CN2844832Y

CN2844832Y - Non-equidistant spiral baffle heat exchanger

Info

Publication number: CN2844832Y
Application number: CN 200520093065
Authority: CN
Inventors: 孙雅忠; 李德君; 郭占利; 陈保东
Original assignee: ZHONGYOU FUSHUN ENGINEERING CONSTRUCTION Co Ltd; Liaoning Shihua University
Current assignee: ZHONGYOU FUSHUN ENGINEERING CONSTRUCTION Co Ltd; Liaoning Shihua University
Priority date: 2005-10-28
Filing date: 2005-10-28
Publication date: 2006-12-06
Anticipated expiration: 2015-10-28

Abstract

The utility model discloses a kind of non-equidistant spiral baffle heat exchanger, be made up of tube sheet, helical baffles, pull bar, distance sink tube, heat exchanger tube and housing, tube sheet is positioned at two ends, and pull bar, heat exchanger tube pass deflection plate.Be with distance sink tube on the pull bar, distance sink tube is between corresponding two bafflings are pulled in a pitch.A plurality of deflection plates equidistant placement not between two tube sheets.The utility model satisfies the needs of condensation (evaporation) device different volumes flow rate by the different spacing of appropriate design deflection plate.Thereby the raising heat-transfer capability reduces flow pressure drop, and the destruction that also can avoid evaporation process to cause heat-transfer equipment is guaranteed the highly effective and safe operation of equipment.The heat-transfer capability that can make the utility model improves more than 10%, and the pressure that reduces the condenser fluid falls more than 10%.Under same process conditions, the manufacturing cost of heat exchanger does not improve.

Description

Non-equidistant spiral baffle heat exchanger

One, technical field

The utility model belongs to technical field of heat exchange, is specifically related to a kind of spiral baffle heat exchanger.

Two, background technology

Condensation (evaporation) device is important, the common apparatus in oil plant, chemical plant.The condensation process of condenser is divided into dropwise condensation and film condensation.The heat transfer rate of dropwise condensation than the big 4-8 of film condensation is doubly wanting big 15-20 doubly in some cases.Though the heat-transfer effect of dropwise condensation is fine, unstable in operation, therefore, industrial condensation process great majority belong to the film condensation operating mode.In condensation process, the molecule in the steam is approaching to the liquid film of tube wall by diffusion, and the latent heat that steam discharges passes toward tube wall by liquid film.The research of condensation rule in the condenser, the computational methods that adopt Nu Xieerte to propose usually.On the shell-side structure of condenser, adopt bow type baffle arrangement usually, bow type baffle arrangement can be divided into single arc and bouble-bow shape structure again.Owing to there are reasons such as flow dead, pressure drop be bigger in segmental baffle, developed condensation, the heat transmission equipment that rod baffle replaces deflection plate at the beginning of the eighties at the end of the seventies in last century, that rod baffle has solved preferably is cold, bigger problem falls in exchange device shell-side fluid pressure.The beginning of the nineties at the end of the eighties, carried out the research of helical baffles condensation, heat transmission equipment, be characterized in solving segmental baffle board heat exchangers flow dead and the big technical problem of flow resistance.No matter above-mentioned condensation, DESIGN OF NON ADIABATIC are segmental baffles, or rod baffle, cold, the exchange device of helical baffles, all are being equidistant placement aspect the baffling spacing.These equidistant placement structures make that the condenser under the existing structure can not be given full play to its heat-transfer capability, have also increased the flow resistance of fluid.When cooling medium flows in condenser, the volume flow rate of fluid is that the carrying out along with condensation process reduces gradually, and equidistant helical baffles condenser is not just considered the variation of the volume flow rate of fluid, thereby the heat-transfer capability that causes condenser can not get fully playing, increase falls in the condensing pressure of fluid, even causes the structural deterioration of some steam generation.

Three, summary of the invention

The purpose of this utility model provides a kind of non-equidistant spiral baffle heat exchanger, it can further improve the exchange capability of heat of fluid in condenser, evaporimeter, the pressure that reduces condensation, evaporation process falls, the destruction of avoiding evaporation process to cause heat-transfer equipment is guaranteed the highly effective and safe operation of equipment.

Non-equidistant spiral baffle heat exchanger is made up of tube sheet, helical baffles, pull bar, distance sink tube, heat exchanger tube and housing.Tube sheet is positioned at two ends, and pull bar, heat exchanger tube pass deflection plate, and the heat exchanger tube two ends pass from the pore on the tube sheet of both sides, terminal and tube sheet welding.Pull bar one end and a side pipe plate be by being threaded, and uses nut check after having screw thread to pass last piece deflection plate on the other end.Be with distance sink tube on the pull bar, distance sink tube plays fixedly deflection plate between corresponding two bafflings are pulled in a pitch.A plurality of deflection plates equidistant placement not between two tube sheets, and be that the flow direction according to shell-side fluid increases (condenser) successively or reduces (evaporimeter) successively.Because baffle(s) spacing does not wait, so the distance sink tube size is also inequality.

The utility model satisfies the needs of condensation (evaporation) device different volumes flow rate by the different spacing of appropriate design deflection plate.Thereby the raising heat-transfer capability reduces flow pressure drop, and the destruction that also can avoid evaporation process to cause heat-transfer equipment is guaranteed the highly effective and safe operation of equipment.The heat-transfer capability that can make the utility model improves more than 10%, and the pressure that reduces the condenser fluid falls more than 10%.Under same process conditions, the manufacturing cost of condenser does not improve.

Four, description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is non-equidistant spiral baffle heat exchanger baffling schematic diagram.

Five, the specific embodiment

Non-equidistant spiral baffle heat exchanger is made up of tube sheet 1, helical baffles 3, pull bar, distance sink tube 2, heat exchanger tube 4 and housing.On arrangement of baffles, take the closely spaced structure in spacing large outlet place, fluid intake place for condenser, evaporimeter is taked the big structure of the fluid intake place little exit of spacing spacing, adapted to the variation of fluid volume flow rate, make the heat-transfer capability of condenser or evaporimeter obtain fully playing, condenser is by the flow direction of shell-side fluid, and adjacent helical baffles spacing increases successively, and helical angle increases successively and is: 6 °, 8 °, 12 °, 18 °, 20 °, 25 °, 30 °, 40 °; Evaporimeter is by the flow direction of shell-side fluid, and adjacent helical baffles spacing reduces successively, and helical angle is reduced to successively: 40 °, 30 °, 25 °, 20 °, 18 °, 12 °, 8 °, 6 °.Because helical baffles has certain spiral angle, and non-ly equidistantly cause every adjacent two deflection plate spiral angles all inequality, so the manufacturing of helical baffles and the big difficult point that the equidistant spiral baffle heat exchanger of right and wrong is made is installed.Embodiment adopts faces the mode that replaces curved surface directly, is exactly specifically every deflection plate to be pressed spiral angle equidistantly do not arrange, and the interior projection of four deflection plates on the tube bank cross section of pitch is combined into a complete circle.Because deflection plate has certain angle with the tube bank axis, and along with the pitch different angles are also different, processes pore so should make special mold.After deflection plate machines, two kinds of method assembling tube banks are arranged.A kind of is to wear heat exchanger tube again after earlier pull bar, distance sink tube, deflection plate being installed; Another kind is after wearing heat exchanger tube earlier deflection plate to be installed.Which kind of method all will be adjusted the angle of deflection plate and tube bank axis, avoids assembling by force and causes heat exchanger tube recessed flat or situation about scratching to occur.

Claims

1, a kind of non-equidistant spiral baffle heat exchanger, by tube sheet (1), helical baffles (3), pull bar, distance sink tube (2), heat exchanger tube (4) and housing are formed, tube sheet (1) is positioned at two ends, pull bar, heat exchanger tube (4) passes deflection plate, heat exchanger tube (4) two ends pass from the pore on the tube sheet of both sides, terminal and tube sheet (1) welds, pull bar one end and a side pipe plate are by being threaded, use nut check after having screw thread to pass last piece deflection plate on the other end, be with distance sink tube (2) on the pull bar, distance sink tube (2) is positioned at corresponding two bafflings of pitch to be pulled between (3), it is characterized in that: a plurality of deflection plates (3) equidistant placement not between two tube sheets (1).

2, non-equidistant spiral baffle heat exchanger according to claim 1 is characterized in that: by the flow direction of shell-side fluid, helical baffles (3) spacing increases successively.

3, non-equidistant spiral baffle heat exchanger according to claim 1 is characterized in that: by the flow direction of shell-side fluid, helical baffles (3) spacing reduces successively.