CN204422451U - Coal consumption oxygen speed testing device - Google Patents
Coal consumption oxygen speed testing device Download PDFInfo
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- CN204422451U CN204422451U CN201420851930.3U CN201420851930U CN204422451U CN 204422451 U CN204422451 U CN 204422451U CN 201420851930 U CN201420851930 U CN 201420851930U CN 204422451 U CN204422451 U CN 204422451U
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- temperature
- coal
- heat conduction
- oxygen
- measuring equipment
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- 239000003245 coal Substances 0.000 title claims abstract description 77
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 68
- 239000001301 oxygen Substances 0.000 title claims abstract description 68
- 238000012360 testing method Methods 0.000 title claims abstract description 44
- 238000005259 measurement Methods 0.000 claims abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 230000036284 oxygen consumption Effects 0.000 abstract description 24
- 229930194542 Keto Natural products 0.000 description 10
- 125000000468 ketone group Chemical group 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000002269 spontaneous effect Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The utility model discloses a kind of coal consumption oxygen speed testing device, comprise: temperature programme stove, temperature measuring equipment, measuring equipment for oxygen concentration ard and air supply device, at least one is provided with for holding the heat conduction cylindrical shell of coal body in described temperature programme stove, described heat conduction cylindrical shell is connected with described temperature measuring equipment, described measuring equipment for oxygen concentration ard and described air supply device respectively, and described air supply device is also provided with air-flow measurement device.The utility model, by coal consumption oxygen speed testing device, obtains the various parameters under corresponding temperature, is oxygen consumption rate, thus obtains the corresponding relation of temperature and oxygen consumption rate by various Parameter Switch.Because various parameter is controlled, therefore solve oxygen consumption rate in the unit interval under different flow condition and calculate, under identical temperature conditions can be verified, the oxygen consumption rate actual value under different oxygen concentration and leakage intensity.
Description
Technical field
The utility model relates to the test of coal consumption oxygen correlative technology field, particularly a kind of coal consumption oxygen speed testing device.
Background technology
Coal spontaneous combustion is very complicated physics, a chemical change process, and be the exothermic process of changeable autoacceleration, this process is coal oxidation process mainly.Wherein, physical change contains the adsorption and desorption of gas, the evaporation and condensation, heat transfer, the intensification of coal body, the loose of structure etc. of moisture; Chemical change includes various active structure and oxygen generation chemisorption and chemical reaction in coal surface molecule, generates various oxy radical and produces multiple gases, simultaneous thermal effect (having heat release and heat absorption).Due to chemical reaction, the macromolecule internal crosslink bond of coal redistributes, thus make the physics of coal, chemical property changes, and affects coal oxidation process further.Coal oxidation process and exothermic character thereof along with temperature, coal mesoporosity rate and surface area of contacting with air etc. different and different.
Keto consumpting speed is the important indicator evaluating coal spontaneous combustion.Various active structure in coal surface molecule and oxygen generation physics, chemisorption and chemical reaction, and release heat, when oxygen supply is abundant and heat build-up condition is better, the heat accumulation of generation gets up to make coal temperature rise, causes coal spontaneous combustion the most at last.Therefore coal keto consumpting speed just reflects the easy degree of coal spontaneous combustion, and the large then unit interval thermal discharge of coal keto consumpting speed is large, easier spontaneous combustion, and research coal sample keto consumpting speed is significant to Period of Coal Seam Spontaneous Combustion prediction.
But, existing oxygen consumption rate test, in main test coal oxidation process, the ability of unit of coal unit interval internal consumption oxygen, what existing method of testing was simple carry out integration the minimizing curve of oxygen concentration calculates, oxygen consumption rate is not associated with flow parameter, cause data out of true, the actual value of knee point can not be obtained.
Utility model content
Based on this, be necessary in the rate of coal's consuming oxygen measuring technology for prior art, the coarse technical matters of test data, a kind of coal consumption oxygen speed testing device is provided.
A kind of coal consumption oxygen speed testing device, comprise: temperature programme stove, temperature measuring equipment, measuring equipment for oxygen concentration ard and air supply device, at least one is provided with for holding the heat conduction cylindrical shell of coal body in described temperature programme stove, described heat conduction cylindrical shell is connected with described temperature measuring equipment, described measuring equipment for oxygen concentration ard and described air supply device respectively, and described air supply device is also provided with air-flow measurement device.
The utility model, by coal consumption oxygen speed testing device, obtains the various parameters under corresponding temperature, is oxygen consumption rate, thus obtains the corresponding relation of temperature and oxygen consumption rate by various Parameter Switch.Because various parameter is controlled, therefore solve oxygen consumption rate in the unit interval under different flow condition and calculate, under identical temperature conditions can be verified, the oxygen consumption rate actual value under different oxygen concentration and leakage intensity.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of coal consumption oxygen of the utility model speed testing device;
Fig. 2 is the workflow diagram of a kind of coal consumption oxygen testing method adopting above-mentioned coal consumption oxygen speed testing device to carry out of the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in more detail.
Be illustrated in figure 1 the structural representation of a kind of coal consumption oxygen of the utility model speed testing device, comprise: temperature programme stove 1, temperature measuring equipment 2, measuring equipment for oxygen concentration ard 3 and air supply device 4, in described temperature programme stove, 1 is provided with at least one for holding the heat conduction cylindrical shell 5 of coal body, described heat conduction cylindrical shell 5 is connected with described temperature measuring equipment 2, described measuring equipment for oxygen concentration ard 3 and described air supply device 4 respectively, and described air supply device 4 is also provided with air-flow measurement device 6.
Wherein, preferably, temperature measuring equipment 2 is temperature measuring gauge, and measuring equipment for oxygen concentration ard 3 is gas chromatograph, and air-flow measurement device 6 is flowmeter.Wherein, gas componant during fire coal mainly comprises oxygen O
2, carbon monoxide CO, carbon dioxide O
2, methane CH
4, ethane C
2h
6, ethene C
2h
4, acetylene C
2h
2, can oxygen concentration be obtained by gas chromatograph.
Can be obtained the temperature of heat conduction cylindrical shell 5 by temperature measuring equipment 2, by air supply device 4 to heat conduction cylindrical shell 5 air feed, and determine wind supply quantity by air-flow measurement device 6, measuring equipment for oxygen concentration ard 3 then can obtain the oxygen concentration of difference in heat conduction cylindrical shell 5.Calculate the oxygen consumption rate under different temperatures, thus obtain temperature and oxygen consumption rate relation, can be shown by curve mode.
When adding the coal body of different-grain diameter, then can obtain the temperature under different-grain diameter and oxygen consumption rate relation.
In an one embodiment, arrange every device for coal 51 at the top of described heat conduction cylindrical shell 5 or bottom.
The present embodiment is by arranging every device for coal 51 at the top of heat conduction cylindrical shell 5 or bottom, to make ventilation even.
Preferably, described every device for coal 51 be many orders copper mesh.
Preferably, described heat conduction cylindrical shell 5 is copper pipe.
Wherein in an embodiment, described heat conduction cylindrical shell 5 is two, described temperature measuring equipment 2 is connected with two described heat conduction cylindrical shells 5 respectively by two heat-conducting cylinder body examination temperature paths, described measuring equipment for oxygen concentration ard 3 is connected with two described heat conduction cylindrical shells 5 respectively by two test accesss, described air supply device 4 is connected with two described heat conduction cylindrical shells 5 respectively by two air feed paths, and each air feed path 4 arranges air-flow measurement device 6 respectively.
The present embodiment is by two heat conduction cylindrical shells thus carry out contrast test, thus makes test data more accurate.
Wherein in an embodiment, described temperature measuring equipment 2 is also provided with thermometric path in the stove for measuring described temperature programme stove degree.
The temperature of two heat conduction cylindrical shells 5 and temperature programme stove degree measured respectively by temperature measuring equipment 2, in order to regulate temperature programme case internal temperature thus to make coal temperature be controlled better.
Preferably, in described stove, the point for measuring temperature 21 of thermometric path is placed between two described heat conduction cylindrical shells 5.
Be illustrated in figure 2 the workflow diagram of a kind of coal consumption oxygen testing method adopting above-mentioned coal consumption oxygen speed testing device to carry out of the utility model, comprise:
Step S1, described heat conduction cylindrical shell mid-enter the coal body of predetermined size;
Step S2, controls the heating of described temperature programme stove, and sends into preheated air by described air supply device;
Step S3, the temperature of described heat conduction cylindrical shell is measured as heating-up temperature by described temperature measuring equipment, and under being determined at described heating-up temperature by described measuring equipment for oxygen concentration ard, first oxygen concentration of the first test point in described heat conduction cylindrical shell, and the second oxygen concentration of the second test point in described heat conduction cylindrical shell, determine that the horizontal range of described first test point and described second test point is as heating distance, determines to heat wind supply quantity by described air-flow measurement device;
Step S4, according to described first oxygen concentration under described heating-up temperature, described second oxygen concentration, described heating distance, the porosity of described heating wind supply quantity, described coal body and the air feed area of described heat conduction cylindrical shell, determine the oxygen consumption rate that described heating-up temperature is corresponding;
Step S5, if described heating-up temperature does not reach preset requirement temperature, then perform step S3 ~ step S4, until described heating-up temperature reaches preset requirement temperature, thus obtain multiple heating-up temperature, and the oxygen consumption rate corresponding with different heating temperature is as heating-up temperature and oxygen consumption rate relation.
Wherein in an embodiment, also comprise:
Step S6, when described heating-up temperature reaches preset requirement temperature, then described temperature programme stove stops heating, opens the fire door of described temperature programme stove;
Step S7, the temperature of described heat conduction cylindrical shell is measured as falling hot temperature degree by described temperature measuring equipment, and under falling hot temperature degree described in being determined at by described measuring equipment for oxygen concentration ard, the trioxid concentration of the 3rd test point in described heat conduction cylindrical shell, and the 4th oxygen concentration of the 4th test point in described heat conduction cylindrical shell, determine that the horizontal range of described 3rd test point and described 4th test point is as falling hot distance, determines to fall hot wind supply quantity by described air-flow measurement device;
Step S8, according to described described trioxid concentration of falling under hot temperature degree, described 4th oxygen concentration, described in fall heat distance, described in hot wind supply quantity, the porosity of described coal body and the body of heater air feed area of described temperature programme stove fall, the oxygen consumption rate that hot temperature degree is corresponding is fallen described in determining;
Step S9, if described in fall hot temperature degree and do not reach preset stopping temperature, then perform step S7 ~ step S8, until described in fall hot temperature degree and reach preset stopping temperature, thus obtain multiplely falling hot temperature degree, and from different oxygen consumption rate corresponding to hot temperature degree of falling as falling hot temperature degree and oxygen consumption rate relation.
Wherein in an embodiment, also comprise:
Step S10, when described heating-up temperature reaches preset stopping temperature, then changes the coal body of other predetermined size, re-executes step S1 ~ step S9 in described heat conduction cylindrical shell;
Multiple exercise step S10, thus the heating-up temperature obtained under multiple different-grain diameter and oxygen consumption rate relation, and under multiple different-grain diameter, hot temperature degree and oxygen consumption rate relation are fallen.
Oxygen consumption rate V under above-mentioned temperature T
0(T) following formulae discovery can be adopted:
in formula, Q is wind supply quantity, and S is body of heater air feed area, C
ibe the oxygen concentration of i-th test point, C
i+1be the oxygen concentration of the i-th+1 test point, z
i+1-z
ibe the horizontal range of the i-th+1 test point and i-th test point, namely refer to Z in vertical direction
i+1and Z
ibetween distance, n is porosity, and the coal body of different-grain diameter has different porositys.
An example of the present utility model is as follows: proving installation as shown in Figure 1, at two diameter 10cm, in the heat conduction cylindrical shell 5 (being copper pipe in the present example) of long 22cm, loading coal amount 1kg, for making ventilation even, about 2cm free space (adopting 100 order copper mesh to hold coal sample) is left at upper and lower two ends respectively, 100 order copper mesh are namely every device for coal 51, then the interior heating of the temperature programme stove utilizing SCR control temperature is placed in, and send into preheated air, gas ingredients during determination and analysis difference coal temperature, after temperature reaches requirement, stop heating, open fire door, carry out natural convection cooling, and gas ingredients during determination and analysis difference coal temperature.Thus measuring and calculating show that each coal sample is under different-grain diameter, oxygen consumption rate and coal kelvin relation curve.
In mixed coal, the change of each point oxygen concentration is mainly relevant with convection current (air flows), the factor such as (molecular diffusion and turbulent diffusion) and coal oxygen effect oxygen consumption that spreads; Therefore in mixed coal heap, the convective-diffusive equation of oxygen concentration distribution is:
In formula, D is the coefficient of diffusion of oxygen in broken coal; U be distinguished and admirable in space mean flow rate,
the keto consumpting speed that V (T) is unit entity coal, mol/ (cm
3.s).
Under this test condition, because leakage intensity is less, and main centrally direction of principal axis flowing.Therefore, oxygen concentration distribution equation on axis direction can only to be considered in coal body:
So keto consumpting speed is:
According to oxygen concentration and the leakage intensity of measuring point each in test furnace, suppose distinguished and admirable only flowing in the vertical direction and constant flow rate, ignore the diffusion of oxygen in mixed coal and oxygen concentration rate over time, in minute cells, coal temperature is even, then keto consumpting speed V (T) is:
In formula, dZ is the distance of gas flow through micro unit, cm;
Known by chemical kinetics and chemical equilibrium knowledge:
V(T)＝K·C (5)
In formula, C is oxygen concentration; K is chemical reaction constant.
Because keto consumpting speed is directly proportional to oxygen concentration, therefore keto consumpting speed V in fresh air
0(T) be:
Wherein C
0for the oxygen concentration in fresh air, then central axis any two points (Z
1and Z
2) between oxygen utilization:
Both sides integration, when temperature one timing, C
0constant, then:
In formula, Q is wind supply quantity, and S is body of heater air feed area.
Can calculate according to above formula and test data, coal keto consumpting speed and oxygen concentration, coal kelvin relation under fresh air.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (7)
1. a coal consumption oxygen speed testing device, it is characterized in that, comprise: temperature programme stove, temperature measuring equipment, measuring equipment for oxygen concentration ard and air supply device, at least one is provided with for holding the heat conduction cylindrical shell of coal body in described temperature programme stove, described heat conduction cylindrical shell is connected with described temperature measuring equipment, described measuring equipment for oxygen concentration ard and described air supply device respectively, and described air supply device is also provided with air-flow measurement device.
2. coal consumption oxygen speed testing device according to claim 1, is characterized in that, arranges every device for coal at the top of described heat conduction cylindrical shell or bottom.
3. coal consumption oxygen speed testing device according to claim 2, is characterized in that, described every device for coal be many orders copper mesh.
4. coal consumption oxygen speed testing device according to claim 1, is characterized in that, described heat conduction cylindrical shell is copper pipe.
5. coal consumption oxygen speed testing device according to claim 1, it is characterized in that, described heat conduction cylindrical shell is two, described temperature measuring equipment is connected with two described heat conduction cylindrical shells respectively by two heat-conducting cylinder body examination temperature paths, described measuring equipment for oxygen concentration ard is connected with two described heat conduction cylindrical shells respectively by two test accesss, described air supply device is connected with two described heat conduction cylindrical shells respectively by two air feed paths, and each air feed path arranges air-flow measurement device respectively.
6. coal consumption oxygen speed testing device according to claim 5, is characterized in that, described temperature measuring equipment is also provided with thermometric path in the stove for measuring described temperature programme stove degree.
7. coal consumption oxygen speed testing device according to claim 6, is characterized in that, in described stove, the point for measuring temperature of thermometric path is placed between two described heat conduction cylindrical shells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420851930.3U CN204422451U (en) | 2014-12-29 | 2014-12-29 | Coal consumption oxygen speed testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420851930.3U CN204422451U (en) | 2014-12-29 | 2014-12-29 | Coal consumption oxygen speed testing device |
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| Publication Number | Publication Date |
|---|---|
| CN204422451U true CN204422451U (en) | 2015-06-24 |
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ID=53472808
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569027A (en) * | 2014-12-29 | 2015-04-29 | 中国神华能源股份有限公司 | Device and method for testing oxygen consumption rate of coal |
| CN108844995A (en) * | 2018-05-02 | 2018-11-20 | 辽宁工程技术大学 | A kind of coal spontaneous combustion adiabatic oxygenation experimental bench |
-
2014
- 2014-12-29 CN CN201420851930.3U patent/CN204422451U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569027A (en) * | 2014-12-29 | 2015-04-29 | 中国神华能源股份有限公司 | Device and method for testing oxygen consumption rate of coal |
| CN108844995A (en) * | 2018-05-02 | 2018-11-20 | 辽宁工程技术大学 | A kind of coal spontaneous combustion adiabatic oxygenation experimental bench |
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| GR01 | Patent grant |