Coal pyrolysis reaction thermal testing method based on heat flow type DSC technique

A technology of coal pyrolysis and reaction heat, which is applied in the direction of material heat development, can solve the problems of inconvenient and reliable measurement of coal pyrolysis reaction heat, etc., and achieve the effect of continuous measurement process and simple calculation process

Active Publication Date: 2017-05-31
CHNA ENERGY INVESTMENT CORP LTD +1
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AI Technical Summary

Problems solved by technology

The method is suitable for measuring the heat of coal pyrolysis reaction under the condition of open crucible and covered crucible; it can also solve the problem that the heat of coal pyrolysis reaction cannot be measured conveniently and reliably under the condition of using an open crucible

Method used

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  • Coal pyrolysis reaction thermal testing method based on heat flow type DSC technique
  • Coal pyrolysis reaction thermal testing method based on heat flow type DSC technique
  • Coal pyrolysis reaction thermal testing method based on heat flow type DSC technique

Examples

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preparation example Construction

[0032] (A) Preparation and analysis of air-dried coal and coke samples

[0033] According to the present invention, the coal is air-dried, implemented according to GB474-2008; the pyrolysis conditions include: the nitrogen flow rate is 100mL / min, the heating rate is 5°C / min, the final pyrolysis temperature is 1100°C, and the constant temperature time is 60 min; the air-dried coal sample and the coke sample were subjected to the industrial analysis according to GB / T212-2008, and the elemental analysis according to GB / T476-2001.

[0034] Specifically, the following steps may be included:

[0035] i) Take a fresh coal sample and crush it until the particle diameter is less than 0.074mm, and air-dry the coal sample according to the provisions of GB474-2008 to prepare an air-dried coal sample with a particle diameter of less than 0.074mm;

[0036] ii) Put 5g of air-dried coal sample into an open quartz boat and place it in a tube furnace for pyrolysis. Before pyrolysis, the furn...

Embodiment 1

[0137] This example illustrates the method for measuring the reaction heat of coal pyrolysis under open crucible conditions based on the heat flow DSC technology of the present invention.

[0138] (1) Sample preparation and analysis: Take the Inner Mongolia Shengli lignite sample, crush it to a particle size of less than 0.074mm, and then perform air drying according to the provisions of GB474-2008 to make an air-dried coal sample with a particle size of less than 0.074mm; take 5g of air The dried coal sample was placed in an open quartz boat and then placed in a tube furnace for pyrolysis. During pyrolysis, the flow rate of carrier gas (high-purity nitrogen gas) was 100 mL / min, the heating rate was 5 °C / min, and the final pyrolysis temperature was 1100°C, the constant temperature time is 60 minutes, and the furnace tube is purged with carrier gas for 30 minutes before pyrolysis to remove residual oxygen; according to the provisions of GB / T212-2008 and GB / T476-2001, air-dried c...

Embodiment 2

[0158] This example illustrates the method for measuring the reaction heat of coal pyrolysis under open crucible conditions based on the heat flow DSC technology of the present invention.

[0159] Take the Shaanxi Shenmu bituminous coal sample, carry out sample preparation and analysis according to the method in Example 1, measure heat flow and weight loss data, and calculate the normalized reaction heat flow and normalized reaction heat of coal.

[0160] The basic parameters required for the calculation process (including some industrial analysis and elemental analysis data of air-dried coal samples and coke samples, as well as related quality data) are shown in Table 3. See Table 4 for the combined equation and the temperature equation of the radiation correction factor λ in different temperature ranges. The normalized reaction heat flow curve and normalized reaction heat curve of Shenmu bituminous coal are shown in Figure 4 , Figure 5 shown.

[0161] table 3

[0162] ...

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Abstract

The invention discloses a coal pyrolysis reaction thermal testing method based on a heat flow type DSC technique. The coal pyrolysis reaction thermal testing method comprises the following steps: continuously testing heat flow and weight loss data of dry basis coal pyrolysis process and coke pyrolysis process by using a synchronous thermal analyzer, and calculating with the combination of industrial analysis and element analysis data of an air dried coal sample and a coke sample, thereby obtaining normalization reaction heat flow and normalization reaction heat of coal at different temperatures. By adopting the coal pyrolysis reaction thermal testing method, the testing process is implemented continuously and automatically, the calculation process is simple, convenient and scientific, and the coal pyrolysis reaction heat can be conveniently and reliably tested under conditions of opened crucibles and covered crucibles.

Description

technical field [0001] The invention relates to a coal pyrolysis reaction heat measurement method based on heat flow type DSC technology. Background technique [0002] Coal pyrolysis is not only the initial and accompanying reaction process of coal combustion, gasification, direct liquefaction and other processes, but also one of the main processes for the conversion and utilization of coal (especially low-rank coal), which can obtain gas (coal gas), liquid ( tar), solid (semi-coke or coke) fuels and / or chemical raw materials. [0003] The reaction heat generated during coal pyrolysis (coal pyrolysis reaction heat) is an important thermodynamic parameter required for reactor design, process simulation, reaction mechanism research, energy consumption assessment, and process optimization. Coal composition and its pyrolysis reaction system are extremely complex, and it is impossible to obtain coal pyrolysis reaction heat data through theoretical calculations. The determinatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/48
Inventor 何璐解强霍卫东仝胜录张香兰郭治曹俊雅郜丽娟张军
Owner CHNA ENERGY INVESTMENT CORP LTD
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