Enhanced fan blade air-heat deicing system and method

Abstract

The present invention discloses an enhanced air-heat deicing system and method for fan blades, which adds a second blower, a humidifier or a hydrogenator, a pressure gauge, and a humidity sensor to the air-heat deicing system for fan blades, the outlet of the second blower is connected to the outlet of the humidifier, and the second blower and the humidifier are electrically connected to the deicing hub control cabinet, the deicing hub control cabinet controls the actions of the second blower and the humidifier, and the deicing hub control cabinet collects the pressure value of the pressure gauge, the humidity value of the blade cavity, the operating state parameters of the second blower and the humidifier, and uploads them to the deicing main control cabinet and the remote monitoring center, the remote monitoring center issues an action instruction to the deicing main control cabinet according to the received pressure value of the pressure gauge, the humidity value of the blade cavity, the operating state parameters of the second blower and the humidifier, and the deicing main control cabinet transmits the action instruction to the pressurization control system and the humidification control system of the deicing hub control cabinet. The present invention can improve the air-heat deicing speed of fan blades.

Description

Technical Field

[0001] The invention relates to a wind turbine generator set, and in particular to an enhanced air-heat deicing system and method for fan blades. Background Art

[0002] Wind turbines located in mountainous areas in northern and southern my country are faced with the problem of blade ice covering and being unable to generate electricity in winter: since there is no effective way to remove ice from wind turbine blades, they can only wait for the weather to warm up and the ice to melt naturally, resulting in huge losses in power generation. The ice also has a serious impact on the safety, service life and maintenance costs of the units, causing safety hazards to surrounding people, livestock and equipment, and impacting the stable operation of the power grid, exacerbating the contradiction between electricity consumption and power generation during the ice period.

[0003] Gas-heat deicing is a relatively mature method for deicing fan blades. It can be used for both the modification of existing fans and the installation of new fans. It has a long service life, is easy to maintain, will not attract lightning, and has a certain anti-icing ability. The principle of gas-heat deicing is that the inside of the blade is a closed cavity. A blower and a heater are installed in the blade cavity to heat the cold air in the blade, which is then sent out by the blower and circulated along the designed air duct. The hot air heats the inner surface of the blade, and the heat is transferred from the inner surface to the outer surface of the blade. When the temperature of the outer surface of the blade exceeds zero degrees, the anti-icing and deicing effects are achieved.

[0004] Gas-heat deicing heats the air inside the blades, and the heat is carried to various parts of the blades through the flow of air. The hot air then exchanges heat with the inner surface of the blades it contacts, and the heat is transferred to the outer surface of the blades through the blade material to de-ice. If a better anti-icing effect is required, the flowing air needs to carry more heat, but due to the characteristics of the blade material, the temperature cannot be too high, because too high a temperature will accelerate the aging of the blade material and shorten its service life. In addition, because the heat capacity of natural air is relatively low, and the temperature after heating cannot exceed the upper limit of the blade material tolerance, the hot air does not carry much heat, the design power of the heater is limited, and the hot air cools down quickly during the flow process, and the heating of the blades is uneven, which makes the gas-heat deicing slow and the effect is not ideal. Summary of the invention

[0005] The technical problem to be solved by the present invention is that, in view of the shortcoming that the air-heat deicing speed of the fan blades of a wind turbine generator set is slow, the present invention provides an enhanced air-heat deicing system and method for fan blades which can improve the air-heat deicing speed.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An enhanced fan blade air-heat deicing system includes a heater for heating air in a fan blade inner cavity, a first blower for transmitting the heated air in the blade inner cavity, and:

[0008] a second blower for providing pressurized air to the inner cavity of the blade;

[0009] Humidifiers, used to increase the humidity of pressurized air;

[0010] A pressure gauge is used to measure the air pressure inside the blade cavity in real time;

[0011] Humidity sensor, used to measure the air humidity in the blade cavity in real time;

[0012] a de-icing hub control cabinet, comprising a pressurization control system for controlling the second blower, a humidification control system for controlling the humidifier, and a signal acquisition system for collecting and transmitting pressure values ​​of a pressure gauge, humidity values ​​of the blade cavity, and operating states of the second blower and the humidifier to a de-icing main control cabinet;

[0013] A de-icing power distribution box, which supplies power to the first blower, the second blower and the humidifier;

[0014] The de-icing main control cabinet is used to send the pressure value of the pressure gauge, the humidity value of the blade cavity, the operating status parameters of the second blower and the humidifier to the remote monitoring center through the fan data line, and transmit the instructions of the remote monitoring center to the de-icing hub control cabinet;

[0015] The outlet of the second blower is connected to the outlet of the humidifier, the second blower is electrically connected to the pressurization control system and the de-icing power distribution box, the humidifier is electrically connected to the humidification control system and the de-icing power distribution box, the pressurization control system controls the action of the second blower, the humidification control system controls the action of the humidifier, the signal acquisition system collects the pressure value of the pressure gauge, the humidity value of the blade cavity, the operating status parameters of the second blower and the humidifier and uploads them to the de-icing main control cabinet, the de-icing main control cabinet sends the received pressure value of the pressure gauge, the humidity value of the blade cavity, the operating status parameters of the second blower and the humidifier to the remote monitoring center through the fan data line, the remote monitoring center issues an action instruction to the de-icing main control cabinet according to the received pressure value of the pressure gauge, the humidity value of the blade cavity, the operating status parameters of the second blower and the humidifier, and the de-icing main control cabinet transmits the action instruction to the pressurization control system and the humidification control system of the de-icing hub control cabinet.

[0016] Preferably, a pressure relief valve is installed on the fan blade. When the inner cavity pressure of the blade is greater than or equal to the opening threshold of the pressure relief valve, the pressure relief valve opens, and the second blower and the humidifier are turned off at the same time, and the pressure in the inner cavity of the blade is relieved; when the inner cavity pressure of the blade is less than the opening threshold of the pressure relief valve, the pressure relief valve closes.

[0017] Preferably, the second blower, humidifier or hydrogenator, and pressure relief valve are installed on the manhole baffle at the root of the fan blade, and the pressure gauge, humidity sensor or hydrogen concentration sensor is installed on the manhole baffle at the root of the fan blade or inside the blade.

[0018] Based on the same inventive concept, the present invention also provides an enhanced fan blade air-heat deicing system, which includes a heater for heating the air in the inner cavity of the fan blade and a first blower for transmitting the heated air in the inner cavity of the blade, and:

[0019] a second blower for providing pressurized air to the inner cavity of the blade;

[0020] A hydrogenator is used to inject hydrogen into the inner cavity of the blade to increase the specific heat capacity of the air in the inner cavity of the blade;

[0021] A pressure gauge is used to measure the air pressure inside the blade cavity in real time;

[0022] A hydrogen concentration sensor is used to measure the hydrogen concentration in the blade cavity in real time;

[0023] A de-icing hub control cabinet, including a pressurization control system for controlling the second blower, a hydrogenation control system for controlling the hydrogenation machine, and a signal acquisition system for collecting and transmitting pressure values ​​of a pressure gauge, hydrogen concentration values ​​in the blade cavity, and operating states of the second blower and the hydrogenation machine to a de-icing main control cabinet;

[0024] De-icing power distribution box, supplying power to the first blower, the second blower and the hydrogenator;

[0025] The de-icing main control cabinet is used to send the pressure value of the pressure gauge, the hydrogen concentration value in the blade cavity, the operating status parameters of the second blower and the hydrogenator to the remote monitoring center through the blower data line, and transmit the instructions of the remote monitoring center to the de-icing hub control cabinet;

[0026] The outlet of the second blower is connected to the outlet of the hydrogenator, the second blower is electrically connected to the pressurization control system and the deicing power distribution box, the hydrogenator is electrically connected to the hydrogenation control system and the deicing power distribution box, the pressurization control system controls the action of the second blower, the hydrogenation control system controls the action of the hydrogenator, the signal acquisition system collects the pressure value of the pressure gauge, the hydrogen concentration value in the blade cavity, the operating status parameters of the second blower and the hydrogenator and uploads them to the deicing main control cabinet, the deicing main control cabinet sends the received pressure value of the pressure gauge, the hydrogen concentration value in the blade cavity, the operating status parameters of the second blower and the hydrogenator to the remote monitoring center through the blower data line, the remote monitoring center issues an action instruction to the deicing main control cabinet according to the received pressure value of the pressure gauge, the hydrogen concentration value in the blade cavity, the operating status parameters of the second blower and the hydrogenator, and the deicing main control cabinet then transmits the action instruction to the pressurization control system and the hydrogenation control system of the deicing hub control cabinet.

[0027] Preferably, the second blower, hydrogenator and pressure relief valve are installed on the manhole baffle at the root of the fan blade, and the pressure gauge and hydrogen concentration sensor are installed on the manhole baffle at the root of the fan blade or inside the blade.

[0028] Based on the same inventive concept, the present invention also provides a method for deicing using the enhanced fan blade air-heat deicing system, which comprises:

[0029] During anti-icing or de-icing, the second blower and the humidifier are turned on. When the pressure value of the blade cavity detected by the pressure gauge is greater than or equal to the first set pressure value, the second blower is stopped; when the pressure value of the blade cavity detected by the pressure gauge is less than the second set pressure value, the second blower is turned on; when the humidity value detected by the humidity sensor is greater than or equal to the first set humidity value, the humidifier is stopped; when the humidity value detected by the humidity sensor is less than the second set humidity value, the humidifier is turned on;

[0030] When anti-icing or de-icing is completed, turn off the power supply of the second blower and humidifier.

[0031] Based on the same inventive concept, the present invention also provides a method for deicing using the enhanced fan blade air-heat deicing system, which comprises:

[0032] During anti-icing or de-icing, the second blower and the hydrogenator are turned on. When the pressure value of the blade cavity detected by the pressure gauge is greater than or equal to the first set pressure value, the second blower is stopped; when the pressure value of the blade cavity detected by the pressure gauge is less than the second set pressure value, the second blower is turned on; when the hydrogen concentration value detected by the hydrogen concentration sensor is greater than or equal to the first set concentration value, the hydrogenator is stopped; when the hydrogen concentration value detected by the hydrogen concentration sensor is less than the second set concentration value, the hydrogenator is turned on;

[0033] When anti-icing or de-icing is completed, turn off the power supply of the second blower and hydrogenator.

[0034] The design principle of the present invention is:

[0035] The ratio of the heat absorbed by a certain mass of a substance when its temperature rises to the product of the mass of the substance and the temperature rise is called the specific heat capacity (specific heat) of the substance, represented by the symbol c, as shown in the following formula:

[0036] ,

[0037] Where Q is the heat absorbed (or released), m is the mass of the object, ΔT=tt o , represents the change in temperature after endothermic (or exothermic) absorption, where t is the temperature after heating, t o is the initial temperature.

[0038] From the above specific heat capacity formula, we can get: Q=cmΔT. For the air in the inner cavity of the fan blade, Q is the amount of heat applied by the heater to the air flowing through, c is the specific heat capacity of the air flowing through, m is the mass of the air flowing through, and t o is the initial temperature of the air entering the heater, and t is the temperature of the air after being heated by the heater.

[0039] Due to the limitation of the material properties of the fan blades, in actual use, t is a constant. When the blade surface temperature is controlled at 0°C, the anti-icing efficiency is the highest. If t is a constant and the air duct remains unchanged, t o Therefore, ΔT can be considered as a constant.

[0040] In order to enhance the anti-icing capability, Q must be increased. To increase Q, c and m need to be increased under the premise that ΔT is constant.

[0041] In order to increase c, the present invention adds a gas with a larger specific heat capacity than the air in the blade cavity, such as water vapor, hydrogen, etc., into the air in the blade cavity; in order to increase m, the present invention extracts gas from outside the blade and injects it into the blade cavity after pressurizing it, so that the air density of the gas in the blade cavity is increased, thereby increasing the mass m of the air in the blade cavity.

[0042] Therefore, based on the existing gas-thermal deicing device (first blower + heater) of the fan, the present invention blows pressurized air into the inner cavity of the blade through the second blower to increase the density of the air in the inner cavity of the blade, and at the same time, water is mixed into the blown air through a humidifier, or hydrogen is directly mixed into the air in the inner cavity of the blade through a hydrogenator to increase the specific heat capacity of the air in the inner cavity of the blade. According to the heat formula Q=cmΔT, after the air in the blade cavity is heated to the design temperature that the blade can withstand, it will absorb more heat, thereby increasing the gas-thermal deicing speed and improving the gas-thermal deicing effect.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. The anti-icing limit temperature of the present invention is lower: because the air quality and specific heat capacity of the blade cavity are improved at the safe temperature of the blade, the air in the blade cavity contains more heat after heating, and more heat can be transferred to the outer surface of the blade during anti-icing, thereby enhancing the anti-icing ability of the gas-heat deicing system and making the anti-icing limit temperature of the system lower;

[0045] 2. The present invention is more suitable for fans in high mountain and plateau wind farms: Because of the high altitude, thin air, smaller air mass per unit volume, and smaller heat capacity, the gas-heat deicing effect is worse than that at low altitudes. After adding a second blower and a humidifier (or hydrogenator), the anti-deicing effect can be greatly improved, which is of great significance to the promotion and application of gas-heat deicing technology;

[0046] 3. The heating and deicing of the whole blade of the present invention is more balanced: the length of the blade of a large fan is more than 30 meters, and the length of the blade of a large fan with a capacity of more than 5MW produced now exceeds 90 meters. The first blower and heater of the gas-heat deicing system are generally installed at the root of the blade. The hot air blows from the leading edge cavity of the blade to the tip of the blade, and then from the tip process hole to the trailing edge cavity of the blade and the belly cavity back to the root of the blade. The air duct is very long. The larger the heat capacity of the circulating air, the slower the cooling speed of the circulation process, the more balanced the heat obtained by each part of the blade in the air duct, the more balanced the heating and deicing of the whole blade, and the better the effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 The diagram is a schematic diagram of the blade root structure of the enhanced fan blade air-heat deicing system of the present invention.

[0049] Figure 2 This is a structural diagram of the de-icing power distribution box.

[0050] Figure 3 This is a schematic diagram of the structure of the de-icing hub control cabinet.

[0051] Figure 4 This is a schematic diagram of the structure of the de-icing main control cabinet.

[0052] Figure 5 The schematic diagram of the enhanced gas-heat deicing system of the present invention is shown in the dotted box, which shows the equipment or instruments added to the original gas-heat deicing device of the present invention. Other devices outside the box are compatible with the enhanced system.

[0053] Figure 6 This is a control flow chart of a humidifier used in the present invention.

[0054] Figure 7 This is a control flow chart of the hydrogenator used in the present invention.

[0055] In the figure: 1- wind turbine blade, 2- manhole baffle, 3- pressure relief valve, 4- root, 5- pressure gauge, 6- second blower, 7- humidity sensor, 8- humidifier, 9- check valve, 10- deicing hub control cabinet, 11- deicing power distribution box, 12- deicing main control cabinet, 13- heater, 14- first blower, 15- remote monitoring center. DETAILED DESCRIPTION

[0056] The present invention is further described below in conjunction with specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0057] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] See also Figure 1 - Figure 6 An embodiment of the enhanced fan blade air-heat deicing system of the present invention comprises:

[0060] The heater 13 is installed in the wind turbine blade 1 and is used to heat the air in the blade cavity;

[0061] A first blower 14 is installed in the wind turbine blade 1 and is used to transmit the heated air in the blade cavity to the air duct in the blade;

[0062] A second blower 6, mounted on the outer surface of the manhole baffle 2 at the root 4 of the wind turbine blade 1, is used to provide pressurized air to the inner cavity of the blade, and preferably a pressurized blower is used;

[0063] A humidifier 8, mounted on the outer surface of the manhole baffle 2 at the root 4 of the wind turbine blade 1, for increasing the humidity of the pressurized air;

[0064] A pressure gauge 5 is mounted on the manhole baffle 2 at the root 4 of the wind turbine blade 1 and is used to measure the air pressure in the inner cavity of the blade in real time;

[0065] A humidity sensor 7 is mounted on the manhole baffle 2 at the root 4 of the wind turbine blade 1 and is used to measure the air humidity in the inner cavity of the blade in real time;

[0066] The de-icing hub control cabinet 10 includes a pressurization control system for controlling the second blower 6, a humidification control system for controlling the humidifier 8, and a signal acquisition system for collecting and transmitting the pressure value of the pressure gauge, the humidity value of the blade cavity, the operating status of the second blower and the humidifier to the de-icing main control cabinet 12;

[0067] The de-icing power distribution box 11 supplies power to the first blower 14, the second blower 6, the humidifier 8, etc.;

[0068] The deicing main control cabinet 12 is used to send the pressure value of the pressure gauge, the humidity value of the blade cavity, the operating status parameters of the second blower and the humidifier to the remote monitoring center 15 through the fan data line, and receive the command of the remote monitoring center 15 and transmit it to the deicing hub control cabinet 10;

[0069] The outlet of the second blower 6 is connected to the outlet of the humidifier 8, the second blower 6 is electrically connected to the pressurization control system and the deicing power distribution box 11, and the humidifier 8 is electrically connected to the humidification control system and the deicing power distribution box 11. The pressurization control system controls the action of the second blower 6, and the humidification control system controls the action of the humidifier 8. The deicing hub control cabinet 10 collects the pressure gauge pressure value, the blade cavity humidity value, and the operating status parameters of the second blower and the humidifier and uploads them to the deicing main control cabinet 12. The deicing main control cabinet 12 sends the received pressure gauge pressure value, blade cavity humidity value, and the operating status parameters of the second blower and the humidifier to the remote monitoring center through the fan data line. The remote monitoring center issues an action instruction to the deicing main control cabinet according to the received pressure gauge pressure value, blade cavity humidity value, and the operating status parameters of the second blower and the humidifier, and the deicing main control cabinet then transmits the action instruction to the pressurization control system and the humidification control system of the deicing hub control cabinet.

[0070] A pressure relief valve 3 is also installed on the manhole baffle 2 at the root 4 of the wind turbine blade 1. In this embodiment, the pressure relief valve 3 adopts a mechanical pressure relief valve, which has a pressure relief valve opening threshold. When the pressure reaches the pressure relief valve opening threshold, it automatically opens, and when it is less than the pressure relief valve opening threshold, it automatically closes. In other words, when the inner cavity pressure of the blade is greater than or equal to the pressure relief valve opening threshold (maximum safe bearing pressure), the pressure relief valve 3 opens, and at the same time the second blower 6 and the humidifier 8 are turned off, and the inner cavity of the blade is depressurized; when the inner cavity pressure of the blade is less than the pressure relief valve opening threshold, the pressure relief valve 3 is closed.

[0071] like Figure 7 As shown, in the above embodiment, the humidifier 8 can be replaced by a hydrogenator, the humidity sensor 7 can be correspondingly replaced by a hydrogen concentration sensor, the humidification control system is replaced by a hydrogenation control system for controlling the hydrogenator, and the operating state of the humidifier is replaced by the operating state of the hydrogenator, so that hydrogen can be filled into the inner cavity of the blade to increase the specific heat capacity of the air in the inner cavity of the blade.

[0072] The specific implementation of the enhanced air-heat deicing method for fan blades of the present invention includes:

[0073] 1. A second blower 6, a humidifier 8 or a hydrogenator is installed on the outer surface of the manhole baffle 2 at the root 4 of each wind turbine blade 1;

[0074] 2. The outlet of the humidifier 8 or the hydrogenator is connected to the outlet of the second blower 6 through a pipeline. The outlet of the humidifier 8 and the outlet of the second blower 6 are also equipped with a one-way valve 9 to facilitate control;

[0075] 3. Install the second blower 6 and the humidifier 8 or the base of the hydrogenator by hand on the inner surface of the blade root 4, and connect the common outlet flange of the two to the flange installed on the manhole baffle 2 with screws;

[0076] 4. Install a pressure gauge 5 on the manhole baffle 2 to measure the air pressure in the blade cavity in real time;

[0077] 5. A humidity sensor 7 or a hydrogen concentration sensor is installed on the manhole baffle 2 to measure the air humidity or hydrogen concentration in the blade cavity in real time;

[0078] 6. Install a pressure relief valve 3 on the manhole baffle 2. When the air pressure in the blade cavity is greater than or equal to the pressure relief valve opening threshold (maximum safe bearing pressure), the pressure relief valve 3 opens, and the second blower 6 and the humidifier 8 are turned off, and the pressure in the blade cavity is relieved; when the pressure in the blade cavity is less than the pressure relief valve opening threshold, the pressure relief valve 3 is closed. The function of the pressure relief valve 3 is to prevent the pressure in the blade cavity from being too high, the blade surface from being deformed too much, and the blade from being damaged;

[0079] 7. Modify the de-icing hub control cabinet 10 installed in the fan hub and add a pressurization and humidification control system (or hydrogenation control system) for three blades;

[0080] 8. Modify the de-icing power distribution box 11 installed in the fan hub and add power supply lines for the second blower 6, humidifier 8 or hydrogenator on the three blades;

[0081] 9. Install a monitoring circuit between the de-icing hub control cabinet 10 and the pressure gauge 5, the humidity sensor 7 or the hydrogen concentration sensor to collect the pressure value of the pressure gauge 5, the humidity value or the hydrogen concentration value of the blade cavity, the state of the pressure relief valve, and the operating state of the first and second blowers and the humidifier or the hydrogenator;

[0082] 10. Install a de-icing main control cabinet 12 in the engine room, send the pressure gauge pressure value, the humidity value or hydrogen concentration value in the blade, the pressure relief valve status, the operating status of the first and second blowers and the humidifier or hydrogenator and other parameters uploaded by the de-icing hub control cabinet 10 to the remote monitoring center 15 through the fan data line, and transmit the instructions of the remote monitoring center 15 to the de-icing hub control cabinet 10;

[0083] 11. Operation logic:

[0084] A. When the anti-icing system is equipped with a humidifier 8, the operation logic of the present invention is:

[0085] (1) Before the cold wave arrives, the anti-icing system of the blades is turned on. First, the first blower 14 and the heater 13 are started to perform air-heat deicing. At the same time, the second blower 6 and the humidifier 8 are turned on. According to the signal fed back by the pressure gauge 5, when the air pressure value in the blade cavity is greater than or equal to the first set pressure value, the second blower 6 is stopped; when the air pressure in the blade cavity is less than the second set pressure value, the second blower 6 is restarted (the first set pressure value is greater than the second set pressure value. The first and second set pressure values ​​are designed to avoid starting the second blower when the pressure in the blade cavity is large and to prevent the second blower from being started repeatedly); when the humidity value detected by the humidity sensor 7 is greater than or equal to the first set humidity value, the humidifier 8 is stopped; when the humidity value detected by the humidity sensor 7 is less than the second set humidity value, the humidifier 8 is turned on (the first set humidity value is greater than the second set humidity value. The first and second set humidity values ​​are designed to avoid starting the humidifier when the humidity in the blade cavity is large and to prevent the humidifier from being started repeatedly);

[0086] (2) When the gas-heat deicing system turns off the anti-icing and deicing modes, turn off the power of the second blower 6 and the humidifier 8.

[0087] B. When the anti-icing system is equipped with a hydrogenator, the operating logic of the present invention is:

[0088] (1) Before the cold wave arrives, the blade anti-icing system is turned on. First, the first blower 14 and the heater 13 are started to perform gas-heat deicing. At the same time, the second blower 6 and the hydrogenator are turned on. According to the signal fed back by the pressure gauge 5, when the air pressure value in the blade cavity is greater than or equal to the first set pressure value, the second blower 6 is stopped; when the air pressure in the blade cavity is less than the second set pressure value, the second blower 6 is restarted (the first set pressure value is greater than the second set pressure value. The first and second set pressure values ​​are designed to avoid starting the second blower when the pressure in the blade cavity is large and to prevent the second blower from being started repeatedly); when the hydrogen concentration value detected by the hydrogen concentration sensor is greater than or equal to the first set concentration value, the hydrogenator is stopped; when the hydrogen concentration value detected by the hydrogen concentration sensor is less than the second set concentration value, the hydrogenator is turned on (the first set concentration value is greater than the second set concentration value. The first and second set concentration values ​​are designed to avoid starting the hydrogenator when the hydrogen concentration in the blade cavity is large and to prevent the hydrogenator from being started repeatedly);

[0089] (2) When the gas thermal deicing system turns off the anti-icing and deicing modes, turn off the power to the second blower 6 and the hydrogen refueling machine.

[0090] 12. Considering the installation position limitation, cable twist prevention during pitch change and other factors, the second blower 6 and the humidifier 8 or hydrogenator can also be installed inside the blades or other places of the fan.

[0091] The above is only a specific implementation scheme of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the art can make many possible changes and modifications to the technical scheme of the present invention by using the technical content disclosed above without departing from the scope of the technical scheme of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical scheme of the present invention should fall within the protection scope of the technical scheme of the present invention.

Claims

1. An enhanced fan blade air-heat deicing system, comprising a heater for heating the air in the inner cavity of the fan blade and a first blower for delivering the heated air in the inner cavity of the blade, characterized in that Also includes: a second blower for providing pressurized air to the inner cavity of the blade; Humidifiers, used to increase the humidity of pressurized air; A pressure gauge is used to measure the air pressure inside the blade cavity in real time; Humidity sensor, used to measure the air humidity in the blade cavity in real time; a de-icing hub control cabinet, comprising a pressurization control system for controlling the second blower, a humidification control system for controlling the humidifier, and a signal acquisition system for collecting and transmitting pressure values ​​of a pressure gauge, humidity values ​​of the blade cavity, and operating states of the second blower and the humidifier to a de-icing main control cabinet; De-icing power distribution box, supplying power to the first blower, the second blower and the humidifier; The de-icing main control cabinet is used to send the pressure value of the pressure gauge, the humidity value of the blade cavity, the operating status parameters of the second blower and the humidifier to the remote monitoring center through the fan data line, and transmit the instructions of the remote monitoring center to the de-icing hub control cabinet; The outlet of the second blower is connected to the outlet of the humidifier, the second blower is electrically connected to the pressurization control system and the de-icing power distribution box, the humidifier is electrically connected to the humidification control system and the de-icing power distribution box, the pressurization control system controls the action of the second blower, the humidification control system controls the action of the humidifier, the signal acquisition system collects the pressure value of the pressure gauge, the humidity value of the blade cavity, the operating status parameters of the second blower and the humidifier and uploads them to the de-icing main control cabinet, the de-icing main control cabinet sends the received pressure value of the pressure gauge, the humidity value of the blade cavity, the operating status parameters of the second blower and the humidifier to the remote monitoring center through the fan data line, the remote monitoring center issues an action instruction to the de-icing main control cabinet according to the received pressure value of the pressure gauge, the humidity value of the blade cavity, the operating status parameters of the second blower and the humidifier, and the de-icing main control cabinet transmits the action instruction to the pressurization control system and the humidification control system of the de-icing hub control cabinet.

2. The enhanced fan blade air-heat deicing system according to claim 1, characterized in that: A pressure relief valve is installed on the fan blade. When the inner cavity pressure of the blade is greater than or equal to the opening threshold of the pressure relief valve, the pressure relief valve opens, and the second blower and the humidifier are turned off at the same time, and the inner cavity of the blade is depressurized; when the inner cavity pressure of the blade is less than the opening threshold of the pressure relief valve, the pressure relief valve closes.

3. The enhanced fan blade air-heat deicing system according to claim 2, characterized in that: The second blower, humidifier and pressure relief valve are installed on the manhole baffle at the root of the fan blade, and the pressure gauge and humidity sensor are installed on the manhole baffle at the root of the fan blade or inside the blade.

4. An enhanced fan blade air-heat deicing system, comprising a heater for heating the air in the inner cavity of the fan blade and a first blower for delivering the heated air in the inner cavity of the blade, characterized in that Also includes: a second blower for providing pressurized air to the inner cavity of the blade; A hydrogenator is used to inject hydrogen into the inner cavity of the blade to increase the specific heat capacity of the air in the inner cavity of the blade; A pressure gauge is used to measure the air pressure inside the blade cavity in real time; A hydrogen concentration sensor is used to measure the hydrogen concentration in the blade cavity in real time; A de-icing hub control cabinet, including a pressurization control system for controlling the second blower, a hydrogenation control system for controlling the hydrogenation machine, and a signal acquisition system for collecting and transmitting pressure values ​​of a pressure gauge, hydrogen concentration values ​​in the blade cavity, and operating states of the second blower and the hydrogenation machine to a de-icing main control cabinet; De-icing power distribution box, supplying power to the first blower, the second blower and the hydrogenator; The de-icing main control cabinet is used to send the pressure value of the pressure gauge, the hydrogen concentration value in the blade cavity, the operating status parameters of the second blower and the hydrogenator to the remote monitoring center through the blower data line, and transmit the instructions of the remote monitoring center to the de-icing hub control cabinet; The outlet of the second blower is connected to the outlet of the hydrogenator, the second blower is electrically connected to the pressurization control system and the deicing power distribution box, the hydrogenator is electrically connected to the hydrogenation control system and the deicing power distribution box, the pressurization control system controls the action of the second blower, the hydrogenation control system controls the action of the hydrogenator, the signal acquisition system collects the pressure value of the pressure gauge, the hydrogen concentration value in the blade cavity, the operating status parameters of the second blower and the hydrogenator and uploads them to the deicing main control cabinet, the deicing main control cabinet sends the received pressure value of the pressure gauge, the hydrogen concentration value in the blade cavity, the operating status parameters of the second blower and the hydrogenator to the remote monitoring center through the blower data line, the remote monitoring center issues an action instruction to the deicing main control cabinet according to the received pressure value of the pressure gauge, the hydrogen concentration value in the blade cavity, the operating status parameters of the second blower and the hydrogenator, and the deicing main control cabinet then transmits the action instruction to the pressurization control system and the hydrogenation control system of the deicing hub control cabinet.

5. The enhanced fan blade air-heat deicing system according to claim 4, characterized in that: A pressure relief valve is installed on the fan blade. When the inner cavity pressure of the blade is greater than or equal to the opening threshold of the pressure relief valve, the pressure relief valve opens, and the second blower and the hydrogenator are turned off at the same time, and the inner cavity of the blade is depressurized; when the inner cavity pressure of the blade is less than the opening threshold of the pressure relief valve, the pressure relief valve closes.

6. The enhanced fan blade air-heat deicing system according to claim 5, characterized in that: The second blower, hydrogenator and pressure relief valve are installed on the manhole baffle at the root of the fan blade, and the pressure gauge and hydrogen concentration sensor are installed on the manhole baffle at the root of the fan blade or inside the blade.

7. A method for deicing fan blades using the enhanced air-heat deicing system according to any one of claims 1 to 3, characterized in that: During anti-icing or de-icing, the second blower and humidifier are turned on. When the blade cavity pressure value detected by the pressure gauge is greater than or equal to the first set pressure value, the second blower is stopped; when the blade cavity pressure value detected by the pressure gauge is less than the second set pressure value, the second blower is turned on; when the humidity value detected by the humidity sensor is greater than or equal to the first set humidity value, the humidifier is stopped; When the humidity value detected by the humidity sensor is less than the second set humidity value, the humidifier is turned on; When anti-icing or de-icing is completed, turn off the power supply of the second blower and humidifier.

8. A method for deicing fan blades using the enhanced air-heat deicing system according to any one of claims 4 to 6, characterized in that: During anti-icing or de-icing, the second blower and the hydrogenator are turned on. When the pressure value of the blade cavity detected by the pressure gauge is greater than or equal to the first set pressure value, the second blower is stopped; when the pressure value of the blade cavity detected by the pressure gauge is less than the second set pressure value, the second blower is turned on; when the hydrogen concentration value detected by the hydrogen concentration sensor is greater than or equal to the first set concentration value, the hydrogenator is stopped; when the hydrogen concentration value detected by the hydrogen concentration sensor is less than the second set concentration value, the hydrogenator is turned on; When anti-icing or de-icing is completed, turn off the power supply of the second blower and hydrogenator.

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