Coke dry quenching method and system

Abstract

A coke dry quenching method for recovering heat in the form of steam in a waste heat boiler using a quenching column comprising a cooling chamber and a prechamber located above by loading red heat coke from above the prechamber, blowing air and / or water or steam into the prechamber, and exchanging sensible heat of the red heat coke in the cooling chamber using an inert gas as a medium. The quantity of steam being recovered is kept at a constant level by regulating the quantity of air and / or water or steam being blown into the prechamber such that the quantity of heat entering the waste heat boiler has a target level, the quantity of combustible gas component and oxygen component in the circulation gas is kept at a minimum level, adhesion of foreign matters to the sloping flue section is prevented, a heat recovery efficiency is prevented from lowering while protecting the boiler tubes against thermal damage, and the quantity of sensible heat being recovered is maximized while preventing increase of circulation gas ventilation resistance and protecting the boiler tubes against damage due to wear.

Description

technical field [0001] The invention relates to a coke dry quenching method and a flame extinguishing device. Background technique [0002] When cooling the red-hot coke discharged from the coke oven, a coke dry quenching device (so-called CDQ (Coke Dry Quencher)) is used in order to recover the sensible heat of the red-hot coke and save energy. [0003] The dry coke quenching device has a cooling chamber for exchanging sensible heat of red-hot coke with inert gas, and a pre-chamber above the cooling chamber. Red-hot coke is loaded into the pre-chamber from the top of the pre-chamber. The setting of the pre-chamber is for the purpose of absorbing the time fluctuation of red hot coke input and obtaining the stability of operation. [0004] After coke is cooled to around 200°C by heat exchange with inert gas in the cooling chamber, a certain amount is discharged each time. After heat exchange, the inert gas heated to 900°C is discharged from the upper part of the cooling ch...

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Problems solved by technology

[0022] The high-temperature exhaust gas discharged from the coke quenching tower is supplied to the waste heat boiler through the inclined flue part, but if the amount of the exhaust gas exceeds the upper limit flow rate, the phenomenon of coke floating and scattering from the inclined flue part will occur. The sharp increase in the ventilation resistance of the circulating gas is related to the failure of the boiler tube wear caused by the flying coke, so it must be controlled at a certain flow rate or below

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