WO2020140317A1 - Method for calculating volatile component releasing characteristic indices of difficult-to-pyrolyze materials - Google Patents
Method for calculating volatile component releasing characteristic indices of difficult-to-pyrolyze materials Download PDFInfo
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- the invention relates to the technical field of pyrolysis, in particular to a method for calculating the volatile content release index of difficult pyrolysis materials.
- the Volatile Release Characteristics Index reflects the volatile analysis characteristics of the material. The larger the value, the better the volatile analysis characteristics of the material and the easier the pyrolysis reaction.
- the initial precipitation temperature of volatile matter needs to be determined first, and the corresponding weight loss rate of the material should reach 0.1 mg/min; when performing thermogravimetric analysis experiments, the mass of the experimental sample is usually 5 mg, thus The weight loss rate of the material is required to reach 2 wt%/min (wt% means weight percentage).
- coal, biomass wood, peanut husk, rice husk, corn cob
- sludge and other easily pyrolyzed materials their volatile content is high and pyrolysis is easy to occur at high temperature, for example, the volatile content of biomass and other materials
- the content is as high as 70wt%, and the weight loss rate is relatively easy to reach 2wt%/min, so that the volatile content release index can be calculated according to the concept.
- difficult pyrolysis materials with a weight loss rate of less than 2wt%/min during the heating process such as the molding sand widely used in the foundry industry, their volatile content is low and pyrolysis is difficult to occur at high temperatures.
- the present invention provides a method for calculating the volatile content release index of hard-to-pyrolyze materials, which can calculate the volatile content release index of materials, especially hard-to-pyrolyze materials.
- the high performance is conducive to the further analysis of the material pyrolysis characteristics.
- a method for calculating the volatile content release index of difficult-to-pyrolyze materials characterized in that it includes the following steps:
- Step 4 Analyze the remaining mass percentage data at each temperature and the volatile weight loss rate data obtained at each time in steps 1 and 2 to determine the weight loss rate m loss of difficult-to-pyrolyze materials.
- Maximum weight loss rate (dw/dt) max , average volatile weight loss rate (dw/dt) mean and temperature corresponding to the maximum volatile weight loss rate T max , half-peak width ie (dw/dt)/(dw/dt) max The temperature range at 1/2 is ⁇ 1/2 ; where the units of T s , T max and ⁇ 1/2 are °C, and the units of (dw/dt) max and (dw/dt) mean are w
- Step 5 Calculate the volatile release index of refractory materials
- the unit of D is wt% 2 /min 2 /°C 3 .
- the present invention can calculate the volatile content release index of difficult-to-pyrolyze materials, and is also suitable for solving the volatile content release index of general materials, which expands the volatile content release characteristics. Application areas of the index.
- the present invention can provide an idea for the study of the thermal stability of materials by calculating the volatile content release index of difficult-to-pyrolyze materials.
- FIG. 1 is a flowchart of a method for calculating the volatile content release index of a hard-to-pyrolyze material of the present invention
- FIG. 2 is a graph showing the thermal weight loss curves of the foundry sands of steel castings in the first, second, and third embodiments of the method for calculating the volatile content release index of the hard-to-pyrolyze materials of the present invention.
- the object of the present invention is to provide a method for calculating the volatile content release index of hard-to-pyrolyze materials, which can calculate the volatile content release index of materials, especially hard-to-pyrolyze materials. Further analysis of material pyrolysis characteristics.
- FIG. 1 it is a flowchart of a method for calculating the volatile content release index of the hard-to-pyrolyze material of the present invention.
- FIG. 2 it is the thermal weightlessness curve graph of the casting sand of the steel castings in the first, second and third embodiments of the present invention under different heating rates.
- the method for calculating the volatile content release index of the hard-to-pyrolyze material of the present invention includes the following steps:
- Step 5 Calculate the volatile release index of refractory materials
- the weight loss rate of the hard-to-pyrolyze material m loss 0.98%
- the weight loss rate of the hard-to-pyrolyze material m loss 1.36%
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Abstract
A method for calculating volatile component releasing characteristic indices of difficult-to-pyrolyze materials, comprising: first, obtaining residual mass percentage data of a difficult-to-pyrolyze material at each temperature at a certain heating rate, so as to form a thermal weight loss curve; analyzing the thermal weight loss curve to obtain volatile component weight loss rate data at each moment; defining threshold values related to a volatile component initial analysis rate and a weight loss ratio; determining the weight loss ratio and calculating the volatile component initial analysis rate, so as to determine volatile component initial analysis temperature corresponding to the volatile component initial analysis rate, and to determine a volatile component maximum weight loss ratio and a volatile component average weight loss ratio of the difficult-to-pyrolyze material as well as temperature and a half-peak breadth corresponding to the volatile component maximum weight loss ratio; and finally, calculating a volatile component releasing characteristic index of the difficult-to-pyrolyze material according to the above data. The present method is capable of calculating the volatile component releasing characteristic indices of materials, in particular difficult-to-pyrolyze materials, and the method has high calculation result correctness and reliability.
Description
本发明涉及热解技术领域，特别是涉及一种难热解材料的挥发分释放特性指数计算方法。The invention relates to the technical field of pyrolysis, in particular to a method for calculating the volatile content release index of difficult pyrolysis materials.
挥发分释放特性指数反应了材料的挥发分析出特性，其值越大，表明材料的挥发分析出特性越好，热解反应越容易进行。The Volatile Release Characteristics Index reflects the volatile analysis characteristics of the material. The larger the value, the better the volatile analysis characteristics of the material and the easier the pyrolysis reaction.
现有的挥发分释放特性指数计算方法中，需要首先确定挥发分初始析出温度，对应的材料失重速率应达到0.1mg/min；在进行热重分析实验时，实验样品的质量通常为5mg，从而需要材料的失重速率达到2wt％/min(wt％表示重量百分比)。对于煤炭、生物质(木材、花生壳、稻壳、玉米芯)、污泥等易热解材料，其挥发分含量高且在高温状态下容易发生热解，例如，生物质等材料的挥发分含量高达70wt％，其失重速率比较容易达到2wt％/min，从而能够按照概念对其挥发分释放特性指数进行计算。而对于在升温过程中失重速率小于2wt％/min的难热解材料，例如在铸造行业中广泛使用的型砂，其挥发分含量低且在高温状态下很难发生热解，若严格按照概念，将无法计算出其挥发分释放特性指数，从而不能对难热解材料的热解特性进行比较分析。可见，现有的挥发分释放特性指数计算方法不适用于难热解材料，关于难热解材料的挥发分释放特性指数的计算成为一个难题。In the existing calculation method of volatile matter release characteristic index, the initial precipitation temperature of volatile matter needs to be determined first, and the corresponding weight loss rate of the material should reach 0.1 mg/min; when performing thermogravimetric analysis experiments, the mass of the experimental sample is usually 5 mg, thus The weight loss rate of the material is required to reach 2 wt%/min (wt% means weight percentage). For coal, biomass (wood, peanut husk, rice husk, corn cob), sludge and other easily pyrolyzed materials, their volatile content is high and pyrolysis is easy to occur at high temperature, for example, the volatile content of biomass and other materials The content is as high as 70wt%, and the weight loss rate is relatively easy to reach 2wt%/min, so that the volatile content release index can be calculated according to the concept. For the difficult pyrolysis materials with a weight loss rate of less than 2wt%/min during the heating process, such as the molding sand widely used in the foundry industry, their volatile content is low and pyrolysis is difficult to occur at high temperatures. If strictly in accordance with the concept, It is impossible to calculate the index of volatile release characteristics, so that the pyrolysis characteristics of difficult-to-pyrolyze materials cannot be compared and analyzed. It can be seen that the existing calculation method of the volatile matter release characteristic index is not suitable for difficult pyrolysis materials, and the calculation of the volatile matter release characteristic index of the difficult pyrolysis materials becomes a difficult problem.
发明内容Summary of the invention
针对现有技术存在的问题，本发明提供一种难热解材料的挥发分释放特性指数计算方法，能够对材料尤其是难热解材料的挥发分释放特性指数进行计算，计算结果准确性及可靠性高，有利于对材料热解特性的进一步分析。In view of the problems in the prior art, the present invention provides a method for calculating the volatile content release index of hard-to-pyrolyze materials, which can calculate the volatile content release index of materials, especially hard-to-pyrolyze materials. The high performance is conducive to the further analysis of the material pyrolysis characteristics.
本发明的技术方案为：The technical solution of the present invention is:
一种难热解材料的挥发分释放特性指数计算方法，其特征在于，包括下述步骤：A method for calculating the volatile content release index of difficult-to-pyrolyze materials, characterized in that it includes the following steps:
步骤1：获取难热解材料在升温速率为β时每一温度下的剩余质量百分比W，形成热失重曲线W＝f(T)；其中，W为难热解材料的剩余质量百分比，T为温度，T＝β×t，t为难热解材料的加热时间；W、T、β、t的单位分别为wt％、℃、℃/min、min；Step 1: Obtain the remaining mass percentage W of each refractory material at each temperature when the heating rate is β to form a thermal weight loss curve W = f(T); where W is the remaining mass percentage of the refractory material and T is the temperature , T=β×t, t is the heating time of the hard-to-pyrolyze materials; the unit of W, T, β, t is wt%, ℃, ℃/min, min;
步骤2：对难热解材料的热失重曲线进行分析，得到每一时刻的挥发分失重速率dw/dt；其中，w为难热解材料的挥发分质量百分比，w＝1-W，从而dw/dt＝-β×dW/dT，w、dw/dt、 dW/dT的单位分别为wt％、wt％/min、wt％/℃；Step 2: Analyze the thermal weight loss curve of the refractory material to obtain the volatile weight loss rate dw/dt at each moment; where w is the mass percentage of the volatile matter of the refractory material, w=1-W, thus dw/ dt=-β×dW/dT, the unit of w, dw/dt, dW/dT is wt%, wt%/min, wt%/℃, respectively;
步骤3：定义阈值
其中，T
v为难热解材料的挥发分初始析出速率，m
loss为难热解材料的失重率；f的值为定值，用2wt％/min的挥发分初始析出速率与生物质能源的70％的失重率来衡量，从而f＝2.86wt％/min；
Step 3: Define the threshold Among them, T v is the initial precipitation rate of volatile matter of difficult-to-pyrolyze materials, and m loss is the weightlessness rate of refractory material; f is a fixed value, and the initial precipitation rate of volatile matter of 2wt%/min and 70% of biomass energy The weight loss rate is measured, so that f=2.86wt%/min;
步骤4：对所述步骤1和步骤2中得到的每一温度下的剩余质量百分比数据及每一时刻的挥发分失重速率数据进行分析，确定难热解材料的失重率m
loss，计算得到难热解材料的挥发分初始析出速率T
v＝f×m
loss，从而确定当挥发分失重速率dw/dt＝T
v时对应的挥发分初始析出温度T
s，并确定难热解材料的挥发分最大失重速率(dw/dt)
max、挥发分平均失重速率(dw/dt)
mean及挥发分最大失重速率对应的温度T
max、半峰宽即(dw/dt)/(dw/dt)
max＝1/2时的温度区间Δ
1/2；其中，T
s、T
max、Δ
1/2的单位均为℃，(dw/dt)
max、(dw/dt)
mean的单位均为wt％/min；
Step 4: Analyze the remaining mass percentage data at each temperature and the volatile weight loss rate data obtained at each time in steps 1 and 2 to determine the weight loss rate m loss of difficult-to-pyrolyze materials. The initial precipitation rate of the volatiles of the pyrolyzed material T v = f × m loss , so as to determine the corresponding initial precipitation temperature T s of the volatiles when the weight loss rate of the volatiles dw/dt = T v , and determine the volatiles of the refractory materials Maximum weight loss rate (dw/dt) max , average volatile weight loss rate (dw/dt) mean and temperature corresponding to the maximum volatile weight loss rate T max , half-peak width ie (dw/dt)/(dw/dt) max = The temperature range at 1/2 is Δ 1/2 ; where the units of T s , T max and Δ 1/2 are ℃, and the units of (dw/dt) max and (dw/dt) mean are wt%/ min;
步骤5：计算得到难热解材料的挥发分释放特性指数
其中，D的单位为wt％
2/min
2/℃
3。
Step 5: Calculate the volatile release index of refractory materials The unit of D is wt% 2 /min 2 /℃ 3 .
本发明的有益效果为：The beneficial effects of the present invention are:
本发明与现有的挥发分释放特性指数计算方法相比，能够计算出难热解材料的挥发分释放特性指数，也适用于一般材料的挥发分释放特性指数的求解，拓展了挥发分释放特性指数的应用领域。本发明通过计算难热解材料的挥发分释放特性指数，能够为材料热稳定性的研究提供一种思路。Compared with the existing method for calculating the volatile content release index, the present invention can calculate the volatile content release index of difficult-to-pyrolyze materials, and is also suitable for solving the volatile content release index of general materials, which expands the volatile content release characteristics. Application areas of the index. The present invention can provide an idea for the study of the thermal stability of materials by calculating the volatile content release index of difficult-to-pyrolyze materials.
图1为本发明的难热解材料的挥发分释放特性指数计算方法的流程图；1 is a flowchart of a method for calculating the volatile content release index of a hard-to-pyrolyze material of the present invention;
图2为本发明的难热解材料的挥发分释放特性指数计算方法的实施例一、二、三中铸钢件型砂在不同升温速率下的热失重曲线图。2 is a graph showing the thermal weight loss curves of the foundry sands of steel castings in the first, second, and third embodiments of the method for calculating the volatile content release index of the hard-to-pyrolyze materials of the present invention.
下面将结合附图和具体实施方式，对本发明作进一步描述。The present invention will be further described below with reference to the drawings and specific embodiments.
本发明的目的是提供一种难热解材料的挥发分释放特性指数计算方法，能够对材料尤其是难热解材料的挥发分释放特性指数进行计算，计算结果准确性及可靠性高，有利于对材料 热解特性的进一步分析。The object of the present invention is to provide a method for calculating the volatile content release index of hard-to-pyrolyze materials, which can calculate the volatile content release index of materials, especially hard-to-pyrolyze materials. Further analysis of material pyrolysis characteristics.
如图1所示，为本发明的难热解材料的挥发分释放特性指数计算方法的流程图。如图2所示，为本发明的实施例一、二、三中铸钢件型砂在不同升温速率下的热失重曲线图。As shown in FIG. 1, it is a flowchart of a method for calculating the volatile content release index of the hard-to-pyrolyze material of the present invention. As shown in FIG. 2, it is the thermal weightlessness curve graph of the casting sand of the steel castings in the first, second and third embodiments of the present invention under different heating rates.
实施例一Example one
本发明的难热解材料的挥发分释放特性指数计算方法，包括下述步骤：The method for calculating the volatile content release index of the hard-to-pyrolyze material of the present invention includes the following steps:
步骤1：获取难热解材料在升温速率为β时每一温度下的剩余质量百分比W，形成热失重曲线W＝f(T)；其中，W为难热解材料的剩余质量百分比，T为温度，T＝β×t，t为难热解材料的加热时间；W、T、β、t的单位分别为wt％、℃、℃/min、min。Step 1: Obtain the remaining mass percentage W of each refractory material at each temperature when the heating rate is β to form a thermal weight loss curve W = f(T); where W is the remaining mass percentage of the refractory material and T is the temperature , T=β×t, t is the heating time of the hard-to-pyrolyze materials; the units of W, T, β, and t are wt%, ℃, ℃/min, min, respectively.
本实施例一中，难热解材料为铸钢件型砂，升温速率β＝20℃/min，图2中的曲线a为铸钢件型砂在氮气氛围下升温速率β＝20℃/min时的热失重曲线。In the first embodiment, the refractory material is foundry steel casting sand, and the heating rate β=20°C/min. The curve a in FIG. 2 is the heating rate of the foundry steel casting sand under nitrogen atmosphere, β=20°C/min. Thermal weightlessness curve.
步骤2：对难热解材料的热失重曲线进行分析，得到每一时刻的挥发分失重速率dw/dt；其中，w为难热解材料的挥发分质量百分比，w＝1-W，从而dw/dt＝-β×dW/dT，w、dw/dt、dW/dT的单位分别为wt％、wt％/min、wt％/℃。Step 2: Analyze the thermal weight loss curve of the refractory material to obtain the volatile weight loss rate dw/dt at each moment; where w is the mass percentage of the volatile matter of the refractory material, w=1-W, and thus dw/ dt=-β×dW/dT, and the units of w, dw/dt, and dW/dT are wt%, wt%/min, and wt%/°C, respectively.
步骤3：定义阈值
其中，T
v为难热解材料的挥发分初始析出速率，m
loss为难热解材料的失重率；f的值为定值，用2wt％/min的挥发分初始析出速率与生物质能源的70％的失重率来衡量，从而f＝2.86wt％/min。
Step 3: Define the threshold Among them, T v is the initial precipitation rate of volatile matter of difficult-to-pyrolyze materials, and m loss is the weightlessness rate of refractory material; f is a fixed value, and the initial precipitation rate of volatile matter of 2wt%/min and 70% of biomass energy The weight loss rate is measured by f = 2.86wt%/min.
步骤4：对所述步骤1和步骤2中得到的每一温度下的剩余质量百分比数据及每一时刻的挥发分失重速率数据进行分析，确定难热解材料的失重率m
loss＝0.83％，计算得到难热解材料的挥发分初始析出速率T
v＝f×m
loss＝2.37×10
-2wt％/min，从而确定当挥发分失重速率dw/dt＝T
v时对应的挥发分初始析出温度T
s＝152℃，并确定难热解材料的挥发分最大失重速率(dw/dt)
max＝4.54×10
-2wt％/min、挥发分平均失重速率(dw/dt)
mean＝1.56×10
-2wt％/min及挥发分最大失重速率对应的温度T
max＝464℃、半峰宽即(dw/dt)/(dw/dt)
max＝1/2时的温度区间Δ
1/2＝450℃。
Step 4: Analyze the remaining mass percentage data at each temperature and the volatile weight loss rate data at each moment obtained in steps 1 and 2, and determine the weight loss rate of the hard-to-pyrolyze material m loss = 0.83%, Calculate the initial precipitation rate of volatiles of the difficult-to-pyrolyze material T v =f×m loss =2.37×10 -2 wt%/min, so as to determine the corresponding initial precipitation of volatiles when the weight loss rate of volatiles dw/dt=T v Temperature T s = 152 ℃, and determine the maximum weight loss rate of volatiles (dw/dt) max = 4.54×10 -2 wt%/min, the average weight loss rate of volatiles (dw/dt) mean =1.56× 10 -2 wt%/min and the temperature corresponding to the maximum weight loss rate of volatile components T max =464°C, and the half-width is (dw/dt)/(dw/dt) max =1/2 temperature interval Δ 1/2 = 450°C.
步骤5：计算得到难热解材料的挥发分释放特性指数
Step 5: Calculate the volatile release index of refractory materials
实施例二Example 2
本实施例二与上述实施例一的区别在于，升温速率β＝30℃/min，图2中的曲线b为铸钢件型砂在氮气氛围下升温速率β＝30℃/min时的热失重曲线。The difference between the second embodiment and the first embodiment is that the heating rate β=30℃/min, the curve b in FIG. 2 is the thermal weightlessness curve when the casting steel casting sand heating rate β=30℃/min under nitrogen atmosphere .
本实施例二中，难热解材料的失重率m
loss＝0.98％，计算得到难热解材料的挥发分初始析出速率T
v＝f×m
loss＝2.80×10
-2wt％/min，从而确定当挥发分失重速率dw/dt＝T
v时对应的挥发分初始析出温度T
s＝115℃、难热解材料的挥发分最大失重速率(dw/dt)
max＝6.58×10
-2wt％/min、挥发分平均失重速率(dw/dt)
mean＝2.76×10
-2wt％/min及挥发分最大失重速率对应的温度T
max＝473℃、半峰宽即(dw/dt)/(dw/dt)
max＝1/2时的温度区间Δ
1/2＝483℃。计算得到难热解材料的挥发分释放特性指数
In the second embodiment, the weight loss rate of the hard-to-pyrolyze material m loss = 0.98%, and the initial precipitation rate of the volatile matter of the hard-to-pyrolyze material T v = f×m loss = 2.80×10 -2 wt%/min, thus Determine when the weight loss rate of volatiles dw/dt=T v corresponds to the initial precipitation temperature of volatiles T s =115℃, and the maximum weight loss rate of volatiles of difficult-to-pyrolyze materials (dw/dt) max =6.58×10 -2 wt% /min, the average weight loss rate of volatile matter (dw/dt) mean = 2.76×10 -2 wt%/min and the temperature corresponding to the maximum weight loss rate of volatile matter T max = 473℃, the half-width is (dw/dt)/( dw/dt) Temperature range Δ 1/2 = 483°C when max = 1/2 . Calculated volatile release index of refractory materials
实施例三Example Three
本实施例三与上述实施例一的区别在于，升温速率β＝40℃/min，图2中的曲线c为铸钢件型砂在氮气氛围下升温速率β＝40℃/min时的热失重曲线。The difference between the third embodiment and the first embodiment is that the heating rate β=40°C/min, the curve c in FIG. 2 is the thermal weightlessness curve when the casting steel casting sand heating rate β=40°C/min under nitrogen atmosphere .
本实施例三中，难热解材料的失重率m
loss＝1.36％，计算得到难热解材料的挥发分初始析出速率T
v＝f×m
loss＝3.89×10
-2wt％/min，从而确定当挥发分失重速率dw/dt＝T
v时对应的挥发分初始析出温度T
s＝126℃、难热解材料的挥发分最大失重速率(dw/dt)
max＝1.20×10
-1wt％/min、挥发分平均失重速率(dw/dt)
mean＝5.11×10
-2wt％/min及挥发分最大失重速率对应的温度T
max＝492℃、半峰宽即(dw/dt)/(dw/dt)
max＝1/2时的温度区间Δ
1/2＝469℃。计算得到难热解材料的挥发分释放特性指数
In the third embodiment, the weight loss rate of the hard-to-pyrolyze material m loss = 1.36%, and the initial precipitation rate of the volatile matter of the hard-to-pyrolyze material T v = f×m loss = 3.89×10 -2 wt%/min, thus Determine when the weight loss rate of volatiles dw/dt=T v corresponds to the initial precipitation temperature of the volatiles T s =126°C, the maximum weight loss rate of volatiles of difficult-to-pyrolyze materials (dw/dt) max =1.20×10 -1 wt% /min, the average weight loss rate of volatile matter (dw/dt) mean = 5.11×10 -2 wt%/min and the temperature corresponding to the maximum weight loss rate of volatile matter T max = 492℃, the half-width is (dw/dt)/( dw/dt) Temperature range when max = 1/2 = Δ1 /2 = 469°C. Calculated volatile release index of refractory materials
由上述三个实施例可以看出，随着升温速率的增大，铸钢件型砂的挥发分最大失重速率对应的温度T
max与挥发分释放特性指数D均逐渐增大，反应了材料的热解规律。
It can be seen from the above three examples that with the increase of the heating rate, the temperature T max corresponding to the maximum weight loss rate of the volatile matter of the casting steel casting sand and the volatile matter release characteristic index D are gradually increased, reflecting the heat of the material Solution law.
显然，上述实施例仅仅是本发明的一部分实施例，而不是全部的实施例。上述实施例仅用于解释本发明，并不构成对本发明保护范围的限定。基于上述实施例，本领域技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，也即凡在本申请的精神和原理之内所作的所有修改、等同替换和改进等，均落在本发明要求的保护范围内。Obviously, the above-mentioned embodiments are only a part of the embodiments of the present invention, but not all the embodiments. The above embodiments are only used to explain the present invention, and do not constitute a limitation to the protection scope of the present invention. Based on the above embodiments, all other embodiments obtained by those skilled in the art without creative work, that is, all modifications, equivalent replacements, and improvements made within the spirit and principle of the present application, are It falls within the protection scope claimed by the present invention.
Claims (1)
- 一种难热解材料的挥发分释放特性指数计算方法，其特征在于，包括下述步骤：A method for calculating the volatile content release index of difficult-to-pyrolyze materials, characterized in that it includes the following steps:步骤1：获取难热解材料在升温速率为β时每一温度下的剩余质量百分比W，形成热失重曲线W＝f(T)；其中，W为难热解材料的剩余质量百分比，T为温度，T＝β×t，t为难热解材料的加热时间；W、T、β、t的单位分别为wt％、℃、℃/min、min；Step 1: Obtain the remaining mass percentage W of each refractory material at each temperature when the heating rate is β to form a thermal weight loss curve W = f(T); where W is the remaining mass percentage of the refractory material and T is the temperature , T=β×t, t is the heating time of the hard-to-pyrolyze materials; the unit of W, T, β, t is wt%, ℃, ℃/min, min;步骤2：对难热解材料的热失重曲线进行分析，得到每一时刻的挥发分失重速率dw/dt；其中，w为难热解材料的挥发分质量百分比，w＝1-W，从而dw/dt＝-β×dW/dT，w、dw/dt、dW/dT的单位分别为wt％、wt％/min、wt％/℃；Step 2: Analyze the thermal weight loss curve of the refractory material to obtain the volatile weight loss rate dw/dt at each moment; where w is the mass percentage of the volatile matter of the refractory material, w=1-W, thus dw/ dt=-β×dW/dT, the unit of w, dw/dt, dW/dT is wt%, wt%/min, wt%/℃, respectively;步骤3：定义阈值其中，T v为难热解材料的挥发分初始析出速率，m loss为难热解材料的失重率；f的值为定值，用2wt％/min的挥发分初始析出速率与生物质能源的70％的失重率来衡量，从而f＝2.86wt％/min； Step 3: Define the threshold
Among them, T v is the initial precipitation rate of volatile matter of difficult-to-pyrolyze materials, and m loss is the weightlessness rate of refractory material; f is a fixed value, and the initial precipitation rate of volatile matter of 2wt%/min and 70% of biomass energy The weight loss rate is measured, so that f=2.86wt%/min;步骤4：对所述步骤1和步骤2中得到的每一温度下的剩余质量百分比数据及每一时刻的挥发分失重速率数据进行分析，确定难热解材料的失重率m loss，计算得到难热解材料的挥发分初始析出速率T v＝f×m loss，从而确定当挥发分失重速率dw/dt＝T v时对应的挥发分初始析出温度T s，并确定难热解材料的挥发分最大失重速率(dw/dt) max、挥发分平均失重速率(dw/dt) mean及挥发分最大失重速率对应的温度T max、半峰宽即(dw/dt)/(dw/dt) max＝1/2时的温度区间Δ 1/2；其中，T s、T max、Δ 1/2的单位均为℃，(dw/dt) max、(dw/dt) mean的单位均为wt％/min； Step 4: Analyze the remaining mass percentage data at each temperature and the volatile weight loss rate data obtained at each time in steps 1 and 2 to determine the weight loss rate m loss of difficult-to-pyrolyze materials. The initial precipitation rate of the volatiles of the pyrolyzed material T v = f × m loss , so as to determine the corresponding initial precipitation temperature T s of the volatiles when the weight loss rate of the volatiles dw/dt = T v , and determine the volatiles of the refractory materials Maximum weight loss rate (dw/dt) max , average volatile weight loss rate (dw/dt) mean and temperature corresponding to the maximum volatile weight loss rate T max , half-peak width ie (dw/dt)/(dw/dt) max = The temperature range at 1/2 is Δ 1/2 ; where the units of T s , T max and Δ 1/2 are ℃, and the units of (dw/dt) max and (dw/dt) mean are wt%/ min;步骤5：计算得到难热解材料的挥发分释放特性指数其中，D的单位为wt％ 2/min 2/℃ 3。 Step 5: Calculate the volatile release index of refractory materials
The unit of D is wt% 2 /min 2 /℃ 3 .
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