CN118089048A - Pretreatment equipment with process heat storage and release function and boiler system - Google Patents
Pretreatment equipment with process heat storage and release function and boiler system Download PDFInfo
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- 230000008569 process Effects 0.000 title description 9
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Abstract
The present invention relates to a boiler system and a control method thereof, the boiler system comprising: a furnace including a fuel inlet; the pretreatment device is used for pretreating the fuel and comprises a fuel outlet of the generated gas-solid mixed fuel; the storage device is used for storing the solid fuel formed after the fuel is preprocessed by the preprocessing device; and a solid fuel delivery device in communication with the storage device for delivering the solid fuel to the furnace inlet via a solid fuel delivery conduit. The invention also relates to a fuel pretreatment device, a fuel pretreatment method and a preheating burner.
Description
Technical Field
Embodiments of the present invention relate to the field of combustion and power generation technologies, and more particularly, to a pretreatment device and boiler system with process heat storage and a preheating burner.
Background
Coal has long been the main source of energy in our country. In order to achieve the aim of carbon neutralization, china proposes to construct a novel power system mainly based on new energy, but renewable energy has the characteristics of intermittence and volatility, and serious challenges are brought to stable and safe operation of a power grid. The power generation installation in China takes coal electricity as a main material, the duty ratio of the power installation is flexibly adjusted to be less than 6%, and the defect of the peak regulation capacity of the existing power grid becomes a main technical bottleneck of new energy grid-connected power generation. Under the 'double carbon' target, the coal motor unit can bear the task of supporting the large-scale access of renewable energy power generation. The main force of the coal motor unit in China is a pulverized coal power station boiler, the installed capacity of the pulverized coal power station boiler reaches 9.35 hundred million kilowatts in 2021 years, and the installed capacity of the coal motor unit accounts for 85% of the capacity of the coal motor unit, so that a power grid can consume renewable energy sources to the maximum extent, and the power generation must be flexibly peaking by depending on the depth of the pulverized coal power station boiler. The peak regulation rate of the pulverized coal power station boiler is an important index for rapidly responding to the change of renewable energy sources by the power grid, and the power grid has higher and higher requirements on the peak regulation rate of the pulverized coal power station boiler along with the increase of the installed capacity and the generated energy of the renewable energy sources.
When the pulverized coal boiler carries out deep peak shaving, the temperature in the hearth is reduced along with the reduction of the load of the boiler, the combustion stability of cold pulverized coal is poor, flameout is easy to occur under low load, the combustion efficiency is low, and the pulverized coal boiler becomes a key factor for limiting the deep peak shaving of the boiler. The pulverized coal combustion is a gas-solid heterogeneous reaction, the reactivity is poor at low temperature, the combustion rate is low, and when the load of the boiler is increased under low load, if the load increasing rate is too high, a large amount of fed cold pulverized coal cannot be ignited, so that flameout and deflagration of the boiler are easily caused; meanwhile, the pulverized coal power station boiler generally adopts a direct-fired pulverizing and powder feeding system, and the variable load rate of the boiler is limited by the output of the coal mill along with the change of time, so that the load adjustment rate of the boiler is low under low load. Through deep research and development and technical attack, the deep peak regulation potential and the rapid load change capability of the pulverized coal power station boiler are fully excavated, and the method has very important strategic significance for relieving the current peak regulation pressure of China, absorbing high-proportion new energy power and promoting the low-carbon transformation of the energy structure of China.
Disclosure of Invention
The present invention has been made to solve at least one aspect of the technical problems in the prior art.
According to an aspect of an embodiment of the present invention, there is provided a boiler system comprising:
A furnace including a fuel inlet;
the pretreatment device is used for pretreating the fuel and comprises a fuel outlet of the generated gas-solid mixed fuel;
the storage device is used for storing the solid fuel formed after the fuel is preprocessed by the preprocessing device; and
And the solid fuel conveying device is communicated with the storage device and is used for conveying the solid fuel to the hearth inlet through a solid fuel conveying pipeline.
According to another aspect of the embodiments of the present invention, there is provided a control method of a boiler system, including the steps of:
pretreating fuel to be fed into a boiler furnace to generate gas-solid mixed fuel;
storing at least a portion of the solid fuel in the gas-solid fuel mixture; and
The stored solid fuel is conveyed to the hearth for combustion through a fuel inlet of the hearth through a solid fuel conveying pipeline based on the boiler load adjustment requirement or stable combustion requirement.
According to still another aspect of an embodiment of the present invention, there is provided a fuel pretreatment apparatus including:
the pretreatment device is used for pretreating the fuel and comprises a fuel outlet of the generated gas-solid mixed fuel;
the storage device is used for storing the solid fuel formed after the fuel is preprocessed by the preprocessing device; and
And the solid fuel conveying device is communicated with the storage device and is used for conveying the solid fuel through a solid fuel conveying pipeline.
According to a further aspect of an embodiment of the present invention, there is provided a fuel pretreatment method including the steps of:
pretreating fuel to generate gas-solid mixed fuel;
storing at least a portion of the solid fuel in the gas-solid fuel mixture; and
The stored solid fuel is delivered to the combustion device via a solid fuel delivery conduit based on load regulation requirements or steady burning requirements.
According to a further aspect of an embodiment of the present invention, there is provided a preheating burner comprising:
The fuel pretreatment apparatus described above; and
At least one fuel nozzle, the fuel outlet and the solid fuel delivery conduit being in communication with a corresponding fuel nozzle.
Drawings
FIG. 1 is a schematic view of a boiler system according to an exemplary embodiment of the present invention;
Fig. 2-4 are schematic diagrams of boiler systems according to various exemplary embodiments of the present invention.
The drawings are merely schematic representations of the connection relationship between the components, and do not represent the relative sizes, spatially distributed positions, etc.
Detailed Description
The following description of embodiments of the present invention with reference to fig. 1-4 is intended to illustrate the general inventive concept and should not be taken as limiting the invention.
The invention provides a preheating burner with a process heat storage and release function, which can be used for depth and rapid peak regulation of a pulverized coal boiler unit and can effectively meet the requirements of renewable energy power generation under a double-carbon target. Correspondingly, the invention also provides a boiler system which can be used for depth and rapid peak regulation of the pulverized coal boiler unit and can effectively adapt to the requirements of the double-carbon target on the absorption of renewable energy power generation.
According to an embodiment of one aspect of the present invention, as shown in fig. 1 to 4, a pulverized coal preheating burner with process heat storage is proposed, comprising a preheating burner body 1 (corresponding to a pretreatment device), a hot particle silo 3 (corresponding to a storage device), a preheating fuel pipe 2 (corresponding to a first pipe), a hot particle feeding device 4 (corresponding to a solid fuel delivery device) and a preheating fuel nozzle 5 (corresponding to a fuel inlet of a furnace. The preheating burner body 1 is connected with a preheating fuel pipeline 2, the preheating fuel pipeline 2 is connected with a hot particle warehouse 3, the bottom or the lower part of the hot particle warehouse is connected with a hot particle feeding device 4, a gas outlet at the top of the hot particle warehouse (as mentioned later, a gas-solid separation device is arranged in the warehouse) is connected with a preheating fuel nozzle, and a hot particle feeding device is connected with a preheating fuel nozzle 5.
In an alternative embodiment, the top of the hot particle storage bin is in the form of a cyclone separator (i.e. the storage device and the separation device are integrally arranged), the pulverized coal is modified by the preheating burner to be gas-solid two-phase fuel (i.e. gas-solid mixed fuel) with the temperature higher than 700 ℃, the gas-solid two-phase fuel enters the hot particle storage bin 3, high-temperature solid coke therein is separated and captured, the high-temperature solid coke is stored in the hot particle storage bin, and the coal gas is output from a gas outlet at the top of the hot particle storage bin. When the high-temperature solid coke particles in the hot particle bin are stored to a certain material level, the cyclone separation effect at the top of the hot particle bin is invalid, the high-temperature gas-solid two-phase fuel is output from the top of the hot particle bin together, and the separated high-temperature solid coke particles are stored in the hot particle bin.
To ensure the temperature of the high temperature solid coke, in an alternative embodiment, the hot particle silo is a three-layer structure of refractory material + insulation material + steel housing. When the boiler stably operates, the high-temperature coke particles are stored in the hot particle storage bin and are not used, and when the boiler needs to rapidly lift the load, on the one hand, the feeding rate of coal dust is increased, on the other hand, the high-temperature coke particles in the hot particle storage bin are rapidly added into the boiler through high-temperature hot particle feeding equipment, heat is rapidly released by combustion, the lifting load rate of the boiler is increased, and the lifting load rate of the boiler can be increased to about 5% Pe by the method.
Embodiments of the present invention are described in more detail below with reference to fig. 2-4.
One of the embodiments of the pulverized coal preheating burner with process storage heat provided by the invention is shown in fig. 1, and comprises a preheating burner body 1, a high-temperature preheating fuel pipeline 2, a hot particle storage bin 3, a high-temperature hot particle feeding device 4 and a high-temperature preheating fuel nozzle 5. Wherein: the preheating burner body 1 is connected with a high-temperature preheating fuel pipeline 2, the high-temperature preheating fuel pipeline 2 is connected with a hot particle storage bin 3, a hot particle feeding device 4 is installed at the bottom of the hot particle storage bin 3, the upper part of the hot particle storage bin 3 is connected with a high-temperature preheating fuel nozzle 5 through a high-temperature resistant pipeline, the high-temperature hot particle feeding device 4 is connected with the high-temperature preheating fuel nozzle 5 through a high-temperature resistant pipeline, and the high-temperature preheating fuel nozzle is connected with a hearth. The hot particle silo 3 may be in the form of a cyclone separator, and the preheated fuel enters the hot particle silo tangentially, and the solids and gases in the preheated fuel are separated by inertia. The preheating burner body is of a fluidized bed structure, and further of a circulating fluidized bed structure.
In the embodiment, the pulverized coal firstly enters the preheating burner body 1, and the preheating modification of the temperature in the range of 700-1100 ℃ is realized in the preheating burner body 1, so that the pulverized coal is modified into high-temperature gas-solid two-phase preheating fuel from solid. The high-temperature gas-solid two-phase preheating fuel enters a high-temperature preheating fuel pipeline 2, then enters a hot particle storage bin tangentially at the speed of 10-50 m/s, wherein high-temperature solid coke and high-temperature gas are separated under the action of inertia force, the high-temperature solid coke is trapped and stored in the hot particle storage bin, and the high-temperature gas is discharged from the top of the hot particle storage and enters a high-temperature preheating fuel nozzle. When the material level of the high-temperature solid coke in the hot particle storage bin is level with the inlet position, the gas-solid separation effect of the hot particle storage bin fails, and the high-temperature gas-solid two-phase fuel is directly discharged from the outlet at the top of the hot particle storage bin and enters the high-temperature preheating fuel nozzle 5. Therefore, when the boiler is stably operated under load, the high-temperature solid coke is stored in the hot particle bin in a normal full state, and the high-temperature preheated fuel passes through the hot particle bin and then enters the high-temperature preheated fuel nozzle. When the boiler needs to rapidly rise load, high-temperature solid coke is added into a hearth through high-temperature hot particle feeding equipment according to a certain feeding rate and a certain requirement of the rising load rate, so that the boiler rapidly burns and releases heat. The gas for transporting the high-temperature solid coke can be air or steam, and the amount of the air or steam is regulated according to the temperature of the high-temperature solid coke, so that the temperature of high-temperature solid coke particles is ensured to be between 800 and 1100 ℃ when the high-temperature solid coke enters a hearth.
The invention provides a pulverized coal preheating burner with process heat storage and energy supply, which is characterized in that on one hand, pulverized coal is modified by the preheating burner, the pulverized coal is changed into high-temperature gas/solid fuel, the reactivity of the fuel is improved, the difficult problems of easy flameout and poor burnout under low load are solved, and low-load high-efficiency stable combustion is realized; on the other hand, a part of combustible heat particles are stored through the heat particle storage bin, and when the boiler needs to rapidly lift load, the part of combustible heat particles are added into a hearth according to a certain coal feeding rate to rapidly burn and release heat according to the requirement of the lifting load rate, so that the load is rapidly lifted.
The outside of the hot particle warehouse is a steel shell, the inside of the hot particle warehouse is made of refractory heat-insulating materials, and the temperature of the combustible hot particles in the hot particle warehouse is guaranteed, and the specific requirement is that the temperature of the outside of the hot particle warehouse is not more than 70 ℃ when the temperature of the hot particles is 800-1000 ℃. The upper part of the hot particle storage bin is provided with an inertial separation device, specifically, the preheated fuel enters the hot particle storage bin tangentially at the speed of 10-50 m/s by adopting a cyclone separator, the solid and the gas in the preheated fuel are separated by inertia, the high-temperature solid coke is captured and stored in the hot particle storage bin, and the high-temperature gas is discharged from the top of the hot particle storage bin and enters a high-temperature preheated fuel nozzle. The lower part of the hot particle storage bin is of a conical structure, and high-temperature hot particle feeding equipment is arranged at the bottommost part, and is a high-temperature-resistant rotary feeder, so that the feeding amount of hot particles can be accurately controlled. The storage amount of the combustible hot particles in the hot particle storage bin is about 30-60% of the feeding amount of the preheating burner, and the storage time can ensure that the temperature of the hot particles is not lower than 700 ℃ within 12 hours. An inert gas protection device is arranged on the hot particle warehouse, and the inert gas can be N 2 and CO 2. The combustible hot particles are fed into the powder feeding pipeline through the high-temperature hot particle feeding equipment, the gas for transporting the high-temperature solid coke can be air or steam, when the air is adopted for transportation, the quantity of the air is about 10-20% of the quantity of air required by complete combustion of the transported combustible hot particles, the quantity of the air or steam is regulated according to the temperature of the high-temperature solid coke, and the temperature of the high-temperature solid coke particles when entering a hearth is ensured to be 800-1100 ℃.
In the invention, after the pulverized coal is subjected to high-temperature modification, the fuel reaction activity is improved, the combustion rate under low load is improved, and the problem of poor low-load combustion stability of the boiler is solved; by arranging the combustible hot particle storage bin, the separation, storage and transportation of the high-temperature preheated coke are realized, the high-temperature preheated coke is transported into a hearth to quickly burn and release heat when the boiler needs to quickly lift load, the bottleneck of low burning rate of cold coal dust and large inertia of the original boiler pulverizing system is broken through, and the quick load change of the boiler is realized; the preheated fuel and the combustible hot particles enter the hearth through one fuel nozzle, so that the water wall holes of the hearth can be reduced.
Variant embodiments of the invention are further illustrated below.
Another embodiment of the pulverized coal preheating burner with process heat storage provided by the present invention is shown in fig. 3, which differs from the embodiment shown in fig. 2 in that in fig. 3 the preheating fuel nozzle is divided into upper and lower nozzle openings. The two nozzles are divided into an upper nozzle and a lower nozzle, the nozzles are not mutually influenced, and the adjustment of the nozzles is more flexible.
A further embodiment of the pulverized coal preheating burner with process heat storage is provided by the invention, as shown in fig. 4, comprising a preheating burner body 1, a high temperature preheating fuel pipe 2, a hot particle silo 3, a high temperature hot particle feeding device 4 and a high temperature preheating fuel nozzle 5, wherein a hot particle silo bypass pipe 6 is arranged between the preheating burner body 1 and the combustible hot particle silo. Unlike the embodiment shown in fig. 2, the preheating burner body 1 can be directly connected to the high temperature preheating fuel nozzle 5 through the hot particle silo bypass conduit 6. High temperature resistant valves (such as mushroom valves) are arranged on the high temperature preheating fuel pipeline 2 and the hot particle warehouse bypass pipeline 6. When the boiler normally and stably operates, a valve on the high-temperature preheating fuel pipeline 2 is closed, a valve on the hot particle warehouse bypass pipeline 6 is opened, and the preheating fuel directly passes through the hot particle warehouse bypass pipeline 6 to enter the high-temperature preheating fuel nozzle 5 and then enters the hearth to burn and release heat. When the high-temperature solid coke is required to be stored, a valve on the high-temperature preheating fuel pipeline 2 is opened, a valve on the hot particle warehouse bypass pipeline 6 is closed, the preheating fuel enters the hot particle warehouse 3, and the preheating fuel is switched into the hot particle warehouse bypass pipeline 6 after the high-temperature solid coke is fully stored. The flexible coupling and decoupling of the preheating burner main body and the combustible hot particle warehouse are realized through the means, and the flexibility of the system is improved.
In the above embodiment, the storage device and the separation device are integrally provided, but in other embodiments, the separation device and the storage device may be separately provided, and whether to operate the separation device may be determined by setting the level monitoring of the storage device, which is also within the protection scope of the present invention and will not be described herein.
Based on the above, the present invention proposes the following technical solutions:
1. A boiler system, comprising:
A furnace including a fuel inlet;
the pretreatment device is used for pretreating the fuel and comprises a fuel outlet of the generated gas-solid mixed fuel;
the storage device is used for storing the solid fuel formed after the fuel is preprocessed by the preprocessing device; and
And the solid fuel conveying device is communicated with the storage device and is used for conveying the solid fuel to the hearth inlet through a solid fuel conveying pipeline.
2. The boiler system according to claim 1, further comprising:
A separation device in communication with the fuel outlet for separating at least a portion of the solid fuel from the gas-solid mixture fuel, the separation device comprising a gas outlet;
the storage device is used for storing the solid fuel separated from the separation device.
3. The boiler system according to claim 2, wherein:
The gas outlet communicates with the fuel inlet.
4. The boiler system according to claim 3, wherein:
The fuel inlet includes a first inlet and a second inlet spaced apart from each other, the first inlet communicating with the gas outlet, and the solid fuel delivery conduit communicating with the second inlet.
5. The boiler system according to claim 3, wherein:
The gas outlet shares the fuel inlet with the solid fuel delivery conduit.
6. The boiler system according to claim 2, wherein:
a first pipeline is arranged between the fuel outlet and the separation device, and a first valve is arranged on the first pipeline;
The boiler system further comprises a bypass arranged between the fuel outlet and the fuel inlet, and a bypass valve is arranged on the bypass.
7. The boiler system according to claim 6, wherein:
The bypass, the gas outlet and the outlet of the solid fuel delivery device share the fuel inlet.
8. The boiler system according to claim 6, wherein:
The fuel inlet includes a first inlet and a second inlet spaced apart from each other, the gas outlet and the bypass share the first inlet, and the outlet of the solid fuel delivery device communicates with the second inlet.
9. The boiler system according to claim 6, wherein:
the fuel inlet includes a first inlet, a second inlet, and a third inlet spaced apart from each other, and the gas outlet, the bypass, and the outlet of the solid fuel delivery device are in communication with the first inlet, the second inlet, and the third inlet, respectively.
10. The boiler system according to claim 2, wherein:
the separating device is arranged separately from the storage device and is adapted to stop operation based on the level in the storage device; or alternatively
The separation device and the storage device are integrated.
11. The boiler system according to claim 10, wherein:
The integrated device is a bin, a separating device is formed at the upper part of the bin, the separating device is a cyclone separator, and the gas-solid mixed fuel is suitable for entering the bin in a tangential direction.
12. The boiler system according to claim 1, wherein:
The storage device is a storage structure formed by a refractory material layer, a heat preservation material layer and a shell layer.
13. The boiler system according to claim 1, wherein:
The storage device is provided with an inert gas protection device, and the inert gas comprises nitrogen or carbon dioxide.
14. The boiler system according to any of claims 1-13, wherein:
The solid fuel conveying device comprises a feeder arranged below the storage device and the solid fuel conveying pipeline communicated with the lower part of the feeder, and the solid fuel conveying pipeline is communicated with the corresponding fuel inlet.
15. The boiler system according to claim 14, wherein:
the solid fuel delivery conduit includes a vapor conduit or an air conduit for providing a delivery gas.
16. The boiler system according to claim 14, wherein:
The feeder is a feeder suitable for controlling the feeding amount.
17. A control method of a boiler system, comprising the steps of:
pretreating fuel to be fed into a boiler furnace to generate gas-solid mixed fuel;
storing at least a portion of the solid fuel in the gas-solid fuel mixture; and
The stored solid fuel is conveyed to the hearth for combustion through a fuel inlet of the hearth through a solid fuel conveying pipeline based on the boiler load adjustment requirement or stable combustion requirement.
18. The method of claim 17, further comprising the step of:
the stored solid fuel is incubated so that the temperature of the solid fuel is not lower than 700 ℃ during 12 hours of storage.
19. The method of claim 17, wherein:
The feeder controls the amount or speed of the stored solid fuel delivered into the furnace.
20. The method of claim 19, wherein:
the solid fuel from the feeder is pneumatically conveyed into the furnace by steam or air.
21. The method according to claim 20, wherein:
In the case of air transport, the air quantity is 10-20% of the air required to completely burn the transported solid particles; or alternatively
Based on the temperature of the solid particles and the amount of steam or air as transport gas is adjusted such that the solid particles enter the furnace at a temperature of 800-1100 ℃.
22. The method of claim 17, comprising the steps of:
when the load of the boiler needs to be lifted, the stored solid fuel is conveyed to a hearth; and/or
In normal operation of the boiler, the storage device is brought to a full-bin state.
23. The method of any one of claims 17-22, wherein:
providing a pretreatment device for pretreating fuel to be fed into a boiler hearth to generate gas-solid mixed fuel, and enabling the generated gas-solid mixed fuel to flow out from a fuel outlet of the pretreatment device;
the method further comprises the steps of: performing a separation operation on the gas-solid mixed fuel from the fuel outlet by using a gas-solid separation device provided with a gas outlet to collect the separated solid fuel;
storing at least a portion of the solid fuel in the gas-solid mixed fuel includes storing the solid fuel collected by separation by the gas-solid separation device to a storage device.
24. The method of claim 23, wherein:
the separating device is arranged separately from the storage device and is adapted to stop operation based on the level in the storage device; or alternatively
The gas-solid separation device and the storage device are integrally arranged to form an integrated device.
25. The method according to claim 24, wherein:
The integrated device is a storage bin, a separation device is formed at the upper part of the storage bin, the separation device is a cyclone separator, and the gas-solid mixed fuel is suitable for entering the storage bin in a tangential direction; and is also provided with
The method comprises the steps of: after the gas-solid separation effect of the cyclone separator fails, the gas-solid mixed fuel generated after pretreatment is introduced into the hearth through the gas inlet of the gas-solid separator.
26. The method of claim 23, wherein:
a gas inlet of the gas-solid separator and the solid fuel delivery conduit share the fuel inlet; or alternatively
The fuel inlet comprises at least two fuel inlets, and the gas inlet of the gas-solid separator and the solid fuel conveying pipeline are respectively communicated with different fuel inlets.
27. The method of claim 23, wherein:
A first pipeline is arranged between the fuel outlet and the separation device, a first valve is arranged on the first pipeline, a bypass is arranged between the fuel outlet and the corresponding fuel inlet, and a bypass valve is arranged on the bypass;
the method further comprises the steps of: closing the first valve and opening the bypass valve to allow the gas-solid mixed fuel from the fuel outlet to pass to the corresponding fuel inlet; or opening the first valve and closing the bypass valve to store solid fuel in the storage device.
28. The method of claim 27, further comprising the step of:
After opening the first valve and closing the bypass valve to store the solid fuel in the storage device to a predetermined level, the first valve is closed and the bypass valve is opened to allow the gas-solid mixed fuel from the fuel outlet to pass to the corresponding fuel inlet.
29. The method according to claim 27, wherein:
the bypass is communicated with and converged with the gas outlet of the gas-solid separator and then led to the corresponding fuel inlet.
30. A fuel pretreatment apparatus comprising:
the pretreatment device is used for pretreating the fuel and comprises a fuel outlet of the generated gas-solid mixed fuel;
the storage device is used for storing the solid fuel formed after the fuel is preprocessed by the preprocessing device; and
And the solid fuel conveying device is communicated with the storage device and is used for conveying the solid fuel through a solid fuel conveying pipeline.
31. The apparatus of claim 30, wherein:
The storage device is a storage structure formed by a refractory material layer, a heat preservation material layer and a shell layer.
32. The apparatus of claim 31, wherein:
The storage device is provided with an inert gas protection device, and the inert gas comprises nitrogen or carbon dioxide.
33. The apparatus of claim 30, wherein:
The solid fuel conveying device comprises a feeder arranged below the storage device and the solid fuel conveying pipeline communicated with the lower part of the feeder, wherein the solid fuel conveying pipeline comprises a steam pipeline or an air pipeline for providing conveying gas; and/or
The feeder is a feeder suitable for controlling the feeding amount.
34. The apparatus of any one of claims 30-33, further comprising:
A separation device in communication with the fuel outlet for separating at least a portion of the solid fuel from the gas-solid mixture fuel, the separation device being provided with a gas outlet;
the storage device is used for storing the solid fuel separated from the separation device.
35. The apparatus of claim 34, wherein:
The gas outlet is communicated with or converged with the solid fuel conveying pipeline through a gas fuel conveying pipeline; or alternatively
The gaseous fuel delivery conduit communicating with the gaseous outlet and the solid fuel delivery conduit are independent of each other.
36. The apparatus of claim 34, wherein:
a first pipeline is arranged between the fuel outlet and the separation device, and a first valve is arranged on the first pipeline;
the apparatus further includes a bypass in communication with the fuel outlet, the bypass having a bypass valve disposed thereon.
37. The apparatus of claim 36, wherein:
the bypass, the gas outlet and the outlet of the solid fuel delivery device are communicated or merged; or alternatively
The gas outlet is communicated with or converged with the bypass, and the outlet of the solid fuel conveying device is independent of the gas outlet and the bypass; or alternatively
The gas outlet, the bypass and the outlet of the solid fuel delivery device are independent of each other.
38. The apparatus of claim 34, wherein:
the separating device is arranged separately from the storage device and is adapted to stop operation based on the level in the storage device; or alternatively
The separating device and the storage device are integrated, the integrated device is a storage bin, the separating device is formed at the upper part of the storage bin, the separating device is a cyclone separator, and the gas-solid mixed fuel is suitable for entering the storage bin in a tangential direction.
39. A method of fuel pretreatment comprising the steps of:
pretreating fuel to generate gas-solid mixed fuel;
storing at least a portion of the solid fuel in the gas-solid fuel mixture; and
The stored solid fuel is delivered to the combustion device via a solid fuel delivery conduit based on load regulation requirements or steady burning requirements.
40. The method of claim 39, wherein:
Providing a pretreatment device for pretreating fuel to generate gas-solid mixed fuel, wherein the generated gas-solid mixed fuel flows out from a fuel outlet of the pretreatment device;
the method further comprises the steps of: performing a separation operation on the gas-solid mixed fuel from the fuel outlet by using a gas-solid separation device to collect separated solid fuel;
storing at least a portion of the solid fuel in the gas-solid mixed fuel includes storing the solid fuel collected by separation by the gas-solid separation device to a storage device.
41. A preheat burner, comprising:
a fuel pre-treatment apparatus according to any one of claims 30 to 38; and
At least one fuel nozzle, the fuel outlet and the solid fuel delivery conduit being in communication with a corresponding fuel nozzle.
42. The preheat burner of claim 41, wherein:
the preheat burner is a preheat burner according to any of claims 34-38;
the gas outlets communicate with corresponding fuel jets.
43. The preheat burner of claim 42, wherein:
The gas outlet, the outlet of the solid fuel delivery conduit and the fuel outlet are each in communication with separate fuel jets or share a fuel jet
In the present invention, unless explicitly indicated otherwise, the numerical ranges include the end points, the middle points of the ranges, and the like.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes may be made and equivalents may be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (24)
1. A boiler system, comprising:
A furnace including a fuel inlet;
the pretreatment device is used for pretreating the fuel and comprises a fuel outlet of the generated gas-solid mixed fuel;
the storage device is used for storing the solid fuel formed after the fuel is preprocessed by the preprocessing device; and
And the solid fuel conveying device is communicated with the storage device and is used for conveying the solid fuel to the hearth inlet through a solid fuel conveying pipeline.
2. The boiler system according to claim 1, further comprising:
A separation device in communication with the fuel outlet for separating at least a portion of the solid fuel from the gas-solid mixture fuel, the separation device comprising a gas outlet;
the storage device is used for storing the solid fuel separated from the separation device.
3. The boiler system according to claim 2, wherein:
The gas outlet communicates with the fuel inlet.
4. A boiler system according to claim 3, wherein:
The fuel inlet includes a first inlet and a second inlet spaced apart from each other, the first inlet communicating with the gas outlet, and the solid fuel delivery conduit communicating with the second inlet.
5. A boiler system according to claim 3, wherein:
The gas outlet shares the fuel inlet with the solid fuel delivery conduit.
6. The boiler system according to claim 2, wherein:
a first pipeline is arranged between the fuel outlet and the separation device, and a first valve is arranged on the first pipeline;
The boiler system further comprises a bypass arranged between the fuel outlet and the fuel inlet, and a bypass valve is arranged on the bypass.
7. The boiler system according to claim 6, wherein:
The bypass, the gas outlet and the outlet of the solid fuel delivery device share the fuel inlet.
8. The boiler system according to claim 6, wherein:
The fuel inlet includes a first inlet and a second inlet spaced apart from each other, the gas outlet and the bypass sharing the first inlet, the outlet of the solid fuel delivery device communicating with the second inlet; or alternatively
The fuel inlet includes a first inlet, a second inlet, and a third inlet spaced apart from each other, and the gas outlet, the bypass, and the outlet of the solid fuel delivery device are in communication with the first inlet, the second inlet, and the third inlet, respectively.
9. The boiler system according to claim 2, wherein:
the separating device is arranged separately from the storage device and is adapted to stop operation based on the level in the storage device; or alternatively
The separation device and the storage device are integrated.
10. The boiler system according to claim 9, wherein:
The integrated device is a bin, a separating device is formed at the upper part of the bin, the separating device is a cyclone separator, and the gas-solid mixed fuel is suitable for entering the bin in a tangential direction.
11. The boiler system according to claim 1, wherein:
The storage device is a storage structure formed by a refractory material layer, a heat preservation material layer and a shell layer.
12. The boiler system according to any of claims 1-11, wherein:
The solid fuel conveying device comprises a feeder arranged below the storage device and the solid fuel conveying pipeline communicated with the lower part of the feeder, and the solid fuel conveying pipeline is communicated with the corresponding fuel inlet.
13. The boiler system according to claim 12, wherein:
The feeder is a feeder suitable for controlling the feeding amount.
14. A control method of a boiler system, comprising the steps of:
pretreating fuel to be fed into a boiler furnace to generate gas-solid mixed fuel;
storing at least a portion of the solid fuel in the gas-solid fuel mixture; and
The stored solid fuel is conveyed to the hearth for combustion through a fuel inlet of the hearth through a solid fuel conveying pipeline based on the boiler load adjustment requirement or stable combustion requirement.
15. The method of claim 14, further comprising the step of:
the stored solid fuel is incubated so that the temperature of the solid fuel is not lower than 700 ℃ during 12 hours of storage.
16. The method according to claim 14, wherein:
In the case of air transport, the air quantity is 10-20% of the air required to completely burn the transported solid particles; or alternatively
Based on the temperature of the solid particles and the amount of steam or air as transport gas is adjusted such that the solid particles enter the furnace at a temperature of 800-1100 ℃.
17. The method of claim 14, comprising the steps of:
when the load of the boiler needs to be lifted, the stored solid fuel is conveyed to a hearth; and/or
In normal operation of the boiler, the storage device is brought to a full-bin state.
18. The method of any one of claims 14-17, wherein:
providing a pretreatment device for pretreating fuel to be fed into a boiler hearth to generate gas-solid mixed fuel, and enabling the generated gas-solid mixed fuel to flow out from a fuel outlet of the pretreatment device;
the method further comprises the steps of: performing a separation operation on the gas-solid mixed fuel from the fuel outlet by using a gas-solid separation device provided with a gas outlet to collect the separated solid fuel;
storing at least a portion of the solid fuel in the gas-solid mixed fuel includes storing the solid fuel collected by separation by the gas-solid separation device to a storage device.
19. The method according to claim 18, wherein:
the gas-solid separation device and the storage device are integrally arranged to form an integrated device, the integrated device is a storage bin, the upper part of the storage bin is provided with a separation device, the separation device is a cyclone separator, and the gas-solid mixed fuel is suitable for entering the storage bin in a tangential direction; and is also provided with
The method comprises the steps of: after the gas-solid separation effect of the cyclone separator fails, the gas-solid mixed fuel generated after pretreatment is introduced into the hearth through the gas inlet of the gas-solid separator.
20. The method according to claim 18, wherein:
a gas inlet of the gas-solid separator and the solid fuel delivery conduit share the fuel inlet; or alternatively
The fuel inlet comprises at least two fuel inlets, and the gas inlet of the gas-solid separator and the solid fuel conveying pipeline are respectively communicated with different fuel inlets.
21. The method according to claim 18, wherein:
A first pipeline is arranged between the fuel outlet and the separation device, a first valve is arranged on the first pipeline, a bypass is arranged between the fuel outlet and the corresponding fuel inlet, and a bypass valve is arranged on the bypass;
the method further comprises the steps of: closing the first valve and opening the bypass valve to allow the gas-solid mixed fuel from the fuel outlet to pass to the corresponding fuel inlet; or opening the first valve and closing the bypass valve to store solid fuel in the storage device.
22. A fuel pretreatment apparatus comprising:
the pretreatment device is used for pretreating the fuel and comprises a fuel outlet of the generated gas-solid mixed fuel;
the storage device is used for storing the solid fuel formed after the fuel is preprocessed by the preprocessing device; and
And the solid fuel conveying device is communicated with the storage device and is used for conveying the solid fuel through a solid fuel conveying pipeline.
23. A method of fuel pretreatment comprising the steps of:
pretreating fuel to generate gas-solid mixed fuel;
storing at least a portion of the solid fuel in the gas-solid fuel mixture; and
The stored solid fuel is delivered to the combustion device via a solid fuel delivery conduit based on load regulation requirements or steady burning requirements.
24. A preheat burner, comprising:
The fuel pretreatment apparatus according to claim 22; and
At least one fuel nozzle, the fuel outlet and the solid fuel delivery conduit being in communication with a corresponding fuel nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211489104.4A CN118089048A (en) | 2022-11-25 | 2022-11-25 | Pretreatment equipment with process heat storage and release function and boiler system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211489104.4A CN118089048A (en) | 2022-11-25 | 2022-11-25 | Pretreatment equipment with process heat storage and release function and boiler system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118089048A true CN118089048A (en) | 2024-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211489104.4A Pending CN118089048A (en) | 2022-11-25 | 2022-11-25 | Pretreatment equipment with process heat storage and release function and boiler system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118089048A (en) |
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2022
- 2022-11-25 CN CN202211489104.4A patent/CN118089048A/en active Pending
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