CN215489827U - Smoke wind structure of powder making system of thermal power plant - Google Patents
Smoke wind structure of powder making system of thermal power plant Download PDFInfo
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- CN215489827U CN215489827U CN202121514419.0U CN202121514419U CN215489827U CN 215489827 U CN215489827 U CN 215489827U CN 202121514419 U CN202121514419 U CN 202121514419U CN 215489827 U CN215489827 U CN 215489827U
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- Prior art keywords
- furnace
- furnace smoke
- hot
- fan
- coal pulverizer
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- 239000000843 powder Substances 0.000 title claims abstract description 26
- 239000000779 smoke Substances 0.000 title claims description 68
- 239000003245 coal Substances 0.000 claims abstract description 61
- 235000019504 cigarettes Nutrition 0.000 claims abstract description 33
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical group [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000010298 pulverizing process Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000004880 explosion Methods 0.000 abstract description 7
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 239000003546 flue gas Substances 0.000 description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 12
- 239000001301 oxygen Substances 0.000 description 12
- 229910052760 oxygen Inorganic materials 0.000 description 12
- 238000001035 drying Methods 0.000 description 5
- 238000000227 grinding Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012432 intermediate storage Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to a furnace flue gas structure of a pulverizing system of a thermal power plant. At present, before the normal start coal pulverizer, need open the hot-blast door, adjust the cold blast door, warm mill to use the steam of putting out a fire to prevent the explosion when starting the coal pulverizer. The utility model provides a thermal power plant powder process system stove flue gas structure which constitutes and includes: hot stove cigarette tuber pipe (1), cold stove cigarette tuber pipe (2), stove cigarette wind pipeline (3), low temperature over heater (4), A draught fan (5), B draught fan (6) and coal pulverizer, be connected with hot stove cigarette tuber pipe on the export flue of low temperature over heater, be connected with cold stove cigarette tuber pipe on A draught fan and the mixed flue of B draught fan export, be connected with stove cigarette wind pipeline on the entry pipeline of a set of coal pulverizer, stove cigarette wind pipeline respectively with hot stove cigarette tuber pipe and cold stove cigarette wind union coupling. The utility model is applied to the field of thermal power.
Description
Technical Field
The utility model relates to a furnace flue gas structure of a pulverizing system of a thermal power plant.
Background
A2 x 300MW unit in the first period of the Huanen Jinggang mountain power plant adopts an intermediate storage type powder making system, and each unit is provided with four MTZ3560 type low-speed steel ball coal mills produced by Shenyang heavy machinery plants. The inlet main air door of the improved front coal mill has two sources, and is respectively from a cold air pipe at the outlet of the air feeder and a hot air pipe at the outlet of the air preheater. Before the normal start coal pulverizer, need open the hot-blast door, adjust the cold blast door, warm mill to use the steam of putting out a fire to prevent the explosion when starting the coal pulverizer. And as an important component system of a boiler part of a thermal power plant, whether a powder making system is reliable or not is directly related to the combustion working condition of the boiler and the safe and stable operation of the power plant. The oxygen content in the powder making system is greatly reduced by using the furnace smoke wind energy, so that the oxygen content can not reach the oxygen content standard of one of three elements of powder making system explosion, and the powder making system explosion is avoided. The hot furnace smoke air and the hot air are used for mixing and drying, and the exhaust gas is used for feeding powder, so that the heating and grinding can be performed quickly, the exhaust gas temperature is reduced, and the combustion economy is improved. At present, hot furnace smoke wind of the factory can meet the explosion-proof requirement of a powder making system, in order to reduce the smoke exhaust temperature, improve the economical efficiency of a unit and prevent cold furnace smoke wind from corroding a pipeline, the factory only uses hot furnace smoke wind and does not use cold furnace smoke wind at present.
However, only the furnace smoke air is used for warm grinding, so that the temperature at the outlet of the coal mill rises too fast, and certain requirements are made on the operation level and the system familiarity.
Disclosure of Invention
The utility model aims to provide a furnace flue gas structure of a pulverizing system of a thermal power plant.
The above purpose is realized by the following technical scheme:
the utility model provides a thermal power plant powder process system stove flue gas structure which constitutes and includes: hot stove cigarette tuber pipe, cold stove cigarette tuber pipe, low temperature over heater export flue, A draught fan, with B draught fan export hybrid flue, coal pulverizer entry stove cigarette tuber pipe, low temperature over heater's export flue on be connected with hot stove cigarette tuber pipe, A draught fan with B draught fan export hybrid flue on be connected with cold stove cigarette tuber pipe, a set of the entry pipeline of coal pulverizer on be connected with stove cigarette tuber pipe, stove cigarette tuber pipe respectively with hot stove cigarette tuber pipe with cold stove cigarette tuber pipe connect, a set of the coal pulverizer include coal pulverizer A, coal pulverizer B, coal pulverizer C and coal pulverizer D.
The hot-blast furnace gas of powder process system of thermal power plant wind structure, the flue gas pipeline on correspond be connected with a set of coal pulverizer entry flue gas air door electronic damper, to the electronic flashboard door of adjacent stove hot-blast main pipe stove flue gas wind, the electronic flashboard door of A stove cigarette fan export and the electronic flashboard door of B stove cigarette fan export.
The hot-blast stove smoke wind pipe is connected with an electric adjusting door at an inlet of a stove smoke fan A and an electric adjusting door at an inlet of a stove smoke fan B.
The flue gas structure of the powder process system of the thermal power plant, the flue gas pipe of the cooling furnace is connected with an electric adjusting door to an inlet of a flue gas fan of the furnace A, an electric adjusting door to an inlet of a flue gas fan of the furnace B and an electric flashboard door to a main pipe of the flue gas pipe of the cooling furnace.
The utility model has the beneficial effects that:
1. the improved main air door of the inlet of the coal mill has three sources, namely a cold air pipe at the outlet of a blower, a hot air pipe at the outlet of an air preheater and an outlet of a low-temperature superheater. When the coal mill and the coal mill are started to normally operate, the oxygen content and the temperature of the coal mill can be adjusted by using hot air and hot furnace flue gas, and the possibility of explosion of a coal pulverizing system is reduced.
2. The utility model adds a heating furnace smoke air pipe on the outlet flue of the low-temperature superheater, adds a cooling furnace smoke air pipe on the outlet mixing flue of two draught fans, adds a furnace smoke air pipe on the inlet pipeline of the coal mill, adds a furnace smoke fan, a high-temperature furnace smoke main pipe, a low-temperature furnace smoke main pipe, electric doors, an oxygen meter, a thermocouple, a pressure transmitter and other monitoring instruments, and simultaneously adds corresponding automatic, interlocking and protection. After the installation is finished, the equipment pipeline is painted and is anticorrosive, and the color system is required to meet the requirement specification of a power plant.
3. After the improvement of the utility model is completed, when the coal mill is started to start, the hot furnace smoke air can be used for discharging oxygen in the coal mill, so that the oxygen content in the coal mill is quickly reduced to be below 12%, the inlet and outlet temperature of the coal mill is improved, the warm grinding time is reduced, the explosion risk of a powder preparation system is greatly reduced in the operation process, and the safety and the reliability of the powder preparation system are improved. At present, hot furnace smoke wind of the factory can meet the explosion-proof requirement of a powder making system, in order to reduce the smoke exhaust temperature, improve the economical efficiency of a unit and prevent cold furnace smoke wind from corroding a pipeline, the factory only uses hot furnace smoke wind and does not use cold furnace smoke wind at present.
Meanwhile, the problem that the pipeline is corroded due to the fact that fire extinguishing steam needs to be started to discharge air in the coal mill in the original normal starting and stopping mode is solved, water generated after fire extinguishing steam is condensed can cause coal powder to agglomerate after being mixed with coal powder, the phenomenon that the operation current of the spiral powder conveyor is too large or even trips, powder feeding of the powder conveyor is not smooth and the like is caused, and the problem can be avoided by controlling oxygen content after hot furnace smoke air is used.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1. hot-furnace smoke air pipe, 2, cold-furnace smoke air pipe, 3, furnace smoke air pipeline, 4, low-temperature superheater, 5, A induced draft fan, 6, B induced draft fan, 7, coal mill A, 8, coal mill B, 9, coal mill C, 10, coal mill D, 1-1, electric damper for inlet of furnace smoke air fan to B, 1-2, electric damper for inlet of furnace smoke air fan to A, 2-1, electric damper for inlet of furnace smoke air fan to B, 2-2, electric damper for inlet of furnace smoke air fan to A, 2-3, electric damper for main pipe of cold-furnace smoke air, 3-1, electric damper for inlet furnace smoke air door of coal mill, 3-2, electric damper for inlet of furnace smoke air fan to adjacent furnace hot-air pipe, 3-3, electric damper for outlet of furnace smoke air fan to B, 3-4, and electric damper for outlet of furnace smoke air fan to A.
The specific implementation mode is as follows:
example 1:
the utility model provides a thermal power plant powder process system stove flue gas structure which constitutes and includes: hot stove cigarette tuber pipe 1, cold stove cigarette tuber pipe 2, stove cigarette tuber pipe 3, low temperature over heater 4, A draught fan 5, B draught fan 6 and coal pulverizer, the export flue of low temperature over heater on be connected with hot stove cigarette tuber pipe, A draught fan with the mixed flue of export of B draught fan on be connected with cold stove cigarette tuber pipe, a set of the entry pipeline of coal pulverizer on be connected with stove cigarette tuber pipe way, stove cigarette tuber pipe respectively with hot stove cigarette tuber pipe with cold stove cigarette tuber pipe connect, a set of the coal pulverizer include coal pulverizer A7, coal pulverizer B8, coal pulverizer C9 and coal pulverizer D10.
Example 2:
according to embodiment 1, the furnace flue gas duct structure of the powder process system of the thermal power plant is correspondingly connected with a group of coal mill inlet furnace flue gas air door electric adjusting doors 3-1, an adjacent furnace hot air pipe furnace flue gas electric gate plate door 3-2, an A furnace flue gas fan outlet electric gate plate door 3-4 and a B furnace flue gas fan outlet electric gate plate door 3-3.
Example 3:
according to embodiment 1 or 2, the furnace flue gas duct structure of the pulverizing system of the thermal power plant is characterized in that the furnace flue gas duct is connected with an electric adjusting door 1-2 at an inlet of a furnace flue gas blower A and an electric adjusting door 1-1 at an inlet of a furnace flue gas blower B.
Example 4:
according to embodiment 1 or 2 or 3, the furnace flue gas duct structure of the pulverizing system of the thermal power plant is characterized in that the cooling furnace flue gas duct is connected with an electric damper 2-2 at an inlet of a furnace flue gas blower A, an electric damper 2-1 at an inlet of a furnace flue gas blower B and an electric damper 2-3 at a main pipe of the cooling furnace flue gas blower.
Example 5:
the working principle is as follows:
the coal pulverizing system is prevented from exploding when high-volatile bituminous coal is ground, the coal pulverizing system is subjected to heat extraction and transformation of reducing the oxygen concentration of the coal pulverizing system by cold furnace smoke, namely, a drying medium of the coal pulverizing system adopts a mixed medium of the furnace smoke and hot air, wherein the hot furnace smoke is extracted at a position on an outlet flue of a low-temperature superheater, the cold furnace smoke is extracted at a position on an outlet mixed flue of two draught fans, wherein a #1 furnace is close to a 1A induced draft fan side, a #2 furnace is close to a 2B induced draft fan side, and after the temperature of the hot and cold furnace smoke is reduced, the hot and cold furnace smoke is pressurized by a furnace smoke fan and enters a coal mill, so that the oxygen concentration of the coal pulverizing system is reduced to be below 11%. In the powder making system, the furnace smoke is used as one of main drying media to provide the functions of drying, conveying and inert atmosphere, the furnace smoke is mainly used as the drying and conveying media during the grinding of coal, the outlet temperature of a coal mill is mainly controlled to be 200-250 ℃ by the temperature of cold and hot furnace smoke mixed furnace smoke, and the outlet temperature is adjusted by a mill inlet furnace smoke adjusting door; the hot air at the inlet of the coal mill is mainly used for controlling the negative pressure and the oxygen amount at the inlet of the coal mill and finely adjusting the temperature at the outlet of the coal mill. The oxygen content of the mill inlet is controlled to be less than 11% in operation, the temperature of the mill outlet is controlled to be below 80 ℃, a mill inlet hot air door is opened as large as possible to reduce the smoke exhaust temperature on the premise of meeting the requirements of powder making output and explosion prevention, and the pressure cold air of the original boiler is closed.
Claims (4)
1. The utility model provides a thermal power plant powder process system stove flue gas structure which constitutes and includes: hot stove cigarette tuber pipe, cold furnace cigarette tuber pipe, stove cigarette wind pipeline, low temperature over heater export flue, A draught fan, B draught fan, coal pulverizer entry stove cigarette wind pipeline, characterized by: the outlet flue of the low-temperature superheater is connected with the hot furnace smoke air pipe, the A draught fan and the B draught fan outlet mixed flue are connected with the cold furnace smoke air pipe, the A draught fan is connected with the furnace smoke air pipe, the furnace smoke air pipe is connected with the cold furnace smoke air pipe, the coal pulverizer comprises a coal pulverizer A, a coal pulverizer B, a coal pulverizer C and a coal pulverizer D.
2. The furnace flue structure of a pulverizing system of a thermal power plant as claimed in claim 1, wherein: the furnace smoke air pipeline is correspondingly connected with a group of coal mill inlet furnace smoke air door electric adjusting doors, an adjacent furnace hot air pipe furnace smoke air electric flashboard door, an A furnace smoke fan outlet electric flashboard door and a B furnace smoke fan outlet electric flashboard door.
3. The furnace flue structure of a pulverizing system of a thermal power plant as claimed in claim 1 or 2, wherein: and the hot furnace smoke air pipe is connected with an electric adjusting door at the inlet of a furnace smoke fan A and an electric adjusting door at the inlet of a furnace smoke fan B.
4. The furnace flue structure of a pulverizing system of a thermal power plant as claimed in claim 1 or 2, wherein: and the cooling furnace smoke air pipe is connected with an electric adjusting door to an inlet of a furnace smoke fan A, an electric adjusting door to an inlet of a furnace smoke fan B and an electric flashboard door to a cooling furnace smoke air main pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121514419.0U CN215489827U (en) | 2021-07-05 | 2021-07-05 | Smoke wind structure of powder making system of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121514419.0U CN215489827U (en) | 2021-07-05 | 2021-07-05 | Smoke wind structure of powder making system of thermal power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215489827U true CN215489827U (en) | 2022-01-11 |
Family
ID=79724511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121514419.0U Withdrawn - After Issue CN215489827U (en) | 2021-07-05 | 2021-07-05 | Smoke wind structure of powder making system of thermal power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215489827U (en) |
-
2021
- 2021-07-05 CN CN202121514419.0U patent/CN215489827U/en not_active Withdrawn - After Issue
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20220111 Effective date of abandoning: 20240301 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20220111 Effective date of abandoning: 20240301 |