CN113154432A - Biomass power generation system and method coupled with coal burner unit - Google Patents

Biomass power generation system and method coupled with coal burner unit Download PDF

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Publication number
CN113154432A
CN113154432A CN202110444153.5A CN202110444153A CN113154432A CN 113154432 A CN113154432 A CN 113154432A CN 202110444153 A CN202110444153 A CN 202110444153A CN 113154432 A CN113154432 A CN 113154432A
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CN
China
Prior art keywords
biomass
coal
powder
primary
power generation
Prior art date
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Pending
Application number
CN202110444153.5A
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Chinese (zh)
Inventor
王志超
张喜来
杨忠灿
郭洋洲
李宇航
周广钦
黄钢英
司小飞
姚伟
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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Publication date
Application filed by Xian Thermal Power Research Institute Co Ltd filed Critical Xian Thermal Power Research Institute Co Ltd
Priority to CN202110444153.5A priority Critical patent/CN113154432A/en
Publication of CN113154432A publication Critical patent/CN113154432A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10Adaptations for driving, or combinations with, electric generators
    • 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
    • F23J15/022Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02Pneumatic feeding arrangements, i.e. by air blast
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L1/00Passages or apertures for delivering primary air for combustion 
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00Heating of air supplied for combustion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N3/00Regulating air supply or draught
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/10Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001Drying-air generating units, e.g. movable, independent of drying enclosure
    • 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

Abstract

The invention discloses a biomass power generation system and method coupled with a coal burner set, which comprises a crusher, a conveyor, a hammer mill and a booster fan, wherein the crusher is arranged on the conveyor; the exit linkage of crusher is to the input of conveyer, and the output of conveyer is connected to the living beings powder import of hammer mill, still is connected with a wind bypass pipeline on the hammer mill, and the living beings powder export of hammer mill is connected to the primary powder pipe of boiler through the booster fan that sets up on living beings powder pipeline and the living beings powder pipeline. The invention is simple and efficient, avoids the great influence on the output of the coal mill of the unit in the co-grinding or molding mixed combustion process, and can reduce the system investment of the independent jet combustion process and the influence on the modification of the boiler.

Description

Biomass power generation system and method coupled with coal burner unit
Technical Field
The invention belongs to the technical field of coal-fired coupled biomass power generation, and particularly relates to a coal-fired unit coupled biomass power generation system and method with low modification cost and high biomass adaptability.
Background
The biomass energy is a high-quality Clean (CO) with huge reserves and wide distribution2Zero emission), properly utilizing biomass energy will be towards CO2Emission reduction plays a great role, and the biomass combustion power generation technology is an environment-friendly, efficient and economical large-scale utilization technology, so that the biomass combustion power generation technology is more and more widely regarded by the energy field at home and abroad. At present, in vast rural areas of China, most biomass straws are directly burned and returned to the field, so that huge energy waste and environmental pollution are caused, and the problem of how to effectively utilize straw resources becomes a general concern.
At present, coal-fired coupling biomass power generation mainly comprises two technical routes of biomass direct combustion and biomass gasification co-combustion, wherein although biomass gasification has the characteristic of easy metering, the biomass gasification investment and the operation cost are very high, the biomass gasification has no economy at all under the condition of no policy subsidy, and almost all biomass gasification projects are in a pause state. The biomass direct combustion process can be divided into a co-grinding process, an independent jet combustion process, a forming and blending combustion process and the like, as shown in table 1, the co-grinding process and the biomass forming and blending combustion process do not need to be modified by boiler equipment, the equipment investment is not additionally increased, and the two blending combustion processes are simple and are both suitable for biomass blending combustion with a small proportion. However, in the co-grinding process, the air temperature at the inlet and the outlet of the coal mill can be controlled only according to the temperature of the pulverized coal, and the biomass spontaneous combustion risk exists. Although the biomass forming blending combustion process adopted by a certain power plant can meet the biomass blending combustion requirement, the process can increase the power consumption of a powder making system due to the operation of one standby mill, and in addition, the biomass forming cost is higher and the output of the powder making system is greatly influenced by biomass. According to the research results of a certain foreign power plant, the biomass is mixed and burned by adopting a co-grinding process in the first 5 years, due to the large mixed combustion ratio and the characteristic difference between biomass fuel and raw coal, a coal mill powder making system has a certain degree of inadaptability and high fault, and is transformed in 2011 to implement an independent jet combustion process, but the independent jet combustion process needs to add a whole set of crushing, conveying and burning devices, so that the overall investment cost is high.
TABLE 1 comparison of different direct biomass blending combustion processes
Disclosure of Invention
The invention aims to provide a coal-fired unit coupling biomass power generation system and method with low modification cost and high biomass adaptability.
The invention is realized by adopting the following technical scheme:
a biomass power generation system coupled with a coal burner set comprises a crusher, a conveyor, a hammer mill and a booster fan; the exit linkage of crusher is to the input of conveyer, and the output of conveyer is connected to the living beings powder import of hammer mill, still is connected with a wind bypass pipeline on the hammer mill, and the living beings powder export of hammer mill is connected to the primary powder pipe of boiler through the booster fan that sets up on living beings powder pipeline and the living beings powder pipeline.
The invention further improves the method and the device and also comprises a biomass stock ground, wherein an outlet of the biomass stock ground is connected to an inlet of the crusher.
The invention has the further improvement that the particle diameter of the biomass powder after being treated by the hammer mill is not more than 2 mm.
The invention further improves the method and the device, and further comprises an air preheater and a control valve, wherein primary air is supplied through the air preheater, and the control valve on the primary air bypass pipeline regulates the flow.
The biomass powder pipeline is further improved in that a thermometer and a first pressure gauge are arranged on the biomass powder pipeline, and a second pressure gauge is arranged on the primary powder pipe.
The invention further improves the coal bunker and the coal mill, wherein the outlet of the coal bunker is connected to the inlet of the coal mill, and the outlet of the coal mill is connected to the primary powder pipe.
The invention further improves the method and the device, and further comprises a steam turbine and a generator, wherein the steam generated by the boiler drives the generator to generate electricity through the steam turbine.
The invention has the further improvement that the boiler also comprises a dust remover, a desulfurizing tower and a chimney, and a tail gas flue of the boiler is connected to the chimney through the dust remover and the desulfurizing tower in sequence.
A coal burner train coupled biomass power generation method, comprising:
the method comprises the following steps that original biomass stored in a biomass stock ground is firstly primarily crushed by a crusher and then enters a conveyor, an iron removal device is arranged on a conveyor belt of the conveyor to remove iron-containing substances mixed in the biomass, the biomass after primary crushing and iron removal is conveyed into a hammer mill by the conveyor to be crushed and dried, a biomass drying heat source and a carrying medium are primary air conveyed by a primary air bypass pipeline, the air quantity of the primary air is controlled by a control valve, the biomass powder meeting the particle size requirement is carried by the bypass primary air and is pressurized by a booster fan, then the biomass powder is conveyed into an original primary powder pipe of a coal-fired unit by a biomass powder pipeline, and the biomass powder and the pulverized coal ground by a coal bunker and a coal mill are fully mixed and then conveyed into a boiler to be combusted, so that the coupling process of the biomass and the coal is realized; by monitoring the pressure difference between the booster fan outlet pressure gauge and the coal mill outlet primary powder pipe pressure gauge, the outlet pressure of the booster fan is ensured to be higher than the primary powder pipe pressure, so that the biomass powder can be smoothly fed into the primary powder pipe to realize effective mixing.
The invention has at least the following beneficial technical effects:
the invention provides a biomass power generation system and method coupled with a coal burner group, which are characterized in that collected original biomass is firstly subjected to primary crushing and then further crushed, and is mixed with hot primary air from an outlet of an air preheater of the coal burner group in hammer mill equipment, biomass powder meeting the requirement of particle size is taken out by the primary air and then is pressurized by a booster fan, and then the biomass powder is sent into a primary powder pipe at an outlet of a coal mill to be fully mixed with pulverized coal, and finally the biomass powder is sent into a boiler through an original combustor to be combusted, so that the high-efficiency coupling of coal and the biomass is realized. The system is simple and efficient, avoids the great influence on the output of a unit coal mill in a co-grinding or forming mixed combustion process, and can reduce the system investment of an independent jet combustion process and the influence on the modification of a boiler. In summary, the present invention has the following advantages:
1. the biomass has high cellulose content, is not suitable for adopting a grinding type powder preparation mode of a traditional coal mill of a coal-fired unit, has great influence on the powder preparation force, the blockage problem and the like of the biomass, and is more suitable for adopting a biomass powder preparation mode of crushing and hammering crushing;
2. the biomass powder which is pulverized to be less than 2mm hardly has the problems of pipeline blockage and high-efficiency combustion, and is dried, carried and conveyed by primary air, so that the primary air allowance after partial coal combustion can be effectively replaced by the biomass, and the requirement of the primary fan allowance of a coal-fired unit is not increased;
3. the pressure difference between the biomass powder pipe and the primary powder pipe is monitored, and the booster fan is controlled to boost primary air carrying biomass powder, so that the biomass powder can be smoothly fed into the primary powder pipe, and the biomass powder and coal powder are fully mixed;
4. the original primary powder pipeline and the combustor of the coal-fired unit are used for sending the biomass powder into the hearth of the boiler for combustion, so that the biomass blending combustion process is effectively simplified, the transformation of the original coal-fired unit equipment is hardly involved, and the influence on the combustion, operation and control of the original coal-fired unit can be reduced.
In summary, the invention provides a biomass power generation system coupled with a coal burner setAnd methodThe biomass energy-saving biomass energy-saving system has the advantages that the biomass can be efficiently treated and the biomass can be sufficiently coupled with fire coal by adding partial biomass crushing, pulverizing and pressurizing equipment and utilizing primary air, a primary powder pipeline, a combustion system and the like of the original coal-fired unit, the adaptability of the biomass energy-saving biomass energy-saving system is good in adaptability with the unit system, and the safe and stable operation of the original system cannot be influenced. The invention can provide a new way for coal and carbon reduction of the thermal power generating unit and has remarkable social and environmental benefits.
Drawings
FIG. 1 is a schematic diagram of a coal burner block coupled biomass power generation system of the present invention.
Description of reference numerals:
1. a biomass stock ground; 2. a crusher; 3. a conveyor; 4. a hammer mill; 5. a booster fan; 6. a control valve; 7. a primary air bypass duct; 8. a biomass powder pipeline; 9. a coal mill; 10. a primary powder tube; 11. a first pressure gauge; 13. a coal bunker; 14. a boiler; 15. a thermometer; 16. a second pressure gauge; 17. an air preheater; 18. a dust remover; 19. a desulfurizing tower; 20. a chimney; 21. a steam turbine; 22. an electric generator.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the coal burner group-coupled biomass power generation system provided by the invention comprises a biomass stock ground 1, a crusher 2, a conveyor 3, a hammer mill 4, a control valve 6, a booster fan 5, a coal mill 9, a coal bunker 13, an air preheater 17, a dust remover 18, a desulfurizing tower 19, a chimney 20, a steam turbine 21 and a power generator 22.
The outlet of the biomass stock ground 1 is connected to the inlet of the crusher 2, the outlet of the crusher 2 is connected to the input end of the conveyor 3, the output end of the conveyor 3 is connected to the biomass powder inlet of the hammer mill 4, the hammer mill 4 is further connected with a primary air bypass pipeline 7, and the biomass powder outlet of the hammer mill 4 is connected to a primary powder pipe 10 of the boiler 14 through a biomass powder pipeline 8 and a booster fan 5 arranged on the biomass powder pipeline 8. Primary air is supplied through an air preheater 17 and the flow is regulated by a control valve 6 on the primary air bypass duct 7. The outlet of the coal bunker 13 is connected to the inlet of the coal mill 9, and the outlet of the coal mill 9 is connected to the primary powder pipe 10. The steam generated by the boiler 14 drives a generator 22 to generate electricity through a steam turbine 21. The flue gas stack of the boiler 14 is in turn connected to a stack 20 via a dust separator 18 and a desulphurisation tower 19.
Preferably, the biomass powder pipeline 8 is provided with a thermometer 15 and a first pressure gauge 11, and the primary powder pipe 10 is provided with a second pressure gauge 16.
The invention provides a biomass power generation method by coupling a coal burner set, which comprises the following steps: the biomass drying method comprises the steps that original biomass stored in a biomass stock ground 1 is firstly primarily crushed through a crusher 2 and then enters a conveyor 3, an iron removal device is arranged on a conveyor belt of the conveyor to remove iron-containing substances mixed in the biomass, the biomass which is primarily crushed and deironized is conveyed into a hammer mill 4 through the conveyor 3 to be crushed and dried, a biomass drying heat source and a carrying medium are primary air conveyed through a primary air bypass pipeline 7, the air quantity of the primary air is controlled through a control valve 6, biomass powder meeting the particle size requirement (below 2 mm) is carried by the bypass primary air and is pressurized through a booster fan 5, the biomass powder is conveyed into an original primary powder pipe 10 of a coal-fired unit through a biomass powder pipeline 8 and is fully mixed with pulverized coal ground through a coal bunker 13 and a coal mill 9 and then conveyed into a boiler 14 to be combusted, and the coupling process of the biomass and coal is achieved. By monitoring the pressure difference between the pressure gauge 11 at the outlet of the booster fan 5 and the pressure gauge of the primary powder pipe at the outlet of the coal mill, the outlet pressure of the booster fan is ensured to be higher than the pressure of the primary powder pipe, so that the biomass powder can be smoothly fed into the primary powder pipe to realize effective mixing.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (9)

1. A biomass power generation system coupled with a coal burner group is characterized by comprising a crusher (2), a conveyor (3), a hammer mill (4) and a booster fan (5);
the exit linkage of crusher (2) is to the input of conveyer (3), and the output of conveyer (3) is connected to the living beings powder import of hammer mill (4), still is connected with once wind bypass pipeline (7) on hammer mill (4), and the living beings powder export of hammer mill (4) is connected to a powder pipe (10) of boiler (14) through booster fan (5) that living beings powder pipeline (8) and living beings powder pipeline (8) set up.
2. The coal burner group-coupled biomass power generation system according to claim 1, further comprising a biomass yard (1), an outlet of the biomass yard (1) being connected to an inlet of the crusher (2).
3. The coal burner group-coupled biomass power generation system as claimed in claim 1, wherein the particle size of the biomass particles processed by the hammer mill (4) is not more than 2 mm.
4. The coal burner group-coupled biomass power generation system according to claim 1, further comprising an air preheater (17) and a control valve (6), wherein primary air is supplied through the air preheater (17) and the flow rate of the primary air is regulated by the control valve (6) on the primary air bypass duct (7).
5. The coal burner group-coupled biomass power generation system according to claim 1, wherein a biomass powder pipe (8) is provided with a temperature gauge (15) and a first pressure gauge (11), and a primary powder pipe (10) is provided with a second pressure gauge (16).
6. The coal burner group-coupled biomass power generation system according to claim 1, further comprising a coal bunker (13) and a coal mill (9), wherein an outlet of the coal bunker (13) is connected to an inlet of the coal mill (9), and an outlet of the coal mill (9) is connected to the primary powder pipe (10).
7. The coal burner train-coupled biomass power generation system according to claim 1, further comprising a steam turbine (21) and a generator (22), wherein the steam generated by the boiler (14) drives the generator (22) to generate power through the steam turbine (21).
8. The coal burner group-coupled biomass power generation system according to claim 1, further comprising a dust collector (18), a desulfurization tower (19) and a chimney (20), wherein the tail gas flue of the boiler (14) is connected to the chimney (20) sequentially through the dust collector (18) and the desulfurization tower (19).
9. A method for generating power by coupling biomass with a coal burner group is characterized by comprising the following steps:
the original biomass stored in the biomass stock ground (1) is firstly primarily crushed by a crusher (2) and then enters a conveyor (3), an iron removal device is arranged on a conveyor belt of the conveyor to remove iron-containing substances mixed in biomass, the conveyor (3) sends the biomass after primary crushing and iron removal into a hammer mill (4) for crushing and drying, a biomass drying heat source and a carrying medium are primary air conveyed through a primary air bypass pipeline (7), the air quantity of the primary air is controlled by a control valve (6), the biomass powder meeting the requirement of particle size is carried by the bypass primary air and is pressurized by a booster fan (5), is sent into an original primary powder pipe (10) of a coal-fired unit through a biomass powder pipeline (8), the biomass and coal are fully mixed with pulverized coal ground by a coal bunker (13) and a coal grinder (9) and then are sent into a boiler (14) for combustion, so that the coupling process of biomass and coal is realized; by monitoring the pressure difference between the pressure gauge (11) at the outlet of the booster fan (5) and the pressure gauge of the primary powder pipe at the outlet of the coal mill, the outlet pressure of the booster fan is ensured to be higher than the pressure of the primary powder pipe, so that the biomass powder can be smoothly fed into the primary powder pipe to realize effective mixing.
CN202110444153.5A 2021-04-23 2021-04-23 Biomass power generation system and method coupled with coal burner unit Pending CN113154432A (en)

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CN202110444153.5A CN113154432A (en) 2021-04-23 2021-04-23 Biomass power generation system and method coupled with coal burner unit

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Application Number Priority Date Filing Date Title
CN202110444153.5A CN113154432A (en) 2021-04-23 2021-04-23 Biomass power generation system and method coupled with coal burner unit

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113446618A (en) * 2021-07-28 2021-09-28 西安热工研究院有限公司 Direct-fired coupling power generation system and method for conveying biomass by boiler smoke of coal-fired power station
CN113446615A (en) * 2021-07-28 2021-09-28 西安热工研究院有限公司 Biomass and coal-fired independently-operated biomass coupling power generation system of pulverized coal boiler
CN113776075A (en) * 2021-08-30 2021-12-10 西安交通大学 Walnut shell raw coal blending combustion pulverizing system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113446618A (en) * 2021-07-28 2021-09-28 西安热工研究院有限公司 Direct-fired coupling power generation system and method for conveying biomass by boiler smoke of coal-fired power station
CN113446615A (en) * 2021-07-28 2021-09-28 西安热工研究院有限公司 Biomass and coal-fired independently-operated biomass coupling power generation system of pulverized coal boiler
CN113776075A (en) * 2021-08-30 2021-12-10 西安交通大学 Walnut shell raw coal blending combustion pulverizing system

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