52results about How to "Reduced risk of icing" patented technology

The invention discloses a counter-flow closed-type cooling tower, belongs to heat exchanging equipment, particularly relates to a closed-type cooling tower which is used for preventing fogging at an air outlet, and aims to provide a counter-flow closed-type cooling tower which, during winter operation, can alleviate or eliminate fogging at the air outlet and reduce the risk of ice formation at shutters of the air outlet, and is convenient to save water. The counter-flow closed-type cooling tower comprises a tower body (1), a blower (2), a water collector (3), a water distributing device, a first heat exchanger (5), filling (6), a water collecting groove (7), air inlet shutters (8), a second heat exchanger (9), and a main water collecting pipe (42), wherein the water distributing device comprises a plurality of water distributing pipes (41); all the water distributing pipes are distributed in the tower from the middle to two sides in parallel to one another, or are distributed in the tower from the center to the periphery; a plurality of water distributing nozzles (411) are arranged on the side wall below the water distributing pipes; each water distributing pipes is connected with the main water collecting pipe through a flow rate adjustable valve (4).

The invention provides a shutdown purging method of a vehicle-mounted fuel cell, belongs to the technical field of shutdown purging of fuel cell stacks, and solves the problem that modal water in a proton exchange membrane cannot be effectively eliminated in the prior art. The method comprises the steps of acquiring an impedance range when the water content of the fuel cell is lower than a preset value at different environment temperatures; after a whole vehicle shutdown instruction sent by a user is received, monitoring the environment temperature at the current moment, and recognizing the impedance range when the water content, which corresponds to the environment temperature, of the fuel cell is lower than a preset value; performing first purging on the fuel cell stack, monitoring the real-time high-frequency impedance of the stack in the purging process, stopping purging until the real-time high-frequency impedance falls into the recognized impedance range, and obtaining the first purging time; and after the purging is stopped for a preset time, monitoring the environment temperature again, continuously performing purging on the fuel cell stack until the last purging time reaches a specified threshold value, stopping the whole vehicle, and shutting down the fuel cell stack.

The invention relates to the technical field of intelligent household electrical appliance, and discloses a method and device for freezing-prevention protection of an air conditioner and the air conditioner. The method comprises the following steps of obtaining a current coil pipe temperature of the air conditioner; under the condition that the absolute value of the difference value between the current coil pipe temperature and a preset freezing-prevention protection temperature is smaller than the first set value, increasing the wind speed of a fan to a second wind speed from a first wind speed, determining the obtained difference value between the current air returning temperature and the current coil pipe temperature as a first superheat degree and saving the difference value; and underthe condition that the fan runs at the second wind speed, determining the obtained difference value between the current air returning temperature and the current coil pipe temperature as a second superheat degree, under the condition that the absolute value of the superheat difference value between the first superheat degree and the second superheat degree is larger than the second set value, adjusting the preset freezing-prevention protection temperature, and carrying out freezing-prevention protection running according to the adjusted preset freezing-prevention protection temperature. Therefore, accuracy of freezing-prevention protection of the air conditioner can be improved.

The invention provides a fuel cell purging control method and device based on DRT analysis, and the method comprises the steps: carrying out the DRT analysis of an electrochemical impedance spectrum of a fuel cell system in a cold storage state after the fuel cell system is shut down, and obtaining the low-frequency impedance, second intermediate-frequency impedance and second high-frequency impedance of the fuel cell system; correcting the first impedance target value and the second impedance target value according to the low-frequency impedance, the second intermediate-frequency impedance and the second high-frequency impedance, and determining a new first impedance target value and a new second impedance target value; and storing the new first impedance target value and the new second impedance target value, so as to purge the fuel cell system according to the new first impedance target value and the new second impedance target value before the next shutdown, thereby realizing the dynamic closed loop of the cold purge of the fuel cell based on the optimized purge criterion, reducing the freezing risk of cold storage, and improving the reliability of the fuel cell system. Meanwhile, the cold start performance of the stack is improved, and the durability and service life of the fuel cell are improved.

The present invention relates to an arrangement for deicing pipeline connections of an aircraft, which are connected to all fresh air outlets of an air conditioner, whose construction comprises the functions of multiple turbines and heat exchangers, having a first pipeline (1), which is connected to a first turbine (TA), and a second pipeline (2), which is connected to a second turbine (TB), the two pipelines (1, 2), which are each connected downstream from the two turbines (TA, TB) and to which process air is fed at the turbine outlets, being connected at the pipe ends and being continued using a third pipeline (3). The arrangement is characterized in that a first hot air source (11) is fed hot fresh air from a bleed air system of the aircraft and is connected at its outlet to a fourth pipeline (4), into which temperature-reduced fresh air is fed from the hot air source (11). The fourth pipeline (4) is connected at its pipe end to two further valve-regulated pipelines (5,6), of whicha fifth or a sixth pipeline (5, 6) is connected to the first or the second pipeline (1, 2), and through which temperature-reduced fresh air is transported and fed valve-regulated to the first and/or second pipeline (1, 2).

The invention discloses an ultrasonic anti-freezing device of a power transmission tower, comprising a wind generating set, a humidity sensor, a single chip microcomputer control switch and an ultrasonic atomizer, wherein the wind generating set is electrically connected with the ultrasonic atomizer by the single chip microcomputer control switch; the humidity sensor is electrically connected with the single chip microcomputer control switch; the wind generating set comprises a wind generator, a generating control unit and a storage battery; and the generating control unit is respectively and electrically connected with the wind generating set and the storage battery. The ultrasonic anti-freezing device disclosed by the invention has the beneficial effects that (1) the working of a high-altitude wind generating system is relatively stable, and continuous power supply can be provided; and (2) the ultrasonic atomizer is combined with the humidity sensor for use, so that no collection of excessive water on the surface of the power transmission tower is effectively ensured and the icing risk of a steel structure of the power transmission tower is reduced.

The invention discloses an ultralow-temperature-resistant disinfectant, and relates to the technical field of disinfectants. The ultralow-temperature-resistant disinfectant is obtained by mixing and stirring a material A and a solution B. The material A comprises the following components in parts by weight: 10-20 parts of octocapric acid and 10-20 parts of nonanoic acid. The solution B comprises the following components in parts by weight: 30-40 parts of deionized water, 60-70 parts of ethanol and 2-3 parts of a hydrochloric acid solution with the mass percent of 30%. The application has the effect of improving the applicability of the disinfectant in an ultralow-temperature environment.

The invention relates to a power grid ice melting decision-making method and device, computer equipment and a medium, and the method comprises the steps: obtaining first icing risk parameters of M substations, obtaining N second icing risk parameters and N target icing risk parameters corresponding to each substation, and generating a target risk matrix according to the target icing risk parameter, obtaining a decision-making matrix according to the target risk matrix, the target function and the constraint condition, and allocating an ice melting device to the transformer substation accordingto the decision-making matrix. Because the target icing risk parameter represents the icing risk which can be reduced when the ice melting device is distributed to the transformer substation, the target function indicates that the total ice melting income is maximum, and the decision-making matrix obtained according to the target risk matrix, the target function and the constraint condition is the optimal ice melting decision-making scheme. Therefore, the ice melting equipment is allocated according to the decision matrix to melt ice for the transformer substation, the ice melting efficiencyis improved, and the risk of safe operation of a power grid is reduced.

The invention discloses a system and a method for preventing freezing of a coal-fired wet cooling unit in winter and reducing back pressure of the coal-fired wet cooling unit in summer. The system is characterized in that a new cooling system is connected in parallel in an original cooling system, so that the cooling system of the cooling unit has multiple modes to choose. A new cooling circulation system is mainly added, and a low-power circulating water pump is adopted, so that the cooling water flow is reduced, the lift of the low-power circulating water pump is ensured to be consistent with the lift of an original circulating water pump, and the cooling water temperature is increased; and meanwhile, when the heat load entering a condenser rises, the tower feeding mode is changed, and a cooling tower is fed again. After the system is adopted, the freezing prevention problem can be solved, part of circulating cooling water can enter the mechanical draft cooling tower when the environment temperature and the unit load are high in summer, the water spraying density of an original natural draft cooling tower is reduced, the temperature of water flowing out of the tower is reduced, the back pressure of the unit is reduced, and the economical efficiency of the unit is improved.

The invention discloses a wet cooling tower core component arrangement method for a wind direction stable area. The method comprises the steps that firstly, according to the local wind direction condition, a cooling tower is divided into a wind direction stable area and a windless area, grid encryption processing is conducted on the wind direction stable area so that the process of a key cooling area can be simulated more accurately, numerical simulation is conducted on multiple sets of parameters, and the parameters with the optimal solution are determined to arrange the cooling tower. According to the method, the arrangement mode and number of tower core components are guided and selected through numerical simulation and calculation results in the early stage, the situation that the heat exchange volume of filler is increased on the windward side is mainly considered, water distribution is enhanced, and the cooling effect of the windward side is enhanced.