CN217540800U - Boiler load quick response system of medium speed coal mill direct-blowing pulverizing system - Google Patents
Boiler load quick response system of medium speed coal mill direct-blowing pulverizing system Download PDFInfo
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- CN217540800U CN217540800U CN202221520661.3U CN202221520661U CN217540800U CN 217540800 U CN217540800 U CN 217540800U CN 202221520661 U CN202221520661 U CN 202221520661U CN 217540800 U CN217540800 U CN 217540800U
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Abstract
The utility model relates to a pulverized coal boiler powder process system equipment field of thermal power factory specifically is a quick response system of boiler load of powder process system is directly blown to medium speed pulverizer. A boiler load quick response system of a medium-speed coal mill direct-blowing powder preparation system comprises a raw coal bin, a coal feeder, a coal mill, a primary fan, a blower, an air preheater, a hot primary air adjusting baffle, a cold primary air adjusting baffle, an air quantity adjusting baffle, a primary air pipe, a burner, a hearth, a coal powder shutoff door, a powder pipe, a separator, a powder bin, a powder feeder, an exhaust air pipe, a powder exhaust fan inlet adjusting baffle, a powder exhaust fan and a powder exhaust fan outlet baffle. The system is a quick response system which has high operation reliability and can adapt to the deep peak shaving of the boiler.
Description
Technical Field
The utility model relates to a pulverized coal boiler powder process system equipment field of thermal power factory specifically is a quick response system of boiler load of powder process system is directly blown to medium speed pulverizer.
Background
The pulverizing system is a very important auxiliary system in a combustion system of a pulverized coal boiler. The powder making system is a combination of equipment and related connecting pipelines required by grinding raw coal into powder and then feeding the powder into a boiler hearth for suspension combustion. The safe, stable and economic operation of the boiler pulverizing system directly influences the safe, stable and economic operation of the ignition motor set.
The pulverizing system is mainly divided into a direct-blowing type and an intermediate storage type.
In the direct-blowing coal pulverizing system, all the coal powder pulverized by the coal mill is directly fed into the hearth for combustion, and in the running process of the boiler, the coal pulverizing quantity is processed and ground according to the requirement of the load of the boiler and the qualified coal powder is continuously, uniformly and adjustably supplied to the hearth, so that the direct-blowing coal pulverizing system is characterized in that the coal pulverizing quantity of the coal mill is always equal to the fuel consumption of the boiler.
The direct-fired pulverizing system has the advantages of simple system, compact structure, less steel consumption, less investment and lower running power consumption; the method has the disadvantages that the operation condition of the boiler is directly influenced by the operation of the direct-fired pulverizing system equipment, the operation reliability is relatively low, particularly, when the load of the boiler is changed rapidly by adopting the pulverizing system of a medium-speed coal mill, the adjustment of the fuel quantity entering the boiler can only be carried out through the pulverizing quantity of the coal mill, the hysteresis quality of the response load change is large, and the peak regulation capacity of the boiler is poor.
Disclosure of Invention
The utility model discloses a demand to the fuel quantity when can the quick response boiler becomes load provides a quick response system of boiler load of medium speed pulverizer direct-fired powder process system, is a quick response system that operational reliability is high, adaptable boiler degree of depth peak shaving.
The utility model discloses an adopt following technical scheme to realize: a boiler load quick response system of a medium-speed coal mill direct-blowing powder making system comprises a raw coal bin, a coal feeder, a coal mill, a primary fan, a blower, an air preheater, a hot primary air adjusting baffle, a cold primary air adjusting baffle, an air quantity adjusting baffle, a primary air pipe, a burner, a hearth, a coal powder shutoff door, a powder pipe, a separator, a powder bin, a powder feeder, an exhaust pipe, a powder exhaust fan inlet adjusting baffle, a powder exhaust fan and a powder exhaust fan outlet baffle;
the raw coal bin is connected with a coal feeder, an outlet of the coal feeder is connected with the coal mill through a coal dropping pipe, the outlet of the coal mill is connected with a burner and a hearth through a primary air pipe, an outlet of the coal mill is connected with an inlet of a separator through a powder pipe, a pulverized coal shutoff door is arranged on the powder pipe, the lower end of the separator is connected with the powder bin, the upper end of the separator is connected with an inlet of a powder exhaust fan through an exhaust pipe, an inlet adjusting baffle of the powder exhaust fan is further arranged on the exhaust pipe, an outlet of the powder exhaust fan is connected with the primary air pipe through a pipeline, an outlet of the powder bin is connected with the primary air pipe through a pipeline, a powder feeder is arranged on the pipeline, a preheating air channel connected with the primary air fan passes through an air preheater at an outlet of the hearth and then is connected with the coal feeder, a hot primary air adjusting baffle and an air quantity adjusting baffle are arranged on the preheating air channel, the primary air fan is connected with a cold air channel through a cold air channel, and the preheating air channel connected with the burner and the hearth after passing through the air preheater.
In the boiler load quick response system of the medium-speed coal mill direct-blowing powder making system, the powder bin is matched with relevant matched equipment such as an explosion door, a powder level meter, a temperature measuring device, an inert gas protection system (nitrogen or carbon dioxide) and the like.
The volume of the powder bin is set according to the rated output of the coal mill for 2-3 minutes, taking a 600MW unit as an example, the volume is about 4-6 m 3 The coal pulverizer can be provided with 1 coal pulverizer, and can also be provided with a plurality of coal pulverizers to meet the requirement of the unit on the coal quantity in the load-up stage, the powder bin is provided with a powder level meter (particularly, an ultrasonic powder level meter can be preferred) to monitor the powder level of the powder bin, and the powder bin is prevented from being damagedFull powder, be provided with explosion vent, avoid the gas-powder mixture to explode the damage to equipment, be provided with temperature-measuring device and be used for monitoring powder storehouse buggy temperature, prevent that the too high emergence spontaneous combustion of buggy temperature is provided with inert gas fire extinguishing systems for put out a fire when powder storehouse catches fire.
The utility model has the advantages of it is following:
1. the utility model provides a demand of powder process system to the coal feed volume when the boiler carries the load fast, through setting up buggy storage system in the coal pulverizer export, when the boiler carries the load fast, solved the coal pulverizer powder process delay problem of exerting oneself, the combustor can match the demand that the boiler carried the load rapidly for the powder volume, is favorable to the thermal power generating unit to realize nimble degree of depth peak regulation.
2. The utility model discloses widen the combustion stability demand of medium speed pulverizer powder process system, guaranteed that the boiler can realize safety, economy, steady operation when promoting the load fast.
3. The utility model discloses reform transform conveniently, swift, the system does not need the blowing out can carry out online upgrade when reforming transform and reform transform the time shorter.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1-raw coal bunker, 2-coal feeder, 3-coal mill, 4-primary air fan, 5-air blower, 6-air preheater, 7-hot primary air regulating baffle, 8-cold primary air regulating baffle, 9-air quantity regulating baffle, 10-primary air pipe, 11-burner, 12-hearth, 13-pulverized coal shutoff door, 14-powder pipe, 15-separator, 16-powder bunker, 17-powder feeder, 18-exhaust air pipe, 19-powder discharge fan inlet regulating baffle, 20-powder discharge fan and 21-powder discharge fan outlet baffle.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Please refer to fig. 1.
A boiler load quick response system of a medium speed coal mill direct-blowing powder process system comprises (part of equipment utilizes the original powder process system equipment): the device comprises a raw coal bin 1, a coal feeder 2, a coal mill 3, a primary air fan 4, a blower 5, an air preheater 6, a hot primary air adjusting baffle 7, a cold primary air adjusting baffle 8, an air quantity adjusting baffle 9, a primary air pipe 10, a combustor 11, a hearth 12, a pulverized coal shutoff door 13, a pulverized coal pipe 14, a separator 15, a pulverized coal bin 16, a pulverized coal feeder 17 (particularly preferably an impeller pulverized coal feeder), an exhaust air pipe 18, a pulverized coal discharge fan inlet adjusting baffle 19, a pulverized coal discharge fan 20 and a pulverized coal discharge fan outlet baffle 21 which are connected in a manner shown in figure 1.
Powder storage powder operation mode: when the unit operates in a steady state, the output of the coal mill 3 is properly improved through a thermal control system under the condition of keeping the load of the unit stable, the output of the coal mill 3 is ensured to meet the operation of the unit, meanwhile, fuel enters the coal mill 3 from a raw coal bunker 1 through a coal feeder 2, mixed hot air from a primary fan 4 enters the coal mill 3, the mixed hot air can be used as a drying agent to dry coal powder and can convey the coal powder, a part of the hot air carrying qualified coal powder enters a hearth 12 through a coal mill outlet primary air pipe 10 and a combustor 11, and secondary air from an air feeder 5 and heated by an air preheater 6 is combusted.
And starting the powder discharge fan 20, fully opening the coal powder shutoff door 13 and the outlet baffle 21 of the powder discharge fan, enabling the other part of hot air carrying part of coal powder to enter the coal powder separator 15 through the powder pipe 14 for gas-powder separation, collecting the coal powder to the powder bin 16, and sending exhaust gas still containing 10-15% of coal powder after the air-powder separation to the coal mill outlet primary air pipe 10 through the powder discharge fan 20 and mixing the air powder of the coal mill outlet primary air pipe 10 to enter a hearth for combustion. The powder quantity of the powder pipe 14 can be controlled by an inlet adjusting baffle 19 of the powder discharge fan.
When the powder amount of the powder bin reaches the requirement, the output of the powder discharge fan 20 is gradually reduced to zero by adjusting the inlet adjusting baffle 19 of the powder discharge fan, then the powder discharge fan 20 is stopped, the coal powder shutoff door 13 and the outlet baffle 21 of the powder discharge fan are closed completely, and inert protective gas is filled properly to prevent the coal powder from oxidizing and spontaneously combusting.
Load fast response mode of operation: when the unit rapidly lifts the load, the coal feeding amount and the air volume of the coal mill are increased, but because the load response hysteresis exists, the powder bin conveying system is started, and according to the step characteristic of the unit load, the thermal control system conveys the pulverized coal in the powder bin 16 to the primary air pipe 10 at the outlet of the coal mill by adjusting the output force of the powder feeder 17, and the pulverized coal enters the hearth for combustion after the concentration of the pulverized coal is increased, so that the problem of output force delay of the coal mill when the unit load is rapidly lifted is solved, the steady-state operation of the unit is ensured, and the peak regulation requirement of a power grid is met.
Claims (2)
1. The utility model provides a medium speed coal pulverizer directly blows boiler load quick response system of powder process system which characterized in that: the device comprises a raw coal bin (1), a coal feeder (2), a coal mill (3), a primary air fan (4), an air feeder (5), an air preheater (6), a hot primary air adjusting baffle (7), a cold primary air adjusting baffle (8), an air quantity adjusting baffle (9), a primary air pipe (10), a burner (11), a hearth (12), a coal powder shutoff door (13), a powder pipe (14), a separator (15), a powder bin (16), a powder feeder (17), an exhaust pipe (18), a powder exhaust fan inlet adjusting baffle (19), a powder exhaust fan (20) and a powder exhaust fan outlet baffle (21);
the raw coal bunker (1) is connected with the coal feeder (2), the outlet of the coal feeder (2) is connected with the coal mill (3) through a coal dropping pipe, the outlet of the coal mill (3) is connected with the coal mill (3) through a primary air pipe (10), a burner (11) is connected with a hearth (12), the outlet of the coal mill (3) is also connected with the inlet of a separator (15) through a powder pipe (14), a coal powder shutoff door (13) is arranged on the powder pipe (14), the lower end of the separator (15) is connected with a powder bin (16), the upper end of the separator (15) is connected with the inlet of a powder discharge fan (20) through a waste air pipe (18), a powder discharge fan inlet adjusting baffle (19) is further arranged on the waste air pipe (18), the outlet of the powder discharge fan (20) is connected with the primary air pipe (10) through a pipeline, a powder discharge fan outlet baffle (21) is arranged on the pipeline, the outlet of the powder bin is connected with the primary air pipe (10) through a pipeline, a coal feeder (17) is arranged on the pipeline, the air duct connected with the primary air preheater (3) through an air preheater (6) and a primary air conditioner baffle (7), a primary air duct (7) and a primary air duct (7) are arranged on the primary air preheater (5), and a primary air conditioner baffle (7) are arranged on the primary air duct (6), and a primary air preheater (7) and a primary air conditioner (6), and a primary air duct (7) connected with a primary air conditioner ) And a hearth (12).
2. The system of claim 1, wherein the boiler load of the pulverizing system is fast and the system comprises: the powder bin (16) is matched with an explosion door, a powder level meter, a temperature measuring device and an inert gas protection system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221520661.3U CN217540800U (en) | 2022-06-17 | 2022-06-17 | Boiler load quick response system of medium speed coal mill direct-blowing pulverizing system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221520661.3U CN217540800U (en) | 2022-06-17 | 2022-06-17 | Boiler load quick response system of medium speed coal mill direct-blowing pulverizing system |
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| CN217540800U true CN217540800U (en) | 2022-10-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117823934A (en) * | 2024-01-03 | 2024-04-05 | 南方电网电力科技股份有限公司 | Powder preparation system for direct-blowing coal-fired unit and monitoring control method thereof |
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2022
- 2022-06-17 CN CN202221520661.3U patent/CN217540800U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117823934A (en) * | 2024-01-03 | 2024-04-05 | 南方电网电力科技股份有限公司 | Powder preparation system for direct-blowing coal-fired unit and monitoring control method thereof |
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