CN107433119B - Hydration separation method and hydration separation system - Google Patents
Hydration separation method and hydration separation system Download PDFInfo
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- CN107433119B CN107433119B CN201710682364.6A CN201710682364A CN107433119B CN 107433119 B CN107433119 B CN 107433119B CN 201710682364 A CN201710682364 A CN 201710682364A CN 107433119 B CN107433119 B CN 107433119B
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Abstract
The invention provides a hydration separation method and a hydration separation system. The hydration separation method comprises the following steps: introducing mixed gas to be separated into the working solution to perform high-pressure hydration reaction, and performing high-pressure separation on a product of the high-pressure hydration reaction to form residual gas and mixed solution containing hydrate; circularly conveying a part of mixed liquor formed by high-pressure separation into the working fluid to continue high-pressure hydration reaction; and decompressing the other part of the mixed solution formed by high-pressure separation, and then performing low-pressure decomposition to form decomposed gas and decomposed liquid. The hydration separation method and the hydration separation system improve the utilization rate of the working solution and reduce the energy consumption in the separation process.
Description
Technical Field
The invention relates to a separation method, in particular to a hydration separation method and a hydration separation system.
Background
The hydrate separation technology is a new technology which utilizes the formation of hydrate crystals to separate the hydrate crystals from the original components, and the basic principle is that the hydrate crystals only contain water and hydrate forming substances, and the composition of the hydrate forming substances in the crystals is different from that of the hydrate forming substances in the original phase. The main steps of hydrate separation comprise: 1) certain (or certain) components in the mixture form solid hydrate crystals under certain pressure; 2) hydrate crystals in the mixture system are effectively separated out and then decomposed into water and hydrate formers by methods such as depressurization and the like.
The hydrate separation technology can be used for the mixed gas with lower content of hydrate forming gas and higher separation requirement; or a solution which is far lower than the saturation value, is easy to degrade and denature at higher temperature, has complex solution components, low concentration and poor thermal stability, and can not achieve economic and efficient system separation by adopting the traditional separation methods such as rectification, extraction and the like. In recent years, hydrate separation technology is applied to natural gas storage, hydrogen storage and CO2Capture and the like are receiving wide attention.
The conventional hydration separation process is to perform hydration reaction on the hydrate working solution and mixed gas after the pressure is increased, after the hydration reaction product is separated, the equilibrium gas phase is discharged out of the system to form residual gas, the hydrate and unhydrated hydrate working solution are decompressed and then enter a hydrate decomposer, the hydrate is decomposed in the decomposer, the released gas is discharged out of the system to form decomposed gas, and the hydrate working solution in the decomposer forms decomposed liquid to be recycled.
However, hydrates generated by the reaction of the gas and the hydrate working solution have viscosity, grow continuously and are easily adhered to the wall surfaces of the pipeline and the container, and the viscosity of the mixture containing the hydrates is rapidly increased along with the increase of the content of the hydrates, so that the pipeline is easily blocked; therefore, the volume content of the hydrate in the mixture containing the hydrate in the conventional hydration separation process is generally not more than 15%, the utilization rate of the hydration working solution is greatly reduced, and the energy consumption of the hydration separation process is high.
Disclosure of Invention
The invention provides a hydration separation method and a hydration separation system, which improve the utilization rate of working fluid and reduce the energy consumption in the separation process.
The invention provides a hydration separation method, which comprises the following steps:
introducing mixed gas to be separated into the working solution to perform high-pressure hydration reaction, and performing high-pressure separation on a product of the high-pressure hydration reaction to form residual gas and mixed solution containing hydrate;
circularly conveying a part of mixed liquor formed by high-pressure separation into the working fluid to continue high-pressure hydration reaction;
and decompressing the other part of the mixed solution formed by high-pressure separation, and then performing low-pressure decomposition to form decomposed gas and decomposed liquid.
The hydration separation method circularly conveys part of the mixed liquid formed by high-pressure separation into the working liquid to continue high-pressure hydration reaction, and because the mixed liquid containing hydrate is mixed in the working liquid, when the mixed gas is contacted with the working liquid, the hydrate in the working liquid shortens the induction period of the high-pressure hydration reaction, thereby improving the speed and the separation effect of the high-pressure hydration reaction; in addition, the working solution is contacted with the mixed gas for many times, so that the hydrate in the mixed solution is greatly concentrated; in addition, the hydration separation method of the invention reduces the pressure of the other part of the mixed solution formed by high-pressure separation and then carries out low-pressure decomposition, thereby avoiding reducing the pressure of the whole mixed solution and greatly reducing the energy consumption in the hydration separation process.
Further, the hydration separation method of the present invention further comprises: and pressurizing the digestion solution, mixing the digestion solution with the mixed solution, and circularly conveying the digestion solution to the working solution. The method recycles the chemical solution formed by low-pressure chemical decomposition, thereby improving the utilization rate of the working solution; meanwhile, only the other part of the mixed liquid formed by high-pressure separation is decompressed and decomposed at low pressure, so that the pressurization of the whole decomposed liquid is avoided subsequently, and the energy consumption in the separation process is further reduced.
In the present invention, it is understood that the gas mixture to be separated contains a gas (i.e., a dissociation gas) capable of undergoing a high-pressure hydration reaction with the working fluid to generate a hydrate, and a gas (i.e., a surplus gas) not undergoing a high-pressure hydration reaction with the working fluid; the composition of the mixed gas is not strictly limited, and the decomposed gas and the residual gas can be single gas or mixed gas of more than two gases. Specifically, the mixed gas to be separated includes, but is not limited to, a mixed gas of methane and air, a mixed gas of methane and nitrogen, a gas, a hydrogenation tail gas, a hydrogen-containing mixed gas, a catalytic cracking dry gas, a coking dry gas, and the like.
The conditions of the high-pressure hydration reaction are not strictly limited, as long as the high-pressure hydration reaction can be carried out on the decomposed gas and the working solution to generate the hydrate; in addition, the conditions for the high-pressure separation are not strictly limited in the present invention, as long as the remaining gas can be separated from the mixed liquid. In a specific embodiment of the present invention, the conditions of the high pressure hydration reaction are: the temperature is 3-15 ℃, and the absolute pressure is 0.5-20 MPa; the conditions for the high pressure separation may be: the temperature is 3-15 ℃, and the absolute pressure is 0.5-20 MPa; wherein the conditions of the high pressure hydration reaction and the high pressure separation may be the same or different.
The invention does not strictly limit the conditions of the low-pressure decomposition, as long as the hydrate can be decomposed into the decomposition gas and the decomposition liquid (namely the working liquid); in a specific embodiment of the present invention, the conditions of the low pressure decomposition may be: the temperature is 3-25 ℃, and the absolute pressure is 0-3 MPa. It will be appreciated that the absolute pressure of the low pressure decomposition should be less than the absolute pressure of the high pressure separation.
In the invention, the mass ratio of the part of the mixed solution which is circularly conveyed to the working solution and is subjected to the high-pressure hydration reaction to the part of the working solution which is subjected to the low-pressure hydrolysis reaction after being decompressed can be (1-2): 1; because part of the mixed liquor is circulated to carry out high-pressure hydration reaction, the pressure reduction of the whole mixed liquor is avoided, and the energy consumption in the hydration separation process is greatly reduced.
In the present invention, the volume content of the hydrate in the mixed solution may be 10 to 60%, further 10 to 50%, and further 10 to 30%. Because the concentration of hydrate in the mixed solution is high, the energy consumption in the subsequent decompression and pressurization processes is greatly reduced.
In particular, when the mixed liquid is circulated, the apparent flow rate of the mixed liquid can be controlled to be more than 2.5 m/s, and further more than 3.8 m/s, so that the problems of clogging, wall sticking, and the like caused by hydrates can be eliminated.
The invention also provides a hydration separation system, which comprises a reaction tube, a high-pressure separation device, a circulating tube and a low-pressure decomposition device,
the inlet end of the reaction tube is provided with a mixed gas inlet,
the high-pressure separation device is respectively communicated with the outlet end of the reaction tube and the inlet end of the circulating tube, a gas outlet and a liquid outlet are arranged on the high-pressure separation device, the liquid outlet is communicated with the low-pressure decomposition device through a pressure reducing valve,
the outlet end of the circulating pipe is communicated with the inlet end of the reaction pipe through a high-pressure circulating pump,
and the low pressure decomposition device is provided with a gas outlet.
Furthermore, the hydration separation system also comprises a decomposition pipe, wherein a liquid outlet is arranged on the low-pressure decomposition device, the liquid outlet is communicated with the inlet end of the decomposition pipe, and the outlet end of the decomposition pipe is communicated with the outlet end of the circulating pipe through a booster pump.
In the hydration separation system, the reaction pipe, the high-pressure separation device, the circulating pipe and the high-pressure circulating pump jointly form a high-pressure area, and the pressure reducing valve, the low-pressure digestion device, the digestion pipe and the booster pump jointly form a low-pressure area; the mixed gas contacts with the mixed liquid flowing in the high-pressure area, components which are easy to generate high-pressure hydration reaction in the mixed gas and the working liquid generate hydration reaction and enter a liquid phase, and unhydrated components in the mixed gas become residual gas to be discharged out of the system; meanwhile, the pressure reducing valve can be adjusted according to the treatment capacity to control the liquid amount flowing from the high-pressure separation device to the low-pressure decomposition device, the hydrate is decomposed to form decomposed gas and decomposed liquid under the low-pressure condition, the decomposed gas is then discharged out of the system, the decomposed liquid then enters the decomposition pipe, is pressurized by the booster pump and then is converged with the mixed liquid from the circulating pipe to enter the high-pressure circulating pump, the liquid at the outlet of the high-pressure circulating pump is contacted with the mixed gas in the reaction pipe to carry out hydration reaction, then is circulated to the high-pressure separation device to carry out high-pressure separation, and the circulation is carried out until the mixed gas is completely separated.
Wherein the high voltage region may be set as: the temperature is 3-15 ℃, and the absolute pressure is 0.5-20 MPa; the low-voltage region may be set to: the temperature is 3-25 ℃, and the absolute pressure is 0-3 MPa; the volume content of hydrate in the high-pressure area mixture is 10-60%; the superficial flow velocity of the liquid in the reaction tube and the circulation tube is greater than 2.5 m/s.
The invention also provides a hydration separation method which is carried out by utilizing the hydration separation system, and the hydration separation method comprises the following steps:
introducing mixed gas to be separated into the reaction tube, and carrying out high-pressure hydration reaction on the mixed gas and working liquid;
performing high-pressure separation on the product of the high-pressure hydration reaction in a high-pressure separation device to form residual gas and mixed liquid containing hydrate;
circularly conveying a part of the mixed liquid formed by high-pressure separation to the reaction tube through a circulating tube to continue high-pressure hydration reaction;
and reducing the pressure of the other part of the mixed liquid formed by the high-pressure separation through a pressure reducing valve, and then carrying out low-pressure decomposition in a low-pressure decomposition device to form decomposed gas and decomposed liquid.
Further, the hydration separation method further comprises: and pressurizing the digestion solution by a booster pump, and circularly conveying the digestion solution to the reaction tube through a digestion tube.
Further, the conditions of the high pressure hydration reaction and the high pressure separation may be: the temperature is 3-15 ℃, and the absolute pressure is 0.5-20 MPa; the conditions of the low pressure decomposition may be: the temperature is 3-25 ℃, and the absolute pressure is 0-3 MPa; the volume content of hydrate in the mixed solution is 10-60%; when the mixed liquid is circularly conveyed, the apparent flow velocity of the mixed liquid can be controlled to be more than 2.5 m/s.
The implementation of the invention has at least the following advantages:
1. the hydration separation method of the invention circularly conveys part of the mixed liquid formed by high-pressure separation to the working liquid to continue high-pressure hydration reaction, and the hydrate in the mixed liquid greatly shortens the induction period of the high-pressure hydration reaction, thereby improving the speed and the separation effect of the high-pressure hydration reaction.
2. In the hydration separation method, the working solution is in multiple circulating contact with the mixed gas, so that the concentration of the hydrate in the mixed solution is greatly improved, the volume content of the hydrate in the mixed solution can reach 60 percent, the subsequent treatment capacity of pressure reduction and pressurization can be greatly reduced, and the energy consumption in the hydration separation process is further greatly reduced.
3. The hydration separation method circularly conveys the mixed liquor at a higher speed, wherein the apparent flow rate of the mixed liquor is more than 2.5 m/s, thereby eliminating the problems of blockage, wall adhesion and the like caused by hydrates and being beneficial to the continuous and stable operation of the separation process.
4. The hydration separation device has simple structure and convenient operation, can improve the utilization rate of the working solution when carrying out hydration separation on the mixed gas, can reduce the energy consumption in the hydration separation process, and is favorable for large-scale popularization and application.
Drawings
FIG. 1 is a schematic process flow diagram of a hydration separation process in accordance with one embodiment of the present invention;
FIG. 2 is a schematic diagram of a hydration separation system in accordance with an embodiment of the present invention.
Description of reference numerals:
1: a reaction tube; 11: a mixed gas inlet; 2: a high pressure separation device; 21: a gas outlet; 22: a liquid outlet; 3: a circulation pipe; 4: a low pressure decomposition device; 41: a gas outlet; 5: a pressure reducing valve; 6: a high pressure circulation pump; 7: decomposing the tube; 8: a booster pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings and the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The hydration separation method of the embodiment is used for performing hydration separation on the mixed gas, wherein the composition of the mixed gas is as follows: 50.4% of methane and 49.6% of nitrogen; the working solution is a tetrahydrofuran aqueous solution with the concentration of 6 percent; as shown in FIG. 1, the hydration separation method comprises the following steps:
1. high pressure hydration reaction
Introducing mixed gas into the working solution to perform high-pressure hydration reaction, wherein the conditions of the high-pressure hydration reaction are as follows: the temperature is 6 ℃, and the absolute pressure is 0.9MPa, so that a high-pressure hydration reaction product is obtained.
2. High pressure separation
And (3) carrying out high-pressure separation on the obtained high-pressure hydration reaction product, wherein the high-pressure separation conditions are as follows: the temperature was 6 ℃ and the absolute pressure was 0.9MPa, whereby a mixed gas containing 47.4% methane (i.e., a residual gas having a composition of 47.4% methane and 52.6% nitrogen) and a mixed liquid containing hydrates were formed.
3. Cyclic high pressure hydration reactions
Conveying a part of the mixed solution formed in the step 2) into the working solution in the step 1) at a speed of 3.8 m/s, and continuing the high-pressure hydration reaction in the step 1), so that the generation of hydration is accelerated, and the separation effect is improved; after the cyclic high-pressure hydration reaction, the volume content of hydrate in the mixed solution is 9 percent.
4. Low pressure decomposition
Simultaneously with the step 3), depressurizing the other part of the mixed liquid formed by the high-pressure separation, and then carrying out low-pressure decomposition under the conditions that: the temperature is 15 ℃, and the absolute pressure is 0.15 MPa; wherein the mass ratio of the part for carrying out the circulating high-pressure hydration reaction to the part for carrying out the low-pressure hydrolysis reaction in the mixed solution formed by the high-pressure separation is 1: 1, forming mixed gas (namely decomposition gas, the composition of which is 63.5 percent of methane and 36.5 percent of nitrogen) containing 63.5 percent of methane and decomposition liquid (namely working fluid).
5. Circulation of digestion liquid
Pressurizing the chemical decomposition liquid to the absolute pressure of 0.9MPa, mixing the chemical decomposition liquid with the mixed liquid, and circularly conveying the mixed liquid to the working liquid/the mixed liquid so as to improve the utilization rate of the working liquid.
Example 2
The hydration separation method of the embodiment is used for performing hydration separation on the mixed gas, wherein the composition of the mixed gas is as follows: 50.4% of methane and 49.6% of nitrogen; the working solution is a tetrahydrofuran aqueous solution with the concentration of 6 percent; the hydration separation method comprises the following steps:
1. high pressure hydration reaction
Introducing mixed gas into the working solution to perform high-pressure hydration reaction, wherein the conditions of the high-pressure hydration reaction are as follows: the temperature is 6 ℃, and the absolute pressure is 0.9MPa, so that a high-pressure hydration reaction product is obtained.
2. High pressure separation
And (3) carrying out high-pressure separation on the obtained high-pressure hydration reaction product, wherein the high-pressure separation conditions are as follows: the temperature was 6 ℃ and the absolute pressure was 0.9MPa, whereby a mixed gas containing 47.2% methane (i.e., a residual gas having a composition of 47.2% methane and 52.8% nitrogen) and a mixed liquid containing hydrates were formed.
3. Cyclic high pressure hydration reactions
Conveying a part of the mixed solution formed in the step 2) into the working solution in the step 1) at a speed of 3.8 m/s, and continuing the high-pressure hydration reaction in the step 1), so that the generation of hydration is accelerated, and the separation effect is improved; after the circulation high-pressure hydration reaction, the content of hydrate in the mixed solution reaches 30 percent.
4. Low pressure decomposition
Simultaneously with the step 3), depressurizing the other part of the mixed liquid formed by the high-pressure separation, and then carrying out low-pressure decomposition under the conditions that: the temperature is 15 ℃, and the absolute pressure is 0.15 MPa; wherein the mass ratio of the part for carrying out the circulating high-pressure hydration reaction to the part for carrying out the low-pressure hydrolysis reaction in the mixed solution formed by the high-pressure separation is 2: 1, forming mixed gas (namely decomposition gas, the composition of which is 63.3 percent of methane and 36.7 percent of nitrogen) containing 63.3 percent of methane and decomposition liquid (namely working fluid).
5. Circulation of digestion liquid
Pressurizing the chemical decomposition liquid to the absolute pressure of 0.9MPa, mixing the chemical decomposition liquid with the mixed liquid, and circularly conveying the mixed liquid to the working liquid/the mixed liquid so as to improve the utilization rate of the working liquid.
Example 3
As shown in figure 2, the hydration separation system of the invention comprises a reaction pipe 1, a high-pressure separation device 2, a circulating pipe 3 and a low pressure decomposition device 4, wherein the inlet end of the reaction pipe 1 is provided with a mixed gas inlet 11, the high-pressure separation device 2 is respectively communicated with the outlet end of the reaction pipe 1 and the inlet end of the circulating pipe 3, the high-pressure separation device 2 is provided with a gas outlet 21 and a liquid outlet 22, the liquid outlet 22 is communicated with the low pressure decomposition device 4 through a pressure reducing valve 5, the outlet end of the circulating pipe 3 is communicated with the inlet end of the reaction pipe 1 through a high-pressure circulating pump 6, and the low pressure decomposition device 4 is provided with a gas outlet.
Further, the hydration separation system also comprises a decomposition pipe 7, a liquid outlet is arranged on the low pressure decomposition device 4, the liquid outlet is communicated with the inlet end of the decomposition pipe 7, and the outlet end of the decomposition pipe 7 is communicated with the outlet end of the circulating pipe 3 through a booster pump 8.
In the hydration separation system, a reaction pipe 1, a high-pressure separation device 2, a circulating pipe 3 and a high-pressure circulating pump 6 jointly form a high-pressure area, and a pressure reducing valve 5, a low-pressure digestion device 4, a digestion pipe 7 and a booster pump 8 jointly form a low-pressure area; the mixed gas contacts with the mixed liquid flowing in the high-pressure area, components which are easy to generate high-pressure hydration reaction in the mixed gas and the working liquid generate hydration reaction and enter a liquid phase, and unhydrated components in the mixed gas become residual gas to be discharged out of the system; meanwhile, the pressure reducing valve 5 can be adjusted according to the treatment capacity to control the liquid amount flowing from the high-pressure separation device 6 to the low-pressure decomposition device 4, the hydrate is decomposed under the low-pressure condition to form decomposed gas and decomposed liquid, the decomposed gas is then discharged out of the system, the decomposed liquid then enters the decomposition pipe 7, is pressurized by the booster pump 8 and then is converged with the mixed liquid from the circulating pipe 3 to enter the high-pressure circulating pump 6, the liquid at the outlet of the high-pressure circulating pump 6 is contacted with the mixed gas in the reaction pipe 1 to generate hydration reaction, then is circulated to the high-pressure separation device 2 to perform high-pressure separation, and the circulation is performed until the mixed gas is completely separated.
The hydration separation device is simple in structure and convenient to operate, can improve the utilization rate of the working solution when the mixed gas is subjected to hydration separation, can reduce the energy consumption of the hydration separation process, and is suitable for large-scale popularization and application.
Comparative example 1
The hydration separation method of the comparative example is used for hydration separation of the mixed gas, wherein the composition of the mixed gas and the working solution are the same as those in example 1; the hydration separation method comprises the following steps:
1. high pressure hydration reaction
Introducing mixed gas into the working solution to perform high-pressure hydration reaction, wherein the conditions of the high-pressure hydration reaction are as follows: the temperature is 6 ℃, and the absolute pressure is 0.9MPa, so that a high-pressure hydration reaction product is obtained.
2. High pressure separation
And (3) carrying out high-pressure separation on the obtained high-pressure hydration reaction product, wherein the high-pressure separation conditions are as follows: the temperature was 6 ℃ and the absolute pressure was 0.9MPa, whereby a mixed gas containing 47.8% of methane (i.e., a residual gas having a composition of 47.8% of methane and 52.2% of nitrogen) and a mixed liquid containing 8.5% of hydrate were formed.
3. Low pressure decomposition
Decompressing the mixed solution formed by the high-pressure separation, and then performing low-pressure decomposition, wherein the conditions of the low-pressure decomposition are as follows: the temperature is 15 ℃, the absolute pressure is 0.15MPa, and a mixed gas (namely a decomposition gas, the composition of which is 63% of methane and 37% of nitrogen) containing 63% of methane and a decomposition liquid (namely a working fluid) are formed.
4. Circulation of digestion liquid
Pressurizing the digestion solution to an absolute pressure of 0.9MPa and then conveying the digestion solution to the working solution.
The results of the above examples and comparative examples illustrate that:
1. the hydration separation method and the system circularly convey part of the mixed solution formed by high-pressure separation to the working solution to continue high-pressure hydration reaction, and the hydrate in the mixed solution greatly shortens the induction period of the high-pressure hydration reaction, thereby improving the speed of the high-pressure hydration reaction and greatly reducing the total separation time.
2. In the hydration separation method and the hydration separation system, the working solution is in multiple circulating contact with the mixed gas, so that the concentration of the hydrate in the mixed solution is greatly improved, the volume content of the hydrate in the mixed solution can reach up to 30 percent, the subsequent treatment capacity of pressure reduction and pressurization can be greatly reduced, and the energy consumption in the hydration separation process is further greatly reduced.
3. The hydration separation method and the hydration separation system circularly convey the mixed liquor at a higher speed, wherein the apparent flow rate of the mixed liquor is more than 2.5 m/s, so that the problems of blockage, wall adhesion and the like caused by hydrates are solved, and the hydration separation process can be continuously and stably carried out.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A hydration separation method, comprising the steps of:
introducing mixed gas to be separated into working liquid in a reaction tube through a mixed gas inlet arranged at the inlet end of the reaction tube to perform high-pressure hydration reaction, introducing a product of the high-pressure hydration reaction into a high-pressure separation device through the outlet end of the reaction tube, and performing high-pressure separation through the high-pressure separation device to form residual gas and mixed liquid containing hydrate;
enabling a part of mixed liquor containing hydrate formed by high-pressure separation to enter an inlet end of a circulating pipe from the high-pressure separation device, enabling the part of the mixed liquor to enter an inlet end of the reaction pipe through a high-pressure circulating pump communicated with an outlet end of the circulating pipe, and circularly conveying a part of the mixed liquor containing hydrate to the working solution in the reaction pipe to continuously carry out high-pressure hydration reaction, wherein the volume content of the hydrate in the circularly conveyed mixed liquor is 10-60%;
decompressing the other part of the mixed solution formed by high-pressure separation, and then carrying out low-pressure decomposition to form decomposed gas and decomposed liquid;
the conditions of the high-pressure hydration reaction and the high-pressure separation are as follows: the temperature is 3-15 ℃, and the absolute pressure is 0.5-20 Mpa;
and controlling the apparent flow velocity of the mixed liquid to be 2.5-3.8 m/s when the mixed liquid is circularly conveyed.
2. The hydration separation method of claim 1, further comprising: and pressurizing the digestion solution, mixing the digestion solution with the mixed solution, and circularly conveying the digestion solution to the working solution.
3. A hydration separation method according to claim 1 or 2, wherein said conditions of low pressure hydrolysis are: the temperature is 3-25 ℃, and the absolute pressure is 0-3 MPa.
4. A hydration separation system for use in the method according to any one of claims 1 to 3, comprising a reaction tube, a high-pressure separation unit, a circulation tube, a high-pressure circulation pump and a low-pressure digestion unit,
wherein the reaction tube, the high-pressure separation device, the circulating tube and the high-pressure circulating pump are sequentially connected,
the inlet end of the reaction tube is provided with a mixed gas inlet,
the outlet end of the reaction tube is connected with the high-pressure separation device, the high-pressure separation device is provided with a gas outlet and a liquid outlet, the liquid outlet is communicated with the low-pressure decomposition device through a pressure reducing valve, the high-pressure separation device is also communicated with the inlet end of the circulating tube and is used for leading part of the mixed liquid containing hydrate to enter the inlet end of the circulating tube from the high-pressure separation device,
the outlet end of the circulating pipe is communicated with the inlet end of the reaction pipe through the high-pressure circulating pump so as to circularly convey a part of the mixed liquid containing the hydrate to the working liquid in the reaction pipe to continue high-pressure hydration reaction,
and the low pressure decomposition device is provided with a gas outlet.
5. The hydration separation system of claim 4, further comprising a decomposition pipe, wherein a liquid outlet is arranged on the low pressure decomposition device, the liquid outlet is communicated with an inlet end of the decomposition pipe, and an outlet end of the decomposition pipe is communicated with an outlet end of the circulation pipe through a booster pump.
6. A hydration separation method, characterized by using the hydration separation system of claim 4 or 5, the hydration separation method comprising the steps of:
introducing mixed gas to be separated into working liquid in a reaction tube through a mixed gas inlet arranged at the inlet end of the reaction tube to perform high-pressure hydration reaction, introducing a product of the high-pressure hydration reaction into a high-pressure separation device through the outlet end of the reaction tube, and performing high-pressure separation through the high-pressure separation device to form residual gas and mixed liquid containing hydrate;
enabling a part of mixed liquor containing hydrate formed by high-pressure separation to enter an inlet end of a circulating pipe from the high-pressure separation device, enabling the part of the mixed liquor to enter an inlet end of the reaction pipe through a high-pressure circulating pump communicated with an outlet end of the circulating pipe, and circularly conveying a part of the mixed liquor containing hydrate to the working solution in the reaction pipe to continuously carry out high-pressure hydration reaction, wherein the volume content of the hydrate in the circularly conveyed mixed liquor is 10-60%;
decompressing the other part of the mixed solution formed by high-pressure separation, and then carrying out low-pressure decomposition to form decomposed gas and decomposed liquid;
the conditions of the high-pressure hydration reaction and the high-pressure separation are as follows: the temperature is 3-15 ℃, and the absolute pressure is 0.5-20 Mpa;
and controlling the apparent flow velocity of the mixed liquid to be 2.5-3.8 m/s when the mixed liquid is circularly conveyed.
7. The hydration separation method of claim 6, further comprising: and pressurizing the digestion solution by a booster pump, and circularly conveying the digestion solution to the reaction tube through a digestion tube.
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| CN1359847A (en) * | 2000-12-20 | 2002-07-24 | 中国科学院广州能源研究所 | Process for recovering hydrogen from hydrogen-containing gas mixture and purifying it |
| CN105498648A (en) * | 2014-09-24 | 2016-04-20 | 中国石油大学(北京) | Hydration reactor, and method therewith for separating methane from coalbed methane-air mixture |
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