CN102221199A - Low wind pressure improved and operation method of recirculating fluidized bed boiler - Google Patents
Low wind pressure improved and operation method of recirculating fluidized bed boiler Download PDFInfo
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- CN102221199A CN102221199A CN 201110058036 CN201110058036A CN102221199A CN 102221199 A CN102221199 A CN 102221199A CN 201110058036 CN201110058036 CN 201110058036 CN 201110058036 A CN201110058036 A CN 201110058036A CN 102221199 A CN102221199 A CN 102221199A
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Abstract
The invention discloses a low wind pressure improved and operation method of a recirculating fluidized bed boiler, the operation method comprises a low wind pressure improved technology and a low wind pressure operation method, wherein, the low wind pressure improved technology comprises the following steps of: the cross section of a second wind branch pipe is expanded and gradually shrinks, the cross section of a second wind branch pipe expands and the quantity of a second wind nozzle is reduced, a small resistance type blast cap is adopted to reduce the thickness of a start-bed-material, the length of the second wind pipe nozzle is extended and inserted into a stove for 500mm or a distributary platform arranged on the upper part of second wind. The low wind pressure operation method comprises a control hearth differential pressure which is used for controlling hearth differential pressure to be, and the air quantity at one time to be not more than 1.2-1.3 times the critical fluidization air quantity. The invention has the advantages of banishing the tradition method of high wind pressure recirculating fluidized bed boiler, the low wind pressure thinking is used for guiding and operating adjustment, and technology improvement is performed on the fluidized bed boiler to realize notable energy-saving recirculating fluidized bed boiler by using the low wind pressure idea.
Description
Technical field
This relates to CFBB clearly, especially relates to a kind of low blast improvement technology and operation method of energy-conservation 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.
Summary of the invention
The object of the invention is to provide a kind of low blast of CFBB of low energy consumption to improve and operation method.Purpose is the highly energy-consuming problem that each link of solution CFBB wind system still exists.
The overfire air fan of CFBB outlet blast operates in about 10000Pa mostly at present, just belongs to high blast greater than 8500Pa, and in other words low blast improves and the operation method purpose will make overfire air fan outlet blast less than 8500Pa.The primary air fan of CFBB outlet blast operates in about 13000 Pa mostly at present, just belongs to high blast greater than 11000Pa, and in other words low blast improves and the operation method purpose will make primary air fan outlet blast less than 11000Pa.
For achieving the above object, the present invention takes following technical method:
1. improving one's methods of CFBB secondary wind arm is that the cross section enlarges the convergent cross section of promptly adopting from large to small, reduces the local resistance of interface and the on-way resistance of arm, can reduce the secondary wind pressure like this, reduces 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. be the total quantity (being advisable) that enlarges cross section (expanding 160*360mm to) and reduce overfire air port to improving one's methods of overfire air port with 20, so just reduced the local resistance of interface, can reduce the secondary wind pressure, 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 overfire air port of existing CFB boiler (100*200mm) is 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. be to change slight drag type (2500-3000Pa is advisable) blast cap into to reduce the thickness (450mm is advisable) that starts the bed material simultaneously to improving one's methods of blast cap, can significantly reduce wind pressure one time, reduce the primary air fan electrisity consumption.The blast cap resistance of existing CFB boiler is big (4500Pa), causes a blast higher, and the blower fan power consumption is bigger.The operations staff of existing CFB boiler custom will start bed material thickness and be added to 650mm even 800mm, cause wind pressure (often reaching more than the 12000Pa) greatly, and the primary air fan power consumption is bigger.
4. improving one's methods of circulating ash quantity (adherent ash stream) is to change the back pressure that its distribution can reduce overfiren air port in the control stove, method is that the length that prolongs the secondary air channel spout inserts it in the stove 500mm or the adherent ash stream of shunting platform shunting is set on secondary wind top, can reduce the secondary wind pressure like this, reduce the overfire air fan electrisity consumption.
The back pressure of the overfiren air port of existing CFB boiler big (because of adherent grey flow resistance retaining secondary wind), overfire air fan outlet blast is higher, and the blower fan power consumption is bigger.
5. with low blast thought guidance operation adjustment, operation method is can reduce grey current density thereby reduction secondary wind back pressure in the burner hearth when reducing outer circulation ash amount, reduces the overfire air fan electrisity consumption.Method is that control burner hearth differential pressure is advisable at 600-800Pa.
The outer circulation of existing CFB boiler ash amount big (people are accustomed to pursuing higher circulating ratio the burner hearth differential pressure are controlled at more than the 1200Pa) make that the back pressure of overfiren air port is bigger, secondary wind blast is higher, the blower fan power consumption is bigger.
6. adjust with low blast thought guidance operation, operation method is the flow that suitably reduces by a wind, and the 1.2-1.3 that primary air flow is no more than critical flow wind transmission amount in the time of at full capacity doubly; Can significantly reduce the primary air fan electrisity consumption.
The existing most CFB boiler 1.4-1.7 that primary air flow surpasses critical flow wind transmission amount at full capacity the time is (people are accustomed to pursuing higher primary air flow and prevent the fluidisation inequality) doubly, make primary air flow high, and one time the wind blast is higher, and the primary air fan power consumption is bigger.
The invention has the advantages that the traditional method of having abandoned high blast CFBB, adjust, fluidized-bed combustion boiler is carried out technological improvement to realize significantly energy-conservation CFBB with low blast thought with low blast thought guidance operation.
Description of drawings
Fig. 1 is a structural representation of the present invention.
The specific embodiment
As shown in the figure, the low blast of fluidized-bed combustion boiler of the present invention improves and operation method, and 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.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. enlarge the cross section (expanding 160*360mm to) of overfire air port 4 and reduce overfire air port 4 quantity (being advisable), so just reduced the local resistance of interface, can reduce the secondary wind pressure, reduce the overfire air fan electrisity consumption with 20.
The very for a short time resistance of secondary wind that causes in the cross section of the overfire air port of existing CFB boiler (100*200mm) is 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. blast cap 6 adopts slight drag type (2500-3000Pa is advisable) to reduce the thickness (450mm is advisable) of startup bed material 7 simultaneously, can significantly reduce wind pressure one time, reduces the primary air fan electrisity consumption.The blast cap resistance of existing CFB boiler is big (4500Pa), causes a blast higher, and the blower fan power consumption is bigger.The operations staff of existing CFB boiler custom will start bed material thickness and be added to 650mm even 800mm, cause wind pressure (often reaching more than the 12000Pa) greatly, and the primary air fan power consumption is bigger.
4. the distribution of the interior circulating ash quantity of change stove (adherent ash stream) can reduce the back pressure of overfiren air port, method is that the length that prolongs secondary air channel spout 4 inserts it in the stove 500mm or the adherent ash stream of shunting platform 5 shuntings is set on secondary wind top, can reduce the secondary wind pressure like this, reduce the overfire air fan electrisity consumption.
The back pressure of the overfiren air port of existing CFB boiler big (because of adherent grey flow resistance retaining secondary wind), overfire air fan outlet blast is higher, and the blower fan power consumption is bigger.
5. implement low blast operation method and promptly be in operation and suitably adjust outer circulation ash amount and can reduce in the burner hearth grey current density thereby reduce secondary wind back pressure, reduce the overfire air fan electrisity consumption.Method is that control burner hearth differential pressure is advisable at 600-800Pa.
The outer circulation of existing CFB boiler ash amount big (people are accustomed to pursuing higher circulating ratio the burner hearth differential pressure are controlled at more than the 1200Pa) make that the back pressure of overfiren air port is bigger, secondary wind blast is higher, the blower fan power consumption is bigger.
6. implement low blast operation method and promptly be in operation and suitably reduce the air quantity of an airduct 8, the 1.2-1.3 that primary air flow is no more than critical flow wind transmission amount in the time of at full capacity doubly; Can significantly reduce the primary air fan electrisity consumption.
The existing most CFB boiler 1.4-1.7 that primary air flow surpasses critical flow wind transmission amount at full capacity the time is (people are accustomed to pursuing higher primary air flow and prevent the fluidisation inequality) doubly, make primary air flow high, and one time the wind blast is higher, and the primary air fan power consumption is bigger.
CFBB is implemented can make overfire air fan outlet blast at 8500-6500Pa behind low blast improvement and the operation method, and primary air fan outlet blast is at 11000Pa-9000Pa; The blast cap resistance selects 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.
The power-saving technology that the present invention gives prominence to can produce great economic benefit after promote in the whole nation, 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.
Claims (5)
1. the low blast improvement technology and the operation method of an energy-conservation CFBB is characterized in that: it comprises the steps:
The first step, the cross section of the upper and lower secondary wind arm (2) of CFBB (1) and (3) is enlarged, and method is the convergent cross section of adopting from large to small, reduces 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.
Second step enlarged the cross section (expanding 160*360mm to) of overfire air port (4) and reduced overfire air port (4) quantity (being advisable with 20), had so just reduced the local resistance of interface, can reduce the secondary wind pressure, reduced the overfire air fan electrisity consumption.
In the 3rd step, blast cap (6) adopts slight drag type (2500-3000 Pa is advisable) to reduce the thickness (450mm is advisable) that starts bed material (7) simultaneously, can reduce wind pressure one time, reduces the primary air fan electrisity consumption.
The 4th step, the distribution that changes circulating ash quantity in the stove (adherent ash stream) can reduce the back pressure of overfiren air port, method is that the length that prolongs secondary air channel spout (4) inserts it in the stove 500mm or the adherent ash stream of shunting platform (5) shunting is set on secondary wind top, can reduce the secondary wind pressure like this, reduce the overfire air fan electrisity consumption.
The 5th step, implement low blast operation method and promptly be in operation and suitably adjust outer circulation ash amount and can reduce in the burner hearth grey current density thereby reduce secondary wind back pressure, reduce the overfire air fan electrisity consumption.Method is that control burner hearth differential pressure is advisable at 600-800 Pa.
The 6th step, implement low blast operation method and promptly be in operation and suitably reduce the air quantity of an airduct (8) lining, the 1.2-1.3 that primary air flow is no more than critical flow wind transmission amount in the time of at full capacity is doubly; Can significantly reduce the primary air fan electrisity consumption.
2. the low blast of fluidized-bed combustion boiler according to claim 1 improves technology and operation method, it is characterized in that: the expansion of the cross section of described secondary wind arm, and this cross section is to be convergent from large to small.
3. the low blast of fluidized-bed combustion boiler according to claim 1 improves technology and operation method, and it is characterized in that: the cross section of described overfire air port expands 160*360mm to and reduces overfire air port quantity and be advisable with 20.
4. the low blast of fluidized-bed combustion boiler according to claim 1 improves technology and operation method, it is characterized in that: one of described low blast operation method promptly is that control burner hearth differential pressure is advisable at 600-800 Pa.
5. the low blast of fluidized-bed combustion boiler according to claim 1 improves technology and operation method, it is characterized in that: one of described low blast operation method promptly is to be in operation to adjust 1.2-1.3 that primary air flow is no more than critical flow wind transmission amount doubly.
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| CN 201110058036 CN102221199A (en) | 2011-03-11 | 2011-03-11 | Low wind pressure improved and operation method of recirculating fluidized bed boiler |
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| CN 201110058036 CN102221199A (en) | 2011-03-11 | 2011-03-11 | Low wind pressure improved and operation method of recirculating fluidized bed boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112664975A (en) * | 2020-12-30 | 2021-04-16 | 江苏海洋大学 | Air volume control method suitable for pulverized coal fired boiler |
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| JPH08145339A (en) * | 1994-11-22 | 1996-06-07 | Ishikawajima Harima Heavy Ind Co Ltd | Method and apparatus for controlling secondary air flow rate for combustion of coal fired boiler |
| CN1189886A (en) * | 1996-04-26 | 1998-08-05 | 日立造船株式会社 | Fluid bed type incinerator |
| CN101542202A (en) * | 2006-09-27 | 2009-09-23 | 巴布考克日立株式会社 | Burner, and combustion equipment and boiler comprising burner |
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2011
- 2011-03-11 CN CN 201110058036 patent/CN102221199A/en active Pending
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| US4579070A (en) * | 1985-03-01 | 1986-04-01 | The M. W. Kellogg Company | Reducing mode circulating fluid bed combustion |
| JPH08145339A (en) * | 1994-11-22 | 1996-06-07 | Ishikawajima Harima Heavy Ind Co Ltd | Method and apparatus for controlling secondary air flow rate for combustion of coal fired boiler |
| CN1189886A (en) * | 1996-04-26 | 1998-08-05 | 日立造船株式会社 | Fluid bed type incinerator |
| CN101542202A (en) * | 2006-09-27 | 2009-09-23 | 巴布考克日立株式会社 | Burner, and combustion equipment and boiler comprising burner |
| CN201582805U (en) * | 2010-01-05 | 2010-09-15 | 太原锅炉集团有限公司 | Biomass-energy circulating fluidized bed boiler with low energy consumption |
| CN201697119U (en) * | 2010-07-07 | 2011-01-05 | 樊起国 | Feeding device for adding coal slurry for burning of fluidized bed boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112664975A (en) * | 2020-12-30 | 2021-04-16 | 江苏海洋大学 | Air volume control method suitable for pulverized coal fired boiler |
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Application publication date: 20111019 |