Design and construction method of equal volume continuous recharge system in geothermal station

Abstract

The present invention discloses a design and construction method for an equal and continuous recharge system of a geothermal station. The equal and continuous recharge system of a geothermal station is composed of: a closed water intake well, a submersible pump, a one-way valve, an exhaust pipe, a system controller, a vacuum negative pressure unit with a constant temperature cooling water tank, an air intake pipe, a cyclone desander, a small gas-water separator, a gas-water separation desander with a filter, a medium efficiency filter, a high efficiency filter, a heating heat exchanger, a heat pump heat exchanger, a booster pump, an electric valve and a closed recharge well. The design and construction method includes a design and construction method for an equal and continuous recharge system of a geothermal station, as well as a design, manufacturing, installation and use method of a vacuum negative pressure unit with a constant temperature cooling water tank and a gas-water separation desander with a filter, and combines existing technical equipment to form a complete set of equal and continuous recharge system of a geothermal station. It solves the problem that the existing technology cannot solve the problem that the sandstone aquifer in the medium and deep geothermal development cannot be recharged in equal amounts.

Description

Technical Field

[0001] The present invention relates to the technical field of water extraction and reinjection in mid-deep geothermal development, and in particular to a design and construction method of an equal-volume continuous reinjection system for a geothermal station. Background Art

[0002] Because geothermal energy is green, low-carbon, and recyclable, and has the characteristics of large reserves, wide distribution, stability and reliability, using geothermal energy for power generation in areas rich in high-temperature geothermal resources and using geothermal energy for heating in areas rich in medium- and low-temperature geothermal resources will have positive significance for improving my country's energy structure, promoting high-quality development, and achieving carbon peak and carbon neutrality.

[0003] Around 2020, the National Geothermal Energy Center organized the domestic geothermal industry to sort out the core key technologies that restrict geothermal energy development, and sorted out a total of 23 bottleneck technologies, emphasizing that reinjection technology is still a shortcoming so far. Pang Zhonghe, director of the Geothermal Resources Research Center of the Institute of Geology and Geophysics, Chinese Academy of Sciences, pointed out that some bottleneck problems, such as taking heat without taking water and low sandstone reinjection efficiency, need to be tackled intensively.

[0004] The main difficulty of deep geothermal water recharge is sandstone recharge. In order to solve the problem of equal and continuous recharge of sandstone aquifers, various blockage factors affecting sandstone recharge must be completely solved. Because the permeable flow channel of sandstone aquifers is small, it is easy to be blocked by gas, sand and oxide microorganisms, which leads to the continuous attenuation of recharge volume and cannot be recharged in equal and continuous amount.

[0005] Since the traditional cyclone desander does not have a large-displacement automatic exhaust valve that is not afraid of being blocked by well water oxides, in order to prevent gas accumulation on the top, the traditional cyclone desander can only be designed with a bottom-in and top-out design, so that the decompressed bubbles are carried away with the water flow, so the traditional cyclone desander has no degassing function. Because the well water inside the barrel swirls upward, only larger particles of mud and sand can rely on their own weight to break through the lift of the upward swirling water flow and settle downward, and the fine mud and sand are carried away by the water flow, resulting in the low sand removal efficiency of the traditional cyclone desander. In order to prevent mud and sand from clogging the recharge well and underground aquifers, the companies that are doing well have begun to use low, medium and high efficiency three-stage filters to strictly filter the mud and sand in the well water. However, because the resistance of the three-stage filter is large, the pump head consumed is large, the pump operation cost is very high, and because it is troublesome to replace and clean the filter cloth, it is urgent to use a gas-water separation desander with a filter to reduce the filtration burden.

[0006] In addition, well water contains various chemical ions, which will undergo oxidation reactions once they come into contact with air. Because the exhaust port of general automatic exhaust valves is very small, they are easily blocked by well water oxides, resulting in the fact that there is no automatic exhaust valve that is not afraid of well water oxide blockage in the geothermal development industry. A few geothermal development companies have realized that the increasing recharge pressure and the decreasing recharge volume are caused by gas blocking the underground aquifer, and have begun to use intermediate tanks to remove gas from well water. Because there are no small gas-water separators that are not afraid of well water oxide blockage, large-displacement one-way automatic exhaust valves can be used. They can only rely on the liquid level contact switch to control the intermittent exhaust of the electric valve on the top of the tank body, which relies entirely on the accumulation of gas on the upper part of the tank body to force the water level in the tank to drop to a certain position before exhausting. Uninterrupted automatic exhaust cannot be achieved, and the gas-water interface inside the tank body is sometimes high and sometimes low, and the decompression and degassing effect is sometimes good and sometimes poor. Since the vacuum negative pressure unit with a constant temperature cooling water tank is not used to draw vacuum in the closed water well, the well water cannot be forced to be decompressed and degassed, and the gas-water separation and desander with a filter is not used to fully decompress and degas, and the dissolved gas in the well water cannot be completely decompressed and separated. In addition, the wellhead of the reinjection well does not use a small gas-water separator to automatically exhaust, and the residual gas in the incoming water cannot be eliminated. It cannot eliminate the gas coming up from underground, and can only complete a fraction of the decompression and degassing work, which cannot completely solve the problem of gas blockage in the underground aquifer, and can only reduce the number of well washing times, but cannot meet the requirement of ensuring long-term continuous well water reinjection without well washing.

[0007] In addition, in the past, there was no reliable degassing equipment to force well water to decompress and degas. Most geothermal development companies used open wells for water extraction and open well recharge, relying entirely on the natural decompression and degassing of the open wells. Relying entirely on natural recharge resulted in a very small recharge volume. Because there was no reliable degassing equipment to force well water to decompress and degas, the gas in the well water could not be decompressed and separated. In order to implement pressurized recharge and increase the recharge volume, only high-lift booster pumps could be used to overcome the gas resistance of pipeline equipment and the wellhead of the recharge well, and the well water containing gas was forced to be recharged underground, resulting in a high booster pump head, high power consumption and high operating costs. Forcing the well water containing gas to be recharged underground causes gas blockage in the seepage flow channel of the underground aquifer, and it is necessary to frequently recharge and wash the well to eliminate gas blockage in the underground aquifer.

[0008] In addition, there was no reliable degassing equipment available in the past, and only open wells could be used for water extraction and re-injection. The well water had the opportunity to come into contact with the air, which caused oxidation reactions of various chemical ions in the well water, some of which generated viscous oxides, and some generated suspended sediments, which blocked the re-injection wells and underground aquifers. In addition, well flushing can only temporarily eliminate gas blockage in underground aquifers, but cannot remove the blockage of oxide microorganisms, and cannot completely solve the problem of attenuation of re-injection volume. A few geothermal development companies have realized the importance of closed water extraction and closed pressurized re-injection. In order to prevent the oxidation reaction of well water, they have begun to use manhole covers to seal the water extraction wells and re-injection wells for water extraction and re-injection. However, because there is no reliable well water decompression and degassing equipment available, the dissolved gas in the well water cannot be completely decompressed and separated. Only high-lift water pumps can be used to force the well water containing gas to be re-injected underground, resulting in the loss of one thing while gaining another.

[0009] In summary, among the three major blockage factors that lead to the attenuation of sandstone recharge volume, namely, gas blockage, sand blockage, and oxide microbial dirty blockage, sand blockage is easier to understand and has been taken seriously by geothermal development companies. Various well water filtration equipment is available on the market, and the sand blockage problem can be solved by strict filtration. Due to insufficient attention to gas blockage and dirty blockage in the past, it has not been well solved so far. From the above analysis, it can be seen that solving the gas blockage of underground aquifers is the most important, because gas blockage of underground aquifers leads to the attenuation of recharge volume, which is faster than sand blockage and dirty blockage, and the harmful effect is more obvious, so it should be solved first. Oxide microbial dirty blockage comes relatively slowly, but it is fatal to the recharge well, because after the aquifer around the recharge well is dirty and blocked, no matter how the well is washed, the recharge capacity cannot be fully restored. Only by using a complete set of well water degassing and sand removal equipment to implement closed water intake and return can the three major blockage factors be fundamentally solved. Summary of the invention

[0010] In order to help the geothermal development industry completely solve the problem of water reinjection in deep-layer geothermal development wells, the present invention discloses a design and construction method for an equal-volume continuous reinjection system for a geothermal station.

[0011] The invention mainly includes three aspects: first, it discloses the design and construction method of the geothermal station equal-volume continuous recharge system, providing a complete set of geothermal station equal-volume continuous recharge system design and construction method for geothermal development enterprises; second, it discloses the design, manufacturing, installation and use method of the vacuum negative pressure unit with a constant temperature cooling water tank in the geothermal station equal-volume continuous recharge system; third, it discloses the design, manufacturing, installation and use method of the gas-water separation desander with a filter in the geothermal station equal-volume continuous recharge system.

[0012] The invention discloses a design and construction method of an equal amount continuous recharge system for a geothermal station. The equal amount continuous recharge system for a geothermal station comprises: a closed water intake well (1), a submersible pump (2), a one-way valve (3), an exhaust pipe (4), a system controller (5), a vacuum negative pressure unit with a constant temperature cooling water tank (6), an air intake pipe (7), a cyclone desander (8), a small gas-water separator (9), a gas-water separation desander with a filter (10), a medium efficiency filter (11), a high efficiency filter (12), a heating heat exchanger (13), a heat pump heat exchanger (14), a booster pump (15), an electric valve (16) and a closed recharge well (17). The invention is characterized in that: the submersible pump (2) is arranged in the closed water intake well (1 ), a one-way valve (3), a cyclone desander (8), a gas-water separation desander with a filter (10), a medium-efficiency filter (11), a high-efficiency filter (12), a heating heat exchanger (13), a heat pump heat exchanger (14), a booster pump (15), and an electric valve (16) are sequentially installed in series on the outlet pipe of the submersible pump; a small gas-water separator (9) is installed between the inner and outer pipe interlayers under the cover of the closed reinjection well (17) and between the return pipe and the highest point of all the desanding and filtering barrel equipment; an air intake pipe (7) is installed between the inner and outer pipe interlayers under the cover of the closed water intake well (1), and the vacuum tank of the vacuum negative pressure unit (6) with a constant temperature cooling water tank is connected through the air intake pipe (7); the constant temperature cooling water tank The vacuum negative pressure unit (6) is composed of: a chassis (6-1), a vacuum pump 1 (6-2), a vacuum pump 2 (6-3), a vacuum tank (6-4), a check valve (6-5), a ball valve (6-6), a system controller (5), an electric contact vacuum gauge (6-7), an exhaust pipe (6-8), an exhaust pipe (6-9), an exhaust hood (6-10), a fan (6-11), a heat exchanger (6-12), a spray chamber (6-13), a water supply pipe (6-14), a water tank (6-15), a drain pipe (6-16), a circulation pump (6-17), and a water diversion pipe (6-18); the system controller (5), the vacuum pump 1 (6-2), the vacuum pump 2 (6-3), a vacuum tank (6-4), a check valve (6-5), a ball valve (6-6), a system controller (5), an electric contact vacuum gauge (6-7), an exhaust pipe (6-8), an exhaust pipe (6-9), an exhaust hood (6-10), a fan (6-11), a heat exchanger (6-12), a spray chamber (6-13), a water supply pipe (6-14), a water tank (6-15), a drain pipe (6-16), a circulation pump (6-17), and a water diversion pipe (6-18) are installed on the chassis (6-1). Two (6-3), a vacuum tank (6-4) and a constant temperature cooling water tank assembly consisting of an exhaust hood (6-10), a fan (6-11), a heat exchanger (6-12), a spray chamber (6-13), a water supply pipe (6-14), a water tank (6-15), a drain pipe (6-16), a circulation pump (6-17) and a water tank (6-15); one side of the vacuum tank (6-4) is connected to a closed water well (1) through an air intake pipe (7); a check valve (6-5) and a ball valve (6-6) are provided on the air intake pipe (7); the other side of the vacuum tank (6-4) is connected to an exhaust pipe (6-9); the exhaust pipe (6-9) is connected to the air intake ports of vacuum pump one (6-2) and vacuum pump two (6-3);An electric contact vacuum gauge (6-7) is provided on the upper part of the vacuum tank (6-4); one end of the exhaust pipe (6-8) is connected to the air outlets of vacuum pump 1 (6-2) and vacuum pump 2 (6-3); the other end is sent to the spray chamber (6-13); a heat exchanger (6-12) is provided above the spray chamber (6-13); a fan (6-11) and an exhaust hood (6-10) are provided above the heat exchanger (6-12); an exhaust pipe (4) is sleeved on the exhaust hood (6-10); a water tank (6-15) is provided below the spray chamber (6-13); a water supply pipe (6-14) is connected to the barrel wall of the water tank (6-15); ), a drainage pipe (6-16), a circulation pump (6-17), and a water guide pipe (6-18) are respectively connected to the bottom of the water tank (6-15), and the water guide pipe (6-18) is connected to the working fluid water inlet of the vacuum pump 1 (6-2) and the vacuum pump 2 (6-3); the gas-water separation desander (10) with a filter is composed of: a water outlet pipe (10-1), a water inlet pipe (10-2), a hat-shaped gas-water separator (10-3), a top cover (10-4), a barrel (10-5), a quick-detachable flange (10-6), a funnel-shaped upper filter cloth (10-7), an upper bracket (10-8), a sand guide pipe (10-11), and a filter. 0-9), a lower bracket (10-10), a lower filter cloth (10-11), and a sand discharge port (10-12); a top cover (10-4) is provided on the barrel body (10-5), a hat-shaped gas-water separator (10-3) is provided on the top cover (10-4), a quick-detachable flange (10-6) is provided between the top cover (10-4) and the barrel body (10-5), an inlet pipe (10-2) is welded in the normal direction of the upper barrel wall on one side of the barrel body (10-5), and a water outlet pipe (10-1) is welded in the normal direction of the lower barrel wall on the other side of the barrel body (10-5), and a flange (10-6) is provided between the inlet pipe (10-2) and the outlet pipe (10-1). A funnel-shaped upper bracket (10-8) is provided between the water pipes (10-1), a sand guide pipe (10-9) is welded below the upper bracket (10-8), an inverted funnel-shaped lower bracket (10-10) is welded below the sand guide pipe (10-9), a funnel-shaped upper filter cloth (10-7) is fixed on the upper bracket (10-8), an inverted funnel-shaped lower filter cloth (10-11) is fixed below the lower bracket (10-10), the water outlet pipe (10-1) is provided between the funnel-shaped upper filter cloth (10-7) and the lower filter cloth (10-11), and the sand discharge port (10-12) is provided below the lower bracket (10-10). ;

[0013] The geothermal station equal amount continuous recharge system design and construction method includes the geothermal station equal amount continuous recharge system design and construction method, and the design, manufacture, installation and use method of the vacuum negative pressure unit (6) with a constant temperature cooling water tank and the air-water separation desander (10) with a filter,

[0014] 1. Design and construction method of geothermal station equal volume continuous recharge system

[0015] The geothermal station equal volume continuous recharging system comprises: a closed water intake well (1), a submersible pump (2), a one-way valve (3), an exhaust pipe (4), a system controller (5), a vacuum negative pressure unit with a constant temperature cooling water tank (6), an air intake pipe (7), a cyclone desander (8), a small gas-water separator (9), a gas-water separation desander with a filter (10), a medium efficiency filter (11), a high efficiency filter (12), a heating heat exchanger (13), a heat pump heat exchanger (14), a pressurized The invention is composed of a pump (15), an electric valve (16) and a closed reinjection well (17); a design and construction method for an equal amount of continuous reinjection system of a geothermal station, including using a vacuum negative pressure unit (6) with a constant temperature cooling water tank to draw vacuum from the space above the dynamic water level in the closed water intake well (1); including using a gas-water separation desander (10) with a filter to fully decompress and degas the well water; including using a small gas-water separator (9) installed at the wellhead of the closed reinjection well (17) and the highest point of the return pipe to automatically exhaust the gas. , to prevent gas blockage at the wellhead of the closed pressurized recharge well; including installing a small gas-water separator (9) on the top of the cyclone desander (8), the medium-efficiency filter (11), and the high-efficiency filter (12) to automatically exhaust the gas, so that all the desander filter barrel equipment has the function of decompression and degassing; including installing a one-way valve (3) on the outlet pipe of the submersible pump (2) to prevent the well water from flowing back after the submersible pump (2) is shut down; including installing a submersible pump (2) on the return pipe at the wellhead of the closed recharge well (17) to synchronize the operation The electric valve (16) is arranged to prevent the well water in the geothermal station water system from running out after the submersible pump (2) stops working; multiple decompression and degassing exhaust equipment is used to ensure that there is no gas resistance in the water intake and recharging system of the geothermal station, making the closed pressurized recharging easy and significantly reducing the power consumption of the pressurized water pump head; the whole process of water intake and recharging can only let out air but not let in air, so as to prevent the well water from contacting with the outside air and preventing the well water from generating oxidation reaction, thereby preventing the recharging well and the underground aquifer from being blocked by oxide microorganisms;

[0016] 2. Design, manufacture, installation and use of vacuum negative pressure unit with constant temperature cooling water tank (6)

[0017] The vacuum negative pressure unit (6) with a constant temperature cooling water tank is composed of: a chassis (6-1), a vacuum pump 1 (6-2), a vacuum pump 2 (6-3), a vacuum tank (6-4), a check valve (6-5), a ball valve (6-6), a system controller (5), an electric contact vacuum gauge (6-7), an exhaust pipe (6-8), an exhaust pipe (6-9), an exhaust hood (6-10), a fan (6-11), a heat exchanger (6-12), a spray chamber (6-13), a water supply pipe (6-14), a water tank (6-15), a drain pipe (6-16), a circulation pump (6-17), and a water diversion pipe (6-18); all the equipment of the vacuum negative pressure unit (6) with a constant temperature cooling water tank is installed on the chassis (6-1), the vacuum pump 1 (6-2), a vacuum pump 2 (6-3), a vacuum tank (6-4), a check valve (6-5), a ball valve (6-6), a system controller (5), an electric contact vacuum gauge (6-7), an exhaust pipe (6-8), an exhaust pipe (6-9), an exhaust hood (6-10), a fan (6-11), a heat exchanger (6-12), a spray chamber (6-13), a water supply pipe (6-14), a water tank (6-15), a drain pipe (6-16), a circulation pump (6-17), and a water diversion pipe (6-18). 2) and the air inlet pipe of the vacuum pump 2 (6-3) are connected in parallel to the exhaust pipe (6-9) to draw vacuum into the vacuum tank (6-4), and the vacuum tank (6-4) draws vacuum into the closed water intake well (1) through the suction pipe (7). The ball valve (6-6) is installed on the suction pipe (7). When the vacuum negative pressure unit (6) with a constant temperature cooling water tank needs to be started, the ball valve (6-6) is opened, and when it does not need to be started, the ball valve (6-6) is closed. The check valve (6-5) is installed on the suction pipe (7). After the vacuum negative pressure unit (6) with a constant temperature cooling water tank is stopped, and when the submersible pump (2) is initially operated and the dynamic water level in the closed water intake well (1) drops rapidly, causing the vacuum degree in the closed water intake well (1) to be higher than the vacuum degree in the vacuum tank (6-4), the check valve (6-5) is automatically closed. When the vacuum degree in the vacuum tank (6-4) is higher than the vacuum degree in the closed water well (1), the check valve (6-5) is automatically opened to draw vacuum into the closed water well (1). When the power button on the system controller (5) is pressed to start, power is supplied to the vacuum pump 1 (6-2), the fan (6-11), the circulation pump (6-17) and the electric contact vacuum gauge (6-7). The fan (6-11) operates directly, and the vacuum pump 1 (6-2) operates according to the instructions of the electric contact vacuum gauge (6-7). When the vacuum degree in the vacuum tank (6-4) reaches the upper limit pointer position of the electric contact vacuum gauge (6-7), the electric contact vacuum gauge (6-7) sends an instruction to the system controller (5) to let the vacuum pump 1 (6-2) standby. When the vacuum tank ( When the vacuum degree in the vacuum pump 6-4 is lower than the lower limit pointer position of the electric contact vacuum gauge (6-7), the electric contact vacuum gauge (6-7) sends a command to the system controller (5) to start the vacuum pump 1 (6-2). The vacuum pump 2 (6-3) is used as a standby pump. When the power button of the system controller (5) is pressed to start, the vacuum pump 2 (6-3) is shut down by default. When the vacuum pump 2 (6-3) needs to participate in the operation, press the vacuum pump 2 (6-3) button on the system controller (5). The vacuum pump 2 (6-3) also operates according to the command of the electric contact vacuum gauge (6-7). When the vacuum pump 2 (6-3) does not need to participate in the operation, press the vacuum pump 2 (6-3) button on the system controller (5) to stop the vacuum pump 2 (6-3). When the power button on the system controller (5) is pressed to start,The submersible pump (2) is powered on for 60 seconds and the electric valve (16) is powered on. When the submersible pump (2) is in operation, the submersible pump key on the system controller (5) is pressed and the submersible pump (2) is powered off and shut down. Because the electric valve (16) sets the submersible pump (2) to operate, it is powered off and shut down at the same time. When the power key on the system controller (5) is pressed to start, the booster pump is powered off and shut down by default. When the booster pump (15) needs to be operated, the booster pump key on the system controller (5) is pressed and the booster pump (15) is powered on and operated. When the booster pump (15) is in operation, the booster pump key is pressed and the booster pump (15) is powered off and shut down. The outlet pipes of vacuum pump 1 (6-2) and vacuum pump 2 (6-3) are connected in parallel to the exhaust pipe (6-8). The vacuum pump 1 (6-2) and vacuum pump 2 (6-3) are pumped out. The gas and working fluid are sent into the spray chamber (6-13), the gas is sucked away by the fan (6-11), and discharged to the outside through the exhaust hood (6-10) and the exhaust pipe (4), and the liquid drips into the water tank (6-15) below. The circulation pump (6-17) operates according to the instructions of the system controller (5). When the system controller (5) detects that the water temperature in the water tank (6-15) is higher than 32°C, the circulation pump (6-17) automatically operates. When the system controller (5) detects that the water temperature in the water tank (6-15) is lower than 28°C, the circulation pump (6-17) automatically stands by. The water supply pipe (6-14) on the water tank (6-15) is connected to the tap water pipe on one side and to the float valve in the water tank (6-15) to automatically supply water. When the circulation pump (6-17) is running, Water is pumped out of the water tank (6-15), the outlet pipe of the circulation pump (6-17) is connected to the water inlet of the heat exchanger (6-12), the outlet pipe of the heat exchanger (6-12) is sent into the water tank (6-15), the working fluid water inlet of the vacuum pump 1 (6-2) and the vacuum pump 2 (6-3) is connected to the water outlet at the bottom of the water tank (6-15) through the water guide pipe (6-18), because the water level in the water tank (6-15) is higher than the working fluid water inlet of the vacuum pump 1 (6-2) and the vacuum pump 2 (6-3), it is ensured that the vacuum pump 1 (6-2) and the vacuum pump 2 (6-3) can always absorb water, so that the working fluid temperature and flow requirements of the vacuum pump 1 (6-2) and the vacuum pump 2 (6-3) can be met, and the drain pipe (6-16) at the bottom of the water tank is opened to discharge the high-temperature sewage. Low-temperature clean tap water is added through the water supply pipe (6-14) to adjust the water temperature and water quality; the vacuum negative pressure unit (6) with a constant temperature cooling water tank is specially designed for the development of medium-deep geothermal energy, because the temperature of medium-deep geothermal water is high, all 60-80°C, and the temperature of the gas separated from the geothermal water is also very high. In addition, there are many dissolved gases in the medium-deep geothermal water, the water ring vacuum pump has a long startup time, the friction heat is large, and the working fluid temperature is high. A circulating pump (6-17), a fan (6-11), and a heat exchanger (6-12) must be used for forced cooling and cooling, because the lower the water temperature, the greater the water density, and the higher the vacuum suction efficiency. The system controller (5) is used to intelligently manage the circulating pump (6-17) to operate at a constant temperature and automatically control the operation to ensure that the working fluid water source water temperature in the water tank does not exceed the standard.In order to ensure the long-term efficient and stable operation of the water ring vacuum pump, the toxic and harmful gases separated by decompression are discharged to the outside through the exhaust pipe (4) by the fan (6-11) on the top of the constant temperature cooling water tank, and the purpose of fresh air ventilation in the machine room is achieved at the same time. The system controller (5) is specially designed for the geothermal station equal volume continuous recharge system, and the intelligent control operation manages the start / stop sequence of all fans, water pumps, and vacuum pumps in the water intake and recharge system. Because the gases separated by decompression in the geothermal water are all toxic and harmful gases, they are all highly corrosive gases, and there are also flammable and explosive combustible gases. In order to protect the safety of indoor personnel and house equipment and meet the needs of process flow management, program control management must be adopted;

[0018] 3. Design, manufacture, installation and use of air-water separation and desander with filter (10)

[0019] The gas-water separation sand remover (10) with a filter is composed of: a water outlet pipe (10-1), a water inlet pipe (10-2), a hat-shaped gas-water separator (10-3), a top cover (10-4), a barrel (10-5), a quick-detachable flange (10-6), a funnel-shaped upper filter cloth (10-7), an upper bracket (10-8), a sand guide pipe (10-9), a lower bracket (10-10), a lower filter cloth (10-11) and a sand discharge port (10-12). A top cover (10-4) is provided on the barrel body (10-5), a hat-shaped gas-water separator (10-3) is provided on the top cover (10-4), a quick-detachable flange (10-6) is provided between the top cover (10-4) and the barrel body (10-5), a water inlet pipe (10-2) is welded on the normal direction of the barrel wall of the upper part of one side of the barrel body (10-5), a water outlet pipe (10-1) is welded on the normal direction of the barrel wall of the lower part of the other side of the barrel body (10-5), and a water outlet pipe (10-2) is welded on the normal direction of the barrel wall of the lower part of the other side of the barrel body (10-5). A funnel-shaped upper bracket (10-8) is provided between the filter element (10-2) and the water outlet pipe (10-1), a sand guide pipe (10-9) is welded below the upper bracket (10-8), an inverted funnel-shaped lower bracket (10-10) is welded below the sand guide pipe (10-9), a funnel-shaped upper filter cloth (10-7) is fixed on the upper bracket (10-8), an inverted funnel-shaped lower filter cloth (10-11) is fixed below the lower bracket (10-10), and the water outlet pipe (10-1) is provided at Between the funnel-shaped upper filter cloth (10-7) and the lower filter cloth (10-11), the sand discharge port (10-12) is arranged below the lower bracket (10-10); because the funnel-shaped upper filter cloth (10-7) and the upper bracket (10-8) are added between the water inlet pipe (10-2) and the water outlet pipe (10-1), the filtered mud and sand can enter the central hole along with the water flow and be sent to the bottom of the cone through the sand guide pipe (10-9), so the sand has a self-flushing function and is not easy to accumulate cakes.Because an inverted funnel-shaped lower filter cloth (10-11) and a lower bracket (10-10) are provided at the lower part of the sand guide pipe (10-9) to prevent mud and sand from returning, it can be ensured that there is no mud and sand with a particle size greater than 50um in the water outlet pipe (10-1); because a quick-disassembly flange (10-6) is provided between the top cover (10-4) and the barrel body (10-5), it is convenient to frequently open the top cover (10-4) to check, replace and clean the filter cloth; because the upper bracket (10-8) and the lower bracket (10-10) and the sand guide pipe (10-9) are welded as a whole, the whole can be taken out to fix the funnel-shaped upper filter cloth (10-7) and the lower filter cloth (10-11) and then put back, and the whole can also be taken out to replace and clean the filter cloth, greatly increasing the diameter of the barrel body (10-5), further slowing down the flow rate of the well water, and the top cover (10-4) A hat-shaped air-water separator (10-3) is installed on the top to collect and separate the bubbles decompressed during the slow vortex of well water in time, thus forming a huge air-water separator with high degassing efficiency. Because it can automatically exhaust air continuously, there will be no gas accumulation under the top cover (10-4), so the traditional bottom-in and top-out vortex desander is improved to a top-in and bottom-out design, making full use of the downward vortex guiding force of well water, centrifugal force and gravity of mud and sand. The three forces are combined to guide the mud and sand to vortex and settle downward, thus forming a vortex desander with high desanding efficiency. Because of the use of positive funnel and inverted funnel filters, it becomes a large self-flushing primary filter. Because the barrel diameter is large, the filter cloth area is large, the water resistance is small, and the water pump head consumed is small, which greatly reduces the power consumption of the water pump head and saves the investment in the primary filter.

[0020] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0021] The advantages and features of the present invention are described in detail below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the principle structure of the geothermal station equal-volume continuous recharge system of the present invention;

[0023] Figure 2 This is a principle structural diagram of a vacuum negative pressure unit with a constant temperature cooling water tank according to the present invention;

[0024] Figure 3 This is a principle structural diagram of the gas-water desander with a filter of the present invention;

[0025] In the figure, 1. Closed water well 2. Submersible pump 3. Check valve 4. Exhaust pipe 5. System controller 6. Vacuum negative pressure unit with constant temperature cooling water tank 7. Suction pipe 8. Cyclone desander 9. Small gas-water separator 10. Gas-water separation desander with filter 11. Medium efficiency filter 12. High efficiency filter 13. Heating heat exchanger 14. Heat pump heat exchanger 15. Booster pump 16. Electric valve 17. Closed recharging well 6-1. Chassis 6-2. Vacuum pump 1 6-3. Vacuum pump 2 6-4. Vacuum tank 6-5. Check valve 6-6. Ball valve 6-7. Electric contact vacuum gauge 6-8 .Exhaust pipe 6-9.Suction pipe 6-10.Exhaust hood 6-11.Fan 6-12.Heat exchanger 6-13.Spray chamber 6-14.Water supply pipe 6-15.Water tank 6-16.Drain pipe 6-17.Circulation pump 6-18.Water pipe 10-1.Water outlet pipe 10-2.Water inlet pipe 10-3.Hat-shaped air-water separator 10-4.Top cover 10-5.Barrel 10-6.Quick disassembly flange 10-7.Funnel-shaped upper filter cloth 10-8.Upper bracket 10-9.Sand guide pipe 10-10.Lower bracket 10-11.Inverted funnel-shaped lower filter cloth 10-12.Sand outlet DETAILED DESCRIPTION

[0026] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0027] In order to fully understand the present invention, a detailed structure will be presented in the following description. Obviously, the implementation of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention can also have other embodiments.

[0028] The embodiments of the present invention are described in detail below.

[0029] Reference Figure 1-Figure 3As shown, a design and construction method for an equal amount continuous recharge system of a geothermal station is provided. The equal amount continuous recharge system of the geothermal station is composed of: a closed water intake well (1), a submersible pump (2), a one-way valve (3), an exhaust pipe (4), a system controller (5), a vacuum negative pressure unit with a constant temperature cooling water tank (6), an air intake pipe (7), a cyclone desander (8), a small gas-water separator (9), a gas-water separation desander with a filter (10), a medium efficiency filter (11), a high efficiency filter (12), a heating heat exchanger (13), a heat pump heat exchanger (14), a booster pump (15), an electric valve (16) and a closed recharge well (17), and is characterized in that: the submersible pump (2) is arranged in the closed water intake well. (1), a one-way valve (3), a cyclone desander (8), a gas-water separation desander with a filter (10), a medium-efficiency filter (11), a high-efficiency filter (12), a heating heat exchanger (13), a heat pump heat exchanger (14), a booster pump (15), and an electric valve (16) are sequentially installed in series on the outlet pipe of the submersible pump; a small gas-water separator (9) is installed between the inner and outer pipe interlayers under the cover of the closed reinjection well (17) and between the return pipe and the highest point of all the desander filter barrel equipment; an air intake pipe (7) is installed between the inner and outer pipe interlayers under the cover of the closed water intake well (1), and the vacuum tank of the vacuum negative pressure unit (6) with a constant temperature cooling water tank is connected through the air intake pipe (7); the constant temperature cooling water tank with the vacuum negative pressure unit (6) is connected to the vacuum tank; the vacuum negative pressure unit (6) with the constant temperature cooling water tank ... negative pressure unit (6) in series in series on the outlet pipe of the submersible pump. The vacuum negative pressure unit (6) of the box is composed of: a chassis (6-1), a vacuum pump 1 (6-2), a vacuum pump 2 (6-3), a vacuum tank (6-4), a check valve (6-5), a ball valve (6-6), a system controller (5), an electric contact vacuum gauge (6-7), an exhaust pipe (6-8), an exhaust pipe (6-9), an exhaust hood (6-10), a fan (6-11), a heat exchanger (6-12), a spray chamber (6-13), a water supply pipe (6-14), a water tank (6-15), a drain pipe (6-16), a circulation pump (6-17), and a water diversion pipe (6-18); the system controller (5), the vacuum pump 1 (6-2), the ... the vacuum tank (6-4), the vacuum tank (6-5), the vacuum tank (6-6), the vacuum tank (6-7), the vacuum tank (6-8), the vacuum tank (6-9), the vacuum tank (6-10), the vacuum tank (6-11), the vacuum tank (6-11), the vacuum tank (6-11), the vacuum tank (6-11), the vacuum tank (6-11), the vacuum tank (6-11), the vacuum tank (6-11), the vacuum tank (6-11), the vacuum tank ( Pump 2 (6-3), vacuum tank (6-4) and a constant temperature cooling water tank assembly consisting of an exhaust hood (6-10), a fan (6-11), a heat exchanger (6-12), a spray chamber (6-13), a water supply pipe (6-14), a water tank (6-15), a drain pipe (6-16), a circulation pump (6-17) and a water tank (6-15); one side of the vacuum tank (6-4) is connected to a closed water well (1) through an air intake pipe (7); a check valve (6-5) and a ball valve (6-6) are provided on the air intake pipe (7); the other side of the vacuum tank (6-4) is connected to an exhaust pipe (6-9); the exhaust pipe (6-9) is connected to the air intake ports of vacuum pump 1 (6-2) and vacuum pump 2 (6-3);An electric contact vacuum gauge (6-7) is provided on the upper part of the vacuum tank (6-4); one end of the exhaust pipe (6-8) is connected to the air outlets of vacuum pump 1 (6-2) and vacuum pump 2 (6-3); the other end is sent to the spray chamber (6-13); a heat exchanger (6-12) is provided above the spray chamber (6-13); a fan (6-11) and an exhaust hood (6-10) are provided above the heat exchanger (6-12); an exhaust pipe (4) is sleeved on the exhaust hood (6-10); a water tank (6-15) is provided below the spray chamber (6-13); a water supply pipe (6-14) is connected to the barrel wall of the water tank (6-15); ), a drainage pipe (6-16), a circulation pump (6-17), and a water guide pipe (6-18) are respectively connected to the bottom of the water tank (6-15), and the water guide pipe (6-18) is connected to the working fluid water inlet of the vacuum pump 1 (6-2) and the vacuum pump 2 (6-3); the gas-water separation desander (10) with a filter is composed of: a water outlet pipe (10-1), a water inlet pipe (10-2), a hat-shaped gas-water separator (10-3), a top cover (10-4), a barrel (10-5), a quick-detachable flange (10-6), a funnel-shaped upper filter cloth (10-7), an upper bracket (10-8), a sand guide pipe ( 10-9), a lower bracket (10-10), a lower filter cloth (10-11), and a sand discharge port (10-12); a top cover (10-4) is provided on the barrel body (10-5), a hat-shaped air-water separator (10-3) is provided on the top cover (10-4), a quick-detachable flange (10-6) is provided between the top cover (10-4) and the barrel body (10-5), an inlet pipe (10-2) is welded in the normal direction of the upper barrel wall on one side of the barrel body (10-5), a water outlet pipe (10-1) is welded in the normal direction of the lower barrel wall on the other side of the barrel body (10-5), and a water inlet pipe (10-2) is welded in the normal direction of the lower barrel wall on the other side of the barrel body (10-5). A funnel-shaped upper bracket (10-8) is provided between the upper bracket (10-8) and the water outlet pipe (10-1), a sand guide pipe (10-9) is welded below the upper bracket (10-8), an inverted funnel-shaped lower bracket (10-10) is welded below the sand guide pipe (10-9), a funnel-shaped upper filter cloth (10-7) is fixed on the upper bracket (10-8), an inverted funnel-shaped lower filter cloth (10-11) is fixed below the lower bracket (10-10), the water outlet pipe (10-1) is provided between the funnel-shaped upper filter cloth (10-7) and the lower filter cloth (10-11), and a sand discharge port (10-12) is provided below the lower bracket (10-10). ;

[0030] The geothermal station equal amount continuous recharge system design and construction method includes the geothermal station equal amount continuous recharge system design and construction method, and the design, manufacture, installation and use method of the vacuum negative pressure unit (6) with a constant temperature cooling water tank and the air-water separation desander (10) with a filter,

[0031] 1. Design and construction method of geothermal station equal volume continuous recharge system

[0032] The geothermal station equal volume continuous recharging system comprises: a closed water intake well (1), a submersible pump (2), a one-way valve (3), an exhaust pipe (4), a system controller (5), a vacuum negative pressure unit with a constant temperature cooling water tank (6), an air intake pipe (7), a cyclone desander (8), a small gas-water separator (9), a gas-water separation desander with a filter (10), a medium efficiency filter (11), a high efficiency filter (12), a heating heat exchanger (13), a heat pump heat exchanger (14), a pressurized The invention is composed of a pump (15), an electric valve (16) and a closed reinjection well (17); a design and construction method for an equal amount of continuous reinjection system of a geothermal station, including using a vacuum negative pressure unit (6) with a constant temperature cooling water tank to draw vacuum from the space above the dynamic water level in the closed water intake well (1); including using a gas-water separation desander (10) with a filter to fully decompress and degas the well water; including using a small gas-water separator (9) installed at the wellhead of the closed reinjection well (17) and the highest point of the return pipe to automatically exhaust the gas. , to prevent gas blockage at the wellhead of the closed pressurized recharge well; including installing a small gas-water separator (9) on the top of the cyclone desander (8), the medium-efficiency filter (11), and the high-efficiency filter (12) to automatically exhaust the gas, so that all the desander filter barrel equipment has the function of decompression and degassing; including installing a one-way valve (3) on the outlet pipe of the submersible pump (2) to prevent the well water from flowing back after the submersible pump (2) is shut down; including installing a submersible pump (2) on the return pipe at the wellhead of the closed recharge well (17) to synchronize the operation The electric valve (16) is arranged to prevent the well water in the geothermal station water system from running out after the submersible pump (2) stops working; multiple decompression and degassing exhaust equipment is used to ensure that there is no gas resistance in the water intake and recharging system of the geothermal station, making the closed pressurized recharging easy and significantly reducing the power consumption of the pressurized water pump head; the whole process of water intake and recharging can only let out air but not let in air, so as to prevent the well water from contacting with the outside air and preventing the well water from generating oxidation reaction, thereby preventing the recharging well and the underground aquifer from being blocked by oxide microorganisms;

[0033] 2. Design, manufacture, installation and use of vacuum negative pressure unit with constant temperature cooling water tank (6)

[0034] The vacuum negative pressure unit (6) with a constant temperature cooling water tank is composed of: a chassis (6-1), a vacuum pump 1 (6-2), a vacuum pump 2 (6-3), a vacuum tank (6-4), a check valve (6-5), a ball valve (6-6), a system controller (5), an electric contact vacuum gauge (6-7), an exhaust pipe (6-8), an exhaust pipe (6-9), an exhaust hood (6-10), a fan (6-11), a heat exchanger (6-12), a spray chamber (6-13), a water supply pipe (6-14), a water tank (6-15), a drain pipe (6-16), a circulation pump (6-17), and a water diversion pipe (6-18); all the equipment of the vacuum negative pressure unit (6) with a constant temperature cooling water tank is installed on the chassis (6-1), the vacuum pump 1 (6-2), a vacuum pump 2 (6-3), a vacuum tank (6-4), a check valve (6-5), a ball valve (6-6), a system controller (5), an electric contact vacuum gauge (6-7), an exhaust pipe (6-8), an exhaust pipe (6-9), an exhaust hood (6-10), a fan (6-11), a heat exchanger (6-12), a spray chamber (6-13), a water supply pipe (6-14), a water tank (6-15), a drain pipe (6-16), a circulation pump (6-17), and a water diversion pipe (6-18). 2) and the air inlet pipe of the vacuum pump 2 (6-3) are connected in parallel to the exhaust pipe (6-9) to draw vacuum into the vacuum tank (6-4), and the vacuum tank (6-4) draws vacuum into the closed water intake well (1) through the suction pipe (7). The ball valve (6-6) is installed on the suction pipe (7). When the vacuum negative pressure unit (6) with a constant temperature cooling water tank needs to be started, the ball valve (6-6) is opened, and when it does not need to be started, the ball valve (6-6) is closed. The check valve (6-5) is installed on the suction pipe (7). After the vacuum negative pressure unit (6) with a constant temperature cooling water tank is stopped, and when the submersible pump (2) is initially operated and the dynamic water level in the closed water intake well (1) drops rapidly, causing the vacuum degree in the closed water intake well (1) to be higher than the vacuum degree in the vacuum tank (6-4), the check valve (6-5) is automatically closed. When the vacuum degree in the vacuum tank (6-4) is higher than the vacuum degree in the closed water well (1), the check valve (6-5) is automatically opened to draw vacuum into the closed water well (1). When the power button on the system controller (5) is pressed to start, power is supplied to the vacuum pump 1 (6-2), the fan (6-11), the circulation pump (6-17) and the electric contact vacuum gauge (6-7). The fan (6-11) operates directly, and the vacuum pump 1 (6-2) operates according to the instructions of the electric contact vacuum gauge (6-7). When the vacuum degree in the vacuum tank (6-4) reaches the upper limit pointer position of the electric contact vacuum gauge (6-7), the electric contact vacuum gauge (6-7) sends an instruction to the system controller (5) to let the vacuum pump 1 (6-2) standby. When the vacuum tank ( When the vacuum degree in the vacuum pump 6-4 is lower than the lower limit pointer position of the electric contact vacuum gauge (6-7), the electric contact vacuum gauge (6-7) sends a command to the system controller (5) to start the vacuum pump 1 (6-2). The vacuum pump 2 (6-3) is used as a standby pump. When the power button of the system controller (5) is pressed to start, the vacuum pump 2 (6-3) is shut down by default. When the vacuum pump 2 (6-3) needs to participate in the operation, press the vacuum pump 2 (6-3) button on the system controller (5). The vacuum pump 2 (6-3) also operates according to the command of the electric contact vacuum gauge (6-7). When the vacuum pump 2 (6-3) does not need to participate in the operation, press the vacuum pump 2 (6-3) button on the system controller (5) to stop the vacuum pump 2 (6-3). When the power button on the system controller (5) is pressed to start,The submersible pump (2) is powered on for 60 seconds and the electric valve (16) is powered on. When the submersible pump (2) is in operation, the submersible pump key on the system controller (5) is pressed and the submersible pump (2) is powered off and shut down. Because the electric valve (16) sets the submersible pump (2) to operate, it is powered off and shut down at the same time. When the power key on the system controller (5) is pressed to start, the booster pump is powered off and shut down by default. When the booster pump (15) needs to be operated, the booster pump key on the system controller (5) is pressed and the booster pump (15) is powered on and operated. When the booster pump (15) is in operation, the booster pump key is pressed and the booster pump (15) is powered off and shut down. The outlet pipes of vacuum pump 1 (6-2) and vacuum pump 2 (6-3) are connected in parallel to the exhaust pipe (6-8). The vacuum pump 1 (6-2) and vacuum pump 2 (6-3) are pumped out. The gas and working fluid are sent into the spray chamber (6-13), the gas is sucked away by the fan (6-11), and discharged to the outside through the exhaust hood (6-10) and the exhaust pipe (4), and the liquid drips into the water tank (6-15) below. The circulation pump (6-17) operates according to the instructions of the system controller (5). When the system controller (5) detects that the water temperature in the water tank (6-15) is higher than 32°C, the circulation pump (6-17) automatically operates. When the system controller (5) detects that the water temperature in the water tank (6-15) is lower than 28°C, the circulation pump (6-17) automatically stands by. The water supply pipe (6-14) on the water tank (6-15) is connected to the tap water pipe on one side and to the float valve in the water tank (6-15) to automatically supply water. When the circulation pump (6-17) is running, Water is pumped out of the water tank (6-15), the outlet pipe of the circulation pump (6-17) is connected to the water inlet of the heat exchanger (6-12), the outlet pipe of the heat exchanger (6-12) is sent into the water tank (6-15), the working fluid water inlet of the vacuum pump 1 (6-2) and the vacuum pump 2 (6-3) is connected to the water outlet at the bottom of the water tank (6-15) through the water guide pipe (6-18), because the water level in the water tank (6-15) is higher than the working fluid water inlet of the vacuum pump 1 (6-2) and the vacuum pump 2 (6-3), it is ensured that the vacuum pump 1 (6-2) and the vacuum pump 2 (6-3) can always absorb water, so that the working fluid temperature and flow requirements of the vacuum pump 1 (6-2) and the vacuum pump 2 (6-3) can be met, and the drain pipe (6-16) at the bottom of the water tank is opened to discharge the high-temperature sewage. Low-temperature clean tap water is added through the water supply pipe (6-14) to adjust the water temperature and water quality; the vacuum negative pressure unit (6) with a constant temperature cooling water tank is specially designed for the development of medium-deep geothermal energy, because the temperature of medium-deep geothermal water is high, all 60-80°C, and the temperature of the gas separated from the geothermal water is also very high. In addition, there are many dissolved gases in the medium-deep geothermal water, the water ring vacuum pump has a long startup time, the friction heat is large, and the working fluid temperature is high. A circulating pump (6-17), a fan (6-11), and a heat exchanger (6-12) must be used for forced cooling and cooling, because the lower the water temperature, the greater the water density, and the higher the vacuum suction efficiency. The system controller (5) is used to intelligently manage the circulating pump (6-17) to operate at a constant temperature and automatically control the operation to ensure that the working fluid water source water temperature in the water tank does not exceed the standard.In order to ensure the long-term efficient and stable operation of the water ring vacuum pump, the toxic and harmful gases separated by decompression are discharged to the outside through the exhaust pipe (4) by the fan (6-11) on the top of the constant temperature cooling water tank, and the purpose of fresh air ventilation in the machine room is achieved at the same time. The system controller (5) is specially designed for the geothermal station equal volume continuous recharge system, and the intelligent control operation manages the start / stop sequence of all fans, water pumps, and vacuum pumps in the water intake and recharge system. Because the gases separated by decompression in the geothermal water are all toxic and harmful gases, they are all highly corrosive gases, and there are also flammable and explosive combustible gases. In order to protect the safety of indoor personnel and house equipment and meet the needs of process flow management, program control management must be adopted;

[0035] 3. Design, manufacture, installation and use of air-water separation and desander with filter (10)

[0036] The gas-water separation sand remover (10) with a filter is composed of: a water outlet pipe (10-1), a water inlet pipe (10-2), a hat-shaped gas-water separator (10-3), a top cover (10-4), a barrel (10-5), a quick-detachable flange (10-6), a funnel-shaped upper filter cloth (10-7), an upper bracket (10-8), a sand guide pipe (10-9), a lower bracket (10-10), a lower filter cloth (10-11) and a sand discharge port (10-12). A top cover (10-4) is provided on the barrel body (10-5), a hat-shaped gas-water separator (10-3) is provided on the top cover (10-4), a quick-detachable flange (10-6) is provided between the top cover (10-4) and the barrel body (10-5), a water inlet pipe (10-2) is welded on the normal direction of the barrel wall of the upper part of one side of the barrel body (10-5), a water outlet pipe (10-1) is welded on the normal direction of the barrel wall of the lower part of the other side of the barrel body (10-5), and a water outlet pipe (10-2) is welded on the normal direction of the barrel wall of the lower part of the other side of the barrel body (10-5). A funnel-shaped upper bracket (10-8) is provided between the pipe (10-2) and the water outlet pipe (10-1), a sand guide pipe (10-9) is welded below the upper bracket (10-8), an inverted funnel-shaped lower bracket (10-10) is welded below the sand guide pipe (10-9), a funnel-shaped upper filter cloth (10-7) is fixed on the upper bracket (10-8), an inverted funnel-shaped lower filter cloth (10-11) is fixed below the lower bracket (10-10), and the water outlet pipe (10-1) The filter is arranged between the funnel-shaped upper filter cloth (10-7) and the lower filter cloth (10-11), and the sand discharge port (10-12) is arranged below the lower bracket (10-10); because the funnel-shaped upper filter cloth (10-7) and the upper bracket (10-8) are added between the water inlet pipe (10-2) and the water outlet pipe (10-1), the filtered mud and sand can enter the central hole along with the water flow and be sent to the bottom of the cone through the sand guide pipe (10-9), so the filter has a self-flushing function and is not easy to accumulate cakes.Because an inverted funnel-shaped lower filter cloth (10-11) and a lower bracket (10-10) are provided at the lower part of the sand guide pipe (10-9) to prevent mud and sand from returning, it can be ensured that there is no mud and sand with a particle size greater than 50um in the water outlet pipe (10-1); because a quick-disassembly flange (10-6) is provided between the top cover (10-4) and the barrel body (10-5), it is convenient to frequently open the top cover (10-4) to check, replace and clean the filter cloth; because the upper bracket (10-8) and the lower bracket (10-10) and the sand guide pipe (10-9) are welded as a whole, the whole can be taken out to fix the funnel-shaped upper filter cloth (10-7) and the lower filter cloth (10-11) and then put back, and the whole can also be taken out to replace and clean the filter cloth, greatly increasing the diameter of the barrel body (10-5), further slowing down the flow rate of the well water, and the top cover (10-4) A hat-shaped air-water separator (10-3) is installed on the top to collect and separate the bubbles decompressed during the slow vortex of well water in time, thus forming a huge air-water separator with high degassing efficiency. Because it can automatically exhaust air continuously, there will be no gas accumulation under the top cover (10-4), so the traditional bottom-in and top-out vortex desander is improved to a top-in and bottom-out design, making full use of the downward vortex guiding force of well water, centrifugal force and gravity of mud and sand. The three forces are combined to guide the mud and sand to vortex and settle downward, thus forming a vortex desander with high desanding efficiency. Because of the use of positive funnel and inverted funnel filters, it becomes a large self-flushing primary filter. Because the barrel diameter is large, the filter cloth area is large, the water resistance is small, and the water pump head consumed is small, which greatly reduces the power consumption of the water pump head and saves the investment in the primary filter.

[0037] To further explain:

[0038] 1. The state stipulates that production is determined by injection, which means that the amount of water taken from the water wells is determined by the amount of water recharged by the recharge wells, and more water is not allowed to be taken and less water is not allowed to be recharged. Due to the limitations of existing technical conditions, sandstone aquifers cannot achieve 100% recharge, so the state can only stipulate that geothermal development companies with a recharge rate of less than 80% will not be issued geothermal mining licenses, and use water fees to force geothermal development companies to work hard to increase the recharge rate. Geothermal resource tax will be levied starting in 2021. Well water that can be recharged is very cheap, with only 1 yuan of geothermal resource tax per cubic meter; well water that cannot be recharged is very expensive, with 20-30 yuan of geothermal resource tax per cubic meter, which is to make geothermal development companies with a recharge rate of less than 80% unprofitable. The state uses water fees to force geothermal development companies to increase the recharge rate. Whether it can completely solve the problem of well water recharge and achieve 100% recharge of the taken well water has become the key to the survival and development of geothermal energy development companies. The present invention provides a design and construction method for an equal and continuous reinjection system for a geothermal station, as well as a design, manufacture, installation and use method for related equipment, in order to help medium and deep geothermal development companies solve the problem of reinjection attenuation in sandstone aquifers, so as to achieve the goal of 100% equal reinjection and long-term continuous reinjection of well water without the need for well flushing. This is the primary problem that all geothermal development companies are currently in urgent need of solving.

[0039] 2. In order to better understand the importance of the design and construction method of the geothermal station equal-volume continuous recharge system of the present invention, it is necessary to understand clearly what gases are contained in the deep and medium geothermal water. The buried depth of deep and medium geothermal water is 1 to 3 km, and it has been subjected to 100 to 300 pressures for a long time. The long-term high temperature and high pressure lead to a high content of dissolved gas in the geothermal water. The gases in geothermal water can be divided into two categories: soluble in water and insoluble in water. Under general geological conditions, the gases insoluble in water only account for less than 10% of the total gases, and more than 90% are gases soluble in water. The gases insoluble in water mainly include single working gases such as hydrogen H2 and nitrogen N2, as well as organic gases such as methane CH4, C2H4, and C2H2 with relatively simple molecular structures. The gases dissolved in water mainly include carbon dioxide CO2, nitrogen dioxide NO2, sulfur dioxide SO2, sulfur trioxide SO3, hydrogen sulfide H2S, hydrogen chloride HCL and other gases with relatively complex molecular structures. Only in a few places with heavy oil and gas can methane organic gases account for more than 50% of the total gas. Under the conditions of 100 to 300 pressures, the volume of the gas insoluble in water is compressed to 1 / 100 to 1 / 300, and can be naturally decompressed as the water pressure decreases during the rising process in the water well. The gas dissolved in water cannot be naturally decompressed as the water pressure decreases during the rising process in the water well. Due to the long-term high temperature and high pressure, there is a chemical bond connection between the gas molecules dissolved in water and the water molecules. Only by using a vacuum negative pressure unit (6) with a constant temperature cooling water tank to draw vacuum in the closed water well (1), allowing the well water to be decompressed and degassed in a vacuum negative pressure environment, and at the same time, with the help of the stirring of the submersible pump (2) and the rapid flow in the pipeline, the water molecules collide violently, and use a large gas-water separator such as a gas-water separation and desander (10) with a filter to fully decompress and degas, combined with the use of a small gas-water separator (9) to exhaust the remaining gas, and continuously using the whole set of well water decompression and degassing equipment of the present invention, can the dissolved gas in the well water be completely decompressed and separated.

[0040] 3. In order to completely solve the problem of equal and continuous recharge of sandstone aquifers in medium and deep geothermal development, the inventor believes that it is far from enough to rely solely on equipment on the ground to remove various blocking factors and solve the problem of recharge attenuation. It is also necessary to adopt more advanced well-making technology and strive to increase the recharge volume of recharge wells in order to completely grasp the initiative of equal and continuous recharge of well water. At present, all geothermal development companies drill water wells and recharge wells in the same way. The reason is that there is no equipment that can completely decompress and separate the gas in the well water. The dissolved gas in the well water cannot be completely decompressed and separated. Recharging the well water containing gas into the ground will cause gas blockage in the aquifer. It is necessary to frequently pump and wash the well to eliminate the gas blockage in the aquifer before recharging. Because the water well and the recharge well need to be frequently exchanged for pumping and recharging, the water well and the recharge well can only be designed in the same way. After adopting the equal and continuous recharge system equipment of the present invention, the water well will always be used for water intake, and the recharge well will always be used for recharge. The water well and the recharge well can be designed according to the different functional requirements of the water well and the recharge well. The water wells and reinjection wells for medium-deep geothermal development are deep, and the well-drilling cost is high. Due to cost reasons, it is impossible to drill many cheap small-tube reinjection wells for reinjection like shallow wells. It is necessary to strive to rely on advanced well-drilling technology to ensure the continuous reinjection of the same amount of well water taken. The inventor has studied and practiced well water reinjection technology for 30 years and has accumulated rich theoretical and practical experience. In addition, in recent years, he has focused on the research of well-drilling technology for medium-deep geothermal development and accumulated a lot of design and construction skills. He believes that it is possible to fully utilize the favorable conditions of deep geothermal wells and large spans from top to bottom, make a big fuss about the reinjection well-drilling technology, and actively adopt advanced well-drilling technology. It can increase the reinjection volume of reinjection wells without increasing or reducing the cost of well-drilling, and ensure that the same amount of well water taken can be easily reinjected and reinjected for a long time. Actively adopting advanced well-drilling technology, strive to lower the static water level in the reinjection well, increase the natural reinjection pressure and increase the reinjection volume; strive to increase the water flow area of ​​the reinjection water, reduce the reinjection resistance and increase the reinjection volume, strive to reduce the power consumption of the booster pump head and save the operating costs of the water pump, strive to increase the water flow area, increase the heat exchange rate and maintain the thermal balance of the underground aquifer. This should become the higher pursuit of geothermal development companies, and change the current backward situation where water intake wells and reinjection wells are designed the same way as well as without any design and construction skills as soon as possible.

[0041] 4. In order to better understand the purpose of the inventor's patent disclosure technology, it is to provide geothermal development companies with a standardized design and construction model for geothermal stations, help everyone improve their ideological understanding, and abandon backward ideas and vague understandings. Because some people say that vacuum negative pressure reinjection can be achieved in sandstone, the inventor carefully studied and confirmed that it is to dig an inclined well, with the two wellheads on the top far apart and the two wellheads on the bottom close together. This is the same as the single well pumping and injection scheme for shallow wells to take water from the lower layer and inject it into the upper layer, and the well induced pumping and injection scheme that puts the water intake well and the injection well very close together. They all use the funnel area of ​​the water intake well to induce injection, and they are all short-process schemes for injection for injection. The injection water is pumped up without long-distance heat exchange in the underground aquifer, and the water intake temperature cannot be guaranteed to be stable for a long time. It is an opportunistic behavior and is extremely deceptive. Some people also say that we have limestone heat storage here, and injection is very easy. Two pumping and one injection can also achieve vacuum negative pressure injection. There are large gaps and even caves in the limestone. It is not a good thing to have too good penetration performance. The reinjection water is pumped up without sufficient heat exchange, and the long-term stability of the water intake temperature cannot be guaranteed. Vacuum negative pressure reinjection will inhale a lot of air and pollute the groundwater source. It is necessary to achieve full water micro-pressure reinjection and eliminate vacuum negative pressure reinjection. The development and utilization of geothermal energy is energy-saving and environmentally friendly, and we must also leave some good water for future generations. The geological conditions of limestone thermal storage are hard to come by, and relying on the weather is not a real skill. If you want to do a good job of equal and continuous reinjection of sandstone, you must thoroughly solve the three major blockage factors of gas blockage, sand blockage, and dirt blockage, actively adopt advanced well-making technology to increase the reinjection volume, and take the initiative in well water reinjection, so as to adapt to various hydrogeological conditions and ensure equal and long-term reinjection of well water.

[0042] The inventor disclosed the design and construction method of the equal-volume continuous recharge system of a geothermal station, and the design, manufacturing, installation and use method of two key equipment, a vacuum negative pressure unit with a constant temperature cooling water tank and an air-water separation and desander with a filter, in order to allow geothermal development companies to avoid detours and solve the problem of equal-volume continuous recharge of geothermal development well water as soon as possible.

[0043] The beneficial effects of this embodiment are:

[0044] The invention solves the problem that the existing technology cannot solve the problem that the sandstone aquifer in the middle and deep geothermal development cannot be continuously recharged in equal amounts.

[0045] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A design and construction method for an equal amount continuous recharge system for a geothermal station, wherein the equal amount continuous recharge system for a geothermal station is composed of: a closed water intake well (1), a submersible pump (2), a one-way valve (3), an exhaust pipe (4), a system controller (5), a vacuum negative pressure unit with a constant temperature cooling water tank (6), an air intake pipe (7), a cyclone desander (8), a small gas-water separator (9), a gas-water separation desander with a filter (10), a medium efficiency filter (11), a high efficiency filter (12), a heating heat exchanger (13), a heat pump heat exchanger (14), a booster pump (15), an electric valve (16) and a closed recharge well (17), and is characterized in that: The submersible pump (2) is arranged in a closed water intake well (1), and a one-way valve (3), a cyclone desander (8), a gas-water separation desander (10) with a filter, a medium-efficiency filter (11), a high-efficiency filter (12), a heating heat exchanger (13), a heat pump heat exchanger (14), a booster pump (15), and an electric valve (16) are sequentially installed in series on the outlet pipe of the submersible pump. A small gas-water separator (9) is installed between the inner and outer pipe interlayers under the cover of the closed recharge well (17) and at the highest point of the return pipe and all the desander filter barrel equipment. An air intake pipe (7) is installed between the inner and outer pipe interlayers under the cover of the closed water intake well (1), and a vacuum tank of a vacuum negative pressure unit (6) with a constant temperature cooling water tank is connected through the air intake pipe (7); the constant temperature cooling water tank The vacuum negative pressure unit (6) of the box is composed of: a chassis (6-1), a vacuum pump 1 (6-2), a vacuum pump 2 (6-3), a vacuum tank (6-4), a check valve (6-5), a ball valve (6-6), a system controller (5), an electric contact vacuum gauge (6-7), an exhaust pipe (6-8), an exhaust pipe (6-9), an exhaust hood (6-10), a fan (6-11), a heat exchanger (6-12), a spray chamber (6-13), a water supply pipe (6-14), a water tank (6-15), a drain pipe (6-16), a circulation pump (6-17), and a water diversion pipe (6-18); the system controller (5), the vacuum pump 1 (6-2), the vacuum pump 2 (6-3), the vacuum tank (6-4) and the system controller (5) are installed on the chassis (6-1). A constant temperature cooling water tank assembly consisting of an exhaust hood (6-10), a fan (6-11), a heat exchanger (6-12), a spray chamber (6-13), a water supply pipe (6-14), a water tank (6-15), a drain pipe (6-16), a circulation pump (6-17), and a water tank (6-15) is connected to a closed water intake well (1) through an air intake pipe (7) on one side of a vacuum tank (6-4); a check valve (6-5) and a ball valve (6-6) are provided on the air intake pipe (7); an air extraction pipe (6-9) is connected to the other side of the vacuum tank (6-4); the air extraction pipe (6-9) is connected to the air intake ports of vacuum pump 1 (6-2) and vacuum pump 2 (6-3); an electric contact vacuum gauge (6-7) is provided on the upper part of the vacuum tank (6-4); one end of the exhaust pipe (6-8) is connected to the vacuum pump 1 (6-2) and the vacuum pump 2 (6-3); an electric contact vacuum gauge (6-7) is provided on the upper part of the vacuum tank (6-4); and one end of the exhaust pipe (6-8) is connected to the vacuum pump 1 (6-2) and the vacuum pump 2 (6-3). It is connected to the air outlet of vacuum pump 1 (6-2) and vacuum pump 2 (6-3), and the other end is sent to the spray chamber (6-13). A heat exchanger (6-12) is arranged above the spray chamber (6-13). A fan (6-11) and an exhaust hood (6-10) are arranged above the heat exchanger (6-12). An exhaust pipe (4) is sleeved on the exhaust hood (6-10). A water tank (6-15) is arranged below the spray chamber (6-13). A water supply pipe (6-14) is connected to the barrel wall of the water tank (6-15). A drainage pipe (6-16), a circulation pump (6-17) and a water diversion pipe (6-18) are respectively connected to the bottom of the water tank (6-15). The water diversion pipe (6-18) is connected to the working fluid water inlet of vacuum pump 1 (6-2) and vacuum pump 2 (6-3).The air-water separation and sand removal device (10) with a filter is composed of: a water outlet pipe (10-1), a water inlet pipe (10-2), a hat-shaped air-water separator (10-3), a top cover (10-4), a barrel body (10-5), a quick-detachable flange (10-6), a funnel-shaped upper filter cloth (10-7), an upper bracket (10-8), a sand guide pipe (10-9), a lower bracket (10-10), a lower filter cloth (10-11), and a sand discharge port (10-12); a top cover (10-4) is arranged on the barrel body (10-5), a hat-shaped air-water separator (10-3) is arranged on the top cover (10-4), a quick-detachable flange (10-6) is arranged between the top cover (10-4) and the barrel body (10-5), and a barrel wall method is arranged on the upper part of one side of the barrel body (10-5). A water inlet pipe (10-2) is welded in the normal direction of the barrel wall at the lower part of the other side of the barrel body (10-5), a water outlet pipe (10-1) is welded in the normal direction of the barrel wall at the lower part of the barrel body (10-5), a funnel-shaped upper bracket (10-8) is provided between the water inlet pipe (10-2) and the water outlet pipe (10-1), a sand guide pipe (10-9) is welded below the upper bracket (10-8), an inverted funnel-shaped lower bracket (10-10) is welded below the sand guide pipe (10-9), a funnel-shaped upper filter cloth (10-7) is fixed on the upper bracket (10-8), an inverted funnel-shaped lower filter cloth (10-11) is fixed below the lower bracket (10-10), the water outlet pipe (10-1) is provided between the funnel-shaped upper filter cloth (10-7) and the lower filter cloth (10-11), and a sand discharge port (10-12) is provided below the lower bracket (10-10). ;

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