CN209383725U - The upgrading system of low-order coal pulverized coal forming is carried out using waste heat flue gas - Google Patents

Abstract

The utility model discloses the upgrading system for carrying 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

The upgrading system of low-order coal pulverized coal forming is carried out using waste heat flue gas

Technical field

The utility model relates to Coal dressing technical field of comprehensive utilization, carry out low-order coal coal especially with waste heat flue gas The molding upgrading system of powder.

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.

Utility model content

The purpose of the utility model is to provide the upgrading systems that low-order coal pulverized coal forming is carried out using waste heat flue gas, to solve Low-order coal upgrading safety is poor, Energy Efficiency Ratio is low, water cannot recycle, list covering device yield is small, energy waste, cost in dry steam exhaust The problems such as product is not readily transportable after excessively high, dry.

To achieve the above objectives, the present invention adopts the following technical solutions: the utility model provides a kind of scientific arrangement The reasonable upgrading system that low-order coal pulverized coal forming is carried out using waste heat flue gas, the upgrading system includes feeder, fume pipe Formula drying machine, 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 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 row at the top of filter cartridge dust remover Filtered gas is sent into the import of recyclable device by outlet by pipeline, after the outlet of recyclable device will be filtered by pipeline Gas be sent into the import of desulfurizer, 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 storage by pipeline by the bottom of filter cartridge dust remover The outlet of pot bottom 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 The discharge port of exhaust apparatus bottom is connected to by pipeline with the feeding inlet of dry coal dust molding machine, and dry coal dust molding machine bottom is set It is equipped with outlet.

Further, weary flue gas discharge opening is provided with immediately below dry steam exhaust 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.

The beneficial effects of the utility model are embodied in:

1, the upgrading system provided by the utility model that low-order coal pulverized coal forming is carried out using waste heat flue gas, upgrading system cloth Office is scientific and 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.Precompressed exhaust Device and the moisture-free coal grain graininess of dry coal dust molding machine discharge are 30 mm-35mm, and it is weary can to recycle drying in a liquid-like manner Water in vapour, and the low-order coal of different degree of dryings is obtained as needed.

2, the upgrading system provided by the utility model that low-order coal pulverized coal forming is carried out using waste heat flue gas, the weary steam of system Pipeline establishes negative pressure, and smoke abatement air-tube type drying machine is outside opening-type equipment, and technique all devices, pipeline are closed, effectively prevent The case where air enters system, and oxygen content is low, avoids the occurrence of dry coal spontaneous combustion.

3, the upgrading system provided by the utility model that low-order coal pulverized coal forming is carried out using waste heat flue gas is returned two-stage water Receiving apparatus is coupled with the raw coal molding process for upgrading of raw coal drying, binder free high pressure roll-forming, the moisture-free coal produced Grain 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, while the system exists To the partial moisture also recycled in raw coal in raw coal drying process, having saved water resource is real environmentally protective technique.

Other features and advantages of the utility model will illustrate in the following description, and partly from specification It becomes apparent, or is understood and implementing the utility model.The main purpose and further advantage of the utility model can lead to Specifically noted scheme in specification, claims is crossed to be achieved and obtained.

Detailed description of the invention

The utility model is described in more detail with reference to the accompanying drawing.

Fig. 1 is the upgrading system schematic diagram provided by the utility model 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

The technical solution of the utility model is described in detail by the following examples, embodiment below is only exemplary , it is only capable of for explanation and illustration the technical solution of the utility model, and cannot be construed to technical solutions of the utility model Limitation.

As shown in Figure 1, on the one hand the utility model provides the upgrading system for carrying out low-order coal pulverized coal forming using waste heat flue gas System, the upgrading system includes feeder 2, flue gas pipe drier 3, filter cartridge dust remover 4, recyclable device 5, desulfurizer 6, coal Powder storage tank 7, precompressed exhaust apparatus 8 and dry coal dust molding machine 9；It is provided with the raw coal bucket 1 for adding raw coal at the top of feeder 2, gives 2 bottom of coal machine 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 System can be lignite or jet coal or dross coal or weakly caking coal in 6mm-10mm, water content 43%, raw coal.

The top of flue gas pipe drier 3 is provided with dry steam exhaust outlet and (is provided with immediately below dry steam exhaust outlet Weary flue gas discharge opening), the flue gas inlet port 13 that has surplus heat is arranged in 3 lower part of flue gas pipe drier, and 3 bottom of flue gas pipe drier is set It is equipped with the discharge bucket for dry coal dust to be discharged, discharge bucket is connected to by pipeline with the feeding inlet at 8 top of precompressed exhaust apparatus.Cigarette The drying coal powder size of 3 bottom of air-tube type drying machine discharge is 2 mm-3mm, and temperature is 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 is delivered to raw coal bucket 1 after being crushed to 6mm-10mm from heap coal yard, by feeder Raw coal is quantitatively delivered to flue gas pipe drier 3 by raw coal bucket 1 by 2；

Step 2, raw coal can occur when dry in flue gas pipe drier 3 from phenomenon of bursting apart, more than raw coal and station boiler Hot fume 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 waste heat flue gas Initial temperature and tolerance carry out the degree of drying of controlling product), the drying steam exhaust that raw coal drying process generates, from air-tube type drying machine The drying steam exhaust outlet at top is discharged, and temperature is about 100 DEG C, and dry steam exhaust water content is about 20-25%.Dry generation is done Dry coal dust 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 The separation of steam exhaust Yu tiny pulverized coal particle is dried in 4, filter cartridge dust remover 4 can dispel the overwhelming majority in dry steam exhaust Dry pulverized coal particle；By being discharged at the top of filter cartridge dust remover 4, the pulverized coal particle filtered out is removed by filter cylinder for clean dried steam exhaust after separation 4 bottom discharge of dirt device is to coal dust storage tank 7；Clean drying steam exhaust passes through pipeline by the gas discharge outlet at 4 top of filter cartridge dust remover It is sent into the import of recyclable device 5；

Step 4, recyclable device 5 are indirect tubular heat exchanger.Cold source primary side feedwater piping is connected from power plant condensation water pump Outlet, outlet temperature are 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 provided by the utility model that low-order coal pulverized coal forming is carried out using waste heat flue gas, system operation peace Quan Xinggao, Energy Efficiency Ratio are high；Waste heat flue gas and raw coal carry out adverse current indirect heat exchange, the dry drying steam exhaust generated and dry coal dust point It is not discharged from the top and bottom of flue gas pipe drier.System can recycle the water in most of dry steam exhaust in a liquid-like manner； List covering device yield is big；Construction is highly stable suitable in severe ring with the product structure characteristic after operating cost bottom, drying and moulding The transport of relatively long distance under border.

The foregoing is merely the preferable specific embodiment of the utility model, but the protection scope of the utility model not office Be limited to this, variation that anyone skilled in the art is expected within the technical scope disclosed by the utility model or Replacement, should be covered within the scope of the utility model.

Claims (8)

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%.