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Method for improving generation of nitrogen-containing volatile HCN from coal under oxygen/fuel combustion condition in CO2 atmosphere

A volatile matter and atmosphere technology, used in special forms of dry distillation, petroleum industry, coke ovens, etc., can solve the problem of lack of nitrogen-containing volatile matter, and achieve the effect of increasing the amount of production, the amount of HCN, and the catalytic effect.

Active Publication Date: 2020-01-14
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies on the effect of calcium addition on the generation of nitrogen-containing volatiles in different pyrolysis atmospheres are lacking in the prior art, especially in CO 2 This is especially true under atmospheric oxygen / fuel combustion conditions

Method used

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  • Method for improving generation of nitrogen-containing volatile HCN from coal under oxygen/fuel combustion condition in CO2 atmosphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A way to improve coal in CO 2 A method for generating nitrogen-containing volatile matter HCN under oxygen / fuel combustion conditions of the atmosphere, the method comprising the following steps:

[0027] (1) Grinding and drying: pulverize the coal powder until the particle size is 100~120, and then dry it with gradient temperature rise to obtain dry fine coal powder. The gradient temperature rise program is as follows: under 0.3 atmospheric pressure, the temperature is raised from 20°C at a rate of 2°C / min After heating to 45°C for 1 hour, continue to raise the temperature from 45°C to 60°C at a rate of 5°C / min, and hold for 8 hours.

[0028] (2) Physical mixing: add a catalytic accelerator containing calcium hydroxide to the dry fine coal powder, the mass of calcium hydroxide in the catalytic accelerator is 1% of the dry fine coal powder, and stir evenly to obtain a pyrolysis standby sample; The catalytic accelerator includes 30 parts by weight of calcium hydroxide, ...

Embodiment 2

[0031] A way to improve coal in CO 2 A method for generating nitrogen-containing volatile matter HCN under oxygen / fuel combustion conditions of the atmosphere, the method comprising the following steps:

[0032](1) Grinding and drying: pulverize the pulverized coal until the particle size is 120~150, and then dry it with gradient temperature rise to obtain dry fine coal powder. The gradient temperature rise program is as follows: Under 0.6 atmospheric pressure, the temperature is raised from 20°C at a rate of 2°C / min After heating to 45°C for 3 hours, continue to raise the temperature from 45°C to 60°C at a rate of 5°C / min, and hold for 12 hours.

[0033] (2) Physical mixing: add a catalytic accelerator containing calcium hydroxide to the dry fine coal powder, the mass of calcium hydroxide in the catalytic accelerator is 3% of the dry fine coal powder, stir well to obtain a pyrolysis standby sample; The catalytic accelerator includes 45 parts by weight of calcium hydroxide, 2...

Embodiment 3

[0036] A way to improve coal in CO 2 A method for generating nitrogen-containing volatile matter HCN under oxygen / fuel combustion conditions of the atmosphere, the method comprising the following steps:

[0037] (1) Grinding and drying: pulverize the pulverized coal until the particle size is 100~200, and then dry it with gradient temperature rise to obtain dry fine coal powder. The gradient temperature rise program is as follows: under 0.5 atmospheric pressure, the temperature is raised from 20°C at a rate of 2°C / min After heating to 45°C for 2 hours, continue to raise the temperature from 45°C to 60°C at a rate of 5°C / min, and hold for 10 hours.

[0038] (2) Physical mixing: add a catalytic accelerator containing calcium hydroxide to the dry fine coal powder, the mass of calcium hydroxide in the catalytic accelerator is 2% of the dry fine coal powder, and stir well to obtain a pyrolysis standby sample; The catalytic accelerator includes 40 parts by weight of calcium hydroxi...

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Abstract

The invention relates to the field of coal industry, and provides a method for improving the generation of nitrogen-containing volatile HCN from coal under the oxygen / fuel combustion condition in a CO2 atmosphere. The method for improving the generation of the nitrogen-containing volatile HCN from the coal under the oxygen / fuel combustion condition in the CO2 atmosphere comprises the following steps that coal powder is crushed uniformly, then heating up and drying are carried out to obtain dry fine coal powder, a catalytic accelerator containing calcium hydroxide components is added to the dryfine coal powder, and the mixture is stirred uniformly to obtain a pyrolysis standby sample; and then the pyrolysis standby sample is subjected to pyrolysis in the CO2 atmosphere, and after the end of the pyrolysis, the nitrogen-containing product HCN in the volatile is analyzed. The defects that the research on the generation of the HCN in the combustion process of the coal in the prior art is performed under inert conditions, and no excessive research exists under the oxygen / fuel combustion condition in the CO2 atmosphere are overcome, the amount of generation of the HCN from the coal underthe oxygen / fuel combustion condition in the CO2 atmosphere is effectively improved, and meanwhile, theoretical support is provided for the effect of the generation of the nitrogen-containing volatileunder the oxygen / fuel combustion condition in the CO2 atmosphere.

Description

technical field [0001] The invention relates to the field of coal industry, a method for improving the CO 2 A method for the formation of nitrogen-containing volatile HCN under oxygen / fuel combustion conditions in the atmosphere. Background technique [0002] Oxy-fuel combustion (oxy-fuel combustion) is a new type of combustion technology. Its basic principle is to separate the oxygen in the air as an oxidant and send it to the furnace for combustion together with the circulating flue gas. The main component of the circulating flue gas is CO 2 , so the gas in the furnace is mainly O 2 and CO 2 Gas, which is different from the traditional air combustion process in which the furnace uses N 2 The main combustion atmosphere is different. Exhaust flue gas CO at the boiler tail 2 The concentration is very high, up to 95% for CO 2 Direct capture of carbon dioxide is a very promising technology for controlling greenhouse gas emissions. [0003] In the oxygen / fuel combustion m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B57/10C10B57/04C10B57/06C10B53/04
CPCC10B53/04C10B57/04C10B57/06C10B57/10
Inventor 顾颖陈宇凡张艳
Owner ZHEJIANG OCEAN UNIV
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