Magnetic suspension generator set using waste heat of deaerator

Abstract

The utility model discloses a deaerator waste heat magnetic suspension generator set which comprises a 1 # medium-pressure deaerator and a 2 # low-pressure deaerator which are used for outputting emptied dead steam as a heat source. The medium-pressure evaporation preheater and the low-pressure evaporation preheater are used for preheating a working medium through dead steam; the magnetic suspension ORC all-in-one machine is connected with the evaporation preheater, a turbine is arranged in the magnetic suspension ORC all-in-one machine, and a working medium pushes the turbine to rotate and drives a generator to generate electricity; the condenser is connected with a working medium outlet of the magnetic suspension ORC all-in-one machine and used for condensing the expanded working medium into a liquid state; the working medium pump is connected with the condenser and the evaporation preheater; the buffer tank is used for mixing and buffering the water subjected to heat exchange; and the condensate pump is connected with the buffer tank and is used for conveying the buffered water back to the circulating deaerator for cyclic utilization. Compared with a traditional unit, an oil station and other auxiliary machine systems are omitted, dead steam of the deaerator exchanges heat with a unit working medium through the heat exchanger and then enters the magnetic levitation unit for power generation, and the overall structure is more compact.

Description

Technical Field

[0001] This utility model relates to the field of thermal power generation technology, and in particular to a magnetic levitation generator set for waste heat from a deaerator. Background Technology

[0002] In industrial production, deaerators are crucial equipment. Currently, common deaerators include medium-pressure deaerators and low-pressure deaerators. Medium-pressure deaerator #1 has an output pressure of 0.2-0.24 MPa and an operating temperature of 130-135℃, primarily supplying water to boilers. Low-pressure deaerator #2 has an operating pressure of 0.1-0.15 MPa and an operating temperature of 110-115℃, mainly recovering exhaust steam after condensate heating and deaeration. During the deaeration process, both medium-pressure deaerator #1 and low-pressure deaerator #2 discharge a large amount of exhaust steam carrying considerable heat energy, but previously, this steam was mostly directly vented, resulting in significant energy waste. Utility Model Content

[0003] The purpose of this invention is to provide a magnetic levitation generator set for waste heat from a deaerator, thereby solving the aforementioned problems in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A deaerator waste heat magnetic levitation generator set, comprising:

[0006] The No. 1 medium-pressure deaerator and the No. 2 low-pressure deaerator are used to output exhaust steam as a heat source.

[0007] The medium-pressure evaporator preheater and the low-pressure evaporator preheater are respectively connected to the No. 1 medium-pressure deaerator 1 and the No. 2 low-pressure deaerator, and are used to preheat the working fluid with exhaust steam;

[0008] The magnetic levitation ORC integrated machine is connected to the evaporative preheater and has a turbine inside. The working fluid drives the turbine to rotate and drives the generator to generate electricity.

[0009] The condenser, connected to the working fluid outlet of the magnetic levitation ORC integrated machine, is used to condense the expanded working fluid into a liquid state;

[0010] A working fluid pump, connected to the condenser and the evaporator preheater, is used to pressurize and deliver the liquid working fluid to the preheating device;

[0011] The buffer tank, connected to the outlet of the evaporator preheater, is used to mix and buffer the water after heat exchange.

[0012] The condensate pump, connected to the buffer tank, is used to return the buffered water to the circulating deaerator for recycling.

[0013] In some specific embodiments, the medium-pressure evaporative preheater and the low-pressure evaporative preheater are plate heat exchangers or shell-and-tube heat exchangers, with multiple heat exchange channels inside, and the working fluid and exhaust steam flow in opposite directions for heat exchange.

[0014] In some specific embodiments, the magnetic levitation ORC integrated machine includes a turbine supported by a magnetic bearing and a generator coaxially connected. The rotor of the turbine is driven by magnetic levitation technology and cooled by the flow of working fluid.

[0015] In some specific embodiments, the condenser is connected to a cooling tower or a circulating water system, and the condensed working fluid is pumped to a medium-pressure evaporator preheater and a low-pressure evaporator preheater in two separate paths.

[0016] In some specific embodiments, a water level sensor is installed at the top of the buffer tank, and the bottom is fed back to the No. 1 medium-pressure deaerator and the No. 2 low-pressure deaerator through two paths via a condensate pump.

[0017] In some specific embodiments, the working fluid is a low-boiling-point organic working fluid, including R245fa refrigerant, R1234ze, or a mixture of working fluids.

[0018] In some specific embodiments, the magnetic levitation ORC integrated machine and the generator are connected by a direct-drive magnetic levitation bearing.

[0019] In some specific embodiments, the system further includes a control unit for monitoring the deaerator exhaust steam temperature, working fluid flow rate, and generator speed, and for adjusting the delivery pressure of the working fluid pump.

[0020] The beneficial effects of this utility model are as follows: This utility model discloses a deaerator waste heat magnetic levitation generator set, including a No. 1 medium-pressure deaerator and a No. 2 low-pressure deaerator, used to output exhaust steam as a heat source; a medium-pressure evaporator preheater and a low-pressure evaporator preheater, respectively connected to the No. 1 medium-pressure deaerator and the No. 2 low-pressure deaerator, used to preheat the working fluid through the exhaust steam; a magnetic levitation ORC integrated machine, connected to the evaporator preheater, with a turbine installed inside, the working fluid driving the turbine to rotate and drive the generator to generate electricity; a condenser, connected to the working fluid outlet of the magnetic levitation ORC integrated machine, used to condense the expanded working fluid into a liquid state; a working fluid pump, connected to the condenser and the evaporator preheater, used to pressurize and transport the liquid working fluid to the preheater; a buffer tank, connected to the outlet of the evaporator preheater, used to mix and buffer the water after heat exchange; and a condensate pump, connected to the buffer tank, used to return the buffered water to the circulating deaerator for recycling. The beneficial effects of this utility model are as follows:

[0021] 1. Compact structure: Compared with traditional units, the oil station and other auxiliary systems are eliminated. The exhaust steam from the deaerator exchanges heat with the working fluid of the unit through a heat exchanger before entering the maglev unit for power generation, resulting in a more compact overall structure.

[0022] 2. Speed ​​advantage: Maglev units use magnetic bearings instead of oil bearings. The speed of magnetic bearings is theoretically determined by the impeller rotation speed and has no upper limit, while the speed of traditional units is limited by factors such as oil station, bearing wear, and oil film stiffness.

[0023] 3. Improved efficiency: Maglev units eliminate the need for gearboxes, couplings, oil film bearings, etc., and adopt a coaxial structure of magnetic bearings, reducing mechanical efficiency losses caused by mechanical connection structures and improving power generation efficiency.

[0024] 4. Reasonable cooling: The heat generated by the high-speed rotation of the rotor can be cooled by the working fluid. The circulating working fluid carries away the heat and then re-enters the preheater, reducing heat loss.

[0025] 5. Waste heat recycling: After the steam from the deaerator passes through the evaporator for heat exchange, it is cooled and depressurized to form a liquid that enters the buffer tank. Then, it is pumped back into the deaerator by the condensate pump, thus realizing the recycling of waste heat. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the compressed air energy storage waste heat recovery and utilization system of this utility model.

[0027] In the attached diagram: 1. No. 1 medium-pressure deaerator; 2. No. 2 medium-pressure deaerator; 3. Medium-pressure preheating evaporator; 4. Low-pressure preheating evaporator; 5. Magnetic levitation ORC integrated machine; 6. Generator; 7. Condenser; 8. Chiller return water; 9. Chiller inlet water; 10. No. 1 working fluid pump; 11. No. 2 working fluid pump; 12. Buffer tank; 13. No. 1 condensate pump; 14. No. 2 condensate pump; 15. Circulating deaerator. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0029] Reference Figure 1 The deaerator waste heat magnetic levitation generator set shown includes a No. 1 medium-pressure deaerator 1 and a No. 2 low-pressure deaerator 2, which are used to output exhaust steam as a heat source.

[0030] The medium-pressure evaporation preheating device 3 and the low-pressure evaporation preheating device 4 are connected to the No. 1 medium-pressure deaerator 1 and the No. 2 low-pressure deaerator 2, respectively, and are used to preheat the working fluid through exhaust steam.

[0031] The magnetic levitation ORC integrated machine 5 is connected to the evaporation preheating device. It is equipped with a turbine inside, and the working fluid drives the turbine to rotate and drives the generator 6 to generate electricity. The evaporation preheating device includes: medium-pressure preheating evaporator 3 and low-pressure preheating evaporator 4.

[0032] Condenser 7 is connected to the working fluid outlet of the magnetic levitation ORC integrated machine 5 and is used to condense the expanded working fluid into a liquid state.

[0033] A working fluid pump, connected to the condenser 7 and the evaporator preheating device, is used to pressurize and deliver the liquid working fluid to the preheating device; the working fluid pump includes: working fluid pump 10 (1#) and working fluid pump 11 (2#). It should be noted that the end of the condenser 7 furthest from the working fluid pump is connected to the chiller inlet 9 and the chiller outlet 8.

[0034] Buffer tank 12 is connected to the outlet of the evaporation preheating device and is used to mix and buffer the water after heat exchange.

[0035] A condensate pump, connected to buffer tank 12, is used to return buffered water to the circulating deaerator 15 for recycling. The condensate pump includes condensate pump #1 13 and condensate pump #2 14.

[0036] In some specific embodiments, the medium-pressure evaporation preheating device 3 and the low-pressure evaporation preheating device 4 are plate heat exchangers or shell-and-tube heat exchangers, with multiple heat exchange channels inside, and the working fluid and exhaust steam flow in opposite directions for heat exchange.

[0037] In some specific embodiments, the magnetic levitation ORC integrated machine 5 includes a turbine supported by a magnetic bearing and a generator 6 coaxially connected. The rotor of the turbine is driven by magnetic levitation technology and is cooled by the flow of working fluid.

[0038] In some specific embodiments, the condenser 7 is connected to a cooling tower or a circulating water system, and after the working fluid is condensed, it is delivered to the medium-pressure evaporation preheating device 3 and the low-pressure evaporation preheating device 4 through two separate working fluid pumps.

[0039] In some specific embodiments, a water level sensor is installed at the top of the buffer tank 12, and the bottom is fed back to the No. 1 medium-pressure deaerator 1 and the No. 2 low-pressure deaerator 2 via two paths through a condensate pump.

[0040] In some specific embodiments, the working fluid is a low-boiling-point organic working fluid, including R245fa refrigerant, R1234ze refrigerant, or a mixture of working fluids.

[0041] In some specific embodiments, the magnetic levitation ORC integrated machine 5 and the generator 6 are connected by a direct-drive magnetic levitation bearing.

[0042] In some specific embodiments, the system also includes a control unit for monitoring the deaerator exhaust steam temperature, working fluid flow rate, and generator speed, and for adjusting the delivery pressure of the working fluid pump.

[0043] The working process of the waste heat recovery unit of the deaerator is as follows:

[0044] 1. Heat Source Input: Heat from other process sections enters Deaerator 1 (No. 1) and Deaerator 2 (No. 2). The heat source parameters are: exhaust steam temperature 132℃. The heat is first introduced into the low-pressure evaporator preheater 4 and the medium-pressure evaporator preheater 3 for heat exchange with the working fluid. Then, the hot water at this temperature is distributed in flow. During operation, Deaerator 1 (No. 1) and Deaerator 2 (No. 2) heat the demineralized water and condensate to above the saturation temperature at the corresponding working pressure, causing oxygen to be released from the water and discharged, thus completing the deoxygenation operation.

[0045] 2. Heat Exchange Power Generation: The exhaust steam from the deaerator serves as a heat source. A portion of this heat enters the medium-pressure evaporative preheating device 3 to exchange heat with the working fluid, cooling it to 52°C. At the outlet of the medium-pressure evaporative preheater 3, it enters the inlet of the magnetically levitated ORC integrated machine 5, driving the turbine inside the machine to rotate and power the generator 6. The expanded working fluid enters the evaporative condenser 7 and condenses into a liquid state. It then flows into two collection tanks, and finally, two working fluid pumps extract the working fluid from the collection tanks, pressurize it, and send it back to the medium-pressure evaporative preheater 3. After evaporation, it re-enters the magnetically levitated ORC integrated machine 5 to generate electricity. The working process of the low-pressure evaporative preheater 4 is similar.

[0046] Another heat source is the exhaust steam at 120°C, which enters the low-pressure evaporator preheater 4 to exchange heat with the working fluid. After heat exchange in the low-pressure evaporator preheater 4, the gaseous working fluid enters the magnetic levitation ORC integrated machine 5, which drives the turbine inside the magnetic levitation ORC integrated machine 5 to rotate, thereby driving the generator 6 to generate electricity. The expanded working fluid enters the evaporative condenser 7 and condenses into a liquid state, flowing into two collection tanks. Finally, two working fluid pumps extract the working fluid from the collection tanks and pressurize it to send it to the low-pressure evaporator preheater 3. After evaporation, it enters the magnetic levitation ORC integrated machine 5 again to do work and generate electricity.

[0047] 3. Condensate treatment: After the two streams of water at different temperatures after heat exchange are mixed, they enter the buffer tank 12 and then enter the No. 1 condensate tank 13 and the No. 2 condensate tank 14. After flowing back into the conveying pipe, they can be circulated to remove oxygen from the device 15 and then transported to other process sections.

[0048] 4. System sealing: The unit adopts rigid pipes and flanges directly connected. The inlet and outlet of each component are directly connected by welded flanges. Sealing gaskets are added at the flange joints to reduce pipeline leakage losses.

[0049] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0050] This utility model of a magnetic levitation generator set for waste heat from a deaerator achieves efficient recovery and utilization of waste heat from deaerator exhaust steam through a unique structural design and working process. While improving power generation efficiency, it reduces energy waste and environmental pollution, resulting in good economic and social benefits.

[0051] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A deaerator waste heat magnetic levitation generator set, characterized by, It comprises: 1# medium pressure deaerator (1) and 2# low pressure deaerator (2) for outputting exhaust steam as heat source; Medium pressure evaporation preheater (3) and low pressure evaporation preheater (4) connected with 1# medium pressure deaerator (1) and 2# low pressure deaerator (2) respectively, for preheating working medium by exhaust steam; Magnetic suspension ORC integrated machine (5) connected with evaporation preheater (3, 4), internally provided with turbine, working medium drives turbine to rotate and drives generator (6) to generate electricity; Condenser (7) connected with working medium outlet of magnetic suspension ORC integrated machine (5), for condensing expanded working medium into liquid state; Working medium pump (10, 11) connected with condenser (7) and evaporation preheater (3, 4), for pressurizing and conveying liquid working medium to preheating device; Buffer tank (12) connected with water outlet of evaporation preheater (3, 4), for mixing and buffering heat-exchanged water; Condensate pump (13, 14) connected with buffer tank (12), for recycling buffered water to circulating deaerator (15).

2. The deaerator waste heat magnetic suspension generator set according to claim 1, wherein: The medium pressure evaporation preheater (3) and low pressure evaporation preheater (4) are plate heat exchangers or shell-and-tube heat exchangers, internally provided with multiple heat exchange channels, working medium and exhaust steam flow reversely to exchange heat.

3. The deaerator waste heat magnetic suspension generator set according to claim 1, wherein: The magnetic suspension ORC integrated machine (5) comprises turbine with magnetic bearing support and coaxially connected generator (6), rotor of the turbine is driven by magnetic suspension technology and cooled by working medium flow.

4. The deaerator waste heat magnetic levitation generator set of claim 1, wherein: The condenser (7) is connected with cooling tower or circulating water system, working medium after condensation is conveyed to medium pressure evaporation preheater (3) and low pressure evaporation preheater (4) by working medium pump (10, 11) in two ways.

5. The deaerator waste heat magnetic levitation generator set of claim 1, wherein: The buffer tank (12) is provided with water level sensor at top and condensate pump (13, 14) at bottom to recycle water to 1# medium pressure deaerator (1) and 2# low pressure deaerator (2) in two ways.

6. The deaerator waste heat magnetic levitation generator set of claim 1, wherein: The working medium is low boiling point organic working medium, including R245fa refrigerant, R1234ze refrigerant or mixed working medium.

7. The deaerator waste heat magnetic levitation generator set of claim 1, wherein: The magnetic suspension ORC integrated machine (5) and generator (6) are connected by direct drive type magnetic suspension bearing.

8. The deaerator waste heat magnetic levitation generator set of claim 1, wherein: It further comprises control unit for monitoring deaerator exhaust steam temperature, working medium flow and generator speed, and adjusting conveying pressure of working medium pump (10, 11).

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