CN114198745A - Combustion system and method for burning biomass black granular fuel - Google Patents
Combustion system and method for burning biomass black granular fuel Download PDFInfo
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- CN114198745A CN114198745A CN202111549882.3A CN202111549882A CN114198745A CN 114198745 A CN114198745 A CN 114198745A CN 202111549882 A CN202111549882 A CN 202111549882A CN 114198745 A CN114198745 A CN 114198745A
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- coal mill
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- flue gas
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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
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/003—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for pulverulent fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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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
- F23C2202/00—Fluegas recirculation
- F23C2202/10—Premixing fluegas with fuel and combustion air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/10—Pulverizing
- F23K2201/103—Pulverizing with hot gas supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2203/00—Feeding arrangements
- F23K2203/20—Feeding/conveying devices
- F23K2203/201—Feeding/conveying devices using pneumatic means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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Abstract
The invention discloses a combustion system and a method for burning biomass black granular fuel. The combustion system comprises a raw material bin, a coal feeder and a coal mill, wherein an outlet of the denitration device is connected with a flue gas inlet of the air preheater, a flue gas outlet of the air preheater is sequentially connected with a dust remover and an induced draft fan, a cold air inlet of the air preheater is connected with outlets of a blower and a primary fan, and a hot air outlet of the air preheater is communicated with the boiler body and the coal mill; the outlet of the primary air fan is also communicated with a coal mill; the outlet of the draught fan is connected with a chimney and a coal mill. The low-temperature circulating flue gas is fed into a hot air pipe to be mixed and then fed into a coal mill, unheated primary air generated by a primary fan is also fed into the hot air pipe to be mixed, and the mixture of cold air, cold flue gas and hot air is fed into the coal mill to be milled. The invention can adjust the temperature and the oxygen concentration of the hearth outlet, adjust the combustion condition of the black particle fuel and ensure that the boiler has stronger adaptability to the black particle combustion.
Description
Technical Field
The invention relates to a combustion system for burning biomass black granular fuel, and belongs to the technical field of biomass black granular fuel combustion.
Background
Coal burner assemblyIn CO2Emission reduction faces great pressure, and CO is generated by modifying a coal-fired unit to burn biomass particles or by coupling combustion with coal2One of the most effective approaches. The europe is leading to the world in terms of clean energy utilization and low carbon emission reduction, research and test of coal-fired coupled biomass power generation is started as early as ten years ago, and at present, a plurality of large coal-fired power stations are changed into biomass power stations which burn biomass solid particle fuel completely or in a mixed mode.
The biomass black granular fuel belongs to fuel with ultrahigh volatile, high heat value, ultralow ash, ultralow total moisture, ultralow sulfur, ultralow softening temperature ash, difficult grinding, easy explosion and serious slag bonding. The ignition temperature is about 240 ℃, and the fire is easy to catch fire. Which is quite different from the characteristics of coal.
At present, the success of a large coal-electric machine set for fully burning wood raw material biomass black granular fuel is in the blank of domestic technology. In the prior art, biomass granular fuel is directly used for replacing conventional coal fuel in the transformation process of most boilers, and the boilers and various systems are not correspondingly evaluated and transformed, so that the problems of unstable operation, insufficient combustion, serious coking, corrosion of heating surfaces and the like of the boilers are caused. Because the difference between the characteristics of the biomass black granular fuel and the characteristics of the coal fuel is large, when the biomass black granular fuel is used for replacing the conventional coal fuel, the existing boiler to be retired or already retired needs to be optimized and modified.
Therefore, how to safely and stably burn biomass black particles in an out-of-service boiler or an out-of-service boiler is an urgent problem to be solved.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: provides a combustion system and a method for burning biomass black granular fuel.
In order to solve the problems, the invention provides a combustion system for burning biomass black granular fuel, which sequentially comprises a raw material bin, a coal feeder and a coal mill, wherein an outlet of the coal mill is connected with a boiler body, a denitration device is arranged at the tail part of the boiler body, an outlet of the denitration device is connected with a flue gas inlet of an air preheater, a flue gas outlet of the air preheater is sequentially connected with a dust remover and an induced draft fan, a cold air inlet of the air preheater is connected with outlets of a blower and a primary air fan, a hot air outlet of the air preheater is divided into two paths, one path is communicated with the boiler body, and the other path is communicated with the coal mill through a hot air pipe; the outlet of the primary air fan is also communicated with a coal mill through a cold air pipe; the outlet of the induced draft fan is divided into two paths, one path is connected with a chimney through a desulfurization system, and the other path is communicated with a coal mill through a smoke cooling fan and a recirculated smoke pipeline.
Preferably, after the outlets of the induced draft fan and the cold air pipe are communicated with the hot air pipe, the hot air pipe is communicated with the coal mill; and the flue gas generated by the induced draft fan, the unheated cold air generated by the primary air fan and the hot air generated by the air preheater are mixed in the hot air pipe and then enter the coal mill together. And hot air in the hot air pipe at the inlet of the coal mill is sent to the air preheater by the primary fan for heating. And the secondary air is sent into the air preheater by the blower to be heated and then sent into the boiler hearth.
The invention also provides a method for burning biomass black granular fuel, which adopts the combustion system, low-temperature circulating smoke is extracted from the outlet of the induced draft fan and sent into the hot air pipe through the smoke cooling fan to be mixed, then the mixture is sent into the coal mill, simultaneously, unheated primary air generated by a part of primary fans is also sent into the hot air pipe to be mixed, and cold air, cold smoke and hot air are mixed and sent into the coal mill to be milled.
Preferably, the mixed gas temperature at the inlet of the coal mill and the air powder temperature at the outlet of the coal mill are adjusted by controlling the circulation rate of the recirculated flue gas in the recirculated flue gas pipeline and the cold air volume of the cold flue gas fan.
Preferably, the oxygen content in the coal mill is adjusted by controlling the circulation ratio of the recirculated flue gas in the recirculated flue gas pipeline.
More preferably, the circulation ratio of the recirculated flue gas is controlled between 0.1 and 0.2.
More preferably, the temperature of the mixed gas at the inlet of the coal mill is controlled between 180 ℃ and 220 ℃.
More preferably, the temperature of the pulverized coal at the outlet of the coal mill is controlled between 80 and 110 ℃.
More preferably, the volume concentration of oxygen in the gas at the outlet of the coal mill is controlled to be between 10 and 12 percent.
Preferably, the primary air volume of the combustion system is controlled within 15% -25% of the total air volume. The total air volume is the air volume fed by the primary air fan and the secondary air fan, the primary air volume is the air volume fed by the primary air fan, and the total air volume is divided into two parts, wherein one part is called primary air cold air without being heated by the air preheater, and the other part is called primary air hot air after being heated by the air preheater.
Preferably, the excess air ratio of the combustion system is controlled between 1.1 and 1.3. The excess air ratio is an index of the composition of the passing combustible mixture and is generally represented by the symbol alpha. Alpha is equal to the mass of air actually supplied by 1kg of fuel divided by the theoretical mass of air required to completely combust 1kg of fuel.
The cold circulation flue gas is introduced to reduce the temperature and the oxygen content of the drying agent for coal pulverizing of the coal pulverizer, so that the deflagration accident generated in the coal pulverizer is prevented by controlling the temperature and the oxygen content of the drying agent at the inlet of the coal pulverizer, and the safety of coal pulverizing is ensured.
According to the invention, the recirculated cold smoke, hot air and cold air are added to be mixed and enter the coal mill from the coal mill inlet air duct to be milled on the basis of the original boiler design, the milling atmosphere in the coal mill and the combustion atmosphere in the hearth are changed to a certain extent, and the temperature and the oxygen concentration at the outlet of the hearth can be adjusted by adjusting the circulation multiplying power of the smoke, so that the combustion condition of black particle fuel can be adjusted, the adaptability of the boiler to black particle combustion is stronger, on the other hand, the safety of the coal mill is ensured, the deflagration accident is prevented, and the long-term, stable, safe and efficient operation of the boiler is ensured.
Drawings
FIG. 1 is a schematic view of a combustion system for burning biomass black granular fuel provided by the invention.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Examples
As shown in fig. 1, the combustion system for burning biomass black granular fuel provided by the invention sequentially comprises a raw material bin 1, a coal feeder 2 and a coal pulverizer 3, wherein an outlet of the coal pulverizer 3 is connected with a boiler body 4, a tail part of the boiler body 4 is provided with a denitration device 5, an outlet of the denitration device 5 is connected with a flue gas inlet of an air preheater 6, a flue gas outlet of the air preheater 6 is sequentially connected with a dust remover 7 and an induced draft fan 14, a cold air inlet of the air preheater 6 is connected with outlets of a blower 16 and a primary fan 15, a hot air outlet of the air preheater 6 is divided into two paths, one path is communicated with the boiler body 4, and the other path is communicated with the coal pulverizer 3 through a hot air pipe 11; the outlet of the primary air fan 15 is also communicated with the coal mill 3 through a cold air pipe 10; the outlet of the induced draft fan 14 is divided into two paths, one path is connected with a chimney 9 through a desulfurization system 8, and the other path is communicated with the coal mill 3 through a smoke cooling fan 13 and a recirculating smoke pipeline 12. After the outlets of the induced draft fan 14 and the cold air pipe 10 are communicated with the hot air pipe 11, the hot air pipe 11 is communicated with the coal mill 3; the flue gas generated by the induced draft fan 14, the unheated cold air generated by the primary air fan 15 and the hot air generated by the air preheater 6 are mixed in the hot air pipe 11 and then enter the coal pulverizer 3 together.
A method for burning biomass black granular fuel comprises the following steps:
low-temperature circulating flue gas is extracted from an outlet of a draught fan 14, is sent into a hot air pipe 11 through a cold flue gas fan 13 to be mixed, and then is sent into a coal mill 3, meanwhile, unheated primary air generated by a part of primary air fans 15 is also sent into the hot air pipe 11 to be mixed, and cold air, cold flue gas and hot air are mixed and sent into the coal mill to be milled; the mixed gas temperature at the inlet of the coal mill 3 and the air powder temperature at the outlet of the coal mill 3 are adjusted by controlling the circulation rate of the recirculated flue gas in the recirculated flue gas pipeline 12 and the cold air quantity of the cold flue gas fan 13; the oxygen content in the coal mill is adjusted by controlling the circulation ratio of the recirculated flue gas in the recirculated flue gas pipeline 12.
The secondary air is sent into the coal mill 3 by the blower 16, heated and then sent into the hearth of the boiler body 4.
The circulation ratio of the recirculated flue gas is controlled between 0.1 and 0.2.
The temperature of the mixed gas at the inlet of the coal mill 3 is controlled between 180 ℃ and 220 ℃.
The temperature of the air powder at the outlet of the coal mill 3 is controlled between 80 and 110 ℃.
The volume concentration of oxygen in the gas at the outlet of the coal mill 3 is controlled between 10 and 12 percent.
The primary air volume of the combustion system is controlled within 15% -25% of the total air volume.
The excess air ratio of the combustion system is controlled between 1.1 and 1.3.
The cold circulation flue gas is introduced to reduce the temperature and the oxygen content of the drying agent for coal pulverizing of the coal pulverizer, so that the deflagration accident generated in the coal pulverizer is prevented by controlling the temperature and the oxygen content of the drying agent at the inlet of the coal pulverizer, and the safety of coal pulverizing is ensured.
Claims (10)
1. The combustion system for burning biomass black granular fuel is characterized by sequentially comprising a raw material bin (1), a coal feeder (2) and a coal mill (3), wherein an outlet of the coal mill (3) is connected with a boiler body (4), a denitration device (5) is arranged at the tail of the boiler body (4), an outlet of the denitration device (5) is connected with a flue gas inlet of an air preheater (6), a flue gas outlet of the air preheater (6) is sequentially connected with a dust remover (7) and an induced draft fan (14), a cold air inlet of the air preheater (6) is connected with a blower (16) and an outlet of a primary fan (15), a hot air outlet of the air preheater (6) is divided into two paths, one path is communicated with the boiler body (4), and the other path is communicated with the coal mill (3) through a hot air pipe (11); the outlet of the primary fan (15) is also communicated with the coal mill (3) through a cold air pipe (10); the outlet of the induced draft fan (14) is divided into two paths, one path is connected with the chimney (9) through the desulfurization system (8), and the other path is communicated with the coal mill (3) through the cold smoke fan (13) and the recirculation smoke pipeline (12).
2. The combustion system for burning biomass black granular fuel as claimed in claim 1, wherein after the outlets of the induced draft fan (14) and the cold air pipe (10) are communicated with the hot air pipe (11), the hot air pipe (11) is communicated with the coal mill (3); flue gas generated by the induced draft fan (14), cold air which is generated by the primary air fan (15) and is not heated and hot air generated by the air preheater (6) are mixed in the hot air pipe (11) and then enter the coal mill (3).
3. A method for burning biomass black granular fuel is characterized in that the combustion system of claim 2 is adopted, low-temperature circulating flue gas is extracted from the outlet of an induced draft fan (14) and is sent into a hot air pipe (11) through a cold flue gas fan (13) to be mixed, then the mixture is sent into a coal mill (3), simultaneously, unheated primary air generated by a part of primary air fans (15) is also sent into the hot air pipe (11) to be mixed, and the mixture is sent into the coal mill to be pulverized by adopting a cold air medium, a cold flue gas medium and a hot air medium.
4. The method for burning the biomass black granular fuel as claimed in claim 3, wherein the mixed gas temperature at the inlet of the coal mill (3) and the wind powder temperature at the outlet of the coal mill (3) are adjusted by controlling the circulation rate of the recirculated flue gas in the recirculated flue gas pipeline (12) and the cool wind amount of the cool wind fan (13).
5. The method for burning biomass black granular fuel according to claim 3, characterized in that the oxygen content in the coal mill is adjusted by controlling the circulation rate of the recirculated flue gas in the recirculated flue gas pipeline (12).
6. The method for burning the biomass black granular fuel as claimed in claim 4 or 5, wherein the circulation ratio of the recirculated flue gas is controlled between 0.1 and 0.2.
7. The method for burning the biomass black granular fuel as claimed in claim 4, wherein the temperature of the mixed gas at the inlet of the coal mill (3) is controlled between 180 ℃ and 220 ℃.
8. The method for burning biomass black granular fuel as claimed in claim 4, characterized in that the temperature of the air dust at the outlet of the coal mill (3) is controlled between 80 ℃ and 110 ℃.
9. The method for burning biomass black granular fuel as claimed in claim 4, characterized in that the volume concentration of oxygen in the gas at the outlet of the coal mill (3) is controlled between 10-12%.
10. The method for burning the biomass black granular fuel as claimed in claim 3, wherein the primary air quantity of the combustion system is controlled within 15% -25% of the total air quantity; the excess air ratio of the combustion system is controlled between 1.1 and 1.3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111549882.3A CN114198745A (en) | 2021-12-17 | 2021-12-17 | Combustion system and method for burning biomass black granular fuel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111549882.3A CN114198745A (en) | 2021-12-17 | 2021-12-17 | Combustion system and method for burning biomass black granular fuel |
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| CN114198745A true CN114198745A (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111549882.3A Pending CN114198745A (en) | 2021-12-17 | 2021-12-17 | Combustion system and method for burning biomass black granular fuel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704847A (en) * | 2022-04-28 | 2022-07-05 | 西安热工研究院有限公司 | System for promoting drying output of direct-fired pulverizing system |
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2021
- 2021-12-17 CN CN202111549882.3A patent/CN114198745A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704847A (en) * | 2022-04-28 | 2022-07-05 | 西安热工研究院有限公司 | System for promoting drying output of direct-fired pulverizing system |
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