CN201539856U - Central air supply device for boiler furnace of circulating fluidized bed - Google Patents
Central air supply device for boiler furnace of circulating fluidized bed Download PDFInfo
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- CN201539856U CN201539856U CN 200920033464 CN200920033464U CN201539856U CN 201539856 U CN201539856 U CN 201539856U CN 200920033464 CN200920033464 CN 200920033464 CN 200920033464 U CN200920033464 U CN 200920033464U CN 201539856 U CN201539856 U CN 201539856U
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Abstract
The utility model relates to a central air supply device for a boiler furnace of a circulating fluidized bed, which directly supplies air to the oxygen-poor areas in the center of the boiler furnace by arranging a dedicated central air supply device in the boiler furnace and can obviously improve the air supply situation of the center of the boiler furnace and improve the combustion efficiency of the boiler. The central air supply device for the boiler furnace of the circulating fluidized bed comprises an air distribution plate. The central air supply device is connected with the air distribution plate. One end of the central air supply device extends inside the boiler furnace, while the other end thereof is arranged inside or outside an air chamber 3 below the air distribution plate. When one end of the central air supply device is arranged outside the air chamber 3, the central air supply device is provided with a central air supply main pipe, and the air supply is primary air or secondary air. The central air supply device 1 extends into the boiler furnace with a distance of 0 to 10 meters to the air distribution plate. The top of the central air supply device is provided with one or more openings to form a top opening nozzle 6, the openings or the opening nozzle are round, square or polygonal, and the direction of the openings or the opening nozzle is horizontal, downward, upward or inclined.
Description
One, technical field:
The utility model relates to a kind of CFBB, especially relates to a kind of boiler hearth of circulating fluidized bed center air supply device.
Two, background technology:
The emulsion zone that mainly is divided into the bottom of flowing in the circulating fluid bed boiler flows and the dilute-phase zone on top flows, and lower furnace portion emulsion zone (awl section) is the main place that burning takes place, its air quantity feed the employing air stage feeding.One time wind is fed by the blast cap of arranging on it by the burner hearth bottom air distribution plate, plays fluidisation and burning air feed; Secondary wind feeds aftercombustion requisite oxygen amount by side wall surface spout around the lower furnace portion emulsion zone differing heights.Therefore, in time feeding of secondary wind influences very big to efficiency of combustion.
Along with the CFB boiler capacity increases, section of burner hearth increases thereupon, the overfire air port of sidewall layout can reach several meters to tens meters apart from the distance at burner hearth center all around, the secondary wind that overfire air port is fed is difficult to by spraying and diffusion arrival burner hearth central area, make the burner hearth central area be in the severe depletion of oxygen state, have oxygen-depleted zone (referring to Fig. 1).Experimental test proves, burner hearth center anaerobic condition ubiquity in the Large-scale CFB boiler.
Because burner hearth central area anoxic causes fuel combustion insufficient, particularly the boiler fly ash combustible increases, and has reduced boiler efficiency.
In order to improve large circulating fluidized bed boiler burner hearth center anoxic conditions, the general employing reduced furnace width, perhaps increase the measure of the penetration capacity (as improving distinguished and admirable speed of secondary or momentum of impinging jet etc.) of secondary wind, but these methods all are subjected to the restriction of factors such as structure, and effect is also very limited.China introduces ALSTOM company and adopts " pants " leg structure (referring to Fig. 2), lower furnace portion is divided into two, part secondary wind is fed by " pants " leg central authorities that make a slit or vent, and has reduced the distance of overfire air port apart from the burner hearth center, has significantly improved in the stove oxygen amount and has supplied with situation.But its complex structure, the manufacturing cost height, operational reliability is poor, and can bring new technical problems such as tilting table.
Three, utility model content:
The utility model is in order to solve the weak point in the above-mentioned background technology, a kind of boiler hearth of circulating fluidized bed center air supply device is provided, it is by being provided with the special center air supply device that gos deep in the burner hearth to the direct air feed of burner hearth center oxygen-depleted zone, can significantly improve burner hearth center air feed situation, improve boiler combustion efficiency.Simultaneously simple in structure, be applicable to the technological transformation of New-type boiler manufacturing and existing boiler.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of boiler hearth of circulating fluidized bed center air supply device is characterized in that: comprise the center air supply device 1 that is connected with air distribution plate, an end of center air supply device 1 stretches into burner hearth inside.
The other end of above-mentioned center air supply device 1 places the air compartment 3 of air distribution plate 2 belows inner or outside, and when an end of center air supply device 1 placed air compartment 3 outside, center air supply device 1 can be provided with the female pipe 4 of center air feed, and wind regime is wind or secondary wind.
Above-mentioned center air supply device 1 stretch in the stove apart from air distribution plate 2 highly be 0 meter to about 10 meters (identical when being 0 meter) in conventional blast cap height, air supply device top, center has one or more perforates to form top perforate spout 6, the shape of perforate or spout comprises circle or polygon, and the direction of perforate or spout comprises level, downwards, upwards or tilt.
Above-mentioned center air supply device 1 is provided with one or more sets in each boiler stove, when overlap is set more, the height of each air supply device equates or is unequal, center air supply device 1 end in burner hearth is communicated with each other or is not communicated with, or having a total air supply line 5 to connect a plurality of minutes air supply lines, each minute air supply line top perforate forms spout 6.
Above-mentioned center air supply device 1 its inner air circulation passage cross section and exterior cross-section shape comprise circle, polygon, and the inner air circulation cross section equivalent diameter minimum of center air supply device 1 is suitable with the blast cap size on the air distribution plate, and maximum can be to 4000 millimeters.
Vertical or tilt between above-mentioned center air supply device 1 and the air distribution plate 2, center air supply device 1 is distributed in one or more zones on air distribution plate 2, the shape of its distributed areas can be rectangle, circle, " worker " font, " returning " font, " O " font or " ◎ " font, the shape that also can loose is distributed between the common blast cap, the conventional blast cap of other area arrangements on the air distribution plate 2.
Above-mentioned center air supply device 1 side towards the fire is laid with abrasion-proof and refractory pouring material, or water stream channel is set in center air supply device 1 inside carries out the water flowing cooling.
Above-mentioned center air supply device 1 is made separately by boiler water-cooling heating surface, metal material or wearing-proof refractory material, or is composited by wall-cooling surface, metal and wearing-proof refractory material.
Compared with prior art, the advantage and the effect that the utlity model has are as follows:
The utility model is a kind of novel recirculating fluidized bed (CFB) boiler furnace central area air supply device, specifically be that the needed portion of air of fuel combustion is sent into the burner hearth central area by the aperture on the center air supply device that is connected with air distribution plate, increased the air feed air quantity of burner hearth central area, be used to change the zone oxygen concentration field distribution of burner hearth combustion centre, eliminate the phenomenon of burner hearth central area anoxic, improve the performance driving economy of boiler.Compare with " pants leg " structure of introducing ALSTOM company, adopt this technology after, boiler structure is simpler, makes to install more conveniently, boiler operatiopn is more stable, is applicable to the technological transformation of New-type boiler manufacturing and existing boiler.
Four, description of drawings:
Fig. 1 is the triangle oxygen-depleted zone schematic diagram of recirculating fluidized bed burner hearth central area;
Fig. 2 is a pants leg chamber structure schematic diagram;
Fig. 3 and Fig. 4 are the schematic diagram of center air supply device;
Fig. 5 and Fig. 6 are air supply device top, center and cooling, wearing-proof refractory material structural representation;
Fig. 7, Fig. 8 and Fig. 9 are center air supply device circulation of air cross section structure schematic diagram;
Figure 10 is the distributed areas figure of center air supply line on air distribution plate.
Among the figure, 1-center air supply device, 2-air distribution plate, 3-air compartment, the female pipe of 4-center air feed, 5-air supply line, 6-top perforate spout, 7-rectangular area, 8-border circular areas, 9-water outlet, 10-air intake, 11-secondary wind.
Five, the specific embodiment:
Traditional secondary wind air supply mode is that secondary wind air feed spout is arranged in around the burner hearth emulsion zone on the side wall surface, arranges on the burner hearth air distribution plate 2 that blast cap provides wind one time.Blast cap is close on the air distribution plate 2, and the percent opening of each regional blast cap generally also equates on the air distribution plate 2.Except that blast cap, there is not other pipeline or device on the air distribution plate 2 to burner hearth central area air feed.
The utility model proposes air quantity that partial combustion is needed first, from center air supply device 1 that air distribution plate 2 links to each other send into the burner hearth central area.By burner hearth of the present utility model central area air supply device, realization is to the direct air feed of burner hearth central area, having increased the required oxygen amount of burner hearth central area burning supplies with, improve the combustion atmosphere in burner hearth combustion centre zone, to directly improve the combustion reaction intensity of fuel, improve the burn-off rate of fuel.Center of the present utility model air supply method is: the center air supply device 1 that passes air distribution plate 2 by layout, make and to come from the air compartment 3 or air compartment 3 outer air upwards flow, be deep into the burner hearth center, air directly infeeded the burning oxygen deprivation zone of burner hearth center certain altitude.As shown in Figure 3 and Figure 4, an end of boiler hearth of circulating fluidized bed center air supply device 1 stretches into the inner certain altitude H of burner hearth, and the other end can place the air compartment 3 of air distribution plate 2 belows inner or outside.When an end of center air supply device 1 when air compartment 3 is inner, the wind of center air supply device 1 can directly come from a wind in the boiler air compartment, can not have the female pipe 4 of center air feed this moment; In the middle of the end in square airduct road 1 when placing air compartment 3 outside, the wind in the center air supply device 1 can come from the wind or the secondary wind of boiler, and air feed female pipe 4 in center can be set this moment.Center air supply device 1 stretches into certain altitude (being represented by distance air distribution plate 2 height H among Fig. 1) in the stove, and the concrete numerical value maximum of height H can reach about ten meters, and minimum can be 0 meter (promptly concordant with the blast cap on the air distribution plate); One or more perforates are arranged at the top of center air supply device 1, form spout (being top perforate spout 6) air is flowed out.The shape of perforate or spout is (to comprise circle, square and polygon etc.) arbitrarily.The direction of perforate or spout can be for level, downwards, upwards or with certain angle tilt.The similar center of one or more mutual structures air supply device 1 can be set in each boiler stove.Be provided with when a plurality of, the height H of each air supply device can equate, also can be unequal.The circulation passage cross section of center air supply device 1 inner air and exterior cross-section shape can be (to comprise circle, rectangle or polygon) arbitrarily.The inner air circulation cross section equivalent diameter of center air supply device 1, minimum can be suitable with the conventional blast cap size on the air distribution plate, and maximum can be hundreds of millimeter (even bigger).Center air supply device 1 is positioned at an end of burner hearth, can be communicated with each other, can not be communicated with yet, or have a total air supply line 5 to connect several minutes air supply lines, each minute the air supply line top again perforate form spout 6; Air supply device top, center concrete structure example is referring to Fig. 7 to Fig. 9.Center air supply device 1 and the angle that air distribution plate 2 forms can be vertical, also can tilt with certain angle.Center air supply device 1 can be made of separately wall-cooling surface, metal material or wearing-proof refractory material, also can be composited by wall-cooling surface, metal and wearing-proof refractory material.Center air supply device 1 is in the material of high temperature, high concentration; burn in order to prevent, wearing and tearing, distortion situation; air supply device 1 side towards the fire in center can lay abrasion-proof and refractory pouring material and carry out the abrasionproof refractory protection; also can design the current circulation passage, (referring to Fig. 5 to Fig. 6) protected in the water flowing cooling.The air feed of center air supply device 1 can also can perhaps be supplied with by ad hoc blower fan from the secondary wind of boiler from a wind of boiler.The distribution of center air supply device 1 on air distribution plate 2, can be distributed in one or more zones, the shape of its distributed areas can be a rectangle, it also can be other shape, as (referring to Figure 10) such as " worker " font, " O " font, " returning " font, " ◎ " fonts, the shape that also can loose is distributed between the common blast cap.Arrange on the air distribution plate 2 center air supply device 1 around arrange conventional blast cap.
Below in conjunction with accompanying drawing embodiment of the present utility model is further described.
Referring to Fig. 3 to Fig. 9, burner hearth of the present utility model center air supply device 1 mainly is made up of structures such as air supply line 5 and top perforate spout 6, the female pipes 4 of center air feed wind.Center air supply device 1 passes air distribution plate 2 by air compartment 3 and stretches into the burner hearth center, and a large amount of air is directly infeeded burner hearth central burner oxygen-depleted zone.There are one or more perforates on the top that center air supply device 1 stretches into burner hearth inside, forms spout (being top perforate spout 6) air is flowed out.The shape of perforate or spout is (to comprise circle, square and polygon etc.) arbitrarily.The direction of perforate or spout can be for level, downwards, upwards or with certain angle tilt.Concrete open-celled structure example is seen Fig. 5 and Fig. 6, and Fig. 5 is part (I portion) enlarged drawing of Fig. 3, and Fig. 6 is part (II portion) enlarged drawing of Fig. 4.Center air supply device 1 can be made of separately wall-cooling surface, metal material or wearing-proof refractory material, also can be composited by wall-cooling surface, metal and wearing-proof refractory material; Its height H that stretches into burner hearth inside can equate, also can be unequal; The inner air circulation cross section and the outer cross-sectional shape of center air supply device 1 can be (to comprise circle, rectangle or polygon) arbitrarily; Center air supply device 1 can form different angle [alpha] (comprising vertical or inclination) with air distribution plate 2; The air of center air supply device 1 can be from a wind of boiler, also can be from the secondary wind of boiler.Different center air supply devices 1 end in air compartment and in the burner hearth can be connected each other, also can not be connected.The distribution of center air supply device 1 on air distribution plate 2, can be distributed in one or more zones, the shape of its distributed areas can be a rectangle, also can be other shape, as " worker " font, " O " font, " returning " font, " ◎ " font etc., a distribution of can also loosing.
A kind of boiler hearth of circulating fluidized bed center air supply device comprises center air supply device 1, and center air supply device 1 comprises the female pipe 4 of air supply line 5, top perforate spout 6, air distribution plate 2, air compartment 3 and center air feed.The air supply line 5 of center air supply device 1 is the metal structure tubular structure, and the pipe outer wall is welded with pin, and in order to the abrasion-proof and refractory pouring material that fixedly lays, the cross sectional shape of inner air circulation is circular.Center air supply device 1 is provided with 4 covers altogether, stretches into the burner hearth center, and is equal apart from the height of air distribution plate 2, is 3 meters, with air distribution plate 2 mutual vertical (being that angle is 90 °).The end (top perforate spout 6) that center air supply device 1 is in the burner hearth center has equally distributed four circular spouts around the edge, and horizontal direction sprays in the burner hearth.Different center air supply devices 1 end in burner hearth is not connected each other.The other end of center air supply device 1 is outside air compartment 3.Manage 4 to each center air supply device 1 air feed by the center air feed is female.Air in the center air supply device 1 comes from boiler secondary air.4 center air supply devices 1 are positioned at the center of air distribution plate 2, and distributed areas are distributed rectangular, arrange conventional blast cap all around.
A kind of boiler hearth of circulating fluidized bed center air supply device comprises center air supply device 1, and center air supply device 1 comprises the female pipe 4 of air supply line 5, top perforate spout 6, air distribution plate 2, air compartment 3 and center air feed wind.The air supply line 5 of center air supply device 1 is the multi-layer metal structure tubular structure, forms water stream channel, and water flowing is cooled off.The pipe outer wall is welded with pin, and in order to the abrasion-proof and refractory pouring material that fixedly lays, metal tube inner air circulation cross sectional shape is circular.Center air supply device 1 is provided with 6 covers altogether, stretches into the burner hearth center, and wherein 4 covers are 3 meters (being positioned at the outside) apart from the height of air distribution plate 2, and two covers are 5 meters (being positioned at central authorities).Angle between each center air supply device 1 and the air distribution plate 2 is 90 °.The end (top perforate spout 6) that center air supply device 1 is in the burner hearth center has along 8 the circular spouts that evenly distribute all around, and the 45 ° of directions in oblique below spray in the burner hearth.Different center air supply devices 1 end in burner hearth is not connected each other.The other end of center air supply device 1 is outside air compartment 3.Manage 4 to each center air supply device 1 air feed by the center air feed is female.Air in the center air supply device 1 comes from wind of boiler.6 center air supply devices 1 are positioned at the central area of air distribution plate 2, and distributed areas are that " worker " shape distributes, and arrange conventional blast cap all around.
A kind of boiler hearth of circulating fluidized bed center air supply device comprises center air supply device 1, and center air supply device 1 comprises the female pipe 4 of air supply line 5, top perforate spout 6, air distribution plate 2, air compartment 3 and center air feed wind.The air supply line 5 of center air supply device 1 is the metal structure tubular structure, and the pipe outer wall is welded with pin, and in order to the abrasion-proof and refractory pouring material that fixedly lays, the cross sectional shape of inner air circulation is a rectangle, and the length of side is 400mm.Center air supply device 1 is provided with 1 cover altogether, stretches into the burner hearth center, is 5 meters apart from the height of air distribution plate 2,2 vertical with air distribution plate (be between them angle be 90 °).The end that center air supply device 1 is in the burner hearth center to around along continuous straight runs stretch out 4 and be in charge of, each divides tube end (top perforate spout 6) that 16 circular spouts are arranged, two arrange puts, and sprays in the burner hearth along the certain angle direction.The other end of center air supply device 1 is outside air compartment 3.Manage 4 to each center air supply device 1 air feed by the center air feed is female.Air in the center air supply device 1 comes from boiler secondary air.Center air supply device 1 is positioned at the center of air distribution plate 2, arranges conventional blast cap all around.
Embodiment 4
A kind of boiler hearth of circulating fluidized bed center air supply device comprises center air supply device 1, and center air supply device 1 comprises air supply line 5, top perforate spout 6, air distribution plate 2 and air compartment 3.The other end of center air supply device 1 is in air compartment 3 inside.The air supply line 5 of center air supply device 1 is the metal structure tubular structure, and the pipe outer wall is welded with pin, in order to the abrasion-proof and refractory pouring material that fixedly lays.The inner circulation of air cross sectional shape of pipe is circular.Center air supply device 1 is provided with 4 covers altogether, stretches into the burner hearth center, and is equal apart from the height of air distribution plate 2, is 3 meters.Angle between each center air supply device 1 and the air distribution plate 2 is 90 °.The end (top perforate spout 6) that center air supply device 1 is in the burner hearth center has along 8 the circular spouts that evenly distribute all around, and the 45 ° of directions in oblique top spray in the burner hearth.Each center air supply device 1 end in burner hearth is not connected each other.Air in the center air supply device 1 comes from wind of boiler.4 center air supply devices 1 shape that looses in four zones of air distribution plate 2 distributes, between line rectangular, between each center air supply device 1 and other area arrangements of air distribution plate 2 common blast cap is arranged.
A kind of boiler hearth of circulating fluidized bed center air supply device comprises center air supply device 1, and center air supply device 1 comprises air supply line 5, top perforate spout 6, air distribution plate 2 and air compartment 3.Center air supply device 1 is made by metal material, and inner air circulation cross sectional shape be a circle, and totally 200 of center air supply devices 1 are 0m apart from the height H of air distribution plate 2, and promptly the center air supply device is concordant with other blast cap on the air distribution plate.Air supply device 1 structure in center is similar on the air distribution plate 2 other blast cap of arranging, but the pitch of part-structure such as its diameter, top spout number of aperture and opening diameter and layout etc., can with common blast cap on the air distribution plate 2 difference to some extent.Angle between center air supply device 1 and the air distribution plate 2 is 90 °.Aperture on the center air supply device 1 is circular, and different center air supply devices 1 end in burner hearth is not connected each other.The other end of center air supply device 1 is in air compartment 3 inside.Air in the center air supply device 1 comes from wind of boiler.200 center air supply devices 1 are distributed in the central area on the air distribution plate 2, and distributed areas are shaped as " worker " shape, arrange conventional blast cap all around.
Claims (8)
1. boiler hearth of circulating fluidized bed center air supply device, it is characterized in that: comprise the center air supply device (1) that is connected with air distribution plate (2), an end of center air supply device (1) stretches into burner hearth inside.
2. a kind of boiler hearth of circulating fluidized bed according to claim 1 center air supply device, it is characterized in that: the other end of described center air supply device (1) places the air compartment (3) of air distribution plate (2) below inner or outside, when an end of center air supply device (1) places air compartment (3) outside, center air supply device (1) is provided with the female pipe of center air feed (4), and wind regime is wind or secondary wind.
3. a kind of boiler hearth of circulating fluidized bed according to claim 2 center air supply device, it is characterized in that: it highly is 0 meter to 10 meters apart from air distribution plate (2) that center air supply device (1) stretches into stove interior, air supply device top, center has one or more perforates to form top perforate spout (6), the shape of top perforate spout (6) comprises circle or polygon, and the direction of top perforate spout (6) comprises level, downwards, upwards or tilt.
4. a kind of boiler hearth of circulating fluidized bed according to claim 3 center air supply device, it is characterized in that: center air supply device (1) is provided with one or more sets in each boiler stove, when overlap is set more, the height of each air supply device equates or is unequal, center air supply device (1) end in burner hearth is communicated with each other or is not communicated with, or having a total air supply line (5) to connect a plurality of minutes air supply lines, each minute air supply line top perforate forms top perforate spout (6).
5. a kind of boiler hearth of circulating fluidized bed according to claim 4 center air supply device, it is characterized in that: center air supply device (1) inner air circulation passage cross section and exterior cross-section shape comprise circle or polygon, the inner air circulation cross section equivalent diameter minimum of center air supply device (1) is suitable with the blast cap size on the air distribution plate, is 4000 millimeters to the maximum.
6. a kind of boiler hearth of circulating fluidized bed according to claim 5 center air supply device, it is characterized in that: vertical or tilt between center air supply device (1) and the air distribution plate (2), center air supply device (1) is distributed in one or more zones on air distribution plate (2), its distributed areas be shaped as rectangle, circle, " worker " font, " returning " font, " O " font or " ◎ " font, the conventional blast cap of other area arrangements on the air distribution plate (2).
7. a kind of boiler hearth of circulating fluidized bed according to claim 6 center air supply device is characterized in that: center air supply device (1) side towards the fire is laid with abrasion-proof and refractory pouring material, or in center air supply device (1) inside water-cooled water stream channel is set.
8. a kind of boiler hearth of circulating fluidized bed according to claim 7 center air supply device, it is characterized in that: center air supply device (1) is made separately by boiler water-cooling heating surface, metal material or wearing-proof refractory material, or is composited by wall-cooling surface, metal and wearing-proof refractory material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200920033464 CN201539856U (en) | 2009-06-09 | 2009-06-09 | Central air supply device for boiler furnace of circulating fluidized bed |
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| CN 200920033464 CN201539856U (en) | 2009-06-09 | 2009-06-09 | Central air supply device for boiler furnace of circulating fluidized bed |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335305A (en) * | 2013-07-09 | 2013-10-02 | 东方电气集团东方锅炉股份有限公司 | Air distribution device of circulating fluidized bed boiler |
| CN103335306A (en) * | 2013-07-09 | 2013-10-02 | 东方电气集团东方锅炉股份有限公司 | Air distribution system and method of circulating fluidized bed boiler |
| CN103912871A (en) * | 2014-04-15 | 2014-07-09 | 国家电网公司 | Seal valve material returning system for chemical loop combustion system |
-
2009
- 2009-06-09 CN CN 200920033464 patent/CN201539856U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335305A (en) * | 2013-07-09 | 2013-10-02 | 东方电气集团东方锅炉股份有限公司 | Air distribution device of circulating fluidized bed boiler |
| CN103335306A (en) * | 2013-07-09 | 2013-10-02 | 东方电气集团东方锅炉股份有限公司 | Air distribution system and method of circulating fluidized bed boiler |
| CN103335305B (en) * | 2013-07-09 | 2016-03-30 | 东方电气集团东方锅炉股份有限公司 | A kind of air-distribution device of CFBB |
| CN103912871A (en) * | 2014-04-15 | 2014-07-09 | 国家电网公司 | Seal valve material returning system for chemical loop combustion system |
| CN103912871B (en) * | 2014-04-15 | 2016-03-16 | 国家电网公司 | For the seal valve revert system of burning chemistry chains system |
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