CN102889606A - Direct fired pulverizing system of smoke pre-drying lignite steel ball mill - Google Patents
Direct fired pulverizing system of smoke pre-drying lignite steel ball mill Download PDFInfo
- Publication number
- CN102889606A CN102889606A CN2011102027787A CN201110202778A CN102889606A CN 102889606 A CN102889606 A CN 102889606A CN 2011102027787 A CN2011102027787 A CN 2011102027787A CN 201110202778 A CN201110202778 A CN 201110202778A CN 102889606 A CN102889606 A CN 102889606A
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- China
- Prior art keywords
- coal
- mill
- drying
- smoke
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000001035 drying Methods 0.000 title claims abstract description 40
- 239000003077 lignite Substances 0.000 title claims abstract description 39
- 239000000779 smoke Substances 0.000 title claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 11
- 239000010959 steel Substances 0.000 title claims abstract description 11
- 238000010298 pulverizing process Methods 0.000 title abstract description 12
- 239000003245 coal Substances 0.000 claims abstract description 163
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 151
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 70
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical group 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Abstract
The invention discloses a direct fired pulverizing system of a smoke pre-drying lignite steel ball mill. A coal inlet of the steel ball coal mill is connected with a pre-drying device; a coal inlet and a high-temperature smoke dryer inlet are arranged on the upper part of the pre-drying device; an exhaust port is arranged on a side of the bottom and connected with a dust remover; an exhaust outlet of the dust remover is connected with an exhaust fan; a powder outlet of the dust remover is connected with a coal inlet of the steel ball coal mill; and the high-temperature smoke dryer inlet of the pre-drying device is connected with a smoke mixing chamber that has two smoke inlets, wherein the first smoke inlet is connected with a hot smoke pumping port of a boiler furnace, while the second smoke inlet is connected with a cool smoke pumping port of the boiler furnace. The direct fired pulverizing system has a series of advantages such as good drying effect, safety in operation, and capability in improving combustion performance of pulverized coal and lowering coal consumption for power generation. The direct fired pulverizing system can be used for transformation of steel ball mill pulverizing systems of the in-service lignite generator units, or lately built lignite generator units and has great promotion and application prospect.
Description
Technical field
The invention belongs to the coal fired power generation technical field, relate to the brown coal generation technology.Specifically, the pulverized coal preparation system and the combustion system that relate to coal-fired power station boiler.
Background technology
Brown coal are the minimum pit coals of degree of coalification, are peat deposition changes the organic-biological rock into by dehydration, compacting initial stage products, because appearance is brown or crineous is gained the name.Brown coal account for 18% of China's thermal coal reserves, mainly are distributed in the areas such as the Inner Mongol, northeast and Yunnan.Brown coal have the high (V of volatile matter
Daf＞37%), the characteristics such as moisture high (total moisture is about 30%, and free moisture surpasses 19% mostly), caloric value low (approximately 12.56MJ/kg), ash fusion point low (approximately 1150 ℃), abrasiveness low (HGI is 50-70) and easy spontaneous combustion.The characteristics of brown coal " two Senior Three are low " have determined that its pulverized coal preparation system has certain particularity.
Brown coal are mainly used in Power Plant Fuel, also can be used for the fields such as chemical industry.The brown coal generating is widely used in developed countries such as Australia, Germany, the U.S..Research points out, the brown coal behind the burning drying and upgrading can improve boiler efficiency, reduce exhaust gas temperature, reduce the energy consumption of the power plant auxiliary machines such as air-introduced machine, coal pulverizer, reduce gross coal consumption rate, improve plant thermal efficiency, simultaneously to reducing CO
2, NO
XDischarging also plays a role.
At present, domestic power coal market is in short supply, and state's ore deposit electricity coal price lattice are high.For ensureing the long-term stability supply of electric coal, and control Power Plant Fuel cost, a large amount of power plant begin to explore and test to mix in all kinds of coal-fired units to burn cheap brown coal.Because brown coal moisture is higher and inflammable and explosive, therefore pulverized coal preparation system drying capacity deficiency and explosion of Coal Pulverizing System hidden danger become the key factor that burning brown coal is mixed by restriction power plant.
In power station boiler pulverizing system, the difference of the maximum of all kinds of pulverized coal preparation systems is the coal pulverizer type.The coal pulverizer of widely using at present mainly contains low speed coal mill, medium-speed pulverizer and low speed coal mill three major types, wherein adopts the pulverized coal preparation system of low speed coal mill to account for China at 60% of labour power station boiler pulverizing system.Therefore, existing ball mill pulverizing system is improved, make it satisfy the requirement that vast scale is mixed burning brown coal or ground the high-moisture brown coal, all have significant economy and environmental benefit to what adopt the Ball Mill pulverized coal preparation system in labour and newly-built station boiler.
At present using more in China is singly to advance singly to go out low speed coal mill, introduces in the unit in minority and adopt double-inlet and double-outlet steel ball coal mill.For with the difference that goes with each other all the time, it is the plain ball coal pulverizer that normal title singly advances singly to go out low speed coal mill.Generally speaking, the plain ball coal pulverizer is the negative pressure operation, joins bin storage type pulverizing system, adopts hot blast or transporting pulverized coal with exhaust gas; And double inlet and outlet coal mill is operation under positive pressure, joins direct-firing or half unit pulverized-coal system, adopts pulverized coal carried by hot air in half blowing powder producing.
Most of low speed coal mill adopts hot blast as drier.The plain ball coal pulverizer arranges Powder discharging fan and negative pressure operation, so that utilize coal pulverizer inlet place negative pressure extracting high-temperature flue gas to become possibility.So minority uses meager coal and anthracitic plain ball coal pulverizer pulverized coal carried by hot air pulverized coal preparation system adopts hot cigarette and hot blast mixture as drier, thereby under the constant condition of coal pulverizer ventilation, reduce weary makings amount flow, and then reduce tertiary air to impact and the loss of fine powder uncombusted of fire box temperature.
A large amount of brown coal are mixed and are burnt test and already confirmed, adopt 350～450 ℃ hot blast to be difficult to satisfy the dry demand of high-moisture brown coal as drier.Pulverized coal preparation system drying capacity deficiency not only makes the coal powder performance variation, also affects simultaneously coal pulverizer and grinds to exert oneself and cause boiler output lower, loses meaning so that mix to burn.And the further raising of hot blast temperature is subject to the restriction of air preheater and coal pulverizer bearing allowable temperature.In addition, the explosion-proof performance of bin storage type pulverizing system is relatively poor, brown coal are inflammable and explosive in addition, thus adopt hot blast or hot blast to demand technological improvement with stove cigarette mixture urgently as the Ball Mill pulverized coal preparation system of drier so that low speed coal mill can be safely, economy, efficiently grind the high-moisture brown coal.
Summary of the invention
Technical problem to be solved by this invention provides that a kind of drying effect is good, security of operation, can improve coal powder performance, reduce the predrying brown coal Ball Mill of the flue gas unit pulverized-coal system of gross coal consumption rate, the deficiency that exists to overcome prior art.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
The predrying brown coal Ball Mill of a kind of flue gas unit pulverized-coal system, comprise low speed coal mill, be linked in sequence at the mill separator at low speed coal mill rear portion, pulverized coal distributor and hot air apparatus, described pulverized coal distributor is connected to the burner of boiler, described hot air apparatus divides two-way, one the road is connected to the burner of boiler, another road is connected to the coal feed point of low speed coal mill, it is characterized in that: the coal feed point of described low speed coal mill also is connected with pre-drying device, described pre-drying device top has coal feed point and high temperature flue gas drying agent entrance, bottom sides also has exhaust outlet, described exhaust outlet is connected with deduster, the weary gas outlet of described deduster is connected with weary gas blower fan, and the meal outlet of described deduster is connected to the coal feed point of low speed coal mill; The high temperature flue gas drying agent entrance of described pre-drying device is connected with flue gas mixing-chamber, and described flue gas mixing-chamber has two gas approach, and the first gas approach is connected to the hot cigarette of boiler furnace and takes out mouth, and the second gas approach is connected to the cold smoke of boiler flue and takes out mouth.
Adopt technique scheme, before the coal feed point of low speed coal mill, pre-drying device is set, and the mixed flue gas that the high temperature flue gas drying agent entrance by pre-drying device passes into high-temperature flue gas and cold smoke in the pre-drying device carries out predrying to brown coal, thereby so that most of brown coal free moisture is removed in predrying process, and flue gas oxygen content is low, can guarantee when strengthening the predrying process of brown coal, detonation can not occur, thereby guarantee the pulverized coal preparation system safe operation.Through raw coal is predrying safely and efficiently, the required drier initial temperature of low speed coal mill entrance obviously reduces, and adopts hot blast and cold smoke mixture as the ventilation and the drying medium that enter low speed coal mill.Temperature levels reduces in the coal pulverizer thus, adopts direct-firing mode that coal dust is sent into boiler in addition, can effectively avoid the detonation of brown coal coal dust, and the pulverized coal preparation system security is significantly improved.In addition, the former moisture content of coal that predrying process removes does not enter boiler furnace, can significantly improve coal powder performance, improves simultaneously boiler efficiency, reduces air-introduced machine, coal pulverizer power consumption, thereby reduces gross coal consumption rate.
In further improvement of the present invention, be connected with weary Gas Cooler behind the described weary gas blower fan, weary Gas Cooler has the cold weary gas outlet of dehydration and condensation-water drain.Can be with the separating of steam and weary gas by this weary Gas Cooler, reclaiming moisture and heat in the weary gas, thereby realize the purpose of saving water resource and energy-saving and emission-reduction.Certainly described weary gas blower fan can also directly connect desulfurizing tower, avoids weary gas emission pollution environment.
In an embodiment of the present invention, the second gas approach of described flue gas mixing-chamber is also connected to the cold weary gas outlet of weary Gas Cooler.Like this, native system can also utilize cold weary gas to regulate the initial temperature of high-temperature flue gas drier, has not only avoided weary gas emission pollution environment, has also further brought into play in addition the purposes of cold weary gas.
In addition, also be provided with cigarette wind mixing chamber between the coal feed point of described low speed coal mill and the hot air apparatus, described cold smoke is smoked mouth and also is connected to this wind mixing chamber.Such wind wind-warm syndrome can be regulated by change hot blast, cold smoke ratio.
In embodiments of the invention 1, described low speed coal mill is for singly advancing singly to go out low speed coal mill, and in embodiment 2, described low speed coal mill is double-inlet and double-outlet steel ball coal mill.
Description of drawings
Fig. 1 is the system construction drawing of embodiment 1.
Fig. 2 is the system construction drawing of embodiment 2.
The specific embodiment
Embodiment 1
As shown in Figure 1, the predrying brown coal Ball Mill of the flue gas of the present embodiment unit pulverized-coal system comprises former coal bunker 1, weighing coal feeder 2, pre-drying device 3, singly advance and singly go out low speed coal mill 4, mill separator 5, powder retrieving pipe 6, pulverized coal distributor 7, pressure fan 10, air preheater 11, air supply duct 12, secondary air box 13, flue gas mixing-chamber 15, high-temperature furnace smoke pipeline 16, primary air fan 17, cigarette wind mixing chamber 18, a wind pipeline 19, deduster 24, weary gas blower fan 25, weary Gas Cooler 26, cold weary gas blower fan 27, blast pipe road 29, cold smoke blower fan 21, cold smoke pipeline 22 and cold smoke branch pipe(tube) 23.
Wherein, former coal bunker 1 connects weighing coal feeder 2.Pre-drying device 3 is descending drying tube, and its top has coal feed point and high temperature flue gas drying agent entrance, and the bottom has coal outlet, has exhaust outlet in bottom sides.Weighing coal feeder 2 is connected to the coal feed point of pre-drying device 3, the coal outlet of pre-drying device 3 is connected to the coal feed point that singly advances singly to go out low speed coal mill 4, the coal outlet of low speed coal mill 4 is connected to mill separator 5, the meal outlet of mill separator 5 is connected to the coal feed point that singly advances singly to go out low speed coal mill 4 by powder retrieving pipe 6, and the fine powder outlet of mill separator 5 is connected to the burner 8 of boiler 9 through pulverized coal distributor 7.
The exhaust outlet of pre-drying device 3 is connected to deduster 21, the meal outlet of deduster 21 is communicated to and singly advances the coal feed point that singly goes out low speed coal mill 4, the weary gas outlet of deduster 21 is connected to weary Gas Cooler 26 through weary gas blower fan 25, weary Gas Cooler 26 is a kind of heat exchanger, has the cold weary gas outlet of condensation-water drain and dehydration, wherein, condensation-water drain is connected to desulfurizing tower wastewater disposal basin 28 (can certainly be recycled by power plant) after water treatment, and cold weary gas outlet connects cold weary gas blower fan 27.
The high temperature flue gas drying agent entrance of pre-drying device 3 is connected to flue gas mixing-chamber 15, and this flue gas mixing-chamber 15 has two gas approach, and wherein the first gas approach hot cigarette of being connected to boiler 9 burner hearths takes out mouthfuls 14.
Pressure fan 10, primary air fan 17 and air preheater 11 consist of hot air apparatus.Air preheater 11 is arranged in the flue of boiler 9, pressure fan 10, primary air fan 17 is arranged on outside the flue of boiler 9, be connected to air preheater 11,11 minutes two-way of air preheater, one the tunnel is connected to the burner of boiler 9 through secondary air box 13, another road is connected to cigarette wind mixing chamber 18, the cold smoke of boiler 9 flue afterbodys is taken out mouth 28 through cold smoke blower fan 29, cold smoke pipeline 30 also is connected to cigarette wind mixing chamber 18, cigarette wind mixing chamber 18 is connected to the coal feed point that singly advances singly to go out low speed coal mill 4 through a wind pipeline 19 again, and cold smoke blower fan 21 also is connected to the second gas approach of flue gas mixing-chamber 15 through Zhi Lengyan pipeline 23.
27 minutes two-way of cold weary gas blower fan, the one road is connected to the second gas approach of flue gas mixing-chamber 15, and another road is connected to desulfurizing tower 30.
In addition, weary gas blower fan 35 also can be directly connected to desulfurizing tower 30.
Embodiment 2
As shown in Figure 2, the present embodiment and embodiment 1 different place is: low speed coal mill is double-inlet and double-outlet steel ball coal mill 41, and two coal feed point all is connected with 3, two coal outlets of pre-drying device and all is connected with mill separator 5.Other structure is identical with embodiment 1.
More than be exactly the predrying brown coal Ball Mill of flue gas of the present invention unit pulverized-coal system, its working method is as follows:
The brown coal raw coal is sent into pre-drying device 3 from former coal bunker 1 through weighing coal feeder 2, mix and the descending predrying process of raw coal of finishing with drier from flue gas mixing-chamber 15 at pre-drying device 3 tops, weary gas after predrying reclaims fine powders from the bottom side of pre-drying device 3 to escaping and enter deduster 24 by weary gas blower fan 25, the fine powder that deduster 24 reclaims returns and enters low speed coal mill and (singly advance and singly go out low speed coal mill 4, double-inlet and double-outlet steel ball coal mill 4) in, weary gas enters weary Gas Cooler 26 and further is cooled to below the water dew point temperature to reclaim the moisture (perhaps weary gas blower fan 25 is directly with the past desulfurizing tower 30 of moisture weary pneumatic transmission) in the weary gas, the heat energy that weary Gas Cooler 26 reclaims returns power plant's boiler circuit by cooling water, the cold weary gas of low temperature dewatering that weary Gas Cooler 26 is discharged is carried by cold weary gas blower fan 27, the cold weary gas of a part returns flue gas mixing-chamber 15 as temperature control medium, remaining part is discharged into desulfurizing tower 30, the condensate water that weary Gas Cooler 26 is discharged both can be recycled after treatment, also can directly be discharged into desulfurizing tower wastewater disposal basin 28 and focus on.
The hot cigarette that enters flue gas mixing-chamber 15 is taken out mouthful 14 extractions by the negative pressure in the pre-drying device 3 from the hot cigarette of burner hearth, the cold weary air lift that cold smoke is carried by cold weary gas blower fan 27 and blast pipe road 29 when arranging weary Gas Cooler 26 and work supplies, perhaps by cold weary gas with take out from cold smoke mouthfuls 20 and the cold smoke of cold smoke branch pipe(tube) 23 mixes in the lump as temperature control medium, do not arrange that cold smoke was not taken out mouthful 20 extractions by cold smoke blower fan 21 from the cold smoke of boiler back end ductwork when weary Gas Cooler 26 or weary Gas Cooler 26 were not worked.Hot cigarette, cold smoke (or cold weary gas) mix at flue gas mixing-chamber 15, and the drier as the predrying process of raw coal enters pre-drying device 3 then.The flue-gas temperature of flue gas mixing-chamber 15 outlets is regulated by changing hot and cold cigarette ratio.
Entering low speed coal mill through pre-drying device 3 dried raw coal grinds, wind powder mixture after grinding enters mill separator 5, isolated meal is sent low speed coal mill 4 back to by powder retrieving pipe 6 and is continued to grind, and qualified coal dust and weary gas are sent to burner 8 in the stove internal combustion after pulverized coal distributor 7 distributes.
Hot blast from primary air fan 17 and air preheater 11 outlets mixes at wind mixing chamber 18 with the cold smoke of smoking mouth 20 from cold smoke, enter low speed coal mill as the low speed coal mill ventilation with drying medium and raw coal, low speed coal mill entrance wind-warm syndrome is regulated by change hot blast, cold smoke ratio.Hot blast from pressure fan 10 and air preheater 11 outlets is sent to each burner 8 participation stove internal combustion as Secondary Air after secondary air box 13 is distributed.
The predrying brown coal Ball Mill of flue gas of the present invention unit pulverized-coal system is compared with existing Ball Mill pulverized coal preparation system, has following characteristics:
(1), adopt high-temperature flue gas as the drier in the pre-drying device, desiccant dryness capacity adjustment scope is large, can satisfy the dry demand of all kinds of high-moisture raw coals.Most of raw coal free moisture is removed in pre-drying device simultaneously, and the coal pulverizer inlet wind-warm syndrome can correspondingly reduce thus.
(2), the drier of pre-drying device is the inert media flue gas, the mill drying agent is the lower hot blast of temperature and cold smoke mixture, pulverized coal preparation system can effectively prevent the coal dust detonation thus, security is good.
(3), raw coal do not enter boiler furnace at the moisture that the pre-drying device inner drying goes out, and can significantly improve coal powder performance, improves simultaneously boiler efficiency, reduces air-introduced machine, coal pulverizer power consumption, thereby reduce gross coal consumption rate.
(4), weary Gas Cooler be set reclaim moisture and heat energy in the weary gas, both can further improve unit efficiency and reduced gross coal consumption rate, also recyclable great lot of water resources.
(5), weary gas is not directly emptying, a part is recycling in pulverized coal preparation system as temperature control medium, remaining part is discharged into desulfurizing tower, therefore environmentally safe.
(6), adopt pressurized direct pulverizing coal system, singly went out low speed coal mill therefore the low speed coal mill in this patent both can adopt singly to advance, also can adopt double-inlet and double-outlet steel ball coal mill.
(7), native system both can be applicable to labour unit brown coal mix burning, also can be applicable to the station boiler of whole burning high-moisture brown coal.
But, those of ordinary skill in the art will be appreciated that, above embodiment illustrates the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (5)
1. the predrying brown coal Ball Mill of flue gas unit pulverized-coal system, comprise low speed coal mill, be linked in sequence at the mill separator at low speed coal mill rear portion, pulverized coal distributor and hot air apparatus, described pulverized coal distributor is connected to the burner of boiler, described hot air apparatus divides two-way, one the road is connected to the burner of boiler, another road is connected to the coal feed point of low speed coal mill, it is characterized in that: the coal feed point of described low speed coal mill also is connected with pre-drying device, described pre-drying device top has coal feed point and high temperature flue gas drying agent entrance, bottom sides also has exhaust outlet, described exhaust outlet is connected with deduster, the weary gas outlet of described deduster is connected with weary gas blower fan, and the meal outlet of described deduster is connected to the coal feed point of low speed coal mill; The high temperature flue gas drying agent entrance of described pre-drying device is connected with flue gas mixing-chamber, and described flue gas mixing-chamber has two gas approach, and the first gas approach is connected to the hot cigarette of boiler furnace and takes out mouth, and the second gas approach is connected to the cold smoke of boiler flue and takes out mouth.
2. the predrying brown coal Ball Mill of flue gas according to claim 1 unit pulverized-coal system is characterized in that: be connected with weary Gas Cooler behind the described weary gas blower fan, weary Gas Cooler has cold weary gas outlet and condensation-water drain.
3. the predrying brown coal Ball Mill of flue gas according to claim 1 unit pulverized-coal system is characterized in that: the second gas approach of described flue gas mixing-chamber is also connected to the cold weary gas outlet of weary Gas Cooler.
4. according to claim 1 or the predrying brown coal Ball Mill of 3 described flue gases unit pulverized-coal system, it is characterized in that: also be provided with cigarette wind mixing chamber between the coal feed point of described low speed coal mill and the hot air apparatus, described cold smoke is smoked mouth and also is connected to this wind mixing chamber.
5. the predrying brown coal Ball Mill of flue gas according to claim 1 unit pulverized-coal system, it is characterized in that: described low speed coal mill is for singly advancing singly to go out low speed coal mill or double-inlet and double-outlet steel ball coal mill.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102027787A CN102889606A (en) | 2011-07-20 | 2011-07-20 | Direct fired pulverizing system of smoke pre-drying lignite steel ball mill |
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| CN2011102027787A CN102889606A (en) | 2011-07-20 | 2011-07-20 | Direct fired pulverizing system of smoke pre-drying lignite steel ball mill |
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| CN102889606A true CN102889606A (en) | 2013-01-23 |
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| CN2011102027787A Pending CN102889606A (en) | 2011-07-20 | 2011-07-20 | Direct fired pulverizing system of smoke pre-drying lignite steel ball mill |
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| CN (1) | CN102889606A (en) |
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| CN103234215A (en) * | 2013-05-16 | 2013-08-07 | 昆明理工大学 | Blended pulverized coal combustion control device and method |
| CN103486604A (en) * | 2013-09-02 | 2014-01-01 | 中冶南方工程技术有限公司 | Method and system thereof for generating drying medium |
| CN104165373A (en) * | 2014-08-19 | 2014-11-26 | 上海理工大学 | Exhaust warm air type boiler unit for open coal pulverization |
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| CN104251487A (en) * | 2014-09-24 | 2014-12-31 | 西安西热锅炉环保工程有限公司 | Method for improving boiler combustion economy of tangential combustion anthracite coal boiler |
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| CN103148495A (en) * | 2013-03-18 | 2013-06-12 | 施大钟 | High-sodium coal sodium removal, quality improvement fan mill pulverization and water recovery combined cycle power generation system |
| CN103234215A (en) * | 2013-05-16 | 2013-08-07 | 昆明理工大学 | Blended pulverized coal combustion control device and method |
| CN103234215B (en) * | 2013-05-16 | 2015-06-03 | 昆明理工大学 | Blended pulverized coal combustion control device and method |
| CN104344398B (en) * | 2013-07-31 | 2016-08-10 | 烟台龙源电力技术股份有限公司 | Middle warehouse formula pulverized coal carried by hot air pulverized coal preparation system |
| CN104344398A (en) * | 2013-07-31 | 2015-02-11 | 烟台龙源电力技术股份有限公司 | Middle storage type hot wind powder feeding and pulverizing system |
| CN103486604A (en) * | 2013-09-02 | 2014-01-01 | 中冶南方工程技术有限公司 | Method and system thereof for generating drying medium |
| CN103486604B (en) * | 2013-09-02 | 2015-11-18 | 中冶南方工程技术有限公司 | A kind of generation method of drying medium and system thereof |
| CN104165373A (en) * | 2014-08-19 | 2014-11-26 | 上海理工大学 | Exhaust warm air type boiler unit for open coal pulverization |
| CN104165373B (en) * | 2014-08-19 | 2016-06-08 | 上海理工大学 | The open weary gas heating type boiler controller system of powder process |
| CN104180607A (en) * | 2014-08-20 | 2014-12-03 | 西安交通大学 | Brown coal upgrading system employing multi-stage drying |
| CN104251487A (en) * | 2014-09-24 | 2014-12-31 | 西安西热锅炉环保工程有限公司 | Method for improving boiler combustion economy of tangential combustion anthracite coal boiler |
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