CN104355036A - Falling pipe component of coal falling pipe and coal conveying system - Google Patents
Falling pipe component of coal falling pipe and coal conveying system Download PDFInfo
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- CN104355036A CN104355036A CN201410584700.XA CN201410584700A CN104355036A CN 104355036 A CN104355036 A CN 104355036A CN 201410584700 A CN201410584700 A CN 201410584700A CN 104355036 A CN104355036 A CN 104355036A
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- drop pipe
- coal
- falling pipe
- deflector chute
- pipe parts
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Abstract
The invention discloses a falling pipe component of a coal falling pipe and a coal conveying system. The falling pipe component of the coal falling pipe comprises a falling pipe (21) with a material guide slot connection end, and further comprises a gas locking device which is close to the material guide slot connection end, wherein the gas locking device comprises a gas locking piece (11); the gas locking piece (11) comprises a fixed part (111) fixed on the falling pipe (21) and a main body part for plugging a coal falling channel of the falling pipe (21); the main body part extends from the fixed part (111) to form a gas stopping part (113) and an elastic barrier part (112) in sequence. The coal falling pipe provided by the invention can prevent gas flow with coal dust from passing, so that generation of strong gas flow can be avoided; furthermore, the falling pipe component is simple in structure and low in cost; the later repair and maintenance cost is lowered.
Description
Technical field
The present invention relates to coal feedway, particularly, relate to a kind of drop pipe parts of coal spout and comprise the coal handling system of this coal spout.
Background technology
In the coal handling system of power plant, coal is delivered to belt feeder to be transported in boiler original coal bunker by coal through coal spout usually.Coal spout generally comprises the parts such as coal breakage bucket, downtake and flame diversion trough, and coal to enter downtake from coal breakage bucket and drops on through flame diversion trough on the belt of belt feeder with conveying.
Owing to having diff-H, easily cause airborne dust in the process that therefore coal falls in downtake, especially when coal is comparatively dry, the coal stream of whereabouts carries larger wind, thus the coal dust in coal stream is kicked up.In prior art, following three kinds of methods are usually used to reduce airborne dust in coal breakage process: to hang dust-break curtain in deflector chute exit, coal spout is installed steel flapper, unpowered dust removal device is installed or water swashs dust collector.First two method supports the use usually, even if but when deflector chute exit hangs dust-break curtain and installs steel flapper on coal spout simultaneously, deflector chute outlet still has very strong wind powder to overflow, if raw coal is dry, wind powder certainly will be caused jointly to overflow fly upward, contaminated environment, therefore, its dust removing effects is also bad.In addition, when using unpowered dust removal device or sharp dust collector to reduce airborne dust, although dust removing effects is fine, but not only cost is high in this mode dedusting, and very water wasting expense electricity, and fluctuation of service, when et out of order is stopped transport, has a strong impact on dust removing effects.In addition, this dedusting method needs later stage repair and maintenance, and this is again a no small cost expense.
In sum, have in prior art that dust removing effects is bad, dedusting cost is higher, need the shortcomings such as later stage repair and maintenance.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of drop pipe parts of coal spout, these drop pipe parts can not only stop that the air-flow carrying coal dust passes through with the generation avoiding blast air, and its structure is simple, with low cost, reduce the repair and maintenance cost in later stage.
In order to solve the problems of the technologies described above, the invention provides a kind of drop pipe parts of coal spout, these drop pipe parts comprise the drop pipe with deflector chute coupling end, wherein, described drop pipe parts also comprise the air-lock device arranged near described deflector chute coupling end, this air-lock device comprises lock gas part, this lock gas part comprise be fixed on described drop pipe fixed part and packing described in the main part of coal breakage passage of drop pipe, this main part extends from described fixed part to form choke portion and elasticity barrier portion successively.
Preferably, described elasticity barrier portion is split into multiple part, and the plurality of part is respectively since described choke portion extends towards the direction away from this choke portion.
Preferably, the edge of described main part contacts with the internal face of the coal breakage passage of described drop pipe.
Preferably, the tube wall of described drop pipe is provided with opening, described fixed part is arranged in described opening and is fixed on described aperture position, and described elasticity barrier portion elasticity is connected to the position relative with described opening on the internal face of described drop pipe.
Preferably, described air-lock device also comprises reinforcement, this reinforcement and described lock gas part stacked and extend to the boundary position in described choke portion and described elasticity barrier portion along described bearing of trend from described fixed part, described fixed part is connected to described reinforcement, and described reinforcement is fixedly connected on the edge of described opening.
Preferably, described air-lock device also comprises clamping element, and the mode that the described fixed part of described lock gas part is bolted is clamped between described clamping element and described reinforcement.
Preferably, the cross-sectional plane of described drop pipe is formed as square cross section, and described lock gas part is formed as tabular.
On the basis of technique scheme, the present invention also provides a kind of coal handling system, this coal handling system comprises coal spout, this coal spout comprises coal breakage bucket and is positioned at the deflector chute below this coal breakage bucket, wherein, this coal spout also comprises drop pipe parts provided by the invention, and the described deflector chute coupling end of described drop pipe is connected to described deflector chute, and the other end relative with described deflector chute coupling end of this drop pipe is connected to described coal breakage bucket.
Preferably, described drop pipe is obliquely installed, angle α >=40 ° between this drop pipe and horizontal surface.
Preferably, the scope of the angle β between the plane at described lock gas part place and horizontal surface is: β >=40 °.
Pass through technique scheme, the drop pipe parts of coal spout provided by the invention can allow coal to flow through by air-lock device and hinder passing through of air-flow in the process used, can reach good dust removing effects, and its structure is simple, with low cost, avoids the repair and maintenance in later stage.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the schematic diagram of the detailed description of the invention of drop pipe parts according to coal spout provided by the invention, wherein in order to the structure of the air-lock device of clear display drop pipe inside, has carried out analysing and observe process to drop pipe;
Fig. 2 is the schematic diagram according to the lock gas part in the detailed description of the invention of drop pipe parts provided by the invention;
Fig. 3 is the schematic diagram according to the reinforcement in the detailed description of the invention of drop pipe parts provided by the invention;
Fig. 4 is according to the schematic diagram of the clamping element in the detailed description of the invention of drop pipe parts provided by the invention.
Description of reference numerals
11 lock gas parts; 111 fixed parts; 112 elasticity barrier portions; 113 choke portions; 12 reinforcements; 13 clamping elements; 14 reinforce weld part; 15 bolts; 16 nuts; 21 rakes; 31 horizontal surfaces.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
In the present invention, for ease of understanding and describing, when not doing contrary explanation, the noun of locality such as the D score of use is normally in below in short transverse (i.e. vertical direction); " inside and outside " refers to profile inside and outside relative to each parts itself, and " forward " or " forward " refers to the direction that coal stream flows, but the above-mentioned noun of locality is not limited to the present invention.And " air-flow " mentioned in the present invention refers to the air-flow carrying coal dust.
The invention provides a kind of drop pipe parts of coal spout, these drop pipe parts comprise the drop pipe 21 with deflector chute coupling end, wherein, drop pipe parts also comprise the air-lock device arranged near deflector chute coupling end, this air-lock device comprises lock gas part 11, this lock gas part 11 comprises the main part being fixed on the fixed part 111 of drop pipe 21 and the coal breakage passage of packing drop pipe 21, and this main part extends to form choke portion 113 and elasticity barrier portion 112 successively from fixed part 111.
At this, it is to be understood that " packing " is above meant to be two relatively independent parts by the coal breakage channel partition of drop pipe 21.In the process used, when coal flows to into coal breakage passage and arrives the position at air-lock device place, coal stream and the air-flow brought by the flowing of coal stream are blocked in the side of air-lock device, and elasticity barrier portion 112 can be made to be out of shape due to the gravity of himself when coal flows down, therefore, only have coal stream can continue flow forward by air-lock device, and air-flow is blocked in the side of air-lock device, thus cannot continues to move forward.Therefore, the whereabouts pipe fitting of coal spout provided by the invention can realize only allowing coal to flow through and do not allow the object that air-flow passes through by arranging air-lock device.
The present invention is described in detail below in conjunction with Fig. 1 to Fig. 4, for the ease of understanding and describing, in the following description, the whereabouts pipe fitting of coal spout provided by the invention is in installing condition, in this installing condition, drop pipe 21 is arranged with horizontal surface 31 one-tenth α overturning angle, and the direction shown in Fig. 1 is the flow direction of coal stream.But the present invention is not limited thereto, in actual applications, drop pipe also can vertically arrange to meet actual needs.
In order to realize the object of above-mentioned logical coal choked flow better, elasticity barrier portion 112 can be split into multiple part, the plurality of part is respectively since choke portion 113 extends towards the direction away from this choke portion 113, thus when coal flows through, the partial elastic barrier portion 112 not contacting coal stream can keep original position, avoids the whole elasticity barrier portion 112 when coal flows through be open and make the region of air-flow by flowing through without coal.Elasticity barrier portion 112 can be split according to actual conditions, such as, shown in Fig. 2, elasticity barrier portion 112 is divided into four parts, ensure that elasticity barrier portion 112 recovers, on the basis of the ability of distortion, can also effectively avoid above-mentioned situation.
In order to hinder air-flow to pass through better, the edge of main part can contact with the internal face of the coal breakage passage of drop pipe 21, thus prevents air-flow from flowing out along the edge of main part.
In addition, in the present invention, lock gas part 11 and can be fixed on drop pipe 21 by the mode of any appropriate.Preferably, in embodiment provided by the invention, being set to of lock gas part 11: as shown in fig. 1, the tube wall of drop pipe 21 can be provided with opening, fixed part 111 is arranged in opening and is fixed on aperture position, and elasticity barrier portion 112 elasticity is connected to the position relative with opening on the internal face of drop pipe 21.
In addition, cause choke portion 113 that irreversible distortion occurs to prevent because coal flows through large, air-lock device can also comprise reinforcement 12, this reinforcement 12 is stacked and extend to the boundary position in choke portion 112 and elasticity barrier portion 113 along above-mentioned bearing of trend from fixed part 111 with lock gas part 11, fixed part 111 is connected to reinforcement 12, and reinforcement 12 is fixedly connected on the edge of opening.Therefore, reinforcement 12 can not only play the effect supporting choke portion 113, but also contributes to the connection of fixed part 111.In addition, in the specific embodiment of the present invention, reinforcement is fixedly connected on the edge of opening in a welding manner, as shown in fig. 1, and in order to strengthen the intensity of weld, the position that can be welded to connect at the edge of reinforcement 12 and opening adds strong weld and is formed and reinforce weld part 114.At this, it should be noted that, choke portion 113 can have elasticity, also elasticity can not be had, but having in elastomeric situation, lose the effect of barrier air in order to prevent choke portion 113 from producing excessive flexural deformation, reinforcement 12 can extend to cover locks about 2/3rds of gas part 11 length, in this case, the length in elasticity barrier portion 112 is about 1/3rd of lock gas part 11 length.
In addition, air-lock device also comprises clamping element 13, and the mode that the fixed part 111 of lock gas part 11 is bolted is clamped between clamping element 13 and reinforcement 12, thus protection fixed part 111 is not damaged when fastening.In the specific embodiment of the present invention, can be connected by four groups of bolts 15 and nut 16 pairs of fixed parts 111 and fix, as shown in Fig. 2 and Fig. 3 and Fig. 4,
In the detailed description of the invention of drop pipe parts provided by the invention, the cross-sectional plane of drop pipe 21 can be formed as the shape of any enclosed, such as, shown in Fig. 1 to Fig. 4, the cross-sectional plane of drop pipe 21 is formed as square cross section, correspondingly, lock gas part 11 is formed as tabular, thus can make the internal face contact of the coal breakage passage of the edge contact drop pipe 21 of the main part locking gas part 11.Same, the cross-sectional plane of drop pipe 21 also can be formed as circular cross section, in this case, the position arranged according to lock gas part 11 and with respect to the horizontal plane 31 angle, the shape of lock gas part 11 correspondingly can be formed as the shape of the drop pipe 21 being adapted to have circular cross section.
In addition, for the material making lock gas part 11, as long as can meet above-mentioned functions demand, the present invention does not limit.The wire tape that secondary recovery even can be utilized to utilize can realize the object of logical coal choked flow.Therefore, this greatly reduces cost of investment.In addition, known by foregoing description, the structure of drop pipe assembly provided by the invention is very simple, and easy for installation, and be easy to change, its replacement cycle is about half a year, greatly reduces the expense even avoiding follow-up repair and maintenance.
On the basis of technique scheme, the present invention also provides a kind of coal handling system, this coal handling system comprises coal spout, this coal spout comprises coal breakage bucket and is positioned at the deflector chute below this coal breakage bucket, wherein, this coal spout also comprises drop pipe parts provided by the invention, and the deflector chute coupling end of drop pipe 21 is connected to deflector chute, and the other end relative with deflector chute coupling end of this drop pipe 21 is connected to coal breakage bucket.
By above-mentioned setting, coal handling system provided by the invention can reduce deflector chute exit effectively coal dust by arranging drop pipe parts provided by the invention pollutes, and possesses above-mentioned advantage.
In the ordinary course of things, flow to speed when reaching deflector chute thus the impact reduced belt conveyor to reduce coal, drop pipe 21 can be obliquely installed.In this case, for the material for the manufacture of drop pipe that this area is commonly used, angle when inclined-plane is more than or equal to 40 °, in the absence of external forces, coal meeting free-flowing, therefore, can have this set: angle α >=40 ° between drop pipe 21 and horizontal surface 31, thus make the coal noresidue in the coal breakage passage of drop pipe 21, ensure the smooth of coal breakage vias inner walls.
In like manner, in order to avoid producing long-pending coal phenomenon at air-lock device place, the scope of the angle β between the plane at lock gas part 11 place and horizontal surface 31 is: β >=40 °.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. the drop pipe parts of a coal spout, these drop pipe parts comprise the drop pipe (21) with deflector chute coupling end, it is characterized in that, described drop pipe parts also comprise the air-lock device arranged near described deflector chute coupling end, this air-lock device comprises lock gas part (11), this lock gas part (11) comprise be fixed on described drop pipe (21) fixed part (111) and packing described in the main part of coal breakage passage of drop pipe (21), this main part extends from described fixed part (111) to form choke portion (113) and elasticity barrier portion (112) successively.
2. drop pipe parts according to claim 1, it is characterized in that, described elasticity barrier portion (112) is split into multiple part, and the plurality of part is respectively since described choke portion (113) extends towards the direction away from this choke portion (113).
3. drop pipe parts according to claim 1, is characterized in that, the edge of described main part contacts with the internal face of the coal breakage passage of described drop pipe (21).
4. drop pipe parts according to claim 1, it is characterized in that, the tube wall of described drop pipe (21) is provided with opening, described fixed part (111) is arranged in described opening and is fixed on described aperture position, and described elasticity barrier portion (112) elasticity is connected to the position relative with described opening on the internal face of described drop pipe (21).
5. drop pipe parts according to claim 4, it is characterized in that, described air-lock device also comprises reinforcement (12), this reinforcement (12) and described lock gas part (11) are stacked and extend to the boundary position of described choke portion (112) and described elasticity barrier portion (113) along described bearing of trend from described fixed part (111), described fixed part (111) is connected to described reinforcement (12), and described reinforcement (12) is fixedly connected on the edge of described opening.
6. drop pipe parts according to claim 5, it is characterized in that, described air-lock device also comprises clamping element (13), and the mode that the described fixed part (111) of described lock gas part (11) is bolted is clamped between described clamping element (13) and described reinforcement (12).
7. according to the drop pipe parts in claim 1-6 described in any one, it is characterized in that, the cross-sectional plane of described drop pipe (21) is formed as square cross section, and described lock gas part (11) is formed as tabular.
8. a coal handling system, comprise coal spout, this coal spout comprises coal breakage bucket and is positioned at the deflector chute below this coal breakage bucket, it is characterized in that, this coal spout also comprises the drop pipe parts according to any one of claim 1-7, the described deflector chute coupling end of described drop pipe (21) is connected to described deflector chute, and the other end relative with described deflector chute coupling end of this drop pipe (21) is connected to described coal breakage bucket.
9. coal handling system according to claim 8, is characterized in that, described drop pipe (21) is obliquely installed, angle α >=40 ° between this drop pipe (21) and horizontal surface (31).
10. coal handling system according to claim 8, is characterized in that, the scope of the angle β between the plane at described lock gas part (11) place and horizontal surface (31) is: β >=40 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410584700.XA CN104355036B (en) | 2014-10-27 | 2014-10-27 | The drop pipe parts of coal spout and coal handling system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410584700.XA CN104355036B (en) | 2014-10-27 | 2014-10-27 | The drop pipe parts of coal spout and coal handling system |
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| CN104355036A true CN104355036A (en) | 2015-02-18 |
| CN104355036B CN104355036B (en) | 2016-08-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104773477A (en) * | 2015-03-26 | 2015-07-15 | 中国能源建设集团安徽省电力设计院有限公司 | Large-drop coal dropping pipe with air return function |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1931686A (en) * | 2005-09-13 | 2007-03-21 | 陆洪瑞 | Mechanically sealed valve |
| CN201190013Y (en) * | 2008-04-12 | 2009-02-04 | 襄樊凯瑞电力科技有限公司 | Three-dimensional disperse material collecting coal dropping pipe |
| CN101368625A (en) * | 2008-10-07 | 2009-02-18 | 山东泰山钢铁集团有限公司 | Large-caliber sliding chute wind screen valve |
| CN201411213Y (en) * | 2009-05-06 | 2010-02-24 | 吴啸 | Buffer air lock |
| US20120090956A1 (en) * | 2010-10-13 | 2012-04-19 | Ccc Group, Inc. | Apparatus and Method for Passive Dust Control in a Transfer Chute |
| CN202274505U (en) * | 2011-10-18 | 2012-06-13 | 吉林省电力有限公司电力科学研究院 | Coal locker for coal drop pipe of coal feeder |
| CN203064624U (en) * | 2013-02-17 | 2013-07-17 | 梅州市电业开发总公司 | Self-weight type buffer air lock |
| CN103496594A (en) * | 2013-09-27 | 2014-01-08 | 师厚刚 | Dual airlock valve |
| CN204197801U (en) * | 2014-10-27 | 2015-03-11 | 中国神华能源股份有限公司 | The drop pipe parts of coal spout and coal handling system |
-
2014
- 2014-10-27 CN CN201410584700.XA patent/CN104355036B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1931686A (en) * | 2005-09-13 | 2007-03-21 | 陆洪瑞 | Mechanically sealed valve |
| CN201190013Y (en) * | 2008-04-12 | 2009-02-04 | 襄樊凯瑞电力科技有限公司 | Three-dimensional disperse material collecting coal dropping pipe |
| CN101368625A (en) * | 2008-10-07 | 2009-02-18 | 山东泰山钢铁集团有限公司 | Large-caliber sliding chute wind screen valve |
| CN201411213Y (en) * | 2009-05-06 | 2010-02-24 | 吴啸 | Buffer air lock |
| US20120090956A1 (en) * | 2010-10-13 | 2012-04-19 | Ccc Group, Inc. | Apparatus and Method for Passive Dust Control in a Transfer Chute |
| CN202274505U (en) * | 2011-10-18 | 2012-06-13 | 吉林省电力有限公司电力科学研究院 | Coal locker for coal drop pipe of coal feeder |
| CN203064624U (en) * | 2013-02-17 | 2013-07-17 | 梅州市电业开发总公司 | Self-weight type buffer air lock |
| CN103496594A (en) * | 2013-09-27 | 2014-01-08 | 师厚刚 | Dual airlock valve |
| CN204197801U (en) * | 2014-10-27 | 2015-03-11 | 中国神华能源股份有限公司 | The drop pipe parts of coal spout and coal handling system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104773477A (en) * | 2015-03-26 | 2015-07-15 | 中国能源建设集团安徽省电力设计院有限公司 | Large-drop coal dropping pipe with air return function |
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| CN104355036B (en) | 2016-08-17 |
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