Hydropower station dehumidification air-conditioning system for cascade energy utilization

Abstract

The invention discloses a hydropower station dehumidification air-conditioning system with cascade energy utilization. The hydropower station dehumidification air-conditioning system comprises an indoor environment treatment device, a steam compression dehumidification device, a natural energy utilization device, a heat recovery device and a condensation monitoring device. The natural energy utilization device, the steam compression dehumidification device, the condensation heat recovery device and the indoor environment treatment device are utilized, and the control method is utilized, so that the annual operation energy efficiency is improved, the response time of the starting stage is shortened, and the natural cold source is fully utilized to reduce the energy consumption of the air conditioning system.

Description

Technical Field

[0001] The invention relates to the field of dehumidification of hydropower stations, in particular to a dehumidification air-conditioning system of a hydropower station utilizing cascade energy. Background Art

[0002] Hydropower stations have the characteristics of large installed capacity, many units, many electrical equipment, high heat generation, significant moisture transfer in underground caverns, and large wet loads. Therefore, the indoor air of the cavern group needs to be deheated and dehumidified most of the year, which causes a lot of energy consumption. How to reduce this part of energy consumption is of great significance for saving the environmental regulation of underground caverns. Water source heat pumps are considered to be renewable energy utilization technologies with great energy-saving potential. In particular, using surface water (river water, lake water, sea water) or groundwater as cooling water to remove condensation heat from the condenser is an energy-saving and low-carbon refrigeration technology. It is an ideal choice to use it as a cold and heat source for thermal and humid environment regulation of underground hydropower stations.

[0003] However, the existing technical solutions do not fully consider the differences in heat and humidity loads between the office area and high-heat generating equipment, as well as the differences in the requirements for creating a thermal environment, and it is difficult to fully utilize natural cold sources to reduce the energy consumption of the air conditioning system. At the same time, in summer, the cooling load is large, and in winter, the water temperature cannot reach the dew point temperature required for dehumidification. There are problems with dehumidification, and the energy consumption of dehumidification is large. The coupling of air supply parameters in different seasons is strong and the adjustment is difficult. In addition, when the temperature-controlled dehumidification air conditioning system is in operation, since the air conditioner requires a long startup process, including compressor startup, pressure difference establishment, lubricating oil heating, coil heating / cooling and other processes, there is a long response time.

[0004] The existing dehumidification system has defects such as the inability to achieve cascade utilization of energy and low secondary heat transfer efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a hydropower station dehumidification and air-conditioning system with cascade energy utilization, including an indoor environment treatment device, a steam compression dehumidification device, a natural energy utilization device, a heat recovery device and a condensation monitoring device.

[0006] The condensation monitoring device monitors the surface of the hydropower station generator set in real time, and controls the hydropower station dehumidification air conditioning system to operate in the first working condition or the second working condition according to the condensation situation on the surface of the hydropower station generator set.

[0007] The indoor environment treatment device comprises a fresh air inlet, a return air inlet, a primary surface cooling section, a secondary surface cooling section, a heating device and an air supply fan.

[0008] The primary surface cooling section is connected to the natural energy utilization device, and condenses, cools and dehumidifies the fresh air through surface water.

[0009] The secondary surface cooling section is connected to the steam compression device to dehumidify by steam compression.

[0010] The heating device heats the dehumidified air to increase its temperature.

[0011] The air supply fan mixes the fresh air and the return air through the fresh air inlet and the return air inlet to supply the dehumidified air to the indoor environment.

[0012] The natural energy utilization device comprises a water intake device, a temperature reduction device and a water return device.

[0013] The water intake device is used to extract surface water and send it into the primary surface cooling section.

[0014] The cooling device is used to reduce the outlet air temperature of the condensing fan;

[0015] The water return device returns the cooling water after condensation and heat exchange to the surface.

[0016] The steam compression device comprises a four-way valve, a compressor, a condensing fan, a condenser and a throttle valve.

[0017] The condensing fan condenses the refrigerant.

[0018] The compressor compresses the refrigerant and sends it to the condenser through the four-way valve to release heat.

[0019] The refrigerant is sent to the secondary surface cooling section through a throttle valve to absorb heat by direct expansion, and then sent to the compressor.

[0020] The heat recovery device is used to recover heat and transmit it to the heating device.

[0021] The operation process of the dehumidification and air conditioning system of a hydropower station is as follows:

[0022] When condensation occurs on the surface of the generator set of the hydropower station, the condensation monitoring device generates a first dehumidification signal, thereby controlling the dehumidification and air-conditioning system of the hydropower station to operate in the first operating condition.

[0023] When the dehumidification and air conditioning system of the hydropower station is operated in the first condition T max After a certain period of time, if the dew droplet diameter on the surface of the hydropower station's generator set has not decreased, the condensation monitoring device generates a second dehumidification signal, thereby controlling the hydropower station's dehumidification and air-conditioning system to operate in the second operating condition.

[0024] When the dehumidification and air-conditioning system of the hydropower station is in the first operating condition, the natural energy utilization device extracts surface water and sends it to the primary surface cooling section.

[0025] Surface water is used as cooling water to condense, cool and dehumidify the fresh air in the primary surface cooling section.

[0026] The heating device uses electric heating to heat and raise the temperature of the air after refrigeration and dehumidification.

[0027] The heat recovery device recovers the waste heat generated by the generator set.

[0028] When the dehumidification and air conditioning system of the hydropower station is in the second working condition, the natural energy utilization device extracts surface water and sends it to the primary surface cooling section. The surface water is used as cooling water to condense and cool the fresh air in the primary surface cooling section.

[0029] The compressor of the vapor compression dehumidifier compresses the refrigerant and sends it to the condenser to release heat.

[0030] The natural energy utilization device uses surface water as cooling water to carry away the excess heat released by the refrigerant.

[0031] The refrigerant absorbs heat through direct expansion in the secondary surface cooling section through the throttle valve and is sent to the compressor for compression to circulate the fresh air for cooling and dehumidification.

[0032] The heat recovery device recovers the heat released by the condenser.

[0033] Furthermore, the condensation monitoring device includes a camera, a temperature sensor, an image processor and a central control unit.

[0034] The camera captures the surface image of the generator set of the hydropower station and transmits the image to the image processor.

[0035] The image processor uses an image processing algorithm to identify the surface image of the hydropower station generator set, determines whether there are dewdrops in the surface image of the hydropower station generator set, and transmits the identification result to the central control unit.

[0036] If dewdrops are present in the surface image of the hydropower station generator set, the central control unit generates a first dehumidification signal, controls the operation of the indoor environment treatment device and the natural energy utilization device, utilizes surface water for dehumidification, and records the operation time T of the indoor environment treatment device.

[0037] When T≥Tmax, the camera captures the surface image of the generator set of the hydropower station and transmits it to the image processor.

[0038] The image processor processes the surface image of the hydropower station generator set by using an image processing algorithm to determine whether the dew droplet diameter in the surface image of the hydropower station generator set is reduced.

[0039] If the dew droplet size decreases, the central control unit maintains the current operating state. If the dew droplet size does not decrease, the central control unit generates a second dehumidification signal to control the operation of the indoor environment treatment device, the steam compression dehumidification device, the natural energy utilization device, and the heat recovery device to perform dehumidification by combining surface water and refrigerant.

[0040] The temperature sensor is used to monitor the indoor dry-bulb temperature tin.

[0041] Furthermore, the heat recovery device is used to recover the heat released by the refrigerant in the condenser.

[0042] When the indoor dry-bulb temperature tin is less than the set target temperature tset, the heat recovery device transfers the heat to the heating device for release, and heats the air after refrigeration and dehumidification, so that the temperature of the air after condensation and dehumidification rises to tset.

[0043] Furthermore, the heat recovery device is a condensation heat recovery device, which is used to recover the heat released by the refrigerant in the condenser.

[0044] Furthermore, the steps of the image processor using the image processing algorithm to process the surface image of the hydropower station generator set include: image binarization, element feature extraction, image sequence processing, and image feature recognition.

[0045] Furthermore, the temperature sensor monitors the indoor dry bulb temperature tin and the surface temperature tsuf of the hydropower station generator set, and transmits them to the central control unit.

[0046] The central control unit determines whether to operate the hydropower station dehumidification air conditioning system based on the indoor dry bulb temperature tin, the surface temperature tsuf of the hydropower station generator set, whether there is condensation on the surface of the unit, and the size of the dew droplets.

[0047] Furthermore, the indoor environment treatment device also includes a filter.

[0048] The filter filters the air output by the blower.

[0049] Furthermore, the water intake device includes a first regulating valve, a second regulating valve, a water intake pump, a water intake pipe, and a water intake head.

[0050] The water intake pump extracts surface water through the water intake pipe and the water intake head.

[0051] When the dehumidification and air-conditioning system of the hydropower station operates in the first working condition, the first regulating valve is opened, and the water intake pump sends surface water into the primary surface cooling section through the first regulating valve.

[0052] When the dehumidification and air-conditioning system of the hydropower station operates in the second working condition, the first regulating valve and the second regulating valve are opened, and the water intake pump sends surface water into the primary surface cooling section through the first regulating valve and the second regulating valve.

[0053] Furthermore, when the heating device heats the dehumidified air using the heat recovered by the heat recovery device, if the indoor dry-bulb temperature tin<test after heating, the heating device reheats the dehumidified air by electric heating.

[0054] Furthermore, during the dehumidification and air-conditioning system process of the hydropower station, the condensation monitoring device monitors the dew particle size on the surface of the hydropower station's generator set in real time, and performs feedback adjustment on the operating power of the natural energy utilization device and the steam compression dehumidification device according to the dew particle size.

[0055] The technical effect of the present invention is unquestionable. The present invention utilizes a natural energy utilization device, a steam compression dehumidification device, a condensation heat recovery device, an indoor environment treatment device, and a control method to improve the energy efficiency of the whole year operation and shorten the response time of the startup phase, so as to make full use of the natural cold source to reduce the energy consumption of the air-conditioning system.

[0056] The present invention utilizes natural energy to perform primary surface cooling and dehumidification on the air, and utilizes a direct expansion system to perform secondary surface cooling and dehumidification on the air, thereby realizing cascade energy utilization. The present invention realizes heating of the air after cooling and dehumidification through a heating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 This is a schematic diagram of the dehumidification and air conditioning system structure of a hydropower station;

[0058] Figure 2 This is a schematic diagram of operation control;

[0059] In the figure: filter 1, first-stage surface cooling 2 sections, second-stage surface cooling 3 sections, heating device 4, air blower 5, four-way valve 6, compressor 7, condensing fan 8, condenser 9, throttle valve 10, cooling device 11, condensing heat recovery device 12, water intake pump 13, water intake pipe 14, water intake head 15, first regulating valve 16, second regulating valve 17, water return device, camera 18, temperature sensor 19, image processor 20, central control unit 21. DETAILED DESCRIPTION

[0060] The present invention is further described below in conjunction with the embodiments, but it should not be understood that the above subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, various substitutions and changes are made according to the common technical knowledge and customary means in the art, which should all be included in the protection scope of the present invention.

[0061] Embodiment 1:

[0062] See also Figure 1 to Figure 2 A dehumidification and air-conditioning system for a hydropower station with cascade energy utilization includes an indoor environment treatment device, a steam compression dehumidification device, a natural energy utilization device, a heat recovery device and a condensation monitoring device.

[0063] The condensation monitoring device monitors the surface of the hydropower station generator set in real time, and controls the hydropower station dehumidification air conditioning system to operate in the first working condition or the second working condition according to the condensation situation on the surface of the hydropower station generator set.

[0064] The indoor environment treatment device includes a fresh air inlet, a return air inlet, a primary surface cooling section 2, a secondary surface cooling section 3, a heating device 4 and a blower 5.

[0065] The primary surface cooling section 2 is connected to the natural energy utilization device, and condenses, cools and dehumidifies the fresh air through surface water.

[0066] The secondary surface cooling section 3 is connected to a steam compression device to dehumidify by steam compression.

[0067] The heating device 4 heats the dehumidified air.

[0068] The air blower 5 mixes the fresh air and the return air through the fresh air inlet and the return air inlet to deliver the dehumidified air to the indoor environment.

[0069] The natural energy utilization device includes a water intake device, a cooling device 11, and a water return device.

[0070] The water intake device is used to extract surface water and send it into the primary surface cooling section 2.

[0071] The cooling device 11 is used to reduce the outlet air temperature of the condensing fan 8;

[0072] The water return device returns the cooling water after condensation and heat exchange to the surface.

[0073] The steam compression device includes a four-way valve 6 , a compressor 7 , a condensing fan 8 , a condenser 9 , and a throttle valve 10 .

[0074] The condensing fan 8 condenses the refrigerant. The condensing fan 8 and the compressor 7 operate simultaneously.

[0075] The compressor 7 compresses the refrigerant and sends it to the condenser 9 through the four-way valve 6 to release heat.

[0076] The refrigerant is sent into the secondary surface cooling section 3 through the throttle valve 10 to absorb heat by direct expansion, and then sent into the compressor 7.

[0077] The heat recovery device includes a device for recovering heat and transmitting the heat to the heating device 4 .

[0078] The operation process of the dehumidification and air conditioning system of a hydropower station is as follows:

[0079] When condensation occurs on the surface of the generator set of the hydropower station, the condensation monitoring device generates a first dehumidification signal, thereby controlling the dehumidification and air-conditioning system of the hydropower station to operate in the first operating condition.

[0080] When the dehumidification and air conditioning system of the hydropower station is operated in the first condition T max =1h later, if the dew droplet diameter on the surface of the generator set of the hydropower station has not decreased, the condensation monitoring device generates a second dehumidification signal, thereby controlling the dehumidification and air-conditioning system of the hydropower station to operate in the second operating condition.

[0081] When the dehumidification and air-conditioning system of the hydropower station is in the first operating condition, the natural energy utilization device extracts surface water and sends it to the primary surface cooling section 2.

[0082] Surface water is used as cooling water to condense, cool and dehumidify the fresh air in the primary surface cooling section 2.

[0083] The heating device 4 uses electric heating to heat and raise the temperature of the air after cooling and dehumidification.

[0084] The heat recovery device recovers the waste heat generated by the generator set.

[0085] When the dehumidification air conditioning system of the hydropower station is in the second working condition, the natural energy utilization device extracts surface water and sends it to the primary surface cooling section 2. The surface water is used as cooling water in the primary surface cooling section 2 to condense, cool and dehumidify the fresh air.

[0086] The compressor 7 of the vapor compression dehumidification device compresses the refrigerant and sends it to the condenser 9 to release heat.

[0087] The natural energy utilization device uses surface water as cooling water to carry away the excess heat released by the refrigerant.

[0088] The refrigerant absorbs heat in the direct expansion stage 3 of the secondary surface cooling through the throttle valve 10, and is sent to the compressor 7 for compression, so as to circulate and cool and dehumidify the fresh air.

[0089] The heat recovery device recovers the heat released by the condenser 9.

[0090] The condensation monitoring device includes a camera 18 , a temperature sensor 19 , an image processor 20 and a central control unit 21 .

[0091] The camera 18 captures the surface image of the generator set of the hydropower station and transmits the image to the image processor 19 .

[0092] The image processor 20 uses an image processing algorithm to identify the surface image of the hydropower station generator set, determines whether there are dewdrops in the surface image of the hydropower station generator set, and transmits the identification result to the central control unit 21.

[0093] If dewdrops are present in the surface image of the hydropower station generator set, the central control unit 21 generates a first dehumidification signal, controls the operation of the indoor environment treatment device and the natural energy utilization device, utilizes surface water for dehumidification, and records the operation time T of the indoor environment treatment device.

[0094] When T≥Tmax, the camera 18 captures the surface image of the generator set of the hydropower station and transmits it to the image processor 20 .

[0095] The image processor 20 processes the surface image of the hydropower station generator set by using an image processing algorithm to determine whether the dew droplet diameter in the surface image of the hydropower station generator set is reduced.

[0096] If the dew droplet size decreases, the central control unit 21 maintains the current operating state. If the dew droplet size does not decrease, the central control unit 21 generates a second dehumidification signal to control the operation of the indoor environment treatment device, the steam compression dehumidification device, the natural energy utilization device, and the heat recovery device to perform dehumidification by combining surface water and refrigerant.

[0097] The temperature sensor 19 is used to monitor the indoor dry-bulb temperature tin.

[0098] The heat recovery device is used to recover the heat released by the refrigerant in the condenser 9 .

[0099] When the indoor dry-bulb temperature tin is less than the set target temperature tset=23°C, the heat recovery device transfers the heat to the heating device 4 for release, and heats the air after refrigeration and dehumidification, so that the temperature of the air after condensation and dehumidification rises to tset.

[0100] The heat recovery device is a condensation heat recovery device 12 , which is used to recover the heat released by the refrigerant in the condenser 9 .

[0101] The steps of the image processor 20 processing the surface image of the hydropower station generator set by using the image processing algorithm include: image binarization, element feature extraction, image sequence processing, and image feature recognition.

[0102] The temperature sensor 19 monitors the indoor dry bulb temperature tin and the surface temperature tsuf of the hydropower station generator set, and transmits them to the central control unit 21.

[0103] The central control unit 21 determines whether to operate the hydropower station dehumidification air conditioning system based on the indoor dry-bulb temperature tin, the surface temperature tsuf of the hydropower station generator set, whether there is condensation on the unit surface, and the size of the dew droplets.

[0104] The steps to determine whether to operate the dehumidifying air conditioner system of the hydropower station are as follows: determine the dew point temperature td according to the indoor dry-bulb temperature tin and relative humidity RH; if the dew point temperature td < tsur and the average dew particle size is reduced by 80%, then operate the dehumidifying air conditioner system of the hydropower station.

[0105] The indoor environment treatment device further includes a filter 1.

[0106] The filter 1 filters the air output by the air supply fan 5.

[0107] The water intake device includes a first regulating valve 16, a second regulating valve 17, a water intake pump 13, a water intake pipe 14, and a water intake head 15.

[0108] The water intake pump 13 extracts surface water through the water intake pipe 14 and the water intake head 15.

[0109] When the dehumidifying air conditioner system of the hydropower station operates in the first working condition, the first regulating valve 16 is opened, and the water intake pump 13 sends the surface water into the primary surface cooler 2 through the first regulating valve 16.

[0110] When the dehumidifying air conditioner system of the hydropower station operates in the second working condition, the first regulating valve 16 and the second regulating valve 17 are opened, and the water intake pump 13 sends the surface water into the primary surface cooler 2 through the first regulating valve 16 and the second regulating valve 17.

[0111] When the heating device 4 uses the heat recovered by the heat recovery device to heat and raise the temperature of the air after dehumidification treatment, if the indoor dry-bulb temperature after heating < test, then the heating device 4 reheats the air after dehumidification treatment by means of electric heating.

[0112] During the process of the dehumidifying air conditioner system of the hydropower station, the dew condensation monitoring device monitors the dew particle size on the surface of the hydropower generating unit in real time, and feedback-adjusts the operating power of the natural energy utilization device and the vapor compression dehumidification device according to the dew particle size.

[0113] Embodiment 2:

[0114] A dehumidifying air conditioner system for a hydropower station with cascade energy utilization includes an indoor environment treatment device, a vapor compression dehumidification device, a natural energy utilization device, a heat recovery device, and a dew condensation monitoring device.

[0115] The dew condensation monitoring device monitors the surface of the hydropower generating unit in real time, and controls the dehumidifying air conditioner system of the hydropower station to operate in the first working condition or the second working condition according to the dew condensation situation on the surface of the hydropower generating unit.

[0116] The indoor environment treatment device includes a fresh air inlet, a return air inlet, a primary surface cooler 2, a secondary surface cooler 3, a heating device 4, and an air supply fan 5.

[0117] The primary surface cooling section 2 is connected to the natural energy utilization device, and condenses, cools and dehumidifies the fresh air through surface water.

[0118] The secondary surface cooling section 3 is connected to a steam compression device to dehumidify by steam compression.

[0119] The heating device 4 heats the dehumidified air.

[0120] The air blower 5 mixes the fresh air and the return air through the fresh air inlet and the return air inlet to deliver the dehumidified air to the indoor environment.

[0121] The natural energy utilization device includes a water intake device, a cooling device 11, and a water return device.

[0122] The water intake device is used to extract surface water and send it into the primary surface cooling section 2.

[0123] The cooling device 11 is used to reduce the outlet air temperature of the condensing fan 8;

[0124] The water return device returns the cooling water after condensation and heat exchange to the surface.

[0125] The steam compression device includes a four-way valve 6 , a compressor 7 , a condensing fan 8 , a condenser 9 , and a throttle valve 10 .

[0126] The condensing fan 8 condenses the refrigerant.

[0127] The compressor 7 compresses the refrigerant and sends it to the condenser 9 through the four-way valve 6 to release heat.

[0128] The refrigerant is sent into the secondary surface cooling section 3 through the throttle valve 10 to absorb heat by direct expansion, and then sent into the compressor 7.

[0129] The heat recovery device includes a device for recovering heat and transmitting the heat to the heating device 4 .

[0130] The operation process of the dehumidification and air conditioning system of a hydropower station is as follows:

[0131] When condensation occurs on the surface of the generator set of the hydropower station, the condensation monitoring device generates a first dehumidification signal, thereby controlling the dehumidification and air-conditioning system of the hydropower station to operate in the first operating condition.

[0132] When the dehumidification and air conditioning system of the hydropower station is operated in the first condition T max After a certain period of time, if the dew droplet diameter on the surface of the hydropower station's generator set has not decreased, the condensation monitoring device generates a second dehumidification signal, thereby controlling the hydropower station's dehumidification and air-conditioning system to operate in the second operating condition.

[0133] When the dehumidification and air-conditioning system of the hydropower station is in the first operating condition, the natural energy utilization device extracts surface water and sends it to the primary surface cooling section 2.

[0134] Surface water is used as cooling water to condense, cool and dehumidify the fresh air in the primary surface cooling section 2.

[0135] The heating device 4 uses electric heating to heat and raise the temperature of the air after cooling and dehumidification.

[0136] The heat recovery device recovers the waste heat generated by the generator set.

[0137] When the dehumidification air conditioning system of the hydropower station is in the second working condition, the natural energy utilization device extracts surface water and sends it to the primary surface cooling section 2. The surface water is used as cooling water in the primary surface cooling section 2 to condense, cool and dehumidify the fresh air.

[0138] The compressor 7 of the vapor compression dehumidification device compresses the refrigerant and sends it to the condenser 9 to release heat.

[0139] The natural energy utilization device uses surface water as cooling water to carry away the excess heat released by the refrigerant.

[0140] The refrigerant absorbs heat in the direct expansion stage 3 of the secondary surface cooling through the throttle valve 10, and is sent to the compressor 7 for compression, so as to circulate and cool and dehumidify the fresh air.

[0141] The heat recovery device recovers the heat released by the condenser 9.

[0142] Embodiment 3:

[0143] A dehumidification and air-conditioning system for a hydropower station with cascade energy utilization, the technical content of which is the same as that of Example 2. Furthermore, the condensation monitoring device includes a camera 18, a temperature sensor 19, an image processor 20 and a central control unit 21.

[0144] The camera 18 captures the surface image of the generator set of the hydropower station and transmits the image to the image processor 19 .

[0145] The image processor 20 uses an image processing algorithm to identify the surface image of the hydropower station generator set, determines whether there are dewdrops in the surface image of the hydropower station generator set, and transmits the identification result to the central control unit 21.

[0146] If dewdrops are present in the surface image of the hydropower station generator set, the central control unit 21 generates a first dehumidification signal, controls the operation of the indoor environment treatment device and the natural energy utilization device, utilizes surface water for dehumidification, and records the operation time T of the indoor environment treatment device.

[0147] When T≥Tmax, the camera 18 captures the surface image of the generator set of the hydropower station and transmits it to the image processor 20 .

[0148] The image processor 20 processes the surface image of the hydropower station generator set by using an image processing algorithm to determine whether the dew droplet diameter in the surface image of the hydropower station generator set is reduced.

[0149] If the dew droplet size decreases, the central control unit 21 maintains the current operating state. If the dew droplet size does not decrease, the central control unit 21 generates a second dehumidification signal to control the operation of the indoor environment treatment device, the steam compression dehumidification device, the natural energy utilization device, and the heat recovery device to perform dehumidification by combining surface water and refrigerant.

[0150] The temperature sensor 19 is used to monitor the indoor dry-bulb temperature tin.

[0151] Embodiment 4:

[0152] A dehumidification and air-conditioning system for a hydropower station with cascade energy utilization, the technical content of which is the same as any one of Examples 2-3, and further, the heat recovery device is used to recover the heat released by the refrigerant in the condenser 9.

[0153] When the indoor dry-bulb temperature tin is less than the set target temperature tset, the heat recovery device transfers the heat to the heating device 4 for release, and heats the air after refrigeration and dehumidification, so that the temperature of the air after condensation and dehumidification rises to tset.

[0154] Embodiment 5:

[0155] A dehumidification and air-conditioning system for a hydropower station with cascade energy utilization, the technical content of which is the same as any one of Examples 2-4. Furthermore, the heat recovery device is a condensation heat recovery device 12, which is used to recover the heat released by the refrigerant in the condenser 9.

[0156] Embodiment 6:

[0157] A dehumidification and air-conditioning system for a hydropower station with cascade energy utilization, the technical content of which is the same as any one of embodiments 2-5. Furthermore, the image processor 20 uses an image processing algorithm to process the surface image of a hydropower station generator set, including the steps of: image binarization, element feature extraction, image sequence processing, and image feature recognition.

[0158] Embodiment 7:

[0159] A dehumidification and air conditioning system for a hydropower station with cascade energy utilization, the technical content of which is the same as any one of embodiments 2-6. Furthermore, the temperature sensor 19 monitors the indoor dry-bulb temperature tin and the surface temperature tsuf of the hydropower station generator set, and transmits them to the central control unit 21.

[0160] The central control unit 21 determines whether to operate the hydropower station dehumidification air conditioning system based on the indoor dry-bulb temperature tin, the surface temperature tsuf of the hydropower station generator set, whether there is condensation on the unit surface, and the size of the dew droplets.

[0161] Embodiment 8:

[0162] A dehumidification and air-conditioning system for a hydropower station with cascade energy utilization, the technical content of which is the same as any one of Examples 2-7, and further, the indoor environment treatment device also includes a filter 1.

[0163] The filter 1 filters the air output by the blower 5 .

[0164] Embodiment 9:

[0165] A dehumidification and air-conditioning system for a hydropower station with cascade energy utilization, the technical content of which is the same as any one of embodiments 2-8. Furthermore, the water intake device includes a first regulating valve 16, a second regulating valve 17, a water intake pump 13, a water intake pipe 14, and a water intake head 15.

[0166] The water intake pump 13 extracts surface water through the water intake pipe 14 and the water intake head 15 .

[0167] When the dehumidification and air-conditioning system of the hydropower station operates in the first operating condition, the first regulating valve 16 is opened, and the water intake pump 13 delivers surface water to the primary surface cooling section 2 through the first regulating valve 16 .

[0168] When the dehumidification and air-conditioning system of the hydropower station operates in the second working condition, the first regulating valve 16 and the second regulating valve 17 are opened, and the water intake pump 13 sends surface water into the primary surface cooling section 2 through the first regulating valve 16 and the second regulating valve 17 .

[0169] Embodiment 10:

[0170] A dehumidification and air-conditioning system for a hydropower station with cascade energy utilization, the technical content of which is the same as any one of Examples 2-9. Furthermore, when the heating device 4 utilizes the heat recovered by the heat recovery device to heat the air after dehumidification treatment, if the indoor dry-bulb temperature after heating is less than test, the heating device 4 reheats the air after dehumidification treatment by electric heating.

[0171] Embodiment 11:

[0172] A dehumidification and air-conditioning system for a hydropower station with cascade energy utilization, the technical content of which is the same as any one of Examples 2-10. Furthermore, in the process of the dehumidification and air-conditioning system of the hydropower station, a condensation monitoring device monitors the dew particle size on the surface of the hydropower station generator set in real time, and feedback-adjusts the operating power of the natural energy utilization device and the steam compression dehumidification device according to the dew particle size.

[0173] Embodiment 12:

[0174] A dehumidification and air conditioning system for a hydropower station with cascade energy utilization includes an indoor environment treatment device, a steam compression dehumidification device, a natural energy utilization device, and a heat recovery device. The indoor environment treatment device includes a fresh air inlet, a return air inlet, a filter 1, two first-level surface cooling sections, three second-level surface cooling sections, a heating device 4, and a blower 5. The steam compression device includes a four-way valve 6, a compressor 7, a condensing fan 8, a condenser 9, and a throttle valve 10; the natural energy utilization device includes a water intake device, a cooling device 11, and a water return device, wherein the water intake device includes a water intake pump 13, a water intake pipe 14, a water intake head 15, a first regulating valve 16, and a second regulating valve 17; the condensation monitoring device includes a camera 18, a temperature sensor 19, an image processor 20, and a central control unit 21; and the heat recovery device includes a condensation heat recovery device 12.

[0175] When using the primary surface cooling 2 for refrigeration and dehumidification, the natural energy utilization device is in operation, and the surface water is used as cooling water in the primary surface cooling 2 section through the water intake device to condense and cool the fresh air, and at the same time, the heating device 4 uses electric heating to heat and raise the temperature of the air after refrigeration and dehumidification. When only the primary surface cooling 2 cannot reach the refrigeration set humidity, and the secondary surface cooling 3 is turned on for mechanical refrigeration, the steam compression dehumidification device is in operation, and the refrigerant compressed by the compressor 7 enters the condenser 9 to release heat, and the released heat is recovered by the condensation heat recovery device 12. When the condensation heat recovery device 12 cannot meet the condensation requirements, the cooling device is in operation, and the natural energy utilization device is used to use the surface water as cooling water to take away the excess heat released by the refrigerant, and then the refrigerant passes through the throttle valve 10 to absorb heat in the secondary surface cooling 3 section through direct expansion, and is then sucked in by the compressor 7 for compression, and this cycle is repeated to condense, cool and dehumidify the fresh air. At the same time, the heating device 4 uses the heat recovered by the condensation heat recovery device 12 to heat the air after refrigeration and dehumidification, and decides whether to electrically heat it again according to the outlet air temperature, so that the temperature of the fresh air delivered to the unit reaches a comfortable working environment temperature for the power station staff.

[0176] The indoor environment treatment device includes a fresh air inlet, a return air inlet, a filter 1, a first-level surface cooling 2 section, a second-level surface cooling 3 section, a heating device 4, and a blower 5. The indoor environment treatment process is as follows: the central control unit 21 reads the indoor environment parameters, the camera 18, the temperature sensor 19 transmits the data to the image processor 20, the central control unit 21 processes and determines that when the unit surface condenses, the central control unit 21 sends an operation signal to control the dehumidification air conditioning system to operate, and the blower 5 mixes the fresh air and the return air to send air through the filter 1 to start air dehumidification. According to the existing data in the database, the dehumidification mode is selected. When the refrigeration setting humidity can be reached by only running the first-level surface cooling 2, the first-level surface cooling 2 is mainly used. When the refrigeration setting humidity cannot be reached by only running the first-level surface cooling 2, the mechanical refrigeration of the second-level surface cooling 3 is turned on. The heating device 4 is used to heat the air after refrigeration and dehumidification, and whether to electrically heat it again is determined according to the outlet air temperature, so that the temperature of the fresh air sent to the unit reaches the comfortable working environment temperature of the power station staff.

[0177] The natural energy utilization device includes a water intake device, a cooling device, and a water return device, wherein the water intake device includes a water intake pump 13, a water intake pipe 14, a water intake head 15, a first regulating valve 16, and a second regulating valve 17; the heat recovery device includes a condensation heat recovery device 12.

[0178] The natural energy utilization process is as follows: when only the primary surface cooling section 2 is in operation, the water intake device is in operation, and the surface water is used as cooling water to condense and dehumidify the air in the primary surface cooling section 2 through the primary surface cooling section 2; the return water device is in operation to send the cooling water that has undergone condensation and heat exchange back to the surface, and the cycle repeats.

[0179] When the primary surface cooling 2 and the secondary surface cooling 3 are operated at the same time, the water intake device is operated, and the surface water is used as cooling water to condense and dehumidify the air in the primary surface cooling 2 section through the primary surface cooling 2 section. The return water device is operated to send the cooling water that has undergone condensation and heat exchange back to the surface, and the cycle is repeated; when the condensation heat recovery device 12 cannot meet the condensation requirements of the condenser 9, part of the surface water enters the cooling device as cooling water, taking away part of the heat released by the refrigerant that enters the condenser 9 after being compressed by the compressor 7 and releases heat. The return water device is operated to send the cooling water that has undergone condensation and heat exchange back to the surface, and the cycle is repeated.

[0180] The heat recovery device includes a condensation heat recovery device 12. The heat recovery process is that when the primary surface cooling 2 and the secondary surface cooling 3 are running at the same time, the heat recovery device and the secondary surface cooling 3 are running synchronously. The condensation heat recovery device 12 takes away the heat released by the refrigerant that enters the condenser 9 after being compressed by the compressor 7 and releases the heat in the heating device 4, so that the temperature of the air after condensation and dehumidification rises.

[0181] The vapor compression dehumidification device includes a compressor 7, a four-way valve 6, a throttle valve 10, a condenser 9, and a condensing fan 8. The vapor compression dehumidification process is as follows: when the primary surface cooler 2 and the secondary surface cooler 3 are operating simultaneously, the vapor compression dehumidification device operates synchronously with the secondary surface cooler 3. The compressor 7 starts to compress the refrigerant, and the refrigerant compressed by the compressor 7 enters the condenser 9 through the four-way valve 6 to release heat. The released heat is carried and transferred to other places by the condensation heat recovery device 12 and the cooling device. Then, the refrigerant after condensation heat release passes through the throttle valve 10 and directly expands and absorbs heat in the secondary surface cooler 3 section to condense and dehumidify the air in the secondary surface cooler 3 section.

[0182] The dew condensation monitoring device includes a camera 18, a temperature sensor 19, an image processor 20, and a central control unit 21. The dew condensation monitoring process is as follows: the camera 18 monitors the surface of the unit to obtain the surface image of the unit. The image processor 20 performs operations such as image binarization, feature extraction, and image sequence processing on the image. At the same time, the temperature sensor 19 monitors the indoor dry bulb temperature tin and the surface temperature tsuf of the equipment for auxiliary monitoring. Finally, data such as whether dew condensation occurs on the surface of the unit and the size of the dew droplets are obtained, and all the data is summarized to the central control unit 21.

[0183] The dew condensation control method includes two working conditions, namely: the natural energy condensation dehumidification working condition and the natural energy collaborative mechanical refrigeration condensation dehumidification working condition. When it is monitored that the dew condensation on the surface of the unit reaches the start-up condition of the dehumidification system, the central control unit 21 first controls the opening of the natural energy utilization device, and the refrigeration and dehumidification system only operates in the natural energy condensation dehumidification working condition; when the dew droplet size still does not decrease after the natural energy utilization device is turned on for refrigeration and dehumidification, at this time, only using the natural energy utilization device cannot meet the initial requirements, and the central control unit 21 controls the opening of the mechanical refrigeration dehumidification device, and the refrigeration and dehumidification system operates in the natural energy collaborative mechanical refrigeration condensation dehumidification working condition. During the entire refrigeration and dehumidification process, the dew condensation monitoring device continuously operates to feedback and adjust the operating power of the natural energy utilization device and the mechanical refrigeration dehumidification device to achieve the purpose of energy saving.

[0184] The return air heating control method is that when the indoor dry bulb temperature tin < the indoor set target temperature tset, at this time, the temperature of the return air after dehumidification treatment is lower than the human comfort temperature. In the natural energy condensation dehumidification working condition, the central control unit 21 controls the heating device 4 to use electric heating to heat the return air through the four-way valve 6 to make it reach tset; in the natural energy collaborative mechanical refrigeration condensation dehumidification working condition, the central control unit 21 controls the opening of the heat recovery cycle to recover and utilize the heat released by the refrigerant in the condenser 9 to heat the return air, that is, to dissipate heat from the condenser 9 to make it reach tset. When only using the heat recovery cycle to heat the return air cannot make it reach tset, the central control unit 21 controls the opening of the electric heating for auxiliary heating of the return air.

[0185] The heat recovery control method is that under the condition of natural energy and mechanical refrigeration condensation and dehumidification, when the indoor dry-bulb temperature tin>tset indoor set target temperature, the return air temperature after dehumidification treatment reaches the human body comfort temperature, and there is no need to heat the return air. The central control unit 21 controls the heat recovery device not to operate, and uses the natural energy utilization device to drive the cooling device to operate to cool the condenser 9; ...

Claims

1. A hydropower station dehumidification and air conditioning system with cascade energy utilization, characterized in that: It includes an indoor environment treatment device, a steam compression dehumidification device, a natural energy utilization device, a heat recovery device and a condensation monitoring device. The condensation monitoring device monitors the surface of the hydropower station generator set in real time, and controls the hydropower station dehumidification air conditioning system to operate in the first working condition or the second working condition according to the condensation situation on the surface of the hydropower station generator set; The indoor environment treatment device comprises a fresh air inlet, a return air inlet, a primary surface cooling section (2), a secondary surface cooling section (3), a heating device (4) and a blower (5); The first-level surface cooling section (2) is connected to the natural energy utilization device to condense, cool and dehumidify the fresh air through surface water; The secondary surface cooling section (3) is connected to a steam compression device to dehumidify by steam compression; The heating device (4) heats and raises the temperature of the dehumidified air; The air supply fan (5) mixes the fresh air and the return air through the fresh air inlet and the return air inlet to supply the dehumidified air to the indoor environment; The natural energy utilization device comprises a water intake device, a temperature reduction device (11), and a water return device; The water intake device is used to extract surface water and send it into the primary surface cooling section (2); The temperature reduction device (11) is used to reduce the outlet air temperature of the condensing fan (8); The water return device returns the cooling water after condensation and heat exchange to the surface; The steam compression device comprises a four-way valve (6), a compressor (7), a condensing fan (8), a condenser (9), and a throttle valve (10); The condensing fan (8) condenses the refrigerant; The compressor (7) compresses the refrigerant and sends it to the condenser (9) through the four-way valve (6) to release heat; The refrigerant is sent into the secondary surface cooling section (3) through a throttle valve (10) to undergo direct expansion and heat absorption, and then is sent into the compressor (7); The heat recovery device includes a device for recovering heat and transmitting it to a heating device (4); The operation process of the dehumidification and air conditioning system of a hydropower station is as follows: When condensation occurs on the surface of the generator set of the hydropower station, the condensation monitoring device generates a first dehumidification signal, thereby controlling the dehumidification air conditioning system of the hydropower station to operate in the first working condition; When the dehumidification and air conditioning system of the hydropower station is operated in the first condition T max After a certain time, if the dew droplet diameter on the surface of the generator set of the hydropower station does not decrease, the condensation monitoring device generates a second dehumidification signal, thereby controlling the dehumidification air conditioning system of the hydropower station to operate in the second working condition; When the dehumidification and air conditioning system of the hydropower station is in the first operating condition, the natural energy utilization device extracts surface water and sends it to the primary surface cooling section (2); Surface water is used as cooling water to condense and dehumidify the fresh air in the primary surface cooling section (2); The heating device (4) uses electric heating to heat and raise the temperature of the air after refrigeration and dehumidification; The heat recovery device recovers the waste heat generated by the generator set; When the dehumidification and air conditioning system of the hydropower station is in the second working condition, the natural energy utilization device extracts surface water and sends it to the primary surface cooling section (2); the surface water is used as cooling water to condense, cool and dehumidify the fresh air in the primary surface cooling section (2); The compressor (7) of the steam compression dehumidification device compresses the refrigerant and sends it to the condenser (9) to release heat; The natural energy utilization device uses surface water as cooling water to take away the excess heat released by the refrigerant; The refrigerant passes through the throttle valve (10) and absorbs heat in the secondary surface cooling (3) section by direct expansion, and is then sent to the compressor (7) for compression, thereby circulating the fresh air to cool and dehumidify it. The heat recovery device recovers the heat released by the condenser (9).

2. A hydropower station dehumidification and air conditioning system for cascade energy utilization according to claim 1, characterized in that: The condensation monitoring device comprises a camera (18), a temperature sensor (19), an image processor (20) and a central control unit (21); The camera (18) captures the surface image of the hydropower station generator set and transmits it to the image processor (19); The image processor (20) uses an image processing algorithm to identify the surface image of the hydropower station generator set, determines whether dew drops are present in the surface image of the hydropower station generator set, and transmits the identification result to the central control unit (21); If dewdrops are present in the surface image of the hydropower station generator set, the central control unit (21) generates a first dehumidification signal, controls the operation of the indoor environment treatment device and the natural energy utilization device, utilizes surface water for dehumidification, and records the operation time T of the indoor environment treatment device; When T≥Tmax, the camera (18) captures the surface image of the hydropower station generator set and transmits it to the image processor (20); The image processor (20) processes the surface image of the hydropower station generator set using an image processing algorithm to determine whether the dew droplet diameter in the surface image of the hydropower station generator set is reduced; If the dew droplet size decreases, the central control unit (21) maintains the current operating state; if the dew droplet size does not decrease, the central control unit (21) generates a second dehumidification signal to control the operation of the indoor environment treatment device, the steam compression dehumidification device, the natural energy utilization device, and the heat recovery device, and dehumidifies in a manner combining surface water and refrigerant; The temperature sensor (19) is used to monitor the indoor dry-bulb temperature tin.

3. A hydropower station dehumidification and air conditioning system for cascade energy utilization according to claim 2, characterized in that: The heat recovery device is used to recover the heat released by the refrigerant in the condenser (9); When the indoor dry-bulb temperature tin is less than the set target temperature tset, the heat recovery device transfers the heat to the heating device (4) for release, and heats the air after refrigeration and dehumidification, so that the temperature of the air after condensation and dehumidification rises to tset.

4. The dehumidification and air conditioning system for a hydropower station with cascade energy utilization according to claim 3 is characterized by: The heat recovery device is a condensation heat recovery device (12) used to recover the heat released by the refrigerant in the condenser (9).

5. The dehumidification and air conditioning system for a hydropower station with cascade energy utilization according to claim 2 is characterized in that: The steps of the image processor (20) using an image processing algorithm to process the surface image of the generator set of a hydropower station include: image binarization, element feature extraction, image sequence processing, and image feature recognition.

6. The dehumidification and air conditioning system for a hydropower station with cascade energy utilization according to claim 2 is characterized by: The temperature sensor (19) monitors the indoor dry bulb temperature tin and the surface temperature tsuf of the hydropower station generator set, and transmits them to the central control unit (21); The central control unit (21) determines whether to operate the hydropower station dehumidification air conditioning system by combining the indoor dry-bulb temperature tin, the surface temperature tsuf of the hydropower station generator set, whether there is condensation on the surface of the unit, and the size of the dew droplets.

7. The dehumidification and air conditioning system for a hydropower station with cascade energy utilization according to claim 1 is characterized by: The indoor environment treatment device also includes a filter (1); The filter (1) filters the air output by the air blower (5).

8. The dehumidification and air conditioning system for a hydropower station with cascade energy utilization according to claim 1 is characterized by: The water intake device comprises a first regulating valve (16), a second regulating valve (17), a water intake pump (13), a water intake pipe (14), and a water intake head (15); The water intake pump (13) extracts surface water through the water intake pipe (14) and the water intake head (15); When the dehumidification and air conditioning system of the hydropower station operates in the first operating condition, the first regulating valve (16) is opened, and the water intake pump (13) sends surface water into the primary surface cooling section (2) through the first regulating valve (16); When the dehumidification and air conditioning system of the hydropower station operates in the second operating condition, the first regulating valve (16) and the second regulating valve (17) are opened, and the water intake pump (13) sends surface water into the primary surface cooling section (2) through the first regulating valve (16) and the second regulating valve (17).

9. The dehumidification and air conditioning system for a hydropower station with cascade energy utilization according to claim 1, characterized in that: When the heating device (4) uses the heat recovered by the heat recovery device to heat the air after the dehumidification treatment, if the indoor dry bulb temperature tin is less than test after the heating, the heating device (4) reheats the air after the dehumidification treatment by electric heating.

10. The dehumidification and air conditioning system for a hydropower station with cascade energy utilization according to claim 1, characterized in that: During the dehumidification and air-conditioning system process of the hydropower station, the condensation monitoring device monitors the dew particle size on the surface of the hydropower station's generator set in real time, and performs feedback adjustment on the operating power of the natural energy utilization device and the steam compression dehumidification device based on the dew particle size.

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