Process and device for carrying out flue gas denitrification by utilizing solid organic denitrifying agent

Abstract

The invention discloses a process and a device for carrying out flue gas denitrification by utilizing a solid organic denitrifying agent. According to the process, an organic denitrifying reducing agent is sprayed into a reaction area at the fume temperature of 500-950 DEG C and gasified and is subjected to selective uncatalyzed reaction with NOx contained in smoke gas, so that the purpose of denitrification is achieved. The core device of the process is highly-integrated integral equipment, is designed according to unit system and mainly comprises a denitrifying agent delivery supply system, a metering distribution system, a fluidic system, a gas delivery system, a chemical agent injection system and an on-line monitoring system. According to the smoke gas denitrification technology of the solid organic denitrifying agent, no change needs to be made on a boiler, and only the injection system needs to be added to the position at the fume temperature of 500-950 DEG C and between the smoke gas outlet of the boiler and a superheater. The process and the device which are disclosed by the invention have the characteristics of low operating cost, high safety, obviousness in denitrification effect and the like.

Description

technical field [0001] The invention relates to the technical field of denitrification of industrial flue gas, and provides a process and a device for denitrification of flue gas by using a solid organic denitrification agent. Background technique [0002] The energy structure dominated by coal is the main factor affecting the quality of my country's atmospheric environment, and coal-burning pollution is the main feature of air pollution. With the improvement of people's awareness of environmental protection and the promulgation and implementation of the government's policy on the maximum allowable emission concentration of sulfur dioxide and nitrogen oxides from boilers, the SO in flue gas 2 and NO x Control has become a very urgent task. [0003] According to the newly promulgated "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011), starting from July 1, 2014, the emission standard of nitrogen oxide pollutants for existing coal-fired thermal p...

AI Technical Summary

Problems solved by technology

[0004] At present, the industrial flue gas denitrification technology mainly adopts the selective catalytic reduction method (SCR method) and the selective non-catalytic reduction method (SNCR method), both of which are harmful to the boiler combustion Due to the requirements of the working conditions, the traditional technology is still in the technical blind spot for the chain furnace

The SCR method is suitable for large pulverized coal furnaces, using catalysts for denitrification, long-term use will easily lead to air preheater blockage

This method usually requires the modification of the induced draft fan and the air preheater. Because the installation location is between the economizer and the air preheater, it is subject to many conditions and has high requirements for the flue gas flow field, which has investment and operating costs. Disadvantages such as high height, large floor area, complex system operation and maintenance

The SNCR method is suitable for circulating fluidized bed boilers, and requires a higher temperature (900~1100°C). Its investment cost is low, but the ammonia escape rate is relatively high, and the denitrification efficiency is relatively low, which cannot meet the requirements and discharge standards

The traditional denitrification process usually uses ammonia water or urea as the reducing agent, which has low storage and transportation safety and a large ammonia escape rate, which increases water consumption and brings great difficulties to subsequent wastewater treatment.

On the other hand, the ammonium sulfate (aerosol) produced during the flue gas treatment and the solid particles adsorbed by the saturated steam formed by a large amount of water will affect the subsequent dust removal device and affect the air volume.

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