CN216976779U - Combustion system for burning biomass black granular fuel - Google Patents
Combustion system for burning biomass black granular fuel Download PDFInfo
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- CN216976779U CN216976779U CN202123193560.8U CN202123193560U CN216976779U CN 216976779 U CN216976779 U CN 216976779U CN 202123193560 U CN202123193560 U CN 202123193560U CN 216976779 U CN216976779 U CN 216976779U
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Abstract
The utility model discloses a combustion system for burning biomass black granular fuel, which 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 an air feeder and an outlet of 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 the chimney through a desulfurization system, and the other path is communicated with the coal mill through a smoke cooling fan and a recirculated flue gas pipeline. The utility model 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 utility model 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-fired unit for 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 has advanced in the world in the aspects of clean energy utilization and low carbon emission reduction, research tests of coal-fired coupled biomass power generation have been started as early as over a decade 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 manner.
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.
SUMMERY OF THE UTILITY MODEL
The technical problems to be solved by the utility model are as follows: provides a combustion system and a method for burning biomass black granular fuel.
In order to solve the problems, the utility model 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 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 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 utility model, 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 utility model.
Detailed Description
In order to make the utility model 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 utility model 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 (2)
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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123193560.8U CN216976779U (en) | 2021-12-17 | 2021-12-17 | Combustion system for burning biomass black granular fuel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123193560.8U CN216976779U (en) | 2021-12-17 | 2021-12-17 | Combustion system for burning biomass black granular fuel |
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| Publication Number | Publication Date |
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| CN216976779U true CN216976779U (en) | 2022-07-15 |
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| CN202123193560.8U Active CN216976779U (en) | 2021-12-17 | 2021-12-17 | Combustion system for burning biomass black granular fuel |
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2021
- 2021-12-17 CN CN202123193560.8U patent/CN216976779U/en active Active
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