CN105202549B - Coal sludge mixture burning control system based on two medium flue gas dryings and Geldart-D particle - Google Patents
Coal sludge mixture burning control system based on two medium flue gas dryings and Geldart-D particle Download PDFInfo
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- CN105202549B CN105202549B CN201510678657.8A CN201510678657A CN105202549B CN 105202549 B CN105202549 B CN 105202549B CN 201510678657 A CN201510678657 A CN 201510678657A CN 105202549 B CN105202549 B CN 105202549B
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Abstract
The present invention relates to a kind of coal sludge mixture burning control system for being based on two medium flue gas dryings and Geldart-D particle, warehouse of sludge connection spray drying pipe, spray drying pipe is connected with mixing chamber, mixing chamber inlet is connected with Cyclone outlet flue all the way, it is another to lead up to cold smoke blower fan connection house outlet, spray drying pipe outlet one connects rotary feeder one, spray drying pipe outlet two connects cyclone separator, cyclone separator exhaust outlet is by cooling down condenser, weary gas blower fan connects CFBB, cyclone separator discharge port connects rotary feeder two, Limestone silo is connected with rotary feeder three, rotary feeder one, rotary feeder two and rotary feeder threeway overspray loader connection CFBB, injection loader air inlet connection roots blower.The functions such as the achievable sludge drying of the present invention is utilized with conveying, dried tail gas waste heat, sludge and coal multifuel combustion and pollutant catabolic gene, are conducive to preventing foul smell and dust recycling, with system is succinct, environment-friendly high-efficiency the characteristics of.
Description
Technical field
The present invention relates to a kind of waste treatment system, more particularly to a kind of sludge drying and with the system of coal multifuel combustion.
Background technology
As the yield and treating capacity of municipal sewage are increasing, the sludge produced in the processing procedure of municipal sewage
Also it is growing day by day.The flock that sludge is made up of moisture, organic granular and inorganic particle etc., wherein containing plurality of heavy metal,
Pathogen and difficult degradation toxic organic compound, can also emitting offensive odor.Therefore, it is necessary to be dealt carefully with to sludge.
The pretreatment of sludge has the technologies such as conditioning, concentration, dehydration, stabilisation and desiccation, and the final disposal of sludge mainly has
The emerging technologies such as the modes such as landfill, Land_use change, construction material utilization, biological treatment and burning, pyrolysis, gasification and pyrohydrolysis
Among research and development.Because all many requirements such as soil protection, ground water protection and food security are improved constantly, landfill
Increasing restraining factors are faced with the application of the conventional art such as Land_use change, is burned and other sludge treatment new technologies is rapid
Development.
According to the fuel that CIU is used, sludge incineration can be divided into individually burn and with other fuel mixed burnings two
Class；According to whether carrying out drying and other treatment, sludge incineration is divided into directly burning burns two classes with after desiccation；According to the burning for being used
Device, sludge incineration can be divided into grate furnace burning, fluidized combustion, melting furnace is burned, rotary kiln incineration and station boiler mix burning
Deng.
Because the dewatered sludge from sewage treatment plant typically also has compared with high-moisture percentage, calorific value is very low, directly enters stove burning
When, it is necessary to more auxiliary fuel, the ratio of burning mixed mud is relatively low, and treatment scale is small, and the flue gas loss of boiler is big, under the thermal efficiency
Drop.Stove burning will be reentered after dewatered sludge desiccation, the stability and treatment scale of burning in stove can be improved.
The widely used power plant's low-pressure steam of desiccation-incineration technology and other heating media are to from the aqueous of sewage treatment plant
Rate dewatered sludge higher is heated, make moisture in sludge further evaporation and obtain that moisture content is relatively low, that calorific value is higher is dry
Change sludge, then through being burned in dewatered sludge feeding system feeding boiler；The high-temperature flue gas that burning is produced are through heat recovery and only
Discharged after change treatment, so as to realize reducing sludge volume, decrement and innoxious.
Sludge heat drying link has direct desiccation, three kinds of typical process of indirectly drying and joint desiccation.Direct desiccation be
In operating process, thermal medium（Hot-air, heat smoke or hot ash etc.）With sludge directly contact, thermal medium low speed flows through sludge blanket,
The moisture in sludge is absorbed in the process, and the dewatered sludge after treatment need to be separated with thermal medium.A waste gas part for discharge
Used again in returning to original system by heat recovery system, remaining part is discharged after innoxious.Heat is situated between during indirectly drying
Matter is not contacted directly with sludge, but transfers heat to sludge by heat exchanger, the moisture in sludge is evaporated,
Thermal medium is generally 160-200 DEG C of saturated steam or conduction oil.The moisture evaporated during drying sludge in condenser plus
To condense, a part for thermal medium is recycled in returning to original system, with energy saving.Directly-indirect joint desiccation is combined
State two kinds of technologies.
In several conventional type of furnace of sludge incineration link, the processing capacity of grate furnace, melting furnace and rotary kiln is all relatively
It is small；The Fuel Consumption of large-scale fluidized bed boiler and pulverized-coal fired boiler is big, even if mixing the sludge for burning minor proportion, its dirt that can be realized
Mud treating capacity is still very big, and mixes and burn the sludge of minor proportion and will not produce burning in influence, stove steady on safe operation of the boiler
Fixed, temperature is high, pollutant complete decomposition, and these station boilers have been often equipped with advanced flue gas purification system, and it can be right
The pollutant that sludge incineration brings carries out purified treatment.It can be seen that, cooperative disposal is carried out to sludge using station boiler has well
Application prospect.
With reference to different sludge dryings and burning mode, in the sludge drying gone into operation-burning engineering, steaming is just generated
The different process routes such as burning, flue gas desiccation-rotary kiln incineration are mixed in vapour desiccation-fluidized combustion, steam desiccation-pulverized-coal fired boiler.
Because most engineerings are that the boiler controller system for putting into operation for many years is undergone technological transformation, increase sewage sludge storage, desiccation and induction system and
Into, the need for not considering sludge incineration during initial design boiler controller system, so the sludge drying workshop set up typically uses
Steam indirectly drying technique, the distance between its position and boiler by dewatered sludge generally farther out, it is necessary to first be transported to power plant
Coal yard is stored up, and then sends into pulverized coal preparation system using Belt Conveying mode, or be sent directly into burning in stove.This causes system flow to be answered
Miscellaneous, equipment is more, and floor space is big, and cost of investment is high；Again because the sludge after desiccation has airborne dust in stacking and course of conveying
Distributed with foul smell, and the sealing property of belt conveyor system is poor, so easily cause foul smell to be spread in plant area and near zone,
Cause work under bad environment, have a strong impact on the enthusiasm of power plant's burning sludge.At present, also there is the dirt based on fanned powder-grinding system
Mud flue gas desiccation-pulverized-coal fired boiler mixes firing technique scheme, but because sludge is in the fan mill during desiccation and grind into powder
The primary mixture of generation has stronger penetrating odor, corrosivity and dust concentration very high, and its gas powder is separated certain
Difficulty, requirement of explosion proof is also higher, there is not yet engineer applied.
Therefore for the need for power plant's burning sludge, development system is succinct, flow is short, environment-friendly high-efficiency sludge anhydration burning
Electricity generation system is necessary.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of coal-dirt for being based on two medium flue gas dryings and Geldart-D particle
Mud mixture burning control system, the system can stably carry out sludge drying, and realize sludge and the multifuel combustion of coal after desiccation, effectively control foul smell
And dust recycling, in overcoming the shortcomings of existing sludge incineration engineering.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that：
A kind of coal-sludge mixture burning control system for being based on two medium flue gas dryings and Geldart-D particle, including warehouse of sludge, screw rod
Pump, spray drying pipe, rotary feeder one, cyclone separator two, rotary feeder two, roots blower, injection loader, cooling
Condenser, weary gas blower fan, CFBB, Limestone silo, rotary feeder three, mixing chamber, cold smoke blower fan, the sludge
Warehouse discharging opening connects the charging aperture of spray drying pipe by screw pump, and the outlet of the air inlet and mixing chamber that are spray-dried pipe connects
Connect, the entrance point two-way of mixing chamber is connected, from recycle stream with the exhaust pass of cyclone separator one of CFBB all the way
The exhaust pass extracting high-temperature flue gas of cyclone separator one of fluidized bed boiler, separately leads up to going out for cold smoke blower fan connection deduster
Mouthful, cold flue gas are extracted from house outlet by cold smoke blower fan, mixing temperature adjustment is carried out in mixing chamber, mixed heat smoke is made
It is drying sludge medium；The connection rotary feeder one of outlet one of the spray drying pipe, makes to be deposited to the bottom of drying tube
The dry bulky grain sludge that is heated enters rotary feeder one, and the outlet two of the spray drying pipe connects cyclone separator two,
Make remaining mud granule and dry tail gas to carry out gas solid separation into cyclone separator together, the exhaust outlet of cyclone separator two according to
It is secondary to connect CFBB by cooling down condenser, weary gas blower fan, remove high cooling through cooling condenser containing wet weary gas
After wet, the dilute-phase zone for entering CFBB by weary gas blower fan burns, the discharge port connection of the cyclone separator two
Rotary feeder two, makes the mud granule isolated enter rotary feeder two；The Limestone silo connects with rotary feeder three
Connect, the limestone particle in Limestone silo is entered rotary feeder three；The rotary feeder one, rotary feeder two and rotation
The outlet for being given to glassware three is connected with the charging aperture of injection loader, and the air inlet for spraying loader is connected with roots blower, sprays
The outlet for penetrating loader is connected with CFBB, makes the dewatered sludge from rotary feeder one, rotary feeder two
After entering injection loader with the lime stone from rotary feeder three, carried by the compressed air exported from roots blower and sent
The emulsion zone for entering CFBB participates in burning.
The CFBB charging aperture connects feeding-coal bucket by feeder, the coal in feeding-coal bucket is sent through feeder
Enter the emulsion zone burning of CFBB；The outlet of the CFBB pass sequentially through deduster, desulfurizer,
Air-introduced machine connects chimney, and each heating surface that the high-temperature flue gas for producing burning flow through CFBB releases heat, through removing
After dirt device removes dust, it is divided into two-way, is extracted by cold smoke blower fan all the way, another road enters in desulfurizer, further removes cigarette
SO in gas2Enter smoke stack emission by air-introduced machine.
The beneficial effects of the invention are as follows：Using above-mentioned technical proposal, mixed by extracting high-temperature flue gas and low-temperature flue gas and adjusted
Directly contact drying is carried out to sludge after temperature, compared with steam indirectly drying technology widely used at present, can be significantly improved
The speed and treating capacity of drying sludge, and the waste heat of the weary gas of drying is reclaimed by cooling down condenser, energy consumption for drying is reduced, reduce dirty
Mud brings the moisture of boiler into, so as to reduce boiler export flue gas dew point temperature and heat loss due to exhaust gas, improves boiler thermal output；Burn
Equipment uses CFBB, enters the coal particle of stove burning and the average grain diameter general control of mud granule in several millimeters
Level, without sludge is ground into micron-sized particle diameter using the equipment such as fan mill, so as to reduce spray drying pipe
Entrance sludge granulation and the thereafter difficulty of gas solid separation；Extracted from the exhaust pass of cyclone separator one of CFBB high
In Pulverized Coal fired Boiler Furnace near exit extracting high-temperature Gas phase Smoke ratio in warm flue gas, and fan mill drying system, height is greatly reduced
Influence of the warm fume extraction to boiler heating surface Temperature Deviation and job security；CFBB can be given full play to take off
The function of sulphur, denitration and dedusting, effectively control sludge mix the pollutant emission of burning；Dewatered sludge is carried out using pneumatic conveying mode
With the conveying of lime stone, be conducive to improving the seal of course of conveying, prevent foul smell and dust to be outwards leaked in environment, be not required to
Dewatered sludge warehouse is set, the flexibility of front-furnace feeding device arrangement is improved.
Therefore, the coal-sludge mixture burning control system for being based on two medium flue gas dryings and CFBB proposed by the present invention,
Integrate sludge drying, burn and pollutant catabolic gene function, with system succinctly, environment-friendly high-efficiency the characteristics of.
Brief description of the drawings
Fig. 1 is system structure diagram of the invention.
Specific embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, in the coal-sludge multifuel combustion system for being based on two medium flue gas dryings and CFBB of the invention
System, including warehouse of sludge 1, screw pump 2, spray drying pipe 3, rotary feeder 1, cyclone separator 25, rotary feeder two
6th, roots blower 7, injection loader 8, cooling condenser 9, weary gas blower fan 10, CFBB 11, feeding-coal bucket 12, to coal
Machine 13, Limestone silo 14, rotary feeder 3 15, mixing chamber 16, deduster 17, cold smoke blower fan 18, desulfurizer 19, air-introduced machine
20 and chimney 21.
The outlet of feeding-coal bucket 12 is connected with feeder 13, and the outlet of feeder 13 is connected with CFBB 11, follows
The outlet of circulation fluidized bed boiler 11 is sequentially connected with deduster 17, desulfurizer 19, air-introduced machine 20, chimney 21；
Warehouse of sludge 1 is connected to screw pump 2, and the outlet of screw pump 2 is connected to the charging aperture of spray drying pipe 3, and spraying is dry
The air inlet of dry pipe 3 is connected with the outlet of mixing chamber 16, the entrance point two-way of mixing chamber 16, all the way with CFBB 11
The connection of the exhaust pass of cyclone separator 1, the outlet with cold smoke blower fan 18 all the way is connected, the entrance of cold smoke blower fan 18 with remove
Dirt device 17 outlet connection, be spray-dried pipe 3 outlet one be connected with rotary feeder 1, spray drying pipe 3 outlet two and
Cyclone separator 25 is connected, and the discharge port of cyclone separator 25 is connected with rotary feeder 26, the row of cyclone separator 25
Gas port is sequentially connected with cooling condenser 9, weary gas blower fan 10, and the outlet of weary gas blower fan 10 is connected to CFBB 11.
Limestone silo 14 is connected with rotary feeder 3 15, rotary feeder 1, rotary feeder 26 and rotation feed
The outlet of device 3 15 is connected with the charging aperture of injection loader 8, and the air inlet for spraying loader 8 is connected with roots blower 7, sprays
The outlet of loader 8 is connected with CFBB 11.
The operation principle for being based on the coal-sludge mixture burning control system of two medium flue gas dryings and CFBB is：
From the exhaust pass extracting high-temperature flue gas of cyclone separator 1 of CFBB 11, by cold smoke blower fan 18
Cold flue gas are extracted from the outlet of deduster 17, mixing temperature adjustment is carried out in mixing chamber 16, mixed heat smoke is used as drying sludge
Medium；The sludge in warehouse of sludge 1 is stored in, spray drying pipe 3 is transported to through screw pump 2, with the hot cigarette from mixing chamber 16
Gas mixes, and by heated drying, the sludge settling of bulky grain to the bottom of drying tube 3, into rotary feeder 1, remaining sludge
Particle carries out gas solid separation into cyclone separator 25 together with tail gas is dried, and height is lowered the temperature containing wet weary gas through cooling down condenser 9
After dehumidifying, the dilute-phase zone for entering CFBB 11 by weary gas blower fan 10 burns, and the mud granule isolated enters rotation
It is given to glassware 26；Limestone particle in Limestone silo 14 enters rotary feeder 3 15；From rotary feeder 1, rotation
After the dewatered sludge of dispenser 26 and the lime stone from rotary feeder 3 15 enter injection loader 8, by from Roots's wind
The emulsion zone that the compressed air of the outlet of machine 7 carries feeding CFBB 11 participates in burning；Burn the high-temperature flue gas for producing
Each heating surface for flowing through CFBB 11 releases heat, after removing dust device 17 removes dust, is divided into two-way, cold all the way
Cigarette blower fan 18 is extracted, and another road enters in desulfurizer 19, further the SO in removing flue gas2Enter chimney by air-introduced machine 20
21 discharges.
The system has the characteristics that：
（1）As the drier of sludge after extracting high-temperature flue gas and low-temperature flue gas mixing, this two media drying system leads to
The extraction ratio of high-temperature flue gas and low-temperature flue gas is overregulated, the need for being suitable for drying sludge Load Regulation；Sludge and flue gas are straight
Connect contact drying speed big, sludge conveying process is few, good leak tightness, and foul smell and dust can be prevented to be leaked in environment；
（2）Burning facility uses CFBB, is compared with coal-powder boiler, enters the coal particle and mud granule of stove burning
Average grain diameter it is larger, reduce spray drying tube inlet sludge granulation and the thereafter difficulty of gas solid separation；From recirculating fluidized bed
The exhaust pass extracting high-temperature flue gas of cyclone separator one of boiler whirlwind, also reduces high-temperature flue gas and extracts to boiler heating surface vapour
The influence of warm deviation and job security；
（3）Can be reclaimed more than the waste gas after drying sludge using unit condensate as the cooling medium in cooling condenser
Heat, reduces energy consumption for drying, reduces sludge and brings the moisture of boiler into, so as to reduce boiler export flue gas dew point temperature and exhaust gas heat loss
Lose, improve boiler thermal output.
（4）The conveying of dewatered sludge and lime stone is carried out using pneumatic conveying mode, with Belt Conveying and helical feed phase
Than, be conducive to improving the seal of course of conveying, prevent foul smell and dust to be outwards leaked in environment, it is not required to set dewatered sludge
Warehouse, improves the flexibility of front-furnace feeding device arrangement.
Therefore, the coal-sludge mixture burning control system of two medium flue gas dryings and CFBB should be based on, sludge was capable of achieving
The control functions such as desiccation is utilized with conveying, dried tail gas waste heat, sludge and coal multifuel combustion and pollutant, are conducive to preventing foul smell and powder
Dirt spreads, with system is succinct, environment-friendly high-efficiency the characteristics of, be a kind of new sludge treatment system.
Claims (2)
1. a kind of coal-sludge mixture burning control system for being based on two medium flue gas dryings and Geldart-D particle, including warehouse of sludge（1）, screw rod
Pump（2）, spray drying pipe（3）, rotary feeder one（4）, cyclone separator two（5）, rotary feeder two（6）, roots blower
（7）, injection loader（8）, cooling condenser（9）, weary gas blower fan（10）, CFBB（11）, Limestone silo（14）、
Rotary feeder three（15）, mixing chamber（16）, cold smoke blower fan（18）, it is characterised in that：The warehouse of sludge（1）Discharging opening passes through
Screw pump（2）Connection spray drying pipe（3）Charging aperture, spray drying pipe（3）Air inlet and mixing chamber（16）Outlet connect
Connect, mixing chamber（16）Entrance point two-way, all the way with CFBB（11）Cyclone separator one（22）Exhaust pass
Connection, from CFBB（11）Cyclone separator one（22）Exhaust pass extracting high-temperature flue gas, separately leads up to cold
Cigarette blower fan（18）Connection deduster（17）Outlet, by cold smoke blower fan（18）From deduster（17）Cold flue gas are extracted in outlet,
Mixing chamber（16）In carry out mixing temperature adjustment, mixed heat smoke is used as drying sludge medium；The spray drying pipe（3）Go out
Mouth one connects rotary feeder one（4）, make to be deposited to drying tube（3）The dry bulky grain sludge of being heated of bottom enter rotation
Dispenser one（4）, the spray drying pipe（3）Outlet two connection cyclone separator two（5）, make remaining mud granule and drying
Tail gas enters cyclone separator two together（5）Carry out gas solid separation, cyclone separator two（5）Exhaust outlet pass sequentially through cooling it is cold
Condenser（9）, weary gas blower fan（10）Connection CFBB（11）, make height containing wet weary gas through cooling down condenser（9）Cooling
After dehumidifying, by weary gas blower fan（10）Into CFBB（11）Dilute-phase zone burning, the cyclone separator two（5）
Discharge port connection rotary feeder two（6）, the mud granule isolated is entered rotary feeder two（6）；Limestone silo
（14）With rotary feeder three（15）Connection, makes Limestone silo（14）In limestone particle enter rotary feeder three（15）；
The rotary feeder one（4）, rotary feeder two（6）With rotary feeder three（15）Outlet with injection loader（8）'s
Charging aperture is connected, and sprays loader（8）Air inlet and roots blower（7）Connection, sprays loader（8）Outlet and recycle stream
Fluidized bed boiler（11）Connection, makes from rotary feeder one（4）, rotary feeder two（6）Dewatered sludge and come spinning to
Glassware three（15）Lime stone enter injection loader（8）Afterwards, by from roots blower（7）The compressed air of outlet carries feeding
CFBB（11）Emulsion zone participate in burning.
2. coal-sludge the mixture burning control system for being based on two medium flue gas dryings and Geldart-D particle according to claim 1, its feature
It is：The CFBB（11）Charging aperture passes through feeder（13）Connection feeding-coal bucket（12）, make feeding-coal bucket（12）In
Coal through feeder（13）Feeding CFBB（11）Emulsion zone burning；The CFBB（11）Go out
Mouth passes sequentially through deduster（17）, desulfurizer（19）, air-introduced machine（20）Connection chimney（21）, the high-temperature flue gas for producing burning
Flow through CFBB（11）Each heating surface release heat, removing dust device（17）After removing dust, it is divided into two-way, all the way
By cold smoke blower fan（18）Extract, another road enters desulfurizer（19）In, further remove the SO in flue gas2By air-introduced machine
（20）Into chimney（21）Discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510678657.8A CN105202549B (en) | 2015-10-20 | 2015-10-20 | Coal sludge mixture burning control system based on two medium flue gas dryings and Geldart-D particle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510678657.8A CN105202549B (en) | 2015-10-20 | 2015-10-20 | Coal sludge mixture burning control system based on two medium flue gas dryings and Geldart-D particle |
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| CN105202549A CN105202549A (en) | 2015-12-30 |
| CN105202549B true CN105202549B (en) | 2017-06-23 |
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| CN201510678657.8A Expired - Fee Related CN105202549B (en) | 2015-10-20 | 2015-10-20 | Coal sludge mixture burning control system based on two medium flue gas dryings and Geldart-D particle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106439892A (en) * | 2016-09-30 | 2017-02-22 | 上海垒锦环境科技中心 | Mixed powder preparation system with coal and sludge coupling combustion power generation |
| CN107388263A (en) * | 2017-05-05 | 2017-11-24 | 江苏绿威环保科技有限公司 | A kind of sludge collaboration burning processing system and processing method |
| CN107970725A (en) * | 2017-12-05 | 2018-05-01 | 浙江千尧环境工程有限公司 | Flue gas recirculation system |
| CN111408230A (en) * | 2020-04-22 | 2020-07-14 | 华能国际电力股份有限公司 | Wastewater recoverable integrated treatment system and method suitable for coal-fired power plant |
| CN112178623A (en) * | 2020-08-27 | 2021-01-05 | 烟台清泉实业有限公司 | Generating set for large-proportion mixed combustion of dried sludge |
| CN112762461A (en) * | 2020-12-30 | 2021-05-07 | 上海市政工程设计研究总院（集团）有限公司 | Sludge incineration equipment |
| CN113105130B (en) * | 2021-04-19 | 2022-03-15 | 河南省新思源电力科学研究院有限公司 | Circulating fluidized bed boiler structure |
| CN115949949B (en) * | 2022-12-29 | 2023-10-20 | 广东广业投资集团有限公司 | System and method for cooperatively drying and incinerating sludge by using household garbage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2001036873A1 (en) * | 1999-11-18 | 2001-05-25 | Fortum Engineering Oy | Method and apparatus for burning brown coal |
| CN101294765B (en) * | 2008-06-05 | 2010-09-29 | 神华集团有限责任公司 | Low rank coal high temperature flue gas drying method and device |
| CN101570388B (en) * | 2009-05-26 | 2010-11-03 | 华电滕州新源热电有限公司 | Harmless recycling treatment process for urban sludge |
| CN201753345U (en) * | 2010-07-09 | 2011-03-02 | 山东天力干燥设备有限公司 | Superheated steam reinforced circulation graded crushing upgrading system for lignite |
| CN102175031B (en) * | 2011-02-28 | 2013-01-23 | 邹炎 | System and method for integrating smoke purification and lignite quality-improvement into whole |
| CN103848550A (en) * | 2012-12-03 | 2014-06-11 | 上海理工大学 | Sludge drying and burning device with low NOx discharge and drying and burning method |
| CN203771439U (en) * | 2014-04-04 | 2014-08-13 | 西安西热锅炉环保工程有限公司 | High-moisture lignite medium speed mill coal pulverizing system using pulverized coal combustion heating primary air |
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