CN104456598B - Superheated steam drying coal-pulverizing system - Google Patents
Superheated steam drying coal-pulverizing system Download PDFInfo
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- 238000002360 preparation method Methods 0.000 claims abstract description 67
- 239000002274 desiccant Substances 0.000 claims abstract description 53
- 239000000203 mixture Substances 0.000 claims abstract description 28
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 66
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 10
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Abstract
The invention relates to the field of pulverized coal preparation, in particular to a superheated steam drying coal-pulverizing system capable of guaranteeing safe and reliable operation. The system is used for grinding and drying raw coal to obtain pulverized coal and effectively recovering moisture in the raw coal. The system comprises a steam powder producing and drying device, a steam powder separation device, a drying agent generation device and a steam recovery device, wherein the steam powder producing and drying device is used for grinding the raw coal into a steam powder mixture and drying the raw coal through a drying agent; the steam powder separation device comprises a pulverized coal collector; the drying agent generation device comprises a steam exhaust pipe, a steam exhaust circulating pipe, a steam exhaust heater and a superheated steam pipe, the steam exhaust circulating pipe is communicated with the steam exhaust pipe to convey a part of steam in the steam exhaust pipe, the steam exhaust heater heats the steam to form superheated steam used as the drying agent, and the superheated steam pipe conveys the drying agent into the steam powder producing and drying device for circulation; the steam recovery device comprises a steam exhaust output pipe and a steam recoverer used for recovering the steam; the steam exhaust heater heats the steam in a wall-dividing mode through an external heat source to obtain the superheated steam.
Description
Technical field
The present invention relates to the pulverized coal preparation field in the industry such as electric power, metallurgy and chemical industry is and in particular to one kind being capable of safety
The superheat steam drying pulverized coal preparation system that ground runs.
Background technology
China is the country of rich coal few oil deficency, and coal is constantly in core predominantly in China's energy supply
Position, quite interior over a long time in future, the energy resource structure based on coal can be sustained in China.At present in China, coal
The 55% of total output is used for coal-fired thermal power generation, and in terms of power supply architecture, thermal power generation is the main generation mode of China, China
About 80% supply of electric power comes from fired power generating unit.
Because coal dust firing has the advantages that high combustion efficiency, technology maturation, most coal-fired power station boilers adopt
It is the coal dust suspension combustion mode with pulverized coal preparation system.Adopting unit pulverized-coal system brown coal and bituminous coal fired boiler more, usually with
Stove cigarette and hot blast mixture or hot blast are as pulverized coal preparation system desiccant；Using middle warehouse formula powder system more than meager coal and anthracite
System, usually using hot blast as pulverized coal preparation system desiccant.
In recent years, with power coal price quick go up and high-quality coal reserves in coal gross reserves ratio gradually under
Fall, becomes the outstanding problem of power industry highest attention using high water content brown coal combustion power generation.Brown coal in worldwide
Account for the 40% of world's coal gross reserves, in 290,000,000,000 tons of China's brown coal reserves, account for the 16% of domestic coal gross reserves.Brown coal
The minimum coal of degree of coalification, have that moisture is high, volatile matters are high, calorific value is low, in atmosphere easy-weathering easy spontaneous combustion the features such as, institute
To be difficult to store, also unsuitable long-distance transportation.The 3/4 of China's brown coal is distributed in the Inner Mongol and the Northeast, the full water of these brown coal
Point 25～40%, belong to old brown coal；Remaining brown coal is mainly distributed on Yunnan Province, these brown coal total moistures 40～60%,
Containing wood fibre, belong to young brown coal；And abroad the moisture as state's brown coal such as Australia, Germany, Serbia, Indonesia is higher,
May be up to 70%.
At present brown coal using main path be by electric power stations near coal-mines combustion power generation, boiler generally individually adopts blowing powder producing
System.But for high water content brown coal, make to contain a large amount of stove cigarettes and water vapour in boiler First air using unit pulverized-coal system
Deng inert media, in addition fire box temperature again low so that there is prominent combustion instability problem in high water content brown coal, cause boiler difficult
Safely and reliably to run, this seriously constrains the effectively utilizes of domestic and international high water content brown coal.It is additionally, since brown coal reactivity
Height, brown coal coal dust is inflammable and explosive, and the burning of brown coal pulverized coal preparation system and explosion issues are also a long-term puzzlement lignite-fired unit always
The outstanding problem of safe and reliable operation.
In addition, the coal prognostic reserves being located at Xinjiang of China In The Eastern Junggar Basin " quasi- east coalfield " reach 390,000,000,000 tons, it is
The maximum self-contained coalfield of China., in addition to caloric value is compared with brown coal height, other coal characteristics are similar to brown coal, it may have water for quasi- east coal
Point high (22～32%), volatile matters are high, ash fusion point is low, the feature of the low and easy spontaneous combustion of abrasiveness.The eastern coal of pin be aligned is opened in the industry at present
The large-sized station boiler sent out is all using unit pulverized-coal system, however, firing for ensureing to stablize in pulverized coal preparation system drying capacity and stove
Burn, boiler all employs very high hot blast temperature and primary air ratio.The result thereby resulting in is the smoke evacuation of these quasi- east coal burning boilers
Temperature is universal higher (exhaust gas temperature is typically more than 140 DEG C), correspondingly causes boiler thermal output and efficiency of generating unit all relatively
Low；And, too high primary air ratio makes low NO in stoveXThe tissue of burning is more difficult, i.e. NO in furnace outlet flue gasXContent
Larger, this pressure significantly increasing the follow-up denitrating flue gas of boiler and cost.
On the other hand, China's brown coal major production areas (Eastern Inner Mongolia) and quasi- east coal producing region (Xinjiang region) are pole
Degree water-deficient area.Because fired power generating unit needs to consume a large amount of water, water resources shortage has had become as these areas and has carried out power supply base
Ground is built thus developing brown coal and the primary restraining factors of quasi- east coal resource.It is well known, however, that pulverized coal preparation system is simultaneously
A drying system, for ensure breeze airflow enter furnace rear stably burn it is desirable to pulverized coal preparation system by raw coal drying to moisture content very
Low coal dust moisture.Fuel coal of power station boiler amount is huge, therefore a large amount of moisture in coal is evaporated to water vapour with coal dust in pulverized coal preparation system
Enter burner hearth, become one of constituent of boiler smoke.Thus, if former moisture in coal can be reclaimed, brown to China
Coal and quasi- east coal utilization have very important ecological protection meaning.But due to dry flue gas (mainly N a large amount of in stove2、CO2And mistake
Amount dry air) dilution, the water capacity of boiler exhaust gas and aqueous dew point temperature very low, this make by cool down boiler exhaust gas thus return
Receiving moisture therein becomes extremely difficult.Taking the in-service 600MW unit of certain combustion total moisture 40% brown coal as a example, its boiler exhaust gas amount
For 2800t/h although containing 270t/h moisture in smoke evacuation, but smoke evacuation water dew point only has 53 DEG C (water vapour volume shares 15%).
It can be seen that, because dry flue gas amount is huge and water dew point is low, reclaiming moisture in smoke evacuation needs huge flue gas cooling heat exchanger and temperature
Sufficiently low a large amount of cooling mediums, this makes, and from smoke evacuation, recovery moisture is only feasible in theory, does not have so far by cooling electricity
Stand boiler exhaust gas thus realizing the engineer applied of flue gas Water Sproading.
Content of the invention
The present invention is to carry out to solve the above problems it is therefore intended that providing one kind to have prominent energy-saving effect and water
Reclaim benefit, and the quality of pc more preferable superheat steam drying pulverized coal preparation system that ensure that safe operation and make.
The invention provides a kind of superheat steam drying pulverized coal preparation system, obtain coal dust for process is carried out to raw coal, permissible
Have the feature that, including:Vapour powder generates drying device, for carrying out to raw coal grinding formation vapour powder mixture and passing through
Desiccant is dried to raw coal；Vapour powder segregation apparatuss, for carrying out to vapour powder mixture separating, comprise：To vapour powder mixture
Carry out separating the coal collector obtaining coal dust and water vapour；Desiccant generating means, generate desiccant, comprise：Receive with coal dust
Storage be connected for convey the exhaust steam pipeline of water vapour be connected with exhaust steam pipeline for convey exhaust steam pipeline part water steam
The exhaust steam circulating line of vapour, the water vapour in exhaust steam circulating line is heated thus being formed the superheated steam as desiccant
Exhaust steam heater, desiccant is delivered to vapour powder and generates the superheat steam pipeline that is circulated in drying device；And steam
Apparatus for recovering, comprises：The exhaust steam outlet tube of another part water vapour being connected with exhaust steam pipeline for conveying exhaust steam pipeline
Road and the Steam Recovery device that reclaimed of water vapour to the output of exhaust steam output channel, wherein, exhaust steam heater is by using outer
Portion's thermal source carries out dividing wall type heating and obtains superheated steam to water vapour.
In superheat steam drying pulverized coal preparation system provided by the present invention, can also have the feature that：Wherein, vapour powder
Generate drying device to comprise：Raw coal is carried out grind and form the coal pulverizer of vapour powder mixture and be connected with the outlet of coal pulverizer use
In detached mill separator and and coal collector are carried out to the coarse powder in the vapour powder mixture after being dried by desiccant
It is connected for the Pulverized Coal Bin that coal dust is stored.
In superheat steam drying pulverized coal preparation system provided by the present invention, can also have the feature that：Wherein, vapour powder
Generate drying device also to comprise：Raw coal is carried out with the predrying pipe of pre-dried raw coal, the entrance of the predrying pipe of raw coal and coal pulverizer
It is connected, raw coal is carried out predrying.
In superheat steam drying pulverized coal preparation system provided by the present invention, can also have the feature that：Wherein, raw coal
The import of predrying pipe is communicated on superheat steam pipeline by delivery pipe, and superheated steam is also as predry drying prescription to raw coal predry
Raw coal in dry pipe carries out predrying.
In superheat steam drying pulverized coal preparation system provided by the present invention, can also have the feature that：Wherein, it is dried
Agent generating means also comprise：It is located at the exhaust steam blower fan being used for extracting water vapour from coal collector on exhaust steam pipeline and setting
The booster fan that superheated steam is pressurized is used on superheat steam pipeline.
In superheat steam drying pulverized coal preparation system provided by the present invention, can also have the feature that：Wherein, steam
Apparatus for recovering also comprises：For extracting the air ejector of condensed residual gas in Steam Recovery device, for residual gas
The burner being burnt.
In superheat steam drying pulverized coal preparation system provided by the present invention, can also have the feature that：Wherein, it is dried
Agent generating means also comprise：It is connected with exhaust steam circulating line and be used for for conveying the appendix of gas and being located on appendix
Control the control valve opening and closing appendix, control appendix to convey gas, gas to exhaust steam circulating line by control valve
As desiccant after heated, after Preset Time, control valve controls appendix to stop conveying gas to exhaust steam circulating line.
In superheat steam drying pulverized coal preparation system provided by the present invention, can also have the feature that：Wherein, gas
For in air or inerting gas any one.
In addition, the present invention also provides a kind of coal-burning boiler unit, can have the feature that, including:Superheated steam is done
Dry pulverized coal preparation system, air-supply powder feed system, boiler host computer system, wherein, superheat steam drying pulverized coal preparation system is above-mentioned overheated steaming
Vapour is dried pulverized coal preparation system.
In addition, the present invention also provides a kind of electricity generation system, can have the feature that, including:Coal-burning boiler unit with
And the generating set containing steam turbine, wherein, coal-burning boiler unit is above-mentioned boiler controller system.
The effect of invention and effect
In superheat steam drying pulverized coal preparation system of the present invention, formed after desiccant generating means are by steam heating and make
For the superheated steam of desiccant, superheated steam generates the vapour powder mixture in drying device to vapour powder and is dried, and passes through
Coal dust disconnecting gear carries out to vapour powder mixture separating and obtains coal dust and water vapour, in addition, by steam apparatus for recovering by water
Steam is reclaimed.The present invention has prominent energy-saving effect and Water Sproading benefit, and ensure that pulverized coal preparation system is safe and reliable
The quality of pc running and making is more preferable.
The present invention, with superheated steam for pulverized coal preparation system desiccant, makes whole pulverized coal preparation system run under complete inerting atmosphere,
Ensure that the safe and reliable operation of the high-volatile coal pulverized coal preparation system such as brown coal and quasi- east coal, solve long-standing problem brown coal and standard
The pulverized coal preparation system burning of eastern coal unit safety reliability service and explosion issues.
And, as desiccant and defeated powder medium is so that almost for the water vapour that the present invention is formed with the moisture in raw coal completely
Water Sproading for the powder exhaust steam processed of either pure steam becomes very easy.By the recycling and reuse of great lot of water resources, even more right
Rich coal water-deficient area has immeasurable environment protection significance.The water vapour that the present invention is produced with moisture evaporation in raw coal is for powder processed
System desiccant and coal dust pumped (conveying) medium it is achieved that the inside of inertia dried bean noodles drying prescription produces and recycling, pulverizing process
In do not need extra steam, nitrogen production system it is not required that consuming flue gas, other media such as hot blast so that powder mistake processed
Journey was both safe and reliable, and flow process is succinctly efficient.
In addition, the present invention is with superheated steam for pulverized coal preparation system desiccant, improve conventional furnace smoke drying and hot air drying mistake
Pulverized coal particle particle size uniformity poor caused by being burst by coal grain is a large amount of in journey, thus contribute to improving coal dust firing
Can, improve Combustion Efficiency of Coal Powder.
Brief description
Fig. 1 is the structured flowchart of electricity generation system in the embodiment of the present invention；
Fig. 2 is the structured flowchart of superheat steam drying pulverized coal preparation system in the embodiment of the present invention；
Fig. 3 is the structural representation of superheat steam drying pulverized coal preparation system in the embodiment of the present invention；And
Fig. 4 is the flow chart of superheat steam drying pulverized coal preparation system in the embodiment of the present invention.
Specific embodiment
In order that technological means, creation characteristic, reached purpose and effect that the present invention realizes are easy to understand, real below
Apply example in conjunction with the accompanying drawings and embodiments to the present invention relates to superheat steam drying pulverized coal preparation system is described in detail.
Fig. 1 is the structured flowchart of electricity generation system in the embodiment of the present invention.
As shown in figure 1, superheat steam drying pulverized coal preparation system 100 as pulverized coal preparation system in coal-burning boiler unit 1000 by raw coal
Grinding drying becomes combustible coal dust.Coal-burning boiler unit 1000 is as the boiler in electricity generation system 4000, coal-burning boiler machine
Group 1000 be Steam Turbine 2000 provide high-temperature high-pressure steam, high-temperature high-pressure steam do work in Steam Turbine 2000 thus
Driving steam turbine group 2000, then Steam Turbine 2000 drive generating set 3000 generated electricity.
Fig. 2 is the structured flowchart of superheat steam drying pulverized coal preparation system in the embodiment of the present invention.
As shown in Fig. 2 superheat steam drying pulverized coal preparation system 100 is used for being ground raw coal 1 and being dried thus forming one
Determine fineness and low-moisture qualified coal dust, and be heated using the formed water vapour of pulverizing process Central Plains moisture in coal evaporation
The superheated steam being formed, as desiccant and defeated powder medium, had both achieved safety powder processed and the recovery realizing former moisture in coal, by
Superheat steam drying pulverized coal preparation system 100 gained coal dust can provide coal dust to be burnt to boiler, obtains height after boiler heating water
Warm high-pressure water vapor enters Steam Turbine acting, and superheat steam drying pulverized coal preparation system 100 includes：Vapour powder generation drying device 101,
Vapour powder segregation apparatuss 102, desiccant generating means 103, steam apparatus for recovering 104.Vapour powder generates drying device 101 for right
Raw coal 1 is ground and formation vapour powder mixture is dried, and vapour powder mixture is separately obtained coal after entering vapour powder segregation apparatuss 102
Powder and exhaust steam and coal dust is stored, most of exhaust steam enters desiccant generating means 103 thus being circulated work
Make, another fraction of exhaust steam is condensed into after condensate by steam apparatus for recovering 104 and is recycled.Desiccant generates dress
Put 103 for by the exhaust steam of certain flow, i.e. steam heating becomes the superheated steam with uniform temperature, superheated steam conduct
Desiccant and defeated powder medium enter vapour powder and generate drying device 101, thus ensure vapour powder generate drying device 101 ventilation and
Drying capacity.
Fig. 3 is the structural representation of superheat steam drying pulverized coal preparation system in the embodiment of the present invention.
As shown in figure 3, vapour powder generates drying device 101 comprising：Run coal bin 4, feeder 5, coal pulverizer 6, mill separator
7.Run coal bin 4 is used for storing raw coal 1, and run coal bin 4 is connected with feeder 5 outlet, and raw coal 1 is entered by the coal gate of run coal bin 4
Enter feeder 5, the conveying metering adhesive tape within feeder 5 continuously and uniformly raw coal 1 is delivered in coal pulverizer 6, and adjusts
It is transported to the weight of the raw coal of coal pulverizer 6.Coal pulverizer 6 is used for raw coal 1 is ground and is dried with formation vapour powder mixture, coarse powder
Separator 7 is connected with coal pulverizer 6, and is arranged on the top of coal pulverizer 6, and mill separator 7 is used for vapour powder mixture is carried out
Coarse powder in vapour powder mixture is carried out separating by screening, and the coarse powder isolated reenters in coal pulverizer 6 and ground again, with
Ensure that sufficiently fine coal dust enters in vapour powder segregation apparatuss 102.In the present embodiment, coal pulverizer 6 is medium-speed pulverizer, but coal pulverizer
Can also be blower mill, low speed coal mill and other type coal pulverizer.Generally according to pulverized coal preparation system custom from coal pulverizer 6
Outlet expellant gas are referred to as exhaust steam, in the present embodiment, gas that exhaust steam acute pyogenic infection of finger tip is exported from coal pulverizer 6.
Vapour powder segregation apparatuss 102 carry out to vapour powder mixture separating, and comprise：Powder pipeline 8 processed, coal collector 9, Pulverized Coal Bin
10.
The entrance point of powder pipeline 8 processed is connected with the outlet of coal pulverizer 6, the port of export of powder pipeline 8 processed and coal collector 9
Entrance be connected, vapour powder mixture passes through in powder pipeline 8 processed entrance coal collector 9.
Coal collector 9 obtains coal dust 3 after being used for vapour powder mixture being carried out separate to be realized vapour powder with water vapour and separates, coal
The coal outlet of powder catcher 9 is connected with the coal feed point of Pulverized Coal Bin 10.Pulverized Coal Bin 10 is used for coal dust 3 is stored, Pulverized Coal Bin 10
In coal dust 3 can be transported to and carry out burning in boiler or other burner (in figure is not drawn into) and produce heat.
Desiccant generating means 103 are used for generating the superheated steam as desiccant, comprise：Exhaust steam blower fan 12, exhaust steam pipe
Road 11, exhaust steam circulating line 14, exhaust steam heater 15, superheat steam pipeline 16, booster fan 17, appendix 26, control valve 25.
Exhaust steam blower fan 12 is located on exhaust steam pipeline 11, for extracting the exhaust steam that coal collector 9 is isolated, exhaust steam blower fan 12
Entrance be connected with the gas outlet of coal collector 9 by exhaust steam pipeline 11.The exhaust steam of extraction is divided into two by exhaust steam blower fan 12
Part exports, and a part of exhaust steam enters in exhaust steam heater 15 by exhaust steam circulating line 14 and is heated to be formed to be used as and is dried
The superheated steam of agent.
Exhaust steam heater 15 is a heat exchanger that exhaust steam is heated, and in this heat exchanger, exhaust steam and heating medium enter
The wall-type heat exchange of capable not mixing hot and cold medium, so that desiccant is purer superheated steam and does not mix other gases.Enter
The flow entering the recirculation exhaust steam of exhaust steam heater 15 will meet the requirement of the ventilation needed for coal pulverizer 6, exhaust steam heater 15
The superheat steam temperature of outlet will meet the requirement of the drying capacity as pulverized coal preparation system desiccant.Exhaust steam heater 15 have plus
Thermal medium inlet 30 and Crude product input 31, heating medium can be entered in exhaust steam heater 15 by heating medium entrance 30
It is that water vapour heats to exhaust steam, then, heating medium flows out exhaust steam heater 15 by Crude product input 31, wherein,
Heating medium can be produce in boiler high-temperature flue gas, can also be the high-temperature steam extracted out by Steam Turbine or be it
It heats medium.Exhaust steam heater 15 is connected with superheat steam pipeline 16, and superheated steam passes through quilt during superheat steam pipeline 16
The booster fan 17 being arranged in superheat steam pipeline 16 enters in coal pulverizer 6 after being pressurized and is dried circulation.
Appendix 26 is connected with exhaust steam circulating line 14 and enters in exhaust steam circulating line 14 for conveying air.Control valve
25 are located on appendix 26 and are used for opening and closing appendix 26.The present embodiment, in startup stage, is controlled defeated by control valve 25
After trachea 26 is opened, air 24 enters exhaust steam pipeline 11 through appendix 26, after Preset Time, makes the powder processed of the present embodiment
System obtains enough ventilations.Air 24 completes after the startup optimization of pulverized coal preparation system as defeated powder medium and desiccant, controls
Valve 25 controls appendix 26 to cut out, and appendix 26 stops conveying air to exhaust steam pipeline 11.Then, continue fortune with the present embodiment
Row work, the share of the water vapour in exhaust steam is gradually increased, and on-condensible gas share is gradually reduced, and tends to afterwards completely by water vapour
It is dried and defeated powder.For high-volatile coal, appendix 16 can also convey inerting gas (as nitrogen, water vapour) etc. and enter
Enter exhaust steam circulating line 14, thus better ensuring that safety in start-up course for the pulverized coal preparation system.
Steam apparatus for recovering 104 is used for the water vapour of exhaust steam pipeline 11 output is reclaimed, and comprises：Exhaust steam outlet tube
Road 18, Steam Recovery device 20, air ejector 21, residual air pipeline 22 and burner 23.Exhaust steam output channel 18 and exhaust steam pipeline 11
It is connected, enters in Steam Recovery device 20 for transport portion exhaust steam, in exhaust steam output channel 18, be provided with exhaust steam regulating valve 19, use
It is adjusted in the flow to the exhaust steam entering Steam Recovery device 20.Steam Recovery device 20 is used for reclaiming exhaust steam output channel 18 and send
The water vapour entering.Air ejector 21 is located on Steam Recovery device 20, for extracting the incondensable gas in Steam Recovery device 20 thus
Ensure the condensation heat transfer effect in Steam Recovery device 20.Burner 23 is connected with air ejector 21, for taking out air ejector 21
The a small amount of fuel gas being produced by Volatile in raw coal 1 that may contain in the gas going out is (as CO, CH4) burnt
Thus by heat recovery and utilization, and these fuel gas are avoided directly to drain into air to environment.The present embodiment
In burner 23 both can be a single Small Combustion device or the boiler that coal dust is burnt, stove
The combustor of the equipment such as kiln.
Fig. 4 is the flow chart of superheat steam drying pulverized coal preparation system in the embodiment of the present invention.
As shown in figure 4, in the present embodiment, during starting, the forming step of desiccant is as follows：
First, control a certain amount of gas to enter in exhaust steam circulating line 14 by control valve 25, then controlled by closing
The valve 25 processed and valve opened on exhaust steam circulating line 14 sets up exhaust steam recirculation.Thus, this gas is by exhaust steam heater 15
Enter in coal pulverizer 6 after booster fan 17 supercharging as initial desiccant after heating and raw coal 1 is dried, then, by
In raw coal, the moisture of evaporation becomes after water vapour enters coal collector 9 together with initial desiccant and is extracted out by exhaust steam blower fan 12,
And the gaseous mixture of the output air corresponding with increased water vapour volume and water vapour, this mixing in exhaust steam output channel 18
Water vapour in gas is reclaimed by Steam Recovery device 20, and remainder air enters in air.Remaining gaseous mixture goes successively to exhaust steam
It is heated as desiccant, after so circulating, the gaseous mixture in entrance exhaust steam heater 15 becomes closer to pure in heater 15
Water vapour, water vapour becomes superheated steam after being heated by exhaust steam heater 15, superheated steam enters vapour powder as desiccant and generates
In drying device, raw coal 1 is dried.After the present embodiment starts and runs a period of time, it is mixed that exhaust steam output channel 18 exports
Close gas also close to either pure steam, raw coal 1 and desiccant are ground formation vapour powder mixture, superheated steam conduct in coal pulverizer 6
Desiccant is dried and powder feeding in coal pulverizer 6 with ventilation medium, and by coal dust and exhaust steam, (gas of coal pulverizer 6 outlet is referred to as
Exhaust steam) the vapour powder mixture that forms enters coal collector 9, and vapour powder mixture is carried out respectively obtaining by coal collector 9
Coal dust and exhaust steam, coal dust is stored by Pulverized Coal Bin 10, and exhaust steam forms superheated steam after exhaust steam heater 15, and superheated steam passes through
Booster fan 17 is pressurized, and the superheated steam after supercharging enters in coal pulverizer 6 as desiccant and is dried, and continues drying out powder processed
Stop terminating after a period of time.
The effect of embodiment and effect
In the present embodiment superheat steam drying pulverized coal preparation system, formed after desiccant generating means are by steam heating
As the superheated steam of desiccant, superheated steam generates the raw coal in drying device to vapour powder and is dried, and passes through coal dust
Segregation apparatuss carry out to vapour powder mixture separating and obtain coal dust and water vapour, in addition, by steam apparatus for recovering by water vapour
Reclaimed.The present embodiment has prominent energy-saving effect and Water Sproading benefit, and ensure that the safe and reliable fortune of pulverized coal preparation system
Go and provide high-quality coal dust boiler of feeding and other burner stability and high efficiency burning.
In the conventional datonation-inhibition inert gas flue gas of industry, nitrogen and water vapour, water vapour has optimal datonation-inhibition function.
The present embodiment, with superheated steam as desiccant, makes whole pulverized coal preparation system run under complete inerting atmosphere it is ensured that brown coal and standard
The safe and reliable operation of the high-volatile coal pulverized coal preparation system such as eastern coal, solves long-standing problem brown coal and quasi- east coal unit safety can
Pulverized coal preparation system by running burns and explosion issues.
The steam that the present embodiment is produced with pulverized coal preparation system inside completely is for desiccant and ventilation medium so that almost pure water
The waste heat of powder exhaust steam processed of steam and Water Sproading become very easy.By the waste heat recovery of powder exhaust steam processed, can further improve
Boiler and the efficiency of energy utilization of coal-fired energy consumption system；And the recycling and reuse of great lot of water resources, even more to rich coal hydropenia ground
Area has immeasurable environment protection significance.
The present embodiment setting coal collector carries out vapour powder and separates, thus obtaining low-moisture coal dust so that coal quantity
Significantly improve.This coal dust after drying and upgrading sends into boiler or kiln burning by uniform temperature air, would not
There are the low combustion instability of in-furnace temperature, low NO againXThe problems such as burning tissues are difficult；And, this coal after drying and upgrading
When powder sends into boiler combustion by uniform temperature air, because large quantity of moisture in the coal that evaporates from pulverized coal preparation system will not be again with powder feeding
Medium enters boiler, thus boiler exhaust gas amount reduces, and corresponding exhaust gas temperature also reduces, and finally makes boiler exhaust gas heat loss
It is greatly reduced, boiler thermal output significantly improves.Thus, the present embodiment makes the clean and effective of high-moisture colm using being able to reality
Existing.
The water vapour that the present embodiment is produced with moisture evaporation in raw coal for pulverized coal preparation system desiccant and coal dust pumped (conveying) medium,
The inside achieving inertia dried bean noodles drying prescription produces and recycling, does not need extra steam, nitrogen in pulverizing process
Production system is it is not required that consume other medium such as flue gas, hot blast so that pulverizing process is safe and reliable, and flow process is succinctly high
Effect.
The present embodiment, with superheated steam for pulverized coal preparation system desiccant, improves in conventional furnace smoke drying and hot-air drying process
Pulverized coal particle particle size uniformity poor caused by being burst by coal grain is a large amount of, thus contributing to improving coal powder performance,
Improve Combustion Efficiency of Coal Powder.
Certainly superheat steam drying pulverized coal preparation system involved in the present invention is not merely defined in the above-described embodiments
Structure.Above content be only present inventive concept under basic explanation, and according to technical scheme made any equivalent
Conversion, all should belong to protection scope of the present invention.
Above-mentioned embodiment is the preferred case of the present invention, is not intended to limit protection scope of the present invention.
Appendix can convey air it is also possible to directly convey any one in the inerting gas such as water vapour, nitrogen, flue gas
Kind.
When raw coal moisture is higher, the predrying pipe of raw coal, raw coal predry can also be set between coal pulverizer and feeder
The import of dry pipe is communicated on superheat steam pipeline by delivery pipe, and it is predrying that part superheated steam is transported to raw coal by delivery pipe
Directly contact with raw coal in pipe, thus carrying out to raw coal predrying, being achieved by superheated steam and raw coal is safely dried.
Predry drying prescription in the predrying pipe of raw coal is not only by delivery pipe transport portion superheated steam or mistake
Vapours pipeline is directly connected with the entrance point of the predrying pipe of raw coal, and superheated steam carries out pre- through the predrying pipe of raw coal to raw coal
Enter coal pulverizer after drying vapour powder mixture is further dried.
Superheat steam drying powder not only can be applied and grind in boiler controller system and raw coal is dried, and can be used for other
In field.
Claims (9)
1. a kind of superheat steam drying pulverized coal preparation system, obtains coal dust it is characterised in that including for raw coal is carried out with process:
Vapour powder generates drying device, for carrying out to described raw coal grinding formation vapour powder mixture and by desiccant to described
Raw coal is dried；
Vapour powder segregation apparatuss, for carrying out to described vapour powder mixture separating, comprise：Described vapour powder mixture is carried out separate
Coal collector to described coal dust and water vapour；
Desiccant generating means, generate described desiccant, comprise：It is connected with described coal collector and steam for conveying described water
Be connected with the described exhaust steam pipeline exhaust steam of the partly described water vapour for conveying described exhaust steam pipeline of the exhaust steam pipeline of vapour is followed
Endless tube road, the water vapour in described exhaust steam circulating line is heated thus being formed the exhaust steam of the superheated steam as desiccant
Heater, described desiccant is delivered to described vapour powder and generates the superheat steam pipeline being circulated in drying device；And
Steam apparatus for recovering, comprises：Another part institute being connected with described exhaust steam pipeline for conveying described exhaust steam pipeline
State the Steam Recovery device that the exhaust steam output channel of water vapour and the water vapour that described exhaust steam output channel is exported are reclaimed,
Wherein, described exhaust steam heater by using external heat source described water vapour is carried out dividing wall type heating obtain described overheated
Steam,
Described steam apparatus for recovering also comprises：For extracting the pumping of condensed residual gas in described Steam Recovery device
Device, the burner for being burnt to described residual gas.
2. superheat steam drying pulverized coal preparation system according to claim 1 it is characterised in that:
Wherein, described vapour powder generates drying device and comprises：Described raw coal is carried out grind the coal-grinding forming described vapour powder mixture
Machine is connected with the outlet of described coal pulverizer for thick in the described vapour powder mixture after being dried by described desiccant
Powder is carried out detached mill separator and is connected for the coal dust that described coal dust is stored with described coal collector
Storehouse.
3. superheat steam drying pulverized coal preparation system according to claim 2 it is characterised in that:
Wherein, described vapour powder generates drying device and also comprises：Described raw coal is carried out with the predrying pipe of pre-dried raw coal,
The predrying pipe of described raw coal is connected with the entrance of described coal pulverizer, described raw coal is carried out predrying.
4. superheat steam drying pulverized coal preparation system according to claim 3 it is characterised in that:
Wherein, the import of the predrying pipe of described raw coal is communicated on described superheat steam pipeline by delivery pipe,
Described superheated steam also carries out predrying as the described raw coal in predry drying prescription predrying pipe to described raw coal.
5. superheat steam drying pulverized coal preparation system according to claim 1 it is characterised in that:
Wherein, described desiccant generating means also comprise：It is located on described exhaust steam pipeline and be used for taking out from described coal collector
The exhaust steam blower fan of described water vapour and being arranged on is taken to be used on described superheat steam pipeline described superheated steam is pressurized
Booster fan.
6. superheat steam drying pulverized coal preparation system as claimed in any of claims 1 to 5 it is characterised in that：
Wherein, described desiccant generating means also comprise：The gas transmission being connected with described exhaust steam circulating line for conveying gas
Manage and be located at and be used on described appendix controlling the control valve opening and closing described appendix,
Described appendix is controlled to convey described gas to described exhaust steam circulating line by described control valve, described gas is heated
Afterwards as described desiccant, after Preset Time, described control valve controls described appendix to stop to described exhaust steam circulating line
Convey described gas.
7. superheat steam drying pulverized coal preparation system according to claim 1 it is characterised in that:
Wherein, described gas is any one in air or inerting gas.
8. a kind of coal-burning boiler unit is it is characterised in that include:
Superheat steam drying pulverized coal preparation system, air-supply powder feed system, boiler host computer system,
Wherein, described superheat steam drying pulverized coal preparation system is the superheated steam described in any one in the claims 1 to 7
Pulverized coal preparation system is dried.
9. a kind of electricity generation system is it is characterised in that include:
Coal-burning boiler unit and the generating set containing steam turbine,
Wherein, described coal-burning boiler unit is the coal-burning boiler unit described in the claims 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410640173.XA CN104456598B (en) | 2014-11-13 | 2014-11-13 | Superheated steam drying coal-pulverizing system |
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| CN201410640173.XA CN104456598B (en) | 2014-11-13 | 2014-11-13 | Superheated steam drying coal-pulverizing system |
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| CN102353237B (en) * | 2011-08-18 | 2013-12-11 | 西安交通大学 | High-moisture-content lignite predrying method and system integrated with thermal power plant |
| TW201341743A (en) * | 2012-04-11 | 2013-10-16 | Aslan & Co Ltd | Steam-electric coal drying system |
| CN103146454B (en) * | 2013-02-18 | 2015-02-18 | 上海锅炉厂有限公司 | High-moisture brown coal pulverizing and drying apparatus and method thereof |
| KR101408148B1 (en) * | 2013-10-30 | 2014-06-17 | 주식회사 한국테크놀로지 | System for Drying Coal using Reheat Steam |
| CN104132359A (en) * | 2014-07-31 | 2014-11-05 | 上海理工大学 | Open powder making steam warm air type boiler unit and power generation system thereof |
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