CN201621687U - Crossed heated screen with secondary wind injection of circulating fluid bed boiler - Google Patents
Crossed heated screen with secondary wind injection of circulating fluid bed boiler Download PDFInfo
- Publication number
- CN201621687U CN201621687U CN2009202946879U CN200920294687U CN201621687U CN 201621687 U CN201621687 U CN 201621687U CN 2009202946879 U CN2009202946879 U CN 2009202946879U CN 200920294687 U CN200920294687 U CN 200920294687U CN 201621687 U CN201621687 U CN 201621687U
- Authority
- CN
- China
- Prior art keywords
- heating screen
- air channel
- cross heating
- cross
- screen
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The utility model discloses a crossed heated screen with secondary wind injection of a circulating fluid bed boiler, which is placed in a hearth of the circulating fluid bed boiler. The hearth of the circulating fluid bed boiler comprises a wind distribution plate, a water cooling wall, a top ceiling, and a hearth of the circulating fluid bed boiler. The crossed heated screen with the secondary wind injection comprises a crossed heated screen and a cylindrical wind passage, wherein the lower part of the crossed heated screen is surrounded into the cylindrical wind passage through a bended pipe section, and the crossed heated screen and the cylindrical wind passage have film type walls. The crossed heated screen with the secondary wind injection of the circulating fluid bed boiler of the utility model provides the extension heated surface in the furnace, and simultaneously remains a space for material mixing in the furnace. A secondary wind injection opening arranged at the lower part can supplement the combustion required air to the center region of the hearth at the required height for realizing the grated combustion of the circulating fluid bed boiler and reducing the NOx exhaust.
Description
Technical field
The utility model relates to CFBB, relates in particular to a kind of cross heating screen of CFBB band secondary air jet.
Background technology
Along with the maximization and the high parameterization of recirculating fluidized bed (CFB) boiler, furnace height constantly increases, and all brings problem for boiler foundation, structural configuration and manufacturing cost, and it is the problem that must solve that CFB boiler maximization back boiler hearth heating surface rationally is set.On the other hand,, make the secondary wind of the CFB boiler that furnace cross-sectional area constantly increases be difficult to arrive the burner hearth central area, cause the burner hearth central area to be in anaerobic condition because that the momentum of impinging jet of CFB boiler secondary air is compared with the fluidisation momentum of emulsion zone bed material is less.Evidence, anoxic ubiquity in large circulating fluidized bed boiler in burner hearth center causes fuel combustion insufficient, and the flammable object height of boiler fly ash has particularly reduced the efficiency of combustion of CFB boiler.Therefore the problem of secondary wind penetration capacity deficiency also needed emphasis to solve after the CFB boiler maximized.
CFB boiler technology field has different technical schemes to solve the problem that exists in the maximization of CFB boiler at present.Applicant Alstom proposes to be provided with in lower furnace portion the method (patent publication No. CN1643302A) of separator, and bed surface is divided into two parts, and vertical burner hearth vertically is provided with the heat-exchange tube panel on the separator, as the extended surface of water-cooling wall.Applicant Xi'an Thermal Power Research Institute Co., Ltd. proposes the CFBB (patent publication No. CN 1621740A) of band curtain wall structure, can adopt a full partition wall heating surface that burner hearth is divided into two independent sectors, perhaps adopt a plurality of half partition wall heating surface mistakes to arrange and put, burner hearth still is the mode of one.Also propose simultaneously the scheme of overfiren air port to burner hearth center air feed to be set at complete reverse V-shaped position, partition wall bottom.Applicant Dongfang Boiler (Group) Co., Ltd. proposes with the boiler hearth of circulating fluidized bed of water-cooling wall mid-board (patent publication No. CN 200940824Y) back-to-back, adopt reverse V-shaped dividing wall and be located at dividing wall between pushing up with burner hearth with the fence type of upper and lower collection case back-to-back the water-cooling wall mid-board increase the burner hearth heat transfer area.Applicant Institute of Engineering Thernophysics, Academia Sinica proposes the boiler hearth of circulating fluidized bed (patent publication No. CN 101240893A) of band heating screen, and the membrane wall heating screen top of employing is vertical, and the bottom is by allowing pipe form bed material balance pipe.Also propose the heating screen bottom simultaneously and surround the mode of hollow posts burner hearth center air feed.Applicant Foster Wheeler Energia Co., Ltd proposes a kind of CFB boiler furnace evaporator surface structure (patent publication No. CN 101558265A), this structure is made of the vertical evaporator surface unit of two rows, is connected on the furnace roof by a kind of structure that can vertically move between evaporator surface unit and furnace roof.Applicant Institute of Engineering Thernophysics, Academia Sinica proposes the boiler hearth of circulating fluidized bed (patent publication No. CN101196297A) of band water-cooled column, the water-cooled column that a plurality of membrane walls surround is set in burner hearth, the space can be communicated with atmosphere up and down in the post, the air channel also can be set feed secondary wind.
Comprehensive existing various technical schemes generally take to be provided with the method for separator heating surface for solving the Surface of Large-scale CFB Boiler Layout Problem in burner hearth, bed surface is divided into two or more parts.By overfiren air port is set on the separator, add secondary wind from the burner hearth central area again.Though this method provides extended surface for burner hearth, influencing the mixing of material in the stove in varying degrees, cause the uniformity variation of material concentration, Temperature Distribution and heat transfer in the burner hearth.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of cross heating screen of CFBB band secondary air jet is provided.
The cross heating screen of CFBB band secondary air jet is placed in the boiler hearth of circulating fluidized bed, boiler hearth of circulating fluidized bed comprises air distribution plate, water-cooling wall, ceiling, boiler hearth of circulating fluidized bed, around the boiler hearth of circulating fluidized bed is water-cooling wall, the boiler hearth of circulating fluidized bed upper end is provided with ceiling, the boiler hearth of circulating fluidized bed lower end is provided with air distribution plate, the cross heating screen of band secondary air jet comprises cross heating screen and cylindricality air channel, the cross heating screen bottom is synthetic into the cylindricality air channel by bend loss, and cross heating screen and cylindricality air channel are membrane wall.
Described cross heating screen is one or more, is provided with connected space between cross heating screen and the cross heating screen and between cross heating screen and the furnace wall cooling.In the cylindricality air channel of described cross screen bottom secondary air channel is set, on the wall of cylindricality air channel by allowing pipe offer overfiren air port.The height in described cylindricality air channel and the ratio of cross heating screen total height are less than 0.5, and the height in cylindricality air channel is greater than 0.5 meter.Described membrane wall tube surface is provided with fin.Described fin height is 0.5～2.5 with the ratio of tube outer diameter, and fin width is 0.001～0.5 with the ratio of tube outer diameter.The cross sectional shape in described cylindricality air channel is rectangle, prismatic, and is circular or oval.Described cylindricality air channel wall is by allowing pipe that one or more layers overfiren air port is set.Described cylindricality air channel is as secondary air channel.Described cylindricality is provided with secondary air channel in the air channel.
The cross heating screen of CFB boiler band secondary air jet function of the present utility model provides in burner hearth in the abundant heating surface area, also leaves enough spaces and guarantees mixing of materials, thereby guarantee the uniformity of material concentration, temperature and heat transfer in the burner hearth; Cross heating screen is that two row's membrane wall pipes are arranged mutual orthogonal sets across structure, the physical strength height, and shock resistance is strong; Vertical two row's membrane wall extended surfaces and water-cooling wall are contour, and the situation of being heated is also similar to water-cooling wall, has guaranteed being heated evenly of burner hearth internal heating surface working medium, is particularly conducive to the hydrodynamic force security that improves boiler; The expansion fin increases the caloric receptivity that heat exchange is shielded to the cross heating screen of fin type surface texture by burn-on vertically in the side, and fin structure helps to alleviate impact and the wearing and tearing of the interior solid particle of stove to mid-board simultaneously; Cylindricality is provided with secondary air duct in the air channel, and at the required air of burner hearth central area aftercombustion, it is complete to help fuel combustion, the efficiency of combustion height, and reduce NO
xDischarging.
Description of drawings
Fig. 1 is the structural representation of the furnace chamber width of the utility model cross heating screen;
Fig. 2 is the structural representation of the furnace depth direction of the utility model cross heating screen;
Fig. 3 is the vertical view of the position, cylindricality air channel, bottom (A-A) of the utility model cross heating screen;
Fig. 4 is the vertical view of the cross screen position, top (B-B) of the utility model cross heating screen;
Fig. 5 for the utility model not with the structural representation of the cross heating screen of fin surface texture;
Fig. 6 is the structural representation of the cross heating screen of the utility model band fin surface texture;
Fig. 7 is the fin surface texture schematic diagram of the cross heating screen of the utility model band fin surface texture.
The specific embodiment
The cross heating screen of CFBB band secondary air jet is placed in the boiler hearth of circulating fluidized bed 4, boiler hearth of circulating fluidized bed 4 comprises air distribution plate 1, water-cooling wall 2, ceiling 3, boiler hearth of circulating fluidized bed 4, around the boiler hearth of circulating fluidized bed 4 is water-cooling wall 2, boiler hearth of circulating fluidized bed 4 upper ends are provided with ceiling 3, boiler hearth of circulating fluidized bed 4 lower ends are provided with air distribution plate 1, it is characterized in that comprising cross heating screen 5 and cylindricality air channel 6, cross heating screen 5 bottoms are synthetic into cylindricality air channel 6 by bend loss 7, and cross heating screen 5 and cylindricality air channel 6 are membrane wall.
Described cross heating screen 5 is one or more, is provided with connected space 10 between cross heating screen and the cross heating screen and between cross heating screen and the furnace wall cooling 2.Described cross shields in the cylindricality air channel 6 of 5 bottoms secondary air channel 9 is set, on 6 walls of cylindricality air channel by allowing pipe offer overfiren air port 8.The ratio of the height in described cylindricality air channel 6 and cross heating screen 5 total heights is less than 0.5, and the height in cylindricality air channel 6 is greater than 0.5 meter.Described membrane wall tube surface is provided with fin 9.Described fin 9 height are 0.5～2.5 with the ratio of tube outer diameter, and fin width is 0.001～0.5 with the ratio of tube outer diameter.The cross sectional shape in described cylindricality air channel 6 is rectangle, prismatic, and is circular or oval.Described cylindricality air channel 6 walls are by allowing pipe that one or more layers overfiren air port 8 is set.Described cylindricality air channel 6 is as secondary air channel.In the described cylindricality air channel 6 secondary air channel 9 is set.
The course of work of the present utility model is as follows
Referring to Fig. 1～5, the cross heating screen of band secondary air jet of the present utility model is arranged in the boiler hearth of circulating fluidized bed of being made up of air distribution plate 1, water-cooling wall 2 and ceiling 34, its height is identical with furnace height, be provided with along furnace width center line or degree of depth center line, reserve connected space 10 between cross heating screen and the cross heating screen and between cross heating screen 5 and the water-cooling wall 2, to realize the even mixing of material in the burner hearth.Cross heating screen 5 is made up of membrane wall, is connected with working medium in the membrane wall pipe from bottom to top, absorbs the heat that the burner hearth internal combustion generates.
Referring to Fig. 2, the height H of cross heating screen 5
0Be full furnace height, the bottom surrounds secondary air duct by bend pipe can replenish secondary wind, the height H in cylindricality air channel 6 to the burner hearth central area
1With cross heating screen 5 height H
0Ratio H
1/ H
0For less than 0.5, and the height H in cylindricality air channel 6
1Greater than 0.5 meter.Referring to Fig. 3, the cross sectional shape in cylindricality air channel, cross heating screen 5 bottom 6 can be a rectangle, prismatic, and circle, or oval.Cylindricality air channel 6 itself is as secondary air channel, secondary air channel 9 perhaps is set in cylindricality air channel 6 carries out secondary wind and supply with, the additional burner hearth required oxygen that burns.
Referring to Fig. 6, the membrane wall of heating screen 5 is provided with the fin surface texture.Referring to Fig. 7, cross heating screen 5 finned membrane walls, its fin height is 0.5～2.5 with tube outer diameter than h/d scope, fin width is 0.001～0.5 with tube outer diameter than b/d scope.
Leave enough spaces between the cross heating screen of CFBB band secondary air jet of the present utility model and be used for an interior mixing of materials, in guaranteeing burner hearth under material concentration, temperature and the uniform prerequisite of heat transfer, solve the problem of large circulating fluidized bed boiler heating surface difficult arrangement, reduce furnace height, strengthen furnace heating surface intensity.Cross screen bottom surrounds secondary air duct by bend pipe and can replenish secondary wind to the burner hearth central area simultaneously, and it can obviously improve the air distribution of burner hearth and the combustion position of burner hearth inside, reduces NO
xDischarging improves the efficiency of combustion of fuel in burner hearth.
Claims (10)
1. the cross heating screen of a CFBB band secondary air jet, be placed in the boiler hearth of circulating fluidized bed (4), boiler hearth of circulating fluidized bed (4) comprises air distribution plate (1), water-cooling wall (2), ceiling (3), boiler hearth of circulating fluidized bed (4), boiler hearth of circulating fluidized bed (4) is water-cooling wall (2) all around, boiler hearth of circulating fluidized bed (4) upper end is provided with ceiling (3), boiler hearth of circulating fluidized bed (4) lower end is provided with air distribution plate (1), it is characterized in that comprising cross heating screen (5) and cylindricality air channel (6), cross heating screen (5) bottom is synthetic into cylindricality air channel (6) by bend loss (7), and cross heating screen (5) and cylindricality air channel (6) are membrane wall.
2. the cross heating screen of a kind of CFBB band secondary air jet according to claim 1, it is characterized in that described cross heating screen (5) for one or more, is provided with connected space (10) between cross heating screen and the cross heating screen and between cross heating screen and the furnace wall cooling (2).
3. the cross heating screen of a kind of CFBB band secondary air jet according to claim 1, it is characterized in that in the cylindricality air channel (6) of described cross screen (5) bottom secondary air channel (9) being set, on the wall of cylindricality air channel (6) by allowing pipe offer overfiren air port (8).
4. the cross heating screen of a kind of CFBB band secondary air jet according to claim 1, the ratio that it is characterized in that the height in described cylindricality air channel (6) and cross heating screen (5) total height is less than 0.5, and the height of cylindricality air channel (6) is greater than 0.5 meter.
5. the cross heating screen of a kind of CFBB band secondary air jet according to claim 1 is characterized in that described membrane wall tube surface is provided with fin (9).
6. the cross heating screen of a kind of CFBB band secondary air jet according to claim 5 is characterized in that described fin (9) height and the ratio of tube outer diameter are 0.5～2.5, and fin width is 0.001～0.5 with the ratio of tube outer diameter.
7. the cross heating screen of a kind of CFBB band secondary air jet according to claim 1, the cross sectional shape that it is characterized in that described cylindricality air channel (6) is rectangle, prismatic, and is circular or oval.
8. the cross heating screen of a kind of CFBB band secondary air jet according to claim 1 is characterized in that described cylindricality air channel (6) wall is by allowing pipe that one or more layers overfiren air port (8) is set.
9. the cross heating screen of a kind of CFBB band secondary air jet according to claim 1 is characterized in that described cylindricality air channel (6) is as secondary air channel.
10. the cross heating screen of a kind of CFBB band secondary air jet according to claim 1 is characterized in that being provided with in the described cylindricality air channel (6) secondary air channel (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202946879U CN201621687U (en) | 2009-12-22 | 2009-12-22 | Crossed heated screen with secondary wind injection of circulating fluid bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202946879U CN201621687U (en) | 2009-12-22 | 2009-12-22 | Crossed heated screen with secondary wind injection of circulating fluid bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201621687U true CN201621687U (en) | 2010-11-03 |
Family
ID=43025142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202946879U Expired - Fee Related CN201621687U (en) | 2009-12-22 | 2009-12-22 | Crossed heated screen with secondary wind injection of circulating fluid bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201621687U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102997231A (en) * | 2012-12-31 | 2013-03-27 | 中国科学院工程热物理研究所 | Large circulating fluidized bed boiler, air distribution device and air distribution device assembly |
-
2009
- 2009-12-22 CN CN2009202946879U patent/CN201621687U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102997231A (en) * | 2012-12-31 | 2013-03-27 | 中国科学院工程热物理研究所 | Large circulating fluidized bed boiler, air distribution device and air distribution device assembly |
| CN102997231B (en) * | 2012-12-31 | 2015-06-24 | 中国科学院工程热物理研究所 | Large circulating fluidized bed boiler, air distribution device and air distribution device assembly |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101749697A (en) | Circulating fluidized bed boiler hearth with grand-cross penetrating middle wall structure | |
| CN101718430B (en) | Cross heating screen with secondary air jet for circulating fluidized bed boiler | |
| CN102967048B (en) | Indirect hot-air furnace using alcohol base liquid fuels | |
| CN100575782C (en) | The boiler hearth of circulating fluidized bed of band heating screen | |
| CN202747611U (en) | Upright bottom burning gas heat transfer fluid furnace | |
| CN101398169B (en) | Coal-burning installation of small-sized industrial circulating fluid bed | |
| CN201621687U (en) | Crossed heated screen with secondary wind injection of circulating fluid bed boiler | |
| CN201621686U (en) | Hearth of circulating fluid bed boiler with large crosswise-penetrated middle partition wall structure | |
| CN201636837U (en) | Mid-board water cooled wall of hearth of circulating fluidized bed boiler | |
| CN202532953U (en) | Jet flow pipe and jet flow heat exchanger with same | |
| CN117028987A (en) | Vertical water pipe built-in premixing membrane type wall cooling burner and gas boiler | |
| CN211367621U (en) | Top combustion hot blast stove with tapered regenerative chamber | |
| CN111412656B (en) | Combustion heat exchange integrated gas heating wall-mounted furnace body | |
| CN202470443U (en) | Heat-absorbing surface structure of chain organic heat carrier furnace | |
| CN102338465B (en) | Warm-air furnace used for high temperature sterilization | |
| CN201203140Y (en) | Plate shell type air pre-heating device | |
| CN201306833Y (en) | Hot water exchanger | |
| CN202188495U (en) | Superconducting material heat exchange normal-pressure energy-saving boiler with long flue duct | |
| CN202303901U (en) | Heat exchanger of hot-blast stove | |
| CN215628076U (en) | Novel 19-hole checker brick | |
| CN112228903B (en) | Three-channel type combustion chamber flame tube wall surface structure with longitudinal vortex generator | |
| CN202947314U (en) | Indirect type hot-blast furnace using alcohol-base liquid fuel | |
| CN206959327U (en) | Gas fired-boiler | |
| CN203216046U (en) | Solar receiver | |
| CN202188634U (en) | Superconducting material heat exchange normal-pressure energy-saving boiler with multiple flue ducts |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20101103 Termination date: 20121222 |