CN210033736U - Medium-low temperature terrestrial heat ORC magnetic suspension composite step power generation system - Google Patents

Abstract

The utility model relates to a medium-low temperature geothermal ORC maglev composite cascade power generation system, which comprises a first-level ORC generator set and a second-level ORC generator set; the first-level ORC generator set includes a first-stage evaporator for evaporating a first working medium, A primary generator connected to the primary evaporator, a secondary evaporator connected to the primary generator for evaporating the second working medium, respectively connected to the secondary evaporator and the primary evaporator The first condenser connected to the second-stage ORC generator set includes the second-stage evaporator, the second-stage generator connected to the second-stage evaporator, and the second-stage evaporator and the second-stage evaporator, respectively. The second condenser connected to the stage generator; the generator for the third working medium concentration, the third condenser and the absorber. The utility model solves the problem of low middle and low temperature geothermal power generation efficiency in the prior art.

Description

Medium and low temperature geothermal ORC maglev composite cascade power generation system

technical field

The utility model relates to the technical field of geothermal power generation, in particular to a medium-low temperature geothermal ORC magnetic suspension composite cascade power generation system.

Background technique

With the exhaustion of fossil energy, renewable energy is in the ascendant. As a clean resource with huge reserves, geothermal energy is expected to become one of the clean energy sources to replace traditional fossil energy in the future. my country is rich in geothermal resources, with 2,334 exposed hot springs and 5,818 geothermal mining wells. The amount of hydrothermal geothermal resources is equivalent to 1.25 trillion tons of standard coal, and the annual mineable amount is equivalent to 1.865 billion tons of standard coal; the annual mineable amount of shallow geothermal energy resources in 336 cities above the prefecture level is equivalent to 700 million tons of standard coal; hot dry rock Prospective resources are equivalent to 856 trillion tons of standard coal. However, the geographical distribution of geothermal resources in my country is uneven. A small amount of high-temperature geothermal energy is mainly distributed in the plateau areas such as Tibet and Yunnan, while the medium-low temperature hydrothermal energy resources accounting for more than 95% are mainly distributed in North China, Songliao and North Jiangsu. , Jianghan, Ordos, Sichuan and other plains (basins) and the southeastern coastal areas. Therefore, the existence of geothermal resources in my country determines that the development of geothermal energy in my country is mainly based on low-temperature geothermal power generation, supplemented by high-temperature geothermal power generation. However, the low power generation efficiency (less than 10%) and the small amount of power generation of low and medium temperature geothermal resources seriously restrict the promotion of power generation and utilization of medium and low temperature geothermal resources.

Therefore, the existing technology still needs to be improved and developed.

Utility model content

In view of the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a medium and low temperature geothermal ORC magnetic levitation composite cascade power generation system, which aims to solve the problem of low power generation efficiency using medium and low temperature geothermal energy.

The technical scheme adopted by the present invention for solving the above-mentioned technical problems is as follows:

Medium and low temperature geothermal ORC maglev composite cascade power generation system, including:

ORC generator sets, including primary ORC generator sets and secondary ORC generator sets;

The first-stage ORC generator set includes a first-stage evaporator for evaporating the first working medium, a first-stage generator connected with the first-stage evaporator, and a second-stage generator connected with the first-stage generator for evaporating the second working medium. a secondary evaporator for working fluid, a first condenser connected to the secondary evaporator, and a first working fluid pump connected to the first condenser and the primary evaporator respectively;

The two-stage ORC generator set includes, the two-stage evaporator, a two-stage generator connected to the two-stage evaporator, and a second condenser connected to the two-stage generator, respectively connected to the second stage. a second working fluid pump connected to the condenser and the secondary evaporator;

Absorption refrigeration device, including a generator for concentrating a third working medium, a third condenser, a first throttle valve, a second throttle valve, a first condenser, a second condenser, a solution pump, and a liquid return pump and absorbers;

The first outlet of the generator is connected to the first inlet of the third condenser, and the first outlet of the third condenser is connected to the first condenser and the third condenser respectively through the first throttle valve and the second throttle valve. Two condenser connections;

The second outlet of the first condenser is connected with the first inlet of the absorber; the first outlet of the second condenser is connected with the second inlet of the absorber;

The outlet of the working medium of the absorber is connected to the inlet of the generator, and the second outlet of the generator is connected to the third inlet of the absorber.

In the medium and low temperature geothermal ORC maglev composite cascade power generation system, wherein the first-level ORC generator set further includes a first cooling mechanism connected to the first-level generator and the second-level evaporator, respectively.

In the medium and low temperature geothermal ORC maglev composite cascade power generation system, wherein the two-level ORC generator set further includes a second cooling mechanism respectively connected to the two-level generator and the second condenser.

In the medium and low temperature geothermal ORC magnetic levitation composite cascade power generation system, wherein the first condenser and/or the second condenser includes a condenser coil and a shower for cooling the condenser coil.

In the medium and low temperature geothermal ORC magnetic levitation composite cascade power generation system, a throttle valve is provided between the third condenser, the first condenser and the second condenser.

In the medium and low temperature geothermal ORC magnetic levitation composite cascade power generation system, the third working fluid is a binary working fluid.

In the medium and low temperature geothermal ORC maglev composite cascade power generation system, wherein the primary generator and the secondary generator are both maglev turbine generators.

In the medium and low temperature geothermal ORC magnetic levitation composite cascade power generation system, the boiling point of the first working fluid is higher than the boiling point of the second working fluid.

In the medium and low temperature geothermal ORC maglev composite cascade power generation system, wherein the first cooling mechanism includes a first-stage turbine and an impeller connected to the first-stage turbine.

In the medium and low temperature geothermal ORC magnetic levitation composite cascade power generation method, wherein the second cooling mechanism includes a second stage turbine and an impeller connected to the second stage turbine.

Beneficial effects: The medium and low temperature geothermal ORC maglev composite cascade power generation system provided by the utility model has three working cycles by combining residual pressure cascade utilization, working medium cascade utilization and geothermal heat source cascade utilization. Effectively improve the heat utilization efficiency, improve the geothermal power generation efficiency and total power generation.

Description of drawings

FIG. 1 is a block diagram of the first medium and low temperature geothermal ORC magnetic levitation composite cascade power generation system provided by an embodiment of the present invention.

Fig. 2 is a block diagram of a second medium and low temperature geothermal ORC maglev composite cascade power generation system provided by an embodiment of the present invention.

FIG. 3 is a block diagram of a third medium and low temperature geothermal ORC maglev composite cascade power generation system provided by an embodiment of the present invention.

4 is a block diagram of a fourth medium and low temperature geothermal ORC maglev composite cascade power generation system provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clear and definite, the present utility model is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

As shown in FIG. 1 , the medium and low temperature geothermal ORC maglev composite cascade power generation system disclosed by the present utility model includes an ORC generator set for power generation and an absorption refrigeration device, and the ORC generator set includes two groups, that is, a first-level ORC generator set. and a secondary ORC generator set, wherein the primary ORC generator set includes a primary evaporator 10 , a primary generator 101 connected to the primary evaporator 10 , and a secondary generator 101 connected to the primary generator 101 The evaporator 20, the first-stage generator 101 is a maglev turbine generator. The first condensers 102 are respectively connected to the secondary evaporator 20 and the primary evaporator 10 .

Specifically, the power generation process of the first-stage ORC generator set involves the first-stage organic Rankine cycle, that is, the medium and low temperature geothermal water passes through the first-stage evaporator 10, so that the first working medium passing through the first-stage evaporator absorbs heat and evaporates, High-temperature and high-pressure steam is formed, and the high-temperature and high-pressure steam enters the first-stage magnetic levitation turbine generator 101 to expand and do work to drive the first-stage magnetic levitation generator to generate electricity. The Ken cycle provides heat, and after cooling, the first working fluid continues to release heat through the first condenser 102 to further reduce the condensation temperature of the working fluid, and returns to the primary evaporator 10 through the first working fluid pump 105 .

The secondary ORC generator set includes a secondary evaporator 20 for evaporating the second working medium, a secondary generator 201 connected to the secondary evaporator 20 , and a second generator 201 connected to the secondary generator 201 . The second condenser 202 is the second working fluid pump 205 connected to the second condenser 202 and the second stage evaporator 20 respectively; the second stage generator 201 is a magnetic levitation turbine generator.

Specifically, the secondary organic Rankine cycle, that is, the second organic working medium absorbs the heat energy in the exhausted steam discharged from the outlet of the primary magnetic levitation generator 101 in the secondary evaporator 20 and evaporates into the second organic working medium The steam, and then the second organic working medium steam with higher temperature and pressure enters the secondary maglev generator 201 to expand and do work to drive the secondary maglev generator to generate electricity, and the exhausted steam from the exit of the secondary maglev generator 201 enters the second condenser 202 After condensing, the liquid second organic working medium is finally condensed and returned to the secondary evaporator 20 through the second working medium pump 205 . By adding a secondary ORC generator set, the steam generated in the primary ORC generator set can be reused, which improves the heat utilization efficiency.

The absorption refrigeration device includes: a generator 30 for concentrating a third working medium, a third condenser 301, a first throttle valve 303, a second throttle valve 304, a first condenser 102, and a second condenser 202 and an absorber 302; the generator 30 holds a third working medium, and the third working medium is a binary mixed working medium.

The first outlet of the generator 30 is connected to the first inlet of the third condenser 301, and the first outlet of the third condenser 301 is connected to the first throttle valve 303 and the second throttle valve 304 respectively. A condenser 102 and a second condenser 202 are connected;

The second outlet of the first condenser 102 is connected to the first inlet of the absorber 302; the second outlet of the second condenser 202 is connected to the second inlet of the absorber 302;

The working fluid outlet of the absorber 302 is connected to the inlet of the generator 30 , and the second outlet of the generator 30 is connected to the third inlet of the absorber 302 .

It should be noted that the above-mentioned "first outlet", "first inlet", "second outlet", "second inlet", and "third inlet" are only for the convenience of expression and are not intended to be limiting, nor has no special meaning.

Specifically, the absorption refrigeration device involves an absorption refrigeration cycle in operation, that is, the third working fluid, as a refrigeration solution, contains two components with different boiling points, wherein the low-boiling working fluid absorbs in the generator 30 from The heat of the geothermal water with higher residual temperature discharged from the primary evaporator 10 is evaporated and then absorbed by the natural cooling water in the third condenser to be liquefied, and the liquefied working fluid (low boiling point) flows out through the first outlet The third condenser enters the first condenser 102 and the second condenser 202 respectively after being split by the first throttle valve 303 and the second throttle valve 304 and depressurized. Driven by the spray pump 203, the liquid working medium is atomized and sprayed to the first condenser pipe 104 arranged in the first condenser 102 and the second condenser pipe 204 arranged in the second condenser 202 to continue evaporative cooling, thereby The condensation temperatures of the first working fluid and the second working fluid are respectively reduced, and the steam from the first condenser and the second condenser outlet enters the generator 302 through the first inlet and the second inlet of the absorber respectively, and the generator 30 The remaining concentrated solution of the high-concentration third working fluid enters the absorber 302 through the third inlet, (the steam and the high-concentration solution enter the absorber at the same time) the steam is absorbed by the high-concentration solution, and the diluted solution is returned to the liquid return pump 305. generator 30. The concentrated solution of the high-concentration third working fluid is pumped into the absorber through the solution pump 306 . By using the cold energy obtained by adsorption refrigeration to further reduce the working fluid temperature of the ORC generator set, the comprehensive utilization rate of low and medium geothermal heat is improved.

Referring to FIG. 2 , in some embodiments, the primary ORC generator set further includes a first cooling mechanism connected to the primary generator and the secondary evaporator, respectively. The first cooling mechanism includes a first-stage turbine and an impeller connected to the first-stage turbine.

Specifically, the geothermal water passes through the first-stage evaporator 10, so that the first working medium passing through the first-stage evaporator 10 absorbs heat and evaporates to form high-temperature and high-pressure steam. The high-temperature and high-pressure steam enters the first-stage magnetic levitation turbine generator 101, The first-stage magnetic levitation turbine generator 101 has two-stage turbines, in which the gaseous working medium does work in the first-stage turbine, and drives the first-stage magnetic levitation turbine-generator to generate electricity through the coupling, and the generated gaseous working medium enters the first and second stage. The work done by the first-stage turbo expansion drives the impeller to rotate through the coupling, forcing the surrounding air to flow at an accelerated rate, strengthening the heat exchange of the condenser tube in the first condenser 20, and the exhausted steam at the outlet of the first-stage magnetic levitation generator then enters the second-stage evaporator 20 for heat exchange and cooling And provide heat for the secondary organic Rankine cycle, after cooling, the primary working fluid continues to release heat through the first condenser 102 to further reduce the condensation temperature of the working fluid, and finally returns to the primary evaporator 10 through the first working fluid pump 105 .

Referring to FIG. 3 , in some embodiments, the two-stage ORC generator set further includes a second cooling mechanism connected to the two-stage generator and the second condenser, respectively. The second cooling mechanism includes a second stage turbine and an impeller connected to the second stage turbine.

Specifically, the second organic working medium absorbs the heat energy in the exhausted steam discharged from the outlet of the first-stage magnetic levitation generator 101 in the secondary evaporator 20 and evaporates into the second organic working medium steam, and then the steam with higher temperature and pressure is evaporated. The second organic working medium steam enters the second-stage maglev generator 201, and the second-stage maglev turbine generator 201 has two-stage turbines, wherein the gaseous working medium does work in the first-stage turbine, and drives the second-stage magnetic levitation turbine through the coupling. The flat generator generates power, and the gaseous working medium after power generation enters the second stage of turbo expansion to do work, and drives the impeller to rotate through the coupling, forcing the surrounding air to accelerate the flow, strengthening the heat exchange of the condenser tube in the second condenser 202, and the second stage maglev power generation. The exhausted steam from the outlet of the generator 201 enters the second condenser 202 for condensation, and after the final condensation, the liquid second organic working medium is returned to the secondary evaporator 20 through the second working medium pump 205 . By adding a secondary ORC generator set, the steam generated in the primary ORC generator set can be reused, which improves the heat utilization efficiency.

Further, the first cooling mechanism and the second cooling mechanism may be simultaneously provided in the primary ORC generator set and the secondary ORC generator set, respectively. That is, the medium and low temperature geothermal ORC magnetic levitation composite cascade power generation system may include the first cooling mechanism and the second cooling mechanism at the same time, as shown in FIG. 4 .

It should be noted that the above three cycles do not operate in isolation, but are coupled and connected with each other. The secondary evaporator is not only the condenser of the primary organic Rankine cycle, but also the evaporator of the secondary organic Rankine cycle. The heat of the waste-temperature and exhausted steam continues to be used for power generation, which improves the utilization rate of medium and low temperature geothermal energy, thereby improving the power generation efficiency and increasing the power generation. The first condenser and the second condenser in the absorption refrigeration cycle are respectively arranged with a first condenser tube and a second condenser tube to realize the connection between the absorption refrigeration and the power generation cycle. It is used to reduce the condensation temperature and condensation pressure of the organic Rankine cycle, thereby increasing the pressure difference between the inlet and outlet of the maglev generator, increasing the power generation of the generator, thereby increasing the power generation and improving the utilization efficiency of medium and low temperature geothermal energy.

In summary, the present utility model provides a medium and low temperature geothermal ORC maglev composite cascade power generation system. The medium and low temperature geothermal ORC maglev composite cascade power generation system includes an ORC generator set and an absorption refrigeration device. The ORC generates electricity. The units include a primary ORC generator set and a secondary ORC generator set. The medium and low temperature geothermal water of the utility model sequentially passes through the evaporator of the first-stage organic Rankine cycle and the generator of absorption refrigeration. In the absorption refrigeration generator, the heat obtained from the residual temperature geothermal water discharged from the evaporator of the first-stage organic Rankine cycle is used for absorption refrigeration to improve the power generation cycle efficiency and realize the cascade utilization of geothermal energy.

The turbogenerator in the present invention is not a traditional turbogenerator, but a maglev turbogenerator, which is referred to as a maglev generator in this text. The magnetic levitation generator uses a magnetic levitation bearing, and the rotor and the bearing do not contact each other, so the mechanical friction is small, and the speed of the generator is high, thereby improving the power generation efficiency. The steam turbine part of the magnetic levitation generator in the utility model has two-stage turbines, and the gaseous working medium performs one expansion and work in the two-stage turbines, wherein the first-stage turbine drives the generator to generate electricity through the coupling; the second-stage turbine passes through the coupling. It drives the impeller to rotate, accelerates the air flow on the surface of the condensing pipe, strengthens the heat exchange capacity of the condensing pipe, reduces the condensing temperature and condensing pressure, thus increases the pressure difference between the inlet and outlet of the maglev generator, improves the power generation efficiency of the maglev generator, and increases the power generation and improve the utilization efficiency of medium and low temperature geothermal energy.

It should be understood that the application of the present invention is not limited to the above-mentioned examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above descriptions. All these improvements and transformations should belong to the protection of the appended claims of the present invention. scope.

Claims (9)

1. Middle and low temperature geothermol power ORC magnetic suspension compound step power generation system, its characterized in that includes:

the ORC generator set comprises a first-stage ORC generator set and a second-stage ORC generator set;

the first-stage ORC generator set comprises a first-stage evaporator used for evaporating a first working medium, a first-stage generator connected with the first-stage evaporator, a second-stage evaporator connected with the first-stage generator and used for evaporating a second working medium, a first condenser connected with the second-stage evaporator, and a first working medium pump respectively connected with the first condenser and the first-stage evaporator;

the two-stage ORC generator set comprises a two-stage evaporator used for evaporating a second working medium, a two-stage generator connected with the two-stage evaporator, a second condenser connected with the two-stage generator, and a second working medium pump respectively connected with the second condenser and the two-stage evaporator;

the absorption refrigeration device comprises a generator for concentrating a third working medium, a third condenser, a first throttle valve, a second throttle valve, a first condenser, a second condenser, a solution pump, a liquid return pump and an absorber;

the first outlet of the generator is connected with the first inlet of the third condenser, and the first outlet of the third condenser is respectively connected with the first condenser and the second condenser through the first throttling valve and the second throttling valve;

the second outlet of the first condenser is connected with the first inlet of the absorber; the second working medium outlet of the second condenser is connected with the second inlet of the absorber;

the absorber working medium outlet is connected with the generator inlet, and the second generator outlet is connected with the third absorber inlet.

2. The medium and low temperature geothermal ORC magnetic levitation compound step power generation system according to claim 1, wherein the primary ORC generator set further comprises a first cooling mechanism connected to the primary generator and the secondary evaporator, respectively.

3. The medium and low temperature geothermal ORC magnetic levitation compound step power generation system according to claim 1 or 2, wherein the secondary ORC generator set further comprises a second cooling mechanism connected to the secondary generator and the second condenser, respectively.

4. The medium and low temperature geothermal ORC magnetic levitation compound step power generation system according to claim 1, wherein the first condenser and/or the second condenser comprises a condensing coil and a sprinkler for cooling the condensing coil.

5. The medium and low temperature geothermal ORC magnetic levitation compound step power generation system according to claim 1, wherein a throttle valve is disposed between the third condenser and each of the first condenser and the second condenser.

6. The medium and low temperature geothermal ORC magnetic levitation composite cascade power generation system of claim 1, wherein the primary generator and the secondary generator are both magnetic levitation turbine generators.

7. The medium and low temperature geothermal ORC magnetic levitation composite cascade power generation system of claim 1, wherein the boiling point of the first working fluid is higher than the boiling point of the second working fluid.

8. The medium and low temperature geothermal ORC magnetic levitation compound step power generation system according to claim 2, wherein the first temperature reduction mechanism comprises a first secondary turbine, an impeller coupled to the first secondary turbine.

9. The medium and low temperature geothermal ORC magnetic levitation compound step power generation system according to claim 3, wherein the second temperature reduction mechanism comprises a second two-stage turbine, an impeller coupled to the second two-stage turbine.

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