33results about How to "Reduce the risk of freezing" patented technology

The invention relates to a fuel cell system and a shutdown purging method thereof. The system comprises a galvanic pile, an air supply subsystem connected with a cathode of the galvanic pile, a hydrogen supply subsystem connected with an anode of the galvanic pile, a cooling circulation subsystem connected with the galvanic pile, a hydrogen/air mixing box respectively connected with the air supply subsystem and the hydrogen supply subsystem and a controller used for controlling the subsystems. The output end of the galvanic pile is connected with the driving motor by being connected with the DC/DC converter, and after the controller receives a shutdown command, in the fuel cell system shutdown process, the controller controls the temperature of the galvanic pile according to the cooling circulation subsystem and controls the actuator to correspondingly purge the interior of the galvanic pile. The method has the advantages of improving the cold start capability of the fuel cell galvanic pile at low temperature, effectively prolonging the service life of the fuel cell galvanic pile and the like.

The invention relates to an automatic anti-freezing device for a power station direct air cooling unit based on a louver wind shield. The automatic anti-freezing device comprises temperature-measuringcables, temperature measuring points, a data monitoring and processing unit, an automatic executing mechanism and the louver wind shield. The louver wind shield is mounted at an air inlet of an air cooling fan. The multiple temperature-measuring cables are arranged on the air outlet face sides of fin radiating tube bundles, each temperature-measuring cable is internally provided with the three corresponding temperature measuring points at equal distances and connected with an input channel of the data monitoring and processing unit. When the displayed temperature of any one of the temperaturemeasuring points is excessively low, the data monitoring and processing unit judges the specific position immediately, the automatic executing mechanism closes the louver wind shield of a corresponding air cooling unit body, and thus cold air is cut off. The automatic anti-freezing device has the advantages of simple structure, low cost, short stroke time and significant air-blocking effect, theproblem that the fin radiating tube bundles of an air cooling island are frozen in winter can be effectively solved, the back pressure in winter can be reduced by about one KPa, and the heat economy of the unit is improved by 1%-2%.

The invention discloses a control method and a control device of a windscreen wiper, and a vehicle. The method comprises the steps that gear information of the vehicle and environmental information are acquired; a door lock control signal is received; and according to the gear information, the environmental information and the door lock control signal, a working state of the windscreen wiper can be controlled automatically. In this way, freezing risks of the windscreen wiper can be reduced effectively; a user's use demands can be satisfied; and the user's use experience can be improved.

The invention discloses a pipeline passive zero energy consumption freeze-proofing device based on PCM. The pipeline passive zero energy consumption freeze-proofing device based on PCM comprises a work pipe, an erosion resistant coating, a PCM layer, an embedded support, a case pipe and a heat insulation layer. The work pipe (1) is located on the innermost side; the erosion resistant coating is located on the outer side of the work pipe (1); the PCM layer (3) is located in a cavity structure between the erosion resistant layer (2) and the case pipe (5); the embedded support (4) is also locatedbetween the erosion resistant layer (2) and the case pipe (5); and the heat insulation layer (6) is attached to the outer side of the case pipe (5) and serves as the outermost layer structure. The PCM layer (3) is filled with a phase-change medium which is liquid at the room temperature; the embedded support (4) used for fixing the cavity structure between the erosion resistant coating (2) and the case pipe (5) are of a branch-shaped structure; and the case pipe (5) and the erosion resistant coating (2) provide a containing cavity for the PCM layer (3) together. The pipeline passive zero energy consumption freeze-proofing device based on PCM can achieve the technical purposes that no power facility or energy consumption is needed, the structure is simple, implementation is easy, operationand maintenance are convenient, and the requirements for energy conservation and environment protection are met.

The invention discloses a single-phase fluid tube-plate heat absorber loop. Each tube plate is composed of a lower header (1), an upper header (2) and heat absorbing tubes (3). The tops of the heat absorbing tubes (3) communicate with the upper header (2), and the bottoms of the heat absorbing tubes (3) communicate with the lower header (1). The plurality of heat absorbing tubes (3) are arranged in parallel on the same plane and are located in the middles of the tube plates. The heat absorber loop is formed by parallel arrangement of the plurality of tube plates, and connecting pipelines (5) with second check valves (4') and common connecting pipelines (6) are used for communicating the adjacent tube plates and are mounted between the lower headers (1) and between the upper headers (2) of the adjacent tube plates. Valves (7) are mounted on a main inflow pipeline (8), a main outflow pipeline (9) and auxiliary pipelines (10) which are connected with the heat absorber loop.

The invention belongs to the field of power station air cooling technology optimization, and particularly relates to an underground air inlet system of an indirect air cooling tower for restraining adverse influence of environmental wind. The system comprises an air cooling tower cylinder, supporting columns of the air cooling tower cylinder, an air cooling radiator, a chimney, a desulfurizing tower, a cover plate, a circular-truncated-cone-shaped underground air inlet channel, a flow guide plate, a drainage ditch and an earth surface plane. The air cooling tower cylinder is supported on the lower bottom surface of the circular-truncated-cone-shaped underground air inlet channel through the supporting columns; the chimney, the desulfurizing tower and the air cooling radiator are all arranged on the lower bottom surface of the circular-truncated-cone-shaped underground air inlet channel; the whole air cooling tower cylinder is located above the earth surface plane; the whole air cooling radiator is located below the earth surface plane; the cover plate and the earth surface plane are on the same horizontal plane and are hermetically connected with the bottom of the air cooling tower cylinder; and an annular inlet plane formed by the circular-truncated-cone-shaped underground air inlet channel and the cover plate is an air inlet of the underground air inlet system. According to the underground air inlet system of the indirect air cooling tower for restraining the adverse influence of the environmental wind, the negative influence of environmental wind on the cooling performance of the air cooling radiator can be restrained, and the summer-keeping and anti-freezing performance of the indirect air cooling system is improved.

The invention discloses an anti-lightning and anti-freezing system having a safety early-warning function and used for a water tank. The system comprises the water tank, a heat insulating layer, a metal net layer, an insulating protection layer, a grounding wire, a grounding device, a water tank water outlet, a water pipe, a water pipe water outlet, a solenoid valve, leads, an anti-lightning module and a warning device, wherein the outer side of the water tank is covered with the heat insulating layer, the outer side of the heat insulating layer is covered with the metal net layer, the outer side of the metal net layer is covered with the insulating protection layer, the grounding device is connected with the metal net layer through the grounding wire, the water pipe is connected with the water tank water outlet, the solenoid valve is arranged on the water pipe, the anti-lightning module is connected with the metal net layer and the solenoid valve through the leads, and the warning device is integrally connected with the anti-lightning module. The anti-lightning and anti-freezing system has the early-warning function and can improve the resident use safety of the anti-lightning and anti-freezing roof water tank.

The invention discloses an equipment passive zero energy consumption freeze-proofing device based on PCM. The equipment passive zero energy consumption freeze-proofing device based on PCM comprises anequipment shell, an embedded support, a PCM layer, an inner protection layer, a heat insulation layer, an outer protection layer and fireproof paint. The equipment shell (1) is located on the innermost side; a liquid phase-change material of the PCM layer (2) is contained in a cavity structure between the equipment shell (1) and the inner protection layer (4); the embedded support (3) is locatedbetween the equipment shell (1) and the inner protection layer (4), and a cavity structure is formed; the heat insulation layer (5) is attached to the outer side of the protection layer (4), and the inner protection layer (4) provides supporting for the heat insulation layer (5); the outer protection layer (6) is fixed to the outer side of the heat insulation layer (5); the fireproof paint (7) coats the outer side of the outer protection layer (6); and the PCM layer (2) is filled with a phase-change material which is liquid at the room temperature. The equipment passive zero energy consumptionfreeze-proofing device based on PCM achieves the technical purpose that freeze-proofing protection can be carried out on equipment under the premise of no power facility or energy consumption; and meanwhile achieves the technical purposes that the equipment structure is simple, implementation is easy, operation and maintenance are convenient, and the requirements for energy conservation and environment protection are met.

The invention relates to a control device (10) for an internal combustion engine, comprising an exhaust gas recirculation channel (18), an air suction channel (14) into which the exhaust gas recirculation channel (18) enters, a valve seat (34) embodied on a mouth (30) at the end of the exhaust gas recirculation channel (18), and a valve disk (58) that can be placed on the valve seat (34) by meansof an actuator such that the mouth (30) of the exhaust gas recirculation channel (18) can be closed. The valve seat (34) and/or the valve disk (58) form an at least single-curved concave surface (64,74), and the valve disk (58) is elastic.

The invention discloses a temperature control method of an air cooling condenser, and belongs to the field of condenser freezing prevention. According to the temperature control method provided by theinvention, air regulating devices of a plurality of cooling triangular units distributed on the 1/6-1/8 circumference of the windward side and the circumference circumference which is in central symmetry with the windward side are closed one by one according to the influence of the ambient wind on the heat dissipating capacity of air-cooled condenser at different positions around a tower when thetemperature of a condensation water pipe is lower than a set value, and steam inlet pipe valves of the cooling triangle units are closed, so that the temperature of condensation water can be rapidlyincreased, the heat dissipation amount of a heat dissipation unit is balanced, and the freezing risk is reduced; and when the temperature of the condensation water pipe of the air cooling condenser ishigher than a set value, the steam inlet pipe valves of a group of cooling triangle units distributed on the windward side and the circumference which is in central symmetry with the windward side are opened one by one, and then the opening degree of the air adjusting devices corresponding to the cooling triangle units is gradually increased until all the cooling triangle units are put into operation according to the steps or the temperature of the condensation water pipe is lower than the set value, the condensation water temperature is stably reduced.

The invention discloses a method for recovery of ethane from carbon dioxide-containing natural gas. On the basis of expander refrigeration-partial dry gas circulation process, the absorption principleof propane and butane based liquid hydrocarbon to CO2 is applied in a low temperature separation process, part of feed gas and part of the liquid phase in a low temperature separator are mixed and undercooled to enter the middle-upper part of a demethanation tower, part of outward transportation gas flows back and is mixed with part of the liquid phase in the low temperature separator, then the mixture enters the top of the demethanation tower after undercooling, thus increasing the content of propane and butane based liquid hydrocarbon at the middle-upper part of the demethanation tower, lowering the concentration of CO2 in a demethanation tower tray gas phase, and strengthening the ability of an ethane recovery device in inhibiting CO2 solid formation. At the same time, the method increases the cooling capacity at the middle-upper part of the demethanation tower, and enhances the ethane recovery rate. The method strengthens the ability of the demethanation tower in inhibiting CO2 solid formation, also increases the ethane recovery rate, effectively improves the economic benefits of the ethane recovery device operation, and is suitable for ethane recovery devices with a feed gasCO2 content greater than 0.5%.