CN209761640U - Hot dry rock power generation system - Google Patents
Hot dry rock power generation system Download PDFInfo
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- CN209761640U CN209761640U CN201920302752.1U CN201920302752U CN209761640U CN 209761640 U CN209761640 U CN 209761640U CN 201920302752 U CN201920302752 U CN 201920302752U CN 209761640 U CN209761640 U CN 209761640U
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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
Abstract
The utility model discloses a hot dry rock power generation system, include: the system comprises a gas-liquid separator, a main power generation device, a first cooling device, a waste heat power generation device, a second cooling device and a water collector; the inlet of the gas-liquid separator is connected with the production well, the gas-phase outlet of the gas-liquid separator is connected with the water collector through the main power generation device and the first cooling device in sequence, and the liquid-phase outlet of the gas-liquid separator is connected with the water collector through the waste heat power generation device; the second cooling device is connected with the waste heat power generation device; the first cooling device and/or the second cooling device further comprise a water supplementing device of the hot dry rock power generation system. The utility model discloses a combine together power generation system's cooling flow and the moisturizing flow of dry and hot rock, both ensured condensing temperature, reduced the requirement to the cooling tower, again can fully retrieve the waste heat, avoid the waste of heat energy, improved the efficiency that the dry and hot rock system got heat.
Description
Technical Field
The utility model relates to a geothermal energy development field, more specifically relates to a dry and hot rock power generation system.
background
the dry-hot rock type geothermal resource is a clean renewable energy source with high competitiveness, and has the advantages of stability (not influenced by seasons and day and night changes), high utilization rate (the power generation utilization efficiency can exceed 73 percent, 5.2 times of solar photovoltaic power generation and 3.5 times of wind power generation), safety, low operation cost, comprehensive utilization (power generation, heating, bathing, cultivation, snow melting, urban hot water supply) and the like.
The scale of geothermal energy existing in the dry-hot rock is huge, the energy contained in the dry-hot rock (usually 3-10 km deep) in the crust is conservatively estimated to be 30 times of the energy contained in all global petroleum, natural gas and coal, and the dry-hot rock is a strategic replacement energy source with great development prospect. However, no hot dry rock power generation project is implemented in China at present, hot dry rock research is mainly focused on the previous resource exploration, fracturing engineering development and other parts, the hot dry rock power generation project is less researched, and although more researches are made on ORC power generation and full-flow power generation technologies in China, the design for optimizing the hot dry rock power generation is less.
The process of the dry hot rock geothermal power generation comprises the following steps: the injection well inputs low-temperature water into the heat storage reservoir, and after the low-temperature water is heated by the high-temperature rock mass, the low-temperature water is recovered and generated in the critical state in the form of high-temperature water and steam through the production well. And after power generation, cooling water is discharged into the injection well for recycling.
The cooling process is an indispensable ring in the power generation process, reduces the cooling temperature, and can effectively improve the efficiency of the power generation system, but the cooling systems adopted in the general power generation process all need to design a larger heat dissipation device, occupy a certain space, and are unfavorable for the system arrangement. In the dry hot rock power generation system, circulating fluid needs to be injected underground, a certain leakage rate (10% -30% and the Japanese elbow fold item is up to more than 70%) exists in the underground circulation process, and compared with a common energy power generation system, the dry hot rock power generation system has larger water supplement amount and space for further optimized utilization.
Therefore, it is expected to develop a new dry hot rock power generation system to optimize the dry hot rock power generation process.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a hot dry rock power generation system makes power generation system's cooling flow and moisturizing flow combine together.
In order to achieve the above object, the utility model provides a hot dry rock power generation system, include:
The system comprises a gas-liquid separator, a main power generation device, a first cooling device, a waste heat power generation device, a second cooling device and a water collector;
An inlet of the gas-liquid separator is connected with a production well, a gas-phase outlet of the gas-liquid separator is connected to the water collector sequentially through the main power generation device and the first cooling device, and a liquid-phase outlet of the gas-liquid separator is connected to the water collector through the waste heat power generation device;
The second cooling device is connected with the waste heat power generation device and is used for cooling the waste heat power generation device;
The first cooling device and/or the second cooling device comprise a water replenishing device of the hot dry rock power generation system.
Preferably, the system further comprises a water treatment circulation injection device, wherein the inlet of the water treatment circulation injection device is connected to the water collector, and the outlet of the water treatment circulation injection device is connected to the hot dry rock injection well.
As a preferred scheme, the waste heat power generation device comprises an ORC power generation unit, a flash evaporation power generation unit, a kalina power generation unit or a full-flow screw expander power generation unit.
preferably, the first cooling device comprises a condenser, and the second cooling device comprises a cooling tower.
Preferably, the water replenishing device of the hot dry rock power generation system and the second cooling device are connected with each other through a bypass.
Preferably, the main power generation device comprises a plurality of first power generation sets arranged in parallel, and/or the waste heat power generation device comprises a plurality of second power generation sets arranged in parallel.
Preferably, a first impurity separation device is arranged between the gas-liquid separator and the main power generation device, and/or a second impurity separation device is arranged between the gas-liquid separator and the waste heat power generation device.
Preferably, the first impurity separation apparatus and/or the second impurity separation apparatus includes a desander.
Preferably, the main power generation device comprises a steam turbine and a generator.
Preferably, the device further comprises a pressurizing pump, and the pressurizing pump is arranged at the outlet of the water treatment circulating injection device.
the beneficial effects of the utility model reside in that:
1. The method combines the water supplementing flow of the injection water indispensable for the dry hot rock power generation system with the cooling flow of the power generation system, reduces the requirements on a cooling tower by optimizing the flow, is favorable for field arrangement, effectively ensures the condensation temperature, and improves the generated energy of the system.
2. Can fully retrieve cooling device's heat, reinject the water that the water collector was collected to the water injection well, avoid the dissipation of energy extravagant, reach the effect that promotes the hot dry rock and get thermal cycle efficiency.
The apparatus of the present invention has other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments of the present invention with reference to the attached drawings, in which like reference numerals generally represent like parts.
fig. 1 shows a schematic view of a hot dry rock power generation system according to an embodiment of the present invention.
Description of reference numerals:
1, a production well; 2, a gas-liquid separator; 3, a steam turbine; 4, a generator; 5, a condenser; 6, a water replenishing device; 7, a water collector; 8, water treatment equipment; 9, cooling the tower; a 10ORC generator set; 11 an injection well; 12 a booster pump.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention have been illustrated in the accompanying drawings, it is to be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
According to the utility model discloses a hot rock power generation system includes: a gas-liquid separator, a main power generation device,
The system comprises a first cooling device, a waste heat power generation device, a second cooling device and a water collector;
The inlet of the gas-liquid separator is connected with the production well, the gas-phase outlet of the gas-liquid separator is connected with the water collector through the main power generation device and the first cooling device in sequence, and the liquid-phase outlet of the gas-liquid separator is connected with the water collector through the waste heat power generation device;
The second cooling device is connected with the waste heat power generation device and used for cooling the waste heat power generation device;
The first cooling device and/or the second cooling device comprise a water replenishing device of the hot dry rock power generation system.
Specifically, the system can be divided into 4 parts according to the process flow:
1. The fluid extraction and separation process comprises the steps of extracting geothermal fluid from a production well to the ground, and separating the geothermal fluid into gas-phase fluid and liquid-phase fluid through a gas-liquid separator.
2. And in the power generation process, the gas-phase fluid enters a main generator set, generates power through a generator and is transmitted to a user. And the liquid phase fluid enters the waste heat power generation device, generates power through the generator and is transmitted to the user.
3. And in the cooling and water supplementing process, the main generator set and the waste heat generator set adopt mutually independent cooling devices due to different flow rates. The main generator set is connected with the first cooling device, and the waste heat power generation device is connected with the second cooling device. The cooling flow is an indispensable part of the power generation process, the cooling temperature is reduced, and the efficiency of the power generation system can be effectively improved. Among the hot dry rock power generation system, the circulating fluid need pour into the underground into, and at the underground cycle in-process, there is certain leak rate, and energy power generation system general relatively, its moisturizing volume is great, needs the moisturizing device, the utility model discloses the cooling process water of power generation system combines together with the moisturizing of hot dry rock. The aim of water supplement is achieved while cooling, the process flow is optimized, and the requirement on a cooling device is lowered.
4. And in the collection process, condensed water generated by a cooling device of the main generator set and cooling water of the waste heat generator set are both connected into the water collector.
In one example, the hot dry rock power generation system further comprises a water treatment cycle injection device, wherein an inlet of the water treatment cycle injection device is connected to the water collector, and an outlet of the water treatment cycle injection device is connected to the hot dry rock injection well.
In one example, the dry hot rock power generation system further comprises a booster pump arranged at the outlet of the water treatment circulation injection device.
Specifically, in the hot dry rock power generation system, water can be injected into the ground, a certain leakage rate exists in the underground circulation process, and compared with a common energy power generation system, the water supplement amount is large. In an example, the water of injection water injection well acquires from the water collector, because the comdenstion water that the water collector was collected, has fully retrieved the heat of condenser, and the temperature is higher than normal atmospheric temperature water, reinjects it to the water injection well, has avoided thermal waste, has improved the efficiency that hot dry rock got the thermal cycle.
The comdenstion water in the water collector contains harmful substance such as oil, suspended solid, rust, if direct injection water injection well can lead to the fact the pollution for the pit, through addding water treatment facilities in an example, effectively reduced harmful substance's content, reduced the pollution degree, in addition, because the pressure that can make the well among the water injection process rises, for satisfying the requirement of water injection well pressure, add the force (forcing) pump, improved the input and the notes production pressure differential of well, adjust through the discharge valve simultaneously, conveniently adjust the water injection volume.
In one example, the waste heat power generation device includes an ORC generator set, a flash generator set, a kalina generator set, or a full flow screw expander generator set.
Specifically, cogeneration refers to a technology of converting redundant heat energy into electric energy in a production process. Because a large amount of medium-low temperature liquid fluid (about 150 ℃) exists in the power generation process of the hot dry rock, the liquid fluid is effectively utilized to generate power, the power generation efficiency of the hot dry rock can be improved, and the environmental protection is facilitated.
In one example, the first cooling device comprises a condenser and the second cooling device comprises a cooling tower.
In one example, the water replenishing device and the second cooling device of the hot dry rock power generation system are interconnected by a bypass.
Particularly, the operation of the generator set can not be separated from the cooling device, the selection of the cooling device needs to consider the treatment capacity, the cooling effect, the input cost, the installation place and the like, and because the hot dry rock power generation system needs to be supplemented with water, the cooling device adopting water as a cooling medium is selected, and the water supplemented water is combined with the cooling water, so that the process flow is simplified, the requirements on the cooling device (such as the cooling area of a cooling tower) are reduced, and the cooling effect is optimized. The first cooling device and the second cooling device are interconnected, so that the water consumption of the two cooling devices can be reasonably distributed, and when one cooling device breaks down, the other cooling device can play a standby role, and the normal operation of the power generation system is guaranteed.
In one example, the main power generation device comprises a plurality of first generator sets arranged in parallel, and/or the waste heat power generation device comprises a plurality of second generator sets arranged in parallel.
specifically, when the production amount of the geothermal fluid is large or the temperature change of the geothermal fluid is large (the temperature of the dry-hot rock is about 150-650 ℃), a plurality of first generator sets and second generator sets can be arranged. By adopting a parallel connection mode, the first generator set and the second generator set with proper quantity and type can be selected to be started or closed according to different mining quantities or different fluid temperatures, so that the utilization rate is effectively improved, and optimal configuration is achieved. Meanwhile, according to actual conditions, a plurality of generator sets of the same type or different types can share one cooling device or one generator set can use a plurality of cooling devices of the same type or different types. The cooling device may be other common cooling devices besides a condenser and a cooling tower.
in one example, a first impurity separation device is arranged between the gas-liquid separator and the main power generation device, and/or a second impurity separation device is arranged between the gas-liquid separator and the waste heat power generation device.
In one example, the first impurity separation device and/or the second impurity separation device comprises a desander.
when hot fluid is exploited from hot dry rock, a small amount of impurity particles (sand, pebble, coal slag and the like) can be generated, the mechanical equipment can be abraded due to the impurity particles, and the impurity separation equipment is additionally arranged behind the gas-liquid separator, so that the burden of a subsequent process equipment filter can be reduced, the frequency of replacing the filter is reduced, the working function of a generator set is improved, and the service life of the generator set is prolonged.
In one example, the primary power generation device includes a steam turbine and a generator.
The gas phase outlet of the gas-liquid separator is connected with the inlet of a steam turbine, the outlet of the steam turbine is connected with a generator, and the steam turbine takes steam as a working medium to convert heat energy into mechanical energy so as to provide mechanical energy for the generator to generate electricity.
Example (b):
FIG. 1 shows a schematic diagram of a hot dry rock power generation system according to one embodiment of the present invention.
The geothermal fluid is produced to the ground from a production well 1, and is firstly separated by a gas-liquid separator 2 and divided into gas phase and liquid phase: the vapor phase fluid is sent into a steam turbine 3 to be expanded and processed to drive a generator 4 to generate electricity, the exhaust steam enters a condenser 5 to be cooled in a steam-water mixed state, the condenser 5 is condensed by a hot dry rock system water replenishing device 6, and the generated condensed water and the cooling water are both connected into a water collector 7; b. liquid phase fluid enters an ORC generator set 10 for power generation, a cooling tower 9 is adopted for circular cooling (a water replenishing device of the cooling tower is not marked on the figure), the fluid enters a water collector 7 after being cooled, the water collector 7 is connected with a water treatment device 8 for fluid treatment, and the fluid enters a hot dry rock stratum through an injection well 11 after being pressurized by a pressurizing pump 12.
While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A hot dry rock power generation system, comprising: the system comprises a gas-liquid separator, a main power generation device, a first cooling device, a waste heat power generation device, a second cooling device and a water collector;
An inlet of the gas-liquid separator is connected with a production well, a gas-phase outlet of the gas-liquid separator is connected to the water collector sequentially through the main power generation device and the first cooling device, and a liquid-phase outlet of the gas-liquid separator is connected to the water collector through the waste heat power generation device;
The second cooling device is connected with the waste heat power generation device and is used for cooling the waste heat power generation device;
The first cooling device and/or the second cooling device comprise a water replenishing device of the hot dry rock power generation system.
2. The dry hot rock power generation system of claim 1, further comprising a water treatment cycle injection device having an inlet connected to the water collector and an outlet connected to a dry hot rock injection well.
3. The hot dry rock power generation system of claim 1, wherein the waste heat power generation device comprises an ORC generator set, a flash generator set, a kalina generator set, or a full-flow screw expander generator set.
4. The dry hot rock power generation system of claim 1, wherein the first cooling device comprises a condenser and a water replenishing device of the dry hot rock power generation system, and the second cooling device comprises a cooling tower.
5. The dry hot rock power generation system of claim 4, wherein the water replenishing device of the dry hot rock power generation system and the second cooling device are interconnected by a bypass.
6. A hot dry rock power generation system according to claim 1 wherein the main power generation means includes a plurality of first generator sets arranged in parallel and/or the waste heat power generation means includes a plurality of second generator sets arranged in parallel.
7. The dry hot rock power generation system of claim 1, wherein a first impurity separation device is disposed between the gas-liquid separator and the main power generation device, and/or a second impurity separation device is disposed between the gas-liquid separator and the waste heat power generation device.
8. The hot dry rock power generation system of claim 7, wherein the first impurity separation device and/or the second impurity separation device comprises a sand trap.
9. The dry hot rock power generation system of claim 1, wherein the primary power generation device comprises a steam turbine and a generator.
10. The dry hot rock power generation system of claim 2, further comprising a booster pump disposed at an outlet of the water treatment circuit injection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920302752.1U CN209761640U (en) | 2019-03-11 | 2019-03-11 | Hot dry rock power generation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920302752.1U CN209761640U (en) | 2019-03-11 | 2019-03-11 | Hot dry rock power generation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111306016B (en) * | 2020-03-18 | 2021-08-24 | 青海省环境地质勘查局 | Geothermal energy power generation system and method |
| CN114216276A (en) * | 2021-12-15 | 2022-03-22 | 国家能源投资集团有限责任公司 | Hot dry rock water circulating system |
-
2019
- 2019-03-11 CN CN201920302752.1U patent/CN209761640U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111306016B (en) * | 2020-03-18 | 2021-08-24 | 青海省环境地质勘查局 | Geothermal energy power generation system and method |
| CN114216276A (en) * | 2021-12-15 | 2022-03-22 | 国家能源投资集团有限责任公司 | Hot dry rock water circulating system |
| CN114216276B (en) * | 2021-12-15 | 2023-11-10 | 国家能源投资集团有限责任公司 | Dry and hot rock water circulation system |
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