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Preparation method of clay-calcium-based sulfur fixing agent and application of agent in fixing cow dung/high-sulfur composite coal

A calcium-based sulfur-fixing agent and technology of sulfur-fixing agent, applied in the desulfurization field, can solve the problems of low investment, poor thermal stability of sulfur-fixed products, low calcium utilization rate, etc., and achieve high sulfur-fixing rate, good practical economy and application The effect of stability and uniform particle distribution

Inactive Publication Date: 2019-05-24
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Calcium-based sulfur-fixing agents such as limestone and slaked lime are the most researched sulfur-fixing agents due to their low investment and convenient operation. However, adding a single calcium-based compound has problems such as low calcium utilization rate and poor thermal stability of sulfur-fixed products.

Method used

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  • Preparation method of clay-calcium-based sulfur fixing agent and application of agent in fixing cow dung/high-sulfur composite coal
  • Preparation method of clay-calcium-based sulfur fixing agent and application of agent in fixing cow dung/high-sulfur composite coal
  • Preparation method of clay-calcium-based sulfur fixing agent and application of agent in fixing cow dung/high-sulfur composite coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Preparation of clay-calcium-based sulfur fixative

[0026] At room temperature, dissolve 10.5 g of tartaric acid in 200 mL of water in a beaker, then add 10.0 g of calcium oxide, mix well, heat and stir in a constant temperature water bath at 75°C for 4 h (to ensure complete acidification of the quicklime), and obtain the acidified product ;Dry the acidified product in an oven at 105°C, grind it, then put it into an air atmosphere muffle furnace, raise the temperature to 900°C at a heating rate of 5°C / min, and calcinate for 2 hours to obtain acidified calcium oxide;

[0027] Acidified calcium oxide and red clay are mechanically mixed at a mass ratio of 3.5:1, and ground evenly to obtain a clay-calcium-based sulfur-fixing agent.

[0028] 2. Preparation of coal briquettes

[0029] Take 6.0 g of dry cow dung, mix well with 18.0 g of high-sulfur foamed coal (passed through a 18-mesh sieve), then add about 2.6 g of binder and 1.4 g of clay-calcium-based sulfur-fixing age...

Embodiment 2

[0031] 1. Preparation of clay-calcium-based sulfur fixative

[0032] Dissolve 12.8 g of tartaric acid in 200 mL of water, then add 14.0 g of calcium oxide, mix well, heat and stir in a constant temperature water bath at 85°C for 4 h (to ensure complete acidification of quicklime), and obtain an acidified product; Dry in an oven at ℃, grind, and then put it into an air-atmosphere muffle furnace, raise the temperature to 950°C at a heating rate of 6°C / min, and calcinate for 2.5 hours to obtain acidified calcium oxide;

[0033] Acidified calcium oxide and red clay are mechanically mixed at a mass ratio of 4:1, and ground evenly to obtain a clay-calcium-based sulfur-fixing agent.

[0034] 2. Preparation of coal briquettes

[0035] Take 6.0 g of dry cow dung, mix it with 18.0 g of high-sulfur foamed coal (passed through a 18-mesh sieve), then add about 2.6 g of binder and 1.6 g of clay-calcium-based sulfur-fixing agent, and add an appropriate amount of water Stir evenly, extrude ...

Embodiment 3

[0037] 1. Preparation of clay-calcium-based sulfur fixative

[0038] Dissolve 11 g of tartaric acid in 200 mL of water, then add 12.0 g of calcium oxide, mix well, heat and stir in a constant temperature water bath at 80°C for 4 h (to ensure complete acidification of quicklime), and obtain an acidified product; Dry in an oven at ℃, grind, and then put it into an air atmosphere muffle furnace, raise the temperature to 950°C at a heating rate of 4.5°C / min, and calcinate for 2 hours to obtain acidified calcium oxide;

[0039] Acidified calcium oxide and red clay are mechanically mixed at a mass ratio of 4.5:1, and ground evenly to obtain a clay-calcium-based sulfur-fixing agent.

[0040] 2. Preparation of coal briquettes

[0041] Take 6.0 g of dry cow dung and mix it with 18.0 g of high-sulfur foamed coal (passed through a 18-mesh sieve), then add about 2.6 g of binder and 1.7 g of clay-calcium-based sulfur-fixing agent, and add an appropriate amount of water Stir evenly, extru...

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Abstract

The invention provides a preparation method of a clay-calcium-based sulfur fixing agent. The preparation method includes acidizing calcium oxide with tartaric acid, drying, grinding, and calcining ina muffle furnace to obtain acidized calcium oxide; and mechanically mixing the acidified calcium oxide and natural clay and grinding evenly to obtain the clay-calcium-based sulfur fixing agent. The sulfur fixing agent has the advantages of fluffy structure, uniform particle distribution, increased specific surface area, high sulfur fixing rate, good thermal stability of sulfur fixing products andthe like, is used for sulfur fixing of cow dung / high-sulfur composite coal, wherein the sulfur content (St, ad) of the briquette is less than 0.50%, and the sulfur fixing rate reaches about 70.0%, andthus sulfide emission during combustion of the cow dung / high-sulfur composite coal is effectively reduced. In addition, the sulfur fixing agent prepared by the method has the advantages of easily-available raw materials, safe use, simple preparation process and better economy and application.

Description

technical field [0001] The invention relates to the preparation of a clay-calcium-based sulfur-fixing agent, which is mainly used as a sulfur-fixing agent for the preparation of cow dung / high-sulfur coal composite briquettes, and belongs to the technical field of desulfurization. Background technique [0002] Under the current social background in our country, the environmental pollution caused by the traditional combustion of high-sulfur coal and biomass is one of the main problems to be solved in the process of clean and efficient utilization of energy. As one of the most abundant waste materials on earth, cow dung is mostly used as household fuel in most developing countries, especially in pastoral areas. However, this traditional utilization method has difficulties in forming cow dung, serious smoke and dust emissions, and low energy utilization. disadvantages. Mix cow dung with high-sulfur coal, and prepare cow dung briquettes with low pollutant emissions, up-to-standa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/10C10L10/02C10L5/42C10L5/04
CPCY02E50/10Y02E50/30
Inventor 査飞宋艾林
Owner NORTHWEST NORMAL UNIVERSITY
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