Liquid ammonia method SNCR (selective non-catalytic reduction) nitrate removal system suitable for circulating fluidized bed boiler

Abstract

Disclosed is a liquid ammonia method SNCR (selective non-catalytic reduction) nitrate removal system suitable for a circulating fluidized bed boiler. The liquid ammonia method SNCR nitrate removal system suitable for the circulating fluidized bed boiler comprises a liquid ammonia conveying system used to provide a nitrate removal reducing agent, a gas ammonia preparation system connected with an outlet of the liquid ammonia conveying system and used to prepare gas ammonia, a dilution system connected with an outlet of the gas ammonia preparation system and used to dilute the gas ammonia and a jet system connected with an outlet of the dilution system and used to convey the gas ammonia after being diluted into a gas flue. The liquid ammonia method SNCR nitrate removal system suitable for the circulating fluidized bed boiler achieves the purpose of removing nitric oxide in smoke by directly using the gas ammonia, has the advantages of being stable, efficient, low in running cost, simple to control, and high in automatic degree, and can be widely used for nitric oxide removal of the smoke of the circulating fluidized bed boiler used in industries of the electricity industry, the energy and chemical industry and the like.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification, and in particular relates to a liquid ammonia method SNCR denitrification system suitable for circulating fluidized bed boilers. Background technique [0002] At present, the state proposes to control NO during the "12th Five-Year Plan" X emission. According to the requirements of the air pollutant discharge standard for thermal power plants (GB 13223-2011), new thermal power units will be NO from January 1, 2012 X Emissions below 100mg / m 3 (6%O 2 ); active W flame furnace, circulating fluidized bed (CFB) unit NO X Emissions below 200mg / m 3 (6%O 2 ), key areas also implement the requirements for new units. Therefore, a large number of denitrification technologies have emerged as the times require. [0003] Selective non-catalytic reduction (SNCR) is a relatively mature flue gas denitrification process. At present, environmental protection companies use urea or ammonia wa...

AI Technical Summary

Problems solved by technology

The urea denitrification process requires a lot of manpower to prepare urea solution, and has high requirements on the material of the equipment, is easy to crystallize, and is more complicated to control; the ammonia water denitrification process generally purchases about 20% of ammonia water, and 80% of the water in the ammonia water does not Participate in the reduction reaction

Therefore, a lot of resources are wasted to transport useless water during transportation, the waste is very serious

Images