CN203771438U - High-moisture lignite medium speed mill coal pulverizing system using coal gas combustion heating primary air - Google Patents

High-moisture lignite medium speed mill coal pulverizing system using coal gas combustion heating primary air Download PDF

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Publication number
CN203771438U
CN203771438U CN201420164140.8U CN201420164140U CN203771438U CN 203771438 U CN203771438 U CN 203771438U CN 201420164140 U CN201420164140 U CN 201420164140U CN 203771438 U CN203771438 U CN 203771438U
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China
Prior art keywords
gas
primary air
medium
coal
speed pulverizer
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Withdrawn - After Issue
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CN201420164140.8U
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Chinese (zh)
Inventor
白少林
敬小磊
晋中华
杨培军
赵卫东
范庆伟
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Boiler Environmental Protection Engineering Co Ltd
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Thermal Power Research Institute
Xian Xire Boiler Environmental Protection Engineering Co Ltd
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Priority to CN201420164140.8U priority Critical patent/CN203771438U/en
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Abstract

The utility model discloses a high-moisture lignite medium speed mill coal pulverizing system using coal gas combustion heating primary air. The high-moisture lignite medium speed mill coal pulverizing system comprises a medium speed mill, a coal gas producer, a fan, a high-temperature flue gas producer, a primary air fan, a coal feeder and an air preheater, and can complete drying of high-moisture lignite. According to the high-moisture lignite medium speed mill coal pulverizing system using the coal gas combustion heating primary air, part of boiler heat primary air and coal gas produced by the coal gas producer are guided into the high-temperature flue gas producer to be combusted, hot flue gas produced through combustion is mixed with the remaining heat primary air, the mixture serves as a drying agent and enters the medium speed mill, so that the temperature of the drying agent is increased, and the drying capacity of the lignite boiler coal pulverizing system is improved. The high-moisture lignite medium speed mill coal pulverizing system using the coal gas combustion heating primary air well solves the problem that the drying capacity is insufficient.

Description

Gas-fired adds the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system of heat primary air
Technical field
The utility model belongs to the powder process field of boiler using brown coal, is specifically related to the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system that a kind of gas-fired adds heat primary air.
Background technology
Brown coal are one of China's major impetus coals, account for 18% of thermal coal reserves, are mainly distributed in northeast, Inner Mongol and southwest.The main feature of brown coal is that total moisture is higher, and this is the key factor of boiler using brown coal pulverized coal preparation system type selecting.The difficult problems such as traditional boiler using brown coal is generally equipped with direct feed pulverized coal-fan mill pulverized coal preparation system, selects high-temperature flue gas, hot-air and black furnace cigarette as drying medium, and drying capacity is strong, and impeller shock plate is easy to wear but exist, and maintenance workload is large, maintenance cost height.
The nineties in 20th century, China has introduced the medium-speed pulverizer technology of German BABCOCK company, the successful technology that grinds brown coal obtaining abroad in conjunction with medium-speed pulverizer, while is for the feature of domestic brown coal, through a series of digesting and assimilating, medium-speed pulverizer technology has obtained significant progress in China, has now been widely used in domestic boiler using brown coal, and in actual motion, shows superior performance.Because medium-speed pulverizer unit pulverized-coal system has the features such as system is simple, easy and simple to handle, control is flexible, maintenance workload is less, so applying to large capacity boiler using brown coal, medium-speed pulverizer pulverized coal preparation system becomes the trend of industry development.
Medium-speed pulverizer pulverized coal preparation system is applied to high-moisture boiler using brown coal, and key is whether its drying capacity meets the demands, to evaporate the free moisture of falling into stove raw coal.Drying capacity characterizes with primary air flow and wind-warm syndrome, and wind-warm syndrome and primary air ratio are the key factors that uses the design of boiler using brown coal pulverized coal preparation system.In brief, under the certain prerequisite of heat, a higher wind-warm syndrome can be furnished with relatively little primary air flow, and a lower wind-warm syndrome needs relatively large primary air flow.After the denitrating system of boiler increase at present, be to ensure the safe operation of denitrating system catalyst, General Requirements denitrating system inlet flue gas temperature must not be higher than 420 DEG C, and air preheater outlet hot blast temperature is also thereupon limited.And to improve primary air flow, from the operation actual conditions of current burning high-moisture boiler using brown coal, power plant is for improving pulverized coal preparation system drying capacity, increase primary air flow, primary air velocity has reached 40m/s, even more than, too high primary air velocity can have a negative impact to catching fire and burning of coal dust, the excessive increase of primary air flow simultaneously also means that secondary air flow significantly reduces, and difficulty is brought in the flow field in stove and burning tissue.
Utility model content
The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art, the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system that provides a kind of gas-fired to add heat primary air, and this system can effectively improve the drying capacity of medium-speed pulverizer.
For achieving the above object, the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system that gas-fired described in the utility model adds heat primary air comprises medium-speed pulverizer, gas generator, blower fan, high-temperature flue gas producer, primary air fan, feeder and air preheater, the air outlet of primary air fan is divided into two-way, wherein, one tunnel is connected with the air intake vent of air preheater, and another road is connected with the gas access of medium-speed pulverizer, the gas outlet of air preheater is divided into two-way, wherein a road is connected with the gas access of medium-speed pulverizer, another road is connected with the gas access of blower fan, the gas vent of blower fan is divided into two-way, wherein, one tunnel is connected by the turbulent burner entrance at pipeline Guan Houyu high-temperature flue gas producer top with the gas exit of gas generator, another road is connected with the Secondary Air tangential inlet of high-temperature flue gas producer, the exhanst gas outlet of high-temperature flue gas producer is connected with the gas access of medium-speed pulverizer, the coal-in port of medium-speed pulverizer is connected with the coal outlet of feeder.
Between the air outlet of described primary air fan and the gas access of medium-speed pulverizer, be connected by valve.
The gas outlet of described air preheater is connected by valve with the gas access of medium-speed pulverizer.
The gas vent of described blower fan is connected by valve with the Secondary Air tangential inlet of high-temperature flue gas producer.
The gas vent of described blower fan is connected by valve with the turbulent burner entrance at high-temperature flue gas producer top.
The utlity model has following beneficial effect:
The high-moisture brown coal medium-speed pulverizer pulverized coal preparation system that gas-fired described in the utility model adds heat primary air comprises medium-speed pulverizer, gas generator, blower fan and high-temperature flue gas producer, air preheater produces heat primary air and is divided into two-way, wherein, behind the coal gas interflow that one road heat primary air and gas generator are produced, be incorporated in high-temperature flue gas producer and burn, 1600 DEG C~1800 DEG C hot flue gases that burning produces mix with another road heat primary air, enter medium-speed pulverizer as drier, thereby desiccant temperature is increased to 400 DEG C of left and right, thereby strengthen the drying capacity of high-moisture brown coal.The utility model has solved boiler using brown coal effectively increases the restriction that is subject to denitrating system cigarette temperature after denitrating system, the problem of the not high and pulverized coal preparation system drying capacity deficiency of the heat primary air temperature of the gas outlet output of air preheater.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Wherein, 1 is that feeder, 2 is that medium-speed pulverizer, 3 is that gas generator, 4 is that high-temperature flue gas producer, 5 is that blower fan, 6 is that air preheater, 7 is primary air fan.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail:
With reference to figure 1, the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system that gas-fired described in the utility model adds heat primary air comprises medium-speed pulverizer 2, gas generator 3, blower fan 5, high-temperature flue gas producer 4, primary air fan 7, feeder 1 and air preheater 6, the air outlet of primary air fan 7 is divided into two-way, wherein, one tunnel is connected with the air intake vent of air preheater 6, and another road is connected with the gas access of medium-speed pulverizer 2, the gas outlet of air preheater 6 is divided into two-way, wherein a road is connected with the gas access of medium-speed pulverizer 2, another road is connected with the gas access of blower fan 5, the gas vent of blower fan 5 is divided into two-way, wherein, one tunnel is connected by the turbulent burner entrance at pipeline Guan Houyu high-temperature flue gas producer 4 tops with the gas exit of gas generator 3, another road is connected with the Secondary Air tangential inlet of high-temperature flue gas producer 4, the gas exit of high-temperature flue gas producer 4 is connected with the gas access of medium-speed pulverizer 2, the coal-in port of medium-speed pulverizer 2 is connected with the coal outlet of feeder 1.Between the gas access of the air outlet of primary air fan 7 and medium-speed pulverizer 2, be connected by the first valve, the gas outlet of air preheater 6 is connected by the second valve with the gas access of medium-speed pulverizer 2, the gas vent of blower fan 5 is connected by the 3rd valve with the Secondary Air tangential inlet of high-temperature flue gas producer 4, and the gas vent of blower fan 5 is connected by the 4th valve with the turbulent burner entrance at high-temperature flue gas producer 4 tops.
The course of work of the present utility model is:
The coal gas that described gas generator 3 is produced is introduced high-temperature flue gas producer 4, the a part of heat primary air simultaneously heating through air preheater 6 is divided into two-way through blower fan 5 and enters into high-temperature flue gas producer 4, concrete, lead up to and be arranged in the turbulent burner at high-temperature flue gas producer 4 tops and coal gas participates in burning, one tunnel tangentially enters in high-temperature flue gas producer 4 as Secondary Air, 1600 DEG C~1800 DEG C hot flue gases that high-temperature flue gas producer 4 produces mix with all the other heat primary airs, enter medium-speed pulverizer 2 as drier, thereby desiccant temperature is increased to 400 DEG C of left and right, and then the drying capacity of increase boiler using brown coal pulverized coal preparation system.

Claims (5)

1. a gas-fired adds the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system of heat primary air, it is characterized in that, comprise medium-speed pulverizer (2), gas generator (3), blower fan (5), high-temperature flue gas producer (4), primary air fan (7), feeder (1) and air preheater (6), the air outlet of primary air fan (7) is divided into two-way, wherein, one tunnel is connected with the air intake vent of air preheater (6), and another road is connected with the gas access of medium-speed pulverizer (2), the gas outlet of air preheater (6) is divided into two-way, wherein a road is connected with the gas access of medium-speed pulverizer (2), another road is connected with the gas access of blower fan (5), the gas vent of blower fan (5) is divided into two-way, wherein, one tunnel is connected by the turbulent burner entrance at pipeline Guan Houyu high-temperature flue gas producer (4) top with the gas exit of gas generator (3), another road is connected with the Secondary Air tangential inlet of high-temperature flue gas producer (4), the exhanst gas outlet of high-temperature flue gas producer (4) is connected with the gas access of medium-speed pulverizer (2), the coal-in port of medium-speed pulverizer (2) is connected with the coal outlet of feeder (1).
2. gas-fired according to claim 1 adds the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system of heat primary air, it is characterized in that, between the air outlet of described primary air fan (7) and the gas access of medium-speed pulverizer (2), be connected by valve.
3. gas-fired according to claim 1 adds the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system of heat primary air, it is characterized in that, the gas outlet of described air preheater (6) is connected by valve with the gas access of medium-speed pulverizer (2).
4. gas-fired according to claim 1 adds the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system of heat primary air, it is characterized in that, the gas vent of described blower fan (5) is connected by valve with the Secondary Air tangential inlet of high-temperature flue gas producer (4).
5. gas-fired according to claim 1 adds the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system of heat primary air, it is characterized in that, the gas vent of described blower fan (5) is connected by valve with the turbulent burner entrance at high-temperature flue gas producer (4) top.
CN201420164140.8U 2014-04-04 2014-04-04 High-moisture lignite medium speed mill coal pulverizing system using coal gas combustion heating primary air Withdrawn - After Issue CN203771438U (en)

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CN201420164140.8U CN203771438U (en) 2014-04-04 2014-04-04 High-moisture lignite medium speed mill coal pulverizing system using coal gas combustion heating primary air

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103925606A (en) * 2014-04-04 2014-07-16 西安西热锅炉环保工程有限公司 High-moisture lignite medium-speed coal mill pulverizing system heating primary air through coal gas burning
CN104990097A (en) * 2015-06-15 2015-10-21 上海发电设备成套设计研究院 Method for improving stain coking of burning high-sodium coal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103925606A (en) * 2014-04-04 2014-07-16 西安西热锅炉环保工程有限公司 High-moisture lignite medium-speed coal mill pulverizing system heating primary air through coal gas burning
CN104990097A (en) * 2015-06-15 2015-10-21 上海发电设备成套设计研究院 Method for improving stain coking of burning high-sodium coal

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AV01 Patent right actively abandoned

Granted publication date: 20140813

Effective date of abandoning: 20160511

AV01 Patent right actively abandoned

Granted publication date: 20140813

Effective date of abandoning: 20160511

C25 Abandonment of patent right or utility model to avoid double patenting