CN210069900U - Explosion-proof purging system suitable for double-inlet and double-outlet coal mill for grinding bituminous coal - Google Patents
Explosion-proof purging system suitable for double-inlet and double-outlet coal mill for grinding bituminous coal Download PDFInfo
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- CN210069900U CN210069900U CN201920892880.6U CN201920892880U CN210069900U CN 210069900 U CN210069900 U CN 210069900U CN 201920892880 U CN201920892880 U CN 201920892880U CN 210069900 U CN210069900 U CN 210069900U
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Abstract
The utility model discloses an explosion-proof purging system suitable for milling bituminous coal by a double-inlet and double-outlet coal mill, which comprises a boiler draught fan outlet, a flue gas branch pipeline, a furnace smoke booster fan, a furnace smoke main pipe and a flue gas branch pipeline; the export of boiler draught fan is linked together through flue gas lateral conduit and stove cigarette booster fan's entry, and stove cigarette booster fan's export is linked together through the main pipe of stove cigarette with dividing the flue gas pipeline, each coal pulverizer with divide the flue gas pipeline to be linked together, the explosion-proof performance of this system is good.
Description
Technical Field
The utility model belongs to the technical field of the powder process system transformation, a explosion-proof purging system suitable for double-inlet double-outlet coal pulverizer grinds bituminous coal is related to.
Background
Because of the gradual depletion of lean coal and the increasing demand of steel plants for lean coal anthracite, many power plants which are designed to burn lean coal in the past are changing to burn high-volatile bituminous coal. For some high volatile, high calorific value, low water and low ash bituminous coals (such as Shenfu, Dongsheng coal field bituminous coals), the inlet temperature of the coal mill is required to be higher, and the outlet temperature is required to be controlled to be lower as much as possible. However, in the case of the double-in and double-out coal mill system, the coal powder fineness is difficult to control at a relatively coarse level, so that the explosion accident of the coal pulverizing system still frequently occurs.
The steel ball coal mill is suitable for milling lean coal and anthracite, and the double-inlet and double-outlet coal mill also has the case of milling bituminous coal, but a powder milling system is easy to explode without exception and is difficult to control. The fineness of the pulverized coal of the double-inlet and double-outlet coal mill can be very fine, the adaptability of the coal type is very strong, but the fineness of the pulverized coal is difficult to improve, and the fineness R of the pulverized coal ground by a power plant90Can reach below 10 percent, and is suitable for the fineness of the burning anthracite. However, the coal mill is not suitable for milling high-volatile bituminous coal, and spontaneous combustion and explosion accidents are easily caused by the fact that the pulverized coal is too fine.
In a power plant for grinding high-volatile bituminous coal by a double-inlet and double-outlet coal mill, measures which can be adopted during operation are adopted, such as purging temperature reduction, inerting steam input, cleaning dead corners of the coal mill during shutdown and the like. But the explosion probability is still high. In the situation that no effective means exists in operation adjustment and accident hidden danger still exists, the equipment or the system is necessary to be reconstructed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide an explosion-proof purge system suitable for double entry double exit coal pulverizer grinds bituminous coal, the explosion-proof performance of this system is good.
In order to achieve the purpose, the anti-explosion purging system suitable for the double-inlet and double-outlet coal mill to mill bituminous coal comprises a boiler draught fan outlet, a flue gas branch pipeline, a furnace smoke booster fan, a furnace smoke main pipe and a flue gas branch pipeline;
the export of boiler draught fan is linked together through flue gas lateral conduit and stove cigarette booster fan's entry, and stove cigarette booster fan's export is linked together through the main pipe of stove cigarette with dividing the flue gas pipeline, each coal pulverizer with divide the flue gas pipeline to be linked together.
The flue gas branch pipeline is provided with a first flue gas partition door.
And a smoke quantity adjusting door is arranged at the inlet of the furnace smoke booster fan.
A second flue gas partition door is arranged between the coal mill and the flue gas distribution pipeline.
The device also comprises detection equipment for detecting the temperature, pressure and flow of the smoke in the smoke main pipe of the furnace.
The utility model discloses following beneficial effect has:
explosion-proof purge system suitable for double-inlet double-outlet coal pulverizer grinds bituminous coal when concrete operation, adopts the stove cigarette to carry out purging of coal pulverizer, wherein, the smoke temperature is higher than the cold wind temperature, sweeps under the certain circumstances of temperature at the coal pulverizer, the flue gas volumn is greater than the cold wind volume to it is lower to ensure the interior oxygen content of coal pulverizer, in order to guarantee explosion-proof effect, stops coal pulverizer explosion accident, in addition, the utility model discloses only stop at the coal pulverizer and grind the in-process and launch, other time stop, the fan is power consumptive lower, drops into for a short time.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is flue gas branch pipeline, 2 is first flue gas and cuts off the door, 3 is flue gas volume governing valves, 4 is stove cigarette booster fan, 5 is the main pipe of stove cigarette, 6 is for dividing the flue gas pipeline, 7 is second flue gas and cuts off the door, 8 is check out test set.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the explosion-proof purging system for grinding bituminous coal with a double-inlet and double-outlet coal mill of the present invention comprises an outlet of a boiler draught fan, a branch flue gas pipeline 1, a flue gas booster fan 4, a main flue gas pipe 5 and a branch flue gas pipeline 6; the export of boiler draught fan is linked together through flue gas lateral conduit 1 and the entry of stove cigarette booster fan 4, and stove cigarette booster fan 4's export is linked together through the female pipe 5 of stove cigarette and branch flue gas pipeline 6, each coal pulverizer with divide flue gas pipeline 6 to be linked together.
A first flue gas partition door 2 is arranged on the flue gas branch pipeline 1; a flue gas quantity adjusting door 3 is arranged at the inlet of the flue gas booster fan 4; a second flue gas partition door 7 is arranged between the coal mill and the flue gas distribution pipeline 6; the utility model discloses still including the check out test set 8 that is used for detecting flue gas temperature, pressure and flow in the female pipe 5 of stove cigarette.
Flue gas output from an outlet of a boiler induced draft fan enters a furnace smoke booster fan 4 through a flue gas branch pipeline 1 and a flue gas volume adjusting door 3, is further boosted and flow-adjusted by the furnace smoke booster fan 4, then enters a cold air pipeline of a stopped coal mill through a furnace smoke main pipe 5 and a flue gas distributing pipeline 6, and is used for replacing cold air to purge the coal mill after coal is stopped; cut off door 2 and second flue gas through first flue gas and cut off door 7 and keep apart the flue gas during the coal pulverizer normal operating, only stop the in-process at the coal pulverizer and launch the utility model discloses carry out purging of coal pulverizer. In addition, during actual operation, a mode that two furnaces share one flue gas booster fan 4 is adopted, namely one furnace is used for standby, and whether a standby boiler needs to be started or not can be selected according to the temperature, the pressure and the flow of flue gas in the flue gas main pipe 5.
In actual operation, when a certain coal mill is planned or emergently stopped, the furnace smoke booster fan 4 is started to confirm that the temperature and the pressure of the furnace smoke meet the purging requirement of the coal mill; and closing a corresponding cold air door of the coal mill after opening a second smoke partition door 7 corresponding to the coal mill to gradually increase the smoke volume, reduce the hot air volume, maintain the ventilation volume and the outlet temperature of the coal mill, stop grinding and purging the coal mill, stop the smoke booster fan 4 after reaching the purging time, and close the first smoke partition door 2 and the second smoke partition door 7.
The temperature, the pressure and the flow of the flue gas in the flue gas main pipe 5 are detected through the detection equipment 8, and whether a standby boiler is started or not is selected, so that the control of the flue gas volume is realized, the stability of the inlet air volume of the coal mill in the cold air quitting process is ensured, and the temperature and the pressure are kept at reasonable levels.
Claims (5)
1. An explosion-proof purging system suitable for grinding bituminous coal by a double-inlet and double-outlet coal mill is characterized by comprising a boiler induced draft fan outlet, a flue gas branch pipeline (1), a furnace smoke booster fan (4), a furnace smoke main pipe (5) and a smoke distributing pipeline (6);
the export of boiler draught fan is linked together through the entry of flue gas lateral conduit (1) with stove cigarette booster fan (4), and the export of stove cigarette booster fan (4) is linked together through stove cigarette female pipe (5) and branch flue gas pipeline (6), each coal pulverizer with divide flue gas pipeline (6) to be linked together.
2. The explosion-proof purging system for bituminous coal grinding of a double-inlet and double-outlet coal mill as claimed in claim 1, wherein the flue gas branch pipe (1) is provided with a first flue gas blocking door (2).
3. The explosion-proof purging system for grinding bituminous coal by a double-inlet double-outlet coal mill as claimed in claim 1, wherein a flue gas amount adjusting door (3) is provided at an inlet of the flue gas booster fan (4).
4. The explosion-proof purging system for the coal grinding of the double-inlet and double-outlet coal mill as claimed in claim 2, characterized in that a second flue gas partition door (7) is arranged between the coal mill and the flue gas separating pipeline (6).
5. The explosion-proof purging system for the coal grinding of the double-inlet and double-outlet coal mill as claimed in claim 1, further comprising a detection device (8) for detecting the temperature, pressure and flow of the flue gas in the main pipe (5) of the flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920892880.6U CN210069900U (en) | 2019-06-13 | 2019-06-13 | Explosion-proof purging system suitable for double-inlet and double-outlet coal mill for grinding bituminous coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920892880.6U CN210069900U (en) | 2019-06-13 | 2019-06-13 | Explosion-proof purging system suitable for double-inlet and double-outlet coal mill for grinding bituminous coal |
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| CN210069900U true CN210069900U (en) | 2020-02-14 |
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| CN201920892880.6U Active CN210069900U (en) | 2019-06-13 | 2019-06-13 | Explosion-proof purging system suitable for double-inlet and double-outlet coal mill for grinding bituminous coal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111256107A (en) * | 2020-03-31 | 2020-06-09 | 国电南京电力试验研究有限公司 | Explosion-proof system for grinding high-volatile coal by double-inlet and double-outlet coal mill and working method |
| CN114308274A (en) * | 2021-11-08 | 2022-04-12 | 广西投资集团北海发电有限公司 | Safe operation method for BBD4060 double-inlet and double-outlet direct-blowing type steel ball-milling lignite |
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2019
- 2019-06-13 CN CN201920892880.6U patent/CN210069900U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111256107A (en) * | 2020-03-31 | 2020-06-09 | 国电南京电力试验研究有限公司 | Explosion-proof system for grinding high-volatile coal by double-inlet and double-outlet coal mill and working method |
| CN114308274A (en) * | 2021-11-08 | 2022-04-12 | 广西投资集团北海发电有限公司 | Safe operation method for BBD4060 double-inlet and double-outlet direct-blowing type steel ball-milling lignite |
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