Exhaust gas treatment system and exhaust gas treatment method

Abstract

The purpose of the present invention, on the premise of being an exhaust gas treatment system for using an exhaust gas treatment agent to treat an exhaust gas produced in the incineration of waste and then using a fly ash treatment agent to treat recovered fly ash, is to: eliminate the complexity of managing the stock quantity and controlling the addition amount of the fly ash treatment agent, thus saving labor; and avert a stock exhaustion (shortage) of the fly ash treatment agent. This exhaust gas treatment system is provided with: an exhaust gas treatment unit; a fly ash recovery unit; an exhaust gas treatment agent addition management unit provided to at least the upstream side from among the upstream side and the downstream side of the exhaust gas treatment unit, the exhaust gas treatment agent addition management unit analyzing the amount of acid contained in the exhaust gas, calculating the addition amount of the exhaust gas treatment agent at which the amount of alkali contained in the fly ash becomes within a prescribed range, and issuing a command to supply the exhaust gas treatment agent in the calculated addition amount; an exhaust gas treatment agent supply unit for supplying, to the exhaust gas treatment unit, the exhaust gas treatment agent in the addition amount according to the command issued by the exhaust gas treatment agent addition management unit; a fly ash treatment unit; and a fly ash treatment agent supply unit for supplying, to the fly ash treatment unit, the fly ash treatment agent at a given mass ratio relative to the fly ash loaded into the fly ash treatment unit.

Description

technical field [0001] The present invention relates to an exhaust gas treatment system and an exhaust gas treatment method. More specifically, it relates to a method capable of setting a fixed amount of a fly ash treatment agent required for treating fly ash recovered from exhaust gas and eliminating the need for stockpiling. Managers regularly check exhaust gas treatment systems and exhaust gas treatment methods that are complicated in management such as inventory. Background technique [0002] Exhaust gas from incineration of waste is an acidic gas containing hydrogen chloride and sulfur oxides. Conventionally, after treating such exhaust gas with an exhaust gas treatment agent such as slaked lime and sodium bicarbonate, the fly ash, which is a solid matter, is dedusted using a dust collector such as a bag filter, and then discharged from a chimney. [0003] On the other hand, fly ash recovered from dust collectors may contain heavy metals such as lead, cadmium, arsenic,...

AI Technical Summary

Problems solved by technology

[0005] Sometimes, a fixed amount of such fly ash treatment agent is added for each batch of fly ash treatment or for each specific amount of fly ash, but in this case, the optimal amount of fly ash treatment agent for treatment of fly ash The ash properties of fly ash fluctuate. Therefore, in the case of adding a fixed amount of fly ash treatment agent, even if a specific amount of fly ash is treated, the fly ash treatment agent is effective for the harmless treatment of fly ash. There may also be insufficient or excessive

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