CN107400542B - Nano graphite fluid for enhancing purification of coal bed gas - Google Patents

Nano graphite fluid for enhancing purification of coal bed gas Download PDF

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CN107400542B
CN107400542B CN201710853788.4A CN201710853788A CN107400542B CN 107400542 B CN107400542 B CN 107400542B CN 201710853788 A CN201710853788 A CN 201710853788A CN 107400542 B CN107400542 B CN 107400542B
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bed gas
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CN107400542A (en
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钟栋梁
严瑾
丁坤
邹镇林
易达通
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Chongqing University
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    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/10—Working-up natural gas or synthetic natural gas
    • C10L3/101—Removal of contaminants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1418—Recovery of products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1493—Selection of liquid materials for use as absorbents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/10—Working-up natural gas or synthetic natural gas
    • C10L3/101—Removal of contaminants
    • C10L3/105—Removal of contaminants of nitrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/24—Hydrocarbons
    • B01D2256/245—Methane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/10—Single element gases other than halogens
    • B01D2257/102—Nitrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/10—Single element gases other than halogens
    • B01D2257/104—Oxygen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
    • C10L2290/541—Absorption of impurities during preparation or upgrading of a fuel
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
    • C10L2290/542—Adsorption of impurities during preparation or upgrading of a fuel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/20—Capture or disposal of greenhouse gases of methane

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  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
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  • Analytical Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

The invention discloses a nano-grade material for reinforcing coal bed gas purificationA graphite fluid. The raw materials of the nano graphite fluid are nano graphite particles, base liquid, a dispersing agent and a thermodynamic additive, the nano graphite particles, the base liquid, the dispersing agent and the thermodynamic additive are dispersed into the nano graphite fluid through a mechanical stirring and ultrasonic dispersion instrument to obtain the adsorbent, the preparation method of the nano graphite particles comprises the steps of ball milling graphite in liquid carbon dioxide, grinding the graphite until the particle size is 0.1-0.2mm, pressurizing the ground graphite and the liquid carbon dioxide at normal temperature, placing for 30-45min under the pressure, heating to 150-200 ℃, releasing the pressure to normal pressure within 3min to obtain the nano graphite particles, and the particle size of the nano graphite particles is 20-80 nm. CH of the invention4The recovery method is simple, the cost is low, and the recovery rate of methane in the low-concentration coal bed gas is greatly increased.

Description

Nano graphite fluid for enhancing purification of coal bed gas
Technical Field
The invention relates to a nano graphite fluid for strengthening purification of coal bed gas, belonging to the technical field of energy.
Background
The gas with the methane concentration less than 30% is extracted in the coal mining process and is called low-concentration coal bed gas. At present, a small part of low-concentration coal bed gas is used for power generation, and a large part of low-concentration coal bed gas is directly emptied. With the successive departure of the breakthrough progress and the central fiscal duty supporting policy of the low-concentration coal bed gas power generation technology initiated in the world in China, the low-concentration coal bed gas drained in white for ensuring the production safety of coal mines can be changed into waste and treasure. As the Shanxi province which is the first major province of coal in China, if a large amount of evacuated low-concentration coal bed gas in the existing coal mine can be used for power generation and heat generation, the pollution of methane emission to the environment can be reduced, and better economic benefit can be brought to the coal mine. Along with the exploration and exploitation of coal resources, coal bed gas is found in large quantities as an associated resource. Although the utilization of low-concentration coal bed gas in Shanxi province starts in individual coal mines, most coal mine enterprises do not utilize the low-concentration coal bed gas at present due to insufficient recognition and attention degrees. The national coal mine coal bed gas extraction reaches hundreds of millions of cubic meters, but the utilization rate is less than 50%, and the low-concentration coal bed gas of about 50 hundreds of millions of cubic meters and the mine ventilation coal bed gas of nearly hundreds of millions of cubic meters are basically not utilized and are directly pumped and discharged for emptying, so that the greenhouse gas emission is increased, and the waste of coal bed gas resources is also caused.
At present, the effective utilization ways of low-concentration coal bed gas and ventilated coal bed gas are mainly three ways: separation and purification of low-concentration coal bed gas, power generation of low-concentration coal bed gas and oxidation utilization of ventilated coal bed gas. By utilizing the core technology mastered in China, the coal bed gas of the coal mine is fully utilized, so that the method is technically feasible and has strong economic and social benefits.
Firstly, there is a large space for realizing emission reduction through utilization of coal bed gas. Because the discharge amount of the coal bed gas is large, the total emission reduction amount can be realized through the utilization of the coal bed gas, and if the low-concentration coal bed gas and the ventilation coal bed gas of a 100 ten thousand ton coal mine enterprise (average condition calculation) are completely utilized, the carbon emission reduction is equivalent to 20 ten thousand cars. After the existing coal bed gas emptying resources in Shanxi province are completely utilized, the realized emission reduction amount exceeds the total carbon emission amount of all automobiles in the province. Secondly, technical reserve is made for the development of the future coal industry. With the continuous maturity of low-concentration coal bed gas utilization and ventilated coal bed gas oxidation technology, the coal bed gas in the future coal mining process is not allowed to be directly discharged like the sewage in the current industrial production and must be treated. If the coal bed gas utilization industry is developed in advance, the influence of the forced execution of the standard of coal bed gas discharge in the future on the industry development can be reduced. Thirdly, the safe production of the coal mine is promoted. When the pumping and wind discharging coal bed gas is not utilized, the safety production is only realized. Because no economic benefit is promoted, in the actual operation of part of coal mines, cost is saved, lucky psychology is kept, hidden danger is brought to safe production, after the coal bed gas is utilized, economic benefit is achieved, the enthusiasm of the coal mines is greatly increased, and meanwhile, safe production is promoted.
The efficient utilization of low-concentration coal bed gas resources has great significance for energy structure adjustment and environmental protection in China, and conventional low-concentration coal bed gas purification methods include a low-temperature liquefaction method, a pressure swing adsorption method, a membrane separation method and the like. Compared with the conventional separation method, the method for separating the low-concentration coal bed gas by using the gas hydrate method has the advantages of high gas storage rate, simple raw materials, cyclic utilization and the like, and has good application prospect.
Disclosure of Invention
The invention relates to a nano graphite fluid for strengthening coal bed gas purification, which couples adsorption and gas hydration, invents a preparation method of a novel porous nano fluid, and uses the nano fluid for low-concentration coal bed gas purification, thereby extending a novel low-concentration coal bed gas strengthening and purifying technology. The method for separating the low-concentration coal bed gas has the advantages of high gas storage rate, simple raw materials, cyclic utilization and the like, and can obtain higher CH4Recovery rate and separation efficiency.
In order to achieve the above purpose, the raw materials of the nano-graphite fluid for enhancing the purification of coal bed gas of the present invention are nano-graphite particles, a base solution, a dispersant and a thermodynamic additive, the preparation method of the nano-graphite fluid comprises the steps of dispersing the nano-graphite particles, the base solution, the dispersant and the thermodynamic additive by a mechanical stirring and ultrasonic dispersion instrument to prepare the nano-graphite fluid, namely the adsorbent, wherein the stirring speed of the mechanical stirring is 200r/min, the power of the ultrasonic dispersion instrument is 0.08kw, and the mass ratio of the nano-graphite particles, the base solution, the dispersant and the thermodynamic additive is 0.26: 246: 0.13: 9.9; the preparation method of the nano graphite particles comprises the steps of carrying out ball milling on graphite in liquid carbon dioxide, grinding the graphite to the particle size of 0.1-0.2mm, pressurizing the ground graphite and the liquid carbon dioxide at normal temperature to the pressure of 20-30 atmospheric pressures, placing the graphite and the liquid carbon dioxide under the pressure for 30-45min, heating to 150-200 ℃, and releasing the pressure to the normal pressure within 3min to obtain the nano graphite particles, wherein the particle size of the nano graphite particles is 20-80 nm.
The base liquid is deionized water.
The mass ratio of the milled graphite to the liquid carbon dioxide is 1-5: 20.
the process of using the nano graphite fluid for strengthening the purification of the coal bed gas is to purify the coal bed gasPumping into a container filled with nano-graphite fluid, and introducing CH therein at low temperature and high pressure4Forming hydrate with the nano-graphite fluid at 4 deg.C and 3.6MPa, and other gases are diffused to react with CH4The nano-graphite fluid forming the hydrate is dissipated from the nano-graphite fluid through high temperature and reduced pressure, and dissipated CH is collected4And returning the nano graphite fluid after methane separation to the container for continuous use.
The invention discloses a novel porous graphite nanofluid, which is characterized in that the traditional low-concentration coal bed gas separation method has the defects of low gas storage rate, low separation efficiency, high separation cost and the like, the low-concentration coal bed gas separated by a gas hydrate method has the advantages of high gas storage rate, simple raw materials, cyclic utilization and the like, the low-concentration coal bed gas adsorption method and the hydrate method are coupled, the gas-liquid contact surface is greatly increased, and the CH in the coal bed gas is strengthened4The adsorption action of the catalyst strengthens the heat and mass transfer in the purification process of the coal bed gas and promotes the generation of gas hydrate, thereby greatly improving the gas storage rate of methane in the hydrate phase and improving CH4Recovery rate and separation efficiency. The invention combines with the adsorption separation technology, fully utilizes the adsorption effect of the nano graphite particles and the disturbance of the generation process of hydrate in the nano fluid, and leads CH in the liquid phase to be4The content is further increased, and CH is increased4And (4) recovery efficiency.
Due to the adsorption of the nano-graphite to the methane gas and the solubilization of the nano-graphite fluid to the methane gas, the generation amount of the hydrate is increased, the content of the methane in the hydrate is greatly improved, and further the CH is ensured4The recovery efficiency is greatly increased; a nano porous medium system is constructed through the nano graphite, which is equivalent to increase a gas-liquid interface, improves the generation efficiency of the hydrate, and finally promotes the recovery rate of methane in the low-concentration coal bed gas to be greatly increased.
The invention has the beneficial effects that: the recovery method is simple, the cost is low, and the recovery rate of methane in the low-concentration coal bed gas is greatly increased.
Detailed Description
The present invention will be described in further detail with reference to examples.
The nano-graphite fluid for reinforcing coal bed gas purification is prepared by dispersing nano-graphite particles, base liquid, a dispersing agent and a thermodynamic additive into the nano-graphite fluid through a mechanical stirring device and an ultrasonic dispersion instrument to obtain an adsorbent, wherein the stirring speed of the mechanical stirring is 200r/min, the power of the ultrasonic dispersion instrument is 0.08kw, and the mass ratio of the nano-graphite particles to the base liquid to the dispersing agent to the thermodynamic additive is 0.26: 246: 0.13: 9.9; the dispersing agent is sodium dodecyl sulfate, the thermodynamic additive is tetrahydrofuran, and the preparation method of the nano graphite particles comprises the steps of ball milling graphite in liquid carbon dioxide, grinding the graphite until the particle size is 0.1-0.2mm, pressurizing the ground graphite and the liquid carbon dioxide at normal temperature until the pressure is 20-30 atmospheric pressures, placing the graphite and the liquid carbon dioxide under the pressure for 30-45min, heating to 150-200 ℃, and releasing the pressure to the normal pressure within 3min to obtain the nano graphite particles, wherein the particle size of the nano graphite particles is 20-80 nm.
The base liquid is deionized water.
The mass ratio of the milled graphite to the liquid carbon dioxide is 1-5: 20.
the process of using the nano-graphite fluid to enhance the purification of the coal bed gas comprises the steps of pumping the coal bed gas into a container filled with the nano-graphite fluid, and adopting low temperature and high pressure to extract CH in the coal bed gas4Forming gas hydrate with the nano-graphite fluid at 4 deg.C and 3.6MPa, and N2、O2Other gases will escape with CH4The nanometer graphite fluid forming hydrate is heated and decompressed to enrich CH4Escaping from the nano graphite fluid and collecting the escaped CH4And returning the nano graphite fluid after methane separation for continuous use.
Example 1
The nano-graphite fluid for reinforcing coal bed gas purification is prepared by dispersing nano-graphite particles, base liquid, a dispersing agent and a thermodynamic additive into the nano-graphite fluid through a mechanical stirring device and an ultrasonic dispersion instrument to obtain an adsorbent, wherein the stirring speed of the mechanical stirring is 200r/min, the power of the ultrasonic dispersion instrument is 0.08kw, and the mass ratio of the nano-graphite particles to the base liquid to the dispersing agent to the thermodynamic additive is 0.26: 246: 0.13: 9.9; the dispersing agent is sodium dodecyl sulfate, the thermodynamic additive is tetrahydrofuran, and the preparation method of the nano graphite particles comprises the steps of ball milling graphite in liquid carbon dioxide, grinding the graphite until the particle size is 0.15mm, pressurizing the ground graphite and the liquid carbon dioxide at normal temperature until the pressure is 25 atm, placing the graphite and the liquid carbon dioxide under the pressure for 42min, heating the graphite and the liquid carbon dioxide to 185 ℃, and releasing the pressure to the normal pressure within 3min to obtain the nano graphite particles, wherein the particle size of the nano graphite particles is 50 nm.
The base liquid is deionized water.
The mass ratio of the milled graphite to the liquid carbon dioxide is 2.5: 20.
the process of using the nano-graphite fluid to enhance the purification of the coal bed gas comprises the steps of pumping the coal bed gas into a container filled with the nano-graphite fluid, and adopting low temperature and high pressure to extract CH in the coal bed gas4Forming gas hydrate with the nano-graphite fluid at 4 deg.C and 3.6MPa, and N2、O2Other gases will escape with CH4Increasing the temperature and reducing the pressure of the nano-graphite fluid forming the hydrate to enrich the CH4Escaping from the nano graphite fluid and collecting the escaped CH4And returning the nano graphite fluid after methane separation for continuous use.
Example 2
The nano-graphite fluid for reinforcing coal bed gas purification is prepared by dispersing nano-graphite particles, base liquid, a dispersing agent and a thermodynamic additive into the nano-graphite fluid through a mechanical stirring device and an ultrasonic dispersion instrument to obtain an adsorbent, wherein the stirring speed of the mechanical stirring is 200r/min, the power of the ultrasonic dispersion instrument is 0.08kw, and the mass ratio of the nano-graphite particles to the base liquid to the dispersing agent to the thermodynamic additive is 0.26: 246: 0.13: 9.9; the dispersing agent is sodium dodecyl sulfate, the thermodynamic additive is tetrahydrofuran, and the preparation method of the nano graphite particles comprises the steps of ball milling graphite in liquid carbon dioxide, grinding the graphite until the particle size is 0.15mm, pressurizing the ground graphite and the liquid carbon dioxide at normal temperature until the pressure is 24 atmospheric pressures, placing the graphite and the liquid carbon dioxide under the pressure for 39min, heating the graphite and the liquid carbon dioxide to 185 ℃, and releasing the pressure to the atmospheric pressure within 3min to obtain the nano graphite particles, wherein the particle size of the nano graphite particles is 50 nm.
The base liquid is deionized water.
The mass ratio of the milled graphite to the liquid carbon dioxide is 2.1: 20.
the process of using the nano-graphite fluid to enhance the purification of the coal bed gas comprises the steps of pumping the coal bed gas into a container filled with the nano-graphite fluid, and adopting low temperature and high pressure to extract CH in the coal bed gas4Forming hydrate with the nano-graphite fluid at 4 deg.C and 3.6MPa, and other gases are diffused to react with CH4Subjecting the nano-graphite fluid forming the hydrate to high temperature and reduced pressure to enrich CH4Escaping from the nano graphite fluid and collecting the escaped CH4And returning the nano graphite fluid after methane separation for continuous use.
Example 3
The nano-graphite fluid for reinforcing coal bed gas purification is prepared by dispersing nano-graphite particles, base liquid, a dispersing agent and a thermodynamic additive into the nano-graphite fluid through a mechanical stirring device and an ultrasonic dispersion instrument to obtain an adsorbent, wherein the stirring speed of the mechanical stirring is 200r/min, the power of the ultrasonic dispersion instrument is 0.08kw, and the mass ratio of the nano-graphite particles to the base liquid to the dispersing agent to the thermodynamic additive is 0.26: 246: 0.13: 9.9; the dispersing agent is sodium dodecyl sulfate, the thermodynamic additive is tetrahydrofuran, and the preparation method of the nano graphite particles comprises the steps of ball milling graphite in liquid carbon dioxide, grinding the graphite until the particle size is 0.15mm, pressurizing the ground graphite and the liquid carbon dioxide at normal temperature until the pressure is 25 atm, placing the graphite and the liquid carbon dioxide under the pressure for 39min, heating the graphite to 180 ℃, and releasing the pressure to the normal pressure within 3min to obtain the nano graphite particles, wherein the particle size of the nano graphite particles is 50 nm.
The base liquid is deionized water.
The mass ratio of the milled graphite to the liquid carbon dioxide is 3.5: 20.
the process of using the nano-graphite fluid to enhance the purification of the coal bed gas comprises the steps of pumping the coal bed gas into a container filled with the nano-graphite fluid, and adopting low temperature and high pressure to extract CH in the coal bed gas4Forming hydrate with the nano-graphite fluid at 4 deg.C and 3.6MPa, and other gases are diffused to react with CH4Subjecting the nano-graphite fluid forming the hydrate to high temperature and reduced pressure to enrich CH4Escaping from the nano graphite fluid and collecting the escaped CH4And returning the nano graphite fluid after methane separation for continuous use.
The best results obtained are the following:
Figure BDA0001413077560000081
finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims (3)

1. The nano-graphite fluid for reinforcing coal bed gas purification is characterized in that raw materials of the nano-graphite fluid are nano-graphite particles, base liquid, a dispersing agent and a thermodynamic additive, the preparation method of the nano-graphite fluid comprises the steps of dispersing the nano-graphite particles, the base liquid, the dispersing agent and the thermodynamic additive into the nano-graphite fluid through mechanical stirring and an ultrasonic dispersion instrument to obtain an adsorbent, wherein the stirring speed of the mechanical stirring is 200r/min, the power of the ultrasonic dispersion instrument is 0.08kw, and the mass ratio of the nano-graphite particles to the base liquid to the dispersing agent to the thermodynamic additive is 0.26: 246: 0.13: 9.9; the dispersing agent is sodium dodecyl sulfate, the thermodynamic additive is tetrahydrofuran, the preparation method of the nano graphite particles comprises the steps of ball-milling graphite in liquid carbon dioxide, grinding until the particle size is 0.15mm, and the mass ratio of the ground graphite to the liquid carbon dioxide is 2.1: 20, pressurizing the ground graphite and liquid carbon dioxide at normal temperature until the pressure is 24 atmospheric pressures, standing for 39min under the pressure, then heating to 185 ℃, and releasing the pressure to the normal pressure within 3min to obtain nano graphite particles, wherein the particle size of the nano graphite particles is 50 nm.
2. The nanographitic fluid for enhanced purification of coal bed methane of claim 1, wherein the base fluid is deionized water.
3. The nano-graphite fluid for enhancing coal bed gas purification of claim 1, wherein the nano-graphite fluid is used for enhancing coal bed gas purification by pumping coal bed gas into a container filled with the nano-graphite fluid, and using low temperature and high pressure to extract CH in the coal bed gas4Forming hydrate with the nano-graphite fluid at 4 deg.C and 3.6MPa, and other gases are diffused to react with CH4Subjecting the nano-graphite fluid forming the hydrate to high temperature and reduced pressure to enrich CH4Escaping from the nano graphite fluid and collecting the escaped CH4And returning the nano graphite fluid after methane separation for continuous use.
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