Cooperative emission reduction method for sintering using energy-carrying composite gas medium

A cooperative emission reduction method for a sintering using an energy-carrying composite gas medium, comprising:

• introducing energy-carrying composite gas mediums with different compositions and heats to a surface of a sintered material of different sections in a sintering machine according to different flue gas components, temperature characteristics, and heat requirements of the different sections in the sintering machine to replace conventional air for the sintering, to achieve energy consumption reduction and emission reduction,
• wherein:
• a first hot exhaust gas is introduced to the surface of the sintered material in the ignition section for an ignition,
• a composite gas of a second hot exhaust gas and a first hydrogen-rich gas is introduced to the surface of the sintered material in the heat preservation section, a composite gas of a second hydrogen-rich gas and water vapor is introduced to the surface of the sintered material in the middle section, and
• a high-temperature flue gas of the machine tail section and a flue gas of the ignition section and/or the heat preservation section are introduced to the surface of the sintered material in the flue gas heating section,
• the first hot exhaust gas with a temperature of 250-350° C. and an oxygen content of no less than 20% is introduced to the surface of the sintered material in the ignition section,
• the second hot exhaust gas with a temperature of 200-300° C. and an oxygen content of no less than 20% is introduced to the surface of the sintered material in the heat preservation section, and the first hydrogen-rich gas is sprayed in a manner of cascade spraying at the same time,
• the second hydrogen-rich gas is sprayed on the surface of the sintered material in the middle section, and the water vapor with a temperature of no less than 120° C. and a pressure of no less than 0.2 MPa is sprayed in the manner of cascade spraying at the same time, and
• a mixed gas of the high-temperature flue gas of the machine tail section and the flue gas of the ignition section and/or the heat preservation section with a temperature of no less than 120° C., an oxygen content of no less than 17%, and a CO2 content and a water vapor content of no greater than 4% is introduced to the surface of the sintered material in the flue gas heating section,
• the water vapor is sprayed on the surface of the sintered material in the middle section in the manner of cascade spraying, a concentration in volume percent of the water vapor uniformly increases from 0.3-0.4% to 0.7-0.9% in a running direction of the sintering machine, and
• the second hydrogen-rich gas with a concentration in volume percent of 0.2-0.5% is sprayed on the surface the sintered material in the middle section.