Patent ID: 7544338
Filing Date: 2009-06-09
Classification: B01D,Y02A,Y10S

Abstract:
1. A process for removing mercury from a mercury-containing exhaust gas containing nitrogen oxides, sulfur oxides and mercury, which comprises: feeding a mercury chlorinating agent to a flue exhaust gas containing nitrogen oxide, sulfur oxide and mercury; carrying out reductive denitration in the presence of a solid catalyst; and desulfurizing in wet process with an alkaline absorbing solution, wherein the step of feeding a mercury chlorinating agent further comprises a step of: gasifying a non-gaseous agent for mercury chlorination which is in the non-gaseous form at normal temperature and normal pressure prior to the feed into the flue; measuring the concentration of the gaseous agent for mercury chlorination upstream of a desulfurization unit in the flue; calculating an initial concentration of the gaseous agent for mercury chlorination to be fed by a mercury chlorinating agent feed unit based on the measured concentration of the gaseous agent for mercury chlorination; and controlling an amount of the non-gaseous agent for mercury chlorination to be fed into the flue based on the calculated initial concentration.