CN114704970B

CN114704970B - Design and construction method of equal volume continuous recharge system in geothermal station

Info

Publication number: CN114704970B
Application number: CN202110923705.0A
Authority: CN
Inventors: 丁祥
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-08
Filing date: 2021-08-08
Publication date: 2024-12-13
Anticipated expiration: 2041-08-08
Also published as: CN114704970A

Abstract

The invention discloses a design and construction method of an equivalent continuous recharging system of a geothermal station, which consists of a closed water taking 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 suction pipe, a cyclone sand remover, a small-sized gas-water separator, a gas-water separation sand remover 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 recharging well. The design construction method comprises a design construction method of an equivalent continuous recharging system of the geothermal station, and 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 sand remover with a filter, and a whole set of equivalent continuous recharging system of the geothermal station is formed by combining with the prior art equipment. The method solves the problem that the prior art cannot solve the problem that the sandstone aquifer for the deep geothermal development cannot be continuously recharged in an equivalent amount.

Description

Design and construction method for equivalent continuous recharging system of geothermal station

Technical Field

The invention relates to the technical field of water intake recharging in middle-deep geothermal development, in particular to a design and construction method of an equivalent continuous recharging system of a geothermal station.

Background

Because the geothermal energy is green and low-carbon and can be recycled, the method has the characteristics of large reserve, wide distribution, stability, reliability and the like, and the method utilizes the geothermal energy to generate electricity in areas with rich high-temperature geothermal resources, and utilizes the geothermal energy to heat in areas with rich medium-low-temperature geothermal resources, thereby having positive significance for improving the energy structure of China, promoting the high-quality development and realizing the carbon peak value and carbon neutralization.

The national geothermal energy center organizes the domestic geothermal industry around 2020 to comb the core key technology restricting geothermal energy development, and 23 neck technologies are combed in total, and the important point is that the recharging technology is still a short plate so far. The national academy of sciences geology and geophysics institute geothermal resource research center is mainly about Pang Zhong and points out that for some neck problems, such as no water from heat extraction, low sandstone recharging efficiency and the like, concentrated attack is required.

The main difficulty of the medium-deep geothermal water recharging is sandstone recharging, and in order to solve the same amount of continuous recharging problem of sandstone aquifer, various blocking factors affecting sandstone recharging must be thoroughly solved. Because the sandstone aquifer has fine infiltration flow channels, air blockage, sand blockage and oxide microorganism filth blockage are easy, the recharging amount is continuously attenuated, and the equal amount of recharging can not be continuously performed.

Because the top of the traditional cyclone sand remover is not provided with a large-displacement automatic exhaust valve which is not afraid of well water oxide dirt blockage, in order to prevent top air accumulation, the traditional cyclone sand remover can only enter downwards and eject out, and the decompressed bubbles are taken away along with water flow, so that the traditional cyclone sand remover has no degassing function. Because well water in the barrel body upwards swirls, only larger particle silt can break through the upward swirled water flow lift force to downwards precipitate by means of self weight, and fine silt is taken away by water flow, so that the sand removal efficiency of the traditional cyclone sand remover is very low. In order to prevent mud and sand from blocking recharging wells and underground aquifers, the enterprises which are made better at present start to strictly filter the mud and sand in well water by adopting low, medium and high-efficiency three-stage filters, but because the three-stage filters have large resistance, the consumed water pump has large lift and the water pump has high running cost, and because the replacement and cleaning of filter cloth are more troublesome, the gas-water separation sand remover with the filters is urgently needed to lighten the filtering burden.

It is also known that well water contains various chemical ions, and oxidation reaction occurs when the well water contacts with air, because the exhaust port of a common automatic exhaust valve is small and is easily blocked by well water oxide, so that the geothermal development industry does not have an automatic exhaust valve which is not afraid of well water oxide blocking until now. Few geothermal development enterprises have realized that the recharging pressure is continuously increased, the recharging quantity is smaller and smaller, the recharging quantity is caused by gas blocking underground aquifer, a middle tank is adopted to remove the gas in well water, because a large-displacement unidirectional automatic exhaust valve which is not afraid of blocking of well water oxide and is not a small-sized gas-water separator can be used, the electric valve at the top of the tank body can be controlled to intermittently exhaust only by means of a liquid level contact switch, the air accumulation at the upper part of the tank body is completely controlled, the water level in the tank is pressed to drop to a certain position to enable the air to be exhausted, uninterrupted automatic exhaust cannot be achieved, the time of the air-water interface in the tank body is high, the time of the air-water interface in the tank body is low, and the time difference of the decompression degassing effect is good. Because the vacuum negative pressure unit with the constant temperature cooling water tank is not adopted to suck vacuum in the closed water taking well, the well hydrolysis pressure degassing cannot be forced, the gas-water separation sand remover with the filter is not adopted to sufficiently decompress and degas, and the dissolved gas in the well water cannot be completely decompressed and separated. In addition, the recharging well mouth does not adopt a small gas-water separator for automatic exhaust, can not remove residual gas in incoming water, can not remove underground gas, can only complete a fraction of decompression and degassing work, can not thoroughly solve the problem of gas blockage of an underground aquifer, can only reduce the times of pumping back and flushing, and can not meet the requirement of long-term continuous recharging of well water without pumping back and flushing.

Moreover, no reliable degassing equipment is used for forced well hydrolysis pressure degassing in the past, most geothermal development enterprises adopt open well water taking and open well recharging, the open well is completely relied on for natural decompression degassing, and the recharging amount is very small due to the fact that natural recharging is completely relied on. Because no reliable degassing equipment is used for forced well water pressure degassing, gas in well water cannot be decompressed and separated, in order to implement pressurized recharging and improve recharging quantity, only a high-lift booster pump can be used for overcoming air resistance of pipeline equipment and a recharging well mouth, well water containing gas is forced to recharge underground, and the booster pump is high in lift, power consumption and operation cost. The well water containing the gas is forcibly recharged into the underground, so that the gas in the permeation flow channel of the underground aquifer is blocked, and the well must be frequently lifted to eliminate the gas blockage of the underground aquifer.

It is also known that no reliable degassing equipment can be used in the past, only open well water taking and open well recharging can be adopted, well water has the opportunity of contacting with air, various chemical ions in the well water are subjected to oxidation reaction, sticky oxides are generated, suspended sediment is generated, and the recharging well and an underground aquifer are blocked. And then, the well is pumped back and washed, so that the air blockage of the underground aquifer can be eliminated temporarily, the filth blockage of oxide microorganisms can not be removed, and the problem of attenuation of the recharging amount can not be thoroughly solved. A few geothermal development enterprises have recognized the importance of closed water taking and closed pressurized recharging, in order to prevent the oxidation reaction of well water, a well lid is adopted to seal the water taking well and the recharging well for water taking recharging, but because no reliable well hydrolysis pressure degassing equipment can be used, dissolved gas in the well water cannot be completely decompressed and separated, and only a high-lift water pump can be adopted to forcedly recharge the well water containing the gas into the ground, so that the result is considered.

In summary, among three blocking factors of air blocking, sand blocking and oxide microorganism filth blocking, which lead to the attenuation of the recharging amount of sandstone, because sand blocking is easier to understand, geothermal development enterprises attach importance to the sand blocking, various well water filtering devices on the market can be selected, and the problem of sand blocking can be solved through strict filtration. The conventional problem of the air blockage is not solved well because the air blockage is not paid attention to. According to the analysis, the problem of the air blockage of the underground aquifer is the most important, because the air blockage of the underground aquifer causes the recharging amount to be attenuated, the recharging amount is faster than the sand blockage of the viscera, the hazard effect is more obvious, and the problem needs to be solved first. Oxide microorganisms become clogged more slowly, but are fatal to recharging wells because the recharging ability cannot be fully restored after the aquifer surrounding the recharging well is clogged, regardless of the flushing. Only a whole set of well water degassing and sand removing equipment is adopted to carry out closed water taking and water returning, so that three blocking factors can be fundamentally solved.

Disclosure of Invention

In order to help geothermal development industry thoroughly solve the problem of water recharging in deep geothermal development well, the invention discloses a design and construction method of geothermal station equivalent continuous recharging system,

The invention mainly discloses a design and construction method of an equivalent continuous recharging system of a geothermal station, provides a whole set of design and construction method of the equivalent continuous recharging system of the geothermal station for geothermal development enterprises, discloses a design, manufacture, installation and use method of a vacuum negative pressure unit with a constant temperature cooling water tank in the equivalent continuous recharging system of the geothermal station, and discloses a design, manufacture, installation and use method of a gas-water separation sand remover with a filter in the equivalent continuous recharging system of the geothermal station.

The geothermal station equivalent continuous recharging system design construction method 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 (6) with a constant temperature cooling water tank, an air suction pipe (7), a cyclone sand remover (8), a small-sized gas-water separator (9), a gas-water separation sand remover (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), an electric valve (16) and a closed recharging well (17), and is characterized in that the submersible pump (2) is arranged in the closed water intake well (1), and the one-way valve (3) is sequentially and serially arranged on the submersible pump water outlet pipe, The cyclone sand remover (8), a gas-water separation sand remover (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 pressurizing pump (15) and an electric valve (16), wherein a small gas-water separator (9) is arranged between an inner pipe clamping layer and an outer pipe clamping layer below a well lid of a closed recharging well (17) and between a water return pipe and the highest point of all sand removal filtering barrel body equipment, an air suction pipe (7) is arranged between the inner pipe clamping layer and the outer pipe clamping layer below the well lid of the closed water taking well (1), the air suction pipe (7) is connected with a vacuum tank of a vacuum negative pressure unit (6) with a constant temperature cooling water tank through the air suction pipe (7), and the vacuum negative pressure unit (6) with the constant temperature cooling water tank is formed by a chassis (6-1), The vacuum pump I (6-2), the vacuum pump II (6-3), the vacuum tank (6-4), the check valve (6-5), the ball valve (6-6), the system controller (5), the electric joint vacuum meter (6-7), the exhaust pipe (6-8), the exhaust pipe (6-9), the exhaust hood (6-10), the fan (6-11), the heat exchanger (6-12), the spray chamber (6-13), the water supplementing pipe (6-14), the water tank (6-15), the water draining pipe (6-16), the circulating pump (6-17) and the water diversion pipe (6-18), wherein the system controller (5), the vacuum pump I (6-2), the water supplementing pipe (6-14), the water draining pipe (6-16) and the water diversion pipe (6-18) are arranged on the chassis (6-1), The vacuum pump II (6-3), the vacuum tank (6-4) and the constant temperature cooling water tank component consisting of the exhaust hood (6-10), the fan (6-11), the heat exchanger (6-12), the spray chamber (6-13), the water supplementing pipe (6-14), the water tank (6-15), the drain pipe (6-16), the circulating pump (6-17) and the water tank (6-15), wherein one side of the vacuum tank (6-4) is connected with the closed water intake well (1) through the air suction pipe (7), the check valve (6-5) is arranged on the air suction pipe (7), ball valve (6-6), air suction pipe (6-9) is connected to the other side of vacuum tank (6-4), air suction pipe (6-9) is connected to the air suction port of vacuum pump one (6-2) and vacuum pump two (6-3), electric joint vacuum meter (6-7) is arranged on the upper portion of vacuum tank (6-4), one end of air exhaust pipe (6-8) is connected with air outlets of vacuum pump one (6-2) and vacuum pump two (6-3), the other end is fed into spray chamber (6-13), heat exchanger (6-12) is arranged above spray chamber (6-13), fan (6-11) and exhaust hood (6-10) are arranged above heat exchanger (6-12), exhaust pipe (4) is sleeved on exhaust hood (6-10), water tank (6-15) is arranged below spray chamber (6-13), water supplementing pipe (6-14) is connected to the wall of water tank (6-15), drain pipes (6-16) are respectively connected to the bottom of water tank (6-15), The gas-water separation sand remover (10) with the filter comprises a water outlet pipe (10-1), a water inlet pipe (10-2), a cap-shaped gas-water separator (10-3), a top cover (10-4), a barrel body (10-5), a quick-dismantling 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), a gas-water separation sand remover (10-1) with the filter, a water inlet pipe (10-2), a cap-shaped gas-water separator (10-3), a top cover (10-4), a barrel body (10-5), a quick-dismantling flange (10-6), a funnel-shaped upper filter cloth (10-7), an upper bracket (10-8), a sand guide pipe (10-9), The sand discharge device comprises a sand discharge port (10-12), a top cover (10-4) arranged on a barrel body (10-5), a cap-shaped gas-water separator (10-3) arranged on the top cover (10-4), a quick disassembly flange (10-6) arranged between the top cover (10-4) and the barrel body (10-5), a water inlet pipe (10-2) welded in the normal direction of the barrel wall at the upper part of one side of the barrel body (10-5), a water outlet pipe (10-1) welded in the normal direction of the barrel wall at the lower part of the other side of the barrel body (10-5), a funnel-shaped upper bracket (10-8) arranged between the water inlet pipe (10-2) and the water outlet pipe (10-1), a sand guide pipe (10-9) welded below the upper bracket (10-8), a reverse funnel-shaped lower bracket (10-10) welded below the sand guide pipe (10-9), a funnel-shaped upper filter cloth (10-7) fixed above the upper bracket (10-8), a reverse funnel-shaped lower filter cloth (10-11) fixed below the lower bracket (10-1), a water outlet pipe (10-1) arranged between the upper bracket (10-7) and the lower filter cloth (10-11) and a sand discharge port arranged below the lower bracket (10-12).

The design and construction method of the geothermal station equivalent continuous recharging system comprises the design and construction method of the geothermal station equivalent continuous recharging system, and the design, manufacture, installation and use methods of a vacuum negative pressure unit (6) with a constant temperature cooling water tank and a gas-water separation sand remover (10) with a filter,

1. Design and construction method for equivalent continuous recharging system of geothermal station

The geothermal station equivalent continuous recharging system consists 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 (6) with a constant temperature cooling water tank, an air suction pipe (7), a cyclone sand remover (8), a small-sized gas-water separator (9), a gas-water separation sand remover (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), an electric valve (16) and a closed recharging well (17), wherein the geothermal station equivalent continuous recharging system design construction method comprises the steps of adopting the vacuum negative pressure unit (6) with the constant temperature cooling water tank to suck vacuum for a space above a dynamic water level in the closed water intake well (1), adopting the gas-water separation sand remover (10) with the filter to fully decompose pressure and degasify well water, adopting the small-sized gas-water separator (9) to be installed at a wellhead of the closed recharging well and a highest point of the closed recharging well to automatically exhaust, preventing the pressurized recharging well wellhead from generating gas blockage, the closed automatic sand remover (8), the medium-efficiency filter (11) and the high-efficiency filter (12), the sand removal filtering barrel body equipment has decompression and degassing functions, comprises a one-way valve (3) arranged on a water outlet pipe of a submersible pump (2) to prevent well water from flowing backwards after the submersible pump (2) is stopped, an electric valve (16) arranged on a wellhead water return pipe of a closed recharging well (17) to ensure that the submersible pump (2) synchronously runs, and a geothermal station water system is prevented from being emptied of well water after the submersible pump (2) is stopped;

2. design, manufacture, installation and use method of vacuum negative pressure unit (6) with constant-temperature cooling water tank

The vacuum negative pressure unit (6) with the constant temperature cooling water tank is composed of a chassis (6-1), a first vacuum pump (6-2), a second vacuum pump (6-3), a vacuum tank (6-4), a check valve (6-5), a ball valve (6-6), a system controller (5), an electric joint vacuum meter (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 supplementing pipe (6-14), a water tank (6-15), a drain pipe (6-16), a circulating pump (6-17), a water tank (6-17) and a water tank (6-17), All the devices of the vacuum negative pressure unit (6) with the constant temperature cooling water tank are arranged on the chassis (6-1), the air inlet pipes of the vacuum pump I (6-2) and the vacuum pump II (6-3) are connected in parallel on the air suction pipe (6-9) to suck vacuum into the vacuum tank (6-4), the vacuum tank (6-4) pumps vacuum into the closed water intake well (1) through the air suction pipe (7), the ball valve (6-6) is arranged on the air suction pipe (7), the ball valve (6-6) is opened when the vacuum negative pressure unit (6) with the constant temperature cooling water tank needs to be started, the ball valve (6-6) is closed when the vacuum negative pressure unit (6) with the constant temperature cooling water tank does not need to be started, the check valve (6-5) is arranged on the air suction pipe (7), after the vacuum negative pressure unit (6) with the constant temperature cooling water tank is stopped, and the water level in the closed water intake well (1) is pulled down rapidly in the initial operation stage of the submersible pump (2), when the vacuum degree in the closed water intake well (1) is higher than that in the vacuum tank (6-4), the check valve (6-5) is closed automatically, when the vacuum degree in the closed water intake well (1) is started, the vacuum valve (6-5) is opened automatically, the vacuum valve (6-5) is closed when the vacuum valve (6-4) is higher than the vacuum degree in the vacuum water intake well (1) is controlled, the vacuum valve is opened when the vacuum valve (6-6 is closed, the vacuum valve is closed and the vacuum valve is opened, simultaneously supplying the first vacuum pump (6-2), A fan (6-11), a circulating pump (6-17), The electric joint vacuum meter (6-7) supplies power, the fan (6-11) directly operates, the first vacuum pump (6-2) operates according to the instruction of the electric joint vacuum meter (6-7), when the vacuum degree in the vacuum tank (6-4) reaches the upper limit pointer position of the electric joint vacuum meter (6-7), the electric joint vacuum meter (6-7) sends an instruction to the system controller (5) to enable the first vacuum pump (6-2) to stand by, when the vacuum degree in the vacuum tank (6-4) is lower than the lower limit pointer position of the electric joint vacuum meter (6-7), the electric joint vacuum meter (6-7) sends an instruction to the system controller (5) to enable the first vacuum pump (6-2) to be started, the second vacuum pump (6-3) is used as a standby pump, when the system controller (5) is started by a power key, the second vacuum pump (6-3) is required to be shut down, when the second vacuum pump (6-3) is required to participate in the system controller (5), the second vacuum pump (6-3) is also required to be started by the system controller (5), when the second vacuum pump (6-3) is not required to operate by the power key (6-3), the second vacuum pump (6-3) is required to be started by the system controller when the second vacuum pump (6-3) is required to be started, the submersible pump (2) is powered on and started after a delay of 60 seconds, meanwhile, the electric valve (16) is powered on, the submersible pump (2) is powered off and stopped according to the submersible pump key on the system controller (5), the submersible pump (2) is powered off and stopped simultaneously, the electric valve (16) is powered off and stopped simultaneously, when the power key on the system controller (5) is started, the default pressurizing pump is powered off and stopped, the pressurizing pump (15) is required to be operated, the pressurizing pump key on the system controller (5) is pressed, the pressurizing pump (15) is powered on and operated, the pressurizing pump (15) is operated according to the pressurizing pump key, the power-off stopping of the pressurizing pump (15), the air outlet pipes of the first vacuum pump (6-2) and the second vacuum pump (6-3) are connected in parallel to the exhaust pipe (6-8), the air and working fluid pumped out by the first vacuum pump (6-2) and the second vacuum pump (6-3) are fed into the spray chamber (6-13), the air is sucked by the fan (6-11), the air is discharged outdoors through the pressurizing pump (6-10) and the exhaust pipe (4), the liquid is dripped into the water tank (6-15) below the system controller (6-15), when the water temperature of the circulating pump (6-17) is controlled by the circulating pump (6-17) is controlled to be automatically controlled to be higher than the water temperature of the system (5), when the system controller (5) detects that the water temperature in the water tank (6-15) is lower than 28 ℃, the circulating pump (6-17) automatically stands by, the water supplementing pipe (6-14) on the water tank (6-15) is connected with a running water pipe, and is connected with the floating ball valve in the water tank (6-15) to automatically supplement water, when the circulating pump (6-17) runs, water is pumped from the water tank (6-15), the water outlet pipe of the circulating pump (6-17) is connected with the water inlet of the heat exchanger (6-12), the water outlet pipe of the heat exchanger (6-12) is fed into the water tank (6-15), the working fluid water inlets of the first vacuum pump (6-2) and the second vacuum pump (6-3) are connected with the water outlet of the bottom of the water tank (6-15) through the water conduit (6-18), because the water surface in the water tank (6-15) is higher than the working fluid water inlets of the first vacuum pump (6-2) and the second vacuum pump (6-3), the sewage can be always absorbed into the water, so that the sewage can meet the requirements of opening the high temperature of the first vacuum pump (6-2) and the second vacuum pump (6-3) and the water outlet pipe (6-3), the vacuum negative pressure unit (6) with the constant temperature cooling water tank is specially designed for middle-deep geothermal development, because the temperature of the middle-deep geothermal water is high and is 60-80 ℃, the temperature of gas decompressed and separated from the geothermal water is also high, and the dissolved gas in the middle-deep geothermal water is more, the water ring vacuum pump has long starting time, large friction heat and high working fluid temperature, and a circulating pump (6-17) is needed, A fan (6-11), The heat exchanger (6-12) is used for forced cooling and temperature reduction, because the density of water is higher when the water temperature is lower, the vacuum pumping efficiency is higher, the intelligent management circulating pump (6-17) of the system controller (5) is used for constant-temperature self-control operation, the working fluid water source water temperature in the water tank is ensured not to exceed the standard, the long-term efficient and stable operation of the water ring vacuum pump can be ensured, the fan (6-11) on the top of the constant-temperature cooling water tank is utilized for discharging the decompressed and separated toxic and harmful gas to the outside through the exhaust pipe (4), the fresh air ventilation purpose in a machine room is achieved, the system controller (5) is specially designed for a geothermal station equivalent continuous recharging system, and the intelligent control operation management of all fans of the water taking recharging system, The starting-up/stopping sequence of the water pump and the vacuum pump is that the gas decompressed and separated in the geothermal water is toxic and harmful gas and is highly corrosive gas and flammable and explosive gas, so that the safety of indoor personnel and house equipment is protected, the process flow management needs are met, and the program control management is needed;

3. design, manufacture, installation and use method of gas-water separation sand remover (10) with filter

The gas-water separation sand remover (10) with the filter comprises a water outlet pipe (10-1), a water inlet pipe (10-2), a cap-shaped gas-water separator (10-3), a top cover (10-4), a barrel body (10-5), a quick-disassembly 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 top cover (10-4) is arranged on the barrel body (10-5), a cap-shaped gas-water separator (10-3) is arranged on the top cover (10-4), a quick disassembly flange (10-6) is arranged between the top cover (10-4) and the barrel body (10-5), a water inlet pipe (10-2) is welded in the normal direction of the barrel wall at the upper part of one 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 other side of the barrel body (10-5), a funnel-shaped upper bracket (10-8) is arranged 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), an inverted funnel-shaped upper filter cloth (10-7) is fixed above the upper bracket (10-8), an inverted funnel-shaped lower (10-11) is fixed below the lower bracket (10-10), a water outlet pipe (10-1) is arranged between the upper filter cloth (10-11), the sand discharge port (10-12) is arranged below the lower bracket (10-10), and because the funnel-shaped upper filter cloth (10-7) and the upper bracket (10-8) are additionally arranged 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 water flow, and can be sent to the bottom of the cone through the sand guide pipe (10-9), so that the self-flushing function is realized, and cakes are not easy to accumulate. Because the lower part of the sand guide pipe (10-9) is provided with the inverted funnel-shaped lower filter cloth (10-11) and the lower bracket (10-10) to prevent the muddy sand from returning upwards, the inside of the water outlet pipe (10-1) can be ensured to have no muddy sand with the particle size larger than 50um, because the quick detaching flange (10-6) is arranged between the top cover (10-4) and the barrel body (10-5), the top cover (10-4) is convenient to be frequently opened for checking and replacing the cleaning filter cloth, because the upper bracket (10-8), the lower bracket (10-10) and the sand guide pipe (10-9) are welded into a whole, the whole is taken out to fix the funnel-shaped upper filter cloth (10-7) and the lower filter cloth (10-11) and put in again, the cleaning filter cloth can be integrally taken out to replace the muddy sand, the diameter of the barrel body (10-5) is greatly increased, the flow rate of well water is further slowed down, the cap-shaped air-water separator (10-3) is arranged on the top cover (10-4), the bubbles released in the well water is slowly in the process are collected and separated in time, the well water separation is realized, the automatic deaeration efficiency is high, the traditional cyclone-type air separator is not capable of being completely separated, and the top cover-4 is not designed to be completely separated, and the upper cyclone-down water inlet and down cyclone-down is fully can not be completely discharged, and the upper cyclone-down is completely separated, and the upper and lower cyclone-down is completely discharged, and the top-down because the top cyclone-down is not discharged down, and the top filter is completely separated, and down, Centrifugal force and silt particle gravity, three-force synthesis guide silt particle cyclone sediment downwards become a cyclone desander that sand removal efficiency is very high, because positive funnel and fall funnel filter are adopted, become a large-scale self-flushing primary filter, because staving diameter is big, the filter cloth area is big, the water resistance is little, the water pump lift of consumption is little, reduces water pump lift consumption by a wide margin, saves primary filter investment.

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

The advantages and features of the invention are described in detail below.

Drawings

FIG. 1 is a schematic diagram of a geothermal station equivalent continuous recharging system of the present invention;

FIG. 2 is a schematic structural diagram of a vacuum negative pressure unit with a constant temperature cooling water tank;

FIG. 3 is a schematic block diagram of a gas-water separator with a filter according to the present invention;

In the figure, 1, a closed water intake well 2, a submersible pump 3, a one-way valve 4, an exhaust pipe 5, a system controller 6, a vacuum negative pressure unit 7 with a constant temperature cooling water tank, an air suction pipe 8, a cyclone sand remover 9, a small gas-water separator 10, a gas-water separator with a filter 11, a medium efficiency filter 12, a high efficiency filter 13, a heating heat exchanger 14, a heat pump heat exchanger 15, a booster pump 16, an electric valve 17, a closed recharging well 6-1, a chassis 6-2, a vacuum pump 6-3, a vacuum pump 6-4, a vacuum tank 6-5, a check valve 6-6, a ball valve 6-7, an electric joint vacuum table 6-8, an exhaust pipe 6-9, an exhaust pipe 6-10, an exhaust hood 6-11, a fan 6-12, a heat exchanger 6-13, a spray chamber 6-14, a water supplementing pipe 6-15, a water tank 6-16, a water draining pipe 6-17, a circulating pump 6-18, a water draining pipe 10-1, a water draining pipe 10-2, a cap 10-3, a gas-water separator 10-4, a top cover 10-5, a top cover 10-7, a filter cloth 10-10, a quick-7, a filter cloth carrier 10-10, a filter cloth carrier 10 and a filter cloth carrier 10

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the invention.

In the following description, a detailed structure will be presented for a thorough understanding of the present invention. It will be apparent that the invention is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments in addition to these detailed descriptions.

The following describes embodiments of the present invention in detail.

Referring to the figures 1-3, the geothermal station equivalent continuous recharging system design construction method 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 (6) with a constant temperature cooling water tank, an air suction pipe (7), a cyclone sand remover (8), a small-sized gas-water separator (9), a gas-water separation sand remover (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 pressurizing pump (15), an electric valve (16) and a closed recharging well (17), and is characterized in that the submersible pump (2) is arranged in the closed water intake well (1), and the one-way valve (3) is sequentially and serially arranged on the submersible pump water outlet pipe, The cyclone sand remover (8), a gas-water separation sand remover (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 pressurizing pump (15) and an electric valve (16), wherein a small gas-water separator (9) is arranged between an inner pipe clamping layer and an outer pipe clamping layer below a well lid of a closed recharging well (17) and between a water return pipe and the highest point of all sand removal filtering barrel body equipment, an air suction pipe (7) is arranged between the inner pipe clamping layer and the outer pipe clamping layer below the well lid of the closed water taking well (1), the air suction pipe (7) is connected with a vacuum tank of a vacuum negative pressure unit (6) with a constant temperature cooling water tank through the air suction pipe (7), and the vacuum negative pressure unit (6) with the constant temperature cooling water tank is formed by a chassis (6-1), The vacuum pump I (6-2), the vacuum pump II (6-3), the vacuum tank (6-4), the check valve (6-5), the ball valve (6-6), the system controller (5), the electric joint vacuum meter (6-7), the exhaust pipe (6-8), the exhaust pipe (6-9), the exhaust hood (6-10), the fan (6-11), the heat exchanger (6-12), the spray chamber (6-13), the water supplementing pipe (6-14), the water tank (6-15), the water draining pipe (6-16), the circulating pump (6-17) and the water diversion pipe (6-18), wherein the system controller (5), the vacuum pump I (6-2), the water supplementing pipe (6-14), the water draining pipe (6-16) and the water diversion pipe (6-18) are arranged on the chassis (6-1), The vacuum pump II (6-3), the vacuum tank (6-4) and the constant temperature cooling water tank component consisting of the exhaust hood (6-10), the fan (6-11), the heat exchanger (6-12), the spray chamber (6-13), the water supplementing pipe (6-14), the water tank (6-15), the drain pipe (6-16), the circulating pump (6-17) and the water tank (6-15), wherein one side of the vacuum tank (6-4) is connected with the closed water intake well (1) through the air suction pipe (7), the check valve (6-5) is arranged on the air suction pipe (7), ball valve (6-6), air suction pipe (6-9) is connected to the other side of vacuum tank (6-4), air suction pipe (6-9) is connected to the air suction port of vacuum pump one (6-2) and vacuum pump two (6-3), electric joint vacuum meter (6-7) is arranged on the upper portion of vacuum tank (6-4), one end of air exhaust pipe (6-8) is connected with air outlets of vacuum pump one (6-2) and vacuum pump two (6-3), the other end is fed into spray chamber (6-13), heat exchanger (6-12) is arranged above spray chamber (6-13), fan (6-11) and exhaust hood (6-10) are arranged above heat exchanger (6-12), exhaust pipe (4) is sleeved on exhaust hood (6-10), water tank (6-15) is arranged below spray chamber (6-13), water supplementing pipe (6-14) is connected to the wall of water tank (6-15), drain pipes (6-16) are respectively connected to the bottom of water tank (6-15), The gas-water separation sand remover (10) with the filter comprises a water outlet pipe (10-1), a water inlet pipe (10-2), a cap-shaped gas-water separator (10-3), a top cover (10-4), a barrel body (10-5), a quick-dismantling 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), a gas-water separation sand remover (10-1) with the filter, a water inlet pipe (10-2), a cap-shaped gas-water separator (10-3), a top cover (10-4), a barrel body (10-5), a quick-dismantling flange (10-6), a funnel-shaped upper filter cloth (10-7), an upper bracket (10-8), a sand guide pipe (10-9), The sand discharge port (10-12) comprises a top cover (10-4) arranged on a barrel body (10-5), a cap-shaped gas-water separator (10-3) arranged on the top cover (10-4), a quick disassembly flange (10-6) arranged between the top cover (10-4) and the barrel body (10-5), a water inlet pipe (10-2) welded in the normal direction of the barrel wall at the upper part of one side of the barrel body (10-5), a water outlet pipe (10-1) welded in the normal direction of the barrel wall at the lower part of the other side of the barrel body (10-5), a funnel-shaped upper bracket (10-8) arranged between the water inlet pipe (10-2) and the water outlet pipe (10-1), a sand guide pipe (10-9) welded below the upper bracket (10-8), a reverse funnel-shaped lower bracket (10-10) welded below the sand guide pipe (10-9), a funnel-shaped upper filter cloth (10-7) fixed above the upper bracket (10-8), a reverse funnel-shaped lower filter cloth (10-11) fixed below the lower bracket (10-1), a water outlet pipe (10-1) arranged between the upper bracket (10-7) and the lower filter cloth (10-11) and the sand discharge port (10-12) arranged below the lower bracket.

The gas-water separation sand remover (10) with the filter comprises a water outlet pipe (10-1), a water inlet pipe (10-2), a cap-shaped gas-water separator (10-3), a top cover (10-4), a barrel body (10-5), a quick-disassembly 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 top cover (10-4) is arranged on the barrel body (10-5), a cap-shaped gas-water separator (10-3) is arranged on the top cover (10-4), a quick disassembly flange (10-6) is arranged between the top cover (10-4) and the barrel body (10-5), a water inlet pipe (10-2) is welded in the normal direction of the barrel wall at the upper part of one 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 other side of the barrel body (10-5), a funnel-shaped upper bracket (10-8) is arranged 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), an inverted funnel-shaped upper filter cloth (10-7) is fixed above the upper bracket (10-8), an inverted funnel-shaped lower (10-11) is fixed below the lower bracket (10-10), a water outlet pipe (10-1) is arranged between the upper filter cloth (10-11), the sand discharge port (10-12) is arranged below the lower bracket (10-10), and because the funnel-shaped upper filter cloth (10-7) and the upper bracket (10-8) are additionally arranged between the water inlet pipe (10-2) and the water outlet pipe (10-1), the filtered silt can enter the central hole along with water flow, and can be sent to the bottom of the cone through the sand guide pipe (10-9), so that the self-flushing function is realized, and cakes are not easy to accumulate. Because the lower part of the sand guide pipe (10-9) is provided with the inverted funnel-shaped lower filter cloth (10-11) and the lower bracket (10-10) to prevent the muddy sand from returning upwards, the inside of the water outlet pipe (10-1) can be ensured to have no muddy sand with the particle size larger than 50um, because the quick detaching flange (10-6) is arranged between the top cover (10-4) and the barrel body (10-5), the top cover (10-4) is convenient to be frequently opened for checking and replacing the cleaning filter cloth, because the upper bracket (10-8), the lower bracket (10-10) and the sand guide pipe (10-9) are welded into a whole, the whole is taken out to fix the funnel-shaped upper filter cloth (10-7) and the lower filter cloth (10-11) and put in again, the cleaning filter cloth can be integrally taken out to replace the muddy sand, the diameter of the barrel body (10-5) is greatly increased, the flow rate of well water is further slowed down, the cap-shaped air-water separator (10-3) is arranged on the top cover (10-4), the bubbles released in the well water is slowly in the process are collected and separated in time, the well water separation is realized, the automatic deaeration efficiency is high, the traditional cyclone-type air separator is not capable of being completely separated, and the top cover-4 is not designed to be completely separated, and the upper cyclone-down water inlet and down cyclone-down is fully can not be completely discharged, and the upper cyclone-down is completely separated, and the upper and lower cyclone-down is completely discharged, and the top-down because the top cyclone-down is not discharged down, and the top filter is completely separated, and down, Centrifugal force and silt particle gravity, three-force synthesis guide silt particle cyclone sediment downwards become a cyclone desander that sand removal efficiency is very high, because positive funnel and fall funnel filter are adopted, become a large-scale self-flushing primary filter, because staving diameter is big, the filter cloth area is big, the water resistance is little, the water pump lift of consumption is little, reduces water pump lift consumption by a wide margin, saves primary filter investment.

Further description will be made:

1. the national regulation is to determine the water intake of the water intake well according to the recharging amount of the recharging well, and the recharging is not allowed to be performed. Because the sandstone aquifer can not be recharged by 100% due to the limitation of the prior art, the country can only prescribe that geothermal development enterprises with recharging rate lower than 80% do not generate geothermal exploitation licenses, and the geothermal development enterprises are forced to strive to improve recharging rate with water cost price. The method is characterized in that the tax of geothermal resources is collected in 2021, well water which can be recharged is very cheap, only 1-element geothermal resource tax is collected per cube, well water which cannot be recharged is very expensive, 20-30-element geothermal resource tax is collected per cube, and the recharging rate is lower than 80% which is not profitable for geothermal development enterprises. The country uses water cost price to force geothermal development enterprises to improve recharging rate, can thoroughly solve the difficult problem of recharging well water to realize 100% recharging of the well water, and becomes the key of survival and development of geothermal energy development enterprises. The invention provides a design construction method of an equivalent continuous recharging system of a geothermal station, and a design manufacturing and installation using method of related equipment, which aims to help deep geothermal development enterprises solve the problem of the recharging amount attenuation of sandstone aquifer, and achieve the purpose of ensuring 100% equivalent recharging and long-term continuous recharging of well water without lifting a well, thus being the primary problem to be solved by all geothermal development enterprises at present.

2. In order to better understand the importance of the design and construction method of the equivalent continuous recharging system of the geothermal station, it is necessary to know which gases are contained in the deep geothermal water. The buried depth of the middle-deep geothermal water is 1-3 km, the pressure is born for a long time to 100-300 times, and the content of dissolved gas in the geothermal water is high due to long-term high temperature and high pressure. Gases in geothermal water can be divided into two main types, namely water-soluble gases and water-insoluble gases, wherein the water-insoluble gases under the general geological conditions account for less than 10% of the total gases, and more than 90% of the gases are water-soluble gases. The water-insoluble gas mainly includes single-working-medium gases such as hydrogen H2 and nitrogen N2, and organic gases such as methane CH4, C2H4 and C2H2 with relatively simple molecular structures. The water-soluble gas mainly includes 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 a few of the methane organic gases with heavy oil gas can account for more than 50% of the total gas. The volume of the gas which is not dissolved in water is compressed to 100-300 times under the condition of 100-300 pressure, and the gas can be naturally decompressed out along with the pressure decrease of the water in the rising process in the water taking well. The gas dissolved in water cannot be naturally decompressed out along with the pressure drop of the water in the rising process of the water taking well. Because of the long-term high-temperature high-pressure effect, chemical bond connection exists between gas molecules dissolved in water and water molecules, only a vacuum negative pressure unit (6) with a constant-temperature cooling water tank is adopted to suck vacuum in a closed water taking well (1), well water is forced to decompress and degas in a vacuum negative pressure environment, meanwhile, the possibility of violent collision between water molecules is realized by stirring with a submersible pump (2) and rapid flowing in a pipeline, the huge gas-water separator such as a gas-water separation sand separator (10) with a filter is adopted to perform pressurizing and degassing, and the small gas-water separator (9) is adopted to exhaust residual gas, so that the dissolved gas in the well water can be completely decompressed and separated by continuously adopting the whole set of well hydrolysis pressure degassing equipment.

3. In order to thoroughly solve the problem of continuous recharging of the sandstone aquifer in equal quantity in deep geothermal development, the inventor considers that various blocking factors are removed only by means of equipment on the ground, the problem of recharging quantity attenuation is still far from being solved, and a more advanced well forming process is needed to be adopted to strive to improve the recharging quantity of a recharging well so as to fully support the initiative of continuous recharging of the well water in equal quantity. At present, all geothermal development enterprises take well and recharge well are all the same, because the equipment which can thoroughly decompress and separate out the gas in the well water can not be used in the past, the dissolved gas in the well water can not be thoroughly decompressed and separated out, the recharge of the well water containing the gas into the ground can cause the gas blockage of an aquifer, and the recharge can only be realized after the flushing well is frequently performed, because the taking well and the recharge well need to be frequently exchanged for pumping and recharging, the taking well and the recharge well can only be designed in the same way. The water taking well is always water taking and the recharging well is always recharging after the same amount of continuous recharging system equipment is adopted, and the water taking well and the recharging well can be designed according to different functional requirements of the water taking well and the recharging well. The deep geothermal development water taking well and recharging well are deeply drilled, the well drilling cost is high, the cost reasons determine that the recharging can not be performed by drilling a plurality of cheap Guan Huiguan wells like a shallow well, and the equal amount of continuous recharging of the taken well water is ensured by means of an advanced well forming process under the condition of pumping and pumping. The inventor researches and practices the well water recharging technology for 30 years, accumulates rich theory and practical experience, adds deep geothermal development well-forming technology in key researches in recent years, accumulates a plurality of design construction skills, considers that the well water recharging technology can fully utilize the favorable condition that the geothermal well is deeply drilled and spans from top to bottom, and greatly makes an article in the aspect of the well-forming technology of the recharging well, and actively adopts the advanced well-forming technology, thereby improving the recharging quantity of the recharging well without increasing or increasing little well-forming cost, and ensuring equal amount of the taken well water to be recharged easily and continuously for a long time. The method has the advantages that an advanced well-forming process is actively adopted to strive to reduce the static water level in the recharging well, improve the natural recharging pressure and increase the recharging quantity, strive to increase the recharging water passing area, reduce the recharging resistance and improve the recharging quantity, strive to reduce the pump lift power consumption of the booster pump and save the operation cost of the water pump, strive to increase the water passing area and improve the heat exchange quantity so as to keep the heat balance of an underground water-bearing layer, the method should become a higher pursuit of geothermal development enterprises, the design of the existing water-taking well and the recharging well is changed as soon as possible, and no design construction skill is known.

4. In order to better understand the purposes of patent disclosure technology declared by the inventor, the method aims at providing geothermal station standardized design construction modes for geothermal development enterprises, helping people to improve thought understanding and discard lagged thought and fuzzy understanding. Because the vacuum negative pressure recharging can be performed in sandstone, the inventor performs serious research and confirmation on the vacuum negative pressure recharging method, namely, an inclined well is drilled, the upper two wellheads are far away, the lower two wellheads are close to each other, and the scheme is the same as a single-well pumping scheme for the upper recharging of water intaking in a shallow underground layer, and a scheme for the induced pumping and recharging of wells, which is used for the funnel area induction recharging of a water intake well, and is a short-flow scheme for recharging. Recharging water is pumped up without long-distance heat exchange through an underground aquifer, long-term stability of water taking temperature cannot be guaranteed, the recharging water belongs to a smart behavior of a machine, and the recharging water has extremely deceptive property. It is also said that the limestone heat storage is easy to recharge, and the vacuum negative pressure recharge can be realized by two pumps and one recharge. The gap in limestone is large, even karst cave is also present, the penetration performance is too good, the recharging water is pumped up without sufficient heat exchange, and the long-term stability of the water taking temperature cannot be ensured. The vacuum negative pressure recharging can suck a large amount of air to pollute the underground water source, the full water micro-pressure recharging is necessary, the vacuum negative pressure recharging is stopped, the geothermal energy is developed and utilized, the energy is saved, the environment is protected, and the water is reserved for offspring. The limestone thermal storage geological conditions can not be solved, and it is not really the case that the limestone is eaten by the day, and in order to make sandstone equivalent continuous recharging, three blocking factors of air blocking, sand blocking and visceral blocking must be thoroughly solved, the advanced well forming process is actively adopted to increase recharging amount, and the initiative of well water recharging is mastered, so that the method can adapt to various hydrogeological conditions to ensure equivalent recharging and long-term continuous recharging of well water.

The inventor discloses a design construction method of a geothermal station equivalent continuous recharging system, and discloses a design, manufacturing, installation and use method of two key devices, namely a vacuum negative pressure unit with a constant temperature cooling water tank and a gas-water separation sand remover with a filter, in order to enable geothermal development enterprises to walk less and bend, and solve the geothermal development well water equivalent continuous recharging problem as soon as possible.

The beneficial effects of this embodiment are:

The method solves the problem that the prior art cannot solve the problem that the sandstone aquifer for the deep geothermal development cannot be continuously recharged in an equivalent amount.

The present invention has been illustrated by the above-described embodiments, but it should be understood that the above-described embodiments are for purposes of illustration and description only and are not intended to limit the invention to the embodiments described. In addition, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications are possible in light of the teachings of the invention, which variations and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

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), characterized in that: A submersible pump (2) is arranged in a closed water intake well (1). 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 layers under the cover of the closed recharging well (17) and at the highest point of the return pipe and all the desander filter barrel equipment. An air suction pipe (7) is installed between the inner and outer pipe layers under the cover of the closed water intake well (1). A vacuum tank connected to a vacuum negative pressure unit (6) with a constant temperature cooling water tank; 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 ), a water diversion pipe (6-18); a system controller (5), a vacuum pump 1 (6-2), a vacuum pump 2 (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 drainage pipe (6-16), a circulation pump (6-17) and a water tank (6-15) are installed on the chassis (6-1); one side of the vacuum tank (6-4) is connected to the closed water intake well (1) through an air intake pipe (7); a check valve (6-5) is provided on the air intake pipe (7). A ball valve (6-6) is connected to an exhaust pipe (6-9) on the other side of the vacuum tank (6-4), and the exhaust pipe (6-9) is connected to the suction 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), and 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 is sleeved on the exhaust hood (6-10) (4), 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 diversion pipe (6-18) are respectively connected to the bottom of the water tank (6-15), and the water diversion 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 air-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 air-water separator (10-3), a top cover (10-4), a barrel body (10-5), a quick-disassembly 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), 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 is welded in the normal direction of the lower barrel wall on the other side of the barrel body (10-5). (10-1), a funnel-shaped upper bracket (10-8) is provided between a water inlet pipe (10-2) and a 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).