Underground drainage water utilization system and control method

Abstract

The invention discloses an underground drainage water utilization system and a control method. The underground drainage water utilization system comprises an underground sump, an earth surface reservoir, an underground pump station, a water source heat pump unit, a water supply pump and a water return pump. The underground sump is used for collecting drainage water gushing from underground fractures. And the underground pump station is communicated with the underground sump and the earth surface reservoir. The water source heat pump unit is provided with a heat pump water inlet, a first water outlet and a second water outlet. The water supply pump communicates with water inlets of the earth surface reservoir and the water source heat pump unit. The water return pump communicates with the first water outlet of the water source heat pump unit and the earth surface reservoir. Under the condition that the water supply pump is started and the second water outlet is closed, heat or cold energy of drainage water in the earth surface reservoir can be repeatedly extracted by the water source heat pump unit for multiple times, the demand for the drainage water amount is low, and the demand for extracting heat or cold energy in a mine with insufficient drainage water amount in an all-weather mode can be met; and energy in the drainage water can be fully utilized, and the environmental protection performance is better.

Description

Technical Field

[0001] This application belongs to the technical field of water supply and drainage, and particularly relates to an underground drainage water utilization system and a control method thereof. Background Art

[0002] During the mining process of underground mining mines, a certain amount of underground drainage water inevitably needs to be discharged from the fissures. The water volume and water temperature of the underground drainage water are relatively stable (about 20 °C). In order to make full use of water resources, the heat or cold in the drainage water is usually extracted through a drainage water utilization system for internal refrigeration or heating in the mine. Compared with heating or refrigeration by electric heating, extracting the heat or cold in the drainage water can save operating costs, especially electricity costs.

[0003] During the preliminary exploration stage of a certain project construction, the operating personnel explored that the water volume of the underground drainage water was abundant and could continuously meet the demand for extracting heat or cold by the 24-hour all-weather drainage water utilization system. However, during the formal construction, it was found that the water volume of the underground drainage water was small. If the traditional drainage water utilization system was used, it could not meet the demand for extracting heat or cold for 24 hours. At this time, if a new well was drilled to supplement water for the water source heat pump, it would violate the national policy of groundwater extraction control; if external water was purchased, not only was it difficult for the external water temperature to meet the requirements, but the cost was also high.

[0004] Therefore, the traditional drainage water utilization system has the technical problems of high demand for the water volume of drainage water and difficulty in being applied to mines with small water volumes. Summary of the Invention

[0005] This application aims to at least solve to a certain extent the technical problem of the high demand for the water volume of drainage water in the traditional drainage water utilization system. For this purpose, this application provides an underground drainage water utilization system and a control method thereof.

[0006] In a first aspect, an underground drainage water utilization system provided by an embodiment of this application includes:

[0007] An underground water sump for collecting the drainage water gushing out from the underground fissures;

[0008] A surface reservoir;

[0009] An underground pumping station connected to the underground water sump and the surface reservoir;

[0010] A water source heat pump unit having a heat pump water inlet, a first water outlet, and a second water outlet;

[0011] A water supply pump connected to the water inlet of the surface reservoir and the water source heat pump unit;

[0012] The return water pump is connected to the first water outlet of the water source heat pump unit and the surface reservoir.

[0013] In some embodiments, the drained water utilization system further includes a second control valve, and the second control valve is installed at the second water outlet.

[0014] In some embodiments, the drained water utilization system further includes a first control valve, and the first control valve is installed at the first water outlet.

[0015] In some embodiments, both the first control valve and the second control valve are automatic control valves, and the underground drained water utilization system further includes:

[0016] A temperature sensor, and the detection end of the temperature sensor is located in the surface reservoir;

[0017] A controller, which is electrically connected to the underground pumping station, the return water pump, the first control valve, the second control valve, and the temperature sensor. The controller controls the opening and closing of the first control valve, the second control valve, the return water pump, and the underground pumping station based on the temperature value detected by the temperature sensor.

[0018] In some embodiments, the drained water utilization system further includes:

[0019] A first liquid level sensor, and the detection end of the first liquid level sensor is located in the surface reservoir;

[0020] A second liquid level sensor, and the detection end of the second liquid level sensor is located in the underground sump;

[0021] The controller is further electrically connected to the first liquid level sensor and the second liquid level sensor. The controller further controls the opening and closing of the second control valve, the first control valve, the return water pump, and the underground pumping station based on the liquid level value detected by the first liquid level sensor and the liquid level value detected by the second liquid level sensor.

[0022] In a second aspect, a control method for an underground drained water utilization system provided by an embodiment of the present application is implemented based on the underground drained water utilization system described in the first aspect. The control method for the underground drained water utilization system includes:

[0023] Obtain the temperature value T0 of the drained water in the surface reservoir, and determine whether the temperature value T0 satisfies the set interval;

[0024] If so, open the second water outlet, and lower the water level of the dewatered water in the surface reservoir from the initial water level value L0 to the set water level value L1; after the water level of the dewatered water in the surface reservoir drops to the set water level value L1, close the second water outlet; open the underground pump station until the water level of the dewatered water in the surface reservoir is equal to the initial water level value L0;

[0025] If not, keep the second water outlet closed until the temperature value T0 satisfies the set range.

[0026] In some embodiments, if the temperature value T0 satisfies the set range, under the condition of opening the second water outlet, close the return water pump and the first water outlet; and under the condition of closing the second water outlet, open the return water pump and the first water outlet.

[0027] In some embodiments, before opening the second water outlet, obtain the water level value L0' of the dewatered water in the underground sump, and set the set water level value L1 based on the water level value L0'.

[0028] In a third aspect, a control method for an underground dewatered water utilization system provided by an embodiment of the present application is implemented based on the underground dewatered water utilization system described in the first aspect. The control method for the underground dewatered water utilization system includes:

[0029] Obtain the temperature value T0 of the dewatered water in the surface reservoir, and determine whether the temperature value T0 satisfies the set range;

[0030] If so, open the second water outlet to lower the water level of the dewatered water in the surface reservoir from the initial water level value L0 to the set water level value L1; after the water level of the dewatered water in the surface reservoir drops to the set water level value L1, close the second water outlet; open the underground pump station until the water level of the dewatered water in the surface reservoir reaches the initial water level value L0;

[0031] If not, obtain the water level value L0' of the dewatered water in the underground sump and determine whether the water level value L0' is greater than or equal to the highest water level value L1';

[0032] If so, open the underground pump station and the second water outlet, and keep the water levels of the underground sump and the surface reservoir stable;

[0033] If not, keep the underground pump station and the second water outlet closed until the water level value L0' of the dewatered water in the underground sump is greater than or equal to the highest water level value L1'; or, keep the second water outlet closed until the temperature value T0 satisfies the set range.

[0034] In some embodiments, after obtaining the liquid level value L0' of the dewatered water in the underground sump, first determine whether the liquid level value L0' is less than or equal to the lowest liquid level value L2'.

[0035] If so, keep the underground pumping station closed;

[0036] If not, determine whether the liquid level value L0' is greater than or equal to the highest liquid level value L1'.

[0037] The present invention has at least the following beneficial effects:

[0038] Under the condition that the water supply pump of the underground dewatered water utilization system of the present application is turned on and the second water outlet is closed, the dewatered water in the surface reservoir can be repeatedly extracted for heat or cold by the water source heat pump unit. It has a relatively low demand for the amount of dewatered water, can meet the demand for extracting heat or cold all day long in mines with insufficient dewatered water volume, and can make full use of the energy in the dewatered water, and has better environmental performance. Under the condition that the water supply pump is turned off and the second water outlet is opened, the dewatered water can be discharged after being extracted once by the water source heat pump unit, meeting the needs of mines with sufficient dewatered water volume, and having a wider range of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0040] Figure 1 Shows a schematic structural diagram of an underground dewatered water utilization system in one or more embodiments of the present application.

[0041] Reference numerals: 100 - underground dewatered water utilization system, 110 - underground sump, 120 - surface reservoir, 130 - underground pumping station, 140 - water source heat pump unit, 140a - water inlet, 140b - first water outlet, 140c - second water outlet, 150 - water supply pump, 160 - return water pump, 165 - first control valve, 170 - second control valve, 175 - temperature sensor, 180 - first liquid level sensor, 185 - second liquid level sensor, 190 - internal circulation pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0043] It should be noted that all the directional indications in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If this specific posture changes, the directional indication will also change accordingly.

[0044] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" can explicitly or implicitly include at least one of these features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] In the traditional solution, after the dewatering water extracts primary cooling or heating capacity through a water source heat pump unit, it is directly discharged. The demand for the amount of dewatering water is relatively high, which is suitable for mines with abundant dewatering water and is difficult to apply in mines with less dewatering water.

[0047] The embodiments of the present application provide an underground dewatering water utilization system and a control method, which can at least solve to a certain extent the technical problem that the traditional dewatering water utilization system has a relatively high demand for the amount of dewatering water.

[0048] Next, the present application will be described in conjunction with the accompanying drawings and with reference to specific embodiments:

[0049] The underground dewatering utilization system 100 includes an underground sump 110, a surface reservoir 120, an underground pumping station 130, a water source heat pump unit 140, a water supply pump 150, and a water return pump 160. The underground sump 110 is used to collect the dewatering water gushing out from underground fissures. The underground pumping station 130 is connected to the underground sump 110 and the surface reservoir 120. The water source heat pump unit 140 has a heat pump water inlet 140a, a first water outlet 140b, and a second water outlet 140c. The water supply pump 150 is connected to the surface reservoir 120 and the water inlet 140a of the water source heat pump unit 140. The water return pump 160 is connected to the first water outlet 140b of the water source heat pump unit 140 and the surface reservoir 120.

[0050] The underground sump 110 is used to aggregate and collect the dewatering water generated by underground fissures. The surface reservoir 120 is used to collect and store the dewatering water transported from the underground sump 110. The surface reservoir 120 can not only provide water for the water source heat pump unit 140, but also provide water for underground production and the ore dressing process. The underground pumping station 130 is connected to the underground sump 110 and the surface reservoir 120 to transmit the dewatering water collected by the underground sump 110 to the surface reservoir 120 for storage through the underground pumping station 130.

[0051] Between the underground pumping station 130 and the underground sump 110, between the underground pumping station 130 and the surface reservoir 120, between the water supply pump 150 and the reservoir 120, between the water supply pump 150 and the water source heat pump unit 140, between the water source heat pump unit 140 and the water return pump 160, and between the water return pump 160 and the surface reservoir 120 can all be connected through pipelines, etc., which are not limited in this application. During the process of transporting the dewatering water in the underground sump 110 to the surface reservoir 120, it is necessary to ensure the stable operation of the drainage system. For this purpose, multiple underground pumping stations 130 can be operated in stages, and the water can be transported to different heights through the main pipeline and the auxiliary pipeline network, etc., to overcome the elevation difference between the mine and the surface.

[0052] The surface reservoir 120 needs to have the function of heat preservation to maintain the water temperature of the dewatering water in the surface reservoir 120. The surface reservoir 120 can achieve the heat preservation function by setting a heat preservation layer on the inner wall, etc., which is not limited in this application. The design of the surface reservoir 120 usually also needs to consider its capacity and location. In terms of capacity, it can be designed to be able to accommodate the total amount of long-term underground dewatering drainage and leave sufficient overflow space to cope with the peak water inflow under extreme weather conditions. In terms of location, the surface reservoir 120 can be close to the mine ore dressing area and the underground water supply system to reduce the water supply transportation distance and save energy and maintenance costs.

[0053] The water source heat pump unit 140 can extract heat or cold from the dewatering water. Its structure is diverse and is well known to those skilled in the art, so it will not be elaborated here.

[0054] The water supply pump 150 is connected to the surface reservoir 120 and the water source heat pump unit 140, and continuously transfers the dewatered water in the surface reservoir 120 to the water source heat pump unit 140, so that the water source heat pump unit 140 can extract the heat or cold in the dewatered water. The heat or cold extracted by the water source heat pump unit 140 can be transferred to the user terminal through the internal circulation pump 190 and the transmission pipeline network for the user to use, so as to meet the heating or cooling needs of the user terminal. It is easy to understand that in winter, the water source heat pump unit 140 can extract the heat in the dewatered water to meet the heating needs of the user, and in summer, the water source heat pump can extract the cold in the dewatered water to meet the cooling needs of the user.

[0055] After the water source heat pump unit 140 treats the dewatered water, the dewatered water is discharged from the first water outlet 140b and the second water outlet 140c of the water source heat pump unit 140. The return water pump 160 is connected to the first water outlet 140b and the surface reservoir 120, so that the dewatered water discharged from the first water outlet 140b can flow back into the surface reservoir 120 and be repeatedly extracted for heat or cold by the water source heat pump unit 140.

[0056] After being designed according to the present application, when the amount of dewatered water is not sufficient, the return water pump 160 can be turned on and the second water outlet 140c can be closed, so that the dewatered water in the surface reservoir 120 is repeatedly extracted for heat or cold by the water source heat pump unit 140, realizing the full utilization of the limited heat or cold in the dewatered water; and after being designed in this way, by adjusting the heat or cold extraction efficiency of the water source heat pump unit 140, the limited heat or cold in the dewatered water can be slowly extracted, so that the water source heat pump unit 140 can operate for 24 hours to meet the requirement of continuously providing cold or heat for the user terminal for 24 hours, meeting the use of mines with insufficient dewatered water.

[0057] After being designed in this way, when the temperature of the dewatered water in the surface reservoir 120 is too high (greater than or equal to the maximum temperature requirement for the dewatered water in the cold extraction working mode of the water source heat pump unit 140) or too low (less than or equal to the minimum temperature requirement for the dewatered water in the heat extraction working mode of the water source heat pump unit 140) after multiple extractions, the return water pump 160 can be closed and the second water outlet 140c can be opened, so that part of the dewatered water in the surface reservoir 120 is discharged. After the discharge, the return water pump 160 is turned on, the second water outlet 140c is closed, and the underground pumping station 130 is turned on, and new dewatered water is replenished into the surface reservoir 120 through the underground pumping station 130 to meet the temperature requirement of the dewatered water for the water source heat pump unit 140, so that the water source heat pump unit 140 can continuously extract heat or cold.

[0058] After such a design, when the dewatering water is sufficient, the return water pump 160 can be closed and the second water outlet 140c can be opened, so that the dewatering water is discharged after being extracted once by the water source heat pump unit 140, meeting the use requirements of mines with sufficient dewatering water.

[0059] In summary, under the condition that the water supply pump 150 is turned on and the second water outlet 140c is closed, the dewatering water in the surface reservoir 120 can be repeatedly extracted for heat or cold by the water source heat pump unit 140. It has a relatively low demand for the amount of dewatering water, can meet the demand for all-weather extraction of heat or cold in mines with insufficient dewatering water, can make full use of the energy in the dewatering water, and has better environmental performance. Under the condition that the water supply pump 150 is turned off and the second water outlet 140c is opened, the dewatering water can be discharged after being extracted once by the water source heat pump unit 140, meeting the requirements of mines with sufficient dewatering water, and has a wider range of application scenarios.

[0060] In some embodiments, the underground dewatering water utilization system 100 further includes a second control valve 170, and the second control valve 170 is installed at the second water outlet 140c. After the second control valve 170 is set, when the second control valve 170 is opened, the second water outlet 140 is opened, and the dewatering water can be discharged externally through the second water outlet 140c. When the second control valve 170 is closed, the second water outlet 140 is closed, and the dewatering water cannot be discharged externally through the second water outlet 140c, which is convenient for the user to control the opening and closing of the second water outlet 140c.

[0061] In some embodiments, the dewatering water utilization system further includes a first control valve 165, and the first control valve 165 is installed at the first water outlet 140b. After the first control valve 165 is set, when the dewatering water needs to flow back into the surface reservoir 120 through the return water pump 160, the first control valve 165 is opened; when the dewatering water does not need to flow back, the first control valve 165 can be closed, which is convenient for the user to control the opening and closing of the first water outlet 140b.

[0062] In some embodiments, both the first control valve 165 and the second control valve 170 are automatic control valves, and the underground dewatering water utilization system 100 further includes a temperature sensor 175 and a controller (not shown in the figure). The detection end of the temperature sensor 175 is located inside the surface reservoir 120. The controller is electrically connected to the underground pumping station 130, the return water pump 160, the first control valve 165, the second control valve 170, and the temperature sensor 175. The controller controls the opening and closing of the first control valve 165, the second control valve 170, the return water pump 160, and the underground pumping station 130 based on the temperature value detected by the temperature sensor 175.

[0063] The detection end of the temperature sensor 175 extends into the dewatered water in the surface reservoir 120 to detect the temperature of the dewatered water in the surface reservoir 120. Since the capacity of the surface reservoir 120 is relatively large, in order to ensure the accuracy of temperature measurement, multiple temperature sensors 175 can be set, and each temperature sensor 175 is respectively set in each area of the surface reservoir 120. The average value of the temperature values measured by the multiple temperature sensors 175 is taken as the final temperature value.

[0064] The automatic control valve can be automatically opened or closed when receiving an opening or closing signal. The automatic control valve can be an electromagnetic valve, a hydraulic control valve, a pneumatic valve, etc., which is not limited in this application. In some embodiments, the automatic control valve is an electromagnetic valve.

[0065] The controller is electrically connected to the underground pumping station 130, the return water pump 160, the first control valve 165, and the second control valve 170 to control the opening and closing of the underground pumping station 130, the return water pump 160, the first control valve 165, and the second control valve 170. The controller is electrically connected to the temperature sensor 175, so that the controller can obtain the temperature value detected by the temperature sensor 175 and control the opening and closing of the underground pumping station 130, the return water pump 160, the first control valve 165, and the second control valve 170 based on the magnitude of the temperature value. After such a design, the underground dewatered water utilization system 100 can be automatically controlled, with a high degree of automation, which helps to save the labor intensity.

[0066] When the water source heat pump unit 140 extracts heat from the dewatered water, the temperature of the dewatered water continuously decreases. When the temperature of the dewatered water drops to the lowest temperature required for the water source heat pump to extract heat, the heat of the dewatered water can no longer be extracted by the water source heat pump unit 140. Therefore, when the water source heat pump unit 140 extracts heat from the dewatered water, a lowest temperature value T1 can be set. When the temperature sensor 175 detects that the temperature value T0 of the dewatered water in the surface reservoir 120 is less than or equal to the lowest temperature value T1, the controller can take corresponding control measures to replace part or all of the dewatered water in the surface reservoir 120, so that the dewatered water in the surface reservoir 120 warms up to meet the temperature requirement of the dewatered water for the water source heat pump unit 140 to extract heat.

[0067] Similarly, when the water source heat pump unit 140 extracts the cooling capacity from the dewatering water, the temperature of the dewatering water continuously rises. When the temperature of the dewatering water rises to the highest temperature required for the water source heat pump to extract the cooling capacity, the cooling capacity of the dewatering water can no longer be extracted by the heat pump unit. Therefore, when the water source heat pump unit 140 extracts the cooling capacity from the dewatering water, a maximum temperature value T2 can be set. When the temperature sensor 175 detects that the temperature value T0 of the dewatering water in the surface reservoir 120 is greater than or equal to the maximum temperature value T2, the controller can take corresponding control measures to replace part or all of the dewatering water in the surface reservoir 120, so that the dewatering water in the surface reservoir 120 is cooled to meet the temperature requirements of the dewatering water when the water source heat pump unit 140 extracts the cooling capacity.

[0068] For the above-mentioned minimum temperature value T1 and maximum temperature value T2, the user can make adaptive settings according to the specific specifications of the water source heat pump unit 140, which are not limited in this application.

[0069] In some embodiments, the controller is configured to: in the working condition where the water source heat pump unit 140 extracts the heat of the dewatering water, when the temperature value T0 detected by the temperature sensor 175 is less than or equal to the set minimum temperature value T1, control the second control valve 170 to open, so that part of the dewatering water in the surface reservoir 120 is discharged. After part of the dewatering water in the surface reservoir 120 is discharged, control the second control valve 170 to close, and then control the underground pumping station 130 to open, so that the water in the underground sump 110 is replenished into the surface reservoir 120, thereby meeting the temperature requirements of the dewatering water when the water source heat pump unit 140 extracts the heat.

[0070] In some embodiments, the controller is configured to: in the working condition where the water source heat pump unit 140 extracts the cooling capacity of the dewatering water, when the temperature value T0 detected by the temperature sensor 175 is greater than or equal to the set maximum temperature value T2, control the second control valve 170 to open, so that part of the dewatering water in the surface reservoir 120 is discharged. After part of the dewatering water in the surface reservoir 120 is discharged, control the second control valve 170 to close, and then control the underground pumping station 130 to open, so that the water in the underground sump 110 is replenished into the surface reservoir 120, thereby meeting the temperature requirements of the dewatering water when the water source heat pump unit 140 extracts the cooling capacity.

[0071] After part of the dewatering water in the surface reservoir 120 is discharged, then control the underground pumping station 130 to open, so that the discharge of the dewatering water in the surface reservoir 120 and the replenishment of the dewatering water in the surface reservoir 120 are carried out separately, ensuring that the discharged dewatering water is the dewatering water with the temperature reaching the maximum temperature value T2 and the minimum temperature value T1, rather than the newly replenished dewatering water from the underground sump 110, which helps to reduce energy waste.

[0072] In some embodiments, the controller is further configured to: when controlling the second control valve 170 to open, synchronously control the return water pump 160 and the first control valve 165 to close, so that all the water discharged from the water source heat pump unit 140 is discharged through the second water outlet 140c, improving the efficiency of the discharged water.

[0073] In some embodiments, the underground dewatering water utilization system 100 further includes: a first liquid level sensor 180 and a second liquid level sensor 185. The detection end of the first liquid level sensor 180 is located in the surface reservoir 120; the detection end of the second liquid level sensor 185 is located in the underground sump 110. The controller is also electrically connected to the first liquid level sensor 180 and the second liquid level sensor 185, and the controller also controls the opening and closing of the second control valve 170, the first control valve 165, the return water pump 160, and the underground pumping station 130 based on the liquid level value detected by the first liquid level sensor 180 and the liquid level value detected by the second liquid level sensor 185.

[0074] The detection ends of the first liquid level sensor 180 and the second liquid level sensor 185 are respectively located in the surface reservoir 120 and the underground sump 110 to respectively detect the liquid levels of the surface reservoir 120 and the underground sump 110. After obtaining the liquid levels of the surface reservoir 120 and the underground sump 110, the volumes of the dewatered water in the surface reservoir 120 and the underground sump 110 can be calculated. For example, if the surface reservoir 120 and the underground sump 110 are cylindrical, the volume of the dewatered water in the surface reservoir 120 can be calculated by multiplying the bottom area of the surface reservoir 120 by the liquid level height detected by the first liquid level sensor 180, and the volume of the dewatered water in the underground sump 110 can be calculated by multiplying the bottom area of the underground sump 110 by the liquid level height detected by the second liquid level sensor 185. The calculation methods are diverse and will not be elaborated in this application.

[0075] The controller is electrically connected to both the first liquid level sensor 180 and the second liquid level sensor 185, enabling the controller to obtain the liquid level values detected by the first liquid level sensor 180 and the second liquid level sensor 185, and to control the opening and closing of the underground pumping station 130, the return water pump 160, the first control valve 165, and the second control valve 170 based on the liquid level values. After such a design, the underground dewatering water utilization system 100 can be automatically controlled with a high degree of automation, which helps to save the labor intensity of workers.

[0076] In some embodiments, the controller is configured to keep the underground pumping station 130 closed when the liquid level value L0' detected by the second liquid level sensor 185 is less than or equal to the set minimum liquid level value L2'. When the liquid level in the underground sump 110 is less than or equal to the minimum liquid level value L2', it indicates that the dewatering water in the underground sump 110 has been emptied or the amount of dewatering water cannot be pumped by the underground pumping station 130. At this time, if the underground pumping station 130 is started, the underground pumping station 130 will run idly and is extremely likely to be damaged. After such a design, the underground pumping station 130 can be protected, which helps to extend the service life of the underground pumping station 130 and avoid damage caused by dry running of the underground pumping station.

[0077] In some embodiments, the controller is configured to control the underground pumping station 130 to start after the dewatering water in the surface reservoir 120 is discharged through the second water outlet 140c, so that the dewatering water in the underground sump 110 is replenished into the surface reservoir 120 until the liquid level value of the second liquid level sensor 185 is equal to the initial liquid level value before the discharge. After such a setting, the amount of water discharged from the surface reservoir 120 is the same as the amount of water replenished by the underground sump 110, thus ensuring that the water level of the surface reservoir 120 remains stable and will not decrease due to the discharge, which helps to ensure the continuous and stable operation of the underground dewatering water utilization system 100.

[0078] In some embodiments, the controller is configured to, under the condition that the water source heat pump unit 140 extracts the heat of the dewatering water, when the temperature value detected by the temperature sensor 175 is less than or equal to the set minimum temperature value T1, control the second control valve 170 to open, the first control valve 165 to close, and the return water pump 160 to close, so that the liquid level of the dewatering water in the surface reservoir 120 drops from the initial liquid level value L0 to the set liquid level value L1. After the liquid level of the dewatering water in the surface reservoir 120 drops to the set liquid level value L1, control the second control valve 170 to close, control the first control valve 165 to open, and the return water pump 160 to open, and then control the underground pumping station 130 to open, so that the water in the underground sump 110 is replenished into the surface reservoir 120 until the liquid level of the dewatering water in the surface reservoir 120 reaches the initial liquid level value L0. It should be noted that during this process, the water supply pump 150 and the water source heat pump unit 140 are always in operation. In this way, due to the discharge of part of the dewatering water with a lower temperature in the surface reservoir 120 and the replenishment of the dewatering water with a higher temperature in the underground sump 110 into the surface reservoir 120, after the replenishment is completed, the temperature of the dewatering water in the surface reservoir 120 will rise to be greater than the minimum temperature value T1, enabling the water source heat pump unit 140 to continuously extract the heat of the dewatering water and avoiding interruption.

[0079] In some embodiments, the controller is configured to: under the condition that the water source heat pump unit 140 extracts the cooling capacity of the dewatering water, when the temperature value detected by the temperature sensor 175 is greater than or equal to the set maximum temperature, control the second control valve 170 to open, the first control valve 165 to close, and the return water pump 160 to close, so that the liquid level of the dewatering water in the surface reservoir 120 drops from the initial liquid level value L0 to the set liquid level value L1. After the liquid level of the dewatering water in the surface reservoir 120 drops to the set liquid level value L1, control the second control valve 170 to close, control the first control valve 165 to open, and the return water pump 160 to open, and then control the underground pumping station 130 to open, so that the water in the underground sump 110 is replenished into the surface reservoir 120 until the liquid level of the dewatering water in the surface reservoir 120 reaches the initial liquid level value L0. It should be noted that during this process, the water supply pump 150 and the water source heat pump unit 140 are always in operation. In this way, due to the discharge of part of the dewatering water with a higher temperature in the surface reservoir 120 and the replenishment of the dewatering water with a lower temperature in the underground sump 110 into the surface reservoir 120, after the replenishment is completed, the temperature of the dewatering water in the surface reservoir 120 will be reduced to less than the maximum temperature value T2, enabling the water source heat pump unit 140 to continuously extract the cooling capacity of the dewatering water and avoiding interruption.

[0080] It should be noted that the liquid level value needs to ensure the water volume requirement of the water source heat pump unit 140. That is, when the liquid level of the dewatering water in the surface reservoir 120 drops to the liquid level value L1, the water supply pump 150 and the water source heat pump unit 140 can still operate normally. The liquid level of the dewatering water in the surface reservoir 120 is dropped to the liquid level value L1 instead of completely emptying the surface reservoir 120 to ensure the continuous and uninterrupted operation of the water supply pump 150 and the water source heat pump unit 140, so as to meet the demand for extracting heat or cooling capacity at the user end 24 hours a day.

[0081] In some embodiments, the controller is configured to: when the liquid level value L0' detected by the second liquid level sensor 185 is greater than or equal to the maximum liquid level value L1', control the underground pumping station 130 to open, control the second control valve 170 to open, and adjust the power of the underground pumping station 130 and the opening degree of the second control valve 170 so that the liquid levels of the first liquid level sensor 180 and the second liquid level sensor 185 remain unchanged.

[0082] When the level of the drained water in the underground sump 110 reaches L0' which is greater than or equal to the highest level value L1', there is a risk that the drained water will overflow from the underground sump 110, causing waste of water resources. At this time, the underground pumping station 130 and the second control valve 170 are opened, so that the underground pumping station 130 pumps the drained water in the underground sump 110 and sends it into the surface reservoir 120. At the same time, the drained water in the surface reservoir 120 is discharged through the second water outlet 140c. After such a design, the drained water that is about to overflow in the underground sump 110 is replenished into the surface reservoir 120 to reduce or increase the temperature of the drained water in the surface reservoir 120, which will help to make full use of the energy in the drained water. No matter how much new water gushes out from the underground fissures into the underground sump 110, the underground pumping station 130 pumps the same amount of water into the surface reservoir 120 to maintain the water level in the underground sump 110 stable at the highest level value L1'. The surface reservoir 120 discharges the same amount of drained water through the second water outlet 140c where the second regulating valve 170 is located to maintain the stable level of the surface reservoir 120.

[0083] Based on the same inventive concept, the embodiment of the present application further provides a control method for an underground drained water utilization system, which is implemented based on the above-mentioned underground drained water utilization system 100. The control method for the underground drained water utilization system includes:

[0084] S100, obtain the temperature value T0 of the drained water in the surface reservoir 120, and determine whether the temperature value T0 satisfies the set interval.

[0085] When the water source heat pump unit 140 extracts the cold energy from the drained water, when the temperature value T0 is greater than or equal to the set highest temperature value T2, the temperature value T0 satisfies the set interval. Similarly, when the water source heat pump unit 140 extracts the heat energy from the drained water, when the temperature value T0 is less than or equal to the set lowest temperature value T1, the temperature value T0 satisfies the set interval.

[0086] S200, if so, open the second water outlet 140c, and lower the level of the drained water in the surface reservoir 120 from the initial level value L0 to the set level value L1; after the level of the drained water in the surface reservoir 120 drops to the set level value L1, close the second water outlet 140c; open the underground pumping station 130 until the level of the drained water in the surface reservoir 120 is equal to the initial level value L0.

[0087] If the temperature value T0 satisfies the set range, it indicates that the temperature of the drained water in the surface reservoir 120 will soon not meet the requirements of the water source heat pump unit 140 for the temperature of the drained water. At this time, the second water outlet 140c is first opened, so that part of the drained water in the surface reservoir 120 is discharged through the second water outlet 140c. As the drained water is discharged, the liquid level of the drained water in the surface reservoir 120 drops. When the liquid level of the drained water in the surface reservoir 120 drops to reach the set liquid level value L1, that is, after discharging a set volume of drained water, the second water outlet 140c is closed to terminate the external discharge of the drained water. After closing the second water outlet 140c, the underground pumping station 130 is then opened, and the underground pumping station 130 replenishes the drained water in the underground sump 110 into the surface reservoir 120, thereby adjusting the temperature of the drained water in the surface reservoir 120, enabling the water source heat pump unit 140 to continuously extract the heat of the drained water or heat, and avoiding the occurrence of interruption. Specifically, when the water source heat pump unit 140 extracts the cold in the drained water, the newly replenished drained water will cause the overall temperature of the drained water in the surface reservoir 120 to drop; when the water source heat pump unit 140 extracts the heat in the drained water, the newly replenished drained water will cause the overall temperature of the drained water in the surface reservoir 120 to rise.

[0088] Open the underground pumping station 130 until the liquid level of the drained water in the surface reservoir 120 is equal to the initial liquid level value L0, so that the amount of drained water discharged from the surface reservoir 120 is the same as the amount of water replenished to it by the underground sump 110, thereby ensuring that the water level of the surface reservoir 120 remains stable and will not decrease due to external discharge, which helps to ensure the continuous and stable operation of the underground drained water utilization system 100.

[0089] S300, if not, then keep the second water outlet 140c closed until the temperature value T0 satisfies the set range.

[0090] If the temperature value T0 does not satisfy the set range, it indicates that the water temperature of the drained water in the surface reservoir 120 can still meet the requirements of the water source heat pump unit 140 for the temperature. Then keep the second water outlet 140c closed until the temperature value T0 satisfies the set range.

[0091] In some embodiments, if the temperature value T0 satisfies the set range, under the condition of opening the second water outlet 140c, the return water pump 160 and the first water outlet 140b are closed; and under the condition of closing the second water outlet 140c, the return water pump 160 and the first water outlet 140b are opened.

[0092] That is to say, if the temperature value T0 satisfies the set range, while opening the second water outlet 140c, the return water pump 160 and the first water outlet 140b should also be closed, so that all the dewatered water discharged from the water source heat pump unit 140 is discharged through the second water outlet 140c, improving the efficiency of external drainage; after the liquid level of the dewatered water in the surface reservoir 120 drops to the set liquid level value L1, while closing the second water outlet 140c, the return water pump 160 and the first water outlet 140b should also be opened to ensure that the dewatered water discharged from the water source heat pump unit 140 flows back into the surface reservoir 120.

[0093] In some embodiments, before opening the second water outlet 140c, the liquid level value L0' of the dewatered water in the underground sump 110 is obtained, and the set liquid level value L1 is set based on the liquid level value L0'. That is to say, if the temperature value T0 satisfies the set range, first obtain the dewatered liquid level value L0' in the underground sump 110, set the set liquid level value L1 based on the liquid level value L0', and then open the second water outlet 140c to make the liquid level value of the dewatered water in the surface reservoir 120 drop to the set liquid level value L1.

[0094] Specifically, after obtaining the liquid level value L0' of the dewatered water in the underground sump 110, calculate the amount of dewatered water in the underground sump 110, and set the external drainage volume of the surface reservoir 120 to be less than the amount of dewatered water in the underground sump 110, so as to obtain the set liquid level value L1, to prevent the external drainage volume of the surface reservoir 120 from being greater than the amount of dewatered water in the underground sump 110, resulting in the situation that the underground sump 110 cannot replenish the surface reservoir 120.

[0095] Based on the same inventive concept, the embodiment of the present application also provides a control method for an underground dewatered water utilization system, which is implemented based on the above-mentioned underground dewatered water utilization system 100. The control method for the underground dewatered water utilization system includes:

[0096] S10, obtain the temperature value T0 of the dewatered water in the surface reservoir 120, and judge whether the temperature value T0 satisfies the set range.

[0097] When the water source heat pump unit 140 extracts the cold energy in the dewatered water, when the temperature value T0 is greater than or equal to the set highest temperature value T2, the temperature value T0 satisfies the set range. Similarly, when the water source heat pump unit 140 extracts the heat in the dewatered water, when the temperature value T0 is less than or equal to the set lowest temperature value T1, the temperature value T0 satisfies the set range.

[0098] S20, if so, open the second water outlet 140c, and lower the water level of the drained water in the surface reservoir 120 from the initial water level value L0 to the set water level value L1; after the water level of the drained water in the surface reservoir 120 drops to the set water level value L1, close the second water outlet 140c; turn on the underground pumping station 130 until the water level of the drained water in the surface reservoir 120 reaches the initial water level value L0.

[0099] If the temperature value T0 meets the set range, it indicates that the temperature of the drained water in the surface reservoir 120 will soon not meet the requirements of the water source heat pump unit 140 for the temperature of the drained water. At this time, first open the second water outlet 140c, so that part of the drained water in the surface reservoir 120 is discharged through the second water outlet 140c. As the drained water is discharged, the water level of the drained water in the surface reservoir 120 drops. After the water level of the drained water in the surface reservoir 120 drops to the set water level value L1, that is, after discharging a set volume of drained water, close the second water outlet 140c to terminate the external discharge of the drained water. After closing the second water outlet 140c, then turn on the underground pumping station 130. The underground pumping station 130 replenishes the drained water in the underground sump 110 into the surface reservoir 120, thereby adjusting the temperature of the drained water in the surface reservoir 120, enabling the water source heat pump unit 140 to continuously extract the heat of the drained water or heat, and avoiding interruption. Specifically, when the water source heat pump unit 140 extracts the cold in the drained water, the newly replenished drained water will cause the overall temperature of the drained water in the surface reservoir 120 to drop; when the water source heat pump unit 140 extracts the heat in the drained water, the newly replenished drained water will cause the overall temperature of the drained water in the surface reservoir 120 to rise.

[0100] Turn on the underground pumping station 130 until the water level of the drained water in the surface reservoir 120 is equal to the initial water level value L0, so that the amount of water discharged from the surface reservoir 120 is the same as the amount of water replenished by the underground sump 110, thereby ensuring that the water level of the surface reservoir 120 remains stable and will not decrease due to external discharge, which helps to ensure the continuous and stable operation of the underground drained water utilization system 100.

[0101] S30, if not, obtain the water level value L0' of the drained water in the underground sump 110.

[0102] If the temperature value T0 does not meet the set range, it indicates that the water temperature of the drained water in the surface reservoir 120 can still meet the requirements of the water source heat pump unit 140 for the temperature. At this time, obtain the water level value L0' of the drained water in the underground sump 110.

[0103] S40, determine whether the water level value L0' is less than or equal to the lowest water level value L2'.

[0104] S50, if so, keep the underground pumping station 130 closed.

[0105] When the liquid level in the underground sump 110 is less than or equal to the lowest liquid level value L2', it indicates that the drained water in the underground sump 110 has been emptied or the amount of drained water cannot be pumped by the underground pump station 130. At this time, if the underground pump station 130 is started, the underground pump station 130 will run idly and is extremely likely to be damaged. After such a design, the underground pump station 130 can be protected, which helps to extend the service life of the underground pump station 130 and avoid damage caused by dry running of the underground pump station.

[0106] S60, if not, then judge whether the liquid level value L0' is greater than or equal to the highest liquid level value L1'.

[0107] S70, if so, then start the underground pump station 130 and the second water outlet 140c, and keep the liquid levels of the underground sump 110 and the surface reservoir 120 stable.

[0108] If the liquid level of the drained water in the underground sump 110 to L0' is greater than or equal to the highest liquid level value L1', there is a risk that the drained water will overflow from the underground sump 110, causing waste of water resources. At this time, the underground pump station 130 and the second water outlet 140c are started, so that the underground pump station 130 pumps the drained water in the underground sump 110 and sends it into the surface reservoir 120, and at the same time, the drained water in the surface reservoir 120 is discharged through the second water outlet 140c. After such a design, the drained water that is about to overflow in the underground sump 110 is replenished into the surface reservoir 120 to reduce or increase the temperature of the drained water in the surface reservoir 120, which will help to make the energy in the drained water be fully utilized. No matter how much new water gushes out from the underground fissures into the underground sump 110, the underground pump station 130 pumps the same amount of water into the surface reservoir 120 to maintain the water level in the underground sump 110 stable at the highest liquid level value L1'. No matter how much drained water is replenished into the surface reservoir 120 through the underground pump station 130, the same amount of drained water is discharged through the second water outlet 140c where the second regulating valve 170 is located to maintain the liquid level of the surface reservoir 120 stable.

[0109] S80, if not, then keep the underground pump station 130 and the second water outlet 140c closed until the liquid level value L0' of the drained water in the underground sump 110 is greater than or equal to the highest liquid level value L1'; or, keep the second water outlet 140c closed until the temperature value T0 meets the set range.

[0110] If the level value L0’ of the dewatered water in the underground sump 110 is less than the highest level value L1’, there is no risk that the dewatered water in the underground sump 110 overflows outside the underground sump 110. At this time, the underground pumping station 130 and the second water outlet 140c can be continuously closed until the level value L0’ of the dewatered water in the underground sump 110 is greater than or equal to the highest level value L1’; or, the second water outlet 140c can be closed until the temperature value T0 satisfies the set range. When the level value L0’ of the dewatered water in the underground sump 110 is greater than or equal to the highest level value L1’, the above step S70 is performed. When the temperature value T0 satisfies the set range, the above step S20 is performed.

[0111] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0112] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0113] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. An underground drainage water utilization system, characterized in that Comprising: An underground sump (110) for collecting the dewatering water gushing out from underground fissures; A surface reservoir (120); An underground pumping station (130) connected to the underground sump (110) and the surface reservoir (120); A water source heat pump unit (140) having a heat pump water inlet (140a), a first water outlet (140b), and a second water outlet (140c); A water supply pump (150) connected to the surface reservoir (120) and the water inlet (140a) of the water source heat pump unit (140); A water return pump (160) connected to the first water outlet (140b) of the water source heat pump unit (140) and the surface reservoir (120).

2. The underground drainage water utilization system according to claim 1, characterized in that, The dewatering water utilization system further includes a second control valve (170), and the second control valve (170) is installed at the second water outlet (140c).

3. The underground drainage water utilization system according to claim 2, characterized in that, The dewatering water utilization system further includes a first control valve (165), and the first control valve (165) is installed at the first water outlet (140b).

4. The underground dewatering water utilization system according to claim 3, characterized in that, Both the first control valve (165) and the second control valve (170) are automatic control valves, and the underground dewatering water utilization system (100) further includes: A temperature sensor (175), and the detection end of the temperature sensor (175) is located inside the surface reservoir (120); A controller electrically connected to the underground pumping station (130), the water return pump (160), the first control valve (165), the second control valve (170), and the temperature sensor (175). The controller controls the opening and closing of the first control valve (165), the second control valve (170), the water return pump (160), and the underground pumping station (130) based on the temperature value detected by the temperature sensor (175).

5. The underground dewatering water utilization system according to claim 4, characterized in that, The dewatering water utilization system further includes: A first liquid level sensor (180), and the detection end of the first liquid level sensor (180) is located inside the surface reservoir (120); A second liquid level sensor (185), and the detection end of the second liquid level sensor (185) is located inside the underground sump (110); The controller is also electrically connected to the first liquid level sensor (180) and the second liquid level sensor (185). The controller also controls the opening and closing of the second control valve (170), the first control valve (165), the water return pump (160), and the underground pumping station (130) based on the liquid level value detected by the first liquid level sensor (180) and the liquid level value detected by the second liquid level sensor (185).

6. A control method for an underground drainage water utilization system, characterized in that, Implemented based on the underground dewatering water utilization system (100) according to any one of claims 1-5, the control method of the underground dewatering water utilization system includes: Obtaining the temperature value T0 of the dewatering water in the surface reservoir (120), and determining whether the temperature value T0 satisfies a set interval; If so, open the second water outlet (140c), and lower the water level of the dewatered water in the surface reservoir (120) from the initial water level value L0 to the set water level value L1; after the water level of the dewatered water in the surface reservoir (120) drops to the set water level value L1, close the second water outlet (140c); open the underground pump station (130) until the water level of the dewatered water in the surface reservoir (120) is equal to the initial water level value L0; If not, keep the second water outlet (140c) closed until the temperature value T0 meets the set range.

7. The control method of the underground drainage water utilization system according to claim 6, characterized in that, If the temperature value T0 meets the set range, under the condition of opening the second water outlet (140c), close the water return pump (160) and the first water outlet (140b); and under the condition of closing the second water outlet (140c), open the water return pump (160) and the first water outlet (140b).

8. The control method of the underground drainage water utilization system according to claim 6, characterized in that, Before opening the second water outlet (140c), obtain the water level value L0' of the dewatered water in the underground sump (110), and set the set water level value L1 based on the water level value L0'.

9. A control method for an underground drainage water utilization system, characterized in that, Implemented based on the underground dewatered water utilization system (100) according to any one of claims 1-5, the control method of the underground dewatered water utilization system includes: Obtain the temperature value T0 of the dewatered water in the surface reservoir (120), and determine whether the temperature value T0 meets the set range; If so, open the second water outlet (140c) to lower the water level of the dewatered water in the surface reservoir (120) from the initial water level value L0 to the set water level value L1; after the water level of the dewatered water in the surface reservoir (120) drops to the set water level value L1, close the second water outlet (140c); open the underground pump station (130) until the water level of the dewatered water in the surface reservoir (120) reaches the initial water level value L0; If not, obtain the water level value L0' of the dewatered water in the underground sump (110) and determine whether the water level value L0' is greater than or equal to the highest water level value L1'; If so, open the underground pump station (130) and the second water outlet (140c), and keep the water levels of the underground sump (110) and the surface reservoir (120) stable; If not, keep the underground pump station (130) and the second water outlet (140c) closed until the water level value L0' of the dewatered water in the underground sump (110) is greater than or equal to the highest water level value L1'; or, keep the second water outlet (140c) closed until the temperature value T0 meets the set range.

10. The control method of an underground drainage water utilization system according to claim 9, characterized in that, After obtaining the water level value L0' of the dewatered water in the underground sump (110), first determine whether the water level value L0' is less than or equal to the lowest water level value L2'; If so, keep the underground pump station (130) closed; If not, determine whether the water level value L0' is greater than or equal to the highest water level value L1'.

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