35results about How to "Good heat transfer coefficient" patented technology

The invention discloses a heat-dissipation graphite powder mixed plastic material which comprises thermoplastic or thermosetting plastics. Heat-dissipation graphite powder, which accounts for 20-60 wt%, is uniformly mixed in the thermoplastic or thermosetting plastics. Since the heat-dissipation graphite powder is added into the plastic material disclosed by the invention, the particles of the graphite powder are orderly arranged to some extent to form microchannel carbon tubes, and each heat-dissipation channel is composed of a plurality of microchannels, thereby generating the chimney effect. When being installed on the surface of a heat source, the plastic material has favorable heat-dissipation performance. When being mixed in the plastic material, the graphite powder can modify the plastic material, so that the plastic material has favorable coefficient of heat transfer, and has the effects of shielding electromagnetic waves, blocking secondary radiation and the like.

The invention provides a heat exchange tube and a burner with a spiral flat tube self-preheating device. The heat exchange tube is a twisted spiral flat tube; the spiral flat tube comprises a spiral flat tube main body with a flatly tubular section and a spiral flat tube end connected with the spiral flat tube main body; and the section of the spiral flat tube end is round. The burner at least comprises a smoke chamber, and a heat exchange tube which is used for accommodating a gas to be preheated and arranged in the smoke chamber; and the heat exchange tube is the heat exchange tube provided by the invention. The invention is simple in operation, reliable and stable in running, and higher in heat exchange efficiency.

The invention relates to an anti-scaling and de-scaling heat exchanger for a fluidized bed. The anti-scaling and de-scaling heat exchanger is aimed at solving the technical problem in the prior art. Therefore, tube passes of a decarburized lye cooler of a synthetic ammonia device are not easily scaled. After long-term use, the heat exchange effect is still good. The anti-scaling and de-scaling heat exchanger is composed of a lower tube box 1, a heat exchanger tube array 2, an upper tube box 3, a liquid-solid separator 4, a descending tube 5, a solid particle groove 6, a liquid storage tank 7, a liquid circulating pump 8, a distribution box 9, a spherical plug 10, a baffle plate 11, a distribution disc 12, a distribution plate 13, slim tubes 14 and a lower-edge sleeve tube 15. An outlet of the distribution box 9 is connected with the slim tubes 14. The heat exchanger tube array 2 is connected with the upper tube box 3 connected with the liquid-solid separator 4. Solid phase enters the solid particle groove 6 through the descending tube 5. Liquid phase enters the liquid storage tank 7. The solid phase and liquid phase circulate to return the lower tube box 1. The anti-scaling and de-scaling heat exchanger for the fluidized bed has following beneficial effects: by adoption of the technical scheme, the above technical problem is solved; and the anti-scaling and de-scaling heat exchanger can be used for prolonging running cycle of the decarburized lye cooler of the synthetic ammonia device.

The invention relates to a liquid-solid circulating fluidized bed heat exchanger. According to the liquid-solid circulating fluidized bed heat exchanger, the technical problems that in the traditional technology, a propylene epoxide device saponification waste liquid heat exchanger tube side is prone to scaling and the heat exchanging effect is decreased obviously after a long period of using are solved. The liquid-solid circulating fluidized bed heat exchanger comprises a lower tube case 1, a heat exchanger tube nest 2, an upper tube case 3, a liquid-solid separator 4, a downcomer 5, a solid particle trough 6, a liquid storage trough 7, a liquid circulating pump 8, a distributing case 9, a distributing disk 10 and a distributing plate 11. The distributing case 9 is connected with the heat exchanger tube nest 2 through thin tubes 12. The heat exchanger tube nest 2 is connected with the upper tube case 3. The upper tube case 3 is connected with the liquid-solid separator 4. Solid particles enter the solid particle trough 6 through the downcomer 5 and then go back to the lower tube case 1. Liquid enters the liquid storage trough 7 and is delivered into the lower tube case 1 through the liquid circulating pump 8. According to the technical scheme of the liquid-solid circulating fluidized bed heat exchanger, the technical problems are well solved, and the liquid-solid circulating fluidized bed heat exchanger can be used for operation cycle prolonging of the propylene epoxide device saponification waste liquid heat exchanger.

A solar thermal receiver with concentric tube modules is disclosed. The outer two tubes (101, 102) of each module form an annular gap (104) for the inlet flow (109) of a heat transfer fluid (HTF). A third inner tube (103) allows for the outlet flow (108) of the HTF. Each of the concentric tube modules is bottom-supported so as to allow for thermal expansion. Embodiments may include a structural element (750) to mitigate oscillation of the concentric tube modules and/or a top-mounted bell-shaped cap (534).

The invention relates to an acrylic heat insulation coating with high reflectivity and a preparation method of the acrylic heat insulating coating. The acrylic heat insulation coating with high reflectivity is prepared from 20wt%-55wt% of acrylic resin, 10wt%-33wt% of titanium dioxide, 6wt%-12wt% of modified aluminum powder, 3.2wt%-7.6wt% of heat insulation functional filler, 9wt%-17wt% of a mixedsolvent and the balance of aids, wherein the modified aluminum powder is flaky aluminum powder with the surface coated with titanium dioxide. Acrylic resin is used as a film forming substance, the high-reflectivity flaky aluminum powder with surface coated with titanium dioxide, titanium dioxide and the heat insulation functional filler with good heat insulation performance and very low heat transfer coefficient are added, so that the heat reflecting coating has the characteristic of integration of solar ray reflection, infrared light wave radiation and heat conduction barrier and has very good heat insulation and cooling effects.

The invention relates to a self-cleaning fluidized bed heat exchanger which is mainly used for solving the technical problems that in the prior art, the tube pass of a decarburization alkaline liquorcooler of an ammonia synthesizing device is prone to scaling, and the heat exchange effect is obviously decreased after long-period use. The self-cleaning fluidized bed heat exchanger comprises a lower tube box 1, a heat exchanger tube nest 2, an upper tube box 3, a liquid-solid separator 4, a particle filtering plate 5, a liquid storing tank 6, a liquid circulating pump 7, a downcomer 8, a spraynozzle 9, a horizontal pipe 10 and an expanding port 11, wherein the expanding port 11 is installed in the lower tube box 1, the upper tube box 3 is connected with the liquid-solid separator 4, solidparticles enter the spray nozzle 9 through the downcomer 8, and a liquid phase overflows from the upper portion of the particle filtering plate 5, enters the liquid storing tank 6 and circulates to the spray nozzle 9 through the liquid circulating pump 7. According to the technical scheme, the technical problems are well solved, and the self-cleaning fluidized bed heat exchanger can be used for prolonging the running cycle of the decarburization alkaline liquor cooler of the ammonia synthesizing device.

The invention relates to an outer circulating fluidized bed heat exchanger. The outer circulating fluidized bed heat exchanger is mainly used for solving the technical problem that the tube pass of a reformed hydrogenation unit reaction effluent/mixed feeding heat exchanger is easy to scale in the prior art, and thus the heat exchange effect can be lowered obviously after long-period use. The outer circulating fluidized bed heat exchanger comprises a lower tube box 1, heat exchanger tube nests 2, an upper tube box 3, a solid-liquid separator 4, a down pipe 5, a solid particle groove 6, a liquid storage tank 7, a liquid circulating pump 8, lower edge sleeves 9, a distribution plate 10, a baffle 11 and a horn pipe. The heat exchanger tube nests 2 are connected with the upper tube box 3, and the upper tube box 3 is connected with the solid-liquid separator 4. Solid particles enter the solid particle groove 6 through the down pipe 5 and then return to the lower tube box 1. Liquid enters the liquid storage tank 7 and then is pumped to the lower tube box 1 through the liquid circulating pump 8. By the adoption of the technical scheme, the technical problem is well solved, and the outer circulating fluidized bed heat exchanger can be used for prolonging the operation cycle of the reformed hydrogenation unit reaction effluent/mixed feeding heat exchanger.

The invention discloses a heat exchanger with net type lung-shaped heat exchange plates. The heat exchanger with the net type lung-shaped heat exchange plates comprises net type heat exchanger plates, a heat exchanger shell, a liquid inlet tube and a liquid outlet tube, wherein the net type heat exchanger plates are distributed in the heat exchanger shell from top to bottom at equal intervals to form a lung-shaped hollow structure; the liquid inlet tube and the liquid outlet tube are respectively arranged on the heat exchanger shell in the longitudinal direction; and according to each net type heat exchanger plate, two plate bodies with through holes are superposed vertically, the peripheries of the plate bodies and side seams of the through holes are welded together in an argon arc welding or laser welding mode, and a fluid channel in each plate is formed. By the heat exchanger with the net type lung-shaped heat exchange plates, fluid flowing resistance of the outside of each plate is reduced, meanwhile, large Reynolds number can be obtained at low speed, turbulent flow is formed, heat exchange coefficient is increased effectively, therefore, the heat exchanger is simple, efficient and energy-saving, and is compact in structure, occupied space and initial investment are saved, the resistance of the product is lower than that of a traditional plate type heat exchanger, and the heat exchange coefficient can be high.

The invention provides a medical injection water preparation system and a control method thereof. The medical injection water preparation system comprises a preparation unit and a control unit, wherein the preparation unit is used for preparing medical injection water; the control unit is arranged in the preparation unit and used for controlling and adjusting the preparation unit in the working process, so that in the medical injection water preparation system, the pressure of a steam generator is kept at 0.4-0.8 MPa, and the liquid level is kept at 5-35 cm; steam ejected from a steam outlet of a steam ejector is maintained to be saturated steam with a temperature of 112-125 DEG C; the temperature drop between two adjacent falling film evaporators is kept at 3-5 DEG C; and the water production ratio of qualified product water of the medical injection water preparation system is not less than 8. The system has the beneficial effects that the overheating phenomenon existing after pure water steam and supplementary steam are mixed is overcome, and the problem that the heat efficiency of the first-effect evaporator is insufficient due to elimination of the steam superheat degree is solved; and possible pipe emptying, pipe submerging and other bad working conditions in the system are eliminated, and high operation stability and ideal water production efficiency of the injection water preparation system are guaranteed.

The invention discloses an insulation board which is prepared from the following raw materials in parts by weight: 25 to 33 parts of slag powder, 20 to 28 parts of sawdust, 18 to 26 parts of straw fiber, 10 to 18 parts of adhesive, 15 to 23 parts of polystyrene resin, 22 to 30 parts of foaming agent, 8 to 16 parts of antioxidant, 5 to 13 parts of stabilizer, 1 to 5 parts of fire retardant and 5 to 13 parts of catalyst. Further, the insulation board comprises the following raw materials in parts by weight: 25 parts of slag powder, 20 parts of sawdust, 18 parts of straw fibers, 10 parts of an adhesive, 15 parts of polystyrene resin, 22 parts of a foaming agent, 8 parts of an antioxidant, 5 parts of a stabilizer, 1 part of a fireproof agent and 5 parts of a catalyst. The prepared heat insulation board is good in heat transfer coefficient, fireproof performance, specific gravity, compressive strength and breaking strength and has low heat conductivity so that better heat insulation performance is guaranteed, and the insulation board has excellent toughness and rigidity.

An electrohydraulic actuating device (10), having an electric motor (1) and having a pump (2) driven by said electric motor, for the operation of a hydraulic control cylinder (8) of a hydraulic unit (3), wherein the motor (1) and the hydraulic unit (3) are each accommodated in a housing part (21, 22) of a housing (20), and wherein the housing (20) is equipped, at least in sections, with outwardlypointing cooling fins (4), wherein the housing (20) has a cuboidal or rectangular cross-sectional shape with substantially straight wall sections (23) situated at least on two opposite sides, which wall sections are formed with planar depressions or cutouts (24) which are continuous in the longitudinal direction, and the cooling fins (4) are provided at least partially in the form of removable plate-like cooling modules (5) which, for the insertion and installation thereof, are adapted in terms of shape and depth to the depressions or cutouts (24) of the housing (20).

The invention discloses a concrete bundle superimposed thermal insulation material, which comprises the following raw materials in parts by weight: 20-40% of slag, 20-40% of fly ash, 20-40% of biomassash, 12-19% of saw dust, 3-13% of old clothes fibers, 13-40% of cement, 5-15% of lightweight aggregate and 0.2-0.5% of an additive, and is composed of an inner wall plate, an outer wall plate, a thermal insulation partition plate, an air beam, a trough plate, an installation corner, a bundle end plug and concrete, wherein the surface of the air bundle is a rough surface, and the thermal insulation partition plate is installed between the inner wall plate and the outer wall plate. According to the invention, air beams are arranged in a multilayer staggered manner, so that the thermal bridge length is increased and the thermal resistance is increased so as to increase the thermal resistance of the thermal insulation building material and reduce the heat transfer coefficient of the thermal insulation building material; and the produced thermal insulation building material is high in strength through a special formula, the A-grade fireproof smokeless non-toxic effect is achieved through inorganic materials, and the environmentally-friendly building material is manufactured through industrial solid waste, old clothes fibers and other resources and is economical and environmentally friendly.