CN202195493U - Medium-speed milling pulverization system for flue gas-dried lignite - Google Patents
Medium-speed milling pulverization system for flue gas-dried lignite Download PDFInfo
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- CN202195493U CN202195493U CN2011202091581U CN201120209158U CN202195493U CN 202195493 U CN202195493 U CN 202195493U CN 2011202091581 U CN2011202091581 U CN 2011202091581U CN 201120209158 U CN201120209158 U CN 201120209158U CN 202195493 U CN202195493 U CN 202195493U
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Abstract
The utility model discloses a medium-speed milling pulverization system for flue gas-dried lignite, wherein a drying device is connected to a coal inlet formed at the top of a medium-speed coal mill; a coal inlet and a high-temperature flue gas drier inlet are formed at the top of the drying device, while a coal outlet is formed on the bottom thereof; exhaust ports are formed on the side faces of the bottom of the drying device, and connected to the air inlet of the medium-speed coal mill through a powder exhaust fan; a coarse powder separator is connected to a fine powder separator; the coal outlet of the fine powder separator is connected to a powder feeder which is connected to an air-powder mixer; one branch of hot air of an air preheater is also connected to the air-powder mixer through a primary air bellow; an exhaust gas outlet of the fine powder separator is connected to a dust remover; and the powder outlet of the dust remover is further connected to the powder feeder, while the gas outlet thereof is connected to an exhaust gas fan. The medium-speed milling pulverization system for flue gas-dried lignite is capable of realizing large-proportion admixing combustion or full combustion of lignite in a coal burning unit employing a direct-blow medium-speed milling pulverization system and further capable of improving the efficiency of the unit and reducing the power generation coal consumption, and simultaneously has the advantages of not causing deflagration, operating safely and recycling moisture in the lignite.
Description
Technical field
The utility model belongs to the coal fired power generation technical field, relates 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 depositions after dehydration, compacting change the initial stage product of organic-biological rock into, because of appearance is brown or crineous is gained the name.Brown coal account for 18% of China's thermal coal reserves, mainly are distributed in areas such as the Inner Mongol, three provinces in the northeast of China and Yunnan.Brown coal have volatile matter height (V
Daf＞37%) characteristics such as moisture high (total moisture is about 30%, and free moisture surpasses 19% mostly), caloric value low (about 12.56MJ/kg), ash fusion point low (about 1150 ℃), low (HGI is 50-70) of abrasiveness 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 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 that the brown coal behind the burning drying and upgrading can improve unit efficiency, reduce the power consumption of subsidiary engines such as air-introduced machine, coal pulverizer, thereby reduces gross coal consumption rate, simultaneously to reducing CO
2, NO
xDischarging is also played a role.
At present, domestic electric coal strained market supply, 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 in all kinds of coal-fired units, to mix to burn cheap brown coal.Higher and inflammable and explosive because of brown coal moisture, so becoming, dry undercapacity of pulverized coal preparation system and explosion of Coal Pulverizing System hidden danger restricts the key factor that burning brown coal is mixed by power plant.
In the station boiler pulverized coal preparation 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 blower mill three major types.Advantages such as wherein medium-speed pulverizer is low because of the powder process power consumption, maintenance workload is little, the varying duty performance is good are widely used in burning smoke coal and the meager coal unit, and part is fired low moisture brown coal unit and also adopted medium-speed pulverizer powder process.
Medium-speed pulverizer one well matched unit pulverized-coal system.The state of its internal desiccant when working according to medium-speed pulverizer, be divided into malleation direct-firing with direct-firing two types of negative pressure.In the direct-firing system of negative pressure; Dispose Powder discharging fan behind the coal pulverizer; Coal pulverizer is worked under negative pressure state, helps avoiding coal pulverizer to leak powder to environment, but all are gone into the stove coal dust and all pass through Powder discharging fan; The Powder discharging fan functional reliability is relatively poor, so the direct-firing medium-speed pulverizer pulverized coal preparation system of present negative pressure is relatively more rare.In the pressurized direct pulverizing coal system of extensive use at present, generally adopt high pressure sealing wind to avoid coal pulverizer to leak powder to environment.Different according to the position of primary air fan, malleation is direct-firing can be divided into heat primary air machine system and cold primary air fan system again.
As shown in Figure 1; The direct-firing heat primary air mechanism of existing medium-speed pulverizer malleation powder system; During this system works, raw coal is sent into medium-speed pulverizer 3 from run coal bin 1 through weighing coal feeder 2 and is ground, and the wind powder mixture after grinding gets into mill separator 4; Isolated meal returns coal pulverizer 3 again to be continued to grind, and qualified coal dust and a wind are sent to each burner 6 and spray into boiler 7 internal combustion after pulverized coal distributor 5 distributes.The air preheater 8 heating backs that air is sent in the boiler flue by pressure fan 9 are divided into two-way through hot air duct 10; One the tunnel gets into medium-speed pulverizer 3 as drier and a wind after 11 superchargings of heat primary air machine, another road is sent to each burner 6 as secondary wind through secondary air box 12 distribution and is participated in burning.Seal fan 13 provides high pressure cold wind to be used for Seal of Equipment such as coal pulverizer, feeder.Coal pulverizer drier initial temperature is regulated through heat primary air machine 11 preceding cold-air flaps 41.
Above-mentioned medium-speed pulverizer pulverized coal preparation system is to adopt hot blast as drying medium, and hot blast temperature is 350～450 ℃ of scopes.A large amount of brown coal are mixed and are burnt test and confirmed already, adopts 350～450 ℃ hot blast to be difficult to satisfy the dry demand of high-moisture brown coal as drier, and the further raising of hot blast temperature receive the restriction of air preheater 8 and medium-speed pulverizer 3 safe operations.Therefore, dry undercapacity is the key factor that restriction medium-speed pulverizer pulverized coal preparation system is mixed burning brown coal.The dry undercapacity of pulverized coal preparation system not only makes the coal powder performance variation, also influences coal pulverizer simultaneously and grinds to exert oneself and cause boiler output lower, makes to mix to burn to lose meaning.
In addition because brown coal are inflammable and explosive, with the high-temperature hot-air that is rich in oxygen as coal pulverizer drier and defeated powder medium, the medium-speed pulverizer operation is very dangerous.
The utility model content
The utility model technical problem to be solved provides a kind of flue gas drying brown coal medium-speed pulverizer pulverized coal preparation system; This pulverized coal preparation system solves medium-speed pulverizer when grinding the high-moisture brown coal; Because of dry undercapacity makes milling efficiency low; Cause boiler output not enough, problems such as coal powder performance variation; And with inert media as medium-speed pulverizer internal desiccant and defeated powder medium, the pulverized coal preparation system security is significantly strengthened; Also reduce simultaneously gross coal consumption rate, and reclaim great lot of water resources.
In order to solve the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of flue gas drying brown coal medium-speed pulverizer pulverized coal preparation system, it includes medium-speed pulverizer, pressure fan, seal fan and is located at the air preheater in the boiler flue, and said pressure fan connects air preheater; The hot blast of air preheater outlet divides two-way; One the tunnel connects burner, and said seal fan connects the sealing air port of medium-speed pulverizer, and it is characterized in that: said medium-speed pulverizer is connected with drying device at the coal feed point at top; Said drying device top has coal feed point and high temperature flue gas drying agent inlet; The bottom has coal outlet, and bottom sides has exhaust outlet, and said exhaust outlet connects the air inlet of medium-speed pulverizer through Powder discharging fan; Said mill separator is connected with pulverized-coal collector; The meal outlet of pulverized-coal collector connects machine supplying powder; Machine supplying powder connects air and powder mixer, and another road hot blast of said air preheater also connects air and powder mixer through bellows, and the weary gas outlet of pulverized-coal collector connects deduster; The meal outlet of deduster connects machine supplying powder again, and the gas outlet of deduster is connected with weary gas blower fan.
Through being set before medium-speed pulverizer, a drying device utilize high-temperature flue gas to carry out predrying to brown coal; Make the moisture in the brown coal reduce, can in the coal-fired unit that adopts the medium-speed pulverizer pulverized coal preparation system, mix burning brown coal or clean burn brown coal by vast scale thus to adapt to the requirement of medium-speed pulverizer to former moisture content of coal.And then utilize Powder discharging fan that the air inlet of medium-speed pulverizer is sent in the exhaust of drying device, replace hot blast as required drier and the defeated powder medium of medium-speed pulverizer operation.Flue gas drying agent oxygen content is low, and medium-speed pulverizer is safer when grinding brown coal thus, has eliminated the hidden danger of brown coal detonations, the security that has improved pulverized coal preparation system.Utilize pulverized-coal collector and sack cleaner that weary gas is separated with coal dust, weary G&W branch does not get into boiler furnace, has improved coal powder performance, has improved boiler efficiency, can reduce the power consumption of blower fan, medium-speed pulverizer simultaneously, thereby reduce gross coal consumption rate.
Said weary gas blower fan is connected with weary gas cooler, and this weary air cooling but utensil has condensation-water drain and cold weary gas outlet.Through weary gas cooler is set, the condensed water that freeze-outs can also be recycled, and helps the conserve water resource.
Perhaps should directly connect desulfurizing tower by weary gas blower fan.Weary like this gas blower fan directly is discharged into desulfurizing tower with moisture weary gas, avoids weary gas emptying contaminated environment.
For realizing that the temperature that gets into the high-temperature flue gas in the drying device is regulated, the high temperature flue gas drying agent inlet of said drying device is connected with flue gas mixing-chamber, regulates flue-gas temperature through changing hot and cold cigarette ratio.Hot cigarette is from boiler furnace, and the cold weary gas of cold smoke weary gas cooler outlet both capable of using also can be through being provided with the cold smoke blower fan and the cold smoke pipeline extracts from boiler back end ductwork.
For convenient the desiccant temperature and the flow that get into Powder discharging fan and medium-speed pulverizer are regulated, on the blast pipe road, had a blast pipe road that is connected to Powder discharging fan between said flue gas mixing-chamber and the blast pipe road, this blast pipe road is provided with valve.
In addition, give another embodiment at the utility model, in this embodiment, be connected with Pulverized Coal Bin before the said machine supplying powder, the meal outlet of said pulverized-coal collector and the meal outlet of deduster all are connected to this Pulverized Coal Bin.In machine supplying powder the place ahead Pulverized Coal Bin is set, can makes pulverized coal preparation system not receive the influence of boiler load, guarantee that pulverized coal preparation system can be stablized, efficiently operation.
Description of drawings
Through the description of its exemplary embodiment being carried out below in conjunction with accompanying drawing, the above-mentioned feature and advantage of the utility model will become apparent and understand easily.
Fig. 1 is the structural representation of the direct-firing heat primary air mechanism of the medium-speed pulverizer malleation of prior art powder system;
Fig. 2 is the system architecture sketch map of embodiment 1.
Fig. 3 is the system architecture sketch map of embodiment 2.
The specific embodiment
As shown in Figure 2, flue gas drying brown coal medium-speed pulverizer half unit pulverized-coal system of the utility model comprises run coal bin 1, feeder 2; Medium-speed pulverizer 3, air preheater 8,9, bellows 11 of pressure fan; Secondary air box 12, seal fan 13, drying device 14, flue gas mixing-chamber 15; Sack cleaner 16, weary gas blower fan 17, weary gas cooler 18, Powder discharging fan 31, pulverized-coal collector 32, machine supplying powder 33, air and powder mixer 34.The top of medium-speed pulverizer 3 has mill separator 4.
Wherein, drying device 14 is descending drying tube, and the top has coal feed point and high temperature flue gas drying agent inlet, and the bottom has coal outlet, has exhaust outlet in bottom sides.The coal outlet of run coal bin 1 bottom connects feeder 2, and feeder 2 connects the coal feed point at drying device 14 tops again.Flue gas mixing-chamber 15 is connected the high temperature flue gas drying agent inlet on drying device 14 tops.The coal outlet of drying device 14 connects the coal feed point of medium-speed pulverizer 3; The mill separator 4 of medium-speed pulverizer 3 connects pulverized-coal collector 32; The gas outlet of pulverized-coal collector 32 connects sack cleaner 16; The meal outlet of the meal outlet of sack cleaner 16 and pulverized-coal collector 32 all is connected to machine supplying powder 33, and machine supplying powder 33 is connected to air and powder mixer 34, and air and powder mixer 34 is connected to the burner 6 of boiler 7.The gas outlet of sack cleaner 16 connects weary gas cooler 18 through weary gas blower fan 17.Weary gas cooler 18 is heat exchangers, has the cooling water tube bank in it, has condensation-water drain 21 and cold weary gas outlet on the weary gas cooler 18.
The exhaust outlet of drying device 14 connects the air inlet of medium-speed pulverizer 3 bottoms through Powder discharging fan 31.
Flue gas mixing-chamber 15 has two gas approach; The hot cigarette of one of them gas approach 25 connection boilers, 7 burner hearths through the high temperature boiler flue gas tube road is taken out mouth 24, and another gas approach is connected to the cold weary gas outlet (cold smoke that also can be connected to boiler 7 flues is taken out mouth) of weary gas cooler 18 through blast pipe road 36.In addition, also be connected with one blast pipe road 37 on this blast pipe road 36, this blast pipe road 37 is connected to Powder discharging fan 31.Cold weary gas outlet also is connected to desulfurizing tower 39 through another blast pipe road 38 that is connected on the blast pipe road 36.Can control the weary tolerance that gets into flue gas blender 15, Powder discharging fan 31 and desulfurizing tower 39 through adjusting blast pipe road 36 and two valves that prop up on the blast pipe road 37,38.
More than be exactly the flue gas drying brown coal medium-speed pulverizer pulverized coal preparation system of the utility model, its working method is following:
Raw coal is sent into drying device 14 from run coal bin 1 through feeder 2, and the high-temperature flue gas from flue gas mixing-chamber 15 gets into drying device 14 tops as the pre-dried drier of raw coal simultaneously, and the two mixes in drying device 14 and be descending.Raw coal after predrying gets into medium-speed pulverizer 3 by drying device 14 bottoms, and exhaust is got into the medium-speed pulverizer 3, as coal pulverizer drier and defeated powder medium to extracting out from drying device 14 bottom sides by Powder discharging fan 31.Medium-speed pulverizer drier initial temperature is through regulating from the weary gas of low temperature in a blast pipe road 37 in Powder discharging fan 31 inlet pipeline blending.
Grind in medium-speed pulverizer 3 through pre-dried raw coal; Wind powder mixture after grinding gets into mill separator 4; Isolated meal returns medium-speed pulverizer 3 to be continued to grind; Weary gas and qualified coal dust get into the gas solid separation that pulverized-coal collector 32 is accomplished the overwhelming majority, get into sack cleaner 16 then and further purify weary gas and reclaim fine powder, and all fine powders are sent into air and powder mixer 34 by machine supplying powder 33.Weary gas after sack cleaner 16 purifications delivers into weary gas cooler 18 through weary gas blower fan 17, and weary gas is cooled in weary gas cooler 18 below the water dew point temperature and lacks gas sensible heat and vapour latent heat to reclaim, and also obtains a large amount of condensate simultaneously.The cold weary gas one tunnel of being discharged by weary gas cooler 18 is sent to flue gas mixing-chamber 15 and Powder discharging fan 31 inlet ducts as temperature control medium, and another road directly is discharged into desulfurizing tower 39; But the low-temperature condensate of discharging by weary gas cooler 18 both after the water treatment by power plant's reuse, also can directly be discharged into the desulphurization system wastewater disposal basin.Certainly, lacking gas blower fan 17 also can be directly with the past desulfurizing tower 39 of moisture weary pneumatic transmission.
The air of being carried by pressure fan 9 distributes back through air and powder mixer 34 pulverized coal conveyings to each burner 6 to burn as a wind through bellows 11 through air preheater 8 heating backs one tunnel, and another road is sent to each burner 6 participation stove internal combustion as secondary wind through secondary air box 12 distribution.Seal fan 13 provides high pressure cold wind to be used for Seal of Equipment such as coal pulverizer, feeder.
At burner hearth hot cigarette is set and takes out mouth 24, utilize negative pressure extracting high temperature furnace cigarette and cold weary gas in the drying device 14, the two mixes the back and gets into drying device 14 in flue gas mixing-chamber 15.
Compare with existing medium-speed pulverizer pressurized direct pulverizing coal system, this patent system has following characteristics:
(1), raw coal is predrying fully through efficient, the former moisture content of coal that gets into medium-speed pulverizer significantly reduces, and the pulverized coal preparation system drying is exerted oneself and significantly improved, and makes combustion high-moisture brown coal unit can adopt medium-speed pulverizer pulverized coal preparation system safe and reliable to operation, that maintenance cost is low.
(2), adopt high-temperature flue gas as raw coal the drier in the predrying and coal pulverizer, the oxygen amount is low in the flue gas, whole pulverized coal preparation system moves under inert atmosphere, can effectively prevent the brown coal detonation, security significantly strengthens.
(3), can regulate the drier initial temperature through the ratio that changes hot cigarette and cold weary gas.The drying capacity adjustable range of drier is big, can satisfy the predrying demand of all kinds of high-moisture raw coal.
(4), all moisture of after pre-drying device and the further drying of coal pulverizer, removing of raw coal do not get into boiler furnace, can significantly improve coal powder performance, improve boiler efficiency, reduce air-introduced machine, coal pulverizer power consumption, thereby reduce gross coal consumption rate.
(5), reclaim the moisture in the weary gas, regional power plant has outstanding economy and environmental benefit for " rich coal lack of water ".
Embodiment 2
As shown in Figure 3, the difference of present embodiment and embodiment 1 is: be connected with Pulverized Coal Bin 41 before the machine supplying powder 33, the meal outlet of the meal outlet of said pulverized-coal collector 32 and deduster 16 all is connected to this Pulverized Coal Bin 41.In machine supplying powder 33 the place aheads Pulverized Coal Bin 41 is set, can makes the pulverized coal preparation system operation not receive the influence of boiler load, guarantee that pulverized coal preparation system can be stablized, efficiently operation.
In sum; Patent art makes combustion high-moisture brown coal unit adopt the medium-speed pulverizer pulverized coal preparation system to become possibility; Vast scale be can be implemented in the coal-fired unit that adopts the medium-speed pulverizer pulverized coal preparation system and burning brown coal or clean burn brown coal mixed; Also can improve unit efficiency and reduce gross coal consumption rate, reclaim great lot of water resources simultaneously, have remarkable economical, energy-conservation and environmental benefit.This patent system both can be applicable to mix burning at the brown coal of labour unit, also can be applicable to the station boiler of whole burning high-moisture brown coal.
It should be noted that; Above content is the further explain that combines concrete embodiment that the utility model is done; The specific embodiment that can not assert the utility model only limits to this; Under the above-mentioned guidance of the utility model, those skilled in the art can carry out various improvement and distortion on the basis of the foregoing description, and these improve or distortion drops in the protection domain of the utility model.
Claims (6)
1. flue gas drying brown coal medium-speed pulverizer pulverized coal preparation system, it includes medium-speed pulverizer, pressure fan, seal fan and is located at the air preheater in the boiler flue, and said pressure fan connects air preheater; The hot blast of air preheater outlet divides two-way; One the tunnel connects burner, and said seal fan connects the sealing air port of medium-speed pulverizer, and it is characterized in that: said medium-speed pulverizer is connected with drying device at the coal feed point at top; Said drying device top has coal feed point and high temperature flue gas drying agent inlet; The bottom has coal outlet, and bottom sides has exhaust outlet, and said exhaust outlet connects the air inlet of medium-speed pulverizer through Powder discharging fan; Said mill separator is connected with pulverized-coal collector; The meal outlet of pulverized-coal collector connects machine supplying powder; Machine supplying powder connects air and powder mixer, and another road hot blast of said air preheater also connects air and powder mixer through bellows, and the weary gas outlet of pulverized-coal collector connects deduster; The meal outlet of deduster connects machine supplying powder again, and the gas outlet of deduster connects weary gas blower fan.
2. flue gas drying brown coal medium-speed pulverizer pulverized coal preparation system according to claim 1 is characterized in that: said weary gas blower fan connects weary gas cooler, and weary air cooling but utensil has condensation-water drain and cold weary gas outlet.
3. flue gas drying brown coal medium-speed pulverizer pulverized coal preparation system according to claim 2; It is characterized in that: the high temperature flue gas drying agent of said drying device inlet is connected with flue gas mixing-chamber, and the cold weary gas that the hot cigarette that this flue gas mixing-chamber is connected at boiler furnace is respectively taken out mouthful with weary gas cooler exports.
4. flue gas drying brown coal medium-speed pulverizer pulverized coal preparation system according to claim 2; It is characterized in that: the high temperature flue gas drying agent of said drying device inlet is connected with flue gas mixing-chamber, and the hot cigarette that this flue gas mixing-chamber is connected at boiler furnace is respectively taken out and mouthful taken out mouth with the cold smoke of being located at boiler flue.
5. flue gas drying brown coal medium-speed pulverizer pulverized coal preparation system according to claim 3 is characterized in that: on the blast pipe road, have a blast pipe road that is connected to Powder discharging fan between said flue gas mixing-chamber and the cold weary gas outlet, this blast pipe road is provided with valve.
6. flue gas drying brown coal medium-speed pulverizer pulverized coal preparation system according to claim 1 is characterized in that: be connected with Pulverized Coal Bin before the said machine supplying powder, the meal outlet of said pulverized-coal collector and the meal outlet of deduster all are connected to this Pulverized Coal Bin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011202091581U CN202195493U (en) | 2011-06-20 | 2011-06-20 | Medium-speed milling pulverization system for flue gas-dried lignite |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011202091581U CN202195493U (en) | 2011-06-20 | 2011-06-20 | Medium-speed milling pulverization system for flue gas-dried lignite |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102840593A (en) * | 2011-06-20 | 2012-12-26 | 上海机易电站设备有限公司 | Fume dried lignite medium speed mill powder-making system |
| CN102927582A (en) * | 2012-11-05 | 2013-02-13 | 孙家鼎 | Bin storage type hot air powder-feeding tertiary-air-free combustion system |
| CN105387455A (en) * | 2014-09-02 | 2016-03-09 | 阿尔斯通技术有限公司 | A combustion system |
| CN108518685A (en) * | 2018-04-09 | 2018-09-11 | 浙江春晖环保能源股份有限公司 | A kind of circulating fluidized bed boiler |
| CN108758679A (en) * | 2018-07-23 | 2018-11-06 | 东方电气集团东方锅炉股份有限公司 | A kind of list medium half direct-firing blower mill pulverized coal preparation system of drying |
| CN113757713A (en) * | 2021-09-02 | 2021-12-07 | 东方电气集团东方锅炉股份有限公司 | Powder making system of coal mill with staged combustion furnace smoke mixing and drying fan for power |
-
2011
- 2011-06-20 CN CN2011202091581U patent/CN202195493U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102840593A (en) * | 2011-06-20 | 2012-12-26 | 上海机易电站设备有限公司 | Fume dried lignite medium speed mill powder-making system |
| CN102840593B (en) * | 2011-06-20 | 2015-04-01 | 上海援梦电力能源科技咨询中心 | Fume dried lignite medium speed mill powder-making system |
| CN102927582A (en) * | 2012-11-05 | 2013-02-13 | 孙家鼎 | Bin storage type hot air powder-feeding tertiary-air-free combustion system |
| CN105387455A (en) * | 2014-09-02 | 2016-03-09 | 阿尔斯通技术有限公司 | A combustion system |
| CN108518685A (en) * | 2018-04-09 | 2018-09-11 | 浙江春晖环保能源股份有限公司 | A kind of circulating fluidized bed boiler |
| CN108758679A (en) * | 2018-07-23 | 2018-11-06 | 东方电气集团东方锅炉股份有限公司 | A kind of list medium half direct-firing blower mill pulverized coal preparation system of drying |
| CN113757713A (en) * | 2021-09-02 | 2021-12-07 | 东方电气集团东方锅炉股份有限公司 | Powder making system of coal mill with staged combustion furnace smoke mixing and drying fan for power |
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Owner name: SHANGHAI YUANMENG ELECTRIC POWER ENERGY TECHNOLOGY Free format text: FORMER OWNER: SHANGHAI JIYI POWER STATION EQUIPMENT CO., LTD. Effective date: 20130815 |
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Effective date of registration: 20130815 Address after: 202150, Shanghai, Chongming County Town East River along No. 7, building 416, room 68 Patentee after: SHANGHAI YUANMENG ELECTRICITY ENERGY TECHNOLOGY CONSULTING CENTER Address before: 200437, 900, Quyang Road, Hongkou District, Shanghai, No. 3, 306-407 Patentee before: Shanghai Electric Power Generation Equipment Co., Ltd. |
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Granted publication date: 20120418 Effective date of abandoning: 20150401 |
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| RGAV | Abandon patent right to avoid regrant |