Polymerizing kettle stirrer power supply or energy storage system and method using waste heat

Abstract

The invention discloses a polymeric kettle stirrer power supply or energy storage system and method utilizing waste heat, and belongs to the technical field of energy recycling, the system comprises a waste heat conversion module, the energy output end of the waste heat conversion module is connected with the input end of an energy storage module and the input end of a stirring driving module, and the stirring driving module is connected with the energy storage module. The output end of the energy storage module is connected with the input end of the stirring driving module, and the output end of the stirring driving module is in transmission connection with a polymerization kettle stirrer; the waste heat conversion module is used for converting waste heat into mechanical energy and amplifying the output acting force converted from the mechanical energy; the energy storage module is used for storing energy output by the waste heat conversion module; and the stirring driving module is used for receiving the amplified acting force output by the waste heat conversion module or the stored energy output by the energy storage module and driving a stirrer in the polymerization kettle to operate. Effective conversion of waste heat and recovery of tail gas moisture can be achieved, the resource utilization rate is increased, and accident load investment of the stirrer is reduced.

Description

Technical Field

[0001] This invention relates to the field of energy recovery and utilization technology, specifically to a power supply or energy storage system and method for a polymerization reactor agitator that utilizes waste heat. Background Technology

[0002] After production, polymer products typically undergo hot air drying before being packaged and sold. During the drying process, the exhaust gas released into the atmosphere retains a relatively high residual temperature and contains approximately 10% moisture. Due to the low thermal energy level of this exhaust gas, most manufacturers do not recover and utilize its heat, generally opting for direct discharge after water washing and dust removal. This process results in a significant waste of both heat energy and water resources.

[0003] Meanwhile, polymerization reactions are mostly exothermic. As the reaction continues, the viscosity of the material inside the polymerization reactor gradually increases, and the agitator in the reactor typically has a high power rating. During the polymerization process, if a power outage occurs, the operation of the agitator and the supply of circulating water cannot be maintained normally, leading to uneven heat transfer and poor heat dissipation within the reactor. This causes a rapid increase in temperature and pressure within the reactor, creating uncontrollable safety hazards. Crucially, many of the raw materials involved in the polymerization reaction, such as olefins and vinyl chloride, are flammable and explosive substances. High instantaneous flow rates can easily generate static electricity, further increasing the risk of explosion.

[0004] Based on the aforementioned safety requirements, the power supply for polymerization mixing systems typically employs a redundant configuration of normal dual power supplies and an emergency power supply. When both normal power supplies fail simultaneously, the distribution cabinet will automatically switch to the emergency power supply after a delay of several seconds, providing power support for emergency handling of the polymerization reaction.

[0005] With the increasing trend of larger polymerization reactors in the chemical industry, the power of the accompanying agitators is also constantly increasing. This necessitates the use of high-voltage emergency generators as the emergency power supply. This configuration not only has high initial investment costs but also places more stringent requirements on the performance of the electrical protection system and the standards of daily maintenance. However, from the perspective of practical application needs, the core function of the emergency power supply is to drive the agitator to evenly disperse the emergency terminating agent into the material inside the reactor when the normal power supply is interrupted, thereby achieving timely termination of the polymerization reaction. At the same time, it needs to maintain continuous stirring for a period of time to prevent the slurry in the reactor from settling and ensure the safe shutdown of the system. In this process, the speed required by the agitator is much lower than the operating speed during the normal reaction stage. The actual load requirement of the emergency power supply is not high. The current configuration of using high-voltage emergency generators is mismatched with the actual load requirements, resulting in significant resource waste.

[0006] In summary, existing polymerization production processes suffer from both the problem of ineffective recovery of waste heat from the drying process and water resources, and the technical pain points of redundant emergency power supply configuration and low resource utilization in the polymerization reactor stirring system. There is an urgent need for a technical solution that can balance waste heat recovery and utilization with reducing the cost of emergency power supply configuration. Summary of the Invention

[0007] To address the problems existing in the prior art, this invention provides a power supply or energy storage system and method for a polymerization reactor agitator utilizing waste heat. This aims to solve the problems of wasted heat and water resources caused by the direct emission of low-grade waste heat from the polymerization drying process in current polymerization production processes, as well as the redundancy in emergency power supply configuration, high investment and maintenance costs, and low resource utilization in polymerization reactor agitator systems. To achieve the above objectives, this invention provides the following technical solution: A power supply or energy storage system for a polymerization reactor agitator utilizing waste heat includes a waste heat conversion module, an energy storage module, and an agitation drive module. The energy output terminal of the waste heat conversion module is connected to the input terminal of the energy storage module and the input terminal of the stirring drive module, respectively. The output terminal of the energy storage module is connected to the input terminal of the stirring drive module, and the output terminal of the stirring drive module is connected to the stirrer in the polymerization reactor. The waste heat conversion module is used to convert waste heat into mechanical energy and amplify the external force of the mechanical energy conversion; the energy storage module is used to store the energy output by the waste heat conversion module; the stirring drive module is used to receive the amplified force output by the waste heat conversion module or the stored energy output by the energy storage module and drive the stirrer in the polymerization reactor to run.

[0008] Furthermore, the waste heat conversion module includes a heat exchanger, a multi-stage expander, and a hydraulic booster; the heat exchanger is provided with a tail gas inlet for introducing the tail gas from the drying process; the heat exchanger has a medium channel to allow the intermediate medium to circulate and absorb the waste heat transferred by the tail gas from the drying process; the air inlet of the multi-stage expander is connected to the medium outlet of the heat exchanger, receives the intermediate medium after it has absorbed heat from the heat exchanger, and expands the intermediate medium after it has absorbed heat to output mechanical energy; the output shaft of the multi-stage expander is connected to the hydraulic booster.

[0009] Furthermore, each stage of the multi-stage expander is provided with an interstage separator; the air inlet of the interstage separator is connected to the outlet of the previous stage expander, the gas phase outlet of the interstage separator is connected to the air inlet of the next stage expander, and the liquid phase outlet of the interstage separator is used to output the liquid generated during the expansion process of the heat-absorbing intermediate medium to the outside of the multi-stage expander.

[0010] Furthermore, the waste heat conversion module also includes a condenser and a liquid pressurizing pump; the air inlet of the condenser is connected to the final stage outlet of the multi-stage expander; the liquid phase outlet of the condenser and the liquid phase outlet of the interstage separator are both connected to the input port of the liquid pressurizing pump through pipelines; the output port of the liquid pressurizing pump is connected to the medium inlet of the heat exchanger.

[0011] Furthermore, a compressor is also provided between the multi-stage expander and the condenser.

[0012] Furthermore, the intermediate medium is an organic or inorganic working medium.

[0013] Furthermore, the energy storage module includes an energy accumulator, which is connected to the hydraulic booster.

[0014] Furthermore, it also includes a moisture separation and recovery module; the moisture recovery module includes at least a gas-liquid separator, the inlet of which is connected to the exhaust gas outlet of the waste heat conversion module for the exhaust gas output of the drying process, for separating the low-temperature exhaust gas and condensate water in the exhaust gas of the drying process after being cooled by the waste heat conversion module.

[0015] A method for powering or storing the agitator of a polymerization reactor using waste heat, employing the above-mentioned system, includes the following steps: S1, the exhaust gas from the drying process enters the waste heat conversion module, which recovers the waste heat in the exhaust gas from the drying process and converts it into mechanical energy, and amplifies the external force of the mechanical energy conversion. S2, the energy storage module stores the energy output by the waste heat conversion module; the stirring drive module receives the energy released by the energy storage module in the event of a power outage so that the stirrer can continue to operate according to the preset parameters in the event of a power outage; Alternatively, once the energy storage is saturated, the stirring drive module can directly receive the amplified force output from the waste heat conversion module to drive the stirrer inside the polymerization reactor to operate normally.

[0016] Furthermore, the preset parameters for the power outage condition are a running time of 15 to 30 minutes and a rotation speed of 1 / 4 to 1 / 2 of the rotation speed during the normal operation of the polymerization reaction.

[0017] The beneficial effects of this invention are: This invention discloses a power supply or energy storage system and method for a polymerization reactor agitator utilizing waste heat. The system includes a waste heat conversion module, an energy storage module, and a stirring drive module. The waste heat conversion module recovers idle low-grade waste heat from the drying process tail gas and converts it into mechanical energy, providing power to the polymerization reactor agitator. This effectively reduces electricity consumption costs during polymerization production and minimizes energy and water waste caused by direct waste heat emissions. Furthermore, the cooled tail gas subsequently enters a water scrubbing tower for treatment. Due to the reduced temperature, the amount of water vapor carried away after scrubbing is significantly less than before cooling, further reducing water loss and improving overall energy utilization. Simultaneously, the energy storage module also functions as an energy storage unit. Under normal operating conditions, the waste heat conversion module can drive the agitator. In the event of a power outage, it can quickly release stored energy to maintain agitator operation, eliminating the need for redundant high-voltage emergency power supplies. This avoids safety hazards such as slurry settling and reaction runaway caused by power outages, ensuring continuous and stable production and reducing safety risks. Attached Figure Description

[0018] Figure 1 A block diagram of a power supply or energy storage system for a polymerization reactor agitator utilizing waste heat, provided by the present invention; Figure 2 This invention provides a schematic diagram of a method for power supply or energy storage of a polymerization reactor agitator using waste heat.

[0019] The attached figures are labeled as follows: 1. Heat exchanger; 2. Multistage expander; 3. Hydraulic booster; 4. Condenser; 5. Liquid pressurization pump; 6. Accumulator; 7. Compressor; 8. Gas-liquid separator; 9. Agitator; 10. Polymerization reactor. Detailed Implementation

[0020] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore merely examples and should not be used to limit the scope of protection of the present invention. Those skilled in the art should understand that the present invention can be implemented even without certain specific details. In some other embodiments, methods, means, equipment, and steps well known to those skilled in the art are not described in detail in order to highlight the spirit of the present invention.

[0021] Unless otherwise specified, in this invention, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," "x-direction," "y-direction," and "z-direction" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this invention are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0022] Example 1 See attached Figure 1-2 This embodiment provides a power supply or energy storage system for a polymerization reactor agitator that utilizes waste heat, such as... Figure 1 As shown, it includes a waste heat conversion module, an energy storage module, and a stirring drive module. The specific connection methods of each module are as follows: The waste heat conversion module is used to recover waste heat from the tail gas of the drying process and convert it into mechanical energy, while amplifying the external force of the mechanical energy conversion. The waste heat conversion module includes a heat exchanger 1, a multi-stage expander 2, and a hydraulic booster 3. The heat exchanger 1 can be a shell-and-tube heat exchanger. The tail gas inlet of the heat exchanger 1 is connected to the high-temperature tail gas pipeline discharged from the polymerization drying process to receive the tail gas. The heat exchanger 1 has a medium channel to allow the intermediate medium to circulate and absorb the waste heat transferred from the tail gas of the drying process. The medium channel of the heat exchanger 1 is connected to the intermediate medium pipeline. The intermediate medium can be an organic working fluid, such as a hydrocarbon organic working fluid like propane; it can also be a fluorinated or halogenated hydrocarbon organic working fluid, such as Freon; or it can be an inorganic working fluid, such as carbon dioxide, to adapt to the low-grade waste heat in the temperature range of the tail gas of the drying process, resulting in high gasification efficiency.

[0023] The multi-stage expander 2 can be a three-stage gas expander. The inlet of the multi-stage expander 2 is connected to the medium outlet of the heat exchanger 1 through a pipeline to receive the high-pressure gaseous intermediate medium after it has been vaporized by the heat exchanger 1. An interstage separator is installed between each stage of the multi-stage expander 2. The interstage separator can be a vertical separator. The inlet of the interstage separator is connected to the outlet of the previous stage expander, and the gas phase outlet is connected to the inlet of the next stage expander. The liquid phase outlet of the interstage separator is used to output the liquid generated during the expansion of the gaseous intermediate medium to the outside of the multi-stage expander 2, so as to realize the timely separation of the liquid intermediate medium generated during the expansion process, reduce the water hammer damage to the next stage, maximize the work done during expansion, and reduce the heat exchange of the gas at the outlet of the last stage.

[0024] The output shaft of the multi-stage expander 2 is connected to the hydraulic booster 3. The multi-stage expander 2 expands through the intermediate medium to drive the impeller to rotate and output mechanical energy. This mechanical energy is transmitted to the hydraulic booster 3, which converts the mechanical energy into hydraulic pressure and amplifies the output force. This process is accompanied by a small amount of active power loss. The amplified hydraulic force can be directly output to the stirring drive module or sent to the energy storage module for storage.

[0025] The waste heat conversion module also includes a condenser 4 and a liquid pressurization pump 5. The inlet of the condenser 4 is connected to the outlet of the final stage of the multi-stage expander 2, used to condense the gaseous intermediate medium after work into a liquid state. The liquid phase outlet of the condenser 4 is connected to the input end of the liquid pressurization pump 5 through a pipeline. At the same time, the liquid phase outlets of the interstage separators of each stage are also connected to the input end of the liquid pressurization pump 5 through a connecting pipeline. The output end of the liquid pressurization pump 5 is connected to the medium inlet of the heat exchanger 1 through a high-pressure pipeline, pressurizing the liquid intermediate medium and sending it into the heat exchanger 1 for reheat absorption and vaporization, forming a complete closed loop of intermediate medium circulation. The condenser 4 can be a shell-and-tube condenser, and the liquid pressurization pump 5 can be a screw-type liquid pressurization pump. A compressor 7 is also provided between the multistage expander 2 and the condenser 4. The compressor 7 is used to increase the pressure of the intermediate medium at the final outlet of the multistage expander 2. By increasing the final outlet pressure of the multistage expander 2, it is ensured that the intermediate medium can smoothly enter the condenser and condense into liquid without the need for a subcooling source, thereby improving the condensing efficiency and the circulation stability of the entire system.

[0026] The energy storage module stores the energy output from the waste heat conversion module. Specifically, the energy storage module includes an accumulator 6. The output of the hydraulic booster 3 can be connected to the inlet of the accumulator 6 via a high-pressure hydraulic pipeline. The stirring drive module can receive the energy released by the energy storage module during a power outage to maintain the agitator's operation according to preset parameters under power outage conditions. Simultaneously, the hydraulic booster 3 also has a bypass output pipeline connected to the stirring drive module. This allows the stirring drive module to directly receive the amplified force output from the waste heat conversion module to drive the agitator in the polymerization reactor to operate normally after the accumulator 6 is saturated with energy. The accumulator 6 can be a bladder-type accumulator.

[0027] The stirring drive module receives the amplified force from the waste heat conversion module or the stored energy from the energy storage module to drive the stirrer inside the polymerization reactor. Specifically, the stirring drive module may include a hydraulic motor and a gearbox. The input end of the hydraulic motor is connected via hydraulic lines to the outlet of the accumulator 6 and the bypass output line of the hydraulic booster 3. The output end of the hydraulic motor is connected to the input end of the gearbox, and the output end of the gearbox is connected to the main shaft of the stirrer 9 in the polymerization reactor 10, thus transmitting power to drive the stirrer 9. When the power supply is normal and the accumulator 6 is fully charged, the stirring drive module directly receives the amplified force from the hydraulic booster 3 to drive the stirrer 9. In the event of a power outage, it receives the energy released from the accumulator 6 to drive the stirrer 9 according to preset parameters for the power outage condition. The normal reaction speed of the stirrer 9 is 120 r / min, with an actual power consumption of 140-200 kW. During a power outage, the preset parameters can be set to a running time of 15-30 minutes and a speed of 1 / 3 of the normal reaction speed.

[0028] In one specific embodiment of this application, the power supply or energy storage system for the polymerization reactor agitator utilizing waste heat further includes a moisture separation and recovery module. The moisture separation and recovery module includes a gas-liquid separator 8. The inlet of the gas-liquid separator 8 is connected to the tail gas outlet of the heat exchanger 1 through a pipeline. After the tail gas from the drying process enters the heat exchanger 1, it exchanges heat with the intermediate medium. The temperature of the tail gas from the drying process decreases, and the trace amount of moisture in it reaches saturation and condensate. After cooling, the low-temperature tail gas containing condensate enters the gas-liquid separator 8, where the low-temperature tail gas and condensate are separated. The separated low-temperature tail gas is sent to the subsequent tail gas washing process for treatment and is discharged after meeting the standards. Due to the decrease in temperature, the amount of water vapor carried away by the washing liquid is significantly reduced compared to before cooling, further reducing water resource loss. The separated condensate can be filtered and softened before being reused in the production water network or domestic water network, realizing the recycling of water resources.

[0029] Example 2 See attached Figure 1-2 Based on Example 1, such as Figure 2 As shown, this embodiment also provides a method for power supply or energy storage of a polymerization reactor agitator using waste heat. The specific steps for power supply or energy storage of the polymerization reactor agitator using the system in Embodiment 1 are as follows: S1, the exhaust gas from the drying process enters the waste heat conversion module. The waste heat conversion module recovers the waste heat from the exhaust gas and converts it into mechanical energy, amplifying the external force of the converted mechanical energy. Specifically, the exhaust gas generated in the polymerization drying process continuously enters heat exchanger 1. Through the heat exchanger 1, the waste heat in the exhaust gas from the drying process is transferred to the liquid intermediate medium in the medium channel. After absorbing heat, the liquid intermediate medium rapidly vaporizes to form a high-pressure gaseous intermediate medium. The gaseous intermediate medium enters the multi-stage expander 2, which expands and depressurizes stage by stage, driving the expander impeller to rotate at high speed, converting the internal energy of the intermediate medium into mechanical energy. The mechanical energy is transferred to the hydraulic booster 3, which converts the mechanical energy into hydraulic pressure and amplifies the external force, with a small amount of active power loss, completing the conversion of waste heat into amplified hydraulic force. In this process, the liquid intermediate medium generated during the two-stage expansion of the multi-stage expander 2 is separated by the interstage separators of each stage and then sent out of the multi-stage expander 2 to avoid water hammer damage to the next stage expander. The gaseous intermediate medium after the work done by the final stage expander enters the condenser 4 and is condensed into a liquid intermediate medium by the cooling medium. After merging with the liquid intermediate medium separated by the interstage separators of each stage, it is pressurized by the liquid pressurization pump 5 and sent back into the medium channel of the heat exchanger 1 to absorb heat and vaporize, thus completing the recycling of the intermediate medium.

[0030] S2, the energy storage module stores the energy output by the waste heat conversion module; the stirring drive module receives the energy released by the energy storage module during a power outage to keep the stirrer running according to the preset parameters under power outage conditions; or, after the energy storage is saturated, the stirring drive module directly receives the amplified force output by the waste heat conversion module to drive the stirrer in the polymerization reactor to operate normally. Specifically, the accumulator 6 of the energy storage module is connected to the hydraulic booster 3, receiving and storing the amplified hydraulic energy output by the hydraulic booster 3.

[0031] Operating Condition 1: When the accumulator 6 is saturated with energy, the stirring drive module directly receives the amplified hydraulic force output by the hydraulic booster 3, driving the stirrer 9 in the polymerization reactor 10 to operate at the speed of the normal polymerization reaction stage, realizing the direct utilization of waste heat and replacing the power supply to save electricity consumption.

[0032] Operating Condition 2: When a power outage occurs, the stirring drive module receives the stored energy released by the accumulator 6, enabling the stirrer 9 to maintain operation according to the preset parameters under the power outage condition, namely, a running time of 20 minutes and a speed maintained at 1 / 3 of the speed during the normal stage of the polymerization reaction, ensuring that the slurry in the polymerization reactor 10 does not settle, the emergency terminator is evenly dispersed, and the reaction is terminated smoothly.

[0033] After being cooled by heat exchanger 1, the exhaust gas from the drying process enters gas-liquid separator 8, where the condensate water is collected, treated by a purification device, and then reused. The cooled low-temperature exhaust gas then enters a water washing tower for further treatment. Due to the lower temperature, the amount of water vapor carried away by the washing process is significantly reduced compared to before cooling, further reducing water resource consumption.

[0034] This application achieves efficient recovery and utilization of waste heat from the tail gas of the polymerization drying process through the above-mentioned system and method. Under normal operating conditions, it can meet the power demand of the agitator 9 in the polymerization kettle 10, resulting in significant energy saving. Under power failure conditions, it can maintain the stable operation of the agitator 9 for a period of time without relying on the high-voltage emergency generator, effectively avoiding safety hazards. At the same time, it can recover water resources, and long-term operation can significantly reduce production and operating costs.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. A power supply or energy storage system for a polymerization reactor agitator utilizing waste heat, characterized in that, It includes a waste heat conversion module, an energy storage module, and a stirring drive module; The energy output terminal of the waste heat conversion module is connected to the input terminal of the energy storage module and the input terminal of the stirring drive module, respectively. The output terminal of the energy storage module is connected to the input terminal of the stirring drive module. The output terminal of the stirring drive module is connected to the stirrer (9) in the polymerization reactor (10). The waste heat conversion module is used to convert waste heat into mechanical energy and amplify the external force of the mechanical energy conversion; the energy storage module is used to store the energy output by the waste heat conversion module; the stirring drive module is used to receive the amplified force output by the waste heat conversion module or the stored energy output by the energy storage module and drive the stirrer (9) in the polymerization reactor (10) to run.

2. The waste heat-utilizing polymerization reactor agitator power supply or energy storage system according to claim 1, characterized in that, The waste heat conversion module includes a heat exchanger (1), a multi-stage expander (2), and a hydraulic booster (3); the heat exchanger (1) is provided with a tail gas inlet for introducing tail gas from the drying process; the heat exchanger (1) is provided with a medium channel to allow intermediate medium to circulate and absorb the waste heat transferred by the tail gas from the drying process; the air inlet of the multi-stage expander (2) is connected to the medium outlet of the heat exchanger (1), receives the intermediate medium after heat absorption by the heat exchanger (1), and outputs mechanical energy through the expansion of the heat-absorbing intermediate medium; the output shaft of the multi-stage expander (2) is connected to the hydraulic booster (3).

3. The waste heat-utilizing polymerization reactor agitator power supply or energy storage system according to claim 2, characterized in that, Each stage of the multi-stage expander (2) is provided with an interstage separator; the air inlet of the interstage separator is connected to the outlet of the previous stage expander, the gas phase outlet of the interstage separator is connected to the air inlet of the next stage expander, and the liquid phase outlet of the interstage separator is used to output the liquid generated during the expansion process of the heat-absorbing intermediate medium to the outside of the multi-stage expander (2).

4. The waste heat-utilizing polymerization reactor agitator power supply or energy storage system according to claim 3, characterized in that, The waste heat conversion module also includes a condenser (4) and a liquid pressurizing pump (5); the air inlet of the condenser (4) is connected to the final stage outlet of the multi-stage expander (2); the liquid phase outlet of the condenser (4) and the liquid phase outlet of the interstage separator are both connected to the input port of the liquid pressurizing pump (5) through pipelines; the output port of the liquid pressurizing pump (5) is connected to the medium inlet of the heat exchanger (1).

5. The waste heat-utilizing polymerization reactor agitator power supply or energy storage system according to claim 4, characterized in that, A compressor (7) is also provided between the multi-stage expander (2) and the condenser (4).

6. The waste heat-utilizing polymerization reactor agitator power supply or energy storage system according to claim 2, characterized in that, The intermediate medium is an organic or inorganic working medium.

7. The waste heat-utilizing polymerization reactor agitator power supply or energy storage system according to claim 2, characterized in that, The energy storage module includes an energy accumulator (6), which is connected to the hydraulic booster (3).

8. The power supply or energy storage system for the agitator of a polymerization reactor utilizing waste heat according to claim 1, characterized in that, It also includes a moisture separation and recovery module; the moisture separation and recovery module includes at least a gas-liquid separator (8), the inlet of which is connected to the outlet of the waste heat conversion module for the output of the tail gas of the drying process, and is used to separate the low-temperature tail gas and condensate water in the tail gas of the drying process after being cooled by the waste heat conversion module.

9. A method for powering or storing the agitator of a polymerization reactor using waste heat, characterized in that, The system described in any one of claims 1 to 8 includes the following steps: S1, the exhaust gas from the drying process enters the waste heat conversion module, which recovers the waste heat in the exhaust gas from the drying process and converts it into mechanical energy, and amplifies the external force of the mechanical energy conversion. S2, the energy storage module stores the energy output by the waste heat conversion module; the stirring drive module receives the energy released by the energy storage module in the event of a power outage so that the stirrer (9) can maintain operation according to the preset parameters in the event of a power outage; Alternatively, after the energy storage is saturated, the stirring drive module directly receives the amplified force output by the waste heat conversion module to drive the stirrer (9) in the polymerization reactor (10) to operate normally.

10. A method for power supply or energy storage of a polymerization reactor agitator utilizing waste heat according to claim 9, characterized in that, The preset parameters for the power outage condition are a running time of 15 to 30 minutes and a rotation speed of 1 / 4 to 1 / 2 of the rotation speed during the normal operation of the polymerization reaction.

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