CN108387704B - Decomposing and burning device and method for liquid nitrogen frozen natural gas hydrate sample - Google Patents
Decomposing and burning device and method for liquid nitrogen frozen natural gas hydrate sample Download PDFInfo
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- CN108387704B CN108387704B CN201810074858.0A CN201810074858A CN108387704B CN 108387704 B CN108387704 B CN 108387704B CN 201810074858 A CN201810074858 A CN 201810074858A CN 108387704 B CN108387704 B CN 108387704B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 153
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 77
- 239000007788 liquid Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 21
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 111
- 230000001105 regulatory effect Effects 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 29
- 239000007789 gas Substances 0.000 claims description 80
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 32
- 239000001301 oxygen Substances 0.000 claims description 32
- 229910052760 oxygen Inorganic materials 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 238000000354 decomposition reaction Methods 0.000 claims description 20
- 238000005070 sampling Methods 0.000 claims description 8
- 238000009835 boiling Methods 0.000 claims description 7
- 238000009841 combustion method Methods 0.000 claims description 5
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 abstract description 2
- 108010066057 cabin-1 Proteins 0.000 description 12
- 108010066114 cabin-2 Proteins 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- -1 Natural gas hydrates Chemical class 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels; Explosives
- G01N33/225—Gaseous fuels, e.g. natural gas
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Abstract
The invention provides a decomposing and burning device and a decomposing and burning method for a liquid nitrogen frozen natural gas hydrate sample, wherein the decomposing and burning device comprises a sample cabin, a balance cabin, an air outlet device, a regulating valve and a methane detector, the sample cabin is communicated with the balance cabin, and the height of the balance cabin is larger than that of the sample cabin; one end of the air outlet device is communicated with the sample cabin, and the other end of the air outlet device is provided with an air outlet nozzle; the regulating valve is arranged on the air outlet device and is positioned below the air outlet nozzle; one end of the methane detector extends into the sample cabin and is communicated with the sample cabin, and a sealing device is arranged between the methane detector and the sample cabin. The invention can separate nitrogen and natural gas hydrate samples stored in the frozen natural gas hydrate samples mixed with liquid nitrogen, and has simple structure, simple and convenient operation and reliable performance.
Description
Technical Field
The invention relates to the technical field of decomposition and combustion of liquid nitrogen frozen natural gas hydrate samples, in particular to a device and a method for decomposing and combusting liquid nitrogen frozen natural gas hydrate samples.
Background
Natural gas hydrates, also known as "combustible ice", are widely distributed in deep sea sediments or permanent frozen soil in land areas, and are ice-like crystalline substances formed by natural gas and water under high pressure and low temperature conditions. It is also called "combustible ice" because it looks like ice and burns when exposed to fire. The method has high resource density, wide global distribution and extremely high resource value, thereby becoming a long-term research hotspot in the oil and gas industry. Since natural gas hydrate is extremely decomposed at normal temperature and pressure, a natural gas hydrate sample is stored in a laboratory and is required to be stored in liquid nitrogen by freezing (the liquid nitrogen temperature is-196 ℃ C. Under normal pressure).
The purity of the natural gas hydrate sample is an important index in research, and the determination of the purity of the natural gas hydrate is carried out by taking the natural gas hydrate out of liquid nitrogen, placing the natural gas hydrate in a container for heating decomposition, and collecting gas components released by the heating decomposition for subsequent laboratory determination; or the gas released by the split explanation is ignited, and the purity of the natural gas hydrate sample is primarily judged according to the intensity of combustion.
Therefore, when the natural gas hydrate frozen and preserved in the liquid nitrogen is taken out, a certain amount of liquid nitrogen is carried, and a large amount of nitrogen is released by volatilization of the liquid nitrogen, and the nitrogen is mixed into the gas released by decomposition of the natural gas hydrate, so that the subsequent research work is seriously affected.
Disclosure of Invention
In order to overcome the technical problems, the invention provides a decomposing and burning device and a method for a liquid nitrogen frozen natural gas hydrate sample, which can separate nitrogen and natural gas hydrate samples stored in the liquid nitrogen mixed frozen natural gas hydrate sample.
In order to achieve the purpose, the decomposing and burning device for the liquid nitrogen frozen natural gas hydrate sample comprises a sample cabin, a balance cabin, an air outlet device, a regulating valve and a methane detector, wherein the sample cabin is communicated with the balance cabin, and the height of the balance cabin is larger than that of the sample cabin; one end of the air outlet device is communicated with the sample cabin, and the other end of the air outlet device is provided with an air outlet nozzle; the regulating valve is arranged on the air outlet device and is positioned below the air outlet nozzle; one end of the methane detector extends into the sample cabin and is communicated with the sample cabin, and a sealing device is arranged between the methane detector and the sample cabin.
Preferably, a sealing cover is arranged between the methane detector and the sample cabin, and the sealing cover is arranged around one end of the methane detector, which extends into the sample cabin, in a circle.
Preferably, the decomposing and burning device for the liquid nitrogen frozen natural gas hydrate sample further comprises an oxygen detector, one end of the oxygen detector extends into the sample cabin and is communicated with the sample cabin, a sealing cover is arranged between the oxygen detector and the sample cabin, and the sealing cover is arranged around one end of the oxygen detector extending into the sample cabin in a circle.
Preferably, the oxygen detector and the methane detector are respectively positioned at two sides of the air outlet device.
Preferably, the decomposing and combusting device for the liquid nitrogen frozen natural gas hydrate sample further comprises a gas flowmeter, wherein the gas flowmeter is arranged on the gas outlet device and is positioned below the regulating valve.
Preferably, the decomposing and combusting device for the liquid nitrogen frozen natural gas hydrate sample further comprises a communicating pipe, wherein the balance cabin is communicated with the sample cabin through the communicating pipe, and two ends of the communicating pipe are respectively positioned at the lower ends of the balance cabin and the sample cabin.
Preferably, the balance cabin is arranged parallel to the sample cabin, and the bottom of the balance cabin and the bottom of the sample cabin are positioned on the same horizontal line.
Preferably, the decomposing and burning device for the liquid nitrogen frozen natural gas hydrate sample further comprises a base, and the bottom of the balance cabin and the bottom of the sample cabin are fixedly arranged on the base respectively.
The decomposition and combustion method of the liquid nitrogen frozen natural gas hydrate sample comprises the following steps:
taking a natural gas hydrate sample mixed with liquid nitrogen out of a liquid nitrogen tank, placing the natural gas hydrate sample into a sample cabin, and filling water into the sample cabin, wherein the water surfaces in the sample cabin and a balance cabin are kept at the same height;
step two, covering a sealing cover on the methane detector, and opening the regulating valve; under the same temperature and pressure, the boiling point of the liquid nitrogen is lower than the decomposition temperature of the natural gas hydrate, and the liquid nitrogen attached to the natural gas hydrate sample mixed with the liquid nitrogen volatilizes into nitrogen at first, and is discharged from the air outlet nozzle after emerging from the water surface;
step three, along with the temperature rise, the natural gas hydrate sample starts to decompose and release methane gas, and a methane detector detects the increase of the methane concentration; at the moment, the regulating valve is closed, so that gas released by decomposing the natural gas hydrate sample is gathered at the top end of the sample cabin, the pressure of the sample cabin is increased along with the increase of the released gas, and water in the sample cabin enters the balance cabin, so that the water surface in the balance cabin is higher than the sample cabin, and the pressure is provided for gas discharge; when no bubble is generated in the natural gas hydrate sample, the natural gas hydrate sample is completely decomposed;
and fourthly, connecting the vacuumized atmosphere sampling bag with an air outlet nozzle, slowly opening a regulating valve, and collecting the gas at the top of the sample cabin into the atmosphere sampling bag through the air outlet nozzle.
Preferably, the decomposition and combustion method of the liquid nitrogen frozen natural gas hydrate sample further comprises the following steps:
step five, detecting the flow velocity and the total flow of the gas passing through the gas outlet nozzle by using a gas flowmeter;
step six, detecting whether oxygen is mixed by using an oxygen detector, if so, performing sealing operation;
if not, entering the next step;
and seventhly, controlling the speed of gas flowing out of the gas outlet nozzle through the regulating valve, igniting, and burning the collected gas in a controllable state.
The technical scheme that this application provided can reach following beneficial effect:
according to the invention, under the same temperature and pressure, the boiling point of liquid nitrogen is-196 ℃, and the decomposition temperature of the natural gas hydrate is-45 ℃, so that liquid nitrogen attached to the natural gas hydrate sample mixed with liquid nitrogen is volatilized into nitrogen first, and is discharged from the gas outlet nozzle. Thus, the technical problem that nitrogen is mixed into gas released by decomposing natural gas hydrate is solved; the technical effect of separating the nitrogen from the gas released by decomposing the natural gas hydrate is achieved; therefore, the purity of the gas released by decomposing the collected natural gas hydrate is ensured to be higher, the subsequent research is facilitated, and the collected gas can be combusted in a controllable state through a controllable valve (i.e. a regulating valve).
Drawings
FIG. 1 is a schematic diagram of a decomposing and burning device for liquid nitrogen frozen natural gas hydrate samples according to the present invention.
Detailed Description
Embodiments of the present invention are described below with reference to the accompanying drawings. Elements and features described in one drawing or embodiment of the invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that the illustration and description of components or processes known to those skilled in the art, which are not related to the present invention, have been omitted in the drawings and description for the sake of clarity.
The invention is further described below with reference to the accompanying drawings.
As shown in figure 1, the decomposition and combustion device for the liquid nitrogen frozen natural gas hydrate sample comprises a sample cabin 1, a balance cabin 2, an air outlet device 3, a regulating valve 4 and a methane detector 5, wherein the sample cabin is communicated with the balance cabin, when the nitrogen volatilized by the liquid nitrogen is separated from the gas released by the decomposition of the natural gas hydrate, the sample cabin needs to be filled with water, and the height of the water surface in the sample cabin 1 and the balance cabin 2 relative to the horizontal plane is equal due to the fact that the sample cabin 1 is communicated with the balance cabin 2, the boiling point of the liquid nitrogen is-196 ℃ and the decomposition temperature of the natural gas hydrate is-45 ℃ under the same temperature and pressure, so that the liquid nitrogen attached to the sample volatilizes into the nitrogen at first and then overflows out of the water surface. Since the air outlet device 3 comprises a rod-shaped structure 31 and an air outlet nozzle 32, one end of the rod-shaped structure 31 is communicated with the sample cabin 1, and the other end of the rod-shaped structure 31 is connected with the air outlet nozzle 31; therefore, nitrogen gas that has emerged out of the water surface is first discharged from the outlet nozzle 31 of the air outlet device.
Wherein the height of the balance chamber 2 is greater than that of the sample chamber 1, and when methane gas is released from the natural gas hydrate, a part of water in the sample chamber flows into the balance chamber, so that the water surface in the balance chamber is higher than that in the sample chamber, that is, the pressure in the sample chamber is greater than that in the balance chamber, thereby providing pressure for the methane gas (the main component of the natural gas is methane) released from the natural gas hydrate to be subsequently collected.
The regulating valve 4 is arranged on the air outlet device 3 and is positioned below the air outlet nozzle 32; the regulating valve is used to regulate the flow of released gas during decomposition or combustion. One end of the methane detector 5 extends into the sample cabin 1 and is communicated with the sample cabin 1, and the methane detector is arranged to detect methane, so that people can conveniently control the regulating valve. A sealing device is arranged between the methane detector 5 and the sample cabin 1. The seal cap described herein may be used to provide a seal ring, gasket or other similar means for sealing. In this embodiment, the sealing means is a sealing cap 6. Namely, a sealing cover 6 is arranged between the methane detector 5 and the sample cabin 1, and the sealing cover is arranged around one end of the methane detector, which extends into the sample cabin, in a circle. That is, when the sealing cover 6 is covered, no oxygen in the air enters the sample compartment from the gap between the methane detector and the sample compartment.
Thus, as the temperature rises, the natural gas hydrate sample begins to decompose to release methane gas, and the methane detector can immediately detect the rapid increase in methane concentration. At this time, the regulating valve 4 is closed, so that the gas released by decomposing the natural gas hydrate sample is gathered at the top end of the sample cabin 1, and along with the increase of the released gas, the pressure of the sample cabin 1 is increased, and the water in the sample cabin enters the balance cabin 2, so that the water surface in the balance cabin is higher than the sample cabin, and the pressure is provided for gas discharge.
The decomposing and burning device for the liquid nitrogen frozen natural gas hydrate sample further comprises an oxygen detector 7, one end of the oxygen detector stretches into the sample cabin and is communicated with the sample cabin 1, a sealing cover 6 is arranged between the oxygen detector 7 and the sample cabin 1, and the sealing cover is arranged around one end of the oxygen detector stretching into the sample cabin in a circle. The seal cap here, like the seal cap on the methane detector, also prevents oxygen in the air from entering the sample compartment from the gap between the oxygen detector and the sample compartment.
It should be noted that: the oxygen detector is arranged to detect whether oxygen is mixed when methane is released from the natural gas hydrate, if so, whether the sealing cover is tightly covered or not needs to be detected, and if not, the subsequent ignition can be carried out, so that the condition that explosion occurs when oxygen is mixed in the methane is avoided.
In this embodiment, the oxygen detector 7 and the methane detector 5 are respectively located at two sides of the air outlet device. The device is convenient for people to operate the oxygen detector and the methane detector to a certain extent, and especially when the oxygen detector and the methane detector work simultaneously.
The decomposing and burning device for the liquid nitrogen frozen natural gas hydrate sample further comprises a gas flowmeter 8, wherein the gas flowmeter 8 is arranged on the gas outlet device 3 and is positioned below the regulating valve 4. The gas flow meter 8 is provided to measure the volume of gas released by the decomposition of the natural gas hydrate and to indicate the flow rate and total flow of gas through the outlet nozzle 32. Thus, the operation of the regulating valve, namely the opening, closing or enlarging and reducing of the regulating valve is also convenient for people to a certain extent on the basis of the flow velocity and flow quantity.
In this embodiment, the balance chamber is connected to the sample chamber through a communication pipe 9, and the communication pipe is a simple communication device, so that the device has a simpler structure, and is convenient for people to operate the device. The two ends of the communicating pipe 9 are respectively positioned at the lower ends of the balance cabin and the sample cabin, so that the balance cabin and the sample cabin are communicated at the bottom, and the gas released by decomposing the natural gas hydrate can be ensured to be fully collected in the sample cabin and not to be diffused into the balance cabin.
Of course, in embodiments other than the present invention, the balance chamber and the sample chamber may be directly connected to each other, or both ends of the connection pipe may be integrally provided with the sample chamber and the balance chamber, respectively.
In this embodiment, the balance cabin is parallel to the sample cabin, and the bottom of the balance cabin and the bottom of the sample cabin are located on the same horizontal line, so that when the natural gas hydrate releases methane, the balance cabin and the sample cabin form a pressure difference more conveniently, and therefore methane gas is pressed into the gas outlet device and is discharged from the gas outlet nozzle.
In this embodiment, the decomposing and combusting device for the liquid nitrogen frozen natural gas hydrate sample further comprises a base 10, and the bottom of the balance chamber and the bottom of the sample chamber are fixedly arranged on the base respectively. This is provided to secure the sample compartment and the balance compartment.
The decomposition and combustion method of the liquid nitrogen frozen natural gas hydrate sample comprises the following steps:
taking a natural gas hydrate sample mixed with liquid nitrogen out of a liquid nitrogen tank, placing the natural gas hydrate sample into a sample cabin, and filling water into the sample cabin, wherein the water surfaces in the sample cabin and a balance cabin are kept at the same height;
step two, covering a sealing cover on the methane detector, and opening the regulating valve; under the same temperature and pressure, the boiling point of liquid nitrogen is-196 ℃, the decomposition temperature of the natural gas hydrate is-45 ℃, namely, the boiling point of liquid nitrogen is lower than the decomposition temperature of the natural gas hydrate, and liquid nitrogen attached to a natural gas hydrate sample mixed with liquid nitrogen volatilizes into nitrogen at first, and is discharged from an air outlet nozzle after emerging from the water surface;
step three, along with the temperature rise, the natural gas hydrate sample starts to decompose and release methane gas, and the methane detector can immediately detect the rapid increase of the methane concentration; at the moment, the regulating valve is closed, so that gas released by decomposing the natural gas hydrate sample is gathered at the top end of the sample cabin, the pressure of the sample cabin is increased along with the increase of the released gas, and water in the sample cabin enters the balance cabin, so that the water surface in the balance cabin is higher than the sample cabin, and the pressure is provided for gas discharge; when no bubble is generated in the natural gas hydrate sample, the natural gas hydrate sample is completely decomposed;
and fourthly, connecting the vacuumized atmosphere sampling bag with an air outlet nozzle, slowly opening a regulating valve, and collecting the gas at the top of the sample cabin into the atmosphere sampling bag through the air outlet nozzle.
Preferably, the decomposition and combustion method of the liquid nitrogen frozen natural gas hydrate sample further comprises the following steps:
step five, detecting the flow velocity and the total flow of the gas passing through the gas outlet nozzle by using a gas flowmeter;
step six, detecting whether oxygen is mixed by using an oxygen detector, if so, performing sealing operation;
if not, entering the next step;
and seventhly, controlling the speed of gas flowing out of the gas outlet nozzle through the regulating valve, igniting, and burning the collected gas in a controllable state.
The working principle of the decomposing and burning device for the liquid nitrogen frozen natural gas hydrate sample is as follows:
and taking the natural gas hydrate sample out of the liquid nitrogen tank, placing the natural gas hydrate sample into a sample cabin, filling water, and keeping the water level in the sample cabin and the balance cabin equal. And (5) covering a sealing cover and opening the regulating valve. At the same temperature and pressure, the boiling point of liquid nitrogen is-196 ℃ and the decomposition temperature of natural gas hydrate is-45 ℃, so that liquid nitrogen attached to a sample volatilizes into nitrogen first, and the nitrogen is discharged from an air outlet nozzle after emerging from the water surface. Then, as the temperature rises, the natural gas hydrate sample starts to decompose to release methane gas, and the methane detector can immediately detect the rapid increase of the methane concentration. At this time, the regulating valve is closed, so that the gas released by decomposing the natural gas hydrate sample is gathered at the top end of the sample cabin, the pressure of the sample cabin is increased along with the increase of the released gas, and water in the sample cabin enters the balance cabin through the communicating pipe, so that the water surface in the balance cabin is higher than the sample cabin, and the pressure is provided for gas discharge. When the natural gas hydrate sample has no bubbles generated, it can be considered to have been completely decomposed. At this time, the vacuumized atmosphere sampling bag can be connected with the air outlet nozzle, the regulating valve is slowly opened, the gas at the top of the sample cabin is collected into the atmosphere sampling bag through the air outlet nozzle for subsequent research, and the gas flowmeter can display the flow rate and the total flow rate of the gas when the gas passes through the air outlet nozzle. If the gas needs to be ignited, the speed of the gas flowing out of the gas outlet nozzle can be controlled by a regulating valve, so that the gas can be burnt in the air. Since the gas component decomposed from natural gas hydrate is mainly methane, there is a possibility of explosion if oxygen is mixed and ignited. Therefore, the sealing cover is provided with the oxygen detector, so that whether oxygen is mixed in or not can be detected, and the safety of operation is ensured.
Although the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, means, method and steps described in the specification. Those of ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, means, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope such processes, apparatuses, means, methods, or steps.
Claims (8)
1. The method for decomposing and burning the liquid nitrogen frozen natural gas hydrate sample is characterized by comprising the steps of decomposing and burning the liquid nitrogen frozen natural gas hydrate sample through a decomposing and burning device, wherein the decomposing and burning device comprises a sample cabin, a balance cabin, an air outlet device, a regulating valve, an oxygen detector, a gas flowmeter and a methane detector, the sample cabin is communicated with the balance cabin, and the height of the balance cabin is larger than that of the sample cabin; one end of the air outlet device is communicated with the sample cabin, and the other end of the air outlet device is provided with an air outlet nozzle; the regulating valve is arranged on the air outlet device and is positioned below the air outlet nozzle; one end of the methane detector extends into the sample cabin and is communicated with the sample cabin, and a sealing device is arranged between the methane detector and the sample cabin;
the decomposition and combustion method comprises the following steps:
1) Taking out the natural gas hydrate sample mixed with liquid nitrogen from the liquid nitrogen tank, placing the natural gas hydrate sample into a sample cabin, and filling water into the sample cabin, wherein the water surfaces in the sample cabin and a balance cabin are kept at the same height;
2) Covering a sealing device on the methane detector, and opening the regulating valve; under the same temperature and pressure, the boiling point of the liquid nitrogen is lower than the decomposition temperature of the natural gas hydrate, and the liquid nitrogen attached to the natural gas hydrate sample mixed with the liquid nitrogen volatilizes into nitrogen at first, and is discharged from the air outlet nozzle after emerging from the water surface;
3) As the temperature rises, the natural gas hydrate sample starts to decompose to release methane gas, and the methane detector detects the increase of the methane concentration; at the moment, the regulating valve is closed, so that gas released by decomposing the natural gas hydrate sample is gathered at the top end of the sample cabin, the pressure of the sample cabin is increased along with the increase of the released gas, and water in the sample cabin enters the balance cabin, so that the water surface in the balance cabin is higher than the sample cabin, and the pressure is provided for gas discharge; when no bubble is generated in the natural gas hydrate sample, the natural gas hydrate sample is completely decomposed;
4) Connecting the vacuumized atmosphere sampling bag with an air outlet nozzle, slowly opening a regulating valve, and collecting the gas at the top of the sample cabin into the atmosphere sampling bag through the air outlet nozzle;
5) Detecting the flow rate and the total flow of the gas passing through the gas outlet nozzle by using a gas flowmeter;
6) Detecting whether oxygen is mixed or not by using an oxygen detector, if yes, performing sealing operation;
if not, entering the next step;
7) The speed of the gas flowing out of the gas outlet nozzle is controlled by the regulating valve to ignite, and the collected gas is burnt in a controllable state.
2. The method for decomposing and burning a liquid nitrogen frozen natural gas hydrate sample according to claim 1, wherein a sealing cover is arranged between the methane detector and the sample compartment, and the sealing cover is arranged around one end of the methane detector extending into the sample compartment.
3. The method for decomposing and burning a liquid nitrogen frozen natural gas hydrate sample according to claim 1, wherein one end of the oxygen detector extends into the sample compartment and is communicated with the sample compartment, a sealing cover is arranged between the oxygen detector and the sample compartment, and the sealing cover is arranged around one end of the oxygen detector extending into the sample compartment.
4. A method of decomposing and combusting a sample of liquid nitrogen frozen natural gas hydrate as recited in claim 3, wherein the oxygen detector and the methane detector are located on either side of the gas outlet means.
5. The method of decomposing and combusting a sample of liquid nitrogen frozen natural gas hydrate of claim 1, wherein the gas flow meter is disposed on the gas outlet means below the regulator valve.
6. The method for decomposing and burning a liquid nitrogen frozen natural gas hydrate sample according to claim 1, further comprising a communicating pipe, wherein the balance chamber is communicated with the sample chamber through the communicating pipe, and both ends of the communicating pipe are respectively positioned at the lower ends of the balance chamber and the sample chamber.
7. The method of decomposing and burning a liquid nitrogen frozen natural gas hydrate sample according to any one of claims 1 to 6, wherein the balance chamber is disposed in parallel with the sample chamber, and the balance chamber bottom is on the same horizontal line as the sample chamber bottom.
8. The method of decomposing and burning a liquid nitrogen frozen natural gas hydrate sample as recited in claim 7, further comprising a base, wherein a bottom of the balance chamber and a bottom of the sample chamber are fixedly disposed on the base, respectively.
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