The Application And Research Of DCS Control System In Power Plant Chemical Water Treatment

In recent years,the demand of electricity is gradually enhances unceasingly as the rapid growth of the national economy, the suppy of power coal begins to be dificit and then cause the price of power coal to increase. And each power generation company has started to blend the designed coal with other coals in order to reduce consum and increase the competitiveness . Therefore, the study for mixing bituminous boiler with lignite is important for practical significance.This paper assesses the 350MW unit boiler of Fuxin Power Generation as the research object, and researches the ignition characteristics of bituminous boiler lignite, the characteristics of burning , the technology of stable combusion, the measures of blending coals and so on. Because of the lignite containing more volatile and moisture than the designed coal t, coal handing system, pulverizing system and pulverized coal feeding system is easy to explode, mixing coals will lead to lacking dry in coal mill and drastically redusing the efficiency of boiler. Therefore, due to amplifing the maximum limit of the mixing lignite proportion and reducing cost, and meeting to be combustion design coal at the same time, the scheme is put forward in this paper to take somke from the export of the dust collector into the export of primary air fan and send the blending smoke into the coal mill,it will improve the dry of the coal mill,reduce the oxygen consumption in the export of the coal mill,and improve to prevent explosion from the pulverizing system.We did the experiment for the reformed boiler with mixing bituminous with lignite to assess the result of the reformed boiler,the results showed that the pulverizing system could meet dry and safety explosion-proof requirements when the boiler mixed 50% lignite, and the maximum contributing of the mills was 72t/h to meet units with the maximum requirements of the boiler.The concentration of the oxynitride emission decreased by 39.1 mg/m3 after runing the cold smoke system,and the efficiency of the boiler reached to 92.25%. Not only it is an important significance to amplify the fuel limit, reduce the tension of the power coal and rapidly promote the long-term development of the power generation enterprises, but also it is valuable experiment for the same type of units.