Electrolytic flue gas waste heat deep recovery and multi-element utilization system, method and device

Abstract

The invention relates to the related technical field of waste heat recovery, in particular to an electrolytic flue gas waste heat deep recovery and multi-element utilization system, method and device. In the system, an electrolytic flue gas waste heat recovery system is respectively connected with a heat supply system, a domestic hot water preparation system and a waste heat refrigeration system; a waste heat power plant raw water and condensed water heating system transmits waste heat of electrolytic flue gas to the heat supply system, the waste heat refrigeration system, the waste heat power plant raw water and condensed water heating system and a domestic hot water supply system; the heat supply system is used for supplying heat based on the electrolysis flue gas waste heat; the waste heat refrigerating system is used for refrigerating based on electrolysis flue gas waste heat; the waste heat power plant raw water and condensed water heating system is used for heating power plant raw water and condensed water based on electrolysis flue gas waste heat; the hot water supply system is used for heating based on the electrolysis flue gas waste heat to obtain available hot water for bathing and restaurants; the automatic control system is used for controlling the electrolysis flue gas waste heat recovery system, the heat supply system, the hot water supply system, the waste heat refrigeration system and the waste heat power plant raw water and condensed water heating system so as to achieve deep recovery of electrolysis flue gas waste heat.

Description

Technical Field

[0001] This application relates to the technical field of waste heat recovery, and specifically relates to a system, method, and device for deep recovery and multiple utilization of waste heat from electrolytic flue gas. Background Art

[0002] During the production process of electrolytic aluminum, electrolytic flue gas is generated, and the waste heat in the electrolytic flue gas is not effectively utilized, resulting in waste of energy. Summary of the Invention

[0003] In view of this, embodiments of this application are committed to providing a system, method, and device for deep recovery and multiple utilization of waste heat from electrolytic flue gas.

[0004] This application provides a system for deep recovery and multiple utilization of waste heat from electrolytic flue gas, including: an electrolytic flue gas waste heat recovery system, a heating system, a waste heat refrigeration system, a waste heat power plant raw water condensate heating system, an automatic control system, and a hot water supply system;

[0005] The electrolytic flue gas waste heat recovery system is respectively connected to the heating system, the waste heat refrigeration system, and the waste heat power plant raw water condensate heating system, and is used to transfer the waste heat of the electrolytic flue gas to the heating system, the waste heat refrigeration system, the waste heat power plant raw water condensate heating system, and the hot water supply system;

[0006] The heating system is used for heating based on the waste heat of the electrolytic flue gas;

[0007] The waste heat refrigeration system is used for refrigeration based on the waste heat of the electrolytic flue gas;

[0008] The waste heat power plant raw water condensate heating system is used for heating the raw water condensate of the power plant based on the waste heat of the electrolytic flue gas;

[0009] The hot water supply system is used for heating to obtain available hot water based on the waste heat of the electrolytic flue gas;

[0010] The automatic control system is used to control the electrolytic flue gas waste heat recovery system, the heating system, the hot water supply system, the waste heat refrigeration system, and the waste heat power plant raw water condensate heating system to achieve deep recovery of waste heat from electrolytic flue gas.

[0011] In some embodiments, the electrolytic flue gas waste heat recovery system includes measures for heat insulation of the flue gas duct.

[0012] In some embodiments, a control component is provided on the electrolytic flue gas waste heat recovery system; the automatic control system adjusts the transmission of waste heat from the electrolytic flue gas based on the control component. In some embodiments, the control component includes: sensors, valves, and instruments.

[0013] In some embodiments, it further includes: a raw water condensation heating system for power plants,

[0014] The raw water heating system for power plants and the raw water condensation heating system for waste heat power plants are connected in parallel to form a raw water heating system for power plants; the raw water heating system for power plants and the raw water condensation heating system for waste heat power plants are used as backups for each other. The condensate heating system for power plants and the condensate heating system for waste heat power plants are connected in series to form a condensate heating system for power plants; the condensate heating system for power plants and the raw water condensation heating system for waste heat power plants are used as backups for each other.

[0015] In some embodiments, the waste heat refrigeration device includes a lithium bromide unit for refrigeration using waste heat during non-heating seasons.

[0016] In some embodiments, the automatic control system is specifically configured to preferentially transfer the waste heat of electrolytic flue gas to the system with a high priority according to a preset priority;

[0017] Among them, the first priority includes the hot water supply system;

[0018] The second priority includes: the heating system, the waste heat refrigeration system

[0019] The third priority includes: the raw water condensation heating system for waste heat power plants.

[0020] This application also provides a utilization method for the electrolytic flue gas waste heat deep recovery and multi-purpose utilization system as described above, including:

[0021] Obtain the operating status of the electrolytic flue gas waste heat recovery system;

[0022] Based on the hot water supply system, utilize the electrolytic flue gas waste heat to heat and obtain available hot water;

[0023] If there is still electrolytic flue gas waste heat after performing the above steps, during the heating period, according to the operating status of the electrolytic flue gas waste heat recovery system, through the heating system, based on the electrolytic flue gas waste heat, conduct heating, and during the cooling period, according to the operating status of the electrolytic flue gas waste heat recovery system, through the waste heat refrigeration system, use it to refrigerate based on the electrolytic flue gas waste heat;

[0024] If there is still electrolytic flue gas waste heat after performing the above steps, based on the electrolytic flue gas waste heat, conduct heating of the raw water condensate for power plants.

[0025] This application also provides an electronic device, including:

[0026] A processor, and a memory for storing programs executable by the processor;

[0027] The processor is configured to implement the utilization method as described above by running the programs in the memory.

[0028] The present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is run by a processor, the processor is caused to execute the utilization method as described above.

[0029] A system for deep recovery and diversified utilization of waste heat from electrolytic flue gas provided by the present application includes: an electrolytic flue gas waste heat recovery system, a heating system, a waste heat refrigeration system, a waste heat power plant raw water condensate heating system, an automatic control system, and a hot water supply system; the electrolytic flue gas waste heat recovery system is respectively connected to the heating system, the waste heat refrigeration system, and the waste heat power plant raw water condensate heating system, and is used to transfer the waste heat of the electrolytic flue gas to the heating system, the waste heat refrigeration system, the waste heat power plant raw water condensate heating system, and the hot water supply system; the heating system is used for heating based on the waste heat of the electrolytic flue gas; the waste heat refrigeration system is used for refrigeration based on the waste heat of the electrolytic flue gas; the waste heat power plant raw water condensate heating system is used for heating the raw water of the power plant based on the waste heat of the electrolytic flue gas; the hot water supply system is used for heating to obtain available hot water based on the waste heat of the electrolytic flue gas; the automatic control system is used to control the electrolytic flue gas waste heat recovery system, the heating system, the hot water supply system, the waste heat refrigeration system, and the waste heat power plant raw water condensate heating system to achieve deep recovery of the waste heat of the electrolytic flue gas. With such a setting, the waste heat of the flue gas is deeply recovered through the electrolytic flue gas waste heat recovery system and distributed to the heating system, the waste heat refrigeration system, the waste heat power plant raw water condensate heating system, and the hot water supply system. This diversified utilization method ensures the efficient utilization of waste heat in different seasons and under different demands, and avoids the energy waste caused by the traditional single utilization method. The system realizes the intelligent distribution and adjustment of the waste heat of the electrolytic flue gas through the automatic control system, ensures the maximum utilization of the waste heat, reduces the dependence on external energy (such as steam, electricity, etc.), and thus significantly reduces the energy consumption and operating costs of the enterprise. The automatic control system can monitor and adjust the operating status of each subsystem in real time to ensure the stable operation of the system under different working conditions. This intelligent control method not only improves the reliability of the system, but also reduces manual intervention and operation and maintenance costs. The system design takes into account the changes in different seasons and different energy consumption demands. Through the flexible adjustment of the automatic control system, it can adapt to various working conditions, ensure the efficient utilization of waste heat, and meet the diversified energy consumption demands of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other objects, features, and advantages of the present application will become more apparent by describing the embodiments of the present application in more detail with reference to the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0031] Figure 1 It is a schematic structural diagram of a deep recovery and multi - utilization system for electrolytic flue gas waste heat provided by an embodiment of the present application.

[0032] Figure 2 It is a schematic scenario diagram of a deep recovery and multi - utilization system for electrolytic flue gas waste heat provided by an embodiment of the present application.

[0033] Figure 3 It is a schematic flow diagram of a utilization method provided by an embodiment of the present application.

[0034] Figure 4 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Detailed Embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Application Overview

[0037] In view of the contradictory situations that occur in the traditional utilization of electrolytic flue gas waste heat, such as the low flue gas temperature caused by the low ambient temperature in the heating season and the large heat demand, the high flue gas temperature in the non - heating season with little use, and the influence of the day - night temperature difference on heat users, the present application proposes to insulate the electrolytic flue to make the annual flue gas temperature basically stable and the day - night flue gas temperature stable.

[0038] After thermal insulation on the heat source side in the utilization of waste heat from electrolytic flue gas, the amount of recoverable waste heat is large, which can be easily consumed during the heating season, but it is difficult to consume during the non-heating season. There is a need for continuous and stable consumers. The recovered waste heat is used to supply heat to the waste heat refrigeration lithium bromide unit during the non-heating season, and the produced chilled water is adjusted through the heating pipe network and valve group and supplied to cold-using points such as the distribution room, high-voltage variable frequency room, production process, and agricultural greenhouses to meet safe production, and supply cooling to the office and living areas in summer. This demand has a relatively large correlation between heat demand and environmental temperature. The surplus heat needs to be sent to the raw water and condensate heating system of the power plant, and the heat demand of this system is much greater than the heat collection capacity of the heat source side. By adjusting the steam supply volume of the power plant heating system, the stability of the process temperature of the power plant water system is adjusted.

[0039] The solution provided in this application adopts an integrated method to solve the problems of insufficient heat source recovery, insufficient consumption and utilization after recovery, and inability to annualize energy-saving benefits in the prior art.

[0040] After introducing the basic principle of this application, various non-limiting embodiments of this application will be specifically introduced with reference to the accompanying drawings.

[0041] Exemplary System

[0042] Refer to Figure 1 、 Figure 2 As shown in FIGS.

[0043] The electrolytic flue gas waste heat recovery system is respectively connected to the heating system, the waste heat refrigeration system, and the waste heat power plant raw water and condensate heating system, and is used to transmit the electrolytic flue gas of the electrolytic flue gas waste heat recovery system to the heating system, the waste heat refrigeration system, the waste heat power plant raw water and condensate heating system, and the hot water supply system;

[0044] The electrolytic flue gas waste heat recovery system is respectively connected to the heating system, the waste heat refrigeration system, and the waste heat power plant raw water and condensate heating system, and is used to transmit the waste heat of the electrolytic flue gas to the heating system, the waste heat refrigeration system, the waste heat power plant raw water and condensate heating system, and the hot water supply system;

[0045] The heating system is used for heating based on the electrolytic flue gas waste heat;

[0046] The waste heat refrigeration system is used for refrigeration based on the electrolytic flue gas waste heat;

[0047] The waste heat power plant raw water and condensate heating system is used for heating the raw water and condensate of the power plant based on the electrolytic flue gas waste heat;

[0048] The hot water supply system is used to heat the electrolytic flue gas waste heat to obtain available hot water.

[0049] The automatic control system is used to control the electrolytic flue gas waste heat recovery system, the heating system, the hot water supply system, the waste heat refrigeration system, and the raw water condensate heating system of the waste heat power plant, so as to achieve in-depth recovery of electrolytic flue gas waste heat.

[0050] In the solution provided by this application, the electrolytic flue gas waste heat recovery system is the core part of the whole system, responsible for transferring the electrolytic flue gas waste heat to other subsystems for waste heat recovery and utilization. The electrolytic flue gas waste heat recovery system is respectively connected to the heating system, the waste heat refrigeration system, the raw water condensate heating system of the waste heat power plant, and the hot water supply system. Further, the flue gas duct in the electrolytic flue gas waste heat recovery system adopts heat insulation measures to reduce heat loss during transmission and ensure the stability of the flue gas temperature. The flow direction of the flue gas is controlled by valves and instruments to achieve flexible switching between different subsystems.

[0051] The hot water supply system uses the electrolytic flue gas waste heat to heat domestic hot water. It is connected to the electrolytic flue gas waste heat recovery system, receives the electrolytic flue gas waste heat, and uses its heat for hot water heating. The hot water supply system transfers the heat of the flue gas to domestic water through a heat exchange device to meet the hot water demands such as bathing and production processes. The system is equipped with a hot water storage tank to ensure the stability and flexibility of hot water supply.

[0052] It should be noted that in practical applications, the electrolytic flue gas waste heat supply to the hot water supply system should be given priority.

[0053] The heating system uses the electrolytic flue gas waste heat for heating. It is connected to the electrolytic flue gas waste heat recovery system, receives the electrolytic flue gas waste heat, and uses its heat for heating. During the heating season, the heating system transfers the heat of the flue gas to the circulating water in the heating pipe network through a heat exchange device to provide heating for living and office areas, distribution rooms, etc. The heating pipe network has a wide coverage area to ensure that heat can be efficiently transported to each heat-using area.

[0054] The waste heat refrigeration system uses the electrolytic flue gas waste heat for refrigeration. It is connected to the electrolytic flue gas waste heat recovery system, receives the electrolytic flue gas waste heat, and uses its heat to drive refrigeration equipment. During the non-heating season, the waste heat refrigeration system converts the heat of the flue gas into cooling capacity through a lithium bromide unit to meet the cooling demands of areas such as distribution rooms, high-voltage variable frequency rooms, production processes, and agricultural greenhouses. The chilled water is transported to the cooling points through the transformed heating pipe network and valve group to ensure safe production and a comfortable environment.

[0055] The raw water and condensate heating system of the waste heat power plant utilizes the waste heat of electrolytic flue gas to heat the raw water and condensate of the power plant. It is connected to the electrolytic flue gas waste heat recovery system, receives the waste heat of electrolytic flue gas and uses its heat for heating raw water and condensate. It is connected in parallel with the traditional power plant raw water heating system and in series with the traditional power plant condensate heating system, serving as backup for each other to ensure the stability of raw water and condensate heating. By adjusting the steam supply, the process temperature of the power plant water system is controlled to avoid temperature fluctuations caused by insufficient or excessive waste heat.

[0056] The automatic control system realizes the automatic control and adjustment of the whole system. The automatic control system is connected to the electrolytic flue gas waste heat recovery system, heating system, waste heat refrigeration system, and raw water and condensate heating system of the waste heat power plant through sensors, valves and instruments. Based on the data collected by sensors and instruments, the automatic control system monitors parameters such as flue gas temperature, pressure and flow rate in real time. By adjusting the valve opening and equipment operation status through the logic control unit (PLC or DCS), the waste heat distribution is optimized to ensure the efficient operation of the system. Manual intervention is reduced, operation and maintenance costs are lowered, and the reliability and stability of the system are improved.

[0057] In the solution provided by this application, the waste heat of electrolytic flue gas is transmitted to each subsystem through the electrolytic flue gas waste heat recovery system. During the heating season, the flue gas heat is preferentially used for heating by the heating system. During the non-heating season, the flue gas heat is used for refrigeration by the waste heat refrigeration system to meet the cooling demand. The surplus heat is used for heating the raw water and condensate of the power plant through the raw water and condensate heating system of the waste heat power plant; and / or hot water available is obtained by heating based on the waste heat of the electrolytic flue gas; the automatic control system adjusts the flue gas flow direction and the operation status of each subsystem according to real-time data to ensure the maximization of waste heat utilization efficiency.

[0058] This system transmits the waste heat to multiple subsystems such as heating, refrigeration, raw water and condensate heating of the power plant, and hot water supply through the electrolytic flue gas waste heat recovery system, and realizes the deep recovery and diversified utilization of waste heat in combination with the automatic control system. This design not only improves the waste heat utilization rate, but also reduces the enterprise's energy cost, with remarkable energy-saving and economic benefits.

[0059] Specifically, the electrolytic flue gas waste heat recovery system includes a heat insulation measure for the flue gas and air pipeline, which is used to insulate the electrolytic flue gas waste heat recovery system. The heat insulation measure for the flue gas and air pipeline uses high-efficiency heat insulation materials, such as rock wool, glass wool or ceramic fiber, etc. These materials have good heat insulation performance and can effectively reduce the heat loss during transmission. The heat insulation material is usually wrapped on the outer wall of the flue gas and air pipeline and fixed by materials such as metal shell or glass cloth to ensure the stability and durability of the insulation layer. The joints and interfaces of the heat insulation measure adopt a sealed design to prevent heat from escaping through the gaps and at the same time avoid the entry of external air into the pipeline, which affects the flue gas temperature. The heat insulation measure reduces the heat loss of the flue gas during transmission through the low thermal conductivity of the heat insulation material, ensuring that the flue gas temperature can still meet the requirements of waste heat utilization when reaching each subsystem. The heat insulation measure helps to maintain the stability of the flue gas temperature, reduces the flue gas temperature fluctuation caused by the day-night temperature difference or seasonal changes, thereby improving the efficiency and reliability of waste heat utilization. By reducing heat loss, the heat insulation measure ensures that more waste heat can be effectively utilized, improving the energy-saving effect of the entire system. The heat insulation measure reduces the additional energy consumption caused by heat loss and lowers the operating cost of the system. The heat insulation measure reduces the thermal expansion and contraction of the pipeline caused by temperature changes, thereby extending the service life of the pipeline and related equipment. The use of the heat insulation measure significantly reduces heat loss, improves the waste heat recovery efficiency, and reduces the energy consumption of the enterprise. By reducing heat dissipation, the heat insulation measure indirectly reduces the carbon emissions caused by energy consumption, meeting the environmental protection requirements.

[0060] The heat insulation measure for the flue gas and air pipeline is an important part of the electrolytic flue gas waste heat recovery system. Through high-efficiency heat insulation materials and sealed design, it reduces the heat loss during transmission, ensures the stability of the flue gas temperature, and improves the waste heat recovery efficiency and the overall performance of the system. This equipment has significant advantages in energy conservation, consumption reduction, environmental protection and economic benefits.

[0061] In some embodiments, the automatic control system includes: a plurality of valves and a plurality of instruments provided on the electrolytic flue gas waste heat recovery system; the automatic control system controls the transmission path of the electrolytic flue gas based on the valves. The automatic control system includes: sensors provided on the electrolytic flue gas waste heat recovery system.

[0062] The following is a detailed description of the automatic control system:

[0063] The automatic control system is the core part of the entire electrolytic flue gas waste heat recovery system, responsible for real-time monitoring and adjusting parameters such as the transmission path, temperature, and pressure of the flue gas to ensure the efficient operation of the system.

[0064] Specifically, a control component is provided on the electrolytic flue gas waste heat recovery system. The automatic control system adjusts the transmission of the electrolytic flue gas waste heat based on the control component to ensure the efficient and stable operation of the system.

[0065] Function of the control component: The control component is the interface between the automatic control system and the electrolytic flue gas waste heat recovery system, and is used to achieve precise control of the waste heat transmission. It can adjust the distribution and utilization of the waste heat in real time according to the actual operating conditions of the system and the preset control logic, ensuring the stability and efficiency of the system under different working conditions.

[0066] Function of the automatic control system: The automatic control system generates corresponding control instructions by monitoring and analyzing data from the control component, such as temperature, pressure, flow rate, etc. These instructions are executed through the control component, such as adjusting the valve opening and controlling the operation of the pump, so as to achieve dynamic adjustment of the electrolytic flue gas waste heat transmission.

[0067] Synergistic effect: The synergistic effect between the control component and the automatic control system enables the system to flexibly adjust the distribution of the waste heat according to actual needs. For example, during the heating season, the waste heat supply to the heating system is increased, and during the non-heating season, more waste heat is distributed to the waste heat refrigeration system and the raw water heating system of the power plant. This dynamic adjustment mechanism not only improves the utilization efficiency of the waste heat, but also ensures the stability and reliability of the system.

[0068] Specifically, the control component includes sensors, valves and instruments.

[0069] Sensors: Sensors are an important part of the control component and are used to monitor key parameters in the system in real time, such as temperature, pressure, flow rate, etc. These data are transmitted to the automatic control system as the basis for control decisions.

[0070] Valves: Valves are used to adjust and control the distribution of electrolytic flue gas waste heat between different systems. Through the instructions of the automatic control system, the valves can accurately adjust the opening degree to ensure that the waste heat is distributed according to the preset ratio and demand.

[0071] Instruments: Instruments are used to display and record the operating parameters in the system, such as temperature, pressure, flow rate, etc. These data not only provide intuitive system operating status information for operators, but also support the data analysis and decision-making of the automatic control system.

[0072] Through the collaborative work of these control components, the automatic control system can achieve precise adjustment of the electrolytic flue gas waste heat transmission, ensuring the efficient and stable operation of the system. This design not only improves the intelligent level of the system, but also reduces the need for manual intervention and the operation and maintenance costs.

[0073] In practical applications, valves are used to control the transmission path of flue gas, ensuring that the waste heat can be distributed to different subsystems as needed (such as heating systems, waste heat refrigeration systems, raw water in power plants, condensate heating systems, etc.). The opening and closing and the opening degree of the valves are controlled by electric actuators, which are suitable for remote control. The valves are actuated by air pressure, which is suitable for occasions that require quick response. The opening and closing and the opening degree of the valves are adjusted by the automatic control system according to the data collected by the sensors. For example, when the demand of the heating system increases, the automatic control system will open or increase the opening degree of the valve leading to the heating system to increase the waste heat flow rate. Instruments are used to monitor in real time parameters such as the temperature, pressure, and flow rate of the flue gas, providing data support for the automatic control system. For example, thermocouples and thermal resistors are used to measure the temperature of the flue gas. For example, pressure transmitters are used to measure the pressure of the flue gas. For example, flow meters are used to measure the flow rate of the flue gas. The data collected by the instruments are transmitted to the control unit of the automatic control system (such as PLC or DCS) through wired or wireless means. Sensors collect in real time parameters such as the temperature and pressure of the flue gas, providing accurate real-time data for the automatic control system. Temperature sensors: used to monitor the temperature of the flue gas to ensure that the flue gas temperature is within a reasonable range. Pressure sensors: used to monitor the pressure of the flue gas to avoid the system operation being affected by too high or too low pressure. Flow sensors: used to monitor the flow rate of the flue gas to ensure reasonable flue gas distribution. Data processing: The data collected by the sensors are processed through filtering, amplification, etc. and then transmitted to the control unit of the automatic control system. Real-time monitoring: Through the sensors and instruments, parameters such as the temperature, pressure, and flow rate of the flue gas are monitored in real time. Automatic regulation: According to the monitored data, the automatic control system adjusts the opening degree of the valves through the logic control unit (such as PLC or DCS) to optimize the flue gas distribution. Fault alarm: When the monitored data exceeds the set range, the automatic control system will send out an alarm signal to remind the operation and maintenance personnel to handle it in time; Remote monitoring: Remote monitoring and operation are supported, and the operation and maintenance personnel can view the system status in real time through the monitoring platform and perform remote regulation.

[0074] The automatic control system can monitor and regulate the flue gas distribution in real time, ensuring the maximization of waste heat utilization efficiency. Through the accurate monitoring of the sensors and instruments, the automatic control system can detect and handle abnormal situations in time, improving the stability of the system. By optimizing the flue gas distribution, unnecessary heat loss is reduced, and energy consumption is lowered. Remote monitoring and operation are supported, reducing manual intervention and improving the intelligent level of the system.

[0075] The automatic control system realizes the real-time monitoring and automatic regulation of the electrolytic flue gas waste heat recovery system through the coordinated work of multiple valves, instruments, and sensors. This design not only improves the operation efficiency and stability of the system, but also reduces the operation and maintenance costs, bringing significant energy-saving and economic benefits to the enterprise.

[0076] In some embodiments, it further includes: a raw water and condensate heating system for power plants. The raw water heating system for power plants and the raw water and condensate heating system of the waste heat power plant are connected in parallel to form a raw water heater for power plants; the condensate heating system for power plants and the raw water and condensate heating system of the waste heat power plant are connected in series to form a condensate heater for power plants; the raw water and condensate heating system for power plants and the raw water and condensate heating system of the waste heat power plant are used as backups for each other.

[0077] In some embodiments, the system further includes a raw water and condensate heating system for power plants. This system is connected in parallel and in series with the raw water and condensate heating system of the waste heat power plant respectively to form a raw water and condensate heater for power plants, and the two are used as backups for each other. The following is a detailed description:

[0078] Raw water and condensate heating system for power plants: The traditional raw water and condensate heating system usually uses steam or other heat sources for heating.

[0079] Raw water and condensate heating system of the waste heat power plant: A system that uses the waste heat of electrolytic flue gas to heat raw water and condensate.

[0080] The raw water and condensate heating system for power plants and the raw water and condensate heating system of the waste heat power plant are connected in parallel and in series respectively to jointly form a raw water and condensate heater for power plants. The two systems are used as backups for each other. When one of the systems fails or cannot meet the heating demand, the other system can immediately take over to ensure the continuity of raw water and condensate heating.

[0081] When there is sufficient waste heat in the electrolytic flue gas, the raw water and condensate heating system of the waste heat power plant serves as the main heating source, using the waste heat of the electrolytic flue gas to heat raw water and condensate. The raw water and condensate heating system for power plants is used as a backup and is ready to be put into operation at any time when needed. When the waste heat in the electrolytic flue gas is insufficient or the raw water and condensate heating system of the waste heat power plant fails, the automatic control system will switch to the raw water and condensate heating system for power plants and continue to heat raw water and condensate using traditional heat sources (such as steam) to ensure the stability of the raw water and condensate temperature.

[0082] The automatic control system monitors the operating states of the two systems in real time through sensors and instruments, including parameters such as temperature and pressure. When it is detected that the raw water and condensate heating systems of the waste heat power plant cannot meet the requirements or malfunction, the automatic control system will quickly adjust the valves and switch to the raw water and condensate heating systems of the power plant to ensure the continuity of raw water and condensate heating. The automatic control system optimizes the operation of the two systems based on real-time data to ensure finding the best balance between energy conservation and stability. Through the design of mutual backup, the reliability of raw water and condensate heating is ensured, avoiding production interruption caused by the failure of a single system. The waste heat of electrolytic flue gas is preferentially utilized for raw water and condensate heating, reducing the use of traditional heat sources and lowering energy consumption. The system can flexibly switch according to the availability and demand of waste heat to adapt to different working conditions. Through the precise regulation of the automatic control system, the stability of the raw water and condensate temperature is ensured to meet the requirements of the production process.

[0083] The parallel and series designs of the raw water and condensate heating systems of the power plant and the raw water and condensate heating systems of the waste heat power plant, combined with the real-time monitoring and automatic switching functions of the automatic control system, ensure the efficient, stable and reliable operation of raw water and condensate heating. This design not only improves the energy-saving effect of the system, but also enhances the flexibility and adaptability of the system, bringing significant economic and environmental benefits to the enterprise. The waste heat refrigeration device includes a lithium bromide unit for refrigeration using waste heat in the non-heating season.

[0084] In summary, in the solution provided by this application, based on the original waste heat utilization, the heat preservation of the purification area is increased, combined with the power plant heating system, the waste heat refrigeration system, or the power plant heating system + waste heat refrigeration system, supplemented by the automated operating system of our company, with automatic adjustment, without adding additional operation and maintenance personnel, and the method is simple and easy to implement. Compared with the previous traditional electrolytic flue gas waste heat utilization, the added part has a simple logic and is technically mature and stable, which can save winter heating costs, summer refrigeration costs, raw water and condensate heating steam costs of the power plant, low temperature rise steam consumption costs, and the corresponding carbon emission reduction costs, and can improve the competitiveness of the enterprise. This method has strong practicality, can be fully automated, and is simple and easy to implement compared with traditional waste heat projects.

[0085] In the solution provided by this application, on the basis of the previous system for recovering electrolytic flue gas waste heat for heating and bathing, the energy utilization efficiency method in the non-heating season is added. The electrolytic flue gas pipeline is heat-insulated to maximize the recovered waste heat. Specifically, the flue gas pipeline in front of the installation position of the electrolytic purification heat exchange device is heat-insulated. The raw water heater of the power plant is connected in parallel with the waste heat raw water heater, and the two systems are mutually backup. The last-stage low-pressure heater of the power plant is connected in series with the waste heat heater, and the two heating systems are mutually backup. The electrolytic aluminum waste heat is led to the power plant through pipeline laying. According to the cooling demand, a waste heat refrigeration device is configured, and the heating pipe network and valve group are transformed. Then, the above equipment is reasonably configured with valves, instruments, and automatic control.

[0086] In some embodiments, the automatic control system is specifically configured to preferentially transfer the waste heat of electrolytic flue gas to systems with high priorities according to a preset priority; wherein, the first priority includes a hot water supply system; the second priority includes: a heating system, a waste heat refrigeration system; the third priority includes: a raw water and condensate heating system for a waste heat power plant.

[0087] The setting of the priority is based on the functional importance of each system, the urgency of energy demand, and the stability requirements of system operation. By preferentially meeting the needs of high-priority systems, it ensures the normal operation of key functions, while optimizing the distribution of waste heat and improving the energy utilization efficiency of the overall system. The automatic control system dynamically adjusts the distribution of waste heat among different systems according to the preset priority logic. This mechanism ensures that under limited waste heat supply, the needs of high-priority systems are preferentially met, thereby improving the overall operation efficiency and stability of the system.

[0088] The specific priority distribution is as follows:

[0089] First priority: Hot water supply system: The hot water supply system is an important part of meeting basic living needs, and its stable operation is crucial for users' daily life. Therefore, the automatic control system preferentially ensures the waste heat supply of the hot water supply system to ensure that users can obtain the required hot water at any time.

[0090] Second priority: Heating system, waste heat refrigeration system: The heating system provides a comfortable living and working environment for users during the heating season, while the waste heat refrigeration system provides necessary cooling for key equipment such as the distribution room and high-voltage variable frequency room during the non-heating season to ensure the stable operation of the equipment. These two systems have a relatively large demand for waste heat and are closely related to users' comfort and the operation safety of equipment. Therefore, they are set as the second priority.

[0091] Third priority: Raw water and condensate heating system for a waste heat power plant: The raw water and condensate heating system for a waste heat power plant is mainly used to improve the energy utilization efficiency of the power plant. Its demand is relatively flexible, and its dependence on the temperature and supply volume of waste heat is relatively low. Therefore, after meeting the needs of the systems with the first two priorities, the remaining waste heat will be allocated to this system for further optimizing the energy efficiency of the power plant.

[0092] Through this priority distribution mechanism, the system can flexibly adjust the distribution of waste heat according to actual needs, ensure the normal operation of key functions, and at the same time improve the utilization efficiency of waste heat. This design not only improves the intelligent level of the system, but also reduces the need for manual intervention, reduces the operation and maintenance costs, and ensures the stability and reliability of the system.

[0093] The method embodiments of this application can be applied to the system embodiments of this application. For details not disclosed in the method embodiments of this application, please refer to the system embodiments of this application.

[0094] Figure 3 The following is a flowchart of a method provided by an embodiment of this application. As Figure 3 shown, the method includes:

[0095] Step 301, obtain the operating status of the electrolytic flue gas waste heat recovery system;

[0096] Specifically, sensors are deployed at key positions in the electrolytic flue gas waste heat recovery system, including temperature sensors, pressure sensors, flow sensors, etc., for real-time monitoring of parameters such as the temperature, pressure, and flow rate of the flue gas. Through a wired or wireless communication network, the data collected by these sensors is transmitted to the automatic control system.

[0097] The automatic control system cleans and analyzes the collected data, removes outliers and noise, and ensures the accuracy and reliability of the data. According to the data analysis results, the operating status of the system is evaluated, including the available amount of waste heat, the temperature and pressure of the waste heat, etc.

[0098] The system evaluates the current operating status of the system according to the preset operating parameters and thresholds, and determines whether the waste heat is sufficient for subsequent utilization steps. If the waste heat is insufficient, the system will issue an alarm or adjust the operating mode to ensure the stable operation of the system.

[0099] Step 302, based on the hot water supply system, utilize the electrolytic flue gas waste heat to heat and obtain available hot water;

[0100] Specifically, the electrolytic flue gas waste heat transfers heat to the cold water through a heat exchanger, heating the cold water into hot water. The design of the heat exchanger ensures efficient heat transfer while avoiding direct contact between the flue gas and water, ensuring the safety of the water quality.

[0101] The heated hot water is stored in a hot water storage tank for subsequent use. According to the needs of users, the hot water is distributed to each water use point through a pipeline system, such as dormitories, bathrooms, restaurants, etc.

[0102] The automatic control system dynamically adjusts the operating power of the heat exchanger according to the demand for hot water and the supply of waste heat to ensure a stable supply of hot water. If the waste heat is insufficient, the system will give priority to meeting the demand of the hot water supply system to ensure that the basic living needs of users are not affected.

[0103] Step 303: If there is still waste heat in the electrolytic flue gas after performing the above steps, during the heating period, according to the operating status of the electrolytic flue gas waste heat recovery system, through the heating system, based on the electrolytic flue gas waste heat, heating is carried out; during the cooling period, according to the operating status of the electrolytic flue gas waste heat recovery system, through the waste heat refrigeration system, it is used to cool based on the electrolytic flue gas waste heat;

[0104] Waste heat utilization during the heating period: During the heating season, the automatic control system distributes the remaining electrolytic flue gas waste heat to the heating system. The waste heat is transferred to the heating medium (such as hot water) through a heat exchanger, which is used to provide heating for the office area, living area, etc. The system dynamically adjusts the heating intensity according to the indoor and outdoor temperatures and user needs to ensure the heating effect.

[0105] Waste heat utilization during the cooling period: During the non-heating season, the automatic control system distributes the remaining electrolytic flue gas waste heat to the waste heat refrigeration system. The waste heat refrigeration system (such as a lithium bromide unit) uses the waste heat for refrigeration, and the chilled water produced is regulated through the heating pipe network and valve group and supplied to the cold points such as the power distribution room, high-voltage frequency conversion room, and production process use, meeting the cooling needs of safe production and the office and living areas. The system dynamically adjusts the refrigeration intensity according to the ambient temperature and cooling demand to ensure the refrigeration effect.

[0106] Step 304: If there is still electrolytic flue gas waste heat after performing the above steps, based on the electrolytic flue gas waste heat, heating of the raw water and condensate water in the power plant is carried out.

[0107] After meeting the requirements of the hot water supply system, heating system, and waste heat refrigeration system, the remaining electrolytic flue gas waste heat is distributed to the raw water and condensate water heating system in the power plant. The waste heat is transferred to the raw water and condensate water of the power plant through a heat exchanger, increasing the temperature of the raw water and condensate water and reducing the power plant's dependence on steam during the heating process of the raw water and condensate water.

[0108] The automatic control system dynamically adjusts the operating power of the heat exchanger according to the temperature requirements of the raw water and condensate water in the power plant and the supply of waste heat to ensure the efficiency and stability of the raw water and condensate water heating. If the waste heat is insufficient, the system will adjust the steam supply of the power plant heating system to ensure the stability of the raw water and condensate water temperature.

[0109] By using the electrolytic flue gas waste heat for raw water and condensate water heating, the steam consumption of the power plant during the raw water and condensate water heating process is reduced, and the overall energy utilization efficiency of the power plant is improved. This optimization not only reduces the operating cost of the power plant but also reduces the pollutant emissions generated by burning fossil fuels, with significant environmental benefits.

[0110] Through the above steps, the electrolytic flue gas waste heat has been deeply recovered and utilized in multiple ways, ensuring the efficient and stable operation of the system, while achieving the maximization of energy conservation, consumption reduction, and environmental benefits.

[0111] In some embodiments, if the automatic control system includes: a plurality of valves and a plurality of instruments provided on the electrolytic flue gas waste heat recovery system, and sensors provided on the electrolytic flue gas waste heat recovery system;

[0112] The utilization method further includes: determining and adjusting the operating state of the electrolytic flue gas waste heat deep recovery and multi - utilization system based on the data collected by the sensors and instruments.

[0113] Specifically, a variety of sensors and instruments are installed in the system to collect parameters such as the temperature, pressure, and flow rate of the electrolytic flue gas in real - time, as well as the operating states of each subsystem. The collected data is transmitted to the control unit (such as PLC or DCS) of the automatic control system by wired or wireless means.

[0114] Data processing and analysis: The automatic control system monitors the collected data in real - time to determine whether the operating state of the system is normal. Through data analysis algorithms, the automatic control system processes the collected data and extracts key information, such as the change trend of flue gas temperature, waste heat utilization efficiency, etc.

[0115] System regulation: According to the data analysis results, the automatic control system optimizes the distribution of flue gas by adjusting the opening degree of the valves to ensure that the waste heat can be efficiently utilized. The automatic control system controls the operating states of relevant equipment as needed, such as starting or stopping the lithium bromide unit, adjusting the flow rate of the circulating water pump, etc. The automatic control system optimizes the operating parameters of the system according to real - time data, such as adjusting the temperature set value of the heating system, optimizing the cooling capacity of the refrigeration system, etc. The system adopts closed - loop control and continuously adjusts the operating state through a feedback mechanism to ensure the stability and efficiency of the system.

[0116] When abnormal situations (such as too high temperature, abnormal pressure, etc.) are detected, the automatic control system will send out an alarm signal and take corresponding measures (such as closing the valves, stopping the equipment operation, etc.) to protect the system.

[0117] Specific application scenarios:

[0118] Heating regulation: During the heating season, the automatic control system adjusts the opening degree of the valves leading to the heating system according to the flue gas temperature and heating demand to ensure the heating effect.

[0119] Cooling regulation: During the non - heating season, the automatic control system adjusts the opening degree of the valves leading to the waste heat refrigeration system according to the cooling demand and flue gas temperature to optimize the cooling effect.

[0120] Raw water and condensate heating regulation: The automatic control system adjusts the opening degree of the valves leading to the raw water and condensate heating system of the power plant according to the raw water and condensate temperature and waste heat supply situation to ensure the stability of raw water and condensate heating.

[0121] Hot water supply regulation: The automatic control system adjusts the valve opening degree leading to the hot water supply system according to the hot water demand and the waste heat supply situation, optimizing the hot water supply.

[0122] In the solution provided by this application, through real-time data adjustment, it ensures the maximization of waste heat utilization efficiency and reduces energy waste; the closed-loop control and feedback mechanism ensure the stable operation of the system and avoid system failures caused by parameter fluctuations; the automatic adjustment function reduces manual intervention and improves the intelligent level of the system; the system can flexibly adjust according to real-time data to adapt to different working conditions and demand changes.

[0123] Based on the data collected by sensors and instruments, the automatic control system can monitor and adjust the operating state of the electrolytic flue gas waste heat deep recovery and multi - utilization system in real time. This design not only improves the energy - saving effect and operating stability of the system, but also enhances the intelligence and adaptability of the system, bringing significant economic and environmental benefits to the enterprise.

[0124] Exemplary Electronic Device

[0125] Next, refer to Figure 4 to describe the electronic device according to the embodiment of the present application. Figure 4 The block diagram of the electronic device according to the embodiment of the present application is illustrated.

[0126] As Figure 4 shown, the electronic device 400 includes one or more processors 410 and a memory 420.

[0127] The processor 410 can be a central processing unit (CPU) or other forms of processing units with data - processing capabilities and / or instruction - execution capabilities, and can control other components in the electronic device 400 to perform desired functions.

[0128] The memory 420 can include one or more computer program products, and the computer program products can include various forms of computer - readable storage media, such as volatile memory and / or non - volatile memory. The volatile memory can include, for example, random access memory (RAM) and / or cache memory, etc. The non - volatile memory can include, for example, read - only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions can be stored on the computer - readable storage media, and the processor 410 can run the program instructions to implement the electrolytic flue gas waste heat deep recovery and multi - utilization methods of various embodiments of the present application described above and / or other desired functions. Various contents such as category correspondence relationships can also be stored in the computer - readable storage media.

[0129] In one example, the electronic device 400 may further include: an input device 430 and an output device 440, and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0130] In addition, the input device 430 may further include, for example, a keyboard, a mouse, an interface, and so on. The output device 440 may output various types of information to the outside, including analysis results and the like. The output device 440 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, and so on.

[0131] Of course, for the sake of simplicity, Figure 4 only some of the components related to the present application in the electronic device are shown, and components such as a bus, an input / output interface, and so on are omitted. In addition to this, according to the specific application scenario, the electronic device may further include any other appropriate components.

[0132] Exemplary Computer Program Product and Computer Readable Storage Medium

[0133] In addition to the above methods and devices, an embodiment of the present application may also be a computer program product, which includes computer program instructions that, when run by a processor, cause the processor to execute the steps in the method for deep recovery and multiple utilization of waste heat from electrolytic flue gas according to various embodiments of the present application described in the "Exemplary Method" section of this specification.

[0134] The computer program product may be written in any combination of one or more programming languages to write program code for performing the operations of the embodiments of the present application. The programming languages include object-oriented programming languages, such as Java, C++, etc., and also include conventional procedural programming languages, such as the "C" language or similar programming languages. The program code may be executed entirely on the user's computing device, partially on the user's device, executed as an independent software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0135] In addition, an embodiment of the present application may also be a computer-readable storage medium, on which computer program instructions are stored, and when the computer program instructions are run by a processor, the processor is caused to execute the steps in the method for deep recovery and multiple utilization of waste heat from electrolytic flue gas according to various embodiments of the present application described in the "Exemplary Method" section of this specification.

[0136] The computer-readable storage medium may adopt any combination of one or more readable media. The readable media may be a readable signal medium or a readable storage medium. The readable storage medium may include, for example, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0137] The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the form disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize some of their variations, modifications, alterations, additions, and sub-combinations.

Claims

1. An electrolytic flue gas waste heat deep recovery and multi - utilization system, characterized in that Including: An electrolytic flue gas waste heat recovery system, a heating system, a waste heat refrigeration system, a raw water condensate heating system for a waste heat power plant, an automatic control system, and a hot water supply system; The electrolytic flue gas waste heat recovery system is respectively connected to the heating system, the waste heat refrigeration system, the raw water condensate heating system for the waste heat power plant, and the hot water supply system, and is used to transfer the waste heat of the electrolytic flue gas to the heating system, the waste heat refrigeration system, the raw water condensate heating system for the waste heat power plant, and the hot water supply system; The heating system is used for heating based on the waste heat of the electrolytic flue gas; The waste heat refrigeration system is used for refrigeration based on the waste heat of the electrolytic flue gas; The raw water condensate heating system for the waste heat power plant is used for heating the raw water condensate of the power plant based on the waste heat of the electrolytic flue gas; The hot water supply system is used for heating to obtain available bath hot water and restaurant hot water based on the waste heat of the electrolytic flue gas; The automatic control system is used to control the electrolytic flue gas waste heat recovery system, the heating system, the hot water supply system, the waste heat refrigeration system, and the raw water condensate heating system for the waste heat power plant to achieve deep recovery of the waste heat of the electrolytic flue gas.

2. The deep recovery and multi - utilization system for waste heat of electrolytic flue gas according to claim 1, wherein, The electrolytic flue gas waste heat recovery system includes heat insulation measures for the flue gas duct.

3. The deep recovery and multi - utilization system for waste heat of electrolytic flue gas according to claim 2, characterized in that, A control component is provided on the electrolytic flue gas waste heat recovery system; The automatic control system adjusts the transmission of the waste heat of the electrolytic flue gas based on the control component.

4. The electrolytic flue gas waste heat deep recovery and multi - utilization system according to claim 3, characterized in that, The control component includes: sensors, valves, and instruments.

5. The electrolytic flue gas waste heat deep recovery and multi - utilization system according to claim 1, wherein, Also including: A raw water heating system for the power plant, The raw water heating system for the power plant and the raw water condensate heating system for the waste heat power plant are connected in parallel to form a raw water heating system for the power plant; the raw water heating system for the power plant and the raw water condensate heating system for the waste heat power plant are backup for each other; The condensate heating system for the power plant and the raw water condensate heating system for the waste heat power plant are connected in series to form a condensate heating system for the power plant; the condensate heating system for the power plant and the raw water condensate heating system for the waste heat power plant are backup for each other.

6. The deep recovery and multi - utilization system for waste heat of electrolytic flue gas according to claim 1, wherein, The waste heat refrigeration device includes a lithium bromide unit (including a supporting cooling system) and is used for refrigeration using waste heat in the non-heating season.

7. The electrolytic flue gas waste heat deep recovery and multi - utilization system according to claim 1, characterized in that, The automatic control system is specifically used to preferentially transfer the waste heat of the electrolytic flue gas to the system with a high priority according to a preset priority; Wherein; The first priority includes the hot water supply system; The second priority includes: the heating system, the waste heat refrigeration system The third priority includes: the raw water and condensate heating system for the waste heat power plant.

8. A utilization method of the electrolytic flue gas waste heat deep recovery and multi - utilization system according to any one of claims 1 to 7, characterized in that, Including: Obtaining the operating status of the electrolytic flue gas waste heat recovery system; Based on the hot water supply system, using the waste heat of the electrolytic flue gas to heat to obtain available hot water; If there is still waste heat of the electrolytic flue gas after performing the above steps, during the heating period, according to the operating status of the electrolytic flue gas waste heat recovery system, through the heating system, heating is carried out based on the waste heat of the electrolytic flue gas, and during the cooling period, according to the operating status of the electrolytic flue gas waste heat recovery system, through the waste heat refrigeration system, refrigeration is carried out based on the waste heat of the electrolytic flue gas; If there is still waste heat of the electrolytic flue gas after performing the above steps, heating the raw water condensate of the power plant based on the waste heat of the electrolytic flue gas.

9. An electronic device, characterized in that, Including: A processor, and a memory for storing the executable program of the processor; The processor is configured to implement the utilization method as described in claim 8 by running the program in the memory.

10. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, and when the computer program is run by the processor, the processor is caused to execute the utilization method as described in claim 8.

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