Magnetic suspension type cascade power generation system suitable for medium and low temperature terrestrial heat

Abstract

The utility model provides a magnetic suspension type cascade power generation system suitable for medium and low temperature terrestrial heat. Comprising a preheater, a low-pressure-stage evaporator, a high-pressure-stage evaporator, a high-pressure-stage magnetic suspension turbine power generation all-in-one machine, a low-pressure-stage magnetic suspension turbine power generation all-in-one machine, a high-pressure-stage working medium pump, a gas-liquid separator, a condenser, a low-pressure-stage working medium pump and working medium pipelines between all the components. The organic working medium circularly flows in each component and the working medium pipeline; an organic Rankine cycle form containing coupling of different pressure levels is designed, the working efficiency and the heat utilization rate of the system can be improved, and heat exchange process loss can be reduced; in the system, a magnetic suspension turbine power generation all-in-one machine is adopted to replace a traditional turbine, the defects of insufficient power generation efficiency, large loss and the like in the prior art can be effectively overcome, the heat-electricity energy conversion efficiency of the system can be remarkably improved, and full utilization of medium and low temperature geothermal energy is facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of geothermal power generation technology, specifically relating to a magnetic levitation cascade power generation system suitable for medium and low temperature geothermal energy. Background Technology

[0002] Currently, the utilization of medium- and low-temperature geothermal sources with temperatures around 150℃ is mainly achieved through Rankine cycle power generation. However, the existing Rankine cycle has drawbacks in this temperature range, such as large heat exchange losses and low transmission efficiency between turbines and generators, which limit the actual energy conversion efficiency and consequently affect the current utilization of medium- and low-temperature geothermal energy. Summary of the Invention

[0003] In view of the above, and in response to the technical problems existing in this field, this utility model provides a magnetic levitation cascade power generation system suitable for medium and low temperature geothermal energy, specifically including:

[0004] The system includes a preheater, a low-pressure stage evaporator, a high-pressure stage evaporator, a high-pressure stage magnetic levitation turbine generator, a low-pressure stage magnetic levitation turbine generator, a high-pressure stage working fluid pump, a gas-liquid separator, a condenser, a low-pressure stage working fluid pump, and working fluid pipelines between the components; the organic working fluid circulates in the components and working fluid pipelines.

[0005] The high-pressure stage evaporator, low-pressure stage evaporator, and preheater are connected by a heat source fluid pipeline. The heat source fluid flows through the high-pressure stage evaporator, low-pressure stage evaporator, and preheater in sequence to complete heat exchange and then becomes a low-temperature fluid. The geothermal heat source carrier fluid can be any one of water, flue gas, or heat transfer oil.

[0006] The working fluid outlet of the high-pressure stage evaporator is connected to the working fluid inlet of the high-pressure stage magnetic levitation turbine generator; the working fluid outlet of the high-pressure stage magnetic levitation turbine generator is connected to the low-pressure stage magnetic levitation turbine generator; the working fluid inlet of the low-pressure stage magnetic levitation turbine generator is also connected to the working fluid outlet of the low-pressure stage evaporator and the gas outlet of the gas-liquid separator, and its working fluid outlet is connected to the condenser; the working fluid outlet of the condenser is connected to the low-pressure stage working fluid pump, and the working fluid outlet of the low-pressure stage working fluid pump is connected to the preheater; the working fluid outlet of the preheater is connected to the gas-liquid separator; the liquid outlet of the gas-liquid separator is connected to the working fluid inlets of the low-pressure stage evaporator and the high-pressure stage working fluid pump respectively; the working fluid outlet of the high-pressure stage working fluid pump is connected to the working fluid inlet of the high-pressure stage evaporator.

[0007] Furthermore, the working fluid pump can be any type of pump, such as a gear pump, centrifugal pump, or screw pump.

[0008] Furthermore, the preheater, low-pressure stage evaporator, high-pressure stage evaporator, and condenser are selected from suitable types of heat exchangers, such as shell-and-tube heat exchangers, finned tube heat exchangers, and plate heat exchangers.

[0009] The present invention provides a magnetic levitation cascade power generation system suitable for medium and low temperature geothermal energy. It is designed with an organic Rankine cycle with coupling of different pressure levels, which can improve the system's working efficiency, heat utilization rate and reduce heat exchange process losses. The system uses a magnetic levitation turbine generator to replace the traditional turbine, which can effectively overcome the defects of insufficient power generation efficiency and large losses of existing technologies, and can significantly improve the heat-to-electric energy conversion efficiency, which is conducive to the full utilization of medium and low temperature geothermal energy. Attached Figure Description

[0010] Figure 1 A schematic diagram of a magnetic levitation cascade power generation system suitable for medium and low temperature geothermal energy, provided by this utility model. Detailed Implementation

[0011] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0012] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0013] The magnetic levitation cascade power generation system suitable for medium and low temperature geothermal energy provided by this utility model, such as Figure 1 As shown, it specifically includes:

[0014] The system includes a preheater 5, a low-pressure stage evaporator 7, a high-pressure stage evaporator 9, a high-pressure stage magnetic levitation turbine generator 1, a low-pressure stage magnetic levitation turbine generator 2, a high-pressure stage working fluid pump 8, a gas-liquid separator 6, a condenser 3, a low-pressure stage working fluid pump 4, and working fluid pipelines between the components; the organic working fluid circulates in the components and working fluid pipelines.

[0015] The high-pressure stage evaporator 9, the low-pressure stage evaporator 7, and the preheater 5 are connected by a heat source fluid pipeline; the heat source fluid flows through the high-pressure stage evaporator 9, the low-pressure stage evaporator 7, and the preheater 5 in sequence to complete heat exchange and then becomes a low-temperature fluid.

[0016] The working fluid outlet of the high-pressure stage evaporator 9 is connected to the working fluid inlet of the high-pressure stage magnetic levitation turbine generator 1; the working fluid outlet of the high-pressure stage magnetic levitation turbine generator 1 is connected to the low-pressure stage magnetic levitation turbine generator 2; the working fluid inlet of the low-pressure stage magnetic levitation turbine generator 2 is also connected to the working fluid outlet of the low-pressure stage evaporator 7 and the gas outlet of the gas-liquid separator 6, and its working fluid outlet is connected to the condenser 3; the working fluid outlet of the condenser 3 is connected to the low-pressure stage working fluid pump 4, and the working fluid outlet of the low-pressure stage working fluid pump 4 is connected to the preheater 5; the working fluid outlet of the preheater 5 is connected to the gas-liquid separator 6; the liquid outlet of the gas-liquid separator 6 is connected to the working fluid inlets of the low-pressure stage evaporator 7 and the high-pressure stage working fluid pump 8 respectively; the working fluid outlet of the high-pressure stage working fluid pump 8 is connected to the working fluid inlet of the high-pressure stage evaporator 9.

[0017] In operation, the high-pressure stage evaporator 9 receives the heat source fluid and exchanges heat with the organic working fluid to transform it into high-pressure stage steam. The heat source fluid after heat exchange flows from the high-pressure stage evaporator 9 to the low-pressure stage evaporator 7, and after completing heat exchange again, it flows to the preheater 5.

[0018] High-pressure steam flows out of high-pressure evaporator 9 and enters high-pressure magnetic levitation turbine generator 1 for expansion, work, and power generation. The organic working fluid after work is converted into low-pressure steam and transported from high-pressure magnetic levitation turbine generator 1 to low-pressure magnetic levitation turbine generator 2. The low-pressure steam expands and generates electricity at low-pressure magnetic levitation turbine generator 2. The organic working fluid after work is reduced to the condensing pressure and transported from low-pressure magnetic levitation turbine generator 2 to condenser 3 for cooling and conversion into saturated liquid. The organic working fluid liquid is transported from condenser 3 to preheater 5 under the action of low-pressure working fluid pump 4. After heat exchange with the heat source fluid from low-pressure evaporator 7, it flows to gas-liquid separator 6. After gas-liquid separation in gas-liquid separator 6, the organic working fluid liquid flows back to high-pressure evaporator 9 under the action of high-pressure working fluid pump 8 to enter the next cycle. The organic working fluid saturated steam then enters low-pressure magnetic levitation turbine generator 2 for expansion, work, and power generation.

[0019] In a preferred embodiment of this utility model, the working fluid pump is specifically selected from any type of gear pump, centrifugal pump, screw pump, etc.

[0020] In a preferred embodiment of this utility model, the preheater 5, the low-pressure stage evaporator 7, the high-pressure stage evaporator 9, and the condenser 3 are selected from suitable types of shell-and-tube heat exchangers, coaxial heat exchangers, finned tube heat exchangers, and plate heat exchangers, respectively.

[0021] It should be understood that the sequence number of each step in the embodiments of this utility model does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this utility model.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A magnetic levitation cascade power generation system suitable for medium and low temperature geothermal energy, characterized in that: Specifically, it includes: The system includes a preheater, a low-pressure stage evaporator, a high-pressure stage evaporator, a high-pressure stage magnetic levitation turbine generator, a low-pressure stage magnetic levitation turbine generator, a high-pressure stage working fluid pump, a gas-liquid separator, a condenser, a low-pressure stage working fluid pump, and working fluid pipelines between the components; the organic working fluid circulates in the components and working fluid pipelines. The high-pressure stage evaporator, low-pressure stage evaporator, and preheater are connected by a heat source fluid pipeline. The heat source fluid flows through the high-pressure stage evaporator, low-pressure stage evaporator, and preheater in sequence to complete heat exchange and then becomes a low-temperature fluid. The geothermal heat source carrier fluid can be any one of water, flue gas, or heat transfer oil. The working fluid outlet of the high-pressure stage evaporator is connected to the working fluid inlet of the high-pressure stage magnetic levitation turbine generator; the working fluid outlet of the high-pressure stage magnetic levitation turbine generator is connected to the low-pressure stage magnetic levitation turbine generator; the working fluid inlet of the low-pressure stage magnetic levitation turbine generator is also connected to the working fluid outlet of the low-pressure stage evaporator and the gas outlet of the gas-liquid separator, and its working fluid outlet is connected to the condenser; the working fluid outlet of the condenser is connected to the low-pressure stage working fluid pump, and the working fluid outlet of the low-pressure stage working fluid pump is connected to the preheater; the working fluid outlet of the preheater is connected to the gas-liquid separator; the liquid outlet of the gas-liquid separator is connected to the working fluid inlets of the low-pressure stage evaporator and the high-pressure stage working fluid pump respectively; the working fluid outlet of the high-pressure stage working fluid pump is connected to the working fluid inlet of the high-pressure stage evaporator.

2. The magnetic levitation cascade power generation system suitable for medium and low temperature geothermal energy as described in claim 1, characterized in that: The working fluid pump can be any one of gear pump, centrifugal pump, or screw pump.

3. The magnetic levitation cascade power generation system suitable for medium and low temperature geothermal energy as described in claim 1, characterized in that: The types of preheaters, low-pressure stage evaporators, high-pressure stage evaporators, and condensers are selected from shell-and-tube heat exchangers, coaxial heat exchangers, finned tube heat exchangers, and plate heat exchangers, respectively.

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