CN103306706A - Device and process for preparing aerosol for preventing coal from spontaneous combustion - Google Patents
Device and process for preparing aerosol for preventing coal from spontaneous combustion Download PDFInfo
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- CN103306706A CN103306706A CN2013102340944A CN201310234094A CN103306706A CN 103306706 A CN103306706 A CN 103306706A CN 2013102340944 A CN2013102340944 A CN 2013102340944A CN 201310234094 A CN201310234094 A CN 201310234094A CN 103306706 A CN103306706 A CN 103306706A
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Abstract
The invention relates to a device and a process for preparing aerosol for preventing coal from spontaneous combustion, and solves the problem of spontaneous combustion of coal in a coal mine goaf, in particular to residual coal in a high space. The device comprises a jet current proportion device, an aerosol atomization device and a pneumatic conveying device, wherein the jet current proportion device comprises a jet current proportioner, a pressure water inlet connected with a spray nozzle of the jet current proportioner, as well as an inhibitor inlet connected with a liquid absorption chamber of the jet current proportioner, and a delivery outlet of the jet current proportioner is connected with a liquid inlet of the aerosol atomization device; the aerosol atomization device comprises an atomization chamber, and an aerosol delivery outlet of the atomization chamber is connected with a suction inlet of the pneumatic conveying device; and the pneumatic conveying device comprises a pneumatic conveyor, a pneumatic conveying device suction inlet communicated with the pneumatic conveyor as well as a pressure gas inlet and a pneumatic conveying device delivery outlet which are communicated with the pneumatic conveyor. According to the device and the process, an inhibitor is diluted by water and then atomized, and finally, atomized inhibiting aerosol is conveyed to the goaf with pressure gas.
Description
Technical field
The present invention relates to coal spontaneous combustion fireproofing technique field, goaf.
Background technology
The whole nation has in the colliery 56% mine to have the danger of spontaneous fire, cause every year directly and nearly 10,000,000,000 yuan of indirect economic loss.Existing preventing and extinguishing fire technology all is to realize anti-fire extinguishing by reducing or reduce mixture of coal with oxygen, and is larger for the resistance inerting difficulty in the comparatively unobstructed goaf of leaking out.Especially combining the employing pit mining intensity of adopting with Longwall top coal caving technology strengthens, the ventilation system relative complex, the goaf scope constantly enlarges, and the goaf be the easiest also be the zone that freely burning fire the most often occurs, increased greatly the frequency of mine coal spontaneous combustion and the difficulty of control.The goaf drop has a large amount of float coal; There is the oxygen supply of continuously leaking out; Possess good something lost coal accumulation of heat environment, and the goaf area is large, spontaneous combustion " three bands " is dynamic mobile, loses that the coal high temperature range is large, high temperature dot is hidden with the propelling of work plane, in case it is large-area often that spontaneous combustion occurs, the fire extinguishing difficulty is very large.
The Main Means of at present control coal spontaneous combustion is cooling (such as water filling, slip casting, glue injection body, notes three-phase froth etc.) and goaf inerting (as annotating nitrogen, carbon dioxide injection etc.), although positive role has been brought into play in the anti-fire extinguishing of these means in the low bit space of colliery Close Quarters Goaf, catch fire and to prove effective fully for the high bit space in remote goaf.Because coal spontaneous combustion mostly occurs in the goaf, the area in goaf is larger, burning things which may cause a fire disaster point is more hidden and be difficult to determine its particular location, conventional fireproofing extinguishing materials is difficult to carry out the large tracts of land filling, and do not possess good accumulation, undesirable to regional coal spontaneous combustion fire effects such as preventing and controlling face goafs.So can make the goaf fall oxygen, inerting in the urgent need to research, the resistance formed material is taken to remote hidden zone resistanceization spontaneous combustion of remaining coal, and arrive fire proofing material, equipment and the technique for applying of the high bit space in goaf.
Summary of the invention
The invention provides a kind of aerosol preparation facilities and technique of preventing and treating coal spontaneous combustion, it can prevent and treat the spontaneous combustion of the zone something lost coals such as coal mine gob, and the resistance formed material is taken to remote hidden zone, particularly takes goaf high bit space resistanceization spontaneous combustion of remaining coal to.
The thinking that the present invention addresses the above problem is: with retardant dilution, and be atomized into aerosol and send into coal spontaneous combustion deathtrap, goaf.
For solving above technical problem, the present invention provides following technical scheme:
The aerosol preparation facilities of control coal spontaneous combustion provided by the present invention, its special character is: comprise the jet-flow proportioning device, aerosol atomization plant and the pneumatic conveyor that link to each other successively,
Wherein, the jet-flow proportioning device comprise jet-flow proportioning device, the press water import that is connected with jet-flow proportioning device nozzle, with the retardant import that jet-flow proportioning device imbibition chamber is connected, jet-flow proportioning device delivery outlet is connected with the aerosol atomization plant inlet;
Aerosol atomization plant comprises spray chamber and the supply terminals that places in the explosion-resistant enclosure, is provided with pulverizer plate in the spray chamber, and the vaporific aerosol delivery outlet of spray chamber is connected with the pneumatic conveyor intake;
Pneumatic conveyor comprises pneumatic conveyer, the pneumatic conveyor intake that is communicated with pneumatic conveyer, the pressed gas import that is communicated with pneumatic conveyer and pneumatic conveyor delivery outlet, described pressed gas is nitrogen or carbon dioxide, consider the safety to the staff, preferred nitrogen.
Preferred version of the present invention is that above-mentioned jet-flow proportioning device comprises nozzle, is positioned at imbibition chamber, the trunnion that is connected with the imbibition chamber and the anemostat that is connected with trunnion of nozzle periphery, when the pressure of press water was 1～2Mpa, the volume flow ratio of retardant and press water was 1: 3～1: 4.
Above-mentioned pulverizer plate preferably adopts integrated form ultrasonic atomization plate.
For real-time monitored jet-flow proportioning install pipes pressure and the flow of upper liquid, also in order to guarantee atomization quality, prevent that impurity from entering into aerosol atomization plant, be respectively equipped with pressure meter, flow meter and filter screen at press water inlet pipeline and the retardant inlet pipeline of jet-flow proportioning device.
The aerosol preparation technology of control coal spontaneous combustion provided by the invention, its special character is: may further comprise the steps:
1) preparation of retardant mixed liquor: use the jet-flow proportioning device, with the negative pressure of press water jet generation retardant is sucked, dilute mixing, obtain the retardant mixed liquor;
2) atomizing: with step 1) the retardant mixed liquor that obtains is transported to the aerosol atomization plant processing that atomizes by the jet-flow proportioning device, obtains vaporific resistance aerosol;
3) pneumatic output: use pneumatic conveyor, with pressure nitrogen gas or pressure carbon dioxide gas with step 2) the vaporific resistance aerosol that obtains sucks the pneumatic conveyer of pneumatic conveyor, vaporific resistance aerosol mixes with pressure nitrogen gas or pressure carbon dioxide gas, and by the power of pressure nitrogen gas or pressure carbon dioxide gas vaporific resistance aerosol is outputed to the goaf.
The preferred version of this method is: the pressure of press water is 1～2Mpa step 1), and the volume flow ratio of retardant and press water is 1: 3～1: 4; Step 2) the resistance aerosol particles diameter in after the atomizing is 1～10 μ m.
Above-mentioned steps 3) pressure of nitrogen or carbon dioxide gas is preferably in: 0.5～0.7MPa.
Retardant can be CaCl
2Solution, MgCl
2Solution, ZnCl
2Solution or Ca (OH)
2One or more mixing in the solution, these are several but be not limited in.
Compared with prior art, the present invention has the following advantages:
The present invention with press water and pressure nitrogen gas or pressure carbon dioxide as transmitting power, so safe and reliable.Because the resistance aerosol of preparation is vaporific, by the power of pressed gas can be rapidly to the something lost coal resistance of whole large tracts of land goaf and high bit space, prolong spontaneous combustion period, play the effect of parcel, resistanceization, inerting, effectively suppress and prevent the development of coal spontaneous combustion.
The present invention can utilize the down-hole nitrogen-filling system, by pneumatic conveyer the resistance aerosol delivery is arrived the hidden zone of goaf coal spontaneous combustion, the nitrogen that enters flame range has the effect of falling the oxygen inerting, the aerocolloidal particulate of resistanceization covers the coal body surface, by absorbing heat, suffocate and the synergy inhibition coal of physical chemistry resistanceization and the combination of oxygen, and consume the free active group that coal oxygen recombination reaction produces, prolonged the spontaneous combustion period of coal.The resistanceization aerosol particles has good suspending power and around the barrier ability, be diffused in a short period of time each position of spontaneous combustion deathtrap, deep, goaf, can also permeate short space when realizing inerting, enter the hidden zone of deep, goaf coal spontaneous combustion, realize comprehensive fire prevention, improved fire prevention efficient.
Aerosol preparation facilities volume provided by the invention is little, simple in structure, easy to operate, security of operation, reliable and stable, use power can adopt normal water supply, the nitrogen-filling system that uses in down-hole, use safety and reliability at highly gassy mine, and to environment and personnel without any negative effect.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is structure diagram of the present invention;
Fig. 3 is the structural representation of pneumatic conveyer of the present invention.
Reference numeral:
1-jet-flow proportioning device; The import of 2-press water; The import of 3-retardant; 4-aerosol atomization plant inlet; The 5-spray chamber; 6-jet-flow proportioning device delivery outlet; The vaporific aerosol of 7-is put delivery outlet; 8-pneumatic conveyor intake; The 9-pneumatic conveyer; The import of 10-pressed gas; 11-pneumatic conveyor delivery outlet; The 12-nozzle; 13-imbibition chamber; The 14-trunnion; The 15-anemostat; The 16-central lumen; The 17-annular chamber; The 18-nozzle ring; The 19-tapping valve; The 20-quick connector; The mining stop valve of 21-; The 22-filter screen; The 23-flow meter.
The specific embodiment
Below in conjunction with accompanying drawing content of the present invention is described in detail.
As depicted in figs. 1 and 2, aerosol preparation facilities of the present invention comprises jet-flow proportioning device, aerosol atomization plant and pneumatic conveyor.The jet-flow proportioning device comprise jet-flow proportioning device 1, the press water import 2 that is connected with jet-flow proportioning device nozzle 12, with the retardant import 3 that jet-flow proportioning device imbibition chamber 13 is connected, jet-flow proportioning device delivery outlet 6 is connected with aerosol atomization plant inlet 4; Aerosol atomization plant comprises spray chamber 5 and the supply terminals that places in the explosion-resistant enclosure, is provided with integrated form ultrasonic atomization plate in the spray chamber, and the vaporific aerosol delivery outlet 7 of spray chamber is connected with pneumatic conveyor intake 8; Pneumatic conveyor comprises pneumatic conveyer 9, the pneumatic conveyor intake that is communicated with pneumatic conveyer, the pressed gas import 10 that is communicated with pneumatic conveyer and pneumatic conveyor delivery outlet 11, pressed gas can be selected nitrogen or carbon dioxide, consider the safety to the staff, preferred nitrogen.
As shown in Figure 2, the jet-flow proportioning device comprises nozzle 12, is positioned at the imbibition chamber 13 of nozzle periphery, the trunnion 14 that is connected with the imbibition chamber and the anemostat 15 that is connected with trunnion, and length of throat is 2 times of trunnion internal diameter; When the pressure of press water was 1～2Mpa, the volume flow ratio of retardant and press water was 1: 3～1: 4.
Because the present invention is when work, aerosol atomization plant can produce liquid in atomization process, affect atomizing work, therefore, also be provided with tapping valve 19, float liquid level switch, explosion-proof solenoid valve on the aerosol atomization plant, when the aerosol atomization plant liquid level transfinites, float liquid level switch output switch amount, close explosion-proof solenoid valve, realize automatic blocking.
As shown in Figure 3, pneumatic conveyer has a central lumen 16 and is positioned at the annular chamber 17 of central lumen periphery, be provided with nozzle ring 18 between the entrance point of annular chamber and central lumen, the pressed gas import links to each other with annular chamber, and the pneumatic conveyor intake links to each other with the entrance point of central lumen.
For pressure and the flow of liquid on the real-time monitored pipeline, prevent that impurity from entering, on the press water inlet pipeline, be provided with mining stop valve, filter screen, flow meter with the retardant inlet pipeline, pipeline enclosure adopts mining quick connector; Be provided with mining stop valve, filter screen on the pipeline of aerosol atomization plant inlet; Be provided with flow meter, mining stop valve on the pressed gas inlet pipeline; The flow of press water and retardant and ratio can utilize mining stop valve to regulate and control.Mining quick connector has been adopted in the termination of each pipeline of the present invention, and the staff can be according to the concrete condition of the colliery degree of depth, increases flexibly, dismantles or device of the present invention is installed.
Embodiment specifies, and pressed gas is take nitrogen as example:
At certain mine, entered the nozzle of jet-flow proportioning device by the press water import with the 1.5Mpa press water, at nozzle exit because the stiction between press water jet and the air, near the nozzle air is taken away, form negative pressure (the flow velocity increase of main flow near making nozzle, potential energy reduces, kinetic energy increases), under the environment atmospheric pressure effect, being pumped retardant liquid is drunk up (volume flow ratio of retardant liquid and press water is 1: 4) through the imbibition chamber, and together enter in the trunnion in company with press water, two bursts of liquid generation momentum-exchanges in trunnion, press water passes to part energy the retardant liquid of being pumped, the press water flow velocity slows down, the retardant liquid velocity of being pumped is accelerated, the speed of two strands of liquid is gradually consistent when arriving the trunnion end, mixed process is finished substantially, form the retardant mixed liquor and enter anemostat, reduce gradually (kinetic energy reduces gradually) at the diffusion velocity in pipes, potential energy (pressure) increases gradually, pressure to anemostat exit retardant mixed liquor is higher than the pressure that the retardant liquid of being pumped flows into trunnion, be lower than the pressure that press water flows into trunnion, last retardant mixed liquor is discharged from the anemostat of DN20mm, flows into aerosol atomization plant.
In aerosol atomization plant, aerosolizable 200kg retardant mixed liquor per hour, be arranged on the integrated form ultrasonic atomization plate in the spray chamber, utilize the intrinsic supersonic oscillations characteristics of ultrasonic atomization oscillator piezoelectric ceramics, the circuit supersonic oscillations, be transferred to the piezoelectric ceramic vibrator sub-surface, piezoelectric ceramic vibrator produces axial mechanical resonance variation and is transferred to the resistance mixing material that is in contact with it, make liquid surface produce protuberance, and around protuberance cavitation occurs, the shock wave that is produced by cavitation will be with the vibration frequency of oscillator constantly repeatedly, make liquid surface produce the capillary wave of finite amplitude, the wave head of this tensile wave disperses, and makes the liquid atomization into the vaporific resistance aerosol that resistance aerosol particles diameter is 1～10 μ m.
As shown in Figures 2 and 3, the vaporific aerosol delivery outlet of spray chamber connects the intake of pneumatic conveyor by the mining quick connector of Φ 32mm, nitrogen-filling system enters annular chamber with the pressure of 0.69MPa by the pressed gas import, spray with high flow velocity by a little ring nozzle, the air-flow that sprays at a high speed in the pneumatic conveyer of aerosol atomization plant will form the Coanda effect region of no pressure (as shown in Figure 3, arrow among Fig. 3 has represented pressed gas and the aerocolloidal trend of vaporific resistanceization), drive the vaporific resistance aerosol in the aerosol atomization plant enters pneumatic conveyer by intake central lumen, mix with pressure nitrogen gas, and by the power of pressure nitrogen gas vaporific resistance aerosol is delivered to goaf (carrying 5～30 times of magnification ratios) from the delivery outlet of aerosol atomization plant, utilize good flow behavior and the transport characteristics of resistanceization aerosol, vaporific resistance aerosol is taken to remote hidden spontaneous combustion deathtrap, and can arrive the high bit space in goaf, especially ideal to prevention goaf " twice two lines " top coal and rib spontaneous combustion effect, form one deck resistanceization film on the coal body surface, the resistanceization constituent of the film has very strong water imbibition, can make coal be in for a long time dampness, reduce the functional group of oxidation of coal reaction or stop radical reaction, oxidation rate is suppressed, prolong coal spontaneous combustion stage, nitrogen is as the power of Compressed Gas, in inerting spontaneous combustion zone, also play the effect that inhibition gas and water-gas fire.
Claims (9)
1. prevent and treat the aerosol preparation facilities of coal spontaneous combustion, it is characterized in that: comprise the jet-flow proportioning device, aerosol atomization plant and the pneumatic conveyor that link to each other successively,
Wherein, the jet-flow proportioning device comprise jet-flow proportioning device, the press water import that is connected with jet-flow proportioning device nozzle, with the retardant import that jet-flow proportioning device imbibition chamber is connected, jet-flow proportioning device delivery outlet is connected with the aerosol atomization plant inlet;
Aerosol atomization plant comprises spray chamber and the supply terminals that places in the explosion-resistant enclosure, is provided with pulverizer plate in the spray chamber, and the vaporific aerosol delivery outlet of spray chamber is connected with the pneumatic conveyor intake;
Pneumatic conveyor comprises pneumatic conveyer, the pneumatic conveyor intake that is communicated with pneumatic conveyer, the pressed gas import that is communicated with pneumatic conveyer and pneumatic conveyor delivery outlet, and described pressed gas is nitrogen or carbon dioxide.
2. the aerosol preparation facilities of control coal spontaneous combustion according to claim 1, it is characterized in that: described jet-flow proportioning device comprises nozzle, is positioned at the imbibition chamber of nozzle periphery, the trunnion that is connected with the imbibition chamber and the anemostat that is connected with trunnion, when the pressure of press water was 1～2Mpa, the volume flow ratio of retardant and press water was 1: 3～1: 4.
3. the aerosol preparation facilities of control coal spontaneous combustion according to claim 1 and 2, it is characterized in that: described pulverizer plate is integrated form ultrasonic atomization plate.
4. the aerosol preparation facilities of control coal spontaneous combustion according to claim 1 and 2, it is characterized in that: press water inlet pipeline and retardant inlet pipeline at the jet-flow proportioning device are respectively equipped with pressure meter, flow meter and filter screen.
5. the aerosol preparation facilities of control coal spontaneous combustion according to claim 1 and 2, it is characterized in that: described pneumatic conveyer has a central lumen and is positioned at the annular chamber of central lumen periphery, be provided with nozzle ring between the entrance point of annular chamber and central lumen, the pressed gas import links to each other with annular chamber, and the pneumatic conveyor intake links to each other with the entrance point of central lumen.
6. aerosol preparation technology who prevents and treats coal spontaneous combustion is characterized in that: may further comprise the steps:
1) preparation of retardant mixed liquor: use the jet-flow proportioning device, with the negative pressure of press water jet generation retardant is sucked, dilute mixing, obtain the retardant mixed liquor;
2) atomizing: with step 1) the retardant mixed liquor that obtains is transported to the aerosol atomization plant processing that atomizes by the jet-flow proportioning device, obtains vaporific resistance aerosol;
3) pneumatic output: use pneumatic conveyor, with pressure nitrogen gas or pressure carbon dioxide gas with step 2) the vaporific resistance aerosol that obtains sucks the pneumatic conveyer of pneumatic conveyor, vaporific resistance aerosol mixes with pressure nitrogen gas or pressure carbon dioxide gas, and by the power of pressure nitrogen gas or pressure carbon dioxide gas vaporific resistance aerosol is outputed to the goaf.
7. technique according to claim 6 is characterized in that: step 1) in the pressure of press water be 1～2Mpa, the volume flow ratio of retardant and press water is 1: 3～1: 4; Step 2) the resistance aerosol particles diameter in after the atomizing is 1～10 μ m.
8. it is characterized in that: step 3 according to claim 6 or 7 described techniques) in the pressure of nitrogen or carbon dioxide gas be: 0.5～0.7MPa.
9. according to claim 6 or 7 described techniques, it is characterized in that: retardant is CaCl
2Solution, MgCl
2Solution, ZnCl
2Solution or Ca (OH)
2Solution.
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|---|---|---|---|
| CN201310234094.4A CN103306706B (en) | 2013-06-13 | 2013-06-13 | Device and process for preparing aerosol for preventing coal from spontaneous combustion |
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|---|---|---|---|
| CN201310234094.4A CN103306706B (en) | 2013-06-13 | 2013-06-13 | Device and process for preparing aerosol for preventing coal from spontaneous combustion |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105240042A (en) * | 2015-09-23 | 2016-01-13 | 太原理工大学 | Method of using phase-changeable sols for preventing spontaneous combustion type fire disasters in coalmine goafs |
| CN106629068A (en) * | 2016-11-21 | 2017-05-10 | 中国核电工程有限公司 | Aerosol distribution device |
| CN106680174A (en) * | 2016-11-21 | 2017-05-17 | 中国核电工程有限公司 | Aerosol distributing and sampling system |
| CN107083987A (en) * | 2017-03-24 | 2017-08-22 | 中国矿业大学(北京) | Prevent and treat the nitrogen resistanceization steam fog preparation method and system of underground goaf spontaneous combustionof coal |
| CN107642373A (en) * | 2017-11-08 | 2018-01-30 | 太原理工大学 | A kind of ultrasonic atomization anion subparticle method for suppressing goaf coal spontaneous combustion |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107083987A (en) * | 2017-03-24 | 2017-08-22 | 中国矿业大学(北京) | Prevent and treat the nitrogen resistanceization steam fog preparation method and system of underground goaf spontaneous combustionof coal |
| CN107642373A (en) * | 2017-11-08 | 2018-01-30 | 太原理工大学 | A kind of ultrasonic atomization anion subparticle method for suppressing goaf coal spontaneous combustion |
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Inventor after: Ma Li Inventor after: Wang Weifeng Inventor after: Wen Hu Inventor after: Jin Yongfei Inventor after: Zhang Xinhai Inventor before: Wen Hu Inventor before: Wang Weifeng Inventor before: Ma Li Inventor before: Jin Yongfei Inventor before: Zhang Xinhai |
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