Flue gas SCR denitration efficiency-improving system and method

Abstract

The invention provides a flue gas SCR denitration efficiency-improving system and method. The method includes: spraying an oxidant into a flue between a boiler hearth outlet and a SCR denitration catalyst to partly oxidize NO in flue gas into NO2; enabling NO2 to enter a SCR denitration system to contact with a denitration catalyst to be in quick SCR denitration reaction at the present of NH3. SCRdenitration reaction velocity is accelerated, and denitration efficiency of an original SCR denitration system is improved. The system comprises an oxidant injection system and a SCR catalytic reducing denitration system, the oxidant injection system comprises an oxidant tank, an oxidant pump, a metering module, a dilution system, a distribution module and a nozzle system, and the SCR catalytic reducing denitration system comprises a SCR denitration reaction tower connected on a boiler flue gas outlet and a catalyst arranged in the SCR denitration reaction tower. The method and the system canimprove denitration efficiency of existing flue gas SCR denitration systems and are suitable for flue gas SCR denitration systems of many industries.

Description

technical field [0001] The invention relates to a system and method for selective catalytic reduction SCR denitrification of flue gas from fossil fuel combustion, in particular to a system and method for flue gas SCR denitrification and efficiency improvement. Background technique [0002] With the development of the national economy, energy consumption is increasing year by year, and the accompanying air pollution problem has gradually become prominent and has become the focus of people's attention. Of which nitrogen oxides (NO x ) is one of the three major air pollutants, which is extremely harmful. Therefore, the country has issued relevant policies and regulations to limit the NOx emissions of thermal power plant boilers. For example, the air pollutant emission standard for thermal power plants (GB13223-2011) requires active thermal power boilers to meet the NOx emission of 100mg / m before July 1, 2014 3 emission limit requirements. [0003] With the implementation an...

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Problems solved by technology

However, the current SCR denitrification system is generally designed according to the BMCR working conditions, so that the denitrification catalyst loading is excessive in most of the time, resulting in high investment costs; at the same time, the large loading volume will increase the cost of catalyst replacement and the flue gas caused by the catalyst. Increased resistance leads to high operating costs of the SCR denitrification system

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