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Compound Additives

A technology of compound additives and additives, which is applied in the fields of chemical industry, energy and environmental protection, can solve the problems of environmental pollution, achieve the effects of reducing emissions, increasing the effective area, and suppressing the production of NOx

Active Publication Date: 2019-02-26
YANKUANG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, in the prior art, the direct combustion of coal will produce SO 2 , NOx and other toxic and harmful gases, polluting the environment

Method used

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Examples

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Effect test

Embodiment 1

[0063] The embodiment of the present invention provides a composite additive, including calcium-based additives and sodium-based additives, the calcium-based additives include but not limited to inorganic calcium compounds, such as limestone powder (CaCO 3 ), slaked lime powder (Ca(OH) 2 ), lime (CaO) and dolomite (CaCO 3 MgCO 3 ), etc., and organic calcium compounds, such as calcium propionate, calcium magnesium acetate, etc.; the sodium-based additives include but are not limited to baking soda powder (NaHCO 3 ), soda ash (Na 2 CO 3 ) or caustic soda (NaOH). In this embodiment and subsequent embodiments, the calcium-based additive and the sodium-based additive may also include all wastes containing calcium or sodium, such as egg shells, shells, carbide slag or spent caustic soda.

[0064] In the composite additive comprising calcium-based additives and sodium-based additives provided in the embodiments of the present invention, after the calcium-based additives and sodi...

Embodiment 2

[0081] The composite additive provided in the embodiment of the present invention is based on the composite additive provided in Example 1 and then mixed with an amino additive, the amino additive includes but not limited to urea, ammonia water, ammonia sulfide, etc. After adding the amino additive in the composite additive , can remove the nitrate produced in the combustion process of coal powder.

[0082] In an embodiment of the present invention, the amount of amino additive added in the composite additive is based on the NOx pollutant generation and removal requirements of the coal to be mixed with the composite additive in the combustion process and the temperature and atmosphere (oxidizing atmosphere or reducing atmosphere) of the composite additive. Atmosphere) and selected and determined, in a preferred scheme, the molar ratio of the amino additive to the amount of NOx generated is in the range of 1 to 3, in a more preferred scheme, the molar ratio of the amino additive...

Embodiment 3

[0086] The composite additives provided in the embodiments of the present invention are based on the composite additives provided in Embodiment 1 or Embodiment 2 and then mixed with halogen additives. The halogen additives include calcium bromide, sodium bromide, calcium chloride, chloride Sodium etc. Halogen additives can remove heavy metal elements, such as mercury, that appear in pulverized coal during combustion. Mercury can exist in the air in the form of 0 valence, but 0 valence mercury is insoluble in water, only the divalent mercury oxide can dissolve in water or be condensed and adsorbed by fly ash to be removed. Halogen is a strong oxidizing agent, which can oxidize the zero-valent mercury produced by the combustion of coal powder into divalent mercury oxide, which can be dissolved in water or attached to coal ash to be removed.

[0087] In the embodiment of the present invention, the addition amount of the above-mentioned halogen additive is selected and determined...

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Abstract

Embodiments of the invention provide a composite additive, which comprises a calcium-based additive and a sodium-based additive, wherein the calcium-based additive comprises an inorganic calcium compound, an organic calcium compound or a combination of an inorganic calcium compound and an organic calcium compound, and the sodium-based additive comprises at least one selected from baking soda powder (NaHCO3), at least soda ash (Na2CO3) and caustic soda (NaOH). According to the present invention, the composite additive provided by the embodiments and coal are doped, and the obtained mixture is burned, such that SO2, HCL, HF, NOx and other toxic and harmful gases produced during the coal burning can be reduced, and the environmental pollution can be reduced.

Description

technical field [0001] The invention relates to the fields of chemical industry, energy and environmental protection, in particular to a composite additive. Background technique [0002] China is a country that uses coal as the main energy source in the world. Since 1980, the proportion of coal in China's primary energy composition has been above 70%. In 2013, the national coal output was about 3.7 billion tons, most of which (about 80%) were used for direct combustion in boilers. As the economy continues to develop, the national demand for coal will continue to grow. According to China's resource composition and economic foundation, it can be predicted that in the next 50 years, China's primary energy consumption is dominated by coal, which is difficult to change. [0003] According to statistics, more than 90% of SO in the atmosphere of China 2 Emissions, more than 67% of NOx (nitrogen oxides) emissions, more than 71% of CO emissions, more than 70% of soot emissions, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L10/02C10L10/06C10L9/10C10L9/12
Inventor 魏联民孟祥军王振平
Owner YANKUANG GRP CO LTD
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