System

Abstract

System comprehensive - a first production line with at least one process stream; and - a second production line with at least one process stream; and - at least one interconnection of the at least one process stream of the first production line with the at least one process stream of the second production line, in particular to increase the efficiency of the system.

Description

[0001] The present invention relates to a system of two production lines with increased efficiency.

[0002] Process plants with systems consisting of two or more production lines are used particularly in the cement industry, for example for the production of various products such as clinker and lime.

[0003] State-of-the-art measures to increase the efficiency of production lines have become known. For example, products from one production line can serve as reactants for another, thereby increasing economic efficiency.

[0004] The present invention is based on the object of providing an improved system which in particular has increased efficiency, in particular increased energy efficiency.

[0005] The system according to the invention comprises: - a first production line with at least one process stream; and - a second production line with at least one process stream; and - at least one interconnection of the at least one process stream of the first production line with the at least one process stream of the second production line, in particular to increase the efficiency of the system.

[0006] Advantageously, a production line comprises one or more process steps through which one or more process streams pass. Advantageously, a process stream is formed by a transport variable of the process line. In particular, a transport variable is transported through the process line, preferably one or more process steps, or is also generated therein. In particular, a transport variable is formed by a substance such as flue gas, water, in particular with carbon dioxide or clinker or lime, or heat, electrical energy, or mechanical energy.

[0007] Advantageously, the first production line comprises a production line for producing clinker. Preferably, the second production line comprises a production line for producing lime. Advantageously, a transport variable of a process stream of the first production line is formed by a flue gas stream. Advantageously, a transport variable of a process stream of the first production line is formed by heat. Preferably, a transport variable of the second process stream of the second production line is formed by flue gas.

[0008] Advantageously, the interconnection is achieved at least by transferring a process stream with the transport variable heat between the first production line and the second production line. In particular, the interconnection is achieved at least by transferring the process stream with the transport variable heat from the first production line to the second production line.

[0009] The second production line preferably comprises an amine scrubber for separating carbon dioxide from the flue gas of the process stream of the second production line. In particular, the process stream is transferred with the transport variable heat to the amine scrubber for separating carbon dioxide from the flue gas of the process stream of the second production line. Carbon dioxide separated by the amine scrubber advantageously forms a transport variable of a process stream of the second production line. The transferred heat can advantageously be used for the post-treatment of a process stream to increase the efficiency of the system, in particular of the amine scrubber.

[0010] In particular, the clinker production line includes a kiln that is essentially operated with pure oxygen. Such a kiln is also referred to as an oxyfuel kiln. Large amounts of heat are advantageously generated during the combustion of oxygen in the oxyfuel kiln. The generated heat advantageously forms a transport variable for a process stream that can be transferred. In particular, the process stream can be transferred to the amine scrubber using the transport variable heat. This advantageously increases the efficiency of the system.

[0011] Advantageously, the clinker production line comprises a process stream that includes flue gas as a transport variable. In particular, the flue gas has a high proportion of carbon dioxide as a transport variable. In particular, the process stream is formed by the flue gas produced during combustion in the oxyfuel kiln.

[0012] Preferably, interconnecting the first production line and the second production line comprises combining the process streams with the transport variable carbon dioxide emerging from the amine scrubber and the oxyfluid furnace. Advantageously, the process streams can be combined into a single process stream. This can advantageously increase the efficiency of the system. Advantageously, the combined process stream can be further processed. Preferably, the combined process stream with carbon dioxide as a transport variable is further processed by further increasing the purity of the carbon dioxide, liquefaction, and / or storage or utilization.

[0013] Further features and advantages of the invention will become apparent from the following description of synergies in the integration of carbon dioxide capture systems on multiple production lines.

[0014] The path to climate neutrality in the cement and lime industries presents a particular challenge, as the majority of carbon dioxide emissions are primarily attributable to raw material-related emissions from limestone deacidification. Carbon capture and storage (CCS) therefore plays a crucial role in these industries' efforts to achieve climate neutrality. The selection of a suitable capture technology depends on site- and plant-specific conditions. Many sites have multiple production lines or products whose manufacture generates significant carbon dioxide emissions.

[0015] The spatial proximity of carbon dioxide-intensive processes at a single site advantageously enables the shared and efficient use of facilities and infrastructure, as well as synergies with regard to the production and use of consumables, waste heat, or other by-products. Particular advantages can arise from combining different carbon dioxide capture processes. Combining the exhaust gas paths of several production lines, in particular, offers significant potential for reducing the required plant technology and optimizing energy consumption.

[0016] A common combination of production processes at a single site, resulting from the use of limestone as a raw material, is advantageously the combination of cement clinker and lime production. Due to the larger production volumes, clinker production usually generates a significantly larger carbon dioxide stream than lime production.

[0017] Due to the often lower absolute carbon dioxide quantity and simultaneously higher product-related carbon dioxide density of lime production compared to clinker production, the installation of separate capture plants leads, in particular, to higher specific costs for carbon dioxide capture from lime production. By combining the exhaust gas lines and jointly using a capture or carbon dioxide processing plant, the carbon dioxide avoidance costs are reduced due to economies of scale, particularly for lime production. In addition, the consolidation of smaller carbon dioxide sources facilitates the development of the carbon dioxide infrastructure, as the number of emitters to be connected is preferably reduced. This synergy is advantageous but not limited to lime production.Other combustion processes can also be advantageously decarbonized, particularly efficiently, if suitable processes are combined.

[0018] In the cement industry, numerous projects are currently being planned that advantageously utilize oxyfuel technology for carbon dioxide enrichment in the exhaust stream of a cement clinker production plant. The carbon dioxide-rich exhaust gas from such a plant can be concentrated in a cryogenic carbon dioxide processing plant (CPU) to the required purity for storage and, in particular, cooled and compressed for transport. At an integrated site, consisting in particular of an oxyfuel process for the production of cement clinker and a conventionally operated lime kiln or other combustion facility with an end-of-pipe solution for carbon dioxide enrichment, various plant components of the exhaust gas purification system or the CPU of the oxyfuel process can be used jointly. The combination possibilities are particularly diverse within the scope of the technology selection for the end-of-pipe solution.By choosing between membrane processes, PSA / TSA processes or amine washing, etc., further usable synergy effects can be achieved.

[0019] Complete capture of carbon dioxide from clinker production by means of amine scrubbing generally fails due to the high thermal energy requirement of the amine scrubbing, which can usually only be covered to a maximum of 50% by the waste heat from the clinker combustion process. In contrast, this waste heat is often sufficient to cover the entire heat requirement of the amine scrubbing for carbon dioxide capture from the exhaust gas of the lime kiln or a comparable combustion process. In particular, the construction of a heat shift system and the heat integration of the amine scrubbing from the accompanying process would enable this energy to be used with maximum efficiency, while the accompanying process would be advantageously decarbonized with minimal energy and equipment expenditure. Alternatively or in addition to heat, other material flows or energy flows can also be exchanged, particularly between the two processes or with the CPU, in order to advantageously utilize further synergy effects.

[0020] In addition to increased energy efficiency, the interconnection of processes can be used, in particular, to advantageously improve the separation rate. Viewed in isolation, many separation technologies preferably have a maximum separation efficiency of 90%-95%. The combination of different processes advantageously enables the post-treatment of escaping gas streams with a residual carbon dioxide load, particularly in the subsequent process. For example, the gas stream exiting the CPU with a residual carbon dioxide load (CPU slipstream) can be fed to the amine scrubber to significantly increase the separation efficiency of the plant network.

[0021] Further features and advantages of embodiments of the invention are described below with reference to the drawings. The same reference numerals are used for identical or similar parts and for parts with identical or similar functions. They show: Fig. 1 a schematic diagram of a system according to the invention.

[0022] It is not necessary for a system according to the invention to have all of the features described below. It is also possible for a system according to the invention to have only individual features of the exemplary embodiments described below.

[0023] Fig.1 shows a schematic circuit diagram of a system 100 according to the invention. The system 100 according to the invention comprises a first production line 1 with at least process streams 8, 9, 13 and a second production line 2 with at least one process stream 10, 11, 12. Here, at least one interconnection of a process stream 9 of the first production line 1 with a process stream 11 of the second production line 2 is present to increase the efficiency of the system 100.

[0024] The first production line 1 comprises a production line 3 for producing clinker with a corresponding process stream 13 with the transport variable of clinker. The second production line 2 comprises a production line for producing lime 4 with a corresponding process stream 12 with the transport variable of lime and a process stream 11 with flue gas with carbon dioxide as the transport variable. A transport variable of a process stream 8 of the first production line 1 is formed by flue gas. A transport variable of a process stream 9 of the first production line 1 is formed by heat. A transport variable of the process stream 11 of the second production line 2 is formed by flue gas.

[0025] The connection is achieved here by transferring a process stream 9 with the transport quantity heat from the first production line 1 to the second production line 2. Heat transfer is advantageously carried out using thermal oil or steam as the heat transfer medium.

[0026] The second production line 2 here comprises an amine scrubber 6 for separating carbon dioxide from the flue gas of the process stream 11 of the second production line 2. The process stream 9 is transferred with the transport variable heat to the amine scrubber 6 for separating carbon dioxide from the flue gas of the process stream 11 of the second production line 2. Carbon dioxide separated by the amine scrubber 6 advantageously forms a transport variable of a process stream 10 of the second production line 2.

[0027] Production line 3 for clinker production includes an oxyfuel kiln. Large amounts of heat are advantageously generated during the combustion of oxygen in the oxyfuel kiln. The generated heat advantageously forms a transport variable for a process stream 9, which is transferable, here via a heat exchanger 5. Process stream 9, with the transport variable heat, is transferred to the amine scrubber 6.

[0028] Production line 3 for clinker production comprises a process stream 8, which contains flue gas as a transport variable. The flue gas has a high proportion of carbon dioxide as a transport variable. Process stream 8 is formed by the flue gas produced during combustion in the oxyfuel kiln.

[0029] Preferably, interconnection of the first production line 1 and the second production line 2 comprises combining process streams 8 and 10 with the transport variables carbon dioxide, which exit from the amine scrubber 6 and the oxyfluid furnace. Advantageously, the process streams can be combined into a combined process stream 14. This can advantageously increase the efficiency of the system. Here, the combined process stream 14 with carbon dioxide as the transport variable is further processed by purification, liquefaction, and / or storage in a separate plant 7. Additionally, a return of a process stream 15 with a residual load of carbon dioxide as the transport variable to the amine scrubber 6 is also possible.Advantageously, the separation of carbon dioxide can be continued in the separate plant 7, in particular when the second production line 2, in particular the amine wash 6, is at least partially not in operation or no process stream 15 is available for recirculation to the amine wash 6. Reference symbol: 1 first production line 2 second production line 3 Production line for the production of clinker 4 Production line for the production of lime 5 heat exchangers 6 Amine wash 7 Separate plant for liquefaction and storage 8 Process stream with transport size flue gas with carbon dioxide 9 Process stream with transport quantity heat 10 Process stream with transport quantity carbon dioxide 11 Process stream with transport size flue gas with carbon dioxide 12 Process stream with transport size lime 13 Process stream with transport size clinker 14 Process stream with transport quantity carbon dioxide 15 Process stream with the transport quantity carbon dioxide for recirculation to the amine wash 100 systems

Claims

[1] System comprehensive - a first production line with at least one process stream; and - a second production line with at least one process stream; and - at least one interconnection of the at least one process stream of the first production line with the at least one process stream of the second production line, in particular to increase the efficiency of the system.

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