CN115451401A - Sorting type biomass-fired circulating fluidized bed boiler feeding system - Google Patents
Sorting type biomass-fired circulating fluidized bed boiler feeding system Download PDFInfo
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- CN115451401A CN115451401A CN202211265101.2A CN202211265101A CN115451401A CN 115451401 A CN115451401 A CN 115451401A CN 202211265101 A CN202211265101 A CN 202211265101A CN 115451401 A CN115451401 A CN 115451401A
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- fluidized bed
- circulating fluidized
- bed boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/22—Fuel feeders specially adapted for fluidised bed combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
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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
- F23J11/00—Devices for conducting smoke or fumes, e.g. flues
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention belongs to the technical field of boilers, and particularly relates to a sorting type biomass-fired circulating fluidized bed boiler feeding system. The technical scheme is as follows: a sorting type biomass-fired circulating fluidized bed boiler feeding system comprises a circulating fluidized bed boiler and a buffering bin, wherein a circulating fluidized bed boiler feeding port is connected between the circulating fluidized bed boiler and the buffering bin, a biomass feeding port is connected to the buffering bin, sorting type movable feeding equipment is installed in the buffering bin, the bottom of the sorting type movable feeding equipment is connected with a blower through a pipeline, and the upper part of the buffering bin is connected with a dust remover through a pipeline; and the top of the circulating fluidized bed boiler is connected with an induced draft fan through a pipeline. The invention provides a sorting type biomass feeding and hearth internal-pulling lower-negative-pressure feeding system of a circulating fluidized bed boiler.
Description
Technical Field
The invention belongs to the technical field of boilers, and particularly relates to a sorting type biomass-fired circulating fluidized bed boiler feeding system.
Background
The biomass energy is widely concerned by people because of the advantages of environmental friendliness, renewability, large inventory, capability of replacing conventional fossil fuels and the like. The circulating fluidized bed boiler technology has the advantages of wide coal type adaptability, high combustion efficiency, low pollutant discharge and the like. And with the increasing pressure of energy conservation and emission reduction in the global scope, the development of biomass-fired circulating fluidized bed boilers becomes a technical route for efficiently utilizing clean energy.
Although various circulating fluidized bed boilers and biomass feeding systems for burning biomass fuels are designed and put into production by different manufacturers at present, a series of problems of low boiler bed temperature, large positive pressure at a feeding port, low combustion efficiency and the like are caused due to overhigh ash concentration in the circulating fluidized bed boiler because of high soil content of domestic biomass, and the problems of reverse flow of smoke at the feeding port, ignition of a stock bin, blockage of feeding equipment and the like during boiler feeding are solved by adopting methods of boiler ash discharge, large negative pressure (more than-2000 Pa) of hearth drawing and the like.
Aiming at a biomass boiler for combustion, different units propose different patents which aim to realize smooth conveying of biomass fuel so as to solve the problems of positive pressure of a hearth, reverse fleeing of smoke gas or blockage and the like which possibly exist in biomass feeding, for example, a patent with the publication number of CN210619077U proposes that the problems of feeding, reverse fleeing of smoke gas and the like are realized by arranging a biomass bin, an activator, a kick-out device, a discharging belt conveyor, a screw feeder and a series of devices, and the like, and the patent has the defects of complex system, easy blockage of fuel, incapability of realizing continuous feeding after the reverse fleeing of smoke gas and the like; patent publication No. CN210014350U proposes feeding through an injection device to prevent positive pressure in the furnace, and although the idea of the injection device has certain novelty, how to realize smooth feeding on a fluidized bed boiler is not considered, and the injection device has certain limitations, and the problem that the efficiency of the boiler is reduced due to too large soil content is not considered; the patent with publication number CN208886819U proposes to divide a biomass bin into different areas, and to realize feeding stability by controlling feeding rates of the different bins, and it does not consider that backpressure at a feeding position may have great influence on safety and stability of a feeding system, and also does not consider the problem caused by high soil content of biomass; patent publication No. CN109852428A provides a method for delivering biomass fuel to a positive pressure gasification furnace, but it has a complex system, and does not consider the problems of the complex and high soil content of circulating fluidized bed boiler fuel; although the patent with publication number CN212402697U can realize positive pressure continuous feeding, the system is complex, the mechanical structure is many, once mechanical failure occurs during operation, it is difficult to ensure stable operation of the boiler, and the influence of the soil content on the boiler is not considered; patent publication No. CN209431449U expects to achieve tempering of positive pressure in the furnace by means of seal air on a screw feeder, etc., which has proved to be impossible in the existing biomass boiler because if the feeding screw is close to the air side, the seal air cannot enter the furnace chamber, but rather aggravates the reverse channeling of positive pressure in the boiler; patent publication No. CN108179031A provides an adjustable positive pressure biomass feeding system, which mainly utilizes a rotary blade to generate a pressure head to realize positive pressure feeding, is complex in system, can realize feeding to biomass fuel by a plurality of previous processes, and does not consider the influence of high soil content of biomass on a boiler.
The above-mentioned a plurality of patents or the system is too complicated, and it is comparatively difficult to implement, or does not consider the characteristic of actual living beings, and is too idealized, or is difficult to overcome the malleation in the fluidized bed boiler to above-mentioned patent does not consider to solve the domestic living beings soil content height and leads to the big, the combustion efficiency subalternation problem of malleation in the stove through feed technology.
Aiming at the problem of high soil content of biomass fuel, the invention adopts a sorting type biomass feeding system process, can reduce the ash content of biomass fed into a boiler from the source, and can realize the purposes of no back-flow of flue gas at a feeding port of a boiler hearth, high boiler combustion efficiency and the like in a mode of pulling a lower negative pressure in the hearth, thereby greatly improving the economy, stability and safety of the biomass circulating fluidized bed boiler for burning.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a sorting type biomass feeding and hearth internal-pulling circulating fluidized bed boiler feeding system with lower negative pressure.
The technical scheme adopted by the invention is as follows:
a sorting type biomass-fired circulating fluidized bed boiler feeding system comprises a circulating fluidized bed boiler and a buffering bin, wherein a circulating fluidized bed boiler feeding port is connected between the circulating fluidized bed boiler and the buffering bin, a biomass feeding port is connected to the buffering bin, sorting type movable feeding equipment is installed in the buffering bin, the bottom of the sorting type movable feeding equipment is connected with a blower through a pipeline, and the upper part of the buffering bin is connected with a dust remover through a pipeline; and the top of the circulating fluidized bed boiler is connected with an induced draft fan through a pipeline.
The biomass fuel enters the buffer bin from the biomass feed inlet, the air sent by the air feeder enters the sorting type movable feeding equipment, and the biomass fuel is uniformly distributed on the sorting type movable feeding equipment through the buffer bin under the action of upward air flow coming out of the sorting type movable feeding equipment. The dust in the biomass fuel is carried to the upper part of the buffer bin by the ascending air flow to form dust-containing air flow, and the dust-containing air flow enters the dust remover. The biomass fuel after dust removal is sent to a feeding port of the circulating fluidized bed boiler from the forward moving sorting type movable feeding equipment to enter a hearth for combustion. After the dust in the biomass is removed, the ash concentration in the circulating fluidized bed boiler is greatly reduced. At the moment, the hearth of the circulating fluidized bed boiler is pumped to lower negative pressure through the induced draft fan, so that the negative pressure at the feed inlet of the circulating fluidized bed boiler can be pumped to about 0Pa, and zero-pressure feeding at the feed inlet is realized.
The invention reduces the soil content in the biomass fuel by a sorting technology, ensures the pressure at the feed port of the circulating fluidized bed boiler to be at a zero pressure point while improving the combustion efficiency of the biomass-fired circulating fluidized bed boiler by reducing the negative pressure at the feed port of the hearth, finally avoids the smoke gas of a feeding system from flowing backwards due to the positive pressure in the circulating fluidized bed boiler, and greatly improves the economy and the safety of the circulating fluidized bed boiler.
As a preferable scheme of the invention, a material homogenizing device is arranged in the biomass feed inlet. The homogenizing device can disperse the biomass fuel, and the biomass fuel is uniformly dispersed on the sorting type movable feeding equipment through the buffer bin under the combined action of the homogenizing device and the upward air flow coming out of the sorting type movable feeding equipment. Under the condition that the biomass fuel is uniformly dispersed, the dust in the biomass fuel can be more fully carried to the upper part of the buffer bin by the ascending air flow to form dust-containing air flow.
In a preferred embodiment of the present invention, a valve is connected to a pipe between the blower and the sorting type mobile feeding device. When the soil content of the biomass fuel is not high, a valve on an air pipe between the air feeder and the sorting type movable feeding equipment is closed, and then a small negative pressure is pumped by the induced draft fan, so that the pressure at the feeding port of the circulating fluidized bed boiler can be pumped to be near a zero pressure point.
As a preferable aspect of the present invention, the blower is further connected to the circulating fluidized bed through a pipe. When the blower is a primary blower, a secondary blower or a high-pressure fluidized blower for the circulating fluidized bed boiler, the blower is also required to supply air into the circulating fluidized bed boiler.
As a preferred scheme of the invention, the top of the dust remover is connected with the induced draft fan through a pipeline, and a valve is arranged on the pipeline between the dust remover and the induced draft fan. The dust remover directly uses the draught fan of connecting circulating fluidized bed boiler to take out gas, and the current fan system that send of circulating fluidized bed boiler realizes biomass fuel's pretreatment, very big reduction operation and transformation cost rationally utilize. When the soil content of the biomass fuel is not high, a valve on a pipeline between the dust remover and the induced draft fan needs to be closed.
As the preferable scheme of the invention, the bottom of the dust remover is provided with a dust collecting hopper. The dust settled in the dust remover can be collected in the dust collecting hopper, so that the dust can be collected conveniently.
As a preferable scheme of the invention, a plurality of distribution pipes are arranged at the bottom of the sorting type movable feeding equipment, and a main pipe between the air feeder and the sorting type movable feeding equipment is connected with the plurality of distribution pipes. The distribution pipes can uniformly deliver airflow to all areas at the bottom of the sorting type movable feeding equipment, so that the biomass fuel is more uniformly distributed.
In a preferred embodiment of the present invention, the blower is a single blower or a primary blower of a circulating fluidized bed boiler, a secondary blower of a circulating fluidized bed boiler, or a high-pressure fluidized bed blower of a circulating fluidized bed boiler.
In a preferred embodiment of the present invention, the sorting type movable feeding device is a movable grate or a movable chain plate machine. The separation of the biomass fuel is realized while the separation feeding is realized by supplying air to the lower part of the separation type movable feeding equipment.
As a preferable scheme of the invention, the dust remover is a gravity settling dust remover or a cyclone dust remover.
The invention has the beneficial effects that:
the invention reduces the soil content in the biomass fuel by a sorting technology, ensures the pressure at the feed port of the circulating fluidized bed boiler to be at a zero pressure point while improving the combustion efficiency of the biomass-fired circulating fluidized bed boiler by a method of reducing the negative pressure at the feed port of the hearth, finally avoids the smoke back-flowing of a feeding system caused by the positive pressure in the circulating fluidized bed boiler, and greatly improves the economy and the safety of the circulating fluidized bed boiler.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1-biomass feed inlet; 2-a buffer bin; 3-a material homogenizing device; 4-sorting type mobile feeding equipment; 5-a feeding port of the circulating fluidized bed boiler; 6-circulating fluidized bed boiler; 7-a blower; 8-a dust remover; 9-ash collecting hopper; and 10-a draught fan.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1, the sorting type biomass-fired circulating fluidized bed boiler feeding system of the embodiment comprises a circulating fluidized bed boiler 6 and a buffering bin 2, wherein a circulating fluidized bed boiler feeding port 5 is connected between the circulating fluidized bed boiler and the buffering bin 2, a biomass feeding port 1 is connected to the buffering bin 2, sorting type movable feeding equipment 4 is installed in the buffering bin 2, the bottom of the sorting type movable feeding equipment 4 is connected with a blower 7 through a pipeline, the upper part of the buffering bin 2 is connected with a dust remover 8 through a pipeline, and the bottom of the dust remover 8 is provided with a dust collecting hopper 9; the top of the circulating fluidized bed boiler 6 is connected with an induced draft fan 10 through a pipeline; and a material homogenizing device 3 is arranged in the biomass feed inlet 1.
When the soil content of biomass is high, the negative pressure of the hearth outlet of the circulating fluidized bed boiler 6 is controlled to prevent the feed inlet 5 of the circulating fluidized bed boiler from being close to a zero pressure point, the biomass fuel enters the buffer bin 2 from the biomass feed inlet 1 through the material homogenizing device 3, meanwhile, air sent out by the air feeder 7 enters the sorting type movable feeding equipment 4, and the biomass fuel is uniformly distributed on the sorting type movable feeding equipment 4 through the buffer bin 2 under the combined action of the material homogenizing device 3 and upward air flow from the sorting type movable feeding equipment 4; the top of the dust remover 8 is connected with an induced draft fan 10 through a pipeline.
The dust in the biomass fuel is carried to the upper part of the buffer bin 2 by the ascending air flow to form dust-containing air flow, the dust-containing air flow enters the dust remover 8, the dust remover 8 catches the dust in the air flow and enters the dust collecting hopper, and the air flow after dust removal is pumped away by the induced draft fan 10. The biomass fuel after removing dust is sent into the circulating fluidized bed boiler feed inlet 5 by the sorting type movable feeding equipment 4 which moves forward to enter the hearth for combustion, because the dust in the biomass is removed, the ash concentration in the circulating fluidized bed boiler 6 is greatly reduced, the hearth of the circulating fluidized bed boiler 6 is pumped to lower negative pressure (lower than-1000 Pa) by the induced draft fan 10, the negative pressure at the feed inlet 5 of the circulating fluidized bed boiler can be pumped to about 0Pa, and the zero-pressure feeding of the feed inlet is realized.
And a valve is connected to a pipeline between the blower 7 and the sorting type movable feeding equipment 4, and a valve is arranged on a pipeline between the dust remover 8 and the induced draft fan 10. When the soil content of the biomass is not high, a valve on an air pipe between the air feeder 7 and the sorting type movable feeding equipment 4 is closed, a valve on a pipeline between the dust remover 8 and the induced draft fan 10 is closed, then the induced draft fan 10 pumps small negative pressure (lower than-1000 Pa) to pump the pressure at the feeding port 5 of the circulating fluidized bed boiler to be near a zero pressure point, then the biomass enters the buffer bin 2 through the biomass feeding port 1 through the material homogenizing device 3 and is uniformly distributed on the sorting type movable feeding equipment 4, and the sorting type movable feeding equipment 4 is controlled to convey the biomass from the feeding port 5 of the circulating fluidized bed boiler to the circulating fluidized bed boiler 6 for combustion.
Furthermore, the blower 7 is also connected with the circulating fluidized bed through a pipeline; the blower 7 can be a single blower or a primary blower, a secondary blower or a high-pressure fluidized blower for the circulating fluidized bed boiler 6, and is used for providing cold air with a certain pressure head to be sent into the sorting type mobile feeding equipment 4 for sorting the biomass fuel. When the blower 7 is a primary blower, a secondary blower or a high-pressure fluidizing blower for the circulating fluidized bed boiler 6, the blower 7 also supplies air into the circulating fluidized bed boiler 6.
Furthermore, a plurality of distribution pipes are arranged at the bottom of the sorting type movable feeding equipment 4, and a main pipe between the air blower 7 and the sorting type movable feeding equipment 4 is connected with the plurality of distribution pipes. The distribution pipes can evenly deliver the air flow to various areas at the bottom of the sorting mobile feeder apparatus 4, which facilitates more even distribution of the biomass fuel.
The sorting type movable feeding device 4 can be a movable grate or a movable chain plate machine, and the sorting type movable feeding device has the function of realizing sorting of biomass fuel while moving feeding through lower air supply.
The dust separator 8 may be a gravity settling type dust separator 8, a cyclone type dust separator 8, or the like, and is mainly used for collecting dust in a dust-containing airflow after biomass separation.
The induced draft fan 10 is mainly used for realizing that the feeding port 5 of the circulating fluidized bed boiler is near a zero pressure point under the condition that the outlet of the circulating fluidized bed boiler 6 is pumped with small negative pressure (within (-1000 Pa)), and can ensure that the pressure at the feeding port at the upper part of the biomass buffer bin 2 is negative pressure.
The outlet of the dust remover 8 can be connected to any position in front of the induced draft fan 10 of the flue gas system of the circulating fluidized bed boiler 6.
According to the invention, the soil content in the biomass fuel is reduced through a sorting technology, and the method of reducing the negative pressure of the feeding port of the hearth is adopted, so that the combustion efficiency of the biomass-fired circulating fluidized bed boiler 6 is improved, the pressure at the feeding port 5 of the circulating fluidized bed boiler is ensured to be at a zero pressure point, the reverse channeling of the flue gas of a feeding system caused by the positive pressure in the circulating fluidized bed boiler 6 is finally avoided, and the economy and the safety of the circulating fluidized bed boiler 6 are greatly improved.
The system process is based on relevant theoretical research, biomass fuel and dust are separated through a pneumatic separation technology, and the biomass fuel and the dust are fed into a circulating fluidized bed boiler feeding port 5 with the pressure near a zero pressure point after the negative pressure of a hearth is controlled, and then the biomass fuel and the dust enter a circulating fluidized bed boiler 6 for stable combustion. The feeding system is simple in process structure and simple and convenient in control method, zero pressure at the feeding port 5 of the circulating fluidized bed boiler can be realized, the influence on the safety of the feeding system caused by positive pressure reverse channeling of the circulating fluidized bed boiler 6 is avoided, the soil content in biomass fuel is reduced, the operating temperature level in the boiler is improved, the heat loss caused by ash discharge is reduced, and the economical and safe operation of the circulating fluidized bed boiler 6 is finally realized.
The dust remover 8 directly uses the induced draft fan 10 connected with the circulating fluidized bed boiler 6 to pump gas, reasonably utilizes the existing induced draft fan 10 feeding system of the circulating fluidized bed boiler 6, realizes the pretreatment of biomass fuel, and greatly reduces the operation and modification cost.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (10)
1. The utility model provides a sorting type is fired with living beings circulating fluidized bed boiler feed system which characterized in that: the device comprises a circulating fluidized bed boiler (6) and a buffering bin (2), wherein a circulating fluidized bed boiler feed inlet (5) is connected between the circulating fluidized bed boiler and the buffering bin (2), a biomass feed inlet (1) is connected to the buffering bin (2), sorting type movable feeding equipment (4) is installed in the buffering bin (2), the bottom of the sorting type movable feeding equipment (4) is connected with a blower (7) through a pipeline, and the upper part of the buffering bin (2) is connected with a dust remover (8) through a pipeline; the top of the circulating fluidized bed boiler (6) is connected with an induced draft fan (10) through a pipeline.
2. The sorting biomass-fired circulating fluidized bed boiler feed system of claim 1, wherein: and a material homogenizing device (3) is arranged in the biomass feed inlet (1).
3. The sorting biomass-fired circulating fluidized bed boiler feed system of claim 1, wherein: and a valve is connected on a pipeline between the air feeder (7) and the sorting type movable feeding equipment (4).
4. The sorting biomass-fired circulating fluidized bed boiler feed system of claim 1, wherein: the blower (7) is also connected with the circulating fluidized bed through a pipeline.
5. The sorting biomass-fired circulating fluidized bed boiler feed system of claim 1, wherein: the top of the dust remover (8) is connected with an induced draft fan (10) through a pipeline.
6. The sorted biomass-fired circulating fluidized bed boiler feed system of claim 1, wherein: and a dust collecting hopper (9) is arranged at the bottom of the dust remover (8).
7. The sorting biomass-fired circulating fluidized bed boiler feed system of claim 1, wherein: the bottom of the sorting type movable feeding equipment (4) is provided with a plurality of distribution pipes, and a main pipe between the air feeder (7) and the sorting type movable feeding equipment (4) is connected with the distribution pipes.
8. The sorted biomass-fired circulating fluidized bed boiler feed system of claim 1, wherein: the air blower (7) is an independent fan or a primary fan of the circulating fluidized bed boiler (6), a secondary fan of the circulating fluidized bed boiler (6) or a high-pressure fluidized fan of the circulating fluidized bed boiler (6).
9. The sorting biomass-fired circulating fluidized bed boiler feed system of claim 1, wherein: the sorting type movable feeding equipment (4) is a movable grate or a movable chain plate machine.
10. The sorting biomass-fired circulating fluidized bed boiler feed system of claim 1, wherein: the dust remover (8) is a gravity settling dust remover (8) or a cyclone dust remover (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211265101.2A CN115451401A (en) | 2022-10-17 | 2022-10-17 | Sorting type biomass-fired circulating fluidized bed boiler feeding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211265101.2A CN115451401A (en) | 2022-10-17 | 2022-10-17 | Sorting type biomass-fired circulating fluidized bed boiler feeding system |
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| Publication Number | Publication Date |
|---|---|
| CN115451401A true CN115451401A (en) | 2022-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211265101.2A Pending CN115451401A (en) | 2022-10-17 | 2022-10-17 | Sorting type biomass-fired circulating fluidized bed boiler feeding system |
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| Country | Link |
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| CN (1) | CN115451401A (en) |
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2022
- 2022-10-17 CN CN202211265101.2A patent/CN115451401A/en active Pending
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