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Method for analyzing melting characteristics of biomass ash

A technology of biomass ash and analysis method, which is applied in the investigation phase/state change, etc., can solve problems such as melting, coal ash melting characteristic evaluation index, and complex biomass ash content, and achieve good repeatability and accuracy.

Active Publication Date: 2016-04-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

[0004] However, no specific evaluation index has been proposed for the process of measuring coal ash melting characteristics by thermomechanical analysis in the existing research.
Moreover, the composition and content of coal ash are significantly different from those of coal ash. The composition and content of biomass ash are relatively complex, and have the characteristics of high content of alkali metals such as potassium, which leads to the occurrence of biomass ash at lower temperatures. melting phenomenon

Method used

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  • Method for analyzing melting characteristics of biomass ash
  • Method for analyzing melting characteristics of biomass ash
  • Method for analyzing melting characteristics of biomass ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 Utilizes thermomechanical analysis to measure the melting characteristics of corn stalk ash (see figure 2 -CS)

[0036] Corn stalks were used as raw materials, crushed and ground through a 1mm sieve; in a muffle furnace, the temperature was raised from room temperature to 250°C at a rate of 5°C / min and maintained for 1 hour, and then continued to rise from 250°C to 550°C and maintained 2hr, the gray sample was prepared; the gray sample was ground and sieved, and the particle size was less than 0.1mm; 50mg of the gray sample was taken for tableting, and put into the test room of the thermomechanical analyzer; Rise from room temperature to 550°C, and then continue to heat up to 1000°C / min at 5°C / min. By analyzing the melting curve, the characteristic temperature is obtained: the sintering characteristic temperature T of corn stalk ash s is 650°C, the characteristic temperature T of the melting stage of corn stalk ash m is 850°C. The characteristic temper...

Embodiment 2

[0037] Embodiment 2 Utilizes thermomechanical analysis to measure the melting characteristics of rice straw ash (see figure 2 -RS)

[0038] Using rice straw as raw material, it was crushed and ground through a 1mm sieve; in a muffle furnace, the temperature was raised from room temperature to 250°C at a rate of 4°C / min and kept for 40 minutes, and then continued to rise from 250°C to 550°C and Keep for 1.5hr to prepare ash sample; grind and sieve the ash sample, the particle size is less than 0.1mm; take 40mg ash sample for tableting, put it into the test room of the thermomechanical analyzer; The heating rate was increased from room temperature to 550°C, and then continued at 2°C / min to 1050°C / min. Through the analysis of the melting curve, the characteristic temperature is obtained: the sintering characteristic temperature T of rice straw ash s is 651°C, the characteristic temperature T of the melting stage of rice straw ash m It is 810°C. The characteristic temperature...

Embodiment 3

[0039] Embodiment 3 Utilizes thermomechanical analysis to measure the melting characteristics of peanut shell ash (see figure 2 -PS)

[0040] Use peanut shells as raw materials, crush and grind them through a 1mm sieve; raise the temperature from room temperature to 250°C at a rate of 6°C / min in a muffle furnace and keep it for 2 hours, then continue to rise from 250°C to 550°C and keep it 3hr to prepare ash sample; grind and sieve the ash sample, the particle size is less than 0.1mm; take 70mg ash sample for tableting, put it into the test room of the thermomechanical analyzer; Rise from room temperature to 550°C, and then continue to heat up to 1250°C / min at 6°C / min. Through the analysis of the melting curve, the characteristic temperature is obtained: the sintering characteristic temperature T of peanut shell ash s is 701°C, the characteristic temperature T of the melting stage of peanut shell ash m It is 865°C. The characteristic temperatures obtained by the pyramid m...

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Abstract

The invention relates to the field of gasifying of biomass energy sources, in particular to a method for analyzing melting characteristics of biomass ash. The method uses a thermal mechanical analyzer to test, and specifically comprises the following steps of preparing a biomass ash sample, testing the melting characteristics of the biomass ash, and analyzing a curve of the melting characteristics of the biomass ash; respectively defining the feature temperature Ts of a biomass ash sintering phase and the feature temperature Tm of a biomass ash melting phase, and utilizing the feature temperatures to analyze and evaluate the melting characteristics of the biomass ash; utilizing the feature temperature Tm to predict the agglomeration flow loss temperature caused by the melting of the biomass ash in the combusting and gasifying processes of a fluidized bed. The method has the advantages that the melting characteristics of the biomass ash in the whole heating process can be continuously observed, and the change caused by the viscosity and temperature characteristics of the biomass ash under high-temperature condition can be presented in the test process, so that when a thermal mechanical analyzing method is used for testing the melting characteristics of the biomass ash, the melting characteristics of the biomass ash can be more objectively and comprehensively reflected; the repeatability is good, and the accuracy is high.

Description

technical field [0001] The invention relates to the field of biomass energy conversion, in particular, the invention relates to a method for analyzing the melting characteristics of biomass ash. Background technique [0002] Biomass energy absorbs CO during its growth 2 Participating in the carbon cycle in the atmosphere can achieve zero emission of greenhouse gases. As a fuel, the sulfur and nitrogen content in biomass is much lower than that of coal and heavy oil, and it is an environmentally friendly renewable and clean energy. As a large agricultural country, my country has an annual output of about 750 million tons of crop straw, which is equivalent to 375 million tons of standard coal; the annual exploitable amount of firewood and forestry waste resources is more than 600 million tons. However, more than 200 million tons of unprocessed crop stalks are directly burned in the field every year, which not only wastes straw resources, but also generates a large amount of h...

Claims

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Application Information

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IPC IPC(8): G01N25/02
CPCG01N25/02
Inventor 郝丽芳马腾宋文立林伟刚李松庚
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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