CN202024322U - Low wind pressure circulating fluidized bed boiler - Google Patents
Low wind pressure circulating fluidized bed boiler Download PDFInfo
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- CN202024322U CN202024322U CN2011200624276U CN201120062427U CN202024322U CN 202024322 U CN202024322 U CN 202024322U CN 2011200624276 U CN2011200624276 U CN 2011200624276U CN 201120062427 U CN201120062427 U CN 201120062427U CN 202024322 U CN202024322 U CN 202024322U
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- wind
- blast
- secondary wind
- cfbb
- fluidized bed
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Abstract
The utility model discloses a low wind pressure circulating fluidized bed boiler which comprises a furnace chamber, an upper secondary wind branch pipe, a lower secondary wind branch pipe, a secondary wind nozzle, a split-flow platform, a wind cap, bed material and a primary wind pipe; the fluidized bed boiler is characterized in that with the adoption of the split-flow platform, the secondary wind nozzle is enlarged, the section of the upper secondary branch wind pipe is changed, the lower secondary wind branch pipe is changed, the nozzle of a sleeve in the wind cap is enlarged, and the thickness of the bed material is changed. With the adoption of the low wind pressure circulating fluidized bed boiler, the outlet wind pressure of a secondary fan can be controlled in 8500-6500Pa, the outlet wind pressure of a primary fan can be controlled in 11000Pa-9000Pa, the resistance of the wind cap can be adjusted to 25000-3000Pa, the energy consumption of the fan and a motor can be lowered by 25-35%, and the electric rate of a power plant can be lowered by 1-1.5%; therefore, the fluidized bed boiler has remarkable energy-saving effect.
Description
Technical field
The utility model relates to CFBB, especially relates to a kind of low blast CFBB.
Background technology
China uses the maximum country of CFBB (being called for short the CFB boiler) in power plant in the world, the big or small recirculating fluidized bed station boiler that has moved has more than 3000, wherein the above large-size circulating fluidized bed station boiler of 410t/h has more than 140, and the above large-size circulating fluidized bed station boiler of 1025t/h has more than 20 (also having more than 50 builds).
CFBB furnace wall before lower furnace portion cone water-cooling wall in power station has been arranged tens secondary air channels (pipe) with the back furnace wall, and secondary wind provides oxygen and is used for the after-flame degree that overheavy firing improves coal particle; The bottom of cone is an air compartment, and a wind enters a bed of material by the blast cap of flowing through granular bed material is carried out fluidisation, and the result of fluidisation forms gas-solid two-phase fluidized state.Because existing tens secondary air channels (pipe) all connect from the big bellows of secondary, interface has produced bigger local resistance; The diameter of each secondary air channel is less and be that isometrical design also exists elbow to make that the resistance in secondary air channel road is very big simultaneously, and the overfire air fan outlet pressure is very big, causes the power consumption of overfire air fan high.The blast cap resistance of simultaneously existing fluidized-bed combustion boiler too big (4000-5000Pa) causes the primary air fan power consumption high.The dynamo-electric acc power summations of existing CFBB three strong wind (rated value) meet or exceed 6% of the specified generated energy of generating set, and this is that existing CFB boiler generating set station service power consumption rate is obviously than the reason place of the high point of pulverized-coal fired boiler generating set.So, be necessary to carry out reducing energy consumption research in each link of wind system comprehensively, reduce unburned carbon in flue dust and station service power consumption rate significantly, energy-saving and cost-reducing imperative.(annotate: the main at present two big type of furnaces of using in China power station are exactly CFBB and pulverized-coal fired boiler).Why so the highly energy-consuming of existing CFB boiler is because traditional design that introduction of foreign technology forms and traditional understanding and inappropriate operation are adjusted institute extremely.
The low blast CFBB of the utility model has outstanding energy-saving potential, after promoting, the whole nation can produce great economic benefit, simple analysis is as follows: more than 3000 the about generate output 80000MW of recirculating fluidized bed station boiler in the whole nation, it is exactly 800MW that station service power consumption rate exceeds 1 percentage point (generator power output 1%), promptly per hour waste 800,000 degree electric energy, annual (calculating in 6000 hours) waste 4,800,000,000 degree electric energy by annual unit operation generating! Be equivalent to about 1,640,000 tons of waste mark coal (coal consumption 342 gram/degree are on average marked in the national power plant by the issue of middle Electricity Federation), amount to 1,600,000,000 yuan of annual wastes approximately.
Summary of the invention
The utility model purpose is to provide a kind of low blast CFBB.Purpose is the highly energy-consuming problem that each link of solution CFBB wind system still exists.Low blast CFBB can make overfire air fan outlet blast at 8500-6500Pa, and primary air fan outlet blast is at 11000Pa-9000Pa; The blast cap resistance is adjusted to 25000-3000Pa; Can reduce blower motor energy consumption 25-35%, full power plant station service power consumption rate reduces 1-1.5 percentage point (1-1.5% of the specified generated energy of generator), and energy-saving effect is remarkable.
For achieving the above object, the utility model is taked following technical proposals:
Low blast CFBB described in the utility model, it comprises burner hearth, last secondary wind arm, following secondary wind arm, overfire air port, shunting platform, blast cap, bed material, an airduct, it is characterized in that: the shunting platform is set, enlarge overfire air port, secondary wind props up tube section in the change, secondary wind props up tube section under changing, and enlarges the spout of blast cap inner sleeve, changes the thickness of bed material.
Low blast CFBB described in the utility model, its outstanding feature has:
1, the upper and lower secondary wind arm of burner hearth and the cross section enlarge, realize convergent cross section from large to small.Reduce the local resistance of interface and the on-way resistance of arm, can reduce the secondary wind pressure like this, reduce the overfire air fan electrisity consumption.The very for a short time resistance of secondary wind that causes in the cross section of the secondary wind arm of existing CFB boiler is very big, and blast is higher, and the blower fan power consumption is bigger.
2, the cross section that enlarges overfire air port is to 160*360mm, the quantity to 20 of minimizing overfire air port.So just reduce the local resistance of interface, can reduce the secondary wind pressure, reduced the overfire air fan electrisity consumption.The cross section of the overfire air port of existing CFB boiler is 00*200mm mostly, causes the resistance of secondary wind very big, the most nearly 36 of the quantity of the overfire air port of existing CFB boiler, and the big resistance of air quantity is also big, and blast is higher, and the blower fan power consumption is bigger.
3, enlarge the opening diameter of blast cap inner sleeve, the resistance that reduces blast cap is to 2500-3000Pa.The tall and big 4500Pa of blast cap resistance of existing CFB boiler causes a blast higher, and the blower fan power consumption is bigger.
4, reduce the thickness of bed material to 450-550mm.Can reduce wind pressure one time, reduce the primary air fan electrisity consumption.The operations staff of existing CFB boiler custom will start bed and expect that thickness is added to 650mm even 800mm, cause wind pressure up to more than the 12000Pa, and the primary air fan power consumption is huge.
5, the length of prolongation secondary air channel spout inserts it into 500mm in the stove, on secondary wind top the shunting platform is set.The distribution that changes circulating ash quantity in the stove can reduce the back pressure of overfiren air port, and the adherent ash stream of shunting platform shunting is set on secondary wind top, can reduce the secondary wind pressure like this, reduces the overfire air fan electrisity consumption.The adherent grey flow resistance retaining secondary wind of existing CFB boiler internal cause makes the back pressure of overfiren air port bigger, and overfire air fan outlet blast is higher, and the blower fan power consumption is bigger.
6 are provided with discharging of outer circulation ash and cooling device, can control the burner hearth differential pressure at 600-800Pa, have reduced grey current density thereby reduction secondary wind back pressure in the burner hearth, and this is with just having reduced the overfire air fan electrisity consumption.
Advantage of the present utility model has been to abandon the way of the high blast of traditional CFBB, and low blast CFBB has a high potential aspect energy-conservation.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
The specific embodiment
As shown in the figure, low blast CFBB described in the utility model, it comprises the steps:
1. the cross section of the upper and lower secondary wind arm 2 of CFBB 1 and 3 is enlarged, method is the convergent cross section of adopting from large to small, reduce the local resistance of interface and the on-way resistance of arm, can reduce the secondary wind pressure like this, reduce the overfire air fan electrisity consumption.
2. the cross section that enlarges overfire air port 4 is to 160*360mm and reduce overfire air port 4 quantity to 20, has so just reduced the local resistance of interface, can reduce the secondary wind pressure, reduction overfire air fan electrisity consumption.
3. blast cap 6 resistances drop to 2500-3000Pa.
4. the thickness of bed material 7 drops to 450-550mm and can significantly reduce wind pressure one time, reduces the primary air fan electrisity consumption.
5. the distribution of the interior circulating ash quantity of change stove can reduce the back pressure of overfiren air port, method is that the length that prolongs secondary air channel spout 4 inserts it into 500mm in the stove, the adherent ash stream of shunting platform 5 shuntings is set on secondary wind top, can reduces the secondary wind pressure like this, reduce the overfire air fan electrisity consumption.
The various embodiments described above can not break away under the scope of the present utility model in addition some variations, thus above explanation comprises and accompanying drawing shown in structure should be considered as exemplary, but not in order to limit claim of the present utility model.
Claims (5)
1. one kind low blast CFBB, low blast CFBB described in the utility model, it comprises burner hearth (1), last secondary wind arm (2), following secondary wind arm (3), overfire air port (4), shunting platform (5), blast cap (6), bed material (7), an airduct (8) is characterized in that: shunting platform (5) is set, enlarges overfire air port (4), secondary wind arm (2) cross section in the change, change secondary wind arm (3) cross section down, enlarge the spout of blast cap (6), change the thickness of bed material (7).
2. low blast CFBB according to claim 1 is characterized in that: the cross section of the upper and lower secondary wind arm (2) of burner hearth (1) and (3) is enlarged, realize convergent cross section from large to small.
3. low blast CFBB according to claim 1 is characterized in that: the cross section that enlarges overfire air port (4) is to 160*360mm, the quantity to 20 of minimizing overfire air port (4).
4. low blast CFBB according to claim 1 is characterized in that: enlarge the opening diameter of blast cap (6) inner sleeve, the resistance that reduces blast cap (6) is to 2500-3000Pa.The thickness that reduces bed material (7) is to 450-550mm.
5. low blast CFBB according to claim 1 is characterized in that: the length that prolongs secondary air channel spout (4) inserts it into 500mm in the stove, and shunting platform (5) is set on secondary air channel spout (4) top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200624276U CN202024322U (en) | 2011-03-11 | 2011-03-11 | Low wind pressure circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200624276U CN202024322U (en) | 2011-03-11 | 2011-03-11 | Low wind pressure circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
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| CN202024322U true CN202024322U (en) | 2011-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200624276U Expired - Fee Related CN202024322U (en) | 2011-03-11 | 2011-03-11 | Low wind pressure circulating fluidized bed boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103075728A (en) * | 2013-02-04 | 2013-05-01 | 太原锅炉集团有限公司 | Flow-reconstruction based circulating fluidized bed boiler for controlling nitric oxide |
| CN110542080A (en) * | 2018-05-29 | 2019-12-06 | 中国电力工程顾问集团华北电力设计院有限公司 | Swirl injection device for embedded pipe of directly-upper secondary air furnace of CFB (circulating fluid bed) boiler |
| CN110542080B (en) * | 2018-05-29 | 2024-05-10 | 中国电力工程顾问集团华北电力设计院有限公司 | Built-in pipe rotational flow blowing device in overgrate air furnace directly above CFB boiler |
-
2011
- 2011-03-11 CN CN2011200624276U patent/CN202024322U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103075728A (en) * | 2013-02-04 | 2013-05-01 | 太原锅炉集团有限公司 | Flow-reconstruction based circulating fluidized bed boiler for controlling nitric oxide |
| CN110542080A (en) * | 2018-05-29 | 2019-12-06 | 中国电力工程顾问集团华北电力设计院有限公司 | Swirl injection device for embedded pipe of directly-upper secondary air furnace of CFB (circulating fluid bed) boiler |
| CN110542080B (en) * | 2018-05-29 | 2024-05-10 | 中国电力工程顾问集团华北电力设计院有限公司 | Built-in pipe rotational flow blowing device in overgrate air furnace directly above CFB boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Zhang Quansheng Document name: Notification of Termination of Patent Right |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111102 Termination date: 20130311 |