Loading patent…
AssigneeDürr Systems AG
InventorsUrs HÄSELI, Carsten WALDDÖRFER, Matthias HAGEN
Estimating the term…
The invention relates to a process plant (20) for converting a solid input material into a solid process product. The process plant (20) includes a calciner which is connected to a heat exchanger (26) and to which the input material can be continuously supplied for heating in order to transform the input material into an intermediate product. In the process plant (20) there is a kiln for converting the intermediate product into the process product by means of thermal treatment, raw gas being produced in doing so. The process plant (20) has a raw gas line system (50) comprising a raw gas line (50.1) which extends from the kiln to the calciner and through which the raw gas can flow from the kiln into the calciner for transferring raw gas heat to the input material, and includes a cooling device for cooling the process product after the thermal treatment in the kiln by transferring heat from the process product to a cooling gas containing oxygen, as a result of which a hot gas containing oxygen is generated. According to the invention, in the process plant (20) there is a waste air purification device for oxidizing raw gas, which is connected to the calciner via a raw gas line system (50), wherein a hot gas line system which is used for supplying hot gas generated from the cooling device is attached to the raw gas line system (50). The invention also relates to a method for converting a solid input material into a solid process product and to a method for purifying raw gas produced during the manufacture of cement.
A process plant for converting a solid input material into a solid process product, the process plant comprising:
A method for converting a solid input material into a solid process product, wherein the input material is continuously supplied into a calciner and heated therein to transform the input material into an intermediate product, wherein the intermediate product is converted into the process product in a kiln by thermal treatment with the release of raw gas, wherein the input material is supplied into the calciner through a heat exchanger, which acts as a precalciner, wherein the raw gas is flowed through the calciner for the transfer of raw gas heat to the input material, and wherein the process product is cooled after the thermal treatment in the kiln in a cooling device by a cooling gas containing oxygen, wherein the cooling gas is heated to form hot gas, wherein the raw gas is flowed from the calciner into the heat exchanger for the transfer of raw gas heat to the input material and wherein the raw gas is supplied to a waste air purification device for oxidizing the raw gas through at least one raw gas line in a raw gas line system, wherein the waste air purification device is an RTO device for regenerative thermal raw gas oxidation, wherein the raw gas is mixed with the hot gas after flowing through the calciner and the heat exchanger and supplied to the waste air purification device for oxidizing the raw gas by introducing the hot gas through at least one quaternary air hot gas line into the at least one raw gas line.
A method for purifying raw gas resulting from manufacturing of cement that flows from a heat exchanger into a raw gas line of a raw gas line system, which is connected to a calciner that receives the raw gas from a kiln to which raw meal heated in the heat exchanger and in the calciner is supplied, to convert the raw meal into clinker at a temperature of up to approximately 1,450 degrees Celsius (° C.), wherein the raw gas is released and wherein the raw gas is fed through the raw gas line system to a waste air purification device including an RTO device, wherein oxygen content and a temperature of the raw gas supplied to the waste air purification device are adjusted so that carbon monoxide contained in the raw gas flowing through the raw gas line system is prevented from igniting locally by mixing the raw gas flowing from the heat exchanger with fresh air heated in a clinker cooler.
Dependencies are inferred from the claim text.