Integrated system for a cement process

Abstract

This invention relates to an integrated system for cement production processes, comprising a solid oxide electrolytic cell, a first waste heat recovery and vaporizer, and a second waste heat recovery and vaporizer. The first waste heat recovery and vaporizer receives water and a first gas generated in the cement production process at a first temperature, generating a first steam stream, which is then fed into the second waste heat recovery and vaporizer. The second waste heat recovery and vaporizer receives water and a second gas generated in the cement production process at a second temperature higher than the first temperature, generating a second steam stream, which is mixed to generate a third steam stream, which is then fed into the electrolytic cell. The electrolytic cell generates hydrogen and oxygen through an electrolytic reaction. The hydrogen and oxygen generated by the electrolytic reaction serve as green fuel and combustion aid in the cement production process. This system utilizes the high-temperature waste heat from the cement production process to heat the solid oxide electrolytic cell, improving the energy efficiency of the electrolytic cell and further enhancing the energy-saving and carbon-reducing effects in the cement production process.

Description

Technical Field

[0001] This invention relates to the field of cement processing, and more specifically to an integrated system for cement processing that deeply integrates a solid oxide electrolysis cell (SOEC) with the cement process. Background Technology

[0002] Cement production consumes a large amount of energy and generates significant amounts of carbon dioxide. The burners used in cement production largely rely on coal, natural gas, or other fossil fuels, and the heat generated from combustion is supplied to rotary kilns or calciners to produce cement clinker. Currently, high-temperature waste heat from the clinker production process is typically recovered and utilized through multi-stage heat exchangers and waste heat boilers.

[0003] SOEC is a device that electrolyzes water vapor into hydrogen and oxygen at high temperatures. Compared with other water electrolysis hydrogen production devices such as proton exchange membrane electrolyzers and alkaline electrolyzers, SOEC has higher electrolysis efficiency and can make full use of high-temperature waste heat and high-temperature water vapor from industrial processes, thus optimizing the overall energy efficiency of the system.

[0004] Currently, various technological measures have been proposed for energy conservation and carbon reduction in the cement industry, including raw material substitution, waste heat recovery and gasification, and new energy substitution. However, the energy conservation and carbon reduction effects of these measures are not ideal and there is room for improvement.

[0005] Therefore, this invention proposes to deeply integrate cement production process with SOEC technology, so as to utilize the high-temperature waste heat and high-temperature steam of cement production process to improve the electrolysis efficiency of SOEC, and use the hydrogen and oxygen generated by SOEC electrolysis to further reduce the fossil fuels used in cement production process, thereby further enhancing the energy-saving and carbon-reducing effects. Summary of the Invention

[0006] The embodiments of the present invention provide an integrated system for cement processes, which at least solves the problems of difficulty in improving the electrolysis efficiency of solid oxide electrolyzers and unsatisfactory energy-saving and carbon-reduction effects in cement processes in the prior art.

[0007] According to one aspect of the invention, an integrated system for a cement process is provided. The integrated system includes a waste heat recovery and vaporization unit and a solid oxide electrolysis cell. The waste heat recovery and vaporization unit includes a first waste heat recovery and vaporization unit, a first receiving pipe and a first water inlet pipe disposed at the receiving end of the first waste heat recovery and vaporization unit, a first conveying pipe disposed at the output end of the first waste heat recovery and vaporization unit, a second waste heat recovery and vaporization unit, a second receiving pipe and a second water inlet pipe disposed at the receiving end of the second waste heat recovery and vaporization unit, and a second conveying pipe disposed at the output end of the second waste heat recovery and vaporization unit. The first waste heat recovery and vaporization unit is configured to receive water from the surface through the first water inlet pipe and to receive a first gas with a first temperature generated in the cement process through the first receiving pipe. Water absorbs heat from a first gas and vaporizes to generate a first steam stream; a first waste heat recovery and vaporizer sends the first steam stream through a first conveying pipe to a second waste heat recovery and vaporizer; the second waste heat recovery and vaporizer is configured to receive water from the ground through a second inlet pipe and receive a second gas with a second temperature higher than the first temperature generated in the cement process through a second receiving pipe, wherein water absorbs heat from the second gas and vaporizes to generate a second steam stream in the second waste heat recovery and vaporizer; a mixer included in the second waste heat recovery and vaporizer receives the first steam stream to mix with the second steam stream to generate a third steam stream, and sends the third steam stream through a second conveying pipe to a solid oxide electrolysis cell; the solid oxide electrolysis cell receives the third steam stream and receives electricity from a power source through an electric line, and generates hydrogen and oxygen through an electrolysis reaction.

[0008] In this way, the integrated system for cement production of the present invention recovers high-temperature waste heat from the cement production process and generates high-temperature steam through a waste heat recovery and vaporization unit. The high-temperature steam is then fed into the solid oxide electrolytic cell as an electrolytic feedstock, thereby improving the electrolysis efficiency of the solid oxide electrolytic cell.

[0009] According to an exemplary embodiment of the present invention, the invention further includes a cement production unit that performs a cement process, and a burner included in the cement production unit receives at least one of hydrogen, oxygen, and combinations thereof.

[0010] In this way, the burner in the cement production unit of the present invention receives oxygen or hydrogen generated by the solid oxide electrolysis cell, or simultaneously receives oxygen and hydrogen. Hydrogen is used as an alternative fuel for the burner, and oxygen is used as a combustion aid for the burner. By partially replacing fossil fuels, the cement process can reduce carbon emission intensity, thus achieving the effect of energy saving and carbon reduction.

[0011] According to an exemplary embodiment of the present invention, a third steam stream is delivered to the cathode of a solid oxide electrolytic cell via a second delivery pipe.

[0012] In this manner, the third steam stream of an embodiment of the present invention is sent to the cathode of a solid oxide electrolytic cell for high-temperature electrolysis into hydrogen and oxygen under the action of electricity.

[0013] According to an exemplary embodiment of the present invention, the power source is a steam turbine, a sub-pipe of the second delivery pipe is connected to the input end of the steam turbine, an electric line is connected to the output end of the steam turbine, and a third steam flow is sent to the steam turbine through the sub-pipe of the second delivery pipe to generate electricity.

[0014] In this way, the steam turbine of the embodiment of the present invention generates electricity by utilizing the heat of the third steam stream, making full use of the high-temperature waste heat in the cement production process.

[0015] According to an exemplary embodiment of the present invention, the power source is a renewable energy power generation device.

[0016] In this way, the power source of embodiments of the present invention can be a renewable energy power generation device in addition to a steam turbine, making the integrated system of the present invention more widely applicable.

[0017] According to an exemplary embodiment of the present invention, the device further includes an electric heater, an air delivery pipe disposed at the input end of the electric heater, an electric power line, and a third delivery pipe disposed at the output end of the electric heater. The electric heater receives air from the external environment through the air delivery pipe, receives electricity through the electric power line to heat the air, and sends the heated air into the anode of the solid oxide electrolytic cell through the third delivery pipe.

[0018] In this manner, the electric heater of an embodiment of the present invention receives air, heats the air using electricity received from a power source, and then sends the air into the anode of a solid oxide electrolytic cell. By heating the air, the electrolytic cell's temperature is increased; that is, the heated air serves as a heat source, being introduced into the electrolytic cell during the start-up heating phase or when additional heating is needed during operation. This ensures that the electrolytic cell always operates within its operating temperature range, which helps improve the electrolytic efficiency and extend the cell's lifespan.

[0019] According to an exemplary embodiment of the present invention, the device further includes a heat exchanger disposed between the air delivery pipe and the electric heater and connected in series with the electric heater, a fourth receiving pipe disposed at the input end of the heat exchanger, and a fourth delivery pipe disposed at the output end of the heat exchanger. The heat exchanger receives air from the external environment through the air delivery pipe, receives a second gas with a second temperature through the fourth receiving pipe to heat the air, and sends the heated air into the electric heater through the fourth delivery pipe for secondary heating.

[0020] In this way, the heat exchanger of the embodiment of the present invention uses the high-temperature waste heat generated in the cement production process as a heat source to heat the air. The heated air is then heated a second time by an electric heater, which further increases the temperature of the air. This secondary heating of the air can more effectively ensure that the electrolysis reaction can be carried out within the working temperature range, which further helps to improve the electrolysis efficiency of the electrolytic cell and extend the life of the electrolytic cell.

[0021] According to an exemplary embodiment of the present invention, renewable energy power generation equipment includes wind power generation equipment and photovoltaic power generation equipment.

[0022] In this way, the power supply options in embodiments of the present invention include a variety of types, including environmentally friendly power supplies that help reduce carbon dioxide emissions.

[0023] According to an exemplary embodiment of the present invention, it further includes a power conversion and control unit, which converts electrical energy provided by the renewable energy power generation equipment into electrical energy that can be used by the solid oxide electrolyzer.

[0024] In this way, the power conversion and control unit of the embodiments of the present invention can perform the required conversion of electrical energy according to the power used by the solid oxide electrolyzer, so that the integrated system of the present invention can be applied to more scenarios.

[0025] According to an exemplary embodiment of the present invention, the cement production unit further includes a preheating tower and a cooler, wherein the preheating tower generates a first gas having a temperature between 300-400°C and the cooler generates a second gas having a temperature between 400-500°C.

[0026] In this manner, in embodiments of the present invention, the first gas originates from a preheating tower, and the second gas originates from a cooler.

[0027] In embodiments of the present invention, a technical solution is provided that generates steam by recovering high-temperature waste heat in the cement process through waste heat recovery and vaporizer, and improves the electrolysis efficiency of the electrolytic cell by using the steam as an electrolysis raw material, and further utilizes the electrolysis products to make cement production more energy-saving and carbon-reducing. This solution at least solves the technical problems of difficulty in improving the electrolysis efficiency of solid oxide electrolytic cells and unsatisfactory energy-saving and carbon-reducing effects in cement processes in the prior art, and achieves the technical effect of improving the electrolysis efficiency of solid oxide electrolytic cells and further enhancing the energy-saving and carbon-reducing effects of cement processes. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0029] Figure 1This is a schematic diagram illustrating an integrated system for cement processing according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram illustrating an integrated system for cement processes, including a cement production unit, according to an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram showing the cathode of a solid oxide electrolytic cell according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram illustrating an integrated system for cement processing that uses a steam turbine as a power source according to an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram illustrating an integrated system for cement processing that uses renewable energy as a power source according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram illustrating an integrated system for cement processing including an electric heater according to an embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram illustrating an integrated system for cement processing including a heat exchanger and an electric heater connected in series according to an embodiment of the present invention;

[0036] Figure 8 This is a schematic diagram illustrating the control of a solid oxide electrolyzer by a power conversion and control unit according to an embodiment of the present invention.

[0037] List of reference numerals in the attached diagram:

[0038] 1: Integrated systems for cement processes;

[0039] 11: Waste heat recovery and vaporization unit;

[0040] 12: Solid oxide electrolytic cell;

[0041] 13: Cement production unit;

[0042] 14: Steam turbine;

[0043] 15: Renewable energy power generation equipment;

[0044] 16: Electric heater;

[0045] 17: Heat exchanger;

[0046] 18: Power conversion and control unit;

[0047] 111: First waste heat recovery and vaporizer;

[0048] 112: Second waste heat recovery and vaporizer;

[0049] 121: Cathode;

[0050] 122: Anode;

[0051] 161: Air delivery duct;

[0052] 162: Power line;

[0053] 163: Third transport pipeline;

[0054] 171: Fourth receiving channel;

[0055] 172: Fourth transport pipeline;

[0056] 1610: Air;

[0057] 1611: Heated air;

[0058] 1612: Heated air;

[0059] 1111: First receiving channel;

[0060] 1112: First water inlet pipe;

[0061] 1113: First transport pipeline;

[0062] 1121: Second receiving pipe;

[0063] 1122: Second water inlet pipe;

[0064] 1123: Second transport pipeline;

[0065] 11231: Sub-pipe;

[0066] 1124: Power line;

[0067] 2001: First Gas;

[0068] 2002: Water;

[0069] 2003: First steam flow;

[0070] 2004: Second gas;

[0071] 2005: Third steam flow;

[0072] 2006: Electricity;

[0073] 1221: Hydrogen;

[0074] 1222: Oxygen. Detailed Implementation

[0075] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings to facilitate implementation by those skilled in the art. However, the present invention can be embodied in many different forms and should not be construed as limited to the embodiments described herein. In the drawings, portions unrelated to the description of the invention will be omitted for clarity. Similar reference numerals refer to similar elements throughout the description. Furthermore, in the description provided with reference to the accompanying drawings, although elements are represented by the same numerals, the reference numerals relating to elements may be varied, and the reference numerals are described only for convenience of description and should not be construed as limiting the concept, feature, function, or effect of the elements to the reference numerals.

[0076] According to one aspect of the invention, an integrated system 1 for cement processing is provided. The integrated system 1 includes a waste heat recovery and vaporization unit 11 and a solid oxide electrolysis cell 12. The waste heat recovery and vaporization unit 11 includes a first waste heat recovery and vaporization unit 111, a first receiving pipe 1111 and a first water inlet pipe 1112 disposed at the receiving end of the first waste heat recovery and vaporization unit 111, a first conveying pipe 1113 disposed at the output end of the first waste heat recovery and vaporization unit 111, and a second waste heat recovery and vaporization unit 112. A second receiving pipe 1121 and a second water inlet pipe 1122 are located at the receiving end of the second waste heat recovery and vaporization unit 112, and a second conveying pipe 1123 is located at the output end of the second waste heat recovery and vaporization unit 112; the first waste heat recovery and vaporization unit 111 is configured to receive water 2002 from the ground through the first water inlet pipe 1112, and to receive a first gas 2001 with a first temperature generated in the cement process through the first receiving pipe 1111, wherein water absorbs the first gas 2001 in the first waste heat recovery and vaporization unit 111. The heat of 001 is vaporized to generate a first steam stream 2003; the first waste heat recovery and vaporizer 111 sends the first steam stream 2003 into the second waste heat recovery and vaporizer 112 through a first conveying pipe 1113; the second waste heat recovery and vaporizer 112 is configured to receive water 2002 from the surface through a second inlet pipe 1122 and receive a second gas 2004 generated in the cement process with a second temperature higher than the first temperature through a second receiving pipe 1121, wherein water in the second waste heat recovery and vaporizer 112... The second gas 2004 is vaporized to generate a second steam stream; the mixer included in the second waste heat recovery and vaporizer 112 receives the first steam stream 2003 and mixes it with the second steam stream to generate a third steam stream 2005, and sends the third steam stream 2005 into the solid oxide electrolytic cell 12 through the second conveying pipe 1123; the solid oxide electrolytic cell 12 receives the third steam stream 2005 and receives power 2006 from the power source through the power line 1124, and generates hydrogen 1221 and oxygen 1222 through the electrolysis reaction.

[0077] Figure 1 This is a schematic diagram illustrating an integrated system for cement processing according to an embodiment of the present invention.

[0078] In the cement production process, different stages generate gases at different temperatures. For example, the flue gas discharged from the preheating tower stage has a temperature of 300-400℃, and will be referred to as the first gas 2001 with a first temperature below. The gas discharged from the cooler stage has a temperature of 400-500℃, and will be referred to as the second gas 2004 with a second temperature different from the first temperature below. In the following text, the pipeline can be implemented as a pipe network, and the waste heat recovery and vaporizer can be implemented as a waste heat recovery boiler.

[0079] like Figure 1 As shown, in the integrated system 1 for cement processing, a first waste heat recovery and vaporizer 111 receives the first gas 2001 via a first receiving pipe 1111. Simultaneously, the first waste heat recovery and vaporizer 111 also receives water 2002 from the ground via a first water inlet pipe 1112; this water is ordinary tap water. Because the temperature of the first gas 2001 is higher than that of the water, the water absorbs heat from the first gas 2001, thereby vaporizing into a first steam stream 2003. The first waste heat recovery and vaporizer 111 transports the first steam stream 2003 to a second waste heat recovery and vaporizer 112 via a first conveying pipe 1113. The mixer of the second waste heat recovery and vaporizer 112 receives the first steam stream 2003. Furthermore, the second waste heat recovery and vaporizer 112 also receives a second gas 2004 with a second temperature, for example, higher than the first temperature, via a second receiving pipe 1121, and receives ordinary tap water 2002 via a second water inlet pipe 1122, which may be the same as or different from the first water inlet pipe 1112. The cooler water 2002 absorbs heat from the warmer second gas 2004, vaporizes, and generates a second steam stream. The temperature of this second steam stream is different from that of the first steam stream, for example, higher than the first steam stream. The two steam streams are mixed in a mixer, whereby the first steam stream with a relatively lower temperature is further heated by heat exchange. The resulting third steam stream 2005 has a temperature between that of the first steam stream 2003 and the second steam stream, and is sent to the solid oxide electrolysis cell 12 via a second conveying pipe 1123.

[0080] Solid oxide electrolyzer 12 (SOEC) is a device that electrolyzes water vapor into hydrogen and oxygen at high temperatures (700-800°C). Compared to other water electrolysis hydrogen production devices, SOEC has higher electrolysis efficiency, faster response speed, and a wider power operating range. SOEC 12 receives power 2006 from a power source, such as direct current, via power line 1124. Under the action of the power, SOEC 12 electrolyzes the high-temperature third steam stream 2005 to produce hydrogen 1221 and oxygen 1222.

[0081] The integrated system for cement production of this invention deeply integrates SOEC water electrolysis hydrogen production device with cement production process. It recovers high-temperature waste heat in cement production process and generates high-temperature steam through waste heat recovery and vaporization unit. The high-temperature steam is sent into solid oxide electrolysis cell as electrolysis raw material, which reduces the consumption of preheating water and steam and improves the electrolysis efficiency of solid oxide electrolysis cell.

[0082] According to an exemplary embodiment of the invention, a cement production unit 13 is also included, which performs a cement process, and the burner included in the cement production unit 13 receives at least one of hydrogen 1221, oxygen 1222, and combinations thereof.

[0083] Figure 2 This is a schematic diagram illustrating an integrated system for cement processes, including a cement production unit, according to an embodiment of the present invention.

[0084] like Figure 2 As shown, the cement production unit 13 adopts a conventional process flow, mainly including a preheating tower, rotary kiln, cooler, burner, etc. These are not shown in detail here. The cement production unit 13 performs cement-related processes and generates the aforementioned first gas 2001 and second gas 2004. In this invention, at least one of the generated hydrogen 1221, oxygen 1222, and combinations thereof is fed into the cement production unit 13.

[0085] In the cement production unit of this invention, the burner receives oxygen or hydrogen generated by the solid oxide electrolysis cell, or simultaneously receives oxygen and hydrogen. Hydrogen serves as an alternative fuel for the burner, and oxygen serves as a combustion aid for the burner. By partially replacing fossil fuels, this helps the cement process reduce carbon emission intensity, achieving energy conservation and carbon reduction.

[0086] According to an exemplary embodiment of the present invention, a third steam stream 2005 is delivered to the cathode 121 of the solid oxide electrolytic cell 12 via a second delivery pipe 1123.

[0087] Figure 3 A schematic diagram of the cathode of a solid oxide electrolytic cell according to an embodiment of the present invention is shown.

[0088] SOEC 12 includes SOEC stack modules and cathode and anode inlet and outlet gas pipelines. The SOEC stack module is the site of the electrolysis reaction and is composed of several SOEC stacks connected in series and parallel. For example... Figure 3 As shown, the third steam stream 2005 is fed into the cathode of the SOEC stack module, where it is electrolyzed into hydrogen and oxygen by direct current at high temperature. Hydrogen and a small amount of unreacted water vapor are discharged from the cathode outlet. Some of the hydrogen can be used as alternative fuel in the burner of cement production unit 13, and some can be dried and sold to increase revenue. The operating temperature of SOEC 12 can be selected from 600-1000℃.

[0089] According to an exemplary embodiment of the present invention, the power source is a steam turbine 14, a sub-pipe 11231 of the second conveying pipe 1123 is connected to the input end of the steam turbine 14, an electric line 1124 is connected to the output end of the steam turbine 14, and a third steam flow 2005 is sent to the steam turbine 14 through the sub-pipe 11231 of the second conveying pipe 1123 to generate electricity 2006.

[0090] Figure 4 This is a schematic diagram illustrating an integrated system for cement processing that uses a steam turbine as a power source according to an embodiment of the present invention.

[0091] like Figure 4 As shown, and in combination Figure 1 The steam turbine 14 converts thermal energy into electrical energy using high-temperature steam. A third steam stream 2005 with a higher temperature is sent to the input end of the steam turbine 14 via a sub-pipe 11231 of the second delivery pipe 1123. The steam turbine 14 generates electricity 2006 through a relevant conversion principle and sends the electricity 2006 to SOEC 12 via power line 1124.

[0092] The steam turbine in this embodiment of the invention generates electricity using the heat from the third steam stream, making full use of the high-temperature waste heat in the cement production process.

[0093] According to an exemplary embodiment of the present invention, the power source is a renewable energy power generation device 15.

[0094] Figure 5 This is a schematic diagram illustrating an integrated system for cement processing that uses renewable energy as a power source according to an embodiment of the present invention.

[0095] like Figure 5 As shown, alternatively, renewable energy power generation equipment 15 can be used as the power source to supply SOEC 12.

[0096] Furthermore, according to an exemplary embodiment of the present invention, the renewable energy power generation equipment 15 includes wind power generation equipment and photovoltaic power generation equipment. The present invention is not limited thereto, and other renewable energy equipment may be used as the power source.

[0097] In addition to steam turbines, the power source in embodiments of the present invention can also be renewable energy power generation equipment, thus broadening the application scope of the integrated system of the present invention. The power source selection in embodiments of the present invention includes various types, including environmentally friendly power sources that help reduce carbon dioxide emissions.

[0098] According to an exemplary embodiment of the present invention, an electric heater 16, an air delivery pipe 161 disposed at the input end of the electric heater 16, an electric power line 162, and a third delivery pipe 163 disposed at the output end of the electric heater 16 are provided. The electric heater 16 receives air 1610 from the external environment through the air delivery pipe 161, receives electric power 2006 through the electric power line 162 to heat the air 1610, and sends the heated air 1611 into the anode 122 of the solid oxide electrolytic cell 12 through the third delivery pipe 163.

[0099] Figure 6 This is a schematic diagram illustrating an integrated system for cement processing including an electric heater according to an embodiment of the present invention.

[0100] like Figure 6 As shown, the electric heater 16 receives air 1610 from the external atmosphere via an air supply pipe 161 connected to the input end. There are no specific restrictions on the type of air used; inert gases such as nitrogen can also be used. The electric heater 16 receives power 2006 from the aforementioned power source via an electric power line 162 connected to the input end. This power source can be a steam turbine 14 or a renewable energy power generation device 15. The electric heater 16 heats the air 1610 using an electric heating principle, resulting in heated air 1611 that is delivered to the anode 122 of the SOEC 12 via a third supply pipe 163 connected to the output end.

[0101] In addition, oxygen or an oxygen-air mixture discharged from the anode outlet can be introduced into the burner as a combustion aid to increase the combustion temperature.

[0102] In embodiments of the present invention, the electric heater receives air, heats the air using electricity received from a power source, and then sends the air into the anode of a solid oxide electrolytic cell. By heating the air, the electrolytic cell's temperature is raised; that is, the heated air serves as a heat source, being introduced into the electrolytic cell during the start-up heating phase or when additional heating is needed during operation. This ensures that the electrolytic cell remains within its operating temperature range for electrolytic reactions, thus improving electrolytic efficiency and extending the cell's lifespan.

[0103] According to an exemplary embodiment of the present invention, the device further includes a heat exchanger 17 disposed between the air delivery pipe 161 and the electric heater 16 and connected in series with the electric heater 16, a fourth receiving pipe 171 disposed at the input end of the heat exchanger 17, and a fourth delivery pipe 172 disposed at the output end of the heat exchanger 17. The heat exchanger 17 receives air 1610 from the external environment through the air delivery pipe 161, receives a second gas 2004 with a second temperature through the fourth receiving pipe 171 to heat the air 1610, and sends the heated air 1612 into the electric heater 16 through the fourth delivery pipe 172 for secondary heating.

[0104] Figure 7 This is a schematic diagram illustrating an integrated system for cement processing comprising a heat exchanger and an electric heater connected in series according to an embodiment of the present invention.

[0105] like Figure 7 As shown, the integrated system 1 for cement processing of the present invention places a heat exchanger 17 between an air delivery pipe 161 and an electric heater 16, and connects it in series with the electric heater 16. The heat exchanger 17 allows air 1610 received via the air delivery pipe 161 to exchange heat with a second gas 2004 having a second temperature received via a fourth receiving pipe 171 at the input end. Since the temperature of the second gas 2004 is higher than the temperature of the ambient air, the air 1610 absorbs heat from the second gas 2004 and is thus heated. The heated air 1612 is then sent to the electric heater 16 via the fourth delivery pipe 172 for secondary heating. The execution steps of the electric heater 16 for secondary heating of the air are as follows: Figure 6 The execution steps shown in the previous section are the same and will not be described again here.

[0106] For example, the air 1612 heated by the heat exchanger 17 has a temperature of less than 500°C, and is further heated by the electric heater 16 to raise its temperature to more than 500°C.

[0107] The heat exchanger in this embodiment of the invention uses the high-temperature waste heat generated in the cement production process as a heat source to heat the air. The heated air is then heated a second time by an electric heater, which further increases the temperature of the air. This secondary heating of the air can more effectively ensure that the electrolysis reaction can take place within the operating temperature range, which further helps to improve the electrolysis efficiency of the electrolytic cell and extend the life of the electrolytic cell.

[0108] According to an exemplary embodiment of the present invention, a power conversion and control unit 18 is also included, which converts electrical energy provided by the renewable energy power generation equipment 15 into electrical energy that can be used by the solid oxide electrolyzer 12.

[0109] Figure 8This is a schematic diagram illustrating the control of a solid oxide electrolyzer by a power conversion and control unit according to an embodiment of the present invention.

[0110] like Figure 8 As shown, the power conversion and control unit 18 includes, for example, a transformer, a rectifier, a circuit breaker, etc., and is capable of performing power conversion functions so that the power generated by the steam turbine 14 and the renewable energy power generation equipment 15 can be used in the integrated system 1 for cement processing, specifically, in the form of electric heaters 16, SOEC 12, etc.

[0111] Furthermore, the power conversion and control unit 18 includes, for example, a PLC controller, sensors, actuators, etc., and is capable of performing control functions, such as controlling whether to supply power to the SOEC 12 for the electrolysis reaction. The power conversion and control unit 18 also controls the flow rates of hydrogen and oxygen produced by the electrolysis reaction. For example, when the hydrogen flow rate is less than a certain threshold, the power conversion and control unit 18 can increase the power supplied to the SOEC 12 to increase the hydrogen flow rate.

[0112] The power conversion and control unit of the present invention can perform the required conversion of electrical energy according to the power used by the solid oxide electrolyzer, so that the integrated system of the present invention can be applied to more scenarios.

[0113] The power conversion and control unit of the present invention enables a comprehensive understanding of the state of the solid oxide electrolyzer, allowing operators to respond promptly to various situations.

[0114] According to an embodiment of the present invention, the cement production unit 13 further includes a preheating tower and a cooler, the preheating tower generating a first gas 2001 having a temperature between 300-400°C, and the cooler generating a second gas 2004 having a temperature between 400-500°C.

[0115] In embodiments of the present invention, a technical solution is provided that uses high-temperature waste heat from the cement process to generate steam flow through waste heat recovery and vaporizer, and improves the electrolysis efficiency of the electrolytic cell through the steam flow, thereby further utilizing the electrolysis products to make cement production more energy-saving and carbon-reducing. This solution at least solves the technical problems of low electrolysis efficiency of solid oxide electrolytic cells and unsatisfactory energy-saving and carbon-reducing effects in cement processes in the prior art, and achieves the technical effect of improving the electrolysis efficiency of solid oxide electrolytic cells and further enhancing energy-saving and carbon-reducing effects.

[0116] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0117] In the several embodiments provided by this invention, it should be understood that the disclosed technical content can be implemented in other ways.

[0118] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An integrated system (1) for a cement process, characterized by, The integrated system (1) comprises a waste heat recovery and vaporization unit (11), a solid oxide electrolysis cell (12), wherein, The waste heat recovery and vaporization unit (11) comprises a first waste heat recovery and vaporizer (111), a first receiving pipeline (1111) and a first water inlet pipeline (1112) arranged at a receiving end of the first waste heat recovery and vaporizer (111), a first conveying pipeline (1113) arranged at an output end of the first waste heat recovery and vaporizer (111), a second waste heat recovery and vaporizer (112), a second receiving pipeline (1121) and a second water inlet pipeline (1122) arranged at a receiving end of the second waste heat recovery and vaporizer (112), a second conveying pipeline (1123) arranged at an output end of the second waste heat recovery and vaporizer (112); The first waste heat recovery and vaporizer (111) is configured to receive water (2002) through the first water inlet pipeline (1112), and receive a first gas (2001) generated in the cement process and having a first temperature through the first receiving pipeline (1111), wherein the water absorbs heat of the first gas (2001) in the first waste heat recovery and vaporizer (111) to be vaporized to generate a first steam flow (2003); the first waste heat recovery and vaporizer (111) sends the first steam flow (2003) into the second waste heat recovery and vaporizer (112) through the first conveying pipeline (1113); The second waste heat recovery and vaporizer (112) is configured to receive water (2002) through the second water inlet pipeline (1122), and receive a second gas (2004) generated in the cement process and having a second temperature higher than the first temperature through the second receiving pipeline (1121), wherein the water absorbs heat of the second gas (2004) in the second waste heat recovery and vaporizer (112) to be vaporized to generate a second steam flow; a mixer included in the second waste heat recovery and vaporizer (112) receives the first steam flow (2003) to mix with the second steam flow to generate a third steam flow (2005), and sends the third steam flow (2005) into the solid oxide electrolysis cell (12) through the second conveying pipeline (1123); The solid oxide electrolysis cell (12) receives the third steam flow (2005) and receives electric power (2006) from a power source through an electric power line (1124), and generates hydrogen (1221) and oxygen (1222) through an electrolysis reaction; The integrated system (1) further comprises a cement production unit (13), the cement production unit (13) performs the cement process, and a burner included in the cement production unit (13) receives at least one of the hydrogen (1221), the oxygen (1222), and a combination thereof. The power supply includes a steam turbine (14), a sub-pipe (11231) of the second conveying pipe (1123) is connected to a steam input end of the steam turbine (14), an electric power line (1124) is connected to an electric power output end of the steam turbine (14), and the third steam flow (2005) is sent to the steam turbine (14) through the sub-pipe (11231) of the second conveying pipe (1123) to generate the electric power (2006).

2. The integrated system (1) for the cement process according to claim 1, characterized in that, The third steam flow (2005) is sent to the cathode (121) of the solid oxide electrolysis cell (12) through the second conveying pipe (1123).

3. The integrated system (1) for the cement process according to claim 1, characterized in that, The power supply includes a renewable energy power generation device (15).

4. The integrated system (1) for cement process according to claim 1, characterized in that, Further comprising an electric heater (16), an air conveying pipe (161) arranged at an input end of the electric heater (16), an electric power line (162), and a third conveying pipe (163) arranged at an output end of the electric heater (16), wherein the electric heater (16) receives air (1610) from an external environment through the air conveying pipe (161), the electric heater (16) receives the electric power (2006) from the power supply through the electric power line (162) to heat the air (1610), and the heated air (1611) is sent into the anode (122) of the solid oxide electrolysis cell (12) through the third conveying pipe (163).

5. The integrated system (1) for the cement process according to claim 4, characterized in that, Further comprising a heat exchanger (17) arranged between the air conveying pipe (161) and the electric heater (16) and connected in series with the electric heater (16), a fourth receiving pipe (171) arranged at an input end of the heat exchanger (17), and a fourth conveying pipe (172) arranged at an output end of the heat exchanger (17), wherein the heat exchanger (17) receives air (1610) through the air conveying pipe (161), the heat exchanger (17) receives the second gas (2004) with a second temperature through the fourth receiving pipe (171) to heat the air (1610), and the heated air (1612) is sent into the electric heater (16) for secondary heating through the fourth conveying pipe (172).

6. The integrated system (1) for cement process according to claim 3, characterized in that, The renewable energy power generation device (15) includes a wind power generation device and a photovoltaic power generation device.

7. The integrated system (1) for the cement process according to claim 1 or 3, characterized in that, Further comprising an electric power conversion and control unit (18) that converts electric energy provided by the renewable energy power generation device (15) into electric power that can be used by the solid oxide electrolysis cell (12).

8. The integrated system (1) for cement process according to claim 1, characterized in that, The cement production unit (13) further comprises a preheating tower and a cooler, the preheating tower generates the first gas (2001) with a temperature between 300-400℃, and the cooler generates the second gas (2004) with a temperature between 400-500℃. The power supply includes a steam turbine (14), a sub-pipe (11231) of the second conveying pipe (1123) is connected to a steam input end of the steam turbine (14), an electric power line (1124) is connected to an electric power output end of the steam turbine (14), and the third steam flow (2005) is sent to the steam turbine (14) through the sub-pipe (11231) of the second conveying pipe (1123) to generate the electric power (2006).

Images