CN103712225A - Coal pulverizing system applied to small-and medium-sized pulverized-coal industry boilers - Google Patents

Coal pulverizing system applied to small-and medium-sized pulverized-coal industry boilers Download PDF

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Publication number
CN103712225A
CN103712225A CN201310673846.7A CN201310673846A CN103712225A CN 103712225 A CN103712225 A CN 103712225A CN 201310673846 A CN201310673846 A CN 201310673846A CN 103712225 A CN103712225 A CN 103712225A
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China
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coal
drying
machine
delivered
pulverized
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CN201310673846.7A
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Chinese (zh)
Inventor
王欢
王民发
郎凤娥
郎鹏德
王秀
吴少华
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山西蓝天环保设备有限公司
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Priority to CN201310673846.7A priority Critical patent/CN103712225A/en
Publication of CN103712225A publication Critical patent/CN103712225A/en

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Abstract

The invention relates to a boiler-front pulverizing system and process applicable to small-and medium-sized industry boilers, in particular to a coal pulverizing system applied to small-and medium-sized pulverized-coal industry boilers. The technical problem to be solved is to provide the coal pulverizing system which is capable of being applied to the small-and medium-sized industry boilers and preventing dust pollution, low in sealed operation cost and higher in efficiency of pulverizing devices. The technical scheme includes that the outlet of a raw coal pulverizing device is connected with the inlet of a drying device so as to convey pulverized coal sheets of raw coal to the drying device for heating and drying, the outlet of the drying device is connected with the inlet of a pulverizing device so as to convey the dried coal sheets to the pulverizing device for pulverizing. The coal pulverizing system is widely applicable to the field of coal-fired boilers.

Description

Be applied to the pulverized coal preparation system of middle-size and small-size industrial coal powder boiler

Technical field

The present invention relates to a kind of stokehold pulverized coal preparation system and technique for mediumand smallscale industrial boilers that is applicable to, be specifically related to a kind of pulverized coal preparation system that is applied to middle-size and small-size industrial coal powder boiler.

Background technology

Coal-burned industrial boiler is the main heat energy equipment of China, according to statistics, ends 2010, and sum reaches 60.12 ten thousand, and total capacity reaches 3,480,000 and steams ton, nearly 700,000,000 tons, year consumption coal.Being mainly chain furnace with coal-burned industrial boiler, account for more than 85% at present, also have in addition a small amount of reciprocal grate, fixed grate, CFBB etc.Chain furnace adopts broken coal burning, and granularity is inhomogeneous, and coefficient of excess air is high, and bulky grain burning is not thorough, and residual ash content is high, and boiler hot effect is lower, and flue gas pollutant is difficult to up to standard.

Novel energy-saving environment-friendly industrial coal powder boiler is by adopting coal dust firing core technology, integrated coal dust centralized system is standby, accurate for powder, Researched of Air Staging Combustion Burning Pulverized Coal, desulfuration in furnace, water pipe (or shell) formula boiler heat exchange, high-efficiency cloth bag dedusting, flue gas desulfurization and the overall process advanced technology such as controls automatically, have efficient energy-saving, environment-protecting clean, simple to operate, take up an area saving, the advantage such as safe and reliable.

Boiler of power plant adopts coal dust firing, and coal consumption is large, lower with respect to industrial coal powder boiler for the requirement of combustion stability.Industrial coal powder boiler coal consumption is less, requirement to combustion stability is higher, and then ature of coal is had to strict demand, and particularly moisture in coal composition, ash content, volatile matter content are all restricted, therefore, pulverized coal preparation system has material impact to industrial coal powder boiler combustion system.But existing pulverized coal preparation system adopts open type operation mostly, and dust pollution is more serious, and the efficiency of pulverized coal preparation system is lower.

In recent years, urbanization process is progressively accelerated, city central heating is universal by large area, the industrial coal powder boiler of efficient energy-saving and environment-protecting clean, to progressively be applied, concentrate and to set up powder process station and will become the development trend of industrial coal powder boiler marketing, the high-efficiency cleaning pulverized coal preparation system that exploitation is adapted to the application of industrial coal powder boiler market is significant.

Summary of the invention

The present invention has overcome the deficiency that prior art exists, and a kind of low-cost closed operation is provided, can have stopped dust pollution, improves the pulverized coal preparation system that can be applied to middle-size and small-size industrial coal powder boiler of fuel pulverizing plant efficiency.

In order to solve the problems of the technologies described above, the technical solution used in the present invention is: the pulverized coal preparation system that is applied to middle-size and small-size industrial coal powder boiler, comprise raw coal conveying breaker, drying unit and fuel pulverizing plant, described raw coal carries the outlet of breaker and the entrance of drying unit to be connected, coal cinder after raw coal fragmentation is delivered to drying unit and carries out heating, drying, the outlet of described drying unit is connected with the entrance of fuel pulverizing plant, the coal cinder after drying is delivered to fuel pulverizing plant and carries out powder process;

The structure of described fuel pulverizing plant is: comprise screw-type coal distributor, coal pulverizer, cloth bag collection machine, helix powder feeding machine, roots blower and Pulverized Coal Bin, described drying unit is connected with coal pulverizer by screw-type coal distributor, coal cinder after drying is delivered to coal pulverizer and carries out abrasive dust, the outlet of described coal pulverizer is connected with the entrance of cloth bag collection machine, the outlet of described cloth bag collection machine is connected with Pulverized Coal Bin with roots blower by helix powder feeding machine, and the coal dust under cloth bag collection machine is collected is delivered into Pulverized Coal Bin by helix powder feeding machine and roots blower;

Between each attaching parts of described fuel pulverizing plant, be all tightly connected.

Described raw coal carries the structure of breaker for comprising: indoor coal storage yard, ground reception bunker, oscillating feeder, rubber conveyer, disintegrating machine and the first belt feeder, described indoor coal storage yard is arranged on a side of ground reception bunker, raw coal adds ground reception bunker by coal pusher, the feed opening of described ground reception bunker is connected with the charging aperture of disintegrating machine with rubber conveyer by oscillating feeder, after being delivered to disintegrating machine, raw coal is broken for the coal cinder that granularity is different, the discharging opening of described disintegrating machine is connected with the entrance of drying unit by the first belt feeder, coal cinder after fragmentation is delivered to and in drying unit, carries out heating, drying,

Described raw coal is carried between each attaching parts of breaker and is and is tightly connected.

The structure of described drying unit is: comprise drying kiln, the second belt feeder, bucket elevator, run coal bin and star-like discharger, the discharging opening of described drying kiln is connected with the charging aperture of run coal bin with bucket elevator by the second belt feeder, the kiln dried coal cinder of oven dry is delivered in run coal bin through the second belt feeder and bucket elevator, the discharging opening of described run coal bin is connected with the entrance of fuel pulverizing plant by star-like discharger, the coal cinder in run coal bin is delivered to fuel pulverizing plant through star-like discharger and carries out powder process;

Between each attaching parts of described drying unit, be and be tightly connected.

The top of described the first belt feeder is provided with permanent-magnetic iron expeller, and the ironware in coal cinder is removed.

The mouth that enters of described drying kiln is provided with direct combustion hot-air furnace, the exhaust opening of described drying kiln is connected with chimney by deduster, on the furnace wall of described direct combustion hot-air furnace, be provided with air blast, the oxygen that coal dust completing combustion in direct combustion hot-air furnace is required blasts in body of heater through air channel, burner hearth outer ring, on the connecting line between described deduster and chimney, is provided with air-introduced machine.

Described coal pulverizer top is provided with coal analysis machine, and the coal dust that coal pulverizer is ground selects powder separated, and meal returns in coal pulverizer and continues abrasive dust, and qualified coal dust enters cloth bag collection machine and collects.

The beneficial effect that the present invention compared with prior art has is: what pulverized coal preparation system of the present invention adopted is the warehouse style sealing operation of negative pressure, stopped dust pollution, the coal dust having ground enters Pulverized Coal Bin to carry out to powder according to boiler load, meet boiler and open the demand of stopping, in the present invention, coal pulverizer adopts the supporting air-introduced machine of Raymond mill in addition, cloth bag collection machine, coal-grinding apparatus and receipts powder device all adopt automated control technology, the flexible start and stop of coal pulverizer have been realized, improved the efficiency of fuel pulverizing plant, cloth bag collection machine is provided with oxygen content and pressure-measuring-point, supporting low-pressure nitrogen fireproof fire-extinguishing device of while, guaranteed the safety and stability of pulverized coal preparation system, in addition direct combustion hot-air furnace adopts traditional grate furnace, by air blast and raw coal, carry the control that realizes hot-blast stove start and stop, simple to operate, be easy to management, with low cost.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the present invention is described further.

Fig. 1 is process chart of the present invention.

Fig. 2 is structural representation of the present invention.

In figure, 1 for raw coal carry breaker, 2 be drying unit, 3 for fuel pulverizing plant, 4 for direct combustion hot-air furnace, 5 for drying kiln, 6 for bucket elevator, 7 for run coal bin, 8 for screw-type coal distributor, 9 for coal pulverizer, 10 for Pulverized Coal Bin, 11 for deduster, 12 be chimney.

The specific embodiment

As shown in Figure 1 and Figure 2, the present invention is applied to the pulverized coal preparation system of middle-size and small-size industrial coal powder boiler, comprise raw coal conveying breaker 1, drying unit 2 and fuel pulverizing plant 3, described raw coal carries the outlet of breaker 1 to be connected with the entrance of drying unit 2, coal cinder after raw coal fragmentation is delivered to drying unit 2 and carries out heating, drying, the outlet of described drying unit 2 is connected with the entrance of fuel pulverizing plant 3, the coal cinder after drying is delivered to fuel pulverizing plant 3 and carries out powder process;

The structure of described fuel pulverizing plant 3 is: comprise screw-type coal distributor 8, coal pulverizer 9, cloth bag collection machine, helix powder feeding machine, roots blower and Pulverized Coal Bin 10, described drying unit 2 is connected with coal pulverizer 9 by screw-type coal distributor 8, coal cinder after drying is delivered to coal pulverizer 9 and carries out abrasive dust, the outlet of described coal pulverizer 9 is connected with the entrance of cloth bag collection machine, the outlet of described cloth bag collection machine is connected with Pulverized Coal Bin 10 with roots blower by helix powder feeding machine, and the coal dust under cloth bag collection machine is collected is delivered into Pulverized Coal Bin 10 by helix powder feeding machine and roots blower;

Between each attaching parts of described fuel pulverizing plant 3, be all tightly connected.

Described raw coal carries the structure of breaker 1 for comprising: indoor coal storage yard, ground reception bunker, oscillating feeder, rubber conveyer, disintegrating machine and the first belt feeder, described indoor coal storage yard is arranged on a side of ground reception bunker, raw coal adds ground reception bunker by coal pusher, the feed opening of described ground reception bunker is connected with the charging aperture of disintegrating machine with rubber conveyer by oscillating feeder, after being delivered to disintegrating machine, raw coal is broken for the coal cinder that granularity is different, the discharging opening of described disintegrating machine is connected with the entrance of drying unit 2 by the first belt feeder, coal cinder after fragmentation is delivered to and in drying unit 2, carries out heating, drying,

Described raw coal is carried between breaker 1 each attaching parts and is and is tightly connected.

The structure of described drying unit 2 is: comprise drying kiln 5, the second belt feeder, bucket elevator 6, run coal bin 7 and star-like discharger, the discharging opening of described drying kiln 5 is connected with the charging aperture of run coal bin 7 with bucket elevator 6 by the second belt feeder, the coal cinder of drying in drying kiln 5 is delivered in run coal bin 7 through the second belt feeder and bucket elevator 6, the discharging opening of described run coal bin 7 is connected with the entrance of fuel pulverizing plant 3 by star-like discharger, the coal cinder in run coal bin 7 is delivered to fuel pulverizing plant 3 through star-like discharger and carries out powder process;

Between described drying unit 2 each attaching parts, be and be tightly connected.

The top of described the first belt feeder is provided with permanent-magnetic iron expeller, and the ironware in coal cinder is removed.

The mouth that enters of described drying kiln 5 is provided with direct combustion hot-air furnace 4, the exhaust opening of described drying kiln 5 is connected with chimney 12 by deduster 11, on the furnace wall of described direct combustion hot-air furnace 4, be provided with air blast, the oxygen that coal dust completing combustion in direct combustion hot-air furnace 4 is required blasts in body of heater through air channel, burner hearth outer ring, on the connecting line between described deduster 11 and chimney 12, is provided with air-introduced machine.

Described coal pulverizer 9 tops are provided with coal analysis machine, and the coal dust that coal pulverizer 9 is ground selects powder separated, and meal returns in coal pulverizer 9 and continues abrasive dust, and qualified coal dust enters cloth bag collection machine and collects.

Fuel pulverizing plant 3 in the present invention, selects coal pulverizer 9 for Raymond mill, by pulverized coal preparation dispensing station, designs.The present invention is negative-pressure sealed operation, and combustion lump coal direct combustion hot-air furnace 4 is traditional grate furnace, and with the hot flue gas drying raw coal of its generation, coal pulverizer 9 grinds coal dust and collected by cloth bag collection machine, and coal dust is delivered to Pulverized Coal Bin 10 through helix powder feeding machine by roots blower.The present invention comprises raw coal and carries breaker, drying unit, fuel pulverizing plant and automatically control, and system process figure is shown in Fig. 1 and Fig. 2, and technological process is described as follows:

(1) raw coal is carried breaker

Raw coal is deposited in indoor coal storage yard, with coal pusher, raw coal is added to ground reception bunker, the oscillating feeder of coal bunker feed opening is delivered to disintegrating machine by rubber conveyer by former coal cinder, former coal cinder is broken for the coal grain that granularity is different after disintegrating machine, through the first belt feeder, carry, the first belt feeder overhung permanent-magnetic iron expeller, removes the ironware in raw coal.

(2) drying unit

Adopt the hot flue gas of a burning coal powder direct combustion hot-air furnace 4 generations as drying thermal source.Raw coal is delivered to direct combustion hot-air furnace 4 by manual monorail trolley, and air blast provides raw coal combustion required oxygen, and cold air is entered by air channel, burner hearth outer ring.Explosion proof door, spark arrester are housed on hot air duct.Flue gas after drying kiln exchange makes flue dust reach discharging standards through sack cleaner, and the flue gas after dedusting is delivered to chimney through air-introduced machine, enters atmosphere.

Coal grain after drying kiln 5 is dried is transported to bucket elevator by the second belt feeder again, after be promoted in coal pulverizer 9 run coal bin 7 above, by star-like discharger, raw coal is sent to screw-type coal distributor 8, by the screw-type coal distributor 8 of variable ratio frequency changer speed governing, give coal pulverizer 9 feed.

(3) fuel pulverizing plant

Screw-type coal distributor 8 is given coal pulverizer 9 feed, the coal dust grinding rises with drying air-flow, through coal analysis machine, select powder separated, meal returns in coal pulverizer 9 and continues abrasive dust, qualified coal dust is carried and is entered cloth bag collection machine and collect by air-flow, and the coal dust under collecting is delivered into Pulverized Coal Bin 10 by helix powder feeding machine and roots blower.Pulverized Coal Bin 10 tops are provided with cloth bag collection machine and have guaranteed the clean and tidy of working environment, and the devices such as another Pulverized Coal Bin 10 internal units are explosion-proof, nitrogen protection, guarantee the security that Pulverized Coal Bin stores.

(4) automatic control system

Automatic control system in the present invention comprises coal pulverizer 9 unit equipment start and stop, direct combustion hot-air furnace 4 start and stop, warning and protection.

Grinding machine unit equipment starts:

Roots blower---helix powder feeding machine---anti-explosion dust remover purging controller---coal pulverizer (its inner boot sequence is by main frame electronic control)---screw-type coal distributor---star-like discharger---bucket elevator---the second belt feeder---drying kiln---direct combustion hot-air furnace (starting when raw coal need to be dried, by direct combustion hot-air furnace start-up routine).

Grinding machine unit equipment stops: direct combustion hot-air furnace (by direct combustion hot-air furnace shut down procedure), and---------------------deduster purges controller---helix powder feeding machine---roots blower to coal pulverizer to screw-type coal distributor to star-like discharger to bucket elevator to the second belt feeder to drying kiln.

Direct combustion hot-air furnace igniting: raw coal is sent into vent by Trolley, constantly blasts the required whole oxygen of burning by air blast.According to hot-blast stove exit gas temperature sensor, reduce blower air quantity and raw coal conveying capacity.

Direct combustion hot-air furnace is ceased fire: stop the conveying of raw coal, machine turns off the blast.

Report to the police and protection:

1. Pulverized Coal Bin: by the Pulverized Coal Bin reserves upper limit is set to alarm, the grinding machine that reaches capacity is out of service, reaches lower limit alarm and stops hot combustion gas furnace.Setting Pulverized Coal Bin storehouse presses and Pulverized Coal Bin temperature upper limit.

2. direct combustion hot-air furnace: by hot-blast stove exit gas temperature is set, surpass setting value and start and report to the police.

3. coal pulverizer: by coal pulverizer outlet temperature capping, surpass setting value and report to the police.

Pulverized Coal Bin and cloth bag collection machine are equipped with oxygen content and pressure-measuring-point, and are equipped with low-pressure nitrogen fireproof fire-extinguishing device.Hot exhanst gas outlet, coal pulverizer body, Pulverized Coal Bin and sack cleaner are equipped with explosion proof door.

By the setting of above control program, guarantee this pulverized coal preparation system stability and continuity.

By reference to the accompanying drawings embodiments of the invention are explained in detail above, but the present invention is not limited to above-described embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from aim of the present invention, makes various variations.

Claims (6)

1. be applied to the pulverized coal preparation system of middle-size and small-size industrial coal powder boiler, it is characterized in that: comprise raw coal conveying breaker (1), drying unit (2) and fuel pulverizing plant (3), described raw coal carries the outlet of breaker (1) to be connected with the entrance of drying unit (2), coal cinder after raw coal fragmentation is delivered to drying unit (2) and carries out heating, drying, the outlet of described drying unit (2) is connected with the entrance of fuel pulverizing plant (3), the coal cinder after drying is delivered to fuel pulverizing plant (3) and carries out powder process;
The structure of described fuel pulverizing plant (3) is: comprise screw-type coal distributor (8), coal pulverizer (9), cloth bag collection machine, helix powder feeding machine, roots blower and Pulverized Coal Bin (10), described drying unit (2) is connected with coal pulverizer (9) by screw-type coal distributor (8), coal cinder after drying is delivered to coal pulverizer (9) and carries out abrasive dust, the outlet of described coal pulverizer (9) is connected with the entrance of cloth bag collection machine, the outlet of described cloth bag collection machine is connected with Pulverized Coal Bin (10) with roots blower by helix powder feeding machine, coal dust under cloth bag collection machine is collected is delivered into Pulverized Coal Bin (10) by helix powder feeding machine and roots blower,
Between each attaching parts of described fuel pulverizing plant (3), be all tightly connected.
2. the pulverized coal preparation system that is applied to middle-size and small-size industrial coal powder boiler according to claim 1, it is characterized in that: described raw coal carries the structure of breaker (1) for comprising: indoor coal storage yard, ground reception bunker, oscillating feeder, rubber conveyer, disintegrating machine and the first belt feeder, described indoor coal storage yard is arranged on a side of ground reception bunker, raw coal adds ground reception bunker by coal pusher, the feed opening of described ground reception bunker is connected with the charging aperture of disintegrating machine with rubber conveyer by oscillating feeder, after being delivered to disintegrating machine, raw coal is broken for the coal cinder that granularity is different, the discharging opening of described disintegrating machine is connected with the entrance of drying unit (2) by the first belt feeder, coal cinder after fragmentation is delivered in drying unit (2) and carries out heating, drying,
Described raw coal is carried between each attaching parts of breaker (1) and is and is tightly connected.
3. the pulverized coal preparation system that is applied to middle-size and small-size industrial coal powder boiler according to claim 1, it is characterized in that: the structure of described drying unit (2) is: comprise drying kiln (5), the second belt feeder, bucket elevator (6), run coal bin (7) and star-like discharger, the discharging opening of described drying kiln (5) is connected with the charging aperture of run coal bin (7) with bucket elevator (6) by the second belt feeder, the coal cinder of drying in drying kiln (5) is delivered in run coal bin (7) through the second belt feeder and bucket elevator (6), the discharging opening of described run coal bin (7) is connected with the entrance of fuel pulverizing plant (3) by star-like discharger, coal cinder in run coal bin (7) is delivered to fuel pulverizing plant (3) through star-like discharger and carries out powder process,
Between each attaching parts of described drying unit (2), be and be tightly connected.
4. the pulverized coal preparation system that is applied to middle-size and small-size industrial coal powder boiler according to claim 2, is characterized in that: the top of described the first belt feeder is provided with permanent-magnetic iron expeller, and the ironware in coal cinder is removed.
5. the pulverized coal preparation system that is applied to middle-size and small-size industrial coal powder boiler according to claim 3, it is characterized in that: the mouth that enters of described drying kiln (5) is provided with direct combustion hot-air furnace (4), the exhaust opening of described drying kiln (5) is connected with chimney (12) by deduster (11), on the furnace wall of described direct combustion hot-air furnace (4), be provided with air blast, the required oxygen of coal dust completing combustion in direct combustion hot-air furnace (4) is blasted in body of heater through air channel, burner hearth outer ring, on the connecting line between described deduster (11) and chimney (12), be provided with air-introduced machine.
6. according to the pulverized coal preparation system that is applied to middle-size and small-size industrial coal powder boiler described in claim 1~3 any one, it is characterized in that: described coal pulverizer (9) top is provided with coal analysis machine, the coal dust that coal pulverizer (9) is ground selects powder separated, meal returns in coal pulverizer (9) and continues abrasive dust, and qualified coal dust enters cloth bag collection machine and collects.
CN201310673846.7A 2013-12-13 2013-12-13 Coal pulverizing system applied to small-and medium-sized pulverized-coal industry boilers CN103712225A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108393187A (en) * 2018-02-06 2018-08-14 湖南三创富泰环保材料股份有限公司 A kind of grain slag vertical mill system temperature automatic control method

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CN102927579A (en) * 2012-11-09 2013-02-13 广东电网公司电力科学研究院 Coal pulverizing system
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108393187A (en) * 2018-02-06 2018-08-14 湖南三创富泰环保材料股份有限公司 A kind of grain slag vertical mill system temperature automatic control method
CN108393187B (en) * 2018-02-06 2020-06-05 湖南三创富泰环保材料股份有限公司 Automatic temperature control method for water granulated slag vertical mill system

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Application publication date: 20140409