CN216644258U - System for preventing and controlling high-alkali coal boiler slagging contamination - Google Patents
System for preventing and controlling high-alkali coal boiler slagging contamination Download PDFInfo
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- CN216644258U CN216644258U CN202220219223.7U CN202220219223U CN216644258U CN 216644258 U CN216644258 U CN 216644258U CN 202220219223 U CN202220219223 U CN 202220219223U CN 216644258 U CN216644258 U CN 216644258U
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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 relates to the technical field of power station boiler additives, in particular to a system for preventing and controlling slagging contamination of a high-alkali coal boiler. The utility model has simple system, small equipment modification, small influence on the original system of the boiler and no need of raw material cost; the superfine vanadium stone coal tailings adopted by the utility model have good slag bonding prevention and contamination prevention effects, the running safety of the high-alkali coal boiler is improved, and the abrasion to equipment is small.
Description
Technical Field
The utility model relates to the technical field of power station boiler additives, in particular to a system for preventing and controlling slagging and contamination of a high-alkali coal boiler.
Background
The high-alkali coal in the east China is easy to catch fire and burn out, has low sulfur content, and is environment-friendly coal for power. Compared with other domestic serious slagging coal types, Na in the high-alkali coal ash2O、CaO、Fe2O3High content of basic oxides such as MgO, and SiO2And Al2O3When the content of acidic oxides is low, the problems of serious furnace slag formation and serious contamination of convection heating surfaces easily occur when high-alkali coal is used for boiler combustion, and most of the units need to ensure the safe operation of the units by blending additives such as low-sodium coal or kaolin and the like.
Because the high-alkali coal has large reserve, the low-sodium coal has small amount and high price, and the kaolin addition proportion is high, the load capacity of a unit is restricted, and the purchase of the kaolin can increase the power generation cost.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model aims to provide a system for preventing and controlling slagging contamination of a high-alkali coal boiler, which can simultaneously solve the problems of preventing and controlling slagging contamination of high-alkali coal and environmental protection treatment of tailings of vanadium stone-extracting coal.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a system for preventing and controlling slagging contamination of a high-alkali coal boiler comprises a primary air main pipe 2, an air quantity adjusting device 3, a powder bin 1, a powder feeder 4, an air-powder distributor 5, a high-alkali coal raw coal bin 6, a coal dropping pipe 7, a coal mill 8, a combustor 10, a hearth 9 and a pipeline; the air quantity adjusting device 3 is arranged on a powder feeding air bypass pipeline led out from the primary air main pipe 2, the downstream of the air quantity adjusting device 3 is connected with a powder feeder 4, the inlet of the powder feeder 4 is connected with a powder bin 1, the powder bin 1 is filled with the tailings powder of the vanadium stone coal, the outlet of the powder feeder 4 is connected with an air powder distributor 5, and the tailings powder of the vanadium stone coal is carried by the air quantity from the primary air main pipe 2 and enters the air powder distributor 5; the air powder distributor 5 is provided with a plurality of outlets, the outlets are correspondingly connected with coal dropping pipes 7 of all the coal mills one by one, and the inlets of the coal dropping pipes 7 are also connected with high-alkali coal raw coal bins 6; the outlets of the coal mills 8 are correspondingly connected with the plurality of burners 10 on the hearth 9 one by one, and the tailings powder of the extracted vanadium stone coal and the high-alkali coal are mixed in the coal mills 8, fired in the burners 10 and then enter the hearth 9 for mixed combustion.
The base ash A of the tailings powder of the vanadium stone extraction coalar>70% total moisture Mt<10% coal ash softening temperature ST>1500 ℃, the fineness of the coal powder is less than 30 mu m, and SiO is contained in the ash2＝60～90％、Al2O3>5％、Fe2O3<3％、CaO<4％、MgO<1％、Na2O<1.0％、K2O<1.0％。
The primary air main pipe 2 is a cold primary air main pipe or a hot primary air main pipe of the boiler.
According to the working method of the system for preventing and controlling the slagging and contamination of the high alkali coal boiler, the air volume from the primary air main pipe 2 carries a certain amount of the tailings powder of the vanadium stone-extracted coal into the air powder distributor 5, wherein the tailings powder of the vanadium stone-extracted coal comes from the powder bin 1, the powder amount of the tailings powder of the vanadium stone-extracted coal is controlled by the powder feeder 4, the air volume carrying the tailings powder of the vanadium stone-extracted coal is regulated and controlled by the air volume regulating device 3, finally, the mixture of the tailings powder of the air/vanadium stone-extracted coal meeting the required concentration and the high alkali coal in the high alkali coal raw coal bin 6 simultaneously enter the coal dropping pipe 7 and then enter the coal mill 8 for grinding and mixing, and the mixed powder sample of the high alkali coal raw coal and the tailings powder of the vanadium stone coal-extracted coal enters the combustor 10 for ignition and then enters the hearth 9 for combustion.
The total feeding rate of the tailings powder of the vanadium stone extraction coal is 2-8% of the total coal feeding rate of the boiler hearth.
The ratio of the air quantity carrying the tailings powder of the vanadium stone extraction coal to the tailings powder quantity of the vanadium stone extraction coal is (1.6-1.8): 1.
the system and the method have the advantages that:
the utility model can simultaneously solve the problems of prevention and control of slag formation and contamination of the high-alkali coal and the problem of environment-friendly treatment of tailings of the vanadium stone coal; the system is simple, the equipment transformation is small, the influence on the original system of the boiler is small, only a powder feeding system for extracting the vanadium stone coal tailings needs to be added, and a primary air main pipe is selected as an air source, so that the pressure head requirement of the system can be ensured. And thirdly, the coal quality requirement of the tailings of the vanadium stone coal ensures the effectiveness of the tailings as anti-slagging and anti-contamination additives of the high-alkali coal. And fourthly, the superfine tailings of the vanadium stone extraction coal are used as an anti-slagging and anti-contamination additive of the high-alkali coal, so that the tailings powder sample of the vanadium stone extraction coal can be promoted to fully react with the high-alkali coal in the combustion process, and the optimal anti-slagging and anti-contamination effects are achieved. And fifthly, because the hardness of the tailings of the vanadium stone extraction coal is higher and the abrasion is stronger, the adoption of superfine coal powder and the qualified ratio of wind to the tailings of the vanadium stone extraction coal can slow down the abrasion to related equipment. And sixthly, the uniform distribution of the tailings powder of the vanadium stone coal can be ensured in each coal mill by adopting a wind powder distributor. And the blending proportion of the additive can be adjusted in real time according to the slagging condition of the boiler, so that the effect of the additive is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a method and an additive system for preventing and controlling slagging contamination of a high-alkali coal boiler.
Wherein, 1 is a powder bin, 2 is a primary air main pipe, 3 is an air quantity adjusting device, 4 is a powder feeder, 5 is an air powder distributor, 6 is a high-alkali coal raw coal bin, 7 is a coal dropping pipe, 8 is a coal mill, 9 is a hearth, and 10 is a burner.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings:
referring to FIG. 1, the utility model relates to a system for preventing and controlling slag bonding and contamination of a high-alkali coal boilerThe work flow of the system is as follows: the air quantity from the primary air main pipe 2 carries a certain amount of the tailings powder of the vanadium stone extraction coal into an air powder distributor 5, wherein the tailings powder of the vanadium stone extraction coal comes from a powder bin 1 (the tailings powder of the vanadium stone extraction coal is required to be superfine coal powder with the fineness of less than 30 mu m, and the coal quality of the tailings of the vanadium stone extraction coal is required to be that basic ash A is receivedar>70% total moisture Mt<10% coal ash softening temperature ST>1500 ℃ in ash SiO2＝60-90％、Al2O3>5％、Fe2O3<3％、CaO<4％、MgO<1％、Na2O<1.0％、K2O<1.0%), the powder amount of the tailings powder of the extracted vanadium stone coal is controlled by a powder feeder 4, the air volume carrying the tailings powder of the extracted vanadium stone coal is regulated and controlled by an air volume regulating device 3, and finally the mixture of the air/the tailings powder of the extracted vanadium stone coal with qualified concentration (the air-powder ratio, namely the ratio of the air volume carrying the tailings powder of the stone coal to the powder amount of the tailings powder of the stone coal is 1.6-1.8: 1) and high-alkali coal raw coal in a high-alkali coal raw coal bunker 6 enters a coal dropping pipe 7 at the same time, then enters a coal mill 8 for grinding and mixing, and the high-alkali coal raw coal and stone coal vanadium extraction tailings powder mixed powder sample enters a combustor 10 for ignition and then enters a hearth 9 for combustion.
The total feeding rate of the vanadium extraction stone coal tailing powder is 2-8% of the total coal feeding rate of a boiler furnace, so that the problems of slagging and contamination of a high-alkali coal boiler can be solved by blending and burning a small amount of stone coal tailings, and the influence on the boiler efficiency is small.
The system for preventing and controlling the slagging and contamination of the high-alkali coal boiler can greatly relieve the slagging and contamination performance of the high-alkali coal and improve the safety of the boiler operation.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The utility model provides a system for preventing and controlling high alkali coal boiler slagging scorification stains which characterized in that: the device comprises a primary air main pipe (2), an air quantity adjusting device (3), a powder bin (1), a powder feeder (4), an air-powder distributor (5), a high-alkali coal raw coal bin (6), a coal dropping pipe (7), a coal mill (8), a burner (10), a hearth (9) and a pipeline; the air volume adjusting device (3) is arranged on a powder feeding air bypass pipeline led out from the primary air main pipe (2), the downstream of the air volume adjusting device (3) is connected with a powder feeder (4), the inlet of the powder feeder (4) is connected with a powder bin (1), the powder bin (1) is filled with the tailings powder of the vanadium stone coal, the outlet of the powder feeder (4) is connected with an air powder distributor (5), and the tailings powder of the vanadium stone coal is carried by the air volume from the primary air main pipe (2) and enters the air powder distributor (5); the air-powder distributor (5) is provided with a plurality of outlets, the outlets are correspondingly connected with coal dropping pipes (7) of all the coal mills one by one, and the inlets of the coal dropping pipes (7) are also connected with a high-alkali coal raw coal bin (6); outlets of all the coal mills (8) are correspondingly connected with a plurality of burners (10) on the hearth (9) one by one, and the tailings powder of the extracted vanadium stone coal and the high-alkali coal are mixed in the coal mills (8), fired in the burners (10) and then enter the hearth (9) for mixed combustion.
2. The system for preventing and controlling the slagging contamination of the high alkali coal boiler according to claim 1, wherein: the primary air main pipe (2) is a cold primary air main pipe or a hot primary air main pipe of a boiler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220219223.7U CN216644258U (en) | 2022-01-26 | 2022-01-26 | System for preventing and controlling high-alkali coal boiler slagging contamination |
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| CN202220219223.7U CN216644258U (en) | 2022-01-26 | 2022-01-26 | System for preventing and controlling high-alkali coal boiler slagging contamination |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263926A (en) * | 2022-01-26 | 2022-04-01 | 西安热工研究院有限公司 | System and method for preventing and controlling slag bonding and contamination of high-alkali coal boiler |
| CN115342341A (en) * | 2022-08-10 | 2022-11-15 | 西安热工研究院有限公司 | System and method for improving deep peak shaving capacity of pulverized coal fired boiler |
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- 2022-01-26 CN CN202220219223.7U patent/CN216644258U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263926A (en) * | 2022-01-26 | 2022-04-01 | 西安热工研究院有限公司 | System and method for preventing and controlling slag bonding and contamination of high-alkali coal boiler |
| CN114263926B (en) * | 2022-01-26 | 2024-04-02 | 西安热工研究院有限公司 | System and method for preventing and controlling slag formation and contamination of high-alkali coal boiler |
| CN115342341A (en) * | 2022-08-10 | 2022-11-15 | 西安热工研究院有限公司 | System and method for improving deep peak shaving capacity of pulverized coal fired boiler |
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