CN104421953A - Tertiary-air powder feeding device and tertiary-air powder feeding system applied to coal-fired power plant - Google Patents
Tertiary-air powder feeding device and tertiary-air powder feeding system applied to coal-fired power plant Download PDFInfo
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- CN104421953A CN104421953A CN201310398380.4A CN201310398380A CN104421953A CN 104421953 A CN104421953 A CN 104421953A CN 201310398380 A CN201310398380 A CN 201310398380A CN 104421953 A CN104421953 A CN 104421953A
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Abstract
The invention discloses a tertiary-air powder feeding device and a tertiary-air feeding system applied to a coal-fired power plant, relates to the technical field of thermal power generation and solves the technical problem of the prior art that coal powder is prone to deposition during tertiary air powder feeding. The tertiary-air powder feeding device comprises an air box, a powder exhaust pipe, at least one powder feeding air duct and at least one tertiary air pipeline. The lower pipeline wall of each tertiary air pipeline comprises a first segment communicated with the air box and a second segment connected with the first segment. In a direction from the air box to an inlet of each tertiary air pipeline, the first segment gradually rises, and the second segment gradually descends. The tertiary-air powder feeding system comprises the tertiary-air powder feeding device provided in any technical schemes. In this way, coal powder deposition is avoided during the tertiary air powder feeding, and safety is improved during the tertiary air powder feeding.
Description
Technical field
The present invention relates to thermal power generating technology field, be specifically related to a kind of transporting pulverized coal with exhaust gas device and the vent pulverized coal handling system for coal fired power plant of this transporting pulverized coal with exhaust gas device is set.
Background technology
Vent pulverized coal handling system is mainly used in as in coal fired power plant, weary gas carried by the burner of boiler.
The coal dust that coal pulverizer grinds first is stored in Pulverized Coal Bin, and the coal dust of boiler combustion is taken by Pulverized Coal Bin by machine supplying powder, and this pulverized coal preparation system is called bin storage type pulverizing system.Drier after pulverized-coal collector is separated is called " weary gas ", and weary gas contains a small amount of coal dust (10%-15%), more moisture, and temperature is lower; In order to protection of the environment and economize energy, weary gas does not allow to enter air.
In warehouse formula pulverized coal preparation system, have two kinds of processing methods in prior art, a kind of processing method is used to pulverized coal conveying, is called transporting pulverized coal with exhaust gas; Another kind of processing method directly sends into hearth combustion, and now, weary gas is also referred to as " tertiary air ", implements system and the hot blast powder feed system of the method.
Vent pulverized coal handling system is applicable to that raw coal moisture is less, and volatile matter content is higher, is easy to the coal of catching fire and burning, as brown coal and bitumionus coal.Therefore, when coal dust is easy to deposition, also easily there is spontaneous combustion, blast etc. in system.Visible, the requirement of explosion proof of vent pulverized coal handling system is higher.When adopting the bituminous coal or brown coal that fugitive constituent is higher, in order to the needs run, powder feeding bellows need be set, as: 4 corresponding 20 powder feeding airducts of Powder discharging fan, and the non-same layer burner of powder feeding airduct that every platform Powder discharging fan is corresponding.During oepration at full load, need put into operation 3 Powder discharging fans and 16 powder feeding airducts, now arranges air-supply bellows, can facilitate the adjustment of Powder discharging fan and powder feeding airduct.
At least there is following technical problem in prior art:
In process due to transporting pulverized coal with exhaust gas in prior art, the coal dust that weary gas is carried adopts the ature of coal that fugitive constituent is higher usually, easily there is the accident such as spontaneous combustion, blast when depositing in the ature of coal that fugitive constituent is higher, so how to avoid coal dust deposition in transporting pulverized coal with exhaust gas process to become the technical problem that solution is treated harshly in this area.
Summary of the invention
The object of the invention is the vent pulverized coal handling system for coal fired power plant proposing a kind of transporting pulverized coal with exhaust gas device and this transporting pulverized coal with exhaust gas device is set, solve the technical problem that in prior art transporting pulverized coal with exhaust gas process, coal dust easily deposits.
For achieving the above object, the invention provides following technical scheme:
The transporting pulverized coal with exhaust gas device that the embodiment of the present invention provides, comprises bellows, row tube cell, at least one powder feeding airduct and at least one blast pipe road, wherein:
Described bellows are hollow structure, and the coal powder entrance of described row's tube cell is connected with the bottom of described bellows; The influent stream mouth of described powder feeding airduct is connected with the top of described bellows or sidepiece;
The head piece that goes out in described blast pipe road is connected with described bellows, and described blast pipe road comprises upper pipe wall and lower pipeline wall, the lower pipeline wall in described blast pipe road comprises the first paragraph duct wall be connected with described bellows and the second segment duct wall be connected with described first paragraph duct wall;
Going out head piece on the direction of the influent stream mouth in described blast pipe road from described blast pipe road, the position height of described first paragraph duct wall raises gradually, and the position height of described second segment duct wall reduces gradually.
In one preferably or alternatively embodiment, described blast pipe road is polyline shaped or curve-like.
In one preferably or alternatively embodiment, described blast pipe road is polyline shaped, and the angle between described first paragraph duct wall and described second segment duct wall is 45 ° ~ 80 °.
In one preferably or alternatively embodiment, the number in described blast pipe road is at least two, and the link position of at least two described blast pipe roads and described bellows is evenly arranged on described bellows.
In one preferably or alternatively embodiment, the top of described bellows is tabular, and the bottom of described bellows is funnel-form, and the part between the top of described bellows and the bottom of described bellows is rectangular-shaped;
Part between the top of described bellows and the bottom of described bellows is connected with the head piece that goes out in described blast pipe road.
In one preferably or alternatively embodiment, the internal diameter size of described row's tube cell is less than the internal diameter size of described powder feeding airduct.
In one preferably or alternatively embodiment, the internal diameter size of described powder feeding airduct is less than the internal diameter size in described blast pipe road.
In one preferably or alternatively embodiment, the number of described powder feeding airduct is 2 ~ 20.
In one preferably or alternatively embodiment, described transporting pulverized coal with exhaust gas device also comprises Powder discharging fan, and the air outlet of described Powder discharging fan is connected with the influent stream mouth in described blast pipe road, and the air inlet of described Powder discharging fan is connected with the discharge of described row's tube cell.
The vent pulverized coal handling system for coal fired power plant that the embodiment of the present invention provides, comprises the transporting pulverized coal with exhaust gas device that the arbitrary technical scheme of the present invention provides, wherein: the described powder feeding airduct of described transporting pulverized coal with exhaust gas device is connected with the burner of boiler in coal fired power plant.
Based on technique scheme, the embodiment of the present invention at least can produce following technique effect:
Because in the transporting pulverized coal with exhaust gas device that the embodiment of the present invention provides, the lower pipeline wall in blast pipe road comprises first paragraph duct wall, second segment duct wall, on from bellows to the direction of blast pipe road influent stream mouth, the position height of first paragraph duct wall raises gradually, the position height of second segment duct wall reduces gradually, so carrying out coal dust in the process of transporting pulverized coal with exhaust gas at the transporting pulverized coal with exhaust gas device using the embodiment of the present invention to provide drops at first paragraph duct wall, all can along first paragraph duct wall after second segment duct wall, second segment duct wall skids off blast pipe road, there will not be the situation that coal dust deposits, so solve the technical problem that in prior art transporting pulverized coal with exhaust gas process, coal dust easily deposits.Meanwhile, it also avoid the accident generation of the spontaneous combustion of deposition caused by coal dust, blast, so security is also even more ideal.
In addition, optimal technical scheme of the present invention compared with prior art also at least can produce following technique effect:
1. because coal dust not easily deposits, so different ature of coal and even the higher coal dust of fugitive constituent can be adapted to;
2. can according to the powder feeding airduct of the number design number of burner;
3. the setting at least two blast pipe roads makes the air flow rate in transporting pulverized coal with exhaust gas process larger, and powder feeding efficiency is higher;
4. the link position of many powder feeding airducts and bellows can be evenly distributed on the top of bellows, makes the speed of different powder feeding airduct powder feedings more even thus.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The schematic diagram of annexation between the chief component of the transporting pulverized coal with exhaust gas device that a kind of embodiment that Fig. 1 is the embodiment of the present invention provides;
The schematic diagram of annexation between the chief component of the transporting pulverized coal with exhaust gas device that the another kind of embodiment that Fig. 2 is the embodiment of the present invention provides;
The schematic diagram of annexation between the chief component of the transporting pulverized coal with exhaust gas device that another embodiment that Fig. 3 is the embodiment of the present invention provides;
Reference numeral: 1, bellows; 11, the top of bellows; 12, the bottom of bellows; 2, tube cell is arranged; 3, powder feeding airduct; 4, blast pipe road; 40, upper pipe wall; 41, first paragraph duct wall; 42, second segment duct wall.
Detailed description of the invention
Content of the present invention and the distinctive points between the present invention and prior art can be understood below with reference to accompanying drawing Fig. 1 ~ Fig. 3 and word content.Hereafter by accompanying drawing and the mode enumerating embodiment more of the present invention, technical scheme of the present invention (comprising optimal technical scheme) is described in further detail.It should be noted that: any technical characteristic in the present embodiment, any technical scheme is all one or more in the technical characteristic of plurality of optional or optional technical scheme, cannot exhaustive all alternative technical characteristics of the present invention and alternative technical scheme in order to describe succinct to need in presents, also the embodiment being not easy to each technical characteristic all emphasizes that it is one of optional numerous embodiments, so those skilled in the art should know: arbitrary technological means provided by the invention can be carried out replacing or two or more technological means or technical characteristic arbitrarily provided by the invention being carried out mutually combining and obtain new technical scheme.Any technical characteristic in the present embodiment and any technical scheme all do not limit the scope of the invention, protection scope of the present invention should comprise those skilled in the art do not pay creative work thinkable any alternate embodiments and those skilled in the art new technical scheme that two or more technological means or technical characteristic arbitrarily provided by the invention are carried out mutually combining and obtain.
Embodiments provide transporting pulverized coal with exhaust gas device that in a kind of transporting pulverized coal with exhaust gas process, coal dust not easily deposits, security is even more ideal, more practical, economic and the vent pulverized coal handling system for coal fired power plant of this transporting pulverized coal with exhaust gas device is set.
Below in conjunction with the elaboration that Fig. 1 ~ Fig. 3 carries out specifically to technical scheme provided by the invention.
As shown in FIG. 1 to 3, the transporting pulverized coal with exhaust gas device that the embodiment of the present invention provides, comprise bellows 1, row's tube cell 2, at least one powder feeding airduct 3(powder feeding airduct 3 concrete number can arrange arbitrarily as required) and at least one (be preferably two) blast pipe road 4, wherein:
Bellows 1 are hollow structure, and the influent stream mouth of powder feeding airduct 3 is connected with the top 11 of bellows 1 or sidepiece (sidepiece can be understood as: the part between the top of bellows 1 and the bottom of bellows 1), and row's coal powder entrance of tube cell 2 is connected with the bottom 12 of bellows 1.
Bellows 1 are connected with the head piece that goes out in blast pipe road 4.The link position going out head piece and bellows 1 in blast pipe road 4 is between the influent stream mouth of powder feeding airduct 3 and the link position of bellows 1 and arrange between the coal powder entrance of tube cell 2 and the link position of bellows 1, and the part be preferably between the top 11 of bellows 1 and the bottom 12 of bellows 1 is connected with the head piece that goes out in blast pipe road 4.
Blast pipe road 4 comprises upper pipe wall 40 and lower pipeline wall, and the lower pipeline wall in blast pipe road 4 comprises the first paragraph duct wall 41 be connected with bellows 1 and the second segment duct wall 42 be connected with first paragraph duct wall 41.Upper pipe wall 40 and lower pipeline wall are preferably integral structure.
Going out head piece on the direction of the influent stream mouth in blast pipe road 4 from blast pipe road 4, the position height of first paragraph duct wall 41 raises gradually, and the position height of second segment duct wall 42 reduces gradually.First paragraph duct wall 41, second segment duct wall 42 can be inclined-planes also can be the combination of curved surface or inclined-plane and curved surface.
Because in the transporting pulverized coal with exhaust gas device that the embodiment of the present invention provides, the lower pipeline wall in blast pipe road 4 comprises first paragraph duct wall 41, second segment duct wall 42, on the direction from bellows 1 to blast pipe road 4 influent stream mouth, the position height of first paragraph duct wall 41 raises gradually, the position height of second segment duct wall 42 reduces gradually, so carrying out coal dust in transporting pulverized coal with exhaust gas process at the transporting pulverized coal with exhaust gas device using the embodiment of the present invention to provide drops at first paragraph duct wall 41, all can along first paragraph duct wall 41 after second segment duct wall 42, second segment duct wall 42 skids off blast pipe road 4, there will not be the situation that coal dust deposits, simultaneously, it also avoid the spontaneous combustion of deposition caused by coal dust, the accident of blast occurs, so security is also even more ideal.
As one preferably or alternatively embodiment, blast pipe road 4 is in polyline shaped or as shown in Figure 2 curve-like as shown in Figure 1, blast pipe road 4 is preferably as shown in Figure 1 in polyline shaped, and the angle between first paragraph duct wall 41 and second segment duct wall 42 is 45 ° ~ 80 ° preferably 70 °, the shape in blast pipe road 4 can be understood as: reverse V-shaped.This structure is not only conducive to coal dust and flows out from blast pipe road 4 fast, and structure is simple, is convenient to processing and manufacturing.
As one preferably or alternatively embodiment, the number in blast pipe road 4 is at least two (being preferably two), and at least two blast pipe roads 4 are evenly arranged on bellows 1 with the link position of bellows 1.When being provided with multiple blast pipe road 4, the weary gas of conveying and the amount of coal dust can be larger, and bellows 1 input to the amount of the coal dust of different powder feeding airduct 3 also can be more even.
As one preferably or alternatively embodiment, the top 11 of bellows 1 is in tabular, and the bottom 12 of bellows 1 (is preferably in hexahedron funnel-form) in funnel-form, and the part between the top 11 of bellows 1 and the bottom 12 of bellows 1 is rectangular-shaped.Certainly, the bottom 12 of bellows 1 also can comprise at least two (being preferably 1 ~ 4) funnelform parts, and the bottom 12 of each funnelform parts all connects row's tube cell 2.This structure be convenient to coal dust from blast pipe road 4 landing to bellows 1 after, continue landing in row's tube cell 2 from the inner chamber of bellows 1.
As one preferably or alternatively embodiment, the internal diameter size (this is preferably dimensioned to be 10mm ~ 100mm) of row's tube cell 2 is preferably less than the internal diameter size of powder feeding airduct 3.The internal diameter size of powder feeding airduct 3 is preferably less than the internal diameter size in blast pipe road 4.Said structure is conducive to improving weary gas and coal dust inputs bellows 1, and enters the efficiency of powder feeding airduct 3 through bellows 1, and too much weary gas and coal dust can be avoided to flow out from arranging in tube cell 2.
As one preferably or alternatively embodiment, the number of powder feeding airduct 3 is 2 ~ 20, is preferably 10.Certainly, the number of powder feeding airduct 3 can arrange any number of according to the actual needs of burner.Powder feeding airduct 3 is preferably evenly distributed on the top 11 of bellows 1 with the link position of bellows 1.
As one preferably or alternatively embodiment, transporting pulverized coal with exhaust gas device also comprises Powder discharging fan (meaning not shown in the figures), the air outlet of Powder discharging fan is connected with the influent stream mouth (can pass through pipeline) in blast pipe road 4, and the air inlet of Powder discharging fan is connected with the discharge (can pass through pipeline) of row's tube cell 2.Also need to be connected with weary source of the gas, to gather, to absorb weary gas during the air inlet practical application of Powder discharging fan.Powder discharging fan be weary gas and coal dust flowing and through blast pipe road 4, bellows 1, then finally flow to powder feeding airduct 3 and power be provided.Meanwhile, Powder discharging fan can also reuse the coal dust that the discharge of row's tube cell 2 is collected.
The vent pulverized coal handling system for coal fired power plant that the embodiment of the present invention provides, comprises the transporting pulverized coal with exhaust gas device that the arbitrary technical scheme of the present invention provides, wherein: the powder feeding airduct 3 of transporting pulverized coal with exhaust gas device is connected with the burner of boiler in coal fired power plant.
The suitable burner be applied to as boiler in coal fired power plant (this boiler is: coal-burning boiler) of the transporting pulverized coal with exhaust gas device that the arbitrary technical scheme of the present invention provides carries out transporting pulverized coal with exhaust gas, to improve the security of powder feeding efficiency and transporting pulverized coal with exhaust gas.
As an embodiment particularly of the present invention, in coal fired power plant, boiler has 2 Pulverized Coal Bin, and corresponding 2 Powder discharging fans of each Pulverized Coal Bin, every platform Powder discharging fan connects 5 powder feeding airducts 3, totally 20 powder feeding airduct 3, five grate firing burners.Time at full capacity, put into operation 3 Powder discharging fans and 4 grate firing burners (16), if only adopt original three Powder discharging fans can only be with 15 powder feeding airducts 3, be difficult to throw and entirely enter 16 powder feeding airducts 3 corresponding to 4 grate firing burners, therefore need to arrange the transporting pulverized coal with exhaust gas device that the embodiment of the present invention provides.Wherein Powder discharging fan is made to connect 6 powder feeding airducts 3 by bellows 1.The blast pipe road 4 of " V " shape can effectively prevent coal dust in weary gas to be deposited on blast pipe road 4.
Arbitrary technical scheme disclosed in the invention described above unless otherwise stated, if the number range of it discloses, so disclosed number range is preferred number range, anyly it should be appreciated by those skilled in the art: preferred number range is only the numerical value that in many enforceable numerical value, technique effect is obvious or representative.Because numerical value is more, cannot be exhaustive, so the present invention just discloses component values to illustrate technical scheme of the present invention, and the above-mentioned numerical value enumerated should not form the restriction to the invention protection domain.
If employ the word such as " first ", " second " herein to limit parts, those skilled in the art should know: the use of " first ", " second " is only used to be convenient to describe carry out difference as not having outside Stated otherwise to parts, the implication that above-mentioned word is not special.
Simultaneously, if the invention described above discloses or relate to parts or the structural member of connection fastened to each other, so, unless otherwise stated, be fixedly connected with and can be understood as: can releasably be fixedly connected with (such as using bolt or screw to connect), also can be understood as: to be non-removablely fixedly connected with (such as rivet, weld), certainly, connection fastened to each other also can be replaced by integral type structure (such as use casting technique is integrally formed create) (obviously cannot adopt except integrally formed technique).
In addition, apply in arbitrary technical scheme disclosed in the invention described above for represent position relationship or shape term unless otherwise stated its implication comprise approximate with it, similar or close state or shape.Arbitrary parts provided by the invention both can be assembled by multiple independent part, and also can be one of the forming manufacture technics separate part out.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (10)
1. a transporting pulverized coal with exhaust gas device, is characterized in that, comprises bellows, row tube cell, at least one powder feeding airduct and at least one blast pipe road, wherein:
Described bellows are hollow structure, and the coal powder entrance of described row's tube cell is connected with the bottom of described bellows; The influent stream mouth of described powder feeding airduct is connected with the top of described bellows or sidepiece;
The head piece that goes out in described blast pipe road is connected with described bellows, and described blast pipe road comprises upper pipe wall and lower pipeline wall, the lower pipeline wall in described blast pipe road comprises the first paragraph duct wall be connected with described bellows and the second segment duct wall be connected with described first paragraph duct wall;
Going out head piece on the direction of the influent stream mouth in described blast pipe road from described blast pipe road, the position height of described first paragraph duct wall raises gradually, and the position height of described second segment duct wall reduces gradually.
2. transporting pulverized coal with exhaust gas device according to claim 1, is characterized in that, described blast pipe road is polyline shaped or curve-like.
3. transporting pulverized coal with exhaust gas device according to claim 2, is characterized in that, described blast pipe road is polyline shaped, and the angle between described first paragraph duct wall and described second segment duct wall is 45 ° ~ 80 °.
4. transporting pulverized coal with exhaust gas device according to claim 1, is characterized in that, the number in described blast pipe road is at least two, and the link position of at least two described blast pipe roads and described bellows is evenly arranged on described bellows.
5. transporting pulverized coal with exhaust gas device according to claim 1, is characterized in that, the top of described bellows is tabular, and the bottom of described bellows is funnel-form, and the part between the top of described bellows and the bottom of described bellows is rectangular-shaped;
Part between the top of described bellows and the bottom of described bellows is connected with the head piece that goes out in described blast pipe road.
6. transporting pulverized coal with exhaust gas device according to claim 1, is characterized in that, the internal diameter size of described row's tube cell is less than the internal diameter size of described powder feeding airduct.
7. transporting pulverized coal with exhaust gas device according to claim 1, is characterized in that, the internal diameter size of described powder feeding airduct is less than the internal diameter size in described blast pipe road.
8. transporting pulverized coal with exhaust gas device according to claim 1, is characterized in that, the number of described powder feeding airduct is 2 ~ 20.
9. according to the arbitrary described transporting pulverized coal with exhaust gas device of claim 1-8, it is characterized in that, described transporting pulverized coal with exhaust gas device also comprises Powder discharging fan, the air outlet of described Powder discharging fan is connected with the influent stream mouth in described blast pipe road, and the air inlet of described Powder discharging fan is connected with the discharge of described row's tube cell.
10. for a vent pulverized coal handling system for coal fired power plant, it is characterized in that, comprise the arbitrary described transporting pulverized coal with exhaust gas device of claim 1-9, wherein: the described powder feeding airduct of described transporting pulverized coal with exhaust gas device is connected with the burner of boiler in coal fired power plant.
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|---|---|---|---|
| CN201310398380.4A CN104421953B (en) | 2013-09-05 | 2013-09-05 | Transporting pulverized coal with exhaust gas device and the vent pulverized coal handling system for coal fired power plant |
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| CN201310398380.4A CN104421953B (en) | 2013-09-05 | 2013-09-05 | Transporting pulverized coal with exhaust gas device and the vent pulverized coal handling system for coal fired power plant |
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| CN104421953A true CN104421953A (en) | 2015-03-18 |
| CN104421953B CN104421953B (en) | 2016-08-17 |
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| CN101855022A (en) * | 2007-11-30 | 2010-10-06 | 三菱重工业株式会社 | Powder separation device and solid-fuel burner |
| US8298304B1 (en) * | 2009-02-20 | 2012-10-30 | Castle Light Corporation | Coal treatment process for a coal-fired power plant |
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- 2013-09-05 CN CN201310398380.4A patent/CN104421953B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101855022A (en) * | 2007-11-30 | 2010-10-06 | 三菱重工业株式会社 | Powder separation device and solid-fuel burner |
| US8298304B1 (en) * | 2009-02-20 | 2012-10-30 | Castle Light Corporation | Coal treatment process for a coal-fired power plant |
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| 岑可法等: "《大型电站锅炉安全剂优化运行技术》", 28 February 2003 * |
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