CN113030176A - Heat pipe heat transfer parameter testing experimental device for preventing spontaneous combustion of coal bunker - Google Patents
Heat pipe heat transfer parameter testing experimental device for preventing spontaneous combustion of coal bunker Download PDFInfo
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- CN113030176A CN113030176A CN202110429335.5A CN202110429335A CN113030176A CN 113030176 A CN113030176 A CN 113030176A CN 202110429335 A CN202110429335 A CN 202110429335A CN 113030176 A CN113030176 A CN 113030176A
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Abstract
The invention belongs to the technical field of coal safety fire prevention and extinguishment, and discloses a heat pipe heat transfer parameter testing experimental device for preventing spontaneous combustion of a coal bunker, which comprises a coal charging box, a liquid absorption core hot rod, a temperature control system, a measuring point temperature acquisition device and a temperature analysis early warning system, wherein a coal sample is filled in the coal charging box, and the liquid absorption core hot rod is inserted into the coal sample; the liquid absorption core hot rod is a sealed metal pipe with a working medium inside, the liquid absorption core hot rod comprises an evaporation section, a condensation section and a heat insulation section, the heat insulation section is located between the evaporation section and the condensation section, heat dissipation fins are arranged on the outer wall of the condensation section, and a wire mesh structure is arranged in the evaporation section. The invention is suitable for radiating the interior of the coal sample of the coal charging box by using the liquid absorption core hot rods with different inclination angles so as to achieve the purpose of spontaneous combustion prevention, and has the advantages of convenience, simplicity, lower cost, good simulation effect and high economic feasibility.
Description
Technical Field
The invention belongs to the technical field of coal safety fire prevention and extinguishing, and particularly relates to a heat pipe heat transfer parameter testing experimental device for preventing spontaneous combustion of a coal bunker.
Background
Coal is easy to self-ignite due to self-oxidation and heat accumulation when being accumulated in a coal bunker for a long time. The traditional prevention and control methods comprise flame retardant spraying, coal pile compaction and the like, which are all based on the perspective of oxygen isolation, but complete isolation cannot be achieved, and the possibility of fire ignition still exists along with the time. The currently known experiments for researching the heat transfer performance of the heat rod are as follows: the test of the heat transfer and cooling performance of the self-combustion hot rod obtains the conclusion that the farther the self-combustion hot rod is away from the hot rod, the worse the cooling effect is; the research experiment of the key technology for preventing and extinguishing fire of the coal spontaneous combustion hot rod obtains the conclusion that the heat effect is different when the insertion inclination angle of the hot rod is changed. At present, the research experiment on the heat transfer parameter of the heat rod is common, but the control on other factors influencing the experimental result except for variables in the experiment development process cannot be unified, and an experimental device specially used for testing the heat transfer parameter of the heat rod is lacked.
Disclosure of Invention
The invention aims to provide an experimental device for testing heat transfer parameters of a coal bunker spontaneous combustion preventing heat pipe.
In order to achieve the purpose, the invention adopts the following technical scheme:
a heat pipe heat transfer parameter test experimental device for preventing spontaneous combustion of a coal bunker comprises a coal charging box, a liquid absorption core hot rod, a temperature control system, a measuring point temperature acquisition device and a temperature analysis early warning system, wherein a coal sample is filled in the coal charging box, and the liquid absorption core hot rod is inserted into the coal sample; the liquid absorption core hot rod is a sealed metal pipe with a working medium filled inside, the liquid absorption core hot rod comprises an evaporation section, a condensation section and a heat insulation section, the heat insulation section is positioned between the evaporation section and the condensation section, the outer wall of the condensation section is provided with radiating fins, and a wire mesh structure is arranged in the evaporation section;
the temperature analysis early warning system comprises a host, a semiconductor thermoelectric generation chip, a thermistor, a wireless transmitter and a temperature analyzer; the host and the semiconductor thermoelectric generation piece are respectively arranged on the outer side wall of the liquid absorption core hot rod, the hot end of the semiconductor thermoelectric generation piece is contacted with a coal sample, the wireless transmitter is arranged at the top of the host and is electrically connected with the host and is in wireless communication with the temperature analyzer, the thermistor is arranged on the outer side wall of the evaporation section of the liquid absorption core hot rod and is electrically connected with the host, and the power supply end of the host is connected with the semiconductor thermoelectric generation piece;
the temperature control system comprises a main controller, a heater, a transmitting circuit, a receiving circuit, an alarm device and a display device; the main controller is connected with the heater through the transmitting circuit, and the heater is connected with the display device; the alarm device is connected with a temperature analyzer of the temperature analysis early warning system through a receiving circuit;
the measuring point temperature acquisition device comprises a plurality of thermocouples and a temperature acquisition device, wherein the thermocouples are used for acquiring the temperature of coal samples at each position in the coal container; the thermocouple is connected with a temperature analyzer through a temperature acquisition device, and the temperature analyzer is connected with an alarm device through a receiving circuit;
the evaporation section and the thermocouple are both arranged in a coal sample in the coal charging box.
By way of limitation, in the wick hot rod, the length ratio of the evaporation section to the heat insulation section to the condensation section is 5: 6: 4, the ratio of the length of the liquid absorption core hot rod exposed outside the coal sample to the length of the liquid absorption core hot rod inserted into the coal sample is 2: 3.
as a second limitation, the working medium contained in the liquid absorption core hot rod is water containing 25% of buffering agent, and the internal pressure of the liquid absorption core hot rod is 6500-7000 pa.
And as a third limitation, the outer wall of the condensation section of the liquid absorption core hot rod is provided with a circular radiating fin, and the circular radiating fin and the condensation section are welded by using a high-frequency resistor.
As a fourth limitation, the wire mesh structure provided in the evaporation section is a honeycomb porous structure.
As a fifth limitation, the thermistors are positive temperature coefficient thermistors, and the number of the thermistors is two, and the two thermistors are arranged on two sides of the outer side wall of the evaporation section.
As a sixth limitation, the heater is disposed on an outside wall of the coal bin.
As a seventh limitation, the main controller adopts a circuit with an STC89C52RC chip as a core; the display device adopts an LCD1602 display screen; both the transmitting circuit and the receiving circuit adopt circuits with NRF24L01+ chips as cores.
As an eighth limitation, the coal charging box is characterized in that the coal charging box is formed by processing double-layer stainless steel plates, and high-temperature-resistant heat-preservation cotton is arranged between the stainless steel plates.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the technical progress that:
(1) the circular radiating fins are arranged on the outer side of the condensation section in the liquid absorption core hot rod, the evaporation section is internally provided with a honeycomb porous structure, the porous structure is favorable for forming nucleate boiling, the working efficiency of heat exchange of the liquid absorption core hot rod is improved by a mode of synchronously strengthening the evaporation section and the condensation section, and the heat dissipation in the coal sample of the coal charging box is more favorable;
(2) according to the invention, the semiconductor temperature difference power generation sheet is arranged on the surface of the liquid absorption core hot rod, heat energy is converted into electric energy by the semiconductor temperature difference power generation sheet through the temperature difference between the heat stored by coal and air, and the electric energy is supplied to a host and a wireless transmitter, so that the heat energy conversion efficiency is 34% higher than that of the traditional temperature difference power generation sheet;
(3) according to the invention, the measuring point temperature acquisition device is arranged, so that the temperature of coal samples in the coal container can be acquired and transmitted to the temperature analyzer for analysis, technicians can control the temperature condition of the coal pile in time, and when the temperature exceeds the specified safe temperature, the temperature analyzer can communicate with the alarm device through the receiving circuit to send out an alarm;
(4) according to the invention, through improving the structural arrangement of the liquid absorption core hot rod, the experimental device for testing the heat transfer parameters of the coal bunker spontaneous combustion preventing heat pipe is designed, so that the heat transfer and cooling effects of the liquid absorption core hot rod on the interior of coal at different inclination angles are effectively monitored and analyzed, and a certain theoretical guidance is provided for the coal pile hot rod fire prevention and extinguishing technology;
the invention belongs to the technical field of coal safety fire prevention and extinguishing, is used for radiating the inside of a coal sample of a coal charging box by utilizing a liquid absorption core hot rod so as to achieve the purpose of spontaneous combustion prevention, and has the advantages of convenience and simplicity in realization, lower cost, good simulation effect and high economic feasibility.
Drawings
FIG. 1 is a schematic structural diagram of a coal charging box, a liquid absorption core hot rod and a temperature analysis early warning system according to an embodiment of the invention;
fig. 2 is a schematic overall structure diagram of the embodiment of the present invention.
In the figure: 1. loading a coal box; 2. a wick hot bar; 3. an evaporation section; 4. a thermally insulating section; 5. a condensing section; 6. circular radiating fins; 7. a host; 8. a semiconductor thermoelectric power generation sheet; 9. a thermistor; 10. a wireless transmitter; 11. a temperature analyzer; 12. a main controller; 13. a heater; 14. a transmitting circuit; 15. a receiving circuit; 16. an alarm device; 17. a display device; 18. a thermocouple; 19. a temperature acquisition device.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Embodiment is used for preventing coal bunker spontaneous combustion heat pipe heat transfer parameter test experimental apparatus
As shown in fig. 1, the present embodiment includes a coal charging box 1, a liquid absorption core hot rod 2, a temperature control system, a measurement point temperature collecting device, and a temperature analysis early warning system, wherein a coal sample is loaded in the coal charging box 1, and the liquid absorption core hot rod is inserted into the coal sample. Wherein, dress coal bin 1 is formed by double-deck corrosion resistant plate processing, is equipped with high temperature resistant heat preservation cotton between the corrosion resistant plate, and dress coal bin 1 has following characteristics: a. the appearance and the surface are smooth, and no scratch, stain or damage exists; b. the coal can not deform after being charged; c. high temperature resistance; d. the heat preservation performance is good.
The liquid absorption core hot rod 2 is a sealed metal pipe with a working medium filled inside, the liquid absorption core hot rod 2 comprises an evaporation section 3, a condensation section 5 and a heat insulation section 4, the heat insulation section 4 is positioned between the evaporation section 3 and the condensation section 5, and the evaporation section 3 and the heat insulation section 4 are arranged in a coal sample in the coal charging box 1; the outer wall of the condensation section 5 is provided with a circular radiating fin 6, and the evaporation section 3 is internally provided with a wire mesh structure. Wherein, the length proportion of the evaporation section 3, the heat insulation section 4 and the condensation section 5 is 5: 6: 4, the ratio of the length of the liquid absorption core hot rod 2 exposed outside the coal sample to the length of the liquid absorption core hot rod inserted into the coal sample is 2: 3.
in the embodiment, the total length of the liquid absorption core hot rod 2 is 1.5m, the length of the evaporation section 3 is 0.5m, the length of the heat insulation section 4 is 0.6m, the length of the condensation section 5 is 0.4m, the pipe diameter is 49mm, and the wall thickness is 3 mm; the liquid working medium in the liquid absorption core hot rod 2 is water containing 25% of buffering agent, the pressure in the liquid absorption core hot rod 2 is 7000pa, the boiling point of the water is 40 ℃, the outer wall of the condensation section 5 of the liquid absorption core hot rod 2 is provided with a circular radiating fin 6 which is welded with the condensation section 5 through a high-frequency resistor, the wire mesh structure in the evaporation section 3 is a honeycomb porous structure, and the porous structure is favorable for forming nucleate boiling.
The temperature analysis early warning system comprises a host 7, a semiconductor thermoelectric generation sheet 8, a thermistor 9, a wireless transmitter 10 and a temperature analyzer 11; host computer 7, semiconductor thermoelectric generation piece 8 sets up respectively on the lateral wall of imbibition hot-stick 2, semiconductor thermoelectric generation piece 8's hot junction and coal sample contact, wireless transmitter 10 sets up in host computer 7 top and with 7 electric connection of host computer, and with 11 wireless communication connection of temperature analyzer, thermistor 9 sets up on the lateral wall of imbibition hot-stick 2 evaporation zone 3 and with 7 electric connection of host computer, the power end and the semiconductor thermoelectric generation piece 8 of host computer 7 are connected. The main machine 7, the semiconductor thermoelectric generation piece 8 and the wireless transmitter 10 are positioned outside the coal charging box 1.
Wherein, the thermistor 9 is a positive temperature coefficient thermistor, and the number of the thermistors 9 is two, and the thermistors are arranged on two sides of the outer side wall of the evaporation section 3. 2 surfaces of imbibition core hot rod set up semiconductor thermoelectric generation piece 8, with the hot junction and the coal sample contact of semiconductor thermoelectric generation piece 8, through the difference in temperature of coal self heat accumulation and air, utilize semiconductor thermoelectric generation piece 8 to convert heat energy into electric energy, for host computer 7 and wireless transmitter 10 power supply, compare in traditional thermoelectric generation piece, heat energy conversion efficiency is high 34%.
The temperature control system comprises a main controller 12, a heater 13, a transmitting circuit 14, a receiving circuit 15, an alarm device 16 and a display device 17; the main controller 12 is connected with the heater 13 through the transmitting circuit 14, and the heater 13 is connected with the display device 17; the alarm device 16 is connected with the temperature analyzer 11 of the temperature analysis early warning system through the receiving circuit 15. The main controller 12 adopts a circuit with an STC89C52RC chip as a core; the display device 17 adopts an LCD1602 display screen; the transmission circuit 14 and the reception circuit 15 both use circuits with NRF24L01+ chips as cores. The heater 13 is provided on the outer side wall of the coal charging box 1.
The measuring point temperature acquisition device comprises a plurality of thermocouples 18 and a temperature acquisition device 19 which are used for acquiring the temperature of coal samples at each position in the coal container 1; the thermocouple 18 is connected with the temperature analyzer 11 through the temperature acquisition device 19, the temperature analyzer 11 is connected with the alarm device 16 through the receiving circuit 15, and the thermocouples 18 are all arranged in the coal sample in the coal charging box 1.
In this embodiment, the thermocouples 18 are provided with twenty-four, and are divided into three layers, namely a lower layer, a middle layer and an upper layer, wherein 8 thermocouples in each layer are buried in the coal sample, and the thermocouples 18 in the lower layer sequentially comprise a1, a2, A3, a4, a5, a6, a7 and A8 from left to right. The middle thermoelectricity is B1, B2, B3, B4, B5, B6, B7 and B8 from left to right, and the upper thermocouple 18 is C1, C2, C3, C4, C5, C6, C7 and C8 from left to right. The distance between the lower-layer thermocouple 18 and the bottom of the coal charging box 1 is 15cm, the distance between the upper-layer thermocouple 18 and the top of the coal charging box 1 is also 15cm, and the distance between the middle-layer thermocouple 18 and the upper-layer and lower-layer thermocouples 18 is 10 cm.
As shown in fig. 2, the working principle of this embodiment is as follows: firstly, a coal sample is loaded into a coal charging box 1, and then twenty-four thermocouples 18 are buried in the coal charging box 1; the heater 13 is then controlled by the main controller 12 using the transmitting circuit 14 to heat the coal sample, and the heating temperature is displayed on the display device 17.
The liquid absorption core hot rod 2 is enabled to be away from the heater 13 for a certain distance, the liquid absorption core hot rod 2 is embedded into a coal sample at different inclination angles, the heat insulation section 4 and the evaporation section 3 are embedded into the coal sample, the condensation section 5 is located outside the coal charging box 1, because a liquid working medium arranged in the liquid absorption core hot rod 2 is water containing 25% of a buffering agent, the internal pressure of the liquid absorption core hot rod 2 is 7000pa, the boiling point of the water is 40 ℃, the temperature of the coal sample in the coal charging box 1 gradually rises to reach the boiling point of the water to enable the coal sample to boil, a large amount of heat is emitted by boiling and rises to the condensation section 5, the outer wall of the condensation section 5 is provided with a circular heat dissipation fin 6, the heat is dissipated through the circular heat dissipation fin 6, and after the working medium is condensed and cooled, the working medium flows back to the evaporation section 3 of the liquid absorption core.
Simultaneously, after the thermistor 9 of 2 evaporation zone 3 both sides of imbibition core induced the temperature rise, the resistance also can rise, thermistor 9 sends resistance signal for 7 backs of host computer, host computer 7 converts resistance signal into temperature signal and sends for wireless transmitter 10 backs, wireless transmitter 10 sends temperature signal for temperature analyzer 11 and carries out the analysis, temperature analyzer 11 handles the temperature signal of feedback, analysis imbibition core hot stick 2 is to the influence of the distribution of the incasement portion temperature field of coal charge under different inclinations.
After twenty-four thermocouples 18 are buried in the coal charging box 1 to measure the temperature of each part of the coal sample, measured temperature signals are transmitted to the temperature acquisition device 19, when the temperature acquisition device 19 transmits the temperature signals to the temperature analyzer 11, the temperature change conditions of the twenty-four thermocouples are analyzed, such as the maximum temperature difference, the maximum temperature reduction rate, the accumulated temperature reduction and the average temperature reduction rate, and meanwhile when the temperature analyzer 11 detects that the signal temperature exceeds the coal self-heating critical temperature, critical electrical signals are transmitted to the alarm device 16 through the receiving circuit 15 of the temperature system to give an alarm.
In this embodiment, the working medium provided in the wick hot rod 2 is water containing 25% of a buffer, and the internal pressure of the wick hot rod 2 is 7000 pa. In practical application, the working medium can also be nitrogen, Freon or propane, and the internal pressure of the liquid absorption core hot rod 2 can be 6500-7000 pa.
In this embodiment, the wick hot rod 2 may be inserted vertically into the coal charging box 1, or may be inserted obliquely at a certain angle.
Claims (9)
1. A heat pipe heat transfer parameter test experimental device for preventing spontaneous combustion of a coal bunker is characterized by comprising a coal charging box, a liquid absorption core hot rod, a temperature control system, a measuring point temperature acquisition device and a temperature analysis early warning system, wherein a coal sample is filled in the coal charging box, and the liquid absorption core hot rod is inserted into the coal sample; the liquid absorption core hot rod is a sealed metal pipe with a working medium filled inside, the liquid absorption core hot rod comprises an evaporation section, a condensation section and a heat insulation section, the heat insulation section is positioned between the evaporation section and the condensation section, the outer wall of the condensation section is provided with radiating fins, and a wire mesh structure is arranged in the evaporation section;
the temperature analysis early warning system comprises a host, a semiconductor thermoelectric generation chip, a thermistor, a wireless transmitter and a temperature analyzer; the host and the semiconductor thermoelectric generation piece are respectively arranged on the outer side wall of the liquid absorption core hot rod, the hot end of the semiconductor thermoelectric generation piece is contacted with a coal sample, the wireless transmitter is arranged at the top of the host and is electrically connected with the host and is in wireless communication with the temperature analyzer, the thermistor is arranged on the outer side wall of the evaporation section of the liquid absorption core hot rod and is electrically connected with the host, and the power supply end of the host is connected with the semiconductor thermoelectric generation piece;
the temperature control system comprises a main controller, a heater, a transmitting circuit, a receiving circuit, an alarm device and a display device; the main controller is connected with the heater through the transmitting circuit, and the heater is connected with the display device; the alarm device is connected with a temperature analyzer of the temperature analysis early warning system through a receiving circuit;
the measuring point temperature acquisition device comprises a plurality of thermocouples and a temperature acquisition device, wherein the thermocouples are used for acquiring the temperature of coal samples at each position in the coal container; the thermocouple is connected with a temperature analyzer through a temperature acquisition device, and the temperature analyzer is connected with an alarm device through a receiving circuit;
the evaporation section and the thermocouple are both arranged in a coal sample in the coal charging box.
2. The experimental device for testing the heat transfer parameters of the heat pipe for preventing the spontaneous combustion of the coal bunker according to claim 1, wherein in the liquid absorption core hot rod, the length ratio of the evaporation section to the heat insulation section to the condensation section is 5: 6: 4, the ratio of the length of the liquid absorption core hot rod exposed outside the coal sample to the length of the liquid absorption core hot rod inserted into the coal sample is 2: 3.
3. the experimental device for testing the heat transfer parameters of the coal bunker spontaneous combustion preventing heat pipe according to claim 2, wherein the working medium filled in the liquid absorption core hot rod is water containing 25% of a buffering agent, and the internal pressure of the liquid absorption core hot rod is 6500-7000 pa.
4. The experimental device for testing the heat transfer parameters of the heat pipe for preventing the spontaneous combustion of the coal bunker as claimed in claim 3, wherein a circular radiating fin is arranged on the outer wall of the condensation section of the liquid absorption core heat rod, and the circular radiating fin and the condensation section are welded by a high-frequency resistor.
5. The experimental device for testing the heat transfer parameters of the heat pipe for preventing the spontaneous combustion of the coal bunker as claimed in claim 4, wherein the wire mesh structure arranged in the evaporation section is a honeycomb porous structure.
6. The experimental device for testing the heat transfer parameters of the coal bunker spontaneous combustion preventing heat pipe as claimed in claim 1, wherein the thermistors are positive temperature coefficient thermistors, and the number of the thermistors is two, and the two thermistors are arranged on two sides of the outer side wall of the evaporation section.
7. The experimental device for testing the heat transfer parameters of the coal bunker spontaneous combustion preventing heat pipe as claimed in claim 1, wherein the heater is arranged on the outer side wall of the coal bunker.
8. The experimental device for testing the heat transfer parameters of the heat pipe for preventing the spontaneous combustion of the coal bunker as claimed in claim 1, wherein the main controller adopts a circuit with an STC89C52RC chip as a core; the display device adopts an LCD1602 display screen; both the transmitting circuit and the receiving circuit adopt circuits with NRF24L01+ chips as cores.
9. The experimental device for testing the heat transfer parameters of the heat pipe for preventing the spontaneous combustion of the coal bunker as claimed in any one of claims 1 to 8, wherein the coal charging box is formed by processing double layers of stainless steel plates, and high-temperature-resistant heat-insulating cotton is arranged between the stainless steel plates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110429335.5A CN113030176A (en) | 2021-04-21 | 2021-04-21 | Heat pipe heat transfer parameter testing experimental device for preventing spontaneous combustion of coal bunker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110429335.5A CN113030176A (en) | 2021-04-21 | 2021-04-21 | Heat pipe heat transfer parameter testing experimental device for preventing spontaneous combustion of coal bunker |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116541983A (en) * | 2023-04-28 | 2023-08-04 | 山东亚特尔集团股份有限公司 | Coal pile heat dissipation flame retardant design method |
| CN116561917A (en) * | 2023-04-28 | 2023-08-08 | 山东亚特尔集团股份有限公司 | Coal pile heat dissipation flame retardant and selection design method and layout method thereof |
-
2021
- 2021-04-21 CN CN202110429335.5A patent/CN113030176A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116541983A (en) * | 2023-04-28 | 2023-08-04 | 山东亚特尔集团股份有限公司 | Coal pile heat dissipation flame retardant design method |
| CN116561917A (en) * | 2023-04-28 | 2023-08-08 | 山东亚特尔集团股份有限公司 | Coal pile heat dissipation flame retardant and selection design method and layout method thereof |
| CN116561917B (en) * | 2023-04-28 | 2024-04-05 | 山东亚特尔集团股份有限公司 | Coal pile heat dissipation flame retardant and selection design method and layout method thereof |
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