Baffle structure improving heat transfer efficiency of reactor or heat exchanger

Abstract
Disclosed is a shell-and-tube reactor or heat exchanger, which alternately comprises a doughnut-type baffle plate and a first disc-type baffle plate in order to increase heat transfer efficiency. In the reactor or heat exchanger, a second disc-type baffle plate is placed in an empty space inside of the doughnut-type baffle plate, and some tubes, through the inside of which a first object for heat transfer with a heat transfer medium, are present in a region inside of the doughnut-type baffle plate and outside of the second disc-type baffle plate. Also disclosed is a method for producing an oxide, comprising: using said reactor or heat exchanger, and causing a catalytic vapor-phase oxidation reaction in the tubes, through the inside of which the first object for heat transfer with the heat transfer medium is passed.
Description

BRIEF DESCRIPTION OF THE DRAWINGS


FIG. 1 is a cross-sectional view schematically showing the structure of a prior general shell-and-tube catalytic reactor or heat exchanger.



FIG. 2 is a cross-sectional view schematically showing the structure of a reactor or heat exchanger according to the present invention, in which a disc-type baffle plate having a given diameter is placed inside of a doughnut-type baffle plate in order to improve heat transfer efficiency.



FIG. 3 is a cross-sectional view taken along line X-X′ in FIG. 2, which shows the cross section of a reactor or heat exchanger according to an embodiment of the present invention, in which the disc-type baffle plate is placed inside of the doughnut-type baffle plate, and illustrates a reaction tube region, the size of a doughnut-type baffle plate and the size of a disc-type baffle plate placed inside of the doughnut-type baffle plate.



FIG. 4 is a graphic diagram showing the distribution of heat transfer coefficient in a reactor manufactured in each of Comparative Example 1 and Example 1.



FIG. 5 is a graphic diagram showing the internal temperature distribution of reaction tubes in a reactor manufactured in each of Comparative Example 1 and Example 1.


Claims
  • 1. A shell-and-tube reactor or heat exchanger alternately comprising a doughnut-type baffle plate and a first disc-type baffle plate, wherein a second disc-type baffle plate is placed in an empty space inside of the doughnut-type baffle plate, and tubes, through the inside of which a first object for heat transfer with a heat transfer medium is passed, are present in a region inside of the doughnut-type baffle plate and outside of the second disc-type baffle plate.
  • 2. The shell-and-tube reactor or heat exchanger of claim 1, wherein the diameter D1 of the second disc-type baffle plate is in a range of 5-25% of the inner diameter D4 of the shell of the reactor or heat exchanger.
  • 3. The shell-and-tube reactor or heat exchanger of claim 1, wherein the inside diameter D3 of the doughnut-type baffle plate is in a range of 20-50% of the inner diameter D4 of the shell of the reactor or heat exchanger.
  • 4. The shell-and-tube reactor or heat exchanger of claim 1, wherein the inside diameter D2 of the region, in which the tubes are present, is adjusted such that the distance from the second disc-type baffle plate, i.e., (D2−D1)/2, wherein D1 is the diameter of the second disc-type baffle plate, is in a range of 0.5-10% of the inner diameter D4 of the shell of the reactor or heat exchanger, and the distance from the doughnut-type baffle plate, i.e., (D3−D2)/2, wherein D3 is the inside diameter of the doughnut-type baffle plate, is in a range of 3-20% of D4.
  • 5. The shell-and-tube reactor or heat exchanger of claim 1, wherein the first object for heat transfer with the heat transfer medium is a reactant(s) before chemical or physical reaction, a product(s) after the reaction, or a mixture thereof.
  • 6. A method for producing an oxide, comprising: using a shell-and-tube reactor or heat exchanger set forth in claim 1, which alternately comprises a doughnut-type baffle plate and a first disc-type baffle plate, wherein a second disc-type baffle plate is placed in an empty space inside of the doughnut-type baffle plate, and tubes, through the inside of which a first object for heat transfer with a heat transfer medium is passed, are present in a region inside of the doughnut-type baffle plate and outside of the second disc-type baffle plate; andcausing a catalytic vapor-phase oxidation reaction in tubes.
  • 7. The method of claim 6, wherein the oxide is unsaturated aldehyde or unsaturated fatty acid.
  • 8. The method of claim 6, wherein the diameter D1 of the second disc-type baffle plate is in a range of 5-25% of the inner diameter D4 of the shell of the reactor or heat exchanger.
  • 9. The method of claim 6, wherein the inside diameter D3 of the doughnut-type baffle plate is in a range of 20-50% of the inner diameter D4 of the shell of the reactor or heat exchanger.
  • 10. The method of claim 6, wherein the inside diameter D2 of the region, in which the tubes are present, is adjusted such that the distance from the second disc-type baffle plate, i.e., (D2−D1)/2, wherein D1 is the diameter of the second disc-type baffle plate, is in a range of 0.5-10% of the inner diameter D4 of the shell of the reactor or heat exchanger, and the distance from the doughnut-type baffle plate, i.e., (D3−D2)/2, wherein D3 is the inside diameter of the doughnut-type baffle plate, is in a range of 3-20% of D4.
  • 11. A method for increasing the heat transfer coefficient of tubes in a shell-and-tube reactor or heat exchanger alternately comprising a doughnut-type baffle plate and a first disc-type baffle plate, in which the tubes are provided in a region inside of the doughnut-type baffle plate, the region having present therein a flow of heat transfer medium parallel to the axis of the tubes (parallel flow), and in which a first object for heat transfer with the heat transfer medium is passed through the inside of the tubes, the method comprising placing a second disc-type baffle plate in said region to increase the flow rate of the parallel flow.
Priority Claims (1)
Number Date Country Kind
2006-9405 Jan 2006 KR national