CN214286368U - Medium speed coal mill fire extinguishing system based on low temperature flue gas is as fire extinguishing medium - Google Patents
Medium speed coal mill fire extinguishing system based on low temperature flue gas is as fire extinguishing medium Download PDFInfo
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- CN214286368U CN214286368U CN202022787339.4U CN202022787339U CN214286368U CN 214286368 U CN214286368 U CN 214286368U CN 202022787339 U CN202022787339 U CN 202022787339U CN 214286368 U CN214286368 U CN 214286368U
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Abstract
The embodiment of the utility model discloses intermediate speed coal pulverizer fire extinguishing systems based on low temperature flue gas is as fire extinguishing medium, including low temperature flue gas pressure boost wind channel, flue gas booster fan export electrically operated gate, the female pipe of flue gas of putting out a fire, coal pulverizer flue gas fire extinguishing electrically operated gate, low temperature flue gas pressure boost wind channel is connected flue gas booster fan and boiler draught fan export flue, flue gas booster fan export electrically operated gate, the female pipe of flue gas of putting out a fire, coal pulverizer flue gas fire extinguishing electrically operated gate connect gradually, coal pulverizer flue gas fire extinguishing electrically operated gate is connected to the scraper layer of coal pulverizer. By adopting the utility model, the low-temperature flue gas is used as the fire extinguishing medium, the temperature is greatly lower than that of steam, the fire extinguishing device has stronger fire extinguishing capability, drainage is not needed, the time required for putting the fire extinguishing steam is short, the delay of the fire extinguishing action is short, and the excessive thermal stress generated in the coal mill can be effectively prevented; on the other hand, moisture is not brought into the hearth, and deterioration combustion is avoided.
Description
Technical Field
The utility model relates to a coal pulverizer fire extinguishing systems especially relates to a medium speed coal pulverizer fire extinguishing systems based on low temperature flue gas is as fire extinguishing medium.
Background
In recent years, due to the structural innovation of electric power energy, a load peak regulation role is played in a thermal power generating unit optimized by a power grid structure, the peak regulation enables the coal consumption of power supply of the thermal power generating unit to be increased, the generating cost of the unit to be increased and the profit rate to be reduced, the increase of the generating cost brought by the coal consumption is reduced, purchasing and burning low-price coal is an effective means for effectively controlling the increase of the generating cost, the low-price coal is mainly lignite with high volatile components, if the coal mill type is changed to adapt to the coal, the investment cost is huge, but the safety performance and the reliability of the medium-speed coal mill are examined by the characteristics of inflammable and explosive coal, and therefore, the optimization becomes an inevitable requirement for adapting to the current situation at present by adopting a certain technical measure.
The current technical means for preventing the coal mill from firing is to feed steam into the coal mill for fire extinguishing under the condition of high temperature interlocking protection of the coal mill. The essence of the method is that when the temperature of the coal mill is higher than the set temperature, fire extinguishing steam is automatically put into the coal mill, so that the internal oxygen content of the coal mill is reduced, and the ignition heat of the coal mill is reduced. The main disadvantages of this fire extinguishing apparatus are:
1. the steam medium has high temperature, which is not beneficial to extinguishing fire.
2. Before the fire extinguishing steam is put into use, the pipeline needs to be drained, otherwise, the pipeline is strongly vibrated, cracks are easily generated at the weak position of the pipeline to cause leakage, equipment damage is caused, and the personal safety of local work and patrol personnel is threatened.
3. Because the pipeline is not thoroughly drained, water is brought into the coal mill, and excessive thermal stress is generated alternately by cold and hot water to cause damage to equipment of the coal mill.
4. After the steam is condensed, moisture is generated and is brought into a hearth by a powder making system, combustion of the hearth is deteriorated, and the harm of rising of the exhaust gas temperature and the like is caused.
5. The field experience shows that the ignition frequency and the ignition severity of the coal mill cannot be effectively controlled even if fire extinguishing steam is put into the coal mill when high-volatile coal is used.
6. This solution has a significantly shorter plate for preventing explosion of the coal mill.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem that will solve provides a medium speed coal pulverizer fire extinguishing systems based on low temperature flue gas is as fire extinguishing medium. Can let the medium speed pulverizer burn when high volatile matter coal type, can effectively restrain the coal pulverizer and catch fire, when coal-fired volatile matter is high to a certain extent simultaneously, can adopt the flue gas to accompany and burn, effectively reduce the probability and the number of times that the powder process system takes place to explode, finally realize the security and the reliability of medium speed pulverizer operation, reduce equipment damage, reduce the equipment maintenance cost.
In order to solve the technical problem, the embodiment of the utility model provides a novel fire extinguishing systems of intermediate speed coal pulverizer based on low temperature flue gas is as fire extinguishing medium, including low temperature flue gas pressure boost wind channel, flue gas booster fan export electrically operated gate, the female pipe of flue gas of putting out a fire, coal pulverizer flue gas fire extinguishing electrically operated gate, low temperature flue gas pressure boost wind channel is connected flue gas booster fan and boiler draught fan export flue, flue gas booster fan export electrically operated gate, the female pipe of flue gas of putting out a fire, coal pulverizer flue gas fire extinguishing electrically operated gate connect gradually, coal pulverizer flue gas fire extinguishing electrically operated gate is connected to the scraper layer of coal pulverizer.
And a coal mill smoke adjusting door is arranged between the scraper layer of the coal mill and the coal mill smoke fire extinguishing electric door.
Wherein, the export of coal pulverizer is provided with export wind pressure sensor and export wind temperature sensor.
The coal pulverizer also comprises a cold and hot air mixing pipeline, a cold air pipeline and a hot air pipeline, wherein the cold and hot air mixing pipeline is connected to a primary air inlet of the coal pulverizer, the cold air pipeline is connected to the cold and hot air mixing pipeline through a cold air electric door and a cold air adjusting door, and the hot air pipeline is connected to the cold and hot air mixing pipeline through a hot air electric door and a hot air adjusting door.
Wherein, the cold and hot air mixing pipeline is provided with a primary air pressure sensor.
Wherein, still include fire extinguishing systems control module, its with flue gas booster fan, flue gas booster fan export electrically operated gate, coal pulverizer flue gas fire extinguishing electrically operated gate, coal pulverizer flue gas adjusting gate, export wind pressure sensor, export wind temperature sensor, cold wind electrically operated gate, cold wind adjusting gate, hot-blast electrically operated gate, hot-blast adjusting gate, a wind pressure sensor electricity are connected.
The fire extinguishing system comprises a grinding disc of the coal mill, a pressure difference transmitter connected to the upper portion and the lower portion of the grinding disc of the coal mill, and the pressure difference transmitter is connected to the fire extinguishing system control module.
Implement the embodiment of the utility model provides a, following beneficial effect has: the utility model has the advantages that the low-temperature flue gas is used as the fire extinguishing medium, the temperature is greatly lower than that of steam, the fire extinguishing capacity is stronger, the drainage is not needed, the time required for putting the fire extinguishing steam is short, the delay of the fire extinguishing action is short, and compared with a steam fire extinguishing system, on one hand, the system can not bring moisture into a coal mill, and the excessive thermal stress generated in the coal mill can be effectively prevented; on the other hand, moisture is not brought into the hearth, and deterioration combustion is avoided.
Drawings
FIG. 1 is a schematic view of the structure of the pipes connected to the front of the coal pulverizer;
FIG. 2 is a schematic view of the piping structure to which the coal pulverizer is connected.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the utility model discloses a medium speed coal pulverizer fire extinguishing systems based on low temperature flue gas is as fire extinguishing medium, including low temperature flue gas booster air duct 1, flue gas booster fan 2, flue gas booster fan export electrically operated gate 3, the female pipe of flue gas of putting out a fire 5, the electrically operated gate of coal pulverizer flue gas fire extinguishing.
Low temperature flue gas pressure boost wind channel 1 is connected flue gas booster fan 2 and boiler draught fan export flue, flue gas booster fan 3, flue gas booster fan export electrically operated gate 3, the flue gas total flow meter 4 of putting out a fire, the flue gas main pipe 5 of putting out a fire, coal pulverizer flue gas fire extinguishing electrically operated gate 7 connect gradually, coal pulverizer flue gas fire extinguishing electrically operated gate 7, coal pulverizer flue gas adjustment door 8, coal pulverizer flue gas flowmeter 9, the scraper blade layer 10 of coal pulverizer connect gradually.
And a fire extinguishing smoke main pipe pressure sensor 6 is arranged on the fire extinguishing smoke main pipe 5.
The extraction boiler draught fan export flue partly low temperature flue gas is as the flue gas of putting out a fire, improves pressure through flue gas booster fan 2, sends the scraper blade layer 10 to the coal pulverizer through the flue gas of putting out a fire main pipe 5, and the independent flue gas of putting out a fire of every coal pulverizer of accessible adjusts the flue gas volume size.
And a scraper layer inlet flue gas pressure sensor 11 is arranged on a pipeline connected between the coal mill flue gas flowmeter 9 and the scraper layer 10 of the coal mill.
An outlet wind pressure sensor 12 and an outlet wind temperature sensor 13 are arranged at the outlet of the coal mill. The outlet wind pressure sensor 12 and the outlet wind temperature sensor 13 are both arranged in a pair and used for detecting whether the pulverized coal is spontaneously combusted.
The embodiment of the utility model provides a still including the cold and hot wind mixed pipeline 14, the cold wind pipeline 15, the hot-blast pipeline 16 that are connected to the primary air entry of coal pulverizer, cold wind pipeline is connected to cold and hot wind mixed pipeline through cold wind power door 17, cold wind adjustment door 18, and hot-blast pipeline 16 is connected to cold and hot wind mixed pipeline 14 through hot-blast electrically operated gate 19, hot-blast adjustment door 20.
The cold and hot air mixing pipeline is provided with a primary air pressure sensor 21.
The cold and hot air mixing pipeline 14 is also provided with a cold and hot air mixing thermometer 22 and a coal mill inlet primary air gauge 23.
The embodiment of the utility model provides a still include fire extinguishing systems control module, it is connected with flue gas booster fan, flue gas booster fan export electrically operated gate, coal pulverizer flue gas fire extinguishing electrically operated gate, coal pulverizer flue gas adjustment door, export wind pressure sensor, export wind temperature sensor, cold wind electrically operated gate, cold wind adjustment door, hot-blast electrically operated gate, hot-blast adjustment door, a wind pressure sensor, scraper blade layer entry flue gas pressure sensor, pressure differential transmitter electricity.
The pressure difference transmitter 24 is connected to the upper and lower parts of the grinding disc of the coal mill and measures the upper and lower pressure difference of the grinding disc.
After the fire extinguishing system control module analyzes according to the data acquisition result, when a set condition is reached, the fire extinguishing system is automatically started to extinguish fire towards the fire coal mill: starting the smoke booster fan, opening the smoke booster fan outlet electric door, opening the coal mill smoke fire extinguishing electric door, and simultaneously automatically opening the coal mill smoke adjusting door to extinguish fire to the fire coal mill according to the temperature change of the coal mill outlet. And when the coal mill successfully extinguishes the fire, immediately stopping the operation of the fire extinguishing system.
The utility model discloses an in the scheme, adopt the low temperature flue gas as the medium of putting out a fire, select the draught fan export as the point of bleeding (low oxygen low temperature flue gas), the flue gas temperature is about 130 ℃, utilizes booster fan to send the flue gas to each coal pulverizer and puts out a fire, when reaching the fire extinguishing conditions, can send each part of fire extinguishing systems with the protection instruction rapidly, realizes the promptness of putting out a fire.
The change rate of the primary air pressure at the inlet of the coal mill is over-limited and the change rate of the pressure difference between the upper part and the lower part of the upper grinding bowl is over-limited under the condition 1; 2, the change rate of the air pressure of the air-powder mixture outlet of the coal mill exceeds the limit and the change rate of the differential pressure between an upper grinding bowl and a lower grinding bowl of the upper coal mill exceeds the limit; and 3, the air temperature at the outlet of the coal mill is over-limit. Any one of the above conditions is satisfied: the fire suppression system control module starts the fire protection action logic.
The logic action results in: starting the flue gas booster fan, opening the flue gas booster fan export electrically operated gate, opening the coal pulverizer flue gas electrically operated gate of putting out a fire, automatically sending pulse signal and opening the flue gas adjusting gate to certain aperture, send pulse instruction simultaneously and open coal pulverizer cold wind adjusting gate entirely, close hot-blast accent door.
And a cold and hot air mixing thermometer 22, a coal mill inlet primary air gauge 23, a coal mill flue gas flow meter 9 and a scraper layer inlet flue gas pressure sensor 11 are used for monitoring, and if the interlocking is abnormal, the system can be manually controlled through parameters shown by the coal mill.
The utility model has the advantages of as follows:
1. the low-temperature flue gas is used as a fire extinguishing medium, the temperature is greatly lower than that of steam, and the fire extinguishing capacity is stronger.
2. The utility model discloses need not carry out hydrophobic, the required time of dropping into the steam of putting out a fire is few, and the action delay of putting out a fire is short.
3. Compared with a steam fire extinguishing system, on one hand, the system can not bring moisture into the coal mill, and can effectively prevent the internal of the coal mill from generating excessive thermal stress; on the other hand, moisture is not brought into the hearth, and deterioration combustion is avoided.
4. The fire extinguishing system control module ensures the immediacy and rapidity of fire extinguishing protection investment and the editable protection setting.
5. Has stronger explosion suppression effect on a pulverizing system.
In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and all the equivalent or simple changes made according to the structure, the features and the principle of the present invention are included in the protection scope of the present invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (7)
1. The utility model provides an intermediate speed coal pulverizer fire extinguishing systems based on low temperature flue gas is as fire extinguishing medium, a serial communication port, include low temperature flue gas pressure boost wind channel, flue gas booster fan export electrically operated gate, the female pipe of flue gas of putting out a fire, coal pulverizer flue gas fire extinguishing electrically operated gate, low temperature flue gas pressure boost wind channel is connected flue gas booster fan and boiler draught fan export flue, flue gas booster fan export electrically operated gate, the female pipe of flue gas of putting out a fire, coal pulverizer flue gas fire extinguishing electrically operated gate connect gradually, coal pulverizer flue gas fire extinguishing electrically operated gate is connected to the board layer of scraping of coal pulverizer.
2. A medium speed coal mill fire extinguishing system based on low temperature flue gas as fire extinguishing medium according to claim 1, characterized in that a coal mill flue gas adjusting door is arranged between the scraper layer of the coal mill and the coal mill flue gas fire extinguishing electric door.
3. A medium speed coal mill fire extinguishing system based on low temperature flue gas as fire extinguishing medium according to claim 2 is characterized in that the outlet of the coal mill is provided with an outlet wind pressure sensor and an outlet wind temperature sensor.
4. The medium speed coal mill fire extinguishing system based on low-temperature smoke as a fire extinguishing medium according to claim 3, further comprising a cold and hot air mixing pipeline, a cold air pipeline and a hot air pipeline which are connected to a primary air inlet of the coal mill, wherein the cold air pipeline is connected to the cold and hot air mixing pipeline through a cold air electric door and a cold air adjusting door, and the hot air pipeline is connected to the cold and hot air mixing pipeline through a hot air electric door and a hot air adjusting door.
5. A medium speed coal mill fire extinguishing system based on low temperature flue gas as fire extinguishing medium according to claim 4, characterized in that the cold and hot air mixing pipeline is provided with a primary air pressure sensor.
6. The medium speed coal mill fire extinguishing system based on low temperature flue gas as fire extinguishing medium according to claim 5, further comprising a fire extinguishing system control module electrically connected with the flue gas booster fan, the flue gas booster fan outlet electric door, the coal mill flue gas fire extinguishing electric door, the coal mill flue gas adjusting door, the outlet air pressure sensor, the outlet air temperature sensor, the cold air electric door, the cold air adjusting door, the hot air electric door, the hot air adjusting door, and the primary air pressure sensor.
7. A medium speed coal mill fire extinguishing system based on low temperature flue gas as fire extinguishing medium according to claim 6, characterized by further comprising a differential pressure transmitter connected to the upper and lower parts of the grinding disc of the coal mill, wherein the differential pressure transmitter is connected to the fire extinguishing system control module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022787339.4U CN214286368U (en) | 2020-11-26 | 2020-11-26 | Medium speed coal mill fire extinguishing system based on low temperature flue gas is as fire extinguishing medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022787339.4U CN214286368U (en) | 2020-11-26 | 2020-11-26 | Medium speed coal mill fire extinguishing system based on low temperature flue gas is as fire extinguishing medium |
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| CN214286368U true CN214286368U (en) | 2021-09-28 |
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| CN202022787339.4U Active CN214286368U (en) | 2020-11-26 | 2020-11-26 | Medium speed coal mill fire extinguishing system based on low temperature flue gas is as fire extinguishing medium |
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| CN (1) | CN214286368U (en) |
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