Positive electrode material combined heat exchange device
By designing a combined heat exchange device for cathode materials during the lithium iron phosphate production process, and utilizing plate heat exchangers and regenerative RTO furnaces to recover heat from the high-temperature exhaust gas of the RTO furnace, the problem of unused high-temperature exhaust gas was solved, achieving efficient energy utilization and environmental cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU XINPU DRYING ENG TECH CO LTD
- Filing Date
- 2025-08-06
- Publication Date
- 2026-07-24
AI Technical Summary
In the production process of lithium iron phosphate, the high-temperature exhaust gas heat energy emitted by the RTO furnace is not effectively recovered and utilized, resulting in energy waste and increased production costs.
Design a positive electrode material combined heat exchange device to achieve indirect heat exchange between high-temperature exhaust gas from RTO furnace and spray drying intake air through plate heat exchanger. Combined with regenerative RTO furnace to recover heat from exhaust gas for preheating spray drying intake air, reducing natural gas consumption.
It significantly reduces the energy consumption of spray drying hot air furnaces, improves heat utilization, reduces production costs, and reduces pollutant emissions, achieving the synergistic goal of environmental protection and energy conservation.
Smart Images
Figure CN224551554U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drying equipment technology, and in particular to a positive electrode material combined heat exchange device. Background Technology
[0002] The new energy industry is booming, and the manufacturing of new energy batteries continues to heat up. Lithium iron phosphate (LFP), as a cathode material, has become the focus of industry attention due to its advantages of low cost, good safety, and long cycle life. However, with many manufacturers putting new production lines into operation, the LFP market supply is gradually becoming saturated, leading to fierce price competition. The pressure to lower prices is prompting companies to seek cost reduction paths, and reducing production energy consumption has become a key breakthrough.
[0003] The production process of lithium iron phosphate involves several steps, including pulping, spray drying to produce fine powder, and roller kiln sintering. Roller kiln sintering generates a large amount of organic matter, requiring the use of an RTO (Regenerative Thermal Oxidizer) furnace to treat the exhaust gas. However, the exhaust gas temperature after RTO treatment is quite high; directly venting it would waste a significant amount of heat energy, contradicting energy conservation principles and increasing production costs. Therefore, how to recover and utilize the waste heat from this high-temperature exhaust gas has become a pressing technical problem to be solved in this field. Utility Model Content
[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a positive electrode material combined heat exchange device that indirectly exchanges heat between the high-temperature exhaust gas emitted from the RTO furnace and the inlet air of the spray dryer, thereby reducing the natural gas consumption of the spray dryer hot air furnace and reducing energy consumption.
[0005] The technical solution adopted by this utility model to solve its technical problem is: a positive electrode material combined heat exchange device, including a spray hot air furnace, a spray host, a spray dust removal and material collection device, a roller kiln and an RTO furnace connected in sequence.
[0006] The spray host is used to receive materials and atomize them through the atomizer above, so as to achieve preliminary heat exchange and drying of the materials with hot air.
[0007] The spray dust removal and material collection device is used to separate the powder and gas after drying by the spray host. The powder is guided to the roller kiln, and the separated gas is discharged into the air through the spray exhaust device.
[0008] The roller kiln is used for high-temperature roasting of powder materials, and the waste gas containing organic matter generated is directed to the RTO furnace.
[0009] The RTO furnace is used to heat organic waste gas to above 760°C, causing VOCs to oxidize and decompose, and the treated high-temperature waste gas is then directed to a plate heat exchanger.
[0010] The plate heat exchanger is used to achieve indirect heat exchange between the high-temperature exhaust gas discharged from the RTO furnace and the flash evaporation inlet air. After the flash evaporation inlet air is heat-exchanged, it is guided to the spray hot air furnace.
[0011] The spray hot air furnace is used to further heat the incoming air after it has been heated by the plate heat exchanger.
[0012] Furthermore, the plate heat exchanger is equipped with a spray blower and an exhaust device. The spray blower is used to provide air intake for the spray system, and the exhaust device is used to guide the exhaust gas from the plate heat exchanger to be discharged after heat exchange.
[0013] Furthermore, the plate heat exchanger has an easy-to-clean structure and is equipped with a drain outlet for cleaning internal dust and debris.
[0014] Furthermore, the atomizer inside the spray unit efficiently atomizes the incoming material, ensuring full contact and heat exchange with the hot air.
[0015] Furthermore, the spray dust collection device has a highly efficient gas-solid separation structure, ensuring the recovery of powder and the smooth discharge of gas.
[0016] Furthermore, the RTO furnace adopts a regenerative heat exchange structure, which can effectively recover the heat of the waste gas for preheating the waste gas to be treated, thereby improving energy utilization. Moreover, its efficiency in oxidizing and decomposing VOCs meets the industry's waste gas treatment emission standards.
[0017] The beneficial effects of this utility model of a positive electrode material combined heat exchange device are:
[0018] 1. High-efficiency energy utilization: Indirect heat exchange between the high-temperature exhaust gas of the RTO furnace and the inlet air of the spray drying is achieved through plate heat exchangers, so that the inlet air is preheated before entering the spray hot air furnace, which significantly reduces the energy consumption of natural gas and other energy in the hot air furnace, fully recovers the waste heat of the originally discarded exhaust gas, improves the heat utilization rate of the cathode material production process, and reduces the energy consumption per unit product.
[0019] 2. Precise cost control: On the one hand, reduced energy consumption directly reduces production costs; on the other hand, the equipment process is simple, requiring no excessive investment in equipment, and energy waste is reduced through waste heat recovery. Long-term operation can effectively compress the overall cost of lithium iron phosphate production and enhance the product's market competitiveness.
[0020] 3. Environmental protection and production synergy: The RTO furnace effectively treats the organic waste gas generated by the roller kiln, oxidizes and decomposes VOCs, reduces pollutant emissions, and meets environmental protection requirements; at the same time, waste heat recovery and utilization achieve the synergistic promotion of environmental protection goals and energy saving and cost reduction, helping enterprises to achieve green and sustainable production.
[0021] 4. Convenient operation and maintenance: The plate heat exchanger adopts an easy-to-clean structure and is equipped with a drain outlet for easy cleaning of internal dust, reducing the risk of equipment failure caused by the accumulation of impurities, reducing the difficulty and cost of operation and maintenance, ensuring long-term stable operation of the unit, and improving production continuity and reliability. Attached Figure Description
[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0023] Figure 1 This is a schematic diagram of the structure of this utility model.
[0024] In the diagram: 1. Spray main unit, 2. Spray dust removal and material collection device, 3. Spray induced draft device, 4. Roller kiln, 5. RTO furnace, 6. Plate heat exchanger, 7. Spray blower, 8. Spray hot air furnace, 9. Exhaust device. Detailed Implementation
[0025] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.
[0026] The combined heat exchange device for this positive electrode material, as shown in the figure, consists of a spray host 1, a spray dust removal and material collection device 2, a spray induced draft device 3, a roller kiln 4, an RTO furnace 5, a plate heat exchanger 6, a spray blower 7, a spray hot air furnace 8, and an exhaust device 9. Each component is connected via ductwork and conveying equipment according to the production process and heat recovery requirements, forming a complete closed loop for material handling and waste heat recovery.
[0027] The workflow is as follows:
[0028] The material is conveyed to the spray host 1, where it is atomized by the atomizer above the host, forming fine droplets. Simultaneously, the air introduced by the spray blower 7 first undergoes indirect heat exchange with the high-temperature exhaust gas from the RTO furnace 5 via the plate heat exchanger 6, raising its temperature before entering the spray hot air furnace 8 for further heating, becoming high-temperature hot air. The atomized material droplets and the high-temperature hot air rapidly contact and exchange heat within the spray host 1, causing moisture to evaporate and the material to dry into fine powder.
[0029] Powder collection and preliminary exhaust gas treatment: After drying, the powder enters the spray dust collection device 2 with hot air. With the help of the gas-solid separation function of the device (such as cyclone separation, bag filter, etc.), the powder and gas are separated. The powder falls into the collection port and is then transported to the roller kiln 4 for high-temperature calcination. The separated gas is guided to the air by the spray exhaust device 3.
[0030] The powder undergoes a high-temperature roasting reaction in the roller kiln 4, generating waste gas containing a large amount of organic matter, which is then transported to the RTO furnace 5 through a duct. The RTO furnace 5, as a regenerative thermal incinerator, utilizes the heat storage medium to absorb heat and heat the organic waste gas to above 760°C, thereby fully oxidizing and decomposing the VOCs (volatile organic compounds) in the waste gas into carbon dioxide and water, thus achieving waste gas purification.
[0031] After treatment in RTO furnace 5, the exhaust gas still maintains a high temperature, but due to the presence of impurities (such as dust), it cannot be directly used in the spray drying system. Therefore, the high-temperature exhaust gas first enters plate heat exchanger 6, where it undergoes indirect heat exchange with the flash air introduced by spray blower 7. The temperature of the air increases as it absorbs heat, while the temperature of the exhaust gas decreases as it releases heat. The heat-exchanged air then enters spray hot air furnace 8, reducing the consumption of energy such as natural gas; the heat-exchanged exhaust gas is then safely discharged through exhaust device 9.
[0032] Considering that the incoming exhaust gas contains dust and soot, an easy-to-clean structural design is adopted, with a drain outlet installed at a suitable location on the heat exchanger shell. Cleaning media (such as water) can be periodically introduced through the drain outlet to flush the internal heat exchange plates and flow channels, removing dust buildup, ensuring heat exchange efficiency, and preventing heat transfer from being affected by impurities clogging the system.
[0033] The system adopts a multi-bed regenerative thermal structure, with a reasonable design of the regenerative material (such as ceramic regenerative material) and its arrangement to ensure efficient recovery of waste gas heat. At the same time, it precisely controls parameters such as furnace temperature and airflow velocity to ensure the VOC oxidation and decomposition effect and meet environmental emission requirements.
[0034] The atomizer of the spray host 1 uses high-efficiency atomizing components (such as centrifugal atomizers, pressure atomizers, etc.), and optimizes parameters such as atomizer speed and pressure to ensure that the material is fully atomized and improve the heat exchange efficiency with hot air; the spray dust removal and material collection device 2 selects appropriate gas-solid separation equipment according to the processing volume and separation accuracy requirements, such as a high-efficiency cyclone separator paired with a bag dust collector to ensure the powder recovery rate and the cleanliness of gas emissions.
[0035] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A positive electrode material combined heat exchange device, characterized in that: It includes a spray hot air furnace (8), a spray host (1), a spray dust removal and material collection device (2), a roller kiln (4), and an RTO furnace (5) connected in sequence. The spray host (1) is used to receive materials and atomize them through the atomizer above, so as to achieve preliminary heat exchange and drying of materials with hot air; The spray dust collection device (2) is used to separate the powder and gas after drying by the spray host (1). The powder is guided to the roller kiln (4), and the separated gas is discharged through the spray exhaust device (3). The roller kiln (4) is used to roast the powder at high temperature, and the waste gas containing organic matter is directed to the RTO furnace (5). The RTO furnace (5) is used to heat organic waste gas to above 760°C to oxidize and decompose VOCs, and the treated high-temperature waste gas is guided to a plate heat exchanger (6). The plate heat exchanger (6) is used to achieve indirect heat exchange between the high-temperature exhaust gas discharged from the RTO furnace (5) and the flash evaporation air inlet. After the flash evaporation air inlet is heat-exchanged, it is guided to the spray hot air furnace (8). The spray hot air furnace (8) is used to further heat the incoming air after it has been heated by the plate heat exchanger (6).
2. The positive electrode material combined heat exchange device according to claim 1, characterized in that: The plate heat exchanger (6) is equipped with a spray blower (7) and an exhaust device (9). The spray blower (7) is used to provide air intake for the spray system, and the exhaust device (9) is used to guide the exhaust gas of the plate heat exchanger (6) after heat exchange to be discharged.
3. The positive electrode material combined heat exchange device according to claim 1, characterized in that: The plate heat exchanger (6) has an easy-to-clean structure and is equipped with a drain outlet for cleaning internal dust and fumes.
4. The positive electrode material combined heat exchange device according to claim 1, characterized in that: The atomizer inside the spray host (1) efficiently atomizes the incoming material, ensuring full contact and heat exchange with the hot air.
5. The positive electrode material combined heat exchange device according to claim 1, characterized in that: The spray dust collection device (2) has a high-efficiency gas-solid separation structure to ensure the recovery of powder and smooth exhaust of gas.
6. The positive electrode material combined heat exchange device according to claim 1, characterized in that: The RTO furnace (5) adopts a regenerative heat exchange structure, which can effectively recover the heat of the waste gas for preheating the waste gas to be treated, improve the energy utilization rate, and its efficiency in oxidizing and decomposing VOCs meets the industry's waste gas treatment emission standards.