CN106644803A - Method for determining optimal fireproof critical moisture content in hydrated coal dewatering process - Google Patents
Method for determining optimal fireproof critical moisture content in hydrated coal dewatering process Download PDFInfo
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- CN106644803A CN106644803A CN201610961198.9A CN201610961198A CN106644803A CN 106644803 A CN106644803 A CN 106644803A CN 201610961198 A CN201610961198 A CN 201610961198A CN 106644803 A CN106644803 A CN 106644803A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
- G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
Abstract
A method for determining optimal fireproof critical moisture content in the hydrated coal dewatering process comprises the steps of collecting hydrated coal samples, crushing and then drying the hydrated coal samples, and taking out two coal samples simultaneously each time, wherein one coal sample is used for determining water contents, and the other coal sample is used for obtaining thermogravimetric curves and characteristic temperatures of the coal samples under different water contents by adopting a TG-DSC method; according to the thermogravimetric curves and the characteristic temperatures, adopting a gas-solid reaction dynamical model to respectively calculate activation energy of each coal sample at different reaction stages; bringing the characteristic temperatures and activation energy data into an Arrhenius model of coal oxidation reaction rate to calculate natural ignition time of the coal samples under each water content; comparing natural ignition time of the series of coal samples having different water contents, and obtaining variation trend curves of the natural ignition time of the coal samples along with the water contents, wherein the water content of the coal sample corresponding to the minimum of the natural ignition time obtained from the variation trend curves is the optimal fireproof critical moisture content in the hydrated coal dewatering process of a coal mine area.
Description
Technical field
The present invention relates to the determination method of the optimal fire prevention critical moisture content of coal monitoring technical field, and in particular to a kind of aquation
The determination method of optimal fire prevention critical moisture content in coal hydrophobic process.
Background technology
Coal is a kind of nonrenewable resources, and the coal consumption of China accounts for exhausted vast scale in disposable energy resource consumption, about
70%, in China's energy resource structure in the highest flight, play the role of very important.With the fast development of China's economic construction, coal
Charcoal becomes the indispensable energy goods and materials for concerning economic life line of the country.Since reform and opening-up, the fast development of Coal Industrial
Provide safeguard for AND ENERGY RESOURCES CONSUMPTION IN CHINA, further reduce the problem of the interdependent external import of the energy.National primary energy disappears within 2015
Take total amount and mark coals for 4,300,000,000 tons, wherein consumption of coal accounts for 64.4%, it is contemplated that will also account for more than 50% to the year two thousand fifty.Therefore, exist
From now in longer period of time, coal will be the main energy sources of China.
China's coal-mine is affected especially pronounced by spontaneous combustion, and more than 60% colliery all has spontaneous combustion danger.According to system
Meter, in China's coal-mine fire incident, Conflagration Caused by Coal Self-ignition accounts for the overwhelming majority, and about 94%, and in mine self caused fire, it is mined out
Area's freely burning fire accounts for 60% or so.Main producing coal country of the world all suffers from different degrees of coal spontaneous combustion disaster.1950-1977,
The coal spontaneous combustion disaster that the U.S. occurs accounts for the 11% of coal-mine fire sum；1990-2007, in 138 colliery fire that the U.S. occurs
In the middle of calamity, there is more than 20 to be coal spontaneous combustion fire；1972-2004, Queensland ,Australia there occurs 51 coal spontaneous combustion fire, its
In 3 caused serious explosion accident, cause 41 people wrecked；1947-2014, the coal spontaneous combustion fire that Poland occurs accounts for colliery
The 79% of fire sum；In India, coal spontaneous combustion has caused 80% coal-mine fire.Down-hole some more hidden be difficult monitoring and visit
The region of survey is easiest to spontaneous fire in coal mine, such as pressurized broken coal column, caving place and goaf region, goaf
Belong to semi-open space, air flow is slow, heat is easy to accumulation, fully mechanized coal face something lost coal distribution is more, and mining height is larger, longitudinal direction
Space is big, and on the whole danger zone spatially formula distribution, is the main region of spontaneous combustion.
At present, the emphasis of Chinese scholars research is concentrated mainly on the ignition quality change of coal during water logging coal, and coal
After being immersed in water, the aquation coal of formation can form secondary pore in hydrophobic process, coal body porosity is further increased.Coal
Ore mining area occurs after fire emergency, often takes with the closed exploiting field of water seal, breaks seal again again after or elimination stable etc. the condition of a fire
Exploiting field.Now the coal in exploiting field is immersed in water and defines aquation coal, and during exploiting field unpacking discharges water, i.e., aquation coal in exploiting field is hydrophobic
Process, in this process the moisture of aquation coal there is the impact of double action to oxidation of coal reaction, when moisture content is low, Shao Liangshui
Dividing can directly participate in oxidation of coal reaction, produce water oxygen complex compound, and water oxygen complex compound has facilitation to oxidation of coal reaction, and aqueous
When rate is high, moisture can form one layer of aqueous film in coal body pore surface, hinder the contact of coal oxygen, and excess water evaporation to take away
Amount of heat, further suppresses oxidation of coal reaction.Aquation coal spontaneous combustion is higher, and auto-ignition event easily occurs.The daily production in colliery
The unrestrained water in exploiting field should suitably be reduced in management, keep moisture in coal body more than fire prevention critical moisture content, to be conducive to prolongation to adopt
The spontaneous fire time of area's aquation coal.Therefore, the optimal fire prevention critical moisture content in aquation coal hydrophobic process is studied to mine district
The aspects such as the hydrophobic and exploiting field preventing and extinguishing fire technology in the unpacking of water seal region or permeable region have to be used for reference and directive significance.
The content of the invention
In order to further improve the hydrophobic and exploiting field preventing and extinguishing fire technology of the unpacking of mine district water seal region or permeable region,
The research of the optimal fire prevention critical moisture content in for aquation coal hydrophobic process is blank, and the present invention provides a kind of aquation coal hydrophobic process
In optimal fire prevention critical moisture content determination method.The technical scheme is that：
The determination method of optimal fire prevention critical moisture content, comprises the following steps in a kind of aquation coal hydrophobic process：
（1）Aquation coal sample is gathered in the permeable region in mine district, is crushed to after 20 ~ 80 mesh and is divided at least 10 parts, at 30 ~ 50 DEG C
At a temperature of be dried, per part of drying time increases successively 10min, same every time wherein the drying time of first part of coal sample is 0min
When take out two parts of coal samples；
（2）The two parts of coal samples taken out simultaneously every time, portion obtains a series of different water cut numbers for determining moisture content
Value；Simultaneously another coal sample is adopted into TG-DSC methods to heat up with the speed of 5 ~ 10 DEG C/min, obtain coal sample under different water cut
Thermogravimetric curve and characteristic temperature；
（3）According to the thermogravimetric curve and characteristic temperature of a series of this coal sample, calculated respectively respectively using gas-solid reaction kinetic model
The activation energy in individual coal sample differential responses stage；
（4）Bring the activation energy data of the characteristic temperature of each moisture content coal sample, differential responses stage into oxidation of coal reaction rate
Arrhenius model calculate spontaneous fire time of the coal sample under each moisture content；
（5）A series of spontaneous fire time of this different water cut coal sample is contrasted, the coal sample spontaneous fire time is obtained with moisture content
Change trend curve, and the corresponding coal sample of spontaneous fire time minimum obtained in the change trend curve is aqueous
Rate is the optimal fire prevention critical moisture content in the mine district aquation coal hydrophobic process.
In said method, the characteristic temperature of the coal sample is aquation coal sample initial temperature, physics oxygen uptake temperature, dehydration temperature
The general name of degree, chemical oxygen uptake temperature, ignition temperature and Burn-out temperature this 6 kinds of temperature.
In said method, the coal sample differential responses stage includes：Physics oxygen uptake stage, dehydration stage, chemical oxygen uptake rank
Section, catch fire the stage.
Beneficial effects of the present invention are：The present invention can quickly determine optimal fire prevention critical moisture content in hydrophobic process, be suitable for
Property it is strong, the aspects such as the hydrophobic and exploiting field preventing and extinguishing fire technology in the unpacking of mine district water seal region or permeable region are had use for reference with
Directive significance.
Description of the drawings
TG-DSC curves when Fig. 1 is 0min for the coal sample drying time of the specific embodiment of the invention.
Fig. 2 is the TG curve maps of typical gas-solid reaction, wherein,It is sample quality, g；It is thermodynamic temperature, K；A
（Gu）It is sample；B（Gu）It is that sample A occurs the residue after gas-solid reaction；It is sample initial mass, g；It is the reaction time
ForT(t)The mass loss amount at moment, g；It is quality Maximum loss of the sample in reaction interval, g；It is that sample is residual
Deposit quality.
Fig. 3 is the change curve of the coal sample spontaneous fire time with coal sample moisture content of the specific embodiment of the invention.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in further details with specific embodiment, described is the solution to the present invention
Release rather than limit.
The determination method of optimal fire prevention critical moisture content, comprises the following steps in a kind of aquation coal hydrophobic process：
（1）Aquation coal sample is gathered in the permeable region in Shanxi mine district, is crushed to after 30 ~ 50 mesh and is divided into 10 parts, at 30 ~ 50 DEG C
At a temperature of be dried, per part of drying time increases successively 10min, wherein the drying time of first part of coal sample is 0min, every time
Two parts of coal samples are taken out simultaneously；
（2）The two parts of coal samples taken out simultaneously every time, portion obtains a series of different water cut numbers for determining moisture content
Value；Simultaneously another coal sample is adopted into TG-DSC methods to heat up with the speed of 10 DEG C/min, obtain the heat of coal sample under different water cut
Weight curve and characteristic temperature；The characteristic temperature of the coal sample is aquation coal sample initial temperature（T0）, physics oxygen uptake temperature（T1）, lose
Coolant-temperature gage（T2）, chemical oxygen uptake temperature（T3）, ignition temperature（T4）And Burn-out temperature（T5）The general name of this 6 kinds of temperature, and adding
In thermal process, coal sample experiences successively physics oxygen uptake stage, dehydration stage, chemical oxygen uptake stage, this 4 reaction ranks of the stage of catching fire
Section, table 1 gives different water cut coal sample in the characteristic temperature corresponding to the differential responses stage；
The different water cut coal sample of table 1 is in the characteristic temperature corresponding to the differential responses stage
Note：TG-DSC curves when Fig. 1 is 0min there is provided coal sample drying time.
（3）According to the thermogravimetric curve and characteristic temperature of a series of this coal sample, pushed away respectively using gas-solid reaction kinetic model
Calculate the activation energy in each coal sample differential responses stage；Detailed process is：
Coal spontaneous combustion belongs to the thermogravimetric curve of typical gas-solid reaction, as shown in Fig. 2 coal sample mass changeMeet below equation
Formula：
, [1]
[1] in,It is the initial mass of coal sample, g；Be coal sample remaining quality, g；It is the reaction time to beT（t）Moment
Coal sample quality, g；It is the coal sample reaction time to beT(t)The mass loss amount at moment, g；It is coal sample in reaction interval
Quality Maximum loss, g；
Then the decomposition rate of coal sample is：
, [2]
[2] in,It is the heat time（That is drying time）, min；It is pre-exponential factor, min-1；It is reaction activity, KJ/
mol；It is gas universal constant, 8.314 × 10-3KJ/mol·K；It is heating-up temperature, K；Being one can reflect
The function of the reaction mechanism of coal spontaneous combustion oxidizing process；
And coal sample meets below equation in the heating rate of temperature-rise period：, [3]
[3] in,It is heating rate；It is heating-up temperature, K；Bring formula [3] into formula [2] to obtain：
, [4]
The right and left of formula [4] is arrived respectively 0WithArriveBetween be integrated conversion, obtain：
, [5]
Formula [5] left side is conversion ratio functional integration, and the right is temperature point, and formula [5] carries out Time Continuous integration can not be solved
Analysis solve, can only approximate solution, using Coats-Redfern integration methods solve, through approximate solution, obtained such as lower integral：
, [6]
[6] in,For the integral function of TG curves, because coal sample is 1 grade in the reaction Kinetics Model of 4 stages of reaction
Reaction, therefore, [7]
With 1 order reaction series model --- formula [7], byIt is rightMapping, obtains different water cut coal sample
In the matched curve that relevant temperature is interval, activation of the coal sample in the differential responses stage is calculated by straight slope-E/R and intercept
Can, as a result as shown in table 2；
Activation energy of the different water cut coal sample of table 2 in the differential responses stage
（4）Bring the activation energy data of the characteristic temperature of each moisture content coal sample, differential responses stage into oxidation of coal reaction rate
Arrhenius model calculate spontaneous fire time of the coal sample under each moisture content；Detailed process is：
Oxidation of coal reaction rate represented using Arrhenius, i.e.,：
, [8]
[8] in,It is the oxidation rate of the whole stage of reaction of coal sample, K/s；It is pre-exponential factor, min-1；It is activation energy,
KJ/mol；It is gas constant, 8.314 × 10-3 KJ·mol-1·K-1；It is heating-up temperature, K.
Can be calculated by formula [8]：
, [9]
[9] in,For temperature rising value, K；To react initial time, s；For ignition temperature corresponding time, s；For
The oxidation rate of the whole stage of reaction of coal, K/s approximately replaces entirely reacting using the oxidation rate mean value of all stage
Oxidation rate in journey, then solves respectively T0-T1、T1-T2、T2-T3、T3-T4Time needed for four-stage reaction, respectively
With、、、Represent, finally give the different water cut coal sample spontaneous fire timeFor：
, [10]
As a result it is as shown in table 3：
The different water cut coal sample spontaneous fire time of table 3
| Coal sample number | Drying time/min | Moisture content/% | The spontaneous fire time/d |
| 1 | 0 | 23.06 | 133 |
| 2 | 10 | 18.23 | 71 |
| 3 | 20 | 14.87 | 44 |
| 4 | 30 | 13.75 | 49 |
| 5 | 60 | 12.45 | 36 |
（5）A series of spontaneous fire time of this different water cut coal sample in contrast table 3, obtain continuous with coal sample moisture content
Reduce, the corresponding coal sample spontaneous fire time is first to reduce to increase a kind of change trend curve for reducing again afterwards, as shown in figure 3,
And the change trend curve first reduce increase afterwards obtained in this section of curve spontaneous fire time minimum correspondence
The moisture content of coal sample be optimal fire prevention critical moisture content in the mine district aquation coal hydrophobic process, i.e., 14.87%, dredging
Need to keep under strict control during water coal moisture content more than 14.87%.
Claims (3)
1. the determination method of critical moisture content of most preferably preventing fires in a kind of aquation coal hydrophobic process, it is characterised in that comprise the following steps：
（1）Aquation coal sample is gathered in the permeable region in mine district, is crushed to after 20 ~ 80 mesh and is divided at least 10 parts, at 30 ~ 50 DEG C
At a temperature of be dried, per part of drying time increases successively 10min, same every time wherein the drying time of first part of coal sample is 0min
When take out two parts of coal samples；
（2）The two parts of coal samples taken out simultaneously every time, portion obtains a series of different water cut numbers for determining moisture content
Value；Simultaneously another coal sample is adopted into TG-DSC methods to heat up with the speed of 5 ~ 10 DEG C/min, obtain coal sample under different water cut
Thermogravimetric curve and characteristic temperature；
（3）According to the thermogravimetric curve and characteristic temperature of a series of this coal sample, calculated respectively respectively using gas-solid reaction kinetic model
The activation energy in individual coal sample differential responses stage；
（4）Bring the activation energy data of the characteristic temperature of each moisture content coal sample, differential responses stage into oxidation of coal reaction rate
Arrhenius model calculate spontaneous fire time of the coal sample under each moisture content；
（5）A series of spontaneous fire time of this different water cut coal sample is contrasted, the coal sample spontaneous fire time is obtained with moisture content
Change trend curve, and the corresponding coal sample of spontaneous fire time minimum obtained in the change trend curve is aqueous
Rate is the optimal fire prevention critical moisture content in the mine district aquation coal hydrophobic process.
2. the determination method of critical moisture content of most preferably preventing fires in a kind of aquation coal hydrophobic process according to claim 1, it is special
Levy be the characteristic temperature of the coal sample be aquation coal sample initial temperature, physics oxygen uptake temperature, dehydration temperature, chemical oxygen uptake temperature
The general name of degree, ignition temperature and Burn-out temperature this 6 kinds of temperature.
3. the determination method of critical moisture content of most preferably preventing fires in a kind of aquation coal hydrophobic process according to claim 1, it is special
Levy is to include in the coal sample differential responses stage：Physics oxygen uptake stage, dehydration stage, chemical oxygen uptake stage, the stage of catching fire.
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| CN114247725B (en) * | 2021-12-03 | 2023-07-18 | 内蒙古科技大学 | Method for activating coal gangue through subcritical/supercritical water oxidation |
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Application publication date: 20170510 |