CN103881778A - Biogas purifying process of substituting acetylene for gas cutting - Google Patents
Biogas purifying process of substituting acetylene for gas cutting Download PDFInfo
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- CN103881778A CN103881778A CN201410093474.5A CN201410093474A CN103881778A CN 103881778 A CN103881778 A CN 103881778A CN 201410093474 A CN201410093474 A CN 201410093474A CN 103881778 A CN103881778 A CN 103881778A
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- biogas
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- carbon dioxide
- gas cutting
- acetylene
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Abstract
The invention discloses a biogas purifying process of substituting acetylene for gas cutting. The biogas purifying process comprises processes of desulphurization, dehydration and carbon dioxide removal, wherein during wet-process desulphurization, a desulfurizing agent with cobalt phthalocyanine sodium tetrasulfonate as a primary body is used; during dry-process desulphurization, desulphurization is performed by using iron oxide or zinc oxide as a catalyst. The carbon dioxide removal process is used for changing carbon dioxide into a liquid by adopting a refrigerating way under certain pressure according to difference of physical properties of the carbon dioxide and methane, wherein alkyl sodium sulfonate, triethylene tetramine, an imidazoline cationic compound and alcohol are taken as raw materials of the synergist. When the prepared synergistic industrial biogas substitutes acetylene for gas cutting, the ratio of the biogas to an oxygen gas is 5:5. The biogas purifying process disclosed by the invention can be used for solving the technical problem that the common biogas cannot be used as an industrial biogas due to low active ingredient content and many impurities of the common biogas, and has small methane loss amount; the prepared gas methane is high in concentration, and used as the biogas for substituting acetylene for gas cutting.
Description
Technical field
The present invention relates to a kind of purification process of biogas, relate in particular the marsh gas purifying technique of a kind of alternative acetylene for gas cutting.
Background technology
Biogas be organic substance in anaerobic environment, under the condition of certain temperature, humidity, potential of hydrogen, pass through microbial process, a kind of inflammable gas producing, at present, common biogas can only be civilian or for generating, because it is low containing effective constituent amount, impurity is many, cannot use as industrial methane.The direct products that in methane-generating pit, fermentation obtains are biogas, and its main component is methane (CH
4), the content 55～65% of methane in biogas; Next is carbonic acid gas (CO
2), content 30～38%; In addition also has other gas, as hydrogen sulfide, carbon monoxide, nitrogen, water vapour etc.Biogas and gas component differ greatly, and natural gas methane content reaches 96%, and calorific value reaches 33～36MJ/m
3, and biogas calorific value only has 20～25MJ/m
3, this has just limited the use range of biogas.Acetylene gas can be used as industrial chemicals, automobile fuel etc.Acetylene gas is as automobile fuel, and its carbon monoxide, oxynitride, sulfide and carbon dioxide emission level are all significantly less than gasoline, diesel-engined vehicle.The acetylene gas not carbon distribution that burns in engine, does not does not wear and tear, and running cost is very low, is a kind of environment-friendly type substituted energy.Marsh gas purifying is produced acetylene gas, and its key is decarburization, and the loss amount of current used its methane of biogas decarbonation mode is large, and gained methane concentration is relatively low; And system complex, unit scale is huge, and investment is large, working cost is high, and methane loss is also higher.Therefore, utilize biogas preparing natural gas to play a positive role to solution energy dilemma, energy-saving and emission-reduction, protection of the environment, have huge social benefit.
Summary of the invention
The technical problem to be solved in the present invention is to provide the marsh gas purifying technique of a kind of alternative acetylene for gas cutting, solve its, the impurity many technical problems that cannot as industrial methane use low containing effective constituent amount of common biogas, this technique methane loss amount is little, the natural gas methane concentration making is high, but also the hydrogen sulfide in biogas, carbon dioxide removal are more up hill and dale removed.
For solving the problems of the technologies described above, the invention provides the marsh gas purifying technique of a kind of alternative acetylene for gas cutting, comprise desulfurization, dehydration and decarbonation operation, concrete steps are:
1, raw material biogas is carried out to pressurized treatment, after supercharging, the pressure-controlling of raw material biogas is between 1.0MPa～1.5MPa;
2, biogas is carried out to wet desulphurization and dry desulfurization is removed the hydrogen sulfide in biogas, obtain desulfurization biogas;
3, the raw material biogas after above-mentioned supercharging is carried out to carbon dioxide removal processing, remove the carbon dioxide wherein containing;
4, by desulfurization, decarburization biogas through aqueous vapor separation, compression, coolingly slightly dewater, then carry out essence dehydration with molecular sieve, obtain the biogas that dewaters;
5, adopt the refrigeration techniques biogas that will dewater cooling, the carbon dioxide condensing that makes to dewater in biogas becomes liquid to remove;
6, above-mentioned purifying marsh gas is carried out to processed compressed, the pressure of purifying marsh gas is reached between 20MPa～25MPa;
7, by the biogas of above-mentioned purification, compression, enter qi-promoting prescription combination treatment through the mixing unit that synergistic agent is housed, make and substitute the biogas of acetylene for gas cutting.
Described wet desulphurization is to use the sweetening agent that formal name used at school is main body in Cobalt Phthalocyanine tetrasulfonic acid sodium, because its special chemical structure has extremely strong oxygen uptake oxygen carrying capability, constantly discharges and have very strong active atomic oxygen in sweetening process, can be rapidly by H in system
2s and part organosulfur are converted into elemental sulfur, thereby greatly improve desulfuration efficiency.
Described dry desulfurization is to use ferric oxide or zinc oxide to carry out desulfurization as catalyzer.
Described carbon dioxide removal operation utilizes the physical properties of carbonic acid gas and methane different, under certain pressure, adopts refrigeration modes, makes carbonic acid gas become liquid, thereby realizes the separation of methane and carbon dioxide.
Described synergistic agent is to be raw material by alkyl sodium sulfonate, triethylene tetramine, Imidazole cation compound and ethanol.
Further illustrate, while making the alternative acetylene of synergy industrial methane for gas cutting, biogas is 5 to 5 with the ratio of oxygen.
Usefulness of the present invention is:
The present invention solves its, the impurity many technical problems that cannot as industrial methane use low containing effective constituent amount of common biogas, this technique methane loss amount is little, the gases methane concentration making is high, but also has removed the hydrogen sulfide in biogas, carbon dioxide removal more up hill and dale.In the biogas after purification, supercharging, add synergistic agent, the even rapid diffusion of this synergistic agent, fully be mixed with purifying marsh gas, purifying marsh gas is there is to effect of catalysis, reformation, thereby change the combustionproperty of biogas, in this process, the carbochain of biogas can be scraped, biogas is fully burnt, to reach the utilization ratio and the thermal effect that improve biogas, be and substitute the biogas of acetylene for gas cutting.For nontoxic non-staining clean green energy resource, technical scheme provided by the invention is also applicable to Sweet natural gas and all kinds of petroleum gas simultaneously.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with process flow sheet and specific embodiment, the invention will be further described.
Alternative acetylene is for a marsh gas purifying technique for gas cutting, and concrete steps are as follows:
1, raw material biogas is carried out to pressurized treatment, after supercharging, the pressure-controlling of raw material biogas is between 1.0MPa～1.5MPa;
2, by using the sweetening agent that Cobalt Phthalocyanine tetrasulfonic acid sodium is main body to carry out wet desulphurization to biogas, re-use ferric oxide or zinc oxide and carry out dry desulfurization as catalyzer, remove the hydrogen sulfide in biogas, obtain desulfurization biogas;
3, the raw material biogas after above-mentioned supercharging is adopted to refrigeration modes, make carbonic acid gas become liquid, thereby realize the separation removal carbon dioxide treatment of methane and carbon dioxide, remove the carbon dioxide wherein containing;
4, by desulfurization, decarburization biogas through aqueous vapor separation, compression, coolingly slightly dewater, then carry out essence dehydration with molecular sieve, obtain the biogas that dewaters;
5, adopt the refrigeration techniques biogas that will dewater cooling, the carbon dioxide condensing that makes to dewater in biogas becomes liquid to remove;
6, above-mentioned purifying marsh gas is carried out to processed compressed, the pressure of purifying marsh gas is reached between 20MPa～25MPa;
7, by the biogas of above-mentioned purification, compression, the mixing unit that it is raw material synergistic agent that process is equipped with by alkyl sodium sulfonate, triethylene tetramine, Imidazole cation compound and ethanol enters qi-promoting prescription combination treatment, makes and substitutes the biogas of acetylene for gas cutting.
Claims (7)
1. alternative acetylene is for the marsh gas purifying technique of gas cutting, it is characterized in that described raw material biogas being carried out to pressurized treatment, and after supercharging, the pressure-controlling of raw material biogas is between 1.0MPa～1.5MPa.
2. a kind of alternative acetylene according to claim 1 is for the marsh gas purifying technique of gas cutting, it is characterized in that the sweetening agent that described use Cobalt Phthalocyanine tetrasulfonic acid sodium is main body carries out wet desulphurization to biogas, re-use ferric oxide or zinc oxide and carry out dry desulfurization as catalyzer, remove the hydrogen sulfide in biogas, obtain desulfurization biogas.
3. a kind of alternative acetylene according to claim 1 is for the marsh gas purifying technique of gas cutting, it is characterized in that described raw material biogas after above-mentioned supercharging being adopted to refrigeration modes, make carbonic acid gas become liquid, thereby realize the separation removal carbon dioxide treatment of methane and carbon dioxide, remove the carbon dioxide wherein containing.
4. a kind of alternative acetylene according to claim 1 is for the marsh gas purifying technique of gas cutting, it is characterized in that described by desulfurization, decarburization biogas through aqueous vapor separation, compression, coolingly slightly dewater, then carry out essence with molecular sieve and dewater, obtain the biogas that dewaters.
5. a kind of alternative acetylene according to claim 1 is for the marsh gas purifying technique of gas cutting, it is characterized in that the described employing refrigeration techniques biogas that will dewater is cooling, and the carbon dioxide condensing that makes to dewater in biogas becomes liquid to remove.
6. a kind of alternative acetylene according to claim 1 is for the marsh gas purifying technique of gas cutting, it is characterized in that described above-mentioned purifying marsh gas being carried out to processed compressed, and the pressure of purifying marsh gas is reached between 20MPa～25MPa.
7. a kind of alternative acetylene according to claim 1 is for the marsh gas purifying technique of gas cutting, it is characterized in that described by the biogas of above-mentioned purification, compression, the mixing unit that it is raw material synergistic agent that process is equipped with by alkyl sodium sulfonate, triethylene tetramine, Imidazole cation compound and ethanol enters qi-promoting prescription combination treatment, makes and substitutes the biogas of acetylene for gas cutting.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105771992A (en) * | 2016-05-13 | 2016-07-20 | 北京三聚环保新材料股份有限公司 | Preparation method and application of low-cost catalyst |
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2014
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105771992A (en) * | 2016-05-13 | 2016-07-20 | 北京三聚环保新材料股份有限公司 | Preparation method and application of low-cost catalyst |
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Application publication date: 20140625 |