Abstract: A method of heat energy recovery in installations including at least one reformer, wherein, for the purpose of heat energy recovery, process condensate is preheated and/or evaporated on a cooling section of the installation by heat exchange with gas generated in the installation, in particular synthesis gas, wherein, prior to being preheated in a flue gas duct of the installation, combustion air is preheated by heat exchange by means of boiler feed water. The invention also relates to a heat energy recovery system for the implementation of the method.

Abstract: The invention relates to a method for producing syngas in combined operation with a metallurgical plant which comprises at least one blast furnace for producing crude iron, a converter steel mill and a coke-oven plant. Part of the blast-furnace top gas that is produced in the production of crude iron and/or part of the converter gas that occurs in the converter steel mill and/or part of the coke-oven gas that is produced in the coke-oven plant are mixed. By choosing the gas streams that are brought together to form a mixed gas and/or by changing the mixing ratios of the gas streams that are brought together, at least two streams of useful gas are produced, differing with regard to their composition and respectively prepared to form streams of syngas.

Abstract: The invention relates to a plant complex for steel production comprising a blast furnace for producing pig iron, a converter steel mill for producing crude steel and a gas-conducting system for gases that occur in the production of pig iron and/or in the production of crude steel. According to the invention, the plant complex additionally has a chemical or biotechnological plant connected to the gas-conducting system and a plant for producing hydrogen. The plant for producing hydrogen is connected to the gas-conducting system by a hydrogen-carrying line. Also the subject of the invention is a method for operating the plant complex.

Abstract: A method of heat energy recovery in installations including at least one reformer, wherein, for the purpose of heat energy recovery, process condensate is preheated and/or evaporated on a cooling section of the installation by heat exchange with gas generated in the installation, in particular synthesis gas, wherein, prior to being preheated in a flue gas duct of the installation, combustion air is preheated by heat exchange by means of boiler feed water. The invention also relates to a heat energy recovery system for the implementation of the method.

Abstract: The invention relates to a process for preparing ammonia gas and CO2 for urea synthesis. In the process of the invention, a process gas containing nitrogen, hydrogen and carbon dioxide as main components is produced from a metallurgical gas. The metallurgical gas consists of blast furnace gas, or contains blast furnace gas at least as a mixing component. The process gas is fractionated to give a gas stream containing the CO2 component and a gas mixture consisting primarily of N2 and H2. An ammonia gas suitable for the urea synthesis is produced from the gas mixture by means of ammonia synthesis. CO2 is branched off from the CO2-containing gas stream in a purity and amount suitable for the urea synthesis.

Abstract: The invention relates to a process for preparing ammonia gas and CO2 for urea synthesis. In the process of the invention, a process gas containing nitrogen, hydrogen and carbon dioxide as main components is produced from a metallurgical gas. The metallurgical gas consists of blast furnace gas, or contains blast furnace gas at least as a mixing component. The process gas is fractionated to give a gas stream containing the CO2 component and a gas mixture consisting primarily of N2 and H2. An ammonia gas suitable for the urea synthesis is produced from the gas mixture by means of ammonia synthesis. CO2 is branched off from the CO2-containing gas stream in a purity and amount suitable for the urea synthesis.

Abstract: The invention relates to a method for producing syngas in combined operation with a metallurgical plant which comprises at least one blast furnace for producing crude iron, a converter steel mill and a coke-oven plant. Part of the blast-furnace top gas that is produced in the production of crude iron and/or part of the converter gas that occurs in the converter steel mill and/or part of the coke-oven gas that is produced in the coke-oven plant are mixed. By choosing the gas streams that are brought together to form a mixed gas and/or by changing the mixing ratios of the gas streams that are brought together, at least two streams of useful gas are produced, differing with regard to their composition and respectively prepared to form streams of syngas.

Abstract: The invention relates to a process for preparing ammonia gas and CO2 for urea synthesis. In the process of the invention, a process gas containing nitrogen, hydrogen and carbon dioxide as main components is produced from a metallurgical gas. The metallurgical gas consists of blast furnace gas, or contains blast furnace gas at least as a mixing component. The process gas is fractionated to give a gas stream containing the CO2 component and a gas mixture consisting primarily of N2 and H2. An ammonia gas suitable for the urea synthesis is produced from the gas mixture by means of ammonia synthesis. CO2 is branched off from the CO2-containing gas stream in a purity and amount suitable for the urea synthesis.

Abstract: The invention relates to a method for reducing CO2 emissions in the operation of a metallurgical plant which comprises at least one blast furnace for producing crude iron and a converter steel mill for producing crude steel. According to the invention, at least a partial amount of the blast-furnace top gas that occurs in the blast furnace in the production of crude iron and/or a partial amount of the converter gas that occurs in the production of crude steel is taken for producing syngas that is used for producing chemical products. At the same time, the energy demand of the metallurgical plant is at least partly covered by using electricity that is obtained from renewable energy.

Abstract: The invention relates to a plant complex for steel production comprising a blast furnace for producing pig iron, a converter steel mill for producing crude steel and a gas-conducting system for gases that occur in the production of pig iron and/or in the production of crude steel. According to the invention, the plant complex additionally has a chemical or biotechnological plant connected to the gas-conducting system and a plant for producing hydrogen. The plant for producing hydrogen is connected to the gas-conducting system by a hydrogen-carrying line. Also the subject of the invention is a method for operating the plant complex.