611results about How to "Enhanced convective heat transfer" patented technology

An improved heat exchanger design is disclosed. The design of the heat exchanger provides for a safe separation of the flow streams even in the event of leakage. An improved heat recovery device for use in the drain conduit of standard shower installations, comprising the heat exchanger of the invention, is also disclosed.

The invention discloses inorganic composite thermal mortar, which comprises ordinary Portland cement, coal ash, glass beads, expanded perlite, polypropylene fibers, heavy calcium powder, ash calcium powder, mineral fibers and a composite additive. By adopting the invention, fireproof insulation layers are constructed on the wall space and the top surface of the building effectively, the heat insulation property of the building is greatly improved, energy consumption for heating in winter and cooling in summer is reduced, and the inorganic composite thermal mortar has the advantages of light density, small heat conductivity coefficient, high temperature resistance, fire resistance, safety use, environmental friendliness and durability. The inorganic composite thermal mortar is suitable for thermal insulation construction of wall spaces and roofs, such as reinforced concrete, concrete, aerated concrete blocks, clay bricks, steel structures and the like, and is also suitable for construction of fireproof insulation layers, such as underground garage, elevator wells, tube wells, cold storages and the like.

The invention discloses a high-efficiency solar phase-change heat-accumulation heat-collection wall system, which belongs to the technical field of a heat-accumulation heat-collection building utilizing solar energy. A phase-change material plate is attached to the surface of the wall body of a building in a passage of the solar heat-collection heat-accumulation wall, various vortex generators are arranged at the surface of the phase-change material plate at a certain attack angle of incident flow by an array mode, and vortex is induced to thin and destroy a boundary layer clinging to the wall surface or increase the turbulence intensity so as to reinforce the heat exchange of air at the surface and the phase-change material plate and enhance the heat-accumulation/heat-release rate of the phase-change material, thereby enhancing the efficacy of the solar phase-change heat-accumulation heat-collection wall system. Openings at the top end and the bottom of the passage are respectively communicated with a room of the building and an outdoor space, different operation strategies are respectively adopted in winter and summer, and heat is supplied to an indoor space in winter; and hot air in the passage is exhausted in summer, and the comfort level of the indoor space is enhanced. The solar heat-collection heat-accumulation wall has the characteristics of simple manufacture and convenient installation and has extensive application prospect and popularization value in a solar building.

The invention aims to provide a long-term efficient passive containment cooling system utilizing a jetting technique. A built-in heat exchanger of a containment and upper and lower pipe sections form a first-stage heat discharging system; an air cooler, a water tank baffle plate and a steam-air jet device in an external water tank form a second-stage heat discharging system of a cooling system; the steam-air jet device is located on the side wall surface of a gas space in the water tank and is used for introducing water steam produced by virtue of the first-stage heat discharging system into an ejector to jet air of the second-stage heat discharging system, so as to decrease the inlet temperature of the first-stage heat discharging system, so that the heat discharging efficiency of the system is improved; and a passive containment heat exchanger adopts an intensified heat exchange pipe and is located in the containment, the heat exchange pipe adopts a small-coil-pipe light pipe, and drainage plates are mounted on the periphery of the heat exchanger. According to the long-term efficient passive containment cooling system, when a crevasse accident occurs at a main cooling agent loop or a main steam pipeline, the internal heat in the containment can be efficiently taken away in a long term, so that the internal temperature and pressure of the containment can be below safety limit values for a long time under accident conditions.

The invention discloses a reentry type compound cooling structure which comprises an external wall, a middle wall, an internal wall and end walls. The back segment of the external wall is provided with an impact opening; a cooling air slot with certain interval is formed between the middle wall and the front end wall; the internal wall is a cooling structure of a multi-inclined-hole wall, and cooling air flows in a reentry way among the walls of three layers. An impact flow mode is adopted for cooling air. The air flows from back to front in an upper cooling channel composed of the external wall and the middle wall. The heat exchange efficiency of the front segment of the middle wall can be effectively improved by the function of bytyl cellular pits on the middle wall. The air enters a lower cooling channel from the cooling air slot, flows in the reentry way and flows out of the internal wall from a shrinkable and expandable air film hole, and the air film protection is formed at the hot lateral of the internal wall. The shrinking air intake of the shrinkable and expandable air film hole can effectively improve the convective heat transfer of the internal wall of the shrinkable and expandable air film hole, and the expanding gassing can lower the penetration capability of jet flows, strengthen the cover effect of the air film on the hot lateral of the internal wall and effectively protect flame tubes. The cooling structure has the advantages of simple structure, convenient manufacturing and convenient popularization and application.

The invention provides a new method for preparing aluminium alloy plates and strips for deep drawing, in particular to a multiple-energy-field asymmetric sunken type cast-rolling method. The method comprises the steps of leading a refined aluminium alloy melt into a roller gap of a cast-rolling mill having electromagnetic/ultrasonic composite energy fields through asymmetric casting nozzles which are installed in a sunken mode, under the effects of stirring and vibrating impacting of the electromagnetic/ultrasonic composite energy fields, climbing, returning and stirring of the aluminium melt in a cast-rolling area and forced cooling and rolling deformation of rollers, strengthening heat transfer, mass transfer and energy conversion of the cast-rolling area, achieving crystal nucleus propagation, and changing solidification behavior, so that the aluminium alloy plates and strips are produced through cast-rolling continuously. The aluminium alloy plates and strips prepared by the method are bright and clean in plate surface, neat in edge, small and uniform in grain, low in anisotropism and excellent in deep drawing performance, and the method is short in whole production flow, high in efficiency, low in product cost, high in product quality and applicable to batch production of the aluminium alloy plates and strips for the deep drawing.

The invention discloses a gas turbine cooling blade with a crown. A plurality of clapboards which are arranged along the radial direction respectively are arranged from the leading edge of a blade body to the tail edge on the inner wall of the blade body; the inner cavity of the blade body is divided into three return flow type cooling channels which are formed along the longitudinal direction of the blade body; a clapboard at the headmost end is provided with impingement cooling holes, and the leading edge of the blade body is provided with air film holes; the tail end of a cooling channel on the middle part of the blade body is connected with a blade crown cooling cavity; partition ribs and turbulent flow posts are arranged and air vent holes are formed in the blade crown cooling cavity; an air vent seam is formed at the tail edge of the blade; and the turbulent flow posts are arranged in the air vent seam. The blade has a simple structure; and by the blade, the cooling efficiency is improved, the temperatures of the blade body and the blade crown are reduced, the loss of air leakage of a blade tip is reduced, and the properties of the turbine blade and the complete machine are improved.

The invention relates to a steam turbine generator provided with an axial-radial ventilating and cooling system, which belongs to the technical field of cooling of a large air-cooling steam turbine generator and aims to improve the heat dissipation capacity of a stator winding of the large air-cooling steam turbine generator. A plurality of non magnetic-conducting distance rings are additionally provided on the basis of the ventilating and cooling system of a traditional steam turbine generator, one non magnetic-conducting distance ring is arranged at a cold air outlet of each radial ventilating duct in a cold air area to realize sealing, four sectionalized baffle plates are arranged on each stator tooth on each intermediate stator core, two axial air holes are arranged on each stator tooth on the intermediate stator core, the axial air holes axially run through along the stator teeth, the two axial air holes are arranged on each stator tooth along the radial direction, the position of each axial air hole on the stator tooth corresponds to the winding position of the stator winding, and two sides of each axial air hole are provided with two sectionalized baffle plates along the peripheral direction of a stator in a mirror symmetrical way. The steam turbine generator provided with the axial-radial ventilating and cooling system is used for cooling the steam turbine generator.

The invention relates to a heat accumulating type double-hearth lime kiln. The heat accumulating type double-hearth lime kiln comprises a feeding system, a discharging system, a combustion system, an air supply system, an exhaust emission system and two kiln bodies arranged in parallel, wherein each kiln body is respectively provided with a feeding port, a preheating zone, a calcining zone, a cooling zone and a discharging port; the two kiln bodies are communicated with each other through an annular channel on the upper parts of the cooling zones; a gas collecting device is arranged on the upper part of the preheating zone; an inserting type burner is arranged on the calcining zone; a cooled air inlet is formed in the cooling zone; a high-temperature calcining zone is arranged between the calcining zone and the cooling zone; the high-temperature calcining zone is provided with a fuel gas heat accumulator or 1 to 5 rows of fuel gas heat accumulating burners and 1 to 5 rows of combustion-supporting gas heat accumulating burners; and the fuel gas heat accumulating burners and the combustion-supporting gas heat accumulating burners are arranged at intervals and annularly arranged at the periphery of the kiln wall. The high-temperature calcining zone performs calcination in a secondary combustion manner, so that sulfur content of the calcined product is reduced and the quality of the calcined product is improved. The high-temperature calcining zone adopts the heat accumulating burners and utilizes oxygen for supporting combustion, thereby facilitating the improvement on intensity of combustion and reducing the energy consumption.

The invention relates to a disc type motor of an integral cooling heat radiation structure. The disc type motor is an axial flux motor, and uses a double-stator and single-rotor structure. The disc type motor comprises an enclosure assembly, wherein a rotor assembly is used for fixing a non-driving end stator assembly and a driving end stator assembly onto the enclosure assembly; the rotor assembly is positioned between the non-driving end stator assembly and the driving end stator assembly; a rotary transformer assembly is fixed on the non-driving end stator assembly; and an outlet box assembly is directly welded onto the enclosure assembly. By using the measures that an iron core is prepared from ultra-thin silicon steel sheets so as to reduce iron consumption, magnetic steel uses an epoxy cladding material to block eddy currents so as to reduce the eddy-current loss, a stator winding uses a thin enameled wire to reduce high-frequency eddy-current copper loss and the like, end cover water channels on two sides of the disc type motor, an inner water jacket and an enclosure water channel are combined and integrally designed, so that the heat convection capacity of the motor system is improved; the disc type motor has the advantages of high overload capacity, compact structure, high power factor, great power density, wide speed adjustable range and the like, and is suitable for serving as power of pure electric vehicles and hybrid electric vehicles.

The invention provides a high-adjustment-ratio water-cooling premixed combustion high-strength heat exchange gas condensation boiler. The high-adjustment-ratio water-cooling premixed combustion high-strength heat exchange gas condensation boiler comprises a combustor and a heat exchanger, wherein the full-premixed combustor mounted in the center of a boiler top plate consists of a booster fan, a premixing chamber and a water-cooling combustion head; a flame stabilizing pipe and an anti-tempering column of the water-cooling combustion head can realize high-adjustment-ratio water-cooling premixed combustion; the heat exchanger consists of a lap of water-cooling wall and one or more laps of fins uniformly arranged in the peripheral direction by bent edge folding fin pipes; an air blower feedsair into the premixing chamber for fully mixing with gas to enter an inner cavity of a hole plate of the combustion head; the air flows out from a fire hole, and is sprayed out from narrow gaps amongthe water-cooling pipes distributed in the peripheral direction; after the air flows out from the flame stabilizing pipe, the air is ignited to uniformly combust in the peripheral direction and the axial direction, and radiates and releases heat to an inner pipe ring; smoke flushes base pipes and fins of inner and outer ring fin pipes in sequence to reinforce heat exchange; and the smoke downwards flows into a dew bearing disc through gaps between a housing and an outer layer fin pipe, and is exhausted into atmosphere from a smoke outlet. The high-adjustment-ratio water-cooling premixed combustion high-strength heat exchange gas condensation boiler is high in combustion load adjustment ratio, compact in heat exchange, low in nitrogen emission and high in heat efficiency.

A gas furnace external circulation cooling method and a cooling system of a double-chamber constant-pressure quenching furnace belongs to the metal quenching field; aiming at the defects of wasting nitrogen with the prior art, the invention provides a method by which the high-temperature nitrogen is discharged from the top of the quenching furnace to be introduced into a heat exchanger out of the furnace for cooling; and then the nitrogen is mixed with the liquid nitrogen from a liquid nitrogen storage tank to participate in the quenching process and the circulation of the gas out of the furnace; the system which implements the method is that the nitrogen outlet at the top of a cooling chamber is connected with the heat exchanger and the outlet of the heat exchanger is connected with the outlet pipe of the liquid nitrogen storage tank in parallel; the main pipe after the parallel connection is connected with the air intake of a convergent divergent channel which is arranged on the cooling chamber; the outlet of the convergent divergent channel is connected with a nozzle to form a gas circulation cooling system; the inlet of a heat exchanging pipe in the heat exchanger is connected with a water pump or a fan and the inlet of the water pump is connected with a water tank; the inlet of the fan is arranged in the atmosphere to form circulation cooling system; the liquid nitrogen storage tank is connected with the parallel main pipe to form a medium supply system. The invention is characterized by saving nitrogen and high-quality quenching.

A combined circulating fluidized-bed boiler is composed of combustion chamber, cyclone separator, throat, material return valve and air distributing plate, and features that said throat can divide the combustion chamber into several combustion chambers for intensifying the combustion of particles in combustion chamber.

The invention provides a multidirectional corrugated inner finned tube which comprises an outer tube, a plurality of multidirectional corrugated inner fins are uniformly distributed on the inner circumferential face of the outer tube. Each multidirectional corrugated inner fin comprises a root, two straight walls and two bends. Multidirectional corrugated patterns are distributed on the two straight walls, and lines of the multidirectional corrugated patterns on the same straight wall are consistent in tendency. The bends and the inner surface of the outer tube are in a brazing manner. The straight walls extend radially along the outer tube. The outer tube and the multidirectional corrugated inner fins form a plurality of parallel circulating channels. The multidirectional corrugated inner finned tube provided by the invention has various structural patterns and is easy to form and process. Compared with an optical tube, the effective heat transfer area is remarkably increased, so that the flow medium flow pattern in the tube is forcibly guided. The secondary flow is enhanced, the transverse turbulent flow is aggravated, the turbulivity is increased and the boundary layer of a flow medium is strongly interfered, so that the purpose of efficiently enhancing the heat transfer is realized. Meanwhile, the vertical flowing resistance in the tube can be controlled. Compared with the common finned tube, the resistance is remarkably reduced with the same thermal load.

The invention discloses a flue gas and air premixing pipe bundle self-cooling low-nitrogen combustion device and a combustion method thereof. The flue gas and air premixing pipe bundle self-cooling low-nitrogen combustion device comprises a gas pipeline, an air blower and a flue gas and air premixing pipe bundle self-cooling low-nitrogen combustor; a flue gas and air mixing device is connected to an air inlet of the air blower; a flue gas and air mixing pipeline is connected to an air outlet of the air blower; a flue gas and air mixing ejector is connected onto the flue gas and air mixing pipeline; an air sleeve is arranged on the low-nitrogen combustor; a main gas jet pipe is arranged in the air sleeve; a circle of flue gas and air mixing cooling pipe bundle is arranged on the periphery of the main gas jet pipe and directly goes deep into a hearth; a burning torch is arranged on the combustor; a flue gas and air mixing inlet is formed in the air sleeve; the rear end of the main gas jet pipe communicates with a big fire gas pipeline provided with a big fire valve and a small fire gas pipeline provided with a small fire valve; and a flame detector is arranged on the end head of the burning torch. The device is applicable to a gas boiler, has the characteristics of simple structure, reasonable design, flame combustion with low nitrogen at low temperature, capability of automatic cooling, accurate control and the like, and ensures lower nitric oxide emission load of the gas boiler.

A system (30) and method for fluidizing a polymer powder (11) to be sprayed, metering the material (12) and mixing it with a heated carrier-gas stream (13) to produce a spray (32), and using the spray (32) to transport the material (12) to a substrate (34) and radiant an convective heating of the material (12) during transport to achieve melting of the polymer powders (11).

The invention discloses a high-power LED (light emitting diode) grapheme-based heat radiation device, which comprises a base plate, wherein the base plate is pasted on the bottom surface of an LED light source and is used for heat conduction, fins for achieving the heat radiation effect are arranged on the base plate, the bottom surface of the base plate is provided with a single-layer grapheme-based interface, and contact interfaces of the bottom surface of the LED light source and the single-layer grapheme-based interface are filled with composite layers of grapheme and heat conduction bonding agents. The high-power LED grapheme-based heat radiation device has the advantages that the horizontal direction of the single-layer grapheme-based interface has very high heat conductivity, a great amount of concentrated heat can be fast conducted to the base plate and the fins, and through the corrugated design and the reasonable layout of the fins, the convection heat exchange capability of the fins and the air can be improved, so a great amount of concentrated heat is fast conducted out, in addition, the convection heat exchange heat is radiated out, the heat radiation efficiency is high, the heat radiation effect is good, and the temperature of the heat radiation device is uniform.

The invention provides a drying dehumidifier. The drying dehumidifier comprises a compressor, an indoor condenser, an indoor evaporator, a first throttle valve, an outdoor heat exchanger and a control system among which a high-temperature dehumidifying circulation pipeline and a low-temperature dehumidifying circulation pipeline are formed, a controller controls a coolant to circulate in the corresponding circulation pipelines to realize high-temperature dehumidification or low-temperature dehumidification of materials. The drying dehumidifier overcomes the shortcomings that a drying dehumidifying heat pump unit in the prior art only has a high-temperature dehumidifying mode but cannot realize low-temperature dehumidification of the materials.

The invention relates to a suspension body of a hot water circulating pump provided with a groove structure on an inner wall surface. The suspension body comprises a suspension body, a shaft sleeve, a pump spindle, a guide bearing and an annular radiating fin, wherein rectangular grooves which are identical in structure and size are machined on the inner wall surface of the suspension body, heat transfer of fluid in an annular gap formed by the suspension body and the pump spindle is enhanced, the heat of a high-temperature medium is transferred to the ambient environment effectively, the annular radiating fin is arranged on the periphery of the outer wall surface of the suspension body, the heat of the high-temperature medium transmitted to the suspension body is transmitted into the ambient air, and the heat of the high-temperature fluid in a pump body cannot be transmitted to a mechanical seal and a bearing which are arranged behind the pump body, through the suspension body. When the hot water circulating pump works, an impeller operating region with higher temperature and a mechanical seal and bearing working region are separated through the suspension body, so that the heat of the high-temperature medium transmitted to the mechanical seal is insufficient to influence the sealing life, the guide bearing at the front end of the suspension body has a self-lubricating function, and the guide bearing is lubricated by a conveying medium through a groove on the pump spindle. The suspension body, provided by the invention, is used for modifying the conventional hot water circulating pump, thereby realizing air-cooling of the hot water circulating pump.

The invention discloses a built-in spring tubular reactor. A gland of a shell is provided with heat exchange carrier inlet and outlet; the gland is connected with the shell through a flange; the shell is provided with reaction material inlet and outlet; an S-shaped reaction tube, a spring and a baffle plate are arranged inside the shell; the S-shaped reaction tube comprises a horizontal straight pipe and a U-shaped connecting pipe; the horizontal straight pipe is connected with the U-shaped connecting pipe through a pipe flange; the spring is fixed in the horizontal straight pipe; a metal slender rod is embedded into the pipe flange; one end of the S-shaped reaction tube is connected with the reaction material outlet, and the other end of the S-shaped reaction tube is connected with the reaction material inlet. The built-in spring tubular reactor has the advantages that: the built-in spring tubular reactor has temperature conductivity higher than that of the normal tubular reactor, can effectively prevent coalescence of bubbles and formation of plug flow of gas-liquid two-phase section, and can operate reliably for a long term under the condition that fluid gas content is high. Even through under the condition of low mean velocity, the built-in spring tubular reactor also has a good reaction effect. The built-in spring tubular reactor is suitable to be used for generating gas in the reaction process and forming the reaction process of gas-liquid two-phase flow.

The invention discloses a glass tube bundle and porous medium composite structure solar absorber which comprises a solar absorber shell, wherein a quartz glass window is formed in one end of the solar absorber shell, and a medium outlet is formed in the other end of the solar absorber shell; the solar absorber shell and the quartz glass window are connected into a whole, and a cavity is formed between the solar absorber shell and the quartz glass window; glass tube bundles and porous media are sequentially arranged inside the cavity along the solar incident direction; a preheating channel is formed among the solar absorber shell, the glass tube bundles and the porous media; a first medium inlet is formed in one end of the preheating channel; and after preheated in the preheating channel, the media converge sunlight at the second medium inlet so as to enter the glass tube bundles. Because the glass tube bundles are small in solar absorption and small in external radiation energy, the thermal efficiency of the system is improved. Meanwhile, the incident sunlight is transmitted to the porous medium by the glass tube bundles, so that medium distribution is matched with sunlight flow density, while the porous medium is mainly capable of converting solar radiation energy into internal energy of working media; and therefore, the problem that the existing porous medium solar absorber is low in thermal efficiency and reliability is effectively solved.