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Optimizing post-combustion nitrogen oxide and sulfur dioxide reductions and improving combustion efficiency in coal fired boilers
Optimizing post-combustion nitrogen oxide and sulfur dioxide reductions and improving combustion efficiency in coal fired boilers
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机译：优化燃烧后氮氧化物和二氧化硫的减少量，提高燃煤锅炉的燃烧效率
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摘要
A method for increasing the nitrogen oxide emissions by either removing or modifying fuel rich nitrogen oxide (NOx) reduction processes thereby improving combustion efficiencies especially with low volatile low sulfur coals, and remove unburned carbon, reduce sulfur dioxide and reducing carbon dioxide emissions, while using post-primary combustion urea or ammonia injection with or without a reburn fuel NOx reducing process to restore NOx to regulated emission levels. Furthermore, adding lime or limestone to the urea or ammonia solution to further reduce SO2 and to increase the concentration of the carbon free fly ash to cementitious concentrations. Furthermore, by proper number and disposition of the injectors in the post combustion zone and by further water diluting the mixture, this NOx reduction process is effective at substantially higher gas temperatures than conventional Selective Non-Catalytic NOx Reduction and with no ammonia slip. This method significantly increases the profitability of power plants.
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机译：一种通过去除或修改富燃料的氮氧化物（NO x ）还原工艺来增加氮氧化物排放量的方法，从而提高燃烧效率，尤其是对于挥发性低的低硫煤，并去除未燃烧的碳，减少二氧化硫并减少初次燃烧时的尿素或氨注入，并使用或不使用再燃燃料NO x 还原过程，以将NO x 恢复到规定的排放水平。此外，向尿素或氨溶液中添加石灰或石灰石可进一步还原SO 2 ，并将无碳粉煤灰的浓度提高至胶结浓度。此外，通过在后燃烧区适当设置喷射器并进一步稀释水，这种NO x 还原过程在比常规选择性非催化NO < Sub> x 还原，无氨漏失。这种方法大大提高了发电厂的盈利能力。
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