CN103925605A - High-moisture lignite medium-speed coal mill pulverizing system heating primary air through pulverized coal burning - Google Patents
High-moisture lignite medium-speed coal mill pulverizing system heating primary air through pulverized coal burning Download PDFInfo
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Abstract
The invention discloses a high-moisture lignite medium-speed coal mill pulverizing system heating primary air through pulverized coal burning. The system comprises a coal feeder, a medium-speed coal mill, a cyclone separator, a feeder, a high-temperature flue gas generator, a burner, a boiler, a fan, an air preheater and a primary air fan. Part of boiler heat primary air and pulverized coal at an outlet of the coal mill are led into the high-temperature flue gas generator for burning, and hot flue gas generated by burning and rest heat primary air are mixed to serve as a drying agent to enter the coal mill, so that temperature of the drying agent is increased, and drying capability of the lignite boiler pulverizing system is improved. By the system, the problem that an existing high-moisture lignite medium-speed coal mill pulverizing system heating primary air through pulverized coal burning is insufficient in drying capability is solved.
Description
Technical field
The invention belongs to the powder process field of boiler using brown coal, be specifically related to the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system that a kind of coal dust firing 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 can bring difficulty to the flow field in stove and burning tissue.
Contradiction between pulverized coal preparation system drying capacity and burning tissue directly affects enterprise operation security, economy.Simultaneously from operation in recent years with adjust result, be difficult to find effective adjustment means to address the above problem.Because brown coal are the major impetus coals in China northeast and area, Inner Mongol, so solve the problems referred to above of this coal, can significantly improve the level of utilizing of China's brown coal, improve economy and the security of unit operation, instruct the design improvement of China's boiler using brown coal simultaneously.Therefore the proposition of this scheme has important practical significance, and the achievement in research of acquisition has certain using value, and can bring obvious social benefit.
Summary of the invention
The object of the invention 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 coal dust firing to add heat primary air, 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 coal dust firing of the present invention adds heat primary air comprises feeder, medium-speed pulverizer, cyclone separator, dispenser, high-temperature flue gas producer, burner, boiler, blower fan, air preheater and primary air fan, 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, another road is connected with the gas access of medium-speed pulverizer, the gas outlet of air preheater is divided into two-way, wherein, one tunnel is connected with the air intake of blower fan, another road is connected with the gas access of medium-speed pulverizer, the air outlet 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 discharge of dispenser, 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 export of feeder is connected with the coal entrance of medium-speed pulverizer, the breeze airflow outlet of medium-speed pulverizer is connected with the burner inlet on entrance and the boiler of cyclone separator respectively, the discharge of cyclone separator is connected with the coal powder entrance of dispenser, the weary gas outlet of cyclone separator is connected with the burner inlet on boiler.
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 air outlet of described blower fan is connected by valve with the Secondary Air tangential inlet of high-temperature flue gas producer.
The air outlet of described blower fan is connected by valve with the turbulent burner entrance at high-temperature flue gas producer top.
The present invention has following beneficial effect:
Coal dust firing of the present invention adds the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system of heat primary air by medium-speed pulverizer, cyclone separator, dispenser, blower fan and high-temperature flue gas producer form, a part of coal dust air-flow of medium-speed pulverizer output is input in cyclone separator, breeze airflow is isolated coal dust and weary gas through cyclone separator, coal dust enters the burning of high-temperature flue gas producer through dispenser, weary gas enters boiler-burner, the coal dust of a part of heat primary air that air preheater produces and dispenser output burns in high-temperature flue gas producer, 1600 DEG C～1800 DEG C hot flue gases that burning produces mix with all the other heat primary airs, enter in medium-speed pulverizer as drier, thereby desiccant temperature is increased to 400 DEG C of left and right, and then the drying capacity of enhancing high-moisture brown coal, the present invention 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 invention.
Wherein, 1 is that feeder, 2 is that medium-speed pulverizer, 3 is that cyclone separator, 4 is that dispenser, 5 is that high-temperature flue gas producer, 6 is that burner, 7 is that boiler, 8 is that blower fan, 9 is that air preheater, 10 is primary air fan.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail:
With reference to figure 1, the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system that coal dust firing of the present invention adds heat primary air comprises feeder 1, medium-speed pulverizer 2, cyclone separator 3, dispenser 4, high-temperature flue gas producer 5, burner 6, boiler 7, blower fan 8, air preheater 9 and primary air fan 10, the air outlet of primary air fan 10 is divided into two-way, wherein, one tunnel is connected with the air intake vent of air preheater 9, another road is connected with the gas access of medium-speed pulverizer 2, the gas outlet of air preheater 9 is divided into two-way, wherein, one tunnel is connected with the air intake of blower fan 8, another road is connected with the gas access of medium-speed pulverizer 2, the air outlet of blower fan 8 is divided into two-way, wherein, one tunnel is connected by the turbulent burner entrance at pipeline Guan Houyu high-temperature flue gas producer 5 tops with the discharge of dispenser 4, another road is connected with the Secondary Air tangential inlet of high-temperature flue gas producer 5, the exhanst gas outlet of high-temperature flue gas producer 5 is connected with the gas access of medium-speed pulverizer 2, the coal export of feeder 1 is connected with the coal entrance of medium-speed pulverizer 2, the breeze airflow outlet of medium-speed pulverizer 2 is connected with burner 6 entrances on entrance and the boiler 7 of cyclone separator 3 respectively, the discharge of cyclone separator 3 is connected with the coal powder entrance of dispenser 4, the weary gas outlet of cyclone separator 3 is connected with burner 6 entrances on boiler 7.In addition, between the gas access of the air outlet of primary air fan 10 and medium-speed pulverizer 2, be connected by the first valve, the gas outlet of air preheater 9 is connected by the second valve with the gas access of medium-speed pulverizer 2, the air outlet of described blower fan 8 is connected by the 3rd valve with the Secondary Air tangential inlet of high-temperature flue gas producer 5, and the air outlet of described blower fan 8 is connected by the 4th valve with the turbulent burner entrance at high-temperature flue gas producer 5 tops.
For specific works process of the present invention is:
The part breeze airflow that described medium-speed pulverizer 2 produces is isolated coal dust and weary gas through cyclone separator 3, coal dust enters high-temperature flue gas producer 5 through dispenser 4, weary gas enters the burner 6 of boiler 7, through air preheater, 9 heating produce heat primary air to air simultaneously, heat primary air is divided into two parts, wherein a part of heat primary air is divided into two-way through blower fan 8 and enters in high-temperature flue gas producer 5, one tunnel is carried coal dust and is participated in burning by the turbulent burner that is arranged in high-temperature flue gas producer 5 tops, another road tangentially enters in high-temperature flue gas producer 5 as Secondary Air, 1600 DEG C～1800 DEG C hot flue gases that high-temperature flue gas producer 5 produces mix with another part heat primary air, enter in medium-speed pulverizer 2 as drier, thereby make desiccant temperature be increased to 400 DEG C of left and right, and then the drying capacity of increase boiler using brown coal 7 pulverized coal preparation systems.
Claims (5)
1. a coal dust firing adds the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system of heat primary air, it is characterized in that, comprise feeder (1), medium-speed pulverizer (2), cyclone separator (3), dispenser (4), high-temperature flue gas producer (5), burner (6), boiler (7), blower fan (8), air preheater (9) and primary air fan (10), the air outlet of primary air fan (10) is divided into two-way, wherein, one tunnel is connected with the air intake vent of air preheater (9), another road is connected with the gas access of medium-speed pulverizer (2), the gas outlet of air preheater (9) is divided into two-way, wherein, one tunnel is connected with the air intake of blower fan (8), another road is connected with the gas access of medium-speed pulverizer (2), the air outlet of blower fan (8) is divided into two-way, wherein, one tunnel is connected by the turbulent burner entrance at pipeline Guan Houyu high-temperature flue gas producer (5) top with the discharge of dispenser (4), another road is connected with the Secondary Air tangential inlet of high-temperature flue gas producer (5), the exhanst gas outlet of high-temperature flue gas producer (5) is connected with the gas access of medium-speed pulverizer (2), the coal export of feeder (1) is connected with the coal entrance of medium-speed pulverizer (2), the breeze airflow outlet of medium-speed pulverizer (2) is connected with burner (6) entrance on entrance and the boiler (7) of cyclone separator (3) respectively, the discharge of cyclone separator (3) is connected with the coal powder entrance of dispenser (4), the weary gas outlet of cyclone separator (3) is connected with burner (6) entrance on boiler (7).
2. coal dust firing 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 (10) and the gas access of medium-speed pulverizer (2), be connected by valve.
3. coal dust firing 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 (9) is connected by valve with the gas access of medium-speed pulverizer (2).
4. coal dust firing 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 air outlet of described blower fan (8) is connected by valve with the Secondary Air tangential inlet of high-temperature flue gas producer (5).
5. coal dust firing 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 air outlet of described blower fan (8) is connected by valve with the turbulent burner entrance at high-temperature flue gas producer (5) top.
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| CN201410136233.4A CN103925605B (en) | 2014-04-04 | 2014-04-04 | Coal dust firing adds the high water content brown coal medium-speed pulverizer pulverized coal preparation system of heat primary air |
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| CN201410136233.4A CN103925605B (en) | 2014-04-04 | 2014-04-04 | Coal dust firing adds the high water content brown coal medium-speed pulverizer pulverized coal preparation system of heat primary air |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104549693A (en) * | 2014-12-15 | 2015-04-29 | 西安西热锅炉环保工程有限公司 | Medium-speed coal mill and medium-speed coal milling method suitable for high-moisture lignite |
| CN104633637A (en) * | 2014-12-12 | 2015-05-20 | 国家电网公司 | Coal-fired boiler system |
| CN107470009A (en) * | 2017-09-11 | 2017-12-15 | 西安西热锅炉环保工程有限公司 | The frequency conversion rotation coal dust depth separation equipartition device and method of a kind of medium-speed pulverizer |
| CN110319608A (en) * | 2019-07-17 | 2019-10-11 | 哈尔滨锅炉厂有限责任公司 | Utilize the system of tower type solar fused salt collection hot working fluid heating coal-fired boiler hot primary wind |
| CN112108260A (en) * | 2020-10-14 | 2020-12-22 | 西安热工研究院有限公司 | Pulverizing system and method suitable for high-moisture coal |
| CN112452521A (en) * | 2020-11-05 | 2021-03-09 | 西安热工研究院有限公司 | Method for calibrating inlet air volume coefficient of medium-speed coal mill |
| CN112833387A (en) * | 2021-01-07 | 2021-05-25 | 神华神东煤炭集团有限责任公司 | Boiler system for adjusting temperature of flue gas in hearth |
| CN113819458A (en) * | 2021-11-01 | 2021-12-21 | 西安热工研究院有限公司 | System and method for improving drying output of medium-speed coal mill based on medium-temperature furnace smoke extraction |
| CN114659083A (en) * | 2022-03-28 | 2022-06-24 | 西安热工研究院有限公司 | Light and heat coupling high temperature air burning HTAC's coal fired boiler degree of depth peak shaving system |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104633637A (en) * | 2014-12-12 | 2015-05-20 | 国家电网公司 | Coal-fired boiler system |
| CN104549693A (en) * | 2014-12-15 | 2015-04-29 | 西安西热锅炉环保工程有限公司 | Medium-speed coal mill and medium-speed coal milling method suitable for high-moisture lignite |
| CN107470009A (en) * | 2017-09-11 | 2017-12-15 | 西安西热锅炉环保工程有限公司 | The frequency conversion rotation coal dust depth separation equipartition device and method of a kind of medium-speed pulverizer |
| CN107470009B (en) * | 2017-09-11 | 2023-03-28 | 西安西热锅炉环保工程有限公司 | Device and method for deeply separating and equally dividing variable-frequency rotating pulverized coal of medium-speed coal mill |
| CN110319608A (en) * | 2019-07-17 | 2019-10-11 | 哈尔滨锅炉厂有限责任公司 | Utilize the system of tower type solar fused salt collection hot working fluid heating coal-fired boiler hot primary wind |
| CN112108260A (en) * | 2020-10-14 | 2020-12-22 | 西安热工研究院有限公司 | Pulverizing system and method suitable for high-moisture coal |
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| CN112452521A (en) * | 2020-11-05 | 2021-03-09 | 西安热工研究院有限公司 | Method for calibrating inlet air volume coefficient of medium-speed coal mill |
| CN112833387A (en) * | 2021-01-07 | 2021-05-25 | 神华神东煤炭集团有限责任公司 | Boiler system for adjusting temperature of flue gas in hearth |
| CN113819458A (en) * | 2021-11-01 | 2021-12-21 | 西安热工研究院有限公司 | System and method for improving drying output of medium-speed coal mill based on medium-temperature furnace smoke extraction |
| CN114659083A (en) * | 2022-03-28 | 2022-06-24 | 西安热工研究院有限公司 | Light and heat coupling high temperature air burning HTAC's coal fired boiler degree of depth peak shaving system |
| CN114659083B (en) * | 2022-03-28 | 2024-03-26 | 西安热工研究院有限公司 | Light-heat coupling high-temperature air combustion HTAC coal-fired boiler depth peak regulation system |
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