CN102777894B - Reverse powder injection combustor - Google Patents

Reverse powder injection combustor Download PDF

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Publication number
CN102777894B
CN102777894B CN201210168445.1A CN201210168445A CN102777894B CN 102777894 B CN102777894 B CN 102777894B CN 201210168445 A CN201210168445 A CN 201210168445A CN 102777894 B CN102777894 B CN 102777894B
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China
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air
rotating
heater
ring
type
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CN201210168445.1A
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Chinese (zh)
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CN102777894A (en
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李延新
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李延新
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Abstract

The invention discloses a reverse powder injection coal dust combustor, which comprises a high-temperature-resistant furnace body with a hearth, wherein a primary powder feed air inlet is formed at a central position on the top of the high-temperature-resistant furnace body; the bottom wall of the hearth is provided with a secondary rotary air supply port; the middle lower part of the side part of the hearth is provided with a ternary rotary air supply port; the upper part of the side part of the hearth is provided with a fire outlet; the side part of the hearth is provided with a quarternary rotary air supply port at the same height on one side corresponding to the fire outlet; a quinary rotary air supply port is formed around the fire outlet; and the secondary rotary air supply port, the ternary rotary air supply port, the quarternary rotary air supply port and the quinary rotary air supply port are communicated with a blower through air ducts. The reverse powder injection coal dust combustor has the advantages that the residence time of coal dust at a high-temperature region in a furnace is greatly prolonged, the requirement of oxidation reduction time of different-quality coal dust can be met, full combustion can be guaranteed at a relatively low furnace temperature, and the requirements of energy conservation and environmental protection are met.

Description

A kind of reverse powder injection combustor

Technical field

The present invention relates to a kind of burner for pulverized coal, particularly relate to a kind of reverse powder injection combustor.

Background technology

In today that world petroleum resource is day by day nervous, fuel cost is more and more higher.Compare with oil firing, burn coal and not only significantly can reduce fuel cost, meanwhile, because the coal reserves of China enriches, therefore burning coal can reduce the dependence to petroleum resources, meets the energy policy of China.So coal burner has larger application market and prospect in China.

When coal dust is heated to about 300 DEG C, the fugitive constituent in coal starts to separate out and burns, and after fugitive constituent is discharged, the after-flame of residual carbon component just needs very high temperature and longer redox reaction time.Because the quality difference of coal dust is very large, for larger pulverized coal particle and the lower coal dust of fugitive constituent, the time of staying extending coal dust high-temperature region in stove is just most important.

Existing coal burner as shown in Figure 2, the direct of travel of coal dust in stove is identical with the emission direction of flame, and this combustion system is forward combustion system.Because the wind speed in stove is higher, be all tens meter per seconds usually, most pulverized coal particle time of staying of high-temperature region in stove is approximately 0. 1 seconds.Therefore, existing coal burner has strict requirement to the fugitive constituent of coal dust and fineness.Not only the adjustable range of flame is narrower, and easily cutoff, combustion instability, and exhaust emissions is also difficult to up to standard, also common unburnt coal dust in dust-removal cloth-bag, thus it is lower to result in per unit area yield coal consumption efficiency of combustion that is comparatively large, coal dust.

In addition, because limiting by the volume of stove cylinder, the temperature in stove must be very high, and this has increased the weight of again the generation of slag and the discharge of nitrogen oxide.In addition, because the control of existing coal burner is relatively simple, temperature departure is comparatively large, and burning quality is difficult to ensure, therefore, in a lot of major project, existing coal burner is disabled.

Therefore, in high-end devices market, be badly in need of that a kind of flame adjustable range is wide, burning completely and stable, do not choose coal, the not only energy-conservation but also high-performance burner for pulverized coal of environmental protection.

Summary of the invention

The present invention aims to provide a kind of reverse powder injection combustor, to solve, existing burner for pulverized coal is higher to coal dust requirement, burning quality is lower, narrow, the easy generation cinder of flame adjustable range and the shorter problem of refractory life, thus realize the target that combustor does not choose coal, meet the demand of various production occasion.

The object of the invention is to be realized by following technical proposals:

A kind of reverse powder injection combustor, comprise one with the high temperature resistant body of heater of burner hearth, the top center position of described high temperature resistant body of heater is provided with a pulverizer air entrance, the bottom of described body of heater is provided with ring-type secondary rotating air outlet, the middle part of described body of heater is provided with three rotary supply outlets, the top of described body of heater sidepiece is provided with crater, described body of heater sidepiece At The Height corresponding with described crater is provided with four rotary supply outlets, surrounding place around described crater is provided with five rotary supply outlets, described ring-type secondary rotating air outlet, three rotary supply outlets, four rotary supply outlets, five times rotary supply outlet is connected with air blast by air channel.

Preferably, the differing heights place of described burner hearth sidepiece is provided with at least one temperature thermocouple.

Preferably, described ring-type secondary rotating air outlet has one group of ring-type rotary supply outlet at least, on the center line being centrally located at described bottom of furnace body of described ring-type secondary rotating air outlet, the shape of the rotary wind that the air-out formation that described ring-type secondary rotating air outlet is arranged to meet described ring-type secondary rotating air outlet is upwards flowed around burner hearth.

Preferably, described four rotary supply outlets are arranged to meet the shape of air-out direction with the direction that fires of described crater.

Beneficial effect of the present invention: combustor of the present invention have employed reverse the dust combustion system different from existing coal burner, namely coal dust to spray into direction contrary with the trend of gas in stove, substantially increase the time of staying of coal dust high-temperature region in stove, burning quality can be improved under the prerequisite of not choosing coal and wider flame adjustable range, realize the not only energy-conservation but also target of environmental protection.

Accompanying drawing explanation

Fig. 1 is the structural representation of reverse powder injection combustor of the present invention;

Fig. 2 is the structural representation of existing burner for pulverized coal.

In figure:

1, powder feeding air-supply entrance; 2, ring-type secondary rotating air outlet; 3, three rotary supply outlets; 4, four rotary supply outlets; 5, high temperature resistant body of heater; 6, air blast; 7, crater; 8, five oxygenating air outlets; 9, temperature thermocouple; 10, air channel.

Detailed description of the invention

Referring to accompanying drawing 1-2, in conjunction with concrete embodiment, the present invention is further illustrated.

The reverse powder injection combustor of one of the present invention, comprise one with the high temperature resistant body of heater 5 of burner hearth, the top center position of described high temperature resistant body of heater 5 is provided with a pulverizer air entrance 1, the bottom of described body of heater 5 is provided with ring-type secondary rotating air outlet 2, the middle part of described body of heater 5 sidepiece is provided with three rotary supply outlets 3, the top of described body of heater 5 is provided with crater 7, described body of heater 5 is provided with four rotary supply outlets 4 at the co-altitude place corresponding with described crater 7, surrounding place around described crater is provided with five rotary supply outlets 8, described secondary rotating air outlet 2, three rotary supply outlets 3, four rotary supply outlets 4, five times air outlet 8 is connected with an air blast 6 by air channel 10.As in Fig. 1, described ring-type secondary rotating air outlet 2 can be arranged on the diapire of body of heater 5, described three rotary supply outlets 3 are arranged on the position of the general middle height of sidewall of described body of heater 5, described crater 7 is arranged on the top of described body of heater 5 sidewall, arranges four rotary supply outlets 4 with on the sidewall of this crater 7 position opposite position.Described burner hearth is formed by described sidewall, diapire.

Preferably, what a described pulverizer air entrance 1 was arranged to meet coal dust sprays into direction with the contrary shape of the flow direction of gas in described body of heater.

Preferably, the differing heights place of described burner hearth is provided with at least one temperature thermocouple 9.

Preferably, described ring-type secondary rotating air outlet 2 has one group of ring-type rotary supply outlet at least, on the center line being centrally located at described bottom of furnace body of described ring-type secondary rotating air outlet 2, the shape of the rotary wind that the air-out formation that described ring-type secondary rotating air outlet 2 is arranged to meet described ring-type secondary rotating air outlet 2 is upwards flowed around burner hearth.The advantage of such setting is, the air-out of described ring-type secondary rotating air outlet 2 forms the rotary wind upwards flowed around burner hearth.

Described three rotary supply outlets 3 are arranged to meet the shape that air-out direction is spiral rotating rising obliquely, and the tertiary air that described three air outlets 3 are sent is providing comburant oxygen and accelerating in stove while gas rotating, also can control the temperature in the middle part of burner hearth.In one embodiment, the radial direction in direction and described body of heater that the shape of described three rotary supply outlets 3 is arranged to air port has angle, and points to a described pulverizer air entrance 1.

Described five air outlets 5 are arranged to meet the air-out direction shape identical with the direction that fires of described crater, and five wind that described five air outlets 5 are sent provide burning oxygen for a large amount of carbon monoxide for spraying in stove, and are fire door cooling.

Described four rotary supply outlets 4 are arranged to meet the air-out direction shape identical with the direction that fires of described crater.

The operation principle of combustor of the present invention is as shown in Figure 1: body of heater adopts vertical or horizontal type structure, the First air of coal dust and powder feeding sprays into from the pulverizer air entrance 1 being positioned at furnace roof central authorities, burner hearth center lowers the temperature due to the heat absorption of coal dust and First air, and coal dust is then heated rapidly and wraps up in the bottom arriving burner hearth with flame.

Secondary Air is rotating from the secondary ring-type rotary supply outlet 2 being positioned at bottom of furnace body and upwards blows, and the coal dust that arrival bottom takes fire upwards is blown afloat, and coal dust is in the combustion-supporting lower accelerated combustion of Secondary Air.

In order to control the temperature in stove, added the tertiary air of rotation by three rotary supply outlets 3 be positioned in the middle part of body of heater, the coal dust upwards rotated with the wind is near hearth combustion, and the coal dust that high-temperature burner hearth comes up to bottom again simultaneously provides the high-temperature field of burning indispensability.Because the crater of body of heater is in the side of body of heater, relatively uniform for what ensure to jet out flames, by four wind of four the rotary supply outlet 4 access control flame directions and temperature that are positioned at body of heater crater 7 equal altitudes.

In stove, the total amount of one two three four wind should lower than theory for oxygen value (coefficient of excess air≤1), turn increase five wind by five the oxygenating air outlets 8 be positioned at around the surrounding place of crater 7 at crater place for this reason, thus reaching just right result: a large amount of carbon monoxide is injected into boiler or kiln with a small amount of unburnt coal dust together with flame, and in stove final after-flame, simultaneously five wind also can be fire door cooling.

Be not difficult to find out from Fig. 1 and above-mentioned operation principle:

1. reverse dusting not only increases the stroke of coal dust in stove, also can be upper of furnace body cooling simultaneously, and the high-temperature gas of body of heater central authorities is moved down fast, also set up higher warm field at burner hearth bottom.

2., due to the reaction of burner hearth updraft, when the kinetic energy that coal dust is downward disappears or arrives bottom, coal dust has of short duration pause in the bottom of burner hearth.

3. the ratio shared by Secondary Air is little, and burner hearth bottom wind speed is upwards relatively low, and therefore the coal dust initial stage up speed that moves upward is relatively low.

Above-mentioned three factors all extend the time of staying of coal dust in high-temperature region, provide the comparatively well-to-do redox reaction time, thus realize cold operation to the after burning of coal dust.In order to rationally monitor furnace temperature, in the middle part of the bottom of body of heater, multiple temperature thermocouple can be settled with top, suitably can adjust the proportioning of each wind according to the temperature of different parts in stove.By changing air distribution and the proportionate relationship of each section, guarantee that in stove, each section of temperature controls at 800-1000 DEG C of (different coal dust quality temperature is different) section operation as far as possible, be conducive to the formation reducing cinder and nitrogen oxide, the service life of body of heater and kiln interface can also be extended simultaneously.

In order to ensure the adjustment ratio of flame 1:10 and level and smooth control characteristic, multiple frequency converter can be adopted to control powder feeding spiral respectively, for powder blower fan and each air distribution.When flame is 10% aperture, the revolution of all motors is all lower.Otherwise flame is adjusted 100% time, and the revolution of all motors is all in high value.Guarantee that complete machine is in the large-scale flame adjustment process of 1:10, remains desirable coefficient of excess air; Guarantee that the coal dust of different quality all can be in stable good fired state.

In sum: the reverse burner for pulverized coal that dusts of the present invention is compared with existing burner for pulverized coal, there is obvious excellent characteristic, not only can smooth combustion, coal dust cost can also be reduced and " eat coarse food grain ", also there is energy-conserving and environment-protective, long-lived superior quality simultaneously.

Combustor of the present invention have employed reverse the dust combustion system different from existing combustor, namely coal dust to spray into direction contrary with the trend of gas in stove.Be not difficult to find out by Fig. 1: the stroke of coal dust in stove is approximately two times of existing coal burner.As less relative to floor space in adopted vertical structure, suitably can strengthen diameter and the length of body of heater, therefore coal dust should be at least more than three times of existing coal-powder boiler in the time of staying of high-temperature region, obviously can improve the rigors of existing coal burner to coal dust fugitive constituent and fineness, " coarse food grain can be eaten ".And the adjustable range of flame can be made greatly to increase, reach 1:10.Because coal dust has the longer redox reaction time in stove, furnace temperature can be reduced and run, therefore can reduce the generation of slag, reduce the trouble of existing coal-powder boiler scarfing cinder, the discharge of tail gas nitrogen oxide can also be reduced thus more meet environmental requirement.If the diameter of stove and length are enough large, when furnace bottom wind speed is very low, the extravagant hope using face coal (particle diameter≤1mm) and coal dust inferior (not choosing coal) also can be made to become possibility, significantly reduce processing and the purchase cost of coal dust.

Because the present invention is described in detail with reference to preferred embodiment, the various modification of therefore making the present invention and replacement, all should be considered as not departing from the spirit and right that limit in the claims in the present invention.

Claims (5)

1. a reverse powder injection combustor, comprise one with the high temperature resistant body of heater of burner hearth, the top center position of described high temperature resistant body of heater is provided with a pulverizer air entrance, the bottom of described body of heater is provided with ring-type secondary rotating air outlet, the middle and lower part of described body of heater sidepiece is provided with three rotary supply outlets, the top of described body of heater sidepiece is provided with crater, the described body of heater sidepiece At The Height corresponding with described crater is provided with four rotary supply outlets, surrounding place around described crater is provided with five air outlets, described ring-type secondary rotating air outlet, three rotary supply outlets, four rotary supply outlets, five times air outlet is connected with air blast by tubular air channel,
Described ring-type secondary rotating air outlet has one group of ring-type rotary supply outlet at least, on the center line being centrally located at described bottom of furnace body of described ring-type secondary rotating air outlet, the shape of the rotary wind that the air-out formation that described ring-type secondary rotating air outlet is arranged to meet described ring-type secondary rotating air outlet is upwards flowed around burner hearth, the coal dust arriving bottom is rotating and blows afloat by described ring-type secondary rotating wind while providing comburant oxygen;
Described three rotary supply outlets are arranged to meet the shape that air-out direction is spiral rotating rising obliquely, and the tertiary air that described three air outlets are sent is providing comburant oxygen and accelerating in stove while gas rotating, also controls the temperature in the middle part of burner hearth.
2. reverse powder injection combustor as described in claim 1, is characterized by: what a described pulverizer air entrance was arranged to meet coal dust sprays into direction with the contrary shape of the flow direction of gas in described body of heater.
3. the reverse powder injection combustor as described in claim 1 or 2, it is characterized in that: described five air outlets are arranged to meet the air-out direction shape identical with the direction that fires of described crater, five wind that described five air outlets are sent provide burning oxygen for a large amount of carbon monoxide for spraying in stove, and are fire door cooling.
4. the reverse powder injection combustor as described in claim 1 or 2, is characterized in that: the differing heights place of described burner hearth sidepiece is provided with at least one temperature thermocouple, provides by it foundation controlling furnace temperature.
5. reverse powder injection combustor as described in claim 4, is characterized in that: described four rotary supply outlets are arranged to meet the air-out direction shape identical with the direction that fires of described crater.
CN201210168445.1A 2012-05-28 2012-05-28 Reverse powder injection combustor CN102777894B (en)

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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102980194B (en) * 2012-11-29 2015-09-02 华南理工大学 A kind of low nitrogen of rubbish and Di bioxin fire grate incinerating method and device thereof
CN103148477B (en) * 2013-02-26 2015-09-23 李延新 One is threaded into powder formula burner for pulverized coal
CN103672868A (en) * 2013-12-13 2014-03-26 李延新 Numerical control pulverized coal gasification burner
CN103727526A (en) * 2013-12-23 2014-04-16 惠建军 Vertical bidirectional blast injected pulverized-coal combustion furnace
CN103851623B (en) * 2014-03-28 2017-03-15 李延新 A kind of combustor of pressure Hui Yan
CN104654280A (en) * 2015-02-09 2015-05-27 怀来蒂吉博纳科技有限公司 Hearth structure capable of realizing low-nitrogen burning and burning control method
CN104949127A (en) * 2015-05-27 2015-09-30 李延新 Single-furnace-body two-way-combustion low-nitrogen furnace profile
CN105258111B (en) * 2015-10-22 2017-07-25 太原理工大学 Porous wall wind couples the coal dust furnace of air classification
CN105402733A (en) * 2015-12-14 2016-03-16 鹤山市凤台菱精密铸造有限公司 Garbage incinerator

Citations (7)

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Publication number Priority date Publication date Assignee Title
US4075953A (en) * 1975-06-30 1978-02-28 Energy Products Of Idaho Low pollution incineration of solid waste
JPS5818007A (en) * 1981-07-24 1983-02-02 Babcock Hitachi Kk Combustor
JPS60200007A (en) * 1984-03-21 1985-10-09 Sumitomo Metal Ind Ltd Combustion of pulverized coal
RO114674B1 (en) * 1998-02-05 1999-06-30 Ladislau Attila Szopos Burner
CN201462815U (en) * 2009-07-08 2010-05-12 武汉奥杰科技发展有限责任公司 High-efficiency energy-conservation vertical moveable pulverized coal burner
CN201547756U (en) * 2009-07-29 2010-08-11 刘效洲 Petroleum coke powder burning power generation device replacing exhaust residual heat of gas turbine
CN202613426U (en) * 2012-05-28 2012-12-19 李延新 Reversed powder-injecting burner

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075953A (en) * 1975-06-30 1978-02-28 Energy Products Of Idaho Low pollution incineration of solid waste
JPS5818007A (en) * 1981-07-24 1983-02-02 Babcock Hitachi Kk Combustor
JPS60200007A (en) * 1984-03-21 1985-10-09 Sumitomo Metal Ind Ltd Combustion of pulverized coal
RO114674B1 (en) * 1998-02-05 1999-06-30 Ladislau Attila Szopos Burner
CN201462815U (en) * 2009-07-08 2010-05-12 武汉奥杰科技发展有限责任公司 High-efficiency energy-conservation vertical moveable pulverized coal burner
CN201547756U (en) * 2009-07-29 2010-08-11 刘效洲 Petroleum coke powder burning power generation device replacing exhaust residual heat of gas turbine
CN202613426U (en) * 2012-05-28 2012-12-19 李延新 Reversed powder-injecting burner

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