CN216619875U - Combustion and powder-making system of fan coal mill - Google Patents
Combustion and powder-making system of fan coal mill Download PDFInfo
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- CN216619875U CN216619875U CN202121397608.4U CN202121397608U CN216619875U CN 216619875 U CN216619875 U CN 216619875U CN 202121397608 U CN202121397608 U CN 202121397608U CN 216619875 U CN216619875 U CN 216619875U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
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Abstract
The utility model discloses a combustion and powder-making system of a fan coal mill, wherein an outlet of a hearth is communicated with a chimney through an air preheater and an induced draft fan, a smoke-pumping hole is arranged on the hearth and is communicated with an inlet of a high-temperature flue gas pipeline, an inlet of a cold smoke fan is communicated with an outlet of the induced draft fan, an outlet of the cold smoke fan is communicated with an inlet of a low-temperature flue gas pipeline, an inlet of a hot secondary air pipeline is communicated with an outlet of the air preheater, an outlet of the high-temperature flue gas pipeline, an outlet of the low-temperature flue gas pipeline and an outlet of the hot secondary air pipeline are communicated with an inlet of a mixing chamber, an outlet of the mixing chamber is communicated with an inlet of a coal dropping pipe, an outlet of a coal feeder is communicated with an inlet of the coal dropping pipe, an outlet of the coal dropping pipe is communicated with an inlet of the fan coal mill, and an outlet of the fan coal mill is communicated with inlets of burners on the hearth; each combustor evenly distributed on furnace, this system can make boiler heat load evenly distributed, and the water-cooling wall temperature distributes evenly, guarantees the safe economic operation of boiler.
Description
Technical Field
The utility model belongs to the field of thermal power generation, and relates to a fan coal mill combustion and pulverizing system.
Background
Lignite occupies about 13% of coal reserves in China, a power station unit for burning lignite is less, lignite power generation is one of the directions of thermal power generation in China, the water content of lignite is high, and a fan coal mill is generally used. The fan coal mill is arranged in a mode that the fan mill is generally in a tangential firing mode, and one fan coal mill is provided with a multi-layer burner with one corner. Under the degree of depth peak regulation mode, the operation coal pulverizer stand is less, and this kind of combustion method causes local heat load to concentrate easily, and the overtemperature condition appears easily in the water-cooling wall, causes the influence to boiler safety economic operation.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a fan coal mill combustion and pulverizing system, which can ensure that the heat load of a boiler is uniformly distributed, the wall temperature of a water-cooled wall is uniformly distributed, and the safe and economic operation of the boiler is ensured.
In order to achieve the purpose, the combustion and powder-making system of the fan coal mill comprises a hearth, an air preheater, an induced draft fan, a chimney, a high-temperature flue gas pipeline, a cold flue gas fan, a low-temperature flue gas pipeline, a hot secondary air pipeline, a mixing chamber, a coal dropping pipe and a fan coal mill;
the outlet of the hearth is communicated with a chimney through an air preheater and an induced draft fan, the hearth is provided with a smoke extraction port, the smoke extraction port is communicated with the inlet of a high-temperature flue gas pipeline, the inlet of a cold flue gas fan is communicated with the outlet of the induced draft fan, the outlet of the cold flue gas fan is communicated with the inlet of a low-temperature flue gas pipeline, the inlet of a hot secondary air pipeline is communicated with the outlet of the air preheater, the outlet of the high-temperature flue gas pipeline, the outlet of the low-temperature flue gas pipeline and the outlet of the hot secondary air pipeline are communicated with the inlet of a mixing chamber, the outlet of the mixing chamber is communicated with the inlet of a coal dropping pipe, the outlet of a coal feeder is communicated with the inlet of a coal dropping pipe, the outlet of the coal dropping pipe is communicated with the inlet of a fan coal mill, and the outlet of the fan coal mill is communicated with the inlets of burners on the hearth; the burners are uniformly distributed on the hearth.
And a first regulating valve is arranged on the hot secondary air pipeline.
And a second regulating valve is arranged on the high-temperature flue gas pipeline.
And a third regulating valve is arranged on the low-temperature flue gas pipeline.
For a large boiler, the number of the fan coal mills is two, the pulverized coal airflow outlets of each fan coal mill are divided into two groups, all the burners are divided into two layers, one fan coal mill corresponds to one layer of burners, one group of pulverized coal airflow outlets corresponds to half-layer burners, one pulverized coal airflow outlet corresponds to one burner, each pulverized coal airflow outlet is communicated with the corresponding burner through a pulverized coal pipeline, and each fan coal mill is provided with 4-8 pulverized coal airflow outlets.
For a small boiler, the number of the fan coal mills is one, and one fan coal mill is provided with a plurality of pulverized coal airflow outlets, one pulverized coal airflow outlet corresponds to one burner, and each pulverized coal airflow outlet is communicated with the inlet of the corresponding burner through a pulverized coal pipeline.
A pressurizing fan is arranged between the outlet of the mixing chamber and the coal dropping pipe.
When the coal feeder works, hot secondary air, high-temperature flue gas and low-temperature flue gas are mixed in the mixing chamber to serve as drying media, raw coal output by the coal feeder is dried, and then the raw coal is sent into the fan coal mill.
The utility model has the following beneficial effects:
when the combustion and powder-making system of the fan coal mill is in specific operation, the fan coal mill adopts a three-medium drying mode of hot secondary air, high-temperature flue gas and low-temperature flue gas, the high-temperature flue gas is a main ventilation mode of the coal mill, the hot secondary air and the low-temperature flue gas mainly adjust the air powder temperature at the inlet and the outlet of the coal mill and the oxygen quantity of a drying medium at the inlet of the coal mill, the oxygen quantity of the drying medium is reduced after the hot secondary air and the flue gas are mixed, high-volatile lignite can be prevented from explosion, the hot secondary air and the flue gas are mixed to be used as the drying medium, the temperature level of a burner area can be reduced after entering a hearth, and slag bonding in the furnace is avoided, wherein the drying medium is used as primary air to convey pulverized coal into the hearth for combustion, so that the heat load in the combustion process is uniformly distributed. Meanwhile, the burners are uniformly distributed in the hearth, the wall temperature of the water-cooled wall is uniformly distributed, the safe and economic operation of the boiler is ensured, and the combustion is stable.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a distribution diagram of the burners 9 on a large boiler;
FIG. 3 is a schematic diagram of the distribution of burners 9 on each floor of a large boiler;
FIG. 4 is a distribution diagram of the burners 9 on the small boiler;
fig. 5 is a schematic view of the distribution of burners 9 in each layer on a small boiler.
Wherein, 1 is a hearth, 2 is a coal feeder, 3 is a fan coal mill, 4 is a pulverized coal pipeline, 5 is a hot secondary air pipeline, 6 is a high-temperature flue gas pipeline, 7 is a low-temperature flue gas pipeline, 8 is a mixing chamber, 9 is a combustor, 10 is a smoke extraction port, 11 is an induced draft fan, 12 is an air preheater, 13 is a cold smoke blower, 14 is a pressurizing blower, 151 is a first regulating valve, 152 is a second regulating valve, and 153 is a third regulating valve.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the combustion and pulverizing system of the fan coal mill of the present invention includes a furnace 1, an air preheater 12, an induced draft fan 11, a chimney, a high temperature flue gas pipeline 6, a cold flue gas fan 13, a low temperature flue gas pipeline 7, a hot secondary air pipeline 5, a mixing chamber 8, a coal dropping pipe and a fan coal mill 3; an outlet of the hearth 1 is communicated with a chimney through an air preheater 12 and an induced draft fan 11, a smoke exhaust port 10 is arranged on the hearth 1, the smoke exhaust port 10 is communicated with an inlet of a high-temperature smoke pipeline 6, an inlet of a cold smoke fan 13 is communicated with an outlet of the induced draft fan 11, an outlet of the cold smoke fan 13 is communicated with an inlet of a low-temperature smoke pipeline 7, an inlet of a hot secondary air pipeline 5 is communicated with an outlet of the air preheater 12, an outlet of the high-temperature smoke pipeline 6, an outlet of the low-temperature smoke pipeline 7 and an outlet of the hot secondary air pipeline 5 are communicated with an inlet of a mixing chamber 8, an outlet of the mixing chamber 8 is communicated with an inlet of a coal dropping pipe, an outlet of a coal feeder 2 is communicated with an inlet of the coal dropping pipe, an outlet of the coal dropping pipe is communicated with an inlet of a fan coal mill 3, and an outlet of the fan coal mill 3 is communicated with inlets of burners 9 on the hearth 1; the burners 9 are evenly distributed on the hearth 1.
The hot secondary air pipeline 5 is provided with a first regulating valve 151; the high-temperature flue gas pipeline 6 is provided with a second regulating valve 152; a third regulating valve 153 is arranged on the low-temperature flue gas pipeline 7; a pressurizing fan 14 is arranged between the outlet of the mixing chamber 8 and the coal dropping pipe.
Referring to fig. 2 and 3, for a large boiler, the number of the fan coal mills 3 is two, the pulverized coal airflow outlets of each fan coal mill 3 are divided into two groups, and all the burners 9 are divided into two layers, wherein one fan coal mill 3 corresponds to one layer of burner 9, one group of pulverized coal airflow outlets corresponds to a half-layer of burner 9, one pulverized coal airflow outlet corresponds to one burner 9, each pulverized coal airflow outlet is communicated with the corresponding burner 9 through a pulverized coal pipeline 4, and each fan coal mill 3 is provided with 4-8 pulverized coal airflow outlets.
Referring to fig. 4 and 5, for a small boiler, the number of the fan coal mills 3 is one, and one fan coal mill 3 is provided with a plurality of pulverized coal airflow outlets, one pulverized coal airflow outlet corresponds to one burner 9, and each pulverized coal airflow outlet is communicated with the inlet of the corresponding burner 9 through the pulverized coal pipeline 4.
The specific working process of the utility model is as follows:
the hot secondary air, the high-temperature flue gas and the low-temperature flue gas are mixed in the mixing chamber 8 to be used as drying media, the raw coal sent by the coal feeder 2 is dried and then sent into the fan coal mill 3 to be ground, wherein the pressure of the drying media is increased through the booster fan 14, the drying media are used as primary air to send coal powder into the hearth 1 to be combusted, so that the heat load in the combustion process is uniformly distributed, the hot secondary air in the drying media comes from the outlet of the air preheater 12, the high-temperature flue gas comes from the smoke extraction opening 10 of the hearth 1, the low-temperature flue gas is extracted from the outlet of the induced draft fan 11 through the cold flue gas fan 13, the flow of the hot secondary air is adjusted through the first adjusting valve 151, the flow of the high-temperature flue gas is adjusted through the second adjusting valve 152, and the flow of the low-temperature flue gas is adjusted through the third adjusting valve 153.
For example, when there are 6 fan coal mills 3, each fan coal mill 3 is provided with 8 coal dust pipelines 4, 48 coal dust pipelines 4 are arranged, 48 corresponding burners 9 are arranged, 6 layers of burners 9 are arranged in the furnace 1, 4-8 burners are arranged on each layer of burners 9, and each fan coal mill 3 is provided with 4 adjacent two layers of burners 9, so that the heat load of the water cooled wall of the boiler is uniform, no over-temperature is caused, the combustion is stable, and the advantages of the operation mode are more obvious in a deep peak regulation mode.
Claims (7)
1. A combustion and powder-making system of a fan coal mill is characterized by comprising a hearth (1), an air preheater (12), an induced draft fan (11), a chimney, a high-temperature flue gas pipeline (6), a cold flue gas fan (13), a low-temperature flue gas pipeline (7), a hot secondary air pipeline (5), a mixing chamber (8), a coal dropping pipe and a fan coal mill (3);
the outlet of the hearth (1) is communicated with a chimney through an air preheater (12) and an induced draft fan (11), a smoke exhaust port (10) is arranged on the hearth (1), the smoke exhaust port (10) is communicated with the inlet of a high-temperature smoke pipeline (6), the inlet of a cold smoke fan (13) is communicated with the outlet of the induced draft fan (11), the outlet of the cold smoke fan (13) is communicated with the inlet of a low-temperature smoke pipeline (7), the inlet of a hot secondary air pipeline (5) is communicated with the outlet of the air preheater (12), the outlet of the high-temperature smoke pipeline (6), the outlet of the low-temperature smoke pipeline (7) and the outlet of the hot secondary air pipeline (5) are communicated with the inlet of a mixing chamber (8), the outlet of the mixing chamber (8) is communicated with the inlet of a coal dropping pipe, the outlet of a coal feeder (2) is communicated with the inlet of the coal dropping pipe, the outlet of the coal feeder is communicated with the inlet of a fan coal mill (3), the outlet of the fan coal mill (3) is communicated with the inlet of each combustor (9) on the hearth (1); the burners (9) are uniformly distributed on the hearth (1).
2. The fan pulverizer combustion and pulverizing system of claim 1, wherein the hot secondary air duct (5) is provided with a first regulating valve (151).
3. The fan pulverizer combustion and pulverizing system of claim 2, wherein the high temperature flue gas duct (6) is provided with a second regulating valve (152).
4. The fan pulverizer combustion and pulverizing system of claim 3, wherein the low temperature flue gas duct (7) is provided with a third regulating valve (153).
5. The fan coal mill combustion and pulverizing system of claim 1, wherein for large boilers, the number of the fan coal mills (3) is two, the pulverized coal airflow outlets of each fan coal mill (3) are divided into two groups, all the burners (9) are divided into two layers, wherein one fan coal mill (3) corresponds to one layer of burners (9), one group of pulverized coal airflow outlets corresponds to a half-layer of burners (9), one pulverized coal airflow outlet corresponds to one burner (9), each pulverized coal airflow outlet is communicated with the corresponding burner (9) through a pulverized coal pipeline (4), and each fan coal mill (3) is provided with 4-8 pulverized coal airflow outlets.
6. The fan coal mill combustion and pulverizing system of claim 1, characterized in that for small boilers, the number of the fan coal mills (3) is one, and one fan coal mill (3) is provided with a plurality of pulverized coal airflow outlets, one pulverized coal airflow outlet corresponds to one burner (9), and each pulverized coal airflow outlet is communicated with the inlet of the corresponding burner (9) through the pulverized coal pipe (4).
7. The fan pulverizer combustion and pulverizing system of claim 1, wherein a booster fan (14) is disposed between the outlet of the mixing chamber (8) and the coal drop tube.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120922818 | 2021-04-29 | ||
| CN2021209228184 | 2021-04-29 |
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| CN216619875U true CN216619875U (en) | 2022-05-27 |
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| CN202121397608.4U Active CN216619875U (en) | 2021-04-29 | 2021-06-22 | Combustion and powder-making system of fan coal mill |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113503562A (en) * | 2021-04-29 | 2021-10-15 | 西安热工研究院有限公司 | Combustion and powder-making system of fan coal mill |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113503562A (en) * | 2021-04-29 | 2021-10-15 | 西安热工研究院有限公司 | Combustion and powder-making system of fan coal mill |
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