlet flue gas runner (6) between screen, screen sheet (1) is elongated degree design along the employing of furnace depth direction, be in flue gas bottom horizontal flow sheet component and the long screen design of the same side (7) employing mutually of burner hearth flue gas direction of rotation, promptly this side screen sheet (1) bottom arranges that relative position is lower, simultaneously, the inboard of this side screen entrance plane, sheet (1) bottom flue gas flow channel between this screen, being the angle of inclination with the furnace roof plane curves and forms deflection screen section (5); Be in the opposite side of flue gas bottom horizontal flow sheet component (8) and adopt short screen design with burner hearth flue gas direction of rotation, promptly this side screen sheet (1) bottom arranges that relative position is higher, simultaneously, the outside of this side screen entrance plane, sheet (1) bottom flue gas flow channel between this screen, be the angle of inclination with the furnace roof plane and curve and form deflection screen section (5); Screen district (9) entrance that central authorities' flow is lower adopts outer design partially.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03150781 CN1233952C (en) | 2003-09-04 | 2003-09-04 | Radiation screen type overheater for regulating inlet smoke flow distribution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03150781 CN1233952C (en) | 2003-09-04 | 2003-09-04 | Radiation screen type overheater for regulating inlet smoke flow distribution |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1492181A CN1492181A (en) | 2004-04-28 |
| CN1233952C true CN1233952C (en) | 2005-12-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03150781 Expired - Fee Related CN1233952C (en) | 2003-09-04 | 2003-09-04 | Radiation screen type overheater for regulating inlet smoke flow distribution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1233952C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9539302B2 (en) | 2009-06-18 | 2017-01-10 | Allergan, Inc. | Safe desmopressin administration |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798131B (en) * | 2012-09-07 | 2016-04-06 | 中国东方电气集团有限公司 | A kind of boiler preventing contamination coking |
| CN103196127B (en) * | 2013-03-29 | 2014-11-12 | 上海锅炉厂有限公司 | Design method of heating surfaces of power station boiler |
-
2003
- 2003-09-04 CN CN 03150781 patent/CN1233952C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9539302B2 (en) | 2009-06-18 | 2017-01-10 | Allergan, Inc. | Safe desmopressin administration |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1492181A (en) | 2004-04-28 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051228 Termination date: 20091009 |