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Calcium-based potassium-magnesium-silicon composite additive for improving the high-temperature sulfur fixation effect of civil coke and its preparation method and application

A composite additive, calcium-based technology, used in coke ovens, solid fuels, fuels, etc., can solve the problems of loss of sulfur-fixing ability, sulfur-fixing rate of less than 20%, unsuitable for civil coke, etc. The effect of improving environmental quality and low price

Active Publication Date: 2019-04-05
TAIYUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcium-based sulfur-fixing agent is added to civil coke when coal is blended. When burning in a civil furnace, the sulfur in the fuel eventually forms calcium sulfate and enters the ash to be fixed. However, calcium sulfate begins to decompose when the temperature exceeds 1000 ° C. When the temperature exceeds 1200 ° C, basically Lose the ability to fix sulfur, the rate of sulfur fixation is less than 20%
However, the coal-fired sulfur fixation agent of the prior art is not suitable for the sulfur fixation of civil coke through high temperature dry distillation.
After searching, there is no report on additives to improve the high-temperature sulfur fixation effect of civil coke

Method used

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  • Calcium-based potassium-magnesium-silicon composite additive for improving the high-temperature sulfur fixation effect of civil coke and its preparation method and application
  • Calcium-based potassium-magnesium-silicon composite additive for improving the high-temperature sulfur fixation effect of civil coke and its preparation method and application
  • Calcium-based potassium-magnesium-silicon composite additive for improving the high-temperature sulfur fixation effect of civil coke and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Coarsely crush and finely crush the dried limestone, potassium feldspar, silicon dioxide and magnesium carbonate additive raw materials to a particle size of ≤3mm;

[0026] (2) Weigh 80kg of crushed limestone, 10kg of potassium feldspar, 10kg of silicon dioxide, and 5kg of magnesium carbonate in turn, and mix them together and stir evenly;

[0027] (3) The uniformly stirred mixture is dry-ground to make the particle size of the raw material ≤ 150 mesh (0.1mm); then calcined at 260°C for 2 hours, and cooled to room temperature, which is the calcium-based potassium-magnesium-silicon composite additive;

[0028] (4) Furnace coal is mixed with 20wt% long-flame coal, 15wt% lean coal, 30wt% 1 / 3 coking coal, 20wt% fat coal and 15wt% main coking coal; the quality index of the blended coal For: V adf 30.0%, A d 13.5%, FC d 60.6%, S t,d 0.67%; cohesion index G=74, fineness (≤3mm)=73.6%;

[0029] ⑸According to the calcium-based potassium-magnesium-silicon composite addit...

Embodiment 2

[0042] (1) Coarsely crush and finely crush the dried limestone, potassium feldspar, silicon dioxide and magnesium carbonate additive raw materials to a particle size of ≤3mm;

[0043] (2) Weigh 75kg of crushed limestone, 12.5kg of potassium feldspar, 12.5kg of silicon dioxide, and 6.3kg of magnesium carbonate in turn, and mix them together and stir evenly;

[0044] (3) The uniformly stirred mixture is dry-ground to make the particle size of the raw material ≤ 150 mesh (0.1mm); then calcined at 270°C for 1.8 hours, cooled to room temperature and packaged, which is the calcium-based potassium-magnesium-silicon composite additive;

[0045] (4) Furnace coal is blended with 30wt% weak caking coal, 40wt% long-flame coal, 20wt% gas fertilizer coal and 10wt% non-caking coal; its quality index (wt%): V adf 35.0%, A d 13.5%, FC d 56.2%, S t,d 0.67%, cohesion index G=40, fineness (≤3mm)=86.5%;

[0046] ⑸According to the calcium-based potassium-magnesium-silicon composite additive: t...

Embodiment 3

[0052] (1) Coarsely crush and finely crush the dried limestone, potassium feldspar, silicon dioxide and magnesium carbonate additive raw materials to a particle size of ≤3mm;

[0053] (2) Weigh 70kg of crushed limestone, 15kg of potassium feldspar, 15kg of silicon dioxide, and 7.5kg of magnesium carbonate in turn, and mix them together and stir evenly;

[0054] (3) The uniformly stirred mixture is dry-ground to make the particle size of the raw material ≤ 150 mesh (0.1mm); then calcined at 280°C for 1.5 hours, cooled to room temperature and packaged, which is the calcium-based potassium-magnesium-silicon composite additive;

[0055] (4) Furnace coal is mixed with 20wt% long-flame coal, 15wt% lean coal, 30wt% 1 / 3 coking coal, 20wt% fat coal and 15wt% main coking coal; the quality index of the blended coal For: V adf 30.0%, A d 13.5%, FC d 60.6%, S t,d 0.67%; cohesion index G=74, fineness (≤3mm)=73.6%;

[0056] ⑸According to the calcium-based potassium-magnesium-silicon com...

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Abstract

The invention discloses a calcium-based potassium-magnesium-silicon composite additive for improving the high temperature sulfur fixation effect of civil-use coke. The additive comprises, by weight, 60-80 parts of limestone, 10-20 parts of potassium feldspar, 10-20 parts of silicon dioxide and 5-10 parts of magnesium carbonate. The calcium-based potassium-magnesium-silicon composite additive is wide and abundant in raw material source and low in cost and directly added to destructive distillation matching coal, the civil-use coke containing the calcium-based potassium-magnesium-silicon composite additive is produced through high temperature retorting, the high temperature sulfur fixation rate (1250 DEG C) of the civil-use coke can be raised from 10-15% to 50-75%, the sulfur fixation rate is raised by 40-60%, the effect is remarkable, compared with direct combustion of coal, sulfur dioxide pollutant emission can be lowered by 80% or above, and great practical significance is achieved for meeting the requirement of living coal consumption peri-urban villages, improving environment quality of villages and cities and reducing haze weather.

Description

technical field [0001] The invention relates to a calcium-based potassium-magnesium-silicon composite additive for improving the high-temperature sulfur fixation effect of civil coke, a preparation method and an application. Background technique [0002] Based on the special primary energy endowment of "rich in coal, less in oil, and less in natural gas", coal will still be the most important basic energy in my country for a long time, and nearly half of the coal will be directly used in the form of combustion. Among them, the environmental pollution caused by the use of coal for civilian use cannot be ignored. According to preliminary calculations, burning 1 ton of highly volatile raw coal in northern rural areas will emit more than 2.5 tons of carbon dioxide (carbon emission coefficient 0.67) and more than 150 kilograms of other pollutants (carbon oxidation rate 0.85). In 2014, the amount of coal used for civil scattered combustion was 160 million tons, accounting for onl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B57/06C10L9/10
CPCC10B57/06C10L9/10
Inventor 刘守军杜文广张智聪杨颂上官炬
Owner TAIYUAN UNIV OF TECH
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