CN104930535A - Integrated direct-fired pulverizing system with coal drying and water recovery functions - Google Patents
Integrated direct-fired pulverizing system with coal drying and water recovery functions Download PDFInfo
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- CN104930535A CN104930535A CN201510320435.9A CN201510320435A CN104930535A CN 104930535 A CN104930535 A CN 104930535A CN 201510320435 A CN201510320435 A CN 201510320435A CN 104930535 A CN104930535 A CN 104930535A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an integrated direct-fired pulverizing system with coal drying and water recovery functions. The integrated direct-fired pulverizing system comprises a water recovery subsystem and a pulverizing subsystem, the water recovery subsystem comprises a coal bunker, a dryer and a water recovery heat exchanger, the dryer comprises a dryer coal inlet, a dryer gas outlet and a dryer solid outlet, the dryer coal inlet is communicated with an outlet of the coal bunker, and the water recovery heat exchanger is communicated with the dryer gas outlet. The pulverizing subsystem comprises a medium-speed mill direct-fired pulverizing device, and the water recovery subsystem is close to the pulverizing subsystem. Water in brown coal is recycled, a drying device and an original pulverizing system of a power plant are integrated, long-distance dry pulverized coal transportation is omitted, the integrated direct-fired pulverizing system is safer and more reliable, and the investment cost of the pulverizing system, a flue gas and air system and a boiler of the power plant is correspondingly reduced. Dry coal directly enters a coal mill through a coal feeder, a middle coal bunker is omitted, and hidden danger is effectively eliminated.
Description
Technical field
The invention belongs to electric power energy technical field, particularly relate to a kind of integral type unit pulverized-coal system with coal drying and Water Sproading function.
Background technology
The pulverized coal preparation system of industrial use can be divided into two classes: traditional enclosed brown coal pulverized coal preparation system and open type pulverized coal preparation system.Enclosed pulverized coal preparation system refer to draw from coal pulverizer through mill separator the gas carrying qualified fineness coal dust, powder two-phase fluid as First air, be directly blown into the pulverized coal preparation system of burner hearth via burner.Large-scale boiler using brown coal is for safe powder process and the consideration reducing coal-grinding power consumption, generally select fan mill or medium-speed milling pulverization system, no matter be the enclosed pulverized coal preparation system that medium-speed pulverizer pressurized direct pulverizing coal system or blower mill unit pulverized-coal system all belong to traditional, having common shortcoming is when combusting brown coal, be no matter First air containing a large amount of inertia flue gases and water vapour or the tertiary air weary for powder process gas blowout being entered burner hearth, all can cause burner hearth smooth combustion and have a strong impact on.Weary gas after open type pulverized coal preparation system refers in pulverized coal preparation system and isolates coal dust does not enter burner hearth, and is discharged into the pulverized coal preparation system in the flue before air or air-introduced machine after being through bag-type dust.
The eastern area of Inner Mongolia that China's brown coal are concentrated the most is typical " rich coal lack of water " area, and water resources shortage seriously constrains local power supply construction of base and economic development.Many research is in recent years reclaimed for boiler exhaust gas UTILIZATION OF VESIDUAL HEAT IN and steam.Bituminous coal fired boiler flue gas water dew point is at about 40 DEG C, and for the boiler using brown coal flue gas water dew point containing a large amount of steam also only at about 55 DEG C, but general boiler discharging flue gas acid dew point is then more than 80 DEG C.Therefore, although water content is huge in flue gas, by heat exchanger materials corrosion restriction, smoke discharging residual heat utilizes the part sensible heat only reclaimed in flue gas, and moisture does not then reclaim substantially.But, in high water content brown coal boiler open type pulverized coal preparation system, overwhelming majority raw coal moisture is evaporated in powder process dry run, a large amount of water vapour is enriched with in dry exhaust steam, exhaust steam water dew point up to about 75 DEG C and hardly acid gas-containing, make a large amount of brown coal drying water of recovery become possibility, environmental benefit is remarkable.
Summary of the invention
The object of this invention is to provide a kind of integral type unit pulverized-coal system with coal drying and Water Sproading function, be not recovered in pulverizing process with the moisture solved in coal raw material, the technical problem of water resource waste.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of integral type unit pulverized-coal system with coal drying and Water Sproading function, is made up of Water Sproading subsystem and powder process subsystem;
Described Water Sproading subsystem comprises:
Coal bunker, described coal bunker comprises coal bunker outlet, and coal bunker is for loading coal raw material;
Drying machine, described drying machine comprises drying machine coal feed point, drying machine gas vent, drying machine solid outlet; Drying machine coal feed point and coal bunker export to be connected;
Water Sproading heat exchanger, described Water Sproading heat exchanger and drying machine gas vent are connected, for being made the condensate moisture in the weary steam of self-desiccation machine gas vent in the future by cooling medium and reclaiming;
Described powder process subsystem comprises medium-speed pulverizer blowing powder producing equipment, and for future, the coal Raw material processing of self-desiccation machine solid outlet becomes coal dust and coal dust is blown into boiler; Described Water Sproading subsystem and powder process subsystem are pressed close to arrange.
The present invention has the integral type unit pulverized-coal system of coal drying and Water Sproading function as above, and further, described Water Sproading subsystem also comprises deduster, dedusting air-introduced machine and chimney; Described deduster is arranged between described drying machine gas vent and Water Sproading heat exchanger; Described dedusting air-introduced machine is arranged on the gas outlet of described Water Sproading heat exchanger; Described chimney is communicated with dedusting air-introduced machine.
The present invention has the integral type unit pulverized-coal system of coal drying and Water Sproading function as above, further, described Water Sproading heat exchanger comprises one-level Water Sproading heat exchanger and secondary Water Sproading heat exchanger, and described one-level Water Sproading heat exchanger and secondary Water Sproading heat exchanger are connected in series.
The present invention has the integral type unit pulverized-coal system of coal drying and Water Sproading function as above, further, passes into the cooling medium of the first temperature, pass into the cooling medium of the second temperature in secondary Water Sproading heat exchanger in described one-level Water Sproading heat exchanger.
The present invention has the integral type unit pulverized-coal system of coal drying and Water Sproading function as above, and further, described coal raw material is the precrushing brown coal of particle diameter <20mm.
The present invention has the integral type unit pulverized-coal system of coal drying and Water Sproading function as above, and further, described powder process subsystem comprises:
Mill separator, described mill separator comprises mill separator charging aperture and mill separator discharge;
Medium-speed pulverizer, described medium-speed pulverizer comprises medium-speed pulverizer charging aperture, medium-speed pulverizer First air air inlet, medium-speed pulverizer sealing air air inlet; Mill separator discharge and medium-speed pulverizer charging aperture are interconnected;
Feeder, moulded coal is sent to mill separator charging aperture by described feeder;
Boiler, to mix with coal dust at described pot furnace air and carries out Thorough combustion;
Air preheater, described air preheater is arranged on described boiler;
Burner, described burner comprises burner inlet and burner outlet; Burner outlet is communicated with the entrance of boiler;
Pulverized coal distributor and isolation door, described mill separator discharge, pulverized coal distributor, isolation door are communicated with successively with burner inlet;
Pressure fan, it is combustion-supporting that the Secondary Air that described pressure fan exports enters burner inlet after air preheater heating;
Primary air fan, the wind that described primary air fan exports enters medium-speed pulverizer air inlet after air preheater heating.
The present invention has the integral type unit pulverized-coal system of coal drying and Water Sproading function as above, and further, also comprise apparatus for measuring air quantity, described apparatus for measuring air quantity is arranged on medium-speed pulverizer air inlet, for measuring air quantity.
The present invention has the integral type unit pulverized-coal system of coal drying and Water Sproading function as above, and further, described powder process subsystem also comprises secondary air box, and described secondary air box is connected with burner inlet, poor for regulating stove gun pressure.
The present invention has the integral type unit pulverized-coal system of coal drying and Water Sproading function as above, and further, described powder process subsystem also comprises deduster and air-introduced machine, and the entrance of deduster is communicated with the exhanst gas outlet of boiler, and outlet is communicated with described air-introduced machine.
The present invention has the integral type unit pulverized-coal system of coal drying and Water Sproading function as above, and further, described powder process subsystem also comprises seal fan, and described seal fan is communicated with medium-speed pulverizer, for anti-leak-stopping powder.
The invention has the beneficial effects as follows:
Drying process of the present invention can realize depth drying, below brown coal drying to 5% moisture.
The original pulverized coal preparation system of drying equipment of the present invention and power plant integrates, and without the need to long distance transportation coal dust, more safe and reliable, cost of investment is corresponding reduction also.Moisture-free coal directly enters coal pulverizer by feeder, and without middle coal bunker, effectively eliminate danger hidden danger.Depth drying coal can continue to reduce pulverized coal preparation system and exert oneself, and increases boiler combustion efficiency, reduces operating cost.
Accompanying drawing explanation
By detailed description done in conjunction with the following drawings, above-mentioned and/or other aspects of the present invention and advantage will become clearer and be easier to understand, and these accompanying drawings just schematically, do not limit the present invention, wherein:
Fig. 1 is the integral type unit pulverized-coal system overall schematic with coal drying and Water Sproading function of an embodiment of the present invention;
Fig. 2 is the Water Sproading subsystem schematic diagram of an embodiment of the present invention;
Fig. 3 is the powder process subsystem schematic diagram of an embodiment of the present invention.
In accompanying drawing, the list of parts representated by each label is as follows:
10, Water Sproading subsystem, 11, coal bunker, 12, drying machine, 13, Water Sproading heat exchanger, 131, one-level Water Sproading heat exchanger, 132, secondary Water Sproading heat exchanger, 15, deduster, 16, dedusting air-introduced machine, 17, chimney, 20, powder process subsystem, 21, mill separator, 22, medium-speed pulverizer, 23, feeder, 24, boiler, 25, air preheater, 26, burner, 27, pulverized coal distributor, 28, isolation door, 29, pressure fan, 31, primary air fan, 33, secondary air box, 34, deduster, 35, air-introduced machine, 36, seal fan, 37, apparatus for measuring air quantity, 4, building.
Detailed description of the invention
Hereinafter, the embodiment with the integral type unit pulverized-coal system of coal drying and Water Sproading function of the present invention is described with reference to the accompanying drawings.
The embodiment recorded at this is specific detailed description of the invention of the present invention, for illustration of design of the present invention, is all explanatory and exemplary, should not be construed as the restriction to embodiment of the present invention and the scope of the invention.Except the embodiment recorded at this, those skilled in the art can also adopt other technical scheme apparent based on the content disclosed in the application's claims and description, and these technical schemes comprise the technical scheme making any apparent substitutions and modifications adopted the embodiment recorded at this.
The accompanying drawing of this description is schematic diagram, and aid illustration design of the present invention schematically shows shape and the correlation thereof of each several part.Note that the structure of each parts for the ease of clearly showing the embodiment of the present invention, not according to identical scale between each accompanying drawing.Identical reference marker is for representing identical part.
Fig. 1 illustrates the integral type unit pulverized-coal system with coal drying and Water Sproading function of an embodiment of the present invention, is made up of Water Sproading subsystem 10 and powder process subsystem 20;
Described Water Sproading subsystem 10 comprises:
Coal bunker 11, described coal bunker comprises coal bunker outlet, and coal bunker is for loading coal raw material;
Drying machine 12, described drying machine comprises drying machine coal feed point, drying machine gas vent, drying machine solid outlet; Drying machine coal feed point and coal bunker export to be connected;
Water Sproading heat exchanger 13, described Water Sproading heat exchanger and drying machine gas vent are connected, for being made the condensate moisture in the weary steam of self-desiccation machine gas vent in the future by cooling medium and reclaiming;
Described powder process subsystem 20 comprises medium-speed pulverizer blowing powder producing equipment, and for future, the coal Raw material processing of self-desiccation machine solid outlet becomes coal dust and coal dust is blown into boiler;
Described Water Sproading subsystem 10 and powder process subsystem 20 are pressed close to be arranged in same building thing 4.Above-mentioned press close to setting refer to and do not need moisture-free coal transloading equipment between Water Sproading subsystem 10 and powder process subsystem 20.
The course of work with the integral type unit pulverized-coal system of coal drying and Water Sproading function of the above embodiment of the present invention is as follows: coal bunker sent into by coal raw material, after drying machine drying, enter medium-speed pulverizer by feeder, grind qualified coal dust through First air carry be blown into boiler participate in burning.In addition, brown coal are after drying machine drying, and weary steam (described weary steam refers to the mixture of the steam that moisture in brown coal is formed by thermal evaporation in drying machine and air, and its temperature is about 120 DEG C, namely preferred at 110-130 DEG C) is discharged from drying machine gas vent.Subsequently, weary steam enters Water Sproading heat exchanger and carries out cooling and dehumidifying, and condensed water is recovered utilization, and the saving achieving water resource utilizes.
Water Sproading subsystem 10 of the present invention and powder process subsystem 20 integrate, without the need to long distance transportation coal dust, more safe and reliable, and cost of investment is corresponding reduction also.Moisture-free coal directly enters coal pulverizer by feeder, and without middle coal bunker, effectively eliminate danger hidden danger.
The structure of medium-speed pulverizer itself determines the entrance desiccant temperature that it uses lower than 400 DEG C, and can only require volatile matter V according to " thermal power plant pulverized coal preparation system designing and calculating technical stipulation "
dafcoal temperature < 70 DEG C after medium-speed pulverizer blowing powder producing separator of>=40%, therefore medium-speed pulverizer drying capacity is restricted.Coal dust of the present invention obtains abundant drying in Water Sproading subsystem, greatly alleviates medium-speed pulverizer drying pressure, and take powder medium without the need to using the heat primary air of higher temperature, security performance is highly improved; System can use traditional bituminous coal medium-speed pulverizer and bituminous coal fired boiler, the former boiler using brown coal of a large amount of saving and pulverized coal preparation system investment.
This system core equipment is steam pipe type drier, adopt the low-pressure steam indirect drying brown coals such as residual heat of electric power plant steam, auxiliary steam, heat source stream maximum pressure is 0.5MPa(g) saturated vapor, heat source temperature lower (<160 DEG C), brown coal dehydration rate reaches as high as more than 90% and pyrolytic reaction can not occur.In addition, dry run is little on the impact of ature of coal volatile matter, even if to make First air enter fire box temperature lower for therefore higher volatile matter, also there will not be the phenomenon of catch fire postponement and unstable combustion.Drying medium in drying machine is low-pressure steam (<150 DEG C), and drying mode is contact drying, and drying medium does not directly contact with material, and brown coal material pyrolysis does not occur.
The coal integral type unit pulverized-coal system that is dry and Water Sproading function that has of the above embodiment of the present invention can also be improved further, and described Water Sproading subsystem 10 also comprises deduster 15, dedusting air-introduced machine 16 and chimney 17; Described deduster is arranged between described drying machine gas vent and Water Sproading heat exchanger; Described dedusting air-introduced machine is arranged on the gas outlet of described Water Sproading heat exchanger; Described chimney is communicated with dedusting air-introduced machine.
When above-described embodiment has the integral type unit pulverized-coal system use of coal drying and Water Sproading function, by accurately controlling drying machine intake air amount (this air is for carrying the moisture in coal raw material), ensure the oxygen content that the weary steam of whole dry run is lower, avoid dry coal dust, in drying machine or in weary Steam Dust device, spontaneous combustion occurs.
The coal integral type unit pulverized-coal system that is dry and Water Sproading function that has of the above embodiment of the present invention can also be improved further, described Water Sproading heat exchanger 13 comprises one-level Water Sproading heat exchanger 131 and secondary Water Sproading heat exchanger 132, and described one-level Water Sproading heat exchanger and secondary Water Sproading heat exchanger are connected in series.Pass into the cooling medium of the first temperature in described one-level Water Sproading heat exchanger, in secondary Water Sproading heat exchanger, pass into the cooling medium of the second temperature.
Two-stage Water Sproading heat-exchanger rig can use the cooling medium of different temperatures grade, the reasonable cascade utilization energy, by water vapour cooling condensation in dry exhaust steam, reclaims brown coal drying water.
The coal integral type unit pulverized-coal system that is dry and Water Sproading function that has of the above embodiment of the present invention can also be improved further, and described coal raw material is the precrushing brown coal of particle diameter <20mm.
Having in the integral type unit pulverized-coal system of coal drying and Water Sproading function of the above embodiment of the present invention, described powder process subsystem 20 comprises:
Mill separator 21, described mill separator comprises mill separator charging aperture and mill separator discharge;
Medium-speed pulverizer 22, described medium-speed pulverizer comprises medium-speed pulverizer charging aperture, medium-speed pulverizer First air air inlet, medium-speed pulverizer sealing air air inlet; Mill separator discharge and medium-speed pulverizer charging aperture are interconnected;
Feeder 23, moulded coal is sent to mill separator charging aperture by described feeder;
Boiler 24, to mix with coal dust at described pot furnace air and carries out Thorough combustion;
Air preheater 25, described air preheater is arranged on described boiler;
Burner 26, described burner comprises burner inlet and burner outlet; Burner outlet is communicated with the entrance of boiler;
Pulverized coal distributor 27 and isolation door 28, described mill separator discharge, pulverized coal distributor, isolation door are communicated with successively with burner inlet;
Pressure fan 29, it is combustion-supporting that the Secondary Air that described pressure fan exports enters burner inlet after air preheater heating;
Primary air fan 31, the wind that described primary air fan exports enters medium-speed pulverizer air inlet after air preheater heating.
The coal integral type unit pulverized-coal system that is dry and Water Sproading function that has of the above embodiment of the present invention can also be improved further, and described powder process subsystem also comprises secondary air box 33, and described secondary air box is connected with burner inlet, poor for regulating stove gun pressure.
The coal integral type unit pulverized-coal system that is dry and Water Sproading function that has of the above embodiment of the present invention can also be improved further, described powder process subsystem also comprises deduster 34 and air-introduced machine 35, the entrance of deduster is communicated with the exhanst gas outlet of boiler, and outlet is communicated with described air-introduced machine.
The coal integral type unit pulverized-coal system that is dry and Water Sproading function that has of the above embodiment of the present invention can also be improved further, and described powder process subsystem also comprises seal fan 36, and described seal fan is communicated with medium-speed pulverizer, for anti-leak-stopping powder.In a more preferred embodiment, described powder process subsystem also comprises apparatus for measuring air quantity 37, and described apparatus for measuring air quantity is arranged on medium-speed pulverizer air inlet, for measuring air quantity.
The course of work with the integral type unit pulverized-coal system of coal drying and Water Sproading function of the preferred embodiment of the present invention is as follows: the precrushing brown coal of particle diameter <20mm send into coal bunker, after drying machine drying, enter mill separator and medium-speed pulverizer, coal dust is blown into boiler and participates in combustion reaction.In addition, brown coal are after drying machine is dried, weary steam (described weary steam refers to the mixture of the steam that moisture in brown coal is formed by thermal evaporation in drying machine and air, and its temperature is about 120 DEG C, namely preferred at 110-130 DEG C) is discharged from drying machine gas vent.This pipeline sets up negative pressure by the dedusting air-introduced machine after Water Sproading heat exchanger, and weary steam is with a large amount of coal dust, and after deduster, most of coal dust, by filtering, falls into bottom deduster, sends into medium-speed pulverizer in the lump.Weary steam after filtration enters Water Sproading heat exchanger (successively by one-level Water Sproading heat exchanger and secondary Water Sproading heat exchanger) and carries out cooling and dehumidifying, and condensed water is recovered utilization, and the saving achieving water resource utilizes.The gradable refrigerant utilizing different temperatures in system of twin-stage Water Sproading heat-exchanger rig, thus realize the classified utilization of energy, Water Sproading rate can reach more than 50%.Fixed gas in weary steam is extracted out by dedusting air-introduced machine, drains into air after treatment eventually through chimney.
Each technical characteristic of above-mentioned disclosure is not limited to that disclosed with combination that is further feature, other combination that those skilled in the art also can carry out between each technical characteristic according to the object of invention, is as the criterion with the object realizing the present invention.
Claims (10)
1. there is an integral type unit pulverized-coal system for coal drying and Water Sproading function, be made up of Water Sproading subsystem and powder process subsystem; It is characterized in that:
Described Water Sproading subsystem comprises:
Coal bunker, described coal bunker comprises coal bunker outlet, and coal bunker is for loading coal raw material;
Drying machine, described drying machine comprises drying machine coal feed point, drying machine gas vent, drying machine solid outlet; Drying machine coal feed point and coal bunker export to be connected;
Water Sproading heat exchanger, described Water Sproading heat exchanger and drying machine gas vent are connected, for being made the condensate moisture in the weary steam of self-desiccation machine gas vent in the future by cooling medium and reclaiming;
Described powder process subsystem comprises medium-speed pulverizer blowing powder producing equipment, and for future, the coal Raw material processing of self-desiccation machine solid outlet becomes coal dust and coal dust is blown into boiler; Described Water Sproading subsystem and powder process subsystem are pressed close to arrange.
2. the integral type unit pulverized-coal system with coal drying and Water Sproading function according to claim 1, it is characterized in that, described Water Sproading subsystem also comprises deduster, dedusting air-introduced machine and chimney; Described deduster is arranged between described drying machine gas vent and Water Sproading heat exchanger; Described dedusting air-introduced machine is arranged on the gas outlet of described Water Sproading heat exchanger; Described chimney is communicated with dedusting air-introduced machine.
3. the integral type unit pulverized-coal system with coal drying and Water Sproading function according to claim 2, it is characterized in that, described Water Sproading heat exchanger comprises one-level Water Sproading heat exchanger and secondary Water Sproading heat exchanger, and described one-level Water Sproading heat exchanger and secondary Water Sproading heat exchanger are connected in series.
4. the integral type unit pulverized-coal system with coal drying and Water Sproading function according to claim 3, it is characterized in that, pass into the cooling medium of the first temperature in described one-level Water Sproading heat exchanger, in secondary Water Sproading heat exchanger, pass into the cooling medium of the second temperature.
5. the integral type unit pulverized-coal system with coal drying and Water Sproading function according to any one of claim 4, it is characterized in that, described coal raw material is the precrushing brown coal of particle diameter <20mm.
6. the integral type unit pulverized-coal system with coal drying and Water Sproading function according to any one of claim 1-5, it is characterized in that, described powder process subsystem comprises:
Mill separator, described mill separator comprises mill separator charging aperture and mill separator discharge;
Medium-speed pulverizer, described medium-speed pulverizer comprises medium-speed pulverizer charging aperture, medium-speed pulverizer First air air inlet, medium-speed pulverizer sealing air air inlet; Mill separator discharge and medium-speed pulverizer charging aperture are interconnected;
Feeder, moulded coal is sent to mill separator charging aperture by described feeder;
Boiler, to mix with coal dust at described pot furnace air and carries out Thorough combustion;
Air preheater, described air preheater is arranged on described boiler;
Burner, described burner comprises burner inlet and burner outlet; Burner outlet is communicated with the entrance of boiler;
Pulverized coal distributor and isolation door, described mill separator discharge, pulverized coal distributor, isolation door are communicated with successively with burner inlet;
Pressure fan, it is combustion-supporting that the Secondary Air that described pressure fan exports enters burner inlet after air preheater heating;
Primary air fan, the wind that described primary air fan exports enters medium-speed pulverizer air inlet after air preheater heating.
7. the integral type unit pulverized-coal system with coal drying and Water Sproading function according to claim 6, it is characterized in that, also comprise apparatus for measuring air quantity, described apparatus for measuring air quantity is arranged on medium-speed pulverizer air inlet, for measuring air quantity.
8. the integral type unit pulverized-coal system with coal drying and Water Sproading function according to claim 6, it is characterized in that, described powder process subsystem also comprises secondary air box, and described secondary air box is connected with burner inlet, poor for regulating stove gun pressure.
9. the integral type unit pulverized-coal system with coal drying and Water Sproading function according to claim 6, it is characterized in that, described powder process subsystem also comprises deduster and air-introduced machine, and the entrance of deduster is communicated with the exhanst gas outlet of boiler, and outlet is communicated with described air-introduced machine.
10. the integral type unit pulverized-coal system with coal drying and Water Sproading function according to claim 6, it is characterized in that, described powder process subsystem also comprises seal fan, and described seal fan is communicated with medium-speed pulverizer, for anti-leak-stopping powder.
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Cited By (1)
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| CN106196133A (en) * | 2016-07-12 | 2016-12-07 | 山东省环能设计院股份有限公司 | A kind of negative pressure coal dust preparation system |
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| CN204786511U (en) * | 2015-06-12 | 2015-11-18 | 北京国电龙源环保工程有限公司 | Integral type unit pulverized -coal system with coal drying and water recovery function |
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| CN106196133A (en) * | 2016-07-12 | 2016-12-07 | 山东省环能设计院股份有限公司 | A kind of negative pressure coal dust preparation system |
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Application publication date: 20150923 |