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System and method for removing SO3 by cyclically compounding fly ash and magnesium-based desulfurizer

A technology of fly ash and desulfurizer, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problem of no alkaline component reuse, reduce the risk of unexpected shutdown, and remove ABS adhesion and corrosion Problems, the effect of reducing running resistance

Pending Publication Date: 2022-02-18
BEIJING SPC ENVIRONMENT PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The basic principles of the above methods all use fresh absorbent excess spray gun, no absorbent and effective alkaline components in the flue gas are reused

Method used

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  • System and method for removing SO3 by cyclically compounding fly ash and magnesium-based desulfurizer

Examples

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Embodiment

[0071] Take a 600MW unit as an example, the total smoke gas volume of 2 parallel SCR reactor 6 is 2 × 11.35 million nm. 3 / hr, dust concentration in flue gas 35g / nm 3 SO 3 200mg / m 3 408kg / hr SO 3 , Reaching 90% removal efficiency. Single-side SCR reactor tail flue 6-1 size is 4200x9206, configuring a total of 18 nozzle long spray guns 15-1, the injection coverage is 120%, the configuration single fluid multi-nozzle long spray gun 15-2 a total of 17 bits, injection The coverage is 110%, and the bilateral flue is shared by 36 bons and 34, and Mg / SO is set. 3 Molar ratio reached 1.6, co-spray magnesium base SO 3 Removal agent 5.9T / hr; set a gray sulfide ratio 220, circulating use of fly ash again 10.4T / HR, dust collector secondary gray struggle 9-2, dust collector three-stage land 9-3 and dust collector level 4 Fly ash for circulating and ejecting in the Dray 5-4 accounted for 51.9%, 28.8%, and 19.2% of the gray amount of the gray bucket, respectively.

[0072] The prese...

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Abstract

The invention relates to the field of purification of flue gas from coal-fired boilers, in particular to a system and a method for removing SO3 by cyclically compounding fly ash and a magnesium-based desulfurizer. The system for removing SO3 by cyclically compounding the fly ash and the magnesium-based desulfurizer comprises a boiler, an SCR reactor, an air preheater, a fly ash circulating conveying device, a dust remover and a magnesium-based desulfurizing agent supply device, wherein the boiler, the SCR reactor, the air preheater and the dust remover are connected in sequence; an SCR tail flue is arranged between the SCR reactor and the air preheater; the magnesium-based desulfurizing agent supply device is used for spraying magnesium-based desulfurizing agent slurry into the SCR tail flue; and the fly ash circulating conveying device is used for conveying the fly ash in the dust remover to the SCR tail flue. Therefore, the alkaline effective components of CaO and MgO in the fly ash can be utilized to remove SO3 in the flue gas.

Description

Technical field [0001] The present invention relates to the field of flue gas purification of coal-fired boiler, and more particularly to a system and method of a fly ash cycle composite magnesium-based dethyl removal SO3. Background technique [0002] SOs produced in the combustion process in coal 2 0.5% ~ 2% further oxidation into so 3 The vanadium-based catalyst will be 0.3% to 2% SO 2 Oxidation, resulting in SO 3 The concentration is adjusted nearly double than the SCR is not installed. SO 3 Genes ammonium hydrogen sulfate with escape, block corrosion air preheater, endanger downstream equipment, affecting production. SO 3 The aerosol is formed, which is harm to the environment and animals and plants. [0003] The sulfur dioxide gas and water vapor can bind to steam sulfate, and its condensation dew point temperature is higher than 120 ° C, the higher the dew point temperature, the more the flue gas contains, the greater the corrosion is blocked. Traditional air preheater can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/86B01D53/56B01D53/77
CPCB01D53/502B01D53/8625B01D2251/402B01D2251/404B01D2251/602B01D2258/0283
Inventor 周欣采有林曹春苗刘丹丹
Owner BEIJING SPC ENVIRONMENT PROTECTION TECH
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