CN100516651C - W flame boiler primary air waste-steam replacement method and apparatus for - Google Patents
W flame boiler primary air waste-steam replacement method and apparatus for Download PDFInfo
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- CN100516651C CN100516651C CNB2007101778161A CN200710177816A CN100516651C CN 100516651 C CN100516651 C CN 100516651C CN B2007101778161 A CNB2007101778161 A CN B2007101778161A CN 200710177816 A CN200710177816 A CN 200710177816A CN 100516651 C CN100516651 C CN 100516651C
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Abstract
The invention relates to a replacement method of primary air blast gas of a W flame boiler. The invention cuts off a primary air blast pipe of a coal powder inflamer on a front crown and a back crown of the existing W flame boiler, cancels a blast gas that is communicated with a combustion chamber and downwards shoots between 5 and 30 percent of the gross of the secondary air to the combustion chamber with an angle of ranging from 0 degree to 60 degrees to the vertical direction at a speed of 10 - 50m/s by making use of the position of a spout of the original primary air blast gas. The replacement method of primary air blast gas of W flame boiler is to insert a secondary air pipe on the position of the spout of the original primary air blast gas of the coal powder inflamer. Compared with the prior art, the invention has the advantages of (1) being able to remove the unreasonableness of the exiting equiblast mode of the existing W flame boiler; (2) being capable of improving the stability of the flame of the coal powder airflow, increasing the flame stroke, intensifying the supplying and mixing of the oxygen amount in later period of combustion and reducing the carbon content of flying ash, etc; (3) making fully use of the original combustion system structure and being extremely suitable for the technical improvement of the existing W flame boiler.
Description
Technical field
The present invention relates to weary gas method of replacement of wind of a kind of W flame boiler and device, belong to W type flame boiler field of combustion technology.
Background technology
China is one of abundant country of the less anthracite reserves of number, nearly 1,200 hundred million tons of its proved reserves in the world.But because anthracitic volatile content is lower, fugitive constituent is separated out the temperature height, causes the breeze airflow difficulty of catching fire, and combustion instability is difficult for after-flame, causes that mechanical incomplete combustion increases in the boiler operatiopn, and boiler efficiency is lower.For improving the safety in operation and the economy of low reaction ability coal boilers such as burning anthracite, China has introduced the U.S. FW-W of FW company type flame boiler combustion technology in the later stage eighties 20th century.Simultaneously domestic Dongfang Boiler Factory is by introducing and digestion U.S. FW company technology, designs many FW-W type flame boilers and begins to put goods on the market, and as above pacifies 3, No. 4 units of power plant, 1, No. 2 units of Yangquan, Shanxi power plant.
The structure of FW-W type flame boiler is different with conventional coal-burning boiler, and it comprises the combustion chamber of boiler body bottom, the secondary furnace and the coal burner on boiler body top; The depth ratio secondary furnace of described combustion chamber is big, and the top of front, combustion chamber ledge constitutes chimney arch, described coal burner is installed on the chimney arch, the breeze airflow of following spray catches fire, and the back is downward stretches, turn back upwards in the middle and lower part of combustion chamber, along rising on the axis, combustion chamber, thereby form W type flame, imperfect combustion product rises with flue gas stream and enters secondary furnace and burn away.
The FW-W type flame boiler of Dongfang Boiler Factory and U.S. FW company all adopts cyclone separating pulverized coal bias combustion device, and this burner stagger arrangement is arranged on two arches of front-back wall.One time the wind breeze airflow tangentially enters two cyclone separating burners arranged side by side simultaneously, and under action of centrifugal force, a large amount of pulverized coal particles are thrown to the separator outer wall, thereby have improved the coal powder density of penetrating main breeze airflow under the burner nozzle, help catching fire.Contain the less weary gas of powder and drawn at the cyclone separator core, the weary gas that the cyclone separator central tube is drawn is sent into burner hearth near the burner hearth centre on arch.Chimney arch portion sends into a spot of secondary wind, and in order to cooled nozzle and the oxygen demand that the burning initial stage is provided, a large amount of secondary wind divides three grades of levels evenly to send into from front-back wall, to realize anthracitic classification oxygen supply and burning.
But in actual motion, especially under the service condition of high load capacity, it is poor that the FW-W type flame boiler combustion technology of Dongfang Boiler Factory and U.S. FW company exposes the breeze airflow flame holding, and furnace outlet oxygen amount is on the low side, the unburned carbon in flue dust height, the problem of the less economical grade of burning.
The burning economy of FW-W type flame boiler under high load capacity is relatively poor, traces it to its cause to have a very confidential relation with air supply mode is unreasonable.According to design philosophy and the operation principle of FW, have only a certain proportion of a small amount of secondary wind on the arch, the required most secondary wind of combustion system are sent into the combustion chamber from the front-back wall horizontal slice of chimney arch bottom, and wherein about about 65% secondary wind is sent into from F layer spout.; the secondary wind that the front-back wall horizontal slice is sent into is all at the back-fire side of breeze airflow; the air-supply on simultaneously corresponding chimney arch top seldom; cause the side oxygenating condition of waring oneself in front of a fire of breeze airflow relatively poor; cause air and breeze airflow relatively poor in the mixing in the later stage of catching fire; the stability of final influence burning and the after-flame of coal dust, therefore, this air supply mode exists tangible irrationality.
In actual motion, because pulverized coal particle is thicker, for the stability that keeps burning, secondary wind on the chimney arch is not thrown basically, be in closed condition, make the warm oneself in front of a fire oxygenating condition of side of breeze airflow become poorer, this shows on the designed arch of FW that it is inappropriate that secondary wind adds the implantation site, and irrational contradiction of blowing is very outstanding.
Show from a large amount of operation practices, under high load capacity, to open weary gas wind and can not improve combustion position, opposite combustion position often worsens, therefore at present all basically FW-W type flame boilers are in operation and all will lack gas wind and close, and weary gas blowout mouth is in useless state.This phenomenon contradicts with design philosophy and operation instruction principle that FW company provides, trace it to its cause, mainly by following some cause:
1, air curtain effect.Weary gas wind contains a certain amount of coal powder density, can be strong stop the radiant heat transfer of high-temperature flue gas to a wind breeze airflow, greatly reduce the caloric receptivity of main breeze airflow.
2, coal dust cyclone separator separating effect is undesirable.According to the mentality of designing of FW, the size of weary gas wind should be corresponding the height of coal powder density of a wind primary air and the size of wind speed.Because coal dust cyclone separator separating effect is undesirable, thin pulverized coal particle can not separate, along with weary gas enters burner hearth; The fineness of pulverized coal particle and concentration are the key factors that breeze airflow catches fire, and along with the increasing that lacks the gas air quantity, thicker, concentration reduction that the average fineness of the pulverized coal particle of primary air becomes, this has worsened catching fire of primary air and steady combustion condition more.
3, the primary air jet stroke is not enough.Lack gas wind and strengthen, one time wind primary air prompt drop is low, and the air-flow rigidity reduces, and the penetration depth and the stroke of primary air fall short of, and it is not enough with the amount of entrainmenting the elevated temperature heat flue gas to cause primary air to absorb radiation of burner hearth heat, thereby causes the breeze airflow flammability not good.
Summary of the invention
First technical problem that the present invention will solve provides the weary gas method of replacement of wind of a kind of W flame boiler.
Another technical problem that the present invention will solve provides the weary gas displacement apparatus of wind of a kind of W flame boiler.
For solving above-mentioned first technical problem, wind of a kind of W flame boiler of the present invention lacks the gas method of replacement: a wind blast pipe of the coal burner on the chimney arch before and after the existing W flame boiler is disconnected, and the weary gas wind of combustion chamber is led in cancellation; Utilize the spout and the position of the weary gas of original wind, with secondary wind total amount 5%～30% to inject the combustion chamber downwards in vertical direction with 0 °～60 ° angle and the speed of 10～50m/s.
Wind of a kind of W flame boiler of the present invention lacks the gas method of replacement, and this method is replaced into secondary wind by the weary gas of a wind that will have the W flame boiler now, can eliminate the irrationality of original air supply mode.Main cause is as follows:
1) replenishing of the secondary air flow of the side of waring oneself in front of a fire of increase breeze airflow can be improved the side oxygenating condition of waring oneself in front of a fire, and strengthens the mixing and the combustion intensity of the oxygen amount of the side of waring oneself in front of a fire.
2) amount of the secondary wind of the back-fire side of minimizing breeze airflow, can reduce breeze airflow in the air capacity of catching fire and sneaking in early days, improve the temperature levels of fire area, strengthen the entrainment mixing of breeze airflow, reach and catch fire in advance and the effect of stable breeze airflow flame high-temperature flue gas.
3) the weary gas wind of cancellation though increased the air velocity of main burner coal dust spout, has reduced coal powder density, has also correspondingly increased the content of fine powder in the main breeze airflow, and this is to the reduction institute's energy requirement that catches fire, and it is very favourable to catch fire ahead of time.
4) the weary gas wind of cancellation, correspondingly increased the rigidity of the breeze airflow flame of main burner coal dust spout, increased the penetration depth of air-flow, prolonged the stroke of pulverized coal flame, improved the time of staying of pulverized coal particle in stove, improved the after-flame degree of pulverized coal particle, very favourable to reducing unburned carbon in flue dust.
For solving above-mentioned second technical problem, wind of a kind of W flame boiler of the present invention lacks the gas displacement apparatus, it comprises the combustion chamber of boiler body bottom, the secondary furnace and the coal burner on boiler body top, the depth ratio secondary furnace of described combustion chamber is big, the top of front, combustion chamber ledge constitutes chimney arch, and described coal burner is arranged on the chimney arch; In the weary gas blowout mouth position of a former wind of described coal burner, insert secondary wind airduct, what introduce in this airduct is a part of secondary wind of W type flame boiler.
As improvement of the technical scheme, described coal burner is a cyclone separating pulverized coal bias combustion device.
As improvement of the technical scheme, described secondary wind airduct is provided with valve, in order to regulate the intake of secondary wind.
As improvement of the technical scheme, the front end of described secondary wind airduct tilts to the burner hearth centerline direction, in vertical direction with 0 °～60 ° angle.
As improvement of the technical scheme, be provided with sealing flange between described secondary wind airduct and the chimney arch.
At present, all basically W flame boilers are in operation and all will lack gas wind and close, and weary gas blowout mouth is in useless state.Therefore, utilize the spout and the position of the weary gas of an existing wind to send into secondary wind, can avoid because the perforate destruction to water wall structure of causing again.In a weary gas blowout mouth of wind, newly insert a secondary air channel, and the front end of airduct can play the effect of the angle of secondary wind air quantity, secondary wind wind speed and the secondary wind of controlling and regulate adding to the inclination of burner hearth center position.Because the difference of the design parameter of every W flame boiler, burning coal, operational factor, the incident angle of secondary wind air quantity, secondary wind wind speed and secondary wind that the weary gas blowout mouth of the wind in corresponding arch, back in the past adds all should be different to some extent, its concrete numerical value should be determined according to the actual conditions of boiler, reaches best running status to guarantee boiler.
The present invention compared with prior art has the following advantages:
1) can eliminate the irrationality of original W flame boiler air supply mode;
2) can improve the stability of breeze airflow flame, increase flame travel, the replenishing and mix reduction unburned carbon in flue dust etc. of overheavy firing later stage oxygen amount;
3) make full use of original combustion system structure, be very suitable for technological transformation existing FW-W type flame boiler.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail
Fig. 1 is the combustion system structural representation of existing W type flame boiler;
Fig. 2 is the weary gas displacement apparatus structural representation of a wind of W type flame boiler of the present invention;
Fig. 3 is the A portion partial enlarged drawing among Fig. 2.
The specific embodiment
Shown in Fig. 2,3,
Wind of a kind of W flame boiler of the present invention lacks the gas method of replacement: a wind blast pipe 31 of the cyclone separating pulverized coal bias combustion device 3 on the chimney arch 10 before and after the existing W flame boiler is disconnected, and the weary gas airduct of combustion chamber is led in cancellation; Utilize the spout 32 and the position of the weary gas of original wind, with secondary wind total amount 5%～30% from this position to inject the combustion chamber downwards in vertical direction with 0 °～60 ° angle and the speed of 10～50m/s.
Wind of a kind of W flame boiler of the present invention lacks the gas displacement apparatus, it comprises the combustion chamber 1 of boiler body bottom, the secondary furnace 2 and the cyclone separating pulverized coal bias combustion device 3 on boiler body top, the depth ratio secondary furnace 2 of described combustion chamber 1 is big, the top of combustion chamber 1 front ledge constitutes chimney arch 10, described cyclone separating pulverized coal bias combustion device 3 is arranged on the chimney arch 10, and is connected with a wind wind powder pipe 4 and communicates; Described blast pipe 31 of drawing at the central tube of cyclone separating pulverized coal bias combustion device 3 is provided with closure plate 311, has stoped the backflow of weary gas; On chimney arch 10, be provided with annular secondary air box 5, be provided with secondary windshield plate 51 in the secondary air channel road 50 between annular secondary air box 5 and chimney arch 10; Set firmly the female pipe 6 of secondary wind in secondary furnace 2 outsides, the female pipe of secondary wind 6 the left and right sides and annular secondary air box 5 UNICOMs at burner hearth, the female pipe 6 of this secondary wind is fixing by suspension rod 61 and support 62; In weary gas blowout mouth 32 positions of a former wind of described cyclone separating pulverized coal bias combustion device 3, insert secondary wind airduct 33, introduce a part of secondary wind in this airduct 33 from the W flame boiler of the female pipe 6 of secondary wind.
Referring to shown in Figure 2, further improved embodiment, described secondary wind airduct 33 is provided with valve 331, in order to regulate the intake of secondary wind.
Shown in Fig. 2,3, further improved embodiment, the front end of described secondary wind airduct 33 tilts to the burner hearth centerline direction, can become 0 °～60 ° angle with vertical direction, is 10 ° in the present embodiment.
Referring to shown in Figure 2, further improved embodiment is provided with sealing flange 332 between described secondary wind airduct 33 and the chimney arch 10.
In test run, the W type flame boiler of certain 350MW of power plant has 48 cyclone separating pulverized coal bias combustion devices 3 on the chimney arch 10 before and after it.Each cyclone separating pulverized coal bias combustion device 3 is all disconnected its wind blast pipe road 31, the weary gas wind of combustion chamber is led in cancellation, and in former weary gas blowout mouth 32, insert a new secondary wind airduct 33, the front end of secondary wind airduct 33 tilts to the burner hearth centerline direction, in vertical direction with 10 ° angle; 10% of secondary air flow is sent into combustion chamber 2 from the secondary air channel 33 that increases newly, and its wind speed is 10m/s.According to boiler design and operational factor, the operating condition after the weary gas displacement of wind of analog computation, draw: the unburned carbon in flue dust of boiler has descended 15%, does not throw oily smooth combustion load and brings up to 315MW from 300MW; When secondary air flow is increased to 30% from 5%, the front end vertical direction of secondary wind airduct becomes 60 ° angle, and when secondary wind wind speed was 50m/s, the unburned carbon in flue dust of boiler had descended 75%, did not throw oily smooth combustion load and brought up to 350MW from 320MW.
In actual motion, should according to coal, load, combustion position and other subsidiary conditions to the secondary wind that should replace air quantity, speed that secondary wind sprays into the combustion chamber and angle is adjusted and finally determine, thereby reach the best stabilized combustion position and reduce the effect of unburned carbon in flue dust.
Obviously, the above embodiment of the present invention only is for example of the present invention clearly is described, and is not to be qualification to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here can't give exhaustive to all embodiments.Everyly belong to the row that conspicuous variation that technical scheme of the present invention extends out or change still are in protection scope of the present invention.
Claims (5)
1, the weary gas method of replacement of wind of a kind of W flame boiler, it is characterized in that: a wind blast pipe of the coal burner on the chimney arch before and after the existing W flame boiler is disconnected, and the weary gas airduct of combustion chamber is led in cancellation; Utilize the spout and the position of the weary gas of original wind, with secondary wind total amount 5%～30% to tilt to the burner hearth centerline direction and, to inject the combustion chamber downwards with the speed of 10～50m/s in vertical direction with 0 °～60 ° angle.
2, the weary gas displacement apparatus of wind of a kind of W flame boiler, it comprises the combustion chamber of boiler body bottom, the secondary furnace and the coal burner on boiler body top, the depth ratio secondary furnace of described combustion chamber is big, the top of front, combustion chamber ledge constitutes chimney arch, and described coal burner is arranged on the chimney arch; It is characterized in that: in the weary gas blowout mouth position of a former wind of described coal burner, insert secondary wind airduct, the front end of this secondary wind airduct tilts to the burner hearth centerline direction, in vertical direction with 0 °～60 ° angle.
3, the weary gas displacement apparatus of wind of a kind of W flame boiler according to claim 2, it is characterized in that: described coal burner is a cyclone separating pulverized coal bias combustion device.
4, according to claim 2 or the weary gas displacement apparatus of wind of 3 described a kind of W flame boilers, it is characterized in that: described secondary wind airduct is provided with valve.
5, the weary gas displacement apparatus of wind of a kind of W flame boiler according to claim 2 is characterized in that: be provided with sealing flange between described secondary wind airduct and the chimney arch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101778161A CN100516651C (en) | 2007-11-21 | 2007-11-21 | W flame boiler primary air waste-steam replacement method and apparatus for |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007101778161A CN100516651C (en) | 2007-11-21 | 2007-11-21 | W flame boiler primary air waste-steam replacement method and apparatus for |
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| CN101158472A CN101158472A (en) | 2008-04-09 |
| CN100516651C true CN100516651C (en) | 2009-07-22 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101368725B (en) * | 2008-09-27 | 2010-07-21 | 哈尔滨工业大学 | Stable combustion anti-slag gap type W-shaped flame boiler apparatus |
| CN102322631A (en) * | 2011-07-08 | 2012-01-18 | 贵州电力试验研究院 | Double-cyclone cylinder burner W-shaped flame boiler capable of stably burning pulverized coal |
| CN105546525A (en) * | 2015-10-14 | 2016-05-04 | 重庆市富燃科技有限责任公司 | Method for reducing nitrogen oxides of W type coal-fired boiler |
| CN111503624B (en) * | 2020-04-08 | 2021-05-04 | 哈尔滨工业大学 | W-flame boiler with staggered secondary air on arch and gap type exhaust air and air distribution method |
| CN111947137B (en) * | 2020-08-27 | 2021-05-04 | 哈尔滨工业大学 | Oil secondary air assisted ignition self-stable combustion W flame boiler and self-stable combustion method |
| CN113280360A (en) * | 2021-06-25 | 2021-08-20 | 西安热工研究院有限公司 | Coal mill operation method suitable for deep peak shaving of boiler |
| CN114165780B (en) * | 2021-11-01 | 2023-08-22 | 东方电气集团东方锅炉股份有限公司 | W flame boiler combustion device |
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2007
- 2007-11-21 CN CNB2007101778161A patent/CN100516651C/en not_active Expired - Fee Related
Non-Patent Citations (4)
| Title |
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| FW型W火焰锅炉高负荷运行提高氧量困难的研究. 段宝林，金鑫，魏铜生，杨忠灿，柳宏刚，徐党旗.热力发电. 2007 |
| FW型W火焰锅炉高负荷运行提高氧量困难的研究. 段宝林，金鑫，魏铜生，杨忠灿，柳宏刚，徐党旗.热力发电. 2007 * |
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