Flue gas SCR denitration efficiency-improving system and method

A denitrification efficiency and denitrification technology, which is applied in the field of flue gas SCR denitrification efficiency improvement system, can solve the problems of high operating cost, increased flue gas resistance, and high investment cost of SCR denitrification system, so as to reduce catalyst loading, investment and operation Cost, effect of high denitrification efficiency

Pending Publication Date: 2018-08-17
XIAN THERMAL POWER RES INST CO LTD
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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 c

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  • Flue gas SCR denitration efficiency-improving system and method
  • Flue gas SCR denitration efficiency-improving system and method

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Embodiment Construction

[0031] Below in conjunction with specific embodiment the present invention is described in further detail, described is explanation of the present invention rather than limitation.

[0032] A flue gas SCR denitrification efficiency improvement system of the present invention comprises high-pressure air 1, distribution module 2, metering and dilution module 3, dilution desalted water tank 4, dilution water pump 5, oxidant tank 6, oxidant pump 7, nozzle system 8;

[0033] The oxidant stored in the oxidant tank 6 is pressurized by the oxidant pump 7 and then sent to the metering and dilution module 3. The oxidant output flow is adjusted according to the oxidant injection amount calculated by the process system, and then mixed with the diluted desalted water tank 4 and the dilution water pump 5. The mixed diluted desalted water is sent to the selected position before the SCR denitrification through the distribution module 2, and is sprayed into the flue through the nozzle system 8 ...

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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...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/8625B01D2251/108B01D2251/2062B01D2251/106B01D2251/104B01D2258/0283
Inventor 马强杨晓刚牛国平
Owner XIAN THERMAL POWER RES INST CO LTD
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