A self-power supply system for a sulfuric acid plant based on thermoelectric power generation

Abstract

The disclosure provides a sulfuric acid plant self-power supply system based on thermoelectric generation, comprising: a plurality of thermoelectric generation modules, the plurality of thermoelectric generation modules are arranged on a plurality of target sections in the sulfuric acid plant respectively, and the high-temperature side of the thermoelectric generation module is connected with the outer surface of the target section, and the low-temperature side of the thermoelectric generation module is located in the environment where the target section is located, wherein the difference between the temperature of the outer surface of the target section and the temperature of the environment where the target section is located is greater than a preset temperature difference; an energy storage device, the electric energy input end of the energy storage device is connected with the electric energy output end of the plurality of thermoelectric generation modules respectively, and the electric energy output end of the energy storage device and the electric energy output end of the thermoelectric generation module are connected with the electric energy input end of the target equipment in the sulfuric acid plant respectively. In the sulfuric acid plant self-power supply system based on thermoelectric generation, the power consumption load of the sulfuric acid plant can be effectively reduced, and the safety of the system can be avoided due to the power failure of the key equipment.

Description

Technical Field

[0001] This disclosure relates to the field of thermoelectric power generation technology, and in particular to a self-powered system for a sulfuric acid plant based on thermoelectric power generation. Background Technology

[0002] The existing sulfuric acid plant has a large electricity load. Under the dual carbon target, reducing electricity consumption requires tapping into the plant's internal potential. At the same time, except for a very few emergency devices, most of the equipment in the plant is powered normally. If a plant-wide power outage occurs, it will cause lighting equipment, valves and other facilities to fail, resulting in low system safety. Summary of the Invention

[0003] This disclosure aims to at least partially address one of the technical problems in the related art.

[0004] Therefore, the purpose of this disclosure is to provide a self-powered system for sulfuric acid plants based on thermoelectric power generation.

[0005] To achieve the above objectives, this disclosure provides a self-powered sulfuric acid plant system based on thermoelectric power generation, comprising: multiple thermoelectric power generation modules, which are respectively installed on multiple target sections within the sulfuric acid plant, with the high-temperature side of each thermoelectric power generation module connected to the outer surface of the target section and the low-temperature side of each thermoelectric power generation module located in the environment of the target section, wherein the temperature difference between the outer surface of the target section and the temperature of the environment of the target section is greater than a preset temperature difference, and the thermoelectric power generation modules are used to generate electricity using the temperature difference between the target section and the environment of the target section; and an energy storage device, the power input terminal of which is connected to the power output terminals of the multiple thermoelectric power generation modules, and the power output terminals of the energy storage device and the thermoelectric power generation modules are respectively connected to the power input terminals of target equipment within the sulfuric acid plant.

[0006] Optionally, the thermoelectric power generation module includes: a thermoelectric power generation unit disposed on the target section, wherein the high-temperature side of the thermoelectric power generation unit is connected to the outer surface of the target section, and the low-temperature side of the thermoelectric power generation unit is located in the environment where the target section is located; the power output terminal of the thermoelectric power generation unit is connected to the power input terminal of the energy storage device and the power input terminal of the target device, respectively; a first temperature sensor, wherein the detection terminal of the first temperature sensor is disposed on the high-temperature side of the thermoelectric power generation unit, and the first temperature sensor is used to detect a first temperature on the high-temperature side of the thermoelectric power generation unit; and a second temperature sensor, wherein the detection terminal of the second temperature sensor is disposed on the low-temperature side of the thermoelectric power generation unit, and the second temperature sensor is used to detect a second temperature on the low-temperature side of the thermoelectric power generation unit.

[0007] Optionally, the thermoelectric power generation module further includes: a current sensor, the detection end of which is disposed at the power output terminal of the thermoelectric power generation unit, and the current sensor is used to detect the output current of the thermoelectric power generation unit; and a voltage sensor, the detection end of which is disposed at the power output terminal of the thermoelectric power generation unit, and the voltage sensor is used to detect the output voltage of the thermoelectric power generation unit.

[0008] Optionally, the system further includes: an inverter module, wherein the power input terminal of the inverter module is connected to the power output terminal of the thermoelectric generator module, and the power output terminal of the inverter module is connected to the power input terminal of the target device, and the inverter module is used to convert the DC power from the thermoelectric generator module into AC power.

[0009] Optionally, the system further includes: an overload protection module, which is disposed at the power output terminal of the thermoelectric generator module and is used for overload protection; and / or a short-circuit protection module, which is disposed at the power output terminal of the thermoelectric generator module and is used for short-circuit protection.

[0010] Optionally, the system further includes a photovoltaic power generation module, which is installed in the open area of ​​the sulfuric acid plant, and the power output terminal of the photovoltaic power generation module is connected to the power input terminal of the energy storage device and the power input terminal of the target device, respectively. The photovoltaic power generation module is used to generate electricity using the solar energy of the open area.

[0011] Optionally, the target section includes at least one of the following sections: a flue gas purification section, with at least one of the thermoelectric power generation modules installed in the flue gas purification section, wherein the flue gas purification section is used for flue gas purification in the sulfuric acid preparation process; a drying and absorption section, with at least one of the thermoelectric power generation modules installed in the drying and absorption section, wherein the drying and absorption section is used for drying and absorption in the sulfuric acid preparation process; a conversion section, with at least one of the thermoelectric power generation modules installed in the conversion section, wherein the conversion section is used for conversion and heat exchange in the sulfuric acid preparation process; a fan section, with at least one of the thermoelectric power generation modules installed in the fan section, wherein the fan section is used for flue gas transportation in the sulfuric acid preparation process; an acid storage section, with at least one of the thermoelectric power generation modules installed in the acid storage section, wherein the acid storage section is used for sulfuric acid storage in the sulfuric acid preparation process; and a sulfur melting and burning section, with at least one of the thermoelectric power generation modules installed in the sulfur melting and burning section, wherein the sulfur melting and burning section is used for sulfur melting and burning in the sulfuric acid preparation process.

[0012] Optionally, the target device includes at least one of the following devices: a lighting device, the power input terminal of which is connected to the power output terminal of the energy storage device and the power output terminal of the thermoelectric generator module, wherein the lighting device is used for lighting in the sulfuric acid plant; a valve, the power input terminal of which is connected to the power output terminal of the energy storage device and the power output terminal of the thermoelectric generator module, wherein the valve is used for controlling the on / off state of passages in the sulfuric acid plant; an instrument, the power input terminal of which is connected to the power output terminal of the energy storage device and the power output terminal of the thermoelectric generator module, wherein the instrument is used for monitoring the operating parameters of the sulfuric acid plant; and a communication device, the power input terminal of which is connected to the power output terminal of the energy storage device and the power output terminal of the thermoelectric generator module, wherein the communication device is used for wired and / or wireless communication in the sulfuric acid plant.

[0013] Optionally, the target section includes: an anode protection heat exchanger, and the thermoelectric power generation module is installed on the anode protection heat exchanger; the target equipment includes: a potentiostat, the power input terminal of the potentiostat is connected to the power output terminal of the thermoelectric power generation module, and the potentiostat is used for potential control on the surface of the anode protection heat exchanger.

[0014] Optionally, the target section includes: a motor, and the thermoelectric power generation module is mounted on the motor; the target equipment includes: a fan, the power input terminal of the fan is connected to the power output terminal of the thermoelectric power generation module, and the fan is used for heat dissipation of the motor.

[0015] The technical solution provided in this disclosure may include the following beneficial effects:

[0016] Thermoelectric generators utilize the waste heat of the target section within a sulfuric acid plant to generate electricity and supply it to the target equipment within the plant. This not only effectively reduces the plant's electrical load and lowers grid pressure, but also ensures that even in the event of a plant-wide power outage, the waste heat of the target section will not dissipate quickly, allowing the thermoelectric generators to continue generating electricity for a considerable period and enabling the continuous operation of the target equipment within the sulfuric acid plant. This prevents the system's safety from being compromised by the power outage of critical equipment.

[0017] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1This is a circuit diagram of a sulfuric acid plant self-powered system based on thermoelectric power generation according to an embodiment of this disclosure;

[0020] As shown in the figure: 1. Thermoelectric power generation module, 11. Thermoelectric power generation unit, 12. First temperature sensor, 13. Second temperature sensor, 14. Current sensor, 15. Voltage sensor.

[0021] 2. Energy storage device; 3. Inverter module; 4. Overload protection module; 5. Short circuit protection module; 6. Photovoltaic power generation module; 100. Target section; 200. Target equipment. Detailed Implementation

[0022] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are used only to explain this disclosure, and should not be construed as limiting this disclosure. Rather, embodiments of this disclosure include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0023] like Figure 1 As shown in the present invention, an embodiment of the present invention proposes a self-powered sulfuric acid plant based on thermoelectric power generation, comprising: multiple thermoelectric power generation modules 1 and an energy storage device 2. The multiple thermoelectric power generation modules 1 are respectively installed on multiple target sections 100 within the sulfuric acid plant, and the high-temperature side of the thermoelectric power generation module 1 is connected to the outer surface of the target section 100, while the low-temperature side of the thermoelectric power generation module 1 is located in the environment where the target section 100 is located. The temperature difference between the outer surface temperature of the target section 100 and the temperature of the environment where the target section 100 is located is greater than a preset temperature difference. The thermoelectric power generation module 1 is used to generate electricity by utilizing the temperature difference between the target section 100 and the environment where the target section 100 is located. The power input terminal of the energy storage device 2 is connected to the power output terminal of the multiple thermoelectric power generation modules 1, and the power output terminal of the energy storage device 2 and the power output terminal of the thermoelectric power generation module 1 are respectively connected to the power input terminal of the target equipment 200 within the sulfuric acid plant.

[0024] It is understandable that, since multiple thermoelectric power generation modules 1 are respectively installed on multiple target sections 100 within the sulfuric acid plant, and the high-temperature side of the thermoelectric power generation module 1 is connected to the outer surface of the target section 100, while the low-temperature side of the thermoelectric power generation module 1 is located in the environment where the target section 100 is located, the thermoelectric power generation module 1 can generate electricity by utilizing the temperature difference between the target section 100 and the environment where the target section 100 is located. Furthermore, since the power input terminal of the energy storage device 2 is respectively connected to the power output terminals of multiple thermoelectric power generation modules 1, and the power output terminals of the energy storage device 2 and the thermoelectric power generation module 1 are respectively connected to the power input terminal of the target equipment 200 within the sulfuric acid plant, the thermoelectric power generation module 1 can directly supply power to the target equipment 200 within the sulfuric acid plant, or indirectly supply power to the target equipment 200 within the sulfuric acid plant using the energy storage device 2.

[0025] Therefore, the thermoelectric power generation module 1 utilizes the waste heat of the target section 100 in the sulfuric acid plant to generate electricity and supply the generated electricity to the target equipment 200 in the sulfuric acid plant. This not only effectively reduces the electricity load of the sulfuric acid plant and reduces the pressure on the power grid, but also ensures that the waste heat of the target section 100 will not disappear quickly in the event of a plant-wide power outage. This allows the thermoelectric power generation module 1 to continue generating electricity for a longer period of time and enable the target equipment 200 in the sulfuric acid plant to continue operating, thereby avoiding the impact of power outages on the system's safety due to the loss of power to critical equipment.

[0026] It should be noted that sulfuric acid is one of the most important chemicals in industrial production, widely used in fertilizers, chemicals, metallurgy, and petroleum refining. Sulfuric acid plants use equipment such as sulfur incinerators, converters, and absorption towers to produce sulfuric acid.

[0027] In this sulfuric acid plant, the surface heat energy of various equipment and pipelines is not well utilized. Although some have insulation measures, their surface temperature is still very high. During the production process, heat is dissipated into the environment. This part of the heat energy usually cannot be recovered, resulting in a large amount of energy waste. In this embodiment, the thermoelectric power generation module 1 uses the waste heat of the target section 100 to generate electricity and supplies the generated electricity to the target equipment 200 in the sulfuric acid plant. This not only improves the heat utilization rate of the sulfuric acid plant, but also realizes self-powered power supply, thereby reducing power consumption and carbon emissions.

[0028] In addition, when a sulfuric acid plant experiences a plant-wide power outage, except for a few emergency power supplies, lighting equipment, valves and other facilities will lose power, which not only makes maintenance difficult but also poses safety hazards. In this embodiment, even if a plant-wide power outage occurs, the cooperation between the thermoelectric generator module 1 and the energy storage device 2 enables the target equipment 200 in the sulfuric acid plant to continue to operate, thereby providing a safety guarantee for system maintenance and providing a safe power supply for the process system.

[0029] Thermoelectric power generation technology is based on the Seebeck effect, which states that when there is a temperature difference between the two ends of two different conductors or semiconductors, an electromotive force is generated in the circuit. In this embodiment, the thermoelectric power generation module 1 is installed on the high-temperature surface of each target section 100 in the plant, utilizing the temperature difference between the target section 100 and the environment to generate electricity to power lighting, valves, and other equipment. This embodiment utilizes existing mature thermoelectric power generation technology, mainly its existing power generation modules, and proposes a technical solution for the sulfuric acid plant to generate its own power using thermoelectric energy, combined with the operating conditions of the sulfuric acid plant.

[0030] Thermoelectric generator module 1 is used to generate electricity from the waste heat of the target section 100 in the sulfuric acid plant and supply the generated electricity to the target equipment 200 in the sulfuric acid plant, or to store the generated electricity in the energy storage device 2 to indirectly power the target equipment 200 in the sulfuric acid plant. The specific type of thermoelectric generator module 1 can be set according to actual needs and is not limited thereto. When installing thermoelectric generator module 1, it should be ensured that the cold side of the module is in contact with the ambient air and the hot side is in close contact with the equipment surface. The thermoelectric generator module 1 can be fixed to the equipment surface using special high-temperature adhesive or mechanical fixing methods. During installation, it is necessary to ensure good contact between the module and the equipment surface to improve heat conduction efficiency.

[0031] Multiple thermoelectric power generation modules 1 can be connected in series or parallel to meet the voltage and current requirements of the target device 200. Furthermore, a suitable circuit topology can be designed according to actual needs.

[0032] During use, the performance of the thermoelectric generator module 1 can be checked regularly, and dust and debris on the surface of the equipment can be cleaned to ensure heat transfer efficiency.

[0033] The energy storage device 2 is used to store the excess electrical energy generated by the thermoelectric generator module 1, so as to supply power to the target equipment 200 in the sulfuric acid plant during periods when the power generation capacity of the thermoelectric generator module 1 is insufficient. The specific type of energy storage device 2 can be set according to actual needs and there are no restrictions. For example, the energy storage device 2 can be a battery, a supercapacitor, etc. The energy storage device 2 can be configured with inverters, transformers, etc., according to actual needs to meet the power demand.

[0034] The target section 100 in the sulfuric acid plant refers to equipment, pipelines, etc. with a large amount of residual heat on their surface. The selection of the target section 100 can be determined based on the actual temperature difference, operating conditions, etc., and there are no restrictions on this.

[0035] The target equipment 200 in the sulfuric acid plant is equipment that can generate electricity using the thermoelectric generator module 1, such as lighting equipment, valves, etc. The selection of target equipment 200 can be determined based on equipment parameters, functions, etc., and there are no restrictions on this.

[0036] The preset temperature difference can be set according to actual needs, and there are no restrictions on it.

[0037] like Figure 1 As shown, in some embodiments, the thermoelectric power generation module 1 includes: a thermoelectric power generation unit 11, a first temperature sensor 12, and a second temperature sensor 13. The thermoelectric power generation unit 11 is disposed on the target section 100, and the high-temperature side of the thermoelectric power generation unit 11 is connected to the outer surface of the target section 100. The low-temperature side of the thermoelectric power generation unit 11 is located in the environment where the target section 100 is located. The power output terminal of the thermoelectric power generation unit 11 is connected to the power input terminal of the energy storage device 2 and the power input terminal of the target device 200, respectively. The detection terminal of the first temperature sensor 12 is disposed on the high-temperature side of the thermoelectric power generation unit 11, and the first temperature sensor 12 is used to detect the first temperature of the high-temperature side of the thermoelectric power generation unit 11. The detection terminal of the second temperature sensor 13 is disposed on the low-temperature side of the thermoelectric power generation unit 11, and the second temperature sensor 13 is used to detect the second temperature of the low-temperature side of the thermoelectric power generation unit 11.

[0038] It is understandable that, since the thermoelectric power generation unit 11 is installed on the target section 100, and the high-temperature side of the thermoelectric power generation unit 11 is connected to the outer surface of the target section 100, while the low-temperature side of the thermoelectric power generation unit 11 is located in the environment where the target section 100 is located, the thermoelectric power generation unit 11 can generate electricity by utilizing the temperature difference between the target section 100 and the environment where the target section 100 is located. Furthermore, since the power output terminal of the thermoelectric power generation unit 11 is connected to the power input terminal of the energy storage device 2 and the power input terminal of the target equipment 200 respectively, the thermoelectric power generation unit 11 can directly supply power to the target equipment 200 in the sulfuric acid plant, or indirectly supply power to the target equipment 200 in the sulfuric acid plant by utilizing the energy storage device 2.

[0039] Since the detection end of the first temperature sensor 12 is located on the high-temperature side of the thermoelectric power generation unit 11, the first temperature sensor 12 can detect the first temperature on the high-temperature side of the thermoelectric power generation unit 11. Furthermore, since the detection end of the second temperature sensor 13 is located on the low-temperature side of the thermoelectric power generation unit 11, the second temperature sensor 13 can detect the second temperature on the low-temperature side of the thermoelectric power generation unit 11. Thus, by acquiring the first and second temperatures, the system can monitor the temperature difference between the target section 100 and the environment in which the target section 100 is located in real time, thereby ensuring high power generation efficiency.

[0040] It should be noted that the thermoelectric power generation unit 11 generates electricity based on the Seebeck effect. The specific type of the thermoelectric power generation unit 11 can be set according to actual needs and there are no restrictions on it. For example, the thermoelectric power generation unit 11 uses high-performance bismuth telluride (Bi2Te3) based thermoelectric material, which has high thermoelectric conversion efficiency, good high temperature resistance and long service life.

[0041] The first temperature sensor 12 is used to detect the first temperature on the high-temperature side of the thermoelectric generator unit 11. The specific type of the first temperature sensor 12 can be set according to actual needs and is not limited thereto.

[0042] The second temperature sensor 13 is used to detect the second temperature on the low-temperature side of the thermoelectric generator unit 11. The specific type of the second temperature sensor 13 can be set according to actual needs and is not limited thereto.

[0043] like Figure 1 As shown, in some embodiments, the thermoelectric power generation module 1 further includes a current sensor 14 and a voltage sensor 15. The detection end of the current sensor 14 is disposed at the power output end of the thermoelectric power generation unit 11, and the current sensor 14 is used to detect the output current of the thermoelectric power generation unit 11. The detection end of the voltage sensor 15 is disposed at the power output end of the thermoelectric power generation unit 11, and the voltage sensor 15 is used to detect the output voltage of the thermoelectric power generation unit 11.

[0044] Understandably, since the detection terminal of the current sensor 14 is located at the power output terminal of the thermoelectric generator 11, the current sensor 14 can detect the output current of the thermoelectric generator 11. Similarly, since the detection terminal of the voltage sensor 15 is located at the power output terminal of the thermoelectric generator 11, the voltage sensor 15 can detect the output voltage of the thermoelectric generator 11. Therefore, by acquiring the output current and output voltage of the thermoelectric generator 11, the output power of the thermoelectric generator 11 can be monitored, thereby ensuring the stable operation of the system.

[0045] It should be noted that the current sensor 14 is used to detect the output current of the thermoelectric generator unit 11. The specific type of the current sensor 14 can be set according to actual needs and there are no restrictions on it.

[0046] Voltage sensor 15 is used to detect the output voltage of thermoelectric generator 11. The specific type of voltage sensor 15 can be set according to actual needs and there is no limitation thereto.

[0047] like Figure 1 As shown, in some embodiments, the system further includes an inverter module 3, the power input terminal of the inverter module 3 is connected to the power output terminal of the thermoelectric generator module 1, and the power output terminal of the inverter module 3 is connected to the power input terminal of the target device 200. The inverter module 3 is used to convert the DC power of the thermoelectric generator module 1 into AC power.

[0048] Understandably, since the power input terminal of inverter module 3 is connected to the power output terminal of thermoelectric generator module 1, and the power output terminal of inverter module 3 is connected to the power input terminal of target device 200, the DC power generated by thermoelectric generator module 1 can be converted into AC power by inverter module 3, thereby meeting the power demand of target device 200.

[0049] It should be noted that inverter module 3 is used to convert the DC power from thermoelectric generator module 1 into AC power. The specific type of inverter module 3 can be set according to actual needs and there are no restrictions on it. For example, inverter module 3 can be an inverter.

[0050] The DC power generated by the thermoelectric generator module 1 can be processed by transformers and filters and then stored in the energy storage device 2. The energy storage device 2 is then converted into power supply for the target device 200 by an inverter and other means.

[0051] like Figure 1 As shown, in some embodiments, the system further includes: an overload protection module 4 and / or a short-circuit protection module 5. The overload protection module 4 is located at the power output terminal of the thermoelectric power generation module 1 and is used for overload protection. The short-circuit protection module 5 is located at the power output terminal of the thermoelectric power generation module 1 and is used for short-circuit protection.

[0052] Understandably, since the overload protection module 4 is located at the power output terminal of the thermoelectric generator module 1, the power output terminal of the thermoelectric generator module 1 can be protected against overload using the overload protection module 4. Furthermore, since the short-circuit protection module 5 is located at the power output terminal of the thermoelectric generator module 1, the power output terminal of the thermoelectric generator module 1 can be protected against short circuit using the short-circuit protection module 5. Therefore, by utilizing overload protection and short-circuit protection, the safe operation of the system can be ensured.

[0053] It should be noted that the overload protection module 4 is used for overload protection of the power output terminal of the thermoelectric generator module 1. The specific type of the overload protection module 4 can be set according to actual needs and there is no restriction. For example, the overload protection module 4 includes: current detection part, control part, tripping part, etc., to prevent the circuit from being damaged due to the current exceeding the rated value. Its core function is to detect the current and cut off the circuit when it exceeds the set value.

[0054] The short-circuit protection module 5 is used for short-circuit protection at the power output terminal of the thermoelectric generator module 1. The specific type of the short-circuit protection module 5 can be set according to actual needs and is not limited thereto. For example, the short-circuit protection module 5 includes: current detection part, control part, tripping part, arc extinguishing part, etc. The short-circuit protection module 5 is used to prevent the circuit from being damaged due to short circuit (sudden increase in current). Its core function is to quickly detect short circuit and disconnect the circuit.

[0055] like Figure 1 As shown, in some embodiments, the system further includes a photovoltaic power generation module 6, which is installed in the open area of ​​the sulfuric acid plant, and the power output terminal of the photovoltaic power generation module 6 is connected to the power input terminal of the energy storage device 2 and the power input terminal of the target device 200, respectively. The photovoltaic power generation module 6 is used to generate electricity using the solar energy of the open area.

[0056] It is understandable that, since the photovoltaic power generation module 6 is set up in the open area of ​​the sulfuric acid plant, and the power output terminal of the photovoltaic power generation module 6 is connected to the power input terminal of the energy storage device 2 and the power input terminal of the target device 200 respectively, the photovoltaic power generation module 6 can generate electricity using the light energy of the open area and supply the generated electricity to the target device 200 in the sulfuric acid plant and / or store it in the energy storage device 2, thereby working in conjunction with the thermoelectric power generation module 1 to achieve a stable power supply to the target device 200 in the sulfuric acid plant.

[0057] It should be noted that the photovoltaic power generation module 6 is used to generate electricity using solar energy, in conjunction with the thermoelectric power generation module 1 to address the situation where the surface temperature difference of some equipment is small in summer, resulting in insufficient power generation capacity. The specific type of photovoltaic power generation module 6 can be set according to actual needs, and there are no restrictions on it.

[0058] In some embodiments, the target section 100 includes at least one of the following sections: a flue gas purification section, a drying and absorption section, a conversion section, a fan section, an acid storage section, and a sulfur melting and combustion section. At least one thermoelectric generator module 1 is installed in the flue gas purification section, wherein the flue gas purification section is used for flue gas purification in the sulfuric acid preparation process; at least one thermoelectric generator module 1 is installed in the drying and absorption section, wherein the drying and absorption section is used for drying and absorption in the sulfuric acid preparation process; at least one thermoelectric generator module 1 is installed in the conversion section, wherein the conversion section is used for conversion and heat exchange in the sulfuric acid preparation process; at least one thermoelectric generator module 1 is installed in the fan section, wherein the fan section is used for flue gas transportation in the sulfuric acid preparation process; at least one thermoelectric generator module 1 is installed in the acid storage section, wherein the acid storage section is used for sulfuric acid storage in the sulfuric acid preparation process; and at least one thermoelectric generator module 1 is installed in the sulfur melting and combustion section, wherein the sulfur melting and combustion section is used for sulfur melting and combustion in the sulfuric acid preparation process.

[0059] Understandably, in the flue gas purification section of a sulfuric acid plant, the inlet flue gas temperature is approximately 300℃, the outlet flue gas temperature is approximately 40℃, and the circulating acid temperature is 40℃-60℃. The entire section is primarily constructed of fiberglass, and there is a temperature difference of at least 20℃-40℃ between the outer surface of the equipment and pipelines and the outdoor environment. Therefore, the thermoelectric generator module 1 is installed in the flue gas purification section and utilizes the waste heat from the purification section to generate electricity, which is then supplied to the target equipment 200, thereby reducing the electricity load of the sulfuric acid plant and improving system safety.

[0060] Among them, the section of the flue gas purification process in a sulfuric acid plant that is most suitable for utilization is the reverse spray pipe of the high-efficiency scrubber for flue gas purification.

[0061] For the drying and absorption section within the sulfuric acid plant, the inlet flue gas temperature of the absorption tower is 160℃-200℃, the outlet flue gas temperature is 60℃-80℃, and the circulating acid temperature is 50℃-100℃. The entire section is primarily constructed of stainless steel and carbon steel, and the temperature difference between the outer surface of the equipment and pipelines and the outdoor environment is at least 20℃-40℃, reaching approximately 200℃ in some locations. Therefore, a thermoelectric power generation module 1 is installed on the drying and absorption section, utilizing the waste heat to generate electricity and supplying it to the target equipment 200, thereby reducing the sulfuric acid plant's electrical load and improving system safety.

[0062] In the conversion section of a sulfuric acid plant, the converter, heat exchanger, and flue gas ducts all contain high-temperature gases, and there is an external insulation layer with an outer surface temperature of approximately 80°C, resulting in a temperature difference of at least 20°C-40°C between the insulation layer and the outdoor ambient temperature. Therefore, a thermoelectric power generation module 1 is installed in the conversion section, utilizing the waste heat from the conversion section to generate electricity, which is then supplied to the target equipment 200, thereby reducing the sulfuric acid plant's electrical load and improving system safety.

[0063] In the blower section of the sulfuric acid plant, the temperature difference between the indoor and outdoor areas of the blower room reaches 20℃-40℃. Therefore, the thermoelectric power generation module 1 is installed on the blower section and uses the waste heat of the blower section to generate electricity, which is then supplied to the target equipment 200, thereby reducing the electricity load of the sulfuric acid plant and improving system safety.

[0064] In the acid storage section of a sulfuric acid plant, the temperature of the finished acid is typically 40℃, and there is a significant temperature difference between the inside and outside during winter. Therefore, a thermoelectric power generation module 1 is installed in the acid storage section and utilizes the waste heat of the storage section to generate electricity, which is then supplied to the target equipment 200, thereby reducing the electricity load of the sulfuric acid plant and improving system safety.

[0065] For the sulfur melting and incineration section of a sulfuric acid plant, the operating temperature of the sulfur melting process is 140℃-150℃, and the operating temperature of the incineration furnace is around 1000℃. The outer surface of these equipment and pipelines has a temperature difference of at least 20℃-40℃ compared to the outdoor environment. Therefore, a thermoelectric power generation module 1 is installed on the sulfur melting and incineration section, utilizing the waste heat from this section to generate electricity and supply it to the target equipment 200, thereby reducing the electricity load of the sulfuric acid plant and improving system safety.

[0066] In some embodiments, the target device 200 includes at least one of the following devices: lighting equipment, valves, instruments, and communication equipment. The power input terminal of the lighting equipment is connected to the power output terminal of the energy storage device 2 and the power output terminal of the thermoelectric generator module 1, respectively. The lighting equipment is used for lighting in the sulfuric acid plant. The power input terminal of the valve is connected to the power output terminal of the energy storage device 2 and the power output terminal of the thermoelectric generator module 1, respectively. The valve is used for controlling the opening and closing of passages in the sulfuric acid plant. The power input terminal of the instrument is connected to the power output terminal of the energy storage device 2 and the power output terminal of the thermoelectric generator module 1, respectively. The instrument is used for monitoring the operating parameters of the sulfuric acid plant. The power input terminal of the communication equipment is connected to the power output terminal of the energy storage device 2 and the power output terminal of the thermoelectric generator module 1, respectively. The communication equipment is used for wired and / or wireless communication in the sulfuric acid plant.

[0067] It is understandable that, since the power input terminal of the lighting equipment is connected to the power output terminal of the energy storage device 2 and the power output terminal of the thermoelectric generator module 1 respectively, the thermoelectric generator module 1 uses the waste heat of the target section 100 in the sulfuric acid plant to generate electricity and supply the generated electricity to the lighting equipment in the sulfuric acid plant, thereby realizing the continuous operation of the lighting equipment, reducing the power load of the sulfuric acid plant and improving the system safety.

[0068] Since the power input terminal of the valve is connected to the power output terminal of the energy storage device 2 and the power output terminal of the thermoelectric generator module 1 respectively, the thermoelectric generator module 1 uses the waste heat of the target section 100 in the sulfuric acid plant to generate electricity and supply the generated electricity to the valve in the sulfuric acid plant, thereby realizing the continuous operation of the valve, reducing the power load of the sulfuric acid plant and improving the system safety.

[0069] Since the power input terminal of the instrument is connected to the power output terminal of the energy storage device 2 and the power output terminal of the thermoelectric generator module 1 respectively, the thermoelectric generator module 1 uses the waste heat of the target section 100 in the sulfuric acid plant to generate electricity and supply the generated electricity to the instrument in the sulfuric acid plant, thereby realizing the continuous operation of the instrument, reducing the power load of the sulfuric acid plant and improving the system safety.

[0070] Since the power input terminal of the communication equipment is connected to the power output terminal of the energy storage device 2 and the power output terminal of the thermoelectric generator module 1 respectively, the thermoelectric generator module 1 uses the waste heat of the target section 100 in the sulfuric acid plant to generate electricity and supply the generated electricity to the communication equipment in the sulfuric acid plant, thereby realizing the continuous operation of the communication equipment, reducing the power load of the sulfuric acid plant and improving the system safety.

[0071] It should be noted that high-efficiency and energy-saving LED lamps can be selected for lighting equipment to improve lighting efficiency and reduce energy consumption. At the same time, based on a stable power supply, an intelligent lighting control system can be installed to automatically adjust the lighting brightness according to actual production needs, further saving energy.

[0072] The communication equipment can be either wired or wireless, without limitation. In this embodiment, wireless communication equipment is preferred. For example, smart meters and telecommunications equipment that support 5G communication can be selected, or existing equipment can be modified to add a 5G communication module. Furthermore, an intelligent control system can be installed to automatically adjust the operating status of the equipment according to actual production needs, further saving energy.

[0073] 5G communication modules suitable for industrial applications can be selected and installed on instruments and telecommunications equipment to achieve wireless data transmission. It is essential to ensure that the 5G communication modules support communication protocols compatible with DCS systems, such as Modbus TCP / IP and OPC UA. Simultaneously, a 5G network should be configured to ensure stable signal transmission. Furthermore, collaboration with operators can be undertaken to optimize network coverage, ensuring reliable data transmission and low latency.

[0074] In some embodiments, the target section 100 includes: an anode protection heat exchanger, and a thermoelectric power generation module 1 is disposed on the anode protection heat exchanger; the target device 200 includes: a potentiostat, the power input terminal of the potentiostat is connected to the power output terminal of the thermoelectric power generation module 1, and the potentiostat is used for potential control of the surface of the anode protection heat exchanger.

[0075] Understandably, since the thermoelectric power generation module 1 is installed on the anode protection heat exchanger, and the power input terminal of the potentiostat is connected to the power output terminal of the thermoelectric power generation module 1, the thermoelectric power generation module 1 uses the waste heat of the anode protection heat exchanger to generate electricity and supplies the generated electricity to the potentiostat. This realizes the self-generation and self-use of the power of the anode protection heat exchanger and the potentiostat system, thereby reducing the power load of the sulfuric acid plant and improving system safety.

[0076] It should be noted that the anode protection heat exchanger belongs to the drying and absorption section.

[0077] In some embodiments, the target section 100 includes a motor, and the thermoelectric generator module 1 is mounted on the motor; the target device 200 includes a fan, the power input terminal of the fan is connected to the power output terminal of the thermoelectric generator module 1, and the fan is used for heat dissipation of the motor.

[0078] Understandably, since the thermoelectric generator module 1 is installed on the motor and the power input terminal of the fan is connected to the power output terminal of the thermoelectric generator module 1, the thermoelectric generator module 1 uses the waste heat of the motor to generate electricity and supplies the generated electricity to the fan, thereby realizing the self-generation and self-use of the heat dissipation system's power, thereby improving motor efficiency, reducing the power load of the sulfuric acid plant and enhancing system safety.

[0079] It should be noted that the motor can be either the motor of a dilute acid pump or the motor of a concentrated acid pump. In addition, by using temperature sensor and current sensor 14, the motor temperature and fan operating status can be monitored in real time to ensure the motor heat dissipation effect.

[0080] Since smelting furnaces, waste heat boilers, electrostatic precipitators, etc. also possess unused temperature difference energy, the system in this embodiment can be extended to the entire non-ferrous smelting plant.

[0081] The system in this embodiment has at least the following advantages:

[0082] Energy recovery: By utilizing the waste heat generated during the operation of factory equipment, energy can be reused, reducing energy waste.

[0083] Economic benefits: Reduced reliance on external power sources and lower factory operating costs.

[0084] Environmental benefits: Reduces carbon emissions and meets environmental protection requirements.

[0085] Stable operation: After the thermoelectric generator generates electricity, it can provide a stable power supply to the point of use, reducing the safety hazards caused by power outages.

[0086] It should be noted that in the description of this disclosure, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0087] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.

[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0089] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A self-powered system for a sulfuric acid plant based on thermoelectric power generation, characterized in that, include: Multiple thermoelectric power generation modules are respectively installed on multiple target sections within the sulfuric acid plant. The high-temperature side of each thermoelectric power generation module is connected to the outer surface of the target section, while the low-temperature side of each thermoelectric power generation module is located in the environment where the target section is located. The temperature difference between the outer surface temperature of the target section and the temperature of the environment where the target section is located is greater than a preset temperature difference. The thermoelectric power generation modules are used to generate electricity by utilizing the temperature difference between the target section and the environment where the target section is located. An energy storage device, wherein the power input terminal of the energy storage device is connected to the power output terminals of a plurality of thermoelectric power generation modules, and the power output terminals of the energy storage device and the thermoelectric power generation modules are respectively connected to the power input terminals of the target equipment in the sulfuric acid plant. The system further includes an overload protection module and a short-circuit protection module. The overload protection module is located at the power output terminal of the thermoelectric generator module and is used for overload protection. The short-circuit protection module is located at the power output terminal of the thermoelectric generator module and is used for short-circuit protection.

2. The self-powered sulfuric acid plant system based on thermoelectric power generation according to claim 1, characterized in that, The thermoelectric power generation module includes: A thermoelectric power generation unit is installed on the target section, with the high-temperature side of the thermoelectric power generation unit connected to the outer surface of the target section and the low-temperature side of the thermoelectric power generation unit located in the environment where the target section is located. The power output terminal of the thermoelectric power generation unit is connected to the power input terminal of the energy storage device and the power input terminal of the target device, respectively. A first temperature sensor, wherein the detection end of the first temperature sensor is disposed on the high-temperature side of the thermoelectric power generation unit, and the first temperature sensor is used to detect the first temperature on the high-temperature side of the thermoelectric power generation unit. The second temperature sensor has its detection end located on the low-temperature side of the thermoelectric generator unit, and is used to detect the second temperature on the low-temperature side of the thermoelectric generator unit.

3. The self-powered sulfuric acid plant system based on thermoelectric power generation according to claim 2, characterized in that, The thermoelectric power generation module also includes: A current sensor is provided, wherein the detection end of the current sensor is disposed at the power output end of the thermoelectric power generation unit, and the current sensor is used to detect the output current of the thermoelectric power generation unit. A voltage sensor is provided, with its detection end located at the power output end of the thermoelectric generator unit, and the voltage sensor is used to detect the output voltage of the thermoelectric generator unit.

4. The self-powered sulfuric acid plant system based on thermoelectric power generation according to claim 1, characterized in that, The system also includes: An inverter module is provided, wherein the power input terminal of the inverter module is connected to the power output terminal of the thermoelectric generator module, and the power output terminal of the inverter module is connected to the power input terminal of the target device. The inverter module is used to convert the direct current (DC) power from the thermoelectric generator module into alternating current (AC).

5. The self-powered sulfuric acid plant system based on thermoelectric power generation according to claim 1, characterized in that, The system also includes: A photovoltaic power generation module is installed in the open-air area of ​​the sulfuric acid plant, and the power output terminal of the photovoltaic power generation module is connected to the power input terminal of the energy storage device and the power input terminal of the target device, respectively. The photovoltaic power generation module is used to generate electricity using the solar energy of the open-air area.

6. The self-powered sulfuric acid plant system based on thermoelectric power generation according to claim 1, characterized in that, The target section includes at least one of the following sections: A flue gas purification section, wherein at least one of the aforementioned thermoelectric power generation modules is installed on the flue gas purification section, wherein the flue gas purification section is used for flue gas purification in the sulfuric acid preparation process; A drying and absorption section, wherein at least one of the aforementioned thermoelectric power generation modules is installed on the drying and absorption section, wherein the drying and absorption section is used for drying and absorption in the sulfuric acid preparation process; A conversion section, wherein at least one of the thermoelectric power generation modules is installed on the conversion section, wherein the conversion section is used for conversion and heat exchange in the sulfuric acid preparation process; A wind turbine section, wherein at least one of the aforementioned thermoelectric power generation modules is installed on the wind turbine section, wherein the wind turbine section is used for flue gas transportation in the sulfuric acid preparation process; An acid storage section, wherein at least one of the aforementioned thermoelectric power generation modules is installed on the acid storage section, wherein the acid storage section is used for the storage of sulfuric acid in the sulfuric acid preparation process; The sulfur melting and burning section includes at least one of the aforementioned thermoelectric power generation modules, wherein the sulfur melting and burning section is used for sulfur melting and burning in the sulfuric acid preparation process.

7. The self-powered sulfuric acid plant system based on thermoelectric power generation according to claim 1, characterized in that, The target device includes at least one of the following devices: The lighting equipment has its power input terminal connected to the power output terminal of the energy storage device and the power output terminal of the thermoelectric generator module, respectively, and is used for lighting in the sulfuric acid plant. The valve has its electrical input terminal connected to the electrical output terminal of the energy storage device and the electrical output terminal of the thermoelectric power generation module, respectively. The valve is used for on / off control of the passage in the sulfuric acid plant. The instrument has its power input terminal connected to the power output terminal of the energy storage device and the power output terminal of the thermoelectric generator module, respectively. The instrument is used to monitor the operating parameters of the sulfuric acid plant. A communication device, wherein the power input terminal of the communication device is connected to the power output terminal of the energy storage device and the power output terminal of the thermoelectric generator module, wherein the communication device is used for wired and / or wireless communication of the sulfuric acid plant.

8. The self-powered sulfuric acid plant system based on thermoelectric power generation according to claim 1, characterized in that, The target section includes: an anode protection heat exchanger, and the thermoelectric power generation module is installed on the anode protection heat exchanger; The target device includes a potentiostat, the power input terminal of which is connected to the power output terminal of the thermoelectric generator module, and the potentiostat is used for potential control of the surface of the anode protection heat exchanger.

9. The self-powered sulfuric acid plant system based on thermoelectric power generation according to claim 1, characterized in that, The target section includes: a motor, and the thermoelectric power generation module is installed on the motor; The target device includes a fan, the power input terminal of which is connected to the power output terminal of the thermoelectric generator module, and the fan is used for heat dissipation of the motor.

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