The Research On Technology Of Dedusting And Desulfurization Of The Flue Gas From Coal-Fired Boiler And Application Of Fly Ash

Considering the current situation in China, the suitable technology is still the integrated dedusting and desulfurization technology. This paper analyzes on this technology theoretically, such as the application of wet collision theory in wet dedusting technology; to educe the estimation model for dedusting efficiency by applying cyclone separation theory; to estimate the dedusting efficiency by estimation model for dedusting efficiency with different structure size for the distribution of the quality granularity frequency of the gas and inlet dust powder, so as to instruct the research and design for the de-duster; to set up the model of relationship between the absorbent pH value and absorbent desulfurization amount for the usual wet lime desulfurization technology; based on the above model to estimate the desulfurization amount and efficiency in the design of desulfurization process with supply amount of absorbent and pH value at the starting and finishing point or to estimate the needed absorbent supply and the lime consumption for the required de-sulfur efficiency.Based on the theoretical analysis, experiment research with 3 sets of self-made simulating equipment has been done in the lab, including the dedusting performance, equipment resistance, dehydration performance. The dedusting effect in the lab condition can reach >98%. The comparison analysis on the performance of 3 sets of equipment has also been done. The selected dedusting and desulfurization equipmenthas integrated the wet collision ,cyclone separation and modified Venturi mechanism,with compact structure and high purification effect. The circumstance for dedusting and desulfurization of coal-fired flue gas is very complicated, so the research on the performance of corrosive-resistant and anti-abrasion of material has been done. According to the characteristic of the corrosion and abrasion where material located, different kinds of material or compounding materials have been used to prevent the corrosion and abrasion.Based on the theory study and the small pilot lab of simulating equipment, the equipment compatible with dedusting and desulfurization for middle and small-scaled coal-burning boiler is researched and developed, and perfected the application in industries. In the industrial application the amounts of the added alkali materials for desulfurization will be less if making full use of the alkali materials produced by coal-burning boiler itself to remove the SOa in the flue gas. Afterwards the research on the application for the flue gas treatment o f 1 30T/H coal-burning boiler has been done. A11 the tests indicate that the dedusting and desulfurization effect has been better than the national first-class emission standards. This paper researches on activated treatment of fly ash from coal-burning boiler in power station for t he b lend m aterial o f c ement b y i ntegrating mechanic activation a nd c hemical activation method. When the added activated fly ash has arrives at 30%, the intensity indicator of No. 425 cement can be achieved.