CN102607050A - Intermediate warehousing type air powder system - Google Patents
Intermediate warehousing type air powder system Download PDFInfo
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- CN102607050A CN102607050A CN2012100865036A CN201210086503A CN102607050A CN 102607050 A CN102607050 A CN 102607050A CN 2012100865036 A CN2012100865036 A CN 2012100865036A CN 201210086503 A CN201210086503 A CN 201210086503A CN 102607050 A CN102607050 A CN 102607050A
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- air
- pneumatic
- ejector
- coal dust
- wind
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- 239000000843 powder Substances 0.000 title claims abstract description 142
- 238000002485 combustion reaction Methods 0.000 claims abstract description 68
- 239000003245 coal Substances 0.000 claims abstract description 45
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000002817 coal dust Substances 0.000 claims description 102
- 239000007789 gas Substances 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 230000009469 supplementation Effects 0.000 abstract 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 8
- 238000010304 firing Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000008246 gaseous mixture Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 238000013316 zoning Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention discloses an intermediate warehousing type air powder system, which comprises a high-pressure air pump and an air powder mixer. A pulverized coal bin is connected with a feed inlet of the air powder mixer by a pulverized coal feeding machine, an outlet of the high-pressure air pump is connected with an air inlet of the air powder mixer, an air outlet of the air powder mixer is connected with a combustor of a combustion furnace, a pneumatic air ejector is further disposed between the high-pressure air pump and the combustor, pulverized coal is conveyed to the air powder mixer via the pulverized coal feeding machine, the high-pressure air pump delivers air to the air powder mixer, the pulverized coal is sucked and mixed in the air powder mixer to form primary air, and air required for sufficiently combusting the pulverized coal is supplemented by the pneumatic air ejector. The powder is conveyed by the high-pressure air pump, a certain quantity of air is sucked from the atmosphere or other air systems, multi-stage air supplementation required by the combustor is realized, the air required for sufficiently combusting the pulverized coal is supplied, and stable, high-efficiency and low-nitrogen pulverized coal combustion with a high burn-off rate and suppressed nitrogen oxide is realized.
Description
Technical field
The present invention relates to a kind of pulverized coal combustion system, be specifically related to a kind of middle warehouse formula wind powder system.
Background technology
Pulverized coal combustion helps realizing automation control because efficiency of combustion is high, is convenient to the reasons such as control of pollutant emission, is widely used in generating plant pulverized coal boiler, industrial coal powder boiler and rotary kiln.
The wind powder system that pulverized coal combustion adopted has two kinds of middle warehouse formula and direct-firing systems, and middle warehouse formula wind powder system is after raw coal is worn into coal dust, is put in the Pulverized Coal Bin in order to using; Direct-firing wind powder system is that raw coal is worn into coal dust in coal pulverizer, directly blows to coal powder burner to burn.
The nucleus equipment of pulverized coal combustion is a coal powder burner, burns in order to organize coal dust and airborne oxygen, in the combustion process of coal dust in boiler; A certain amount of coal dust firing needs corresponding air capacity, and air capacity generally is that segmentation is carried, and is called for short air stage feeding; Thereby assurance efficiency of combustion; The generation of control and reduction nitrogen oxide, air stage feeding can be a part of at burner, and a part is in the combustion chamber.
The wind powder system is used to coal powder burner and coal dust firing provides desired coal dust and air.
The following three kinds of modes of the general employing of warehouse formula wind powder system in the middle of existing:
Mode one:
As shown in Figure 1, coal dust is delivered to air and powder mixer 2 from Pulverized Coal Bin through the coal dust batcher; Primary air fan 1 is air and powder mixer 2 air-supply, with the coal dust suction and be mixed into and have the wind of certain wind powder than (be air with wherein the mass ratio of coal dust), directly delivers to burner 3, burns in order to organize coal dust and air.
The advantage of the middle warehouse formula wind powder system of this structure is: primary air fan 1 is centrifugal blower, and air quantity can satisfy the needs of coal dust firing, and is simple in structure; Shortcoming is: wind powder ratio is had requirement, and during the boiler load adjustment, powder-feeding amount and blower fan are exerted oneself and will be adjusted synchronously; Simultaneously, limit by fan pressure head and changes in flow rate relation institute, air is during through air and powder mixer 2, and suction force deficiency sometimes causes under the coal dust powder not smooth, obstruction etc.
Mode two:
As shown in Figure 2, coal dust is delivered to air and powder mixer 2 from Pulverized Coal Bin through the coal dust batcher; Primary air fan 1 is air and powder mixer 2 air-supply, with the coal dust suction and be mixed into wind one time, delivers to burner 3; Meanwhile, overfire air fan 4 to burner 3 feeding secondary wind, fully burns coal dust and air through volume adjusting apparatus 5; Burner 3 is a multicenter combustor, and wind and secondary wind get into the different passages of burner 3 respectively.
The characteristics of the middle warehouse formula wind powder system of this structure are: primary air fan 1 is high-pressure pump, and total head is far longer than centrifugal blower, adopts the concentrated phase Pneumatic Conveying Technology simultaneously, can guarantee that the coal dust course of conveying is smooth, avoids the pipeline accumulated powder; But, because primary air flow is not enough, need replenish air (secondary wind) through overfire air fan 4, volume adjusting apparatus 5 is used to adjust the air quantity of secondary wind.
Mode three:
As shown in Figure 3, coal dust is delivered to air and powder mixer 2 from Pulverized Coal Bin through the coal dust batcher; Primary air fan 1 is air and powder mixer 2 air-supply, with the coal dust suction and be mixed into wind one time, delivers to burner 3; Meanwhile, overfire air fan 4 provides secondary wind through volume adjusting apparatus 5, and secondary wind is delivered to burner through after the heating of air preheater, and coal dust and air are fully burnt; Burner 3 is a multicenter combustor, and wind and secondary wind get into the different passages of burner 3 respectively.
The characteristics of the middle warehouse formula wind powder system of this structure are: primary air fan 1 is high-pressure pump, and total head is far longer than centrifugal blower, adopts the concentrated phase Pneumatic Conveying Technology simultaneously, can guarantee that the coal dust course of conveying is smooth, avoids the pipeline accumulated powder; But, because primary air flow is not enough, need replenish air (secondary wind), the air quantity of volume adjusting apparatus 5 adjustment secondary wind through overfire air fan 4; Secondary wind is before getting into burner 3, and the heating through air preheater becomes hot secondary wind, can help the burning of burner 3 and the recovery of fume afterheat.
In sum, there is following shortcoming in prior art:
Mode one: wind powder ratio is had requirement, and during the boiler load adjustment, powder-feeding amount and blower fan are exerted oneself and will be adjusted synchronously; Simultaneously, limit by fan pressure head and changes in flow rate relation institute, air is during through air and powder mixer, suction force deficiency sometimes, cause under the coal dust powder not freely, obstruction etc.
Mode two and mode three: need to increase overfire air fan, system complex be inconvenient to increase the progression of air stage feeding, and the air quantity that is not easy to air stage feeding is adjusted.
Summary of the invention
Technical problem to be solved by this invention provides a kind of middle warehouse formula wind powder system, and it can guarantee that powder feeding is unimpeded, improves efficiency of combustion, helps reducing the generation of nitrogen oxide in the process of coal combustion.
For solving the problems of the technologies described above, the technical solution of warehouse formula wind powder system is in the middle of the present invention:
Comprise high-pressure pump, air and powder mixer, Pulverized Coal Bin connects the charging aperture of air and powder mixer through the coal dust batcher; The high pressure gas delivery side of pump connects the air inlet of air and powder mixer, and the air outlet of air and powder mixer connects the burner of combustion furnace; Also be provided with pneumatic air ejector between high-pressure pump and the burner; Coal dust is delivered to air and powder mixer from Pulverized Coal Bin through the coal dust batcher; High-pressure pump is the air and powder mixer air-supply, and coal dust is aspirated and in air and powder mixer, be mixed into one time wind; Pneumatic air ejector replenishes the coal dust required air quantity that fully burns.
Further, said air and powder mixer is connected with pneumatic air ejector; The air outlet of air and powder mixer connects the inlet of pneumatic air ejector, and the outlet of pneumatic air ejector connects said burner; Pneumatic air ejector is provided with first volume adjusting apparatus; Air and powder mixer is delivered to pneumatic air ejector with a wind; Pneumatic air ejector is a power with this wind, and suction is from the air of atmosphere, in order to replenish the coal dust required air quantity that fully burns; And wind and the air quantity that replenishes mixed; Form a new wind, directly deliver to burner, fully burn in order to organize coal dust and air.
Further, said first volume adjusting apparatus connects air preheater; Air preheater is arranged at the exhanst gas outlet of combustion furnace; Said pneumatic air ejector suction is through the air from atmosphere of air preheater heating; In order to replenishing the coal dust required air quantity that fully burns, and a wind is mixed with the air quantity that replenishes, form a new wind; Directly deliver to burner, fully burn in order to organize coal dust and air.
Perhaps, said air and powder mixer is parallelly connected with pneumatic air ejector; The inlet of pneumatic air ejector connects high-pressure pump, and the outlet of pneumatic air ejector connects burner through second volume adjusting apparatus; Pneumatic air ejector is provided with first volume adjusting apparatus; Burner is a multicenter combustor, gets into the different passages in the burner from wind of air and powder mixer respectively with secondary wind from pneumatic air ejector; Air and powder mixer is delivered to burner with a wind; The high-pressure blast that pneumatic air ejector of while is used to from high-pressure pump is a power; Suction from the air of atmosphere as secondary wind; In order to replenish the coal dust required air capacity of fully burning, regulate the secondary air flow that is replenished through first volume adjusting apparatus, coal dust and air are fully burnt.
Further, said first volume adjusting apparatus connects air preheater; Air preheater is arranged at the exhanst gas outlet of combustion furnace; Said pneumatic air ejector suction through the air preheater heating from the air of atmosphere as secondary wind; In order to replenish the coal dust required air quantity that fully burns; Regulate the secondary air flow that is replenished through first volume adjusting apparatus, coal dust and air are fully burnt.
Further, said high pressure gas delivery side of pump connects one or more air stage feeding branch roads simultaneously; Said air stage feeding branch road comprises the second pneumatic air ejector, and the high pressure gas delivery side of pump connects the inlet of the second pneumatic air ejector, and the outlet of the second pneumatic air ejector connects the combustion chamber of combustion furnace through the 4th volume adjusting apparatus; The second pneumatic air ejector is provided with the 3rd volume adjusting apparatus; The high-pressure blast that the said second pneumatic air ejector is used to from high-pressure pump is a power; The direct air of suction from atmosphere; Send into the combustion chamber and carry out the coal dust sectional combustion,, reduce the generation of nitrogen oxide in the combustion process in order to replenish the coal dust required air capacity of fully burning.
Further, said the 3rd volume adjusting apparatus connects air preheater; The said second pneumatic air ejector suction is through the air from atmosphere of air preheater heating.
The technique effect that the present invention can reach is:
The present invention adopts the high-pressure pump powder feeding, because the high pressure gas pump head is higher, through the high speed winds of high-pressure pump generation; Can in custom-designed device (being pneumatic air ejector), form negative pressure; From atmosphere or other wind systems, suck certain air quantity, form the needed multistage benefit wind of burner; Satisfy the coal dust needed air capacity of fully burning, thereby realize with stable, high burn-off rate, suppress efficient, the low nitrogen coal dust firing that nitrogen oxide is generated as purpose.
Pneumatic air ejector of the present invention utilizes the high-pressure pump source of the gas, and suction atmosphere or other wind regime can form the required multistage of coal dust firing and mend wind.
The present invention has concurrently and mends the wind function through the high-pressure pump powder feeding, can realize reliably, powder feeding is to coal powder burner glibly.
The present invention is simple and reliable for structure, reduces investment outlay and the place, and the air quantity of air zoning is easy to adjust, helps fully burning and reduces discharged nitrous oxides.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed explanation:
Fig. 1 is the sketch map of warehouse formula wind powder system in the middle of the prior art;
Fig. 2 is the sketch map of another kind of prior art;
Fig. 3 is the sketch map of the third prior art;
Fig. 4 is the sketch map of first embodiment of warehouse formula wind powder system in the middle of the present invention;
Fig. 5 is the sketch map of second embodiment of warehouse formula wind powder system in the middle of the present invention;
Fig. 6 is the sketch map of the 3rd embodiment of warehouse formula wind powder system in the middle of the present invention;
Fig. 7 is the sketch map of the 4th embodiment of warehouse formula wind powder system in the middle of the present invention;
Fig. 8 is the sketch map of the 5th to the 8th embodiment of warehouse formula wind powder system in the middle of the present invention.
Description of reference numerals among the figure:
1 is primary air fan, and 2 is air and powder mixer,
3 is burner, and 4 is overfire air fan,
5 is volume adjusting apparatus,
21 is high-pressure pump, and 24 is pneumatic air ejector,
25 is first volume adjusting apparatus, and 26 is second volume adjusting apparatus,
27 is the second pneumatic air ejector, and 28 is the 3rd volume adjusting apparatus,
29 is the 4th volume adjusting apparatus.
The specific embodiment
Be illustrated in figure 4 as first embodiment of the middle warehouse formula of the present invention wind powder system, comprise high-pressure pump 21, air and powder mixer 2, Pulverized Coal Bin connects the charging aperture of air and powder mixer 2 through the coal dust batcher; The outlet of high-pressure pump 21 connects the air inlet of air and powder mixer 2, and the air outlet of air and powder mixer 2 connects the inlet of pneumatic air ejector 24, and the outlet of pneumatic air ejector 24 connects the burner 3 of combustion furnace; Pneumatic air ejector 24 is provided with first volume adjusting apparatus 25;
Coal dust is delivered to air and powder mixer 2 from Pulverized Coal Bin through the coal dust batcher; High-pressure pump 21 is air and powder mixer 2 air-supplies, and coal dust is aspirated and be mixed into a wind (being high-pressure blast powder gaseous mixture fixed double phase flow); One time wind gets into pneumatic air ejector 24, and pneumatic air ejector 24 is a power with this wind, and suction is from the air of atmosphere, in order to replenish the coal dust required air quantity that fully burns; The air quantity that is replenished can be regulated through first volume adjusting apparatus 25;
Be illustrated in figure 5 as second embodiment of the middle warehouse formula of the present invention wind powder system, comprise high-pressure pump 21, air and powder mixer 2, Pulverized Coal Bin connects the charging aperture of air and powder mixer 2 through the coal dust batcher; The outlet of high-pressure pump 21 connects the air inlet of air and powder mixer 2, and the air outlet of air and powder mixer 2 connects the inlet of pneumatic air ejector 24, and the outlet of pneumatic air ejector 24 connects the burner 3 of combustion furnace; Pneumatic air ejector 24 is provided with first volume adjusting apparatus, 25, the first volume adjusting apparatus 25 and connects air preheater; Air preheater is arranged at the exhanst gas outlet of combustion furnace;
Coal dust is delivered to air and powder mixer 2 from Pulverized Coal Bin through the coal dust batcher; High-pressure pump 21 is air and powder mixer 2 air-supplies, and coal dust is aspirated and be mixed into a wind (being high-pressure blast powder gaseous mixture fixed double phase flow); One time wind gets into pneumatic air ejector 24, and pneumatic air ejector 24 is a power with this wind, and suction is through the air from atmosphere of air preheater heating, in order to replenish the coal dust required air quantity that fully burns; The air quantity that is replenished can be regulated through first volume adjusting apparatus 25;
Air preheater can improve the temperature of secondary wind, helps the burning of burner, and the recovery section flue gas heat, improves combustion furnace efficient.
Be illustrated in figure 6 as the 3rd embodiment of the middle warehouse formula of the present invention wind powder system, comprise high-pressure pump 21, air and powder mixer 2, Pulverized Coal Bin connects the charging aperture of air and powder mixer 2 through the coal dust batcher; The outlet of high-pressure pump 21 connects the air inlet of air and powder mixer 2, and the air outlet of air and powder mixer 2 connects the burner 3 of combustion furnace;
Air and powder mixer 2 is parallelly connected with pneumatic air ejector 24, and the inlet of pneumatic air ejector 24 connects high-pressure pump 21, and the outlet of pneumatic air ejector 24 connects burners 3 through second volume adjusting apparatus 26; Pneumatic air ejector 24 is provided with first volume adjusting apparatus 25; Burner 3 is a multicenter combustor, gets into the different passages in the burner 3 from wind of air and powder mixer 2 respectively with secondary wind from pneumatic air ejector 24.
Coal dust is delivered to air and powder mixer 2 from Pulverized Coal Bin through the coal dust batcher; High-pressure pump 21 is air and powder mixer 2 air-supply, with the coal dust suction and be mixed into wind one time, and a wind is delivered to burner 3; Meanwhile; The high-pressure blast that pneumatic air ejector 24 is used to from high-pressure pump 21 is a power; Suction from the air of atmosphere as secondary wind; In order to replenish the coal dust required air capacity of fully burning, the secondary air flow that is replenished can be regulated through first volume adjusting apparatus 25, and coal dust and air are fully burnt.Present embodiment can solve the problem of coal burner air stage feeding.
Be illustrated in figure 7 as the 4th embodiment of the middle warehouse formula of the present invention wind powder system, comprise high-pressure pump 21, air and powder mixer 2, Pulverized Coal Bin connects the charging aperture of air and powder mixer 2 through the coal dust batcher; The outlet of high-pressure pump 21 connects the air inlet of air and powder mixer 2, and the air outlet of air and powder mixer 2 connects the burner 3 of combustion furnace;
Air and powder mixer 2 is parallelly connected with pneumatic air ejector 24, and the inlet of pneumatic air ejector 24 connects high-pressure pump 21, and the outlet of pneumatic air ejector 24 connects burners 3 through second volume adjusting apparatus 26; Pneumatic air ejector 24 is provided with first volume adjusting apparatus, 25, the first volume adjusting apparatus 25 and connects air preheater; Air preheater is arranged at the exhanst gas outlet of combustion furnace;
Coal dust is delivered to air and powder mixer 2 from Pulverized Coal Bin through the coal dust batcher; High-pressure pump 21 is air and powder mixer 2 air-supply, with the coal dust suction and be mixed into wind one time, and a wind is delivered to burner 3; Meanwhile; The high-pressure blast that pneumatic air ejector 24 is used to from high-pressure pump 21 is a power; Suction through air preheater heating from the air of atmosphere as secondary wind; In order to replenish the coal dust required air capacity of fully burning, the secondary air flow that is replenished can be regulated through first volume adjusting apparatus 25, and coal dust and air are fully burnt.
Air preheater can improve the temperature of secondary wind, helps the burning of coal burner, and the recovery section flue gas heat, improves efficiency of combustion.
Present embodiment can solve the problem of coal burner air stage feeding and flue gas waste heat recovery.
As shown in Figure 8, when the original system among the figure was first embodiment, the 5th embodiment for warehouse formula wind powder system in the middle of the present invention comprised high-pressure pump 21, air and powder mixer 2, and Pulverized Coal Bin connects the charging aperture of air and powder mixer 2 through the coal dust batcher; The outlet of high-pressure pump 21 connects the air inlet of air and powder mixer 2, and the air outlet of air and powder mixer 2 connects the inlet of pneumatic air ejector 24, and the outlet of pneumatic air ejector 24 connects the burner 3 of combustion furnace; Pneumatic air ejector 24 is provided with first volume adjusting apparatus 25;
The outlet of high-pressure pump 21 connects one or more air stage feeding branch roads simultaneously;
As shown in Figure 8, the air stage feeding branch road comprises the second pneumatic air ejector 27, and the outlet of high-pressure pump 21 connects the inlet of the second pneumatic air ejector 27, and the outlet of the second pneumatic air ejector 27 connects the combustion chamber of combustion furnace through the 4th volume adjusting apparatus 29; The second pneumatic air ejector 27 is provided with the 3rd volume adjusting apparatus 28;
The 3rd volume adjusting apparatus 28 can connect air preheater, as the sixth embodiment of the present invention; Air preheater is arranged at the exhanst gas outlet of combustion furnace.
Coal dust is delivered to air and powder mixer 2 from Pulverized Coal Bin through the coal dust batcher; High-pressure pump 21 is air and powder mixer 2 air-supplies, and coal dust is aspirated and be mixed into a wind (being high-pressure blast powder gaseous mixture fixed double phase flow); One time wind gets into pneumatic air ejector 24, and pneumatic air ejector 24 is a power with this wind, and suction is from the air of atmosphere, in order to replenish the coal dust required air quantity that fully burns; The air quantity that is replenished can be regulated through first volume adjusting apparatus 25; Pneumatic air ejector 24 mixes wind and additional air quantity, forms a new wind with the required wind powder ratio of combustion furnace, directly delivers to burner 3, burns in order to organize coal dust and air;
Meanwhile; The high-pressure blast that the second pneumatic air ejector 27 is used to from high-pressure pump 21 is a power, and suction is perhaps passed through the air from atmosphere of air preheater heating directly from the air of atmosphere; Send into the combustion chamber of combustion furnace and carry out the coal dust sectional combustion; In order to replenish the coal dust required air capacity of fully burning, reduce the generation of nitrogen oxide in the combustion process, the air quantity that is replenished can be regulated through the 3rd volume adjusting apparatus 28.
As shown in Figure 8, when the original system among the figure was the 3rd embodiment, the 7th embodiment for warehouse formula wind powder system in the middle of the present invention comprised high-pressure pump 21, air and powder mixer 2, and Pulverized Coal Bin connects the charging aperture of air and powder mixer 2 through the coal dust batcher; The outlet of high-pressure pump 21 connects the air inlet of air and powder mixer 2, and the air outlet of air and powder mixer 2 connects the burner 3 of combustion furnace;
Air and powder mixer 2 is parallelly connected with pneumatic air ejector 24, and the inlet of pneumatic air ejector 24 connects high-pressure pump 21, and the outlet of pneumatic air ejector 24 connects burners 3 through second volume adjusting apparatus 26; Pneumatic air ejector 24 is provided with first volume adjusting apparatus 25; Burner 3 is a multicenter combustor, gets into the different passages in the burner 3 from wind of air and powder mixer 2 respectively with secondary wind from pneumatic air ejector 24;
The outlet of high-pressure pump 21 connects one or more air stage feeding branch roads simultaneously;
As shown in Figure 8, the air stage feeding branch road comprises the second pneumatic air ejector 27, and the outlet of high-pressure pump 21 connects the inlet of the second pneumatic air ejector 27, and the outlet of the second pneumatic air ejector 27 connects the combustion chamber of combustion furnace through the 4th volume adjusting apparatus 29; The second pneumatic air ejector 27 is provided with the 3rd volume adjusting apparatus 28;
The 3rd volume adjusting apparatus 28 can connect air preheater, as the eighth embodiment of the present invention; Air preheater is arranged at the exhanst gas outlet of combustion furnace.
Coal dust is delivered to air and powder mixer 2 from Pulverized Coal Bin through the coal dust batcher; High-pressure pump 21 is air and powder mixer 2 air-supply, with the coal dust suction and be mixed into wind one time, and a wind is delivered to burner 3; Simultaneously; The high-pressure blast that pneumatic air ejector 24 is used to from high-pressure pump 21 is a power; Suction is directly from the air of atmosphere, perhaps through the air preheater heating from the air of atmosphere as secondary wind, in order to replenish the coal dust required air capacity of fully burning; The secondary air flow that is replenished can be regulated through first volume adjusting apparatus 25, and coal dust and air are fully burnt;
Meanwhile; The high-pressure blast that the second pneumatic air ejector 27 is used to from high-pressure pump 21 is a power, and suction is perhaps passed through the air from atmosphere of air preheater heating directly from the air of atmosphere; Send into the combustion chamber of combustion furnace and carry out the coal dust sectional combustion; In order to replenish the coal dust required air capacity of fully burning, reduce the generation of nitrogen oxide in the combustion process, the air quantity that is replenished can be regulated through the 3rd volume adjusting apparatus 28.
In embodiments of the invention five to embodiment eight; Coal dust is sent into air through segmentation in combustion process, can realize that coal dust burns stage by stage; Except in burner 3, carrying out sectional combustion; Also in the combustion chamber of combustion furnace, carry out sectional combustion, thereby can reduce the generation of nitrogen oxide, reduce and pollute.
When the outlet of high-pressure pump 21 connects a plurality of air stage feeding branch road simultaneously (increasing the quantity of pneumatic air ejector 27), a plurality of air stage feeding branch roads are parallel with one another, can increase to the number of times of combustion chamber air zoning.
Claims (9)
1. warehouse formula wind powder system in the middle of a kind, it is characterized in that: comprise high-pressure pump, air and powder mixer, Pulverized Coal Bin connects the charging aperture of air and powder mixer through the coal dust batcher; High-pressure pump connects air and powder mixer, and air and powder mixer connects the burner of combustion furnace; Also be provided with pneumatic air ejector between high-pressure pump and the burner;
Coal dust is delivered to air and powder mixer from Pulverized Coal Bin through the coal dust batcher; High-pressure pump is the air and powder mixer air-supply, and coal dust is aspirated and in air and powder mixer, be mixed into one time wind; Pneumatic air ejector replenishes the coal dust required air quantity that fully burns.
2. warehouse formula wind powder system in the middle of according to claim 1, it is characterized in that: said air and powder mixer is connected with pneumatic air ejector; The air outlet of air and powder mixer connects the inlet of pneumatic air ejector, and the outlet of pneumatic air ejector connects said burner; Pneumatic air ejector is provided with first volume adjusting apparatus;
Air and powder mixer is delivered to pneumatic air ejector with a wind; Pneumatic air ejector is a power with this wind, and suction is from the air of atmosphere, in order to replenish the coal dust required air quantity that fully burns; And wind and the air quantity that replenishes mixed; Form a new wind, directly deliver to burner, fully burn in order to organize coal dust and air.
3. warehouse formula wind powder system in the middle of according to claim 2, it is characterized in that: said first volume adjusting apparatus connects air preheater; Air preheater is arranged at the exhanst gas outlet of combustion furnace;
Said pneumatic air ejector suction is through the air from atmosphere of air preheater heating; In order to replenishing the coal dust required air quantity that fully burns, and a wind is mixed with the air quantity that replenishes, form a new wind; Directly deliver to burner, fully burn in order to organize coal dust and air.
4. warehouse formula wind powder system in the middle of according to claim 1, it is characterized in that: said air and powder mixer is parallelly connected with pneumatic air ejector; The inlet of pneumatic air ejector connects high-pressure pump, and the outlet of pneumatic air ejector connects burner through second volume adjusting apparatus; Pneumatic air ejector is provided with first volume adjusting apparatus; Burner is a multicenter combustor, gets into the different passages in the burner from wind of air and powder mixer respectively with secondary wind from pneumatic air ejector;
Air and powder mixer is delivered to burner with a wind; The high-pressure blast that pneumatic air ejector of while is used to from high-pressure pump is a power; Suction from the air of atmosphere as secondary wind; In order to replenish the coal dust required air capacity of fully burning, regulate the secondary air flow that is replenished through first volume adjusting apparatus, coal dust and air are fully burnt.
5. warehouse formula wind powder system in the middle of according to claim 4, it is characterized in that: said first volume adjusting apparatus connects air preheater; Air preheater is arranged at the exhanst gas outlet of combustion furnace;
Said pneumatic air ejector suction is through the air from atmosphere of air preheater heating, in order to replenish the coal dust required air quantity that fully burns, regulates the secondary air flow that is replenished through first volume adjusting apparatus, and coal dust and air are fully burnt.
6. warehouse formula wind powder system in the middle of according to claim 2, it is characterized in that: said high pressure gas delivery side of pump connects one or more air stage feeding branch roads simultaneously;
Said air stage feeding branch road comprises the second pneumatic air ejector, and the high pressure gas delivery side of pump connects the inlet of the second pneumatic air ejector, and the outlet of the second pneumatic air ejector connects the combustion chamber of combustion furnace through the 4th volume adjusting apparatus; The second pneumatic air ejector is provided with the 3rd volume adjusting apparatus;
The high-pressure blast that the said second pneumatic air ejector is used to from high-pressure pump is a power; The direct air of suction from atmosphere; Send into the combustion chamber of combustion furnace and carry out the coal dust sectional combustion,, reduce the generation of nitrogen oxide in the combustion process in order to replenish the coal dust required air capacity of fully burning.
7. according to claim 3 or 6 described middle warehouse formula wind powder systems, it is characterized in that: said the 3rd volume adjusting apparatus connects air preheater; The said second pneumatic air ejector suction is through the air from atmosphere of air preheater heating.
8. warehouse formula wind powder system in the middle of according to claim 4, it is characterized in that: said high pressure gas delivery side of pump connects one or more air stage feeding branch roads simultaneously;
Said air stage feeding branch road comprises the second pneumatic air ejector, and the high pressure gas delivery side of pump connects the inlet of the second pneumatic air ejector, and the outlet of the second pneumatic air ejector connects the combustion chamber of combustion furnace through the 4th volume adjusting apparatus; The second pneumatic air ejector is provided with the 3rd volume adjusting apparatus;
The high-pressure blast that the said second pneumatic air ejector is used to from high-pressure pump is a power; The direct air of suction from atmosphere; Send into the combustion chamber of combustion furnace and carry out the coal dust sectional combustion,, reduce the generation of nitrogen oxide in the combustion process in order to replenish the coal dust required air capacity of fully burning.
9. according to claim 5 or 8 described middle warehouse formula wind powder systems, it is characterized in that: said the 3rd volume adjusting apparatus connects air preheater; The said second pneumatic air ejector suction is through the air from atmosphere of air preheater heating.
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| CN201210086503.6A CN102607050B (en) | 2012-03-28 | 2012-03-28 | Intermediate warehousing type air powder system |
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| CN201210086503.6A CN102607050B (en) | 2012-03-28 | 2012-03-28 | Intermediate warehousing type air powder system |
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| CN102607050B CN102607050B (en) | 2014-02-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103672947A (en) * | 2012-09-06 | 2014-03-26 | 中国石油化工股份有限公司 | Dense-phase powder feeding and burning system for boiler |
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