CN109439378A - The upgrading system and method for upgrading of low-order coal pulverized coal forming are carried out using waste heat flue gas - Google Patents
The upgrading system and method for upgrading of low-order coal pulverized coal forming are carried out using waste heat flue gas Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 195
- 239000003546 flue gas Substances 0.000 title claims abstract description 75
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000002918 waste heat Substances 0.000 title claims abstract description 32
- 239000002817 coal dust Substances 0.000 claims abstract description 50
- 238000000465 moulding Methods 0.000 claims abstract description 44
- 239000000428 dust Substances 0.000 claims abstract description 31
- 238000003860 storage Methods 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000007789 gas Substances 0.000 claims description 25
- 239000003077 lignite Substances 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 15
- 230000008676 import Effects 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 235000019504 cigarettes Nutrition 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 6
- 230000002269 spontaneous effect Effects 0.000 abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 24
- 239000011230 binding agent Substances 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 239000010117 shenhua Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 230000002411 adverse Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000004484 Briquette Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000001192 hot extrusion Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 206010013786 Dry skin Diseases 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 239000010866 blackwater Substances 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/04—Raw material of mineral origin to be used; Pretreatment thereof
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/34—Other details of the shaped fuels, e.g. briquettes
- C10L5/36—Shape
- C10L5/363—Pellets or granulates
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
Abstract
The invention discloses the upgrading system and method for upgrading that carry out low-order coal pulverized coal forming using waste heat flue gas, the upgrading system includes feeder, flue gas pipe drier, filter cartridge dust remover, recyclable device, desulfurizer, coal dust storage tank, precompressed exhaust apparatus and dry coal dust molding machine；The raw coal bucket for adding raw coal is provided at the top of feeder, feeder bottom is connected to by pipeline with the feeding inlet of flue gas pipe drier；The top of flue gas pipe drier is provided with dry steam exhaust outlet, and the flue gas inlet port that has surplus heat is arranged in lower part, and bottom is provided with the discharge bucket for dry coal dust to be discharged, and discharge bucket is connected to by pipeline with the feeding inlet at the top of precompressed exhaust apparatus；Dry steam exhaust outlet is connected to by pipeline with the air inlet of filter cartridge dust remover.Upgrading system scientific arrangement is reasonable, and the moisture-free coal grain graininess of precompressed exhaust apparatus and dry coal dust molding machine discharge is 30 mm-35mm.It effectively prevent air to enter system, oxygen content is low, the case where avoiding the occurrence of dry coal spontaneous combustion.
Description
Technical field
The present invention relates to Coal dressing technical field of comprehensive utilization, especially with waste heat flue gas carry out low-order coal coal dust at
The upgrading system and method for upgrading of type.
Background technique
Low-order coal is the coal in low metamorphic episode, is classified according to national coal seam coal standard (GB/T 17607), dry nothing
The coal of grey base high calorific power Qar, maf less than 24MJ/kg is defined as low-order coal.Low-order coal be divided into low-disintegration coal (jet coal,
Non caking coal, weakly caking coal) and lignite, about 567,100,000,000 tons of total resources are verified, reserves account for 55% or more of coal resource total amount.As low
The important composition of rank coal, lignite are the minimum pit coals of degree of coalification.China's lignite reserves are huge, and lignite resource amount is about
3194.38 hundred million tons, the 5.74% of coal resources in China total amount is accounted for, lignite verifies 1291.32 hundred million tons of reserves, Zhan Quanguo coal
Charcoal verifies the 12.69% of reserves.Country payes attention to the exploitation of low order coal resource further in recent years, National Development and Reform Commission
The 13 Large-scale Coal bases built in the Dissertation of Development of Coal Industry Eleventh Five-Year Plan that member can issue in January, 2007, including
Illiteracy east and Yunnan-Guizhou coal base Liang Ge based on lignite.In recent years, low-order coal increase of production is obvious, and only Inner Mongolia Autonomous Region is low
Rank output of coal was just risen to 309,620,000 tons in 2011 by 173,180,000 tons in 2008.As low-order coal is produced in coal in China
In ratio be continuously improved, can cleanly and efficiently utilize low-order coal, can be effectively relieved the following regional economy sustainable growth and
The contradiction of energy shortage ensures national energy security.
Low-order coal has the characteristics that calorific value is low, moisture is high and volatile matter is high.Low order calorific value of coal is only 3000-3500
Kcal/kg uses design the boiler of power plant of 5000 Kcal/kg bituminous coal, cannot directly use low-order coal, can only be used to mix
It burns；Low order moisture content of coal is high, about 30%-50%, it is high to lead to unit calorific value transportation cost, and the thermal efficiency directly to burn is lower；This
Outside, low-order coal volatile matter is up to 30%-45%, oxidizable spontaneous combustion, easy-weathering fragmentation, unsuitable long term storage, leads to remote way transport peace
Full property is poor, it is difficult to large-scale develop and utilize.It can be seen that low-order coal self-characteristic significantly limits the direct benefit of resource
With then low-order coal molding upgrading becomes the key utilized for low-order coal Efficient Development.
Low-order coal form upgrading is high by moisture, calorific value is low, using narrow low-order coal be transformed into moisture is low, calorific value is high,
The moulded coal fuel product of wide application changes the low-order coal tradition inefficient, seriously polluted for combustion power generation and utilizes mode,
Low-order coal cascade development comprehensive utilization is realized, the comprehensive utilization ratio and added value of product of non-renewable energy resource are improved.It mentions
It while matter, solves low-order coal weathering and spontaneous combustion problems, improves Storage period and long distance transportation economy, it is dirty to mitigate environment
Dye, effectively increases economic efficiency, and meet national related industry policy.
Heat-force dry technique main operational principle be made by heat transfer low-order coal less than 250 DEG C at a temperature of evaporate
Moisture simultaneously excludes.Drying process is used to handle the existing very long history of low-order coal, and drying process can be divided into directly by heat exchange mode
Heat exchange and indirect heat exchange can be divided into steam heating, flue gas, hot oil heating etc. according to heat medium difference.
Hot fume dry technology is at abroad, beauty, day, moral, Ao Deng state have carried out research and experiment work extensively, such as the big benefit of Australia
Straight pipe type airflow dry technology is used in the BCB technology of sub- White energy company, Germany Ze Make (ZEMAG) is used back
Elbow type dry technology, the U.S. power plant River Basin Powder are in the steam-air combined drying succeeded in developing in recent years
Technology and Japan UBC lignite upgrading technology etc..
China starts to carry out the R and D work of coal drying process the 1950s.Dalian University of Technology, China
The units such as mining industry university, Shenhua Group, successively develop the coal dry technology of different process, and establish Large Scale Industrial Process.Such as
Shenhua and the HPU technology of China Mining University's cooperative development are knots on the basis of reference Australia White energy BCB technology
Close the relevant technologies of the professional unit such as domestic technique research or device fabrication, a set of new lignite upgrading technology of research and development；
Chinese Shen Gong group SZ vibrating mixed flow bed dry technology, Shandong Tian Li company superheated steam rotary drying technology etc. are independently to grind
The novel dried technique of hair, the feasibility of these technologies are succeeded in industrial applications verifying.
In addition, forming upgrading field in low-order coal, moisture-free coal forming technique is particularly important.By molding, drying can be improved
Coal energy density；It can solve the problems, such as the easy spontaneous combustion of lignite, be not easy to store and transport and make the lignite satisfactionization after drying and upgrading
The different fields demand such as work and power plant.
The molding shaped coal technology of moisture-free coal mainly has adhesive cool molded and the hot-forming two major classes of binder free.Have viscous
It ties in agent cold moudling technology, briquette binder is one of molding key, it occupies the dominant contribution of moulded coal processing cost,
And different its binder type of coal quality, proportion be not again identical, causes its process system complicated；Binder free hot extrusion briquetting technique is
By brown coal drying, the directly technology of compression moulding under high pressure is heated to after certain temperature and held for some time.Due to bonding
Consumption of binder needed for agent molding production moulded coal is big, complex process, causes moulded coal production cost higher, this situation also restricts
China moulded coal industrial expansion.For the dosage for reducing binder in industrial shaping coal production, industrial shaping coal production cost is reduced, is fitted
The needs of fine coal high temperature binder free moulding process are answered, successively have developed the high pressure pair suitable for mesohigh moulding process both at home and abroad
Roller industrial shaping coal molding machine.Binder free hot extrusion briquetting technique is at low cost, simple process, is the important of current lignite clean technology
One of developing direction.
Wherein, in Australian BCB technique, 1,000,000 tons/year of lignite are established in BAYAN company, Indonesia within 2009 and done
Dry, molding project.It is reported that the project uses the binder free forming technique of U.S. K. R. Komarek company, in molding work
Section installs 17 molding equipments that the said firm provides altogether, has no the relevant report of its successful operation at present.According to its
17 molding machines used in 1,000,000 tons/year of projects of BAYAN company calculate that company is molding right for lignite binder free
The separate unit production capacity of roller molding machine is about 10 t/h, and there are larger discrepancy with the production capacity of its 50-80t/h publicized.
There is the lignite upgrading molding research history of upper a century in German ZEMAG company, wherein being made with German black water pump works
The said firm is dry, forming technique is representative.But later due to being influenced by relevant policies, the said firm's announcement of bankruptcy is closed down.
Certain domestic the said firm, corporate buyout in 2006 and owned relevant knowledge property right, and brown coal drying, molding are carried out at home
The marketing of technology.In recent years, the said firm is that certain domestic company manufactures 5 type roller briquetting machines of PWP1000 × 930.
The molding machine passes through its cold pressing of hot-forming moulded coal after Jin Xin chemical company has carried out multiple test run test and retrofit work
Intensity is 1000-1500N/.Up to the present, since equipment balling ratio is lower, briquette strength is poor, practical production capacity and design value
It differs greatly etc. and dust is larger, the reasons such as safety accident occurs when system is run, the molding equipment is caused to fail normally to transport
Turn.
Chinese Shenhua HPU lignite hot press forming technology, 2007, middle letter heavy industry and Shenhua international trade, China Mining University were (northern
Capital) start to cooperate with regard to lignite binder free high pressure roller forming technique, 4 designed and developed set HPU140-100 high pressure pair
Roller molding machine.In October, 2009, in Filter Tuber For Clean Coal company, Hulun Buir Shenhua (hereinafter referred to as Shenhua Filter Tuber For Clean Coal), band is negative for the first time
Lotus test run.By constantly perfect to Processes and apparatus, which smoothly completes " 168 " in August, 2012 finally
Continuous on-load test running, meet continuous production condition.The process system using flue gas by water content 35% or more it is brown
Coal is dehydrated, is dried, and be sent into high-voltage double-roller forming machine carry out binder free molding, by upgrading, it is hot-forming after type
Coal, cold pressing strength > 3000N/, calorific value reaches 21840J/kg (5200cal/kg) or more, and single ball density is 1.25-
1.4g/cm3.Key equipment HPU140-100 high-voltage double-roller forming machine production capacity is 25-30t/h, is to be used for both at home and abroad at present
The molding maximum specification roller briquetting machine of lignite binder free.
Currently, there is a variety of low-order coals to form upgrading technology both at home and abroad, various technologies respectively have advantage and disadvantage.It is especially domestic
Prior art device mostly have that safety is poor, dehydration efficiency is low, weary Steam Recovery rate is low, energy waste is serious, cost mistake
The problems such as high.In addition, there are part contradictions, such as in drying technology: taking enthalpy of moist air, lignite dehydration rate and weary steam
The contradiction of the water rate of recovery；The contradiction etc. of lignite dehydration rate and binder free forming technique need to pass through the system integration, reasonably optimizing solution
Certainly.
Summary of the invention
The object of the present invention is to provide using waste heat flue gas carry out low-order coal pulverized coal forming upgrading system and method for upgrading,
Solve that low-order coal upgrading safety is poor, Energy Efficiency Ratio is low, water cannot recycle, list covering device yield is small, the energy is unrestrained in dry steam exhaust
Take, cost is excessively high, it is dry after product it is not readily transportable the problems such as.
To achieve the above object, the present invention adopts the following technical scheme: one aspect of the present invention provides a kind of scientific arrangement conjunction
The upgrading system that low-order coal pulverized coal forming is carried out using waste heat flue gas of reason, the upgrading system includes feeder, flue gas tubular type
Drying machine, filter cartridge dust remover, recyclable device, desulfurizer, coal dust storage tank, precompressed exhaust apparatus and dry coal dust molding machine；It gives
The raw coal bucket for adding raw coal is provided at the top of coal machine, feeder bottom is connected by the feeding inlet of pipeline and flue gas pipe drier
It is logical；The top of flue gas pipe drier is provided with dry steam exhaust outlet, and the cigarette that has surplus heat is arranged in the lower part of flue gas pipe drier
Gas inlet port, flue gas pipe drier bottom are provided with the discharge bucket for dry coal dust to be discharged, and discharge bucket is by pipeline and in advance
Feeding inlet connection at the top of pressure device of air；
Dry steam exhaust outlet is connected to by pipeline with the air inlet of filter cartridge dust remover, the gas discharge outlet at the top of filter cartridge dust remover
Filtered gas is sent into the import of recyclable device by pipeline, the outlet of recyclable device passes through pipeline for filtered gas
Body is sent into the import of desulfurizer, and the outlet of desulfurizer is connected to by pipeline with chimney；
The pulverized coal particle filtered out is sent into the entrance of coal dust tank top, coal dust bottom of storage tank by pipeline by the bottom of filter cartridge dust remover
The outlet in portion is by branch pipe and the pipeline connection at the top of discharge bucket and precompressed exhaust apparatus between feeding inlet is arranged in；Precompressed exhaust
The discharge port of bottom of device is connected to by pipeline with the feeding inlet of dry coal dust molding machine, and dry coal dust molding machine bottom is provided with
Outlet.
Further, air-introduced machine is additionally provided on the pipeline between the outlet of recyclable device and the import of desulfurizer.
Further, the drying coal powder size of flue gas pipe drier bottom discharge is 2 mm -3mm, and temperature is 60 DEG C, is contained
Water 7%.
Further, precompressed exhaust apparatus and the moisture-free coal grain graininess of dry coal dust molding machine discharge are 30 mm-35mm,
Water content is 5-10%.
Further, recyclable device is indirect tubular heat exchanger.
Further, raw coal (low-order coal) is lignite or jet coal or dross coal or weakly caking coal.
Further, raw coal size 6mm-10mm, water content 43%.
It further, is 98 DEG C -105 DEG C from the drying steam exhaust temperature that dry steam exhaust outlet is discharged；Dry the aqueous of steam exhaust
Amount is 20-25%.
Further, the temperature of waste heat flue gas is 400-420 DEG C.
Another aspect of the present invention provides the method for upgrading that the upgrading system of low-order coal pulverized coal forming is carried out using waste heat flue gas,
Specific step is as follows:
Step 1, raw coal by coal conveyer belt are delivered to raw coal bucket after being crushed to 6mm-10mm from heap coal yard, will be former by feeder
Coal is quantitatively delivered to flue gas pipe drier；
Step 2, in flue gas pipe drier, raw coal and station boiler waste heat flue gas carry out adverse current indirect heat exchange, and raw coal is dry
The drying steam exhaust that process generates, from the drying steam exhaust outlet discharge at the top of flue gas pipe drier；The dry moisture-free coal generated
Powder is discharged by the discharge bucket of flue gas pipe drier bottom；
Step 3, dry steam exhaust outlet are connected to by pipeline with the air inlet of filter cartridge dust remover, and in filter cartridge dust remover into
The separation of row dry steam exhaust and pulverized coal particle；Clean dried steam exhaust after separation at the top of filter cartridge dust remover by being discharged, the coal filtered out
Powder particles are by filter cartridge dust remover bottom discharge to coal dust storage tank；Clean drying steam exhaust is discharged by the gas at the top of filter cartridge dust remover
Mouth is sent into the import of recyclable device by pipeline；
Step 4, recyclable device use the mode of twin-stage cooling water condensation by the vapor in dry steam exhaust finally with liquid water
Form recycling；The fixed gas of recyclable device tail portion discharge is emitted into atmosphere under the action of air-introduced machine；
Step 5, the dry drying coal dust generated fall into precompressed exhaust by pipeline by the discharge bucket of flue gas pipe drier bottom
It in device, and carries out and compresses in precompressed exhaust apparatus, the exhaust gas that compression process generates is discharged to atmosphere；
Step 6 carries out roll-forming into dry coal dust molding machine by the drying coal dust of precompressed exhaust apparatus precompressed,
Dry coal dust molding machine bottom is provided with the outlet for collecting shaping and drying coal particle finished product.
Further, exhaust gas includes air and flue gas (predominantly air contains a small amount of flue gas).
The beneficial effects of the present invention are embodied in:
1, the upgrading system and method for upgrading provided by the invention that low-order coal pulverized coal forming is carried out using waste heat flue gas, upgrading system
Scientific arrangement is reasonable, and system safety in operation is high, and Energy Efficiency Ratio is high, and list covering device yield is big, construction and operating cost bottom.Pre- pressure
Device of air and the moisture-free coal grain graininess of dry coal dust molding machine discharge are 30 mm-35mm, can recycle drying in a liquid-like manner
Water in steam exhaust, and the low-order coal of different degree of dryings is obtained as needed.
2, the upgrading system and method for upgrading provided by the invention that low-order coal pulverized coal forming is carried out using waste heat flue gas, system
Weary jet chimney establishes negative pressure, and smoke abatement air-tube type drying machine is outside opening-type equipment, and technique all devices, pipeline are closed, have
The case where effect prevents air from entering system, and oxygen content is low, avoids the occurrence of dry coal spontaneous combustion.
3, the upgrading system and method for upgrading provided by the invention that low-order coal pulverized coal forming is carried out using waste heat flue gas, by two
Grade water recovery device is coupled with the raw coal molding process for upgrading of raw coal drying, binder free high pressure roll-forming, and that produces is dry
Dry coal particle is convenient for long-distance transportation in the presence of a harsh environment, opens new platform for the comprehensive utilization of China's low-order coal, simultaneously should
System has also recycled the partial moisture in raw coal in raw coal drying process, and having saved water resource is real environmentally protective work
Skill.
Other features and advantages of the present invention will be illustrated in the following description, and partly becomes from specification
It is clear that understand through the implementation of the invention.The main object of the present invention and further advantage can be by specifications, power
Specifically noted scheme is achieved and obtained in sharp claim.
Detailed description of the invention
The present invention will be further described in detail with reference to the accompanying drawing.
Fig. 1 is the upgrading system schematic diagram provided by the invention that low-order coal pulverized coal forming is carried out using waste heat flue gas.
Appended drawing reference: 1- raw coal bucket, 2- feeder, 3- flue gas pipe drier, 4- filter cartridge dust remover, 5- recyclable device,
6- desulfurizer, 7- coal dust storage tank, 8- precompressed exhaust apparatus, 9- dry coal dust molding machine, 10- branch pipe, 11- chimney, 12- air inducing
Machine, 13- waste heat flue gas inlet port.
Specific embodiment
Carry out the technical solution that the present invention will be described in detail by the following examples, embodiment below is only exemplary,
It is only capable of for explanation and illustration technical solution of the present invention, and the limitation to technical solution of the present invention cannot be construed to.
As shown in Figure 1, one aspect of the present invention provides the upgrading system for carrying out low-order coal pulverized coal forming using waste heat flue gas, institute
Stating upgrading system includes feeder 2, flue gas pipe drier 3, filter cartridge dust remover 4, recyclable device 5, desulfurizer 6, coal dust storage
Tank 7, precompressed exhaust apparatus 8 and dry coal dust molding machine 9；The raw coal bucket 1 for adding raw coal, feeder 2 are provided at the top of feeder 2
Bottom is connected to by pipeline with the feeding inlet of flue gas pipe drier 3.Wherein, it should be controlled into the raw coal size of system
6mm-10mm, water content 43%, raw coal can be lignite or jet coal or dross coal or weakly caking coal.
The top of flue gas pipe drier 3 is provided with dry steam exhaust outlet, and 3 lower part of flue gas pipe drier is provided with remaining
Hot fume inlet port 13,3 bottom of flue gas pipe drier are provided with the discharge bucket for dry coal dust to be discharged, and discharge bucket passes through pipe
Road is connected to the feeding inlet at 8 top of precompressed exhaust apparatus.The drying coal powder size of 3 bottom of flue gas pipe drier discharge is 2
Mm-3mm, temperature are 60 DEG C, water content 7%.
Dry steam exhaust outlet be connected to by pipeline with the air inlet of filter cartridge dust remover 4, dry steam exhaust temperature be 98 DEG C-
105℃；The water content of dry steam exhaust is 20-25%.The gas discharge outlet at 4 top of filter cartridge dust remover will be filtered by pipeline
Gas is sent into the import of recyclable device 5, and filtered gas is sent into desulfurizer 6 by pipeline by the outlet of recyclable device 5
Import in, the outlet of desulfurizer 6 is connected to by pipeline with chimney 11.The outlet of recyclable device 5 and the import of desulfurizer 6
Between pipeline on be additionally provided with air-introduced machine 12.
The pulverized coal particle filtered out is sent into the entrance at 7 top of coal dust storage tank, coal dust by pipeline by the bottom of filter cartridge dust remover 4
The outlet of 7 bottom of storage tank is connected by branch pipe 10 and the pipeline being arranged between 8 top feeding inlet of discharge bucket and precompressed exhaust apparatus
It is logical；The discharge port of 8 bottom of precompressed exhaust apparatus is connected to by pipeline with the feeding inlet of dry coal dust molding machine 9, dry coal dust at
9 bottom of type machine is provided with outlet, and the moisture-free coal grain graininess of discharge is 30 mm-35mm, water content 5-10%.
The method for upgrading of the above-mentioned upgrading system that low-order coal pulverized coal forming is carried out using waste heat flue gas, the specific steps are as follows:
Step 1, raw coal by coal conveyer belt are delivered to raw coal bucket 1 after being crushed to 6mm-10mm from heap coal yard, will by feeder 2
Raw coal is quantitatively delivered to flue gas pipe drier 3 by raw coal bucket 1；
Step 2, raw coal can occur when dry in flue gas pipe drier 3 from phenomenon of bursting apart, raw coal and station boiler waste heat cigarette
Gas carries out adverse current indirect heat exchange, and (waste heat flue gas and raw coal carry out adverse current indirect heat exchange, can be by adjusting the initial of waste heat flue gas
Temperature and tolerance carry out the degree of drying of controlling product), the drying steam exhaust that raw coal drying process generates, at the top of air-tube type drying machine
The discharge of drying steam exhaust outlet, temperature is about 100 DEG C, and dry steam exhaust water content is about 20-25%.The dry moisture-free coal generated
Powder is discharged by the discharge bucket of 3 bottom of flue gas pipe drier, and granularity is about 2-3mm, and temperature is about 60 DEG C, water content 7%.
Step 3, dry steam exhaust outlet are connected to by pipeline with the air inlet of filter cartridge dust remover 4, and in filter cartridge dust remover 4
The separation of steam exhaust Yu tiny pulverized coal particle is dried, it is dry that filter cartridge dust remover 4 can dispel the overwhelming majority in dry steam exhaust
Pulverized coal particle；Clean dried steam exhaust after separation at the top of filter cartridge dust remover 4 by being discharged, and the pulverized coal particle filtered out is by filter cartridge dust remover
4 bottom discharges are to coal dust storage tank 7；Clean drying steam exhaust is sent by the gas discharge outlet at 4 top of filter cartridge dust remover by pipeline
In the import of recyclable device 5；
Step 4, recyclable device 5 are indirect tubular heat exchanger.The connection of cold source primary side feedwater piping is pumped out from power plant condensation water
Mouthful, outlet temperature is 65 DEG C；The connection of cold source secondary side feedwater piping is exported from power plant's enclosed cooling water pump, outlet temperature 30
℃.5 bottom of recyclable device is additionally provided with the discharge outlet for the outflow of steam exhaust condensate.Recyclable device 5 is made using resistant material.
The mode of twin-stage cooling water condensation is used finally to recycle the vapor in dry steam exhaust in the form of liquid water；It returns
The fixed gas of 5 tail portion of receiving apparatus discharge is emitted into atmosphere under the action of air-introduced machine 12, and fixed gas delivery temperature is about 45 DEG C, no
Solidifying gas water content is about 9.5%；Imperial source water recovery device 5 can recycle in dry steam exhaust about 60% moisture.
Step 5, the dry drying coal dust generated are fallen by the discharge bucket of 3 bottom of flue gas pipe drier by pipeline pre-
In pressure device of air 8, and precommpression is carried out in precompressed exhaust apparatus 8.The exhaust gas that compression process generates is discharged to atmosphere, exhaust gas
It is made of air and flue gas.
Step 6 is rolled by the drying coal dust of 8 precompressed of precompressed exhaust apparatus into dry coal dust molding machine 9
Type is provided with the outlet for collecting shaping and drying coal particle finished product in dry 9 bottom of coal dust molding machine.Dry coal dust passes through
Moisture-free coal grain graininess after precompressed exhaust apparatus 8 and dry 9 roll-forming of coal dust molding machine is about 30-35mm.
The upgrading system and method for upgrading provided by the invention that low-order coal pulverized coal forming is carried out using waste heat flue gas, the system
Safety in operation is high, and Energy Efficiency Ratio is high；Waste heat flue gas and raw coal carry out adverse current indirect heat exchange, the dry drying steam exhaust and drying generated
Coal dust is discharged from the top and bottom of flue gas pipe drier respectively.System can be recycled in a liquid-like manner in most of dry steam exhaust
Water；List covering device yield is big；Construction is highly stable suitable for disliking with the product structure characteristic after operating cost bottom, drying and moulding
The transport of relatively long distance under bad environment.
The foregoing is merely the preferable specific embodiments of the present invention, but scope of protection of the present invention is not limited thereto,
The change or replacement that anyone skilled in the art is expected in the technical scope disclosed by the present invention should all be contained
Lid is within protection scope of the present invention.
Claims (10)
1. carrying out the upgrading system of low-order coal pulverized coal forming using waste heat flue gas, it is characterised in that: the upgrading system includes giving
Coal machine (2), flue gas pipe drier (3), filter cartridge dust remover (4), recyclable device (5), desulfurizer (6), coal dust storage tank (7),
Precompressed exhaust apparatus (8) and drying coal dust molding machine (9)；It is provided with the raw coal bucket (1) for adding raw coal at the top of feeder (2), is given
Coal machine (2) bottom is connected to by pipeline with the feeding inlet of flue gas pipe drier (3)；The top of flue gas pipe drier (3) is set
It is equipped with dry steam exhaust outlet, the lower part setting of flue gas pipe drier (3) has surplus heat flue gas inlet port (13), and flue gas tubular type is dry
Dry machine (3) bottom is provided with the discharge bucket for dry coal dust to be discharged, and discharge bucket passes through pipeline and precompressed exhaust apparatus (8) top
Feeding inlet connection；
Dry steam exhaust outlet is connected to by pipeline with the air inlet of filter cartridge dust remover (4), the gas at the top of filter cartridge dust remover (4)
Filtered gas is sent into the import of recyclable device (5) by outlet by pipeline, and the outlet of recyclable device (5) passes through pipeline
Filtered gas is sent into the import of desulfurizer (6), the outlet of desulfurizer (6) is connected by pipeline and chimney (11)
It is logical；
The pulverized coal particle filtered out is sent into the entrance at the top of coal dust storage tank (7), coal dust by pipeline by the bottom of filter cartridge dust remover (4)
The outlet of storage tank (7) bottom is by branch pipe (10) and setting between discharge bucket and precompressed exhaust apparatus (8) top feeding inlet
Pipeline connection；The discharge port of precompressed exhaust apparatus (8) bottom is connected to by pipeline with the feeding inlet of dry coal dust molding machine (9),
Dry coal dust molding machine (9) bottom is provided with outlet.
2. the upgrading system of low-order coal pulverized coal forming is carried out using waste heat flue gas as described in claim 1, which is characterized in that return
Air-introduced machine (12) are additionally provided on pipeline between the outlet of receiving apparatus (5) and the import of desulfurizer (6).
3. the upgrading system of low-order coal pulverized coal forming is carried out using waste heat flue gas as described in claim 1, which is characterized in that cigarette
The drying coal powder size of air-tube type drying machine (3) bottom discharge is 2 mm -3mm, and temperature is 60 DEG C, water content 7%.
4. the upgrading system of low-order coal pulverized coal forming is carried out using waste heat flue gas as described in claim 1, which is characterized in that pre-
Pressure device of air (8) and the moisture-free coal grain graininess of dry coal dust molding machine (9) discharge are 30 mm-35mm, water content 5-
10%。
5. the upgrading system of low-order coal pulverized coal forming is carried out using waste heat flue gas as described in claim 1, which is characterized in that return
Receiving apparatus (5) is indirect tubular heat exchanger.
6. the upgrading system of low-order coal pulverized coal forming is carried out using waste heat flue gas as described in claim 1, which is characterized in that former
Coal is lignite or jet coal or dross coal or weakly caking coal.
7. the upgrading system of low-order coal pulverized coal forming is carried out using waste heat flue gas as described in claim 1, which is characterized in that former
Coal particle size is 6mm-10mm, water content 43%.
8. the upgrading system of low-order coal pulverized coal forming is carried out using waste heat flue gas as described in claim 1, which is characterized in that from
The drying steam exhaust temperature of dry steam exhaust outlet discharge is 98 DEG C -105 DEG C；The water content of dry steam exhaust is 20-25%.
9. the upgrading system for carrying out low-order coal pulverized coal forming using waste heat flue gas as described in any one of claim 1-8
Method for upgrading, which is characterized in that specific step is as follows:
Step 1, raw coal by coal conveyer belt are delivered to raw coal bucket (1) after being broken from heap coal yard, are determined raw coal by feeder (2)
It is delivered to flue gas pipe drier (3) to amount；
Step 2, in flue gas pipe drier (3), raw coal and station boiler waste heat flue gas carry out indirect counterflow heat exchange, raw coal
The drying steam exhaust that drying process generates, from the drying steam exhaust outlet discharge at the top of flue gas pipe drier (3)；Dry generation
Dry coal dust is discharged by the discharge bucket of flue gas pipe drier (3) bottom；
Step 3, dry steam exhaust outlet are connected to by pipeline with the air inlet of filter cartridge dust remover (4), and in filter cartridge dust remover
(4) steam exhaust and the separation of pulverized coal particle is dried in；Clean dried steam exhaust after separation at the top of filter cartridge dust remover (4) by arranging
Out, the pulverized coal particle filtered out is by filter cartridge dust remover (4) bottom discharge to coal dust storage tank (7)；Clean drying steam exhaust is removed by filter cylinder
Gas discharge outlet at the top of dirt device (4) is sent into the import of recyclable device (5) by pipeline；
Step 4, recyclable device (5) use the mode of twin-stage cooling water condensation by the vapor in dry steam exhaust finally with liquid
The form of water recycles；The fixed gas of recyclable device (5) tail portion discharge is emitted into atmosphere under the action of air-introduced machine (12)；
Step 5, the dry drying coal dust generated fall into precompressed by pipeline by the discharge bucket of flue gas pipe drier (3) bottom
It in exhaust apparatus (8), and carries out and compresses in precompressed exhaust apparatus (8), the exhaust gas that compression process generates is discharged to atmosphere；
Step 6 is rolled by the drying coal dust of precompressed exhaust apparatus (8) precompressed into dry coal dust molding machine (9)
Type is provided with the outlet for collecting shaping and drying coal particle finished product in dry coal dust molding machine (9) bottom.
10. the method for upgrading of the upgrading system of low-order coal pulverized coal forming is carried out using waste heat flue gas as described in claim 9,
It is characterized in that, exhaust gas includes air and flue gas in step 5.
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