CN113819479A - A system and method for increasing the drying output of a medium-speed coal mill based on high-temperature furnace smoke - Google Patents
A system and method for increasing the drying output of a medium-speed coal mill based on high-temperature furnace smoke Download PDFInfo
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- CN113819479A CN113819479A CN202111285020.4A CN202111285020A CN113819479A CN 113819479 A CN113819479 A CN 113819479A CN 202111285020 A CN202111285020 A CN 202111285020A CN 113819479 A CN113819479 A CN 113819479A
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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
- F23K1/04—Heating fuel prior to delivery to combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
- F26B21/001—Air generating units, e.g. movable or independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
- F26B21/30—Controlling, e.g. regulating, parameters of gas supply
- F26B21/35—Temperature; Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
- F26B21/30—Controlling, e.g. regulating, parameters of gas supply
- F26B21/37—Velocity of flow; Quantity of flow
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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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
本发明公开了一种基于抽高温炉烟提升中速磨煤机干燥出力的系统及方法，包括煤粉锅炉，所述煤粉锅炉在冷灰斗区域两侧墙各布置一个高温炉烟抽烟口，高温炉烟抽烟口通过高温炉烟管道、中温炉烟管道与炉烟增压风机相连；所述高温炉烟管道通过热一次风旁路管道与上游热一次风管道连接，所述上游热一次风管道上开设抽风口；所述炉烟增压风机出口烟道与下游热一次风管道通过混合结构相连，所述下游热一次风管道末端连接磨煤机。本发明采用抽高温炉烟技术和热一次风旁路技术，将磨煤机进口干燥介质温度提高至约400℃，干燥介质含氧量可降低至约15％，高温炉烟抽取量较少，现场布置紧凑；无烟气再循环，受热面传热特性、磨损、锅炉效率、引风机电耗等影响较小。
The invention discloses a system and method for increasing the drying output of a medium-speed coal pulverizer based on high-temperature furnace smoke extraction. , the high-temperature furnace smoke exhaust port is connected with the furnace smoke booster fan through the high-temperature furnace smoke pipeline and the medium-temperature furnace smoke pipeline; the high-temperature furnace smoke pipeline is connected with the upstream hot primary air pipeline through the hot primary air bypass pipeline, and the upstream hot primary air pipeline The air duct is provided with an air outlet; the outlet flue of the furnace smoke booster fan is connected with the downstream hot primary air duct through a mixing structure, and the end of the downstream hot primary air duct is connected to the coal mill. The invention adopts the high-temperature furnace smoke extraction technology and the hot primary air bypass technology to increase the temperature of the drying medium at the inlet of the coal mill to about 400°C, the oxygen content of the drying medium can be reduced to about 15%, and the high-temperature furnace smoke extraction is less. The site layout is compact; there is no flue gas recirculation, and it is less affected by the heat transfer characteristics of the heating surface, wear, boiler efficiency, and power consumption of the induced draft fan.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a system and a method for improving the drying output of a medium-speed coal mill based on high-temperature smoke extraction.
Background
The boiler of the power station in China generally has the problem of coal blending combustion, and part of boilers have severe coal sources and even need to perform coal blending combustion and even reforming combustion in a large proportion and across coal types, so that the drastic change of the operation condition is brought about by the great change of the coal types, and higher requirements are put forward on the adaptability of the boiler and auxiliary machines thereof. The boiler with the coal type being bituminous coal is designed to have the following problems when high-moisture lignite and coal slime are mixed and burnt: (a) when the lignite with high moisture content and high volatile content is burned or blended, the coal pulverizing system cannot normally operate and serious safety risks are derived, the requirements cannot be met only by operation adjustment, and the wide coal type adaptability transformation must be carried out on the boiler coal pulverizing system, the combustion system and the like; (b) the method can greatly improve the drying output of a powder making system and reduce the oxygen content of a drying medium by pumping high-temperature furnace smoke, high-temperature and low-pressure furnace smoke is boosted by a furnace smoke fan and then introduced into a hot primary air main pipe, the current furnace smoke pumping drying technology is mainly based on a fan coal mill and a storage type powder making system in a steel ball coal mill, and the fan coal mill and the steel ball coal mill are both difficult to improve a furnace smoke pressure head to a higher level.
The key points of the furnace smoke pumping scheme for the direct-blowing pulverizing system of the medium-speed coal mill are the resistance of the furnace smoke system, the temperature of a drying medium at the inlet of the coal mill and the performance of a furnace smoke fan. If the resistance of the furnace smoke system is small, the smoke volume can be ensured, and the adjustment margin of the powder making system is large; if the resistance of the furnace smoke system is large, only a small amount of hot smoke can be sucked, and the drying output improving effect is not obvious. If the primary temperature of the drying medium is too high, parts such as the inner bearing of the medium-speed coal mill face failure risks, and later-stage maintenance cost is improved more. Therefore, the initial temperature of the drying medium at the inlet of the coal mill needs to be controlled below 400 ℃. Because medium speed pulverizer blows formula powder process system directly, the pressure of the female pipe of hot primary air is higher, and the smoke fan that takes out the stove cigarette needs to improve the pressure of the cold, the hot mixed stove cigarette of little negative pressure to a little more than the pressure of the female pipe of hot primary air.
Aiming at a direct-fired pulverizing system of a medium-speed coal mill, the existing furnace smoke extracting three-medium drying scheme adopts cold ash bucket hot furnace smoke, low-temperature furnace smoke at an outlet of a draught fan and hot primary air. The furnace smoke pumping system is divided into a hot furnace smoke pipeline system, a cold furnace smoke pipeline system and a mixed pressurization pipeline system. The hot furnace smoke pipeline system is used for extracting smoke with the temperature of about 850-900 ℃ between the combustor and the cold ash hopper, the oxygen content of the hot furnace smoke is lower and is about 3-4 percent, the hot furnace smoke is used as a high-temperature drying medium of the powder making system, the high-temperature flue stroke is shortest, the resistance is minimum, and the furnace smoke extraction amount is convenient to adjust. The cold furnace smoke pipeline system extracts smoke with the temperature of about 125 ℃ from an outlet of a draught fan, leads the smoke to an inlet of the hot furnace smoke, and arranges a mixing point as close as possible to a smoke outlet of the hot furnace so as to mix the cold and hot furnace smoke as early as possible and prevent the problems of difficult heat preservation, slag adhering inside and the like caused by overlong smoke pipe sections of the hot furnace; the mixed pressurization pipeline system is characterized in that high-temperature furnace smoke and low-temperature furnace smoke enter a cold and hot smoke mixing pipeline together, the temperature of the mixed smoke is not more than 450 ℃, the mixed smoke enters a furnace smoke fan, the mixed smoke is boosted by the furnace smoke fan to enter a downstream hot primary air main pipe, and the temperature of a drying medium at an inlet of a coal mill is not more than 400 ℃. The low-temperature flue gas mainly has the function of adjusting the temperature of the high-temperature flue gas, so that the flue gas fan can work normally.
This solution has the following drawbacks: (a) more low-temperature cooling furnace smoke needs to be introduced, so that the quality of the smoke is reduced; (b) the arrangement investment of the low-temperature cooling furnace smoke pipeline is large; (c) the hot furnace smoke extraction amount is large, which is not beneficial to the combustion stability of the main combustion area; (d) because more cooling furnace smoke is introduced, the smoke quantity from the boiler to the flue at the outlet of the induced draft fan is increased more, the radiation heat exchange quantity and the convection heat exchange quantity of the boiler are changed greatly, and the heat transfer characteristic of each stage of heating surface is changed greatly; (e) the abrasion of each stage of heating surface is intensified, and as the smoke amount and the smoke exhaust temperature rise, the smoke resistance and the wind resistance are increased, the power consumption of a draught fan is increased, and the efficiency of the electrostatic dust collector is reduced; (f) the boiler efficiency is reduced.
Disclosure of Invention
In order to overcome the technical problems, the invention provides a system and a method for improving the drying output of a medium-speed coal mill based on high-temperature furnace smoke extraction, wherein a bypass air channel is arranged on a hot primary air main pipe at the outlet of an air preheater to lead out partial hot primary air to be mixed with high-temperature furnace smoke, the temperature of the furnace smoke is adjusted to about 450 ℃, and the normal work of a furnace smoke fan is ensured. After temperature adjustment, the medium-temperature furnace smoke enters a downstream hot primary air main pipe after being boosted by a furnace smoke booster fan, and the temperature of a drying medium at the inlet of a coal mill is increased by about 400 ℃. The scheme adopts a high-temperature furnace smoke extraction technology and a hot primary air bypass technology, reduces the extraction amount of the high-temperature furnace smoke, and is compact in field arrangement; the scheme has no flue gas recirculation, and the influence of heat transfer characteristics of the heating surface, abrasion, boiler efficiency, power consumption of the induced draft fan and the like is relatively small.
In order to achieve the purpose, the invention adopts the technical scheme that:
a system for improving the drying output of a medium-speed coal mill based on high-temperature furnace smoke extraction comprises a pulverized coal boiler 1, wherein a high-temperature furnace smoke extraction port 3 is respectively arranged on two side walls of a cold ash bucket area 2 of the pulverized coal boiler 1, and the high-temperature furnace smoke extraction port 3 is connected with a furnace smoke booster fan 6 through a high-temperature furnace smoke pipeline 4 and a medium-temperature furnace smoke pipeline 5;
the high-temperature furnace smoke pipeline 4 is connected with an upstream hot primary air pipeline 7 through a hot primary air bypass pipeline 8;
an outlet flue of the furnace smoke booster fan 6 is connected with a downstream hot primary air pipeline 9 through a mixing structure 12, and the tail end of the downstream hot primary air pipeline 9 is connected with a coal mill 14.
The hot primary air bypass pipeline 8 is provided with a bypass air flow control valve 11, and the medium temperature furnace flue pipe 5 is provided with a furnace flue gas flow control valve 13.
The hot primary air bypass pipeline 8 is used for reducing the temperature of the high-temperature furnace smoke in the high-temperature furnace smoke pipeline 4 to about 450 ℃ to form medium-temperature furnace smoke.
The fume booster fan 6 is used to raise the medium temperature fume head to slightly above the medium pressure in the downstream hot primary air duct 9.
And an air suction opening 10 is formed in the upstream hot primary air pipeline 7.
A use method of a system for improving the drying output of a medium-speed coal mill based on high-temperature smoke extraction comprises the following steps;
extracting high-temperature furnace smoke with the temperature of about 850 ℃ from two side walls of a cold ash hopper area 2 of the pulverized coal boiler 1; part of hot air is extracted from an upstream hot primary air pipeline 7 and is introduced into a high-temperature furnace smoke pipeline 4 through a hot primary air bypass pipeline 8, the temperature of the high-temperature furnace smoke is reduced to about 450 ℃, and medium-temperature furnace smoke is formed;
the medium temperature furnace smoke improves the pressure head through the furnace smoke booster fan 6 and then flows into the downstream hot primary air pipeline 9, and the temperature of the grinding drying medium is improved to about 400 ℃ by introducing a proper amount of high temperature furnace smoke, so that the drying output of the powder making system can be greatly improved; because the inert furnace smoke is introduced, the oxygen content of the drying medium can be reduced to about 15 percent, the possibility of deflagration in the drying and grinding process of the high-volatile lignite is reduced, and the safety is improved;
the bypass air flow control valve 11 arranged on the hot primary air bypass pipeline 8 is used for adjusting the bypass hot primary air flow so as to control the temperature of the medium-temperature furnace smoke; the high-temperature furnace smoke extraction amount is controlled by a furnace smoke flow control valve 13 arranged on the medium-temperature furnace smoke pipeline 5, so that the initial temperature of the drying medium at the inlet of the coal mill is effectively controlled.
The invention has the beneficial effects that:
1. the technology does not need to introduce low-temperature cold furnace smoke, the investment of a furnace smoke pipeline is small, and the transformation range is relatively concentrated;
2. because the high-temperature furnace smoke is led out from the ash bucket area and is led into the hearth again from the combustor area, the smoke volume of the boiler is not changed greatly, and the radiation heat exchange quantity and the convection heat exchange quantity of the boiler are not changed greatly;
3. compared with a three-medium drying technology, the high-temperature furnace smoke extraction device has the advantages that the high-temperature furnace smoke extraction amount is less, and the influence on a main combustion area of a boiler is less.
4. The abrasion of the heating surface is not increased, the change of the smoke volume and the smoke exhaust temperature is not large, the boiler efficiency is not influenced, and the power consumption of the induced draft fan is not increased.
Drawings
Fig. 1 is a schematic elevation view of the present invention.
Fig. 2 is a schematic plan view of the present invention.
Description of reference numerals:
1 is a pulverized coal boiler; 2 is a cold ash bucket area; 3 is a high-temperature furnace smoke exhaust port; 4 is a high-temperature furnace smoke pipeline; 5 is a medium temperature furnace smoke pipeline; 6 is a furnace smoke booster fan; 7 is an upstream hot primary air pipeline; 8 is a hot primary air bypass pipeline; 9 is a downstream hot primary air pipeline; 10 is an air suction opening; 11 is a bypass air flow control valve; 12 is a mixed structure; 13 is a smoke flow control valve; and 14 is a coal mill.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, the system for improving the drying output of the medium speed coal mill based on high temperature smoke extraction mainly comprises a pulverized coal boiler 1; a cold ash hopper area 2; a high temperature furnace smoke exhaust port 3; a high temperature furnace flue pipe 4; a medium temperature furnace flue pipe 5; a flue gas booster fan 6; an upstream hot primary air duct 7; a hot primary air bypass duct 8; a downstream hot primary air duct 9.
When the high-temperature furnace smoke is pumped to improve the drying output of the medium-speed coal mill, low-temperature hot primary air and high-temperature furnace smoke are mixed through a hot primary air bypass technology to obtain medium-temperature furnace smoke with moderate temperature, and a pressure head is lifted through a furnace smoke booster fan and then introduced into a downstream hot primary air pipeline through a mixing structure;
the high-temperature furnace smoke extraction quantity is adjusted through the furnace smoke flow control valve, and the temperature of the medium at the inlet of the furnace smoke fan is controlled through the bypass air flow control valve.
The specific implementation process comprises the following steps:
extracting high-temperature furnace smoke with the temperature of about 850 ℃ from two side walls of a cold ash hopper area 2 of the pulverized coal boiler 1; part of hot air is extracted from an upstream hot primary air pipeline 7 through a hot primary air bypass pipeline 8 and is introduced into a high-temperature furnace smoke pipeline 4, the temperature of the high-temperature furnace smoke is reduced to about 450 ℃, and medium-temperature furnace smoke is formed; the medium temperature furnace smoke is converged into a downstream hot primary air pipeline 9 after the pressure head is improved by a furnace smoke booster fan 6.
The temperature of the drying medium at the inlet of the coal mill is increased to about 400 ℃ by introducing a proper amount of high-temperature furnace smoke, so that the drying output of a pulverizing system can be greatly improved; because the inert furnace smoke is introduced, the oxygen content of the drying medium can be reduced to about 15 percent, the possibility of deflagration in the drying and grinding process of the high-volatile lignite is reduced, and the safety is improved. The amount of the bypass hot primary air is adjusted through a flow control valve 11 arranged on a hot primary air bypass pipeline 8, so that the temperature of a medium entering a furnace smoke booster fan is controlled; the flow control valve 13 arranged on the medium temperature furnace smoke pipeline 5 controls the smoke extraction amount of the high temperature furnace, and effectively controls the initial temperature of the drying medium at the inlet of the coal mill.
In the specific implementation process of the invention, the furnace smoke fan blade, the high-temperature furnace smoke pipeline, the medium-temperature furnace smoke pipeline and the downstream hot primary air pipeline need to adopt relevant anti-abrasion measures.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
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Cited By (4)
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| CN114669389A (en) * | 2022-03-01 | 2022-06-28 | 苏州西热节能环保技术有限公司 | Coal mill primary air pressure control method, device, storage medium and electronic equipment |
| 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 |
| CN114754832A (en) * | 2022-04-12 | 2022-07-15 | 西安热工研究院有限公司 | Method and system for measuring primary air flow at inlet of coal mill |
| CN117231999A (en) * | 2023-09-14 | 2023-12-15 | 西安热工研究院有限公司 | A kind of pulverized coal drying system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114669389A (en) * | 2022-03-01 | 2022-06-28 | 苏州西热节能环保技术有限公司 | Coal mill primary air pressure control method, device, storage medium and electronic equipment |
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| CN114754832A (en) * | 2022-04-12 | 2022-07-15 | 西安热工研究院有限公司 | Method and system for measuring primary air flow at inlet of coal mill |
| 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 |
| CN117231999A (en) * | 2023-09-14 | 2023-12-15 | 西安热工研究院有限公司 | A kind of pulverized coal drying system |
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