A new type of refractory（lightweight ultra-low thermal conductivity mullite brick） was taken as the research object

the emission reduction benefit and economic benefit of its application on the calcination zone of Φ 4 m×60 m cement rotary kiln were analyzed. The results show that compared with traditional refractory materials

after using lightweight ultra-low thermal conductivity mullite bricks in the calcination zone of cement rotary kiln

it can save about 1 336 t of standard coal and480 000 kW·h of electricity annually

directly or indirectly reduce about 3 920.96 t/a of carbon dioxide emissions

11.36 t/a of sulfur dioxide

and 9.89 t/a of nitrogen oxides

with obvious energy-saving and emission reduction effects; At the same time

it can also reduce the use of refractory materials

reduce the cylinder load

and thus extend the service life of the rotary kiln

with considerable comprehensive economic benefits. Therefore

the application of this new refractory conforms to the policy of "double carbon、 double reduction" in the cement industry

and is one of the effective ways to save energy and reduce emissions in the cement industry.