CN108252743B - Full-flow circulating power generation device for geothermal energy - Google Patents
Full-flow circulating power generation device for geothermal energy Download PDFInfo
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- CN108252743B CN108252743B CN201810057334.0A CN201810057334A CN108252743B CN 108252743 B CN108252743 B CN 108252743B CN 201810057334 A CN201810057334 A CN 201810057334A CN 108252743 B CN108252743 B CN 108252743B
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- 238000010248 power generation Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 230000001360 synchronised effect Effects 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 33
- 239000000203 mixture Substances 0.000 claims description 20
- 229920006395 saturated elastomer Polymers 0.000 claims description 15
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 239000012808 vapor phase Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 11
- 239000012071 phase Substances 0.000 description 8
- 239000011295 pitch Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
- F01C1/12—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
- F01C1/14—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F01C1/16—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C13/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C13/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01C13/04—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby for driving pumps or compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/08—Rotary pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/04—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using pressure differences or thermal differences occurring in nature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/20—Rotors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a full-flow circulation power generation device for geothermal energy, which consists of a first valve (1), a preprocessor (2), a second valve (3), a double-screw expander (4) with a large expansion ratio, a first coupler (5), a second coupler (6), a third valve (7), a negative pressure condenser (8), a fourth valve (9), a water pump (10), a fifth valve (11), a double-screw vacuum pump (12), a pair of synchronous gears (13), a third coupler (14) and a generator (15); a double-screw expander (4) with a large expansion ratio is adopted for full-flow circulation, and a screw rotor has the characteristics of variable pitch and cone shape; the double-screw expander (4), the double-screw vacuum pump (12) and the generator (15) with large expansion ratio are coaxially connected in series; the heat energy utilization rate of the device is improved, and the whole power generation device has the advantages of compact structure, dry oil-free performance and uniform moment change.
Description
Technical Field
The invention relates to a power generation device for geothermal energy, in particular to a power generation device adopting a full-flow double-screw expander with a large expansion ratio and a double-screw vacuum pump.
Background
Geothermal energy refers to heat stored underground by taking rock or fluid as a carrier, has abundant reserves, is clean and low in pollution, and is an ideal renewable energy source for power generation; geothermal energy power generation can be divided into geothermal water power generation, geothermal wet steam power generation and geothermal dry steam power generation. The geothermal resource of China is mainly medium and low temperature type; in the low enthalpy energy utilization, the screw expander has great advantages as a gas-liquid two-phase full-flow power machine, and has high efficiency and self-cleaning and descaling capabilities suitable for steam-water two-phase working media.
Chinese patent publication No. CN206129323U discloses a twin screw expander for low temperature waste heat recovery system; the double-screw expander of the device is characterized in that: the screw rotors of the double-screw expander have equal screw pitches, the end surface molded lines of all sections along the axial position are unchanged, the area utilization coefficient is unchanged, the inter-tooth volume change is not enough, and the expansion ratio is small.
In order to maximally utilize the heat energy contained in the gas phase and the liquid phase in the geothermal energy and improve the utilization rate of the heat energy, the mixture of the gas phase and the liquid phase is fully expanded to the gas phase by adopting full-flow circulation, so that the heat energy contained in the gas phase and the liquid phase in the geothermal energy can be maximally utilized. But achieving full flow circulation requires an expander with a large expansion ratio; therefore, it is important to study a twin screw expander having a large expansion ratio and to realize full flow circulation.
Disclosure of Invention
In order to improve the heat energy utilization rate of geothermal energy and realize full-flow circulation, the invention provides a full-flow circulation power generation device for geothermal energy, which adopts a double-screw expander (4) with a large expansion ratio to perform full-flow circulation to fully expand a gas phase and liquid phase mixture into a gas phase; the double-screw expander (4) with a large expansion ratio adopts a screw rotor with a variable pitch and a cone shape; condensing the water vapor to liquid water by adopting a negative pressure condenser (8); a double-screw vacuum pump is adopted to maintain the negative pressure in the negative pressure condenser (8) and the noncondensable gas in the negative pressure condenser is pumped out; the double-screw expander (4) with a large expansion ratio, the double-screw vacuum pump (12) and the generator (15) are coaxially connected in series.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the full-flow circulation power generation device for geothermal energy consists of a first valve (1), a preprocessor (2), a second valve (3), a double-screw expander (4) with a large expansion ratio, a first coupler (5), a second coupler (6), a third valve (7), a negative pressure condenser (8), a fourth valve (9), a water pump (10), a fifth valve (11), a double-screw vacuum pump (12), a pair of synchronous gears (13), a third coupler (14) and a generator (15); geothermal water and steam generated by the geothermal well pass through a first valve (1) and enter a preprocessor (2) to remove impurities, and then become a saturated vapor-liquid mixture; the saturated vapor-liquid mixture enters a double-screw expander (4) with a large expansion ratio to be subjected to full-flow expansion, the full-vapor phase vapor is changed into full-vapor-phase vapor after expansion, the full-vapor-phase vapor flows out from an outlet of the double-screw expander (4) with the large expansion ratio and enters a negative pressure condenser (8) to be subjected to isobaric condensation, the full-vapor-liquid mixture is condensed into liquid water, a double-screw vacuum pump (12) extracts noncondensable gas in the negative pressure condenser (8) so that the negative pressure condenser (8) keeps constant vacuum degree, and the liquid water is extracted from the negative pressure condenser (8) by a water pump (10); in the working process, the double-screw expander (4) with a large expansion ratio drives the double-screw vacuum pump (12) and the generator (15) to rotate together to generate electricity.
The full-flow circulation power generation device for geothermal energy comprises the following gas-liquid volume ratio range of saturated gas-liquid mixture pretreated by a preprocessor (2): 90% -99.9%; the expansion ratio range of the saturated vapor-liquid mixture entering a double-screw expander (4) with a large expansion ratio for full-flow expansion is as follows: 20-25 parts; the temperature range of the saturated vapor-liquid mixture at the inlet of the double-screw expander (4) with a large expansion ratio is as follows: the temperature is 95-100 ℃, and the pressure range is as follows: 84.56 to 101.13kPa; the temperature range of water vapor at the outlet of the double-screw expander (4) with large expansion ratio is 25-30 ℃ and the pressure range is 3.23-4.24 kPa; the temperature range of the liquid water condensed by the negative pressure condenser (8) is 20-25 ℃, and the vacuum degree of the negative pressure condenser (8) is 3.23-4.24 kPa.
The full-flow circulation power generation device for geothermal energy is characterized in that a double-screw expander (4) with a large expansion ratio consists of a right-handed conical screw rotor (401) and a left-handed conical screw rotor (402), wherein the right-handed conical screw rotor (401) is screwed from an inlet high-pressure end to an outlet low-pressure endDistance gradually increases, tooth top radius R 1 With linear increase of axial position, root radius R 3 As the axial position decreases linearly with the same proportion, R 1 +R 3 The numerical value is unchanged; the left-hand conical screw rotor (402) and the right-hand conical screw rotor (401) can be completely meshed; the double-screw vacuum pump (12) consists of a left-handed screw rotor (1201) and a right-handed screw rotor (1202), wherein the pitch of the left-handed screw rotor (1201) gradually decreases from an inlet low-pressure end to an outlet high-pressure end; center distance A of left-handed screw rotor (1201) and right-handed screw rotor (1202) of twin-screw vacuum pump (12) 2 And the center distance A of the right-hand conical screw rotor (401) and the left-hand conical screw rotor (402) of the double-screw expander (4) with large expansion ratio 1 The same applies.
The full-flow circulation power generation device for geothermal energy is characterized in that a right-handed conical screw rotor (401) of a double-screw expander (4) with a large expansion ratio is connected with a left-handed screw rotor (1201) of a double-screw vacuum pump (12) through a first coupling (5), and the center lines of the axes are coincident; the left-handed conical screw rotor (402) of the double-screw expander (4) with a large expansion ratio is connected with the right-handed screw rotor (1202) of the double-screw vacuum pump (12) through a second coupling (6), and the center lines of the axes are coincident; the left-handed screw rotor (1201) and the right-handed screw rotor (1202) of the double-screw vacuum pump (12) are connected with a pair of synchronous gears (13); the left-handed screw rotor (1201) of the twin-screw vacuum pump (12) is connected with the generator (15) through the third coupling (14), and the center lines of the axes are coincident.
The beneficial effects of the invention are as follows:
(1) the full-flow circulation power generation device for geothermal energy realizes the full-flow expansion process of vapor and liquid, and maximally utilizes the thermal energy in the geothermal energy.
(2) The double-screw expander (4) with large expansion ratio is adopted, the volume between the low-pressure side teeth of the exhaust end is maximum, the volume between the high-pressure side teeth of the suction end is minimum, the large expansion ratio can be realized, and the heat energy utilization rate of the device is further improved.
(3) The double-screw expander (4), the double-screw vacuum pump (12) and the generator (15) with large expansion ratio are coaxially connected in series, and the whole power generation device has the advantages of compact structure, dry oil-free, high power generation cycle efficiency and stable operation.
(4) The double-screw expander (4) and the double-screw vacuum pump (12) with large expansion ratio are provided with a plurality of working cavities, the operation is stable, the output moment is uniform, and meanwhile, the balance of the rotation inertia force of the shafting rotor is facilitated.
(5) The low pressure sides of the double screw expander (4) and the double screw vacuum pump (12) with large expansion ratio are distributed at the middle position, the high pressure sides of the double screw expander are distributed at the two ends, and the high pressure and the low pressure are distributed reasonably, so that the axial forces of the gases born by the screw rotors of each group are balanced, and the shaft end sealing is facilitated.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a full flow cycle power plant for geothermal energy.
Fig. 2 is a schematic view of the screw rotors of a twin screw expander (4) having a large expansion ratio.
Fig. 3 is a schematic view of the screw rotors of the twin screw vacuum pump (12).
In the figure: 1-a first valve; 2-a preprocessor; 3-a second valve; 4-a twin screw expander with a large expansion ratio; 5-a first coupling; 6-a second coupling; 7-a third valve; 8-a negative pressure condenser; 9-a fourth valve; 10-a water pump; 11-a fifth valve; 12-a twin screw vacuum pump; 13-a pair of synchronizing gears; 14-a third coupling; 15-a generator; 401-right-hand conical screw rotor of a twin-screw expander with large expansion ratio; 402-a left-hand conical screw rotor of a twin screw expander having a large expansion ratio; 1201—left-hand screw rotor of twin-screw vacuum pump; 1202-right-hand screw rotor of twin-screw vacuum pump.
Detailed Description
The schematic diagram of a full-flow circulation power generation device for geothermal energy is shown in fig. 1, and the power generation device is composed of a first valve (1), a preprocessor (2), a second valve (3), a double-screw expander (4) with a large expansion ratio, a first coupler (5), a second coupler (6), a third valve (7), a negative pressure condenser (8), a fourth valve (9), a water pump (10), a fifth valve (11), a double-screw vacuum pump (12), a pair of synchronous gears (13), a third coupler (14) and a generator (15); the working process is as follows: geothermal water and steam generated by the geothermal well pass through a first valve (1) and enter a preprocessor (2) to remove impurities, and then become a saturated vapor-liquid mixture; the saturated vapor-liquid mixture enters a double-screw expander (4) with a large expansion ratio to be subjected to full-flow expansion, the full-vapor phase vapor is changed into full-vapor-phase vapor after expansion, the full-vapor-phase vapor flows out from an outlet of the double-screw expander (4) with the large expansion ratio and enters a negative pressure condenser (8) to be subjected to isobaric condensation, the full-vapor-liquid mixture is condensed into liquid water, a double-screw vacuum pump (12) extracts noncondensable gas in the negative pressure condenser (8) so that the negative pressure condenser (8) keeps constant vacuum degree, and the liquid water is extracted from the negative pressure condenser (8) by a water pump (10); in the working process, the double-screw expander (4) with a large expansion ratio drives the double-screw vacuum pump (12) and the generator (15) to rotate together to generate electricity.
The volume ratio range of the gas to liquid of the saturated gas-liquid mixture pretreated by the preprocessor (2) is as follows: <10%; the expansion ratio range of the saturated vapor-liquid mixture entering a double-screw expander (4) with a large expansion ratio for full-flow expansion is as follows: 20-25 parts; the temperature range of the saturated vapor-liquid mixture at the inlet of the double-screw expander (4) with a large expansion ratio is as follows: the temperature is 95-100 ℃, and the pressure range is as follows: 84.56 to 101.13kPa; the temperature range of water vapor at the outlet of the double-screw expander (4) with large expansion ratio is 25-30 ℃ and the pressure range is 3.23-4.24 kPa; the temperature range of the liquid water condensed by the negative pressure condenser (8) is 20-25 ℃, and the vacuum degree of the negative pressure condenser (8) is 3.23-4.24 kPa.
The screw rotor is set to rotate to the right direction from the low pressure side to the high pressure side according to the right hand screw rule, otherwise, the screw rotor is set to rotate to the left direction, a right-hand conical screw rotor (401) of the double-screw expander (4) with a large expansion ratio is connected with a left-hand screw rotor (1201) of the double-screw vacuum pump (12) through a first coupling (5), and the center line of the axes is coincident; the left-handed conical screw rotor (402) of the double-screw expander (4) with a large expansion ratio is connected with the right-handed screw rotor (1202) of the double-screw vacuum pump (12) through a second coupling (6), and the center lines of the axes are coincident; the left-handed screw rotor (1201) and the right-handed screw rotor (1202) of the double-screw vacuum pump (12) are connected with a pair of synchronous gears (13); the left-handed screw rotor (1201) of the twin-screw vacuum pump (12) is connected with the generator (15) through the third coupling (14), and the center lines of the axes are coincident.
As shown in the screw rotor schematic diagram of the double screw expander (4) with large expansion ratio in fig. 2, the double screw expander (4) with large expansion ratio is composed of a right-hand conical screw rotor (401) and a left-hand conical screw rotor (402), the pitch of the right-hand conical screw rotor (401) gradually increases from an inlet high-pressure end to an outlet low-pressure end, and the tip radius R 1 With linear increase of axial position, root radius R 3 As the axial position decreases linearly with the same proportion, R 1 +R 3 The numerical value is unchanged; the left-hand conical screw rotor (402) and the right-hand conical screw rotor (401) can be completely meshed.
As shown in the screw rotor schematic diagram of the twin-screw vacuum pump (12) in fig. 3, the twin-screw vacuum pump (12) is composed of a left-handed screw rotor (1201) and a right-handed screw rotor (1202), and the pitch of the left-handed screw rotor (1201) gradually decreases from an inlet low-pressure end to an outlet high-pressure end; center distance A of left-handed screw rotor (1201) and right-handed screw rotor (1202) of twin-screw vacuum pump (12) 2 And the center distance A of the right-hand conical screw rotor (401) and the left-hand conical screw rotor (402) of the double-screw expander (4) with large expansion ratio 1 The same applies.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (2)
1. The full-flow circulation power generation device for geothermal energy consists of a first valve (1), a preprocessor (2), a second valve (3), a double-screw expander (4) with a large expansion ratio, a first coupler (5), a second coupler (6), a third valve (7), a negative pressure condenser (8), a fourth valve (9), a water pump (10), a fifth valve (11), a double-screw vacuum pump (12), a pair of synchronous gears (13), a third coupler (14) and a generator (15); the method is characterized in that: geothermal water and steam generated by the geothermal well pass through a first valve (1) and enter a preprocessor (2) to remove impurities, and then become a saturated vapor-liquid mixture; the saturated vapor-liquid mixture enters a double-screw expander (4) with a large expansion ratio to be subjected to full-flow expansion, the full-vapor phase vapor is changed into full-vapor-phase vapor after expansion, the full-vapor-phase vapor flows out from an outlet of the double-screw expander (4) with the large expansion ratio and enters a negative pressure condenser (8) to be subjected to isobaric condensation, the full-vapor-liquid mixture is condensed into liquid water, a double-screw vacuum pump (12) extracts noncondensable gas in the negative pressure condenser (8) so that the negative pressure condenser (8) keeps constant vacuum degree, and the liquid water is extracted from the negative pressure condenser (8) by a water pump (10); in the working process, the double-screw expander (4) with a large expansion ratio drives the double-screw vacuum pump (12) and the generator (15) to rotate together to generate electricity;
the volume ratio range of the gas to liquid of the saturated gas-liquid mixture pretreated by the preprocessor (2) is as follows: 90% -99.9%; the expansion ratio range of the saturated vapor-liquid mixture entering a double-screw expander (4) with a large expansion ratio for full-flow expansion is as follows: 20-25 parts of a base; the temperature range of the saturated vapor-liquid mixture at the inlet of the double-screw expander (4) with a large expansion ratio is as follows: the temperature is 95-100 ℃, and the pressure range is as follows: 84.56-101.13 kPa; the temperature range of water vapor at the outlet of the double-screw expander (4) with a large expansion ratio is 25-30 ℃, and the pressure range is 3.23-4.24 kPa; the temperature range of the liquid water condensed by the negative pressure condenser (8) is 20-25 ℃, and the vacuum degree of the negative pressure condenser (8) is 3.23-4.24 kPa;
the double-screw expander (4) with large expansion ratio consists of a right-handed conical screw rotor (401) and a left-handed conical screw rotor (402), wherein the pitch of the right-handed conical screw rotor (401) is gradually increased from an inlet high-pressure end to an outlet low-pressure end, and the radius of a tooth tip circle is gradually increasedR 1 Linearly increasing with axial position, root radiusR 3 Linearly decreasing with the axial position in the same proportion,R 1 +R 3 the numerical value is unchanged; the left-hand conical screw rotor (402) and the right-hand conical screw rotor (401) can be completely meshed; the twin-screw vacuum pump (12) consists ofThe left-handed screw rotor (1201) and the right-handed screw rotor (1202) are formed, and the pitch of the left-handed screw rotor (1201) is gradually reduced from an inlet low-pressure end to an outlet high-pressure end; center distance between left-handed screw rotor (1201) and right-handed screw rotor (1202) of twin-screw vacuum pump (12)A 2 And the center distance of a right-hand conical screw rotor (401) and a left-hand conical screw rotor (402) of the double-screw expander (4) with a large expansion ratioA 1 The same applies.
2. A full-flow circulation power generation device for geothermal energy as defined in claim 1, wherein: the right-hand conical screw rotor (401) of the double-screw expander (4) with a large expansion ratio is connected with the left-hand screw rotor (1201) of the double-screw vacuum pump (12) through the first coupling (5), and the center lines of the axes are coincident; the left-handed conical screw rotor (402) of the double-screw expander (4) with a large expansion ratio is connected with the right-handed screw rotor (1202) of the double-screw vacuum pump (12) through a second coupling (6), and the center lines of the axes are coincident; the left-handed screw rotor (1201) and the right-handed screw rotor (1202) of the double-screw vacuum pump (12) are connected with a pair of synchronous gears (13); the left-handed screw rotor (1201) of the twin-screw vacuum pump (12) is connected with the generator (15) through the third coupling (14), and the center lines of the axes are coincident.
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