CN107314367A - Pulverized-coal fired boiler arrangement structure - Google Patents

Pulverized-coal fired boiler arrangement structure Download PDF

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Publication number
CN107314367A
CN107314367A CN201710611687.6A CN201710611687A CN107314367A CN 107314367 A CN107314367 A CN 107314367A CN 201710611687 A CN201710611687 A CN 201710611687A CN 107314367 A CN107314367 A CN 107314367A
Authority
CN
China
Prior art keywords
vertical gas
gas pass
superheater
swing
blade assembly
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.)
Pending
Application number
CN201710611687.6A
Other languages
Chinese (zh)
Inventor
陈益增
薛志芳
何雁飞
韦志平
薛金彪
时扶芃
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuxi Huaguang Boiler Co Ltd
Original Assignee
Wuxi Huaguang Boiler Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wuxi Huaguang Boiler Co Ltd filed Critical Wuxi Huaguang Boiler Co Ltd
Priority to CN201710611687.6A priority Critical patent/CN107314367A/en
Publication of CN107314367A publication Critical patent/CN107314367A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00Combustion apparatus characterised by arrangements for air supply
    • F23C7/002Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
    • F23C7/004Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
    • F23C7/006Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes adjustable
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B31/00Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
    • F22B31/08Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2201/00Staged combustion
    • F23C2201/10Furnace staging
    • F23C2201/101Furnace staging in vertical direction, e.g. alternating lean and rich zones
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/10Nitrogen; Compounds thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/10Nitrogen; Compounds thereof
    • F23J2215/101Nitrous oxide (N2O)
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)

Abstract

The invention provides a kind of pulverized-coal fired boiler arrangement structure, it uses high parameter to configure, the thermal efficiency of boiler can be provided to greatest extent, and it can reach the saving energy and improve the purpose of environment, it includes burner hearth, main burner, spout, horizontal flue, vertical gas pass, superheater, economizer, denitrification apparatus, air preheater, collect flue, exhaust pass, main burner and the spout above main burner are arranged in burner hearth, it is the arrival end of horizontal flue above burner hearth, the port of export connection vertical gas pass of horizontal flue, superheater uses small-bore pipe, the arrangement of many number of turns is in horizontal flue, vertical gas pass includes the first vertical gas pass and the second vertical gas pass being vertically arranged in parallel, denitrification apparatus is provided between first vertical gas pass and the second vertical gas pass, the lower exit port end of second vertical gas pass is exhaust pass.

Description

Pulverized-coal fired boiler arrangement structure
Technical field
The present invention relates to pulverized-coal fired boiler technical field, specially a kind of pulverized-coal fired boiler arrangement structure.
Background technology
In industrial circle, the effect of boiler is improved constantly, and it acts not only as the power source of equipment also can be as setting Standby heating power source, its furnace heat transfer process is by many factors such as fuel, stove internal heating surface, position, plaster layer thickness, grieshoch temperature Influence, meanwhile, it is empty that the levels of precision of boiler thermodynamic calculation also tends to have influence on exhaust gas temperature, overheat temperature, reheating temperature, heat The accuracy of temperature degree design load.The low capacity pulverized-coal fired boiler generally existing thermal efficiency of the prior art is asked less than design level Topic, and it uses low parameter configuration substantially, there is high energy consumption, inefficient, the defect of heavily contaminated.
The content of the invention
There are problems that parameter configuration is low, energy consumption is big, efficiency is low for prior art Small And Medium Capacity boiler, The invention provides a kind of pulverized-coal fired boiler arrangement structure, it uses high parameter to configure, and the thermal effect of boiler can be provided to greatest extent Rate, and can reach the saving energy and improve the purpose of environment.
A kind of pulverized-coal fired boiler arrangement structure, it includes burner hearth, main burner, spout, horizontal flue, vertical gas pass, superheater, province Coal device, denitrification apparatus, air preheater, collect flue, exhaust pass, the main burner and the spray above the main burner Mouth is arranged in the burner hearth, is the arrival end of the horizontal flue, the port of export of the horizontal flue above the burner hearth Connect the vertical gas pass, it is characterised in that pendant superheater, high temperature superheater, low temperature superheater be successively in the superheater It is arranged in the horizontal flue, the economizer, air preheater are located in the vertical gas pass, the vertical gas pass includes vertical The first vertical gas pass and the second vertical gas pass of parallel arrangement, set between first vertical gas pass and second vertical gas pass It is equipped with the denitrification apparatus;The lower exit port end of second vertical gas pass is the exhaust pass.
It is further characterized by,
The economizer includes high-temperature economizer, low-level (stack-gas) economizer;
The air preheater includes high temperature air preheater, middle temperature air preheater, low temperature air preheater;
The pendant superheater, high temperature superheater, low temperature superheater are serpentine-like to be sequentially arranged in the horizontal flue, described Pendant superheater is arranged in the top of the burner hearth, and the low temperature superheater is arranged in the port of export of the horizontal flue;It is described High-temperature economizer, the high temperature air preheater are sequentially arranged in first vertical gas pass, the low-level (stack-gas) economizer, the middle temperature Air preheater, the low temperature air preheater are sequentially arranged in second vertical gas pass;
The spout includes wind snout, an overfire air port, and a wind snout is arranged two layers, the overfire air port cloth Three layers are put, the overfire air port includes one layer of traditional method of indicating the pronunciation of a Chinese character spout and burns wind snout two layers;
The fire air nozzle includes pipeline, and the outlet area of pipeline is provided with oscillating vane, and oscillating vane, which is divided into, swings up and down leaf Piece component, swing blade assembly, swings up and down blade assembly, swings blade assembly not in same plane region, Swing up and down blade assembly and be connected with and swing up and down pull bar, the blade assembly that swings is connected with the pull bar that swings;
Swing up and down blade assembly, the blade component structure that swings includes blade, blade rotor, vane nose fastening group respectively Part, middle part of blade sets correspondence to be set in blade rotor, the inwall for being supported at both ends in pipeline of blade rotor, the front end point of blade Vane nose fastening assembly is not supported on, blade is arranged in parallel, swing up and down blade assembly, the blade assembly that swings difference By connecting shaft connect it is corresponding swing up and down blade assembly, swing blade assembly, swings up and down pull bar, swing drawing The input of bar is connected to handle.
Apply the present invention to pendant superheater, high temperature superheater, low temperature superheater in low capacity boiler, the superheater Being sequentially arranged in the horizontal flue, both ensure that the mass velocity that Safety of Superheater operation must reach, foot is provided again Enough heating surface areas;According to the arrangement of denitrification integral, denitrification apparatus is set after high temperature air preheater, control is rational de- Smoke of gunpowder temperature window, it is ensured that denitrating catalyst reaction temperature is in optimal interval, so as to ensure that low capacity boiler is high in high temperature Press under parameter configuration, the thermal efficiency of boiler can be provided to greatest extent, realize the saving energy and improve the purpose of environment;First air Spout arranges that overfire air port arranges that three layers can effectively weaken the rotated residual of furnace outlet, eliminate furnace outlet two layers Gas temperature windage, be may be implemented in actual moving process, and the height of reducing zone is adjusted according to actual conditions;Further ensure little Rong Boiler is measured under HTHP parameter configuration, the thermal efficiency of boiler can be provided to greatest extent.
Brief description of the drawings
Fig. 1 is arrangement schematic diagram of the invention;
Fig. 2 is the structural representation of fire air nozzle of the present invention;
Fig. 3 for Fig. 2 C to structural representation(Only show nozzle exit area region);
Fig. 4 is the assembly structure diagram between oscillating vane component of the present invention and corresponding swing pull bar;
Fig. 5 is Fig. 2 top view schematic diagram;
Fig. 6 is the structural representation of superheater of the present invention.
Embodiment
As shown in Figures 1 to 6, a kind of pulverized-coal fired boiler arrangement structure, it includes burner hearth 1, main burner 2, spout 3, level Flue 4, vertical gas pass 5, superheater, economizer, denitrification apparatus 6, air preheater, exhaust pass 7, main burner and positioned at main burning The spout 3 of the top of device 2 is arranged in burner hearth 1, and spout 3 includes wind snout, an overfire air port, a wind snout arrangement two Layer, three layers of overfire air port, overfire air port includes one layer of traditional method of indicating the pronunciation of a Chinese character spout and burns wind snout for two layers, and fire air nozzle includes pipe Road 18, the outlet area of pipeline 18 is provided with oscillating vane, oscillating vane be divided into swing up and down blade assembly 19, swing blade Component 20, swings up and down blade assembly 19, swings blade assembly 20 not in same plane region, swing up and down blade group Part 19, which is connected with, swings up and down pull bar 21, and the blade assembly that swings is connected with the pull bar 22 that swings;
Swing up and down blade assembly 19, the structure of blade assembly 20 that swings and specifically include blade 23, blade rotor 24, blade Front end fastening assembly 25, the middle part of blade 23 sets correspondence to be set in blade rotor 24, and blade rotor 24 is supported at both ends in pipeline 18 inwall, the front end of blade 23 is supported on the front end fastening assembly 25 of blade 23 respectively, and blade 23 is arranged in parallel, swung up and down Blade assembly 19, swing blade assembly 20 respectively by connecting shaft 26 connect it is corresponding swing up and down blade assembly 19, it is left Right oscillating vane component 20, swings up and down pull bar 21, the input for the pull bar 22 that swings and is connected to handle 27;Burner hearth 1 Top is the arrival end of horizontal flue 4, and the port of export connection vertical gas pass 5 of horizontal flue 4, superheater is located in horizontal flue 4, It uses small-bore pipe, the arrangement of many number of turns, including pendant superheater 8, high temperature superheater 9, low temperature superheater 10, shields formula Superheater 8, high temperature superheater 9, low temperature superheater 10 are sequentially arranged in horizontal flue 4, and pendant superheater 8 is arranged in burner hearth 1 Top, low temperature superheater 10 is arranged in the port of export of horizontal flue 4;Economizer, air preheater are located in vertical gas pass 5, save coal Device includes high-temperature economizer 11, low-level (stack-gas) economizer 12, and it is empty pre- that air preheater includes high temperature air preheater 13, middle temperature air preheater 14, low temperature Device 15, vertical gas pass 5 includes the first vertical gas pass 16 and the second vertical gas pass 17 that are vertically arranged in parallel, high-temperature economizer 11, High temperature air preheater 13 is sequentially arranged in the first vertical gas pass 16, low-level (stack-gas) economizer 12, middle temperature air preheater 14, low temperature air preheater 15 It is sequentially arranged in the second vertical gas pass 17, denitrification apparatus 6 is provided between the first vertical gas pass 16 and the second vertical gas pass 17, The lower exit port end of second vertical gas pass 17 is the exhaust pass 7.
Foundation《Boiler controller system thermodynamic computing standard》It is basic for boiler thermodynamic calculation, priority control furnace volume heat release rate, In furnace profile thermic load, main burner section wall area thermic load, last air port center to screen bottom distance, last air port The heart extremely shields the index of the flue gas mean residence time at bottom;
The operation principle of the lower present invention is described below in conjunction with the accompanying drawings:Apply the present invention to low capacity boiler, boiler powder is used The direct-firing system of medium-speed pulverizer, sends coal dust into burner hearth 1, and coal dust burns through main burner 2, and the flue gas of generation is interior under in burner hearth 1 And upper flowing, dried from spout 3, the overfire air port in spout 3 uses traditional method of indicating the pronunciation of a Chinese character technology, effectively weaken the rotation that burner hearth 1 is exported Remnants, eliminate above and below the blade in furnace outlet gas temperature deviation, the fire air nozzle of spout 3, swing ± 15 °, make after-flame Wind snout air quantity accounts for 25% to the 30% of total blast volume, effectively the discharge of reduction nitrogen oxides in effluent, while by the swing of blade, Realize in actual moving process, the height of reducing zone is adjusted according to actual conditions;Flue gas rises to horizontal flue 4, passes through successively Pendant superheater 8, high temperature superheater 9, the low temperature superheater 10 crossed in horizontal flue 4, it is ensured that Safety of Superheater operation must reach The mass velocity arrived, provides enough heating surface areas again;Flue gas near first vertical gas pass 16 under the port of export of horizontal flue 4 It is interior, high-temperature economizer 11, the high temperature air preheater 13 in the first vertical gas pass 16 are flowed through, into denitrification apparatus 6, control is rational de- Smoke of gunpowder temperature window, it is ensured that denitrating catalyst reaction temperature is in optimal interval;Flue gas enters the second vertical cigarette by denitrification apparatus 6 Road 17, sequentially passes through low-level (stack-gas) economizer 12, middle temperature air preheater 14, low temperature air preheater 15, is excluded from exhaust pass 7.So as to ensure Low capacity boiler can provide the thermal efficiency of boiler to greatest extent under HTHP parameter configuration.

Claims (7)

1. a kind of pulverized-coal fired boiler arrangement structure, it include burner hearth, main burner, spout, horizontal flue, vertical gas pass, superheater, Economizer, denitrification apparatus, air preheater, collect flue, exhaust pass, the main burner and above the main burner Spout is arranged in the burner hearth, is the arrival end of the horizontal flue, the outlet of the horizontal flue above the burner hearth The end connection vertical gas pass, it is characterised in that in the superheater pendant superheater, high temperature superheater, low temperature superheater according to Secondary to be arranged in the horizontal flue, the economizer, air preheater are located in the vertical gas pass, and the vertical gas pass includes perpendicular To the first vertical gas pass and the second vertical gas pass of parallel arrangement, between first vertical gas pass and second vertical gas pass It is provided with the denitrification apparatus;The lower exit port end of second vertical gas pass is the exhaust pass.
2. a kind of pulverized-coal fired boiler arrangement structure according to claim 1, it is characterised in that:The economizer is saved including high temperature Coal device, low-level (stack-gas) economizer.
3. a kind of pulverized-coal fired boiler arrangement structure according to claim 1, it is characterised in that:It is empty that the air preheater includes high temperature Pre- device, middle temperature air preheater, low temperature air preheater.
4. a kind of pulverized-coal fired boiler arrangement structure according to claim 1,2 or 3 any one, it is characterised in that:The screen formula Superheater, high temperature superheater, low temperature superheater are serpentine-like to be sequentially arranged in the horizontal flue, the pendant superheater cloth The top of the burner hearth is placed in, the low temperature superheater is arranged in the port of export of the horizontal flue;The high-temperature economizer, institute High temperature air preheater is stated to be sequentially arranged in first vertical gas pass, it is the low-level (stack-gas) economizer, the middle temperature air preheater, described low Warm air preheater is sequentially arranged in second vertical gas pass.
5. a kind of pulverized-coal fired boiler arrangement structure according to claim 1, it is characterised in that:The spout sprays including First air Mouth, overfire air port, a wind snout arrange that the overfire air port arranges three layers, the overfire air port bag two layers Include one layer of traditional method of indicating the pronunciation of a Chinese character spout and burn wind snout two layers.
6. a kind of pulverized-coal fired boiler arrangement structure according to claim 5, it is characterised in that:The fire air nozzle includes pipe Road, the outlet area of pipeline is provided with oscillating vane, oscillating vane be divided into swing up and down blade assembly, swing blade assembly, Swing up and down blade assembly, swing blade assembly not in same plane region, swing up and down blade assembly and be connected with Lower swing pull bar, the blade assembly that swings is connected with the pull bar that swings.
7. a kind of pulverized-coal fired boiler arrangement structure according to claim 6, it is characterised in that:Swing up and down blade assembly, a left side Right oscillating vane modular construction specifically includes blade, blade rotor, vane nose fastening assembly, and middle part of blade sets correspondence set Loaded on blade rotor, the inwall for being supported at both ends in pipeline of blade rotor, the front end of blade is supported on vane nose fastening respectively Component, blade is arranged in parallel, and swings up and down blade assembly, the blade assembly that swings and connects corresponding by connecting shaft respectively Swing up and down blade assembly, swing blade assembly, swing up and down pull bar, the input for the pull bar that swings and be connected to Handle.
CN201710611687.6A 2017-07-25 2017-07-25 Pulverized-coal fired boiler arrangement structure Pending CN107314367A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710611687.6A CN107314367A (en) 2017-07-25 2017-07-25 Pulverized-coal fired boiler arrangement structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710611687.6A CN107314367A (en) 2017-07-25 2017-07-25 Pulverized-coal fired boiler arrangement structure

Publications (1)

Publication Number Publication Date
CN107314367A true CN107314367A (en) 2017-11-03

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107795979A (en) * 2017-11-09 2018-03-13 无锡华光锅炉股份有限公司 Pendant superheater structure
CN108050508A (en) * 2017-11-07 2018-05-18 华中科技大学 A kind of biomass pyrolytic standby firing system for being integrated in vertical well gas flue after pulverized-coal fired boiler

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102620286A (en) * 2012-04-10 2012-08-01 无锡华光锅炉股份有限公司 Nozzle structure for overfired air of boiler combustor
CN102721076A (en) * 2012-07-04 2012-10-10 无锡华光锅炉股份有限公司 Boiler structure with de-nitrating device
CN204880178U (en) * 2015-08-17 2015-12-16 蓝天环保设备工程股份有限公司 Denitrification facility arrangement structure suitable for following boiler of 220th
CN105202556A (en) * 2015-10-14 2015-12-30 中国华能集团清洁能源技术研究院有限公司 Boiler tail flue structure capable of adjusting temperature of main steam and reheated steam and flue gas temperature
CN105485667A (en) * 2015-06-18 2016-04-13 无锡华光锅炉股份有限公司 Pulverized coal reheating boiler
CN106168376A (en) * 2016-08-29 2016-11-30 营口绿源锅炉有限责任公司 A kind of twin furnace coal dust gasification low nitrogen burning Industrial Boiler
CN106287751A (en) * 2016-01-18 2017-01-04 无锡华光锅炉股份有限公司 A kind of multiple waste liquid waste gas fuels and boiler plant of denitrification integral of burning
CN106949446A (en) * 2017-03-21 2017-07-14 苏州海陆重工股份有限公司 It is matched in the HTHP denitration waste heat boiler of catalytic cracking unit
CN207394823U (en) * 2017-07-25 2018-05-22 无锡华光锅炉股份有限公司 A kind of pulverized-coal fired boiler arrangement structure

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102620286A (en) * 2012-04-10 2012-08-01 无锡华光锅炉股份有限公司 Nozzle structure for overfired air of boiler combustor
CN102721076A (en) * 2012-07-04 2012-10-10 无锡华光锅炉股份有限公司 Boiler structure with de-nitrating device
CN105485667A (en) * 2015-06-18 2016-04-13 无锡华光锅炉股份有限公司 Pulverized coal reheating boiler
CN204880178U (en) * 2015-08-17 2015-12-16 蓝天环保设备工程股份有限公司 Denitrification facility arrangement structure suitable for following boiler of 220th
CN105202556A (en) * 2015-10-14 2015-12-30 中国华能集团清洁能源技术研究院有限公司 Boiler tail flue structure capable of adjusting temperature of main steam and reheated steam and flue gas temperature
CN106287751A (en) * 2016-01-18 2017-01-04 无锡华光锅炉股份有限公司 A kind of multiple waste liquid waste gas fuels and boiler plant of denitrification integral of burning
CN106168376A (en) * 2016-08-29 2016-11-30 营口绿源锅炉有限责任公司 A kind of twin furnace coal dust gasification low nitrogen burning Industrial Boiler
CN106949446A (en) * 2017-03-21 2017-07-14 苏州海陆重工股份有限公司 It is matched in the HTHP denitration waste heat boiler of catalytic cracking unit
CN207394823U (en) * 2017-07-25 2018-05-22 无锡华光锅炉股份有限公司 A kind of pulverized-coal fired boiler arrangement structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108050508A (en) * 2017-11-07 2018-05-18 华中科技大学 A kind of biomass pyrolytic standby firing system for being integrated in vertical well gas flue after pulverized-coal fired boiler
CN107795979A (en) * 2017-11-09 2018-03-13 无锡华光锅炉股份有限公司 Pendant superheater structure

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Application publication date: 20171103

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