CN104003832A - System and technique for simultaneously purifying methane and carbon dioxide from marsh gas - Google Patents
System and technique for simultaneously purifying methane and carbon dioxide from marsh gas Download PDFInfo
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- CN104003832A CN104003832A CN201410219952.2A CN201410219952A CN104003832A CN 104003832 A CN104003832 A CN 104003832A CN 201410219952 A CN201410219952 A CN 201410219952A CN 104003832 A CN104003832 A CN 104003832A
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Abstract
The invention relates to a technique and system for simultaneously purifying methane and carbon dioxide from marsh gas. The technique comprises the following steps: after the marsh gas raw material is compressed and pressurized by a compressor I, entering a pretreatment device I to perform pretreatment; passing through a primary hollow fiber membrane to separate out a CH4 crude product and a CO2 crude product; carrying out deep purification on the CH4 crude product through a secondary hollow fiber membrane, and separating to obtain the CH4 product which satisfies the Vehicle Gas Standard GB18047-2000; and purifying the CO2 crude product with a CO2 recovery device, and separating to obtain the CO2 product which satisfies the Industrial Carbon Dioxide Standard GB/T6052-2011. The technique and system have the characteristics of simple technique, compact equipment structure, small equipment size, high degree of automation, high safety and reliability and wide application range, is convenient to operate, and can implement zero discharge due to the exhaust reflux design.
Description
Technical field
The present invention relates to a kind of apparatus system and technique of the methane and carbon dioxide of simultaneously purifying from biogas, be specifically related to a kind of CH that purifies from biogas
4time reclaim high-purity CO
2device and technique.
Background technology
In current methane purification process section, CO in tail gas
2purity have more than 90%, and tail gas is to be generally directly discharged into atmosphere, a large amount of CO in discharge gas
2with a small amount of CH
4, this part gas purging can affect environment, aggravation Greenhouse effect.
Methane gas is one of important factor affecting Greenhouse effect, and CH4 gas is higher more than 20 times than the actual influence of CO2, must progressively control minimizing.Methane gas only separates and purifies and could effectively be used.And carbonic acid gas also can be produced the industrial chemicals such as dry ice after purifying.
Summary of the invention
The object of the invention is to for present embrane method methane purification technique, in biogas CH4 purify time to CO in the discharge gas of system
2recycle, can realize " zero release " of methane purification system.
The present invention is achieved by the following technical solutions:
Simultaneously purify from the biogas apparatus system of methane and carbon dioxide, comprises marsh gas desulfuration dewaterer, compressor I, pretreatment unit I, first step hollow-fibre membrane, second stage hollow-fibre membrane and CO
2retrieving arrangement; Described marsh gas desulfuration dewaterer is provided with import and outlet; Described compressor I is provided with import and outlet, and described pretreatment unit I is provided with import and outlet; Described first step hollow-fibre membrane is provided with import, impermeable gas outlet and oozes vent outlet; Described second stage hollow-fibre membrane is provided with import, impermeable gas outlet and oozes vent outlet; Described CO
2retrieving arrangement is provided with import, the outlet of purification gas and tail gas outlet; Wherein, the import of described marsh gas desulfuration dewaterer is connected through pipeline with biogas source, and the outlet of described marsh gas desulfuration dewaterer is connected through pipeline with the import of described compressor I; The outlet of described compressor I is connected through pipeline with the import of described pretreatment unit I; The outlet of described pretreatment unit I is connected through pipeline with the import of described first step hollow-fibre membrane; The impermeable gas outlet of described first step hollow-fibre membrane is connected through pipeline with the import of described second stage hollow-fibre membrane, described first step hollow-fibre membrane ooze vent outlet and described CO
2the import of retrieving arrangement connects through pipeline; Described CO
2the tail gas outlet of retrieving arrangement is connected through pipeline with the import of described compressor I, described CO
2the purification gas outlet of retrieving arrangement is CO
2products export; The vent outlet that oozes of described second stage hollow-fibre membrane is connected through pipeline with the import of described compressor I, and the impermeable gas outlet of described second stage hollow-fibre membrane is CH
4products export.
Preferably, described pretreatment unit I comprises cooling driers I, filter set I and well heater I; Described cooling driers I is provided with import and outlet; Described filter set I is provided with import and outlet; Described well heater I is provided with import and outlet; The outlet of described compressor I is connected through pipeline with the import of described cooling driers I; The outlet of described cooling driers I is connected through pipeline with the import of described filter set I; The outlet of described filter set I is connected through pipeline with the import of described well heater I; The outlet of described well heater I is connected through pipeline with the import of described first step hollow-fibre membrane.
Preferably, described apparatus system also comprises compressor II, pretreatment unit II and third stage hollow-fibre membrane; Described compressor II is provided with import and outlet; Described pretreatment unit II is provided with import and outlet; Described third stage hollow-fibre membrane is provided with import, oozes vent outlet and impermeable gas outlet; The vent outlet that oozes of described first step hollow-fibre membrane is connected through pipeline with the import of described compressor II; The outlet of described compressor II is connected through pipeline with the import of described pretreatment unit II; The outlet of described pretreatment unit II is connected through pipeline with the import of described third stage hollow-fibre membrane; Described third stage hollow-fibre membrane ooze vent outlet and described CO
2the import of retrieving arrangement connects through pipeline; The impermeable gas outlet of described third stage hollow-fibre membrane is connected through pipeline with the import of described first step hollow-fibre membrane.
Preferably, described pretreatment unit II comprises cooling driers II, filter set II and well heater II; Described cooling driers II is provided with import and outlet; Described filter set II is provided with import and outlet; Described well heater II is provided with import and outlet; The outlet of described compressor II is connected through pipeline with the import of described cooling driers II; The outlet of described cooling driers II is connected through pipeline with the import of described filter set II; The outlet of described filter set II is connected through pipeline with the import of described well heater II; The outlet of described well heater I is connected through pipeline with the import of described third stage hollow-fibre membrane.
Preferably, described filter set I comprises 4 grades of strainers that are connected in series successively.
Preferably, described filter set II comprises 4 grades of strainers that are connected in series successively.
Preferably, described first step hollow-fibre membrane, second stage hollow-fibre membrane and third stage hollow-fibre membrane comprise respectively multiple hollow fiber film assemblies that are connected in parallel.
Simultaneously purify from the biogas technique of methane and carbon dioxide, comprises the following steps:
(1) from the raw material biogas in biogas source after the processing of marsh gas desulfuration dewaterer, through compressor I compression supercharging, then enter pretreatment unit I and carry out pre-treatment;
(2) then biogas after pretreatment enter first step Middle hollow fiber membrane and go out CH
4crude product and CO
2crude product;
(3) CH going out through first step Middle hollow fiber membrane
4crude product carries out degree of depth purification through second stage hollow-fibre membrane again, and isolated infiltration gas is circulated to compressor I to be continued to process, and isolated impermeable gas is the CH that meets vehicle fuel standard GB18047-2000
4product;
(4) CO going out through first step Middle hollow fiber membrane
2crude product is again through CO
2retrieving arrangement is purified, and isolated tail gas is processed with being circulated to the continuation of compressor I, and isolated purification gas is the CO that meets industrial carbon dioxide standard GB/T6052-2011
2product;
Wherein,
Preferably, the technique of described a kind of methane and carbon dioxide of simultaneously purifying from biogas, comprises the following steps:
(1) from the raw material biogas in biogas source after the processing of marsh gas desulfuration dewaterer, through compressor I compression supercharging, then enter pretreatment unit I and carry out pre-treatment;
(2) then biogas after pretreatment enter first step Middle hollow fiber membrane and go out CH
4crude product and CO
2crude product;
(3) first step Middle hollow fiber membrane goes out CH
4crude product enters the second stage hollow-fibre membrane degree of depth and purifies, and the impermeable gas outlet of second stage hollow-fibre membrane is met the CH of vehicle fuel standard (GB18047-2000)
4, the infiltration gas of second stage hollow-fibre membrane is circulated to compressor I to be continued to process;
(4) first step Middle hollow fiber membrane goes out CO
2crude product is through compressor II supercharging, then after pretreatment unit II processes, enters third stage hollow-fibre membrane;
(5) impermeable gas of third stage hollow-fibre membrane is circulated to first step hollow-fibre membrane continuation processing; The infiltration gas of third stage hollow-fibre membrane enters CO
2retrieving arrangement, CO
2the isolated circulation of tail gas of retrieving arrangement to compressor I continues to process, and isolated purification gas is the CO that meets industrial carbon dioxide standard GB/T6052-2011
2product.
Preferably, the top hole pressure of described compressor I is 0.3-1.6MPa.
Preferably, the top hole pressure of described compressor II is 0.3-1.6MPa.
Preferably, described pretreatment unit I comprises the cooling driers I, filter set I and the well heater I that are connected in series successively.
Preferably, described pretreatment unit II comprises cooling driers II, the filter set II and the well heater II that are connected in series successively.
Preferably, described filter set I comprises 4 grades of strainers that are connected in series, and marsh gas raw materials, through 4 grades of filtrations, reaches following precision: dust 0.01 μ m/Nm3, and Residual oil 0.01mg/Nm3, ammonia or amine are less than 100ppm, H
2s is less than 15ppm.
Preferably, described well heater I Outlet Gas Temperature is 25～50 DEG C.
Preferably, described filter set II comprises 4 grades of strainers that are connected in series, and described first step Middle hollow fiber membrane goes out CO
2crude product, through 4 grades of filtrations, reaches following precision: dust 0.01 μ m/Nm3, and Residual oil 0.01mg/Nm3, ammonia or amine are less than 100ppm, H
2s is less than 15ppm.
Preferably, the Outlet Gas Temperature of described well heater II is 25～50 DEG C.
Preferably, described first step hollow-fibre membrane, second stage hollow-fibre membrane and third stage hollow-fibre membrane comprise respectively multiple hollow fiber film assemblies that are connected in parallel.
Technique effect of the present invention and advantage are:
Purifying technique of the present invention can obtain CO
2and CH
4two kinds of highly purified gas products, utilize the energy fully, prevent from causing in exhaust emissions atmosphere environmental pollution and Greenhouse effect; Owing to having used embrane method purifying technique, technique is simple, compact equipment, equipment volume are little, and level of automation is high, easy to operate, safe and reliable, applied range.In technique of the present invention and device, the tail gas reflux technique of design, realizes " zero release " of system.
Brief description of the drawings
The apparatus system (two-stage membrane sepn) of a kind of methane and carbon dioxide of simultaneously purifying from biogas of Fig. 1
The apparatus system (three grades of membrane sepn) of a kind of methane and carbon dioxide of simultaneously purifying from biogas of Fig. 2
Fig. 3 pretreatment unit I structural representation
Fig. 4 hollow fiber film structure schematic diagram
Reference numeral:
1, marsh gas desulfuration dewaterer; 2, compressor I; 3, pretreatment unit I; 4, first step hollow-fibre membrane; 5, second stage hollow-fibre membrane; 6, CH
4storage tank; 7, CO
2retrieving arrangement; 8, compressor II; 9, pretreatment unit II; 10, third stage hollow-fibre membrane; 11, cooling driers I; 12, filter set I; 13, well heater I; 14, hollow fiber film assembly.
Embodiment
By specific specific examples, technical scheme of the present invention is described below.Should be understood that one or more method stepss that the present invention mentions do not repel between the step that also has additive method step or clearly mention at these before and after described combination step can also insert additive method step; Should also be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.And, except as otherwise noted, the numbering of various method steps is only for differentiating the convenient tool of various method steps, but not for limiting the ordering of various method steps or limiting the enforceable scope of the present invention, the change of its relativeness or adjustment, in the situation that changing technology contents without essence, when being also considered as the enforceable category of the present invention.
Simultaneously purify from the biogas apparatus system of methane and carbon dioxide, as shown in Figure 1, comprises marsh gas desulfuration dewaterer 1, compressor I 2, pretreatment unit I 3, first step hollow-fibre membrane 4, second stage hollow-fibre membrane 5 and CO
2retrieving arrangement 7; Described marsh gas desulfuration dewaterer 1 is provided with import and outlet; Described compressor I 2 is provided with import and outlet, and described pretreatment unit I 3 is provided with import and outlet; Described first step hollow-fibre membrane 4 is provided with import, impermeable gas outlet and oozes vent outlet; Described second stage hollow-fibre membrane 5 is provided with import, impermeable gas outlet and oozes vent outlet; Described CO
2retrieving arrangement 7 is provided with import, the outlet of purification gas and tail gas outlet; Wherein, the import of described marsh gas desulfuration dewaterer 1 is connected through pipeline with biogas source, and the outlet of described marsh gas desulfuration dewaterer 1 is connected through pipeline with the import of described compressor I 2; The outlet of described compressor I 2 is connected through pipeline with the import of described pretreatment unit I 3; The outlet of described pretreatment unit I 3 is connected through pipeline with the import of described first step hollow-fibre membrane 4; The impermeable gas outlet of described first step hollow-fibre membrane 4 is connected through pipeline with the import of described second stage hollow-fibre membrane 5, described first step hollow-fibre membrane 4 ooze vent outlet and described CO
2the import of retrieving arrangement 7 connects through pipeline; Described CO
2the tail gas outlet of retrieving arrangement 7 is connected through pipeline with the import of described compressor I 2, described CO
2the purification gas outlet of retrieving arrangement 7 is CO
2products export; The vent outlet that oozes of described second stage hollow-fibre membrane 5 is connected through pipeline with described compressor I 2 imports, and the impermeable gas outlet of described second stage hollow-fibre membrane 5 is CH
4products export.
Under preferable case, as shown in Figure 3:
Described pretreatment unit I 3 comprises cooling driers I 11, filter set I 12 and well heater I 13; Described cooling driers I 11 is provided with import and outlet; Described filter set I 12 is provided with import and outlet; Described well heater I 13 is provided with import and outlet; The outlet of described compressor I 2 is connected through pipeline with the import of described cooling driers I 11; The outlet of described cooling driers I 11 is connected through pipeline with the import of described filter set I 12; The outlet of described filter set I 12 is connected through pipeline with the import of described well heater I 13; The outlet of described well heater I 13 is connected through pipeline with the import of described first step hollow-fibre membrane 4.
Described filter set I 12 comprises 4 grades of strainers that are connected in series successively.
Under another preferable case, as shown in Figure 2:
Described apparatus system also comprises compressor II8, pretreatment unit II9 and third stage hollow-fibre membrane 10; Described compressor II8 is provided with import and outlet; Described pretreatment unit II9 is provided with import and outlet; Described third stage hollow-fibre membrane 10 is provided with import, oozes vent outlet and impermeable gas outlet; The vent outlet that oozes of described first step hollow-fibre membrane 4 is connected through pipeline with the import of described compressor II8; The outlet of described compressor II8 is connected through pipeline with the import of described pretreatment unit II9; The outlet of described pretreatment unit II9 is connected through pipeline with the import of described third stage hollow-fibre membrane 10; Described third stage hollow-fibre membrane 10 ooze vent outlet and described CO
2the import of retrieving arrangement 7 connects through pipeline; The impermeable gas outlet of described third stage hollow-fibre membrane 10 is connected through pipeline with the import of described first step hollow-fibre membrane 4.
Described pretreatment unit II9 comprises cooling driers II, filter set II and well heater II; Described cooling driers II is provided with import and outlet; Described filter set II is provided with import and outlet; Described well heater II is provided with import and outlet; The outlet of described compressor II8 is connected through pipeline with the import of described cooling driers II; The outlet of described cooling driers II is connected through pipeline with the import of described filter set II; The outlet of described filter set II is connected through pipeline with the import of described well heater II; The outlet of described well heater I 13 is connected through pipeline with the import of described third stage hollow-fibre membrane 10.
Described filter set II comprises 4 grades of strainers that are connected in series successively.
Under another preferable case: as shown in Figure 4, described first step hollow-fibre membrane 4, second stage hollow-fibre membrane 5 and third stage hollow-fibre membrane 10 comprise respectively multiple hollow fiber film assemblies that are connected in parallel 14.
Embodiment 1: two-stage membrane separation process
Simultaneously purify from the biogas technique of methane and carbon dioxide, comprises the following steps:
(1) marsh gas raw materials carries out after desulfurization dewatering through marsh gas desulfuration dewaterer 1, be pressurized to after 1.35MPa through 2 compressions of compressor I, enter pretreatment unit I, process through cooling driers I, filter set I (comprising 4 grades of strainers that are connected in series), filtering accuracy reaches dust 0.01 μ m/Nm3, Residual oil 0.01mg/Nm3, ammonia or amine are less than 100ppm, H
2s is less than 15ppm, then passes through well heater I, and temperature reaches 35 DEG C, enters first step hollow-fibre membrane 4 and carries out CO
2and CH
4roughing out;
(2) obtain CO at the vent outlet that oozes of first step hollow-fibre membrane 4
2crude product (94% CO
2, the CH of 4v%
4, other are O
2, N
2deng), impermeable gas exports the CH obtaining
4crude product enters second stage hollow-fibre membrane 5 degree of depth and purifies;
(3) second stage hollow-fibre membrane 5 permeates after gas exit gas mixes with the raw material biogas after desulfurization dewatering and enters the 2 continuation processing of compressor I, and hollow-fibre membrane 5 impermeable gas outlets in the second stage obtain CH
4product, purity reaches more than 97%, meets vehicle fuel GB18047-2000 standard;
(4) the isolated CO of first step hollow-fibre membrane 4
2crude product is again through CO
2retrieving arrangement 7 carries out low temperature purification, enters compressor I 2 and continues to process, isolated CO after isolated backflow gas mixes with marsh gas raw materials
2purity reaches 99.9%, meets the product requirement of industrial carbon dioxide standard GB/T6052-2011.
2: three grades of membrane separation processes of embodiment
(1) marsh gas raw materials carries out after desulfurization dewatering through marsh gas desulfuration dewaterer 1, be pressurized to after 1.0MPa through 2 compressions of compressor I, then enter pretreatment unit I 3, after the pre-treatment of cooling driers I 11, filter set I 12 (comprising 4 grades of strainers that are connected in series) and well heater I 13, filtering accuracy reaches dust 0.01 μ m/Nm3, Residual oil 0.01mg/Nm3, ammonia or amine are less than 100ppm, H
2s is less than 15ppm, and temperature reaches 40 DEG C, then enters first step hollow-fibre membrane 4 and carries out CO
2and CH
4roughing out;
(2) obtain CO at the vent outlet that oozes of first step hollow-fibre membrane 4
2crude product (the CO of 90v%
2, the CH4 of 8v%, other are O
2, N
2deng), through compressor II8, be compressed to 1.1MPa, enter pretreatment unit II9, after the pre-treatment of cooling driers II, filter set II (comprising 4 grades of strainers that are connected in series) and well heater II, filtering accuracy reaches dust 0.01 μ m/Nm3, Residual oil 0.01mg/Nm3, ammonia or amine are less than 100ppm, H
2s is less than 15ppm, and temperature reaches 40 DEG C, then enters third stage hollow-fibre membrane 10; The impermeable gas of first step hollow-fibre membrane 4 exports the CH obtaining
4crude product enters second stage hollow-fibre membrane 5 degree of depth and purifies;
(3) outlet of the impermeable gas of second stage hollow-fibre membrane 5 obtains CH
4product, purity reaches more than 97%, meets vehicle fuel GB18047-2000 standard;
(4) the infiltration gas of second stage hollow-fibre membrane 5 and the raw material biogas of desulfurization dewatering are mixed into the 2 continuation processing of compressor I;
(5) the infiltration gas (98v%CO of third stage hollow-fibre membrane 10
2, 0.7v%CH
4, other O
2, N
2deng), through CO
2retrieving arrangement 7 carries out low temperature purification, and isolated tail gas is processed be recycled to 2 continuation of compressor I after the raw material biogas of desulfurization dewatering mixes, isolated CO
2purity reaches 99.9%, meets industrial carbon dioxide GB/T6052-2011 standard;
(6) impermeable gas of third stage hollow-fibre membrane 10, is circulated to the import of first step hollow-fibre membrane 4, mixes with pretreated gas in step (1), then enters first step hollow-fibre membrane 4 and continues to purify.
Claims (10)
1. the apparatus system of methane and carbon dioxide of simultaneously purifying from biogas, it is characterized in that, comprise marsh gas desulfuration dewaterer (1), compressor I (2), pretreatment unit I (3), first step hollow-fibre membrane (4), second stage hollow-fibre membrane (5) and CO
2retrieving arrangement (7); Described marsh gas desulfuration dewaterer (1) is provided with import and outlet; Described compressor I (2) is provided with import and outlet, and described pretreatment unit I (3) is provided with import and outlet; Described first step hollow-fibre membrane (4) is provided with import, impermeable gas outlet and oozes vent outlet; Described second stage hollow-fibre membrane (5) is provided with import, impermeable gas outlet and oozes vent outlet; Described CO
2retrieving arrangement (7) is provided with import, the outlet of purification gas and tail gas outlet; Wherein, the import of described marsh gas desulfuration dewaterer (1) is connected through pipeline with biogas source, and the outlet of described marsh gas desulfuration dewaterer (1) is connected through pipeline with the import of described compressor I (2); The outlet of described compressor I (2) is connected through pipeline with the import of described pretreatment unit I (3); The outlet of described pretreatment unit I (3) is connected through pipeline with the import of described first step hollow-fibre membrane (4); The impermeable gas outlet of described first step hollow-fibre membrane (4) is connected through pipeline with the import of described second stage hollow-fibre membrane (5), described first step hollow-fibre membrane (4) ooze vent outlet and described CO
2the import of retrieving arrangement (7) connects through pipeline; Described CO
2the tail gas outlet of retrieving arrangement (7) is connected through pipeline with the import of described compressor I (2), described CO
2the purification gas outlet of retrieving arrangement (7) is CO
2products export; The vent outlet that oozes of described second stage hollow-fibre membrane (5) is connected through pipeline with described compressor I (2) import, and the impermeable gas outlet of described second stage hollow-fibre membrane (5) is CH
4products export.
2. the apparatus system of a kind of methane and carbon dioxide of simultaneously purifying from biogas as claimed in claim 1, it is characterized in that, described apparatus system also comprises compressor II (8), pretreatment unit II (9) and third stage hollow-fibre membrane (10); Described compressor II (8) is provided with import and outlet; Described pretreatment unit II (9) is provided with import and outlet; Described third stage hollow-fibre membrane (10) is provided with import, oozes vent outlet and impermeable gas outlet; The vent outlet that oozes of described first step hollow-fibre membrane (4) is connected through pipeline with the import of described compressor II (8); The outlet of described compressor II (8) is connected through pipeline with the import of described pretreatment unit II (9); The outlet of described pretreatment unit II (9) is connected through pipeline with the import of described third stage hollow-fibre membrane (10); Described third stage hollow-fibre membrane (10) ooze vent outlet and described CO
2the import of retrieving arrangement (7) connects through pipeline; The impermeable gas outlet of described third stage hollow-fibre membrane (10) is connected through pipeline with the import of described first step hollow-fibre membrane (4).
3. the apparatus system of a kind of methane and carbon dioxide of simultaneously purifying from biogas as claimed in claim 2, it is characterized in that, described pretreatment unit I (3) comprises cooling driers I (11), filter set I (12) and well heater I (13); Described cooling driers I (11) is provided with import and outlet; Described filter set I (12) is provided with import and outlet; Described well heater I (13) is provided with import and outlet; The outlet of described compressor I (2) is connected through pipeline with the import of described cooling driers I (11); The outlet of described cooling driers I (11) is connected through pipeline with the import of described filter set I (12); The outlet of described filter set I (12) is connected through pipeline with the import of described well heater I (13); The outlet of described well heater I (13) is connected through pipeline with the import of described first step hollow-fibre membrane (4);
Described pretreatment unit II (9) comprises cooling driers II, filter set II and well heater II; Described cooling driers II is provided with import and outlet; Described filter set II is provided with import and outlet; Described well heater II is provided with import and outlet; The outlet of described compressor II (8) is connected through pipeline with the import of described cooling driers II; The outlet of described cooling driers II is connected through pipeline with the import of described filter set II; The outlet of described filter set II is connected through pipeline with the import of described well heater II; The outlet of described well heater I (13) is connected through pipeline with the import of described third stage hollow-fibre membrane (10).
4. simultaneously purify from the biogas technique of methane and carbon dioxide, comprises the following steps;
(1) from the raw material biogas in biogas source after the processing of marsh gas desulfuration dewaterer (1), through compressor I (2) compression supercharging, then enter pretreatment unit and carry out pre-treatment;
(2) then biogas after pretreatment enter first step hollow-fibre membrane (4) and isolate CH
4crude product and CO
2crude product;
(3) through the isolated CH of first step hollow-fibre membrane (4)
4crude product carries out degree of depth purification through second stage hollow-fibre membrane (5) again, and isolated infiltration gas is circulated to compressor I (2) to be continued to process, and isolated impermeable gas is the CH that meets vehicle fuel standard GB18047-2000
4product;
(4) through the isolated CO of first step hollow-fibre membrane (4)
2crude product is again through CO
2retrieving arrangement (7) is purified, and isolated tail gas is processed with being circulated to compressor I (2) continuation, and isolated purification gas is the CO that meets industrial carbon dioxide standard GB/T6052-2011
2product.
5. the technique of a kind of methane and carbon dioxide of simultaneously purifying from biogas as claimed in claim 4, is characterized in that, comprises the following steps:
(1) from the raw material biogas in biogas source after the processing of marsh gas desulfuration dewaterer (1), through compressor I (2) compression supercharging, then enter pretreatment unit I (3) and carry out pre-treatment;
(2) then biogas after pretreatment enter first step hollow-fibre membrane (4) and isolate CH
4crude product and CO
2crude product;
(3) first step hollow-fibre membrane (4) is isolated CH
4crude product enters second stage hollow-fibre membrane (5) degree of depth and purifies, and the impermeable gas outlet of second stage hollow-fibre membrane (5) is met the CH of vehicle fuel standard (GB18047-2000)
4, the infiltration gas of second stage hollow-fibre membrane (5) is circulated to compressor I (2) to be continued to process;
(4) first step hollow-fibre membrane (4) is isolated CO
2crude product is through compressor II (8) supercharging, then after pretreatment unit II (9) processes, enters third stage hollow-fibre membrane (10);
(5) impermeable gas of third stage hollow-fibre membrane (10) is circulated to first step hollow-fibre membrane (4) continuation processing; The infiltration gas of third stage hollow-fibre membrane (10) enters CO
2retrieving arrangement (7), CO
2the isolated circulation of tail gas of retrieving arrangement (7) to compressor I (2) continues to process, and isolated purification gas is the CO that meets industrial carbon dioxide standard GB/T6052-2011
2product.
6. the technique of a kind of methane and carbon dioxide of simultaneously purifying from biogas as described in claim 4 or 5, is characterized in that, the top hole pressure of described compressor I (2) is 0.3-1.6MPa; The top hole pressure of described compressor II (8) is 0.3-1.6MPa.
7. the technique of a kind of methane and carbon dioxide of simultaneously purifying from biogas as described in claim 4 or 5, it is characterized in that, described pretreatment unit I (3) comprises the cooling driers I (11), filter set I (12) and the well heater I (13) that are connected in series successively; Described pretreatment unit II (9) comprises cooling driers II, the filter set II and the well heater II that are connected in series successively.
8. the technique of a kind of methane and carbon dioxide of simultaneously purifying from biogas as claimed in claim 7, it is characterized in that, described filter set I (12) comprises 4 grades of strainers that are connected in series, marsh gas raw materials is through 4 grades of filtrations, reach following precision: dust 0.01 μ m/Nm3, Residual oil 0.01mg/Nm3, ammonia or amine are less than 100ppm, H
2s is less than 15ppm; Well heater I (13) Outlet Gas Temperature is 25～50 DEG C.
9. the technique of a kind of methane and carbon dioxide of simultaneously purifying from biogas as claimed in claim 7, is characterized in that, described filter set II comprises 4 grades of strainers that are connected in series, and described first step hollow-fibre membrane (4) is isolated CO
2crude product, through 4 grades of filtrations, reaches following precision: dust 0.01 μ m/Nm3, and Residual oil 0.01mg/Nm3, ammonia or amine are less than 100ppm, H
2s is less than 15ppm; The Outlet Gas Temperature of described well heater II is 25～50 DEG C.
10. the technique of a kind of methane and carbon dioxide of simultaneously purifying from biogas as described in claim 4 or 5, it is characterized in that, described first step hollow-fibre membrane (4), second stage hollow-fibre membrane (5) and third stage hollow-fibre membrane (10) comprise respectively multiple hollow fiber film assemblies that are connected in parallel (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410219952.2A CN104003832B (en) | 2014-05-22 | 2014-05-22 | A kind ofly to purify the apparatus system of methane and carbon dioxide and technique from biogas simultaneously |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410219952.2A CN104003832B (en) | 2014-05-22 | 2014-05-22 | A kind ofly to purify the apparatus system of methane and carbon dioxide and technique from biogas simultaneously |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104003832A true CN104003832A (en) | 2014-08-27 |
| CN104003832B CN104003832B (en) | 2015-11-04 |
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Cited By (4)
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| CN106497760A (en) * | 2016-12-03 | 2017-03-15 | 上海垣锦机电设备制造有限公司 | Biogas membrance separation purifying plant |
| CN109381972A (en) * | 2017-08-03 | 2019-02-26 | 天津大学 | A kind of method of Matter Transfer cascade membrane separating carbon dioxide in flue gas |
| CN110617039A (en) * | 2019-10-17 | 2019-12-27 | 陕西延长石油(集团)有限责任公司研究院 | Method for recycling carbon dioxide of associated gas of carbon dioxide flooding of low-yield oil field |
| EP4349455A1 (en) | 2022-10-06 | 2024-04-10 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Improved integrated system and method for methane production using off gas recycling to anaerobic digester from a gas separation membrane unit |
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| CN102329672A (en) * | 2011-09-06 | 2012-01-25 | 北京昊业怡生科技有限公司 | Method for separating and producing methane and carbon dioxide from marsh gas |
| CN203890266U (en) * | 2014-05-22 | 2014-10-22 | 上海精腾新能源科技有限公司 | Device system for simultaneously purifying methane and carbon dioxide from biogas |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106497760A (en) * | 2016-12-03 | 2017-03-15 | 上海垣锦机电设备制造有限公司 | Biogas membrance separation purifying plant |
| CN106497760B (en) * | 2016-12-03 | 2019-07-02 | 上海垣锦机电设备制造有限公司 | Biogas UF membrane purifying plant |
| CN109381972A (en) * | 2017-08-03 | 2019-02-26 | 天津大学 | A kind of method of Matter Transfer cascade membrane separating carbon dioxide in flue gas |
| CN110617039A (en) * | 2019-10-17 | 2019-12-27 | 陕西延长石油(集团)有限责任公司研究院 | Method for recycling carbon dioxide of associated gas of carbon dioxide flooding of low-yield oil field |
| EP4349455A1 (en) | 2022-10-06 | 2024-04-10 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Improved integrated system and method for methane production using off gas recycling to anaerobic digester from a gas separation membrane unit |
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