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Application of pollutant control in coal combustion process based on directional adjustment of fly ash mineral composition

A technology of mineral composition and fly ash is applied in the application field of pollutant control in the coal combustion process to achieve the effects of improving processing capacity, low system resistance and reducing operating load.

Active Publication Date: 2022-07-19
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 pollutant control in coal combustion process based on directional adjustment of fly ash mineral composition
  • Application of pollutant control in coal combustion process based on directional adjustment of fly ash mineral composition
  • Application of pollutant control in coal combustion process based on directional adjustment of fly ash mineral composition

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 burning low-sulfur coal from power plants and name it low-sulfur fly ash DS.

[0042] Gravity separation method was adopted, using gravity solution (2.89g / cm 3 ) Both low-sulfur fly ash DS and high-sulfur fly ash GS were separated into two parts: the low-sulfur fly ash DS and high-sulfur fly ash GS were dried in an oven at 45 °C for 24 h, and then mixed with bromoform (CHBr 3 , the density is 2.89g / cm 3 ) in a centrifuge tube for 10min, the rotating speed is 3000r / min, the components with higher density sink, and the low-sulfur fly ash DS and high-sulfur fly ash GS are separated into two parts. In this study, A1, A2, and A3 are the raw fly ash, gravity-separated light fly ash, and heavy fly ash, respectively, extracted from high-sulfur coal after cal...

Embodiment 2

[0062] It is well known that acid gases in flue gas, especially SO 2 , which may compete with arsenic to occupy the active sites on the adsorbent surface. Therefore, this example studies SO 2 Effects on the capture of arsenic by these 6 adsorbents.

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

[0064] Adsorption capacity detection of adsorbents:

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

Embodiment 3

[0075] The raw fly ash A1, the light fly ash A2 and the heavy fly ash A3 after gravity separation, and the low-sulfur coal extracted after being calcined at 815° C. were used in Example 1. The original fly ash A4 and gravity-separated light fly ash A5 and heavy fly ash A6 are used as adsorbents to remove the polluting SO in the flue gas at the same time. 2 / NO X / toluene / chlorobenzene / As 2 O 3 , put A1, A2, A3, A4, A5, A6 in the fixed bed to test the adsorption performance of the adsorbent for 4 pollutants. At room temperature, the adsorbent is 10g, the simulated flue gas flow is 200ml / min, and the The concentration at the entrance is 1500, 500, 400, 400, 60 mg / Nm 3 the SO 2 / NO X / toluene / chlorobenzene / As 2 O 3 , also press NOx and NH 3 The concentration ratio of 1:1 mixed with NH 3 , the adsorption process is over, the adsorbent is weighed and SO 2 , NO X , Toluene, Chlorobenzene, As 2 O 3 After the weight change, the adsorption capacity of various adsorbents wa...

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Abstract

The invention discloses an application of pollutant control in a coal burning process based on the directional allocation of fly ash mineral components. The fly ash gravity separation technology is adopted, and the high-sulfur fly ash is separated by bromoform. The content of calcium and iron in the heavy fly ash is much higher than that in the original fly ash. At 700 °C, heavy fly ash has an effect on arsenic, SO 2 , NO x The removal efficiencies of , toluene and chlorobenzene are 63.79%, 71.20%, 67.8%, 72.8% and 65.3%, respectively, which are much higher than the removal efficiency of arsenic and SO from the original fly ash. 2 , NO x The efficiency of pollutants such as toluene and chlorobenzene; the calcium and iron enriched in heavy fly ash have good adsorption and catalytic effects on pollutants, and heavy fly ash can synergistically remove soot through adsorption and catalysis. Arsenic, SO in the air 2 , NO x , toluene and chlorobenzene and other pollutants; in addition, in the presence of SO 2 The adsorption capacity of heavy fly ash to arsenic in the flue gas was increased from 461 μg / g of the original fly ash to 785 μg / g. This technology not only realizes the recycling and resource utilization of fly ash, and achieves the purpose of "pollution control with waste", but also solves the problem of coordinated control of multiple pollutants in coal-fired flue gas.

Description

technical field [0001] The invention belongs to the technical field of flue gas pollution removal, and in particular relates to an application of pollutant control in a coal combustion process based on the directional allocation of fly ash mineral components. Background technique [0002] The coal burning process 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 limit of particulate matter emission concentration is 10 mg / Nm 3 , sulfur dioxide (SO 2 ) The emission concentration limit is 35mg / Nm 3 , the nitrogen oxide (NOx) emission concentration limit is 50mg / Nm 3 . Fine particulate matter is rich in a variety of toxic measurable elements that enter the respiratory system and cause great harm to the human body. For e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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