CN103013607A - Method for extracting pure methane and carbon dioxide from biogas impurities and specialized device thereof - Google Patents
Method for extracting pure methane and carbon dioxide from biogas impurities and specialized device thereof Download PDFInfo
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- CN103013607A CN103013607A CN2013100060506A CN201310006050A CN103013607A CN 103013607 A CN103013607 A CN 103013607A CN 2013100060506 A CN2013100060506 A CN 2013100060506A CN 201310006050 A CN201310006050 A CN 201310006050A CN 103013607 A CN103013607 A CN 103013607A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a method for extracting pure methane and carbon dioxide from biogas impurities, and the method comprises the following steps: 1) cleaning before extracting the methane and the carbon dioxide; 2) setting a separation chamber, preparing a methane gas bottle and a carbon dioxide gas bottle, pumping the separation chamber, the methane gas bottle and the carbon dioxide gas bottle by a vacuum pump; 3) cooling the separation chamber; 4) inputting the biogas from which hydrogen sulfide and steam have been removed into the separation chamber, and coagulating the biogas to turn to be solid; 5) heating the separation chamber to room temperature, ensuring that the pure methane is at the top of the separation chamber and the pure carbon dioxide is at the bottom, and forming a thin intermediate zone between the pure methane and the pure carbon dioxide, which is a mixture of the methane gas and the carbon dioxide gas; and 6) respectively filling the pure methane at the top of the separation chamber and the pure carbon dioxide at the bottom into the bottles. The invention also discloses a specialized device. By adopting the technical scheme disclosed by the invention, the element accumulation efficiency of the biogas can be increased and the element with high purity can be extracted.
Description
Technical field
The present invention relates to the gaseous mixture separation technology field, is the method for purifying methane and carbon dioxide and the technology of isolated plant thereof extracted from biogas impurity specifically.
Background technology
In the prior art, the method of extracting the purifying methane and carbon dioxide from biogas impurity generally is at lower biogas compositional classification of a constant temp, wherein the purifying methane and carbon dioxide namely refers to pure methane and pure carbonic acid gas, this method is the separation and Extraction composition at room temperature, and then use, such as United States Patent (USP), its patent No. 4581044, classification number is BO1D53/04, time is 1986, and this separation method needs to carry out under constant temperature, if surpass 300K, wherein K is the open type temperature, then needs specific sorbent material.Yet this its technology content of known separation method is lower because the regeneration that its enforcement must be used advanced equipments and subsequently sorbent material with separate, this process is very very long.In addition, because when the divided gas flow composition, air pressure is low, therefore the efficient of accumulation is very low.In addition, known method is being separated and is being gathered into the pressure that timesharing need to be certain, and its pressure causes the lower concentration can amount of these compositions greater than normal atmosphere, has inefficient problem.
In the prior art, extracting the other method of purifying methane and carbon dioxide from biogas impurity is that condensation biogas becomes solid-state, and condensation biogas is heated to room temp, also comprises the composition that separates in the biogas, patent such as Ukraine, its patent No. 10307A, classification number are BO1B53/00, and the time is 1996, this method is first methane to be separated, then heat when reaching the fusing point of carbonic acid gas, again carbonic acid gas is separated, biogas can be separated into methane and carbon dioxide like this.Therefore this method exists the low problem of biogas composition cumulative efficiency equally owing to be sequentially to carry out by front and back when extracting, and purity also is difficult to improve, and namely is difficult to obtain highly purified methane and carbon dioxide.
Summary of the invention
The purpose of this invention is to provide a kind of method and isolated plant thereof that from biogas impurity, extracts the purifying methane and carbon dioxide, can improve biogas composition cumulative efficiency, improve the dna purity of composition.
The present invention is achieved through the following technical solutions.
A kind of method of extracting the purifying methane and carbon dioxide from biogas impurity comprises the following steps:
1) before extracting methane and carbon dioxide, biogas is purified, remove impurity hydrogen sulfide and water vapour;
2) separate chamber is set, is ready to methane gas cylinder and dioxide bottle, with pumping equipment separate chamber, methane gas cylinder and dioxide bottle are aspirated, make the pressure in methane gas cylinder, dioxide bottle and the separate chamber all be less than 10 handkerchiefs;
3) separate chamber is cooled off;
4) removed the biogas of impurity hydrogen sulfide and water vapour and in the separate chamber, condensed into solid-state to separate chamber's input;
5) separate chamber is heated to room temperature, making the top, separate chamber is pure methane, and the bottom is pure carbon dioxide, forms very thin intermediate zone between them, is the mixture of the gas of methane and carbon dioxide;
6) pure methane at top, separate chamber is packed in the methane gas cylinder, the pure carbon dioxide of bottom, separate chamber is packed in the dioxide bottle, when the amount of each composition is near prescribed value in methane gas cylinder and the dioxide bottle, separation stops, stay the mixed gas in the separate chamber, will do lower whorl and extract the methane and carbon dioxide use.
Hydrogen sulfide impurities in the described biogas should can't detect, and water vapour content should be less than 0.001%.
Described separate chamber is positioned in the vacuum jacketed flask, fills with the cooling liquid nitrogen in vacuum jacketed flask, makes separate chamber's temperature be cooled to 100K.
The pressure of separate chamber is lower than 15 MPas in the described step 5).
A kind of device that from biogas impurity, extracts the purifying methane and carbon dioxide, it is characterized in that: the described device that extracts the purifying methane and carbon dioxide from biogas impurity comprises vacuum jacketed flask, the separate chamber, the methane gas cylinder, dioxide bottle and pipeline, the pipeline front end is provided with inlet valve, the rear end is provided with outlet valve and vacuum pressure gauge, the separate chamber is placed in the vacuum jacketed flask, the separate chamber also is equipped with heating unit, the separate chamber is connected to the inlet valve of pipeline and the line segments between the outlet valve, be provided with the 3rd air valve between separate chamber and the pipeline, the methane gas cylinder is connected with methane and advances a bottle pipeline, advance a bottle pipeline at methane and be provided with the first air valve, dioxide bottle is connected with carbonic acid gas and advances a bottle pipeline, advance a bottle pipeline at carbonic acid gas and be provided with the second air valve, methane advances bottle pipeline and is communicated with the bottom of separate chamber, carbonic acid gas advances bottle pipeline and is communicated with the top of separate chamber, is leading to the separate chamber, the methane gas cylinder, also be respectively equipped with the pressure warning unit of using for adjustable pressure on the pipeline of dioxide bottle.
Described carbonic acid gas advances bottle pipeline and is connected with pipeline, the methane gas cylinder also is connected with pipeline, be provided with the 5th air valve between methane gas cylinder and the pipeline, the weather gage of display bottle internal pressure all is installed on methane gas cylinder, the dioxide bottle, rear end of pipeline is connected with vacuum extractor, and outlet valve is located at before the vacuum extractor.
Described separate chamber also adds thermocouple assembly.
The present invention compared with prior art has the following advantages.
By method of the present invention and isolated plant thereof, so that from biogas impurity, extract the method that the purifying methane and carbon dioxide is pure methane and pure carbonic acid gas, adopted new execution sequence, thereby improved biogas composition cumulative efficiency.Solved the problem that solid-state biogas condensation is warmed to room temp.By structure of the present invention, implementation be that composition separates simultaneously, so the efficient of composition accumulation can reach maximum.In addition, can extract highly purified composition, each biogas component separating quantity is no more than 0.8 V C, constituent concentration in the V-biogas condensation volume, C-biogas.Because when solid-state biogas is heated to room temperature, because the steam elasticity of methane and carbon dioxide there are differences, carrying out biogas in forming the scrubbed gas composition of separating interface separates, separate the pressure of biogas by tens Atmospheric compositions, higher for the known method possibility of next step separation collection high concentrations of gas volume ratio like this, for the composition accumulation provides higher efficient, and, when composition separates simultaneously, the phenomenon that gas mixes and container fills up when high pressure can not appear: on the one hand, guarantee the high-level efficiency accumulation; Accumulate on the other hand the high purity composition.If no more than 0.8 VC of each component separating quantity of biogas, the situation of then mixing is can not occur, and this has also determined the high purity of accumulation composition.
Description of drawings
Fig. 1 is the present invention extracts the method for purifying methane and carbon dioxide from biogas impurity isolated plant structural representation.
Embodiment
A kind of method of extracting the purifying methane and carbon dioxide from biogas impurity comprises the following steps:
1) clearing up before extracting methane and carbon dioxide, namely is that biogas is purified, and removes impurity hydrogen sulfide and water vapour;
2) separate chamber is set, is ready to methane gas cylinder and dioxide bottle, with vacuum pump separate chamber, methane gas cylinder and dioxide bottle are aspirated, make the pressure in methane gas cylinder, dioxide bottle and the separate chamber all be less than 10 handkerchiefs;
3) separate chamber is cooled off;
4) removed the biogas of impurity hydrogen sulfide and water vapour and in the separate chamber, condensed into solid-state to separate chamber's input;
5) separate chamber is heated to room temperature, the pressure of separate chamber is lower than 15 MPas, and making the top, separate chamber is pure methane, and the bottom is pure carbon dioxide, forms very thin intermediate zone between them, is the mixture of the gas of methane and carbon dioxide;
6) pure methane at top, separate chamber is packed in the methane gas cylinder, the pure carbon dioxide of bottom, separate chamber is packed in the dioxide bottle, when the amount of each composition is near prescribed value in methane gas cylinder and the dioxide bottle, separated component stops, stay the mixed gas in the separate chamber, will do lower whorl and extract the methane and carbon dioxide use.
Wherein the hydrogen sulfide impurities in the biogas should can't detect, and water vapour content should be less than 0.001%.The separate chamber is positioned in the vacuum jacketed flask, fills with the cooling liquid nitrogen in vacuum jacketed flask, makes separate chamber's temperature be cooled to 100K.
Below in conjunction with accompanying drawing the present invention extracts the purifying methane and carbon dioxide from biogas impurity device is described in further detail.
As shown in Figure 1, the present invention extracts the purifying methane and carbon dioxide from biogas impurity device comprises vacuum jacketed flask 2, separate chamber 2, methane gas cylinder 3, dioxide bottle 4 and pipeline 9, pipeline 9 front ends are provided with import inlet valve 14, the rear end is provided with outlet valve 10 and vacuum pressure gauge 17, separate chamber 2 is placed in the vacuum jacketed flask 2, separate chamber 2 also is equipped with heating unit, separate chamber 2 is connected to the import inlet valve 14 of pipeline 9 and the line segments between the outlet valve 10, be provided with the 3rd air valve 7 between separate chamber 2 and the pipeline 9, methane gas cylinder 3 is connected with methane and advances a bottle pipeline, advance a bottle pipeline at methane and be provided with the first air valve 5, dioxide bottle 4 is connected with carbonic acid gas and advances a bottle pipeline, advance a bottle pipeline at carbonic acid gas and be provided with the second air valve 6, methane advances bottle pipeline and is communicated with the bottom of separate chamber 2, carbonic acid gas advances bottle pipeline and is communicated with the top of separate chamber 2, is leading to separate chamber 2, methane gas cylinder 3, also be respectively equipped with the pressure warning unit 13 of using for adjustable pressure on the pipeline of dioxide bottle 4, pressure warning unit 8, pressure warning unit 12.Carbonic acid gas advances bottle pipeline and is connected with pipeline 9, and methane gas cylinder 3 also is connected with pipeline 9, is provided with the 5th air valve 11 between methane gas cylinder 3 and the pipeline 9.Weather gage 15, the weather gage 16 of display bottle internal pressure all are installed on methane gas cylinder 3, dioxide bottle 4.Be connected with vacuum extractor in pipeline 9 rear ends, outlet valve 10 is located at before the vacuum extractor.Separate chamber 2 also adds thermocouple assembly.
Implementation method is as follows: before biogas extracts separation inlet valve 14 cuts out, the first air valve 5, the second air valve 6, the 3rd air valve 7, the 5th air valve 11 and outlet valve 10 are opened, with vacuum pump (not marking on the figure) suction channel 9, pressure in methane gas cylinder 3, dioxide bottle 4 and the separate chamber 2 is less than 10 handkerchiefs, is monitored by vacuum pressure gauge 17.Afterwards the first air valve 5, the second air valve 6, the 3rd air valve 7, the 5th air valve 11 and outlet valve 10 are closed, vacuum jacketed flask 2 usefulness cooling liquid nitrogen is filled, and separate chamber's 2 temperature are cooled to 100K.Open afterwards inlet valve 14, the 3rd air valve 7, the biogas of having removed impurity hydrogen sulfide and water vapour condenses into solid-state in separate chamber 2.The quantity of condensation biogas is controlled by biogas meter.Close inlet valve inlet valve 14 and the 3rd air valve 7 after the biogas condensation, remove vacuum jacketed flask 2, to separate chamber's 2 heating, control temperature by thermopair, and the pressure in the separate chamber 2 is regulated by pressure warning unit 13.Because the biogas of condensation is heated to room temperature, under the pressure that is lower than 15 MPas, be full of methane and carbon dioxide in the separate chamber 2, this moment, 2 tops were pure methane in the separate chamber, the bottom is pure carbon dioxide, then form very thin intermediate zone between them, be mixture namely for methane and the carbonic acid gas of gas.If separated component then open the 3rd air valve 7, the second air valve 6 and the first air valve 5, methane gas cylinder 3 is filled methane, dioxide bottle 4 filling arbon dioxides like this.Weather gage 15, weather gage 16 are measured the amount of gas of separating.When the amount of each composition during near prescribed value, separated component stops, and closes the 3rd air valve 7, the second air valve 6 and the first air valve 5.Stay the mixed gas in the separate chamber 2, will do lower whorl and extract the methane and carbon dioxide use.
The below is the result who obtains by technical scheme of the present invention:
Example 1 needs cleaning biogas impurity before extracting methane and carbon dioxide.Hydrogen sulfide impurities should can't detect, and water vapour content should be less than 0.001%.The methane composition reaches 0.6 in the biogas, carbonic acid gas-0.4 amount unit.Amount 0.064 м 3 to 100K after the separate chamber cooling, indoor have 0.14 м, 3 condensation biogas.Because biogas is heated to room temperature, pressure initiation 15 MPas in the chamber 1, the 1 interior composition that extracts from biogas continuously from the chamber extracts 0.067 м, 3 methane (0.8 V С) and 0.045 м, 3 carbonic acid gas (0.8 V С) like this.The density of methane and purity, the density and the purity that are accumulated in the methane of 4 li of gas cylinders are respectively 0.011 gram/с м 3 and 98%, and the density and the purity that are accumulated in the carbonic acid gas of 3 li of gas cylinders are respectively-0.038 gram/с м 3 and 94%.
Example 2 is with analogy one, and biogas cools off and heating.Owing to separate the biogas composition simultaneously, isolate 0.067 м, 3 methane and 0.045 м, 3 carbonic acid gas behind the separate chamber 2.The density and the purity that are stored in the methane in the gas cylinder 4 are 0.011 gram/с м 3 and 99%, and the density and the purity that are stored in the carbonic acid gas in the gas cylinder 3 are-0.038 gram/с м and 98%.
Example 3 also is that with analogy one, biogas cools off and heating.Owing to separate the biogas composition simultaneously, isolating methane is 0.076 м 3 (0.9 V С) behind the separate chamber 2, and carbonic acid gas is 0.050 м 3 (0.9 V С).The density and the purity that are stored in the methanogenesis in the gas cylinder 4 are 0.013 gram/с м 3 and 89%, and the density and the purity that are stored in the carbonic acid gas in the gas cylinder 3 are-0.047 gram/с м
With such biogas quantity, as analogy one, the density of the methane that extracts and purity are 0.001 gram/с м 3 and 90%, the density of carbonic acid gas and purity-0.0025 gram/с м 3 and 81%.
Therefore, the methane and carbon dioxide that uses the method to obtain has higher concentration and purity, and this has determined its high efficiency accumulation, with out-of-date methods comparing aspect the efficient, novel method can say the model.
Claims (7)
1. a method of extracting the purifying methane and carbon dioxide from biogas impurity comprises the following steps:
1) before extracting methane and carbon dioxide, biogas is purified, remove impurity hydrogen sulfide and water vapour;
2) separate chamber is set, is ready to methane gas cylinder and dioxide bottle, with pumping equipment separate chamber, methane gas cylinder and dioxide bottle are aspirated, make the pressure in methane gas cylinder, dioxide bottle and the separate chamber all be less than 10 handkerchiefs;
3) separate chamber is cooled off;
4) removed the biogas of impurity hydrogen sulfide and water vapour and in the separate chamber, condensed into solid-state to separate chamber's input;
5) separate chamber is heated to room temperature, making the top, separate chamber is pure methane, and the bottom is pure carbon dioxide, forms very thin intermediate zone between them, is the mixture of the gas of methane and carbon dioxide;
6) pure methane at top, separate chamber is packed in the methane gas cylinder, the pure carbon dioxide of bottom, separate chamber is packed in the dioxide bottle, when the amount of each composition is near prescribed value in methane gas cylinder and the dioxide bottle, separation stops, stay the mixed gas in the separate chamber, will do lower whorl and extract the methane and carbon dioxide use.
2. the method for from biogas impurity, extracting the purifying methane and carbon dioxide according to claim 1, it is characterized in that: the hydrogen sulfide impurities in the described biogas should can't detect, and water vapour content should be less than 0.001%.
3. the method for extracting the purifying methane and carbon dioxide from biogas impurity according to claim 1, it is characterized in that: described separate chamber is positioned in the vacuum jacketed flask, fills with the refrigerant liquid nitrogen in vacuum jacketed flask, makes separate chamber's temperature be cooled to 100K.
4. the method for extracting the purifying methane and carbon dioxide from biogas impurity according to claim 1, it is characterized in that: the pressure of separate chamber is lower than 15 MPas in the described step 5).
5. device that from biogas impurity, extracts the purifying methane and carbon dioxide that is exclusively used in the described method of the arbitrary claim of claim 1-4, comprise vacuum jacketed flask (1), separate chamber (2), methane gas cylinder (3), dioxide bottle (4) and pipeline (9), pipeline (9) front end is provided with inlet valve (14), the rear end is provided with outlet valve (10) and vacuum pressure gauge (17), separate chamber (2) is placed in the vacuum jacketed flask (1), separate chamber (2) also is equipped with heating unit, separate chamber (2) is connected to the inlet valve (14) of pipeline (9) and the line segments between the outlet valve (10), be provided with the 3rd air valve (7) between separate chamber (2) and the pipeline (9), methane gas cylinder (3) is connected with methane and advances a bottle pipeline, advance a bottle pipeline at methane and be provided with the first air valve (5), dioxide bottle (4) is connected with carbonic acid gas and advances a bottle pipeline, advance a bottle pipeline at carbonic acid gas and be provided with the second air valve (6), methane advances bottle pipeline and is communicated with the bottom of separate chamber (2), carbonic acid gas advances bottle pipeline and is communicated with the top of separate chamber (2), is leading to separate chamber (2), methane gas cylinder (3), also be respectively equipped with the pressure warning unit (13) of using for adjustable pressure on the pipeline of dioxide bottle (4), pressure warning unit (8), pressure warning unit (12).
6. the device that from biogas impurity, extracts the purifying methane and carbon dioxide according to claim 5, it is characterized in that: described carbonic acid gas advances bottle pipeline and is connected with pipeline (9), methane gas cylinder (3) also is connected with pipeline (9), be provided with the 5th air valve (11) between methane gas cylinder (3) and the pipeline (9), weather gage (15), the weather gage (16) of display bottle internal pressure all are installed on described methane gas cylinder (3), the dioxide bottle (4), described pipeline (9) rear end is connected with vacuum extractor, and outlet valve (10) is located at before the vacuum extractor.
7. the method for extracting the purifying methane and carbon dioxide from biogas impurity according to claim 6, it is characterized in that: described separate chamber also adds thermocouple assembly.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113003906A (en) * | 2021-02-22 | 2021-06-22 | 辽宁科技学院 | Chemical composition purifying and separating device and using method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113003906A (en) * | 2021-02-22 | 2021-06-22 | 辽宁科技学院 | Chemical composition purifying and separating device and using method |
| CN113003906B (en) * | 2021-02-22 | 2022-05-10 | 辽宁科技学院 | Chemical composition purifying and separating device and using method |
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Application publication date: 20130403 |