Low-load denitration system of circulating fluidized bed boiler

Abstract

The invention discloses a low-load denitration system of a circulating fluidized bed boiler, and the system comprises a urea spray gun, a urea solution component, a compressed air component and a flushing water component which are additionally arranged at each secondary air port of a boiler hearth, wherein the urea solution component comprises a urea solution main pipe connected with the urea spray gun; the urea solution main pipe is provided with a stokehole denitration system main pipe manual door and a urea solution to spray gun manual door, the compressed air assembly comprises a compressed air main pipe connected with a urea spray gun, the compressed air main pipe is provided with a compressed air to spray gun manual door, and the flushing water assembly comprises a flushing water pipeline. By arranging the urea spray gun, the urea solution assembly, the compressed air assembly and the flushing water assembly, the problem that nitrogen oxide emission of the low-load circulating fluidized bed boiler exceeds the standard can be solved, the denitration efficiency is improved, the nitrogen oxide emission of the circulating fluidized bed boiler is reduced, and it is guaranteed thatenvironmental protection accidents do not happen to a power plant.

Description

technical field [0001] The invention relates to the field of flue gas denitrification of circulating fluidized bed boilers, in particular to a low-load denitrification system of circulating fluidized bed boilers. Background technique [0002] In petrochemical and electric power production, the requirements for deep peak regulation are put forward, and the units are required to have the ability to operate stably at a low load of 30%. The low-load environmental protection emissions of coal-fired units must be guaranteed to meet the standards. The urea inlet of the SNCR denitrification technology is selected in the furnace. For the horizontal flue at the outlet, the flue temperature is lower than 800°C at low load, which deviates from the optimal reaction temperature of 850-920°C, resulting in a decrease in denitrification efficiency. my country's circulating fluidized bed units generally have a decline in denitrification efficiency at low load sections. A series of problems such...

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Problems solved by technology

[0002] In petrochemical and electric power production, the requirements for deep peak regulation are put forward, and the units are required to have the ability to operate stably at a low load of 30%. The low-load environmental protection emissions of coal-fired units must be guaranteed to meet the standards. The urea inlet of the SNCR denitrification technology is selected in the furnace. For the horizontal flue at the outlet, the flue temperature is lower than 800°C at low load, which deviates from the optimal reaction temperature of 850-920°C, resulting in a decrease in denitrification efficiency. my country's circulating fluidized bed units generally have a decline in denitrification efficiency at low load sections. A series of problems of excessive nitrogen oxide emissions, in order to solve these problems, there is an urgent need for a low-load denitrification process for circulating fluidized bed boilers that can achieve high efficiency, economy and meet the requirements of nitrogen oxide emissions

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