CN112812799A - Solvent and method for removing biomass gasification tar - Google Patents
Solvent and method for removing biomass gasification tar Download PDFInfo
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- CN112812799A CN112812799A CN201911125902.7A CN201911125902A CN112812799A CN 112812799 A CN112812799 A CN 112812799A CN 201911125902 A CN201911125902 A CN 201911125902A CN 112812799 A CN112812799 A CN 112812799A
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- 238000002309 gasification Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 46
- 239000002904 solvent Substances 0.000 title claims abstract description 30
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims abstract description 54
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- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid group Chemical group C(CCCCCCC\C=C/CCCCCCCC)(=O)O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims abstract description 54
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 239000012159 carrier gas Substances 0.000 claims description 2
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- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 238000003786 synthesis reaction Methods 0.000 abstract description 6
- 238000005070 sampling Methods 0.000 description 33
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- 239000000126 substance Substances 0.000 description 20
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- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 10
- 229910001873 dinitrogen Inorganic materials 0.000 description 10
- 230000008569 process Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 7
- 230000002572 peristaltic effect Effects 0.000 description 7
- OYHQOLUKZRVURQ-HZJYTTRNSA-N Linoleic acid Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(O)=O OYHQOLUKZRVURQ-HZJYTTRNSA-N 0.000 description 6
- 235000020778 linoleic acid Nutrition 0.000 description 6
- OYHQOLUKZRVURQ-IXWMQOLASA-N linoleic acid Natural products CCCCC\C=C/C\C=C\CCCCCCCC(O)=O OYHQOLUKZRVURQ-IXWMQOLASA-N 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 235000019484 Rapeseed oil Nutrition 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
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- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
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- 239000010687 lubricating oil Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000004227 thermal cracking Methods 0.000 description 3
- FLIACVVOZYBSBS-UHFFFAOYSA-N Methyl palmitate Chemical compound CCCCCCCCCCCCCCCC(=O)OC FLIACVVOZYBSBS-UHFFFAOYSA-N 0.000 description 2
- 238000004523 catalytic cracking Methods 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
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- OYHQOLUKZRVURQ-NTGFUMLPSA-N (9Z,12Z)-9,10,12,13-tetratritiooctadeca-9,12-dienoic acid Chemical compound C(CCCCCCC\C(=C(/C\C(=C(/CCCCC)\[3H])\[3H])\[3H])\[3H])(=O)O OYHQOLUKZRVURQ-NTGFUMLPSA-N 0.000 description 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 1
- 235000010676 Ocimum basilicum Nutrition 0.000 description 1
- 240000007926 Ocimum gratissimum Species 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
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- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
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- 229930195729 fatty acid Natural products 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- -1 octadecenoic acid Chemical compound 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000019198 oils Nutrition 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- LXXWKCAIQDMAJD-UHFFFAOYSA-N phenol;toluene Chemical compound CC1=CC=CC=C1.OC1=CC=CC=C1 LXXWKCAIQDMAJD-UHFFFAOYSA-N 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
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- LKOVPWSSZFDYPG-WUKNDPDISA-N trans-octadec-2-enoic acid Chemical compound CCCCCCCCCCCCCCC\C=C\C(O)=O LKOVPWSSZFDYPG-WUKNDPDISA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C1/00—Working-up tar
- C10C1/18—Working-up tar by extraction with selective solvents
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C1/00—Working-up tar
- C10C1/04—Working-up tar by distillation
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Industrial Gases (AREA)
Abstract
The solvent is oleic acid, the biomass gasification synthesis gas is washed by the oleic acid, tar in the synthesis gas is absorbed, the tar can be efficiently removed, and the method has the advantages of simple operation, no secondary pollution and low cost.
Description
Technical Field
The invention relates to the technical field of biomass gasification, in particular to a solvent and a method for removing biomass gasification tar.
Background
The biomass is the fourth largest energy after coal, oil and natural gas, and plays an important role in the whole energy system. At present, the biomass gasification technology is one of the main technologies for resource utilization of biomass and is also the most widely applied technology, and the gasification can convert the biomass into combustible gas such as CH4、H2CO, etc. However, the gasification process generates tar which is a byproduct, is easy to condense and contains acidic substances, so that the pipeline is seriously blocked, even the subsequent equipment is corroded, the gasification efficiency is reduced, and secondary pollution is easily caused.
The tar removal methods are mainly classified into chemical methods and physical methods. The chemical processes being mainly thermal cracking and catalytic crackingThe method is carried out. The thermal cracking method increases the temperature, when the temperature exceeds the tar cracking temperature value, the macromolecular tar can be cracked into small molecular tar, and then the small molecular tar is further cracked into CH4、H2、CO、CO2And the like; the method has high requirement on temperature and high cost. For the catalytic cracking method, under the action of a catalyst, tar is cracked to be changed into smaller molecular tar or CH4, H2 and the like, and the method has higher requirements on the catalytic effect and the stability of the catalyst, so that the selection or preparation of a proper catalyst is the core of the method. The physical methods mainly include an adsorption method and a solvent method. The adsorption method mainly utilizes the active carbon to absorb tar, has the advantages of selectively absorbing tar, directly burning the active carbon after absorbing the tar for secondary utilization, and has the defect that the active carbon is easily blocked by heavy tar to cause abnormal adsorption. The solvent method is usually a water washing method and an organic solvent washing method. The washing method has low cost, and meanwhile, most of substances in the tar are not dissolved in water, and hydrophobic substances are easy to separate, but the washing method is not suitable for removing the tar containing more phenolic substances because phenolic substances are very easy to dissolve in water and phenolic wastewater is difficult to treat. The core of the organic solvent washing method lies in the selection of the solvent, and the tar molecules can be removed efficiently and pertinently at low cost by selecting a proper organic solvent according to the principle of similarity and compatibility.
At present, for domestic research, tar removal experimental research is carried out on different absorbents, namely ethylene glycol, diethanolamine/diethylene glycol and triethanolamine/triethylene glycol, of the university of east China's science and technology, wherein the removal efficiency is over 90 percent, but the selected solvent has high cost, toxicity, stronger volatility and poorer safety; by testing, Guo Feiqiang et al at Shandong university analyze the decoking performance of 3 typical solvents, the removal efficiency of tar reaches 90% at most, but the removal efficiency is difficult to meet the requirement of biomass gasification gas purification.
For foreign studies, Georgio basil et al, france, simulated the removal of benzene, toluene, phenol by "water + methyl palmitate". Turkish B.OZTURK et al explored the removal of benzene and toluene from glycerides and lubricating oils and waste glycerides and lubricating oil, respectively, with removal efficiencies of 90% and less than 80% for glycerides and lubricating oils. In foreign research, the selected solvent needs to be matched with different subsequent processes or turbulence disturbance of the solvent is enhanced, so that higher removal efficiency can be achieved, but the process complexity and the operation cost are increased.
Disclosure of Invention
In view of the above, the main object of the present invention is to provide a solvent and a method for removing biomass gasification tar, so as to at least partially solve at least one of the above mentioned technical problems.
In order to achieve the purpose, the technical scheme of the invention is as follows:
as one aspect of the invention, a solvent for removing biomass gasification tar is provided, and the solvent is oleic acid.
As another aspect of the invention, a method for removing biomass gasification tar is provided, which comprises the following steps: oleic acid is used as a solvent to absorb biomass gasification tar.
As a further aspect of the invention, there is provided a use of oleic acid in the removal of biomass gasification tar.
According to the technical scheme, the solvent and the method for removing the biomass gasification tar have at least one or part of the following beneficial effects:
(1) the oleic acid solvent in the invention is nontoxic and odorless, has high safety, is cheap and easy to obtain, and is beneficial to reducing the removal cost; oleic acid and tar have extremely high affinity, so that tar can be efficiently removed, and the problem that the biomass gasification tar is difficult to remove is solved.
(2) Compared with a thermal cracking method, the method used in the invention reduces the operation cost; compared with a catalytic cracking method, the method can keep the tar removal efficiency high for a long time, and solves the problems of high tar removal cost and unstable removal efficiency in biomass gasification.
(3) The tar removal method is simple to operate and convenient to popularize, secondary pollution is avoided, and the oleic acid after absorbing the tar is a high-quality fuel and can be returned to the furnace again for combustion and energy supply.
(4) The invention responds to the call of energy conservation and emission reduction, efficiently removes tar, greatly reduces tar components in tail gas, protects tail gas equipment, and reduces the cost of maintaining pipelines and equipment. The operation process is not influenced by the condition of the front-end equipment.
Drawings
FIG. 1 is a schematic view of an apparatus for removing biomass gasification tar used in the present invention.
In the above drawings, the reference numerals have the following meanings:
1-nitrogen cylinder, 2-air inlet control valve, 3-mass flowmeter, 4-heater, 5-peristaltic pump, 6-thermocouple, 7-stop valve, 8-stop valve, 9-filter bottle, 10-three-port washer, 11-control panel and 12-sampling device.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
The invention provides a novel solvent and a method for removing biomass gasification tar, which are used for washing biomass gasification synthesis gas by utilizing oleic acid and absorbing tar in the synthesis gas. Oleic acid is a single fatty acid and is one of the components that make up vegetable oils. However, vegetable oils are of various types and complex in components, and not every component has a good tar removal effect. The oleic acid has better capacity of absorbing polar substances and nonpolar substances, and the inventor finds that the oleic acid can be used as a solvent to absorb tar containing both polar substances and nonpolar substances. The invention responds to the call of energy conservation and emission reduction, efficiently removes tar which harms pipelines and tail gas equipment in the biomass gasification process, effectively protects facilities outside the furnace and is not influenced by gasification conditions in the operation process.
Specifically, according to some embodiments, the present invention provides a solvent for removing biomass gasification tar, wherein the solvent is oleic acid. Oleic acid, namely octadecenoic acid, contains a C ═ C double bond and a polar functional group carboxyl (-COOH), wherein the long chain hydrocarbon and the C ═ C double bond are nonpolar, so that the oleic acid can absorb nonpolar substances in the tar, and the carboxyl is a polar functional group, so that the oleic acid can absorb polar substances in the tar.
According to some embodiments, the present invention also provides a method for removing biomass gasification tar, comprising the steps of: oleic acid is used as a solvent to absorb biomass gasification tar.
Wherein, the step of absorbing biomass gasification tar by using oleic acid as a solvent comprises the following steps:
substep 1: heating and vaporizing the biomass gasification tar;
substep 2: and (3) taking inert gas as carrier gas, and introducing the gasified biomass tar into oleic acid for absorption.
Wherein the temperature of the oleic acid is preferably 20-40 ℃. If the temperature is too low, the oleic acid can be solidified, and is not beneficial to absorbing tar; too high a temperature will reduce the solubility of tar in oleic acid and also will not facilitate the absorption of tar.
Wherein, the biomass gasification tar is heated to 220-250 ℃, which is beneficial to fully gasifying the biomass gasification tar and avoiding being condensed before the oleic acid is introduced.
Wherein the biomass gasification tar is contained in the biomass gasification synthesis gas, thereby completing the purification of the biomass gasification synthesis gas.
According to some embodiments, the present invention also provides the use of oleic acid in the removal of biomass gasification tar.
The technical solution of the present invention will be described in detail below by referring to a plurality of specific examples. It should be noted that the following specific examples are only for illustration and are not intended to limit the invention.
Inventive examples 1-3 and comparative examples 1-2 remove biomass gasification tar using the apparatus shown in fig. 1. Preparing 200g of mixed tar according to the condition that the mass ratio of benzene, toluene and phenol is 5: 3: 2; the inlet concentrations of benzene, toluene and phenol were stabilized at 34.6g/m respectively by adjusting3，20.7g/m3And 13.8g/m3。
Example 1
The step of removing biomass gasification tar comprises the following steps:
1. starting a control panel 11, opening a nitrogen gas cylinder 1, opening an air inlet control valve 2 and a mass flow meter 3, adjusting the flow rate of nitrogen gas to be 200mL/min, and blowing away residual gas in a heater 4; the heater 4 was turned on and the temperature was set to 250 ℃.
2. Setting the temperature of a three-port washer 10 to be 20 ℃, loading 500ml of oleic acid into the three-port washer 10, inserting a thermocouple into the three-port washer 10, connecting an outlet of the three-port washer with a sampling device 12, connecting an inlet of the oleic acid and an inlet of a filter bottle to a heater 4 through a tee joint and a pipeline, closing a valve 8 on the pipeline, and opening a valve 7.
3. And monitoring the temperature by using a thermocouple 6, cleaning the peristaltic pump 5 when the temperature rises to 240 ℃, introducing tar for 1-2min through the peristaltic pump 5, and lubricating a pipeline. When the temperature rises to 250 ℃, the tar is introduced, after the system is stabilized, the valve 7 is closed, the valve 8 is opened, and the vaporized tar gas is introduced into the oleic acid.
4. Introducing oleic acid into the gas, and sampling once every 20 minutes; during sampling, four wide-mouth bottles containing 100ml of isopropanol are immersed in an ice-water mixture to serve as sampling devices 12, the temperature of each sampling device 12 is controlled to be +/-3 ℃, and the sampling devices are connected with air outlets to perform sampling.
5. After sampling, the components and contents were determined by GC-MS.
Example 2
The step of removing biomass gasification tar comprises the following steps:
1. starting a control panel 11, opening a nitrogen gas cylinder 1, opening an air inlet control valve 2 and a mass flow meter 3, adjusting the flow rate of nitrogen gas to be 200mL/min, and blowing away residual gas in a heater 4; the heater 4 was turned on and the temperature was set to 250 ℃.
2. Setting the temperature of a three-port washer 10 to be 30 ℃, loading 500ml of oleic acid into the three-port washer 10, inserting a thermocouple into the three-port washer 10, connecting an outlet of the three-port washer with a sampling device 12, connecting an inlet of the oleic acid and an inlet of a filter bottle to a heater 4 through a tee joint and a pipeline, closing a valve 8 on the pipeline, and opening a valve 7.
3. And monitoring the temperature by using a thermocouple 6, cleaning the peristaltic pump 5 when the temperature rises to 240 ℃, introducing tar for 1-2min through the peristaltic pump 5, and lubricating a pipeline. When the temperature rises to 250 ℃, the tar is introduced, after the system is stabilized, the valve 7 is closed, the valve 8 is opened, and the vaporized tar gas is introduced into the oleic acid.
4. Introducing oleic acid into the gas, and sampling once every 20 minutes; during sampling, four wide-mouth bottles containing 100ml of isopropanol are immersed in an ice-water mixture to serve as sampling devices 12, the temperature is controlled between-1 ℃ and 3 ℃, and the wide-mouth bottles are connected with an air outlet to perform sampling.
5. After sampling, the components and contents were determined by GC-MS.
Example 3
The step of removing biomass gasification tar comprises the following steps:
1. starting a control panel 11, opening a nitrogen gas cylinder 1, opening an air inlet control valve 2 and a mass flow meter 3, adjusting the flow rate of nitrogen gas to be 200mL/min, and blowing away residual gas in a heater 4; the heater 4 was turned on and the temperature was set to 250 ℃.
2. Setting the temperature of a three-port washer 10 to be 40 ℃, loading 500ml of oleic acid into the three-port washer 10, inserting a thermocouple into the three-port washer 10, connecting an outlet of the three-port washer with a sampling device 12, connecting an inlet of the oleic acid and an inlet of a filter bottle to a heater 4 through a tee joint and a pipeline, closing a valve 8 on the pipeline, and opening a valve 7.
3. Monitoring temperature with thermocouple 6, cleaning peristaltic pump 5 when temperature rises to 240 deg.C, introducing tar for 1-2min, and lubricating pipeline. When the temperature rises to 250 ℃, the tar is introduced, after the system is stabilized, the valve 7 is closed, the valve 8 is opened, and the vaporized tar gas is introduced into the oleic acid.
4. Introducing oleic acid into the gas, and sampling once every 20 minutes; during sampling, four wide-mouth bottles containing 100ml of isopropanol are immersed in an ice-water mixture to serve as sampling devices 12, the temperature is controlled between-1 ℃ and 3 ℃, and the wide-mouth bottles are connected with an air outlet to perform sampling.
5. After sampling, the components and concentrations were determined by GC-MS.
Comparative example 1
The step of removing biomass gasification tar comprises the following steps:
1. starting a control panel 11, opening a nitrogen gas cylinder 1, opening an air inlet control valve 2 and a mass flow meter 3, adjusting the flow rate of nitrogen gas to be 200mL/min, and blowing away residual gas in a heater 4; the heater 4 was turned on and the temperature was set to 250 ℃.
2. Setting the temperature of a three-port washer 10 to be 20 ℃, loading 500ml of linoleic acid into the three-port washer 10, inserting a thermocouple into the three-port washer 10, connecting an outlet of the three-port washer with a sampling device 12, connecting an inlet of the linoleic acid and an inlet of a filter bottle to a heater 4 through a tee joint and a pipeline, closing a valve 8 on the pipeline, and opening a valve 7.
3. Monitoring temperature with thermocouple 6, cleaning peristaltic pump 5 when temperature rises to 240 deg.C, introducing tar for 1-2min, and lubricating pipeline. When the temperature rises to 250 ℃, the tar is introduced, after the system is stabilized, the valve 7 is closed, the valve 8 is opened, and the vaporized tar gas is introduced into the linoleic acid.
4. Introducing linoleic acid into the sample, and sampling once every 20 minutes; during sampling, four wide-mouth bottles containing 100ml of isopropanol are immersed in an ice-water mixture to serve as sampling devices 12, the temperature is controlled between-1 ℃ and 3 ℃, and the wide-mouth bottles are connected with an air outlet to perform sampling.
5. After sampling, the components and concentrations were determined by GC-MS.
Comparative example 2
1. Starting a control panel 11, opening a nitrogen gas cylinder 1, opening an air inlet control valve 2 and a mass flow meter 3, adjusting the flow rate of nitrogen gas to be 200mL/min, and blowing away residual gas in a heater 4; the heater 4 was turned on and the temperature was set to 250 ℃.
2. Setting the temperature of a three-port washer 10 to be 20 ℃, loading 500ml rapeseed oil into the three-port washer 10, inserting a thermocouple into the three-port washer 10, connecting an outlet of the three-port washer with a sampling device 12, connecting an inlet of the rapeseed oil and an inlet of a filter bottle to a heater 4 through a tee joint and a pipeline, closing a valve 8 on the pipeline, and opening a valve 7.
3. Monitoring temperature with thermocouple 6, cleaning peristaltic pump 5 when temperature rises to 240 deg.C, introducing tar for 1-2min, and lubricating pipeline. When the temperature rises to 250 ℃, the tar is introduced, after the system is stabilized, the valve 7 is closed, and the valve 8 is opened, so that the vaporized tar gas is introduced into the rapeseed oil.
4. After introducing the rapeseed oil, sampling once every 20 minutes; during sampling, four wide-mouth bottles containing 100ml of isopropanol are immersed in an ice-water mixture to serve as sampling devices 12, the temperature is controlled between-1 ℃ and 3 ℃, and the wide-mouth bottles are connected with an air outlet to perform sampling.
5. After sampling, the components and concentrations were determined by GC-MS.
Analysis of tar outlet concentration and removal efficiency:
the above examples and comparative examples were analyzed by GC-MS and the resulting outlet concentrations are shown in table 1 below:
TABLE 1 GC-MS analysis results of examples and comparative examples
Note: the unit of concentration in the table is g/m3
The average removal efficiency was calculated from the component concentrations obtained in table 1, as shown in table 2 below:
TABLE 2 average removal efficiency
| Temperature of | Benzene and its derivatives | Toluene | Phenol and its preparation | |
| Example 1 | 20℃ | 97.1％ | 94.1％ | 100.0％ |
| Example 2 | 30℃ | 94.8％ | 96.8％ | 99.6％ |
| Example 3 | 40℃ | 94.6％ | 73.2％ | 100.0％ |
| Comparative example 1 | 20℃ | 93.1％ | 89.4％ | 99.3％ |
| Comparative example 2 | 20℃ | 96.7％ | 93.7％ | 100.0％ |
The results in tables 1 and 2 show that oleic acid has a strong tar absorption capacity without any subsequent process and enhanced solvent turbulence, and that the removal efficiency of benzene, toluene and phenol is superior to the removal efficiency of various tar-removing solvents and process couplings mentioned in the background introduction. The reason is presumed to be: oleic acid contains an oxygen-containing functional group (-COOH). The functional group is a polar functional group, is easy to form van der Waals force with polar substances to be combined, has the characteristic of easy dissolution of hydrophilic substances, and can well dissolve some polar substances such as phenols; meanwhile, the hydrocarbon long chain except the functional group is a nonpolar long chain and has the hydrophobic characteristic, and the longer the chain length is, the more symmetrical the structure is, the larger the nonpolar is, so that the oleic acid can well dissolve some nonpolar substances;
furthermore, linoleic acid was found to be less efficient than oleic acid in its removal by comparison with linoleic acid, presumably due to: although the C ═ C unsaturated double bond in the long chain hydrocarbon is a nonpolar bond, the more the number is, the more nonpolar the long chain hydrocarbon is; however, the main factor affecting the magnitude of the non-polarity is again dependent on the symmetry of the chain length and structure, so oleic acid has a better tar removal efficiency than linoleic acid. The inventors have also found that oleic acid alone has superior tar absorption capacity compared to vegetable oils containing multiple ingredients. In conclusion, the oleic acid can better absorb polar substances and non-polar substances due to the property of the oleic acid, and is a novel solvent for efficiently absorbing tar.
In conclusion, the invention utilizes oleic acid which is one of main components in vegetable oil to remove the most difficult tar molecules in gasification, and compared with the traditional method which uses water and non-lipophilic organic solvent in the literature, the invention finds that the oleic acid has better capacity of absorbing polar substances and non-polar substances at the same time, which is a key point not found in the prior literature and patents. By utilizing the key point, the oleic acid has higher removal efficiency and better stability on tar model compounds, so that the oleic acid can be directly used for removing biomass gasification tar. Therefore, the method is an improvement in the aspect of resource utilization and popularization of biomass.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The solvent for removing the biomass gasification tar is characterized in that the solvent is oleic acid.
2. The method for removing biomass gasification tar is characterized by comprising the following steps: oleic acid is used as a solvent to absorb biomass gasification tar.
3. The method of claim 2, wherein said step of absorbing biomass gasification tar with oleic acid as a solvent comprises:
heating and vaporizing the biomass gasification tar;
and (3) taking inert gas as carrier gas, and introducing the gasified biomass tar into oleic acid for absorption.
4. The method of claim 3, wherein the oleic acid has a temperature of 20 to 40 ℃.
5. The method of claim 3, wherein said biomass gasification tar is heated to a temperature of 220 ℃ to 250 ℃.
6. The method of claim 2, wherein said biomass gasification tar is contained in a biomass gasification syngas.
7. Application of oleic acid in removing biomass gasified tar.
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| CN102232618A (en) * | 2011-06-24 | 2011-11-09 | 广西工学院 | Absorbent for removing harmful substances in cigarette smoke and smoking device |
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| JP2018030960A (en) * | 2016-08-26 | 2018-03-01 | ザ・カーボン株式会社 | Tar removal method concerning to power generation system of biomass carbonization gas |
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| CN102232618A (en) * | 2011-06-24 | 2011-11-09 | 广西工学院 | Absorbent for removing harmful substances in cigarette smoke and smoking device |
| JP2017222735A (en) * | 2016-06-13 | 2017-12-21 | 国立大学法人東京工業大学 | System and method for pyrolysis or gasification of organic matter, and system and method for purification of generated gas |
| JP2018030960A (en) * | 2016-08-26 | 2018-03-01 | ザ・カーボン株式会社 | Tar removal method concerning to power generation system of biomass carbonization gas |
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