CN219014362U - Coal-fired boiler unit - Google Patents
Coal-fired boiler unit Download PDFInfo
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- CN219014362U CN219014362U CN202223452699.4U CN202223452699U CN219014362U CN 219014362 U CN219014362 U CN 219014362U CN 202223452699 U CN202223452699 U CN 202223452699U CN 219014362 U CN219014362 U CN 219014362U
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a coal-fired boiler unit, which relates to the technical field of coal-fired units and comprises an air preheater, a medium-speed coal mill, a boiler, a fine powder separator, a powder feeder and a powder bin; the air preheater is respectively communicated with the boiler through the medium-speed coal mill and the powder feeder, the medium-speed air coal mill is communicated with the fine powder separator, the fine powder separator is communicated with the powder bin, and the powder bin is communicated with the powder feeder. Aiming at the problems that when the flexibility of the boiler reduces the load, the medium-speed coal mill needs to reduce the output operation, and the vibration and the large current fluctuation of the medium-speed coal mill are very easy to occur, on one hand, the medium-speed coal mill can be directly shut down under the condition of low load, the power consumption is saved, and the safety is improved; on the other hand, the pulverized coal concentration of primary air entering the boiler is ensured, the combustion stability and the burnout property of the pulverized coal in the boiler are ensured, the exhaust gas temperature is reduced, and the boiler efficiency is improved; the economy of the unit is improved.
Description
Technical Field
The utility model relates to the technical field of coal-fired units, in particular to a coal-fired boiler unit.
Background
Under the new situation of energy saving, emission reduction and energy saving power generation scheduling, the coal-fired units are ordered from low to high according to the energy consumption level, electric quantity scheduling is carried out according to the energy consumption level, and the optimal scheduling is implemented in a mode of sorting in a dividing way, optimizing in an area and coordinating among areas, and is combined with power market construction work, so that the effect of a power market is fully exerted, and the minimum energy consumption and pollutant emission in unit electric energy production are striven. With gradual release of the contradiction between power supply and demand, new power supply points are put into operation continuously, production and development of high-energy-consumption coal-fired power generation enterprises are limited, and the operation situation becomes very severe and is subject to vigorous competition. The company only strives for market share to the outside, manages the inside reinforcement, reduces the energy consumption to the maximum extent, and carries out technology update and transformation on the main and auxiliary machines with low efficiency and high consumption, so that the company can survive and develop in strong market competition.
In order to realize the double-carbon target as expected, new energy sources such as solar energy, wind power and the like are greatly developed in China for several years, meanwhile, a coal-fired unit is required to give way to the new energy sources, under normal conditions, the supply of the electric quantity of the new energy sources is prioritized, and the rest is supplemented by the coal-fired unit.
However, the new energy power generation is limited by the changes of conditions such as illumination, environment and the like, and the power generation load cannot be stabilized, so that the coal-fired power plant is required to be capable of adapting to the changes of the new energy load, and the system has great flexibility and adaptability.
However, the equipment (especially the medium-speed coal mill) matched with the coal-fired unit is designed and selected according to the full load, when the unit load is too low, the equipment operates in a small-output state and is in a state of pulling the trolley by the bull, and the forage amount of the bull per day is the same regardless of the size of the trolley. The power consumption of the medium-speed coal mill is still high when the unit is under low load; in addition, the medium speed coal mill is very prone to vibration problems due to the rapid decrease in coal quantity during low load operation.
Disclosure of Invention
The utility model aims to provide a coal-fired boiler unit for solving the problems in the background technology.
In order to solve the technical problems, the utility model provides the following technical scheme: the utility model provides a coal-fired pot unit, includes air heater, medium speed coal pulverizer, boiler, fine powder separator, powder feeder, powder storehouse, air heater communicates with the boiler through medium speed coal pulverizer and powder feeder respectively, medium speed air pulverizer and fine powder separator intercommunication, fine powder separator and powder storehouse intercommunication, powder storehouse and powder feeder intercommunication.
Further, the hot air at the outlet of the air preheater is divided into overgrinding hot air and bypass hot air, the overgrinding hot air pipeline is communicated with the air medium-speed coal mill through an overgrinding hot air valve, and the bypass hot air pipeline is communicated with the powder feeder through a bypass hot air valve.
Further, the powder-carrying air at the outlet of the medium-speed coal mill is divided into main-path powder-carrying air and bypass powder-carrying air, the main-path powder-carrying air pipeline is communicated with the boiler through a main-path powder-carrying air valve, and the bypass powder-carrying air pipeline is communicated with the fine powder separator through a bypass powder-carrying air valve.
Further, a tertiary air pipeline at the top of the fine powder separator is communicated with a main-path dust-carrying air pipeline, and a tertiary air valve is arranged on the tertiary air pipeline.
Further, a pulverized coal pipeline at the bottom of the fine powder separator is communicated with the powder bin.
Further, a primary air pipeline of the powder feeder outlet is communicated with the boiler through a bypass primary air valve.
Compared with the prior art, the utility model has the following beneficial effects:
1. the utility model is provided with an air preheater, a medium speed coal mill, a boiler, a fine powder separator, a powder feeder and a powder bin, when the load of the boiler is higher, a bypass hot air valve and a bypass primary air valve are closed, and a overgrinding hot air valve, a bypass powder air valve, a main path powder air valve and a tertiary air valve are opened; at the moment, all hot air at the outlet of the air preheater enters a medium-speed coal mill to dry raw coal in a mode of overgrinding the hot air; the bypass pulverized air enters a fine powder separator to perform air-powder separation, separated pulverized coal is stored in a powder bin, and separated tertiary air is mixed with main pulverized air and then is used as primary air entering a boiler to be sent to the boiler for combustion; when the powder level of the pulverized coal in the powder bin reaches a certain requirement, the bypass powder carrying air valve and the tertiary air valve are closed, and all the powder carrying air at the outlet of the medium-speed coal mill enters the boiler for combustion in a main powder carrying air mode; when the load of the boiler is reduced to below 30%, overgrinding hot air enters a medium-speed coal mill to dry raw coal, and bypass hot air is used as powder feeding air; the bypass hot air is connected with the powder feeder, and the bypass air with powder stops running; the bypass hot air carries the pulverized coal stored in the powder bin at the powder feeder to be changed into primary air which enters the boiler and is sent to the boiler for combustion;
2. aiming at the problems that when the flexibility of the boiler reduces the load, the medium-speed coal mill needs to reduce the output operation, and the vibration and the large current fluctuation of the medium-speed coal mill are very easy to occur, on one hand, the medium-speed coal mill can be directly shut down under the condition of low load, the power consumption is saved, and the safety is improved; on the other hand, the pulverized coal concentration of primary air entering the boiler is ensured, the combustion stability and the burnout property of the pulverized coal in the boiler are ensured, the exhaust gas temperature is reduced, and the boiler efficiency is improved; the economy of the unit is improved.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:
FIG. 1 is a schematic diagram of the overall principle of the present utility model;
FIG. 2 is a schematic diagram of the operation of the utility model when the bypass hot blast valve and the bypass primary air valve are closed, and the overgrinding hot blast valve, the bypass powder air valve, the main powder air valve and the tertiary air valve are opened;
FIG. 3 is a schematic diagram of the operation of the utility model when the bypass hot blast valve, the bypass primary blast valve, the bypass dust blast valve and the tertiary blast valve are closed, and the overgrinding hot blast valve and the main dust blast valve are opened;
in the figure: 1. an air preheater; 2. a medium speed coal mill; 3. a boiler; 4. a fines separator; 5. a powder feeder; 6. a powder bin; 7. overgrinding the hot air valve; 8. a bypass hot blast valve; 9. bypass with powder air valve; 10. a main road with a powder air valve; 11. a tertiary air valve; 12. a bypass primary air valve; 13. hot air; 14. overgrinding hot air; 15. bypass hot air; 16. carrying out powder wind; 17. main road with powder wind; 18. bypass with powder wind; 19. tertiary air; 20. a primary air pipeline for feeding into the furnace; 21. a coal powder pipeline.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
1-3, the coal-fired boiler unit comprises an air preheater 1, a medium speed coal mill 2, a boiler 3, a fine powder separator 4, a powder feeder 5 and a powder bin 6, wherein the air preheater 1 is communicated with the boiler 3 through the medium speed coal mill 2 and the powder feeder 5 respectively, the medium speed air mill 2 is communicated with the fine powder separator 4, the fine powder separator 4 is communicated with the powder bin 6, and the powder bin 6 is communicated with the powder feeder 5; the hot air 13 at the outlet of the air preheater 1 is divided into overgrinding hot air 14 and bypass hot air 15, the pipeline of the overgrinding hot air 14 is communicated with the air medium-speed coal mill 2 through an overgrinding hot air valve 7, and the pipeline of the bypass hot air 15 is communicated with the powder feeder 5 through a bypass hot air valve 8; the pulverized coal carrying air 16 at the outlet of the medium speed coal mill 2 is divided into a main pulverized coal carrying air 17 and a bypass pulverized coal carrying air 18, wherein a main pulverized coal carrying air 17 pipeline is communicated with the boiler 3 through a main pulverized coal carrying air valve 10, and a bypass pulverized coal carrying air 18 pipeline is communicated with the fine powder separator 4 through a bypass pulverized coal carrying air valve 9; a tertiary air 19 pipeline at the top of the fine powder separator 4 is communicated with a main path powder carrying air 17 pipeline, and a tertiary air valve 11 is arranged on the tertiary air 19 pipeline; the pulverized coal pipeline 21 at the bottom of the fine powder separator 4 is communicated with the powder bin 6; the primary air inlet pipeline 20 at the outlet of the powder feeder 5 is communicated with the boiler 3 through a bypass primary air valve 12.
The whole working principle of the utility model is as follows: by arranging the air preheater 1, the medium speed coal mill 2, the boiler 3, the fine powder separator 4, the powder feeder 5 and the powder bin 6, when the load of the boiler 3 is higher, the bypass hot air valve 8 and the bypass primary air valve 12 are closed, and the overgrinding hot air valve 7, the bypass powder air valve 9, the main path powder air valve 10 and the tertiary air valve 11 are opened; at the moment, all hot air 13 at the outlet of the air preheater 1 enters the medium speed coal mill 2 to dry raw coal in a mode of overgrinding hot air 14; the pulverized air 16 at the outlet of the medium speed coal mill 2 is divided into a main path pulverized air 17 and a bypass pulverized air 18, the bypass pulverized air 18 enters the fine powder separator 4 to perform air-powder separation, separated pulverized coal is stored in the powder bin 6, and separated tertiary air 19 is mixed with the main path pulverized air 17 and then is used as primary air entering a boiler to be sent to the boiler 3 for combustion; when the powder level of the pulverized coal in the powder bin 6 reaches a certain requirement, the bypass powder carrying air valve 9 and the tertiary air valve 11 are closed, and all the powder carrying air at the outlet of the medium-speed coal mill 2 enters the boiler 3 for combustion in a main path powder carrying air 17 mode; when the load of the boiler 3 is reduced to below 30%, the hot air 13 at the outlet of the air preheater 1 is divided into two parts of overgrinding hot air 14 and bypass hot air 15, the overgrinding hot air 14 enters a medium-speed coal mill to dry raw coal, and the bypass hot air 15 is used as powder feeding air; the bypass hot air 15 is connected with the powder feeder 5, and the bypass powder-carrying air 18 stops running; the bypass hot air 15 carries the pulverized coal stored in the powder bin 6 at the powder feeder 5 to be changed into primary air which enters the furnace and is sent to the boiler 3 for combustion; the overgrinding hot air valve 7, the bypass powder-carrying air valve 9, the main path powder-carrying air valve 10 and the tertiary air valve 11 are closed when the boiler load is lower than a certain value; the bypass hot air valve 8 and the bypass primary air valve 12 are opened when the boiler load is lower than a certain value, and the bypass hot air 15 carries pulverized coal as primary air entering the boiler for combustion under the action of the powder feeder 5; aiming at the problems that when the flexibility of the boiler reduces the load, the medium-speed coal mill needs to reduce the output operation, and the vibration and the large current fluctuation of the medium-speed coal mill are very easy to occur, on one hand, the medium-speed coal mill can be directly shut down under the condition of low load, the power consumption is saved, and the safety is improved; on the other hand, the pulverized coal concentration of primary air entering the boiler is ensured, the combustion stability and the burnout property of the pulverized coal in the boiler are ensured, the exhaust gas temperature is reduced, and the boiler efficiency is improved; the economy of the unit is improved.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (6)
1. The utility model provides a coal-fired pot unit, includes air heater (1), medium speed coal pulverizer (2), boiler (3), fine powder separator (4), give powder machine (5), powder storehouse (6), its characterized in that: the air preheater (1) is communicated with the boiler (3) through the medium speed coal mill (2) and the powder feeder (5) respectively, the medium speed coal mill (2) is communicated with the fine powder separator (4), the fine powder separator (4) is communicated with the powder bin (6), and the powder bin (6) is communicated with the powder feeder (5).
2. The coal-fired boiler unit according to claim 1, wherein: the hot air (13) at the outlet of the air preheater (1) is divided into overgrinding hot air (14) and bypass hot air (15), the pipeline of the overgrinding hot air (14) is communicated with the air medium-speed coal mill (2) through an overgrinding hot air valve (7), and the pipeline of the bypass hot air (15) is communicated with the powder feeder (5) through a bypass hot air valve (8).
3. The coal-fired boiler unit according to claim 1, wherein: the powder-carrying air (16) at the outlet of the medium-speed coal mill (2) is divided into a main-path powder-carrying air (17) and a bypass powder-carrying air (18), wherein a main-path powder-carrying air (17) pipeline is communicated with the boiler (3) through a main-path powder-carrying air valve (10), and a bypass powder-carrying air (18) pipeline is communicated with the fine powder separator (4) through a bypass powder-carrying air valve (9).
4. A coal-fired boiler unit according to claim 3, characterized in that: and a tertiary air (19) pipeline at the top of the fine powder separator (4) is communicated with a main-path powder carrying air (17), and a tertiary air valve (11) is arranged on the tertiary air (19) pipeline.
5. The coal-fired boiler unit according to claim 1, wherein: the pulverized coal pipeline (21) at the bottom of the fine powder separator (4) is communicated with the powder bin (6).
6. The coal-fired boiler unit according to claim 1, wherein: the primary air inlet pipeline (20) of the outlet of the powder feeder (5) is communicated with the boiler (3) through a bypass primary air valve (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223452699.4U CN219014362U (en) | 2022-12-23 | 2022-12-23 | Coal-fired boiler unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223452699.4U CN219014362U (en) | 2022-12-23 | 2022-12-23 | Coal-fired boiler unit |
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| Publication Number | Publication Date |
|---|---|
| CN219014362U true CN219014362U (en) | 2023-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223452699.4U Active CN219014362U (en) | 2022-12-23 | 2022-12-23 | Coal-fired boiler unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219014362U (en) |
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2022
- 2022-12-23 CN CN202223452699.4U patent/CN219014362U/en active Active
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