Abstract
The article focuses on the methods of reducing nitrogen oxide emissions that are important to consider and apply in operation of ship boilers and thermal power plants, along with other activities aimed to protect the environment. Nitrogen oxide emissions can be restrained by using the technological (primary, in-process) operations. Flue gas recirculation is the most popular method of restraining nitrogen oxide emissions in oil-gas boilers, reducing the temperature and nitrogen oxide concentration in flue gases. Besides affecting the environment, the combustion products recirculation greatly lowers the technical and economic performance of the boiler by decreasing its performance that is why using the method remains limited. There has been described the scheme of flue gas recirculation in the ship auxiliary boilers that ensures reduction of nitrogen oxide emissions and increase in efficiency of boiler furnace. It has been proposed to combine steam and carbon dioxide fuel conversion with power combustion and thermochemical heat regeneration. Thermodynamic feasibility of combustion product recirculation in ship auxiliary boiler has been given. Using the power and stoichiometric analyses of reference liquid fuel combustion, the possibility of fuel conversion has been illustrated for the case when both fuel and recirculation gases are supplied into reburning zone of the furnace. The calculations determine air oxygen ratio for reburning and oxidative zones, flue gas recirculation factor and furnace efficiency change at thermochemical heat regeneration. The study results are proposed to use in non-stoichiometric and staged fuel combustion.
Highlights
В составе мероприятий по охране воздушного бассейна при работе судовых котлов и тепловых электрических станций крайне важно учитывать и применять способы снижения выбросов оксидов азота
The article focuses on the methods of reducing nitrogen oxide emissions that are important to consider and apply in operation of ship boilers and thermal power plants, along with other activities aimed to protect the environment
Nitrogen oxide emissions can be restrained by using the technological operations
Summary
В составе мероприятий по охране воздушного бассейна при работе судовых котлов и тепловых электрических станций крайне важно учитывать и применять способы снижения выбросов оксидов азота. Рассматривается вариант организации схемы РДГ в судовых вспомогательных котлах с целью использования РДГ для снижения выбросов оксидов азота и для повышения КПД топочного устройства. Проиллюстрирована возможность конвертирования топлива при совместном вводе его и газов рециркуляции в восстановительную зону горения топочной камеры на основе энергетического и стехиометрического анализов процессов горения условного жидкого топлива. Рассчитаны соотношение подачи кислорода воздуха в восстановительную и окислительную зоны горения, степень рециркуляции дымовых газов, изменение КПД топки при термохимической регенерации теплоты.
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