CN105156147B - A kind of retardant for suppressing high-sulfur coal spontaneous combustion - Google Patents
A kind of retardant for suppressing high-sulfur coal spontaneous combustion Download PDFInfo
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- CN105156147B CN105156147B CN201510584058.XA CN201510584058A CN105156147B CN 105156147 B CN105156147 B CN 105156147B CN 201510584058 A CN201510584058 A CN 201510584058A CN 105156147 B CN105156147 B CN 105156147B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/02—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
- E21F5/06—Fluids used for spraying
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Abstract
The invention belongs to technical field of mine safety, and in particular to a kind of retardant of suppression high-sulfur coal spontaneous combustion.The retardant of the suppression high-sulfur coal spontaneous combustion of the present invention, its composition is by mass percentage：MgCl2 15~17%、ZnCl2 2~5%、NH4Cl 0.1 ~ 0.2%, lauryl sodium sulfate 0.5 ~ 1%, sodium tetraborate 0.3 ~ 0.5%, surplus is aqueous solvent.The retardant of the suppression high-sulfur coal spontaneous combustion of the present invention can ensure the wettability of coal, active structure and oxygen reaction effectively in containment coal, suppress the temperature rise of coal, so as to reach excellent resistance effect.
Description
Technical field
The invention belongs to technical field of mine safety, and in particular to a kind of retardant of suppression high-sulfur coal spontaneous combustion.
Technical background
Spontaneous combustionof coal be it is serious threaten one of disaster of Safety of Coal Mine Production, with sulfur content of coal increase coal from
Combustion tendentiousness also increases.The retardant that current colliery is used has many kinds, including high score subclass retardant, such as carbamide peroxide
Strong oxidizer, can will be particularly the structure and radical oxidation that are easy to oxidation that coal body surface is present, form steady in coal structure
Fixed material, loses oxidisability, so that no longer with oxygen oxidation reaction occurs for coal body, improves security；Also include gel-like to hinder
Agent, mainly there is sodium alginate, waterglass, high hydroscopic resin etc., and this kind of retardant is, in coal surface formation film, to make using colloid
Coal body comes to reach the effect of resistanceization with the oxygen isolation in air；Also inorganic salts retardant, mainly there is magnesium chloride, chlorination
Sodium, sodium sulphate isohydric solvent, the aqueous solution of this kind of material can absorbing and cooling temperature, starvation, water suction moisturizing, while these molecules
Interaction will be produced with coal molecule, so as to suppress low-temperature oxidation of coal.But these retardant passivation for suppressing coal spontaneous combustion are lived
The specific aim of property group is not strong, selects retardant not according to the species and property of the specific active group of coal, retardant
Effect by extreme influence.
The content of the invention
To overcome the deficiencies in the prior art, the present invention provides a kind of retardant for suppressing high-sulfur coal spontaneous combustion, it is therefore an objective to be directed to
The high characteristic of coal sulfur content, by adding Zn in retardant2+, make itself and S atom formation complex, inerting sulfur content in coal in coal
Structure, so as to efficiently suppress high-sulfur coal spontaneous combustion.
The retardant of the suppression high-sulfur coal spontaneous combustion of the object of the invention is realized, its composition is by mass percentage：MgCl2 15~
17%、ZnCl2 2~5%、NH4Cl 0.1 ~ 0.2%, lauryl sodium sulfate 0.5 ~ 1%, sodium tetraborate 0.3 ~ 0.5%, surplus is solvent
Water.
Compared with prior art, the features of the present invention and beneficial effect are：
Oxidation of coal hypergolic reaction process is divided into dehydration zero-g period, oxidation weight gain stage and burning weight loss stage, the present invention
Retardant can suppress high-sulfur coal spontaneous combustion mechanism be increase coal humidity, suppress coal adsorption of oxygen（Including physical absorption and
Chemisorbed）, before ignition temperature are reached, active structure and oxygen reaction in the wettability of coal, containment coal are ensured, suppresses coal
Temperature is raised, so as to reach resistanceization effect.
MgCl2Easy deliquescence, with good hygroscopicity, can increase the humidity of coal, improve the dry and cracked temperature of coal, be lost in coal
Inhibition very big from the water zero-g period, and Mg2+With active structure in coal, the active structure containing S of such as sulphur coal occurs mutually
Effect, from inhibitory activity structure adsorption of oxygen, therefore controls MgCl in the present invention2Concentration be 15 ~ 17%, reach optimal resistanceization
Effect.
ZnCl2Hygroscopicity be not so good as MgCl2, but Mg2+Mutual rental with active structure in coal is very weak, suppresses adsorption of oxygen
Effect is not strong.Zn2+Easily with forming complex containing S, O and N isoreactivity structure in coal, so as to suppress these active structures absorption oxygen
Gas, very big inhibition is played in the oxidation of coal weightening stage, therefore, the ZnCl in the present invention2Concentration reaches 2 ~ 5%.
NH4Cl is a kind of with hygroscopic strong electrolyte, is dissolved in water power and separates out NH4 +And Cl-, played in retardant
Aid in Zn2+Effect, therefore NH in the present invention4Cl concentration is 0.1 ~ 0.2%.
Lauryl sodium sulfate is a kind of surfactant, can reduce the surface tension between retardant and coal, increase
Its concentration is 0.5 ~ 1% in the wetability of retardant, the present invention.
Sodium tetraborate is a kind of corrosion inhibiter, can be to prevent or slow down the chemicals attack underground equipment of corrosion, this hair
It is 0.3 ~ 0.5% that its concentration is required in bright.
Under the synergy of above-mentioned several components, the retardant of suppression high-sulfur coal spontaneous combustion of the invention can ensure coal
Active structure and oxygen reaction in wettability, effectively containment coal, suppress the temperature rise of coal, so as to reach excellent resistanceization effect
Really.
Brief description of the drawings
Fig. 1 is the TG of raw coal sample（Thermogravimetric）Curve；
Fig. 2 is that embodiment 1 adds the TG curves that retardant invades the coal sample steeped.
Embodiment
Thermogravimetric analyzer is integrated using STA449C types-TG/DAT in the embodiment of the present invention and determines coal sample temperature programming condition
Under TG curves.
The mass content of sulphur is 3.31% in the raw coal used in the present invention.
Embodiment 1
The retardant of the suppression high-sulfur coal spontaneous combustion of the present embodiment, its composition is by mass percentage：MgCl2 15%、ZnCl2
3%、NH4Cl 0.2%, lauryl sodium sulfate 0.5%, sodium tetraborate 0.3%, surplus is aqueous solvent.
According to the resistance effect of the TG tracing analysis retardants under the conditions of coal sample temperature programming, detailed process is as follows：
Raw coal sample is crushed with ball mill first, then is sieved with sub-sieve and takes raw coal sample that granularity is 0.150mm as experiment
Raw coal sample, loads port grinding bottle standby.
Raw coal sample 1000mg is weighed, the retardant solution 1ml prepared is measured, raw coal sample is sufficiently mixed with retardant,
Shady and cool, ventilation is placed in, after standing 7, thermogravimetric test analysis is carried out, experiment heating rate is 5 DEG C/min, reacting gas O2With
Carrier gas N2Flow velocity is respectively 10ml/min and 30ml/min, and sample quality is 15mg, and range of reaction temperature is 25 ~ 600 DEG C.
Such as the TG curves that Fig. 1 is raw coal sample, such as Fig. 2 ties to add the TG curves that retardant invades the coal sample steeped to experiment
Fruit analyze obtaining as drawn a conclusion：
（1）It will be seen from figure 1 that 25 ~ 121.3 DEG C are the oxidation of coal spontaneous combustion dehydration stage；121.4 ~ 331.3 DEG C are oxidation of coal
Spontaneous combustion is increased weight the stage；From 331.4 DEG C backward, it is the burning weight loss stage of oxidation of coal spontaneous combustion；
（2）Figure it is seen that 25 ~ 237.7 DEG C are the oxidation of coal spontaneous combustion dehydration stage；237.8 ~ 310.4 DEG C are oxidation of coal
Spontaneous combustion is increased weight the stage；From 310.4 DEG C backward, it is the burning weight loss stage of oxidation of coal spontaneous combustion；
（3）According to the action principle of retardant, mainly in oxidation of coal spontaneous combustion dehydration stage and oxidation and spontaneous combustion weightening stage
Work, the oxidation and spontaneous combustion dehydration stage for the raw coal sample soaked by the retardant of the present embodiment is deferred to 237.8 from 121.3 DEG C
DEG C, and the activation energy in oxidation and spontaneous combustion weightening stage increases to 259.70 kJ/mol by 112.20 kJ/mol, effectively prevents height
The spontaneous combustion of sulphur coal.
Embodiment 2
The retardant of the suppression high-sulfur coal spontaneous combustion of the present embodiment, its composition is by mass percentage：MgCl2 16%、ZnCl2
5%、NH4Cl 0.1%, lauryl sodium sulfate 0.8%, sodium tetraborate 0.4%, surplus is aqueous solvent.
Through same thermogravimetric analysis experimentation, the oxidation and spontaneous combustion for the raw coal sample soaked by the retardant of the present embodiment loses
The water stage is deferred to 238.1 DEG C from 121.3 DEG C, and the activation energy in oxidation and spontaneous combustion weightening stage is increased to by 112.20 kJ/mol
262.70 kJ/mol, effectively prevent the spontaneous combustion of sulphur coal.
Embodiment 3
The retardant of the suppression high-sulfur coal spontaneous combustion of the present embodiment, its composition is by mass percentage：MgCl2 17%、ZnCl2
2%、NH4Cl 0.15%, lauryl sodium sulfate 1%, sodium tetraborate 0.5%, surplus is aqueous solvent.
Through same thermogravimetric analysis experimentation, the oxidation and spontaneous combustion for the raw coal sample soaked by the retardant of the present embodiment loses
The water stage is deferred to 237.8 DEG C from 121.3 DEG C, and the activation energy in oxidation and spontaneous combustion weightening stage is increased to by 112.20 kJ/mol
259.56 kJ/mol, effectively prevent the spontaneous combustion of sulphur coal.
Claims (1)
1. a kind of retardant for suppressing high-sulfur coal spontaneous combustion, its composition is by mass percentage：Lauryl sodium sulfate 0.5 ~ 1%, four
Boratex 0.3 ~ 0.5%, it is characterised in that：MgCl2 15~17%、ZnCl2 2~5%、NH4Cl 0.1 ~ 0.2%, surplus is aqueous solvent.
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| CN105156147B true CN105156147B (en) | 2017-08-29 |
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| CN107035398B (en) * | 2017-06-16 | 2019-02-12 | 中国矿业大学 | A kind of compound retardant of physical-chemical and its preparation and application for preventing and treating low order coal spontaneous combustion |
| CN109957434B (en) * | 2019-03-27 | 2021-08-10 | 中国矿业大学 | Inhibitor for inhibiting spontaneous combustion in upgraded lignite stacking and storing process and preparation and use methods thereof |
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| CN101487399B (en) * | 2008-07-29 | 2011-06-08 | 辽宁工程技术大学 | Stopping agent for preventing coal self-ignition and its production and use method |
| CN101766877B (en) * | 2010-02-05 | 2011-06-22 | 北京科技大学 | Inorganic salt type inhibitor for preventing and controlling spontaneous combustion of residual coal in goaf of coal mine |
| RS20100504A3 (en) * | 2010-11-18 | 2013-10-31 | Capitol W.B.C. D.O.O. | Procedure to obtain means for fire prevention impregnation of porous materials and deep fire extinguishing of so-called smouldering fire in peat lands, coal and municipal waste landfills |
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