WO 2025/031866 A1

Method for the production of cement clinker by processing
accumulated carbon dioxide in order to form methanol

(22) 29.07.2024

(43) 13.02.2025

(57) The invention relates to a method for producing cement clinker by processing accumulated carbon dioxide in order to form methanol, having the steps of pre-heating a raw meal made of silicate-containing and lime-containing rock in a pre-heater, calcinating the raw meal in a calciner (120), sintering the calcinated raw meal in a rotary furnace (130), the exhaust gas of the rotary furnace (130) reaching the calciner (120) and flowing on from there into the pre-heater, and cooling the sintered cement clinker in a clinker cooler (140), wherein a first portion of the cooling air from the clinker cooler (140), in the form of primary air, flows in a rotary furnace burner (135) in order to heat the rotary furnace (130), a second portion of the cooling air from the clinker cooler (140), in the form of tertiary air, flows to the calciner (120) via a tertiary air line (150). and a third portion of the cooling air is ejected from the clinker cooler (140) as exhaust air or is used to dry electrolysis sludge. The exhaust gas from the pre-heater flows completely or partly and directly or indirectly into a reactor (220) in order to produce methanol (CH3OH) from the carbon dioxide (CO2) and carbon monoxide (CO) contained in the exhaust gas in that the exhaust gas is reacted with hydrogen (H2) in the reactor (220). According to the invention, a high-temperature electrolysis cell (210) is heated with heat from the aforementioned method in order to generate hydrogen (H2) from a pre-heated electrolyte so that the electrolyte is heated to a temperature between 100 °C and 850 °C.

(71) KHD Humboldt Wedag GmbH; 51149 Köln (DE)

(84) ARIPO (BW, CV, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SC. SD, SL, ST, S7, T7, UG, 7M, 7W), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG. CII, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU. IE, IS, IT, LT, LU, LV, MC, ME, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ. GW, KM, ML, MR, NE, SN, TD, TG).

x

Related articles:

Issue 12/2016 EP3074360 (A1)

Process and apparatus for manufacture of Portland cement

(22) 19.11.2014 (45) 05.10.2016 (57) Summary of corresponding patent WO2015077818 (A1): A method of manufacture of Portland cement clinker is described in a dry process that captures the carbon...

more
Issue 02/2024 WO 2024/008350 A1

Method for manufacturing cement clinker and cement plant

(22) 08.05.2023 (43) 11.01.2023 (57) Method for manufacturing cement clinker comprising the steps: preheating a raw meal (rm) in a first preheater (1 ) using kiln off-gas to provide a partially...

more
Issue 7-8/2015 WO?2015/077818?A1

Process and apparatus for manufacture of Portland cement

(22) 19.11.2014 (43) 04.06.2015 (57) A method of manufacture of Portland cement clinker is described in a dry process that captures the carbon dioxide emitted from the calcinations of carbonate...

more
Issue 4/2019 US2019047911 (A1)

Plant for production of cement with reduced emission of pollutant gasses

(22) 12.04.2016 (43) 14.02.2019 (57) A plant for production of cement clinker from raw meal, having a calciner for deacidification of the raw meal and a rotary furnace for sintering the deacidified...

more
Issue 6/2022 WO 2022/126410 A1

Low-energy-consumption carbon-enriched cement production system and method for producing cement clinker

(22) 16.12.2020 (43) 23.06.2022 (57) A low-energy-consumption carbon-enriched cement production system and a method for producing cement clinker. The system comprises: a raw material preheating and...

more