The front end of the hybrid SCR - SNCR system is a SNCR system, and the SCR system of the rear end is used for further denitrification of the flue gas, so that the reducing agent is fully utilized.

The process with two reaction zones, through the arrangement of injection system in boiler furnace wall. First of all, the reduction agent is sprayed into the first reaction zone - furnace, under high temperature reducing agent and NOx in the flue gas occurrence of non catalytic reduction reaction, to achieve the initial nitrogen removal. The second reaction zone of the reaction zone which is not finished by the reaction is further removed from the reactor. The most important improvement of the hybrid SCR - SNCR process is eliminating the complex AIG (ammonia injection) system in the flue, and reducing the amount of catalyst used in the SCR process.

SNCR/SCR mixing process characteristics:

Organic combination of the SCR process and the SNCR process is a new technology, which has been successfully developed in the late 90s and has been successfully applied to large scale coal fired units.

SNCR / SCR system, the SNCR phase of the escape of ammonia with flue gas flow downstream of the SCR system, making the use of ammonia more fully

A large amount of catalyst savings

The SNCR / SCR system has greatly reduced the required SCR reaction volume due to the SNCR system in the boiler, thus reducing the cost and space of the SCR system.