WO 2022/053986 A1

Cement kiln bypass emissions reduction

(22) 09.09.2021

(43) 17.03.2022

(57) A bypass system and a process for reducing the formation of ammonium sulphate and ammonium bisulphate in off gases that have exited a cement rotary kiln utilized in a cement making process in conjunction with a calciner that‘s located downstream from the rotary kiln in the direction of gas flow, while concurrently reducing the NOx and volatile content from said off gases, the system comprising a kiln bypass takeoff duct (1) to direct a portion of the kiln off gases having a temperature in the range of from about 950 °C to about 1250 °C into a bypass duct and away from entering the calciner; an injection nozzle (2) to insert a first reducing agent into the so-directed off gases in the bypass duct to begin the reduction of NOx to N2 in said off gases; a first cooling apparatus (3) comprising a gas quenching/ mixing chamber for mixing the directed off gases with cooling gas (4) to cool the off gases to a temperature in the range of about 300 °-450 °C, and a sorbent injection (5) to scrub S02 and S03 from the withdrawn off gases and condense volatiles; a dust separating apparatus (6) to remove dust containing condensed sulfates and volatiles and adsorbed sorbent from said cooled off (…).

(71) FLSmidth A/S, Vigerslev Allé 77, 2500 Valby (DK)

x

Related articles:

Issue 2018-6 EP3294441 (A1)

NOx reduction process in a cement kiln manufacturing system

(22) 09.05.2016 (43) 21.03.2018 (57) Summary of the corresponding patent WO2016183027 (A1): Disclosed is a bypass system for use with off gases that have exited a cement kiln utilized in a cement...

more
Issue 2018-7-8 US 2018/0118617 A1

NOx reduction process in a cement kiln manufacturing system

(22) 09.05.2016 (43) 03.05.2018 (57) Disclosed is a bypass system for use with off gases that have exited a cement kiln utilized in a cement making process. The bypass system is adapted to remove both...

more
Issue 2017-1-2 WO 2016/183027 A1

NOx reduction process in a cement kiln manufacturing system

(22) 09.05.2016 (43) 17.11.2016 (57) Disclosed is a bypass system for use with off gases that have exited a cement kiln utilized in a cement making process. The bypass system is adapted to remove both...

more
Issue 2016-12 WO 2016/139225 A1

Method and plant for denitrifying bypass gases in a multi-stage system of mixing chambers in a plant for producing cement clinker

(22) 02.03.2016 (43) 09.09.2016 (57) The invention relates to a method and to a corresponding plant for denitrifying bypass exhaust gases (9) in a plant for producing cement clinker, wherein the plant...

more
Issue 2019-9 US 2019/0154335 A1

Method and plant for denitrifying bypass gases in a multi-stage system of mixing chambers in a plant for producing cement clinker

(22) 25.01.2019 (43) 23.05.2019 (57) A method and a corresponding plant for denitrifying bypass exhaust gases in a cement clinker production plant. Raw meal is sintered in a rotary kiln and...

more