CN106743048B - Device and method for facilitating water absorption and heat storage guiding discharge in coal pile - Google Patents
Device and method for facilitating water absorption and heat storage guiding discharge in coal pile Download PDFInfo
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- CN106743048B CN106743048B CN201611235382.1A CN201611235382A CN106743048B CN 106743048 B CN106743048 B CN 106743048B CN 201611235382 A CN201611235382 A CN 201611235382A CN 106743048 B CN106743048 B CN 106743048B
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Abstract
The invention discloses a device and a method for facilitating water absorption and heat storage guiding discharge in a coal pile, and the device comprises a metal curved body (1), a metal cylinder (2) and an auxiliary gas guide pipe (3), wherein the metal cylinder (2) is a cylinder with two open ends, an isolation net (4) is arranged at an upper port of the metal cylinder (2), the metal curved body (1) is arranged in the metal cylinder (2), a filling cavity is arranged in the metal curved body (1), a reticular isolation hood (6) is arranged at a lower port of the metal curved body (1), the auxiliary gas guide pipe (3) is arranged in the metal cylinder (2), and part of a pipe body of the auxiliary gas guide pipe (3) extends into the metal curved body (1) through a through hole at the upper end of the metal curved body (1). The water is not required to be in direct contact with the coal body, so that the phenomenon that the water accelerates the coal pile to generate an exothermic reaction at the initial stage of spontaneous combustion of the coal is avoided; meanwhile, the directional heat conduction can be carried out by utilizing the phase change heat absorption of water, so that the temperature in the coal pile is reduced, and the spontaneous combustion of the coal pile is prevented.
Description
Technical Field
The invention relates to a device and a method for preventing spontaneous combustion of a coal pile, in particular to a device and a method for facilitating water absorption and heat storage guiding discharge in the coal pile.
Background
The mined coal has serious spontaneous combustion problems in the transportation and storage processes, and the spontaneous combustion of the coal is caused by the fact that the internal temperature of a coal pile is increased and cannot be distributed due to the fact that the internal temperature of the coal pile is increased and the oxygen is oxidized after the coal pile is stacked, and finally the internal temperature of the coal reaches the ignition point to generate the spontaneous combustion condition of the coal pile. Once coal spontaneous combustion occurs, on the one hand, the coal reserves and the heat value are lost; on the other hand, the smoke generated by spontaneous combustion produces great harm to the health and environment of people. Many solutions have been proposed based on this, such as flooding, grouting or foaming after coal ignition, but these methods cannot be suppressed in the initial stages of coal spontaneous combustion and cause a loss of part of the coal and the calorific value of the coal after remediation. Dehumidification at the initial stage of coal spontaneous combustion delays the spontaneous combustion process of coal, particularly the existence of water, and has many controversies on prevention and control of coal spontaneous combustion, on one hand, the water can generate exothermic reaction with the coal at the initial stage, so that the initial oxidation reaction and heat accumulation of a coal pile are accelerated; on the other hand, in the prevention and control of coal spontaneous combustion, whether water injection, grouting or foam fire extinguishing, the isolation effect of water on oxygen and the phase change heat dissipation principle are utilized. How to utilize the principle to prevent spontaneous combustion without accelerating the initial oxidation reaction and heat accumulation of the coal pile is a problem to be solved urgently in the industry.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the device and the method which are beneficial to water absorption and heat storage guiding discharge in the coal pile, so that the water is not required to be directly contacted with the coal body, and the phenomenon that the water accelerates the coal pile to generate heat release reaction at the initial stage of spontaneous combustion of the coal is avoided; meanwhile, the directional heat conduction can be carried out by utilizing the phase change heat absorption of water, so that the temperature in the coal pile is reduced, and the spontaneous combustion of the coal pile is prevented.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a device that helps moisture absorption and heat accumulation direction to discharge in coal pile, includes metal maze body, metal cylinder and supplementary air duct, the metal cylinder is both ends open-ended barrel, and the last port of metal cylinder is equipped with the separation net, the metal maze body sets up in the metal cylinder, is equipped with in the metal maze and fills the chamber, and the lower port of the metal maze body is equipped with netted cage, supplementary air duct setting is in the metal cylinder, and the partial body of supplementary air duct stretches into in the metal maze body through metal maze body upper end through-hole.
Furthermore, sliding grooves are arranged on the outer surface of the metal curved-diameter body and the inner surface of the metal cylinder body, so that the metal curved-diameter body slides relative to the metal cylinder body; a limit clamp is arranged on the sliding groove close to the lower port of the metal cylinder.
Further, the reticular isolation hood is semi-spherical.
Furthermore, a plurality of vent holes are arranged on the auxiliary gas-guide tube which extends into the metal labyrinth.
Furthermore, a one-way air partition plate is arranged in the auxiliary air duct.
Further, the outside of the reticular isolation cover is provided with a perforated protective cover, and the perforated protective cover is connected with the metal curved body through threads.
Furthermore, the metal curved body and the metal column body are both made of aluminum alloy.
Further, the metal curved body is connected with the reticular isolation cover through threads.
A method for facilitating water absorption and heat storage guiding discharge in a coal pile comprises the following specific steps:
A. filling hydrophilic materials into a filling cavity in the metal labyrinth and a space formed between the metal labyrinth and the metal column respectively, and injecting water into the filling cavity in the metal labyrinth and the space formed between the metal labyrinth and the metal column respectively;
B. after the completion, the metal labyrinth body is extended into the coal pile, and one end of the metal column body is positioned outside the coal pile;
C. after the temperature in the coal pile rises due to oxidation reaction, according to the law of thermodynamics, the temperature in the coal pile can be transferred to the hydrophilic material which absorbs water in the filling cavity through the metal cylinder, the metal labyrinth and air, the hydrophilic material changes the liquid into gas through water to absorb heat through phase change, so that the internal air pressure of the metal labyrinth is higher than the external air pressure, then the high-temperature water vapor is discharged through the auxiliary air duct, and the rest part of the high-temperature water vapor is diffused to the upper end of the metal labyrinth and transfers heat;
D. the hydrophilic material which is arranged in a space formed between the metal curved-diameter body and the metal column body and absorbs water rises when the temperature of the upper end of the metal curved-diameter body rises, the hydrophilic material changes from liquid into gas through water to absorb heat through phase change, and high-temperature water vapor is discharged through the separation net; finally, the internal temperature of the coal pile is reduced, and the spontaneous combustion of the coal pile is prevented.
Preferably, the hydrophilic material is prepared by compounding an active mineral drying agent, a montmorillonite drying agent and a polyacrylic acid series super absorbent resin according to the proportion of 6:3: 1.
Compared with the prior art, the invention adopts a mode of combining the metal curved body, the metal column body and the hydrophilic material, does not need direct contact of water and the coal body and can dehumidify the interior of the coal pile to reduce the humidity of the coal pile, thereby avoiding the water from accelerating the exothermic reaction of the coal pile at the initial stage of spontaneous combustion of the coal, absorbing the moisture on the surface of the coal body, and controlling the generating condition of the exothermic reaction of the coal body to delay the induction period of the autothermal reaction; in addition, the temperature generated by the oxidation reaction in the coal pile can be directionally transferred out through the phase change heat absorption effect of the water body twice, so that the internal temperature of the coal pile is reduced, and the spontaneous combustion of the coal pile is prevented.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the metal curved body and the auxiliary airway tube of the present invention;
FIG. 3 is a schematic structural view of a metal column according to the present invention;
FIG. 4 is a graph showing the water absorption effect of sepiolite, polyacrylic acid-based super absorbent resin, active mineral desiccant and montmorillonite desiccant used alone according to the present invention;
FIG. 5 is a diagram showing the water absorption effect of three different composite hydrophilic materials according to the present invention.
In the figure: 1. the device comprises a metal curved-diameter body, 2 metal cylinders, 3 auxiliary gas guide pipes, 4 isolating nets, 5 limiting clamps, 6 netted isolating covers, 7 sliding chutes, 8 unidirectional wind isolation plates, 9 perforated protecting covers.
Detailed Description
The present invention will be further explained below.
As shown in the figure, the gas-liquid separation device comprises a metal curved body 1, a metal cylinder 2 and an auxiliary gas guide pipe 3, wherein the metal cylinder 2 is a cylinder body with two open ends, an isolation net 4 is arranged at an upper port of the metal cylinder 2, the metal curved body 1 is arranged in the metal cylinder 2, a filling cavity is arranged in the metal curved body 1, a net-shaped isolation cover 6 is arranged at a lower port of the metal curved body 1, the auxiliary gas guide pipe 3 is arranged in the metal cylinder 2, and part of a pipe body of the auxiliary gas guide pipe 3 extends into the metal curved body 1 through a through hole at the upper end of the metal curved body 1.
Furthermore, a sliding groove 7 is arranged on the outer surface of the metal curved body 1 and the inner surface of the metal cylinder 2, so that the metal curved body 1 slides relative to the metal cylinder 2; a limit card 5 is arranged on the sliding chute 7 close to the lower port of the metal cylinder 2. By adopting the structure, the whole length of the device can be adjusted, and the device can conveniently extend into coal piles at different depths.
Further, the mesh cage 6 is semi-spherical. By adopting the shape, the contact area between the hydrophilic material in the metal curved body 1 and the air in the coal pile can be increased, and the heat conduction is better.
Furthermore, a plurality of vent holes are arranged on the part of the auxiliary gas-guide tube 3 extending into the metal curved body 1. The adoption sets up a plurality of air vents can make the vapor in the metal labyrinth 1 discharge through supplementary air duct 3, improves heat-conducting efficiency.
Furthermore, a one-way air baffle 8 is arranged in the auxiliary air duct 3. The structure can prevent air outside the coal pile from reversely entering through the auxiliary air duct 3 to further cause the oxidation reaction with the interior of the coal pile; meanwhile, the discharge of water vapor in the metal labyrinth 1 is not influenced.
Further, the outer part of the reticular isolation cover 6 is provided with an opening protective cover 9, and the opening protective cover 9 is connected with the metal curved body 1 through threads. The perforated protective cover 9 is additionally arranged, so that the mesh-shaped isolation cover 6 can be prevented from being damaged due to collision or extrusion.
Further, the metal curved body 1 and the metal column body 2 are both made of aluminum alloy. The aluminum alloy can reduce the overall weight of the device, and is convenient to carry and use.
Further, the metal curved body 1 is connected with the reticular isolation cover 6 through threads. The metal curved body 1 and the reticular isolation cover 6 are convenient to disassemble and install when hydrophilic materials are put into the metal curved body by adopting threaded connection.
A method for facilitating water absorption and heat storage guiding discharge in a coal pile comprises the following specific steps:
A. filling hydrophilic materials into a filling cavity in the metal curved body 1 and a space formed between the metal curved body 1 and the metal column body 2 respectively, and injecting water into the filling cavity in the metal curved body 1 and the space formed between the metal curved body 1 and the metal column body 2 respectively;
B. after the coal pile is finished, the metal curved body 1 extends into the coal pile, and one end of the metal column body 2 is positioned outside the coal pile; the device can be pre-embedded or drilled on the coal pile to extend into the coal pile;
C. after the temperature in the coal pile rises due to oxidation reaction, according to the law of thermodynamics, the temperature in the coal pile can be transferred to the hydrophilic material which absorbs water in the filling cavity through the metal cylinder 2, the metal curved body 1 and air, the hydrophilic material changes from liquid to gas through water to absorb heat through phase change, so that the internal air pressure of the metal curved body 1 is higher than the external air pressure, then the high-temperature water vapor part is discharged through the auxiliary air duct 3, and the rest part is diffused to the upper end of the metal curved body 1 and transfers heat;
D. the hydrophilic material which is arranged in a space formed between the metal curved body 1 and the metal column body 2 and absorbs water rises when the temperature of the upper end of the metal curved body 1 rises, the hydrophilic material changes from liquid to gas through water to absorb heat through phase change, and high-temperature water vapor is discharged through the separation net 4; finally, the internal temperature of the coal pile is reduced, and the spontaneous combustion of the coal pile is prevented.
The hydrophilic material can adopt known hydrophilic materials, including fiber desiccant, molecular sieve desiccant, clay desiccant, mineral desiccant, silica gel desiccant and super absorbent resin, such as sepiolite, polyacrylic acid series super absorbent resin, active mineral desiccant and montmorillonite desiccant, or a combination of more than one of the four hydrophilic materials, according to the independent dehumidification condition of the four different hydrophilic materials, the invention preferably adopts active mineral desiccant, montmorillonite desiccant and polyacrylic acid series super absorbent resin, and the mixture is compounded according to the proportion of 6:3: 1. Compared with the existing known hydrophilic materials or compound materials, the proportion can achieve higher dehumidification efficiency and more water absorption capacity under the condition of the same mass, and not only can dehumidify the interior of a coal pile to reduce the humidity of the coal pile, but also is convenient for sufficient moisture to evaporate and transfer heat during subsequent use.
The experiment proves that 1: drying and weighing sepiolite, polyacrylic acid series super absorbent resin, active mineral desiccant and montmorillonite desiccant, putting the four dehumidifying materials with the same mass into an environment with the temperature of 25 ℃ and the humidity of 80%, and taking the dehumidifying materials every 72 hours to detect the humidity. As can be seen from fig. 4, the most drying property in the initial stage of the experiment is the active mineral drying agent and the super absorbent resin, which can rapidly and effectively reduce the humidity of the surrounding coal body. With the extension of the experimental time, the drying capacities of the sepiolite drying agent and the active mineral drying agent are stably improved, and the water absorption capacities of the montmorillonite and the super absorbent resin drying agent tend to be stable. The reason is that the saturated moisture absorption rate and the water retention of different drying materials are greatly different, and the super absorbent resin has high saturated moisture absorption rate and water retention, so that the super absorbent resin can rapidly reduce the ambient humidity in the initial stage of an experiment, but the subsequent dehumidification capacity is reduced due to the higher water retention; sepiolite and montmorillonite desiccant have lower saturated moisture absorption and water retention than the former, and therefore have slower dehumidification effect in the early stage. According to the spontaneous combustion mechanism of the moisture-containing coal body and the self-heating influence of the moisture of the coal body, the drying agent of the device not only needs extremely high saturated moisture absorption rate to reduce the moisture of the coal body in a short time, but also can stably play a role in dehumidification in the subsequent stage, and achieves the effect of repeated drying and dehumidification. On the basis, the humidity change of the coal in the coal pile can be regarded as a dehumidifying efficiency parameter of the drying agent, so that the four drying agents are compounded according to a certain proportion, and the compounded drying agent has higher drying efficiency and continuous drying capacity than a single water absorbing material.
The experiment proves that 2: selecting three complex hydrophilic materials, namely a complex 1, a complex 2 and a complex 3,
the compound 1 is prepared by compounding an active mineral drying agent, a montmorillonite drying agent and polyacrylic acid series super absorbent resin according to the proportion of 6:3: 1;
the compound 2 is prepared by compounding polyacrylic acid series super absorbent resin, montmorillonite desiccant and sepiolite according to the proportion of 2:2: 1;
the compound 3 is prepared by compounding sepiolite, an active mineral drying agent and a montmorillonite drying agent according to the proportion of 1:1: 1;
the three complex hydrophilic materials are put into a coal pile with the water content of 30% by adopting the same mass, the burial depth is 1m, the coal samples around the three complex hydrophilic materials are taken every 72 hours to detect the humidity, the test is carried out for a plurality of times of sampling, and the test result is shown in figure 5.
As can be seen from the figure, the drying agent of the compound 1 has the best dehumidification efficiency, can control the humidity of the coal body to be below 15 percent in a short time, and has good subsequent dehumidification capacity. The compound 2 has better water absorption effect, but the dehumidification effect is gradually reduced along with the time. The water absorption effect of the compound 3 is the most stable, but the time is long. By combining the data, the hydrophilic material has optimal water absorption and dehumidification effects when the compound 1 is adopted.
Claims (10)
1. The device is characterized by comprising a metal curved body (1), a metal cylinder (2) and an auxiliary air duct (3), wherein the metal cylinder (2) is a cylinder with two open ends, an isolation net (4) is arranged at the upper port of the metal cylinder (2), the metal curved body (1) is arranged in the metal cylinder (2), a filling cavity is arranged in the metal curved body (1), a reticular isolation hood (6) is arranged at the lower port of the metal curved body (1), the auxiliary air duct (3) is arranged in the metal cylinder (2), and part of a tube body of the auxiliary air duct (3) extends into the metal curved body (1) through a through hole at the upper end of the metal curved body (1); the metal labyrinth body (1) is used for filling a hydrophilic material.
2. The device for assisting the absorption of moisture and the guided emission of stored heat in a coal pile according to claim 1, wherein a sliding groove (7) is formed on the outer surface of the metal curved body (1) and the inner surface of the metal cylinder (2) so that the metal curved body (1) slides relative to the metal cylinder (2); a limit clamp (5) is arranged on the sliding groove (7) close to the lower port of the metal cylinder (2).
3. The device for aiding the absorption of moisture and the directed discharge of stored heat from a coal pile according to claim 1 or 2, characterized in that the reticular isolation hood (6) is semi-spherical.
4. The device for assisting in absorbing moisture and accumulating heat in the coal pile and guiding and discharging the moisture and the accumulated heat in the coal pile as claimed in claim 1 or 2, wherein a plurality of vent holes are formed on the part of the auxiliary gas guide pipe (3) extending into the metal curved body (1).
5. The device for assisting the absorption of moisture and the guided discharge of heat accumulated in the coal pile as claimed in claim 1 or 2, wherein a one-way air baffle (8) is arranged in the auxiliary air duct (3).
6. The device for assisting the absorption of moisture and the guided drainage of stored heat in a coal pile as claimed in claim 1 or 2, wherein the mesh-shaped isolation cover (6) is externally provided with an open hole protective cover (9), and the open hole protective cover (9) is in threaded connection with the metal curved body (1).
7. The device for assisting in absorbing moisture and accumulating heat and guiding emission in the coal pile according to claim 1 or 2, wherein the metal curved body (1) and the metal column body (2) are both made of aluminum alloy.
8. The device for assisting the absorption of moisture and the directed discharge of stored heat from a coal pile according to claim 1 or 2, characterized in that the metal labyrinth (1) is screwed to the mesh cage (6).
9. The use method of the device for assisting in absorbing moisture and storing heat in the coal pile and guiding the discharge of the moisture and the heat in the coal pile is characterized by comprising the following specific steps of:
A. filling hydrophilic materials into a filling cavity in the metal curved body (1) and a space formed between the metal curved body (1) and the metal column body (2), and respectively injecting water into the filling cavity in the metal curved body (1) and the space formed between the metal curved body (1) and the metal column body (2);
B. after the coal pile is finished, the metal curved body (1) extends into the coal pile, and one end of the metal column body (2) is positioned outside the coal pile;
C. after the temperature in the coal pile rises due to oxidation reaction, according to the law of thermodynamics, the temperature in the coal pile can be transferred to the hydrophilic material which absorbs water in the filling cavity through the metal cylinder (2), the metal curved body (1) and air, the hydrophilic material changes from liquid to gas through water to absorb heat through phase change, so that the internal air pressure of the metal curved body (1) is higher than the external air pressure, then the high-temperature water vapor is partially discharged through the auxiliary air duct (3), and the rest part of the high-temperature water vapor is diffused to the upper end of the metal curved body (1) and transfers heat;
D. the hydrophilic material which is arranged in a space formed between the metal curved body (1) and the metal column body (2) and absorbs water rises when the temperature of the upper end of the metal curved body (1) rises, the hydrophilic material changes from liquid into gas through water to absorb heat through phase change, and high-temperature water vapor is discharged through the separation net (4); finally, the internal temperature of the coal pile is reduced, and the spontaneous combustion of the coal pile is prevented.
10. The method for using the device for assisting in absorbing moisture and storing heat in the coal pile for guiding and discharging according to claim 9, wherein the hydrophilic material is prepared by compounding an active mineral drying agent, a montmorillonite drying agent and a polyacrylic acid super absorbent resin according to a ratio of 6:3: 1.
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| CN201611235382.1A CN106743048B (en) | 2016-12-28 | 2016-12-28 | Device and method for facilitating water absorption and heat storage guiding discharge in coal pile |
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| JP2006321646A (en) * | 2005-05-20 | 2006-11-30 | Kobelco Logistics Ltd | Method for preventing spontaneous ignition in coal storage silo |
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| CN103111030A (en) * | 2013-01-05 | 2013-05-22 | 神华集团有限责任公司 | System and method for preventing coal spontaneous combustion or extinguishing coal spontaneous combustion |
| CN104492004A (en) * | 2014-11-21 | 2015-04-08 | 中国矿业大学 | Method for preventing coal waste piles from spontaneous combustion |
| CN205460576U (en) * | 2016-01-08 | 2016-08-17 | 西安科技大学 | Coal pile spontaneous combustion preventing device |
| CN206327779U (en) * | 2016-12-28 | 2017-07-14 | 湖南科技大学 | Moisture absorption and accumulation of heat in dump is contributed to be oriented to the device discharged |
-
2016
- 2016-12-28 CN CN201611235382.1A patent/CN106743048B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006321646A (en) * | 2005-05-20 | 2006-11-30 | Kobelco Logistics Ltd | Method for preventing spontaneous ignition in coal storage silo |
| CN201580755U (en) * | 2009-08-19 | 2010-09-15 | 徐子珺 | Coal pile for actively preventing spontaneous combustion of coal without energy consumption |
| CN103111030A (en) * | 2013-01-05 | 2013-05-22 | 神华集团有限责任公司 | System and method for preventing coal spontaneous combustion or extinguishing coal spontaneous combustion |
| CN104492004A (en) * | 2014-11-21 | 2015-04-08 | 中国矿业大学 | Method for preventing coal waste piles from spontaneous combustion |
| CN205460576U (en) * | 2016-01-08 | 2016-08-17 | 西安科技大学 | Coal pile spontaneous combustion preventing device |
| CN206327779U (en) * | 2016-12-28 | 2017-07-14 | 湖南科技大学 | Moisture absorption and accumulation of heat in dump is contributed to be oriented to the device discharged |
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