CN105510175B - A kind of method for determining retardant resistanceization performance - Google Patents
A kind of method for determining retardant resistanceization performance Download PDFInfo
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- CN105510175B CN105510175B CN201510900388.5A CN201510900388A CN105510175B CN 105510175 B CN105510175 B CN 105510175B CN 201510900388 A CN201510900388 A CN 201510900388A CN 105510175 B CN105510175 B CN 105510175B
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Abstract
The invention belongs to underground coal mine to prevent and treat coal spontaneous combustion disaster technical field, more particularly to a kind of method for determining retardant resistanceization performance.The present invention is to calculate resistance rate E of the retardant to Oxygen Adsorption to the difference of the adsorbance of oxygen according to before and after coal sample addition retardant1, then examine resistance rate E of the coal sample to oxygen after the difference of caused CO volumetric concentrations before and after adding retardant calculates coal sample spontaneous combustion2, the two combines analysis, obtains resistance performance of the retardant in whole coal sample spontaneous combustion process.The inventive method is combined with conventional method, inerting effect of the retardant played in whole coal spontaneous combustion oxidizing process can be investigated, change the unilateral of conventional metered dose resistanceization performance methodology, it is combined with the method for traditional measurement resistanceization performance, the resistance efficiency of determination retardant that can be more scientific and reasonable, the selection for retardant in preventing and extinguishing fire of coal mine technical work provide a kind of new method.
Description
Technical field
The invention belongs to underground coal mine to prevent and treat coal spontaneous combustion disaster technical field, more particularly to a kind of measure retardant resistanceization
The method of energy.
Background technology
China's coal-mine Conflagration Caused by Coal Self-ignition accident is extremely serious, and wherein heterogeneous goaf is up to 60% left side of breeding fire
The right side, the fat coal loss amount caused by coal spontaneous combustion are huge.Spontaneous combustionof coal has not only burnt the resource of preciousness, produces substantial amounts of
CO、CO2And SO2Deng toxic and harmful gas, the health and lives of worker are endangered, pollute environment；It is quick-fried that gas, coal dust can also be induced
The generation of fried accident, it is the disaster for hindering Safety of Coal Mine Production.
The oxidation and spontaneous combustion of coal is since physical absorption oxygen under coal low temperature.Because coal is a kind of porous material,
Oxygen molecule produces physisorption in the aperture of coal under normal temperature and pressure conditionses, and physical adsorption process is the mistake of a heat release
Journey, but the heat of adsorption released is smaller.With the progress of absorption, with functional group pendant in coal chemisorption occurs for oxygen,
Substantial amounts of chemisorbed heat is released, if these heats have little time to be discharged into air, will be made in the temperature of coal body
Rise, temperature rise can aggravate the progress of chemical reaction, ultimately result in colliery and spontaneous combustion phenomenon occur.
More common suppression spontaneous combustionof coal method has water filling, is in the milk, closure of leaking out, retardant, presses, indifferent gas at present
The preventing and extinguishing fire technologies such as body, gel.Wherein retardant preventing and extinguishing fire technology is widely applied in spontaneous combustionof coal is suppressed, and is obtained
Good result, retardant have a number of different types, including halogen retardant, ammonium salt retardant, bases retardant, gel retardant,
Anti-oxidant class retardant, compound retardant and foam retardant etc..
At present,《Coal Mine Fire retardant general technical specifications》It is middle regulation retardant resistanceization performance method of testing for
Under specific experiment condition, the difference of CO volumetric concentrations caused by raw coal sample and resistanceization coal sample and CO volumes caused by raw coal sample are examined
The percentage of concentration, i.e.,：
E=(A-B)/A*100；
E in formula --- resistance rate, %；
When A --- coal sample is handled without resistanceization, purge drying air (160mL/ is passed through in (100 DEG C) experiments of temperature rise
The CO released when min) concentration, 10-6；
B --- coal sample is after resistanceization processing, the CO released under above-mentioned the same terms concentration, and 10-6。
In resistance rate definition, certain deficiency be present using 100 DEG C as normal temperature during measure, this method
Place：First, in the case of 100 DEG C, under aerobic environment, oxidation of coal release CO yields are increased over time；Second, resistance
Agent is not only to work at a certain temperature to coal spontaneous combustion resistanceization, but has Inhibition to whole Coal Self-ignition Process,
And differed in different temperatures and its resistanceization effect of period and the mechanism for playing Inhibition.
Another method of testing is during the temperature programmed oxidation of coal, detects sometime raw coal sample and resistanceization coal sample
Temperature difference the resistance performance of retardant is determined with this.The weak point of this method is identical with above-mentioned resistance rate test,
Coal sample temperature difference sometime can not represent resistance effect of the retardant in whole Coal Self-ignition Process.
The content of the invention
For insufficient existing for existing method of testing, the present invention provides a kind of method for determining retardant resistanceization performance, mesh
Be according to the Inhibition of coal adsorption of oxygen process, with reference to it is existing resistance rate method of testing, preferably judge retardant
To preventing and treating Coal Self-ignition Process role, so as to the more comprehensive resistance effect for judging retardant.
Realize that the technical scheme of the object of the invention follows the steps below：
(1) coal sample of selection is processed as coal dust, be put into the adsorbing cylinder of coal adsorption of oxygen detection means, in adsorbing cylinder
Remaining space is full of air, air ambient during spontaneous combustion of simulated coal, gas vent and pressure gauge is housed on adsorbing cylinder, gas goes out
Mouth is connected with gas chromatograph, according to oxygen concentration and pressure change in adsorbing cylinder before and after absorption, is determined under normal temperature and pressure conditionses
Adsorbance A of the coal to oxygen in air；
(2) retardant solution is prepared, it is mixed according to a certain percentage with coal sample, is put into after drying in adsorbing cylinder, is determined
Adsorbance B of the coal after retardant to oxygen in air is added under normal temperature and pressure conditionses, according to right before and after coal sample addition retardant
The difference of the adsorbance of oxygen calculates resistance rate E1, wherein E1=(A-B)/A*100；
(3) preparation and identical retardant solution in step (2), according to《Coal Mine Fire retardant general technical specifications》
Specified in retardant resistanceization performance method of testing, examine coal sample before and after retardant is added caused CO volumetric concentrations it
Difference, calculate resistance rate E2；
(4) E in step (2)1It is resistance efficiency of the retardant to coal adsorption of oxygen before coal sample spontaneous combustion, the E in step (3)2
It is resistance efficiency of the retardant to coal sample combustion process, the two combines analysis, obtains the retardant in whole coal sample spontaneous combustion
During resistance performance.
Compared with prior art, the features of the present invention and beneficial effect are：
The rate method that resistanceization is determined with CO yields in the prior art has investigated retardant during the heating and oxidation of coal
Inerting to oxidation of coal acts on, and the method for the measure retardant group performance of the present invention passes through change of the coal to Oxygen Adsorption amount
Measure resistance rate has then investigated influence of the retardant to coal physical absorption oxygen, because the first step of oxidation and spontaneous combustion is exactly coal to oxygen
Physical and chemical adsorption occurs for gas, therefore Inhibition of the retardant to coal adsorption of oxygen can be judged by this method, in conjunction with existing
There is the resistance rate that the inerting of retardant in technology to oxidation of coal during the heating and oxidation of coal acts on, based on the inventive method,
When choosing retardant, the first step that can suppress coal oxidation should be chosen first --- the retardant of coal adsorption of oxygen effect,
Secondly selection can suppress the retardant that oxidation and spontaneous combustion reaction occurs for coal, make the choosing of retardant in the Temperature Programmed Processes of coal
Take more science comprehensive, there is extensive Social benefit and economic benefit.
The inventive method is combined with conventional method, retardant can be investigated played in whole coal spontaneous combustion oxidizing process
Inerting effect, change the unilateral of conventional metered dose resistanceization performance methodology, be combined with the method for traditional measurement resistanceization performance, energy
The resistance efficiency of enough more scientific and reasonable determination retardants, the selection for retardant in preventing and extinguishing fire of coal mine technical work provide
A kind of new method.
Brief description of the drawings
Fig. 1 is the coal adsorption of oxygen detection means schematic diagram of the present invention；
Wherein 1：Adsorbing cylinder；2：Gas chromatograph；3：Pressure gauge；4：Gas vent；
Fig. 2 is functional group's change infrared spectrogram after the independent coal sample adsorption of oxygen in the embodiment of the present invention；
Fig. 3 be in the embodiment of the present invention addition retardant after coal sample adsorption of oxygen before and after functional group change infrared spectrum
Figure.
Embodiment
The present invention is described further with specific embodiment below in conjunction with the accompanying drawings.
The present embodiment chooses Fuxin Haizhou vertical ore deposit peace upper strata coal sample.
The method of the measure retardant resistanceization performance of the present embodiment, is followed the steps below：
(1) coal sample of selection is processed as the following coal dust of 50 mesh, weighs 1Kg coal dusts and put by broken, grinding, screening
In the adsorbing cylinder 1 for entering coal adsorption of oxygen detection means, the structure of coal adsorption of oxygen detection means in adsorbing cylinder 1 as shown in figure 1, remain
Complementary space is full of air, air ambient during spontaneous combustion of simulated coal, gas vent 4 and pressure gauge 3, gas is housed on adsorbing cylinder 1
Outlet 4 is connected with gas chromatograph 2, according to oxygen concentration and pressure change in adsorbing cylinder before and after absorption, determines normal temperature and pressure bar
1kg coals are 4.79L to the adsorbance of oxygen in air under part；
Using infrared spectrum measurement before and after absorption Mei Zhong functional groups change, as shown in Fig. 2 finding before and after absorption in coal
CH2、CH3Functional group is changed significantly；
(2) MgCl that mass concentration is 20% is prepared2Retardant solution, it is mixed according to mass ratio 4: 1 with 1kg coal samples
Close, stand 12h after stirring, then 40 DEG C of drying 24 hours in vacuum drying chamber, it is put into adsorbing cylinder, measure normal temperature and pressure
Under the conditions of add MgCl2Coal after retardant is 2.05L to the adsorbance of oxygen in air, before and after coal sample addition retardant
Resistance rate E is calculated to the difference of the adsorbance of oxygen1, wherein E1=(4.79-2.05)/4.79*100=57.2%；
The change of the Mei Zhong functional groups of the front and rear addition retardant of absorption using infrared spectrum measurement, as shown in fig. 3, it was found that
CH in coal before and after absorption2、CH3Functional group's amplitude of variation is smaller than the coal sample for being not added with retardant, illustrates the retardant in the present embodiment
Coal inerting can be made, reduce the speed and quantity of coal adsorption of oxygen, so as to prevent the progress that coal spontaneous aoxidizes；
(3) water-bath temperature programming spontaneous combustion of simulated coal process is used, is utilized《Coal Mine Fire retardant general technology bar
Part》Specified in CO yields resistance rate assay method measure resistance rate be E2For 51.5%
Although resistance rate numerical value measured by above two method disagrees, but method of testing is different, therefore can not phase
Mutually relatively.The resistance rate assay method of CO yields has investigated inerting of the retardant to oxidation of coal during the heating and oxidation of coal
Effect, and resistance rate assay method of the coal to Oxygen Adsorption amount has investigated influence of the retardant to coal physical absorption oxygen, at this
It can see in embodiment, by MgCl2Coal sample after processing, its adsorption capacity to oxygen are adsorbed than untreated coal sample
The ability of oxygen is weak, and adsorbance is reduced, because the first step of oxidation and spontaneous combustion is exactly that to oxygen physical and chemical adsorption occurs for coal,
Therefore Inhibition of the retardant to coal adsorption of oxygen can be judged by this method.In addition, by this experimental method and conventional method
It is combined, inerting effect of the retardant played in whole coal spontaneous combustion oxidizing process can be investigated.
Claims (1)
- A kind of 1. method for determining retardant resistanceization performance, it is characterised in that follow the steps below：(1) coal sample of selection is processed as coal dust, be put into the adsorbing cylinder of coal adsorption of oxygen detection means, it is remaining in adsorbing cylinder Space is full of air, air ambient during spontaneous combustion of simulated coal, according to oxygen concentration and pressure change in adsorbing cylinder before and after absorption, surveys Adsorbance A of the permanent normal temperature and pressure Coal Under to oxygen in air；(2) retardant solution is prepared, it is mixed according to a certain percentage with coal sample, is put into after drying in adsorbing cylinder, determines normal temperature The coal after retardant is added under condition of normal pressure to the adsorbance B of oxygen in air, is added according to coal sample before and after retardant to oxygen The difference of adsorbance calculate resistance rate E1, wherein E1=(A-B)/A*100；(3) preparation and identical retardant solution in step (2), according to《Coal Mine Fire retardant general technical specifications》Middle rule The method of testing of fixed retardant resistanceization performance, examine the difference of coal sample caused CO volumetric concentrations before and after retardant is added, meter Calculate resistance rate E2；(4) E in step (2)1It is resistance efficiency of the retardant to coal adsorption of oxygen before coal sample spontaneous combustion, the E in step (3)2It is resistance Resistance efficiency of the agent to coal sample combustion process, the two combines analysis, obtains the retardant in whole coal sample spontaneous combustion process In resistance performance；In above-mentioned steps, gas vent and pressure gauge are housed on described adsorbing cylinder, gas vent is connected with gas chromatograph.
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| EP0069393A1 (en) * | 1981-07-08 | 1983-01-12 | Rheinische Braunkohlenwerke AG. | Method for the early detection of carbonic fires in recipients containing dust of brown coal by detection of methane |
| CN101000333A (en) * | 2006-12-19 | 2007-07-18 | 煤炭科学研究总院重庆分院 | Device for investigating coal self-combustion tendentiousness based on low temp oxidation oxygen consumption |
| CN102539376A (en) * | 2012-01-13 | 2012-07-04 | 中国矿业大学 | Method for determining physical oxygen sorption amount of functional groups on coal surface |
| CN104713899A (en) * | 2015-03-09 | 2015-06-17 | 太原理工大学 | Coal spontaneous combustion tendency identification method based on double-oxygen uptake |
| CN104819910A (en) * | 2015-05-27 | 2015-08-05 | 辽宁工程技术大学 | Experimental device and method for measuring amount of gas adsorbed by large quantity of coal samples under condition of normal pressure |
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- 2015-12-08 CN CN201510900388.5A patent/CN105510175B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| EP0069393A1 (en) * | 1981-07-08 | 1983-01-12 | Rheinische Braunkohlenwerke AG. | Method for the early detection of carbonic fires in recipients containing dust of brown coal by detection of methane |
| CN101000333A (en) * | 2006-12-19 | 2007-07-18 | 煤炭科学研究总院重庆分院 | Device for investigating coal self-combustion tendentiousness based on low temp oxidation oxygen consumption |
| CN102539376A (en) * | 2012-01-13 | 2012-07-04 | 中国矿业大学 | Method for determining physical oxygen sorption amount of functional groups on coal surface |
| CN104713899A (en) * | 2015-03-09 | 2015-06-17 | 太原理工大学 | Coal spontaneous combustion tendency identification method based on double-oxygen uptake |
| CN104819910A (en) * | 2015-05-27 | 2015-08-05 | 辽宁工程技术大学 | Experimental device and method for measuring amount of gas adsorbed by large quantity of coal samples under condition of normal pressure |
Non-Patent Citations (1)
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