CN113137623A - Biomass blending combustion system and method - Google Patents
Biomass blending combustion system and method Download PDFInfo
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- CN113137623A CN113137623A CN202110567930.5A CN202110567930A CN113137623A CN 113137623 A CN113137623 A CN 113137623A CN 202110567930 A CN202110567930 A CN 202110567930A CN 113137623 A CN113137623 A CN 113137623A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
- F23K1/04—Heating fuel prior to delivery to combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a biomass blending combustion system and a method, wherein a discharge port of drying equipment is connected with a feed port of a crusher, a discharge port of the crusher is connected with an inlet of a gas-material separator, a gas outlet of the gas-material separator is connected with an inlet of dust removal equipment, a material outlet of the gas-material separator is connected with an inlet of conveying equipment, an outlet of the conveying equipment is connected with an inlet of a storage bin, a straw burner is arranged on a power plant boiler, an outlet of the storage bin is connected with the power plant boiler, an air outlet of a powder feeding device is connected with the storage bin, the drying equipment is communicated with a tail flue of the power plant boiler through a pipeline, an inlet of a furnace smoke fan is connected with the drying equipment, the dust removal equipment is arranged at the tail flue, and an outlet of the furnace smoke fan is connected with an inlet of the dust removal equipment and/or an outlet of the crusher. The biomass straw can be used for boiler combustion power generation or heat supply, and can realize energy conservation and emission reduction and expand the application of the biomass straw.
Description
Technical Field
The invention belongs to the technical field of coal-fired coupled biomass power generation technical improvement engineering, and relates to a biomass co-combustion system and a biomass co-combustion method.
Background
Biomass energy is renewable energy with huge reserves and wide distribution, most biomass straws are directly burned and returned to the field at present, huge energy waste and environmental pollution are caused, and how to effectively utilize straw resources becomes a general concern. If various biomass resources, particularly crop straws, can be used for boiler combustion power generation or heat supply, not only can the implementation of energy-saving and emission-reduction policies be promoted, but also a new channel for increasing the income of farmers can be provided by forming a branch agricultural industry chain.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a biomass co-combustion system and a biomass co-combustion method.
The technical scheme adopted by the invention is as follows:
a biomass blending combustion system, which comprises a drying device, a crusher, a gas-material separator, a conveying device and a storage bin, send whitewashed device, the straw combustor, the power plant boiler, dust collecting equipment and stove cigarette fan, drying equipment's discharge gate and breaker feed inlet are connected, the import connection of breaker discharge gate and gas material separator, the gas outlet and the dust collecting equipment entry linkage of gas material separator, the material export and the conveying equipment entry linkage of gas material separator, the export and the entry linkage of feed bin of conveying equipment, the straw combustor sets up on the power plant boiler, the export and the power plant boiler of feed bin are connected, send whitewashed device's air outlet and feed bin connection, drying equipment passes through the pipeline and communicates with the afterbody flue of power plant boiler, the entry and the drying equipment of stove cigarette fan are connected, dust collecting equipment sets up in afterbody flue department, the export and the dust collecting equipment entry and/or the breaker exit linkage of stove cigarette fan.
Preferably, the biomass blending combustion system further comprises rough machining equipment, wherein the rough machining equipment comprises a feeding machine, a conveyor and a cutting machine, an outlet of the feeding machine is connected with an inlet of the conveyor, an outlet of the conveyor is connected with an inlet of the cutting machine, and an outlet of the cutting machine is connected with an inlet of the drying equipment.
Preferably, the feeding machine is a double-roller double-screw feeding machine, the conveyor is a corrugated flange belt conveyor, and the cutting machine is a rotary cutter.
Preferably, the gas-material separator adopts a cyclone separator, a material outlet of the cyclone separator is provided with a receiving hopper, the conveying equipment adopts a conveying screw, a feeding end of the conveying screw is arranged at the receiving hopper, and a discharging end of the conveying screw is positioned at the storage bin.
Preferably, the straw burner is arranged at the position of a secondary air nozzle below the uppermost burner of the power plant boiler.
Preferably, the dust removing equipment adopts an electric dust remover.
Preferably, the powder feeding device adopts a powder feeding fan or a primary fan of a power plant boiler.
The invention also provides a biomass co-combustion method, which is carried out by adopting the biomass co-combustion system, and comprises the following processes:
drying the biomass in drying equipment, wherein in the drying process, a flue gas in a tail flue is pumped into the drying equipment by a flue gas blower, and the flue gas is contacted with the biomass to dry the biomass;
crushing the biomass dried by the drying equipment by using a crusher;
the flue gas in the drying equipment is sent to the outlet of a dust removal device and/or a crusher by the furnace flue gas fan, wherein the dust removal device removes dust from the flue gas conveyed by the furnace flue gas fan and the flue gas in the tail flue, and the crusher conveys the crushed biomass to a gas-material separator by utilizing the flue gas conveyed by the furnace flue gas fan;
the gas-material separator is used for separating flue gas and broken biomass, the biomass obtained by separation is conveyed to a storage bin through conveying equipment, and the flue gas obtained by separation is conveyed to dust removal equipment for dust removal;
the powder feeding device feeds the biomass in the storage bin into the straw combustor by using gas;
the straw combustor sends the biomass into a hearth of a power plant boiler for combustion.
Preferably, the moisture content of the biomass dried by the drying equipment is not more than 15%, the particle size of the biomass crushed by the crusher is not more than 10mm, the biomass in the bin is sent to the straw burner by the powder feeding device through flue gas, the flow rate of the flue gas is 30-40 m/s, the mass ratio of the flue gas to the biomass is controlled to be more than 2, and the biomass is sent to a hearth of a power plant boiler by the straw burner to be burnt. Preferably, the method also comprises a rough processing process of the biomass, the grain diameter of the rough processed biomass is 8-15mm, the temperature of the flue gas input into the drying equipment by the furnace smoke blower is not lower than 300 ℃, and the temperature of the flue gas obtained after the drying equipment is dried is not lower than 120 ℃.
The invention has the following beneficial effects:
the biomass blending combustion system can realize the drying of biomass by using the drying equipment, and meets the combustion requirement of a power plant boiler; the drying equipment is communicated with a tail flue of the power plant boiler through a pipeline, and an inlet of the flue gas blower is connected with the drying equipment, so that flue gas with higher temperature in the tail flue of the power plant boiler can be sucked into the drying equipment by using the flue gas blower, the flue gas is contacted with biomass, the biomass is dried, meanwhile, the flue gas with lower temperature after heat exchange in the drying equipment can be conveyed to the dust removal equipment by using the flue gas blower, and the dust removal equipment is used for removing dust from the part of the flue gas, so that dust pollution is prevented; the export of stove cigarette fan and breaker exit linkage can make the tiny living beings that the breaker breakage obtained carry for gas material separator, and this transport mode is comparatively convenient, need not to use extra conveying equipment, practices thrift the cost, owing to use the flue gas to carry broken living beings, utilizes gas material separator to separate the gas mixture of living beings and flue gas, need not additionally to use energy to be used for the separation, can also be with comparatively tiny living beings along with the flue gas simultaneouslyThe biomass is discharged and finally captured by dust removal equipment, so that adverse effects of fine biomass on boiler combustion are prevented, and dust pollution is also prevented; in conclusion, the biomass blending combustion system can effectively utilize biomass, utilizes the biomass of the power plant boiler to burn, is used for power generation or heat supply, and has better economic, ecological and social benefits. CO discharged in the process of biomass recycling2With CO absorbed during biomass regeneration2Reach carbon balance with CO2The zero emission effect has potential contribution value for relieving and finally solving the greenhouse effect.
Further, through setting up rough machining equipment and can be cut great living beings into less living beings, the drying of the drying equipment of being convenient for improves drying efficiency, has reduced the processing degree of difficulty of breaker simultaneously.
Furthermore, the straw burner is arranged at the position of the secondary air nozzle below the uppermost burner of the power plant boiler, the arrangement mode does not influence the arrangement and the operation of the main burner, and the poor-quality coal for the boiler cannot bring no load due to the occupation of the nozzle. The straw burner is arranged on the upper part of the burner area, so that the original low-nitrogen combustion is not influenced, and the generation amount of NOx is favorably reduced.
Drawings
FIG. 1 is a block diagram of a biomass blending combustion system according to the present invention.
Wherein, 1 is a biomass stock ground, 2 is a double-roller double-screw feeder, 3 is a corrugated flange belt conveyor, 4 is a rotary cutter, 5 is drying equipment, 6 is a furnace smoke fan, 7 is an electric dust remover, 8 is a tail flue, 9 is a power plant boiler, 10 is a cyclone separator, 11 is a crusher, 12 is conveying equipment and 13 is a storage bin.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the biomass blending combustion system of the invention comprises a drying device 5, a crusher 11, a gas-material separator, a conveying device, a storage bin, a powder feeding device, a straw burner, a power plant boiler 9, a dust removing device and a flue gas blower 6, wherein a discharge port of the drying device 5 is connected with a feed inlet of the crusher 11, a discharge port of the crusher 11 is connected with an inlet of the gas-material separator, a gas outlet of the gas-material separator is connected with an inlet of the dust removing device, a material outlet of the gas-material separator is connected with an inlet of the conveying device, an outlet of the conveying device is connected with an inlet of the storage bin, the straw burner is arranged on the power plant boiler 9, an outlet of the storage bin is connected with the power plant boiler 9, an air outlet of the powder feeding device is connected with the storage bin, the drying device 5 is communicated with a tail flue 8 of the power plant boiler 9 through a pipeline, an inlet of the flue gas blower 6 is connected with the drying device 5, the dust removing device is arranged at the tail 8, the outlet of the fume fan 6 is connected to the inlet of the dust removal device and/or the outlet of the crusher 11.
As a preferred embodiment of the invention, the biomass blending combustion system further comprises rough machining equipment, wherein the rough machining equipment comprises a feeding machine, a conveyor and a cutting machine, an outlet of the feeding machine is connected with an inlet of the conveyor, an outlet of the conveyor is connected with an inlet of the cutting machine, and an outlet of the cutting machine is connected with an inlet of the drying equipment 5.
As a preferred embodiment of the invention, the feeding machine adopts a double-roller double-helix feeding machine, the conveyer adopts a corrugated flange belt conveyer, and the cutting machine adopts a rotary cutter.
As a preferred embodiment of the present invention, the gas-material separator adopts a cyclone separator, a material outlet of the cyclone separator is provided with a receiving hopper, the conveying device adopts a conveying screw, a feeding end of the conveying screw is arranged at the receiving hopper, a discharging end of the conveying screw is arranged at the storage bin, the conveying screw is used for conveying biomass in the receiving hopper to the feeding bin, and the biomass in the storage bin enters the boiler for combustion.
As a preferred embodiment of the present invention, the straw burner is positioned at the position of the overfire air nozzle below the uppermost burner of the power plant boiler 9. The straw combustor is arranged at the upper part of the combustor area, so that biomass fuel can be fed in the upper part of the combustor area, smoke generated by combustion has a recycling effect, and the generation of pulverized coal combustion pollutants can be reduced.
As a preferred embodiment of the invention, the dust removing equipment adopts an electric dust remover.
As a preferred embodiment of the invention, the powder feeding device adopts a powder feeding fan or a primary fan of a power plant boiler.
The invention also provides a biomass co-combustion method, which is carried out by adopting the biomass co-combustion system, and comprises the following processes:
drying the biomass in a drying device 5, wherein in the drying process, a flue gas of a tail flue 8 is pumped into the drying device 5 by a flue gas blower 6, and the flue gas is contacted with the biomass to dry the biomass;
the crusher 11 crushes the biomass dried by the drying device 5;
the flue gas in the drying equipment 5 is sent to the outlet of a dust removal device and/or a crusher 11 by the furnace flue gas fan 6, wherein the dust removal device removes dust from the flue gas conveyed by the furnace flue gas fan 6 and the flue gas in the tail flue 8, and the crusher 11 conveys the crushed biomass to a gas-material separator by using the flue gas conveyed by the furnace flue gas fan 6;
the gas-material separator is used for separating flue gas and broken biomass, the biomass obtained by separation is conveyed to a storage bin through conveying equipment, and the flue gas obtained by separation is conveyed to dust removal equipment for dust removal;
the powder feeding device feeds the biomass in the storage bin into the straw combustor by using gas;
the straw burner sends the biomass into a hearth of a power plant boiler 9 for combustion.
As a preferred embodiment of the invention, the moisture content of the biomass dried by the drying equipment 5 is not more than 15%, the particle size of the biomass crushed by the crusher 11 is not more than 10mm, the biomass in the storage bin is fed into the straw combustor by the powder feeding device by using flue gas, the flow rate of the flue gas is 30-40 m/s, the mass ratio of the flue gas to the biomass is controlled to be more than 2, and the biomass is fed into a hearth of a power plant boiler 9 by the straw combustor for combustion. The straw material is conveyed at the smoke temperature, the phenomenon that hot air is conveyed in a pipeline to be ignited and burnt in advance is avoided, the treated biomass is easier to burn than pulverized coal, the flow speed of smoke is 30-40 m/s, the mass ratio of the smoke to the biomass is controlled to be more than 2, a large amount of biomass can be sufficiently burnt, and more efficient utilization is achieved.
As a preferred embodiment of the invention, the method also comprises a rough processing process of the biomass, the grain diameter of the rough processed biomass is 8-15mm, the temperature of the flue gas input into the drying equipment 5 by the furnace smoke blower 6 is not lower than 300 ℃, and the temperature of the flue gas obtained after the drying equipment 5 is dried is not lower than 120 ℃.
Examples
The biomass blending combustion system comprises a double-roller double-screw feeder 2, a corrugated flange belt conveyor 3, a rotary cutter 4, a furnace smoke pipeline, a furnace smoke fan 6, a drying device 5, a cyclone separator 10, a crusher 11, a conveying screw and bucket elevator 12, a power station boiler 9, a tail flue 8 and an electric dust remover 7. The outlet of the double-roller double-screw feeder 2 corresponds to the inlet of a corrugated flange belt conveyor 3, the outlet of the corrugated flange belt conveyor 3 corresponds to the inlet of a rotary cutter 4, the drying equipment adopts a dryer, the outlet of the rotary cutter 4 corresponds to the inlet of the drying equipment 5, the discharge port of the drying equipment 5 corresponds to the feed inlet of a crusher 11, the discharge port of the crusher 11 corresponds to the inlet of a cyclone separator 10, the gas outlet of the cyclone separator 10 is connected with the inlet of an electric dust remover 7, the material outlet of the cyclone separator 10 is connected with the inlet of a conveying screw and a bucket elevator 12, the outlet of the conveying screw and the bucket elevator 12 is connected with the inlet of a storage bin 13, a straw burner is arranged at the position of a secondary air nozzle below the uppermost burner of a power plant boiler 9, the outlet of the storage bin 13 is connected with the straw burner, a powder feeding device adopts a powder feeding fan, the air outlet of the powder feeding fan is connected with the storage bin 13, drying equipment 5 is through stove tobacco pipe and power plant boiler 9's afterbody flue 8 intercommunication, and the entry and the drying equipment 5 of stove cigarette fan 6 are connected, and electrostatic precipitator 7 sets up in afterbody flue 8 department, and the export of stove cigarette fan 6 and electrostatic precipitator 7 entry and 11 exit linkage of breaker.
When the biomass blending combustion system works, straws and other biomass are put into a plant and then are firstly stacked in a straw stock ground 1, the biomass enters a rotary cutter 4 through a double-roller double-screw feeder 2 and a corrugated flange belt conveyor 3 to finish rough machining, large materials obtained by rough machining enter a drying device 5, the large materials are dried by smoke gas of more than 300 ℃ pumped from the tail part of a boiler by a smoke fan 6 in the drying device, the temperature of the dried smoke gas is not lower than 120 ℃, and then the smoke gas is sent into an inlet of an electric dust remover 7 by the smoke fan 6 and is conveyed to a cyclone separator 10; the dried straw material is directly sent into a crusher 11 by the furnace smoke, crushed to be less than 2mm in diameter, and after the material and the furnace smoke are separated by a cyclone separator 10, the material is temporarily stored in a storage bin 13 by a conveying screw and a bucket elevator 12;
the materials in the bin 13 are conveyed to the upper part of a hearth of a boiler 9 by powder conveying air from a powder conveying fan to participate in combustion, then tail gas enters an electric dust remover 7 through a tail flue 8 and is finally discharged to the atmosphere, and ash and slag enter a hopper bin of the electric dust remover.
In the embodiment, during feeding, straws are manually pushed into the double-helix double-roller feeding machine 2 through machinery, and are conveyed to the rotary cutter 4 through the corrugated flange belt conveyor 3, and the straws need to be transferred for several times due to the change of the trend of the conveying belt. The straws are crushed into crushed materials with the particle size of 8-15mm by a rotary cutter, and preparation is made for further crushing the straws. The freshly harvested straws are generally high in moisture content and not suitable for direct crushing or combustion, so that the straws need to be dried by drying equipment, hot flue gas, hot air or steam can be used for drying, the hot flue gas obtained by a power plant is easy, and the hot flue gas is not contacted with the straws, so that the problem of combustion is solved, the hot flue gas is selected to dry the straws to the moisture content of below 15%, and the drying equipment for non-contact heat transfer is selected as much as possible in the equipment model selection. The straws are dried and then enter a crusher to be crushed to the particle size of below 2 mm. The straws are burnt in the common pulverized coal furnace, the straws do not need to be crushed too thin, and can be sent into the furnace for burning by a fan when being crushed to be below 8-10mm according to the material conveying requirement.
After the crushed straws are separated from the materials by a cyclone separator, ultrafine dust is sent into an inlet of an electric dust collector by tail gas; the materials separated by the cyclone separator are conveyed to a storage bin in front of the furnace through a powder conveying screw and a bucket elevator. The storage bin is not too large so as to ensure that the straws can still be normally mixed and burnt when the crushing or powder conveying link fails, so that the boiler has buffer time for changing the operation mode. The powder feeding can adopt cold primary air, and if the primary air fan is insufficient in output, the powder feeding fan can be independently arranged.
According to the design characteristics of the boiler burner, the secondary air nozzle below the uppermost layer burner is selected at the straw feeding position. During the period of blending and burning the straws, the nozzle is used for conveying the straws into a furnace, and the original secondary air door can be properly closed and used as peripheral air of the straw nozzle; during the period of stopping using the straws, the nozzle is used as a common secondary air nozzle, and the straw combustor occupies a certain space, so that the area of the nozzle is greatly reduced. The arrangement mode does not affect the arrangement and the operation of the main burner, and does not bring no load due to the occupation of the nozzle when the boiler burns the inferior coal. The straw burner is arranged on the upper part of the burner area, so that the original low-nitrogen combustion is not influenced, and the generation amount of NOx is favorably reduced.
The biomass blending combustion system is a simple and efficient biomass blending combustion system, is simple, can flexibly and efficiently realize biomass blending combustion, properly utilizes biomass energy, and can be used for treating CO2The method has great effect on emission reduction and has the characteristics of environment-friendliness, high efficiency and economy and large-scale utilization. The straw is a good clean renewable energy source, is one of the most potential new energy sources, and has good economic, ecological and social benefits. CO discharged in the process of biomass recycling2With CO absorbed during biomass regeneration2Reach carbon balance with CO2The zero emission effect has potential contribution value for relieving and finally solving the greenhouse effect. The biomass co-combustion power generation can provide more electric power, makes the commercialization of biomass resources possible, and has important significance for accelerating rural construction and social stability in China.
(1) The demand of the power plant on the biomass fuel can form an industrial chain which takes purchasing, processing, transportation, equipment production and maintenance as main contents, can well solve the employment problem of farmers, increase the income of the farmers and is beneficial to promoting the local economic development and social stability.
(2) The biomass fuel meets the energy development requirement, can effectively make up for the shortage of fossil fuels, reduces the emission of traditional pollutants, greenhouse gases and the like, effectively protects the ecological environment and promotes the formation of the biomass fuel market.
(3) Provides a scientific way for the efficient utilization of biomass. In many rural areas of China, 30-40% of biomass straws are used for cooking, and the heat energy utilization rate is only 5-8%; the thermoelectric conversion efficiency of the biomass direct-fired power plant is more than 30%, the energy utilization level of a large-capacity thermal power generating unit is low, the manufacturing cost is high, and the economical efficiency is poor; the invention can reduce the consumption of fossil fuel by blending and burning the biomass, and the energy resource allocation is more reasonable.
Claims (10)
1. A biomass blending combustion system is characterized by comprising a drying device (5), a crusher (11), a gas-material separator, a conveying device, a storage bin, a powder feeding device, a straw burner, a power plant boiler (9), a dust removing device and a furnace smoke fan (6), wherein a discharge port of the drying device (5) is connected with a feed port of the crusher (11), a discharge port of the crusher (11) is connected with an inlet of the gas-material separator, a gas outlet of the gas-material separator is connected with an inlet of the dust removing device, a material outlet of the gas-material separator is connected with an inlet of the conveying device, an outlet of the conveying device is connected with an inlet of the storage bin, the straw burner is arranged on the power plant boiler (9), an outlet of the storage bin is connected with the power plant boiler (9), an air outlet of the powder feeding device is connected with the storage bin, the drying device (5) is communicated with a tail flue (8) of the power plant boiler (9) through a pipeline, the inlet of the furnace smoke fan (6) is connected with the drying device (5), the dust removing device is arranged at the tail flue (8), and the outlet of the furnace smoke fan (6) is connected with the inlet of the dust removing device and/or the outlet of the crusher (11).
2. The biomass blending combustion system according to claim 1, further comprising a rough machining device, wherein the rough machining device comprises a feeding machine, a conveyor and a cutting machine, an outlet of the feeding machine is connected with an inlet of the conveyor, an outlet of the conveyor is connected with an inlet of the cutting machine, and an outlet of the cutting machine is connected with an inlet of the drying device (5).
3. The biomass blending combustion system according to claim 2, wherein the feeding machine is a double-roller double-screw feeding machine, the conveyor is a corrugated rib belt conveyor, and the cutting machine is a rotary cutter.
4. The biomass blending combustion system according to claim 1, wherein the gas-material separator is a cyclone separator, the material outlet of the cyclone separator is provided with a receiving hopper, the conveying device is a conveying screw, the feeding end of the conveying screw is arranged at the receiving hopper, and the discharging end of the conveying screw is arranged at the storage bin.
5. The biomass co-combustion system as claimed in claim 1, wherein the straw burner is disposed at the position of the secondary air nozzle below the uppermost burner of the power plant boiler (9).
6. The biomass co-combustion system as claimed in claim 1, wherein the dust removing equipment is an electric dust remover.
7. The biomass co-combustion system as claimed in claim 1, wherein the powder feeding device is a powder feeding fan or a primary fan of a power plant boiler.
8. A biomass co-combustion method is characterized in that the biomass co-combustion method is carried out by adopting the biomass co-combustion system of any one of claims 1 to 7, and comprises the following steps:
drying the biomass in a drying device (5), wherein in the drying process, a flue gas of a tail flue (8) is pumped into the drying device (5) by a flue gas blower (6), and the flue gas is contacted with the biomass to dry the biomass;
the crusher (11) crushes the biomass dried by the drying equipment (5);
the flue gas in the drying equipment (5) is sent to an outlet of a dust removal device and/or a crusher (11) by the furnace flue gas fan (6), wherein the dust removal device removes dust from the flue gas sent by the furnace flue gas fan (6) and the flue gas in the tail flue (8), and the crusher (11) sends the crushed biomass to a gas-material separator by using the flue gas sent by the furnace flue gas fan (6);
the gas-material separator is used for separating flue gas and broken biomass, the biomass obtained by separation is conveyed to a storage bin through conveying equipment, and the flue gas obtained by separation is conveyed to dust removal equipment for dust removal;
the powder feeding device feeds the biomass in the storage bin into the straw combustor by using gas;
the straw combustor sends the biomass into a hearth of a power plant boiler (9) for combustion.
9. The biomass co-combustion method according to claim 8, characterized in that the moisture content of the biomass dried by the drying equipment (5) is not more than 15%, the particle size of the biomass crushed by the crusher (11) is not more than 10mm, the biomass in the storage bin is fed into the straw burner by the powder feeding device through flue gas, the flow rate of the flue gas is 30-40 m/s, the mass ratio of the flue gas to the biomass is controlled to be more than 2, and the biomass is fed into the hearth of the power plant boiler (9) by the straw burner to be combusted.
10. The biomass co-combustion method according to claim 8, further comprising a biomass rough processing process, wherein the grain size of the roughly processed biomass is 8-15mm, the temperature of flue gas input into the drying equipment (5) by the furnace flue gas blower (6) is not lower than 300 ℃, and the temperature of flue gas obtained after drying by the drying equipment (5) is not lower than 120 ℃.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113685837A (en) * | 2021-08-24 | 2021-11-23 | 西安西热锅炉环保工程有限公司 | Multi-medium dry biomass direct coupling power generation system and method |
| CN113685806A (en) * | 2021-08-19 | 2021-11-23 | 东方电气集团东方锅炉股份有限公司 | Biomass blending combustion system based on coal-fired boiler |
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2021
- 2021-05-24 CN CN202110567930.5A patent/CN113137623A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113685806A (en) * | 2021-08-19 | 2021-11-23 | 东方电气集团东方锅炉股份有限公司 | Biomass blending combustion system based on coal-fired boiler |
| CN113685806B (en) * | 2021-08-19 | 2023-08-01 | 东方电气集团东方锅炉股份有限公司 | Biomass blending combustion system based on coal-fired boiler |
| CN113685837A (en) * | 2021-08-24 | 2021-11-23 | 西安西热锅炉环保工程有限公司 | Multi-medium dry biomass direct coupling power generation system and method |
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