98results about How to "Improve overall heat transfer coefficient" patented technology

The invention relates to a spiral plate fixed bed reactor for gas-solid phase contact catalytic reaction, comprising inlets and outlets of a gas phase and a heat exchange medium. The reactor has a plurality of spiral plate fixed bed reaction sections inside. Each spiral plate fixed bed reaction section consists of two spiral passages formed by rolling two parallel metal sheets, wherein one of thepassages has two axial ends which are not sealed, and is filled with a catalyst to form a fixed bed layer, with the upper end (or lower end) of the bed layer being communicated with the gas inlet, andthe lower end (or the upper end) being communicated with the gas outlet; gas enters the reactor through the inlet, passes through the catalyst fixed bed layers axially section by section and is reacted and then is discharged from the gas outlet; the other passage has sealed axial two ends and is adopted as a heat exchange medium passage; the heat exchange medium flows through the spiral passage and exchanges heat through the plate wall, and is discharged out of the reactor though the heat exchange medium outlet after heat exchange is finished. The reactor has a significantly increased shell-side heat exchange coefficient, so that the total heat transfer coefficient is increased, the heat transfer effect is enhanced, and the heat transfer temperature difference is reduced.

The present invention relates to an apparatus for recovering re-evaporated steam and condensate, and in particular, to an apparatus for mixing the steam re-evaporated from condensate that is discharged from a heating unit for heating an object to be treated, with high-temperature steam supplied from a boiler, and for resupplying the mixed steam to the heating unit. To this end, the apparatus comprises: a steam recovery unit for recovering the condensate discharged from a heating unit for heating an object to be treated, and the steam re-evaporated from the condensate, and then supplying the recovered re-evaporated steam to a steam pressurizing unit and the recovered condensate to a boiler; and the steam pressurizing for mixing the re-evaporated steam supplied from the steam recovery unit, with high-temperature steam supplied from the boiler and then supplying the mixed steam to the heating unit. Therefore, with a closed circuit, the apparatus can recover the whole quantity of the re-evaporated steam and condensate for use, prevent the release of steam into the air and utilize a latent heat contained in the condensate, thereby improving the efficiency of energy consumption.

The invention relates to a heat exchange tube with two reinforced surfaces. The heat exchange tube comprises a sawteeth-shaped low-fin outer surface layer and an inner surface metal porous layer, wherein the low-fin outer surface layer is integrated with the tube wall. Compared with the prior art, the heat exchange tube strengthens the condensation of steam at the outside of the tube and the evaporation of liquid in the tube simultaneously; the surfaces of sawteeth-shaped fins of the outside of the tube are rough, and the sawteeth are mutually staggered, thus disturbing the flowing state of fluid; the surface tension is utilized to thin a liquid film on the fins so as to strengthen the condensation and heat transfer; and the number of vaporized cores is added on the porous layer at the inner surface of the tube, thus reducing the superheat degree needed by vaporization, strengthening the heat transfer of boiling, and improving the heat transfer of boiling by 10-15 times.

The invention relates to a reactor process control method of an HPPO (hydrogen peroxide to propylene oxide) device and mainly solves the problems that a heat transfer effect is poor, the reaction temperature is not uniform and the temperature in a reactor is difficult to control in the prior art. By means of the reactor process control method of the HPPO device, four serially connected corrugated plate reactors are adopted, circular cooling water is forced to circulate to optimize heat removing, and the temperature of the circular cooling water is controlled through a thermometer and an adjusting valve, so that the reaction temperature is uniform. Accordingly, by means of the technical scheme that the total heat transfer coefficient K is increased to 2,400-2,800 w / m<2>k, the service life of a catalyst is prolonged to 4.8-5.0 years and the selectivity of epoxypropane is improved to 97.2%-97.3%, the problems are better solved, and the reactor process control method can be used in the HPPO device.

The invention discloses an integrated combined heat exchanger. The integrated combined heat exchanger comprises a tube box, a shell and a U-shaped heat exchange tube bundle. The tube box is divided bytube pass partition plates into four tube passes, and a tube winding tube bundle is arranged. The shell is connected with the rear end of the tube box through a tube plate, and a tube pass dividing partition plate with the length smaller than the length of the shell is transversely arranged in the shell. The U-shaped heat exchange tube bundle comprises overheating section tube bundles and evaporation section tube bundles, all of which are arranged in an overheating section area and an evaporation section area in a one-to-one correspondence manner, the total length of the evaporation section tube bundles is equal to the length of the tube pass dividing partition plate, and the length of straight tube sections of the overheating section tube bundles is equal to the length of the tube pass dividing partition plate. The vertical distance between a row of tube bundles on the tops of the evaporation section tube bundles and the tube pass dividing partition plate is not smaller than 125 mm,at least one row of heat exchange tubes in the evaporation section tube bundles are higher than the liquid level in the shell, and the vertical distance between the row of heat exchange tubes and thenext row of heat exchange tubes is larger than the normal tube distance of the evaporation section tube bundles. The heat exchanger can be used for multiple occasions, and the utilization rate and heat transfer efficiency are improved.