AU2022202143B2 - Detection system and method for mark gas of coal spontaneous ignition and gas storage device - Google Patents
Detection system and method for mark gas of coal spontaneous ignition and gas storage device Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 68
- 238000001514 detection method Methods 0.000 title claims abstract description 63
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000003647 oxidation Effects 0.000 claims abstract description 49
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 49
- 239000007789 gas Substances 0.000 claims description 316
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 47
- 230000007246 mechanism Effects 0.000 claims description 42
- 238000004458 analytical method Methods 0.000 claims description 32
- 238000004140 cleaning Methods 0.000 claims description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000002474 experimental method Methods 0.000 claims description 15
- 238000005070 sampling Methods 0.000 claims description 15
- 238000004088 simulation Methods 0.000 claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004587 chromatography analysis Methods 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 4
- 238000011105 stabilization Methods 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000002372 labelling Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000000429 assembly Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
Provided is a detection system and method for a mark gas of coal spontaneous ignition.
The detection system includes pipelines; gas valves; a flow controller; two gas source
components, connected to the flow controller; a chromatographic analyzer; an exhaust valve;
5 an oxidation furnace, connected to the chromatographic analyzer and the exhaust valve; a gas
storage device, connected to the chromatographic analyzer and the exhaust valve; and a
computer, electrically connected to the gas source components, the flow controller, the
oxidation furnace, the gas storage device, the chromatographic analyzer, the exhaust valve
and the gas valves. The flow controller, the oxidation furnace and the gas storage device are
10 connected to each other.
104
ninth pipeline tenth pipeline
fourth pipeline thirteenth pipeline
foreenth
102 pipeline
third pipeline fifth pipeline eleventh pipeline
second twelfth pipeline fifteenth pipeline
first pipeline pipeline
seventh pipeline eighth pipeline
sixth pipeline sixteenth pipeline
101 - -G
1 ~103 1105
FIG.1I
Description
ninth pipeline tenth pipeline
fourth pipeline thirteenth pipeline foreenth 102 pipeline third pipeline fifth pipeline eleventh pipeline
second twelfth pipeline fifteenth pipeline first pipeline pipeline
seventh pipeline eighth pipeline sixth pipeline sixteenth pipeline
101 - -G
1 ~103 1105
FIG.1I
The present disclosure relates to a technology field of coal mine disaster preventions, and
more particularly to a detection system and a method for a mark gas of coal spontaneous
ignition and a gas storage device.
An existing mark gas experiment for coal spontaneous ignition generally uses a mark gas
experimental device for the coal spontaneous ignition. In the existing experiment, an amount
of air flow or oxygen flow is uniformly and fully in contact with a coal sample, the coal
sample is heated to a certain temperature through a heating procedure, and composition and
content of gas released from the coal sample are detected by a chromatographic analyzer or
other devices to obtain a result showing a change of the released gas as the temperature is
increased. In this way, a specific type of the mark gas may be elected, and a quantitative
relationship between a content of a mark gas and a respective coal temperature may be
established. After the coal sample is continuously oxidized and heated to a certain temperature,
a heating rate of the coal sample will be significantly accelerated, and a gas generation rate
_0 will also be accelerated.
Due to a constant analysis efficiency of the chromatographic analyzer, a time interval for
sampling and analyzing the gas sample is constant. However, in the simulation experiment for
the coal spontaneous ignition, when the temperature reaches a certain value, the gas
generation rate accelerates with the acceleration of the coal heating rate, and processes of
heating the coal sample and generating gas are continuous.
Therefore, the sampling rate cannot keep up with the generation rate of the gas sample
during the experiment, resulting in inadequate sample amount for analysis, insufficient and
incomplete analysis results. There is a large deviation between the analysis result and an
actual output in temperature and time.
In order to achieve the above-mentioned object, a detection system and a detection
method for a mark gas of coal spontaneous ignition and a gas storage device are provided.
In embodiments of a first aspect of the present disclosure, a detection system for a mark
gas of coal spontaneous ignition is provided. The detection system includes: pipelines,
including a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline,
a sixth pipeline, a seventh pipeline, an eighth pipeline, a ninth pipeline, a tenth pipeline, an
eleventh pipeline, a twelfth pipeline, a thirteenth pipeline, a fourteenth pipeline, a fifteenth
pipeline and a sixteenth pipeline; gas valves, being electronically controlled three-way valves,
and including a first gas valve, a second gas valve, a third gas valve, a fourth gas valve, a fifth
gas valve and a sixth gas valve; a flow controller; two gas source components, connected to
the flow controller; a chromatographic analyzer; an exhaust valve; an oxidation furnace,
connected to the chromatographic analyzer and the exhaust valve; a gas storage device,
connected to the chromatographic analyzer and the exhaust valve; and a computer, electrically
connected to the gas source components, the flow controller, the oxidation furnace, the gas
storage device, the chromatographic analyzer, the exhaust valve and the gas valves. The flow
controller, the oxidation furnace and the gas storage device are connected to each other. The
first pipeline and the second pipeline are connected to the two gas source components,
respectively; the flow controller is connected between the third pipeline and the fourth
-0 pipeline; the fifth pipeline and the sixth pipeline are connected to an input end and an output
end of the oxidation furnace, respectively; the tenth pipeline and the thirteenth pipeline are
connected to an input end and an output end of the gas storage device, respectively; the
sixteenth pipeline is connected to an inlet end of the chromatographic analyzer; the exhaust
valve is connected between the twelfth pipeline and the fourteenth pipeline. The first pipeline,
the second pipeline and the third pipeline are connected to each other through the first gas
valve; the fourth pipeline, the fifth pipeline and the ninth pipeline are connected to each other
through the second gas valve; the sixth pipeline, the seventh pipeline and a first end of the
eleventh pipeline are connected to each other through the third gas valve; the ninth pipeline,
the tenth pipeline and a second end of the eleventh pipeline are connected to each other
through the fourth gas valve; the seventh pipeline, the eighth pipeline and the twelfth pipeline are connected to each other through the fifth gas valve; the thirteenth pipeline, the fourteenth pipeline and the fifteenth pipeline are connected to each other through the sixth gas valve. The eighth pipeline, the fifteenth pipeline and the sixteenth pipeline are connected to each other through a three-way pipe. The gas storage device includes: a rotating power source component; a turntable mechanism, located on an output end of the rotating power source component, and including: an upper valve plate, having a bottom surface annularly provided with multiple groups of upper valve plate gas holes, where one group of the gas holes consists of two gas holes; a lower valve plate, having a bottom surface with a group of lower valve plate gas holes; a valve sheet, having a sheet surface with a group of valve sheet gas holes; a power mechanism, having an output end connected to the valve sheet, and configured to drive the valve sheet to rotate around a main shaft; and the main shaft, fixed in a middle of the upper valve plate, penetrating the lower valve plate and the valve sheet, and having a lower end connected to the rotating power source component; gas rings, evenly located on a side wall of the turntable mechanism, and each having a gas inlet and gas outlet corresponding to one group of the multiple groups of the upper valve plate gas holes; a gas intake pipe, connected to the turntable mechanism, and communicated with a first one of the lower valve plate gas holes; and an exhaust pipe, connected to the turntable mechanism, and communicated with a second one of the lower valve plate gas holes, where a position of the upper valve plate gas hole, a position of the lower valve plate gas hole and a position of the
_0 valve sheet gas hole correspond to each other. In some embodiments, the gas storage device further includes: a base; an assembly frame,
located on a surface of the base and having an upper surface supporting the upper valve plate,
the lower valve plate and the valve sheet; a case body, hinged to the base; and a power
mechanism connector, assembled to a lower surface of the assembly frame, and having a
bottom for fixing the power mechanism.
In some embodiments, the two gas source components are a dry air source component
and a pure nitrogen source component.
In embodiments of a second aspect of the present disclosure, a gas storage device is
provided. The gas storage device is applied in the detection system for the mark gas of coal
spontaneous ignition as described in the first aspect. The gas storage device includes: a motor; a turntable mechanism, located on an output end of the motor, and including: an upper valve plate, having a bottom surface annularly provided with multiple groups of upper valve plate gas holes, where one group of the gas holes consists of two gas holes; a lower valve plate, having a bottom surface with a group of lower valve plate gas holes; a valve sheet, having a sheet surface with a group of valve sheet gas holes; a power mechanism, having an output end connected to the valve sheet, and configured to drive the valve sheet to rotate around a main shaft; and the main shaft, fixed in a middle of the upper valve plate, penetrating the lower valve plate and the valve sheet, and having a lower end connected to the motor; spiral shaped tubes, evenly located on a side wall of the turntable mechanism, and each having a gas inlet and a gas outlet corresponding to one group of the multiple groups of the upper valve plate gas holes; a gas intake pipe, connected to the turntable mechanism, and communicated with a first one of the lower valve plate gas holes; and an exhaust pipe, connected to the turntable mechanism, and communicated with a second one of the lower valve plate gas holes, where a position of the upper valve plate gas hole, a position of the lower valve plate gas hole and a position of the valve sheet gas hole correspond to each other.
In some embodiments, the gas storage device further includes: a base; an assembly frame, located on a surface of the base and having an upper surface supporting the upper valve plate, the lower valve plate and the valve sheet; a case body, hinged to the base; and a power mechanism connector, assembled to a lower surface of the assembly frame, and having a bottom for fixing the power mechanism.
In embodiments of a third aspect of the present disclosure, a detection method for a mark gas of coal spontaneous ignition is provided. The detection method is performed by the detection system as described in the first aspect. The two gas source components are a dry air source component and a pure nitrogen source component. The detection method includes: loading a coal sample to be detected into the oxidation furnace; adjusting an output pressure of the dry air source component and an output pressure of the pure nitrogen source component, respectively; starting the detection system for coal spontaneous ignition sign gas; setting experimental parameters by the computer; initializing the detection system and cleaning the pipelines; starting the oxidation furnace to continuously heat the coal sample in the oxidation furnace to start a simulation experiment; collecting a number of gas samples, and optionally, storing the gas samples into spiral shaped tubes of the gas storage device, according to the parameters; analyzing the gas samples by the chromatographic analyzer to obtain an analysis result; and recording analysis results of all gas samples, and closing and maintaining the detection system when the experiment is completed.
In some embodiments, the parameters include a gas flow, a collecting period, a
maximum temperature, a flow stabilization time, a preheating time, a chromatographic
sampling time, a gas storing time, a gas withdrawing time, a pipeline cleaning time, and a
spiral shaped tube cleaning time.
In some embodiments, initializing the detection system and cleaning the pipelines
includes: controlling a turntable mechanism of the gas storage device to reset by the computer;
and introducing pure nitrogen into the pipelines of the detection system to clean the pipelines.
In some embodiments, the pipelines are cleaned by the pure nitrogen in at least one of
cleaning routes of:
(i) the second pipeline-the third pipeline-the fourth pipeline-the ninth pipeline-the
tenth pipeline-the thirteenth pipeline-the fourteenth pipeline-the exhaust valve;
(ii) the second pipeline-the third pipeline-the fourth pipeline-the ninth pipeline-the
tenth pipeline-the thirteenth pipeline-the fifteenth pipeline-the sixteenth pipeline-the
chromatographic analyzer;
(iii) the second pipeline-the third pipeline-the fourth pipeline-the fifth pipeline-the
sixth pipeline - the eleventh pipeline - the tenth pipeline - the thirteenth pipeline - the
fourteenth pipeline-the exhaust valve;
(iv) the second pipeline-the third pipeline-the fourth pipeline-the fifth pipeline-the
sixth pipeline-the seventh pipeline-the twelfth pipeline-the exhaust valve; and
(v) the second pipeline-the third pipeline-the fourth pipeline-the fifth pipeline-the
sixth pipeline - the seventh pipeline - the eighth pipeline - the sixteenth pipeline - the
chromatographic analyzer.
In some embodiments, the cleaning routes are selected in a manner that all the pipelines
are cleaned.
In some embodiments, starting the oxidation furnace to continuously heat the coal sample in the oxidation furnace to start the simulation experiment includes: starting a heating procedure by the computer to start a coal spontaneous ignition simulation experiment; starting the dry air source component to introduce dry air into the pipelines; and heating the coal sample by a heater located in the oxidation furnace when a gas flow reaches a preset value. Before the gas flow reaches the preset value, the dry air flows in a path of the first pipeline the third pipeline-the fourth pipeline-the fifth pipeline-the sixth pipeline-the seventh pipeline-the twelfth pipeline-the exhaust valve.
In some embodiments, the preset value is in a range of 100 to 200 ml/min.
In some embodiments, the detection method includes: when a gas generating rate of the oxidation furnace is lower than or equal to a gas chromatographic analysis rate, directly introducing the gas sample produced by the oxidation furnace into the chromatographic analyzer for analysis.
In some embodiments, storing the gas sample into the spiral shaped tube includes: when a gas generating rate of the oxidation furnace is greater than a gas chromatographic analysis rate, storing the gas sample produced during an analysis period of the chromatographic analyzer in the spiral shaped tube of the gas storage device.
In some embodiments, the detection method further includes: when the coal sample reaches a preset maximum temperature, stopping the heater from heating the coal sample, switching the dry air source component to the pure nitrogen source component, and discharging the gas in the pipelines in a gas flow path of the second pipeline-the third pipeline-the fourth pipeline-the fifth pipeline-the sixth pipeline-the seventh pipeline the twelfth pipeline-the exhaust valve.
In some embodiments, the preset maximum temperature is in a range of 350 °C to 400 °C.
In some embodiments, analyzing the gas samples by the chromatographic analyzer to obtain analysis result includes: transporting the gas samples stored in the spiral shaped tubes to the chromatographic analyzer in a sequence identical to a sequence for storing the gas samples; obtaining the analysis results by analyzing the gas samples by the chromatographic analyzer in sequence; and recording and labeling the analysis results corresponding to the gas samples.
In some embodiments, closing and maintaining the detection system includes: closing
the gas valves of the oxidation furnace, the chromatographic analyzer, and the dry air source
component; cleaning the chromatographic analyzer by injecting hydrogen for 0.5 h, cleaning
the detection system by injecting pure nitrogen for 3 h and closing the gas valve of the pure
nitrogen gas source component; and removing a coal sample residual in the detection system
after a temperature of the coal sample residual is reduced to a room temperature.
Advantages according to the present disclosure are as follows.
In the present disclosure, by providing the gas storage device, the gas samples generated
in the analysis period of the chromatographic analyzer may be temporarily stored, especially
during a rapid heating stage of the coal sample. After one gas sample is analyzed by the
chromatographic analyzer, one of the stored samples may be taken out to be analyzed
according to requirements, thereby increasing the number of sample collections and analyses
in a single experiment period. The problems in the existing coal spontaneous ignition
experiment, which usually occur in a later half of the experiment, such as inadequate sample
amount for analysis, insufficient and incomplete analysis results, and a large deviation
between the analysis result and an actual output in temperature and time, may be solved by
the technical solutions of the present disclosure.
A process of gas sample collection, storage, release and analysis may be programed,
which is convenient for control and management through the computer system, improves
accuracy and stability of gas sample collection, and reduces labor costs.
A design of pipeline cleaning is provided, which may purge and empty output and input
pipelines and the gas rings, and avoid an influence of residual gas components in the pipelines
on a next gas sample to be analyzed or an experiment of a next coal sample, thereby
improving an accuracy of the analysis results.
FIG. 1 is a schematic diagram showing devices and pipelines of a detection system for a
mark gas of coal spontaneous ignition according to an embodiment of the present disclosure.
FIG. 2 is a schematic diagram showing a gas storage device according to an embodiment
of the present disclosure.
FIG. 3 is a schematic diagram showing interior of a gas storage device according to an
embodiment of the present disclosure.
FIG. 4 is an explosive diagram showing a turntable mechanism of a gas storage device
according to an embodiment of the present disclosure.
Reference numerals:
gas source component: 101; flow controller: 102; oxidation furnace: 103; gas storage
device: 104; gas rings: 1041; turntable mechanism: 1042; rotating power source component:
1043: gas intake pipe: 1044: exhaust pipe 1045; base: 1046; assembly frame: 1047; case body:
1048; power mechanism connector: 1049; chromatographic analyzer: 105; exhaust valve: 106;
upper valve plate: 421; lower valve plate: 422; valve sheet: 423; gas hole: 424; power
mechanism: 425; main shaft: 426.
The present disclosure will now be described in detail in connection with the drawings
below.
Example 1 As shown in FIG. 1, a detection system for a mark gas of coal spontaneous ignition
includes gas source components 101, a flow controller 102, an oxidation furnace 103, a gas
storage device 104, a chromatographic analyzer 105, an exhaust valve 106, pipelines, gas
valves and a computer. There are two gas source components 101 connected to the flow
controller 102 through the pipeline and the gas valve, respectively. The flow controller 102,
the oxidation furnace 103 and the gas storage device 104 are connected to each other through
the pipelines and the gas valves. The oxidation furnace 103 is connected to the
chromatographic analyzer 105 and the exhaust valve 106 through the pipelines and the gas
valves. The gas storage device 104 is connected to the chromatographic analyzer 105 and the
exhaust valve 106 through the pipelines and the gas valves. A computer is electrically
connected to the gas source components 101, the flow controller 102, the oxidation furnace
103, the gas storage device 104, the chromatographic analyzer 105, the exhaust valve 106 and the gas valves.
The pipelines include a first pipeline, a second pipeline, a third pipeline, a fourth pipeline,
a fifth pipeline, a sixth pipeline, a seventh pipeline, an eighth pipeline, a ninth pipeline, a
tenth pipeline, an eleventh pipeline, a twelfth pipeline, a thirteenth pipeline, a fourteenth
pipeline, a fifteenth pipeline and a sixteenth pipeline. The gas valves are electronically
controlled three-way valves. The first pipeline is connected to one of the two gas source
components 101 and the second pipeline is connected to the other one of the two gas source
components 101. The third pipeline is connected to one end of the flow controller 102, and
the fourth pipeline is connected to the other end of the flow controller 102. The fifth pipeline
and the sixth pipeline are connected to an input end and an output end of the oxidation
furnace 103, respectively. The tenth pipeline and the thirteenth pipeline are connected to an
input end and an output end of the gas storage device 104, respectively. The sixteenth pipeline
is connected to an inlet end of the chromatographic analyzer 105. The exhaust valve 106 is
connected between the twelfth pipeline and the fourteenth pipeline. The first pipeline, the
second pipeline and the third pipeline are connected to each other through a first gas valve.
The fourth pipeline, the fifth pipeline and the ninth pipeline are connected to each other
through a second gas valve. The sixth pipeline, the seventh pipeline and a first end of the
eleventh pipeline are connected to each other through a third gas valve. The ninth pipeline, the
tenth pipeline and a second end of the eleventh pipeline are connected to each other through a
fourth gas valve. The seventh pipeline, the eighth pipeline and the twelfth pipeline are
connected to each other through a fifth gas valve. The thirteenth pipeline, the fourteenth
pipeline and the fifteenth pipeline are connected to each other through a sixth gas valve. The
eighth pipeline, the fifteenth pipeline and the sixteenth pipeline are connected to each other
through a three-way pipe.
Example 2: A gas storage device for a detection system for a mark gas of coal spontaneous ignition
includes a plurality of gas rings 1041, a turntable mechanism 1042, a rotating power source
component 1043, a gas intake pipe 1044 and an exhaust pipe 1045. A plurality of gas rings
1041 are evenly located on a side wall of the turntable mechanism 1042. The turntable
mechanism 1042 is assembled to an output end of the rotating power source component 1043.
The gas intake pipe 1044 and the exhaust pipe 1045 are connected to the turntable mechanism
1042.
The turntable mechanism 1042 includes an upper valve plate 421, a lower valve plate
422, a valve sheet 423, gas holes 424, a power mechanism 425 and a main shaft 426. One
group of the gas holes consists of two gas holes. The upper valve plate 421 has a bottom
surface annularly provided with a plurality of groups of upper valve plate gas holes. Each gas
ring 1041 has a gas inlet and a gas outlet corresponding to the respective group of upper valve
plate gas holes. The lower valve plate 422 has a bottom surface with a group of lower valve
plate gas holes. The valve sheet 423 has a sheet surface with a group of valve sheet gas holes.
A position of the group of the upper valve plate gas holes, a position of the group of the lower
valve plate gas holes and a position of the valve sheet gas holes are matched to each other to
allow a gas to flow. The main shaft 426 is fixed in a center of the upper valve plate 421,
passes through the lower valve plate 422 and the valve sheet 423, and has a lower end
connected to the rotating power source component 1043. The power mechanism 425 has an
output end connected to the valve sheet 423 and is configured to drive the valve sheet 423 to
rotate around the main shaft 426. One gas hole of the lower valve plate 422 is communicated
with the gas intake pipe 1044 and the other gas hole of the lower valve plate 422 is
communicated with the exhaust pipe 1045.
The gas storage device 104 further includes a base 1046, an assembly frame 1047, a
case body 1048 and a power mechanism connector 1049. The assembly frame 1047 is located
on a surface of the base 1046. The case body 1048 is hinged to the base 1046. The power
mechanism connector 1049 is assembled to the assembly frame 1047 at a bottom of the
assembly frame 1047. The power mechanism 425 is installed or fixed at a bottom of the
power mechanism connector 1049. The upper valve plate 421, the lower valve plate 422 and
the valve sheet 423 are located above or on an upper surface of the assembly frame 1047.
Example 3:
A detection method using the detection system in Example 1 and the gas storage device
in example 2 is provided. The two gas source components 101 are a dry air source component
and a pure nitrogen source component.
The detection method includes operations as follows.
In operation (1), a coal sample to be detected is loaded into the oxidation furnace 103.
In operation (2), an output pressure of the dry air source component and an output pressure of the pure nitrogen source component are adjusted.
In operation (3), the detection system for the mark gas of coal spontaneous ignition is turned on by contacting a power.
In operation (4), experimental parameters are set by a computer.
In operation (5), the detection system is initialized, and pipelines are cleaned.
In operation (6), the oxidation furnace 103 is started to continuously heat the coal sample in the oxidation furnace 103.
In operation (7), a gas sample is collected according to the parameters. Optionally, the gas sample is collected and stored into a gas ring 1041 according to the parameters.
In operation (8), the gas sample, optionally in the gas ring 1041, is analyzed by a chromatographic analyzer 105 to obtain analysis results.
In operation (9), the analysis results of all gas samples are recorded, and the detection system is closed and maintained when the experiment is completed.
In operation (1), the coal sample has a particle size less than 0.15 mm. Ig of the coal sample to be detected is weighted by an analytical balance, and is loaded into a sample tube of the oxidation furnace 103. The sample tube loading with the coal sample is placed into a reaction chamber, and a sealing cap is tightened.
In operation (2), the output pressure of the dry air source component and the output pressure of the pure nitrogen source component are independently adjusted to a range of 0.4 to 0.5 MPa.
In operation (3), the gas source components 101, the flow controller 102, the oxidation furnace 103, the gas storage device 104, the chromatographic analyzer 105, the exhaust valve 106, the gas valves and the computer are powered on by an external power supply, such that the detection system is on standby.
In operation (4), the parameters include a gas flow, a collecting period, a maximum temperature, a flow stabilization time, a preheating time, a chromatographic sampling time, a gas storing time, a gas withdrawing time, a pipeline cleaning time, and a gas ring cleaning time.
The gas flow and the maximum temperature may be set according to a national standard.
For example, the gas flow is 100 ml/min, and the maximum temperature is 350 °C.
Alternatively, the gas flow and the maximum temperature may be set in practice. In order to
keep the safety of the system, the maximum gas flow is no higher than 200 ml/min, and the
maximum temperature is no higher than 400 °C.
The other parameters may be set as follows. The collecting period is 20 s, the flow
stabilization time is 10 s, the preheating time is 10 s, the chromatography sampling time is
180 s, the gas storage time is 30 s, the gas withdrawing time is 13 s, the pipeline cleaning time
is 200 s, and the gas ring cleaning time is greater than or equal to 30 s.
In operation (5), a turntable mechanism 1042 of the gas storage device 104 is controlled
to be reset by the computer, and pure nitrogen is introduced into the pipelines of the detection
system to clean the pipelines by at least one of cleaning routes of:
(i) the second pipeline-the third pipeline-the fourth pipeline-the ninth pipeline-the
tenth pipeline-the thirteenth pipeline-the fourteenth pipeline-the exhaust valve 106;
(ii) the second pipeline-the third pipeline-the fourth pipeline-the ninth pipeline-the
tenth pipeline-the thirteenth pipeline-the fifteenth pipeline-the sixteenth pipeline-the
chromatographic analyzer 105;
(iii) the second pipeline-the third pipeline-the fourth pipeline-the fifth pipeline-the
sixth pipeline-the eleventh pipeline-the tenth pipeline-the thirteenth pipeline-the
fourteenth pipeline-the exhaust valve 106;
(iv) the second pipeline-the third pipeline-the fourth pipeline-the fifth pipeline-the
sixth pipeline-the seventh pipeline-the twelfth pipeline-the exhaust valve 106; and
(v) the second pipeline-the third pipeline-the fourth pipeline-the fifth pipeline-the
sixth pipeline - the seventh pipeline - the eighth pipeline - the sixteenth pipeline - the
chromatographic analyzer 105.
The routes can be selected and the selected routes can be cleaned in any sequence as long
as all the pipelines, i.e., the second pipeline to sixteenth pipeline, is cleaned.
In operation (6), a heating procedure is started by the computer to start the coal
spontaneous ignition simulation experiment. The dry air source component is started to
introduce dry air into the pipelines, and the coal sample is heated by a heater in the oxidation
furnace 103 when a gas flow reaches a preset value. Before the gas flow reaches the preset
value, the dry gas flows in a path of the first pipeline--the third pipeline--the fourth
pipeline--the fifth pipeline--the sixth pipeline--the seventh pipeline--the twelfth
pipeline--the exhaust valve 106.
In operation (7), in an initial stage of the experiment, the temperature of the coal sample
is increased slowly (that is, a heating rate of the coal sample is low), and the gas is generated
from the oxidation furnace 103 slowly (that is, a gas output rate of the oxidation furnace 103
is low). At this stage, the gas output rate of the oxidation furnace 103 is lower than a gas
chromatographic analysis rate, and the gas sample produced by the oxidation furnace 103 may
be directly introduced into the chromatographic analyzer 105 for analysis.
In a middle and late stage of the experiment, the heating rate of the coal body is
increased, and the gas output rate of the oxidation furnace 103 is also increased. At this stage,
the gas sample produced during the analysis period of the chromatographic analyzer 105 is
stored in the gas rings 1041 by the gas storage device 104. On a display interface of the
computer, displayed is a turntable mechanism image corresponding to a label of the gas ring
1041 on the turntable mechanism 1042 of the gas storage device 104. The gas sampling may
be set in any of the following manners.
In a first example, the system may automatically select sampling points in an interval
along a curve which may be an existing coal sample temperature rise curve imported by the
system, and the gas samples are stored in the corresponding numbered gas rings 1041 in a
sequence of sampling times of the gas samples.
In a second example, temperatures of the coal sample are preset, and the gas sampling is
performed when the coal sample is heated to one of preset temperatures. The gas sample
obtained is stored in a corresponding numbered gas ring 1041 in a sequence of a sampling
time of the gas sample.
In a third example, a time of gas sampling, and a gas ring for storing an obtained gas sample are selected and controlled by an operator each time. During this procedure, the computer can determine whether the selected gas ring is a current gas ring connected to the gas pipelines in the current gas storage device. If it is determined that the selected gas ring is the current gas ring, the gas sample is stored in the gas ring. If it is determined that the selected gas ring is not the current gas ring, the operator is prompted to adjust the turntable mechanism in a suitable position.
In an embodiment, the gas storing time lasts for 30 s as set in operation (4).
After storage, the gas in the pipelines is discharged in a gas flow path of the first pipeline
-the third pipeline-the fourth pipeline-the fifth pipeline-the sixth pipeline-the seventh
pipeline-the twelfth pipeline-the exhaust valve 106.
When the coal sample reaches the maximum temperature, the experiment is completed,
the heater is stopped from heating the coal sample, and the gas source is switched to the pure
nitrogen source. The pure nitrogen source component is opened, and the gas in the pipelines is
discharged in a gas flow path of the second pipeline-the third pipeline-the fourth pipeline
-the fifth pipeline-the sixth pipeline-the seventh pipeline-the twelfth pipeline-the
exhaust valve 106.
When an emergency occurs during the experiment, the detection system may be stopped
by the computer. The heater is stopped from heating the coal sample, the pure nitrogen source
component is opened, and the gas in the pipelines is discharged in a gas flow path of the
second pipeline- the third pipeline- the fourth pipeline- the fifth pipeline- the sixth
pipeline-the seventh pipeline-the twelfth pipeline-the exhaust valve 106.
In an embodiment, according to the existing coal sample temperature rise curve, the
sampling temperatures may be set in an equal interval of 20°C. Alternatively, the sampling
temperatures may be 40°C, 60°C, 80°C, 100°C, 120°C, 135°C, 150°C, 170°C, 185°C, 200°C,
220°C, 250°C, 275°C, 300°C, 320°C, 335°C and 350, which may be adjusted according to
actual situations.
In operation (8), the gas withdrawing time lasts for 13s as set in operation (4). After
sampling, the gas in the pipelines is discharged in a gas flow path of the second pipeline-the
third pipeline-the fourth pipeline-the fifth pipeline-the sixth pipeline-the seventh pipeline-the twelfth pipeline-the exhaust valve 106.
The gas samples are transported to the chromatographic analyzer 105 for analysis in a
sequence identical to the sequence of storing the gas samples, and the analysis results are
obtained by analyzing the gas samples by the chromatographic analyzer 105, and the analysis
results are recorded and labeled corresponding to the gas samples.
In operation (9), when the experiment is completed, the gas valves of the oxidation
furnace 103, the chromatographic analyzer 105 and the dry air source component are closed.
Hydrogen is injected into the chromatographic analyzer 105 from an external hydrogen
generator for 0.5 h, and then the hydrogen generator is closed. The hydrogen is injected for
cooling and emptying the chromatographic analyzer 105, which is a processing procedure
before the chromatographic analyzer 105 is closed. At the same time, pure nitrogen is injected
for 3 hours, and then the gas valve of the pure nitrogen gas source component is closed.
Residual coal samples in the detection system are cleaned after a temperature of the coal is
reduced to a room temperature.
In the description of the present disclosure, it should be understood that, unless specified
or limited otherwise, the terms "assembled," "connected," and "communicated" and
variations thereof are used broadly and encompass such as mechanical or electrical assemblies,
connections and communications, also can be inner assemblies, connections and
communications of two components, and further can be direct and indirect assemblies,
connections and communications, which can be understood by those skilled in the art
according to the detail embodiment of the present disclosure.
In the present disclosure, unless specified or limited otherwise, a structure in which a
first feature is "on" or "below" a second feature may include an embodiment in which the first
feature is in direct contact with the second feature, and may also include an embodiment in
which the first feature and the second feature are not in direct contact with each other, but are
contacted via an additional feature formed therebetween. Furthermore, a first feature "on,"
"above," or "on top of' a second feature may include an embodiment in which the first feature
is right or obliquely "on," "above," or "on top of' the second feature, or just means that the
first feature is at a height higher than that of the second feature; while a first feature "below,"
"under," or "on bottom of' a second feature may include an embodiment in which the first feature is right or obliquely "below," "under," or "on bottom of' the second feature, or just means that the first feature is at a height lower than that of the second feature. Reference throughout this specification to "an embodiment," "some embodiments," "one embodiment", "another example," "an example," "a specific example," or "some examples," means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the phrases such as "in some embodiments," "in one embodiment", "in an embodiment", "in another example,' 'in an example,' ''in a specific example," or "in some examples," in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. Although explanatory embodiments have been shown and described, it would be appreciated by those skilled in the art that the above embodiments cannot be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the embodiments without departing from the scope of the present disclosure. The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that such prior art forms part of the common _0 general knowledge. It will be understood that the terms "comprise" and "include" and any of their derivatives (e.g. comprises, comprising, includes, including) as used in this specification, and the claims that follow, is to be taken to be inclusive of features to which the term refers, and is not meant to exclude the presence of any additional features unless otherwise stated or implied. In some cases, a single embodiment may, for succinctness and/or to assist in understanding the scope of the disclosure, combine multiple features. It is to be understood that in such a case, these multiple features may be provided separately (in separate embodiments), or in any other suitable combination. Alternatively, where separate features are described in separate embodiments, these separate features may be combined into a single embodiment unless otherwise stated or implied. This also applies to the claims which can be recombined in any combination. That is a claim may be amended to include a feature defined in any other claim. Further a phrase referring to "at least one of' a list of items refers to any combination of those items, including single members. As an example, "at least one of: a, b, or c" is intended to cover: a, b, c, a-b, a-c, b-c, and a-b-c.
Claims (16)
1. A detection system for a mark gas of coal spontaneous ignition, comprising:
pipelines, comprising a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a
fifth pipeline, a sixth pipeline, a seventh pipeline, an eighth pipeline, a ninth pipeline, a tenth
pipeline, an eleventh pipeline, a twelfth pipeline, a thirteenth pipeline, a fourteenth pipeline, a
fifteenth pipeline and a sixteenth pipeline;
gas valves, being electronically controlled three-way valves, and comprising a first gas valve,
a second gas valve, a third gas valve, a fourth gas valve, a fifth gas valve and a sixth gas valve;
a flow controller;
two gas source components, connected to the flow controller;
a chromatographic analyzer;
an exhaust valve;
an oxidation furnace, connected to the chromatographic analyzer and the exhaust valve;
a gas storage device, connected to the chromatographic analyzer and the exhaust valve; and
a computer, electrically connected to the gas source components, the flow controller, the
oxidation furnace, the gas storage device, the chromatographic analyzer, the exhaust valve and the
gas valves;
wherein the flow controller, the oxidation furnace and the gas storage device are connected to
each other;
wherein the first pipeline and the second pipeline are connected to the two gas source
components, respectively; the flow controller is connected between the third pipeline and the
fourth pipeline; the fifth pipeline and the sixth pipeline are connected to an input end and an output
end of the oxidation furnace, respectively; the tenth pipeline and the thirteenth pipeline are
connected to an input end and an output end of the gas storage device, respectively; the sixteenth
pipeline is connected to an inlet end of the chromatographic analyzer; the exhaust valve is
connected between the twelfth pipeline and the fourteenth pipeline;
the first pipeline, the second pipeline and the third pipeline are connected to each other
through the first gas valve; the fourth pipeline, the fifth pipeline and the ninth pipeline are connected to each other through the second gas valve; the sixth pipeline, the seventh pipeline and a first end of the eleventh pipeline are connected to each other through the third gas valve; the ninth pipeline, the tenth pipeline and a second end of the eleventh pipeline are connected to each other through the fourth gas valve; the seventh pipeline, the eighth pipeline and the twelfth pipeline are connected to each other through the fifth gas valve; the thirteenth pipeline, the fourteenth pipeline and the fifteenth pipeline are connected to each other through the sixth gas valve; and the eighth pipeline, the fifteenth pipeline and the sixteenth pipeline are connected to each other through a three-way pipe; wherein the gas storage device comprises: a motor; a turntable mechanism, located on an output end of the motor, and comprising: an upper valve plate, having a bottom surface annularly provided with multiple groups of upper valve plate gas holes, wherein one group of the gas holes consists of two gas holes; a lower valve plate, having a bottom surface with a group of lower valve plate gas holes; a valve sheet, having a sheet surface with a group of valve sheet gas holes; a power mechanism, having an output end connected to the valve sheet, and configured to drive the valve sheet to rotate around a main shaft; and the main shaft, fixed in a middle of the upper valve plate, penetrating the lower valve plate and the valve sheet, and having a lower end connected to the motor; spiral shaped tubes, evenly located on a side wall of the turntable mechanism, and each having a gas inlet and gas outlet corresponding to one group of the multiple groups of the upper valve plate gas holes; a gas intake pipe, connected to the turntable mechanism, and communicated with a first one of the lower valve plate gas holes; and an exhaust pipe, connected to the turntable mechanism, and communicated with a second one of the lower valve plate gas holes, wherein a position of the upper valve plate gas hole, a position of the lower valve plate gas hole and a position of the valve sheet gas hole correspond to each other.
2. The detection system according to claim 1, wherein the gas storage device further comprises: a base; an assembly frame, located on a surface of the base and having an upper surface supporting the upper valve plate, the lower valve plate and the valve sheet; a case body, hinged to the base; and a power mechanism connector, assembled to a lower surface of the assembly frame, and having a bottom for fixing the power mechanism.
3. The detection system according to claim 1 or 2, wherein the two gas source components
are a dry air source component and a pure nitrogen source component.
4. A detection method for a mark gas of coal spontaneous ignition, performed by a detection
system according to claim 1, wherein the two gas source components are a dry air source
component and a pure nitrogen source component;
wherein the detection method comprises:
loading a coal sample to be detected into the oxidation furnace;
adjusting an output pressure of the dry air source component and an output pressure of the
pure nitrogen source component, respectively;
starting the detection system for coal spontaneous ignition sign gas;
setting experimental parameters by the computer;
initializing the detection system and cleaning the pipelines;
starting the oxidation furnace to continuously heat the coal sample in the oxidation furnace to
start a simulation experiment;
collecting a number of gas samples, and optionally, storing the gas samples into spiral shaped
tubes of the gas storage device, according to the parameters;
analyzing the gas samples by the chromatographic analyzer to obtain an analysis result; and
recording analysis results of all gas samples, and closing and maintaining the detection
system when the experiment is completed.
5. The detection method according to claim 4, wherein the parameters comprise a gas flow, a
collecting period, a maximum temperature, a flow stabilization time, a preheating time, a
chromatographic sampling time, a gas storing time, a gas withdrawing time, a pipeline cleaning time, and a spiral shaped tube cleaning time.
6. The detection method according to claim 4, wherein initializing the detection system and cleaning the pipelines comprises:
controlling a turntable mechanism of the gas storage device to reset by the computer; and
introducing pure nitrogen into the pipelines of the detection system to clean the pipelines.
7. The detection method according to claim 6, wherein the pipelines are cleaned by the pure nitrogen in at least one of cleaning routes of:
(i) the second pipeline-the third pipeline-the fourth pipeline-the ninth pipeline-the tenth pipeline-the thirteenth pipeline-the fourteenth pipeline-the exhaust valve;
(ii) the second pipeline-the third pipeline-the fourth pipeline-the ninth pipeline-the tenth pipeline - the thirteenth pipeline - the fifteenth pipeline - the sixteenth pipeline - the
chromatographic analyzer;
(iii) the second pipeline-the third pipeline-the fourth pipeline-the fifth pipeline-the sixth pipeline-the eleventh pipeline-the tenth pipeline-the thirteenth pipeline-the fourteenth pipeline-the exhaust valve;
(iv) the second pipeline-the third pipeline-the fourth pipeline-the fifth pipeline-the sixth pipeline-the seventh pipeline-the twelfth pipeline-the exhaust valve; and
(v) the second pipeline-the third pipeline-the fourth pipeline-the fifth pipeline-the sixth pipeline-the seventh pipeline-the eighth pipeline-the sixteenth pipeline-the chromatographic analyzer.
8. The detection method according to claim 7, wherein the cleaning routes are selected in a manner that all the pipelines are cleaned.
9. The detection method according to claim 4, wherein starting the oxidation furnace to continuously heat the coal sample in the oxidation furnace to start the simulation experiment comprises:
starting a heating procedure by the computer to start a coal spontaneous ignition simulation experiment;
starting the dry air source component to introduce dry air into the pipelines; and
heating the coal sample by a heater located in the oxidation furnace when a gas flow reaches a preset value, wherein before the gas flow reaches the preset value, the dry air flows in a path of the first pipeline-the third pipeline-the fourth pipeline-the fifth pipeline-the sixth pipeline-the seventh pipeline-the twelfth pipeline-the exhaust valve.
10. The detection method according to claim 9, wherein the preset value is in a range of 100
to 200 ml/min.
11. The detection method according to claim 4, comprising:
when a gas generating rate of the oxidation furnace is lower than or equal to a gas
chromatographic analysis rate, directly introducing the gas samples produced by the oxidation
furnace into the chromatographic analyzer for analysis.
12. The detection method according to claim 4, wherein storing the gas samples into the spiral
shaped tube comprises:
when a gas generating rate of the oxidation furnace is greater than a gas chromatographic
analysis rate, storing the gas samples produced during an analysis period of the chromatographic
analyzer in the spiral shaped tube of the gas storage device.
13. The detection method according to claim 9, further comprising:
when the coal sample reaches a preset maximum temperature, stopping the heater from
heating the coal sample, switching the dry air source component to the pure nitrogen source
component, and discharging the gas in the pipelines in a gas flow path of the second pipeline-the
third pipeline-the fourth pipeline-the fifth pipeline-the sixth pipeline-the seventh pipeline
the twelfth pipeline-the exhaust valve.
14. The detection method according to claim 12, wherein the preset maximum temperature is
in a range of 350 °C to 400 °C.
15. The detection method according to claim 4, wherein analyzing the gas samples by the
chromatographic analyzer to obtain analysis result comprises:
transporting the gas samples stored in the spiral shaped tubes to the chromatographic analyzer
in a sequence identical to a sequence for storing the gas samples;
obtaining the analysis results by analyzing the gas samples by the chromatographic analyzer
in sequence; and
recording and labeling the analysis results corresponding to the gas samples.
16. The detection method according to claim 4, wherein closing and maintaining the detection system comprises: closing the gas valves of the oxidation furnace, the chromatographic analyzer, and the dry air source component; cleaning the chromatographic analyzer by injecting hydrogen for 0.5 h, cleaning the detection system by injecting pure nitrogen for 3 h and closing the gas valve of the pure nitrogen gas source component; and removing a coal sample residual in the detection system after a temperature of the coal sample residual is reduced to a room temperature.
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| CN202111455082.5A CN114200043B (en) | 2021-12-01 | 2021-12-01 | System and method for detecting coal natural ignition sign gas and gas storage device thereof |
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