CN107238549B - Method for measuring tar content in gas generated by biomass pyrolysis - Google Patents
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 155
- 239000002028 Biomass Substances 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000007789 gas Substances 0.000 claims abstract description 204
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000002309 gasification Methods 0.000 claims abstract description 6
- 239000010453 quartz Substances 0.000 claims description 35
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 238000010438 heat treatment Methods 0.000 claims description 33
- 239000011261 inert gas Substances 0.000 claims description 21
- 239000000126 substance Substances 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 11
- 238000004817 gas chromatography Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- 238000004587 chromatography analysis Methods 0.000 claims description 3
- 238000007233 catalytic pyrolysis Methods 0.000 claims description 2
- 235000013399 edible fruits Nutrition 0.000 claims description 2
- 238000004868 gas analysis Methods 0.000 claims description 2
- 230000029553 photosynthesis Effects 0.000 claims description 2
- 238000010672 photosynthesis Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 239000010902 straw Substances 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000002737 fuel gas Substances 0.000 abstract description 11
- 239000007788 liquid Substances 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000010903 husk Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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Abstract
The invention relates to a method for measuring tar content in gas generated by biomass pyrolysis. Biomass m of accurate massbiomassPyrolyzing under the set pyrolysis condition to obtain the normal-temperature and normal-pressure gas production volume of the biomass pyrolysis gas, and obtaining the volume V of the pyrolysis gas generated by biomass pyrolysis under the standard condition through conversion0Analytically determining the volume composition y in the pyrolysis gasiCalculating to obtain the gas mass m of the pyrolysis gas generated by the pyrolysis of the corresponding biomassgas(ii) a And obtaining the weight m of the carbon residue after biomass pyrolysisC(ii) a The tar content m was calculated according to the following formulatar：
Description
Technical Field
The invention belongs to the technical field of energy, and particularly relates to a method for measuring tar content in gas generated by biomass pyrolysis.
Background
The content of tar in the biomass gas is an important process index for the protection of a gas generator set and the further deep processing application of the gas, and the measurement accuracy of the content is very important.
At present, the method for measuring the tar content in biomass gas mainly adopts a cold trap method, and the method is that the tar in the gas with the tar is dissolved in an organic solvent through a gas washing bottle which is arranged in an ice bath and is filled with the organic solvent, and the weight of the gas washing bottle before and after gas washing is measured, so that the content of the tar in the corresponding gas can be known. This method has the following problems: when the fuel gas with tar passes through the organic solvent gas washing bottle, the solvent is taken away by the fuel gas in the form of bubbles and vapor pressure, so that the weight of the cold trap gas washing bottle after collecting the tar is lighter than that of the cold trap gas washing bottle before collecting the tar without gas washing, and at the moment, a negative value appears through a difference method, so that the content of the tar corresponding to the fuel gas flow cannot be measured.
Disclosure of Invention
The invention aims to solve the problem that the tar content in the biomass gas is inaccurate to measure and even cannot be measured at present, and develops a method for indirectly measuring the tar content in the gas generated by biomass pyrolysis by using a gravimetric method.
In order to realize the purpose, the invention adopts the following technical scheme:
a method for measuring the content of tar in gas generated by biomass pyrolysis, which is to measure biomass m with accurate massbiomassPyrolyzing under the set pyrolysis condition to obtain the normal-temperature and normal-pressure gas production volume of the biomass pyrolysis gas, and obtaining the volume V of the pyrolysis gas generated by biomass pyrolysis under the standard condition through conversion0Analytically determining the volume composition y in the pyrolysis gasiCalculating to obtain the gas mass m of the pyrolysis gas generated by the pyrolysis of the corresponding biomassgas；
And obtaining the weight m of the carbon residue after biomass pyrolysisC，
The tar content m was calculated according to the following formulatar：
In the formula: m isbiomassIs the biomass mass of the pyrolysis; m isgasThe gas mass of the pyrolysis gas generated by pyrolysis of the corresponding biomass; m isCThe solid carbon residue remained after the pyrolysis of the corresponding biomass; v0Corresponding to the gas volume of the gas produced during pyrolysis of the biomass under standard conditions.
According to the scheme, the mass m of the gas corresponding to the pyrolysis gas generated by biomass pyrolysisgasThe obtaining method comprises the following steps:
gas production volume V from pyrolysis gas of biomass0And corresponding gas componentCalculating the average molecular weight of the pyrolysis gas
Then calculated according to the following formula:
In the formula: m isgasN is the total molar quantity (mol) of the gas generated by the corresponding biomass,average molecular weight (g/mol) of all gases, yiAnd MiThe volume percentage (vol.%) of component i in the gas and its corresponding molar mass (g/mol), respectively, j represents the number of species of gas in the gas component.
V0Corresponding to the gas volume of the pyrolysis gas generated during pyrolysis of biomass under standard conditions.
According to the scheme, the volume composition y in the pyrolysis gasiObtained by analyzing the collected pyrolysis gas by gas chromatography.
According to the scheme, the normal-temperature and normal-pressure gas production volume of the biomass pyrolysis gas is obtained by adopting a drainage method. The method specifically comprises the following steps: the device for measuring the gas production rate of biomass pyrolysis comprises a reaction tube and a cooling device which are sequentially connected through a gas tube, wherein one part of the reaction tube is positioned in a heating device, the outlet of the cooling device is connected with the gas tube, the gas tube at the outlet of the cooling device extends into an inverted gas measuring cylinder, the gas measuring cylinder is provided with scales and is positioned in a water tank, when in measurement, the biomass is positioned in the reaction tube, water is filled in the water tank, and an opening at the bottom of the gas measuring cylinder is sealed by the water in the water tank;
accurately weighing biomass with a certain weight, putting the biomass into a quartz tube for pyrolysis, controlling the heating temperature of a muffle furnace, and putting the biomass into the quartz tube for pyrolysisTemporarily keeping the part of the reaction tube of the substance sample out of the heating zone, after the muffle furnace is heated to reach the specified pyrolysis temperature, passing inert gas into the reaction tube, completely replacing air in the reaction tube, preventing the biomass from being oxidized by the air during pyrolysis, stopping introducing the inert gas after the air in the reaction tube is sufficiently exhausted, pushing the section of the reaction tube containing the biomass sample to be pyrolyzed into the heating zone in the muffle furnace, meanwhile, passing the generated gas through a gas washing cylinder, then introducing into a gas measuring tube which is previously exhausted and filled with water and is inverted in a water tank until no gas is generated, pressing the water level in the gas measuring tube to be consistent with the water tank level outside the gas measuring tube, reading the volume number of the gas measuring tube, namely the normal-temperature and normal-pressure pyrolysis volume of the gas generated by pyrolysis of the corresponding biomass at the specified temperature, the volume number is converted into the volume number under the standard condition through a state equation, namely the volume number V under the standard condition generated after the pyrolysis of the corresponding biomass0Analyzing the volume composition y of the gas component in the measuring gas cylinder by using a gas chromatographic analysis systemi。
According to the scheme, the pyrolysis is anaerobic pyrolysis gasification or catalytic pyrolysis gasification.
According to the scheme, the heating device is an electric furnace, a muffle furnace or other equipment which can be used for heating, and the heating device is used for temperature regulation and control through a temperature controller.
According to the scheme, the reaction tube is a quartz tube.
According to the scheme, the device for measuring the gas production rate of biomass pyrolysis further comprises an inert gas cylinder and a flow meter which are sequentially connected with the reaction tube through a gas pipe.
According to the scheme, the device for measuring the gas production rate of the biomass pyrolysis further comprises a gas analysis system for analyzing the composition of the pyrolysis gas.
According to the scheme, after pyrolysis is finished, the reaction system is cooled to room temperature, the carbon residue after biomass pyrolysis is weighed, and the residual solid carbon residue after corresponding biomass pyrolysis is obtained.
According to the scheme, the biomass is the shell of all plant straws and fruits and the like in the plant which is stored by converting solar energy into chemical energy by utilizing photosynthesis.
The method avoids the problem that the traditional method for directly measuring the weight of the tar causes inaccurate measurement or can not measure the weight, measures the weight of gas and solid generated by pyrolysis of a certain amount of biomass under specified conditions, obtains the weight of the tar generated in the pyrolysis process of the corresponding biomass by a differential method, and can obtain the accurate quality of pyrolysis gas generated by pyrolysis of the biomass and finally ensure the accuracy of the measurement of the content of the tar because the gas amount generated by pyrolysis of the biomass can be accurately collected by a drainage method and the composition of the corresponding gas can be accurately measured by gas chromatography.
The method is realized by putting a small amount of accurately weighed pyrolysis substances into a pyrolysis quartz tube reactor, determining the amount of the pyrolysis substances according to the amount of the gas production per se, and if the amount of the pyrolysis substances is large, the amount of the pyrolysis substances is small, otherwise, the amount of the pyrolysis substances is large, then putting the quartz tube into a muffle furnace, temporarily keeping the part of the biomass sample put in the muffle furnace out of a heating area, starting the muffle furnace, controlling the temperature by a temperature control instrument, starting to introduce inert gas to completely replace the air in the quartz tube after the muffle furnace is heated to reach a specified pyrolysis temperature, preventing the biomass from being oxidized by the air during pyrolysis, stopping the introduction of the inert gas after the air is exhausted, pushing the section of the quartz tube with the pyrolysis substance sample into a heating constant temperature area in the muffle furnace, simultaneously introducing the generated gas into a gas measuring tube which is previously discharged with air filled with water and is inverted in a water tank until no gas is generated, the water liquid level in the gas measuring pipe is kept consistent with the liquid level of the water tank outside the gas measuring pipe, the pressure state of gas in the gas measuring pipe is ensured to be the same as the external atmospheric pressure, the volume in the gas measuring pipe is room temperature and normal pressure gas production generated by corresponding pyrolysis substances at the appointed pyrolysis temperature, and the temperature of the section of quartz tube reactor containing the pyrolysis biomass sample is basically unchanged when the section of quartz tube reactor is pushed into a muffle furnace for heating due to the small amount of the biomass sample and the large heat capacity of the muffle furnace, so that the gas production of the pyrolysis substances is the gas production of the appointed pyrolysis temperature, and the solubility of gas generated by pyrolysis of the biomass at the appointed temperature in water can be almost ignored, therefore, the measured pyrolysis gas production is very accurate and is consistent with the actual industrial process.
After the tasks are completed, the quartz tube reactor in the muffle furnace is cooled to room temperature, carbon residue obtained after biomass pyrolysis in the reactor is weighed, and gas collected by a drainage method is analyzed for composition through gas chromatography, so that the tar content in fuel gas generated by biomass pyrolysis can be measured through an indirect calculation method.
The invention has the beneficial effects that:
the method has the advantages that the measurement of the tar content in the fuel gas has important significance for protecting subsequent equipment (such as a generator set) and determining and using the catalyst amount in the process, and the tar content in the fuel gas generated in the biomass pyrolysis or gasification process can be accurately measured by adopting the method, so that a wide prospect is opened for the development and utilization of the biomass and the improvement of the added value of the biomass.
Drawings
FIG. 1 is a schematic view of a device used in the method for measuring the tar content in biomass gas of the present invention, wherein: 1 inert gas cylinder, 2 rotameter, 3 quartz tube, 4 muffle furnace, 5 pyrolytic substance, 6 heating device temperature control instrument, 7 ice bath gas washing cylinder, 8 water tank, 9 gas cylinders, 10 gas chromatography system.
The specific implementation mode is as follows:
the working process of the invention is described below with reference to the drawings and the embodiments.
Example 1
2.0293 chaff is accurately weighed and placed into a pyrolytic quartz tube 3, then the quartz tube 3 is placed into a muffle furnace 4, the part of the sample 5 of the pyrolysis substance is temporarily not in a heating area, the heating temperature of the muffle furnace is controlled by a heating device temperature control instrument 6, after the muffle furnace is heated to reach the specified pyrolysis temperature, inert gas in an inert gas bottle 1 is passed into the quartz tube 3, and appropriate flow is controlled by a rotor flowmeter 2, so that the air in the quartz tube 3 is replaced by inert gas nitrogen, the biomass is prevented from being oxidized by the air during pyrolysis, after the air in the quartz tube 3 is completely removed, the introduction of the inert gas is stopped,then pushing the section of the quartz tube with the biomass sample to be pyrolyzed into a heating zone in a muffle furnace 4, meanwhile, introducing the generated gas into a measuring gas cylinder 9 which is filled with water and is inverted in a water tank 8 after the generated gas passes through an ice-bath gas washing cylinder 7 until no gas is generated, stopping heating and cooling the muffle furnace to room temperature, and accurately weighing the weight of the residual carbon after the biomass is pyrolyzed in the quartz tube reactor; then the liquid level in the gas measuring cylinder is pressed to be consistent with the liquid level of the water tank 8 outside the gas measuring cylinder, the volume number in the gas measuring cylinder 9 is read, namely the volume amount of the normal-temperature and normal-pressure gas generated by pyrolysis of the corresponding pyrolysis biomass 5 at the specified temperature is converted into the volume number under the standard condition through a state equation, namely the volume number V under the standard condition generated after pyrolysis of the corresponding biomass0Analyzing the volume composition y of the gas component in the measuring cylinder with the gas chromatography system 10iAnd after pyrolysis is finished, cooling the quartz tube reactor in the muffle furnace to room temperature, and weighing carbon residue obtained after biomass pyrolysis in the reactor.
Table I shows the gas yield of husk subjected to anaerobic pyrolysis at 600 ℃, the amount of carbon residue after pyrolysis, the volume of gas in a measuring cylinder and the chromatographic analysis of the components thereof, as shown in Table 1 below,
according to the data in the table, the tar content in the fuel gas generated by the chaff pyrolysis at the temperature of 600 ℃ can be indirectly calculated to be 1393g/Nm3。
TABLE-determination of the Tar content in the Fuel gas produced by anaerobic pyrolysis of chaff at 600 deg.C
Example 2
2.0247 chaff is accurately weighed and put into a quartz tube 3 for pyrolysis, then the quartz tube 3 is put into a muffle furnace 4, and the part of the sample 5 for pyrolysis material is temporarily not in a heating zone, and is loaded by heatingThe temperature control instrument 6 is arranged to control the heating temperature of the muffle furnace, after the heating of the muffle furnace reaches the specified pyrolysis temperature, the inert gas in the inert gas bottle 1 is passed into the quartz tube 3, and the proper flow rate is controlled by the rotameter 2, so as to replace the air in the quartz tube 3 with inert gas nitrogen to be clean and prevent the biomass from being oxidized by the air during pyrolysis, and after the air in the quartz tube 3 is completely removed, the introduction of the inert gas is stopped, then the section of the quartz tube with the biomass sample to be pyrolyzed is pushed into a heating zone in the muffle furnace 4, at the same time, the generated gas passes through an ice bath gas washing bottle 7, and then is introduced into a gas measuring pipe 9 which is filled with water and is inverted in a water tank 8 after the air is discharged, until no gas is generated, stopping heating and cooling the muffle furnace to room temperature, and accurately weighing the weight of the residual carbon after biomass pyrolysis in the quartz tube reactor; then the liquid level in the gas measuring cylinder is pressed to be consistent with the liquid level of the water tank 8 outside the gas measuring cylinder, the volume number in the gas measuring cylinder 9 is read, namely the volume amount of the normal-temperature and normal-pressure gas generated by pyrolysis of the corresponding pyrolysis biomass 5 at the specified temperature is converted into the volume number under the standard condition through a state equation, namely the volume number V under the standard condition generated after pyrolysis of the corresponding biomass0Analyzing the volume composition y of the gas component in the measuring cylinder with the gas chromatography system 10iThe first table shows the gas yield, the amount of carbon residue after pyrolysis, the volume of gas in a measuring cylinder and the chromatographic component analysis of the gas yield when the husk is pyrolyzed under 700 ℃ in the absence of oxygen, as shown in the following table 2, and the tar content in the gas produced by pyrolyzing the husk at 700 ℃ can be indirectly calculated to be 1103g/Nm according to the data in the table3。
TABLE 2 determination of the Tar content of the Fuel gas produced by anaerobic pyrolysis of chaff at 700 deg.C
Example 3
2.0347 chaff is accurately weighed and put into a quartz tube 3 for pyrolysis, and then the quartz tube 3 is put into a muffle furnace 4, and the part of the sample 5 for pyrolysis is temporarily not in a heating zone,the heating temperature of the muffle furnace is controlled by a heating device temperature control instrument 6, after the heating of the muffle furnace reaches the specified pyrolysis temperature, the inert gas in the inert gas cylinder 1 is passed into the quartz tube 3, and the proper flow rate is controlled by the flow meter 2, so as to replace the air in the quartz tube 3 with inert gas nitrogen to be clean and prevent the biomass from being oxidized by the air during pyrolysis, and after the air in the quartz tube reactor 3 is driven out, the introduction of the inert gas is stopped, then the section of the quartz tube with the biomass sample to be pyrolyzed is pushed into a heating zone in a muffle furnace, at the same time, the generated gas passes through an ice bath gas washing bottle 7, and then is introduced into a gas measuring pipe 9 which is filled with water and is inverted in a water tank 8 after the air is discharged, until no gas is generated, stopping heating and cooling the muffle furnace to room temperature, and accurately weighing the weight of the residual carbon after biomass pyrolysis in the quartz tube reactor; then the liquid level in the gas measuring cylinder is pressed to be consistent with the liquid level of the water tank 8 outside the gas measuring cylinder, the volume number in the gas measuring cylinder 9 is read, namely the volume amount of the normal-temperature and normal-pressure gas generated by pyrolysis of the corresponding pyrolysis biomass 5 at the specified temperature is converted into the volume number under the standard condition through a state equation, namely the volume number V under the standard condition generated after pyrolysis of the corresponding biomass0Analyzing the volume composition y of the gas component in the measuring cylinder with the gas chromatography system 10iThe first table shows the gas yield, the amount of carbon residue after pyrolysis, the volume of gas in a measuring cylinder and the chromatographic component analysis of the gas yield when the chaff is pyrolyzed in the absence of oxygen at 800 ℃ as shown in the following table 1, and the tar content in the gas produced by pyrolyzing the chaff at 800 ℃ is 857g/Nm calculated indirectly according to the data in the table3。
TABLE 3 determination of the Tar content of the Fuel gas produced by anaerobic pyrolysis of chaff at 800 deg.C
Claims (8)
1. A method for measuring the tar content in gas generated by biomass pyrolysis is characterized by comprising the following steps: biomass m of accurate massbiomassPyrolyzing under the set pyrolysis condition to obtain the normal-temperature and normal-pressure gas production volume of the biomass pyrolysis gas, and obtaining the volume V of the pyrolysis gas generated by biomass pyrolysis under the standard condition through conversion0Analytically determining the volume composition y in the pyrolysis gasiCalculating to obtain the gas mass m of the pyrolysis gas generated by the pyrolysis of the corresponding biomassgas；
And obtaining the weight m of the carbon residue after biomass pyrolysisC；
The tar content m was calculated according to the following formulatar：
In the formula: m isbiomassIs the biomass mass of the pyrolysis; m isgasThe gas mass of the pyrolysis gas generated by pyrolysis of the corresponding biomass; m isCThe solid carbon residue remained after the pyrolysis of the corresponding biomass; v0The gas volume under standard conditions of the gas generated when biomass is pyrolyzed;
the volume number V corresponding to the standard condition generated after biomass pyrolysis0The normal-temperature and normal-pressure gas production volume of the obtained pyrolysis gas generated by pyrolysis is obtained by converting a state equation;
the normal-temperature and normal-pressure gas production volume of the biomass pyrolysis gas is obtained by a drainage method; the method for measuring the normal-temperature and normal-pressure gas production volume of the biomass pyrolysis gas by the drainage method comprises the following steps:
the device for measuring the gas production rate of biomass pyrolysis comprises a reaction tube and a cooling device which are sequentially connected through a gas tube, wherein one part of the reaction tube is positioned in a heating device, the outlet of the cooling device is connected with the gas tube, the gas tube at the outlet of the cooling device extends into an inverted gas measuring cylinder, the gas measuring cylinder is provided with scales and is positioned in a water tank, when in measurement, the biomass is positioned in the reaction tube, water is filled in the water tank, and an opening at the bottom of the gas measuring cylinder is sealed by the water in the water tank;
accurately weighing biomass in a certain weight, putting the biomass into a pyrolytic quartz tube, controlling the heating temperature of a muffle furnace, and putting the biomass into the furnaceTemporarily keeping the part of the reaction tube for decomposing the substance sample out of the heating area, after the muffle furnace is heated to reach the specified pyrolysis temperature, passing inert gas into the reaction tube, completely replacing air in the reaction tube, preventing the biomass from being oxidized by the air during pyrolysis, stopping introducing the inert gas after the air in the reaction tube is sufficiently discharged, pushing the section of the reaction tube in which the biomass sample to be pyrolyzed is placed into the heating area in the muffle furnace, meanwhile, passing the generated gas through a gas washing cylinder, then introducing into a gas measuring tube which is previously discharged with air and filled with water and is inverted in a water tank until no gas is generated, pressing the water level in the gas measuring tube to be consistent with the water level of the water tank outside the gas measuring tube, reading the volume number of the gas measuring tube, namely the normal-temperature and normal-pressure pyrolysis volume of the gas generated by pyrolysis of the corresponding biomass at the specified temperature, then the volume is converted into the volume under standard conditions through a state equation, namely the volume V under the standard conditions generated after the pyrolysis of the corresponding biomass0Analyzing the volume composition y of the gas component in the measuring gas cylinder by using a gas chromatographic analysis systemi。
2. The method for determining the tar content in the gas generated by the pyrolysis of biomass according to claim 1, characterized in that: the mass m of the gas corresponding to the pyrolysis gas generated by biomass pyrolysisgasThe obtaining method comprises the following steps:
gas production volume V from pyrolysis gas of biomass0And calculating the average molecular weight of the pyrolysis gas according to the volume percentage of the corresponding gas component
Then, the formula is calculated according to the following formula, wherein:
while
In the formula: m isgasN is the total molar quantity of the gas generated by the biomass correspondingly,
average molecular weight of all gases, yiAnd MiRespectively the volume percentage of the component i in the gas and the corresponding molar mass, and j represents the number of the types of the gas in the gas component;
V0corresponding to the gas volume of the pyrolysis gas generated during pyrolysis of biomass under standard conditions.
3. The method for determining the tar content in the gas generated by the pyrolysis of biomass according to claim 2, characterized in that: volume composition y in the pyrolysis gasiObtained by analyzing the collected pyrolysis gas by gas chromatography.
4. The method for determining the tar content in the gas generated by the pyrolysis of biomass according to claim 1, characterized in that: the heating device is an electric furnace or a muffle furnace, and the temperature of the heating device is regulated and controlled by a temperature controller;
the reaction tube is a quartz tube;
the device for measuring the gas production rate of biomass pyrolysis further comprises an inert gas cylinder and a flow meter which are connected with the reaction tube in sequence through a gas pipe.
5. The method for determining the tar content in the gas generated by the pyrolysis of biomass according to claim 1, characterized in that: the device for measuring the gas production rate of the biomass pyrolysis also comprises a gas analysis system for analyzing the composition of the pyrolysis gas.
6. The method for determining the tar content in the gas generated by the pyrolysis of biomass according to claim 1, characterized in that: and after the pyrolysis is finished, cooling the reaction system to room temperature, and weighing the carbon residue obtained after the biomass pyrolysis to obtain the residual solid carbon residue obtained after the corresponding biomass pyrolysis.
7. The method for determining the tar content in the gas generated by the pyrolysis of biomass according to claim 1, characterized in that: the biomass is the shell which converts solar energy into chemical energy by utilizing photosynthesis and stores all plant straws and fruits in the plant.
8. The method for determining the tar content in the gas generated by the pyrolysis of biomass according to claim 1, characterized in that: the pyrolysis is anaerobic pyrolysis gasification or catalytic pyrolysis gasification.
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| 生物质多级高温气化定向制备合成气的特性研究;陈超;《中国博士学位论文全文数据库 工程科技II辑》;20150515(第05期);39-44 * |
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