CN109872828B - System and method for separating xenon-krypton gas mixture by using hydrate method - Google Patents
System and method for separating xenon-krypton gas mixture by using hydrate method Download PDFInfo
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Abstract
The invention provides a method and a system for separating xenon-krypton mixed gas by using a hydrate method, belonging to the technical application field of hydrates. The invention mainly comprises a gas hydrate generating unit, a heat exchange unit and a gas-water separation unit: pre-cooled xenon-krypton mixed gas is injected from the bottom of the reaction tower, and xenon in the mixed gas and water attached to the porous tower plate generate xenon hydrate; injecting water from the top of the tower to wet the porous tower plate, flushing and collecting the generated hydrate particles to the bottom of the tower to form hydrate slurry, decomposing xenon hydrate in the slurry after passing through the heat exchange unit to form gas-water two-phase flow, and then entering the gas-water separation unit, and separating xenon from decomposed water under the action of gravity to realize purification of xenon. The method has the advantages of low energy consumption, mild xenon separation conditions, high separation selectivity, simple process and easy realization of industrial production, and provides a new technical process choice for separating the xenon-krypton mixed gas.
Description
Technical Field
The invention belongs to the technical application field of hydrates, and relates to a system and a method for separating xenon-krypton mixed gas by using a hydrate method.
Background
The nuclear energy has the characteristics of no emission, high energy density and the like, and becomes a potential new energy source for replacing fossil fuels. However, the highly radioactive waste gases generated during nuclear energy utilization must be recovered from the nuclear waste and sealed into the pressure vessel until the gases are no longer radioactive. In the radioactive exhaust gas, the volume ratio of xenon (Xe) to krypton (Kr) is 91:9, and the radioactive element85Kr has a half-life of up to 10.8 years,127xe has a relatively short half-life (36.3 days), and the above-mentioned radioactive elements are liable to cause air pollution and harm to human health, and therefore need to be recovered from waste materials. Furthermore, xenon (Xe) is an important rare resource and is widely used in the research fields of semiconductors, lasers, medical devices, and the like. Currently the main source of xenon is its capture from air, which has a concentration of 0.09ppm in air. The industrially mature method is to obtain high-purity xenon and krypton (Kr) from air by low-temperature distillation, and after air is liquefied, each product is obtained in a distillation tower at different temperatures, and finally, xenon-krypton mixed gas (xenon/krypton: 20/80, v/v) is obtained. If xenon can be separated from krypton from nuclear industrial waste gas, the waste gas treatment amount is reduced, and the xenon source can be increased, so that the xenon yield is improved.
At present, the separation method of xenon krypton mainly comprises the following steps: low-temperature distillation and solid adsorption separation. The principle of low-temperature distillation is to separate components in a rectifying tower by utilizing different boiling points of xenon and krypton (xenon: -108.12 ℃ and krypton: -153.22 ℃) through multiple processes of partial condensation and partial evaporation. The method has great technical difficulty and extremely strict requirements on production operation procedures. The equipment needs to withstand high pressure and low temperature and has huge energy consumption. The solid adsorption separation method utilizes the selective adsorption property of the adsorbent to realize the separation or purification of gas components. The method has low energy consumption and high separation efficiency, but has expensive preparation cost and is not suitable for large-scale commercial production.
The hydrate method is a novel gas separation technology. The principle is that different gases are utilized to form different phase equilibrium conditions and different degrees of difficulty of hydrates, the components which are easy to form the hydrates in the mixed gas are preferentially combined with water to form the hydrates, and gas molecules are wrapped in a cage-shaped structure formed by water molecules, so that the effective separation of the mixed gas is realized. Under the temperature condition of 2 ℃, the corresponding phase equilibrium pressures of the xenon hydrate and the krypton hydrate are respectively 0.17 MPa and 1.82 MPa, and the huge phase equilibrium difference provides a theoretical basis for separating the xenon and the krypton by a hydrate method.
Disclosure of Invention
The invention mainly aims to provide a method and a system for separating xenon-krypton gas mixture by using a hydrate method
The invention is realized by the following technical scheme:
a system for separating xenon-krypton gas mixture by using a hydrate method comprises a gas hydrate generating unit, a heat exchange unit and a gas-water separating unit;
the main equipment of the gas hydrate generating unit is a reaction tower, pre-cooled xenon krypton gas mixed gas is injected into the tower from the bottom of the reaction tower through a gate valve A and a flow regulating valve A, a gas-liquid separation membrane is placed at the bottom of a porous tower plate which is contacted with the mixed gas firstly, the interface area of the gas-liquid separation membrane is larger than the cross section area of the reaction tower, and the gas-liquid separation membrane is built between the porous tower plate and the tower bottom in an inclined manner and is used for preventing hydrate slurry from blocking a gas inlet at the tower bottom and simultaneously guiding the collection of the hydrate slurry;
in the ascending process of the mixed gas in the reaction tower, xenon is contacted with water attached to the porous tower plate to generate xenon hydrate particles, residual gas is discharged from the top of the reaction tower, and a back pressure control valve is arranged at the outlet of the top of the reaction tower and used for stabilizing the air pressure in the reaction tower and ensuring the continuous generation of the xenon hydrate in the reaction tower; and pre-cooling water is injected from the top of the tower through a gate valve B and a flow regulating valve F, is used for generating hydrates on one hand, and flushes hydrate particles on the porous tower plate into a space surrounded by the gas-liquid separation membrane and the tower wall on the other hand, and then is converged into hydrate slurry which enters the heat exchange unit through the flow regulating valve B.
The main equipment of the heat exchange unit is a heat exchanger A and a heat exchanger B, and hydrate slurry enters the heat exchange unit in two paths after passing through a fluid flow dividing device; one path of hydrate slurry is used as cold fluid and enters a heat exchanger B after being pressurized by a flow regulating valve C and a delivery pump B, hot fluid of the heat exchanger B is decomposed water from a gas-water separation unit, hydrate particles in the slurry absorb heat carried by the decomposed water to be decomposed through heat exchange between cold and hot fluids, the hydrate slurry is converted into gas-water two-phase flow and enters the gas-water separation unit through a delivery pump E, and the cooled decomposed water is injected into a reaction tower through a delivery pump G and the flow regulating valve F; and the other path of hydrate slurry enters a heat exchanger A as a cold fluid through a flow regulating valve D and a delivery pump A, a hot fluid of the heat exchanger A is a normal-temperature xenon-krypton gas mixed gas pressurized by the delivery pump D, hydrate particles in the slurry absorb heat carried by the normal-temperature mixed gas to be decomposed through heat exchange between cold and hot fluids, the hydrate slurry is converted into a gas-water two-phase flow and enters a gas-water separation unit through a delivery pump E, and the cooled mixed gas enters the reaction tower from the bottom of the tower through a delivery pump C and the flow regulating valve A. The heat exchange unit fully utilizes heat carried by raw materials (normal-temperature xenon krypton gas mixed gas and decomposed water) to realize hydrate decomposition and raw material precooling at low energy consumption cost.
The main equipment of the gas-water separation unit is a gas-water separation tower, gas-water two-phase flow containing xenon is pressurized by a delivery pump E and then injected from the middle position of the gas-water separation tower, and the xenon is separated from decomposed water under the action of gravity, wherein the xenon rises to the top of the tower and is output by a flow regulating valve E after being dehumidified by a drying bed; the decomposed water sinks to the bottom of the tower, and enters a heat exchanger B to participate in heat exchange after being pressurized by a delivery pump F. The hydrate decomposition water contains a large amount of xenon micro-nano bubbles, and the decomposition water is injected back to the reaction tower to participate in the generation of the hydrate, so that the generation rate of the xenon hydrate can be greatly improved.
Further, the device also comprises a refrigerator A, B under the working condition of large mixed gas treatment capacity, wherein the refrigerator A, B is respectively used for carrying out auxiliary cooling on the xenon-krypton mixed gas from the heat exchanger A and the decomposition water from the heat exchanger B so as to ensure that the precooling temperature of the mixed gas and the decomposition water reaches the working condition set temperature; the electric heating equipment is used for carrying out auxiliary heating on the gas-water two-phase flow from the heat exchanger A and the heat exchanger B, so that the hydrate particles in the fluid are completely decomposed.
Furthermore, the porous tower plate is particularly used for obtaining plate-shaped foam copper with the porosity of 40-50% by adopting a powder metallurgy method or an electroplating method; and the surface treatment is carried out on the foam copper by adopting a dry etching method, so that the metal surface roughness is increased, and more sites are provided for hydrate nucleation.
The invention also provides a method for separating xenon-krypton mixed gas by using a hydrate method, which comprises the following steps of:
step 1, injecting normal temperature water from the side surface of the top of the reaction tower, converging the normal temperature water in a space enclosed by a gas-liquid separation membrane and the tower wall after flowing through all porous tower plates from top to bottom, entering and storing the normal temperature water in a gas-water separation tower after passing through a fluid flow dividing device, a heat exchanger A and a heat exchanger B, and taking the normal temperature water as a hot fluid of the heat exchanger when a system is started.
Step 2, adjusting a back pressure control valve at the top of the reaction tower to a preset working condition pressure; pre-cooling water is injected from the side surface of the reaction tower, after wetting the porous tower plate, pre-cooling xenon krypton gas mixed gas is injected from the bottom of the tower, and forms xenon hydrate with water on the porous tower plate, the water inflow rate is increased through the flow regulating valve F, so that hydrate particles on the tower plate are washed by the water into a space surrounded by the gas-liquid separation membrane and the tower wall, and the hydrate slurry is converged to enter the heat exchange unit; the residual gas is discharged from the top of the tower;
step 4, starting a delivery pump E to inject gas-water two-phase flow from the middle position of the gas-water separation tower, separating xenon from decomposed water under the action of gravity, enabling the xenon to ascend to a drying bed, and outputting after dehumidification treatment; the decomposed water is gathered at the bottom of the tower and enters a heat exchanger B as hot fluid through a delivery pump F.
The invention has the beneficial effects that: the continuous separation of the xenon krypton at the temperature of 0 ℃ and under the lower pressure (0.5-2MPa) is realized, the copper foam plate is used as a porous tower plate, and the surface treatment is carried out on the copper foam plate, so that the xenon hydrate generation sites can be increased, the hydrate generation rate is accelerated, the hydrate particles can be fluidized, and the continuous separation of the xenon krypton is realized; the xenon hydrate is decomposed by using the mixed gas source and the heat carried by the decomposed water, so that the energy consumption caused by the conventional hydrate thermal decomposition is avoided; meanwhile, the refrigerator and the electric heating equipment are used as auxiliary heat exchange equipment, so that the separation system can meet the separation requirement of xenon and krypton under large treatment capacity; the system has low requirements on pressure resistance and heat preservation of equipment, can realize continuous separation of xenon and krypton under low energy consumption, and has great practical application value.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention;
FIG. 2 is a schematic diagram of a system configuration designed to handle larger gas throughput in accordance with the present invention;
in the figure: 1, a reaction tower; 2, a gas-liquid separation membrane; 3 porous tower plates; 4 a fluid diversion device; 5-1 flow control valve A; 5-2, back pressure control valve; 5-3 flow control valve B; 5-4 flow control valve C; 5-5 of a flow regulating valve D; 5-6 flow control valve E; 5-7 flow control valve F; 6-1 delivery pump A; 6-2 delivery pump B; 6-3 delivery pump C; 6-4 delivery pump D; 6-5 delivery pump E; 6-6 delivery pump F; 6-7 delivery pump G; 7-1 heat exchanger A; 7-2 heat exchanger B; 8, a gas-water separation tower; 9 drying the bed; 10-1 of a gate valve A; 10-2 of a gate valve B; 11-1 refrigerator A; 11-2 refrigerator B; 12 an electrical heating device.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
example 1
In the embodiment, the component ratio (v/v) of the mixed gas of xenon and krypton to be separated is Xe: 20%, Kr: 80%, namely an intermediate product obtained in the process of trapping xenon from air; as the proportion of xenon is low, the injection flow of the mixed gas needs to be controlled in a lower range to ensure that the xenon stays in the tower for enough time and forms hydrate with water, the structure diagram of the system shown in figure 1 is selected
The method comprises the following specific steps: normal temperature water (20 ℃) is injected from the top side of the reaction tower 1, flows through all the porous tower plates 3 from top to bottom, is converged in a space enclosed by the gas-liquid separation membrane 2 and the tower wall, enters the gas-water separation tower after passing through the fluid flow dividing device and the heat exchangers A and B, and is stored as hot fluid of the heat exchangers when the system is started. Adjusting a back pressure control valve 5-2 at the top of the reaction tower to a preset working condition pressure (1.5 MPa); precooling water (0 ℃) is injected from the side surface of the reaction tower, precooled xenon krypton gas mixed gas (0 ℃) is injected from the bottom of the tower after wetting the porous tower plate, xenon hydrate is generated on the porous tower plate together with water, the flow control valve A5-1 is adjusted to control the flow of the injected gas to be in a lower range, the flow of the inlet water is increased through the flow control valve F5-7, so that hydrate particles on the tower plate are flushed by the water to a space surrounded by the gas-liquid separation membrane and the tower wall, and the hydrate slurry is converged to enter the heat exchange unit; the residual gas is discharged from the top of the tower; starting a fluid flow dividing device to divide hydrate slurry into two paths; one path of the water enters a heat exchanger B7-2 as cold fluid, a delivery pump F6-6 at the bottom of the gas-water separation tower is started, prestored normal-temperature water (20 ℃) enters a heat exchanger B7-2 as hot fluid, hydrate particles in the cold fluid are decomposed through heat exchange and converted into gas-water two-phase flow to enter a gas-water separation unit, cooled water (0 ℃) is injected into the reaction tower through the delivery pump, and after the whole system operates, the decomposed water from the gas-water separation unit replaces the normal-temperature water and enters the heat exchanger B as hot fluid for heat exchange; the other path of hydrate slurry is used as cold fluid to enter a heat exchanger A7-1, meanwhile, the mixed gas (20 ℃) to be separated is used as hot fluid to enter a heat exchanger A7-1, hydrate particles in the cold fluid are decomposed through heat exchange and converted into gas-water two-phase flow to enter a gas-water separation unit, and the cooled mixed gas (0 ℃) is injected into a reaction tower through a delivery pump; starting a delivery pump to inject gas-water two-phase flow from the middle position of a gas-water separation tower, separating xenon from decomposed water under the action of gravity, enabling the xenon to ascend to a drying bed, and producing the xenon after dehumidification treatment; the decomposed water is gathered at the bottom of the tower and enters a heat exchanger B7-2 as a hot fluid through a transfer pump. By controlling the pressure in the reaction tower and the injection flow rate of the mixed gas, the Xe with the content of only 20 percent can be effectively separated from the mixed gas in the form of hydrate.
Example 2
In the embodiment, the component ratio (v/v) of the mixed gas of xenon and krypton to be separated is Xe: 91%, Kr: 9%, namely the proportion of xenon to krypton in the exhaust gas discharged from the nuclear industry; the proportion of xenon is high, so that the gas injection flow can be increased, the gas treatment capacity of the system is improved, and the system structure diagram shown in the figure II is adopted in consideration of the fact that the number of xenon hydrate particles in hydrate slurry produced from the reaction tower is large and the temperature of fluid produced after heat exchange of a heat exchanger cannot meet the working condition requirement.
The method comprises the following specific steps: normal temperature water (20 ℃) is injected from the top side of the reaction tower 1, flows through all the porous tower plates 3 from top to bottom, is converged in a space enclosed by the gas-liquid separation membrane 2 and the tower wall, enters the gas-water separation tower after passing through the fluid flow dividing device, the heat exchanger A and the heat exchanger B, and is stored as hot fluid of the heat exchanger when the system is started. Adjusting a back pressure control valve at the top of the reaction tower to a preset working condition pressure (0.5 MPa); precooling water (0 ℃) is injected from the side surface of the reaction tower, precooling xenon-krypton mixed gas (0 ℃) is injected from the bottom of the tower after wetting the porous tower plate, xenon hydrate is generated on the porous tower plate together with water, the inflow water flow is increased through a flow regulating valve F5-7, hydrate particles on the tower plate are washed by the water to a space surrounded by the gas-liquid separation membrane and the tower wall, and the hydrate particles are converged into hydrate slurry to enter the heat exchange unit; the residual gas is discharged from the top of the tower; starting a fluid flow dividing device to divide hydrate slurry into two paths; one path of the water enters a heat exchanger B as cold fluid, a delivery pump F6-6 at the bottom of the gas-water separation tower is started, prestored normal-temperature water (20 ℃) enters the heat exchanger B as hot fluid, hydrate particles in the cold fluid are completely decomposed after heat exchange and auxiliary heating of electric heating equipment, the water is converted into gas-water two-phase flow and enters a gas-water separation unit, the normal-temperature water is cooled by heat exchange and auxiliary cooling of a refrigerator B11-2, the temperature is reduced to (0 ℃) and is injected into the reaction tower, and after the whole system operates, the decomposed water from the gas-water separation unit replaces the normal-temperature water and enters the heat exchanger B7-2 as hot fluid for heat; the other path of hydrate slurry is used as cold fluid to enter a heat exchanger A7-1, meanwhile, mixed gas (20 ℃) to be separated is used as hot fluid to enter a heat exchanger A7-1, after heat exchange and auxiliary heating of the electric heating equipment 12, hydrate particles in the cold fluid are decomposed and converted into gas-water two-phase flow to enter a gas-water separation unit, and after the mixed gas is subjected to heat exchange and auxiliary cooling of a refrigerator A11-1, the temperature is reduced to (0 ℃) and then the mixed gas is injected into a reaction tower; starting a delivery pump E to inject gas-water two-phase flow from the middle position of the gas-water separation tower, separating xenon from decomposed water under the action of gravity, enabling the xenon to ascend to a drying bed, and producing the xenon after dehumidification treatment; the decomposed water is gathered at the bottom of the tower and enters a heat exchanger B7-2 as a hot fluid through a transfer pump F. By introducing the refrigeration equipment and the electric heating equipment 12, the xenon can be efficiently separated in a hydrate form under the working condition of large gas handling capacity.
Claims (4)
1. A system for separating xenon-krypton gas mixture by using a hydrate method is characterized by comprising a gas hydrate generation unit, a heat exchange unit and a gas-water separation unit;
the main equipment of the gas hydrate generating unit is a reaction tower (1), pre-cooled xenon krypton gas mixed gas is injected into the tower from the bottom of the reaction tower through a gate valve A (10-1) and a flow regulating valve A (5-1), a gas-liquid separation membrane (2) is placed at the bottom of a porous tower plate (3) which is contacted with the mixed gas firstly, the interfacial area of the gas-liquid separation membrane is larger than the cross sectional area of the reaction tower, and the gas-liquid separation membrane is built between the porous tower plate and the tower bottom in an inclined manner and is used for preventing hydrate slurry from blocking a gas inlet at the tower bottom and guiding the collection of the hydrate slurry;
in the ascending process of the mixed gas in the reaction tower, xenon is contacted with water attached to the porous tower plate (3) to generate xenon hydrate particles, residual gas is discharged from the top of the reaction tower, and a back pressure control valve (5-2) is installed at the outlet of the top of the reaction tower and used for stabilizing the gas pressure in the reaction tower and ensuring the continuous generation of the xenon hydrate in the tower; pre-cooling water is injected from the top of the tower through a gate valve B (10-2) and a flow control valve F (5-7), is used for generating hydrate on one hand, and washes hydrate particles on a porous tower plate into a space surrounded by a gas-liquid separation membrane and the tower wall on the other hand, and is converged into hydrate slurry, and the hydrate slurry enters a heat exchange unit through the flow control valve B (5-3);
the porous tower plate (3) is plate-shaped foam copper with the porosity of 40-50% obtained by adopting a powder metallurgy method or an electroplating method;
the main equipment of the heat exchange unit is a heat exchanger A (7-1) and a heat exchanger B (7-2), and hydrate slurry enters the heat exchange unit in two paths after passing through a fluid flow dividing device (4); one path of hydrate slurry is used as cold fluid and enters a heat exchanger B (7-2) after being pressurized by a flow regulating valve C (5-4) and a transfer pump B (6-2), hot fluid of the heat exchanger B is decomposed water from a gas-water separation unit, hydrate particles in the slurry absorb heat carried by the decomposed water to be decomposed through heat exchange between cold and hot fluids, the hydrate slurry is converted into gas-water two-phase flow and enters the gas-water separation unit through a transfer pump E (6-5), and the cooled decomposed water is injected into a reaction tower (1) through a transfer pump G (6-7) and a flow regulating valve F (5-7); the other path of hydrate slurry enters a heat exchanger A (7-1) as a cold fluid through a flow regulating valve D (5-5) and a delivery pump A (6-1), a hot fluid of the heat exchanger A is a normal-temperature xenon krypton gas mixed gas pressurized by the delivery pump D (6-4), hydrate particles in the slurry absorb heat carried by the normal-temperature mixed gas to be decomposed through heat exchange between cold and hot fluids, the hydrate slurry is converted into gas-water two-phase flow and enters a gas-water separation unit through a delivery pump E (6-5), and the cooled mixed gas enters a reaction tower (1) from the bottom of the tower through a delivery pump C (6-3) and the flow regulating valve A (5-1);
the main equipment of the gas-water separation unit is a gas-water separation tower (8), gas-water two-phase flow containing xenon is pressurized by a delivery pump E (6-5) and then injected from the middle position of the gas-water separation tower, and the xenon is separated from decomposed water under the action of gravity, wherein the xenon rises to the top of the tower and is output by a flow regulating valve E (5-6) after being dehumidified by a drying bed (9); the decomposed water sinks to the bottom of the tower, and enters a heat exchanger B (7-2) to participate in heat exchange after being pressurized by a transfer pump F (6-6).
2. The system for separating the xenon krypton gas mixed gas by using the hydrate method as claimed in claim 1, wherein under the working condition of large mixed gas treatment capacity, the system further comprises a refrigerator A (11-1) and a refrigerator B (11-2), and the refrigerators A (11-1) and the refrigerator B (11-2) are respectively used for carrying out auxiliary cooling on the xenon krypton gas mixed gas from the heat exchanger A (7-1) and the decomposition water from the heat exchanger B (7-2) so as to ensure that the precooling temperature of the mixed gas and the decomposition water reaches the working condition set temperature; the electric heating device (12) is used for carrying out auxiliary heating on the gas-water two-phase flow from the heat exchanger A (7-1) and the heat exchanger B (7-2) so as to ensure that hydrate particles in the flow are completely decomposed.
3. The system for separating the krypton-gas mixture containing xenon according to claim 1, wherein the surface of the copper foam is treated by a dry etching method, so that the surface roughness of the metal is increased, and more sites are provided for hydrate nucleation.
4. A method of operating a system for separating a mixture of xenon and krypton according to any one of claims 1 to 3 using a hydrate method, comprising the steps of:
step 1, injecting normal-temperature water from the top side of a reaction tower (1), enabling the water to flow through all porous tower plates (3) from top to bottom, converging the water in a space enclosed by a gas-liquid separation membrane (2) and the tower wall, and enabling the water to enter and be stored in a gas-water separation tower (8) after passing through a fluid flow dividing device (4), a heat exchanger A (7-1) and a heat exchanger B (7-2) to be used as hot fluid of the heat exchanger when a system is started;
step 2, adjusting a back pressure control valve (5-2) at the top of the reaction tower to a preset working condition pressure; precooling water is injected from the side surface of the reaction tower, precooled xenon krypton gas mixed gas is injected from the bottom of the tower after wetting the porous tower plate, xenon hydrate is generated on the porous tower plate with water, the inflow rate is increased through a flow regulating valve F (5-7), hydrate particles on the tower plate are washed by the water to a space surrounded by the gas-liquid separation membrane and the tower wall, and the hydrate particles are converged into hydrate slurry to enter the heat exchange unit; the residual gas is discharged from the top of the tower;
step 3, starting the fluid shunting device to divide the hydrate slurry into two paths; one path of the water enters a heat exchanger B (7-2) as cold fluid, a conveying pump F (6-6) at the bottom of the gas-water separation tower is started, prestored normal-temperature water enters the heat exchanger B as hot fluid, hydrate particles in the cold fluid are decomposed through heat exchange and converted into gas-water two-phase flow to enter a gas-water separation unit, cooled water is injected into a reaction tower through the conveying pump, and after the whole system operates, decomposed water from the gas-water separation unit replaces the normal-temperature water and enters the heat exchanger B as the hot fluid for heat exchange; the other path of hydrate slurry is used as cold fluid to enter a heat exchanger A (7-1), a transfer pump D (6-4) is started, mixed gas to be separated is used as hot fluid to be injected into the heat exchanger A, hydrate particles in the cold fluid are decomposed through heat exchange and converted into gas-water two-phase flow to enter a gas-water separation unit, and the cooled mixed gas is injected into a reaction tower through a transfer pump C (6-3);
step 4, starting a delivery pump E (6-5) to inject gas-water two-phase flow from the middle position of the gas-water separation tower, separating xenon from decomposed water under the action of gravity, enabling the xenon to ascend to a drying bed, and outputting after dehumidification treatment; the decomposed water is gathered at the bottom of the tower and enters a heat exchanger B as hot fluid through a transfer pump F (6-6).
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| JP2003267711A (en) * | 2002-03-18 | 2003-09-25 | Osaka Gas Co Ltd | Method and apparatus for separating and recovering rare gas |
| CN101016841A (en) * | 2007-02-13 | 2007-08-15 | 中国科学院广州能源研究所 | Method for exploiting natural gas hydrates and device thereof |
| DE102012003443A1 (en) * | 2012-02-21 | 2013-08-22 | Linde Aktiengesellschaft | Method for separating gas mixture from noble gases, involves removing gas mixture enriched with krypton gas using several plates in separation apparatus, and removing xenon gas from sump in form of gas hydrate |
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