Mixed water utilization system and method for deep reservoir water of hydropower station and return cooling water of air conditioner

Abstract

According to the mixed water utilization system and method for the deep reservoir water and the return cooling water of the air conditioner of the hydropower station, the deep reservoir water is collected to the constant-temperature water mixing valve through the deep reservoir water taking subsystem, and the return cooling water is collected to the constant-temperature water mixing valve through the return water subsystem and the branch pipe return water subsystem; the deep reservoir water and the cooling water return water are mixed in the constant-temperature water mixing valve, then the mixed water is conveyed into the water chilling unit through the cooling water inlet pipe, the deep reservoir water and the cooling water return water are jointly utilized, and it is ensured that the temperature of water entering the water chilling unit can meet normal operation of the water chilling unit. Through combined utilization of the deep reservoir water and the cooling water return water, the problem that the air conditioner cooling water temperature is unstable or too low due to the fact that the deep reservoir water is directly applied to a ventilation air conditioner system of a hydropower station is solved, the cooling water inlet temperature of a water chilling unit can be controlled, the construction cost is reduced, the utilization efficiency of the deep reservoir water is improved, and the economic benefit is increased. And the efficiency of the water chilling unit is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power engineering and relates to a system and method for utilizing mixed water. Background Art

[0002] With the development of society and economy, the number of large hydropower stations with a capacity of more than one million kilowatts has gradually increased. However, due to environmental restrictions and the need for power station hubs, the main powerhouses of most large hydropower stations are arranged underground. In order to ensure the normal operation of equipment and normal activities of personnel in the underground powerhouse of the hydropower station, it is necessary to control the working environment in the underground powerhouse through a ventilation and air-conditioning system. However, due to the large heat load generated by the underground powerhouse environment and equipment, the use of artificial cold sources consumes a lot of energy, the cost is too high, and it is not conducive to energy conservation and environmental protection. The use of natural cold sources has huge energy-saving potential. In hydropower stations, deep reservoir water is a huge natural resource with great thermal inertia and small temperature fluctuations. It is an ideal natural cold source. However, due to the different environments of various hydropower stations, the layout of underground powerhouses and installed capacities, the forms of ventilation and air conditioning, the water temperature of the water intake, and the use of deep reservoir water as a cold source are also different. At present, there are generally two forms of deep reservoir water as a cold source in the ventilation and air-conditioning system of the underground powerhouse of domestic hydropower stations-the cold source of the combined air-conditioning unit and the cooling water of the chiller. However, the temperature of deep reservoir water is mainly related to its depth. The water temperature varies with depth. At the same time, according to seasonal changes, the water depth of the same water intake is different in different seasons, so the water temperature taken from the water intake in different seasons also fluctuates. If deep reservoir water is directly used in ventilation and air-conditioning systems, the cooling water temperature of the ventilation and air-conditioning system will be unstable or too low, which will cause the high and low pressure difference of the compression refrigeration system to be insufficient, unstable operation, and poor operation of the lubrication system. In severe cases, accidents will occur in the ventilation and air-conditioning system. Summary of the invention

[0003] In order to solve the problem of unstable or too low air conditioning cooling water temperature caused by direct application of deep reservoir water in the ventilation and air conditioning system of a hydropower station as described in the background technology, the present invention provides a mixed water utilization system and method for deep reservoir water in a hydropower station and air conditioning cooling water return water.

[0004] The present invention proposes a mixed water utilization system for deep reservoir water and air conditioning cooling water return water of a hydropower station, comprising a branch pipe return water subsystem, a deep reservoir water intake subsystem, a constant temperature mixing water valve, a chiller and a return water subsystem; the branch pipe return water subsystem comprises a return water branch pipe, the water outlet of the return water branch pipe is connected to the constant temperature mixing water valve, and the water inlet of the return water branch pipe is connected to the return water subsystem; the water inlet of the deep reservoir water intake subsystem is connected to the deep reservoir water intake, and the water outlet is connected to the constant temperature mixing water valve; the chiller is provided with a cooling water inlet pipe, and the cooling water inlet pipe is connected to the The outlet of the thermostatic mixing valve is connected; the return water subsystem includes a return water main, a drain pipe and a three-way valve; the outlet of the return water main, the water inlet of the drain pipe and the water inlet of the return water branch pipe are connected through a three-way valve; the water inlet of the return water main is connected to the cooling water return of the chiller; the outlet of the drain pipe is connected to the tail water; the thermostatic mixing valve controls the water temperature of the outlet by adjusting the valve opening of the cooling water return water inlet and the valve opening of the deep reservoir water inlet, and the outlet of the thermostatic mixing valve is connected to the cooling water inlet pipe of the chiller.

[0005] Furthermore, the branch pipe return water subsystem also includes a return water frequency conversion pump, a branch pipe return water filter, a branch pipe return water pressure controller, a branch pipe return water temperature controller, a branch pipe return water flow meter and a return water check valve; the return water frequency conversion pump, the branch pipe return water filter, the branch pipe return water pressure controller, the branch pipe return water temperature controller, the branch pipe return water flow meter and the return water check valve are all installed on the return water branch pipe; the branch pipe return water filter is arranged between the three-way valve and the return water frequency conversion pump; the branch pipe return water pressure controller is arranged at the water outlet end of the return water frequency conversion pump and is electrically connected to the return water frequency conversion pump, for controlling the water flow rate of the return water branch pipe; the branch pipe return water temperature controller and the branch pipe return water flow meter are both arranged at the water outlet end of the branch pipe return water pressure controller; the return water check valve is arranged on the side close to the constant temperature mixing valve.

[0006] Furthermore, the deep reservoir water intake subsystem includes a deep reservoir water intake pipe, a water intake frequency conversion pump, a reservoir water filter, a water intake temperature controller, a water intake pressure controller, a water intake check valve and a water intake flow meter; the deep reservoir water intake pipe connects the deep reservoir water intake port and the constant temperature mixing valve; the water intake frequency conversion pump, reservoir water filter, water intake temperature controller, water intake pressure controller, water intake check valve and water intake flow meter are all installed on the deep reservoir water intake pipe; the reservoir water filter is arranged between the deep reservoir water intake port and the water intake frequency conversion pump; the water intake temperature controller and the water intake pressure controller are both arranged at the water outlet end of the water intake frequency conversion pump, and the water intake pressure controller is electrically connected to the water intake frequency conversion pump for controlling the water flow rate of the deep reservoir water intake pipe; the water intake check valve and the water intake flow meter are arranged on the side close to the constant temperature mixing valve.

[0007] Furthermore, the thermostatic mixing valve includes a hot water inlet of the thermostatic mixing valve, a cold water inlet of the thermostatic mixing valve and a water outlet of the thermostatic mixing valve; the hot water inlet of the thermostatic mixing valve, the cold water inlet of the thermostatic mixing valve and the water outlet of the thermostatic mixing valve are all provided with temperature controllers, and the temperature controller is electrically connected to the thermostatic mixing valve for controlling the opening and closing degree of the cold and hot water inlets; the hot water inlet of the thermostatic mixing valve is connected to the outlet of the return branch pipe; the cold water inlet of the thermostatic mixing valve is connected to the outlet of the deep reservoir water intake pipe; the water outlet of the thermostatic mixing valve is connected to the chiller.

[0008] Furthermore, a cooling water inlet electric differential pressure valve, an electric heater, a cooling water temperature controller, a cooling water pressure controller and a cooling water inlet flow meter are installed on the cooling water inlet pipe of the chiller; the water inlet of the cooling water inlet pipe is connected to the water outlet of the constant temperature mixing valve; the cooling water temperature controller and the cooling water pressure controller are arranged between the water outlet of the constant temperature mixing valve and the cooling water inlet electric differential pressure valve; the cooling water inlet flow meter is arranged at the water outlet end of the cooling water inlet electric differential pressure valve; and the electric heater is arranged at the water outlet end of the cooling water inlet flow meter.

[0009] Furthermore, a cooling water return electric pressure differential valve and a return flow meter are installed on the return water main of the return water subsystem; the cooling water return electric pressure differential valve is arranged on a side close to the chiller, and the return flow meter is arranged at the water outlet end of the cooling water return electric pressure differential valve.

[0010] The present invention also proposes a mixed water utilization method of deep reservoir water of a hydropower station and air conditioning cooling water return water, comprising:

[0011] The cooling water return of the chiller is discharged through the return pipe of the return subsystem. The outlet of the return pipe is connected to the inlet of the drain pipe and the inlet of the return branch pipe of the branch return subsystem through a three-way valve. A part of the cooling water return is discharged to the tail water discharge through the drain pipe, and the other part of the cooling water return is discharged into the return branch pipe of the branch return subsystem.

[0012] The water outlet of the return branch pipe of the branch pipe return subsystem is connected to the thermostatic mixing valve;

[0013] The water inlet of the deep reservoir water intake subsystem is connected to the deep reservoir water intake, and the water outlet of the deep reservoir water intake subsystem is connected to the thermostatic mixing valve;

[0014] The thermostatic mixing valve controls the water temperature at the outlet by adjusting the valve opening of the cooling water return inlet and the valve opening of the deep reservoir water inlet. The outlet of the thermostatic mixing valve is connected to the cooling water inlet pipe of the chiller.

[0015] Furthermore, the return water main pipe controls the flow rate of cooling water return water through the cooling water return water electric pressure differential valve; the return water main pipe detects the flow rate of cooling water return water through the return water flow meter;

[0016] The return water branch pipe filters impurities in the cooling water return water through the branch pipe return water filter, and the filtered cooling water return water flows into the return water variable frequency pump, and the return water variable frequency pump pumps the filtered cooling water return water to the constant temperature mixing valve; the return water branch pipe controls the flow rate of the filtered cooling water return water through the branch pipe return water pressure controller, detects the flow rate of the filtered cooling water return water through the branch pipe return water flowmeter, detects the temperature of the filtered cooling water return water through the branch pipe return water temperature controller, and prevents the filtered cooling water return water from flowing back into the constant temperature mixing valve through the return water check valve;

[0017] The deep reservoir water intake subsystem connects the deep reservoir water intake port and the thermostatic mixing valve through a deep reservoir water intake pipe; the deep reservoir water intake pipe filters impurities in the deep reservoir water through a reservoir water filter, and the filtered deep reservoir water flows into the water intake variable frequency pump, and the water intake variable frequency pump pumps the filtered deep reservoir water to the thermostatic mixing valve; the deep reservoir water intake pipe controls the flow of the filtered deep reservoir water through a water intake pressure controller, detects the flow of the filtered deep reservoir water through a water intake flowmeter, detects the temperature of the filtered deep reservoir water through a water intake temperature controller, and prevents the filtered deep reservoir water from flowing back into the thermostatic mixing valve through a water intake check valve;

[0018] The thermostatic mixing valve inputs cooling water return water through the hot water inlet of the thermostatic mixing valve, inputs deep reservoir water through the cold water inlet of the thermostatic mixing valve, and outputs mixed water of cooling water return water and deep reservoir water through the outlet of the thermostatic mixing valve; the hot water inlet of the thermostatic mixing valve, the cold water inlet of the thermostatic mixing valve and the outlet of the thermostatic mixing valve control the opening and closing degree of the hot water inlet of the thermostatic mixing valve and the cold water inlet of the thermostatic mixing valve through the temperature controllers respectively set, so as to control the water temperature of the outlet of the thermostatic mixing valve;

[0019] The water inlet of the cooling water inlet pipe is connected to the water outlet of the constant temperature mixing valve. The cooling water inlet pipe detects the temperature and pressure of the cooling water inlet through a cooling water temperature controller and a cooling water pressure controller, controls the flow rate of the cooling water inlet through a cooling water inlet electric pressure differential valve, detects the flow rate of the cooling water inlet through a cooling water inlet flowmeter, and heats the cooling water inlet entering the chiller through an electric heater.

[0020] Furthermore, when the water temperature of the deep reservoir is s When the temperature is >15.5℃, the chiller can operate normally, the valve connected to the three-way valve and the return branch pipe is closed, the valve of the water inlet connected to the thermostatic mixing valve and the return branch pipe is closed, and the branch pipe return subsystem is closed;

[0021] Flow rate q on deep reservoir water intake pipe215 and cooling water inlet pipe flow q 413 The cooling water inlet pressure controller displays the value P 412 The water intake pressure controller displays the value P 213 equal;

[0022] After the deep reservoir water enters the chiller to absorb heat, it is directly discharged through the return pipe of the cooling water return. The outlet valve connected to the three-way valve and the return branch pipe is closed, and the cooling water return is discharged to the tail water through the return pipe and the drain pipe.

[0023] When the load of the chiller changes, the cooling water inlet flow rate q 413 changes, the temperature t 411 unchanged, flow q 213 changes; when the flow q 213 When the water pressure changes, the water intake pressure controller displays the value P 213 To ensure that the preset pressure value of the water intake variable frequency pump remains unchanged, that is, P 213 =P 22 , the operating frequency of the water intake variable frequency pump changes.

[0024] Furthermore, when the water temperature of the deep reservoir is s When the temperature is <15.5℃, the deep reservoir water intake subsystem extracts deep reservoir water through the water intake variable frequency pump and delivers it to the constant temperature mixing valve. The chiller is ready to start. There is no cooling water return. The water flow rate entering the return branch pipe is, and the stepper motor inside the constant temperature mixing valve controls the valve connected to the return branch pipe to close. The valve connected to the deep reservoir water intake pipe is fully opened. The deep reservoir water directly enters the cooling water inlet pipe, and the electric heater starts to work, heating the deep reservoir water to 15.5℃ before sending it to the chiller.

[0025] After the deep reservoir water enters the chiller, it absorbs heat and heats up before entering the return water pipe. When the branch pipe return water flow meter shows that the flow rate is less than the return water flow meter, the return water frequency conversion pump starts, and part of the cooling water returns to the return water branch pipe, and then enters the constant temperature mixing valve through the return water frequency conversion pump. When the branch pipe return water flow meter shows that the flow rate is not 0, the constant temperature mixing valve starts to work, and the valve opening of the two water inlets is adjusted by the stepper motor to ensure that the water temperature entering the cooling water inlet pipe is a fixed value t, and t>15.5℃; when the cooling water inlet temperature controller shows the value t 411 When the temperature is >15.5℃, the electric heater stops working and the chiller operates normally;

[0026] When the deep reservoir water temperature t s <15.5℃, the following principles must be met when the chiller is operating normally:

[0027] 0 114 511 ​​;q 114 +q 215 =q 413 ;t 411 =t>15.5℃;

[0028] Among them, q 114 is the flow rate of branch return water, q 511 is the cooling water return flow rate, q 215 is the water intake flow rate of deep reservoir water, q 413 is the cooling water inlet flow rate; t 411 is the cooling water inlet temperature.

[0029] Compared with the prior art, the present invention collects deep reservoir water to a constant temperature mixing valve through a deep reservoir water intake subsystem, collects cooling water return water to a constant temperature mixing valve through a return water subsystem and a branch pipe return water subsystem, mixes deep reservoir water and cooling water return water in the constant temperature mixing valve, and then transports the mixed water to the chiller through a cooling water inlet pipe, so that the deep reservoir water and cooling water return water are used together, and it is ensured that the water temperature entering the chiller can meet the normal operation of the chiller. The present invention solves the problem of unstable or too low air conditioning cooling water temperature caused by direct application of deep reservoir water in the ventilation and air conditioning system of a hydropower station through the combined use of deep reservoir water and cooling water return water, and can control the cooling water inlet temperature of the chiller, thereby reducing construction costs, increasing the utilization efficiency of deep reservoir water, and improving the efficiency of the chiller. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0031] Explanation of the reference numerals: 1- branch pipe return water subsystem; 11- return water branch pipe; 12- return water variable frequency pump; 111- branch pipe return water filter; 112- branch pipe return water pressure controller; 113- branch pipe return water temperature controller; 114- branch pipe return water flow meter; 115- return water check valve; 2- deep reservoir water intake subsystem; 21- deep reservoir water intake pipe; 22- water intake variable frequency pump; 211- reservoir water filter; 212- water intake temperature controller; 213- water intake pressure controller; 214- water intake check valve; 215- water intake flow meter ; 3-constant temperature mixing valve; 31-constant temperature mixing valve hot water inlet; 32-constant temperature mixing valve cold water inlet; 33-constant temperature mixing valve outlet; 4-chiller; 41-cooling water inlet pipe; 42-cooling water inlet electric pressure differential valve; 43-electric heater; 411-cooling water temperature controller; 412-cooling water pressure controller; 413-cooling water inlet flowmeter; 5-return water subsystem; 51-return water main pipe; 52-cooling water return electric pressure differential valve; 53-three-way valve; 54-drain pipe; 511-return water flowmeter. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] The overall structural diagram of the mixed water utilization system of the deep reservoir water and the air conditioning cooling water return of the hydropower station is shown in the figure, which consists of a branch pipe return water subsystem 1, a deep reservoir water intake subsystem 2, a constant temperature mixing water valve 3, a chiller 4 and a return water subsystem 5.

[0034] The branch pipe return water subsystem 1 is composed of a return water branch pipe 11 , a return water variable frequency pump 12 , a branch pipe return water filter 111 , a branch pipe return water pressure controller 112 , a branch pipe return water temperature controller 113 , a branch pipe return water flow meter 114 and a return water check valve 115 . Specifically, the water outlet of the return branch pipe 11 is connected to the thermostatic mixing valve 3, and the water inlet of the return branch pipe 11 is connected to the return subsystem 5; the return frequency conversion pump 12, the branch return water filter 111, the branch return water pressure controller 112, the branch return water temperature controller 113, the branch return water flow meter 114 and the return water check valve 115 are all installed on the return branch pipe 11; the branch return water filter 111 is arranged between the three-way valve 53 and the return water variable frequency pump 12; the branch return water pressure controller 112 is arranged at the water outlet end of the return water variable frequency pump 12 and is electrically connected to the return water variable frequency pump 12, for controlling the water flow of the return branch pipe 11; the branch return water temperature controller 113 and the branch return water flow meter 114 are both arranged at the water outlet end of the branch return water pressure controller 112; the return water check valve 115 is arranged on the side close to the thermostatic mixing valve 3.

[0035] The deep reservoir water intake subsystem 2 is composed of a deep reservoir water intake pipe 21 , a water intake variable frequency pump 22 , a reservoir water filter 211 , a water intake temperature controller 212 , a water intake pressure controller 213 , a water intake check valve 214 and a water intake flow meter 215 . Specifically, the deep reservoir water intake pipe 21 connects the deep reservoir water intake port and the constant temperature mixing valve 3; the water intake frequency conversion pump 22, the reservoir water filter 211, the water intake temperature controller 212, the water intake pressure controller 213, the water intake check valve 214 and the water intake flow meter 215 are all installed on the deep reservoir water intake pipe 21; the reservoir water filter 211 is arranged between the deep reservoir water intake port and the water intake frequency conversion pump 22; the water intake temperature controller 212 and the water intake pressure controller 213 are both arranged at the water outlet end of the water intake frequency conversion pump 22, and the water intake pressure controller 213 is electrically connected to the water intake frequency conversion pump 22 for controlling the water flow rate of the deep reservoir water intake pipe 21; the water intake check valve 214 and the water intake flow meter 215 are arranged on the side close to the constant temperature mixing valve 3.

[0036] The thermostatic mixing valve 3 is composed of a thermostatic mixing valve hot water inlet 31, a thermostatic mixing valve cold water inlet 32 ​​and a thermostatic mixing valve outlet 33. The thermostatic mixing valve hot water inlet 31, the thermostatic mixing valve cold water inlet 32 ​​and the thermostatic mixing valve outlet 33 are all provided with a temperature controller, which is electrically connected to the thermostatic mixing valve 3 and is used to control the opening and closing degree of the cold and hot water inlets; the thermostatic mixing valve hot water inlet 31 is connected to the outlet of the return branch pipe 11; the thermostatic mixing valve cold water inlet 32 ​​is connected to the outlet of the deep reservoir water intake pipe 21; the thermostatic mixing valve outlet 33 is connected to the chiller 4.

[0037] The chiller 4 is provided with a cooling water inlet pipe 41, on which a cooling water inlet electric differential pressure valve 42, an electric heater 43, a cooling water temperature controller 411, a cooling water pressure controller 412 and a cooling water inlet flow meter 413 are installed; the water inlet of the cooling water inlet pipe 41 is connected to the water outlet 33 of the constant temperature mixing valve; the cooling water temperature controller 411 and the cooling water pressure controller 412 are arranged between the water outlet 33 of the constant temperature mixing valve and the cooling water inlet electric differential pressure valve 42; the cooling water inlet flow meter 413 is arranged at the water outlet end of the cooling water inlet electric differential pressure valve 42; the electric heater 43 is arranged at the water outlet end of the cooling water inlet flow meter 413.

[0038] The return water subsystem 5 includes a return water main pipe 51, a drain pipe 54 and a three-way valve 53; the water outlet of the return water main pipe 51, the water inlet of the drain pipe 54 and the water inlet of the return water branch pipe 11 are connected through the three-way valve 53; the water inlet of the return water main pipe 51 is connected to the cooling water return of the chiller 4; the water outlet of the drain pipe 54 is connected to the tail water; the return water main pipe 51 of the return water subsystem 5 is installed with a cooling water return electric pressure differential valve 52 and a return water flow meter 511; the cooling water return electric pressure differential valve 52 is arranged on a side close to the chiller 4, and the return water flow meter 511 is arranged at the outlet end of the cooling water return electric pressure differential valve 52.

[0039] The mixed water utilization method of deep reservoir water of hydropower station and air conditioning cooling water return water is as follows:

[0040] The cooling water return of the chiller 4 is discharged through the return water main 51 of the return water subsystem 5. The water outlet of the return water main 51 is connected to the water inlet of the drain pipe 54 and the water inlet of the return water branch pipe 11 of the branch return water subsystem 1 through the three-way valve 53. A part of the cooling water return is discharged to the tail water discharge through the drain pipe 54, and the other part of the cooling water return is discharged into the return water branch pipe 11 of the branch return water subsystem 1.

[0041] The outlet of the water return branch pipe 11 of the branch pipe water return subsystem 1 is connected to the thermostatic mixing valve 3;

[0042] The water inlet of the deep reservoir water intake subsystem 2 is connected to the deep reservoir water intake, and the water outlet of the deep reservoir water intake subsystem 2 is connected to the thermostatic mixing valve 3;

[0043] The thermostatic mixing valve 3 controls the water temperature at the outlet by adjusting the valve opening of the cooling water return water inlet and the valve opening of the deep reservoir water inlet. The outlet of the thermostatic mixing valve 3 is connected to the cooling water inlet pipe 41 of the chiller 4.

[0044] Specifically, the return water main 51 controls the flow rate of the cooling water return water through the cooling water return electric pressure differential valve 52 ; the return water main 51 detects the flow rate of the cooling water return water through the return water flowmeter 511 .

[0045] Specifically, the return branch pipe 11 filters impurities in the cooling water return water through the branch pipe return water filter 111, and the filtered cooling water return water flows into the return water variable frequency pump 12, and the return water variable frequency pump 12 pumps the filtered cooling water return water to the constant temperature mixing valve 3; the return branch pipe 11 controls the flow rate of the filtered cooling water return water through the branch pipe return water pressure controller 112, detects the flow rate of the filtered cooling water return water through the branch pipe return water flowmeter 114, detects the temperature of the filtered cooling water return water through the branch pipe return water temperature controller 113, and prevents the filtered cooling water return water from flowing back into the constant temperature mixing valve 3 through the return water check valve 115.

[0046] Specifically, the deep reservoir water intake subsystem 2 connects the deep reservoir water intake port and the constant temperature mixing valve 3 through the deep reservoir water intake pipe 21; the deep reservoir water intake pipe 21 filters impurities in the deep reservoir water through the reservoir water filter 211, and the filtered deep reservoir water flows into the water intake variable frequency pump 22, and the water intake variable frequency pump 22 pumps the filtered deep reservoir water to the constant temperature mixing valve 3; the deep reservoir water intake pipe 21 controls the flow rate of the filtered deep reservoir water through the water intake pressure controller 213, detects the flow rate of the filtered deep reservoir water through the water intake flowmeter 215, detects the temperature of the filtered deep reservoir water through the water intake temperature controller 212, and prevents the filtered deep reservoir water from flowing back into the constant temperature mixing valve 3 through the water intake check valve 214.

[0047] Specifically, the thermostatic mixing valve 3 inputs cooling water return water through the thermostatic mixing valve hot water inlet 31, inputs deep reservoir water through the thermostatic mixing valve cold water inlet 32, and outputs mixed water of cooling water return water and deep reservoir water through the thermostatic mixing valve outlet 33; the thermostatic mixing valve hot water inlet 31, the thermostatic mixing valve cold water inlet 32 ​​and the thermostatic mixing valve outlet 33 control the opening and closing degree of the thermostatic mixing valve hot water inlet 31 and the thermostatic mixing valve cold water inlet 32 ​​through their own set temperature controllers, thereby controlling the water temperature of the thermostatic mixing valve outlet 33.

[0048] Specifically, the water inlet of the cooling water inlet pipe 41 is connected to the water outlet 33 of the constant temperature mixing valve, the cooling water inlet pipe 41 detects the temperature and pressure of the cooling water inlet through the cooling water temperature controller 411 and the cooling water pressure controller 412, controls the flow rate of the cooling water inlet through the cooling water inlet electric pressure differential valve 42, detects the flow rate of the cooling water inlet through the cooling water inlet flowmeter 413, and heats the cooling water inlet entering the chiller 4 through the electric heater 43.

[0049] Example 1

[0050] When the water temperature of deep reservoir water is t s >15.5℃, the chiller 4 is operating normally, the valve connecting the three-way valve 53 and the return branch pipe 11 is closed, the valve of the water inlet connecting the thermostatic mixing valve 3 and the return branch pipe 11 is closed, and the branch pipe return subsystem 1 is closed. At this time, the flow rate q on the deep reservoir water intake pipe 21 is 215 The cooling water inlet pipe 41 flow rate q 413 The cooling water inlet pressure controller 412 displays the value P 412 The water intake pressure controller 213 displays the value P 213 Equal, that is, q 215 =q 413 , P 412 =P 213 .

[0051] The reservoir water filter 211 on the deep reservoir water intake pipe is used to filter impurities in the deep reservoir water to damage the water intake variable frequency pump 22, the constant temperature mixing valve 3 and the chiller 4. The water intake check valve 214 is used to prevent the deep reservoir water in the constant temperature mixing valve from flowing back.

[0052] After the deep reservoir water enters the chiller 4 to absorb heat, it is directly discharged through the return pipe 51 of the cooling water return. The outlet valve connected to the three-way valve 53 and the return branch pipe 11 is closed, and the cooling water return is discharged to the tail water through the return pipe 51 and the drain pipe 54;

[0053] When the load of chiller 4 changes, the cooling water inlet flow rate q 413 changes, the temperature t 411 unchanged, flow q 213 changes; when the flow q 213 When the water intake pressure controller 213 changes, the value P 213 To ensure that the preset pressure value of the constant pressure water intake variable frequency pump 22 remains unchanged, that is, P 213 =P 22 , the operating frequency of the water intake variable frequency pump 22 changes.

[0054] Example 2

[0055] When the water temperature of deep reservoir water is t s When the temperature is less than 15.5℃, the deep reservoir water intake subsystem 2 extracts deep reservoir water through the water intake variable frequency pump 22 and transports it to the constant temperature mixing valve 3. The chiller 2 is ready to start. There is no cooling water return for the time being. The water flow entering the return branch pipe 11 is 0. The stepper motor inside the constant temperature mixing valve 3 controls the valve connected to the return branch pipe 11 to close, and the valve connected to the deep reservoir water intake pipe 21 is fully opened. The deep reservoir water directly enters the cooling water inlet pipe 41, that is, the value displayed by the cooling water inlet flowmeter 413 is equal to the value displayed by the intake flowmeter 213. However, since the cooling water temperature is less than 15.5℃, that is, the cooling water inlet temperature controller 411 displays less than 15.5℃, the chiller cannot be started, so at this time the electric heater 43 starts to work, heating the deep reservoir water to 15.5℃ and then sending it to the chiller 4.

[0056] After the deep reservoir water enters the chiller, it absorbs heat and heats up before entering the return water pipe 51. For example, when the temperature rises to 5-7°C, when the branch pipe return water flow meter 114 shows that the flow rate is less than the return water flow meter 511, the return water frequency conversion pump 12 starts, and part of the cooling water returns to the return water branch pipe 11, and then enters the thermostatic mixing valve 3 through the return water frequency conversion pump 12. When the branch pipe return water flow meter 114 shows that the flow rate is not 0, the thermostatic mixing valve 3 starts to work, and the valve opening of the two water inlets is adjusted by the stepper motor to ensure that the water temperature entering the cooling water inlet pipe 41 is a fixed value t, and t>15.5°C; when the cooling water inlet temperature controller 411 shows the value t 411 When the temperature is >15.5℃, the electric heater 43 stops working and the chiller 4 operates normally.

[0057] When the chiller 4 operates normally, the temperature t and flow rate q of the cooling water of the chiller 4 are fixed, which means that the sum of the water flow rates through the two water inlets of the thermostatic mixing valve 3 is fixed and equal to the water inlet flow rate of the chiller cooling water, that is, q 114 +q 215 =q 413 . Deep reservoir water temperature t 212 To ensure that the water temperature t at the outlet 33 of the thermostatic mixing valve remains constant, the opening of the two inlet valves of the thermostatic mixing valve 3 is adjusted according to the water temperature t displayed by the branch return water temperature controller 113. 113 changes, thereby causing the water flow in the return water branch pipe 11 and the deep reservoir water intake pipe 21 to change.

[0058] When the water flow rates of the return branch pipe 11 and the deep reservoir water intake pipe 21 change, for the return branch pipe 11, when the flow rate q 114 When the branch return water pressure controller 112 changes, the value P 112 To ensure that the preset pressure value of the constant pressure return water variable frequency pump 12 remains unchanged, that is, P112 =P 12 , the operating frequency of the return water variable frequency pump 14 changes. In this process, it is necessary to ensure that 0 114 511 , when q 114 >q 511 When the return water frequency conversion pump 14 stops working immediately, it prevents the negative pressure from appearing in the condenser of the chiller 4 and damaging the chiller 4. The branch pipe return water filter 111 on the return water branch pipe 11 is used to filter the impurities in the cooling water return water to damage the return water frequency conversion pump 12 and the thermostatic mixing valve 3, and the branch pipe return water check valve 115 is used to prevent the return water in the thermostatic mixing valve 3 from flowing back.

[0059] For the deep reservoir water intake pipe 21, when the flow rate q 215 When the water intake pressure controller 213 changes, the value P 213 To ensure that the preset pressure value of the constant pressure return water variable frequency pump 22 remains unchanged, that is, P 213 =P 22 , the working frequency of the return water variable frequency pump 22 changes. The reservoir water filter 211 on the deep reservoir water intake pipe 21 is to filter impurities in the deep reservoir water to damage the water intake variable frequency pump 22, the thermostatic mixing valve 3 and the chiller 4, and the water intake check valve 214 is to prevent the deep reservoir water in the thermostatic mixing valve 3 from flowing back.

[0060] In summary, when the deep reservoir water temperature t s <15.5℃, the following three principles must be met when the chiller is operating normally:

[0061] 0 114 511 ;q 114 +q 215 =q 413 ;t 411 =t>15.5℃;

[0062] Among them, q 114 is the flow rate of branch return water, q 511 is the cooling water return flow rate, q 215 is the water intake flow rate of deep reservoir water, q 413 is the cooling water inlet flow rate; t 411 is the cooling water inlet temperature.

[0063] When the load of chiller 4 changes, the cooling water inlet flow rate q 413 changes, the temperature t 411 unchanged, that is, q 114 With q 215 changes, the water flow changes, the branch return water pressure controller P 112 ​​​​With water intake pressure controller P 213 To ensure that the preset pressure values ​​of the constant pressure return frequency conversion pump 12 and the water intake frequency conversion pump 22 remain unchanged, their operating frequencies change. However, to ensure the normal operation of the system, the above three principles must be met.

[0064] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A mixed water utilization system for deep reservoir water of a hydropower station and return water of air conditioning cooling water, characterized by: It includes a branch pipe water return subsystem (1), a deep reservoir water intake subsystem (2), a constant temperature water mixing valve (3), a chiller (4) and a water return subsystem (5); The branch pipe water return subsystem (1) comprises a water return branch pipe (11), the water outlet of the water return branch pipe (11) is connected to the thermostatic water mixing valve (3), and the water inlet of the water return branch pipe (11) is connected to the water return subsystem (5); The water inlet of the deep reservoir water intake subsystem (2) is connected to the deep reservoir water intake port, and the water outlet is connected to the thermostatic mixing valve (3); The chiller (4) is provided with a cooling water inlet pipe (41), and the cooling water inlet pipe (41) is connected to the water outlet of the thermostatic mixing valve (3); The return water subsystem (5) comprises a return water main pipe (51), a drain pipe (54) and a three-way valve (53); the water outlet of the return water main pipe (51), the water inlet of the drain pipe (54) and the water inlet of the return water branch pipe (11) are connected through the three-way valve (53); the water inlet of the return water main pipe (51) is connected to the cooling water return of the chiller (4); the water outlet of the drain pipe (54) is connected to the tail water; The thermostatic mixing valve (3) controls the water temperature at the water outlet by adjusting the valve opening of the cooling water return water inlet and the valve opening of the deep reservoir water inlet. The water outlet of the thermostatic mixing valve (3) is connected to the cooling water inlet pipe (41) of the chiller (4).

2. The mixed water utilization system of the deep reservoir water of the hydropower station and the return water of the air conditioning cooling water according to claim 1 is characterized by: The branch pipe return water subsystem (1) further comprises a return water variable frequency pump (12), a branch pipe return water filter (111), a branch pipe return water pressure controller (112), a branch pipe return water temperature controller (113), a branch pipe return water flow meter (114) and a return water check valve (115); The return water frequency conversion pump (12), the branch pipe return water filter (111), the branch pipe return water pressure controller (112), the branch pipe return water temperature controller (113), the branch pipe return water flow meter (114) and the return water check valve (115) are all installed on the return water branch pipe (11); the branch pipe return water filter (111) is arranged between the three-way valve (53) and the return water frequency conversion pump (12); the branch pipe return water pressure controller (112) is arranged at the water outlet of the return water frequency conversion pump (12) and is electrically connected to the return water frequency conversion pump (12) for controlling the water flow of the return water branch pipe (11); the branch pipe return water temperature controller (113) and the branch pipe return water flow meter (114) are both arranged at the water outlet of the branch pipe return water pressure controller (112); and the return water check valve (115) is arranged on a side close to the thermostatic mixing valve (3).

3. The mixed water utilization system of the deep reservoir water of the hydropower station and the return water of the air conditioning cooling water according to claim 2 is characterized by: The deep reservoir water intake subsystem (2) comprises a deep reservoir water intake pipe (21), a water intake variable frequency pump (22), a reservoir water filter (211), a water intake temperature controller (212), a water intake pressure controller (213), a water intake check valve (214) and a water intake flow meter (215); The deep reservoir water intake pipe (21) connects the deep reservoir water intake port and the thermostatic water mixing valve (3); The water intake variable frequency pump (22), the reservoir water filter (211), the water intake temperature controller (212), the water intake pressure controller (213), the water intake check valve (214) and the water intake flow meter (215) are all installed on the deep reservoir water intake pipe (21); the reservoir water filter (211) is arranged between the deep reservoir water intake port and the water intake variable frequency pump (22); the water intake temperature controller (212) and the water intake pressure controller (213) are both arranged at the water outlet end of the water intake variable frequency pump (22); the water intake pressure controller (213) is electrically connected to the water intake variable frequency pump (22) and is used to control the water flow of the deep reservoir water intake pipe (21); the water intake check valve (214) and the water intake flow meter (215) are arranged on a side close to the constant temperature water mixing valve (3).

4. The mixed water utilization system of the deep reservoir water of the hydropower station and the return water of the air conditioning cooling water according to claim 3 is characterized by: The thermostatic water mixing valve (3) comprises a thermostatic water mixing valve hot water inlet (31), a thermostatic water mixing valve cold water inlet (32) and a thermostatic water mixing valve outlet (33); The hot water inlet (31) of the thermostatic mixing valve, the cold water inlet (32) of the thermostatic mixing valve and the water outlet (33) of the thermostatic mixing valve are all provided with a temperature controller, and the temperature controller is electrically connected to the thermostatic mixing valve (3) and is used to control the opening and closing degree of the cold and hot water inlets; The hot water inlet (31) of the thermostatic mixing valve is connected to the outlet of the return branch pipe (11); the cold water inlet (32) of the thermostatic mixing valve is connected to the outlet of the deep reservoir water intake pipe (21); and the outlet (33) of the thermostatic mixing valve is connected to the chiller (4).

5. The mixed water utilization system of the deep reservoir water of the hydropower station and the return water of the air conditioning cooling water according to claim 4 is characterized by: A cooling water inlet electric pressure differential valve (42), an electric heater (43), a cooling water temperature controller (411), a cooling water pressure controller (412) and a cooling water inlet flow meter (413) are installed on the cooling water inlet pipe (41) of the chiller (4); The water inlet of the cooling water inlet pipe (41) is connected to the water outlet (33) of the thermostatic mixing valve; the cooling water temperature controller (411) and the cooling water pressure controller (412) are arranged between the water outlet (33) of the thermostatic mixing valve and the cooling water inlet electric pressure differential valve (42); the cooling water inlet flowmeter (413) is arranged at the water outlet end of the cooling water inlet electric pressure differential valve (42); and the electric heater (43) is arranged at the water outlet end of the cooling water inlet flowmeter (413).

6. The mixed water utilization system of the deep reservoir water of the hydropower station and the return water of the air conditioning cooling water according to claim 5 is characterized by: A cooling water return electric differential pressure valve (52) and a return flow meter (511) are installed on the return water main pipe (51) of the return water subsystem (5); the cooling water return electric differential pressure valve (52) is arranged on a side close to the chiller (4), and the return flow meter (511) is arranged at the water outlet end of the cooling water return electric differential pressure valve (52).

7. A method for utilizing mixed water of deep reservoir water of a hydropower station and return water of air conditioning cooling water using the system described in any one of claims 1 to 6, characterized in that: include: The cooling water return of the chiller (4) is discharged through the return water main pipe (51) of the return water subsystem (5), and the water outlet of the return water main pipe (51) is connected to the water inlet of the drain pipe (54) and the water inlet of the return water branch pipe (11) of the branch return water subsystem (1) via a three-way valve (53), so that a part of the cooling water return is discharged to the tail water discharge through the drain pipe (54), and the other part of the cooling water return is discharged into the return water branch pipe (11) of the branch return water subsystem (1); The water outlet of the water return branch pipe (11) of the branch pipe water return subsystem (1) is connected to the thermostatic water mixing valve (3); The water inlet of the deep reservoir water intake subsystem (2) is connected to the deep reservoir water intake port, and the water outlet of the deep reservoir water intake subsystem (2) is connected to the thermostatic mixing valve (3); The thermostatic mixing valve (3) controls the water temperature at the water outlet by adjusting the valve opening of the cooling water return water inlet and the valve opening of the deep reservoir water inlet. The water outlet of the thermostatic mixing valve (3) is connected to the cooling water inlet pipe (41) of the chiller (4).

8. The method for utilizing mixed water of deep reservoir water of a hydropower station and return water of air conditioning cooling water according to claim 7, characterized in that: The return water main pipe (51) controls the flow rate of the cooling water return water through the cooling water return water electric pressure differential valve (52); the return water main pipe (51) detects the flow rate of the cooling water return water through the return water flow meter (511); The return water branch pipe (11) filters impurities in the cooling water return water through the branch pipe return water filter (111), and the filtered cooling water return water flows into the return water variable frequency pump (12), and the return water variable frequency pump (12) pumps the filtered cooling water return water to the constant temperature mixing valve (3); the return water branch pipe (11) controls the flow rate of the filtered cooling water return water through the branch pipe return water pressure controller (112), detects the flow rate of the filtered cooling water return water through the branch pipe return water flowmeter (114), detects the temperature of the filtered cooling water return water through the branch pipe return water temperature controller (113), and prevents the filtered cooling water return water from flowing back into the constant temperature mixing valve (3) through the return water check valve (115); The deep reservoir water intake subsystem (2) is connected to the deep reservoir water intake port and the constant temperature mixing valve (3) through a deep reservoir water intake pipe (21); the deep reservoir water intake pipe (21) filters impurities in the deep reservoir water through a reservoir water filter (211), and the filtered deep reservoir water flows into the water intake variable frequency pump (22), and the water intake variable frequency pump (22) pumps the filtered deep reservoir water to the constant temperature mixing valve (3); the deep reservoir water intake pipe (21) controls the flow rate of the filtered deep reservoir water through a water intake pressure controller (213), detects the flow rate of the filtered deep reservoir water through a water intake flowmeter (215), detects the temperature of the filtered deep reservoir water through a water intake temperature controller (212), and prevents the filtered deep reservoir water from flowing back into the constant temperature mixing valve (3) through a water intake check valve (214); The thermostatic mixing valve (3) inputs cooling water return water through the thermostatic mixing valve hot water inlet (31), inputs deep reservoir water through the thermostatic mixing valve cold water inlet (32), and outputs mixed water of cooling water return water and deep reservoir water through the thermostatic mixing valve outlet (33); the thermostatic mixing valve hot water inlet (31), the thermostatic mixing valve cold water inlet (32) and the thermostatic mixing valve outlet (33) control the opening and closing degree of the thermostatic mixing valve hot water inlet (31) and the thermostatic mixing valve cold water inlet (32) through the temperature controllers respectively provided, thereby controlling the water temperature of the thermostatic mixing valve outlet (33); The water inlet of the cooling water inlet pipe (41) is connected to the water outlet (33) of the thermostatic mixing valve. The cooling water inlet pipe (41) detects the temperature and pressure of the cooling water inlet through a cooling water temperature controller (411) and a cooling water pressure controller (412), controls the flow rate of the cooling water inlet through a cooling water inlet electric pressure differential valve (42), detects the flow rate of the cooling water inlet through a cooling water inlet flowmeter (413), and heats the cooling water inlet entering the chiller (4) through an electric heater (43).

9. The method for utilizing mixed water of deep reservoir water of a hydropower station and return water of air conditioning cooling water according to claim 8, characterized in that: When the water temperature of deep reservoir water is t s When the temperature is >15.5℃, the chiller (4) is operating normally, the valve connecting the three-way valve (53) and the return branch pipe (11) is closed, the valve of the water inlet connecting the thermostatic mixing valve (3) and the return branch pipe (11) is closed, and the branch pipe return subsystem (1) is closed; Flow rate q on deep reservoir water intake pipe (21) 215 The cooling water inlet pipe (41) flow rate q 413 The cooling water inlet pressure controller (412) displays the value P 412 The water intake pressure controller (213) displays the value P 213 equal; After the deep reservoir water enters the chiller (4) and absorbs heat, it is directly discharged through the return pipe (51) of the cooling water return. The outlet valve connected to the three-way valve (53) and the return branch pipe (11) is closed, and the cooling water return is discharged to the tail water through the return pipe (51) and the drain pipe (54); When the load of the chiller (4) changes, the cooling water inlet flow rate q 413 changes, the temperature t 411 unchanged, flow q 213 changes; when the flow q 213 When the water intake pressure controller (213) changes, the value P 213 To ensure that the preset pressure value of the water intake variable frequency pump (22) remains unchanged, that is, P 213 =P 22 , the operating frequency of the water intake variable frequency pump (22) is changed.

10. The method for utilizing mixed water of deep reservoir water of a hydropower station and return water of air conditioning cooling water according to claim 9, characterized in that: When the water temperature of deep reservoir water is t s When the temperature is less than 15.5℃, the deep reservoir water intake subsystem (2) extracts deep reservoir water through the water intake variable frequency pump (22) and transports it to the constant temperature mixing valve (3). The chiller (2) is ready to start. There is no cooling water return. The water flow entering the return branch pipe (11) is 0. The internal stepper motor of the constant temperature mixing valve (3) controls the valve connected to the return branch pipe (11) to close, and the valve connected to the deep reservoir water intake pipe (21) is fully opened. The deep reservoir water directly enters the cooling water inlet pipe (41), and the electric heater (43) starts to work, heating the deep reservoir water to 15.5℃ before sending it to the chiller (4); After the deep reservoir water enters the chiller, it absorbs heat and rises in temperature before entering the return water pipe (51). When the branch pipe return water flow meter (114) displays a flow rate less than that of the return water flow meter (511), the return water variable frequency pump (12) starts, and part of the cooling water returns to the return water branch pipe (11), and then enters the thermostatic mixing valve (3) through the return water variable frequency pump (12). When the branch pipe return water flow meter (114) displays a flow rate not equal to 0, the thermostatic mixing valve (3) starts to work, and the valve openings of the two water inlets are adjusted by a stepper motor to ensure that the water temperature entering the cooling water inlet pipe (41) is a fixed value t, and t>15.5°C; when the cooling water inlet temperature controller (411) displays the value t 411 When the temperature is >15.5°C, the electric heater (43) stops working and the chiller (4) operates normally; When the deep reservoir water temperature t s <15.5℃, the following principles must be met when the chiller is operating normally: 0<q 114 <q 511 ;q 114 +q 215 =q 413 ;t 411 =t>15.5℃; Among them, q 114 is the flow rate of branch return water, q 511 is the cooling water return flow rate, q 215 is the water intake flow rate of deep reservoir water, q 413 is the cooling water inlet flow rate; t 411 is the cooling water inlet temperature.

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