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Plasma flying ash melting tail gas wet-purification process

A plasma and wet purification technology, applied in the direction of separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of poor quality and high content of heavy metals, and achieve large mass transfer driving force, high separation efficiency, and high transmission efficiency. Effect of Heat and Mass Transfer Efficiency

Inactive Publication Date: 2017-08-04
JIANGSU TIANYING ENVIRONMENTAL PROTECTION ENERGY COMPLETE EQUIP CO LTD
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Problems solved by technology

[0005] The gypsum produced by the semi-dry method has poor quality and high heavy metal content due to its high content of calcium chloride and heavy metals, and will still be treated as hazardous waste

Method used

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  • Plasma flying ash melting tail gas wet-purification process

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Embodiment 1

[0029] like figure 1 Shown is the flow chart of the wet purification process of the plasma fly ash fusion tail gas of the present invention.

[0030] The waste incineration fly ash is processed by the plasma melting furnace, and the exhaust gas enters the dynamic wave device through the high-temperature pipeline to reduce the temperature below 100°C, and then enters the water washing tower, in which the HCl gas is completely removed; the tail gas from which the HCl is removed enters the alkali Washing tower, remove SO in alkali washing tower 2 Wastewater after gas, water washing and alkali washing are neutralized, precipitated and separated through their respective sewage treatment devices to remove heavy metals and suspended solids in the sewage, and the final concentrated brine is respectively passed through an evaporation crystallizer to obtain chloride salts and sulfates. It is used as a dyeing aid in the printing and dyeing industry; the final clean tail gas is drawn by ...

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Abstract

The invention relates to a plasma flying ash melting tail gas wet-purification process. The process includes: after plasma flying ash melting tail gas is cooled to 100 DEG C or below by a quenching device, sequentially feeding into a water washing tower and an alkaline washing tower to realize deacidification, discharging smoke to the atmosphere from the alkaline washing tower, respectively purifying waste liquid discharged from the water washing tower and the alkaline washing tower, and recycling obtained metal chlorine salts and metal sulfuric acid salts. The purification process has advantages of completeness and effectiveness in removal of acid gases and the metal chlorine salts, heavy metal salt enrichment is avoided, HCl and SO2 in the tail gas are separated from the source of the tail gas purification process, and the two metal salts are recycled through a water treatment device, so that pollutants in the tail gas are effectively recycled.

Description

technical field [0001] The invention relates to a wet purification process of plasma fly ash fusion tail gas. Background technique [0002] The fly ash produced in the waste incineration process contains heavy metals and other substances with high leaching concentration. The state stipulates that the heavy metals must be solidified after special treatment before being landfilled or resource reused. [0003] Foreign fly ash melting tail gas purification systems mostly use the "water spray cooling + dry deacidification" process, and the purified tail gas is imported into the tail gas purification system of the waste incineration line for further purification and then discharged. However, the dry deacidification of the above-mentioned tail gas purification system will still produce a large amount of secondary fly ash, so there is still the problem of secondary pollution. [0004] Due to the high concentration of acid gas produced during the melting process of fly ash, a large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/78B01D53/68B01D53/50B01D53/73
Inventor 杨燕玲田君国李要建李军陈竹严圣军
Owner JIANGSU TIANYING ENVIRONMENTAL PROTECTION ENERGY COMPLETE EQUIP CO LTD
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