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Method for evaluating strength of ashes with different residual carbon content in coal gasification

A technology of residual carbon content and coal gasification, applied in the field of coal gasification, can solve the problems of insufficient burning slag and inability to simulate actual production, and achieve the effect of improving the strength of ash slag

Inactive Publication Date: 2020-05-01
中安联合煤化有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing mechanical characterization of residual carbon in ash is made by adding pure graphite to the ash for slag production, and then testing the shear force of the slag sample. This addition method has insufficient slag and cannot simulate actual production, etc. Insufficient, and there is no method in the prior art to characterize the strength of ash by detecting the compressive strength of ash with different carbon content

Method used

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  • Method for evaluating strength of ashes with different residual carbon content in coal gasification
  • Method for evaluating strength of ashes with different residual carbon content in coal gasification
  • Method for evaluating strength of ashes with different residual carbon content in coal gasification

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Embodiment 1

[0034] A method for evaluating the strength of ash with different residual carbon content in coal gasification, using a high-temperature tube furnace to simulate a reducing atmosphere, the total flow rate of the reducing atmosphere is 200ml / min, in which CO and N 2 The flow ratio is 4:6. The experiments were performed with 0% pulverized coal (coal of the same ash) added to the ash sample.

[0035] S1: First, take an appropriate amount of coal with a high ash melting point (FT>1500°C) and spread it evenly in the ash dish, put the ash dish into the constant temperature zone of the muffle furnace where the furnace temperature does not exceed The temperature was slowly raised to 500°C, and kept at this temperature for 30 minutes, then continued to rise to 815°C, and burned at this temperature for 1 hour.

[0036] S2: Take out the burnt ash, cool it in the air for about 5 minutes, move it into a desiccator to cool to room temperature, take out the sample and seal it to get the ash...

Embodiment 2

[0041] A method for evaluating the strength of ash with different residual carbon content in coal gasification, using a high-temperature tube furnace to simulate a reducing atmosphere, the total flow rate of the reducing atmosphere is 200ml / min, in which CO and N 2 The flow ratio is 4:6. The experiment was carried out by adding 1% pulverized coal (coal of the same ash) to the ash sample.

[0042] S1: First, take an appropriate amount of coal with a high ash melting point (FT>1500°C) and spread it evenly in the ash dish, put the ash dish into the constant temperature zone of the muffle furnace where the furnace temperature does not exceed The temperature was slowly raised to 500°C, and kept at this temperature for 30 minutes, then continued to rise to 815°C, and burned at this temperature for 1 hour.

[0043] S2: Take out the burned ash, cool it in the air for about 5 minutes, move it into a desiccator to cool to room temperature, take out the sample and seal it to get the ash...

Embodiment 3

[0048] A method for evaluating the strength of ash with different residual carbon content in coal gasification, using a high-temperature tube furnace to simulate a reducing atmosphere, the total flow rate of the reducing atmosphere is 200ml / min, in which CO and N 2 The flow ratio is 4:6. The experiment was carried out by adding 5% pulverized coal (coal of the same ash) to the ash sample.

[0049] S1: First, take an appropriate amount of coal with a high ash melting point (FT>1500°C) and spread it evenly in the ash dish, put the ash dish into the constant temperature zone of the muffle furnace where the furnace temperature does not exceed The temperature was slowly raised to 500°C, and kept at this temperature for 30 minutes, then continued to rise to 815°C, and burned at this temperature for 1 hour.

[0050] S2: Take out the burnt ash, cool it in the air for about 5 minutes, move it into a desiccator to cool to room temperature, take out the sample and seal it to get the ash ...

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Abstract

The invention discloses a method for evaluating the strength of ashes with different residual carbon content in coal gasification. The method comprises the following steps of (S1) spreading high-ash-fusion coal into a cupel evenly and feeding the cupel into a constant temperature zone of a muffle furnace; (S2) warming the cupel to 450-550 DEG C in the muffle furnace, keeping the cupel at the temperature for 20-40min, further warming the cupel to 800-830 DEG C and firing the cupel at the temperature for 40-80min; (S3) taking out the ashes, cooling the ashes in the air for 4-6min and then transferring the ashes into a dryer to cool to room temperature; (S4) adding powdered coal into the ashes and mixing the powdered coal with the ashes evenly; (S5) putting the ashes into small corundum dishes, putting a plurality of small corundum dishes on a corundum boat and then pushing the corundum boat into a tube furnace; (S6) warming and heating the corundum boat in the step (S5) in reducing atmosphere; (S7) quickly taking out the corundum boat in the step (S6) for quenching; and (S8) putting the ashes quenched in the step (S7) into a drying oven for drying to obtain high-temperature ash samples. According to the method disclosed by the invention, the influence of the residual carbon content on the strength of the ashes in an actual industrial production process can be theoretically guided.

Description

technical field [0001] The invention relates to the technical field of coal gasification, in particular to a method for evaluating the strength of ash with different residual carbon content in coal gasification. Background technique [0002] my country discharges about 300-600 million tons of coal gasification ash every year, and the ash will cause slag blocking of the equipment during the operation of the gasifier, causing serious economic losses. Due to the difference of coal gasification process, some residual carbon will be contained in the ash residue, and the existence of different residual carbon content has a great influence on the strength of the ash residue. At present, most of the studies on the presence of residual carbon in ash are focused on the ash produced by boilers, that is, the atmosphere is an oxidizing atmosphere, and there are few studies on the different carbon content in ash produced under a reducing atmosphere. Therefore, understanding the influence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/44
CPCG01N1/28G01N1/44G01N2203/0298
Inventor 李寒旭陶全保窦媛媛胡小平华桂义何军
Owner 中安联合煤化有限责任公司