CN111359765A - System for improving flexibility of temperature regulation of outlet of coal mill - Google Patents
System for improving flexibility of temperature regulation of outlet of coal mill Download PDFInfo
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- CN111359765A CN111359765A CN202010306428.4A CN202010306428A CN111359765A CN 111359765 A CN111359765 A CN 111359765A CN 202010306428 A CN202010306428 A CN 202010306428A CN 111359765 A CN111359765 A CN 111359765A
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- 239000003245 coal Substances 0.000 title claims abstract description 112
- 238000005259 measurement Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims 1
- 239000000843 powder Substances 0.000 abstract description 20
- 239000000203 mixture Substances 0.000 abstract description 19
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000010298 pulverizing process Methods 0.000 description 16
- 238000002485 combustion reaction Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002802 bituminous coal Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003077 lignite Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/04—Safety devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a system for improving the flexibility of adjusting the temperature of an outlet of a coal mill, which comprises a primary fan (1), an air preheater (2), a coal mill (3) and a bypass cold air pipeline (4); the outlet of the primary air fan (1) is divided into two paths, one path is communicated to the inlet of the coal mill (3), the other path is communicated to the inlet of the air preheater (2), the outlet of the air preheater (2) is communicated to the inlet of the coal mill (3), and the bypass cold air pipeline (4) is communicated between the inlet and the outlet of the air preheater (2). The bypass air duct is additionally arranged at the front and rear ducts at the primary hot air side of the original air preheater, so that the primary air quantity entering the air preheater for heating is adjustable, when the actual coal-fired moisture is low, the primary air quantity entering the air preheater is reduced through the arranged bypass air duct, the primary air-hot air ratio at the inlet of the coal mill is reduced, and the outlet temperature of the primary air-powder mixture is ensured to meet the design requirement.
Description
Technical Field
The invention belongs to the technical field of coal-fired boiler pulverizing systems, and particularly relates to a system for improving the flexibility of adjusting the temperature of an outlet of a coal mill.
Background
The coal quality characteristics have important influence on the safety, the economy and the environmental protection characteristics of boiler combustion. At present, due to the continuous consumption of coal resources and the variation fluctuation of coal markets, and in order to better control the power generation cost, the coal quality of the large power plants is continuously changed, and the coal quality for burning of a plurality of power plants is miscellaneous and has a large number of sources, so that the actual coal quality for burning deviates from the design and coal quality checking. The change of the coal quality directly leads to the change of the combustion characteristics of the boiler, and brings great hidden danger to the safe and stable operation of the unit.
For most of the main coal-fired units in China at present, coal needs to be processed by a coal pulverizing system before entering a boiler, raw coal is prepared into fine-particle coal powder capable of being efficiently combusted by the boiler, primary air is used as a conveying medium, and a mixture of the air and the powder is conveyed into a boiler hearth to participate in combustion. According to the requirements, the temperature of the air-powder mixture at the outlet of the coal mills with different coal qualities needs to meet the relevant design requirements so as to ensure the safe and economic operation of the coal pulverizing system. The over-high or over-low temperature of the mixture is not beneficial to the safe and stable combustion of the boiler, so the temperature of the air-powder mixture of the pulverizing system has important significance for the safe and stable operation of the coal-fired boiler.
At present, the traditional control mode of the temperature of the air-powder mixture is mainly adjusted by primary air entering a coal mill, and when the quality of coal for combustion greatly deviates from a design value, the existing coal pulverizing system cannot meet the temperature control requirement of the air-powder mixture of the coal pulverizing system. Aiming at the situation that the designed coal has low moisture (such as bituminous coal) and the coal actually used for combustion has large moisture (such as lignite), the hot primary air temperature of the air preheater can be increased by reversing the air preheater or adding a fan heater, so that the drying effect on the moisture of the pulverized coal is improved, and the temperature of the air-powder mixture is increased. However, no effective solution and method exist for the situation that the designed coal has large moisture (such as lignite) and the actual coal burned has low moisture (such as bituminous coal). For coal with high moisture, the proportion of hot air in primary air is designed to be higher, namely the corresponding hot air pipeline is thicker and the corresponding cold air pipeline is thinner, and when a large proportion of coal with low moisture is mixed and burned in a boiler, the required hot air quantity is greatly reduced.
Disclosure of Invention
The invention aims to provide a system for improving the temperature regulation flexibility of an outlet of a coal mill aiming at the limitation of the existing coal pulverizing system, so that a unit can still normally run under the condition that the coal quality greatly deviates from the design condition. Meanwhile, the flexible and adjustable characteristics of the coal pulverizing system enable the traditional coal pulverizing system to have better wide coal type adaptability. The safe, stable and economic operation of the unit is ensured.
The invention is realized by adopting the following technical scheme:
a system for improving the flexibility of adjusting the temperature of an outlet of a coal mill comprises a primary fan, an air preheater, the coal mill and a bypass cold air pipeline; the outlet of the primary fan is divided into two paths, one path is communicated to the inlet of the coal mill, the other path is communicated to the inlet of the air preheater, the outlet of the air preheater is communicated to the inlet of the coal mill, and the bypass cold air pipeline is communicated between the inlet and the outlet of the air preheater.
The invention has the further improvement that a bypass shutoff valve and a bypass adjusting valve are arranged on the bypass cold air pipeline.
The invention is further improved in that a temperature sensor is arranged at the outlet of the coal mill, and the actions of the bypass shutoff door and the bypass adjusting door are controlled by the measurement result feedback of the temperature sensor.
The invention is further improved in that a cold air adjusting door is arranged on a pipeline which is communicated with the outlet of the primary air fan and the inlet of the coal mill.
The invention is further improved in that a hot air adjusting door is arranged on a pipeline which is communicated with an outlet of the air preheater and an inlet of the coal mill.
The invention is further improved in that a total air volume adjusting door is arranged on the pipeline at the inlet of the coal mill.
The invention has at least the following beneficial technical effects:
according to the system for improving the flexibility of adjusting the outlet temperature of the coal mill, the bypass air pipelines are additionally arranged at the front pipeline and the rear pipeline on the primary hot air side of the original air preheater, so that the primary air quantity entering the air preheater for heating is adjustable, when the moisture of coal for actual combustion is low, the primary air quantity entering the air preheater is reduced through the arranged bypass air channels, the primary air hot air proportion of the inlet of the coal mill is reduced, and the outlet temperature of a primary air-powder mixture is ensured to meet the design requirement.
Furthermore, the opening and closing of the bypass cold air and the air volume adjustment are realized by additionally arranging an opening and closing door and an adjusting door on the pipeline, and when the moisture of the coal is high and the cold air volume does not need to be additionally increased, the air volume opening and closing door on the bypass pipeline keeps a closed state; when coal moisture is low and the cold air quantity needs to be additionally increased, the air quantity switch door on the bypass pipeline is kept in an open state. Meanwhile, in the actual operation process, the opening degree of the air volume adjusting valve on the bypass pipeline is fed back and adjusted according to the temperature sensor arranged at the outlet of the coal mill so as to control the air volume of the bypass, and further the control requirement on the temperature of the primary air-powder mixture at the outlet of the coal mill under different coal quality conditions is met.
Compared with the traditional method that the temperature of the inlet air of the coal mill is adjusted by only one path of cold air and one path of hot air in the coal pulverizing system, the method for adjusting the temperature of the coal pulverizing system with the bypass air pipeline improves the adverse condition that the original primary air pipeline system cannot be further adjusted when the coal quality is greatly changed. In actual operation, according to the moisture of coal and the temperature of the coal mill outlet air-powder mixture, the bypass air pipeline is adjusted and controlled to be opened and closed, and the proportion of cold air and hot air can be accurately controlled through the air volume adjusting door, so that the flexible adjustment of a coal pulverizing system under wide coal types is realized, and the safe, stable and economic operation of a unit is ensured.
Specifically, the present invention has the following advantages:
1) aiming at the unit with the coal quality greatly deviating design (the designed coal quality has large water content and the actual coal quality has small water content), the bypass air pipeline is additionally arranged, the potential safety hazard that the temperature of the primary air-powder mixture at the outlet of the coal mill is too high due to insufficient cold air is solved, and the technical scheme is simple, reliable and low in manufacturing cost.
2) The switch door and the adjusting door are additionally arranged on the bypass cold air pipeline, so that the bypass pipeline can be switched on and off according to the moisture of the coal and the outlet temperature of the air-powder mixture, the cold air and hot air proportion can be accurately controlled through the air volume adjusting door, and the control requirement of the coal with different moisture on the temperature of the primary air-powder mixture at the outlet of the coal mill is met.
3) According to the technical scheme, an air pipe system under the original designed coal quality condition is not changed, and the temperature of a primary air-powder mixture at the outlet of a coal mill can be ensured under the condition that the coal quality moisture is greatly reduced by additionally arranging a bypass cold air pipeline, a switch door and an adjusting door; meanwhile, when the coal market fluctuates again without large-proportion coal quality with low moisture content, the scheme can lead the unit to return to the original design working condition by adjusting without participating in operation, thereby ensuring the safe, stable and economic operation of the unit under various conditions and having good flexibility and coal quality adaptability.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Description of reference numerals:
1 is a primary air fan, 2 is air heater, 3 is the coal pulverizer, 4 is the bypass air duct way, 5 is the bypass shutoff door, 6 is the bypass regulation door, 7 is total air regulation door, 8 is hot-blast regulation door, 9 is cold wind regulation door, 10 is temperature sensor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the system for improving the flexibility of adjusting the outlet temperature of the coal mill provided by the invention comprises a primary air fan 1, an air preheater 2, a coal mill 3 and a bypass cold air duct 4; the outlet of the primary air fan 1 is divided into two paths, one path is communicated to the inlet of the coal mill 3, the other path is communicated to the inlet of the air preheater 2, the outlet of the air preheater 2 is communicated to the inlet of the coal mill 3, and the bypass cold air pipeline 4 is communicated between the inlet and the outlet of the air preheater 2. Through the additionally arranged bypass cold air pipeline 4, part of cold air entering the air preheater can be bypassed and is directly communicated with a hot air pipeline at the outlet of the air preheater without heat exchange of the air preheater.
And a bypass shut-off door 5 and a bypass adjusting door 6 are arranged on the bypass cold air pipeline 4 and used for controlling and adjusting the opening, closing and air volume of bypass cold air. Meanwhile, a temperature sensor 10 is arranged at the outlet of the coal mill 3, and the actions of the bypass shutoff door 5 and the bypass adjusting door 6 are feedback-controlled by the measurement result of the temperature sensor 10.
And a cold air adjusting door 9 is arranged on a pipeline communicated with the inlet of the coal mill 3 from the outlet of the primary air fan 1. And a hot air adjusting door 8 is arranged on a pipeline communicated with the outlet of the air preheater 2 to the inlet of the coal mill 3. And a total air volume adjusting valve 7 is arranged on the pipeline at the inlet of the coal mill 3.
The invention arranges one path of bypass air pipeline 4 in front of and behind the primary hot air pipeline of the air preheater 2 in the original powder making system, thereby leading the primary air quantity entering the air preheater to be adjusted according to the actual requirement. The air volume of the bypass air is fed back and adjusted through the real-time measurement result of the temperature sensor 10 to the bypass shutoff valve 5 and the bypass adjusting valve 6 on the bypass air pipeline 4, so that the volume and the temperature of primary hot air entering the coal mill are adjusted. The hot primary air and cold primary air pipelines of the original coal pulverizing system are kept unchanged, the air quantity of the hot primary air and cold primary air pipelines is respectively adjusted through a hot air adjusting door 8 and a cold air adjusting door 9 at the inlet of the coal mill, and the primary air quantity entering the coal mill 3 is finally adjusted through a total air quantity adjusting door 7.
And (3) system operation mode: when the unit is used for combustion design of coal quality, the coal pulverizing system operates according to an original mode, the bypass air pipeline 4 does not participate, the bypass shutoff door 5 is kept closed, hot primary air and cold primary air of the original coal pulverizing system are respectively regulated through the hot air regulating door 8 and the cold air regulating door 9, and finally primary air entering the coal mill 3 is regulated through the main air regulating door 7.
According to the operation requirement, when the unit burns low-moisture coal quality, the temperature sensor 10 at the outlet of the coal mill detects that the temperature of the air-powder mixture exceeds the design value, which indicates that the temperature of the pulverizing system is too high, and the required hot air quantity is reduced. At the moment, the cold air adjusting door 9 is adjusted firstly, when the cold air adjusting door 9 is adjusted to be fully opened and the temperature of the coal mill outlet air-powder mixture is still higher than the design requirement, the bypass shutoff door 5 is opened, namely primary air entering the air preheater 2 is reduced, the hot primary air quantity at the outlet of the air preheater is reduced, and the air temperature after mixing is reduced. In the actual operation process, the temperature of the air-powder mixture is measured in real time according to a temperature sensor arranged at the outlet of the coal mill, the opening degree of a bypass adjusting door 6 on a bypass air pipeline 4 is adjusted in a feedback mode, the cold air volume of a bypass is controlled, and the control requirement on the temperature of the primary air-powder mixture at the outlet of the coal mill is met.
Claims (6)
1. A system for improving the flexibility of adjusting the temperature of an outlet of a coal mill is characterized by comprising a primary air fan (1), an air preheater (2), the coal mill (3) and a bypass cold air pipeline (4); wherein the content of the first and second substances,
the outlet of the primary air fan (1) is divided into two paths, one path is communicated to the inlet of the coal mill (3), the other path is communicated to the inlet of the air preheater (2), the outlet of the air preheater (2) is communicated to the inlet of the coal mill (3), and the bypass cold air pipeline (4) is communicated between the inlet and the outlet of the air preheater (2).
2. The system for improving the flexibility of adjusting the outlet temperature of the coal mill is characterized in that a bypass shutoff valve (5) and a bypass adjusting valve (6) are arranged on the bypass cold air duct (4).
3. The system for improving the flexibility of adjusting the outlet temperature of the coal mill is characterized in that a temperature sensor (10) is arranged at the outlet of the coal mill (3), and the actions of the bypass shutoff door (5) and the bypass adjusting door (6) are controlled by the feedback of the measurement result of the temperature sensor (10).
4. The system for improving the flexibility of adjusting the outlet temperature of the coal mill is characterized in that a cold air adjusting door (9) is arranged on a pipeline of an outlet of the primary air fan (1) communicated with an inlet of the coal mill (3).
5. The system for improving the flexibility of adjusting the outlet temperature of the coal mill is characterized in that a hot air adjusting door (8) is arranged on a pipeline of an outlet of the air preheater (2) communicated to an inlet of the coal mill (3).
6. The system for improving the flexibility of adjusting the outlet temperature of a coal mill according to claim 1, characterized in that a total air volume adjusting door (7) is arranged on the inlet pipeline of the coal mill (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010306428.4A CN111359765A (en) | 2020-04-17 | 2020-04-17 | System for improving flexibility of temperature regulation of outlet of coal mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010306428.4A CN111359765A (en) | 2020-04-17 | 2020-04-17 | System for improving flexibility of temperature regulation of outlet of coal mill |
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| CN111359765A true CN111359765A (en) | 2020-07-03 |
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| CN202010306428.4A Pending CN111359765A (en) | 2020-04-17 | 2020-04-17 | System for improving flexibility of temperature regulation of outlet of coal mill |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112742543A (en) * | 2020-12-18 | 2021-05-04 | 阿尔法（江苏）重工科技有限公司 | Air outlet temperature and air direction adjusting device for roller disc type coal mill |
| CN114632614A (en) * | 2022-03-14 | 2022-06-17 | 西安热工研究院有限公司 | Automatic control system and method for warm grinding of coal mill |
| CN116213039A (en) * | 2023-05-08 | 2023-06-06 | 哈尔滨博深科技发展有限公司 | Medium speed pulverizer combination that adaptation multiple coal types used is carried and is imitated wind ring device |
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| CN203525846U (en) * | 2013-09-29 | 2014-04-09 | 山东奥能电力科技有限公司 | Ball mill control device |
| CN204987057U (en) * | 2015-09-11 | 2016-01-20 | 上海明华电力技术工程有限公司 | Coal pulverizer energy -conservation heat regenerative system that adjusts temperature |
| CN108916904A (en) * | 2018-03-13 | 2018-11-30 | 中国神华能源股份有限公司 | A kind of thermal power generation system |
| CN212040952U (en) * | 2020-04-17 | 2020-12-01 | 西安热工研究院有限公司 | System for improving flexibility of temperature regulation of outlet of coal mill |
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2020
- 2020-04-17 CN CN202010306428.4A patent/CN111359765A/en active Pending
Patent Citations (6)
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| JP2002143714A (en) * | 2000-11-10 | 2002-05-21 | Babcock Hitachi Kk | Monitoring device for operating state of pulverizer |
| CN103438686A (en) * | 2013-08-16 | 2013-12-11 | 上海明华电力技术工程有限公司 | Primary air cooler heat regenerative system and controlling method |
| CN203525846U (en) * | 2013-09-29 | 2014-04-09 | 山东奥能电力科技有限公司 | Ball mill control device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112108260B (en) * | 2020-10-14 | 2023-11-07 | 西安热工研究院有限公司 | Powder preparation system and method suitable for high-moisture coal |
| CN112742543A (en) * | 2020-12-18 | 2021-05-04 | 阿尔法（江苏）重工科技有限公司 | Air outlet temperature and air direction adjusting device for roller disc type coal mill |
| CN114632614A (en) * | 2022-03-14 | 2022-06-17 | 西安热工研究院有限公司 | Automatic control system and method for warm grinding of coal mill |
| CN114632614B (en) * | 2022-03-14 | 2023-09-12 | 西安热工研究院有限公司 | Automatic control system and method for warm grinding of coal mill |
| CN116213039A (en) * | 2023-05-08 | 2023-06-06 | 哈尔滨博深科技发展有限公司 | Medium speed pulverizer combination that adaptation multiple coal types used is carried and is imitated wind ring device |
| CN116213039B (en) * | 2023-05-08 | 2023-08-18 | 哈尔滨博深科技发展有限公司 | Medium speed pulverizer combination that adaptation multiple coal types used is carried and is imitated wind ring device |
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