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Application of coal burning process pollutant control based on directional blending of coal ash mineral components

A technology of mineral composition and fly ash, which is applied in the application field of pollutant control in the coal combustion process, to achieve the effects of reducing operating load, improving flue gas treatment capacity, and increasing adsorption capacity

Active Publication Date: 2021-07-09
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology not only provides a new type of adsorption / catalysis material for the control of multi-pollutants in coal-fired flue gas, realizes the recycling and utilization of fly ash, achieves the purpose of "using waste to control pollution", but also solves the problem of multi-pollutant pollution in coal-fired flue gas. The problem of coordinated control of pollutants has greatly reduced the operating load of the coal-fired flue gas purification system, improved the flue gas treatment capacity, and achieved the goal of more efficient and economical treatment of coal-fired flue gas

Method used

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  • Application of coal burning process pollutant control based on directional blending of coal ash mineral components
  • Application of coal burning process pollutant control based on directional blending of coal ash mineral components
  • Application of coal burning process pollutant control based on directional blending of coal ash mineral components

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Two types of fly ash were collected from two coal-fired power plants in Hubei Province. One type of fly ash comes from power plants that burn high-sulfur coal and is called high-sulfur fly ash GS. The other is to collect burned low-sulfur coal from power plants and name it low-sulfur fly ash DS.

[0042] Adopt gravity separation method, use gravity solution (2.89g / cm 3 ) to separate the low-sulfur fly ash DS and high-sulfur fly ash GS into two parts: dry the low-sulfur fly ash DS and high-sulfur fly ash GS in an oven at 45 °C for 24 h, and then mix with bromoform (CHBr 3 , with a density of 2.89g / cm 3 ) were mixed in a centrifuge tube for 10 minutes at a speed of 3000 r / min, the denser components sank, and the low-sulfur fly ash DS and high-sulfur fly ash GS were separated into two parts. In this study, A1, A2 and A3 are raw fly ash extracted from high-sulfur coal calcined at 815 °C, light fly ash and heavy fly ash after gravity separation, respectively. A4, A5, and...

Embodiment 2

[0062] It is well known that acid gases in flue gas, especially SO 2 , may compete with arsenic to occupy the active sites on the adsorbent surface. Therefore, this example studies the SO 2 Effects on the capture of arsenic by these six adsorbents.

[0063] The fly ash A1, A2, and A3 obtained by sorting the high-sulfur coal powder in Example 1 after calcination were used as adsorbents. Then add the SO of 500ppm and 1500ppm respectively in the mixed gas that the arsenic generating system of embodiment 1 generates 2 , make the mixed gas flow through 300mg of adsorbent according to the flow rate and temperature set in Example 1, and the adsorption time is 1h. After adsorption, the used adsorbent is cooled and collected for subsequent analysis. Each experiment was repeated three times to ensure reproducibility.

[0064] Adsorption capacity detection of adsorbent:

[0065] Different fly ash adsorbents in different SO at 700℃ 2 The adsorption capacity of arsenic under the conc...

Embodiment 3

[0075] Using the raw fly ash A1 extracted after the high-sulfur coal was calcined at 815°C in Example 1, the light fly ash A2 and heavy fly ash A3 after gravity separation, and the low-sulfur coal extracted after calcining at 815°C The raw fly ash A4 and the light fly ash A5 and heavy fly ash A6 after gravity separation are used as adsorbents to simultaneously remove the polluting SO in the flue gas 2 / NO X / Toluene / Chlorobenzene / As 2 o 3 , put A1, A2, A3, A4, A5, A6 in the fixed bed to detect the adsorption performance of the adsorbent on the four kinds of pollutants. The inlet concentration is 1500, 500, 400, 400, 60mg / Nm respectively 3 SO 2 / NO X / Toluene / Chlorobenzene / As 2 o 3 , also according to NOx and NH 3 The concentration ratio is 1:1 mixed with NH 3 , the adsorption process is over, weigh the adsorbent while feeding SO 2 , NO X , toluene, chlorobenzene, As 2 o 3 The final weight changes were used to obtain the adsorption capacities of various adsorbents....

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Abstract

The invention discloses application of coal burning process pollutant control based on directional blending of coal ash mineral components. A fly ash gravity separation technology is adopted, high-sulfur fly ash is separated by bromine imitation, and the mass contents of calcium and iron in heavy fly ash are far higher than those in original fly ash. At 700 DEG C, the removal efficiencies of the heavy fly ash on arsenic, SO2, NOx, toluene and chlorobenzene are 63.79%, 71.20%, 67.8%, 72.8% and 65.3% respectively, and are far higher than the removal efficiencies of pollutants such as arsenic, SO2, NOx, toluene and chlorobenzene in the original fly ash. Calcium and iron enriched in the heavy fly ash have good adsorption and catalysis effects on pollutants, and the heavy fly ash synergistically removes arsenic, SO2, NOx, toluene, chlorobenzene and other pollutants in the coal-fired flue gas through the dual effects of adsorption and catalysis. In addition, in SO2-containing flue gas, the adsorption capacity of heavy fly ash to arsenic is improved to 785 [mu]g / g from 461 [mu]g / g of original fly ash. According to the technology, recycling utilization of the fly ash is achieved, the purpose of treating pollution with waste is achieved, and the problem of cooperative control over multiple pollutants of the coal-fired flue gas is solved.

Description

technical field [0001] The invention belongs to the technical field of flue gas pollution removal, and in particular relates to an application of coal-burning process pollutant control based on directional deployment of fly ash mineral components. Background technique [0002] Coal combustion produces a large amount of pollutants such as sulfur dioxide (SO 2 ), nitrogen oxides (NOx), fine particulate matter, heavy metals, etc., which can cause serious environmental problems. At present, my country has fully implemented the ultra-low emission of flue gas from coal-fired power plants, that is, the emission concentration limit of particulate matter is 10mg / Nm 3 , sulfur dioxide (SO 2 ) emission concentration limit is 35mg / Nm 3 , the emission concentration limit of nitrogen oxides (NOx) is 50mg / Nm 3 . Fine particulate matter is rich in a variety of toxic elements that enter the respiratory system and cause great harm to the human body. For example, arsenic is a highly toxic...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/90B01D53/06B01D53/60B01D53/64B01D53/70B01D53/72
CPCB01D53/86B01D53/8637B01D53/8665B01D53/8662B01D53/8668B01D53/90B01D53/06B01D2258/0283B01D2257/2064Y02A50/20
Inventor 韩军秦林波赵波梁洋硕陈耕
Owner WUHAN UNIV OF SCI & TECH
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