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Method for measuring spontaneous combustion tendency of biomass pile based on risk index analysis

A technology of hazard index and measurement method, which is applied in the field of biomass pile spontaneous combustion tendency measurement based on hazard index analysis, can solve the problem that it is difficult to fully reflect the characteristics of biomass autothermal oxidation, the actual environment of biomass is not considered, and the adiabatic oxidation method Strict test conditions and other issues to achieve the effects of improved test efficiency, high reliability, and strong tendency to spontaneous combustion

Active Publication Date: 2019-10-08
TAIYUAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Among them, the adiabatic oxidation method has stricter test conditions; the high-temperature activation energy method reflects the oxidative spontaneous combustion characteristics of biomass at higher temperatures, but fails to reflect the oxidative spontaneous combustion process in the low-temperature oxidation stage; The characteristics of biomass, while the adsorption characteristics of biomass are related to its type and pore structure, it is difficult to fully reflect the autothermal oxidation characteristics of biomass
The amount of oxygen absorbed in the temperature-programmed oxidation process is difficult to fully reflect the spontaneous combustion tendency of biomass through passive heating of biomass samples
[0004] The current methods for measuring the spontaneous combustion tendency of biomass piles are to extract biomass samples for experiments, and the spontaneous combustion tendency of biomass is often related to the environment, so the experimental method is not comprehensive and does not take into account the actual environment of biomass

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for determining the tendency of spontaneous combustion of straw particle biomass piles based on hazard index analysis, specifically comprising the following steps:

[0030] 1) At the biomass storage site of straw granules, the air volume V of the storage site measured by an air flow meter is 25ml / min; the maximum particle size of straw granules is B 1 20mm, minimum particle size B 2 is 5mm, and the site temperature K is 20°C.

[0031] 2) Select fresh straw particle biomass on site to remove its surface layer with a knife, crush it under normal temperature and pressure nitrogen protection gas, screen out straw particles with a particle size of 0.125mm~0.15mm, and vacuum-dry them. Treated as experimental samples.

[0032] 3) Take 5g of experimental samples and place them in industrial analyzers and elemental analyzers to measure the volatile A of the samples is 71.1%, the moisture M is 1.94%, the carbon content C is 30.86%, and the hydrogen content H is 2.24%. ...

Embodiment 2

[0038] A method for determining the tendency of spontaneous combustion of pine wood pellet biomass piles based on hazard index analysis, specifically comprising the following steps:

[0039] 1) In the storage workshop of the pine wood pellet biomass manufacturing plant, use relevant instruments to measure the air volume V in the workshop to be 10ml / min, and measure the maximum particle size B of biomass particles 1 15mm, B 2 The minimum particle size is 3mm, and the temperature K is 20°C.

[0040] 2) In the workshop, select fresh pine wood particle biomass to remove its surface layer, crush it under normal temperature and pressure nitrogen protection gas, screen out biomass samples with a particle size of 0.125mm~0.15mm, vacuum dry them, and process them The final biomass samples were used as experimental samples.

[0041] 3) Take 10g of experimental samples and place them in industrial analyzers and elemental analyzers to measure the volatile content of the samples A is 73....

Embodiment 3

[0047] A method for determining the spontaneous combustion tendency of rice bran particle biomass piles based on risk index analysis, specifically comprising the following steps:

[0048] 1) In the outdoor rice bran biomass storage place of the rice bran biomass gasification plant, use relevant instruments to measure the air volume V in the workshop to be 33ml / min, and measure the maximum particle size B of biomass particles 1 6mm, minimum particle size B 2is 3mm, and the temperature K is 30°C.

[0049] 2) Select fresh rice bran from the rice bran biomass pile storage place, crush it under normal temperature and pressure under nitrogen protection gas, screen out rice bran samples with a particle size of 0.125mm~0.15mm, and vacuum-dry them. Rice bran samples were used as experimental samples.

[0050] 3) Take 5g of experimental samples and place them in industrial analyzers and elemental analyzers to measure the volatile A of the samples is 72.04%, the moisture M is 12.14%, t...

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Abstract

The invention, which belongs to the technical field of qualitative and classification of the spontaneous combustion tendency of biomass, discloses a method for measuring the spontaneous combustion tendency of a biomass pile based on a risk index analysis. A wind speed, a temperature, an own particle diameter, a volatile component content, a carbon content, a hydrogen content, a moisture content and a strong oxidant self-heating rising rate of an environment in which a biomass pile is located are measured, a hazard index is calculated, a hazard level table is compared, and the spontaneous combustion tendency of the biomass pile is evaluated comprehensively. With comprehensive consideration of the compositions and environmental factors of the biomass pile, the spontaneous combustion tendencies of the biomass with different types in different environments can be reflected visually; and thus a theoretical support is provided for the fire prevention work of biomass storage sites. Besides, the measurement accuracy of the spontaneous combustion tendency of biomass piles is improved; the operation process is simplified; and the classification criteria are uniform.

Description

technical field [0001] The invention relates to the technical field of qualitative analysis of spontaneous combustion tendency of biomass, in particular to a method for measuring the spontaneous combustion tendency of biomass piles based on risk index analysis. Background technique [0002] With the gradual depletion of fossil energy, global warming, and environmental degradation, people are paying more and more attention to the use of new energy biomass to replace conventional energy. At present, domestic biomass is mostly used in power plants and other industries. Due to the seasonality and low density of biomass itself, a large amount of biomass needs to be stored for long-term use. However, biomass itself has self-heating characteristics. When the heat in the biomass pile is difficult to diffuse to the environment, the temperature will gradually increase, and a fire will occur under certain conditions. Among them, the influencing factors are: composition, environment an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/00
CPCG01N25/00
Inventor 唐一博周晋强
Owner TAIYUAN UNIV OF TECH
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