CN105445141B - A kind of method of fast prediction different type stalk biomass constituent content and photosynthetic hydrogen production potentiality - Google Patents
A kind of method of fast prediction different type stalk biomass constituent content and photosynthetic hydrogen production potentiality Download PDFInfo
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Abstract
The invention belongs to the rural energy technical field in agriculture project, a kind of disclose fast prediction different type stalk biomass constituent content and photosynthetic hydrogen production potentiality method.It after different type stalk biomass is crushed respectively, is dispersed in the sample disc of thermogravimetric analyzer, in a nitrogen atmosphere, tests the thermal weight loss behavior of 40 ~ 600 DEG C of temperature ranges under different heating rates；Pyrolysis enlivens section weight-loss ratio WLs‑WLoIt is bigger, residue content is lower, illustrate that the degradable constituent content in the type stalk biomass is higher；Pyrolysis enlivens section weight-loss ratio WLs‑WLoIt is bigger, residue content is lower, apparent activation energy is lower, illustrate that the photosynthetic hydrogen production potentiality of the type stalk biomass are bigger.The method of the present invention, not only realize the rapid comparison of a variety of production hydrogen stalk biomass constituent contents, can also be according to its photosynthetic hydrogen production potentiality of the apparent activation energy numerical prediction being calculated, prediction result is consistent with conclusion in enzymolysis experimental pretreatment and photosynthetic hydrogen production verification test.
Description
Technical field
The invention belongs to the rural energy technical fields in agriculture project, and in particular to a kind of fast prediction different type straw
The method of stalk biolobic material constituent content and photosynthetic hydrogen production potentiality.
Background technology
Fossil energy increasingly exhausted and its force people to develop new cleaning using caused problem of environmental pollution can
The renewable sources of energy are to meet the needs of the future economy and social development.Hydrogen Energy is because energy density is high, burning is pollution-free and utilizes form
It is various and be acknowledged as the following main energy carrier form." hydrogen economy " and " Hydrogen Energy society " for core is used with Hydrogen Energy
Development model is the hope that people use future source of energy technology.
Biological hydrogen production be using microorganism own metabolism release hydrogen process, production hydrogen condition it is mild, it is environmental-friendly and
Raw material sources are abundant and are considered as the fertile main alternative form of the following hydrogen.Different kind organism hydrogen producing technology relatively in, light
Closing bacterium hydrogen manufacturing not only has higher hydrogen production potential, can also realize hydrogen using a variety of organic wastes as production hydrogen feedstock
The hot issue that the double goal with offal treatment can be produced and studied as hydrogen producing technology.Stalk biomass is as three kinds
High polymer：Organic mixture of cellulose, hemicellulose and lignin, the carbohydrate containing 70%-80% can pass through microorganism
Direct or indirect microbe conversion is renewable carbohydrate resource, and is ideal fermentation production by microorganism using production clear energy sources
Hydrogen feedstock.The difference of different type and growing environment can cause the differences of its structure and property, therefore, recovery energy it
Before, it is also necessary to its constituent content and production hydrogen evolution potential are predicted.
The existing method being detected to stalk ingredient has normal form method and Wang Yuwan method etc., is washed using acidity
The detection of method this chemical method progress is washed, operation takes, and influence factor is excessive, and acquired results error is apparent, need to repeatedly weigh
Retrial is tested, and substantially constituent content just can be obtained.Moreover, the cellulose of stalk and the size of hemicellulose level are photosynthetic not with it
Hydrogen production potential is at rigorous positive correlation, and therefore, this just needs a novel, simple and efficient method to be analyzed and predicted.
Invention content
For existing measurement stalk biomass cellulose, hemicellulose and content of lignin technology there are the problem of and
Shortcoming, the purpose of the present invention is to provide a kind of fast prediction different type stalk lifes easy to operate, accuracy is high
The method of material composition content and photosynthetic hydrogen production potentiality, this method can realize the quick determination of preferable photosynthetic hydrogen production raw material.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of method of fast prediction different type stalk biomass constituent content and photosynthetic hydrogen production potentiality, step is such as
Under：
（1）The comminution pretreatment of stalk biomass：Different type stalk biomass is crushed to 375 respectively~
After 8968nm, drying for standby；
（2）Thermogravimetric analysis is carried out to different type stalk biomass：The stalk biomass powder of each type weighs
8~12mg is dispersed in the sample disc of thermogravimetric analyzer, in a nitrogen atmosphere, is tested 40 ~ 600 under different heating rates
The thermal weight loss behavior of DEG C temperature range；
（3）Data analysis：The data processing software packet carried using thermogravimetric analyzer obtains degradation characteristic parameter：Starting
Temperature ToAnd the weight-loss ratio WL at the momento, peak temperature TpAnd the weight-loss ratio WL at the momentp, transition temperature TsAnd the mistake at the moment
Rate WL agains, residue content；Then using the thermal weight loss behavior under each heating rate as foundation, the life of different type stalk is calculated
The apparent activation energy of substance；Predict that the constituent content of different type stalk biomass and photosynthetic hydrogen production are latent according to the data obtained
Power：Pyrolysis enlivens section weight-loss ratio WLs-WLoIt is bigger, residue content is lower, illustrate the easy drop in the type stalk biomass
It is higher to solve constituent content；Pyrolysis enlivens section weight-loss ratio WLs-WLoIt is bigger, residue content is lower, apparent activation energy is lower, say
The photosynthetic hydrogen production potentiality of bright the type stalk biomass are bigger.
The stalk biomass is soybean stalk, broomcorn straw, cotton stalk, maize straw or corncob.
Heating rate is controlled in 5~40 DEG C of min-1Within section.
The apparent activation energy of different type stalk biomass is calculated using FWO or DAEM methods.
Beneficial effects of the present invention：The present invention explores a kind of prediction different type stalk biomass constituent content and light
The method for closing production hydrogen evolution potential not only realizes the rapid comparison of a variety of production hydrogen stalk biomass constituent contents, moreover it is possible to foundation
Its photosynthetic hydrogen production potentiality of the apparent activation energy numerical prediction being calculated, prediction result and enzymolysis experimental pretreatment and photosynthetic production
Conclusion is consistent in hydrogen verification test, and technical support is provided for the preferable photosynthetic hydrogen production raw material of determination.With elemental microanalysis method or
Three plain mensurations are compared, and are greatly reduced the work difficulty for measuring stalk biomass ingredient, are shortened the working time.
Description of the drawings
Fig. 1：10 DEG C of min of heating rate-1When different type stalk biomass powder thermogravimetric curve.
Fig. 2：Ln β and (1/T) * 1000 K in FWO methods-1Relationship.
Fig. 3：Ln β/T in DAEM methods2With (1/T) * 1000 K-1Relationship.
Specific implementation mode
With reference to embodiment, the present invention is described in detail, embodiment under based on the technical solution of the present invention into
Row is implemented, and gives detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following realities
Apply example.
The method of a kind of fast prediction different type stalk biomass constituent contents of embodiment 1-- and photosynthetic hydrogen production potentiality
（1）The comminution pretreatment of stalk biomass：By five kinds of stalk biomass（Maize straw, broomcorn straw, corn
Core, soybean stalk, Cotton Stalk）After being crushed to 1000nm respectively, drying for standby.
（2）Thermogravimetric analysis is carried out to five kinds of stalk biomass：The stalk biomass powder of each type weighs
10mg is dispersed in the open type sample disc of thermogravimetric analyzer；Thermogravimetric analyzer furnace body temperature is cooled to room temperature, High Purity Nitrogen
Gas (99.5v% nitrogen and 0.5v% oxygen) is in flow velocity 60mL min-1Under be passed through in furnace body, create inert atmosphere, click operation, rise
40 ~ 600 DEG C are set as between warm area, heating rate is respectively 5 DEG C of min-1、10℃min-1、20℃min-1、30℃min-1With 40 DEG C
min-1；When reaching 40 DEG C of equalization temperature, Isothermal Condition maintains 1min, after the system stabilizes, start in the case where setting heating rate,
Temperature range is 40 ~ 600 DEG C and carries out heating cooling thermogravimetric analysis process, sampling period 0.5s；Wherein, in 10 DEG C of min-1's
Under heating rate, the thermogravimetric curve TG and first differential thermogravimetric curve (i.e. thermal weight loss of different type stalk biomass powder
Rate curve) DTG is as shown in Figure 1；The pyrolytic process of stalk biomass includes mainly three phases：First stage is volatile
The volatilization divided, second stage are pyrolysis active regions, and the phase III is pyrolysis area of passivity；The degradation of stalk biomass substance collects more
In in pyrolysis active region, and be the degradation of hemicellulose, cellulose and lignin successively；Cellulose and hemicellulose level are got over
Height, then its pyrolysis active region temperature span is bigger；It is low to be pyrolyzed peak temperature, illustrates that the stalk biomass is more degradable；It is weightless
The acromion occurred on curve is then the ratio feelings for illustrating content of cellulose and hemicellulose level in stalk biomass
Condition, acromion is more apparent, illustrates that the ratio between content of cellulose and hemicellulose is lower；Residue content is lower, illustrates that stalk is given birth to
Biodegradable component is more in substance；As shown in Figure 1：Active region is pyrolyzed since 200 DEG C or so of initial temperature, is mainly then at this time
The pyrolysis of hemicellulose, followed by the degradation of cellulose, in 170-350 DEG C of temperature range, acutely degradation causes
It is apparent weightless, and at 320 DEG C or so, weight loss rate reaches peak value, illustrates the thermal decomposition speed of stalk biomass powder at this time
Rate reaches highest；Since the degradation temperature of hemicellulose is lower than cellulose, " acromion " is easily covered by cellulose degradation peak, such as beautiful
Meter Xin and maize straw, therefore be not easy to observe in figure；Phase III is pyrolysis area of passivity, and temperature range is 375-600 DEG C, this
When fast pyrogenation after residue occur slowly decompose, ultimately produce ash content and charcoal；The degradation of lignin is considered the duration
Longest is all slowly sent out such as " tail " that fast pyrogenation reacts in figure in volatile point of volatilization period and pyrolysis active region
It is raw；Pyrolysis starting temperature, peak height, pyrolysis active region span and the residue content of different type stalk are all different.It is fine
Dimension element or hemicellulose level are higher, and during pyrolytic reaction, weight-loss ratio is bigger, and residue content is lower.
（3）Data analysis：The thermogravimetric analyzer that experiment uses has at included TA Universal Analysis data
Software package is managed, necessary measurement function and data analysis function are contained, the degradation of different type stalk biomass powder is special
Property parameter it is as shown in table 1, each parameter value is the average value of five different values obtained under five groups of difference heating rates, ToFor starting
Temperature, WLoFor the weight-loss ratio at the moment；TpFor peak temperature, WLpFor the weight-loss ratio at the moment；TsFor transition temperature, WLsFor this
The weight-loss ratio at moment.
It was found from data in table 1：The degradation characteristic of each stalk biomass is similar, the initial temperature T of degradationo(at this time
Weight-loss ratio WLoFor 2%-4%) it is 197.1 DEG C -237.6 DEG C, broomcorn straw initial temperature is minimum, and the initial temperature of maize straw is most
Height, and maize straw has highest initial temperature weight-loss ratio, illustrates that the degradation of maize straw most easily starts；TpThe temperature of appearance
Section is 317.7oC -335.2 DEG C, at this time biomass powder degrade rapidly, broomcorn straw peak temperature highest, the peak of corncob
It is minimum to be worth temperature, illustrates at a lower temperature, rapid degradation can be realized in corncob；Under peak temperature, the weight-loss ratio of each stalk
From 39.5% to 49.2%, hereafter each powder still keeps high speed to degrade until transition temperature；The T of each biomass powdersIt is 340 ± 6
DEG C, the weight-loss ratio of each powder is about 60% at this time, corncob weight-loss ratio highest, and the size order of the weight-loss ratio of each stalk is：It is beautiful
Rice Xin >Gao Liangjiegan >Yu meter Jie Gan >Great Dou Jiegan >Cotton stalk.Continuous heating sample is to 600 DEG C, the heat of each biomass powder
Solution enlivens section weight-loss ratioWL s -WL o Size order be：Yu meter Xin >Gao Liangjiegan >Yu meter Jie Gan >Great Dou Jiegan >Cotton straw
Stalk；Residue content is differed from 22.9% to 28.9%, and the difference of residue content further explains different powder constituents
It is different；Residue content is followed successively by Yu meter Xin < from small to large;Gao Liangjiegan <Yu meter Jie Gan <Great Dou Jiegan <Cotton stalk；Corn
Core residue content is minimum, illustrates the degradable constituent content highest of corncob, i.e. volatile matter content highest.
During thermogravimetric analysis, initial temperature, peak temperature, pyrolysis active region temperature span, residue content etc. are available
The analysis of stalk biomass thermophysical property is analyzed, estimates its ingredient.And it is with the thermal weight loss behavior under each Elevated Temperature Conditions
Foundation carries out calculating of the different stalk biomass to stalk biomass apparent activation energy, then can be used for characterizing the substance into
The various reaction complexities of row, solve activation energy can help we predict the substance whether be conducive to photosynthetic organism hydrogen generation process into
Row.
It is common non-model dynamic analysis method to calculate equation used by straw biomass apparent activation energy
Flynn-Wall-Ozawa (FWO) and Distributed Activation Energy Model (DAEM) method.FWO methods
It is a kind of integration method, g (α) isIntegrated form.WithIt is rightMapping selects identical under different heating rates
Conversion ratio, thenIt is in a linear relationship with the 1/T at the moment, by fitting gained straight line slope () calculate activation
Energy.Distributed Activation Energy Model (DEAM) method is analysis biological material, such as the common method of agriculture and forestry waste, examines
The relationship between temperature residing for heating rate and specified conversion ratio has been examined, has been with ln β/T2It maps to 1/T, heating rate is different,
Different the time required to reaching differentiated yields, the data obtained is a series of approximately parallel straight lines, according to its slope (- Eα/R )
Solve Eα.The apparent activation energy of difference production hydrogen stalk biomass is different, and the smaller explanation of activation energy makes its inside that molecule occur
The energy that a series of complex such as key fracture, continuous reaction need is minimum, i.e., biochemical reaction most easily occurs.
By taking maize straw as an example, to (5,10,20,30 and 40 DEG C of min under different heating rates-1) reach differentiated yields
Activation energy when (0.1 to 0.9) is calculated.
FWO methods are using ln β as ordinate, with (1/T) * 1000 K-1It maps for abscissa, as shown in Fig. 2, wherein α is
Conversion ratio, β are heating rate, and the value corresponding to variant heating rate is followed successively by each point on each linear line segment respectively, and suitable
Sequence is followed successively by 5 DEG C of min-1For nethermost point, it is then followed successively by 10 DEG C of min-1、20℃ min-1With 30 DEG C of min-1, topmost
Point represent 40 DEG C of min-1The data of gained under heating rate.
DAEM methods are with ln β/T2For ordinate, with (1/T) * 1000 K-1It maps for abscissa, the relational graph of the two is as schemed
Shown in 3, wherein α is conversion ratio, and β is heating rate, and the value corresponding to variant heating rate is followed successively by each linear line segment respectively
On each point, and sequence be followed successively by 5 DEG C of min-1For nethermost point, it is then followed successively by 10 DEG C of min-1、20℃ min-1With 30
℃ min-1, uppermost point represents 40 DEG C of min-1The data of gained under heating rate.
The activation energy of maize straw is as shown in table 2 when calculating gained differentiated yields by FWO and DAEM methods.
With same method, the apparent activation energy of different type stalk biomass is carried out using FWO and DAEM methods
It calculates, show that the average apparent activation of each powder is as shown in table 3.
Average apparent activation numerical value obtained by two methods is close, and has same sequence, Mian Huajiegan >Big beanstalk
Gan >Yu meter Jie Gan >Gao Liangjiegan >Corncob.
Pyrolysis enlivens that section weight-loss ratio is bigger, and residue content is lower, illustrates that its internal biodegradable component content is higher, more
It is easy to be utilized；Apparent activation energy is lower, illustrates that its thermal stability is poorer, easier generation physical-chemical reaction.To sum up, pyrolysis is lived
Jumping, section weight-loss ratio is bigger, residue content is lower, apparent activation energy is lower, and it is bigger to illustrate that it produces hydrogen evolution potential.From aforementioned five type
The pyrolysis of type straw biomass enlivens known to section weight-loss ratio, residue content and apparent activation energy numerical value：The production hydrogen of each stalk
Potentiality sequence is Yu meter Xin >Gao Liangjiegan >Yu meter Jie Gan >Great Dou Jiegan >Cotton stalk, it is wherein degradable contained by corncob
Component content highest, and corncob has best photosynthetic hydrogen production potentiality.
Verify example 1-- enzymolysis experimental pretreatments and photosynthetic hydrogen production verification test
（1）The comminution pretreatment of stalk biomass：By five kinds of stalk biomass（Maize straw, broomcorn straw, corn
Core, soybean stalk, Cotton Stalk）After being crushed to 1000nm respectively, drying for standby；
（2）Enzymolysis pretreatment：Stalk biomass is added to citric acid-citric acid of 150mL pH4.8 after taking 3g to crush
In sodium buffer solution, 200mg cellulases are added, oscillating reactions 50h under the conditions of 50 DEG C, hunting speed 150rpm are obtained instead
Answer feed liquid a；
（3）Photosynthetic bacteria is cultivated：By photosynthetic bacteria Rhodopseudomonas spheroides (Rhodopseudo monas
Phaeroides) in 1.1737 inoculations to growth medium of AS, in 30 DEG C of cultures to growth logarithmic phase；Wherein, made
1.1737 bacterial strains of Rhodopseudomonas spheroides (Rhodopseudo monas phaeroides) AS are in entitled " illuminance
It was disclosed in the journal article of influence to red pseudomonas photosynthetic hydrogen production under the conditions of pig excrement and sewage ",《Journal of Agricultural Engineering》
09 phase in 2005, author：Zhang Junhe, Zhang Quanguo etc.；In addition, in entitled " Hydrogen Production Ability of Rhodobacter sphaeroides with Swine Manure
Experimental study " journal article in be also disclosed,《Agricultural University Of He'nan's journal》02 phase in 2005, author：You Xifeng, it opens
Whole nation etc.；Growth media components are：1g/L NH4Cl、2g/L NaHCO3, 1g/L yeast extracts, 0.2g/L K2HPO4、4g/L
CH3COONa、0.2g/L MgSO4With 2g/L NaCl；
（4）Photosynthetic hydrogen production：With lye reaction material liquid a be adjusted to pH be 6~8, then be added production hydrogen culture medium with component extremely
Producing hydrogen nutrient media components content is：0.4 g/L NH4Cl、0.2 g/L MgCl2, 0.1 g/L yeast extracts, 0.5 g/L K2HPO4、
2 g/L NaCl and 3.56 g/L sodium glutamates, by 200%（v/v）Inoculum concentration inoculation step（3）The photosynthetic bacteria of culture, in
Hydrogen is produced after being kept for 24 hours under the conditions of 30 DEG C of temperature, 3000 lux of intensity of illumination, produces 6~10 days hydrogen duration；Wherein, lye
For the KOH solution of mass concentration 40~50%.
Enzymolysis experimental pretreatment and photosynthetic hydrogen production verification test are carried out by above-mentioned steps, it is as a result as follows：
Enzymolysis pretreatment is carried out by using the stalk biomass of different material type after crushing, each straw after being digested
The reduction candy output of stalk is：Broomcorn straw 470.12mg, maize straw 463.36mg, corncob 1171.94mg, soybean stalk
441.41mg, cotton stalk 397.51mg, conversion coefficient are respectively 18.80%, 18.53%, 46.88%, 17.66%, 15.90%, size
Sequentially it is：Yu meter Xin >Gao Liangjiegan >Yu meter Jie Gan >Great Dou Jiegan >Cotton stalk.As can be seen that the reduction candy output of corncob
And conversion coefficient is significantly larger than other several stalk biomass, therefore for digesting production hydrogen after corncob progress ball milling pretreatment
It is best type of feed.
Photosynthetic organism hydrogen generation, the enzymolysis sugar of corncob are carried out by substrate of the enzymatic saccharification reaction solution of each stalk biomass
The accumulation hydrogen output for changing liquid is far longer than the system for doing substrate with other type of feed stalks, and it is 1088mL that 7d, which accumulates hydrogen output,
Other type of feed accumulation hydrogen output is followed successively by broomcorn straw 347mL, maize straw 342mL, soybean stalk from high to low
321mL, cotton stalk 298mL, this is consistent with the Reducing sugar rule of various type of feed.
Verify example the result shows that：The corncob that thermogravimetry judges through the invention has best photosynthetic hydrogen production
The conclusion of potentiality has maximum reduction candy output and maximum tired with corncob in enzymolysis experimental pretreatment and photosynthetic hydrogen production verification test
Product hydrogen output conclusion is consistent.
Claims (2)
1. a kind of method of fast prediction different type stalk biomass constituent content and photosynthetic hydrogen production potentiality, it is characterised in that
Steps are as follows：
（1）The comminution pretreatment of stalk biomass：Different type stalk biomass is crushed to 375~8968nm respectively
Afterwards, drying for standby；
（2）Thermogravimetric analysis is carried out to different type stalk biomass：The stalk biomass powder of each type, weighing 8~
12mg is dispersed in the sample disc of thermogravimetric analyzer, in a nitrogen atmosphere, tests 40 ~ 600 DEG C of temperature under different heating rates
Spend the thermal weight loss behavior in section；
（3）Data analysis：The data processing software packet carried using thermogravimetric analyzer obtains degradation characteristic parameter：Initial temperature To
And the weight-loss ratio WL at the momento, peak temperature TpAnd the weight-loss ratio WL at the momentp, transition temperature TsAnd the weight-loss ratio at the moment
WLsAnd residue content；Then using the thermal weight loss behavior under each heating rate as foundation, the life of different type stalk is calculated
The apparent activation energy of substance；Predict that the constituent content of different type stalk biomass and photosynthetic hydrogen production are latent according to the data obtained
Power：Pyrolysis enlivens section weight-loss ratio WLs-WLoIt is bigger, residue content is lower, illustrate the easy drop in the type stalk biomass
It is higher to solve constituent content；Pyrolysis enlivens section weight-loss ratio WLs-WLoIt is bigger, residue content is lower, apparent activation energy is lower, say
The photosynthetic hydrogen production potentiality of bright the type stalk biomass are bigger；
Wherein step（1）In stalk biomass type there are five types of, stalk biomass is respectively maize straw, sorghum in five
Stalk, corncob, soybean stalk and Cotton Stalk, after five kinds of stalk biomass are crushed to 1000nm respectively, drying for standby；
Wherein step（2）The detailed process that five kinds of stalk biomass are carried out with thermogravimetric analysis is：The stalk of each type
Biomass powder weighs 10mg, is dispersed in the open type sample disc of thermogravimetric analyzer；Thermogravimetric analyzer furnace body temperature is down to
After room temperature, high pure nitrogen is in flow velocity 60mL min-1Under be passed through in furnace body, create inert atmosphere, click operation, calefactive interzone is set as
40 ~ 600 DEG C, heating rate is respectively 5 DEG C of min-1、10℃min-1、20℃min-1、30℃min-1With 40 DEG C of min-1；When reaching
When 40 DEG C of equalization temperature, Isothermal Condition maintains 1min, after the system stabilizes, start in the case where setting heating rate, temperature range as
40 ~ 600 DEG C carry out heating cooling thermogravimetric analysis process, sampling period 0.5s；Wherein, in 10 DEG C of min-1Heating rate under,
According to the thermogravimetric curve TG and first differential thermogravimetric curve of different type stalk biomass powder, i.e. thermal weight loss rate is bent
Line；The pyrolytic process of stalk biomass includes mainly three phases：First stage is volatile point of volatilization, and second stage is
It is pyrolyzed active region, the phase III is pyrolysis area of passivity；The degradation of stalk biomass substance focuses mostly in pyrolysis active region, and according to
Secondary is the degradation of hemicellulose, cellulose and lignin；Cellulose and hemicellulose level are higher, then it is pyrolyzed active region temperature
Span is bigger；It is low to be pyrolyzed peak temperature, illustrates that the stalk biomass is more degradable；The acromion occurred on weight-loss curve is then
For illustrating the ratio situation of content of cellulose and hemicellulose level in stalk biomass, acromion is more apparent, illustrates fibre
Dimension element is lower with the ratio between the content of hemicellulose；Residue content is lower, illustrates that biodegradable component is more in stalk biomass；
Active region is pyrolyzed since 200 DEG C or so of initial temperature, is mainly then the pyrolysis of hemicellulose at this time, the degradation of cellulose follows closely
Thereafter, in 170-350 DEG C of temperature range, acutely degradation causes apparent weightlessness, and at 320 DEG C or so, weightless speed
Rate reaches peak value, illustrates that the rhermal decomposition rate of stalk biomass powder at this time reaches highest；Due to the degradation temperature of hemicellulose
Degree is lower than cellulose, and " acromion " is easily covered by cellulose degradation peak, therefore is not easy to observe in curve；Phase III is pyrolysis
Area of passivity, temperature range are 375-600 DEG C, and residue after fast pyrogenation occurs slowly to decompose at this time, ultimately produce ash content and
Charcoal；The degradation duration longest of lignin, such as " tail " that fast pyrogenation reacts in curve, in volatile point of volatilization
Stage and pyrolysis active region all slowly occur；The pyrolysis starting temperature of different type stalk, peak height, pyrolysis active region span
And residue content is all different；Cellulose or hemicellulose level are higher, and during pyrolytic reaction, weight-loss ratio is bigger, remaining
Object content is lower.
2. the side of fast prediction different type stalk biomass constituent content as described in claim 1 and photosynthetic hydrogen production potentiality
Method, it is characterised in that：The apparent activation energy of different type stalk biomass is calculated using FWO or DAEM methods.
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