CN102923485A - Efficient positive-pressure pneumatic conveying system of pebble coal - Google Patents
Efficient positive-pressure pneumatic conveying system of pebble coal Download PDFInfo
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- CN102923485A CN102923485A CN2012104895204A CN201210489520A CN102923485A CN 102923485 A CN102923485 A CN 102923485A CN 2012104895204 A CN2012104895204 A CN 2012104895204A CN 201210489520 A CN201210489520 A CN 201210489520A CN 102923485 A CN102923485 A CN 102923485A
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Abstract
The invention relates to an efficient positive-pressure pneumatic conveying system of pebble coal for pebble coal discharge of a medium-speed coal pulverizer in a heat-engine plant. The efficient positive-pressure pneumatic conveying system of the pebble coal comprises a pebble coal bunker of which the upper end is connected with a pebble coal outlet of the medium-speed coal pulverizer, wherein the outlet at the lower end of the pebble coal bunker is connected with a feeding device; the inlet at the front end of the feeding device is connected with a compressed air pipeline; the outlet at the rear end of the feeding device is connected with the pebble coal bunker via a transfer pipeline; and a gas outlet of the pebble coal bunker exhausts through a dust remover. According to the efficient positive-pressure pneumatic conveying system, the defects of an original negative-pressure pneumatic conveying system are solved; the entire system is low in energy consumption, small in noise, high in reliability and strong in delivery capacity, and the delivery capacity of the system can be reinforced by a loose duct. Meanwhile, the situation that a solving method is provided when the system is broken down is ensured, and a vibrating screen of the pebble coal bunker can effectively remove the material which is not suitable for pneumatic conveying, and ensures that the system is not blocked.
Description
Technical field
The present invention relates to a kind of efficient pebble coal positive pressure pneumatic delivery system for the medium speed mill in heat-engine plant stone coal discharge.
Background technology
Medium-speed pulverizer is owing to small investment, and good economy performance obtains widely applying in the station boiler unit.Medium-speed pulverizer can produce pebble coal in operational process.Pebble coal is mainly derived from large, the difficult spoil that grinds of density, iron pyrite etc. in the raw coal, falls when coal mill moves below the vane, sends into the stone coal bunker by scraper plate, discharges from the stone coal discharge mouth of bottom.If stone coal discharge is untimely, bulk deposition in coal mill causes the coal mill fault to stop transport easily.
Pebble coal mainly is comprised of foreign material such as gangue, broken coal piece, stone and coal dusts, and granularity generally is not more than 50mm, and bulk density is 1.0 ~ 1.5 t/m3, and temperature is generally about 150 ℃.Pebble coal is owing to have that density is large, particle is large, hardness is high, temperature is high, contain the characteristic such as dust, so that pebble coal has certain difficulty processing and carry.Common stone coal discharge has manual emission, hydraulic discharge, three kinds of patterns of mechanical transportation.At present, because power plant's coal is changeable, the general variation of raw coal ature of coal, the foreign material such as stone, spoil, ore increase than before in the raw coal, the stone coal discharge amount increases greatly, have a strong impact on the safe operation of thermal power plant, conventional stone coal discharge mode all is difficult to solve the problem that present pebble coal amount increases greatly.
Recent domestic minority power plant processes pebble coal and transform negative-pressure pneumatic transmission system as.Air-flow with motion is the medium transport material, is the industrial transportation resources of using already, is called strength and carries.Air-transport system adopts the operation pressure of medium to be divided into that malleation is carried according to it and two types of negative pressure transportation, the negative-pressure pneumatic conveying is compared with conventional stone coal discharge mode has obvious advantage, and result of practical application also shows the requirement that substantially can satisfy power plant's stone coal discharge.
But negative-pressure pneumatic transmission system also has obvious shortcoming, and subject matter is as follows:
1, negative-pressure pneumatic transmission system needs high-power roots blower as propulsion source, and energy consumption is high;
2, the terminal air-flow velocity of system is higher, is very easy to cause pipeline and equipment attrition, causes system to work;
3, majority still adopts screw feeder as pebble coal charging instrument, can't carry for large particle diameter pebble coal, and screw feeder is very easy to et out of order as tumbler when carrying pebble coal, also easily wearing and tearing;
4, negative pressure system effective power pressure reduction mostly is a barometric pressure most, has limited the traffic capacity of air-transport system;
5, the roots blower noise is very large, becomes the new sound pollution source of power plant.
Traditional positive pneumatic conveying system generally adopts storehouse pump or screw feeder as feeding device, because the specific physical of pebble coal, storehouse pump and screw feeder all are difficult to realize the normal feed of pebble coal.
Summary of the invention
Technical matters to be solved by this invention is that the efficient pebble coal positive pressure pneumatic delivery system that a kind of energy consumption is low, noise is little, carry good stability is provided.
Efficient pebble coal positive pressure pneumatic delivery system of the present invention includes the stone coal bunker that a upper end is connected with the outlet of medium-speed pulverizer pebble coal, the outlet of stone coal bunker lower end connects a feed arrangement, described feed arrangement front end import connects compressed air piping, the back outlet of feed arrangement is connected to the stone coal bunker through delivery duct, and the gas vent of stone coal bunker is through the dust exhaustor air draft.
Be connected with one period communicating pipe between the upper space of described compressed air piping and stone coal bunker, make in the stone coal bunker to keep malleation.
Be provided with a vibration screen between described stone coal bunker upper end entrance and the lower end outlet, be unsuitable for the bulk pebble coal that strength is carried with separation.
The different transportation sections of described delivery duct are provided with several valvular loose airduct are installed, and are used for passing into when needed loose air-flow, prevent the material deposition.
But be provided with the access door of opening and closing on the bulkhead of described stone coal bunker bottom, the maintenance that is used for clearing up.
Described feed arrangement includes a feeding warehouse, and feeding warehouse leading portion top arranges inlet point, and feeding warehouse leading portion middle part is provided with the separator of battery plates of a level; The feeding warehouse front end is provided with two ventilation inlets that lay respectively at the separator of battery plates above and below, the ventilation inlet of top is connected with compressed air piping through one section blanking airduct, the ventilation inlet of below carries airduct to be connected with compressed air piping through one section, is provided with flow control device on blanking airduct and the conveying airduct; The feeding warehouse rear end is provided with the discharging opening that is connected with the pebble coal delivery duct.Be provided with a receiving hopper on the described inlet point, be connected with the pulse loose tube that can pass into air pulse on the sidewall of receiving hopper.Described feeding warehouse back segment is provided with the springboard of the level that is positioned at the separator of battery plates back lower place.
Efficient pebble coal positive pressure pneumatic delivery system of the present invention has solved the deficiency of original negative-pressure pneumatic transmission system, and the whole system energy consumption is low, and noise is little, and reliability is high, and traffic capacity is strong; Adopt the loose airduct can the strengthening system traffic capacity, there be solution in the system that guarantees simultaneously when et out of order; Stone coal bunker vibration screen can effectively be removed and be not suitable for the material that strength is carried, and the assurance system is jam not.Its feed arrangement does not adopt any tumbler, and reliability is high; Can control the pebble coal blanking velocity by compressed air require in the adjusting blanking airduct, carry the airduct compressed air require can control the pumped (conveying) medium amount by regulating, thereby make system can fully adapt to the stone coal discharge demand of various speed, be disposed at simultaneously economic pumped (conveying) medium amount, thereby make the energy consumption of whole system drop to minimum; Separator of battery plates can be regulated to adapt to large particle diameter pebble coal and carry, and springboard can make pebble coal that rate of onset is arranged and be in air-flow velocity highest region territory, is conducive to the smooth and easy conveying of pebble coal.
Description of drawings
Fig. 1 is the Facad structure scheme drawing of the embodiment of the invention;
Fig. 2 is the plan structure scheme drawing of Fig. 1;
Fig. 3 is the local structure for amplifying scheme drawing of the stone coal bunker part of the embodiment of the invention;
Fig. 4 is feed arrangement structural representation of the present invention.
The specific embodiment
As Figure 1-3, this efficient pebble coal positive pressure pneumatic delivery system includes the stone coal bunker 1 that a upper end is connected with the outlet of medium-speed pulverizer pebble coal, the outlet of stone coal bunker lower end connects a feed arrangement 2, described feed arrangement 2 front end imports connect compressed air piping 3, the back outlet of feed arrangement 2 is connected to stone coal bunker 5 through delivery duct 4, and the gas vent of stone coal bunker is through dust exhaustor 6 air drafts.Be connected with one period communicating pipe 7 between the upper space of compressed air piping 3 and stone coal bunker 1, make in the stone coal bunker to keep malleation.Be provided with a vibration screen 11 between the outlet of end entrance and lower end on the stone coal bunker 1, be unsuitable for the bulk pebble coal that strength is carried with separation.The different transportation sections of delivery duct 4 are provided with several valvular loose airduct 41 are installed, and are used for passing into when needed loose air-flow, prevent the material deposition.But be provided with the access door 12 of opening and closing on the stone coal bunker 1 bottom bulkhead, the maintenance that is used for clearing up.
As shown in Figure 4, feed arrangement 2 includes a feeding warehouse 21, and feeding warehouse leading portion top arranges inlet point 22, and feeding warehouse leading portion middle part is provided with the separator of battery plates 23 of a level; The feeding warehouse front end is provided with two ventilation inlets that lay respectively at the separator of battery plates above and below, the ventilation inlet of top is connected with compressed air piping P through one section blanking airduct 24, the ventilation inlet of below carries this P of airduct 25 and compressed air piping to be connected through one section, is provided with flow control device on blanking airduct and the conveying airduct; The feeding warehouse rear end is provided with the discharging opening 26 that is connected with the pebble coal delivery duct.Be provided with a receiving hopper 27 on the inlet point 22, be connected with the pulse loose tube 28 that can pass into air pulse on the sidewall of receiving hopper.The feeding warehouse back segment is provided with the springboard 29 of the level that is positioned at separator of battery plates 23 back lower places.
Claims (8)
1. efficient pebble coal positive pressure pneumatic delivery system, it is characterized in that: it includes the stone coal bunker (1) that a upper end is connected with the outlet of medium-speed pulverizer pebble coal, the outlet of stone coal bunker lower end connects a feed arrangement (2), described feed arrangement (2) front end import connects compressed air piping (3), the back outlet of feed arrangement (2) is connected to stone coal bunker (5) through delivery duct (4), and the gas vent of stone coal bunker is through dust exhaustor (6) air draft.
2. be connected with one period communicating pipe (7) between the upper space of compressed air piping (3) and stone coal bunker (1), make in the stone coal bunker to keep malleation.
3. efficient pebble coal positive pressure pneumatic delivery system according to claim 1 is characterized in that: be provided with a vibration screen (11) between the upper end entrance of stone coal bunker (1) and the lower end outlet.
4. efficient pebble coal positive pressure pneumatic delivery system according to claim 1, it is characterized in that: the different transportation sections of delivery duct (4) are provided with several valvular loose airduct (41) are installed.
5. efficient pebble coal positive pressure pneumatic delivery system according to claim 1 is characterized in that: stone coal bunker (1) but be provided with the access door (12) of opening and closing on the bulkhead of bottom.
6. efficient pebble coal positive pressure pneumatic delivery system according to claim 1, it is characterized in that: described feed arrangement (2) includes a feeding warehouse (21), feeding warehouse leading portion top arranges inlet point (22), and feeding warehouse leading portion middle part is provided with the separator of battery plates (23) of a level; The feeding warehouse front end is provided with two ventilation inlets that lay respectively at the separator of battery plates above and below, the ventilation inlet of top is connected with compressed air piping P through one section blanking airduct (24), the ventilation inlet of below carries airduct (25) to be connected with this P of compressed air piping through one section, is provided with flow control device on blanking airduct and the conveying airduct; The feeding warehouse rear end is provided with the discharging opening (26) that is connected with the pebble coal delivery duct.
7. efficient pebble coal positive pressure pneumatic delivery system according to claim 5 is characterized in that: be provided with a receiving hopper (27) on the inlet point (22), be connected with the pulse loose tube (28) that can pass into air pulse on the sidewall of receiving hopper.
8. efficient pebble coal positive pressure pneumatic delivery system according to claim 5, it is characterized in that: the feeding warehouse back segment is provided with the springboard (29) of the level that is positioned at separator of battery plates (23) back lower place.
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| CN2012104895204A CN102923485A (en) | 2012-11-27 | 2012-11-27 | Efficient positive-pressure pneumatic conveying system of pebble coal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103133031A (en) * | 2013-02-28 | 2013-06-05 | 中国矿业大学 | Underground coal and gangue separation, conveying and filling method and equipment |
| CN103321675A (en) * | 2013-05-14 | 2013-09-25 | 中国矿业大学 | Pneumatic conveying and filling method and equipment for gangue in underground coal mine |
| CN105022418A (en) * | 2015-08-04 | 2015-11-04 | 衡阳中微科技开发有限公司 | Method for stabilization of air flow of negative pressure pneumatic transport system through flow automatic regulator |
| CN106345593A (en) * | 2016-09-30 | 2017-01-25 | 中国电力工程顾问集团西南电力设计院有限公司 | Arrangement structure of preparation system for limestone powder and process flow |
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| US5033914A (en) * | 1989-09-29 | 1991-07-23 | Cyclonaire Corporation | High efficiency feeder apparatus for pneumatic conveying lines |
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| CN201603602U (en) * | 2010-03-05 | 2010-10-13 | 江苏中能电力设备有限公司 | High-efficiency environment-friendly stone coal negative-pressure pneumatic conveying system |
| CN201619881U (en) * | 2010-03-05 | 2010-11-03 | 江苏中能电力设备有限公司 | Two-channel adjustable pebble coal feeding device |
| CN101962125A (en) * | 2010-11-04 | 2011-02-02 | 南京顺风气力输送系统有限公司 | Positive and negative pressure integrated storehouse pump |
| CN202935946U (en) * | 2012-11-27 | 2013-05-15 | 西安热工研究院有限公司 | Efficient positive-pressure pneumatic conveying system of pebble coal |
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2012
- 2012-11-27 CN CN2012104895204A patent/CN102923485A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5033914A (en) * | 1989-09-29 | 1991-07-23 | Cyclonaire Corporation | High efficiency feeder apparatus for pneumatic conveying lines |
| CN2633833Y (en) * | 2003-06-24 | 2004-08-18 | 彩虹彩色显像管总厂 | Solid medicine adder |
| CN201603602U (en) * | 2010-03-05 | 2010-10-13 | 江苏中能电力设备有限公司 | High-efficiency environment-friendly stone coal negative-pressure pneumatic conveying system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103133031A (en) * | 2013-02-28 | 2013-06-05 | 中国矿业大学 | Underground coal and gangue separation, conveying and filling method and equipment |
| CN103133031B (en) * | 2013-02-28 | 2015-05-20 | 中国矿业大学 | Underground coal and gangue separation, conveying and filling method and equipment |
| CN103321675A (en) * | 2013-05-14 | 2013-09-25 | 中国矿业大学 | Pneumatic conveying and filling method and equipment for gangue in underground coal mine |
| CN103321675B (en) * | 2013-05-14 | 2015-06-10 | 中国矿业大学 | Pneumatic conveying and filling method and equipment for gangue in underground coal mine |
| CN105022418A (en) * | 2015-08-04 | 2015-11-04 | 衡阳中微科技开发有限公司 | Method for stabilization of air flow of negative pressure pneumatic transport system through flow automatic regulator |
| CN105022418B (en) * | 2015-08-04 | 2018-12-14 | 衡阳中微科技开发有限公司 | Stablize the method for negative-pressure pneumatic transmission system air flow rate by automatic flow rate adjusting device |
| CN106345593A (en) * | 2016-09-30 | 2017-01-25 | 中国电力工程顾问集团西南电力设计院有限公司 | Arrangement structure of preparation system for limestone powder and process flow |
| CN106345593B (en) * | 2016-09-30 | 2019-09-13 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of agstone preparation system arragement construction and process flow |
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Application publication date: 20130213 |