CN102250957A - Method for preparing biological natural gas and biological dry ice with water hyacinth - Google Patents
Method for preparing biological natural gas and biological dry ice with water hyacinth Download PDFInfo
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- CN102250957A CN102250957A CN2011101486140A CN201110148614A CN102250957A CN 102250957 A CN102250957 A CN 102250957A CN 2011101486140 A CN2011101486140 A CN 2011101486140A CN 201110148614 A CN201110148614 A CN 201110148614A CN 102250957 A CN102250957 A CN 102250957A
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- dry ice
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- biogas
- herba eichhorniae
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The invention relates to a method for preparing biological natural gas and biological dry ice with water hyacinth. The method comprises the steps of: step 1, pretreating water hyacinth and pumping it into a biogas fermenter for preparing biogas, removing hydrogen sulfide, carbon monoxide, nitrogen and oxygen from the biogas for standby application; step 2, preparing biological natural gas and biological dry ice. Specifically, the gas obtained in step 1 is filtered and compressed to 3.0-4.0MPaG, and then subjected to carbon dioxide removal through an amine solution, molecular sieve dehydration, liquefaction through a mixed refrigeration process and filling, so that biological natural gas can be obtained; the amine solution is collected for desorption so as to obtain carbon dioxide, which then enters a compressor through a buffer tank, and after the operations of pressure refrigeration and cooling, liquid carbon dioxide, i.e. biological dry ice can be obtained. According to the method, the biological natural gas and biological dry ice are prepared on the basis of biogas preparation, so that the utilization rate of the prepared biogas is improved and simultaneously the production benefit also can be improved.
Description
Technical field
The present invention relates to the preparation method in a kind of ecological, environmental protective field, specifically is a kind of method of utilizing Herba Eichhorniae to prepare bio-natural gas and biological dry ice.
Background technology
Develop rapidly along with Chinese manufacturing, people utilize increasing and the population dramatic growth of chemical substance, cause a large amount of trade effluents and sanitary sewage untreated, directly enter in river, river, the lake, cause water body oneself detergent power to descend and forfeiture, the water fish class can't be survived, and blue-green algae is spread unchecked, and has a strong impact on human safe drinking water.The blue-green algae in lake such as Taihu Lake, Dian Chi was spread unchecked in recent years, was exactly the result of body eutrophication.
Carry out sewage disposal at above-mentioned situation, the in recent years employing planted Herba Eichhorniae at eutrophication water in a large number, to reach the purpose that suppresses blue algae growth and improve water quality.Herba Eichhorniae is very good sewage purification plant, and it has huge root system, and big and small lateral root is had in the both sides of every root, and every lateral root is just like one hairbrush, ceaselessly the hazardous and noxious substances in absorption and the purifying river water; The stem of Herba Eichhorniae is as sponge, by the infiltration of cell, can absorb nutritive element and objectionable impuritiess such as phenol, cyanogen such as nitrogen in the water body, phosphorus, potassium, and purifying water body prevents water body " eutrophication ".Yet one of Herba Eichhorniae plant that to be the growth of generally acknowledging in the world the fastest, in year, it is 60,000 that 1 Herba Eichhorniae can rise in value, every mu can be produced the Herba Eichhorniae dry-matter is 2.7 to 11.3 tons (average 7 tons), its unordered growth meeting causes the navigation in bad border of water ecology and lake, river course and has a strong impact on, and the dead back nutrition of rotting of Herba Eichhorniae is discharged into water body once more, can cause the secondary pollution of water body.
For this reason, people's post-processed problem of Herba Eichhorniae that begins one's study.Publication number is CN101275150A, the Chinese invention patent that name is called " Herba Eichhorniae biogas energy fermentation process and products thereof utilization " discloses a kind of Herba Eichhorniae biogas energy fermentation process and products thereof utilization, this invention is carried out harmless treatment, recycling by anaerobic fermentation technology to Herba Eichhorniae, when producing biogas energy, provide high-quality and efficient organic fertilizer resource to agriculture production.By methane average content in the biogas of this patented method acquisition is 70%, be higher than general material, and aerogenesis is rapid, air demand is stable, factor of created gase is big, and the biogas that obtains is to feed user's utilization that directly acts as a fuel or generate electricity, or is pressed into behind the filling liquid as energy utilization.Utilization can be subjected to the restriction of relevant support equipment yet the feeding user directly acts as a fuel or generates electricity, and actual the use can not get excellent popularization; Directly be pressed into behind the filling liquid as energy utilization problem such as the biogas utilization rate that equally yet exists this method to make is not high, and productivity effect is not good enough.
Summary of the invention
Purpose of the present invention is exactly not high in order to overcome the biogas utilization rate that existing Herba Eichhorniae biogas energy fermentation process is worth, thus deficiency such as productivity effect is not good enough and provide a kind of and can improve the Herba Eichhorniae that utilizes that the biogas utilization rate that makes makes productivity effect increase substantially and prepare the method for bio-natural gas and biological dry ice.
Purpose of the present invention can be achieved through the following technical solutions, and the method for utilizing Herba Eichhorniae to prepare bio-natural gas and biological dry ice of the present invention may further comprise the steps:
Step 1 with the Herba Eichhorniae pre-treatment, pumps into it marsh-gas fermentation tank afterwards with preparation biogas, removes hydrogen sulfide, carbon monoxide, nitrogen and oxygen in the biogas, and is standby;
Step 2, preparation bio-natural gas and biological dry ice;
Described preparation bio-natural gas is meant the gas filtration of step 1 gained, is compressed to 3.0～4.0MPaG afterwards, successively removes carbonic acid gas, passes through molecular sieve dehydration by amine liquid then, and at last by mixed refrigeration process liquefaction, can gets bio-natural gas;
The biological dry ice of described preparation is meant and collects aforementioned amine liquid that desorb obtains carbonic acid gas, enters compressor through surge tank, the pressurization refrigeration, and cooling obtains liquid carbon dioxide, promptly biological dry ice.
Preferably, in the step 1, described pre-treatment refers to: Herba Eichhorniae is cut into segment, and the length of segment removes by filter impurity less than 60 millimeters, heating.
Preferably, in the step 1, described pre-treatment is by grid, water collecting basin, and realize in equalizing tank and intensification pond.
Preferably, in the step 1, the described employing slush pump that pumps into.
Preferably, in the step 2, described filtration refers to: gained gas is filtered by filtering unit, and then rust deposite in the biogas and foreign matter are removed.
Compared with prior art, beneficial effect of the present invention is as follows:
1, processing and preparing becomes natural gas liquids and dry ice making on the basis of biogas further, has also increased substantially productivity effect when having improved the biogas utilization rate that makes;
2, utilize Herba Eichhorniae to produce biogas as raw material, do not need the anaerobically fermenting jar structure is transformed, operation is simple; During at 25 ℃, Herba Eichhorniae half general about 4～5 days of fermentation material, bright Herba Eichhorniae got final product aerogenesis in 7～8 days at daily mean temperature, and aerogenesis speed is fast and burning is normal; The biogas that utilizes hyacinth fermentation production is with respect to the biogas that utilizes ight soil to produce, and the gas vulcanization hydrogen richness is on the low side, does not have stink substantially, and aerogenesis is effective; Press the mixed of 2:1 in addition with people's fowl and animal excrement, can improve factor of created gase more than 30%;
3, utilize by fence facility and salvaging regularly, controlled pernicious breeding of Herba Eichhorniae and secondary pollution.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment.
Embodiment
Present embodiment relates to, and to utilize Herba Eichhorniae to prepare the method implementation process of bio-natural gas and biological dry ice as follows:
Plantation: control Herba Eichhorniae at the regulation region growing with the fence mode when plantation Herba Eichhorniae is purified waste water;
Pluck: adopt the full-automatic ship of artificial salvaging or machinery to salvage unnecessary Herba Eichhorniae;
Biogas preparation: will by slush pump it be pumped into marsh-gas fermentation tank with preparation biogas after the Herba Eichhorniae raw materials pretreatment that salvage, and at last the biogas process that makes be purified to remove hydrogen sulfide, carbon monoxide, nitrogen and oxygen;
Make the liquefaction bio-natural gas: the biogas that above-mentioned steps makes is compressed to 3.0～4.0MPaG after filtering, and removes carbonic acid gas and molecular sieve dehydration by amine liquid then, and by mixed refrigeration process liquefaction, storage tank obtains the bio-natural gas that liquefies at last;
Make dry ice: after amine liquid removes carbonic acid gas in the above-mentioned steps, desorb before the co 2 liquefaction section, behind surge tank, enter compressor, after the pressurization refrigeration, cool to-78 ℃, the liquefy carbonic acid gas, this liquid carbon dioxide is in state of saturation and is dispersed in the air, and wherein part becomes the snow powder, should avenge the further processing and preparing of powder and become dry ice product.
In the present embodiment, in order to control the Herba Eichhorniae outflow, adopt the fence mode to control Herba Eichhorniae at the regulation region growing, concrete grammar: fence is linked by the numerous foam ball float of space-number rice and steel pipe, net sheet, sinker, steel cable etc., fix with anchor, can fluctuate with the lake surface change of level, resist the impact of eight grades of typhoon waves, and guarantee culture in enclosure the not excessive diffusion of Herba Eichhorniae, do not collide fragmentation.Adopt this fence mode to control Herba Eichhorniae and (, can salvage 200 square metres of waters surface for each person every day if adopt artificial the salvaging at the regulation region growing and in conjunction with regularly salvaging; If adopt the full-automatic ship of machinery to salvage, every ship can be salvaged 1200 square metres every day), better controlled pernicious breeding of Herba Eichhorniae and secondary pollution, make controllability, the reliability of utilizing Herba Eichhorniae to purify waste water further strengthen.
In the present embodiment; earlier the Herba Eichhorniae raw material that salvages is prescinded in the described biogas preparation process to less than 60 millimeters; owing to usually be mixed with foreign material in the Herba Eichhorniae raw material; for raw material is mixed, do not contain bulk solid, in order to avoid blocking pipe; be convenient to pumping; to heat material simultaneously, make its temperature even, so must carry out pre-treatment raw material.Usually adopt grid, water collecting basin, equalizing tank and intensification pond facilities such as (the intensification pond add the thermal recovery coil pipe) is realized said process.Be used for to the slush pump of marsh-gas fermentation tank charging of a great varietyly in addition, commonly used have PN type (horizontal and vertical two kinds of forms), WQ type and a ZW type etc.
3～5 meters drops are arranged between fermenting raw materials pond and the storage tank, between storage tank discharge opening and the fertilizer dewatering system 1～2 meter drop is arranged; Treat that the product after fermentation raw material and the fermentation can utilize gravity to fall save energy naturally.
In the present embodiment, the natural pond slag that the biogas preparation produces is made fertilizer, and nutritive element is moved to the farmland; The natural pond liquid that the biogas preparation produces is as foliage fertilizer or liquid manure.
In the present embodiment, after biogas is pumped out from gas-holder,, be compressed into 3.0--4.0 MPaG, transport to fluidized zone by pipe afterwards through the incoming stock compressor of pipeline.Unstripped gas at first will be filtered through a filtering unit that is arranged on inlet before this, with will be from removals such as rust deposite in the gas transmission line or foreign matters; Described filtering unit can be a mesh-like strainer etc.; After pressurization is finished, before liquefaction, at first can cause and freeze moisture and co 2 removal stifled and that heat exchanger performance is descended in low-temperature zone.For this reason, adopt amine liquid to remove carbonic acid gas and molecular sieve dehydration, be used to reduce gas concentration lwevel to 50PPM(V), and moisture content reduced to 1PPM(V) in.
In the present embodiment, desorb before the co 2 liquefaction section behind the carbonic acid gas is removed in amine liquid absorption, behind surge tank, enters compressor, after the pressurization refrigeration, cools to-78 ℃, becomes Liquid carbon dioxide.When liquid carbon dioxide is in state of saturation (following 20 ℃ of pressure 2 MPas, zero temperature) and is dispersed in the air, because the latent heat effect, 60% carbonic acid gas can become gas; And other 40% will become snow, also be the method that present embodiment adopts according to traditional dry ice manufacture method of present use, will this state snow generate through the hydraulic efficiency piston press molding, generate initial rectangular solid thing.Then the rectangular solid thing is cut into square, even can further cut by the cutting central factory.At the cutting central factory, block dry ice product forms through the equipment cutting of band saw and annular saw and so on.Also have another kind of scheme, adopt particle manufacture equipment that the snow powder is squeezed into thin barred body, these thin barred bodies will be cut into unified length and make granularly, be configured as finished product by extruding or reformer more at last, thereby exempt the needs of cutting fully.Produce great amount of carbon dioxide flue gas environment because no longer exist in the cutting process, adopt this scheme also will reduce vaporization losses and improve Working environment.
The present invention is applied to the Dian Chi and administers, and can bring following effect: 1) bring 3.5 hundred million GDP for the locality; 2) whole industry drives nearly 300 people employment; 3) increase by 2.4 hundred million GDP than marsh gas power generation; 4) the natural pond slag is made fertilizer, and nutritive element is moved to the farmland; 5) natural pond liquid can be done foliage fertilizer and liquid manure; 6) carbonic acid gas system dry ice is used for industry, beverage and hospital, and recycle reduces discharging; 7) Dian Chi water quality is improved to 3 classes from present bad 5 classes.
Method of the present invention can be applied to large-scale freshwater lake and rivers such as Taihu Lake, Huaihe River, Chaohu, Dongting Lake, also can be used for crisscross water body lake surface and river in the large-scale cities such as Shanghai City, Beijing, improve city water quality, improve the Herba Eichhorniae utilization ratio, reduce greenhouse gas emission, have very important ecological, environmental protective benefit and economic benefit.
Claims (5)
1. a method of utilizing Herba Eichhorniae to prepare bio-natural gas and biological dry ice is characterized in that, may further comprise the steps:
Step 1 with the Herba Eichhorniae pre-treatment, pumps into it marsh-gas fermentation tank afterwards with preparation biogas, removes hydrogen sulfide, carbon monoxide, nitrogen and oxygen in the biogas, and is standby;
Step 2, preparation bio-natural gas and biological dry ice;
Described preparation bio-natural gas is meant the gas filtration of step 1 gained, is compressed to 3.0 MPaG～4.0MPaG afterwards, successively remove carbonic acid gas, pass through molecular sieve dehydration then by amine liquid, by mixed refrigeration process liquefaction, can gets bio-natural gas at last;
The biological dry ice of described preparation is meant and collects aforementioned amine liquid that desorb obtains carbonic acid gas, enters compressor through surge tank, the pressurization refrigeration, and cooling obtains liquid carbon dioxide, promptly biological dry ice.
2. the method for utilizing Herba Eichhorniae to prepare bio-natural gas and biological dry ice as claimed in claim 1 is characterized in that, in the step 1, described pre-treatment refers to: Herba Eichhorniae is cut into segment, and the length of segment removes by filter impurity less than 60 millimeters, heating.
3. the method for utilizing Herba Eichhorniae to prepare bio-natural gas and biological dry ice as claimed in claim 1 is characterized in that, in the step 1, described pre-treatment is by grid, water collecting basin, and realize in equalizing tank and intensification pond.
4. the method for utilizing Herba Eichhorniae to prepare bio-natural gas and biological dry ice as claimed in claim 1 is characterized in that,
In the step 1, the described employing slush pump that pumps into.
5. the method for utilizing Herba Eichhorniae to prepare bio-natural gas and biological dry ice as claimed in claim 1 is characterized in that, in the step 2, described filtration refers to: gained gas is filtered by filtering unit, and then rust deposite in the biogas and foreign matter are removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101486140A CN102250957A (en) | 2011-06-03 | 2011-06-03 | Method for preparing biological natural gas and biological dry ice with water hyacinth |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101486140A CN102250957A (en) | 2011-06-03 | 2011-06-03 | Method for preparing biological natural gas and biological dry ice with water hyacinth |
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| CN102250957A true CN102250957A (en) | 2011-11-23 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101314780A (en) * | 2007-05-29 | 2008-12-03 | 黄卫东 | Method for producing methyl hydride and electricity with solar energy |
| CN101691320A (en) * | 2009-10-14 | 2010-04-07 | 清华大学 | Method for purifying and recycling methane and carbon dioxide from landfill gas and device thereof |
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2011
- 2011-06-03 CN CN2011101486140A patent/CN102250957A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101314780A (en) * | 2007-05-29 | 2008-12-03 | 黄卫东 | Method for producing methyl hydride and electricity with solar energy |
| CN101691320A (en) * | 2009-10-14 | 2010-04-07 | 清华大学 | Method for purifying and recycling methane and carbon dioxide from landfill gas and device thereof |
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Application publication date: 20111123 |