KR20180073198A - Apparatus and method for deep depth high temperature geothermal circulation - Google Patents

Abstract

Provided is a deep depth geothermal water circulation method for smooth supply and circulation of high-temperature geothermal water in a deep tubular well having a deep depth. The method includes a production step of producing high-temperature geothermal water in a deep depth reservoir, a supply step of transferring the produced high-temperature geothermal water to an energy recovery facility, and an injection step of injecting the geothermal water used through the recovery facility into the deep depth reservoir. The method further includes a discharge step of discharging the geothermal water containing impurities during initial geothermal water production and blocking supply to the recovery facility, and a replenishment water injection step of injecting replenishment water to the reservoir during the geothermal water discharge in the discharge step.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a geothermal water circulation apparatus,

The present invention relates to a superheated geothermal water circulation device and a circulation method for circulating and supplying clean, high-temperature geothermal water to a geothermal power generation.

Generally, geothermal heat is created by the addition of heat generated by the continuous collapse of radioactive isotopes contained in the rocks that constitute the heat and crust of the earth from the time the earth is created. As the temperature goes up from the surface to the underground, it is known to rise to about 7,000 ° C in the center, and the earth actually has enormous geothermal energy.

Unlike new and renewable energy sources such as wind power and solar power, where geothermal energy does not blow up when it does not blow or rain, it can supply energy constantly from underground, so it can produce energy continuously throughout the year.

Geothermal energy is produced in the form of water vapor or geothermal water. Conventionally, the application range of geothermal energy such as utilization of geothermal energy of low temperature produced at low depth of about 100m to 500m underground has been limited due to use of heat pump for heating and cooling.

In the case of geothermal energy, it is possible to supply geothermal energy such as binary power and district heating by using geothermal water of 100 ℃ or more, which is generated at a depth of 1km or more in the ground, so that the application range of geothermal water is wide.

In this way, geothermal energy of large depth can be utilized more effectively because it can utilize geothermal water of high temperature as energy source as compared with low depth geothermal energy. However, technology for drilling technology and production and circulation of high temperature geothermal water Is required.

In addition, low-temperature geothermal water produced at low depths does not evaporate (evaporate) at atmospheric pressure, unlike high-temperature geothermal water. Because it uses low depth of field, In order to produce water, it is necessary to construct the plant considering the characteristics of vaporization at high pressure and atmospheric pressure.

The present invention provides a circulation method and circulation method of a superheated geothermal water capable of smoothly supplying and circulating high temperature geothermal water at a great depth of mind.

Also provided is a super highway geothermal water circulation system and a circulation method which are capable of removing impurities from high temperature geothermal water supplied from a large depth of field and supplying them to a power generation facility in a clean state.

In order to achieve this, the circulation apparatus of the present embodiment includes at least one production facility for generating high-temperature geothermal water from the underground storage tank, at least one injection well for injecting the used geothermal water into the underground storage tank, A recovery pipe for recovering heat energy and a supply pipe connected to the production pipe for transferring geothermal water, a production pump installed on the supply pipe for transferring geothermal water, a recovery device connected between the recovery device and the injection device, A geothermal water discharge unit connected to one side of the supply pipe for discharging the geothermal water mixed with the impurities to block the transfer to the recovery facility, And a replenishment water supply unit for supplying replenish water to the storage tank through the water return pipe.

The geothermal water discharge unit includes a water discharge pipe branched from the supply pipe to discharge geothermal water, a water discharge reservoir for receiving the geothermal water connected to and discharged from the water discharge pipe, a water discharge shutoff valve installed at one side of the discharge water pipe, And may include a supply shut-off valve that is installed.

The replenishment water supply unit may include a healing water storage tank containing the replenishing water, a pressure pipe connecting the replenishing water storage tank and the water return pipe to transfer the replenishing water to the water return pipe, and a pressure pump installed on the pressure pipe.

The replenishment water supply unit may further include a buffer tank installed on the pressurization pipe.

The production pump may be installed inside the production chamber.

And an infusion pump installed in the water return pipe for injecting geothermal water or makeup water into the infusion tank at a high pressure.

And a gas-liquid separator provided on the supply pipe and / or the return pipe for separating and removing gas from the geothermal water.

And a filter installed on the supply pipe and / or the return pipe to filter out impurities mixed into the geothermal water.

A bypass line connected between the supply pipe and the return pipe to bypass the geothermal water, a bypass valve installed in the bypass line, an inlet valve installed in the supply pipe and the return pipe between the bypass line and the recovery facility, And an outlet valve.

The recovery facility may be a binary geothermal power generation device that uses geothermal water as a heat source to produce electric power.

The circulation method of this embodiment includes a production stage for producing high-temperature geothermal water in a high-pressure reservoir, a supply stage for transferring produced high-temperature geothermal water to the energy recovery facility, and a geothermal water used for the high- The geothermal water circulating method may further include a discharging step of discharging geothermal water containing impurities during the initial production of the geothermal water to shut off supply to the recovery facility.

And a replenishing water injecting step of injecting the replenishing water into the storage tank when the geothermal water is discharged.

The injecting step may further include injecting the geothermal water by pressurizing.

The supplying step and / or the injecting step may further include a gas-liquid separating step for separating the gas from the geothermal water.

The supplying step and / or the supplying step may further include a filtering step of filtering impurities contained in the geothermal water.

The circulation method may further include bypassing the geothermal water to the recovery facility until the geothermal water circulation pressure and the flow rate are stabilized.

According to this embodiment as described above, it is possible to stably produce and circulate geothermal water at a high temperature from a depth of 1 km or more underground.

In addition, it is possible to prevent impurities such as gas mixed in the geothermal water from flowing into a recovery facility such as a power generation facility, protect the facility, and utilize the heat source of the geothermal water stably.

FIG. 1 is a schematic diagram showing a geothermal water circulation structure of a superficial geothermal water circulation apparatus according to the present embodiment.
FIG. 2 is a schematic view showing the geothermal water circulation structure at the initial stage of operation of the superficial geothermal water circulation apparatus according to the present embodiment.
3 illustrates the geothermal water heat energy recovery structure of the superficial geothermal water circulation apparatus according to the present embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that the embodiments described below may be modified in various ways without departing from the spirit and scope of the invention. But is not limited to the example.

The drawings are schematic and illustrate that they are not drawn to scale. The relative dimensions and ratios of the parts in the figures are shown exaggerated or reduced in size for clarity and convenience in the figures, and any dimensions are merely illustrative and not restrictive.

FIG. 1 shows the geothermal water circulation structure of the super high-altitude geothermal water circulation apparatus according to the present embodiment, and FIG. 2 shows the geothermal water circulation structure at the initial stage of the geothermal water circulation.

As shown in the figure, the circulation apparatus of the present embodiment includes a production facility 1 for producing high-temperature geothermal water from an underground storage tank 3 formed at a major axis of 1 km or more underground, a geothermal water used in an underground storage tank 3 (2) for recovering thermal energy of the geothermal water, a recovery pipe (40) for recovering the thermal energy of the geothermal water, a supply pipe (11) connected between the production pipe (1) A production pump 10 installed to transfer the geothermal water and a geothermal water which is connected between the recovery facility 40 and the injection well 2 through the recovery facility 40 to be discharged to the injection well 2 A geothermal water discharge unit connected to one side of the supply pipe 11 to discharge the geothermal water mixed with the impurities and to stop the transfer to the recovery facility 40 is connected to one side of the water return pipe 21, And a replenishment water supply section for supplying replenishment water to the storage tank 3 through the water return pipe 21 have.

The production tanks 1 are designed to produce geothermal water at a high temperature from the underground storage tank 3 where the geothermal water is heated to a high temperature. The production cell 1 may be composed of one or a plurality of cells.

The injection pellets 2 are produced separately from the production pellets 1 through the massive pellet production pellets 1 formed at a depth of 1 km or more and injected into the underground pellet 3 It is a feeling to do. The injection pads 2 may also be formed of one or more than one.

The supply pipe 11 connects the production pot 1 and the recovery facility 40 to supply the hot geothermal water to the recovery facility 40. The water return pipe 21 is connected between the recovery facility 40 and the injection well 2 and injects the used geothermal water into the injection well 2. [

The supply pipe 11 is provided with a production pump 10 for transferring the high temperature geothermal water in the production chamber 1 to the supply pipe. Geothermal water produced at depths of 1 km or more is vaporized (vaporized) at a high temperature of 100 ° C or higher and has a high vapor pressure. Therefore, in the present embodiment, the production pump 10 is structured to be installed in the production chamber 1. [ As the production pump 10 is disposed inside the production chamber 1, the suction side pressure can be applied so that the geothermal water is not vaporized (vaporized) through the water head pressure of the geothermal water. Thus, stable operation of the production pump 10 is assured.

The geothermal water is heated to a high temperature in the storage tank 3, is drawn out to the ground through the production column 1, is returned to the storage tank 3 after the energy is recovered in the recovery facility 40, and is continuously circulated.

The circulation apparatus of the present embodiment includes an injection pump 20 installed in the water return pipe 21 for injecting geothermal water or makeup water into the injection well 2 at a high pressure in order to stably circulate the geothermal water from the large depth of view, As shown in FIG.

The infusion pump 20 injects geothermal water or makeup water circulated and discharged to the infusion chamber 2 through the inflow water pipe 21 at a high pressure so that the infusion pipe 20 and the reservoir tank 3 Of the pressure loss of the pressure-reducing valve. It is also possible to prevent a decrease in the water level in the production chamber 1 due to the high pressure injection of the injection pump 20 and to keep the pressure on the suction side of the production pump 10 constant, Of the waste water can be supplied to the recovery facility 40 through the supply pipe 11.

Since the internal pressure loss due to the geothermal water circulation is very large in the case of large depth, the injection pump 20 is driven so that the pressure loss and the flow rate of the heart are constantly supplied and the constant flow rate can be supplied to the production pump 10 .

Therefore, it is possible to continuously and continuously produce geothermal water at a high temperature of 1 km or more at a constant pressure and temperature flow rate.

The circulation apparatus of the present embodiment includes the geothermal water discharging unit and the replenishing water supplying unit so that the geothermal heat water mixed with a lot of impurities during the initial production of the geothermal water can be prevented from being supplied to the recovering equipment 40. Impurities may refer to solid substances in the form of gas and granules, such as gases contained in geothermal water.

The geothermal water discharge unit includes a water discharge pipe 50 branched from the supply pipe 11 to discharge geothermal water, a water discharge reservoir 51 for receiving the geothermal water connected to the discharge side of the discharge water pipe 50, 50, and a supply shutoff valve 53 installed at one side of the supply pipe 11. The supply shutoff valve 52 is provided at one side of the supply pipe 11,

The supply shutoff valve 53 is installed at the rear end of the water discharge pipe 50 along the geothermal water transfer direction.

The geothermal water produced in the production facility 1 is moved along the withdrawal pipe 50 or the supply pipe 11 in accordance with the driving of the withdrawal shutoff valve 52 and the supply shutoff valve 53.

The replenishment water supply unit includes a replenishing water reservoir 31 containing replenishing water, a pressurization pipe 30 connecting the replenishing water storage tank 31 and the water return pipe 21 to transfer the replenishing water to the water return pipe 21, And a pressurizing pump 32 installed on the pressurizing pipe 30. [ The replenishing water supply unit may further include a buffer tank 33 installed on the pressurizing pipe 30. [

The supplemental water supply unit supplies supplemental water to the storage tank 3 as geothermal heat can not be circulated and is discharged to the water storage tank 51 through the water discharge pipe 50.

A pressurizing pump 32 and a buffer tank 33 are arranged in this order along the pressurizing pipe 30. The pressurizing pump 32 pressurizes the make-up water stored in the makeup water reservoir 31 and transfers it to the water return pipe 21. The makeup water is fed to the return pipe 21 at a proper pressure and flow rate through the buffer tank 33 and then supplied to the injection well 2 in accordance with the driving of the injection pump 20 provided in the return pipe 21.

As described above, when a large amount of impurities are mixed in the geothermal water as in the initial stage of geothermal water production, the geothermal water produced through the geothermal water discharging portion is discharged and treated so that the geothermal heat water containing a large amount of impurities is supplied to the recovery facility 40 . Even if the geothermal water is discharged and not circulated to the storage tank 3, the supplemental water is supplied to the storage tank 3, so that the geothermal water can be produced continuously and stably.

When the state of the geothermal water discharged through the water discharge pipe 50 becomes good, the discharge of the geothermal water is stopped and the geothermal water is supplied to the recovery facility 40 through the supply pipe.

The present embodiment has a structure for more reliably removing impurities from the geothermal water circulated along the supply pipe 11 and the water return pipe 21.

To this end, the circulation device comprises a gas-liquid separator 12, 22 provided on the supply pipe 11 and the water-return pipe 21 for separating and removing gas from the geothermal water, a filter (for filtering impurities from the geothermal water 13, 23).

As shown in FIG. 1, a gas-liquid separator 12 and a filter 13 are disposed in order at the rear end of the supply shutoff valve 53 of the supply pipe. The gas-liquid separator 22 and the filter 23 are sequentially disposed between the recovery device 40 and the injection pump 20 in the water-return pipe 21.

Thus, the geothermal water is moved along the supply pipe 11, and the gas and impurities mixed in the geothermal water are removed while passing through the gas-liquid separator 12 and the filter 13 in order. The geothermal water used through the recovery facility 40 is also moved along the water return pipe 21 and the gas and the impurities are removed through the gas-liquid separator 22 and the filter 23 in order.

Therefore, it is possible to minimize the occurrence of problems in equipment, such as the fact that geothermal heat such as gas is supplied to the recovery facility 40 to corrode or clog the recovery facility 40.

This embodiment is a structure capable of bypassing the geothermal water to the recovery facility 40 in order to confirm in advance whether the circulation of the geothermal water is stable before the discharge of the geothermal water is stopped and then supplied to the recovery facility 40 .

The circulation device of the present embodiment includes a bypass line 60 connected between the supply pipe 11 and the water return pipe 21 to bypass the geothermal water, a bypass valve 60 installed in the bypass line 60, (62) and an outlet valve (63) installed in the supply pipe (11) and the return pipe (21) between the bypass line (60) and the recovery facility (40) have.

As shown in FIG. 1, the bypass line 60 is connected between the front end of the supply pipe to the recovery facility 40 and the rear end of the return pipe 21. The bypass line 60 is provided with a bypass valve 61 for selectively opening and closing the bypass line 60 and a supply pipe 11 is connected to the supply pipe 11 and the water return pipe 21, An inlet valve 63 for opening and closing the inlet valve 62 and the water return pipe 21 is provided.

If the bypass valve 61 is opened in a state in which the inlet valve 62 and the outlet valve 63 are closed, the geothermal water fed along the supply pipe can not be supplied to the recovery facility 40, Is directly transferred to the water return pipe (21) along the return pipe (60) and circulated to the injection water (2) along the water return pipe (21).

In the present embodiment, the recovery facility 40 may be a binary geothermal power generation device that generates electric power using geothermal water as a heat source.

The binary geothermal power generation system is basically an Organic Rankine Cycle and uses geothermal water which is a heat source as a first medium and is used as a first medium such as isopentane where evaporation occurs at a much lower temperature than water 2 is used as the working fluid and the working fluid is evaporated by the heat of the geothermal water while passing through the evaporator which is the heat exchanger without direct contact between the geothermal water and the working fluid, . The working fluid in the vapor state passing through the turbine passes through a condenser, which is an air-cooled or water-cooled heat exchanger, and is condensed into a liquid state and sent back to the evaporator by the pump. That is, the working fluid circulates in the closed loop system, ie, the steam cycle, so that the geothermal water and the working fluid form a binary cycle. Since many techniques have been disclosed for the binary geothermal power generation device, detailed description thereof will be omitted.

In this embodiment, the recovery facility 40 can be applied to both the binery geothermal power generation apparatus and the device for recovering or utilizing thermal energy from the geothermal water of high temperature which is a heat source such as a district heating facility.

Fig. 3 illustrates a structure for recovering thermal energy of geothermal water by the binary geothermal generator according to the present embodiment.

3, the hot geothermal water supplied to the recovery facility 40 through the supply pipe 11 passes through the evaporator 44 of the recovery facility 40 through the supply pipe 11, Thereby supplying heat to the working fluid of the recovery facility 40. The geothermal water that has supplied heat to the working fluid is transferred through the water return pipe 21 and returned to the injection well 2. [ In the recovery facility 40, the working fluid is supplied to the turbine 45 by being supplied with heat through the evaporator 44 and being vaporized to a high temperature. The turbine (45) is rotationally driven to generate electricity through the generator (46). The working fluid that supplied the work in the turbine is cooled in the condenser 47 and then pressurized through the working fluid pump 48 and supplied to the evaporator 44 and circulated.

Hereinafter, the geothermal water circulation process according to the present embodiment will be described.

Geothermal water before normal operation in which geothermal water is produced and circulated In the initial production, the geothermal water produced in a state where there is a lot of impurities in the geothermal water is discharged and the supplement water is circulated.

The supply shutoff valve 53 provided on the supply pipe 11 is closed and the water shutoff valve 52 provided on the water withdrawal pipe 50 is opened as shown in Fig. Thus, the geothermal water produced in the production chamber 1 is discharged to the discharge water storage tank 51 through the discharge water pipe 50 as the production pump 10 is driven.

Then, the water quality of the geothermal water discharged to the water discharge reservoir (51) is checked.

As the production pump 10 continues to operate and the produced geothermal heat is discharged, the water level of the production pot 1 is lowered after a certain period of time. Then, the replenishing water is supplied through the pressurizing pipe (30), and the replenishing water is injected into the injection pouring tank (2).

When the water quality of the geothermal water discharged to the water discharge reservoir 51 is favorable, the circulation device is switched to a normal operation state to stop the supply of geothermal water and the supply of the supplementary water and to supply the geothermal water to the supply pipe 11 and the discharge pipe 50 to the storage tank 3.

Here, since the geothermal water at a high temperature is circulated before the geothermal water is supplied to the recovery facility 40, it is first necessary to check whether the gas-liquid separator, the filter, and the geothermal water circulation are stable. Thus, the geothermal water is bypassed to the recovery facility 40 until the geothermal water circulation pressure and the flow rate are stabilized.

The inlet valve 62 provided in the supply pipe 11 and the outlet valve 63 provided in the return pipe 21 are opened and closed in a state in which the discharge shutoff valve 52 is closed and the supply shutoff valve 53 is opened, Lt; / RTI > Then, the bypass valve 61 provided in the bypass line 60 is opened. Therefore, the geothermal water traveling along the supply pipe is not supplied to the recovery facility 40 but is directly transferred to the water return pipe 21 along the bypass line 60 and circulated along the water return pipe 21. At this time, the production pump 10 installed in the supply pipe 11 adjusts the discharge pressure so that the pressure of the supply pipe 11 is raised so that the hot geothermal water does not vaporize (evaporate).

The bypass valve 61 of the bypass line 60 is operated to close the inlet valve 62 and the outlet valve 63 when the pressure and the circulating flow rate of the supply pipe 11 and the water return pipe 21 are kept constant, .

Thus, the geothermal water is supplied to the recovery facility 40 along the supply pipe, exchanged with the recovery facility 40, and then circulated to the injection facility 2 through the water recovery facility.

In this process, impurities such as gas and solid mixed in the geothermal water are separated and removed by the gas-liquid separator and the filter. Therefore, it is possible to supply the geothermal water in a highly purified state, from which the impurities are removed, to the recovery facility 40.

While the illustrative embodiments of the present invention have been shown and described, various modifications and alternative embodiments may be made by those skilled in the art. Such variations and other embodiments will be considered and included in the appended claims, all without departing from the true spirit and scope of the invention.

1: Production process 2: Injection process
3: Storage tank 10: Production pump
11: Supply piping 12, 22: Gas-liquid separator
13, 23: Filter 20: Infusion pump
21: water return pipe 30: pressure pipe
31: replenishment water storage tank 32: pressure pump
40: collection facility 50: drainage piping
51: Dehydration reservoir 52: Dehydration isolation valve
53: supply shutoff valve 60: bypass line
61: bypass valve 62: inlet valve
63: Exit valve

Claims (14)

At least one production facility for producing high temperature geothermal water from the underground storage tank, at least one injection plant for injecting the used geothermal water into the underground storage tank, and a recovery facility for recovering thermal energy of the geothermal water, A feed pipe connected to the feed pipe for feeding the geothermal water, a production pump installed on the feed pipe for feeding the geothermal water, a geothermal water used for the geothermal water which is connected between the recovering facility and the feed chute, A geothermal water discharge unit connected to one side of the supply pipe for discharging the geothermal water mixed with the impurities and shutting off the transfer to the recovery facility; and a groundwater discharge unit connected to one side of the return water pipe, And a replenishment water supply unit for supplying the replenishment water to the superheated steam generator. The method according to claim 1,
Wherein the production pump is installed inside the production well. 3. The method of claim 2,
Further comprising an injection pump installed in the water return pipe for injecting the geothermal water or the makeup water into the injection well at a high pressure. 4. The method according to any one of claims 1 to 3,
The geothermal water discharge unit includes a water discharge pipe branched from the supply pipe and discharging geothermal water, a water discharge reservoir for receiving the geothermal water connected to and discharged from the water discharge pipe, a water discharge shutoff valve installed at one side of the discharge water pipe, And a supply shutoff valve installed in the superheated geothermal water circulation device. 5. The method of claim 4,
Wherein the replenishment water supply unit includes a healing water reservoir containing replenishing water, a pressure pipe connecting the replenishing water storage tank and the water return pipe to transfer the replenishing water to the water return pipe, and a pressure pump installed on the pressure pipe Geothermal water circulation system. 6. The method of claim 5,
And a gas-liquid separator provided on the supply pipe and / or the return pipe for separating and removing gas from the geothermal water. 6. The method of claim 5,
Further comprising a filter installed on the supply pipe and / or the return pipe to filter off impurities mixed in the geothermal water. 6. The method of claim 5,
A bypass line connected between the supply pipe and the return pipe to bypass the geothermal water, a bypass valve installed in the bypass line, an inlet valve installed in the supply pipe and the return pipe between the bypass line and the recovery facility, And an outlet valve. 9. The method of claim 8,
The recovery facility is a binary geothermal power generation device that generates electric power by using geothermal water as a heat source. A production stage for producing high-temperature geothermal water in a high-degree reservoir, a supply stage for transferring the produced high-temperature geothermal water to the energy recovery facility, and an injection stage for injecting the geothermal water used in the recovery facility into the high- As a result,
A discharge step of discharging geothermal water containing impurities during the initial production of the geothermal water to shut off the supply to the collection facility and a replenishment water injection step of injecting the replenishment water into the storage tank when discharging the geothermal water through the discharge step A method of circulation of geothermal water. 11. The method of claim 10,
Wherein the injecting step further comprises the step of injecting geothermal water by pressurizing the geothermal water. The method according to claim 10 or 11,
Wherein the supplying step and / or the supplying step further include a gas-liquid separating step for separating gas from the geothermal water. The method according to claim 10 or 11,
Wherein the feeding step and / or the injecting step further include a filtration step for filtering off impurities incorporated in the geothermal water. The method according to claim 10 or 11,
Further comprising the step of bypassing the geothermal water to the recovery facility until stabilization of the geothermal water circulation pressure and the flow rate.

Images