35results about How to "Increase boiling heat transfer coefficient" patented technology

The invention relates to a medium and low-temperature waste heat driven flat evaporation-injection-absorption combined cycle combined cold-heat power supply system and belongs to the technical field of new energy and energy conservation. The medium and low-temperature waste heat driven flat evaporation-injection-absorption combined cycle combined cold-heat power supply system comprises a superheater, a waste heat heater, a flash evaporator, a rectifier, an expansion machine, a cooling heat exchanger, a booster compressor, an injection ejector, a regenerator, an absorber, an absorption pump, asolution pump, a throttling valve and a stop valve. The medium and low-temperature waste heat driven flat evaporation-injection-absorption combined cycle combined cold-heat power supply system can achieve combined cold-heat power supply or heat and power cogeneration according to requirements of users. Regardless of operating in a cold-heat power supply mode or in a heat and power cogeneration mode, the combined cycle system only has a small part of external discharge heat loss and can make use of energy to the maximum extent.

The invention relates to a heat exchanger tube used for an evaporator, belonging to the technical field of heat exchange parts. The heat exchanger tube comprises a tube body and an external fin formed on the external wall surface of the tube body, wherein at least one side of the root of the external fin is provided with grooves which are used for retaining residue steam and is of small-scale hollow cavity structures at intervals. The heat exchanger tube provided by the invention has the advantages that the grooves with small-scale hollow cavity structures are formed on the side surface of at least one side of the root of the external fin at intervals, thus the grooves with small-scale hollow cavity structures are provided for a chamber with a large-scale hollow cavity structure in the existing technology so as to retain the residue steam which is used as the gasifying center for generating the next bubble, thereby improving the activity of the chamber with the large-scale hollow cavity structure and obviously improving the boiling heat transfer coefficient; and the weight of the tube body is reduced because the grooves with the small-scale hollow cavity structures are designed, which is in favor of saving materials and dose not cause the reduction of the strength of the tube body.

A high-hole-density through hole metal foam electronic element heat-exchanging device based on impact jet flow comprises a heat-exchanging substrate, through hole metal foam sintered on the heat-exchanging substrate, a cooling water inlet pipe and a water drainage pipe, wherein main bodies of the cooling water inlet pipe and the water drainage pipe are vertical arranged at intervals, heat-exchanging parts at the bottoms of the two water pipes are provided with the through hole metal foam, and a heat-exchanging structure is arranged in the position wherein the through hole metal foam is connected with the water drainage pipe. According to the high-hole-density through hole metal foam electronic element heat-dissipation device based on the impact jet flow, the through hole metal foam is used for separating the flowing route of supplement liquid and the escape route of bubbles, and largely reduces the resistance when the bubbles escape. The heat-exchanging device is high in heat-exchanging efficiency, and is capable of being widely used in the heat-exchanging field of electronic elements.

The invention relates to a novel carbonylation reactor for a process of producing glycol through synthesis gas. The reactor is a radial reactor and comprises a reactor shell, a heat exchange component, a flow dividing pipe, a flow collecting pipe and catalyst, wherein the flow dividing pipe is located in the center of the reactor; the heat exchange component is arranged between the flow dividing pipe and the flow collecting pipe; the heat exchange component is arranged in a catalyst bed layer, and the reactor shell comprises a cylinder, an upper seal head, a lower seal head, a reaction gas inlet, a reaction gas outlet, a cooling medium inlet, a cooling medium outlet, a catalyst unloading port and the like; the reaction gas inlet and the reaction gas outlet are arranged on the upper seal head; reaction gas enters the reactor from the reaction gas inlet, then flows downwards along the flow dividing pipe in the center, radially passes through the catalyst bed layer for reaction, and reaction product gas enters the flow collecting pipe, flows upwards along the flow collecting pipe and flows out from the reaction gas outlet. Compared with the prior art, the novel carbonylation reactor for the process of producing glycol through synthesis gas has the advantages of high heat exchange efficiency, small equipment size, high catalyst using efficiency and convenience in loading and unloading.

The invention discloses a reboiler which comprises a cylinder and a plurality of heat exchange tubes, wherein a material inlet and a material outlet are arranged at two ends of the cylinder respectively; a steam inlet is arranged on the cylinder on the side of the material outlet; and a condensate outlet is arranged on the cylinder on the side of the material inlet. According to the reboiler, a porous layer is processed on inner surfaces of heat exchange tube substrates and the porous layer has a heating surface with increased roughness so as to form an artificial evaporating core, so that the heat transfer efficiency of the heat exchange tubes is increased. Meanwhile, longitudinal grooves are processed on the outer surfaces of the heat exchange tube substrates, circular bulges are arranged in the longitudinal grooves, longitudinal nicks are arranged on a teeth part, the thickness of a liquid film is reduced by utilizing a surface tension and then the condensation effect on the exteriors of the heat exchange tubes is improved. According to the invention, the total coefficient of heat transfer of the reboiler is above 3 times of that of a light tube reboiler; anti-scaling capacity of boiling sides of the heat exchange tubes is increased; the dirt deposition rate is less than that of a smooth tube, so that the cleaning period of the reboiler is prolonged.

The invention discloses an internally-threaded evaporation heat exchange tube inlayed with a metal wire mesh on the inner surface. The internally-threaded evaporation heat exchange tube comprises a tube body provided with an inlet end and an outlet end, wherein a plurality of linear ribs peripherally distributed at intervals and extending in the axial direction of the tube body and linear channels formed among the linear ribs are arranged on the inner surface of the tube body, at least one layer of cylindrical metal wire mesh is arranged in the tube body, and the peripheral face of the metal wire mesh is in contact with the tops of the linear ribs to cover the linear channels, so that a channel separated from a central tube cavity of the tube body is formed between the metal wire mesh and the linear channels. The heat exchange efficiency of the threaded heat exchange tube can be further improved.

The invention relates to a waste heat recovery and power cooling combined supply system for a ship gas turbine, and belongs to the technical field of ships and energy conservation. The waste heat recovery and power cooling combined supply system for the ship gas turbine comprises an ORC liquid supply pump, an ORC steam generator, an ORC superheater, an ORC turbine, an ejector, a refrigeration evaporator, a condenser, a low-pressure liquid supply pump, a low-pressure preheater, a low-pressure steam generator, a low-pressure superheater, a steam pocket, a mixer, a regulating valve, a stop valveand a throttle valve. According to the system, temperature matching of heat exchange fluid and self-adaption of a high-temperature and low-temperature two-stage cycle working media are achieved by fully utilizing the characteristic of temperature change and phase change of a non-azeotropic mixed working media and the characteristic that the thermodynamic property difference of a vapor phase and aliquid phase is large during balance, the total irreversible loss of the system is reduced, and the total efficiency of composite cycle is improved.

The invention discloses foam metal with a mixed wet surface and a preparation method thereof. The foam metal comprises a super-hydrophilic surface (1) obtained through a chemical oxidization process and a foam meal surface locally covered by a super-hydrophilic film (2). The foam metal is characterized in that the super-hydrophilic surface (1) is provided with a micro-nano binary surface structure, wherein the main component of the super-hydrophilic film (2) is a high-molecular compound with a hydrophobic group. The foam metal is used in strengthening of boiling heat transfer, can improve boiling heat transfer property, and meets heat dissipation needs of high-integration electronic components and parts and heat exchange equipment with high heat exchange amount. The super-hydrophilic surface (1) in the foam metal has extremely strong lyophilic property, reduces gas bubble separating resistance, improves capillary liquid-absorbing ability, and obviously improves boiling heat transfer property; the super-hydrophilic film (2) which can be locally distributed can quicken a nucleation process of gas bubbles, a boiling start point is reduced, and boiling heat transfer property of foam metal is further strengthened.

The invention discloses an inner-thread evaporation heat exchange pipe with two sections of different spiral tooth-shaped structures. The inner-thread evaporation heat exchange pipe comprises a pipe body, wherein the inner surface of the pipe body is provided with a plurality of spiral racks with a certain spiral lead angle and a groove channel formed between the spiral racks; the pipe body is composed of a first heat exchange pipe section and a second heat exchange pipe section; and the spiral racks in the first heat exchange pipe section and the spiral racks of the second heat exchange pipe section have different rack quantities, different rack heights, different spiral lead angles and different spiral directions. The inner-thread evaporation heat exchange pipe is divided into two heat exchange sections in the same inner-thread heat exchange pipe along the flowing direction of a refrigerating agent; and each section of the spiral racks have the different rack quantities, different rack heights, different spiral lead angles and different spiral directions, so that the high-boiling heat exchange coefficient can be greatly improved and the heat exchange efficiency is improved.

The invention discloses a mixed wettability micro-nano composite enhanced heat exchange structure. The structure comprises a heat dissipation substrate, wherein a plurality of square micro-cylindricalarray units and groove channels arranged among the micro-cylindrical array units are etched on the heat dissipation substrate. Each micro-cylinder array unit comprises a plurality of micro-cylinderswhich are arranged in order, nanowires are arranged on the groove channels and the micro-cylinders, the diameter of the nanowires ranges from 200 nm to 500 nm, and the height of the nanowires ranges from 10 micrometers. The invention further discloses a manufacturing method of the mixed wettability micro-nano composite enhanced heat exchange structure. The micro-cylindrical array unit and the nanowire structure adopted by the invention can effectively enhance the boiling heat transfer coefficient of high heat flux and delay the boiling dry burning phenomenon.

A variable density metal foam radiator comprises a heat transfer substrate and through-hole metal foams of different sizes respectively sintered on the heat transfer substrate. The square through-holemetal foams are located in the middle part of the heat transfer substrate, and the annular through-hole metal foams are located in the outer periphery of the square through-hole metal foams and havesmaller pores. According to the invention, the through-hole metal foams with the smaller pores have larger capillary force, as a circulation way to supplement a liquid required for evaporation, the through-hole metal foams with the larger pores are more conducive to the escape of bubbles so that the through-hole metal foams can separate the circulation path of the supplement liquid from the bubbleescape path, the resistance encountered when the bubbles escape is greatly reduced, and thus the boiling heat transfer coefficient is increased. The maximum boiling heat transfer coefficient is 3 times more than that of a smooth copper plate. The boiling initial wall superheat degree is reduced to 2K. The special structure in the invention makes the temperature distribution of the heat transfer substrate more uniform and more suitable for the heat radiation of an electronic chip. Therefore, the heat transfer device of the invention has high heat transfer efficiency and can be widely used in the field of heat radiation of electronic devices.

The invention discloses a novel flooded type evaporating heat exchange tube. The novel flooded type evaporating heat exchange tube comprises a light section and an evaporating surface section, whereinthe evaporating surface section comprises a heat exchange tube body (8). The novel flooded type evaporating heat exchange tube is characterized in that inclined bent fins (2) which are spirally distributed along the axis of the heat exchange tube are arranged on the outer surface of the heat exchange tube body (8), wherein the surfaces of the fins (2) are in the shapes of curved surfaces, and thefins tilt in the same direction; the tops of adjacent fins (2) are in tight contact with each other without a seam, and the fins (2) cover a channel between the fins to define a triangular cavity (3); a trapezoidal notch (5) is formed in the top of each fin (2) as a steam discharge hole/liquid inlet of the cavity; and bulged ribs which are uniformly distributed in the peripheral direction are arranged on the inner surface of the heat exchange tube body (8), and a spiral channel is formed between every two adjacent ribs. The novel flooded type evaporating heat exchange tube is simple in processing, and is high in yield; and within a practical common wall surface superheat degree range, a heat exchange coefficient is slightly affected by the wall surface superheat degree, and is kept stable, so that variable working conditions of a heat exchanger are adapted.

The invention discloses a layered micro-nano composite structure for enhancing boiling heat transfer, and a processing method thereof. The layered micro-nano composite structure comprises a silicon substrate, a cylindrical microstructure grown on the silicon substrate and nano holes around the top surface of the cylindrical microstructure. The composite structure is based on the cylindrical microstructures arranged in an array mode, and the liquid supply speed of a heat flux density area can be effectively increased; and the nano holes generated on the periphery of the top surface of the cylindrical microstructure can effectively improve the vaporization core density, so that the boiling heat transfer coefficient is improved. The nano holes are only distributed around the top surface of the cylindrical microstructure, so that large-area transverse merging of bubbles in a high-heat-flux area at the bottom of the cylindrical microstructure is effectively prevented, heat transfer deterioration is effectively delayed, and it is ensured that the liquid supply capacity cannot be weakened due to introduction of the nano-structure. The layered micro-nano composite structure is machined and formed at a time through a dry corrosion method, accurate regulation and control of the micro-structure are achieved, and the machining method is easy to operate and low in manufacturing cost.

The invention discloses a method for machining a porous-surface heat-exchange pipe for boiling heat-transfer equipment, aiming at providing a heat-exchange pipe and a machining method with the advantages of simple process, convenience for machining, no falling of a machined porous surface and capability of machining various complex structural forms. The method comprises the steps of: cutting an aluminum alloy sheet according to developed dimensions of a base pipe and a porous layer of a heat-exchange pipe respectively to obtain aluminum alloy sheets which are respectively used for machining the base pipe and the porous layer and have the same dimensions as the developed dimensions of the base pipe and the porous layer of the heat-exchange pipe; respectively evening out; placing the evened-out aluminum alloy sheet for machining the porous layer in the middle of a terrace die and a hollowing die, and punching the aluminum alloy sheet for machining the porous layer by using the terrace die and the hollowing die; superposing and thermally pressing a porous layer substrate and the evened-out aluminum alloy sheet for machining the base pipe so that the porous layer substrate and the evened-out aluminum alloy sheet for machining the base pipe are integrated; and then, machining the evened-out aluminum alloy sheet for machining the base pipe into a pipe shape, and welding both the machined aluminum alloy sheets to obtain the aluminum alloy heat-exchange pipe with the porous surface.