CN113477385A - Safety pre-alarm system for coal powder preparation - Google Patents
Safety pre-alarm system for coal powder preparation Download PDFInfo
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- CN113477385A CN113477385A CN202110490112.XA CN202110490112A CN113477385A CN 113477385 A CN113477385 A CN 113477385A CN 202110490112 A CN202110490112 A CN 202110490112A CN 113477385 A CN113477385 A CN 113477385A
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- 239000000843 powder Substances 0.000 title claims abstract description 106
- 239000003245 coal Substances 0.000 title claims abstract description 74
- 238000002360 preparation method Methods 0.000 title claims abstract description 57
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000003063 flame retardant Substances 0.000 claims abstract description 49
- 238000003860 storage Methods 0.000 claims abstract description 29
- 230000001681 protective effect Effects 0.000 claims abstract description 28
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- 235000013312 flour Nutrition 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 98
- 239000000428 dust Substances 0.000 claims description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 15
- 238000011049 filling Methods 0.000 claims description 14
- 238000003801 milling Methods 0.000 claims description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 description 11
- 230000002269 spontaneous effect Effects 0.000 description 11
- 238000005457 optimization Methods 0.000 description 7
- 238000004880 explosion Methods 0.000 description 6
- 239000002817 coal dust Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
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
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention relates to a safety pre-alarm system for coal powder preparation, which comprises a coal powder preparation system consisting of a flour mill, a powder pipe and a powder storage and cleaning system which are sequentially connected, wherein the tail end of the powder storage and cleaning system is connected with an air door of the flour mill, and the safety pre-alarm system is characterized in that: and the flame-retardant protection pipe is connected between the feed inlet of the pulverizer and the tail end of the pulverized coal pipe to form a gas protection system, and the flame-retardant protection pipe is filled with flame-retardant protective gas to carry out flame-retardant protection on the two systems respectively in the gas protection system or the pulverized coal preparation system. According to the invention, the flame-retardant protection tubes are arranged at two ends of the pulverizer and the powder tube, the intelligent control of the electromagnetic valve is utilized, the whole closed-loop pulverized coal preparation system or gas protection system can be formed, and the protection gas is introduced into the two systems and is matched with the sensor for use, so that the flame-retardant and explosion-proof protection can be carried out on the two systems, the powder storage amount and whether the air door is sealed can be detected, and the whole safety pre-alarm system has the advantages of simple structure, high safety intensity and quick early warning.
Description
Technical Field
The invention belongs to the technical field of pulverized coal production, and particularly relates to a pulverized coal preparation safety pre-alarm system.
Background
The preparation of the coal powder takes raw coal as raw material, the raw coal is conveyed to a raw coal bin through a coal yard, the raw coal is fed into a coal grinding device, and the raw coal is finally collected into the coal powder bin through a coal powder dust collector after being ground and is used as rotary kiln calcination fuel for storage. Because of the inherent characteristics of coal, spontaneous combustion and explosion can be generated in the coal powder preparation process, and the direct reason for the spontaneous combustion and explosion is as follows:
1. powder is stored in the coal mill, when the coal mill is normally stopped, the powder stored in the mill and the powder pipe is not completely blown out in time, and spontaneous combustion or explosion can occur when the coal mill is started again or stopped;
2. the air door of the coal mill is not closed tightly, and the like.
For the powder storage detection and the air door detection, a pre-alarm system which can simultaneously test the powder storage detection and the air door detection and can not directly prevent spontaneous combustion and explosion does not exist.
Disclosure of Invention
The invention aims to solve the problems and provide a coal powder preparation safety pre-alarm system which can simultaneously detect stored powder and an air door and prevent spontaneous combustion and explosion.
The invention realizes the purpose through the following technical scheme:
the utility model provides a buggy preparation safety alarm system in advance, includes by milling machine, powder pipe that connect gradually and deposit the buggy preparation system that whitewashed clearance system constitutes, deposit whitewashed clearance system tail end and milling machine air door and be connected its characterized in that: a flame-retardant protection pipe is connected between the feed inlet of the pulverizer and the tail end of the pulverized coal pipe to form a gas protection system, and flame-retardant protection gas is filled into the flame-retardant protection pipe to the gas protection system or the pulverized coal preparation system to respectively carry out flame-retardant protection on the two systems;
the flame-retardant protection tube is internally provided with a gas flow sensor and a gas pressure sensor which are used for monitoring the flow of protective gas, the gas charging time and the gas pressure in the two systems respectively, the output ends of the gas flow sensor and the gas pressure sensor are connected with a pre-alarm system, and the pre-alarm system calculates the powder storage amount and detects whether the air door is sealed according to the sectional area of the flame-retardant protection tube, the gas flow, the gas charging time and the gas pressure and gives an alarm according to the detection data.
As a further optimization scheme of the invention, a feeding pipe is connected at a feeding port of the flame-retardant protection pipe, a first electromagnetic valve is arranged on the feeding pipe, an inlet of the feeding pipe is connected with a dryer, and an inlet of the dryer is connected with a feeding machine.
As a further optimization scheme of the invention, the flame-retardant protective pipe is connected with a gas tank through a pipeline and an inflator pump, and flame-retardant protective gas is loaded in the gas tank and is carbon dioxide gas or inert gas.
As a further optimization scheme of the invention, the stored powder cleaning system comprises a dust collector, an air pipe and an air heater, wherein the dust collector is connected with a powder pipe, a second electromagnetic valve is arranged at the position where the powder pipe is connected with the dust collector, the air pipe is connected with the dust collector and an air door of a flour mill, one end of the air pipe is connected with the air heater through a hot air electromagnetic valve, and one end of the air pipe, which is connected with the air door of the flour mill, is provided with a cold air electromagnetic valve.
As a further optimization scheme of the invention, the pre-alarm system comprises a central processing unit, a primary alarm device and a secondary alarm device, wherein the central processing unit receives air pressure, nitrogen filling flow speed and nitrogen filling time information in the pulverized coal preparation system, which is detected by an air flow sensor and an air pressure sensor, judges the stored powder amount of the pulverizer and the sealing degree of the air door according to the information and the sectional area of the flame-retardant protection tube, and controls the primary alarm device/the secondary alarm device to alarm when the stored powder amount reaches a set threshold value and the air door is not sealed.
As a further optimization scheme of the invention, the primary alarm device and the secondary alarm device adopt different alarms or send different alarm signals to a supervisor terminal.
A method for carrying out safety pre-alarming by a coal powder preparation safety pre-alarming system comprises the following steps:
before the coal powder preparation system is put into use, a central processing unit controls the first electromagnetic valve, the second electromagnetic valve and the cold air electromagnetic valve to be closed, an inflator pump is started to fill protective gas into the flame-retardant protection pipe, the pulverizer and the powder pipe to form a gas protection system, a gas flow sensor and a gas pressure sensor detect the pressure, the nitrogen filling flow rate and the nitrogen filling time in the pulverizer and the powder pipe, and the original volume in the gas protection system is calculated according to the sectional area of the flame-retardant protection pipe;
after the pulverized coal preparation system is put into use and before the pulverizer stops running, the central processing unit controls to close the first electromagnetic valve, open the cold air electromagnetic valve and the exhaust fan, blow the gas filtered and exhausted by the dust collector into the pulverizer to blow up the stored powder in the pulverizer and the powder pipe, clean and output the gas to the dust collector;
step three, after the powder storage is cleaned for a period of time, repeating the step one, calculating to obtain the volume in the used gas protection system, wherein the difference between the volume and the original volume calculated in the step one is the powder storage volume, judging whether the air door is sealed according to the pressure change value, and controlling a primary alarm device to alarm by a central processing unit when the powder storage amount reaches a set threshold value and the air door is not sealed;
and step four, when the alarm is still given out after the air door is checked to be sealed, and the powder storage amount still reaches the set threshold value after the step two is repeated, the central processing unit controls the secondary alarm device to give an alarm for manual maintenance.
As a further optimization scheme of the invention, the protective gas is not stopped during the alarming period in the third step and the fourth step, after the alarming, the central controller controls the second electromagnetic valve and the cold air electromagnetic valve to be opened, the exhaust fan is started to carry out the work of powder storage and cleaning again, the protective gas is filled into the whole pulverized coal preparation system to carry out flame-retardant and explosion-proof protection, after the alarming is stopped, the pulverizer is stopped, and the protective gas is filled into the whole pulverized coal preparation system until the pulverizer is started again.
As a further optimization scheme of the invention, in the first step and the second step, the electromagnetic valve I is only closed, the size change in the whole coal powder preparation system is detected after the inflator pump is started, and the detected powder storage amount in the whole coal powder preparation system is obtained for subsequent cleaning.
The invention has the beneficial effects that:
1) the flame-retardant protection tubes are arranged at the two ends of the pulverizer and the powder tube, the intelligent control of the electromagnetic valve is utilized, the whole closed-loop coal powder preparation system or the gas protection system can be formed, the protection gas is introduced into the two systems and is matched with the gas flow sensor and the air pressure sensor for use, the flame-retardant and explosion-proof protection can be carried out on the two systems, the volume and the pressure in the two systems can be detected, the powder storage amount and whether the air door is sealed can be judged by utilizing the volume difference and the pressure change numerical value before and after use, and the whole safety pre-alarm system is simple in structure, high in safety intensity and quick in early warning;
2) the invention can protect the whole coal dust preparation system by introducing the gas for preventing the spontaneous combustion of the coal dust before the shutdown and the start of the pulverizer, has stronger protection, and can isolate the dust collector when only the gas protection system is protected, thereby preventing the dust collector from being burnt and damaged by the spontaneous combustion of the coal dust.
Drawings
FIG. 1 is a schematic structural view of a pulverized coal production system according to the present invention;
FIG. 2 is a schematic diagram of the pre-warning system of the present invention;
in the figure: 1. a flame-retardant protection tube; 2. a gas flow sensor; 3. an air pressure sensor; 4. a feed pipe; 5. a pulverizer; 6. a powder tube; 7. a dust collector; 8. an air duct; 9. an exhaust fan; 10. a central processing unit; 11. a primary alarm device; 12. a secondary alarm device; 13. a dryer; 14. a feeding machine; 15. a first electromagnetic valve; 16. a second electromagnetic valve; 17. an inflator pump; 18. a gas tank; 19. a hot air solenoid valve; 20. a hot air blower; 21. a cold air electromagnetic valve; 22. and a supervisor terminal.
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
Example 1
As shown in fig. 1-2, a buggy preparation safety warning system in advance includes by milling machine (5), powder pipe (6) that connect gradually and deposit the buggy preparation system that whitewashed clearance system constitutes, it is connected with milling machine (5) air door to deposit whitewashed clearance system tail end, it includes dust collector (7), tuber pipe (8), air heater (20) to deposit whitewashed clearance system, dust collector (7) are connected with powder pipe (6), the position that powder pipe (6) are connected with dust collector (7) sets up No. two solenoid valve (16), dust collector (7) and dust collector (5) air door are connected in tuber pipe (8), air heater (20) are connected through hot-blast solenoid valve (19) to tuber pipe (8) one end, the one end that tuber pipe (8) and milling machine's (5) air door are connected is provided with cold wind solenoid valve (21), its characterized in that: a flame-retardant protection tube (1) is connected between the feed inlet of the pulverizer (5) and the tail end of the powder tube (6) to form a gas protection system, and flame-retardant protection gas is filled into the flame-retardant protection tube (1) to the gas protection system or the pulverized coal preparation system to respectively carry out flame-retardant protection on the two systems;
the feeding port of the flame-retardant protection tube (1) is connected with a feeding tube (4), a first electromagnetic valve (15) is arranged on the feeding tube (4), the inlet of the feeding tube (4) is connected with a dryer (13), and the inlet of the dryer (13) is connected with a feeding machine (14);
the flame-retardant protection tube (1) is connected with a gas tank (18) through a pipeline and an inflator pump (17), flame-retardant protective gas is loaded in the gas tank (18), and the gas is carbon dioxide gas or inert gas;
the gas flow sensor (2) and the gas pressure sensor (3) which are used for monitoring the flow of protective gas, the gas filling time and the gas pressure in the two systems respectively are arranged in the flame-retardant protective tube (1), the output ends of the gas flow sensor (2) and the gas pressure sensor (3) are connected with the pre-alarm system, the pre-alarm system calculates the powder storage amount and detects whether the air door is sealed according to the sectional area, the gas flow, the gas filling time and the gas pressure of the flame-retardant protective tube (1), and the pre-alarm system alarms according to the detection data;
the pre-alarm system comprises a central processing unit (10), a primary alarm device (11) and a secondary alarm device (12), wherein the central processing unit (10) receives air pressure, nitrogen charging flow rate and nitrogen charging time information in the pulverized coal preparation system, which is detected by an air flow sensor (2) and an air pressure sensor (3), judges the stored powder amount and the air door sealing degree of the pulverizer (5) according to the information and the sectional area of the flame-retardant protection tube (1), and controls the primary alarm device (11)/the secondary alarm device (12) to alarm when the stored powder amount reaches a set threshold value and the air door is not sealed; the primary alarm device (11) and the secondary alarm device (12) adopt different alarms or send different alarm signals to a supervisor terminal (22).
The method for carrying out safety pre-alarming by adopting the coal powder preparation safety pre-alarming system comprises the following steps:
before the coal powder preparation system is put into use, a central processing unit (10) controls the first electromagnetic valve (15), the second electromagnetic valve (16) and the cold air electromagnetic valve (21) to be closed, an inflator pump (17) is started to fill protective gas into the flame-retardant protective tube (1), the pulverizer (5) and the powder tube (6) to form a gas protection system, a gas flow sensor (2) and a gas pressure sensor (3) are used for detecting the pressure, the nitrogen filling flow rate and the nitrogen filling time in the pulverizer (5) and the powder tube (6), and the original volume in the gas protection system can be calculated according to the sectional area of the flame-retardant protective tube (1), the nitrogen filling flow rate and the nitrogen filling time;
after the pulverized coal preparation system is put into use and before the pulverizer 5 is stopped, the central processing unit 10 controls the first electromagnetic valve 15 to be closed, the cold air electromagnetic valve 21 and the exhaust fan 9 are started, gas filtered and exhausted by the dust collector 7 is blown into the pulverizer 5 to blow up powder stored in the pulverizer 5 and the powder pipe 6, and the powder is cleaned and output to the dust collector 7;
step three, after the powder storage is cleaned for a period of time, repeating the step one, calculating to obtain the volume in the used gas protection system, wherein the difference between the volume and the original volume calculated in the step one is the powder storage volume, comparing the pressure change value of the time according to the pressure change value detected in the step one to judge whether the air door is sealed, and controlling a primary alarm device 11 to give an alarm by a central processing unit 10 when the powder storage amount reaches a set threshold value and the air door is not sealed, wherein the primary alarm device 11 can adopt a buzzer alarm or send primary alarm information to a supervisor terminal 22;
step four, when the alarm is still given after the air door is sealed, and the powder storage amount still reaches the set threshold value after the step two is repeated, the central processing unit 10 controls the secondary alarm device 12 to give an alarm, so that a supervisor can be reminded of carrying out manual maintenance conveniently, and the secondary alarm device 12 can adopt an audible and visual alarm or send secondary alarm information to the supervisor terminal 22.
And in the third step and the fourth step, the conveying of the protective gas is not stopped during the alarming period, the central controller controls the second electromagnetic valve 16 and the cold air electromagnetic valve 21 to be opened after the alarming, the exhaust fan 9 is started to carry out the work of powder storage and cleaning again, the protective gas is filled into the whole coal powder preparation system to carry out flame-retardant and explosion-proof protection, after the alarming is stopped, the pulverizer 5 is stopped, and the protective gas is filled into the whole coal powder preparation system until the pulverizer 5 is started again.
In the first step and the second step, the electromagnetic valve 15I is only closed, the inflator pump 17 is started, and then the volume change in the whole coal powder preparation system is detected, so that the powder storage amount in the whole coal powder preparation system can be detected, the whole coal powder preparation system can be cleaned regularly according to the powder storage amount value, for example, the interiors of the dust collector 7 and the pulverizer 5 are cleaned, the service life of the coal powder preparation system is prolonged, and the spontaneous combustion and explosion probability of the coal powder preparation system is reduced.
It should be noted that: when the coal powder preparation system is used for preparing coal powder, the coal slag is conveyed to the dryer 13 by the feeding machine 14 for drying, and the dried coal slag is not easy to stick to the wall after being ground into powder and cannot influence the volume detection precision due to moisture; the dried coal slag enters a pulverizer 5 through a feeding pipe 4 to be pulverized, then is conveyed to a dust collector 7 through a powder pipe 6 under the action of an exhaust fan 9, is conveyed to a finished product bin after being subjected to centralized filtration treatment by the dust collector 7, and the extracted and filtered gas is conveyed to the pulverizer 5 through an air pipe 8 to be subjected to cold air blowing to clean residual dust, and the steps are repeated again to be subjected to collection treatment after the residual dust is blown up; after the stored powder is cleaned, spontaneous combustion can be avoided at the moment of shutdown and startup of the pulverizer 5.
Before the pulverizer 5 is stopped and started, gas for preventing pulverized coal from spontaneously combusting can be introduced to protect the whole pulverized coal preparation system, the protective gas can be carbon dioxide gas, nitrogen or other inert gases, and a gas protection system formed by the flame-retardant protective tube 1, the pulverizer 5 and the powder tube 6 can be only protected by controlling the opening and closing of the electromagnetic valve, because structures such as filter cloth in the dust collector 7 are extremely easy to ignite, but spontaneous combustion cannot easily occur, the dust collector 7 is isolated, and the dust collector 7 is prevented from being burnt and damaged due to spontaneous combustion of pulverized coal.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (9)
1. The utility model provides a buggy preparation safety alarm system in advance, includes by milling machine (5), powder pipe (6) that connect gradually and deposit the buggy preparation system that whitewashed clearance system constitutes, deposit whitewashed clearance system tail end and milling machine (5) air door and be connected its characterized in that: a flame-retardant protection tube (1) is connected between the feed inlet of the pulverizer (5) and the tail end of the powder tube (6) to form a gas protection system, and flame-retardant protection gas is filled into the flame-retardant protection tube (1) to the gas protection system or the pulverized coal preparation system to respectively carry out flame-retardant protection on the two systems;
the gas flow sensor (2) and the gas pressure sensor (3) which are used for monitoring the flow of protective gas, the gas filling time and the gas pressure in the two systems respectively are installed in the flame-retardant protection tube (1), the output ends of the gas flow sensor (2) and the gas pressure sensor (3) are connected with the pre-alarm system, the pre-alarm system calculates the powder storage amount and detects whether the air door is sealed or not according to the sectional area, the gas flow, the gas filling time and the gas pressure of the flame-retardant protection tube (1), and the pre-alarm system gives an alarm according to the detection data.
2. The pulverized coal preparation safety pre-alarm system according to claim 1, characterized in that: flame retardant protection pipe (1) feed inlet department connects inlet pipe (4), set up solenoid valve (15) No. one on inlet pipe (4), entry linkage desicator (13) of inlet pipe (4), desicator (13) entry connection material machine (14).
3. The pulverized coal preparation safety pre-alarm system according to claim 2, characterized in that: the flame-retardant protection tube (1) is connected with a gas tank (18) through a pipeline and an inflator pump (17), flame-retardant protective gas is carried in the gas tank (18), and the gas is carbon dioxide gas or inert gas.
4. The pulverized coal preparation safety pre-alarm system according to claim 3, characterized in that: deposit whitewashed clearance system and include dust collector (7), tuber pipe (8), air heater (20), dust collector (7) are connected with powder pipe (6), the position that powder pipe (6) are connected with dust collector (7) sets up No. two solenoid valve (16), dust collector (7) and milling machine (5) air door are connected in tuber pipe (8), air heater (20) are connected through hot-blast solenoid valve (19) to tuber pipe (8) one end, the one end that tuber pipe (8) and the air door of milling machine (5) are connected is provided with cold wind solenoid valve (21).
5. The pulverized coal preparation safety pre-alarm system according to claim 4, characterized in that: the pre-alarm system comprises a central processing unit (10), a primary alarm device (11) and a secondary alarm device (12), wherein the central processing unit (10) receives air pressure, nitrogen charging flow rate and nitrogen charging time information in a coal powder preparation system detected by a gas flow sensor (2) and a gas pressure sensor (3), the amount of stored powder in the pulverizer (5) and the sealing degree of an air door are judged according to the information and the sectional area of the flame-retardant protection tube (1), and the primary alarm device (11)/the secondary alarm device (12) is controlled to alarm when the amount of stored powder reaches a set threshold value and the air door is not sealed.
6. The pulverized coal preparation safety pre-alarm system according to claim 5, characterized in that: the primary alarm device (11) and the secondary alarm device (12) adopt different alarms or send different alarm signals to a supervisor terminal (22).
7. The method for performing safety pre-alarming by the coal powder preparation safety pre-alarming system according to any one of claim 6, is characterized by comprising the following steps:
before the coal powder preparation system is put into use, closing a first electromagnetic valve (15), a second electromagnetic valve (16) and a cold air electromagnetic valve (21), starting an inflator pump (17) to fill protective gas into the flame-retardant protective tube (1), the pulverizer (5) and the powder tube (6) to form a gas protection system, detecting the pressure, the nitrogen filling flow rate and the nitrogen filling time in the pulverizer (5) and the powder tube (6) by using a gas flow sensor (2) and a gas pressure sensor (3), and calculating the original volume in the gas protection system according to the sectional area of the flame-retardant protective tube (1);
after the pulverized coal preparation system is put into use and before the pulverizer (5) stops running, closing the first electromagnetic valve (15), opening the cold air electromagnetic valve (21) and the exhaust fan (9), blowing the gas filtered and exhausted by the dust collector (7) into the pulverizer (5) to blow up the stored powder in the pulverizer (5) and the powder pipe (6), and cleaning and outputting the cleaned stored powder to the dust collector (7);
step three, after the powder storage is cleaned for a period of time, repeating the step one, calculating to obtain the volume in the used gas protection system, wherein the difference between the volume and the original volume calculated in the step one is the powder storage volume, judging whether the air door is sealed according to a pressure change value, and controlling a primary alarm device (11) to alarm when the powder storage amount reaches a set threshold value and the air door is not sealed;
and step four, when the alarm is still given out after the air door is checked to be sealed, and the powder storage amount still reaches the set threshold value after the step two is repeated, the secondary alarm device (12) is controlled to give an alarm for manual maintenance.
8. The safety pre-alarming method of the coal powder preparation safety pre-alarming system according to claim 7, characterized in that: and step three and step four, during the alarming period, the conveying of the protective gas is not stopped, after the alarming, the second electromagnetic valve (16) and the cold air electromagnetic valve (21) are controlled to be opened, the exhaust fan (9) is started to carry out the work of powder storage and cleaning again, the protective gas is filled into the whole coal powder preparation system to carry out flame-retardant and explosion-proof protection, after the alarming is stopped, the flour mill (5) is stopped, and the protective gas is filled into the whole coal powder preparation system until the flour mill (5) is started again and is finished.
9. The safety pre-alarming method of the coal powder preparation safety pre-alarming system according to claim 7, characterized in that: in the first step and the second step, the volume change in the whole coal powder preparation system is detected after the inflator pump (17) is started by only closing the first electromagnetic valve (15), so that the powder storage amount in the whole coal powder preparation system is detected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110490112.XA CN113477385B (en) | 2021-05-06 | 2021-05-06 | Safety pre-alarm system for coal powder preparation |
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| CN202110490112.XA CN113477385B (en) | 2021-05-06 | 2021-05-06 | Safety pre-alarm system for coal powder preparation |
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| CN113477385A true CN113477385A (en) | 2021-10-08 |
| CN113477385B CN113477385B (en) | 2022-06-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN113477385B (en) | 2022-06-03 |
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