CN1121278C - Efficient fine powder separator with big and small units - Google Patents
Efficient fine powder separator with big and small units Download PDFInfo
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- CN1121278C CN1121278C CN 01142053 CN01142053A CN1121278C CN 1121278 C CN1121278 C CN 1121278C CN 01142053 CN01142053 CN 01142053 CN 01142053 A CN01142053 A CN 01142053A CN 1121278 C CN1121278 C CN 1121278C
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- separator
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Abstract
The present invention relates to a composite high-efficient fine powder separator. An accessory fine powder separator is communicated with a main powder collector at the bottom of a main fine powder separator by a connecting pipe. Off gas is respectively led to a venturi injector via an off gas pipe. The main powder collector is connected with a coal powder bin via a powder dropping pipe, a gas lock and a wood scrap separator. An accessory powder collector is merged with the powder dropping pipe of the main fine powder separator or is connected with the coal powder bin via the powder dropping pipe and the gas lock. The main fine powder separator and the accessory fine powder separator are both formed by cyclone separators. A diameter of the accessory fine powder separator can be smaller than that of the main fine powder separator. The composite high-efficient fine powder separator can eliminate a secondary entrainment phenomenon of coal powder, and enables the separating efficiency of fine powder to reach more than 90%.
Description
Technical field
The invention belongs to coal-burning boiler pulverized coal preparation system special equipment, be specifically related to a kind of efficient fine powder separator with big and small units.
Background technology
Warehouse formula ball mill pulverizing system in the middle of a considerable amount of large and medium-sized coal-fired units in thermal power plant and most industrial power plants for self-supply unit are equipped with.This pulverized coal preparation system is owing to be convenient to operation, safeguard and overhaul, and lower to operations staff's requirement, therefore let it be to the greatest extent, and the powder process power consumption is that height still is widely used in China with respect to unit pulverized-coal system.
Middle warehouse formula ball mill pulverizing system comprises capital equipments such as feeder, low speed coal mill, mill separator, pulverized-coal collector, wood block separator, wood scraps separator, flapper, Powder discharging fan.This pulverized coal preparation system still a series of problem of ubiquity that is in operation comprising the wear problem of Powder discharging fan impeller, increases the workload and the recondition expense of maintenance greatly.The cause of this problem mainly is that not high, the weary band of gas powder of fine powder separative efficiency seriously causes.Even more serious is, weary band of gas powder is the flue-gas temperature raising of the boiler furnace outlet of the bin storage type pulverizing system of upward feasible outfit pulverized coal carried by hot air largely seriously, and then cause the flue gas temperature of hearth outlet of boiler obviously to improve, safe operation to superheater brings threat, causes as serious problems such as pendant superheater coking, boosters.Weary band of gas powder causes also that seriously exhaust gas temperature rises, and flue gas loss increases, and unburned combustible in fly ash increases, and boiler efficiency reduces.
Therefore the low consequence of bringing of fine powder separative efficiency is serious.Should take measures to improve the separative efficiency of fine powder, the band powder rate of the weary gas of reduction as far as possible.What bear fine powder separation task in bin storage type pulverizing system mainly is pulverized-coal collector, and the auxiliary equipment flapper plays the effect that prevents that the separated fine powder that gets off from being taken away again by air-flow.In theory, the efficient that reaches more than 90% of the various pulverized-coal collectors that generally adopt at present is unchallenged.But the fine powder separative efficiency of finding most of pulverized coal preparation systems in actual applications is all below 85%, have in addition below 80%.This just means that the band powder rate in the weary gas can reach more than the 15-20%.So high band powder rate will aggravate greatly the Powder discharging fan impeller wearing and tearing, shorten its life-span, directly have influence on the time between overhauls(TBO) of Powder discharging fan, increase recondition expense.Cause the problem on the aforesaid boiler in addition.
That what reason causes the fine powder separative efficiency low so? this will see the operation principle of pulverized-coal collector.Breeze airflow tangentially enters into pulverized-coal collector, in strong the rotatablely moving of the inner formation of pulverized-coal collector.Pulverized coal particle is got rid of to the pulverized-coal collector wall under action of centrifugal force, discharges at the following powder outlet that slides to of the effect of gravity then.And a swirling eddy part moves down, in a part of air-flow that makes progress that joins gradually on the pulverized-coal collector axial line.The swirling eddy that extends just upwards turns back after the deposition surface that runs into fine powder downwards.Cause a central area to become relative negative pressuren zone owing to rotatablely move, reach the coal dust under separated of a part in the process that the deposition surface of fine powder upwards turns back at swirling eddy and be involved in again in the air-flow again and leave pulverized-coal collector with weary gas, promptly coal powder second entrainments.The result causes the efficient of pulverized-coal collector not reach theory index.
Summary of the invention
This invention is achieved through the following technical solutions: a kind of efficient fine powder separator with big and small units, main powder collector 3 below main pulverized-coal collector 1 is communicated with an auxilliary pulverized-coal collector 12 by tube connector 11, weary gas causes venturi injector 22 through blast pipe 20,21 respectively, main powder collector 3 is connected with Pulverized Coal Bin 19 through powder sinking tube 4,6,8,10, flapper 5,9, wood scraps separator 7, and auxilliary powder collector 13 converges or is connected with Pulverized Coal Bin 19 with the powder sinking tube 10 of main pulverized-coal collector bottom through powder sinking tube 14,16,18, flapper 15,17.
Described main pulverized-coal collector 1 and auxilliary pulverized-coal collector 12 constitute by cyclone separator, and the diameter of auxilliary pulverized-coal collector 12 should be less than main pulverized-coal collector 1.
Advantage of the present invention is to eliminate the coal powder second entrainment phenomena, and the efficient that makes fine powder separate reaches more than 90%.From being reduced to below 10% more than the existing 15-20%, the reduction amplitude reaches more than the 33-50% with the band powder rate in the weary gas.This will prolong the life-span of Powder discharging fan impeller greatly, reduce maintenance load and maintenance cost, and the combustion conditions of optimization boiler, reduce the flue-gas temperature of furnace outlet, avoid or alleviate serious problems such as the coking of boiler curtain wall even booster, reduce the exhaust gas temperature of boiler, reduce unburned carbon in flue dust, improve the economy and the security of pulverized coal preparation system and boiler operatiopn.
Description of drawings
Fig. 1 is a front view of the present invention, shows the shape assumption diagram of efficient fine powder separator with big and small units;
Fig. 2 for the A-A of master's pulverized-coal collector of the present invention to cutaway view;
Fig. 3 for the B-B of master's powder collector of the present invention and auxilliary pulverized-coal collector to cutaway view.
The specific embodiment
As shown in Figure 1, wind powder mixture in the pulverized coal channel 2 is that the breeze airflow from mill separator (among the figure express) tangentially enters main pulverized-coal collector 1, produce and rotatablely move strongly, pulverized coal particle by being got rid of to the wall of pulverized-coal collector 1, slides to the powder outlet discharge and enters main powder collector 3 in that the effect of gravity is following then under action of centrifugal force.And the swirling eddy major part joins in the air-flow that makes progress on the main pulverized-coal collector axial line gradually, and the separated coal dust that gets off of another fraction air flow A and air continues to rotate downwards to enter into main powder collector 3.At this moment, most of coal dust enters Pulverized Coal Bin 19 via powder sinking tube 4, flapper 5, powder sinking tube 6, wood scraps separator 7, powder sinking tube 8, flapper 9, powder sinking tube 10 by main powder collector 3 backs respectively by gravity.The fraction air-flow of following coal dust to enter main powder collector 3 carries the thinner coal dust of a small amount of granularity then to be separated once again by the auxilliary pulverized-coal collector 12 of tube connector 11 introducings.Because the size of auxilliary pulverized-coal collector 12 is much smaller than main pulverized-coal collector 1, the fine powder separative efficiency will be higher.Coal dust under this is separated is collected in the auxilliary powder collector 13, is merged in main pulverized-coal collector powder sinking tube 10 by powder sinking tube 14, flapper 15, powder sinking tube 16, flapper 17, powder sinking tube 18 respectively then and enters Pulverized Coal Bin 19.The weary gas that comes out from auxilliary pulverized-coal collector 12 causes venturi injector 22 through blast pipe 21, and the weary gas that main pulverized-coal collector 1 comes out causes venturi injector 22 through blast pipe 20, guides Powder discharging fan (not expressing among the figure) in the lump into by total blast pipe 23 then.
Air-flow (referring to partial view B-B) direction of rotation in air-flow (referring to partial view A-A) in the main pulverized-coal collector 1, main powder collector 3 and the auxilliary pulverized-coal collector 12 is identical, rotation counterclockwise simultaneously, also clockwise direction rotation simultaneously.Be illustrated as the situation when counterclockwise rotating simultaneously.
Said pulverized-coal collector, flapper, wood scraps separator, venturi injector are commercially available shaped article in the present embodiment, and be widely-used at the power plant pulverized coal preparation system, and the diameter ratio of auxilliary pulverized-coal collector and main pulverized-coal collector is 1/5～1/2.
By such fine powder separator, the phenomenon that the common coal powder second that takes place of main pulverized-coal collector powder outlet entrainments will be eliminated.In addition because a part of air-flow leaves separator from main pulverized-coal collector powder outlet, the weary throughput of leaving by main pulverized-coal collector central upper portion pipe reduces, and speed reduces, the ability drop of carrying coal dust, band powder amount significantly reduces, and the efficient of winner's pulverized-coal collector can be sure to get more than 90%.Auxilliary pulverized-coal collector diameter is little, and separating power is strong, can realize the separative efficiency far above 90%.Final effect is that the efficient of whole fine powder piece-rate system is more than 90%.Can satisfy the requirement of boiler safety, economical operation well.
Claims (2)
1. efficient fine powder separator with big and small units, it is characterized in that the main powder collector (3) below main pulverized-coal collector (1) is communicated with an auxilliary pulverized-coal collector (12) by tube connector (11), weary gas is respectively through blast pipe (20,21) cause venturi injector (22), main powder collector (3) is through powder sinking tube (4,6,8,10), flapper (5,9), wood scraps separator (7) is connected with Pulverized Coal Bin (19), and auxilliary powder collector (13) is through powder sinking tube (14,16,18), flapper (15,17) converge with the powder sinking tube (10) of main pulverized-coal collector bottom or be connected with Pulverized Coal Bin (19).
2. efficient fine powder separator with big and small units according to claim 1, it is characterized in that described main pulverized-coal collector (1) and auxilliary pulverized-coal collector (12) constitute by cyclone separator, the diameter of auxilliary pulverized-coal collector (12) should be less than main pulverized-coal collector (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01142053 CN1121278C (en) | 2001-09-10 | 2001-09-10 | Efficient fine powder separator with big and small units |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01142053 CN1121278C (en) | 2001-09-10 | 2001-09-10 | Efficient fine powder separator with big and small units |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1335204A CN1335204A (en) | 2002-02-13 |
| CN1121278C true CN1121278C (en) | 2003-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01142053 Expired - Fee Related CN1121278C (en) | 2001-09-10 | 2001-09-10 | Efficient fine powder separator with big and small units |
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| Country | Link |
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| CN (1) | CN1121278C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103216841B (en) * | 2013-04-19 | 2016-03-09 | 国家电网公司 | Grading coal dust preparation system |
| CN108722691A (en) * | 2018-07-04 | 2018-11-02 | 广东工业大学 | A kind of fruit separating device and fruit separation method |
| CN111298993B (en) * | 2020-02-28 | 2021-10-19 | 河北科技大学 | Cyclone venturi gas-solid separator |
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2001
- 2001-09-10 CN CN 01142053 patent/CN1121278C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1335204A (en) | 2002-02-13 |
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Granted publication date: 20030917 |