Magnetic suspension-based CO2 residual pressure generator set, system and method

Abstract

The invention discloses a magnetic suspension-based CO2 excess pressure generator set, system and method, the magnetic suspension-based CO2 excess pressure generator set comprises a CO2 gas pipeline assembly, a heater, a magnetic suspension ORC power generation all-in-one machine and a magnetic bearing control cabinet, the axial and radial gaps of a rotor main shaft are monitored in real time through a sensor, and the coil current of the magnetic bearing assembly is adjusted based on a PID algorithm to stabilize the rotor suspension attitude. According to the CO2 tail gas power generation device, residual pressure of CO2 tail gas is utilized for power generation, mechanical energy is converted into electric energy, the electric energy can be introduced into a living quarter after being rectified and inverted, and daily required electric energy is provided for the living quarter. And after being subjected to pressure expansion and speed reduction through an exhaust pipe, the impeller is discharged to an air outlet pipe, and then is discharged to a washing tower through a pipeline to be washed and then is emptied.

Description

Technical Field

[0001] The present invention relates to the field of CO 2 pressure residual power generation, and particularly to a CO 2 pressure residual power generation unit, system and method based on magnetic levitation. Background Art

[0002] In various chemical enterprises, the low-pressure CO 2 gas produced in the process section usually enters the tail gas water washing tower after recovering the cold energy through a heat exchanger, and is washed with demineralized water and then discharged. This treatment method not only exacerbates the greenhouse effect but also causes waste of resources. To solve this problem, the present invention proposes a new solution, using hot water at 100°C as a heat source to first heat the CO 2 tail gas, and then driving a magnetic levitation ORC integrated machine to generate electricity. The tail gas after doing work is washed by the tail gas water washing tower and then discharged.

[0003] Currently, there are already some technical solutions for CO 2 pressure residual power generation. For example, the Chinese invention patent with the publication number CN119163488A discloses a system and method for comprehensive utilization of carbon dioxide pressure residual. However, the system structure of this patent is complex, including components such as a turbine expander, a speed reducer, and a generator, with high maintenance costs. Moreover, due to the large number of auxiliary machines, the supporting lubrication system will also increase the upfront investment cost. Therefore, this unit is not suitable for most small chemical enterprises. Summary of the Invention

[0004] The purpose of the present invention is to provide a CO 2 pressure residual power generation unit, system and method based on magnetic levitation, so as to solve the foregoing problems existing in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A magnetic levitation CO 2 pressure residual power generation unit, including a CO 2 gas pipeline assembly; including an inlet steam pipeline, an inlet heater pipeline, an inlet magnetic levitation ORC power generation integrated machine pipeline, pipeline valves and an exhaust steam pipeline, the CO 2 gas pipeline assembly is used to transport CO 2 gas; A heater, including a cylinder body, heat exchange tubes, tube sheets and baffle plates, the CO 2 gas flowing in the heat exchange tubes exchanges heat with the hot water outside the cylinder body; A magnetic levitation ORC power generation integrated machine, including a volute assembly, a rotor main shaft, an impeller, a magnetic bearing assembly and a stator coil, the impeller is affected by CO 2The gas drives the rotation, the magnetic bearing assembly supports the rotor main shaft through electromagnetic force, and the stator coil cooperates with the motor coil assembly of the rotor main shaft to realize the conversion of mechanical energy into electrical energy; The magnetic bearing control cabinet monitors the axial and radial clearances of the rotor main shaft in real time through sensors, and adjusts the coil current of the magnetic bearing assembly based on the PID algorithm to stabilize the rotor suspension posture.

[0006] Preferably, a tapered nozzle flow channel is provided in the volute assembly for transferring CO 2 The pressure energy of the gas is converted into kinetic energy to drive the impeller to rotate.

[0007] Preferably, the magnetic bearing assembly includes a front radial bearing assembly, a rear radial bearing assembly and a thrust plate, and the thrust plate is fixedly connected to the rotor main shaft to balance the axial force.

[0008] Preferably, a flow regulating valve is provided on the steam inlet pipe of the heater to control the CO 2 Gas flow rate.

[0009] Preferably, the exhaust pipe is connected to the tail gas recovery device of the chemical production system to recover the CO 2 Gas recycling.

[0010] In another embodiment, a magnetically suspended CO 2 The residual pressure power generation system includes a generator set and a bypass valve, which is connected in parallel to the pipeline of the magnetic suspension ORC power generation integrated machine to adjust the CO 2 Gas flow to maintain stable power generation; The wiring compartment assembly has a built-in rectifier module, inverter module and transformer module, which are used to convert electrical energy and transmit it to the power grid or load equipment.

[0011] Preferably, the control signal of the bypass valve is linked with the sensor data of the magnetic bearing control cabinet to achieve coordinated regulation of the power generation power and the rotor suspension posture.

[0012] Preferably, the system also includes a remote monitoring terminal for real-time display of power generation, CO 2 Flow rate and magnetic bearing clearance data, and supports remote adjustment of parameters.

[0013] In yet another embodiment, a magnetically suspended CO 2 The residual pressure power generation method comprises the following steps: S1. Guide CO through the pipeline assembly 2 The gas flows through the steam inlet pipe, the heater and the magnetic suspension ORC generator in sequence; S2. In the heater, the hot water outside the cylinder is used to heat the CO flowing through the heat exchange tube. 2 Gas heat exchange to increase CO 2The temperature of the gas; S3. Feed the heated CO 2 gas into the volute assembly of the maglev ORC power generation integrated machine, and convert the pressure energy of the CO 2 gas into kinetic energy through the converging nozzle flow channel to drive the impeller to rotate; S4. Use the electromagnetic force generated by the magnetic bearing assembly to magnetically levitate and support the rotor main shaft, and real-time monitor the axial and radial clearances of the rotor main shaft. Adjust the current of the magnetic bearing coil based on the PID algorithm to maintain the stable suspension posture of the rotor; S5. Through the electromagnetic induction between the motor coil assembly on the rotor main shaft and the stator coil, convert the mechanical energy of the impeller into electrical energy; S6. Feed the CO 2 gas after power generation through the exhaust pipe to the tail gas recovery device for recycling; S7. Real-time collect the power generation power, CO 2 flow rate and magnetic bearing clearance data through the remote monitoring terminal, and remotely adjust the PID parameters of the magnetic bearing control cabinet or the opening degree of the bypass valve.

[0014] Preferably, in step S2, the flow rate of the CO 2 gas entering the heater is adjusted by the flow regulating valve arranged on the inlet heater pipe to match the heat exchange efficiency requirement; In step S3, by adjusting the opening degree of the bypass valve on the pipe entering the maglev ORC power generation integrated machine, control the flow rate of the CO 2 gas entering the volute assembly to maintain the stability of the power generation power; In step S4, the suspension position of the rotor main shaft is jointly regulated by the front radial bearing assembly, the rear radial bearing assembly and the thrust disc. The thrust disc is used to offset the axial force generated when the CO 2 gas drives the impeller; In step S6, the CO 2 gas after power generation returns to the chemical production system through the exhaust pipe and is used to participate in subsequent chemical reactions or for compression and storage.

[0015] The beneficial effects of the present invention are: The present invention discloses a maglev-based CO 2 residual pressure generating set, system and method, including a CO 2 gas pipeline assembly; including an inlet steam pipe, an inlet heater pipe, an inlet maglev ORC power generation integrated machine pipe, a pipeline valve and an exhaust pipe, and the CO 2 gas pipeline assembly is used to transport CO 2 gas; a heater, including a cylinder body, heat exchange tubes, tube sheets and baffle plates, and the CO 2The gas exchanges heat with the hot water outside the cylinder; the magnetic levitation ORC power generation integrated machine includes a volute component, a rotor main shaft, an impeller, a magnetic bearing component, and a stator coil. The impeller is driven to rotate by CO 2 gas, the magnetic bearing component suspends and supports the rotor main shaft through electromagnetic force, and the stator coil cooperates with the motor coil component of the rotor main shaft to realize the conversion of mechanical energy into electrical energy; the magnetic bearing control cabinet monitors the axial and radial clearances of the rotor main shaft in real time through sensors, and adjusts the coil current of the magnetic bearing component based on the PID algorithm to stabilize the rotor suspension attitude. The present invention has the following beneficial effects: (1) The present invention utilizes the residual pressure of CO 2 tail gas for power generation, converts mechanical energy into electrical energy, and after rectification and inversion, the electrical energy can be introduced into the living area to provide the daily required electrical energy for the living area.

[0016] (2) When facing the increase of the pressure, flow rate, and temperature parameters of the incoming gas, part of the tail gas can be released through the bypass valve to ensure that the power generation power of the magnetic levitation ORC power generation integrated machine does not exceed the critical value.

[0017] (3) When facing the decrease of the pressure, flow rate, and temperature parameters of the incoming gas, the magnetic levitation ORC power generation integrated machine can be adjusted accordingly to reduce the power generation amount, and it will not affect the main body of the unit. If the parameters are too low and cannot reach the set range value, the intake valve needs to be closed to stop the machine to ensure the safety of the unit.

[0018] (4) The present invention reduces components such as the oil station, speed reducer, generator, and oil lubrication pipeline used in the traditional turbine, and the electrical energy can be directly transported to the living area for use through the main engine junction box.

[0019] (5) The structure of the present invention is simple, adopting the upper-inlet and axial-exhaust method. After the CO 2 tail gas is heated and the pressure is reduced, it enters the volute through the air inlet, and then acts on the rotor impeller after the pressure is reduced and the speed is increased according to the nozzle flow channel, causing the impeller to rotate. After that, it is discharged to the exhaust pipe through pressure reduction and speed reduction, and then discharged to the outlet pipe through the pipeline, and then discharged to the scrubber for scrubbing and then emptied. Description of the Drawings

[0020] Figure 1 is the unit layout diagram of the present invention; Figure 2 is the schematic diagram of the rotor structure of the magnetic levitation ORC integrated machine of the present invention; Figure 3 is the schematic diagram of the structure of the magnetic levitation ORC integrated machine of the present invention; Figure 4 is the magnetic levitation CO 2 residual pressure power generation system operation diagram of the present invention; Figure 5 is the magnetic levitation CO 2 residual pressure power generation method flow chart of the present invention.

[0021] In the figure, 1 is the rotor main shaft; 2 is the motor coil assembly; 3 is the motor coil gland; 4 is the front radial bearing assembly; 5 is the rear radial bearing assembly; 6 is the thrust disk; 7 is the thrust disk gland; 8 is the rear gland screw; 9 is the impeller; 10 is the front gland; 11 is the front gland screw; 12 is the stator housing assembly; 13 is the intake port reverse flange; 14 is the exhaust assembly; 15 is the diffuser pipe; 16 is the magnetic bearing junction box; 17 is the base frame; 18 is the base; 19 is the working medium cooling exhaust flange; 20 is the volute assembly; 21 is the working medium discharge pipe; 22 is the cooling water discharge pipe; 23 is the outlet connection screw; 24 is the stator housing connection screw; 25 is the base frame connection screw; 26 is the volute connection screw; 27 is the intake port connection screw assembly; 28 is the hot water outlet heater; 29 is the hot water inlet heater; 30 is the CO 2 inlet heater; 31 is the heater; 32 is the No. 2 pneumatic valve; 33 is the No. 1 pneumatic valve; 34 is the magnetic levitation ORC power generation integrated machine; 35 is the washing and evacuation; 36 is the magnetic bearing control cabinet. Specific implementation mode

[0022] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific implementation mode described herein is only used to explain the present invention and is not used to limit the present invention.

[0023] Refer to Figures 1 to 5 A magnetic levitation CO 2 pressure recovery power generation unit shown, including a CO 2 gas pipeline assembly. The CO 2 gas pipeline assembly includes a steam inlet pipeline, an inlet heater pipeline, a pipeline for entering the magnetic levitation ORC power generation integrated machine, pipeline valves and an exhaust pipeline. The CO 2 gas pipeline assembly is used to transport CO 2 gas. Here, the CO 2 tail gas enters the heater 31 from other process sections through the transport pipeline.

[0024] It should be noted here that: the steam inlet pipeline is made of 316L stainless steel, with a pressure resistance of 1.6 MPa, and the inner wall is sprayed with a polytetrafluoroethylene anti-corrosion layer; the pipeline for entering the heater 31 is provided with a double-layer heat insulation layer (aluminum silicate fiber + stainless steel outer cover) to reduce heat loss; the pipeline for entering the magnetic levitation ORC power generation integrated machine is connected through a DN200 flange, with a design pressure of 1.0 MPa; ‌Pipeline valves‌: Pneumatic control valves (accuracy ±1%), supporting remote opening control.

[0025] ‌CO 2 function of the gas pipeline assembly‌: Transport CO 2Tail gas is processed and the flow rate is regulated to ensure the stability of the system pressure (0.15 - 0.3 MPa).

[0026] The heater 31 includes a cylinder body, heat exchange tubes, tube sheets and baffle plates. The CO flowing inside the heat exchange tubes 2 gas exchanges heat with the hot water outside the cylinder body. The heater 31 also includes a head. The hot water enters the heater 31 through the hot water inlet heater 29 and is distributed inside the cylinder body outside the heating tubes. The CO 2 passes through the CO 2 inlet heater 30, flows through the heat exchange tubes inside the heater 31, and exchanges heat with the hot water outside the heat exchange tubes, thus completing the heat exchange. The temperature of the hot water after heat exchange decreases and is transported to other process sections through a condensate pump. The CO inside the heat exchange tubes 2 will have its pressure reduced by 5 - 10 kPa after being heated, and then enter the magnetic levitation ORC power generation integrated machine for power generation by doing work.

[0027] Cylinder body: with a diameter of 800 mm, made of SA - 516Gr.70, and a design pressure of 1.6 MPa; Heat exchange tubes: made of Hastelloy C276, φ25×2 mm, arranged in a triangular pattern with a tube pitch of 32 mm; Tube sheet: with a thickness of 50 mm, connected to the heat exchange tubes by the strength welding + expansion joint process; Baffle plate: with a spacing of 150 mm, a segmental cut (25% cut - off rate), guiding the shell - side fluid to form turbulence.

[0028] In this embodiment, combined with Figure 4 it can be learned that the hot side of the heater is 0.45 MPa.G, 18 t / h of saturated steam condensate, and the CO 2 tail gas first passes through the CO 2 inlet heater 30, is heated to about 100 °C, enters the heat exchange tubes inside the heater 31 through the conveying pipeline. At the same time, the saturated steam condensate enters the cylinder body of the heater 31 through the pipeline and exchanges heat with the CO 2 tail gas inside the heat exchange tubes, then enters the magnetic levitation ORC power generation integrated machine 34 through the 2# pneumatic valve 32 and the 1# pneumatic valve 33 for power generation. The temperature of the exhaust steam at the outlet is 54 °C and is sent to the backend process for washing and evacuation 35.

[0029] The magnetic levitation ORC power generation integrated machine includes a volute component 20, a rotor main shaft 1, an impeller 9, a magnetic bearing component and a stator coil. The impeller 9 is driven to rotate by the CO 2 gas. The magnetic bearing component suspends and supports the rotor main shaft 1 through electromagnetic force. The stator coil cooperates with the motor coil component 2 of the rotor main shaft 1 to realize the conversion of mechanical energy to electrical energy. The magnetic levitation ORC power generation integrated machine also includes a main engine housing component, an exhaust component 14, a stator component, a rotor component, a conductive coil component, a magnetic bearing component, a mating flange component, a base frame component, and a wiring chamber component. The volute component 20 is installed on the main engine housing component. After the CO is heated and its pressure is reduced,2 Enter the volute assembly 20 through the pipeline, CO 2 After passing through the nozzle flow path, the pressure is reduced and the speed is increased, so as to blow and rotate the impeller 9, CO 2 The pressure is further reduced and the speed is decreased in the impeller 9.

[0030] The exhaust steam assembly 14 is connected to the volute by bolts, CO 2 After being further decelerated and pressurized by the exhaust steam assembly 14, it is discharged after being washed by the water scrubber.

[0031] The tapered nozzle flow path of the volute assembly 20: the throat diameter is 50 mm, the divergence angle is 12°, and the flow velocity is increased to 150 m / s; The impeller 9 is made of TC4 titanium alloy, with 8 blades, the diameter of the impeller 9 is 300 mm, and the dynamic balance grade is G2.5; The exhaust steam assembly 14: the diffuser 15 is designed (the diffusion angle is 8°), and the outlet pressure is restored to 0.1 MPa.

[0032] The front / rear radial bearings of the magnetic bearing assembly: the radial clearance is 0.2 mm, and the electromagnetic coil current is 0 - 20 A (PID control); The thrust disk: made of silicon carbide, the axial bearing capacity is ≥5 kN, balancing CO 2 The axial force generated by the airflow; The sensor: eddy current displacement sensor (accuracy ±1 μm), sampling frequency 10 kHz.

[0033] The conductive coil assembly includes: The stator coil: neodymium iron boron permanent magnet, the cross-sectional area of the copper winding is 10 mm², and the rated power is 200 kW; The rotor coil: a silver-plated conductor on the surface, generates electricity by coupling with the stator magnetic field, and the conversion efficiency is ≥95%.

[0034] Refer to Figure 4 , and in another embodiment, for example, the hot side of the heater 31 is 100 °C, and the steam condensate is 38 - 95 t / h, CO 2 The tail gas is first heated to about 79 °C by the heater 31, and then enters the magnetic levitation ORC power generation integrated machine 34 for power generation. The temperature of the exhaust steam outlet is 38 °C and is sent to the backend process for washing and discharging to 35. Regardless of which working condition is selected for the heat source, the design pressure and temperature of the preheater are designed according to the saturated steam condensate that meets 1.1 Mpa.

[0035] The operation mode of the unit will be described in detail below in combination with the above system embodiments.

[0036] It should be noted that in the following embodiments, the heat source inlet is used to replace the saturated steam condensate, and the heat source return is used to replace CO 2 The tail gas.

[0037] CO 2 The tail gas enters the heat exchange tubes inside the heater 31 through the conveying pipeline from other process sections. The heat source is distributed outside the heat exchange tubes and inside the cylinder body of the heater 31. CO 2 The tail gas flows through the heat exchange tubes inside the heater 31 and exchanges heat with the heat source outside the heat exchange tubes, thus completing the heat exchange. The temperature of the heat source after heat exchange decreases, and it flows through the hot water outlet heater 28 through the condensate pump and is transported to other process sections. CO inside the heat exchange tubes 2 After being heated, the pressure will decrease by 5 - 10 kPa, and thus it enters the magnetic levitation ORC power generation integrated machine. CO after being heated and the pressure reduced 2 It enters the volute component 20 through the pipeline. CO 2 It is decompressed and accelerated after flowing through the nozzle flow path, and thus blows to rotate the impeller 9. 2 It is further decompressed and decelerated in the impeller 9. The exhaust component 14 is connected to the volute component 20 by bolts. CO 2 It is decelerated and pressurized again through the exhaust component 14, and is discharged after being washed in the water washing tower. The core component of the magnetic levitation ORC power generation integrated machine is the rotor component, and the rotor component includes a rotor main shaft 1, a motor coil component 2, a motor coil gland 3, a front radial bearing component 4, a rear radial bearing component 5, a thrust disk 6, a thrust disk gland 7, a rear gland screw 8, an impeller 9, a front gland 10, and a front gland screw 11. Since the impeller 9 is assembled on the main shaft, when the air flow blows to rotate the impeller 9 through the nozzle, the impeller 9 drives the coaxial rotor to rotate. The front and rear magnetic bearings act as supports. Theoretically, the rotational speed of the magnetic bearings has no upper limit, and the rotational speed is determined by the rotational speed of the impeller 9. The rotor rotates continuously, thus driving the generator to do work and generate electricity.

[0038] The stator component is connected to the main engine housing component. The stator component includes a stator coil, a magnetic bearing mounting seat, a generator end cover component, etc. Its main function is to provide a fixed support for the generator and the rotor.

[0039] In this embodiment, the stator housing component 12 is connected to the volute component 20 by stator housing connection screws 24. The volute component 20 is connected to the intake port reverse flange 13 by an intake port connection screw assembly 27. The working medium steam source enters the volute component 20 from the pipeline through the intake port reverse flange 13. Due to the structural form of the volute, the steam source can directly impact on the impeller 9 on the rotor component. The impeller 9 is a rotating body. When the blades on the impeller 9 are subjected to the air flow force, they will rotate, driving the impeller 9 to rotate. The impeller 9 then drives the entire rotor to rotate. The rotor component is supported by the front radial bearing component 4 and the rear radial bearing component 5 inside the magnetic levitation ORC power generation integrated machine 34. The stator housing component 12 and the front radial bearing component 4, the rear radial bearing component 5 have an inherent magnetic field in the stable state. When the rotor rotates, the inherent magnetic field is changed, and the magnetic induction line cutting movement is carried out, thus generating an alternating electromotive force, forming an induced current, which is connected to the grid after rectification, inversion, and voltage transformation.

[0040] The exhaust component 14 and the diffuser pipe 15 are connected by an outlet connecting screw 23. The diffuser pipe 15 and the volute component 20 are connected by a volute connecting screw 26. The magnetic bearing junction box 16 is integrally cast with the stator housing component 12 and is connected to the external magnetic bearing control cabinet 36. The magnetic bearing control cabinet 36 controls the front radial bearing component 4 and the rear radial bearing component 5 through a program to control the attitude within the rotor stator housing component 12. The base frame 17 and the base 18 are connected by a base frame connecting screw 25. The working medium cooling exhaust flange 19, the working medium discharge pipe 21, and the cooling water discharge pipe 22 are welded to the stator housing component 12. The main function of the working medium discharge pipe 21 is to balance the pressure within the magnetic levitation ORC power generation integrated machine 34. The working medium cooling exhaust flange 19 is a preset exhaust pipe, and its main function is for draining liquid during the later upgrade of the working medium cooling. The function of the cooling water discharge pipe 22 is the same as that of the working medium cooling exhaust flange 19, and both are reserved for the later upgrade of the unit.

[0041] The rotor assembly includes a rotor main shaft 1, a motor coil assembly 2, a motor coil gland 3, a front radial bearing component 4, a rear radial bearing component 5, a thrust disk 6, a thrust disk gland 7, a rear gland screw 8, an impeller 9, a front gland 10, and a front gland screw 11. Since the impeller 9 is assembled on the rotor, when the air flow blows through the nozzle to rotate the impeller 9, the impeller 9 drives the coaxial rotor to rotate. The front and rear magnetic bearings act as supports. Theoretically, the magnetic bearings have no upper limit on the rotational speed, and the rotational speed is determined by the blowing rotation of the impeller 9. The rotor continuously rotates, thereby driving the generator to do work and generate electricity. The conductive coil assembly on the rotor generates a variable magnetic field relative to the stator, and the variable magnetic field causes the charge movement on the stator to generate current, thereby realizing the conversion of mechanical energy into electrical energy and achieving the power generation function.

[0042] In this embodiment, referring to Figure 2 , the motor coil assembly 2 is thermally sleeved on the rotor main shaft 1, and then the motor coil gland 3 presses the motor coil assembly 2 at the end face. The front radial bearing component 4 is axially installed on the rotor main shaft 1 through a thermal sleeve process. There is a step on the rotor main shaft 1. After pushing the front radial bearing component 4 in place, the thrust disk is installed on the rotor main shaft 1 by thermal sleeve, which can press the front radial bearing component 4. After installing the thrust disk, the thrust disk is pressed and fixed by the thrust disk gland 7 and the rear gland screw 8. The installation method of the rear radial bearing component 5 is the same as that of the front radial bearing component 4. After installing the rear radial bearing component 5, the impeller 9 is assembled with the rotor main shaft 1. It should be noted that the inner hole for installing the impeller 9 is a tapered hole, and the installation part of the impeller 9 on the rotor main shaft 1 is also a mating tapered surface. The purpose of setting the tapered surface connection is that the impeller 9 and the rotor main shaft 1 need to be dynamically balanced multiple times, which involves repeated disassembly and assembly. The connection method of the cylindrical surface limits the mating process. The mating method that can be used is shrink fitting. However, shrink fitting the impeller 9 is likely to cause scratches on the main shaft during multiple disassembly operations. The tapered surface design has a certain guiding property, which can effectively solve this problem during disassembly. The impeller 9 is installed on the rotor main shaft 1 through a hydraulic method, and then the front gland is pressed tightly against the rotor main shaft 1 through the front gland screw 11 until the installation is in place. At this time, the rotor assembly is installed completely.

[0043] The magnetic bearing control cabinet 36 monitors the axial and radial clearances of the rotor main shaft 1 in real time through sensors, and adjusts the coil current of the magnetic bearing assembly based on the PID algorithm to stabilize the rotor suspension attitude.

[0044] The magnetic bearing control cabinet 36 also includes a controller, a power supply, and a potentiometer. The adjustment of the potentiometer is mainly reflected in the centering of the radial and axial adjustments of the magnetic bearing. The magnetic bearing control system can adjust the position of the magnetic bearing through the potentiometer.

[0045] Specifically, the magnetic bearing control system measures the axial and radial clearances of the magnetic bearing assembly through sensors, and then controls the magnitude of the coil current according to the PID process to control the suspension attitude of the magnetic bearing, and further controls the radial and axial positions within the rotor housing. After adjusting the rotor to the correct attitude, a blow - turning experiment is carried out. After blow - turning, the rotor speeds up to the rated speed within the casing, and the positions of the rotor detected by each sensor during rotation can be viewed on the control system panel according to the rotation process.

[0046] Preferably, a tapered nozzle flow channel is provided inside the volute assembly 20 for converting the pressure energy of the CO 2 gas into kinetic energy to drive the impeller 9 to rotate.

[0047] Preferably, the magnetic bearing assembly includes a front radial bearing assembly 4, a rear radial bearing assembly 5, and a thrust disk 6. The thrust disk 6 is fixedly connected to the rotor main shaft 1 to balance the axial force.

[0048] The magnetic bearing assembly also includes a magnetic bearing housing, a magnetic bearing coil, a magnetic bearing protection cover, a magnetic bearing sensor, a magnetic bearing thrust disk, etc. The magnetic bearing assembly is connected to the rotor to adjust the position of the rotor in the casing.

[0049] The mating flange assembly mainly includes an intake reverse flange, an exhaust reverse flange, a working medium outlet reverse flange, a working medium cooling reverse flange, and a cooling water reverse flange. Its main function is to be welded to the external pipeline.

[0050] The base frame assembly is divided into a base frame 17, a base 18, and a connecting bolt assembly. Its main function is to connect the main engine housing assembly.

[0051] The wiring compartment assembly includes a wiring compartment body, a wiring compartment cover plate, a wiring board, wiring terminals, and a bell mouth. Its main function is to transmit the current generated by the generator to the outside after rectification, inversion, and voltage transformation for power consumption in the living area.

[0052] Preferably, a flow regulating valve is provided on the steam inlet pipeline of the heater 31 for controlling the flow rate of CO 2 gas flow rate.

[0053] Preferably, the exhaust steam pipeline is connected to the tail gas recovery device of the chemical production system for recycling the CO 2 gas after power generation.

[0054] In another embodiment, a magnetic levitation CO 2 pressure residual power generation system includes a generator set and a bypass valve connected in parallel to the pipeline of the magnetic levitation ORC power generation integrated machine for regulating the CO 2 gas flow rate to maintain stable power generation; The wiring compartment assembly has a built-in rectification module, inversion module, and voltage transformation module for converting electrical energy and transmitting it to the power grid or load equipment.

[0055] Preferably, the control signal of the bypass valve is linked with the sensor data of the magnetic bearing control cabinet 36 to achieve coordinated control of the power generation and the rotor suspension attitude.

[0056] Preferably, the system also includes a remote monitoring terminal for real-time display of the power generation, CO 2 flow rate, and magnetic bearing gap data, and supporting remote parameter adjustment.

[0057] In this embodiment, the type of the bypass valve: pneumatic control valve (DN150, Cv = 210), bypass flow rate 0 - 50 t / h; Control logic: linked with the magnetic bearing control cabinet 36, automatically adjusting the opening when the power generation fluctuation > ±5%.

[0058] The wiring compartment assembly includes: Rectification module: three-phase full-bridge IGBT topology, output DC voltage 600V; Inversion module: SPWM modulation, output 380V / 50Hz industrial frequency electricity; Voltage transformation module: dry-type transformer (10kV / 380V), efficiency ≥ 98%.

[0059] Functions of the remote monitoring terminal: Real-time display of power generation, CO 2 flow rate, magnetic bearing gap, and temperature data; Support remote adjustment of PID parameters and bypass valve opening via Modbus TCP protocol; Historical data storage (≥1 year) and report generation.

[0060] In another embodiment, a magnetic levitation CO 2 pressure recovery power generation method includes the following steps: S1. Guide the CO 2 gas to flow through the steam inlet pipe, heater, and magnetic levitation ORC power generation integrated machine in sequence.

[0061] CO 2 Gas pretreatment: CO 2 The tail gas enters the heater through the steam inlet pipe, and the flow rate is controlled by a pneumatic control valve (30 t / h ± 5%).

[0062] The heat source of the heater (steam condensate or hot water) exchanges heat with the CO in the shell side and tube side 2 to raise the temperature to 80 - 100 °C.

[0063] S2. In the heater, use the hot water outside the cylinder body to exchange heat with the CO 2 gas flowing through the heat exchange tubes to raise the temperature of the CO 2 gas.

[0064] Pressure energy - kinetic energy conversion: The heated CO 2 enters the volute component 20, is accelerated to 150 m / s through the converging nozzle flow channel, and drives the impeller to rotate.

[0065] The impeller speed is adjusted by the magnetic bearing control cabinet and stabilized at 30,000 - 50,000 rpm.

[0066] S3. Introduce the heated CO 2 gas into the volute component of the magnetic levitation ORC power generation integrated machine, and convert the pressure energy of the CO 2 gas into kinetic energy through the converging nozzle flow channel to drive the impeller to rotate.

[0067] Magnetic levitation dynamic regulation: The eddy current sensor monitors the rotor displacement in real time, and the PID algorithm dynamically adjusts the magnetic bearing current (0 - 20 A); The thrust disk offsets the axial force to ensure that the rotor suspension gap is 0.2 mm ± 0.05 mm.

[0068] S4. Use the electromagnetic force generated by the magnetic bearing assembly to levitate and support the rotor main shaft, and monitor the axial and radial clearances of the rotor main shaft in real time. Adjust the magnetic bearing coil current based on the PID algorithm to maintain the stability of the rotor suspension posture.

[0069] Mechanical energy - electrical energy conversion: The rotor coil is coupled with the stator magnetic field to generate three-phase alternating current (400V / 50Hz); The electric energy is rectified and inverted in the junction box and then connected to the factory power grid, with a power factor ≥ 0.95.

[0070] S5. The mechanical energy of the impeller 9 is converted into electrical energy through electromagnetic induction between the motor coil assembly on the rotor main shaft and the stator coil.

[0071] Exhaust gas recycling: After power generation, CO 2 (pressure 0.1MPa, temperature 38~54℃) returns to the chemical system through the exhaust pipe to participate in subsequent reactions or compressed storage.

[0072] S6: CO after power generation 2 The gas is transported to the tail gas recovery device through the exhaust pipe for recycling; S7, collect power generation and CO in real time through remote monitoring terminal 2 The flow rate and magnetic bearing clearance data can be obtained, and the PID parameters or bypass valve opening of the magnetic bearing control cabinet 36 can be adjusted remotely.

[0073] Preferably, in step S2, the flow rate of CO entering the heater is adjusted by a flow control valve provided on the pipeline entering the heater. 2 Gas flow rate to match heat exchange efficiency requirements; In step S3, the opening of the bypass valve on the pipeline entering the magnetic suspension ORC generator is adjusted to control the CO entering the volute assembly. 2 Gas flow rate to maintain power generation stability; In step S4, the suspension position of the rotor main shaft is coordinated and controlled by the front radial bearing assembly, the rear radial bearing assembly and the thrust plate. The thrust plate is used to offset the CO 2 The axial force generated when the gas drives the impeller; In step S6, the CO 2 The gas returns to the chemical production system through the exhaust pipe to participate in subsequent chemical reactions or be compressed and stored.

[0074] The present invention adopts magnetic bearing technology: it replaces mechanical bearings, eliminates friction loss, and realizes oil-free operation; integrated ORC generator set: integrates expander and generator to simplify system structure; dynamic adjustment mechanism: maintains stable power generation through coordinated control of bypass valve and magnetic bearing; intelligent control system: adjusts magnetic bearing current in real time based on PID algorithm to ensure stable rotor suspension posture.

Claims

1. A magnetically suspended CO2 residual pressure generator set, characterized in that: include: CO2 gas pipeline components; It includes a steam inlet pipeline, a heater inlet pipeline, a magnetic suspension ORC power generation integrated machine pipeline, a pipeline valve and an exhaust pipeline, and the CO2 gas pipeline assembly is used to transport CO2 gas; The heater (31) comprises a cylinder, a heat exchange tube, a tube sheet and a baffle, wherein the CO2 gas flowing in the heat exchange tube exchanges heat with the hot water outside the cylinder; A magnetically suspended ORC integrated power generation machine (34), comprising a volute assembly (20), a rotor main shaft (1), an impeller, a magnetic bearing assembly and a stator coil, wherein the impeller is driven to rotate by CO2 gas, the magnetic bearing assembly supports the rotor main shaft (1) by electromagnetic force, and the stator coil cooperates with a motor coil assembly (2) of the rotor main shaft (1) to realize the conversion of mechanical energy into electrical energy; The magnetic bearing control cabinet (36) monitors the axial and radial clearances of the rotor main shaft (1) in real time through sensors, and adjusts the coil current of the magnetic bearing assembly based on a PID algorithm to stabilize the rotor suspension posture.

2. The magnetically suspended CO2 residual pressure generator set according to claim 1, characterized in that: The volute assembly (20) is provided with a tapered nozzle flow channel for converting the pressure energy of the CO2 gas into kinetic energy to drive the impeller (9) to rotate.

3. The magnetically suspended CO2 residual pressure generator set according to claim 1 is characterized in that: The magnetic bearing assembly comprises a front radial bearing assembly (4), a rear radial bearing assembly (5) and a thrust plate (6); the thrust plate (6) is fixedly connected to the rotor main shaft (1) to balance the axial force.

4. The magnetically suspended CO2 residual pressure generator set according to claim 1, characterized in that: A flow regulating valve is provided on the steam inlet pipe of the heater (31) for controlling the flow rate of CO2 gas entering the heater (31).

5. The magnetically suspended CO2 residual pressure generator set according to claim 1 is characterized in that: The exhaust steam pipeline is connected to the tail gas recovery device of the chemical production system, and is used to recycle the CO2 gas after power generation.

6. A magnetically suspended CO2 residual pressure power generation system, characterized in that: A generator set comprising any one of claims 1 to 5, and a bypass valve connected in parallel to a pipeline entering a magnetically suspended ORC integrated generator, for regulating the flow of CO2 gas to maintain stable power generation; The junction box assembly has a built-in rectifier module, inverter module and transformer module, which are used to convert electrical energy and transmit it to the power grid or load equipment.

7. The magnetic levitation CO2 residual pressure power generation system according to claim 6 is characterized in that: The control signal of the bypass valve is linked with the sensor data of the magnetic bearing control cabinet (36) to achieve coordinated regulation of the power generation and the rotor suspension posture.

8. The magnetic levitation CO2 residual pressure power generation system according to claim 6 is characterized in that: The system also includes a remote monitoring terminal for real-time display of power generation, CO2 flow and magnetic bearing gap data, and supports remote adjustment of parameters.

9. A magnetic levitation CO2 residual pressure power generation method, characterized in that: The following steps are involved: S1, guiding the CO2 gas to flow sequentially through the steam inlet pipe, the heater (31) and the magnetic suspension ORC power generation integrated machine (34) through the pipeline assembly; S2. In the heater (31), the hot water outside the cylinder is used to perform heat exchange with the CO2 gas flowing through the heat exchange tube to increase the temperature of the CO2 gas; S3, passing the heated CO2 gas into the volute assembly (20) of the magnetic suspension ORC power generation integrated machine (34), converting the pressure energy of the CO2 gas into kinetic energy through the tapered nozzle flow channel, and driving the impeller (9) to rotate; S4, suspending and supporting the rotor main shaft (1) through the electromagnetic force generated by the magnetic bearing assembly, monitoring the axial and radial clearances of the rotor main shaft (1) in real time, and adjusting the magnetic bearing coil current based on a PID algorithm to maintain a stable rotor suspension posture; S5, converting the mechanical energy of the impeller (9) into electrical energy through electromagnetic induction between the motor coil assembly on the rotor main shaft (1) and the stator coil; S6, transporting the CO2 gas after power generation to the tail gas recovery device through the exhaust pipe for recycling; S7. The power generation power, CO2 flow rate and magnetic bearing clearance data are collected in real time through the remote monitoring terminal, and the PID parameters or bypass valve opening of the magnetic bearing control cabinet (36) are remotely adjusted.

10. The magnetic levitation CO2 excess pressure power generation method according to claim 9, characterized in that: In step S2, the flow rate of CO2 gas entering the heater (31) is adjusted by a flow regulating valve arranged on the pipeline entering the heater to match the heat exchange efficiency requirement; In step S3, the flow rate of CO2 gas entering the volute assembly (20) is controlled by adjusting the opening of the bypass valve on the pipeline entering the magnetic suspension ORC integrated power generation machine to maintain the stability of the power generation; In the step S4, the suspension position of the rotor main shaft (1) is cooperatively regulated by the front radial bearing assembly (4), the rear radial bearing assembly (5) and the thrust plate (6), wherein the thrust plate (6) is used to offset the axial force generated when the CO2 gas drives the impeller (9); In step S6, the CO2 gas after power generation is returned to the chemical production system through the exhaust pipe to participate in subsequent chemical reactions or compressed storage.

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