CN117028981A - Multi-fuel controllable blending device and method for circulating fluidized bed boiler - Google Patents
Multi-fuel controllable blending device and method for circulating fluidized bed boiler Download PDFInfo
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- CN117028981A CN117028981A CN202311075091.0A CN202311075091A CN117028981A CN 117028981 A CN117028981 A CN 117028981A CN 202311075091 A CN202311075091 A CN 202311075091A CN 117028981 A CN117028981 A CN 117028981A
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- 239000000446 fuel Substances 0.000 title claims abstract description 204
- 238000002156 mixing Methods 0.000 title claims abstract description 159
- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000005303 weighing Methods 0.000 claims abstract description 69
- 239000000463 material Substances 0.000 claims abstract description 38
- 239000003245 coal Substances 0.000 claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 238000003860 storage Methods 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 23
- 238000002485 combustion reaction Methods 0.000 claims description 20
- 238000004590 computer program Methods 0.000 claims description 7
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 description 14
- 230000006870 function Effects 0.000 description 9
- 238000004891 communication Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 239000004449 solid propellant Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000010344 co-firing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000000802 evaporation-induced self-assembly Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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
- F23C10/002—Fluidised bed combustion apparatus for pulverulent solid fuel
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention relates to the technical field of circulating fluidized bed boilers, in particular to a circulating fluidized bed boiler multi-fuel controllable blending device and a method, wherein the device mainly comprises the following components: the first preset bin and the second preset bin are used for storing and dropping a preset amount of raw fuel and blended fuel according to a target blending proportion; the first preset weighing belt and the second preset weighing belt are used for receiving and transmitting a preset amount of raw fuel according to a preset first operating frequency and transmitting blended fuel according to a preset second operating frequency; a conveyor belt for receiving and primarily blending the two fuels according to a preset third operating frequency to obtain an initial blended fuel; a mixing chamber to receive and fully blend the initial blending fuel to obtain a final blending fuel of a target blending ratio; and the material output belt is used for conveying the final blended fuel to the original coal conveying system and then to the hearth of the circulating fluidized bed boiler. The device realizes lower cost, is suitable for mixing various different fuels and raw coal, and can control the mixing amount.
Description
Technical Field
The invention relates to the technical field of circulating fluidized bed boilers, in particular to a device and a method suitable for controllable blending of multiple fuels in a circulating fluidized bed boiler.
Background
The Circulating Fluidized Bed (CFB) boiler fuel has the advantages of wide adaptability, strong combustion stability and low pollutant discharge, and has thorough incineration disposal, low operation cost and simple and mature technology when being used as a technical means for blending and incinerating inferior fuels such as coal slime, coal gangue, biomass and the like and combustible pollutants such as industrial solid waste, sludge and the like. Meanwhile, the mixed combustion of the multi-element inferior fuel in the circulating fluidized bed boiler not only realizes harmless and recycling treatment of harmful substances in the inferior fuel, but also can reduce the power generation cost of the coal-fired power plant, can enable thermal power enterprises to obtain the treatment subsidy of the inferior fuel, increases the online electric quantity and improves the enterprise benefit.
The fuel blending method suitable for the CFB boiler in the related art mainly utilizes the original coal conveying system, comprising a coal crusher and a coal screening machine, and adds a blending fuel bin, wherein the blended fuel directly falls into a coal conveying belt and enters the furnace for combustion along with the raw fuel; the high-water-content water-like fuel generally needs to be additionally provided with drying equipment, and the dried fuel is added into the original coal conveying system. However, the method is only aimed at a single blended fuel, and after the blended fuel is replaced, the method is not necessarily applicable to new fuels; the drying equipment is additionally arranged in the technology because of high water content of part of the mud-shaped blended fuel, or agglomeration and caking are easy to occur under the condition of uneven blending, so that an original coal conveying system is blocked, the operation failure is caused, the production is influenced, the engineering cost and the operation cost of the drying equipment are high, and especially in small-scale blending, the economical efficiency is greatly reduced; with the help of the existing circulating fluidized bed boiler coal conveying system, as the system is provided with a multi-stage intermediate transfer station, coarse crushing, fine crushing, multi-stage screening equipment and other intermediate treatment equipment, the property of blended fuel is different, so that the faults of all stages of equipment in transportation are easy to cause; in order to adapt to the properties of blended fuel, the original system is usually modified, such as thermal drying equipment and the like, so that the purchase cost is high, the overall modification cost is high, the system occupies a large area, the system equipment is complex, the system equipment cannot be moved usually, the geographic position is limited, and the economic loss is large if the type of the blended fuel is required to be replaced only for a single blended fuel after the system is built; part of technologies cannot continuously monitor fuel quality in the process of blending different fuels, and the control method is rough, so that the combustion effect in the final furnace is affected.
That is, the related art has the following problems in the co-firing process: 1) The types and properties of the blended fuels are different, and a blending method with strong adaptability is not available temporarily; 2) Part of the mud-like blended fuel is easy to agglomerate and agglomerate under the condition of uneven blending due to high water content, so that an original coal conveying system is blocked, operation faults are caused, and production is influenced; 3) The fuel quality cannot be continuously monitored in the process of mixing different fuels according to the mass ratio, and the control method is rough and affects the combustion effect in the final furnace; 4) Most of the blending burning needs to reform the conveying system, and the engineering cost and the operation cost are high.
Thus, there is a need for a method for controlled blending of multiple fuels in a circulating fluidized bed boiler.
Disclosure of Invention
The invention provides a device and a method for controllably blending multiple fuels of a circulating fluidized bed boiler, which are used for solving the problems that the prior art realizes the blending scheme of the fuel of the boiler, the construction and operation costs are greatly increased, the geographical environment is limited, the blending proportion is uncontrollable and the accuracy is low.
An embodiment of the first aspect of the present invention provides a circulating fluidized bed boiler multi-fuel controllable blending device, including: the device comprises a first preset bin and a second preset bin, wherein flow controllers are arranged at the outlets of the first preset bin and the second preset bin to store raw fuel and blended fuel respectively, and the flow controllers are adjusted according to a target blending proportion so as to drop a first preset amount of raw fuel and a second preset amount of blended fuel; the first preset weighing belt is arranged below the first preset bin to receive and transmit the first preset amount of raw fuel according to a preset first operating frequency; the second preset weighing belt is arranged below the second preset bin to receive and transmit the second preset amount of blended fuel according to a preset second operating frequency; the conveying belt is arranged below the first preset weighing belt and the second preset weighing belt, so that the first preset amount of raw fuel and the second preset amount of blended fuel are received and primarily blended according to a preset third operating frequency, and initial blended fuel is obtained; the mixing chamber is arranged below the running direction end of the conveying belt, so as to receive and fully blend the initial blending fuel according to a preset stirring speed, and obtain the final blending fuel with the target blending proportion; the material output belt, one end of the material output belt is connected with the mixing chamber, and the other end of the material output belt is connected with the original coal conveying system so as to convey the final blended fuel to the original coal conveying system, and the final blended fuel is conveyed into a hearth of the circulating fluidized bed boiler for combustion according to a preset original actual furnace feeding flow; the controller is respectively connected with the flow controller, the first preset weighing belt, the second preset weighing belt, the conveying belt and the mixing chamber, so that the flow controller is adjusted according to the target mixing proportion, the first preset bin drops the first preset amount of raw fuel, the second preset bin drops the second preset amount of mixed fuel, and the preset first operating frequency, the preset second operating frequency, the preset third operating frequency and the preset stirring speed are determined, so that the first preset amount of raw fuel and the second preset amount of mixed fuel are fully mixed, and the final mixed fuel is obtained.
Optionally, the first preset weighing belt and the second preset weighing belt are both variable-frequency control belts.
Optionally, the running directions of the first preset weighing belt and the second preset weighing belt are consistent, and the running directions of the conveying belt and the first preset weighing belt and the second preset weighing belt are opposite.
Optionally, a stirring device and a belt are arranged in the mixing chamber, wherein the stirring device adopts a form of a central motion shaft and wedge-shaped blades, and the blades are arranged in a crossing way so as to fully blend the initial blending fuel through the rotation of the blades; the belt is arranged on the bottom of the mixing chamber and connected with one end of the material output belt so as to convey the fully blended fuel to the material output belt.
Optionally, the method further comprises: the storage tank is connected with the material output belt, so that the fully blended fuel is conveyed into the storage tank under the condition that the in-situ actual condition does not need direct-access furnace combustion.
An embodiment of the second aspect of the present invention provides a method for controllably blending a multi-component fuel for a circulating fluidized bed boiler, comprising the steps of: controlling a flow controller according to a preset blending proportion, so that a first preset bin drops a first preset amount of raw fuel to a first preset weighing belt, and a second preset bin drops a second preset amount of blended fuel to a second preset weighing belt; adjusting the running frequency of the first preset weighing belt and the second preset weighing belt to enable the raw fuel with the first preset amount and the blended fuel with the second preset amount to fall onto a conveying belt in sequence, and completing preliminary blending on the conveying belt; the initially blended fuel after the initial blending is sent into a mixing chamber by utilizing the conveying belt to be fully stirred; and the fully blended fuel is sent to an original coal conveying system through the material output belt and is sent to a hearth of the circulating fluidized bed boiler for combustion according to a preset original actual furnace feeding flow.
Optionally, a stirring device and a belt are arranged in the mixing chamber, wherein the stirring device adopts a form of a central motion shaft and wedge-shaped blades, and the blades are arranged in a crossing way so as to fully blend the initial blending fuel through the rotation of the blades; the belt is arranged on the bottom of the mixing chamber and connected with one end of the material output belt so as to convey the fully blended fuel to the material output belt.
Optionally, the fully blended fuel is conveyed to the storage tank by the material output belt under the condition that the direct-access furnace is not required to burn in the field practical situation.
An embodiment of a third aspect of the present invention provides an electronic device, including: the system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the program to realize the multi-fuel controllable blending method of the circulating fluidized bed boiler.
An embodiment of a fourth aspect of the present invention provides a computer readable storage medium storing a computer program which when executed by a processor implements a circulating fluidized bed boiler multi-fuel controllable blending method as above.
The device and the method for controllably blending the multi-element fuel of the circulating fluidized bed boiler are suitable for blending various different types of fuels and raw coal; the construction and operation cost is lower when the method is applied, the method can be used for the mixing process of the fuel fed into the CFB boiler, the operation is simple and convenient, and the normal operation of the original conveying system is not influenced; the application is not limited by geographical environment, the occupied area of the equipment is small, and the position of the equipment can be moved according to actual needs; the blending quantity of different fuels can be accurately controlled in the blending process, the blending proportion is determined, and specific data of the blending quantity of different types of fuels in the whole equipment operation process can be continuously monitored through a display screen of a control system; in addition, the development of the incineration treatment technology of low-calorific-value fuel and harmful solid waste can be promoted, and the aims of protecting the ecological environment and improving the economy are achieved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a multi-fuel controllable blending device for a circulating fluidized bed boiler according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for controlled blending of multiple fuels for a circulating fluidized bed boiler in accordance with an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Reference numerals illustrate:
the multi-fuel controllable blending device of the 100-circulating fluidized bed boiler comprises a 1-first preset bin, a 2-second preset bin, a 3-first preset weighing belt, a 4-second preset weighing belt, a 5-conveying belt, a 6-mixing chamber, a 7-controller, an 8-material output belt, a 9-raw coal conveying system and a hearth of the 10-circulating fluidized bed boiler.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Fig. 1 is a schematic structural diagram of a multi-fuel controllable blending device of a circulating fluidized bed boiler according to an embodiment of the present invention.
As shown in fig. 1, the circulating fluidized bed boiler multi-fuel controllable blending apparatus 100 includes: a first preset bin 1, a second preset bin 2, a first preset weighing belt 3, a second preset weighing belt 4, a conveying belt 5, a mixing chamber 6, a controller 7 and a material output belt 8.
The outlets of the first preset storage bin 1 and the second preset storage bin 2 are respectively provided with a flow controller so as to store raw fuel and blended fuel respectively, and the flow controllers are adjusted according to a target blending proportion so as to drop the raw fuel with the first preset quantity and the blended fuel with the second preset quantity.
Specifically, the first preset bin 1 and the second preset bin 2 are respectively used for storing raw fuel and blended fuel, a flow controller with a flow control function is arranged at the outlet of the bin, the purpose of blanking rate control is achieved, and the function can be directly regulated and controlled through the controller 7.
Further, a first preset weighing belt 3 is arranged below the first preset bin 1 to receive and transmit a first preset amount of raw fuel according to a preset first operating frequency; a second preset weighing belt 4 is arranged below the second preset bin 2 to receive and deliver a second preset amount of blended fuel according to a preset second operating frequency.
Further, in one embodiment of the present invention, the first preset weighing belt and the second preset weighing belt are both variable frequency control belts.
Further, in one embodiment of the present invention, the traveling directions of the first and second pre-set weighing belts are identical, and the traveling directions of the transporting belt and the first and second pre-set weighing belts are opposite.
Specifically, the first preset weighing belt 3 corresponds to the raw fuel falling below the first preset storage bin 1, the second preset weighing belt 4 corresponds to the blended fuel falling below the second preset storage bin 2, the running directions of the first preset weighing belt 3 and the second preset weighing belt 4 are consistent, the front and rear falling on the conveying belt 5 is ensured, the first preset weighing belt and the second preset weighing belt are variable-frequency control belts, the controller 7 can be used for adjusting the preset first running frequency of the first preset weighing belt 3 and the preset second running frequency of the second preset weighing belt 4, and the blending amount is changed, so that the blending proportion is adjusted.
Further, the conveyor belt 5 is disposed below the first preset weighing belt 3 and the second preset weighing belt 4, so as to receive and primarily blend the first preset amount of raw fuel and the second preset amount of blended fuel according to the preset third operating frequency, thereby obtaining an initial blended fuel.
Specifically, the conveying belt 5 is a fuel conveying belt in the system, two different fuels fall into the conveying belt 5 from the first preset weighing belt 3 and the second preset weighing belt 4 in sequence, preliminary blending is completed on the conveying belt 5, initial blending fuel is obtained, the conveying belt 5 sends the initial blending fuel into the mixing chamber 6, and the controller 7 can determine a preset third operating frequency of the conveying belt 5 so that the two different fuels can complete preliminary blending.
Further, a mixing chamber 6 is provided below the running direction end of the conveyor belt 5 to receive and sufficiently blend the initial blending fuel according to a preset stirring speed to obtain a final blending fuel of a target blending ratio.
Further, in one embodiment of the present invention, a stirring device and a belt are provided in the mixing chamber 6, wherein the stirring device takes the form of a center motion shaft plus wedge-shaped blades, and the blades are disposed crosswise to fully blend the initially blended fuel by the rotation of the blades; the belt is disposed on the bottom of the mixing chamber 6 and is connected to one end of the material delivery belt 8 to deliver the blended fuel after sufficient blending to the material delivery belt.
Specifically, after the fuel falls into the mixing chamber 6, the fuel passes through a stirring device in the mixing chamber 6 during falling, the stirring device can adopt a mode of adding wedge-shaped blades on a central motion shaft, the blades are arranged in a crossed mode, two fuels are fully mixed through blade rotation, the final fuel falls onto a belt at the bottom of the mixing chamber and is then conveyed onto a material output belt, and at the moment, the output materials are fully mixed fuel according to a certain proportion, so that the final mixed fuel with a target mixing proportion is obtained.
It should be noted that the design of the mixing chamber 6 in the embodiment of the present invention includes, but is not limited to, conventional spiral stirring, various stirring components may be used, and belts, spiral feeding or other methods may be used for output.
The controller 7 is respectively connected with the flow controller, the first preset weighing belt 3, the second preset weighing belt 4, the conveying belt 5 and the mixing chamber 6, so that the flow controller is adjusted according to the target mixing proportion, the first preset storage bin 1 drops a first preset amount of raw fuel, the second preset storage bin 2 drops a second preset amount of mixed fuel, and the preset first operating frequency, the preset second operating frequency, the preset third operating frequency and the preset stirring speed are determined, so that the first preset amount of raw fuel and the second preset amount of mixed fuel are fully mixed, and the final mixed fuel is obtained.
Specifically, the controller 7 is a control center of the whole blending device, the running frequency of the first preset weighing belt 3, the second preset weighing belt 4, the running frequency of the conveying belt 5, the stirring rate of the mixing chamber 6 and the like in the device are directly regulated and controlled by the controller 7 according to the target blending proportion, and the controller 7 has a data display function and can intuitively monitor the running condition of each component. In addition, the controller 7 corresponds to all automatic operation setting systems in the whole blending apparatus, and needs to be able to realize functions of controlling the frequency of each belt, starting and stopping of components, displaying and recording data, and the like.
One end of a material output belt 8 is connected with the mixing chamber 6, and the other end of the material output belt is connected with the original coal conveying system 9 so as to convey the final blended fuel to the original coal conveying system 9 and convey the final blended fuel into a hearth 10 of the circulating fluidized bed boiler for combustion according to a preset original actual furnace feeding flow.
Further, in one embodiment of the present invention, the method further includes: the storage tank is connected with the material output belt 8 so as to convey fully blended fuel into the storage tank under the condition that the on-site actual condition does not need direct-access furnace combustion.
Specifically, the purpose of the material output belt 8 is to convey the blended final blended fuel in the blending device to the raw coal conveying system 9, and if the blending device does not require direct furnace combustion according to the actual situation on site, the blended fuel can also be conveyed to a storage tank or the like.
The working principle of the multi-fuel controllable blending device of the circulating fluidized bed boiler is as follows: the raw fuel and the blended fuel are respectively stored in a first preset feed bin 1 and a second preset feed bin 2, a controller 7 controls a flow controller according to a target blending proportion, the two fuels respectively fall onto a first preset weighing belt 3 and a second preset weighing belt 4, the first preset weighing belt 3 and the second preset weighing belt 4 are adjusted through the controller 7 so as to achieve the purpose of controlling the blending proportion, the two fuels fall onto a conveying belt 5 along with the first preset weighing belt 3 and the second preset weighing belt 4 in sequence, preliminary blending is carried out, the initial blended fuel enters a mixing chamber 6, the final blended fuel is obtained by mixing in the mixing chamber 6, the mixed fuel is sent to an original coal conveying system 9 through a material output belt 8, and the blended fuel is sent to a hearth 10 of a circulating fluidized bed boiler for combustion according to the charging flow of the original coal conveying system 9.
In summary, the multi-fuel controllable blending device for the circulating fluidized bed boiler provided by the embodiment of the invention has the following beneficial effects:
(1) Low cost: the construction and operation cost is lower during application, the original system is not required to be modified excessively, the normal operation of the original conveying system is not influenced, the method can be used for the blending process of the fuel fed into the furnace of the CFB boiler, the operation is simple and convenient, and the blended fuel can be directly conveyed to storage points such as a coal yard when not used; the application occasions are not limited to CFB boilers, and similar combustion equipment can be used when fuel blending is needed;
(2) Pluripotency: the method is suitable for mixing various different types of fuels and raw coal, and the mixing system is not affected when different types of solid fuels need to be replaced later; besides the application of blending firing, different kinds of solid materials used for other purposes can be mixed by using the scheme;
(3) Convenience: the device is not limited by geographical environment when in use, the occupied area of the device is small, and meanwhile, the position of the device can be moved according to actual needs;
(4) The method can be used for metering: the blending quantity of different fuels can be accurately controlled in the blending process, the blending proportion is determined, and specific data of the blending quantity of different types of fuels in the whole equipment operation process can be continuously monitored through a display screen of a control system;
(5) In addition, the development of the incineration treatment technology of low-calorific-value fuel and harmful solid waste can be promoted, and the aims of protecting the ecological environment and improving the economy are achieved.
Next, a method for controllably blending a circulating fluidized bed boiler multi-fuel according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 2 is a schematic flow chart of a method for controllably blending multiple fuels in a circulating fluidized bed boiler according to an embodiment of the present invention.
As shown in fig. 2, the method for controllably blending the multi-component fuel of the circulating fluidized bed boiler comprises the following steps:
in step S201, the flow controller is controlled according to the preset blending ratio, so that the first preset bin drops a first preset amount of raw fuel to the first preset weighing belt, and the second preset bin drops a second preset amount of blended fuel to the second preset weighing belt.
In step S202, the operation frequencies of the first preset weighing belt and the second preset weighing belt are adjusted to drop the first preset amount of raw fuel and the second preset amount of blended fuel onto the conveyor belt successively, and the preliminary blending is completed on the conveyor belt.
In step S203, the initially blended fuel after the initial blending is fed into the mixing chamber by the conveyor belt to be sufficiently stirred.
Further, in one embodiment of the invention, a mixing chamber is provided with a stirring device and a belt, wherein,
the stirring device adopts a mode of adding wedge-shaped blades on a central motion shaft, and the blades are arranged in a crossed manner so as to fully blend the initial blending fuel through the rotation of the blades;
the belt is arranged on the bottom of the mixing chamber and connected with one end of the material output belt so as to convey the fully blended fuel to the material output belt.
In step S204, the fully blended fuel is sent to the original coal conveying system through the material output belt, and is sent to the hearth of the circulating fluidized bed boiler for combustion according to the preset original actual feeding flow.
Further, in one embodiment of the invention, the fully blended fuel is delivered to the storage tank by the material delivery belt without the need for direct-in-furnace combustion in field practice.
It should be noted that the foregoing explanation of the embodiment of the apparatus for controllably blending a circulating fluidized bed boiler multi-component fuel is also applicable to the method for controllably blending a circulating fluidized bed boiler multi-component fuel in this embodiment, and will not be repeated here.
The multi-fuel controllable blending method for the circulating fluidized bed boiler provided by the embodiment of the invention has the following beneficial effects:
(1) Low cost: the construction and operation cost is lower during application, the original system is not required to be modified excessively, the normal operation of the original conveying system is not influenced, the method can be used for the blending process of the fuel fed into the furnace of the CFB boiler, the operation is simple and convenient, and the blended fuel can be directly conveyed to storage points such as a coal yard when not used; the application occasions are not limited to CFB boilers, and similar combustion equipment can be used when fuel blending is needed;
(2) Pluripotency: the method is suitable for mixing various different types of fuels and raw coal, and the mixing system is not affected when different types of solid fuels need to be replaced later; besides the application of blending firing, different kinds of solid materials used for other purposes can be mixed by using the scheme;
(3) Convenience: the device is not limited by geographical environment when in use, the occupied area of the device is small, and meanwhile, the position of the device can be moved according to actual needs;
(4) The method can be used for metering: the blending amount of different fuels can be accurately controlled in the blending process, the blending proportion is determined, and specific data of the blending amount of different types of fuels in the whole equipment operation process can be continuously monitored through a display screen of a control system.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. The electronic device may include:
memory 301, processor 302, and a computer program stored on memory 301 and executable on processor 302.
The processor 302 implements the circulating fluidized bed boiler multi-fuel controllable blending method provided in the above embodiment when executing a program.
Further, the electronic device further includes:
a communication interface 303 for communication between the memory 301 and the processor 302.
A memory 301 for storing a computer program executable on the processor 302.
The memory 301 may comprise a high-speed RAM memory or may further comprise a non-volatile memory (non-volatile memory), such as at least one disk memory.
If the memory 301, the processor 302, and the communication interface 303 are implemented independently, the communication interface 303, the memory 301, and the processor 302 may be connected to each other through a bus and perform communication with each other. The bus may be an industry standard architecture (Industry Standard Architecture, abbreviated ISA) bus, an external device interconnect (Peripheral Component, abbreviated PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, abbreviated EISA) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 3, but not only one bus or one type of bus.
Alternatively, in a specific implementation, if the memory 301, the processor 302, and the communication interface 303 are integrated on a chip, the memory 301, the processor 302, and the communication interface 303 may communicate with each other through internal interfaces.
The processor 302 may be a central processing unit (Central Processing Unit, abbreviated as CPU) or an application specific integrated circuit (Application Specific Integrated Circuit, abbreviated as ASIC) or one or more integrated circuits configured to implement embodiments of the present invention.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when being executed by a processor, implements the above method for controllably blending a circulating fluidized bed boiler multi-fuel.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "N" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or N wires, a portable computer cartridge (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. A circulating fluidized bed boiler multi-fuel controllable blending device, comprising:
the device comprises a first preset bin and a second preset bin, wherein flow controllers are arranged at the outlets of the first preset bin and the second preset bin to store raw fuel and blended fuel respectively, and the flow controllers are adjusted according to a target blending proportion so as to drop a first preset amount of raw fuel and a second preset amount of blended fuel;
the first preset weighing belt is arranged below the first preset bin to receive and transmit the first preset amount of raw fuel according to a preset first operating frequency;
the second preset weighing belt is arranged below the second preset bin to receive and transmit the second preset amount of blended fuel according to a preset second operating frequency;
the conveying belt is arranged below the first preset weighing belt and the second preset weighing belt, so that the first preset amount of raw fuel and the second preset amount of blended fuel are received and primarily blended according to a preset third operating frequency, and initial blended fuel is obtained;
the mixing chamber is arranged below the running direction end of the conveying belt, so as to receive and fully blend the initial blending fuel according to a preset stirring speed, and obtain the final blending fuel with the target blending proportion;
the material output belt, one end of the material output belt is connected with the mixing chamber, and the other end of the material output belt is connected with the original coal conveying system so as to convey the final blended fuel to the original coal conveying system, and the final blended fuel is conveyed into a hearth of the circulating fluidized bed boiler for combustion according to a preset original actual furnace feeding flow;
the controller is respectively connected with the flow controller, the first preset weighing belt, the second preset weighing belt, the conveying belt and the mixing chamber, so that the flow controller is adjusted according to the target mixing proportion, the first preset bin drops the first preset amount of raw fuel, the second preset bin drops the second preset amount of mixed fuel, and the preset first operating frequency, the preset second operating frequency, the preset third operating frequency and the preset stirring speed are determined, so that the first preset amount of raw fuel and the second preset amount of mixed fuel are fully mixed, and the final mixed fuel is obtained.
2. The apparatus of claim 1, wherein the first and second predetermined weighing belts are variable frequency control belts.
3. The circulating fluidized bed boiler multi-fuel controllable blending device of claim 1, wherein the first preset weighing belt and the second preset weighing belt have a same running direction, and the transport belt is opposite to the first preset weighing belt and the second preset weighing belt.
4. The apparatus of claim 1, wherein the mixing chamber is provided with a stirring device and a belt, wherein,
the stirring device adopts a mode of adding wedge-shaped blades on a central motion shaft, and the blades are arranged in a crossing way so as to fully blend the initial blending fuel through the rotation of the blades;
the belt is arranged on the bottom of the mixing chamber and connected with one end of the material output belt so as to convey the fully blended fuel to the material output belt.
5. The circulating fluidized bed boiler multi-fuel controllable blending device of claim 1, further comprising:
the storage tank is connected with the material output belt, so that the fully blended fuel is conveyed into the storage tank under the condition that the in-situ actual condition does not need direct-access furnace combustion.
6. A method for the controlled blending of a circulating fluidized bed boiler multi-fuel, characterized in that the method for the controlled blending of a circulating fluidized bed boiler multi-fuel according to any one of claims 1 to 5 is adopted, comprising the following steps:
controlling a flow controller according to a preset blending proportion, so that a first preset bin drops a first preset amount of raw fuel to a first preset weighing belt, and a second preset bin drops a second preset amount of blended fuel to a second preset weighing belt;
adjusting the running frequency of the first preset weighing belt and the second preset weighing belt to enable the raw fuel with the first preset amount and the blended fuel with the second preset amount to fall onto a conveying belt in sequence, and completing preliminary blending on the conveying belt;
the initially blended fuel after the initial blending is sent into a mixing chamber by utilizing the conveying belt to be fully stirred;
and the fully blended fuel is sent to an original coal conveying system through the material output belt and is sent to a hearth of the circulating fluidized bed boiler for combustion according to a preset original actual furnace feeding flow.
7. A method of controlled blending of a circulating fluidized bed boiler multi-fuel according to claim 6, wherein the mixing chamber is provided with a stirring device and a belt, wherein,
the stirring device adopts a mode of adding wedge-shaped blades on a central motion shaft, and the blades are arranged in a crossing way so as to fully blend the initial blending fuel through the rotation of the blades;
the belt is arranged on the bottom of the mixing chamber and connected with one end of the material output belt so as to convey the fully blended fuel to the material output belt.
8. The method for controlled blending of circulating fluidized bed boiler multi-fuel of claim 6, wherein the fully blended fuel is delivered to the storage tank by the material delivery belt without direct-access furnace combustion in field practice.
9. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the circulating fluidized bed boiler multi-fuel controllable blending method of any of claims 6-8.
10. A computer readable storage medium having stored thereon a computer program, the program being executable by a processor for implementing a circulating fluidized bed boiler multi-fuel controllable blending method according to any of claims 6-8.
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| CN202311075091.0A CN117028981A (en) | 2023-08-24 | 2023-08-24 | Multi-fuel controllable blending device and method for circulating fluidized bed boiler |
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| CN202311075091.0A CN117028981A (en) | 2023-08-24 | 2023-08-24 | Multi-fuel controllable blending device and method for circulating fluidized bed boiler |
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| CN (1) | CN117028981A (en) |
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- 2023-08-24 CN CN202311075091.0A patent/CN117028981A/en active Pending
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